KR20070084229A - Blow Molding Equipment and Blow Molding Method - Google Patents

Abstract

The mold clamping device of the blow molding apparatus includes a retraction mechanism 20 for closely separating the bases 21 and 22 that support a pair of mold halves, respectively, and a first stop provided on both sides of one base. The second fastening member 52 which engages and disengages the member 51 and the 1st locking member 51 provided in the both sides of the other base, and these locking members are closely separated from each other, Both locking members engaged at the time of closing were provided with a mold clamping drive mechanism 40 which is pulled and driven in a direction in which the pair of divided molds are clamped. Since the retaining members 51 and 52 are tensioned by engaging the fastening members 51 and 52, the fastening operation of the molding die and the high mold clamping force can be exhibited, and the mold clamping can be reliably performed.

Description

Blow Molding Apparatus and Blow Molding Method {BLOW MOLDING APPARATUS AND BLOW MOLDING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding apparatus and a blow molding method having a mold clamping device for expressing a high speed opening and closing operation of a mold and a high mold clamping force to ensure mold tightening.

In general, the blow molding apparatus introduces and inserts a cylindrical flyson made of thermoplastic resin melted and ejected from a crosshead die of an extruder into a molding die, and inserts an air suction nozzle installed in the compressed air suction device into the flyson. The air is sucked through the air suction nozzle to form a hollow molded article by means of a cavity in which the flyson is engraved on the inner surface of the molding die, and the molding die is provided with a mold clamping device for closing the mold, opening the mold, and tightening the mold. have.

As what provided the mold clamping apparatus which exhibits a high mold clamping force in the conventional blow molding machine, what is described in the following patent documents 1 and 2 is proposed, for example.

As described in Patent Literature 1, the slide base 330 to which the guide rail 331 fixedly attached to the base 301 is attached, and the guide rail 331 are slidably provided as shown in FIG. The movable table 332, three tie bars 333, 334, 335 inserted into the movable table, the front platen support plate 336 and the rear support plate 337 fixed to the tie bars, and sliding to the tie bar. It is connected to the slide collars 342, 343, 346, and 347 inserted as possible, and the pair of platens 340 and 345 in which the molding dies 341 and 344 are provided, and the pair of platens 340, A holding mechanism 352 of the parting line PL for moving the 345 at equidistant distances, and a mold tightening drive mechanism 356 for operating the mold closing, holding pressure, and opening of the mold to face each other. And a type tightening generating mechanism 362.

The parting line retaining mechanism 352 is provided with a pair of racks 349 and 350 via a support on each of the slide collars 342, 343, 346 and 347 of the front platen 340 and the rear platen 345. The pair of racks 349 and 350 extend in the horizontal direction and are configured to engage with the pinion 351 which is axially rotatably supported by the movable table 332, respectively.

The type tightening drive mechanism 356 is a toggle link mechanism for converting rotational motion into linear linkage, and is connected between the rear platen 345 and the rear support plate 337 and connected to the drive shaft 358. A disk 355 which is rotated by an electric motor (not shown) and is connected to the slide collars 359 and 360 which are inserted in the tie bars 333 and 334 so as to be movable in the horizontal direction. It is comprised by the slide block 357 which consists of a pair of link arms 354 and 361 rotatably connected to each other in radial direction.

The mold tightening generating mechanism 362 connects the shaft 365 to the other end of the link arm 361 via the bracket 364 so as to be slidable in the same direction as the mold opening and the mold closing of the molding die. 365 is axially movable in the cylinder 366 provided at the upper end of the rear support plate 337, and in the cylinder 366 a plurality of plate springs 367 passing through the shaft 365 are inserted. It is arrange | positioned and stored so that a concave surface may face each other so that compression is possible.

As described in Patent Document 2, as illustrated in FIG. 23, the rods 419a and 419b provided on the movable table 430, the movable plate 418 and the connecting body 421 fixed to the rods 419a and 419b are provided. , A first mold holder 410 inserted into the rods 419a and 419b, a second mold holder 417 mounted to the connecting body 421, and a material mounted to the first mold holder 410. A toggle mechanism for causing the mold closing, holding, and opening operation of the second mold part 403 attached to the first mold part 402 and the second mold holder 417 and the pair of mold parts facing each other ( 409) and mold clamping force changing device 420, and the like. 406 in FIG. 23 is parison.

The toggle mechanism 409 is a mechanism for converting the toggle piece from a curved line to a straight line, interposed and connected between the first mold holder 410 and the moving plate 418. The toggle mechanism 409 And a pair of first and second toggle pieces 407 and 408 can be freely coupled to each other, and the pair of first and second toggle pieces 407 and 408 can be freely coupled to each other by the support shaft 411. The second toggle piece 408 is freely pinned to the movable plate 418 via the second bracket 408a.

The guide block 412 fixed to the support shaft 411 is vertically guided by a pair of center positioning guide bars (not shown) fixed to the support portion 431 of the movable table 430. The pair of toggle pieces 407 and 408 can be moved in a bent or straight shape to mold open the mold 401 in the bent shape, and the mold 401 can be closed in the extended straight shape. That is, the feed screw 416 by rotating the feed screw 416 such as a ball screw forward / backward from the electric motor 415 which is fixedly mounted on the movable table 430 via the coupling 415a. Guide block 412 screwed to the reciprocating motion in the direction of the center axis of the guide bar.

The mold clamping force changing device 420 is indirectly connected to the second mold part 403 via the rods 419a and 419b, the connecting body 421 and the second mold holding body 417, and the toggle mechanism 409 is provided. And between the molds 401. The mold clamping force change device 420 shows a guide member 440 fixedly installed on the moving plate 418 moving integrally with the second mold portion 403 and an illustration fixedly mounted on the second bracket 408a. An electric motor 444 composed of an omitted adjusting screw member, a worm and a worm wheel, and a servo motor capable of forward / reverse driving.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 7-32366

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2004-106284

Patent Documents 1 and 2 describe a method of closing a mold and opening a mold and generating a clamping force with a single toggle mechanism, and converting a rotational movement into a linear movement or a bending movement into a linear movement. Therefore, it was not possible to open and close the molding die at high speed. In addition, there is a concern that the mold clamping force of the molding die is easily deformed to the platen from the positional relationship between the support point of the mold clamping force and the stationary point of the mold clamping force, and is difficult to transfer directly to the mold.

The present invention is to solve the problems of the conventional blow molding apparatus, a blow molding apparatus having a mold clamping device that can perform a mold tightening by expressing a high-speed opening and closing operation and a high mold clamping force of the molding die And it is an object to provide a blow molding method.

In order to achieve the above object, the present invention provides a mold clamping apparatus in a blow molding apparatus that performs mold opening, mold closing, and mold tightening of a pair of mold halves forming a mold. With respect to the retreat mechanism which closely separates the base which supports each, the 1st locking member provided in the both sides of one base of the pair of bases, and the said 1st locking member installed in the both sides of the other base, and corresponding, respectively. The first locking member and the second locking member which are engaged with each other when the second locking member and the first locking member and the second locking member which are engaged with each other and the second locking member close to each other are closed. It is a blow molding apparatus provided with the mold | die clamping drive mechanism which tensions and drives a member to the direction which mold-molds a said pair of divided molds.

Moreover, a 2nd subject solving means sets it as the structure which the said type clamping apparatus is equipped with the mechanism which drives the engagement and separation of the said 1st locking member and the said 2nd locking member.

In addition, in the third problem solving means, the engaging and separating driving mechanism pivotally supports one of the locking members of the first locking member and the second locking member so that the first locking member and the second locking mechanism are supported. The support member which moves forward and backward in synchronization with the operation of the said type tightening drive mechanism with respect to the other stop member of a stop member, and said one stop member is attached to the said other stop member according to the advance movement of the said support body. It is set as the structure provided with the guide body which engages with respect to and guides in the direction to which it carries.

The fourth problem solving means includes a structure in which the engagement / release drive mechanism includes a cylinder, and synchronizes with the advance and retreat of the cylinder shaft of the cylinder to engage / separate the first engagement member and the second engagement member. I did it.

The 5th problem solving means is set as the structure which the said retraction mechanism is equipped with the left-right reverse lead feed screw which mutually closes and couples said pair of divided types, and the electric motor which rotates the left-right reverse lead feed screw rotationally. As the electric motor, a servo motor is preferable in view of ease of control.

The sixth problem solving means has a configuration in which the mold tightening drive mechanism includes a transfer screw for closely separating the first stop member and the second stop member, and a motor for rotationally driving the transfer screw. The motor is preferably a servo motor in view of ease of control.

The 7th problem solving means arranges and installs a plurality of shaping | molding metal mold | die, and installs the mold | tightening apparatus which performs the pair opening of a mold | die of a shaping | molding die, closing | closing, and clamping | molding which comprise the said shaping | molding die for every said some shaping | molding die, A direction in which the molding die and the corresponding mold clamping device are freely installed in the parallel direction of the plurality of molding dies, and the molding die and the corresponding mold clamping device are orthogonal to the parallel direction of the molding dies. A retracting mechanism which is installed freely in a movable manner, and each of the plurality of clamping devices is separated from each other by a base which supports the pair of divided types, and a first hook installed on both of the one base of the pair of bases. A stop member and a second stop member provided on both sides of the other base and engaged and separated with respect to the corresponding first stop member; The first stop member and the second stop member are separated from each other in close proximity to each other, and the first stop member and the second stop member engaged in the mold closing in the direction of tightening the pair of divided molds. It is set as the structure provided with the type | mold tightening drive mechanism which drives by tension. As the mold clamping device, the above-mentioned second to sixth problem solving means can be used.

The eighth problem solving means includes closing the mold by accommodating the flyson in a pair of divided molds forming the molding die, and forming the first locking member provided on both sides of one of the divided molds, and the other of the divided molds. Engage the second locking members provided on both sides, and tension the pair of divided molds in the direction of mold tightening while engaging these stop members, and stop the tension in the mold tightening direction when the mold tightening force reaches the desired value. And suction the compressor body to the flyson while maintaining the desired clamping force, release the clamping force after exhausting the suction gas after the suction is completed, thereby separating the first locking member and the second locking member. Next, the blow molding method is to perform mold opening.

In addition, the ninth problem solving means is to perform the tension in the direction of tightening the pair of divided mold by the driving force of the motor, and when the mold tightening force reaches the desired value, the brake is applied to the motor while maintaining the mold tightening force The torque value to be given is lowered to a desired value, the torque value is returned to the original value after the suction is completed, and the mold clamping force is released after the exhaust gas is exhausted. The lowering of the torque value is not particularly limited as long as it can achieve the electric power saving of the motor, but it is preferable that the electric power saving is lowered by about 90% while maintaining the desired clamping force.

The action by the first problem solving means is as follows. That is, when the mold is tightened, the pair of divided molds are first brought close by the drive of the retracting mechanism to close the mold. Then, after the first locking member and the second locking member are engaged, the mold tightening driving mechanism is driven. Since the first fastening member and the second fastening member are tensioned while being tensioned to form a pair of divided molds, the fastening operation of the molding die and high mold tightening force can be achieved, and the mold fastening can be performed reliably. Can be. On the other hand, the release and release of the mold clamping force drive the mold clamping drive mechanism to move the first locking member and the second locking member to the engagement release position, thereby separating the first locking member and the second locking member. After that, the advance mechanism is driven to transfer the pair of divided types.

The action by the second problem solving means is that after the mold closing, the first locking member and the second locking member which are driven by driving the engagement / release drive mechanism can be reliably engaged, and after the engagement, By driving the mold clamping drive mechanism and tensioning the first locking member and the second locking member to tension and tighten the pair of divided molds, high-speed opening and closing operation and high mold clamping force of the molding die can be realized. At the same time, mold tightening can be performed reliably. On the other hand, the release and release of the mold clamping force drive the mold tightening drive mechanism to move the first locking member and the second locking member to the engagement release position, and drive the engagement / release drive mechanism at the first position. The locking member and the second locking member are separated. After that, the advance mechanism is driven to transfer the pair of divided types.

The action by the third problem solving means has the effect that, since the forward and backward movement of the support is synchronized with the type tightening drive mechanism, a separate drive mechanism for the support is unnecessary and the apparatus can be simplified. .

The action by the fourth problem solving means is to synchronize the engagement / release drive mechanism with the advancing and retracting of the cylinder shaft of the cylinder to easily change and adjust the engagement / release position of the first engagement member and the second engagement member. In this case, when the molding die is changed in accordance with the product to be blow molded, the thickness of the pair of divided molds forming the molding die may be changed depending on the product. By changing and adjusting the engagement with the stop member, the engagement of the drive mechanism and the position of the transfer mechanism, there is an effect of absorbing the change in the thickness of the divided mold.

The effect of the fifth problem solving means is that the pair of divided molds can be easily and simply performed at high speed by means of a left-right reverse lead feed screw and an electric motor driving the same. Has

The action by the sixth problem solving means can easily change the mold tightening force by adjusting the torque of the feed screw and the motor driving the same. In addition, when the mold is changed in proximity between the first locking member and the second locking member, that is, when the mold is tightened and the mold is released, there is an effect that the positioning of these members can be easily and simply performed.

The effect of the seventh problem solving means is that the plurality of fasteners can be arranged reasonably, and efficient blow molding can be performed, and the blow molding device itself is relatively compact for the purpose of providing a plurality of fasteners. Thus, the installation space of the hollow apparatus itself can be reduced.

Since the action by the eighth problem solving means stops the tensioning operation while maintaining the desired mold clamping force, it is possible to extend the life of the mold and increase the power of the driving source since no force is applied to the mold. It has the effect of doing it.

Since the action by the ninth problem solving means reaches the desired value, the torque value of the electric motor can be lowered to the desired value while maintaining the mold tightening force while stopping the tension in the mold tightening direction. It has the effect that a saving can be achieved.

As described above, according to the blow molding apparatus and the blow molding method of the present invention, a high clamping force can be expressed and the clamping can be performed reliably. In addition, even when the molding die is changed depending on the product to be blow molded, even if the thickness of the pair of divided molds forming the molding die may be changed depending on the product, the mold thickness is adjusted by the engagement / release driving mechanism. By adjusting the position of the engaging portion, the engagement and separation of the first locking member and the second locking member can be performed without any problem. In addition, according to the blow molding method of the present invention, the tension driving source for tightening the mold can be reduced.

1 is a perspective view showing a type tightening device of a blow molding machine according to a first embodiment of the present invention;

FIG. 2 is a side view showing a mold clamping device of the mold clamping device shown in FIG. 1; FIG.

3 is a side view showing the mold clamping state of the mold clamping device shown in FIG. 1;

4 is a view cut out a part of the type tightening device shown in FIG.

5 is a perspective view showing a blow molding machine of the above embodiment;

6 is a side view showing the blow molding machine shown in FIG.

7 is a front view showing the blow molding machine shown in FIG.

8 is a process flow diagram showing a blow molding method according to a second embodiment of the present invention;

9 is a perspective view showing a blow molding machine according to a third embodiment of the present invention;

10 is a side view of the blow molding machine shown in FIG.

11 is a front view of the blow molding machine shown in FIG.

12 is a plan view of the blow molding machine shown in FIG.

FIG. 13 is a perspective view showing the type tightening device shown in FIG. 9; FIG.

14 is a side view showing a mold clamping device of the mold clamping device shown in FIG. 13;

FIG. 15 is a side view showing the mold clamping state of the mold clamping device shown in FIG. 13; FIG.

16 is a front view of a blow molding apparatus according to a fourth embodiment of the present invention;

FIG. 17 is a perspective view showing a mold clamping device of the blow molding apparatus shown in FIG. 16;

18 is a front view cut out a part of the mold clamping device,

19 is a front view of a portion of the mold clamping apparatus shown in FIG. 18 again;

20 is a front view showing a mold tightening state by the mold clamping device shown in FIG. 18;

21 is a process flow diagram showing a blow molding method according to a fifth embodiment of the present invention;

22 is a front view showing a conventional type tightening device,

It is a front view which shows the other form of the conventional type tightening apparatus.

As shown in Figs. 1 to 4, the mold clamping device 10 in the blow molding apparatus according to the first embodiment of the present invention is provided with a rail 11 provided at a predetermined interval in the horizontal direction, and the rail ( 11, which is slidably mounted at predetermined intervals to face and face the front platen 21 and the rear platen 22, and the molding die 3 held against the pair of platens 21 and 22. And the left and right inverted lead ball screws 4 inserted into the pair of platens 21 and 22 to synchronize the plates with each other so as to be movable toward the parting line PLI. Front convex locking members 51 and 51 and rear concave locking members 52 and 52 provided on the opposite sides of the platens 21 and 22 and on the left and right sides thereof, and each of these locking members. Moving the at least one stop member of (51, 51, 52, 52) so that two sets of engaging portions 5, 5 can be formed; At the same time, the ball screw 6 for the engaging portion connected to the plurality of concave locking members 52 and 52 which enable the two sets of engaging portions 5 and 5 to be tensioned, and the rear platen 22. Generation of clamping force connected to the platen moving motor (7) connected to the left and right reverse lead ball screws (4) located at the rear side of the platen, and to the ball screws (6) for the engaging portion located at the rear side of the rear platen (22). The electric motor 8 is comprised.

In the clamping device 10, the rail 11 is fixed and laid at a predetermined interval so that the front platen 21 and the rear platen 22 are slidable on the upper surface of the frame-shaped mount 1. have.

The rail 11 is a guide for slidingly moving a pair of platens 21 and 22 with respect to the mount. In the drawing, the rail 11 is a linear guide bearing formed by interposing a movable body having a roller portion connected to the endless rail by a guide rail. . However, a simple guide rail other than this may be sufficient, and the track | route of the rigid member used as a substitute for a mount may be sufficient, and what matters is that a pair of platens which are attached to this track | interval at predetermined intervals can be slid and moved smoothly. .

The mount 1 may not be limited to a frame (frame) shape but may be a flat plate shape, or when a rigid rail is used, the frame portion or the like in the sliding and moving direction of the platens 21 and 22 may be replaced by a rail. Also good. It is important that the platen is able to stand up against the rail and move toward a predetermined parting line PLI by the operation of the left and right reverse screws.

The front platen 21 is slidably mounted via a slide member in which a bearing is built into the rail 11 in a frame shape in which a flat plate is hollow. On both sides of the front platen 21, convex locking members 51 and 51 are provided, respectively.

Like the front platen 21, the rear platen 22 is slidably mounted via a slide member incorporating a bearing in the rail 11 in a frame shape with a flat plate. On both sides of the rear platen 22, concave locking members 52, 52 on the rear platen side are provided at positions coinciding with the convex locking members 51, 51 on the front platen 21 side. have.

In the front platen 21 and the rear platen 22, the front divided mold 3a and the rear divided mold 3b constituting the molding die 3 are provided in a facing state. 1 to 4, 9 and 9 are flash sensors, which means that the front platen 21 and the rear platen 22 are in a proximal position, in other words, the front split 3a and the rear split 3b. It is arranged to adjust to the contact position of the contact surface of), and to detect that a pair of split type | mold 3a, 3b contacted normally without interposing excess resin (bur) and other foreign materials.

The left and right reverse lead ball screws 4 are inserted into the front platen 21 and the rear platen 22, and the front platen 21 and the rear platen 22 are synchronized with each other to allow a predetermined parting line PLI. It is to be able to move toward.

The left and right reverse lead ball screws 4 have a reference portion (incomplete threaded portion) 4s approximately at the center, and a forward screw 4a is provided toward the end, and a reverse screw 4b is provided toward the other end. In FIG. 1, the forward screw opening and closing ball screw is called, and the forward screw 4a is screwed onto the forward screw nut (not shown) provided on the front platen 21, and the reverse thread 4b is the rear platen 22. The platen screws 21 and 22 are screwed to the inverted screw nuts 33 provided in the plate screw, so that the platens 21 and 22 move in the near half direction in accordance with the rotation direction of the screws. The end 4c of the ball screw right side is rotatably supported by the bearing in the support 31 of the mount 1. The left end part 4d is rotatably installed by the thrust bearing 34 provided in the motor mounting stand 32, and is coupled with the platen movement electric motor 7 by the coupling 35. As shown in FIG. The left and right reverse lead ball screws 4 and the electric motor 7 form a retraction mechanism 20.

In FIG. 1, one left and right reversal ball screw 4 is provided immediately before the drawing. However, depending on the type of the type tightening device, one more screw is provided on the inner side of the drawing, and both are rotated by tuning. You may be.

The platen moving motor 7 is a servomotor, which rotates the left and right reverse lead ball screws 4 by this driving and rotation, so that the front platen 21 and the rear platen 22 are divided. The molds 3a and 3b are synchronized with each other to move toward and away from the predetermined parting line PLI.

The two sets of engaging portions 5, 5 composed of a pair of uneven locking members 51, 52 form a pair of platens 21, 22 by operation of the left and right reverse lead ball screws 4. The front divided mold 3a is pulled toward the rear divided mold 3b by bringing the contact surfaces of the divided mold 3a and the divided mold 3b into contact with each other by the movement of The front split die 3a immediately before the end is pulled toward the rear split die 3b, and the contact surface of the front split die 3a is pressed against the contact face of the rear split die 3b to generate a mold clamping force.

As shown in Fig. 4, the left and right concave locking members 52 and 52 each include supports 53 and 53 made of a single steel sheet, nuts 54 and 54 provided on these supports, and these nuts. Ball screws 6 and 6 for the engaging portion screwed together, pulleys 61 and 61 provided at the end of the ball screw via thrust bearings 55 and 55 which rotationally supported the ball screws 6 and 6, and left and right A driving pulley 63 having a brake built-in type tightening force generation motor 8 including a drive pulley 63 wound around a belt 62 to a pulley 61 and 61 and a servo motor provided with an output shaft of the drive pulley 63 is connected. have. These supports 53, nuts 54, ball screws 6, thrust bearings 55, pulleys 61, belts 62, drive pulleys 63 and electric motors 8 have a type tightening drive mechanism ( 40).

Each concave locking member 52 consists of a 1st locking arm 52a and a 2nd locking arm 52b, and each arm forms the groove | channel 52c in the base part, and the support body 53 is carried out. The tip of the pin is inserted to support the pins 56 and 57 freely. The left and right supporters 53 and the concave locking member 52 are provided in a guide body 58 made of an inner U-shaped steel plate 58a and an outer flat steel plate 58b. In addition, in the guide body 58 on the left side in FIG. 4, the outer flat steel plate is abbreviate | omitted for description. An upper guide wall 58c and a lower guide wall 58d are formed in a space where the tip extends toward the tip of the guide body 58, and a tip of the concave locking member 52 and the support 53 is formed in this space. Is located. Moreover, the pin 59 which stood up and installed in the outer flat steel plate (not shown) is inserted in the long hole 52d formed in each of the 1st engagement arm 52a and the 2nd engagement arm 52b, As the first stop arm 52a and the second stop arm 52b move toward the front and rear of the support body 53, the pins 59 and 57 are used as the support points, and the pins 59 are in the long holes 52d. By sliding, it may be opened or closed. By this opening and closing operation, the concave locking member 52 engages and disengages the convex locking member 51. Such a support body 53, the pin 56, the pin 57, the guide body 58, the pin 59, and the long hole 52d of the concave locking member 30 are engaged and separated. Configure

At the ends of the convex stop members 51 and 51, for example, an air cylinder or a motor such as a servo motor for engaging the convex stop members 51 and 51 with the concave stop members 52 and 52. The drive part 60 is provided. This drive part 60 protrudes when the convex engaging members 51 and 51 which do not protrude more than the contact (mold) surface of a shaping | molding die are formed in the engaging parts 5 and 5 normally.

In addition, these fastening members are not limited to holding the convex fastening members by the concave fastening members, but are rotated with each other by, for example, hook-type, groove-shaped or uneven surfaces held by both sides. A fitting may be sufficient, and the drive part selected according to this can be provided. In addition, depending on the blow molding machine, a convex locking member is installed on the rear platen side, and a concave locking member is installed on the front platen side. good. It is also possible to use a plurality of electric motors individually by tuning each other without using a pulley or a belt.

The blow molding machine 70 provided with the above-mentioned type clamping device 10 has an extruder having a crosshead die 71 for melting and discharging the parason P made of thermoplastic resin, as shown in Figs. 72, the clamping device 10 provided with the front platen 21 and the back platen 22 to face each other, and the parisons P held by the pair of platens 21 and 22 to face each other. ), A Parisson cutting device (not shown) which cuts an upper end portion of the parison P, which is introduced into and held by the molding die 3 to hold the molded mold 3, and an air suction nozzle inserted into the parison P; The air suction device 74 having the 73 installed therein and the molding die 3 introduced and held by the flyson P are moved under the suction nozzle 73 directly under the crosshead die 71. A mold moving device (not shown) or the like, and the molding die 3 in the mold opening state is moved directly under the crosshead die 71 After introducing and holding the rison P, the air suction nozzle 73 is lowered and inserted into the flyson P by directly moving under the air suction nozzle 73 and passing through the air suction nozzle 73. The air is sucked and the flyson P is blow molded into a blow molded product.

The extruder 72 is a raw material input hopper 75 into which a thermoplastic resin is introduced, a barrel for melting and softening the thermoplastic resin, and a crosshead die for melting and discharging the thermoplastic resin as a cylindrical parason P at its tip. 71 and a control mechanism for controlling the thickness, length, and the like of the cylindrical flyson P, and the like.

The parison cutting device (not shown) introduces and holds the cylindrical shaped parison P melted and ejected from the crosshead die 71 for the head of the extruder into the molding die 3 in the mold opening state. Then, the lower end of the cylindrical flyson P discharged by mold closing the molding die 3 is closed, and the upper end of the discharged cylindrical flyson P is cut off, and the flyson P having a predetermined length is cut. And a cutter holder having an electrothermal cutter at its tip and a drive mechanism for a cutter holder, and a hot cutter method for cutting a cylindrical flyson discharged to an electrothermal cutter by reciprocating the electrothermal cutter.

The air suction device 74 is mounted on a frame fixed to the base 76, has an air suction nozzle 73, and is provided adjacent to the crosshead die 71. The air suction nozzle 73 is a nozzle driving motor 77 made of a servo motor provided through an actuator connected to the air suction nozzle 73, and a control mechanism (not shown) such as an electric circuit for controlling them. When the shaping | molding die 3 which consists of cylindrical shape parason P is arrange | positioned in the lower position of the air suction nozzle 73, the nozzle drive electric motor 77 will drive | operate and operate the air by operation of a control mechanism. After the suction nozzle 73 is moved downward and the air is sucked for a predetermined time, the nozzle driving motor 77 is driven by the operation of the control mechanism to move the air suction nozzle 73 upward. In addition, air is supplied from the source to the air suction nozzle.

The mold clamping device 10 is a front split type on the rail 11 provided at a predetermined interval in the horizontal direction via the slide rail 78 on the base 76 at a position below the extruder 72. (3a) and movable in the direction orthogonal to the opening-and-closing direction of the rear part dividing 3b, the opening-and-closing direction of the shaping | molding die 3 is matched with the axial direction of the extruder 72, and the opening of the shaping | molding die 3 is further opened. Is installed toward the crosshead die 71 side. This rail 11 is provided in the form mounted on the frame body of the longitudinal direction of the frame-form mount 1 on the slide rail 78 on the base 76. As shown in FIG.

Below the mount 1 is provided a ball screw 79 which is driven by an electric motor (not shown) consisting of a servo motor for moving the mount 1, and the mount 1 is a ball nut of the ball screw 79. Is provided so as to be movable through the slide rails 78 which are fixed to the ball screw 79 and arranged on the base 76 in the axial direction of the ball screw 79.

The mold moving device is provided with an air suction device 74 having an air suction nozzle 73 for sucking air into the cylindrical flies P melted and discharged from the crosshead die 71. ), The mold clamping device 10 in which the molding die 3 is installed on the slide rail 78 provided on the base 76 through the platens 21 and 22 is placed on the upper side thereof. A slide rail 78 having a mold clamping device 10 provided with a molding die 3 installed on a base 76 with a mount 1 as a configuration in which the mounted mount 1 is slidably movable. ) Is reciprocated and moved at the lower position of the crosshead die 71 and the lower position of the air suction nozzle 73. In addition, the slide rail 78 may have the same structure as the linear guide bearing installed in the mold clamping device 10.

Next, the effect | action by such a blow molding apparatus is demonstrated with the blow molding method which is 2nd Embodiment of this invention.

In a state where raw material resins such as polyethylene, polypropylene, polyethylene terephthalate and the like are supplied to a raw material input hopper 75 installed in the extruder 72, and the raw material resin is melted and softened in the barrel of the extruder 72. Extruded and hung as a cylindrical parason P via the crosshead die 71, this cylindrical parason P is accommodated in the cavities 3c and 3d of the shaping | molding die 3 of a mold open state.

After storing the cylindrical flapper P, the mold clamping device 10 is driven to close the front split type 3a and the rear split type 3b, and to close the lower end of the cylindrical parison P. At the same time, the upper end is cut with a flyson cutting device (not shown), and the pair of split dies 3a and 3b are then moved directly under the air suction device 74.

Next, the air suction nozzle 73 of the air suction device 74 is inserted into the cylindrical flyson P, whereby the cutting sleeve at the tip of the air suction nozzle 73 and the counter plate on the upper part of the molding die 3 are inserted. The excess resin part (upper burr) in the upper part of the tubular flyson P is cut | disconnected by contact, and the inlet part of a hollow molded article is formed, and the air is sucked in the tubular flyson P from the air suction nozzle 73. Thus, the cylindrical flyson P is molded into a hollow molded article (not shown).

The molded blow-molded product is supported by the air suction nozzle 73, and the mold clamping device 10 is slidably moved while the molding die 3 is opened to be positioned directly under the crosshead die 71 to simultaneously close the mold. The hollow molded product supported by the air suction nozzle 73 is gripped by a product holder (not shown) mounted on the platen side, and after the air suction nozzle 73 is raised, a new cylindrical fly-son P is molded. The mold clamping device 10 accommodated in the mold 3 moves to a position directly under the air suction nozzle 73, thereby completing one molding cycle. The product held by the product holder is transferred to a predetermined position by the take-out device of the post-process at the same time as the mold opening.

Thereafter, the air in the blow-molded product is exhausted, and the molding die 3 is opened so that the mold clamping device 10 moves to a position immediately below the crosshead die 71 to close the molding die 3 and at the same time the hollow mold. The molded product is gripped by a product holder mounted on the side of the platen, and the nozzle driving motor 77 is driven by the operation of the control mechanism to move the air suction nozzle 73 upward.

The timing of the mold opening, mold closing and mold tightening operations and the suction process will be described as follows. That is, as shown in FIG. 7, resin is lined up from the crosshead 71 for a multiple head, and the cylindrical flyson P of right and left is formed in a horizontal direction. At this time, a pair of split type | mold 3a, 3b is in the position of the mold opening shown in FIG. 1 and FIG. 2, and a pair of stop arm 52a, 52b which comprises the concave type | mold stop member 52 is an illustration example It is in an open position as shown in FIG.

Then, as shown in step 1 of FIG. 8, the retraction mechanism 20 is driven, that is, the electric motor 7 is driven to rotate the left and right reverse lead ball screws 4, and the front platen is passed through the front nut (not shown). Through the 21 and the rear nut 33, the rear platen 22 is synchronized with each other to slide on the rail 11, and close to each other toward the parting line PLI to perform mold closing. At the time of closing this mold, the left and right flyson P is introduced into the cavities 3c and 3d and held in the divided molds 3a and 3b.

After closing the mold, as shown in step 2 of FIG. 8, the engagement / release driving mechanism 30 is driven in synchronization with the operation of the mold tightening drive mechanism 40, that is, the driving part movement motor 8 is driven. Rotate the ball screw 6 in the retraction direction. And the nut 54 screwed to the ball screw 6 retreats the support body 53, and the both arms 52a and 52b of the concave locking member 52 have 52 d of holes with a long pin 59d. By sliding the inside), the pins 56 and 57 are rotated in the direction in which the front ends approach each other, that is, in the direction of closing. The pair of stop arms 52a and 52b are rotated to fit the convex portions 51a of the convex stop members 51.

Subsequently, as shown in step 3 of FIG. 8, the type tightening drive mechanism 40 is driven, that is, the motor 8 is driven to rotate the drive pulley 63, and the endless belt 62 is rotated to pull the pulley 61. ), The ball screw 6 is rotated, and the support 53 is tensioned in the direction of arrow A in FIG. 3 via the nut 54. As a result, the leading edge portions 52a1 and 52b1 of both arms pull the convex portion 51a of the convex locking member 51 to the full force, and the front split type 3a is rearward divided by the tension. The tensioning force toward the back side (3a) is pressed against the contact surface of the rear part (3b) to generate a mold clamping force.

As shown in step 4 of FIG. 8, the mold clamping force is checked to reach a desired value, and when the desired value is reached, as shown in step 5, the brake of the built-in motor 8 is turned on, and then the process returns to step 6 again. As shown, the torque value (current value) of the motor 8 is reduced to a predetermined value. In view of power saving, this predetermined value is preferably a torque value of about 10% at the time of mold tightening operation.

The mold die moving device (not shown) is driven in the holding state of the mold clamping force, in other words, the holding pressure of the divided molds 3a and 3b, and the compressed air is removed from the position just below the multihead crossheads 71 and 71. The molding die 3 is moved together with the mold clamping device 10 so that the cavity 3c, 3d is located just below the suction nozzles 73, 73 on the left and right sides of the suction device 74.

Then, compressed air is sucked from the suction nozzles 73 and 73 into the respective parisons P in the cavities 3c and 3d, and when these flysons coincide with the cavities 3c and 3d of the molding die 3, respectively. It blows up to perform suction molding, and a desired hollow molded product is molded.

When the suction is completed, as shown in step 7 of FIG. 8, the torque value of the electric motor 8 is returned to the torque value during mold tightening drive. When the exhaust air is exhausted and exhausting is completed, as shown in step 8 of FIG. 8, after the brake is released, the motor 8 is driven to release the clamping force, that is, the arrow B in FIG. 6) by rotating the support body 53 to engage the tip pole portions 52a1 and 52b1 of the stop arms 52a and 52b with the tip convex portions 51a of the convex stop members 51. Release it.

As shown in step 9 of FIG. 8, the mold tightening drive mechanism 40 is driven, that is, the motor 8 is driven and rotated to rotate the ball screw 6 in the forward direction. And the nut 54 screwed to the ball screw 6 advances the support body 53, and both the arms 52a and 52b of the concave locking member 52 are guide walls 58c of the guide body 58. , 58d), and the pin 59 slides in the long hole 52d, so that the pins 56, 57 are supported as the supporting points, and rotate in the direction in which the front ends are separated from each other, that is, in the open direction. By this series of operations, the pair of stop arms 52a and 52b rotate and release the fitting of the convex portions 51a of the convex stop members 51.

Subsequently, as shown in step 10 of FIG. 8, the retraction mechanism 20 is driven, that is, the electric motor 7 is driven to rotate the left and right reverse lead ball screws 4 and the front platen via a front nut (not shown). The rear platen 22 is separated from the parting line PLI via the 21 and the rear nut 33, and mold opening is performed until the state as shown in Figs.

Thereafter, the molding die moving device (not shown) is driven again to place the molding die 2 directly under the multihead crosshead die 71 as shown in FIG. 6. Thereafter, the resin is draped again from the crosshead die 71 to form left and right cylindrical parasons P as described above, and the mold closing and mold tightening by the mold clamping device 10 and the molding die moving device are performed. The molding die 3 is moved, followed by air suction by the suction nozzles 73 and 73 to perform blow molding, and a series of these steps are repeated.

Next, the blow molding machine which is 3rd Embodiment of this invention is demonstrated based on FIG.

As shown in FIGS. 9-12, this blow molding machine 100 has the extruder 172 which has the multihead crosshead die 171 which melts and discharges the Parison P made from thermoplastic resin, and is so far as to correspond. Two sets of mold clamping devices 110A and 110B in which a pair of platens are provided, molding molds 103A and 103B held in the platens of mold clamping devices 110A and 110B, and molding molds 103A and 103B. Air suction device (not shown) for cutting the upper end portion of the parison P, which is inserted into and held in the cuff, and air suction nozzles 173 and 173 inserted into the parison P. 174A, 174B and the two molding dies 103A, 103B, which are held by introducing the parison P, are alternately placed directly under the air suction nozzles 173, 173 directly under the crosshead die 171. It consists of a metal mold | die moving apparatus etc. which move.

As a result, the molding die provided in one set of the two mold clamping devices 110A and 110B moves directly under the air suction nozzles 173 and 173, and the air in the flyson P in the mold is pushed. The suction nozzles 173 and 173 are lowered and inserted, the air is sucked through the air suction nozzles 173 and 173, and the flyson P is blow molded into the hollow molded product. In the meantime, the molding die installed in the mold clamping device of the other set moves underneath the crosshead die 171 to introduce and hold the parison P and hold it in place. Moves under the nozzles 173 and 173 to lower and insert the air intake nozzle into the flyson P, and sucks the air through the air intake nozzles 173 and 173 to turn the flyson P into a hollow molded product. Blow molding.

The extruder 172 is disposed in two sets of mold clamping devices 110A and 110B in which a molding die is installed, and a raw material input hopper 175 for introducing thermoplastic resins such as polyethylene, polypropylene, polyethylene terephthalate, and the like; Control the thickness and length of the barrel for melting and softening the thermoplastic resin, the crosshead die 171 for melting and discharging the thermoplastic resin as the cylindrical parason P at the distal end, and the cylindrical parason P. And a control mechanism.

The parison cutting device (not shown) introduces and holds the cylindrical parison P melted and ejected from the crosshead die 171 of the extruder into the molds 103A and 103B in the mold-opening state, and is molded. By closing the lower end of the cylindrical flyson P discharged by mold closing and discharging the mold, the upper end of the discharged cylindrical flyson P is cut to form a flyson P having a predetermined length. In the first embodiment, the cutter holder includes a cutter having a heat transfer cutter at the distal end and a drive mechanism for the cutter holder.

The two sets of air suction devices 174A and 174B are mounted on a frame fixed to the Y-direction slide base 181 mounted on the base 176 via the Y-direction slide rail 180, and the molding die 103A. Set in accordance with two sets of clamping apparatuses 110A and 110B provided with 103B, each having air suction nozzles 173 and 173 and provided adjacent to the crosshead die 171.

As in the first embodiment, the air suction nozzles 173 and 173 are provided with nozzle driving motors 177A and 177B provided via an actuator connected thereto, and a control mechanism such as an electric circuit for controlling them. (Not shown) and when the molding dies 103A and 103B incorporating the cylindrical flyson P are disposed at the lower positions of the air suction nozzles 173 and 173, the nozzles are driven by the operation of the control mechanism. After the motors 177A and 177B are driven to move the air suction nozzles 173 and 173 downward, and suck the air for a predetermined time, the nozzle driving motors 177A and 177B are driven by the operation of the control mechanism. Move the air suction nozzles 173 and 173 upwards. Air is supplied to these air suction nozzles from an air generating source (not shown).

The two sets of mold clamping devices 110A and 110B open and close the molding die via the Y-direction slide rail 180 and the Y-direction slide base 181 on the base 176 at the position below the extruder 172. It is arranged to be movable in the same direction as the Y direction, and is moved in the direction orthogonal to the above-described Y direction through the X-direction slide rails 182 and 183 disposed on the Y-direction slide base 181. It is possible to move above these X direction slide bases 184 and 185 also in the Y direction via the rails 111A and 111B on the first X direction slide base 184 and the second X direction slide base 185. The opening and closing directions of the molding dies 103A and 103B are aligned with the axial direction of the extruder 172, and the openings of the molding dies 103A and 103B are directed toward the crosshead die 171 side.

Under the Y-direction slide base 181, a Y-direction ball screw 187 driven by a Y-direction motor 186 made of a Y-direction slide base moving servomotor is provided, and the Y-direction slide base 181 is provided. It is fixed to the ball nut of the Y-direction ball screw 187 and is installed to be movable in the axial direction of the Y-direction ball screw 187 through the Y-direction slide rail 180 provided on the base 176. have.

In addition, the X direction ball screws 190 and 191 driven by the X direction motors 188 and 189 which consist of the servo motor for X direction slide base movement are provided in the lower part of the X direction slide bases 184 and 185, and the X direction slides are provided. The bases 184 and 185 are fixed to the ball nuts of the ball screws 190 and 191 and installed in the X direction which is the axial direction of the ball screws 190 and 191 so as to be movable through the X direction slide rails 182 and 183. It is.

The mold tightening device 110A has the same configuration as the mold tightening device 10 shown in FIGS. 1 to 3, while the mold tightening device 110B has the configuration shown in FIGS. 13 to 15. Since these mold tightening devices have basically the same configuration except that the platen and the driving mechanism are installed opposite to each other, the following description is made with respect to the mold tightening device 110B shown in FIGS. 13 to 15. , Except for a part thereof, those attached to the type fastener 10 shown in FIGS. 1 to 3 are omitted, and a part of the description of the same symbol is omitted.

The mold clamping device 110B includes a front platen 21 and a rear platen 22 which are slidably mounted to the rails 111B provided at predetermined intervals in the horizontal direction at predetermined intervals. The front split type 3a and the rear split type 3b held against the pair of platens 21 and 22 and the pair of platens 21 and 22 by being inserted into the pair of platens 21 and 22. 22) the left and right reverse lead ball screws 4, which are synchronized with each other to move toward the parting line PLI, and the two convex shapes provided on the opposing sides of the pair of platens 21 and 22 Connected to the stop members 51 and 51 and the concave stop members 52 and 52 and the stop members 52 and 52 to move them to form two sets of fasteners 5 and 5. At the same time, the fastening part ball screw 6 for tensioning the fastening parts 5 and 5, and the left and right reverse lead balls located behind the rear platen 22, It consists of the platen movement motor 7 connected to the yarn 4, and the engagement part movement motor 8 connected to the ball screw 6 for the engagement part located behind the rear platen 22. .

The rail 111B is provided in the form mounted on the frame (frame) -shaped X-direction slide base 185 in the longitudinal direction. The X-direction slide base 185 corresponds to the mount 1 shown in FIG. The rail 111B is a guide for slidingly moving the pair of platens 21 and 22 with respect to the X-direction slide base 185. In the drawing, the guide rail is provided with a movable body having a roller portion in which the bearing is connected endlessly. It is a linear guide bearing made of.

The front platen 21 is slidably mounted via a slide member incorporating a bearing in the rail 111B. On both sides of the front platen 21, convex locking members 51 and 51 which are engaged with the locking members 52 and 52 on the rear platen 22 side are provided.

In addition, the rear platen 22 is slidably mounted via a slide member incorporating a bearing in the track 111. On both sides of the rear platen 22, concave locking members 52 and 52 are provided at positions coinciding with the convex locking members 51 and 51 on the front platen 21 side.

In the front platen 21 and the rear platen 22, the front split type 3a and the rear split type 3b are provided in a facing state. In Figs. 13 to 9, 9 and 9 are flash sensors, which means that the front platen 21 and the rear platen 22 are in a predetermined proximity, in other words, the front parting die 3a and the rear parting die 3b. It is arrange | positioned and adjusted in the contact position of the contact surface of ().

The left and right reverse lead ball screws 4 are inserted into the front platen 21 and the rear platen 22, and the front platen 21 and the rear platen 22 are synchronized with each other to form a predetermined parting line PLI. It is to be able to move toward).

The left and right reverse lead ball screws 4 are called left and right reverse lead opening and closing ball screws having a reference portion (incomplete threaded portion) at approximately the center, and having a forward screw installed toward one end, and a reverse screw installed toward the other end. In the inverse screw is installed on the right side, the forward screw is installed on the left side, the left end is fixed by adjusting the height at a predetermined place of the X-direction slide base (185). In addition, the platen movement electric motor 7 is connected to the right end part via the thrust bearing and the coupling 35.

In addition, although one left and right reverse lead ball screw 4 is provided in front of the drawing in FIG. 13, one more is provided in the inner side of the drawing depending on the type of the type tightening device, and the two are rotated by tuning them. You may do it.

The platen moving motor 7 is a servo motor, and the left and right reverse lead ball screws 4 are rotated by this driving and rotation, whereby the front platen 21 and the rear platen 22 are in other words formed molds. 103B moves in half or in proximity towards a predetermined parting line PLI.

The engaging portion 5 is the rear divided type of the front split type 3a in the state where the contact surfaces are brought into contact with each other by the movement of the pair of platens 21 and 22 by the operation of the left and right reverse lead ball screws 4. (3b), or the front split die 3a immediately before the contact surfaces come into contact with each other is pulled toward the rear split die 3b, so that the contact face of the front split die 3a is rear divided ( Pressing on the contact surface of 3b) generates mold clamping force.

A pulley 61 is provided at the end of the concave stop members 52 and 52 via nuts (not shown), ball screws 6 and 6 for fastening portions, and thrust bearings 55, and a pulley 61. Is connected to a fastening part moving motor 8 made of a servomotor via a belt 62 and a drive pulley 63.

At the ends of the convex stop members 51 and 51, a driving part of an electric cylinder or the like such as an air cylinder or a servomotor for engaging the convex stop members 51 and 51 with the concave stop members 52 and 52. 60 is provided. The drive part 60 protrudes when the convex locking members 51 and 51 which do not protrude more than the contact (mold) surface of a shaping | molding die are formed in the engaging parts 5 and 5 normally.

As shown in Figs. 9 to 12, the mold moving device uses an air suction nozzle (B) to suck the air into the tubular flyson P melted and discharged from the crosshead die 171 into the flyson P. 173) is transferred to the lower positions of the nozzle suction devices 174A and 174B, and the mold clamping devices 110A and 110B provided with the molding dies 103A and 103B are moved to the lower positions of the crosshead die 171. As a configuration for reciprocating in the lower position of the air suction nozzle 173, the X-direction slide bases 184, 185 are mounted on the Y-direction slide rail 180 provided on the base 176 so as to be independently slidably movable. It is. In addition, the Y-direction slide rail 180 has the same structure as the linear guide bearings installed in the mold clamping devices (110A, 110B).

On the lower side of the X-direction slide bases 184 and 185 mounted on the Y-direction slide rails 181, X-direction ball screws 190 and 191 are installed in a direction orthogonal to the Y-direction slide rails 180 via ball nuts. These ball screws 190 and 191 are connected to the X-direction mold transfer motors 188 and 189 for driving them via a coupling. By forward and reverse rotation of the X-direction mold transfer motors 188 and 189, the mold clamping devices 110A and 110B provided with the molding dies 103A and 103B are crossheaded for each X-direction slide base 184 and 185. It is possible to reciprocate to a lower position of the die 171 and to a lower position of the air suction nozzles 173 and 173.

The operation of the blow molding machine configured as described above will be described with reference to FIGS. 9 to 13.

First, the molding die 103B in the mold opening state is installed at the lower position of the crosshead die 171 of the extruder 172 by the driving of the mold clamping device 110B, and in this state polyethylene, polypropylene, polyethylene terephthalate The raw material resin, such as the raw material resin, is supplied to the raw material input hopper 175 installed in the extruder 172, and the raw material resin is melted and softened in the barrel of the extruder 172 through the crosshead die 171. It is extruded and hanged as shape | variety parason P, and this cylindrical parason P is accommodated in the cavity of the shaping | molding die 110B of a mold opening state.

After storing the cylindrical flyson P, the mold clamping device 110B is driven to close the molding die 103B, and the lower end of the cylindrical flyson P is closed and the upper end is closed. Cut with a parison cutting device (not shown).

Subsequently, the X direction electric motor 189 is driven and the X direction ball screw 191 which fixed the mold clamping apparatus 110B rotates with the completion | finish of cutting | disconnection of the parison P. As a result, the mold clamping device 110B moves obliquely upward on the right side of FIG. 9, that is, on the upper side in the X direction in FIG. 12 in the state where the molding die 103 is tightened, and the crosshead of the extruder 172 is moved. The molding die 103B is retracted from the parison P continuously extruded continuously from the die 171.

After the movement of the mold clamping device 110B is completed or at the same time as the start of movement, the Y-direction motor 186 is driven and the Y-direction slide base 181 is obliquely lower side of the right side of FIG. 9, that is, Y in FIG. 12. Direction to the right, and when the mold clamping devices 110A and 110B and the air suction devices 174A and 174B on the Y-direction slide base 181 stop at a predetermined position, the parting line of the mold clamping device 110A ( PLI) matches the position of the crosshead die 171, and the position of the mold clamping apparatus 110B and 110A of mold clamping apparatuses is changed.

When the type tightening device 110B moves to the position of the air suction device 174B, the nozzle driving motor 177B made of a servo motor is driven by the operation of the control mechanism, and the air suction nozzles 173 and 173 are moved downward. Each air suction nozzle 173 is moved and inserted into the cylindrical flyson P, whereby the cutting sleeve at the tip of the air suction nozzle 173 and the counter plate on the forming die 103B come into contact with each other. The excess resin portion (upper burr) at the top of (P) is cut to form an inlet portion of the hollow molded article, and at the same time, air is sucked from the air suction nozzle 173 into the cylindrical fly-son P to perform blow molding. .

In the process of air suction by this air suction device 174B, the mold clamping device 110A opens the molding die 103A in an oblique upper side on the left side of FIG. 9, that is, the lower side in the X direction in FIG. 12. After the mold clamping device 110A stops at the lower side of the crosshead die 171 of the extruder 172, the capillary P is held in the mold 103A in the same manner as the mold clamping device 110B. At the same time, the already molded hollow molded article suspended from the air suction nozzle 173 on the air suction device 174A is transferred and gripped to a product holder (not shown) mounted on the sides of the platens 21 and 22. Further, after cutting the cylindrical parason P with the cutting device, the mold clamping device 110A moves obliquely upward on the right side in FIG. 9, that is, upward in the X direction in FIG.

After this movement is completed or at the same time as the start of the movement, the Y-direction slide base 181 moves obliquely upward on the left side of FIG. 9, that is, on the left side of the Y-direction in FIG. The molded article is advanced obliquely downward on the left side of FIG. 9, that is, on the lower side in the X direction in FIG. 12 in a state where a takeout device (not shown) opens the molded product holder of the takeout device, and the front platen 21 is rearward. The hollow molded article, which is transferred and gripped to the product holder mounted on the side of the platen 22, is gripped by closing the molded product holder, and the preparation for taking out the molded molded article (not shown) by the mold clamping device 110B is started. do.

After the movement of the Y-direction slide base 181 is completed and the preparation for taking out the drawing device is completed, the air intake and the air exhaust from the air intake device 174B of the mold clamping device 110B are finished, and the air intake device is finished. The mold opening operation of 174B is started, and the molding die 103B starts the mold opening operation.

Then, the molded product holder of the take-out device that supports the hollow molded product in the place where the molding die 103B is sufficiently opened moves to the bur removal holder of the bur removal device (not shown) for cutting the excess resin (bur) part. One molding cycle by the mold clamping device 110B is completed.

By repeating the above operation, the blow molded article is continuously molded.

Here, the operation of the mold clamping device 110B will be described with reference to Figs. 13 to 15, but this is opposite to the mold clamping device in the embodiment shown in Figs. 1 to 3, that is, the mold clamping device 110A. In addition, substantially the same structure and operation are performed, and the same part or equivalent part as this embodiment is abbreviate | omitted, and is demonstrated.

In this embodiment, in the mold clamping apparatus shown in FIG. 13, the front part 3a and the back part 3b of the mold opening state are located just under the crosshead die 171, and the drive part 60 is shown in FIG. ), The convex locking member 51 is projected in the direction of the concave locking member 52, and the cylindrical flyson is opened in the cavity 3c of the divided type 3a, 3b in the open state. 3d), the platen moving motor 7 is rotated by driving, the left and right reverse lead ball screws 4 are rotated, and the pair of platens 21 and 22 are synchronized with each other on the rail 111. Sliding is moved toward the predetermined parting line PLI, and as shown in FIG. 15, the contact surfaces of a pair of split type | mold 3a, 3b are brought into contact with each other.

Thereafter, the engaging part moving motor 8 made of the servo motor connected to the engaging part ball screw 6 is driven and rotated, and the engaging part ball member 6 is operated to operate the convex locking member 51. The engaging portion 5 is formed by being stopped by the concave stopping member 52, and the ball screw 6 for the engaging portion is rotated in a state where the contact surfaces of the molding die 103a are brought into contact with each other. As a result, the front split die 3a is pulled toward the rear split die 3b, and the contact surface of the front split die 3a is pressed against the contact surface of the rear split die 3b to generate a mold clamping force.

Next, a blow molding apparatus according to a fourth embodiment of the present invention will be described. The blow molding apparatus is an operating part for molding, as shown in Figs. 16 and 17, an extruder (not shown) for melting and extruding a resin composition, a crosshead 201, a parison cutting device (not shown), A molding die 202, a suction device 203, a mold clamping device 204, a molding die moving device 205, and the like are provided.

The not shown extruder is equipped with the hopper 207 for injecting a resin composition, and the screw not shown in the figure for carrying out, kneading, melting, and discharging a resin composition inside.

As shown in FIG. 16, the crosshead 201 is for multiple heads, and is provided by connecting to the front-end | tip of an extruder. The resin composition melted by the extruder is supplied from the extruder to the crosshead 201 so that two cylindrical parasons P shown by the dashed-dotted line in the figure are formed.

The parison cutting device which is not shown in figure cuts the upper part of the cylindrical parison P which hangs from the crosshead 201, and is equipped with the cutter holder which has an electrothermal cutter.

The molding die 202 is composed of a pair of divided dies 202a and 202b as shown in Fig. 17, and the left and right cavities (2) into which two cylindrical fly-sons P are inserted respectively for molding a hollow molded article ( 202c and 202d are formed. The molding die 202 is formed by a molding die moving device 205 provided with an accompanying motor for moving the mold, and the suction nozzles 208 and 208 on the right and left sides of the multihead crosshead 201 and the suction device 203. It is possible to reciprocate alternately in the horizontal direction on the rail (not shown) between the positions immediately below.

Since the suction device 203 inserts into the tubular flyson P from above each of the left and right cavities 202c and 202d of the molding die 202 and sucks compressed air, a pair of left and right suction nozzles ( 208 and 208 and the suction nozzle drive device 209 which raises and lowers these suction nozzles 208 and 208 are provided. The suction nozzle drive device 209 is provided with a variable speed type suction device drive electric motor connected to a control unit (not shown). The suction nozzle 208 is supplied with compressed air from an air source not shown.

As shown in Figs. 16 to 18, the mold clamping device 204 is a mold tightening of the divided molds 202a and 202b of the molding die 202, and is provided with a predetermined interval in a direction parallel to the ground. Rails 210 and 210 extending in the horizontal direction, the front platens 211 and rear platens 212 installed at predetermined intervals so as to be movable on these rails 210 and 210, and these platens ( Convex locking members 213 provided on the left and right sides of 211 and 212 and a concave locking member 214 holding the corresponding locking member 213, and the front platen 211 and the rear plate. The retraction mechanism 220 which separates the ten 212 close to each other, the engagement / elevation drive mechanism 230 which drives the engagement and the release of the locking members 213 and 214, and hangs convexly at the time of mold closing. The concave stopper member 214 held by the stopper member 213 is clamped together with the fastening / release drive mechanism 230. In order to provide a tension tightening drive mechanism 240 is provided.

The front platen 211 is a base for supporting the dividing die 202a in the form of a frame with a flat plate, and the dividing die 202a is detachably installed. Like the platen 211, the rear platen 212 is a base for supporting the divided die 202b in the form of a frame with a hollow plate, and the divided die 202b is detachably installed.

The rails 210 and 210 are attached to the upper surface of the frame mount 260. These rails are linear guide bearings formed through the movable body which has the roller part in which the bearing was connected endlessly at both sides of the guide rail in the figure. However, in addition to this, the rail may be a simple guide rail or a track of a rigid member serving as a substitute for the mount. The mount 260 is not limited to the frame shape but may be a flat plate shape.

The front platen 211 is slidably through the left and right slide members 261 and 261 incorporating linear guide bearings formed on the left and right rails 210 and 210 through a movable body having a roller portion in which the bearings are connected endlessly. I'm hooked. The rear platen 212 is also slidably engaged via the left and right slide members 262 and 262 having bearings mounted on the left and right rails 210 and 210.

The retraction mechanism 220 includes a left and right reverse lead ball screw 221 for moving the platen 211 and 212 in close and half directions with respect to the parting line PLI of the molding die 202 and the rear platen 212. ) And a platen moving motor 222 coupled to the left and right reverse lead ball screws 221 by a coupling 266. The electric motor 222 uses a normal servo motor in this embodiment, but a linear motor or the like may be used.

The left and right reverse lead ball screws 221, which are transfer screws, have a reference portion (incomplete threaded portion) 221s at approximately the center, and a forward screw 221a is provided toward one end, and a reverse screw (toward the other end). In FIG. 3, the forward screw 221a is screwed to the forward screw nut 263 provided on the front platen 211, and the reverse screw 221b is platen. It is screwed to the inverse screw nut 264 provided in 212, and the platen 211, 212 can move to the direction which mutually closes to each other according to the rotation direction of these screws. The right end part 221c of the left and right reverse lead ball screws 221 is rotatably supported by the bearing in the support stand 2650 of the mount 260. The left end part 221d of the left and right reverse lead ball screws 221 is supported. Is rotatably installed by a thrust bearing 224 provided on the motor mounting table 223, and is coupled to the platen moving motor 222 by a coupling 266. In FIG. Cover of the ball screw.

Only one left and right reverse lead ball screw 221 is installed on the left side of the blow molding apparatus itself in FIGS. 17 and 18, but one more is placed on the right side of the blow molding apparatus itself according to the type of the clamping apparatus. Both may be synchronized and rotated.

The platen moving motor 222 is a servo motor, and the left and right reverse lead ball screws 221 are rotated by the motor drive rotation, whereby the front platen 211 and the rear platen 212 are in other words the front side. The dividing die 202a and the rear dividing die 202b are synchronized with each other so as to be closely separated toward a predetermined parting line PLI.

The flash sensor 268 is provided at the position above the left side of the front platen 211 and above the left side of the rear platen 212, and the front platen 211 and the rear platen 212 are disposed. The dividing dies 202a at the front and the dividing dies 202b at the rear are adjusted and arranged at the surface contact position, that is, the closed position of the dies, so that the pair of dividing dies 202a, 202b is interposed with surplus resins, so-called burrs or other foreign matter. It is to detect normal contact without letting it happen.

The type tightening drive mechanism 240 is a ball screw 241 which is a transfer screw coupled to each of the holding members 214 on the left and right sides of the rear platen 212 and a ball screw 241 located at the rear side of the rear platen 212. Is provided with an electric motor (242).

The type tightening drive mechanism 240 further includes a support 243 made of two sheets of steel sheets in which left and right recessed stop members 214 are fixed at both sides thereof, and nuts provided at the left and right supports 243, respectively. 244 and the moving plate 251 provided with the nut 244 and the support body 243, and the ball screw 241 is screwed to these nuts 244. As shown in FIG. In addition, a pulley 245 is provided at each end of the ball screw 241, the drive pulley 246 is wound around the endless belt 247 together with the left and right pulleys 245, and the motor 242 is connected to the reduction gear 252. Is combining. The ball screw 241 is rotatably supported by the thrust bearing 248. The electric motor 242 uses a brake-mounted servomotor in this embodiment, but may use a linear motor with a brake or the like.

The engagement / release drive mechanism 230 includes an air drive cylinder 231 provided on the support 243, couples the first link piece 233 to the cylinder shaft 232 of the cylinder 231, and Both ends of the link piece 233 are linked to the second link piece 234 and the third link piece 235. Further, the ends of the first engagement arm 214a and the second engagement arm 214b constituting the concave engagement member 214 are linked to these link pieces 234 and 235. And the support pins 249 and 250 which spanned between the steel plates of the support body 243 are rotatably supporting these 1st engagement arm 214a and the 2nd engagement arm 214b.

The concave locking member 214 has a position where the first locking arm 214a and the second locking arm 214b are open to each other in the retracted position in which the cylinder shaft 232 is shown in FIGS. 18 and 19. The convex locking member 213 is opened to form a separated shape. However, as shown in FIG. 20, the cylinder shaft 232 moves forward in the mold closing position, so that the first stopping arm 214a and the second stopping arm ( The positions 214b are closed to each other to form a shape in which the convex locking member 213 is fitted. In addition, as shown in FIG. 20, in the initial state in which the concave stop member 214 grips the convex stop member 213, the tip ends of the stop arms 214a and 214b of the concave stop member 214. As shown in FIG. Suitable air gap between the pawls 214a1 and 214b1 and the tip convex portion 213a of the convex locking member 213 so as to prevent rotational movement for engagement and separation by the concave locking member 214. It is intended to form a.

The convex locking member 213 can move back and forth the position provided in the front platen 211 by the drive mechanism 280 shown in FIG. 18 and FIG. The drive mechanism 280 includes a handle shaft 281 for installing a handle (not shown), a lower pulley 282 coupled to the handle shaft 281, an endless belt 283 wound around the lower pulley 282, An upper pulley 284 on which the belt 283 is wound, and a screw portion 285 that moves in the front-rear direction according to the rotation of the upper pulley 284 to move the convex locking member 213 back and forth, and is convex. The end face of the upper pulley 284 is brought into contact with the rear plate of the front platen 211 via the threaded portion 285 so that the tension applied to the shape stop member 213 is continued. In addition, the drive mechanism 280 abbreviate | omits illustration in FIG. 17 for description.

In the blow molding apparatus having the locking members 213 and 214 of this type, a pair of divided mold tightening and mold opening and closing movements are driven by the respective driving systems of the electric motor 242 and the cylinder 231. Therefore, in the case of changing the molding die 202 according to the product to be blow molded, the first locking member 213 is driven by the driving mechanism 280 even if the thickness of the pair of divided molds is changed according to the product. In addition, the second locking member 214 can adjust the position of the engagement and separation by adjusting the position of the moving plate 251 by the rotation of the electric motor 242, thereby absorbing the change of the divided mold thickness. have.

The fastening members 213 and 214 are not limited to holding convex ones as shown in the example shown in the figure, but are, for example, hook-shaped, groove-shaped or uneven surfaces, which both sides hold and engage with each other. It may be rotated and fitted to each other, such as to engage.

Further, depending on the blow molding apparatus, the convex locking member 213 is provided on the rear platen 212 side, and the concave locking member 214 is provided on the front platen 211 side. In accordance with this, a drive mechanism including the pulley 245, the belt 244, and the electric motor 242 may be provided on the front platen side. In addition, the plurality of electric motors 242 may be arranged alone without using a pulley or a belt, and may be used in synchronization with each other.

Next, the effect | action by such a blow molding apparatus is demonstrated with the blow molding method which is 5th Embodiment of this invention.

As shown in FIG. 16, resin is lined up from the crosshead 201 for multiple heads, and cylindrical left-handed parison P is formed in the horizontal direction. At this time, the pair of dividing dies 202a and 202b are in the positions shown in Figs. 17 to 19, and the pair of engagement arms 214a and 214b constituting the concave locking member 214 are shown in the illustrated example. In an open position as shown.

As shown in step 21 of FIG. 21, the retraction mechanism 220 is driven, that is, the electric motor 222 is rotated to rotate the left and right reverse lead ball screws 221 to pass the platen (the front platen) through the nut 263. 211) and the back platen 212 via the nut 264 close each other toward the parting line (PLI) to perform a mold closing. At the time of closing this mold, the left and right parison P is introduced into the cavities 202c and 202d and held in the divided molds 202a and 202b.

After the mold closing, as shown in step 22 of FIG. 21, the engagement / release drive mechanism 230 is driven, that is, the cylinder 231 is driven by air to send the cylinder shaft 232 to the front, and the link piece 233 is driven. The first link piece 234 and the second link piece 235 are arranged in the vertical direction as shown in Fig. 20, and a pair of engaging arms of the concave locking member 214 are formed by these link functions. The convex locking member 213 is inserted by rotating 214a and 214b. At this time, a space | gap is formed a little between the tip pole parts 214a1 and 214b1 of the stop arms 214a and 214b, and the tip convex part 213a of the convex locking member 213. FIG.

Next, as shown in step 23 of FIG. 21, the type tightening drive mechanism 240 is driven, that is, the motor 242 is driven to rotate the speed reducer 252 and the drive pulley 246 and at the same time the endless belt 247 is rotated. The pulley 245 is rotated to rotate, and the ball screw 241 is rotated to pull the support 243 in the direction of arrow A in FIG. 20 via the nut 244. Thereby, together with the support pins 249 and 250 provided in the support 243, the concave locking member 214 is tensioned while engaging the convex locking member 213, and the platen 211, 212 is carried out. The mold clamping force, for example, 50 kN, is generated between the divided molds 202a and 202b through.

Whether the mold clamping force reaches a desired value (e.g., 5.3 Nm when the ball screw lead is 10 mm with a servomotor of 1.5 kilowatts at 50 kN mold clamping force) as shown in step 24 of FIG. When it checks and reaches a desired value, as shown in step 25, the brake incorporating the motor 242 is turned on, and as shown in step 26, the torque value (current value) of the motor 242 is lowered to a predetermined value. In view of power saving, this predetermined value is preferably a torque value of about 10% at the time of mold tightening operation.

The compressed air suction device is driven from the position just below the multihead crossheads 201 and 201 by driving the molding die moving device 205 in the holding state of the mold clamping force, that is, the holding pressure of the divided molds 202a and 202b. The molding die 202 is moved together with the mold clamping device 204 so that the cavity 202a, 202b is located just below the suction nozzles 208, 208 of the left and right of 203. As shown in FIG.

Compressed air is then sucked from the suction nozzles 208 and 208 into the respective parisons P in the cavity 202a and 202b until these parisons coincide with the cavities 202c and 202d of the molding die 202. Swelling is performed by suction, and the desired hollow molded product is molded.

When the suction is completed, as shown in step 27 of FIG. 21, the torque value of the electric motor 242 is returned to the torque value during the type tightening drive. After exhausting the intake air and exhausting, the motor 242 is driven as shown in step 28 of FIG. 21 to rotate the ball screw 241 in the mold clamping force release direction, that is, the arrow B direction in FIG. (243) and move until a slight gap is achieved between the tip pole portions 214a1 and 214b1 of the stop arms 214a and 214b and the tip protrusion 213a of the convex locking member 213. do.

After the movement, as shown in step 29 of FIG. 21, the engagement / release drive mechanism 230 is driven, that is, the cylinder 231 is air driven to tension the cylinder shaft 232 to the rear so that the link piece 233, By the link function of the 1st link piece 234 and the 2nd link piece 235, the pole part 214a1 of the 1st engagement arm 214a and the pole part 214b1 of the 2nd engagement arm 214b mutually mutually. The concave locking member 213 is opened by rotating in the opposite direction.

Next, as shown in step 30 of FIG. 21, the retraction mechanism 220 is driven, that is, the electric motor 222 is driven to rotate the left and right reverse ball screw 221, and the front platen 211 is passed through the nut 263. ) And the rear platen 212 are separated from the parting line PLI via the nut 264, and mold opening is performed until it becomes a state as shown to FIGS. 17-19.

Thereafter, the molding die moving device 205 is driven again to position the molding die 202 directly under the multihead crosshead 201 as shown in FIG. After that, the resin is squeezed again from the multihead crosshead 201 to form left and right cylindrical flies as described above, and the mold closing and mold tightening by the mold clamping device 204 and the mold moving device 205 are formed. The molding die 202 is moved, followed by air suction by the suction nozzles 208 and 208 to perform blow molding, and these series of steps are repeated.

As mentioned above, according to this embodiment, the fastening operation | movement of a molding die and high mold clamping force can be expressed, and mold clamping can be reliably performed. In addition, the tension driving source for clamping can be reduced.

Claims (14)

In a blow molding apparatus which performs mold opening, mold closing, and mold tightening of a pair of mold halves forming a molding die, The mold clamping device includes a retracting mechanism for closely separating the base supporting the pair of divided types, a first stop member provided on both sides of the one base of the pair, and the other base. A second locking member which is installed and engaged with the first locking member corresponding to the first locking member, and the first locking member and the second locking member are separated from each other, And a mold clamping drive mechanism for tensioning and driving said first locking member and said second locking member in a direction in which said pair of split molds are tightened. The method of claim 1, The said mold clamping apparatus is equipped with the mechanism which drives the engagement and separation of the said 1st locking member and the said 2nd locking member, The blow molding apparatus characterized by the above-mentioned. The method of claim 2, The engagement / release driving mechanism pivotally supports the engagement member of one of the first engagement member and the second engagement member to engage the other of the first engagement member and the second engagement member. The support member which moves forward and backward in synchronization with the operation of the type tightening drive mechanism with respect to the stop member, and the one stop member is engaged with and engaged with the other stop member in accordance with the forward and backward motion of the support member. Blow molding apparatus comprising a guide body for guiding. The method of claim 2, And said engaging and disengaging drive mechanism is provided with a cylinder and is engaged with and advancing the cylinder shaft of said cylinder to engage and disengage said first and second locking members. The method of claim 1, And said retraction mechanism is provided with a left and right reverse lead feed screw for synchronizing said pair of divided dies with each other in close proximity, and an electric motor for rotationally driving said left and right reverse lead feed screws. The method of claim 1, And the mold tightening drive mechanism includes a transfer screw for transferring the first stop member and the second stop member in close proximity, and an electric motor for rotationally driving the transfer screw. A plurality of molding dies are arranged and installed, and a mold clamping device for performing a pair of divided mold opening, mold closing, and mold tightening, which constitutes the molding die, is provided for each of the plurality of molding dies. The mold clamping device is freely installed in the parallel direction of the plurality of molding dies, and the molding die and the corresponding mold clamping device are installed freely in a direction perpendicular to the parallel direction of the plurality of molding dies. Each of the plurality of clamping devices includes a retraction mechanism for closely separating the base supporting the pair of divided types, a first stop member provided on both sides of the one base of the pair of bases, and the other. A second locking member which is provided on both sides of the base and is engaged and separated with respect to the corresponding first locking member, and the first locking member A mold which pulls the second stop member close to each other, and tensions and drives the first stop member and the second stop member engaged in the mold closing in a direction of tightening the pair of divided molds; Blow molding device comprising a tightening drive mechanism. The method of claim 7, wherein The said mold clamping apparatus is equipped with the mechanism which drives the engagement and separation of the said 1st locking member and the said 2nd locking member, The blow molding apparatus characterized by the above-mentioned. The method of claim 8, The engagement / release drive mechanism pivotally supports the engagement member of one of the first engagement member and the second engagement member to pivotally support the first engagement member and the first engagement member. 2 the support body which moves forward and backward with respect to the other stop member of the stop member, and the one stop member is guided to the other stop member in a direction to be engaged and carried with respect to the other stop member in accordance with the forward and backward motion of the support member. Blow molding apparatus comprising a guide body to. The method of claim 8, And said engaging and disengaging drive mechanism is provided with a cylinder and is engaged with and advancing the cylinder shaft of said cylinder to engage and disengage said first and second locking members. The method of claim 7, wherein And said retraction mechanism is provided with a left and right reverse lead feed screw for synchronizing said pair of divided dies with each other in close proximity, and an electric motor for rotationally driving said left and right reverse lead feed screws. The method of claim 7, wherein And the mold tightening drive mechanism includes a transfer screw for transferring the first stop member and the second stop member in close proximity, and an electric motor for rotationally driving the transfer screw. The closing of the mold is carried out by accommodating the flyson in the pair of divided molds forming the molding die, and the first locking member provided on both sides of one of the divided molds and the second hooked on both sides of the divided molds. Engage the stop members, and while engaging these stop members, tension the pair of divided molds in the direction of mold tightening, and when the mold clamping force reaches a desired value, the tension in the mold clamping direction is stopped and the desired mold clamping force is maintained. While the compressor is sucked into the flyson, and after the suction is completed, the mold clamping force is released to release the first locking member and the second locking member, and then mold opening is performed. Blow molding method characterized in that. The method of claim 13, The torque in the direction in which the pair of divided dies is tightened by the driving force of the electric motor, and when the tightening force reaches the desired value, the torque applied to the motor while applying the brake to the motor while maintaining the tightening force is a desired value. And lowering the torque value to the original value after the completion of the suction and releasing the clamping force after the exhaust gas is exhausted.

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