JP7163044B2 - injection molding unit - Google Patents

Description

The present invention relates to injection molding units.

Conventionally, in order to perform two-material molding, another injection device is added to an injection molding machine having a single injection device (for example, Patent Document 1). In this configuration, the additional injection device is arranged on the non-operation side, and positioned and attached to the tie bar, stationary platen, or mold on the molding machine main body side via a bracket or the like.

JP-A-7-144356

In the above conventional method, when the mold to be used is changed, it is necessary to remove the additional injection device, position it again, and then reinstall it. Moreover, when the additional injection device is used in another injection molding machine, it is necessary to remove the additional injection device and newly position and attach it to the other injection molding machine. Thus, there is a problem that it takes a long time to install the additional injection device, resulting in a long setup time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection molding unit capable of shortening the time required to attach an additional injection device.

In order to solve the above problems, an injection molding unit according to an aspect of the present invention includes an injection molding machine having an injection device that fills a mold with a molding material; an additional injection device that fills the mold with a molding material; an additional injection unit that is movable to a location of another injection molding machine and has a transport section that carries and transports the additional injection device; and a connecting section that connects the injection molding machine and the additional injection unit. , wherein the additional injection device of the additional injection unit is arranged at a position where the molding material is filled in the side surface of the mold from a horizontal direction orthogonal to the opening and closing direction of the mold, and the additional injection unit is connected to the injection molding machine via the connecting part, and the connecting part allows the additional injection device to be slidable in the opening and closing direction of the mold and to be fixed at any position in the opening and closing direction. It is said that

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, it is possible to provide an injection molding unit capable of shortening the time required to attach an additional injection device.

It is a figure which shows the state at the time of completion of mold opening of the injection molding machine by one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine by one Embodiment. It is a side view which shows schematic structure of the injection molding unit which concerns on embodiment. It is a top view showing a schematic structure of an injection molding unit concerning an embodiment. FIG. 4 is a perspective view showing an example of the structure of a connecting portion between an injection molding machine and an additional injection unit; FIG. 6 is an exploded perspective view of the connecting portion shown in FIG. 5; FIG. 6 is a perspective view showing a horizontal cross section of the engaging portion in FIG. 5; FIG. 11 is a perspective view showing a modification of the structure of the connecting portion between the injection molding machine and the additional injection unit; FIG. 9 is an exploded perspective view of the connecting portion shown in FIG. 8; FIG. 9 is a perspective view showing a horizontal cross section of the engaging portion in FIG. 8;

Embodiments will be described below with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.

[Schematic configuration of injection molding machine]
First, with reference to FIGS. 1 and 2, the overall schematic configuration of an injection molding machine 2 that is the basis of this embodiment will be described. 1, 2, etc., the X direction, the Y direction, and the Z direction are directions perpendicular to each other. The X and Y directions are horizontal, and the Z direction is vertical. When the mold clamping device is of a horizontal type, the X direction is the mold opening/closing direction, and the Y direction is the width direction of the injection molding machine 2 .

(Injection molding machine)
FIG. 1 is a diagram showing a state of an injection molding machine 2 according to one embodiment when mold opening is completed. FIG. 2 is a diagram showing a state of the injection molding machine 2 according to one embodiment at the time of mold clamping. As shown in FIGS. 1 and 2, the injection molding machine 2 has a mold clamping device 100, an ejector device 200, an injection device 300, a moving device 400, a control device 700, and a frame Fr. Each component of the injection molding machine 2 will be described below.

(mold clamping device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (the right direction in FIGS. 1 and 2) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (the left direction in FIGS. 1 and 2). direction) is described as backward.

The mold clamping device 100 performs mold closing, mold clamping, and mold opening of the mold device 10 . The mold clamping device 100 is of a horizontal type, for example, and the mold opening/closing direction is horizontal. The mold clamping device 100 has a fixed platen 110 , a movable platen 120 , a toggle support 130 , tie bars 140 , a toggle mechanism 150 , a mold clamping motor 160 , a motion converting mechanism 170 and a mold thickness adjusting mechanism 180 .

A fixed platen 110 is fixed with respect to the frame Fr. A fixed mold 11 is attached to the surface of the fixed platen 110 facing the movable platen 120 .

The movable platen 120 is movable relative to the frame Fr in the mold opening/closing direction. A guide 101 for guiding the movable platen 120 is laid on the frame Fr. The movable mold 12 is attached to the surface of the movable platen 120 facing the stationary platen 110 .

Mold closing, mold clamping, and mold opening are performed by moving the movable platen 120 back and forth with respect to the stationary platen 110 . A mold device 10 is composed of a fixed mold 11 and a movable mold 12 .

The toggle support 130 is connected to the fixed platen 110 with a gap therebetween and is mounted on the frame Fr so as to be movable in the mold opening/closing direction. Note that the toggle support 130 may be movable along a guide laid on the frame Fr. The guides of the toggle support 130 may be common with the guides 101 of the movable platen 120 .

In this embodiment, the stationary platen 110 is fixed to the frame Fr, and the toggle support 130 is movable relative to the frame Fr in the mold opening/closing direction. 110 may be movable relative to the frame Fr in the mold opening/closing direction.

The tie bar 140 connects the stationary platen 110 and the toggle support 130 with a gap L in the mold opening/closing direction. A plurality of (for example, four) tie bars 140 may be used. Each tie bar 140 is parallel to the mold opening/closing direction and extends according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects strain of the tie bar 140 . Tie-bar distortion detector 141 sends a signal indicating the detection result to control device 700 . The detection result of the tie bar strain detector 141 is used for detection of mold clamping force and the like.

In this embodiment, the tie bar strain detector 141 is used as a mold clamping force detector that detects the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, but may be of piezoelectric type, capacitive type, hydraulic type, electromagnetic type, etc., and its mounting position is not limited to the tie bar 140 either.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130 and moves the movable platen 120 relative to the toggle support 130 in the mold opening/closing direction. The toggle mechanism 150 is composed of a crosshead 151, a pair of link groups, and the like. Each link group has a first link 152 and a second link 153 that are connected with pins or the like so as to be bendable and stretchable. The first link 152 is swingably attached to the movable platen 120 with a pin or the like, and the second link 153 is swingably attached to the toggle support 130 with a pin or the like. A second link 153 is attached to the crosshead 151 via a third link 154 . When the crosshead 151 advances and retreats with respect to the toggle support 130 , the first link 152 and the second link 153 bend and stretch, and the movable platen 120 advances and retreats with respect to the toggle support 130 .

The configuration of the toggle mechanism 150 is not limited to the configuration shown in FIGS. 1 and 2. FIG. For example, in FIGS. 1 and 2, the number of nodes in each link group is five, but the number may be four, and one end of the third link 154 is coupled to the node between the first link 152 and the second link 153. may be

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150 . The mold clamping motor 160 advances and retreats the crosshead 151 with respect to the toggle support 130 , thereby bending and stretching the first link 152 and the second link 153 to advance and retreat the movable platen 120 with respect to the toggle support 130 . The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.

The motion conversion mechanism 170 converts rotary motion of the mold clamping motor 160 into linear motion of the crosshead 151 . The motion converting mechanism 170 includes a threaded shaft 171 and a threaded nut 172 screwed onto the threaded shaft 171 . Balls or rollers may be interposed between the screw shaft 171 and the screw nut 172 .

The mold clamping device 100 performs a mold closing process, a mold clamping process, a mold opening process, etc. under the control of the control device 700 .

In the mold closing process, the mold clamping motor 160 is driven to advance the crosshead 151 at a set speed to the mold closing completion position, thereby advancing the movable platen 120 and bringing the movable mold 12 into contact with the fixed mold 11 . The position and speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 detects rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700 . The crosshead position detector for detecting the position of the crosshead 151 and the crosshead speed detector for detecting the speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and general ones can be used. Further, the movable platen position detector for detecting the position of the movable platen 120 and the movable platen speed detector for detecting the speed of the movable platen 120 are not limited to the mold clamping motor encoder 161, and general ones can be used.

In the mold clamping process, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position, thereby generating a mold clamping force. A cavity space 14 (see FIG. 2) is formed between the movable mold 12 and the fixed mold 11 during mold clamping, and the injection device 300 fills the cavity space 14 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. A plurality of cavity spaces 14 may be provided, in which case a plurality of molded products can be obtained at the same time.

In the mold opening step, the mold clamping motor 160 is driven to retract the crosshead 151 at a set speed to the mold opening completion position, thereby retracting the movable platen 120 and separating the movable mold 12 from the fixed mold 11 . After that, the ejector device 200 ejects the molded product from the movable mold 12 .

The setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed and position of the crosshead 151 in the mold closing process and the mold clamping process (including the mold closing start position, speed switching position, mold closing completion position, and mold clamping position), and the mold clamping force are set as a series of setting conditions. , are set together. The mold closing start position, speed switching position, mold closing completion position, and mold clamping position are arranged in this order from the rear side to the front side, and represent the start point and end point of the section in which the speed is set. A speed is set for each section. The number of speed switching positions may be one or plural. The speed switching position may not be set. Only one of the mold clamping position and the mold clamping force may be set.
The setting conditions in the mold opening process are also set in the same manner. For example, the speed and position of the crosshead 151 in the mold opening process (including the mold opening start position, speed switching position, and mold opening completion position) are collectively set as a series of setting conditions. The mold opening start position, the speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side, and represent the start point and end point of the section in which the speed is set. A speed is set for each section. The number of speed switching positions may be one or plural. The speed switching position may not be set. The mold opening start position and the mold closing position may be the same position. Also, the mold opening completion position and the mold closing start position may be the same position.
Incidentally, instead of the speed and position of the crosshead 151, the speed and position of the movable platen 120 may be set. Also, the mold clamping force may be set instead of the position of the crosshead (for example, mold clamping position) or the position of the movable platen.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120 . The amplification factor is also called toggle factor. The toggle magnification changes according to the angle θ formed between the first link 152 and the second link 153 (hereinafter also referred to as “link angle θ”). The link angle θ is obtained from the position of the crosshead 151 . When the link angle θ is 180°, the toggle magnification becomes maximum.

When the thickness of the mold apparatus 10 changes due to replacement of the mold apparatus 10 or temperature change of the mold apparatus 10, the mold thickness is adjusted so that a predetermined mold clamping force can be obtained during mold clamping. In the mold thickness adjustment, the distance L between the fixed platen 110 and the toggle support 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time when the movable mold 12 touches the fixed mold 11, for example. to adjust.

The mold clamping device 100 has a mold thickness adjustment mechanism 180 that adjusts the mold thickness by adjusting the distance L between the stationary platen 110 and the toggle support 130 . The mold thickness adjusting mechanism 180 rotates a threaded shaft 181 formed at the rear end of the tie bar 140, a threaded nut 182 rotatably held by the toggle support 130, and a threaded nut 182 screwed onto the threaded shaft 181. and a mold thickness adjusting motor 183 .

A threaded shaft 181 and a threaded nut 182 are provided for each tie bar 140 . Rotation of the mold thickness adjustment motor 183 may be transmitted to the plurality of screw nuts 182 via the rotation transmission portion 185 . Multiple screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotation transmission part 185, it is also possible to rotate the plurality of screw nuts 182 individually.

The rotation transmission part 185 is configured by, for example, a gear. In this case, a passive gear is formed on the outer circumference of each screw nut 182, a driving gear is attached to the output shaft of the mold thickness adjusting motor 183, and an intermediate gear meshing with the plurality of passive gears and the driving gear is formed in the central portion of the toggle support 130. rotatably held. Incidentally, the rotation transmission part 185 may be configured by a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the controller 700 . The control device 700 drives the mold thickness adjustment motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle support 130 that rotatably holds the screw nut 182 with respect to the fixed platen 110. The distance L from the toggle support 130 is adjusted.

In this embodiment, the screw nut 182 is rotatably held on the toggle support 130, and the tie bar 140 on which the screw shaft 181 is formed is fixed on the fixed platen 110, but the present invention is not limited to this.

For example, screw nut 182 may be rotatably retained to stationary platen 110 and tie bar 140 may be fixed to toggle support 130 . In this case, the gap L can be adjusted by rotating the screw nut 182 .

Also, a screw nut 182 may be fixed to the toggle support 130 to hold the tie bar 140 rotatably relative to the stationary platen 110 . In this case, the interval L can be adjusted by rotating the tie bar 140 .

Furthermore, a screw nut 182 may be fixed to the stationary platen 110 to hold the tie bar 140 rotatably relative to the toggle support 130 . In this case, the interval L can be adjusted by rotating the tie bar 140 .

The interval L is detected using the mold thickness adjusting motor encoder 184 . The mold thickness adjusting motor encoder 184 detects the amount and direction of rotation of the mold thickness adjusting motor 183 and sends a signal indicating the detection result to the control device 700 . The detection result of the mold thickness adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130 . The toggle support position detector for detecting the position of the toggle support 130 and the gap detector for detecting the gap L are not limited to the mold thickness adjusting motor encoder 184, and general ones can be used.

The mold thickness adjusting mechanism 180 adjusts the interval L by rotating one of a screw shaft 181 and a screw nut 182 that are screwed together. A plurality of mold thickness adjusting mechanisms 180 may be used, and a plurality of mold thickness adjusting motors 183 may be used.

Incidentally, the mold thickness adjusting mechanism 180 of this embodiment has a threaded shaft 181 formed on the tie bar 140 and a threaded nut 182 screwed onto the threaded shaft 181 in order to adjust the interval L, but the present invention does not include this. is not limited to

For example, the mold thickness adjustment mechanism 180 may have a tie bar temperature adjuster that adjusts the temperature of the tie bars 140 . A tie-bar temperature controller is attached to each tie-bar 140 and adjusts the temperature of the plurality of tie-bars 140 in cooperation. The higher the temperature of the tie bars 140, the longer the tie bars 140 due to thermal expansion, and the larger the interval L becomes. The temperature of multiple tie bars 140 can also be adjusted independently.

The tie-bar temperature controller includes a heater such as a heater, and adjusts the temperature of the tie-bar 140 by heating. The tie bar temperature adjuster may include a cooler such as a water cooling jacket, and adjust the temperature of tie bar 140 by cooling. A tie bar temperature controller may include both a heater and a cooler.

The mold clamping device 100 of this embodiment is a horizontal type in which the mold opening/closing direction is horizontal, but may be a vertical type in which the mold opening/closing direction is a vertical direction. A vertical mold clamping device has a lower platen, an upper platen, a toggle support, a tie bar, a toggle mechanism, a mold clamping motor, and the like. One of the lower platen and the upper platen is used as a fixed platen and the other as a movable platen. A lower mold is attached to the lower platen, and an upper mold is attached to the upper platen. A mold device is composed of the lower mold and the upper mold. The lower mold may be attached to the lower platen via a rotary table. The toggle support is arranged below the lower platen and connected to the upper platen via tie bars. The tie bar connects the upper platen and the toggle support at intervals in the mold opening/closing direction. The toggle mechanism is arranged between the toggle support and the lower platen to raise and lower the movable platen. A mold clamp motor operates a toggle mechanism. When the mold clamping device is of vertical type, the number of tie bars is usually three. The number of tie bars is not particularly limited.

Although the mold clamping device 100 of this embodiment has the mold clamping motor 160 as a drive source, the mold clamping motor 160 may be replaced by a hydraulic cylinder. Further, the mold clamping device 100 may have a linear motor for mold opening and closing and an electromagnet for mold clamping.

(ejector device)
In the description of the ejector device 200, as in the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (the right direction in FIGS. 1 and 2) is assumed to be forward, and the movement of the movable platen 120 when the mold is opened The direction (the left direction in FIGS. 1 and 2) will be described as the rear.

The ejector device 200 ejects a molded product from the mold device 10. As shown in FIG. The ejector device 200 has an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

Ejector motor 210 is attached to movable platen 120 . The ejector motor 210 is directly connected to the motion conversion mechanism 220, but may be connected to the motion conversion mechanism 220 via a belt, pulley, or the like.

The motion conversion mechanism 220 converts rotary motion of the ejector motor 210 into linear motion of the ejector rod 230 . Motion converting mechanism 220 includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejector rod 230 can move back and forth through the through hole of the movable platen 120 . A front end portion of the ejector rod 230 contacts the movable member 15 which is disposed inside the movable mold 12 so as to be able to move back and forth. The front end of the ejector rod 230 may or may not be connected to the movable member 15 .

The ejector device 200 performs an ejection process under the control of the control device 700 .

In the ejection process, the ejector motor 210 is driven to advance the ejector rod 230 from the standby position to the ejection position at a set speed, thereby advancing the movable member 15 and ejecting the molded product. Thereafter, the ejector motor 210 is driven to retract the ejector rod 230 at a set speed, thereby retracting the movable member 15 to the original standby position. The position and speed of the ejector rod 230 are detected using the ejector motor encoder 211, for example. The ejector motor encoder 211 detects rotation of the ejector motor 210 and sends a signal indicating the detection result to the control device 700 . The ejector rod position detector for detecting the position of the ejector rod 230 and the ejector rod speed detector for detecting the speed of the ejector rod 230 are not limited to the ejector motor encoder 211, and general ones can be used.

(Injection device)
In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejector device 200, the moving direction of the screw 330 during filling (the left direction in FIGS. The moving direction of (rightward direction in FIGS. 1 and 2) will be described as the rearward direction.

The injection device 300 is installed on a slide base 301 that can move back and forth with respect to the frame Fr, and can move back and forth with respect to the mold device 10 . The injection device 300 touches the mold device 10 and fills the cavity space 14 in the mold device 10 with the molding material. The injection device 300 has, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied inside from the supply port 311 . The molding material includes, for example, resin. The molding material is formed into, for example, a pellet shape and supplied to the supply port 311 in a solid state. A supply port 311 is formed in the rear portion of the cylinder 310 . A cooler 312 such as a water-cooled cylinder is provided on the outer circumference of the rear portion of the cylinder 310 . A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 ahead of the cooler 312 .

Cylinder 310 is divided into a plurality of zones in the axial direction of cylinder 310 (horizontal direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. The controller 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature for each zone.

A nozzle 320 is provided at the front end of the cylinder 310 and pressed against the mold apparatus 10 . A heater 313 and a temperature detector 314 are provided around the nozzle 320 . The controller 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is arranged in the cylinder 310 so as to be rotatable and advanceable. When the screw 330 is rotated, the molding material is sent forward along the helical groove of the screw 330 . The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold device 10 .

A backflow prevention ring 331 is movably attached to the front portion of the screw 330 as a backflow prevention valve that prevents backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

The anti-backflow ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 when the screw 330 is advanced, and is relatively to the screw 330 until it reaches a closed position (see FIG. 2) that blocks the flow path of the molding material. fall back. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, the anti-backflow ring 331 is pushed forward by the pressure of the molding material sent forward along the helical groove of the screw 330 when the screw 330 is rotated, and is in an open position where the flow path of the molding material is opened. (see FIG. 1) relative to the screw 330. Thereby, the molding material is sent forward of the screw 330 .

The anti-backflow ring 331 may be either a co-rotating type that rotates together with the screw 330 or a non-co-rotating type that does not rotate together with the screw 330 .

The injection device 300 may have a drive source for advancing and retracting the anti-backflow ring 331 with respect to the screw 330 between the open position and the closed position.

Metering motor 340 rotates screw 330 . The drive source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 advances and retreats the screw 330 . Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like that converts the rotary motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. Balls, rollers, or the like may be provided between the screw shaft and the screw nut. The drive source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

Pressure detector 360 detects the pressure transmitted between injection motor 350 and screw 330 . A pressure detector 360 is provided in a force transmission path between the injection motor 350 and the screw 330 to detect the pressure acting on the pressure detector 360 .

Pressure detector 360 sends a signal indicating the detection result to controller 700 . The detection result of the pressure detector 360 is used for controlling and monitoring the pressure that the screw 330 receives from the molding material, the back pressure against the screw 330, the pressure that the screw 330 acts on the molding material, and the like.

The injection device 300 performs a weighing process, a filling process, a holding pressure process, and the like under the control of the control device 700 .

In the weighing process, the weighing motor 340 is driven to rotate the screw 330 at a set number of revolutions, and the molding material is fed forward along the helical groove of the screw 330 . Along with this, the molding material is gradually melted. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . The number of rotations of the screw 330 is detected using a metering motor encoder 341, for example. Weighing motor encoder 341 detects the rotation of weighing motor 340 and sends a signal indicating the detection result to control device 700 . Incidentally, the screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the weighing motor encoder 341, and a general one can be used.

During the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 to limit its rapid retraction. The back pressure on screw 330 is detected using pressure detector 360, for example. Pressure detector 360 sends a signal indicating the detection result to controller 700 . The metering process is completed when the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330 .

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 14 in the mold apparatus 10 . The position and speed of the screw 330 are detected using an injection motor encoder 351, for example. The injection motor encoder 351 detects rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700 . When the position of the screw 330 reaches the set position, switching from the filling process to the holding pressure process (so-called V/P switching) is performed. A position at which V/P switching is performed is also called a V/P switching position. The set speed of the screw 330 may be changed according to the position of the screw 330, time, and the like.

After the position of the screw 330 reaches the set position in the filling process, the screw 330 may be temporarily stopped at the set position, and then the V/P switching may be performed. Immediately before the V/P switching, instead of stopping the screw 330, the screw 330 may be moved forward or backward slowly. Moreover, the screw position detector for detecting the position of the screw 330 and the screw speed detector for detecting the speed of the screw 330 are not limited to the injection motor encoder 351, and general ones can be used.

In the holding pressure process, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the front end of the screw 330 (hereinafter also referred to as “holding pressure”) is maintained at the set pressure. The remaining molding material is pushed toward the mold device 10 . A shortage of molding material due to cooling shrinkage in the mold apparatus 10 can be replenished. The holding pressure is detected using a pressure detector 360, for example. Pressure detector 360 sends a signal indicating the detection result to controller 700 . The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure process.

In the holding pressure process, the molding material in the cavity space 14 inside the mold apparatus 10 is gradually cooled, and when the holding pressure process is completed, the entrance of the cavity space 14 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the cavity space 14 is prevented. After the holding pressure process, the cooling process is started. In the cooling process, the molding material in the cavity space 14 is solidified. A weighing step may be performed during the cooling step to reduce molding cycle time.

Although the injection device 300 of this embodiment is of the in-line screw type, it may be of a pre-plastic type or the like. A pre-plastic injection apparatus supplies molding material melted in a plasticizing cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold apparatus. A screw is arranged rotatably or rotatably and forwards and backwards within the plasticizing cylinder, and a plunger is arranged movably forwards and backwards within the injection cylinder.

Further, the injection apparatus 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is vertical. The mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 may be horizontal or vertical.

(moving device)
In the description of the moving device 400, as in the description of the injection device 300, the moving direction of the screw 330 during filling (the left direction in FIGS. The right direction in FIG. 2) will be described as the rear.

The moving device 400 moves the injection device 300 forward and backward with respect to the mold device 10 . Further, the moving device 400 presses the nozzle 320 against the mold device 10 to generate nozzle touch pressure. The moving device 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

Hydraulic pump 410 has a first port 411 and a second port 412 . Hydraulic pump 410 is a pump that can rotate in both directions, and by switching the direction of rotation of motor 420, hydraulic fluid (for example, oil) is sucked from one of first port 411 and second port 412 and discharged from the other. to generate hydraulic pressure. The hydraulic pump 410 can also suck the working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412 .

Motor 420 operates hydraulic pump 410 . Motor 420 drives hydraulic pump 410 with a rotational direction and rotational torque according to a control signal from control device 700 . Motor 420 may be an electric motor or may be an electric servomotor.

Hydraulic cylinder 430 has a cylinder body 431 , a piston 432 and a piston rod 433 . The cylinder body 431 is fixed with respect to the injection device 300 . The piston 432 partitions the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. Piston rod 433 is fixed relative to stationary platen 110 .

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 401 . The hydraulic fluid discharged from the first port 411 is supplied to the front chamber 435 through the first flow path 401, thereby pushing the injection device 300 forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 11 . The front chamber 435 functions as a pressure chamber that generates nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410 .

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 402 . The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the second flow path 402, thereby pushing the injection device 300 rearward. The injection device 300 is retracted, and the nozzle 320 is separated from the stationary mold 11 .

Although the moving device 400 includes the hydraulic cylinder 430 in this embodiment, the present invention is not limited to this. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotary motion of the electric motor to the linear motion of the injection device 300 may be used.

(Control device)
The control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704, as shown in FIGS. The control device 700 performs various controls by causing the CPU 701 to execute programs stored in the storage medium 702 . The control device 700 also receives signals from the outside through an input interface 703 and transmits signals to the outside through an output interface 704 .

The control device 700 repeatedly manufactures a molded product by repeatedly performing a mold closing process, a mold clamping process, a mold opening process, and the like. Further, the control device 700 performs a weighing process, a filling process, a holding pressure process, etc. between the mold clamping processes. A series of operations for obtaining a molded product, for example, the operation from the start of the weighing process to the start of the next weighing process, is also called "shot" or "molding cycle". The time required for one shot is also called "molding cycle time".
One molding cycle has, for example, a weighing process, a mold closing process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a mold opening process, and an ejecting process in this order. The order here is the order of the start of each step. The filling process, holding pressure process, and cooling process are performed from the start of the mold clamping process to the end of the mold clamping process. The end of the mold closing process coincides with the start of the mold opening process. In addition, in order to shorten the molding cycle time, a plurality of steps may be performed at the same time. For example, the metering step may occur during the cooling step of the previous molding cycle, in which case the mold closing step may occur at the beginning of the molding cycle. The filling process may also be initiated during the mold closing process. Also, the ejecting process may be initiated during the mold opening process. If an on-off valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process may be initiated during the metering process. This is because the molding material does not leak from the nozzle 320 as long as the on-off valve closes the flow path of the nozzle 320 even if the mold opening process is started during the metering process.

The control device 700 is connected to an operation device 750 and a display device 760 . The operation device 750 receives input operations by the user and outputs signals corresponding to the input operations to the control device 700 . The display device 760 displays an operation screen corresponding to an input operation on the operation device 750 under the control of the control device 700 .

The operation screen is used for setting the injection molding machine 2 and the like. A plurality of operation screens are prepared and displayed by switching or displayed in an overlapping manner. The user operates the operation device 750 while viewing the operation screen displayed on the display device 760 to perform settings (including input of set values) for the injection molding machine 2 .

The operation device 750 and the display device 760 may be configured by, for example, a touch panel and integrated. Although the operating device 750 and the display device 760 of this embodiment are integrated, they may be provided independently. Also, a plurality of operating devices 750 may be provided.

[Injection molding unit]
An injection molding unit 1 according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a side view showing a schematic configuration of the injection molding unit 1 according to the embodiment. FIG. 4 is a plan view showing a schematic configuration of the injection molding unit 1 according to the embodiment.

As shown in FIGS. 3 and 4, the injection molding unit 1 according to this embodiment includes the injection molding machine 2 described with reference to FIGS. 3 and a connecting portion 35 that connects the injection molding machine 2 and the additional injection unit 3 . The additional injection unit 3 is equipped with an additional injection device 31 different from the injection device 300 of the injection molding machine 2 . The additional injection unit 3 can be moved manually or automatically, and is configured to be connectable to the injection molding machine 2 via a connecting portion 35 . The injection molding unit 1 can perform two-material molding by using the injection device 300 of the injection molding machine 2 and the additional injection device 31 of the additional injection unit 3 in combination.

The additional injection unit 3 has an additional injection device 31, an additional movement device 32, and a transport section 33, as shown in FIG.

Like the injection device 300, the additional injection device 31 can touch the mold device 10 of the injection molding machine 2 and fill the cavity space 14 in the mold device 10 with molding material. The basic configuration of the additional injection device 31 is the same as the configuration of the injection device 300 described above. In the present embodiment, the additional injection device 31 is arranged at a position where the molding material is filled from the horizontal direction perpendicular to the opening and closing direction of the mold with respect to the side surface of the mold, and a molding material different from that of the injection device 300 is injected. Fill the mold.

The additional moving device 32 advances and retreats the additional injection device 31 in one direction. The basic configuration of the additional moving device 32 is similar to the configuration of the moving device 400 described above. In this embodiment, the additional moving device 32 moves the additional injection device 31 in a horizontal direction perpendicular to the opening and closing direction of the mold. The additional moving device 32 has a piston rod 34 extending telescopically from the additional moving device 32 to the outside. is configured to move the additional injection device 31 back and forth according to the extension and contraction of the piston rod 34 . Piston rod 34 is part of a hydraulic cylinder. The hydraulic cylinder has a cylinder body fixed to the additional injection device 31, a piston that divides the inside of the cylinder body into a first chamber and a second chamber, and a piston rod 34 that moves together with the piston. The piston rod 34 penetrates the first chamber inside the cylinder body and protrudes outside the cylinder body. The length of the projecting portion of the piston rod 34 is called the projecting length of the piston rod 34 . As the piston advances and retreats inside the cylinder body, the projecting length of the piston rod 34 expands and contracts. The additional injection device 31 advances and retreats according to the extension and contraction of the projecting length of the piston rod 34 . With the piston rod 34 fixed to the injection molding machine 2, the additional moving device 32 presses the nozzle of the additional injection device 31 against the mold device 10 in the same manner as the moving device 400 to generate nozzle touch pressure. It also functions as a nozzle touch mechanism.

The transport unit 33 is a cart on which the additional injection device 31 and the additional movement device 32 are mounted and transported. The transport unit 33 has wheels, for example, and can be moved manually or automatically. When the additional injection unit 3 is connected to the injection molding machine 2 , the conveying section 33 is adjacent to one side of the injection molding machine 2 in the Y-axis direction, and the nozzle of the additional injection device 31 is connected to the mold device 10 . placed facing the As a result, the additional injection unit 3 is fixed to the injection molding machine 2 via the connecting portion 35 at a position where the additional injection device 31 can fill the mold with the molding material in the horizontal direction perpendicular to the opening/closing direction of the mold. . In the present embodiment, the additional injection unit 3 is arranged on the side of the injection molding machine 2 on the Y-axis negative direction side (non-operation side). side) may be arranged.

The connecting part 35 can slide the additional injection device 31 in the opening/closing direction of the mold and can be fixed at an arbitrary position in the opening/closing direction. The connecting part 35 is installed on a base 36 projecting upward from the frame Fr of the injection molding machine 2 as shown in FIG. there is

The piston rod 34 is configured to allow bending in a vertical direction (Z-axis direction) orthogonal to the mold opening/closing direction (X-axis direction) and the expansion/contraction direction (Y-axis direction) of the piston rod 34 . For example, as shown in FIG. 3, the piston rod 34 is composed of two members separated in the middle of the longitudinal direction, and these two members are fixed with a pin. The pin 34A passes through the two members along the mold opening/closing direction (X-axis direction). As a result, the piston rod 34 is strong against bending in the sliding direction, while the joint portion of the pin 34A rotates appropriately against bending in the vertical direction, thereby reducing the bending moment and transmitting vibration. can be suppressed.

FIG. 5 is a perspective view showing an example of the structure of the connecting portion 35 between the injection molding machine 2 and the additional injection unit 3. As shown in FIG. FIG. 6 is an exploded perspective view of the connecting portion 35 shown in FIG. FIG. 7 is a perspective view showing a horizontal section of the engaging portion 37 in FIG. The horizontal cross section of FIG. 7 is a cut surface of the engaging portion 37 along a horizontal plane passing through the axial center of the threaded rod 37A of the engaging portion 37. As shown in FIG.

As shown in FIGS. 5 to 7, the connecting portion 35 includes an engaging portion 37 provided at the tip of the piston rod 34, and a slide rail 38 engaging the engaging portion 37 so as to be slidable in the mold opening/closing direction. have The slide rail 38 has an upper member 38A and a lower member 38B, which will be described later in detail. A rectangular parallelepiped slit 38C parallel to the mold opening/closing direction is formed between the upper member 38A and the lower member 38B.

As shown in FIG. 7, the engaging portion 37 includes a threaded rod 37A, a first member 37B through which the threaded rod 37A penetrates, and a second member 37B attached to the first member 37B with a gap therebetween via the threaded rod 37A. and member 37C. A second member 37C is attached to one longitudinal end of the threaded rod 37A, and a lever 39 is attached to the other longitudinal end of the threaded rod 37A. Rotating the lever 39 rotates the threaded rod 37A.
The threaded rod 37A passes through a slit 38C formed between the upper member 38A and the lower member 38B in the Y-axis direction. The width (Z-axis direction dimension) of the slit 38C is slightly larger than the outer diameter of the threaded rod 37A.
The first member 37B has, for example, a rectangular parallelepiped block portion 37Ba and a pressing portion 37Bb provided on the slide rail 38 side with reference to the block portion 37Ba. The pressing portion 37Bb is formed in an isosceles trapezoidal column shape so as to protrude upward and downward as it approaches the slide rail 38, and is in contact with both the upper member 38A and the lower member 38B. A straight hole having a larger diameter than the threaded rod 37A is formed through the first member 37B, and the threaded rod 37A is inserted through the straight hole.
The second member 37C is formed, for example, in a columnar shape and abuts over both the upper member 38A and the lower member 38B. A threaded hole is provided in the second member 37C, and the threaded rod 37A is screwed into the threaded hole.
The first member 37B and the second member 37C respectively have opposing surfaces 37E and 37F at mutually opposing ends. These facing surfaces 37E and 37F are arranged parallel to each other. As shown in FIGS. 5 and 6, the engaging portion 37 is engaged with the slide rail 38 by fitting the gap 37G between the facing surfaces 37E and 37F into the slide rail 38. As shown in FIGS.

As shown in FIG. 5, the slide rail 38 clamps the gap 37G between the second member 37C and the first member 37B of the engaging portion 37 from above and below, thereby moving the engaging portion 37 as indicated by an arrow A in FIG. It is connected so as to be slidable along the mold opening/closing direction shown. The slide rail 38 has an upper member 38A fitted into the gap 37G of the engaging portion 37 from above and a lower member 38B fitted from below. The upper member 38A is rotatable as shown in FIG. 6, and by rotating the upper member 38A in a direction away from the lower member 38B, the engaging portion 37 can be easily attached to and detached from the slide rail 38. It is configured. The lower member 38B is fixed to a base 36 projecting upward from the frame Fr of the injection molding machine 2 (see FIG. 3).

A threaded rod 37A penetrating through the first member 37B is fitted into a recess 34B provided at the tip of the piston rod 34 at the end opposite to the side connected to the second member 37C. The recess 34B is provided along the extension direction of the piston rod 34 and the extension direction of the threaded rod 37A.

In this manner, the recess 34B of the piston rod 34 and the threaded rod 37A of the engaging portion 37 are fitted together, and the gap 37G between the first member 37B and the second member 37C of the engaging portion 37 is aligned with the slide rail 38. By fitting, as shown in FIG. 5, the piston rod 34 is slidably connected to the slide rail 38 via the engaging portion 37 . Thereby, the additional injection unit 3 is connected to the injection molding machine 2 via the piston rod 34 of the additional movement device 32 .

Further, by rotating the lever 39 with the second member 37C locked, the engaging portion 37 further tightens the threaded rod 37A with respect to the second member 37C, thereby connecting the second member 37C to the first member 37B. The gap 37G between the second member 37C and the first member 37B can be narrowed. As a result, the first member 37B and the second member 37C more firmly sandwich the slide rail 38 fitted in the gap 37G, and the engaging portion 37 is fixed to the slide rail 38. . Therefore, in this embodiment, the lever 39 functions as a fixing portion that fixes the engaging portion 37 and the slide rail 38 .
Note that the shape of the second member 37C is not limited to a cylindrical shape. When the shape of the second member 37C is prismatic, it is easy to fit the second member 37C into a tool such as a wrench, and it is easy to prevent rotation of the second member 37C.

5 to 7, the engagement portion 37 is fixed to the slide rail 38 and the engagement portion 37 is moved along the slide rail 38 only by rotating the lever 39. It is possible to easily switch between the movable state and the movable state. As a result, the additional injection device 31 can be slid in the mold opening/closing direction without using a special tool. Further, by rotating the upper member 38A of the slide rail 38, the engaging portion 37 can be easily attached to and detached from the slide rail 38. Therefore, for example, the additional injection unit 3 can be removed from the injection molding machine 2 and replaced with another injection molding machine. It is possible to move the additional injection unit 3 without using a special tool, such as when it is desired to move it to a place and attach it.

Effects of the injection molding unit 1 according to this embodiment will be described. The injection molding unit 1 of this embodiment includes an injection molding machine 2 having an injection device 300 for filling a mold with a molding material, an additional injection unit 3 having an additional injection device 31 for filling a mold with a molding material, and an injection and a connecting portion 35 that connects the molding machine 2 and the additional injection unit 3 . The additional injection device 31 of the additional injection unit 3 is arranged at a position where the molding material is filled from the horizontal direction orthogonal to the opening/closing direction of the mold with respect to the side surface of the mold. The connecting part 35 can slide the additional injection device 31 in the opening/closing direction of the mold and can be fixed at an arbitrary position in the opening/closing direction.

In the conventional method of performing two-material molding by adding another injection device to an injection molding machine equipped with a single injection device, when changing the mold after installing another injection device, for example, the opening and closing direction of the mold If the dimensions of the additional injection unit are different, or if the position of the nozzle of the additional injection unit and the position of the injection port of the mold are misaligned, or if it is necessary to reposition the additional injection unit, remove the additional injection unit and reposition it. After that, it was necessary to attach an additional injection device to the injection molding machine again. Therefore, there is a problem that it takes a long time to install the additional injection device, resulting in a long setup time.

On the other hand, in the injection molding unit 1 of the present embodiment, the connecting portion 35 between the injection molding machine 2 and the additional injection unit 3 allows the injection molding machine 2 to slide the additional injection device 31 in the mold opening/closing direction. Therefore, even if the mold changes and the injection port shifts in the mold opening/closing direction, the positioning of the additional injection device 31 of the additional injection unit 3 can be performed while the injection molding machine 2 and the additional injection unit 3 are connected. It can be carried out. Since this eliminates the need to remove the additional injection unit 3 from the injection molding machine 2 each time the mold is changed, the time required for mounting the additional injection device 31 can be shortened.

Further, in the injection molding unit 1 of this embodiment, the additional injection unit 3 has the additional moving device 32 that moves the additional injection device 31 in a direction orthogonal to the opening and closing direction of the mold. The additional moving device 32 has a piston rod 34 extending telescopically to the outside. It is configured to move the additional injection device 31 forward and backward according to. The piston rod 34 of the additional moving device 32 is configured to allow bending in a direction (vertical direction) perpendicular to the opening/closing direction of the mold and the expansion/contraction direction of the piston rod 34 .

With this configuration, even if vibration occurs in one of the injection molding machine 2 and the additional injection unit 3, the vibration can be absorbed by the piston rod 34, which is the only connecting part, so that the vibration is preferably transmitted to the other. can be prevented.

Further, in the injection molding unit 1 of the present embodiment, the connecting portion 35 between the injection molding machine 2 and the additional injection unit 3 includes an engaging portion 37 provided at the distal end portion of the piston rod 34 and an engaging portion 37 that is connected to the mold. and a lever 39 as a fixing portion for fixing the engaging portion 37 and the slide rail 38 .

With this configuration, the slide rail 38 installed in the injection molding machine 2 is engaged with the engaging portion 37 connected to the additional injection unit 3 side, thereby moving the additional injection unit 3 to the injection molding machine 2 . It can be slidable in the mold opening/closing direction and can be fixed at any position in the opening/closing direction.

The effects of the injection molding unit 1 according to this embodiment will be described from another point of view. The injection molding unit 1 of this embodiment includes an injection molding machine 2 having an injection device 300 for filling a mold with a molding material, an additional injection unit 3 having an additional injection device 31 for filling a mold with a molding material, and an injection and a connecting portion 35 that connects the molding machine 2 and the additional injection unit 3 . The additional injection device 31 of the additional injection unit 3 injects the molding material from the horizontal direction (Y-axis direction in this embodiment) orthogonal to the mold opening/closing direction (X-axis direction in this embodiment) with respect to the side surface of the mold. is positioned to fill the

The connecting portion 35 includes a base portion 38 fixed to the injection molding machine 2, an engaging portion 37 fixed to the additional injection unit 3, and a position of the engaging portion 37 with respect to the base portion 38 in the X-axis direction. Possibly a fixing portion 39 for fixing the engaging portion 37 to the base portion 38 . The base portion 38 forms a slit 38C parallel to the X-axis direction, and the engaging portion 37 penetrates the slit 38C of the base portion 38 in the Y-axis direction.

According to this embodiment, when the injection port formed in the Y-axis direction end surface of the mold is shifted in the X-axis direction due to a change in the mold, the base portion 38 is removed from the injection molding machine 2 or the engagement portion is removed. It is possible to adjust the position of the additional injection unit 3 with respect to the injection molding machine 2 in the X-axis direction without removing 37 from the additional injection unit 3 . Therefore, it is not necessary to remove the base portion 38 from the injection molding machine 2 or the engaging portion 37 from the additional injection unit 3 every time the mold is changed, so the work required to adjust the position of the additional injection unit 3 in the X-axis direction is eliminated. Save time.

The base portion 38 of this embodiment is a slide rail that engages the engagement portion 37 so as to be slidable in the X-axis direction. The engaging portion 37 is fitted in the slit 38C of the base portion 38 and is movable in the X-axis direction along the slit 38C. Therefore, it is possible to adjust the position of the additional injection unit 3 in the X-axis direction with respect to the injection molding machine 2 without extracting the engaging portion 37 from the slit 38C of the base portion 38, thereby shortening the work time required for the position adjustment.

The engaging portion 37 of this embodiment includes a threaded rod 37A passing through the slit 38C of the base portion 38 in the Y-axis direction, a first member 37B through which the threaded rod 37A passes, and a first member 37B spaced apart from the first member 37B in the Y-axis direction. and a second member 37C attached to the threaded rod 37A with an opening. The fixing portion 39 fixes the engaging portion 37 to the base portion 38 by sandwiching the base portion 38 from both sides in the Y-axis direction with the first member 37B and the second member 37C. Since the first member 37B and the second member 37C sandwich the base portion 38 from both sides in the Y-axis direction, the fixing of the engaging portion 37 to the base portion 38 can be stabilized.

The additional injection unit 3 of this embodiment has an additional movement device 32 that moves the additional injection device 31 in the Y-axis direction. The additional moving device 32 has a piston rod 34 extending to the outside in a telescopic manner. The additional moving device 32 is configured to advance and retract the additional injection device 31 according to the extension and contraction of the piston rod 34 . The engaging portion 37 is provided at the tip portion of the piston rod 34 . The position adjustment of the additional injection unit 3 in the X-axis direction can be performed while the engagement portion 37 and the additional injection device 31 are connected by the additional movement device 32, and the work time required for the position adjustment can be shortened.

The piston rod 34 of this embodiment is configured to allow bending in the Z-axis direction orthogonal to the X-axis direction and the Y-axis direction. With this configuration, even if vibration occurs in one of the injection molding machine 2 and the additional injection unit 3, the vibration can be absorbed by the piston rod 34, which is a connecting part in the middle, so that the vibration is preferably transmitted to the other. can be prevented.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

In the above embodiment, the connection part 35 between the injection molding machine 2 and the additional injection unit 3 is installed on the frame Fr of the injection molding machine 2, but the injection molding machine 2 and the additional injection unit 3 are connected. If possible, the connection part 35 may be installed in a portion other than the frame Fr of the injection molding machine 2 . For example, the connection part 35 can be installed on the fixed platen 110 , the mold device 10 and the tie bars 140 of the injection molding machine 2 .

In the above-described embodiment, as a specific configuration of the connecting portion 35 between the injection molding machine 2 and the additional injection unit 3, the slide rail 38 installed in the injection molding machine 2 is connected to the additional injection unit 3 side. Although the configuration in which the engaging portion 37 is engaged has been exemplified, the additional injection unit 3 can be slid in the mold opening/closing direction with respect to the injection molding machine 2 and can be fixed at any position in the opening/closing direction. , the connecting portion 35 may have other configurations.

In the above embodiment, the position of the additional injection unit 3 relative to the injection molding machine 2 is adjusted in the X-axis direction without extracting the engaging portion 37 from the slit 38C of the base portion 38. Alternatively, the position of the additional injection unit 3 in the X-axis direction with respect to the injection molding machine 2 may be adjusted after the engaging portion 37 is extracted from the slit 38C of the base portion 38 .

FIG. 8 is a perspective view showing a modification of the structure of the connecting portion between the injection molding machine and the additional injection unit. 9 is an exploded perspective view of the connecting portion shown in FIG. 8. FIG. 10 is a perspective view showing a horizontal section of the engaging portion in FIG. 8. FIG. Differences between this modified example and the above-described embodiment will be mainly described below.

37 C of 2nd members of this modification are formed in rectangular parallelepiped shape perpendicular|vertical with respect to 37 A of threaded rods unlike 37 C of 2nd members of the said embodiment. A threaded hole is provided in the second member 37C, and the threaded rod 37A is screwed into the threaded hole. By rotating the second member 37C with respect to the threaded rod 37A, the longitudinal direction of the second member 37C can be switched between the Z-axis direction (see the solid line in FIG. 9) and the X-axis direction (see the two-dot chain line in FIG. 9). can be done.

When pulling out the engaging portion 37 from the slit 38C of the base portion 38, first, the longitudinal direction of the second member 37C is the X-axis direction. At this time, the Z-axis direction dimension of the second member 37C is shorter than the Z-axis direction dimension of the slit 38C. Next, when the transfer portion 33 (see FIG. 3) is moved in the Y-axis direction or the projection length of the piston rod 34 is shortened, the tip portion of the piston rod 34 retreats. As a result, the engaging portion 37 provided at the tip of the piston rod 34 retreats, and the second member 37C of the engaging portion 37 is pulled out from the slit 38C of the base portion 38 . In this state, the position of the additional injection unit 3 in the X-axis direction can be adjusted with respect to the injection molding machine 2 by moving the transport section 33 in the X-axis direction.

After adjusting the position of the additional injection unit 3 with respect to the injection molding machine 2 in the X-axis direction, the conveying portion 33 is moved in the Y-axis direction, or the projection length of the piston rod 34 is extended. advances. As a result, the engaging portion 37 provided at the tip of the piston rod 34 advances, and the second member 37C of the engaging portion 37 is inserted into the slit 38C of the base portion 38 . The longitudinal direction of the second member 37C is the X-axis direction so that the second member 37C is inserted into the slit 38C. The Z-axis dimension of the second member 37C is shorter than the Z-axis dimension of the slit 38C.

After that, the longitudinal direction of the second member 37C is switched from the X-axis direction to the Z-axis direction. Thereby, the Z-axis direction dimension of the second member 37C becomes longer than the Z-axis direction dimension of the slit 38C. Next, by rotating the lever 39 with the second member 37C locked, the threaded rod 37A is tightened with respect to the second member 37C, the second member 37C approaches the first member 37B, and the second member 37C approaches the first member 37B. A gap 37G between the member 37C and the first member 37B is narrowed. As a result, the first member 37B and the second member 37C firmly sandwich the base portion 38 from both sides in the Y-axis direction, and the engagement portion 37 is fixed to the slide rail 38 . At this time, the Z-axis dimension of the second member 37C is longer than the Z-axis dimension of the slit 38C, and the second member 37C abuts over both the upper member 38A and the lower member 38B.

As described above, according to this modified example, it is possible to extract the engagement portion 37 from the slit 38C of the base portion 38 and then adjust the position of the additional injection unit 3 with respect to the injection molding machine 2 in the X-axis direction. can. Also in this modified example, the position of the additional injection unit 3 in the X-axis direction with respect to the injection molding machine 2 is adjusted without extracting the engaging portion 37 from the slit 38C of the base portion 38, as in the above-described embodiment. is also possible.

In this modification, the upper member 38A of the base portion 38 may be non-rotatable. The engaging portion 37 can be extracted from the slit 38C of the base portion 38 without rotating the upper member 38A of the base portion 38. As shown in FIG. When the additional injection unit 3 is to be removed from the injection molding machine 2 and moved to another injection molding machine for installation, the additional injection unit 3 can be moved without using a special tool.

A first member 37B may be fixed to the piston rod 34, a threaded hole may be formed in the first member 37B, and the threaded rod 37A may be screwed into the threaded hole. A second member 37C is fixed to one end of the threaded rod 37A. By rotating the lever 39 provided at the other end of the threaded rod 37A, the relative position of the second member 37C to the first member 37B can be changed to narrow the gap 37G between the first member 37B and the second member 37C. can be spread out. Therefore, it is possible to fix the engagement portion 37 to the base portion 38 and release the fixation. Further, when the lever 39 is rotated, the longitudinal direction of the second member 37C can be changed, and the direction of the second member 37C can be aligned with the direction of the slit 38C of the base portion 38. FIG. After that, the engaging portion 37 (specifically, the second member 37C) can be extracted from the slit 38C of the base portion 38, and the additional injection unit 3 can be removed from the injection molding machine 2.

1 injection molding unit 2 injection molding machine 3 additional injection unit 31 additional injection device 32 additional moving device 34 piston rod 35 connecting portion 37 engaging portion 37A screw rod 37B first member 37C second member 38 slide rail 39 lever (fixing portion)

Claims (8)

an injection molding machine having an injection device for filling a molding material into a mold;
an additional injection unit for filling the mold with a molding material; and an additional injection unit that is movable to a location of another injection molding machine and has a transport section that carries and transports the additional injection device;
a connecting part that connects the injection molding machine and the additional injection unit,
The additional injection device of the additional injection unit is arranged at a position where the molding material is filled from a horizontal direction orthogonal to the opening and closing direction of the mold with respect to the side surface of the mold,
The additional injection unit is connected to the injection molding machine via the connecting portion,
The connecting part is capable of sliding the additional injection device in the opening/closing direction of the mold and fixing it at any position in the opening/closing direction.
injection molding unit. an injection molding machine having an injection device for filling a molding material into a mold;
an additional injection unit having an additional injection device for filling the mold with molding material;
a connecting part that connects the injection molding machine and the additional injection unit,
The additional injection device of the additional injection unit is arranged at a position where the molding material is filled from a horizontal direction orthogonal to the opening and closing direction of the mold with respect to the side surface of the mold,
the connecting part is capable of sliding the additional injection device in the opening/closing direction of the mold and fixing it at an arbitrary position in the opening/closing direction;
The additional injection unit has an additional movement device for moving the additional injection device in a direction orthogonal to the opening and closing direction of the mold,
The additional movement device has a piston rod that extends to the outside in a telescopic manner. configured to move the additional injection device forward and backward accordingly,
The piston rod is configured to allow bending in a direction orthogonal to the opening and closing direction of the mold and the expansion and contraction direction of the piston rod,
injection molding unit. The connecting portion includes an engaging portion provided at the tip of the piston rod, a slide rail engaging the engaging portion so as to be slidable in the opening and closing direction, and fixing the engaging portion and the slide rail. a fixed part;
3. An injection molding unit according to claim 2. an injection molding machine having an injection device for filling a molding material into a mold;
an additional injection unit for filling the mold with a molding material; and an additional injection unit that is movable to a location of another injection molding machine and has a transport section that carries and transports the additional injection device;
a connecting part that connects the injection molding machine and the additional injection unit,
The additional injection device of the additional injection unit is arranged at a position where the molding material is filled from the horizontal direction perpendicular to the opening and closing direction of the mold with respect to the side surface of the mold,
The additional injection unit is connected to the injection molding machine via the connecting portion,
The connecting part is
a base fixed to the injection molding machine;
an engaging portion fixed to the additional injection unit;
an injection molding unit that fixes the engaging portion to the base portion such that the position of the engaging portion relative to the base portion in the mold opening/closing direction can be changed. 5. The injection molding unit according to claim 4, wherein the base portion is a slide rail that slidably engages the engaging portion in the mold opening/closing direction. an injection molding machine having an injection device for filling a molding material into a mold;
an additional injection unit having an additional injection device for filling the mold with molding material;
a connecting part that connects the injection molding machine and the additional injection unit,
The additional injection device of the additional injection unit is arranged at a position where the molding material is filled from the horizontal direction perpendicular to the opening and closing direction of the mold with respect to the side surface of the mold,
The connecting part is
a base fixed to the injection molding machine;
an engaging portion fixed to the additional injection unit;
a fixing portion that fixes the engaging portion to the base portion so that the position of the engaging portion with respect to the base portion in the mold opening/closing direction can be changed;
The engaging portion includes a threaded rod passing through a slit in the base portion parallel to the mold opening/closing direction in the horizontal direction, a first member through which the threaded rod passes, and a gap in the horizontal direction from the first member. and a second member attached to the threaded rod with an opening,
The injection molding unit, wherein the fixing portion fixes the engaging portion to the base portion by sandwiching the base portion from both sides in the horizontal direction with the first member and the second member. the additional injection unit has an additional movement device for moving the additional injection device in the horizontal direction;
The additional movement device has a piston rod that extends to the outside in a telescopic manner. configured to move the additional injection device forward and backward by
The injection molding unit according to any one of claims 4 to 6, wherein the engaging portion is provided at the tip of the piston rod. an injection molding machine having an injection device for filling a molding material into a mold;
an additional injection unit having an additional injection device for filling the mold with molding material;
a connecting part that connects the injection molding machine and the additional injection unit,
The additional injection device of the additional injection unit is arranged at a position where the molding material is filled from the horizontal direction perpendicular to the opening and closing direction of the mold with respect to the side surface of the mold,
The connecting part is
a base fixed to the injection molding machine;
an engaging portion fixed to the additional injection unit;
a fixing portion that fixes the engaging portion to the base portion so that the position of the engaging portion with respect to the base portion in the mold opening/closing direction can be changed;
the additional injection unit has an additional movement device for moving the additional injection device in the horizontal direction;
The additional movement device has a piston rod that extends to the outside in a telescopic manner. configured to move the additional injection device forward and backward by
The engaging portion is provided at the tip of the piston rod,
The injection molding unit, wherein the piston rod is configured to allow bending in a direction orthogonal to the mold opening/closing direction and the expansion/contraction direction of the piston rod.

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