KR100813636B1 - Device for clamping a die - Google Patents

Abstract

The present invention relates to a mold clamping device capable of adjusting the position of the moving die plate to initiate the extrusion operation of the molded article, the mold clamping device is connected to the extrusion pin installed so as to be projected to the movable mold and the mold opening and closing direction (A1 and A2) The movable plate 53 held by the movable die plate 51 so as to be movable, and the movable plate 53 is installed on the movable die plate 51 and the movable plate 53 can be released at a predetermined position with respect to the movable die plate 51. Mold opening and closing directions A1 and A2 of the movable plate 53 when the movable die plate 51 is moved to the open position PD of a predetermined type and is installed in the air cylinder 210 and the link housing 21 which are constrained. ) Restrains the movement of the mold and restricts only the movement of the movable plate 53 from which the restraint by the air cylinder 210 is released with respect to the moving die plate 51 which is further directed from the mold opening position PD to the mold opening direction. Air cylinder (53), air cylinder (210 Position adjustment mechanisms 250, 251, 252 and 253 that can change the position of the moving die plate 51 in the direction of the mold opening and closing.

Description

Device for clamping a die}             

1 is a configuration diagram showing an example of a mold clamping device to which the present invention is applied;

2 is a view for explaining the operation of the mold clamping apparatus of FIG.

3 is a plan view showing a configuration around a link housing and a moving die plate of a mold clamping apparatus according to an embodiment of the present invention;

4 is a rear view of the link housing 21;

5 is a cross-sectional view of the moving die plate 51 viewed in the direction of an arrow D of FIG.

6 is a cross-sectional view of the link housing 21 viewed in the direction of an arrow E in FIG. 3,

7 is a view showing a state in which the moving die plate 51 is moved to the mold opening limit position PA;

8 is a view showing a state in which the moving die plate 51 is further moved from the mold opening limit position PA to the extrusion position PB.

9 is a side view showing a state in which the movable plate 53 is fixed to the link housing 21;

Fig. 10 is a plan view showing the configuration around the link housing and the moving die plate of the mold clamping apparatus according to the second embodiment of the present invention.

11 is a view for explaining the operation of the mold clamping apparatus according to the second embodiment of the present invention;

12 is a view for explaining the operation in FIG. 11;

FIG. 13 is a view for explaining the operation in FIG. 12;

14 is a view for explaining the operation in FIG. 13;

15 is a view for explaining a modification of the mold clamping apparatus according to the second embodiment of the present invention;

Fig. 16 is a plan view showing the configuration around the link housing and the moving die plate of the mold clamping apparatus according to the third embodiment of the present invention.

17 is a view for explaining the operation of the mold clamping apparatus according to the third embodiment of the present invention;

18 is a view for explaining the operation in FIG. 17;

19 is a plan view showing a configuration around a link housing and a moving die plate of the mold clamping apparatus according to the fourth embodiment of the present invention;

20 is a view for explaining the operation of the mold clamping apparatus according to the fourth embodiment of the present invention;

21 is a view for explaining the operation in FIG. 20;

22 is a cross-sectional view showing an example of the configuration of a conventional mold clamping device.

<Description of the code>

1---clamping device, 21---link housing,

24---fixing member, 25---air cylinder,

51---moving die plate, 52---moving mold,

53---movable plate, 91---fixed die plate,

92---Fixed mold, 95---Tie bar,

100---base, 110---toggle clamping device,

210---Air cylinder, 211---Piston rod.

The present invention relates to a mold clamping apparatus provided with an extrusion mechanism for extruding a molded article from a mold applied to a die casting apparatus or a plastic injection molding machine, for example.

In an injection molding machine for molding a resin such as plastic, an extrusion mechanism is provided in the mold clamping device to separate the molded product from the mold. A mold clamping device is a device which tightens a metal mold | die by a predetermined clamping force in the state which closed and closed a metal mold | die by opening and closing of a metal mold | die. In the extrusion mechanism of the mold clamping device, for example, the extrusion pin is installed in the mold of the mold so that the extrusion pin can be projected, and after the product is molded, the extrusion pin is protruded while the mold is opened to take out the product.

By the way, in the related art, the extrusion pin of the extrusion mechanism is driven by an actuator independent of an actuator for opening and closing the mold, which results in a complicated structure of the mold clamping device, resulting in an increase in manufacturing cost.

Techniques for performing the opening and closing operation of the mold and the operation of the extrusion mechanism are disclosed in, for example, Japanese Patent Laid-Open No. 4-2416.

As shown in Fig. 22, the mold clamping apparatus disclosed in Japanese Patent Laid-Open No. 4-2416 discloses a stationary mold 174 and a movable mold 175, and after the injection molding and cooling, the movable mold 175 Is removed from the stationary mold 174 by the moving die plate 110, and an extrusion mechanism for extruding the molded article by the extrusion pin 117 is provided. Specifically, it is arrange | positioned inside the crank arm 115 which advances the moving die plate 110 back and forth, the mold opening / closing motor 107 which drives this crank arm 115, and the moving die plate 110, and is a spring. When the extrusion plate 111 is pushed elastically in the retraction direction by the 112 and the extrusion plate 111 is retracted to a predetermined position, the tip reaches the extrusion plate 111 so that the extrusion plate 111 The extrusion bar 103 which prevents further retreat is provided.
In this mold clamping device, when the moving mold 175 is opened by driving the crank arm 115 to move the moving die plate 110, the extrusion plate 111 touches the extrusion bar 103 to extrude the plate 111. The retreat of When the moving die plate 110 is further retracted while the extrusion plate 111 is stopped, the extrusion pin 117 protrudes with respect to the moving mold 175 while the spring 112 is compressed. As a result, the molded article is extruded from the moving mold 175. When the crank arm 115 is moved to advance the moving die plate 110, the extrusion plate 111 is dropped from the extrusion bar 103, and the extrusion pin 117 is moved by the elastic force of the spring 112. 175 is immersed and returned to the home position.

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By the way, a molding apparatus having an extrusion mechanism for operating the extrusion pin 117 in conjunction with the opening and closing operation of the mold as described above may be applied to a die casting apparatus by replacing with a plastic injection molding machine.

However, in the die cast apparatus, molten metal such as aluminum alloy is used as the molding material. For this reason, a part of the molten metal injected into the mold may be scattered to the moving die plate 110 and attached to the spring 112 provided in the moving die plate 110. If the molten metal adheres to the spring 112 and coagulates, the spring 112 may not stretch normally.

In the above-described extrusion mechanism, the extrusion pin 117, which has moved relative to the moving die plate 110, is fixed with the moving mold 175 after the extrusion operation of the product is completed, for example, when the spring 112 is not stretched normally. There is a possibility that the extrusion pin 117 protrudes into the moving mold 175 without returning to the home position in the state where the mold 174 is closed.

If molding is performed while the extrusion pin 117 protrudes with respect to the moving mold 175, there is a risk of molding failure. In particular, if the extrusion pin 117 protrudes when the shim is inserted into the mold, the mold is formed. This may be damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a mold clamping apparatus capable of reliably operating an extrusion pin in connection with opening and closing operations of a mold.

A mold clamping device according to a first aspect of the present invention includes a fixed die plate for holding a fixed mold, a moving die plate for holding a moving mold against the fixed mold, and moving the moving die plate in a mold opening and closing direction. It is a clamping device which has a link housing provided with a driving mechanism for supplying a clamping force, and performs opening and closing of the mold, and is connected to an extrusion pin installed to be projected to the movable mold, and can move in the mold opening and closing direction. A movable member held on the movable die plate so as to be provided on the movable die plate, the first restraining means restraining the movable member to be released from a predetermined position with respect to the movable die plate, and on the link housing. The movable die plate when the movable die plate is moved to an open position of a predetermined type. Second restraining means for restraining the movement of the ash opening and closing direction and restricting only movement of the movable member whose restraint by the first restraining means is released to the movable die plate from the open position of the mold to the mold opening direction again; And restraint position adjusting means capable of changing the position of the moving die plate when restraint of the movable member is started by the second restraining means.

Preferably, the restraint position adjusting means includes a position adjusting mechanism capable of changing the position of the first restraining means with respect to the moving die plate along the mold opening and closing direction.

A mold clamping device according to a second aspect of the present invention includes a fixed die plate for holding a fixed mold, a moving die plate for holding a moving mold against the fixed mold, and a movement of the moving die plate in a mold opening and closing direction. A mold clamping device having a link housing provided with a driving mechanism for supplying a clamping force, and configured to perform opening and closing of the mold, the mold clamping device being connected to an extrusion pin installed to be protruding with respect to the movable mold to move relative to the movable die plate. A movable member held in a predetermined position so that the movable die plate is moved to an open position of a predetermined mold to restrain movement of the movable member in a mold opening and closing direction, and Movement of the movable member relative to the moving die plate from the open position back towards the mold opening direction Restraining means for restricting the bay and restraining position adjusting means capable of changing the position of the moving die plate when restraint of the movable member is started by the restraining means.

Preferably, the restraint position adjusting means has a position adjusting mechanism capable of changing the position of the restraining means with respect to the link housing along the mold opening and closing direction.

The movable member includes a member to be restrained by the restraining means, and the restraining position adjusting means includes a position adjusting mechanism capable of changing the position of the restraint member with respect to the movable member in a mold opening and closing direction. It may be a structure.

In the mold clamping apparatus according to the first aspect of the present invention, since the movable member connected with the extrusion pin is constrained by the first restraining means until the movable die plate moves to the open position of the predetermined mold, the movable member is attached to the movable die plate. The position is firmly in place. When the movable die plate moves to the open position of the predetermined mold, the movable member is restricted in the mold opening and closing direction by the second restricting means. Just before the relative movement of the movable member and the movable die plate, the restraint by the first restricting means is released, and the extrusion pin protrudes from the movable mold by the relative movement occurring between the movable member and the movable die plate, thereby extruding the molded article. .

When the extrusion operation of the molded article is completed and the moving die plate returns to the predetermined mold opening position again, the movable member returns to the fixed position with respect to the moving die plate. The movable member in this state is restrained again by the first restricting means.

Therefore, the clamping operation is not performed in the state where the movable member is out of position and the extrusion pin protrudes with respect to the moving mold.

Further, in the clamping device of the present invention, the extrusion position of the molded article can be arbitrarily changed by changing the position of the moving die plate when the restraint of the movable member is started by the restraint position adjusting means.

In the mold clamping apparatus according to the second aspect of the present invention, the movable member connected to the extrusion pin is restricted in the mold opening and closing direction by the restraining means when the movable die plate moves to the opening position of the predetermined mold.

When the moving die plate further moves in the mold opening direction from the predetermined opening position of the mold, only the moving die plate moves while the movable member is stopped. As a result, the extrusion pin protrudes with respect to the moving mold by the relative movement occurring between the movable member and the moving die plate, thereby extruding the molded article.

Further, in the clamping device of the present invention, the extrusion position of the molded article can be arbitrarily changed by changing the position of the moving die plate when the restraint of the movable member is started by the restraint position adjusting means.

Embodiments of the present invention will be described below with reference to the drawings.

First embodiment

Fig. 1 is a configuration diagram showing an example of a mold clamping device to which the present invention is applied. The mold clamping device 1 of Fig. 1 is applied to a die of a die cast apparatus, for example.

In FIG. 1, the clamping device 1 includes a base 100, a fixed die plate 91 fixed on the base 100, a fixed mold 92 attached to the fixed die plate 91, and a fixed portion. A movable die plate 51 provided to move on the base portion 100 opposite the die plate 91, a movable mold 52 attached to the movable die plate 51 so as to face the fixed mold 92, and Toggle body mechanism connecting the link housing 21 and the movable die plate 51 and the link housing 21 connected by the fixed die plate 91 and the tie bar 95 with the movable die plate 51 interposed therebetween. 109 is provided.

The fixed die plate 91 is fixed to the base 100. The link housing 21 is usually fixed to the tie bar 95, but moves relative to the tie bar 95 when adjusting the height of the die with mold change. The moving die plate 51 is provided so that it can move on a base part.

The link housing 21 and the fixed die plate 91 are connected by tie bars 95 passing through the moving die plate 51, and four tie bars 95 are usually provided.

The toggle body mechanism 109 connecting the link housing 21 and the moving die plate 51 is provided with two sets of upper and lower link systems 110 in FIG. 1, but only one configuration is shown in detail. Each link system is composed of a plurality of links. Each link system includes an angled first link 110-1 and a straight link 110-2. One end of the first link 110-1 is attached to the link housing 21, and the other end of the first link 110-1 is attached to the crosshead 105. One end of the second link 110-2 is crushed to the first link 110-1 at a position between the link housing 21 and the extraction point for the crosshead 105, and the other end of the second link 110-2 is moved die plate 51. I'm stuck on.

The crosshead 105 chucked to the first link of the toggle mechanism 109 moves along the screw shaft 106 in the direction of the arrow A1 or A2, so that the toggle mechanism 109 is operated to thereby operate the link housing 21. And the moving die plate 51 is approached or spaced apart.

The screw shaft 106 is driven by a servomotor installed in the link housing 21 as described later, and the crosshead 105 screwed thereto by the rotation of the screw shaft 106 is indicated by an arrow A1 or A2. Direction).

As shown in FIG. 1, the toggle mechanism 109 operates according to the movement of the crosshead 105 in the direction of the arrow A2, and the moving die plate 51 is spaced apart from the link housing 21. In the mold closing direction, the fixed mold 92 and the movable mold 52 are closed, and when the crosshead 105 is moved in the direction of the arrow A2, the tie bar 95 is tensioned. By this action, the fixed mold 92 and the movable mold 52 are tightened.

In the state where the movable mold 52 and the stationary mold 92 are clamped, a metal such as an aluminum alloy is formed in a cavity formed by the movable mold 52 and the stationary mold 92 by an injection device (not shown). The molten metal is molded by injection molding.

On the other hand, in forming the die cast product and opening the movable mold 52 to take out the die cast product, as shown in FIG. 2, the moving die is moved in accordance with the movement in the direction of the arrow A1 of the crosshead 105. The plate 51 moves in the direction (die opening direction) approaching the link housing 21 via the link 110 of the toggle mechanism 109, so that the movable mold 52 is connected to the stationary mold 92. Open to At this time, the die cast product in the movable mold 52 is extruded by the extrusion mechanism described later.

FIG. 3 is a plan view showing the configuration around the link housing 21 and the moving die plate of the mold clamping apparatus according to the embodiment of the present invention, and FIG. 4 shows the link housing 21 with the arrow C shown in FIG. It is the rear view seen from) direction. FIG. 5 is a rear view showing a portion of the moving die plate 51 viewed in the direction of the arrow D in FIG. 3, and FIG. 6 shows the link housing 21 in the direction of the arrow E in FIG. 3. It is a front view showing a part by cross section.

In Fig. 3, a mold clamping motor 30 and a die height adjusting motor 41 are provided on both sides of the link housing 21, and as shown in Fig. 4, the mold clamping motor 30 is shown. The pulley 30a is fixed to the output shaft of the gear, and the gear 42 is fixed to the output shaft of the motor 41 for die height adjustment.

As shown in FIG. 4, the screw shaft 106 is freely supported in the center of the link housing 21 along the mold opening and closing directions A1 and A2, and the rear end of the screw shaft 106 is provided. The pulley 106a is fixed. The pulley 30a fixed to the output shaft of the pulley 106a and the clamping servomotor 30 described above is wound with a belt 31 having a gear, so that the rotational force of the clamping servomotor 30 is a screw shaft ( 106).

On the rear side of the link housing 21, a ring gear 43 arranged concentrically with the screw shaft 106 is supported so as to be free to rotate. The ring gear 43 is a motor for adjusting the height of the die 41 Is engaged with the gear 42 fixed to the output shaft.

Gears are formed on the outer periphery of the four corners of the link housing 21, and the tie bar nuts 46 screwed to the threaded portions of the outer bar of the tie bar 95 are freely held in rotation, and these tie bar nuts ( 46 are respectively engaged with the ring gear 43.

The rotational force of the die height adjustment motor 41 is transmitted by the tooth 42 and the ring gear 43 to the tie bar nut 46 so that the link housing 21 moves along the axial direction of the tie bar 95. do.

On the other hand, the distance between the movable die plate 51 and the fixed die plate 91 when the movable mold 52 and the fixed mold 92 are in contact with each other and no clamping force is generated therebetween is called a die height. The die height can be adjusted by adjusting the position of the link housing 21 in correspondence with the height of the movable mold 52 and the fixed mold 92.

In FIG. 3, the cross head 105 is screwed to the screw shaft 106, and the cross head 105 moves in the mold opening / closing direction A1 or A2 by driving the screw shaft 106.

Two guide bars 23 provided along the mold opening and closing direction A1 or A2 provided in the link housing 21 are inserted into both side portions 105a of the crosshead 105.

The rear end of the guide bar 23 is fixed to the link housing 21, and the front end is supported by the support 22 extending along the mold opening / closing direction A1 or A2 formed in the link housing 21. As shown in FIG.

At the top and bottom of the crosshead 105, as shown in FIGS. 3 and 6, a link 110-of the toggle mechanism 109 connecting the movable die plate 51 and the link housing 21 described above. 1; see FIG. 1 and FIG. 2, the connecting portion 105b is formed.

Between the tip of the screw shaft 106 and the crosshead 105 is provided a cover 26, which is freely stretched to enclose the screw shaft 106, to prevent foreign matter such as metal molten metal from adhering to the screw shaft 106. It is supposed to.

As shown in Figs. 3 and 6, fixing members 24 are provided on the front end side of the support part 22 of the link housing 21, and these fixing members 24 have a mold opening and closing direction ( An insertion hole 24a is formed along A1 or A2.

The air cylinder 25 is provided in the upper part of these fixing members 24, and the air cylinder 25 is one embodiment of the actuator of this invention.

In these air cylinders 25, the built-in piston rod can be settled in the insertion hole 24a of the said fixing member 24. Moreover, the air cylinder 25 is arrange | positioned so that a piston rod may orthogonally cross the central axis of the insertion hole 24a.

The movable die plate 51 is provided with the movable plate 53 on the opposite side to which the movable mold 52 is hold | maintained, This movable plate 53 is one Embodiment of the movable member of this invention.

As shown in Figs. 3 and 5, the movable plate 53 is formed by opening and closing directions A1 and A2 by guide rods 55 which are set up on the side of the main body portion 51a of the moving die plate 51, respectively. It is held so that it can move freely.

A fitting portion 53a fitted to the guide rod 55 is formed on one surface of the movable plate 53, so that the fitting portion 53a is fitted to the guide rod 55.

The stopper 56 which consists of double nuts is fixed to the front-end | tip part of the guide rod 55, and the movable plate 53 is not separated by this stopper 56. As shown in FIG.

The coil spring 60 is inserted into the guide rod 55 between the movable plate 53 and the opposing surface of the movable die plate 51. The coil spring 60 is one of the pressing means of the present invention. Example.

The coil spring 60 pushes the movable plate 53 elastically toward the mold opening direction A1, so that the movable plate 53 is a stopper position 56 at which the movable plate 53 is the moving limit position of the mold opening direction A1 by this pressing force. It is kept in the position where it touches). That is, the position which touches this stopper 56 is a fixed position of the movable plate 53.

On the surface where the movable plate 53 faces the link housing 21, a hook member inserted into the insertion hole 24a of the fixing member 24 provided at the tip of the support part 22 of the link housing 21 ( 58 is provided corresponding to the fixing member 24.

The hook member 58 is provided with a locking recess 59 in which the piston rod front end of the air cylinder 25 is hooked to the front end.

In addition, the flange-shaped stopper portion 58a formed on the shaft portion of the hook member 58 is fixed when the tip portion of the hook member 58 is inserted into the insertion hole 24a of the fixing member 24. It is for setting the position of the hook member 58 with respect to the dragon member 24.

The moving mold 52 is provided with a plurality of extruded pins 63 so that they can be projected to the inner surface of the mold of the moving mold 52.

These extruded pins 63 are connected to an extruded plate 68 arranged behind the moving mold 52.

The extruded plate 68 is held so as to be movable in the mold opening and closing directions A1 and A2 by the guide pin 65 fixed behind the moving mold 52.

In addition, a plurality of coil springs 64 are provided between the extruded plate 68 and the movable mold 52 so as to exert a force in a direction separating the extruded plate 68 and the movable mold 52. .

The extruded plate 68 is connected to the movable plate 53 by a plurality of connecting rods 54 passing through the inside of the moving die plate 51. As the movable plate 53 and the extruded plate 68 are connected by the connecting rod 54 in this manner, the movable plate 53 and the extrusion pin 63 are connected to each other, and the movable die plate of the movable plate 53 is provided. In conjunction with the relative movement with respect to 51, the extrusion pin 63 is raised against the inner surface of the mold of the moving mold 52.

Next, the operation of the mold clamping device 1 having the above configuration will be described.

In the mold clamping apparatus 1 in the state shown in FIG. 1, the stationary mold 92 and the movable mold 52 are in a mold clamping state.

In this state, the clamping servomotor 30 is driven to rotate the screw shaft 106 in a predetermined direction, thereby moving the crosshead 105 in the mold opening direction A1.

When the crosshead 105 is moved in the mold opening direction A1, the moving die plate 51 is moved toward the link housing 21 by the toggle mechanism 109 described above, as shown in FIG. 7. The stationary mold 92 is opened with respect to the movable mold 52.

At this time, the die cast product W formed in the cavity formed by the stationary mold 92 and the movable mold 52 moves together with the movable mold 52, as shown in FIG.

When the moving die plate 51 moves to the mold opening limit position PA, which is a predetermined mold opening position, the fixing member 24 provided with the hook member 58 provided on the movable plate 53 is provided on the link housing 21. Is inserted into the insertion hole 24a. Thus, the movable plate 53 is connected to the link housing 21 via the fixing member 24 and the hook member 58.

Here, FIG. 9 is a side view showing a state in which the movable plate 53 is fixed to the link housing 21. In the lower half of FIG. 9, the movable die plate 51 is moved to the mold opening limit position PA. Indicates.

As shown in FIG. 9, when the hook member 58 provided in the movable plate 53 is inserted into the insertion hole 24a of the fixing member 24, the air cylinder 25 is driven to drive the air cylinder 25. The piston rod (25a) of the () is projected to be caught by the locking recess 59 of the hook member (58).

Thereby, the movable plate 53 is caught by the link housing 21 and fixed, and the movement of the mold opening-closing directions A1 and A2 of the movable plate 53 is restrained.

Then, from the above state, the crosshead 105 is further moved in the mold opening direction A1, and as shown in FIG. 8, the moving die plate 51 is moved from the mold opening limit position PA to the mold opening direction A1. To the extrusion position (PB).

The upper half of FIG. 9 has shown the state which moved the moving die plate 51 further from the mold opening limit position PA to the extrusion position PB of the mold opening direction A1.

Since the movable plate 53 is restrained by the link housing 21, even if the movable die plate 51 further moves in the mold opening direction A1, the movement of the movable plate 53 is prevented. Thus, relative movement occurs between the moving die plate 51 and the movable plate 53 with respect to the mold opening and closing directions A1 and A2.

As can be seen in FIG. 9, when relative movement occurs between the moving die plate 51 and the movable plate 53, the coil spring 60 is compressed.

In addition, as shown in FIG. 8, when only the movement of the mold opening direction A1 of the movable plate 53 is prevented, the extruded plate 68 provided behind the moving mold 52 burns the coil spring 64. Approach the moving mold 52 against the force. When the extrusion plate 68 approaches the moving mold 52, the extrusion pin 63 protrudes from the moving mold 52 to push out the die cast product W in the moving mold 52.

As a result, separation of the die cast product W from the mold is completed.

Subsequently, the rotational direction of the mold servomotor 30 is reversed from the state described above, and the moving die plate 51 is moved from the extrusion position PB toward the mold opening limit position PA. At this time, the movable plate 53 is in a state of being restrained with respect to the link housing 21.

When the moving die plate 51 moves to the mold opening limit position PA, it becomes the state shown in FIG. 7, and the movable plate 53 contacts the stopper 56 of the tip of the guide rod 55, and moves the moving die plate ( Return to the correct position for 51). In addition, the extrusion pin 63 is immersed from the mold inner surface of the movable mold 52 and the coil spring 60 compressed is also restored.

In this state, since the movable plate 53 is not only restrained with respect to the link housing 21 but also in the correct position with respect to the movable die plate 51, the movable die plate 51 is in the mold closing direction A2. Movement to is blocked.

That is, in the mold opening state, the moving die plate 51 does not move in the mold closing direction A2 until the fixing by the air cylinder 25 is released, so that the moving die plate 51 moves even if the mold servomotor 30 malfunctions. The die plate 51 can be prevented from moving in the mold closing direction A2.

When the mold is re-executed from this state, after detecting the mold signal to the control device of the mold clamping device 1, the air cylinder 25 is driven to immerse the piston rod 25a against the hook member 59. To release the fixing operation of the movable plate 53.

As described above, according to the mold clamping apparatus 1 of the present embodiment, extrusion of the die-cast product from the moving mold 52 is performed in conjunction with the opening operation of the mold of the moving die plate 51 without requiring an extrusion actuator. You can run it.

In addition, in the mold clamping apparatus 1 of the present embodiment, the moving die plate 51 is moved to the mold opening limit position PA, and then moved to the extrusion position PB to extrude the die cast product from the moving mold 52. After the operation, the movable die plate 51 is held in the mold opening limit position PA in order to maintain the restraint of the movable plate 53 until the movable die plate 51 is returned to the mold opening limit position PA again. ), The extrusion pin 63 can be reliably immersed from the mold inner surface of the moving mold 52. That is, in this embodiment, since the extrusion pin 63 which performed the extrusion operation is performed by the movement of the moving die plate 51, without immersing the moving mold 52 by the elastic force of the coil spring 60, Even if the coil spring 60 is not properly stretched or contracted due to the fact that the molten metal is fixed to the coil spring 60 or the like, the extrusion pin 63 can be reliably returned to the proper position.

Furthermore, in this embodiment, the movable die plate 51 at the mold opening limit position PA is erroneously moved in the mold closing direction A2 by preventing the movable plate 53 from being restrained by the link housing 21. The safety mechanism can be reliably prevented, and the movable mold 52 and the fixed mold 92, which are in the open state, can be cleaned safely and securely, and the movable mold 52 and the fixed mold can be secured. Damage to the mold 92 can be prevented. Moreover, since a safety mechanism and an extrusion mechanism can be used together, the structure of an apparatus can be further simplified.

On the other hand, the present invention is not limited to the embodiment described above.

In the above-described embodiment, the case where the air cylinder 25 is used as the actuator for restraining the movable plate 53 has been described. However, for example, a movable plate 53 such as a hydraulic cylinder, a motor, and a strong electromagnet is attached to the link housing. What is necessary is just a means which can restrain responsively.

In addition, in the above-described embodiment, the case of the coil spring has been described as one embodiment of the pressurizing means of the present invention. In addition, the movable plate 53 is directed toward the home position using, for example, the attraction force or the repulsive force of the magnet. It can also be set as the structure which pushes, or it can be set as the structure which pushes compressed air to the fixed position by blowing the movable plate 53.

In the above-described embodiment, the air cylinder 25, the fixing member 24, and the hook member 58 are provided in plural places from the viewpoint of clamping force, balance, and the like, but may be unitary. In addition, although the air cylinder 25 and the fixing member 24 were installed in the link housing 21 and the movable plate 53 was provided with the hook member 58, the air cylinder 25 and the fixing member 24 were installed. Can be provided on the movable plate 53, and the hook member 58 is attached to the link housing 21.

Second embodiment

Fig. 10 is a plan view showing the configuration around the link housing and the moving die plate of the mold clamping apparatus according to the second embodiment of the present invention.

The difference between the mold clamping apparatus according to the present embodiment and the mold clamping apparatus according to the first embodiment described above is only a part of the configuration in the moving die plate 51, and the other configuration is the same. The same code | symbol is attached | subjected and demonstrated.

In FIG. 10, the fixing member 24 and the air cylinder 25 which were mentioned above are provided in the front-end | tip part of the support part 22 of the link housing 21, These comprise the 2nd binding means of this invention. .

The movable plate 53 is freely installed on the movable die plate 51 along the guide rod 55 in the mold opening and closing directions A1 and A2. In FIG. 10, the movable plate 53 is a stopper 56. It is located in the right position in contact with.

A plurality of hook members 201 are provided on the side surface of the link housing 21 of the movable plate 53. At the distal end of the hook member 201, a locking concave portion 202 to which the piston rod 25a of the air cylinder 25 is engaged is formed. This hook member 201 has a slightly different shape from the hook member 58 in the first embodiment, but functions the same as the hook member 58.

A locking member 203 is provided on both sides of the movable plate 53, and a locking recess 203a is formed on the outer surface of the locking member 203.

The air cylinder 210 is provided in the both sides of the moving die plate 51 in the position which opposes the locking member 203 of the movable plate 53 which is a fixed position, respectively.

The tip portion 211a of the piston rod 211 embedded in the air cylinder 210 is fitted to the locking recess 203a of the locking member 203 by extending the piston rod 211 from the air cylinder 210. It is supposed to be.

When the tip portion 211a of the piston rod 211 is caught by the locking recess 203a of the locking member 203, the movable plate 53 is restrained from the movement of the moving die plate 51 in the correct position. That is, the mold opening / closing directions A1 and A2 cannot be moved with respect to the moving die plate 51.

Next, the operation of the clamping device having the above configuration will be described.

In the mold clamping device in the state shown in FIG. 10, the stationary mold 92 and the movable mold 52 are in the mold state (see FIGS. 1 and 8, not shown in FIG. 10), and the movable die plate 51 is It is in place.

In this state, the air cylinder 210 is driven to protrude the piston rod 211 to restrain the movable plate 53 with respect to the moving die plate 51.

From this state, as in the case of the first embodiment, when the moving die plate 51 is moved in the mold opening direction A1, as shown in FIG. 11, the moving die plate 51 is in the mold opening limit position PA. The tip end portion of the hook member 201 is inserted into the insertion hole 24a of the clamping fixing member 24.

In this state, the air cylinder 25 is operated to latch the piston rod of the air cylinder 25 to the locking recess 202 of the hook member 201 and fix it. Thus, the movable plate 53 is restrained with respect to the link housing 21.

The movable plate 53 is constrained to the link housing 21 by the air cylinder 25, and then the piston rod 211 of the air cylinder 210 is immersed as shown in FIG. Release the restraint on the moving die plate 51. As a result, the movable plate 53 can move relative to the moving die plate 51.

Next, as shown in Fig. 13, the moving die plate 51 is further moved from the mold opening limit position PA toward the mold opening direction A1 to the extrusion position PB.

As a result, the movable plate 53 moves relative to the moving die plate 51 in the mold closing direction A2, so that extrusion of the die cast product by the extrusion pin is performed. In this state, the movable plate 53 is displaced from the fixed position of the moving die plate 51.

When the extrusion of the die cast product is completed, the moving die plate 51 is moved back to the mold opening limit position PA, as shown in FIG. Thereby, the movable plate 53 returns to the home position of the moving die plate 51, and the extrusion pin 63 immerses reliably from the inner surface of the mold of the moving mold 52 (refer FIG. 7 and FIG. 8). , Not shown in FIG. 10). Thus, the piston rod 211 of the air cylinder 210 is extended to resume the restraint of the movable die plate 51 of the movable plate 53.

In this state, since the movable plate 53 is located in the fixed position with respect to the movable die plate 51 while being restrained with respect to the link housing 21, the movable die plate 51 moves in the mold closing direction A2. Movement is prevented. That is, in the open state of the mold which is not formed, the moving die plate 51 does not move in the mold closing direction A2 until the fixing by the air cylinder 25 is released, so that the mold servomotor 30 is held. It is possible to prevent the moving die plate 51 from moving in the mold closing direction A2 even if the malfunction occurs.

In the case of performing mold clamping again from this state, after detecting the mold clamping signal to the control device of the clamping apparatus 1, the air cylinder 25 is driven to immerse the piston rod 25a against the hook member 58. Release the lock.

At this time, the fixing of the movable plate 53 by the air cylinder 210 is not released. Therefore, the movable plate 53 is reliably positioned at the correct position of the moving die plate 51 until the next extrusion operation.

According to this embodiment as described above, the extrusion pin 63 is fixed by clamping the movable plate 53 at all times by the air cylinder 210 except when the movable plate 53 and the movable die plate 51 are moved relative to each other. Can be reliably immersed from the inner surface of the mold of the moving mold 52 (see FIGS. 7 and 8), so that the position of the extrusion pin 63 can be accurately managed.

In addition, according to the present embodiment, since the safety mechanism and the extrusion mechanism can be used as in the first embodiment described above, the configuration of the apparatus can be simplified.

In the above-described embodiment, the case where the air cylinders 25 and 210 are used as the actuator has been described. However, for example, an actuator having a relatively high responsiveness such as a hydraulic cylinder, a motor, a strong electromagnet or the like may be used.

In the embodiment described above, the air cylinders 25 and 210 are provided at a plurality of locations, but may be provided at a single location.

Furthermore, in the above-described embodiment, the air cylinders 25 and 210 are separately installed, but as shown in FIG.

In Fig. 15A, the movable plate 53 is provided with an air cylinder 301 in which the piston rod 302 can protrude from both ends.

In addition, a part of the moving die plate 51 is provided with a locking recess 304 that can catch the piston rod 302 of the air cylinder 301.

On the other hand, the link housing 21 is provided with a locking member 305 having a locking recess 305a in which the piston rod 302 of the air cylinder 301 can be caught.

If the state shown in FIG. 15A is made into a clamped state, the movable plate 53 can be fixed to the fixed position of the moving die plate 51 by the air cylinder 301. FIG.

When the moving die plate 51 is moved to the mold opening limit position as shown in Fig. 15B, the piston rod 302 of the air cylinder 301 is projected in the reverse direction to be caught by the locking member 305. . Thereby, the movable plate 53 is restrained by the link housing 21. At the same time, the restrained state of the movable die plate 51 of the movable plate 53 is released.

In this way, the restraint of the movement from the fixed position of the movable die plate 51 of the movable plate 53 and the restraint of the movement of the movable plate 53 in the mold opening and closing direction moved to the mold opening limit position can be selectively executed. By setting it as such, the number of air cylinders used can be reduced, and production cost can be reduced.

Third embodiment

Fig. 16 is a plan view showing the configuration around the link housing and the moving die plate of the mold clamping apparatus according to the third embodiment of the present invention.

In the first and second embodiments described above, the extrusion operation of the molded article cannot be performed unless the moving die plate 51 is moved to the mold opening limit position PA. For example, when a molded article is thin, it can extrude, without moving the moving die plate 51 to mold opening limit position PA. Further, if the moving die plate 51 is always moved to the mold opening limit position PA, there is also a disadvantage that the cycle time becomes long.

In this embodiment, the extrusion operation is possible even when the moving die plate 51 is not always moved to the mold opening limit position PA, that is, the position of the moving die plate 51 when the restraint of the movable plate is started can be changed. Describe the configuration.

The mold clamping apparatus according to the present embodiment and the mold clamping apparatus according to the second embodiment described above have basically the same configuration, and the difference is only a part of the configuration in the moving die plate 51, and the other configurations are the same. Accordingly, the same components and the same basic functional components will be described with the same reference numerals.

In FIG. 16, the air cylinder 25 mentioned above is provided in the front-end | tip part of the support part 22 of the link housing 21. As shown in FIG. The movable plate 53 is provided with a plurality of hook members 201 extending in the mold opening and closing directions A1 and A2. At the distal end of the hook member 201, a locking concave portion 202 to which the piston rod 25a of the air cylinder 25 is engaged is formed. The hook member 201 has the same function as the hook member 201 of the second embodiment although the shape is different.

The plurality of air cylinders 210 are not fixed to the moving die plate 51 but fixed to the slider 250, respectively.

A ball screw 251 is fitted to one end of the slider 250. The ball screw 251 is connected to the rotating shaft 252a of the servomotor 252 whose one end is in a released state and the other end is fixed to the moving die plate 51. The ball screw 251 is disposed along the mold opening and closing directions A1 and A2 and is supported to be rotatable.

The guide rod 253 is inserted into the other end side of the slider 250. One end of the guide rod 253 is in a released state, and the other end thereof is fixed to the moving die plate 51 by the fixing member 254. The guide rod 253 is disposed along the mold opening and closing directions A1 and A2. The slider 250 is supported by the guide rod 253 so that it can move freely along the mold opening-closing direction A1 and A2.

The slider 250 is movable along the ball screw 251 and the guide rod 253 in the mold opening and closing directions A1 and A2. When the servomotor 252 is rotated, the rotational force of the servomotor 252 is converted into a linear motion force, and the slider 250 moves in the mold opening / closing directions A1 and A2. By performing the rotation position control of the servomotor 252, the position of the mold opening-closing direction A1 and A2 of the slider 250 can be determined.

In FIG. 16, the movable plate 53 is free to move along the guide rod 55, and the movable plate 53 is fitted with a tip portion 211a of the piston rod 211 of the air cylinder 210. The engaging recess 53a to be matched is formed. This locking recess 53a has the same function as the locking recess 203a of the locking member 203 described in the second embodiment.

When the piston rod 211 is extended and fitted to the locking recess 53a of the movable plate 53, the movable plate 53 is restrained from the movement of the movable die plate 51 in the correct position. That is, the movement of the mold opening and closing directions A1 and A2 with respect to the moving die plate 51 becomes impossible.

The restraint position of the movable plate 53 is determined by the positions of the mold opening and closing directions A1 and A2 of the air cylinder 210. That is, by positioning the slider 250 at predetermined positions in the mold opening and closing directions A1 and A2, the restraint position of the movable plate 53 can be adjusted to the predetermined position.

On the other hand, the slider 250, the ball screw 251, the servomotor 252 and the guide rod 253 constitute the position adjusting mechanism of the present invention.

Next, an example of the operation of the mold clamping device configured as described above will be described with reference to FIGS. 17 and 18.

When the position of the moving die plate 51 which starts the extrusion operation of a molded article is to be changed from the above-mentioned mold opening limit position PA, as shown in FIG. 17, the mold opening direction from the moving die plate 51 is shown. Towards A1, the slider 250 is moved by a predetermined distance La. On the other hand, the movable plate 53 is in a state of being restrained by the air cylinder 210. The distance La is a change amount of the position of the moving die plate 51 at which the extrusion operation of the molded article is started.

When the slider 250 is moved by a predetermined distance La, the position with respect to the moving die plate 51 of the movable plate 53 is changed.

In Fig. 17, the movable mold 52 and the stationary mold 92 are positioned in the mold closing position of the movable die plate 51 in the state in which the mold is closed (see Figs. 1 and 8 and not shown in Fig. 17). If it is set as (PC), when molding of a molded article is completed, the moving die plate 51 will move toward the mold opening direction A1 from the closed position PC of a mold.

Next, as shown in FIG. 18, the moving die plate 51 is positioned to the extrusion operation start position PD just before the mold opening limit position PA. This extrusion operation start position PD is a position separated by the distance La from the mold opening limit position PA toward the mold closing direction A2, as shown in FIG.

After the moving die plate 51 is positioned at the extrusion operation start position PD, the piston rod 25a of the air cylinder 25 is extended so that the piston rod 25a is caught by the hook member 201 ( 202).

After the piston rod 25a is fitted to the locking recess 202 of the hook member 201, the piston rod 211 of the air cylinder 210 is shortened to the air cylinder 210 of the movable plate 53. The restraint is released.

The subsequent operation is exactly the same as in the second embodiment described above, and the moving die plate 51 is further moved from the extrusion operation start position PD in the mold opening direction A1 to perform extrusion of the molded article.

As described above, according to the present embodiment, since the starting position of the extrusion operation for starting the extrusion operation of the molded article can be changed, the mold opening is carried out from the closed position PC of the die by the moving die plate 51 for each extrusion operation of the molded article. There is no need to move to the limit position PA.

As a result, the cycle time of the die cast apparatus can be shortened.

In addition, since the position of the air cylinder 210 as the first restraining means can be adjusted by an actuator such as a servo motor, for example, the specification of the mold is input to the controller and the start position of the extrusion operation is made corresponding to the specification of the mold. It can also be set as an automatic adjustment.

On the other hand, in the present embodiment, the position of the air cylinder 210 as the first restricting means is configured by the actuator, but for example, the position of manually adjusting the position of the air cylinder 21 with respect to the moving die plate 51. It can also be set as the structure provided with the adjustment mechanism.

Fourth embodiment

Fig. 19 is a plan view showing the configuration around the link housing and the moving die plate of the mold clamping apparatus according to the fourth embodiment of the present invention.

In the first and second embodiments described above, the extrusion operation of the molded article cannot be performed unless the moving die plate 51 is moved to the mold opening limit position PA. For example, when a molded article is thin, it can extrude, without moving the moving die plate 51 to mold opening limit position PA. In addition, there is also a disadvantage that the cycle time becomes long when the moving die plate 51 is always moved to the mold opening limit position PA.

In this embodiment, the extrusion operation is possible even when the moving die plate 51 is not always moved to the mold opening limit position PA, that is, the position of the moving die plate 51 when the restraint of the movable plate is started can be changed. Describe the configuration.

The mold clamping apparatus according to the present embodiment and the mold clamping apparatus according to the first embodiment described above have basically the same configuration, except for the configuration of a part of the link housing 21 and the moving die plate 51. The other configuration is the same. Accordingly, the same components and the same basic functions are described with the same reference numerals, and the same components are denoted by the same reference numerals.

In FIG. 19, the plurality of air cylinders 25 on the link housing 21 side are not fixed to the support portion 22 of the link housing 21 but fixed to the slider 250, respectively.

A ball screw 251 is fitted to one end side of the slider 250. One end of the ball screw 251 is in a released state, and the other end is connected to the rotation shaft 252a of the servomotor 252 fixed to the link housing 21. The ball screw 251 is disposed along the mold opening and closing directions A1 and A2 and is supported to be rotatable.

The guide rod 253 is inserted into the other end side of the slider 250. One end of this guide rod 253 is in a released state, and the other end thereof is fixed to the moving die plate 51 by a fixing member 254. The guide rod 253 is disposed along the mold opening and closing directions A1 and A2. The slider 250 is supported by the guide rod 253 so that it can move freely along the mold opening-closing direction A1 and A2.

The slider 250 is movable along the ball screw 251 and the guide rod 253 in the mold opening and closing directions A1 and A2. When the servomotor 252 is rotated, the rotational force of the servomotor 252 is converted into a linear force, and the slider 250 moves in the mold opening / closing directions A1 and A2. By performing rotation position control of the servomotor 252, positioning of the mold opening / closing directions A1 and A2 of the slider 250 is made.

In FIG. 19, the movable plate 53 is free to move along the guide rod 55. The coil spring 60 is inserted into the guide rod 55 between the movable plate 53 and the opposing surface of the movable die plate 51.

The coil spring 60 is configured to elastically push the movable plate 53 toward the mold opening direction A1, and the movable plate 53 moves in the mold opening direction A1 by this pressing force. It is held in the position where it touches the phosphor stopper 56. That is, the position which touched this stopper 56 turns into the fixed position of the movable plate 53.

A plurality of hook members 58 are provided in the movable plate 53 along the mold opening and closing directions A1 and A2. At the distal end of the hook member 58, a locking recess 59 is formed in which the piston rod 25a of the air cylinder 25 is engaged. The hook member 58 has the same function as the hook member 58 of the first embodiment although the shape is different.

Moreover, the hook member 58 is provided with the screw part 58a in the shaft part, and this screw part 58a is screwed into the screw hole formed in the movable plate 53, and it is being fixed to the movable plate 53 by it. do.

Therefore, the rotation of the hook member 58 allows the hook member 58 to be positioned relative to the movable plate 53. That is, by rotating the hook member 58, the position of the mold opening-closing directions A1 and A2 with respect to the movable plate 53 of the locking recess 59 can be adjusted.

On the other hand, the slider 250, the ball screw 251, the servomotor 252 and the guide rod 253 constitute the position adjusting mechanism of the present invention.

The screw hole in which the screw portion 58a formed on the hook member 58 and the screw portion 58a formed on the movable plate 53 are screwed together constitutes the position adjusting mechanism of the present invention.

Next, an example of the operation of the mold clamping device configured as described above will be described with reference to FIGS. 20 and 21.

In the case where it is desired to change the position of the moving die plate 51 at which the extrusion operation of the molded article is started from the mold opening limit position PA described above, the slider 250 is moved to the link housing 21 as shown in FIG. To the mold closing direction A2 by a predetermined distance La. This distance La is an amount of change in the position of the moving die plate 51 to start the extrusion operation of the molded article.

When the slider 250 is moved by the distance La, the position with respect to the moving die plate 51 of the air cylinder 53 is changed.

In Fig. 20, the movable die 52 and the stationary mold 92 are placed in the closed position (see Figs. 1 and 8, not shown in Fig. 20) of the movable die plate 51, and the closed position ( PC), when molding of a molded article is completed, the moving die plate 51 will move toward the mold opening direction A1 from the closed position PC of a mold.

Then, as shown in FIG. 21, the moving die plate 51 is positioned to the extrusion operation start position PD just before the mold opening limit position PA. This extrusion operation start position PD is a position which advanced toward the mold closing direction A2 by the distance La from the mold opening limit position PA, as shown in FIG.

After the moving die plate 51 is positioned at the extrusion operation start position PD, the piston rod 25a of the air cylinder 25 is extended, so that the piston rod 25a is locked by the hook member 58 ( 59). As a result, the movement of the movable plate 53 is restricted.

The subsequent operation is completely similar to the first embodiment described above, whereby the moving die plate 51 is further moved from the extrusion start position PD to the mold opening direction A1, so that extrusion of the molded article can be performed. do.

According to this embodiment as described above, since the starting position of the extrusion operation for starting the extrusion operation of the molded article can be changed, the movable die plate 51 is opened from the closed position PC of the mold for each extrusion operation of the molded article. There is no need to move to position PA.

As a result, the cycle time of the die cast apparatus can be shortened.

In addition, since the position of the air cylinder 25 as a restraining means can be adjusted by an actuator such as a servomotor, for example, a specification of a mold is input to a control device, and the start position of the extrusion operation is automatically adjusted in accordance with the specification of the mold. It can also be set to.

In addition, in this embodiment, only the case where the position of the air cylinder 25 of the link housing 21 side was adjusted was demonstrated, but the position adjustment with respect to the movable plate 53 is performed by rotating the hook member 58. As shown in FIG. By this, the extrusion operation start position PD can be adjusted.

In addition, by adjusting the position of both the hook member 58 and the air cylinder 25, the adjustment range of the extrusion operation start position PD can be expanded.

And it is also possible to set it as the structure which only adjusts the hook member 58, without performing the position adjustment of the air cylinder 25. FIG. In this case, the air cylinder 25 is fixed to the link housing side as in the first or second embodiment, so that the slider 250, the ball screw 251, the servomotor 252 and the guide rod 253 are fixed. May be omitted.

On the other hand, in the present embodiment, the position of the air cylinder 25 as the restraining means is configured by the actuator, but the position adjusting mechanism for manually adjusting the position of the air cylinder 25 relative to the moving die plate 51, for example. It can also be configured to install.

In this embodiment, the movable plate 53 is held at a predetermined position by elastically pushing the movable plate 53 toward the mold opening direction A1 by the coil spring 60. Similarly to the second embodiment, the air cylinder 210 may be provided as the first restraining means so as to constrain the movable plate 53 to a predetermined position with respect to the moving die plate 51.

In addition, although the mold clamping apparatus of each embodiment described above was applied to the mold of the die cast apparatus, the mold clamping apparatus of the present invention can be applied not only to the die cast apparatus but also to other molding apparatus such as a plastic injection molding machine. have.

Moreover, although the above-mentioned clamping apparatus demonstrated using a toggle mechanism as a drive mechanism which drives a moving die plate, this invention is applicable also to a clamping apparatus of a direct pressure type | mold.

According to the mold clamping apparatus of the present invention, the extrusion pin can be reliably operated in conjunction with the opening and closing operation of the mold.

Moreover, according to the mold clamping apparatus of this invention, the structure of a mold clamping apparatus can be further simplified, and manufacturing cost can be reduced.

Claims (5)

A link housing provided with a fixed die plate for holding a fixed mold, a movable die plate for holding a movable mold against the fixed mold, and a drive mechanism for supplying a clamp force while moving the movable die plate in a mold opening and closing direction. And a clamping device for opening and closing the mold, A movable member held in the movable die plate so as to move in a mold opening and closing direction, connected to an extrusion pin installed to be projected with respect to the movable mold; First restraining means provided on the moving die plate to restrain the movable member to be released from a predetermined position with respect to the moving die plate; Installed in the link housing, to restrain movement of the movable member in the mold opening and closing direction when the movable die plate is moved to a predetermined mold opening position, and to the movable die plate further directed from the mold opening position to the mold opening direction. Second restraining means for regulating only movement of the movable member whose restraint by the first restraining means is released; And a clamping position adjusting means capable of changing the position of the moving die plate when the restraining of the movable member is started by the second restricting means. The clamping device according to claim 1, wherein the restraint position adjusting means includes a position adjusting mechanism capable of changing a position of the first restraining means with respect to the moving die plate along a mold opening and closing direction. A link housing provided with a fixed die plate for holding a fixed mold, a movable die plate for holding a movable mold against the fixed mold, and a drive mechanism for supplying a clamp force while moving the movable die plate in a mold opening and closing direction. And a clamping device for opening and closing the mold, A movable member held in a predetermined position so as to be movable with respect to the movable die plate, connected to an extrusion pin installed to be projected with respect to the movable mold; It is provided in the link housing, and when the movable die plate is moved to a predetermined mold opening position, the movement of the movable member in the mold opening and closing direction is restrained, and the movement die plate is further directed from the mold opening position toward the mold opening direction. Restraining means for regulating only movement of the movable member relative to the movable member; And a clamping position adjusting means capable of changing the position of the moving die plate when the restraint of the movable member is started by the restraining means. 4. The clamping device according to claim 3, wherein the restraint position adjusting means includes a position adjusting mechanism capable of changing the position of the restraining means with respect to the link housing along a mold opening and closing direction. 5. The movable member according to claim 3 or 4, wherein the movable member includes a member to be restrained by the restraining means, and the restraint position adjusting means is configured to open and close the position of the member to the movable member. A clamping device comprising a position adjustment mechanism that can be changed along a direction.

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