JPH0237539Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mold clamping device for an injection molding machine, a die casting machine, etc. (hereinafter referred to as a molding machine).

As shown in FIG. 10, the retraction limit of the movable die plate in a conventional mold clamping device is determined by fixing a stop bar 2 to the mold clamping cylinder 1 in the moving direction of the movable die plate 4 with two lock nuts 3, and It was regulated by the movable die plate 4 colliding with each other. However, in this method, when the mold is replaced, the mold thickness usually changes, so the mold clamping stroke also changes.According to this change, the position of the stop bar 2 is adjusted by loosening the lock nut 3, and the safety door (not shown) is adjusted. The related positions of the hooks that operate the safety gate also had to be adjusted, making the work complicated and reducing productivity. Furthermore, in order to cooperate with the safety gate and prevent the movement of the movable die plate 4 when the movable die plate 4 abuts against the stop bar 2, a hole 5 for abutting the stop bar 2 in the movable die plate 4 is provided. When the stop bar was inserted into the hole 5, fingers, etc., were sometimes inserted and injured.

The present invention eliminates these drawbacks, and its purpose is to provide a mold clamping device for a molding machine that has good operability and high safety.

In order to achieve such an object, in the present invention, a fixed die plate, a movable die plate, a mold clamping cylinder, or a toggle plate are supported by communicating through holes formed in each of them, and have a plurality of grooves A in the axial direction. a pair of split spacers that engage or disengage from the groove A of the stop bar to stop the retreating movable die plate at a predetermined groove A position; The stop bar is slidably fitted into the groove B formed in the direction and the ridges of the plurality of grooves A, and the pair of split spacers are attached to make the split spacer movable in the axial direction of the stop bar. One end of the spacer is attached so that it can rotate up and down around a pin, the other end serves as a guide that can slide or rotate along a dog provided on the safety door, and the middle part is attached to the groove B. A hook is guided so as to be engaged with or disengaged from the groove A of the stop bar, and a hook is provided on one side of the safety door so that the hook disengages from the groove of the stop bar when engaged with the guide portion. dog, and a stepped hole which is provided in a direction perpendicular to the groove B of the movable die plate and has a large diameter part and a small diameter part from the mold mounting surface side toward the anti-mold mounting surface, and the same stepped hole. a stepped pin that is slidably provided in the hole, is fitted into and supported by the large diameter part and the small diameter part, and has a middle diameter part facing the groove B in the middle between the large diameter part and the small diameter part; , a spring that presses from the end face of the large diameter part of the stepped pin, and when the moving die plate does not abut the split spacer, the small diameter part of the stepped pin is moved by the spring to attach the die plate against the mold. When the hook is brought into contact with the large diameter portion of the stepped pin, the hook is disengaged from the groove A, and the movable die plate abuts against the split spacer, the stepped pin is pressed against the pressing force of the spring. A mold clamping device for an injection molding machine, etc. consists of a hook up/down control device in which a stepped pin is pushed into a hole and the middle diameter portion contacts the hook to align the hook with groove A. With this configuration, when the movable die plate retreats to the retraction limit, the movable die plate collides with the split spacer fitted into one of the plurality of grooves provided in the stop bar, and is forcibly moved. The movement of the moving plate is stopped. Further, when the safety door is open, the hook is located in the groove of the stop bar to prevent movement of the movable die plate, and only when the safety door is closed, the movable die plate is allowed to move, thereby ensuring safety.

The present invention will be explained below with reference to figures showing one embodiment. In FIG. 1, the mold clamping cylinder or toggle plate 11, the movable die plate 12, and the stationary die plate 13 are arranged in a straight line with holes 14.
to 16 are open. A stop bar 18 having a plurality of circumferential grooves A17 arranged at equal intervals in the axial direction is inserted into the holes 14 to 16, and a threaded portion 18A provided at one end thereof.
It is fixed to the stationary die plate 13 by screwing a set of nuts 19 thereon. The guide cylinder 21 shown in FIGS. 2 and 3 is slidably inserted onto the projections 20 on both sides of the groove A17, and the hole 23 of the projection 22 provided on one side of the guide cylinder 21 is inserted into the hole 23 of the projection 22 provided on one side of the guide cylinder 21. The split spacers 24 are supported by the guide tube 21 by inserting pins 26 (see FIG. 5) that pass through the holes 25 of the pair of split spacers 24 also shown in FIG. The pair of split spacers 24 are held together by a known tensioning tool 27, and when they are put together, their inner holes 24A sandwich the groove A17 of the stop bar 18. Note that the guide tube 21 may not be provided, but the holes 25 of the pair of split spacers 24 may be overlapped, and the pin 26 may be inserted into the hole 25.

There is a hole 15 above the hole 15 of the movable die plate 12.
A groove B28 is provided which crosses the groove B28 in a right angle direction.
28 is a groove A1 of the stop bar 18 when the movable die plate 12 retreats and collides with the split spacer 24.
7. There is a hook 29 guided in the groove B28.
is a pin 30 attached to one end as shown in FIG.
It can be rotated up and down around the stop bar 18.
It is configured to fit into or separate from the groove A17. A rotatable roller 31 is attached to the other end of the hook 29, and the roller 31 is attached to the safety door 32.
The hook 29 is moved up and down depending on the position of the dog 33.

When the movable die plate 12 is movable, that is, when the safety door 32 is closed, the hook 29 moves between the roller 31 and the dog 33 as shown by the dotted line in FIG.
in the upper position through the groove A of the stop bar 18.
He has been withdrawn since 17. On the other hand, when the safety door 32 is open, the roller 31 is removed from the dog 33, so the hook 29 is removed as shown by the solid line in FIG.
is located at the lower position and is fitted into the groove A17.
Note that the dog 33 is attached to the safety door 32 as shown in FIG.
The seat portion 33A is guided into the groove 32A of the machine, and is fixed with a bolt 34 and a washer 35 at an arbitrary position in the longitudinal direction of the machine.

The dog 33 is normally not long enough to correspond to the entire stroke of the movable die plate 12, and therefore, when the movable die plate 12 moves slightly forward from the retraction limit, the lower surface of the roller 31 of the hook 29 will move toward the dog 33.
In other words, the hook 29 is also in the lower position and fits into the groove A17 of the stop bar 18, so that the movable die plate 12 cannot move forward.

As shown in FIGS. 8 and 9, 37 in FIG. 6 is a large diameter portion extending from the mold mounting surface side provided perpendicularly to the groove B28 of the movable die plate 12 toward the side opposite to the mold mounting surface. This is a stepped pin that is fitted into and supported by the small diameter part and the small diameter part, respectively, and has three steps, with the middle diameter part facing the groove B28 between the large diameter part and the small diameter part.
A spring 39 is provided between the large diameter end face of the stepped pin 37 and the lid 38, and while the movable die plate 12 does not abut against the split spacer 24, the stepped pin 37 is moved from the large diameter end face. Since it is constantly pressed by the spring 39, the small diameter part protrudes from the opposite mold mounting surface of the movable die plate 12 as shown in FIG. 9, and the hook 29 contacts the large diameter part of the stepped pin 37.
When the hook 29 disengages from the groove A17 and assumes the upper position as shown by the broken line in FIG. 6, and the movable die plate 12 reaches its retreat limit and collides with the spacer 24, the position is as shown in FIG. Then, the stepped pin 37 is pushed into the stepped hole 36 against the pressing force of the spring 39, and the middle diameter portion contacts the hook 29, and the hook 29 is in the lower position shown in FIG. 6 and engaged with the groove A17. This is a hook up/down control device that controls the up and down position of the matching hook 29.

Next, the operation of the device of the present invention will be explained. When the resin in both molds cools and solidifies, the moving die plate 1
A split spacer 24 is attached in advance to the groove A17 corresponding to the retraction limit of No. 2 using a tensioning tool 27 and a guide tube 21. Note that fine adjustment of the backward limit position is performed by loosening the nut 19 and adjusting the position of the stop bar 18. Therefore, when the movable die plate 12 is retracted to the retraction limit, it collides with the split spacer 24 and is forcibly stopped.

When the safety door 32 is closed after the molded product is removed from the movable mold, the roller 31 of the hook 29 rides on the dog 33 of the safety door 32, so the hook 29 is in the upper position as shown by the dotted line in FIG. 1
It comes off from the groove A17 of No.8. If a command to move the moving die plate 12 forward is issued here, the moving die plate 1
2 moves forward. When the movable die plate 12 moves forward slightly, the roller 31 comes off the dog 33, but at this point the movable die plate 12 is attached to the split spacer 2.
4, the stepped pin 37 is in the left position as shown in FIG.
, and prevents the hook 29 from being in the lower position. Therefore, the moving die plate 12 continues to move forward.

In this invention, when adjusting the stroke amount of the movable die plate due to mold replacement, remove the tensioning tool of the split spacer, move the split spacer to another groove of the stop bar, and then integrate the split spacer with the tensioning tool again. good. Moreover, since this work also works on the safety gate at the same time, the operation is easy and the operation time is short, increasing productivity. Furthermore, since the stop bar passes through the constantly moving die plate, the present invention has the advantage that fingers will not be caught by the stop bar, resulting in high safety.

[Brief explanation of the drawing]

Figures 1 to 9 all show one embodiment of the present invention; Figure 1 is a vertical sectional view of the main part, Figure 2 is a side view of the guide tube, and Figure 3 is 3-3 in Figure 2. line cross section,
Fig. 4 is a side view of the split spacer, Fig. 5 is a sectional view taken along line 5-5 in Fig. 1, Fig. 6 is a sectional view taken along line 6-6 in Fig. 1, and Fig. 7 is a Z section in Fig. 6. The enlarged views, FIGS. 8 and 9, are sectional views taken along line 8-9 in FIG. 5 at different points in time, and FIG. 10 is a partial sectional view of the conventional example. 11... Mold clamping cylinder, 12... Moving die plate, 13... Fixed die plate, 14, 15,
16... Through hole, 17... Groove A, 18... Stop bar, 24... Split spacer, 28... Groove B, 2
9...futsuk, 32...safety door, 33...dog.

Claims (1)

[Claims for Utility Model Registration] A stop bar that is supported by communicating through holes formed in each of a fixed die plate, a movable die plate, a mold clamping cylinder, or a toggle plate, and has a plurality of grooves A in the axial direction; a pair of split spacers that engage with or disengage from the groove A of the stop bar to stop the moving plate retreating at a predetermined groove A position; and a groove B formed in a direction perpendicular to the through hole of the moving plate. , a spacer that is slidably fitted into the peaks of the plurality of grooves A, and to which the pair of split spacers is attached so that the split spacers are movable in the axial direction of the stop bar; and one end is centered on the pin. The other end is a guide part that can slide or rotate along a dog provided on the safety door, and the middle part is attached to the groove B.
a hook that is guided by the guide portion and is adapted to engage or disengage from the groove A of the stop bar; and a hook provided on one side of the safety door such that the hook disengages from the groove A of the stop bar when engaged with the guide portion. a mounting hole formed in a direction perpendicular to the groove B of the movable plate and having a large diameter part and a small diameter part from the mold mounting surface side toward the opposite mold mounting surface side; It is slidably provided in the attached hole, and is fitted and supported by the large diameter part and the small diameter part, respectively, and the middle between the large diameter part and the small diameter part is a medium diameter part facing the groove B. It consists of a stepped pin and a spring that presses against the end face of the large diameter part of the stepped pin. When the moving plate does not abut against the split spacer, the spring causes the small diameter part of the stepped pin to move against the moving die plate. When the hook protrudes from the mold mounting surface and comes into contact with the large diameter part of the stepped pin, and the hook is disengaged from the groove A and the movable die plate collides with the split spacer, the pressing force of the spring A mold clamping device for an injection molding machine, etc., comprising a hook up-and-down control device that pushes a stepped pin into a stepped hole against the resistance and fits the hook into a groove A with its middle diameter portion contacting the hook.