JPH11114999A - Automatic opening and closing device of mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the automatic opening and closing device of molds, which is excellent in the reliability of actions and in which no trouble develops by a method wherein the structure of the device is so simplified that no spring is used. SOLUTION: This automatic opening and closing device of injection molds consists of a base holder 1, a locking member 5 which holds engagers 4 transversely movably at both side positions of an inserting part allowing to take out of and put into a vertically passing through portion 2 provided in the base holder 1, and a locking bar 7 allowing to take out of and put into a vertically passing through portion 6 provided in the locking member 5. In addition, at both side surfaces of the vertically passing through portion 2 of the base holder 1, the engaging recessed parts 8 of the engagers 4 are provided so as to keep the engaged state of the engagers with the engaging recessed parts 8 in the state that the locking bar 7 is inserted in the vertically pressing through portion 6 of the locking member 5. The structure of the automatic opening and closing device is so simplified that the use of a spring becomes unnecessary, resulting in realizing the excellent reliability of actions and, at the same time, no occurrence of trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for automatically connecting and disconnecting components of a mold in an injection mold for a synthetic resin product.

[0002]

2. Description of the Related Art A mold for injection-molding a synthetic resin product is constituted by laminating a plurality of mold plates, and injecting a molten resin from a spool bush into a molding space formed on an overlapping surface of the mold plates. To form the product.

[0003] In the above-mentioned injection mold, the molds must be fixed in an overlapped state at the time of molding a product, and the mold plates must be separated in a certain order at the time of taking out the product. Must.

That is, when a product is taken out, first, a runner portion generated between the spool bush and the product is pulled from the product, and thereafter, a template of the product portion is separated.
This is because there is little danger of deforming the product.

[0005] In an injection molding die, in order to fix each superimposed mold plate and automatically obtain a separation in a certain order at the time of taking out a product, a conventional automatic opening / closing device attached to both sides of the die has been used. The device is used.

FIG. 4 shows an example of an automatic opening / closing device conventionally used, in which a base holder 31 fixed to a movable mold plate 21 and a lock member 3 fixed to a fixed mold plate 22.
2 and a lock bar 33 attached to a stripper template 23 provided with a spool bush. A lock claw 34 is provided on an inner side surface of the base holder 31 and a spring 38 for urging the lock claw 34 to project elasticity. The locking member 32 is provided with an engaging claw 35 pivotally supported by a pin 37, and a spring 36 for urging the engaging claw 35 to constantly rotate elastically in a direction away from the locking claw 34. 2
When the base members 31 and the lock member 32 overlap with each other when the base members 2 and 23 overlap, the lock bar 33 is inserted into the base holder 31 and the lock member 32, and the engaging claw 35 is moved to the lock claw 3.
4 to fix the template plates 21, 22 and 23.

When the mold plates 21, 22, 23 are released, the lock bars 33 come out of the base holder 31 and the lock member 32 after the mold plates 21, 22 separate from the mold plate 23 in a locked state. In this state, the engagement claw 35 is disengaged from the lock claw 34 due to the elasticity of the spring 36, and the fixed-side mold plate 22 is separated leaving the movable-side mold plate 21, whereby the runner portion is pulled from the product. After the release, the product can be taken out.

[0008]

By the way, the above-mentioned conventional automatic opening / closing device uses a spring 3 to release the locked state.
6 and 38, the structure becomes complicated, and the elasticity of the springs 36 and 38 changes over time, which lowers the reliability of operation and may cause a failure.

Further, when the mold is opened and closed, the lock claws 34 and the engagement claws 35 collide with each other, so that the collision portions are likely to be damaged,
When the lock bar 33 comes out, the engaging claw 35 is pressed by the spring 36, so that there is a problem that an impact is generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mold automatic opening / closing apparatus which simplifies the structure, eliminates the use of a spring, is excellent in operation reliability, has excellent durability, and does not cause failure or impact. Is to provide.

[0011]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, an insertion portion can be freely inserted into and removed from a base holder and a vertically penetrating portion provided in the base holder. A lock member that holds the engagement element so as to be able to move laterally at positions on both sides of the insertion portion, and a lock bar that can be freely inserted into and removed from the vertically penetrating portion provided on the lock member. The engagement recesses of the engagement element are provided on both side surfaces of the portion, and the lock bar is configured to maintain the engagement state of the engagement element with the engagement recess when inserted into the upper and lower penetrating portions of the lock member. The configuration is adopted.

Here, the base holder is formed in a flat U-shape, the inside of which is an upper and lower penetrating portion, and an engaging recess is provided on the opposing surface.

[0013] The lock member has an insertion portion protruding from the lower surface of the mounting block so as to fit into the penetrating portion of the base holder. A housing portion for the engaging element is provided in each of the prism portions on both sides, and the engaging member having a diameter larger than the width of the prism portion is held in the housing portion so as to be laterally movable.

The lock bar has a cross-sectional shape adapted to the upper and lower penetrating portions of the lock member, and by being inserted into the penetrating portions, restricts the inward movement of the engaging member, and engages the pushed-out engaging member. The base holder and the lock member are fixed in a retaining shape by locking and holding the engagement state with the concave portion.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the automatic opening and closing device for a mold has an insertion portion 3 that can be freely inserted into and removed from a base holder 1 and an upper and lower penetrating portion 2 provided on the base holder 1. And a lock bar 7 which can hold the engaging element 4 so as to be able to move laterally at the position shown in FIG. The engaging recesses 8 of the engaging element 4 are provided on both side surfaces of the upper and lower penetrating portions 2 of the engaging member 4. The engagement state is maintained.

The base holder 1 is formed of a horizontally elongated block and formed in a U-shape in plan view, and the inside thereof is formed with upper and lower penetrating portions 2.
At both ends, mounting holes 9 penetrating back and forth are provided, and engaging recesses 8 are provided on the inner surface of the penetrating portion 2 on both sides facing surfaces.

Further, the lock member 5 has a mounting block 1 having mounting holes 10 penetrating front and rear at both ends.
An insertion portion 3 is provided on the lower surface of the base 1 so as to be inserted into and removed from the through portion 2 of the base holder 1 so as to be freely inserted into and removed from the upper portion. .

The insertion portion 3 has a length and a planar size suitable for the upper and lower penetrating portions 2 of the base holder 1. By forming the upper and lower penetrating portions 6, both sides sandwiching the upper and lower penetrating portions 6 are rectangular column portions 13. The front surface is closed by a plate 15 with bolts 14 so as to form a rectangular tube in cross section, and the engaging member 4 is held in a storage portion 16 provided in both prism portions 13 so as to be able to move laterally.

The engaging element 4 uses a roller having a diameter larger than the width of the prism 13, and the accommodating portion 16 is formed by a lateral hole having an inside diameter that can accommodate the roller with a margin. The engaging element 4 which is open on both side surfaces and which fits in the lateral hole is held with play so as to be able to move laterally in the storage portion 16, and a part of the outer periphery projects from both sides of the prism portion 13. I have.

The lock bar 7 is formed by a vertically long rectangular axis having a cross-sectional shape that is compatible with the vertical penetrating portion 6 of the lock member 5. The base holder 1 and the lock member 5 are fixed in a retaining shape by restraining the inward movement of the joint 4 and holding the engaged state of the extruded engaging element 4 in the engaging recess 8 in a locked state. Has become.

In the illustrated case, the engaging element 4 is a roller, but may be of another shape, such as a ball or an ellipsoid, and the engaging recess 8 of the base holder 1 may be formed as shown in the figure. A concave portion corresponding to the shape of the engaging element 4 may be employed without being limited to the arc-shaped lateral groove. Further, the lock bar 7 may adopt not only the square axis but also other cross-sectional shapes such as a round axis.

The switchgear of the present invention has the above-described configuration, and a method of using the switchgear will now be described. 2 and 3 show a state in which the opening / closing device is attached to the injection molding die. The locking member 5 is fixed to the movable mold plate 21 with bolts 17, and the base holder 1 is fixed to the fixed mold plate 22 with bolts 1.
At the same time, the upper end of the lock bar 7 is fixed to the stripper template 23 provided with the spool bush with bolts, and the lock member 5, the base holder 1, and the lock bar 7 are arranged so as to be vertically aligned. Since the internal structure of the injection mold and the mechanism for opening and closing are well known, they are not shown.

FIG. 2A and FIG. 3A show a state at the time of molding in which the respective mold plates of the injection mold overlap each other. In this state, the lock member 5 and the base holder 1 are vertically overlapped.
The insertion portion 12 of the lock member 5 is inserted into the vertical penetrating portion 2 of the base holder 1, and the lock bar 7 penetrates the vertical penetrating portion 6 of the lock member 5, and the lower end protrudes downward from the base holder 1. ing.

At this time, as shown in FIG. 3A, the lock bar 7 penetrating the insertion portion 3 of the lock member 5 is
Is pressed outward to prevent the inward movement of the engaging element 4 and keep the engaging element 4 engaged with the engaging recess 8 of the base holder 1. . As a result, the fixed mold plate 22 and the movable mold plate 21 each having the product molding portion are fixedly integrated.

At the time of demolding after the molding of the product, the fixed-side template 22 is moved in a direction away from the stripper template 23. Since the fixed-side mold plate 22 and the movable-side mold plate 21 are fixed and integrated by coupling the lock member 4 and the base holder 1, the fixed-side mold plate 22 and the movable-side mold plate 21 move integrally and are fixed. The movable mold plate 21 is separated from the stripper mold plate 23, whereby the resin runner portion is removed from the spool bush.

When the movable mold plate 21 and the fixed mold plate 22 are moved, the lock bar 7 is fixed to the stripper mold plate 23 having a fixed arrangement, so that the lock member 5 and the base holder 1 are locked. The movable template 21 moves along the bar 7, and the fixed integrated template 21 of the movable template 21 and the fixed template 22 is maintained.

The movement of the movable mold plate 21 proceeds, and FIG.
As described above, when the lock bar 7 is moved from the lower end to the position where the space between the engagement elements 4 comes out, the engagement elements 4 are released from the restraint by the lock bar 7 and can be moved inward. As shown in FIG. 2B, the plate 21 stops moving when the stripper bolt 24 comes into contact with the head, but the fixed mold plate 22 further moves.

When the fixed mold plate 22 moves with respect to the stopped movable mold plate 21, the base holder 1 comes out of the insertion portion 3 of the lock member 5, and at this time, The retained engaging element 4 is a lock bar 7
Since the restraint is released by coming out of the base member, the inward movement is free, and the engaging concave portion 8 of the base holder 1 comes off the engaging member 4 without resistance.

Therefore, as shown in FIG. 3C, the movable mold plate 21 and the fixed mold plate 22 are separated without any trouble, and the molded product can be taken out without any trouble.

When assembling the injection mold, the base holder 1 is moved by the movement of the fixed-side mold plate 22 to move the movable-side mold plate 21.
When the fixed-side mold plate 22 and the movable-side mold plate 21 overlap each other, the two mold plates 2
1 and 22 move integrally, the penetrating portion 6 of the lock member 5 fits over the lock bar 7, and the movable mold plate 21 and the fixed mold plate 22 are fixed by the engagement of the engaging element 4 and the engaging recess 8. In the integrated state, the movable mold plate 21 overlaps the stripper mold plate 23, and the assembly of the mold is completed.

[0031]

As described above, according to the present invention, in an automatic opening and closing device for an injection mold, a base holder,
A lock member that allows the insertion portion to be freely inserted into and removed from the vertical penetrating portion provided on the base holder, and that allows the engaging element to move laterally at positions on both sides of the insertion portion; and a vertical penetrating member provided on the lock member. A lock bar which can be freely inserted into and removed from the lock member. The engagement recesses of the engagement elements are provided on both side surfaces of the vertical penetrating portion of the base holder, and the lock bar is inserted into the vertical penetrating portion of the lock member. In this state, the engagement state of the engagement element with the engagement recess is maintained, so that the structure of the automatic opening and closing device is simplified, the use of a spring is eliminated, the operation reliability is excellent, and a failure due to impact or loss is achieved. This has the effect that there is no generation.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an automatic opening / closing device according to the present invention.

FIG. 2A is a cross-sectional view showing a fixed state of a mold of the automatic opening and closing device, and FIG. 2B is a cross-sectional view showing a separated state of the mold.

FIGS. 3A to 3C are explanatory diagrams showing a state in which the automatic opening / closing device is released from a mold fixed state.

FIG. 4 is a sectional view showing a conventional automatic opening / closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base holder 2, 6 Vertical penetration part 3 Insertion part 4 Engagement element 5 Lock member 7 Lock bar 8 Engagement recessed part 13 Square column part 16 Storage part

Claims (1)

[Claims] 1. A base holder, and a lock member holding an insertion portion which can be freely inserted into and removed from an up-and-down penetrating portion provided in the base holder, and an engaging element which can be moved laterally at positions on both sides of the insertion portion. A lock bar that can be freely inserted into and removed from the upper and lower penetrating portions provided in the lock member. Automatic opening and closing device for a mold, which retains the engagement state of the engagement element with the engagement recess when inserted into the upper and lower penetrating portions of the mold.