JP3360477B2 - Clamping device for molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device such as a die, and more particularly, to a clamping device such as a die such as a die casting machine or an injection molding machine or a die such as a processed product in a molding machine. The present invention relates to a clamp device such as a mold configured to press a mold or the like with a rotating claw.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional example of such a structure. In FIG. 7, reference numeral 1 denotes a die mounting plate, specifically, a fixed plate or a movable plate. There are a total of four columns 2 on the peripheral edge of the die mounting plate 1, and a plurality of die clamping devices 3, for example, two at two positions opposed to the column 2, for example, two at opposite positions. Installed. 1a
Is a mold.

FIG. 7 shows details of the mold clamping device 3. Reference numeral 13 shown in FIG. 7 is a pressing claw, which is rotatably supported on a base 17 via a shaft 14. The rear side of the holding claw 13 is accommodated in a casing 15, and a compression spring 16 is elastically mounted between the casing 15 and the top plate, and rotates in a clockwise direction in FIG. Gives habit.

A ram piston 18 is fitted on a base 17 located below the rear portion 13b of the holding claw 13 so as to be able to move up and down. A hemispherical projection 19 protrudes from the upper end of the ram piston 18, and is slidably fitted in a spherical seat 13a provided on the lower surface of the rear portion 13b of the pressing claw 13. The lower part of the ram piston 18 is in contact with the step 17a of the base 17, and its lower limit is regulated. However, the step 17a does not necessarily have to be provided.

On the rear end side of the ram piston 18, a projection 20 having an inclined surface 20a on its lower surface is projected. The projection 20 is disposed in one hydraulic chamber 21 formed in the base 17. The lower surface of the hydraulic chamber 21 rises and forms a horizontal plane, and a piston 22 is slidably fitted in the other cylindrical hydraulic chamber 21a.
By contacting the stepped portion 21b provided on the lower surface in the middle of "a", the advance limit thereof is regulated.

A wedge 23 is integrally provided at the tip of the piston rod 22a on the hydraulic chamber 21 side of the piston 22. The lower surface of the piston rod 22a and the wedge 23 in the hydraulic chamber 21 is
c is slidably provided with respect to the lower surface inclined surface 2 of the projection 20 according to its movement.
0a, and can be separated. Therefore, the projection 20 and the wedge 23 form a wedge mechanism. A guide rod 24 is provided on the rear end side of the piston 22.
Is protruding.

[0007]

However, in a conventional clamping device such as a metal mold or the like configured as described above, if the clamping device is used for a long period of time, rust may be generated on the shaft for rotating the pressing claw, Rust on the side surface of the pawl often makes it impossible to move the presser pawl only with the elastic force of the spring, making it difficult to smoothly and repeatedly clamp and release the mold, etc. It is sufficient to use a large spring in order to increase the elastic force of the spring because of its complicated structure, but there is a drawback that the spring force cannot be increased due to space problems.

Further, even if a ram-shaped cylinder is provided in place of the spring in order to eliminate the drawbacks when the spring is used, the problem that the structure is still complicated has not been solved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a clamping device such as a mold having a simple structure and capable of smoothly clamping and releasing the mold. is there.

[0010]

In order to achieve the above object, a first aspect of the present invention has a front end capable of clamping a mold, and is rotatably mounted on a base via a shaft. A presser claw provided, a presser portion of a mold is provided at a front portion of the presser claw, and a ram piston is provided at a rear portion of the presser claw via a spherical contact portion in a state of intersecting with the presser claw. The lower part is made horizontal at the tip of the piston rod of the piston that moves forward and backward in the cylinder disposed at a distance from the rear part of the presser claw, and the upper part has an enlarged diameter that gradually increases in the forward direction. A sliding member is fixedly attached, and the upper part of the sliding member is engaged with a concave groove formed in the rear end of the pressing claw, and the lower part of the sliding member is engaged with a concave groove fixed to a base so as not to fall off. I combined. Further, in the second invention mainly based on the first invention, the hydraulic pressure introduction passage communicating with the piston head side in the cylinder in the base, and the hydraulic pressure introduction passage communicating with the piston rod side in the cylinder and the rear end of the ram. And the road were provided separately.

[0011]

When the mold is to be clamped by using the clamp device of the present invention, when the pressurized oil is introduced into the hydraulic chamber and the piston rod chamber through the hydraulic path from the tightening side port, the ram piston rises and the presser claw is raised. While the piston is moved to the right and the sliding member and the concave groove are engaged, the holding claw is rotated counterclockwise around the shaft to clamp the die at the tip of the holding claw. Conversely, when pressure oil is introduced from the loosening port to the piston head side, the piston moves to the left, the sliding member and the concave groove are loosened, and the presser pawl is rotated clockwise about the shaft to release the clamp.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a clamping device for a mold according to the present invention.

FIGS. 1 to 5 show one embodiment of a clamping device for a mold or the like according to the present invention. FIG. 1 is a longitudinal sectional view of a clamping device showing a state where the mold is clamped by a pressing claw. FIG. 3A is a longitudinal sectional view of a clamp device showing a state in which the clamp of the mold by the presser pawl is released, and FIG. FIG. 3B is a partially enlarged view showing an engagement state between the rear side of the presser pawl and the sliding member when the mold clamp is released, and FIG. 4 is a view AA of FIG.
FIG. 5 is a side view of the sliding member, and FIG. 5 is a diagram showing the relationship between the forward and backward movement of the sliding member and the loosening allowance at the rear end of the presser claw.

Incidentally, 13, 13a, 14, 17, 18,
Components denoted by reference numerals 19, 21, 21a, 22, 22a, and 24 are the same as those described as the conventional example, and thus description thereof will be omitted, and only different portions will be described.

The mold clamping device 3 of the present embodiment comprises a base 1
7, a cylinder 35 is disposed at one upper end, and a sliding member 30 is fixed to a tip end of a piston rod 22a of a piston 22 that moves forward and backward in the cylinder 35.

On the other hand, the concave groove 3 engaged with the sliding member 30
Reference numerals 1 and 32 are disposed on the rear end side of the holding claw 13 and on the base 17, respectively.

That is, on the rear end side of the holding claw 13, a concave groove 31 having a gradient rising from the rear end side to the front end side of the holding claw 13 is provided.

On the other hand, the concave groove 3 is formed on the base 17 in the horizontal direction.
2 are provided. The lower surface of the sliding member 30 is horizontal, and the upper surface is directed from the rear end to the front end of the holding claw 13 so that the sliding member 30 is engaged with the concave grooves 31 and 32. The structure has a diameter-expanded shape that gradually increases.

Further, as shown in FIG. 4, the side cross section has an I-shape, so that even if the sliding member 30 moves back and forth between the forward limit and the backward limit, it cannot fall out of the concave grooves 31 and 32. Is configured.

A ram piston 18 is fitted to a base 17 located below the rear portion 13b of the holding claw 13 so as to be able to move up and down. At the circumference of the ram piston 18, the ram bottom side 1
An appropriate number of oil rings 18b are mounted so that the pressure oil does not leak from between the ram piston 18 and the cylinder 33 engraved on the base 17 when the hydraulic oil is introduced into 8a.

There is provided a hydraulic passage 39 through which pressure oil can be simultaneously introduced into the piston rod chamber 35a of the cylinder 35 and the hydraulic chamber 21 from the closing port 38.

A hydraulic passage 40 is provided so that hydraulic pressure can be introduced from the loosening port 37 into the piston head chamber 35b of the cylinder 35.

The operation of the clamp device according to the present embodiment configured as described above will be described.

As shown in FIG. 1, when the mold 1a is clamped, when the pressurized oil is simultaneously introduced into the cylinder chamber 33a and the piston rod chamber 35a from the tightening side port 38 through the hydraulic path 39, the piston 22 is moved. Forward limit position (Fig. 3
(B)), the ram piston 18 is raised and the holding claws 13 are pushed up by the projections 19 while moving rightward from the retreat limit position (FIG. 3A).

Then, the holding claw 13 is attached to the ram piston 1
8 is rotated upward in the counterclockwise direction in FIG. 1, and the pressing portion of the mold 1 a is strongly pressed by the tip 13 c of the pressing claw 13.

When it is desired to release the clamped state, as shown in FIG. 2, pressure oil is introduced into the piston head chamber 35b from the loosening port 37 via the hydraulic path 40, and the pressure in the hydraulic chamber 21 and the piston rod chamber 35a is reduced. As the oil is discharged from the closing port 38, the ram piston 18 descends. Then, the piston 22 is caused to move leftward from the retreat limit position (FIG. 3A) to the forward limit position (FIG. 3B), and the rear end of the presser claw 13 is pushed downward, and the presser claw 13 is pushed. The tip 13 of the presser claw 13 is rotated clockwise in FIG.
c is separated from the wedge 23 of the mold 1a, and the clamp of the mold 1a is released.

When the sliding member 30 moves forward from the retreat limit position shown in FIG. 3A to the forward limit position shown in FIG. 3B, the rear portion 13b of the presser claw 13 is shown in FIG. Thus, the pressing claw 13 is rotated clockwise by the interference S, and the clamp of the mold 1a is released. In the present embodiment, the sliding member 30 has an I-shape, but is not limited to this and may have another shape.

[0028]

As is apparent from the above description, the present invention has the following effects.
The clamp of the mold or the release state of the clamp only needs to supply and discharge the pressure oil from the loosening side port and the tightening side port, so the structure is simple and the sliding member only moves forward and backward easily and reliably for a short time. Can be done with

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a clamp device showing a state in which a mold is clamped by a pressing claw.

FIG. 2 is a longitudinal sectional view of the clamp device showing a state in which the clamping of the mold by the presser claws is released.

3 (a) is a partially enlarged view showing an engagement state between a pressing claw rear side and a sliding member at the time of mold clamping, and FIG. 3 (b) is a pressing claw rear side and a sliding member at the time of mold clamping release. FIG. 5 is a partially enlarged view showing an engagement state with the first embodiment.

FIG. 4 is a side view as viewed from A to A in FIG. 1;

FIG. 5 is a diagram illustrating a relationship between forward and backward movement of a sliding member and a loosening allowance of a rear end portion of a pressing claw.

FIG. 6 is a front view illustrating a conventional structure.

FIG. 7 is a longitudinal sectional view of a conventional clamping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die mounting board 1a Die 3 Die clamp device 13 Holding claw 13a Spherical seat 13b Rear part 14 Shaft 15 Casing 17 Base 18 Ram piston 19, 20 Projection 21 Hydraulic chamber 22 Piston 22a Piston rod 23 Wedge 30 Sliding member 31, 32 Recessed groove 33, 35 Cylinder 35a Piston rod chamber 35b Piston head chamber 37 Loose side port 38 Tightening port 39, 40 Hydraulic path

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F16B 2/10 F16B 2/10 Z

Claims (2)

(57) [Claims] 1. A pressing claw having a tip end capable of clamping a mold, rotatably supported on a base via a shaft, and a pressing portion of the mold at a front portion of the pressing claw. At the same time, a ram piston is provided at the rear portion of the presser claw via a spherical contact portion in a state of intersecting with the presser claw, and moves forward and backward in a cylinder disposed behind the presser claw and separated from the rear portion of the presser claw. A sliding member having a lower part in a horizontal shape and an upper part having an enlarged diameter gradually increasing in the forward direction is fixed to the distal end of the piston rod of the piston, and the upper part of the sliding member is engraved on the rear end of the holding claw. A mold clamping device, characterized in that a concave groove provided is engaged with a concave groove fixed to a base below the sliding member so as not to fall off. 2. A hydraulic pressure introduction path communicating with a piston head side in a cylinder and a hydraulic pressure introduction path communicating with a piston rod side and a rear end of a ram in the cylinder are separately provided in a base. The mold clamping apparatus according to claim 1, wherein