JP2544746Y2 - Injection / detachment clamp device for injection molding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mold removing / clamping apparatus for an injection molding machine.

[0002]

2. Description of the Related Art In general, a molding die used for injection molding is mounted by fixing the die mounting plate to a die base plate using a bolt or a clamp device. In order to obtain flexibility in the mounting position, a clamp device having a T-shaped groove formed in the base plate and having a T-shaped leg sliding in the T-shaped groove may be used. The present invention relates to a mold clamping device having a T-shaped leg for leading a T-shaped groove of the mold base.

FIGS. 7 and 8 show an example of a conventional clamping device for attaching and detaching a mold. Reference numeral 70 in the figure denotes a mold base plate, and 71 denotes a mold mounting plate. The clamping device 80 includes an apparatus main body 81 and a clamp lever 82 pivotally attached to the apparatus main body 81 via a support shaft 86.
On the lower surface, a T-shaped leg 83 that slides in a T groove 72 provided in the mold base 70 is provided.

[0004] The clamping device 80 has a
1 is moved to a desired position by sliding a T-shaped leg portion 83 on the lower surface in a T-groove 72 provided in the mold base 70, a clamp lever 82 is operated, and the clamp portion 84 is moved to a mold. The mold base plate 70 is attached to a mounting plate 71 formed integrally with the mold base plate 70.
Is to be fixed. The clamp lever 82 introduces a working fluid such as hydraulic oil into a cylinder 85 provided in the main body member 81 and raises a piston 87 by the pressure,
Thus, the rear portion of the clamp lever 82 is lifted, and the clamp portion 84 is pressed against the mold mounting plate 71. The reference numeral 88 in the drawing of FIG.
7 is a return spring.

However, in the clamp device having such a structure, in order to attach and detach the mold, the T-shaped leg portion and the T-groove of the mold base have a small amount such as an allowance and a margin for the clamp device. However, depending on the magnitude of the dimensional difference, the clamp may be loosened or wobble. Therefore, it is required to increase the stroke of the clamp cylinder or to manufacture the T-shaped leg and the T-groove with high dimensional accuracy. In addition, such precision machining is not only complicated and difficult, but if this dimensional difference is made too small, a new problem arises in that it takes time to attach and detach the clamp device and the mold.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such a problem, and absorbs a dimensional tolerance formed between a T-shaped groove and a T-shaped leg to ensure reliable tightening. It is an object of the present invention to provide a mold attaching / detaching clamp device for an injection molding machine having an urging force.

[0007]

Means for Solving the Problems That is, the present invention provides:
A clamp lever is pivotally connected to a main body member having a T-shaped leg portion on the back surface that slides in a T-shaped groove of a mold base via a support shaft, and a rear portion of the lever is lifted to clamp the tip of the lever. A urethane rubber spring with a biasing force for lifting a rear portion of the clamp lever, wherein the urethane rubber spring is configured to press the mold mounting plate.
A cylinder device for pushing down the urethane rubber spring, a ball plunger in contact with the lower surface of the clamp portion of the lever on the main body member, and a T-groove upper surface of the mold base plate on the rear surface side of the main body member. The present invention relates to a mold attaching / detaching clamp device for an injection molding machine, wherein a ball plunger to be in contact with the mold is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front view showing a part of a mold attaching / detaching clamp device of an injection molding machine of the present invention in a cross section, and FIG.
3 is a cross-sectional view taken along line 3 of FIG. 1, and FIG.
FIG. 5 is a partially cutaway front view showing a state in which the invented device has released a clamp, and FIG. 6 is a partially cutaway front view showing a state in which a mold is clamped. It is.

As shown in FIGS. 1 to 6, a mold detaching clamp device 10 of the injection molding machine of the present invention comprises a main body member 11 and a clamp lever 12, and as shown in FIG. 11 is slidably attached to a T-groove 31 of a mold base 30 via a T-shaped leg 13 formed on the back surface of the mold 11.

[0010] Clamp lever mounting portions 14, 14 are formed on the upper portion of the main body member 11, and a clamp lever 12 is rotatably pivoted via a support shaft 15.

The clamp lever 12 is connected to the main body member 11.
Adjustment screw 12a which is screwed with the rear part of the lever 12 by raising the piston 23 of the cylinder device 20 provided at
Is lifted, the lever tip 12b is lowered, and the clamp portion 16 presses the mold mounting plate 32.

The adjusting screw 12a of the clamp lever 12 changes the screwing depth with the lever 12 in accordance with the thickness of the mold mounting plate 32 to be fixed and the required tightening force. The position of the clamp portion 16 is adjusted by adjusting the height position of the rear portion of the lever 12.

The cylinder device 20 comprises a cylinder body 21 and a piston 23, and has a urethane rubber spring 22 inside the cylinder body 21. Symbols 27 and 29
Is a seal member.

The urethane rubber spring 22 constantly applies a biasing force in the forward direction to the piston 23 of the cylinder device 20 to lift the rear portion of the clamp lever 12 and generate a large mold clamping force at the clamp portion 16. .

On the other hand, the cylinder device 20 pushes down the piston 23 with the pressure oil introduced into the chamber 26 of the main body 21 in response to the urging force of the urethane rubber spring 22 lifting the lever 12, thereby causing the urethane rubber spring 22 to move. It is configured to compress.

That is, when the mold mounting plate 32 is not clamped, the hydraulic oil supplied from a hydraulic source (not shown) into the chamber 26 of the cylinder body 21 against the urging force of the urethane rubber spring 22 in the forward direction. Is introduced, the urethane rubber spring 22 is compressed, and the clamp portion 16 is opened.

When the mold mounting plate 32 is clamped, the compression of the urethane rubber spring 22 is released by discharging the pressure oil from the chamber 26 to the tank, and the repulsive force of the urethane rubber spring 22 causes the rear portion of the clamp lever 12 to be closed. The adjusting screw 12a is pushed up to generate a high tightening force.

The urethane rubber spring 22 used in the present invention is a synthetic rubber spring having excellent durability and easy processing, and for example, a trade name of "urethane rubber spring dice (Kurashiki Kako Co., Ltd.)" is preferable.

An example of the physical properties of the urethane rubber spring is shown below. The test method is based on JIS K6301. Specific gravity (JIS) 1.1 Hardness (JIS) 90 100% tensile stress (kg / cm ² ) 70 Tensile strength (kg / cm ² ) 460 Elongation (%) 470 Tear strength (kg / cm) 80 Compression set (%) 33 Rebound resilience (%) 55 Embrittlement temperature (° C) -70 Abrasion loss (mg / 1000 times) 100

Since the urethane rubber spring 22 has a higher spring constant than a metal spring or a rubber cushion and has an excellent spring-out force, it is possible to reduce the size of the urethane rubber spring 22 as compared with a conventional cylinder device. it can.

The main body member 11 is provided with a ball plunger 25A and ball plungers 25B, 25B. The ball plunger 25A is provided on the clamp lever 12 side of the main body member 11, and the tip of the ball plunger comes into contact with the lower surface of the clamp portion 16 so as to always urge the clamp portion 16 in the opening direction. Therefore, when the device 10 is not clamped, that is, when the urethane rubber spring 22 of the cylinder device 20 is compressed, the lever 12 is held in the open state, so that the mold and the clamp device 10 can be moved and detached quickly and easily. be able to.

On the other hand, the ball plungers 25B, 25B are provided on the back surface of the main body member 11 which is in sliding contact with the T-grooves 31 of the die base 30, and are formed between the T-shaped leg 13 and the T-grooves 31. The set dimensional tolerance is applied to the ball plunger 2
It is completely absorbed by the biasing force of 5B and 25B. By determining the gap between the clamp portion 16 and the mold mounting plate 32 as an optimal size by adjusting the adjusting screw 12a in advance, the wobble and loosening of the clamp device do not occur, and the clamp device has a high clearance. By effectively utilizing the urging force of the urethane spring having a spring constant, a high tightening force is generated.

[0023]

As shown and described above, according to the mold attaching / detaching clamp device of the injection molding machine of the present invention, a urethane rubber spring is provided in the cylinder device, and the piston for lifting the rear portion of the lever is always in the forward direction. The main body member is provided with a ball plunger that contacts the lower surface of the lever on the clamp portion and a ball plunger that contacts the upper surface of the T-shaped groove of the mold base plate on the back side of the main body member. Therefore, not only can a large compression force be generated by a compact cylinder device, but also the dimensional error between the T-groove of the mold base and the T-shaped leg of the clamp device can be completely absorbed, and the It can be quickly and easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of a mold attaching / detaching clamp device of an injection molding machine of the present invention in a cross section.

FIG. 2 is a sectional view taken along the line 2-2.

FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1;

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1;

FIG. 5 is a partially cutaway front view showing a state in which the invented device releases a clamp.

FIG. 6 is a partially cutaway front view showing a state where a mold is clamped.

FIG. 7 is a perspective view showing an example of a conventional mold clamping device.

FIG. 8 is a sectional view taken along line 8-8.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Die attaching / detaching clamp apparatus 11 Main body member 12 Clamp lever 13 T-shaped leg part 15 Support shaft 20 Cylinder device 22 Urethane rubber spring 25A Ball plunger 25B Ball plunger

Claims (2)

(57) [Scope of request for utility model registration] 1. A clamp lever is pivotally connected to a main body member having a T-shaped leg on a back surface thereof sliding in a T groove of a mold base via a support shaft, and a rear portion of the lever is lifted up. A clamp portion at a tip end portion of the lever presses the mold mounting plate; and a urethane rubber spring with an urging force for lifting a rear portion of the clamp lever, and a urethane rubber spring for pushing down the urethane rubber spring. The main body member is provided with a ball plunger that abuts on the lower surface of the lever on the clamp portion side and a ball plunger that abuts on the upper surface of the T-shaped groove of the die base plate on the back surface side of the main body member. A mold attaching / detaching clamp device for an injection molding machine. 2. The apparatus according to claim 1, further comprising an adjusting screw for adjusting a height position of a rear portion of the clamp lever.