JPH0230126Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a mold clamping device, and more specifically, a mold placed on a surface plate is pressed from above by a clamp piece to be placed on the surface plate. It is. Note that the surface plate referred to here refers to one with a broad meaning,
For example, we have expanded the locations where molds can be attached, such as movable and fixed plates for mounting molds in die-casting machines, platens in injection molding machines, bolsters in presses, surface plates and bolsters in jigs, beds in machine tools, etc. It includes.

Conventional technology Conventionally, many mold clamping devices of this type use hydraulic pressure to operate clamp pieces to place the mold on a surface plate, but the structure of the clamping device is complex, and because hydraulic pressure is used, The cost is high, and when the mold is placed on the surface plate, the clamp piece must be configured so that it does not interfere with the mold and interfere with the placement, and a large amount of space must be taken up for the clamp device. There were some problems, such as:

Purpose of the invention This invention aims to solve the above-mentioned problems, and aims to simplify the structure and reduce costs by manually operating the clamp piece without using a pressure source such as hydraulic pressure, and moreover, it is equivalent to hydraulic pressure. The mold is securely placed in place with a moderate clamping force, and when not in use, the clamp piece is placed in a position that does not interfere with the mold placement part, and only when in use, the clamp piece can be pushed out to the top of the mold with a single touch and pressed. The object of the present invention is to provide a mold clamping device that does not take up much space and is easy to operate.

Structure and function of the device A clamp in which a clamp piece connecting lever bearing part is erected on the front part of the mold side, a pair of cam bearing parts are erected on the rear part, and a bolt hole for fixing the surface plate is drilled in the center part. A case, a cam rotatably supported via a support shaft between the cam bearing portion of the clamp case, and having a clamp push rod protruding from its front end surface; a clamp piece having a front side portion rotatably pivoted to the upper end of the connection lever, a rear lower surface slidably abutting the cam, and a recessed portion into which the push rod is inserted/removed; By rotating the operation knob attached to the outward protrusion of the spindle of the cam and rotating the cam, the push rod is fitted into the recess of the clamp piece, and the push rod moves the clamp piece back and forth, and the cam tilts it. Accordingly, there is provided a mold clamping device characterized in that the mold is pressed and fixed to the surface plate by a presser protruding from the lower surface of the front end of the clamp piece.

Embodiments Hereinafter, this invention will be explained in detail with reference to embodiments shown in the drawings.

In the figure, 1 is a surface plate, 2 is a mold clamp device fixed to the upper surface of the surface plate 1, and 3 is a mold placed on the surface plate 1 and fixed by the clamp device 2.

The clamp device 2 includes a clamp case 4 fixed to the surface plate 1, and a lever 5 attached to the clamp case 4.
The main components are a clamp piece 6 supported so as to be movable forward and backward and tiltable via a cam 7, and a cam 7 which is rotatably supported on the clamp case 4 and allows the clamp piece 6 to move forward and backward and tilt. The clamp case 4 has a horizontal base 4a fixed on the surface plate 1, with cutouts on both left and right sides of the front part on the side where the mold is placed, and an arcuate upper surface of the horizontal base 4a, which bulges out in an arc shape to form a bearing part 4b for a clamp piece connecting lever. A shaft hole 4c is bored through the bearing portion 4b. A cam bearing part 4d is provided protrudingly on both left and right sides of the rear side of the clamp case 4, and a shaft hole 4e is provided in the cam bearing part 4d, and a concave shape for cam rotation is provided in the horizontal base part 4a between the cam bearing parts 4d. A stepped portion 4f is provided, and a bolt hole 4g for fixing to the surface plate 1 is bored in the center of the horizontal base 4a.

The lower end portions of a pair of coupling levers 5, 5 are rotatably attached to the left and right sides of the front bearing portion 4b of the clamp case 4 via a support shaft 8, and the upper end portions of the levers 5, 5 are attached to a clamp piece 6. Left and right notches 6a on the front side of the
A support shaft 9 is rotatably attached to 6a through a shaft hole 6b, and the clamp piece 6 is supported on the clamp case 4 via levers 5, 5 so as to be movable back and forth and tiltable. A mold pressing protrusion 6e is formed on the lower surface of the front end of the clamp piece 6.

A cam 7 is rotatably mounted between the rear cam bearing portions 4d of the clamp case 4 via a support shaft 10. The support shaft 10 is fixed to the cam 7 and is rotatably fitted into the shaft hole 4e of the bearing portion 4d, and
One side extends outward and an operation knob 11 is attached thereto. The cam 7 has a generally fan-shaped cross section, and has a push rod 12 protruding from its front end surface. The rear lower surface of the clamp piece 6 slidably abuts and supports the outer peripheral surface of the cam 7, and a recess 6c into which the push rod 12 is inserted and removed is provided, and a surface plate is provided in the center of the clamp piece 6. Wrench hole 6 for tightening the fixing bolt 14 to
d is drilled.

A cover case 15 is placed over the clamp device 2, and is provided with a presser spring 13 at the rear end of its upper surface for pressing the clamp piece 6 from above.

The clamp device 2 connects the clamp piece 6 via the lever 5 with the bolt 14 pushed into the clamp case 4, and after the assembly, the bolt 14 is inserted into the bolt hole 1a drilled in the surface plate 1. , insert a wrench into the wrench hole 6d of the clamp piece 6, and tighten the bolt 1.
4 into the bolt hole 1a and tighten and fix. After that, the cover case 15 is put on.

Before the mold 3 is placed on the surface plate 1, the clamp piece 6 of the clamp device 2 is retracted to the position shown by the dashed line in FIG. It is retracted to a position where it is stored in the cover case 15 and does not interfere. At this time, clamp piece 6
The push rod 12 of the cam 7 is inserted into the recess 6c.

After placing the mold 3 on the surface plate 1, the support shaft 1 of the cam 7
0 by the knob 11 and rotate it counterclockwise in FIG. Due to this rotational operation, the push rod 1 inserted into the recess 6c
2 moves toward the mold 3, the clamp piece 6 moves forward while rotating the lever 5 about the support shaft 8, and the front side of the clamp piece 6 is placed on the holding part 3a of the mold 3. Advance. When the clamp piece 6 reaches the position shown by the solid line in FIG.
2 is removed, and when the cam 7 is further rotated, the large diameter part of the cam 7 comes into contact with the lower surface of the clamp piece 6, and the presser spring 1
3, the rear end of the clamp piece 6 is pushed up, the front end is lowered using the support shaft 9 as a fulcrum, and the protrusion 6e on the lower surface clamps the mold 3 to the surface plate 1.

To release the clamp on the mold 3, rotate the knob 11 clockwise in the opposite direction to the above, and the rotation of the cam 7 will cause the large diameter portion to come out of contact with the clamp piece 6, causing the cam 7 to release the clamp piece. 6 is released, the protrusion 6e at the front end of the clamp piece 6 rises, and the mold 3 is unclamped. Next, the push rod 12 of the cam 7 fits into the recess 6c, and as the push rod 12 moves backward, the clamp piece 6 retreats to the position shown by the dashed line in FIG.
stored inside.

Effects As is clear from the above explanation, according to the mold clamping device according to this invention, the clamp piece stored in the cover case can be advanced upwards of the mold simply by manually rotating the spindle of the cam. Then, the clamp piece can be tilted and the mold can be pressed and fixed with the lower surface of the front end of the clamp piece.The structure is simple, and cost reduction can be achieved because a pressure source such as hydraulic pressure is not used as in the conventional method. . In addition, since the clamp piece is housed in the cover case, it does not get in the way when the mold is placed on the surface plate, and it has various advantages such as requiring less space for the clamp device. .

[Brief explanation of the drawing]

FIG. 1 is a front view of a clamp device according to this invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a side view of FIG. 1. 1...Surface plate, 2...Mold clamping device, 3...
Mold, 4...Clamp case, 5...Lever, 6
... Clamp piece, 6c ... Recess, 7 ... Cam, 1
2...Push stick.

Claims (1)

[Scope of utility model registration request] The front side of the clamp piece is supported via a lever on the front side of the mold mounting side of the clamp case fixed to the surface plate via bolts so that it can move forward and backward and tilt freely, and a cam is rotated on the rear side of the clamp case. The lower surface of the rear side of the clamp piece is slidably supported on the outer peripheral surface of the cam, and a push rod is provided protruding from the front end surface of the cam, and the push rod is inserted into and removed from the lower surface of the clamp piece. A recess is provided, and by rotating the support shaft of the cam, the clamp piece is moved back and forth through a push rod inserted into the recess, and the clamp piece is tilted by the outer peripheral surface of the cam to press the mold. mold clamping device.