JPH0525861Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clamping device for fixing a mold or a workpiece to be machined.

[Prior art]

In general, injection molding equipment and die casting equipment
Various types of clamping devices are used to secure the mold to the surface of the fixed platen.

Usually, in the above-mentioned clamp device, the clamp device main body is fixedly held by fastening it with a bolt to a pre-formed bolt hole on the board surface, or if a T-groove is formed in the board surface, a T-shaped groove is inserted into the T-groove. The clamp device body is fixed to the panel surface by disposing a fixing member and screwing the tip of a bolt inserted into the clamp device body into the T-shaped fixing member.

In conventional clamp devices, basically, a clamp member such as a clamp arm is pivotally attached to the clamp device main body via a support shaft, or is mounted so as to be movable only within a movement stroke range for a predetermined clamp operation. It is provided in a predetermined positional relationship with respect to the clamp device main body, and is adapted to accommodate changes in the size of the mold by changing the mounting position on the panel surface of the clamp device main body.

[The problem that the idea aims to solve]

When fixing the clamping device to the panel surface with bolts, the clamping device had to be removed from the panel surface and reattached to a different position each time the mold was replaced with one of a different size, which was a very complicated process. . Moreover, if there is no bolt hole at a desired position on the board surface, it is necessary to newly form a bolt hole.

Therefore, in order to avoid changing the position of the clamp device, a measure is often taken to make the size of the mold constant.

When fixing the clamping device to the board surface via the T-groove, the T-groove is usually not formed vertically and horizontally, but only in one direction, so the clamping device can be freely moved in the direction of the T-groove. This reduces the need to reinstall the clamp device when replacing the mold.In many cases, the mold mounting board does not have a T-slot at all, so the method of fixing the clamp device using the T-slot is a general-purpose method. Lacks sex.

An object of the present invention is to provide a clamping device in which the position of the clamping point can be freely changed without changing the position of the clamping device main body and without changing the clamping force.

[Means to solve the problem]

A clamping device according to the present invention is a clamping device for fixing a target article such as a mold to a platen surface of a fixed platen, and the clamping device is provided upright on the platen surface at a predetermined interval in a facing and parallel manner and can be fixed and released. A pair of integral or separate guide blocks, a pair of guide grooves formed parallel to the board surface on opposing sides of the guide blocks, and a space between the guide blocks that is movable relative to the guide block. A clamp lever disposed on the clamp lever, and a clamp lever protruding from both sides facing the guide block midway in the length direction of the clamp lever,
a pivot shaft that engages with both guide grooves so as to be movable in the groove length direction and rotatably pivots the clamp lever to the guide block; and a tip of the clamp lever that protrudes toward the target article side relative to the guide block. A hydraulic cylinder is provided at the base end of the clamp lever and drives the base end in a direction away from the panel surface, and the clamp lever is provided with a hydraulic cylinder that drives the base end in a direction away from the panel surface, and controls the movement of the pivot shaft with respect to both guide grooves. The position of the clamp lever relative to the guide block is made variable through the clamp lever.

[Effect]

The clamping device of the present invention includes a pair of guide blocks, a pair of guide grooves formed therein, and a clamp lever that is movably engaged with both guide grooves and rotatably supported on both guide blocks. The pivot axis and
It has a simple structure consisting of a clamp lever, its action point, a hydraulic cylinder, etc., and in this clamp device, when the clamp is released, the pivot shaft can be moved toward both guide grooves toward the target article or to the opposite side. By moving the clamp lever to the guide block, the position of the clamp lever relative to the guide block can be adjusted as appropriate.

In this way, with the application point of the clamp lever positioned on the target article, when hydraulic pressure is supplied to the hydraulic cylinder and the base end of the clamp lever is driven in the direction away from the board surface, the application point moves onto the target article. It will be fixed to the board.

In this way, the position of the clamp lever can be freely changed depending on the size of the target article to fix the target article to the board surface.

[Effect of idea]

According to the clamping device according to the present invention, as explained above, objects of various sizes can be clamped without changing the fixing position of the guide block, so the labor for relocating the clamping device can be significantly reduced. In addition, it is easier to effectively utilize the existing bolt holes and T-slots on the fixed plate, so there is no need to form bolt holes or T-slots on the fixed plate, and even if it is necessary to form them, It is sufficient to form only the minimum number. Furthermore, the clamping force does not change even when the clamp lever is moved relative to the guide block, so even if the position of the application point is changed, the clamping force does not decrease and the designed clamping force can be exerted. There is no need to take measures such as resetting the oil pressure supplied to the

In addition, when the pair of guide blocks are formed separately, the guide blocks can be manufactured easily and inexpensively, which is also advantageous in terms of storage and storage of the clamp device.

〔Example〕

Embodiments of the clamp device according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the clamp device C is for fixing a mold 2 placed on the fixed platen 1 of a vertical injection molding machine to the fixed platen 1.
Basically, it consists of a pair of left and right guide blocks 10 that are fixed to the surface of the fixed platen 1, a clamp lever 20 that presses and fixes the mold 2 to the fixed platen 1, and a hydraulic cylinder 30 provided on the clamp lever 20. It is configured.

The pair of guide blocks 10 are erected on the plate surface of the fixed platen 1 in a parallel manner to face each other at a predetermined interval from side to side, and each guide block 10 has bolt holes penetrating from the top surface to the bottom surface in the front and rear parts. The guide block 10 is formed by screwing the lower end of the bolt 11 inserted into each bolt hole 10a into the bolt hole 1a formed in the fixed platen 1.
is fixed to the fixed plate 1. A rectangular guide groove 10b extending in the front-rear direction is provided parallel to the plate surface of the stationary plate 1 over the entire length in the middle portions of the opposing inner sides of both guide blocks 10.

The clamp lever 20 is connected to the guide block 10.
The length is approximately twice the length of the front and back.
This clamp lever 20 is attached to both guide blocks 10.
A shaft hole 20a is formed horizontally in the left-right direction in the middle of the clamp lever 20 in the front-rear direction, and a pivot shaft 21 is inserted through the shaft hole 20a. The two shaft ends protrude from both left and right sides of the clamp lever 20, and the upper and lower ends of both shaft ends are cut off to form a horizontal sliding surface. The clamp lever 20 is slidably fitted in the corresponding guide groove 10b in the front-rear direction, and the clamp lever 20 is rotatably supported around the pivot shaft 21 through sliding between the shaft hole 20a and the pivot shaft 21. It is supported by a shaft 21. At the rear end of the clamp lever 20, there is an action point 20 that comes into contact with the mold 2.
b is formed. In addition, the clamp lever 20
A predetermined gap is provided between the lower surface of the clamp lever 20 and the panel surface so that the pivot shaft 21 can rotate.

The hydraulic cylinder 30 presses the stationary platen 1 downward and drives the front end of the clamp lever 20 upward.The front end of the clamp lever 20 has a cylinder hole 30a vertically formed therein.
A piston portion 31a of a piston member 31 is attached to the piston 0a, and a rod portion 31b of the piston member 31 can be inserted through a lid member 32 that closes the lower end of the cylinder hole 30a and protruded downward.

The operation of the clamp device C configured as above will be explained.

When fixing the mold 2 to the fixed platen 1, the guide block 10 of the clamp device C is fixed with the bolt 11, and the clamp lever 20 is moved forward or backward relative to the mold 2 so that the action point 20b is fixed to the metal plate. Set so as to correspond to the upper part of the flange part of mold 2. After that, when hydraulic pressure is supplied from the hydraulic hose 34 to the oil chamber 33 of the clamp device C via the oil path 35, the oil chamber 3
3 expands and the piston member 31 is driven downward by the hydraulic pressure acting on the piston part 31a, and the rod part 31b advances downward and presses the fixed platen 1 downward, so that the front end of the clamp lever 20 is pressed against the fixed platen 1. The clamp lever 20 swings about the pivot shaft 21 to the clamp position shown by the two-dot chain line in FIG. Press and fix.

Next, when releasing the clamp of mold 2,
When the oil pressure is removed from the oil chamber 33, the piston member 31 is pushed upward by the spring force of the return spring 36 provided in the cylinder hole 30a, the rod portion 31b is retracted upward, and the front end of the clamp lever 20 is The clamp lever 20 is lowered, and the rear end of the clamp lever 20 swings upward and is returned to the clamp release position shown by the solid line in FIG.

As explained above, according to the clamp device C,
Since the clamp lever 20 is movable relative to the guide block 10, the guide block 10
It is possible to clamp molds of various sizes without changing the fixing position of the clamping device C, and the labor involved in relocating the clamping device C can be greatly reduced.
The distance between 1a and the point of application portion 20b and the hydraulic cylinder 30 forming the point of force remains unchanged, and the lever ratio does not change, so the clamping force is maintained constant. Furthermore,
Since the pair of guide blocks are separate structures, they can be manufactured at low cost and are advantageous in terms of storage and storage. However, it is preferable to form the pair of guide blocks 10 in one piece to simplify handling such as transportation. is also possible. In addition, the clamp lever 20 is used instead of the pivot shaft 21.
It is also possible to integrally form protruding pivot shaft parts on both sides of the clamp lever 20 that can be fitted into the guide grooves 10b. In addition, in order to fix the guide block 11 to the fixed plate 1, an engaging member that engages with the T groove of the cover fixed plate 1 is provided in the bolt hole 1a, and the bolt 12 is screwed into the engaging member. It is also possible to fix the guide block 11 by doing so.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the fixed platen and clamping device, FIG. 2 is a plan view of the clamping device, and FIG. 3 is a second view of the same device.
The line sectional view and FIG. 4 are rear views of the device. C... Clamp device, 10... Guide block, 10b... Guide groove, 20... Clamp lever, 20b... Action point portion, 21... Pivot shaft, 30
...Hydraulic cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] In a clamping device for fixing a target article such as a mold to the plate surface of a fixed platen, the clamping device is installed facing and parallel to the platen surface at a predetermined interval and is removable. A pair of integral or separate guide blocks, a pair of guide grooves formed parallel to the board surface on opposite sides of the guide blocks, and a space between the guide blocks that is movable relative to the guide block. A clamp lever disposed on the clamp lever, and a clamp lever protrudingly provided on both sides facing the guide block midway in the longitudinal direction of the clamp lever, and engaged in both guide grooves so as to be movable in the groove length direction to move the clamp lever to the guide block. a pivot shaft rotatably supported on the clamp lever; an action point portion formed at a distal end portion of the clamp lever that protrudes toward the object object side beyond the guide block; and an action point portion provided at a proximal end portion of the clamp lever. and a hydraulic cylinder that drives this base end in a direction away from the board surface, and is characterized in that the position of the clamp lever with respect to the guide block is made variable through movement of the pivot shaft with respect to both guide grooves. clamping device.