JPS6136340Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold locking device for mounting a mold on a platen surface in, for example, an injection molding machine.

Recently, for example, in horizontal injection molding machines, there has been a trend to install mold locking devices on the left and right sides of the platen surface in order to shorten the setup time for mounting and removing the mold. In this case, the mold must be mounted on the platen surface and its entire weight must be supported by a mold locking device. In addition, since the size of the mold used is not constant, the mold installation space between the left and right mold locking devices is matched to the largest mold used, making it easy to install and remove the mold. Therefore, it is necessary that the mold locking device does not protrude into the mold mounting space when unlocking.

Further, the mold locking device must maintain the mold locking state even if its drive source is no longer activated after locking. Furthermore, even if there is no mechanical positioning system on the movable platen side, it is necessary to prevent the mold from becoming misaligned using a mold locking device.

Several types of mold locking devices have already been proposed with the aim of satisfying the above conditions.
The wedge type requires the cylinder to be installed diagonally or taper processing is required on the mold base, and the structure of other types is complicated as it requires a combination of forward and pressing, turning and pressing; However, problems such as the need to machine a groove on the platen surface for advancement were inevitable.

The present invention was devised to solve the above-mentioned conventional problems. A clamp body is fixed to the platen surface on which the mold is mounted, and a wedge with a sloped surface on the platen surface side is attached to the clamp body. A clamp claw that is inserted into the wedge so that it can move forward and backward in parallel with the wedge and has a pressure receiving surface that engages with the wedge on the back side is pivotally supported so that it can fall forward, and a retractable clamp claw is provided between the clamp claw and the wedge. By providing a mechanism, no machining is required on the mold or platen side.
Another object of the present invention is to provide a mold locking device having a simple structure that can reliably and firmly lock a mold using a wedge method without having to go into the mold mounting space during unlocking.

Hereinafter, the present invention will be explained with reference to illustrative embodiments.

In the figure, 1 is the surface of a fixed or movable platen (hereinafter referred to as the platen surface) on which a mold of a horizontal injection molding machine is mounted, and a clamp body 2 is fixed to the side of the platen surface 1 with bolts 3 or the like. ing.

A wedge 4 is fitted into the clamp body 2 by a hydraulic cylinder 5 so as to be movable in parallel to the platen surface, and a sloped surface 6 is formed on the side of the wedge 4 opposite to the hydraulic cylinder 5 on the platen surface side.

Reference numeral 7 denotes a clamp claw, which is pivotally supported by a pin 8 on the platen surface side of the front end portion of the clamp body 2 (the side opposite to the cylinder 5) so as to be rotatable forward by the wedge 4, and a wedge is provided on the back side of the clamp claw 7. A pressure receiving surface 9 that comes into contact with 4 is formed.

Numerals 10 and 11 are clamp claw retracting mechanisms; 10 is a pin protruding from both sides of the pivoting end of the clamp claw 7 on the back side; 11 is a pin protruding from both sides of the front end of the wedge 4 on the platen surface side; A pull-back piece provided so as to extend, and the pull-back piece 11 is extended during the backward stroke of the wedge 4.
is adapted to engage with the pin 10.

12 is a proximity switch, which connects the clamp body 2
The wedge 4 is attached to the base end of the sensor so that the wedge 4 serves as the object to be detected.

In the above configuration, when the wedge 4 is advanced by the pushing operation of the hydraulic cylinder 5, the wedge 4
hits the clamp claw 7, pushes it forward, rotates it around the pin 8 toward the mold side, and pushes it further toward the platen surface in a state almost parallel to the platen surface 1, so the base d of the mold D is attached to this clamp. The claw 7 presses and clamps the platen surface 1. That is,
The mold D is reliably and firmly locked by, for example, a total of four clamp claws 7 arranged on both left and right sides of the platen surface 1. The completion of this locking is sensed by installing a pressure switch in the hydraulic piping connected to the hydraulic cylinder 5, and is interlocked with the operation of the injection molding machine.

Next, when unlocking, when the wedge 4 is retracted by retracting the hydraulic cylinder 5, the wedge 4
When the pull-back piece 11 attached to the clamp engages with the pin 10 attached to the clamp claw 7 and is moved further backward, the clamp claw 7 is rotated about the pin 8, so that the wedge 4 and the clamp claw 7 are moved against the clamp body. It will stop when it is stored in 2. The completion of this unlocking is detected by the proximity switch 12.

In the present embodiment, a clamp pawl retracting mechanism consisting of a pin 10 and a retracting piece 11 is used, but a mechanism in which a spring is stretched between the clamp pawl 7 and the wedge 4 may also be used, for example.

As described above, the present invention has a clamp body fixed to the platen surface facing the mold side, a wedge that can move forward and backward toward the mold side, and a clamp claw that can be rotated by the wedge, and when unlocking, the clamp claw is connected to the wedge. Because it is configured to be stored inside the clamp body by a pull-back mechanism provided in between,
The mold can be easily installed and removed without having to go into the mold installation space.

Further, since the structure is of a wedge type in which the clamp claw is rotated by a wedge during locking, the mold can be reliably and firmly locked, and even if the wedge movement source fails, the locked state will not loosen or come undone.

Furthermore, unlike the conventional locking device in which the locking of the mold is performed by a compound operation, the structure is simple because it uses a single-action operation system. Further, it has the advantage that no special processing is required on the platen surface side.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a plan view of FIG. 2. 1...Platen surface, 2...Clamp body, 3
... Bolt, 4 ... Wedge, 5 ... Hydraulic cylinder, 6 ... Slope surface, 7 ... Clamp claw, 8 ... Pin, 9 ... Pressure receiving surface, 10 ... Pin, 11 ... Retraction piece, 12...Proximity switch.

Claims (1)

[Scope of utility model registration request] A clamp body is fixed to the platen surface on which the mold is mounted, and a wedge having a sloped surface on the platen surface side is inserted into the clamp body so as to be movable forward and backward parallel to the platen surface, and is engaged with the wedge on the back side. A mold locking device characterized in that a clamp pawl provided with a pressure receiving surface is rotatably supported forward, and a clamp pawl retracting mechanism is provided between the clamp pawl and the wedge.