JPS59200Y2 - Mold automatic clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic mold clamping device for mounting and removing molds of injection molding machines, die casting machines, etc.

Generally, installation and removal work of molds such as injection molding machines or die-casting machines is often performed in narrow spaces, and in such cases, not only is work efficiency poor and inefficient, but also heavy objects such as molds are There are also many safety issues when handling.

In addition, the mold mounting plate is usually machined with complex-shaped grooves such as dovetail grooves for mold mounting, which increases the processing cost, which not only affects production costs but also reduces the rigidity of the mold mounting plate. There are also disadvantages such as.

In the past, various mold automatic clamping devices have been devised and invented in order to eliminate the above-mentioned drawbacks, but it is troublesome to install these mold clamping devices, and many of the mold clamping devices are difficult to install. The space between the lights gets pinched, causing inconvenience during molding operations and mold replacement work.To prevent this, the longitudinal dimension of the entire machine has been extended to prevent the space between the lights from narrowing. This greatly affects the price of the machine.

This invention was developed in view of the current situation, and allows for the installation of heavy molds easily, quickly, and safely in confined spaces.
An object of the present invention is to provide an automatic mold clamping device that can be removed.

Next, one embodiment of the present invention will be explained with reference to Figs.
The hydraulic cylinder 1, which is attached to a casing 3 which is firmly fixed with a similar size), is fitted with a piston 4 that can be moved forward and backward by pressure oil acting on the inner chambers A and B. A slope 5a that acts as a wedge as the piston 4 moves forward and backward, and a rack 6 that engages with a pinion, which will be described later, are provided.

Reference numeral 7 denotes a column which is rotatably attached to the casing 3 about its axis C as a rotation axis, and shares the rotation axis C;
The rack 6 is fixed to the column 7 and only when the column 7 rotates.
A pinion 8 is provided which meshes with the pinion 8.

Reference numeral 9 denotes a presser claw for clamping the mold 10, the intermediate part of which is supported by the pin 11 of the support 7 so that it can swing from side to side like a balance, and is supported against the rotation of the support 7. is adapted to rotate in synchronization with the support column 7 from the mold clamping release position to the mold clamping position.

Therefore, when one end of the presser pawl 9 is pushed up by a push-up pin 12 which will be described later, the other end on the mold presser side descends to press the mold 10 against the die plate 2 and clamp it.

The push-up pin 12 is mounted so as to be slidable in a direction perpendicular to the sliding direction of the piston rod 5, and its bottom surface is a slope having the same inclination angle as the slope 5a of the piston rod 5. , when the piston rod 5 moves forward (to the left in the figure), the slope 5a pushes up the push-up pin 12, and as a result, one end of the presser claw 9 is pushed up and the other end is lowered to clamp the mold 10. This spring resists the push-up blade of the push-up pin 12 due to the wedge action of the slope 5a of the piston rod 5, and always acts to lower the push-up pin 12 downward.

The structure is as explained above, and its operation will be explained next. First, when the mold is tightened, when pressure oil acts on the inner chamber A of the hydraulic cylinder 1, the piston 4 moves forward (left side in the figure). Since the rack 6 provided on the piston rod 5 and the pinion 8 attached to the column 7 are engaged with each other, the column 7 begins to rotate, and the presser claw 9t attached to the column 7 is rotated. The mold is rotated from the mold tightening release position shown by the chain line 9a in FIG. 2 to the mold clamping position shown by the solid line, and the rack 6 and pinion 8 are disengaged as shown by the chain line 8a in FIG. ing.

Then, as the piston 4 continues to move forward, the inclined surface 5a of the piston rod 5 enters the bottom surface of the push-up pin 12, and when the wedge action pushes up the push-up pin 12, one end of the presser pawl 9 is pushed up, The mold clamping side at the other end descends and clamps the mold 10 to the die plate 2.

Further, when the mold 10 is unclamped, pressure oil acts on the inner chamber B of the hydraulic cylinder, and the reverse operation of the mold clamping operation described above is performed.

That is, the mold clamping force of the presser pawl 9 is released by lowering the push-up pin 12 due to the retraction of the screw I/N 4 (to the right in the figure), and then the presser pawl 9 rotates to the extent that it comes off the mold 10. There is something to be done.

The operation is as explained above, and depending on the size and shape of the mold, the required number of devices can be easily attached to the die plate by drilling tapped holes, which is not conventionally done. There is no need to process large notches when installing the mold clamping device, and the drawbacks listed at the beginning can also be eliminated.

In addition to eliminating the above-mentioned drawbacks, it is also possible to prevent the clamp from coming off even if the action of the hydraulic oil stops for some reason in the clamped state.

That is, if a vertical force F is applied to the push-up pin 12 as shown in FIG. The pressing force P is P=F (100-2μ).

Therefore, theoretically, if the friction coefficient μ≧0.1, then P≦0, and the wedge will not come off.

[Brief explanation of drawings]

FIG. 1 is a diagram of a clamping device showing one embodiment of the present invention. FIG. 2 is a diagram showing a part of FIG. 1 in the direction of the Z arrow. 3 is a cross-sectional view taken along line II in FIG. 1, and FIG. 4 is a diagram illustrating the force relationship of the clamp of the device of the present invention. 1... Hydraulic cylinder, 5... Piston rod, 6...
... Rack, 7... Support, 8... Pinion, 9...
- Presser claw, 10... Mold, 12... Push-up pin.

Claims (1)

[Scope of utility model registration request] In an automatic mold clamping device used for attaching and removing molds of injection molding machines or die-casting machines, etc., there is a rod-shaped support that is rotatably attached to the axis, and a rod-shaped support that shares the axis with the above-mentioned support and is attached to the same support. The support is arranged so that the other end is pushed down by a pinion that engages with a rack, which will be described later, and a push-up blade that acts on one end, and the middle part of the support swings left and right like a balance so as to press the mold against the mold mounting surface. The presser pawl is supported by the column and rotates in synchronization with the rotation of the support from the mold clamp release position to the mold clamp position, and is moved forward and backward by pressure oil acting on a hydraulic cylinder. a piston rod having an inclined surface at the tip thereof, and a rod-shaped body whose bottom portion has the same inclination as the inclined surface of the piston rod, which can move forward and backward in a direction perpendicular to the axis of the piston rod,
Due to the movement of the piston rod back and forth, the inclined surface of the piston rod moves in and out of the inclined surface of the bottom of the rod-like body, and due to the wedge action, the tip at the opposite end of the rod-like body pushes up and down one end of the presser claw. An automatic mold clamping device comprising a push-up pin and a rack that is attached to the tip of the piston rod, meshes with a pinion provided on the support, and rotates the support as the piston rod advances and retreats.