JPS6127712Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a movable platen support device for an injection molding machine.

Injection molding machines mold various products using a half mold attached to a movable plate that is slidably guided by tie bars and a mating half mold attached to a fixed plate. Then, molds of different shapes and weights are attached. Therefore, when the mold half is attached to the movable platen, the center of gravity of the mold moves each time the molded product changes.

In conventional injection molding machines, the movable platen is slidably guided by tie bars inserted through tie bar holes drilled in the upper part of the movable platen, and supporting rollers are fixed to the lower surface of the movable platen. It constitutes a support device. Therefore, the tie bar is loosely fitted into the through hole of the movable platen, and there is an appropriate gap between the tie bar and the tie bar through hole.

Each time a different mold half is attached to the movable platen, its center of gravity shifts, so the contact point of the support roller fixed to the lower surface of the movable platen to the base due to the gap between the tie bar through hole and the tie bar. When the mold is closed, the guide pin provided to guide it to the mating mold may tend to be strained, resulting in undesirable movement between the mold halves.

In order to eliminate the above-mentioned drawbacks of the conventional movable platen support device, the present invention provides a movable platen having a tie bar through hole guided by the tie bar of an injection molding machine.
Supporting rollers that can slide in the moving direction of the movable platen and fix its position are provided on the bottom surface of the movable platen, and the center of gravity can be adjusted according to the movement of the center of gravity caused by attaching various half molds to the movable platen. The purpose of this is to prevent the movable platen from tilting by moving and fixing the supporting roller directly below the movable platen.

A conventional movable platen support device will be explained in detail with reference to FIGS. 1 to 4.

1 is a movable platen, and a tie bar 2 is inserted into the tie bar passage hole 1a, and the movable platen 1 inserts the tie bar each time the mold clamping device of the injection molding machine closes the mold (see Fig. 3) and opens the mold (see Fig. 4). 2 as a guide to slide back and forth.
As described above, an appropriate gap is required between the tie bar passage hole 1a and the tie bar 2 for this purpose.
In order to support the weight of the movable platen 1 and the half mold 14,
A supporting roller 12 is pivotally supported 13 on a bracket 11 fixed to the bottom of the movable platen 1. The mating mold half 15 is fixed to a fixed platen 16.

The size and weight of the half-mold 14 that is changed each time the molded product differs, and the half-mold 1 is replaced each time.
The center of gravity of the movable platen 1 with the movable platen 1 mounted thereon moves from side to side in FIG. Therefore, the movable platen 1 is tilted due to the gap between the tie bar through hole 1a and the tie bar 2.

Next, an embodiment of the movable platen supporting device according to the present invention will be described with reference to FIGS. 5 and 6. Rigid slide members 3, 3 are fixed to the bottom surface of the movable platen 1, and two fixing brackets 4, 4 having holes through which threaded rods 8, 8 are inserted are provided at the ends opposite to the mold. Further, slide brackets 5, 5 are loosely passed through the lower surfaces of the slide members 3, 3 by means of V-guides. One end of slide brackets 5, 5 is fixed to the tips of threaded rods 8, 8 inserted through fixed brackets 4, 4, respectively, and both slide brackets 5, 5 have
Supporting rollers 7, 7 are supported by shafts 6, 6. 9,
Reference numeral 10 denotes an adjustment nut for moving the threaded rod 8 in and out of the fixed bracket 4 to adjust and fix the position of the slide bracket 5 relative to the movable platen 1.

To adjust the position of the slide bracket 5, when moving the supporting roller 7 to the left in FIG. 5, move the adjustment nut 9 toward the slide bracket 5 by the amount of movement, and then fix the adjustment nut 9 Rotate the adjusting nut 10 until it contacts the bracket 4. Furthermore, when moving the supporting roller 7 to the right in FIG. Rotate the adjustment nut 9 until they touch.

The above position adjustment of the slide bracket 5 is preferably performed on both sides of the movable platen 1 at the same time.

The slide bracket 5 may be moved by fixing a cylinder to the fixed bracket 4, fixing the slide bracket 5 to the tip of the cylinder's piston rod, and supplying and discharging pressure oil from the outside to the cylinder.

As can be understood from the above explanation, in the movable platen support device for an injection molding machine according to the present invention, the movable platen can be supported directly below the center of gravity, which changes each time a mold half is replaced with the movable platen. This prevents the occurrence of inclination caused by the gap between the tie bar through hole of the movable plate and the tie bar, and allows the mold half attached to the movable plate to always open and close normally with respect to the mating half mold attached to the fixed plate. be able to.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a state in which a conventional movable plate support device is attached to a movable platen, Fig. 2 is a front view of the same, and Figs. 3 and 4 are mold clamping devices of an injection molding machine. FIG. 5 is a partially sectional side view of an embodiment in which a movable platen supporting device according to the present invention is attached to a movable platen, and FIG. 6 is a front view of the same. be. 1... Movable plate, 2... Tie bar, 3... Slide member, 4... Fixed bracket, 5... Slide bracket, 7... Support roller, 8... Threaded rod,
9, 10...Adjusting nut, 11...Bracket,
14...half mold, 15...mating half mold, 16...
Fixed board.

Claims (1)

[Scope of utility model registration request] A slide member is fixed to the bottom of a movable platen of an injection molding machine, a threaded rod is movably provided by penetrating a fixed bracket provided at the end of the slide member on the side opposite to the mold, and is attached to the lower part of the movable platen on the mold side. , a slide bracket is provided that pivotally supports the support roller and freely passes through the lower surface of the slide member, and the end of the threaded rod and the slide bracket are fixed, and the support roller is attached to a movable member with a half mold attached. A movable plate support device characterized by being movable to the center of gravity of the plate.