JPS5932304B2 - Chuck used for cooling plastic molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chuck used when cooling a plastic molded product, and more particularly to a chuck that provides a good cooling effect to the molded product during the cooling of the molded product or the stacking process of the molded product.

During the injection molding process of plastic moldings with sidewalls, such as bottle storage containers or fruit shipping containers, the sidewalls of the molding may be damaged if appropriate distortion prevention measures are not taken while the molding is hot. It is well known that inwardly directed distortion occurs.

Such distortion during cooling of a molded product, which is usually referred to as In order to prevent distortion, until now, a cooling jig having a surface shape that is almost the same as the inner surface shape of the molded product taken out from the mold was manually fitted into the molded product, and a cooling jig was manually fitted into the molded product for a predetermined cooling time. It was necessary to add a step of extracting the cooling jig after the period of time had elapsed. The addition of such a process not only reduces productivity, but also causes undesirable non-uniformity in the quality of the final product due to the fact that the cooling jig is not necessarily inserted or removed uniformly. bring. Therefore, in order to provide a uniform cooling effect to the injection molded product, instead of manually operating the cooling jig,
It is desirable to use a cooling jig that can be operated automatically. Furthermore, the above cooling process is a necessary process for all molded products with straight sidewall parts, and may be carried out separately from subsequent processes, but the productivity of the injection molding process is related to the above cooling process. In order to further improve the product, the cooling process and stacking process should be connected so that a predetermined number of cooled molded products can be stacked and transferred to the subsequent process for convenient product inspection, packaging, or transportation. It is desirable to do so. However, in order to make such a linkage of processes possible, significant changes in processes and equipment are required, and on the other hand, there are no practical means to make such improvements possible. Until now, almost no proposals worth considering have been made. The present invention solves the inconveniences associated with such conventional processes and devices, and can be used alone in the cooling process of molded products, or in combination with a stacking device in the stacking process of molded products in conjunction with the cooling process. Their primary purpose is to provide chucks that, when used in conjunction, can provide a uniform cooling effect to the molded product. Another main object of the present invention is to provide a chuck for use in cooling plastic molded products, which has a simple structure, is less likely to malfunction, and has excellent operational safety. SUMMARY OF THE INVENTION These objects of the present invention are a chuck used for cooling a plastic molded product, which includes a piston that presses the molded product, and which causes the piston to protrude when the molded product is hot. It presses the side wall of the molded product from the inside to the outside and holds the pressed state for a certain period of time, and also has a means for returning the piston to its original position, and after the molded product has cooled, returns the piston to its original position and molds. This can be advantageously achieved industrially by using a chuck used during cooling of the plastic molded product, which is adapted to release the product from the chuck.

Hereinafter, the present invention will be described in detail based on the illustrations of the accompanying drawings.

In the drawings, FIG. 1 is a plan view of the main parts of the chuck according to the present invention, FIG. 2 is a front view of the entire device showing the chuck attached to the molded product stacking device, and FIG. 3 is an example of the chuck shown in FIG. FIG. 3 is a top view of the device. In FIG. 1, a chuck 20 according to the present invention has a piston 22 that presses a plastic molded product 17, and when the molded product is in a hot state after injection molding, the piston 22 is projected to press the molded product 17. The side wall is pressed from the inside to the outside and kept in this pressed state for a certain period of time. It also has a piston return pressure chamber formed at the tip inside the cylinder 21, and after the molded product has cooled, the inside of the cylindrical soda cylinder 21 is By switching the flow of pressurized fluid from the piston ejection pressure chamber formed in the base to the piston return pressure chamber, the piston 22 can be returned to its original position and the molded product 17 can be released from the chuck 20. ing.

As is clear from the above description, the chuck according to the present invention includes:
It can be used alone in the cooling process of the molded product after injection molding. However, in order to improve productivity and uniformity of final product quality, it is more desirable to coordinate the operation of the chuck with the stacking movement of the molded parts. Therefore, a more detailed explanation will be given based on an embodiment in which the chuck of the present invention is incorporated into a stacking device for molded products. As shown in FIG. 3, a drive motor 2 is provided so as to be able to rotate laterally between a standby position and a stacking position as shown by the arrow in FIG.

In the illustrated embodiment, the molded products are stacked on a conveyor 3 that moves intermittently, and are successively stacked up to a predetermined number or height. A support 4 is installed on the surface plate 1, and an arm mount 6 having wheels 5 is attached to it so as to be vertically movable, using two outer sides of the support 4 as rails. An arm 7 extending laterally is rotatably attached to the arm mount 6, a molded product mounting table 8 is fixed to its tip, and an arm rotation device 19 is provided at its base. A pair of chucks 20 for gripping the plastic molded product 17 are provided on the table 8.

The chuck 20 is a piston 22 that presses the molded product 17.
and a hydraulic or pneumatic cylinder 21 for protruding the piston 22 in conjunction with the stacking movement of the stacking device when the molded product is hot, and the projection of the piston 22 causes the side wall portion of the molded product 17 to is pressed from the inside to the outside and held in the pressed state for a predetermined period of time required for cooling. In order to ensure that the piston 22 presses the side wall portion of the molded product 17, a press plate 23 is provided at the tip of the piston 22, and the press plate 23 is provided opposite to the outer surface of the side wall of the molded product 17. A pressure receiving plate 9 is provided at a corresponding position. The chuck 20 also includes the molded product 1.
After cooling of the molded article 17, means are provided for returning said piston 22 to its original position in conjunction with the stacking movement of the stacking device and releasing the molded article 17 from the chuck 20. In the embodiment illustrated in the drawings, the means for returning the piston 22 and releasing the molded part 17 from the chuck 20 are
A piston return pressure chamber formed at the tip of a pressurized cylinder 21 that uses pressurized fluid such as hydraulic pressure or air pressure, and the opposite side of the piston return pressure chamber, that is, the pressurized cylinder 21
The piston includes a switching valve device for switching the flow of pressurized fluid from the piston ejection pressure chamber formed at the base end of the piston to the piston return pressure chamber.

Another pressure cylinder 10 is installed in the center of the surface plate 1 facing upward.

A pulley 12 is provided at the tip of the piston 11 of the pressurizing cylinder 10, and another pulley 13 is attached to the top of the column 4 side to which the arm mount 6 is attached. A rope or chain 14 passes through these pulleys 12, 13 and is tied to the arm mount 6 and a fulcrum 15 at the top of the device. If the total length of the pressurizing cylinder 10 is about 1/2 of the height of the device, the arm mount 6 can be moved up and down over almost the entire length of the column 4 by the vertical movement of the piston 11. The device according to the invention operates as follows by means of control means (not shown) known per se.

In the initial standby position, the surface plate 1 is located close to the molded product take-out device 16 shown in FIG.
The molded product 17 is placed on standby at approximately the middle position of the support 4 with the molded product 17 facing upward. The molded product 17 is placed on the table 8 by the take-out device 16 with the opening facing downward, as shown in FIG. When the placement of the molded product 17 is completed, the piston 22 protrudes from the pressure cylinder 21 of the chuck 20 by hydraulic or air pressure supplied from an external pressure source (not shown), and the side wall portion of the molded product 17 is moved from the inside to the outside. Press towards.

Therefore, the side wall portion of the molded product 17 has a pressure plate 23 and a pressure receiving plate 9.
The molded product 17 is pressed outward while being held between them, and cooling of the molded product 17 proceeds in this state. When a predetermined cooling time has elapsed and the temperature has fallen to a temperature at which no distortion occurs in the side wall of the molded product 17, a control means (not shown) is activated to activate the pressure cylinder, and the piston 11 descends to pull the rope or chain 14. The table 8 on which the molded product 17 is placed is pulled up to the top of the device and stopped. At that position, the arm rotation device 19 starts rotating, inverts the table 8 so that it faces downward, and then the device drive motor 2 operates to move the surface plate 1 to the third position.
The table 8 is rotated laterally in the direction indicated by the arrow in the figure to bring the table 8 to the stacking position on the conveyor 3 (see FIG. 3). The piston 11 of the pressurized cylinder 10 then rises, and the molded product 17 descends with its bottom facing down, stopping its descent when its bottom touches the molded product 17 on the conveyor 3 or already stacked, and at this point The clamping of the molded product 17 by the chuck 20 is released. That is, the flow of pressurized fluid is switched from the piston ejection pressure chamber of the pressurizing cylinder 21 to the piston return pressure chamber by the operation of the switching valve device, whereby the piston 22 returns to its original position and the press plate 23 The molded product 17 held between the pressure receiving plate 9 and the pressure receiving plate 9 is released. After this, the arm 7 rises to the top of the support column 4, and the cooling and stacking process of the molded product 17 is completed. Thereafter, the device once descends along the support column 4 to the lower limit, and then rises again to return to the original height of the standby position.

In the illustrated embodiment, a single table and chuck are used to hold the molding machine during cooling, but as an alternative, multiple sets of tables may be used to further extend the cooling time provided to the molded product. and a chuck may be provided, and these members may be sequentially driven once in a step feed manner in conjunction with the cooling and stacking motion of the molded products, so that a cooling effect can be applied to two or more molded products simultaneously.

Further, the number of pressurizing cylinders and the stroke of the piston (see FIGS. 1A and B) can be appropriately selected depending on the shape of the molded product. The means for controlling the device of the present invention as described above includes a molded product supply signal from the molded product take-out device, a plurality of limit switches attached to predetermined positions of the device, a solenoid, a timer, a pressurized fluid source, and a pressurized fluid source. The control circuit includes a switching valve device and the like for switching the flow of fluid, and its configuration is well known.

As is clear from the above description, according to the apparatus of the present invention, cooling of molded products can be carried out fully automatically or semi-automatically, either alone or in conjunction with the stacking movement of molded products.

Therefore, according to the present invention, it is possible to provide a molded product with cooling while the side wall portion is pressed, which is suitable for preventing the occurrence of distortion, and in combination with strictly controlling the cooling time, the quality of the final product is improved. Stability can also be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a chuck according to the present invention, FIG. 2 is a front view of the entire device showing the chuck attached to the molded product stacking device, and FIG. 3 is the device illustrated in FIG. 2. FIG. 20: Chuck, 9: Pressure receiving plate, 21: Pressure cylinder, 1
7: Molded product, 22: Piston, 8: Table, 23: Press plate, 19: Arm rotation device.

Claims (1)

[Scope of Claims] 1. A chuck used when cooling a plastic molded product, which has a piston that presses the molded product, and when the molded product is hot, the piston protrudes and cools the side wall of the molded product. The piston is pressed from the inside to the outside and held in the pressed state for a certain period of time, and has means for returning the piston to its original position. After the molded product has cooled, the piston is returned to its original position and the molded product is removed from the chuck. A chuck used for cooling the plastic molded product, characterized in that the chuck is configured to open. 2 A chuck that is used in conjunction with a stacking device for plastic molded products to cool the plastic molded product, and has a piston that presses the molded product, and when the molded product is in a hot state, the chuck is used when cooling the plastic molded product, and when the molded product is in a hot state, the chuck Protruding the piston in conjunction with the stacking motion to press the side wall of the molded product from the inside to the outside and maintaining the pressed state for a certain period of time,
It also has means for returning the piston to its original position, and after the molded product has cooled, the piston is returned to its original position in conjunction with the stacking movement of the stacking device to release the molded product from the chuck. A chuck used for cooling plastic molded products in conjunction with the plastic molded product stacking device.