JPS636334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding machine of a multistage stacking type injection molding machine, that is, an injection molding machine of a type in which molds are arranged back to back on the left and right sides.

Such injection molding machines are already known, but the technical concept of the conventional one is to inject material from one injection tube into a multi-stage stacked mold in one shot. There was a problem that only molded products of 100% could be obtained, and molded products of different materials and/or different colors, and molded products of similar materials and different colors could not be molded.

This problem could be solved by installing two injection tubes for the left and right molds and injecting the left and right molds separately. However, if this is done, two injection molding machines will essentially be put together, and the usefulness of the multistage overlapping mold will be lost.

Therefore, the present invention provides a multi-stage mold that can achieve injection molding of molded products made of different materials and/or different colors, similar materials, and different colors in a structurally and operationally simple manner, and that retains the usefulness of a multi-stage overlapping mold. The aim is to provide a stacked injection molding machine.

The mold multi-stage stacking type injection molding machine of the present invention has a hot runner manifold, and a hot runner manifold block in which nozzle touch portions are provided at both ends of the main runner in the hot runner manifold is placed inside the hot runner manifold block. A switching valve is provided, in which a die whose cavity is communicated with a secondary runner in the hot runner manifold of the block is disposed, and the main runner of the block has a port that opens either the left or right die and shuts off the other. The main runner is equipped with an injection nozzle facing each of the nozzle touch portions at both ends of the main runner.

According to the present invention, the switching valve of the main runner in the hot runner manifold of the hot runner manifold block opens the mold on any side of the left and right molds, and shuts off the other molds. The molding material can be injected into the mold on the side of the mold from the injection nozzle that belongs to it. That is, the hot runner manifold block can be used in common for the left and right molds, and injection molding of the molding material can be performed by switching between the left and right molds, and the switching can be done without replacing the runner system. You get it.
Thus, according to the present invention, injection molding of molded products made of different materials and/or different colors, and similar materials and different colors can be achieved structurally and operationally simply, while retaining the usefulness of a multi-stage overlapping mold. guaranteed.

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

In the figure, reference numeral 1 indicates a multistage overlapping mold unit, and reference numeral 2 indicates each set of molds in the unit, and each set of molds has a male mold 2a and a female mold 2b. These molds 2, 2 are placed on the left and right sides of a movable hot runner manifold block 3 that can move in a predetermined direction, and one set of male molds 2a is placed on a fixed surface plate 4, and a female mold is placed on the fixed surface plate 4. The mold 2b is attached to the surface of the block 3 on the fixed surface plate 4 side, and the male mold 2a of the other set is attached to the movable surface plate 5.
Next, attach the female mold 2b to the other side of the block 3. The hot runner manifold block 3 has nozzle touch parts 7 at both ends of the main runner 6a in the hot runner manifold 6, and also has a secondary runner 6b in the hot runner manifold in the cavities of the left and right molds 2, 2. It has small nozzles 8, 8 that communicate with each other. A hydraulic plunger for driving the movable surface plate 5 is designated by the reference numeral 9.

The block 3 is connected to the movable surface plate 5 by a tension link (not shown), and the molds 2, 2 are opened/closed and clamped by the operation of a hydraulic plunger 9.

The molding cavity in the set of left and right molds 2, 2 may be one molding cavity in each set as shown in Fig. 1 (cross-sectional plan view), or one molding cavity in each set as shown in Fig. 2 (cross-sectional plan view). You can also take multiple pieces.

Main runner 6a in hot runner manifold of hot runner manifold block 3
At the branching part of the secondary runners 6b and 6b,
A switching valve 10 is installed which has a port 11 that opens one of the left and right molds 2 and shuts off the other. The switching valve 10 may be a slide type as shown in FIG. 3 (cross-sectional front view) or a rotary type as shown in FIG. 4 (cross-sectional plan view). In the example shown in FIG. 3, the switching valve 10 is moved up and down by turning the operating handle 12 through a screw 13. Fourth
In the illustrated example, it may be rotated by any suitable means known per se. Main runner 6 above
a) Place the injection nozzle 14 in a fixed position so that it faces each of the nozzle touch parts 7 and 7 at both ends.

Reference numeral 15 indicates a fluid pressure ejector for releasing the molded product, and 16 indicates a fluid flow path thereof.

When the switching valve 10 is positioned so that the port 11 is in direct contact with the left secondary runner 6b, the left mold 2
is opened, the mold 2 on the right side is shut off, and injection molding can be performed using the mold 2 and injection nozzle 14 on the left side.If the switching valve 10 is switched to the opposite side, injection molding on the opposite side can be performed. It is possible.

In addition, in the present invention, the switching valve is not only equipped with a port that opens either the left or right mold and shuts off the other.
Port for opening both left and right molds (not shown)
You can apply it if you want something with . According to such a switching valve, the multistage overlapping mold unit 1 can be used for the same purpose as the conventional mold unit.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing one embodiment of the present invention;
FIG. 2 is a cross-sectional plan view showing another example of implementing the present invention;
FIG. 3 is a longitudinal sectional front view showing one example of the switching valve, and FIG. 4 is a transverse plan view showing another example of the switching valve. 1 is a multistage overlapping mold unit, 2 is a mold,
3 is a hot runner manifold block, 4 is a fixed surface plate, 5 is a movable surface plate, 6 is a hot runner manifold, 6a is a main runner, 6b is a secondary runner, 7 is a nozzle touch part, 8 is a small nozzle, 9 is a hydraulic plunger , 10 is a switching valve, 11 is a port, 12 is an operating handle, 13 is a screw, and 14 is an injection nozzle.

Claims (1)

[Claims] 1. A hot runner manifold block having a hot runner manifold, with nozzle touch parts provided at both ends of the main runner in the hot runner manifold, and secondary runners in the hot runner manifold of the block on both left and right sides. A mold that communicates with the cavity is placed in the main runner of the block, and a switching valve is installed in the main runner of the block that has a port that opens one of the left and right molds and shuts off the other. A multi-stage stacking type injection molding machine featuring an injection nozzle that faces out.