JPH0387222A - Extension of injection molding machine - Google Patents

Abstract

PURPOSE:To eliminate the necessity of moving the whole of an injection unit at the time of purging and increase workability by providing a pivoting mechanism for pivoting an L-shaped extension along the axis core of an injection nozzle of an injection section. CONSTITUTION:When a molded product is molded, an injection unit is moved to the right and a spring 51 disposed on the front of an injection section 10a is brought into contact with an extension 20 to rock the extension 20 in the counterclockwise direction to the position in which the same is brought into contact with a stopper pin 42a. At that time, the end of the nozzle of the extension and a mold spool bush are in the nozzle touch state to be ready for molding. Then, when purging is carried on, a ring 34 is rotated by a motor 33 in the state that an injection unit 10 is moved left and backward to face the extension 20 downward. In said position, the injection unit 10 is moved forward to the right of the paper surface again to bring the injection section 10a and the extension 20 into contact with each other for carrying out purging.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an extension for an injection molding machine, and more particularly to an improvement in an extension for an injection molding machine for an injection nozzle in contact with a mold.

(Prior art) Conventional injection press compound molding machines are used in combinations of a horizontal press device and a vertical injection device, and a vertical press device and a horizontal injection device, but in the former, the height of the device is generally high. There were problems with the installation condition, such as waving, and poor workability when replacing the screener. For this reason, the latter combination has become mainstream; for example, the sixth
As shown in the figure, a long L-shaped hot runner 74 is inserted between the mold spool bushing 72 of the mold 71 and the injection unit 73, and the mold spool bushing 72 and the tip nozzle 75 of the L-shaped hot runner 74 are connected to each other. is brought into contact with the heater ring 76 and the surrounding area is covered with a heater ring 76 (Japanese Patent Application Laid-Open No. 50-6
6558) etc.

(Problem to be solved by the invention! Ii) However, according to the conventional injection press compound molding machine described above, the one in FIG. 6 cannot purge on the spot, and the L-shaped hot runner 74 After the injection unit 73 is lowered and separated from the mold, it is necessary to retreat the injection unit 73 together with the L-shaped hot runner 74, which takes a lot of man-hours.

In particular, when purging is required during molding, it takes time and the resin inside the injection cylinder deteriorates.

Further, since the nozzle tip 75 of the L-shaped hot runner 74 faces upward, high temperature resin will blow upward during purging, making it dangerous to proceed.

Furthermore, since the injection unit 73 has many degrees of freedom in the front and back, up and down, and left and right directions, there are various problems such as difficulty in aligning the nozzle tip 75 and the mold spool bushing 72.

The present invention focuses on the above-mentioned conventional problems, and the injection unit does not move much during purging, etc., and maintenance and inspection can be performed safely.
The aim is to provide an extension for injection molding machines that requires less man-hours.

(Means for Solving the Problems) In order to achieve the above object, a first invention according to the present invention includes a mold device for molding molten resin and an injection section that supplies the molten resin between the molds. In a press molding device that supplies molten resin from an injection section to a mold device via an L-shaped extension, an L-shaped
It has a rotation mechanism that rotates the glyph extension. In the second aspect of the invention, the L-shaped extension swings in the vertical direction of the rotating axis.

(Function) According to the above configuration, since it rotates in the forward and reverse directions when purging, the tip of the nozzle of the L-shaped extension can be directed downward, so that high-temperature resin can be blown out downward. You can purge safely. In addition, it is only necessary to move the injection unit slightly backwards and then rotate it, which makes it possible to significantly reduce the amount of movement and reduce the number of man-hours compared to the conventional method. Therefore, deterioration of the resin can be prevented.

Furthermore, if the rotation mechanism is fixed by aligning the nozzle tip of the L-shaped extension with the mold spool busher, alignment with the injection unit can be easily adjusted only in the vertical and horizontal directions. can. In addition, repeated nozzle molding can be easily performed by simply moving the injection unit slightly backward.

(Example) The following describes the implementation of the injection press composite molding machine according to the present invention.
q will be explained to nIIN with reference to the drawings. 1st
The figure is an overall configuration diagram of an embodiment of the present invention. Figure 2 is the first
FIG. 3 is a side sectional view of the embodiment, and FIG. 3 is a front view of the first embodiment. FIG. 4 is a view rotated for purging. 1st
In the figure, a lower mold 3a of a mold device 3 is placed on a fixed guide plate 2 of a compression molding machine 1. An injection section 10a consisting of an injection cylinder, etc. of an injection unit 10 is disposed below the fixed Google grating 2 and the lower mold 3a.
An L-shaped extension 20 (hereinafter referred to as extension 20) is supported by a rotating mechanism 30 and is disposed between the lower surface of a and the lower surface of the ring. The extension 20 is made up of a bearing 32 that holds the ring, an electric motor 33 that rotates the ring, a plate 34 that fixes the bearing 32, and a cylinder 35 that adjusts the height. The swing mechanism 40 includes a pin 41 that pivots the extension 20 to the rotation mechanism 30, stopper bins 42a and 42b that stop the extension 20 from swinging, and a swing mechanism 40 that rotates the extension 20 clockwise. It consists of a spring 43 that swings to
A spring 51 is disposed in front of the injection B I Oa and comes into contact with the extension 20 when the injection section 10a moves forward to the right in the drawing.

As a result, the extension 20 rotates along the axis (A) of the injection nozzle of the injection section 10a, and moves in the direction of the vertical plane (B) of the rotating axis.

In the above configuration, the operation will be explained next.

When molding the next molded product, the injection unit 7 10 is advanced to the right in the drawing, the spring 51 disposed in front of the injection part 10a is brought into contact with the extension 2o, and the extension 2o is turned back. Rock clockwise. The extension 20 is swung to a position where it contacts the stopper bin 42a. At this time, the tip of the nozzle of the extendilon and the mold spool bushing come into contact with each other, and the molding becomes possible. In this state, when resin is injected, the bottom shape is formed, and nozzle repeat molding is performed, the injection unit 10 is simply moved back and forth slightly, as in the conventional horizontal forming machine.

Next, when purging is performed, the injection unit 10 is moved backward to the left in the paper (the state shown in Figure 1), that is, the nozzle tip of the extension and the mold spool bush are separated from each other. The motor 33 rotates the ring 34 to direct the extension 20 downward. At this position, move the injection unit 10 forward again to the right in the paper,
The injection part 10a and the extension 20 are brought into contact with each other to perform purging (the state shown in FIG. 4).

Since the extensilon 20 faces downward, purging can be performed safely.

FIG. 5 is a side cross-sectional view of the second embodiment, in which cylinders 61 and 62 are disposed so as to abut against the extension 20, in order to maintain the strength of the L-shaped portion of the extension 20, and to allow the extension 20 to be used independently. Used for control.

The cylinder 61 receives the load when the injection part 10a and the extension 20 come into contact, and the cylinder 62 lifts the extension 20 independently and brings the nozzle tip of the extension into nozzle contact with the mold spool bush. Used for positioning, etc. Similarly, cylinder 3
5 is also used. Although not shown, a cylinder, a ball screw, etc. are arranged on the plate 34, and the extension 20
You may move it back and forth, left and right on the page. Further, in the above mechanism, the swing mechanism is provided in the rotation mechanism, but it goes without saying that the rotation mechanism may be provided in the swing mechanism.

(Effects of the Invention) As explained above, according to the present invention, since the L-shaped extension is provided with a rotating mechanism and a swinging mechanism, there is no need to move the entire injection unit during purging, which reduces time and improves work efficiency. will improve. In addition, purging during molding saves time and prevents resin deterioration.
A good product can be obtained. Furthermore, since the nozzle tip can be directed downward, work can be done easily and safely without contaminating the nozzle tip with purged resin. Also,
Extension and mold, extension and injection part,
The excellent effect of being able to easily align the injection unit and rotation mechanism by slightly moving the injection unit and rotating mechanism is achieved.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of one embodiment of the present invention. FIG. 2 is a side sectional view of the first embodiment of the present invention. FIG. 3 is a front view of the first embodiment. Figure 4 is a diagram rotated for purging. FIG. 5 is a side sectional view of a second embodiment of the present invention. FIG. 6 is a side view of a conventional L-shaped extension. l・ 2・ 3・ 10・ 0a 20・ 30・ 40・ ・Compression molding machine ・Fixed Gui plate ・Lower mold ・Injection unit ・Injection part ・L-shaped extension ・Rotation mechanism ・Swing mechanism

Claims (2)

[Claims] (1) A press molding device that has a mold device that molds molten resin and an injection section that supplies the molten resin between the molds, and supplies the molten resin from the injection section to the mold device via an L-shaped extension. An extension for an injection molding machine, characterized in that it has a rotation mechanism for rotating the L-shaped extension along the axis of an injection nozzle of an injection section. (2) The extension for an injection molding machine according to claim 1, wherein the L-shaped extension swings in a vertical direction of the rotating axis.