JPS59224326A - Injection molding machine - Google Patents

Abstract

PURPOSE:To make easier the re-start-up of an injection molding machine by melting raw materials in a short time by a method in which raw material is melted by heating in a raw material heating cylinder using infrared rays and the molten raw material is sent by a feed plunger to an injection cylinder and then injected into molds. CONSTITUTION:Raw material is supplied into a raw material heating cylinder from a hopper 27 and melted in the heating cylinder in which a reflecting plate 13 is covered on the periphery of an infrared lamp in which a filament 9 is set in the space between a transparent double glass cylinder 8 and an outer cylinder 10 and the space is evacuated to vacuum or filled with an inert gas. The molten raw material is extruded to an injection cylinder 23 by a feed plunger 19 and then injected into molds through a nozzle 16 by a plunger 25.

Description

[Detailed description of the invention] (Field for 1j of “Industry”) The present invention relates to a plastic molding machine.

(Construction and configuration of conventional example and its problems) A conventional molding machine of this type is constructed as shown in FIG. In Fig. 1, 1 is a hopper for inputting plastic raw materials, 2 is an injection cylinder that melts raw materials and injects the molten raw materials into a mold, and 3 is an injection cylinder 2.
4 is a screw, 5 is a band heater provided on the outer periphery of
is a motor, a 6id speed reducer, and 7 is a drive cylinder that linearly moves the scree-4.

In the above configuration, the rotation of the motor 5 is transmitted to the screw 4 via the reducer 6, the screw 4 rotates, and the raw material supplied from the hopper 1 is sequentially transferred to the front of the injection cylinder 2 by the screw/IK. Ru. At this time, the raw material is melted or plasticized by the shear heat generated by the rotation of the screen -4 and the heating by the row heater 3, and is accumulated in the front part of the injection cylinder 2. Next, the drive cylinder 7 is operated, and the molten raw material is injected/injected by the advancing screen 4.
It is injected from the tip nozzle of the cylinder 2 and injected into the mold.

However, in the conventional example configured in this way, the screw 4 performs rotational movement and linear movement in the axial direction, so the structure is complicated, and separate drive sources are provided for both movements. There was a need. 1, screw
The machining of the injection cylinder 2 itself is complicated, and it is necessary to provide a check valve or the like (not shown) at the tip of the injection cylinder 2.
Since a large number of heaters 3 are arranged around the outer periphery of the mold, there are many disconnection accidents, and it takes a long time to raise the temperature with a multiple heater configuration. there were. For this reason, problems have arisen, such as, for example, the molding machine and the assembly line may become a major hindrance in connection or synchronized operation.

(Objective of the Invention) The present invention id: 1m This is to solve the problems of the conventional example, and to provide an injection molding machine that enables phantom time melting of raw materials and is aimed at improving reliability. It is.

[Structure of the Invention] The present invention comprises an infrared lamp in which a filament is arranged in a space between an inner cylinder and an outer cylinder of a double cylinder made of transparent glass, and a reflector provided to surround this infrared lamp. A raw material heating cylinder is constructed, and the raw material heated and melted in this heating cylinder is transferred to an injection cylinder through a feed granger, and is injected into a molding die.

As described above, in the present invention, since an infrared lamp is used to melt the raw material, the raw material reaches a predetermined temperature and melts in just a few minutes. Therefore, it is easy to restart after molding is interrupted, and especially for one assembly. This is extremely advantageous for synchronized operation with the conveyor.

(Explanation of Examples) Hereinafter, embodiments will be described in detail based on the drawings.

Fig. 2 shows an embodiment of the present invention, where 8 is an inner cylinder made of transparent glass, and 9 is arranged around the outer circumference of this inner cylinder 8 in a coil shape as shown in Fig. 3. 10 is an outer cylinder made of transparent glass that covers the outside of the filament 9. Both ends of the outer cylinder 10 are welded to the inner cylinder 8 by seals 11, and a space 2 is formed between the two ends.
0 is kept in a vacuum or filled with an inert gas such as nitrogen to isolate it from air. Inner cylinder 8 and outer cylinder I with 9 filaments
It is held so as not to come into contact with O, and its drawn-out portion is sealed with a sealing material 12. The infrared lamp is configured with the above structure. 13 is a connecting plate] provided on the inner surface of 4;
A reflector surrounding the infrared lamp directs all the light emitted by the infrared lamp inward. Note that a cooling water channel (not shown) is provided on the back surface thereof. The raw material heating/linda consists of an infrared lamp and a reflector. One end of the inner cylinder 8 is engaged with and supported by a metal 7 flange 21, and the other end is engaged and supported by an underframe 17, and a filled cylinder 1 is held in the cylinder.
The feed plunger 19 of No. 8 is adapted to slide. Reference numeral 15 denotes a thermocouple for temperature control, which is embedded close to the flange 21 and the inner wall of the inner cylinder 8.

Reference numeral 23 denotes an injection flange having an injection nozzle 16 at its tip, and is connected to the -raw material heating/cylinder via an on-off valve 22. 25 is driven by the driving cylinder 24
υ1, which moves linearly within the injection cylinder 23; 26 is a heater for keeping warm; 27 is a bobber for feeding raw materials; and 28 is a guide for the feed plunger 19.

Next, the operation of one cycle of this embodiment will be explained.

First, the raw material is supplied from the hopper 27 into the raw material heating cylinder, and the raw material is continuously heated and melted by the infrared light emitted from the filament 9 and the reflected light from the reflection plate 13. Next, when the valve 22 provided on the flange 2 is opened and the feeder cylinder 18 is operated, the feed plunger 19 is lowered and the molten raw material is pushed out and supplied into the injection cylinder 23. Next, in step A, close the valve 22,
When the drive cylinder 24 is actuated, the plunger 25 advances, and the molten raw material follows the nozzle 16 and is injected into the mold. After injection is completed or during injection, the raw material for the next shot is supplied into the heating cylinder and heated and melted.

(Effect of Startup) As explained above, according to the present invention, infrared light is irradiated from the outer wall 1 of the transparent glass cylinder to heat and melt the raw material. In comparison, the material melting time is shorter and the number of breaks in the heater is smaller.In addition, by providing the injection cylinder and material melting cylinder separately, ``high injection pressure is not applied to the glass/cylinder, and the strength is increased. High reliability can be obtained on the surface.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional in-line screw set injection machine, and Fig. 2 is a configuration diagram of an embodiment of the present invention.
FIG. V is a cross-sectional view of the heating and melting part of FIG. 2. 8...Inner tube, 9...Filament, 10...Outer tube, 13...
...Reflector, 16...Nozzle, 18-...
・・・・・・Feed cylinder, 19 ・・・・・・
・Feed plunger, 22... Valve, 23... Injection cylinder, 24°゛・°
°°゛° Drive cylinder, 25... Plunger, 27... For hopper patent - Applicant Matsushita Electric Industrial Co., Ltd. Figure 1 ζ Figure 2 119- @ Figure 3 0

Claims (1)

[Claims] A filament is arranged in the space between the inner cylinder and the outer cylinder of a double cylinder made of transparent glass, and the space is evacuated or filled with inert gas to make this a red evening single-ray lamp, and A raw material heating cylinder formed by surrounding the outer periphery of this infrared lamp with a reflector, a hopper for supplying raw material to the raw material heating cylinder, a feed plunger for discharging 411i L of the raw material melted in the raw material heating/cylinder, and an extruder. Also, melt layer: Log 1 is received t1. An injection molding machine characterized by comprising an injection cylinder that injects from a nozzle into a mold.