JPH077134Y2 - Injection machine injection machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an injection device of an injection molding machine for injection molding a resin molded product.

(Prior Art) FIG. 2 shows an injection device of a conventional injection molding machine. In this figure, 1 is a mold, and the mold 1 has a molding recess 2 for forming a molded product therein. The injection device 5 for injecting the molten resin into the mold 1 through the nozzle 3 at the tip includes a screw cylinder 7 in which a screw 6 is slidably arranged, and an injection piston integrated with an injection rod 8. 9 is provided with a hydraulic cylinder 10 slidably disposed therein. Here, the screw 6 and the injection rod 8 are integrated, and the position / speed detection member 11 is attached to the injection rod 8. The injection rod 8, that is, the screw 6 is rotated by an oil motor 12. A hydraulic source 13 and a hydraulic servo valve 14 are provided to drive the hydraulic cylinder 10. Further, a setting device 15 for setting conditions of the position (movement amount) and speed of the injection rod 8, a comparison calculator 16,
Further, a position / speed detector 17 for detecting the position and speed of the injection rod 8 based on the information from the position / speed detecting member 11 is provided. The comparison calculator 16 compares the set value of the setter 15 with the detected value of the position / speed detector 17, and controls the hydraulic servo valve 14 via the servo amplifier 18.
Reference numeral 20 is a hopper for supplying the resin into the screw cylinder 7.

With the above configuration, the oil motor 12 is used to screw 6
A certain amount of resin is supplied from the hopper 20 by rotating the screw cylinder 7 by a certain amount, and the resin in the screw cylinder 7 is melted by the rotating action of the heating means and the screw 6 arranged on the outer periphery of the screw cylinder 7. And
The hydraulic power source is supplied to the hydraulic cylinder 10 according to the setting conditions of the setting device 15.
Hydraulic pressure is supplied from 13 via the hydraulic servo valve 14, the injection piston 9 moves, and accordingly, the screw 6 moves in the direction of the nozzle 3 to inject the molten resin into the mold 1 through the nozzle. As a result, a desired molded product is obtained in the molding recess 2 in the mold.

(Problems to be solved by the invention) By the way, in the case of the conventional configuration shown in FIG. 2, various molding conditions can be set and various kinds of molded products can be manufactured, but a complicated control method is required, The cost is also high.

On the other hand, when it is used for manufacturing one kind of product, the molding conditions are limited, the condition change becomes a part, and the necessary control, function and ability are also limited. In the configuration of FIG. It will have control, function, and ability, and it will be an expensive facility more than necessary.

The present invention aims to provide an injection device of an injection molding machine that simplifies the configuration by driving a screw for injecting a molten resin by a cam drive and can change the injection speed quickly without a response delay. To aim.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention relates to an injection device of an injection molding machine, in which a molten resin is injected through a nozzle into a mold having a molding recess, in a screw cylinder. A screw slidably disposed on the cam mechanism is moved by a cam mechanism.

(Operation) In the injection device of the injection molding machine of the present invention, the screw slidably arranged in the screw cylinder is driven by the cam mechanism adapted to the specific molding conditions, and various molding conditions are supported. The conventional control system provided to do this, that is, the injection speed detection / calculation / output circuit,
Servo valves / servo motors etc. are not required, and the configuration can be simplified and downsized. Further, since it is driven by a cam, the injection speed can be swiftly switched without a response delay at the changing portion of the rising and falling of the injection speed.

(Embodiment) An embodiment of an injection device of an injection molding machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is an embodiment of the present invention, which is an injection device for injecting a molten resin into a mold 1 through a nozzle 3 at the tip.
5A is a screw cylinder 7 in which a screw 6 is slidably arranged, and an injection cam 30 that abuts on and drives an extended end 8A of an injection rod 8 integrated with the screw 6.
A metering drive source 31 and an injection cam drive source 32. Here, the metering drive source 31 is, for example, a motor, and is configured to receive a constant amount of resin supply from the hopper 20 by rotating the injection rod 8 and the screw 6 through a gear mechanism 33 by a constant amount. Also, the injection cam drive source
Reference numeral 32 denotes, for example, a motor, and a belt is wound around the motor-side pulley 34 and a pulley 35 coaxial with the injection cam 30, and thereby the rotational force of the motor is transmitted to the injection cam 30. This injection cam drive source 32 intermittently sets the injection cam 30 to 1
It has the function of rotating.

In the configuration of the above embodiment, a certain amount of resin is supplied from the hopper 20 by rotating the screw 6 by the metering drive source 31 by a certain amount, and the heating means arranged on the outer periphery of the screw cylinder 7 and the rotating action of the screw 6 As a result, the resin in the screw cylinder 7 becomes molten. Then, the injection rod 8 moves according to the cam curve of the injection cam 30 (which is uniquely determined by the setting conditions of the position and speed of the injection rod 8), and accordingly the screw 6 moves in the direction of the nozzle 3 to pass the molten resin through the nozzle. It is injected into the mold 1. As a result, a desired molded product is obtained in the molding recess 2 in the mold.

(Effect of the Invention) As described above, the injection device of the injection molding machine of the present invention is configured to execute the injection of the molten resin by the cam mechanism. (1) When the injection is performed by the conventional complicated hydraulic system In comparison, injection speed detection / calculation / output circuit, servo valve /
Servo motors are not required, and the drive source is also small, so equipment can be simplified, downsized, and costs can be reduced. (2) Cam drive allows injection speed to rise and rise. There is an advantage that the injection speed can be quickly switched without a response delay in the downward change portion.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an injection device of an injection molding machine according to the present invention, and FIG. 2 is a configuration diagram of an injection device of a conventional injection molding machine. 1 ... Mold, 2 ... Recess for molding, 3 ... Nozzle, 5,5A ...
... injection device, 6 ... screw, 7 ... screw cylinder, 8 ... injection rod, 20 ... hopper, 30 ... injection cam, 31 ... metering drive source, 32 ... injection cam drive source.

Claims (1)

[Scope of utility model registration request] 1. In an injection device of an injection molding machine for injecting a molten resin through a nozzle into a mold having a molding recess, a screw mechanism slidably disposed in a screw cylinder is moved by a cam mechanism. An injection device of an injection molding machine characterized by.