JPS6319323B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a raw material supply device for an injection molding machine.

[Prior art]

Recently, in-line injection molding machines have been widely used as injection molding machines, and the screw in the in-line injection molding machine is gradually retracted during measuring to plasticize and store raw materials. As the screw recedes, the effective screw length decreases, and as the effective screw length decreases, the amount of plasticization of the screw decreases. For this reason, conventionally, a screw-shaped feed shaft was provided inside the hopper to forcibly feed the raw material, and this feed shaft was rotated by an electric motor located above the hopper. Although it is possible to supply raw materials using this method, it has the following drawbacks.

1. The structure is large and the cost is high.

2. Maintenance such as cleaning is required because the rotating part is inside the hopper.

3. The electric motor, which is the rotational drive source, is installed above the hopper, which is inconvenient when feeding raw materials into the hopper.

[Purpose of the invention]

The purpose of the present invention is to install a guide cylinder with guide vanes inside between the hopper and the heating cylinder, and to actively supply raw materials by applying vibration to this guide cylinder. An object of the present invention is to provide a raw material supply device for an injection molding machine.

[Key points of the invention]

The raw material supply device for an injection molding machine in the present invention includes:
Consisting of a hopper, a heating cylinder, a guide cylinder installed between the hopper and the heating cylinder and having a plurality of guide vanes on its inner circumference inclined with respect to the vertical axis of the hopper, and an oscillator that applies vibration to the guide cylinder. It is characterized by

[Embodiments of the invention]

The present invention will be explained below with reference to FIGS. 1 to 3 showing one embodiment. In Figure 1,
A screw 12 is inserted into the heating cylinder 11, which rotates and moves in the left-right direction in the figure. A hopper 14 is attached to the heating cylinder 11 through a frame 15 above the raw material supply hole 13 of the heating cylinder 11, and an elastic support such as a spring is provided between the top of the hole 13 and the bottom of the hopper 14. The guide tube 17 is attached with the body 16 placed,
A plurality of guide vanes 18 are provided on the inner periphery of the guide tube 17, as shown in FIGS. 2 and 3, and are inclined at an angle with respect to the vertical axis of the hopper 14. An oscillator 19 is attached to the heating cylinder 11 near the guide tube 17, and the oscillator 19 and the guide tube 17 are connected to a rod 20.
connected by.

Next, the operation of the embodiment described above will be explained.
When weighing, raw materials are put into the hopper 14, the screw 12 is rotated, and the oscillator 19 is activated.The raw materials in the guide tube 17 are divided by a plurality of guide vanes 18, so they do not become lumps, and the oscillator 19 Since it is vibrated by the heating cylinder 11, it is actively supplied into the heating cylinder 11 through the hole 13. At this time, the screw 12 moves backward with time during metering and the effective screw length decreases, so the raw material can be fed more smoothly if the amplitude or frequency of the oscillator 19 is increased as time elapses during metering. Also, during injection, the oscillator is activated to send the raw material to the screw groove while the screw advances, and the vibration frequency is increased at the start of injection and gradually decreased until the injection is completed, thereby efficiently distributing the raw material. This is suitable because it can be sent in.

〔Effect of the invention〕

As explained above, in the present invention, a guide cylinder having guide vanes on the inner periphery is provided between the heating cylinder and the hopper, and this guide cylinder is vibrated by an oscillator, so that the raw material on the inner periphery of the guide cylinder is moved by the guide vanes. Since it is divided and subjected to vibration, it is actively fed into the heating cylinder without clumping together. Furthermore, since the guide tube and the oscillator are only added to the injection molding machine, the cost is low, and since there are no movable parts inside the hopper and the guide tube, no maintenance is required. Furthermore, since there are no accessories such as electric motors on the upper part of the hopper, it has many advantages such as easy feeding of raw materials.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, and FIG. 1 is a sectional view of a main part of an injection molding machine, FIG. 2 is a plan view of a guide tube, and FIG. 3 is a sectional view of the guide tube. 11... Heating cylinder, 14... Hopper, 1
7... Guide tube, 18... Guide vane, 19... Oscillator.

Claims (1)

[Scope of Claims] 1. A hopper, a heating cylinder, and a guide cylinder that is installed between the hopper and the heating cylinder and has a plurality of guide vanes on its inner periphery that are inclined with respect to the vertical axis of the hopper. A raw material supply device for an injection molding machine consisting of an oscillator that applies vibration to the guide tube. 2. The raw material supply device for an injection molding machine according to claim 1, wherein the amplitude or frequency of the oscillator is increased as time elapses during measurement.