JPH0737852Y2 - Nozzle touch mechanism of vertical electric injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electric injection device in which an electric motor kneads and measures a molding material, and a screw is used when the kneaded molding material is injected into a mold. The present invention relates to a nozzle touch mechanism in which the nozzle of No. 1 is pressed against a mold.

[Conventional technology]

In injection molding, when injecting the molding material in the heating cylinder into the mold from the nozzle at the tip of the cylinder, it is possible to inject the molten material by pressing it into the mold inlet so that the molten molding material does not leak from the nozzle. Has been done.

Conventionally, in order to generate this nozzle touch, a hydraulic cylinder is provided in parallel with the screw so that the die is pressed against the heating cylinder, and the nozzle is touched by driving the cylinder.

[Problems to be solved by the device]

However, when the conventional hydraulic cylinder mechanism is provided around the heating cylinder, there is a problem in that the entire injection device becomes large and the device becomes complicated.

On the other hand, the inventors of the present invention have devised an electric injection device that is smaller than the conventional injection device and has a slim structure that can be installed vertically. However, when a conventional nozzle touch mechanism is attached to the electric injection device, the device becomes large in size, and a new nozzle touch mechanism suitable for an injection device having a small and slim structure has been desired.

The present invention is based on such a situation,
It is an object of the present invention to provide a nozzle touch mechanism which is configured by a simple mechanism and is suitable for a small and slim injection device.

[Means for Solving the Problems]

In order to solve the above problems, the nozzle touch mechanism of the electric injection device of the present invention comprises a screw for kneading and measuring a molding material in a heating cylinder, a means for rotationally driving the screw, and an injection drive for the screw. And an injection unit having a means for supporting the injection unit on the frame, and the frame is mounted so as to be movable relative to the base of the main body of the apparatus holding the mold by screw driving, and the nozzle of the heating cylinder and the mold are brought into contact with each other. The feature is that the nozzle is touched by the tightening force of the rear screw and the weight of the frame.

[Action]

In the above structure, the frame can be moved relative to the main body base by screw drive. The frame is equipped with a heating cylinder, and the mold is held on the base of the main body.Therefore, when the frame is moved in the mold direction with respect to the base of the main body, the nozzle of the heating cylinder is tightened by the lead of the screw and fixed to the mold. Nozzle touch force is generated due to pressure contact.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an electric injection device according to the present invention.

FIG. 2 is a partially cutaway enlarged view of the nozzle touch portion of the electric injection device shown in FIG.

The injection device shown in FIG. 1 is configured vertically, and 1 is a frame that supports the injection unit 10 by upper and lower mold holding beams 1a and 1b, and 2 is a frame 1 that is guided along a guide. It is a main body base portion that supports slidably in the vertical direction. The upper die holding beam 1a of the frame 1 is cut with a female screw 6 which is screwed into the screw rod 3, and a stator 4 is fixed to the side surface of the main body base 2, and the lower end of the screw rod 3 is rotated on the stator. Held possible. Therefore, the handle 5 fixed to the upper end of the screw rod 3
The frame 1 can be screw-driven by moving the right and left to move up and down relative to the main body base 2.

The injection unit 10 supported by the frame 1 includes a heating cylinder 11 containing a screw (not shown).
And the rotary shaft 13 fixed to the rear of the screw,
A straight moving mechanism 14 having a ball screw and a ball nut (not shown) connected to the upper portion of 13 and an injection motor 15 connected to the ball screw, and the upper end portion of the straight moving mechanism 14 has an upper mold holding. The injection unit is fixed to the beam 1a and the upper end of the heating cylinder 11 is fixed to the lower mold holding beam 1b.
The whole 10 is supported by the frame 1.

A driven gear 16 is fixed to the rotary shaft 13, and a drive gear 17 engaged with the gear is fixed to a rotary shaft of a kneading / measuring motor 18 fixed to the lower die supporting beam 1b.

Below the middle cantilever 1b of the main body base 2, a support beam 2a for supporting the upper die mounting plate 20 is provided.
An upper die 21 is fixed to a lower portion of the lower die 20, and a lower die mounting plate 22 for fixing a lower die 23 is provided below the upper die 21 so as to face the upper die 21. A heating cylinder is used for the support beam 2a and the upper die mounting plate 21.
A through hole that allows the 11 to move up and down is opened, and a nozzle 19 provided at the tip of the heating cylinder is provided with a recess around the inlet of the upper mold 21.
It is designed to come into contact with 21a (see FIG. 2).

The nozzle touch on the upper mold 21 of the nozzle 19 is performed by rotating the handle 5 and lowering the frame 1 relative to the main body base 1 as described above. At this time, screw rod
The tightening force of 13 causes a nozzle touch force of several hundred kg on the recess 21a around the injection port of the upper mold 21.

The lower die mounting plate 22 is provided with a link 24, and when this ring is moved up and down by an air cylinder 25, the lower die 23
Can contact the upper mold 21.

A hopper 30 is connected to the heating cylinder 11 via a pipe 31, and the molding material charged into the hopper is kneaded and melted in the heating cylinder 11.

Next, the operation of the injection device having the above configuration will be described.

Prior to the injection molding, the handle 5 of the screw rod 3 is manually turned to lower the frame 1 to bring the nozzle 19 into pressure contact with the recess 21 a around the injection port of the upper mold 21. Then, the nozzle 19 is tightened until the nozzle touch force with respect to the inlet peripheral recess 21a reaches a predetermined magnitude. The injection device of the present embodiment is configured as a hot runner in which the runner portion keeps the molding material passing therethrough in a molten state, and at the time of injection molding, the nozzle touch force is constantly increased to a predetermined value by the tightening force of the screw rod 13. I try to keep it.

On the other hand, the air cylinder 25 is driven to extend the link 24, and the lower mold 23 is brought into contact with the upper mold 21 to form a predetermined molding cavity between the upper and lower molds.

Further, by putting the molding material into the hopper 30 and rotating the kneading / measuring motor 18, the drive side gear 17 and the driven side gear
The screw is rotated through 16 and the rotary shaft 13 to knead and measure the molding material. As the kneading and metering progress, the molten molding material accumulates in front of the screw, and the screw gradually retracts. In this way, when a predetermined volume of the molten molding material is accumulated in front of the screw, the kneading / measuring motor 18 is stopped.

Next, when the injection motor 15 is rotationally driven, this rotational motion is converted into a linear motion by the action of the ball screw and the ball nut of the linear cylinder, the screw is pushed out through the rotary shaft 13, and the molten molding material accumulated in front of the screw. Up and down
It is injected into the cavities 21 and 23. At this time, the above-mentioned nozzle touch prevents the molten molding material from leaking from the recess 21a around the injection port, and after the cooling process after molding, the air cylinder 25 is driven to shrink the link 24 to lower the mold.
Lower 23 to open the mold, and then take out the molded product.

In the nozzle touch mechanism of such an electric injection device, a predetermined nozzle touch force can be easily generated by manually rotating the handle 5 and tightening the screw rod 13. Further, the threaded rod 13 can be constructed very simply and can maintain its slim shape even when it is attached to the vertical injection device of this embodiment.

In addition, at the time of maintenance of the nozzle portion of the injection apparatus of the present embodiment, the handle 19 may be rotated to raise the frame 1 to remove the nozzle 19 from the upper mold 21.

Further, although the nozzle touch mechanism of the present embodiment is configured to be attached to the vertical injection device, it is naturally attached to the horizontal injection device, and the same effect can be exhibited.

[Effect of device]

As described above, since the nozzle touch mechanism of the electric injection device of the present invention is designed to perform nozzle touch by moving the heating cylinder with respect to the mold by screw drive, it can be configured with a simple mechanism. , Even if each element of the injection device is configured in a slim shape provided on the propelling shaft of the screw, the slim appearance is not lost,
For example, it is also suitable for a small and slim vertical injection device.

In addition, since the nozzle touch mechanism using this screw drive makes the nozzle touch by the screw tightening force after contact and the weight of the frame, it is not necessary to hold the nozzle touch force with a brake or the like, and the configuration can be simplified and the manufacturing cost can be reduced. Not only the running cost is reduced, but also the running cost can be reduced because it can be configured to be easily operated manually.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an electric injection device according to the present invention. FIG. 2 is a partially cutaway enlarged view of the nozzle touch portion of the electric injection device shown in FIG. 1 …… Frame 2 …… Main body 3 …… Screw rod 4 …… Stator 5 …… Handle 10 …… Injection unit 11 …… Heating cylinder 15 …… Injection motor 18 …… Kneading / Measuring motor 21 …… Upper mold 23 …… Lower mold

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-85914 (JP, A) JP 62-80014 (JP, A) JP 62-9925 (JP, A) Actual development Sho 63- 82519 (JP, U) Actual development Sho 58-89317 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A body base of an injection molding machine is vertically arranged vertically, a frame member is attached by a screw and a handle so as to be relatively movable in a vertical direction of the body base, and an injection nozzle is provided in a vertical direction of the frame member. A heating cylinder, a rotary shaft, and a linear movement mechanism of the rotary shaft are attached to the frame member, and a mold member provided with a resin injection part is arranged at a position where the injection nozzle is lowered. The driving means is arranged, and the frame member is lowered by the rotation operation of the handle, and the injection nozzle is brought into pressure contact with the resin injecting portion of the mold member to perform a nozzle touch. Nozzle touch mechanism of the characteristic vertical electric injection device.