JPS61118224A - Simultaneously extruding device of large number of irregular-shaped molded articles - Google Patents

Abstract

PURPOSE:To enable to perform simultaneous extrusion molding of irregular- shaped molded articles at even speed, by a method wherein a plurality of flow path holes are bored on the tip of a main flow path cylinder of a head body, through which a flow of molten substance flowing into said flow path hole is controlled. CONSTITUTION:An air inflow port 21 provided on a head body 3 is opened at a part corresponding to an annular groove of an inner mold. The title extruding device is so constituted that though a rubber material molten by a molding cylinder 1 arrives at a die by passing through a breaker plate 4 and main flow path cylinder 5, a flow adjusting plunger 9 is protruded on a wall surface of flow path hole of this side of the die. As discharge speeds through both of the dies can be made even by adjusting appropriately a quantity of protrusion of the plunger 9, two tubes whose diameters are different from each other can be extruded through the dies at the equal speed irrespective of the sizes of the tubes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for simultaneously extruding a large number of irregularly shaped articles, which can simultaneously extrude a plurality of irregularly shaped articles having different shapes and sizes using seven extrusion molding machines.

Conventionally, in order to extrude hollow products such as tubes, solid rod products, and other molded products using extrusion molding machines, it has become common practice to extrude seven molded products using seven extrusion molding machines. Therefore, in order to make multiple irregularly shaped molded products at the same time, multiple extrusion molding machines must be prepared individually, and multiple devices for post-extrusion processing are also required. However, since the installation location occupies a large area, it is not economical as a whole. On the other hand, even if a plurality of dies are simply attached to an extruder to obtain a plurality of irregularly shaped products at the same time, the discharge speed of the molten material from each die will be different, making it impossible to obtain products with the desired dimensions.

For example, to extrude two tubes with different diameters from a rubber material, if you attach two dies to an extrusion molding machine according to the inner and outer diameters of each tube, the extruded tubes will be processed in the post-processing process. When the tube is guided to a pulling machine or continuous vulcanization equipment, the tube on the side with a slow discharge speed and the tube on the fast side (
= It is stretched to match the belt speed of the pulling device, and the inner diameter, outer diameter, wall thickness, etc. are not finished to the specified dimensions,
This may cause defective products.

In order to avoid such troubles, there are known methods that use double-headed heads or supply lubricant to the surface of the molten material, but
In either case, the mechanism is complicated, the number of steps required for cleaning after use is increased, and handling is troublesome.

The present invention eliminates such drawbacks and has various other features, and includes a plurality of flow holes formed at the tip of the main flow cylinder of the head body, and the molten material flowing into the flow holes. The flow rate of the molten material is adjusted by a regulating plunger, and the molten material is discharged from the die provided at the tip of each channel hole at a nearly constant speed, making it possible to simultaneously extrude irregularly shaped products at a constant speed. .

According to the apparatus of the present invention, rod-shaped solid bodies, hollow pipes, and other molded products can be extruded, and
Various extrusion materials such as rubber, plastic, thermoplastic elastomer, etc. can be used.

Hereinafter, a case will be described in which two irregularly shaped tubes are extruded from a rubber material.

The head body (3) is attached to the tip of the molding cylinder (1) of the extrusion molding machine via the fastening flange (2), and is connected to the main flow cylinder (5) following the breaker plate (4).
It has a jacket (6) on the wall.

Two flow passage holes (7) are bored at the tip of the main flow cylinder (5), and the number of flow passage holes may be three or three depending on the number of molded products to be molded at the same time. More than one number can be provided.

An adjustment hole (8) is opened in the wall surface of the channel hole.

A flow rate adjusting plunger (9) is inserted into the adjusting hole so that the plunger (9) can move forward and backward so that its tip protrudes into the flow path hole (7).

The plunger (9) has an inner cylinder αO at the rear, and the inner cylinder αO
) The cylinder is fitted into the outer cylinder α9.

Various configurations can be used to move the plunger forward and backward, for example, the rear end of the inner cylinder is threadedly engaged with the outer cylinder, and the outwardly projecting portion of the outer cylinder is directly rotated to move the plunger forward and backward. , a rack is provided at the rear of the plunger, and a pinion pivotally supported on the outer cylinder is engaged with the rack to rotate and move the pinion, or a threaded rod is screwed into the outer cylinder and the threaded portion of the screw rod is engaged with the rack. Another threaded part having a pitch difference from that of the threaded part is provided inside the threaded rod, and the rear part of the plunger, which is prevented from rotating, is screwed into the inner threaded part, and by rotating the threaded rod, the plunger is moved in a linear direction. A fine linear motion mechanism for fine movement may be provided, or the manual operation may be supplemented with a servo motor, pulse motor, or other control mechanism.

A die is provided at the tip of the channel hole (7). The die shown in the figure includes a cylindrical outer mold α3 having a die with a conically tapered inner surface and a land υ formed at the tip, and a cylinder holding a nozzle αO in the center by means of a spider α. The outer mold and the inner mold are each removably fitted into the flow passage hole (7).

A part of the outer peripheral surface of the inner mold αO is formed into a shallow annular shape,
A ventilation hole αe is formed in the annular groove αη.

The ventilation hole passes through the spider αφ and the nozzle αθ.
It has an opening at the tip. In use, the inner mold and the outer mold are assembled with the tip of the nozzle inserted into the die, and pushed from the front of the flow passage hole (7), so that the inner peripheral edge of the inner mold forms a step formed in the flow passage hole. Insert until part (to) C2 makes contact.

Air inflow ports Qρ provided in the head body (3) are opened at portions corresponding to the annular grooves α of the inner mold α0.

A presser plate is attached to the front surface of the head body to hold the front end surface of the outer mold α3.

The rubber material melted by the molding cylinder (1) is then transferred to the breaker plate (4), the main flow cylinder (
5) A flow rate adjustment plunger (9) protrudes from the wall of the channel hole in front of the die, so it is compatible with a die that molds a large diameter tube. If the tip of the plunger (9) is made to protrude into the channel hole more than the plunger corresponding to the other die, the discharge speed of the molten material discharged from the die corresponding to the larger diameter becomes slower.

By appropriately adjusting the protrusion amount of the plunger,
Since the discharge speeds from both dies can be made approximately equal, two tubes with different diameters can be extruded from the die at the same speed regardless of the diameter of the tubes.

Therefore, even if two tubes are simultaneously fed into a belt of a subsequent vulcanization device such as a microwave vulcanization device or a hot air heating device, or a take-up machine, one of the tubes will not be stretched.

If the discharge speed of any of the tubes changes, the plunger can be moved back and forth to adjust it.

In addition, as shown in Fig. 9, the extruded molded product), (
Sensors (c) and (4) to detect the degree of sagging of the molded product are installed at appropriate positions, and when the sagging of one molded product becomes large,
A control circuit may be provided to automatically rotate the adjustment bolt to control the amount of protrusion of the plunger based on the detection signal of the sensor.

In the case shown in the figure, when the presser plate () is removed after molding is completed, the dies of the outer mold α3 and the inner mold aO are pushed out in front of the head body by the molten material, and then the fastening flange (2) can be removed to clean the head body very easily.

The present invention is configured as described above, and can extrude irregularly shaped molded products simultaneously at a constant speed, and is economical because a plurality of molded products of predetermined dimensions can be obtained using seven extrusion molding machines.

Of course, molded products of the same shape can be obtained by making the shapes of each die and nozzle the same.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view, FIG. 2 is an enlarged partially cutaway perspective view of the outer mold, FIG. 3 is a partially cutaway enlarged perspective view of the inner mold, and FIG. It is an explanatory view of an example of rapid extrusion. l...Forming cylinder 3...Head body 5...Main passage cylinder 7...Flow passage hole 9...Flow rate adjustment plunger Figure 1 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A plurality of flow passage holes are formed at the tip of a main flow cylinder of a head body that is attached to a molding machine, adjustment holes are drilled on the wall surface of the flow passage holes, and a die is provided at the tip. A flow rate adjusting plunger is provided in the adjusting hole so that its tip protrudes into the flow path hole, and the amount of protrusion of the adjusting plunger is adjusted to extrude the molten substance from each die at a substantially constant speed. Multiple extrusion equipment for irregular shaped products. 2. The die is composed of an outer die having a die and an inner die having a nozzle, and the outer die and the inner die are combined with the tip of the nozzle inserted into the die, and the die is fitted into the flow passage hole. An apparatus for simultaneously extruding a large number of irregularly shaped products according to claim 1.