JPH0957754A - Device for supplying rubber material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely separate an adherence preventive agent applied to a rubber material from the rubber material. SOLUTION: An adherence preventive agent collecting hopper 24 is set in an upwardly faced posture in the central part within the separation vessel 21 of an adherence preventive agent separator 20. An adhesive preventive agent separation filter 25 with its shape curved upward is laid on the upper surface of the adherence preventive agent collector hopper 24. By vacuum suction forces generated by a vacuum pump, rubber material A at the storage hopper 11 side is placed from the placing inlet 22 into the separation vessel 21 passing through a vibration sieve 13 and a pipe 14, and thereby it falls near the top of the adherence preventive agent separation filter 25. At this time, a talc powder B adhered to the rubber material A is separated and collected in the adherence preventive agent collecting hopper 24, on the other hand, the rubber material A with the talc powder B separated falls downward and supplied to an extruding machine 17 via a storage hopper 15 and pipe 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for feeding a rubber material to an extruder for extrusion-molding a sealing material typified by weather strips for automobiles.

[0002]

2. Description of the Related Art FIG. 2 shows a main part of a conventional device of this type.
The pellet-shaped rubber material A stored in the storage hopper 8 is
It is sucked into the anti-adhesive agent separator 3 to be described later through the pipe 1 by the negative pressure suction force of the vacuum pump 9, and then supplied from the pipe 2 at the bottom of the separation container 4 of the anti-adhesive agent separator 3 to the extruder 10. . The rubber material A supplied to the extruder 10 is extruded as a molded product such as a sealing material through steps such as heating and kneading.

Rubber material A stored in the storage hopper 8
In order to prevent the rubber materials A from sticking to each other at the storage stage, a powdery adhesion preventing agent B such as talc powder is applied to the surface of the above. However, the talc powder B is not dissolved by the vulcanization heat of about 120 degrees, and when it is supplied to the extruder 10 together with the rubber material A, it remains as a white foreign matter in the molded product. Further, when high-frequency vulcanization is performed in the extruder 10, the moisture absorbed in the talc powder B foams, leaving foaming marks on the molded product. In order to eliminate such a problem, an anti-adhesive separator 3 for separating the talc powder B from the rubber material A is provided in the middle of the pipes 1 and 2.

The anti-adhesive separator 3 has a separation container 4 connected to the pipes 1 and 2 and an upper lid 5 of the separation container 4 at one end.
Of the anti-adhesion agent discharge pipe 6 connected to the vacuum pump 9 and the other end of which is attached to the vacuum pump 9 And a filter 7. Vacuum pump 9
The negative pressure suction is performed on the rubber material A stored in the storage hopper 8 into the separation container 4 through the pipe 1 against the negative pressure suction force of the vacuum pump 9.
It drops to the bottom and is supplied to the extruder 10 through a pipe 2 that opens at the bottom of the separation container 4.

In the separation container 4, the talc powder B separated from the rubber material A and floating in the separation container 4 is recovered by the negative pressure suction force through the adhesion preventive separation filter 7 to the vacuum pump 9 side. As a result, it is possible to reduce the mixing of the talc powder B into the rubber material A supplied to the extruder 10.

[0006]

However, in such a conventional apparatus, the rubber material A and the anti-adhesive agent B are not always sufficiently separated, and for example, the anti-adhesive agent B adheres to the surface of the rubber material A. And the rubber material A fall to the bottom of the anti-adhesive separator 3, and the anti-adhesive agent B is mixed in the rubber material A supplied to the extruder 10, and the white foreign matter remains in the molded product as described above. Etc. causes problems.

The present invention has been made in view of the above problems, and reliably separates the anti-adhesive agent applied to a rubber material,
It is an object of the present invention to provide a rubber material supply device capable of forming a high-quality rubber molded product by preventing admixture of an anti-adhesive agent from the extruder side.

[0008]

In order to solve the above-mentioned problems, a rubber material supplying apparatus according to the present invention is coated with a powdery anti-adhesive agent for preventing the rubber materials from sticking to each other. A storage means for storing the pelletized rubber material, and an anti-adhesive separator for separating the anti-adhesive agent from the rubber material, which is provided in the middle of the supply path for supplying the rubber material from the storage means to the extruder. A rubber material supply device provided with an anti-adhesion agent separator, comprising: a separation container into which the rubber material is charged through an upper inlet, and an anti-adhesion agent trap provided in a central portion of the separation container in an upward posture. The collecting hopper and the upper surface of the anti-adhesive agent collection hopper are provided so as to be curved upward, and the anti-adhesive agent is separated from the rubber material charged through the charging port, and the anti-adhesive agent is transferred to the anti-adhesive agent collecting hopper. Separation of anti-adhesive agent that collects and drops rubber material after separating anti-adhesive agent downward And a negative pressure suction means is connected to the anti-adhesive agent collection hopper, and an opening / closing valve is provided at the bottom of the separation container to suck the anti-adhesive agent in the anti-adhesion agent collection hopper under negative pressure. The rubber material on the storage means side is sucked to the separation container side by the negative pressure suction force of the negative pressure suction means in parallel with the suction on the means side.

The anti-adhesive agent is a so-called dusting powder which is dispersed on the surface of the rubber material. For example, talc powder, mica powder, zinc stearate, starch, or a starch derivative insoluble in water is used.

In the rubber material supply device thus constructed, the rubber material stored in the storage means passes through the supply path by the negative pressure suction force of the vacuum pump or the like serving as the negative pressure suction means, and goes above the separation container. It falls from the input port of to the anti-adhesive separation filter. The anti-adhesion agent attached to the rubber material is peeled off from the rubber material when it is dropped on the anti-adhesion agent separation filter or when the rubber material moves along the surface of the anti-adhesion agent separation filter which curves upward. The anti-adhesion agent thus peeled off and the anti-adhesion agent floating in the separation container are collected by the anti-adhesion agent collection hopper by a negative pressure suction force. Further, even when the anti-adhesive agent separation filter is clogged with the anti-adhesive agent and then drops, the anti-adhesive agent is collected by the anti-adhesive agent collection hopper located below. That is, the anti-adhesion agent is almost completely separated from the rubber material, the anti-adhesion agent is collected by the anti-adhesion agent collection hopper, and is sucked to the vacuum pump side by the negative pressure suction force. On the other hand, the rubber material after separation of the anti-adhesive agent drops from the anti-adhesive agent separation filter, is supplied to an extruder or the like through a supply passage, and is extrusion-molded as a rubber molded product.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a rubber material supply device according to an embodiment of the present invention.

The pelletized rubber material A stored in the storage hopper 11 is fed into the anti-adhesive separator 20 through the vibrating screen 13 and the pipe 14. The talc powder B applied to the rubber material A is separated in the anti-adhesive separator 20, and the separated rubber material A is supplied to the extruder 17 through the storage hopper 15 and the pipe 16 and undergoes a press molding process. It is extruded as a molded product S such as a uniform and long sealing material.

Storage hopper 11 for storing the rubber material A
Is for the purpose of preventing the rubber materials A from sticking to each other,
It is housed in a cooler (not shown) and the inside is kept at a predetermined temperature and humidity. In the rubber material A stored in the storage hopper 11, the unvulcanized rubber material is finely divided into pellets of about 3 to 10 mm, and in order to prevent the rubber materials A from sticking to each other on the surface, Talc powder B as an anti-adhesion agent is applied.

Between the opening 11a formed at the lower end of the storage hopper 11 and the suction port 14a of the pipe 14, there is provided a vibrating screen 13 forming a part of the supply path. The vibrating screen 13 is made of talc. It is formed of a wire mesh having a roughness that allows the powder B to pass through but does not allow the rubber material A to pass through. Of the rubber material A delivered from the opening 11a, the vibrating sieve 13 vibrates, so that the talc powder B applied to the rubber material A falls to the tray 12 below the vibrating sieve 13 as the primary treatment and is collected. The rubber material A that has not dropped from the vibrating sieve 13 moves to the downstream side with the inclination of the vibrating sieve 13, is sucked into the pipe 14 from the suction port 14a opening to the downstream side, and separates the anti-adhesive agent from the charging port 22a. It is put in the container 20.

The anti-adhesive agent separator 20 comprises a separation container 21 having a conical bottom portion, an anti-adhesion agent collecting hopper 24 provided in an upward posture at the center of the separation container 21, and the anti-adhesion agent separating hopper 24. The separation container 2 is configured by including an anti-adhesive separation filter 25 provided on the upper surface of the agent collection hopper 24 so as to be curved upward.
An inlet 22a into which the rubber material A is introduced from the pipe 14 is opened in the central portion of the upper lid 22 attached to the upper part of 1.

The anti-adhesive agent collecting hopper 24 is provided below the charging port 22a and in the center of the separation container 21 at a position separated from the inner wall of the separation container 21. Anti-adhesive agent collection hopper 24
An anti-adhesion agent discharge pipe 26 is connected to the lower end of the, and the other end of the anti-adhesion agent discharge pipe 26 is connected to the inside of the recovery hopper 27 to which the vacuum pump 18 is attached.

The anti-adhesive separating filter 25 attached to the upper edge of the anti-adhesive collecting hopper 24 has its center located substantially vertically below the inlet 22a and upward from the lower edge toward the center. It has a curved semicircular shape, and is formed by a metal net having a roughness such that the rubber material A can pass but the talc powder B cannot pass, or a stainless plate having innumerable holes.

The anti-adhesive agent collection hopper 24 communicates with the inside of the recovery hopper 27, and the interior of the anti-adhesive agent collection hopper 24 communicates with the inside of the separation container 21 via the anti-adhesive agent separating filter 25. That is, the recovery hopper 27 and the anti-adhesive agent collection hopper 2
4, the inside of the separation container 21 and the inside of the pipe 14 are communicated in a substantially sealed state, and the negative pressure suction force of the vacuum pump 18 causes the rubber material A on the vibrating sieve 13 to be sucked into the suction port 1
4a is sucked to the anti-adhesive separator 20 side.

Rubber material A charged through the charging port 22a
Falls near the top of the anti-adhesive separation filter 25. At this time, the talc powder B adhered to the rubber material A due to the impact when the rubber material A collides with the anti-adhesive separation filter 25.
Peels off. Next, the rubber material A moves along the surface of the anti-adhesive separation filter 25, and then the anti-adhesive separation filter 25.
More drops to the bottom of the separation container 21. During this movement, since the surface of the anti-adhesive separation filter 25 has irregularities formed by the wire mesh, the talc powder B adhering to the surface of the rubber material A
Peels off from the rubber material A. The talc powder B separated in this way and the talc powder B floating in the separation container 21 are almost completely collected by the anti-adhesion agent collection hopper 24 by the negative pressure suction force of the vacuum pump 18.

Further, even if the talc powder B is clogged in the mesh of the anti-adhesive separating filter 25, and the anti-adhesive B is dropped due to external vibration or the like while the vacuum pump 18 is not operating, The talc powder B is reliably collected by the anti-adhesion agent collection hopper 24 located below the anti-adhesion agent separation filter 25.

As described above, in this embodiment, the talc powder B applied to the rubber material A is effectively separated in the separation container 21 and collected in the anti-adhesion agent collection hopper 24.

The talc powder B collected in the anti-adhesion agent collection hopper 24 is sucked into the recovery hopper 27 through the anti-adhesion agent discharge pipe 26 by the negative pressure suction force of the vacuum pump 18, and the recovery hopper 27 base end portion. It is recovered in a recovery container (not shown) through the recovery port 29 formed in the above. The recovery hopper 27
A recovery filter 2 for recovering the talc powder B is provided between the opening of the anti-adhesion agent discharge pipe 26 and the vacuum pump 18.
8 is provided so that the talc powder B does not enter the vacuum pump 18 and become clogged.

On the other hand, the rubber material A after separation falls from the surface of the anti-adhesive separation filter 25 to the bottom of the separation container 21.
The bottom of the conical separation vessel 21 faces the inside of the storage hopper 15 of the extruder 17, and a so-called reed valve type opening / closing valve 23 is attached to the base end thereof.

The on-off valve 23 of this embodiment is composed of two opposed sheets 23a and 23b. These sheets 2
3a and 23b approach or separate from each other in accordance with the negative pressure suction force of the vacuum pump 18, so that the separation container 21
The discharge port 21a formed at the bottom is opened and closed. When the on-off valve 23 is closed, the separation container 21
The rubber material A that has dropped to the bottom is accumulated in the separation container 21, and when a predetermined amount of rubber material A is accumulated, the on-off valve 23 is pushed open and the rubber material A falls into the storage hopper 15.

Rubber material A charged in the storage hopper 15
Is supplied to the extruder 17 through a pipe 16 connected to the base end in a predetermined amount, and is extruded as a molded product S such as a long sealing material having a uniform cross section through an extrusion molding process.

As described above, in this embodiment, the anti-adhesive agent collecting hopper 2 is provided in the central portion of the separation container 21 in an upward posture.
Since the anti-adhesive separation filter 25 is provided on the upper surface of No. 4 so as to be curved upward, the rubber material A input from the input port 22a above the separation container 21 falls on the anti-adhesion separation filter 25 and the rubber material A Talc powder B applied to the rubber material A
The particles are separated more effectively and collected in the anti-adhesion agent collection hopper 24. Therefore, it is possible to prevent the talc powder B from being mixed in the rubber material A supplied to the extruder 17, and it is possible to mold a high-quality rubber molded product S.

[0027]

As described above, in the rubber material supplying apparatus of the present invention, the anti-adhesive agent separating filter is provided on the upper surface of the anti-adhesive agent collecting hopper which is provided in the upward posture in the central portion of the separation container. Since it is curved, the rubber material charged from the charging port above the separation container falls on the anti-adhesive separation filter, effectively separating the anti-adhesive applied to the rubber material and collecting the anti-adhesive. It is surely collected in the hopper. Therefore, it is possible to prevent the anti-adhesive agent from being mixed in the rubber material supplied to the extruder or the like, and it is possible to mold a high-quality rubber molded product.

[Brief description of drawings]

FIG. 1 is a diagram showing a rubber material supply device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a main part of a conventional rubber material supply device.

[Explanation of symbols]

 11 ... Storage hopper (storage means) 13 ... Vibrating screen (supply path) 14, 16 ... Pipe (supply path) 15 ... Storage hopper (supply path) 17 ... Extruder 18 ... Vacuum pump 20 ... Adhesive separator 21 ... Separation container 22a ... Input port 23 ... Open / close valve 24 ... Anti-adhesion agent collection hopper 25 ... Anti-adhesion agent separation filter A Rubber material B Talc powder

Claims (1)

[Claims] 1. A storage unit for storing a pellet-shaped rubber material coated with a powdery anti-adhesive agent for preventing the rubber materials from sticking to each other on the surface, and a rubber material from the storage unit to an extruder. Is a rubber material supply device provided with an anti-adhesive separator for separating the anti-adhesive agent from the rubber material, which is provided in the middle of a supply path for supplying A separation container into which the rubber material is charged from the charging port, an anti-adhesive agent collection hopper that is installed in an upward posture in the center of the separation container, and a curved upper surface of the anti-adhesion agent collection hopper. The anti-adhesion agent is separated from the rubber material charged through the charging port, the anti-adhesion agent is collected in the anti-adhesion agent collection hopper, and the rubber material after separation of the anti-adhesion agent is dropped downward. And a negative pressure suction means contacting the anti-adhesive agent collection hopper. While being continued, an opening / closing valve is provided in the lower part of the separation container, and in parallel with sucking the anti-adhesion agent in the anti-adhesion agent collection hopper to the negative pressure suction means side, the negative pressure suction means A rubber material supply device, characterized in that the rubber material on the storage means side is sucked to the separation container side by a pressure suction force.