JPH04132923U - extruder - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the hardness or thickness of the material changes, a stable amount of material penetration can be ensured without having to modify the supply port. [Structure] In an extruder in which a screw 2 is rotatably arranged in a cylinder 1 and a material supply port 3 is formed on the peripheral wall of the proximal end of the cylinder, the cylinder 1 is connected to the inner end of the supply port 3. An annular recess 5 is formed on the inner peripheral surface over a range of 360 degrees.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to extruders used to extrude rubber and synthetic resin materials. It is something to do.

0002

[Conventional technology]

In this type of extruder, as shown in FIGS. 4 and 5, there is a A screw 12 is rotatably arranged, and a material supply port is provided on the peripheral wall of the proximal end of the cylinder 11. 13 is formed, and a discharge port 14 is formed at the tip of the cylinder 11. . Further, the supply port 13 has a wedge shape that becomes narrower toward the outer peripheral surface of the screw. For example, when extruding a rubber material, a motor (not shown) is used to extrude the rubber material. By rotating the screw 12, a solid tape-like material is poured into the cylinder 11 from the supply port 13. is continuously supplied, and the material is sheared and plasticized by the rotation of the screw 12. is transferred to the distal end side along the axis of the cylinder 11, and is transferred to the discharge port 14. It is extruded and discharged from

0003

[Problem that the idea aims to solve]

However, when the hardness or thickness of the material changes, the screw 12 for the material changes. A change occurs in the amount of biting. Then, when the amount of material biting becomes large, In this case, the material bitten into the cylinder 11 flows back into the supply port 13 and A large amount of banks are accumulated, and the banks are again pushed into the cylinder by the screw 12. 11, and the amount of discharge from the discharge port 14 becomes unstable. Also, the material When the amount of material biting into the material becomes small, the amount of material discharged from the discharge port 14 decreases. As a result, the amount of material discharged becomes unstable. In this case, in a conventional extruder, Since the supply port 13 is simply wedge-shaped, the Therefore, it is necessary to adjust the depth, width, etc. of the supply port 13. Specifically, the supply port Modify the shape of cylinder 13 or replace it with a cylinder 11 that has a supply port 13 of a different shape. The problem was that it was very complicated.

0004 This idea was created by focusing on the problems that exist in conventional technology. The purpose of this is to maintain the service life even if the hardness or thickness of the material changes. There is no need to modify the shape of the inlet or replace the cylinder, ensuring stable extrusion function at all times. The objective is to provide an extruder that can

[0005]

[Means to solve the problem]

In order to achieve the above purpose, in this invention, the supply port is provided on the inner peripheral surface of the cylinder. It forms an annular recess that is continuous with the inner end of the screw and surrounds almost the entire circumference of the screw. It was completed.

[0006]

[Effect]

In the extruder configured as above, when the screw is rotated, the supply port Material is supplied into the cylinder from the It is transferred to the distal end side along the axial direction and is pushed out and discharged from the discharge port. At this time , a continuous annular recess is formed at the inner end of the supply port, so that the supply from the supply port is A certain amount of the material collected in the annular recess is released from the part that contacts the screw. It is bitten into the tip side of the cylinder in turn.

[0007] Therefore, for materials with a large amount of penetration, the material accumulated in the annular recess will Next, it comes into contact with the inner circumferential surface of the supplied material, and the friction prevents it from digging in. It acts as a barrier and prevents the material from digging into the material. Also, materials with a small amount of penetration For this, the material accumulated in the annular recess is sequentially removed from the inside by the rotation of the screw. It is scraped off to stabilize the amount of penetration. Therefore, the hardness and thickness of the material change. Even if the The amount of penetration of the material can be ensured.

[0008]

【Example】

An example of an extruder embodying this idea will be explained below based on Figs. 1, 2, and 3. This will be explained in detail. Now, in the extruder of this example, the screw 2 is rotatable inside the cylinder 1. A material supply port 3 is formed in the peripheral wall of the proximal end of the cylinder 1. A discharge port 4 is formed at the tip of the cylinder 1. Also, the supply port 3 is a screw It is formed into a wedge shape toward the lower part of the outer periphery of 2. As shown in Figures 1 and 2, It is continuous with the inner end of the supply port 3 of the screw 2 and surrounds the circumferential surface of the screw 2. An annular recess 5 is formed on the inner peripheral surface of the cylinder 1 over 360 degrees.

[0009] As shown in FIG. 2, the depth L1 of the annular recess 5 is equal to 3 The width L2 of the concave portion 5 is set to 100% to 10% of the outer diameter D of the screw 2. It is set to 50%. Next, the operation of the extruder configured as described above will be explained. Now, in this extruder, screw 2 is rotated by a motor (not shown). In this state, a tape-shaped rubber material is supplied into the cylinder 1 from the supply port 3. , the material is sheared and plasticized by the rotation of the screw 2, and the material is The liquid is transferred to the distal end side along the axis of 1, and is pushed out and discharged from the discharge port 4. Konoto Since the annular recess 5 is formed continuously at the inner end of the supply port 3, the supply port 3 The material supplied from the screw is always kept uniformly in the annular recess 5 so as to be wound around the outer circumference of the screw 2. A fixed amount accumulates, and in that state, it is bitten in order from the inner circumference side that contacts screw 2. Ru.

0010 Therefore, if the material has a large amount of biting, it will accumulate in the annular recess 5 and cause The material wrapped around the outer circumference of Nue 2 is then fed, and the material wrapped around the outer circumference is further fed to the inner circumference of the outer circumference. Friction with the surface acts as a brake against digging in, preventing the material from digging in. suppressed. In addition, for materials with small biting, the material accumulated in the annular recess 5 The screw is further pushed inward by the material being fed outward. Rotation 2 sequentially scrapes away from the inside, stabilizing the amount of bite. In other words, Even if the material has small biting, it cannot contact the screw 2 for a long time inside the annular recess 5. The required biting amount can be secured. Therefore, the hardness and thickness of the material will change. Even if the feed port 3 is There is no need to modify the shape such as depth or replace the cylinder 1 with a cylinder 1 that has a different shape of the supply port 3. A stable amount of material penetration can be ensured at all times. Therefore, it is always cheap. A fixed discharge amount can be obtained.

[0011] Note that this invention is not limited to the configuration of the embodiment described above, and for example, A supply roller is provided corresponding to port 3, and this supply roller supplies the material from the supply port. The configuration of each part may be changed as long as it does not deviate from the spirit of this invention. It is also possible to change and embody it as desired.

0012

[Effect of the idea]

Since this device is constructed as explained above, the hardness and thickness of the material can be changed. There is no need to modify the shape of the supply port or replace the cylinder even if the This has the excellent effect of ensuring a stable supply of materials.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of an extruder embodying this invention.

FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1;

FIG. 3 is a partial cross-sectional view showing the entire screw portion of the extruder.

FIG. 4 is a sectional view taken along line CC in FIG. 5;

FIG. 5 is a cross-sectional view of a conventional extruder.

[Explanation of symbols]

1 cylinder, 2 screw, 3 supply port, 4
Discharge port, 5 annular recess.

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Shohei Mizuno 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Address Inside Toyoda Gosei Co., Ltd. (72) Creator Seiji Murakawa 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Address Inside Toyoda Gosei Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A screw is rotatably disposed within a cylinder, and a material supply port is provided on the peripheral wall of the proximal end of the cylinder, and the supply port is formed in a wedge shape that becomes narrower toward the outer peripheral surface of the screw. , in an extruder having a discharge port at the tip of the cylinder, an annular recess is formed on the inner circumferential surface of the cylinder that is continuous with the inner end of the supply port and surrounds almost the entire circumference of the screw; An extruder featuring: