JPH0647251B2 - Kneading machine - Google Patents

Description

The present invention relates to a kneader for kneading viscous materials such as plastic and rubber, and more particularly to the structure of its rotor.

<Prior Art> One of conventional rotor manufacturing methods is a method of lathing a shaft and then welding a separately manufactured braid to the shaft. According to this method, thermal stress is generated in the shaft due to the heat of welding, and the shaft center of the shaft may be distorted.

<Problems to be Solved by the Invention> In a pressure-type kneading machine for kneading materials under a closed high pressure, in particular, when there is a gap between the shaft and the blade from the kneading chamber to the outside or in the kneading chamber, There is a problem that it must be sealed because it leaks through the gap to the other.

Further, when the shaft and the braid have a divided structure, as the braid material, for example, a material having high corrosion resistance such as ceramic, stainless steel, and engineered plastic is used, and as a means for fixing this to the shaft, a bolt in the kneading chamber, It is not permissible to use components such as screws that may corrode.

For the purpose of solving these problems all at once, the present inventor has, according to Japanese Patent Application No. 62-136193, formed a straight shape having no unevenness while the rotor shaft penetrates through the kneading container, and the straight portion thereof. In addition, an invention has already been proposed in which an outer insert body having a blade portion integrally formed therein is fitted.

The present invention aims to further improve the above-mentioned prior invention.

When the thickness of the outer wall of the blade is reduced, the temperature gradient on the inner and outer surfaces of the outer wall is reduced, and the material to be kneaded is efficiently cooled or heated, but the volume of the space formed between the rotor shafts is increased. , The cross-sectional area of the space of the blade portion is significantly increased compared to the cross-sectional area of the heat medium supply passage formed in the central portion of the rotor shaft, and as a result, the flow velocity of the heat medium sharply decreases and stagnates in the space of the blade portion. The phenomenon occurs.

Therefore, the problem to be solved by the present invention is to easily and inexpensively manufacture a rotor having a structure in which the flow velocity of the heat medium does not decrease on the inner surface of the blade portion.

<Means for Solving the Problems> In the kneading machine of the present invention, the rotor shaft that penetrates the side wall of the container has a straight shape while it penetrates the inside of the container, and the straight part has a cylindrical portion and a blade portion. The outer wall integrally formed with the outer wall is formed by fitting the braid part of the outer wall with an outer wall for kneading the material in the container and an inner wall forming a space between the cylindrical parts. A fluid passage is formed between the inner wall and the inner wall, and the heat medium for cooling or heating flows back into the fluid passage.

<Operation> By dividing the rotor into a straight shaft and an extrapolated body, the workability of the rotor shaft is reduced, and there is no thermal stress due to welding, etc. Therefore, the straightness accuracy of the rotor shaft is improved. By forming the blade portion of the insert into a double structure of an outer wall and an inner wall and forming a fluid passage having a small cross-sectional area between them, the flow velocity of the heat medium passing through the inner surface of the outer wall of the blade is increased and the cooling or heating effect is improved.

<Embodiment> FIG. 1 shows a longitudinal sectional view of an embodiment of the present invention.

A rotor shaft 5 penetrates through two side walls 2A, 2B of the container 1 containing the material, which face each other, and the rotor shaft 5 has bearings 4A, 4B.
Are supported by a motor (not shown) via a transmission mechanism such as a gear and a speed reducer. Sealing devices 3A and 3B for preventing leakage of material are provided at portions where the rotor shaft 5 penetrates the two side walls 2A and 2B, and an upper portion of the container 1 is vertically moved by a hydraulic cylinder to press the material. A displacing pressure lid 6 is provided.

The rotor shaft 5 has a constant diameter at least while penetrating the container 1, has at least no intermediate protrusion, and the outer insert 7 is fitted to the outer periphery thereof. The outer insertion body 7 is extended to the outside of the side wall of the container, and loop-shaped grooves connected in the circumferential direction are preliminarily formed at both ends of the outer insertion body 7, and an adhesive is press-fitted from the injection ports 16A and 16B. Adhesive layer 15
A and 15B are formed.

The outer insertion body 7 is composed of a cylindrical portion that fits on the shaft 5 and extends to the outside of the container side wall, and one or a plurality of blade portions formed in the container side wall. A double structure of an outer wall 10 for kneading and an inner wall 8 having a space 9 between the shafts 5 and having a shape close to the inner surface of the outer wall 10, wherein a heat is generated between the outer wall 10 and the inner wall 8. A fluid passage 12 is formed to recirculate the medium. FIG. 2 shows a cross-sectional view of the central portion of the blade portion, and FIG.
FIG. 5 is a cross-sectional view of a portion (on the center line of the container) where the blade portions of the above overlap each other.

In order to circulate the heat medium in the fluid passage 12, the rotor shaft 5
Heat medium passages 13 and 14 communicating with one end of the rotor shaft are formed in the central part of
Two passages communicating with one end A of the fluid passage 12 of the blade portion and extending from the other end B of the fluid passage 12 of the first blade portion to one end C of the second blade portion along the outer peripheral portion of the shaft 5. Is integrally formed with the blade portion, and the other end D of the second blade portion communicates with the end of the passage 14.

In addition, at a portion of the outer insertion body 7 that faces the inner surface of the container side wall, the flange portions 11, 1 forming a part of the sealing devices 3A, 3B.
1 is integrally formed. A sealing surface is formed by pressing the end surface of the cylindrical packing against a surface perpendicular to the axis of the flange portions 11, 11.

In the outer insert 7 of the present invention, for example, the outer wall of the braid part is manufactured by the lost wax method or the casting method, and the inner wall is manufactured by the pressing method or the lost wax method. It can be manufactured by welding, or the outer wall and the outer wall can be integrally manufactured by the lost wax method with a spacer portion interposed.

It should be noted that the straight portion of the rotor shaft of the present invention is not required to have a convex portion that prevents insertion of the outer insertion body 7, and a shape including a small diameter portion is also a substantially straight portion.

<Effects of the Invention> According to the present invention, since the rotor is divided into parts by fitting the outer insert to the outer circumference of the rotor shaft, mass productivity is improved, and the rotor shaft is common to various blade shapes. It can be used, and the thermal strain due to welding does not occur unlike in the past, so the accuracy of the shaft center is improved. Further, since the cross-sectional area of the fluid passage in the blade is reduced and the flow velocity can be easily increased, the cooling or heating effect of the material to be kneaded is improved.

Therefore, for example, in the kneading step of rubber, conventionally, the temperature of the rubber material becomes high, so that the material was taken out from the kneading machine and cooled and then vulcanized, but if the kneading machine of the present invention is used, the kneading step After that, it became possible to carry out the vulcanization process in the same container, and all processes were dramatically streamlined.

[Brief description of drawings]

 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a lateral sectional view of the central portion of the braid portion in FIG. 1, and FIG. 3 is a lateral sectional view on the center line of the container in FIG. 1 ... Container 2A, 2B ... Container side wall 3A, 3B ... Sealing device 4A, 4B ... Bearing 5 ... Rotor shaft 6 ... Pressurizing lid 7 ... Outer insert 8 ... Blade inner wall 9 ...... Space 10 ...... Blade outer wall 12 ...... Blade fluid passage 13, 14 ...... Rotor shaft heat medium passage

Claims (2)

[Claims] 1. A device in which a rotor shaft penetrates through two side walls of a container containing a material to be kneaded, which are opposed to each other, and a blade for kneading the material is formed in a portion of the rotor shaft in the container. The rotor shaft has a straight shape while penetrating the inside of the container, and an outer insert body in which a cylindrical portion and a blade portion are integrally formed is fitted to the straight portion, and the blade portion of the outer insert body is attached to the container. An outer wall for kneading the materials in the inner wall and an inner wall forming a space between the cylindrical portions to form a fluid passage between the outer wall and the inner wall, and heat for cooling or heating in the fluid passage. A kneader characterized in that the medium is configured to reflux. 2. The kneading machine according to claim 1, wherein the braid portion of the outer insert is formed by the lost wax method.