JPH0611490B2 - Twin screw kneader - Google Patents

Description

The present invention relates to a rotor shaft of a kneader for kneading viscous materials such as plastic and rubber.

<Prior Art> A conventional batch-type kneading machine is usually a parallel twin-screw rotor type, and two blades extending from one end to a central portion of the rotor shaft are provided so as to be out of phase with each other. The structure was used a lot.

On the other hand, the present inventor has proposed a twin-screw kneader in which the kneading effect is improved by using one large blade and two small blades, and further, these three blades are provided on a cylindrical body. Proposes a twin-screw kneader having a structure in which a cylindrical body with a blade is fitted and fixed to a straight-screw twin-screw drive shaft (Japanese Patent Application No. 1-92035).

<Problems to be Solved by the Invention> In the kneading step of the material, physical heat generation such as friction, compression, and shearing of the material, and chemical heat generation such as reaction heat occur, and in order to prevent deterioration of the material, Often, the material must be cooled efficiently. Therefore, there is a problem to be solved in which it is desired to pass a heat medium such as cooling water through the tip of the crest of the rotating blade.

Further, when the above-mentioned blade-equipped cylindrical body is used by being fitted to a straight drive shaft, the biaxial kneader can be constructed simply by inserting and fitting the blade-equipped cylinder body in opposite directions to the biaxial drive shaft. Therefore, there is an advantage that the cylindrical body with a blade can be commonly used. However, cooling water, etc. is supplied and collected from the rotary join at the tip of the drive shaft that is not provided with a speed reduction mechanism, so that the passage of the shaft center and the communicating portion of the blade passage should be shared. I can't. The present invention has as its greatest problem to make the heat medium passage formed in the drive shaft common.

<Means for Solving the Problems> In the twin-screw kneader of the present invention, two drive shafts are provided in a container that contains the materials to be kneaded, and one large blade is provided on the drive shafts. In a device in which a cylindrical body having two small blades having different phases is fitted and the heat medium is circulated into each of the blades through the axial center portion of the drive shaft, the inner end of the large blade is connected to An inter-blade heat medium passage is provided along the outer circumference of the cylindrical body at each inner end of the two small blades, and the heat medium passages at the shaft center portion and the heat at two shoulder portions at the outer end of the large blade are provided. A first V-shaped passage connecting the medium passages is provided, and a second V-shaped passage connecting the heat medium passage at the axial center portion and the two heat medium passages at each outer end of the two small blades.
It is characterized by the provision of a character passage.

<Operation> When the rotor shaft rotates in the kneading container filled with the material,
Explaining this only in the axial direction, the material is largely fed from one end over the central part by the large blade, and it is returned small from the other end in two small parts by two small blades with different phases. Be done. In the parallel biaxial type, the other rotor shaft is arranged in point symmetry with the center of the container as the symmetry point, so the material is made from the other end to the central part from the large blade of the rotor shaft. It is returned over a large distance, and is fed in two small pieces from one end toward the center by two small blades having different phases. Further, explaining a certain fixed position in the container, the material is a small blade of one rotor shaft, a large blade of the other rotor shaft,
At the contact point of both rotors, which is pressed by the other small blade of one rotor shaft, but the crests of the blades of one rotor shaft are hard to get into the valleys between the blades of the other rotor shaft, this kind of penetration is 6 during one rotation of the shaft
Is done once. As a result, the material is forced to move in a large and fast manner as compared with the conventional one, and moreover, the kneading with high efficiency proceeds due to the strong compressive force and shearing force.

On the other hand, a heat medium such as cooling water is diverted from the outward path of the axial center part to the first (or second) V-shaped passage, passes through the large blade (or two small blades), and the inter-blade heat is generated. It moves through the medium passage into two small blades (or large blades) and finally through the second (or first) V-shaped passage to return to the return path of the shaft center. In this case, even if the directions of the two bladed cylinders are opposite to each other, since the axial frictional positions of the first or second V-shaped passages are the same, the two drive shafts are engraved. It is possible to share the forward path, the return path, and the V-shaped path of the shaft center portion.

<Embodiment> FIG. 1 shows a plan view of an embodiment of the present invention, and FIG.
A BCD sectional view is shown.

The parallel biaxial rotor shafts 5A and 5B penetrate through the two side walls 2A and 2B facing each other of the container 1 containing the material, and each rotor shaft 5
A and 5B are supported by bearings 3A and 3B and 4A and 4B outside the container, and a transmission mechanism and a motor (not shown) are provided at one end of the rotor shaft to be rotationally driven in the directions of arrows. At the tips of the rotor shafts 5A, 5B, rotor joints 6A, 6
B is provided, and cooling water is transferred to and from the water cooling water passages 7A and 7B at the axial center.

The rotor shaft 5 (5A, 5B) has a constant diameter while penetrating the container 1, has at least no intermediate protrusion, and the cylindrical body 10 with a blade is fitted to the outer periphery thereof. . The bladed cylinder 10 is extended to the outside of the container side wall, and both ends thereof are fixed to the rotor shaft 5 by a fixing means such as a tightening ring or an adhesive.

The bladed cylindrical body 10 is composed of both cylindrical end portions 10A and 10B which fit on the shaft 5 and extend to the outside of the outer wall of the container, and a central portion of a length W accommodated in the container. One large blade 12 and two small blades 13,
14 are provided in different phases. The axial length of the root of the large blade 12 is the distance W between the two side walls of the container.
Longer than 1/2, preferably in the range of 3/5 to 4/5, and the axial length of the root portion of the small blades 13 and 14 is shorter than 1/2 of the distance W between the two side walls, It is preferably in the range of 1/5 to 1/2. As shown in the development view in FIG. 4, the ridgeline of each blade is formed in a spiral shape having an advance angle in a direction in which the material is fed to the center by the rotation of the rotor shaft.
The leading blade 13 of the two small blades 13 and 14 is slightly shorter than the following blade 14.
Therefore, the material is largely fed from one end over the central portion by the large blade 12, then returned to a smaller size by the preceding blade 13, and then again returned to a smaller size by the following blade 14.

The surface layer portion 12a of the large blade 12 has a blade shape,
A core 12b is provided with a predetermined distance from the inner surface thereof,
A heat medium passage 12c is formed between them. Similarly, the surface layers 13a and 14a of the two small blades 13 and 14 are
Also has a blade shape, and heat medium passages 13c and 14c are formed between the children 13b and 14b. These heat medium passages 1
Spacers for maintaining a predetermined distance of 2c, 13c, 14c may be provided integrally with the cores 12b, 13b, 14b. Further, instead of the cores 12b, 13b, 14b, a hollow internal partition wall with the cylindrical body 10 may be provided to form the heat medium passage.

FIG. 3 shows a vertical cross-sectional view of one rotor shaft 5 taken along the blade ridgeline.

The center side end of the heat medium passage 12c of the large blade 12 is provided at both shoulders of the blade, and a blade for communicating with the center end of the heat medium passages 13c and 14c of the two small blades 13 and 14 from here. The passages 23, 24 are cylindrical bodies 10.
It is formed in an arc shape along the outer circumference of c. In this way, both ends of the heat medium passage of the blade surface layer portion which are communicated in series and in parallel are formed at the axial center portion of the rotor shaft 5 through the first or second V-shaped passages 25 and 26.・ Collection path 1
It communicates with 8 and 19. That is, the first V-shaped passage 25 communicates with both shoulders at the outer end of the large blade 12,
The V-shaped passage 26 communicates with the inner shoulders of the two small blades 13, 14.

FIG. 5 is a perspective view schematically showing the heat medium passages associated with the two rotor shafts 5A and 5B with the lead angle of the blade ridge line temporarily set to zero. In the first rotor shaft 5A, cooling water is supplied from the heat medium supply passage 18A to the in-blade heat medium passage through the first V-shaped passage 25A, and the second V-shaped passage 2 is formed.
6A, is recovered in the heat medium recovery passageway 19A, and in the second rotor shaft 5B, cooling water is supplied from the heat medium supply passageway 18B to the heat medium passageway in the blade via the second V-shaped passageway 26B. 1 through the V-shaped passage 25B, the heat medium recovery passage 19
Recovered by B. By appropriately selecting the lead angle of the blade and the phase difference between the first and second V-shaped passages, it is possible to make the structure and size of the heat transfer medium passages of the rotor shafts 5A and 5B common, and If there is a slight phase difference between the tip and the shoulder position of the blade, it is possible to connect them by engraving a circumferential groove on the outer periphery of the rotor shaft or the inner surface of the cylindrical body with blades. it can.

In this blade cylinder 10, for example, the outer wall of the blade portion is manufactured by the lost wax method or the casting method, and the inner wall is manufactured by the pressing method, the lost wax method, or the filled casting, and then the blade portion is formed into a cylindrical portion such as a stainless steel pipe. It can be manufactured by welding the inner wall and the outer wall.

<Effects of the Invention> According to the present invention, not only the parallel biaxial rotor can be constructed by merely fitting the cylindrical bodies with blades of the same shape and size in opposite directions to the rotor shaft, but also the first and second Since the two V-shaped passages communicate with either the outer end of the large blade or the outer end of the two small blades, the machining process of the heat transfer passage of the rotor shaft can be made common, and the V-shaped passage can be manufactured. The process is streamlined. Further, the flow rate at the outer end of the large blade and the sum of the flow rates at the outer ends of the two small blades are, of course, equal, so that the heat medium is passed in parallel to both shoulders at the outer ends of the large blade. Thus, when the cross-sectional areas of the first and second V-shaped heat medium passages are formed to be the same, the flow velocities of the respective parts are the same, and the heat medium is circulated smoothly.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is an ABCD cross-sectional view of FIG. 1, and FIG. 3 is a vertical cross-sectional view of one rotor of FIG. 1 cut along the edge line of a blade. 4 is a development view of a blade portion of one rotor shown in FIG. 1, and FIG. 5 is a perspective view schematically showing only the heat medium passage of the embodiment shown in FIG. 1 ... Container 5A, 5B ... Rotor shaft 10 ... Cylinder with blade 12 ... Large blade 13 ... Small blade 14 ... Small blade 23,24 ... Heat transfer medium between blades 25A, 25B ... 1 V-shaped passage 26A, 26B ... second V-shaped passage

Claims (1)

[Claims] 1. A cylindrical body provided with two drive shafts in a container containing a material to be kneaded, and having one large blade and two small blades having mutually different phases on the drive shafts. In which the heat medium is returned to the inside of each of the blades through the shaft center portion of the drive shaft, from the inner end of the large blade to each inner end of the two small blades. An inter-blade heat medium passage is provided along the circumference, and a first V-shaped passage that connects the heat medium passage at the axial center portion and the heat medium passages at two shoulders at the outer end of the large blade is provided. A twin-screw kneader characterized in that a second V-shaped passage that connects the heat medium passage of the shaft center portion and the two heat medium passages at the outer ends of the two small blades is provided.