JPH02269010A - Rotor of kneading machine - Google Patents

Abstract

PURPOSE:To contrive an improvement in kneading effect, by arranging one overside blade and two undersize blades on one rotor shaft by making their phases different from each other. CONSTITUTION:One oversize blade 2 and two undersize blades 3, 4 are provided on the central part of a straight cylindrical body 1, which is fitted over and stuck close to a rotor shaft, under phases different from each other. Surface layer parts 2a-4a of the blades 2-4 each are formed in a platelike state, on the inside of which are provided with internal partition walls 2b-4b and heating medium passage 2c-4c are formed among them. With this construction, efficient kneading is advanced and efficient cooling or heating can be performed by making use of a small quantity of a heating medium.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotor shaft for a kneading machine for kneading viscous materials such as plastics and rubber.

<Prior Art> Conventional batch-type kneading machines are usually of the type with two parallel rotors, and the rotor shaft has a structure in which two blades extending from one end to the center are provided with a phase shift from each other. were frequently used.

On the other hand, as disclosed in Japanese Unexamined Patent Publication No. 63-297003, the present inventor did not provide blades directly to the rotor shaft, but fitted a bladed cylindrical body equipped with blades to a straight shaft. However, a rotor shaft for a kneading machine is proposed in which both ends of the bladed cylindrical body are extended to the outside of the side wall of the container, and an outer member is fixed to the shaft outside the container.

<Problems to be solved by the invention> The first problem is to improve the kneading effect. In conventional rotors, each blade feeds the material into the center, so areas with high kneading efficiency tend to concentrate in the center of the container. To deal with this, it is possible to provide a large blade that extends beyond the center from one end and a small blade that does not reach the center from the other end, but the torque generated in both blades will be unbalanced and a large thrust will be applied to the shaft. A new problem arises:

The second problem is to efficiently cool or heat the material to be crossed. When a coolant circulation path is provided inside the rotor shaft, it is usually provided along the central axis of the shaft.
It is the leading edge of the blade that requires the most cooling during the crosstalk process and is furthest from the center of the shaft. Regardless of the method used to form the blade, the shape of the blade is by no means simple, and since the rotor is rotating, it is not easy to efficiently cool or heat the tip of the blade.

If the first problem is solved and the kneading effect is improved, especially in a pressurized kneader where the inside of the container is pressurized by the upper lid,
Efficient cooling or heating of materials becomes increasingly important as they generate physical frictional heat and chemical heat of reaction, and some applications may require high-temperature kneading.

The present invention provides a kneading machine rotor that has a structure that solves the above-mentioned problems at once, and that is used by being fitted and fixed to a straight rotor shaft.

<Means for Solving the Problems> The kneading machine rotor of the present invention has one large blade and two small blades integrally formed in the center of a cylindrical body that fits into the rotor shaft, and has the above-mentioned features. The outer end of the large blade is located at one end of the central portion, and the outer end of the small blade is located at the other end of the central portion, and the inner end of the large blade and the two A space is provided between each inner end of the small blade to allow material to pass therethrough.

Function> The rotor shaft of the present invention is used by being fitted and fixed to a straight rotor shaft 20, as shown in FIG.

When used as the rotor of a parallel twin-shaft kneader, the rotor should be oriented symmetrically about the center of the kneading vessel so that the large blades on one rotor shaft engage the small blades on the other rotor shaft. Used by fitting and fixing.

When the rotor shaft rotates in a kneading container filled with materials, the material is sent from one end over the center by a large blade, to explain only the axial direction.
It is returned to the center from the other end in two small pieces using two small blades with different phases. In the parallel two-wheel type, the two rotor shafts are arranged symmetrically with respect to the center of the container, so the material is transported from the other end over the center by the large blades of the two rotor shafts. It is sent back in a large way from one end toward the center by two small blades with different phases, and sent in two small portions. Also, to describe a fixed position in the container, the material is subjected to a pressing force by a small blade on one rotor shaft, a large blade on the other rotor shaft, another small blade on one rotor shaft, At the contact point between the two rotors, where the ridges of the blades of one rotor shaft are inserted into the valleys between the blades of the other rotor shaft, such insertion occurs six times during one rotation of the rotor shaft. As a result, the material is forced to move much faster than in the past, and during this time it is subjected to strong compressive force and shearing force, resulting in efficient kneading.

On the other hand, the heating medium for cooling or heating is recovered from the supply path at the center of the rotor shaft through the surface layer of the three blades and back to the recovery path at the center of the rotor shaft. Since the inner wall surface for forming the heat medium passage is provided inside, it is possible to keep the cross-sectional area of the heat medium passage small, and the heat medium supplied from the shaft center is transferred to the blade. Since it becomes easy to pass through the vicinity of the surface layer at high speed, efficient cooling or heating can be performed using a small amount of heat medium.

<Example> Fig. 1 shows a front view of an embodiment of the present invention, Fig. 2 shows a side view of Fig. 1, and Figs. A sectional view, BB sectional view, and C-
A cross-sectional view of C is shown.

One large blade 2 and two small blades 3.4 are installed in the center of a straight cylindrical body 1 that is fitted and fixed to the rotor shaft.
As shown in FIG. 2 or 3(b), they are provided in mutually different phases. The axial length of the root portion of the large blade 2 is longer than the length W of the central portion, preferably 3
15 to 415, and the axial length of the root trunk of the small blades 3 and 4 is less than 1/2 of W, preferably in the range 115 to 1/2. The ridgeline of each blade 2.3.4 is formed in a spiral shape with an advance angle in the direction of feeding the material toward the center by rotation of the rotor shaft, as shown in the exploded view in FIG. Further, among the twelve small blades 3 and 4, the leading blade 3 is slightly shorter than the following blade 4. Therefore, the material is large blade 2
After being sent from one end to a large distance beyond the center, it is returned to a small size by the preceding blade 3, and then returned to a small size again by the following blade 4.

The surface portions 2a, 3a, 4a of each blade 2.3.4 are plate-shaped, and internal partition walls 2b, 3b, 4b are provided at a predetermined distance on the inner surface of the plate, and a heat medium passage 2c,
3c and 4c are formed.

A spacer may be provided integrally with the internal partition wall to maintain a predetermined distance between these heat medium passages 2C, 3c, and 4c.
Further, the space between the internal partition walls 2b, 3b, 4b and the cylindrical body 1 may be hollow as shown in the figure, or may be a solid member filled with space.

The central end 5 of the heat medium passage 2C of the large blade 2 is located at the third
As shown in the figure (bl), it is provided on both shoulders of the blade,
From here, an arc-shaped passage 23.2 is formed along the outer circumference of the cylindrical body 1.
4 is formed, and this passage communicates with the central ends 6 and 7 of the heating medium passages 3c, 4c of the two small blades 3,4. Further, a port 12 is formed on the cylindrical body 1 corresponding to the terminal position of the heat medium passage 2C of the large blade, and a port 12 is formed on the cylindrical body 1 corresponding to the terminal position of the heat medium passage 3c, 4c of the two small blades. 13.14 are formed. Incidentally, circumferential protrusions 8.9 are integrally formed at both ends of the central portion of the cylindrical body 1, and constitute a part of the sealing device in the container side wall through hole when the rotor shaft is installed in the kneading container. ing.

In the rotor of the present invention, for example, the outer wall of the blade part is manufactured by a lost wax method or a casting method, the inner wall is manufactured by a pressing method or a lost wax material or a solid casting, and then the cylindrical part of the blade part is made of a stainless steel pipe or the like. It can be manufactured by welding the inner and outer walls.

The blade of the present invention can be implemented in various shapes, and for example, the length of the blade ridgeline can be formed to be very short compared to the length of the blade root body. Therefore, even though the length of the ridge line of the small blade is shorter than 1/2 of the distance W between the container walls, the length of the root part thereof may be longer than 2 in some cases. Similarly, the length of the ridgeline of the large blade may be equal to -72 or slightly smaller than +172. In short, it is sufficient if there is a relative size relationship between the large blade and the small blade. However, a preferred size relationship is when the sum of the lengths of the two small blades is approximately equal to the length of the large blade.

When using the product of the present invention, as shown in FIG. 6, both ends IA of the cylindrical body 1 are fitted onto the rotor shaft 10.

The IB is fixed to the rotor shaft 10. When this rotor shaft 10 is mounted on the kneading vessel, the two ends I A, I B extend outside the side walls 15, 16 of the kneading vessel. This rotor shaft has a heating medium supply/recovery passage 17.1 in the shaft center in advance.
8 is formed and communicates with ports 12, 13, and 14.

<Effects of the Invention> According to the present invention, one large blade and two small blades are arranged on one rotor shaft with different phases from each other. When configuring a parallel two-wheel type kneading machine, the material in the kneading container is fed thickly in the axial direction and then returned, as explained in the operation section, and is subjected to a strong compressive force up to 6 times during one rotation of the rotor shaft. Kneading is performed with high efficiency by receiving shearing force and shearing force. In addition, since the thrust generated by the large blade and the thrust generated by the two small blades cancel each other out, the thrust generated on the rotor shaft is reduced, which not only simplifies the bearing structure, but also reduces machine friction and extends the service life. become longer. Furthermore, since the heat medium passes near the surface layer of each blade, the cooling/heating efficiency is high (therefore, the amount of heat medium used is small), and the volume of the heat medium circulation device is also small.

Furthermore, according to the present invention, a parallel twin-rotor type kneading machine can be manufactured by simply fitting and fixing the present invention products having the same shape and dimensions onto two rotor shafts in opposite directions, and this allows for mass production. Improves sex. Furthermore, conventionally, small-sized kneading machines used two blades and large-sized kneading machines used four blades, but according to the present invention, it can be applied to a wide range of applications from small to large. I can do it.

[Brief explanation of drawings]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a side view thereof, Figs. FIG. 4 is a developed view of the embodiment of the present invention; FIG. 5 is a vertical sectional view along the blade ridge line of the embodiment of the present invention; FIG. 6 is an explanatory diagram of the usage state of the embodiment of the present invention. be. 1 ・ 2 ・ 3 ・ 4 ・ 23, 24 ・ 12, 13. 14 - Cylindrical body, large blade, small blade, small blade, heat medium passage, port

Claims (4)

[Claims] (1) One large blade and two small blades are integrally formed in the center of the cylindrical body that fits with the rotor shaft, and the outer end of the large blade is one end of the center part. , and the outer end of the small blade is located at the other end of the central portion, and the inner end of the large blade and the second
A kneading machine rotor characterized in that a space is provided between each inner end of the small blades to allow material to pass therethrough. (2) The kneader rotor according to item 1, wherein the twisting direction of the large blade and the twisting direction of the small blade are opposite to each other. (3) Two passages for passing a heat medium are formed between the inner end of the large blade on the outer periphery of the cylindrical body and the inner end of the two small blades, and the cylindrical body 3. The kneading machine rotor according to claim 1 or 2, wherein a port for passing a heating medium is bored at each of the outer end position of the large blade and the outer end position of the two small blades. (4) The length of the root part of the large blade is longer than 1/2 of the axial length of the central part, and the length of the root part of the small blade is 1/2 of the axial length of the central part. The kneading machine rotor according to item 1, item 2, or item 3, wherein the kneader rotor is shorter than /2.