JPS63306006A - Hermetically closed type kneader - Google Patents

Abstract

PURPOSE:To eliminate unstable operability, to enhance productivity and to perform stable high quality kneading between batches, by arranging a plurality of pins to the body part of a rotor blade over 1/2 or more the length of a rotor in the axial direction. CONSTITUTION:A pair of left and right meshing rotors 1, 2 are parallelly arranged so as to be made revolvable in mutually reverse directions and a plurality of pins 22 are arranged to the body part of a rotor blade over 1/2 or more the length of each of rotors 1, 2 in the axial direction. By this structure, the charged material 20 present at the outlet of a hopper 13 is extruded toward the rotor 2 as shown by an arrow 23 by the rotation of the rotor 1. The extruding of the material 2 by the rotor 1 becomes in the direction on the side of a door part 15 from the direction of the line 10 connecting the axis 0 of the rotor 2 and the tip of the rotor 1 as shown by an arrow 24. By this constitution, the action for strongly drawing in the material 20 toward the door part is generated in cooperation with the movement of the pins 22 on the side of the rotor 2 and the biting property of the charged material is enhanced certainly by said action.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is known to be used mainly for mixing plastic materials such as rubber and plastics, and particularly relates to a rotor meshing type closed kneading machine. be.

(Prior Art) A closed-type kneader is a batch-type kneader suitable for kneading plastic materials such as rubber and plastic, and is particularly indispensable mechanical equipment in the rubber industry field such as tire manufacturing. What is desired for this type of kneading machine is, as is known, high dispersion of additives to the main material, high homogeneity of kneading, the ability to input a large amount per batch, and high productivity resulting from short time mixing. Examples include stable operation and operability for each batch. Furthermore, in a closed-type kneading machine, the necessary materials are usually fed in a fixed amount at once through a hopper opening provided on the upper side of a mixing chamber surrounded by a casing and an end frame. The mixture is introduced into the kneading chamber by the drawing force (injection capacity) into the chamber chamber by a pair of winged rotors rotatably arranged in parallel in the hopper, and the pushing pressure of a ram disposed on the hopper side. Once the ram has finished pushing all of the materials into the mixing chamber, uniform kneading of the entire material begins via the pair of rotors that rotate in opposite directions. Therefore, completing the material input early and stably is one of the important moments that leads to shortening of crosstalk time, improvement of mixing performance, and stable operation operability.

On the other hand, closed-type kneaders can be roughly divided into two types based on their mechanisms: non-intermeshing kneaders (tangential type) and intermeshing-type kneaders.
I will now explain the outline of this drawing. The one illustrated in Fig. 12 is a non-intermeshing type kneader, and the figure shows the main parts transverse in the axial direction, but the casing 1) and the casing (not shown) and the cross-sectional part in the vertical direction in the figure are shown. A kneading chamber 12 is formed inside the casing, both ends of which are sealed by end frames, and a pair of kneading rotors 1 and 2 are disposed in the chamber 12 in a non-meshing state and in opposite directions as indicated by arrows. A communicating portion 16 is formed as a gap between both rotors 1 and 2 in the vertical direction in the figure, and the center of the chamber 12 corresponding to this communicating portion 16 At the top and bottom, a hopper 13 for supplying material is provided with a ram 14 for pushing material, and a door section 15 is provided for discharging mixed material. As shown in the figure, the known long rotor blades 17 and short blades 18 are formed spirally around the rotor axis, and the long blades 17 and short blades 18 are oriented in opposite directions. The kneading machine is the first
As illustrated in FIG. 3 and as the rotor plane is shown in FIG. 17, a pair of kneading rotors 1 and 2 are arranged side by side in a meshing state, and in order to prevent the rotor blades from contacting each other, As shown in the figure, both rotors 1 and 2 are different in that their phases are shifted by 90 degrees, but are otherwise similar.

Among these two types of mixing machines, the non-intermeshing mixer allows a large amount of material to be input per batch, has excellent injection capacity, has stable operability, and is excellent in high productivity. On the other hand, it is known that the other intermeshing type kneader is known to be characterized by its high ability to disperse and homogenize additives.

(Problems to be Solved by the Invention) Although the above-mentioned intermeshing type kneading machine has an excellent reputation for its kneading function, it is generally difficult to input a large amount per batch with this type of kneading machine. , Due to the poor injection performance of official materials, there are problems in terms of operability and productivity, and the unstable injection performance leads to increased quality variation between batches, making it difficult to manage production. Another problem is that it is difficult to do so. Therefore, the inventor conducted a comparative study on the injection performance of official materials in the non-intermeshing type kneader and the intermeshing type kneader shown above using two experimental devices, and found that the intermeshing amount has a It was discovered that there was a problem with the loading performance. The two experimental apparatuses mentioned above are as follows. In other words, one experimental device was a model kneader with a chamber inner diameter of approximately 200fi and an axial length shortened to 1 that of a corresponding mixer. It can be observed from the window, and the other one
The two experimental devices had a chamber inner diameter of approximately 1001 mm, and the axial length was the same as that of the corresponding mixer, except that the rotor was made of laminated thin iron plates, allowing various blade devices to be configured. This is a model crosstalk machine, and the chamber is made of transparent resin, making it possible to observe the movement of materials inside.

According to the results of repeated experiments, in the non-meshing type shown in FIG.
Since the space of the communication portion 16 in the rotor 2 is wide, material can easily enter the chamber 12, and the pair of rotors 1 and 2 have a large space.
There is a rotation ratio of about 1 to 1.2, and as shown in Fig. 14, the periodic phase of the tips of the left and right rotors 1 and 2 is 0° (synchronization).
At this time, the action of pulling the material from the hopper 13 side is strong (as shown by the arrow 19 in the figure) by both rotors 1 and 2, and as shown in FIG. Although the phase is 90° (phase shift), material movement occurs extremely smoothly and actively within the wide communication section 16, and does not cause any problem in injection performance.

On the other hand, in the meshing type, the distance between the shafts of the left and right rotors 1 and 2 is relatively short compared to the non-meshing type (because the space in the communication part 16 in the center of the chamber is narrow, As can be seen in the figure, official material enters the chamber (
As is known, the left and right rotors 1 and 2 rotate at the same speed, and the left and right rotors 1 and 2 rotate at the same speed.
, 20 are out of phase by almost 90 degrees, and their rotary blades are also twisted in the axial direction as shown in FIG. Since the space from the opening to the lower door portion 15 is never completely opened at once, the tendency for material to enter the chamber is further exacerbated. In particular, since the blade phases of the left and right rotors 1 and 2 are shifted by 90 degrees, one rotor 1 or 2 tries to push the official material 2 degrees toward the other rotor 2 or 1, as shown in Fig. 18. When the other rotor 2 or 1
The material 20 moves to repel this, and as shown by the arrow 21, the material 20 is placed below the hopper 13 and just reciprocates between the left and right rotors 1 and 2 like a catch ball. A problem arises in that the strong pulling action of the material due to the synchronization of the left and right pair as seen does not occur at all.

(Means for Solving the Problems) The present invention solves the problems in the above-mentioned intermeshing type closed kneading machine, and by improving its injection performance (ability), it is possible to complete feeding in a short time. This not only stabilizes operability and improves productivity, but also enables stable kneading production. Specifically, a pair of In a device in which meshing rotors are arranged side by side so as to be rotatable in opposite directions, a plurality of pins are disposed in the rotor wing body over two or more of the axial lengths of the rotors.

(Function) According to the above-mentioned technical means of the present invention, as illustrated in FIGS. In the kneading chamber 12 configured, a pair of left and right meshing rotors 1 and 2 as illustrated in FIG. 17 are arranged in parallel so as to be rotatable in opposite directions. By arranging a plurality of pins 22 in the rotor wing body over three or more of the axial lengths of , 2,
As shown in FIG. 1, the material 20 at the outlet of the hopper 13 is pushed out toward the rotor 2 as shown by the arrow 23 due to the rotation of the rotor 1. The pin 22 is supported by a pin 22 provided on the front surface 8, and as shown in the figure, the pin 22 is at an angle of β (≦90°) with the tip 6 of the rotor 2, so as the rotor 2 rotates, This supporting material 20
As the rotation progresses further, the material 20 is pushed out in the direction shown in FIG.
Door part 15 from the direction of line 10 connecting chip 3 in
As shown by the arrow 24, pin 2 on the rotor 2 side
Coupled with the movement of the material 20, the material 20 is strongly drawn toward the door portion 15, thereby reliably improving the injectability of the material. Furthermore, this rotor 1,
Since the movement No. 2 is carried out in the same manner alternately between the left and right rotors, it is possible to easily improve the injection performance in the meshing type. 1st
．． In Figure 2, 8 indicates the front surface of the rotor blade, and 9 indicates the back surface of the rotor blade. FIG. 3 shows a model kneading machine in which various arrangement examples of the pins 22 according to the present invention are set, and the chamber inner diameter is about 2001 m, and the axial length is shortened to the equivalent mixer umbrella, among the experimental apparatus described above. It is a graph showing a comparison of injection performance in an experiment using the 2000, in which the vertical axis shows the ram descending time from the start of material input until the pushing ram 14 reaches the lowest limit, and a shown on the horizontal axis shows the injection performance with the pin 22. Hereinafter, b-g show an example of a rotor using the pin 22 according to the present invention, and in b-g, β indicates the angle value of the pin 22 with respect to the rotor chip 6 shown in FIG.
Also, k indicates the height of the pin 22, and in this case, the same height k is the ratio of the distance r from the rotor axis O to the body diameter R = -3
It is displayed as . a, indicates the ram lowering time due to a,
b, ~g+ indicate each ram lowering time according to b-g, and in the experimental example, three pins 22 were installed in parallel in the axial direction. In other words, the shorter the ram descent time, the better the injection performance, and as shown in the figure, the installation of the pin 22 of the present invention has improved the injection performance compared to the conventional rotor. It is clear that the arrangement angle β of the pin 22 is 0°≦β<60°, and the height of the pin 22 is expressed as the distance r from the rotor axis, where r is the rotor body diameter R.
It has been confirmed that there is an effect of improving the injection property by making the amount 1.15 times or more of
pins are provided on the back face of the rotor blade, f to g are pins provided on the front face of the rotor blade, and the pin 22 is placed on either the front side or the bank side of the rotor blade. It is confirmed that it is effective even when placed in .

(Example) A suitable example of the present invention will be sequentially explained with reference to FIGS. 4 to 1).

The embodiment shown in FIGS. 4 and 5 shows a developed view of the rotor in the embodiment illustrated in FIG. 1.2.
Figure 4 shows only one of the left and right rotors 1, 2, but in the figure, 3.4 both indicate the rotor tips of the long blades 17, 17 shown in Figure 17. In the same embodiment, three pins 22 are arranged side by side on the back face 9 of the rotor blade in the center of the rotor 1 at the same angle as the torsion angle α of the long blade 17 and spaced apart in the opposite direction. FIG. 5 shows the relative relationship with the pin arrangement in the other rotor 2. As is clear from the figure, the pins 22 overlap each other in parallel with the long blades 17 of the other rotor. (The overlap between the lengths M17 is usually about 2 of the total rotor length). The solid line pin 22 is on the rotor 1 side, and the dotted line pin 22 is on the rotor 2 side. Further, in this case, the pin 22 is positioned directly under the outlet of the hopper 13 shown in FIG.
By disposing the rotor in the center of the rotor 2 and synchronizing with the other rotor within the overlapping range, it is possible to obtain the effect of improving the injection performance as previously illustrated in FIG.

In the embodiment shown in FIG. 4, A indicates the direction of rotation of the rotor, and B indicates the direction of movement of the material on the rotor.

The embodiment shown in FIG. 6 is an example of a rotor in which a large number of pins 22 are arranged in the same way from a rotor blade back face 9 to a rotor blade front face 8. However, it can be expected that the injection performance will be improved by adding more pins 22, but the arrangement of many pins
This will impede the flow of material moving axially along 7. The axial flow of the material after the material injection is completed is
Since the pins 22 play an important role in mixing the entire crosstalk material, it is necessary in the design to arrange the pins 22 at positions that do not impede the axial flow of the material, and to consider wide mutual spacing between the multiple pins 22. be. Originally, the amount of material input into this type of closed kneading machine was usually 0.5 to 0.8 as a space filling factor.
The kneaded material after injection is completed is filled as shown in FIG. 7 as a kneaded material 23d, and there is some space 24a on the rotor blade back surface 9 side. Therefore, the arrangement of the pins 22 in the present invention is such that the back surface 9
It is preferable to dispose the material in a manner that it does not come into contact with the material and does not impede the flow of the material. When disposed on the rotor blade front surface 8, the distance between the pins 22 and 22 should be at least twice the major axis E of the pins 22, as illustrated in FIG. 4, to minimize resistance to material flow. It is desirable to suppress it. In addition, in this regard, as in the embodiment shown in FIG. 8 and the embodiment shown in FIG. This also makes it possible to suppress obstruction of material flow.

Also, as in the embodiment shown in FIG.
As in the embodiment shown in the figure, by arranging a plurality of pins 22 in double rows or spread out or dispersed at intervals instead of in a single row, injection performance can be improved without impeding material flow. However, from an overall perspective, the pin 22 obstructs the material flow over a range of the rotor's axial length, centering on the center of the rotor where it can effectively contribute to injection performance. By arranging this arrangement in such a way that the injection performance is improved, it is possible to reliably improve the injection performance, which is the objective of the present invention.

(Effects of the Invention) According to the present invention, it is possible to improve the problem of poor injection performance of official materials in closed-type kneading machines, especially rotor meshing type closed-type kneading machines. It can give injection performance comparable to that of other machines, and it is difficult to do large amounts of injection.
It has excellent characteristics as it solves problems such as unstable operation and low productivity, and enables stable, high-quality kneading between each batch.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of the main part of an embodiment of the present invention, Fig. 2 is a front view of the same showing the movement state, Fig. 3 is a graph showing the relationship between the pin arrangement and the ram lowering time according to the invention, and Fig. 4 is a Fig. 1 is a developed plan view of one rotor in the embodiment, Fig. 5 is a plan view showing the pin arrangement relationship of both rotors, Fig. 6 is a plan view of the modified embodiment, and Fig. 7 is a plan view of the kneading machine. 8 to 1) are developed plan views of each example of the same bin arrangement, and Figures 12 and 13 are cross-sectional front views of the main parts of conventional rotor non-meshing type and meshing type kneading machines for each part. , Figures 14 and 15 are explanatory diagrams of material injection states in a non-meshing type kneading machine, Fig. 16 is a plan view of a non-meshing type rotor, Fig. 17 is a plan view of a meshing type rotor, and Fig. 18 is a conventional meshing type kneading machine. FIG. 2 is an explanatory diagram of the material flow state in the mold kneader. ■, 2...-rotor, 3-6-rotor tip, 8--rotor blade front surface, 9... rotor blade back surface, 13-
・-Hopper, 14-・-Pushing ram, 15- Door section,
17-long wing, 18-short wing, 20-official material, 22-
pin. 1st cause 3rd figure β:bi p=, pv'β・文°β・ga β・ga β:
30゜0-ri K-1/3 K=l/3 N□i
67 K=/, 15 K:/, /r K=
X6'1,'*y'77p4Za'lI;”
? +j;4-", z4L!!lr'>Figure 6

Claims (1)

[Claims] (1) In a kneading chamber sealed by a casing and an end frame, in which a pair of meshing rotors are arranged side by side so as to be rotatable in opposite directions, over 1/2 or more of the axial length of the rotors. , a closed-type kneading machine characterized by having a plurality of pins arranged in the rotor wing body.