KR840000513B1 - Closed type mixing kneading apparatus - Google Patents

Abstract

The mixer comprises two parallel rotors (1) in a mixing chamber, rotating in opposite directions, having at least one long spiral blade(2) and one short one(3), which are connected to a drive to rotate them. At least one short blade of each rotor may be along the longitudinal axis of the rotor. The mixer produces good microscopic and macroscopic dispersion. It gives good results with carbon-impregnated rubber. It can be applied to rotors with any number of blades.

Description

Hermetic Kneading Dough

1 is a plan view of a conventional standard two-wheeled rotor.

2 is a plan view of a conventional standard four-exposure.

3 and 4 are cross-sectional views taken along lines III-III and IV-IV of FIG. 1, respectively.

5 and 6 are cross-sectional views taken along lines V-V and VI-VI of FIG. 2, respectively.

FIG. 7 is a development view showing the relationship between the blades and barrels of the two-expeller.

8 is a cross-sectional view corresponding to the VIII-VIII line in FIG.

9 is a flute diagram showing the overlap rate of a conventional two-stroke.

10 is a characteristic diagram showing the limits of the shape and arrangement of the wings of the present invention.

11 is an explanatory diagram showing the motion of a conventional two-rotor material.

Fig. 12 is an explanatory diagram showing the motion of the material of the two-expeller of the present invention.

13 and 14 are explanatory views each showing the movement of the material of the barrel communicating portion in the present invention.

15 is a plan view showing one embodiment of the rotor of the present invention.

The present invention relates to an improvement of a closed kneading kneading apparatus.

) 약품제의 혼련(첨가제와의 혼련)에 적합한 믹서로서 타이어제조 등의 고무공업에 있어서 불가결의 기계설비이다.The closed kneading kneading apparatus is a batch kneader suitable for kneading rubber or plastic, and in particular, rubber kneading (carburizing kneading), carbon master batch kneading or kneading (加加)

A mixer suitable for kneading of chemicals (kneading with additives), which is an indispensable mechanical equipment in the rubber industry such as tire manufacturing.

The closed kneading kneading apparatus has two rotors each having two rotor blades, one long blade 2 and one short wing 3, on one rotor 1, 1, as shown in FIG. As shown, there are four rotors each having two long wings 2 and short wings 3 and four blades in total in one rotor 1 and 1, respectively.

As shown in FIGS. 3 to 6, the material 5 during kneading has a high shear when passing through a narrow space (tip clearance) between the tip 6 of the rotor and the kneading barrel 4. Under the action, strong plasticization is achieved, and at the same time, microdispersion proceeds. On the other hand, the rotor blades are twisted in the direction of pushing the material toward the center as indicated by the arrows of FIGS. 1 to 2, and the two rotors are given a constant rotation ratio. By the arrangement and the rotation ratio of the rotor, the materials are kneaded and mixed, so that the whole material is homogenized and the additives are dispersed in the macro. In this way, the kneading action of the hermetic kneading kneading apparatus is a polymerization of a shearing action and a mixing action. Comparing the two and four rotors, the four rotors have twice the number of tips of the two rotors, so that they can perform higher shearing action and achieve microdispersion of additives or microdispersion of additives in a short time. have. On the other hand, the two rotors can be said to be a mixed action medium type. For example, four rotors are effective in the initial kneading and the carbon master batch kneading of natural rubber, and two rotors are excellent in the chemical dispersion (professional kneading) such as plasticizer.

The specificity of each rotor in such a kneading method, on the other hand, is also a drawback. In particular, in recent years, due to the hardening due to the filament of rubber filaments of the rubber or the softening of the oil filament of the rubber progresses, as a rotor of any one of the two or four rotor of the phenomenon It is becoming harder to match the material.

The present invention has been studied in order to solve such a conventional problem, and in the two-input rotor, the high macro dispersion capacity (mixing action) of the two-increaser is further increased, and the plasticizing capacity (shearing capacity) close to the four-injector. It is to provide a rotor capable of exerting a) and corresponding to a wide range of materials.

The present invention is a kneading kneading apparatus having a rotor (two rotors) provided with two blades in one goer, each blade being twisted in a direction of moving the material from the end of the mixing chamber of the mixer toward the inside. It is formed, the blade length of the rotor of each blade is formed long, and the blade twist angle is also set in a certain range, thereby increasing the amount of overburp on both blades.

The closed kneading kneading apparatus allows the two rotors to rotate in opposite directions so that each rotor is accommodated in a cylindrical barrel provided with cooling or heating means, and each barrel has a kneading chamber of a shape each connected by a communicating portion. It is a mixer. The material injected from the hopper port installed in the upper part of the communication part is pushed into the kneading chamber by the pulling action due to the rotation of the two rotors and the pushing action of the floating weight installed in the hopper port, and sheared into the two rotors in the kneading chamber. V) kneading action such as homogeneous plasticization of material or micro dispersion and macro dispersion of materials by taking action and mixing action. The shearing action is mainly performed between the tip of the blade of the rotor and the wall of the kneading chamber. The larger the number of wings and the longer the blade, the larger the shearing action. On the other hand, the mixing action is complicated by the arrangement of the wings, the angle of the blade warping, the length of the wings, or the rotation ratio of the two rotors. It depends on the ability to move the material over a wide range of interiors.

According to the results of long-term use of the closed kneading kneading machine and the results of the research, it is possible to allocate a space in which the material is easy to move to the kneading room or to increase the flow rate and the distance traveled axially along the wings It turned out to be important. Therefore, the theoretical review was added to the shape and arrangement of the two-injector, which further enhances the excellent mixing effect of the two-injector and exhibits an action close to the four-injector.

The developed and sectional views of the two rotors during material kneading are shown in FIGS. 7 and 8, respectively. In the figure, the hatched portion represents the region filled with the kneading material. Conventional arrangement of two-wing rotors is twisted so as to send material to the center of the rotor, the starting point A. C of the two blades is shifted by 180 ° in the circumferential direction, and B of the wing W ₁ point and point C of W ₂ wings, but unlike situated in the 90 ° position, which was adopted iteoseoyi configuration to review, because quite reasonable balance in the rotation, mechanical strength and the mixing performance of the rotor. Also when the B point and the C point is positioned different than 90 ° position to each other, because interference action of W ₂ with wings for the passage of material in accordance with the W ₁ wings is almost negligible, the shearing action and the mixing action of the wings W ₁ It can be explained only by the wing shape of the wing, and moreover, the positive action of the W ₁ wing may be considered as the kneading action of the entire hermetic kneading apparatus.

Movement of the material of the upper wing W ₁ is considered as divided in a flow (flow rate Q2) passing through the tip of the flow of the wings W ₁ (the flow rate (流量) Q ₁₎ and the wings W _1. In addition, the material flowing along the blade W ₁ flows in a direction perpendicular to the axis at the flow rate Q ' _{1 at} the opening of the blade W ₁ . Q _1, Q _{2, and} Q ' ₁ are expressed by the following equation when the flow of these materials is the pull flow between the parallel surface of the rotor surface and the barrel inner wall.

In order to increase the shearing effect on the material, a large amount of material must be passed through the tip. Therefore, Q2 may be increased, and V and HC may be increased according to the machine size and operating conditions, thereby increasing l1.

Fig. 9 shows the overlap rate of the conventional two rotors. The ohrap ratio of the conventional two-row rotor is 0.15 or less, which means that the total length of the _two blades (l ₁ + l ₂ ) is 1.15L or less. Therefore, in order to exert a higher shearing action as compared with the conventional two-rotor, l ₁ and L ₂ may be set so that the total length of the two blades is 1.15 L or more, preferably 1.2 L or more. That is, it is necessary to make the length l ₁ of one blade at least 1.2L / 2 = 0.6L or more.

On the other hand, in the past experience of rubber kneading, the length of one wing needs to be 0.9L or less in order to prevent the rubber from burning in the end frame of the mixer. This is because the wing opening becomes narrower to impair the mixing action. Therefore, the lengths l ₁ and l ₂ of the blades fall within the following ranges.

By lengthening the wings in this way, in the example of FIG. 7, the flow rate reaching the other end of the starting point A axis of the _W1 wing is increased, thereby moving the material in the axial direction over a long distance, You can expect the effect to increase.

Moreover, in order to fully exhibit the mixing action, it is necessary to smoothly move the material in the axial direction. For this purpose, pressure rise does not occur at the wing opening portion at least due to the flow parallel to the blade _W1 . It is necessary to secure a predetermined amount of the wing opening part αL which reaches the other wing W2. In other words

It is necessary to satisfy the condition of.

Substituting the above formula (2) and (4) into the formula (6) yields the following formula since L1 = L-? L.

를 적어도 4회전이하로 날개개방부로 부터 통과시켜서 또 하나의 날개 W2에 이동시키는 Q₁의 절대량이 필요하다는 것을 알았다. 그래서 Q1은 하기(8)식을 충족해야 한다. 로우터가 1회전하는 시간 t는 t=bo/N (N는 로우터 회전수 r.p.m)이기 때문에,C ₁ is an integer, and in a two-stroke, C ₁ ≒ 5.0 is set by the machine size of the mixer body determined by the mechanical strength. Another factor that largely governs mixing is Q ₁ is the absolute amount. In the past experience and experiments, the volume of the material on the wing of W _{1 is} required to achieve a mixing effect of the same level as that of a conventional two-stroke.

It was found that the absolute amount of Q ₁ required to pass from the wing opening to the wing W2 at least 4 revolutions or less is required. So Q1 must satisfy the following expression (8). Since the time t the rotor rotates once is t = bo / N (N is the rotor rpm),

Substituting this formula into this equation (8),

In the case of the two-stroke, the mechanical strength is set to C2 C5.0.

θ0=26°인 경우에는On the other hand, it is necessary to change the position more than 90 ° in the circumferential direction to avoid the interference of the two blades with the end point B of the W1 wing and the start point C of the W2 wing, and the blade length l1 is limited by the twist angle θ1. In the two-injector, θ1 in FIG. 7 is almost 26 °, so θ1

If θ0 = 26 °

Where l1 = L-αL R / L = 1/2 (in the case of a two-rotor), (10) is as follows.

According to the above examination results, if the wing length and the twist angle are given so as to satisfy all the following conditions, the effect of preventing the movement of the material is eliminated, so that the mixing action can be improved as compared with the conventional two rotors. By lengthening the shear action can be increased. (A) In view of increasing the overlap rate of the blade

(b) From the viewpoint of maintaining the axial opening portion in a certain amount and ensuring the flow in the axial direction of the material

(c) in view of ensuring the absolute amount of flow along the wing;

(d) in terms of avoiding interference between the two blades and ensuring efficient mixing,

Even if this is done, the diagonal part 11 of FIG. 10 will become the range which satisfy | fills the conditions of each said Formula. As a result, at least one of the two rotor blades has a blade length l / L of 0.6 to 0.9, and a wing angle and a twist angle such that the blade warp angle θ is 10 ° to 40 ° and the overlap ratio of the blade is 0.2 to 0.8. It can be seen that the decision is made. In addition, it is obvious that the kneading effect is further increased when the two blades are set to 0.6 to 0.9 and the twist angle is set to 10 to 40 degrees.

In order to make the shearing action as high as possible within the above blade shape conditions, the plane shape of the rotor of the present invention with the overlapped 0.6 or more is shown in FIG. 15, and the unfolded shape of the wing is shown in FIG. Shown in In Fig. 15, reference numeral 20 denotes a wing, 40 denotes a communication portion, and OL denotes an overlap amount. In addition, A-A cross section and B-B cross section are the same shape as FIG. 4 and FIG. In this way, when the amount of overburp is set large, the material is smoothly handed over from one wing to the other wing even in the wing opening, so that the movement of the material in the chamber becomes larger and the length of the wing is extended so that the shear The action is also increased. In the conventional two-stroker, the flow of material is as indicated by the broken line 22 in FIG. 11, whereas the movement of the material of the present invention indicated by the broken line 21 is larger than in the conventional case.

In consideration of the interaction between the two rotors, since the rotor is given a predetermined rotation ratio, in the communicating section of each kneading chamber, as shown in FIGS. 13 and 14, mixing is performed according to the rotation positions of the rotors. The action or shear action occurs so that this action is larger than that of the conventional two-stroke.

That is, the material 2, as to move the long distance side B in the A side of the conventional because of the first rotation of 13 degrees rotation amount of the material in the axial direction between the W ₁ wing is added, and long, the wingspan of W ₁ wings Compared to the rotor, the mixing action is very high even in the continuous part. In 14-degree position, the wings by W ₁ and W ₂ of the rotor blade and the other materials are kneaded with each other, but the W _{1, W.} Since the wing length of the blade is long, high compression shear action occurs as compared with the conventional two-stroke.

As described above, the kneading and kneading apparatus equipped with the two-lower rotor of the present invention increases the mixing and shearing action of each of the respective rotors as well as the two rotors in the communicating section. The mixing action and shearing action by the interaction are also increased, and the mixing action and shearing action, that is, the kneading action of the whole mixer, are greatly increased.

EXAMPLE

Attached to the sealed kneading kneading apparatus (capacity 4.3l), the two-injector of the present invention, the first kneading of natural rubber and chemical compound mixing kneading (professional kneading) to the carbon compound, the conventional two-lower and four-wing The results compared with the rotor are shown in the first table.

As a result, in the rotor of the present invention, the plasticizing capacity (shearing action) is the same as that of the four rotors, the energy efficiency is the middle of the conventional two and four rotors, and the chemical dispersion capacity (mixing action) is the same as the rotor. It can be seen. In addition, in the present invention, the range of the wingspan ratio of 0.65 to 0.85 and the warp angle of 15 ° to 35 °, the range of the overlapping ratio of 0.3 to 0.7 is particularly good. Confirmed.

Claims (1)

The blades of each motor are distorted to move the kneading material inwardly from the end of the mixing chamber according to the rotational movement, and the ratio of the length of one blade of the permanent blades to the full length of the rotor is 0.6-0.9. A pair of two-wing rotors arranged in parallel in a mixing chamber, characterized in that the blade warp angle is 10 ° -40 ° so that the overlap rate of the wing and the other wing is 0.2-0.8 of the full length of the rotor. Eggplant kneading kneading apparatus.

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