JPH0612817Y2 - Paddle mechanism of twin-screw kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paddle mechanism of a twin-screw kneader used for kneading chemicals, chemicals, resins, foods, and the like.

[Prior Art] As an example of a twin-screw type kneader, FIG. In the figure, both ends of a casing 1 are closed, and a supply port 7 and a discharge port 8 are vertically provided at both ends, and two rotary shafts 2 and 2 are supported in a cantilevered manner by front and rear bearings 5 and 6. A large number of paddles 3a and screws 4 are fixedly attached to this rotary shaft. The conventional twin-screw kneader
Even if there are differences in details, if they are roughly classified, they are all included in any of these two-axis systems.

The twin-screw type kneader exerts a much more precise kneading action than other conventional types of kneaders, and it has an unparalleled feature in terms of mixing and kneading, and for that purpose Is a food item (eg chocolate, artificial sweetener,
Mochi, candy), chemicals, drugs (eg cosmetics,
It is often incorporated into the manufacturing process of poultices.

The characteristic of this mixing and kneading is mainly caused by the mutual system of a large number of paddles 3a attached to two parallel rotary shafts, and for example, an arbitrary cross section of the casing in FIG. 5 (a) is seen. As shown in Fig. 2B, two concave lens-shaped paddles 3a and 3a mounted on the two rotary shafts 2 and 2 in the gourd-shaped casing 1 are 90 ° out of phase with each other. Since it rotates in the direction, paddle 3
The tip of a comes close to the inner wall of the casing 1 just before contact, and during rotation, it always keeps close contact with the surface of the mating paddle, so that the material adhering to the surface is scraped off to achieve a so-called self-cleaning effect. To do. Fig. 5 (b)
Shows one cross section, the phase is changed coaxially with another paddle adjacent in the same direction as the paddle shown here. For example, as shown in FIG. 6C, the phase is changed by 90 °. It is continuous.

The materials supplied by such a combination of paddles are kneaded, kneaded and kneaded with each other as the process proceeds, thus performing a precise kneading unlike any other.

By the way, in such a paddle mechanism, as described above, the phase is different from that of the adjacent paddle that is coaxial, and since the phase is perpendicular to that of the paddle facing the other axis, there is a slight deviation in the axial position. If there is, the paddle that goes back and forth on the other axis will not be able to hesitate, and it will always hit and the biting rotation will stop.

It is unavoidable that the positional deviation naturally occurs due to a slight bending of the rotating shaft and a finishing error on the side surface of the paddle. For this reason, conventionally, as shown in FIGS. 6A and 6B, an annular protrusion 32a is provided around one side of the mounting hole 31a through which the rotary shaft of the paddle 3a is inserted, and the adjacent paddles are coaxially in direct contact with each other. Instead, a gap having the height Ha of the protrusion 32a is formed to prevent the above bite.

[Problems to be Solved by the Invention] As described above, in the twin-screw kneading machine, even a slight trouble may lead to the death of the product, and may cause a serious food accident. Therefore, the working conditions are extremely strict, and no matter how little foreign matter is mixed in, it is not allowed.

By the way, as mentioned in the previous section, annular ridges are provided between the paddles so that the paddles do not come into direct contact with each other, but as shown in FIG. When the paddles are adjacent to each other, the rear surface of the front paddle and the surface of the ridge 32a on the front surface of the rear paddle are in surface contact with each other, but the overlapping range when the front and rear paddles are overlapped is seen through from the direction perpendicular to the rotation axis. Then, in addition to the protrusion 31a, there is a portion formed by three curved lines as shown by the dots in the figure, and since this portion does not contact each other on the front and rear surfaces of both paddles, it forms a narrow gap and opens. When this void is named dead zone D, this dead zone D takes various forms depending on how the paddles are combined. For example, as shown in FIG. 6C, if the phases are connected alternately by changing the phase only at a right angle, the direction is at a right angle to the projection surface including the hatched portion.
It is sufficient to mass-produce paddles having a keyway, but in reality, when such a simple arrangement is sufficient, it is almost infinite, and it is a characteristic of the kneading machine to change the phase intricately to obtain the optimum function, If this function is fixed, the features will be killed and the meaning of adopting this unit will be lost.

However, the fact that such a dead zone is hidden by each paddle means that the raw material fitted into this dead zone remains as it is, and depending on the raw material, it may be decomposed or fermented, and this defective residue may be mixed in the product. Even the experience of being contaminated and defective is reported. With this, there is no choice but to adopt this machine for raw materials under severe conditions.

SUMMARY OF THE INVENTION In order to solve the problems described above, the present invention has an object to provide a paddle mechanism in which a dead zone is eliminated from between coaxially adjacent paddles of a twin-screw kneader equipped with paddles.

[Means for Solving the Problems] In the paddle mechanism of the twin-screw kneading machine according to the present invention, two rotating shafts are arranged in parallel in a casing having a supply port on one side and a discharge port on the other side, and each rotating shaft is rotated. It consists of a basic structure in which a kneading member combining a paddle and a screw is fixed to the shaft to form a kneading space with the inner surface of the casing. Seen through, it has a circular shape with the same shape as the overlapping area and has a circular hole with the same diameter as the mounting hole of the paddle, and the key groove provided in each paddle is attached to the circular hole at the position corresponding to the phase shift. The above-mentioned problem was solved by interposing a spacer made of a thin plate cut in the same number between the paddles.

[Operation / Embodiment] The operation of the present invention will be described with reference to FIGS.

1A and 1B show the paddle 3 according to the present invention, which has straight front and rear surfaces without an annular protrusion protruding from one side as in the conventional case. 2A and 2B are spacers 9 that are narrowly fitted between the paddles and fitted into the rotating shaft 2 and are made of a thin plate having a wall thickness T, and as shown in the front view, two adjacent sheets are attached. The paddle has a surface having the same shape as the overlapping common surface, and a mounting hole 91 having the same shape as the paddle and a plurality of keyways 82 are punched in the center. In this way, if a spacer with the same outer shape as the overlapping area of the adjacent paddles is seen through from the rotation axis, it is installed between the paddles, and the two paddles are attached to each other so that the outer peripheral surfaces of the paddles approach each other. Even if there is a slight deviation in the relationship or a slight bending occurs in the rotary shaft, it is possible to prevent an accident due to the contact between the opposing paddle surfaces. In addition, since there is no narrow space (dead zone) into which the raw material fits, unlike the ridge in the prior art, the cause of the raw material retention disappears.

FIG. 3 shows the paddles 3A, 3B, 3C attached to the rotary shaft 2 ...
It shows the state of ... viewed from the front.

FIG. 4 shows an embodiment with another paddle combination.
The phase shift of 5 ° is repeated, and the tip of the paddle draws a spiral locus and makes one round in four turns. In this case also, the paddles have a common surface where they are overlapped, and if the number of key grooves corresponding to the phase shift is cut by that number (4 can be used for 8 on the front and back). All aspects can be accommodated.

[Advantage of the Invention] The paddle mechanism of the twin-screw kneading machine according to the present invention has no blind spot on the row line of the paddle, and the cause of sticking the kneaded material to be left and causing deterioration of quality is drastically reduced. The surface of the paddle is fully utilized for the original kneading action, ensuring a highly reliable kneaded product.

[Brief description of drawings]

1 (a) and 1 (b) are a front view and a vertical sectional view showing a paddle of an embodiment of the present invention, FIG. 2 (a) and 2 (b) are also a front view and a vertical sectional view of a spacer, and FIG. 3 is an assembled paddle mechanism. FIG. 4 is a front view showing a spacer of another embodiment, FIGS. 5A and 5B are vertical cross-sectional views showing the general shape of a twin-screw kneading machine and their right-angle cross-sectional views, and FIG. (A), (b), and (c) show a front view, a vertical sectional view, and a front view in an assembled state of the conventional technique, respectively. 1 ... Casing, 2 ... Rotating shaft, 3 ... Paddle 4 ... Screw, 5, 6 ... Bearing 7 ... Supply port, 8 ... Discharge port, 9 ... Spacer T ... Spacer wall thickness, D: Dead zone

Claims (1)

[Scope of utility model registration request] 1. A casing having a supply port on one side and a discharge port on the other side, two rotary shafts are arranged in parallel, and a kneading member combining a paddle and a screw is fixed to each rotary shaft to fix the inner surface of the casing. In a twin-screw type kneader that forms a kneading space with the paddles, the adjacent paddles attached to the rotary shaft with different phases are formed in the same shape as the overlapping area when viewed from the direction perpendicular to the rotary shaft, and the paddles There is a circular hole with the same diameter as that of the mounting hole, and a spacer made of a thin plate is inserted between the paddles, and the key groove provided in each paddle is cut into the circular hole at the position corresponding to the phase shift. The paddle mechanism of the twin-screw kneader characterized in that