JPH0155981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a cone-type kneader that receives viscous materials such as plastic materials and rubber kneaded by a batch-type kneader in the preceding stage and sends it to a preforming machine in the latter stage or an extruder for a plastic molding machine. Regarding extruders.

A conventional cone type extruder has a structure in which screw type blades are formed all over the rotor from the tip to the root, and the rotor axis is supported generally horizontally. In addition, the wall surface of the extrusion chamber container through which the rotor shaft passes is a surface perpendicular to the rotor shaft;
In other words, it was formed flat.

The fact that the screw-type blades are formed all the way to the base of the rotor shaft has the disadvantage that the material that has already been sufficiently kneaded by a kneader etc. will be over-kneaded as it will be kneaded again by the blades directly below the input port. In addition, if a large amount of material is input at once, the load on the blade directly below the input port will be large, so the size of the input port should be limited, and large materials in the form of rubber lumps should be placed in advance to the extent that they can be input beforehand. I had to cut it to size.

Further, in conventional extruders, the rotor axis is horizontal, and the wall surface of the extrusion chamber container through which the rotor shaft passes is formed flat, so there is a drawback that material remains on the wall surface and the bottom of the container. On the other hand, if the blades at the root of the rotor shaft are formed close to the container wall, the rotor axis directions are not parallel to each other, so it is necessary to keep the diameter of the root portion within a range where the trajectories of the two rotors do not overlap with each other. , or if they overlap each other, a recess (recess) must be provided in the wall to prevent interference with the wall.

The purpose of the present invention is to make the material input port as large as possible, so that even huge lumps can be input without a pre-process, and even when a huge amount of material is input, it is possible to prevent the material from being over-kneaded. It is an object of the present invention to provide a cone type extruder that does not apply a large load to a rotor shaft and does not leave any material in a container.

The cone-type extruder of the present invention is a cone-type twin-screw extruder in which the distance between the rotor axes gradually decreases as it approaches the tip, and the twin-screw rotor axes 4 and 5 are tilted and supported so that the base is high and the tip is low. Conical surfaces 32 and 33 are formed on the container wall surface 16 through which the biaxial rotor shafts pass, and the conical surfaces 32 and 33 are concentric with the respective rotor axes. The apex angle (2α) of is (180° − β), and the generatrix from the apex of one conical surface to the apex of the other conical surface, and from the apex of the other conical surface to the apex of one conical surface It is characterized by the fact that the opposite bus line is on a straight line 34.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a partial sectional view of a plan view of an embodiment of the present invention, and FIG. 2 shows a partial sectional view of a front view of the embodiment.

The extruder container 1 has a biaxial cone shape with a tapered tip, and has a material input port 2 opening above the base and a discharge port 3 opening at the tip. The rotors 4 and 5 rotating within this container are supported by bearings 6 and 7 and bearings built into the worm reducers 8 and 9, and pass through the inside of the worm reducers 8 and 9 and have rotary joints 10 and 10 at their tips. 11 is provided, and a flow path for circulating cold water or hot water to the rotor shaft core is bored. Ribbon-type stirring tools 12, 13 are provided at the portions of the rotors 4, 5 directly below the material input port 2, and screw-type blades 14, 15 are provided at the tips thereof. rotor shaft 4,
5 is supported with an incline such that the base side is high and the tip is low, and the bottom of the container 1 is also as shown in FIG.
It is inclined so that the discharge port 3 is the lowest.

The screw-type blades 14 and 15 have a press-in part that maintains the internal pressure of the extrusion part while feeding input material into the extrusion part, and an extrusion part whose outer periphery is completely surrounded by a container and which pushes the material out from the discharge port at a predetermined pressure. It can be considered separately. The size of the inlet 2 is approximately rectangular, with a width that is almost comparable to the width of the container 1, and an axial length that extends from above the wall surface 16 at the rear end of the container to above the press-fitting part of the screw type blade described above. One important feature is that it is much larger than the conventional one.

The ribbon-type stirrers 12 and 13 extend toward the base of the cutting edges of the screw-type blades 14 and 15, are formed close to the inner peripheral surface of the container, and have their tips supported by supports 17. In this way, by omitting the blade directly under the input port, it is possible to eliminate over-kneading of the material and unnecessary load, reduce the driving torque, and to scrape off the material adhering to the inner wall of the container and send it to the press-fitting section. is fulfilled.

In the worm gear reducer 8 or 9, as shown in FIG. 3, a through hole into which a rotor shaft is fitted is bored in the boss of the worm gear 23, and radial thrust shafts 24, 25 are built in on both sides of the through hole. Worm shaft 26
is supported by bearings 27 and 28, and the outer shafts of all the bearings are held in a housing 29.

Worm shafts 26A, 2 of worm reducers 8, 9
6B has timing pulley (toothed belt wheel) 1
8 and 19 are fitted, and a timing belt (toothed belt) 22 is stretched between a timing pulley 21 provided on the output shaft of the motor 20, and both rotor shafts are driven synchronously.

Instead of the synchronous transmission using the toothed pulley and the toothed belt, the two rotor shafts 4 and 5 can be synchronously transmitted by chain transmission or gear transmission. As described above, it is yet another important feature of the present invention that a worm reducer is provided at the base of each rotor shaft, and that each worm shaft is synchronously driven by a single power source.

As shown in FIG. 4, the wall surface 16 at the rear end of the extruder container 1 is integrally formed from a single stainless steel plate. This wall surface 16 has through holes 30 and 31 through which the two rotor shafts 4 and 5 pass, and conical surfaces 32 and 33 that are concentric with the rotor shafts are formed. The conical surfaces 32 and 33 are close to the rotation locus of the roots of the ribbon-type stirring tools 12 and 13. Moreover, the center of the through holes 30 and 31 of the wall surface 16,
That is, the vertices of the conical surfaces 32 and 33 are in a straight line. In other words, a generatrix extending from the apex of one conical surface 32 to the apex of the other conical surface 33;
A generatrix extending from the apex of the other conical surface 33 to the apex of one conical surface 32 is on a straight line 34. FIG. 5 shows a schematic diagram of a cross section passing through the apexes 0 ₁ and 0 ₂ of the conical surfaces 32 and 33 and the axes 4A and 5A of the biaxial rotor shaft. When the angle between the axes 4A and 5A is β, the relationship between the apex angle 2α of the conical surfaces 32 and 33 is as follows: β=180°−2α…(1) or 2α=180°−β…(2) holds true. The edge 35 opening into the inlet 2 is straight, and the wall surface 36 adjacent to this edge is vertical. By forming the wall surface 16 into a conical surface in this way, the support column 17 and the stirring tool 12 (or 13)
Since the tip of the machine rotates while always being close to the wall surface, no material remains attached to the wall surface.

According to the present invention, the container wall surface through which the biaxial rotor shaft passes is formed into a conical surface, and the portion of the container wall surface sandwiched between the biaxial rotors forms one plane, so that the biaxial rotors are mutually connected to each other. Even in the case of overlapping, it is possible to bring the rotor locus close to the container without providing a relief as in the conventional case, and therefore it is possible to simplify the wall shape and perform stirring without leaving any material on the wall. Furthermore, since the container wall surface is formed into a conical surface and the rotor axis is inclined, no material adheres to the inside and does not remain. In addition, as shown in the example, the screw type blade at the base of the rotor shaft is omitted and the material input port is formed in a large size, making it possible to input large lumps of rubber-like material all at once without dividing it. Moreover, since the load on the rotor shaft is small, high productivity and ease of use can be obtained even with small power.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view of an embodiment of the present invention, Fig. 2 is a front sectional view thereof, and Figs. 3 a and b are plan sectional views and front views showing the internal structure of the reducer 8 (or 9) of the above embodiment. FIG. 4 is a sectional view and a perspective view showing the end face of the container of the above embodiment. Figure 5 shows the conical surface 3 in Figure 4.
2, 33 vertices and the axes 4A, 5A of the two-axis rotor shaft
FIG. 1...Extruder container, 2...Material input port, 3...
Discharge port, 4, 5...rotor shaft, 8, 9...worm reducer, 16...container wall surface.

Claims (1)

[Claims] 1. In a cone-type twin-screw extruder in which the distance between the rotor axes gradually decreases as it approaches the tip, the twin-screw rotor axes 4 and 5 are tilted and supported so that the base is high and the tip is low, Conical surfaces 32 and 33 concentric with the respective rotor shafts are formed on the container wall surface 16 through which the biaxial rotor shafts pass, and when β is the angle between the axes 4A and 5A of the biaxial rotors, the apex of the conical surfaces is formed. The angle (2α) is (180° - β), and the generatrix runs from the apex of one conical surface to the apex of the other conical surface, and the generatrix runs from the apex of the other conical surface to the apex of one conical surface. A cone type extruder characterized in that the and are on a straight line 34. 2. The cone extruder according to claim 1, wherein a screw-type blade is formed at the tip of the two-screw rotor shaft, and a ribbon-type stirring tool is formed at the root of the rotor shaft inside the container.