JPH0351115A - Two-stage vacuum extrusion apparatus - Google Patents

Abstract

PURPOSE:To render large-sized thrust bearings and packings unnecessary by providing at the transporting end of a transporting device a nozzle which serves to chop materials and push them out, and also providing a vacuum discharge exit at a communicating part. CONSTITUTION:In parallel biaxial roter shafts 4, 4 releasably supported by bearings 2, 3 at both ends of the casing 1 of a transporting device, symmetrical screws 5, 6 which transport materials are provided. On the other hands, an extruding device B is releasably supported by shafts 22, 23, and has parallel biaxial roter shafts 24, 24', further, at the left and right sides thereof, screws 25, 26 which extrude materials to the outer end are provided respectively, and rotationally driven by means of a motor 27. Furthermore, in a forwarding port 12, a nozzle 13 having a great number of small openings or a great number of slits is displaced, and the strign-shaped materials 16 extruded by the nozzle 13 descend through a communicating part 17 and then drop in the receiving port 18 of the extruding device. And, the communicating part 17 communicates to a vacuum source through an exhaust pipe 19, which acts to such and remove gases contained in the materials which fall in a shape of string. Whereby large- sized thrust bearings and packings become unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a two-stage vacuum extrusion device for extruding materials such as rubber and plastic while discharging gases contained therein by vacuum.

<Prior Art> Since a conventional vacuum extrusion device feeds the material from one side to the other, the rotor shaft receives a strong thrust in the opposite direction to the feeding direction, requiring a large thrust bearing.

In addition, a packing is required between the casing and the rotor shaft that passes through it, and this packing easily soaks in the wire to be mixed (r), so it has a short lifespan and requires frequent banking replacement, but the replacement work takes a long time. It takes time, and the pigment that soaks into the packing material discolors the next material.

<Problem to be Solved by the Invention> The problem to be solved by the present invention is to provide a vacuum extrusion device that does not require a large thrust bearing like the above-mentioned conventional extrusion device and does not require a packing. .

<Means for Solving the Problems> The present invention provides a transfer device including a rotor shaft provided in a casing with a screw having left and right helical angles in opposite directions for propelling materials in opposite directions; In order to propel the material in the direction opposite to the propulsion direction of the device and in the opposite directions to each other, extrusion devices having screws with left and right helical angles in opposite directions are arranged above and below, and The material is communicated through a communication part at the end, and the transfer end of the transfer device is provided with a nozzle for finely dividing and extruding the material, and the communication part is provided with a vacuum outlet. .

Effect> Since the rotor shaft receives thrust in opposite directions at the same time by the left and right screws having thrust in opposite directions, the thrust forces cancel each other out. In addition, since the material introduced from both the left and right ends of the casing is immediately sent toward the center by the rotor shaft, the leakage force of the material at both ends is extremely weak, and the material sent from the center to both ends is discharged to the outside at both ends. Therefore, in this case as well, the leakage force of the material at both ends is extremely weak, and gaskets at both ends are unnecessary.

<Embodiment> FIG. 1 is a front vertical sectional view showing an embodiment of the present invention. Transfer device [A] Parallel biaxial rotor shafts 4, 4' supported by bearings 2.3 at both ends of the casing 1 have bilaterally symmetrical screws 5, 6 that mesh with each other and transfer the material from both left and right ends to the center. is provided. A triangular baffle member 8 is fixed to the center of the material input tube 7, and the left and right sides of the baffle member 8 form hoppers 9 and 10. The rotor shaft 4 is rotationally driven by a motor 11.

On the other hand, the extrusion device B is supported by bearings 22 and 23 provided at both ends of the casing 21, and has two parallel rotor shafts.
4 and 24', and screws 25 and 26 are provided on the left and right sides of the screws 25 and 26 for extruding the material to the outer ends, respectively, and are rotationally driven by a motor 27.

A delivery port 12 is provided at the center lower end of the casing 11 of the transfer device A.
A nozzle 13 having a large number of small openings or a large number of slits is disposed therein, and a string-like material 16 extruded from this nozzle 13 hangs down a connecting part 17.
It falls into the receiving port 18 of the extrusion device. In addition, the connecting portion 17 communicates with a vacuum source (not shown) throughout the day of the exhaust pipe, and sucks out the gas contained in the material falling in the form of strings as described above.

The material degassed in this way falls into the receiving port 18 of the extrusion device B, is pushed outward by the screws 25, 26 provided on the rotor shafts 24, 24', and is pushed out through the discharge hole 2.
8 and extruded to the next stage of molding equipment, etc.

In addition, in the example to the north, the transfer direction of transfer device A was set to the center, and the transfer direction of extrusion device B was set to the opposite direction.
Conversely, the transfer direction of transfer device A is the outer end direction, and extrusion device B
It is also possible to carry out the transport direction in the central direction. In this case, the connections 17 are provided at both ends to the transfer device,
Further, the discharge hole 28 is provided in the center.

Although the above example uses parallel twin rotor shafts, when extruding a material that has low viscosity and does not adhere to the valleys of the screws on the rotor shaft, it is possible to use a single shaft system for both or one of the upper and lower stages. You can also.

<Effects of the Invention> According to the present invention, since the rotor shaft is configured symmetrically, the left and right thrust forces cancel each other out, and therefore a large thrust bearing is not required. In addition, according to the present invention, there is no need for a seal at the center of the rotor shaft, and the material leakage force is very weak at both ends, so a simple sealing mechanism is required, and the seal-less extruder can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front vertical cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 4.24... Rotor shaft 5.6, 25.26... Screw 13... Nozzle 17... Connecting part 19... Vacuum exhaust port

Claims (3)

[Claims] (1) A transfer device in which a rotor shaft having a screw with left and right helical angles in opposite directions is provided in a casing to propel the material in opposite directions, and in a direction opposite to the direction of propulsion of the transfer device, In addition, in order to propel the material in opposite directions, extrusion devices having screws with left and right helical angles in opposite directions are arranged above and below, and communicated through a communication portion at the end of the transfer device in the transfer direction. A two-stage vacuum extrusion device, characterized in that the transfer end of the transfer device is provided with a nozzle for finely dividing and extruding the material, and the communication portion is provided with a vacuum outlet. (2) The two-stage vacuum extrusion device according to claim 1, wherein the kneading device has two rotor shafts. (3) The two-stage vacuum extrusion device according to claim 1 or 2, wherein the extrusion device has two rotor shafts.