CS242237B1 - Push broaching device for thread-cutting push-down broaching machine - Google Patents

Abstract

The invention relates to an extruder for a screw extruder the essence is that the extrusion matrix (4) is fitted at the shaft outlet or directly on the screw (10) and is rigid with it in a co-shop rotatingly connected and where from the side the screw (10) is a given extruder with wipers (9) firmly connected with carriers (2) or created as a direct part of the carrier (2). Extrusion die (4), structurally tube-shaped, circumferentially provided holes oriented perpendicular to the axis of the screw (10) is using this directly screws (poured. The screw is provided with a divider (12).

Description

BACKGROUND OF THE INVENTION The present invention relates to an extruder for a screw extrusion machine comprising a circular thatch or a tube-shaped extrusion die, a structural design, which solves the problem of cutting extrusions and the problem of increasing specific power when reducing axial force to the screw.

The presently known extrusion devices are designed to be stationary, with matrices provided with holes arranged substantially parallel to the axis of the screw. The diameter of the die corresponds to the approximate diameter of the screw, the thickness of the die being limited by strength. The extrusion of the extrusions is usually carried out by a separate cutting mechanism, usually arranged outside the die. Since the inside of the die, on the side of the screw, is not wiped off, material build-ups occur between the die holes during extrusion, which make extrusion considerably more difficult. Such a extrusion process is energy intensive.

These drawbacks are eliminated by the constructional solution of the device, which is based on the fact that the extrusion die is mounted at the shaft outlet or directly on the screw and is rotatably connected in co-engagement therewith. On the worm side, the extruder is provided with wipers fixedly connected to the carrier or formed as a direct part of the carrier.

The extrusion die, which is designed in the form of a tube, as a further possibility of solution, is provided circumferentially with holes oriented perpendicularly to the axis of the screw, which is still provided with a deflector.

The novelty of the solution is that the extrusion die in the shape, whether in the form of a circular perforated thatched or tubular type, is rotated, respectively. rotates together with the screw, the extrusions being cut off by one or more cutters or wipers. On the side of the screw, the die is rotated with at least one stationary wiper during rotation.

It is an advantage of the solution according to the invention that the rotating dies allow simple stationary knives to be used to cut the extrusions. Furthermore, they allow better visual control of the extrusion. With suitable theological properties of the extruded material, the extrudates themselves break off by spinning the matrix and disperse by centrifugal force on a larger flat which is advantageous for drying the extrudates in belt driers. By varying the length of the tubular screw, it is possible to vary the surface area of the die in a wide range and thereby to adjust the specific power of the extruder.

In the accompanying drawing, FIG. 1 is a partial cross-sectional elevational view of a design of a die-extrusion die.

In FIG. 2 of the accompanying second drawing, a partial cross-sectional view of a tube-type extrusion die is shown.

Fig. 3 shows one variant of the wiper solution and arrangement in conjunction with thatched-type rotary dies.

Fig. 4 of the accompanying third drawing shows a second variant of the arrangement and shape of the wiper in conjunction with a thatch type extrusion die.

Fig. 5 in the accompanying third drawing shows one variant of the arrangement and shape of the wiper in connection with a tube-shaped extrusion die with holes arranged perpendicular to the axis of the screw.

Fig. 6 shows a second possibility of a construction according to the invention relating to the shape and bearing of the wiper in connection with the tubular type of the die.

An extrusion device according to the invention with an extrusion die arrangement according to FIG. 1, consists of a housing 1 of a screw 10, to which a wiper carrier 2 is attached by means of screws 3, onto which a thatch type die 4 with holes 5 arranged parallel to the axis of the screw 10 is supported. a spring 6 is inserted between the carrier 2 and the die 4 to prevent leakage of the extruded material through the gap between the die 4 and the carrier 2.

Tube-type extrusion die 4 of the apparatus of the invention as shown in FIG. 2, it is provided with holes 5 arranged perpendicular to the axis of the screw 10 and is bolted 11 directly to the screw 10 in a fixed manner, in co-engagement with the latter. The screw 10 in this arrangement is further provided with a divider 12. The wipers 9 are formed as a direct part of the carriers 2, which are screwed to the housing 1 of the screw 10 by screws 3.

Claims (3)

SUBJECT An extruder for a screw extruder comprising a circular thatch or tube-shaped extrusion die, characterized in that the extrusion die (4) is mounted at the shaft outlet or directly on the screw (10) and is rigidly, in and wherein, on the side of the screw (10), said extrusion device is provided with a screen (9) fixedly connected to the carrier (2) or formed as a direct part of said carrier (2). The extrusion device according to claim 1, characterized in that the extrusion die (4), which is designed in the form of a tube, is circumferentially provided with openings oriented perpendicularly to the axis of the screw (10), which is still provided with a deflector (12).