SU821177A1 - Head to extruder for making tubular polymeric articles - Google Patents

Description

(54) HEAD TO EXTRUDER FOR MANUFACTURING

TUBULAR PRODUCTS OF POLYMERIC MATERIALS

one

The invention relates to the processing of polymeric materials and can be used for the manufacture of extrusion tubular products from polymeric materials.

The known head to the extruder for the manufacture of tubular products from polymeric materials, comprising a housing, a mandrel, a matrix, adjusting bolts 1,.

The disadvantage of the head is one. the thickness of the products being poured.

The known head to the extruder for the manufacture of tubular, products from polymeric materials, comprising a housing, a mandrel, a matrix, a clip with an eccentric, installed with the possibility of its movement in the direction perpendicular to the longitudinal axis of the holok 2. This head is the closest to the technical essence of the invention .

The disadvantage of the head is the low accuracy of adjusting the thickness of the product.

The aim of the invention is to improve the accuracy of controlling the thickness of the product.

This goal is achieved by the fact that the head to the extruder for the manufacture of tubular products from polymeric materials, containing a body, a mandrel, a matrix, a clip with an eccentric, mounted to move in the direction perpendicular to the longitudinal axis of the head, according to the invention, the head is provided with an additional clip with an eccentric, installed with the possibility

0 moving parallel to the longitudinal axis of the head, each of the clips being hinged on the body and provided with two rigidly connected with it stops that are acting as

5 with a matrix.

FIG. 1 shows a general view of the head; Fig, 2 is a section along the A-L; in fig. 3 - section along BB; in fig.

4 is a top view of the head; in fig.

0

5 is a side view; in fig. b - kinematic scheme of matrix movement.

The head includes a housing 1, in the front part of which, with the aid of a screw 2, the arresters 4 are fixed pivotally with three main supports rigidly fixed in the middle part, the additional holder 5 with two supports 6 rigidly fixed in the middle part, the additional holder 5 articulated to 0. casing 1 with screw crowns

7, a matrix 8, .dorn 9, a clamping nut 10, vertical and horizontal eccentrics 11, 12 with handles 13,14 rigidly fixed with them, 13,14 tucked in springs 15,16. In the middle part, the head has a cavity in which, with the help of a key 17, a replaceable insert 18 is fastened, in the front part of which there are three evenly spaced around the circumference of the groove 19 for passing the mixture to the groove and channel

20dl air passage through the nozzle

21 into the cavity of the mandrel 9. Replaceable inserts 18 have an internal parabolic surface 22, the implementation of the insertion 18 replaceable allows you to process mixtures with one golrvka

with different plasticity, selecting, depending on the characteristics of the mixtures being processed, the contributions with the corresponding parabolic curvature.

The annular gap 23 serves to pass the mixture, the flange 24 for draining the mixture through the valves. A clamping nut 25 is inserted into the head from the opposite side; the inner core of which is loosely inserted by the pipes Dorn 26 with the stop 27, the head inside has channels 28 for heating or a cooling agent through the nozzle 29. The fastening of the head to the extruder is carried out by means of four bolts 30 with restrictive nuts 31 screwed on them.

The head works as follows. To extrude the tubes through oblique channels formed by the floating mandrel and pressure nut 25, the mixture from the extruder is fed, which is compressed in these channels, turns the rotary motion in 26 and then enters the chamber with a parabolic surface 22.

In the chamber, the elastic stress is removed, the mixture is mixed and moves in two directions, one to the center of the chamber, and an annular slit, after which the mixture passes through three grooves 19 and is syringed into the tube when pressed through the annular slit formed by mandrel 9 and matrix 8. Another portion of the mixture containing inclusions is discharged through the output channel.

In the case of misalignment of the matrix 8 and mandrel 9, a tube having a different wall thickness around the circumference can be acquired, which is determined by the deflection of the tube at the outlet in one direction or the other, when it is extruded, the tube deviates to a smaller thickness. To eliminate this defect in the resulting product, the matrix 8 is moved relative to the mandrel 9 while turning the knobs 13 or 14, depending on the nature of the deviation. When the handle 13 or 14 is rotated, the corresponding eccentric 11 or 12 moves in the slots of the main or additional sleeves (3 or 5), while the stops 4 and 6 move the die. The amount of movement is determined on a scale. The use of the structure allows to obtain mixtures with a high degree of purification, which is especially important in the case of manufacturing thin-walled tubular products. The resulting products have a constant wall thickness according to diameter.

Claims (2)

1. Kaplun Ya.B., Kim B.C. Forming equipment extruders. M., Mechanical Engineering, 1969, p. 27, R. 19. 2. USSR author's certificate  498176, cl. at 29 F 3/10, B 29 F 3/04, 1974 (prot from). A: (rig.} W