KR20020007103A - Dies for pipes made of synthetic resin - Google Patents

Abstract

PURPOSE: A die for manufacturing a synthetic resin pipe is provided to have linear structure with a spiral winding direction of a resin bar extruded by the rotational force of a die or a spiral partition by using the pressure of resin extruded by the extrusion force of an extruder. CONSTITUTION: Synthetic resin material is extruded to a transfer frame and transferred to inner/outer rotatable dies. The synthetic resin is extruded through left/right spiral protrusions and left/right extrusion ports as the rotatable dies rotate in each opposite left/right direction. Plural reinforcement resin bars are extruded in each circumferential direction. Both left and right bonding bars of the reinforcement resin bars are integrally formed to the inside and outside of a spring. At the same time, the reinforcement resin bars are spirally wound up in each opposite left/right direction inside and outside a reinforcement resin bar. A part of material for the reinforcement resin bar is extruded between the rotatable dies and the transfer frame when the material is transferred to the left/right spiral protrusions and the left/right extrusion ports of the rotatable dies. The rotational force of the left/right extrusion ports is reinforced as gears and chains are assembled to the rotatable dies. Therefore, productivity is enhanced.

Description

Dies for the manufacture of plastic pipes {.}

The conventional manufacturing apparatus for pipes made of synthetic resins used as water pipes, pressure pipes, gas pipes, etc. is extruded in the extrusion length direction, and the pipes are molded and cooled while being stretched to some extent. Since the tensile strength in the longitudinal direction of the pipe product is high but the tensile strength in the width direction is low, it provides fragility such as internal pressure, hydraulic pressure, and freeze, so it is configured to be extruded while rotating the die structure by using the extrusion pressure of the extruded resin. As the extruded resin band is moved in the spiral winding direction, the resin bands are intersected left and right on the inside and the outside of the resin band of the pipe to be integrated.

In the conventional extruder die, the direction of the resin band extruded using the rotational force of the die or the spiral plate using the pressure of the resin extruded by the extrusion force of the extruder provides a linear structure in the spiral winding direction.

1 is an overall assembly view of the present invention

2 is a partially cut away cross-sectional view of the main portion of FIG.

3 is a cross-sectional view of main parts of the main part of FIG. 2;

Figure 4 (a) (b) is a detailed expanded view of the main portion of FIG.

5 is a partially cut away perspective view of a product made in accordance with FIG.

6 is a sectional view of main parts of an embodiment of the present invention;

FIG. 7 is a partially cut away perspective view of a product made according to FIG. 5; FIG.

8 is a perspective view of main parts of FIG. 7;

[Description of Major Symbols in Drawing]

10. Dies 11. Inner mold 12. Outer mold 13,14. Rotary dice

16,16 '. Spacing 20. Feedframe 21,22. Bearing 23. Secondary Dies

24,24 '. Gear 25,25 '. Chain 26, 26. Left and right direction

27. Buffer 28,28 'Reinforcement resin 34,36. Left and right helix

35,37. Left and Right Extruder

According to the present invention, the outer die 11 and the inner die 12 of the pipe die 10 in the conventional extruder are inserted into the grooves 31 and the bearings 21 and 22 for assembling the rotary die at the transfer portion of the raw material. Consists of the projections 32 for assembling the bearing 21 on the body of the outer rotary die 13, 14, but the transfer frame 20 through which the raw material extruded from the extruder 35 is transferred to the extruded portion 24. A plurality of right helix protrusions 34 and right inlet / outlet holes 35 formed on the inner side of the inner and outer rotary dies 13 and 14 based on the extruding force of the raw material, and the raw material is extruded while the raw material is extruded. It forms a plurality in the circumferential direction and the inner rotating die rotates in the right direction to constitute a plurality of helical protrusions 36 and left inlet and outlet 37 in which the raw material is extruded in a circumferential direction.

At this time, the feed material is also extruded in the interval (16, 16 ') between the inner diaphragm and the transfer frame 20 of the rotating body to form a configuration of the buffer pipe (27).

Therefore, the effect is that the synthetic resin raw material extruded from the extruder is transferred to the inner and outer rotary dies 13 and 14 while being extruded into the transfer mold 20, and the left and right helix protrusions 34 and 36 and the left and right extrusion are extruded. Rotating dies 13 and 14 are rotated in opposite directions to the left and right while passing through the spheres 35 and 37 to extrude the reinforcing resin bands 26 'and 28' in the circumferential direction, respectively. While extruding a large number of pieces, the left and right fusion zones 26a and 28a of the left and right reinforcement resins 26 'and 28' are integrally integrated with the inner and outer surfaces of the buffer pipe 27 while being firmly formed and cushioned. The invention relates to a die configured to be welded to the inner and outer surfaces of the resin zone 27 while spirally winding in the opposite direction to the left and right sides, respectively. In the extrusion, the raw material extruded from the raw material feed frame 20 is pressed with the left and right spiral protrusions 34 and 36 of the inner and outer rotary dies 13 and 14. When it is conveyed to the outlet 35 and 37, a part of raw material is extruded and shape | molded by the space | interval between the inner and outer rotary dice 13 and 14 and the conveyance frame 20. As shown in FIG.

Reference numeral 23 is an extrusion aid dice connected in the inner mold 12 to guide the extruded resin raw material to be molded. Further, 30 and 31 are ring for preventing the leakage of raw materials.

In addition, in the embodiment of the present invention shown in Figure 6 of the inner and outer sides of the buffer resin (27 ') only one side of the rotating die (34) and a plurality of extrusion holes 35 formed in the circumferential direction 32, the die of the present invention is provided. In addition, productivity is improved by assembling gears 24, 24 'and chains 25, 25' with the rotating dies 13 and 14 by a suitable device to reinforce the rotational force of the left and right extrusion holes 37. It is an invention to reconsider.

The present invention is a die for the extruder 32, the inner and outer dice are formed by the resin extrusion force of the left and right helix protrusions 34, 36 and the rotary die 13 (37) (37) 14) by assembling the bearings 21 and 22 on the inner and outer sides of the raw material feed frame 20, and reinforcing resin 26 'on the inner and outer sides of the buffer resin 27 when the resin is extruded. It is a useful invention that provides a linear structure of a resin in a network structure as compared with a conventional synthetic resin pipe, which is a die configured to be integrally fused and molded while spirally winding 28 ') to the left and the right.

Claims (3)

Rotating dies 13 in which inner and outer dies 11 and 12 of the extrusion die made of a synthetic resin are formed, and a raw material conveying path 20 is formed to an extrusion hole, and the bearing 21 is assembled into the groove 31 and the protrusion 32. 14, a plurality of entrance and exit holes 35 and 37 formed of left and right spiral protrusions 34 and 36 and auxiliary plates 35 'and 36' on inner and outer surfaces thereof are formed in a circumferential direction. Dies for making synthetic resin pipes The die for manufacturing a pipe made of synthetic resin according to claim 1, wherein a spiral protrusion 34 and an extrusion hole 35 are formed on only one side of the raw material transfer path 20. The die for making pipes of synthetic resin according to claim 1 or 2, wherein the rotary gears (24) and (24 ') and the gears (25) and (25') are assembled to the rotary dies (13) and (14).