HDPE-wrapped reinforced drain pipe and method of processing the same

Abstract

The present application relates to the technical field of winding reinforced drainage pipe, and particularly relates to an HDPE winding reinforced drainage pipe and a processing method thereof; a spiral composite layer is made of PP material, and an inner layer and an outer layer are both made of HDPE material; the three layers are sequentially wound and formed from inside to outside; when the inner layer pipe is wound and formed, the cooperation of the protruding part and the recessed part can make the recessed part of the next circle press against the protruding part of the previous circle to be wound, so that the structure is more stable; the second winding unit of the spiral composite layer is matched and limited by the semicircular arc groove on the surface of the inner layer pipe, so that the winding stability of the spiral composite layer is also ensured; the outer layer pipe is limited by the cooperation of the semicircular arc groove and the second winding unit on one hand, and on the other hand, the protruding part of the next circle is pressed against the recessed part of the previous circle to be wound, so that the stability of the outer layer pipe is ensured; and the inner and outer pipe walls are both smooth arc surfaces, so that the heat melting connection of the pipe end is easier to be carried out compared with the corrugated outer wall.

Description

Technical Field

[0001] This invention relates to the field of spiral wound reinforced drainage pipe technology, and more particularly to HDPE spiral wound reinforced drainage pipe and its processing method. Background Technology

[0002] Chinese patent CN108775452A discloses a double-plastic reinforced composite spiral pipe that uses a combination of PP and PE, with an inner tube made of PP serving as a reinforcement for the annular protrusions, thereby achieving high ring stiffness while reducing the production cost of spiral corrugated pipes.

[0003] However, the production process of the composite spiral pipe involved in the above patent scheme requires the composite co-extrusion molding of irregular inner and outer pipes. Due to the material differences between PE and PP, this process is actually difficult to prepare, and the outer surface of the spiral pipe is corrugated, which is not conducive to the end face heat fusion connection between the two pipes. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an HDPE spiral reinforced drainage pipe and its processing method, so that the HDPE spiral reinforced drainage pipe is easy to be processed into PP and PE composites, and can form a spiral reinforced pipe structure with a flat outer wall, which facilitates the end face heat fusion connection between the two pipes.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] The processing method for HDPE spiral reinforced drainage pipes includes the following steps:

[0007] After the HDPE material is melted, the first winding unit is extruded through an extrusion die. The main cross-sectional shape of the first winding unit is rectangular. A semi-circular groove is provided on the Y-direction side of the rectangle. A protruding part protrudes in the X-direction on the opposite side of the Y-direction of the rectangle. A recessed part is provided in the X-direction on the opposite side of the Y-direction of the rectangle. The recessed part and the protruding part have the same shape.

[0008] The first winding unit is wound on the winding machine and wound. The winding pitch is the X-direction width of the rectangular first winding unit. The concave part of the (n+1)th turn of the first winding unit is connected with the protruding part of the nth turn to form an inner tube. The semi-circular groove on the outer surface of the inner tube forms a spiral groove.

[0009] After the PP material is melted, it is extruded through an extrusion die to form a second winding unit. The cross-sectional shape of the second winding unit is circular.

[0010] The second winding unit is wound into the spiral groove on the outer surface of the inner tube to form a spiral composite layer;

[0011] The first winding unit is wound in reverse around the outside of the second winding unit to form an outer tube. The protrusion of the (n+1)th turn of the outer tube is connected to the recess of the nth turn. The semi-circular groove of the outer tube is connected to the circumferential surface of the second winding unit to form a composite tube. The composite tube is then cooled and shaped.

[0012] The composite pipe is cut into fixed lengths to produce HDPE spiral reinforced drainage pipes.

[0013] Furthermore, in the above-mentioned processing method for HDPE wound reinforced drainage pipe, the cross-section of the second winding unit is annular.

[0014] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, the spiral composite layer and the inner pipe are wound sequentially at intervals of 1-m turns.

[0015] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, m is any integer from 2 to 10.

[0016] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, the outer pipe and the spiral composite layer are wound sequentially at intervals of 1-x turns.

[0017] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, x is any integer from 2 to 10.

[0018] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipes, the cooling and shaping is achieved by water spray cooling zone or air blowing cooling.

[0019] Furthermore, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, the cross-sectional shape of the protrusion is rectangular, and the cross-sectional shape of the recess is rectangular.

[0020] The present invention also protects the HDPE spiral reinforced drainage pipe obtained by the above-described processing method of HDPE spiral reinforced drainage pipe.

[0021] The beneficial effects of this invention are as follows: The HDPE spiral reinforced drainage pipe is composed of a three-layer structure. The inner and outer pipes have the same cross-sectional shape and can use the same extrusion mold. The spiral composite layer is made of PP material, while the inner and outer layers are made of HDPE material. The three layers are spirally wound from the inside to the outside. When the inner pipe is wound, the cooperation of the protrusions and recesses allows the recessed part of the next turn to press against the protrusion of the previous turn, making the structure more stable. The second winding unit of the spiral composite layer is matched and limited by the semi-circular groove on the surface of the inner pipe, which also ensures its winding stability. The outer pipe is limited by the cooperation of the semi-circular groove and the second winding unit, and the stability of the outer pipe is ensured by the protrusion of the next turn pressing against the recess of the previous turn. Through the three-winding process, the spiral composite layer of PP material is composited between the inner and outer pipes. Compared with the traditional co-extrusion method of inner and outer layers, the structure is more stable, and both the inner and outer pipe walls are smooth arc surfaces, which makes it easier to perform hot-melt connection of the pipe ends compared with the corrugated outer wall. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the HDPE spiral reinforced drainage pipe according to a specific embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of part A;

[0024] Label Explanation:

[0025] 1. Inner tube; 11. Main body; 12. Semi-circular groove; 13. Protrusion; 14. Recess;

[0026] 2. Spiral composite layer;

[0027] 3. Outer tube. Detailed Implementation

[0028] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] Please refer to Figure 1 as well as Figure 2 The present invention relates to a processing method for HDPE spiral reinforced drainage pipe, comprising the following steps:

[0030] After the HDPE material is melted, the first winding unit is extruded through an extrusion die. The cross-sectional main body 11 of the first winding unit is rectangular in shape. A semi-circular groove 12 is provided on the Y-direction side of the rectangle. A protruding part 13 protrudes in the X-direction on the opposite side of the Y-direction of the rectangle. A recessed part 14 is recessed in the X-direction on the opposite side of the Y-direction of the rectangle. The recessed part 14 and the protruding part 13 have the same shape.

[0031] The first winding unit is wound on the winding machine and wound. The winding pitch is the X-direction width of the rectangular first winding unit. The recessed part 14 of the (n+1)th turn of the first winding unit is connected with the protruding part 13 of the nth turn to form the inner tube 1. The semi-circular groove 12 on the outer surface of the inner tube 1 forms a spiral groove.

[0032] After the PP material is melted, it is extruded through an extrusion die to form a second winding unit. The cross-sectional shape of the second winding unit is circular.

[0033] The second winding unit is wound into the spiral groove on the outer surface of the inner tube 1 to form a spiral composite layer 2;

[0034] The first winding unit is wound in reverse around the outside of the second winding unit to form an outer tube 3. The protruding part 13 of the (n+1)th turn of the outer tube 3 is connected with the recessed part 14 of the nth turn. The semi-circular groove 12 of the outer tube 3 is connected with the circumferential surface of the second winding unit to form a composite tube. The composite tube is cooled and shaped.

[0035] The composite pipe is cut into fixed lengths to produce HDPE spiral reinforced drainage pipes.

[0036] In the above embodiments, the HDPE spiral reinforced drainage pipe is composed of a three-layer structure. The inner layer pipe 1 and the outer layer pipe 3 have the same cross-sectional shape and can use the same extrusion mold. The spiral composite layer 2 is made of PP material, while the inner and outer layers are both made of HDPE material. The three layers are wound sequentially from the inside to the outside. When the inner layer pipe 1 is wound, the cooperation between the protrusions 13 and the recesses 14 allows the recesses 14 of the next turn to press against the protrusions 13 of the previous turn, making the structure more stable. The second winding unit of the spiral composite layer 2 is connected to the surface of the inner layer pipe 1 by half... The arc groove 12 provides matching and limiting, ensuring the stability of the winding. The outer tube 3 relies on the semi-circular groove 12 and the second winding unit for limiting, and also uses the protrusion 13 of the next turn to press against the recess 14 of the previous turn for winding, ensuring the stability of the outer tube 3. Through the three-winding process, the spiral composite layer 2 of PP material is composited between the inner tube 1 and the outer tube 3. Compared with the traditional co-extrusion method of inner and outer layers, the structure is more stable, and both the inner and outer tube walls are smooth arc surfaces, which makes it easier to perform hot melt connection of the tube ends compared to the corrugated outer wall.

[0037] In a preferred embodiment, the cross-section of the second winding unit is annular.

[0038] In a preferred embodiment, in the above-mentioned processing method for HDPE spiral reinforced drainage pipe, the spiral composite layer 2 and the inner pipe 1 are wound at intervals of 1-m turns.

[0039] In a preferred embodiment, m is any integer from 2 to 10.

[0040] In a preferred embodiment, the outer tube 3 and the spiral composite layer 2 are wound at intervals of 1-x turns.

[0041] In a preferred embodiment, x is any integer from 2 to 10.

[0042] As a preferred embodiment, the cooling system is a water spray cooling zone or air blowing cooling.

[0043] In a preferred embodiment, the protrusion 13 has a rectangular cross-sectional shape, and the recess 14 has a rectangular cross-sectional shape.

[0044] This invention also protects the HDPE spiral reinforced drainage pipe manufactured by the above-described processing method. The above descriptions are merely embodiments of this invention and do not limit the scope of the patent. Any equivalent modifications made based on the description and drawings of this invention, or direct or indirect applications in related technical fields, are similarly included within the scope of patent protection of this invention.

Claims

1. A processing method for HDPE spiral reinforced drainage pipes, characterized in that, Includes the following steps: After the HDPE material is melted, the first winding unit is extruded through an extrusion die. The main cross-sectional shape of the first winding unit is rectangular. A semi-circular groove is provided on the Y-direction side of the rectangle. A protruding part protrudes in the X-direction on the opposite side of the Y-direction of the rectangle. A recessed part is provided in the X-direction on the opposite side of the Y-direction of the rectangle. The recessed part and the protruding part have the same shape. The first winding unit is wound on the winding machine and wound. The winding pitch is the X-direction width of the rectangular first winding unit. The concave part of the (n+1)th turn of the first winding unit is connected with the protruding part of the nth turn to form an inner tube. The semi-circular groove on the outer surface of the inner tube forms a spiral groove. After the PP material is melted, it is extruded through an extrusion die to form a second winding unit. The cross-sectional shape of the second winding unit is circular. The second winding unit is wound into the spiral groove on the outer surface of the inner tube to form a spiral composite layer; The first winding unit is wound in reverse around the outside of the second winding unit to form an outer tube. The protrusion of the (n+1)th turn of the outer tube is connected to the recess of the nth turn. The semi-circular groove of the outer tube is connected to the circumferential surface of the second winding unit to form a composite tube. The composite tube is then cooled and shaped. The composite pipe is cut into fixed lengths to produce HDPE spiral reinforced drainage pipes.

2. The processing method of the HDPE spiral reinforced drainage pipe according to claim 1, characterized in that, The cross-section of the second winding unit is annular.

3. The processing method of the HDPE spiral reinforced drainage pipe according to claim 1, characterized in that, The spiral composite layer and the inner tube are wound at intervals of 1-m turns.

4. The processing method of the HDPE spiral reinforced drainage pipe according to claim 3, characterized in that, m is any integer from 2 to 10.

5. The processing method of the HDPE spiral reinforced drainage pipe according to claim 1, characterized in that, The outer tube and the spiral composite layer are wound at intervals of 1-x turns.

6. The processing method of the HDPE spiral reinforced drainage pipe according to claim 5, characterized in that, x is any integer from 2 to 10.

7. The processing method of the HDPE spiral reinforced drainage pipe according to claim 1, characterized in that, The cooling system is defined as either a water-spray cooling zone or a blower cooling system.

8. The processing method of the HDPE spiral reinforced drainage pipe according to claim 1, characterized in that, The cross-sectional shape of the protrusion is rectangular, and the cross-sectional shape of the recess is rectangular.

9. The HDPE spiral reinforced drainage pipe obtained by the processing method of the HDPE spiral reinforced drainage pipe according to any one of claims 1-8.

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