Manufacturing method of plastic S-shaped supporting rib hollow wall winding reinforced pipe

Abstract

The invention relates to a manufacturing method of a plastic S-shaped supporting rib hollow wall winding reinforced pipe, which comprises the following steps of: a) extruding a continuous plastic sheet by using a first extruder, and then pressing the plastic sheet into a continuous S-shaped supporting rib with an angle; b) extruding a continuous hollow rectangular profile by using a second extruder, arranging a co-extrusion composite die head in the second extruder, extending the S-shaped supporting rib prepared in the step a into the co-extrusion composite die head, and compounding the S-shaped supporting rib with the hollow rectangular profile to prepare a hollow rectangular profile with the plastic S-shaped supporting rib; c) shaping and cooling; d) spirally winding the shaped and cooled sectional materials on a continuously rotating forming roller side by side, so that a gap is formed between two side walls of the adjacent hollow rectangular sectional materials; e) continuously extruding molten plastic sol into the gaps by using a third extruder, so that the two side walls of the adjacent hollow rectangular profiles are tightly fused into a whole; and (f) after cutting, finishing manufacturing.

Description

[Technical field]

[0001] The invention relates to the technical field of wound reinforced pipes, and in particular to a method for manufacturing a plastic S-shaped support rib hollow wall wound reinforced pipe. [Background technology]

[0002] Hollow wall wound reinforced pipes are widely used in municipal sewage pipeline construction due to their good pipe-soil interaction and ring stiffness.

[0003] The hollow wall winding reinforced tube is formed by spiral winding of a hollow rectangular profile. The side walls of adjacent rectangular profiles are spirally wound and welded to form the reinforcement ribs of the hollow wall winding reinforced tube. The ring stiffness of the tube mainly depends on the thickness and width of the rectangular profile, that is, it mainly depends on the thickness of the reinforcement ribs and the spacing between adjacent reinforcement ribs. The increase in the thickness of the rectangular profile will inevitably lead to an increase in the meter weight of the tube; similarly, the smaller the width of the rectangular profile, the higher the ring stiffness, but it will also inevitably lead to an increase in the meter weight of the tube. If the width of the rectangular profile is increased, the hollow section in the tube wall will increase, which greatly reduces the ring stiffness. This is a contradiction and a difficulty that has been difficult to overcome in the field of winding reinforced tubes. [Summary of the invention]

[0004] To solve the above problems, the purpose of the present invention is to provide a method for manufacturing a plastic S-shaped support rib hollow wall wrapped reinforced tube which can increase the width of the rectangular profile, reduce the meter weight and ensure the ring stiffness of the tube.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for manufacturing a plastic S-shaped support rib hollow wall winding reinforced tube, comprising the following steps:

[0006] a) using a first extruder to extrude a continuous plastic sheet, and then using a compression molding machine to press the plastic sheet into a continuous S-shaped support rib with an angle;

[0007] b) using a second extruder to extrude a continuous hollow rectangular profile, wherein a co-extrusion composite die is provided in the second extruder, and the S-shaped support ribs prepared in step a are extended into the co-extrusion composite die to be composited with the hollow rectangular profile, wherein the upper and lower bending surfaces or the two side surfaces of the plastic S-shaped support ribs are respectively welded to the upper and lower ends of the hollow rectangular profile, to obtain a hollow rectangular profile with plastic S-shaped support ribs;

[0008] c) shaping and cooling the above-mentioned hollow rectangular profile with plastic S-shaped supporting ribs;

[0009] d) The hollow rectangular profiles with plastic S-shaped support ribs after shaping and cooling are spirally wound side by side on a continuously rotating forming roller to form a gap between the two side walls of adjacent hollow rectangular profiles;

[0010] e) continuously extruding molten plastic sol into the gap described in step d by a third extruder, so that the two side walls of the adjacent hollow rectangular profiles are tightly fused into one, and a reinforcing rib of the hollow wall winding reinforcement tube is formed;

[0011] f) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

[0012] The manufacturing method of the hollow wall wrapped reinforced tube with plastic S-shaped support ribs in the present invention is further configured as follows: in the step b, an upper positioning groove is provided at the upper end of a continuous hollow rectangular profile extruded by a second extruder, and a lower positioning groove is provided at the lower end of the rectangular profile, the widths of the upper positioning groove and the lower positioning groove match the width of the plastic S-shaped support ribs, and the upper positioning groove, the lower positioning groove and the plastic S-shaped support ribs are welded into one.

[0013] The manufacturing method of the hollow wall wrapped reinforced tube of the plastic S-shaped support rib in the present invention is further configured as follows: in the step a, when the plastic sheet is press-formed by the press-forming machine, a through hole parallel to the rib body is provided in the side wall of the plastic S-shaped support rib.

[0014] The manufacturing method of the hollow wall wrapped reinforced tube with plastic S-shaped support ribs in the present invention is further configured as follows: in the step a, when the plastic sheet is press-formed by the press-forming machine, side holes are provided in the plate surface of the plastic S-shaped support ribs.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the manufacturing method of the above-mentioned plastic S-shaped support rib hollow wall winding reinforced tube can be produced by using ordinary winding structure wall pipe production equipment equipped with a suitable die head, a shaping sleeve and an auxiliary pressing wheel, and the equipment investment is small. The obtained plastic S-shaped support rib hollow wall winding reinforced tube has the following advantages:

[0016] 1. Plastic S-shaped support ribs are arranged in the middle of the rectangular profile, so that the width of the rectangular profile can be increased by at least one time, that is, the plastic S-shaped support ribs are used to replace part of the reinforcing ribs in the original hollow wall winding reinforced tube. Compared with the reinforcing ribs in the original hollow wall winding reinforced tube, the plastic S-shaped support ribs of the same width can not only ensure the ring stiffness, but also greatly reduce the required materials, so that the meter weight of the tube is greatly reduced.

[0017] 2. The plastic S-shaped support ribs are formed first, so that the bending angle and height can be determined according to the ring stiffness required for the winding reinforcement tube, that is, the width and height of the plastic S-shaped support ribs after bending are determined, so as to ensure the ring stiffness of the winding reinforcement tube. The plastic S-shaped support ribs are co-extruded and composited with the body, which is not only conducive to heat dissipation, but also can greatly improve the extrusion production speed.

[0018] 3. The upper and lower ends of the middle of the rectangular profile are respectively provided with an upper positioning groove and a lower positioning groove. When the rectangular profile and the plastic S-shaped support rib are made of the same material, the two can be stably fused. Even when the rectangular profile and the plastic S-shaped support rib are made of different materials, the upper and lower positioning grooves can ensure that the two can be reliably connected.

[0019] 4. The plastic S-shaped support ribs are provided with through holes parallel to the rib body, so that the weight per meter of the plastic S-shaped support ribs per unit length is reduced, thereby reducing the weight per meter of the wound reinforcement pipe.

[0020] 5. The continuous waves formed by the plastic S-shaped support ribs after bending form a triangular support force; the support strength increases with the increase of the bending angle, which is 2 to 3 times the original plate with the same thickness; since the plastic S-shaped support rib is a continuous wave, it can bend and extend without affecting the ring stiffness of the pipe during the bending and winding process, reducing the loss of ring stiffness of the entire pipe due to the collapse of the support ribs due to excessive yield force during spiral winding; after practice, the ring stiffness of the hollow wall winding reinforced pipe of the plastic S-shaped support rib is 1.5 to 2 times higher than that of the hollow wall winding reinforced pipe currently used; and the raw materials are saved by 13%, making a contribution to society.

Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the process of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the S-shaped support rib;

[0023] Figure 3 It is another structural diagram of the S-shaped support rib;

[0024] Figure 4 It is another structural diagram of the S-shaped support rib;

[0025] Figure 5 is a schematic diagram of the structure of the produced pipe;

[0026] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure in the AA direction;

[0027] Figure 7 yes Figure 5 A schematic cross-sectional view of another embodiment in the AA direction;

[0028] Figure 8 yes Figure 5 A schematic diagram of the enlarged structure of the middle B part;

[0029] In the figure: 1, rectangular profile, 2, reinforcing ribs, 3, S-shaped supporting ribs, 31, bending surface, 32, side surface, 4, upper positioning groove, 5, lower positioning groove, 6, through hole, 7, side hole. [Specific implementation method]

[0030] The following is a further detailed description of the method for manufacturing the plastic S-shaped support rib hollow wall winding reinforcement tube of the present invention through specific embodiments.

[0031] like Figure 1 As shown, the manufacturing method of the plastic S-shaped support rib hollow wall winding reinforcement tube comprises the following steps:

[0032] a) Using a first extruder to extrude a continuous plastic sheet, and then using a pressing machine to press the plastic sheet into a continuous S-shaped support rib 3 with an angle; wherein the structure of the S-shaped support rib 3 is as follows: Figure 2 , Figure 3 , Figure 4 As shown, Figure 3 When the plastic sheet is pressed and formed by the pressing machine, a through hole 6 parallel to the rib body is provided in the side wall of the plastic S-shaped support rib 3. The through hole 6 reduces the weight per meter of the plastic S-shaped support rib 3 per unit length, thereby reducing the weight per meter of the winding reinforcement tube. As another embodiment of the present application, Figure 4 As shown, a side hole 7 is provided in the side surface 31 of the plastic S-shaped support rib 3. The side hole 7 can also reduce the weight per meter of the plastic S-shaped support rib 3 per unit length, thereby reducing the weight per meter of the corrugated pipe.

[0033] b) using a second extruder to extrude a continuous hollow rectangular profile, wherein a co-extrusion composite die is provided in the second extruder, and the S-shaped support rib 3 prepared in step a is extended into the co-extrusion composite die to be composited with the hollow rectangular profile 1, wherein the upper and lower bending surfaces 31 or the two side surfaces 32 of the plastic S-shaped support rib 3 are respectively welded to the upper and lower ends of the hollow rectangular profile 1, so as to obtain the hollow rectangular profile 1 with the plastic S-shaped support rib 3; Figure 5 , Figure 6 As shown in FIG. 1 , the upper and lower bending surfaces 31 of the plastic S-shaped supporting rib 3 are respectively connected to the upper and lower ends of the rectangular profile 1, as shown in FIG. Figure 7 As shown, it is an embodiment in which the two side surfaces 32 of the plastic S-shaped supporting rib 3 are respectively connected to the upper and lower ends of the rectangular profile 1.

[0034] c) shaping and cooling the hollow rectangular profile 1 with the plastic S-shaped supporting ribs 3;

[0035] d) Using a traction machine, the hollow rectangular profiles 1 with plastic S-shaped support ribs 3 after shaping and cooling are spirally wound side by side on a continuously rotating forming drum, so that gaps are formed between the two side walls of adjacent hollow rectangular profiles 1;

[0036] e) continuously extruding the molten plastic sol into the gap described in step d by a third extruder, so that the two side walls of the adjacent hollow rectangular profiles 1 are tightly fused into one, and the reinforcing ribs 2 of the hollow wall-wrapped reinforced tube are formed; the obtained tube is as follows Figure 4 , Figure 7 shown.

[0037] f) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

[0038] As a preferred embodiment, in step b, Figure 8 As shown, the upper end of the hollow rectangular profile 1 extruded continuously by the second extruder is provided with an upper positioning groove 4, and the lower end of the rectangular profile is provided with a lower positioning groove 5. The widths of the upper positioning groove 4 and the lower positioning groove 5 match the widths of the plastic S-shaped support rib 3, and the upper positioning groove 4 and the lower positioning groove 5 are fused together with the plastic S-shaped support rib 3. When the rectangular profile 1 and the plastic S-shaped support rib 3 are made of the same material, the two can be stably fused. Even when the rectangular profile 1 and the plastic S-shaped support rib 3 are made of different materials, the presence of the upper positioning groove 4 and the lower positioning groove 5 can ensure that the two can be reliably connected.

[0039] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A method for manufacturing a plastic S-shaped support rib hollow wall winding reinforced tube, characterized in that: The following steps are involved: a) using a first extruder to extrude a continuous plastic sheet, and then using a compression molding machine to press the plastic sheet into a continuous S-shaped support rib with an angle; b) using a second extruder to extrude a continuous hollow rectangular profile, wherein a co-extrusion composite die is provided in the second extruder, and the S-shaped support ribs prepared in step a are extended into the co-extrusion composite die to be composited with the hollow rectangular profile, wherein the upper and lower bending surfaces or the two side surfaces of the plastic S-shaped support ribs are respectively welded to the upper and lower ends of the hollow rectangular profile, to obtain a hollow rectangular profile with plastic S-shaped support ribs; c) shaping and cooling the above-mentioned hollow rectangular profile with plastic S-shaped supporting ribs; d) The hollow rectangular profiles with plastic S-shaped support ribs after shaping and cooling are spirally wound side by side on a continuously rotating forming roller to form a gap between the two side walls of adjacent hollow rectangular profiles; e) continuously extruding molten plastic sol into the gap described in step d by a third extruder, so that the two side walls of the adjacent hollow rectangular profiles are tightly fused into one, and a reinforcing rib of the hollow wall winding reinforcement tube is formed; f) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

2. The method for manufacturing the plastic S-shaped support rib hollow wall winding reinforced tube according to claim 1, characterized in that: In the step b, an upper positioning groove is provided at the upper end of a continuous hollow rectangular profile extruded by a second extruder, and a lower positioning groove is provided at the lower end of the rectangular profile. The widths of the upper positioning groove and the lower positioning groove match the width of the plastic S-shaped supporting rib, and the upper positioning groove, the lower positioning groove and the plastic S-shaped supporting rib are fused into one.

3. The method for manufacturing the plastic S-shaped support rib hollow wall winding reinforced tube according to claim 1 or 2, characterized in that: In the step a, when the plastic sheet is pressed and formed by a pressing machine, a through hole parallel to the rib body is provided in the side wall of the plastic S-shaped supporting rib.

4. The method for manufacturing the plastic S-shaped support rib hollow wall winding reinforced tube according to claim 1 or 2, characterized in that: In the step a, when the plastic sheet is pressed and formed by the pressing machine, side holes are provided in the plate surface of the plastic S-shaped supporting ribs.

Images