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

Abstract

The invention relates to a manufacturing method of a plastic S-shaped supporting rib winding reinforced corrugated 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 an angled continuous S-shaped supporting rib by using a pressing forming machine; and b) extruding a continuous plastic corrugated 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 to be compounded with the plastic corrugated profile, and welding the upper and lower bending surfaces of the plastic S-shaped supporting rib with the upper and lower ends of the plastic corrugated profile to obtain the plastic corrugated profile. The plastic corrugated profile with the plastic S-shaped supporting ribs is manufactured; c) shaping and cooling; d) spirally winding a strip-shaped base band on a continuously rotating forming roller and welding to form a pipe body, and simultaneously fusing, winding and compounding the middle part of the plastic corrugated profile and the joint of the pipe body in a thermal state; and e) cutting to finish manufacturing.

Description

[Technical field]

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

[0002] The Chinese patent number is ZL 201220119995.X, and the name is a strip and an inner rib reinforced spirally wound pipe prepared therefrom. The patent discloses a strip, including a panel, an arc-shaped body and vertical ribs. The arc-shaped body is located outside the panel and forms a cavity between the panel and the arc-shaped body. The vertical ribs are located in the cavity between the arc-shaped body and the panel and divide the cavity into two. The two sides of the panel are overlapped parts. The panel, the arc-shaped body and the vertical ribs in the strip are formed by one-time extrusion. The pipe body is a tubular body formed by winding and melting welding the strip. The arc-shaped body forms an outer corrugated shape on the outside of the pipe body, and pipe joints are plastic-welded at both ends of the pipe body.

[0003] The above-mentioned strip and the inner rib reinforced spirally wound pipe prepared therefrom have the following defects:

[0004] 1. Since the extrusion molding is a strip with hollow and overlapping edges, the heat in the hollow cavity cannot be released when the strip is produced. In addition, the overlapping parts and vertical ribs on both sides need to be formed, so the production speed of this strip will be very slow and the real benefit cannot be achieved.

[0005] 2. Since the strip is preformed first, and then the two sides of the cold strip are overlapped and welded into a pipe, the overlap of the pipe is the weakest part and is exposed to the outside of the pipe. It is greatly affected by changes in climate temperature, transportation and installation. The tensile strength of the overlap is insufficient and it is easy to break, and the corrugation is spring-shaped.

[0006] 3. The ring stiffness of the pipe mainly depends on the thickness of the vertical reinforcement. The increase in the thickness of the vertical reinforcement will inevitably lead to an increase in the weight per meter of the pipe. This is a contradiction and a difficulty that has been difficult to overcome in the field of winding corrugated pipes.

[0007] The Chinese patent number is: 201110121186.2, and the patent named "Inner rib reinforced outer corrugated plastic wound structural wall pipe and its manufacturing method" discloses an inner rib reinforced corrugated plastic wound structural wall pipe, which is formed by spirally winding plastic special-shaped strips with tubular protrusions containing hollow cavities on both sides and fused by melt glue to form a pipe body, and two hollow cavities close to each other between adjacent plastic special-shaped strips wound in a spiral manner are fused to form hollow reinforcement ribs, and upright reinforcement inner ribs are formed at the fusion position in the middle of the hollow reinforcement ribs. The pipe body includes a cylindrical pipe wall, a hollow reinforcement rib spirally wrapped thereon, and a reinforcement inner rib located in the hollow reinforcement rib and perpendicular to the pipe wall. The reinforcement inner rib divides the hollow reinforcement rib into two parallel hollow cavities, and the fusion bonding surface is located at the reinforcement inner rib. The pipe is formed by spirally winding plastic profiled strips with tubular protrusions containing hollow cavities on both sides and fused with melt glue. Two hollow cavities close to each other between adjacent plastic profiled strips wound in a spiral manner are fused to form hollow reinforcement ribs, and upright reinforcing inner ribs are formed at the fusion position in the middle of the hollow reinforcement ribs.

[0008] The above-mentioned inner rib reinforced outer corrugated plastic winding structure wall pipe and its manufacturing method have the following defects:

[0009] 1. The welding surface is the entire circumferential section, which reduces the ring stiffness of the structural wall pipe. If the process is improperly controlled, it is easy to cause the pipe to have insufficient tensile strength, break easily, and the corrugation to be spring-shaped.

[0010] 2. There are differences between the materials of the melt adhesive and the materials of the pipe. The difference in tensile strength between the two materials will lead to a decrease in hot melt strength and affect the annular flexibility of the structural wall pipe.

[0011] 3. The reinforced inner ribs are formed by fusion of molten glue, which results in that the width of the reinforced inner ribs cannot be uniform, that is, the ring stiffness of the entire structural wall pipe cannot be guaranteed, and the meter weight of the pipe increases. [Summary of the invention]

[0012] In order to solve the above problems, the purpose of the present invention is to provide a method for manufacturing a plastic S-shaped support rib wrapped reinforced corrugated pipe. The prepared wrapped reinforced corrugated pipe is a pipe with high ring stiffness, wear resistance, fracture resistance, and easy manufacturing. The drainage pipe manufactured using it has a stable structure, high ring stiffness, and light weight per meter, and is suitable for the production of larger diameter pipes.

[0013] To achieve the above object, the technical solution adopted by the present invention is: a method for manufacturing a plastic S-shaped support rib-wrapped reinforced corrugated pipe, comprising the following steps:

[0014] 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;

[0015] b) using a second extruder to extrude a continuous plastic corrugated 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 plastic corrugated profile, wherein the upper and lower bending surfaces of the plastic S-shaped support ribs are welded to the upper and lower ends of the plastic corrugated profile to obtain a plastic corrugated profile with plastic S-shaped support ribs;

[0016] c) shaping and cooling the plastic corrugated profile with the plastic S-shaped supporting ribs;

[0017] d) spirally winding the long strip of base tape on a continuously rotating forming roller and welding it to form a tube body, and at the same time, hot-melting and winding the middle part of the plastic corrugated profile with plastic S-shaped supporting ribs with the connecting part of the tube body, so that the plastic corrugated profile with plastic S-shaped supporting ribs forms an outer corrugated shape on the outside of the tube body;

[0018] e) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

[0019] The manufacturing method of the plastic S-shaped support rib wrapped reinforced corrugated pipe 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 plastic S-shaped support rib.

[0020] 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 wound reinforced corrugated pipe 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 wound reinforced corrugated pipe has the following advantages:

[0021] 1. The plastic S-shaped support ribs are formed first, so that the bending angle and height can be determined according to the required ring stiffness of the corrugated pipe, 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 corrugated pipe. 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.

[0022] 2. The upper and lower ends of the plastic corrugated profile are respectively provided with an upper positioning groove and a lower positioning groove. When the plastic corrugated profile and the plastic S-shaped supporting rib are made of the same material, the two can be stably fused. Even when the plastic corrugated profile and the plastic S-shaped supporting rib are made of different materials, the upper and lower positioning grooves can ensure that the two can be reliably connected, thereby effectively preventing the plastic corrugated profile from collapsing due to torsion during spiral winding.

[0023] 3. The middle part of the bottom of the plastic corrugated profile is thermally fused and entangled with the connection of the plastic sheet, thereby effectively thermally compounding with the weak part of the corrugated pipe, greatly improving the strength and axial pulling force of the corrugated pipe.

[0024] 4. The plastic S-shaped support ribs are provided with through holes parallel to the rib body or side holes located in the plate surface, so that the meter weight of the plastic S-shaped support ribs per unit length is reduced, thereby reducing the meter weight of the corrugated pipe.

[0025] 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; because 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 plastic S-shaped support rib wrapped reinforced corrugated pipe has an annular stiffness of 1.5 to 2 times that of the currently used wrapped corrugated pipe of the same caliber; and under the premise of the same caliber pipe and the same annular stiffness, the same raw materials can be saved by 13-30%, making a contribution to society.

Brief Description of the Drawings

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the pipe produced by the present invention.

[0028] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0029] Figure 4 yes Figure 2 A schematic diagram of the enlarged structure of the middle B part;

[0030] Figure 5 It is a schematic diagram of the structure of the plastic S-shaped support rib in the present invention;

[0031] Figure 6 It is another structural schematic diagram of the plastic S-shaped supporting rib in the present invention;

[0032] Figure 7 It is another structural schematic diagram of the plastic S-shaped supporting rib in the present invention;

[0033] In the figure: 1. tube body, 2. plastic corrugated profile, 3. S-shaped supporting ribs, 31. bending surface, 32. side surface, 4. through hole, 5. upper positioning groove, 6. lower positioning groove, 7. side hole. [Specific implementation method]

[0034] The following is a further detailed description of the method for manufacturing the plastic S-shaped support rib-wrapped reinforced corrugated pipe of the present invention through specific embodiments.

[0035] like Figure 1 As shown, the manufacturing method of the plastic S-shaped support rib winding reinforced corrugated pipe comprises the following steps:

[0036] a) A continuous plastic sheet is extruded by a first extruder, and then a pressing machine is used to press the plastic sheet into a continuous S-shaped support rib 3 with an angle; the structure of the obtained S-shaped support rib 3 is as follows: Figure 5 , Figure 6 , Figure 7 As shown, Figure 6 As shown, when the plastic sheet is pressed and formed by the pressing machine, a through hole 4 parallel to the rib body is provided in the plastic S-shaped support rib 3. The through hole 4 reduces 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. As another embodiment of the present application, Figure 7 As shown, a side hole 7 is provided in the side surface 32 of the plastic S-shaped support rib 4. The side hole 7 can also reduce the weight per meter of the plastic S-shaped support rib 4 per unit length, thereby reducing the weight per meter of the corrugated pipe.

[0037] b) using a second extruder to extrude a continuous plastic corrugated profile 2, 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 plastic corrugated profile 2, such as Figure 2 , Figure 3 , Figure 4 As shown, the upper and lower bending surfaces 31 of the plastic S-shaped supporting ribs 3 are welded to the upper and lower ends of the plastic corrugated profile 2 to obtain the plastic corrugated profile 2 with the plastic S-shaped supporting ribs 3.

[0038] c) shaping and cooling the plastic corrugated profile 2 with the plastic S-shaped supporting ribs 3;

[0039] d) spirally wrap the long strip of base tape on the continuously rotating forming roller and weld it to form the tube body 1, and at the same time, heat-melt and wrap the middle part of the plastic corrugated profile 2 with the plastic S-shaped supporting ribs 3 with the connection part of the tube body 1, so as to effectively heat-combine with the weak part of the corrugated tube, greatly improving the strength and axial pulling force of the corrugated tube. The plastic corrugated profile 2 with the plastic S-shaped supporting ribs 3 forms an outer corrugated shape on the outside of the tube body 1; the obtained tube is as follows: Figure 2 , Figure 3 , Figure 4 shown.

[0040] e) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

[0041] As a preferred embodiment, in step b, Figure 4 As shown, the upper end of the continuous plastic corrugated profile 2 extruded by the second extruder is provided with an upper positioning groove 5, and the lower end of the plastic corrugated profile 2 is provided with a lower positioning groove 6. The widths of the upper positioning groove 5 and the lower positioning groove 6 match the widths of the plastic S-shaped support ribs 3, and the upper positioning groove 5 and the lower positioning groove 6 are fused together with the plastic S-shaped support ribs 3. When the plastic corrugated profile 2 and the plastic S-shaped support ribs 3 are made of the same material, the two can be stably fused. Even when the plastic corrugated profile 2 and the plastic S-shaped support ribs 3 are made of different materials, the presence of the upper positioning groove 5 and the lower positioning groove 6 can ensure that the two can be reliably connected, thereby effectively preventing the plastic corrugated profile 2 from collapsing due to torsion during spiral winding.

[0042] 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-wrapped reinforced corrugated pipe, 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 plastic corrugated 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 plastic corrugated profile, wherein the upper and lower bending surfaces of the plastic S-shaped support ribs are welded to the upper and lower ends of the plastic corrugated profile to obtain a plastic corrugated profile with plastic S-shaped support ribs; c) shaping and cooling the plastic corrugated profile with the plastic S-shaped supporting ribs; d) spirally winding the long strip of base tape on a continuously rotating forming roller and welding it to form a tube body, and at the same time, hot-melting and winding the middle part of the plastic corrugated profile with plastic S-shaped supporting ribs with the connecting part of the tube body, so that the plastic corrugated profile with plastic S-shaped supporting ribs forms an outer corrugated shape on the outside of the tube body; e) After the finished pipe is cut into the required length by a cutting machine, the production is completed.

2. The method for manufacturing a plastic S-shaped support rib-wrapped reinforced corrugated pipe according to claim 1, characterized in that: In the step a, when the plastic sheet is pressed and formed by the pressing machine, through holes parallel to the rib body are provided in the plastic S-shaped supporting ribs.

3. The method for manufacturing a plastic S-shaped support rib-wrapped reinforced corrugated pipe according to claim 1, 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.

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