A method and equipment for winding and forming a large-diameter polymer pipeline buckle

Abstract

The present invention discloses a method and equipment for forming a large-diameter polymer pipe by buckle winding. The method is to first extrude a blank from a polymer material through a profile die by using a first extruder. The cross-section of the blank includes a buckle structure. The blank is wound around a core film assembly in a spiral manner, and the buckles of adjacent turns of the blank are engaged and overlapped. A shaping roller presses the wound blank tightly on the core film assembly for shaping, and a limiting baffle lining makes the blank wind in a spiral manner and enables the completed pipe to extend axially along the core film assembly. The equipment includes an extrusion device and a buckle winding device connected to each other. The extrusion device includes a first extruder and a profile die. The discharge port of the first extruder is connected to the profile die. The buckle winding device includes a core film assembly in the shape of a drum, a shaping roller, and a limiting baffle lining. The core film assembly is also connected to a motor for driving rotation. The shaping rollers are distributed on the circumference of the core film assembly and press the wound blank tightly. The spiral limiting baffle lining is located on one side of the core film assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer material processing, and particularly relates to a method and device for forming a large-diameter polymer pipe by snap winding. Background Art

[0002] The application of large-diameter plastic pipes is becoming more and more extensive. Compared with traditional pipes such as metal pipes, plastic pipes have the advantages of corrosion resistance, easy installation, energy saving, small fluid friction resistance, sanitation and environmental protection, light weight, low transportation and maintenance costs, and recyclability. In addition, compared with traditional pipes, plastic pipes also have good toughness, impact resistance, and excellent earthquake resistance, which is particularly important for earthquake-prone areas. Based on these advantages, large-diameter plastic pipes have been widely used in many fields such as rescue and escape, gas transportation, liquid transportation, solid transportation, sewage discharge, and drainage.

[0003] The so-called large-diameter plastic pipe generally refers to a pipe with an outer diameter greater than 315 mm for PE pipes and an outer diameter greater than 500 mm for other materials. At present, the forming process methods of plastic pipes, especially large-diameter pipes, mainly include extrusion molding and winding and welding molding. Extrusion molding is relatively difficult in forming large-diameter pipes, and there are problems such as poor mechanical properties, high cost, and poor flexibility. The invention application with the publication number CN107775924A discloses a large pipe extrusion molding device, but this method cannot form pipes with a larger diameter and requires frequent die changes, so this forming method has the disadvantages of complex process, poor flexibility, and high energy consumption. The winding molding method has a high cost, and the pipe has certain mechanical properties, but there are many deficiencies: the molding process is complex, the energy-saving effect is poor, and the pipe strength is low. The KraussMaffei company in Germany and the invention application with the publication number CN101380819A disclose a method for winding and welding large-diameter pipes, but this method requires pre-forming small-diameter pipes. When forming, the small-diameter pipes are first coated with plastic melt and then wound onto a mandrel. Special mandrel dies are required for winding molding, and the mandrel dies need to be replaced when forming pipes of each diameter. At the same time, secondary heating equipment is required during molding. In addition, there are welding marks between the melt strips and the small-diameter pipes during molding. Therefore, this forming method has the disadvantages of complex winding process, poor flexibility, high energy consumption, high consumables, large flow resistance, easy leakage, and low pressure resistance. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for forming a large-diameter polymer pipe by snap winding. This method extrudes a profiled blank with a snap structure and winds and forms the pipe in a spiral manner, which can be continuously formed and has good adaptability.

[0005] Another purpose of the present invention is to provide a large-diameter polymer pipe snap winding forming device for realizing the above method.

[0006] The technical solution of the present invention is as follows: A method for forming a large-diameter polymer pipe by buckle winding. First, a polymer material is extruded into a blank through a profile die by a first extruder. The cross-section of the blank includes a buckle structure. The blank is wound around a core film assembly in a spiral manner, and the buckles of adjacent turns of the blank are engaged and overlapped. A shaping roller presses the wound blank tightly on the core film assembly for shaping. A limiting and material-blocking lining plate is provided at the end of the core film assembly. The limiting and material-blocking lining plate enables the blank to be wound in a spiral manner and makes the wound pipe extend along the axial direction of the core film assembly, thereby realizing the continuous forming of a large-diameter pipe. Among them, the core film assembly adopts active drive, and the buckle structure enables the newly wound blank to be engaged and overlapped with the previous turn of the blank, and the blank is wound on the core film assembly and seamless overlap is carried out.

[0007] A roller is provided above the core film assembly. The extruded blank first completes the overlap of the buckles under the action of the roller, and the shaping roller further compacts and shapes. The core film assembly includes a drum-shaped core film body and damping rods. Wedge-shaped grooves with a cross-section are evenly distributed on the circumferential wall of the core film body. The damping rods are limited in the grooves of the core film body, and the outermost edge of the damping rods is higher than the outermost edge of the core film body. When the blank is wound on the core film assembly, the damping rods roll outwards to tightly support the wound pipe.

[0008] The polymer material of the formed pipe adopts ultra-high molecular weight polyethylene, high-density polyethylene or polyvinyl chloride.

[0009] A large-diameter polymer pipe buckle winding forming device includes a connected extrusion device and a buckle winding device. The extrusion device includes a first extruder and a profile die. The discharge port of the first extruder is connected to the profile die. The cross-section of the blank formed by the profile die includes a buckle structure. The buckle winding device includes a drum-shaped core film assembly, a shaping roller and a limiting and material-blocking lining plate. The core film assembly is also connected to a motor for driving rotation. The shaping rollers are distributed on the circumference of the core film assembly and press the wound blank tightly. The spiral-shaped limiting and material-blocking lining plate is located at one end of the core film assembly. Among them, the profile die is located at the discharge end of the first extruder. The extruder feeds the blank to the buckle winding device. The blank extruded by the profile die is wound on the core film assembly. The newly wound blank makes the wound pipe extend along the axial direction of the core film assembly under the action of the limiting and material-blocking lining plate, realizing the continuous forming of a large-diameter pipe.

[0010] The cross-section of the blank formed by the profile die includes two buckle structures. The two buckle structures are centrosymmetric, and the middle part of the cross-section is a hollow or solid structure. The buckle is a structure with both ends bent. With this structure, when the blank is wound on the core film assembly, the buckle of the newly wound blank can overlap with the buckle of the previous turn of the blank, and then be pressed tightly by the shaping roller to ensure seamless splicing of the pipe. The middle part of the cross-section is a hollow or solid structure. When overlapping, one end of a buckle falls into the bent part of another buckle to achieve tight fitting.

[0011] The buckle winding device further includes a support disk and a limit bolt. The support disk is located at one end of the core film assembly, and the shaping pressure roller is installed on the support disk. There are 5 to 9 shaping pressure rollers, and the limit material retaining liner is fixed to the support disk by a plurality of limit bolts. Among them, when the core film assembly rotates, the shaping pressure roller rolls and presses the blank to shape the pipe; the limit bolts are evenly distributed on the circumference of the support plate, and the protruding lengths of adjacent limit bolts change evenly, so that the limit material retaining liner changes spirally on the support plate. Along the rotation direction of the core film assembly, the protruding length of the limit bolt gradually increases. The distance between adjacent shaping pressure rollers is the same.

[0012] The core film assembly includes a core film body, core film end caps, damping rods, and a core film drive shaft. The circumferential wall of the core film body is evenly provided with grooves with a wedge-shaped cross-section. The core film end caps are arranged at both ends of the core film body. The damping rods are limited in the grooves of the core film body by the core film end caps. The core film drive shaft is located at the axis of the core film body and is connected to the motor. Among them, the length direction of the groove is parallel to the axis of the core film body, and the directions of the cross-sections of the grooves are the same. When the blank is wound around the core film body, the core film body rotates driven by the motor, and the damping rods in the grooves are forced to roll towards the tip of the wedge. The outer edge of the damping rod is higher than the outer edge circumference of the core film body and the exceeding height gradually increases, so as to tighten the wound pipe.

[0013] The outermost edge of the damping rod exceeds the outer edge circumference of the core film body, and the number of grooves and damping rods is the same, and the grooves and damping rods correspond one by one. Among them, the damping rod can roll in the groove, and there are multiple groups of grooves and damping rods to cooperate to tighten the wound pipe.

[0014] The buckle winding device further includes a guide roller and a rolling roller. The blank extruded by the profiled bar die is wound around the core film assembly in a spiral manner through the guide roller and the rolling roller. Among them, the guide roller is used to adjust the direction and position of the blank, and the rolling roller is located above the core film assembly, pressing the newly extruded blank on the core film body to make the buckle of the newly extruded blank engage and overlap with the buckle of the previous turn of the blank, which is convenient for the shaping pressure roller to further compact and shape. The blank passing through the rolling roller and the shaping pressure roller in sequence can ensure tight winding.

[0015] The extrusion device further includes a second extruder, and the second extruder extrudes an adhesive, and the adhesive bonds the overlapping gap between the buckle of the newly wound blank and the buckle of the previous turn of the blank. With this structure, the adjacent turns of the blank can be more tightly overlapped and bonded, ensuring the quality of the pipe.

[0016] The present invention has the following beneficial effects compared with the prior art:

[0017] 1. The method of forming a large-diameter plastic pipe by spiral buckle winding can realize the continuous forming of a large-diameter pipe without a large mold only by relying on a small profiled bar die.

[0018] 2. It has changed the existing winding forming method and equipment for large-diameter polymer material pipelines, and different diameters and wall thicknesses can be formed at the key positions of parts by adjusting on the same equipment.

[0019] 3. The winding forming method and equipment for large-diameter polymer material pipelines of the present invention have simple structures, are easy to disassemble and assemble, have low costs and high performance, can form large-diameter pipes of various polymer materials, and have a wide range of applications. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the buckling winding forming equipment for large-diameter polymer pipelines of the present invention.

[0021] Figure 2 It is a partially enlarged schematic diagram of the core film assembly.

[0022] Figure 3 It is a schematic structural diagram of the limit baffle lining plate.

[0023] Figure 4a It is a schematic structural diagram of the cross-section of the blank in Embodiment 1 where the buckles are not overlapped.

[0024] Figure 4b It is a schematic structural diagram of the cross-section of the blank in Embodiment 1 after the buckles are overlapped.

[0025] Figure 5 It is a schematic structural diagram of the buckling winding forming equipment for large-diameter polymer pipelines in Embodiment 2.

[0026] Figure 6 It is a partially enlarged schematic diagram of the blank winding in the buckling winding device in Embodiment 2.

[0027] Figure 7a It is a schematic structural diagram of the cross-section of the blank in Embodiment 3 where the buckles are not overlapped.

[0028] Figure 7b It is a schematic structural diagram of the cross-section of the blank in Embodiment 3 after the buckles are overlapped.

[0029] As shown in the figure, 1 is the first extruder, 2 is the profile die, 3 is the blank, 4 is the guide roller, 5 is the rolling roller, 6 is the support disk, 7 is the core film assembly, 7-1 is the core film body, 7-2 is the damping rod, 7-3 is the groove, 8 is the shaping pressure roller, 9 is the pipeline, 10 is the limit bolt, 11 is the second extruder, 12 is the binder, 13 is the limit baffle lining plate, Ⅰ is the extrusion device, and Ⅱ is the buckling winding device. Detailed Embodiments

[0030] The present invention will be further described in detail below in conjunction with the embodiments, but the embodiments of the present invention are not limited thereto.

[0031] Embodiment 1

[0032] In this embodiment, a large-diameter polymer pipe buckle winding forming device, as Figure 1 shown, includes an extrusion device I and a buckle winding device II which are connected. The extrusion device includes a first extruder 1 and a profile die 2. The discharge port of the first extruder is connected to the profile die by a flange with screws. The cross-section of the blank 3 formed by the profile die includes a buckle structure. The buckle winding device includes a core film assembly 7 in the shape of a drum, a shaping pressure roller 8, and a limiting baffle lining plate 13. The core film assembly is also connected to a motor for driving rotation. The shaping pressure rollers are distributed on the circumference of the core film assembly and press the blank wound on the core film assembly. The spiral limiting baffle lining plate is located at one end of the core film assembly. Among them, the profile die is located at the discharge end of the first extruder. The extruder feeds the blank to the buckle winding device. The buckle winding device is located below the discharge port of the profile die. The blank extruded by the profile die is wound on the core film assembly. The newly wound blank makes the completed pipeline 9 extend axially along the core film assembly under the action of the limiting baffle lining plate, realizing the continuous forming of large-diameter pipelines.

[0033] As shown in Figure 4, the cross-section of the blank formed by the profile die includes two buckle structures, and the two buckle structures are centrosymmetric. The middle part of the blank cross-section is a hollow structure, and the buckle is a bent structure at both ends. With this structure, when the blank is wound on the core film assembly, the buckle of the newly wound blank can overlap with the buckle of the previous circle of blank, and then be pressed tightly by the shaping pressure roller to ensure seamless splicing of the pipeline; during overlapping, one end of a buckle falls into the bent part of another buckle to achieve tight fitting. A convex strip and a groove that match each other can be arranged on the inner side of the bent part of the buckle to achieve a more tightly and stably overlapping.

[0034] As Figure 3 shown, the buckle winding device also includes a support disk 6 and limiting bolts 10. The support disk is located at one end of the core film assembly. The shaping pressure rollers are installed on the support disk. There are 7 shaping pressure rollers. The limiting baffle lining plate is fixed on the support disk by a plurality of limiting bolts. Among them, when the core film assembly rotates, the shaping pressure rollers roll and press the blank to shape the pipe; the limiting bolts are evenly distributed on the circumference of the support plate, and the protruding lengths of adjacent limiting bolts change evenly, so that the limiting baffle lining plate changes spirally on the support plate. Along the rotation direction of the core film assembly, the protruding length of the limiting bolt gradually becomes larger. The distance between adjacent shaping pressure rollers is the same.

[0035] As Figure 2As shown, the core film assembly includes a core film body 7-1, core film end caps, damping rods 7-2, and a core film drive shaft. The circumferential wall of the core film body is evenly distributed with grooves 7-3 having a wedge-shaped cross-section. The core film end caps are provided at both ends of the core film body. The damping rods are limited in the grooves of the core film body by the core film end caps. The core film drive shaft is located at the axis of the core film body and is connected to a motor. Among them, the length direction of the grooves is parallel to the axis of the core film body, and the directions of the cross-sections of the grooves are the same. When the blank is wound around the core film body, the core film body rotates driven by the motor, and the damping rods in the grooves are forced to roll towards the tip of the wedge. The outer edge of the damping rod is higher than the outer circumferential edge of the core film body and the exceeded height gradually increases, thereby tightening the wound pipe.

[0036] The outermost edge of the damping rod exceeds the outer circumferential edge of the core film body. The number of grooves is the same as that of the damping rods, and the grooves and the damping rods correspond one by one. Among them, the damping rods can roll in the grooves. There are multiple groups of grooves and damping rods to cooperate in tightening the wound pipe.

[0037] As Figure 1 As shown, the buckle winding device further includes a guide roller 4 and a rolling roller 5. The blank extruded from the profiled bar die is wound around the core film assembly in a spiral manner through the guide roller and the rolling roller. Among them, the guide roller is used to adjust the direction and position of the blank. The rolling roller is located above the core film assembly and presses the newly extruded blank onto the core film body so that the buckle of the blank is wedged and overlapped with that of the previous turn of the blank, facilitating the further compaction and shaping by the shaping roller. The blank passing through the rolling roller and the shaping roller in sequence can ensure tight winding. The guide roller 4 is arranged on the head plate of the frame by welding, the rolling roller 5 is connected to the head plate of the frame through a flange, and the core film assembly 7 is connected to the head plate of the frame through a flange.

[0038] A method for forming a large-diameter polymer pipe by buckle winding. First, a polymer material is extruded into a blank through a profiled bar die by a first extruder. The cross-section of the blank includes a buckle structure that is centrosymmetric. The blank is wound around the core film assembly in a spiral manner, and the buckles of adjacent turns of the blank are wedged and overlapped. The shaping roller presses the wound blank tightly on the core film assembly for shaping. A limiting and material-blocking lining plate is provided at the end of the core film assembly. The limiting and material-blocking lining plate enables the blank to be wound in a spiral manner and makes the wound pipe extend along the axial direction of the core film assembly, thereby realizing the continuous forming of a large-diameter pipe. Among them, the core film assembly adopts active driving, and the buckle structure enables the newly wound blank to be wedged and overlapped with the previous turn of the blank, and the blank is wound on the core film assembly and performs seamless overlap.

[0039] Above the core film assembly, there is a rolling mill. The extruded blank first completes the lap joint of the buckle under the action of the rolling mill, and the shaping pressure roller further compacts and shapes it. The core film assembly includes a drum-shaped core film body and damping rods. The circumferential wall of the core film body is evenly distributed with grooves having a wedge-shaped cross-section. The damping rods are limited in the grooves of the core film body, and the outermost edge of the damping rods is higher than the outermost edge of the core film body. When the blank is wound on the core film assembly, the damping rods roll outwards to tightly support the wound pipeline.

[0040] The polymer material for the formed pipeline is ultra-high molecular weight polyethylene, high-density polyethylene or polyvinyl chloride.

[0041] Embodiment 2

[0042] In this embodiment, a large-diameter polymer pipeline buckle winding forming device, compared with Embodiment 1, the difference is that, as Figure 5 shown, there is a second extruder 11. The first extruder and the second extruder are hot co-extruded. The second extruder extrudes an adhesive 12 through a die to the buckle winding device. As Figure 6 shown, the adhesive enters the gap generated at the buckle due to the winding deformation between the newly extruded profiled bar blank and the previous lap of the profiled bar blank. The wound blank is then tightly pressed by the shaping pressure roller on the core film assembly for shaping.

[0043] Embodiment 3

[0044] In this embodiment, a large-diameter polymer pipeline buckle winding forming device, compared with Embodiment 1, the difference is that as shown in Figure 7, the middle part of the cross-section of the profiled bar blank is a solid structure, and the cross-section of the profiled bar blank is in a horizontally placed "S" shape.

[0045] As described above, the present invention can be preferably realized. The above embodiments are only preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention; that is, all equal changes and modifications made according to the content of the present invention are covered by the scope protected by the claims of the present invention.

Claims

1. A method for winding and forming a large-diameter polymer pipe buckle, characterized in that, First, use a first extruder to extrude a blank from a polymer material through a profile die. The cross-section of the blank includes a snap structure. The blank is wound around a core film assembly in a spiral manner, and the snaps of adjacent turns of the blank are engaged and overlapped. A shaping roller presses the wound blank tightly against the core film assembly for shaping. A limiting and material-blocking lining plate is provided at the end of the core film assembly. The limiting and material-blocking lining plate enables the blank to be wound in a spiral manner and makes the formed pipe extend axially along the core film assembly, thereby realizing the continuous forming of a large-diameter pipe. A roller is provided above the core film assembly. The extruded blank first completes the overlapping of the snaps under the action of the roller, and the shaping roller further compacts and shapes it. The core film assembly includes a drum-shaped core film body and damping rods. Wedge-shaped grooves with a cross-section are evenly distributed on the circumferential wall of the core film body. The damping rods are limited in the grooves of the core film body. The outermost edge of the damping rods is higher than the outermost edge of the core film body. When the blank is wound around the core film assembly, the damping rods roll outwards to tighten the wound pipe.

2. The method for winding and forming a large-diameter polymer pipe buckle according to claim 1, wherein The polymer material is ultra-high molecular weight polyethylene, high-density polyethylene or polyvinyl chloride.

3. A large-diameter polymer pipe buckle winding and forming device, characterized in that, It includes a connected extrusion device and a snap winding device. The extrusion device includes a first extruder and a profile die. The discharge port of the first extruder is connected to the profile die. The cross-section of the blank formed by the profile die includes a snap structure. The snap winding device includes a drum-shaped core film assembly, a shaping roller and a limiting and material-blocking lining plate. The core film assembly is also connected to a motor for driving rotation. The shaping rollers are distributed on the circumference of the core film assembly and press the wound blank tightly. The spiral limiting and material-blocking lining plate is located at one end of the core film assembly. The cross-section of the blank formed by the profile die includes two snap structures. The two snap structures are centrosymmetric, and the middle part of the cross-section is a hollow or solid structure. The core film assembly includes a core film body, core film end caps, damping rods and a core film drive shaft. Wedge-shaped grooves with a cross-section are evenly distributed on the circumferential wall of the core film body. The core film end caps are provided at both ends of the core film body. The damping rods are limited in the grooves of the core film body by the core film end caps. The core film drive shaft is located at the axis of the core film body, and the core film drive shaft is connected to the motor. The outermost edge of the damping rods exceeds the outer circumferential edge of the core film body. The number of grooves and damping rods is the same, and the grooves and damping rods correspond one by one.

4. The large-diameter polymer pipe buckle winding and forming equipment according to claim 3, characterized in that The snap winding device further includes a support disk and limiting bolts. The support disk is located at one end of the core film assembly. The shaping rollers are installed on the support disk. There are 5 to 9 shaping rollers. The limiting and material-blocking lining plate is fixed on the support disk by a plurality of limiting bolts.

5. The large-diameter polymer pipe buckle winding and forming equipment according to claim 3, characterized in that The snap winding device further includes a guide roller and a roller. The blank extruded by the profile die is wound around the core film assembly in a spiral manner through the guide roller and the roller.

6. The large-diameter polymer pipe buckle winding forming equipment according to claim 3, characterized in that The extrusion device further includes a second extruder. The second extruder extrudes an adhesive, and the adhesive bonds the overlapping gap between the snaps of the newly wound blank and the snaps of the previous turn of the blank.

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