One-time pouring forming process and matching equipment for plastic inside and outside steel wire mesh framework

Abstract

The application provides a steel wire mesh framework inner and outer plastic one-time pouring forming process, which comprises the following steps: manufacturing a special mold, which comprises a coarse-diameter cylindrical section and a fine-diameter cylindrical section; winding an initial stage steel wire mesh framework on the surface of the coarse-diameter cylindrical section, welding and fixing each intersection point to form a steel wire cage; dragging the steel wire cage to pass through an extruder die head, a first vacuum water tank and a first traction machine in sequence; winding a pouring stage steel wire mesh framework on the surface of the coarse-diameter cylindrical section, extruding high-density polyethylene to the surface of the fine-diameter cylindrical section to cover the inner and outer sides of the steel wire mesh framework to form a composite pipe blank; continuing to drag the steel wire cage to make the composite pipe blank pass through the first vacuum water tank for cooling and setting, and then pass through the first traction machine and be dragged by the first traction machine; and the pouring stage steel wire mesh framework in the late stage of dragging passes through the fine-diameter cylindrical section first, pours and plasticizes the high-density polyethylene, and then enters the first vacuum water tank for cooling and setting. The application also provides a device for implementing the above steel wire mesh framework inner and outer plastic one-time pouring forming process.

Description

Technical Field

[0001] This invention relates to the field of steel wire mesh reinforced plastic composite pipe production technology, specifically, to a one-time casting molding process and supporting equipment for the inner and outer plastics of a steel wire mesh reinforced pipe. Background Technology

[0002] Steel wire mesh reinforced plastic (polyethylene) composite pipe is a type of pipe made by spirally winding high-strength steel wire into a mesh skeleton, covering the inner and outer layers with high-density polyethylene, and then bonding them together with hot melt adhesive. It combines the strength of metal with the corrosion resistance of plastic and is widely used in gas transmission, water supply and other fields.

[0003] Currently, the mainstream production process of steel wire mesh reinforced plastic composite pipe mainly includes five steps: inner core tube preparation, steel wire mesh winding, outer tube covering, cutting, and port sealing. Among them, the first three steps are the core steps of product forming.

[0004] In the inner core tube preparation step, a first extruder is used to plasticize the high-density polyethylene raw material and extrude it into a tubular inner layer. This is then shaped using a vacuum sizing sleeve and cooled in a vacuum water tank to obtain the inner core tube blank. In the wire mesh winding step, a traction machine is used to pull the inner core tube forward, while two wire winding machines spirally wind the first and second layers of wire onto the outside of the inner core tube, respectively. The two wire winding machines rotate in opposite directions, ultimately forming a diamond-shaped reinforcing skeleton through the intersecting wires. In the outer tube covering step, the inner core tube with the wire mesh skeleton continues to be pulled forward by the traction machine, and a second extruder simultaneously extrudes the outer layer of high-density polyethylene, covering the outside of the wire mesh skeleton. It is then cooled in a vacuum water tank to complete the cooling and shaping of the outer tube.

[0005] In the above-mentioned mainstream production process, since the inner core tube and the outer tube are cast in two stages, the following disadvantages will exist: (1) In order to bond the inner core tube, the wire mesh skeleton and the outer tube into one, the wire mesh skeleton also needs to be injected with adhesive resin. The adhesive resin first melts and bonds with the inner core tube, and then fuses with the extruded outer tube. The whole process is long and a large number of equipment are used; (2) During the transmission process, the surface of the inner core tube is prone to adsorbing dust, moisture or grease, forming a "weak interface layer". This will weaken the bonding strength between the wire mesh skeleton / adhesive resin and the inner core tube, resulting in interlayer peeling, which poses a hidden danger to the pressure resistance and long-term life of the pipe; (3) The inner core tube has internal stress after cooling. When the outer tube and adhesive resin are wrapped, it is heated again. The external heat and internal cold easily generate new thermal stress. The overall residual stress of the composite pipe is complex, which will lead to unstable dimensions, warping or decreased creep resistance during long-term use.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for simultaneously casting inner and outer plastic layers. This avoids the problems of a "weak boundary layer" on the surface of the inner core tube and the complex residual stress caused by repeated heating in traditional processes. As a result, this invention provides a one-time casting process and supporting equipment for steel wire mesh skeleton plastics, which can improve pipe quality, shorten the process flow, and reduce the number of equipment required.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a one-time casting molding process for the inner and outer plastics of a steel wire mesh skeleton, comprising the following steps: Step S1: Make a special mold, which includes a thick-diameter cylindrical section for winding the steel wire mesh skeleton and a thin-diameter cylindrical section for casting the inner and outer plastic layers. The surface of the thick-diameter cylindrical section is covered with a nylon 66 plastic layer. Step S2: The two wire winding machine turntables move in opposite directions to wind the initial stage of the wire mesh skeleton on the surface of the coarse diameter cylindrical section, and weld and fix the various intersections of the wire mesh skeleton to form a wire cage for dragging. Step S3: Drag the wire cage through the die head of the extruder, the first vacuum water tank, and the first traction machine in sequence; Step S4: The wire mesh skeleton of the casting stage is wound around the surface of the coarse diameter cylindrical section. When the wire mesh skeleton passes through the fine diameter cylindrical section, the die of the extruder extrudes the plasticized high-density polyethylene onto the surface of the fine diameter cylindrical section, covering the inner and outer sides of the wire mesh skeleton to form a composite tube blank. Step S5: Continue to drag the wire cage so that the composite tube blank passes through the first vacuum water tank for cooling and shaping, and then passes through the first traction machine, which pulls the composite tube blank from the outer wall to remove the drag on the wire cage. Step S6: The first traction machine pulls the composite tube blank forward. The steel wire mesh skeleton in the later casting stage is first pulled through the small diameter cylindrical section, and the plasticized high-density polyethylene is cast by the extruder and then enters the first vacuum water tank for cooling and shaping. In steps S4 and S6, the coarse-diameter cylindrical section is always kept at 50-60°C. After the wire mesh skeleton is wound, it is heated from a cold state to 50-60°C.

[0009] Beneficial effects: Through the counter-movement of the turntables of two wire winding machines, the steel wire forms a classic double-helix diamond mesh structure. The special mold can be designed according to the finished pipe size to determine the diameters of the coarse-diameter cylindrical section and the fine-diameter cylindrical section. First, the wire mesh skeleton wound in the initial stage is welded and fixed into a wire cage. The wire cage acts as a traction head, capable of independently dragging the wire mesh skeleton forward until the composite pipe blank is loaded onto the machine (pulled by the first traction machine). Subsequently, it is pulled forward by the first traction machine. Then, by setting the coarse-diameter cylindrical section to always be at 50-60℃, after the wire mesh skeleton is wound, it is heated from a cold state to 50-60℃, causing the wire mesh skeleton to thermally expand. At the same time, the surface of the coarse-diameter cylindrical section... The material is coated with a smooth nylon 66 plastic layer. The combination of the two reduces the friction between the wire mesh skeleton and the coarse-diameter cylindrical section, allowing the wire mesh skeleton to advance smoothly on the mold surface. Finally, an annular extrusion space is formed between the extruder die and the fine-diameter cylindrical section. The plasticized high-density polyethylene passes through the mesh of the wire mesh skeleton, enabling the inner and outer plastic layers to be cast in one step while maintaining the classic double-helix diamond mesh structure. It then immediately enters the first vacuum water tank for cooling and shaping, thereby avoiding the "weak boundary layer" problem on the surface of the inner core tube and the complex residual stress problem caused by repeated heating in traditional processes. This improves pipe quality, shortens the process flow, and reduces the number of equipment.

[0010] Based on the above, in steps S4 and S6, a cooling mechanism is provided inside the narrow-diameter cylindrical section to perform preliminary cooling on the inner wall of the composite tube blank.

[0011] Beneficial effects: The cooling mechanism can initially shape the inner wall of the composite tube blank, preventing it from deforming rapidly before it enters the first vacuum water tank for formal cooling and shaping.

[0012] Based on the above, the narrow-diameter cylindrical section includes a casting section passing through the extruder die and an output section extending out of the extruder die, wherein the diameter of the output section is 2-3 mm smaller than the diameter of the casting section.

[0013] Beneficial effects: The composite tube blank will shrink after cooling, and the diameter of the output part is 2-3mm smaller than the diameter of the casting part, which can prevent the composite tube blank from getting stuck and make it move smoothly.

[0014] Based on the above, in step S5, the wire cage is finally cut off.

[0015] Beneficial effect: After the wire cage is cut off, the composite tube blank can be transported using traditional traction equipment and methods.

[0016] Based on the above, it also includes: Step S7: The composite tube blank output from the first traction machine passes through the second vacuum water tank for secondary cooling, the third vacuum water tank for tertiary cooling, and then passes through the second traction machine, which pulls the composite tube blank from the outer wall.

[0017] Beneficial effects: Due to the integral molding of the inner and outer plastic layers, the pipe wall is thicker. By setting the second traction machine, the composite pipe blank can be pulled through the second vacuum water tank and the third vacuum water tank, and the shaping effect is guaranteed through three cooling processes.

[0018] Based on the above, the cooling water temperature gradient in the first vacuum water tank, the second vacuum water tank, and the third vacuum water tank decreases.

[0019] Beneficial effects: When plastics are rapidly cooled from the molten state, the uneven shrinkage of the surface and core will generate huge internal stress. Gradient cooling makes the cooling rate of the inside and outside tend to be consistent, which can greatly reduce residual internal stress.

[0020] Based on the above, when the equipment is shut down, the composite tube blank will deform in the gap area between the die head of the extruder and the first vacuum water tank. After production is resumed, the step of cutting off the deformed part is also included.

[0021] Beneficial effects: After the deformed part is removed, the remaining part can still be cast, cooled and shaped normally, and cut, allowing for normal production.

[0022] The present invention also provides an apparatus for implementing the above-described one-time casting molding process of inner and outer plastics for steel wire mesh skeletons, comprising: A special mold, comprising a coarse-diameter cylindrical section and a fine-diameter cylindrical section, wherein the surface of the coarse-diameter cylindrical section is covered with a nylon 66 plastic layer, and the fine-diameter cylindrical section comprises a casting part and an output part, wherein the diameter of the output part is 2-3 mm smaller than the diameter of the casting part; Two wire winding machines are used, with the coarse-diameter cylindrical section passing through the center hole of the turntable of the two wire winding machines. The turntables of the two wire winding machines rotate in opposite directions to wind a wire mesh skeleton on the surface of the coarse-diameter cylindrical section. An extruder, wherein the casting section is disposed inside the extruder die, and an annular extrusion space is formed between the extruder die and the casting section for casting inner and outer layers of plastic on a wire mesh skeleton, and the output section extends out of the extruder die; The first vacuum water tank, the first traction machine, the pulling device, the second vacuum water tank, the third vacuum water tank, the second traction machine, and the pipe cutting machine are connected sequentially according to the pipe transmission direction. The inlet of the first vacuum water tank receives the composite pipe blank output from the output section. The pulling device is located at the output end of the first traction machine. The pulling device includes a reciprocating claw mechanism and a lifting cage seat. The lifting cage seat supports or detaches from the bottom of the wire cage by lifting and lowering. The reciprocating claw mechanism can grab or release the outer wall of the wire cage and pull it forward by reciprocating motion.

[0023] Based on the above, the reciprocating gripper mechanism includes a guide rail parallel to the transmission direction and a pair of telescopic arms that reciprocate along the guide rail. The pair of telescopic arms are symmetrically arranged on both sides of the wire cage transmission path, and the telescopic ends are provided with grippers for grabbing the wire cage.

[0024] Based on the above, the coarse-diameter cylindrical section has a heating resistance wire built into it close to the outer peripheral wall, and a coolant inlet / outlet channel is opened at the central axis of the coarse-diameter cylindrical section. The thin-diameter cylindrical section has a coil-shaped cooling cavity that communicates with the coolant inlet / outlet channel. The heating resistance wire is connected to a power line from the end of the coarse-diameter cylindrical section away from the thin-diameter cylindrical section, and the coolant inlet / outlet channel is also connected to a coolant supply device from the end of the coarse-diameter cylindrical section away from the thin-diameter cylindrical section. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the equipment used in this invention for implementing the one-time casting molding process of plastic inside and outside the steel wire mesh skeleton.

[0026] Figure 2 This is a schematic diagram of the structure of the special mold in this invention.

[0027] Figure 3 This is a schematic diagram of the dragging device in this invention.

[0028] In the diagram: 1. Special mold; 2. Wire winding machine; 3. Extruder; 31. Die head; 4. First vacuum water tank; 5. First traction machine; 6. Pulling device; 61. Reciprocating claw mechanism; 62. Lifting cage seat; 7. Second vacuum water tank; 8. Third vacuum water tank; 9. Second traction machine; 10. Pipe cutter; 11. Large diameter cylindrical section; 12. Small diameter cylindrical section; 121. Casting section; 122. Output section; 13. Nylon 66 plastic layer; 14. Heating resistance wire; 15. Coolant inlet and outlet channels; 16. Coil-shaped cooling chamber. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through specific embodiments. Example 1

[0030] A process for one-time casting of inner and outer plastics in a steel wire mesh skeleton includes the following steps: Step S1: Make a special mold 1, which includes a coarse-diameter cylindrical section 11 for winding the steel wire mesh skeleton and a fine-diameter cylindrical section 12 for casting the inner and outer plastic layers. Step S2: Wrap the initial stage steel wire mesh skeleton around the surface of the coarse diameter cylindrical section 11, and weld and fix the various intersections of the steel wire mesh skeleton to form a steel wire cage for dragging. Step S3: Drag the wire cage through the die 31 of the extruder 3, the first vacuum water tank 4 and the first traction machine 5 in sequence; Step S4: The wire mesh skeleton of the casting stage is wound around the surface of the coarse diameter cylindrical section 11. When the wire mesh skeleton passes through the fine diameter cylindrical section 12, the die 31 of the extruder 3 extrudes the plasticized high-density polyethylene onto the surface of the fine diameter cylindrical section 12, covering the inner and outer sides of the wire mesh skeleton to form a composite tube blank. Step S5: Continue to drag the wire cage so that the composite tube blank passes through the first vacuum water tank 4 for cooling and shaping, and then passes through the first traction machine 5, which pulls the composite tube blank from the outer wall, removes the drag on the wire cage, and cuts off the wire cage; at this time, the composite tube blank is completed on the machine, and can be transported in the future using traditional traction equipment and methods. Step S6: The first traction machine 5 pulls the composite tube blank forward. The steel wire mesh skeleton in the later casting stage first passes through the small diameter cylindrical section 12, and the plasticized high-density polyethylene is cast by the extruder 3, and then enters the first vacuum water tank 4 for cooling and shaping. Step S7: The composite tube blank output from the first traction machine 5 passes through the second vacuum water tank 7 for secondary cooling, the third vacuum water tank 8 for tertiary cooling, and then passes through the second traction machine 9, which pulls the composite tube blank from the outer wall. The cooling water temperature in the first vacuum water tank 4 is 40°C, the cooling water temperature in the second vacuum water tank 7 is 30°C, and the cooling water temperature in the third vacuum water tank 8 is 22°C, which decreases in a gradient. This makes the internal and external cooling rates more consistent and greatly reduces residual internal stress.

[0031] Working principle: The special mold 1 is designed according to the finished pipe size, with the diameters of the coarse-diameter cylindrical section 11 and the fine-diameter cylindrical section 12. The turntables of the two wire winding machines 2 move in opposite directions, crisscrossing to wind the wire mesh skeleton. The wire mesh skeleton wound in the initial stage is first welded and fixed into a wire cage. The wire cage acts as a traction head, which can drag the wire mesh skeleton forward independently until the composite pipe blank is loaded onto the machine (pulled by the first traction machine 5). Subsequently, it is pulled forward by the first traction machine 5. The die head 31 of the extruder 3 forms an annular extrusion space between itself and the fine-diameter cylindrical section 12. The plasticized high-density polyethylene passes through the mesh of the wire mesh skeleton, completing the casting of the inner and outer plastic layers in one go. Then, it immediately enters the first vacuum water tank 4 for cooling and shaping. Since the inner and outer plastic layers are integrally formed, the pipe wall thickness is thicker. By setting the second traction machine 9, the composite pipe blank can be pulled through the second vacuum water tank 7 and the third vacuum water tank 8. The shaping effect is ensured through three cooling processes.

[0032] To prevent the wire mesh skeleton from peeling off from the inner and outer plastic layers and to ensure smooth dragging, in steps S4 and S6, the wire mesh skeleton wound around the surface of the coarse-diameter cylindrical section 11 is preheated to 50-60°C. This reduces the temperature difference of the materials, and the coarse-diameter cylindrical section 11 is always kept at 50-60°C (there is no thermal expansion problem during production). After the wire mesh skeleton is wound, it is heated from a cold state to 50-60°C, which will cause thermal expansion. In addition, the surface of the coarse-diameter cylindrical section 11 is covered with a nylon 66 plastic layer 13, making the surface smoother, which will reduce friction with the surface of the coarse-diameter cylindrical section 11.

[0033] The narrow-diameter cylindrical section 12 is equipped with a cooling mechanism to initially cool the inner wall of the composite tube blank, preventing it from deforming rapidly before entering the first vacuum water tank 4 for formal cooling and shaping. The narrow-diameter cylindrical section 12 includes a casting part 121 passing through the die 31 of the extruder 3 and an output part 122 extending out of the die 31 of the extruder 3. The diameter of the output part 122 is 2-3 mm smaller than the diameter of the casting part 121. The inner wall of the composite tube blank will shrink after cooling, and the output part 122 can prevent the composite tube blank from getting stuck.

[0034] When the equipment is shut down, the composite tube blank will deform in the gap area from the die 31 of the extruder 3 to the first vacuum water tank 4. After production is resumed, the deformed part will be cut off. The remaining part can still be cast, cooled and shaped, and cut normally, and can be produced normally. Example 2

[0035] like Figure 1-3 The present invention also provides an apparatus for implementing the one-time casting molding process of the inner and outer plastics of the steel wire mesh skeleton in Embodiment 1, comprising: Special mold 1, the special mold includes a coarse-diameter cylindrical section 11 and a fine-diameter cylindrical section 12, the surface of the coarse-diameter cylindrical section 11 is covered with a nylon 66 plastic layer 13, the fine-diameter cylindrical section 12 includes a casting part 121 and an output part 122, the diameter of the output part 122 is 2-3mm smaller than the diameter of the casting part 121; Two wire winding machines 2, the coarse-diameter cylindrical section 11 passes through the center hole of the turntable of the two wire winding machines 2, and the turntables of the two wire winding machines 2 rotate in opposite directions to wind a wire mesh skeleton on the surface of the coarse-diameter cylindrical section 11. The extruder 3 has a casting section 121 that passes through the die 31 of the extruder 3, and an annular extrusion space is formed between the die 31 of the extruder 3 and the casting section 121 for casting inner and outer layers of plastic on the wire mesh skeleton. The output section 122 extends out of the die 31 of the extruder 3. The first vacuum water tank 4, the first traction machine 5, the pulling device 6, the second vacuum water tank 7, the third vacuum water tank 8, the second traction machine 9, and the pipe cutting machine 10 are connected sequentially in the direction of pipe transmission. The inlet of the first vacuum water tank 5 receives the composite pipe blank output from the output section 122. The pulling device 6 is located at the output end of the first traction machine 5. The pulling device 6 includes a reciprocating claw mechanism 61 and a lifting cage seat 62. The lifting cage seat 62 supports or detaches from the bottom of the wire cage by lifting and lowering. The reciprocating claw mechanism 61 can grab or release the outer wall of the wire cage and pull it forward by reciprocating motion.

[0036] The reciprocating gripper mechanism 61 includes a guide rail 611 parallel to the transmission direction and a pair of telescopic arms 612 that reciprocate along the guide rail 611. The pair of telescopic arms 612 are symmetrically arranged on both sides of the wire cage transmission path, and the telescopic ends are equipped with grippers 613 for gripping the wire cage. When pulling the wire cage, the telescopic arms 612 first move to the front end, the telescopic arms 612 extend, and the grippers 613 grip the cage wall. The telescopic arms 612 then move to the rear end, dragging the wire cage backward. Subsequently, the grippers 613 release the cage wall, the telescopic arms 612 retract, and the telescopic arms 612 move to the front end again to repeat the above actions. It should be noted that when the wire cage is dragged forward, the composite tube blank cannot be cooled in time and undergoes significant deformation. In subsequent production, defective products produced earlier can be cut off.

[0037] The coarse-diameter cylindrical section 11 has a heating resistance wire 14 embedded close to its outer peripheral wall. A coolant inlet / outlet channel 15 is provided at the central axis of the coarse-diameter cylindrical section 11. A coiled cooling chamber 16 communicating with the coolant inlet / outlet channel 15 is provided in the fine-diameter cylindrical section 12. The heating resistance wire 14 is connected to a power line from the end of the coarse-diameter cylindrical section 11 away from the fine-diameter cylindrical section 12 to provide preheating for the wire mesh skeleton wound on the outer wall of the coarse-diameter cylindrical section 11. The coolant inlet / outlet channel 15 is also connected to a coolant supply device from the end of the coarse-diameter cylindrical section 11 away from the fine-diameter cylindrical section 12 to perform preliminary cooling and shaping of the inner wall of the cast composite tube blank.

[0038] The equipment in this embodiment can be used to implement the one-time casting molding process of the inner and outer plastics of the steel wire mesh skeleton in Embodiment 1, thereby avoiding the problem of the "weak boundary layer" on the surface of the inner core tube and the complex problem of residual stress caused by repeated heating in the traditional process, thus improving the quality of the pipeline, shortening the process flow and reducing the number of equipment.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A process for one-time casting of inner and outer plastics in a steel wire mesh skeleton, characterized in that, Includes the following steps: Step S1: Make a special mold, which includes a thick-diameter cylindrical section for winding the steel wire mesh skeleton and a thin-diameter cylindrical section for casting the inner and outer plastic layers. The surface of the thick-diameter cylindrical section is covered with a nylon 66 plastic layer. Step S2: The two wire winding machine turntables move in opposite directions to wind the initial stage of the wire mesh skeleton on the surface of the coarse diameter cylindrical section, and weld and fix the various intersections of the wire mesh skeleton to form a wire cage for dragging. Step S3: Drag the wire cage through the die head of the extruder, the first vacuum water tank, and the first traction machine in sequence; Step S4: The wire mesh skeleton of the casting stage is wound around the surface of the coarse diameter cylindrical section. When the wire mesh skeleton passes through the fine diameter cylindrical section, the die of the extruder extrudes the plasticized high-density polyethylene onto the surface of the fine diameter cylindrical section, covering the inner and outer sides of the wire mesh skeleton to form a composite tube blank. Step S5: Continue to drag the wire cage so that the composite tube blank passes through the first vacuum water tank for cooling and shaping, and then passes through the first traction machine, which pulls the composite tube blank from the outer wall to remove the drag on the wire cage. Step S6: The first traction machine pulls the composite tube blank forward. The steel wire mesh skeleton in the later casting stage is first pulled through the small diameter cylindrical section, and the plasticized high-density polyethylene is cast by the extruder and then enters the first vacuum water tank for cooling and shaping. In steps S4 and S6, the coarse-diameter cylindrical section is always kept at 50-60°C. After the wire mesh skeleton is wound, it is heated from a cold state to 50-60°C.

2. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to claim 1, characterized in that: In steps S4 and S6, a cooling mechanism is provided inside the narrow-diameter cylindrical section to perform preliminary cooling on the inner wall of the composite tube blank.

3. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to claim 2, characterized in that: The narrow-diameter cylindrical section includes a casting section passing through the extruder die and an output section extending out of the extruder die, wherein the diameter of the output section is 2-3 mm smaller than the diameter of the casting section.

4. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to any one of claims 1-3, characterized in that: In step S5, the wire cage is finally cut off.

5. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to claim 4, characterized in that, It also includes: Step S7: The composite tube blank output from the first traction machine passes through the second vacuum water tank for secondary cooling, the third vacuum water tank for tertiary cooling, and then passes through the second traction machine, which pulls the composite tube blank from the outer wall.

6. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to claim 5, characterized in that: The cooling water temperature gradient decreases in the first vacuum water tank, the second vacuum water tank, and the third vacuum water tank.

7. The one-time casting molding process for the inner and outer plastics of the steel wire mesh skeleton according to claim 6, characterized in that: When the equipment is shut down, the composite tube blank will deform in the gap area between the die of the extruder and the first vacuum water tank. After production is resumed, the step of cutting off the deformed part is also included.

8. An apparatus for implementing the one-time casting molding process of inner and outer plastics for a steel wire mesh skeleton as described in any one of claims 1-7, characterized in that, include: A special mold, comprising a coarse-diameter cylindrical section and a fine-diameter cylindrical section, wherein the surface of the coarse-diameter cylindrical section is covered with a nylon 66 plastic layer, and the fine-diameter cylindrical section comprises a casting part and an output part, wherein the diameter of the output part is 2-3 mm smaller than the diameter of the casting part; Two wire winding machines are used, with the coarse-diameter cylindrical section passing through the center hole of the turntable of the two wire winding machines. The turntables of the two wire winding machines rotate in opposite directions to wind a wire mesh skeleton on the surface of the coarse-diameter cylindrical section. An extruder, wherein the casting section is disposed inside the extruder die, and an annular extrusion space is formed between the extruder die and the casting section for casting inner and outer layers of plastic on a wire mesh skeleton, and the output section extends out of the extruder die; The first vacuum water tank, the first traction machine, the pulling device, the second vacuum water tank, the third vacuum water tank, the second traction machine, and the pipe cutting machine are connected sequentially according to the pipe transmission direction. The inlet of the first vacuum water tank receives the composite pipe blank output from the output section. The pulling device is located at the output end of the first traction machine. The pulling device includes a reciprocating claw mechanism and a lifting cage seat. The lifting cage seat supports or detaches from the bottom of the wire cage by lifting and lowering. The reciprocating claw mechanism can grab or release the outer wall of the wire cage and pull it forward by reciprocating motion.

9. The equipment for implementing the one-time casting molding process of inner and outer plastics of a steel wire mesh skeleton according to claim 8, characterized in that: The reciprocating gripper mechanism includes a guide rail parallel to the transmission direction and a pair of telescopic arms that reciprocate along the guide rail. The pair of telescopic arms are symmetrically arranged on both sides of the wire cage transmission path, and the telescopic ends are provided with grippers for grabbing the wire cage.

10. The equipment for implementing the one-time casting molding process of inner and outer plastics of a steel wire mesh skeleton according to claim 8, characterized in that: The thick-diameter cylindrical section has a heating resistance wire built into it close to the outer peripheral wall. A coolant inlet and outlet channel is opened at the central axis of the thick-diameter cylindrical section. A coil-shaped cooling cavity communicating with the coolant inlet and outlet channel is opened in the thin-diameter cylindrical section. The heating resistance wire is connected to a power line from the end of the thick-diameter cylindrical section away from the thin-diameter cylindrical section. The coolant inlet and outlet channel is also connected to a coolant supply device from the end of the thick-diameter cylindrical section away from the thin-diameter cylindrical section.

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