PERT directly-buried thermal insulation pipe and one-step production equipment thereof

Abstract

The one-step production equipment of the PERT direct burial thermal insulation pipe is provided with a workpiece supporting mechanism, a workpiece traction conveying mechanism, a working pipe infrared heating device, an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine, an outer protective pipe sizing and corona treatment device, a deviation correcting device, a cooling system and a cutting device. The workpiece supporting mechanism is provided with a supporting pull rod sleeved with a workpiece working pipe, the supporting pull rod is formed by connecting multiple sets of supporting pull rod single bodies in series and penetrates through the front end and the rear end of the production line, and cylinders matched with the inner diameter of the working pipe are welded to the middles of part of the supporting pull rod single bodies. The two groups of workpiece traction conveying mechanisms are arranged front and back and are positioned on the two sides of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine; the working pipe infrared heating device, the outer protective pipe sizing and corona treatment device, the deviation rectifying device, the cooling system and the cutting device are sequentially arranged in the workpiece conveying direction. According to the utility model, the purposes of improving the working efficiency and ensuring the product quality are achieved.

Description

Technical Field

[0001] The utility model relates to a thermal insulation composite plastic pipe and production equipment thereof, in particular to a PERT direct-buried thermal insulation pipe with a working pipe made of PERT (heat-resistant polyethylene) pipe, a thermal insulation layer made of polyurethane foam material, and an outer protective pipe made of polyethylene casing and one-step production equipment thereof. Background Art

[0002] The thermal insulation composite plastic pipe has good corrosion resistance and heat insulation performance. Because of its convenient construction and long service life, it has been widely used in solar water heating systems, air-energy heat pump hot water systems, central air-conditioning hot and cold water pipelines, air compressor waste heat recovery hot water systems and heating insulation pipelines.

[0003] The one-step molding production process of prefabricated insulated pipes refers to the process of forming an outer protective pipe on the outside of the working pipe by cooperating with an outer protective pipe extruder and a polyurethane foaming machine. After the outer protective pipe is extruded and molded, a circular ring space is formed between the working pipe and the outer protective pipe, and then the polyurethane insulation layer is foamed in the circular ring space. Because it can realize a continuous production process, it greatly improves the work efficiency. In the prior art, the one-step molding process of prefabricated insulated pipes is mainly aimed at products whose working pipes are steel pipes. When the working pipe is made of PERT material, due to the large thermal expansion coefficient of the plastic working pipe, the size changes easily occur during the transportation, heating and cooling links, which makes it difficult to accurately control the concentricity of the working pipe and the outer protective pipe, which has an adverse effect on the product quality. Utility Model Content

[0004] The utility model provides a one-step production equipment for PERT direct-buried thermal insulation pipe, which aims to realize a one-step molding production process of thermal insulation composite plastic pipe through the cooperation of a workpiece support mechanism, a workpiece traction and conveying mechanism, a working pipe infrared heating device, an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine, an outer protective pipe sizing and corona treatment device, a deviation correction device, a cooling system and a cutting device, so as to achieve the purpose of improving work efficiency and ensuring product quality.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A PERT direct-buried insulated pipe comprises a working pipe, an insulation layer and an outer protective pipe. The outer protective pipe and the insulation layer are formed outside the working pipe by a one-step process. The working pipe is made of PERT pipe material, the insulation layer is a polyurethane foam layer, and the outer protective pipe is a polyethylene sleeve.

[0007] A one-step production equipment for PERT direct-buried thermal insulation pipes, comprising a workpiece support mechanism, a workpiece traction and conveying mechanism, a working pipe infrared heating device, an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine, an outer protective pipe sizing and corona treatment device, a deviation correction device, a cooling system and a cutting device; the workpiece support mechanism comprises a support seat arranged on a horizontal ground and a support pull rod sleeved inside the workpiece working pipe, the support pull rod is composed of a plurality of groups of support pull rod monomers connected in series, passing through the front and rear ends of the production line, and a hollow cylinder matching the inner diameter of the working pipe is welded in the middle of some of the support pull rod monomers; two groups of the workpiece traction and conveying mechanism are arranged in front and back, located on both sides of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine; the working pipe infrared heating device is located in front of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine; the outer protective pipe sizing and corona treatment device, the deviation correction device, the cooling system and the cutting device are located behind the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine, and are arranged in sequence along the workpiece conveying direction.

[0008] The one-step production equipment for the above-mentioned PERT direct-buried thermal insulation pipe has a plurality of rectangular holes on the side wall of the cylinder, and a roller assembly is installed in the rectangular hole; the roller assembly can roll axially on the inner wall of the workpiece working tube, and a roller, a roller shaft and a roller shaft seat are provided in the roller assembly; the roller is rotatably mounted on the roller shaft, and the roller shaft is mounted in the rectangular hole on the side wall of the cylinder through the roller shaft seat.

[0009] The one-step production equipment for the PERT direct-buried thermal insulation pipe is provided with a ring seat at one end of the supporting tie rod unit and a draw hook at the other end.

[0010] The one-step production equipment for the above-mentioned PERT direct-buried insulated pipe comprises several groups of support seats arranged along the workpiece conveying direction, and a supporting roller is arranged on each group of support seats. The supporting roller is a tapered roller that is thin in the middle and thick at both ends, and its contact surface with the workpiece is a V-shaped surface.

[0011] The one-step production equipment for the above-mentioned PERT direct-buried insulated pipe, the workpiece traction and conveying mechanism adopts a three-claw chain conveying structure, including three groups of circulating chain units evenly arranged along the circumference of the outer wall of the workpiece, each group of circulating chain units is provided with a chain, a pressure block, a sprocket assembly, a reduction motor assembly and a baffle; the sprocket assembly is arranged in two groups front and back, installed on the baffles located on the left and right sides thereof, one of which is a driving sprocket assembly connected to the reduction motor assembly; the chain and the two groups of sprocket assemblies are assembled to form an annular chain, and a pressure block is installed on each chain plate of the chain.

[0012] The one-step production equipment for PERT direct-buried thermal insulation pipes is also provided with a chain tensioner in each set of circulating chain units. The chain tensioner is installed on the baffle and is located on the side of the circular chain away from the workpiece.

[0013] The one-step production equipment for the above-mentioned PERT direct-buried thermal insulation pipe, the workpiece traction and conveying mechanism is also provided with a circulating chain unit position adjustment component; the circulating chain unit position adjustment component is arranged in two groups before and after the circulating chain unit, and each group is provided with an adjustment motor, a fixed seat, a wall panel, a screw rod, a moving block and a guide rail; the adjustment motor, the fixed seat and the guide rail are all installed on the wall panel, and the output shaft of the adjustment motor is fastened to the screw rod; the screw rod and the moving block cooperate to form a screw nut transmission structure; the moving block is fixedly assembled with the baffle of the circulating chain unit, and a guide groove cooperating with the guide rail is also provided on the moving block.

[0014] The one-step production equipment for the above-mentioned PERT direct-buried insulated pipe, the outer protective pipe sizing and corona treatment device includes a sizing sleeve, a copper wire mesh and a water spray pipe; the sizing sleeve is installed at the head discharge port of the outer protective pipe extrusion and insulation layer polyurethane foaming machine, and its outer diameter size matches the inner diameter size of the extruded outer protective pipe, and the copper wire mesh is attached to the outside of the sizing sleeve as the positive electrode of the corona treatment; the water spray pipe is located above the extruded outer protective pipe and is connected to an external water source, and the water sprayed by the water spray pipe is used as the negative electrode of the corona treatment, and the positive and negative electrodes of the corona treatment are respectively connected to an external high-voltage power supply through wires.

[0015] The above-mentioned PERT direct-buried insulated pipe one-step production equipment, the cutting device is provided with a working pipe joint position sensor, through which the joint information of two adjacent sections of the working pipe wrapped in the outer protective pipe and the insulation layer is collected, and then the control system instructs the cutting device to operate, and the continuously formed workpiece is cut off at the working pipe joint.

[0016] The utility model provides a PERT direct-buried thermal insulation pipe and one-step production equipment thereof. The PERT direct-buried thermal insulation pipe adopts a one-step process to complete the molding of an outer protective pipe and a thermal insulation layer outside a working pipe; the one-step production equipment for the PERT direct-buried thermal insulation pipe can realize the one-step molding production process of the thermal insulation composite plastic pipe through the cooperation of a workpiece support mechanism, a workpiece traction and conveying mechanism, a working pipe infrared heating device, an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine, an outer protective pipe sizing and corona treatment device, a deviation correction device, a cooling system and a cutting device. In particular, a support pull rod running through the front and rear ends of the production line is arranged in the workpiece support mechanism, and the support pull rod adopts a plurality of end-to-end connected The supporting rod monomers are connected in series, and a cylinder matching the inner diameter of the workpiece working tube is welded in the middle of some of the supporting rod monomers, and a roller assembly is arranged on the outer wall of the cylinder. This not only effectively avoids the problem of difficult to accurately control the concentricity with the outer protective tube due to the change in the size of the PERT material working tube during transportation, heating and cooling, but also facilitates the transportation of the working tube along the feeding direction; in addition, the workpiece traction and conveying mechanism of the utility model adopts a three-claw chain conveying structure, and is provided with a circulating chain unit position adjustment component, which can adjust the clamping force of the traction and conveying mechanism according to the size specifications of the workpiece, ensuring that the workpiece is conveyed at a uniform speed under the uniform clamping force. In short, the utility model achieves the purpose of improving work efficiency and ensuring product quality through the above-mentioned technical means. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the PERT direct buried thermal insulation pipe structure;

[0018] Figure 2 This is the overall structural diagram of the one-step production equipment for PERT direct buried thermal insulation pipes;

[0019] Figure 3 Schematic diagram of the support structure;

[0020] Figure 4 yes Figure 3 Side view of

[0021] Figure 5 It is a schematic diagram of the supporting rod monomer structure;

[0022] Figure 6 yes Figure 5 Schematic diagram of the AA section structure;

[0023] Figure 7 yes Figure 6 The enlarged view of the structure at position Ⅰ in the middle;

[0024] Figure 8 yes Figure 5 K-direction local view;

[0025] Fig. 9It is a schematic diagram of the workpiece traction and conveying mechanism;

[0026] Fig.10 yes Fig. 9 Schematic diagram of the BB section structure.

[0027] Explanation of the symbols in the figure:

[0028] 1 is a PERT direct buried insulation pipe, 1-1 is a working pipe, 1-2 is an insulation layer, and 1-3 is an outer protective pipe;

[0029] 2 is a supporting rod connecting seat;

[0030] 3 is a support seat, 3-1 is a support roller, and 3-2 is a V-shaped surface;

[0031] 4 is a supporting rod, 4-1 is a hook, 4-2 is a cylinder, 4-3 is a roller assembly, 4-3-1 is a roller, 4-3-2 is a roller shaft, 4-3-3 is a roller shaft seat, and 4-4 is a ring seat;

[0032] 5 is a workpiece traction conveying mechanism, 5-1 is a pressure block, 5-2 is a chain, 5-3 is a reduction motor assembly, 5-4 is a sprocket assembly, 5-5 is a baffle, 5-6 is a chain tensioner, 5-7 is an adjustment motor, 5-8 is a wall panel, 5-9 is a fixed seat, 5-10 is a screw rod, 5-11 is a moving block, and 5-12 is a guide rail;

[0033] 6 is an infrared heating device for the working tube;

[0034] 7 is an outer protective tube extrusion and insulation layer polyurethane foaming machine;

[0035] 8 is an outer protective tube sizing and corona treatment device, 8-1 is a sizing sleeve, 8-2 is a copper wire mesh, and 8-3 is a water spray pipe;

[0036] 9 is a deviation correction device;

[0037] 10 is a cooling system;

[0038] 11 is a cutting device, and 11-1 is a working pipe joint position sensor. DETAILED DESCRIPTION

[0039] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] Referring to Fig. 1, a PERT direct-buried insulated pipe 1 is formed by a one-step process to form an outer protective pipe and an insulation layer outside a working pipe; the working pipe 1-1 is made of PERT pipe material, the insulation layer 1-2 is a polyurethane foam layer, and the outer protective pipe 1-3 is a polyethylene sleeve.

[0041] See also Figure 1 , Figure 2The utility model provides a one-step production equipment for PERT direct buried thermal insulation pipe, which is used for Figure 1 The continuous production of the PERT direct-buried thermal insulation pipe 1 shown in the figure is provided with a workpiece support mechanism, a workpiece traction and conveying mechanism 5, a working pipe infrared heating device 6, an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7, an outer protective pipe sizing and corona treatment device 8, a correction device 9, a cooling system 10 and a cutting device 11; the workpiece support mechanism comprises a support seat 3 arranged on the horizontal ground and a support pull rod 4 sleeved inside the workpiece working pipe 1-1, the support pull rod 4 is connected in series by a plurality of groups of support pull rod monomers, which pass through the front and rear ends of the production line and are assembled by the support pull rod connecting seats 2 arranged at the front and rear ends of the production line; the workpiece traction and conveying mechanism 5 is arranged in two groups in front and back, and is located on both sides of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7; the working pipe infrared heating device 6 is located in front of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7; the outer protective pipe sizing and corona treatment device 8, the correction device 9, the cooling system 10 and the cutting device 11 are located behind the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7, and are arranged in sequence along the workpiece conveying direction.

[0042] See also Figure 2 The one-step production equipment for PERT direct-buried thermal insulation pipe described in the utility model is provided with a sizing sleeve 8-1, a copper wire mesh 8-2 ​​and a water spray pipe 8-3 in its outer protective pipe sizing and corona treatment device 8; the sizing sleeve 8-1 is installed at the head discharge port position of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7, and its outer diameter size matches the inner diameter size of the extruded outer protective pipe 1-3, and a copper wire mesh 8-2 ​​is attached to the outside of the sizing sleeve 8-1 as the positive electrode of the corona treatment; the water spray pipe 8-3 is located above the extruded outer protective pipe 1-3 and is connected to an external water source, and the water sprayed by the water spray pipe 8-3 is used as the negative electrode of the corona treatment, and the positive and negative electrodes of the corona treatment are respectively connected to an external high-voltage power supply through wires.

[0043] Still viewing Figure 2 The one-step production equipment for PERT direct-buried insulated pipe described in the utility model has a cutting device 11 provided with a working pipe joint position sensor 11-1, which collects the joint information of two adjacent sections of working pipes 1-1 wrapped in the outer protective pipe 1-3 and the insulation layer 1-2, and then instructs the cutting device to operate through the control system to cut off the continuously formed workpiece at the joint position of the outer protective pipe 1-3.

[0044] See also Figure 2 , Figure 3 , Figure 4The one-step production equipment for PERT direct-buried thermal insulation pipe described in the utility model has several groups of support seats 3 arranged along the workpiece conveying direction, and a supporting roller 3-1 is arranged on each group of support seats 3. The supporting roller 3-1 is a tapered roller that is thin in the middle and thick at both ends, and its contact surface with the workpiece is a V-shaped surface 3-2.

[0045] See also Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The one-step production equipment for PERT direct-buried thermal insulation pipe described in the utility model has a ring seat 4-4 at one end of each supporting rod monomer of the supporting rod 4, and a hook 4-1 at the other end, and a cylinder 4-2 matching the inner diameter of the working tube 1-1 is welded in the middle of some supporting rod monomers, and the cylinder 4-2 is a hollow cylindrical structure, and a plurality of rectangular holes are opened on the side wall of the cylinder 4-2, and a roller assembly 4-3 is equipped in each rectangular hole, and the roller assembly 4-3 can roll axially on the inner wall of the workpiece working tube 1-1, and a roller 4-3-1, a roller shaft 4-3-2 and a roller shaft seat 4-3-3 are provided in the roller assembly 4-3; the roller 4-3-1 is rotatably mounted on the roller shaft 4-3-2, and the roller shaft 4-3-2 is installed in the rectangular hole opened on the side wall of the cylinder 4-2 through the roller shaft seat 4-3-3.

[0046] See also Figure 2 , Fig. 9 , Fig.10 The one-step production equipment for PERT direct-buried thermal insulation pipe described in the utility model, its workpiece traction and conveying mechanism 5 adopts a three-claw chain conveying structure, including three groups of circulating chain units evenly arranged along the circumference of the outer wall of the workpiece, and each group of circulating chain units is provided with a chain 5-2, a pressure block 5-1, a sprocket assembly 5-4, a reduction motor assembly 5-3, a baffle 5-5 and a chain tensioner 5-6; the sprocket assembly 5-4 is provided with two groups in front and back, which are installed on the baffles 5-5 located on the left and right sides thereof, one of which is an active sprocket assembly connected to the reduction motor assembly 5-3; the chain 5-2 and the two groups of sprocket assemblies 5-4 are assembled to form an annular chain, and a pressure block 5-1 is installed on each chain plate of the chain 5-2; the chain tensioner 5-6 is installed on the baffle 5-5, and is located on the side of the annular chain 5-2 away from the workpiece.

[0047] See also Figure 2 , Fig. 9The one-step production equipment for PERT direct-buried thermal insulation pipe described in the utility model, its workpiece traction and conveying mechanism 5 is also provided with a circulating chain unit position adjustment component; the circulating chain unit position adjustment component is arranged in two groups before and after the circulating chain unit, and each group is provided with an adjustment motor 5-7, a fixed seat 5-9, a wall panel 5-8, a screw 5-10, a moving block 5-11 and a guide rail 5-12; the adjustment motor 5-7, the fixed seat 5-9 and the guide rail 5-12 are all installed on the wall panel 5-8, and the output shaft of the adjustment motor 5-7 is fastened to the screw 5-10; the screw 5-10 and the moving block 5-11 cooperate to form a screw nut transmission structure; the moving block 5-11 is fixedly assembled with the baffle 5-5 of the circulating chain unit, and a guide groove cooperating with the guide rail 5-12 is also provided on the moving block 5-11.

[0048] See also Figures 1 to 10When the utility model is used to produce the PERT direct buried thermal insulation pipe 1 in which the working pipe 1-1 is a PERT (heat-resistant polyethylene) pipe, the thermal insulation layer 1-2 is a polyurethane foam material, and the outer protective pipe 1-3 is a polyethylene sleeve by a one-step molding method, firstly, a group of prefabricated working pipes 1-1 are sleeved on the outside of the supporting rod in front of the outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine 7; the PERT direct buried thermal insulation pipe one-step production equipment is started, and the workpiece is clamped by the workpiece traction conveying mechanism 5 and moves forward, and the working pipe 1-1 moves to the infrared heating of the working pipe When the device 6 is in the working area, the outer wall of the working tube 1-1 is heated to ensure the fit between the subsequent working tube 1-1 and the polyurethane foam insulation layer 1-2. When the working tube 1-1 is extruded from the outer protective tube and passes through the insulation layer polyurethane foaming machine 7, the outer protective tube 1-3 is extruded from the outlet of the outer protective tube and the insulation layer polyurethane foaming machine 7. The outer protective tube 1-3 is sleeved on the outside of the working tube 1-1 to form an annular structure between the two. As the workpiece continues to be fed, the outer protective tube sizing and corona treatment device 8 sizing the extruded outer protective tube 1-3 through the sizing sleeve 8-1 The outer protective tube 1-3 is subjected to sizing treatment, and the inner wall of the outer protective tube 1-3 is subjected to high-voltage corona treatment with the copper wire mesh 8-2 ​​as the positive electrode and the water sprayed from the water spray pipe 8-3 as the negative electrode, so that the polymer on the inner wall of the outer protective tube 1-2 interacts with each other and the adhesion of the material is enhanced; subsequently, the foaming stock liquid is sprayed in the annulus between the outer protective tube 1-3 and the working tube 1-1 through the gun barrel of the polyurethane foaming mechanism of the outer protective tube extrusion and insulation layer polyurethane foaming machine 7, and the polyurethane insulation layer 1-2 is formed after foaming; the workpiece continues to move forward under the clamping of the workpiece traction and conveying mechanism 5. It enters the working area of ​​the cooling system 10, and enters the working area of ​​the cutting device 11 after being cooled by cooling water; when the working pipe joint position sensor 11-1 detects the joint information of the working pipe 1-1, the cutting device 11 is actuated under the command of the control system, and the workpiece is cut off at the working pipe joint position, and is transferred to the finished product area. At this time, the frontmost working pipe 1-1 runs to the back of the connection between the two adjacent supporting rod monomers, opens the connection between the two adjacent supporting rod monomers, and inserts a new working pipe 1-1 to ensure the continuous production process.

Claims

1. A PERT direct buried thermal insulation pipe, characterized in that: The PERT direct-buried thermal insulation pipe (1) uses a one-step process to complete the formation of an outer protective pipe and a thermal insulation layer outside a working pipe; the working pipe (1-1) uses a PERT pipe material, the thermal insulation layer (1-2) is a polyurethane foam layer, and the outer protective pipe (1-3) is a polyethylene casing.

2. A one-step production equipment for PERT direct buried thermal insulation pipe, characterized by: The production equipment for manufacturing the PERT direct-buried thermal insulation pipe as claimed in claim 1 is provided with a workpiece support mechanism, a workpiece traction and conveying mechanism (5), a working pipe infrared heating device (6), an outer protective pipe extrusion and thermal insulation layer polyurethane foaming machine (7), an outer protective pipe sizing and corona treatment device (8), a deviation correction device (9), a cooling system (10) and a cutting device (11); the workpiece support mechanism comprises a support seat (3) arranged on a horizontal ground and a support rod (4) sleeved inside the workpiece working pipe (1-1), the support rod is composed of a plurality of groups of support rod monomers connected in series, and runs through the front and rear ends of the production line. A hollow cylinder (4-2) matching the inner diameter of the working tube (1-1) is welded in the middle of a part of the supporting pull rod monomer; the workpiece traction and conveying mechanism (5) is arranged in two groups in front and back, and is located on both sides of the outer protective tube extrusion and thermal insulation layer polyurethane foaming machine (7); the working tube infrared heating device (6) is located in front of the outer protective tube extrusion and thermal insulation layer polyurethane foaming machine (7); the outer protective tube sizing and corona treatment device (8), the correction device (9), the cooling system (10) and the cutting device (11) are located behind the outer protective tube extrusion and thermal insulation layer polyurethane foaming machine (7), and are arranged in sequence along the workpiece conveying direction.

3. The one-step production equipment for PERT direct buried thermal insulation pipe according to claim 2 is characterized in that: A plurality of rectangular holes are provided on the side wall of the cylinder (4-2), and roller assemblies (4-3) are mounted in the rectangular holes. The roller assembly (4-3) can roll axially on the inner wall of the workpiece working tube (1-1). A roller (4-3-1), a roller shaft (4-3-2) and a roller shaft seat (4-3-3) are provided in the roller assembly (4-3); the roller (4-3-1) is rotatably mounted on the roller shaft (4-3-2), and the roller shaft (4-3-2) is mounted in the rectangular hole on the side wall of the cylinder (4-2) via the roller shaft seat (4-3-3).

4. The one-step production equipment for PERT direct buried thermal insulation pipe according to claim 3 is characterized by: A ring seat (4-4) is provided at one end of the supporting pull rod monomer, and a pull hook (4-1) is provided at the other end.

5. The one-step production equipment for PERT direct buried thermal insulation pipe according to any one of claims 2, 3 or 4, characterized in that: The support seats (3) are arranged in a plurality of groups along the workpiece conveying direction, and a support roller (3-1) is arranged on each group of support seats (3). The support roller (3-1) is a tapered roller that is thin in the middle and thick at both ends, and its contact surface with the workpiece is a V-shaped surface (3-2).

6. The one-step production equipment for PERT direct buried thermal insulation pipe according to claim 5 is characterized by: The workpiece traction conveying mechanism (5) adopts a three-claw chain conveying structure, comprising three groups of circulating chain units evenly arranged along the circumference of the outer wall of the workpiece, each group of circulating chain units is provided with a chain (5-2), a pressure block (5-1), a sprocket assembly (5-4), a reduction motor assembly (5-3) and a baffle (5-5); two groups of sprocket assemblies (5-4) are arranged in front and back, and are installed on the baffles (5-5) located on the left and right sides thereof, one of which is a driving sprocket assembly connected to the reduction motor assembly (5-3); the chain (5-2) and the two groups of sprocket assemblies (5-4) are assembled to form an annular chain, and a pressure block (5-1) is installed on each chain plate of the chain (5-2).

7. The one-step production equipment for PERT direct-buried thermal insulation pipe according to claim 6 is characterized by: A chain tensioning wheel (5-6) is also provided in each group of circulating chain units. The chain tensioning wheel (5-6) is mounted on the baffle plate (5-5) and is located on a side of the endless chain (5-2) away from the workpiece.

8. The one-step production equipment for PERT direct-buried thermal insulation pipe according to claim 7 is characterized in that: The workpiece traction conveying mechanism (5) is also provided with a circulating chain unit position adjustment component; the circulating chain unit position adjustment component is arranged in two groups before and after the circulating chain unit, and each group is provided with an adjustment motor (5-7), a fixed seat (5-9), a wall panel (5-8), a screw rod (5-10), a moving block (5-11) and a guide rail (5-12); the adjustment motor (5-7), the fixed seat (5-9) and the guide rail (5-12) are all installed on the wall panel (5-8), and the output shaft of the adjustment motor (5-7) is fastened to the screw rod (5-10); the screw rod (5-10) and the moving block (5-11) cooperate to form a screw rod nut transmission structure; the moving block (5-11) is fixedly assembled with the baffle (5-5) of the circulating chain unit, and a guide groove cooperating with the guide rail (5-12) is also provided on the moving block (5-11).

9. The one-step production equipment for PERT direct-buried thermal insulation pipe according to claim 5 is characterized by: The outer protective tube sizing and corona treatment device (8) comprises a sizing sleeve (8-1), a copper wire mesh (8-2) and a water spray pipe (8-3); the sizing sleeve (8-1) is installed at the head discharge port of the outer protective tube extrusion and insulation layer polyurethane foaming machine (7), and its outer diameter size matches the inner diameter size of the extruded outer protective tube (1-3); the copper wire mesh (8-2) is attached to the outside of the sizing sleeve (8-1) as a positive electrode for corona treatment; the water spray pipe (8-3) is located above the extruded outer protective tube (1-3) and is connected to an external water source; the water sprayed by the water spray pipe (8-3) serves as a negative electrode for corona treatment; the positive electrode and the negative electrode of the corona treatment are respectively connected to an external high-voltage power supply through wires.

10. The one-step production equipment for PERT direct-buried thermal insulation pipe according to claim 5 is characterized by: The cutting device (11) is provided with a working pipe joint position sensor (11-1), which collects joint information of two adjacent sections of working pipes (1-1) wrapped in an outer protective pipe (1-3) and a thermal insulation layer (1-2) through the working pipe joint position sensor (11-1), and then instructs the cutting device to operate through a control system to cut the continuously formed workpiece at the working pipe (1-1).

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