Buried polyvinyl chloride double-wall corrugated pipe for drainage and preparation method of buried polyvinyl chloride double-wall corrugated pipe

Abstract

The invention relates to the technical field of double-wall corrugated pipes, in particular to a polyvinyl chloride double-wall corrugated pipe for underground drainage and a preparation method of the polyvinyl chloride double-wall corrugated pipe. Through the mutual cooperation effect of the electric melting pipe fitting, the corrugated pipe body, the sealing connecting pipe, the positioning supporting mechanism and other structures which are designed to have specific structures and position relations, efficient and sealing butt joint of the polyvinyl chloride double-wall corrugated pipe end is achieved, stable supporting and positioning are provided for the double-wall corrugated pipe when the double-wall corrugated pipe is used for underground drainage, and the service life of the double-wall corrugated pipe is prolonged. Particularly, according to the structure for achieving transfer butt joint between the corrugated pipe body and the electric melting pipe fitting through the sealing connection pipe, sealing connection positioning is achieved between the sealing connection pipe and the corrugated pipe body through the hoop mechanism and the arc-shaped limiting block connected with the hoop mechanism. Synchronous and stable electric melting connection between the sealing connecting pipe and the electric melting pipe fitting is achieved by driving the bidirectional lead screw to rotate.

Description

Technical Field

[0001] The invention relates to the technical field of double-wall corrugated pipes, in particular to a polyvinyl chloride double-wall corrugated pipe for underground drainage and a preparation method thereof. Background Art

[0002] The polyvinyl chloride double-wall corrugated pipe is a new type of pipe with an annular outer wall and a smooth inner wall. In the prior art, when the polyvinyl chloride double-wall corrugated pipe is used as a drainage pipe, it needs to be laid underground and the two pipes need to be hot-melt-jointed. Since the outer wall of the double-wall corrugated pipe is annular, the stability is poor when the pipe ends are welded using the prior art. After long-term use, water leakage is likely to occur at the weld. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a polyvinyl chloride double-wall corrugated pipe for underground drainage and a preparation method thereof, so as to achieve efficient and sealed docking of the ends of the polyvinyl chloride double-wall corrugated pipe, so as to provide stable support and positioning for the double-wall corrugated pipe when used for underground drainage.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A method for preparing a double-walled polyvinyl chloride corrugated pipe for underground drainage, based on a double-walled corrugated pipe assembly, two corrugated pipe bodies, an electric fusion pipe fitting, a sealing connecting pipe and a positioning support mechanism;

[0006] The material of the bellows body is polyvinyl chloride, the inner wall of the bellows body is a smooth arc surface, and the outer wall of the bellows body is provided with a plurality of convex rings at equal intervals along the axial direction;

[0007] The sealed connecting pipe is composed of a first pipe section and a second pipe section which are distributed in a stepped manner, the outer diameter of the first pipe section is larger than the outer diameter of the second pipe section, and a sealing ring is provided at the stepped connection between the outer walls of the first pipe section and the second pipe section;

[0008] The outer diameter of the second pipe section and the inner diameter of the bellows body are interference fit or transition fit;

[0009] The electric fusion pipe fitting comprises a first bracket, a second bracket, a main body, a bidirectional screw rod, a first clamp mechanism, a guide shaft, a second clamp mechanism and a driving mechanism;

[0010] The two ends of the bidirectional screw are rotatably connected to the first bracket and the second bracket respectively, and the axial direction of the bidirectional screw is the X direction; a non-threaded section is provided in the middle of the bidirectional screw;

[0011] The main body is provided with a connecting through hole with an axial direction in the X direction, and a heating wire is arranged on the inner wall of the connecting through hole near the X-direction end and the X-direction reverse end; the outer wall of the electric fusion pipe is provided with a terminal electrically connected to the heating wire;

[0012] The main body is rotatably connected to the non-threaded section of the bidirectional screw rod via a bearing;

[0013] The driving mechanism is in transmission connection with the bidirectional screw rod and is used to drive the bidirectional screw rod to rotate;

[0014] The two ends of the guide shaft are fixedly connected to the first bracket and the second bracket respectively, and the axial direction of the guide shaft is the X direction; the main body is fixedly connected to the middle part of the guide shaft, and the axis of the guide shaft, the axis of the bidirectional screw rod and the axis of the connecting through hole of the electric fusion pipe body are located in the same plane;

[0015] The first hoop mechanism comprises a first arm and a second arm pivotally connected to each other, a threaded sleeve threadedly matched with a threaded section of a bidirectional screw rod is provided at the pivotal connection of the first arm and the second arm, the threaded sleeve is coaxially sleeved on the bidirectional screw rod, an arc-shaped notch is provided at the embracing portion of the first arm and the second arm and is clearance-matched with an outer diameter of the guide shaft, when the first arm and the second arm are embracing each other, the arc-shaped notch forms a limiting hole coaxially sleeved on the outside of the guide shaft, so that an embracing hole with an interference fit with an outer wall of the sealing connection pipe is formed on the inner side thereof, an arc-shaped limiting block is extendedly provided on the X-direction side of the first arm and the X-direction side of the second arm, and the arc-shaped limiting block is provided with a limiting portion limitingly matched with a convex ring on the outer wall of the corrugated pipe body;

[0016] The second clamp mechanism and the first clamp mechanism are mirror images of each other;

[0017] There are two positioning support mechanisms, which are symmetrically distributed on both sides of the electric fusion pipe fitting;

[0018] One of the positioning support mechanisms includes an X-guide rail connected to the first bracket, and a movable bracket slidably connected to the X-guide rail, and an arc-shaped support portion is provided on the upper portion of the movable bracket to limit the engagement with the convex ring on the outer wall of the bellows body;

[0019] The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage comprises the following steps:

[0020] The inner walls of one end of the two bellows bodies are respectively connected to the second pipe section of the sealing connection pipe, so that the sealing ring abuts against the end of the bellows body;

[0021] The control driving mechanism drives the bidirectional screw rod to rotate, so that the first clamp mechanism and the second clamp mechanism move away from the electric fusion pipe fitting synchronously;

[0022] The convex rings in the middle of the two bellows bodies are mounted on the arc-shaped support part of the movable bracket, and the movable bracket is controlled to move along the X-direction guide rail so that the sealing connecting pipe connected to the end of the bellows body extends into the embracing position of the first embracing hoop mechanism, or extends into the embracing position of the second embracing hoop mechanism;

[0023] The sealing connection pipes connected to the ends of the two bellows bodies are respectively embraced by the first and second hoop mechanisms, and the convex ring on the outer side of the bellows body is embraced by the arc-shaped limit block, so that under the extrusion and limiting action of the arc-shaped limit block, an axial extrusion force toward the sealing ring is generated between the sealing connection pipe and the bellows body;

[0024] The control driving mechanism drives the bidirectional screw rod to rotate in the opposite direction, so that the first clamp mechanism and the second clamp mechanism move toward each other synchronously; the movable bracket is driven to move along the X-direction guide rail, and at the same time, the two terminals are connected to the power supply to make the heating wire energized and heated, so that the first pipe section of the sealed connecting pipe connected by the first clamp mechanism and the second clamp mechanism slowly extends into the connecting through hole of the electric fusion pipe fitting, so that the outer wall of the first pipe section and the inner wall of the connecting through hole are hot-melt connected.

[0025] Furthermore, in the above-mentioned method for preparing the buried polyvinyl chloride double-wall corrugated pipe for drainage, a ring-shaped limiting convex edge is provided in the middle of the inner wall of the connecting through hole of the main body;

[0026] In the preparation method of the buried polyvinyl chloride double-wall corrugated pipe for drainage, after the outer wall of the first pipe section and the inner wall of the connecting through hole are connected by hot-melt, the pipe end of the sealed connecting pipe abuts against the limiting convex edge.

[0027] Furthermore, in the above-mentioned preparation method of the polyvinyl chloride double-wall corrugated pipe for buried drainage, the shape of the first bracket is a U-shape formed by vertically connecting two vertical bars and a horizontal bar, the shape of the second bracket is the same as that of the first bracket, the horizontal bar parts of the first bracket and the second bracket are supported on the ground, and the X-guide rail is fixedly connected to the horizontal bar.

[0028] Furthermore, in the above-mentioned method for preparing the polyvinyl chloride double-wall corrugated pipe for underground drainage, the driving mechanism includes a driving shaft, a first bevel gear and a second bevel gear;

[0029] The first bevel gear is coaxially sleeved on the non-threaded section in the middle of the bidirectional screw rod, the two ends of the drive shaft are rotatably connected between the electric fusion pipe body and the second bracket, the second bevel gear is coaxially connected to the drive shaft, and the second bevel gear is meshed with the first bevel gear.

[0030] Furthermore, in the above-mentioned method for preparing the polyvinyl chloride double-wall corrugated pipe for underground drainage, a rotating hand wheel is connected to the end of the driving shaft.

[0031] Furthermore, in the above-mentioned preparation method of the polyvinyl chloride double-wall corrugated pipe for buried drainage, the X-direction guide rail includes a support plate and two X-direction linear grooves arranged on the upper part of the support plate, and the bottom of the movable bracket is provided with more than 4 rollers that roll with the linear grooves.

[0032] The present invention also protects the buried polyvinyl chloride double-wall corrugated pipe for underground drainage made by the preparation method of the buried polyvinyl chloride double-wall corrugated pipe for underground drainage.

[0033] The beneficial effects of the present invention are as follows: by designing the electric fusion pipe fittings, the corrugated pipe body, the sealing connection pipe and the positioning support mechanism with specific structures and positional relationships, the efficient and sealed docking of the ends of the polyvinyl chloride double-wall corrugated pipes can be achieved, so that when used for buried drainage, stable support and positioning can be provided for the double-wall corrugated pipes, especially the structure of the transit docking between the corrugated pipe body and the electric fusion pipe fitting is realized by using the sealing connection pipe, the sealing connection positioning between the sealing connection pipe and the corrugated pipe body is realized by using the clamp mechanism and the arc-shaped limit block connected thereto, and the synchronous and stable electric fusion connection between the sealing connection pipe and the electric fusion pipe fitting is realized by driving the two-way screw to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A top view of a polyvinyl chloride double-wall corrugated pipe for underground drainage according to a specific embodiment of the present invention;

[0035] Figure 2 for Figure 1 AA cross-section diagram;

[0036] Figure 3 for Figure 2 A magnified view of part B;

[0037] Figure 4 It is a structural schematic diagram of a polyvinyl chloride double-wall corrugated pipe for underground drainage according to a specific embodiment of the present invention;

[0038] Figure 5 for Figure 4 Enlarged view of part C;

[0039] Description of labels:

[0040] 1. Bellows body; 11. Convex ring;

[0041] 2. Electric fusion pipe fittings; 21. First bracket; 211. Vertical rod; 212. Cross rod; 22. Second bracket; 23. Main body; 231. Connecting through hole; 232. Heating wire; 233. Terminal post; 234. Position limiting convex edge; 24. Bidirectional screw rod; 25. First clamp mechanism; 251. First clamp arm; 252. Second clamp arm; 253. Threaded sleeve; 254. Arc notch; 255. Arc position limiting block; 26. Second clamp mechanism; 27. Driving mechanism; 271. Driving shaft; 272. First bevel gear; 273. Second bevel gear; 274. Rotating hand wheel; 28. Guide shaft;

[0042] 3. Sealing connecting pipe; 31. First pipe section; 32. Second pipe section; 33. Sealing ring;

[0043] 4. Positioning support mechanism; 41. X-guide rail; 411. Support plate; 412. Linear groove; 42. Moving bracket; 421. Arc support part; 422. Roller. DETAILED DESCRIPTION

[0044] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0045] Please refer to Figures 1 to 5 , the specific embodiment of the present invention relates to a method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage, based on a double-wall corrugated pipe assembly, two corrugated pipe bodies 1, an electric fusion pipe fitting 2, a sealing connecting pipe 3 and a positioning support mechanism 4;

[0046] The material of the bellows body 1 is polyvinyl chloride, the inner wall of the bellows body 1 is a smooth arc surface, and the outer wall of the bellows body 1 is provided with a plurality of convex rings 11 at equal intervals along the axial direction;

[0047] The sealing connection pipe 3 is composed of a first pipe section 31 and a second pipe section 32 which are distributed in a stepped manner. The outer diameter of the first pipe section 31 is larger than the outer diameter of the second pipe section 32. A sealing ring 33 is provided at the stepped connection between the outer walls of the first pipe section 31 and the second pipe section 32.

[0048] The outer diameter of the second pipe section 32 is interference fit or transition fit with the inner diameter of the bellows body 1;

[0049] The electric fusion pipe fitting 2 includes a first bracket 21, a second bracket 22, a main body 23, a bidirectional screw rod 24, a first clamp mechanism 25, a guide shaft 28, a second clamp mechanism 26 and a driving mechanism 27;

[0050] The two ends of the bidirectional screw rod 24 are rotatably connected to the first bracket 21 and the second bracket 22 respectively, and the axial direction of the bidirectional screw rod 24 is the X direction; the middle part of the bidirectional screw rod 24 is provided with a non-threaded section;

[0051] The main body 23 is provided with a connecting through hole 231 with an axial direction in the X direction, and a heating wire 232 is arranged on the inner wall of the connecting through hole 231 near the X-direction end and near the X-direction reverse end; the outer wall of the electric fusion pipe 2 is provided with a terminal 233 conductively connected to the heating wire 232;

[0052] The main body 23 is rotatably connected to the non-threaded section of the bidirectional screw rod 24 via a bearing;

[0053] The driving mechanism 27 is in transmission connection with the bidirectional screw rod 24 and is used to drive the bidirectional screw rod 24 to rotate;

[0054] The two ends of the guide shaft 28 are fixedly connected to the first bracket 21 and the second bracket 22 respectively, and the axial direction of the guide shaft 28 is the X direction; the main body 23 is fixedly connected to the middle part of the guide shaft 28, and the axis of the guide shaft 28, the axis of the bidirectional screw rod 24 and the axis of the connecting through hole 231 of the main body of the electric fusion pipe fitting 2 are located in the same plane;

[0055] The first clamp mechanism 25 comprises a first clamp arm 251 and a second clamp arm 252 which are pivotally connected to each other. A threaded sleeve 253 which is threadably matched with the threaded section of the bidirectional screw rod 24 is provided at the pivotal position of the first clamp arm 251 and the second clamp arm 252. The threaded sleeve 253 is coaxially sleeved on the bidirectional screw rod 24. An arc-shaped notch 254 which is clearance-matched with the outer diameter of the guide shaft 28 is provided at the clamping portion of the first clamp arm 251 and the second clamp arm 252. When the first clamp arm 251 and the second clamp arm 252 are mutually clamped, the arc-shaped notch 254 forms a limiting hole which is coaxially sleeved on the outside of the guide shaft 28, so that an inner side thereof forms a clamping hole which is interference-matched with the outer wall of the sealing connection pipe 3. An arc-shaped limiting block 255 is extended from the X-direction side of the first clamp arm 251 and the X-direction side of the second clamp arm 252. The arc-shaped limiting block 255 is provided with a limiting portion which is limit-matched with the convex ring 11 on the outer wall of the corrugated pipe body 1.

[0056] The second clamp mechanism 26 and the first clamp mechanism 25 are mirror images of each other;

[0057] There are two positioning support mechanisms 4, which are symmetrically distributed on both sides of the electric fusion pipe 2;

[0058] One of the positioning support mechanisms 4 includes an X-direction guide rail 41 connected to the first bracket 21, and a movable bracket 42 slidably connected to the X-direction guide rail 41, and an arc-shaped support portion 421 is provided on the upper portion of the movable bracket 42 to limit the engagement with the convex ring 11 on the outer wall of the bellows body 1;

[0059] The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage comprises the following steps:

[0060] The inner walls of one end of the two bellows bodies 1 are respectively connected to the second pipe section 32 of the sealing connecting pipe 3, so that the sealing ring 33 abuts against the end of the bellows body 1;

[0061] The control driving mechanism 27 drives the bidirectional screw rod 24 to rotate, so that the first clamp mechanism 25 and the second clamp mechanism 26 move away from the electric fusion pipe fitting 2 synchronously;

[0062] The convex rings 11 in the middle of the two bellows bodies 1 are mounted on the arc-shaped support portion 421 of the movable bracket 42, and the movable bracket 42 is controlled to move along the X-direction guide rail 41, so that the sealing connecting pipe 3 connected to the end of the bellows body 1 extends into the embracing position of the first embracing hoop mechanism 25, or extends into the embracing position of the second embracing hoop mechanism 26;

[0063] The sealing connection pipe 3 connected to the ends of the two bellows bodies 1 is respectively embraced by the first and second hoop mechanisms 25 and 26, and the convex ring 11 on the outer side of the bellows body 1 is embraced by the arc-shaped limit block 255, so that under the extrusion and limiting action of the arc-shaped limit block 255, an axial extrusion force toward the sealing ring 33 is generated between the sealing connection pipe 3 and the bellows body 1;

[0064] The control driving mechanism 27 drives the bidirectional screw rod 24 to rotate in the opposite direction, so that the first clamp mechanism 25 and the second clamp mechanism 26 move toward each other synchronously; drives the movable bracket 42 to move along the X-direction guide rail 41, and at the same time, connects the two connecting posts 233 to the power supply, so that the heating wire 232 is energized and heated, so that the first pipe section 31 of the sealed connecting pipe 3 connected by the first clamp mechanism 25 and the second clamp mechanism 26 slowly extends into the connecting through hole 231 of the electric fusion pipe fitting 2, so that the outer wall of the first pipe section 31 and the inner wall of the connecting through hole 231 are hot-melt connected.

[0065] In the above embodiment, in order to make the inner wall of the sealing connecting pipe 3 and the inside of the corrugated pipe body 1 more smoothly docked, a chamfering mechanism is provided at the end of the second pipe section 32 of the sealing connecting pipe 3 to reduce the turbulence generated when the drainage water flows through the connection between the second pipe section 32 and the corrugated pipe body 1.

[0066] In the above implementation manner, by designing the electric fusion pipe fitting 2, the corrugated pipe body 1, the sealing connection pipe 3 and the positioning support mechanism 4 with specific structures and positional relationships, the efficient and sealed docking of the ends of the polyvinyl chloride double-wall corrugated pipe is achieved, so that when it is used for buried drainage, a stable support and positioning is provided for the double-wall corrugated pipe. In particular, the sealing connection pipe 3 is used to realize the structure of the transit docking between the corrugated pipe body 1 and the electric fusion pipe fitting 2, and the sealing connection positioning between the sealing connection pipe 3 and the corrugated pipe body 1 is realized by the clamp mechanism and the arc-shaped limit block 255 connected thereto, and the synchronous and stable electric fusion connection between the sealing connection pipe 3 and the electric fusion pipe fitting 2 is realized by driving the bidirectional screw 24 to rotate.

[0067] As a preferred embodiment, a ring-shaped limiting convex edge 234 is provided in the middle of the inner wall of the connecting through hole 231 of the main body 23;

[0068] In the preparation method of the buried polyvinyl chloride double-wall corrugated pipe for drainage, after the outer wall of the first pipe section 31 and the inner wall of the connecting through hole 231 are hot-melt connected, the pipe end of the sealing connecting pipe 3 is pressed against the limiting convex edge 234.

[0069] In the above embodiment, by setting the limiting convex edge 23434, the moving end position of the sealed connecting pipe 3 is positioned to prevent the plastic pipe from being inserted too deeply, and the transition between the electric fusion pipe fitting 2 and the inner wall of the sealed connecting pipe 3 is smoother, so that the turbulence generated when the drainage water flows through the connection between the first pipe section 31 and the electric fusion pipe fitting 2 is reduced.

[0070] As a preferred embodiment, the shape of the first bracket 21 is a U-shape formed by vertically connecting two vertical rods 211 and a horizontal rod 212, the shape of the second bracket 22 is the same as that of the first bracket 21, the horizontal rod 212 parts of the first bracket 21 and the second bracket 22 are supported on the ground, and the X-guide rail 41 is fixedly connected to the horizontal rod 212.

[0071] As a preferred embodiment, the driving mechanism 27 includes a driving shaft 271, a first bevel gear 272 and a second bevel gear 273;

[0072] The first bevel gear 272 is coaxially sleeved on the non-threaded section in the middle of the bidirectional screw rod 24 , and the two ends of the drive shaft 271 are rotatably connected between the main body 23 of the electric fusion pipe fitting 2 and the second bracket 22 , respectively. The second bevel gear 273 is coaxially connected to the drive shaft 271 , and the second bevel gear 273 is meshed with the first bevel gear 272 .

[0073] As a preferred embodiment, a rotating hand wheel 274 is connected to the end of the driving shaft 271 .

[0074] As a preferred embodiment, the X-direction guide rail 41 includes a support plate 411 and two X-direction linear grooves 412 arranged on the upper portion of the support plate 411 , and the bottom of the movable bracket 42 is provided with more than four rollers 422 that roll with the linear grooves 412 .

[0075] The specific implementation manner of the present invention also relates to a polyvinyl chloride double-wall corrugated pipe for underground drainage made by the preparation method of the polyvinyl chloride double-wall corrugated pipe for underground drainage.

[0076] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage, characterized in that: Based on double-walled corrugated pipe assembly, two corrugated pipe bodies, electric fusion pipe fittings, sealing connecting pipes and positioning support mechanisms; The material of the bellows body is polyvinyl chloride, the inner wall of the bellows body is a smooth arc surface, and the outer wall of the bellows body is provided with a plurality of convex rings at equal intervals along the axial direction; The sealed connecting pipe is composed of a first pipe section and a second pipe section which are distributed in a stepped manner, the outer diameter of the first pipe section is larger than the outer diameter of the second pipe section, and a sealing ring is provided at the stepped connection between the outer walls of the first pipe section and the second pipe section; The outer diameter of the second pipe section and the inner diameter of the bellows body are interference fit or transition fit; The electric fusion pipe fitting comprises a first bracket, a second bracket, a main body, a bidirectional screw rod, a first clamp mechanism, a guide shaft, a second clamp mechanism and a driving mechanism; The two ends of the bidirectional screw are rotatably connected to the first bracket and the second bracket respectively, and the axial direction of the bidirectional screw is the X direction; a non-threaded section is provided in the middle of the bidirectional screw; The main body is provided with a connecting through hole with an axial direction in the X direction, and a heating wire is arranged on the inner wall of the connecting through hole near the X-direction end and the X-direction reverse end; the outer wall of the electric fusion pipe is provided with a terminal electrically connected to the heating wire; The main body is rotatably connected to the non-threaded section of the bidirectional screw rod via a bearing; The driving mechanism is in transmission connection with the bidirectional screw rod and is used to drive the bidirectional screw rod to rotate; The two ends of the guide shaft are fixedly connected to the first bracket and the second bracket respectively, and the axial direction of the guide shaft is the X direction; the main body is fixedly connected to the middle part of the guide shaft, and the axis of the guide shaft, the axis of the bidirectional screw rod and the axis of the connecting through hole of the electric fusion pipe body are located in the same plane; The first hoop mechanism comprises a first arm and a second arm pivotally connected to each other, a threaded sleeve threadedly matched with a threaded section of a bidirectional screw rod is provided at the pivotal connection of the first arm and the second arm, the threaded sleeve is coaxially sleeved on the bidirectional screw rod, an arc-shaped notch is provided at the embracing portion of the first arm and the second arm and is clearance-matched with an outer diameter of the guide shaft, when the first arm and the second arm are embracing each other, the arc-shaped notch forms a limiting hole coaxially sleeved on the outside of the guide shaft, so that an embracing hole with an interference fit with an outer wall of the sealing connection pipe is formed on the inner side thereof, an arc-shaped limiting block is extendedly provided on the X-direction side of the first arm and the X-direction side of the second arm, and the arc-shaped limiting block is provided with a limiting portion limitingly matched with a convex ring on the outer wall of the corrugated pipe body; The second clamp mechanism and the first clamp mechanism are mirror images of each other; There are two positioning support mechanisms, which are symmetrically distributed on both sides of the electric fusion pipe fitting; One of the positioning support mechanisms includes an X-guide rail connected to the first bracket, and a movable bracket slidably connected to the X-guide rail, and an arc-shaped support portion is provided on the upper portion of the movable bracket to limit the engagement with the convex ring on the outer wall of the bellows body; The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage comprises the following steps: The inner walls of one end of the two bellows bodies are respectively connected to the second pipe section of the sealing connection pipe, so that the sealing ring abuts against the end of the bellows body; The control driving mechanism drives the bidirectional screw rod to rotate, so that the first clamp mechanism and the second clamp mechanism move away from the electric fusion pipe fitting synchronously; The convex rings in the middle of the two bellows bodies are mounted on the arc-shaped support part of the movable bracket, and the movable bracket is controlled to move along the X-direction guide rail so that the sealing connecting pipe connected to the end of the bellows body extends into the embracing position of the first embracing hoop mechanism, or extends into the embracing position of the second embracing hoop mechanism; The sealing connection pipes connected to the ends of the two bellows bodies are respectively embraced by the first and second hoop mechanisms, and the convex ring on the outer side of the bellows body is embraced by the arc-shaped limit block, so that under the extrusion and limiting action of the arc-shaped limit block, an axial extrusion force toward the sealing ring is generated between the sealing connection pipe and the bellows body; The control driving mechanism drives the bidirectional screw rod to rotate in the opposite direction, so that the first clamp mechanism and the second clamp mechanism move toward each other synchronously; the movable bracket is driven to move along the X-direction guide rail, and at the same time, the two terminals are connected to the power supply to make the heating wire energized and heated, so that the first pipe section of the sealed connecting pipe connected by the first clamp mechanism and the second clamp mechanism slowly extends into the connecting through hole of the electric fusion pipe fitting, so that the outer wall of the first pipe section and the inner wall of the connecting through hole are hot-melt connected.

2. The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage according to claim 1, characterized in that: A ring-shaped limiting convex edge is provided in the middle of the inner wall of the connecting through hole of the main body; In the preparation method of the buried polyvinyl chloride double-wall corrugated pipe for drainage, after the outer wall of the first pipe section and the inner wall of the connecting through hole are connected by hot-melt, the pipe end of the sealed connecting pipe abuts against the limiting convex edge.

3. The method for preparing the polyvinyl chloride double-wall corrugated pipe for underground drainage according to claim 1, characterized in that: The first bracket is in a U-shape formed by vertically connecting two vertical bars and a horizontal bar. The second bracket has the same shape as the first bracket. The horizontal bar portions of the first bracket and the second bracket are supported on the ground, and the X-guide rail is fixedly connected to the horizontal bar.

4. The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage according to claim 1, characterized in that: The driving mechanism comprises a driving shaft, a first bevel gear and a second bevel gear; The first bevel gear is coaxially sleeved on the non-threaded section in the middle of the bidirectional screw rod, the two ends of the drive shaft are rotatably connected between the electric fusion pipe body and the second bracket, the second bevel gear is coaxially connected to the drive shaft, and the second bevel gear is meshed with the first bevel gear.

5. The method for preparing the polyvinyl chloride double-wall corrugated pipe for underground drainage according to claim 4, characterized in that: The end of the driving shaft is connected with a rotating hand wheel.

6. The method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage according to claim 1, characterized in that: The X-direction guide rail includes a support plate and two linear grooves arranged in the X direction on the upper part of the support plate. The bottom of the movable bracket is provided with more than four rollers that roll with the linear grooves.

7. A polyvinyl chloride double-wall corrugated pipe for underground drainage obtained by the method for preparing a polyvinyl chloride double-wall corrugated pipe for underground drainage according to any one of claims 1 to 6.

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