Production method of winding structure wall pipe with pre-embedded optical fiber and pipe

Abstract

The invention discloses a production method of a winding structure wall pipe with an embedded optical fiber and the pipe. The production method comprises the following steps: preparing a strip: coating the optical fiber with a raw material through an extruder, extruding the strip, cooling the strip and rolling the strip into a disc; the coiled strip is unwound, and the end of the strip penetrates through a heating sleeve and then is fixed to a first fixing ring; the coiled strip is translated in the axial direction of a pipe forming cage, the pipe forming cage rotates, the strip is spirally wound in the axial direction of the pipe forming cage, and the other end of the strip is fixed to a second fixing ring; closing the mold and performing hot melting; the upper mold body located above the pipe forming cage and the lower mold body located below the pipe forming cage are mutually closed, the upper mold body, the lower mold body and the pipe forming cage heat the joint part of the strip, and the spirally wound strip is hot-melted and mutually connected to form the pipe. The optical fiber wound on the outer wall of the pipe can early warn and accurately monitor the problems of leakage, deformation, cracking and the like of the pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe manufacturing technology, and more specifically, to a method for producing a spiral-wound structural wall pipe with pre-embedded optical fibers and the pipe itself. Background Technology

[0002] At the national level, numerous policies have been introduced to promote the digital and intelligent management of urban infrastructure, explicitly requiring strengthened information management of underground pipe networks and the construction of a unified management information system. Against this backdrop, refined management of drainage pipe networks has become a key task in urban infrastructure construction. Its digitalization and intelligentization are important components of smart city construction, requiring advanced technologies to improve management efficiency, reduce costs, and enhance emergency response capabilities. Currently, the industry constructs a control system by installing monitoring equipment at key nodes in the drainage pipe network. However, existing monitoring technologies only cover nodes such as pipe and fitting connections; the pipe system itself cannot be continuously monitored, making it difficult to provide early warnings and accurate monitoring of problems such as leakage, deformation, and cracking of the pipes themselves. This fails to meet the monitoring needs for the safe and stable operation of drainage pipe networks. Therefore, a technological solution is needed to address these issues. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art, to pre-embed optical fibers into the pipe, to provide early warning and accurate monitoring of problems such as leakage, deformation and cracking of the pipe itself, and to provide a method for producing a wound structure wall pipe with pre-embedded optical fibers and the pipe itself.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention discloses a method for producing a spiral-wound structural wall tube with pre-embedded optical fibers, comprising the following steps:

[0006] S1. Preparation of tape: The raw material is coated with optical fiber and extruded into tape using an extruder. The tape is cooled and wound into a coil.

[0007] S2. Strip preheating: The coiled strip is unwound, and the end of the strip passes through the heating sleeve and is fixed to the first fixing ring at the end of the tube forming cage.

[0008] S3. Strip winding: The coiled strip moves along the axial direction of the tube forming cage, and the tube forming cage rotates synchronously, so that the strip is spirally wound along the axial direction of the tube forming cage. The other end of the strip is fixed on the second fixing ring at the rear end of the tube forming cage.

[0009] S4. Mold closing and hot melting: The upper mold body located above the tube forming cage and the lower mold body located below the tube forming cage close together. The upper mold body, the lower mold body, and the tube forming cage heat the spiral joint of the strip. The spirally wound strip is hot-melted and connected to form a tube.

[0010] Furthermore, the tape includes a sheet and a wire, the sheet and the wire are integrally formed, the wire is located on one outer side of the sheet, the inner side of the sheet serves as the inner wall of the tube, and the wire is covered with optical fiber.

[0011] Furthermore, the first fixing ring is installed at the front end of the tube forming cage. The first fixing ring includes a first spiral surface, which is located on the side of the first fixing ring facing the rear end of the tube forming cage. The slope of the first spiral surface corresponds to the slope of the spiral winding of the strip.

[0012] Furthermore, the first fixing ring includes a first limiting plate, and a slot is formed between the first limiting plate and the outer wall of the pipe forming cage. The portion of the sheet body near the first fixing ring is inserted between the first limiting plate and the outer wall of the pipe forming cage. A first locking rod installed on the first limiting plate fixes the sheet body and the first limiting plate.

[0013] Furthermore, the first fixing ring includes a first stop surface that abuts against the front end of the sheet body, and the second fixing ring includes a second stop surface that abuts against the rear end of the sheet body.

[0014] Furthermore, the first fixing ring includes a first groove that communicates with the first stop surface, and the second fixing ring includes a second groove that communicates with the second stop surface.

[0015] Furthermore, in step S3, after the rear end of the strip is fixed to the second fixing ring, the second fixing ring is rotated along the spiral direction of the strip to tighten the rear end of the strip. The pressure ring approaches the second fixing ring along the axial direction of the tube forming cage, and the pressure ring abuts against the second fixing ring. The second fixing ring is fixedly connected to the pressure ring by bolts.

[0016] Furthermore, the upper mold body includes an upper mold pressing strip, and the lower mold body includes a lower mold pressing strip, the upper mold pressing strip and the lower mold pressing strip corresponding to the spiral joint of the strip.

[0017] Furthermore, the sheet includes a first connecting portion and a second connecting portion, which are located on the left and right sides of the sheet, respectively. The spirally wound sheet connects the first connecting portion and the second connecting portion at the front and rear positions.

[0018] The present invention also discloses a tubing material manufactured using the above-mentioned method for producing a spiral-wound structured wall tubing material with pre-embedded optical fibers. The tubing material includes a spirally wound wire on its outer wall, the wire being integrally formed with the tubing material, a portion of optical fiber being wrapped inside the wire, both ends of the optical fiber extending out of the wire, and connectors being installed at both ends of the optical fiber.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention uses an extruder to form a tape that coats optical fibers in one step, and then uses a spiral winding + die-fitting hot-melt method to prepare a tube. This achieves integrated forming of optical fibers and tubes, avoiding the cumbersome process of threading optical fibers later, while ensuring a tight connection between the optical fibers and tubes and preventing damage.

[0021] 2. The strip in this invention has a convex-concave mating joint, which ensures precise alignment during winding and high joint strength after hot melting after mold closing, thus guaranteeing the overall mechanical properties of the pipe.

[0022] 3. The process of the present invention achieves precise positioning and firm fixation of the strip end through the special structural design of the first fixing ring and the second fixing ring, avoiding the strip from loosening or shifting during the winding process and ensuring the forming accuracy of the tube.

[0023] 4. The pipe prepared by this invention has a built-in embedded optical fiber, which can realize continuous real-time monitoring of the entire length of the pipe through equipment such as optical time domain reflectometer, accurately locate the fault location such as leakage, deformation, and cracking, perfectly meeting the national policy requirements for the informatization and intelligent management of urban underground pipe networks. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of this embodiment.

[0025] Figure 2 This is a cross-sectional view of the strip in this embodiment.

[0026] Figure 3 This is a schematic diagram of strip winding in this embodiment.

[0027] Figure 4 This is a schematic diagram of the first fixing ring in this embodiment.

[0028] Figure 5 This is a schematic diagram of the rear end of the tube forming cage in this embodiment.

[0029] Figure 6 This is a schematic diagram of a type of pipe in this embodiment.

[0030] Reference numerals: 1. Strip; 11. Sheet; 111. First joint; 112. Second joint; 12. Wire; 13. Optical fiber; 14. Connector; 2. Tube forming cage; 21. Heating wire; 3. First fixing ring; 31. First spiral surface; 32. First limiting plate; 321. First locking rod; 33. First groove; 34. First stop surface; 4. Second fixing ring; 41. Second spiral surface; 42. Second limiting plate; 421. Second locking rod; 43. Second groove; 44. Second stop surface; 5. Pressure ring; 6. Limiting seat; 7. Upper mold body; 71. Upper mold pressure strip; 72. Insertion groove; 8. Lower mold body; 81. Lower mold pressure strip; 82. Insertion block; 101. Tube. Detailed Implementation

[0031] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figures 1-5 As shown, this embodiment discloses a method for producing a wound-walled tube with pre-embedded optical fibers, specifically including the following steps:

[0034] S1. Preparation of strip material:

[0035] Polyethylene (PE) is selected as the raw material for strip 1. This raw material has excellent heat melt properties, corrosion resistance and mechanical strength, and is suitable for making pipes. The PE raw material is added to the main hopper of the extruder, and the optical fiber 13 is introduced from the feed channel of the extrusion die. The optical fiber 13 is centered on the wire body 12 of strip 1 along the extrusion direction. The barrel temperature of the extruder is set to 180-220℃ and the die temperature is set to 200-230℃. Through the extrusion of the die, the molten PE raw material is coated on the outside of the optical fiber 13, and strip 1 is formed in one extrusion. After the strip 1 is extruded, it is quickly cooled to room temperature in a cooling water tank. The cooling water temperature is controlled at 20-30℃ to avoid deformation of strip 1. Then it is wound into a coil by a winding machine. The winding tension is controlled at 50-80N to prevent the strip 1 from being stretched or the optical fiber 13 from being damaged.

[0036] In this embodiment, the strip 1 includes an integrally formed sheet 11 and a wire 12. The wire 12 is located on the outside of the sheet 11 (i.e., the side that forms the outer wall of the tube 101 after winding). The cross-section of the wire 12 is circular, and the inside is covered with optical fiber 13. The left and right sides of the sheet 11 are respectively provided with a first joint 111 and a second joint 112. The first joint 111 is a boss structure, and the second joint 112 is a groove structure that matches the boss. The thickness / height of the boss and the groove are both half the thickness of the sheet 11, which facilitates the precise docking of the strip 1 that is spirally wound front and back during subsequent winding.

[0037] S2. Strip preheating:

[0038] The coiled strip 1 is mounted on an unwinding frame, which is installed on a track. The unwinding frame moves axially along the tube forming cage 2 while unwinding. The tension of the unwinding frame is adjustable and matches the winding tension, maintaining 50-80N to prevent slack or stretching of the strip 1 during unwinding. The end of the strip 1 is preheated by passing through a heating sleeve, which uses electric heating. The preheating temperature is set to 80-100℃, and the preheating length is 300-500mm. Preheating improves the flexibility of the strip 1, facilitating subsequent winding and forming, and enhancing the effect of subsequent hot-melt bonding. After preheating, the front end of the strip 1 is fixed to the first fixing ring 3 at the end of the tube forming cage 2.

[0039] The tube forming cage 2 is a cylindrical structure, with its diameter determined according to the inner diameter of the tube 101 to be produced. The tube forming cage 2 is made of 45# steel and chrome-plated to reduce the coefficient of friction with the strip 1. A first fixing ring 3 is installed at the front end of the tube forming cage 2, including a first spiral surface 31, a first limiting plate 32, a first groove 33, and a first stop surface 34. The first spiral surface 31 is located on the side of the first fixing ring 3 facing the rear end of the tube forming cage 2, and its slope corresponds perfectly to the slope of the spiral winding of the strip 1, ensuring that the end of the strip 1 can smoothly adhere to the tube forming cage 2 to begin winding. A slot is formed between the first limiting plate 32 and the outer wall of the tube forming cage 2, and the sheet 11... The portion near the first fixing ring 3 is inserted into the slot. Two symmetrically arranged first locking rods 321 are installed on the first limiting plate 32. The first locking rods 321 are locked with bolts. By tightening the first locking rods 321, the sheet 11 is fixed to the first limiting plate 32 to prevent the end of the strip 1 from loosening. The first stop surface 34 is perpendicular to the axial direction of the tube forming cage 2 and abuts against the front end of the sheet 11 to achieve axial positioning of the strip 1. The first groove 33 is connected to the first stop surface 34. The width of the first groove 33 is greater than the diameter of the optical fiber 13. The front and rear ends of the strip 1 are provided with outwardly extending optical fibers 13. The first groove 33 is used to accommodate the end of the optical fiber 13 to prevent the optical fiber 13 from being bent under pressure.

[0040] S3, Strip winding:

[0041] The front end of the tube forming cage 2, with the end of the strip 1 fixed, is axially connected to the winding machine driven by the motor. At the same time, the relative position of the unwinding frame and the tube forming cage 2 is adjusted, and the winding machine is started. The coiled strip 1 is moved at a uniform speed along the axis of the tube forming cage 2 with the unwinding frame. At the same time, the tube forming cage 2 rotates at a uniform speed. By matching the translation speed and the rotation speed, the strip 1 is spirally wound along the axis of the tube forming cage 2. During the winding process, the first joint 111 and the second joint 112 of the strip 1 are precisely connected to ensure tight winding without gaps.

[0042] When the strip 1 is spirally wound to the rear end of the tube forming cage 2, the other end of the strip 1 is manually fixed to the second fixing ring 4 at the rear end of the tube forming cage 2. The structure of the second fixing ring 4 is the same as that of the first fixing ring 3, including a second spiral surface 41, a second limiting plate 42, a second groove 43, and a second stop surface 44. The second spiral surface 41 is located on the side of the second fixing ring 4 facing the front end of the tube forming cage 2, and its slope corresponds exactly to the slope of the spiral winding of the strip 1. The slot formed between the second limiting plate 42 and the outer wall of the tube forming cage 2 is inserted into the slot of the sheet 11 near the second fixing ring 4. Two symmetrically arranged... The second locking rod 421 is bolted and tightened to fix the sheet 11 to the second limiting plate 42, preventing the rear end of the strip 1 from loosening. The second stop surface 44 abuts against the rear end of the sheet 11 to achieve axial positioning of the rear end of the strip 1. The second groove 43 connects to the second stop surface 44. The width of the first groove 33 is greater than the diameter of the optical fiber 13. The front and rear ends of the strip 1 are provided with outwardly extending optical fibers 13. The second groove 43 is used to accommodate the rear end of the optical fiber 13 to prevent the optical fiber 13 from being bent under pressure. The second fixing ring 4 and the tube forming cage 2 are in sliding fit, which facilitates the adjustment of position and tightening of the strip 1 after winding.

[0043] After fixing, the second fixing ring 4 is manually rotated along the spiral direction of the strip 1, and during the rotation, the second fixing ring 4 is brought closer to the strip 1 to tighten the rear end of the strip 1. Then, the pressure ring 5 is brought closer to the second fixing ring 4 along the axial direction of the tube forming cage 2. The rear end of the tube forming cage 2 includes a limiting seat 6. The second fixing ring 4 is moved away from the limiting seat 6 by adjusting the screw, so that the pressure ring 5 tightly abuts against the second fixing ring 4. The second fixing ring 4 and the pressure ring 5 are fixedly connected by three evenly distributed bolts to prevent the wrapped strip 1 from loosening. The limiting seat 6 is axially rotated and installed on the bracket, so that the rear end of the tube forming cage 2 is rotated and connected.

[0044] To make the hot-melt connection between the front and rear strips 1 more secure, another small extruder can be set up to extrude hot-melt material at the joint of the strip 1 during the winding process. The extrusion end of the extruder is close to the joint of the outer wall of the already wound strip 1. The extruder can move in the same direction as the winding machine. By matching the translation speed with the rotation speed, the hot-melt material is evenly spirally applied to the joint of the wound strip 1 as the tube forming cage 2 rotates. The hot-melt material is then melted and squeezed into the gap between the strips 1 by the subsequent mold closing and hot pressing, filling the gap between the strips 1 and making the hot-melt bonding effect of the strips 1 better.

[0045] S4, Mold closing heat fusion:

[0046] After the strip 1 is wound and fixed, the positions of the upper mold body 7 and the lower mold body 8 are adjusted so that the upper mold body 7 is above the tube forming cage 2 and the lower mold body 8 is below the tube forming cage 2. Both the upper mold body 7 and the lower mold body 8 adopt a semi-circular structure. The inner side of the upper mold body 7 is provided with an upper mold pressure strip 71 and the inner side of the lower mold body 8 is provided with a lower mold pressure strip 81. The shapes of the upper mold pressure strip 71 and the lower mold pressure strip 81 correspond completely to the spiral joint of the strip 1 to ensure that they can be accurately pressed at the joint. The width of the upper mold pressure strip 71 and the lower mold pressure strip 81 is greater than the width of the first joint 111 and the second joint 112 to ensure that the upper mold pressure strip 71 and the lower mold pressure strip 81 can completely cover the first joint 111 and the second joint 112.

[0047] The mold-closing mechanism is activated, causing the upper mold body 7 and the lower mold body 8 to close together. Then, the heating system is activated, using heating wires 21 built into the upper mold body 7, lower mold body 8, and tube forming cage 2 to heat the spiral joint portion of the strip 1. The heating temperature is set to 200-230℃, and the heating time is 30-60 seconds, causing the first joint 111 and the second joint 112 of the spirally wound strip 1 to melt and fuse together. After heating is complete, the mold-closing pressure remains constant. After naturally cooling to below 80°C, the mold is opened to complete the forming of the pipe 101. The end of the upper mold pressure strip 71 facing the lower mold pressure strip 81 is provided with an insertion groove 72, and the end of the lower mold pressure strip 81 facing the upper mold pressure strip 71 is provided with an insertion block 82 that corresponds to the insertion groove 72. After the upper mold body 7 and the lower mold body 8 are closed, the mold parting lines of the upper mold body 7 and the lower mold body 8, and the mold parting lines of the upper mold pressure strip 71 and the lower mold pressure strip 81 are intersected to prevent the temperature at the mold parting point from not reaching the requirements.

[0048] In this embodiment, the longer the pipe 101 is, the more difficult it is to produce, and the more difficult it is to demold the pipe 101. The length of the produced pipe 101 should not exceed 3 meters. After the pipe 101 is cooled to room temperature, the connection between the pipe forming cage 2 and the winding machine is disassembled, and the first fixing ring 3 is removed. The fixation between the second fixing ring 4 and the strip 1 is loosened, and the pipe 101 can be pulled out from the front end of the pipe forming cage 2 for demolding.

[0049] Example 2:

[0050] This embodiment provides a pipe material manufactured using the production method described in Embodiment 1. Specifically, it includes a pipe 101, with a wire 12 spirally wound around the outer wall of the pipe 101. The wire 12 is integrally formed with the pipe 101, meaning it is part of the strip 1. After winding, it is fused to the sheet 11. The connection points of the pipe 101 can be achieved by peeling off the wire 12 or by connecting it through a pipe joint on the inner wall of the pipe 101. The wire 12 is partially covered with optical fiber 13, with both ends of the optical fiber 13 extending out of the wire 12 by 50-100mm. Both ends of the optical fiber 13 are equipped with a connector 14, which has a waterproof and sealed structure, facilitating rapid connection to the data acquisition terminal during on-site construction. Additionally, according to the pipeline laying length, optical fiber splice boxes can be installed at the pipe segment connection points to ensure continuous transmission of optical fiber signals. This lays the hardware foundation for subsequent access to the unified urban underground pipeline management information system, enabling real-time monitoring and accurate early warning of pipe leakage, deformation, and other faults.

[0051] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing a pre-embedded optical fiber wound structure wall pipe, characterized by, The method comprises the following steps: S1, preparing a tape: covering the raw material with an optical fiber (13) and extruding a tape (1) through an extruder, cooling and winding the tape (1) into a disc; S2, tape preheating: unwinding the disc-shaped tape (1), and fixing the end of the tape (1) to the first fixing ring (3) at the end of the pipe forming cage (2) after passing through the heating sleeve; S3, tape winding: translating the disc-shaped tape (1) along the axial direction of the pipe forming cage (2), and rotating the pipe forming cage (2) synchronously, so that the tape (1) is spirally wound along the axial direction of the pipe forming cage (2), and the other end of the tape (1) is fixed to the second fixing ring (4) at the rear end of the pipe forming cage (2); S4, mold hot melting: the upper mold body (7) above the pipe forming cage (2) and the lower mold body (8) below the pipe forming cage (2) are combined, the upper mold body (7) and the lower mold body (8) and the pipe forming cage (2) heat the spiral joint part of the tape (1), and the spirally wound tape (1) is hot melted and connected to form a pipe (101).

2. The method for producing a wound-structured pipe with pre-embedded optical fibers according to claim 1, characterized in that, The tape (1) comprises a sheet body (11) and a wire body (12), the sheet body (11) and the wire body (12) are integrally formed, the wire body (12) is located on one side of the sheet body (11), the inner side of the sheet body (11) serves as the inner wall of the pipe (101), and the wire body (12) internally covers an optical fiber (13).

3. The method for producing a wound-structured tube with pre-embedded optical fibers according to claim 1, characterized in that, The first fixing ring (3) is installed at the front end of the pipe forming cage (2), the first fixing ring (3) comprises a first spiral surface (31), the first spiral surface (31) is located on the side of the first fixing ring (3) facing the rear end of the pipe forming cage (2), and the slope of the first spiral surface (31) corresponds to the slope of the spiral winding of the tape (1).

4. The method for producing a wound-structured tube with pre-embedded optical fibers according to claim 2, characterized in that, The first fixing ring (3) comprises a first limiting plate (32), a slot is formed between the first limiting plate (32) and the outer wall of the pipe forming cage (2), the part of the sheet body (11) close to the first fixing ring (3) is inserted between the first limiting plate (32) and the outer wall of the pipe forming cage (2), and the first locking rod (321) installed on the first limiting plate (32) fixes the sheet body (11) and the first limiting plate (32).

5. The method for producing a wound-structured tube with pre-embedded optical fibers according to claim 2, characterized in that, The first fixing ring (3) comprises a first blocking surface (34) abutting against the front end of the sheet body (11), and the second fixing ring (4) comprises a second blocking surface (44) abutting against the rear end of the sheet body (11).

6. The method for producing a wound-structured tube with pre-embedded optical fibers according to claim 5, characterized in that, The first fixing ring (3) comprises a first groove (72) (33) communicating with the first blocking surface (34), and the second fixing ring (4) comprises a second groove (72) (43) communicating with the second blocking surface (44).

7. The method for producing a wound-structured pipe with pre-embedded optical fibers according to claim 1, characterized in that, In step S3, the rear end of the strip (1) is fixed behind the second fixing ring (4), the second fixing ring (4) is rotated in the spiral direction of the strip (1) to wind the rear end of the strip (1), the compression ring (5) is moved along the axial direction of the pipe forming cage (2) to approach the second fixing ring (4), the compression ring (5) is abutted against the second fixing ring (4), and the second fixing ring (4) is fixedly connected with the compression ring (5) through bolts.

8. The method of producing a pre-embedded optical fiber wound structure wall pipe according to claim 1, wherein The upper die body (7) comprises an upper die pressing strip (71), and the lower die body (8) comprises a lower die pressing strip (81), the upper die pressing strip (71) and the lower die pressing strip (81) correspond to the spiral joint of the strip (1).

9. The method for producing a spiral-wound structural wall tube with pre-embedded optical fibers according to claim 2, characterized in that, The sheet body (11) comprises a first joint part (111) and a second joint part (112), the first joint part (111) and the second joint part (112) are respectively located on the left side and the right side of the sheet body (11), and the spiral-wound sheet body (11) makes the first joint part (111) and the second joint part (112) at the front and rear positions be connected.

10. A pipe made using the method of claim 1-9, characterized in that, The pipe (101) is provided with a spiral-wound wire body (12) on the outer wall, the wire body (12) is integrally formed with the pipe (101), a part of an optical fiber (13) is wrapped inside the wire body (12), both ends of the optical fiber (13) extend out of the wire body (12), and connectors (14) are mounted on both ends of the optical fiber (13).

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