Manufacturing process and equipment of integrated optical-electric composite cable for structural strain monitoring

Abstract

The present invention belongs to the field of optical fiber sensing technology, and specifically relates to an integrated optoelectronic composite cable manufacturing process and equipment for structural strain monitoring. It includes a traction device, a drawing device, a driving device, a drawing die, a high-pressure air pump, a high-pressure air pipe, a glue injection tank, an optical fiber winding drum, a glue tank, a servo motor, a coupling, and a platform; a driving device is provided on one side of the platform, the driving device is connected to the servo motor, a drawing device is provided on the upper part of the driving device, one end of the metal tube to be drawn is clamped with the traction device, a drawing die is provided on the outer side of the servo motor on the platform, the metal tube to be drawn passes through the drawing die, one end of the metal tube to be drawn is sleeved on the glue injection tank, a high-pressure air pump is installed on the upper part of the glue injection tank, the high-pressure air pump is connected to the glue injection tank through the high-pressure air pipe, an optical fiber winding drum is installed on the glue injection tank, and an optical fiber is wound on the optical fiber winding drum. The advantages are: small structural space required, good detection effect, and high utilization efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber sensing, and in particular relates to a manufacturing process and equipment of an integrated optoelectronic composite cable for structural strain monitoring. Background Art

[0002] In recent years, with rapid economic growth, my country has invested in the construction of a large number of major civil engineering structures. These structures, such as bridges, tunnels, and nuclear facilities, require real-time monitoring of the health of large concrete components. These structures often operate in harsh environments and place high demands on sensors. Fiber optic sensors offer advantages such as small size, corrosion resistance, immunity to electromagnetic interference, and high measurement accuracy. Using fiber optic cables encapsulated with fiber optic sensors for measurement is currently a common measurement method. Furthermore, these projects are designed for long service lives and demanding measurement requirements. Therefore, optical cables must be highly reliable over long periods of use, with no structural damage, no loss of accuracy, high strain transfer rates, and compatibility with existing carrier communication capabilities.

[0003] Existing disclosed patents CN1553234 and CN101655351 respectively encapsulate fiber grating sensors and FP sensors in metal capillaries. However, the above encapsulation method can only be applied to optical fiber packaging in short tubes. Applying this process in long capillaries cannot solve the problem that the optical fiber is difficult to penetrate due to the friction of the metal tube inner wall, and the adhesive is difficult to fill the internal gap due to the liquid resistance along the way. Therefore, the sensor encapsulated by this method cannot perform continuous distributed measurement and cannot meet the needs of large-scale projects. In addition, existing optical cables (such as CN112466547 and CN209895813) all adopt polyethylene and fiber materials to make sheaths. The sheath and optical fiber do not produce a close connection, and the sheath is thick, has many layers, and the polyethylene elastic modulus is low. Moreover, the sheath ... Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated optoelectronic composite cable manufacturing process and equipment for structural strain monitoring. The optical cable produced by this process has the advantages of high strain transfer rate, strong reliability, wide measurement range, and compatibility with existing carrier communication capabilities.

[0005] The technical solution of the present invention is as follows: integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring, including a traction device, a drawing device, a driving device, a drawing die, a high-pressure air pump, a high-pressure air pipe, a glue injection tank, an optical fiber winding disk, a glue box, a servo motor, a coupling and a platform; a driving device is provided on one side of the platform, the driving device is connected to the servo motor, a drawing device is provided on the upper part of the driving device, one end of the metal tube to be drawn is clamped with a traction device, a drawing die is provided on the outside of the servo motor on the platform, the metal tube to be drawn passes through the drawing die, one end of the metal tube to be drawn is sleeved on the glue injection tank, a high-pressure air pump is installed on the upper part of the glue injection tank, the high-pressure air pump is communicated with the glue injection tank through the high-pressure air pipe, an optical fiber winding disk is installed on the glue injection tank, and optical fiber is wound on the optical fiber winding disk.

[0006] A glue box is installed on the glue injection tank, and the glue injection tank can move along the axis direction of the metal pipe on the platform.

[0007] The driving device is a worm transmission mechanism, and a worm is provided on the driving device.

[0008] The worm is connected to the servo motor through a coupling.

[0009] A first centering device is provided between the driving device and the drawing device.

[0010] The drawing die is provided with a second centering device.

[0011] The first and second centering devices are scissor-type structures.

[0012] A locking switch is installed on the pulling device.

[0013] The pulling device includes a clamp and an optical fiber clamping hoop. The clamp clamps one end of the metal tube to be drawn, and the optical fiber clamping hoop is sleeved on the outside of the clamp.

[0014] The drawing die includes a drawing outer die and a drawing core die. A funnel-shaped through hole is opened in the middle of the drawing outer die, and the end with a smaller diameter of the through hole faces the drawing device. The metal tube to be drawn passes through the drawing outer die of the drawing die. The metal tube to be drawn is equipped with a drawing core die. The drawing core die is a conical structure with a through hole in the middle. The metal tube to be drawn is also equipped with an optical fiber, which passes through the through hole in the middle of the drawing core die.

[0015] A sealing ring is provided between the metal tube to be drawn and the glue injection tank.

[0016] An optical fiber guide device is installed on the glue injection tank.

[0017] The process for manufacturing an integrated optical-electric composite cable for structural strain monitoring includes the following steps:

[0018] Step 1: Place the metal tube to be processed with one end closed into the drawing outer die, leaving the closed part exposed at the left end. Then, insert the drawing core die into the tube body, place the closed part into the drawing device, turn on the locking switch to fix the metal tube to be processed, and insert the right end of the metal tube to be processed into the holes of the glue injection tank and the glue box. Use a sealing ring to seal it, and add polyurethane glue to the sealing part for secondary sealing.

[0019] Step 2: Wind the optical fiber onto the optical fiber winding drum. The extended end of the optical fiber enters the glue box through the optical fiber guide device, passes horizontally through the metal tube to be processed, and enters the optical fiber through-hole of the drawing core mold until the optical fiber passes through the closing part of the metal tube to be processed and enters the optical fiber pulling device. Tighten the optical fiber clamp to fix the optical fiber; adjust the first and second centering devices to ensure the centering of the optical fiber and the processed metal tube;

[0020] Step 3: The encapsulating adhesive is a two-component epoxy resin adhesive. The two components of the encapsulating adhesive are thoroughly mixed until no flocs remain. The adhesive is placed in a centrifuge for defoaming treatment and then poured into a glue tank.

[0021] Step 4: Tighten the locking nut of the glue injection tank to prevent the glue injection tank from losing pressure. Use a high-pressure air pump to pressurize the glue injection tank through the high-pressure air pipe. The increased pressure in the glue injection tank will push the liquid glue into the metal tube to be processed. At the same time, the servo motor drives the drawing device to move left. The glue injection tank moves along with the drawing of the metal tube to be processed. After the drawing device reaches the left end of the worm, close the locking switch to release the metal tube to be processed. The servo motor drives the drawing device back to the initial state again, and open the locking switch to lock the metal tube to be processed. Repeat the above operation until the stretched length of the metal tube to be processed meets the requirements.

[0022] Step 5: After the drawing is completed, continue to pressurize the glue injection tank until the encapsulation adhesive can be observed to flow steadily from the left end of the metal tube to be processed. At this time, the encapsulation adhesive completely fills the metal tube to be processed;

[0023] Step 6: Perform surface knurling and surface oxidation treatment on the metal tube to be processed to improve the strain transfer rate between it and the measured substrate.

[0024] In step 3, in order to ensure the continuity of the glue injection process and avoid the generation of bubbles in the metal pipe to be processed, the colloid liquid surface is immersed in the pipe mouth of the metal pipe to be processed.

[0025] In step 5, the optical fiber winding drum is appropriately reversed and fixed to prevent the optical fiber from slipping, and the tensioning pulley is adjusted so that the optical fiber bears a pre-tightening force of 1.5N. The optical fiber is kept taut for 32 hours to complete the curing.

[0026] The beneficial effects of the present invention are as follows: the present invention can well protect sensitive optical fibers by encapsulating distributed optical fiber strain sensors and utilizing the strength characteristics of metal capillaries and encapsulation adhesives; the present invention requires a small structural space and can perform kilometer-level packaging according to engineering needs, with good detection effects and high utilization efficiency; the present invention can perform surface treatments such as knurling and oxidation on the surface of the capillary metal tube, thereby enhancing the bonding force between the optoelectronic composite cable and the measured substrate, enabling cooperative deformation between the optical fiber and the substrate, and greatly improving the strain transfer rate; the present invention provides a carrier communication channel with high physical strength and unaffected by harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring provided by the present invention;

[0028] Figure 2 is a schematic diagram of a traction device of the present invention;

[0029] Figure 3 It is a schematic diagram of the drawing die of the present invention;

[0030] Figure 4 It is a schematic diagram of the centering device of the present invention.

[0031] In the figure: 1 traction device, 2 drawing device, 3 first centering device, 4 second centering device, 5 drawing die, 6 high-pressure air pipe, 7 glue injection tank, 8 optical fiber winding disk, 9 optical fiber guide device, 10 high-pressure air pump, 11 glue tank, 12 sealing ring, 13 servo motor, 14 coupling, 15 locking switch, 16 driving device, 17 platform, 18 worm, 19 metal tube to be processed, 20 optical fiber, 101 clamp, 102 optical fiber clamping hoop, 501 drawing outer die, 502 drawing core die, 31 adjusting knob, 32 adjusting shaft, 33 support plate, 34 lifting plate. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1-3As shown, the integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring includes a traction device 1, a drawing device 2, a first centering device 3, a second centering device 4, a drawing die 5, a high-pressure air pump 10, a high-pressure air pipe 6, a glue injection tank 7, an optical fiber winding disk 8, an optical fiber guide device 9, a glue tank 11, a sealing ring 12, a servo motor 13, a coupling 14, a locking switch 15, a driving device 16 and a platform 17; wherein, a driving device 16 is provided on one side of the platform 17, and the driving device is a worm transmission mechanism, and a worm 18 is provided on the driving device 16, and the worm 18 is connected to the servo motor 13 through the coupling 14, and the drawing device 2 is fixedly installed on the upper part of the driving device 16, and a first centering device 3 is provided between the driving device 16 and the drawing device 2, and a locking switch 15 is installed on the drawing device 2, and the first centering device 3 is a scissors structure (such as Figure 4 As shown), one end of the metal tube 19 to be drawn is clamped with a traction device 1, as shown Figure 2 As shown, the pulling device 1 includes a clamp 101 and a fiber clamp 102. The clamp 101 clamps one end of the metal tube 19 to be drawn. The fiber clamp 102 is sleeved on the outside of the clamp 101. A drawing die 5 is installed on the platform 17 outside the servo motor 13. Figure 3 As shown, the drawing die 5 includes a drawing outer die 501 and a drawing core die 502. A funnel-shaped through hole is opened in the middle of the drawing outer die 501, and the end with a smaller diameter of the through hole faces the drawing device 2. The metal tube 19 to be drawn passes through the drawing outer die 501 of the drawing die 5. The metal tube 19 to be drawn is equipped with a drawing core die 502. The drawing core die 502 is a conical structure with a through hole opened in the middle. The metal tube 19 to be drawn is also equipped with an optical fiber 20. The optical fiber 20 passes through the drawing outer die 501 of the drawing die 5. One end of the metal tube 19 to be drawn is mounted on the glue injection tank 7 through the through hole in the middle of the drawing core mold 502. A sealing ring 12 is provided between the metal tube 19 to be drawn and the glue injection tank 7. A high-pressure air pump 10 is installed on the upper part of the glue injection tank 7. The high-pressure air pump 10 is connected to the glue injection tank 7 through a high-pressure air pipe 6. The glue injection tank 7 is also equipped with an optical fiber winding disk 8 and an optical fiber guide device 9. The optical fiber 20 is wound on the optical fiber winding disk 8. The glue injection tank 7 is also equipped with a glue box 11.

[0034] like Figure 4 As shown, the first centering device 3 and the second centering device 4 have the same structure, including an adjusting knob 31, an adjusting shaft 32, a support plate 33 and a lifting plate 34. The upper part of the lifting plate 34 is connected to the support plate 33, and the lower end of the lifting plate 34 is connected to the adjusting knob 31 through the adjusting shaft 32. The rotation of the adjusting knob 31 drives the rotation of the adjusting shaft 32, thereby driving the lifting plate 34 to move up and down.

[0035] The glue injection tank 7 can be moved on the platform along the axis direction of the metal tube to be processed. The drawing device 2 uses the locking device 15 switch to control the clamping and loosening of the metal tube to be processed 19. During the drawing process, the locking switch is turned on to lock the metal tube to be processed 19. After the drawing is completed, the locking switch is turned off to loosen the metal tube to be processed 19, and the drawing device 2 returns to the initial position. The driving device is a worm transmission mechanism, the left end of the worm is fixed on the platform, and the other end is connected to the servo motor 13 through the coupling 14. The center of the drawing core mold 5 is processed with a fiber optic through hole with a diameter of 0.5 mm, so that the optical fiber can pass through the drawing core mold into the metal tube to be processed 19. The first centering device 3 and the second centering device 4 use a scissor structure (such as Figure 4 Two centering devices are arranged below the drawing device and the drawing die, respectively, to adjust the height of the drawing device and the drawing die so that the optical fiber can maintain alignment with the metal tube 19 to be processed. The high-pressure air pump is fixed to the upper part of the glue injection tank and can move with the glue injection tank during the drawing process.

[0036] The process for manufacturing an integrated optical-electric composite cable for structural strain monitoring includes the following steps:

[0037] Step 1: Place the metal tube to be processed with one end closed into the drawing outer mold, with the closed part exposed at the left end. Then embed the drawing core mold into the tube body, place the closed part into the drawing device, turn on the locking switch to fix the metal tube to be processed, and embed the right end of the metal tube to be processed into the holes of the glue injection tank and the glue box. Use a sealing ring to seal it, and add polyurethane glue to the sealing part for secondary sealing.

[0038] Step 2: Wind the optical fiber onto the fiber winding drum. The extended end of the fiber passes through the fiber guide device and into the glue tank. It then passes horizontally through the metal tube to be processed and into the fiber through-hole of the drawing mandrel. The fiber emerges from the closed end of the metal tube to be processed and enters the fiber pulling device. Tighten the fiber clamp to secure the fiber. Adjust the first and second centering devices to ensure the optical fiber is aligned with the metal tube.

[0039] Step 3: The encapsulation adhesive uses a two-component epoxy resin glue. The two components of the encapsulation adhesive are thoroughly mixed until no flocs remain. The mixture is placed in a centrifuge for defoaming treatment and then poured into a glue tank. In order to ensure the continuity of the glue injection process and avoid the generation of flocs inside the metal tube to be processed, the colloid liquid surface should be immersed in the tube mouth of the metal tube to be processed.

[0040] Step 4: Tighten the locking nut of the glue injection tank to prevent the glue injection tank from losing pressure. Use a high-pressure air pump to pressurize the glue injection tank through the high-pressure air pipe. The increased pressure in the glue injection tank will push the liquid glue into the metal tube to be processed. At the same time, the servo motor drives the drawing device to the left. As the metal tube to be processed is pulled to the left, the glue injection tank moves accordingly. After the drawing device reaches the left end of the worm, close the locking switch to release the metal tube to be processed. The servo motor drives the drawing device back to the initial state again. Open the locking switch to lock the metal tube to be processed. Repeat the above steps until the stretched length of the metal tube to be processed meets the requirements. Throughout the entire process, pay real-time attention to the centering of the optical fiber and the metal tube to be processed and adjust the centering device.

[0041] Step 5: After drawing, continue pressurizing the injection tank until you can observe the encapsulation adhesive steadily flowing out from the left end of the metal tube to be processed. At this point, the encapsulation adhesive completely fills the capillary metal tube. Appropriately invert the fiber winding drum and secure it to prevent the fiber from slipping. Adjust the tensioner to ensure that the fiber is subjected to a preload of 1.5N. Keep the fiber taut for 32 hours to complete the curing (the encapsulation adhesive curing time can be shortened by increasing the temperature and ventilating the air).

[0042] Step 6: The metal tube can be knurled and oxidized to improve the strain transfer rate between it and the substrate being measured. Surface knurling allows the metal tube to be effectively embedded in the substrate being measured, while surface oxidation increases friction with the substrate being measured.

[0043] Example

[0044] First, prepare a metal tube with one end closed, clean it with anhydrous ethanol to remove residual iron filings and dust, and place the metal tube to be processed into the drawing outer mold 501, with the closed part exposed at the left end. Insert the drawing core mold 502 into the tube body, and place the closed part into the drawing device 2. Open the locking switch 15 to fix the metal tube to be processed. Make the right end of the metal tube to be processed be embedded in the hole of the glue injection tank 7 and the glue box 11, use the sealing ring 12 to seal it, and add polyurethane glue to the seal for secondary sealing. Wind the optical fiber on the optical fiber winding disk 8, and the protruding end of the optical fiber enters the glue box 11 through the optical fiber guiding device 9, horizontally passes through the metal tube to be processed, and enters the optical fiber through-hole of the drawing core mold 502, until the optical fiber passes through the closed part of the metal tube to be processed and enters the optical fiber pulling device 1, and tightens the optical fiber clamping hoop 102 to fix the optical fiber. Adjust the height of the first centering device 3 and the second centering device 4 to keep the optical fiber aligned with the metal tube to be processed. Thoroughly mix the two components of the encapsulating adhesive and observe that there is no flocculent residue. Place the adhesive in a centrifuge for defoaming treatment. Observe that the colloid is clear and transparent, and then pour it into the glue tank 11 until the colloid liquid level submerges the mouth of the metal tube to be processed. Tighten the locking nut of the glue injection tank 7 and use the high-pressure air pump 10 to pressurize the glue injection tank 7 through the high-pressure air pipe 6. The pressure in the glue injection tank 7 increases, pushing the liquid glue into the metal tube to be processed. At the same time, the servo motor 13 drives the drawing device 2 to move left. During the process of drawing the metal tube to the left, the glue injection tank 7 moves accordingly. After the drawing device 2 reaches the left end of the worm, close the locking switch 15 to release the metal tube to be processed. The servo motor 13 drives the drawing device 2 back to the initial state again, and open the locking switch 15 to lock the metal tube to be processed. Repeat the above operation until the stretched length of the metal tube to be processed meets the requirements. After the drawing is completed, continue to pressurize the glue injection tank 7 and observe that the encapsulating adhesive flows steadily from the left end of the metal tube to be processed. At this time, the encapsulating adhesive completely fills the metal tube to be processed. Secure the fiber winding reel 8 and adjust the tensioner to a preload of 1.5 N. Maintain tension for 32 hours until the fiber is cured. Knurl and oxidize the metal tube to achieve this. This completes the fabrication of an integrated optoelectronic composite cable for structural strain monitoring.

Claims

1. Integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring, characterized by: The utility model comprises a traction device, a drawing device, a driving device, a drawing die, an air pump, an air pipe, a glue injection tank, an optical fiber winding disk, a glue tank, a servo motor, a coupling and a platform; a driving device is provided on one side of the platform, the driving device is connected to the servo motor, a drawing device is provided on the upper part of the driving device, one end of the metal tube to be drawn is clamped with the traction device, a drawing die is provided on the outer side of the servo motor, the metal tube to be drawn passes through the drawing die, one end of the metal tube to be drawn is sleeved on the glue injection tank, and the upper part of the glue injection tank is provided with a An air pump is installed, which is connected to the glue injection tank through an air pipe. An optical fiber winding disk is installed on the glue injection tank, and an optical fiber is wound on the optical fiber winding disk; the drawing mold includes a drawing outer mold and a drawing core mold, and a funnel-shaped through hole is opened in the middle of the drawing outer mold, and the end with a smaller diameter of the through hole faces the drawing device. The metal tube to be drawn passes through the drawing outer mold of the drawing mold, and the drawing core mold is installed in the metal tube to be drawn. The drawing core mold is a conical structure with a through hole in the middle. The metal tube to be drawn is also installed with an optical fiber, and the optical fiber passes through the through hole in the middle of the drawing core mold.

2. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: A glue box is installed on the glue injection tank, and the glue injection tank can move along the axis direction of the metal pipe on the platform.

3. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: The driving device is a worm transmission mechanism, and a worm is provided on the driving device.

4. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 3, characterized in that: The worm is connected to the servo motor through a coupling.

5. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: A first centering device is provided between the driving device and the drawing device.

6. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: The drawing die is provided with a second centering device.

7. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to any one of claims 5 and 6, characterized in that: The first and second centering devices are scissor-type structures.

8. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: A locking switch is installed on the pulling device.

9. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: The pulling device includes a clamp and an optical fiber clamping hoop. The clamp clamps one end of the metal tube to be drawn, and the optical fiber clamping hoop is sleeved on the outside of the clamp.

10. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: A sealing ring is provided between the metal tube to be drawn and the glue injection tank.

11. The integrated optoelectronic composite cable manufacturing equipment for structural strain monitoring according to claim 1, characterized in that: An optical fiber guide device is installed on the glue injection tank.

12. A process for manufacturing an integrated optoelectronic composite cable for structural strain monitoring, characterized in that: The steps include: Step 1: Place the metal tube to be processed with one end closed into the drawing outer die, leaving the closed part exposed at the left end. Then, insert the drawing core die into the tube body, place the closed part into the drawing device, turn on the locking switch to fix the metal tube to be processed, and insert the right end of the metal tube to be processed into the holes of the glue injection tank and the glue box. Use a sealing ring to seal it, and add polyurethane glue to the sealing part for secondary sealing. Step 2: Wind the optical fiber onto the optical fiber winding drum. The extended end of the optical fiber enters the glue box through the optical fiber guide device, passes horizontally through the metal tube to be processed, and enters the optical fiber through-hole of the drawing core mold until the optical fiber passes through the closing part of the metal tube to be processed and enters the optical fiber pulling device. Tighten the optical fiber clamp to fix the optical fiber; adjust the first and second centering devices to ensure the centering of the optical fiber and the processed metal tube; Step 3: Use two-component epoxy resin glue as the encapsulation adhesive. Mix the two components of the encapsulation adhesive thoroughly until there is no flocculent residue. Place it in a centrifuge for defoaming treatment and then pour it into the glue tank. Step 4: Tighten the locking nut of the glue injection tank to prevent the glue injection tank from losing pressure. Use an air pump to pressurize the glue injection tank through the air pipe. The increased pressure in the glue injection tank will push the liquid glue into the metal tube to be processed. At the same time, the servo motor drives the drawing device to move left. The glue injection tank moves along with the drawing of the metal tube to be processed. After the drawing device reaches the left end of the worm, close the locking switch to release the metal tube to be processed. The servo motor drives the drawing device back to the initial state again. Open the locking switch to lock the metal tube to be processed. Repeat the above operation until the stretched length of the metal tube to be processed meets the requirements. Step 5: After the drawing is completed, continue to pressurize the glue injection tank until the encapsulation adhesive can be observed to flow steadily from the left end of the metal tube to be processed. At this time, the encapsulation adhesive completely fills the metal tube to be processed; Step 6: Perform surface knurling and surface oxidation treatment on the metal tube to be processed to improve the strain transfer rate between it and the measured substrate.

13. The process for manufacturing an integrated optoelectronic composite cable for structural strain monitoring according to claim 12, characterized in that: In step 3, in order to ensure the continuity of the glue injection process and avoid the generation of bubbles in the metal pipe to be processed, the colloid liquid surface is immersed in the pipe mouth of the metal pipe to be processed.

14. The process for manufacturing an integrated optoelectronic composite cable for structural strain monitoring according to claim 12, wherein: In step 5, the optical fiber winding drum is appropriately reversed and fixed to prevent the optical fiber from slipping, and the tensioning pulley is adjusted so that the optical fiber bears a pre-tightening force of 1.5N. The optical fiber is kept taut for 32 hours to complete the curing.

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