OPGW optical cable optical unit laser welding anti-oxidation device and method

Abstract

The application relates to the technical field of oxidation prevention of laser welding of optical cable optical units, in particular to an OPGW optical cable optical unit laser welding oxidation prevention device and method, which comprises a bottom rack, a moving block is arranged on the bottom rack and slides along the length direction of the bottom rack, a protective cylinder is arranged on the top of the moving block, a double-acting cylinder is arranged on the bottom rack and located between the two protective cylinders, and the telescopic ends of the double-acting cylinder are connected with the corresponding moving blocks. Inert gas is pumped into the cavity of the front protective cylinder before welding, so that the internal oxygen, water vapor and other impurities can be effectively discharged, the oxidation problem and the pore defect during welding are eliminated from the source, meanwhile, when the protective cylinders are separated, the annular frame keeps synchronous displacement, laser shielding is avoided, the gap is reduced to prevent external air from entering, a clean and stable environment is provided for laser welding, the welding precision is further ensured through the optical cable limiting and fixing design, and the mechanical strength and electrical performance of the welding point are improved.

Description

Technical Field

[0001] This application relates to the technical field of anti-oxidation in laser welding of optical fiber units for optical cables, and in particular to an anti-oxidation device and method for laser welding of OPGW optical fiber units. Background Technology

[0002] Optical fiber cables play a crucial role in modern communication networks, transmitting vast amounts of information. An optical fiber cable is composed of many tiny optical fibers, which themselves consist of a core and an outer cladding. To enhance the strength and transmission performance of the fiber, it is typically encased in one or more protective materials, forming an optical unit.

[0003] However, in order to ensure the stable performance of the optical unit and avoid light loss and interference during transmission, the optical unit needs to be connected by welding. For example, patent application CN208929484U discloses a laser welding anti-oxidation protection device. The device includes a base and an upper seat on one side, each with a first and a second circular hole for laser to enter. The upper seat is provided with a cavity (connected to the first circular hole) and a first inert gas inlet. In use, the base is placed on the surface of the workpiece to be welded, and the laser welds through the double circular holes. Air can easily enter the weld from the gap between the laser and the first circular hole. After the inert gas is introduced, the gas fills the cavity and overflows from the gap, forming an outward airflow to isolate the air.

[0004] While existing technologies can provide protection for the weld and isolate it from external air interference by introducing inert gas into the cavity and filling it with gas, there are still significant shortcomings in practical applications. On the one hand, after the welding operation is completed, the weld is still in a sensitive state where it is easily oxidized due to its high temperature. To prevent it from oxidizing when it comes into contact with air in the early stage of cooling, it is necessary to continuously introduce inert gas for protection, and the gas supply cannot be interrupted immediately when the welding stops.

[0005] On the other hand, the aforementioned existing technology can only provide protection for the weld during the welding process and for a short period of time immediately after the welding is completed. When the optical unit is removed from the device after welding, it loses the continuous protection of the inert gas. The weld exposed to the air, especially the part that has not been completely cooled, still faces the risk of being oxidized by oxygen in the air, which may lead to a decline in weld quality. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides an anti-oxidation device and method for laser welding of OPGW optical cable optical units, employing the following technical solution: In one aspect, there is an anti-oxidation device for laser welding of OPGW optical cable optical units, including a bottom frame.

[0007] A movable block is slidably mounted on the bottom frame along its length. A protective cylinder is installed on the top of the movable block. A two-way cylinder is installed on the bottom frame between the two protective cylinders. The extension and retraction ends of the two-way cylinder are respectively connected to the corresponding movable blocks.

[0008] The protective cylinder has an internal cavity, with an air inlet at the top that communicates with the cavity, and a through slot on the side for the optical cable to pass through.

[0009] A welding mechanism is also installed on the bottom frame. The welding mechanism includes a ring frame, an electric slider, and a laser welding machine. The ring frame is installed on the bottom frame via a support frame and is coaxial with the protective cylinder. The electric slider is slidably set on the ring frame and the laser welding machine is installed via a vertical rod.

[0010] The cavity is equipped with a protective mechanism, which includes an annular frame that is slidably disposed in the cavity and two electric sliders that are slidably disposed on the annular frame. An insulating strip is disposed on the electric sliders via a rotating shaft, and multiple insulating strips are disposed on the insulating strip along its length.

[0011] Preferably, the annular frame is slidably connected to the protective cylinder via a movable frame. One end of the movable frame is connected to the annular frame, and the other end is provided with a rack plate. A fixed frame is installed on the movable block, and a gear 1 that meshes with the rack plate is installed between the fixed frames via a driven shaft. The bottom of the gear 1 meshes with a rack plate 2 that is fixed on the bottom frame.

[0012] Preferably, the cavity is provided with a limiting component for fixing the optical cable. The limiting component includes a cable conduit installed on the inner wall of the cavity and a dual-axis cylinder. The telescopic end of the dual-axis cylinder is connected to a lifting plate. The lifting plate is equipped with a limiting plate for clamping the optical cable through a connecting block.

[0013] Preferably, the limiting plate is provided with a rack plate three, and a fixed frame is installed on the cavity side wall. A gear two that meshes with the rack plate three is installed on the fixed frame through a driven shaft. The cavity side wall is also provided with a sliding frame. A rack plate four that meshes with the gear two is slidably arranged on the sliding frame. A hot pressing block is installed at the end of the rack plate four near the optical cable.

[0014] Preferably, the hot press block is provided with a resistance wire for generating heat.

[0015] Preferably, the rotating shafts on the two electric sliders are used for unwinding and rewinding the insulating tape, respectively, and the rotating shafts are driven to rotate by a drive motor.

[0016] Preferably, the insulating tape has adhesive on the side closest to the optical cable.

[0017] Preferably, the axis of the ring frame coincides with the axis of the protective cylinder.

[0018] Preferably, the through slot is a coaxial through hole, used to allow the optical cable to pass through the protective cylinder, and the protective cylinder can be brought into contact with each other or separated under the drive of a bidirectional cylinder.

[0019] Secondly, an anti-oxidation method for laser welding of OPGW optical cable optical units includes the following steps: S1: Optical cable feeding and separation from protective cylinder: The optical cable is fed into the cavity through the through groove, and the telescopic end of the bidirectional cylinder drives the moving block to separate, so that the protective cylinder is separated to make way for the laser.

[0020] S2: Inert gas injection and welding: Inert gas is pumped in through the air inlet, and the electric slider drives the laser welding machine to rotate circumferentially. The laser passes through the gap and irradiates the optical cable connection for welding.

[0021] S3: Optical cable fixing and sealing: The telescopic end of the dual-axis cylinder pushes the limiting plate to squeeze and fix the optical cable. When the protective cylinder separates, the ring frame moves synchronously to avoid blocking the laser.

[0022] S4: Insulation tape application and hot pressing: The electric slider drives the rotating shaft to wind the insulating tape, and the hot pressing block heats and presses the insulation tape to ensure a seal and prevent oxidation.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The device pumps inert gas into the cavity of the protective cylinder before welding, which can effectively remove impurities such as oxygen and water vapor inside, eliminating oxidation and porosity defects during welding from the root. At the same time, when the protective cylinder separates, the annular frame maintains synchronous displacement, which not only avoids blocking the laser, but also reduces the gap to prevent external air from entering, providing a clean and stable environment for laser welding. Combined with the optical cable limiting and fixing design, it further ensures welding accuracy and improves the mechanical strength and electrical performance of the weld point.

[0024] 2. After welding, the two protective cylinders are re-attached to form a sealed space, continuously providing initial anti-oxidation protection for the weld. Subsequently, insulating tape is wrapped around and applied to create an isolation layer, which isolates the weld from external temperature and humidity changes, dust, and corrosive substances. A hot-pressing process further ensures the isolation layer adheres tightly to the outer wall of the optical cable, preventing it from peeling off and creating a secondary seal. This combination of inert gas before welding and double sealing after welding significantly extends the service life of the weld, ensuring the long-term reliability of optical cable communication transmission.

[0025] 3. The device's bidirectional cylinder can flexibly drive the protective cylinder to separate and fit together, adapting to the needs of optical cable feeding and laser clearance. The electric slider drives the laser welding machine to rotate around, enabling omnidirectional welding. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0027] Figure 2 This is the present invention. Figure 1 A magnified view of part A.

[0028] Figure 3 This is the front view of the present invention.

[0029] Figure 4 This is a schematic diagram of the internal structure of the protective cylinder of the present invention.

[0030] Figure 5 This is a schematic diagram of the installation structure between the movable frame, the rack plate, and the annular frame of the present invention.

[0031] Figure 6 This is a schematic diagram of the installation structure between the movable frame, rack plate one, and rack plate two of the present invention.

[0032] Figure 7 This is a schematic diagram of the installation structure between the annular frame and the insulating strip of the present invention.

[0033] Figure 8 This is the present invention. Figure 7 A magnified view of section B.

[0034] Figure 9 This is the present invention. Figure 7 Side view (viewed along the length of the bottom frame).

[0035] Figure 10 This is a schematic diagram of the insulating tape structure of the present invention.

[0036] Figure 11 This is a schematic diagram of the installation structure between the conduit, the dual-axis cylinder, and the limiting plate of the present invention.

[0037] Figure 12 This is a schematic diagram of the installation structure between the limiting plate, the rack plate, and the driven coupling of the present invention.

[0038] Figure 13 This is a schematic diagram of the installation structure between the limiting plate, rack plate three, rack plate four, and hot pressing block of the present invention.

[0039] Explanation of reference numerals in the attached drawings: 1. Bottom frame; 2. Moving block; 3. Protective cylinder; 31. Cavity; 32. Air inlet; 33. Through slot; 34. Moving frame; 35. Rack plate one; 36. Fixed frame; 37. Driven shaft; 38. Gear one; 39. Rack plate two; 4. Two-way cylinder; 5. Welding mechanism; 51. Ring frame; 52. Electric slider; 53. Laser welding machine; 54. Ring frame; 55. Electric slider; 56. Rotating shaft; 57. Insulating tape; 571. Insulation tape; 6. Protective mechanism; 7. Cable conduit; 71. Dual-axis cylinder; 72. Lifting plate; 73. Limiting plate; 74. Rack plate three; 75. Fixed connecting frame; 76. Driven connecting shaft; 77. Gear two; 78. Sliding frame; 79. Limiting plate; 70. Hot pressing block. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1 to 13 This application will be described in further detail.

[0041] This application discloses an anti-oxidation device and method for laser welding of OPGW optical cable optical units, which can completely isolate the weld from the air and then cover and protect the weld. The two work together to ensure that the weld will not oxidize.

[0042] Reference Figure 1 as well as Figure 2 An anti-oxidation device for laser welding of OPGW optical fiber unit includes a bottom frame 1, a movable block 2 slidably disposed on the bottom frame 1 along its length direction, a protective cylinder 3 installed on the top of the movable block 2, a bidirectional cylinder 4 installed on the bottom frame 1 between the two protective cylinders 3 via a cylinder seat, the telescopic ends of the bidirectional cylinder 4 being respectively installed on the movable block 2 on the corresponding side, and a welding mechanism 5 also being installed on the bottom frame 1.

[0043] The protective cylinder 3 has a cavity 31 inside, and a protective mechanism 6 is installed inside the cavity 31. The top of the protective cylinder 3 has an air inlet 32 ​​that is connected to the cavity 31 for passing inert gas. The protective cylinder 3 has through slots 33 on its sides for passing optical cables and coaxially.

[0044] The welding mechanism 5 includes an annular frame 51 coaxial with the protective cylinder 3, and the annular frame 51 is mounted on the bottom frame 1 by a support frame symmetrically arranged along the width direction of the bottom frame 1. An electric slider 52 is slidably arranged inside the annular frame 51, and a laser welding machine 53 is mounted on the electric slider 52 by a vertical rod.

[0045] The protective mechanism 6 includes an annular frame 54 disposed inside the cavity 31 and located between the two protective cylinders 3. The annular frame 54 is slidably disposed inside the cavity 31 of any protective cylinder 3. Two electric sliders 55 are slidably disposed inside the annular frame 54. Each of the electric sliders 55 has a rotating shaft 56 on its opposite side. The rotating shafts 56 are rotatably mounted on the electric sliders 55 through a support protrusion. An insulating strip 57 is disposed between the rotating shafts 56.

[0046] Multiple insulating strips 571 are evenly arranged along the length of the insulating tape 57, and adhesive is provided on the side of the insulating strip 571 closest to the optical cable. Two support protrusions are provided on the electric slider 55 and are symmetrically arranged along the length of the bottom frame 1. The rotating shaft 56 is mounted on the corresponding support protrusion of the electric slider 55 through bearings and is driven to rotate by an existing drive motor (not shown in the figure). The upper rotating shaft 56 is wound with insulating tape 57, and the lower rotating shaft 56 is used to wind up the insulating tape 57 after the insulating strips 571 are pasted.

[0047] In actual operation, at the initial position, the two protective cylinders 3 are tightly pressed together. When it is necessary to weld the optical cable, the optical cable is fed into the cavity 31 through the through groove 33. During the movement, the two optical cables align with the contact surfaces of the two protective cylinders 3 inside the cavity 31. At this time, the bidirectional cylinder 4 is activated. During the movement of the extension end of the bidirectional cylinder 4, the moving block 2 is moved apart. During the movement of the moving block 2, the protective cylinders 3 are separated. Thus, the gap between the protective cylinders 3 makes way for the laser emitted by the laser welding machine 53 during laser welding.

[0048] At this time, inert gas is pumped into the cavity 31 through the air inlet 32. The inert gas expands inside the cavity 31 and causes the air inside the cavity 31 to escape through the gap between the protective cylinders 3, thereby preventing the original gas inside the cavity 31 from affecting the welding oxidation.

[0049] It should be noted that a movable frame 34 is slidably installed through the bottom of the circumference of any protective cylinder 3. One end of the movable frame 34 located inside the corresponding cavity 31 is connected to the annular frame 54. A rack plate 35 is installed at the end of the movable frame 34 located outside the cavity 31. A fixed frame 36 is symmetrically installed on the movable block 2 on the corresponding side along its width direction. A driven shaft 37 is installed between the two fixed frames 36 through a bearing. A gear 38 that meshes with the rack plate 35 is installed on the driven shaft 37. A rack plate 39 that meshes with the gear 38 is provided at the bottom of the gear 38. The rack plate 39 is installed on the bottom frame 1 through a fixed connecting rod.

[0050] In actual operation, the protective cylinder 3 moves synchronously, driving the annular frame 54 to move synchronously. At this time, the annular frame 54 moves synchronously through the moving frame 34, driving the rack plate 35 to move synchronously. During the movement of the rack plate 35, the driven shaft 37 meshes with the gear 38 and, driven by the rack plate 39, drives the moving frame 34 to move synchronously relative to the protective cylinder 3. That is, the annular frame 54 corresponds to the protective cylinder 3.

[0051] During the synchronous movement of the protective cylinder 3, the annular frame 54 can maintain synchronous displacement relative to the protective cylinder 3. This design ensures that even if the protective cylinder 3 undergoes only a small displacement, the problem of the annular frame 54 blocking the laser due to the small gap between the two can still be effectively avoided. At the same time, the reduced gap between the protective cylinders 3 prevents the possibility of external air entering the cavity 31, thereby providing a clean and stable internal environment for laser operation and avoiding interference from impurities on laser energy or operation accuracy.

[0052] Before laser welding, the optical cable needs to be fixed to ensure its stability during the welding process. Specifically, a cable routing tube 7 coaxial with the through groove 33 is installed on the inner wall of the cavity 31. A dual-axis cylinder 71 that cooperates with the cable routing tube 7 is also installed on the inner wall of the cavity 31 through a cylinder seat. A lifting plate 72 is installed on the telescopic end of the dual-axis cylinder 71. A limiting plate 73 for fixing the optical cable is installed on the end of the lifting plate 72 away from the dual-axis cylinder 71 through a connecting block.

[0053] In the actual operation, before welding, the dual-axis cylinder 71 is started. During the movement of the telescopic end of the dual-axis cylinder 71, the lifting plate 72 and the connecting block work together to drive the limiting plate 73 to move synchronously to one side of the optical cable. When the limiting plate 73 corresponding to the same dual-axis cylinder 71 moves to the vicinity of the optical cable, the two limiting plates 73 squeeze and limit the optical cable to ensure that the optical cable will not shake during welding.

[0054] Once the cable is fixed in place, the electric slider 52 is activated. During its movement, the electric slider 52 drives the laser welding machine 53 to rotate around the protective cylinder 3 via the vertical rod. As the laser welding machine 53 rotates, the laser can pass through the gap between the two protective cylinders 3 to irradiate the cable connection and perform welding on the cable connection. During the welding process, the inert gas inside the cavity 31 can isolate the air at the welding point, preventing oxidation from occurring at the welding point.

[0055] After the optical cable welding is completed, the bidirectional cylinder 4 is activated. During the movement of the extension end of the bidirectional cylinder 4, the two protective cylinders 3 are brought back into contact through the moving block 2. At this time, it is not necessary to continue pumping inert gas into the cavity 31. The closed cavity 31 forms a relatively sealed space and always provides anti-oxidation treatment to the weld.

[0056] It should be noted that, at the initial position, the line connecting the two electric sliders 55 is at a 180-degree angle and located on one side of the optical cable connection. That is, the line connecting the two electric sliders 55 will not collide with the optical cable or overlap with the welding point. When either electric slider 55 is started, the electric slider 55 will move and drive the insulating tape 57 to come into contact with the cable welding point. When the electric slider 55 stops moving, the insulating tape 571 on the insulating tape 57 is adhered to the cable welding point by adhesive. When both electric sliders 55 are started, the rotating shaft 56 with the insulating tape 57 wrapped around it will unwind the tape under the drive of the drive motor. After the insulating tape 571 is applied, the rotating shaft 56 will rewind the tape under the drive of the drive motor. During the movement of the two electric sliders 55, the insulating tape 57 will wrap around the welding point to ensure that the insulating tape 571 is always adhered to the welding point during the adhesion process.

[0057] Once a single insulating sticker 571 is pasted, the isolation protection at the welded area on the surface is complete, and the electric slider 55 stops moving and returns to its starting position.

[0058] Since the isolation patch 571 still has the risk of falling off after being adhered near the welding point, the hot pressing block 70 provided by the present invention can perform hot pressing treatment on the adhered isolation patch 571. Specifically, a rack plate three 74 is installed on the limiting plate 73, a fixed frame 75 is installed on the side wall of the cavity 31, a driven shaft 76 is rotatably installed on the fixed frame 75 through a bearing, a gear two 77 that meshes with the rack plate three 74 is installed on the driven shaft 76, and a sliding frame 78 is also installed on the side wall of the cavity 31. A rack plate four 79 that meshes with the gear two 77 is slidably and upper limited on the sliding frame 78, and a hot pressing block 70 is provided at the end of the rack plate four 79 near the optical cable.

[0059] The hot pressing block 70 is equipped with a resistance wire inside. The resistance wire releases heat when energized. The sliding frame 78 is provided with a clearance groove for the rack plate 74 to make way. In specific operation, after the insulating tape 571 is attached, the dual-axis cylinder 71 is activated. The extension end of the dual-axis cylinder 71 drives the limit plate 73 to move apart through the lifting plate 72. At this time, the rack plate 74 moves synchronously during the movement of the rack plate 74. During the movement of the rack plate 74, the driven shaft 76 meshes with the gear 77 to drive the rack plate 79 to move synchronously towards the optical cable side. At this time, the movement of the rack plate 79 drives the hot pressing block 70 to move synchronously. When the hot pressing block 70 moves synchronously to the optical cable and a closed rectangular structure is formed between the hot pressing blocks 70, the hot pressing block 70 stops moving.

[0060] Furthermore, the heat sealing process allows the bonding edges of the insulating tape 571 to undergo heat fusion bonding, forming a sealed structure that is tightly fitted to the outer wall of the optical cable. This prevents the insulating tape 571 from curling up, falling off, or shifting at the optical cable welding point, ensuring the stability of the insulating tape 571's wrapping around the welding point.

[0061] Therefore, before the optical cable welding operation is officially started, the work area environment is first filled with inert gas. By utilizing the chemically stable properties of inert gas and its non-reaction with metals, impurities such as oxygen and water vapor in the welding environment are effectively removed, eliminating defects such as oxidation and porosity that may occur during the welding process from the source.

[0062] After the welding process is completed, the weld is immediately treated with isolation tape 571 to prevent oxidation, further isolating the weld from external temperature and humidity changes, dust and corrosive substances.

[0063] By combining the inert gas environment before welding with the weld seam sealing protection after welding, the interference of environmental factors on the welding quality of optical cables can be minimized, the mechanical strength, electrical performance and long-term stability of the optical cable welding points can be significantly improved, and the transmission reliability of the optical cable communication link can be ensured.

[0064] Finally, see Figure 8 The present invention also provides a method for preventing oxidation during laser welding of OPGW optical fiber unit, the method of use includes the following steps: S1: At the beginning, the two protective cylinders 3 are tightly attached, the optical cable is sent into the cavity 31 through the through groove 33 and aligned, the bidirectional cylinder 4 is started, and the moving block 2 is driven to separate the protective cylinders 3, leaving a gap for the laser to make way, and inert gas is pumped into the cavity 31 through the air inlet 32 ​​to discharge the internal air to prevent oxidation. At the same time, when the protective cylinder 3 moves, the annular frame 54 maintains synchronous displacement to avoid blocking the laser and reduce the gap to prevent external air from entering. The dual-axis cylinder 71 drives the limiting plate 73 to squeeze and fix the optical cable.

[0065] S2: After the optical cable is fixed, the electric slider 52 on the ring frame 51 is activated, which drives the laser welding machine 53 to rotate circumferentially around the protective cylinder 3 via the vertical rod. The laser passes through the gaps between the protective cylinders 3 and irradiates the optical cable connection point for welding.

[0066] S3: After welding, the bidirectional cylinder 4 drives the protective cylinder 3 to re-attach, and the cavity 31 forms a sealed space to continuously prevent oxidation. The electric slider 55 is activated, causing it to move the insulating tape 57 to the weld. The insulating tape 571 on the insulating tape 57 is adhered to the weld by adhesive. Then, the drive motor drives the rotating shaft 56 to release the tape from above and retract it from below. The electric slider 55 moves to make the insulating tape 57 wrap around the weld, completing the seal.

[0067] S4: After the insulating tape 571 is applied, the dual-axis cylinder 71 drives the limiting plate 73 to separate. The rack plate 3 74 is driven by the gear 2 77, causing the rack plate 4 79 to drive the hot pressing block 70 to move towards the optical cable. After the hot pressing block 70 forms a sealed rectangular structure, the internal resistance wire is energized and releases heat to perform hot pressing treatment on the insulating tape 571, so that the edges are heat-fused and bonded tightly to the outer wall of the optical cable.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0069] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An anti-oxidation device for laser welding of OPGW optical cable optical units, comprising a bottom frame, characterized in that: A movable block is slidably installed on the bottom frame along its length. A protective cylinder is installed on the top of the movable block. A two-way cylinder is installed on the bottom frame between the two protective cylinders. The extension and retraction ends of the two-way cylinder are respectively connected to the corresponding movable blocks. The protective cylinder has a cavity inside, with an air inlet at the top that communicates with the cavity, and a through slot on the side for the optical cable to pass through. The cavity is equipped with a limiting component for fixing the optical cable. The limiting component includes a cable conduit installed on the inner wall of the cavity and a dual-axis cylinder. The telescopic end of the dual-axis cylinder is connected to a lifting plate. The lifting plate is equipped with a limiting plate for clamping the optical cable through a connecting block. The limiting plate is provided with a rack plate three, and a fixed connecting frame is installed on the side wall of the cavity. A gear two that meshes with the rack plate three is installed on the fixed connecting frame through a driven connecting shaft. The cavity sidewall is also provided with a sliding frame, on which a rack plate four that meshes with gear two is slidably mounted, and a hot pressing block is installed at the end of rack plate four near the optical cable; A welding mechanism is also installed on the bottom frame. The welding mechanism includes a ring frame, an electric slider and a laser welding machine. The ring frame is installed on the bottom frame by a support frame and is coaxial with the protective cylinder. The electric slider is slidably set on the ring frame and the laser welding machine is installed by a vertical rod. The cavity is equipped with a protective mechanism, which includes an annular frame that is slidably disposed in the cavity and two electric sliders that are slidably disposed on the annular frame. An insulating strip is disposed on the electric sliders via a rotating shaft, and multiple insulating strips are disposed on the insulating strip along its length.

2. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The annular frame is slidably connected to the protective cylinder via a movable frame. One end of the movable frame is connected to the annular frame, and the other end is equipped with a toothed plate. A fixed frame is installed on the movable block. A gear 1 that meshes with a rack plate 1 is installed between the fixed frames via a driven shaft. The bottom of the gear 1 meshes with a rack plate 2 that is fixed to the bottom frame.

3. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The hot press block contains a resistance wire for generating heat.

4. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The rotating shafts on the two electric sliders are used for unwinding and rewinding the insulating tape, respectively, and the rotating shafts are driven by a drive motor.

5. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The insulating tape has adhesive on the side closest to the optical cable.

6. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The axis of the ring frame coincides with the axis of the protective cylinder.

7. The anti-oxidation device for laser welding of OPGW optical cable optical units according to claim 1, characterized in that: The through slot is a coaxial through hole used to allow the optical cable to pass through the protective cylinder. The protective cylinders can be brought into contact with each other or separated under the drive of a bidirectional cylinder.

8. A method for preventing oxidation during laser welding of OPGW optical fiber unit cells, comprising an anti-oxidation device for laser welding of OPGW optical fiber unit cells as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Optical cable insertion and separation from protective cylinder: The optical cable is inserted into the cavity through the through groove, and the telescopic end of the bidirectional cylinder drives the moving block to separate, so that the protective cylinder is separated to make way for the laser. S2: Inert gas injection and welding: Inert gas is pumped in through the air inlet, and the electric slider drives the laser welding machine to rotate circumferentially. The laser passes through the gap and irradiates the optical cable connection for welding. S3: Optical cable fixing and sealing: The telescopic end of the dual-axis cylinder pushes the limiting plate to squeeze and fix the optical cable. When the protective cylinder separates, the ring frame moves synchronously to avoid blocking the laser. S4: Insulation tape application and hot pressing: The electric slider drives the rotating shaft to wind the insulating tape, and the hot pressing block heats and presses the insulation tape to ensure a seal and prevent oxidation.

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