Gas storage detection device based on optical fiber technology

Abstract

The utility model relates to the technical field of detection, and provides a gas storage detection device based on an optical fiber technology, which comprises fixing devices, a connecting ring, a wiring trolley and a guiding device, the two fixing devices are connected through the connecting ring, the guiding device and the fixing devices are connected through the connecting ring, and the guiding device is arranged in the wiring trolley; according to the utility model, the guiding device is arranged to pull the optical cable, the guiding device is rotated by 90 degrees to facilitate wiring in a horizontal pipeline, the plurality of fixing devices are arranged, when encountering a bent pipeline, the fixing devices are contacted and fixed with the bent pipeline, and the optical cable passes through the smooth inner arc ring with small friction to the optical cable and is not contacted with the pipeline, so that friction and stretching are reduced; and the connecting ring is arranged to connect the fixing device and the wiring trolley, a plurality of fixing points can be arranged, and wiring and recycling are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, in particular to a gas storage detection device based on optical fiber technology. Background Art

[0002] Gas storage, meaning a "container" for storing natural gas. Its main functions are to regulate gas peak demand, provide safe gas supply, strategic reserve, improve pipeline utilization factor, save investment, and reduce gas transmission costs. The demand in the urban gas market fluctuates greatly with the seasons and day and night. Underground gas storage is used to store the surplus gas in the gas transmission system during low-peak gas demand, and to supplement the pipeline gas supply during peak gas demand, solving the problem of gas peak regulation.

[0003] The existing gas storage detection technology utilizes the change in optical fiber length caused by heat exchange between production gas and wellbore, records and analyzes it through DAS, observes tiny temperature changes, analyzes the optical fiber length change signal, identifies the location distribution and flow area of ​​gas in the wellbore, deeply analyzes the signal, quantitatively evaluates the flow speed of gas in the wellbore, and provides accurate fluid dynamic information. The existing technology uses an optical cable conveyor to pull one end of the optical cable and then send it to the gas storage for detection. The optical cable cannot be restricted, and the safety valves, packers, dart seats and other tools are densely distributed in the oil pipes of the injection and production wells. There are many variable diameters in the logging channel. In the operation of long horizontal sections in deep wells, the optical cable has no protective structure and is easily affected by stretching and wear, making it difficult to deploy and recover. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a gas storage detection device based on optical fiber technology to solve the problems in the prior art such as the presence of multiple variable diameters in logging channels, the susceptibility of optical fibers to stretching and wear during operations in long horizontal sections of deep wells, and the difficulty in deployment and recovery.

[0005] A gas storage reservoir detection device based on optical fiber technology comprises: a fixing device, a connecting ring, a wiring vehicle, and a guiding device. Two fixing devices are connected via a connecting ring, the guiding device and the fixing device are connected via a connecting ring, and the guiding device is installed in the wiring vehicle.

[0006] Preferably, the fixing device comprises an inner arc ring and a friction plate, four groups of fixing blocks are evenly arranged on the circumference of the inner arc ring, the fixing blocks are rotatably connected with a connecting rod, the friction plate is arc-shaped, a round rod is arranged between the protruding parts of the friction plate, two sliders are slidably connected to the round rod, the sliders are rotatably connected to the connecting rod, a spring is fixedly connected between the sliders, the spring is arranged on the round rod, the spring is in a stretched state, and the inner arc ring is provided with a round hole on both sides of the fixing block.

[0007] Preferably, the connecting ring includes a hollow ring, and four groups of trigger blocks are evenly arranged on the circumference of the hollow ring. Telescopic rod one and telescopic rod three are provided above one side of the trigger block. Telescopic rod two and telescopic rod three are telescoped in circular hole one, and telescopic rod two is telescoped in circular hole one, and telescopic rod one is located above the connecting rod.

[0008] Preferably, four universal wheels are provided at the bottom of the wiring vehicle, a limit plate is provided inside the wiring vehicle, a square groove 1 is provided in the limit plate, a straight groove 1 is provided in the square groove 1, straight groove 2 is provided in the middle part of both sides of the straight groove 1, a spring 2 is provided in the straight groove 2, one end of the spring 2 is fixedly connected to a "T"-shaped baffle plate, and the "T"-shaped part of the "T"-shaped baffle plate is slidably connected to the straight groove 2.

[0009] Preferably, the wiring cart is provided with straight grooves three on two sides perpendicular to the limit plate, and a spring three is fixedly connected to the bottom of the straight grooves three, the wiring cart is provided with square grooves two on one side of the straight grooves three, and a baffle is rotatably connected in the square grooves two, the wiring cart is provided with strip grooves at the bottom of the square grooves two, and a trigger bar is slidably connected in the strip grooves, and the trigger bar is located below the baffle, and the wiring cart is rotatably connected to a gear on one side of the straight grooves three, the wiring cart is provided with a fixing frame above the gear, and a motor is installed on the fixing frame, the driving shaft of the motor is fixedly connected to the gear, and the two gears are meshed with gear rings, the wiring cart is provided with an empty slot on one side of the limit plate, and an electromagnet is installed on the top of the wiring cart.

[0010] Preferably, the guiding device comprises a guiding block, to which an optical cable holder is fixedly connected, sliding columns are fixedly connected on both sides of the guiding block, the sliding columns are slidably connected to straight groove three, the sliding columns are provided with gear teeth, the guiding block is fixedly connected with an "L"-shaped slider on both sides perpendicular to the sliding column, a clamping block one is provided at one end of the "L"-shaped slider, a sliding groove is provided on the clamping block one, a clamping block two is slidably connected in the sliding groove, and the "L"-shaped slider is slidably connected to square groove one and straight groove one.

[0011] Preferably, the optical cable fixer comprises a hollow cylinder, a hollow ring is fixedly connected inside the hollow cylinder, a clamping block is rotatably connected to the hollow ring, a double-layer hollow ring is provided inside the hollow ring, a hollow block is rotatably connected inside the double-layer hollow ring, the hollow block is slidably connected to the clamping block, a convex tooth block is provided on the side of the double-layer hollow ring, an arc-shaped groove is provided on the side of the hollow cylinder, an arc-shaped groove is provided below the arc-shaped groove, a spring four is provided in the arc-shaped groove, one end of the spring four is fixedly connected to an arc-shaped tooth ring, the arc-shaped tooth ring is meshed with the convex tooth block, and a circular hole two is provided on the head of the optical cable fixer.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention realizes automatic wiring by setting a guiding device to pull the optical cable and using a wiring vehicle to wire in a horizontal pipeline, which can bypass complex pipelines. The guiding device is perpendicular and fixed to the wiring vehicle to prevent the optical cable from deviating. The guiding device determines whether it has reached the bottom of the pipeline according to the trigger plate in the wiring vehicle and rotates the guiding device 90° to facilitate wiring in the horizontal pipeline.

[0014] 2. The present invention is provided with a plurality of fixing devices. When encountering a curved pipe, the outermost connecting ring causes the telescopic rod 1 to automatically extend upward, thereby releasing the fixation of the outermost connecting rod. Then, the two sliders slide on the round rod 3 under the action of the taut spring 1, thereby driving the two connecting rods to rotate and tend to be parallel through the round rods 1 and 2. In this process, the four friction plates are pushed outward to contact and fix the curved pipe, so that the optical cable passes through the smooth inner arc ring with low friction on the optical cable without contacting the pipe, reducing friction and stretching.

[0015] 3. The present invention sets a connecting ring, which shrinks the telescopic rod 2 after fixation, separates it from the whole, and fixes it at the bend together with the outermost fixing device. The wiring vehicle continues to move into the pipeline and lays wiring, and multiple fixing points can be arranged, which facilitates wiring and recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the device of the present invention;

[0017] Figure 2 It is a three-dimensional diagram of the connection between the fixing device and the guiding device in the present invention;

[0018] Figure 3 is a three-dimensional diagram of the fixing device and the connecting ring in the present invention;

[0019] Figure 4 is a three-dimensional diagram of the guiding device of the present invention;

[0020] Figure 5 The present invention Figure 4 A partial enlarged view of middle A;

[0021] Figure 6 It is a three-dimensional view of the interior of the wiring vehicle of the present invention;

[0022] Figure 7 is a cross-sectional view of the wiring vehicle and the guide device in the present invention;

[0023] Figure 8 The present invention Figure 7 A partial enlarged view of B in the middle;

[0024] Fig. 9 is a cross-sectional view of one side of the wiring vehicle of the present invention;

[0025] Fig.10 is another cross-sectional view of the wiring vehicle and the guide device connected in the present invention;

[0026] Fig.11 It is another connection stereogram of the wiring vehicle and the guiding device in the present invention.

[0027] In the figure:

[0028] 1. Fixing device; 11. Inner arc ring; 12. Friction plate; 13. Fixing block; 14. Connecting rod; 15. Round rod; 16. Slider; 17. Spring 1; 18. Round hole 1; 2. Connecting ring; 21. Hollow ring; 22. Trigger block; 23. Telescopic rod 1; 24. Telescopic rod 2; 25. Telescopic rod 3; 3. Wiring cart; 31. Universal wheel; 32. Limiting plate; 33. Square slot 1; 331. Straight slot 1; 332. Straight slot 2; 333. Spring 2; 334. "T" shaped baffle plate; 34. Straight slot 3; 341. Spring 3; 342. Square slot 2; 343. Baffle plate; 344. Strip slot; 345 , trigger bar; 346, gear; 347, fixing frame; 348, motor; 349, gear ring; 35, empty slot; 36, electromagnet; 4, guiding device; 41, guiding block; 42, cable holder; 421, hollow cylinder; 422, hollow circular ring; 423, clamping block; 424, double-layer hollow ring; 425, hollow square block; 426, convex tooth block; 427, arc-shaped empty slot; 428, arc-shaped slot; 429, spring four; 4210, arc-shaped gear ring; 4211, circular hole two; 43, sliding column; 431, gear teeth; 44, "L"-shaped slider; 45, block one; 46, sliding groove; 47, block two. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] The present invention provides a gas storage reservoir detection device based on optical fiber technology, comprising: a fixing device 1, a connecting ring 2, a wiring vehicle 3, and a guiding device 4, wherein the two fixing devices 1 are connected via the connecting ring 2, the guiding device 4 and the fixing device 1 are connected via the connecting ring 2, and the guiding device 4 is installed in the wiring vehicle 3.

[0031] As an embodiment of the present invention, the fixing device 1 includes an inner arc ring 11 and a friction plate 12. Four groups of fixing blocks 13 are evenly arranged on the circumference of the inner arc ring 11. The fixing blocks 13 are rotatably connected to a connecting rod 14. The friction plate 12 is arc-shaped. A round rod 15 is provided between the protruding parts of the friction plate 12. Two sliders 16 are slidably connected to the round rod 15. The sliders 16 are rotatably connected to the connecting rod 14. A spring 17 is fixedly connected between the sliders 16. The spring 17 is sleeved on the round rod 15. The spring 17 is in a stretched state. The inner arc ring 11 is provided with a round hole 18 on both sides of the fixing block 13.

[0032] As an embodiment of the present invention, the connecting ring 2 includes a hollow ring 21, and four groups of trigger blocks 22 are evenly arranged on the circumference of the hollow ring 21. A telescopic rod 1 23 is provided above one side of the trigger block 22, and a telescopic rod 24 and a telescopic rod 3 25 are provided below both sides of the trigger block 22. The telescopic rod 24 and the telescopic rod 3 25 are telescoped in the circular hole 18, and the telescopic rod 1 23 is located above the connecting rod 14.

[0033] As an embodiment of the present invention, four universal wheels 31 are provided at the bottom of the wiring vehicle 3, a limiting plate 32 is provided inside the wiring vehicle 3, a square groove 33 is provided in the limiting plate 32, a straight groove 331 is provided in the square groove 33, straight grooves 332 are provided in the middle parts of both sides of the straight groove 331, a spring 333 is provided in the straight groove 332, one end of the spring 333 is fixedly connected to a "T"-shaped baffle plate 334, and the "T"-shaped part of the "T"-shaped baffle plate 334 is slidably connected to the straight groove 332.

[0034] As an embodiment of the present invention, the wiring vehicle 3 is provided with straight grooves three 34 on two surfaces perpendicular to the limit plate 32, and a spring three 341 is fixedly connected to the bottom of the straight groove three 34, and a square groove two 342 is provided on one side of the straight groove three 34 of the wiring vehicle 3, and a baffle 343 is rotatably connected in the square groove two 342, and a strip groove 344 is provided on the bottom of the square groove two 342 of the wiring vehicle 3, and a trigger bar 345 is slidably connected in the strip groove 344, and the trigger bar 345 is located below the baffle 343, and a gear 346 is rotatably connected to the wiring vehicle 3 on one side of the straight groove three 34, and a fixing frame 347 is provided above the gear 346, and a motor 348 is installed on the fixing frame 347, and the driving shaft of the motor 348 is fixedly connected to the gear 346, and a gear ring 349 is meshed and transmitted on the two gears 346, and an empty slot 35 is provided on one side of the limit plate 32 of the wiring vehicle 3, and an electromagnet 36 is installed on the top of the wiring vehicle 3.

[0035] As an embodiment of the present invention, the guiding device 4 includes a guiding block 41, to which an optical cable holder 42 is fixedly connected, sliding columns 43 are fixedly connected on both sides of the guiding block 41, the sliding columns 43 are slidably connected to the straight groove three 34, and gear teeth 431 are provided on the sliding columns 43. The guiding block 41 is fixedly connected to an "L"-shaped slider 44 on both sides perpendicular to the sliding column 43, and a clamping block 45 is provided at one end of the "L"-shaped slider 44. A sliding groove 46 is provided on the clamping block 45, and a clamping block 2 47 is slidably connected in the sliding groove 46. The "L"-shaped slider 44 is slidably connected to the square groove one 33 and the straight groove one 331.

[0036] As an embodiment of the present invention, the optical cable holder 42 includes a hollow cylinder 421, a hollow ring 422 is fixedly connected inside the hollow cylinder 421, a clamping block 423 is rotatably connected to the hollow ring 422, a double-layer hollow ring 424 is provided inside the hollow ring 422, a hollow block 425 is rotatably connected inside the double-layer hollow ring 424, the hollow block 425 is slidably connected to the clamping block 423, and the double-layer hollow ring A convex tooth block 426 is provided on the side of 424, an arc-shaped slot 427 is provided on the side of the hollow cylinder 421, an arc-shaped slot 428 is provided below the arc-shaped slot 427, a spring 429 is provided in the arc-shaped slot 428, one end of the spring 429 is fixedly connected to an arc-shaped tooth ring 4210, the arc-shaped tooth ring 4210 is meshed with the convex tooth block 426, and a circular hole 4211 is provided on the head of the optical cable fixer 42.

[0037] Specific working principle:

[0038] like Figure 4 , 5 As shown, in this embodiment, firstly, one end of the optical cable is passed through the fixing device 1 and the connecting ring 2 and sent into the optical cable fixing device 42 in the guiding device 4 for fixing, and the optical cable is placed in the middle of the three clamping blocks 423 and the convex tooth block 426 is rotated, thereby rotating the double-layer hollow ring 424, and then the three clamping blocks 423 are rotated from the edge to the middle, and the optical cable is clamped by the head, as shown in FIG. Figure 5 As shown, the teeth on the rotating convex tooth block 426 squeeze the arc-shaped tooth ring 4210. Since a spring 429 is provided under the arc-shaped tooth ring 4210, the teeth on the convex tooth block 426 pass over the teeth on the arc-shaped tooth ring 4210 and are stuck by the teeth on the arc-shaped tooth ring 4210 after stopping rotating. Then, the suspension rope with a magnet on the head is adsorbed and connected with the electromagnet 36 on the top of the wiring vehicle 3, and the whole device is lowered into the well. After lowering, the electromagnet 36 is powered off to separate the suspension rope from the wiring vehicle 3.

[0039] like Figure 6-10As shown, the slide column 43 in the guide device 4 is between the baffle 343 and the spring three 341, and the block one 45 and the block two 47 in the "L"-shaped slider 44 are respectively located on both sides of the "T"-shaped baffle 334, and the guide block 41 is located between the two limit plates 32, so that the guide device 4 is completely fixed to ensure that the optical cable will not be damaged due to shaking during the lowering of the wiring vehicle 3. When the device is lowered to the horizontal plane of the pipeline in the well, the trigger bar 345 is pushed upward to push the baffle 343 to rotate, so that the baffle 343 further presses the slide column 43, so that the entire guide device 4 moves downward, so that the block two 47 passes through the "T"-shaped baffle. The "T"-shaped baffle 334 is moved downward due to gravity and fits together with the card block 1 45. As the trigger bar 345 continues to rise, the baffle 343 rotates 90° to disengage from the pressing of the slide post 43, so that the slide post 43 rises due to the elastic force of the spring 341, thereby causing the entire guide device 4 to rise, thereby causing the card block 1 45 and the card block 2 47 to pass through the "T"-shaped baffle 334 at the same time, thereby causing the guide device 4 to be released from fixation and rise due to the elastic force of the spring 341. During the rising process of the guide device 4, the gear 431 on the slide post 43 meshes with the gear 346, thereby causing the guide device 4, the fixing device 1, and the connecting ring 2 to rotate 90°. Fig.11 As shown, the optical cable holder 42 is placed on the empty slot 35, and then the horizontal pipeline is wired. During the wire collection process, the motor 348 is started to rotate the guide device 4, the fixing device 1, and the connecting ring 2 90° to return to their original positions;

[0040] like Figure 1-3 As shown, when encountering a curved pipe, the curve sensor in the universal wheel 31 transmits information to the connecting ring 2, and the connecting ring 2 controls the telescopic rod 23 to automatically extend upward, thereby releasing the fixation of the outermost connecting rod 14, and then the two sliders 16 slide on the round rod 15 under the action of the tightened spring 17, thereby driving the two connecting rods 14 to rotate and tend to be parallel. In this process, the four friction plates 12 are pushed outward to contact and fix the curved pipe. After the fixation, the connecting ring 2 shrinks the telescopic rod 25, separates from the fixing device 1 on one side, and fixes it at the curved pipe together with the triggered fixing device 1. The wiring vehicle 3 continues to move into the pipe and lay cables. The optical cable passes through the smooth inner arc ring 11 with low friction on the optical cable, does not contact the pipe, avoids friction and stretching, and multiple fixing points can be arranged;

[0041] When recovery is required, the wiring vehicle 3 returns along the original route and recovers the fixing device 1 and the connecting ring 2 at each bend. When the wiring vehicle 3 returns to the bend, the fixing device 1 or the optical cable fixture 42 on the wiring vehicle 3 cooperates with the fixed connecting ring 2, and the fixed connecting ring 2 extends the telescopic rod three 25 and cooperates with the circular hole one 18 or the circular hole two 4211 on the fixing device 1 or the hollow cylinder 421, so that the wiring vehicle 3 is reconnected with the fixed fixing device 1 and the connecting ring 2. At the same time, the fixed connecting ring 2 controls the telescopic rod one 23 to contract, thereby separating the two connecting rods 14 and then retracting the friction plate 12.

[0042] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gas storage reservoir detection device based on optical fiber technology, comprising: A fixing device (1), a connecting ring (2), a wiring vehicle (3), and a guiding device (4), characterized in that the two fixing devices (1) are connected via a connecting ring (2), the guiding device (4) and the fixing device (1) are connected via a connecting ring (2), and the guiding device (4) is installed in the wiring vehicle (3).

2. The gas storage detection device based on optical fiber technology according to claim 1, characterized in that: The fixing device (1) comprises an inner arc ring (11) and a friction plate (12). Four groups of fixing blocks (13) are evenly arranged on the circumference of the inner arc ring (11). The fixing blocks (13) are rotatably connected to a connecting rod (14). The friction plate (12) is arc-shaped. A round rod (15) is arranged between the protruding parts of the friction plate (12). Two sliders (16) are slidably connected to the round rod (15). The sliders (16) are rotatably connected to the connecting rod (14). A spring (17) is fixedly connected between the sliders (16). The spring (17) is sleeved on the round rod (15). The spring (17) is in a stretched state. The inner arc ring (11) is provided with round holes (18) on both sides of the fixing blocks (13).

3. The gas storage detection device based on optical fiber technology according to claim 2, characterized in that: The connecting ring (2) comprises a hollow ring (21), four groups of trigger blocks (22) are evenly arranged on the circumference of the hollow ring (21), a telescopic rod 1 (23) is arranged above one side of the trigger block (22), and a telescopic rod 2 (24) and a telescopic rod 3 (25) are arranged below both sides of the trigger block (22), the telescopic rod 2 (24) and the telescopic rod 3 (25) are telescopic in the circular hole 1 (18), and the telescopic rod 1 (23) is located above the connecting rod (14).

4. The gas storage detection device based on optical fiber technology according to claim 1, characterized in that: The wiring vehicle (3) is provided with four universal wheels (31) at the bottom, and a limiting plate (32) is provided inside the wiring vehicle (3). A square groove (33) is provided inside the limiting plate (32), and a straight groove (331) is provided inside the square groove (33). Straight grooves (332) are provided in the middle parts of both sides of the straight groove (331), and springs (333) are provided in the straight grooves (332). One end of the springs (333) is fixedly connected to a "T"-shaped baffle (334), and the "T"-shaped part of the "T"-shaped baffle (334) is slidably connected to the straight grooves (332).

5. The gas storage detection device based on optical fiber technology according to claim 4, characterized in that: The wiring vehicle (3) is provided with straight grooves (34) on two surfaces perpendicular to the limiting plate (32), and a spring (341) is fixedly connected to the bottom of the straight groove (34). The wiring vehicle (3) is provided with square grooves (342) on one side of the straight grooves (34), and a baffle (343) is rotatably connected in the square grooves (342). The wiring vehicle (3) is provided with strip grooves (344) at the bottom of the square grooves (342), and a trigger bar (345) is slidably connected in the strip grooves (344), and the trigger bar (345) is located below the baffle (343). The wiring vehicle (3) is rotatably connected to two gears (346) on both sides of the straight groove (34), and a fixing frame (347) is provided on the wiring vehicle (3) above the gear (346). A motor (348) is installed on the fixing frame (347). The driving shaft of the motor (348) is fixedly connected to the gear (346). A gear ring (349) is meshed and transmitted on the two gears (346). The wiring vehicle (3) is provided with an empty slot (35) on one side of the limit plate (32), and an electromagnet (36) is installed on the top of the wiring vehicle (3).

6. The gas storage detection device based on optical fiber technology according to claim 5, characterized in that: The guide device (4) comprises a guide block (41), the guide block (41) is fixedly connected to an optical cable holder (42), the guide block (41) is fixedly connected to sliding columns (43) on both sides, the sliding columns (43) are slidably connected to the straight groove three (34), the sliding columns (43) are provided with gear teeth (431), the guide block (41) is fixedly connected to an "L"-shaped slider (44) on both sides perpendicular to the sliding column (43), one end of the "L"-shaped slider (44) is provided with a clamping block one (45), the "L"-shaped slider (44) is provided with a sliding groove (46) on the clamping block one (45), the sliding groove (46) is slidably connected to a clamping block two (47), and the "L"-shaped slider (44) is slidably connected to the square groove one (33) and the straight groove one (331).

7. The gas storage detection device based on optical fiber technology according to claim 6, characterized in that: The optical cable holder (42) comprises a hollow cylinder (421), a hollow ring (422) is fixedly connected inside the hollow cylinder (421), a clamping block (423) is rotatably connected to the hollow ring (422), a double-layer hollow ring (424) is provided inside the hollow ring (422), a hollow block (425) is rotatably connected inside the double-layer hollow ring (424), the hollow block (425) is slidably connected to the clamping block (423), and a convex groove (423) is provided on the side of the double-layer hollow ring (424). The tooth block (426) is provided with an arc-shaped slot (427) on the side of the hollow cylinder (421), and the hollow cylinder (421) is provided with an arc-shaped slot (428) below the arc-shaped slot (427). A spring (429) is provided in the arc-shaped slot (428), and one end of the spring (429) is fixedly connected with an arc-shaped tooth ring (4210), and the arc-shaped tooth ring (4210) is meshed with the convex tooth block (426), and a round hole (4211) is provided at the head of the optical cable fixer (42).

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