An optical fiber detection device for underground caves

Abstract

The present invention relates to the field of optical fiber detection technology, and in particular to an underground cave optical fiber detection device, comprising a main cylinder, an optical fiber probe, a cable, a control box and a winder for reeling in and out the cable, the top end of the outer wall of the main cylinder is hingedly connected with three telescopic legs for support, the optical fiber probe is arranged in the main cylinder, and a transparent glass is fixedly connected to the bottom of the optical fiber probe, one end of the cable is electrically connected to the optical fiber probe, and the other end of the cable is fixedly wound on the winder, a cleaning mechanism for cleaning the optical fiber probe is arranged in the main cylinder, the cleaning mechanism comprises a scraper, a cleaning cylinder is arranged on the inner side of the main cylinder, a threading hole is opened on the top of the cleaning cylinder, the cable passes through the inner side of the threading hole, and the scraper is slidably connected to the inner side of the cleaning cylinder. Through the arrangement of the above structure, the present invention can automatically clean the transparent glass at the bottom of the optical fiber probe while retracting the optical fiber probe, thereby eliminating the need for detection personnel to clean after the detection is completed, saving time and effort, and improving the convenience performance of the device.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber detection, and in particular to an optical fiber detection device for underground caves. Background Art

[0002] During the construction process, in order to ensure the safety of all parties involved in the construction, a large amount of manpower, financial resources and time are invested in preliminary exploration, detailed exploration and advance drilling of the project site. The purpose is to find out the development of unfavorable geological bodies such as caves and weak interlayers under the site and piles. When detecting the size and shape of underground caves, fiber optic detection devices will be used. The sound waves emitted by the fiber optic probe will hit the boundary wall of the cave, and the boundary wall will reflect the sound waves to the fiber optic probe. The data is then analyzed and calculated through the data acquisition device, which facilitates the detection of the size and shape of the underground cave.

[0003] In the prior art, a fiber optic detection device for underground caves is disclosed with publication number CN116540236A. A guiding anti-collision mechanism is arranged between symmetrical support frames. The arc-shaped clamping plates symmetrically arranged on the screw slider by the electric push rod will clamp the anti-collision tube, so that the anti-collision tube can be vertically inserted into the borehole. The arc-shaped clamping plates symmetrically arranged on the side of the fixed block by the electric push rod clamp the anti-collision tube. On the one hand, the two anti-collision tubes can be connected and fixed. On the other hand, the anti-collision tube inserted into the borehole can be fixed, thereby facilitating the safe and stable insertion of the fiber optic probe into the cave through the anti-collision tube. Therefore, the inserted fiber optic probe will not be damaged by the protruding gravel on the inner wall of the borehole, thereby facilitating the fiber optic detector to measure the size and shape of the underground cave.

[0004] Although it can play a protective role in the fiber optic probe, there are still some problems in the actual use. Due to the various climates in the underground cave, such as humid and dry, when the fiber optic probe is inserted into the underground cave for detection or passes through the detection hole, it is easy for the fiber optic probe to adhere to floating dust or moisture and other impurities, thereby affecting the subsequent sound wave detection effect of the fiber optic probe. After each detection, in order to ensure the accuracy of the subsequent detection, the detection personnel are required to clean the fiber optic probe, which is not only time-consuming and labor-intensive, but also greatly reduces the detection efficiency of the device.

[0005] Therefore, an underground cave optical fiber detection device is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an underground cave optical fiber detection device.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: an underground cave fiber optic detection device, including a main tube, a fiber optic probe, a cable, a control box and a reel for retracting and releasing the cable, the top of the outer wall of the main tube is hinged with three telescopic legs for support, the fiber optic probe is arranged in the main tube, and the bottom of the fiber optic probe is fixedly connected with transparent glass, one end of the cable is electrically connected to the fiber optic probe, and the other end of the cable is fixedly wound on the reel, and a cleaning mechanism for cleaning the fiber optic probe is provided in the main tube; The cleaning mechanism includes a scraper, a cleaning cylinder is provided on the inner side of the main cylinder, a threading hole is provided on the top of the cleaning cylinder, the cable passes through the inner side of the threading hole, the scraper is slidably connected to the inner side of the cleaning cylinder, the side wall of the cleaning cylinder is fixedly connected to a circular frame through a pair of support rods, the inner side of the circular frame is rotatably connected to a winding drum, a main rope is wound around the outer wall of the winding drum, one end of the main rope is fixedly connected to the outer wall of the winding drum, an outlet is provided on the side wall of the circular frame, the other end of the main rope passes through the outlet and the side wall of the scraper and is fixedly connected to a straight rope, both ends of the straight rope are fixedly connected to a split rope, an L-shaped groove is provided at the bottom of the cleaning cylinder and on the side away from the scraper, the other end of the split rope passes through the L-shaped groove and is fixedly connected to a limiting block, and the limiting block is fixedly connected to the inner wall of the main cylinder.

[0008] In the above technical solution, further, a fixing plate is fixedly connected to the top of the main cylinder, a plurality of guide rollers are rotatably connected to the front side of the fixing plate, and the cable is wound in an S shape between the plurality of guide rollers, the other end of the cable is electrically connected to the control box, a main roller is rotatably connected to the top inner top of the main cylinder, the cable passes through the outer wall of the main roller, and an L-shaped limiting plate for limiting is fixedly connected to the top of the main cylinder and above the telescopic leg.

[0009] In the above technical solution, further, an upper guide roller is rotatably connected to the inner side of the L-shaped groove, and a top plate is fixedly connected to the inner side of the cleaning cylinder and at both ends of the L-shaped groove, and lower guide rollers are rotatably connected to the bottom of the top plate, and the dividing rope passes through the outer walls of the lower guide rollers on both sides and then through the outer wall of the upper guide roller.

[0010] In the above technical solution, further, a spiral spring is provided on the inner side of the winding drum, and one end of the spiral spring is fixedly connected to the inner side of the winding drum, and the other end of the spiral spring is fixedly connected to the inner side of the circular frame.

[0011] In the above technical solution, further, a sliding groove is provided on the outer wall of the main tube at a position corresponding to the support rod, and the support rod is slidably connected to the inner side of the sliding groove.

[0012] In the above technical solution, further, a notch is opened on the top of the cleaning cylinder, an L-shaped plate is fixedly connected to the inner side of the main cylinder and above the cleaning cylinder, a positioning block is fixedly connected to the outer wall of the main rope, and a return spring is fixedly connected between the scraper side wall and the positioning block.

[0013] In the above technical solution, further, a pair of bottom blocks for limiting the moving position of the scraper are fixedly connected to the inner side of the cleaning cylinder, a brush is fixedly connected to the bottom of the L-shaped plate, and the brush is arranged between the bottom blocks.

[0014] In the above technical solution, further, a plurality of limit blocks for limiting the downward sliding position of the cleaning cylinder are fixedly connected to the inner side of the main cylinder, and the bottom of the cleaning cylinder is in contact with the top of the limit blocks.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention, through the setting of the cleaning mechanism, can automatically clean the transparent glass at the bottom of the optical fiber probe while the optical fiber probe is put away, thereby eliminating the need for detection personnel to clean after the detection is completed, saving time and effort and improving the convenience of the device.

[0016] 2. The present invention can clean the scraper after cleaning by setting structures such as the notch, the L-shaped plate and the brush, so as to prevent impurities on the scraper from continuing to adhere to the transparent glass when returning to its original position, thereby improving the cleaning effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall appearance structure of the detection device of the present invention; Figure 2 The appended Figure 1 A schematic diagram of the partially enlarged structure at center A; Figure 3 It is a schematic diagram of the overall appearance structure of the main cylinder, the fixed plate and the telescopic legs of the present invention; Figure 4 It is a schematic diagram of a partially frontal, fully cutaway three-dimensional structure of the main cylinder of the present invention; Figure 5 The appended Figure 4 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 This is a schematic diagram of the main cylinder of the present invention when viewed from above; Figure 7 This is a schematic diagram of the overall appearance of the cleaning cylinder and the round frame of the present invention; Figure 8 It is a schematic diagram of the overall appearance structure of the round frame, dividing ropes and scraper of the present invention.

[0018] In the figure: 1. main cylinder; 2. optical fiber probe; 3. winder; 4. control box; 5. telescopic leg; 6. fixed plate; 7. guide roller; 8. cable; 9. scraper; 10. cleaning cylinder; 11. threading hole; 12. support rod; 13. round frame; 14. winder; 15. main rope; 16. straight rope; 17. branch rope; 18. L-shaped groove; 19. limit block; 20. upper guide roller; 21. top plate; 22. lower guide roller; 23. volute spring; 24. slide groove; 25. limit block; 26. notch; 27. L-shaped plate; 28. positioning block; 29. ​​reset spring; 30. bottom block; 31. brush; 32. outlet; 33. transparent glass; 34. main roller; 35. L-shaped limit plate. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-Figure 8 The optical fiber detection device for underground caves shown in the figure comprises a main tube 1, an optical fiber probe 2, a cable 8, a control box 4 and a reel 3 for reeling in and out the cable 8. The top end of the outer wall of the main tube 1 is hingedly connected with three telescopic legs 5 for support. The telescopic legs 5 can be freely extended and retracted according to the ground conditions to ensure that the main tube 1 is firmly placed on the ground. The optical fiber probe 2 is arranged in the main tube 1. The optical fiber probe 2 mainly impacts the boundary wall of the cave through the sound waves emitted, and the boundary wall will reflect the sound waves to the optical fiber probe 2. Then, the data is analyzed and calculated by the data acquisition device, so as to facilitate the detection of the size and shape of the underground cave. The bottom of the optical fiber probe 2 is fixedly connected with a transparent glass 33, which can protect the optical fiber probe 2 and facilitate subsequent cleaning. One end of the cable 8 is electrically connected to the optical fiber probe 2, and the other end of the cable 8 is fixedly wound on the reel 3. A cleaning mechanism for cleaning the optical fiber probe 2 is arranged in the main tube 1. A fixing plate 6 is fixedly connected to the top of the main cylinder 1, and a plurality of guide rollers 7 are rotatably connected to the front side of the fixing plate 6, and the cable 8 is wound between the plurality of guide rollers 7 in an S shape, and the other end of the cable 8 is electrically connected to the control box 4. A main roller 34 is rotatably connected to the top of the main cylinder 1, and the cable 8 passes through the outer wall of the main roller 34. The main roller 34 can guide the cable 8 to avoid direct contact between the cable 8 and the corner of the main cylinder 1, thereby improving the service life of the cable 8. An L-shaped limiting plate 35 for limiting is fixedly connected to the top of the main cylinder 1 and located above the telescopic leg 5, and the flipping position of the telescopic leg 5 can be limited by the L-shaped limiting plate 35; When detecting underground caves, construction workers first drill a hole on the surface of the formation for the fiber optic probe 2 to enter, then place the main cylinder 1 on the hole, and open the telescopic legs 5 for support, then control the winder 3 to unwind, pay out the cable 8, and then pass the fiber optic probe 2 through the hole into the underground cave, then control the fiber optic probe 2 to start, the sound waves emitted by the fiber optic probe 2 will hit the boundary wall of the cave, and the boundary wall will reflect the sound waves to the fiber optic probe 2, and then analyze and calculate the data through the data acquisition device, so as to facilitate the detection of the size and shape of the underground cave, and after the detection is completed, control the winder 3 to rotate in the opposite direction to retract the cable 8 and the fiber optic probe 2.

[0022] The cleaning mechanism includes a scraper 9, the top of the scraper 9 is made of rubber material to avoid damage to the transparent glass 33 during the cleaning process, a cleaning cylinder 10 is arranged on the inner side of the main cylinder 1, a threading hole 11 is opened on the top of the cleaning cylinder 10, the threading hole 11 is convenient for the normal passage of the cable 8, the cable 8 passes through the inner side of the threading hole 11, the scraper 9 is slidably connected to the inner side of the cleaning cylinder 10, the side wall of the cleaning cylinder 10 is fixedly connected to a round frame 13 through a pair of support rods 12, the inner side of the round frame 13 is rotatably connected to a winding drum 14, the outer wall of the winding drum 14 is wound with a main rope 15, one end of the main rope 15 is fixedly connected to the outer wall of the winding drum 14, the side wall of the round frame 13 is opened with an outlet 32, the outlet 32 ​​is convenient for the main rope 15 Normal passage, the other end of the main rope 15 passes through the outlet 32 ​​and the side wall of the scraper 9 respectively and is fixedly connected to a straight rope 16, the branch rope 17 is connected to the main rope 15 through the straight rope 16, and will not slide into the scraper 9, playing a limiting role, both ends of the straight rope 16 are fixedly connected to the branch rope 17, and an L-shaped groove 18 is provided at the bottom of the cleaning cylinder 10 and away from the scraper 9. The L-shaped groove 18 can guide the sliding position of the branch rope 17 to prevent the limiting block 19 from directly pulling the scraper 9, so that the scraper 9 cannot pass under the transparent glass 33 for cleaning, and the other end of the branch rope 17 passes through the L-shaped groove 18 and is fixedly connected to the limiting block 19, and the limiting block 19 is fixedly connected to the inner wall of the main cylinder 1; A spiral spring 23 is provided inside the winding drum 14, and one end of the spiral spring 23 is fixedly connected to the inside of the winding drum 14, and the other end of the spiral spring 23 is fixedly connected to the inside of the round frame 13. The arrangement of the spiral spring 23 facilitates pulling the scraper 9 to reset. During the process of retracting the cable 8 and the optical fiber probe 2, after the optical fiber probe 2 is moved out of the surface borehole, the optical fiber probe 2 will move into the main tube 1 and then be inserted into the cleaning tube 10. Then, the top of the optical fiber probe 2 will be pressed against the top of the cleaning tube 10 by pulling the cable 8, and the upward sliding of the optical fiber probe 2 will be restricted. Therefore, under the continued pulling of the cable 8, the optical fiber probe 2 will pull the cleaning tube 10 to move upward at the same time. Since the limiting block 19 at the other end of the branch rope 17 is fixed to the inner wall of the main tube 1, during the upward sliding of the cleaning tube 10, the main rope 15 will be pulled to move by the branch rope 17 and the straight rope 16, thereby pulling out the wound part of the main rope 15 on the winding drum 14, and driving the scraper 9 to pass through the transparent glass 33 at the bottom of the optical fiber probe 2, thereby adhering to the bottom of the transparent glass 33 during the detection process. The impurities are scraped off. During this process, since the other end of the main rope 15 is fixed on the winding drum 14, the winding drum 14 will be driven to rotate at the same time when the main rope 15 is pulled out, and since one end of the spiral spring 23 is fixed to the inner side of the winding drum 14 and the other end is fixed to the inner side of the circular frame 13, the spiral spring 23 will be gradually compressed by the rotation of the winding drum 14, and then the scraper 9 will move from under the transparent glass 33 to the side of the bottom block 30, thereby realizing automatic cleaning of the transparent glass 33 at the bottom of the optical fiber probe 2, so that the detection personnel do not need to clean it after the detection is completed, saving time and effort and improving the convenience of the device. Finally, after the cleaning is completed, the winding machine 3 can be controlled to stop running. If it is used later, the above operation will be repeated in reverse to reset the scraper 9 and take the optical fiber probe 2 out of the cleaning tube 10.

[0023] In order to improve the smoothness of the device during operation, an upper guide roller 20 is rotatably connected to the inner side of the L-shaped groove 18, and a top plate 21 is fixedly connected to the inner side of the cleaning cylinder 10 and at both ends of the L-shaped groove 18, and a lower guide roller 22 is rotatably connected to the bottom of the top plate 21, and the dividing rope 17 passes through the outer walls of the lower guide rollers 22 on both sides and then passes through the outer wall of the upper guide roller 20. The arrangement of the upper guide roller 20 and the lower guide roller 22 can not only guide the sliding of the dividing rope 17 to avoid the dividing rope 17 hindering the normal resetting of the optical fiber probe 2, but also avoid friction between the dividing rope 17 and the corners of the L-shaped groove 18, thereby improving the service life of the dividing rope 17.

[0024] In order to ensure the normal operation of the device, a slide groove 24 is opened on the outer wall of the main cylinder 1 and at a position corresponding to the support rod 12. The support rod 12 is slidably connected to the inner side of the slide groove 24. The setting of the slide groove 24 can avoid hindering the up and down sliding of the support rod 12 and avoid affecting the normal cleaning of the device.

[0025] In order to improve the stability of the device during operation, a number of limit blocks 25 are fixedly connected to the inner side of the main cylinder 1 for limiting the downward sliding position of the cleaning cylinder 10, and the bottom of the cleaning cylinder 10 is in contact with the top of the limit block 25. Through the setting of the limit block 25, the downward sliding position of the cleaning cylinder 10 in the main cylinder 1 can be limited, thereby improving the stability of the device during operation.

[0026] In order to clean the scraper 9 after cleaning, a notch 26 is opened on the top of the cleaning cylinder 10, an L-shaped plate 27 is fixedly connected to the inner side of the main cylinder 1 and located above the cleaning cylinder 10, a positioning block 28 is fixedly connected to the outer wall of the main rope 15, and a reset spring 29 is fixedly connected between the side wall of the scraper 9 and the positioning block 28. The reset spring 29 is set to facilitate the movement of the scraper 9 when the main rope 15 is pulled, and the reset spring 29 can be compressed when the scraper 9 is resisted, so as to ensure the normal movement of the main rope 15; A pair of bottom blocks 30 for limiting the moving position of the scraper 9 are fixedly connected to the inner side of the cleaning cylinder 10, and a brush 31 is fixedly connected to the bottom of the L-shaped plate 27, and the brush 31 is arranged between the bottom blocks 30; The optical fiber probe 2 is pulled by the winder 3 to drive the cleaning tube 10 to move upward for cleaning. When the scraper 9 moves to the side of the bottom block 30, the bottom block 30 will limit the scraper 9 from continuing to move with the main rope 15, so that the cleaning tube 10 continues to slide upward by pulling the optical fiber probe 2, and the brush 31 at the bottom of the L-shaped plate 27 will be inserted into the notch 26. As the optical fiber probe 2 continues to pull the cleaning tube 10 to slide upward, the scraper 9 will gradually compress the reset spring 29, and then the scraper 9 will move to the side of the L-shaped plate 27, so that the impurities cleaned by the scraper 9 will be cleared away by the brush 31, thereby preventing the impurities on the scraper 9 from continuing to adhere to the surface of the transparent glass 33 on the optical fiber probe 2 when returning, thereby improving the cleaning effect of the device.

[0027] Working principle: During the process of retracting the fiber optic probe 2 after the detection is completed, when the fiber optic probe 2 is moved out of the surface borehole, the fiber optic probe 2 will move into the main tube 1 and then be inserted into the cleaning tube 10. Then, the top of the fiber optic probe 2 will be pressed against the top of the cleaning tube 10 by pulling the cable 8, and the upward sliding of the fiber optic probe 2 will be restricted. Therefore, under the continued pulling of the cable 8, the fiber optic probe 2 will pull the cleaning tube 10 to move upward at the same time. Since the limiting block 19 at the other end of the branch rope 17 is fixed on the inner wall of the main tube 1, during the upward sliding process of the cleaning tube 10, the main rope 15 will be pulled by the branch rope 17 and the straight rope 16 to move, thereby winding the main rope 15 on the winding drum 14. The rolled part is pulled out, and the scraper 9 is driven to pass through the transparent glass 33 at the bottom of the optical fiber probe 2, so as to scrape off the impurities adhered to the bottom of the transparent glass 33 during the detection process. In this process, since the other end of the main rope 15 is fixed on the winding drum 14, the winding drum 14 will be driven to rotate at the same time when the main rope 15 is pulled out, and since one end of the vortex spring 23 is fixed to the inner side of the winding drum 14 and the other end is fixed to the inner side of the round frame 13, the vortex spring 23 will be gradually compressed by the rotation of the winding drum 14, and then the scraper 9 is moved away from under the transparent glass 33 and moved to the side of the bottom block 30, so as to realize the automatic cleaning of the transparent glass 33 at the bottom of the optical fiber probe 2; Then the bottom block 30 will restrict the scraper 9 from continuing to move with the main rope 15, thereby pulling the cleaning tube 10 to continue to slide upward through the optical fiber probe 2, and the brush 31 at the bottom of the L-shaped plate 27 will be inserted into the notch 26. As the optical fiber probe 2 continues to pull the cleaning tube 10 to slide upward, the scraper 9 will gradually compress the reset spring 29, and then the scraper 9 will move to the side of the L-shaped plate 27, so that the impurities cleaned by the scraper 9 will be cleaned away by the brush 31, and the above operation will be repeated in reverse when resetting.

[0028] The basic principles, main features and advantages of the present invention are shown and described above.

[0029] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An optical fiber detection device for underground caves, comprising a main tube (1), an optical fiber probe (2), a cable (8), a control box (4), and a reel (3) for reeling in and out the cable (8), characterized in that: The top end of the outer wall of the main cylinder (1) is hingedly connected to three telescopic legs (5) for support, the optical fiber probe (2) is arranged in the main cylinder (1), and the bottom of the optical fiber probe (2) is fixedly connected to a transparent glass (33), one end of the cable (8) is electrically connected to the optical fiber probe (2), and the other end of the cable (8) is fixedly wound on a winding machine (3), and a cleaning mechanism for cleaning the optical fiber probe (2) is provided in the main cylinder (1); The cleaning mechanism comprises a scraper (9), a cleaning cylinder (10) is provided inside the main cylinder (1), a threading hole (11) is provided on the top of the cleaning cylinder (10), the cable (8) passes through the inside of the threading hole (11), the scraper (9) is slidably connected to the inside of the cleaning cylinder (10), a round frame (13) is fixedly connected to the side wall of the cleaning cylinder (10) via a pair of support rods (12), a winding cylinder (14) is rotatably connected to the inside of the round frame (13), a main rope (15) is wound around the outer wall of the winding cylinder (14), one end of the main rope (15) is fixedly connected to the side wall of the cleaning cylinder (10) via a pair of support rods (12), a winding cylinder (14) is rotatably connected to the inside of the circular frame (13), a main rope (15) is wound around the outer wall of the winding cylinder (14), and one end of the main rope (15) is fixedly connected to the side wall of the cleaning cylinder (10). The main rope (15) is fixedly connected to the outer wall of the winding drum (14); an outlet (32) is provided on the side wall of the circular frame (13); the other end of the main rope (15) passes through the outlet (32) and the side wall of the scraper (9) and is fixedly connected to a straight rope (16); both ends of the straight rope (16) are fixedly connected to a branch rope (17); an L-shaped groove (18) is provided at the bottom of the cleaning drum (10) and on a side away from the scraper (9); the other ends of the branch ropes (17) pass through the L-shaped groove (18) and are fixedly connected to a limiting block (19); and the limiting block (19) is fixedly connected to the inner wall of the main drum (1).

2. The optical fiber detection device for underground caves according to claim 1, characterized in that: The top of the main cylinder (1) is fixedly connected to a fixed plate (6), the front side of the fixed plate (6) is rotatably connected to a plurality of guide rollers (7), and the cable (8) is wound in an S shape between the plurality of guide rollers (7), the other end of the cable (8) is electrically connected to the control box (4), the top of the main cylinder (1) is rotatably connected to a main guide roller (34), the cable (8) passes through the outer wall of the main guide roller (34), and the top of the main cylinder (1) and above the telescopic leg (5) are fixedly connected to an L-shaped limit plate (35) for limiting.

3. The optical fiber detection device for underground caves according to claim 1, characterized in that: An upper guide roller (20) is rotatably connected to the inner side of the L-shaped groove (18), and a top plate (21) is fixedly connected to the inner side of the cleaning cylinder (10) and at both ends of the L-shaped groove (18), and lower guide rollers (22) are rotatably connected to the bottom of the top plate (21), and the split rope (17) passes through the outer walls of the lower guide rollers (22) on both sides and then passes through the outer wall of the upper guide roller (20).

4. The optical fiber detection device for underground caves according to claim 1, characterized in that: A spiral spring (23) is provided on the inner side of the winding drum (14), one end of the spiral spring (23) is fixedly connected to the inner side of the winding drum (14), and the other end of the spiral spring (23) is fixedly connected to the inner side of the circular frame (13).

5. The optical fiber detection device for underground caves according to claim 1, characterized in that: A sliding groove (24) is provided on the outer wall of the main cylinder (1) at a position corresponding to the support rod (12), and the support rod (12) is slidably connected to the inner side of the sliding groove (24).

6. The optical fiber detection device for underground caves according to claim 1, characterized in that: A notch (26) is provided at the top of the cleaning cylinder (10); an L-shaped plate (27) is fixedly connected to the inner side of the main cylinder (1) and located above the cleaning cylinder (10); a positioning block (28) is fixedly connected to the outer wall of the main rope (15); and a return spring (29) is fixedly connected between the side wall of the scraper (9) and the positioning block (28).

7. An underground cave optical fiber detection device according to claim 6, characterized in that: A pair of bottom blocks (30) for limiting the moving position of the scraper (9) are fixedly connected to the inner side of the cleaning cylinder (10), a brush (31) is fixedly connected to the bottom of the L-shaped plate (27), and the brush (31) is arranged between the bottom blocks (30).

8. The optical fiber detection device for underground caves according to claim 1, characterized in that: A plurality of limit blocks (25) for limiting the downward sliding position of the cleaning cylinder (10) are fixedly connected to the inner side of the main cylinder (1), and the bottom of the cleaning cylinder (10) is in contact with the top of the limit blocks (25).

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