An underground karst cave optical fiber detection device

Abstract

The present invention relates to the technical field of underground karst cave detection, and specifically relates to an optical fiber detection device for underground karst caves, which includes a support frame. A connecting cross plate is fixed on the rear side surfaces of the symmetric support frames, and an optical fiber detector is fixed on the connecting cross plate. The optical fiber detector includes a data acquisition device. One end of an optical fiber wire is connected to an optical fiber probe, and the other end of the optical fiber wire is connected to a light source. Symmetric rotating lead screws are rotatably arranged in rotating cavities formed on the inner side surfaces of the symmetric support frames. Screw blocks are sleeved on the symmetric rotating lead screws through screw nuts. Electric push rods are fixed on the end faces of the symmetric screw blocks, and the end face of the piston rod of the electric push rod is connected to an arc-shaped clamping plate through a connecting block. The symmetric arc-shaped clamping plates enclose a circular ring shape for clamping and fixing an anti-collision conduit; the present invention will not cause damage to the inserted optical fiber probe due to protruding gravel on the inner wall of the drilled hole, thereby facilitating the optical fiber detector to measure the size and shape of the underground karst cave.

Description

Technical Field

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

[0002] In areas where karst caves are well developed, all parties involved in the construction have invested a lot of manpower, financial resources and time in preliminary exploration, detailed exploration and advance drilling of pile positions in order to ensure the safety of the construction project. The purpose is to find out the development of unfavorable geological bodies such as caves and weak interlayers under the site and pile positions.

[0003] When it is necessary to use a fiber optic detector to detect the size and shape of an underground cave, since the cave is below the surface, construction workers need to first drill a hole on the surface of the formation for the fiber optic probe to enter, and then extend the fiber optic probe of the fiber optic detector through the hole into the cave. The sound waves emitted by the fiber optic probe will then 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 a data acquisition device, thereby facilitating the detection of the size and shape of the underground cave.

[0004] When the fiber optic probe is inserted into the cave through a borehole, the inner wall of the borehole is not smooth, which may cause the protruding gravel on the inner wall of the borehole to interfere with the fiber optic probe or the fiber optic probe may hit the protruding gravel when inserted, which may easily cause damage to the fiber optic probe or the fiber optic wire, thereby affecting the accurate measurement of underground caves by the fiber optic detection device. Summary of the invention

[0005] The object of the present invention is to provide an underground cave optical fiber detection device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underground cave fiber optic detection device, comprising a support frame, a connecting cross plate is symmetrically fixed to the rear side of the support frame, and a fiber optic detector is fixed on the connecting cross plate, the fiber optic detector comprises a data acquisition device, the data acquisition device is connected to the fiber optic wire through a photoelectric detector and a coupler, one end of the fiber optic wire is connected to a fiber optic probe, and the other end of the fiber optic wire is connected to a light source, and a guiding and anti-collision mechanism is arranged on the support frame, and the guiding and anti-collision mechanism is used to guide and prevent the fiber optic probe inserted into the surface cave, so as to prevent the fiber optic probe or the fiber optic wire from being hit and broken.

[0007] Furthermore, the guide anti-collision mechanism includes a rotating screw, a screw slider, an electric push rod, a connecting block, an arc-shaped clamping plate, a fixed block, an anti-collision guide tube and an arc-shaped slide bar. The symmetrical rotating screw is rotatably arranged in a rotating cavity opened on the inner side of the symmetrical support frame, and the output shaft of the driving motor fixed on the top surface of the support frame is connected to the rotating screw. The symmetrical rotating screws are all sleeved with screw sliders through screw nuts, and the screw sliders are slidably arranged in the rotating cavity. The end faces of the symmetrical screw sliders are all fixed with electric Push rod, and the piston rod end face of the electric push rod is connected with an arc-shaped clamping plate through a connecting block, the bottom end faces of the symmetrical rotating chamber are fixed with fixed blocks, and the sides of the fixed blocks are also connected with arc-shaped clamping plates through the electric push rod and the connecting block, the symmetrical arc-shaped clamping plates are ring-shaped and used to clamp and fix the anti-collision catheter, the alignment end faces of the symmetrical arc-shaped clamping plates are provided with arc-shaped guide grooves, and arc-shaped slides are inserted in the symmetrical arc-shaped guide grooves, and the two ends of the arc-shaped slides are respectively connected to the inner walls of the two arc-shaped guide grooves through springs.

[0008] Furthermore, a suspension guide mechanism is provided on the connecting transverse plate, and the suspension guide mechanism includes a support block, a rotating rod, a winding drum, a pulling rope and a guide slip ring. The support blocks are symmetrically fixed on the connecting transverse plate, and the symmetrical support blocks are directly rotatably provided with a rotating rod. A motor is fixed to the outer end face of one of the support blocks, and the output shaft of the motor is connected to the rotating rod. A winding drum is sleeved on the rotating rod, and a pulling rope is wound on the winding drum. The free end of the pulling rope is connected to a guide slip ring, and the guide slip ring is slidably inserted into the anti-collision guide tube, and the optical fiber conductor is clamped in the guide slip ring by an elastic clamping assembly.

[0009] Furthermore, the elastic clamping assembly includes an arc-shaped support plate, an elastic clamping strip, an elastic clamping ring, a toggle strip and a protective sleeve. A plurality of arc-shaped support plates are fixed in a circular array on the upper surface of the guide slip ring, and an elastic clamping strip is elastically connected to the upper end surface of each arc-shaped support plate. Positioning ring grooves are provided on the outer ring surfaces of the arc-shaped support plate and the elastic clamping strip, and an elastic clamping ring is arranged in the positioning ring groove. A notch is provided on the elastic clamping ring, and toggle strips are fixed on the upper surfaces on both sides of the notch. A protective sleeve is sleeved on the optical fiber conductor, and the protective sleeve is in contact with a plurality of shrinking elastic clamping strips.

[0010] Furthermore, a plurality of guide slide bars are fixed in a vertical circumferential array in the anti-collision tube, and guide grooves are provided on the sides of the guide slide bars. A plurality of sliding guide blocks are provided in a circumferential array on the outer ring surface of the guide slip ring, and the plurality of sliding guide blocks are respectively slidably arranged in the guide grooves.

[0011] Furthermore, a threaded hole is provided on the upper end surface of the anti-collision tube, and a threaded connecting pipe is fixed on the lower end surface of the anti-collision tube. The two anti-collision tubes that are fitted together are connected to each other through the threaded connecting pipe and the threaded hole.

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

[0013] 1. The present invention sets a guiding anti-collision mechanism between symmetrical support frames, and the arc-shaped clamping plates symmetrically set on the screw slider through the electric push rod will clamp the anti-collision tube, so that the anti-collision tube can be vertically inserted into the borehole, and the arc-shaped clamping plates symmetrically set on the side of the fixed block through the electric push rod will clamp the anti-collision tube. On the one hand, it can realize the connection and fixation of two anti-collision tubes, and on the other hand, it can play a role in fixing the anti-collision tube inserted into the borehole, thereby facilitating the safe and stable insertion of the optical fiber probe into the cave through the anti-collision tube, and the inserted optical fiber probe will not be damaged by the protruding gravel on the inner wall of the borehole, thereby facilitating the optical fiber detector to measure the size and shape of the underground cave.

[0014] 2. The present invention provides a suspension guide mechanism on the connecting cross plate, and connects the optical fiber wire on the optical fiber probe to the guide slip ring through an elastic clamping assembly. The rotation of the take-up drum can release the wound pulling rope, and then the guide slip ring can drive the clamped optical fiber probe to slide downward in the anti-collision catheter without shaking, so that the optical fiber probe can be stably and safely extended out of the bottom end of the anti-collision catheter without causing damage to the optical fiber probe or the optical fiber wire. When it is necessary to pull out the measured optical fiber probe, the take-up drum is controlled to rotate in the opposite direction, so that the pulling rope can be stably wound on the take-up drum, so that the pulling rope can drive the optical fiber probe to be pulled out of the anti-collision catheter through the guide slip ring, thereby facilitating the stable and safe pulling of the optical fiber probe out of the cave. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a working state diagram of the suspension guide mechanism of the present invention;

[0017] Figure 3 is a cross-sectional view of the anti-collision catheter of the present invention;

[0018] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle part;

[0019] Figure 5 It is a connection schematic diagram of the anti-collision catheter of the present invention.

[0020] In the figure: 1. support frame; 11. rotating cavity; 2. connecting cross plate; 3. data acquisition device; 4. optical fiber conductor; 5. optical fiber probe; 6. guide anti-collision mechanism; 62. screw slider; 63. electric push rod; 64. connecting block; 65. arc clamping plate; 651. arc slide groove; 66. fixing block; 67. anti-collision guide tube; 671. threaded hole; 68. arc slide; 7. suspension guide mechanism; 71. support block; 72. rotating rod; 73. winding drum; 74. pulling rope; 75. guide slip ring; 8. elastic clamping assembly; 81. arc support plate; 82. elastic clamping strip; 83. elastic clamping ring; 84. toggle strip; 85. protective sleeve; 86. guide slide; 861. guide groove; 87. sliding guide block; 9. threaded connecting pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1:

[0023] like Figures 1 to 5As shown in the figure, the present invention provides a technical solution for an underground karst cave optical fiber detection device: It includes a support frame 1. Symmetrically fixed on the rear side of the support frame 1 is a connecting cross plate 2, and a fiber optic detector is fixed on the connecting cross plate 2. The fiber optic detector includes a data acquisition device 3. The data acquisition device 3 is connected to an optical fiber wire 4 through a photodetector and a coupler. One end of the optical fiber wire 4 is connected to an optical fiber probe 5, and the other end of the optical fiber wire 4 is connected to a light source. A guiding and anti-collision mechanism 6 is arranged on the support frame 1. The guiding and anti-collision mechanism 6 is used to guide and prevent collision of the optical fiber probe 5 inserted into the surface karst cave, preventing the optical fiber probe 5 or the optical fiber wire 4 from being damaged due to impact and breakage. Designed by the present invention, when it is necessary to use an optical fiber detector to detect the size and shape of an underground karst cave, since the karst cave is below the ground surface, construction workers need to first drill a hole on the ground surface for the optical fiber probe 5 to enter. Then, the optical fiber probe 5 of the optical fiber detector is inserted through the hole into the karst cave. The sound wave emitted by the optical fiber probe 5 will hit the boundary wall surface of the karst cave, and the boundary wall surface will reflect the sound wave back to the optical fiber probe 5. Then, the data acquisition device 3 analyzes and calculates the data, thereby facilitating the detection of the size and shape of the underground karst cave. When the optical fiber probe 5 is inserted into the karst cave through the hole, since the inner wall of the hole is not smooth, it is easy for the protruding gravel on the inner wall of the hole to interfere with the optical fiber probe 5 or for the optical fiber probe 5 to hit the protruding gravel when inserted, which is likely to damage the optical fiber probe 5 or the optical fiber wire 4, thus affecting the accurate measurement of the underground karst cave by the optical fiber detection device. Therefore, the present invention arranges a guiding and anti-collision mechanism 6 on the support frame 1. When the construction workers complete drilling on the ground surface, at this time, the detection personnel place the support frame 1 on both sides of the hole, then control the guiding and anti-collision mechanism 6 to insert into the hole, and make the bottom end of the guiding and anti-collision mechanism 6 extend into the karst cave. Then, the detection personnel insert the optical fiber probe 5 into the guiding and anti-collision mechanism 6, so that the optical fiber probe 5 can enter the karst cave along the guiding and anti-collision mechanism 6, thus preventing the inner wall of the hole from damaging the inserted optical fiber probe 5 due to protruding gravel, and facilitating the optical fiber detector to measure the size and shape of the underground karst cave.

[0024] Preferably, the guiding and anti-collision mechanism 6 includes a rotating lead screw, a lead screw slider 62, an electric push rod 63, a connecting block 64, an arc-shaped clamping plate 65, a fixed block 66, an anti-collision conduit 67 and an arc-shaped slide bar 68. The symmetrically arranged rotating lead screws are rotatably arranged in the rotating cavities 11 formed on the inner sides of the symmetrically arranged support frames 1, and the output shaft of the driving motor fixed on the top surface of the support frame 1 is connected to the rotating lead screw. The symmetrically arranged rotating lead screws are sleeved with lead screw sliders 62 through lead screw nuts, and the lead screw sliders 62 are slidably arranged in the rotating cavities 11. The end faces of the symmetrically arranged lead screw sliders 62 are fixedly provided with electric push rods 63, and the end face of the piston rod of the electric push rod 63 is connected with an arc-shaped clamping plate 65 through a connecting block 64. The bottom end faces of the symmetrically arranged rotating cavities 11 are fixedly provided with fixed blocks 66, and the side surfaces of the fixed blocks 66 are also connected with an arc-shaped clamping plate 65 through the electric push rod 63 and the connecting block 64. The symmetrically arranged arc-shaped clamping plates 65 enclose a circular ring for clamping and fixing the anti-collision conduit 67. The aligned end faces of the symmetrically arranged arc-shaped clamping plates 65 are provided with arc-shaped chutes 651, and arc-shaped slide bars 68 are inserted into the symmetrically arranged arc-shaped chutes 651. The two ends of the arc-shaped slide bar 68 are respectively connected to the inner walls of the two arc-shaped chutes 651 through springs;In the design of the present invention, when it is necessary to insert the anti-collision conduit 67 into the drill hole to facilitate the safe insertion of the optical fiber probe 5 into the karst cave, the support frame 1 will be erected above the drill hole at this time. Then, the anti-collision conduit 67 is first inserted into the drill hole, and then the piston rods of the electric push rods 63 on the symmetric screw rod sliders 62 are extended, so that the symmetric arc-shaped clamping plates 65 are driven to move closer to each other through the connecting blocks 64, making the inner ring surface of the ring formed by the two arc-shaped clamping plates 65 fit the outer ring surface of the anti-collision conduit 67. Then, the driving motor on the top surface of the support frame 1 is controlled to work, so that the screw rod slider 62 is driven to slide downward along the rotating cavity 11 through the rotating screw rod. Thus, the anti-collision conduit 67 clamped by the arc-shaped clamping plates 65 can be inserted into the drill hole under the drive of the screw rod slider 62. When the drill hole is relatively deep and the anti-collision conduit 67 needs to be spliced, at this time, the piston rods of the electric push rods 63 fixed on the symmetric fixing blocks 66 are extended, so that the symmetric arc-shaped clamping plates 65 are driven to clamp the outer ring surface of the pipe orifice of the inserted anti-collision conduit 67. Then, the piston rods of the electric push rods 63 on the screw rod sliders 62 are contracted, so that the upper arc-shaped clamping plates 65 are driven to disengage from the anti-collision conduit 67. Then, a new anti-collision conduit 67 is connected to the inserted anti-collision conduit 67. Then, the rotating screw rod is controlled to rotate in the reverse direction, so that the symmetric screw rod sliders 62 can drive the symmetric upper arc-shaped clamping plates 65 to move to the outer ring surface of the upper pipe orifice of the newly connected anti-collision conduit 67. Then, the piston rods of the electric push rods 63 on the screw rod sliders 62 are extended, so that the symmetric arc-shaped clamping plates 65 can clamp the outer ring surface of the newly connected anti-collision conduit 67. Then, it is necessary to control the piston rods of the electric push rods 63 on the fixing blocks 66 to contract, so that the lower arc-shaped clamping plates 65 are disengaged from the clamping of the inserted anti-collision conduit 67. Thus, the downward movement of the screw rod slider 62 can drive the anti-collision conduit 67 clamped by the upper arc-shaped clamping plates 65 to continue to be inserted into the drill hole, which is convenient for the guiding and anti-collision mechanism 6 to insert anti-collision conduits 67 of different lengths according to drill holes of different depths. When the anti-collision conduit 67 is inserted into the drill hole, at this time, the lower arc-shaped clamping plate 65 clamps and fixes the anti-collision conduit 67. Then, the optical fiber probe 5 is inserted into the anti-collision conduit 67, so that the optical fiber probe 5 can enter the karst cave downward along the anti-collision conduit 67, which is convenient for the optical fiber probe 5 to adapt to drill holes of different depths for the detection and measurement of the karst cave. When the optical fiber detector completes the detection and measurement of the underground karst cave, at this time, the optical fiber probe 5 is pulled out of the anti-collision conduit 67, and then the arc-shaped clamping plates 65 on the screw rod sliders 62 are controlled to clamp the anti-collision conduit 67, so that the rotating screw rod rotates in the reverse direction, driving the screw rod slider 62 to slide upward along the rotating cavity 11, which is convenient for pulling out and removing the anti-collision conduit 67 inserted into the drill hole, so that the anti-collision conduit 67 can be transferred to the next drill hole to play a role in guiding and anti-collision.;

[0025] Preferably, a suspension guiding mechanism 7 is provided on the connecting cross plate 2. The suspension guiding mechanism 7 includes a support block 71, a rotating rod 72, a winding drum 73, a pulling rope 74 and a guiding sliding ring 75. Support blocks 71 are symmetrically fixed on the connecting cross plate 2, and a rotating rod 72 is rotatably arranged between the symmetric support blocks 71. A motor is fixed on the outer end face of one of the support blocks 71, and the output shaft of the motor is connected to the rotating rod 72. The winding drum 73 is sleeved on the rotating rod 72, and the pulling rope 74 is wound around the winding drum 73. The free end of the pulling rope 74 is connected to the guiding sliding ring 75, and the guiding sliding ring 75 is slidably inserted into the anti-collision conduit 67. An optical fiber wire 4 is clamped in the guiding sliding ring 75 by an elastic clamping assembly 8. In the design of the present invention, when the optical fiber probe 5 needs to be moved downward along the anti-collision conduit 67, since the optical fiber probe 5 is directly manually placed into the anti-collision conduit 67 by the construction worker, if the hand shakes due to the operation error of the construction worker, the optical fiber probe 5 will hit the anti-collision conduit 67, which will affect the safe use of the optical fiber probe 5. Therefore, when the optical fiber probe 5 needs to be placed downward through the anti-collision conduit 67, at this time, the construction worker can pass the optical fiber probe 5 through the guiding sliding ring 75, and the elastic clamping assembly 8 on the guiding sliding ring 75 will clamp the optical fiber wire 4 above the optical fiber probe 5. Then the construction worker places the guiding sliding ring 75 into the anti-collision conduit 67, and then controls the motor on the support block 71 to rotate, so that the rotating rod 72 drives the winding drum 73 to rotate. Thus, the winding drum 73 can release the wound pulling rope 74. Therefore, the guiding sliding ring 75 can drive the optical fiber probe 5 to slide downward along the anti-collision conduit 67 under its own gravity. When the guiding sliding ring 75 slowly descends under the continuous release of the pulling rope 74, at this time, the construction worker can slowly release the optical fiber wire 4, so that it is not necessary for the construction worker to manually pull the optical fiber wire 4 to place the optical fiber probe 5 into the anti-collision conduit 67, and the optical fiber probe 5 can stably and safely extend out of the bottom end of the anti-collision conduit 67 without causing damage to the optical fiber probe 5 or the optical fiber wire 4. When the measured optical fiber probe 5 needs to be pulled out, at this time, the winding drum 73 is controlled to rotate in the reverse direction, so that the pulling rope 74 can be stably wound on the winding drum 73, so that the pulling rope 74 can drive the optical fiber probe 5 to be pulled out of the anti-collision conduit 67 through the guiding sliding ring 75, so as to facilitate the stable and safe pulling out of the optical fiber probe 5 from the karst cave.

[0026] Preferably, the elastic clamping assembly 8 comprises an arc-shaped support plate 81, an elastic clamping strip 82, an elastic clamping ring 83, a toggle strip 84 and a protective sleeve 85. A plurality of arc-shaped support plates 81 are fixed in a circumferential array on the upper surface of the guide slip ring 75, and an elastic clamping strip 82 is elastically connected to the upper end surface of each arc-shaped support plate 81. Positioning ring grooves are provided on the outer ring surfaces of the arc-shaped support plate 81 and the elastic clamping strip 82, and an elastic clamping ring 83 is provided in the positioning ring groove. A notch is provided on the elastic clamping ring 83, and toggle strips 84 are fixed to the upper surfaces on both sides of the notch. A protective sleeve is sleeved on the optical fiber conductor 4. The protective sleeve 85 is in contact with the multiple retractable elastic clamping strips 82; when the optical fiber probe 5 needs to be inserted into the guide slip ring 75, the multiple elastic clamping strips 82 are in an open state, and then the optical fiber probe 5 passes through the elastic clamping strips 82 and the arc-shaped support plate 81 surrounding a cylinder, so that it extends out of the lower surface of the guide slip ring 75, and then the protective sleeve 85 wrapped with the outer ring surface of the optical fiber conductor 4 can be located between the cylinders surrounded by the multiple elastic clamping strips 82, and then the elastic clamping ring 83 with a notch is opened by the toggle bar 84, so that the elastic clamping ring 83 can be pulled out from the multiple elastic clamping strips 82. The arc-shaped support plate 81 is disengaged from the positioning ring groove provided on the outer ring surface, and then the opened elastic clamp ring 83 is pushed upward, so that the elastic clamp ring 83 can move upward into the positioning ring groove provided on the outer ring surface of the elastic clamp strip 82. At this time, the pushing strip 84 is released, so that the elastic clamp ring 83 can clamp the elastic clamp strip 82 and wrap it around the outer ring surface of the protective sleeve 85 under its own contraction, thereby facilitating the optical fiber probe 5 to be clamped and installed on the guide slip ring 75, preventing the optical fiber probe 5 from being disengaged from the guide slip ring 75, thereby affecting the stable and safe guidance of the guide slip ring 75 to the optical fiber probe 5; and when the guide slip ring 75 When pulling it upward from the anti-collision guide tube 67, the optical fiber probe 5 needs to be disengaged from the guide slip ring 75. Then the construction personnel use the toggle bar 84 to push the elastic clamp ring 83 to open its mouth and disengage it from the positioning ring groove formed on the outer ring surface of the multiple elastic clamp strips 82. Then, the elastic clamp ring 83 is pushed downward so that the elastic clamp ring 83 can move downward into the positioning ring groove formed on the outer ring surface of the arc-shaped support plate 81. Then, the multiple elastic clamp strips 82 can open and disengage from the clamping of the protective cover under their own elastic restoring force, so that the construction personnel can quickly remove the optical fiber probe 5 from the guide slip ring 75 for storage.

[0027] Preferably, a plurality of guiding slide bars 86 are fixedly arranged in a vertical circumferential array inside the anti-collision conduit 67, and guide grooves 861 are formed on the side surfaces of the guiding slide bars 86. A plurality of sliding guide blocks 87 are arranged in a circumferential array on the outer circumferential surface of the guiding slide ring 75, and the plurality of sliding guide blocks 87 are respectively arranged to slide in the guide grooves 861. In the design of the present invention, in order to further improve the stability of the fiber optic probe 5 sliding down inside the anti-collision conduit 67, the present invention vertically arranges a plurality of guiding slide bars 86 in a circumferential array inside the anti-collision conduit 67, and arranges a plurality of sliding guide blocks 87 on the outer circumferential surface of the guiding slide ring 75. When the guiding slide ring 75 is inserted into the anti-collision conduit 67, at this time, the plurality of sliding guide blocks 87 will be inserted into the guide grooves 861. Then, when the pulling rope 74 is released, the guiding slide ring 75 can horizontally and stably slide up and down inside the anti-collision conduit 67 through the cooperation of the sliding guide blocks 87 and the guiding slide bars 86, and thus it will not cause the fiber optic probe 5 to hit the inner wall of the anti-collision conduit 67 or cause the fiber optic wire 4 to break due to the inclined sliding of the guiding slide ring 75 inside the anti-collision conduit 67.

[0028] Preferably, a threaded hole 671 is formed on the upper end surface of the anti-collision conduit 67, and a threaded connection pipe 9 is fixed to the lower end surface of the anti-collision conduit 67. The two anti-collision conduits 67 that are attached to each other up and down are connected to each other through the threaded connection pipe 9 and the threaded hole 671. In the design of the present invention, when two anti-collision conduits 67 need to be connected, at this time, the piston rods of the electric push rods 63 installed on the symmetric fixing blocks 66 need to push the symmetric arc-shaped clamping plates 65 to clamp the anti-collision conduit 67 inserted into the drilling hole. Then, the threaded connection pipe 9 at the lower end of the new anti-collision conduit 67 is inserted into the threaded hole 671 at the upper end of the anti-collision conduit 67 inserted into the drilling hole, and then the new anti-collision conduit 67 is rotated so that it can be threadedly connected and matched through the threaded connection pipe 9 and the threaded hole 671, thereby realizing the connection of the two anti-collision conduits 67 and enabling the anti-collision conduit 67 to adapt to drilling holes of different depths.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underground karst cave optical fiber detection device, comprising a support frame (1), characterized in that, a connecting cross plate (2) is fixed to the rear side surfaces of the symmetric support frames (1), and an optical fiber detector is fixed on the connecting cross plate (2). The optical fiber detector comprises a data acquisition device (3), and the data acquisition device (3) is connected to an optical fiber wire (4) through a photodetector and a coupler. One end of the optical fiber wire (4) is connected to an optical fiber probe (5), and the other end of the optical fiber wire (4) is connected to a light source. A guiding and anti-collision mechanism (6) is arranged on the support frame (1), and the guiding and anti-collision mechanism (6) is used to guide and prevent collisions of the optical fiber probe (5) inserted into the surface karst cave, so as to prevent the optical fiber probe (5) or the optical fiber wire (4) from being broken by impact; the guiding and anti-collision mechanism (6) comprises a rotating lead screw, a lead screw slider (62), an electric push rod (63), a connecting block (64), an arc-shaped clamping plate (65), a fixed block (66), an anti-collision conduit (67) and an arc-shaped sliding bar (68). The symmetric rotating lead screws are rotatably arranged in the rotating cavities (11) formed in the inner side surfaces of the symmetric support frames (1), and the output shaft of a driving motor fixed to the top end surface of the support frame (1) is connected to the rotating lead screw. The symmetric rotating lead screws are sleeved with lead screw sliders (62) through lead screw nuts, and the lead screw sliders (62) are slidably arranged in the rotating cavities (11). The end surfaces of the symmetric lead screw sliders (62) are respectively fixed with electric push rods (63), and the piston rod end surfaces of the electric push rods (63) are connected to an arc-shaped clamping plate (65) through a connecting block (64). The bottom end surfaces of the symmetric rotating cavities (11) are respectively fixed with fixed blocks (66), and the side surfaces of the fixed blocks (66) are also connected to the arc-shaped clamping plate (65) through the electric push rods (63) and the connecting blocks (64). The symmetric arc-shaped clamping plates (65) are surrounded into a circular ring for clamping and fixing the anti-collision conduit (67). The aligned end surfaces of the symmetric arc-shaped clamping plates (65) are provided with arc-shaped chutes (651), and arc-shaped sliding bars (68) are inserted into the symmetric arc-shaped chutes (651). The two ends of the arc-shaped sliding bar (68) are respectively connected to the inner walls of the two arc-shaped chutes (651) through springs; The connecting transverse plate (2) is provided with a suspension guide mechanism (7), and the suspension guide mechanism (7) comprises a support block (71), a rotating rod (72), a winding drum (73), a pulling rope (74) and a guide slip ring (75). The connecting transverse plate (2) is symmetrically fixed with support blocks (71), and the symmetrical support blocks (71) are directly rotatably provided with a rotating rod (72). A motor is fixed to the outer end surface of one of the support blocks (71), and the output shaft of the motor is connected to the rotating rod (72). A winding drum (73) is sleeved on the rotating rod (72), and a pulling rope (74) is wound on the winding drum (73). The free end of the pulling rope (74) is connected to a guide slip ring (75), and the guide slip ring (75) is slidably inserted into the anti-collision guide tube (67). The guide slip ring (75) clamps an optical fiber conductor (4) through an elastic clamping component (8).

2. An underground cave optical fiber detection device according to claim 1, Features: The elastic clamping assembly (8) comprises an arc-shaped support plate (81), an elastic clamping strip (82), an elastic clamping ring (83), a toggle strip (84) and a protective sleeve (85). A plurality of arc-shaped support plates (81) are fixed in a circular array on the upper surface of the guide slip ring (75), and an elastic clamping strip (82) is elastically connected to the upper end surface of each arc-shaped support plate (81). The outer ring surfaces of the arc-shaped support plate (81) and the elastic clamping strip (82) are provided with positioning ring grooves, and an elastic clamping ring (83) is arranged in the positioning ring groove. A notch is provided on the elastic clamping ring (83), and toggle strips (84) are fixed on the upper surfaces of both sides of the notch. A protective sleeve (85) is sleeved on the optical fiber conductor (4), and the protective sleeve (85) is in contact with a plurality of shrinking elastic clamping strips (82).

3. The optical fiber detection device for underground caves according to claim 1, Features: A plurality of guide slides (86) are fixed in a vertical circumferential array in the anti-collision guide tube (67), and a guide groove (861) is provided on the side of the guide slides (86); a plurality of sliding guide blocks (87) are arranged in a circumferential array on the outer ring surface of the guide slip ring (75), and the plurality of sliding guide blocks (87) are respectively slidably arranged in the guide grooves (861).

4. The optical fiber detection device for underground caves according to claim 1, Features: The upper end surface of the anti-collision conduit (67) is provided with a threaded hole (671), and the lower end surface of the anti-collision conduit (67) is fixed with a threaded connecting pipe (9), and the two anti-collision conduits (67) that are fitted together are connected to each other via the threaded connecting pipe (9) and the threaded hole (671).

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