A tunnel automatic inspection system and automatic inspection method

Abstract

The present application belongs to the technical field of safety inspection, and discloses an automatic tunnel inspection system and automatic inspection method, including a guide rail fixed to the edge of the tunnel along the length direction of the tunnel, a sliding seat slidably matched with the guide rail provided on the guide rail, a mounting seat fixed on the sliding seat, and a camera assembly on a device terminal for conducting safety inspections in the tunnel and transmitting inspection information to the surrounding on-duty personnel. In the present application, the sliding seat, the mounting seat and the camera assembly are all located on the guide rail, and the guide rail has a certain limiting effect on the movement of the sliding seat, thereby avoiding the situation in the traditional technology that the camera assembly used for safety inspections is sucked toward the center of the tunnel by the suction force generated by the driving of the vehicle, thereby extending the service life of the inspection equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of safety inspection, and in particular to an automatic tunnel inspection system and an automatic inspection method. Background Art

[0002] The quality of tunnel lining is directly related to the reliability of the tunnel during operation. With the rapid development of my country's rail transit, the inspection of railway tunnel quality has become increasingly important.

[0003] The existing tunnel inspection method usually uses an automatic patrol device for inspection. The patrol device can move in the tunnel to conduct safety inspections. However, when a vehicle passes through the tunnel at a high speed, it is easy to generate suction toward the center of the lane, thereby sucking the automatic patrol device toward the center of the lane. After long-term use, the patrol device is likely to lose its original cruising track and may even be crushed by moving vehicles. Therefore, it is necessary to improve the design of related technologies. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a tunnel automatic inspection system and an automatic inspection method.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: an automatic tunnel inspection system, comprising a guide rail fixed to the edge of the tunnel along the length direction of the tunnel, a sliding seat slidably matched with the guide rail is provided on the guide rail, a mounting seat is fixed on the sliding seat, and a camera component is provided on the mounting seat for performing safety inspections in the tunnel and transmitting the inspection information to a device terminal controlled by surrounding on-duty personnel.

[0006] By adopting the above technical solution, the sliding seat, the mounting seat and the camera assembly are all located on the guide rail. The guide rail plays a certain limiting role in the movement of the sliding seat, thereby avoiding the situation in traditional technology where the camera assembly used for safety inspections is sucked toward the center of the tunnel by the suction force generated by the running vehicle, thereby extending the service life of the inspection equipment.

[0007] Furthermore, the camera assembly includes a chassis rotatably mounted on the top of a mounting seat, a mounting column fixed on the top of the chassis, and a camera fixed on the top of the mounting column. The camera is communicatively connected to a device terminal controlled by surrounding on-duty personnel, and a rotating assembly for driving the chassis to rotate is jointly installed on the chassis and the mounting seat.

[0008] By adopting the above technical solution, the camera can communicate with the equipment terminal controlled by the surrounding on-duty personnel through wireless communication methods such as Bluetooth and data cards. In order to enhance the signal transmission strength, signal enhancers can be installed at intervals in the tunnel. This part belongs to the existing technology and there is no need to elaborate on it here.

[0009] Furthermore, the rotating assembly includes an upper motor fixed to the top of the chassis, an upper driving gear fixed to the output end of the upper motor, and an annular rack fixed to the top of the mounting base near the edge of the chassis, and the annular rack is meshed with the upper driving gear.

[0010] By adopting the above technical solution, the upper motor drives the upper active gear to rotate after working. Since the upper active gear is engaged with the annular rack fixed on the top of the mounting base, the upper motor is fixed on the top of the chassis, so that the camera assembly rotates, thereby expanding the inspection range of the camera.

[0011] Furthermore, the sliding seat includes a first outer L-shaped plate, a first inner L-shaped plate fixed to the inner side of the first outer L-shaped plate, a second inner L-shaped plate fixed to the outer side of the second inner L-shaped plate, and a second outer L-shaped plate fixed to the outer side of the second inner L-shaped plate, the first outer L-shaped plate and the first inner L-shaped plate are jointly mounted with a first ball that slidably cooperates with the guide rail, the center of the first ball is located on the intersection surface between the first outer L-shaped plate and the first inner L-shaped plate, the second inner L-shaped plate and the second outer L-shaped plate are jointly mounted with a second ball that slidably cooperates with the guide rail, the center of the second ball is located on the intersection surface between the second outer L-shaped plate and the second inner L-shaped plate, and the second outer L-shaped plate and the guide rail are jointly mounted with a driving component for driving the sliding seat to slide along the guide rail.

[0012] Furthermore, a receiving groove is provided at the bottom of the second outer L-shaped plate body, a through hole is penetrated at a position of the second outer L-shaped plate body close to the receiving groove, a mounting groove is opened at a position of the bottom of the guide rail corresponding to the through hole, and the length direction of the mounting groove is parallel to the length direction of the guide rail, and the driving assembly includes a spur rack fixed in the mounting groove, a lower motor fixed in the receiving groove, and a lower driving gear fixed at the output end of the lower motor and meshing with the spur rack.

[0013] By adopting the above technical solution, the lower motor drives the lower driving gear to rotate after working. Since the lower driving gear is meshed with the spur rack, and the spur rack is fixed in the installation groove, the sliding seat moves along the length direction of the guide rail, so that the camera can inspect the situation in the tunnel. The first ball bearings on the first outer L-shaped plate and the first inner L-shaped plate slide with the guide rail, and the second ball bearings on the second inner L-shaped plate and the second outer L-shaped plate also slide with the guide rail, so that the sliding seat slides with the guide rail, reducing the friction force during the sliding process of the sliding seat along the guide rail.

[0014] Furthermore, a reinforcement component for enhancing the stability of the guide rail is provided on the guide rail, and the reinforcement component includes a movable seat which is sleeved on the guide rail and movably connected, and the movable seat is provided with two and symmetrically distributed about the sliding seat. The reinforcement component also includes a C-shaped connecting rod fixed to both movable seats, a mounting rod fixed to the bottom of the C-shaped connecting rod, and a universal wheel movably mounted on the bottom of the mounting rod.

[0015] Furthermore, the movable seat includes an annular plate body sleeved on the guide rail, a mounting plate fixed to the outside of the annular plate body, and a third ball jointly mounted on the mounting plate and the annular plate body, the center of the third ball being located on the intersection surface between the annular plate body and the mounting plate, and the third ball rollingly engages with the surface of the guide rail.

[0016] By adopting the above technical scheme, the third ball bearings on the annular plate body and the mounting plate are both in rolling cooperation with the guide rail. When the sliding seat is driven forward by the lower motor, when the sliding seat pushes the movable seat to move forward along the length direction of the guide rail, the universal wheel at the bottom of the mounting rod moves along the bottom of the tunnel below the guide rail. The movable seat, C-shaped connecting rod, mounting rod and universal wheel cooperate to always support the guide rail around the sliding seat and the camera assembly, avoiding the bending of the middle section of the guide rail due to the long distance between the fixed points at both ends of the guide rail, enhancing the stability of the sliding seat and the camera assembly during movement, which is beneficial to improving the shooting quality of the camera, thereby improving the coefficient of tunnel safety inspection.

[0017] Furthermore, the mounting rods and universal wheels are provided in at least two groups.

[0018] The present application also discloses an automatic inspection method of a tunnel automatic inspection system, comprising the following steps:

[0019] S1. Start the lower motor and the camera. After the lower motor starts working, it drives the lower driving gear to rotate. Since the lower driving gear is meshed with the spur rack, the spur rack is fixed in the installation groove, so that the sliding seat moves along the length direction of the guide rail, so that the camera can inspect the situation in the tunnel;

[0020] S2, start the upper motor to drive the upper driving gear to rotate. Since the upper motor is fixed to the top of the chassis, the chassis is rotatably connected to the top of the mounting seat, and the annular rack fixed to the top of the mounting seat is meshed with the upper driving gear, so that the camera assembly rotates, expanding the inspection range of the camera;

[0021] S3. When the sliding seat slides forward until it abuts against one side of one of the movable seats, as the lower motor continues to work, the sliding seat pushes the movable seat forward along the length direction of the guide rail. Since a C-shaped connecting rod is fixed between the two movable seats, a mounting rod and a universal wheel are fixed at the bottom of the C-shaped connecting rod, thereby enhancing the stability of the longer guide rail, avoiding the bending of the middle section of the guide rail due to the long distance between the fixed points at both ends of the guide rail, and enhancing the stability of the sliding seat and the camera assembly during movement, which is beneficial to improving the image quality of the camera and thereby improving the coefficient of tunnel safety inspection.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. In the present application, the sliding seat, the mounting seat and the camera assembly are all located on the guide rail, and the guide rail has a certain limiting effect on the movement of the sliding seat, thereby avoiding the situation in the traditional technology that the camera assembly used for safety inspection is sucked to the center of the tunnel by the suction force generated by the vehicle, thereby extending the service life of the inspection equipment;

[0024] 2. In this application, the upper motor drives the upper driving gear to rotate after working. Since the upper driving gear is engaged with the annular rack fixed on the top of the mounting seat, the upper motor is fixed on the top of the chassis, so that the camera assembly rotates, expanding the inspection range of the camera;

[0025] 3. In the present application, the annular plate body and the third ball bearings on the mounting plate are in rolling cooperation with the guide rail. When the sliding seat is driven forward by the lower motor, when the sliding seat pushes the movable seat forward along the length direction of the guide rail, the universal wheel at the bottom of the mounting rod moves along the bottom of the tunnel below the guide rail. The movable seat, C-shaped connecting rod, mounting rod and universal wheel cooperate to always support the guide rail around the sliding seat and the camera assembly, avoiding the bending of the middle section of the guide rail due to the long distance between the fixed points at both ends of the guide rail, enhancing the stability of the sliding seat and the camera assembly during movement, which is beneficial to improving the image quality of the camera and thereby improving the coefficient of tunnel safety inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0028] Figure 3 yes Figure 1 A schematic diagram of the structure from another perspective;

[0029] Figure 4 is a schematic diagram of the structure of an embodiment of the present invention for highlighting a reinforcement component;

[0030] Figure 5 yes Figure 4 Schematic diagram of the structure from another perspective.

[0031] In the figure: 1. guide rail; 11. mounting groove; 2. sliding seat; 21. first outer L-shaped plate; 22. first inner L-shaped plate; 23. second inner L-shaped plate; 24. second outer L-shaped plate; 241. accommodating groove; 242. through hole; 25. first ball; 26. second ball; 3. mounting seat; 4. camera assembly; 41. chassis; 42. mounting column; 43. camera; 5. rotating assembly; 51. upper motor; 52. upper driving gear; 53. circular ring rack; 6. driving assembly; 61. spur rack; 62. lower motor; 63. lower driving gear; 7. reinforcement assembly; 71. movable seat; 711. annular plate; 712. mounting plate; 713. third ball; 72. C-shaped connecting rod; 73. mounting rod; 74. universal wheel. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0033] like Figure 1-5 As shown, an embodiment of the present application discloses an automatic tunnel inspection system, including a guide rail 1 fixed to the edge of a tunnel along the length direction of the tunnel, a sliding seat 2 slidably matched with the guide rail 1 is provided on the guide rail 1, a mounting seat 3 is fixed on the sliding seat 2, and a camera component 4 is provided on the mounting seat 3 for conducting safety inspections in the tunnel and transmitting the inspection information to a device terminal controlled by surrounding on-duty personnel.

[0034] The sliding seat 2, the mounting seat 3 and the camera assembly 4 are all located on the guide rail 1. The guide rail 1 limits the movement of the sliding seat 2 to a certain extent, thereby avoiding the situation in traditional technology where the camera assembly 4 used for safety inspections is sucked toward the center of the tunnel by the suction force generated by the driving of the vehicle, thereby extending the service life of the inspection equipment.

[0035] The camera assembly 4 includes a chassis 41 rotatably mounted on the top of the mounting seat 3, a mounting column 42 fixed on the top of the chassis 41, and a camera 43 fixed on the top of the mounting column 42. The camera 43 is communicatively connected to a device terminal controlled by surrounding on-duty personnel. A rotating assembly 5 for driving the chassis 41 to rotate is commonly installed on the chassis 41 and the mounting seat 3.

[0036] The camera 43 can be connected to the equipment terminal controlled by the surrounding on-duty personnel through wireless communication methods such as Bluetooth and data cards. In order to enhance the signal transmission strength, signal enhancers can be installed at intervals in the tunnel. This part belongs to the existing technology and there is no need to elaborate on it here.

[0037] The rotating assembly 5 includes an upper motor 51 fixed to the top of the chassis 41, an upper driving gear 52 fixed to the output end of the upper motor 51, and a ring-shaped rack 53 fixed to the top of the mounting seat 3 near the edge of the chassis 41, and the ring-shaped rack 53 is meshed with the upper driving gear 52. After the upper motor 51 is working, it drives the upper driving gear 52 to rotate. Since the upper driving gear 52 is meshed with the ring-shaped rack 53 fixed to the top of the mounting seat 3, the upper motor 51 is fixed to the top of the chassis 41, so that the camera assembly 4 rotates, expanding the inspection range of the camera 43.

[0038] The sliding seat 2 includes a first outer L-shaped plate 21, a first inner L-shaped plate 22 fixed to the inner side of the first outer L-shaped plate 21, a second inner L-shaped plate 23 fixed to the first inner L-shaped plate 22, and a second outer L-shaped plate 24 fixed to the outer side of the second inner L-shaped plate 23. The first outer L-shaped plate 21 and the first inner L-shaped plate 22 are jointly mounted with a first ball 25 that slidably cooperates with the guide rail 1, and the center of the first ball 25 is located on the intersection surface between the first outer L-shaped plate 21 and the first inner L-shaped plate 22. The second inner L-shaped plate 23 and the second outer L-shaped plate 24 are jointly mounted with a second ball 26 that slidably cooperates with the guide rail 1, and the center of the second ball 26 is located on the intersection surface between the second outer L-shaped plate 24 and the second inner L-shaped plate 23. The second outer L-shaped plate 24 and the guide rail 1 are jointly mounted with a driving component 6 for driving the sliding seat 2 to slide along the guide rail 1.

[0039] A receiving groove 241 is provided at the bottom of the second outer L-shaped plate body 24, and a through hole 242 is penetrated at a position of the second outer L-shaped plate body 24 close to the receiving groove 241. A mounting groove 11 is opened at a position of the bottom of the guide rail 1 corresponding to the through hole 242, and the length direction of the mounting groove 11 is parallel to the length direction of the guide rail 1. The driving component 6 includes a spur rack 61 fixed in the mounting groove 11, a lower motor 62 fixed in the receiving groove 241, and a lower driving gear 63 fixed at the output end of the lower motor 62 and meshing with the spur rack 61.

[0040] After the lower motor 62 starts working, it drives the lower driving gear 63 to rotate. Since the lower driving gear 63 is meshed with the spur rack 61, the spur rack 61 is fixed in the mounting groove 11, so that the sliding seat 2 moves along the length direction of the guide rail 1, so that the camera 43 can inspect the situation in the tunnel. The first ball 25 on the first outer L-shaped plate 21 and the first inner L-shaped plate 22 slides with the guide rail 1, and the second ball 26 on the second inner L-shaped plate 23 and the second outer L-shaped plate 24 also slides with the guide rail 1, so that the sliding seat 2 slides with the guide rail 1, reducing the friction force of the sliding seat 2 during the sliding process along the guide rail 1.

[0041] The guide rail 1 is provided with a reinforcement assembly 7 for enhancing the stability of the guide rail 1. The reinforcement assembly 7 includes a movable seat 71 sleeved on the guide rail 1 and movably connected. The movable seat 71 is provided with two and symmetrically distributed about the sliding seat 2. The reinforcement assembly 7 also includes a C-shaped connecting rod 72 fixed to both movable seats 71, a mounting rod 73 fixed to the bottom of the C-shaped connecting rod 72, and a universal wheel 74 movably mounted to the bottom of the mounting rod 73. The movable seat 71 includes an annular plate body 711 sleeved on the guide rail 1, a mounting plate 712 fixed to the outside of the annular plate body 711, and a third ball 713 mounted on the mounting plate 712 and the annular plate body 711. The ball center of the third ball 713 is located on the intersection surface between the annular plate body 711 and the mounting plate 712. The third ball 713 rolls with the surface of the guide rail 1.

[0042] The third ball bearings 713 on the annular plate body 711 and the mounting plate 712 are in rolling cooperation with the guide rail 1. When the sliding seat 2 is driven forward by the lower motor 62, when the sliding seat 2 pushes the movable seat 71 to move forward along the length direction of the guide rail 1, the universal wheel 74 at the bottom of the mounting rod 73 moves along the bottom of the tunnel below the guide rail 1. The movable seat 71, the C-shaped connecting rod 72, the mounting rod 73, and the universal wheel 74 cooperate to always support the guide rail 1 around the sliding seat 2 and the camera assembly 4, avoiding the bending of the middle section of the guide rail 1 due to the long distance between the fixed points at both ends of the guide rail 1, enhancing the stability of the sliding seat 2 and the camera assembly 4 during movement, which is beneficial to improving the shooting quality of the camera 43, thereby improving the coefficient of tunnel safety inspection.

[0043] In order to further enhance the stability of the sliding seat 2 and the camera assembly 4 during movement, at least two sets of mounting rods 73 and universal wheels 74 are provided.

[0044] The operating principle of an automatic tunnel inspection system in this embodiment is as follows: the sliding seat 2, the mounting seat 3 and the camera assembly 4 are all located on the guide rail 1. The guide rail 1 has a certain limiting effect on the movement of the sliding seat 2, thereby avoiding the situation in traditional technology where the camera assembly 4 used for safety inspections is sucked toward the center of the tunnel by the suction force generated by the driving of the vehicle, thereby extending the service life of the inspection equipment.

[0045] This embodiment also discloses an automatic inspection method for an automatic tunnel inspection system, comprising the following steps:.

[0046] S1, start the lower motor 62 and the camera 43. After the lower motor 62 starts working, it drives the lower driving gear 63 to rotate. Since the lower driving gear 63 is meshed with the spur rack 61, the spur rack 61 is fixed in the mounting groove 11, so that the sliding seat 2 moves along the length direction of the guide rail 1, so that the camera 43 can inspect the situation in the tunnel;

[0047] S2, start the upper motor 51 to drive the upper driving gear 52 to rotate. Since the upper motor 51 is fixed to the top of the chassis 41, the chassis 41 is rotatably connected to the top of the mounting seat 3, and the annular rack 53 fixed to the top of the mounting seat 3 is meshed with the upper driving gear 52, so that the camera assembly 4 rotates, expanding the inspection range of the camera 43;

[0048] S3. When the sliding seat 2 slides forward until it abuts against one side of one of the movable seats 71, as the lower motor 62 continues to work, the sliding seat 2 pushes the movable seat 71 forward along the length direction of the guide rail 1. Since a C-shaped connecting rod 72 is fixed between the two movable seats 71, a mounting rod 73 and a universal wheel 74 are fixed to the bottom of the C-shaped connecting rod 72. This enhances the stability of the longer guide rail 1, avoids the bending of the middle section of the guide rail 1 due to the long distance between the fixed points at both ends of the guide rail 1, enhances the stability of the sliding seat 2 and the camera assembly 4 during movement, is beneficial to improve the image quality of the camera 43, and thereby improves the coefficient of tunnel safety inspection.

[0049] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An automatic tunnel inspection system, characterized by: The invention comprises a guide rail (1) fixed to the edge of a tunnel along the length direction of the tunnel, a sliding seat (2) slidably matched with the guide rail (1) being arranged on the guide rail (1), a mounting seat (3) being fixed on the sliding seat (2), and a camera assembly (4) on a device terminal for conducting safety inspections in the tunnel and transmitting inspection information to surrounding on-duty personnel for control.

2. The automatic tunnel inspection system according to claim 1 is characterized in that: The camera assembly (4) comprises a chassis (41) rotatably mounted on the top of a mounting seat (3), a mounting post (42) fixed on the top of the chassis (41), and a camera (43) fixed on the top of the mounting post (42); the camera (43) is communicatively connected to a device terminal controlled by surrounding on-duty personnel; a rotating assembly (5) for driving the chassis (41) to rotate is installed on both the chassis (41) and the mounting seat (3).

3. The automatic tunnel inspection system according to claim 2 is characterized in that: The rotating assembly (5) comprises an upper motor (51) fixed to the top of the chassis (41), an upper driving gear (52) fixed to the output end of the upper motor (51), and an annular rack (53) fixed to the top of the mounting seat (3) near the edge of the chassis (41), wherein the annular rack (53) meshes with the upper driving gear (52).

4. The automatic tunnel inspection system according to claim 2 is characterized in that: The sliding seat (2) comprises a first outer L-shaped plate (21), a first inner L-shaped plate (22) fixed to the inner side of the first outer L-shaped plate (21), a second inner L-shaped plate (23) fixed to the first inner L-shaped plate (22), and a second outer L-shaped plate (24) fixed to the outer side of the second inner L-shaped plate (23), wherein the first outer L-shaped plate (21) and the first inner L-shaped plate (22) are both provided with a first ball (25) which is slidably matched with the guide rail (1), and the center of the first ball (25) is located at the first outer L-shaped plate (21). A second ball (26) that slidably cooperates with the guide rail (1) is installed on the intersection surface between the L-shaped plate (21) and the first inner L-shaped plate (22), and the second inner L-shaped plate (23) and the second outer L-shaped plate (24) are installed together. The center of the second ball (26) is located on the intersection surface between the second outer L-shaped plate (24) and the second inner L-shaped plate (23). A driving component (6) for driving the sliding seat (2) to slide along the guide rail (1) is installed together on the second outer L-shaped plate (24) and the guide rail (1).

5. The automatic tunnel inspection system according to claim 4 is characterized in that: The bottom of the second outer L-shaped plate (24) is provided with a receiving groove (241); a through hole (242) is penetrated through the second outer L-shaped plate (24) at a position close to the receiving groove (241); a mounting groove (11) is provided at a position corresponding to the through hole (242) at the bottom of the guide rail (1); the length direction of the mounting groove (11) is parallel to the length direction of the guide rail (1); the driving assembly (6) comprises a spur rack (61) fixed in the mounting groove (11), a lower motor (62) fixed in the receiving groove (241), and a lower driving gear (63) fixed at the output end of the lower motor (62) and meshing with the spur rack (61).

6. The automatic tunnel inspection system according to claim 5 is characterized in that: The guide rail (1) is provided with a reinforcement component (7) for enhancing the stability of the guide rail (1), the reinforcement component (7) comprising a movable seat (71) sleeved on the guide rail (1) and movably connected, the movable seat (71) being provided with two and symmetrically distributed about the sliding seat (2), the reinforcement component (7) further comprising a C-shaped connecting rod (72) fixed to both movable seats (71), a mounting rod (73) fixed to the bottom of the C-shaped connecting rod (72), and a universal wheel (74) movably mounted to the bottom of the mounting rod (73).

7. The automatic tunnel inspection system according to claim 6 is characterized in that: The movable seat (71) comprises an annular plate body (711) sleeved on the guide rail (1), a mounting plate (712) fixed to the outside of the annular plate body (711), and a third ball (713) mounted on the mounting plate (712) and the annular plate body (711), wherein the center of the third ball (713) is located on the intersection surface between the annular plate body (711) and the mounting plate (712), and the third ball (713) is in rolling engagement with the surface of the guide rail (1).

8. The automatic tunnel inspection system according to claim 6 is characterized in that: The installation rods (73) and universal wheels (74) are each provided with at least two sets.

9. An automatic inspection method for a tunnel automatic inspection system according to any one of claims 1 to 8, characterized in that: The steps include: S1, start the lower motor (62) and the camera (43), and after the lower motor (62) starts working, it drives the lower driving gear (63) to rotate. Since the lower driving gear (63) is meshed with the spur rack (61), the spur rack (61) is fixed in the mounting groove (11), so that the sliding seat (2) moves along the length direction of the guide rail (1), so that the camera (43) can inspect the situation in the tunnel; S2, starting the upper motor (51) to drive the upper driving gear (52) to rotate. Since the upper motor (51) is fixed to the top of the chassis (41), the chassis (41) is rotatably connected to the top of the mounting seat (3), and the annular rack (53) fixed to the top of the mounting seat (3) is meshed with the upper driving gear (52), so that the camera assembly (4) rotates, thereby expanding the inspection range of the camera (43); S3. When the sliding seat (2) slides forward to abut against one side of one of the movable seats (71), as the lower motor (62) continues to work, the sliding seat (2) pushes the movable seat (71) to move forward along the length direction of the guide rail (1). Since a C-shaped connecting rod (72) is fixed between the two movable seats (71), a mounting rod (73) and a universal wheel (74) are fixed at the bottom of the C-shaped connecting rod (72), thereby enhancing the stability of the relatively long guide rail (1), avoiding the bending of the middle section of the guide rail (1) due to the long distance between the fixed points at both ends of the guide rail (1), enhancing the stability of the sliding seat (2) and the camera assembly (4) during the movement, and facilitating the improvement of the image quality of the camera (43), thereby improving the coefficient of tunnel safety inspection.

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