A concrete crack inspection device

Abstract

The application discloses a concrete crack patrol device and belongs to the technical field of concrete crack detection. The device comprises a body assembly, a measuring assembly and a compensation assembly. The body assembly comprises a remote control trolley. The measuring assembly comprises a laser beam emitter and a photoelectric sensor arranged at the bottom of the remote control trolley. The laser beam emitter emits laser beams to the concrete crack, and the photoelectric sensor is used for receiving the reflected laser beams. The compensation assembly comprises a slide rail and a reflection member arranged at the bottom of the remote control trolley. The photoelectric sensor is adapted to slide along the length direction of the slide rail, and the reflection member is rotationally connected to the bottom of the remote control trolley. The compensation assembly is used for compensating the laser beams, thereby reducing the influence of insufficient light. The second gear is arranged to slide, so that the first gear is prevented from directly engaging with the second gear when moving, and tooth breakage is avoided.

Description

Technical Field

[0001] This invention relates to the field of concrete crack detection technology, and in particular to a concrete crack inspection device. Background Technology

[0002] The photoelectric sensor in the concrete crack inspection device is highly sensitive to light; in insufficient light, its measurements may be interfered with. During measurement, a reflector is used to enhance laser reflection, allowing for better capture of the reflected signal even in poor lighting conditions. The reflector is typically positioned perpendicular to the target surface. Due to the reflector's reflection, the laser does not return to the original position of the photoelectric sensor; therefore, the sensor needs to be moved to a suitable location to receive the reflected laser. The reflector needs to be designed with two states: a horizontal storage state and a vertical operating state. A gear and rack mechanism drives the slider and photoelectric sensor to move. An additional gear is mounted on the reflector, which rotates the reflector. If the first gear directly meshes with the second gear during movement, there is a risk of tooth breakage. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems of the above and / or existing concrete crack inspection devices, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to solve the problem of tooth breakage caused by the first gear directly meshing with the second gear during axial movement.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a concrete crack inspection device, comprising: a main body assembly including a remote-controlled trolley; a measuring assembly including a laser beam emitter and a photoelectric sensor disposed at the bottom of the remote-controlled trolley, wherein the laser beam emitter emits laser light toward the concrete crack, and the photoelectric sensor is used to receive the laser light reflected by the concrete crack; and a compensation assembly including a slide rail and a reflector disposed at the bottom of the remote-controlled trolley, wherein the photoelectric sensor is adapted to slide along the length direction of the slide rail, and the reflector is rotatably connected to the bottom of the remote-controlled trolley.

[0007] In a preferred embodiment of the concrete crack inspection device of the present invention, the length direction of the slide rail is parallel to the travel direction of the remote control trolley, the compensation component further includes a slider, the slider is slidably connected to the slide rail, and the photoelectric sensor is disposed on the slider.

[0008] In a preferred embodiment of the concrete crack inspection device of the present invention, the compensation component further includes a rack and a first cylinder. The rack is disposed at the bottom of the remote-controlled trolley, and the first cylinder is disposed on the remote-controlled trolley. The length direction of the rack is parallel to the length direction of the slide rail, and the first cylinder drives the rack to move up and down. The slider is provided with a mounting shaft, and a first gear is rotatably mounted on the mounting shaft. The first gear meshes with the rack. The slider is provided with a motor, and the motor drives the first gear to rotate. The first cylinder is adapted to drive the rack to disengage from the first gear.

[0009] As a preferred embodiment of the concrete crack inspection device of the present invention, the reflector includes a mounting block disposed at the bottom of the remote control trolley, a mounting column rotatably mounted on the mounting block, and a reflective sheet disposed on the mounting column; the mounting column is provided with a first rotating shaft, and a second gear is slidably mounted on the first rotating shaft, the second gear being adapted to move along the axial direction of the first rotating shaft, and the second gear being adapted to mesh with the first gear.

[0010] As a preferred embodiment of the concrete crack inspection device of the present invention, the mounting block is provided with a mating hole, the mounting column is provided with a mounting hole inside, the axial direction of the mounting hole is perpendicular to the length direction of the slide rail, the mounting column is provided with a second rotating shaft, the second rotating shaft is coaxially arranged with the first rotating shaft, the second rotating shaft is rotatably connected to the mating hole, both the first rotating shaft and the second rotating shaft are hollow inside, and the inner cavity of the first rotating shaft is connected to the inner cavity of the second rotating shaft; a communicating clearance groove is provided on the circumferential wall of the second rotating shaft.

[0011] As a preferred embodiment of the concrete crack inspection device of the present invention, the installation block is provided with a second installation groove, the second installation groove is vertically arranged, a second transmission column is elastically installed in the second installation groove, a second cylinder is provided on the installation block, the output end of the second cylinder is connected to the second transmission column, and the second cylinder is used to drive the second transmission column through the communicating clearance groove and into the inner cavity of the second rotating shaft.

[0012] In a preferred embodiment of the concrete crack inspection device of the present invention, a third transmission column is slidably installed in the inner cavity of the second rotating shaft. The circumferential wall of the third transmission column is adapted to abut against the second transmission column. The second transmission column is used to drive the third transmission column to extend into the inner cavity of the first rotating shaft. A third mounting groove is provided on the outer circumferential wall of the first rotating shaft. The third mounting groove is connected to the inner cavity of the first rotating shaft. A protrusion is provided on the inner circumferential wall of the second gear. The protrusion is slidably connected to the third mounting groove and extends into the inner cavity of the first rotating shaft. The protrusion is elastically connected to the first rotating shaft.

[0013] In a preferred embodiment of the concrete crack inspection device of the present invention, the third transmission column is stationary relative to the second rotating shaft in the circumferential direction.

[0014] In a preferred embodiment of the concrete crack inspection device of the present invention, the second gear includes a toothed portion, the circumferential length of which is one-quarter of the circumferential length of the second gear; a vertically arranged cylinder is provided on the mounting shaft, the top surface of which is recessed downward to form a circular hole, a reset column is elastically installed in the circular hole, a reset cam portion is provided on the circumferential wall of the first rotating shaft, and the reset column is adapted to abut against the reset cam portion; an air nozzle is provided on the mounting shaft, and the air nozzle is connected to the circular hole pipe.

[0015] As a preferred embodiment of the concrete crack inspection device of the present invention, the third transmission column has a ratchet portion on the end face away from the slide rail, and a ratchet block is elastically installed in the mating hole of the mounting block, and the ratchet portion is adapted to engage with the ratchet block.

[0016] The beneficial effects of this invention are as follows: the laser is compensated by the compensation component, reducing the impact of insufficient light; the second gear is set to be sliding, avoiding direct meshing between the first gear and the second gear when moving, thus preventing tooth breakage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 This is a diagram illustrating the use of a concrete crack inspection device.

[0019] Figure 2 This is a structural diagram of a concrete crack inspection device.

[0020] Figure 3 This is a partial structural diagram of a concrete crack inspection device.

[0021] Figure 4 This is a diagram showing the first state of the second slider of the concrete crack inspection device.

[0022] Figure 5 This is a second state diagram of the second slider of the concrete crack inspection device.

[0023] Figure 6 This is the third state diagram of the second slider of the concrete crack inspection device.

[0024] Figure 7 This is the fourth state diagram of the second slider of the concrete crack inspection device.

[0025] Figure 8 This is a diagram showing the assembly relationships of the various components of a concrete crack inspection device. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0029] Example 1

[0030] See Figures 1 to 8 This is the first embodiment of the present invention. This embodiment provides a concrete crack inspection device, including: a body component 100, a measuring component 200 and a compensation component 300. The body component 100 is used to install the measuring component 200 and the compensation component 300. The measuring component 200 is used to measure the width of cracks on the concrete surface, and the compensation component 300 is used to reduce the influence of insufficient light on the measurement accuracy of the measuring component 200.

[0031] Specifically, the main body component 100 includes a remote-controlled vehicle 101; when in use, the remote-controlled vehicle 101 can move on the ground that needs to be inspected.

[0032] Preferably, the measuring component 200 includes a laser beam emitter 201 and a photoelectric sensor 202. Both the laser beam emitter 201 and the photoelectric sensor 202 are disposed at the bottom of the remote-controlled vehicle 101. The laser beam emitter 201 emits laser light into the concrete cracks, and the photoelectric sensor 202 is used to receive the laser light reflected by the concrete cracks.

[0033] Furthermore, the compensation component 300 includes a slide rail 301 and a reflector 302. Both the slide rail 301 and the reflector 302 are disposed at the bottom of the remote control vehicle 101. The photoelectric sensor 202 is adapted to slide along the length direction of the slide rail 301. The reflector 302 is rotatably connected to the bottom of the remote control vehicle 101, and the reflector 302 is drive-connected to the photoelectric sensor 202. When the light is insufficient, the photoelectric sensor 202 moves along the length direction of the slide rail 301. During the movement of the photoelectric sensor 202, the reflector 302 gradually rotates until the reflector 302 rotates to a state perpendicular to the ground. Subsequently, the photoelectric sensor 202 needs to continue to move to the position of receiving the signal.

[0034] Example 2

[0035] Reference Figures 1 to 8 This is the second embodiment of the present invention, which is based on embodiment 1.

[0036] Specifically, the length direction of the slide rail 301 is parallel to the travel direction of the remote control car 101. The compensation component 300 also includes a slider 303, which is slidably connected to the slide rail 301. The photoelectric sensor 202 is mounted on the slider 303. In use, the slider 303 drives the photoelectric sensor 202 to move along the length direction of the slide rail 301 to adjust the position of the photoelectric sensor 202.

[0037] Preferably, the compensation component 300 further includes a rack 304 and a first cylinder 305. The rack 304 is disposed at the bottom of the remote control car 101, and the first cylinder 305 is disposed on the remote control car 101. The length direction of the rack 304 is parallel to the length direction of the slide rail 301. The first cylinder 305 drives the rack 304 to rise and fall. The slider 303 is provided with a mounting shaft 303a, and a first gear 303b is rotatably mounted on the mounting shaft 303a. The first gear 303b meshes with the rack 304. The slider 303 is provided with a motor, and the motor drives the first gear 303b to rotate. The first cylinder 305 is adapted to drive the rack 304 to disengage from the first gear 303b. In use, the first cylinder 305 controls the descent of the rack 304, causing the rack 304 to disengage from the first gear 303b, thereby enabling the first gear 303b to exist in a state where it can rotate without moving along the length direction of the rack 304.

[0038] Preferably, the reflector 302 includes a mounting block 302a, a mounting post 302b, and a reflector 302c. The mounting block 302a is disposed at the bottom of the remote control vehicle 101 and is vertically arranged. The mounting post 302b is rotatably mounted on the mounting block 302a, and the reflector 302c is disposed on the mounting post 302b. A first rotating shaft 302d is provided at the right end of the mounting post 302b, and a second gear 302e is slidably mounted on the first rotating shaft 302d. The second gear 302e is adapted to move along the first rotating shaft 302a. The second gear 302e moves along the axial direction of the first rotating shaft 302d and is adapted to mesh with the first gear 303b. In use, when the slider 303 moves to a state where the projection of the axis of the first gear 303b on the horizontal plane coincides with the projection of the second gear 302e on the horizontal plane, the first cylinder 305 drives the rack 304 to rise and fall. Then the second gear 302e moves along the axial direction of the first rotating shaft 302d toward the direction closer to the first gear 303b, and then the second gear 302e meshes with the first gear 303b.

[0039] It is worth noting that: considering that the first gear 303b moves along the length of the slide rail 301, if the first gear 303b directly and roughly meshes with the second gear 302e during the movement, there is a possibility of tooth breakage, affecting the performance and lifespan of the mechanical system. Therefore, the second gear 302e is designed to slide. In use, the second gear 302e has two states: the first state is when the first gear 303b and the second gear 302e are disengaged, and the second state is when the second gear 302e is engaged with the first gear 303b. When the first gear 303b moves to the bottom of the second gear 302e, the first gear 303b stops axial movement, and the second gear 302e slides and meshes with the first gear 303b, thus avoiding rough meshing between the first gear 303b and the second gear 302e during the movement.

[0040] Preferably, the mounting block 302a is provided with a mating hole 302f, and the mounting post 302b is provided with a mounting hole 302g inside. The axial direction of the mounting hole 302g is perpendicular to the length direction of the slide rail 301. The left end of the mounting post 302b is provided with a second rotating shaft 302h. The second rotating shaft 302h, the first rotating shaft 302d, and the mounting hole 302g are coaxially arranged. The second rotating shaft 302h and the first rotating shaft 302d are located on the left and right sides of the mounting post 302b, respectively. The second rotating shaft 302h is inserted into the mating hole 302f and is rotatably connected to the mating hole 302f. The interiors of the first rotating shaft 302d and the second rotating shaft 302h are both hollow, and the inner cavity of the first rotating shaft 302d is connected to the inner cavity of the second rotating shaft 302h through the mounting hole 302g. A communicating clearance groove 302i is provided on the circumferential wall of the second rotating shaft 302h.

[0041] Preferably, the mounting block 302a has a second mounting groove 302j, which is vertically arranged. A second transmission column 302k is elastically mounted in the second mounting groove 302j. The mounting block 302a has a second cylinder (not shown in the figure), and the output end of the second cylinder is connected to the second transmission column 302k. The second cylinder is used to drive the second transmission column 302k to move vertically along the length direction of the second mounting groove 302j. The second cylinder is also used to drive the second transmission column 302k to pass through the communicating clearance groove 302i and extend into the inner cavity of the second rotating shaft 302h. In use, when it is necessary to move the second gear 302e along the axial direction of the first rotating shaft 302d towards the first gear 303b, the second cylinder drives the second transmission column 302k to pass through the communicating clearance groove 302i until the second transmission column 302k extends into the inner cavity of the second rotating shaft 302h.

[0042] Preferably, a third transmission column 302m is slidably installed inside the cavity of the second rotating shaft 302h. The circumferential wall of the third transmission column 302m is adapted to abut against the second transmission column 302k. In this embodiment, a wedge-shaped groove 302m-2 is provided on the circumferential wall of the third transmission column 302m. The wedge-shaped groove 302m-2 is arranged around the circumferential wall of the third transmission column 302m. The bottom end of the second transmission column 302k is adapted to abut against the wedge-shaped groove 302m-2 on the circumferential wall of the third transmission column 302m. Through the cooperation between the second transmission column 302k and the wedge-shaped groove 302m-2, when the second transmission column 302k moves downward, it can drive the third transmission column 302m to move to the right. That is, the second transmission column 302k is used to drive the third transmission column 302m to extend into the cavity of the first rotating shaft 302d.

[0043] A third mounting groove 302n is provided on the outer circumferential wall of the first rotating shaft 302d. There are four third mounting grooves 302n, which are evenly arranged around the circumference of the first rotating shaft 302d. The third mounting grooves 302n are connected to the inner cavity of the first rotating shaft 302d. A protrusion 302p is provided on the inner circumferential wall of the second gear 302e. The protrusion 302p is slidably connected to the third mounting groove 302n and extends into the inner cavity of the first rotating shaft 302d. The right end of the protrusion 302p is elastically connected to the first rotating shaft 302d by a spring. The protrusion 302p is used to restrict the second gear 302e to move only axially relative to the first rotating shaft 302d and be circumferentially fixed, so that when the first gear 303b drives the second gear 302e to rotate, it can also drive the mounting post 302b to rotate.

[0044] Preferably, the third transmission column 302m is circumferentially stationary relative to the second rotating shaft 302h; a limiting groove is provided on the inner wall of the second rotating shaft 302h, the length direction of the limiting groove is parallel to the axial direction of the second rotating shaft 302h, and a limiting block is provided on the third transmission column 302m, the limiting block and the limiting groove are slidably engaged, so that the third transmission column 302m can move along the axial direction of the second rotating shaft 302h while remaining circumferentially stationary; in use, when the first gear 303b drives the second gear 302e to rotate, it drives the mounting column 302b to rotate, and the second rotating shaft 302h on the mounting column 302b drives the third transmission column 302m to rotate synchronously.

[0045] Preferably, the second gear 302e includes a toothed portion 302e-1, the circumferential length of which is one-quarter of the circumferential length of the second gear 302e. This ensures that when the first gear 303b meshes with the second gear 302e, the first gear 303b can only drive the second gear 302e to rotate 90 degrees, that is, the mounting post 302b only needs to rotate until it is perpendicular to the ground, thus avoiding excessive rotation of the mounting post 302b.

[0046] Preferably, the mounting shaft 303a has a vertically arranged cylinder 303d, the top surface of which is recessed downward to form a circular hole 303e. A reset post 303f is elastically installed inside the circular hole 303e. A reset cam part 302d-1 is provided on the circumferential wall of the first rotating shaft 302d. The reset post 303f is adapted to abut against the reset cam part 302d-1. The mounting shaft 303a has an air nozzle 303g, which is connected to the circular hole 303e via a pipe. In use, the air nozzle 303g is connected to an air source, and the air source fills or cuts off the air supply to the circular hole 303e through the pipe. When filled with air, the reset post 303f maintains a constant height in a vertical state. When the air supply is cut off, the reset post 303f loses its vertical restriction and will move downward when subjected to an external force.

[0047] Preferably, a ratchet portion 302m-1 is provided on the end face of the third transmission column 302m away from the slide rail 301, and a ratchet block 302q is elastically installed in the mating hole 302f of the mounting block 302a. The ratchet portion 302m-1 is adapted to engage with the ratchet block 302q. In the initial state, the ratchet portion 302m-1 and the ratchet block 302q of the third transmission column 302m are engaged, making the third transmission column 302m circumferentially stationary. In the adjusted state, the third transmission column 302m is squeezed by the second transmission column 302k, causing the ratchet portion 302m-1 to separate from the ratchet block 302q. At this time, the ratchet block 302q does not... It will prevent the third transmission column 302m and the second rotating shaft 302h from rotating 90°; in the reset state, although the ratchet part 302m-1 and the ratchet block 302q are engaged, since the ratchet block 302q is elastically installed, the ratchet block 302q will not prevent the third transmission column 302m from rotating 90° in the opposite direction; at this time, there is no need for the second gear 302e to slide and then cooperate with the first gear 303b. It can be directly charged by the air source, the reset column 303f abuts against the reset cam part 302d-1, and the third transmission column 302m rotates 90° in the opposite direction, thus making the speed faster.

[0048] In this embodiment, the remote-controlled vehicle 101 is placed on the surface of the dam. The remote-controlled vehicle 101 inspects along the length of the dam to check for cracks.

[0049] It is worth noting that: the bottom of the vehicle is equipped with a laser beam emitter 201 and a photoelectric sensor 202. Both the laser beam emitter 201 and the photoelectric sensor 202 are existing technologies and will not be described in detail here; the reflector 302c typically has high reflectivity, which can improve the accuracy of the measurement. The reflector 302c is also existing technology and will not be described in detail here; when the laser beam shines on the surface of the reflector 302c, due to the high reflectivity of the reflector 302c, most of the laser energy will be reflected back to the photoelectric sensor 202. In this way, even under poor lighting conditions, a sufficiently strong reflected signal can be obtained, thereby ensuring the accuracy and reliability of the measurement; the reflector 302c can significantly enhance the intensity of the laser reflected signal, improve the signal-to-noise ratio of the measurement, and make the measurement results more accurate and reliable; the reflector 302c can help reduce the interference of environmental factors on laser measurement, such as poor lighting conditions or the influence of background stray light.

[0050] It is important to note that the reflector 302c is typically installed near the target surface to be measured, rather than at the location of the photoelectric sensor 202. This is to enhance the reflected laser signal, thereby improving the accuracy and reliability of the measurement. When the laser beam illuminates a crack on the target surface, part of the laser beam is reflected onto the reflector 302c and then back to the photoelectric sensor 202 of the laser crack gauge. Therefore, to accommodate both normal and insufficient lighting conditions, the reflector 302c cannot be fixed but must be designed to be movable. When the lighting is normal, the reflector 302c needs to be retracted; it only needs to be lowered when the lighting is insufficient.

[0051] When the light is normal, it is only necessary to fix the laser beam emitter 201 and the photoelectric sensor 202 to the bottom of the car, and the propagation trajectory of the laser beam is fixed. However, it is now necessary to consider that the reflector 302c needs to be perpendicular to the ground. Therefore, the laser beam reflected by the reflector 302c will inevitably not reach the original position of the photoelectric sensor 202. The position of the photoelectric sensor 202 also needs to be adjusted to receive the laser beam reflected by the reflector 302c.

[0052] When the mounting post 302b can rotate to a position where its length direction is perpendicular to the ground, the slider 303 and the photoelectric sensor 202 have not yet slid to the appropriate position. The slider 303 still needs to continue sliding. When the slider 303 continues to slide, it will no longer drive the mounting post 302b to rotate.

[0053] To facilitate understanding of the technical solution of the concrete crack inspection device of the present invention, its working principle is briefly explained below:

[0054] Initial state: Mounting post 302b remains horizontal with the cooperation of ratchet part 302m-1 and ratchet block 302q;

[0055] Adjustment process: Slider 303 moves from right to left. When slider 303 drives the first gear 303b to move below the first rotating shaft 302d, the first cylinder 305 drives the rack 304 to move downwards. At this time, the rack 304 disengages from the first gear 303b. During the process of slider 303 driving the first gear 303b to move below the first rotating shaft 302d, the second cylinder does work, driving the second gear 302e to move axially to the right through the second transmission column 302k and the third transmission column 302m to mesh with the first gear 303b. At this time, the air source is not filled with air. Although the reset column 303f abuts against the reset cam 302d-1, it does not restrict the synchronous rotation of the mounting column 302b and the second rotating shaft 302h. Then, the first gear 303b drives the second gear 302e to rotate ninety degrees. Then, the second cylinder stops working, the second transmission column 302k moves upwards, and the second gear 302e resets to the initial state to the left under the action of the spring.

[0056] Reset process: The slider 303 moves from left to right. At this time, the air source is filled with air. The reset column 303f remains at a constant height in the vertical state. The reset column 303f abuts against the reset cam 302d-1, driving the second gear 302e to rotate 90° in the opposite direction, so that the mounting column 302b is reset to the initial horizontal state.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A concrete crack inspection device, characterized in that, include: The main body component (100) includes a remote-controlled car (101); The measuring component (200) includes a laser beam emitter (201) and a photoelectric sensor (202) disposed at the bottom of a remote-controlled vehicle (101), wherein the laser beam emitter (201) emits laser light toward concrete cracks and the photoelectric sensor (202) is used to receive laser light reflected from the concrete cracks; The compensation component (300) includes a slide rail (301) and a reflector (302) disposed at the bottom of the remote control vehicle (101), the photoelectric sensor (202) is adapted to slide along the length direction of the slide rail (301), and the reflector (302) is rotatably connected to the bottom of the remote control vehicle (101); The length direction of the slide rail (301) is parallel to the travel direction of the remote control car (101). The compensation component (300) also includes a slider (303), which is slidably connected to the slide rail (301). The photoelectric sensor (202) is disposed on the slider (303). The compensation component (300) further includes a rack (304) and a first cylinder (305). The rack (304) is disposed at the bottom of the remote control vehicle (101), and the first cylinder (305) is disposed on the remote control vehicle (101). The length direction of the rack (304) is parallel to the length direction of the slide rail (301). The first cylinder (305) drives the rack (304) to rise and fall. The slider (303) is provided with a mounting shaft (303a). A first gear (303b) is rotatably mounted on the mounting shaft (303a). The first gear (303b) meshes with the rack (304). The slider (303) is provided with a motor. The motor drives the first gear (303b) to rotate. The first cylinder (305) is adapted to drive the rack (304) to disengage from the first gear (303b). The reflector (302) includes a mounting block (302a) disposed at the bottom of the remote control vehicle (101), a mounting post (302b) rotatably mounted on the mounting block (302a), and a reflector sheet (302c) disposed on the mounting post (302b); the mounting post (302b) is provided with a first rotating shaft (302d), a second gear (302e) is slidably mounted on the first rotating shaft (302d), the second gear (302e) is adapted to move along the axial direction of the first rotating shaft (302d), and the second gear (302e) is adapted to mesh with the first gear (303b); The second gear (302e) includes a toothed portion (302e-1), the circumferential length of which is one-quarter of the circumferential length of the second gear (302e); a vertically arranged cylinder (303d) is provided on the mounting shaft (303a), the top surface of which is recessed downward to form a circular hole (303e), a reset pin (303f) is elastically installed in the circular hole (303e), a reset cam portion (302d-1) is provided on the circumferential wall of the first rotating shaft (302d), and the reset pin (303f) is adapted to abut against the reset cam portion (302d-1); an air nozzle (303g) is provided on the mounting shaft (303a), and the air nozzle (303g) is connected to the circular hole (303e) via a pipe.

2. The concrete crack inspection device as described in claim 1, characterized in that, The mounting block (302a) is provided with a mating hole (302f), and the mounting post (302b) is provided with a mounting hole (302g) inside. The axial direction of the mounting hole (302g) is perpendicular to the length direction of the slide rail (301). The mounting post (302b) is provided with a second rotating shaft (302h), which is coaxially arranged with the first rotating shaft (302d). The second rotating shaft (302h) is rotatably connected to the mating hole (302f). The interiors of the first rotating shaft (302d) and the second rotating shaft (302h) are both hollow, and the inner cavity of the first rotating shaft (302d) is connected to the inner cavity of the second rotating shaft (302h). A communicating clearance groove (302i) is provided on the circumferential wall of the second rotating shaft (302h).

3. The concrete crack inspection device as described in claim 2, characterized in that, The mounting block (302a) is provided with a second mounting groove (302j), which is vertically arranged. A second transmission column (302k) is elastically installed in the second mounting groove (302j). A second cylinder is provided on the mounting block (302a). The output end of the second cylinder is connected to the second transmission column (302k) for transmission. The second cylinder is used to drive the second transmission column (302k) through the communicating clearance groove (302i) and into the inner cavity of the second rotating shaft (302h).

4. The concrete crack inspection device as described in claim 3, characterized in that, A third transmission column (302m) is slidably installed inside the inner cavity of the second rotating shaft (302h). The circumferential wall of the third transmission column (302m) is adapted to abut against the second transmission column (302k). The second transmission column (302k) is used to drive the third transmission column (302m) to extend into the inner cavity of the first rotating shaft (302d). A third mounting groove (302n) is provided on the outer circumferential wall of the first rotating shaft (302d). The third mounting groove (302n) is connected to the inner cavity of the first rotating shaft (302d). A protrusion (302p) is provided on the inner circumferential wall of the second gear (302e). The protrusion (302p) is slidably connected to the third mounting groove (302n) and extends into the inner cavity of the first rotating shaft (302d). The protrusion (302p) is elastically connected to the first rotating shaft (302d).

5. The concrete crack inspection device as described in claim 4, characterized in that, The third transmission column (302m) is stationary relative to the second rotating shaft (302h) in the circumferential direction.

6. The concrete crack inspection device as described in claim 5, characterized in that, The third transmission column (302m) has a ratchet part (302m-1) on the end face away from the slide rail (301). A ratchet block (302q) is elastically installed in the mating hole (302f) of the mounting block (302a). The ratchet part (302m-1) is adapted to engage with the ratchet block (302q).

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