Bridge crack detection device and method of use

Abstract

The application belongs to the technical field of crack detection, and in particular relates to a bridge crack detection device and a use method thereof. The device comprises a base plate, two symmetrical bidirectional push plates fixedly installed on the base plate through a lifting frame, shaft rods fixedly installed at two ends of the bidirectional push plates, and a group of rotating frames rotatably installed on the two corresponding shaft rods. The distance between the rotating frames on the two sides can be adjusted through the extension and retraction of the bidirectional push plates, so that the distance between the detectors on the rotating frames on the two sides is adjusted, so that the arch soffit under the bridge is detected for cracks. Through the rotation of the rotating frames on the two sides, any position of the arch soffit under the bridge can be detected. The distance between the multiple sleeves on the moving plate is adjusted, so that the detectors on the sleeves are adjusted at equal distances, so that the depth of the cracks is detected in a multi-point manner, representative data is obtained, and the severity of the cracks can be accurately evaluated and a reasonable treatment scheme can be formulated.

Description

Technical Field

[0001] This invention belongs to the field of crack detection technology, specifically a bridge crack detection device and its usage method. Background Technology

[0002] Cracks are one of the most common defects in bridge structures. Their detection is far more complex than simply "checking for cracks." Cracks weaken the effective cross-section of components and reduce their load-bearing capacity. Cracks, especially in the area of ​​reinforcing steel bars, directly affect the bending and shear strength of the bridge. Continuous crack development may be an early warning signal of structural failure. By detecting the width, length, depth, and direction of cracks, we can determine their immediate threat and long-term impact on structural safety.

[0003] Different parts of a bridge have different stress characteristics, so the areas prone to cracking also vary. There are many parts of a bridge that need to be inspected. The bridge deck is easy to inspect, but the bridge bottom is more difficult to inspect. The bottom of the beam (tension zone) is the most critical inspection area. Under load, the bottom of the beam bears tensile stress, and concrete has poor tensile strength, making it very easy to develop vertical bending cracks. The width and number of these cracks directly reflect the load-bearing capacity of the beam.

[0004] The prior art discloses a Chinese patent with application number CN202411514255.X, which discloses a bridge crack detection device. It discloses that by cooperating with the expansion mechanism and the crack, the bridge crack detection device can shorten the distance between the two installation points, so that the two installation points are in the crack to be detected, and avoid the appearance of new cracks between the installation points and the crack to be detected, which would lead to errors in the detection results.

[0005] While the aforementioned device can inspect bridges, it still has some shortcomings in its use:

[0006] Since the depth of a crack is inherently uneven (i.e., "uneven depth"), measuring the depth of only one point only represents the condition of that specific point and cannot represent the depth range of the entire crack. Using this single data point to evaluate the entire crack will lead to one-sided or even erroneous conclusions. If the impact of a crack on the safety of the structure is judged based on this single data point, the judgment is unreliable.

[0007] Bridges of different sizes have different curvatures at their bases, and the distance between the two sides of the bridge also varies. When inspecting the bottom of a bridge for cracks, the equipment is repeatedly moved under the cracks to be inspected, increasing the workload and making it impossible to guarantee that the inspection piece is exactly under the crack. Summary of the Invention

[0008] The purpose of this invention is to provide a bridge crack detection device and its usage method to solve the problem of accurate assessment of cracks through multi-point measurement as mentioned in the background art.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] A bridge crack detection device includes a base plate. Two symmetrically arranged bidirectional push plates are fixedly installed on the base plate via a lifting frame. Shafts are fixedly installed at both ends of the bidirectional push plates. A set of rotating frames is rotatably installed on the two corresponding shafts. An adjustment part for adjusting the angle of the rotating frames is provided on the inner side of one side of the bidirectional push plate. A U-shaped frame is slidably installed between each set of rotating frames via a removal component. A movable plate is slidably installed inside the U-shaped frame. Multiple sleeves are arranged on the movable plate. A detection instrument for detecting cracks is fixedly installed on the sleeve. The movable plate is also provided with a control component for adjusting the position of the multiple detection instruments. A cleaning part is provided on one side of the detection instrument.

[0011] Preferably, the adjusting part includes a fixing member, a rotating ring is rotatably installed inside the fixing member via an electric slider, a sleeve rod is fixedly installed on the inner wall of the rotating ring, inner rods are slidably installed on both sides of the sleeve rod, and connecting members that are fixed to the telescopic ends of the bidirectional push plate are rotatably installed on the outside of the inner rods on both sides, and a bevel gear is fixedly installed at the end of each inner rod on both sides.

[0012] Preferably, a bevel gear one meshes with a bevel gear two fixed to the shaft on one side, and an arc-shaped frame fixedly connected to the bidirectional push plate is symmetrically arranged on the outer side of each rotating frame. A stabilizing groove is opened in the middle of the arc-shaped frame, and a stabilizing shaft fixed to the rotating frame is arranged in the stabilizing groove.

[0013] Preferably, the removal assembly includes ear plates that are fixedly connected to the rotating frame and symmetrically arranged. A connecting rod is rotatably mounted between the two ear plates in each group via a motor. A drive plate is fixedly mounted on the connecting rod. A protruding plate is fixedly mounted on one side of the U-shaped frame, and the protruding plate is rotatably connected to the drive plate.

[0014] Preferably, the control component includes an L-shaped plate connected to multiple sleeves respectively, a central seat on one side of the bottom of the U-shaped frame, a threaded rod rotatably mounted on the central seat, a lifting plate rotatably mounted on the threaded rod, two symmetrical side grooves opened on the inner side of the U-shaped frame, sliding parts slidably mounted in the side grooves, a control plate jointly mounted between the two sliding parts, and multiple sets of inclined grooves opened on the control plate, which respectively sleeve the cylinders on the L-shaped plate.

[0015] Preferably, the sliding component is fixedly connected to the top of the control panel. When the control panel moves down, multiple sets of inclined grooves press the cylinders on the L-shaped plate. At this time, the L-shaped plate drives multiple sleeves to slide on the moving plate.

[0016] Preferably, the cleaning unit includes a side frame fixedly connected to the movable plate, with symmetrically arranged U-shaped seats fixedly installed on both sides of the side frame, a roller rotatably installed in the middle of the U-shaped seat, a roller located in the middle of the U-shaped seat fixedly installed on the roller, and a cam fixedly installed at the end of the roller.

[0017] Preferably, one side of the cam is provided with an air cylinder that is fixedly connected to the side frame, a piston rod is slidably installed inside the air cylinder, and a through groove is provided on one side of the piston rod, into which the round block on the cam is placed.

[0018] Preferably, the side frame is also equipped with multiple spray boxes, and the air cylinder is equipped with an air transmission pipe that communicates with the spray boxes. The air transmission pipe is equipped with a one-way valve. When the gas is compressed into the spray box through the air transmission pipe, the spray box sprays water to clean the bridge.

[0019] Another object of the present invention is to provide a detection method for a bridge crack detection device, comprising the following steps:

[0020] S1: Test Preparation

[0021] The device is placed under the arch of the bridge to be tested. The rotation angle of the rotating frames on both sides is adjusted according to the different arch curvature and height of different bridges. The distance between the rotating frames on both sides can also be adjusted by controlling the bidirectional push plate, thereby controlling the distance between the two detectors.

[0022] S2: Position Adjustment

[0023] By adjusting the spacing between multiple detectors on the moving plate using the control component, it is possible to perform multi-point detection of different locations of the bridge crack when inspecting a bridge crack, thereby enabling comprehensive analysis of the bridge crack depth data.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention utilizes the extension and retraction of a bidirectional push plate to adjust the distance between the rotating frames on both sides, thereby adjusting the distance between the detectors on the rotating frames. This allows for crack detection in the arch area (the arc at the bottom of the bridge) under bridges. Since different bridges have different arch curvatures, the rotating frames placed under the bridge can be rotated to detect any location on the arch area without repeatedly moving and adjusting the entire device. Compared to existing devices, this invention can detect cracks in the arch areas of different bridges. Furthermore, the extension and retraction of the bidirectional push plate allows the rotating frames on both sides to move closer or further apart, enabling simultaneous measurement of the arch areas of different bridges and improving crack detection efficiency.

[0026] 2. This invention, through the setting of the control components, enables the distance between multiple sleeves sliding on the moving plate to be adjusted at equal intervals, thereby allowing the detectors on the sleeves to be adjusted at equal intervals. This enables multi-point detection of crack depth, thereby obtaining representative data, improving the reliability of judgment, and accurately assessing the severity of cracks and formulating reasonable treatment plans.

[0027] 3. By setting the removal component, the present invention ensures that when the rotating frame rotates under the bridge, the U-shaped frame and the detector do not come into contact with the bridge, thereby avoiding damage caused by the detector colliding with the bridge when the rotating frame moves under the bridge.

[0028] 4. In this invention, when the rotating frame rotates, the rollers in the middle of the U-shaped seat rotate at the arch of the bridge. The rollers guide the rotating frame, ensuring smooth and unobstructed rotation. Furthermore, the rotation of the rollers drives the roller shaft, which in turn drives the cam to rotate. The cam, in turn, drives the piston rod to compress the gas inside the air cylinder. The compressed gas is then sent to the spray box, where it washes the cracks in the arch of the bridge. This washing of the cracks facilitates more accurate crack detection by the instrument and cleans the arch area, making it easier to observe even minute cracks. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying 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.

[0030] Figure 1 This is a schematic diagram of the front structure of the overall device of the present invention;

[0031] Figure 2 This is a partial structural schematic diagram of the present invention;

[0032] Figure 3 This is the present invention. Figure 2 A magnified structural diagram of part A;

[0033] Figure 4 This is the present invention. Figure 2 A schematic diagram of the enlarged structure of part B;

[0034] Figure 5 This is a schematic diagram of the structure between the arc-shaped frame and the rotating frame of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the component to be removed in this invention;

[0036] Figure 7 This is a schematic diagram of the control component structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the adjustment part structure of the present invention;

[0038] Figure 9 This is a schematic diagram of the cleaning section structure of the present invention;

[0039] Figure 10 This is a side cross-sectional structural diagram of the sleeve rod and inner rod of the present invention.

[0040] The attached figures are labeled as follows:

[0041] 1. Base plate; 104. Stabilizing shaft; 11. Two-way push plate; 111. Fixing component; 112. Rotating ring; 113. Sleeve rod; 114. Inner rod; 115. Connecting component; 116. Bevel gear one; 12. Shaft rod; 121. Bevel gear two; 122. Arc frame; 123. Stabilizing groove; 13. Rotating frame; 2. U-shaped frame; 20. Moving plate; 201. Protruding plate; 21. Ear plate; 22. Connecting rod 23. Drive plate; 24. Sleeve; 241. L-shaped plate; 25. Center seat; 251. Threaded rod; 252. Lifting plate; 253. Side groove; 254. Sliding component; 255. Control plate; 256. Inclined groove; 3. Detector; 4. Side frame; 41. U-shaped seat; 42. Roller; 43. Roller; 44. Cam; 45. Air cylinder; 46. Piston rod; 47. Air transmission pipe; 48. Spray box. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1-10 As shown, the present invention is a bridge crack detection device, including a base plate 1. Two symmetrically arranged bidirectional push plates 11 are fixedly installed on the base plate 1 via a lifting frame. A shaft 12 is fixedly installed at both ends of the bidirectional push plates 11. A set of rotating frames 13 is rotatably installed on the two corresponding shafts 12. An adjustment part for adjusting the angle of the rotating frames 13 is provided on the inner side of one side of the bidirectional push plate 11. A U-shaped frame 2 is slidably installed between each set of rotating frames 13 via a removal component. A movable plate 20 is slidably installed inside the U-shaped frame 2. Multiple sleeves 24 are arranged on the movable plate 20. A detector 3 for detecting cracks is fixedly installed on the sleeves 24. The movable plate 20 is also provided with a control component for adjusting the position of the multiple detectors 3. A cleaning part is provided on one side of the detector 3.

[0044] The extension and retraction of the bidirectional push plate 11 can adjust the distance between the rotating frames 13 on both sides, thereby adjusting the distance between the detectors 3 on the rotating frames 13 on both sides. This allows for simultaneous detection on both sides when detecting cracks in the arch (the arc at the bottom of the bridge), thus improving detection efficiency.

[0045] By adjusting the mechanism, the inner rods 114 on both sides can move synchronously with the two sides of the bidirectional push plate 11 while the bidirectional push plate 11 extends and retracts. This ensures that when the distance between the rotating frames 13 on both sides is adjusted, the rotating rods 113 can also synchronously drive the rotating frames 13 on both sides to adjust their angle on the bidirectional push plate 11. Since the curvature of the arch of different bridges is different, when the rotating frames 13 on both sides are placed under the bridge, the rotation of the rotating frames 13 on both sides can be used to detect any position of the arch under the bridge without having to repeatedly move and adjust the entire device. Furthermore, the rotating frames 13 on both sides are symmetrically arranged. The entire device can be placed directly under the arch of the bridge to simultaneously detect both sides of the arch. Compared with existing devices, this invention can meet the crack detection needs of the arch of different bridges. Moreover, by extending and retracting the bidirectional push plate 11, the rotating frames 13 on both sides can move closer or further apart, which can meet the synchronous measurement needs of the arch of different bridges, thereby improving the crack detection efficiency.

[0046] Because bridge cracks have a certain length and the depth of the same crack varies, depth detection at a single point of the crack often yields unrepresentative data. Judging the impact of a crack on structural safety based on this single data point is unreliable. A more representative dataset is obtained by measuring the depth at regular intervals (e.g., 20-50 cm) along the crack's length. Based on data from multiple measurement points, the maximum, minimum, and average depths of the crack, as well as the pattern of depth variation, can be determined. Therefore, by adjusting the components, the distance between the multiple sliding frames 24 on the movable plate 20 can be adjusted at equal intervals, allowing for equal-distance adjustment of the detectors 3 on the frames 24. This enables multi-point detection of crack depth. Only by combining the multi-point data to obtain the average depth can the severity of the crack be accurately assessed and a reasonable treatment plan developed.

[0047] By setting the removal component, the U-shaped frame 2 and the detector 3 do not come into contact with the bridge when the rotating frame 13 rotates under the bridge. This avoids the detector 3 from colliding with the bridge and causing damage when the rotating frame 13 moves under the bridge. When the rotating frame 13 moves to the crack position under the bridge, the moving component is activated to move the detector 3 out of the rotating frame 13 until the detector 3 is close to the crack to be detected.

[0048] The adjustment part includes a fixing member 111. A rotating ring 112 is rotatably mounted inside the fixing member 111 via an electric slider. A sleeve rod 113 is fixedly mounted on the inner wall of the rotating ring 112. Inner rods 114 are slidably mounted on both sides of the sleeve rod 113. Connecting members 115 that are fixed to the telescopic ends of the bidirectional push plate 11 are rotatably mounted on the outside of the inner rods 114 on both sides. A bevel gear 116 is fixedly mounted on the end of the inner rods 114 on both sides.

[0049] It can be explained that when the bidirectional push plate 11 is opened and extended, the two connecting pieces 115 drive the inner rods 114 on both sides to extend and retract, respectively following the extension and retraction of the two sides of the bidirectional push plate 11. This ensures that the bevel gear 116 on the inner rod 114 is always engaged with the bevel gear 121 on the shaft 12. So that when the electric slider is opened and drives the rotating ring 112 to rotate, the rotating ring 112 drives the inner rod 114 to rotate through the sleeve rod 113. The inner rod 114 can extend and retract within the sleeve rod 113 and also rotate with the sleeve rod 113. The structure between the sleeve rod 113 and its internal parts can be found in [reference needed]. Figure 10 When the inner rod 114 rotates, it drives the first bevel gear 116 to rotate. When the first bevel gear 116 rotates, it drives the second bevel gear 121 to rotate. When the second bevel gear 121 rotates, it drives the rotating frame 13 to rotate through the shaft 12. This allows the angle of the rotating frame 13 on the bidirectional push plate 11 to be adjusted. By adjusting the angle of the rotating frame 13, the detector 3 can perform adaptive testing on different bridges with different arch curvatures.

[0050] A bevel gear 116 is meshed with a bevel gear 121 fixed to the shaft 12 on one side. Each set of rotating frames 13 is symmetrically provided with arc-shaped frames 122 fixedly connected to the bidirectional push plate 11 on the outer side. A stabilizing groove 123 is provided in the middle of the arc-shaped frame 122. A stabilizing shaft 104 fixed to the rotating frame 13 is provided in the stabilizing groove 123.

[0051] It can be explained that when the rotating frame 13 rotates at the end of the bidirectional push plate 11, the stabilizing shaft 104 on one side of the rotating frame 13 can slide in the stabilizing groove 123 along with the rotation of the rotating frame 13, thereby making the rotating frame 13 more stable when rotating.

[0052] The removal assembly includes ear plates 21 that are fixedly connected to the rotating frame 13 and symmetrically arranged. A connecting rod 22 is mounted between the two ear plates 21 in each group via a motor. A drive plate 23 is fixedly mounted on the connecting rod 22. A protruding plate 201 is fixedly mounted on one side of the U-shaped frame 2. The protruding plate 201 is rotatably connected to the drive plate 23.

[0053] When the U-shaped frame 2 is moved out on a set of rotating frames 13, the motor is turned on and drives the connecting rod 22 to rotate. When the connecting rod 22 rotates, it drives the drive plate 23 to rotate. When the drive plate 23 rotates, it pushes the protruding plate 201. When the protruding plate 201 is pushed, it synchronously drives the U-shaped frame 2 to move. When the U-shaped frame 2 moves, it moves out from the top, so that the detector 3 on the rotating frame 13 can approach the crack to perform depth detection.

[0054] The control assembly includes an L-shaped plate 241 connected to multiple sleeves 24 respectively, a center seat 25 on one side of the bottom of the U-shaped frame 2, a threaded rod 251 rotatably mounted on the center seat 25, a lifting plate 252 rotatably mounted on the threaded rod 251, two symmetrical side grooves 253 opened on the inner side of the U-shaped frame 2, a sliding member 254 slidably mounted in the side groove 253, a control plate 255 jointly mounted between the two sliding members 254, and multiple sets of inclined grooves 256 opened on the control plate 255, which respectively sleeve the cylinders on the L-shaped plate 241;

[0055] When multiple detectors 3 perform multi-point detection on different locations of a crack, the threaded rod 251 on the rotating center seat 25 rotates. As the threaded rod 251 rotates, it drives the lifting plate 252 to rise and fall. When the threaded rod 251 is rotated clockwise, the lifting plate 252 rises on the threaded rod 251; when the threaded rod 251 is rotated counterclockwise, the lifting plate 252 falls on the threaded rod 251. As the lifting plate 252 moves downward, it simultaneously drives the control plate 255 to descend. At this time, the sliding parts 254 on both sides of the control plate 255 slide within the side grooves 253 on both sides. When the lifting plate 252 moves downward, it presses down on the cylinders on the L-shaped plate 241 through multiple sets of inclined grooves 256. After being compressed, the cylinders on the L-shaped plate 241... The corresponding sleeve 24 slides at equal intervals on the moving plate 20 with the middle sleeve 24 as the reference. It should be noted that since the inclined grooves 256 on both sides are symmetrically arranged and the inclined groove 256 in the middle is vertically arranged, the middle sleeve 24 is always stationary on the moving plate 20. When the sleeve 24 moves, it synchronously drives the detector 3 above it to move, so as to meet the requirement of multi-point detection of bridge cracks. Compared with the existing device, the present invention can perform multi-point depth detection when detecting cracks in the arch under the bridge by means of the multi-point arrangement of the detector 3. Furthermore, by adjusting the distance between multiple detectors 3, the depth of a point is measured at certain intervals, and the distance between the measured points is consistent.

[0056] The slider 254 is fixedly connected to the top of the control plate 255. When the control plate 255 moves down, multiple sets of inclined grooves 256 press the cylinders on the L-shaped plate 241 respectively. At this time, the L-shaped plate 241 drives multiple sleeves 24 to slide on the moving plate 20.

[0057] The cleaning unit includes a side frame 4 fixedly connected to the movable plate 20. U-shaped seats 41 are symmetrically arranged on both sides of the side frame 4. A roller 42 is rotatably mounted in the middle of the U-shaped seat 41. A roller 43 located in the middle of the U-shaped seat 41 is fixedly mounted on the roller 42. A cam 44 is fixedly mounted at the end of the roller 42.

[0058] As the rotating frame 13 rotates, the roller 43 in the middle of the U-shaped seat 41 rotates at the arch of the bridge. The roller 43 guides the rotating frame 13, ensuring its smooth rotation. Simultaneously, the roller 43 drives the roller 42 to rotate, which in turn drives the cam 44. The cam 44, in turn, compresses the piston rod 46 within the air cylinder 45. When the air pressure in the air cylinder 45 is compressed by the piston rod 46, the gas is compressed into the spray box 48 through the air transmission pipe 47. The spray box 48 then washes the cracks in the arch of the bridge. This washing of the cracks by the spray box 48 allows the detector 3 to more accurately detect cracks and also cleans the arch of the bridge, making it easier to observe even small cracks.

[0059] A cylinder 45 is fixedly connected to the side frame 4 on one side of the cam 44. A piston rod 46 is slidably installed inside the cylinder 45. A through groove is provided on one side of the piston rod 46. The round block on the cam 44 is placed into the through groove.

[0060] The side frame 4 is also equipped with multiple spray boxes 48. The air cylinder 45 is equipped with an air transmission pipe 47 that is connected to the spray box 48. The air transmission pipe 47 is equipped with a one-way valve. When the gas is compressed into the spray box 48 through the air transmission pipe 47, the spray box 48 sprays water to clean the bridge.

[0061] Another object of the present invention is to provide a detection method for a bridge crack detection device, comprising the following steps:

[0062] S1: Test Preparation

[0063] The device is placed under the arch of the bridge to be tested. The rotation angle of the rotating frame 13 on both sides is adjusted according to the different arch curvature and height of different bridges. The distance between the rotating frame 13 on both sides can also be adjusted by controlling the bidirectional push plate 11, thereby controlling the distance between the two detectors 3.

[0064] S2: Position Adjustment

[0065] By adjusting the spacing between multiple detectors 3 on the moving plate 20 using the control component, multiple detectors 3 can perform multi-point detection at different locations of the bridge crack when detecting a bridge crack, thereby enabling comprehensive analysis of the bridge crack depth data.

[0066] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A bridge crack detection device, comprising a base plate (1), characterized in that, Two symmetrically arranged bidirectional push plates (11) are fixedly installed on the base plate (1) by a lifting frame. A shaft (12) is fixedly installed at both ends of the bidirectional push plate (11). A set of rotating frames (13) is rotatably installed on the two corresponding shafts (12). An adjustment part for adjusting the angle of the rotating frame (13) is provided on the inner side of one side of the bidirectional push plate (11). A U-shaped frame (2) is slidably installed between each set of rotating frames (13) through a removal component. A moving plate (20) is slidably installed inside the U-shaped frame (2). Multiple sleeves (24) are arranged on the moving plate (20). A detector (3) for detecting cracks is fixedly installed on the sleeve (24). A control component for adjusting the position of multiple detectors (3) is also provided on the moving plate (20). A cleaning part is provided on one side of the detector (3). The control assembly includes an L-shaped plate (241) connected to multiple sleeves (24) respectively, a center seat (25) on one side of the bottom of the U-shaped frame (2), a threaded rod (251) rotatably mounted on the center seat (25), a lifting plate (252) rotatably mounted on the threaded rod (251), two symmetrical side grooves (253) opened on the inner side of the U-shaped frame (2), a sliding piece (254) slidably mounted in the side groove (253), a control plate (255) jointly mounted between the two sliding pieces (254), multiple sets of inclined grooves (256) opened on the control plate (255), the multiple sets of inclined grooves (256) respectively sleeve the cylinder on the L-shaped plate (241), the inclined grooves (256) on both sides are symmetrically arranged, and the inclined groove (256) in the middle is vertically arranged; The sliding member (254) is fixedly connected to the top of the control plate (255). When the control plate (255) moves down, multiple sets of inclined grooves (256) press the cylinder on the L-shaped plate (241) respectively. At this time, the L-shaped plate (241) drives multiple sleeves (24) to slide on the moving plate (20).

2. The bridge crack detection device according to claim 1, characterized in that, The adjustment part includes a fixing member (111), a rotating ring (112) is rotatably installed inside the fixing member (111) via an electric slider, a sleeve rod (113) is fixedly installed on the inner wall of the rotating ring (112), inner rods (114) are slidably installed on both sides of the sleeve rod (113), and connecting parts (115) that are fixed to the telescopic end of the bidirectional push plate (11) are rotatably installed on the outside of the inner rods (114) on both sides, and bevel gears (116) are fixedly installed at the ends of the inner rods (114) on both sides.

3. The bridge crack detection device according to claim 2, characterized in that, The first bevel gear (116) is meshed with a second bevel gear (121) fixed to the shaft (12) on one side. Each set of rotating frames (13) is symmetrically arranged with arc-shaped frames (122) fixedly connected to the bidirectional push plate (11) on the outer side. A stabilizing groove (123) is opened in the middle of the arc-shaped frame (122), and a stabilizing shaft (104) fixed to the rotating frame (13) is arranged in the stabilizing groove (123).

4. The bridge crack detection device according to claim 1, characterized in that, The removal assembly includes ear plates (21) that are fixedly connected to the rotating frame (13) and symmetrically arranged. A connecting rod (22) is mounted between the two ear plates (21) in each group via a motor. A drive plate (23) is fixedly mounted on the connecting rod (22). A protruding plate (201) is fixedly mounted on one side of the U-shaped frame (2). The protruding plate (201) is rotatably connected to the drive plate (23).

5. A bridge crack detection device according to claim 1, characterized in that, The cleaning unit includes a side frame (4) fixedly connected to the movable plate (20). U-shaped seats (41) are symmetrically arranged on both sides of the side frame (4). A roller (42) is rotatably installed in the middle of the U-shaped seat (41). A roller (43) located in the middle of the U-shaped seat (41) is fixedly installed on the roller (42). A cam (44) is fixedly installed at the end of the roller (42).

6. A bridge crack detection device according to claim 5, characterized in that, The cam (44) has an air cylinder (45) fixedly connected to the side frame (4) on one side. A piston rod (46) is slidably installed inside the air cylinder (45). A through groove is provided on one side of the piston rod (46), and the round block on the cam (44) is placed into the through groove.

7. A bridge crack detection device according to claim 6, characterized in that, The side frame (4) is also equipped with multiple spray boxes (48). The air cylinder (45) is equipped with an air transmission pipe (47) that is connected to the spray box (48). The air transmission pipe (47) is equipped with a one-way valve. When the gas is compressed into the spray box (48) through the air transmission pipe (47), the spray box (48) sprays water to clean the bridge.

8. A detection method for a bridge crack detection device, applied to the bridge crack detection device described in claim 1, characterized in that, Includes the following steps: S1: Test Preparation The device is placed under the bridge arch of the bridge to be tested. The rotation angle of the two rotating frames (13) is adjusted according to the different arch curvature and height of different bridges. The distance between the two rotating frames (13) can also be adjusted by controlling the two-way push plate (11), thereby controlling the distance between the two detectors (3). S2: Position Adjustment By adjusting the spacing between multiple detectors (3) on the moving plate (20) through the control component, multiple detectors (3) can perform multi-point detection of different locations of the bridge crack when detecting a bridge crack, thereby conducting a comprehensive analysis of the bridge crack depth data.

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