Road and bridge defect detector based on ultrasonic springback

Abstract

The invention relates to the technical field of automobile testing fixtures, and particularly discloses a road and bridge defect detector based on ultrasonic springback, which comprises a fixed frame and a table top, a fixed plate is fixedly mounted on the lower side of the rear end of the fixed frame, traveling wheels are rotatably connected to the inner side of the fixed plate, a round rod is fixedly mounted between the two traveling wheels on one side, and the round rod is rotatably connected to the inner side of the fixed plate. A driving part is arranged on one side of the round rod, the table top is in a U shape, mounting blocks are fixedly mounted on the front and rear sides of the left and right ends of the table top, and when the table top is placed at the upper end of the fixing frame, the mounting blocks and the upper end and the side end of the fixing frame are clamped and fixed through bolts; the other end of the driving rod is driven by the driving part to drive the rack to move back and forth in the sliding sleeve, so that the half gear is driven to walk back and forth at the upper end of the rack, the extension rod is driven to drive the rotating rod to rotate back and forth, the rotating rod drives the mounting plate, the transmitter and the receiving equipment to swing left and right during reciprocating rotation, and the detection area is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive inspection tools, and specifically to a road and bridge defect detector based on ultrasonic rebound. Background Technique

[0002] With the continuous evolution of the economic system, the road and bridge projects in our country have shown unprecedented complexity. The dependence on high-standard test and detection technologies during the construction process reflects the urgency and importance of technological development in this field. High-quality test and detection not only affect the overall quality of road and bridge projects but are also key factors in ensuring construction safety and enhancing project effects. To achieve this goal, attention must be paid to the inspection of building materials, and the optimization of technical parameters has become an indispensable part. However, in actual operation, there are still defects in the detection work, which poses higher requirements for engineering personnel. Engineering personnel must deeply understand the importance of detection technologies and formulate more perfect and scientific detection plans in combination with the specific situation of the project.

[0003] Ultrasonic detection technology also plays an important role in the field of road and bridge project detection. With its characteristics of high safety, convenient operation, and non-destructive detection, it is widely used in various stages of road and bridge projects, including before and after construction, use and maintenance periods, etc. Its basic principle is to emit ultrasonic pulses to the object to be measured through a sound wave converter, and judge the integrity of the internal structure of the object based on data such as the propagation speed, main frequency, and wave amplitude change of the sound wave in the medium. The non-destructive characteristic of this technology ensures that the detection process will not cause damage to the road and bridge structure. In road and bridge detection, ultrasonic waves can effectively detect cracks and voids inside concrete. Ultrasonic detection technology has extremely high detection accuracy and can provide detailed information about the size, location, and complexity of defects. Compared with ground-penetrating radar detection technology, which focuses on detecting the underground structure of large areas, ultrasonic detection is more suitable for detailed defect detection of specific components and local structures.

[0004] Currently, after a bridge is completed and opened to traffic, there will be disadvantages of cracks and defects that cannot be observed inside. Due to these internal cracks or other problems and disadvantages, they are not easy to discover. Therefore, it is inconvenient for the staff to carry out timely repairs, which is likely to cause potential safety hazards. For this reason, the present invention proposes a road and bridge defect detector based on ultrasonic rebound to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a road and bridge defect detector based on ultrasonic rebound to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present invention provides the following technical solution: A road and bridge defect detector based on ultrasonic rebound, comprising: a fixed frame and a tabletop. A fixed plate is fixedly installed on the lower side of the rear end of the fixed frame. A walking wheel is rotatably connected to the inner side of the fixed plate. A round rod is fixedly installed between two walking wheels on one side. A driving component is arranged on one side of the round rod; The tabletop is U-shaped. Installation blocks are fixedly installed on the front and rear sides of the left and right ends of the tabletop. When the tabletop is placed on the upper end of the fixed frame, the installation blocks are clamped and fixed to the upper end and the side end of the fixed frame through bolts. A processing device is fixedly installed on the upper end of the tabletop. A lifting plate is installed on the lower end of the tabletop in a liftable manner. Vertical plates are fixedly installed on the front and rear sides of the lower end of the lifting plate. A rotating rod is rotatably connected between the two vertical plates. One end of the rotating rod passes through one of the ear plates and is connected to a swinging component. The lower end of the rotating rod is fixedly installed with a mounting plate through a connecting block. A transmitter and a receiving device are respectively fixedly installed on the lower end of the mounting plate.

[0007] Preferably, a threaded sleeve is fixedly installed on one side of the upper end of the tabletop, and a guide sleeve is fixedly installed on the other side. The lower ends of the threaded sleeve and the guide sleeve both pass through the upper and lower side walls of the tabletop. A threaded rod is threadedly connected inside the threaded sleeve. The lower end of the threaded rod passes through the threaded sleeve and is rotatably connected to one side of the upper end of the lifting plate. An anti-slip cap is fixedly installed on the upper end of the threaded rod. A guide rod is slidably inserted into the guide sleeve. The lower end of the guide rod passes through the guide sleeve and is fixedly connected to the other side of the upper end of the lifting plate.

[0008] Preferably, threaded holes are opened on the side walls of the front, rear, left, and right ends of the fixed frame. The installation block is L-shaped. One end of the installation block is located outside the threaded hole. The bolt passes through the installation block and is threadedly connected to the inner wall of the threaded hole.

[0009] Preferably, there are two connecting blocks. The lower ends of the two connecting blocks are respectively fixedly installed on the left and right sides of the upper end of the mounting plate. The upper ends of the two connecting blocks are respectively fixed on the side walls of the left and right sides of the rotating rod.

[0010] Preferably, the swinging component includes a rack and a half gear. An extension rod is fixedly installed on the upper end of the half gear. The extension rod is fixedly installed on the outer wall of one end of the rotating rod. Sliding sleeves are slidably sleeved on the outer walls of the left and right ends of the rack. A support rod four is fixedly installed on the upper end of the sliding sleeve. The upper end of the support rod four is fixedly installed on the lower side of one end of the lifting plate. The outer wall of the half gear is meshed with the outer wall of the rack.

[0011] Preferably, the driving component includes a bevel gear one, a shaft rod one, and a shaft rod two. The bevel gear one is fixedly installed on the outer wall of one end of the round rod. A bearing one is sleeved on the outer wall of the shaft rod one. A support rod one is fixedly installed on the outer wall of one end of the bearing one. The other end of the support rod one is fixedly installed on the outer wall of the fixed plate.

[0012] Preferably, a chute is provided at the lower end of the first shaft rod. A slide rod is slidably connected in the chute. A second bearing is fixedly sleeved on the outer wall of the slide rod. A second support rod is fixedly installed on the outer wall of one end of the second bearing. An electric push rod is fixedly installed at the upper end of the second support rod. The upper end of the electric push rod is fixedly connected to the lower end of the first support rod.

[0013] Preferably, a turntable is fixedly installed at one end of the second shaft rod, and a second bevel gear is fixedly installed at the other end. The outer walls of the second bevel gear and the second cone gear are meshed. A third bearing is fixedly sleeved on the outer wall of the second shaft rod. A third support rod is fixedly installed on the outer wall of one end of the third bearing. An ear plate is fixedly installed on the outer wall of the end of the third support rod away from the third bearing. One end of the ear plate is fixed to the outer wall of the fixed plate.

[0014] Preferably, one end of the turntable is rotatably connected to a driving rod, and the other end of the driving rod is rotatably connected to the side wall of one end of the rack.

[0015] Preferably, a handle is fixedly installed obliquely on one side of the upper end of the fixed frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By placing the tabletop on the upper end of the fixed frame, the mounting block is lapped on the upper end and the outer side of the outer end of the fixed frame. One end of the mounting block is located outside the threaded hole. After the bolt passes through the mounting block, it is threadedly connected to the inner wall of the threaded hole to fix the tabletop. Then, the ear plate is fixed to the side wall of the fixed plate by bolts. When performing ultrasonic detection on road bridges, the electric push rod is started to engage the first cone gear and the first bevel gear, and then the fixed frame is pushed to move. When the walking wheel rotates, it will drive the first bevel gear to rotate, thereby driving the first cone gear, the slide rod, the first shaft rod, and the second cone gear to rotate. When the second cone gear rotates, it drives the second shaft rod and the turntable to rotate through the meshed second bevel gear. When the turntable rotates, it will drive one end of the driving rod to move back and forth. The other end of the driving rod drives the rack to move back and forth in the sliding sleeve, thereby driving the half gear to reciprocate on the upper end of the rack, and then driving the extension rod to drive the rotating rod to rotate reciprocally. When the rotating rod rotates reciprocally, it will drive the mounting plate and the transmitter and the receiving device to swing left and right, increasing the detection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the processing device and the fixed frame of the present invention in an unfolded state; Figure 3 It is a bottom view of the fixed frame of the present invention; Figure 4 It is a schematic diagram of the lower end structure of the processing device of the present invention; Figure 5 It is a bottom view of a partial structure of the present invention; Figure 6Schematic diagram of the swing component structure of the present invention; Figure 7 Schematic diagram of the driving component structure of the present invention; Figure 8 For the present invention Figure 3 Enlarged view of the structure of area A in; Figure 9 For the present invention Figure 4 Enlarged view of the structure of area B in.

[0018] In the figure: 1, fixed frame; 2, fixed plate; 3, traveling wheel; 4, round rod; 5, bevel gear one; 6, support rod one; 7, bearing one; 8, shaft rod one; 9, bevel gear two; 10, chute; 11, sliding rod; 12, bevel gear one; 13, bearing two; 14, support rod two; 15, electric push rod; 16, ear plate; 17, support rod three; 18, bearing three; 19, shaft rod two; 20, bevel gear two; 21, turntable; 22, driving rod; 23, rack; 24, sliding sleeve; 25, support rod four; 26, table top; 27, mounting block; 28, processing equipment; 29, lifting plate; 30, threaded sleeve; 31, guide sleeve; 32, threaded rod; 33, guide rod; 34, vertical plate; 35, rotating rod; 36, connecting block; 37, mounting plate; 38, transmitter; 39, receiving equipment; 40, extension rod; 41, semi-gear; 42, handle. Specific embodiments

[0019] In order to clearly and completely describe the objectives, technical solutions of the present invention and make the advantages more clearly understood, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Embodiment 1 Please refer to Figures 1-9, the present invention provides a technical solution: a road and bridge defect detector based on ultrasonic rebound, comprising: a fixed frame 1 and a tabletop 26. The fixed frame 1 is in a mouth shape. A fixed plate 2 is fixedly installed on the lower side of the rear end of the fixed frame 1. A walking wheel 3 is rotatably connected to the inner side of the fixed plate 2. A universal wheel is installed on the lower side of the front end of the fixed frame 1. The fixed frame 1 is driven to move on the bridge surface by the walking wheel 3 and the universal wheel. A round rod 4 is fixedly installed between two walking wheels 3 on one side. A driving component is arranged on one side of the round rod 4. The tabletop 26 is in a U shape. A processing device 28 is fixedly installed on the upper end of the tabletop 26. Installation blocks 27 are fixedly installed on the front and rear sides of the left and right ends of the tabletop 26. The installation blocks 27 are in an L shape. When the tabletop 26 is placed on the upper end of the fixed frame 1, the installation blocks 27 are clamped with the upper end and the side end of the fixed frame 1 and fixed by bolts. Threaded holes are opened on the side walls of the front and rear sides of the left and right ends of the fixed frame 1. One end of the installation block 27 is located outside the threaded hole. After the bolt passes through the installation block 27, it is threadedly connected with the inner wall of the threaded hole to fix the tabletop 26, and at the same time, it is also convenient to disassemble and assemble the tabletop 26 and the processing device 28.

[0021] A lifting plate 29 is installed on the lower end of the tabletop 26 in a liftable manner. Vertical plates 34 are fixedly installed on the front and rear sides of the lower end of the lifting plate 29. A rotating rod 35 is rotatably connected between the two vertical plates 34. One end of the rotating rod 35 passes through one of the vertical plates 34 and is connected with a swinging component. The lower end of the rotating rod 35 is fixedly installed with a mounting plate 37 through a connecting block 36. There are two connecting blocks 36. The lower ends of the two connecting blocks 36 are respectively fixedly installed on the left and right sides of the upper end of the mounting plate 37. The upper ends of the two connecting blocks 36 are respectively fixed on the side walls of the left and right sides of the rotating rod 35. A transmitter 38 and a receiving device 39 are respectively fixedly installed on the lower end of the mounting plate 37. The swinging component can drive the rotating rod 35 to rotate left and right. When the rotating rod 35 rotates left and right, it will drive the mounting plate 37 and the transmitter 38 and the receiving device 39 to swing left and right. When the fixed frame 1 is pushed to move on the bridge surface, the mounting plate 37 and the transmitter 38 and the receiving device 39 swing left and right at the lower end of the fixed frame 1, increasing the detection area.

[0022] The swinging component includes a rack 23 and a half gear 41. An extension rod 40 is fixedly installed on the upper end of the half gear 41. The extension rod 40 is fixedly installed on the outer wall of one end of the rotating rod 35. Sliding sleeves 24 are slidably sleeved on the outer walls of the left and right ends of the rack 23. A support rod four 25 is fixedly installed on the upper end of the sliding sleeve 24. The upper end of the support rod four 25 is fixedly installed on the lower side of one end of the lifting plate 29. The outer wall of the half gear 41 is meshed with the outer wall of the rack 23. The driving component will drive the rack 23 to reciprocate in the sliding sleeve 24. When the rack 23 reciprocates, it will drive the half gear 41 to reciprocate on the upper end of the rack 23, thereby driving the extension rod 40 to drive the rotating rod 35 to reciprocate. When the rotating rod 35 reciprocates, it will drive the mounting plate 37 and the transmitter 38 and the receiving device 39 to swing left and right, increasing the detection area.

[0023] The driving component includes bevel gear 1-5, shaft rod 1-8 and shaft rod 2-19. Bevel gear 1-5 is fixedly installed on the outer wall of one end of round rod 4. When the device is pushed, the driving wheel 3 will rotate, thus driving the rotation of round rod 4 and bevel gear 1-5. A bearing 1-7 is sleeved on the outer wall of shaft rod 1-8. A support rod 1-6 is fixedly installed on the outer wall of one end of bearing 1-7. The inner wall of bearing 1-7 is fixed on the outer wall of shaft rod 1-8. The outer wall of bearing 1-7 is fixedly connected to one end of shaft rod 1-8. The other end of support rod 1-6 is fixedly installed on the outer wall of fixed plate 2, rotatably supporting shaft rod 1-8.

[0024] A turntable 21 is fixedly installed at one end of shaft rod 2-19, and a bevel gear 2-20 is fixedly installed at the other end. The outer walls of bevel gear 2-20 and bevel gear 2-9 are meshed and connected. A bearing 3-18 is fixedly sleeved on the outer wall of shaft rod 2-19. A support rod 3-17 is fixedly installed on the outer wall of one end of bearing 3-18. The inner wall of bearing 3-18 is fixedly sleeved on the outer wall of shaft rod 2-19. The outer wall of bearing 3-18 is fixedly connected to one end of support rod 3-17. The outer wall of the end of support rod 3-17 away from bearing 3-18 is fixedly installed with an ear plate 16. One end of ear plate 16 is fixed on the outer wall of fixed plate 2 by bolts.

[0025] A chute 10 is opened at the lower end of shaft rod 1-8. A sliding rod 11 is slidably connected in chute 10. Both chute 10 and sliding rod 11 are hexagonal. Sliding rod 11 can slide up and down in chute 10, and when sliding rod 11 rotates, it can drive the rotation of shaft rod 1-8. A bearing 2-13 is fixedly sleeved on the outer wall of sliding rod 11. A support rod 2-14 is fixedly installed on the outer wall of one end of bearing 2-13. The inner wall of bearing 2-13 is fixedly connected to the outer wall of sliding rod 11. The outer wall of bearing 2-13 is fixedly connected to one end of support rod 2-14. The upper end of support rod 2-14 is fixedly installed with an electric push rod 15. The upper end of electric push rod 15 is fixedly connected to the lower end of support rod 1-6. When electric push rod 15 is started, it can drive sliding rod 11 to move in the vertical direction. When the output end of electric push rod 15 extends, bevel gear 1-12 and bevel gear 1-5 are meshed and connected. When driving wheel 3 rotates, it will drive the rotation of bevel gear 1-5, thus driving the rotation of bevel gear 1-12, sliding rod 11, shaft rod 1-8 and bevel gear 2-9. When bevel gear 2-9 rotates, it drives the rotation of shaft rod 2-19 and turntable 21 through the meshed bevel gear 2-20. When the output end of electric push rod 15 retracts, bevel gear 1-12 and bevel gear 1-5 are separated, and when driving wheel 3 rotates, it does not drive the rotation of bevel gear 1-12.

[0026] One end of the turntable 21 is rotatably connected to a driving rod 22, and the other end of the driving rod 22 is rotatably connected to one end side wall of the rack 23. When the turntable 21 rotates, it will drive one end of the driving rod 22 to move back and forth. The other end of the driving rod 22 drives the rack 23 to move back and forth in the sliding sleeve 24, thereby driving the half gear 41 to reciprocate on the upper end of the rack 23, thereby driving the extension rod 40 to drive the rotating rod 35 to reciprocate. When the rotating rod 35 reciprocates, it will drive the mounting plate 37, the transmitter 38 and the receiving device 39 to swing left and right, increasing the detection area.

[0027] Specifically, by placing the tabletop 26 on the upper end of the fixed frame 1, the mounting block 27 is lapped on the upper end and the outer side of the outer end of the fixed frame 1. One end of the mounting block 27 is located outside the threaded hole. After the bolt passes through the mounting block 27, it is threadedly connected to the inner wall of the threaded hole to fix the tabletop 26. Then, the ear plate 16 is fixed to the side wall of the fixed plate 2 by bolts. When performing ultrasonic detection on the road bridge operation, the electric push rod 15 is started to engage the bevel gear one 12 and the bevel gear one 5, and then the fixed frame 1 is pushed to move. When the traveling wheel 3 rotates, it will drive the bevel gear one 5 to rotate, thereby driving the bevel gear one 12, the sliding rod 11, the shaft rod one 8 and the bevel gear two 9 to rotate. When the bevel gear two 9 rotates, it drives the shaft rod two 19 and the turntable 21 to rotate through the engaged bevel gear two 20. When the turntable 21 rotates, it will drive one end of the driving rod 22 to move back and forth. The other end of the driving rod 22 drives the rack 23 to move back and forth in the sliding sleeve 24, thereby driving the half gear 41 to reciprocate on the upper end of the rack 23, thereby driving the extension rod 40 to drive the rotating rod 35 to reciprocate. When the rotating rod 35 reciprocates, it will drive the mounting plate 37, the transmitter 38 and the receiving device 39 to swing left and right. When moving, the transmitter 38 emits ultrasonic pulses to the lower bridge surface, and the received signal is received by the receiving device 39 and sent to the processing device 28 for processing, increasing the detection area.

[0028] Embodiment 2 As Figure 1 and Figure 2 shown, on the basis of Embodiment 1, a threaded sleeve 30 is fixedly installed on one side of the upper end of the tabletop 26, and a guide sleeve 31 is fixedly installed on the other side. The lower ends of the threaded sleeve 30 and the guide sleeve 31 both pass through the upper and lower side walls of the tabletop 26. A threaded rod 32 is threadedly connected in the threaded sleeve 30. After the lower end of the threaded rod 32 passes through the threaded sleeve 30, it is rotatably connected to one side of the upper end of the lifting plate 29. The upper end of the threaded rod 32 is fixedly installed with an anti-slip cap. A guide rod 33 is slidably inserted into the guide sleeve 31. The lower end of the guide rod 33 passes through the guide sleeve 31 and is fixedly connected to the other side of the upper end of the lifting plate 29. By holding the anti-slip cap and rotating, the threaded rod 32 can be driven to rotate in the threaded sleeve 30, thereby driving the lifting plate 29 to move at the lower end of the tabletop 26. At the same time, the guide sleeve 31 slides on the outer wall of the guide rod 33.

[0029] Embodiment III As Figure 1 shown, on the basis of Embodiment I, a handle 42 is fixedly installed obliquely on one side of the upper end of the fixed frame 1. The handle 42 is fixed to the upper end of the traveling wheel 3, and an anti-slip sleeve is sleeved on the outer wall of the upper end of the handle 42. By holding the anti-slip sleeve at the upper end of the handle 42, it is convenient to push the device to move.

[0030] In actual use, by placing the tabletop 26 on the upper end of the fixed frame 1, the mounting block 27 is lapped on the upper end and the outer side of the outer end of the fixed frame 1. After the bolt passes through the mounting block 27, it is threadedly connected to the inner wall of the threaded hole to fix the tabletop 26. Then, the ear plate 16 is fixed to the side wall of the fixed plate 2 by bolts. When performing ultrasonic detection on the road bridge, the electric push rod 15 is started to engage the bevel gear I 12 and the bevel gear I 5. Then, hold the anti-slip sleeve at the upper end of the handle 42 and push the fixed frame 1 to move. When the traveling wheel 3 rotates, it will drive the bevel gear I 5 to rotate, thereby driving the bevel gear I 12, the sliding rod 11, the shaft rod I 8 and the bevel gear II 9 to rotate. When the bevel gear II 9 rotates, it drives the shaft rod II 19 and the turntable 21 to rotate through the engaged bevel gear II 20. When the turntable 21 rotates, it will drive one end of the driving rod 22 to move back and forth. The other end of the driving rod 22 drives the rack 23 to move back and forth in the sliding sleeve 24, thereby driving the half gear 41 to reciprocate on the upper end of the rack 23, thereby driving the extension rod 40 to drive the rotating rod 35 to reciprocate. When the rotating rod 35 reciprocates, it will drive the mounting plate 37 and the transmitter 38 and the receiving device 39 to swing left and right, increasing the detection area.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A road and bridge defect detector based on ultrasonic rebound, comprising: A fixed frame (1) and a tabletop (26), characterized in that: a fixed plate (2) is fixedly installed on the lower side of the rear end of the fixed frame (1), a traveling wheel (3) is rotatably connected to the inner side of the fixed plate (2), a round rod (4) is fixedly installed between two traveling wheels (3) on one side, and a driving component is arranged on one side of the round rod (4); The tabletop (26) is U-shaped, mounting blocks (27) are fixedly installed on the front and rear sides of the left and right ends of the tabletop (26). When the tabletop (26) is placed on the upper end of the fixed frame (1), the mounting blocks (27) are clamped and fixed by bolts with the upper end and the side end of the fixed frame (1). A processing device (28) is fixedly installed on the upper end of the tabletop (26), a lifting plate (29) is installed on the lower end of the tabletop (26) in a liftable manner, vertical plates (34) are fixedly installed on the front and rear sides of the lower end of the lifting plate (29), a rotating rod (35) is rotatably connected between the two vertical plates (34), one end of the rotating rod (35) passes through one of the vertical plates (34) and is connected with a swinging component, and a mounting plate (37) is fixedly installed at the lower end of the rotating rod (35) through a connecting block (36). A transmitter (38) and a receiving device (39) are fixedly installed at the lower end of the mounting plate (37).

2. The road and bridge defect detector based on ultrasonic rebound according to claim 1, characterized in that: A threaded sleeve (30) is fixedly installed on one side of the upper end of the tabletop (26), and a guide sleeve (31) is fixedly installed on the other side. The lower ends of the threaded sleeve (30) and the guide sleeve (31) pass through the upper and lower side walls of the tabletop (26). A threaded rod (32) is threadedly connected in the threaded sleeve (30). After the lower end of the threaded rod (32) passes through the threaded sleeve (30), it is rotatably connected to one side of the upper end of the lifting plate (29). An anti-slip cap is fixedly installed at the upper end of the threaded rod (32). A guide rod (33) is slidably inserted in the guide sleeve (31). The lower end of the guide rod (33) passes through the guide sleeve (31) and is fixedly connected to the other side of the upper end of the lifting plate (29).

3. The road and bridge defect detector based on ultrasonic rebound according to claim 1, characterized in that: Threaded holes are formed in the side walls of the front, rear, left and right ends of the fixed frame (1). The mounting block (27) is L-shaped. One end of the mounting block (27) is located outside the threaded hole. After the bolt passes through the mounting block (27), it is threadedly connected to the inner wall of the threaded hole.

4. The road and bridge defect detector based on ultrasonic rebound according to claim 1, characterized in that: There are two connecting blocks (36). The lower ends of the two connecting blocks (36) are respectively fixedly installed on the left and right sides of the upper end of the mounting plate (37), and the upper ends of the two connecting blocks (36) are respectively fixed on the side walls on the left and right sides of the rotating rod (35).

5. The road and bridge defect detector based on ultrasonic rebound according to claim 1, wherein: The swinging component includes a rack (23) and a semi-gear (41). An extension rod (40) is fixedly installed at the upper end of the semi-gear (41). The extension rod (40) is fixedly installed on the outer wall of one end of the rotating rod (35). Sliding sleeves (24) are slidably sleeved on the outer walls of the left and right ends of the rack (23). A support rod four (25) is fixedly installed at the upper end of the sliding sleeve (24). The upper end of the support rod four (25) is fixedly installed on the lower side of one end of the lifting plate (29). The outer wall of the semi-gear (41) is meshed with the outer wall of the rack (23).

6. The road and bridge defect detector based on ultrasonic rebound according to claim 1, characterized in that: The driving component includes bevel gear one (5), shaft rod one (8) and shaft rod two (19). Bevel gear one (5) is fixedly installed on the outer wall of one end of the round rod (4). A bearing one (7) is sleeved on the outer wall of shaft rod one (8). A support rod one (6) is fixedly installed on the outer wall of one end of bearing one (7). The other end of support rod one (6) is fixedly installed on the outer wall of the fixed plate (2).

7. An in-situ detector for road and bridge defects based on ultrasonic rebound according to claim 6, characterized in that: A chute (10) is opened at the lower end of shaft rod one (8). A slide rod (11) is slidably connected in chute (10). A bearing two (13) is fixedly sleeved on the outer wall of slide rod (11). A support rod two (14) is fixedly installed on the outer wall of one end of bearing two (13). An electric push rod (15) is fixedly installed at the upper end of support rod two (14). The upper end of electric push rod (15) is fixedly connected to the lower end of support rod one (6).

8. An ultrasonic rebound-based road and bridge defect detector according to claim 7, characterized in that: A turntable (21) is fixedly installed at one end of shaft rod two (19), and a bevel gear two (20) is fixedly installed at the other end. The outer wall of bevel gear two (20) is meshed with the outer wall of bevel gear two (9). A bearing three (18) is fixedly sleeved on the outer wall of shaft rod two (19). A support rod three (17) is fixedly installed on the outer wall of one end of bearing three (18). An ear plate (16) is fixedly installed on the outer wall of the end of support rod three (17) far away from bearing three (18). One end of ear plate (16) is fixed on the outer wall of the fixed plate (2).

9. The road and bridge defect detector based on ultrasonic rebound according to claim 8, wherein: One end of the turntable (21) is rotatably connected to a driving rod (22), and the other end of the driving rod (22) is rotatably connected to the side wall of one end of the rack (23).

10. A road and bridge defect detector based on ultrasonic rebound according to claim 6, characterized in that: A handle (42) is fixedly installed obliquely on one side of the upper end of the fixed frame (1).

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