Road crack detection device

Abstract

The invention relates to the field of road detection, in particular to a road crack detection device which comprises a movable bottom plate, a pushing handle fixedly arranged on one side of the upper end of the movable bottom plate, a sweeping assembly fixedly arranged at the front end of the movable bottom plate, a receding hole formed in the center of the movable bottom plate in a penetrating mode, and side rails fixedly arranged on the two sides of the upper end of the receding hole. Moving seats are linearly and movably installed in the side rails, the two moving seats are fixedly connected through a sliding rod, a detection table is linearly and slidably installed on the sliding rod, a detection rod sleeve is arranged in the detection table, a recording paintbrush is arranged at the top end of the detection table, and the top end of the recording paintbrush abuts against the surface of the bottom end of the recording drawing paper. According to the method, the continuous graph matched with the road gap trend can be synchronously drawn on the recording drawing paper, so that the trend shape of the gap can be visually recorded in real time in the detection process, the gap width and the gap depth in the road gap can be accurately measured, and comprehensive analysis on the health state of a road is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of road detection, and in particular to a road crack detection device. Background Art

[0002] Cracks are one of the most common, most prone to occur and earliest diseases among all types of road damage. They accompany the entire service life of the road and worsen with the age of the road. Cracks in the road surface not only affect the appearance of the road and the comfort of driving, but also easily expand to cause structural damage to the road surface and shorten the service life of the road surface. Therefore, when cracks appear in the road surface, they should be sealed and repaired in time. Otherwise, rainwater and other debris will enter the surface structure and roadbed along the cracks, resulting in a decrease in the bearing capacity of the road surface and accelerated local or large-scale damage to the road surface.

[0003] At present, in the process of road crack detection, the detection instrument is simply used to detect whether there are cracks on the road surface. When cracks are detected on the road surface, the crack position is marked and then the crack is repaired. This simple detection method can only detect whether there are cracks, but cannot detect the shape, width and depth of the cracks, which is not conducive to analyzing the health of the road. Summary of the invention

[0004] The purpose of the present invention is to provide a road crack detection device to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A road crack detection device comprises a movable base plate, a push handle is fixedly provided on one side of the upper end of the movable base plate, a cleaning component is fixedly provided on the front end of the movable base plate, a clearance hole is penetrated through the center of the movable base plate, side rails are fixedly provided on both sides of the upper end of the clearance hole, a movable seat is linearly movably installed in the side rails, two movable seats are fixedly connected by a sliding rod, a detection platform is linearly slidably installed on the sliding rod, a detection rod sleeve is provided in the detection platform, a recording brush is provided on the top of the detection platform, a winding roller and an unwinding roller are rotatably installed on both sides of the movable base plate, the winding roller is driven to rotate by a winding motor, a recording drawing paper is provided between the winding roller and the unwinding roller, and the top of the recording brush is against the surface of the bottom end of the recording drawing paper.

[0007] A fixed screw sleeve is fixedly arranged at the bottom of the detection table. The detection rod sleeve is threadedly penetrated through the fixed screw sleeve. A pressing cylinder is fixedly arranged at the upper end of the detection table. The output shaft of the pressing cylinder is rotationally matched with the top end of the detection rod sleeve. A plurality of tunneling claws are circumferentially and evenly rotatably connected to the bottom of the detection rod sleeve. An inner rod sleeve is coaxially arranged inside the detection rod sleeve. One end of a connecting rod is rotationally connected to the bottom of the inner rod sleeve, and the other end of the connecting rod is rotationally connected to the corresponding tunneling claw. A survey rod is coaxially and slidably penetrated through the inside of the inner rod sleeve. Electric lifting rods I and II are respectively fixedly arranged at the top end of the detection rod sleeve. The output end of the electric lifting rod I is fixedly connected to the top end of the survey rod and drives the survey rod to perform axial displacement. The output end of the electric lifting rod II is fixedly connected to the top end of the inner rod sleeve and drives the tunneling claws to close or open.

[0008] As a further scheme of the present invention: A baffle is fixedly arranged on the inner wall of the detection rod sleeve. The inner rod sleeve slidably penetrates through the baffle. A return spring is arranged between the top end of the inner rod sleeve and the baffle. A first induction block is fixedly arranged at the bottom of the baffle. A first distance sensor is fixedly arranged at the bottom of the inner rod sleeve, and the first distance sensor is arranged facing the first induction block.

[0009] As a further scheme of the present invention: A second induction block is fixedly arranged at the top inside the inner rod sleeve. A detection head is fixedly arranged at the bottom of the survey rod. A second distance sensor is fixedly arranged at the top of the detection head, and the second distance sensor is arranged facing the second induction block.

[0010] As a further scheme of the present invention: A guide rod is fixedly arranged between the baffle and the top inside the detection rod sleeve. The guide rod slidably penetrates through the top end of the inner rod sleeve.

[0011] As a further scheme of the present invention: A plurality of soil-breaking blades are arranged horizontally and at equal intervals on the outer wall of the tunneling claw. A positioning spiny piece protrudes outward at the bottom end of the outer wall of the tunneling claw.

[0012] As a further scheme of the present invention: The cleaning assembly includes a mounting frame. The mounting frame is fixedly installed on the moving bottom plate. A cleaning shaft and a secondary shaft are respectively rotatably installed inside the mounting frame. The cleaning shaft and the secondary shaft are connected by a transmission belt. A cleaning motor is fixedly arranged at the top end of the mounting frame. The output end of the cleaning motor is connected to the cleaning shaft. The bottom ends of the cleaning shaft and the secondary shaft both rotatably penetrate through the moving bottom plate and are fixedly connected with cleaning brush discs.

[0013] As a further scheme of the present invention: The bottom end of the recording brush pen is fixedly installed on a mounting seat. An installation sliding cylinder is fixedly arranged at the top end of the detection table. The mounting seat is slidably installed up and down inside the installation sliding cylinder. A jacking spring is arranged between the bottom end of the mounting seat and the installation sliding cylinder.

[0014] As a further solution of the present invention: a screw pair is arranged in one of the side rails, a smooth rod is arranged in the other side rail, the screw pair is in threaded through fit with the corresponding moving seat, and the smooth rod is in sliding through fit with the corresponding moving seat.

[0015] As a further solution of the present invention: the side rail and the sliding rod are arranged perpendicular to each other, and the moving direction of the moving seat along the straight line of the side rail is parallel to the moving direction of the recording drawing paper for winding and unwinding.

[0016] As a further solution of the present invention: the width of the recording drawing paper is greater than the length of the sliding rod.

[0017] Advantages of the present invention:

[0018] (1) By providing the side rail, the moving seat, the recording drawing paper and the recording pen, during the gap detection, the moving seat will drive the detection table to move linearly along the side rail to perform multi-point detection on the gap. As the detection table moves horizontally and vertically, the recording pen will synchronously draw a continuous graph on the recording drawing paper that matches the trend of the road gap, so that the trend shape of the gap can be intuitively recorded in real time during the detection process, which is beneficial to comprehensively analyze the road gap.

[0019] (2) By providing the detection rod sleeve, when performing internal detection on a certain point of the road gap, first align the detection rod sleeve with the gap, and then push the detection rod sleeve downward through the pushing cylinder, so that the detection rod sleeve continuously rotates and advances downward. During this process, the tunneling claws rotate and move synchronously with the detection rod sleeve, so that the soil impurities accumulated inside the gap can be excavated and broken, enabling the detection rod sleeve to smoothly reach the inside of the gap, effectively improving the accuracy of the internal detection of the gap.

[0020] (3) When the detection rod sleeve extends into the gap, the detection rod sleeve stops rotating and advancing. The inner rod sleeve is pushed downward by the electric lifter II, and the inner rod sleeve will drive multiple groups of tunneling claws to open outward through the connecting rod until the tunneling claws abut against the inner wall of the gap to achieve clamping and positioning. This can not only limit and support the inner wall of the gap during the detection process to ensure stability, but also calculate and detect the distance between the inner walls of the gap through the advancing distance of the inner rod sleeve. At the same time, the surveying rod is pushed downward by the electric lifter I until the surveying rod moves to the bottom of the gap, so that the depth of the gap can be calculated and detected through the advancing distance of the surveying rod. Furthermore, the width and depth of the gap inside the road gap can be accurately measured, which is beneficial to comprehensively analyze the health status of the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a bottom view schematic diagram of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the movable bottom plate in the present invention.

[0025] Figure 4 It is a structural schematic diagram of the cleaning component in the present invention.

[0026] Figure 5 It is a structural schematic diagram of the detection platform in the present invention.

[0027] Figure 6 It is a structural schematic diagram of the detection rod sleeve in the present invention.

[0028] Figure 7 It is a schematic diagram of the internal structure of the detection rod sleeve in the present invention.

[0029] Figure 8 It is a structural schematic diagram of the excavation claw in the present invention.

[0030] Figure 9 It is a structural schematic diagram of the recording brush in the present invention.

[0031] In the figure: 1. movable bottom plate; 101. side rail; 102. clearance hole; 103. screw pair; 104. movable seat; 105. slide bar; 2. push handle; 3. cleaning assembly; 301. mounting frame; 302. cleaning motor; 303. cleaning shaft; 304. transmission belt; 305. secondary shaft; 306. cleaning brush plate; 4. recording paper; 401. winding roller; 402. unwinding roller; 403. winding motor; 5. testing table; 501. fixing screw sleeve; 502. pushing cylinder; 6. testing rod sleeve; 601 , electric lifting rod one; 602, electric lifting rod two; 603, baffle; 604, first sensing block; 605, guide rod; 610, excavation claw; 611, earth-breaking blade; 612, positioning thorn piece; 620, inner rod sleeve; 621, return spring; 622, second sensing block; 623, connecting rod; 624, first distance sensor; 630, survey rod; 631, detection head; 632, second distance sensor; 7, recording brush; 701, mounting seat; 702, mounting slide; 703, lifting spring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, the present invention is a road crack detection device, including a moving bottom plate 1. On one side of the upper end of the moving bottom plate 1, a pusher 2 is fixedly arranged. At the front end of the moving bottom plate 1, a cleaning component 3 is fixedly arranged. A through hole 102 is formed through the center of the moving bottom plate 1. On both sides of the upper end of the through hole 102, side rails 101 are fixedly arranged. A moving seat 104 is linearly movably installed in the side rails 101. The two moving seats 104 are fixedly connected by a sliding rod 105. A detection table 5 is linearly slidably installed on the sliding rod 105. A detection rod sleeve 6 is arranged inside the detection table 5. A recording pen 7 is arranged at the top end of the detection table 5. On both sides of the moving bottom plate 1, a winding roller 401 and a unwinding roller 402 are respectively rotatably installed. The winding roller 401 is driven to rotate by a winding motor 403. A recording paper 4 is arranged between the winding roller 401 and the unwinding roller 402. The top end of the recording pen 7 abuts against the bottom surface of the recording paper 4.

[0034] Specifically, by setting the side rails 101, the moving seats 104, the recording paper 4 and the recording pen 7, during crack detection, the moving bottom plate 1 is moved above the crack to be detected, and the detection rod sleeve 6 is aligned with the crack. The inside of the crack is surveyed by using the detection rod sleeve 6. When the detection of a certain point is completed, the detection table 5 is driven by the moving seat 104 to linearly move along the side rails 101 to perform multi-point detection of the crack. At this time, the detection table 5 can synchronously slide adaptively on the sliding rod 105 along the trend of the crack. During this process, the recording pen 7 will synchronously draw a continuous graph on the recording paper 4 that matches the trend of the road crack as the detection table 5 moves horizontally and vertically. Thus, the trend shape of the crack can be intuitively recorded in real time during the detection process, which is beneficial to comprehensively analyze the road crack.

[0035] Such as Figure 5 、 Figure 6 and Figure 7As shown in the figure, a fixed screw sleeve 501 is fixedly arranged at the bottom of the detection table 5. The detection rod sleeve 6 is threadedly penetrated through the fixed screw sleeve 501. A push cylinder 502 is fixedly arranged at the upper end of the detection table 5. The output shaft of the push cylinder 502 is rotationally matched with the top end of the detection rod sleeve 6. A plurality of tunneling claws 610 are circumferentially and evenly rotatably connected to the bottom of the detection rod sleeve 6. An inner rod sleeve 620 is coaxially arranged inside the detection rod sleeve 6. One end of a connecting rod 623 is rotatably connected to the bottom of the inner rod sleeve 620, and the other end of the connecting rod 623 is rotatably connected to the corresponding tunneling claw 610. A survey rod 630 is coaxially and slidably penetrated through the inner rod sleeve 620. An electric lifting rod one 601 and an electric lifting rod two 602 are respectively fixedly arranged at the top end of the detection rod sleeve 6. The output end of the electric lifting rod one 601 is fixedly connected to the top end of the survey rod 630 and drives the survey rod 630 to perform axial displacement. The output end of the electric lifting rod two 602 is fixedly connected to the top end of the inner rod sleeve 620 and drives the tunneling claws 610 to close or open.

[0036] Specifically, by setting the detection rod sleeve 6, when performing internal detection on a certain point of the road gap, first align the detection rod sleeve 6 with the gap, and then push the detection rod sleeve 6 downward through the push cylinder 502. Since the output shaft of the push cylinder 502 is rotationally matched with the detection rod sleeve 6, during the downward movement of the detection rod sleeve 6, it will also be threadedly engaged with the fixed screw sleeve 501 synchronously, so that the detection rod sleeve 6 continuously rotates and advances downward. During this process, the tunneling claws 610 remain in a closed posture to form a cone, and at the same time, the tunneling claws 610 rotate and move synchronously with the detection rod sleeve 6, so that the soil impurities accumulated inside the gap can be excavated and broken, enabling the detection rod sleeve 6 to smoothly reach the inside of the gap, effectively improving the accuracy of the internal detection of the gap.

[0037] More specifically, as Figure 8 shown in the figure, when the detection rod sleeve 6 extends into the gap, the detection rod sleeve 6 stops rotating and advancing. Use the electric lifting two to push the inner rod sleeve 620 downward. The inner rod sleeve 620 will drive a plurality of tunneling claws 610 to open outward through the connecting rod 623 until the tunneling claws 610 abut against the inner wall of the gap to achieve clamping and positioning. It can not only limit and support the inner wall of the gap during the detection process to ensure stability, but also calculate and detect the distance between the inner walls of the gap through the advancing distance of the inner rod sleeve 620. At the same time, use the electric lifting rod one 601 to push the survey rod 630 downward until the survey rod 630 moves to the bottom of the gap, so that the depth of the gap can be calculated and detected through the advancing distance of the survey rod 630, and then the width and depth of the road gap can be accurately measured, which is beneficial to comprehensively analyze the health status of the road.

[0038] As Figure 7As shown, a baffle 603 is fixedly arranged on the inner wall of the detection rod sleeve 6. The inner rod sleeve 620 slides through the baffle 603. A return spring 621 is arranged between the top end of the inner rod sleeve 620 and the baffle 603. A first induction block 604 is fixedly arranged at the bottom of the baffle 603. A first distance sensor 624 is fixedly arranged at the bottom of the inner rod sleeve 620, and the first distance sensor 624 is arranged facing the first induction block 604.

[0039] Specifically, in the initial state, multiple tunneling claws 610 are closed in a conical shape. At this time, the distance detected by the first distance sensor 624 from the first induction block 604 is the initial value. When the inner rod sleeve 620 is pushed downward, the return spring 621 is compressed and deformed to buffer the pushing pressure. At the same time, the tunneling claws 610 open outward until they abut against the inner wall of the gap. At this time, the distance detected by the first distance sensor 624 from the first induction block 604 is the detection value. By using the difference between the initial value and the detection value, the distance between the inner walls of the gap can be measured through conversion, thereby measuring the gap width.

[0040] As Figure 7 and Figure 8 shown, a second induction block 622 is fixedly arranged at the top inside the inner rod sleeve 620. A detection head 631 is fixedly arranged at the bottom of the surveying rod 630. A second distance sensor 632 is fixedly arranged at the top of the detection head 631, and the second distance sensor 632 is arranged facing the second induction block 622.

[0041] Specifically, after the tunneling claws 610 open, the surveying rod 630 is pushed downward until the detection head 631 moves to the bottom of the gap. At this time, by using the moving distance detected by the second distance sensor 632 from the second induction block 622, the depth of the gap can be measured through conversion.

[0042] As Figure 7 shown, a guide rod 605 is fixedly arranged between the baffle 603 and the top inside the detection rod sleeve 6. The guide rod 605 slides through the top end of the inner rod sleeve 620.

[0043] Specifically, during the lifting and lowering process of the detection rod sleeve 6, it will always slide up and down along the guide rod 605. The guide rod 605 is used to limit and guide the moving process of the detection rod sleeve 6, effectively ensuring the stability of the detection rod sleeve 6 during movement.

[0044] As Figure 5 shown, a number of soil-breaking blades 611 are arranged horizontally and at equal intervals on the outer wall of the tunneling claw 610. A positioning spiny piece 612 protrudes outward at the bottom end of the outer wall of the tunneling claw 610.

[0045] Specifically, by providing the earth-breaking blade 611, the excavation claw 610 can improve the excavation and crushing effect of the soil through the earth-breaking blade 611 as the detection rod sleeve 6 is rotated downward, so that the detection rod sleeve 6 can be smoothly rotated downward; by providing the positioning spike piece 612, when the excavation claw 610 is opened outward, the contact and compression between the positioning spike piece 612 and the inner wall of the gap is utilized, so that the excavation claw 610 can be firmly clamped between the inner walls of the gap, thereby improving the stability of the positioning support.

[0046] like Figure 4 As shown, the cleaning component 3 includes a mounting frame 301, which is fixedly mounted on the movable base plate 1, and a cleaning shaft 303 and a secondary shaft 305 are rotatably mounted in the mounting frame 301, and the cleaning shaft 303 and the secondary shaft 305 are connected by a transmission belt 304. A cleaning motor 302 is fixedly arranged on the top of the mounting frame 301, and the output end of the cleaning motor 302 is connected to the cleaning shaft 303. The bottom ends of the cleaning shaft 303 and the secondary shaft 305 both rotate and penetrate the movable base plate 1 and are fixedly connected with a cleaning brush disc 306.

[0047] Specifically, by setting up the cleaning component 3, when the mobile base plate 1 is pushed along the road, the cleaning motor 302 will drive the cleaning shaft 303 to rotate, and the cleaning shaft 303 will drive the secondary shaft 305 to rotate synchronously through the transmission belt 304, so that the two sets of cleaning brush discs 306 can scrape and clean the road surface, thereby keeping the road surface to be surveyed clean and tidy, which is beneficial to the measurement process.

[0048] like Figure 9 As shown, the bottom end of the recording brush 7 is fixedly mounted on the mounting seat 701, a mounting slide 702 is fixedly provided on the top of the detection platform 5, the mounting seat 701 is slidably installed in the mounting slide 702 up and down, and a lifting spring 703 is provided between the bottom end of the mounting seat 701 and the mounting slide 702.

[0049] Specifically, under the elastic force of the lifting spring 703, the mounting seat 701 will always push the recording brush 7 upward, so that the recording brush 7 can always maintain abutment contact with the recording paper 4, which is beneficial to the drawing and recording process.

[0050] like Figure 3 As shown, a screw pair 103 is disposed in one of the side rails 101 , and a polished rod is disposed in the other side rail 101 . The screw pair 103 is threadedly engaged with the corresponding moving seat 104 , and the polished rod is slidably engaged with the corresponding moving seat 104 .

[0051] Furthermore, the side rails 101 and the slide bar 105 are arranged perpendicular to each other, and the linear moving direction of the movable seat 104 along the side rails 101 is parallel to the reeling and unreeling moving direction of the recording paper 4 .

[0052] Specifically, in this embodiment, the linear movement of the moving seat 104 is realized by the screw pair 103. When the moving seat 104 is in threaded engagement with the screw pair 103, it will always slide linearly along the optical rod. At the same time, the moving seat 104 can slide freely on the slide rod 105, so that the moving seat 104 can drive the detection table 5 to move adaptively along the gap direction.

[0053] Furthermore, the width of the recording paper 4 is greater than the length of the slide rod 105, so that the recording pen 7 can always stay within the effective area of the recording paper 4 for tracing, avoiding the situation of missed tracing caused by the recording pen 7 moving outside the recording paper 4.

[0054] The working principle of the present invention is as follows Figures 1-9 As shown in the figure, during use, the surveyor pushes the moving bottom plate 1 to move on the road surface to be surveyed through the pusher 2 until the detection table 5 is moved directly above the road gap and the detection rod sleeve 6 is aligned with the gap. Subsequently, the detection rod sleeve 6 is pushed downward by the push cylinder 502, so that the detection rod sleeve 6 continuously rotates and advances downward. During this process, the tunneling claws 610 remain in a closed posture to form a cone, and at the same time, the tunneling claws 610 rotate and move synchronously with the detection rod sleeve 6, so that the soil impurities accumulated inside the gap can be excavated and broken, enabling the detection rod sleeve 6 to smoothly reach the inside of the gap. When the detection rod sleeve 6 extends into the gap, the detection rod sleeve 6 stops advancing. The inner rod sleeve 620 is pushed downward by the electric lifter II, and the inner rod sleeve 620 will drive multiple groups of tunneling claws 610 to open outward through the connecting rod 623 until the tunneling claws 610 abut against the inner wall of the gap to achieve clamping and positioning. This can not only limit and support the inner wall of the gap during the detection process to ensure stability, but also calculate and detect the distance between the inner walls of the gap through the advancing distance of the inner rod sleeve 620. At the same time, the surveying rod 630 is pushed downward by the electric lifting rod I 601 until the surveying rod 630 moves to the bottom of the gap, so that the depth of the gap can be calculated and detected through the advancing distance of the surveying rod 630. Furthermore, the width and depth of the road gap can be accurately measured, which is beneficial to comprehensively analyze the health status of the road. When the detection of a certain point is completed, the detection table 5 is driven by the moving seat 104 to move linearly along the side rail 101 to detect multiple points of the gap. At this time, the detection table 5 can slide synchronously on the slide rod 105 adaptively along the gap direction. During this process, the recording pen 7 will synchronously trace a continuous graph on the recording paper 4 that matches the road gap direction during the horizontal and vertical movement of the detection table 5, so that the shape of the gap direction can be intuitively recorded in real time during the detection process.

[0055] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made in accordance with the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A road crack detection device, comprising a movable base plate (1), a push handle (2) being fixedly provided on one side of the upper end of the movable base plate (1), characterized in that: A cleaning assembly (3) is fixedly arranged at the front end of the movable bottom plate (1); a clearance hole (102) is provided through the center of the movable bottom plate (1); side rails (101) are fixedly arranged on both sides of the upper end of the clearance hole (102); a movable seat (104) is linearly movably installed in the side rails (101); the two movable seats (104) are fixedly connected by a sliding rod (105); a detection table (5) is linearly slidably installed on the sliding rod (105); a detection rod sleeve (6) is provided in the detection table (5); a recording brush (7) is provided at the top of the detection table (5); a winding roller (401) and an unwinding roller (402) are rotatably installed on both sides of the movable bottom plate (1); the winding roller (401) is driven to rotate by a winding motor (403); a recording drawing paper (4) is provided between the winding roller (401) and the unwinding roller (402); the top end of the recording brush (7) abuts against the surface of the bottom end of the recording drawing paper (4); A fixing screw sleeve (501) is fixedly arranged at the bottom of the detection platform (5), and the detection rod sleeve (6) is threadedly penetrated through the fixing screw sleeve (501). A pushing cylinder (502) is fixedly arranged at the upper end of the detection platform (5), and the output shaft of the pushing cylinder (502) is rotatably matched with the top end of the detection rod sleeve (6). The bottom of the detection rod sleeve (6) is connected to a plurality of excavation claws (610) for uniform circumferential rotation. An inner rod sleeve (620) is coaxially arranged inside the detection rod sleeve (6), and the bottom of the inner rod sleeve (620) is rotatably connected to one end of a connecting rod (623). The connecting rod (6 23) The other end is rotatably connected to the corresponding excavation claw (610), and a survey rod (630) is coaxially slidably arranged inside the inner rod sleeve (620). The top of the detection rod sleeve (6) is respectively fixedly provided with an electric lifting rod 1 (601) and an electric lifting rod 2 (602). The output end of the electric lifting rod 1 (601) is fixedly connected to the top of the survey rod (630) and drives the survey rod (630) to perform axial displacement, and the output end of the electric lifting rod 2 (602) is fixedly connected to the top of the inner rod sleeve (620) and drives the excavation claw (610) to close or open.

2. A road crack detection device according to claim 1, characterized in that: A baffle (603) is fixedly arranged on the inner wall of the detection rod sleeve (6), the inner rod sleeve (620) slides through the baffle (603), a return spring (621) is arranged between the top of the inner rod sleeve (620) and the baffle (603), a first sensing block (604) is fixedly arranged at the bottom of the baffle (603), a first distance sensor (624) is fixedly arranged at the bottom of the inner rod sleeve (620), and the first distance sensor (624) is arranged opposite to the first sensing block (604).

3. A road crack detection device according to claim 2, characterized in that: A second sensing block (622) is fixedly arranged at the top of the inner rod sleeve (620), a detection head (631) is fixedly arranged at the bottom of the survey rod (630), a second distance sensor (632) is fixedly arranged at the top of the detection head (631), and the second distance sensor (632) is arranged opposite to the second sensing block (622).

4. A road crack detection device according to claim 2, characterized in that: A guide rod (605) is fixedly arranged between the baffle (603) and the top of the detection rod sleeve (6), and the guide rod (605) slides through the top of the inner rod sleeve (620).

5. A road crack detection device according to claim 1, characterized in that: A plurality of earth-breaking blades (611) are arranged at equal intervals in a transverse direction on the outer wall of the excavation claw (610), and a positioning spine (612) is provided at the bottom end of the outer wall of the excavation claw (610) protruding outwards.

6. A road crack detection device according to claim 1, characterized in that: The cleaning component (3) comprises a mounting frame (301), wherein the mounting frame (301) is fixedly mounted on the movable base plate (1), wherein a cleaning shaft (303) and a secondary shaft (305) are rotatably mounted in the mounting frame (301), wherein the cleaning shaft (303) and the secondary shaft (305) are connected via a transmission belt (304), wherein a cleaning motor (302) is fixedly arranged at the top end of the mounting frame (301), wherein the output end of the cleaning motor (302) is connected to the cleaning shaft (303), and the bottom ends of the cleaning shaft (303) and the secondary shaft (305) are both rotatably penetrated through the movable base plate (1) and are fixedly connected to a cleaning brush disc (306).

7. A road crack detection device according to claim 1, characterized in that: The bottom end of the recording brush (7) is fixedly mounted on the mounting seat (701), the top end of the detection platform (5) is fixedly provided with a mounting slide (702), the mounting seat (701) is slidably mounted up and down in the mounting slide (702), and a lifting spring (703) is provided between the bottom end of the mounting seat (701) and the mounting slide (702).

8. A road crack detection device according to claim 1, characterized in that: A screw pair (103) is disposed in one of the side rails (101), and a polished rod is disposed in the other side rail (101); the screw pair (103) and the corresponding movable seat (104) are threadedly engaged, and the polished rod and the corresponding movable seat (104) are slidably engaged.

9. A road crack detection device according to claim 1, characterized in that: The side rail (101) and the slide bar (105) are arranged perpendicular to each other, and the linear movement direction of the movable seat (104) along the side rail (101) is parallel to the reeling and unreeling movement direction of the recording paper (4).

10. A road crack detection device according to claim 9, characterized in that: The width of the recording paper (4) is greater than the length of the sliding rod (105).

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