A road crack detection device

Abstract

The present invention relates to the field of road detection, and in particular to a road crack detection device, comprising a movable base plate, a push handle fixedly arranged on one side of the upper end of the movable base plate, a cleaning assembly fixedly arranged at the front end of the movable base plate, a clearance hole penetrating the center of the movable base plate, side rails fixedly arranged on both sides of the upper end of the clearance hole, a movable seat linearly movably arranged in the side rails, two movable seats fixedly connected by a slide bar, a detection table linearly slidably arranged on the slide bar, a detection rod sleeve arranged in the detection table, a recording brush arranged at the top of the detection table, and the top of the recording brush abutting against the surface of the bottom end of the recording drawing paper. The present invention can synchronously draw a continuous figure matching the direction of the road crack on the recording drawing paper, so that the direction and shape of the crack can be intuitively recorded in real time as the detection process progresses, and the crack width and crack depth inside the road crack can be accurately measured, which is conducive to a comprehensive analysis of the health status of the road.

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 pushing cylinder is fixedly arranged at the upper end of the detection table, the output shaft of the pushing 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, the other end of the connecting rod is rotationally connected to the corresponding tunneling claw, a surveying rod is coaxially and slidably penetrated through the inside of the inner rod sleeve, an electric lifting rod one and an electric lifting rod two are respectively fixedly arranged at the top end of the detection rod sleeve, the output end of the electric lifting rod one is fixedly connected to the top end of the surveying rod and drives the surveying rod to perform axial displacement, and the output end of the electric lifting rod two 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 surveying 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, and 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 on the outer wall of the tunneling claw at equal intervals transversely, and a positioning spiny piece protrudes outwards 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, and 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 paintbrush is fixedly installed on a mounting seat, a mounting sliding cylinder is fixedly arranged at the top end of the detection table, the mounting seat is slidably installed up and down inside the mounting sliding cylinder, and a jacking spring is arranged between the bottom end of the mounting seat and the mounting 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 take-up and pay-off of the recording drawing paper.

[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 push 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 the distance between the inner walls of the gap by the advancing distance of the inner rod sleeve. At the same time, the survey rod is pushed downward by the electric lifter I until the survey rod moves to the bottom of the gap, so that the depth of the gap can be calculated by the advancing distance of the survey rod, 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. 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] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the present invention is a road crack detection device, comprising a movable base plate 1, a push handle 2 is fixedly arranged on one side of the upper end of the movable base plate 1, a cleaning component 3 is fixedly arranged on the front end of the movable base plate 1, a clearance hole 102 is set through the center of the movable base 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 and movably installed in the side rails 101, and the two movable seats 104 are fixedly connected by a sliding rod 105, a detection platform 5 is linearly and slidably installed on the sliding rod 105, a detection rod sleeve 6 is arranged in the detection platform 5, a recording brush 7 is arranged on the top of the detection platform 5, a winding roller 401 and an unwinding roller 402 are rotatably installed on both sides of the movable base plate 1, the winding roller 401 is driven to rotate by a winding motor 403, a recording drawing paper 4 is arranged between the winding roller 401 and the unwinding roller 402, and the top of the recording brush 7 is against the surface of the bottom end of the recording drawing paper 4.

[0034] Specifically, by setting the side rails 101, the moving seat 104, the recording paper 4 and the recording pen 7, when detecting the gap, the moving base plate 1 is moved above the gap to be detected, and the detection rod sleeve 6 is aligned with the gap, and the inside of the gap is surveyed by using the detection rod sleeve 6. After completing the detection of a certain point, the detection platform 5 is driven by the moving seat 104 to move in a straight line along the side rails 101 to perform multi-point detection on the gap. At this time, the detection platform 5 will be able to perform synchronous sliding on the slide bar 105 in a corresponding manner along the direction of the gap. In this process, the recording pen 7 will synchronously draw a continuous graphic matching the direction of the road gap on the recording paper 4 as the detection platform 5 moves horizontally and vertically, so that the direction and shape of the gap can be intuitively recorded in real time during the detection process, which is conducive to a comprehensive analysis of the road gap.

[0035] like 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 reach the inside of the gap smoothly, 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 provided 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 provided between the top of the inner rod sleeve 620 and the baffle 603, a first sensing block 604 is fixedly provided at the bottom of the baffle 603, a first distance sensor 624 is fixedly provided at the bottom of the inner rod sleeve 620, and the first distance sensor 624 is provided opposite to the first sensing block 604.

[0039] Specifically, in the initial state, multiple groups of excavation claws 610 are closed in a cone shape. At this time, the first distance sensor 624 detects the distance between the first sensing block 604 as 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 excavation claws 610 open outward until they are pressed against the inner wall of the gap. At this time, the first distance sensor 624 detects the distance between the first sensing block 604 as the detection value. The difference between the initial value and the detection value can be used to convert and measure the distance between the inner walls of the gap, thereby measuring the gap width.

[0040] like Figure 7 and Figure 8 As shown, a second sensing block 622 is fixedly provided at the top of the inner rod sleeve 620 , a detection head 631 is fixedly provided at the bottom of the survey rod 630 , a second distance sensor 632 is fixedly provided at the top of the detection head 631 , and the second distance sensor 632 is arranged opposite to the second sensing block 622 .

[0041] Specifically, when the excavation claw 610 is opened, the survey rod 630 is pushed downward until the detection head 631 moves to the bottom of the gap. At this time, the second distance sensor 632 is used to detect the moving distance between the second sensing block 622, and the depth of the gap can be converted and measured.

[0042] like Figure 7 As shown, 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.

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

[0044] like Figure 5 As shown, a plurality of earth-breaking blades 611 are arranged horizontally and evenly at intervals on the outer wall of the excavation claw 610, and a positioning thorn piece 612 is protruding outward from the bottom end of the outer wall of the excavation 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 sliding 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 sliding rod 105, so that the recording pen 7 can always stay within the effective area of the recording paper 4 for drawing, avoiding the situation of missing drawing 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, when in 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 a plurality of 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 sliding rod 105 along with the direction of the gap. During this process, the recording pen 7 will synchronously draw a continuous graph matching the direction of the road gap on the recording paper 4 along with the horizontal and vertical movement processes 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 limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to 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 moving bottom plate, and a pusher is fixedly arranged on one side of the upper end of the moving bottom plate, characterized in that, The front end of the movable bottom plate is fixedly provided with a cleaning component, a clearance hole is set through the center of the movable bottom plate, side rails are fixedly provided on both sides of the upper end of the clearance hole, a movable seat is linearly and movably installed in the side rails, and the two movable seats are fixedly connected by a sliding rod, a detection platform is linearly and slidably installed on the sliding rod, a detection rod sleeve is set in the detection platform, a recording brush is set on the top of the detection platform, a winding roller and an unwinding roller are rotatably installed on both sides of the movable bottom plate, the winding roller is driven to rotate by a winding motor, a recording drawing paper is set 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; A fixed screw sleeve is fixedly arranged at the bottom of the detection platform, and the detection rod sleeve thread passes through the fixed screw sleeve, and a pushing cylinder is fixedly arranged at the upper end of the detection platform, and the output shaft of the pushing cylinder is rotatably matched with the top end of the detection rod sleeve, and a plurality of excavation claws are connected to the bottom of the detection rod sleeve in a circumferentially uniform rotation manner, and an inner rod sleeve is coaxially arranged inside the detection rod sleeve, and the bottom of the inner rod sleeve is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the corresponding excavation claw, and a survey rod is coaxially slidably penetrated inside the inner rod sleeve, and an electric lifting rod 1 and an electric lifting rod 2 are respectively fixedly arranged on the top of the detection rod sleeve, and the output end of the electric lifting rod 1 is fixedly connected to the top end of the survey rod and drives the survey rod to perform axial displacement, and the output end of the electric lifting rod 2 is fixedly connected to the top end of the inner rod sleeve and drives the excavation claw to close or open; When the detection rod sleeve moves downward, it will also synchronously engage with the fixed screw sleeve, so that the detection rod sleeve will continue to rotate and advance downward, and the excavation claws will remain in a closed posture to form a cone. At the same time, the excavation claws will rotate and move synchronously with the detection rod sleeve to excavate and crush the soil impurities accumulated inside the gap; The inner rod sleeve will drive multiple groups of excavation claws to open outward through the connecting rod until the excavation claws rest against the inner wall of the gap to achieve clamping and positioning. The distance between the inner walls of the gap can be detected by calculating the advancement distance of the inner rod sleeve. The survey rod is pushed downward by the electric lifting rod until the survey rod moves to the bottom of the gap. The depth of the gap can be detected by calculating the advancement distance of the survey rod.

2. The road crack detection device according to claim 1, wherein, 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. The 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. The 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 inside the detection rod sleeve (6), and the guide rod (605) slidably penetrates through the top end of the inner rod sleeve (620).

5. The road crack detection device according to claim 1, characterized in that, A plurality of soil-breaking blades (611) are arranged at equal intervals in the transverse direction on the outer wall of the tunneling claw (610), and a positioning sprag (612) protrudes outward from the bottom end of the outer wall of the tunneling claw (610).

6. The road crack detection device according to claim 1, characterized in that, The cleaning assembly (3) includes a mounting frame (301), the mounting frame (301) is fixedly installed on the moving bottom plate (1), a cleaning shaft (303) and a secondary shaft (305) are respectively rotatably installed in the mounting frame (301), the cleaning shaft (303) and the secondary shaft (305) are connected by a transmission belt (304), a cleaning motor (302) is fixedly arranged at the top end of the mounting frame (301), 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) rotatably penetrate through the moving bottom plate (1) and are fixedly connected with cleaning brush discs (306).

7. The road crack detection device according to claim 1, characterized in that, The bottom end of the recording pen (7) is fixedly installed on a mounting seat (701), a mounting sliding cylinder (702) is fixedly arranged at the top end of the detection table (5), the mounting seat (701) is slidably mounted up and down in the mounting sliding cylinder (702), and a jacking spring (703) is arranged between the bottom end of the mounting seat (701) and the mounting sliding cylinder (702).

8. A road crack detection device according to claim 1, characterized in that, A screw pair (103) is arranged in one of the side rails (101), a smooth rod is arranged in the other side rail (101), the screw pair (103) is in threaded penetration and cooperation with the corresponding moving seat (104), and the smooth rod is in sliding penetration and cooperation with the corresponding moving seat (104).

9. The road crack detection device according to claim 1, characterized in that, The side rail (101) and the sliding rod (105) are arranged perpendicular to each other, and the moving direction of the moving seat (104) along the straight line of the side rail (101) is parallel to the winding and unwinding movement direction of the recording drawing paper (4).

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

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