Road surface levelness detection device and detection method

Abstract

The application relates to the technical field of road construction, in particular to a road surface levelness detection device and a detection method. The device comprises a supporting assembly and a detection unit. The supporting assembly comprises a lifting mechanism fixed on a walking vehicle. One end of the lifting mechanism is fixedly connected with a lifting support. The other end of the lifting support is fixedly connected with a fixed plate. Two rows of detection units are arranged on the lower surface of the fixed plate. A detection wheel is arranged on the bottom of the detection unit and can slide up and down. The width of the detection wheel is half of the width of the detection unit and is arranged in the middle of the bottom of the detection unit. The two rows of detection units are staggered by half the width of the detection unit. A marking tube is arranged in the detection unit and can slide out from the bottom. The detection wheel is in sliding cooperation with the marking tube. The detection wheel slides up and down in the detection unit and drives the marking tube to mark the recessed or protruding position. A connecting assembly is arranged on the side surface of the detection unit. The device can adapt to different width road surfaces for detection and realize comprehensive coverage detection without omission.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a road surface levelness detection device and detection method. Background Technology

[0002] In road engineering, the quality of highways is constantly improving. The condition of highways directly affects driving speed, safety, and transportation costs. High-grade highways with well-constructed road surfaces can ensure high-speed, safe, and comfortable driving, and can relatively save transportation costs, thus fully realizing the function of high-grade highways. Therefore, it is essential to check whether there are bumps or depressions on the highway.

[0003] Existing levelness detection devices have a wide gap between the detection wheels, which leads to omissions in the detection range and makes it impossible to conduct a comprehensive inspection of the road surface. In addition, the width of each road section varies, and the existing detection device is not designed to take this into account. Instead, the detection device is designed with a fixed width structure, which makes it impossible to inspect the road surface at once, resulting in low detection efficiency. Summary of the Invention

[0004] This invention provides a road surface levelness detection device and method to solve the problems existing in the prior art.

[0005] One aspect of this invention provides a road surface levelness detection device, including a support assembly and a detection unit. The support assembly includes a lifting mechanism fixed to a traveling vehicle. The lifting mechanism is fixedly connected to one end of a lifting bracket, and a fixing plate is fixedly connected to the other end of the lifting bracket. Two rows of detection units are arranged on the lower surface of the fixing plate. Detection wheels are slidably arranged at the bottom of each detection unit. The width of the detection wheels is half the width of the detection unit and is centrally located at the bottom of the detection unit. The two rows of detection units are staggered by half the width of the detection unit. A marking tube that can slide out from the bottom is provided in each detection unit. The detection wheels and marking tubes slide in cooperation. During the detection process, when the detection wheels travel to a depression or protrusion on the road surface, the detection wheels slide up and down in the detection unit, thereby driving the marking tube to mark the depression or protrusion. A connecting assembly is provided on the side of the detection unit for splicing detection units to adjust the detection width of the two rows of detection units.

[0006] Optionally, the lifting mechanism includes a fixed box fixed on the traveling vehicle, two threaded rods are arranged in parallel and rotatably in the fixed box, the top of the threaded rods protrudes upward through the fixed box, a lifting plate is screwed onto the threaded rod, the lifting plate is fixedly connected to the lifting bracket, and a drive mechanism is provided in the fixed box, which is connected to the threaded rods for transmission.

[0007] Optionally, the drive mechanism includes a lifting motor coaxially connected to one of the threaded rods, with lifting sprockets on both threaded rods and a lifting chain between the lifting sprockets.

[0008] Optionally, a detection slider is slidably arranged inside the detection unit, and a detection wheel is rotatably arranged at the bottom of the detection slider. The upper part of the two opposite sides of the detection slider is inclined. A push rod is hinged inside the detection unit and above the inclined surface. A push spring is connected between the push rods and below the hinge point. A push wheel is provided at the lower end of the push rod, and the push wheel abuts against the corresponding inclined surface. A pressing slider is provided at the top of the push rod. A pressing connecting rod is horizontally arranged at the top of the marking tube. A pressing groove is horizontally arranged on the pressing connecting rod, and the pressing slider passes through the pressing groove.

[0009] Optionally, a limit block is provided on the side of the detection slider, and the limit block is located in a slot opened in the detection unit.

[0010] Optionally, a pigment box is provided above the marking tube in the detection unit. The pigment box has an opening that communicates with the outside. A connecting hose connects the pigment box and the marking tube. A pigment outlet is provided at the bottom of the marking tube. A sleeve support is provided inside the marking tube. A push rod sleeve is provided on the sleeve support, which is opposite to the pigment outlet. A stop push rod passes through the push rod sleeve. A stop spring is connected between the top of the stop push rod and the push rod sleeve. An outlet stop is provided at the bottom of the stop push rod, which is adapted to the pigment outlet.

[0011] Optionally, the connecting components include front and rear positioning blocks and left and right positioning blocks. The front and rear positioning blocks and the left and right positioning blocks are respectively set on two adjacent vertical sides of the detection unit. The front and rear positioning blocks are inverted L-shaped, and the two front and rear positioning blocks are set on the side of the detection unit with their long sides flush with the vertical edge of the detection unit. The left and right positioning blocks are T-shaped and centrally set on the side of the detection unit. The long sides of the two front and rear positioning blocks are joined together to form a left and right positioning block. The other two vertical sides of the detection unit are provided with snap-fit ​​mechanisms that are adapted to the left and right positioning blocks. For two adjacent detection units in the same row, they are fixed by inserting the left and right positioning blocks in one detection unit into the snap-fit ​​mechanism in the other detection unit. For two rows of detection units, they are staggered and fixed by connecting the two front and rear positioning blocks on two adjacent detection units in one row and inserting them into the snap-fit ​​mechanism in one detection unit in the other row.

[0012] Optionally, the locking mechanism includes a positioning groove adapted to the left and right positioning blocks. A U-shaped locking block is arranged inside the detection unit opposite to the upper side of the positioning groove. The first end of the locking block slides into the positioning groove, and a locking block spring is arranged between the middle of the locking block and the detection unit. An inverted cone-shaped locking block pusher is arranged above the second end of the locking block, and the second end of the locking block abuts against the cone surface of the locking block pusher. A button that slides upward through the detection unit is arranged on the locking block pusher, and a button spring is arranged on the button and located between the detection unit and the locking block pusher.

[0013] Another aspect of the present invention provides a method for detecting road surface levelness, implemented using the aforementioned road surface levelness detection device, comprising:

[0014] The width of the two rows of detection units is adjusted according to the width of the road to be inspected;

[0015] The height of the detection unit is adjusted by using a lifting mechanism and a lifting bracket, so that the detection wheels partially retract into the detection unit after contacting the road to be detected;

[0016] The vehicle is started to move the detection unit. The detection wheels roll on the road to be inspected. When there are bumps or depressions on the road surface, the detection wheels move up and down with the undulations of the road surface, thereby driving the marking tube to mark the depressions or bumps.

[0017] The marked position is leveled and re-inspected. After the inspection is completed, the inspection unit is raised using a lifting mechanism and disassembled.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the width of the two rows of detection units can be freely adjusted by the connecting components to match the width of the road so as to carry out comprehensive detection of the road surface; and the width of the detection wheel is half the width of the detection unit and is centrally located at the bottom of the detection unit. Therefore, when the two rows of detection units are staggered, the detection wheel can fully cover the road to be detected without any omissions. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. In the drawings:

[0020] Figure 1 This is a three-dimensional structural diagram of a road surface levelness detection device provided in an embodiment of the present invention;

[0021] Figure 2 This is a side view structural diagram of a road surface levelness detection device provided in an embodiment of the present invention;

[0022] Figure 3 This is a front view structural diagram of a road surface levelness detection device provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a fixing box provided in an embodiment of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of a first angle detection unit provided in an embodiment of the present invention;

[0025] Figure 6 This is a three-dimensional structural schematic diagram of a second angle detection unit provided in an embodiment of the present invention;

[0026] Figure 7 This is a cross-sectional structural diagram of a detection unit provided in an embodiment of the present invention;

[0027] Figure 8 for Figure 7 A magnified view of the structure at point A in the middle;

[0028] Figure 9 This is a schematic diagram of the structure of a marking tube provided in an embodiment of the present invention;

[0029] Figure 10 This is a top sectional view of a snap-fit ​​mechanism provided in an embodiment of the present invention;

[0030] Figure 11 This is a rear cross-sectional view of a snap-fit ​​mechanism provided in an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of a front and rear positioning block splicing structure provided in an embodiment of the present invention.

[0032] Among them, 1. Support assembly, 101. Fixing box, 102. Threaded rod, 103. Lifting plate, 104. Lifting bracket, 105. Fixing plate, 106. Lifting sprocket, 107. Lifting chain, 108. Lifting motor; 2. Detection unit, 201. Detection wheel, 202. Detection slider, 203. Limit block, 204. Push wheel, 205. Push rod, 206. Pressing slider, 207. Pressing groove, 208. Pressing connecting rod, 209. Push spring, 2 10. Marking groove; 3. Marking tube; 301. Connecting hose; 302. Paint box; 303. Paint outlet; 304. Outlet stop; 305. Stop push rod; 306. Stop spring; 307. Push rod sleeve; 308. Sleeve bracket; 309. Paint box opening; 401. Front and rear positioning blocks; 402. Left and right positioning blocks; 403. Button; 404. Positioning groove; 405. Locking block; 406. Locking block spring; 407. Locking block push block; 408. Button spring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0034] See Figures 1-12 This invention provides a road surface levelness detection device, comprising a support assembly 1 and a detection unit 2. The support assembly 1 includes a lifting mechanism fixed to a traveling vehicle. The lifting mechanism is fixedly connected to one end of a lifting bracket 104, and the other end of the lifting bracket 104 is fixedly connected to a fixing plate 105. Two rows of detection units 2 are arranged on the lower surface of the fixing plate 105. Detection wheels 201 are slidably arranged at the bottom of each detection unit 2. The width of the detection wheels 201 is half the width of the detection unit 2 and is centrally located at the bottom of the detection unit 2. The two rows of detection units 2 are staggered by half the width of the detection unit 2. A marking tube 3 that can slide out from the bottom is provided in each detection unit 2. The detection wheels 201 and the marking tube 3 slide together. During the detection process, when the detection wheels 201 travel to a depression or protrusion on the road surface, the detection wheels 201 slide up and down in the detection unit 2, thereby driving the marking tube 3 to mark the depression or protrusion. A connecting assembly is provided on the side of each detection unit 2. The connecting assembly is used to splice the detection units 2 to adjust the detection width of the two rows of detection units 2.

[0035] In practice, a certain number of two rows of detection units 2 can be directly fixed side by side under the fixed plate 105 as basic detection units. The four detection units 2 at the outermost edge of the basic detection units and the remaining detection units 2 used for splicing and adjusting the detection width are designed with connecting components.

[0036] The lifting mechanism includes a fixed box 101 fixed on the traveling vehicle. Two threaded rods 102 are arranged in parallel and rotatably in the fixed box 101. The top of the threaded rods 102 extends upward through the fixed box 101. A lifting plate 103 is screwed onto the threaded rods 102. The lifting plate 103 is fixedly connected to the lifting bracket 104. A drive mechanism is provided inside the fixed box 101. The drive mechanism is connected to the threaded rods 102 in a transmission manner.

[0037] The drive mechanism includes a lifting motor 108 coaxially connected to one of the threaded rods 102, and lifting sprockets 106 are provided on both threaded rods 102, with a lifting chain 107 provided between the lifting sprockets 106.

[0038] A detection slider 202 is slidably disposed within the detection unit 2. A detection wheel 201 is rotatably disposed at the bottom of the detection slider 202. The upper parts of the two opposite sides of the detection slider 202 are inclined surfaces. A push rod 205 is hinged within the detection unit 2 and located above the inclined surface. A push spring 209 is connected between the push rods 205 and located below the hinge point. A push wheel 204 is disposed at the lower end of the push rod 205 and abuts against the corresponding inclined surface. A pressing slider 206 is disposed at the top end of the push rod 205. The marking tube 3 can slide out of the detection unit 2 through the marking groove 210 located on one side of the inclined surface within the detection unit 2. A pressing connecting rod 208 is horizontally disposed at the top end of the marking tube 3. A horizontally disposed... There is a downward sliding groove 207, and the downward sliding block 206 passes through the downward sliding groove 207. When it reaches the depression position of the road surface, the detection wheel 201 moves downward. Under the action of the push spring 209, the two push rods 205 move together with their lower parts and swing outward with their upper parts around the hinge point. At the same time, the downward sliding block 206 presses down the downward connecting rod 208, thereby driving the marking tube 3 to move downward and contact the road surface for marking. Similarly, when it reaches the convex position, the detection wheel 201 moves upward. The push rods 205 swing away from each other with their lower parts and move inward with their upper parts around the hinge point. At the same time, the downward sliding block 206 presses down the downward connecting rod 208, thereby driving the marking tube 3 to move downward and contact the road surface for marking.

[0039] A limiting block 203 is provided on the side of the detection slider 202 and the limiting block 203 is located in a slot opened in the detection unit 2.

[0040] Inside the detection unit 2, above the marking tube 3, is a pigment box 302. The pigment box 302 has an opening 309 that communicates with the outside. A connecting hose 301 connects the pigment box 302 and the marking tube 3. The bottom end of the marking tube 3 has a pigment outlet 303. Inside the marking tube 3 is a sleeve support 308. On the sleeve support 308 is a push rod sleeve 307 opposite to the pigment outlet 303. A stop push rod 305 passes through the push rod sleeve 307. The top of the stop push rod 305... A stop spring 306 is connected to the push rod sleeve 307. The bottom end of the stop push rod 305 is provided with an outlet stop 304 that is adapted to the pigment outlet 303. During the detection process, under the action of the spring force of the stop spring 306, the outlet stop 304 is inserted into the pigment outlet 303 to close the pigment outlet 303. When a road surface protrusion or depression is detected, the marking tube 3 contacts the road surface downward. During the contact process, the outlet stop 304 is pushed upward, and the pigment outlet 303 is opened to mark the road surface.

[0041] The connecting components include front and rear positioning blocks 401 and left and right positioning blocks 402. The front and rear positioning blocks 401 and the left and right positioning blocks 402 are respectively set on two adjacent vertical sides of the detection unit 2. The front and rear positioning blocks 401 are inverted L-shaped, and the two front and rear positioning blocks 401 are set on the side of the detection unit 2 with their long sides flush with the vertical edge of the detection unit. The left and right positioning blocks 402 are T-shaped and are set in the center on the side of the detection unit 2. The long sides of the two front and rear positioning blocks 401 are joined together to form a left and right positioning block 402. The other two vertical sides of the detection unit 2 are provided with snap-fit ​​mechanisms that are adapted to the left and right positioning blocks 402. For two adjacent detection units 2 in the same row, they are fixed by inserting the left and right positioning blocks 402 in one detection unit 2 into the snap-fit ​​mechanism in the other detection unit 2. For two rows of detection units 2, they are staggered and fixed by connecting two front and rear positioning blocks 401 on two adjacent detection units 2 in one row and inserting them into the snap-fit ​​mechanism in one detection unit 2 in the other row.

[0042] The locking mechanism includes a positioning groove 404 adapted to the left and right positioning blocks 402. A U-shaped locking block 405 is disposed inside the detection unit 2 opposite to the upper side of the positioning groove 404. The first end of the locking block 405 slides into the positioning groove 404, and a locking spring 406 is disposed between the middle of the locking block 405 and the detection unit 2. A locking push block 407 in the shape of an inverted cone is disposed above the second end of the locking block 405, and the second end of the locking block 405 abuts against the conical surface of the locking push block 407. A button is provided on the locking push block 407 to slide upwards and pass through the detection unit 2. 403. A button spring 408 is provided on the button 403 and located between the detection unit 2 and the locking block pusher 407. In practice, the positioning groove 404 is T-shaped. After the button 403 is pressed down, the locking block 405 is pushed to both sides by the conical surface in the locking block pusher 407. The first end of the locking block 405 retracts into the detection unit 2. After the splicing between the two detection units 2 is completed, the button 403 is released and the locking block 405 is reset. The first end of the locking block 405 is locked on the upper surface of the left and right positioning blocks 402 or the front and rear positioning blocks 401 to complete the fixation.

[0043] In practice, when using the aforementioned road levelness detection device to detect road levelness, the following steps are included:

[0044] Step 1: Adjust the width of the two rows of detection units 2 according to the width of the road to be inspected.

[0045] Select an appropriate number of detection units 2 according to the width of the road to be inspected. Align the two positioning slots 404 on one detection unit 2 with the front and rear positioning blocks 401 spliced ​​together in the previous row and the left and right positioning blocks 402 in this row, and slide them upwards. This will cause the front and rear positioning blocks 401 and the left and right positioning blocks 402 spliced ​​together to be inserted into the positioning slots 404 and locked by the locking blocks 405. Since the width of the detection wheel 201 is half the width of the detection unit 2, the two rows of detection units 2 are staggered by half the width of the detection unit 2 to ensure that the spliced ​​two rows of detection units 2 can perform a comprehensive inspection of the road surface without overlap or omission.

[0046] Step 2: Use the lifting mechanism to adjust the height of the detection unit 2 via the lifting bracket 104, so that the detection wheel 201 partially retracts into the detection unit 2 after contacting the road to be detected.

[0047] Start the lifting motor 108, which drives the threaded rod 102 to rotate. The threaded rod 102 drives the lifting sprocket 106 to rotate. Under the action of the lifting sprocket 106 and the lifting chain 107, the two threaded rods 102 rotate synchronously, thereby driving the lifting plate 103 to move. The lifting plate 103 drives the lifting bracket 104 to move, thereby driving the detection unit 2 downward through the fixed plate 105. When the detection wheel 201 contacts the road surface and partially retracts into the detection unit 2, the lifting motor 108 stops. Specifically, a mark can be set on the threaded rod 102. When the lifting plate 103 moves to the marked position, the lifting motor 108 can be stopped.

[0048] Step 3: Start the vehicle to move the detection unit 2. The detection wheel 201 rolls on the road to be inspected. When there are bumps or depressions on the road surface, the detection wheel 201 moves up and down with the undulations of the road surface, thereby driving the marking tube 3 to mark the depressions or bumps.

[0049] As the detection wheel 201 changes with the undulation of the road surface, the detection wheel 201 drives the detection slider 202 to slide up and down. The sliding of the detection slider 202 causes the push wheel 204 to roll on the inclined surface, thereby causing the push rod 205 to tilt. The push rod 205 drives the downward slider 206 to move. The downward slider 206 slides in the downward sliding groove 207, thereby causing the downward connecting rod 208 to move down. The downward movement of the downward connecting rod 208 causes the marking tube 3 to move down. The spring 209 keeps the two push rods 205 taut, so that the detection slider 202 is always subjected to a downward thrust.

[0050] When the marking tube 3 is lowered and contacts the road surface, the outlet block 304 is pressed and moves upward. The outlet block 304 drives the block push rod 305 to move, and the block push rod 305 compresses the block spring 306. At this time, the pigment outlet 303 is opened, and the pigment flows through the pigment box 302 through the connecting hose 301 into the marking tube 3, and then flows out from the pigment outlet 303 to mark the raised or recessed positions.

[0051] Step 4: Level the marked position and re-inspect. After the inspection is completed, use the lifting mechanism to raise the inspection unit 2 and disassemble the inspection unit 2.

[0052] During disassembly, press both buttons 403 on one detection unit simultaneously. Buttons 403 move the locking block pusher 407 while stretching the button spring 408. The locking block pusher 407 pushes the second end of the locking block 405, causing the two locking blocks 405 to move away from each other. The first end of the locking block 405 retracts into the detection unit 2 while compressing the locking block spring 406. At this point, the detection unit 2 can be slid downwards to disengage the positioning groove 404 from the front and rear positioning blocks 401 and the left and right positioning blocks 402, and the detection unit 2 can be removed.

[0053] The solution provided by this invention allows the width of the two rows of detection units to be freely adjusted to match the road width through the connecting components, so as to carry out comprehensive road surface detection; and the width of the detection wheel is half the width of the detection unit and is centrally located at the bottom of the detection unit. Therefore, when the two rows of detection units are staggered, the detection wheel can fully cover the road to be detected without any omissions.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A road surface levelness detection device, comprising a support assembly and a detection unit, characterized in that, The support assembly includes a lifting mechanism fixed on the vehicle. The lifting mechanism is fixedly connected to one end of the lifting bracket, and a fixing plate is fixedly connected to the other end of the lifting bracket. Two rows of detection units are provided on the lower surface of the fixing plate. The detection unit has a sliding detection wheel at its bottom, half the width of the detection unit, centered at the bottom. Two rows of detection units are staggered by half a unit width. A marking tube extends from the bottom of the detection unit, sliding between the detection wheel and the marking tube. During detection, when the detection wheel reaches a depression or protrusion on the road surface, it slides up and down within the unit, causing the marking tube to move and mark the depression or protrusion. A connecting component is located on the side of the detection unit, used to connect detection units and adjust the detection width between rows. The connecting components include front and rear positioning blocks and left and right positioning blocks. The front and rear positioning blocks and the left and right positioning blocks are respectively set on two adjacent vertical sides of the detection unit. The front and rear positioning blocks are inverted L-shaped, and the two front and rear positioning blocks are set on the side of the detection unit with their long sides flush with the vertical edge of the detection unit. The left and right positioning blocks are T-shaped and centrally set on the side of the detection unit. The long sides of the two front and rear positioning blocks are joined together to form a left and right positioning block. The other two vertical sides of the detection unit are provided with snap-fit ​​mechanisms that are adapted to the left and right positioning blocks. For two adjacent detection units in the same row, they are fixed by inserting the left and right positioning blocks in one detection unit into the snap-fit ​​mechanism in the other detection unit. For two rows of detection units, they are staggered and fixed by mating the two front and rear positioning blocks on two adjacent detection units in one row and inserting them into the snap-fit ​​mechanism in one detection unit in the other row.

2. The road surface levelness detection device as described in claim 1, characterized in that, The lifting mechanism includes a fixed box fixed on the traveling vehicle. Two threaded rods are arranged in parallel and rotatably in the fixed box. The top of the threaded rods extends upward through the fixed box. A lifting plate is screwed onto the threaded rod. The lifting plate is fixedly connected to the lifting bracket. A drive mechanism is set inside the fixed box. The drive mechanism is connected to the threaded rods for transmission.

3. The road surface levelness detection device as described in claim 1, characterized in that, The drive mechanism includes a lifting motor that is coaxially connected to one of the threaded rods. Both threaded rods are equipped with lifting sprockets, and a lifting chain is installed between the lifting sprockets.

4. The road surface levelness detection device as described in claim 1, characterized in that, A detection slider is slidably installed inside the detection unit. A detection wheel is rotatably installed at the bottom of the detection slider. The upper part of the two opposite sides of the detection slider is inclined. A push rod is hinged inside the detection unit and above the inclined surface. A push spring is connected between the push rods and below the hinge point. A push wheel is installed at the lower end of the push rod. The push wheel abuts against the corresponding inclined surface. A pressing slider is installed at the top of the push rod. A pressing connecting rod is horizontally installed at the top of the marking tube. A pressing groove is horizontally installed on the pressing connecting rod. The pressing slider passes through the pressing groove.

5. The road surface levelness detection device as described in claim 4, characterized in that, A limit block is provided on the side of the detection slider, and the limit block is set in a slot opened in the detection unit.

6. The road surface levelness detection device as described in claim 1, characterized in that, Inside the detection unit, above the marking tube, is a pigment box with an opening that connects to the outside. A connecting hose connects the pigment box to the marking tube. At the bottom of the marking tube is a pigment outlet. Inside the marking tube is a sleeve support with a push rod sleeve opposite the pigment outlet. A stop push rod passes through the push rod sleeve. A stop spring connects the top of the stop push rod to the push rod sleeve. At the bottom of the stop push rod is an outlet stop that matches the pigment outlet.

7. The road surface levelness detection device as described in claim 1, characterized in that, The locking mechanism includes a positioning groove that fits the left and right positioning blocks. A U-shaped locking block is arranged inside the detection unit opposite to the upper side of the positioning groove. The first end of the locking block slides into the positioning groove, and a locking block spring is arranged between the middle of the locking block and the detection unit. A locking block pusher in the shape of an inverted cone is arranged above the second end of the locking block, and the second end of the locking block abuts against the cone surface of the locking block pusher. A button that slides upward through the detection unit is arranged on the locking block pusher, and a button spring is arranged on the button and located between the detection unit and the locking block pusher.

8. A method for detecting road surface levelness, using the road surface levelness detection device according to any one of claims 1-7, characterized in that, include: The width of the two rows of detection units is adjusted according to the width of the road to be inspected; The height of the detection unit is adjusted by using a lifting mechanism and a lifting bracket, so that the detection wheels partially retract into the detection unit after contacting the road to be detected; The vehicle is started to move the detection unit. The detection wheels roll on the road to be inspected. When there are bumps or depressions on the road surface, the detection wheels move up and down with the undulations of the road surface, thereby driving the marking tube to mark the depressions or bumps. The marked position is leveled and re-inspected. After the inspection is completed, the inspection unit is raised using a lifting mechanism and disassembled.

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