Flatness measuring device for highway asphalt pavement maintenance

Abstract

The invention belongs to the technical field of pavement flatness measurement, and particularly relates to a flatness measuring device for highway asphalt pavement maintenance, which comprises a measuring frame, the side wall of the measuring frame is fixedly connected with a controller, and the inner wall of the upper side of the measuring frame is fixedly connected with a lead screw linear module. The moving end of the lead screw linear module is fixedly connected with a moving plate. When the flatness of the asphalt pavement is detected in a snowy day, accumulated snow in a detection area can be automatically removed, so that the problems that the accumulated snow reflects laser beam energy, so that the intensity of echo signals is unstable, the accumulated snow is not uniformly distributed, and the accuracy of a measurement result is influenced are solved; and in the process that a traction vehicle drags the measuring device to measure the road surface flatness, after the vehicle runs to the uneven area of the road surface to cause vibration, the vibration caused by the vehicle can be compensated, and the accuracy of the measuring result of the device is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of road surface smoothness measurement, and in particular relates to a smoothness measuring device for highway asphalt pavement maintenance. Background Art

[0002] Smoothness is an important indicator of pavement construction quality and service level. Uneven pavement increases driving resistance and causes additional vibration in vehicles. This vibration can cause bumpy driving, affecting driving speed and safety, driving stability, and passenger comfort. The vibration also exerts impact force on the pavement, exacerbating damage to the pavement and vehicles, as well as tire wear. Uneven pavement can accumulate rainwater, accelerating pavement damage. Therefore, the detection and assessment of smoothness is a very important part of highway construction and maintenance. For example, Patent Publication No. CN114894129A proposes a smoothness measurement device for highway asphalt pavement maintenance.

[0003] When using a flatness measuring device to detect asphalt pavement, surrounding environmental factors will affect the measurement results. Taking the snow-covered road scene as an example, when using a laser sensor for flatness detection, the snow surface will reflect part of the laser beam energy, causing the echo signal intensity to be unstable, which in turn causes fluctuations in the ranging data. At the same time, the uneven distribution of snow layer thickness will lead to significant differences in the height data of different measuring points, causing the measuring device to mistakenly judge that the road surface is uneven, ultimately affecting the accuracy of the measurement results.

[0004] Therefore, a flatness measuring device for highway asphalt pavement maintenance is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a smoothness measuring device for maintaining asphalt pavement of a highway in order to solve the above problems.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a device for measuring the smoothness of a highway asphalt pavement maintenance, comprising a measuring frame, a controller fixedly connected to the side wall of the measuring frame, a lead screw linear module fixedly connected to the upper inner wall of the measuring frame, a movable plate fixedly connected to the movable plate, and a laser rangefinder fixedly connected to the lower side wall of the movable plate, and further comprising: A high-pressure air pump is fixedly connected to the front side wall of the measuring frame, the air outlet of the high-pressure air pump is fixedly connected to a horizontal pipe, the wall of the horizontal pipe is fixedly connected to a hose, the rear end of the hose passes through the measuring frame and is fixedly connected to a snow clearing assembly; The knocking component is connected to the snow clearing component and is used to knock the snow to compact it, thereby improving the snow clearing efficiency; The vibration compensation component is arranged on the front side wall of the measuring frame and is used to compensate for the measurement error caused by the vibration of the vehicle.

[0007] Preferably, the snow clearing assembly includes two guide rods fixedly connected to the inner wall of the measuring frame, and guide sleeves are slidably provided on the outside of the two guide rods, and the side walls on the opposite sides of the two guide sleeves are fixedly connected to the same insert through a bracket, and a snow blowing pipe is inserted in the insert, and the lower end of the snow blowing pipe is tilted toward the rear, and the upper end of the snow blowing pipe is fixedly connected to a bent pipe, and the rear end of the bent pipe is fixedly connected to the rear end of the hose, the side wall of the insert is fixedly connected to a pulling cylinder, and the lower side wall of the movable plate is fixedly connected to a small electric push rod, and the moving end of the small electric push rod is fixedly connected to a pulling block that matches the pulling cylinder.

[0008] Preferably, the rear inner wall of the measuring frame is fixedly connected to a guide roller via a multi-stage elastic telescopic rod, and the hose passes through the guide roller.

[0009] Preferably, the knocking assembly includes a knocking frame fixedly connected to the rear side wall of the insertion tube, the side wall of the knocking frame is rotatably connected to a rotating rod, through holes are opened on the left and right sides of the measuring frame, the rear end of the rotating rod is connected to the through hole on the right side through a gear rack transmission mechanism, the rod wall fixed sleeve of the rotating rod is provided with a cam shaft, the rear side wall of the insertion tube is fixedly connected to a support frame, the rear end of the support frame is fixedly connected to a lifting cylinder, a lifting rod is movably inserted in the lifting cylinder, the upper end of the lifting rod is fixedly connected to a lifting plate, the lifting plate and the lifting cylinder are fixedly connected with the same spring, and the lower end of the lifting rod is fixedly connected to a knocking plate.

[0010] Preferably, the vibration compensation assembly includes a compensation cylinder fixedly connected to the front side wall of the measuring frame, the lower inner wall of the compensation cylinder is connected to a counterweight plate via a spring, the upper side wall of the counterweight plate is fixedly connected to a conductive frame, the conductive frame is electrically connected to the power supply of the traction vehicle via a conductive slide mechanism, the interior of the compensation cylinder is embedded with a resistor plate that is in sliding contact with the conductive frame, and the lower end of the resistor plate is electrically connected to the controller via a current sensor.

[0011] Preferably, the left side wall of the measuring frame is fixedly connected to two cylinders through a bracket, the inner wall of the cylinder is rotatably connected to a round rod, the rod wall of the round rod is fixedly connected to a vertical rod, and the lower side walls of the two cylinders are provided with sliding openings that match the vertical rods. The lower end of the vertical rod at the rear side extends out of the sliding opening and is fixedly connected to a laser generator, and the lower end of the vertical rod at the front side extends out of the sliding opening and is fixedly connected to an indicator plate. A plurality of laser receivers are fixedly connected to the side of the indicator plate close to the laser generator, and the plurality of laser receivers are electrically connected to the controller.

[0012] Preferably, the left and right sides of the measuring frame are fixedly connected with square tubes with tapered openings on the lower sides, the two ends of the horizontal tube are fixedly connected to the front side walls of the two square tubes respectively, two first control valves are provided in the horizontal tube, a second control valve is provided in the hose, and a boosting pipe is fixedly connected to the upper side wall of the horizontal tube, the rear end of the boosting pipe is connected to the measuring frame, and a third control valve is provided in the boosting pipe.

[0013] Preferably, the side wall of the measuring frame is fixedly connected to a visual sensor electrically connected to the controller, the side wall of the movable plate is fixedly connected to an adjusting electric push rod through a bracket, the moving end of the adjusting electric push rod is fixedly connected to an adjusting motor, and the output end of the adjusting motor is fixedly connected to a condenser.

[0014] Compared with existing technologies, the advantages of a flatness measuring device for highway asphalt pavement maintenance are: 1. Through the snow-clearing component and the knocking component, when testing the flatness of the asphalt road surface on snowy days, the snow in the detection area can be automatically cleared, thereby avoiding the problem of snow reflecting the laser beam energy, resulting in unstable echo signal strength and uneven snow distribution, which affects the accuracy of the measurement results.

[0015] 2. Through the vibration compensation component, when the towing vehicle traction measurement device is measuring the road surface flatness, if the vehicle drives into an uneven area on the road surface and causes vibration, the vibration caused by the vehicle can be compensated, further improving the accuracy of the device's measurement results.

[0016] 3. Through the laser generator, indicator board, laser receiver, square tube, first control valve, second control valve, boost pipe and third control valve, when the measuring device is used to measure the road surface flatness, when the weather is foggy and hazy, high-pressure wind walls can be formed on both sides of the measuring device to avoid the influence of fog and haze on the accuracy of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a device for measuring the smoothness of an asphalt pavement for highway maintenance provided by the present invention; Figure 2 The present invention provides a device for measuring the smoothness of asphalt pavement for highway maintenance. Figure 1 Left side cross-sectional view; Figure 3 This is a schematic structural diagram of a snow-clearing component and a knocking component in a smoothness measuring device for maintaining an asphalt road surface provided by the present invention; Figure 4 This is a schematic diagram of the positional relationship between a snowblowing pipe and a curved pipe in a device for measuring the smoothness of an asphalt pavement for maintenance of a highway provided by the present invention; Figure 5This is a schematic structural diagram of a vibration compensation component in a smoothness measuring device for maintaining an asphalt road surface provided by the present invention; Figure 6 This is a schematic diagram of the positional relationship between a laser generator and a laser receiver in a device for measuring the smoothness of an asphalt pavement for maintenance of a highway provided by the present invention; Figure 7 The present invention provides a schematic diagram of the positional relationship of a condenser in a device for measuring the smoothness of an asphalt pavement for maintenance of a highway.

[0018] In the figure: 1 measuring frame, 2 controller, 3 screw linear module, 4 moving plate, 5 laser rangefinder, 6 high pressure air pump, 7 horizontal pipe, 8 hose, 9 snow clearing assembly, 91 guide rod, 92 guide sleeve, 10 insert cylinder, 11 snow blowing pipe, 12 elbow, 13 pulling cylinder, 14 small electric push rod, 15 pulling block, 16 guide roller, 17 knocking assembly, 171 knocking frame, 172 rotating rod, 18 through port, 19 camshaft, 20 support frame, 21 lifting rod, 2 2 lifting plate, 23 knocking plate, 24 vibration compensation component, 241 compensation cylinder, 242 counterweight plate, 25 conductive frame, 26 resistance plate, 27 cylinder, 28 round rod, 29 vertical rod, 30 laser generator, 31 indicator plate, 32 laser receiver, 33 square tube, 34 first control valve, 35 second control valve, 36 boosting pipe, 37 third control valve, 38 visual sensor, 39 adjusting electric push rod, 40 adjusting motor, 41 focusing cover, 42 lifting cylinder. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figure 1-Figure 7 As shown, a device for measuring the smoothness of asphalt pavement maintenance on a highway comprises a measuring frame 1, a controller 2 being fixedly connected to the side wall of the measuring frame 1, a screw linear module 3 being fixedly connected to the upper inner wall of the measuring frame 1, a movable plate 4 being fixedly connected to the movable plate 4, and a laser rangefinder 5 being fixedly connected to the lower side wall of the movable plate 4, and further comprising: The high-pressure air pump 6 is fixedly connected to the front side wall of the measuring frame 1. The air outlet of the high-pressure air pump 6 is fixedly connected to a horizontal pipe 7. The wall of the horizontal pipe 7 is fixedly connected to a hose 8. The rear end of the hose 8 passes through the measuring frame 1 and is fixedly connected to a snow-clearing assembly 9. The snow-clearing assembly 9 includes two guide rods 91 fixedly connected to the inner wall of the measuring frame 1. The two guide rods 91 are both slidably sleeved with guide sleeves 92. The side walls of the two guide sleeves 92 on the opposite side are fixedly connected to the same insert 10 through a bracket. A snow-blowing pipe 11 is inserted into the insert 10. The snow-blowing pipe 11 is The lower end is tilted and arranged toward the rear. The upper end of the snowblowing pipe 11 is fixedly connected with a bend pipe 12. The rear end of the bend pipe 12 is fixedly connected with the rear end of the hose 8. The inner wall of the rear side of the measuring frame 1 is fixedly connected with a guide roller 16 through a multi-stage elastic telescopic rod. The hose 8 passes through the guide roller 16. The side wall of the inserting tube 10 is fixedly connected with a pulling tube 13. The lower side wall of the movable plate 4 is fixedly connected with a small electric push rod 14. The moving end of the small electric push rod 14 is fixedly connected with a pulling block 15 that matches the pulling tube 13, which can automatically clear the snow in the detection area. The knocking assembly 17 is connected to the snow-clearing assembly 9 and is used for knocking compacted snow, thereby improving the cleaning efficiency of snow. The knocking assembly 17 includes a knocking frame 171 fixedly connected to the rear side wall of the insert cylinder 10, and the side wall of the knocking frame 171 is rotatably connected to a rotating rod 172. Through holes 18 are opened on the left and right sides of the measuring frame 1, and the rear end of the rotating rod 172 is transmission-connected to the through hole 18 on the right side through a gear rack transmission mechanism. The rod wall fixed sleeve of the rotating rod 172 is provided with a cam shaft 19, and the rear side wall of the insert cylinder 10 is fixedly connected to the support frame 20, and the rear end of the support frame 20 is fixedly connected to the lifting cylinder 42, and a lifting rod 21 is movably inserted in the lifting cylinder 42. The upper end of the lifting rod 21 is fixedly connected to a lifting plate 22, and the lifting plate 22 and the lifting cylinder 42 are fixedly connected with the same spring. The lower end of the lifting rod 21 is fixedly connected to a knocking plate 23, which can break the snow after the wheel is pressed, making subsequent cleaning convenient; A vibration compensation component 24 is provided on the front side wall of the measuring frame 1 and is used to compensate for the measurement error caused by the vibration of the vehicle. The vibration compensation component 24 includes a compensation cylinder 241 fixedly connected to the front side wall of the measuring frame 1. The lower inner wall of the compensation cylinder 241 is connected to a counterweight plate 242 through a spring. The upper side wall of the counterweight plate 242 is fixedly connected to a conductive frame 25. The conductive frame 25 is electrically connected to the power supply of the traction vehicle through a conductive slide mechanism. The interior of the compensation cylinder 241 is embedded with a resistor plate 26 that is in sliding contact with the conductive frame 25. The lower end of the resistor plate 26 is electrically connected to the controller 2 through a current sensor. When the traction vehicle traction measurement device measures the flatness of the road surface, if the vehicle drives into an uneven area on the road surface and causes vibration, the vibration caused by the vehicle can be compensated, thereby further improving the accuracy of the measurement results of the device.

[0021] The left side wall of the measuring frame 1 is fixedly connected to two cylinders 27 through a bracket. The inner wall of the cylinder 27 is rotatably connected to a round rod 28, and the rod wall of the round rod 28 is fixedly connected to a vertical rod 29. The lower side walls of the two cylinders 27 are provided with sliding openings that match the vertical rod 29. The lower end of the vertical rod 29 on the rear side extends out of the sliding opening and is fixedly connected to a laser generator 30. The lower end of the vertical rod 29 on the front side extends out of the sliding opening and is fixedly connected to an indicator plate 31. A plurality of laser receivers 32 are fixedly connected to the side of the indicator plate 31 close to the laser generator 30. The plurality of laser receivers 32 are all electrically connected to the controller 2 and can detect outdoor haze conditions and the inclination angle of the road surface.

[0022] The left and right sides of the measuring frame 1 are fixedly connected with square tubes 33 with tapered openings on the lower side. The two ends of the cross tube 7 are fixedly connected to the front side walls of the two square tubes 33 respectively. Two first control valves 34 are provided in the cross tube 7, and a second control valve 35 is provided in the hose 8. A boost pipe 36 is fixedly connected to the upper side wall of the cross tube 7. The rear end of the boost pipe 36 is connected to the measuring frame 1, and a third control valve 37 is provided in the boost pipe 36. In the process of measuring the flatness of the road surface using the measuring device, when the weather is foggy and hazy, high-pressure wind walls can be formed on both sides of the measuring device to avoid the influence of fog and haze on the accuracy of the measuring device.

[0023] The side wall of the measuring frame 1 is fixedly connected to a visual sensor 38 electrically connected to the controller 2, and the side wall of the movable plate 4 is fixedly connected to an adjusting electric push rod 39 through a bracket. The movable end of the adjusting electric push rod 39 is fixedly connected to an adjusting motor 40, and the output end of the adjusting motor 40 is fixedly connected to a focusing cover 41, which can avoid the problem of diffuse reflection of the laser beam caused by exposed or loose asphalt pavement aggregate, thereby affecting the reflection intensity of the laser beam.

[0024] The operating principle of the present invention is now explained as follows: the measuring frame 1 is installed on the traction vehicle through the traction frame above the measuring frame 1, and the circuit on the measuring frame 1 is connected to the circuit on the traction vehicle. When it is necessary to measure the flatness of the asphalt road surface, the traction vehicle drives the measuring frame 1 to slowly move to the road surface to be measured. When there is snow on the road surface to be measured, the traction vehicle drives the measuring device to a measuring point. Then the operator controls the traction vehicle to stay at the measuring point, and then transmits an electrical signal to the controller 2 through the electric control switch in the vehicle. After receiving the electrical signal, the controller 2 will control the screw linear module 3 to work, and the screw linear module 3 will drive the moving plate 4, the small electric push rod 14 and the pulling block 15 together Move, so that the pulling block 15 moves to the top of the pulling cylinder 13, then, the controller 2 controls the small electric push rod 14 to work, so that the small electric push rod 14 drives the pulling block 15 to be inserted into the pulling cylinder 13, then the controller 2 controls the high-pressure air pump 6 and the second control valve 35 to work, and controls the screw linear module 3 to work, the screw linear module 3 will drive the moving plate 4, the small electric push rod 14, the pulling block 15, the pulling cylinder 13, the insert 10 and the snowblowing pipe 11 to move backward together, the insert 10 will drive the guide sleeve 92 to move together (the friction between the guide sleeve 92 and the guide rod 91 can keep the insert 10 at the set position when the snowblowing pipe 11 is not working), and in the process of the insert 10 moving, the insert 10 will move together with the knocking frame 171. During the movement, the knocking frame 171 drives the rotating rod 172 to move through the gear rack transmission mechanism (the gear rack transmission mechanism includes a transmission gear and a transmission rack, the transmission gear and the rear end of the rotating rod 172 are fixedly connected, and the transmission rack is connected to the lower side wall of the right side through the opening 18. When the knocking frame 171 drives the rotating rod 172 to move, the mutual engagement of the transmission gear and the transmission rack will drive the rotating rod 172 and the cam shaft 19 to rotate), control the rotation of the rotating rod 172 and the cam shaft 19. After the raised part of the cam shaft 19 rotates to the bottom, it will squeeze the lifting plate 22 below. The lifting plate 22 drives the knocking plate 23 to move downward through the lifting rod 21, and knocks the compacted snow layer below, which is convenient for For subsequent cleaning, the high-pressure air pump 6 will transport the compressed gas through the hose 8 to the bent pipe 12 and the snowblowing pipe 11, and discharge it through the snowblowing pipe 11. The snowblowing pipe 11 uses high-pressure airflow to clean the snow that has been knocked below, exposing the road surface. When the snowblowing pipe 11 moves to the rearmost side, the screw linear module 3 will drive the insert cylinder 10 and the snowblowing pipe 11 to move forward to the initial position, and control the pulling block 15 to be pulled out from the pulling cylinder 13, and fix the insert cylinder 10 through the mutual cooperation of the friction between the guide rod 91 and the guide sleeve 92. Then the controller 2 controls the laser rangefinder 5 and the screw linear module 3 to work, and uses the screw linear module 3 to drive the laser rangefinder 5 to move, so as to detect the flatness of the cleaned road surface; When the towing vehicle drives the measuring device onto an inclined road surface, the measuring frame 1 drives the two cylinders 27 to rotate together by a certain angle, and the rotation angle is the same as the inclination angle of the road surface. In the initial state, the centers of the two cylinders 27 are in the same straight line, and the laser signal emitted by the laser generator 30 is received by the laser receiver 32 in the middle position. When the measuring frame 1 tilts due to the inclination of the road surface, the centers of the two cylinders 27 are no longer in the same straight line. For example, when the measuring frame 1 is lower in front and higher in the rear due to the road surface, the measuring frame 1 drives the front cylinder 27 to move downward by a certain angle, and the rear cylinder 27 to move upward by a certain angle. The rear cylinder 27 drives the laser generator 30 to move upward by a corresponding height via the vertical rod 29, so that the laser signal emitted by the laser generator 30 is received by the laser receiver 32 closer to the top. The greater the inclination angle of the road surface, the laser signal will be received by the laser receiver 32 closer to the top, thereby determining the degree of inclination of the road surface. When the outdoor haze is heavy, the laser signal emitted by the laser generator 30 will be blocked by the haze, and the laser signal intensity received by the laser receiver 32 will be weakened. After the controller 2 detects this situation, the controller 2 will control the high-pressure air pump 6 to work, and control the first control valves 34 on both sides and the third control valve 37 in the middle to open. The high-pressure air pump 6 will transport the high-pressure gas through the horizontal pipe 7 to the square tubes 33 on both sides, and discharge it through the tapered port on the lower side of the square tube 33, thereby forming a high-pressure wind wall on both sides of the through port 18 to clear the haze on both sides, and at the same time, it can also clear the pebbles on the road surface to prevent haze from entering the measuring frame 1, and the gas will also be transported to the measuring frame 1 through the booster pipe 36 to increase the air pressure in the measuring frame 1 to prevent haze from entering the measuring frame 1 and affecting the measurement accuracy of the laser rangefinder 5. When the measuring device is working, after the controller 2 detects that the asphalt pavement aggregate is exposed or loose through the visual sensor 38, the controller 2 will control the adjustment motor 40 to work, and the adjustment motor 40 drives the focus cover 41 to rotate one hundred and eighty degrees, so that the focus cover 41 moves to the bottom of the laser rangefinder 5. Then, the controller 2 controls the adjustment electric push rod 39 to work, and the adjustment electric push rod 39 will drive the focus cover 41 to move upward, so that the focus cover 41 is mounted on the outside of the laser rangefinder 5. When the laser beam emitted by the laser rangefinder 5 is irradiated on the aggregate and diffusely reflected, the diffusely reflected light signal can be reflected and converged to the receiving end of the laser rangefinder 5, thereby avoiding the problem that the intensity of the laser echo signal is weakened due to the diffuse reflection of the aggregate, thereby affecting the measurement accuracy.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring the smoothness of a highway asphalt pavement maintenance, comprising a measuring frame (1), a controller (2) fixedly connected to the side wall of the measuring frame (1), a screw linear module (3) fixedly connected to the upper inner wall of the measuring frame (1), a movable plate (4) fixedly connected to the movable plate (4), and a laser rangefinder (5) fixedly connected to the lower side wall of the movable plate (4), characterized in that: Also includes: A high-pressure air pump (6) is fixedly connected to the front side wall of the measuring frame (1); the air outlet end of the high-pressure air pump (6) is fixedly connected to a transverse pipe (7); the wall of the transverse pipe (7) is fixedly connected to a hose (8); the rear end of the hose (8) passes through the measuring frame (1) and is fixedly connected to a snow clearing assembly (9); A knocking assembly (17) is connected to the snow clearing assembly (9) and is used for knocking to compact the snow, thereby improving the efficiency of snow clearing; A vibration compensation component (24) is arranged on the front side wall of the measuring frame (1) and is used to compensate for measurement errors caused by vehicle vibration.

2. A device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The snow clearing assembly (9) includes two guide rods (91) fixedly connected to the inner wall of the measuring frame (1), and the two guide rods (91) are both slidably sleeved with guide sleeves (92). The side walls on the opposite side of the two guide sleeves (92) are fixedly connected to the same insert (10) through a bracket, and a snow blowing pipe (11) is inserted into the insert (10). The lower end of the snow blowing pipe (11) is tilted and arranged toward the rear. The upper end of the snow blowing pipe (11) is fixedly connected to a bend pipe (12), and the rear end of the bend pipe (12) is fixedly connected to the rear end of the hose (8). The side wall of the insert (10) is fixedly connected to a pulling cylinder (13), and the lower side wall of the movable plate (4) is fixedly connected to a small electric push rod (14). The movable end of the small electric push rod (14) is fixedly connected to a pulling block (15) that matches the pulling cylinder (13).

3. A device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 2, characterized in that: The rear inner wall of the measuring frame (1) is fixedly connected to a guide roller (16) via a multi-stage elastic telescopic rod, and the hose (8) passes through the guide roller (16).

4. The device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The knocking assembly (17) includes a knocking frame (171) fixedly connected to the rear side wall of the insert cylinder (10), the side wall of the knocking frame (171) is rotatably connected to a rotating rod (172), the left and right sides of the measuring frame (1) are both provided with through openings (18), the rear end of the rotating rod (172) is transmission-connected to the through opening (18) on the right side through a gear tooth plate transmission mechanism, the rod wall of the rotating rod (172) is fixedly sleeved with a cam shaft (19), the rear side wall of the insert cylinder (10) is fixedly connected to a support frame (20), the rear end of the support frame (20) is fixedly connected to a lifting cylinder (42), a lifting rod (21) is movably inserted in the lifting cylinder (42), the upper end of the lifting rod (21) is fixedly connected to a lifting plate (22), the lifting plate (22) and the lifting cylinder (42) are fixedly connected to the same spring, and the lower end of the lifting rod (21) is fixedly connected to a knocking plate (23).

5. The device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The vibration compensation assembly (24) includes a compensation cylinder (241) fixedly connected to the front side wall of the measuring frame (1), the lower inner wall of the compensation cylinder (241) is connected to a counterweight plate (242) via a spring, the upper side wall of the counterweight plate (242) is fixedly connected to a conductive frame (25), the conductive frame (25) is electrically connected to a power supply of a traction vehicle via a conductive slide mechanism, and a resistor plate (26) is embedded in the interior of the compensation cylinder (241) and is in sliding contact with the conductive frame (25), and the lower end of the resistor plate (26) is electrically connected to the controller (2) via a current sensor.

6. The device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The left side wall of the measuring frame (1) is fixedly connected to two cylinders (27) through a bracket, the inner wall of the cylinder (27) is rotatably connected to a round rod (28), the rod wall of the round rod (28) is fixedly connected to a vertical rod (29), and the lower side walls of the two cylinders (27) are each provided with a sliding opening that matches the vertical rod (29), the lower end of the vertical rod (29) located on the rear side extends out of the sliding opening and is fixedly connected to a laser generator (30), and the lower end of the vertical rod (29) located on the front side extends out of the sliding opening and is fixedly connected to an indicator plate (31), and a plurality of laser receivers (32) are fixedly connected to a side of the indicator plate (31) close to the laser generator (30), and the plurality of laser receivers (32) are all electrically connected to the controller (2).

7. The device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The left and right sides of the measuring frame (1) are fixedly connected to square tubes (33) with tapered openings on the lower sides. The two ends of the transverse tube (7) are fixedly connected to the front side walls of the two square tubes (33). Two first control valves (34) are provided in the transverse tube (7). A second control valve (35) is provided in the hose (8). A boosting tube (36) is fixedly connected to the upper side wall of the transverse tube (7). The rear end of the boosting tube (36) is connected to the measuring frame (1). A third control valve (37) is provided in the boosting tube (36).

8. The device for measuring the flatness of an asphalt pavement for maintenance of a highway according to claim 1, characterized in that: The side wall of the measuring frame (1) is fixedly connected to a visual sensor (38) electrically connected to the controller (2); the side wall of the movable plate (4) is fixedly connected to an adjusting electric push rod (39) via a bracket; the movable end of the adjusting electric push rod (39) is fixedly connected to an adjusting motor (40); and the output end of the adjusting motor (40) is fixedly connected to a condenser (41).

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