Road flatness detection device

Abstract

The invention discloses a road flatness detection device, and belongs to the technical field of flatness detection equipment. The detection frame is provided with a longitudinal beam; cross beams are arranged at two ends of the longitudinal beams; traveling wheels are arranged at two ends of the cross beam; strip-shaped holes are formed in the longitudinal beams; a first mounting box and a second mounting box are arranged in the strip hole; displacement conversion mechanisms are symmetrically arranged on the two sides of the interior of the first mounting box; the two displacement conversion mechanisms are respectively connected with the measuring wheel; a first distance measuring element is arranged between the two displacement conversion mechanisms; sleeves are arranged outside the two sides of the second mounting box correspondingly. A sleeve capable of translating transversely is adopted, and a measuring ball is arranged at the bottom of the sleeve; in the transverse movement process of the sleeve, when the measuring ball transits from the rut to the normal road surface or transits from the normal road surface to the rut, the measuring ball can ascend and descend relative to the sleeve, so that the height values of the rut at multiple point positions and the section height value of the normal road surface are obtained, and flatness detection data are perfected.

Description

Technical Field

[0001] The present invention relates to a detection device, in particular to a highway flatness detection device, belonging to the field of road level value detection, especially the technical field of flatness detection equipment for road repair. Background Art

[0002] In the prior art, an eight-wheel flatness meter is usually used to detect the flatness of a road. The principle of this device is as follows: eight traveling wheels are arranged at the bottom of the frame, and the frame is towed forward; a measuring wheel that can be lifted and lowered is arranged at the middle position of the bottom of the frame, and a displacement sensor is installed on the measuring wheel; during measurement, taking the eight traveling wheels as the reference plane, the vertical displacement value of the measuring wheel is collected as the basis for mathematical statistics. For example, a highway subgrade and pavement flatness detection device disclosed in Chinese Patent Document No. CN114264273A adopts the above principle. In actual application scenarios, since the road width is much larger than the body width of the eight-wheel flatness meter, the overall width range of the road surface cannot be covered. In order to measure efficiently, the measuring wheel usually moves along the wheel track on the road surface (because the probability of potholes and depressions in the wheel track is the highest), and the level value within the wheel track is used to reflect the road surface flatness. However, the eight-wheel flatness meter in the above application scenarios still has the following defects: if the wheel track forms a rut (the wheels cause the road surface to sink as a whole), when the measuring wheel enters the rut and moves along its track, it can only detect the undulations inside the rut and the height difference at the starting end when entering the rut, and cannot detect the height difference between the two sides of the rut and the normal road surface, because the cross-section between the rut and the normal road surface is irregular, and it is difficult to know the more comprehensive rut subsidence situation. Therefore, it is necessary to design a device based on the existing eight-wheel flatness meter that can regularly detect the cross-section height difference formed between the two sides of the rut and the normal road surface in the working state. At the same time, if two groups of measuring wheels are used in the existing eight-wheel flatness meter, such as a road surface flatness detection device disclosed in Chinese Patent Document CN114541223B, corresponding detection elements need to be arranged on the top of each detection wheel, resulting in complex and cumbersome layout of various structures outside the frame, inconvenient transportation, and inability to reasonably utilize the internal space of the frame. Therefore, further improvement is needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies, and propose a highway flatness detection device that can effectively detect the height difference of ruts, expand the flatness detection range, improve the accuracy of flatness detection, and simplify the external structure of the device.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solutions A highway evenness detection device includes a detection vehicle frame; the detection vehicle frame has longitudinal beams; cross beams are arranged at both ends of the longitudinal beams; walking wheels are arranged at both ends of the cross beams; a strip hole is formed in the longitudinal beam; a first installation box and a second installation box are arranged in the strip hole; displacement conversion mechanisms are symmetrically arranged on both inner sides of the first installation box; the two displacement conversion mechanisms are respectively connected to measurement wheels; a first distance measuring element is arranged between the two displacement conversion mechanisms; sleeves are respectively arranged on both outer sides of the second installation box; a lifting mechanism and a second distance measuring element are arranged in the sleeves; a translation driving mechanism is arranged in the second installation box; the translation driving mechanism is respectively connected to the sleeves on both sides; a measurement ball is arranged at the bottom of the lifting mechanism.

[0005] Furthermore, the first installation box and the second installation box are distributed front and back in the strip hole; each displacement conversion mechanism respectively includes a lifting column; through holes are arranged at the bottom of the first installation box opposite to the lifting columns; the lifting columns slide in the first installation box.

[0006] Furthermore, the two measurement wheels are respectively arranged on the outer sides of the two lifting columns; the measurement wheels are connected to the lifting columns through wheel axles; the displacement conversion mechanism further includes a translation column and a transmission seat; the translation column is a permanent magnet; the transmission seat is fixedly arranged on the upper part of the translation column.

[0007] Furthermore, the transmission seat includes a vertical section and a wedge section; convex blocks are arranged on the inner side of the top of the first installation box; guide rods are arranged on both sides of the convex blocks; guide holes are respectively arranged on the two wedge sections opposite to the guide rods; the two transmission seats respectively drive the translation columns to move along the direction of the guide rods; a first spring is sleeved on the outer side of the guide rods; one end of the first spring is connected to the wedge section, and the other end is connected to the convex block.

[0008] Furthermore, convex edges are arranged on both sides of the lifting column; the convex edges are located on the outer side of the bottom of the first installation box; a second spring is arranged between the convex edges and the first installation box; the top of the lifting column contacts the wedge section; the first distance measuring element is a first Hall sensor; there are two first Hall sensors; the two first Hall sensors are respectively arranged opposite to the two translation columns; a metal shielding plate is arranged between the two first Hall sensors.

[0009] Furthermore, the translation driving mechanism includes a driving motor and two driving arms; the driving motor is arranged in the middle of the inner side of the second installation box; the driving motor is connected with a driving gear; the two driving arms are centrosymmetric; the driving arm includes a rack section and a connecting section; the rack section and the connecting section are arranged in a Z shape; the driving gear is arranged between the two rack sections; the upper and lower sides of the driving gear are respectively meshed with the two rack sections; the two connecting sections are respectively connected to the sleeves on both sides; the connection positions of the two connecting sections and the corresponding sleeves are at the same height.

[0010] Furthermore, the lifting mechanism includes a sliding column; the measurement ball is a universal roller; a universal joint is arranged at the bottom of the sliding column; the universal roller is embedded in the universal joint.

[0011] Furthermore, a limiting guide block is arranged on the outer side of the sliding column; a limiting guide groove is arranged on the inner side of the sleeve; the limiting guide block is slidably connected in the limiting guide groove; a third spring is arranged in the limiting guide groove; the third spring is connected to the limiting guide block.

[0012] Furthermore, the second ranging element is arranged on the inner side of the top of the sleeve; a magnet is arranged on the top of the sliding column; the second ranging element is a second Hall sensor; the second Hall sensor is arranged opposite to the top of the sliding column.

[0013] Furthermore, the driving motor is connected to the controller; the controller is connected to the encoder; the encoder is connected to any one of the traveling wheels for measuring the rotation speed of the traveling wheel, and further measuring the traveling speed of the detection vehicle frame.

[0014] The present invention has the following beneficial effects: When the detection vehicle frame starts to move, the measuring wheel is pulled into the wheel track belt; if the vehicle rut (wheel track belt) to be measured has formed a sunken rut, the measuring wheel will drop to the surface of the rut to detect the undulation in the rut; however, the sectional height difference between the edge of the rut and the normal road surface cannot be measured by the measuring wheel. Therefore, the present invention adopts a sleeve that can be horizontally translated, and a measuring ball is arranged at the bottom of the sleeve; during the horizontal movement of the sleeve, when the measuring ball transitions from the rut to the normal road surface, or from the normal road surface to the rut, the measuring ball will lift or lower relative to the sleeve, so as to obtain the sectional height values of the rut and the normal road surface at multiple points, and improve the flatness detection data.

[0015] A universal roller is used as the measuring ball at the bottom of the sleeve instead of a measuring wheel; when the detection vehicle frame is in motion, since the universal roller can automatically adapt to the motion direction, it will not interfere with the horizontal movement of the sleeve, making the horizontal movement of the sleeve flexible and smooth. At the same time, any one of the traveling wheels is connected to the encoder, and the encoder detects the rotation speed of the traveling wheel and feeds it back to the controller, and the controller obtains the displacement speed of the detection vehicle frame; if the vehicle speed is fast, the working interval of the driving motor can be shortened through the controller, so as to increase the horizontal movement frequency of the sleeve, and multiple-point data can also be measured at a fast vehicle speed; when the vehicle speed is slow, the working interval of the driving motor can be appropriately extended to still measure multiple-point data. Through the above design, the device can not only detect the level data inside the rut through the measuring wheel, but also obtain the multi-point sectional height difference data between the rut and the normal road surface through the measuring ball, and is not limited to the height difference at the starting position when entering the rut, and can more objectively and clearly reflect the road surface flatness.

[0016] Secondly, for the conventional detection of the measuring wheel in the rut, the present invention also improves its working mode. In order to achieve the lifting movement, the measuring wheel in the prior art needs to be provided with a dedicated longitudinal elastic lifting mechanism outside the detection vehicle frame, which changes the overall height and width of the vehicle frame, increases the size of the vehicle frame, and is not convenient for transportation and storage. At the same time, each measuring wheel needs to be equipped with a detection element on its corresponding elastic lifting mechanism separately, further increasing the complexity outside the vehicle frame. However, the present invention converts the lifting movement of the measuring wheel into a horizontal movement, which can reasonably utilize the internal space of the detection vehicle frame, does not occupy the outside of the vehicle frame, and will not increase its height. Moreover, the horizontal movement directions of the two measuring wheels after conversion are opposite and both move towards the same position, so the detection elements can be uniformly arranged here, making the layout of the detection vehicle frame more concise. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the detection vehicle frame in the present invention.

[0018] Figure 2 It is a schematic internal structure diagram of the first installation box in the present invention.

[0019] Figure 3 It is a schematic internal structure diagram of the second installation box in the present invention.

[0020] Figure 4 It is a schematic structural diagram of the lifting mechanism.

[0021] Figure 5 It is a schematic diagram of the cross-sectional elevation difference between the rut and the normal road surface.

[0022] Figure 5 The direction indicated by the arrow in it is the entry direction of the measuring wheel.

[0023] Figure 5 What h indicates in it is the cross-sectional elevation difference height targeted by the measuring ball.

[0024] Description of the reference numerals: 1 is the detection vehicle frame, 1-1 is the longitudinal beam, 1-2 is the cross beam, 1-3 is the strip hole, 2 is the traveling wheel, 3 is the first installation box, 4 is the second installation box, 5 is the measuring wheel, 6 is the sleeve, 6-1 is the limit guide groove, 7 is the measuring ball, 8 is the lifting column, 8-1 is the convex edge, 9 is the translation column, 10 is the transmission seat, 10-1 is the vertical section, 10-2 is the wedge section, 11 is the convex block, 12 is the guide rod, 13 is the first spring, 14 is the second spring, 15 is the first Hall sensor, 16 is the metal shielding plate, 17 is the drive motor, 18 is the drive arm, 18-1 is the rack section, 18-2 is the connecting section, 19 is the driving gear, 20 is the sliding column, 20-1 is the limit guide block, 21 is the universal joint, 22 is the third spring, 23 is the second Hall sensor. Detailed Embodiment

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] A highway flatness detection device includes a detection vehicle frame; the detection vehicle frame 1 has longitudinal beams 1-1; cross beams 1-2 are arranged at both ends of the longitudinal beams 1-1; walking wheels 2 are arranged at both ends of the cross beams 1-2; a strip hole 1-3 is formed in the longitudinal beam 1-1; a first installation box 3 and a second installation box 4 are arranged in the strip hole 1-3; displacement conversion mechanisms are symmetrically arranged on both sides inside the first installation box 3; the two displacement conversion mechanisms are respectively connected to measuring wheels 5; a first distance measuring element is arranged between the two displacement conversion mechanisms; sleeves 6 are respectively arranged on both outer sides of the second installation box 4; a lifting mechanism and a second distance measuring element are arranged in the sleeves 6; a translation driving mechanism is arranged in the second installation box 4; the translation driving mechanism is respectively connected to the sleeves 6 on both sides; a measuring ball 7 is arranged at the bottom of the lifting mechanism.

[0027] Furthermore, the first installation box 3 and the second installation box 4 are distributed front and back in the strip hole 1-3; each displacement conversion mechanism respectively includes a lifting column 8; through holes are arranged at the bottom of the first installation box 3 opposite to the lifting columns 8; the lifting columns 8 slide inside the first installation box 3.

[0028] Specifically, the strip hole 1-3 is opened along the length direction of the longitudinal beam 1-1, and the first installation box 3 and the second installation box 4 are arranged front and back in the strip hole 1-3; the lifting columns 8 in the first installation box 3 pass through the through holes and move up and down inside the first installation box 3 to provide the lifting condition for the measuring wheels 5.

[0029] Furthermore, the two measuring wheels 5 are respectively arranged on the outer sides of the two lifting columns 8; the measuring wheels 5 are connected to the lifting columns 8 through wheel axles; the displacement conversion mechanism further includes a translation column 9 and a transmission seat 10; the translation column 9 is a permanent magnet; the transmission seat 10 is fixedly arranged on the upper part of the translation column 9.

[0030] Furthermore, the transmission seat 10 includes a vertical section 10-1 and a wedge section 10-2; convex blocks 11 are arranged on the inner sides of the top of the first installation box 3; guide rods 12 are arranged on both sides of the convex blocks 11; guide holes are respectively arranged on the two wedge sections 10-2 opposite to the guide rods 12; the two transmission seats 10 respectively drive the translation column 9 to move along the direction of the guide rods 12; a first spring 13 is sleeved outside the guide rods 12; one end of the first spring 13 is connected to the wedge section 10-2, and the other end is connected to the convex block 11.

[0031] Furthermore, convex edges 8-1 are provided on both sides of the lifting column 8; the convex edges 8-1 are located outside the bottom of the first mounting box 3; a second spring 14 is provided between the convex edges 8-1 and the first mounting box 3; the top of the lifting column 8 contacts the wedge-shaped section 10-2; the first distance measuring element is the first Hall sensor 15; there are two first Hall sensors 15; the two first Hall sensors 15 are respectively arranged opposite to the two translation columns 9; a metal shielding plate 16 is provided between the two first Hall sensors 15.

[0032] In this embodiment, when the measuring wheel 5 enters the potholed road surface in the path to be measured, the second spring 14 will push the lifting column 8 and the measuring wheel 5 to descend simultaneously; when the lifting column 8 descends, the first spring 13 will also simultaneously push the wedge-shaped section 10-2 to move horizontally; the movement of the wedge-shaped section 10-2 will synchronously drive the vertical section 10-1 and the translation column 9 to move horizontally, causing the translation column 9 to move away from the first Hall sensor 15; conversely, when leaving the potholed road surface, the lifting column 8 and the measuring wheel 5 will rise, and the translation column 9 will approach the first Hall sensor 15. Since the translation column 9 is a permanent magnet, when it approaches or moves away from the first Hall sensor 15, it will cause a change in the magnetic field intensity, resulting in a change in the output level of the first Hall sensor 15. Then, by converting the level change into the distance between the first Hall sensor 15 and the translation column 9, the effect of detecting the undulation height can be achieved. And the specific method of converting this level change into a distance change, that is, the method of measuring distance through a Hall element, belongs to conventional technical means and has long been maturely applied in various distance measurement fields, so its specific conversion principle will not be elaborated.

[0033] At the same time, since two measuring wheels 5 are used in this embodiment, two first Hall sensors 15 are required to respectively detect the corresponding translation columns 9; therefore, a metal shielding plate 16 is preferably provided between the two first Hall sensors 15 for electromagnetic shielding to prevent interference.

[0034] After passing through the potholed road surface each time and completing the undulation; a data of the vertical height of the undulation will be generated; after collecting and storing all the undulation data on the path to be measured in the controller, the flatness can be calculated through relevant algorithms. And the algorithm for flatness also belongs to the conventional technical means in this field, and its relevant modules can be built into the controller, so it will not be elaborated.

[0035] Further, the translation drive mechanism includes a drive motor 17 and two drive arms 18; the drive motor 17 is arranged in the middle of the inner side of the second mounting box 4; the drive motor 17 is connected to a driving gear 19; the two drive arms 18 are centrally symmetrical; the drive arm 18 includes a rack segment 18-1 and a connecting segment 18-2; the rack segment 18-1 and the connecting segment 18-2 are arranged in a Z shape; the driving gear 19 is arranged between the two rack segments 18-1; the upper and lower sides of the driving gear 19 are respectively meshed with the two rack segments 18-1; the two connecting segments 18-2 are respectively connected to the sleeves 6 on both sides; the connection positions of the two connecting segments 18-2 and the corresponding sleeves 6 are at the same height.

[0036] Specifically, the lifting mechanism includes a sliding column 20 ; the measuring ball 7 is a universal roller; a universal joint 21 is provided at the bottom of the sliding column 20 ; and the universal roller is embedded in the universal joint 21 .

[0037] Specifically, a limiting guide block 20-1 is disposed outside the sliding column 20; a limiting guide groove 6-1 is disposed inside the sleeve 6; the limiting guide block 20-1 is slidably connected in the limiting guide groove 6-1; a third spring 22 is disposed in the limiting guide groove 6-1; and the third spring 22 is connected to the limiting guide block 20-1.

[0038] Specifically, the second distance measuring element is arranged on the inner side of the top of the sleeve 6 ; a magnetic steel is arranged on the top of the sliding column 20 ; the second distance measuring element is a second Hall sensor 23 ; the second Hall sensor 23 is arranged opposite to the top of the sliding column 20 .

[0039] Specifically, the driving motor 17 is connected to the controller; the controller is connected to the encoder; the encoder is connected to any running wheel 2 to measure the rotation speed of the running wheel 2 and further measure the travel speed of the detection frame 1.

[0040] This embodiment is based on the fact that the path to be measured (wheel track) has formed a relatively long depression, that is, a rut; at this time, the measuring wheel 5 will drop directly after entering the rut from the starting end; but the drop height cannot fully reflect the rut state, because the cross-sectional height between the rut and the road surface is irregular. If only the ups and downs in the rut, or the height difference at the starting end of the rut is detected, the rut situation cannot be fully reflected. Therefore, a laterally movable sleeve 6 and a measuring ball 7 are used. In the process of detecting the movement of the frame 1, the measuring ball 7 can move laterally at a fixed gap, traveling between the bottom of the rut and the normal road surface, and obtain the cross-sectional height difference data at multiple points, so as to improve the sinking situation of the rut relative to the normal road surface. See the attached Figure 5 In the figure, h represents the drop height to be detected by the measuring ball 7.

[0041] And since the measuring ball 7 is connected to the bottom of the sliding column 20 by a universal joint 21 and its movement direction is not restricted, there will be no interference when the inspection vehicle frame 1 moves laterally.

[0042] Specifically, the driving motor 17 operates to drive the driving gear 19 to rotate, thereby causing the upper and lower driving arms 18 to translate in opposite directions. Further, the sleeve 6 is driven to translate to both sides; the translation length is determined according to the position of the cross-section. When the measuring ball 7 crosses the cross-section, it will push the sliding column 20 upward, and the magnet on the top of the sliding column 20 will approach the second Hall sensor 23, so that the height difference data of the cross-section can be obtained. At the same time, an encoder is used to detect the rotation speed of the traveling wheel 2, and then the traveling speed of the inspection vehicle frame 1 is judged. Then, according to the traveling speed of the inspection vehicle frame 1, the working gap of the driving motor 17 is adjusted to ensure a sufficient number of inspection points.

[0043] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A highway evenness detection device, comprising a detection vehicle frame; the detection vehicle frame (1) has longitudinal beams (1-1); cross beams (1-2) are arranged at both ends of the longitudinal beams (1-1); walking wheels (2) are arranged at both ends of the cross beams (1-2), characterized in that: A longitudinal beam (1-1) is provided with a slotted hole (1-3); a first mounting box (3) and a second mounting box (4) are arranged in the slotted hole (1-3); displacement conversion mechanisms are symmetrically arranged on both inner sides of the first mounting box (3); two displacement conversion mechanisms are respectively connected to measuring wheels (5); a first distance measuring element is arranged between the two displacement conversion mechanisms; sleeves (6) are respectively arranged on the outer parts of both sides of the second mounting box (4); a lifting mechanism and a second distance measuring element are arranged in the sleeves (6); a translation driving mechanism is arranged in the second mounting box (4); the translation driving mechanism is respectively connected to the sleeves (6) on both sides; a measuring ball (7) is arranged at the bottom of the lifting mechanism.

2. The highway evenness detection device according to claim 1, characterized in that: The first mounting box (3) and the second mounting box (4) are distributed front and back in the slotted hole (1-3); each displacement conversion mechanism respectively includes a lifting column (8); through holes are arranged at the bottom of the first mounting box (3) opposite to the lifting column (8); the lifting column (8) slides in the first mounting box (3).

3. The highway evenness detection device according to claim 2, characterized in that: Two measuring wheels (5) are respectively arranged on the outer sides of the two lifting columns (8); the measuring wheels (5) are connected to the lifting columns (8) through wheel shafts; the displacement conversion mechanism further includes a translation column (9) and a transmission seat (10); the translation column (9) is a permanent magnet; the transmission seat (10) is fixedly arranged on the upper part of the translation column (9).

4. The highway evenness detection device according to claim 3, wherein: The transmission seat (10) includes a vertical section (10-1) and a wedge section (10-2); bumps (11) are arranged on the inner side of the top of the first mounting box (3); guide rods (12) are arranged on both sides of the bumps (11); guide holes are respectively arranged on the two wedge sections (10-2) opposite to the guide rods (12); the two transmission seats (10) respectively drive the translation column (9) to move along the direction of the guide rods (12); a first spring (13) is sleeved on the outer side of the guide rods (12); one end of the first spring (13) is connected to the wedge section (10-2), and the other end is connected to the bump (11).

5. The highway flatness detection device according to claim 4, characterized in that: Flanges (8-1) are arranged on both sides of the lifting column (8); the flanges (8-1) are located on the outer side of the bottom of the first mounting box (3); a second spring (14) is arranged between the flanges (8-1) and the first mounting box (3); the top of the lifting column (8) contacts the wedge section (10-2); the first distance measuring element is a first Hall sensor (15); there are two first Hall sensors (15); the two first Hall sensors (15) are respectively arranged opposite to the two translation columns (9); a metal shielding plate (16) is arranged between the two first Hall sensors (15).

6. The highway evenness detection device according to claim 2, characterized in that: The translation drive mechanism includes a drive motor (17) and two drive arms (18); the drive motor (17) is arranged in the middle inside of the second mounting box (4); the drive motor (17) is connected with a driving gear (19); the two drive arms (18) are centrosymmetric; the drive arm (18) includes a rack section (18-1) and a connecting section (18-2); the rack section (18-1) and the connecting section (18-2) are arranged in a Z shape; the driving gear (19) is arranged between the two rack sections (18-1); the upper and lower sides of the driving gear (19) are respectively meshed with the two rack sections (18-1); the two connecting sections (18-2) are respectively connected with the sleeves (6) on both sides; the connection positions of the two connecting sections (18-2) and the corresponding sleeves (6) are at the same height.

7. The highway flatness detection device according to claim 6, characterized in that: The lifting mechanism includes a sliding column (20); the measuring ball (7) is a universal roller; a universal joint (21) is arranged at the bottom of the sliding column (20); the universal roller is embedded in the universal joint (21).

8. The highway evenness detection device according to claim 7, characterized in that: A limit guide block (20-1) is arranged on the outer side of the sliding column (20); a limit guide groove (6-1) is arranged on the inner side of the sleeve (6); the limit guide block (20-1) is slidably connected in the limit guide groove (6-1); a third spring (22) is arranged in the limit guide groove (6-1); the third spring (22) is connected with the limit guide block (20-1).

9. The highway evenness detection device according to claim 8, characterized in that: The second distance measuring element is arranged on the inner side of the top of the sleeve (6); a magnet is arranged at the top of the sliding column (20); the second distance measuring element is a second Hall sensor (23); the second Hall sensor (23) is arranged opposite to the top of the sliding column (20).

10. A highway flatness detection device according to claim 9, characterized in that: The drive motor (17) is connected with the controller; the controller is connected with the encoder; the encoder is connected with any one of the traveling wheels (2) and is used for measuring the rotational speed of the traveling wheel (2), and further measuring the traveling speed of the detection vehicle frame (1).

Images