Pavement flatness detection device

Abstract

The invention relates to the technical field of detection devices, in particular to a pavement flatness detection device. The road surface flatness detection device comprises a detection mechanism, and the detection mechanism comprises a detection wheel, a connecting rod, an auxiliary rod, a top pressing plate, a sliding block and a contact type displacement sensor. When the detection wheel moves up and down, the connecting rod drives the top pressing plate to move up and down and drives the electromagnetic plate to move up and down in a horizontal state all the time, and the situation that when the connecting rod rotates, the sliding block and the electromagnetic plate are driven to incline, relative sliding is generated between the detection rod and the electromagnetic plate, and then the sensing precision of the contact type displacement sensor is affected is prevented. The invention provides a road surface flatness detection device to solve the problems that when an existing detection device is used for detecting a road surface, relative sliding is easily generated between a contact of a displacement sensor and a pressing plate, the telescopic resistance of the displacement sensor is increased by sliding friction force, the contact of the displacement sensor and the pressing plate are easily separated, and the detection accuracy is poor. And the detection precision is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and particularly relates to a road surface flatness detection device. Background Art

[0002] A road surface flatness detection device is a professional device used to measure and evaluate the flatness of a road surface, which is of great significance for ensuring road traffic safety, comfort, and extending the service life of the road. Response type instruments measure the bumpy conditions caused by the unevenness of the road surface on the vehicle. They are usually installed on the vehicle, and vibration data of the vehicle during driving is recorded by sensors, and then the flatness of the road surface is analyzed.

[0003] For example, the invention application with the publication number CN118583114A provides a road surface flatness detection device. By setting a cleaning mechanism, impurities on the traveling paths of the walking wheels at both ends of the mounting frame are swept to both sides of the mounting frame, ensuring that the flatness testing mechanism and the walking wheels are not affected by impurities during the testing process, and improving the accuracy of the flatness test results. However, when the device encounters a sunken or convex road surface, during the up and down movement of the test wheel, relative sliding occurs between the contact head of the displacement sensor and the pressure plate through the test arm. This sliding friction force will generate a torque deviating from the axial direction on the contact head of the displacement sensor, thereby increasing the telescopic resistance of the displacement sensor. Moreover, when the test wheel suddenly encounters a large depression or protrusion, it will cause an instantaneous position change of the test wheel, resulting in an instantaneous frictional force being applied to the contact head of the test wheel. This frictional force will also cause an instantaneous increase or decrease in the contact force, affecting the stability of the contact force and further affecting the detection accuracy. Summary of the Invention

[0004] The present invention provides a road surface flatness detection device to solve the problems that during the detection of the road surface by the existing detection device, relative sliding easily occurs between the contact head of the displacement sensor and the pressure plate, this sliding friction force increases the telescopic resistance of the displacement sensor, and the contact head of the displacement sensor and the pressure plate are easily disengaged, affecting the detection accuracy.

[0005] A road surface flatness detection device of the present invention adopts the following technical solution: A road surface flatness detection device includes a vehicle body and a detection mechanism. The detection mechanism includes a detection wheel, a connecting rod, an auxiliary rod, a top pressure plate, a slider, and a contact type displacement sensor. The connecting rod is inclined on the vehicle body, and the middle of the connecting rod is rotatably connected to the vehicle body. The detection wheel is rotatably arranged at the lower end of the connecting rod, and the detection wheel abuts against the road surface. The top pressure plate is rotatably arranged at the upper end of the connecting rod, and the top pressure plate is horizontally arranged. The auxiliary rod is arranged parallel to the connecting rod, the lower end of the auxiliary rod is rotatably arranged on the vehicle body, and the upper end of the auxiliary rod is rotatably connected to the top pressure plate.

[0006] The slider is arranged on the vehicle body so as to move up and down. The top pressing plate is arranged on the slider so as to slide horizontally, and the top pressing plate drives the slider to move up and down synchronously. An electromagnetic plate is fixedly arranged on the upper side surface of the slider, and the electromagnetic plate has magnetism after being electrified. A contact displacement sensor is fixedly arranged on the vehicle body. A detection rod is arranged on the contact displacement sensor. The detection rod is arranged vertically and can stretch. The lower end of the detection rod abuts against the electromagnetic plate, and the contact displacement sensor is used for detecting the distance that the detection rod moves downward.

[0007] Further, the detection rod includes a connecting pipe, a contact rod and a spring. Both the connecting pipe and the contact rod are arranged vertically. The connecting pipe is fixedly arranged on the contact displacement sensor. The upper end of the contact rod is slidably arranged in the connecting pipe, and the lower end of the contact rod abuts against the electromagnetic plate. The spring connects the connecting pipe and the contact rod.

[0008] Further, the detection mechanism further includes a power supply. The power supply is connected to the electromagnetic plate. A controller is arranged on the power supply. The controller controls the magnitude of the current output by the power supply according to the distance that the contact rod moves downward sensed by the contact displacement sensor, and further controls the magnitude of the magnetism of the electromagnetic plate. The more the contact rod moves downward, the greater the magnetism of the electromagnetic plate. The less the contact rod moves downward, the smaller the magnetism of the electromagnetic plate.

[0009] Further, the detection mechanism further includes a tension spring. The tension spring connects the vehicle body and the connecting rod.

[0010] Further, the direction in which the slider slides horizontally on the top pressing plate is the first direction. A limiting pipe is fixedly arranged on one side of the slider along the second direction. The second direction is the horizontal direction and is perpendicular to the first direction. The limiting pipe is arranged vertically. The detection mechanism further includes a limiting rod. The limiting rod is arranged vertically. The upper end of the limiting rod is fixedly arranged on the vehicle body, and the limiting rod is slidably arranged in the limiting pipe.

[0011] Further, the detection wheel includes a first screw rod, a first elastic film and two first retaining disks. The first screw rod is arranged along the second direction, and the first screw rod is rotatably arranged on the connecting rod. A first spiral plate is fixedly arranged on the first screw rod. The first spiral plate and the first screw rod are coaxially arranged. The first retaining disk is rotatably arranged on the connecting rod. The two first retaining disks are respectively arranged at both ends of the first screw rod. The first retaining disk and the first screw rod are coaxially arranged. The first screw rod and the first retaining disk are in threaded cooperation. A first knob is fixedly arranged at one end of the first screw rod. The first elastic film is sleeved on the first screw rod, and both ends of the first elastic film are fixedly connected to the two first retaining disks respectively. The first spiral plate abuts against the inner wall of the first elastic film.

[0012] Further, the vehicle body includes a rear frame and a front frame. Both the rear frame and the front frame are arranged along the first direction. Along the moving direction of the vehicle body, the front frame is located on the front side of the rear frame. A first fixing rod is fixedly arranged on the rear frame, and the first fixing rod is arranged along the first direction. A second fixing rod is fixedly arranged on the front frame, a sliding groove is formed in the second fixing rod, the sliding groove is arranged along the first direction, and one end of the first fixing rod is slidably arranged in the sliding groove. A baffle is fixedly arranged at one end of the first fixing rod arranged in the sliding groove, and a stop block is arranged at one end of the sliding groove close to the rear frame, and the stop block is used to abut against the baffle.

[0013] Further, eight rotating wheels are arranged on the vehicle body, four of which are rotatably arranged on the front frame, and the other four are rotatably arranged on the rear frame.

[0014] Further, each rotating wheel includes a second screw rod, a second elastic film and two second retaining plates. The second screw rod is arranged along the second direction, and the second screw rod is rotatably arranged on the vehicle body. A second spiral plate is fixedly arranged on the second screw rod. The second spiral plate and the second screw rod are coaxially arranged. The second retaining plate is rotatably arranged on the connecting rod, the two second retaining plates are respectively arranged at both ends of the second screw rod, and the second retaining plate and the second screw rod are coaxially arranged. The second screw rod and the second retaining plate are in threaded cooperation, and a second knob is fixedly arranged at one end of the second screw rod. The second elastic film is sleeved on the second screw rod, both ends of the second elastic film are fixedly connected to the two second retaining plates respectively, and the second spiral plate abuts against the inner wall of the second elastic film.

[0015] Further, an extension rod is fixedly arranged on the front frame, and the extension rod is arranged obliquely.

[0016] The beneficial effects of the present invention are as follows: For a road surface flatness detection device of the present invention, through the provided detection mechanism, when the connecting rod rotates, since the auxiliary rod and the connecting rod are arranged in parallel, the top pressing plate remains horizontal when the connecting rod rotates. When the detection wheel moves up and down, the top pressing plate is driven to move up and down by the connecting rod, and the slider and the electromagnetic plate are driven to move up and down in a horizontal state all the time, preventing the connecting rod from driving the slider and the electromagnetic plate to tilt when rotating, and relative sliding will occur between the detection rod and the electromagnetic plate, and this sliding friction force will generate a torque deviating from the axial direction on the detection rod, thereby increasing the telescopic resistance of the detection rod and further affecting the induction accuracy of the contact displacement sensor.

[0017] When the detection wheel encounters a large protrusion, the detection wheel quickly moves upward and makes the connecting rod rotate, and the upper end of the connecting rod quickly moves downward. At this time, the electromagnetic plate is likely to be separated from the detection rod. Therefore, by providing the magnetic electromagnetic plate, when the electromagnetic plate quickly moves downward, it can still drive the detection rod to synchronously descend, preventing the electromagnetic plate from being separated from the detection rod, thereby changing the stability of the contact force between the electromagnetic plate and the detection rod. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of a road surface flatness detection device provided by an embodiment of the present invention;

[0020] Figure 2 Front view of a road surface flatness detection device provided by an embodiment of the present invention;

[0021] Figure 3 For Figure 2 Enlarged view of part A in

[0022] Figure 4 Cross-sectional view of a road surface flatness detection device provided by an embodiment of the present invention;

[0023] Figure 5 For Figure 4 Enlarged view of part B in

[0024] Figure 6 Cross-sectional view of the detection wheel of a road surface flatness detection device provided by an embodiment of the present invention;

[0025] In the figure: 100, vehicle body; 101, rear frame; 102, front frame; 1021, limiting rod; 103, first fixing rod; 104, second fixing rod; 105, sliding groove; 106, extension rod; 111, first elastic film; 112, first screw rod; 1121, first screw plate; 1122, first knob; 113, first retaining disc; 120, rotating wheel; 201, connecting rod; 202, auxiliary rod; 203, pressing plate; 204, electromagnetic plate; 205, slider; 206, tension spring; 207, contact displacement sensor; 2071, detection rod; 208, detection wheel; 209, limiting tube. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Referring to Figures 1 to 6As shown in the figure, a road surface flatness detection device provided by an embodiment of the present invention includes a vehicle body 100 and a detection mechanism. The detection mechanism includes a detection wheel 208, a connecting rod 201, an auxiliary rod 202, a top pressing plate 203, a slider 205, and a contact displacement sensor 207. The connecting rod 201 is inclined on the vehicle body 100, and the middle part of the connecting rod 201 is rotatably connected to the vehicle body 100. The detection wheel 208 is rotatably arranged at the lower end of the connecting rod 201, and the detection wheel 208 abuts against the road surface. The top pressing plate 203 is rotatably arranged at the upper end of the connecting rod 201, and the top pressing plate 203 is horizontally arranged. The auxiliary rod 202 is arranged parallel to the connecting rod 201. The lower end of the auxiliary rod 202 is rotatably arranged on the vehicle body 100, and the upper end of the auxiliary rod 202 is rotatably connected to the top pressing plate 203.

[0028] The slider 205 is arranged on the vehicle body 100 to move up and down. The top pressing plate 203 is slidably arranged on the slider 205 along the horizontal direction, and the top pressing plate 203 drives the slider 205 to move up and down synchronously. An electromagnetic plate 204 is fixedly arranged on the upper side surface of the slider 205, and the electromagnetic plate 204 has magnetism after being energized. The contact displacement sensor 207 is fixedly arranged on the vehicle body 100. A detection rod 2071 is arranged on the contact displacement sensor 207. The detection rod 2071 is vertically arranged and can be telescoped. The lower end of the detection rod 2071 abuts against the electromagnetic plate 204, and the contact displacement sensor 207 is used to detect the distance that the detection rod 2071 moves downward.

[0029] When the vehicle body 100 moves, the detection wheel 208 rolls on the road surface. When the road surface is uneven, the detection wheel 208 moves up and down. When the detection wheel 208 moves upward, since the middle part of the connecting rod 201 is rotatably connected to the vehicle body 100, the connecting rod 201 rotates, and the upper end of the connecting rod 201 moves downward. Also, because the auxiliary rod 202 is arranged parallel to the connecting rod 201, the top pressing plate 203 remains horizontal when the connecting rod 201 rotates. Therefore, when the connecting rod 201 rotates, the top pressing plate 203 moves horizontally away from the detection wheel 208 and moves downward. The top pressing plate 203 moves relative to the slider 205 in the horizontal direction and drives the slider 205 to move downward synchronously. The detection rod 2071 extends as the slider 205 moves downward, and the detection rod 2071 contacts the electromagnetic plate 204 and remains in a vertical state.

[0030] When the detection wheel 208 moves downward when encountering a depression, the connecting rod 201 rotates, and the upper end of the connecting rod 201 moves upward. The connecting rod 201 drives the top pressing plate 203 to move horizontally toward the detection wheel 208 and move upward. The top pressing plate 203 drives the slider 205 to move upward synchronously. The detection rod 2071 shortens as the slider 205 moves downward, and the detection rod 2071 contacts the electromagnetic plate 204 and remains in a vertical state.

[0031] When the detection wheel 208 moves up and down, it drives the top pressure plate 203 to move up and down through the connecting rod 201, and drives the slider 205 and the electromagnetic plate 204 to move up and down while always maintaining a horizontal state, preventing the connecting rod 201 from driving the slider 205 and the electromagnetic plate 204 to tilt when rotating. A relative sliding will occur between the detection rod 2071 and the electromagnetic plate 204, and this sliding friction force will generate a torque deviating from the axis on the detection rod 2071, thereby increasing the telescopic resistance of the detection rod 2071 and further affecting the sensing accuracy of the contact displacement sensor 207.

[0032] When the detection wheel 208 encounters a large protrusion, the detection wheel 208 quickly moves upward, causing the connecting rod 201 to rotate, and the upper end of the connecting rod 201 quickly moves downward. At this time, the electromagnetic plate 204 is likely to be separated from the detection rod 2071. Therefore, by providing the magnetic electromagnetic plate 204, when the electromagnetic plate 204 quickly moves downward, it can still drive the detection rod 2071 to synchronously descend, preventing the electromagnetic plate 204 from being separated from the detection rod 2071, thereby affecting the stability of the contact force between the electromagnetic plate 204 and the detection rod 2071.

[0033] In this embodiment, the detection rod 2071 includes a connecting pipe, a contact rod and a spring. The connecting pipe and the contact rod are both vertically arranged. The connecting pipe is fixedly arranged on the contact displacement sensor 207. The upper end of the contact rod is slidably arranged in the connecting pipe, and the lower end of the contact rod abuts against the electromagnetic plate 204. The spring connects the connecting pipe and the contact rod.

[0034] In this embodiment, the electromagnetic plate 204 has magnetism after being energized. The detection mechanism further includes a power supply. The power supply is connected to the electromagnetic plate 204. A controller is arranged on the power supply. The controller controls the magnitude of the current output by the power supply according to the distance that the contact rod moves downward sensed by the contact displacement sensor 207, and further controls the magnitude of the magnetism of the electromagnetic plate 204. The more the contact rod moves downward, the greater the magnetism of the electromagnetic plate 204. The less the contact rod moves downward, the smaller the magnetism of the electromagnetic plate 204.

[0035] The displacement change brought about by the relative movement between the electromagnetic plate 204 and the contact displacement sensor 207 is reflected by the telescopic movement of the detection rod 2071, but the elastic force provided by its spring is not the same within the elongation and shortening strokes. The elastic force provided by the spring during shortening is greater than the elastic force provided by the spring during elongation. Therefore, the telescopic force received by the detection rod 2071 during shortening is greater than the telescopic force received by the detection rod 2071 during elongation.

[0036] The non-constant telescopic force of the detection rod 2071 may cause fluctuations in the contact force between the detection rod 2071 and the object to be measured. The change in the contact force will affect the sensing accuracy of the contact displacement sensor 207. In applications that require dynamic measurement, the non-constant telescopic force may cause the contact displacement sensor 207 to be unable to accurately capture rapidly changing displacements. Especially during high-frequency measurements, the fluctuations in the telescopic force may make it difficult for the sensor to maintain a stable output, resulting in distortion or data loss.

[0037] Therefore, when the contact displacement sensor 207 senses that the contact rod moves downward, the power supply is controlled by the controller, and then the magnetic force of the electromagnetic plate 204 is increased. When the contact displacement sensor 207 senses that the contact rod moves upward, the power supply is controlled by the controller, and then the magnetic force of the electromagnetic plate 204 is decreased. By controlling the magnitude of the magnetic force of the electromagnetic plate 204, the detection rod 2071 is maintained with a stable telescopic force, preventing the influence on the sensing accuracy of the contact displacement sensor 207.

[0038] In this embodiment, the detection mechanism further includes a tension spring 206. One end of the tension spring 206 is fixedly connected to the vehicle body 100, and the other end of the tension spring 206 is fixedly connected to the connecting rod 201. The tension spring 206 enables the detection wheel 208 to always abut against the road surface.

[0039] In this embodiment, the direction in which the slider 205 slides horizontally on the top pressing plate 203 is the first direction. A limiting tube 209 is fixedly arranged on one side of the slider 205 along the second direction. The second direction is a horizontal direction and is perpendicular to the first direction. The limiting tube 209 is arranged vertically. The detection mechanism further includes a limiting rod 1021. The limiting rod 1021 is arranged vertically, and the upper end of the limiting rod 1021 is fixedly arranged on the vehicle body 100. The limiting rod 1021 is slidably arranged in the limiting tube 209. The cooperation between the limiting rod 1021 and the limiting tube 209 enables the slider 205 to only move up and down, thereby keeping the contact position between the electromagnetic plate 204 and the detection rod 2071 unchanged.

[0040] An installation groove is formed in the slider 205. The installation groove is arranged along the first direction. Two limiting grooves are formed in the installation groove. The two limiting grooves are sequentially distributed along the second direction. The limiting grooves are arranged along the first direction. Limiting blocks are respectively arranged on both sides of the top pressing plate 203 along the second direction. Each limiting block is slidably arranged in one limiting groove.

[0041] In this embodiment, the detection wheel 208 includes a first screw rod 112, a first elastic film 111, and two first retaining discs 113. The first screw rod 112 is arranged along the second direction, and the first screw rod 112 is rotatably arranged on the connecting rod 201. A first spiral plate 1121 is fixedly arranged on the first screw rod 112. The first spiral plate 1121 and the first screw rod 112 are coaxially arranged. The first retaining disc 113 is rotatably arranged on the connecting rod 201. The two first retaining discs 113 are respectively arranged at both ends of the first screw rod 112. The first retaining disc 113 and the first screw rod 112 are coaxially arranged. The first screw rod 112 is in threaded cooperation with the first retaining disc 113. A first knob 1122 is fixedly arranged at one end of the first screw rod 112.

[0042] The first elastic film 111 is sleeved on the first screw rod 112. Both ends of the first elastic film 111 are fixedly connected to the two first retaining discs 113 respectively. The first spiral plate 1121 abuts against the inner wall of the first elastic film 111. The first elastic film 111 has elasticity. The portion where the first elastic film 111 abuts against the first spiral plate 1121 bulges outwards, and the portion where the first elastic film 111 does not abut against the first spiral plate 1121 sinks inwards.

[0043] In this embodiment, the vehicle body 100 includes a rear frame 101 and a front frame 102. Both the rear frame 101 and the front frame 102 are arranged along the first direction. Along the moving direction of the vehicle body 100, the front frame 102 is located on the front side of the rear frame 101.

[0044] A first fixing rod 103 is fixedly arranged on the rear frame 101. The first fixing rod 103 is arranged along the first direction. A second fixing rod 104 is fixedly arranged on the front frame 102. A sliding groove 105 is formed in the second fixing rod 104. The sliding groove 105 is arranged along the first direction. One end of the first fixing rod 103 is slidably arranged in the sliding groove 105. A baffle is fixedly arranged at one end of the first fixing rod 103 arranged in the sliding groove 105. A stop block is arranged at one end of the sliding groove 105 close to the rear frame 101. The stop block is used to abut against the baffle. The detection mechanism is arranged on the second fixing rod 104. Pull the rear frame 101 away from the front frame 102, so that the first fixing rod 103 slides in the sliding groove 105, and further make the distance between the rear frame 101 and the front frame 102 the farthest.

[0045] In this embodiment, eight rotating wheels 120 are arranged on the vehicle body 100. Four of the rotating wheels 120 are rotatably arranged on the front frame 102. The four rotating wheels 120 on the front frame 102 are sequentially distributed along the circumferential direction of the front frame 102. The other four rotating wheels 120 are rotatably arranged on the rear frame 101. The four rotating wheels 120 on the rear frame 101 are sequentially distributed along the circumferential direction of the rear frame 101.

[0046] In this embodiment, each rotating wheel 120 includes a second screw rod, a second elastic film, and two second retaining discs. The second screw rod is arranged along the second direction, and the second screw rod is rotatably arranged on the vehicle body 100. A second spiral plate is fixedly arranged on the second screw rod. The second spiral plate and the second screw rod are coaxially arranged. The second retaining disc is rotatably arranged on the connecting rod 201. The two second retaining discs are respectively arranged at both ends of the second screw rod. The second retaining disc and the second screw rod are coaxially arranged. The second screw rod and the second retaining disc are in threaded cooperation. A second knob is fixedly arranged at one end of the second screw rod.

[0047] The second elastic film is sleeved on the second screw rod. Both ends of the second elastic film are fixedly connected to the two second retaining discs respectively. The second spiral plate abuts against the inner wall of the second elastic film. The second elastic film has elasticity. The portion where the second elastic film abuts against the second spiral plate bulges outwards, and the portion where the second elastic film does not abut against the second spiral plate sinks inwards.

[0048] In this embodiment, an extension rod 106 is fixedly arranged on the front frame 102. The extension rod 106 is inclined. Hold the extension rod 106 by hand and pull the vehicle body 100 to move.

[0049] Working process: The electromagnetic plate 204 is electrified, and the electromagnetic plate 204 and the contact rod are magnetically attracted to each other. Hold the extension rod 106 by hand to drive the vehicle body 100 to move forward. The detection wheel 208 rolls on the road surface. Under the action of the tension spring 206, the detection wheel 208 always abuts against the road surface.

[0050] When the road surface is uneven, it will cause the detection wheel 208 to move up and down. When the detection wheel 208 moves upward, since the middle part of the connecting rod 201 is rotatably connected to the vehicle body 100, the connecting rod 201 rotates, and the upper end of the connecting rod 201 moves downward. Also, since the auxiliary rod 202 is arranged parallel to the connecting rod 201, the top pressing plate 203 remains horizontal when the connecting rod 201 rotates. Therefore, when the connecting rod 201 rotates, the top pressing plate 203 moves in the first direction away from the detection wheel 208 and moves downward.

[0051] Under the action of the limiting rod 1021, the slider 205 can only move up and down. Therefore, at this time, the top pressing plate 203 moves relative to the slider 205 in the first direction and drives the slider 205 to move downward synchronously. Under the action of the spring, the contact rod moves downward. The spring enables the contact rod to abut against the electromagnetic plate 204, and the contact rod always remains perpendicular to the slider 205 and the electromagnetic plate 204.

[0052] When the detection wheel 208 moves downward when encountering a depression, the connecting rod 201 rotates, and the upper end of the connecting rod 201 moves upward. The connecting rod 201 drives the top pressing plate 203 to move along the first direction towards the direction close to the detection wheel 208 and move upward. The top pressing plate 203 drives the slider 205 to move upward synchronously. The contact rod moves upward, and the spring is compressed. At this time, the contact rod still remains perpendicular to the slider 205 and the electromagnetic plate 204.

[0053] When the detection wheel 208 moves up and down, it drives the top pressing plate 203 to move up and down through the connecting rod 201, and drives the slider 205 and the electromagnetic plate 204 to move up and down while always maintaining a horizontal state, preventing the connecting rod 201 from driving the slider 205 and the electromagnetic plate 204 to tilt when rotating, and there will be relative sliding between the detection rod 2071 and the electromagnetic plate 204. This sliding friction force will generate a torque deviating from the axis on the detection rod 2071, thereby increasing the telescopic resistance of the detection rod 2071, and further affecting the induction accuracy of the contact displacement sensor 207.

[0054] When the detection wheel 208 encounters a large protrusion, the detection wheel 208 moves upward rapidly, and the connecting rod 201 rotates. The upper end of the connecting rod 201 moves downward rapidly. At this time, the electromagnetic plate 204 is likely to be separated from the contact rod. Therefore, by setting the magnetic electromagnetic plate 204, when the electromagnetic plate 204 moves downward rapidly, it can still drive the contact rod to move downward synchronously, preventing the electromagnetic plate 204 from being separated from the contact rod, thereby affecting the stability of the contact force between the electromagnetic plate 204 and the contact rod.

[0055] The displacement change brought by the relative movement between the electromagnetic plate 204 and the contact displacement sensor 207 is reflected in the telescopic movement of the detection rod 2071, but the elastic force provided by its spring is not the same within the stretching and shortening strokes. The elastic force provided by the spring during shortening is greater than the elastic force provided by the spring during elongation. Therefore, the telescopic force received by the detection rod 2071 during shortening is greater than the telescopic force received by the detection rod 2071 during elongation.

[0056] The non-constant telescopic force of the detection rod 2071 may cause fluctuations in the contact force between the detection rod 2071 and the object to be measured. The change in the contact force will affect the induction accuracy of the contact displacement sensor 207. In applications that require dynamic measurement, the non-constancy of the telescopic force may cause the contact displacement sensor 207 to be unable to accurately capture rapidly changing displacements. Especially during high-frequency measurements, the fluctuations in the telescopic force may make it difficult for the sensor to maintain a stable output, resulting in distortion or data loss.

[0057] Therefore, when the contact displacement sensor 207 senses that the contact rod moves downward, the power supply is controlled by the controller, and thus the magnetic force of the electromagnetic plate 204 increases. When the contact displacement sensor 207 senses that the contact rod moves upward, the power supply is controlled by the controller, and thus the magnetic force of the electromagnetic plate 204 decreases. By controlling the magnitude of the magnetic force of the electromagnetic plate 204, the detection rod 2071 is maintained with a stable expansion and contraction force, preventing the influence on the sensing accuracy of the contact displacement sensor 207.

[0058] Since the first elastic film 111 has elasticity, the portion where the first elastic film 111 abuts against the first spiral plate 1121 bulges outward, and the portion where the first elastic film 111 does not abut against the first spiral plate 1121 sinks inward. Therefore, when the detection wheel 208 contacts the road surface, the bulging portion on the detection wheel 208 contacts the road surface, thereby reducing the contact area with the road surface. Small stones can pass through the gap between the sunken portion of the detection wheel 208 and the ground, which can reduce the probability of the detection wheel 208 encountering sudden changes. The time and probability of the sudden depression and protrusion affecting the detection wheel 208 are both reduced.

[0059] When fine dust adheres to the detection wheel 208 and accumulates continuously, turn the first knob 1122. The first knob 1122 drives the first screw rod 112 to rotate. When the first screw rod 112 rotates, it drives the first spiral plate 1121 to rotate. When the first spiral plate 1121 rotates, the contact position between the first spiral plate 1121 and the first elastic film 111 is changed. The dust on the wheel body surface will fall off due to the wrinkles formed when the first elastic film 111 changes its shape, thereby cleaning the dust on the first elastic film 111. It is possible to avoid the situation where the diameter of the detection wheel 208 becomes larger due to long-term dust adhesion and accumulation, and further ensure the detection accuracy.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A road surface flatness detection device, characterized in that: It includes a vehicle body and a detection mechanism; the detection mechanism includes a detection wheel, a connecting rod, an auxiliary rod, a top pressure plate, a slider and a contact displacement sensor; the connecting rod is obliquely arranged on the vehicle body, and the middle part of the connecting rod is rotatably connected to the vehicle body; the detection wheel is rotatably arranged at the lower end of the connecting rod, and the detection wheel abuts against the road surface; the top pressure plate is rotatably arranged at the upper end of the connecting rod, and the top pressure plate is horizontally arranged; the auxiliary rod is arranged parallel to the connecting rod, the lower end of the auxiliary rod is rotatably arranged on the vehicle body, and the upper end of the auxiliary rod is rotatably connected to the top pressure plate; The slider is arranged on the vehicle body to move up and down; the top pressure plate is arranged on the slider to slide along the horizontal direction, and the top pressure plate drives the slider to move up and down synchronously; an electromagnetic plate is fixedly arranged on the upper side of the slider, and the electromagnetic plate has magnetism after being energized; the contact displacement sensor is fixedly arranged on the vehicle body, a detection rod is arranged on the contact displacement sensor, the detection rod is vertically arranged, the detection rod can stretch, and the lower end of the detection rod abuts against the electromagnetic plate, and the contact displacement sensor is used to detect the distance that the detection rod moves downward.

2. The road surface flatness detection device according to claim 1, characterized in that: The detection rod includes a connecting pipe, a contact rod and a spring, and both the connecting pipe and the contact rod are vertically arranged; the connecting pipe is fixedly arranged on the contact displacement sensor, the upper end of the contact rod is slidably arranged in the connecting pipe, and the lower end of the contact rod abuts against the electromagnetic plate; the spring connects the connecting pipe and the contact rod.

3. The road surface flatness detection device according to claim 2, characterized in that: The detection mechanism further includes a power supply, the power supply is connected to the electromagnetic plate, a controller is arranged on the power supply, and the controller controls the magnitude of the current output by the power supply according to the distance that the contact rod moves downward sensed by the contact displacement sensor, so as to control the magnetic magnitude of the electromagnetic plate; the more the contact rod moves downward, the greater the magnetic magnitude of the electromagnetic plate; the less the contact rod moves downward, the smaller the magnetic magnitude of the electromagnetic plate.

4. The road surface flatness detection device according to claim 1, characterized in that: The detection mechanism further includes a tension spring, and the tension spring connects the vehicle body and the connecting rod.

5. The road surface flatness detection device according to claim 1, characterized in that: The direction in which the slider slides horizontally on the top pressure plate is the first direction; a limiting tube is fixedly arranged on one side of the slider along the second direction, the second direction is a horizontal direction, and the second direction is perpendicular to the first direction; the limiting tube is vertically arranged; the detection mechanism further includes a limiting rod, the limiting rod is vertically arranged, the upper end of the limiting rod is fixedly arranged on the vehicle body, and the limiting rod is slidably arranged in the limiting tube.

6. The road surface flatness detection device according to claim 5, characterized in that: The detection wheel includes a first spiral rod, a first elastic film and two first retaining discs; the first spiral rod is arranged along the second direction, and the first spiral rod is rotatably arranged on the connecting rod; a first spiral plate is fixedly arranged on the first spiral rod; the first spiral plate and the first spiral rod are coaxially arranged; the first retaining disc is rotatably arranged on the connecting rod, and the two first retaining discs are respectively arranged at both ends of the first spiral rod, and the first retaining disc and the first spiral rod are coaxially arranged; the first spiral rod and the first retaining disc are in threaded cooperation, and a first knob is fixedly arranged at one end of the first spiral rod; the first elastic film is sleeved on the first spiral rod, and both ends of the first elastic film are respectively fixedly connected to the two first retaining discs, and the first spiral plate abuts against the inner wall of the first elastic film.

7. The pavement evenness detection device according to claim 5, characterized in that: The vehicle body includes a rear frame and a front frame; both the rear frame and the front frame are arranged along the first direction, and along the moving direction of the vehicle body, the front frame is located in front of the rear frame; a first fixing rod is fixedly arranged on the rear frame, and the first fixing rod is arranged along the first direction; a second fixing rod is fixedly arranged on the front frame, and a chute is formed in the second fixing rod, and the chute is arranged along the first direction, and one end of the first fixing rod is slidably arranged in the chute; a baffle is fixedly arranged at one end of the first fixing rod arranged in the chute, and a stopper is arranged at one end of the chute close to the rear frame, and the stopper is used for abutting against the baffle.

8. The pavement evenness detection device according to claim 7, characterized in that: Eight rotating wheels are arranged on the vehicle body, wherein four rotating wheels are rotatably arranged on the front frame, and the other four rotating wheels are rotatably arranged on the rear frame.

9. The pavement evenness detection device according to claim 8, characterized in that: Each rotating wheel includes a second spiral rod, a second elastic film and two second retaining discs; the second spiral rod is arranged along the second direction, and the second spiral rod is rotatably arranged on the vehicle body; a second spiral plate is fixedly arranged on the second spiral rod; the second spiral plate and the second spiral rod are coaxially arranged; the second retaining disc is rotatably arranged on the connecting rod, and the two second retaining discs are respectively arranged at both ends of the second spiral rod, and the second retaining disc and the second spiral rod are coaxially arranged; the second spiral rod and the second retaining disc are in threaded cooperation, and a second knob is fixedly arranged at one end of the second spiral rod; the second elastic film is sleeved on the second spiral rod, and both ends of the second elastic film are respectively fixedly connected to the two second retaining discs, and the second spiral plate abuts against the inner wall of the second elastic film.

10. The pavement evenness detection device according to claim 7, characterized in that: An extension rod is fixedly arranged on the front frame, and the extension rod is inclined.

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