Novel laser deflection meter

Abstract

The utility model relates to the field of laser deflection instrument discloses a new laser deflection instrument, including laser dynamic deflection car main part, a plurality of working wheels are installed to the laser dynamic deflection car main part outside, the laser dynamic deflection car main part outside is installed with the optical fiber gyro main part, the laser dynamic deflection car main part outside is provided with cleaning assembly, the laser dynamic deflection car main part top is provided with detection assembly, the cleaning assembly includes the protective shell, the protective shell outside fixedly connected in the laser dynamic deflection car main part top, the protective shell inner wall is fixedly connected with motor. In the utility model, the rotating shaft is driven by motor to drive the rotating disc to rotate, makes L type rod reciprocating sliding in the limiting block through the connecting piece, axle, and the spring in the shell keeps the brush plate in contact with the road surface, realizes the sustained cleaning to the measured ground, avoids the sundries interference laser light path, ensures the accuracy of deflection detection data and the continuous work ability of equipment.

Description

Technical Field

[0001] This utility model relates to the field of laser deflectometers, and more particularly to a novel laser deflectometer. Background Technology

[0002] In my country, flexible pavement design uses resilient modulus as the design parameter and deflection as the mechanical control index. Deflection is defined as the vertical surface deformation of the roadbed / pavement under vertical load. Its field measurement is convenient and requires no additional calculations, reflecting the bearing capacity of the roadbed / pavement to a certain extent. Over the past 20 years, international pavement inspection technology has shown a trend from manual to automated methods, from damaged to non-damaged methods, and from general techniques to high-tech methods. Deflection testing technology has received significant attention, with traditional Benkelman beams gradually being replaced by automatic deflectometers, vibratory deflectometers, and falling weight deflectometers (FWD). Among these, FWD is widely used in over 60 countries due to its fast measurement speed, high accuracy, and ease of operation. Combined with inversion analysis software, it has improved the scientific level of inspection and evaluation.

[0003] Traditional laser deflectometers often lack continuous cleaning of the laser sensor measurement surface. Road dust, debris, or water accumulation can easily obstruct the laser beam path, causing deviations in Doppler frequency shift measurements and thus affecting the accuracy of deflection value inversion.

[0004] To address the above issues, a novel laser deflectometer is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a novel laser deflectometer, which aims to improve the problem that existing laser deflectometers lack a continuous cleaning mechanism for the laser sensor measurement surface. Road dust, debris, or water accumulation can easily obstruct the laser beam path, causing deviations in Doppler frequency shift measurement and thus affecting the accuracy of deflection value inversion.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a novel laser deflection meter, comprising a laser dynamic deflection vehicle body, wherein multiple working wheels are installed on the outside of the laser dynamic deflection vehicle body, a fiber optic gyroscope body is installed on the outside of the laser dynamic deflection vehicle body, a cleaning component is provided on the outside of the laser dynamic deflection vehicle body, and a detection component is provided on the top of the laser dynamic deflection vehicle body.

[0007] The cleaning assembly includes a protective shell, the outer side of which is fixedly connected to the top of the laser dynamic bending vehicle body. A motor is fixedly connected to the inner wall of the protective shell, and a rotating shaft is fixedly connected to the output end of the motor. A turntable is fixedly connected to the bottom end of the rotating shaft, and a connecting shaft is fixedly connected to the bottom edge of the turntable. An L-shaped rod is fixedly connected to the outer side of the connecting shaft, and a thin shell is fixedly connected to the end of the L-shaped rod away from the connecting shaft. A brush plate is slidably connected inside the thin shell, and multiple springs are fixedly connected to the top of the brush plate.

[0008] As a further description of the above technical solution:

[0009] The detection component includes a bracket, which is fixedly connected to the top of the laser dynamic bending vehicle body on the outside. Multiple fixing blocks are fixedly connected to the bottom of the bracket, and multiple Doppler laser ranging sensor bodies are installed on the inner wall of the fixing blocks.

[0010] As a further description of the above technical solution:

[0011] The top end of the spring is fixedly connected to the inner top wall of the thin shell.

[0012] As a further description of the above technical solution:

[0013] The bottom of the laser dynamic bending vehicle body is fixedly connected to a limiting block, and the outer side of the L-shaped rod is slidably connected inside the limiting block.

[0014] As a further description of the above technical solution:

[0015] The outer side of the rotating shaft is rotatably connected to the inside of the laser dynamic bending vehicle body.

[0016] As a further description of the above technical solution:

[0017] The laser centerline of the Doppler laser ranging sensor body forms an angle of approximately 2 degrees with the vertical direction.

[0018] As a further description of the above technical solution:

[0019] The main bodies of the multiple Doppler laser rangefinder sensors are located at positions 100 mm, 300 mm and 750 mm in front of the center of the working wheel, respectively.

[0020] As a further description of the above technical solution:

[0021] The motor is fixedly connected to the top of the laser dynamic bending vehicle body on the outside.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the rotating shaft driven by the motor drives the turntable to rotate, and the L-shaped rod slides back and forth in the limiting block through the connecting parts and the connecting shaft. With the help of the spring in the thin shell, the brush plate is kept in contact with the road surface, which realizes continuous cleaning of the measured ground, avoids the interference of debris with the laser light path, and ensures the accuracy of the deflection detection data and the continuous working capability of the equipment.

[0024] 2. In this utility model, by using a Doppler laser ranging sensor body installed at an angle of approximately 2 degrees to the vertical direction, combined with a fiber optic gyroscope body to monitor the vehicle's pitch and roll angular velocities in real time and perform inertial algorithm compensation, accurate measurement of the dynamic deflection value of the road surface is achieved under high-speed driving conditions of 15-80km / h, solving the problem of traditional equipment affecting traffic due to low-speed detection. Attached Figure Description

[0025] Fig. 1 This is a perspective view of the novel laser deflectometer proposed in this utility model;

[0026] Fig. 2 This is a schematic diagram of the turntable structure of the novel laser deflectometer proposed in this utility model;

[0027] Fig. 3 This is a schematic diagram of the Doppler laser ranging sensor body of the novel laser deflectometer proposed in this utility model.

[0028] Legend:

[0029] 1. Laser dynamic bending vehicle body; 2. Bracket; 3. Fixing block; 4. Doppler laser rangefinder sensor body; 5. Fiber optic gyroscope body; 6. Working wheel; 7. Protective shell; 8. Limiting block; 9. Motor; 10. Rotating shaft; 11. Turntable; 12. Connecting shaft; 13. L-shaped rod; 14. Thin shell; 15. Spring; 16. Brush plate; 17. Turntable. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figs. 1-3 An embodiment of this utility model is provided: a novel laser deflection meter, including a laser dynamic deflection vehicle body 1, multiple working wheels 6 installed on the outside of the laser dynamic deflection vehicle body 1, a fiber optic gyroscope body 5 installed on the outside of the laser dynamic deflection vehicle body 1, a cleaning component provided on the outside of the laser dynamic deflection vehicle body 1, and a detection component provided on the top of the laser dynamic deflection vehicle body 1.

[0032] The cleaning assembly includes a protective shell 7, which is fixedly connected to the top of the laser dynamic bending vehicle body 1 on its outer side. A motor 9 is fixedly connected to the inner wall of the protective shell 7. A rotating shaft 10 is fixedly connected to the output end of the motor 9. A turntable 17 is fixedly connected to the bottom end of the rotating shaft 10. An 11 is fixedly connected to the bottom edge of the turntable 17. A connecting shaft 12 is slidably connected to the outer side of the 11. An L-shaped rod 13 is fixedly connected to the outer side of the connecting shaft 12. A thin shell 14 is fixedly connected to the end of the L-shaped rod 13 away from the connecting shaft 12. A brush plate 16 is slidably connected inside the thin shell 14. Multiple springs 15 are fixedly connected to the top of the brush plate 16.

[0033] Specifically, the main body 1 of the laser dynamic bending vehicle is used to carry the entire equipment and install other components; the working wheels 6 are used to support the equipment and drive its movement; the main body 5 of the fiber optic gyroscope is used to monitor the pitch and roll angular velocities of the vehicle in real time to compensate for the interference of vehicle vibration on the detection. The core of the fiber optic gyroscope 5 utilizes the Sagnac effect and usually includes a light source, a fiber optic loop wound with a long single-mode fiber, a coupler, a detector, and signal processing circuits. During operation, the light emitted by the light source is split into two beams by a coupler, which propagate in opposite directions in the fiber optic loop. When the device pitches or rolls with the vehicle, the two beams generate a phase difference. The detector converts the phase difference into an electrical signal, which is then processed by the circuit to output an angular velocity signal, thereby enabling real-time monitoring of the crossbeam's motion state and providing data support for vehicle attitude change compensation. The protective shell 7 in the cleaning assembly is used to fix the top of the laser dynamic bending vehicle body 1, protecting internal components such as the motor 9. The motor 9 is driven by an external controller, and the motor 9 drives the rotating shaft 10 to rotate through its output end. The rotating shaft 10 connects the motor 9 and the turntable 17, transmitting rotational power. The turntable 17 rotates under the drive of the rotating shaft 10, passing through the bottom edge. 11 drives the connecting shaft 12 to move; 11 is used to connect the turntable 17 and the connecting shaft 12, converting the rotational motion of the turntable into the sliding motion of the connecting shaft; the connecting shaft 12 is used to connect 11 and the L-shaped rod 13, driving the L-shaped rod to slide back and forth within the limiting block 8; the L-shaped rod 13 is used to connect the connecting shaft 12 and the thin shell 14, transmitting motion to drive the thin shell to move up and down; the thin shell 14 is used to install the brush plate 16 and the spring 15, and drive the brush plate to move; the brush plate 16 is used to move up and down under the drive of the thin shell 14 to remove road debris; the spring 15 is used to fix the top end to the inner top wall of the thin shell 14, providing elastic force to the brush plate 16 so that it remains in contact with the road surface; the limiting block 8 is used to fix to the bottom of the laser dynamic bending vehicle body 1, constraining the sliding trajectory of the L-shaped rod 13.

[0034] Reference Fig. 1 and Fig. 3 The detection component includes a bracket 2, which is fixedly connected to the top of the laser dynamic bending vehicle body 1 on the outside. Multiple fixing blocks 3 are fixedly connected to the bottom of the bracket 2, and multiple Doppler laser ranging sensor bodies 4 are installed on the inner wall of the fixing blocks 3.

[0035] Specifically, bracket 2 is used to fix the outer side of the top of the laser dynamic deflection vehicle body 1 to support the multiple fixing blocks 3 fixedly connected to its bottom; fixing blocks 3 are used to fix the bottom of bracket 2; Doppler laser ranging sensor body 4 is used to measure the road surface deformation speed through the Doppler laser ranging principle, and then invert the dynamic deflection value. The sensor body integrates a light source emitting module, an optical receiving system, a photoelectric detector and a signal processing circuit.

[0036] Reference Figs. 1-3 The top of the spring 15 is fixedly connected to the inner top wall of the thin shell 14. The bottom of the laser dynamic bending vehicle body 1 is fixedly connected to the limit block 8. The outer side of the L-shaped rod 13 is slidably connected to the inside of the limit block 8. The outer side of the rotating shaft 10 is rotatably connected to the inside of the laser dynamic bending vehicle body 1. Multiple Doppler laser ranging sensor bodies 4 are located at positions 100 mm, 300 mm and 750 mm in front of the center of the working wheel 6, respectively. The outer side of the motor 9 is fixedly connected to the top of the laser dynamic bending vehicle body 1.

[0037] Specifically, spring 15 provides elastic force to brush plate 16 to keep it in contact with the road surface; limit block 8 constrains the outer sliding trajectory of L-shaped rod 13; L-shaped rod 13 transmits the movement of connecting shaft 12 to drive thin shell 14 to move; rotating shaft 10 connects motor 9 and turntable 17 to transmit rotational power; multiple Doppler laser rangefinder sensor bodies 4 are located at positions 100 mm, 300 mm and 750 mm in front of the center of working wheel 6 respectively to measure the deformation rate of multiple points on the road surface to invert dynamic deflection value; motor 9 drives rotating shaft 10 to rotate to drive cleaning assembly operation.

[0038] Working principle: The bracket 2 on top of the laser dynamic deflection vehicle body 1 mounts multiple Doppler laser ranging sensor bodies 4 via fixing blocks 3, with the laser centerline forming an angle of approximately 2 degrees with the vertical direction. When the vehicle travels at a speed of 15-80 km / h, the sensor 4 emits a laser to the road surface using the Doppler effect. The vertical sinking speed of the road surface is calculated based on the frequency shift of the reflected light. The three sensors 4 are located 100 mm, 300 mm, and 750 mm in front of the center of the working wheel 6, respectively, simultaneously collecting deformation data at multiple points within the deflection basin. The dynamic deflection value is inverted using elastic deformation theory. The fiber optic gyroscope body 5 monitors the vehicle's pitch and roll angular velocities in real time. An inertial algorithm compensates for the interference of vehicle vibration on the sensor 4 measurements, ensuring the accuracy of the data during high-speed travel.

[0039] The motor 9 inside the protective shell 7 is fixed to the top of the laser dynamic bending vehicle body 1, driving the rotating shaft 10 to rotate, which in turn drives the connecting piece 11 at the edge of the turntable 17 to rotate. The connecting piece 11 pushes the L-shaped rod 13 to slide back and forth within the limiting block 8 through the connecting shaft 12, causing the thin shell 14 at the end of the L-shaped rod 13 to drive the brush plate 16 to move back and forth. The spring 15 on the top wall inside the thin shell 14 uses elastic force to keep the brush plate 16 in close contact with the road surface, periodically removing dust and debris from the measuring surface of the sensor 4, and preventing the laser beam path from being blocked.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel laser deflection meter, comprising a laser dynamic deflection vehicle body (1), characterized in that: Multiple working wheels (6) are installed on the outside of the main body (1) of the laser dynamic bending vehicle. A fiber optic gyroscope body (5) is installed on the outside of the main body (1) of the laser dynamic bending vehicle. A cleaning component is provided on the outside of the main body (1) of the laser dynamic bending vehicle. A detection component is provided on the top of the main body (1) of the laser dynamic bending vehicle. The cleaning assembly includes a protective shell (7), the outer side of which is fixedly connected to the top of the laser dynamic bending vehicle body (1). A motor (9) is fixedly connected to the inner wall of the protective shell (7). A rotating shaft (10) is fixedly connected to the output end of the motor (9). A turntable (17) is fixedly connected to the bottom end of the rotating shaft (10). An (11) is fixedly connected to the bottom edge of the turntable (17). A connecting shaft (12) is slidably connected to the outer side of the (11). An L-shaped rod (13) is fixedly connected to the outer side of the connecting shaft (12). A thin shell (14) is fixedly connected to the end of the L-shaped rod (13) away from the connecting shaft (12). A brush plate (16) is slidably connected inside the thin shell (14). A plurality of springs (15) are fixedly connected to the top of the brush plate (16).

2. The novel laser deflectometer according to claim 1, characterized in that: The detection component includes a bracket (2), which is fixedly connected to the top of the laser dynamic bending vehicle body (1) on the outside. Multiple fixing blocks (3) are fixedly connected to the bottom of the bracket (2), and multiple Doppler laser ranging sensor bodies (4) are installed on the inner wall of the fixing blocks (3).

3. The novel laser deflectometer according to claim 1, characterized in that: The top end of the spring (15) is fixedly connected to the inner top wall of the thin shell (14).

4. The novel laser deflectometer according to claim 1, characterized in that: The bottom of the laser dynamic bending vehicle body (1) is fixedly connected to a limiting block (8), and the outer side of the L-shaped rod (13) is slidably connected inside the limiting block (8).

5. The novel laser deflectometer according to claim 1, characterized in that: The rotating shaft (10) is rotatably connected to the inside of the laser dynamic bending vehicle body (1) on the outside.

6. The novel laser deflectometer according to claim 2, characterized in that: The laser centerline of the Doppler laser ranging sensor body (4) forms an angle of approximately 2 degrees with the vertical direction.

7. The novel laser deflectometer according to claim 2, characterized in that: The multiple Doppler laser rangefinder sensor bodies (4) are located at positions 100 mm, 300 mm and 750 mm in front of the center of the working wheel (6), respectively.

8. The novel laser deflectometer according to claim 1, characterized in that: The motor (9) is fixedly connected to the top of the laser dynamic bending vehicle body (1) on the outside.

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