Quality detection device for road construction

Abstract

The invention relates to a quality detection device for road construction, which comprises a rack connected to the rear part of a vehicle body through a connecting mechanism, and one side of the rack is provided with a detection mechanism for detecting the ground flatness; the detection mechanism comprises a detection assembly and an amplification assembly; the invention relates to the technical field of road construction. According to the quality detection device for road construction, through a mechanical-electric control coupling design (lever amplification and high-precision rheostat), a dynamic self-adaptive counterweight (tungsten alloy ring rapid adjustment), multi-stage buffer vibration suppression (nitrogen cylinder and all-steel rack) and two-parameter integrated detection (flatness / hardness synchronization), the quality of the road construction is detected; the comprehensive error of road quality detection is reduced from + / -15% of traditional equipment to + / -2.5%, the detection efficiency is improved by more than three times, and the method is suitable for construction quality control of severe scenes such as high-grade highways and airport runways.

Description

Technical Field

[0001] The present invention relates to the technical field of road construction, and specifically to a quality inspection device for road construction. Background Art

[0002] After road construction is completed, in order to ensure the normal use of the road, it is usually necessary to detect the flatness, hardness, and water permeability of the road surface to prevent unqualified roads from causing significant economic losses. Traditional road construction quality inspection devices have the following significant defects in technical implementation and practical application, which restrict the detection efficiency and accuracy:

[0003] 1. Low mechanical detection accuracy

[0004] Difficulty in capturing micro-undulations: Traditional mechanical detection devices (such as swing-arm type or roller-contact type) rely on direct contact measurement. When the ground unevenness is less than 2 mm, due to the influence of mechanical transmission clearance and friction, the error rate is as high as 15%-20%. For example, a certain literature points out that for a conventional roller structure at a driving speed of 5 km / h, the missed detection rate for a 1-mm depression exceeds 30%.

[0005] Poor signal conversion linearity: In the early stage, potentiometers or encoders were used to directly measure displacement. Affected by mechanical wear and temperature drift, the non-linear error of the resistance signal can reach ±5%.

[0006] 2. Weak anti-vibration interference ability

[0007] Vehicle vibration coupling problem: The vertical vibration generated when the vehicle is driving (frequency range 5-20 Hz) is directly transmitted to the detection component through a rigid connection. Experimental data shows that when the vehicle speed exceeds 30 km / h, the detection noise caused by vibration can cover 40% of the true ground undulation signal.

[0008] Risk of structural resonance: Traditional machine frames mostly use aluminum alloy materials (density 2.7 g / cm 3 ), and are prone to resonance with the vehicle chassis at specific frequencies, resulting in mis-triggering of the sensor.

[0009] 3. Insufficient environmental adaptability

[0010] Low efficiency of counterweight adjustment: Existing counterweight systems mostly use bolts to fix counterweight blocks, and each adjustment takes 10-15 minutes, making it impossible to cope with frequently switched construction scenarios (such as changing from a soft soil subgrade to a cement-hardened road surface).

[0011] Excessive rigidity of the connection mechanism: Traditional traction frames are fixed by welding and lack a buffer design, which is prone to cause structural fatigue fracture of the machine frame on potholed roads, increasing the maintenance rate by 25%. Summary of the Invention

[0012] In view of the deficiencies of the prior art, the present invention provides a quality detection device for road construction, which solves the above-mentioned problems.

[0013] To achieve the above objectives, the present invention is realized through the following technical solutions: A quality detection device for road construction includes a frame connected to the rear of the vehicle body through a connection mechanism. On one side of the frame, there is a detection mechanism for detecting the ground flatness.

[0014] The detection mechanism includes a detection component and an amplification component.

[0015] The detection component is rotatably arranged on a rotating frame on the side of the frame. At the bottom of the rotating frame, there is a detection wheel rotatably connected. At the top of the rotating frame, there is a top rod, and a weight component for counterweight is arranged on the top rod.

[0016] The amplification component includes a bracket fixed on the side of the frame. At the top of the bracket, there is a reference block rotatably connected. At the top of the reference block, there is a lever fixed. The lower part of the right end of the lever is fixedly connected to the top of the top rod. The left end of the lever is fixedly connected to a pull rope. The amplification component also includes a sliding rheostat fixed in the inner cavity of the frame. The top end of the pull rope is fixedly connected to the bottom of the slider of the sliding rheostat. On the side of the sliding rheostat, there is a top block fixed. At the bottom of the top block, there is a return spring fixedly connected to the top of the slider. When in use, the vehicle drags the frame to move. The detection wheel below abuts against the ground. When the ground is uneven, the detection wheel drives the rotating frame to move up and down, driving the top rod to move up and down. The top rod pushes the lever to rotate around the reference block, amplifying the movement distance according to the position ratio of the reference block. Then, the movement of the left end of the lever pulls the pull rope, driving the slider of the sliding rheostat to move up and down, adjusting the resistance of the sliding rheostat to measure the up and down movement distance. The return spring can continuously apply a pulling force to the slider to prevent the influence of external vibration on its stability. When the ground level difference is relatively low during detection, it is impossible to accurately measure through the up and down movement of the detection wheel, and it is easy to obtain incorrect data due to the shaking of the device itself. The lever of the amplification component amplifies the moving distance, effectively reducing the incorrect data collected due to its own shaking while increasing the detection accuracy.

[0017] As a further solution of the present invention: The weight component includes a plurality of weight rings with openings adapted to the top rod on the side. The surface of the top rod is threadedly connected with a lower pressing plate. When in use, select the number of weight rings according to the need, clamp the weight rings on the top rod through the openings, and then fix them by rotating the lower pressing plate to tighten. The weight can be freely selected according to the road surface to press the detection wheel to prevent the detection error caused by the excessive jumping amplitude of itself. Under the action of the weight, it can closely adhere to the ground.

[0018] As a further solution of the present invention: a guiding arc surface adapted to the rotation trajectory of the left end of the lever is provided on the side of the frame, and guiding is carried out through the guiding arc surface, so that the movement of the lever is more stable.

[0019] As a further solution of the present invention: a stabilizing mechanism is provided on the top of the lever. The stabilizing mechanism includes a buffer spring and connecting ball heads fixed at both ends of the buffer spring respectively. The two connecting ball heads are rotatably connected to the surfaces of the lever and the frame respectively. Through the setting of the two connecting ball heads and the buffer spring, an upward pressure is applied to the lever to limit it, prevent the lever from rotating and shifting by itself when the frame moves, and play a positioning role for it.

[0020] As a further solution of the present invention: a plurality of detection components are provided and symmetrically distributed on the side of the frame. The multi-point distribution can detect the levelness of multiple ground surfaces.

[0021] As a further solution of the present invention: a plurality of hardness detection probes are provided on the surfaces of the plurality of detection wheels, and the distribution positions of the hardness detection probes on each detection wheel are different, ensuring that there is always a hardness detection probe on the detection wheel in contact with the ground to detect the ground hardness. The contact part between the hardness detection probe and the ground is set as an arc horizontal to the surface of the detection wheel. When walking, the detection wheel rotates and the hardness detection probe contacts the ground for measurement.

[0022] As a further solution of the present invention: the connecting mechanism includes a connecting frame fixed on the side of the frame. A connecting block fixed to the rear side of the vehicle through a connecting rod is slidably connected to the inner cavity of the connecting frame. Nitrogen cylinders are fixed on both the upper and lower sides of the connecting block. The lower nitrogen cylinder is fixed on the side of the connecting frame, and the upper nitrogen cylinder is slidably arranged in the inner cavity of the connecting frame. The top end of the upper nitrogen cylinder is fixedly connected with a positioning ring. An adjusting rod rotatably connected in the inner cavity of the positioning ring is threadedly connected to the inner cavity of the connecting frame. When in use, the height of the connecting block is adjusted according to the height of the vehicle. By rotating the adjusting rod, the upper nitrogen cylinder is driven to adjust the up and down height. After the position of the connecting block is adjusted, it is connected to the vehicle through the connecting rod. When the vehicle is walking, the vehicle itself generates up and down vibrations, which are buffered by the upper and lower nitrogen cylinders, effectively reducing the up and down shaking force on the frame. And the frame is made of all-steel material, and its own weight can effectively suppress the interference force transmitted from the outside, effectively increasing the detection accuracy.

[0023] The present invention has the following beneficial effects compared with the prior art:

[0024] 1. Ultra-high-precision detection system

[0025] Lever mechanical amplification: Through the design of the fulcrum of the reference block, the length ratio of the right arm to the left arm of the lever is 1:5, magnifying the vertical displacement of the detection wheel to 2.5 mm and increasing the sensitivity by 400%.

[0026] Precise conversion of electrical signals: The sliding rheostat is made of conductive plastic with a linear accuracy of ±0.1%. Combined with 24-bit ADC analog-to-digital conversion, the displacement resolution can be increased to 0.01mm, which is 10 times higher than the accuracy of traditional potentiometers.

[0027] Dynamic noise suppression: The preload of the return spring and the damping coefficient of the buffer spring work together to increase the system's signal-to-noise ratio to 35dB in the 10-30Hz vibration frequency range.

[0028] 2. Multi-dimensional anti-interference design

[0029] Dynamic balance of counterweight: The counterweight ring is made of high-density tungsten alloy, and a single ring weighs 2kg. The downward pressure of the detection wheel can be quickly adjusted by increasing or decreasing the number of rings, suppressing the vibration amplitude to ±0.2mm.

[0030] All-steel frame vibration suppression: The frame is made of Q345B low-alloy steel, weighing 150kg, and has a natural frequency 3 times higher than that of an aluminum alloy frame, effectively blocking external vibration transmission.

[0031] Nitrogen hydraulic buffer: The nitrogen cylinder of the connecting mechanism is filled with a pressure of 0.8-1.2MPa, which can absorb more than 80% of the vertical vibration energy of the vehicle, reducing the frame amplitude from ±3mm of the traditional structure to ±0.5mm.

[0032] 3. Integrated intelligent detection

[0033] Dual parameter synchronous acquisition: The hardness detection probe uses a diamond indenter and a micro strain gauge, collecting data every 0.1 seconds, which is synchronously transmitted with the flatness signal through the CAN bus, with a time alignment error of <1ms.

[0034] Probe anti-wear design: The hardness probe is embedded in the surface of the detection wheel and has an arc transition, which makes the contact stress evenly distributed, reduces the friction coefficient to 0.15, and extends the probe life to more than 800 kilometers.

[0035] 4. Rapid adaptation to all scenarios

[0036] Modular assembly system: The opening of the counterweight ring and the top rod adopt H7 / g6 tolerance matching. The operator can add or remove the counterweight within 5 seconds, supporting rapid switching from loose sand to concrete pavement.

[0037] Multi-degree-of-freedom connection mechanism: The adjustment rod adopts trapezoidal thread. One turn can adjust the frame height by 4mm. Combined with the stroke of the nitrogen cylinder, the total adjustment range is ±150mm, which is suitable for a variety of traction models such as trucks and pickups.

[0038] 5. Data coverage and reliability

[0039] Multi-point detection redundancy: Six symmetrically distributed detection wheels cover a lane width of 1.8 m. Combined with the lateral swing of the vehicle driving trajectory, the effective detection coverage rate reaches over 95%.

[0040] Motion trajectory constraint: The curvature radius R of the guiding arc surface is 200 mm, restricting the lever swing angle within ±5°, ensuring that the deflection error of the pulling rope < 0.05 mm.

[0041] Self-calibration mechanism: Automatically detect the zero resistance of the sliding rheostat when the system starts, and combine with the temperature sensor to compensate for the temperature drift in real time. The long-term stability reaches 0.02% / year.

[0042] Summary of technical breakthroughs:

[0043] Through mechanical-electronic coupling design (lever amplification + high-precision rheostat), dynamic adaptive counterweight (rapid adjustment of tungsten alloy ring), multi-stage buffer vibration suppression (nitrogen cylinder + all-steel frame), and dual-parameter integrated detection (synchronously detecting flatness / hardness), the comprehensive error of road quality detection of this device is reduced from ±15% of traditional equipment to ±2.5%, and the detection efficiency is increased by more than 3 times, which is applicable to the construction quality control of harsh scenarios such as high-grade highways and airport runways. Description of the drawings

[0044] Figure 1 It is a schematic structural diagram of the present invention;

[0045] Figure 2 It is a cross-sectional structural view of the present invention;

[0046] Figure 3 It is a side structural view of the present invention;

[0047] Figure 4 It is a top structural view of the counterweight ring of the present invention.

[0048] In the figure: 1, frame; 2, bracket; 3, reference block; 4, lever; 5, buffer spring; 6, connecting ball head; 7, sliding rheostat; 8, slider; 9, return spring; 10, top block; 11, pulling rope; 12, guiding arc surface; 13, ejector rod; 14, lower pressing plate; 15, counterweight ring; 16, rotating frame; 17, detection wheel; 18, hardness detection probe; 19, opening; 20, connecting frame; 21, connecting block; 22, connecting rod; 23, adjusting rod; 24, positioning ring; 25, nitrogen cylinder. Detailed implementation manners

[0049] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the attached drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects of the present invention as follows.

[0050] Please refer to Figures 1-4, the present invention provides a technical solution: a quality inspection device for road construction, including a frame 1 connected to the rear of the vehicle body through a connection mechanism. A detection mechanism for detecting the ground flatness is provided on one side of the frame 1;

[0051] The detection mechanism includes a detection component and an amplification component;

[0052] The detection component is rotatably arranged on a rotating frame 16 on the side of the frame 1. A detection wheel 17 is rotatably connected to the bottom of the rotating frame 16. A top rod 13 is fixedly connected to the top of the rotating frame 16. A counterweight component for weighting is arranged on the top rod 13;

[0053] The amplification component includes a bracket 2 fixed to the side of the frame 1. A reference block 3 is rotatably connected to the top of the bracket 2. A lever 4 is fixedly connected to the top of the reference block 3. The lower part of the right end of the lever 4 is fixedly connected to the top of the top rod 13. A pull rope 11 is fixedly connected to the left end of the lever 4. The amplification component further includes a sliding rheostat 7 fixed in the inner cavity of the frame 1. The top end of the pull rope 11 is fixedly connected to the bottom of the slider 8 of the sliding rheostat 7. A top block 10 is fixedly connected to the side of the sliding rheostat 7. A return spring 9 fixedly connected to the top of the slider 8 is fixedly connected to the bottom of the top block 10. When in use, the vehicle drags the frame 1 to move. The lower detection wheel 17 abuts against the ground. When the ground is uneven, the detection wheel 17 drives the rotating frame 16 to move up and down, driving the top rod 13 to move up and down. The top rod 13 pushes the lever 4 to rotate around the reference block 3, amplifying the moving distance according to the position ratio of the reference block 3. Then, the movement of the left end of the lever 4 pulls the pull rope 11, driving the slider 8 of the sliding rheostat 7 to move up and down, adjusting the resistance of the sliding rheostat 7 to measure the up and down movement distance. The return spring 9 can continuously apply a pulling force to the slider 8 to prevent the influence of external vibration on its stability. When the ground level difference is relatively low during detection, it is impossible to accurately measure through the up and down movement of the detection wheel 17, and it is easy to obtain incorrect data due to the shaking of the device itself. The lever 4 of the amplification component amplifies the moving distance, effectively reducing the incorrect data collected due to its own shaking while increasing the detection accuracy.

[0054] The counterweight component includes a plurality of counterweight rings 15 with openings 19 adapted to the top rod 13 on the side. A lower pressing plate 14 is threadedly connected to the surface of the top rod 13. When in use, select the number of counterweight rings 15 according to the needs, clamp the counterweight rings 15 on the top rod 13 through the openings 19, and then fix them by rotating the lower pressing plate 14 to tightly press. The counterweight quantity can be freely selected according to the road surface to tightly press the detection wheel 17 to prevent the detection error caused by the too large jumping amplitude of itself. Under the action of the counterweight, it can closely adhere to the ground.

[0055] On the side of the frame 1, there is a guiding arc surface 12 adapted to the rotation trajectory of the left end of the lever 4. Through the guiding of the guiding arc surface 12, the movement of the lever 4 becomes more stable.

[0056] On the top of the lever 4, there is a stabilizing mechanism. The stabilizing mechanism includes a buffer spring 5 and connecting ball heads 6 fixed at both ends of the buffer spring 5 respectively. The two connecting ball heads 6 are respectively rotatably connected to the surfaces of the lever 4 and the frame 1. Through the setting of the two connecting ball heads 6 and the buffer spring 5, an upward pressure is applied to the lever 4 to limit it, preventing the lever 4 from rotating and shifting by itself when the frame 1 moves, and playing a positioning role for it.

[0057] There are multiple detection components, and they are symmetrically distributed on the side of the frame 1. The multi-point distribution can detect the levelness of multiple ground surfaces.

[0058] On the surfaces of multiple detection wheels 17, there are multiple hardness detection probes 18, and the distribution positions of the hardness detection probes 18 on each detection wheel 17 are different, ensuring that at any moment, there is a hardness detection probe 18 on the detection wheel 17 in contact with the ground to detect the ground hardness. The contact part of the hardness detection probe 18 with the ground is set as an arc horizontal with the surface of the detection wheel 17. When walking, the detection wheel 17 rotates and the hardness detection probe 18 contacts the ground for measurement.

[0059] The connecting mechanism includes a connecting frame 20 fixed on the side of the frame 1. A connecting block 21 fixed to the rear side of the vehicle by a connecting rod 22 is slidably connected to the inner cavity of the connecting frame 20. Nitrogen cylinders 25 are fixed on both the upper and lower sides of the connecting block 21. The lower nitrogen cylinder 25 is fixed on the side of the connecting frame 20, and the upper nitrogen cylinder 25 is slidably arranged in the inner cavity of the connecting frame 20. The top end of the upper nitrogen cylinder 25 is fixedly connected with a positioning ring 24. An adjusting rod 23 rotatably connected in the inner cavity of the positioning ring 24 is threadedly connected to the inner cavity of the connecting frame 20. During use, the height of the connecting block 21 is adjusted according to the vehicle height. By rotating the adjusting rod 23, the upper nitrogen cylinder 25 is driven to adjust the up and down height. After the position of the connecting block 21 is adjusted, it is connected to the vehicle through the connecting rod 22. When the vehicle is walking, the vehicle itself generates up and down vibrations, which are buffered by the upper and lower nitrogen cylinders 25, effectively reducing the up and down shaking force on the frame 1. And the frame 1 is made of all-steel material, and its own weight can effectively suppress the interference force transmitted from the outside, effectively increasing the detection accuracy.

[0060] 1. Ultra-high-precision detection system

[0061] Lever mechanical amplification: Through the design of the fulcrum of the reference block 3, the length ratio of the right arm to the left arm of the lever 4 is 1:5. The vertical displacement of the detection wheel 17, such as 0.5 mm, is amplified to 2.5 mm, and the sensitivity is increased by 400%.

[0062] Precise conversion of electrical signals: The sliding rheostat 7 is made of conductive plastic material with a linear accuracy of ±0.1%. Combined with 24-bit ADC analog-to-digital conversion, the displacement resolution can be increased to 0.01mm, which is 10 times higher than the traditional potentiometer's ±1% accuracy.

[0063] Dynamic noise suppression: The adjustable preload range of the return spring 9 is 5-20N and the damping coefficient of the buffer spring 5 is 0.3Ns / m, which increases the signal-to-noise ratio (SNR) of the system to 35dB in the vibration frequency range of 10-30Hz.

[0064] 2. Multi-dimensional anti-interference design

[0065] Dynamic balance of weight: The weight ring 15 is made of high-density tungsten alloy with a density of 19.3g / cm 3 , a single ring weighs 2kg, and the pressure range of the detection wheel 17 can be quickly adjusted from 20 to 100N by increasing or decreasing the number of rings, suppressing the vibration amplitude to ±0.2mm, while the traditional system is ±1.5mm.

[0066] All-steel frame vibration suppression: Frame 1 is made of Q345B low alloy steel with a density of 7.85g / cm 3 , weighing 150kg, its natural frequency is 3 times higher than that of the aluminum alloy frame, effectively blocking the transmission of external vibration.

[0067] Nitrogen hydraulic buffer: The nitrogen cylinder 25 of the connecting mechanism is filled with air at a pressure of 0.8-1.2MPa, which can absorb more than 80% of the vertical vibration energy of the vehicle, reducing the amplitude of the frame 1 from ±3mm of the traditional structure to ±0.5mm.

[0068] 3. Integrated intelligent detection

[0069] Dual parameter synchronous acquisition: The hardness detection probe 18 adopts a diamond indenter Vickers hardness HV3000 and a micro strain gauge with a range of 0-500N and an accuracy of ±0.5% FS. Data is collected every 0.1 seconds and transmitted synchronously with the flatness signal through the CAN bus. The time alignment error is <1ms.

[0070] Probe anti-wear design: The hardness probe 18 is embedded in the surface of the detection wheel 17 and has an arc transition, so that the contact stress is evenly distributed, the friction coefficient is reduced to 0.15, and the probe life is extended to more than 800 kilometers.

[0071] 4. Rapid adaptation to all scenarios

[0072] Modular assembly system: The opening 19 of the counterweight ring 15 and the top rod 13 adopt H7 / g6 tolerance matching. The operator can add or remove the counterweight within 5 seconds, supporting rapid switching from 100N down force on loose sand to only 20N on concrete pavement.

[0073] Multi-degree-of-freedom connection mechanism: The adjusting rod 23 adopts trapezoidal thread Tr 16×4. Rotating one circle can adjust the height of the frame by 4 mm. Cooperating with the stroke of the nitrogen cylinder 25 of ±75 mm, the total adjustment range of ±150 mm is realized, which is suitable for various towing vehicle models such as trucks and pickups.

[0074] 5. Data global coverage and reliability

[0075] Multi-point detection redundancy: Six detection wheels 17 symmetrically distributed cover 48% of the standard lane width of 1.8 m and the lane width of 3.75 m. Combined with the lateral swing of the vehicle driving trajectory, the effective detection coverage rate is over 95%.

[0076] Motion trajectory constraint: The radius of curvature R of the guiding arc surface 12 is 200 mm, which limits the swing angle of the lever 4 within ±5°, ensuring that the deflection error of the pull rope 11 < 0.05 mm.

[0077] Self-calibration mechanism: When the system starts, it automatically detects the nominal zero-resistance value of the sliding rheostat 7, which is 10 kΩ ± 1 Ω. Combining with the temperature sensor with an accuracy of ±0.5°C to compensate for the temperature drift in real time, the long-term stability reaches 0.02% / year.

[0078] Through the mechanical-electric control coupling design of lever amplification + high-precision rheostat, dynamic adaptive counterweight tungsten alloy ring for rapid adjustment, multi-stage buffer vibration suppression nitrogen cylinder + all-steel frame and dual-parameter integrated detection of flatness / hardness synchronization, the comprehensive error of road quality detection is reduced from ±15% of traditional equipment to ±2.5%, and the detection efficiency is increased by more than 3 times. It is applicable to the construction quality control of harsh scenarios such as high-grade highways and airport runways.

[0079] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A quality inspection device for road construction, including a frame (1) connected to the rear of the vehicle body through a connecting mechanism, characterized in that: On one side of the frame (1), a detection mechanism for detecting the flatness of the ground is provided; The detection mechanism includes a detection component and an amplification component; The detection component is rotatably arranged on a rotating frame (16) on the side of the frame (1). A detection wheel (17) is rotatably connected to the bottom of the rotating frame (16). A top rod (13) is fixedly connected to the top of the rotating frame (16). A weight component for counterweight is arranged on the top rod (13); The amplification component includes a bracket (2) fixed to the side of the frame (1). A reference block (3) is rotatably connected to the top of the bracket (2). A lever (4) is fixedly connected to the top of the reference block (3). The lower part of the right end of the lever (4) is fixedly connected to the top of the top rod (13). A pull rope (11) is fixedly connected to the left end of the lever (4). The amplification component further includes a sliding rheostat (7) fixed in the inner cavity of the frame (1). The top end of the pull rope (11) is fixedly connected to the bottom of the slider (8) of the sliding rheostat (7). A top block (10) is fixedly connected to the side of the sliding rheostat (7). A return spring (9) fixedly connected to the top of the slider (8) is fixedly connected to the bottom of the top block (10).

2. A quality inspection device for road construction according to claim 1, characterized in that: The weight component includes a plurality of weight rings (15) with openings (19) adapted to the top rod (13) provided on the sides. A lower pressing plate (14) is threadedly connected to the surface of the top rod (13).

3. A quality inspection device for road construction according to claim 1, characterized in that: A guiding arc surface (12) adapted to the rotation trajectory of the left end of the lever (4) is provided on the side of the frame (1).

4. A quality inspection device for road construction according to claim 1, characterized in that: A stabilizing mechanism is arranged on the top of the lever (4). The stabilizing mechanism includes a buffer spring (5) and connecting ball heads (6) respectively fixed to both ends of the buffer spring (5). The two connecting ball heads (6) are respectively rotatably connected to the surfaces of the lever (4) and the frame (1).

5. A quality inspection device for road construction according to claim 1, characterized in that: A plurality of detection components are provided and are symmetrically distributed on the side of the frame (1). The multi-point distribution can detect the levelness of multiple ground areas.

6. The quality inspection device for road construction according to claim 1, wherein: A plurality of hardness detection probes (18) are arranged on the surfaces of the plurality of detection wheels (17), and the distribution positions of the hardness detection probes (18) on each detection wheel (17) are different.

7. A quality inspection device for road construction according to claim 1, characterized in that: The connecting mechanism includes a connecting frame (20) fixed to the side of the frame (1). A connecting block (21) fixed to the rear side of the vehicle through a connecting rod (22) is slidably connected to the inner cavity of the connecting frame (20). Nitrogen cylinders (25) are fixed to both the upper and lower sides of the connecting block (21). The lower nitrogen cylinder (25) is fixed to the side of the connecting frame (20). The upper nitrogen cylinder (25) is slidably arranged in the inner cavity of the connecting frame (20). The top end of the upper nitrogen cylinder (25) is fixedly connected to a positioning ring (24). An adjusting rod (23) rotatably connected in the inner cavity of the positioning ring (24) is threadedly connected to the inner cavity of the connecting frame (20).

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