An asphalt pavement construction quality nondestructive testing device

Abstract

The present application relates to the technical field of road surface detection device, and specifically relates to a nondestructive testing device for asphalt pavement construction quality, which comprises a detection vehicle frame, a trolley base with wheels installed at the bottom, and a trolley top cover installed above the trolley base; a detection part, a plurality of first-level detection components installed on the trolley base for detecting whether the local gas flow rate of the asphalt pavement is abnormal, and a second-level detection component installed at the bottom of the trolley base, wherein the second-level detection component is provided with a plurality of detection probes; the first-level detection components cooperate with the second-level detection component to realize hierarchical detection; when the first-level detection components detect pavement defects, the second-level detection component is started to perform accurate detection, thereby avoiding the problem that the detection probes participate in detection throughout the whole process and affect the service life, and meanwhile, reliable monitoring accuracy and efficiency are ensured.

Description

Technical Field

[0001] This invention relates to the field of road surface testing equipment technology, and specifically to a non-destructive testing device for asphalt pavement construction quality. Background Technology

[0002] Asphalt concrete is a mixture that flows at high temperatures and hardens at low temperatures. It has good ductility and plasticity at high temperatures, and its strength and stiffness increase as the temperature decreases, eventually forming a dense road surface with a rough surface.

[0003] In the field of asphalt pavement construction quality inspection, traditional methods mainly rely on single detection means or integrated high-precision sensors for full-coverage inspection. However, existing technologies have the following shortcomings: high-cost detection probes (such as three-dimensional laser probes) in existing technologies need to participate in the entire inspection process, which leads to a significant reduction in their service life; in addition, some technologies improve efficiency by reducing the sensor sampling frequency, but may miss minute cracks or local defects; while high-density detection can improve accuracy, it significantly increases the data processing burden and inspection time, and cannot meet the rapid inspection needs of large-area pavements.

[0004] Therefore, it is necessary to maintain reliable detection accuracy in abnormal areas and extend the service life of the detection probe. Thus, it is necessary to establish a graded detection structure so that the precision sensor detection operation can be started only after the abnormal area is confirmed. In view of this, we propose a non-destructive testing device for asphalt pavement construction quality. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section and provide a non-destructive testing device for asphalt pavement construction quality.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A non-destructive testing device for asphalt pavement construction quality includes a testing frame, the testing frame including a trolley base with wheels mounted on its bottom, and a trolley top cover mounted on the trolley base, and further includes: The detection unit includes multiple primary detection components mounted on the trolley base for detecting whether the asphalt pavement is abnormal, and secondary detection components mounted on the bottom of the trolley base, wherein the secondary detection components are equipped with multiple detection probes; When the primary detection component detects an abnormality, the detection probe confirms the abnormal area of ​​the asphalt pavement.

[0007] Preferably, the primary detection component includes an inner cylinder with sliding seats fixedly connected to both ends, and an outer cylinder is rotatably installed outside the inner cylinder; The sliding seat is slidably mounted on the bracket along the vertical groove, and the bracket is fixedly mounted on the bottom surface of the trolley base.

[0008] Preferably, a first gas pipe is connected to the inner cylinder through the sliding seat, and a second gas outlet is provided on the bottom cylinder of the inner cylinder; The outer cylinder is provided with a plurality of first gas outlets for connection with the second gas outlet.

[0009] Preferably, a return spring is installed between the vertical groove wall and the sliding seat; The upper end of the sliding seat on either side is fixedly connected to a first top rod for inserting upward through the bracket body, and a top block is installed on the first top rod.

[0010] Preferably, a pneumatic valve is installed on the trolley base. The pneumatic valve includes a housing in which a valve core is slidably installed, and an air inlet and an exhaust outlet are respectively provided at both ends of the housing. The exhaust port is used to connect with the first air pipe.

[0011] Preferably, a groove for sliding a slider is provided in the middle of the inner cavity of the housing, and the slider is fixedly connected to the valve core. The slider is connected to the groove by a connecting spring. The outer casing is electrically mounted on the outside of the housing, and the button body and the second push rod fixedly connected to the slider are fixedly mounted inside the outer casing.

[0012] Preferably, a second air pump and an air inlet pipe are fixedly installed on the base of the trolley; The exhaust end of the second air pump is connected to the air inlet pipe, and the air inlet is connected to the air inlet pipe through the second air pipe.

[0013] Preferably, the secondary detection component includes a rotating shaft mounted on the bottom of the trolley base, and multiple frames for mounting the detection probes are connected around the rotating shaft; A rotary motor for coaxially connecting the rotating shaft is mounted on the base of the trolley.

[0014] Preferably, a second support plate is fixedly installed on the trolley base, a first air pump is fixedly installed on the second support plate, and a blowing and cleaning nozzle is installed at the bottom of the trolley base; The exhaust end of the first air pump is electrically connected to the purging and cleaning nozzle.

[0015] Preferably, the second support plate is provided with a start button, which corresponds one-to-one with the top block, and the start button is electrically connected to the first air pump.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This non-destructive testing device for asphalt pavement construction quality enables graded testing through a primary testing component and a secondary testing component within the testing department. When the primary testing component detects abnormalities in the pavement, the secondary testing component is then activated for precise testing. This avoids the problem of the testing probe being involved in the entire testing process, which would affect its service life, while ensuring reliable monitoring accuracy and efficiency. This device innovatively transforms pavement defects into conditions of airflow velocity changes, which can more intuitively reflect the defects in pavement construction quality. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom part of the device of the present invention; Figure 3 This is a schematic diagram of the structure of the device of the present invention after the top cover of the trolley is removed; Figure 4 This is a schematic diagram of the device of the present invention with the first support plate and the second support plate removed; Figure 5 This is a schematic diagram of the structure of the primary detection component of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the structure of the primary detection component of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the inner cylinder structure of the present invention; Figure 8 This is a schematic diagram of the pneumatic valve structure of the present invention.

[0018] The meanings of the labels in the diagram are as follows: 10. Inspection frame; 11. Car base; 12. Car roof; 13. Protective beam; 14. Guard plate; 15. Wheels; 16. Drive motor; 17. First support plate; 18. Second support plate; 181. Start button; 19. First air pump; 20. Primary detection component; 21. Outer cylinder; 211. First gas outlet; 22. Bracket; 201. Vertical slot; 221. Sliding seat; 222. Bearing; 223. Fixed seat; 23. First trachea; 231. Second trachea; 232. Wire; 24. Return spring; 25. First push rod; 26. Push block; 27. Pressure valve; 271. Housing; 272. Outer shell; 273. Valve core; 274. Slider; 275. Connecting spring; 276. Second push rod; 277. Button body; 278. Air inlet; 279. Exhaust port; 28. Inner cylinder; 281. Second gas outlet; 30. Secondary detection component; 31. Rotary shaft; 32. Frame; 33. Detection probe; 34. Rotary motor; 40. Purge and cleaning nozzle; 50. Data storage device; 60. Controller; 70. Second air pump; 71. Air inlet pipe. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-8 The present invention will describe the above technical solution in detail through the following embodiments: The non-destructive testing device for asphalt pavement construction quality in this embodiment includes a testing vehicle frame 10. The bottom of the vehicle base 11 is driven by a drive motor 16 to move the wheels 15 along the asphalt pavement. A vehicle top cover 12 is installed above the vehicle base 11 for protection. Meanwhile, protective beams 13 and guard plates 14 are installed on the front and around the vehicle base 11, respectively.

[0021] It also includes the testing department, including, for example Figure 2 , Figures 5-7 The five primary detection components 20 shown are mounted on the trolley base 11 to detect whether the local gas flow velocity on the asphalt pavement is abnormal, and as shown in the figure. Figure 2 The secondary detection component 30 is shown installed at the bottom of the trolley base 11.

[0022] Specifically, such as Figures 5-7The primary detection component 20 in this embodiment includes an inner cylinder 28 with sliding seats 221 fixedly connected to both ends, and an outer cylinder 21 rotatably mounted on the outside of the inner cylinder 28. It should be noted that in this example, a bearing 222 is installed at the center of the sliding seat 221, and hollow shafts on both sides of the outer cylinder 21 are mounted on the bearings 222 for rotation, reducing rotational friction resistance. Shafts for inserting into the hollow shafts are fixedly connected to both sides of the inner cylinder 28, and a fixed seat 223 is also installed on one side of the sliding seat 221, with the shafts connected to the fixed seat 223 for fixation. In this embodiment, to blow flowing air into the inner cylinder 28, a first air pipe 23 is connected through the sliding seat 221, and a second gas outlet 281 is provided on the bottom of the inner cylinder 28. Figure 7 As shown, the outer cylinder 21 is provided with a plurality of evenly distributed first gas outlets 211 for corresponding to and communicating with the second gas outlet 281. When the outer cylinder 21 and the inner cylinder 28 are relatively displaced to the point that the first gas outlet 211 and the second gas outlet 281 are aligned, airflow will be discharged. In order to cope with the uneven road surface, the sliding seat 221 is slidably installed on the bracket 22 along the vertical groove 201. The bracket 22 is fixedly installed on the bottom surface of the trolley base 11. A return spring 24 is installed between the groove wall of the vertical groove 201 and the sliding seat 221. A first push rod 25 for inserting upward through the bracket 22 is fixedly connected to the upper end of one side of the sliding seat 221. A top block 26 is installed on the first push rod 25.

[0023] When conducting asphalt pavement testing, the testing trolley 10 is first driven by wheels 15 to move along the asphalt pavement. As the trolley 10 moves, the outer cylinder 21 is driven by a motor to rotate at a constant speed outside the inner cylinder 28. Gas is introduced into the inner cylinder 28 through the first air pipe 23. When the first gas outlet 211 on the surface of the outer cylinder 21 rotates to directly downwards and connects with the second gas outlet 281, the gas inside the inner cylinder 28 is discharged and blown vertically toward the pavement. It should be noted that because the asphalt surface is rough, its surface texture depth is generally 0.5-1.2 mm. Furthermore, the asphalt pores are not interconnected, so the airflow resistance is high and the gas velocity is low when the gas is discharged and blown into the voids of the dense road surface. However, when the gas velocity increases, it indicates that the outer cylinder 21 has encountered an abnormal road surface. In this embodiment, the abnormal road surface includes defects that reduce resistance, such as cracked road surface and pothole road surface. Subsequently, the secondary detection component 30 is activated to perform local precise detection on the asphalt road surface, thereby improving the accuracy of abnormal detection of the asphalt road surface and shortening the service life of the secondary detection component 30, thus improving the service life and overall detection accuracy of the secondary detection component 30.

[0024] It is important to note that when the outer cylinder 21 encounters a defective or cracked road surface, the gas is discharged and enters the crack, resulting in an increased outflow velocity compared to a normal, dense road surface. When the outer cylinder 21 encounters a pothole or raised road surface, the outer cylinder 21 cannot fit snugly against the road surface, and the gap becomes larger, resulting in an increased airflow velocity. In this embodiment, the spacing of the first gas outlets 211 can be set according to actual use. For roads with high density, the distribution spacing between the first gas outlets 211 can be reduced.

[0025] In this application, the secondary detection component 30 is equipped with multiple ultrasonic probes as detection probes 33. Other embodiments include, but are not limited to, existing detection devices such as three-dimensional laser probes and cameras. It also includes a rotating shaft 31 installed at the bottom of the trolley base 11. Three frames 32 for mounting the detection probes 33 are connected around the rotating shaft 31. A rotary motor 34 for coaxially connecting the rotating shaft 31 is installed on the trolley base 11. When the primary detection component 20 detects an abnormal area, the detection trolley 10 continues to move. After the secondary detection component 30 moves directly above the abnormal area, the secondary detection component 30 is activated. The rotating shaft 31 drives the frames 32 to rotate, causing the frames 32 to drive the detection probes 33 to rotate, thereby performing a secondary detection of the asphalt pavement within the detection range. It should be noted that in this embodiment, with the position of the primary detection component 20 as the baseline, when the secondary detection component 30 moves directly above the abnormal area, the rotating shaft 31 is located directly above the baseline. The circular area with the rotating shaft 31 as the center and the frames 32 as the radius is the detection range of the secondary detection mechanism 30.

[0026] It should be noted that in order to promptly detect abnormal areas through changes in airflow, such as Figures 4-8 As shown in the structure, in this embodiment, a pneumatic valve 27 is installed on the trolley base 11. The pneumatic valve 27 includes a housing 271 in which a valve core 273 is slidably installed. The valve core 273 allows airflow, and the housing 271 has an air inlet 278 and an exhaust outlet 279 at both ends, respectively. Figure 8 The structure shown has a groove in the middle of the inner cavity of the housing 271 for sliding the slider 274, and the slider 274 is fixedly connected to the valve core 273. The slider 274 is connected to the groove through a connecting spring 275. The outer shell 272 is installed outside the housing 271. The button body 277 and the second push rod 276 fixedly connected to the slider 274 are fixedly installed inside the outer shell 272. In this embodiment, the trolley base 11 is also fixedly installed with a second air pump 70 and an air inlet pipe 71. The exhaust port 279 is connected to the first air pipe 23, the exhaust end of the second air pump 70 is connected to the air inlet pipe 71, and the air inlet 278 is connected to the air inlet pipe 71 through the second air pipe 231.

[0027] It should be explained that when gas enters the housing 271, the valve core 273 will shift relative to its initial position. When the gas flow rate is low, the shift of the valve core 273 is small; when the gas flow rate is high, the shift of the valve core 273 becomes larger, increasing the compression of the connecting spring 275. The housing 272 contains a second push rod 276 and a button 277. An abnormal road surface causes the valve core 273 to shift more, causing the slider 274 to move the second push rod 276, which then presses the button 277, closing it. In this embodiment, for better signal transmission and collection, a controller 60 (using existing technology) is also fixedly installed on the trolley base 11. The controller 60 is electrically connected to the rotary motor 34 and also electrically connected to the button 277 via a wire 232. The connection is made by laying wire 232 on the first support plate 17 on the trolley base 11. The controller 60 includes a signal acquisition unit, a data processing unit, and a delay control unit. The signal acquisition unit is used to acquire the status signal of button 277, which includes open and closed states. The data processing unit can calculate the continued driving time of the detection trolley 10 when the status signal of button 277 is closed. The continued driving time of the detection trolley 10 is the time required for the secondary detection component 30 to move directly above the baseline. The continued driving time can be calculated based on the distance between the rotating shaft 31 and the baseline and the driving speed of the detection trolley 10. The delay control unit sends a start signal to the rotary motor 34 when the continued driving time ends to control the rotary motor 34 to start.

[0028] like Figures 3-5 As shown, a second support plate 18 is fixedly installed on the trolley base 11, and a first air pump 19 is fixedly installed on the second support plate 18. A purging nozzle 40 is installed at the bottom of the trolley base 11. The exhaust end of the first air pump 19 is electrically connected to the purging nozzle 40. A start button 181 is provided on the second support plate 18. The start button 181 corresponds to the top block 26 one by one. The start button 181 is electrically connected to the first air pump 19. When the detection trolley 10 encounters a raised road surface, the outer cylinder 21 is squeezed and rises by the road surface protrusion. The sliding seat 221 drives the first top rod 25 to rise, which in turn drives the top block 26 to squeeze the start button 181, so that the start button 181 controls the first air pump 19 to start. After the first air pump 19 starts, it supplies air to the purging nozzle 40. During the asphalt pavement detection process, road gravel may cause the detection device to misjudge that there is an abnormal protrusion on the road surface. In this embodiment, the road surface is cleaned by using the purging nozzle to avoid the road gravel affecting the detection results.

[0029] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A non-destructive testing device for asphalt pavement construction quality, comprising a testing frame (10), the testing frame (10) comprising a trolley base (11) with wheels (15) mounted on its bottom, and a trolley top cover (12) mounted on the trolley base (11), characterized in that: include: The detection unit includes multiple primary detection components (20) installed on the trolley base (11) for detecting whether the asphalt pavement is abnormal, and a secondary detection component (30) installed at the bottom of the trolley base (11). The secondary detection component (30) is provided with multiple detection probes (33). When the first-level detection component (20) detects an abnormality, the detection probe (33) detects and confirms the abnormal area of ​​the asphalt pavement. The primary detection component (20) includes an inner cylinder (28) with sliding seats (221) fixedly connected at both ends, and an outer cylinder (21) is rotatably installed on the outside of the inner cylinder (28). The sliding seat (221) is slidably mounted on the bracket (22) along the vertical groove (201), and the bracket (22) is fixedly mounted on the bottom surface of the trolley base (11); The inner cylinder (28) is connected to a first gas pipe (23) via the sliding seat (221), and a second gas outlet (281) is provided on the bottom cylinder of the inner cylinder (28). The outer cylinder (21) is provided with a plurality of first gas outlets (211) for corresponding to and communicating with the second gas outlet (281). A return spring (24) is installed between the wall of the vertical groove (201) and the sliding seat (221); a first top rod (25) for inserting upward through the frame of the bracket (22) is fixedly connected to the upper end of the sliding seat (221) on either side, and a top block (26) is installed on the first top rod (25). A pneumatic valve (27) is installed on the base (11) of the trolley. The pneumatic valve (27) includes a housing (271) in which a valve core (273) is slidably installed. An air inlet (278) and an exhaust outlet (279) are respectively provided at both ends of the housing (271). The exhaust outlet (279) is used to communicate with the first air pipe (23). The housing (271) has a groove in the middle of its inner cavity for sliding mounting of a slider (274), and the slider (274) is fixedly connected to the valve core (273). The slider (274) is connected to the groove by a connecting spring (275). The outer shell (272) is externally connected to the housing (271), and the button body (277) and the second push rod (276) are fixedly installed inside the outer shell (272) and fixedly connected to the slider (274).

2. The non-destructive testing device for asphalt pavement construction quality as described in claim 1, characterized in that: A second air pump (70) and an air inlet pipe (71) are fixedly installed on the base (11) of the trolley. The exhaust end of the second air pump (70) is connected to the air inlet pipe (71), and the air inlet (278) is connected to the air inlet pipe (71) through the second air pipe (231).

3. The non-destructive testing device for asphalt pavement construction quality as described in claim 1, characterized in that: The secondary detection component (30) includes a rotating shaft (31) installed at the bottom of the trolley base (11), and a plurality of frames (32) for mounting the detection probe (33) are connected around the rotating shaft (31). A rotary motor (34) for coaxially connecting the rotating shaft (31) is installed on the trolley base (11).

4. The non-destructive testing device for asphalt pavement construction quality as described in claim 1, characterized in that: A second support plate (18) is fixedly installed on the trolley base (11), a first air pump (19) is fixedly installed on the second support plate (18), and a blow-cleaning nozzle (40) is installed at the bottom of the trolley base (11). The exhaust end of the first air pump (19) is connected to the blow-cleaning nozzle (40).

5. The non-destructive testing device for asphalt pavement construction quality as described in claim 4, characterized in that: The second support plate (18) is provided with a start button (181), which corresponds to the top block (26) one by one, and the start button (181) is electrically connected to the first air pump (19).

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