Asphalt pavement detection device

Abstract

The invention provides an asphalt pavement detection device, which comprises: a shell, the four corners of the bottom end of the shell are all provided with universal pulleys, and the center of the bottom end is provided with a detection port; the number of the partition plates is two, and the partition plates are sequentially arranged in the shell and divide the interior of the shell into three cavities. The lifting detection mechanism is arranged in the lowermost cavity in the shell, and a detection part on the lifting detection mechanism can penetrate out of the detection opening to detect the asphalt pavement below the lifting detection mechanism; the battery is arranged in the shell and is placed on one of the partition plates; the data processor is arranged in the shell and is placed on the other partition plate; and the control and display panel is arranged at the top of the shell. Through the lifting detection mechanism, a detection part can automatically stretch out of a detection opening, detection data are processed through the data processor, a result is displayed through the control and display panel, and through the design, the automation level of detection is greatly improved, manual intervention is reduced, and the detection efficiency and precision are improved.

Description

Technical Field

[0001] The invention relates to the field of road surface detection, and in particular to an asphalt road surface detection device. Background Art

[0002] Asphalt pavement is an important part of highways and urban roads, and its construction quality directly affects the service life of the road and driving safety. In the process of asphalt pavement construction, compaction and thickness are key quality control indicators. Traditional detection methods mainly rely on manual operation, using compaction meters, nuclear density meters, core drilling methods and other tools for detection. These methods are not only cumbersome to operate and have low detection efficiency, but also time-consuming and labor-intensive for the detection of large-area roads, and it is difficult to achieve full coverage and high-precision detection. Therefore, it is particularly important to develop an efficient, convenient and accurate fully automatic asphalt pavement compaction and thickness detection device. In the prior art, although there are some automated detection devices, the detection efficiency is low, and many devices rely on manual operation of sensors, with slow detection speeds, which cannot meet the needs of rapid detection of large-area roads. Therefore, an asphalt pavement detection device is proposed to solve the above problems. Summary of the invention

[0003] The main purpose of the present invention is to provide an asphalt pavement detection device to solve the problem that although there are some automated detection devices, the detection efficiency is low, many devices rely on manual sensor operation, the detection speed is slow, and it cannot meet the rapid detection needs of large-area roads.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an asphalt pavement detection device, comprising:

[0005] The housing has pulleys at the four corners of the bottom of the housing, and a detection port is provided at the center of the bottom;

[0006] Two partitions are arranged in the shell in sequence to separate the interior of the shell into three chambers;

[0007] The lifting detection mechanism is built into the lowest chamber inside the shell, and the detection part on it can pass through the detection port to detect the asphalt road surface below;

[0008] A battery is built into the housing and placed on one of the partitions;

[0009] A data processor is built into the housing and placed on another partition;

[0010] A control and display panel is arranged on the top of the housing;

[0011] The detection part, the battery, the data processor and the control and display panel are electrically connected.

[0012] In the preferred embodiment, the lifting detection mechanism includes two symmetrically arranged vertical poles and a telescopic electric cylinder, the two ends of the vertical poles are respectively connected to the bottom of the partition located below and the inner bottom wall of the shell, the fixed end of the telescopic electric cylinder is connected to the bottom of the partition located below, and the telescopic end is connected to the detection part, and the top of the detection part is provided with two sliding parts respectively connected to the two vertical poles in a slidable manner;

[0013] The detection part comprises a detection box with an opening at the bottom, a supporting plate is arranged in the detection box, and an ultrasonic sensor and a temperature sensor with a detection end facing downward are penetrated on the supporting plate.

[0014] In a preferred embodiment, the detection method comprises:

[0015] S1, data collection, transmitting ultrasonic signals to the asphalt pavement through ultrasonic sensors and receiving reflected signals, and using temperature sensors to measure the current temperature of the asphalt pavement for temperature compensation;

[0016] S2, signal processing, bandpass filtering is performed on the received ultrasonic signal to filter out irrelevant frequencies and retain the target frequency band signal, and then the spectrum is analyzed using fast Fourier transform to separate the effective signal, and the wavelet denoising algorithm and Kalman filter algorithm are used to remove environmental noise and smooth the signal, and then the sliding window algorithm is used to detect the echo peak, and the effective peak is screened out through threshold judgment;

[0017] S3, temperature compensation, use the compensation formula to calculate the actual propagation speed of the ultrasonic wave according to the current temperature. The formula is:

[0018] V(T)=V0·(1+α·(T-T0));

[0019] Where: V(T) is the actual propagation speed of ultrasound;

[0020] T is the current temperature of the asphalt surface;

[0021] V0 is the speed of sound at the reference temperature T0;

[0022] α is the temperature compensation coefficient, which is determined by experimental data;

[0023] S4. Thickness and density calculation: The thickness d of the asphalt layer is calculated based on the time difference t between ultrasonic emission and reception and the sound velocity V(T) after temperature compensation. The formula is:

[0024] d = V(T)·t;

[0025] Based on the density formula:

[0026] ρ=E / (K 2 ·V(T) 2 );

[0027] The density ρ of asphalt is calculated using the elastic modulus E and the speed of sound V(T) of the material;

[0028] Through density ρ and maximum dry density ρ c The ratio of the compaction degree K = ρ / ρ c ;

[0029] S5. Calibration process: regularly calibrate the signal according to the standard sample with known thickness and density to ensure the peak detection accuracy of the echo signal. Measure the sound velocity of the standard material under different temperature conditions, fit the temperature compensation coefficient α and the reference sound velocity V0, and use the material elastic modulus E and maximum dry density ρ obtained in the laboratory. c , update the density calculation reference value.

[0030] In a preferred embodiment, the shell includes a bottom shell, and an inner shell and an outer shell arranged on the top of the bottom shell, the bottoms of the inner shell and the outer shell are both open, wherein the outer shell is mounted on the outside of the inner shell, and an insulating cavity is arranged between the two, the lifting detection mechanism, battery, partition and data processor are all arranged in the inner shell, and the control and display panel is arranged on the top of the outer shell.

[0031] In the preferred embodiment, aerogel felt is provided on the inner side of the outer shell, and the inner shell is composed of five panels. The panels and partitions are provided with cavities inside, and multiple isolation plates are provided in the cavity to isolate the cavity into multiple chambers, each of which is encapsulated with phase change material.

[0032] In a preferred embodiment, the bottom shell is composed of a lower plate and an upper plate, wherein the lower plate includes a lower plate body, a lower opening is provided at the center of the lower plate body, a support frame extending upward is provided at the edge of the lower opening, a lower docking frame extending upward is provided at the edge of the lower plate body, and an aerogel felt is also provided on the top of the lower plate body;

[0033] The upper plate member includes an upper plate body, an upper opening matching the lower opening is arranged at the center of the upper plate body, an upper docking frame extending downward and corresponding to the lower docking frame is arranged at the edge of the upper plate body, the contact surface of the upper docking frame and the lower docking frame are matching wedge-shaped, and the two are fixed by screws;

[0034] When the lower plate and the upper plate are connected, a heat-insulating cavity is formed between the two, and the lower opening and the upper opening form a detection port.

[0035] In the preferred embodiment, the upper plate also includes an outer shell docking frame and an inner shell docking frame arranged on the top, the outer shell docking frame and the inner shell docking frame respectively correspond to the bottom ends of the outer shell and the inner shell, and the contact surfaces are matching wedge shapes and are fixed by screws.

[0036] In the preferred embodiment, a spirally arranged water-cooling pipe is also provided in the insulating cavity between the outer shell and the inner shell, and a water-cooling circulation assembly is provided on the top of the outer shell, which includes a circulation pump, a water tank and a radiator. The water inlet of the water-cooling pipe is connected to the output end of the circulation pump, the water outlet is connected to the input end of the radiator, the output end of the radiator is connected to the inlet of the water tank, and the outlet of the water tank is connected to the input end of the circulation pump through a pipeline.

[0037] In the preferred embodiment, a plurality of heat transfer racks connected to the water cooling pipes are arranged on the outer side of the panel on the side of the inner shell, and the heat transfer racks include an inverted "L"-shaped support rack arranged on the outer side of the panel, an arc groove adapted to the water cooling pipe is arranged on the top of the support rack, and a plurality of oblique supports are arranged at the inner corners of the support rack;

[0038] Temperature sensors are arranged in the heat-insulating cavity between the outer shell and the inner shell, and in the inner shell.

[0039] In the preferred embodiment, the pulley includes an extension block arranged at the bottom corner of the housing, the bottom of the extension block is provided with a pulley body, and the top of the extension block is provided with a locking component that can penetrate and lock the pulley body;

[0040] The main body of the pulley includes a fixed plate, a pulley frame and a pulley. The pulley is rotatably arranged in the pulley frame. A rotating shaft is arranged on the top of the pulley frame. The top of the rotating shaft passes through the bearing at the center of the fixed plate and is connected to the limit plate. A locking hole is arranged on the top of the rotating shaft. A continuous arc-shaped slot is arranged on the side wall of the locking hole, and the top of the arc-shaped slot is horn-shaped.

[0041] A telescopic hole is arranged at the center of the extension block, and a telescopic slot with an open lower end is arranged on the side wall of the telescopic hole, and the telescopic slot has the same size as the arc-shaped slot;

[0042] The locking component comprises a fixing piece arranged at the top of the extension block, the fixing piece is provided with a center hole which is the same as the telescopic hole, the top of the center hole is provided with a sleeve whose inner diameter is larger than the diameter thereof, the top of the sleeve is provided with a clamping ring whose inner diameter is smaller than the diameter thereof, a notch is provided on the inner side of the clamping ring, the telescopic hole, the center hole, the sleeve and the clamping ring are telescopically plugged with a locking piece, the locking piece comprises a telescopic rod plugged in the telescopic hole, the center hole, the sleeve and the clamping ring, the outer side of the bottom end of the telescopic rod is provided with a convex column which is adapted to the telescopic groove and the arc-shaped clamping groove, the convex column is movably arranged in the telescopic groove, the top of the telescopic rod is provided with a connecting port, the side wall of the connecting port is provided with a rotating groove which penetrates the connecting port, a connecting shaft is rotatably plugged in the connecting port, a rotating locking block which penetrates the rotating groove is provided on the outer side of the connecting shaft, the length of the rotating groove is at least twice that of the rotating locking block, the top of the connecting shaft is connected with a T-shaped shaft, and a reset spring which is sleeved on the T-shaped shaft and the outside of the telescopic rod is provided between the T-shaped shaft and the fixing piece;

[0043] When the telescopic rod is completely inserted into the locking hole, the top end of the protruding column is located in the telescopic groove, and the rotating locking block is located below the clamping ring.

[0044] The present invention provides an asphalt pavement detection device. Through a lifting detection mechanism, a detection component can be automatically extended from a detection port to realize automatic detection of the asphalt pavement. The detection data is processed by a data processor, and the results are displayed through a control and display panel. This design greatly improves the automation level of the detection, reduces manual intervention, and improves the detection efficiency and accuracy. At the same time, through the high-precision signal processing, temperature compensation, and density calculation of the ultrasonic sensor, the influence of temperature changes on the measurement results can be effectively avoided, and more accurate asphalt pavement thickness and compaction data can be provided. Secondly, the double-layer structure of the inner and outer shells, the application of aerogel and phase change materials, and the introduction of a water cooling system significantly improve the thermal management performance of the device, effectively isolate external heat, and dissipate the internally generated heat through a water cooling pipe, ensuring that the device can still work stably in a high temperature environment and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0046] Figure 1 is a structural diagram of a first embodiment of a housing of the present invention;

[0047] Figure 2 The present invention Figure 1 Half-section structure diagram;

[0048] Figure 3 This is a half-section structural diagram of the detection part of the present invention;

[0049] Figure 4 is a half-section structural diagram of a second embodiment of a housing of the present invention;

[0050] Figure 5 This is a half-section exploded structural diagram of the inner shell of the present invention;

[0051] Figure 6 It is a structural diagram of the lower plate of the present invention;

[0052] Figure 7 It is a structural diagram of the upper plate of the present invention;

[0053] Figure 8 The present invention Figure 4 Look at the structural diagram;

[0054] Fig. 9 is a half-section structural diagram of a third embodiment of a housing of the present invention;

[0055] Fig.10 It is a structural diagram of the water cooling cycle component of the present invention;

[0056] Fig.11 The present invention Fig. 9 Exploded structure diagram;

[0057] Fig.12 It is a structural diagram of the heat transfer frame of the present invention;

[0058] Fig.13 It is a structural diagram of the ten thousand pulley of the present invention;

[0059] Fig.14 This is a main structural diagram of the pulley of the present invention;

[0060] Fig.15 This is a half-section structural diagram of the extension block of the present invention;

[0061] Fig.16 It is a structural diagram of the fixing member of the present invention;

[0062] Fig.17 It is a structural diagram of the locking member of the present invention;

[0063] Fig.18 This is an exploded structural diagram of the locking member of the present invention;

[0064] Fig.19 This is a structural diagram of the connection between the fixing member and the locking member of the present invention;

[0065] Fig. 20 This is a half-section structural diagram of the locking member of the present invention in an unlocked state;

[0066] Fig.21 This is a half-section structural diagram of the locking member of the present invention in a locked state;

[0067] In the figure: shell 1; bottom shell 10; lower plate 100; lower plate body 1000; lower opening 1001; support frame 1002; lower docking frame 1003; upper plate 101; upper plate body 1010; upper opening 1011; upper docking frame 1012; outer shell docking frame 1013; inner shell docking frame 1014; outer shell 11; aerogel felt 110, inner shell 12; panel 120; cavity 121; isolation plate 122; phase change material 123; water cooling pipe 13; water cooling circulation component 14; water tank 140; radiator 141; circulation pump 142; pipeline 143; heat conduction frame 15; support frame 150; arc groove 151; inclined support 152; detection port 2; lifting detection mechanism 3; vertical pole 301; telescopic electric cylinder 302; Detection unit 303; detection box 3030; supporting plate 3031; ultrasonic sensor 3032; temperature sensor 3033; sliding unit 304; battery 4; partition 5; data processor 6; control and display panel 7; pulley 8; extension block 80; telescopic hole 801; telescopic slot 802; pulley body 81; fixing plate 810; pulley frame 811; pulley 812; rotating shaft 813; limiting plate 814; arc-shaped slot 815; locking hole 816; locking component 82; fixing piece 820; center hole 821; sleeve 822; snap ring 823; notch 824; telescopic rod 825; boss 826; connecting port 827; rotating slot 828; T-shaped shaft 829; connecting shaft 830; rotating lock block 831; reset spring 832. DETAILED DESCRIPTION

[0068] Example 1

[0069] like Figure 1-3 As shown, an asphalt pavement detection device includes:

[0070] The shell 1 has pulleys 8 at the four corners of the bottom of the shell 1, and a detection port 2 is arranged at the center of the bottom, so that the device can be easily moved on the asphalt road surface through the pulleys 8.

[0071] The partitions 5, two in number, are sequentially arranged in the shell 1 to separate the interior of the shell 1 into three chambers for placing different mechanisms and appropriately isolating the heat entering from below.

[0072] The lifting detection mechanism 3 is built into the lowest chamber inside the shell 1, and the detection part 303 thereon can pass through the detection port 2 to detect the asphalt road surface below. At the same time, when not detecting, the detection part 303 can be stored in the shell 1 to play a protective role.

[0073] The battery 4 is built into the housing 1 and placed on one of the partitions 5 to provide power to the device. The partition 5 can keep the battery 4 away from the temperature transmitted by the asphalt.

[0074] The data processor 6 is built into the shell 1 and placed on another partition 5. It is used to process the collected data. It can be a digital signal processor, a small industrial PC or a single-board computer, etc. It is also equipped with a memory. This is a prior art and therefore will not be described in detail here. In addition, in the present embodiment, the data processor 6 is placed on the top partition 5 so as to be as far away from the temperature transmitted by the asphalt as possible.

[0075] The control and display panel 7 is arranged on the top of the housing 1, so that the operator can view the test results and set the test parameters. The panel integrates touch buttons and a display screen to provide an intuitive human-computer interaction interface. In this embodiment, the control and display panel 7 is a touch display.

[0076] It should be noted that the detection unit 303, the battery 4, the data processor 6 and the control and display panel 7 are electrically connected, and holes for threading are provided on the housing 1 and the partition 5.

[0077] With such a design, during detection, the detection part 303 can be automatically extended from the detection port 2 through the lifting detection mechanism 3, and the asphalt pavement at the location can be detected, and then the detection data is transmitted to the data processor 6 for processing, and finally the detection structure is displayed through the control and display panel 7, thereby achieving the effect of fully automatic detection.

[0078] In the preferred embodiment, the lifting detection mechanism 3 includes two symmetrically arranged vertical poles 301 and a telescopic electric cylinder 302. The two ends of the vertical poles 301 are respectively connected to the bottom of the partition 5 located below and the inner bottom wall of the shell 1. The fixed end of the telescopic electric cylinder 302 is connected to the bottom of the partition 5 located below, and the telescopic end is connected to the detection part 303. The top of the detection part 303 is provided with two sliding parts 304 that are slidably connected to the two vertical poles 301 respectively. In this embodiment, the sliding part 304 is an inverted "L" shape, and its end is slidably mounted on the outside of the vertical pole 301 through a groove, so that the sliding part 304 can slide on the vertical pole 301 to make the lifting and lowering of the detection part 303 more stable. In addition, the two vertical poles 301 can also play a role in supporting the lowest partition 5.

[0079] The detection part 303 includes a detection box 3030 with an open bottom. The size of the detection box 3030 is adapted to the size of the detection port 2. A supporting plate 3031 is fixedly provided in the detection box 3030. An ultrasonic sensor 3032 and a temperature sensor 3033 with a detection end facing downward are penetrated on the supporting plate 3031. In the present embodiment, there are two groups of ultrasonic sensors 3032. Each group of ultrasonic sensors 3032 has the function of transmitting and receiving ultrasonic waves. The temperature sensor 3033 is arranged between the two groups of ultrasonic sensors 3032.

[0080] In addition, the data processor 6 is also equipped with an analog-to-digital converter for converting the analog signals of the ultrasonic sensor and the temperature sensor into digital signals for use by the MCU or DSP.

[0081] With such a design, the asphalt pavement can be detected by the ultrasonic wave emitted by the ultrasonic sensor 3032, and the real-time temperature can be detected by the temperature sensor 3033, and temperature compensation can be added to improve the accuracy of the detection. The temperature sensor 3033 in this embodiment is an infrared temperature sensor.

[0082] Furthermore, the detection method includes:

[0083] S1. Data collection: an ultrasonic sensor 3032 is used to transmit an ultrasonic signal to the asphalt pavement and receive the reflected signal. At the same time, a temperature sensor 3033 is used to measure the current temperature of the asphalt pavement for temperature compensation.

[0084] S2. Signal processing: bandpass filtering is performed on the received ultrasonic signal to filter out irrelevant frequencies and retain the target frequency band signal. The bandpass filter only allows frequencies within a certain range to pass through, while attenuating signals of other frequencies. Low-frequency (such as environmental vibration) and high-frequency (such as electromagnetic interference) noise are removed, and the signal bandwidth is concentrated in the target ultrasonic frequency band, thereby improving the clarity of the signal. The passband width of the filter should be determined according to the operating frequency of the ultrasonic sensor. For example, if the operating frequency of the sensor is 40kHz, the bandpass filter can be set to a bandwidth of 38-42kHz.

[0085] Then use fast Fourier transform to analyze the spectrum and separate the effective signal. Use fast Fourier transform to convert the time domain signal into frequency domain, so that the intensity of each frequency component in the signal can be intuitively identified. By viewing the spectrum diagram, the ultrasonic echo frequency peak can be determined and possible interference frequencies can be identified. If multiple peaks are found in the spectrum diagram, fast Fourier transform spectrum analysis can more easily distinguish the main frequency position of the target ultrasonic echo signal, thereby determining the most likely echo peak.

[0086] Wavelet denoising algorithm and Kalman filtering algorithm are used to remove environmental noise and smooth the signal. Through wavelet transform, the signal is decomposed into different scales, noise is removed at each scale, and finally reconstructed. Wavelet denoising selectively retains the detail coefficients on the scale related to the signal and filters out the noise components on other scales, thereby reducing the influence of white noise and transient interference, so as to remove high-frequency random noise and retain the characteristics of the echo signal. The Kalman filtering algorithm uses the dynamic model of the signal and the statistical characteristics of noise to estimate the smoothing value of the signal. Through the prediction-update process, the Kalman filter performs real-time smoothing on the echo signal, effectively suppressing noise fluctuations, thereby smoothing the signal, reducing measurement fluctuations and errors, and improving measurement accuracy.

[0087] Finally, the sliding window algorithm is used to detect the echo peak, and the valid peak is screened out through threshold judgment. The sliding window is used to slide gradually on the signal. By comparing the data in the window, the local peak of the signal is identified, and the effective reflected echo signal of the ultrasound is captured. For all detected peaks, the threshold judgment can be used to filter out those lower peaks caused by noise or interference, and only significant peaks are retained. By screening and removing false peaks, it is ensured that the echo peak corresponds to the real reflection signal, further improving the reliability of detection.

[0088] After the above processing, the system can output a clear echo signal, showing the effective propagation time and path of the ultrasonic wave, which can be used for subsequent thickness and compaction calculations. Signal processing can effectively remove noise and interference, retain the effective ultrasonic echo signal, and make the measurement more accurate and reliable.

[0089] S3, temperature compensation, use the compensation formula to calculate the actual propagation speed of the ultrasonic wave according to the current temperature. The formula is:

[0090] V(T)=V0·(1+α·(T-T0));

[0091] Where: V(T) is the actual propagation speed of ultrasound;

[0092] T is the current temperature of the asphalt surface;

[0093] V0 is the speed of sound at the reference temperature T0;

[0094] α is the temperature compensation coefficient, which is determined by experimental data;

[0095] S4. Thickness and density calculation: The thickness d of the asphalt layer is calculated based on the time difference t between ultrasonic emission and reception and the sound velocity V(T) after temperature compensation. The formula is:

[0096] d = V(T)·t;

[0097] Based on the density formula:

[0098] ρ=E / (K 2 ·V(T) 2 );

[0099] The density ρ of asphalt is calculated using the elastic modulus E and the speed of sound V(T) of the material;

[0100] Through density ρ and maximum dry density ρ c The ratio of the compaction degree K = ρ / ρ c ;

[0101] S5. Calibration process: regularly calibrate the signal according to the standard sample with known thickness and density to ensure the peak detection accuracy of the echo signal. Measure the sound velocity of the standard material under different temperature conditions, fit the temperature compensation coefficient α and the reference sound velocity V0, and use the material elastic modulus E and maximum dry density ρ obtained in the laboratory. c , update the density calculation reference value.

[0102] The K value is set as a national unified constant as follows:

[0103]

[0104] After adding temperature compensation to this method, the detection system can adjust the propagation speed of ultrasound in real time according to the change of ambient temperature, thereby eliminating the influence of temperature on thickness and compaction measurement. This compensation ensures the accuracy of data under high temperature conditions, such as when asphalt is just laid, improves the measurement accuracy and long-term stability of the equipment, enables the system to obtain consistent and reliable detection results under extreme temperature conditions, and improves the automation and intelligence level of the equipment.

[0105] Example 2

[0106] Further illustrate with reference to Example 1, Figure 4-8 As shown in the structure, since the inspection of asphalt pavement is often carried out on a newly paved road surface inside the asphalt, so as to find unqualified areas and repair them before it is completely solidified, the temperature of the asphalt pavement is relatively high, so that the device faces the problem of heat dissipation of isolating the external high temperature environment and the operation of internal equipment. In this embodiment, the shell 1 adopts a double-layer structure design, including a bottom shell 10, and an inner shell 12 and an outer shell 11 arranged on the top of the bottom shell 10, wherein the bottom shell 10 supports the entire device, the bottoms of the inner shell 12 and the outer shell 11 are both open, the outer shell 11 is mounted on the outside of the inner shell 12, and an insulating cavity is arranged between the two, which effectively isolates the influence of external high temperature on internal precision components, the lifting detection mechanism 3, the battery 4, the partition 5 and the data processor 6 are all arranged in the inner shell 12, and the control and display panel 7 is arranged on the top of the outer shell 11.

[0107] Such a design can achieve the effect of isolating the external high temperature through the heat insulation cavity between the outer shell 11 and the inner shell 12.

[0108] Furthermore, an aerogel felt 110 is provided on the inner side of the outer shell 11 to isolate the external high temperature and reduce heat conduction. The aerogel felt itself has extremely low thermal conductivity and can effectively block the transfer of heat to the inner shell 12, further improving the thermal insulation performance of the equipment.

[0109] The inner shell 12 is composed of five panels 120. The panels 120 and the partitions 5 are provided with cavities 121 inside to provide additional heat insulation protection. A plurality of isolation plates 122 are provided inside the cavity 121 to isolate the cavity 121 into a plurality of chambers. Such a design not only enhances the stability of the structure, but also helps to distribute the heat layer by layer to avoid concentration in a certain area. At the same time, each chamber is encapsulated with a phase change material 123. Utilizing the characteristics of the phase change material 123, when the external temperature rises, the phase change material absorbs excess heat and undergoes a phase change, such as from a solid state to a liquid state, thereby maintaining the temperature inside the shell stable. When the temperature drops, the phase change material releases the stored heat and acts as a heat buffer. This design ensures the internal temperature stability of the device in a high temperature environment, thereby utilizing the aerogel felt to isolate the external temperature while utilizing the phase change material to cool the interior.

[0110] It should be noted that the phase change material 123 can be one of sodium nitrate, calcium chloride, paraffin, fatty acid and a composite phase change material. In the present embodiment, a composite phase change material of paraffin and thermal conductive filler is preferred.

[0111] In a preferred embodiment, the bottom shell 10 is composed of a lower plate 100 and an upper plate 101, wherein the lower plate 100 includes a lower plate body 1000, a lower opening 1001 is provided at the center of the lower plate body 1000, a support frame 1002 extending upward is provided at the edge of the lower opening 1001, a lower docking frame 1003 extending upward is provided at the edge of the lower plate body 1000, and an aerogel felt 110 is also provided on the top of the lower plate body 1000;

[0112] The upper plate 101 includes an upper plate body 1010, an upper opening 1011 matching with the lower opening 1001 is arranged at the center of the upper plate body 1010, an upper docking frame 1012 extending downward and corresponding to the lower docking frame 1003 is arranged at the edge of the upper plate body 1010, and the contact surface of the upper docking frame 1012 and the lower docking frame 1003 is a matching wedge shape, and the two are fixed by screws;

[0113] When the lower plate 100 and the upper plate 101 are connected, a heat-insulating cavity is formed therebetween, thereby forming an effective heat-insulating structure at the bottom, and the lower opening 1001 and the upper opening 1011 form a detection port 2 .

[0114] In the preferred embodiment, the upper plate 101 also includes an outer shell docking frame 1013 and an inner shell docking frame 1014 arranged on the top, and the outer shell docking frame 1013 and the inner shell docking frame 1014 correspond to the bottom ends of the outer shell 11 and the inner shell 12 respectively, and the contact surfaces are matching wedge shapes and are fixed by screws.

[0115] Through the above structure, the housing 1 is designed to be a detachable structure, which is convenient for overall maintenance and replacement, and the wedge-shaped docking structure is used to achieve rapid positioning and docking during installation.

[0116] It should be noted that, in this embodiment, when the detection portion 303 is retracted to the top, its bottom portion overlaps with the top portion of the detection port 2 , thereby effectively preventing the heat of the asphalt from entering the housing 1 through the detection port 2 .

[0117] Example 3

[0118] Further illustrate with reference to Examples 1 and 2, Figure 9-12 In order to further improve the heat dissipation effect of the internal mechanism, in the present embodiment, a spirally arranged water-cooling pipe 13 is further provided in the insulation cavity between the outer shell 11 and the inner shell 12 to assist heat conduction and heat dissipation. The spiral arrangement can effectively increase the heat dissipation area, so that the heat can be more efficiently transferred to the coolant.

[0119] A water cooling circulation assembly 14 is arranged on the top of the outer shell 11, which includes a circulation pump 142, a water tank 140 and a radiator 141. The water inlet of the water cooling pipe 13 is connected to the output end of the circulation pump 142, the water outlet is connected to the input end of the radiator 141, the output end of the radiator 141 is connected to the inlet of the water tank 140, and the outlet of the water tank 140 is connected to the input end of the circulation pump 142 through a pipe 143.

[0120] With such a design, a closed circulation system can be formed by the water-cooling pipe 13 and the water-cooling circulation component 14. The spirally arranged water-cooling pipe 13 absorbs the heat between the inner and outer shells, and the water-cooling circulation component 14 is used to dissipate the heat to the environment, providing an efficient thermal management system. The setting of the water cooling system further reduces the temperature inside the equipment shell, extends the service life of the equipment, and improves the accuracy and stability of the detection. At the same time, setting the water-cooling circulation component 14 on the top of the outer shell 11 can keep it away from asphalt.

[0121] In this embodiment, the coolant is preferably an aqueous solution of ethylene glycol or propylene glycol.

[0122] Furthermore, a plurality of heat transfer frames 15 connected to the water cooling pipe 13 are arranged on the outside of the panel 120 on the side of the inner shell 12. The heat transfer frame 15 includes an inverted "L"-shaped support frame 150 arranged on the outside of the panel 120. The support frame 150 is fixed to the outside of the panel 120 by screws. An arc groove 151 adapted to the water cooling pipe 13 is arranged on the top of the support frame 150 so that it can fit with the water cooling pipe 13. A plurality of inclined supports 152 are arranged at the inner corners of the support frame 150 to improve the support and increase the heat transfer efficiency. Such a design can further enhance the internal heat dissipation effect.

[0123] In the preferred embodiment, temperature sensors are provided in the insulation cavity between the outer shell 11 and the inner shell 12, as well as in the inner shell 12, so that the temperature sensors can be used to detect the temperature in the insulation cavity and the inner shell 12 in real time, and then the heat dissipation measures can be adjusted in a targeted manner.

[0124] Example 4

[0125] Further illustrate with reference to Example 1, Figure 13-21 In order to avoid unnecessary displacement of the device during detection, in this embodiment, the pulley 8 includes an extension block 80 arranged at the bottom corner of the housing 1, a pulley body 81 is arranged at the bottom of the extension block 80, and a locking component 82 is arranged on the top of the extension block 80 to penetrate and lock the pulley body 81.

[0126] The universal pulley body 81 includes a fixed plate 810, a pulley frame 811 and a pulley 812. The pulley 812 is rotatably arranged in the pulley frame 811. A rotating shaft 813 is arranged on the top of the pulley frame 811. The top of the rotating shaft 813 passes through the bearing at the center of the fixed plate 810 and is connected to a limiting plate 814, so that the pulley frame 811 and the pulley 812 are rotatably arranged on the fixed plate 810 to achieve a universal rotation effect. The limiting plate 814 has the effect of preventing falling off.

[0127] A locking hole 816 is provided at the top of the rotating shaft 813, and a continuous arc-shaped groove 815 is provided on the side wall of the locking hole 816, and the top of the arc-shaped groove 815 is trumpet-shaped. The locking hole 816 and the arc-shaped groove 815 are used to cooperate with the locking component 82 to achieve the effect of locking the angle.

[0128] A telescopic hole 801 is provided at the center of the extension block 80 , and a telescopic slot 802 with an open lower end is provided on the side wall of the telescopic hole 801 . The telescopic slot 802 has the same size as the arc-shaped slot 815 .

[0129] The locking component 82 includes a fixing part 820 arranged on the top of the extension block 80, the end of the fixing part 820 is connected to the bottom corner of the shell 1, and a center hole 821 identical to the telescopic hole 801 is arranged on the fixing part 820. The center hole 821 is coaxial with the telescopic hole 801, and a sleeve 822 with an inner diameter larger than its diameter is arranged at the top of the center hole 821. A retaining ring 823 with an inner diameter smaller than the inner diameter of the sleeve 822 is arranged at the top, and a notch 824 is arranged on the inner side of the retaining ring 823.

[0130] A locking member is retractably inserted in the telescopic hole 801, the center hole 821, the sleeve 822 and the retaining ring 823, and the locking member includes a telescopic rod 825 inserted in the telescopic hole 801, the center hole 821, the sleeve 822 and the retaining ring 823. A boss 826 that is compatible with the telescopic groove 802 and the arc-shaped groove 815 is arranged on the outer side of the bottom end of the telescopic rod 825. The boss 826 is movably arranged in the telescopic groove 802. When the telescopic rod 825 is pressed down and inserted into the locking hole 816, the lower end of the boss 826 can be inserted into one of the arc-shaped grooves 815 in the locking hole 816, so that the boss 826 is located in the telescopic groove 802 and the arc-shaped groove 815 at the same time, which has the effect of locking the angle of the pulley body 81. The trumpet shape at the top of the arc-shaped groove 815 is convenient for the insertion of the boss 826, and the bottom end of the boss 826 is hemispherical.

[0131] A connecting port 827 is provided at the top of the telescopic rod 825, and a rotating groove 828 passing through the connecting port 827 is provided on the side wall thereof. A connecting shaft 830 is rotatably inserted in the connecting port 827, and a rotating locking block 831 passing through the rotating groove 828 is provided on the outer side of the connecting shaft 830. The length of the rotating groove 828 is at least twice that of the rotating locking block 831, and the rotating locking block 831 is adapted to the size of the notch 824. A T-shaped shaft 829 is connected to the top of the connecting shaft 830, and a return spring 832 is provided between the T-shaped shaft 829 and the fixing member 820 and is sleeved on the outside of the connecting shaft 829 and the telescopic rod 825.

[0132] With such a design, the T-axis 829 and the connecting shaft 830 can be simultaneously rotated in the connecting port 827, thereby causing the rotating lock block 831 to rotate in the rotating groove 828, and the rotating groove 828 also limits the rotation angle of the T-axis 829. Therefore, when the rotating lock block 831 rotates to one end of the rotating groove 828, it is aligned with the notch 824, so that it can be pushed through the notch 824 by pressing down, and then the lower end of the protrusion 826 is inserted into the arc-shaped groove 815, and then the rotating lock block 831 is rotated to the other end of the rotating groove 828. The friction between the rotating lock block 831 and the bottom of the retaining ring 823 can be utilized to achieve a locking effect. When it needs to be released, the rotating lock block 831 is rotated to align with the notch 824. Under the action of the reset spring 832, a rapid rebound and reset effect can be achieved, thereby releasing the lock.

[0133] It should be noted that when the telescopic rod 825 is fully inserted into the locking hole 816, the top of the boss 826 is located in the telescopic groove 802, and the rotating locking block 831 is located below the retaining ring 823. In addition, in this embodiment, the overall locking sliding effect is achieved by locking the four pulleys 8 at different angles.

[0134] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An asphalt pavement detection device, characterized in that: include: A housing (1), wherein pulleys (8) are arranged at the four corners of the bottom end of the housing (1), and a detection port (2) is arranged at the center of the bottom end; Two partitions (5) are arranged in sequence in the shell (1) to separate the interior of the shell (1) into three chambers; The lifting detection mechanism (3) is built into the lowest chamber inside the housing (1), and the detection part (303) thereon can pass through the detection port (2) to detect the asphalt road surface below; A battery (4) is built into the housing (1) and placed on one of the partitions (5); A data processor (6) is built into the housing (1) and placed on another partition (5); A control and display panel (7) is arranged on the top of the housing (1); The detection unit (303), the battery (4), the data processor (6) and the control and display panel (7) are electrically connected.

2. The asphalt pavement detection device according to claim 1, characterized in that: The lifting detection mechanism (3) comprises two symmetrically arranged vertical rods (301) and a telescopic electric cylinder (302); the two ends of the vertical rods (301) are respectively connected to the bottom of the partition (5) located below and the inner bottom wall of the shell (1); the fixed end of the telescopic electric cylinder (302) is connected to the bottom of the partition (5) located below, and the telescopic end is connected to the detection part (303); the top of the detection part (303) is provided with two sliding parts (304) respectively connected to the two vertical rods (301) in a slidable manner; The detection part (303) comprises a detection box (3030) with an opening at the bottom. A supporting plate (3031) is arranged in the detection box (3030). An ultrasonic sensor (3032) and a temperature sensor (3033) with a detection end facing downward are arranged through the supporting plate (3031).

3. The asphalt pavement detection device according to claim 2, characterized in that: Detection methods include: S1, data collection, transmitting ultrasonic signals to the asphalt pavement through the ultrasonic sensor (3032), and receiving the reflected signals, and at the same time using the temperature sensor (3033) to measure the current temperature of the asphalt pavement for temperature compensation; S2, signal processing, bandpass filtering is performed on the received ultrasonic signal to filter out irrelevant frequencies and retain the target frequency band signal, and then the spectrum is analyzed using fast Fourier transform to separate the effective signal, and the wavelet denoising algorithm and Kalman filter algorithm are used to remove environmental noise and smooth the signal, and then the sliding window algorithm is used to detect the echo peak, and the effective peak is screened out through threshold judgment; S3, temperature compensation, use the compensation formula to calculate the actual propagation speed of the ultrasonic wave according to the current temperature. The formula is: V(T)=V0·(1+α·(T-T0)); Where: V(T) is the actual propagation speed of ultrasound; T is the current temperature of the asphalt surface; V0 is the speed of sound at the reference temperature T0; α is the temperature compensation coefficient, which is determined by experimental data; S4. Thickness and density calculation: The thickness d of the asphalt layer is calculated based on the time difference t between ultrasonic emission and reception and the sound velocity V(T) after temperature compensation. The formula is: d = V(T)·t; Based on the density formula: ρ=E / (K 2 ·V(T) 2 ); The density ρ of asphalt is calculated using the elastic modulus E and the speed of sound V(T) of the material; Through density ρ and maximum dry density ρ c The ratio of the compaction degree K = ρ / ρ c ; S5. Calibration process: regularly calibrate the signal according to the standard sample with known thickness and density to ensure the peak detection accuracy of the echo signal. Measure the sound velocity of the standard material under different temperature conditions, fit the temperature compensation coefficient α and the reference sound velocity V0, and use the material elastic modulus E and maximum dry density ρ obtained in the laboratory. c , update the density calculation reference value.

4. An asphalt pavement detection device according to any one of claims 1 to 3, characterized in that: The housing (1) comprises a bottom housing (10), and an inner housing (12) and an outer housing (11) arranged on the top of the bottom housing (10); the bottoms of the inner housing (12) and the outer housing (11) are both open; the outer housing (11) is sleeved on the outside of the inner housing (12), and a heat-insulating cavity is arranged between the two; a lifting detection mechanism (3), a battery (4), a partition (5) and a data processor (6) are all arranged in the inner housing (12); and a control and display panel (7) is arranged on the top of the outer housing (11).

5. The asphalt pavement detection device according to claim 4, characterized in that: An aerogel felt (110) is arranged on the inner side of the outer shell (11), and the inner shell (12) is composed of five panels (120). The panels (120) and the partition (5) are provided with cavities (121) inside, and a plurality of isolation plates (122) are arranged in the cavity (121) to isolate the cavity (121) into a plurality of chambers, and a phase change material (123) is encapsulated in each chamber.

6. The asphalt pavement detection device according to claim 5, characterized in that: Bottom shell( 10) is composed of a lower plate (100) and an upper plate (101), wherein the lower plate (100) includes a lower plate body (1000), a lower opening (1001) is arranged at the center of the lower plate body (1000), an upwardly extending support frame (1002) is arranged at the edge of the lower opening (1001), an upwardly extending lower docking frame (1003) is arranged at the edge of the lower plate body (1000), and an aerogel felt (110) is also arranged on the top of the lower plate body (1000); The upper plate (101) comprises an upper plate body (1010), wherein an upper opening (1011) matching with the lower opening (1001) is arranged at the center of the upper plate body (1010), and an upper docking frame (1012) extending downward and corresponding to the lower docking frame (1003) is arranged at the edge of the upper plate body (1010), and the contact surfaces of the upper docking frame (1012) and the lower docking frame (1003) are matching wedge-shaped, and the two are fixed by screws; When the lower plate (100) and the upper plate (101) are connected, a heat-insulating cavity is formed between the two, and the lower opening (1001) and the upper opening (1011) form a detection port (2).

7. The asphalt pavement detection device according to claim 6, characterized in that: The upper plate (101) also includes an outer shell docking frame (1013) and an inner shell docking frame (1014) arranged on the top, the outer shell docking frame (1013) and the inner shell docking frame (1014) respectively correspond to the bottom ends of the outer shell (11) and the inner shell (12), and the contact surfaces are adapted wedge-shaped and fixed by screws.

8. The asphalt pavement detection device according to claim 7, characterized in that: A spirally arranged water cooling pipe (13) is also provided in the heat-insulating cavity between the outer shell (11) and the inner shell (12); a water cooling circulation assembly (14) is provided on the top of the outer shell (11), which comprises a circulation pump (142), a water tank (140) and a radiator (141); a water inlet of the water cooling pipe (13) is connected to an output end of the circulation pump (142); a water outlet is connected to an input end of the radiator (141); an output end of the radiator (141) is connected to an inlet of the water tank (140); and an outlet of the water tank (140) is connected to an input end of the circulation pump (142) via a pipe (143).

9. The asphalt pavement detection device according to claim 8, characterized in that: A plurality of heat transfer frames (15) connected to the water cooling pipe (13) are arranged on the outside of the panel (120) on the side of the inner shell (12), and the heat transfer frames (15) include an inverted "L"-shaped support frame (150) arranged on the outside of the panel (120), an arc groove (151) adapted to the water cooling pipe (13) is arranged on the top of the support frame (150), and a plurality of inclined supports (152) are arranged at the inner corners of the support frame (150); Temperature sensors are provided in the heat-insulating cavity between the outer shell (11) and the inner shell (12), and in the inner shell (12).

10. The asphalt pavement detection device according to claim 1, characterized in that: The pulley (8) comprises an extension block (80) arranged at a corner of the bottom end of the housing (1), a pulley body (81) is arranged at the bottom of the extension block (80), and a locking component (82) is arranged at the top of the extension block (80) which can penetrate and lock the pulley body (81); The pulley body (81) comprises a fixed plate (810), a pulley frame (811) and a pulley (812), wherein the pulley (812) is rotatably arranged in the pulley frame (811), a rotating shaft (813) is arranged at the top of the pulley frame (811), the top end of the rotating shaft (813) passes through a bearing at the center of the fixed plate (810) and is connected to a limiting plate (814), a locking hole (816) is arranged at the top end of the rotating shaft (813), a continuous arc-shaped slot (815) is arranged on the side wall of the locking hole (816), and the top end of the arc-shaped slot (815) is horn-shaped; A telescopic hole (801) is provided at the center of the extension block (80), and a telescopic groove (802) with an open lower end is provided on the side wall of the telescopic hole (801), and the telescopic groove (802) has the same size as the arc-shaped slot (815); The locking component (82) comprises a fixing member (820) arranged at the top of the extension block (80); the fixing member (820) is provided with a center hole (821) identical to the telescopic hole (801); the top of the center hole (821) is provided with a sleeve (822) having an inner diameter larger than the diameter thereof; the top of the sleeve (822) is provided with a snap ring (823) having an inner diameter smaller than the diameter thereof; the inner side of the snap ring (823) is provided with a notch (824); the telescopic hole (801), the center hole (821), the sleeve (822) and the snap ring (823) are telescopically plugged with the locking member; the locking member comprises a telescopic rod (825) plugged into the telescopic hole (801), the center hole (821), the sleeve (822) and the snap ring (823); the outer side of the bottom end of the telescopic rod (825) is provided with a slot that is compatible with the telescopic groove (802) and the arc-shaped slot (815) are matched with a convex column (826), the convex column (826) is movably arranged in the telescopic slot (802), the top of the telescopic rod (825) is provided with a connecting port (827), the side wall of the connecting port (827) is provided with a rotating slot (828) penetrating the connecting port, a connecting shaft (830) is rotatably inserted in the connecting port (827), the outer side of the connecting shaft (830) is provided with a rotating lock block (831) penetrating the rotating slot (828), the length of the rotating slot (828) is at least twice that of the rotating lock block (831), the top of the connecting shaft (830) is connected with a T-shaped shaft (829), and a return spring (832) is provided between the T-shaped shaft (829) and the fixing member (820) and is sleeved on the outside of the connecting shaft and the telescopic rod (825); When the telescopic rod (825) is completely inserted into the locking hole (816), the top end of the protruding column (826) is located in the telescopic groove (802), and the rotating locking block (831) is located below the snap ring (823).

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