Asphalt mixture stability detection equipment and detection method thereof

Abstract

The invention belongs to the technical field of asphalt mixtures, and particularly relates to asphalt mixture stability detection equipment and a detection method thereof. Comprising a sealable test chamber used for placing an asphalt sample to be tested; a storage chamber for receiving water from the test chamber; the heating element is arranged in the test chamber and is used for keeping the temperature of water in the test chamber and the storage chamber constant; the pressurized air source is connected with the test chamber through an air hose and is used for providing pressurized air into the test chamber and simulating initial pressure when the tire is in contact with the asphalt surface and subsequent pore pressure generated due to the fact that water enters pores; the density detection unit is used for detecting the density change of the asphalt sample, comparing the density change with the density before detection, and evaluating the stability of the asphalt mixture according to the density change. The invention provides the detection equipment and the detection method which can simulate the stress process of a tire during rolling on a wet asphalt pavement, are simple and convenient to operate and efficient in detection and can accurately evaluate the stability of the asphalt mixture.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of asphalt mixture, and particularly relates to an asphalt mixture stability detection device and a detection method thereof. BACKGROUND

[0002] As a key material for road construction, the stability of asphalt mixture is crucial to the service life of the road and driving safety. The tire load generated by vehicle traffic can cause complex stress on the asphalt mixture paved on the road. When the tire rolls on the wet asphalt surface, the asphalt material will experience three typical stress stages: first, the initial pressure stage of the initial contact of the tire with the surface, in which the tire generates instantaneous pressure on the asphalt surface; then, a large amount of water is forced into the asphalt pores under the pressure, generating a large pore pressure; then, the tire and the road surface remain in contact, and the water begins to disperse under the tire; finally, the reverse pressure stage of the tire surface leaving the road surface. Under these stresses, especially in a wet environment, the internal structure of the asphalt mixture will change. In the road surface prone to moisture, the pore pressure will weaken the bonding force between the rocks, causing the aggregate particles to loosen, and then showing a decrease in the sample volume specific gravity (density), ultimately leading to rock scattering, road potholes, and other water damage problems.

[0003] At present, the existing asphalt mixture stability detection methods have many shortcomings. Some detection methods are difficult to accurately simulate the complete stress process of the tire rolling on the wet asphalt road surface, which leads to the inability to truly reflect the stability of the asphalt mixture in the actual use environment. Some detection devices are complex to operate and have a long detection period, which is difficult to meet the demand for rapid detection of the quality of asphalt mixture in the rapid development process of road construction. In addition, some detection methods cannot effectively quantify the performance changes of the asphalt mixture after experiencing different stress stages, which is not conducive to accurately evaluating the quality of asphalt design. SUMMARY

[0004] The purpose of the present application is to provide a detection device and a detection method thereof that can simulate the stress process of the tire rolling on the wet asphalt road surface, are simple to operate, efficient in detection, and can accurately evaluate the stability of the asphalt mixture.

[0005] Therefore, the present application provides an asphalt mixture stability detection device and a detection method thereof, which comprises:

[0006] A sealable test chamber for placing the asphalt sample to be tested;

[0007] A fixing frame arranged in the test chamber for supporting the asphalt sample;

[0008] A storage chamber for receiving water from the test chamber;

[0009] a drain pipe arranged between the test chamber and the storage chamber;

[0010] a flow limiting valve arranged on the drain pipe for controlling the flow of water from the test chamber to the storage chamber;

[0011] an inflow pipe arranged between the test chamber and the storage chamber;

[0012] a check valve arranged on the inflow pipe for allowing water to flow from the storage chamber into the test chamber;

[0013] a heating element arranged in the test chamber for maintaining the temperature of water in the test chamber and the storage chamber constant;

[0014] a temperature sensor for detecting the temperature in the test chamber and controlling the temperature change of the heating element to accelerate the performance change process of the asphalt mixture under simulated stress conditions and shorten the detection time;

[0015] a water level sensor arranged in the test chamber for detecting the water level in the test chamber;

[0016] a pressurized air source connected to the test chamber through an air hose for providing pressurized air to the test chamber to simulate the initial pressure when the tire contacts the asphalt surface and the subsequent pore pressure generated by water entering the pores;

[0017] a pressure sensor arranged in the test chamber and electrically connected to the pressurized air source for real-time monitoring of the pressure value in the test chamber;

[0018] a density detection unit for detecting the density change of the asphalt sample and comparing it with the density before detection to evaluate the stability of the asphalt mixture according to the density change.

[0019] In the above technical solution, further, the test chamber has at least two or more.

[0020] In any of the above technical solutions, further, a filter screen is arranged inside the drain pipe and the inflow pipe to prevent sample debris from entering the pipes.

[0021] In any of the above technical solutions, further, a controller unit is included, which is electrically connected to the temperature sensor, the water level sensor, the pressure sensor, and the flow limiting valve for controlling the pressure application, temperature control, water level adjustment, and water addition operation of each test chamber; the controller unit is connected to the pressurized air source for controlling the application of a specified level of air pressure to each test chamber to ensure that the pressure can be accurately applied according to the set pressure curve to simulate the pressure change at different stages of the tire rolling process.

[0022] In any of the above technical solutions, further, a pressure relief valve is arranged on the test chamber for pressure relief when the pressure in the test chamber is abnormal.

[0023] In any of the above technical solutions, further comprising a positioning mechanism, the positioning mechanism comprising:

[0024] A support assembly, the support assembly comprising a base and a vertical plate arranged vertically on the base;

[0025] An elastic support component arranged on the support assembly for providing elastic buffering or support force;

[0026] A connecting rod mechanism connected between the support assembly and the asphalt sample to be tested for transmitting motion and force;

[0027] An operating component cooperating with the connecting rod mechanism for controlling or driving the motion of the connecting rod mechanism, the operating component comprising at least one movable operating lever for driving the action of the connecting rod mechanism through the motion of the operating lever.

[0028] In any of the above technical solutions, further, the elastic support component is a coil spring, one end of the coil spring is fixed to the vertical plate, and the other end is connected to a corresponding connection point of the connecting rod mechanism.

[0029] In any of the above technical solutions, further, the connecting rod mechanism comprises a plurality of connecting rods hingedly connected to each other, and can realize motion in a specific direction; the connecting rods are provided with clamping jaws in contact with the asphalt sample to be tested.

[0030] In any of the above technical solutions, further, the operating component further comprises a limiting structure for limiting the motion stroke of the operating lever to prevent excessive motion of the operating lever.

[0031] In any of the above technical solutions, further, a detection method for an asphalt mixture stability detection device, comprising the following steps:

[0032] S1: placing a plurality of same-sized asphalt samples to be tested on the fixing frame of each test chamber;

[0033] S2: fixing the sample on the fixing frame of the test chamber by the positioning mechanism, then adding water to the test chamber and the storage chamber to a predetermined water level, closing the flow limiting valve in the drain pipe, adding additional water to the test chamber to completely cover the sample, and then sealing the test chamber;

[0034] S3: setting the detection parameters such as pressure change and temperature by the controller unit, starting the pressurized air source and the heating element, the pressurized air source simulating the tire rolling stress according to a preset pressure curve, applying pressurized air of a predetermined pressure to the test chamber through the air hose to pressurize the test chamber and force the water into the sample; maintaining the test chamber at a set temperature by controlling the heating element to accelerate the performance change of the sample, establishing a predetermined regulated pressure in the test chamber and maintaining the predetermined period of time;

[0035] S4: opening the flow limiting valve in the drain pipe, the pressurized air in the test chamber forces water to flow from the test chamber into the storage chamber through the drain pipe until the water level in the test chamber drops to a predetermined level;

[0036] S5: releasing the pressurized air in the test chamber to restore the test chamber to atmospheric pressure, the water in the storage chamber returns to the test chamber through the inflow pipe;

[0037] S6: repeating the above alternating pressurization and depressurization steps to accelerate the process so that the sample is subjected to the effects of the tire on the asphalt pavement to evaluate the quality of the asphalt; after the detection is completed, the density detection unit measures the sample density, compares it with the density before detection, and evaluates the stability of the asphalt mixture according to the change in density.

[0038] The beneficial effects of the present application are:

[0039] 1. By simulating the initial pressure of the tire contacting the asphalt surface, the pore pressure generated by the water entering the pores, and the back pressure stage when the tire leaves, combined with temperature control to accelerate the change of asphalt mixture performance, the density change of the asphalt sample after experiencing simulated stress is detected quickly and accurately, thereby effectively evaluating the stability of the asphalt mixture, providing reliable basis for asphalt design and quality control of road construction, ensuring that the asphalt mixture used in road construction has good performance, reducing the problem of road damage such as potholes and cracking caused by insufficient stability of asphalt mixture, prolonging the service life of the road, and ensuring driving safety;

[0040] 2. The provision of two or more test chambers enables simultaneous detection of multiple asphalt samples, significantly shortening the detection time of batch samples, meeting the demand for rapid quality detection of a large number of asphalt mixtures in road construction projects, and providing more comprehensive and accurate data support for the optimization design and quality control of asphalt mixtures, thereby helping engineers to select asphalt mixture formulations with better performance;

[0041] 3. The filter screen provided inside the drain pipe and the inflow pipe ensures the normal operation of the asphalt mixture stability detection equipment and the accuracy of the detection results, prevents debris falling off the surface or inside of the asphalt sample from entering the pipeline during the detection process, avoids the blockage of the pipeline by the debris, affects the normal flow of water between the test chamber and the storage chamber, ensures the smooth progress of the pressure simulation process and the water circulation process, and thus maintains the stable operation of the equipment;

[0042] 4、Through the synergistic effect of the elastic supporting component, the connecting rod mechanism and the operating component, stable and adjustable positioning and fixing of the asphalt sample are realized, displacement or shaking of the sample in the detection process due to factors such as pressure action and water flow impact is avoided, and the accuracy of the detection result is improved; meanwhile, the position and fixed state of the sample can be quickly adjusted according to different specifications, shapes of the asphalt sample and different detection requirements, the adaptability of the equipment to diversified samples is enhanced, the detection efficiency is improved, and more perfect operation guarantee is provided for the asphalt mixture stability detection. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0044] Figure 2 is a system framework diagram of the present application;

[0045] Figure 3 is a first schematic diagram of the three-dimensional structure of the positioning mechanism of the present application;

[0046] Figure 4 is a second schematic diagram of the three-dimensional structure of the positioning mechanism of the present application;

[0047] Figure 5 is a partial schematic diagram of the three-dimensional structure of the positioning mechanism of the present application;

[0048] In the drawings, the reference signs are: 1, test chamber; 2, fixing frame; 3, storage chamber; 4, drain pipe; 41, flow limiting valve; 5, inflow pipe; 51, check valve; 6, heating element; 61, temperature sensor; 7, water level sensor; 8, pressurized air source; 81, pressure sensor; 82, air hose; 9, density detection unit; 10, filter screen; 11, controller unit; 12, pressure relief valve; 13, positioning mechanism; 131, support assembly; 1311, base; 1312, vertical plate; 132, elastic supporting component; 133, connecting rod mechanism; 1331, connecting rod; 1332, clamping jaw; 134, operating component; 1341, operating rod; 14, limiting structure. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0050] In the description of the present application, it should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description when appropriate. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0051] Embodiment 1:

[0052] As shown in Figure 1 and Figure 2 , the present embodiment provides an asphalt mixture stability detection device, comprising:

[0053] A sealable test chamber 1 for placing an asphalt sample to be tested;

[0054] A fixing frame 2 arranged in the test chamber 1 for supporting the asphalt sample;

[0055] A storage chamber 3 for receiving water from the test chamber 1;

[0056] A drain pipe 4 arranged between the test chamber 1 and the storage chamber 3;

[0057] A flow limiting valve 41 arranged on the drain pipe 4 for controlling the flow of water from the test chamber 1 to the storage chamber 3;

[0058] An inflow pipe 5 arranged between the test chamber 1 and the storage chamber 3;

[0059] A check valve 51 arranged on the inflow pipe 5 for allowing water to flow from the storage chamber 3 into the test chamber 1;

[0060] A heating element 6 arranged in the test chamber 1 for maintaining the water in the test chamber 1 and the storage chamber 3 at a constant temperature;

[0061] A temperature sensor 61 for detecting the temperature in the test chamber 1 and controlling the temperature change of the heating element 6 to accelerate the performance change process of the asphalt mixture under simulated stress conditions and shorten the detection time;

[0062] A water level sensor 7 arranged in the test chamber 1 for detecting the water level in the test chamber 1;

[0063] A pressurized air source 8 is connected to the test chamber 1 through an air hose 82 to provide pressurized air into the test chamber 1 to simulate the initial pressure when the tire contacts the asphalt surface and the subsequent pore pressure caused by water entering the pores;

[0064] A pressure sensor 81 is arranged in the test chamber 1 and electrically connected to the pressurized air source 8 to monitor the pressure value in the test chamber 1 in real time;

[0065] A density detection unit 9 is used to detect the density change of the asphalt sample, compare with the density before detection, and evaluate the stability of the asphalt mixture according to the density change.

[0066] In the technical solution, the asphalt mixture stability detection equipment aims to solve the existing problems of asphalt mixture stability detection, can accurately simulate the stress process of the tire on the wet asphalt pavement, through the initial pressure when the tire contacts the asphalt surface, the pore pressure caused by water entering the pores, and the back pressure stage when the tire leaves, combined with temperature control to accelerate the performance change of the asphalt mixture, quickly and accurately detect the density change of the asphalt sample after experiencing the simulated stress, thereby effectively evaluating the stability of the asphalt mixture, providing a reliable basis for asphalt design and road construction quality control, ensuring that the asphalt mixture used in road construction has good performance, reducing the road damage problems caused by insufficient stability of the asphalt mixture, such as potholes and cracking, prolonging the service life of the road, and ensuring driving safety.

[0067] Working principle: Place the asphalt sample to be tested on the fixed frame 2 in the test chamber 1, which can firmly support the sample to ensure its position stable during the detection process, avoiding the influence of the accuracy of the detection results due to the movement of the sample. Fill water into the test chamber 1 and the storage chamber 3, and monitor the water level in the test chamber 1 in real time through the water level sensor 7 to ensure that the water level reaches the appropriate height, preparing for the simulation of the conditions of the tire rolling on the wet road. The temperature sensor 61 detects the temperature in the test chamber 1 and feeds back the temperature data to the control system. According to the preset temperature parameters, the control system controls the operation of the heating element 6 to keep the water in the test chamber 1 and the storage chamber 3 at a constant temperature. By increasing the temperature, the performance change process of the asphalt mixture under simulated stress conditions can be accelerated, effectively shortening the detection time. The pressurized air source 8 provides pressurized air to the test chamber 1 through the air hose 82 to simulate the initial pressure when the tire contacts the asphalt surface and the subsequent pore pressure generated by the water entering the pores. The pressure sensor 81 monitors the pressure value in the test chamber 1 in real time and feeds back the data to the control system. According to the preset pressure curve, the control system accurately controls the operation of the pressurized air source 8 to ensure that the pressure can be applied to the asphalt sample according to the predetermined pressure change law. In this process, the pressurized air in the test chamber 1 forces the water to flow to the storage chamber 3 through the drain pipe 4, and the flow control valve 41 controls the flow rate of the water, so that the water flows out at an appropriate speed, simulating the process of water entering the asphalt pores under the action of tire pressure. When the preset pressurization time or pressure condition is reached, the control system controls the pressurized air source 8 to stop working and opens the corresponding valve to release the pressure in the test chamber 1, simulating the back pressure stage when the tire leaves the road surface. At this time, the pressure in the test chamber 1 decreases, and the water in the storage chamber 3 flows back to the test chamber 1 through the inflow pipe 5 (the check valve 51 ensures that water can only flow in one direction) under the action of the pressure difference, to make up for the amount of water discharged, at the same time, the water that has entered the pores of the asphalt sample will also flow out under the action of the pressure difference, to balance the pressure inside and outside the sample. The above-mentioned pressurization and depressurization process constitutes a test cycle, which is repeated by the control system to continuously simulate the stress of the tire on the wet asphalt road surface. During multiple cycles, the internal structure of the asphalt mixture will change under the combined action of pressure and temperature, and this change will be reflected in the density of the sample. The density detection unit 9 measures the initial density of the asphalt sample before the detection starts, and measures the density of the sample again after completing the predetermined test cycle. By comparing the density change of the sample before and after the detection, combined with the pre-set evaluation standard, the stability of the asphalt mixture is judged. If the sample density decreases significantly, it indicates that the internal structure of the asphalt mixture is severely damaged under the simulated stress, and the stability is poor; on the contrary, if the density change is small, it indicates that the stability of the asphalt mixture is good.During the whole detection process, the control system coordinates the work of each component to ensure that the detection process is automated and accurate, and to record and store key data such as temperature, pressure, and density in real time, facilitating subsequent analysis and processing of the detection results.

[0068] Embodiment 2

[0069] The embodiment provides an asphalt mixture stability detection device, in addition to the technical solutions of the above embodiments, further having the following technical features.

[0070] As Figure 1 shown in the embodiment, the optimized test chamber 1 has at least two or more.

[0071] In the technical solution, the asphalt mixture stability detection device with two or more test chambers 1 is mainly used to improve the detection efficiency and flexibility. On the one hand, it can simultaneously detect multiple asphalt samples, greatly shorten the detection time of batch samples, and meet the demand for rapid quality detection of a large number of asphalt mixtures in road construction projects. On the other hand, by setting different detection conditions (such as pressure, temperature, cycle number, etc.) in different test chambers 1, or testing asphalt samples with different components and proportions, it is convenient to conduct comparative tests and in-depth analysis of the influence of various factors on the stability of asphalt mixtures, to provide more comprehensive and accurate data support for the optimization design and quality control of asphalt mixtures, thereby helping engineers to select asphalt mixture formulations with better performance, and improving the quality and reliability of road construction.

[0072] Working principle: Put multiple asphalt samples to be tested on the fixing frame 2 in different test chambers 1. Each test chamber 1 can be independently sealed to ensure the stability and sealing of the pressure during the test. Water is injected into each test chamber 1 and the corresponding storage chamber 3, and the water level in each test chamber 1 is monitored in real time by the water level sensor 7 to ensure that the water level reaches the appropriate height. At the same time, the temperature sensor 61 and the heating element 6 provided in each test chamber 1 work together to independently adjust the temperature in the test chamber 1 according to the respective preset temperature parameters, so that the water remains at a constant temperature, providing a basic condition for simulating the stress action under different environments. The pressurized air source 8 of each test chamber 1 independently provides pressurized air to the test chamber 1 through the air hose 82. The pressure sensor 81 monitors the pressure value in each test chamber 1 in real time and feeds back the data to the control system. The control system can control the operation of each pressurized air source 8 according to the pre-set pressure curve of each test chamber 1, so that each test chamber 1 simulates the initial pressure when the tire contacts the asphalt surface under different degrees and the pore pressure generated by the water entering the pores. For example, test chamber 1A simulates the pressure condition of a high traffic flow section, and test chamber 1B simulates the pressure condition of a normal section. During the pressurization process, the pressurized air in each test chamber 1 forces the water to flow to the corresponding storage chamber 3 through the drain pipe 4, and the flow limiting valve 41 controls the water flow of each drain pipe 4. When the pre-set pressurization time or pressure condition is reached, the control system controls each test chamber 1 to release the pressure to simulate the back pressure stage when the tire leaves the road surface. At this time, the water in each storage chamber 3 flows back to the corresponding test chamber 1 through the inflow pipe 5 (the check valve 51 ensures one-way flow of water) under the action of pressure difference, to supplement the amount of water discharged, and at the same time, the water previously entering the pores of the asphalt sample flows out to balance the pressure. Then, the control system starts the pressurized air source 8 of each test chamber 1 again to start the next cycle of pressurization and pressure reduction, and so on. The density detection unit 9 provided in each test chamber 1 measures the initial density of the corresponding asphalt sample before the detection starts, and measures the density of the sample again after completing the predetermined test cycle. The control system collects and compares the detection data (including temperature, pressure change process, cycle number and density change, etc.) of different test chambers 1. By comparing the density change of the asphalt sample under different test conditions, researchers can clearly understand the influence of factors such as pressure and temperature on the stability of asphalt mixture; by comparing the detection results of asphalt samples with different components and proportions, the more stable asphalt mixture formula can be screened out to provide a scientific basis for decision-making for road construction.

[0073] As Figure 1 shown in the embodiment, the drain pipe 4 and the inflow pipe 5 are both provided with a filter screen 10 in the embodiment to prevent sample debris from entering the pipes.

[0074] In the technical solution, a filter screen 10 is arranged inside the drain pipe 4 and the inflow pipe 5, mainly to ensure the normal operation of the asphalt mixture stability detection equipment and the accuracy of the detection results. The debris falling off the surface or inside of the asphalt sample during the detection process is prevented from entering the pipeline, avoiding the debris from blocking the pipeline and affecting the normal flow of water between the test chamber 1 and the storage chamber 3, ensuring that the pressure simulation process and the water circulation process can be carried out smoothly, thereby maintaining the stable operation of the equipment.

[0075] As shown in the embodiment, the optimized also includes a controller unit 11, which is electrically connected with the temperature sensor 61, the water level sensor 7, the pressure sensor 81 and the flow limiting valve 41, respectively, for controlling the pressure application, temperature control, water level adjustment and water addition operation of the water source of each test chamber 1; the controller unit 11 is connected with the pressurized air source 8 for controlling the application of a specified level of air pressure to each test chamber 1, ensuring that the pressure can be accurately applied according to the set pressure curve, simulating the pressure change at different stages of the tire rolling process. Figure 2

[0076] In the technical solution, the controller unit 11 is arranged to realize the automation and precision control of the asphalt mixture stability detection equipment, ensuring that the detection process can highly simulate the real stress conditions of the tire rolling on the wet road surface, improving the reliability and accuracy of the detection results. Through the accurate control of the temperature, pressure, water level and other key parameters, the equipment can adapt to diversified detection needs, simplify the operation process and improve the detection efficiency, providing scientific and stable detection data support for the quality evaluation and optimized design of the asphalt mixture.

[0077] Working principle: The operator sets the pressure change curve of each test chamber 1 at different stages of the tire rolling process through the interactive interface of the controller unit 11, which includes parameters such as pressure size, change rate, duration, etc. The pressure sensor 81 monitors the pressure value in each test chamber 1 in real time and transmits the data to the controller unit 11 in real time. The controller unit 11 compares and analyzes the actual pressure value with the preset pressure curve. If the actual pressure value deviates from the preset curve, the controller unit 11 immediately sends a control instruction to the pressurized air source 8 to adjust the output pressure and flow of the pressurized air, ensuring that the pressure in the test chamber 1 accurately changes according to the set curve, realizing the accurate simulation of the pressure at different stages of the tire rolling (such as initial pressure, pore pressure, counter pressure).

[0078] ​The temperature parameters required by each test chamber 1 are set in the controller unit 11, including the target temperature and the temperature fluctuation range. The temperature sensor 61 continuously detects the temperature in the test chamber 1 and transmits the data to the controller unit 11. The controller unit 11 determines whether the current temperature is within the preset range according to the collected temperature data. When the temperature is lower than the lower limit of the preset range, the controller unit 11 sends an instruction to the heating element 6 to increase the heating power and quickly raise the temperature of the test chamber 1; when the temperature is higher than the upper limit of the preset range, the controller unit 11 reduces the power of the heating element 6 or stops heating to keep the temperature in a stable interval, providing a stable temperature environment for the performance change of asphalt mixture.

[0079] The water level sensor 7 detects the water level in each test chamber 1 in real time and feeds back the data to the controller unit 11. When the water level in the test chamber 1 is lower than the preset minimum water level, the controller unit 11 controls the water source to add water to the test chamber 1, accurately controls the flow and speed of water addition by adjusting the opening of the flow limiting valve 41, and the water level reaches the appropriate height; if the water level abnormally rises during the detection process, the controller unit 11 can control the drainage to ensure that the water level is always within the range required for normal detection.

[0080] The controller unit 11 is the "brain" of the device, which uniformly coordinates and manages the temperature sensor 61, the water level sensor 7, the pressure sensor 81, and the flow limiting valve 41, etc. During the entire detection process, according to the preset detection program and the data feedback of each sensor, the working state of each component is dynamically adjusted, so that the pressure application, temperature control, water level adjustment, etc. operate in coordination and cooperation, ensuring that the detection process is stable and efficient, and finally obtaining accurate and reliable detection results, providing a strong basis for the stability evaluation of asphalt mixture.

[0081] Embodiment 3:

[0082] The embodiment provides an asphalt mixture stability detection device, which has the following technical features in addition to the technical solutions of the above-mentioned embodiments.

[0083] As shown in Figure 1 and Figure 2 In this embodiment, the optimization also includes a pressure relief valve 12, which is arranged on the test chamber 1 and used for pressure relief when the pressure in the test chamber 1 is abnormal.

[0084] In the technical solution, a pressure relief valve 12 is arranged on the test chamber 1 of the asphalt mixture stability detection device, and the core purpose is to ensure the safety of device operation and the safety of operating personnel, and to ensure the stability of the detection process and the reliability of the detection results. Pressure abnormalities may occur during device operation due to various reasons, such as failure of the pressurized air source 8, failure of the control system, pipe blockage, etc. The pressure relief valve 12 can timely release the excessively high pressure, avoid damage to the test chamber 1 due to excessively high pressure, such as rupture and deformation, prevent the device from being damaged to affect normal detection work, and at the same time, prevent safety accidents caused by pressure abnormalities, thereby providing effective protection for stable operation of the device and safety of personnel. In addition, timely pressure relief can also avoid interference of pressure abnormalities on detection of asphalt samples, and ensure that the detection results truly reflect the stability of the asphalt mixture.

[0085] Working principle: During the detection process, the pressure in the test chamber 1 is monitored in real time by the pressure sensor 81, and the pressure data is transmitted to the controller unit 11. The controller unit 11 is pre-set with a normal pressure range value, and when the pressure value fed back by the pressure sensor 81 exceeds the upper limit of the normal range, it is determined that the pressure is abnormal. This pressure abnormality signal is transmitted to the pressure relief valve 12 and the controller unit 11 at the same time, triggering the pressure relief mechanism. When the pressure relief valve 12 receives the pressure abnormality signal, it is immediately started, and the opened pressure relief valve 12 provides a discharge channel for the high-pressure gas in the test chamber 1, so that the pressure in the test chamber 1 is rapidly released to the external environment, and the pressure value gradually decreases with the discharge of the gas. With continuous pressure release, the pressure sensor 81 continuously monitors the pressure change in the test chamber 1 and feeds back the real-time data to the controller unit 11. When the pressure decreases to the normal range, the controller unit 11 will send an instruction to close the pressure relief valve 12 to prevent external air from continuing to enter the test chamber 1, so that the pressure in the test chamber 1 remains stable. At this time, the device can continue to detect under the stable pressure environment, or the operating personnel can restart the detection program after confirming that the device has no other faults, so as to ensure that the detection process can proceed smoothly, and the detection results are not affected by the pressure abnormality.

[0086] Embodiment 4:

[0087] The embodiment provides an asphalt mixture stability detection device, which further has the following technical features in addition to the technical solutions of the above-mentioned embodiments.

[0088] As shown in Figure 3 In this embodiment, the optimization further includes a positioning mechanism 13, which includes:

[0089] The support assembly 131 includes a bottom base 1311 and a vertical plate 1312 arranged vertically on the base 1311;

[0090] The elastic supporting component 132 is arranged on the support assembly 131 and is used for providing elastic buffering or supporting force.

[0091] The connecting rod mechanism 133 is connected between the support assembly 131 and the asphalt sample to be tested and is used for transmitting motion and force.

[0092] The operating component 134 cooperates with the connecting rod mechanism 133 and is used for controlling or driving the connecting rod mechanism 133 to move. The operating component 134 includes at least one movable operating rod 1341. The movement of the operating rod 1341 drives the connecting rod mechanism 133 to move.

[0093] In the technical solution, the positioning mechanism 13 is arranged to improve the accuracy, reliability and flexibility of the sample fixing and testing operation of the asphalt mixture stability detection equipment. On the one hand, through the cooperation of the elastic supporting component 132, the connecting rod mechanism 133 and the operating component 134, the positioning and fixing of the asphalt sample are realized stably and adjustably. The sample is prevented from being displaced or shaken due to factors such as pressure action and water flow impact during the detection process. The uniform force on the sample during the detection process and the stable test condition are ensured. Therefore, the accuracy of the detection result is improved. On the other hand, the operating component 134 can flexibly control the connecting rod mechanism 133. The operator can quickly adjust the position and fixed state of the sample according to different specifications, shapes of the asphalt sample and different detection requirements. The adaptability of the equipment to diversified samples is enhanced. The detection efficiency is improved. More perfect operation guarantee is provided for the asphalt mixture stability detection.

[0094] Working principle: the bottom base 1311 is the foundation component of the positioning mechanism 13, which is stably installed on the platform inside or fixedly connected with the test chamber 1, providing stable support for the entire positioning mechanism 13. It usually has a large contact area and a certain weight to enhance stability and prevent displacement due to stress during detection. The vertical plate 1312 arranged vertically on the base 1311 is the main carrier for connecting other components. The vertical plate 1312 is used to install the elastic support component 132 and the connecting rod mechanism 133, allowing them to be arranged in order on the vertical plate 1312 and ensuring the accurate relative position relationship between the components, laying the foundation for subsequent sample positioning and force transmission. The elastic support component 132 is installed on the vertical plate 1312 of the bracket assembly 131 and is usually made of materials with elasticity such as springs and rubber buffers. During the detection process, when the test chamber 1 applies pressure to the asphalt sample, the sample will be subjected to a counterforce, and the elastic support component 132 can absorb and buffer this part of the counterforce to avoid damage or displacement of the sample due to excessive stress. The elastic properties of the elastic support component 132 can also be selected and adjusted according to the characteristics of different samples and detection requirements. For example, for fragile asphalt samples, a support component with a smaller elastic coefficient can be selected to provide a softer support force; for samples that need to withstand greater pressure, a support component with a larger elastic coefficient can be used to ensure that the sample remains stable during detection while effectively dispersing the pressure to ensure the smooth progress of the detection process. The connecting rod mechanism 133 is connected between the bracket assembly 131 and the asphalt sample to be tested, composed of multiple connecting rods, shafts and connecting pieces. During the detection process, the movement of the operating component 134 is transmitted to the sample through the connecting rod mechanism 133, achieving the adjustment of the sample position and fixed state. When the operator drives the operating rod 1341 to move through the operating component 134, the operating rod 1341 drives the connecting rod connected to it to rotate or move, and through a series of transmission between the connecting rods, the movement and force are accurately transmitted to the sample, so that the sample remains in the placed position, and the sample and the pressure applying device, water flow channel and other components of the test chamber 1 maintain appropriate relative positions, ensuring that the sample can be uniformly stressed and subjected to water flow during the detection process, thereby improving the accuracy of the detection results.

[0095] The operation lever 1341 in the operation component 134 has a movable characteristic, and an operator can control the movement of the operation lever 1341 through manual operation or by means of an electric, hydraulic or other driving device. The movement mode of the operation lever 1341 includes rotation, translation and the like, and different movement modes can realize different forms of driving of the connecting rod mechanism 133, thereby realizing diversified positioning and fixing operations of the sample. For example, the operator can rotate the operation lever 1341 to drive the connecting rod mechanism 133 to adjust the sample to rotate, so as to adapt to detection requirements at different angles; or the operator can translate the operation lever 1341 to push the connecting rod mechanism 133 to move the sample in the horizontal direction, thereby realizing accurate positioning of the sample in the test chamber 1. Through the cooperation of the operation component 134 and the connecting rod mechanism 133, the operator can flexibly and quickly adjust the position and fixing state of the sample according to specific detection requirements, so that the equipment can adapt to asphalt samples of different specifications and shapes, and the efficiency and accuracy of detection work are improved.

[0096] As shown in Figures 3-5 In this embodiment, the optimized elastic supporting component 132 is a spiral spring, one end of the spiral spring is fixed on the vertical plate 1312, and the other end is connected to the corresponding connection point of the connecting rod mechanism 133.

[0097] In this technical solution, the spiral spring is used as the elastic supporting component 132, and the core purpose is to provide stable and adjustable elastic buffering and support for the asphalt sample, thereby improving the stability of the sample position and the accuracy of the detection result in the detection process. In the process of simulating the stress of the tire on the asphalt pavement, the spiral spring can effectively absorb the impact force generated by the pressure fluctuation, so as to prevent the sample from being displaced or damaged due to uneven stress; at the same time, the elastic characteristic can adapt to the requirements of different specifications of samples and detection conditions, so as to ensure that the equipment can accurately simulate the actual stress condition in diversified detection scenes, and provide reliable data support for the stability evaluation of the asphalt mixture. Since the specifications, hardness and stress conditions required for simulation of different asphalt samples are different, the elastic coefficient and compression amount of the spiral spring can be selected and adjusted according to actual requirements. For samples that need to bear a large pressure, a spiral spring with a larger elastic coefficient can be selected to provide stronger support force; and for relatively fragile samples, a spring with a smaller elastic coefficient can be used to avoid damage to the sample due to excessive elastic force. In addition, by adjusting the installation position of the spring on the vertical plate 1312 and the connecting rod mechanism 133, the initial compression state of the spring can also be changed, thereby further optimizing the support and buffering effect on the sample, so that the equipment can adapt to diversified detection scenes, and the flexibility and reliability of detection are improved.

[0098] As shown in Figures 3-5As shown, in this embodiment, the optimized linkage mechanism 133 includes a plurality of interconnected connecting rods 1331, which can realize movement in a specific direction; the connecting rods 1331 are provided with grippers 1332, which contact the asphalt sample to be tested.

[0099] In this technical solution, the linkage mechanism 133 is designed to achieve precise positioning, stable clamping, and flexible motion control of the asphalt sample, meeting the requirements of simulating complex stress environments during asphalt mixture stability testing. Multiple hinged connecting rods 1331 allow for multi-angle and multi-directional positional adjustments of the sample, ensuring it is accurately positioned for testing. The contact between the gripper 1332 and the sample provides a stable clamping force, preventing displacement or shaking due to pressure, water flow, or other factors during testing. This ensures uniform force distribution on the sample, improving the accuracy and reliability of the test results and providing effective technical support for asphalt mixture stability assessment.

[0100] Working Principle: The linkage mechanism 133 consists of multiple hinged connecting rods 1331, which gives the mechanism extremely high flexibility. Each hinge point allows the connecting rod 1331 to rotate freely within a certain angle range. Through the coordinated rotation of different connecting rods 1331, movement in a specific direction can be achieved. When the asphalt sample is adjusted to the center position of the test chamber 1, the operator drives the operating rod 1341 through the operating component 134. The operating rod 1341 drives the connected connecting rods 1331 to move. The rotation of the hinge points between the connecting rods 1331 causes the entire linkage mechanism 133 to deform accordingly, thereby accurately moving to the target position and causing the gripper 1332 to rotate to the required angle, thus positioning the sample. When it is necessary to clamp or release the sample, the movement of the operating rod 1341 causes the gripper 1332 to perform corresponding opening and closing actions through the linkage mechanism 133, realizing the clamping or releasing operation of the sample. Through the close cooperation between the operating component 134 and the linkage mechanism 133, operators can conveniently and quickly position and clamp asphalt samples, improving the efficiency and accuracy of the testing work. This flexible movement method can adapt to asphalt samples of different shapes and sizes as well as diverse testing needs, ensuring that the sample is in the optimal testing position during the testing process.

[0101] like Figure 5 As shown, in this embodiment, the optimized operating component 134 further includes a limiting structure 14, which limits the travel of the operating lever 1341 and prevents the operating lever 1341 from moving excessively.

[0102] In the technical solution, the limiting structure 14 is arranged in the operating component 134, mainly to ensure the safe operation of the asphalt mixture stability detection equipment and the accuracy of the detection results. On the one hand, the over-movement of the operating rod 1341 is prevented to cause the components such as the connecting rod mechanism 133 and the clamping jaw 1332 to exceed the normal working range, to avoid damaging the equipment structure, such as the deformation of the connecting rod 1331 and the fracture of the clamping jaw 1332, and to prolong the service life of the equipment. On the other hand, the over-movement of the operating rod 1341 is prevented to cause the asphalt sample to be subjected to abnormal external force, to prevent the sample from being displaced or damaged, to ensure that the sample is in a stable and reliable state during the detection, and to ensure that the detection results truly reflect the stability of the asphalt mixture.

[0103] Embodiment 5:

[0104] The embodiment provides a detection method of the asphalt mixture stability detection equipment, in addition to the technical solutions of the above embodiments, and has the following technical features.

[0105] As shown in Figures 1-5 In the embodiment, the optimization includes the following steps:

[0106] S1: Placing a plurality of same-sized asphalt samples to be tested on the fixing frame 2 of each test chamber 1;

[0107] S2: Fixing the sample on the fixing frame 2 of the test chamber 1 through the positioning mechanism 13, then adding water to the test chamber 1 and the storage chamber 3 to a predetermined water level, closing the flow limiting valve 41 in the drain pipe 4, adding additional water to the test chamber 1 to completely cover the sample, and then sealing the test chamber 1;

[0108] S3: Setting the pressure change, temperature and other detection parameters through the controller unit 11, starting the pressurized air source 8 and the heating element 6, the pressurized air source 8 simulating the tire rolling stress according to a preset pressure curve, the test chamber 1 is pressurized by the pressurized air of a predetermined pressure applied to the test chamber 1 through the air hose 82, so that the water enters the sample; the test chamber 1 is maintained at a set temperature by controlling the heating element 6, the sample performance change is accelerated, a predetermined adjustment pressure is established in the test chamber 1 and maintained for a predetermined period of time;

[0109] S4: Opening the flow limiting valve 41 in the drain pipe 4, the pressurized air in the test chamber 1 forces the water to enter the storage chamber 3 from the test chamber 1 through the drain pipe 4, until the water level in the test chamber 1 drops to the predetermined water level;

[0110] S5: Releasing the pressurized air in the test chamber 1 to restore the test chamber 1 to atmospheric pressure, and the water in the storage chamber 3 returns to the test chamber 1 through the inflow pipe 5;

[0111] S6: repeating the above-mentioned cycle of alternating pressurization and depressurization, accelerating the process to subject the sample to the action of the tire on the asphalt pavement to evaluate the quality of the asphalt; at the end of the test, the density detection unit 9 measures the density of the sample, which is compared with the density before the test, and the stability of the asphalt mixture is evaluated on the basis of the variation in density.

[0112] The embodiments of the present application are described above with reference to the drawings, and the embodiments and features in the embodiments of the present application can be combined with each other without conflict, and the present application is not limited to the specific embodiments described above, which are merely illustrative rather than restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection of the present application.

Claims

1. An asphalt mixture stability detection apparatus, characterized by, The application relates to a sealed test chamber (1) for placing an asphalt sample to be tested, a fixing frame (2) arranged in the test chamber (1) for supporting the asphalt sample, a storage chamber (3) for receiving water from the test chamber (1), a drain pipe (4) arranged between the test chamber (1) and the storage chamber (3), a flow-limiting valve (41) arranged on the drain pipe (4) for controlling the flow of water from the test chamber (1) to the storage chamber (3), an inflow pipe (5) arranged between the test chamber (1) and the storage chamber (3), a check valve (51) arranged on the inflow pipe (5) for allowing water to flow from the storage chamber (3) into the test chamber (1), a heating element (6) arranged in the test chamber (1) for keeping the water in the test chamber (1) and the storage chamber (3) at a constant temperature, a temperature sensor (61) arranged in the test chamber (1) for detecting the temperature in the test chamber (1) and controlling the temperature change of the heating element (6), a water level sensor (7) arranged in the test chamber (1) for detecting the water level in the test chamber (1), a pressurized air source (8) connected to the test chamber (1) through an air hose (82) for providing pressurized air to the test chamber (1) to simulate the initial pressure when a tire contacts an asphalt surface and the subsequent pore pressure caused by water entering the pores, a pressure sensor (81) arranged in the test chamber (1) and electrically connected to the pressurized air source (8) for monitoring the pressure value in the test chamber (1) in real time, and a density detection unit (9) for detecting the density change of the asphalt sample, comparing the density before detection, and evaluating the stability of the asphalt mixture according to the density change. The test chamber (1) has at least two or more. The drain pipe (4) and the inflow pipe (5) are provided with filter screens (10) inside for preventing sample debris from entering the pipes. The application further comprises a controller unit (11) electrically connected to the temperature sensor (61), the water level sensor (7), the pressure sensor (81) and the flow-limiting valve (41) for controlling the pressure application, temperature control, water level adjustment and water adding operation of each test chamber (1); the controller unit (11) is connected to the pressurized air source (8) for controlling the application of a specified level of air pressure to each test chamber (1) to ensure that the pressure can be accurately applied according to the set pressure curve to simulate the pressure change at different stages in the tire rolling process. The application further comprises a pressure relief valve (12) arranged on the test chamber (1) for pressure relief when the pressure in the test chamber (1) is abnormal. The application further comprises a positioning mechanism (13) comprising a support assembly (131) comprising a bottom base (1311) and a vertical plate (1312) arranged on the base (1311), and an elastic supporting component (132) arranged on the support assembly (131) for providing elastic buffering or supporting force. ​ ​ ​ ​ ​ ​ ​ ​ 2. The bituminous mixture stability detection device according to claim 1, characterized in that, ​ 3. The asphalt mixture stability detection device according to claim 2, characterized in that, ​ 4. The asphalt mixture stability detection device according to claim 3, characterized in that, ​ 5. The asphalt mixture stability detection device according to claim 4, wherein ​ 6. The asphalt mixture stability detection device according to claim 5, wherein ​ ​ ​ A connecting rod mechanism (133) is connected between the support assembly (131) and the asphalt sample to be tested for transmitting motion and force; An operating component (134) is used to control or drive the motion of the support assembly (131) in cooperation with the connecting rod mechanism (133), and the operating component (134) comprises at least one movable operating lever (1341) for driving the connecting rod mechanism (133) to move through the motion of the operating lever (1341).

7. The asphalt mixture stability detection device according to claim 6, wherein The elastic support component (132) is a coil spring, one end of which is fixed to the vertical plate (1312), and the other end is connected to the corresponding connecting point of the connecting rod mechanism (133).

8. The asphalt mixture stability detection device according to claim 7, characterized in that, The connecting rod mechanism (133) comprises a plurality of connecting rods (1331) hingedly connected to each other to realize the motion in a specific direction, and the connecting rods (1331) are provided with clamping jaws (1332) in contact with the asphalt sample to be tested.

9. The asphalt mixture stability detection device according to claim 8, wherein, The operating component (134) further comprises a limiting structure (14) for limiting the motion stroke of the operating lever (1341) to prevent excessive motion of the operating lever (1341).

10. A detection method for the bituminous mixture stability detection apparatus according to claim 9, characterized in that, The method comprises the following steps: S1: Placing a plurality of same-sized asphalt samples to be tested on the fixing frame (2) of each test chamber (1); S2: Fixing the samples on the fixing frame (2) of the test chamber (1) through the positioning mechanism (13), then adding water to the test chamber (1) and the storage chamber (3) to a predetermined water level, closing the flow limiting valve (41) in the drain pipe (4), adding additional water to the test chamber (1) to completely cover the samples, and then sealing the test chamber (1); S3: Setting the detection parameters such as pressure change and temperature through the controller unit (11), starting the pressurized air source (8) and the heating element (6), the pressurized air source (8) simulates the tire rolling stress according to the preset pressure curve, the test chamber (1) is pressurized by the pressurized air with a predetermined pressure applied to the test chamber (1) through the air hose (82), and the water is forced into the sample; The test chamber (1) is maintained at a set temperature by controlling the heating element (6) to accelerate the performance change of the sample, a predetermined adjustment pressure is established in the test chamber (1) and maintained for a predetermined period of time; S4: Opening the flow limiting valve (41) in the drain pipe (4), the pressurized air in the test chamber (1) forces the water to flow from the test chamber (1) to the storage chamber (3) through the drain pipe (4) until the water level in the test chamber (1) drops to a predetermined level; S5: Releasing the pressurized air in the test chamber (1) to restore the test chamber (1) to atmospheric pressure, and the water in the storage chamber (3) returns to the test chamber (1) through the inflow pipe (5); S6: Repeating the above-mentioned alternating pressurization and depressurization cycle to accelerate the process to make the sample subjected to the effect of the tire on the asphalt pavement to evaluate the quality of the asphalt; after the detection is completed, the density detection unit (9) measures the density of the sample, compares it with the density before the detection, and evaluates the stability of the asphalt mixture according to the change of the density.

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