Road surface fatigue performance testing device

Abstract

The utility model discloses a pavement fatigue performance testing device, and relates to the technical field of pavement performance testing, the pavement fatigue performance testing device comprises a loading device, a driving device, at least one loading wheel and at least one brake assembly, the loading device comprises a frame and a first telescopic device, and the first telescopic device is fixedly connected to the frame; the driving device is fixedly connected with the output end of the first telescopic device; each loading wheel can be connected with the output end of the driving device, the first telescopic device can drive each loading wheel to be in contact with or separated from a to-be-tested surface of a test piece by stretching out and drawing back in the axial direction of the first telescopic device, and the driving device can drive each loading wheel to rotate around a loading axis perpendicular to the to-be-tested surface; each loading wheel corresponds to at least one brake assembly, and each brake assembly can provide braking force for the corresponding loading wheel. According to the utility model, continuous and long-time loading can be realized while the equipment volume is reduced, so that the test efficiency can be improved; and the authenticity, accuracy and comprehensiveness of the test can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of road performance testing, in particular to a road fatigue performance testing device. Background Art

[0002] Asphalt pavement fatigue involves issues such as pavement wear and service life, and is an important issue related to driver safety. The main cause of asphalt pavement fatigue is the effect of traffic load, that is, asphalt roads will gradually age during long-term vehicle rolling, resulting in pavement defects such as cracks and potholes. Therefore, the impact of traffic load on pavement fatigue performance is the focus of research.

[0003] The mainstream pavement fatigue performance test method in the industry is the full-scale pavement loading test method, which is to accelerate the evolution of the pavement by paving roads of different structural forms, controlling the same test conditions, and using heavy-duty loading vehicles to load the roads, so as to obtain data on the entire life cycle of the road in a shorter time. This method requires a larger site to pave the road, and requires special human-driven vehicles to load the road, which occupies a large space and has a high test cost.

[0004] Chinese patent CN217878729U provides an asphalt mixture fatigue test device, including an electric skateboard module, a simulated wheel module and a specimen module. The specimen module is fixed on the electric skateboard module as a whole. The electric skateboard module carries the specimen module to perform reciprocating motion. The simulated wheel module is fixedly connected to the loading pressure column of the test machine and contacts the upper surface of the specimen module, thereby simulating the rolling of the road by the engineering vehicle. The test device needs to load through the reciprocating motion of the specimen module, and cannot achieve continuous loading well, which affects the test efficiency; if the specimen module is to be continuously loaded for a long time, the length of the electric skateboard module and the specimen module needs to be large, resulting in a relatively large test equipment and increased test costs. Utility Model Content

[0005] The purpose of the utility model is to provide a road fatigue performance testing device to solve the problems existing in the above-mentioned prior art, which can reduce the size of the equipment while achieving continuous and long-term loading, which is conducive to improving the test efficiency; and can improve the authenticity, accuracy and comprehensiveness of the test.

[0006] To achieve the above purpose, the utility model provides the following solutions:

[0007] The utility model provides a road fatigue performance testing device, comprising a loading device, a driving device, at least one loading wheel and at least one brake assembly, wherein:

[0008] The loading device comprises a frame and a first telescopic device, wherein the first telescopic device is fixedly connected to the frame;

[0009] The driving device is used to be fixedly connected to the output end of the first telescopic device;

[0010] Each of the loading wheels can be connected to the output end of the driving device, the first telescopic device can drive each of the loading wheels to contact or break contact with the test surface of the specimen by telescoping along its own axial direction, and the driving device can drive each of the loading wheels to rotate around a loading axis perpendicular to the test surface;

[0011] Each of the loading wheels corresponds to at least one of the brake assemblies, and each of the brake assemblies can provide braking force for the corresponding loading wheel.

[0012] Preferably, each of the brake assemblies includes a second telescopic device and a brake body, each of the brake bodies is fixedly connected to one of the second telescopic devices, each of the telescopic devices can drive the corresponding brake body to move in a direction toward or away from the center of the corresponding loading wheel, and each of the brake bodies can contact one of the loading wheels and can provide braking force for the corresponding loading wheel.

[0013] Preferably, it also includes a connecting frame, there are multiple loading wheels, one end of the connecting frame is fixedly connected to the output end of the driving device, and the other end of the connecting frame is rotatably connected to the multiple loading wheels, and the driving device can drive all the loading wheels to rotate around the same loading axis.

[0014] Preferably, it further comprises an interaction device, and the interaction device can be connected to the driving device by signal.

[0015] Preferably, the interaction device can be connected to the first telescopic device by signal.

[0016] Preferably, the interaction device can be connected to the second telescopic device by signal.

[0017] Preferably, it further comprises a pressure detection device, which is arranged between the first telescopic device and the connecting frame, and the pressure detection device can detect the loading force of the loading device acting on the connecting frame.

[0018] Preferably, the test piece is further included, and the test piece is used to be arranged below the loading wheel.

[0019] Compared with the prior art, the utility model has achieved the following technical effects:

[0020] The utility model provides a road fatigue performance testing device, including a loading device, a driving device, at least one loading wheel and at least one brake assembly. The loading device includes a frame and a first telescopic device. The first telescopic device can drive each loading wheel to contact or disengage with the test surface of the specimen by telescoping along its own axial direction. The driving device can drive each loading wheel to rotate around a loading axis perpendicular to the test surface; each brake assembly can provide braking force for the corresponding loading wheel. The utility model applies an annular load to the specimen by driving the loading wheel to rotate around the loading axis, thereby realizing continuous and long-term loading, and there is no need to expand the size of the test equipment and the specimen according to the duration of continuous loading. It can reduce the volume of the equipment while realizing continuous and long-term loading, which is conducive to improving the test efficiency. At the same time, the brake assembly can brake the loading wheel, thereby simulating the vehicle braking condition during the vehicle form process, and then simulating the lateral shear force applied to the road surface when the vehicle brakes; the first telescopic device can provide a vertical loading force for the loading wheel by driving the loading wheel to move downward, which can more realistically simulate the force on the road surface during the vehicle form, and improve the authenticity, accuracy and comprehensiveness of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The structure diagram of the road fatigue performance testing device provided by the utility model is as follows: Figure 1 ;

[0023] Figure 2 A front view of the pavement fatigue performance testing device provided by the utility model;

[0024] Figure 3 This is a left view of the pavement fatigue performance testing device provided by the utility model;

[0025] Figure 4 A schematic diagram of the structure of the loading device provided by the utility model;

[0026] Figure 5 The structure diagram of the road fatigue performance testing device provided by the utility model is as follows: Figure 2 (excluding frame and base);

[0027] In the figure: 100, road fatigue performance testing device; 1, loading device; 101, frame; 102, first telescopic device; 2, driving device; 3, loading wheel; 4, brake assembly; 401, second telescopic device; 402, brake body; 5, connecting frame; 6, interactive device; 7, pressure detection device; 8, test piece; 9, base; 10, transmission shaft. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The purpose of the utility model is to provide a road fatigue performance testing device to solve the problems existing in the above-mentioned prior art, which can reduce the size of the equipment while achieving continuous and long-term loading, which is conducive to improving the test efficiency; and can improve the authenticity, accuracy and comprehensiveness of the test.

[0030] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1-5As shown, the utility model provides a road fatigue performance test device 100, including a loading device 1, a driving device 2, at least one loading wheel 3 and at least one brake assembly 4. The loading device 1 includes a frame 101 and a first telescopic device 102, and the first telescopic device 102 is fixedly connected to the frame 101; the driving device 2 is used to be fixedly connected to the output end of the first telescopic device 102; each loading wheel 3 can be connected to the output end of the driving device 2, and the first telescopic device 102 can drive each loading wheel 3 to contact or disengage with the test surface of the specimen 8 by telescoping along its own axial direction, and the driving device 2 can drive each loading wheel 3 to rotate around a loading axis perpendicular to the test surface; each loading wheel 3 corresponds to at least one brake assembly 4, and each brake assembly 4 can provide braking force for the corresponding loading wheel 3. The utility model applies an annular load to the specimen 8 by driving the loading wheel 3 to rotate around the loading axis, thereby realizing continuous and long-term loading, and there is no need to expand the size of the test equipment and the specimen 8 according to the duration of continuous loading, and can reduce the volume of the equipment while realizing continuous and long-term loading, which is conducive to improving the test efficiency. At the same time, the first telescopic device 102 can provide a vertical loading force for the loading wheel 3 by driving the loading wheel 3 to move downward. The loading wheel 3 contacts and rubs against the road surface, simulating the interaction between the loading wheel 3 and the road surface when the vehicle is in the form of a vehicle; the brake assembly 4 can brake the loading wheel 3, thereby simulating the vehicle braking condition during the vehicle form process, and then simulating the lateral shear force applied to the road surface when the vehicle is braked, thereby more realistically simulating the force on the road surface when the vehicle is in the form of a vehicle, thereby improving the authenticity, accuracy and comprehensiveness of the test.

[0032] In the utility model, each brake assembly 4 includes a second telescopic device 401 and a brake body 402. Each brake body 402 is fixedly connected to a second telescopic device 401. Each telescopic device can drive the corresponding brake body 402 to move toward or away from the center of the corresponding loading wheel 3. Each brake body 402 can contact a loading wheel 3 and can provide braking force for the corresponding loading wheel 3.

[0033] The utility model also includes a connecting frame 5, a plurality of loading wheels 3, one end of the connecting frame 5 is fixedly connected to the output end of the driving device 2, and the other end of the connecting frame 5 is rotatably connected to the plurality of loading wheels 3, and the driving device 2 can drive all the loading wheels 3 to rotate around the same loading axis. The plurality of loading wheels 3 can load the same annular area of ​​the specimen 8, which can accelerate the evolution process of the road surface, better simulate the driving conditions of vehicles on daily roads, and can efficiently detect the fatigue resistance of the road surface in a short time.

[0034] As a preferred embodiment, there are two loading wheels 3, and the connecting frame 5 includes a crossbeam and four connecting columns. Two connecting columns are fixedly connected to each end of the crossbeam, and an installation gap is left between the two connecting columns at the same end of the crossbeam. A loading wheel 3 is arranged between the two connecting columns at the same end of the crossbeam, and each loading wheel 3 is rotatably connected to the corresponding two connecting columns; the crossbeam and the driving device 2 are fixedly connected via a transmission shaft 10.

[0035] As a preferred embodiment, a brake assembly 4 is provided in each installation gap, a second telescopic device 401 is fixedly connected to the cross beam, an output end of the second telescopic device 401 is provided at one end of the cross beam close to the loading wheel 3, and a brake body 402 is provided between the second telescopic device 401 and the loading wheel 3. The vehicle body is preferably a brake pad.

[0036] The present invention further includes an interactive device 6, which is preferably a numerical control screen, and can be connected to the drive device 2 by signal. The interactive device 6 can be used to input the initial driving speed, driving acceleration and loading time of the drive device 2, and control the drive device 2 to achieve accelerated output, so that the drive device 2 drives the loading wheel 3 to accelerate, realize accelerated loading, simulate the working condition of the vehicle accelerating on the road surface, and increase the multidimensionality of asphalt road surface measurement.

[0037] In the present invention, the interactive device 6 can be connected to the first telescopic device 102 by signal. The interactive device 6 can be used to input the elongation length of the first telescopic device 102, so as to adjust the vertical loading force of the loading wheel 3.

[0038] In the present invention, the interactive device 6 can be connected to the second telescopic device 401 by signal. The interactive device 6 can be used to input the extension length of the second telescopic device 401, so as to adjust the braking force applied by the brake body 402 to the loading wheel 3.

[0039] The present invention further comprises a pressure detection device 7, which is arranged between the first telescopic device 102 and the connecting frame 5, and can detect the loading force of the loading device 1 acting on the connecting frame 5. The pressure detection device 7 is preferably a force sensor.

[0040] The present invention further comprises a test piece 8, which is used to be arranged below the loading wheel 3. The test piece 8 is preferably an asphalt pavement test piece 8.

[0041] In the present invention, the loading device 1 further comprises a base 9 , which is fixedly connected to the lower end of the frame 101 , and the base 9 is used to place the test piece 8 .

[0042] The present invention also includes a rutting depth detection device, which is preferably a laser displacement sensor, and can be installed on the frame 101. The rutting depth detection device can detect the rutting depth on the test piece 8 after the test. As a preferred embodiment, the rutting depth detection device is communicatively connected with the interactive device 6, and the interactive device 6 can display the detection result of the rutting depth detection device.

[0043] As a preferred embodiment, the frame 101 is a reaction frame, the loading wheel 3 is a rubber wheel, and the driving device 2 is a motor.

[0044] The specific operation steps of the pavement fatigue performance testing device 100 provided by the utility model are as follows:

[0045] Step 1: Lay the asphalt mixture specimen 8 to be subjected to the loading test on the base 9 and fix it on the reaction frame.

[0046] Step 2: Connect the power supply, turn on the CNC screen, and set the loading pressure, motor speed and duration through the CNC screen.

[0047] Step 3: The CNC screen controls the first telescopic device 102 to start applying pressure, and the motor starts running, driving the transmission shaft 10 to rotate, the transmission shaft 10 drives the connecting frame 5 to rotate, and the connecting frame 5 drives the rubber wheel to move with the asphalt mixture specimen 8 according to the setting, and starts circular acceleration loading.

[0048] Step 4: The second telescopic device 401 is extended by controlling the numerical control screen to drive the brake pad to brake the loading wheel 3, thereby providing a lateral shear force load for the test piece 8. The road surface anti-stripping, anti-cracking, and anti-rutting deformation capabilities are reflected by recording the cracking and other road surface disasters of the test piece 8. At the same time, the rutting condition of the road surface material is tested by observing and measuring the rutting depth of the rubber wheel in the asphalt mixture test piece 8.

[0049] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A road fatigue performance testing device, characterized in that: The invention comprises a loading device, a driving device, at least one loading wheel and at least one brake assembly, wherein: The loading device comprises a frame and a first telescopic device, wherein the first telescopic device is fixedly connected to the frame; The driving device is used to be fixedly connected to the output end of the first telescopic device; Each of the loading wheels can be connected to the output end of the driving device, the first telescopic device can drive each of the loading wheels to contact or break contact with the test surface of the specimen by telescoping along its own axial direction, and the driving device can drive each of the loading wheels to rotate around a loading axis perpendicular to the test surface; Each of the loading wheels corresponds to at least one of the brake assemblies, and each of the brake assemblies can provide braking force for the corresponding loading wheel.

2. The pavement fatigue performance testing device according to claim 1, characterized in that: Each of the brake assemblies includes a second telescopic device and a brake body. Each of the brake bodies is fixedly connected to one of the second telescopic devices. Each of the telescopic devices can drive the corresponding brake body to move in a direction toward or away from the center of the corresponding loading wheel. Each of the brake bodies can contact one of the loading wheels and can provide braking force for the corresponding loading wheel.

3. The pavement fatigue performance testing device according to claim 1, characterized in that: It also includes a connecting frame, the loading wheels are multiple, one end of the connecting frame is fixedly connected to the output end of the driving device, and the other end of the connecting frame is rotatably connected to the multiple loading wheels, and the driving device can drive all the loading wheels to rotate around the same loading axis.

4. The road surface fatigue performance testing device according to claim 2, characterized in that: An interaction device is also included, and the interaction device can be connected to the driving device by signal.

5. The road surface fatigue performance testing device according to claim 4, characterized in that: The interaction device can be connected to the first telescopic device by signal.

6. The road surface fatigue performance testing device according to claim 4, characterized in that: The interaction device can be signal-connected to the second telescopic device.

7. The road surface fatigue performance testing device according to claim 3, characterized in that: It also includes a pressure detection device, which is arranged between the first telescopic device and the connecting frame, and the pressure detection device can detect the loading force of the loading device acting on the connecting frame.

8. The road surface fatigue performance testing device according to claim 1, characterized in that: Also included is the test piece, which is used to be arranged below the loading wheel.

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