A pendulum type test loading device for simulating the action of vehicle loads

Abstract

The utility model discloses a pendulum type test loading device of simulating vehicle load action, including a pair of linear track and the horizontal movement platform on a pair of linear track, and with the detachable connection of horizontal movement platform's tertiary pendulum loading device, be equipped with test box body below pendulum loading device, be provided with the backfilling material buried waste tire test sample and the earth pressure cell of built -in sensor in test box body, be controlled by control system and be driven the pendulum of bottom to swing tertiary pendulum mechanism, carry out loading test to waste tire test sample. The device can not only realize the application of dynamic load, but also can more truly reflect the stress and deformation characteristics of waste tire-soil composite subgrade under actual working conditions by simulating the dynamic load applied by vehicles in driving state, and the device has high safety performance, good applicability and is more in line with actual conditions, providing reliable test basis for road engineering design.

Description

Technical Field

[0001] This utility model relates to road engineering and soil mechanics experimental equipment, specifically a pendulum-type test loading device for simulating vehicle load. Background Technology

[0002] Waste tires are readily available, low-carbon, environmentally friendly, and have good toughness. Burying waste tires in the soil integrates them with the soil and adjacent soil layers, reducing roadbed settlement and alleviating stress concentration. This technology has gradually attracted attention from various fields such as geotechnical engineering and road engineering. In engineering projects, placing waste tires in the soil at specific locations and in specific arrangements creates a reinforcing effect, thereby solving problems related to structural stability and deformation, making the project safer.

[0003] For a composite of waste tires and soil, the frictional properties between the waste tires and the soil are what affect the overall stability of the foundation. Since the waste tires are used as reinforcement material in the foundation, it is necessary to conduct overall loading tests on the specimens, using multiple loading cycles at different frequencies to evaluate the mechanical properties of the reinforcement material on the overall soil.

[0004] In soil mechanics research, traditional axial compression testing equipment can only apply static loads and cannot simulate the dynamic loads generated by vehicles traveling on the roadbed under actual working conditions. This leads to a certain difference between experimental results and the effects in actual engineering, especially when using waste tire-soil composite materials as roadbed materials, where the impact of dynamic loads on their mechanical properties is particularly significant. Composite roadbeds combining waste tires and soil have unique characteristics in terms of bearing capacity and deformation properties, therefore, experimental evaluation based on their actual application is necessary. Utility Model Content

[0005] To address the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide a pendulum-type test loading device for simulating vehicle loads that has high safety performance and good applicability. By simulating the dynamic load applied to the roadbed by a vehicle in motion, it can not only realize the application of dynamic loads, but also more realistically reflect the stress and deformation characteristics of waste tire-soil composite roadbeds under actual working conditions.

[0006] This utility model is achieved through the following technical solution.

[0007] One aspect of this utility model provides a pendulum-type test loading device for simulating vehicle load, including a pair of linear tracks and a horizontal moving platform located on the pair of linear tracks, as well as a pendulum loading device detachably connected to the horizontal moving platform. A test chamber is provided below the pendulum loading device, and a waste tire sample buried with backfill material and a soil pressure box with built-in sensors are provided inside the test chamber.

[0008] It also includes a control system electrically connected to the pendulum loading device and sensors;

[0009] The pendulum loading device includes a three-stage pendulum mechanism, which is controlled by a control system to drive the pendulum at the bottom to swing and perform a loading test on the waste tire sample.

[0010] Preferably, the linear track has an I-shaped structure, with linear guide rails provided on the web of the I-shaped track. The horizontal moving platform is slidably connected along a pair of linear guide rails, and shims are provided at both ends of the linear track.

[0011] Preferably, the horizontal moving platform includes a moving platform device, the bottom of which is provided with wheels and a slot for connecting a pendulum loading device.

[0012] Preferably, a signal transmitting and receiving device is provided at the front end of the mobile platform device, and the signal transmitting and receiving device is electrically connected to the control system located on the side of the test chamber.

[0013] Preferably, the pendulum loading device includes a primary pendulum mechanism, a secondary pendulum mechanism, a pendulum arm connecting rod, and a pendulum weight. The primary pendulum mechanism is connected to the slot of the moving platform device by a primary pin. The secondary pendulum mechanism is connected to the primary pendulum mechanism by a secondary pin. The pendulum arm connecting rod is connected to the secondary pendulum mechanism by a tertiary pin. The pendulum weight is connected below the pendulum arm connecting rod.

[0014] Preferably, the secondary pendulum mechanism is a pendulum arm structure, with the secondary pin connected to the upper part of the pendulum arm.

[0015] Preferably, a servo valve electrically connected to the control system is connected inside the primary pin.

[0016] As a preferred option, the test chamber has a double-layer structure, with the waste tire sample placed in the inner test chamber, and a combination structure of dampers and springs installed in the steel box interlayer.

[0017] Preferably, the inner side of the test chamber is made of steel plate, and reinforcing ribs are provided at the four corners of the outer side of the test chamber.

[0018] As a preferred option, multiple earth pressure cells are embedded inside the test chamber. The embedding depth and location are marked on the outside of the steel box. The earth pressure cells are connected to the control system, and earth pressure sensors are installed inside the earth pressure cells.

[0019] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:

[0020] 1. Through the pendulum structure design, dynamic loads of different frequencies and waveforms can be applied to the specimen multiple times, effectively simulating the dynamic load on the roadbed during vehicle operation, simulating the role of composite materials in actual engineering, and more realistically reflecting the data of composite materials in actual engineering. This overcomes the shortcomings of static loading in previous axial compression test equipment, is more in line with actual conditions, and provides reliable test basis for road engineering design.

[0021] 3. The pendulum-type test loading device of this utility model adopts a three-section mechanical pendulum arm design, and the sections are detachably connected, which facilitates transportation and storage; the angle of the pendulum arm can be adjusted through the operating system, so that the test chamber can safely and smoothly enter the test area, improving the portability and operational safety of the device.

[0022] 3. This device can automatically position the specimen for loading tests by controlling the horizontal moving platform through the operating system, avoiding the need for hoisting the loading device. The loading process is automatically controlled and data is monitored in real time, improving test efficiency and safety. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the pendulum-type test loading device for simulating vehicle load according to this utility model.

[0025] Figure 2 This is a side view of the linear track moving platform and pendulum loading device of this utility model;

[0026] Figure 3 This is a three-dimensional structural diagram of the linear track moving platform and pendulum loading device of this utility model;

[0027] Figure 4 This is a bottom view of the three-dimensional structure of the linear track moving platform and pendulum loading device of this utility model.

[0028] In the diagram, 1 - straight track, 101 - left straight track, 102 - right straight track;

[0029] 2-Horizontal moving platform, 201-Moving platform device, 202-Wheel, 203-Slot;

[0030] 3-First-stage pendulum mechanism, 301-First-stage pin;

[0031] 4-Secondary pendulum mechanism, 401-Secondary pin;

[0032] 5-Swing arm connecting rod, 501-Third-stage pin;

[0033] 6-Pendulum, 7-Test chamber, 701-Damper, 702-Spring, 703-Internal test chamber;

[0034] 8-Control system, 801-Signal transmitting and receiving device. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0036] like Figure 1 , Figure 2 As shown in the figure, the present invention provides a pendulum-type test loading device for simulating vehicle load, including a pair of straight tracks 1 (left straight track 101 and right straight track 102), a horizontal moving platform 2 located on the pair of straight tracks 1, and a pendulum loading device detachably connected to the horizontal moving platform 2. A test chamber 7 is provided below the pendulum loading device, and a waste tire sample buried in backfill material is placed in the test chamber.

[0037] In this embodiment, as Figure 3 As shown, the linear track 1 has an I-shaped structure, with linear guide rails installed on the web of the I-shaped linear track 1. The horizontal moving platform 2 is slidably connected along the linear guide rails of the pair of I-shaped linear tracks 1. Shims are provided at both ends of the linear track 1 to buffer and reduce speed. The linear track 1 and the horizontal moving platform 2 are made of high-strength materials to ensure the overall rigidity and stability of the device during loading.

[0038] In this example, as Figure 4 As shown, the horizontal moving platform 2 includes a moving platform device 201. The bottom of the moving platform device 201 is provided with wheels 202. The moving platform device 201 can move along the linear guide rails of the left straight track 101 and the right straight track 102. The bottom of the web plate of the moving platform device 201 is provided with a slot 203 for connecting a pendulum loading device.

[0039] A signal transmitting and receiving device 801 is provided at the front end of the mobile platform device 201, and the signal transmitting and receiving device 801 is electrically connected to the control system 8 located on the side of the test chamber 7. Initial planar positioning can be performed through the signal transmitting and receiving device 801 and the control system 8 to ensure the smooth conduct of the test.

[0040] In this embodiment, the pendulum loading device includes a primary pendulum mechanism 3, a secondary pendulum mechanism 4, a pendulum arm connecting rod 5, and a pendulum 6. The primary pendulum mechanism 3 is connected to the slot 203 of the mobile platform device 201 by a primary pin 301. The primary pin 301 is reinforced on both sides by bolts. The connection part is provided with a slot and bolt groove (not shown in the figure).

[0041] The secondary pendulum mechanism 4 is connected to the primary pendulum mechanism 3 via a secondary pin 401. The secondary pendulum mechanism 4 is a pendulum arm structure. The secondary pin 401 is connected to the upper part of the pendulum arm, and the lower part of the pendulum arm is connected to the pendulum 6 with the pendulum arm connecting rod 5 via a tertiary pin 501.

[0042] The pendulum mechanism has three mechanical swing arms, each of which can be detachably connected, allowing it to be selectively placed in a storage box. The angle of the pendulum can also be adjusted to fold the pendulum so that the test chamber can be safely moved into the test area.

[0043] The test chamber 7 is located below the pendulum 6. The test chamber 7 has a double-layer structure. The waste tire sample is placed in the internal test chamber 703. A combination structure of damper 701 and spring 702 is set in the steel box interlayer. The damper 701 and spring 702 respectively absorb vibration energy and provide elastic buffer. When the test chamber is subjected to dynamic load and transient impact, it can effectively alleviate and dissipate the energy transferred to the box structure, ensuring that the test chamber can quickly return to the initial state during the test.

[0044] The width of the internal test chamber 703 of the test chamber 7 should meet the swing amplitude range of the pendulum 6.

[0045] In this embodiment, the waste tires in the test chamber can be full-size or reduced-size tires, which can be selected according to the test requirements. In this embodiment, the inner side of the test chamber is made of 10mm thick steel plate, and reinforcing ribs are set at the four corners of the outer side of the test chamber to improve the overall rigidity of the test chamber, ensure that there is no local deformation under dynamic load, and reduce the adverse effects on the test results.

[0046] In the above structure, multiple earth pressure cells are embedded inside the test chamber 7. The burial depth and position are marked on the outside of the steel box, and the earth pressure cells are connected to the data display terminal. The earth pressure cells are equipped with earth pressure sensors for monitoring and collecting data from waste tire experiments, and several other sensors not shown in the figure. When applying load, in this embodiment, a servo valve is connected inside the primary pin 301. By inputting the loading waveform and frequency to the control system 8, the computer controls the servo valve to drive the primary pin 301 to drive the secondary pin 401 and the pendulum 6 to apply a dynamic load. During the test, the frequency of the load can be selected according to specific needs. The frequency range of the applied dynamic load is 0Hz to 10Hz, and the loading waveform is a sine wave, half-sine wave, or other waveforms.

[0047] The control system includes a computer input panel, a control panel, and multiple data monitoring devices with digital display functions that are connected to the computer.

[0048] The device features a computer-controlled system for processing and monitoring data. Each testing and measuring device is connected to the computer, enabling the application of impact loads to waste tire-soil composite samples. Multiple impact load cycles can be selected. By adjusting the pendulum angle to change the degree of deflection during the test, the device can simulate vehicle driving and emergency braking conditions during the experiment. The resulting test data more accurately reflects the mechanical properties of the material, thus improving the test results.

[0049] The testing steps of this utility model device include robotic arm installation, specimen preparation, hoisting, and then formal loading. The specific operation steps are as follows:

[0050] S1: Push the horizontal moving platform 2 into the linear track 1 from one side, install the first-stage pendulum mechanism 3 into the slot 203 of the horizontal moving platform 2, and tighten the corresponding bolts. Connect the first-stage pendulum mechanism 3 and the second-stage pendulum mechanism 4 in sequence.

[0051] S2: Confirm the connection is aligned, and use a torque wrench to continue tightening to the predetermined torque to ensure that the connection has sufficient rigidity and that it does not loosen during the loading process.

[0052] S3: Apply Vaseline evenly to the inner surface of the test chamber 7, control the filling of soil according to the volume method, and place waste tires at a certain thickness layer. Compact the soil in layers according to the compaction requirements until it is flush with the steel box. Then, hoist the pressure plate to the designated position on the upper side of the steel box and perform sample pre-compression treatment.

[0053] S4: Adjust the relative angle between the primary pendulum mechanism 3 and the secondary pendulum mechanism 4 to allow the test chamber 7 to be placed. Use a lifting device to hoist the test chamber 7 to the predetermined position under the pendulum loading device, ensuring the test chamber moves smoothly during the process.

[0054] S5: After the test chamber 7 is positioned, adjust the relative angle between the first-stage pendulum mechanism 3 and the second-stage pendulum mechanism 4 according to the experimental requirements to suit the load test. Observe the angle sensor data during the adjustment process to ensure that the expected results are met.

[0055] S6: Connect the swing arm connecting rod 5 to the three-stage pin 501, and then connect the pendulum 6 to the swing arm connecting rod 5. During the preloading process, the control system 8 automatically controls the process and collects and processes feedback data in real time. After the preloading reaches the predetermined conditions, the control system 8 inputs the specified waveform to officially start the loading test.

[0056] S7: Start the loading test. Start the first-stage pin 301 so that the pendulum 6 dynamically loads the soil sample in the test chamber 7 until the test ends. After the test, remove multiple displacement sensors to facilitate the loading test of the next sample.

[0057] When testing composite soil, a large robotic arm can drive a small robotic arm to work. The angle and swing frequency at the connection point can be controlled by the operation control device. Adjusting the angle allows the loading device to work smoothly on the soil in the lower test chamber, ensuring that the soil is subjected to a uniform and predetermined load during the loading process, thereby obtaining more accurate test results.

[0058] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A pendulum-type test loading device for simulating vehicle load, characterized in that, It includes a pair of linear tracks (1) and a horizontal moving platform (2) located on the pair of linear tracks (1), as well as a pendulum loading device detachably connected to the horizontal moving platform (2). A test chamber (7) is provided below the pendulum loading device. The test chamber (7) contains waste tire samples buried with backfill and soil pressure boxes with built-in sensors. It also includes a control system (8) electrically connected to the pendulum loading device and the sensor; The pendulum loading device includes a three-stage pendulum mechanism. The control system (8) controls the three-stage pendulum mechanism to drive the pendulum (6) at the bottom to swing and perform a loading test on the waste tire sample.

2. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, The linear track (1) has an I-shaped structure. A linear guide rail is provided on the web of the I-shaped track. The horizontal moving platform (2) is slidably connected along a pair of linear guide rails. Shims are provided at both ends of the linear track (1).

3. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, The horizontal moving platform (2) includes a moving platform device (201), the bottom of which is provided with wheels (202) and a slot (203) for connecting the pendulum loading device.

4. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, A signal transmitting and receiving device (801) is provided at the front end of the mobile platform device (201), and the signal transmitting and receiving device (801) is electrically connected to the control system (8) located on the side of the test chamber (7).

5. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, The pendulum loading device includes a primary pendulum mechanism (3), a secondary pendulum mechanism (4), a pendulum arm connecting rod (5), and a pendulum (6). The primary pendulum mechanism (3) is connected to the slot (203) of the mobile platform device (201) by a primary pin (301). The secondary pendulum mechanism (4) is connected to the primary pendulum mechanism (3) by a secondary pin (401). The pendulum arm connecting rod (5) is connected to the secondary pendulum mechanism (4) by a tertiary pin (501). The pendulum (6) is connected below the pendulum arm connecting rod (5).

6. The pendulum-type test loading device for simulating vehicle load according to claim 5, characterized in that, The secondary pendulum mechanism (4) is a pendulum arm structure, with the secondary pin (401) connected to the upper part of the pendulum arm.

7. The pendulum-type test loading device for simulating vehicle load according to claim 5, characterized in that, A servo valve that is electrically connected to the control system (8) is connected inside the primary pin (301).

8. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, The test chamber (7) has a double-layer structure. The waste tire sample is placed in the inner test chamber (703). A combination structure of damper (701) and spring (702) is set in the steel box interlayer.

9. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, The inner side of the test chamber is made of steel plate, and reinforcing ribs are set at the four corners of the outer side of the test chamber.

10. The pendulum-type test loading device for simulating vehicle load according to claim 1, characterized in that, Multiple earth pressure cells are embedded in the test chamber (7). The burial depth and position are marked on the outside of the steel box. The earth pressure cells are connected to the control system (8). Earth pressure sensors (802) are installed in the earth pressure cells.

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