A periodic vibration testing device suitable for highway material specimens

Abstract

This invention relates to the field of road engineering testing equipment technology, specifically to a periodic vibration testing device suitable for highway material samples. The device includes a vibration device, a pressurizing device, a transmission device, and a detection device. The transmission device includes a transmission pipe filled with hydraulic oil. The vibration device drives the hydraulic oil in the transmission pipe to flow through a hydraulic mechanism to generate power. The vibration device drives a propeller to rotate through the flowing hydraulic oil, which in turn drives an eccentric wheel to rotate, applying periodic vibration to the sample. The detection device can use sensors to detect various data of the sample in real time during the experiment, and perform calculations and analysis through a host computer to obtain the specific performance parameters of the sample. This invention solves the deficiency of traditional universal testing machines in being unable to perform vibration testing, providing a widely applicable and low-cost experimental scheme for studying the performance of highway materials under periodic vibration.

Description

Technical Field

[0001] This invention relates to the field of road engineering testing equipment technology, specifically to a periodic vibration testing device suitable for highway material samples. Background Technology

[0002] In highway construction, the mechanical properties of the subgrade, base course, and surface course materials directly determine the service life and operational safety of the road. In actual use, highway materials are subjected to long-term traffic loads, especially the repetitive and periodic vibrations and impacts from heavy vehicles. This continuous dynamic load effect leads to the initiation and propagation of microcracks within the materials, subsequently causing fatigue damage, permanent deformation, and a series of other defects, ultimately accelerating the destruction of the road structure.

[0003] Traditional static load tests or simple dynamic loading devices cannot accurately reflect the long-term dynamic response of materials at specific frequencies, amplitudes, and waveforms. Currently, some existing devices suffer from problems such as limited functionality, low waveform control accuracy, limited load capacity, or inability to simulate complex stress states. Summary of the Invention

[0004] The purpose of this invention is to provide a periodic vibration testing device suitable for highway material samples that can accurately simulate the long-term service state of highway materials under actual traffic loads in a laboratory environment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A periodic vibration testing device suitable for highway material samples includes a transmission device, which includes a transmission pipe filled with hydraulic oil. The transmission pipe has an oil inlet and an oil outlet at its two ends. A pressure block is connected above the oil inlet via a piston structure. The oil outlet has a vertically downward opening, and an oil container is positioned below it. A necked section is provided in the middle of the transmission pipe, and a pressurizing device is positioned above the pressure block. A vibration device is connected to the necked section of the transmission pipe. The pressurizing device and the vibration device are each connected to a detection device via data cables. The detection device includes an electronic controller connected to the pressurizing device and the vibration device via data cables, and the electronic controller is connected to a host computer.

[0006] Preferably, the testing device includes a crescent-shaped outer shell disposed in the necked section of the transmission pipeline, with a propeller rotatably connected inside the crescent-shaped outer shell; an opening is provided at the position where the necked section mates with the crescent-shaped outer shell, through which the propeller extends into the necked section; a connecting rod is coaxially connected to the propeller, and an eccentric wheel is connected to the other end of the connecting rod; the eccentric wheel and the connecting rod are coaxially rotatably engaged, and a pressure plate is rotatably connected to the bottom end of the eccentric wheel via a transmission rod; a specimen base is disposed below the pressure plate, and a specimen fixing device is disposed on the specimen base.

[0007] Preferably, a cylindrical outer shell is fitted around the connecting rod, and a support rod is fixedly connected to the outer side of the cylindrical outer shell; the bottom end of the support rod is fixedly mounted on the integral base, and the integral base is fixedly mounted on the ground; the specimen base is fixedly mounted on the integral base; a bearing is provided inside the cylindrical outer shell, and the connecting rod rotates with the cylindrical outer shell through the bearing.

[0008] Preferably, the pressurizing device includes a bottom support fixedly installed on the ground, and a pressure block installed on top of the bottom support by a spring; a portal frame is fixedly installed on the bottom support, and a pressure block is installed below the crossbeam of the portal frame by a hydraulic mechanism; the pressure block is installed above the pressure block, and the hydraulic mechanism is connected to an electronic controller via a data cable.

[0009] Preferably, the transmission pipeline is equipped with valves at the oil inlet and oil outlet, and a regulating valve is installed between the oil inlet and the constricted section of the transmission pipeline.

[0010] Preferably, the eccentric wheel has multiple connecting holes along its long axis that mate with the connecting rod. The length of the line connecting the connecting hole and the central axis of the eccentric wheel is greater than zero and less than the radius of the long axis of the eccentric wheel.

[0011] Preferably, the transmission rod has an L-shaped structure, with the short side of the transmission rod set horizontally and the long side set vertically; a central hole is provided at the central shaft of the eccentric wheel, the short side of the transmission rod is rotatably connected to the central hole through a bearing, and the long side is fixedly connected to the pressure plate.

[0012] Preferably, the diameter of the constricted section of the transmission pipe is smaller than the diameter of the main body of the transmission pipe; a pair of coaxial shaft holes are provided in the middle of the crescent-shaped outer shell, and bearings are provided in both shaft holes; the propeller is coaxially fitted with the pair of shaft holes, and the shaft of the propeller passes through the pair of shaft holes via bearings and rotates with the crescent-shaped outer shell; a sealing rubber ring is provided at the shaft hole, and an end cap is provided at the shaft hole on the side opposite to the connecting rod.

[0013] Preferably, the pressure block includes a steel disc with its central axis vertically arranged; a cylindrical steel rod is coaxially arranged at the bottom of the steel disc and is fixedly connected to the steel disc; the oil inlet of the transmission pipeline has a vertically upward opening, and the bottom end of the cylindrical steel rod is inserted into the opening at the oil inlet; the end of the cylindrical steel rod is provided with a sealing rubber ring that matches the opening at the oil inlet.

[0014] Preferably, the electronic controller is connected to a sensor group via a data cable, and the sensor group is mounted on the specimen fixedly mounted on the top of the specimen chassis.

[0015] The beneficial effects of this invention are: This invention, through the use of a composite loading structure that combines a hydraulic transmission device, a pressurizing device, and a vibration device, can accurately simulate the periodic vibration, impact, and long-term static pressure of road materials under actual traffic loads, truly restoring the stress state of road materials during on-site service, and overcoming the defects of traditional static load tests and simulations using simple power equipment.

[0016] This invention, by setting up a hydraulic transmission pipeline with a necked section, an adjustable valve, and an electronically controlled detection device, can precisely regulate the hydraulic flow, pressure, vibration frequency, and waveform parameters, thereby improving the loading control accuracy and solving the problems of poor waveform control and inaccurate parameter adjustment in existing equipment.

[0017] This invention significantly improves the load-bearing capacity and loading capacity of the equipment by setting up a hydraulic oil power transmission, pressure block pressurization and overall base fixed support structure. It is suitable for various specifications and strengths of highway material samples such as roadbed, base layer and surface layer, and has a wider range of applications.

[0018] This invention, by setting up a linkage mechanism of crescent-shaped shell, propeller, eccentric wheel and L-shaped transmission rod, and arranging multiple sets of connecting holes on the eccentric wheel, can flexibly adjust the vibration amplitude and force form, realize the simulation of complex stress state, and meet the needs of multi-condition test. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the connection between the pressurizing device and the transmission device of the present invention; Figure 3 This is a partially enlarged view from the back of the connection between the transmission device and the vibration device of the present invention; Figure 4 This is a partially enlarged view from the front of the connection between the transmission device and the vibration device of the present invention. Figure 5 This is a cross-sectional schematic diagram of the internal structure at the connection between the transmission device and the vibration device of the present invention.

[0020] In the diagram: 1. Pressurizing device; 2. Transmission device; 3. Vibration device; 4. Detection device; 5. Host computer; 6. Electronic controller; 7. Support rod; 8. Eccentric wheel; 9. Transmission rod; 10. Pressure plate; 11. Specimen chassis; 12. Integral base; 13. Transmission pipeline; 14. Valve; 15. Propeller; 16. Oil container; 17. Bottom support; 18. Hydraulic mechanism; 19. Pressure block; 20. Crescent-shaped outer shell; 21. Oil inlet; 22. Support frame; 23. Data cable; 24. Spring; 25. Pressure block; 26. Neck section; 27. Cylindrical outer shell; 28. Connecting rod; 29. ​​Adjusting valve; 30. Steel disc; 31. Cylindrical steel rod; 32. Hydraulic oil. Detailed Implementation

[0021] The following is a further explanation of the present invention in conjunction with specific embodiments, such as... Figure 1 As shown, this embodiment is a periodic vibration testing device suitable for highway material samples, which mainly includes four parts: a pressurizing device 1, a transmission device 2, a vibration device 3, and a testing device 4. The pressurizing device 1 is used to cooperate with the transmission device 2 to generate driving force, drive the vibration device 3 to perform various actions on the specimen for testing, and the test results are detected and recorded by the testing device 4.

[0022] The pressurizing device 1 includes a bottom support 17, which is fixed to the ground by high-strength screws; a portal frame is provided on the top of the bottom support 17, and a hydraulic mechanism 18 is provided below the crossbeam of the portal frame; a pressure block 19 is connected to the bottom of the hydraulic mechanism 18, and the hydraulic mechanism 18 can push the pressure block 19 to move up and down; to adapt to equipment in general laboratories, the pressurizing device 1 can also be replaced by an existing universal testing machine, which can also provide the power to push the pressure block 19 downward.

[0023] The transmission device 2 includes a transmission pipe 13 filled with hydraulic oil 32. One end of the transmission pipe 13 is set as an oil inlet 21, and the other end is set as an oil outlet. A valve 14 is provided at the oil inlet 21, which can control the opening and closing state of the oil inlet 21. A valve 14 is also provided at the oil outlet to control the opening and closing state of the oil outlet. The opening of the oil outlet is set downward, and an oil container 16 is provided below the oil outlet to collect the hydraulic oil 32 flowing out of the transmission pipe 13.

[0024] like Figure 2 As shown, a piston-shaped structure is provided at the oil inlet 21 of the transmission pipeline 13, including an upward-facing opening; a pressure-bearing block 25 is provided at this opening, the pressure-bearing block 25 including a steel disc 30, the steel disc 30 being positioned directly below the pressure-applying block 19; a cylindrical steel rod 31 is coaxially fixed below the steel disc 30; the bottom end of the cylindrical steel rod 31 is inserted into the opening at the oil inlet 21 of the transmission pipeline 13, and a sealing rubber ring is provided at the end of the cylindrical steel rod 31 to prevent hydraulic oil 32 from leaking from the opening; the cylindrical steel rod 31 and the opening... The opening forms a piston-like structure. When the steel disc 30 moves downward under the action of the pressure block 19, it pushes the hydraulic oil 32 at the opening, causing it to be squeezed and move from the oil inlet 21 end of the transmission pipe 13 to the oil outlet end. A spring 24 is also provided below the steel disc 30. The bottom end of the spring 24 is fixedly connected to the bottom support 17. When the steel disc 30 is pressed downward, the spring 24 will be compressed and store potential energy. When the hydraulic mechanism 18 lifts the pressure block 19 upward, it will release the potential energy simultaneously to push the steel disc 30 back to its original height for the next pressurization.

[0025] The vibration device 3 includes an integral base 12, which is fixed to the ground by high-strength screws. A specimen base 11 is fixedly mounted on the integral base 12, and a fixing device is provided on the specimen base 11 to fix the specimen and prevent it from shifting or falling off during the test. Figure 3 and Figure 4 As shown, a support rod 7 is also fixedly installed on the overall base 12. The support rod 7 has an inverted L-shaped structure, and a cylindrical outer shell 27 is fixedly connected to its top end; as shown Figure 5 As shown, the cylindrical outer shell 27 is a hollow structure, and a connecting rod 28 is fitted inside it; multiple bearings are coaxially arranged inside the cylindrical outer shell 27, and the internal gaps are filled with lubricating oil, which can reduce the friction of the connecting rod 28 during rotation and improve the transmission efficiency.

[0026] One end of the connecting rod 28 is coaxially fixedly connected to a propeller 15, and the other end is fixedly connected to an eccentric wheel 8. The central axis of the connecting rod 28 is parallel to and not collinear with the central axis of the eccentric wheel. Multiple connecting holes are provided along the long axis of the eccentric wheel 8, and each connecting hole does not coincide with the central axis of the eccentric wheel 8. The connecting rod 28 can be fixedly connected to the eccentric wheel 8 through any one of the multiple connecting holes, so that the axial distance of the eccentric wheel 8 is different when it rotates with the connecting rod 28, thus causing the eccentric wheel 8 to produce different swing amplitudes. A through hole is provided at the central shaft of wheel 8, and a bearing is installed in the through hole; an L-shaped transmission rod 9 is rotatably connected to the eccentric wheel 8 through the bearing, with its long side set vertically and its short side set horizontally and connected to the bearing; a pressure plate 10 is fixedly connected to the bottom of the long side of the transmission rod 9, and the position of the pressure plate 10 is directly above the specimen base 11. When the eccentric wheel 8 starts to rotate around the connecting rod 28, it can drive the pressure plate 10 to move up and down and vibrate the specimen below. The vibration intensity can be changed by switching different connecting holes.

[0027] A necked section 26 is provided in the middle of the transmission pipe 13. The diameter of the necked section 26 is much smaller than the diameter of the rest of the main body. A crescent-shaped shell 20 is provided at the necked section 26. The interior of the crescent-shaped shell 20 is hollow, and two coaxial through holes are opened on its two sides. Bearings are installed in both through holes, and propellers 15 are installed through the bearings and passing through the two through holes. One end of the propeller 15 is coaxially fixedly connected to the connecting rod 28, so that it can drive the connecting rod 28 to rotate. An end cap is provided at the through hole on the other side of the crescent-shaped shell 20 opposite to the connecting rod 28 to prevent leakage of internal hydraulic oil 32. A sealing rubber ring is also provided at the bearing to prevent hydraulic oil 32 from leaking into the cylindrical outer shell 27; an opening is provided at the necked section 26, through which the propeller 15 can extend into the transmission pipe 13; when the hydraulic oil 32 in the transmission pipe 13 begins to flow under the action of the pressurizing device 1, it will drive the propeller 15 to rotate, thereby driving the connecting rod 28 to rotate synchronously, thus driving the vibration device 3; a regulating valve 29 is provided between the necked section 26 and the oil inlet 21 on the transmission pipe 13, which can be used to regulate the flow rate of the hydraulic oil 32, thereby controlling the vibration frequency of the vibration device 3.

[0028] The testing device 4 includes an integral base 12, on which a host computer 5 and an electronic controller 6 are fixedly mounted. The electronic controller 6 has real-time control and real-time detection capabilities, and is connected to the hydraulic mechanism 18 and the sensor group via data cable 23. The electronic controller 6 can transmit start and stop signals to the hydraulic mechanism 18, while the sensor group includes various sensors that can be installed on the test piece to collect various data such as the state of the test piece during the test. The specific operation of the electronic controller 6 is controlled by the host computer 5, and the various signal data received by it are also fed back to the host computer 5 for summarization and analysis.

[0029] In practical use, this embodiment first opens valve 14 at oil inlet 21 to inject sufficient hydraulic oil 32 into transmission pipeline 13; then closes valve 14 at oil inlet 21 and opens regulating valve 29 and valve 14 at oil outlet to begin the experiment; the sample is fixedly placed on the specimen base 11, and various sensors are set on the specimen; the upper computer 5 controls the hydraulic mechanism 18 in the pressurizing device 1 to apply pressure to the pressure block 25, thereby pushing the hydraulic oil 32 in transmission pipeline 13 to flow towards the oil outlet under pressure; when the hydraulic oil 32 passes through the necking section 26, the inner diameter of transmission pipeline 13 is greatly reduced, causing the flow rate of hydraulic oil 32 to increase significantly. The propeller 15 is rapidly rotated, which in turn drives the pressure plate 10 to reciprocate rapidly, repeatedly impacting and vibrating the sample below. The vibration intensity can be adjusted by adjusting the shaft distance of the eccentric wheel 8, while the vibration frequency can be adjusted by changing the flow rate of the hydraulic oil 32 by adjusting the regulating valve 29. During the experiment, various data of the sample can be acquired by sensors and imported into the electronic controller 6 and the host computer 5 via the data line 23 for specific analysis, including the original physical quantities of the sample such as force, deformation, and acceleration. Finally, the host computer 5 analyzes and transforms these data into key indicators of the core performance of the highway material, such as dynamic stiffness, damping characteristics, fatigue resistance, and permanent deformation.

[0030] The above description is merely a further explanation of the present invention in conjunction with specific embodiments. All descriptions made do not imply any limitation on the scope of protection of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A periodic vibration testing device suitable for highway material specimens, comprising a transmission device, characterized in that: The transmission device includes a transmission pipe filled with hydraulic oil; the two ends of the transmission pipe are an oil inlet and an oil outlet, respectively; a pressure block is connected above the oil inlet via a piston structure; the oil outlet has a vertically downward opening, and an oil container is located below the oil outlet; a necking section is provided in the middle of the transmission pipe; a pressurizing device is located above the pressure block; and a vibration device is connected to the necking section of the transmission pipe; the pressurizing device and the vibration device are respectively connected to a detection device via data cables; the detection device includes an electronic controller connected to the pressurizing device and the vibration device via data cables, and the electronic controller is connected to a host computer.

2. The periodic vibration testing device for highway material specimens according to claim 1, characterized in that: The testing device includes a crescent-shaped outer shell disposed in the constricted section of the transmission pipeline, with a propeller rotatably connected inside the crescent-shaped outer shell; an opening is provided at the position where the constricted section mates with the crescent-shaped outer shell, through which the propeller extends into the constricted section; a connecting rod is coaxially connected to the propeller, and an eccentric wheel is connected to the other end of the connecting rod; the eccentric wheel is rotatably engaged with the connecting rod, and a pressure plate is rotatably connected to the bottom end of the eccentric wheel via a transmission rod; a specimen base is disposed below the pressure plate, and a specimen fixing device is disposed on the specimen base.

3. The periodic vibration testing device for highway material specimens according to claim 2, characterized in that: The connecting rod is fitted with a cylindrical outer shell, and a support rod is fixedly connected to the outer side of the cylindrical outer shell; the bottom end of the support rod is fixedly mounted on the integral base, and the integral base is fixedly mounted on the ground; the specimen base is fixedly mounted on the integral base; a bearing is provided inside the cylindrical outer shell, and the connecting rod rotates with the cylindrical outer shell through the bearing.

4. The periodic vibration testing device for highway material specimens according to claim 1, characterized in that: The pressurizing device includes a bottom support fixedly installed on the ground, and a pressure block is set on top of the bottom support by a spring; a portal frame is fixedly installed on the bottom support, and a pressure block is set below the crossbeam of the portal frame by a hydraulic mechanism; the pressure block is set above the pressure block, and the hydraulic mechanism is connected to an electronic controller via a data cable.

5. The periodic vibration testing device for highway material specimens according to claim 1, characterized in that: The transmission pipeline is equipped with valves at the oil inlet and oil outlet, and a regulating valve is installed between the oil inlet and the constricted section of the transmission pipeline.

6. The periodic vibration testing device for highway material specimens according to claim 2, characterized in that: The eccentric wheel has multiple connecting holes along its long axis that mate with the connecting rod. The length of the line connecting the connecting hole and the central axis of the eccentric wheel is greater than zero and less than the radius of the long axis of the eccentric wheel.

7. The periodic vibration testing apparatus for highway material specimens according to claim 6, characterized in that: The transmission rod has an L-shaped structure, with its short side horizontal and its long side vertical. A central hole is provided at the central shaft of the eccentric wheel. The short side of the transmission rod is rotatably connected to the central hole through a bearing, and the long side is fixedly connected to the pressure plate.

8. The periodic vibration testing device for highway material specimens according to claim 1, characterized in that: The diameter of the constricted section of the transmission pipe is smaller than the diameter of the main body of the transmission pipe; a pair of coaxial pivot holes are provided in the middle of the crescent-shaped outer shell, and a bearing is provided in each of the pivot holes; the propeller is coaxially fitted with the pair of pivot holes, and the propeller shaft passes through the pair of pivot holes via bearings and rotates with the crescent-shaped outer shell; a sealing rubber ring is provided at the pivot hole, and an end cap is provided at the pivot hole on the side opposite to the connecting rod.

9. The periodic vibration testing apparatus for highway material specimens according to claim 1, characterized in that: The pressure-bearing block includes a steel disc with its central axis vertically positioned. A cylindrical steel rod is coaxially positioned at the bottom of the steel disc and is fixedly connected to the steel disc. The oil inlet of the transmission pipeline has a vertically upward opening, and the bottom end of the cylindrical steel rod is inserted into the opening at the oil inlet. A sealing rubber ring that mates with the opening at the oil inlet is provided at the end of the cylindrical steel rod.

10. The periodic vibration testing apparatus for highway material specimens according to claim 1, characterized in that: The electronic controller is connected to a sensor group via a data cable, and the sensor group is mounted on the specimen fixedly mounted on the top of the specimen chassis.

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