A test device for simulating a mechanical stress environment of a vehicle

Abstract

A testing device simulating the mechanical stress environment of vehicle crushing includes a rectangular frame with linear bearings fixed to the inner sides of the four corners at the top. A wheel frame is mounted on the upper part of the frame and can move vertically via the linear bearings. The wheel is mounted on the wheel frame via an axle and a bearing seat and can rotate in the vertical plane. A counterweight is mounted on the wheel. A cylinder and a linear guide rail are located on the base plate of the frame. A sample mounting plate is connected to the end of the cylinder piston rod and is equipped with a control device. The sample mounting plate is slidably connected to the linear guide rail and is located directly below the wheel, bearing the crushed sample. The cylinder control device includes a PLC controller, a counter, a solenoid valve, a magnetic switch, and a one-way throttle valve. By using a cylinder to drive the sample end to move while the counterweight remains stationary, a small amount of air driving force can be used to simulate the mechanical stress conditions of repeated vehicle crushing. The precise control parameters meet the laboratory's testing needs for different mechanical stress environments of the test sample.

Description

Technical Field

[0001] This utility model relates to the field of mechanical structure testing technology, and in particular to a testing device that simulates the mechanical stress environment of vehicle rolling. Background Technology

[0002] In the current new intelligent parking system, new sensor strips / belts are laid on the ground of the parking space as data acquisition terminals. They are used to sense the speed of parked vehicles, the start and end time of parking, and the final parking position. The information is fed back to the intelligent central controller in real time for traffic scheduling and overall management, such as the occupancy status of multiple parking spaces in the parking lot.

[0003] In the actual use environment of intelligent parking systems, sensors laid on parking spaces and other fixed facilities or temporary movable small parts and products that may be subjected to vehicle traffic must be able to withstand the repeated rolling of heavy vehicles' wheels. Therefore, it is necessary to conduct structural and functional verification and reliability and durability tests on impact resistance, wear resistance and other mechanical stress environments to ensure that the products have structural and material integrity and safety, as well as functional and performance integrity and stability throughout their service life.

[0004] Existing testing devices use a method where a driving weight (simulating a vehicle) is used to fix the product in place. Considering that the load limit of an actual vehicle generally requires a driving force of several hundred kilograms or even tons to move the counterweight of the testing device, existing equipment generally only simulates the test conditions of a single or several crushing cycles. This cannot meet the test conditions of repeated crushing by extreme counterweight vehicles, which are required for product durability verification tests, such as thousands or even tens of thousands of cycles.

[0005] Moreover, the existing testing equipment has stringent requirements for laboratory foundations and other facilities, as well as for the safety of users during the initial installation. Furthermore, the equipment suffers severe wear and tear over long-term use. It also has drawbacks such as large size, immobile main body, high inertia after startup, high configuration requirements for drive and braking ends, unadjustable upper limit of counterweight dependent on drive force, and high daily maintenance and repair costs.

[0006] Because different vehicle types have different weights and load capacities when entering and exiting the vehicle in reality, and their driving speeds are also uncontrollable, in order to verify the tolerance and durability of the crushed product under extreme mechanical stress environment, a test device for mechanical environment reliability that can be used in the laboratory is designed. This places higher demands on the drive method, smaller driving force, installation method of the crushed sample, convenience of load configuration and flexible adjustment of weight range, adjustable crushing speed, stability of counterweight and flexibility of wheel rotation and movement, safety assurance of equipment use and maintenance / repair costs, and cost of the equipment itself. Summary of the Invention

[0007] This invention proposes a testing device for simulating the mechanical stress environment of vehicle crushing. It uses a cylinder to drive the sample end to move while the counterweight end remains stationary. It can achieve the mechanical stress conditions of repeated vehicle crushing in the laboratory with a small amount of air driving force. The precise control parameters meet the laboratory's testing needs for different mechanical stress environments of the test sample.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: A testing device simulating the mechanical stress environment of vehicle crushing includes a frame, wheel frame, wheel, axle, cylinder, linear guide rail, and cylinder control device. The frame is a rectangular frame, with four linear bearings fixed to the inner sides of the four corners at the upper end of the frame. The wheel frame includes four uprights, four connecting rods, and two support rods. The four uprights and linear bearings are vertically connected. Adjacent uprights are fixedly connected by support rods, which are connected to the lower ends of the uprights. The left and right ends of the axle are fixed to the upper ends of the two support rods. The wheel is fitted onto the axle, and a counterweight is installed on the wheel. The cylinder and linear guide rail are located on the base plate of the frame. The cylinder is a double-acting cylinder with two one-way throttle valves corresponding to the two chambers. The piston rod end of the cylinder is connected to a horizontally arranged sample mounting plate, which is slidably connected to a linear guide rail. The sample mounting plate is located directly below the wheel and bears the sample being crushed. The cylinder control device includes a PLC controller, a counter, a solenoid valve, two magnetic switches, and two one-way throttle valves. The two magnetic switches are respectively connected to electromagnets on both sides of the solenoid valve. One magnetic switch is fixed at the starting position at both ends of the cylinder, and the other magnetic switch slides and adjusts along the stroke of the cylinder. The counter is connected to the two magnetic switches and the electromagnets on both sides of the solenoid valve.

[0009] Furthermore, a magnetic switch is provided on the inner side of each of the two one-way throttle valves, and both the one-way throttle valves and the magnetic switches are controlled by solenoid valves.

[0010] Furthermore, the testing device also includes a counter, which is electrically connected to two magnetic switches.

[0011] Furthermore, the left and right ends of the axle are fixedly connected to the support rod via bearings with mounting brackets.

[0012] Furthermore, the cylinder and linear guide are fixed on the cylinder mounting plate, and the cylinder mounting plate is movably connected to the base plate of the frame through rollers and feet.

[0013] Furthermore, casters are provided at the four corners of the bottom surface of the frame.

[0014] This invention uses a wheel frame, wheels, and counterweights to simulate the weight of a vehicle. A cylinder drives a mounting plate containing the sample in a cyclical motion, simulating the sample being crushed by wheels of different weights and speeds. Adjusting the counterweights can simulate the weight of different vehicles. Adjusting the one-way throttle valve on the cylinder can regulate the speed of the cylinder piston rod, simulating different driving speeds of the test vehicle. Adjusting the position of the sliding magnetic switch can regulate the start and end positions and stroke steps of the piston in the cylinder, thereby accurately locating the part and length of the sample crushed by the wheels. A counter and a PLC programmable controller can simulate the number of times the wheels repeatedly crush the test sample.

[0015] This invention employs a cylinder-driven sample end movement while the counterweight end remains stationary. A small amount of air force is sufficient to simulate the mechanical stress test of a vehicle crushing the sample in the laboratory. Because the moving component is the lightweight crushed sample while the counterweight remains stationary, the requirements for the main equipment's drive and braking systems are low. The system is easy to install in the laboratory, requires little floor space, and experiences minimal wear and tear on the equipment itself. It also has relatively low requirements for stability and protective measures. Advantages include adjustable (removable and replaceable) counterweight, adjustable travel speed, good equipment safety and mobility, low maintenance and repair costs, low equipment cost, and a more realistic mechanical stress environment.

[0016] This utility model has a simple and practical overall structure, is easy to operate, and meets the laboratory's testing needs for the mechanical stress environment of test samples. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cylinder control device of this utility model.

[0018] Figure label: 1 rack, 2. Wheel frame, 201. Upright pole, 202. Connecting rod, 203. Support rod. 3. Linear bearings, 4. Wheels, 5. Axles, 6. Mounted bearings, 7. Cylinder mounting plates. 8 cylinders, 9 sample mounting plate, 10 linear guide rail, 11 casters. 12 One-way throttle valve, 1201 First one-way throttle valve, 1202 Second one-way throttle valve, 13 Solenoid valve, 14 Counter, 15 Magnetic switch, 1501 First magnetic switch, 1502 Second magnetic switch. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] This embodiment proposes a testing device to simulate the mechanical stress environment of vehicle rolling, such as... Figure 1 As shown, it includes a frame 1, a wheel frame 2, wheels 4, axles 5, cylinders 8 and linear guide rails 10. The frame 1 is a rectangular frame. Casters 11 are provided at the four corners of the bottom surface of the frame 1. Four linear bearings 3 are fixedly installed on the inner sides of the four corners of the upper end of the frame 1.

[0021] like Figure 1 As shown, the wheel frame 2 includes four uprights 201, four connecting rods 202, and two support rods 203. The four uprights 201 and the linear bearing 3 are vertically connected. Two adjacent uprights 201 are fixedly connected by the support rods 203. The support rods 203 are connected to the lower end of the uprights 201. The left and right ends of the axle 5 are fixed to the upper ends of the two support rods 203. Preferably, the left and right ends of the axle 5 are fixedly connected to the support rods 203 by bearings 6 with seats. The wheel 4 is fitted on the axle 5, and a counterweight is installed on the wheel 4.

[0022] The cylinder 8 is equipped with two one-way throttle valves 1201 and 1202 corresponding to the two chambers. The cylinder 8 and the linear guide rail 10 are located on the base plate of the frame 1. Preferably, the cylinder 8 and the linear guide rail 10 are fixed on the cylinder mounting plate 7. The cylinder mounting plate 7 is movably connected to the base plate of the frame 1 through rollers and feet.

[0023] The piston rod end of cylinder 8 is connected to a horizontally set sample mounting plate 9. The sample mounting plate 9 is slidably connected to the linear guide rail 10. The sample mounting plate 9 is located directly below the wheel 4 and carries the sample to be crushed. The speed of the piston rod of cylinder 8 can be adjusted by adjusting the one-way throttle valve 12 to simulate different driving speeds. In actual use, the sample mounting plate 9 can be used to install samples that need to be subjected to vehicle crush stress tests, such as sensor strips / belts laid in parking spaces, or other ground paving facilities that may be crushed by vehicles, or temporary movable small products.

[0024] The device in this embodiment also includes a cylinder control device, which connects to and controls the cylinder 8. The cylinder control device includes a PLC controller (not shown in the figure), a counter 14, a solenoid valve 13, a magnetic switch 15, and a throttle valve 12. The solenoid valve 13 is a dual-electrically controlled two-position five-way solenoid valve, which precisely controls the movement speed (cycle), stroke length, and start and end positions of the piston of the cylinder 8, and completes the reciprocating motion of the sample mounting plate 9 driven by the cylinder and counts the number of times.

[0025] A magnetic switch 15 is provided on the inner side of each of the two one-way throttle valves 12. Both the one-way throttle valves 12 and the magnetic switches 15 are controlled by the solenoid valve 13. The counter 14 is electrically connected to the two magnetic switches 15.

[0026] Before testing, the sample to be tested is installed on the sample mounting plate 9. Then, according to the weight of the simulated vehicle, a matching counterweight is installed on the wheel 4 to press the wheel 4 onto the sample. Then, according to the simulated driving speed of the wheel 4, the two one-way throttle valves on the cylinder 8 are adjusted to regulate the air pressure and thus control the speed of the piston rod of the cylinder 8. The cylinder 8 needs to be tested and adjusted here. A float-type barometer or other gas pressure indicator can be installed and adjusted according to the movement speed of the piston rod before measurement and marking.

[0027] The first magnetic switch 1501 is fixed in place. The position of the second magnetic switch 1502 is adjusted according to the length of the crushed part of the sample to be tested, thereby adjusting the start and end positions and stroke steps of the piston of cylinder 8 (cylinder 8 needs to be tested and adjusted here). The counter 14 and PLC controller are set according to the test requirements to complete the corresponding number of crushing times. One round trip of the piston of cylinder 8 is equivalent to the wheel crushing twice.

[0028] During testing, the control cylinder 8 is activated, and the piston rod of the cylinder 8 drives the sample mounting plate 9 and the sample to be tested on it to reciprocate along the linear guide rail 10. Under the combined gravity of the wheel frame 2, the wheel 4 and the counterweight, the effect of repeated crushing of a vehicle is simulated, thereby realizing the detection and verification of the sample's structural reliability, material durability and service life.

[0029] Given that this embodiment uses a physical wheel structure, the vehicle counterweight, wheel brand and model can be flexibly changed. It can be used in the laboratory to simulate the repeated application of vehicle crush stress to the sample for the sample's endurance verification test. It can also be used as an auxiliary device for measuring the pressure distribution of automobile tires and collecting spectral data. By changing the tires and counterweight loads of different models and tire pressure conditions in the device, and combining them with a high-density sensing pad (placed on the sample mounting plate 9), the total contact area and pressure distribution of the tire bead can be measured and recorded in real time and dynamically. Therefore, the measurement of pressure distribution contours and calibration values ​​under different tire models, different vehicle counterweights and different tire pressure conditions can be completed in the limited indoor environment of the laboratory.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A test apparatus for simulating a vehicle rolling mechanical stress environment, characterized by, The system includes a frame (1), a wheel frame (2), wheels (4), axles (5), cylinders (8), linear guides (10), and a cylinder control device. The frame (1) is a rectangular frame. Four linear bearings (3) are fixedly installed on the inner sides of the four corners of the upper end of the frame (1). The wheel frame (2) includes four uprights (201), four connecting rods (202), and two support rods (203). The four uprights (201) and the linear bearings (3) are vertically connected. Two adjacent uprights (201) are fixedly connected by support rods (203). The support rods (203) are connected to the lower end of the uprights (201). The left and right ends of the axle (5) are fixed to the upper ends of the two support rods (203). The wheels (4) are fitted onto the axles (5). Counterweights are installed on the wheels (4). The cylinders (8) and linear guides (10) are located on the frame (1). On the base plate of the cylinder (8), the cylinder (8) is provided with two one-way throttle valves corresponding to the two chambers. The piston rod end of the cylinder (8) is connected to a horizontally set sample mounting plate (9). The sample mounting plate (9) is slidably connected to the linear guide rail (10). The sample mounting plate (9) is located directly below the wheel (4) and carries the crushed sample. The cylinder control device includes a PLC controller, a counter (14), a solenoid valve (13), two magnetic switches (15) and two one-way throttle valves (12). The two magnetic switches (15) are respectively connected to the electromagnets on both sides of the solenoid valve (13). One of the magnetic switches (15) is fixed at the starting position at both ends of the cylinder (8), and the other magnetic switch (15) is slidably adjusted along the stroke of the cylinder (8). The counter (14) is respectively connected to the two magnetic switches (15) and the electromagnets on both sides of the solenoid valve (13).

2. The test apparatus for simulating a stress environment of a vehicle compactor as claimed in claim 1, wherein, A magnetic switch (15) is provided on the inner side of each of the two one-way throttle valves (12), and both the one-way throttle valves (12) and the magnetic switch (15) are controlled by a solenoid valve (13).

3. The test apparatus for simulating a vehicle compactor stress environment of claim 2, wherein, The testing device also includes a counter (14), which is electrically connected to two magnetic switches (15).

4. The test apparatus for simulating a vehicle compaction machinery stress environment of claim 1, wherein, The left and right ends of the axle (5) are fixedly connected to the support rod (203) by bearings (6).

5. The test apparatus simulating the stress environment of a vehicle-rolling machine according to claim 1, wherein, The cylinder (8) and the linear guide (10) are fixed on the cylinder mounting plate (7), which is movably connected to the base plate of the frame (1) via rollers and feet.

6. The test apparatus simulating the stress environment of a vehicle compactor of claim 1 wherein, The frame (1) has casters (11) at the four corners of its bottom surface.

Images