Low-frequency vibration test bench for vehicle detection equipment

Abstract

The utility model relates to the technical field of test equipment for vehicle detection equipment, in particular to a low-frequency vibration test bench for vehicle detection equipment, which comprises a test bench frame, a linear module is arranged on the test bench frame, a moving sliding table is arranged on the linear module, the moving sliding table is in sliding fit with the linear module, and the moving sliding table is connected with the linear module. A mounting platform is arranged on the moving sliding table, a detection sensor is arranged on the mounting platform, and the linear module is connected with a driving device. The utility model has the advantages that the device can be effectively applied to the precision test and calibration detection of the low-frequency (0.5-10) Hz response capability of a portable motor train unit stability inspection tester or other vibration detection systems, and can be used as auxiliary corollary equipment for the development of a vibration detection instrument or a system in cooperation with the use of an intermediate-frequency vibration table above 10Hz; the system has good functions in the aspects of usability, universality, applicability and the like, and can provide related technical support for carrying out vibration test and diagnosis technology research and development of a motor train unit or other specialties.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle inspection equipment test equipment, in particular to a low-frequency vibration test bench for vehicle inspection equipment. Background Art

[0002] The shaking and trembling of EMUs are currently a problem of great concern to the National Railway Group and the vehicle operation and maintenance management departments of the group company. Scientific testing methods and supporting testing equipment are urgently needed to solve the problem of quantitative analysis and evaluation of the running stability of EMUs. According to the requirements of the group company's scientific research plan project "Development of a portable EMU stability tester" (task number: 2022198), a portable EMU stability tester has been developed, which can provide important means and basis for the EMU operation and maintenance management department to find the cause of EMU shaking and judge the running quality of EMUs.

[0003] In order to optimize and improve the design and manufacturing quality of the inspection instrument, fully ensure the accuracy of the instrument, and build a complete market promotion and application system, the existing general-purpose vibration laboratory test platform (measurable frequency ≥ 10Hz) of the vehicle inspection laboratory cannot fully meet the test, calibration or detection requirements of the frequency response range (0.5-40 Hz) of the portable EMU stability inspection instrument due to the constraints of the excitation principle, and the calibration equipment suitable for low-frequency vibration sensors on the market is complex in structure and expensive. Therefore, it is proposed to develop a low-frequency vibration laboratory test platform (measurable frequency 0.5-10 Hz) to make up for the shortcomings of the existing general-purpose vibration laboratory test platform in low-frequency testing, calibration or detection, so as to enhance the research and development and testing capabilities of the vehicle inspection technology laboratory in the field of vibration detection and monitoring. Summary of the invention

[0004] The purpose of the utility model is to provide a low-frequency vibration test bench for vehicle detection equipment in accordance with the above-mentioned deficiencies of the prior art. After the upper computer communicates with the PLC controller to input the running program and set the running parameters, the PLC controller sends a motion control instruction to control the output of the servo driver, and then the servo driver sends a motor motion instruction to the servo motor, and the servo motor operates according to the set speed and torque; the servo motor and the reducer drive the motion slide to make reciprocating linear motion at a certain frequency and amplitude through a high-precision linear module to simulate the low-frequency vibration (simple harmonic motion) during the operation of the vehicle; the vibration signal is synchronously collected by the calibration sensor and compared with the data measured by the instrument under test, and the low-frequency response performance of the sensor or instrument under test is detected and analyzed accordingly; at the same time, the motion position of the motion slide measured by the grating ruler is compared and analyzed with the slide position converted from the motor position control parameter to detect and ensure the operation stability of this debugging platform.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A low-frequency vibration test bench for vehicle inspection equipment, characterized in that it includes a test bench, a linear module is arranged on the test bench, a moving slide is arranged on the linear module, a sliding fit is formed between the moving slide and the linear module, a mounting platform is arranged on the moving slide, a detection sensor is arranged on the mounting platform, and the linear module is connected to a driving device.

[0007] The driving device includes a servo motor and a reducer, wherein the servo motor drives the linear module through the reducer, and the servo motor is connected and controlled by a servo driver.

[0008] The servo driver is connected to the host computer through a PLC controller.

[0009] The vibration signal of the detection sensor is connected to the host computer through the detection data acquisition system.

[0010] An origin switch and a limit switch are arranged on the linear module.

[0011] A grating ruler is arranged on one side of the linear module.

[0012] An operation control box is arranged on one side of the test bench.

[0013] The test bench is also provided with an auxiliary electrical module.

[0014] The advantages of the utility model are: it can be effectively used in the accuracy test and calibration test of the low-frequency (0.5-10) Hz response capability of the portable EMU stability checker or other vibration detection systems, and can be used as an auxiliary supporting equipment for the development of vibration detection instruments or systems in conjunction with the use of a medium-frequency vibration table above 10 Hz; it has good functional performance in terms of usability, versatility and applicability, and can provide relevant technical support for the research and development of vibration testing and diagnosis technologies for EMUs or other professions; it can be promoted and applied to relevant vehicle departments, including EMU sections, locomotive and vehicle sections, locomotive and vehicle companies, etc. At the same time, the use of this debugging platform can lay the foundation for establishing the testing, calibration or detection standards of the group company's vehicle vibration detection and monitoring sensors and related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a system framework design diagram in the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0018] like Figure 1-2 As shown, the marks 1-15 in the figure respectively represent: test bench 1, host computer 2, linear module 3, installation platform 4, object to be tested 5, detection sensor 6, motion slide 7, drive device 8, grating ruler 9, electric control cabinet 10, operation control box 11, auxiliary electrical module 12, detection data acquisition device 13, PLC controller 14, servo drive 15.

[0019] Example: Figure 1 and Figure 2 As shown, the low-frequency vibration test bench for vehicle detection equipment in this embodiment is used to implement a low-frequency vibration test of the vehicle detection equipment, wherein the vehicle detection equipment is the object under test 5.

[0020] like Figure 1 As shown, the test bench in this embodiment includes two parts: an electric control cabinet 10 and a test bench 1. The electric control cabinet 10 is mainly used to place various types of electric control equipment used in the test bench, while the top of the test bench 1 is mainly used to carry a vibration system that simulates low-frequency vibrations during vehicle operation.

[0021] Specifically, the test bench 1 is provided with a linear module 3, and a moving slide 7 is provided on the linear module 3. The moving slide 7 and the linear module 3 form a sliding fit, so that the moving slide 7 can reciprocate along the linear module 3. A mounting platform 4 is provided on the moving slide 7, and a detection sensor 6 and a sensor or instrument to be tested as a measured object 5 are installed on the mounting platform 4.

[0022] In this embodiment, if Figure 1 As shown, a driving device 8 is provided at one end of the linear module 3, and the driving device 8 is composed of a servo motor and a reducer, wherein the servo motor is connected to the linear module 3 through the reducer to form a transmission fit, so that the linear module 3 can drive the moving slide 7 and the mounting platform 4 above it, the object to be measured 5 and the detection sensor 6 to move synchronously.

[0023] like Figure 1 As shown, the servo motor of the driving device 8 is connected and controlled by a servo driver 15, and the servo driver 15 is connected to the host computer 2 through a PLC controller 14. At the same time, the vibration signal of the detection sensor 6 is connected to the host computer 2 through a detection data acquisition device 13.

[0024] like Figure 2 As shown, an origin switch and a limit switch may be additionally provided on the linear module 3 to limit and control the displacement of the moving slide 7 .

[0025] like Figure 1As shown, a grating ruler 9 is provided on one side of the linear module 3, and the grating ruler 9 is used to measure the moving position of the moving slide 7, so as to further compare and analyze the position of the moving slide 7 obtained by converting the position control parameters of the servo motor, thereby improving the test accuracy.

[0026] like Figure 1 As shown, an operation control box 11 is provided on one side of the test bench 1 for controlling various electronic control devices.

[0027] like Figure 1 As shown, an auxiliary electrical module 12 is also provided in the electric control cabinet 10. The auxiliary electrical module 12 is provided with safety measures such as overload protection, over-temperature protection, and over-current protection to ensure that the equipment can automatically shut down under abnormal circumstances to protect the safety of equipment and personnel.

[0028] When this embodiment is used:

[0029] like Figure 2 As shown, after inputting the running program and setting the running parameters through the communication between the host computer 2 and the PLC controller 14, the PLC controller 14 issues a motion control instruction to control the output of the servo driver 15, and then the servo driver 15 issues a motor motion instruction to the servo motor, and the servo motor operates according to the set speed and torque. The drive device 8 composed of the servo motor and the reducer drives the motion slide 7 to make reciprocating linear motion at a certain frequency and amplitude through the high-precision linear module 3, simulating the low-frequency vibration (simple harmonic motion) during the operation of the vehicle.

[0030] The vibration signal is synchronously collected by the detection sensor 6 and compared with the data measured by the measured object 5 (the measured sensor or instrument), and the low-frequency response performance of the measured object 5 is detected and analyzed based on the data.

[0031] At the same time, the moving position of the moving slide 7 measured by the grating ruler 9 is compared and analyzed with the position of the moving slide 7 converted from the position control parameters of the servo motor to detect and ensure the operating stability of the test bench.

[0032] Before the test task begins, install the instrument under test and the calibration sensor on the test bench motion slide. After the test task begins, the test bench is powered on, the main circuit breaker and each sub-circuit breaker are closed, the electrical components of the test bench are powered on and hot standby, the host computer software starts running and automatically completes initialization. The front and rear end limit position parameters of the slide carrying the test piece (except for the soft protection settings of the hard limit switches at both ends of the synchronous belt linear module) can generally use the default values ​​set by the software, or they can be modified within the limit range specified by the software.

[0033] In the specific implementation of this embodiment: the dynamic parameters of the test bench operation within the specified range are input into the host computer 2, including four parameters such as forward speed, forward position, backward speed, and backward position. After the dynamic parameters are input, if the test needs to be started from the zero end, the corresponding button in the host computer 2 or the corresponding button of the operation control box 11 can be used to realize the reset to zero, and the motion slide 7 can also start running at any current position. The set dynamic parameters of the operation are written into the data through the communication between the host computer 2 and the PLC controller 14, and the PLC controller 14 outputs the corresponding instructions to the servo driver 15, and the servo driver 15 drives the servo motor to work. The servo motor realizes the high-precision conversion from rotational motion to linear motion through the reducer and the synchronous belt linear module 3. Within the set pulse frequency and pulse number range, the servo motor drives the slide 7 to perform reciprocating linear motion of a certain stroke and speed through periodic forward and reverse rotation, effectively simulating the simple harmonic motion accompanying the vehicle operation, especially being able to simulate the low-frequency vibration of the vehicle body.

[0034] During the operation of the test bench, the operating status of the servo motor is monitored in real time, and the alarm fault information is classified, including 6 categories such as positive limit, auxiliary limit, axis origin, enable, start, and stop. Once the test bench has an operating fault, it will sound an alarm and automatically stop running. The host computer 2 can view the specific fault information, reset the fault with one key, and can also run forward or reverse to find the cause of the fault. During the operation of the test bench, the servo motor feedback is converted and calculated to obtain five parameters such as position, speed, torque, running direction, and number of operations. The measured data of the grating ruler 9 is also read and displayed, and these data can be recorded locally as needed.

[0035] During the test, the object 5 on the test bench moving slide 7 synchronously collects and records the simulated vibration information, mainly including the frequency and amplitude of the vibration. After the test is completed, the accuracy analysis of the object 5 is carried out based on the data recorded by both. In order to ensure the stability of the test bench operation, the measurement data of the grating ruler 8 on the moving slide position 7 needs to be recorded regularly and compared with the set position parameters for analysis.

[0036] During the operation of the test bench, the operation can be suspended at any time by pressing the corresponding button in the host computer 2 or the corresponding button of the operation control box 11. After the test task is completed, the power is turned off and the site is cleaned up.

[0037] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A low-frequency vibration test bench for vehicle testing equipment, characterized in that: It comprises a test bench, on which a linear module is arranged, on which a moving slide is arranged, a sliding fit is formed between the moving slide and the linear module, a mounting platform is arranged on the moving slide, a detection sensor is arranged on the mounting platform, and the linear module is connected to a driving device.

2. A low-frequency vibration test bench for vehicle testing equipment according to claim 1, characterized in that: The driving device includes a servo motor and a reducer, wherein the servo motor drives the linear module through the reducer, and the servo motor is connected and controlled by a servo driver.

3. A low-frequency vibration test bench for vehicle testing equipment according to claim 2, characterized in that: The servo driver is connected to the host computer through a PLC controller.

4. A low-frequency vibration test bench for vehicle testing equipment according to claim 1, characterized in that: The vibration signal of the detection sensor is connected to the host computer through the detection data acquisition system.

5. The low-frequency vibration test bench for vehicle testing equipment according to claim 1, characterized in that: An origin switch and a limit switch are arranged on the linear module.

6. A low-frequency vibration test bench for vehicle testing equipment according to claim 1, characterized in that: A grating ruler is arranged on one side of the linear module.

7. A low-frequency vibration test bench for vehicle testing equipment according to claim 1, characterized in that: An operation control box is arranged on one side of the test bench.

8. The low-frequency vibration test bench for vehicle inspection equipment according to claim 1, characterized in that: The test bench is also provided with an auxiliary electrical module.

Images