A starting friction torque tester measurement and control system and method

Abstract

The application discloses a kind of starting friction torque tester measurement and control system and measurement and control method, belong to bearing detection technical field.It includes industrial computer, expansion board, data acquisition module and drive loading module, wherein, industrial computer is connected with expansion board in two-way, expansion board is connected with drive loading module in two-way, data acquisition module is connected with expansion board, drive loading mechanism is provided with two, symmetrically set in the two sides of the measuring tool of starting friction torque tester.The application can improve measurement accuracy and reliability, and can carry out automatic test process, improve test efficiency and reduce manual operation.

Description

Technical Field

[0001] This invention relates to a starting friction torque tester control system and control method, belonging to the field of bearing testing technology. Background Technology

[0002] The starting friction torque of a bearing refers to the resistance torque that the inner and outer rings of the bearing must overcome at the instant they begin to rotate relative to each other under certain radial, axial, and preload forces. It is an important indicator for evaluating the dynamic performance of a bearing. Its value is affected by factors such as bearing design parameters, machining quality, load, and lubrication conditions. In high-end applications such as aerospace and aviation, the magnitude of the starting friction torque of bearings affects the accuracy, sensitivity, and flexibility of the system. Furthermore, since the starting friction torque of a bearing is a discrete random process, the calculated results have a large error compared to the actual value. Therefore, measurement methods are used to effectively guide engineering applications and provide experimental support for theoretical research.

[0003] Existing bearing friction torque measuring devices are all designed for one or a pair of bearings. A certain axial or radial force is applied to the bearing to measure its friction torque value under given force conditions. This method cannot truly reflect the actual friction torque value experienced by the bearing when it is working in the system. Furthermore, there is limited research on the mechanical structure of such friction torque testers and the measurement and control systems and methods applied to such mechanical structures. Therefore, it is essential to measure the starting friction torque value in the rotation direction under actual working conditions for miniature rolling bearings used in specific shaft systems. Summary of the Invention

[0004] This invention proposes a control system and method for a starting friction torque tester, which solves the problem that there is no control system and method for this mechanical structure in the prior art.

[0005] A starting friction torque tester control system includes an industrial computer, an expansion board, a data acquisition module, and a drive loading module. The industrial computer is bidirectionally connected to the expansion board, the expansion board is bidirectionally connected to the drive loading module, the data acquisition module is connected to the expansion board, and two drive loading mechanisms are provided, symmetrically arranged on both sides of the measuring fixture in the starting friction torque tester.

[0006] Furthermore, the industrial control computer is used to receive the signal values ​​collected by the data acquisition module. When it is determined that the change pattern of the collected signal values ​​reaches the preset conditions, it sends a command to the drive loading module to stop loading and drive the calibration axis to return to the position of the measured part.

[0007] An expansion board is used to integrate an industrial computer, a data acquisition module, and a driver loading module, enabling information to be exchanged between the data acquisition module and the industrial computer, and between the industrial computer and the driver loading module.

[0008] The data acquisition module is used to measure the maximum static friction force in the left and right directions in a certain rotation direction of the universal joint of the tie rod of the test part, and to transmit the acquired signal value back to the industrial control computer.

[0009] The driver loading module is used to receive commands from the industrial control computer to load or stop loading, and to return the tested component to its original position.

[0010] Furthermore, the data acquisition module includes a first force sensor, a second force sensor, a first data acquisition card, and a second data acquisition card. The first force sensor is connected to the first data acquisition card, the second force sensor is connected to the second data acquisition card, and both the first and second data acquisition cards are connected to the expansion board.

[0011] Furthermore, the drive loading module includes a left loading motor driver, a left loading motor, a reset motor driver, a reset motor, a right loading motor driver, and a right loading motor. The left loading motor driver and the left loading motor are connected by signals, the reset motor driver and the reset motor are connected by signals, and the right loading motor driver and the right loading motor are connected by signals.

[0012] Furthermore, the expansion board includes a USB interface integrated chip, a USB-to-serial chip, an RS-485 communication interface chip, a 24V power supply, a 12V step-down chip, a 5V step-down chip, and a 3.3V step-down chip. The 24V power supply, 12V step-down chip, 5V step-down chip, and 3.3V step-down chip are electrically connected in sequence. The 24V power supply directly powers the left loading motor driver, the reset motor driver, and the right loading motor driver. The stepped-down 12V power supply powers the left loading motor, the reset motor, and the right loading motor. The stepped-down 5V power supply powers the USB-to-serial chip. The stepped-down 3.3V power supply powers both the USB interface integrated chip and the RS-485 communication interface chip. The RS-485 communication interface chip is bidirectionally connected to the left loading motor driver, the reset motor driver, the right loading motor driver, and the USB-to-serial chip. The USB-to-serial chip is bidirectionally connected to the industrial control computer through the USB interface integrated chip. Both the first data acquisition card and the second data acquisition card are connected to the USB interface integrated chip.

[0013] A method for controlling and measuring a starting friction torque tester, applied to the aforementioned starting friction torque tester control system, includes the following steps:

[0014] S100 After the test piece is clamped, start the friction torque tester and power on the measurement and control system. The industrial control computer controls the measurement and control system to complete initialization and self-test.

[0015] S200: Determine whether to perform automatic measurement. If yes, proceed to S210; otherwise, proceed to S220.

[0016] S210, the left and right data acquisition modules alternately start to acquire the friction torque numerical signal. Before and after each measurement, the drive loading module resets the measured part. After reaching the preset number of measurements, the continuous measurement is completed.

[0017] S211. The industrial control computer determines whether the actual number of measurements is greater than the preset number of measurements. If so, it executes S212; otherwise, it returns to S210.

[0018] S212. The industrial control computer calculates the standard deviation of multiple measurement results. If it exceeds the reference threshold set by the system, the test data is deemed unqualified. The measurement parameters need to be readjusted and the starting friction torque value of the test part needs to be manually analyzed. If it does not exceed the reference threshold set by the system, the test data is deemed qualified and S230 is executed.

[0019] S220: The industrial control computer controls the rotation of the reset motor. By starting the reset sliding platform of the friction torque tester, the calibration axis moves upward to reset the test piece. The reset motor decelerates to zero and reverses, and the calibration axis moves downward back to zero. The loading motor rotates, driving the loading module to move through the loading sliding platform. The force sensor collects the repulsive force signal between the two permanent magnets in real time. The measured friction torque value is displayed according to the product of force and lever arm. When the friction torque value reaches its maximum value and begins to decrease, the loading motor decelerates to zero and reverses, driving the loading module to quickly move backward back to zero. At this time, the reset motor is controlled to rotate, driving the calibration axis to move upward through the reset sliding platform to reset the test piece. The reset motor decelerates to zero and reverses, and the calibration axis moves downward back to zero. A single measurement is completed, and S230 is executed.

[0020] S230, Measurement complete.

[0021] Furthermore, S210 includes the following steps:

[0022] S211, The reset motor in the drive loading module is started to reset the tested component;

[0023] S212, The loading motor driver on one side of the driving loading module is controlled by the industrial control computer, which drives the loading motor to start.

[0024] S213. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the same side and calculates the starting friction torque value.

[0025] S214. The industrial control computer controls the driver of the loading motor on the same side to drive the loading motor back to zero.

[0026] S215, The industrial control computer controls the reset motor driver to drive the reset motor to reset the test component;

[0027] S216. The load motor driver on the opposite side of the drive loading module is controlled by the industrial control computer, which drives the load motor to start.

[0028] S217. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the opposite side and calculates the starting friction torque value.

[0029] S218, The industrial control computer controls the driver of the opposite-side loading motor to drive the loading motor back to zero.

[0030] Furthermore, S220 includes the following steps:

[0031] S221. The reset calibration unit resets the device under test.

[0032] S222, The loading motor driver on one side of the loading module drives the loading motor to start;

[0033] S223. Obtain the peak signal from the force sensor and calculate the starting friction torque value;

[0034] S224, The same-side loading motor driver drives the loading motor back to zero.

[0035] A storage medium storing a computer program, which, when executed by a processor, implements the aforementioned method for controlling the start of a friction torque tester.

[0036] A computer device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described method for controlling the start of a friction torque tester.

[0037] The beneficial effects of this invention are:

[0038] 1. Improve measurement accuracy and reliability: By combining the signal values ​​acquired by the data acquisition module with the measurement method, multiple measurement results can be obtained and the standard deviation can be calculated, thereby judging the qualification of the measurement data, thus improving measurement accuracy and reliability and reducing errors and uncertainties.

[0039] 2. Automated Testing Process: The industrial control computer in the measurement and control system achieves automated testing through connection and control of various modules. The industrial control computer can determine whether to execute automatic measurements based on preset conditions and control the movement of the loading module and the signal acquisition of the data acquisition module, thereby achieving automation and high efficiency in testing.

[0040] 3. Improved testing efficiency and reduced manual operation: Compared to traditional manual or manual testing methods, this invention improves testing efficiency through automated control and continuous measurement. Furthermore, by analyzing and judging the measurement results, the pass / fail status of the test data can be quickly determined, reducing the workload of manual analysis. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the system structure of a starting friction torque tester control system according to the present invention;

[0042] Figure 2 This is a schematic diagram of the expansion board in the starting friction torque tester control system of the present invention;

[0043] Figure 3 A flowchart illustrating a method for starting and controlling a friction torque tester;

[0044] Figure 4 A schematic diagram of the structure of a measuring device for the starting friction torque of a miniature rolling bearing used in a universal joint;

[0045] Figure 5 A perspective view of a device for measuring the starting friction torque of a miniature rolling bearing used in a universal joint;

[0046] Figure 6 A schematic diagram of the component to be measured for a device used to measure the starting friction torque of a miniature rolling bearing in a universal joint;

[0047] Figure 7 A schematic diagram of the reset and correction mechanism for a measuring device used to measure the starting friction torque of a miniature rolling bearing applied to a universal joint;

[0048] Figure 8 A schematic diagram of the sliding assembly of a measuring device for the initiation friction torque of a miniature rolling bearing used in a universal joint;

[0049] Figure 9 A schematic diagram of the pointer of a measuring device for the initiation friction torque of a miniature rolling bearing used in a universal joint;

[0050] Figure 10 A schematic diagram of the measuring fixture for measuring the starting friction torque of a miniature rolling bearing used in a universal joint;

[0051] Figure 11 Bottom view of the measuring fixture for measuring the starting friction torque of a miniature rolling bearing used in a universal joint.

[0052] The components are as follows: 1. Support structure; 2. Arc-shaped guide rail; 3. Clamping and positioning mechanism; 4. Measured part; 5. Measuring fixture; 6. First magnetic component; 7. Correction hole; 8. Reset and correction mechanism; 9. Correction shaft; 10. Drive loading mechanism; 11. Second magnetic component; 12. Force sensor; 13. Sliding assembly; 14. Rotating assembly; 15. Pull rod fixing seat; 16. Locking slider; 17. Locking handle; 18. Slider mounting seat; 19. Pointer; 20. Rotating component; 21. Fixing plate; 22. Reset drive mechanism; 23. Reset sliding platform; 24. Reset support seat; 25. Mounting base; 26. Loading sliding platform; 27. Loading drive structure; 28. Loading mounting seat; 29. ​​Loading rod; 30. Permanent magnet; 31. Frame; 32. Adjusting block; 33. Spring pin; 34. Positioning pin; 35. Hinge bolt; 36. Rotating handle. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] In the accompanying drawings of specific embodiments of the present invention, in order to better and more clearly describe the working principle of each component in the system and show the connection relationship of each part in the device, only the relative positional relationship between each component is clearly distinguished. It does not constitute a limitation on the signal transmission direction, connection sequence, or size, dimension, and shape of each part within the component or structure.

[0055] Reference Figures 4-11 As shown, the present invention provides a starting friction torque tester measurement and control system and method, which is based on a starting friction torque tester. For ease of understanding, the structure of the starting friction torque tester is described below.

[0056] A measuring device for measuring the starting friction torque of a miniature rolling bearing used in a universal joint, comprising:

[0057] Support structure 1, with arc-shaped guide rail 2 on support structure 1;

[0058] The clamping and positioning mechanism 3 is mounted on the support structure 1, and the workpiece to be measured 4 is mounted on the clamping and positioning mechanism 3.

[0059] Measuring fixture 5 is located at the free end of the workpiece 4 to be measured. A first magnetic element 6 is provided on the side wall of measuring fixture 5, and a calibration hole 7 is provided at the bottom of measuring fixture 5.

[0060] A reset and calibration mechanism 8 is provided on the support structure 1. The reset and calibration mechanism 8 includes a calibration shaft 9, which cooperates with a calibration hole 7 and is used to reset the measuring fixture 5.

[0061] Two drive loading mechanisms 10 are symmetrically arranged on both sides of the measuring fixture 5 and located on the support structure 1. The end of the drive loading mechanism 10 is provided with a second magnetic element 11. The drive loading mechanism 10 drives the second magnetic element 11 to reciprocate on the support structure 1 and approach the measuring fixture 5.

[0062] Force sensor 12 is mounted on drive loading mechanism 10.

[0063] Furthermore, the clamping and positioning mechanism 3 includes:

[0064] The sliding component 13 is disposed on the arc-shaped guide rail 2, and the sliding component 13 slides on the arc-shaped guide rail 2;

[0065] The rotating component 14 is mounted on the sliding component 13, and a pull rod fixing seat 15 is provided on the rotating component 14. The part to be measured 4 is mounted on the pull rod fixing seat 15.

[0066] Furthermore, the sliding component 13 includes:

[0067] The locking slider 16 is slidably mounted on the arc-shaped guide rail 2, and a locking handle 17 is provided on the locking slider 16;

[0068] The slider mounting base 18 is located on the locking slider 16, and the rotating component 14 is embedded in the slider mounting base 18.

[0069] Furthermore, the sliding assembly 13 also includes multiple sliders, which are disposed on the arc-shaped guide rail 2 and connected to the locking slider 16.

[0070] Furthermore, the rotating component 14 includes:

[0071] The rotating component 20 is located inside the slider mounting base 18, and a rotating handle is provided on the rotating component 20;

[0072] The fixing plate 21 is located at the bottom of the rotating part 20 and is connected to the rotating part 20 by screws, and the pull rod fixing seat 15 is located on the fixing plate 21.

[0073] Furthermore, the reset and correction mechanism 8:

[0074] Reset drive mechanism 22, which is connected to reset sliding platform 23;

[0075] The reset support 24 is located on the reset sliding platform 23, and the correction shaft 9 is located on the reset support 24.

[0076] Furthermore, the drive loading mechanism 10 includes:

[0077] Mounting base 25 is provided on support structure 1, and loading sliding platform 26 is provided on mounting base 25. Loading driving structure 27 is provided at one end of loading sliding platform 26.

[0078] The loading mounting base 28 is disposed on the loading sliding platform 26, and the second magnetic component 11 is disposed on the loading mounting base 28.

[0079] Furthermore, the second magnetic element 11 includes:

[0080] A loading rod 29 is mounted on a loading mounting base 28, and a force sensor 12 is mounted on the free end of the loading rod 29.

[0081] The permanent magnet 30 is mounted on the loading rod 29 and is positioned at the input of the force sensor 12.

[0082] A method for operating the above-described measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint includes:

[0083] A measuring fixture 5 is set on the free end of the workpiece 4 to be measured, and the workpiece 4 to be measured is set on the clamping and positioning mechanism 3. The position of the workpiece 4 to be measured is corrected by the alignment shaft 9 on the reset and alignment mechanism 8 cooperating with the alignment hole 7 at the bottom of the measuring fixture. Then, the second magnetic component 11 on the drive loading mechanism 10 reciprocates relative to the first magnetic component 6 on the measuring fixture 5, and the force sensor 12 detects the maximum static friction force of the workpiece 4 in the rotation direction, thereby calculating the starting friction torque value in the rotation direction.

[0084] A measurement system for measuring the starting friction torque of a miniature rolling bearing used in a universal joint includes the aforementioned measuring device for measuring the starting friction torque of a miniature rolling bearing used in a universal joint.

[0085] Reference Figures 1-3 As shown, this invention proposes an embodiment of a starting friction torque tester control system. The starting friction torque tester control system includes an industrial control computer, an expansion board, a data acquisition module, and a drive loading module. The industrial control computer is bidirectionally connected to the expansion board, the expansion board is bidirectionally connected to the drive loading module, the data acquisition module is connected to the expansion board, and there are two drive loading mechanisms, symmetrically arranged on both sides of the measuring fixture in the starting friction torque tester.

[0086] Specifically, the system features two drive loading mechanisms symmetrically positioned on either side of the measuring fixture that initiates the friction torque tester. This ensures a uniform torque is applied to the fixture during testing, thereby accurately measuring the friction torque value. The system consists of an industrial control computer, an expansion board, a data acquisition module, and a drive loading module. The industrial control computer is bidirectionally connected to the expansion board, the expansion board is bidirectionally connected to the drive loading module, and the data acquisition module is connected to the expansion board. This configuration enables comprehensive measurement and control functions, including data acquisition, control, and monitoring, to ensure the accuracy and reliability of the test. Through the connection between the industrial control computer and the expansion board, and the cooperation of the data acquisition module, the system can automate the testing process, improving testing efficiency while reducing the need for manual operation.

[0087] Furthermore, the industrial control computer is used to receive the signal values ​​collected by the data acquisition module. When it is determined that the change pattern of the collected signal values ​​reaches the preset conditions, it sends a command to the drive loading module to stop loading and drive the calibration axis to return to the position of the measured part.

[0088] An expansion board is used to integrate an industrial computer, a data acquisition module, and a driver loading module, enabling information to be exchanged between the data acquisition module and the industrial computer, and between the industrial computer and the driver loading module.

[0089] The data acquisition module is used to measure the maximum static friction force in the left and right directions in a certain rotation direction of the universal joint of the tie rod of the test part, and to transmit the acquired signal value back to the industrial control computer.

[0090] The driver loading module is used to receive commands from the industrial control computer to load or stop loading, and to return the tested component to its original position.

[0091] Specifically, the industrial control computer plays a crucial role in this system. It receives signal values ​​from the data acquisition module and judges the changing patterns of these signal values ​​based on preset conditions. Once the preset conditions are met, the industrial control computer sends a command to the drive loading module to stop loading and to drive the calibration axis back into position with the workpiece under test. This enables control of the loading process and automatic repositioning of the workpiece under test.

[0092] The expansion board integrates the industrial computer, data acquisition module, and driver loading module in the system to facilitate information transmission. It connects the industrial computer and the data acquisition module, allowing the acquired signal values ​​to be transmitted to the industrial computer for processing. Simultaneously, the expansion board also connects the industrial computer and the driver loading module, enabling the industrial computer to send commands to the loading module to control loading or stop loading.

[0093] The data acquisition module is used to measure the maximum static friction force in the left and right directions of a certain rotation direction of the universal joint of the tie rod under test. It collects and measures the corresponding signal values ​​and sends them back to the industrial control computer. In this way, the industrial control computer can make judgments and controls based on these signal values, and decide whether to stop loading and return the test part to its original position.

[0094] The drive loading module is responsible for loading or stopping the loading process, as well as homing the workpiece under test. It receives commands from the industrial control computer and executes the loading or stopping operations accordingly. When the industrial control computer determines that loading needs to be stopped, it sends a corresponding command to the drive loading module to stop loading. When it is necessary to control the calibration axis to hom the workpiece under test, the drive loading module is also responsible for driving the calibration axis to perform a linear feed motion in the vertical direction.

[0095] Furthermore, the data acquisition module includes a first force sensor, a second force sensor, a first data acquisition card, and a second data acquisition card. The first force sensor is connected to the first data acquisition card, the second force sensor is connected to the second data acquisition card, and both the first and second data acquisition cards are connected to the expansion board.

[0096] Specifically, the data acquisition module plays a crucial role in the system, acquiring the signal values ​​of the maximum static friction force in both the left and right directions of a certain rotational direction of the universal joint of the test component's tie rod. The first and second force sensors measure the force signals related to the test component. The first and second data acquisition cards receive signals from the force sensors, convert them into digital signals for processing and recording. The expansion board integrates and transmits information within the system. Through the expansion board, the acquired signal values ​​can be transmitted to the industrial control computer for further processing, judgment, and control.

[0097] The data acquisition module uses two FUTEK LSB200 force sensors and a matching USB220-FSH3927 data acquisition card.

[0098] This combination of data acquisition modules enables the measurement and acquisition of force signals from the tested component, which are then transmitted to an industrial control computer for processing and control. In this way, the friction torque tester's control system can acquire and record the maximum static friction force in different directions of the tested component, thereby enabling performance evaluation and analysis.

[0099] Furthermore, the drive loading module includes a left loading motor driver, a left loading motor, a reset motor driver, a reset motor, a right loading motor driver, and a right loading motor. The left loading motor driver and the left loading motor are connected by signals, the reset motor driver and the reset motor are connected by signals, and the right loading motor driver and the right loading motor are connected by signals.

[0100] Specifically, the drive loading module is responsible for implementing the functions of loading or stopping loading, and controlling the calibration axis to return to the position of the workpiece under test.

[0101] In this embodiment, three sets of DM522-RC motor drivers and Shinano 42 stepper motors are selected to control the linear feed motion of the stress loading unit in the left and right directions and the linear feed motion of the reset and correction unit.

[0102] The left loading motor driver controls the operation of the left loading motor and outputs appropriate signals to drive it. The left loading motor is responsible for providing the loading force on the left side and participates in the measurement process.

[0103] The reset motor driver controls the operation of the reset motor and outputs appropriate signals to drive it. The function of the reset motor is to drive the calibration shaft in a linear feed motion to reset the workpiece under test.

[0104] The right-side loading motor driver controls the operation of the right-side loading motor and outputs appropriate signals to drive it. The right-side loading motor is responsible for providing the loading force on the right side and participates in the measurement process.

[0105] The drive loading module enables control and operation of the loading mechanism. Through the coordinated work of the motor and driver within the drive loading module, the system can control the loading process, including applying and stopping the loading force. It can also reset the test piece by driving the calibration shaft via the reset motor, preparing for the next test. This configuration ensures the accuracy and reliability of the loading process, providing a stable and controllable loading mechanism for starting the friction torque tester.

[0106] Furthermore, the expansion board includes a USB interface integrated chip, a USB-to-serial chip, an RS-485 communication interface chip, a 24V power supply, a 12V step-down chip, a 5V step-down chip, and a 3.3V step-down chip. The 24V power supply, 12V step-down chip, 5V step-down chip, and 3.3V step-down chip are electrically connected in sequence. The 24V power supply directly powers the left loading motor driver, the reset motor driver, and the right loading motor driver. The stepped-down 12V power supply powers the left loading motor, the reset motor, and the right loading motor. The stepped-down 5V power supply powers the USB-to-serial chip. The stepped-down 3.3V power supply powers both the USB interface integrated chip and the RS-485 communication interface chip. The RS-485 communication interface chip is bidirectionally connected to the left loading motor driver, the reset motor driver, the right loading motor driver, and the USB-to-serial chip. The USB-to-serial chip is bidirectionally connected to the industrial control computer through the USB interface integrated chip. Both the first data acquisition card and the second data acquisition card are connected to the USB interface integrated chip.

[0107] Specifically, the Microsoft-manufactured USB2514B is selected as the USB interface integrated chip for the expansion board. This chip can expand to four USB interfaces. Two of these USB interfaces are used to connect the data acquisition cards of the two force sensors. Since the stepper motor driver uses RS485 communication, one of its interfaces needs to be connected to the USB-to-serial chip CH343G to ensure normal data transmission. The remaining USB interface can be reserved as a spare interface. Except for the host computer, which uses an independent power supply, the measurement and control system uses a 24V DC power supply. The 24V power supply directly powers the motor driver, and then splits into two paths. One path is stepped down to 12V via the WRB2412S-3WR2 stepper chip to power the three stepper motors. The other path is stepped down to 5V via the WRB2405S-10WR3 stepper chip to power the CH340G chip, and then stepped down to 3.3V via the AMS1117-3.3 stepper chip to power the USB2514B hub chip and the MAX485ESA chip.

[0108] The expansion board enables integration and communication between various modules of the system, and provides stable power support and data transmission capabilities for the entire starting friction torque tester control system.

[0109] A method for controlling and measuring a starting friction torque tester, applied to the aforementioned starting friction torque tester control system, includes the following steps:

[0110] S100 After the test piece is clamped, start the friction torque tester and power on the measurement and control system. The industrial control computer controls the measurement and control system to complete initialization and self-test.

[0111] S200: Determine whether to perform automatic measurement. If yes, proceed to S210; otherwise, proceed to S220.

[0112] S210, the left and right data acquisition modules alternately start to acquire the friction torque numerical signal. Before and after each measurement, the drive loading module resets the measured part. After reaching the preset number of measurements, the continuous measurement is completed.

[0113] S211. The industrial control computer determines whether the actual number of measurements is greater than the preset number of measurements. If so, it executes S212; otherwise, it returns to S210.

[0114] S212. The industrial control computer calculates the standard deviation of multiple measurement results. If it exceeds the reference threshold set by the system, the test data is deemed unqualified. The measurement parameters need to be readjusted and the starting friction torque value of the test part needs to be manually analyzed. If it does not exceed the reference threshold set by the system, the test data is deemed qualified and S230 is executed.

[0115] S220: The industrial control computer controls the rotation of the reset motor. By starting the reset sliding platform of the friction torque tester, the calibration axis moves upward to reset the test piece. The reset motor decelerates to zero and reverses, and the calibration axis moves downward back to zero. The loading motor rotates, driving the loading module to move through the loading sliding platform. The force sensor collects the repulsive force signal between the two permanent magnets in real time. The measured friction torque value is displayed according to the product of force and lever arm. When the friction torque value reaches its maximum value and begins to decrease, the loading motor decelerates to zero and reverses, driving the loading module to quickly move backward back to zero. At this time, the reset motor is controlled to rotate, driving the calibration axis to move upward through the reset sliding platform to reset the test piece. The reset motor decelerates to zero and reverses, and the calibration axis moves downward back to zero. A single measurement is completed, and S230 is executed.

[0116] S230, Measurement complete.

[0117] Specifically, this method involves the control of the measurement and control system by an industrial control computer, realizing an automated measurement process. By determining whether to execute automatic measurement, automatic or manual operation can be selected as needed, improving measurement efficiency and accuracy. In step S210, the data acquisition modules on the left and right sides alternately perform multiple measurements to obtain more reliable and accurate measurement results. In step S212, the industrial control computer calculates the standard deviation of the multiple measurement results to evaluate the stability of the measurement results. This method of multiple measurements and data processing improves the accuracy and reliability of the measurement. In step S210, the loading motor applies a loading force by driving the loading module and collects the repulsive force signal between the two permanent magnets in real time, displaying the measured starting friction torque value based on the product of force and lever arm. This process can quantitatively measure and display the change in the starting friction torque value, making the measurement results more intuitive and readable. In step S212, the industrial control computer determines the passability of the test data based on whether the standard deviation of the measurement results exceeds the reference threshold set by the system. This passability determination process can quickly and accurately assess whether the measurement results meet expectations, aiding in data analysis and decision-making. This method enables automated measurement, multiple measurements and data processing, acquisition and display of starting friction torque values, and qualification of measurement data. It can improve the efficiency, accuracy and reliability of measurement, and provides an effective measurement and control method for the application of starting friction torque testers.

[0118] Furthermore, S210 includes the following steps:

[0119] S211, The reset motor in the drive loading module is started to reset the tested component;

[0120] S212, The loading motor driver on one side of the driving loading module is controlled by the industrial control computer, which drives the loading motor to start.

[0121] S213. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the same side and calculates the starting friction torque value.

[0122] S214. The industrial control computer controls the driver of the loading motor on the same side to drive the loading motor back to zero.

[0123] S215, The industrial control computer controls the reset motor driver to drive the reset motor to reset the test component;

[0124] S216. The load motor driver on the opposite side of the drive loading module is controlled by the industrial control computer, which drives the load motor to start.

[0125] S217. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the opposite side and calculates the starting friction torque value.

[0126] S218, The industrial control computer controls the driver of the opposite-side loading motor to drive the loading motor back to zero.

[0127] Specifically, in step S210, the data acquisition modules on the left and right sides alternately acquire the starting friction torque value signal. By acquiring data from different sides multiple times, more comprehensive and accurate measurement results can be obtained. This multi-side data acquisition method can avoid the influence of local factors or errors on single-side data, improving measurement accuracy. Before and after each measurement, the drive loading module performs a reset operation on the measured part. This helps ensure that the initial state of the measured part is consistent before each measurement and eliminates the influence of the previous loading on subsequent measurements. The reset operation can improve the repeatability and stability of the measurement. In steps S213 and S217, the industrial control computer acquires and calculates the peak signals output by the force sensors on the same and opposite sides to obtain the starting friction torque value. These calculation results can provide an evaluation and analysis of the starting performance of the measured part. Through multiple measurements and calculations, more accurate and reliable starting friction torque values ​​can be obtained. In steps S213 and S217, the industrial control computer records and saves the starting friction torque value of each measurement. These data can be used for subsequent data processing and analysis, such as calculating the average value and standard deviation, to evaluate the performance and stability of the test component. This provides fundamental data for subsequent quality control and improvement of the test component.

[0128] The beneficial effects of multi-side data acquisition, reset operation, calculation of initiation friction torque value, and data recording and analysis in step S210 can improve the accuracy, repeatability and reliability of measurement, and provide a foundation for further data processing and quality control.

[0129] Furthermore, S220 includes the following steps:

[0130] S221. The reset calibration unit resets the device under test.

[0131] S222, The loading motor driver on one side of the loading module drives the loading motor to start;

[0132] S223. Obtain the peak signal from the force sensor and calculate the starting friction torque value;

[0133] S224, The same-side loading motor driver drives the loading motor back to zero.

[0134] Specifically, in step S210, alternating measurements by the left and right data acquisition modules allow for more comprehensive and integrated data acquisition. This multi-sided data acquisition balances the influence of local factors, improving measurement accuracy. Simultaneously, during the reset operation, returning the workpiece fixture to its initial position before each measurement ensures consistency of measurement conditions, further enhancing accuracy. The reset operation eliminates the influence of previous loading on subsequent measurements, guaranteeing consistent starting states for each measurement. This improves measurement repeatability, ensuring that multiple measurements under identical conditions tend to yield consistent results. Through relatively independent multiple acquisitions and calculations, a series of starting friction torque values ​​can be obtained. These multiple measurement results can be used for subsequent data processing and analysis. By calculating statistical indicators such as the average and standard deviation, measurement results can be evaluated, improving reliability and providing a basis for quality control and improvement. In the data recording and analysis phase, saving and organizing multiple measurement results allows for more in-depth data analysis. For example, calculating statistical indicators such as the average, standard deviation, and range helps determine the stability and consistency of measurement results. This provides a foundation for further quality control and improvement, allowing potential problems to be identified and appropriate measures to be taken.

Claims

1. A control system for a starting friction torque tester, characterized in that, The starting friction torque tester control system includes an industrial computer, an expansion board, a data acquisition module, and a drive loading module. The industrial computer is bidirectionally connected to the expansion board, the expansion board is bidirectionally connected to the drive loading module, and the data acquisition module is connected to the expansion board. The drive loading module includes two drive loading mechanisms and a reset correction mechanism. The two drive loading mechanisms are symmetrically arranged on both sides of the measuring fixture in the starting friction torque tester. The drive loading module includes a left loading motor driver, a left loading motor, a reset motor driver, a reset motor, a right loading motor driver, and a right loading motor. The left loading motor driver and the left loading motor are signal-connected, the reset motor driver and the reset motor are signal-connected, and the right loading motor driver and the right loading motor are signal-connected. The industrial control computer is used to receive the signal values ​​collected by the data acquisition module. When it is determined that the change pattern of the collected signal values ​​reaches the preset condition, it sends a command to the drive loading module to stop loading and drive the calibration axis to return to the position of the workpiece under test. The expansion board is used to integrate the industrial computer, the data acquisition module and the driver loading module together, so that information can be transmitted between the data acquisition module and the industrial computer, and between the industrial computer and the driver loading module. The data acquisition module is used to measure the maximum static friction force in the left and right directions in a certain rotation direction of the universal joint of the tie rod cross shaft of the test part, and to transmit the acquired signal value back to the industrial control computer. The drive loading module is used to receive commands from the industrial control computer to load or stop loading, and to drive the calibration axis to return to the position of the workpiece under test. The data acquisition module includes a first force sensor, a second force sensor, a first data acquisition card, and a second data acquisition card. The first force sensor is connected to the first data acquisition card, and the second force sensor is connected to the second data acquisition card. Both the first data acquisition card and the second data acquisition card are connected to the expansion board. The first magnetic component is mounted on the side wall of the measuring fixture, and the second magnetic component is mounted on the end of the driving loading mechanism.

2. The starting friction torque tester control system according to claim 1, characterized in that, The expansion board includes a USB interface integrated chip, a USB-to-serial chip, an RS-485 communication interface chip, a 24V power supply, a 12V step-down chip, a 5V step-down chip, and a 3.3V step-down chip. The 24V power supply, 12V step-down chip, 5V step-down chip, and 3.3V step-down chip are electrically connected in sequence. The 24V power supply directly powers the left loading motor driver, the reset motor driver, and the right loading motor driver. The stepped-down 12V power supply powers the left loading motor, the reset motor, and the right loading motor. The stepped-down 5V power supply powers the USB-to-serial chip. The stepped-down 3.3V power supply powers both the USB interface integrated chip and the RS-485 communication interface chip. The RS-485 communication interface chip is bidirectionally connected to the left loading motor driver, the reset motor driver, the right loading motor driver, and the USB-to-serial chip. The USB-to-serial chip is bidirectionally connected to the industrial control computer via the USB interface integrated chip. Both the first and second data acquisition cards are connected to the USB interface integrated chip.

3. A method for measuring and controlling a starting friction torque tester, applied to a starting friction torque tester measurement and control system as described in claim 1 or 2, characterized in that, The method for controlling the start-up friction torque tester includes the following steps: S100. After the test piece is clamped, start the friction torque tester. Wait for the measurement and control system to be powered on. The industrial control computer controls the measurement and control system to complete initialization and self-test. S200: Determine whether to perform automatic measurement. If yes, proceed to S210; otherwise, proceed to S220. S210, the left and right data acquisition modules alternately start to acquire the friction torque numerical signal. Before and after each measurement, the drive loading module resets the measured part. After reaching the preset number of measurements, the continuous measurement is completed. S211. The industrial control computer determines whether the actual number of measurements is greater than the preset number of measurements. If so, it executes S212; otherwise, it returns to S210. S212. The industrial control computer calculates the standard deviation of multiple measurement results. If it exceeds the reference threshold set by the system, the test data is deemed unqualified. The measurement parameters need to be readjusted and the starting friction torque value of the test part needs to be manually analyzed. If it does not exceed the reference threshold set by the system, the test data is deemed qualified and S230 is executed. S220: The industrial control computer controls the rotation of the reset motor. By starting the reset sliding platform of the friction torque tester, the calibration shaft moves upward to reset the test piece. After the test piece is reset, the reset motor decelerates to zero and reverses, and the calibration shaft moves downward back to zero. The loading motor rotates, driving the loading mechanism through the loading sliding platform. The first force sensor and the second force sensor respectively collect the repulsive force signal between the first magnetic component and the second magnetic component in real time. The friction torque value is displayed according to the product of force and lever arm. When the friction torque value reaches its maximum value and begins to decrease, the loading motor decelerates to zero and reverses, driving the loading mechanism to quickly move backward back to zero. At this time, the reset motor is controlled to rotate, and the calibration shaft moves upward through the reset sliding platform to reset the test piece. After the test piece is reset, the reset motor decelerates to zero and reverses, and the calibration shaft moves downward back to zero, completing a single measurement. S230, Measurement complete.

4. The method for measuring and controlling the starting friction torque tester according to claim 3, characterized in that, S210 includes the following steps: S211, The reset motor in the drive loading module is started to reset the tested component; S212. The loading motor driver on one side of the driving loading mechanism is controlled by the industrial control computer, which drives the loading motor to start. S213. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the same side and calculates the starting friction torque value. S214. The industrial control computer controls the driver of the loading motor on the same side to drive the loading motor back to zero. S215, The industrial control computer controls the reset motor driver to drive the reset motor to reset the test component; S216. The driver of the loading motor on the opposite side of the driving loading mechanism is controlled by the industrial control computer, which drives the loading motor to start. S217. The industrial control computer collects the peak signal of the force sensor output by the force sensor on the opposite side and calculates the starting friction torque value. S218, The industrial control computer controls the driver of the opposite-side loading motor to drive the loading motor back to zero.

5. The method for measuring and controlling the starting friction torque tester according to claim 4, characterized in that, S220 includes the following steps: S221. The reset calibration unit resets the device under test. S222, The loading motor driver on one side of the driving loading mechanism drives the loading motor to start; S223. Obtain the peak signals from the first force sensor and the second force sensor, and calculate the starting friction torque value; S224, The same-side loading motor driver drives the loading motor back to zero.

6. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the starting friction torque tester measurement and control method according to any one of claims 3-5.

7. A computer device, characterized in that, include: The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a method for controlling the start-up friction torque tester as described in any one of claims 3-5.

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