Electrical control system of precision bearing dynamic friction torque tester

Abstract

The invention discloses an electrical control system of a precise bearing dynamic friction torque tester, which comprises a bearing detection electrical control system, an industrial personal computer is arranged on the bearing detection electrical control system, an acquisition card is arranged at one connecting end of the industrial personal computer, and an analog quantity module, a digital I / O and a spindle motor are arranged at the other connecting end of the industrial personal computer. A secondary instrument A and a secondary instrument B are connected to the acquisition card in a matched mode, a friction force sensor is arranged on the secondary instrument A, a loading force sensor is connected to the secondary instrument B, a Z-axis motor and an electric proportional valve are arranged on the analog quantity module in a matched mode, and a loading air cylinder is arranged at one connecting end of the electric proportional valve in a matched mode. The system adopts an industrial personal computer as a main control unit of the system to complete real-time control and data acquisition of equipment, realizes high-speed connection between a computer and an Adhua data acquisition card, realizes data acquisition of a friction force sensor and a pressure sensor, can calibrate the actual rotating speed and standard quantity of a tester at any time, and ensures the accuracy of test data.

Description

Technical Field

[0001] The invention relates to the technical field of bearing dynamic friction torque testing, in particular to an electrical control system of a precision bearing dynamic friction torque tester. Background Art

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support mechanical rotating bodies, reduce the friction coefficient during their movement, and ensure their rotation accuracy.

[0003] Bearings may seem simple, but they are the most widely used basic and key parts in various rotating equipment and mechanisms. According to historical statistics, more than 80% of the failures of moving parts and mechanisms are caused by bearing failures. Especially in some special occasions (such as space environments, continuously running production lines), bearings cannot be backed up, so once a bearing fails, it will affect the entire system and the consequences will be catastrophic.

[0004] In the past two decades, due to the problem of bearings, personnel at all levels have paid more and more attention to it. With the increasing requirements for the effectiveness of bearing quality control and performance evaluation, higher requirements have also been put forward for the previous evaluation indicators and methods.

[0005] For a long time, domestic bearing testing has been based on the static indicators of bearings and their components (inner and outer rings and balls) (such as size tolerance, shape tolerance, position tolerance and fit clearance between components, etc.) to evaluate bearings. However, static indicators cannot reflect the status under various operating conditions. Users need more dynamic indicators to understand the status of bearings during use and testing and make correct judgments.

[0006] The most basic, main and quantifiable indicator of bearing dynamic performance is friction torque, which reflects the power consumption and performance of bearing. The movement of bearing is a very complex process, which is mainly based on actual tests. First, the friction torque of single bearing is tested. Single bearing is the most basic single part. Only by starting with the most basic control can the use of bearing be effectively controlled.

[0007] However, the systems currently used for bearing detection devices are relatively simple, and are basically corresponding software developed for single bearing detection. The data collection efficiency during the detection process is low, and the detection accuracy of the bearing is insufficient. Therefore, an improved technology is urgently needed to solve this problem existing in the existing technology. Summary of the invention

[0008] The purpose of the present invention is to provide an industrial computer on a bearing detection electrical control system, one connection end of the industrial computer is provided with an acquisition card, the other connection end of the industrial computer is provided with an analog module, a digital I / O, and a spindle motor, the acquisition card is connected to a secondary instrument A and a secondary instrument B, the secondary instrument A is provided with a friction sensor, the secondary instrument B is connected to a loading force sensor, the analog module is provided with a Z-axis motor and an electrical proportional valve, and one connection end of the electrical proportional valve is provided with a loading cylinder. The system uses an industrial computer as the main control unit of the system to complete real-time control and data acquisition of the equipment, realizes high-speed connection between a computer and Advantech data acquisition card, realizes data acquisition of friction sensors and pressure sensors, can calibrate the actual rotation speed and standard quantity of the tester at any time, and ensures the accuracy of the test data. The electrical control system of the precision bearing dynamic friction torque tester is to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions: an electrical control system of a precision bearing dynamic friction torque tester, comprising a bearing detection electrical control system, wherein an industrial computer is provided on the bearing detection electrical control system, an acquisition card is provided on one connection end of the industrial computer, an analog module, a digital I / O, and a spindle motor are provided on the other connection end of the industrial computer, and the industrial computer is connected to the analog module, the digital I / O, and the spindle motor by an RS485 data bus;

[0010] The acquisition card is connected to the secondary instrument A and the secondary instrument B, and a 0-10V voltage is connected between the acquisition card and the secondary instrument A and the secondary instrument B;

[0011] The secondary instrument A is provided with a friction sensor, and a 0-30mv voltage is connected between the secondary instrument A and the friction sensor;

[0012] The secondary instrument B is connected to a loading force sensor, and a 0-30mv voltage is connected between the secondary instrument B and the loading force sensor;

[0013] The analog module is equipped with a Z-axis motor and an electric proportional valve, and a 0-10V voltage is connected between the analog module and the Z-axis motor and the electric proportional valve;

[0014] A loading cylinder is provided at one connection end of the electrical proportional valve;

[0015] The bearing detection electrical control system is equipped with an operating handle and a switch power supply.

[0016] Preferably, the industrial computer has a front panel protection level of IP65, a strong aluminum alloy shell, a 5-wire resistive touch screen, and supports 2 serial ports, 3 USB ports, 2 Gigabit network ports and a PPC-3100S electronic eye.

[0017] Preferably, the acquisition card adopts Advantech's USB-4716 acquisition card. The USB-4700 series consists of various plug-and-play data acquisition devices. The acquisition card USB-4716 provides 16 single-ended / 8 differential analog inputs, 16-bit resolution, 200kS / s sampling rate, 16-bit digital I / O, 1 counter / timer, and 2 16-bit analog outputs.

[0018] Preferably, the analog quantity module is based on the RS485 interface and the analog quantity input and output control module of the Modbus protocol, and the analog quantity module isolates the RS485 interface and supports the Modbus-RTU protocol;

[0019] The analog module uses a DC voltage of 8-30V, and the sampling accuracy of the analog module is 16-bit AD;

[0020] The current output type of the analog module is 0-20mA (21mA MAX), and the voltage output type of the analog module is 0-5V or 0-10V;

[0021] The operating temperature range of the analog module is -35°C to +50°C.

[0022] Preferably, the output signals of the secondary instrument A amplifier of the friction force sensor are connected to the acquisition card through AI0 port and AI1 port respectively.

[0023] Preferably, the switching power supply installed on the bearing detection electrical control system adopts an imported 32-bit CPU chip and a 32-bit ATMEL ARM high-speed processor;

[0024] 72MHZ operating system GCOS; 10ms scheduling mechanism; power supply voltage 24VDC@2W; power reverse connection protection; communication interface 2500V lightning protection; ESD, overvoltage, overcurrent protection.

[0025] Preferably, the electrical proportional valve and low-friction cylinder are used for automatic loading under a load greater than 10 kg, and the cylinder used for loading is SMC's MQQT series low-friction cylinder with a cylinder diameter of 40 mm and a stroke of 70 mm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The PPC-3100S electronic eye provides further detection and protection for the system, and can give clear signals about the system's operating status to help people conduct detection and analysis;

[0028] (2) The D port on the tablet computer PPC-1320S is configured as RS485 mode. The D port is connected to the RS485 switch module and analog module through the RS485 bus, thereby realizing the control of the spindle speed, Z-axis speed, Z-axis limit and return to zero, Z-axis up and down movement, loading cylinder pressure, etc. The USB2.0 interface of the computer's F port is used to realize the high-speed connection between the computer and Advantech data acquisition card, realizing data acquisition of the friction sensor and pressure sensor;

[0029] (3) The system uses an industrial computer as the main control unit of the system to complete real-time control and data acquisition of the equipment, realize high-speed connection between the computer and Advantech data acquisition card, realize real-time data acquisition of friction sensor and pressure sensor, and can calibrate the actual speed and standard quantity of the tester at any time to ensure the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the bearing detection electrical control system of the present invention.

[0031] In the figure: 1. Bearing detection electrical control system; 2. Industrial computer; 3. Acquisition card; 4. Analog module; 5. Digital I / O; 6. Spindle motor; 7. Secondary instrument A; 8. Secondary instrument B; 9. Friction force sensor; 10. Loading force sensor; 11. Z-axis motor; 12. Electric proportional valve; 13. Loading cylinder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 The present invention provides a technical solution: an electrical control system of a precision bearing dynamic friction torque tester, including a bearing detection electrical control system 1, an industrial computer 2 is provided on the bearing detection electrical control system 1, an acquisition card 3 is provided at one connection end of the industrial computer 2, an analog module 4, a digital I / O 5, and a spindle motor 6 are provided at the other connection end of the industrial computer 2, and the industrial computer 2 is connected to the analog module 4, the digital I / O 5, and the spindle motor 6 by using an RS485 data bus;

[0034] The acquisition card 3 is connected to the secondary instrument A7 and the secondary instrument B8, and a 0-10V voltage is connected between the acquisition card 3 and the secondary instrument A7 and the secondary instrument B8;

[0035] The secondary instrument A7 is provided with a friction sensor 9, and a 0-30mv voltage is connected between the secondary instrument A7 and the friction sensor 9;

[0036] The secondary instrument B8 is connected to a load force sensor 10, and a 0-30mv voltage is connected between the secondary instrument B8 and the load force sensor 10;

[0037] The analog module 4 is equipped with a Z-axis motor 11 and an electric proportional valve 12. A 0-10V voltage is connected between the analog module 4 and the Z-axis motor 11 and the electric proportional valve 12. A loading cylinder 13 is provided at one connecting end of the electric proportional valve 12. An operating handle and a switch power supply are provided on the bearing detection electrical control system 1.

[0038] Industrial Computer 2 uses Advantech's 12.1-inch SVGA ultra-thin LCD industrial tablet PC PPC-1320S, with a front panel protection level of IP65, a strong aluminum alloy shell, and a 5-wire resistive touch screen. Industrial Computer 2 supports 2 serial ports, 3 USB ports, 2 Gigabit network ports and PPC-3100S electronic eye. The PPC-3100S electronic eye further provides detection and protection for the system, and can give clear signals of the system's operating status to help people detect and analyze.

[0039] The computer provides two RS232 serial ports, one of which can be configured as RS422 or RS485 serial port mode. At the same time, the computer is equipped with two RJ45 network cable interfaces, which are convenient for users to control and transfer data through network connection. In addition, the computer is equipped with three USB ports, two of which are USB2.0 and the other is USB3.0.

[0040] The D port on the tablet computer PPC-1320S is configured as RS485 mode. The D port is connected to the RS485 switch module and analog module through the RS485 bus, thereby realizing the control of the spindle speed, Z-axis speed, Z-axis limit and return to zero, Z-axis up and down movement, and the pressure of the loading cylinder 13. The USB2.0 interface of the computer's F port is used to realize the high-speed connection between the computer and Advantech data acquisition card, realizing the data acquisition of the friction sensor and the pressure sensor.

[0041] Acquisition card 3 uses Advantech's USB-4716 acquisition card. The USB-4700 series consists of various plug-and-play data acquisition devices. Acquisition card 3 USB-4716 provides 16 single-ended / 8 differential analog inputs, 16-bit resolution, 200kS / s sampling rate, 16-bit digital I / O, 1 counter / timer, and 2 16-bit analog outputs.

[0042] The analog module 4 is an analog input and output control module based on the RS485 interface and the Modbus protocol. The analog module 4 isolates the RS485 interface and supports the Modbus-RTU protocol. The analog module 4 uses DC 8-30V, the sampling accuracy of the analog module 4 is 16-bit AD, the current output type of the analog module 4 is 0-20mA (21mA MAX), the voltage output type of the analog module 4 is 0-5V or 0-10V, and the operating temperature range of the analog module 4 is -35°C to +50°C.

[0043] The output signals of the secondary instrument A7 amplifier of the friction sensor 9 are connected to the acquisition card 3 through the AI0 port and the AI1 port respectively.

[0044] The switching power supply installed on the bearing detection electrical control system 1 adopts imported 32-bit CPU chip, 32-bit ATMELARM high-speed processor, 72MHZ operating system GCOS; 10ms scheduling mechanism, power supply voltage 24VDC@2W; power reverse connection protection, communication interface 2500V lightning protection, ESD, overvoltage and overcurrent protection.

[0045] The electric proportional valve 12 and the low-friction cylinder are used for automatic loading under a load greater than 10 kg. The cylinder used for loading is SMC's MQQT series low-friction cylinder with a cylinder diameter of 40 mm and a stroke of 70 mm. When the air pressure in the cylinder reaches 0.5 MPa, the cylinder can output a pressure of 62 kgf. This type of cylinder uses gap sealing and has low sliding resistance, and can still operate under a low pressure of 0.005 MPa.

[0046] The bearing detection electrical control system 1 uses an industrial computer as the main control unit of the system to complete the real-time control and data acquisition of the equipment, uses Qt as the development tool, and stores the collected test data in real time in the Microsoft Office Access 2007 database, and queries and manages the test data through the database.

[0047] The bearing detection electrical control system 1 mainly includes a calculation module, a rotation speed module, a loading module, a single bearing test module, and a bearing assembly or component test module.

[0048] The user sets the calculation parameters through the calculation module. For each calculated theoretical characteristic frequency value, moving the mouse to each characteristic frequency label will prompt the specific physical meaning of the characteristic frequency. After setting the parameters, the software will calculate the corresponding theoretical frequency values ​​according to the calculation formula.

[0049] Through the speed module, users can set the speed to control the forward / reverse direction of the detection device during the detection process, and can also set the continuous mode and interval mode.

[0050] In the continuous operation mode, the speed and direction can be set, and the continuous operation time can be recorded. In the interval operation mode, the speed, time, interval time and number of operations can be set for each operation. The actual speed and standard value of the tester can be calibrated at any time according to the set value and actual measurement value to ensure the accuracy of the speed value.

[0051] The loading module has two modes: weight loading and air pressure loading. In the air pressure loading mode, you can use the control button on the right side of the interface to move up or down to make the pressure head close to the bearing. You can also use the button to adjust the up and down speed to high or low speed.

[0052] When loading the air pressure, you can set the pressure and the air pressure alarm value. When the measured air pressure exceeds the alarm value, the green indicator light in the middle of the interface will turn red and an alarm will sound. After clicking the "Load" button, the cylinder will start to pressurize according to the set value. When the button changes to "Unload", clicking it again will unload the cylinder pressure.

[0053] The system uses an industrial computer as the main control unit of the system to complete real-time control and data acquisition of the equipment, realize high-speed connection between the computer and Advantech data acquisition card, realize real-time acquisition of friction sensor and pressure sensor data, and can calibrate the actual speed and standard quantity of the tester at any time to ensure the accuracy of the test data.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrical control system for a precision bearing dynamic friction torque tester, comprising a bearing detection electrical control system (1), characterized in that: The bearing detection electrical control system (1) is provided with an industrial computer (2), one connection end of the industrial computer (2) is provided with an acquisition card (3), the other connection end of the industrial computer (2) is provided with an analog module (4), a digital I / O (5), and a spindle motor (6), and the industrial computer (2) is connected to the analog module (4), the digital I / O (5), and the spindle motor (6) by using an RS485 data bus; The acquisition card (3) is connected to a secondary meter A (7) and a secondary meter B (8), and a voltage of 0-10V is connected between the acquisition card (3) and the secondary meter A (7) and the secondary meter B (8); The secondary instrument A (7) is provided with a friction sensor (9), and a 0-30mv voltage is connected between the secondary instrument A (7) and the friction sensor (9); The secondary instrument B (8) is connected to a load force sensor (10), and a 0-30mv voltage is connected between the secondary instrument B (8) and the load force sensor (10); The analog quantity module (4) is provided with a Z-axis motor (11) and an electric proportional valve (12), and a voltage of 0-10V is connected between the analog quantity module (4) and the Z-axis motor (11) and the electric proportional valve (12); A loading cylinder (13) is provided in cooperation with one connection end of the electric proportional valve (12); The bearing detection electrical control system (1) is provided with an operating handle and a switch power supply.

2. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1 is characterized in that: The industrial computer (2) has a front panel protection level of IP65, a strong aluminum alloy shell, and a 5-wire resistive touch screen. The industrial computer (2) supports 2 serial ports, 3 USB ports, 2 Gigabit network ports, and a PPC-3100S electronic eye.

3. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1 is characterized in that: The acquisition card (3) adopts Advantech's USB-4716 acquisition card. The USB-4700 series consists of various plug-and-play data acquisition devices. The acquisition card (3) USB-4716 provides 16 single-ended / 8 differential analog inputs, 16-bit resolution, 200kS / s sampling rate, 16-bit digital I / O, 1 counter / timer, and 2 16-bit analog outputs.

4. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1 is characterized in that: The analog quantity module (4) is based on an RS485 interface and an analog quantity input and output control module of the Modbus protocol. The analog quantity module (4) isolates the RS485 interface and supports the Modbus-RTU protocol. The analog quantity module (4) adopts a direct current of 8-30V, and the sampling accuracy of the analog quantity module (4) is 16-bit AD; The current output type of the analog module (4) is 0-20mA (21mA MAX), and the voltage output type of the analog module (4) is 0-5V or 0-10V; The operating temperature range of the analog quantity module (4) is -35°C to +50°C.

5. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1 is characterized in that: The amplifier output signal of the secondary instrument A (7) of the friction force sensor (9) is connected to the acquisition card (3) through the AI0 port and the AI1 port respectively.

6. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1, characterized in that: The switch power supply installed on the bearing detection electrical control system (1) adopts an imported 32-bit CPU chip and a 32-bit ATMELARM high-speed processor; 72MHZ operating system GCOS; 10ms scheduling mechanism; power supply voltage 24VDC@2W; power reverse connection protection; communication interface 2500V lightning protection; ESD, overvoltage, overcurrent protection.

7. The electrical control system of the precision bearing dynamic friction torque tester according to claim 1 is characterized by: The electric proportional valve (12) and the low friction cylinder are used for loading more than 10 kg Automatic loading under load, the cylinder used for loading is SMC's MQQT series low-friction cylinder, the cylinder diameter is 40mm, The stroke is 70mm.

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