A radial air bearing performance test device

Abstract

The utility model discloses a radial air bearing performance test device, which generally includes: a power module, a support module, and a detection module, wherein the rotating component of the power module is a permanent magnet synchronous motor, which drives the step shaft to rotate through a coupling connection, thereby realizing the detection of the dynamic performance of the air bearing; the support module is responsible for realizing the fixation of devices such as stepper motors and sensors; the detection module detects the friction torque, vibration frequency, vibration amplitude, temperature and other information generated by the air bearing during high-speed rotation, and can also complete the static stiffness measurement of the bearing. The utility model solves the problems of poor fixation and poor versatility of air bearings during detection of existing devices. The designed detection module can meet the detection of information such as friction torque, vibration frequency, offset amplitude, temperature gradient and the like during the rotation of the air bearing, and can also complete the static stiffness test of the bearing, thereby improving the accuracy and efficiency of air bearing detection.

Description

Technical Field

[0001] The utility model relates to the technical field of radial air bearing performance detection, in particular to a test device for detecting the static stiffness of an air bearing, the friction torque, vibration, displacement and temperature during operation. Background Art

[0002] Air bearings, also known as air bearings, refer to bearing components that use gas (nitrogen, rare gas, air, etc.) as lubricants. Air bearings are generally divided into two categories according to the load direction: radial bearings and thrust bearings. The utility model is suitable for the detection of radial air bearings. As a relatively new mechanical load-bearing component, air bearings have distinct advantages and disadvantages.

[0003] advantage:

[0004] 1. With the characteristics of low friction and no wear, the air bearing uses gas as lubricating material, so it has an extremely low friction coefficient, which extends the service life of the bearing;

[0005] 2. With high speed, the use of gas lubrication allows the air bearing to be subject to less resistance while rotating. The speed of the shaft rotor it carries is usually above 90,000RPM;

[0006] 3. It has higher precision. Due to the uniform distribution of gas film, there is no contact between the bearing and the shaft during operation, thus reducing the instability of eccentric motion.

[0007] shortcoming:

[0008] 1. Since air bearings use gas as lubricant, their load-bearing capacity is lower than that of other bearings.

[0009] 2. The stability is weak. Due to the low viscosity of the gas, the system damping is low, which is not conducive to the dynamic stability of the bearing. Air hammer vibration or vortex is prone to occur during high-speed operation.

[0010] At present, most of the testing of air bearings is done by third parties, and a test report is issued. This is a considerable expense for manufacturers who need to test the performance of air bearings in large quantities. Therefore, it is urgent to design a test platform that can comprehensively test stiffness, vibration, friction torque, offset, temperature and other functions. By consulting relevant materials, the following problems exist:

[0011] Existing testing equipment has poor fixing stability for the air bearing to be tested, and may even cause the workpiece to detach, and cannot effectively test air bearings of different sizes; traditional test devices have poor accuracy in detecting friction torque, and their structures are relatively complex. Most of the detection methods only test a single attribute, and there are few comprehensive test devices for air bearings. Utility Model Content

[0012] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a radial air bearing performance test device. Through a specific structural design, tension and compression sensors, pressure sensors, acceleration sensors, displacement sensors, and thermocouples are distributed in appropriate positions of the test device. The stepped shaft installed inside the air bearing is rotated at high speed through motor transmission, thereby analyzing various performance parameters of the air bearing.

[0013] In order to achieve the above purpose, the utility model discloses the following technical solutions:

[0014] A radial air bearing performance test device, comprising a power module and a detection module arranged on a support module, wherein the rotating component of the power module is a permanent magnet synchronous motor, which drives the step shaft to rotate through a coupling connection; the support module comprises: a permanent magnet synchronous motor bracket for fixing the permanent magnet synchronous motor, an L-shaped bearing support seat, a displacement sensor Z-direction fixing frame, a sensor mounting plate, a friction torque sensor fixing block, a displacement sensor Y-direction fixing frame, a displacement sensor X-direction fixing frame, a stepping motor horizontal mounting plate, and a radial support bearing; the detection module comprises: a bearing mounting sleeve, a Y-direction displacement sensor Sensor, X-axis displacement sensor, stepper motor, sensor-stepper motor connector, pressure sensor, air bearing to be tested, Z-axis displacement sensor, tension and compression sensor, friction torque transmission plate; the openings at both ends of the bearing mounting sleeve are of different sizes, an inner hole is opened on the inner side of the small port, the inner hole is connected to the air bearing through an elastic pin key, and the circumferential rotation of the air bearing is limited. The large port is convenient for the installation of the air bearing, and a concave rail is opened on the inner side of the large port to place a bearing retaining ring and an elastic retaining ring. The large and small ports jointly limit the axial displacement of the air bearing and the bearing foil, and the lower end hole of the bearing mounting sleeve is connected to the friction torque transmission column.

[0015] Furthermore, the air bearing to be tested is placed in a bearing mounting sleeve, and an acceleration sensor and a thermocouple are adhered to the outer peripheral side of the air bearing.

[0016] Furthermore, the stepped shaft is supported by two pairs of L-shaped bearing support seats and radial support bearings. The internal structure of the L-shaped bearing support seat is similar to the bearing mounting sleeve structure, and the axial displacement and circumferential rotation of the radial support bearing are also limited by bearing retaining rings, elastic retaining rings, and elastic pin keys.

[0017] Furthermore, the stepper motor is placed at the center of the stepper motor horizontal mounting plate with the motor end facing downward, and the sensor-stepper motor connector and the pressure sensor are connected by bolts.

[0018] Furthermore, the friction torque transfer column is placed vertically, and the friction torque transfer plate is placed horizontally, and the two are fixed by bolts with an angle of 90°. A tension and compression sensor is placed at the end of the friction torque transfer plate, and one end of the tension and compression sensor is fixed to the sensor mounting plate.

[0019] Furthermore, the X-axis displacement sensor, the Y-axis displacement sensor, and the Z-axis displacement sensor are respectively connected to the displacement sensor X-axis fixing frame, the displacement sensor Y-axis fixing frame, and the displacement sensor Z-axis fixing frame through threads.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. The utility model has a simple and clear structure, is easy to install, and has strong system stability. For example, the opening diameters of the two end faces of the designed bearing mounting sleeve are different, which is convenient for the installation and axial fixation of the air bearing to be tested. The small port of the bearing mounting sleeve is provided with a pin hole, which is fixed with the air bearing by a pin to limit the circumferential rotation of the air bearing. To test air bearings of different models and sizes, it is only necessary to replace the matching bearing mounting sleeve.

[0022] 2. The test device of the utility model is equipped with acceleration sensors, displacement sensors, tension and compression sensors, and thermocouples, which can simultaneously detect the vibration frequency, offset amplitude, friction torque, temperature and other data information during the high-speed rotation of the air bearing. The detection devices between the test platforms do not interfere with each other and are easy to disassemble, which improves the efficiency and accuracy of testing the air bearing;

[0023] 3. In view of the friction torque that is difficult to detect, the utility model cleverly designs a combination of a friction torque transmission column, a transmission plate and a sensor, which has a simple structure and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a half-section schematic diagram of the overall structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the power module of the utility model;

[0027] Figure 4 This is the bearing installation sleeve and bearing assembly drawing of the utility model;

[0028] Figure 5 It is a side sectional view of the bearing mounting sleeve and the bearing assembly of the utility model;

[0029] Figure 6 This is a schematic diagram of the detection module of the utility model

[0030] In the figure: 1-1 permanent magnet synchronous motor, 1-2 coupling, 1-3 step shaft 1, 1-4 step shaft 2, 2-1 platform mounting plate, 2-2 permanent magnet synchronous motor bracket, 2-3 L-type bearing support seat, 2-4 displacement sensor Z-direction fixing frame, 2-5 sensor mounting plate, 2-6 friction torque sensor fixing block, 2-7 displacement sensor Y-direction fixing frame, 2-8 displacement sensor X-direction fixing frame, 2-9 L-type support cover plate, 2-10 stepper motor vertical mounting plate, 2-11 stepper motor horizontal mounting plate, 2-12 radial support shaft Bearing, 3-1 Friction torque transmission column, 3-2 Bearing mounting sleeve, 3-2-1 Mounting sleeve inner hole, 3-2-2 Concave rail, 3-3 Y displacement sensor, 3-4 X displacement sensor, 3-5 Stepper motor, 3-6 Sensor-stepper motor connector, 3-7 Pressure sensor, 3-8 Air bearing to be tested, 3-9 Z displacement sensor, 3-10 Tension and compression sensor, 3-11 Friction torque transmission plate, 3-12 Acceleration sensor, 3-13 Elastic pin key, 3-14 Bearing retaining ring, 3-15 Elastic retaining ring, 3-16 Thermocouple DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, and the directional words such as up, down, left, and right mentioned in the text are limited to the positional relationship of the devices in the drawings. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0033] Refer to the attached Figure 1-6 , an air bearing performance test device provided by the utility model is given, which mainly includes three parts: a power module, a support module, and a detection module, wherein the rotating part of the power module is a permanent magnet synchronous motor, which drives the step shaft to rotate through a coupling connection, thereby realizing the dynamic performance detection of the air bearing, and the static stiffness detection of the air bearing can also be realized when the step shaft is in a static load state; the support module is responsible for fixing devices such as stepper motors and sensors, and the detection module detects the friction torque, vibration frequency, vibration amplitude, temperature and other information generated by the air bearing during operation. The three major features of the test device are:

[0034] The power module comprises: a permanent magnet synchronous motor 1-1, a coupling 1-2, a stepped rotating shaft 1 (1-3), and a stepped rotating shaft 2 (1-4);

[0035] The support module includes: a platform mounting plate 2-1, a permanent magnet synchronous motor bracket 2-2, an L-shaped bearing support seat 2-3, a displacement sensor Z-direction fixing frame 2-4, a sensor mounting plate 2-5, a friction torque sensor fixing block 2-6, a displacement sensor Y-direction fixing frame 2-7, a displacement sensor X-direction fixing frame 2-8, an L-shaped support cover plate 2-9, a stepper motor vertical mounting plate 2-10, a stepper motor horizontal mounting plate 2-11, and a radial support bearing 2-12;

[0036] The detection module includes: a friction torque transmission column 3-1, a bearing mounting sleeve 3-2, an inner hole of the mounting sleeve 3-2-1, a concave rail 3-2-2, a Y-direction displacement sensor 3-3, an X-direction displacement sensor 3-4, a stepper motor 3-5, a sensor-stepper motor connector 3-6, a pressure sensor 3-7, an air bearing to be tested 3-8, a Z-direction displacement sensor 3-9, a tension and compression sensor 3-10, a friction torque transmission plate 3-11, an acceleration sensor 3-12, an elastic pin key 3-13, a bearing retaining ring 3-14, an elastic retaining ring 3-15, and a thermocouple 3-16;

[0037] Most of the components in the power module, support module and detection module are connected by M8 bolts, and a small number are connected by M6, M5 and M4 bolts;

[0038] refer to Figure 4 , Figure 5 The openings at both ends of the bearing mounting sleeve 3-2 are of different sizes. An inner hole is opened on the inner side of the small port, and the inner hole is connected to the air bearing through an elastic pin key to limit the circumferential rotation of the air bearing. The large port is convenient for the installation of the air bearing, and a concave track 3-2-2 is opened on the inner side of the large port to place the bearing retaining ring 3-14 and the elastic retaining ring 3-15. The large and small ports jointly limit the axial displacement of the air bearing and the bearing foil. The lower end hole of the bearing mounting sleeve is connected to the friction torque transmission column 3-1. In addition, two through holes with a diameter of 2 mm are opened at the small port of the bearing mounting sleeve 3-2 to facilitate the removal of the air bearing after testing.

[0039] With the above solution, the air bearing 3-8 is placed in the bearing mounting sleeve 3-2, and an acceleration sensor and a thermocouple are attached to the outer peripheral side of the air bearing to detect the vibration frequency signal and temperature gradient generated during the operation of the air bearing;

[0040] The stepped shaft is supported by two pairs of L-shaped bearing support seats 2-3 and radial support bearings 2-12. The internal structure of the L-shaped bearing support seat 2-3 is similar to the structure of the bearing mounting sleeve, and the axial displacement and axial rotation of the radial support bearing 2-12 are also limited by the bearing retaining ring 3-14, the elastic retaining ring 3-15, and the elastic pin key 3-13.

[0041] The stepper motor 3-5 is placed at the center of the stepper motor horizontal mounting plate 2-11, with the motor end facing downward, and the sensor-stepper motor connector 3-6 and the pressure sensor 3-7 are connected by bolts to simulate the radial load of the air bearing, and the deformation data of the bearing can be obtained at the same time;

[0042] Reference Figure 1 , Figure 6 The friction torque transmission column 3-1 is placed vertically, and the friction torque transmission plate 3-11 is placed horizontally. The two are fixed by bolts with an angle of 90°. A tension and compression sensor 3-10 is placed at the end of the friction torque transmission plate 3-11, and one end of the tension and compression sensor 3-10 is fixed to the sensor mounting plate 2-5;

[0043] The X-axis displacement sensor 3-4, the Y-axis displacement sensor 3-3, and the Z-axis displacement sensor are respectively connected to the displacement sensor X-axis fixing frame 2-8, the displacement sensor Y-axis fixing frame 2-7, and the displacement sensor Z-axis fixing frame 2-4 through threads, and the lower end hole of the bearing mounting sleeve 3-2 is connected to the friction torque transmission column 3-1, the friction torque transmission plate 3-11, the tension and compression sensor 3-10, and the friction torque sensor fixing block in sequence;

[0044] During the dynamic operation of the air bearing, the rotation of the stepped shaft will drive the movement of the surrounding air, causing relative friction between the air and the bearing, and then generating torque, which causes the air bearing and the bearing mounting sleeve to jointly generate tiny vibrations, which are then transmitted in turn through the friction torque transfer column, the friction torque transfer plate, and finally the tension and compression sensor to detect the torque information.

[0045] The working principle of this utility model:

[0046] s1. Assembly of the detection device

[0047] s11. First, fix the platform mounting plate, and connect and fix the permanent magnet synchronous motor bracket, two L-shaped bearing support seats, and the sensor mounting plate on the mounting plate in sequence. Place two radial support bearings in the inner hole positions of the two L-shaped bearing support seats, respectively. Install the displacement sensor X-direction fixing frame and the displacement sensor Z-direction fixing frame in the middle position of the outer circumference of the two L-shaped bearing support seats, respectively. Install the L-shaped support cover plate, the stepper motor vertical mounting plate, and the stepper motor horizontal mounting plate on the upper ends of the two L-shaped bearing support seats, and install the displacement sensor Y-direction fixing frame on the sensor mounting plate;

[0048] s12. Next, install the air bearing device to be tested, put one end of the air bearing into the large port of the bearing mounting sleeve, and fix the air bearing and the bearing mounting sleeve by means of elastic pin keys to limit the rotation of the air bearing, and place a bearing retaining ring and an elastic retaining ring at the large port of the bearing mounting sleeve to limit the axial displacement of the air bearing and the bearing foil;

[0049] s13. Fix the permanent magnet synchronous motor on the permanent magnet synchronous motor bracket, connect one end to the coupling, step shaft 2, and step shaft 1, place the radial support bearing and the air bearing to be tested on the step shaft in sequence, and install the bearing retaining ring, elastic retaining ring, and elastic pin key on the inner holes of the two L-shaped bearing support seats respectively to limit the axial displacement and circumferential rotation of the radial support bearing, and fix the stepper motor on the stepper motor horizontal mounting plate;

[0050] s14. The lower end hole of the bearing mounting sleeve is connected to the friction torque transfer column, the friction torque transfer plate, the tension and compression sensor, and the friction torque sensor fixing block in sequence. The friction torque sensor fixing block is placed on the sensor mounting plate. The pressure sensor is placed on the end of the stepper motor. The X-axis displacement sensor, the Y-axis displacement sensor, and the Z-axis displacement sensor are respectively connected to the displacement sensor X-axis fixing frame, the displacement sensor Y-axis fixing frame, and the displacement sensor Z-axis fixing frame by bolts. The acceleration sensor and the thermocouple are pasted on the outer peripheral side of the air bearing to be tested.

[0051] s2. Function of each sensor

[0052] s21, friction torque sensor

[0053] The friction torque sensor is essentially a tension and compression sensor, model JTS-F01 S, which is used to measure the friction torque generated by the tiny vibration of the air bearing caused by the relative movement of air during high-speed operation of the air bearing. Its instantaneous value is expressed as

[0054] M (t) =F (t) ·L

[0055] Among them, M (t) is the instantaneous friction torque, F (t) is the instantaneous value of the tension and compression sensor, and L is the length of the force arm;

[0056] s22, displacement sensor

[0057] The displacement sensors include: X-axis displacement sensor, Y-axis displacement sensor, and Z-axis displacement sensor. All three are 5E101 eddy current displacement sensors, which are used to measure the displacement offset values ​​of the air bearing in the X, Y, and Z directions during high-speed rotation of the air bearing.

[0058] s23, acceleration sensor

[0059] 1A116E piezoelectric accelerometer is used to measure the amplitude, vibration frequency and other data information of air bearings during high-speed rotation;

[0060] s24, pressure sensor

[0061] The pressure sensor model is JTY-Z03, with a measuring range of 50kg. It is placed at the end of the stepper motor. When needed, the stepper motor drives the pressure sensor downward to make it contact with the bearing mounting sleeve and apply pressure to detect the deformation of the air bearing when it is subjected to radial static load.

[0062] s3. Data processing and performance evaluation

[0063] s31, transmitting the data collected by the sensors in each step of s2 to the computer, and making corresponding curves, charts, etc.;

[0064] s32. Evaluate the measured air bearing data based on the specific research topic and use it as a reference for subsequent research.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A radial air bearing performance test device, characterized in that: It includes a power module and a detection module arranged on the support module, wherein the rotating component of the power module is a permanent magnet synchronous motor, which drives the stepped shaft to rotate through a coupling connection; The support module includes: a permanent magnet synchronous motor bracket for fixing the permanent magnet synchronous motor, an L-shaped bearing support seat, a displacement sensor Z-direction fixing frame, a sensor mounting plate, a friction torque sensor fixing block, a displacement sensor Y-direction fixing frame, a displacement sensor X-direction fixing frame, a stepper motor horizontal mounting plate, and a radial support bearing; The detection module includes: a bearing mounting sleeve, a Y-axis displacement sensor, an X-axis displacement sensor, a stepper motor, a sensor-stepper motor connector, a pressure sensor, an air bearing to be tested, a Z-axis displacement sensor, a tension and compression sensor, and a friction torque transmission plate; the openings at both ends of the bearing mounting sleeve are of different sizes, an inner hole is opened on the inner side of the small port, the inner hole is connected to the air bearing through an elastic pin key, and the circumferential rotation of the air bearing is limited, the large port is convenient for the installation of the air bearing, and a concave track is opened on the inner side of the large port to place a bearing retaining ring and an elastic retaining ring, the large and small ports jointly limit the axial displacement of the air bearing and the bearing foil, and the lower end hole of the bearing mounting sleeve is connected to the friction torque transmission column.

2. A radial air bearing performance test device according to claim 1, characterized in that: The air bearing to be tested is placed in a bearing mounting sleeve, and an acceleration sensor and a thermocouple are adhered to the outer peripheral side of the air bearing.

3. A radial air bearing performance test device according to claim 1, characterized in that: The stepped shaft is supported by two pairs of L-shaped bearing support seats and radial support bearings. The internal structure of the L-shaped bearing support seat is similar to the structure of the bearing mounting sleeve, and the axial displacement and circumferential rotation of the radial support bearing are also limited by bearing retaining rings, elastic retaining rings, and elastic pin keys.

4. A radial air bearing performance test device according to claim 1, characterized in that: The stepper motor is placed at the center of the stepper motor horizontal mounting plate with the motor end facing downward, and the sensor-stepper motor connector and the pressure sensor are connected by bolts.

5. A radial air bearing performance test device according to claim 1, characterized in that: The friction torque transmission column is placed vertically, and the friction torque transmission plate is placed horizontally. The two are fixed by bolts with an angle of 90°. A tension and compression sensor is placed at the end of the friction torque transmission plate, and one end of the tension and compression sensor is fixed to the sensor mounting plate.

6. A radial air bearing performance test device according to claim 1, characterized in that: The X-axis displacement sensor, the Y-axis displacement sensor, and the Z-axis displacement sensor are respectively connected to the X-axis fixing frame of the displacement sensor, the Y-axis fixing frame of the displacement sensor, and the Z-axis fixing frame of the displacement sensor through threads.

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