High-speed precise bearing dynamic stiffness measuring device

Abstract

The utility model relates to a high-speed precise bearing dynamic stiffness measuring device, and belongs to the technical field of bearing dynamic stiffness measurement. A fixing plate of the device comprises a mounting ring and a base, the mounting ring is of an annular structure formed by combining an upper semicircular ring and a lower semicircular ring in a split mode, the lower semicircular ring is located at the top of the base and integrated with the base, and the mounting ring is arranged on a main connecting annular plate in a sleeving mode and clamps and fixes the main connecting annular plate through the mounting ring. The thrust electric cylinder is connected with the main connecting annular plate through a connecting plate; the front end of the thrust electric cylinder extends into an inner cavity of the main connecting annular plate, the spherical floating push head and the force measuring sensor are sequentially assembled at the front end of the thrust electric cylinder, and the bearing push plate is arranged between the floating push head and the test bearing on the rotating mandrel. The device is used for measuring the dynamic stiffness of the high-speed precise bearing, and can realize the measurement of the dynamic stiffness of the bearing in various coupling forms such as variable load, variable speed, constant load, constant speed and the like by controlling the rotating speed of the motor and the thrust of the thrust cylinder.

Description

Technical Field

[0001] The utility model relates to a high-speed precision bearing dynamic stiffness measuring device, belonging to the technical field of bearing dynamic stiffness measurement. Background Art

[0002] The dynamic stiffness of the bearing is one of the most critical performance parameters in the spindle system and directly affects the accuracy of the spindle system. Unlike the measurement of static stiffness, dynamic stiffness refers to the ability to resist dynamic displacement changes when subjected to alternating loads. Dynamic stiffness is the main indicator for measuring the vibration resistance of the structure. Therefore, studying the dynamic stiffness test of the bearing is more important for accurately obtaining the dynamic characteristics of the spindle bearing system. For the spindle-bearing joint, the dynamic stiffness is affected by many factors, such as bearing preload, bearing pairing method, the matching method between the bearing and the spindle, the spindle rotation speed, the bearing temperature rise, etc. Therefore, using a test device to study the change law of the bearing dynamic stiffness under different combinations of bearing preload and bearing speed is of great significance to the study of bearing performance.

[0003] At present, the devices used to study the dynamic stiffness of bearings are all low-speed devices, and most of the devices used to measure the dynamic stiffness of bearings are non-contact devices. Utility Model Content

[0004] The purpose of this utility model is to provide a high-speed precision bearing dynamic stiffness measuring device, which is used to measure the dynamic stiffness of high-speed precision bearings. By controlling the motor speed and the thrust of the thrust cylinder, the dynamic stiffness of the bearing can be measured under various coupling forms such as variable load, variable speed, fixed load, and fixed speed.

[0005] The technical solution of this utility model is:

[0006] A high-speed precision bearing dynamic stiffness measuring device, the fixed plate of the device includes a mounting ring and a base, the mounting ring is an annular structure composed of an upper semicircular ring and a lower semicircular ring, the lower semicircular ring is located on the top of the base and is integrated with the base, the mounting ring is sleeved on the main connecting annular plate and the main connecting annular plate is clamped and fixed by the mounting ring, a motor blocking plate is installed at one end of the electromagnetic motor housing, the other end of the electromagnetic motor housing is fixed to one end of the main connecting annular plate by a flange, a connecting plate is installed at the other end of the main connecting annular plate, and a thrust electric cylinder is connected to the main connecting annular plate through the connecting plate; the front end of the thrust electric cylinder extends to the inner cavity of the main connecting annular plate, the spherical floating push head and the force sensor are assembled at the front end of the thrust electric cylinder in sequence, and a bearing push plate is arranged between the floating push head and the test bearing on the rotating core shaft.

[0007] The high-speed precision bearing dynamic stiffness measuring device has a concave bearing push plate. A positioning hole corresponding to a floating push head is provided at the center of the bottom surface of the concave structure of the bearing push plate. The end face of the concave structure of the bearing push plate corresponds to the end face of the test bearing. The floating push head is pushed into contact with the bearing push plate by a thrust electric cylinder and applies thrust to the test bearing.

[0008] The high-speed precision bearing dynamic stiffness measuring device is provided with three contact displacement sensors on the connecting plate. The three contact displacement sensors are evenly distributed along the circumference of the bearing. The contact displacement sensors are in contact with the outer ring of the test bearing, and the dynamic stiffness change of the test bearing is measured by the contact displacement sensors.

[0009] In the high-speed precision bearing dynamic stiffness measuring device, the base of the fixed plate is fixedly mounted on the anti-vibration plate, and the anti-vibration plate is assembled on the top of the mounting frame.

[0010] The high-speed precision bearing dynamic stiffness measuring device is characterized in that the electromagnetic motor housing and the inner wall of the main connecting annular plate together form the inner cavity of the electromagnetic motor. A horizontal rotating core shaft is provided in the inner cavity. The rotating core shaft is located on the side of the inner cavity of the electromagnetic motor housing and is used to install the motor stator and motor rotor. The rotating core shaft is located on the side of the inner cavity of the main connecting annular plate and is used to install two sets of test bearings. A bearing partition is provided between the two sets of test bearings.

[0011] In the high-speed precision bearing dynamic stiffness measuring device, the test bearing is assembled on a rotating core shaft, and the driving form of the rotating core shaft is electromagnetic drive.

[0012] The design idea of ​​this utility model is:

[0013] The bearing of the utility model is driven by an electromagnetic motor to rotate the rotor, thereby driving the bearing to rotate at high speed. The electromagnetic motor is fixed at one end of the test bearing. Being arranged away from the test bearing can reduce the impact of the electromagnetic motor's rotation and heat on the test. One group of bearings is supported by a rigid flange, and the other group of bearings is supported by an electric loading device, and thrust is applied as needed. The displacement sensor is in contact with the outer ring of the bearing for measurement. The three displacement sensors are evenly distributed along the circumference of the bearing. The three displacement sensors monitor the stiffness of the outer ring of the bearing in real time, and the average value is taken during operation to make the test results more accurate. When conducting the test, the speed curve parameters and thrust curve parameters are set according to the test conditions to realize the dynamic stiffness measurement of the bearing under variable load, variable speed, constant load and constant speed conditions.

[0014] The advantages and beneficial effects of the present invention are:

[0015] (1) The device of this utility model can ensure the dynamic stiffness measurement of bearings in various coupling modes such as variable load, variable speed, fixed load, and fixed speed;

[0016] (2) The utility model uses a contact displacement sensor to measure bearing displacement, which has better accuracy;

[0017] (3) The utility model is designed to place the electromagnetic motor away from the bearing to reduce the influence of motor heating on the bearing stiffness measurement results. The deformation of two groups of bearings is measured each time to amplify the test results and improve the test accuracy.

[0018] (4) Under electromagnetic drive, the rotating core shaft speed can reach 30,000 r / min, providing a stable speed for testing.

[0019] (5) The device of the utility model is driven by an electric cylinder to push the force sensor and the bearing push plate forward. After the bearing push plate contacts the bearing, the pressure is fed back. According to the bearing working condition and bearing model, the relevant parameters such as the loading curve and the speed curve are set. The following four methods can be used for testing: constant thrust and constant speed for bearing dynamic stiffness test; variable load thrust and constant speed for bearing dynamic stiffness test; constant thrust and variable speed for bearing dynamic stiffness test; variable load thrust and variable speed for bearing dynamic stiffness test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1-Figure 2 This is the structural design diagram of the utility model. Figure 1 For axonometric drawing, Figure 2 It is a cross-sectional view.

[0021] The accompanying drawings are marked as follows: 1. Mounting frame, 2. Anti-vibration plate, 3. Electromagnetic motor housing, 4. Fixed plate (401 mounting ring, 402 base), 5. Connecting plate, 6. Thrust electric cylinder, 7. Contact displacement sensor, 8. Motor blocking plate, 9. Motor stator, 10. Motor rotor, 11. Test bearing, 12. Bearing push plate (1201 positioning hole), 13. Floating push head, 14. Force sensor, 15. Bearing partition, 16. Main connecting annular plate, 17. Rotating core shaft. DETAILED DESCRIPTION

[0022] like Figure 1-Figure 2 As shown, the utility model proposes a high-speed precision bearing dynamic stiffness measuring device, which mainly includes a mounting frame 1, an anti-vibration plate 2, an electromagnetic motor housing 3, a fixing plate 4, a connecting plate 5, a thrust electric cylinder 6, a contact displacement sensor 7, a motor blocking plate 8, a motor stator 9, a motor rotor 10, a test bearing 11, a bearing push plate 12, a floating push head 13, a force sensor 14, a bearing partition 15, a main connecting annular plate 16, a rotating core shaft 17, etc. The specific structure is as follows:

[0023] An anti-vibration plate 2 is installed on the top of the mounting frame 1. The anti-vibration plate 2 is used to prevent the vibration of the device from interfering with the vibration of the ground. The fixed plate 4 includes a mounting ring 401 and a base 402. The mounting ring 401 is an annular structure composed of an upper semicircular ring and a lower semicircular ring. The lower semicircular ring is located on the top of the base 402 and is integrated with the base 402. The anti-vibration plate 2 is designed with mounting holes and is fixed to the base 402 of the fixed plate 4. The mounting ring 401 is sleeved on the main connecting annular plate 16 and is clamped and fixed by the mounting ring 401. A motor blocking plate 8 is installed at one end of the electromagnetic motor housing 3. The other end of the electromagnetic motor housing 3 is fixed to one end of the main connecting annular plate 16 by a flange. The other end of the main connecting annular plate 16 is installed with a connecting plate 5. The thrust electric cylinder 6 is connected to the main connecting annular plate 16 via the connecting plate 5.

[0024] The electromagnetic motor housing 3 and the inner wall of the main connecting annular plate 16 together form the inner cavity of the electromagnetic motor, and a horizontal rotating core shaft 17 is provided in the inner cavity. The rotating core shaft 17 is located on the side of the inner cavity of the electromagnetic motor housing 3 and the motor stator 9 and the motor rotor 10 are installed. The rotating core shaft 17 is located on the side of the inner cavity of the main connecting annular plate 16 and two sets of test bearings 11 are installed. A bearing partition 15 is provided between the two sets of test bearings 11; the front end of the thrust electric cylinder 6 extends to the inner cavity of the main connecting annular plate 16, and the spherical floating push head 13 and the force sensor 14 are assembled in sequence on the thrust At the front end of the electric cylinder 6, a concave-structured bearing push plate 12 is provided between the floating push head 13 and the test bearing 11. A positioning hole 1201 corresponding to the floating push head 13 is provided at the center of the bottom surface of the concave structure of the bearing push plate 12. A portion of the front end of the floating push head 13 is embedded in the positioning hole 1201. The concave structure end face of the bearing push plate 12 corresponds to the end face of the test bearing 11. The floating push head 13 is pushed into contact with the bearing push plate 12 by the thrust electric cylinder 6 and applies thrust to the test bearing 11. The applied thrust value is fed back in real time by the force sensor 14. In addition, three contact displacement sensors 7 are provided on the connecting plate 5. The three contact displacement sensors 7 are evenly distributed along the circumference of the bearing. The contact displacement sensors 7 are in contact with the outer ring of the test bearing 11. The contact displacement sensors 7 can measure the changes in the dynamic stiffness of the two groups of bearings, amplify the measurement results, and make the measurement results more accurate.

[0025] In the present invention, the test bearing 11 is assembled on a rotating mandrel 17. The driving form of the rotating mandrel 17 is electromagnetic drive. The test bearing is arranged away from the electromagnetic motor, thereby avoiding the influence of electromagnetic motor heating on the stiffness measurement results, making it easier to achieve bearing stiffness testing. The two groups of test bearings 11 are separated by a bearing partition 15. The motor rotor 10 is welded to the rotating mandrel 17. The test bearing 11 is driven by the electromagnetic motor to rotate the motor rotor 10, thereby driving the test bearing 11 to rotate at high speed. The rotating mandrel 17 is controlled by the speed curve. By coordinating the thrust curve and the speed curve, the dynamic stiffness test of the device under multiple coupling conditions of variable speed, variable load, constant speed, and constant load is achieved.

[0026] Test results show that the electromagnetic motor-based bearing arrangement and electric cylinder loading enable dynamic stiffness measurement of bearings under variable load, variable speed, constant load, and constant speed conditions. A bearing displacement measurement device measures the displacement of the bearing outer ring under load, thereby calculating the bearing's dynamic stiffness. This device utilizes high-frequency sampling to provide real-time feedback on bearing displacement changes. This measurement device utilizes a contact-based measurement system, which offers higher repeatability than non-contact measurement devices.

Claims

1. A high-speed precision bearing dynamic stiffness measuring device, characterized in that: The fixed plate of the device includes a mounting ring and a base. The mounting ring is an annular structure composed of an upper semicircular ring and a lower semicircular ring. The lower semicircular ring is located on the top of the base and is integrated with the base. The mounting ring is sleeved on the main connecting annular plate and the main connecting annular plate is clamped and fixed by the mounting ring. A motor blocking plate is installed at one end of the electromagnetic motor housing, and the other end of the electromagnetic motor housing is fixed to one end of the main connecting annular plate through a flange. A connecting plate is installed at the other end of the main connecting annular plate, and the thrust electric cylinder is connected to the main connecting annular plate through the connecting plate; the front end of the thrust electric cylinder extends to the inner cavity of the main connecting annular plate, and the spherical floating push head and the force sensor are assembled at the front end of the thrust electric cylinder in sequence, and a bearing push plate is arranged between the floating push head and the test bearing on the rotating core shaft.

2. The high-speed precision bearing dynamic stiffness measuring device according to claim 1, characterized in that: The bearing push plate has a concave structure. A positioning hole corresponding to the floating push head is provided at the center of the bottom surface of the concave structure of the bearing push plate. The end face of the concave structure of the bearing push plate corresponds to the end face of the test bearing. The floating push head is pushed by the thrust electric cylinder to contact the bearing push plate and apply thrust to the test bearing.

3. The high-speed precision bearing dynamic stiffness measuring device according to claim 1, characterized in that: Three contact displacement sensors are installed on the connecting plate. The three contact displacement sensors are evenly distributed along the circumference of the bearing. The contact displacement sensors are in contact with the outer ring of the test bearing, and the dynamic stiffness change of the test bearing is measured by the contact displacement sensors.

4. The high-speed precision bearing dynamic stiffness measuring device according to claim 1, characterized in that: The base of the fixing plate is fixed on the anti-vibration plate, and the anti-vibration plate is assembled on the top of the mounting frame.

5. The high-speed precision bearing dynamic stiffness measuring device according to claim 1, characterized in that: The electromagnetic motor housing and the inner wall of the main connecting annular plate together form the inner cavity of the electromagnetic motor. A horizontal rotating core shaft is provided in the inner cavity. The rotating core shaft is located on the side of the inner cavity of the electromagnetic motor housing and is installed with a motor stator and a motor rotor. The rotating core shaft is located on the side of the inner cavity of the main connecting annular plate and is installed with two sets of test bearings. A bearing partition is provided between the two sets of test bearings.

6. The high-speed precision bearing dynamic stiffness measuring device according to claim 1, characterized in that: The test bearing is assembled on a rotating core shaft, and the driving form of the rotating core shaft is electromagnetic drive.

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