CN113670615A - Bearing unit vibration testing method and system - Google Patents
Bearing unit vibration testing method and system Download PDFInfo
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Abstract
The invention provides a bearing unit vibration testing method and system, and belongs to the technical field of bearing detection. Carrying out vibration detection on a bearing unit to be detected to obtain a vibration signal of the bearing unit, converting the vibration signal into a digital signal, carrying out VMD decomposition on the digital signal to obtain a plurality of band-limited intrinsic mode functions, calculating power spectrum energy of each band-limited intrinsic mode function, and when the order of the band-limited intrinsic mode function with the maximum power spectrum energy is greater than a set order in each band-limited intrinsic mode function, determining that the bearing unit to be detected has a wear defect; or if one of the finite-band intrinsic mode functions has energy larger than a set threshold, the bearing unit to be tested has a wear defect. By adopting the invention, the bearing units can be detected rapidly in batches, and the detection time is reduced.
Description
Technical Field
The invention relates to a bearing unit vibration testing method and system, and belongs to the technical field of bearing detection.
Background
To obtain an inertia actuating mechanism of a spacecraft attitude control system with long service life and high performance, one of the key technologies is to obtain a bearing unit rotation support system with low friction wear and reliable operation. The bearing unit is lubricated by disposable thin oil and is free of maintenance throughout the life, the performance of an inertial execution mechanism of the spacecraft can be reduced due to tiny defects, and the task failure of the spacecraft can be caused in serious cases. The vibration can effectively reflect the comprehensive characteristics of the running of the bearing unit, is very sensitive to the early tiny defects of the bearing unit, can know and master the running state of the bearing unit through vibration information parameters under the condition that the bearing unit is not disassembled and shut down through a vibration test, judges the vibration performance of the bearing unit, determines whether the whole or part of the bearing unit is normal or not, finds the early defects, timely eliminates hidden dangers, and is beneficial to enhancing the reliability of the spacecraft.
However, the bearing unit of the spacecraft inertia actuating mechanism is used under low-speed and light-load conditions, the main failure mode is wear failure, and the vibration generated after the bearing surface is worn has the same property as the vibration of a normal bearing, namely, both the vibration are irregular and have strong randomness, so that the vibration performance of the early defects is greatly challenged.
For general application machinery, the bearing cannot be damaged immediately due to abrasion, and the damage degree of the bearing is far less than that of the surface damage defects, so at present, the research at home and abroad is mainly focused on the surface damage defects. However, for an inertial execution mechanism of a spacecraft, the abrasion defects directly determine the running power consumption and stability of equipment, and in severe cases, the attitude control system may fail to work, so that the whole satellite task fails.
Disclosure of Invention
The invention aims to provide a vibration testing method and system for a bearing unit, which are used for solving the problem that whether the bearing unit has a wear defect or not is difficult to judge.
In order to achieve the above object, the present invention provides a vibration testing method for a bearing unit, comprising the steps of:
1) acquiring a vibration signal when the bearing unit to be tested rotates, and converting the vibration signal into a digital signal;
2) carrying out variation modal decomposition on the digital signal to obtain a band-limited intrinsic mode function of a first set order;
3) calculating the power spectrum energy of the intrinsic mode function in each order of the order limit band;
4) if the order of the mode function in the limited band with the maximum power spectrum energy is larger than a second set order, the bearing unit to be tested has a wear defect; the second set order is smaller than the first set order; or if the power spectrum energy of the modal function in the limited band of a certain order is larger than a set threshold, the bearing unit to be tested has the abrasion defect.
The invention has the beneficial effects that: carrying out vibration detection on the bearing unit to be detected to obtain a vibration signal of the bearing unit to be detected, converting the vibration signal into a digital signal, carrying out VMD decomposition on the digital signal to obtain a first set order of band-limited intrinsic mode function (BIMF), calculating power spectrum energy of the modal function in each order of band-limited, and judging whether the bearing unit to be detected has wear defects according to the size and distribution of the power spectrum energy; if the order of the mode function in the limited band with the maximum power spectrum energy in the mode functions in the limited band with the first set order is larger than the second set order, the bearing unit to be tested has abrasion defects; the second set order should be less than the first set order; or, if one of the finite-band intrinsic mode functions of the first set order is larger than a set threshold, the bearing unit to be tested has a wear-type defect. By adopting the invention, the bearing units can be detected rapidly in batches, and the detection time is reduced.
Further, in the above method, the first setting order is 5 or 6, and the second setting order is 4.
And decomposing the vibration digital signal of the bearing unit to be tested into a BIMF component of 5 order or 6 order through VMD, wherein if the order of the BIMF component with the maximum power spectrum energy is greater than 4, the bearing unit to be tested has abrasion defects. When the bearing unit to be tested is tested, a person skilled in the art can decompose the digital signal of the vibration of the bearing unit to be tested into the BIMF components of more orders through the VMD, calculate the power spectrum energy of each order of the BIMF components, and judge according to the distribution and the size of the power spectrum energy of each order of the BIMF components.
Further, in the method, in step 2), the digital signal is subjected to filtering and noise reduction and then subjected to variational modal decomposition; the method for filtering and denoising the digital signal comprises the following steps: and eliminating interference signals with sampling frequency less than 50Hz and distortion signals with sampling frequency more than 10000 Hz.
Because the response frequency of the three-axis vibration sensor is 10000Hz, the acquired vibration signals above 10000Hz have distortion phenomenon, and the accuracy of the test can be improved by filtering and reducing noise.
Further, in the above method, in the step 4), the set threshold is 3000mv2-6000mv2。
If the power spectrum energy of the BIMF component with the maximum power spectrum energy is larger than a set threshold value, the bearing unit to be tested has abrasion defects; after the bearing unit to be tested is tested for multiple times, the range of the set threshold value is 3000mv2-6000mv2。
Further, in the above method, in step 3), the method for calculating the power spectrum energy of the implicit modal function in each order of the order band includes: carrying out power spectrum analysis on the band-limited intrinsic mode function of each order to obtain a power spectrum S (f) of the band-limited intrinsic mode function of each orderi) According to the formula
Calculating the power spectrum energy of the intrinsic mode function in each order of the order limit band; wherein E is the power spectrum energy of the intrinsic mode function corresponding to each order of the restricted band, i is a sampling point, i is more than or equal to 0 and less than or equal to n, n is the number of sampling points, fiIs the sampling frequency.
The invention also provides a bearing unit vibration testing system which comprises a bearing unit vibration testing device used for enabling the bearing unit to be tested to rotate and an upper computer connected with the bearing unit vibration testing device; and the upper computer executes instructions to realize the bearing unit vibration testing method.
Further, in the above system, the bearing unit vibration testing apparatus includes:
the vacuum box (2) is internally provided with an inner ring support shaft (20) and an outer ring support frame (31);
the inner ring supporting shaft (20) is used for fixedly assembling an inner ring of the bearing unit (9) to be detected;
the outer ring support frame (31) is used for fixedly assembling the outer ring of the detection unit to be detected;
one of the inner ring support shaft and the outer ring support frame (31) is a fixed part, the other one is a rotating part, the fixed part and the vacuum box (2) are relatively fixedly assembled, and the rotating part and the vacuum box (2) are relatively rotatably assembled;
the motor rotor (10) and the motor stator (11) which are matched for use are arranged in the vacuum box (2), the motor rotor (10) and the rotating piece are fixedly assembled to drive the rotating piece to rotate, the inner ring or the outer ring fixedly assembled with the rotating piece drives the rolling body of the bearing unit (9) to rotate, and then the rolling body applies vibration force to the outer ring or the inner ring fixedly assembled with the fixing piece;
the vibration sensor (7) is directly fixedly arranged on the fixed part or indirectly fixedly arranged on the fixed part through a rigid connecting piece (1) and is used for detecting the vibration condition of the outer ring or the inner ring fixedly assembled with the fixed part;
the upper computer is connected with a vibration sensor (7).
Forming a vacuum environment by using a vacuum box, fixedly assembling an inner ring of the bearing unit to be tested and an inner ring supporting shaft, fixedly assembling an outer ring of the bearing unit to be tested and an outer ring supporting frame, wherein, the inner ring supporting shaft or the outer ring supporting frame is a rotating part, when in use, the motor rotor drives the rotating part to rotate, the inner ring or the outer ring which is fixedly assembled with the rotating part drives the rolling body of the bearing unit to rotate, and then the rolling body applies vibration force to the outer ring or the inner ring fixedly assembled with the fixed part, and the vibration sensor detects the vibration performance of the fixed part, thereby not only forming a vacuum working environment by using the vacuum box, moreover, the vibration sensor is directly or indirectly and fixedly assembled on the fixing piece, so that the vibration condition of the corresponding outer ring or inner ring fixedly assembled on the fixing piece can be accurately reflected, and the vibration performance of the bearing unit in a vacuum environment can be accurately measured.
Further, in the above system, an axis of the inner ring support shaft extends in an up-down direction; when the inner ring supporting shaft is used as the fixing piece and the vibration sensor (7) is indirectly arranged on the fixing piece through the rigid connecting piece (1), the rigid connecting piece (1) is arranged at the top of the inner ring supporting shaft; the rigid connecting piece (1) is a threaded connecting piece, the lower end of the threaded connecting piece is fixedly assembled with the inner ring supporting shaft through a threaded connecting structure, and the upper end of the threaded connecting piece is fixedly assembled with the vibration sensor (7) through the threaded connecting structure; the lower end of the threaded connecting piece is provided with a bottom threaded column (101) to be in threaded connection with an internal threaded hole at the top end of the inner ring supporting shaft, and the upper end of the threaded connecting piece is provided with a top threaded hole (102) to be fastened and assembled with the vibration sensor (7).
The rigid connecting piece adopts a threaded connecting piece, so that the vibration sensor is conveniently and rigidly and fixedly arranged on the inner ring supporting shaft; and the rigid connecting piece is arranged at the top of the inner ring support shaft, so that the installation and detection are convenient.
Further, in the system, the motor rotor (10) is coaxially sleeved outside the inner ring supporting shaft at intervals, the motor stator (11) is relatively and fixedly assembled in the vacuum box (2), the motor stator (11) is matched with the motor rotor (10) to ensure that the motor rotor (10) normally rotates, the motor stator (11) is in an annular interval, and the motor stator (11) is coaxially sleeved outside the inner ring supporting shaft at intervals.
Further, in the above system, the vacuum box (2) is supported and mounted on a vibration isolation platform (15); the vacuum box (2) comprises a supporting bottom plate and an opening box body which is arranged in an inverted buckle mode, the supporting bottom plate and the opening box body are assembled in a sealing mode, and a vacuumizing structure is arranged on the supporting bottom plate; the supporting base plate is further provided with an electric connector unit (13) in a centralized mode, the electric connector unit (13) is connected with a signal line (8) and a power supply line (12), the power supply line (12) supplies power to the motor stator (11) to drive the motor rotor (10) to rotate, and the signal line (8) is connected with the vibration sensor (7).
The vibration isolation platform is arranged, so that the interference of the external environment on the vacuum box is conveniently reduced, and the measurement precision is ensured; the electric connector units are arranged on the bottom plate in a centralized mode and used for configuring signal lines and power supply lines, power supply and signal connection are conveniently achieved, and leakage risks caused by too many openings are avoided.
Drawings
FIG. 1 is a schematic structural diagram of a vibration testing apparatus for a bearing unit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a vibration testing method of a bearing unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a vibration signal of a bearing unit under test according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of 5-order BIMF components of a vibration signal after VMD decomposition according to an embodiment of the present invention;
FIG. 5 is a schematic power spectrum energy diagram of each order BIMF component of a faultless bearing unit in an embodiment of the present invention;
FIG. 6 is a power spectral energy diagram of the BIMF components of each stage of a worn bearing unit in an embodiment of the present invention;
FIG. 7 is a schematic view of a bearing channel of a faultless bearing unit in an embodiment of the present invention;
FIG. 8 is a schematic view of a bearing channel of a wear bearing unit in an embodiment of the invention;
FIG. 9 is a schematic diagram of maximum power spectrum energy-BIMF order for 30 bearing unit tests according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating the maximum power spectrum energy of the 30 bearing units tested in the example of the present invention.
In figure 1, a rigid connecting piece; 101. a bottom threaded post; 102. a top threaded hole; 2. a vacuum box; 3. a rotor fastening screw; 31. an outer ring support frame; 4. a stator fastening screw; 5. a seal ring; 6. a vacuum valve; 7. a vibration sensor; 8. a signal line; 9. a bearing unit to be tested; 10. a motor rotor; 11. a motor stator; 12. a power supply line; 13. an electrical connector unit; 14. a support frame; 15. a vibration isolation platform; 16. a power source; 17. an A/D conversion device; 18. an upper computer; 19. a fixing plate; 20. the inner ring supports the shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The embodiment of the system is as follows:
the vibration testing system for the bearing unit comprises a vibration testing device for the bearing unit to be tested and an upper computer connected with the vibration testing device for the bearing unit to be tested, wherein the vibration testing device is used for enabling the bearing unit to be tested to rotate, the upper computer is used for collecting vibration information of the bearing unit to be tested through a vibration sensor, and data processing and analysis are carried out, so that the vibration testing method for the bearing unit is realized, and whether the bearing unit to be tested is abraded or not is judged.
The bearing unit 9 to be tested of the bearing unit vibration testing device in the embodiment comprises two bearings which are used in a matched mode, each bearing comprises a bearing inner ring and a bearing outer ring, an inner spacer ring is supported and arranged between the two bearing inner rings, an outer spacer ring is supported and arranged between the two bearing outer rings, during measurement, the inner rings and the inner spacer rings of the two bearings are fixedly sleeved on the inner ring supporting shaft 20 in a corresponding mode, pre-tightening fixing assembly is achieved, and meanwhile the outer rings and the outer spacer rings of the two bearings are fixedly installed on the outer ring supporting frame 31 in a corresponding mode.
The bearing unit vibration testing apparatus is provided therein with a vacuum box 2 for forming a vacuum environment. The vacuum box 2 comprises an opening box body arranged on a bottom plate and an inverted buckle, a sealing ring 5 is arranged at the butt joint of the opening box body and the bottom plate, and a vacuum valve 6 is arranged on the bottom plate and is used for being communicated with a vacuumizing air path to vacuumize the vacuum box 2. A fixing plate 19 is provided on the base plate, and an inner ring support shaft 20 is fixedly mounted on the fixing plate 19, and the inner ring support shaft 20 extends in the up-down direction. In order to improve the vibration measurement precision, the vacuum box 2 is fixedly arranged on the vibration isolation platform 15 through the supporting frame 14, and vibration interference caused by external vibration to the vacuum box 2 is reduced.
The motor stator 11 is fixedly assembled on the fixing plate 19 through the stator fastening bolt 4, the motor stator 11 is sleeved outside the inner ring supporting shaft in a clearance mode, the motor rotor 10 is assembled corresponding to the motor stator 11, the motor rotor 10 is also sleeved outside the inner ring supporting shaft in a clearance mode, the motor rotor 10 and the outer ring supporting frame 31 are fixedly assembled together through the rotor fastening bolts 3, and the outer ring supporting frame 31 is used for being fixedly assembled together with the outer ring of the bearing unit 9 to be tested.
In consideration of a vacuum environment, an electric connector unit 13 is arranged on the bottom plate in a centralized mode, a signal line 8 and a power supply line 12 are connected to the electric connector unit 13, the power supply line 12 supplies power to a motor stator 11 to drive a motor rotor 10 to rotate, the signal line 8 is connected with the vibration sensor 7, a part of the power supply line 12 is located in the vacuum box 2, a part of the power supply line 12 is located outside the vacuum box 2, the line located in the vacuum box 2 is electrically connected with the motor stator 11, and the line located outside the vacuum box is communicated with a power supply 16 to guarantee power supply. One part of the signal line 8 is also positioned in the vacuum box 2, the other part is positioned outside the vacuum box 2, the corresponding line positioned in the vacuum box 2 is connected with the vibration sensor 7, the corresponding line positioned outside the vacuum box 2 is connected with the A/D conversion equipment 17, and the A/D conversion equipment 17 is connected with the upper computer 18. The vibration signals collected by the vibration sensor 7 are converted into digital signals by the A/D conversion equipment 17, the digital signals are transmitted to the upper computer 18, and the upper computer 18 executes instructions to realize the vibration testing method of the bearing unit, so that whether the bearing unit 9 to be tested has abrasion defects or not is judged.
The vibration testing method of the bearing unit in the embodiment adopts the vibration testing device of the bearing unit, tests according to the flow shown in fig. 2, and comprises the following steps:
1) during testing, the bearing unit 9 to be tested, the motor rotor 10, the motor stator 11 and the like are correspondingly arranged in the vacuum box 2, and the three-shaft type vibration sensor is fixedly arranged at the top end of the inner ring supporting shaft through the rigid connecting piece 1. And then, carrying out vacuum pumping operation on the vacuum box 2 to ensure that the vacuum degree in the vacuum box 2 is less than 10Pa, supporting and mounting the vacuum box 2 after vacuum pumping on a vibration isolation platform 15, connecting a power supply 16 and an A/D conversion device 17, adjusting the rotating speed of the bearing unit 9 to be tested to a rated working rotating speed, and starting to collect vibration signals of the bearing unit 9 to be tested. The test time should be not less than 30 min.
When the vibration signal of the bearing unit 9 to be measured is collected by the three-axis type vibration sensor, the sampling frequency is 45KHz, the number of sampling points is 8192, and the collected vibration signal is shown in figure 3. The three-axis type vibration sensor converts the acquired vibration signal into a digital signal through the a/D conversion device 17, and transmits the digital signal to the upper computer 18.
2) The upper computer 18 receives the digital signal of the bearing unit 9 to be tested, and carries out filtering and noise reduction, wherein the filtering frequency is 50-10000 Hz. Because the response frequency of the used three-axis vibration sensor is 10000Hz, the collected vibration signals above 10000Hz have distortion phenomenon. Therefore, the filtering and noise reduction can effectively eliminate low-frequency (below 50 Hz) interference and high-frequency (above 10000 Hz) distortion signals.
3) And performing Variational Modal Decomposition (VMD) on the filtered and denoised digital signal, wherein the VMD is a non-recursive adaptive signal processing method and can decompose a complex signal into a series of modes so as to obtain a multi-order band-limited intrinsic mode function (BIMF). In this embodiment, VMD decomposition is performed on the digital signal to obtain a 5 th order BIMF component as shown in fig. 4.
4) For each of the abovePerforming power spectrum analysis on the order BIMF components to obtain power spectra S (f) of the corresponding order BIMF components in the frequency domaini)；
5) Power spectrum S (f) from each order of BIMF componentsi) Calculating the power spectrum energy of each order of BIMF component, wherein the discretization calculation formula is as follows:
wherein E is the power spectrum energy corresponding to each order of BIMF component, i is the sampling point, i is more than or equal to 0 and less than or equal to n, n is the number of sampling points, f isiIs the sampling frequency.
6) And judging the vibration performance of the bearing unit to be tested according to the power spectrum energy size and distribution of each order of BIMF components, thereby judging whether the bearing unit has a wear defect.
In this embodiment, the adopted vibration performance evaluation criteria of the bearing unit are as follows: in each step of BIMF components of vibration signals of the bearing unit to be tested, if the order of the BIMF component corresponding to the highest power spectrum energy is not less than 4 and the maximum value of the power spectrum energy is not less than 4000mv2Then the bearing unit to be tested has wear-type defects. That is, the vibration signal of the bearing unit to be tested is decomposed to obtain multi-order BIMF components, the order corresponding to the BIMF component with the highest power spectrum energy is greater than or equal to 4, and the power spectrum energy of the BIMF component is greater than or equal to 4000mv2And judging that the bearing unit to be tested has the abrasion defect fault.
Taking the 5-order BIMF component obtained in this embodiment as an example, if the power spectrum energy distribution and magnitude of each order BIMF component of the bearing unit to be tested are as shown in fig. 5, the power spectrum energy of the corresponding each order BIMF component is mainly distributed in the 3-order BIMF component, and the power spectrum energy is not greater than 4000mv2And judging that the bearing unit to be tested does not have the abrasion defects. The bearing unit to be tested is disassembled, and the bearing channel is inspected under a 20-time microscope, as shown in fig. 7, the color of the bearing channel of the bearing unit to be tested is uniform, which indicates that the bearing unit to be tested does not have abrasion defects.
If it is waiting forThe power spectrum energy distribution and size of each order of BIMF component of the bearing unit are shown in FIG. 6, the power spectrum energy of the corresponding each order of BIMF component is mainly distributed in the 4 order of BIMF component, and the power spectrum energy is more than 4000mv2And judging that the bearing unit to be tested has the abrasion defects. The bearing unit to be tested is disassembled, and the bearing channel is inspected under a 20-time microscope, as shown in fig. 8, it can be seen that the color of the bearing channel of the bearing unit to be tested is not uniform, and obvious color anomaly of a channel running-in belt exists, which indicates that the bearing unit to be tested really has abrasion defects.
In order to further verify the present invention, in this embodiment, the vibration testing apparatus and the vibration testing method for bearing units are further adopted to perform vibration testing on 30 bearing units, where bearing units No. 1-10 are non-faulty bearing units, and bearing units No. 11-30 are bearing units with wear-type defects. The vibration signal of the 30 bearing units is collected by adopting the bearing unit vibration testing device, the vibration signal of each bearing unit is processed and analyzed by the upper computer according to the bearing unit vibration testing method, and the energy size and distribution of each-order BIMF power spectrum of each bearing unit are counted.
As shown in FIG. 9 and FIG. 10, the power spectrum energy of the vibration signals of bearing units No. 1-10 is mainly located in the BIMF component of 1-3 orders, and the maximum power spectrum energy does not exceed 4000mv2The power spectrum energy of vibration signals of bearing units No. 11-30 is mainly positioned in BIMF component with the order of no less than 3, and the power spectrum energy is not less than 4000mv2. The test result shows that the bearing unit testing method can accurately judge whether the bearing unit is abraded or not.
The method comprises the following steps:
the vibration testing method of the bearing unit in the embodiment of the system is adopted, and the vibration testing method of the bearing unit in the embodiment of the system is already described in the embodiment of the system and is clearly understood, so that the vibration testing method is not repeated.
Claims (10)
1. A vibration testing method for a bearing unit is characterized by comprising the following steps:
1) acquiring a vibration signal when the bearing unit to be tested rotates, and converting the vibration signal into a digital signal;
2) carrying out variation modal decomposition on the digital signal to obtain a band-limited intrinsic mode function of a first set order;
3) calculating the power spectrum energy of the intrinsic mode function in each order of the order limit band;
4) if the order of the mode function in the limited band with the maximum power spectrum energy is larger than a second set order, the bearing unit to be tested has a wear defect; the second set order is smaller than the first set order; or if the power spectrum energy of the modal function in the limited band of a certain order is larger than a set threshold, the bearing unit to be tested has the abrasion defect.
2. The bearing unit vibration testing method according to claim 1, wherein the first set order is 5 or 6 and the second set order is 4.
3. The method for testing the vibration of the bearing unit according to claim 1, wherein in the step 2), the variation modal decomposition is performed after the digital signal is filtered and denoised; the method for filtering and denoising the digital signal comprises the following steps: and eliminating interference signals with sampling frequency less than 50Hz and distortion signals with sampling frequency more than 10000 Hz.
4. The method for testing vibration of a bearing unit according to claim 1, wherein in step 4), the set threshold is 3000mv2-6000mv2。
5. The method for testing the vibration of the bearing unit according to claim 1, wherein in the step 3), the method for calculating the power spectrum energy of the intrinsic mode function in each order of the order limit band comprises the following steps: carrying out power spectrum analysis on the band-limited intrinsic mode function of each order to obtain a power spectrum S (f) of the band-limited intrinsic mode function of each orderi) According to the formula
Calculating the power spectrum energy of the intrinsic mode function in each order of the order limit band; wherein E is the power spectrum energy of the intrinsic mode function corresponding to each order of the restricted band, i is a sampling point, i is more than or equal to 0 and less than or equal to n, n is the number of sampling points, fiIs the sampling frequency.
6. A vibration test system for a bearing unit is characterized by comprising a bearing unit vibration test device for enabling the bearing unit to be tested to rotate and an upper computer connected with the bearing unit vibration test device; the upper computer executes instructions to realize the bearing unit vibration testing method of any one of claims 1-5.
7. The bearing unit vibration testing system of claim 6, wherein said bearing unit vibration testing apparatus comprises:
the vacuum box (2) is internally provided with an inner ring support shaft (20) and an outer ring support frame (31);
the inner ring supporting shaft (20) is used for fixedly assembling an inner ring of the bearing unit (9) to be detected;
the outer ring support frame (31) is used for fixedly assembling the outer ring of the detection unit to be detected;
one of the inner ring support shaft and the outer ring support frame (31) is a fixed part, the other one is a rotating part, the fixed part and the vacuum box (2) are relatively fixedly assembled, and the rotating part and the vacuum box (2) are relatively rotatably assembled;
the motor rotor (10) and the motor stator (11) which are matched for use are arranged in the vacuum box (2), the motor rotor (10) and the rotating piece are fixedly assembled to drive the rotating piece to rotate, the inner ring or the outer ring fixedly assembled with the rotating piece drives the rolling body of the bearing unit (9) to rotate, and then the rolling body applies vibration force to the outer ring or the inner ring fixedly assembled with the fixing piece;
the vibration sensor (7) is directly fixedly arranged on the fixed part or indirectly fixedly arranged on the fixed part through a rigid connecting piece (1) and is used for detecting the vibration condition of the outer ring or the inner ring fixedly assembled with the fixed part;
the upper computer is connected with a vibration sensor (7).
8. The bearing unit vibration testing system according to claim 7, wherein an axis of the inner ring support shaft extends in an up-down direction; when the inner ring supporting shaft is used as the fixing piece and the vibration sensor (7) is indirectly arranged on the fixing piece through the rigid connecting piece (1), the rigid connecting piece (1) is arranged at the top of the inner ring supporting shaft; the rigid connecting piece (1) is a threaded connecting piece, the lower end of the threaded connecting piece is fixedly assembled with the inner ring supporting shaft through a threaded connecting structure, and the upper end of the threaded connecting piece is fixedly assembled with the vibration sensor (7) through the threaded connecting structure; the lower end of the threaded connecting piece is provided with a bottom threaded column (101) to be in threaded connection with an internal threaded hole at the top end of the inner ring supporting shaft, and the upper end of the threaded connecting piece is provided with a top threaded hole (102) to be fastened and assembled with the vibration sensor (7).
9. The bearing unit vibration testing system according to claim 8, characterized in that the motor rotor (10) is coaxially and alternately sleeved outside the inner ring supporting shaft, a motor stator (11) is relatively and fixedly assembled in the vacuum box (2), the motor stator (11) is matched with the motor rotor (10) to ensure the motor rotor (10) to normally rotate, the motor stator (11) is in an annular interval, and the motor stator (11) is coaxially and alternately sleeved outside the inner ring supporting shaft.
10. The bearing unit vibration testing system according to claim 9, characterized in that said vacuum box (2) is supported mounted on a vibration isolation platform (15); the vacuum box (2) comprises a supporting bottom plate and an opening box body which is arranged in an inverted buckle mode, the supporting bottom plate and the opening box body are assembled in a sealing mode, and a vacuumizing structure is arranged on the supporting bottom plate; the supporting base plate is further provided with an electric connector unit (13) in a centralized mode, the electric connector unit (13) is connected with a signal line (8) and a power supply line (12), the power supply line (12) supplies power to the motor stator (11) to drive the motor rotor (10) to rotate, and the signal line (8) is connected with the vibration sensor (7).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110968853.4A CN113670615A (en) | 2021-08-23 | 2021-08-23 | Bearing unit vibration testing method and system |
| PCT/CN2021/126769 WO2023024242A1 (en) | 2021-08-23 | 2021-10-27 | Vibration test method and system for bearing unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110968853.4A CN113670615A (en) | 2021-08-23 | 2021-08-23 | Bearing unit vibration testing method and system |
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| CN113670615A true CN113670615A (en) | 2021-11-19 |
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| CN202110968853.4A Pending CN113670615A (en) | 2021-08-23 | 2021-08-23 | Bearing unit vibration testing method and system |
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| CN (1) | CN113670615A (en) |
| WO (1) | WO2023024242A1 (en) |
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| WO2023024242A1 (en) | 2023-03-02 |
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