Bearing test device for simulating unbalance amount of rotating shaft
By installing an unbalance simulation block in the bearing testing device and performing vibration analysis, the problem that existing devices cannot simulate the unbalance of rotating shafts has been solved, enabling the study of its impact on bearing performance and fault analysis.
Patent Information
- Application Number
- CN202511338667.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-11-11
AI Technical Summary
Existing bearing testing equipment cannot effectively simulate the imbalance of rotating shafts, resulting in insufficient research on vibration faults.
A bearing test device for simulating the unbalance of a rotating shaft was designed. By installing an unbalance simulation block inside the main shaft and combining axial and radial loading, the unbalance of the rotor system is simulated, and vibration signals are captured and analyzed by vibration sensors.
It achieves effective simulation of unbalance in rotating shafts, provides useful spectrum and amplitude information, fills the research gap on the impact of vibration conditions on bearing performance, and supports bearing vibration fault analysis.
Smart Images
Figure CN120927299A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to bearing testing equipment, specifically to a bearing testing equipment for simulating the imbalance of a rotating shaft, belonging to the field of bearing testing tooling technology. Background Technology
[0002] Uneven mass distribution in rotating components can cause the system's center of mass to misalign with the axis of rotation, resulting in imbalance. This imbalance leads to centrifugal force in the rotating machinery system, inducing vibration. This vibration can propagate throughout the entire system, causing vibration responses in mechanical components, bearings, and other parts, ultimately leading to failure. Recent failures show that bearing failures remain prominent and severe, making the measurement of imbalance in rotating components crucial. Although the failed bearings have undergone testing and verification, they still fail during use, indicating that current experimental verification and research are insufficient. Current bearing testing specifications simulate major operating conditions such as bearing speed, load, temperature, assembly, and lubrication. However, experimental research simulating the imbalance of rotating shafts is almost nonexistent. This patent fills this technological gap by designing a bearing testing device to simulate the imbalance of rotating shafts, enabling research on the impact of vibration conditions on bearing performance. Summary of the Invention
[0003] The purpose of this invention is to solve the problem that existing bearing tests cannot simulate the unbalance of rotating shafts, and to provide a bearing test device for simulating the unbalance of rotating shafts.
[0004] A bearing testing apparatus for simulating unbalance of a rotating shaft includes an axial load, a first bearing housing, a bed, an unbalance simulation block, a radial load body, a main shaft, a second bearing housing, and a radial load.
[0005] The first bearing housing and the second bearing are respectively installed at both ends of the bed. One end of the spindle is rotatably connected to the first bearing housing through the test bearing, and the other end of the spindle is rotatably connected to the second bearing housing. The axial load is set on the first bearing housing and applies axial load to the test bearing. The unbalance simulation block is eccentrically installed on the spindle. The radial load body is located between the first bearing housing and the second bearing and is fitted on the spindle. The radial load is set on the bed and applies radial load through the radial load body.
[0006] Furthermore, it also includes a spacer ring and two process bearings;
[0007] Two process bearings are mounted on the main shaft, and a spacer ring is located between the two process bearings. The inner ring of each process bearing is fitted onto the main shaft, and the outer ring of each process bearing is mounted on the radially loaded load body. The two ends of the spacer ring are respectively in contact with the two process bearings.
[0008] Furthermore, it also includes an axial loading sleeve, which is disposed in the first bearing housing, with one end of the axial loading sleeve pressing against the outer ring of the test bearing and the loading end of the axial loading pressing against the center of the axial loading sleeve.
[0009] Furthermore, it also includes a lock nut, which is threaded onto one end of the spindle where the test bearing is mounted, and the lock nut secures the inner ring of the test bearing to the position of the spindle.
[0010] Furthermore, the spindle is a hollow spindle with a groove machined at one end, and the unbalance simulation block is installed in the groove of the spindle.
[0011] Furthermore, it also includes locating bearings and locating flanges;
[0012] The outer ring of the positioning bearing is installed in the second bearing housing, the inner ring of the positioning bearing is fitted onto the spindle, and the positioning flange is detachably connected and installed on the second bearing housing, with the end face of the positioning flange resting against the positioning bearing.
[0013] Furthermore, it also includes a coupling that is mounted on the main shaft.
[0014] Furthermore, it also includes an oil sealing gland; the oil sealing gland is installed on the positioning flange and is used to seal between the positioning flange and the coupling.
[0015] Furthermore, it also includes a vibration sensor.
[0016] Vibration sensors are installed on the bed and monitor the bed.
[0017] The beneficial effects of this application are:
[0018] This invention proposes a hollow spindle design with an unbalance simulation block installed inside. By adjusting the weight of the unbalance simulation block, the unbalance of the rotor system is simulated. The unbalance vibration signal is captured by a vibration analyzer and converted into useful spectrum and amplitude information. The simulation results of the rotating shaft unbalance are quantified using the frequency and amplitude data of the vibration signal. This invention overcomes the insufficient simulation capability of rotating components in bearing testing equipment, fills the technological gap in the study of the impact of vibration conditions on bearing performance, and enables bearing vibration fault analysis. Attached Figure Description
[0019] Figure 1 This is the main structural view of this application;
[0020] Figure 2 for Figure 1 Sectional view along line AA;
[0021] Figure 3 for Figure 1BB-direction sectional view;
[0022] Figure 4 The spectrum of the vibration signal without the unbalanced block installed;
[0023] Figure 5 The vibration signal spectrum for installing the unbalanced block. Detailed Implementation
[0024] Combination Figures 1-3 This embodiment describes a bearing testing device for simulating the unbalance of a rotating shaft, which includes an axial load 1, a first bearing housing 3, a bed 4, an unbalance simulation block 7, a radial load body 10, a main shaft 12, a second bearing housing 14, and a radial load 18.
[0025] The first bearing housing 3 and the second bearing 14 are respectively installed at both ends of the bed 4. One end of the main shaft 12 is rotatably connected to the first bearing housing 3 through the test bearing 6, and the other end of the main shaft 12 is rotatably connected to the second bearing housing 14. The axial load 1 is set on the first bearing housing 3 and applies axial load to the test bearing 6. The unbalance simulation block 7 is eccentrically installed on the main shaft 12. The radial load body 10 is located between the first bearing housing 3 and the second bearing 14 and is fitted on the main shaft 12. The radial load 18 is set on the bed 4 and applies radial load through the radial load body 10.
[0026] Combination Figure 2 As shown, it also includes a spacer ring 11 and two process bearings 9;
[0027] Two process bearings 9 are mounted on the main shaft 12, and a spacer ring 11 is located between the two process bearings 9. The inner ring of each process bearing 9 is fitted onto the main shaft 12, and the outer ring of each process bearing 9 is mounted on the radial load body 10. The two ends of the spacer ring 11 are respectively in contact with the two process bearings 9.
[0028] Combination Figure 2 As shown, it also includes an axial loading sleeve 2, which is disposed in the first bearing housing 3, and one end of the axial loading sleeve 2 is pressed against the outer ring of the test bearing 6. The outer ring of the test bearing 6 is pressed by the axial loading sleeve 2, and the axial load is applied to the test bearing 6 by the axial loading sleeve 2. The loading end of the axial loading sleeve 1 is pressed against the center of the axial loading sleeve 2.
[0029] Combination Figure 2 As shown, it also includes a locking nut 5. One end of the main shaft 12 where the test bearing 6 is mounted is threaded with the locking nut 5. The locking nut 5 secures the inner ring of the test bearing 6 to the position on the main shaft 12. The locking nut 5 presses against the test bearing 6 to achieve axial positioning.
[0030] Combination Figure 2 , Figure 4 and Figure 5 As shown, the main shaft 12 is a hollow shaft with a groove machined at one end. The unbalance simulation block 7 is installed in the groove of the main shaft 12. The main shaft 12 is designed as a hollow shaft with the unbalance simulation block 7 installed inside. By adjusting the weight of the unbalance simulation block 7 inside the main shaft, the actual vibration condition of the rotor system is simulated. The unbalance vibration signal is captured by a vibration analyzer and converted into useful spectrum and amplitude information. The simulation result of the unbalance of the rotating shaft is quantified by the frequency and amplitude data of the vibration signal. The spectrum of the vibration signal without the unbalance block is shown below. Figure 4 As shown, the vibration signal spectrum with the unbalanced block installed is as follows: Figure 5 As shown in the figure, a comparison of the two figures reveals that after installing the unbalanced block, the vibration signal frequency amplitude increased from 33.2 με to 187 με.
[0031] Combination Figure 2 As shown, it also includes a positioning bearing 13 and a positioning flange 15;
[0032] The outer ring of the positioning bearing 13 is installed inside the second bearing housing 14, and the inner ring of the positioning bearing 13 is fitted onto the main shaft 12. The positioning flange 15 is detachably connected and installed on the second bearing housing 14, and the end face of the positioning flange 15 rests on the positioning bearing 13. The positioning flange 15 is used to position the positioning bearing 13 axially.
[0033] Combination Figure 2 As shown, it also includes a coupling 17, which is mounted on the main shaft 12. The entire test shaft system is connected to the electric main shaft via the coupling and driven to rotate.
[0034] Combination Figure 2 As shown, it also includes an oil sealing gland 16; the oil sealing gland 16 is mounted on the positioning flange 15 and is used to seal the space between the positioning flange 15 and the coupling 17. The oil sealing gland 16 is used to prevent lubricating oil from splashing out.
[0035] Combination Figure 2 As shown, it also includes a vibration sensor 8, which is installed on the bed 4 and monitors the bed 4.
Claims
1. A bearing testing device for simulating the unbalance of a rotating shaft, characterized in that: It includes an axial load (1), a first bearing housing (3), a bed (4), an unbalanced quantity simulation block (7), a radial load body (10), a spindle (12), a second bearing housing (14), and a radial load (18). The first bearing housing (3) and the second bearing (14) are respectively installed at both ends of the bed (4). One end of the main shaft (12) is rotatably connected to the first bearing housing (3) through the test bearing (6), and the other end of the main shaft (12) is rotatably connected to the second bearing housing (14). The axial load (1) is set on the first bearing housing (3) and loads the test bearing (6) axially. The unbalance simulation block (7) is eccentrically installed on the main shaft (12). The radial load body (10) is located between the first bearing housing (3) and the second bearing (14) and is fitted on the main shaft (12). The radial load (18) is set on the bed (4) and is radially loaded through the radial load body (10).
2. The bearing test apparatus for simulating the unbalance of a rotating shaft according to claim 1, characterized in that: It also includes a spacer ring (11) and two process bearings (9). Two process bearings (9) are mounted on the main shaft (12), and a spacer ring (11) is located between the two process bearings (9). The inner ring of each process bearing (9) is fitted on the main shaft (12), and the outer ring of each process bearing (9) is mounted on the radial load body (10). The two ends of the spacer ring (11) are respectively in contact with the two process bearings (9).
3. The bearing test apparatus for simulating the imbalance of a rotating shaft according to claim 1, characterized in that: It also includes an axial loading sleeve (2), which is disposed in the first bearing housing (3), and one end of the axial loading sleeve (2) rests on the outer ring of the test bearing (6), and the loading end of the axial load (1) rests on the center of the axial loading sleeve (2).
4. The bearing test apparatus for simulating the unbalance of a rotating shaft according to claim 1, characterized in that: It also includes a locking nut (5), and a locking nut (5) is threaded onto one end of the test bearing (6) mounted on the main shaft (12). The locking nut (5) fixes the inner ring of the test bearing (6) at the position of the main shaft (12).
5. The bearing test apparatus for simulating the imbalance of a rotating shaft according to claim 1, characterized in that: The spindle (12) is a hollow shaft with a groove machined at one end. The unbalanced quantity simulation block (7) is installed in the groove of the spindle (12).
6. The bearing test apparatus for simulating the unbalance of a rotating shaft according to claim 1, characterized in that: It also includes a locating bearing (13) and a locating flange (15); The outer ring of the positioning bearing (13) is installed inside the second bearing housing (14), the inner ring of the positioning bearing (13) is fitted on the main shaft (12), and the positioning flange (15) is detachably connected and installed on the second bearing housing (14), with the end face of the positioning flange (15) pressing against the positioning bearing (13).
7. The bearing test apparatus for simulating the unbalance of a rotating shaft according to claim 1, characterized in that: It also includes a coupling (17) mounted on the main shaft (12).
8. A bearing testing apparatus for simulating the imbalance of a rotating shaft according to claim 6 or 7, characterized in that: It also includes an oil sealing gland (16); the oil sealing gland (16) is mounted on the positioning flange (15) and is used to seal between the positioning flange (15) and the coupling (17).
9. The bearing test apparatus for simulating the unbalance of a rotating shaft according to claim 1, characterized in that: It also includes a vibration sensor (8). Vibration sensor (8) is installed on bed (4) and monitors bed (4).