Bearing electrical life detection device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CRRC ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO LTD
- Filing Date
- 2022-08-31
- Publication Date
- 2026-07-21
Smart Images
Figure CN117665428B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of bearing testing equipment technology, and in particular to a bearing electrical life testing device. Background Technology
[0002] Variable frequency drive systems are widely used due to their excellent speed regulation performance. However, the high-frequency common-mode voltage output by the PWM inverter generates shaft current under the influence of the coupling capacitor inside the motor. This current can lead to electrochemical corrosion of the motor bearings. When the electrical life of the bearing is lower than its designed mechanical life, premature bearing failure will occur. Currently, bearing electrochemical corrosion is widespread in industries such as rail transportation, wind power, electric vehicles, and shipbuilding. With the application of SiC technology, the risk of premature bearing failure due to electrochemical corrosion is increasing. Premature bearing failure poses serious safety hazards, and replacing bearings in large equipment is often very costly, while also affecting production and equipment use. Therefore, the electrical life of the bearing is crucial to bearing selection during the system design phase. Since there are still no relevant standard requirements for the electrical life of bearings in variable frequency drive system motors, academic research on bearing electrical life and remaining life is still in the theoretical stage. Therefore, it is necessary to test and evaluate the electrical life of bearings through experimental methods and study their tolerance performance under specific electrical conditions. Summary of the Invention
[0003] To address the problems in the prior art, this application proposes a bearing electrical life testing device for detecting the electrical life of bearings.
[0004] The present invention provides a bearing electrical life testing device, the bearing electrical life testing device comprising:
[0005] The test bearing mechanism includes a test bearing housing and a test bearing shaft that are insulated and mounted on the test platform. The test bearing shaft is used to mount the test bearing and is mounted on the test bearing housing.
[0006] A radial load application mechanism includes a connecting shaft and a radial load application assembly mounted on the testing platform. The radial load application assembly applies a radial load to the connecting shaft, and a first end of the connecting shaft is insulated from one end of the tested bearing shaft.
[0007] A rotary drive mechanism is mounted on the detection table and connected to the second end of the connecting shaft. The rotary drive mechanism is used to drive the connecting shaft to rotate.
[0008] As a further improvement to the above technical solution:
[0009] The aforementioned bearing electrical life testing device further includes a testing platform, wherein the bearing housing under test, the radial load application component, and the rotary drive mechanism are all mounted on the testing platform of the testing platform.
[0010] In the aforementioned bearing electrical life testing device, the bearing housing under test is provided with a voltage excitation loading bolt, and a conductive post is provided at the end of the bearing shaft under test away from the connecting shaft.
[0011] In the aforementioned bearing electrical life testing device, the conductive column is coaxially arranged with the shaft of the bearing under test, and the testing platform is also provided with an insulating support column, the end of the conductive column away from the shaft of the bearing under test being rotatably mounted on the insulating support column.
[0012] In the aforementioned bearing electrical life testing device, the bearing housing under test is insulated and mounted on the testing stand via a pad, the pad being used to adjust the height of the bearing housing under test.
[0013] In the aforementioned bearing electrical life testing device, the first end of the connecting shaft is connected to one end of the test bearing shaft via a coupling, and one end of the test bearing shaft is connected to the coupling via an insulating sleeve.
[0014] The aforementioned bearing electrical life testing device further includes a radial load application assembly comprising a radial load support, a radial load application bearing housing, and a vertical guide column fixed relative to the radial load support. The connecting shaft is rotatably mounted on the radial load application bearing housing. A force-applying component is mounted on the radial load support, and the force-applying component can drive the radial load application bearing housing to move along the vertical guide column, thereby applying a radial load to the connecting shaft.
[0015] In the aforementioned bearing electrical life testing device, a force sensor is further provided between the force-applying component and the radial load-applying bearing housing. The force sensor is used to detect the radial load applied by the radial load-applying component to the connecting shaft.
[0016] The aforementioned bearing electrical life testing device further includes an auxiliary support assembly in which the radial load application mechanism includes an auxiliary support bearing housing and an auxiliary support bearing mounted on the auxiliary support bearing housing. The two ends of the connecting shaft are respectively mounted on the radial load application bearing and the auxiliary support bearing.
[0017] In the aforementioned bearing electrical life testing device, the output shaft of the rotary drive mechanism is further connected to the second end of the connecting shaft via an insulated coupling.
[0018] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.
[0019] The bearing electrical life testing device provided by this invention has at least the following advantages compared with the prior art: When it is necessary to test the electrical life of a bearing, the bearing under test is first placed on the bearing shaft under test, then installed on the bearing housing under test, and then one end of the bearing shaft under test is insulated and connected to the first end of the connecting shaft. During the test, the rotary drive mechanism drives the connecting shaft to rotate and drives the bearing shaft under test to rotate. At the same time, the radial load application component applies a radial load to the connecting shaft, that is, a radial load can be applied to the bearing under test through the bearing shaft under test to simulate the stress condition of the bearing under test under actual working conditions. At the same time, a pulse voltage is applied to the bearing under test through the bearing housing under test, and a circuit is formed through the end of the bearing shaft under test away from the connecting shaft. The bearing under test is observed to obtain the electrical life of the bearing under test. Using this bearing electrical life testing device, the electrical life of bearings can be tested by replacing the bearing shaft and bearing housing with matching ones according to the specifications of the bearing under test. This allows for life testing of bearings of different specifications under different speeds, radial loads, and voltage loads. Furthermore, by connecting multiple bearing shafts and corresponding bearing housings in series, multiple bearings can be tested simultaneously at the same speed and radial load, improving testing efficiency. The bearing shaft under test is insulated from the connecting shaft, preventing the connecting shaft from being affected by pulse voltages applied to the bearing under test.
[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.
[0023] Figure 1 This shows a three-dimensional structural schematic diagram of the bearing electrical life testing device provided in an embodiment of the present invention;
[0024] Figure 2 This shows a front view of the bearing electrical life testing device provided in an embodiment of the present invention;
[0025] Figure 3This shows a schematic diagram of the bearing under test mechanism of the bearing electrical life testing device provided in an embodiment of the present invention;
[0026] Figure 4 A schematic diagram of the radial load application mechanism of the bearing electrical life testing device provided in an embodiment of the present invention is shown.
[0027] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.
[0028] Figure label:
[0029] 100-Bearing electrical life testing device; 110-Bearing under test mechanism; 111-Bearing under test housing; 112-Bearing under test shaft; 113-Bearing under test; 114-Voltage excitation loading bolt; 115-Conductive column; 116-Insulating support column; 117-Pan block; 120-Radial load application mechanism; 121-Connecting shaft; 122-Radial load bracket; 123-Radial load application bearing housing; 124-Vertical guide column; 125-Force application component; 126-Force sensor; 127-Auxiliary support bearing housing; 128-Auxiliary support bearing; 129-Radial load application bearing; 130-Rotary drive mechanism; 140-Testing stand; 141-Shock absorber; 150-Coupling; 160-Insulating sleeve; 170-Insulating coupling. Detailed Implementation
[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0035] The invention will now be further described with reference to the accompanying drawings.
[0036] This invention provides a bearing electrical life testing device 100 for testing the electrical life of bearings.
[0037] like Figures 1 to 4 As shown, the bearing electrical life testing device 100 provided in this embodiment of the invention includes a test bearing mechanism 110, a radial load application mechanism 120, and a rotary drive mechanism. The test bearing mechanism 110 includes a test bearing housing 111 and a test bearing shaft 112 insulatedly mounted on the test table. The test bearing shaft 112 is used to mount a test bearing 113 and is mounted on the test bearing housing 111. The radial load application mechanism 120 includes a connecting shaft 121 and a radial load application assembly mounted on the test table. The radial load application assembly is used to apply a radial load to the connecting shaft 121, and the first end of the connecting shaft 121 is insulatedly connected to one end of the test bearing shaft 112. The rotary drive mechanism is mounted on the test table and is connected to the second end of the connecting shaft 121. The rotary drive mechanism is used to drive the connecting shaft 121 to rotate.
[0038] When electrical life testing of a bearing is required, the bearing under test 113 is first placed on the bearing under test shaft 112, and then installed on the bearing under test housing 111. One end of the bearing under test shaft 112 is then insulatedly connected to the first end of the connecting shaft 121. During testing, the rotary drive mechanism drives the connecting shaft 121 to rotate and drives the bearing under test shaft 112 to rotate. At the same time, the radial load application component applies a radial load to the connecting shaft 121, that is, a radial load can be applied to the bearing under test 113 through the bearing under test shaft 112 to simulate the stress condition of the bearing under test 113 under actual working conditions. Simultaneously, a pulse voltage is applied to the bearing under test 113 through the bearing under test housing 111, and a circuit is formed through the end of the bearing under test shaft 112 away from the connecting shaft 121. The bearing under test 113 is then observed to obtain its electrical life.
[0039] Using the bearing electrical life testing device 100 provided in this embodiment of the invention to perform electrical life testing on bearings, the device allows for the replacement of matching bearing shafts 112 and bearing housings 111 according to the specifications of the bearing under test 113, enabling life testing of bearings of different specifications under different speeds, radial loads, and voltage loads. Furthermore, by connecting multiple bearing shafts 112 and corresponding bearing housings 111 in series, multiple bearings 113 can be tested simultaneously at the same speed and radial load, improving bearing testing efficiency. The bearing shaft 112 is insulated from the connecting shaft 121, preventing the connecting shaft 121 from being affected by pulse voltages applied to the bearing under test 113.
[0040] The bearing electrical life testing device 100 provided in this embodiment of the invention is further described in detail below. Figure 1 and Figure 2 The bearing electrical life testing device 100 also includes a testing platform, on which the bearing housing 111 under test, the radial load application component, and the rotary drive mechanism are all mounted. The testing platform provides mounting positions for the bearing housing 111 under test, the radial load application component, and the rotary drive mechanism, and allows the bearing electrical life testing device 100 provided in this embodiment of the invention to be moved as a whole, facilitating adjustment of its position. In this embodiment, a damping element 141 is provided at the part of the testing platform that contacts the ground, which can reduce the vibration of the bearing electrical life testing device 100 provided in this embodiment of the invention during operation.
[0041] The bearing electrical life testing device 100 provided in this embodiment of the invention further includes a voltage excitation loading bolt 114 on the bearing housing 111 under test, and a conductive post 115 at the end of the bearing shaft 112 under test away from the connecting shaft 121. A pulse voltage is applied to the bearing 113 under test through the voltage excitation loading bolt 114, and a circuit is formed through the conductive post 115. Furthermore, the conductive post 115 is coaxially arranged with the bearing shaft 112 under test, and an insulating support post 116 is also provided on the testing platform. The end of the conductive post 115 away from the bearing shaft 112 under test is rotatably mounted on the insulating support post 116. The insulating support post 116 can support the conductive post 115, and the wire only needs to be connected to the end of the conductive post 115.
[0042] In this embodiment, the conductive post 115 is made of carbon fiber, which has good electrical conductivity. Of course, it is understood that the conductive post 115 can also be replaced by a carbon brush, a pipe brush, or a conductive ring.
[0043] The bearing electrical life testing device 100 provided in this embodiment of the invention is further described in detail below. Figure 1 , Figure 2 as well as Figure 3 The bearing housing 111 under test is insulated and mounted on the test bench via a shim 117, which is used to adjust the height of the bearing housing 111. The shim 117 can adjust the height of the bearing housing 111 under test so that the bearing shaft 112 under test and the connecting shaft 121 are at the same height. For bearings 113 of different specifications, shims 117 of different heights can be replaced to make the bearing shaft 112 under test and the connecting shaft 121 at the same height.
[0044] In this embodiment, the fixing bolt passes through the bearing housing 111 and the pad 117 in sequence and is installed on the test bench. An insulating pad is provided between the bearing housing 111 and the pad 117, and an insulating component is also provided between the fixing bolt and the bearing housing 111, thereby achieving the purpose of insulating the bearing housing 111 from the test bench.
[0045] The bearing electrical life testing device 100 provided in this embodiment of the invention specifically includes a first end of a connecting shaft 121 connected to one end of a test bearing shaft 112 via a coupling 150, and one end of the test bearing shaft 112 connected to the coupling 150 via an insulating sleeve 160. The insulating sleeve 160 prevents the application of pulse voltage to the test bearing 113 from flowing to the connecting shaft 121, thereby preventing the connecting shaft 121 from being affected by the pulse voltage applied to the test bearing 113.
[0046] The bearing electrical life testing device 100 provided in this embodiment of the invention is described in detail in the attached document. Figure 1 and Figure 4The radial load application assembly includes a radial load support 122, a radial load application bearing housing 123, and a vertical guide post 124 fixed relative to the radial load support 122. A connecting shaft 121 is rotatably mounted on the radial load application bearing housing 123 via a radial load application bearing 129. A force-applying element 125 is mounted on the radial load support 122, which drives the radial load application bearing housing 123 to move along the vertical guide post 124, thereby applying a radial load to the connecting shaft 121. A force sensor 126 is provided between the force-applying element 125 and the radial load application bearing housing 123. The force sensor 126 is used to detect the radial load applied to the connecting shaft 121 by the radial load application assembly.
[0047] In this embodiment, the force-applying component 125 is an adjusting bolt, which is threadedly connected to the upper part of the radial load support 122. By rotating the adjusting bolt, the adjusting bolt can move up and down relative to the radial load support 122, thereby driving the radial load application bearing seat 123 to move along the vertical guide post 124, so as to apply different radial loads to the radial load application bearing seat 123. Furthermore, a force sensor 126 is provided between the force-applying component 125 and the radial load application bearing seat 123. The force sensor 126 can detect the radial load applied by the radial load application assembly to the connecting shaft 121.
[0048] The bearing electrical life testing device 100 provided in this embodiment of the invention is further described in detail below. Figure 1 and Figure 2 The radial load application mechanism 120 also includes an auxiliary support assembly, which includes an auxiliary support bearing housing 127 and an auxiliary support bearing 128 mounted on the auxiliary support bearing housing 127. The two ends of the connecting shaft 121 are respectively mounted on the radial load application bearing 129 and the auxiliary support bearing 128. The auxiliary support assembly can maintain the balance of the connecting shaft 121, making the rotation of the connecting shaft 121 more stable.
[0049] The bearing electrical life testing device 100 provided in this embodiment of the invention further includes an output shaft of the rotary drive mechanism connected to the second end of the connecting shaft 121 via an insulated coupling 170. The insulated coupling 170 can transmit power between the rotary drive mechanism and the connecting shaft 121 while preventing current from flowing between them. In this embodiment, a variable frequency drive motor is selected for the rotary drive mechanism.
[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0051] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.
Claims
1. A bearing electrical life testing device, characterized in that, The bearing electrical life testing device includes: The test bearing mechanism includes a test bearing housing and a test bearing shaft that are insulated and mounted on the test platform. The test bearing shaft is used to mount the test bearing and is mounted on the test bearing housing. A radial load application mechanism includes a connecting shaft and a radial load application assembly mounted on the testing platform. The radial load application assembly applies a radial load to the connecting shaft, and a first end of the connecting shaft is insulated from one end of the tested bearing shaft. A rotary drive mechanism is mounted on the detection table and connected to the second end of the connecting shaft. The rotary drive mechanism is used to drive the connecting shaft to rotate. The bearing housing under test is provided with a voltage excitation loading bolt, and a conductive post is provided at the end of the bearing shaft under test away from the connecting shaft. The conductive post is coaxially arranged with the shaft of the bearing under test, and an insulating support post is also provided on the test platform. The end of the conductive post away from the shaft of the bearing under test is rotatably mounted on the insulating support post. The first end of the connecting shaft is connected to one end of the test bearing shaft via a coupling, and one end of the test bearing shaft is connected to the coupling via an insulating sleeve; The radial load application assembly includes a radial load bracket, a radial load application bearing seat, and a vertical guide column fixed relative to the radial load bracket. The connecting shaft is rotatably mounted on the radial load application bearing seat. A force-applying component is installed on the radial load bracket. The force-applying component can drive the radial load application bearing seat to move along the vertical guide column, thereby applying a radial load to the connecting shaft. The force-applying component is an adjusting bolt, and the force-applying component is threadedly connected to the upper part of the radial load bracket.
2. The bearing electrical life testing device according to claim 1, characterized in that, The bearing housing under test is insulated and mounted on the test platform via a pad, which is used to adjust the height of the bearing housing under test.
3. The bearing electrical life testing device according to claim 1 or 2, characterized in that, The bearing electrical life testing device also includes a testing stand, on which the bearing housing under test, the radial load application component, and the rotary drive mechanism are all mounted.
4. The bearing electrical life testing device according to claim 1, characterized in that, A force sensor is provided between the force-applying component and the radial load-applying bearing housing. The force sensor is used to detect the radial load applied by the radial load-applying component to the connecting shaft.
5. The bearing electrical life testing device according to claim 1, characterized in that, The radial load application mechanism further includes an auxiliary support assembly, which includes an auxiliary support bearing housing and an auxiliary support bearing mounted on the auxiliary support bearing housing. The two ends of the connecting shaft are respectively mounted on the radial load application bearing and the auxiliary support bearing.
6. The bearing electrical life testing device according to claim 1 or 2, characterized in that, The output shaft of the rotary drive mechanism is connected to the second end of the connecting shaft via an insulated coupling.