Insulated Bearing Test Equipment

Abstract

The insulating bearing test equipment provided by the present invention includes a rotating shaft, a bearing seat, a voltage loading device and an insulation performance testing device. The inner ring of the insulating bearing is sleeved on the test end of the rotating shaft, and an inner ring insulation component is arranged between the inner ring of the insulating bearing and the rotating shaft; the outer ring of the insulating bearing is sleeved in the bearing seat, and an outer ring insulation component is arranged between the outer ring of the insulating bearing and the bearing seat; the voltage loading device is used to apply voltage loading to the insulating bearing; the insulation performance testing device is used to detect the insulation performance of the insulating bearing. It drives the insulating bearing to rotate through the rotating shaft, and tests the insulation performance of the insulating bearing during the rotation process of the insulating bearing. Voltage loading can also be applied to the insulating bearing during the test, and the test result has high accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing, and particularly to an insulation bearing test equipment. Background Art

[0002] Rolling bearings are widely used in the rotor systems of industrial generators. When the generator generates electricity, a voltage environment is generated, and an electric potential is formed on the outer ring of the insulation bearing inside the bearing. When the voltage reaches a certain level, it is easy to cause the breakdown of the oil film, which in turn causes electrical erosion failure of the bearing, seriously affecting the normal operation of the motor. In order to reduce the electrical corrosion of the bearing caused by the generation of shaft current, insulation bearings are currently being used. Insulation bearings refer to spraying composite insulation materials on the outer ring of the insulation bearing inside the bearing, so that the outer ring of the insulation bearing inside the bearing is insulated from the rotating shaft and the end cover, thereby improving the service life of the bearing. The insulation performance of the insulation bearing and the degradation of the insulation performance during operation directly affect the bearing life and the safety of the equipment in use. Therefore, a special insulation bearing test and detection device is needed to detect the insulation performance of the bearing in the operating state.

[0003] The existing insulation bearing detection tooling mainly detects the insulation performance of the bearing in a static state by making a point contact between an insulation resistance meter and the insulation point on the outer ring of the bearing. It can only detect bearings with insulation coatings on the outer ring of the insulation bearing in a static state, and cannot effectively test the insulation performance of the inner and outer rings in a rotating state. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an insulation bearing test equipment to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An insulation bearing test equipment, comprising: a rotating shaft, the inner ring of the insulation bearing is sleeved on the test end of the rotating shaft, and an inner ring insulation assembly is arranged between the inner ring of the insulation bearing and the rotating shaft; a bearing seat, the outer ring of the insulation bearing is sleeved in the bearing seat, and an outer ring insulation assembly is arranged between the outer ring of the insulation bearing and the bearing seat; a voltage loading device for applying voltage loading to the insulation bearing; two wiring terminals of the voltage loading device are respectively electrically connected to the inner ring of the insulation bearing and the outer ring of the insulation bearing; and an insulation performance test device for detecting the insulation performance of the insulation bearing.

[0007] Furthermore, it further includes a conductive slip ring arranged on the test end of the rotating shaft. The voltage loading device and the insulation performance test device are both electrically connected to the inner ring of the insulation bearing through the conductive slip ring. The rotor of the conductive slip ring is installed on the end face of the test end of the rotating shaft and rotates with the rotation of the rotating shaft. The rotor of the conductive slip ring is electrically connected to the inner ring of the insulation bearing through a wire; the stator of the conductive slip ring is fixedly installed in the bearing seat.

[0008] Further, the insulation performance testing device is used to detect the insulation performance of the inner ring and / or the outer ring of the insulated bearing; the insulation performance testing device includes a first testing device for measuring the resistance of the outer ring of the insulated bearing during operation and a second testing device for testing the resistance, current and capacitance of the outer ring and the inner ring of the insulated bearing during operation.

[0009] Further, it further includes a radial loading device for applying a radial load to the rotating shaft, and the radial loading device includes: a loading box sleeved on the bearing seat;

[0010] Two radial loading hydraulic cylinders are symmetrically arranged on both sides of the loading box perpendicular to the axial direction of the rotating shaft. One end of each radial loading hydraulic cylinder is hinged to the loading box, and the other end is hinged to the base.

[0011] Further, the base is slidably arranged on the bottom plate along the axial direction of the rotating shaft through a slide rail mechanism.

[0012] Further, it further includes an axial loading device for applying an axial load to the rotating shaft. The axial loading device includes an axial loading hydraulic cylinder arranged parallel to the axial direction of the rotating shaft. A connecting plate is arranged on the lower end side of the loading box. One end of the axial loading hydraulic cylinder is hinged to the connecting plate, and the other end is hinged to a loading support seat arranged on the base.

[0013] Further, it further includes an axial limiting device arranged outside the loading box. The axial limiting device is located at the top of the axial loading device and includes fixed seats symmetrically arranged on the loading support seats, a limiting ejector rod telescopically arranged in the hole cavity of the fixed seat, a set screw for locking the limiting ejector rod is arranged on the side wall of the hole cavity, and the limiting ejector rod axially abuts against the loading box.

[0014] Further, the outer ring insulation assembly includes an outer insulation sleeve ring sleeved in the bearing seat and an outer conductive uniform distribution ring sleeved on the outer insulation sleeve ring and in contact with the outer ring of the insulated bearing.

[0015] One end of the inner wall of the outer conductive uniform distribution ring close to the outer end face of the outer ring of the insulated bearing is provided with a first annular flange in contact with the outer end face of the outer ring of the insulated bearing, and a first wiring terminal is arranged on the first annular flange.

[0016] One end of the outer conductive uniform distribution ring far from the outer end face of the outer ring of the insulated bearing is provided with a voltage conducting cover in contact with the inner end face of the outer ring of the insulated bearing, and a second wiring terminal is arranged on the voltage conducting cover close to the inner end face of the insulated bearing.

[0017] Further, the inner ring insulation assembly includes an inner insulation collar sleeved on the test end of the rotating shaft, an inner conductive uniform distribution ring sleeved inside the inner insulation collar and in contact with the inner insulation layer of the insulated bearing inner ring. One end of the inner conductive uniform distribution ring close to the outer end face of the inner ring of the insulated bearing is sleeved with a conductive washer in contact with the outer end face of the inner ring of the insulated bearing. The conductive washer is fixed by a compression nut. An insulating shaft sleeve is arranged between the conductive washer and the compression nut. A third terminal connected to the conductive washer is arranged on the insulating shaft sleeve.

[0018] Further, it further includes a main shaft driving mechanism. The rotating shaft is connected to the main shaft in the main shaft driving mechanism, and the main shaft in the main shaft driving mechanism drives the rotating shaft to rotate.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] The insulated bearing test equipment provided by the present invention includes a rotating shaft, a bearing seat, a voltage loading device and an insulation performance testing device. The inner ring of the insulated bearing is sleeved on the test end of the rotating shaft, and an inner ring insulation assembly is arranged between the inner ring of the insulated bearing and the rotating shaft; the outer ring of the insulated bearing is sleeved in the bearing seat, and an outer ring insulation assembly is arranged between the outer ring of the insulated bearing and the bearing seat; the voltage loading device is used to apply voltage loading to the insulated bearing; the insulation performance testing device is used to detect the insulation performance of the insulated bearing. It drives the insulated bearing to rotate through the rotating shaft and tests its insulation performance during the rotation of the insulated bearing. Voltage loading can also be applied to the insulated bearing during the test, and the test results are highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0023] Figure 3 It is an internal structural schematic diagram of the bearing seat of an embodiment of the present invention;

[0024] Figure 4 It is a test principle schematic diagram of an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the conductive slip ring of an embodiment of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the outer insulation collar of an embodiment of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the voltage conducting cover of an embodiment of the present invention;

[0028] Figure 8Schematic diagram of the outer conductive uniform distribution ring according to an embodiment of the present invention;

[0029] Figure 9 Schematic diagram of the inner insulating sleeve ring according to an embodiment of the present invention;

[0030] Figure 10 Schematic diagram of the inner conductive uniform distribution ring according to an embodiment of the present invention..

[0031] In the figure: 1. Rotating shaft, 1.1 Flange, 2. Bearing housing, 5. Main shaft drive mechanism, 5.1 Main shaft, 5.2 Axle box, 6. Conductive slip ring, 6.1 Rotor, 6.2 Stator, 6.3 Connecting shaft, 6.4 Fixed end cover, 7. Insulating bearing, 7.1 Outer ring, 7.2 Inner ring, 8. Outer insulating sleeve ring, 8.1 Second annular flange, 8.2 Positioning flange, 9. Outer conductive uniform distribution ring, 9.1 First annular flange, 10. First terminal, 11. Voltage conducting cover, 11.1 Third annular flange, 12. Second terminal, 13. Inner insulating sleeve ring, 13.1 Fifth annular flange, 14. Inner conductive uniform distribution ring, 14.1 Fourth annular flange, 15. Conductive washer, 16. Insulating bushing, 17. Compression nut, 18. Third terminal, 19. Voltage loading device, 20. First testing device, 21. Second testing device, 22. Loading box, 23. Radial loading hydraulic cylinder, 24. Transition plate, 25. First connection cover, 27. Base, 28. Axial loading hydraulic cylinder, 29. Connection plate, 30. Loading support seat, 31. Fixed seat, 32. Limit ejector rod, 33. Set screw, 34. Base plate, 35. Rotating direction of the rotating shaft, 36. Direction of the radial loading force, 37. Direction of the axial loading force, 38. Outer ring resistance value testing circuit, 39. Inner and outer ring current value testing circuit, 40. Inner and outer ring resistance value testing circuit, 41. Voltage loading circuit. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Embodiment 1

[0034] As Figures 1 - 10 shown, an insulating bearing test equipment includes a main shaft drive mechanism 5, a rotating shaft 1, a bearing housing 2, a voltage loading device 19, an insulation performance testing device, a radial loading device, an axial loading device, and a conductive slip ring 6 provided on the rotating shaft 1.

[0035] It should be noted that insulating layers are provided on the inner circumferential surface of the inner ring 7.2 of the insulating bearing 7 and on the end faces on both sides of the inner ring 7.2, and insulating layers are provided on the outer circumferential surface of the outer ring 7.1 of the insulating bearing 7 and on the end faces on both sides of the outer ring 7.1.

[0036] As Figure 1 shown, the main shaft driving mechanism 5 includes a main shaft 5.1 and a housing 5.2. The main shaft 5.1 is rotatably arranged in the housing 5.2 through a plurality of bearings. The housing 5.2 is fixedly arranged on the bottom plate 34. One end of the housing 5.1 is provided with a motor for driving the main shaft 5.1 to rotate, and the motor is drivingly connected to the main shaft 5.1 through a belt pulley mechanism.

[0037] The rotating shaft 1 in this embodiment is a flange shaft. A flange is provided at one end of the rotating shaft 1, and the other end of the rotating shaft 1 is a test end. The flange 1.1 at one end of the rotating shaft 1 is connected to the main shaft 5.1 through a first connection cover 25. During installation, the first connection cover 25 is coaxially installed on the end face of the main shaft 5.1 through bolts, and the flange 1.1 at one end of the rotating shaft 1 is coaxially installed on the end face of the first connection cover 25 away from the main shaft 5.1 through bolts. During use, the main shaft 5.1 in the main shaft driving mechanism 5 drives the rotating shaft 1 to rotate. In this embodiment, by setting the rotating shaft 1 as a flange shaft, the detachable connection between the rotating shaft 1 and the main shaft 5.1 is realized, which is convenient for replacing the rotating shaft 1 with different diameters to test insulating bearings 7 of different models. It should be noted that in another embodiment, the rotating shaft 1 and the main shaft 5.1 are integrally provided.

[0038] The inner ring 7.2 of the insulating bearing 7 is sleeved at the shaft shoulder of the test end of the rotating shaft 1, and an inner ring insulating assembly is provided between the inner ring 7.2 of the insulating bearing 7 and the test end of the rotating shaft 1; the inner ring insulating assembly includes an inner insulating collar 13 sleeved at the shaft shoulder of the test end of the rotating shaft 1, an inner conductive uniform ring 14 sleeved in the inner insulating collar 13 and in close contact with the insulating layer of the inner ring 7.2 of the insulating bearing 7. One end of the inner conductive uniform ring 14 close to the inner end face of the inner ring 7.2 of the insulating bearing 7 is provided with a fourth annular flange 14.1 abutting against the inner end face of the inner ring 7.2 of the insulating bearing 7. One end of the inner insulating collar 13 close to the fourth annular flange 14.1 is provided with a fifth annular flange 13.1 abutting against the fourth annular flange 14.1. During installation, the side of the fifth annular flange 13.1 away from the fourth annular flange 14.1 abuts against the shaft shoulder of the test end of the rotating shaft 1 bearing. Axial limit is achieved through the shaft shoulder.

[0039] A conductive washer 15 that contacts the outer end face of the inner ring 7.2 of the insulating bearing 7 is sleeved on one end of the inner conductive uniform ring 14 close to the outer end face of the inner ring 7.2 of the insulating bearing 7. The conductive washer 15 is press-fitted and fixed to the test end of the rotating shaft by a compression nut 17. An insulating bushing 16 is arranged between the conductive washer 15 and the compression nut 17. A third terminal 18 connected to the conductive washer 15 is arranged on the insulating bushing 16. Specifically, the insulating bushing 16 is preferably made of an insulating material, which is used for the axial positioning of the inner ring insulating component and isolates the axial current. The insulating bushing 16 is sleeved on the test end of the rotating shaft 1 and abuts against the conductive washer 15. The compression nut 17 is screwed onto the test end of the rotating shaft 1. The third terminal 18 is preferably a copper slotted flat head screw. The threaded section of the flat head screw is screwed into the threaded through hole on the insulating bushing 16 and abuts against the end face of the conductive washer 15, which is used to fixedly connect the wire of the voltage loading device 19 and the insulating performance testing device, realizing the electrical connection between the wire and the conductive washer 15. The inner insulating sleeve ring 13 is preferably made of an insulating material, which is used to isolate the current between the insulating bearing 7 and the rotating shaft 1, ensuring the safety of the test and preventing other parts of the test equipment from being electrically eroded.

[0040] It should be noted that the end face of the conductive washer 15 is closely fitted with the end face of the inner ring 7.2 of the tested insulating bearing 7 and acts together with the inner conductive uniform ring to achieve the full coverage of the inner ring 7.2 of the insulating bearing 7, conducting all possible defects in the insulating coating of the inner ring 7.2 of the tested insulating bearing 7, and realizing the effective test of the insulating performance of the insulating bearing 7.

[0041] The outer ring 7.1 of the insulating bearing 7 is sleeved in the mounting hole of the bearing housing 2, and an outer ring insulating assembly is provided between the outer ring 7.1 of the insulating bearing 7 and the bearing housing 2; the outer ring insulating assembly includes an outer insulating collar 8 sleeved in the bearing housing 2, an outer conductive uniform ring 9 sleeved in the outer insulating collar 8 and in contact with the outer ring 7.1 of the insulating bearing 7. One end of the inner wall of the outer conductive uniform ring 9 close to the outer end face of the outer ring 7.1 of the insulating bearing 7 is provided with a first annular flange 9.1 in contact with the outer end face of the outer ring 7.1 of the insulating bearing 7. A first terminal 10 is arranged on the first annular flange 9.1. One end of the inner wall of the outer insulating collar 8 close to the outer end face of the outer ring 7.1 of the insulating bearing 7 is provided with a second annular flange 8.1 abutting against the first annular flange 9.1. The first terminal 10 passes through the through hole of the second annular flange 8.1 and is screwed into the threaded hole of the first annular flange 9.1. The first terminal 10 is preferably a copper slotted flat head screw, which is used to fixedly connect the voltage loading device 19 and the wire of the insulation performance testing device; in this embodiment, a part of the end face of the second annular flange 8.1 on the outer insulating collar 8 abuts against the step of the mounting hole of the bearing housing 2, the first terminal 10 is arranged on the side away from the step, and a positioning flange 8.2 is arranged at one end of the outer insulating collar 8 away from the second annular flange 8.1. The positioning flange 8.2 is fixedly installed on the end face of the bearing housing 2 through bolts, so as to realize the axial fixation of the outer insulating collar 8 and the bearing housing 2.

[0042] One end of the outer conductive uniform ring 9 away from the outer end face of the outer ring 7.1 of the insulating bearing 7 is provided with a voltage conducting cover 11 in contact with the inner end face of the outer ring 7.1 of the insulating bearing 7. One end of the voltage conducting cover 11 close to the inner end face of the outer ring 7.1 of the insulating bearing 7 is provided with a second terminal 12. Specifically, the voltage conducting cover 11 is of a stepped structure. The large diameter end of the voltage conducting cover 11 is fixedly connected with the outer insulating collar 8 through bolts, and the outer insulating collar 8 and the outer conductive uniform collar are pressed tightly, so as to realize the close fit between the surface of the outer conductive uniform collar and the insulating coating surface of the outer ring 7.1 of the insulating bearing 7 to achieve the full coverage of the outer ring 7.1 of the insulating bearing 7; the small diameter end of the voltage conducting cover 11 is provided with a third annular flange 11.1 abutting against the inner end face of the outer ring 7.1 of the insulating bearing 7, and the second terminal 12 is screwed into the threaded hole on the third annular flange 11.1. The second terminal 12 is preferably a copper slotted flat head screw, which is used to fixedly connect the wire of the insulation performance testing device.

[0043] The conductive slip ring 6 includes a rotor 6.1, a stator 6.2, and a flange-connected shaft 6.3. The rotor 6.1 of the conductive slip ring 6 is installed on the test end face of the rotating shaft 1 and rotates with the rotation of the rotating shaft 1. The rotor 6.1 of the conductive slip ring 6 is electrically connected to the inner ring 7.2 of the insulating bearing 7 through a wire; the stator 6.2 of the conductive slip ring 6 is fixedly installed in the bearing housing 2. Specifically, the rotor 6.1 of the conductive slip ring 6 is installed on the test end face of the rotating shaft 1 through the flange-connected shaft 6.3 and rotates synchronously with the rotation of the rotating shaft 1, realizing the synchronous rotation of the rotor 6.1 and the inner ring 7.2 of the insulating bearing 7. The rotor 6.1 of the conductive slip ring 6 is electrically connected to the third terminal 18 on the insulating bushing 16 through a wire, thereby realizing the electrical connection between the rotor 6.1 of the conductive slip ring 6 and the inner ring 7.2 of the insulating bearing 7; one end of the mounting flange of the stator 6.2 of the conductive slip ring 6 is fixedly installed on the fixed end cover 6.4 through bolts, and the fixed end cover 6.4 is fixedly installed on the annular flange on the inner wall of the bearing housing 2 through bolts. The conductive slip ring 6 preferably uses a through-hole conductive slip ring 6. The wire extends out of the test equipment through the wire outlet hole of the conductive slip ring 6. In the energized state, the flange slip ring connecting shaft 6.3 is connected to the main shaft, and the rotor 6.1 and the inner ring 7.2 of the insulating bearing 7 rotate synchronously; a wire passing hole is provided on the end face of the stator 6.2 of the conductive slip ring 6, so that the wire can extend out of the test equipment, realizing high-voltage transmission during the operation of the bearing and effectively testing the insulation performance of the insulating bearing 7.

[0044] Both the voltage loading device 19 and the insulation performance testing device are electrically connected to the inner ring 7.2 of the insulating bearing 7 through the conductive slip ring 6. Specifically, the two terminals of the voltage loading device 19 are electrically connected to the stator 6.2 of the conductive slip ring 6 and the outer ring 7.1 of the insulating bearing 7 through wires respectively.

[0045] As Figures 3 - 4 shown, in this embodiment, one end of the voltage loading device 19 is electrically connected to the first terminal 10 through a wire, thereby realizing the electrical connection with the outer ring 7.1 of the insulating bearing 7, and the other end is electrically connected to the stator 6.2 of the conductive slip ring 6 through a wire to realize its electrical connection with the inner ring 7.2 of the insulating bearing 7, finally forming a voltage loading circuit 41. When the rotor 6.1 of the conductive slip ring 6 rotates synchronously with the inner ring 7.2 of the insulating bearing 7 driven by the rotating shaft 1, high-voltage transmission during the operation of the bearing is realized. Specifically, the voltage loading device 19 in this embodiment is a voltage generator.

[0046] The insulation performance testing device includes a first testing device 20 for measuring the resistance of the outer ring 7.1 of the insulating bearing 7 during operation and a second testing device 21 for testing the resistance, current, and capacitance of the outer ring 7.1 and the inner ring 7.2 of the insulating bearing 7 during operation.

[0047] When measuring the insulation performance of the outer ring 7.1 of the insulated bearing 7, the two electrodes of the first testing device 20 are electrically connected to the first terminal 10 and the second terminal 12 at both end faces of the outer ring 7.1 of the insulated bearing 7 through wires respectively. Specifically, the first testing device 20 is an insulation resistance tester, which tests the resistance value of the outer ring 7.1 of the insulated bearing 7 during operation;

[0048] When measuring the insulation performance between the inner ring 7.2 of the insulated bearing 7 and the outer ring 7.1 of the insulated bearing 7, the two electrodes of the second testing device 21 are electrically connected to the stator 6.2 of the conductive slip ring 6 and the first terminal 10 through wires respectively. The second testing device 21 includes an insulation resistance tester, a capacitance meter, a digital display withstand voltage tester, a current tester, etc., and realizes the testing of the outer ring 7.1 of the inner insulated bearing 7 during operation. The testing parameters include resistance, current, capacitance, etc.

[0049] It should be noted that during measurement, the second testing device 21 and the voltage loading device 19 are connected in parallel between the stator 6.2 of the conductive slip ring 6 and the outer ring 7.1 of the insulated bearing 7. The insulation performance can be tested while the voltage is being loaded.

[0050] The radial loading device is used to apply a radial load to the rotating shaft 1, and includes a loading box 22 and two radial loading hydraulic cylinders 23. The loading box 22 is sleeved on the bearing seat 2; the two radial loading hydraulic cylinders 23 are symmetrically arranged on both sides of the loading box 22 perpendicular to the axial direction of the rotating shaft 1. Specifically, one end of each radial loading hydraulic cylinder 23 is hinged to the loading box 22, and the other end is hinged to the base 27.

[0051] In this embodiment, the front end of the loading box 22 and the front end of the bearing seat 2 are axially limited by a transition disk 24. The transition disk 24 is fixedly connected to the front end face of the bearing seat 2 by bolts. The outer circumferential surface of the transition disk 24 is in interference fit with the mounting holes on the front end face of the loading box 22. A flange disk connected to the loading box 22 is provided on the outer circumferential surface of the transition disk 24. Specifically, a number of axial through holes are evenly distributed on the flange disk, and a number of axial threaded holes corresponding to the through holes are provided on the front end face of the loading box 22. During installation, the bolts pass through the axial through holes on the flange disk and are screwed into the axial threaded holes on the front end face of the loading box 22; the rear end hole of the loading box 22 is sleeved on the flange 1.1 of the rotating shaft 1 with a clearance.

[0052] The axial loading device is used to apply an axial load to the insulated bearing 7 at the test end of the rotating shaft 1, and includes an axial loading hydraulic cylinder 28, a connecting plate 29 and a loading support seat 30. The axial loading hydraulic cylinder 28 is arranged parallel to the axial direction of the rotating shaft 1. A connecting plate 29 is provided on the lower side of the loading box 22. One end of the axial loading hydraulic cylinder 28 is hinged to the connecting plate 29, and the other end is hinged to the loading support seat 30 provided on the base 27.

[0053] In order to better cooperate with the bearing loading device to achieve axial loading and prevent the loading box 22 from tilting, this embodiment further includes an axial limiting device disposed outside the loading box 22. The axial limiting device is located at the top of the axial loading device and includes fixing seats 31 symmetrically arranged on the loading support base 30. A limiting ejector rod 32 is telescopically arranged in the cavity of each fixing seat 31. A set screw 33 for locking the limiting ejector rod 32 is arranged on the side wall of the cavity. The limiting ejector rod 32 axially abuts against the loading box 22. During use, the limiting ejector rod 32 cooperates with the axial loading hydraulic cylinder 28 for axial loading.

[0054] In this embodiment, the base 27 is slidably arranged on the bottom plate 34 along the axial direction of the rotating shaft 1 through a slide rail mechanism. An axial chute is formed on the upper surface of the bottom plate 34, and a slider adapted to the chute is arranged on the bottom surface of the base 27. The sliding arrangement of the base relative to the bottom plate facilitates the disassembly, assembly and positioning of the axial loading device and the radial loading device.

[0055] During testing, when testing the insulation performance of the insulated bearing 7, voltage loading, axial force loading and radial force loading are applied to the tested insulated bearing 7, and the motor is started to rotate the tested insulated bearing 7. During the operation of the bearing, the test parameters are recorded at regular intervals, the test data is analyzed, and the attenuation of the insulation performance of the insulated bearing 7 during long-term operation is summarized. Or the loading parameters are changed to observe the attenuation of the insulation performance of the insulated bearing 7 operating under different working conditions.

[0056] It should be noted that this embodiment adopts a dual loading method of voltage and mechanical (axial loading and radial loading), and at the same time cooperates with high-voltage transmission and voltage insulation to realize the insulation performance (resistance, current and capacitance) test of the outer ring 7.1 and the inner ring 7.2 of the insulated bearing 7 and the outer ring 7.1 of the insulated bearing 7.

[0057] The beneficial effects of this embodiment compared with the prior art are as follows:

[0058] 1) This embodiment adopts a dual-action device of mechanical loading and voltage loading, realizing a force loading and voltage dual-stress loading test, and capable of carrying out corresponding loading tests;

[0059] 2) The use of a high-voltage rotating-state transmission device in cooperation with voltage loading realizes voltage loading between the inner ring 7.2 (rotating race) and the outer ring 7.1 (stationary race), which is more in line with the voltage generation mechanism of the bearing compared with the loading of the inner or outer ring 7.1 alone;

[0060] 3) The use of a high-voltage transmission device in cooperation with an insulation performance test device (resistance, capacitance, impedance and current) realizes the capacitance and resistance characteristic tests of the inner ring 7.2 and the outer ring 7.1; in addition, combined with the test of the inner ring 7.2 or the outer ring 7.1 alone, the overall insulation performance test of the inner ring 7.2 and the outer ring 7.1 of the bearing is realized.

[0061] 4) By adopting inner and outer conductive evenly distributed collar rings, the insulating coatings on the surfaces of the inner and outer rings 7.1 of the bearing can be evenly attached to the evenly distributed collar rings. On the basis of realizing the voltage loading and full-coverage insulation performance test of the insulating bearing 7, conduction can be achieved on the surfaces of the inner and outer rings 7.1, so as to ensure that the measured insulation performance is the weak point among the measuring points, and realize the voltage loading and insulation performance test of the insulating bearing 7 during the working process.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "coaxial", "bottom", "top", "middle", "one end", "the other end", "both ends", "upper", "lower", "one side", "the other side", "inner", "outer", "front part", "center", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0063] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swiveling connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0064] In the description of the present invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0065] Although the embodiments of the present invention have been shown and described above, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Insulated bearing test equipment, characterized in that: Comprising: A rotating shaft, an inner ring of the insulating bearing is sleeved on a test end of the rotating shaft, and an inner ring insulating assembly is arranged between the inner ring of the insulating bearing and the rotating shaft; a bearing housing, an outer ring of the insulating bearing is sleeved in the bearing housing, and an outer ring insulating assembly is arranged between the outer ring of the insulating bearing and the bearing housing; a voltage loading device for applying a voltage load to the insulating bearing; and an insulation performance testing device for detecting the insulation performance of the insulating bearing; It further includes a conductive slip ring arranged on the test end of the rotating shaft. Both the voltage loading device and the insulation performance testing device are electrically connected to the inner ring of the insulating bearing through the conductive slip ring. A rotor of the conductive slip ring is installed on an end face of the test end of the rotating shaft and rotates with the rotation of the rotating shaft. The rotor of the conductive slip ring is electrically connected to the inner ring of the insulating bearing through a wire; a stator of the conductive slip ring is fixedly installed in the bearing housing; The insulation performance testing device includes a first testing device for measuring the resistance of the outer ring of the insulating bearing during operation and a second testing device for testing the resistance, current and capacitance of the outer ring and the inner ring of the insulating bearing during operation; It further includes a radial loading device for applying a radial load to the rotating shaft. The radial loading device includes: a loading box sleeved on the bearing housing; two radial loading hydraulic cylinders symmetrically arranged on both sides of the loading box perpendicular to the axial direction of the rotating shaft. One end of each radial loading hydraulic cylinder is hinged to the loading box, and the other end is hinged to a base; It further includes an axial loading device for applying an axial load to the rotating shaft. The axial loading device includes an axial loading hydraulic cylinder arranged parallel to the axial direction of the rotating shaft. A connecting plate is arranged on a lower side of the loading box. One end of the axial loading hydraulic cylinder is hinged to the connecting plate, and the other end is hinged to a loading support seat arranged on the base.

2. The insulation bearing test equipment according to claim 1, characterized in that: The base is arranged on the bottom plate in a slidable manner along the axial direction of the rotating shaft through a slide rail mechanism.

3. The insulation bearing test equipment according to claim 1, characterized in that: It further includes an axial limiting device arranged outside the loading box. The axial limiting device is located at the top of the axial loading device and includes fixed seats symmetrically arranged on the loading support seats, a limiting ejector rod telescopically arranged in a cavity of the fixed seat, a set screw arranged on a side wall of the cavity for locking the limiting ejector rod, and the limiting ejector rod axially abuts against the loading box.

4. The insulation bearing test equipment according to claim 1, characterized in that: The outer ring insulating assembly includes an outer insulating sleeve ring sleeved in the bearing housing, an outer conductive uniform distribution ring sleeved on the outer insulating sleeve ring and in contact with the outer ring of the insulating bearing. A first annular flange in contact with the outer end face of the outer ring of the insulating bearing is arranged at one end of the inner wall of the outer conductive uniform distribution ring close to the outer end face of the outer ring of the insulating bearing. A first wiring terminal is arranged on the first annular flange. A voltage guiding cover in contact with the inner end face of the outer ring of the insulating bearing is arranged at one end of the outer conductive uniform distribution ring away from the outer end face of the outer ring of the insulating bearing. A second wiring terminal is arranged at one end of the voltage guiding cover close to the inner end face of the insulating bearing.

5. The insulation bearing test equipment according to claim 1, characterized in that: The inner ring insulation assembly includes an inner insulation collar sleeved on the test end of the rotating shaft, an inner conductive uniform distribution ring sleeved inside the inner insulation collar and in contact with the insulation layer of the inner ring of the insulated bearing. One end of the inner conductive uniform distribution ring close to the outer end face of the inner ring of the insulated bearing is sleeved with a conductive washer in contact with the outer end face of the inner ring of the insulated bearing. The conductive washer is fixed by a compression nut. An insulation bush is arranged between the conductive washer and the compression nut. A third wiring terminal connected to the conductive washer is arranged on the insulation bush.

6. The insulation bearing test equipment according to any one of claims 1-5, characterized in that: It further includes a main shaft driving mechanism. The rotating shaft is connected to the main shaft in the main shaft driving mechanism, and the main shaft in the main shaft driving mechanism drives the rotating shaft to rotate.

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