Quantitative testing device for electric corrosion of motor bearing body by simulating actual working condition

Abstract

A motor bearing body electro-corrosion quantitative testing device simulating actual working conditions comprises a computer, a data acquisition instrument, a shaft voltage generator and the like. The data acquisition instrument, the computer and the shaft voltage generator are electrically connected, the anode of the shaft voltage generator is electrically connected with the conductive slip ring outer ring through the rheostat, the conductive slip ring inner ring is coaxially and fixedly connected with the main shaft, and the cathode of the shaft voltage generator is grounded; the motor is coaxially and fixedly connected with the main shaft through a magnetic coupling; the frequency converter is electrically connected with the motor and the computer; the main shaft supporting unit is arranged between the main shaft and the base; the inner ring of the test bearing is fixedly sleeved on the main shaft; the radial load applying unit is arranged between the outer ring of the test bearing and the base, and the radial load applying unit is grounded; the lubricating unit is arranged between the test bearing and the main shaft; and the axial load applying unit is arranged between the outer ring of the test bearing and the base. According to the invention, actual working conditions such as different rotating speeds, different voltages, different axial loads, different radial loads, different lubricating oil temperatures and different lubrication types can be simulated.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring electric corrosion of motor bearings, and particularly relates to a device for quantitatively testing electric corrosion of a motor bearing body that simulates actual working conditions. Background Art

[0002] With the rapid development of frequency conversion technology, in modern motor drive technology, due to the advantage of energy conservation of frequency converters, frequency conversion drive technology has been widely applied.

[0003] However, in the motor frequency conversion drive technology, the phenomenon of electric corrosion of motor bearings caused by switch power supply is becoming increasingly prominent. When the frequency converter uses PWM technology to control the motor, the rise time of its fast switching device IGBT is very short, which will generate a high dv / dt, resulting in a common-mode voltage at the output end of the frequency converter. This is an important reason for the electric corrosion of motor bearings and is also a common problem in the operation of frequency conversion drive technology in motors.

[0004] Currently, in the fields of new energy vehicle drive motors and rail transit drive motors, etc., the problem of electric corrosion of motor bearings has received more and more attention. Electric corrosion will not only cause serious damage to the bearing body but also pose a safety hazard to the safe operation of the equipment.

[0005] Although the research on the phenomenon of electric corrosion of motor bearings at home and abroad started at different times, no systematic and perfect industry standard system has been formed. The research results mainly focus on the description of phenomena, with obvious deficiencies in theoretical demonstration, and the experimental verification carried out is also less and has obvious limitations.

[0006] For example, the Chinese patent application with the publication number CN114217223A discloses a test platform for simulating the shaft current damage of an insulating bearing of an industrial frequency conversion motor, the Chinese patent application with the publication number CN105486506A discloses a test device for simulating the shaft current damage of a motor bearing, the Chinese patent application with the publication number CN105699081A discloses a comprehensive performance experimental device for bearing shaft current damage, and the Chinese patent application with the publication number CN113899685A discloses an electric corrosion damage test device applicable to multiple models of bearings. In the above patent applications, only the radial load working condition is considered, and the actual working condition under axial load is not considered. In addition, the Chinese patent application with the publication number CN112748059A discloses a test platform for the electric corrosion life of a motor bearing. Although the axial load working condition is considered, this axial load is loaded on the test bearing through the combined action of a rotating main shaft and a ceramic bearing. This axial load method is prone to cause the position deviation of the main shaft, is not easy to linearly load the load, and the ceramic bearing has the disadvantages of low impact resistance, being fragile, high cost, difficult to process, and large vibration and noise. Therefore, it cannot meet the loading requirements of high loads and will also affect the detection of vibration acceleration.

[0007] In addition, the above patent application also has the following problems: ①. In the solution, an exposed brush is used to load the shaft voltage, which has problems of poor durability, cumbersome replacement and maintenance; ②. The insulation problem of the coupling in the solution is not considered enough. Although some couplings are provided with an insulating coating between the rotating shaft of the driving motor and the rotating shaft of the test bearing, there is still electric field coupling, and the shaft voltage of the driving motor part will still be coupled to the measured bearing, thus affecting the accuracy of the measurement result; ③. The solution does not consider different lubrication conditions, such as technical problems of lubricating the test bearing with lubricating oil and oil seals. Summary of the Invention

[0008] Aiming at the problems existing in the prior art, the present invention provides a device for quantitatively testing the electrical corrosion of a motor bearing body that simulates actual working conditions, which can simulate actual working conditions such as different rotational speeds, different voltages, different axial loads, different radial loads, different lubricating oil temperatures, and different lubrication types, uses a magnetic coupling to solve the insulation problem to improve the accuracy of the measurement result, and uses a closed slip ring structure to solve the problems of poor durability, cumbersome replacement and maintenance existing in the exposed brush structure.

[0009] To achieve the above object, the present invention adopts the following technical solution: A device for quantitatively testing the electrical corrosion of a motor bearing body that simulates actual working conditions, comprising a computer, a data acquisition instrument, a shaft voltage generator, a rheostat, a conductive slip ring, a motor, an inverter, a magnetic coupling, a main shaft, a base, a test bearing, a main shaft support unit, a radial load application unit, an axial load application unit, and a lubrication unit; the signal output end of the data acquisition instrument is electrically connected to the computer; the control end of the shaft voltage generator is electrically connected to the computer, the positive pole of the shaft voltage generator is electrically connected to the outer ring of the conductive slip ring through the rheostat, the signal output end of the outer ring of the conductive slip ring is electrically connected to the signal input end of the data acquisition instrument, the inner ring of the conductive slip ring is coaxially and fixedly connected to the main shaft, and the negative pole of the shaft voltage generator is grounded; the motor is horizontally and fixedly installed on the base through a motor mounting seat, and the motor shaft of the motor is coaxially and fixedly connected to the main shaft through a magnetic coupling; the inverter is fixedly installed on the base, the signal output end of the inverter is electrically connected to the signal input end of the motor, and the control end of the inverter is electrically connected to the computer; the main shaft support unit is arranged between the main shaft and the base, and the main shaft support unit is adjacent to the magnetic coupling; the inner ring of the test bearing is fixedly sleeved on the main shaft, and the test bearing is adjacent to the main shaft support unit; the radial load application unit is arranged between the outer ring of the test bearing and the base, and the radial load application unit is grounded; the lubrication unit is arranged between the test bearing and the main shaft; the axial load application unit is arranged between the outer ring of the test bearing and the base.

[0010] The conductive loop of the shaft voltage is: ground → negative pole of the shaft voltage generator → positive pole of the shaft voltage generator → rheostat → outer ring of the conductive slip ring → inner ring of the conductive slip ring → main shaft → test bearing → radial load application unit → ground.

[0011] The main shaft support unit includes a first support bearing, a first bearing housing, a second support bearing, a second bearing housing, a reinforcement support base, and a dust-proof cover plate; the first support bearing and the second support bearing are arranged in parallel; the inner ring of the first support bearing is fixedly sleeved on the main shaft, the outer ring of the first support bearing is fixed in the first bearing housing, and the first bearing housing is fixedly installed on the base; the inner ring of the second support bearing is fixedly sleeved on the main shaft, the outer ring of the second support bearing is fixed in the second bearing housing, and the second bearing housing is fixedly installed on the base; the reinforcement support base is located between the first bearing housing and the second bearing housing, and the reinforcement support base is fixedly installed on the base; the dust-proof cover plate is horizontally and fixedly installed at the top of the first bearing housing, the second bearing housing, and the reinforcement support base.

[0012] The radial load application unit includes a radial loading oil cylinder, a radial force measuring sensor, a radial pressure-bearing pad, a radial load oil pump, a radial load controller, and a radial load force transmission seat; the radial load force transmission seat is fixedly sleeved on the outer side of the outer ring of the test bearing; the radial loading oil cylinder is located directly below the test bearing, and the radial loading oil cylinder is fixedly installed on the base; the radial force measuring sensor is located at the top of the piston rod of the radial loading oil cylinder, and the radial pressure-bearing pad is located between the radial force measuring sensor and the radial load force transmission seat; the radial load oil pump is connected to the radial loading oil cylinder through an oil circuit, the control end of the radial load oil pump is electrically connected to the radial load controller, the signal input end of the radial load controller is electrically connected to the signal output end of the radial force measuring sensor, and the signal output end of the radial force measuring sensor is simultaneously electrically connected to the signal input end of the data acquisition instrument; the radial load application unit is grounded through the radial load force transmission seat.

[0013] A vibration acceleration sensor is fixedly installed on the radial load force transmission seat, and the signal output end of the vibration acceleration sensor is electrically connected to the signal input end of the data acquisition instrument.

[0014] The lubrication unit includes a lubricating oil seal cylinder, a lubricating oil seal cover, a bushing, a double-lip oil seal and a cylinder support seat; the end of the main shaft is covered by the lubricating oil seal cylinder, and the cylinder body of the lubricating oil seal cylinder is coaxially distributed with the main shaft; the cylinder support seat is located between the cylinder body of the lubricating oil seal cylinder and the base, the cylinder support seat is fixedly installed on the base, and the cylinder support seat is in sliding contact and cooperation with the cylinder body of the lubricating oil seal cylinder; the cylinder opening of the lubricating oil seal cylinder abuts against the outer ring of the test bearing, and an O-ring seal is arranged between the abutting contact surface of the cylinder opening of the lubricating oil seal cylinder and the outer ring of the test bearing; the bushing is located between the test bearing and the main shaft support unit and is sleeved on the main shaft; the double-lip oil seal is fixedly sleeved on the bushing and is in sliding and sealing contact and cooperation with the main shaft; the lubricating oil seal cover is fixedly sleeved on the double-lip oil seal and is fixedly connected with the radial load transfer seat, and an O-ring seal is arranged between the contact surface of the lubricating oil seal cover and the radial load transfer seat.

[0015] A lubricating oil inlet and a lubricating oil outlet are respectively arranged on the cylinder body of the lubricating oil seal cylinder, and a lubricating oil circulation pump and a lubricating oil temperature controller are arranged outside the lubricating oil seal cylinder; a temperature sensor is fixedly installed on the radial load transfer seat, the signal output end of the temperature sensor is electrically connected to the signal input end of the data acquisition instrument, and the signal output end of the temperature sensor is simultaneously electrically connected to the signal input end of the lubricating oil temperature controller; the oil outlet of the lubricating oil circulation pump is connected to the lubricating oil inlet on the cylinder body of the lubricating oil seal cylinder through the lubricating oil temperature controller, and the oil inlet of the lubricating oil circulation pump is connected to the lubricating oil outlet on the cylinder body of the lubricating oil seal cylinder.

[0016] The end of the main shaft penetrates through the bottom plate of the lubricating oil seal cylinder, and an O-ring seal is arranged between the main shaft and the central through hole of the bottom plate of the lubricating oil seal cylinder; the inner ring of the conductive slip ring is coaxially fixedly installed on the end of the main shaft, and the outer ring of the conductive slip ring is fixedly embedded on the bottom plate of the lubricating oil seal cylinder; a wire threading hole is opened in the side wall of the cylinder body of the lubricating oil seal cylinder, and the wire between the outer ring of the conductive slip ring and the rheostat is led out of the lubricating oil seal cylinder through the wire threading hole; a conductive slip ring cover is threadedly sleeved on the outer side of the bottom of the lubricating oil seal cylinder.

[0017] The axial load application unit includes an axial loading oil cylinder, an axial force measuring sensor, an axial ejector rod, an axial load oil pump, an axial load controller, an ejector rod support seat, an oil cylinder support seat, a force measuring sensor support plate, and a stable support seat; the ejector rod support seat is fixedly installed on the base; the axial ejector rod is coaxially distributed with the main shaft, the axial ejector rod passes through the guiding optical hole on the ejector rod support seat, the axial ejector rod is in sliding contact fit with the guiding optical hole, and one end of the axial ejector rod is fixedly connected by screwing to the conductive slip ring cover; the oil cylinder support seat is fixedly installed on the base; the axial loading oil cylinder is fixedly installed on the oil cylinder support seat, and the piston rod of the axial loading oil cylinder is coaxially distributed with the main shaft; the axial force measuring sensor is located between the other end of the axial ejector rod and the piston rod of the axial loading oil cylinder; the force measuring sensor support plate is horizontally and fixedly installed between the ejector rod support seat and the oil cylinder support seat; the axial force measuring sensor is in sliding contact fit with the upper surface of the force measuring sensor support plate; the stable support seat abuts against the oil cylinder support seat, and the stable support seat is fixedly installed on the base.

[0018] Advantages of the present invention:

[0019] The motor bearing body electro-corrosion quantitative test device of the present invention for simulating actual working conditions can simulate actual working conditions such as different rotational speeds, different voltages, different axial loads, different radial loads, different lubricating oil temperatures, different lubrication types, etc., and has important reference value for related research on bearing discharge breakdown mechanism and service life, etc.

[0020] The motor bearing body electro-corrosion quantitative test device of the present invention for simulating actual working conditions uses a magnetic coupling to solve the insulation problem to improve the accuracy of measurement results. The magnetic coupling has advantages such as low noise, high transmission accuracy, and high reliability, and uses the magnetic field effect to transmit torque, realizing complete insulation between the motor shaft of the motor and the rotating main shaft, and avoiding the interference of shaft current flowing into the motor to the motor.

[0021] The motor bearing body electro-corrosion quantitative test device of the present invention for simulating actual working conditions can directly apply loads to the test bearing through the radial load application unit and the axial load application unit, making the test working conditions of the test bearing closer to the actual working conditions.

[0022] The motor bearing body electro-corrosion quantitative test device of the present invention for simulating actual working conditions can simulate different lubrication types for the test bearing through the lubrication unit, and can simultaneously adjust the temperature of the lubricating oil in real time, which is of great significance for carrying out research on the relationship between bearing electro-corrosion and lubrication type, bearing service life and other factors.

[0023] The motor bearing body electro-corrosion quantitative test device of the present invention for simulating actual working conditions uses a closed slip ring structure to solve the problems of poor durability, cumbersome replacement and maintenance existing in the exposed brush structure. Description of the drawings

[0024] Figure 1 Schematic diagram of the overall structure of the device for quantitatively testing the electrical corrosion of the motor bearing body simulating actual working conditions according to the present invention;

[0025] Figure 2 Schematic diagram of the partial structure of the device for quantitatively testing the electrical corrosion of the motor bearing body simulating actual working conditions according to the present invention;

[0026] Figure 3 Schematic diagram of the partial structure of the main shaft support unit of the device for quantitatively testing the electrical corrosion of the motor bearing body simulating actual working conditions according to the present invention;

[0027] Figure 4 Schematic diagram of the partial structure of the radial load applying unit and the lubrication unit of the device for quantitatively testing the electrical corrosion of the motor bearing body simulating actual working conditions according to the present invention (viewpoint one);

[0028] Figure 5 Schematic diagram of the partial structure of the radial load applying unit and the lubrication unit of the device for quantitatively testing the electrical corrosion of the motor bearing body simulating actual working conditions according to the present invention (viewpoint two);

[0029] In the figure, 1 - computer, 2 - data acquisition instrument, 3 - shaft voltage generator, 4 - rheostat, 5 - conductive slip ring, 6 - motor, 7 - frequency converter, 8 - magnetic coupling, 9 - main shaft, 10 - base, 11 - test bearing, 12 - motor mounting seat, 13 - first support bearing, 14 - first bearing seat, 15 - second support bearing, 16 - second bearing seat, 17 - reinforcement support seat, 18 - dust-proof cover plate, 19 - radial loading oil cylinder, 20 - radial force measuring sensor, 21 - radial pressure bearing pad, 22 - radial load oil pump, 23 - radial load controller, 24 - radial load transfer seat, 25 - vibration acceleration sensor, 26 - lubricating oil seal cylinder, 27 - lubricating oil seal cover, 28 - shaft sleeve, 29 - double-lip oil seal, 30 - seal cylinder support seat, 31 - lubricating oil inlet, 32 - lubricating oil outlet, 33 - lubricating oil circulation pump, 34 - lubricating oil temperature controller, 35 - temperature sensor, 36 - wire threading hole, 37 - conductive slip ring cover, 38 - axial loading oil cylinder, 39 - axial force measuring sensor, 40 - axial ejector rod, 41 - axial load oil pump, 42 - axial load controller, 43 - ejector rod support seat, 44 - oil cylinder support seat, 45 - force measuring sensor support plate, 46 - stable support seat. Detailed implementation manners

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] As Figures 1 to 5As shown in the figure, a quantitative test device for electric corrosion of a motor bearing body simulating actual working conditions includes a computer 1, a data acquisition instrument 2, an axial voltage generator 3, a rheostat 4, a conductive slip ring 5, a motor 6, a frequency converter 7, a magnetic coupling 8, a main shaft 9, a base 10, a test bearing 11, a main shaft support unit, a radial load application unit, an axial load application unit, and a lubrication unit; the signal output end of the data acquisition instrument 2 is electrically connected to the computer 1; the control end of the axial voltage generator 3 is electrically connected to the computer 1, the positive pole of the axial voltage generator 3 is electrically connected to the outer ring of the conductive slip ring 5 through the rheostat 4, the signal output end of the outer ring of the conductive slip ring 5 is electrically connected to the signal input end of the data acquisition instrument 2, the inner ring of the conductive slip ring 5 is coaxially and fixedly connected to the main shaft 9, and the negative pole of the axial voltage generator 3 is grounded; the motor 6 is horizontally and fixedly installed on the base 10 through a motor mounting seat 12, and the motor shaft of the motor 6 is coaxially and fixedly connected to the main shaft 9 through the magnetic coupling 8; the frequency converter 7 is fixedly installed on the base 10, the signal output end of the frequency converter 7 is electrically connected to the signal input end of the motor 6, and the control end of the frequency converter 7 is electrically connected to the computer 1; the main shaft support unit is arranged between the main shaft 9 and the base 10 and is adjacent to the magnetic coupling 8; the inner ring of the test bearing 11 is fixedly sleeved on the main shaft 9 and is adjacent to the main shaft support unit; the radial load application unit is arranged between the outer ring of the test bearing 11 and the base 10 and the radial load application unit is grounded; the lubrication unit is arranged between the test bearing 11 and the main shaft 9; the axial load application unit is arranged between the outer ring of the test bearing 11 and the base 10.

[0032] The conductive circuit of the axial voltage is: ground → negative pole of the axial voltage generator 3 → positive pole of the axial voltage generator 3 → rheostat 4 → outer ring of the conductive slip ring 5 → inner ring of the conductive slip ring 5 → main shaft 9 → test bearing 11 → radial load application unit → ground.

[0033] The main shaft support unit includes a first support bearing 13, a first bearing seat 14, a second support bearing 15, a second bearing seat 16, a reinforcement support seat 17, and a dust cover 18; the first support bearing 13 and the second support bearing 15 are arranged in parallel; the inner ring of the first support bearing 13 is fixedly sleeved on the main shaft 9, the outer ring of the first support bearing 13 is fixed in the first bearing seat 14, and the first bearing seat 14 is fixedly installed on the base 10; the inner ring of the second support bearing 15 is fixedly sleeved on the main shaft 9, the outer ring of the second support bearing 15 is fixed in the second bearing seat 16, and the second bearing seat 16 is fixedly installed on the base 10; the reinforcement support seat 17 is located between the first bearing seat 14 and the second bearing seat 16, and the reinforcement support seat 17 is fixedly installed on the base 10; the dust cover 18 is horizontally and fixedly installed on the tops of the first bearing seat 14, the second bearing seat 16, and the reinforcement support seat 17.

[0034] The radial load applying unit includes a radial loading oil cylinder 19, a radial force measuring sensor 20, a radial bearing pressure pad 21, a radial load oil pump 22, a radial load controller 23 and a radial load force transmission seat 24; the radial load force transmission seat 24 is fixedly sleeved on the outer side of the outer ring of the test bearing 11; the radial loading oil cylinder 19 is located directly below the test bearing 11, and the radial loading oil cylinder 19 is fixedly installed on the base 10; the radial force measuring sensor 20 is located at the top end of the piston rod of the radial loading oil cylinder 19, and the radial bearing pressure pad 21 is located between the radial force measuring sensor 20 and the radial load force transmission seat 24; the radial load oil pump 22 is connected to the radial loading oil cylinder 19 through an oil circuit, the control end of the radial load oil pump 22 is electrically connected to the radial load controller 23, the signal input end of the radial load controller 23 is electrically connected to the signal output end of the radial force measuring sensor 20, and the signal output end of the radial force measuring sensor 20 is simultaneously electrically connected to the signal input end of the data acquisition instrument 2; the radial load applying unit is grounded through the radial load force transmission seat 24.

[0035] A vibration acceleration sensor 25 is fixedly installed on the radial load force transmission seat 24, and the signal output end of the vibration acceleration sensor 25 is electrically connected to the signal input end of the data acquisition instrument 2.

[0036] The lubrication unit includes a lubricating oil seal cylinder 26, a lubricating oil seal cover 27, a bushing 28, a double-lip oil seal 29 and a seal cylinder support seat 30; the end of the main shaft 9 is covered by the lubricating oil seal cylinder 26, and the cylinder body of the lubricating oil seal cylinder 26 is coaxially distributed with the main shaft 9; the seal cylinder support seat 30 is located between the cylinder body of the lubricating oil seal cylinder 26 and the base 10, the seal cylinder support seat 30 is fixedly installed on the base 10, and the seal cylinder support seat 30 is in sliding contact and cooperation with the cylinder body of the lubricating oil seal cylinder 26; the mouth of the lubricating oil seal cylinder 26 abuts against the outer ring of the test bearing 11, and an O-ring seal is provided between the abutting contact surface of the mouth of the lubricating oil seal cylinder 26 and the outer ring of the test bearing 11; the bushing 28 is located between the test bearing 11 and the main shaft support unit and is sleeved on the main shaft 9; the double-lip oil seal 29 is fixedly sleeved on the bushing 28 and is in sliding and sealing contact and cooperation with the main shaft 9; the lubricating oil seal cover 27 is fixedly sleeved on the double-lip oil seal 29 and is fixedly connected to the radial load force transmission seat 24, and an O-ring seal is provided between the contact surface of the lubricating oil seal cover 27 and the radial load force transmission seat 24.

[0037] A lubricating oil inlet 31 and a lubricating oil outlet 32 are respectively arranged on the cylinder body of the lubricating oil seal cylinder 26. A lubricating oil circulation pump 33 and a lubricating oil temperature controller 34 are arranged outside the lubricating oil seal cylinder 26. A temperature sensor 35 is fixedly installed on the radial load transfer seat 24. The signal output end of the temperature sensor 35 is electrically connected to the signal input end of the data acquisition instrument 2, and the signal output end of the temperature sensor 35 is also electrically connected to the signal input end of the lubricating oil temperature controller 34. The oil outlet of the lubricating oil circulation pump 33 is communicated with the lubricating oil inlet 31 on the cylinder body of the lubricating oil seal cylinder 26 through the lubricating oil temperature controller 34, and the oil inlet of the lubricating oil circulation pump 33 is communicated with the lubricating oil outlet 32 on the cylinder body of the lubricating oil seal cylinder 26.

[0038] The end of the main shaft 9 penetrates through the bottom plate of the lubricating oil seal cylinder 26. An O-ring seal is arranged between the main shaft 9 and the central through hole of the bottom plate of the lubricating oil seal cylinder 26. The inner ring of the conductive slip ring 5 is coaxially fixed on the end of the main shaft 9, and the outer ring of the conductive slip ring 5 is fixedly embedded on the bottom plate of the lubricating oil seal cylinder 26. A wire threading hole 36 is formed in the side wall of the cylinder body of the lubricating oil seal cylinder 26. The wire between the outer ring of the conductive slip ring 5 and the rheostat 4 is led out of the lubricating oil seal cylinder 26 through the wire threading hole 36. A conductive slip ring cover 37 is threadedly sleeved on the outer side of the bottom of the lubricating oil seal cylinder 26.

[0039] The axial load application unit includes an axial loading oil cylinder 38, an axial force measuring sensor 39, an axial ejector rod 40, an axial load oil pump 41, an axial load controller 42, an ejector rod support seat 43, an oil cylinder support seat 44, a force measuring sensor support plate 45 and a stable support seat 46. The ejector rod support seat 43 is fixedly installed on the base 10. The axial ejector rod 40 is coaxially distributed with the main shaft 9. The axial ejector rod 40 passes through the guiding optical hole on the ejector rod support seat 43, and the axial ejector rod 40 is in sliding contact fit with the guiding optical hole. One end of the axial ejector rod 40 is fixedly screwed on the conductive slip ring cover 37. The oil cylinder support seat 44 is fixedly installed on the base 10. The axial loading oil cylinder 38 is fixedly installed on the oil cylinder support seat 44, and the piston rod of the axial loading oil cylinder 38 is coaxially distributed with the main shaft 9. The axial force measuring sensor 39 is located between the other end of the axial ejector rod 40 and the piston rod of the axial loading oil cylinder 38. The force measuring sensor support plate 45 is horizontally fixedly installed between the ejector rod support seat 43 and the oil cylinder support seat 44. The axial force measuring sensor 39 is in sliding contact fit with the upper surface of the force measuring sensor support plate 45. The stable support seat 46 is in abutting contact with the oil cylinder support seat 44, and the stable support seat 46 is fixedly installed on the base 10.

[0040] The following describes a usage process of the present invention with reference to the accompanying drawings:

[0041] Start the axial load oil pump 41 to drive the piston rod of the axial loading cylinder 38 to extend. The thrust force output by the piston rod of the axial loading cylinder 38 is successively applied to the outer ring of the test bearing 11 through the axial force measuring sensor 39, the axial ejector rod 40, the conductive slip ring cover 37 and the lubricating oil seal cylinder 26. During the axial load application process, the axial load force data of the axial force measuring sensor 39 is fed back to the axial load controller 42 in real time. The axial load controller 42 will control the output power of the axial load oil pump 41 according to the fed-back axial load force data, and then control the axial load force output of the axial loading cylinder 38 to achieve the regulation of different axial loads.

[0042] Start the radial load oil pump 22 to drive the piston rod of the radial loading cylinder 19 to extend. The thrust force output by the piston rod of the radial loading cylinder 19 is successively applied to the outer ring of the test bearing 11 through the radial force measuring sensor 20, the radial bearing pad 21 and the radial load transfer seat 24. During the radial load application process, the radial load force data of the radial force measuring sensor 20 is fed back to the radial load controller 23 in real time. The radial load controller 23 will control the output power of the radial load oil pump 22 according to the fed-back radial load force data, and then control the radial load force output of the radial loading cylinder 19 to achieve the regulation of different axial loads.

[0043] Start the lubricating oil circulation pump 33 and the lubricating oil temperature controller 34 to make the lubricating oil for lubricating the test bearing 11 circulate in the lubricating oil circulation pump 33, the lubricating oil temperature controller 34 and the lubricating oil seal cylinder 26. The lubricating oil completes the temperature adjustment when flowing through the lubricating oil temperature controller 34. The temperature data of the temperature sensor 35 is fed back to the lubricating oil temperature controller 34 in real time. The lubricating oil temperature controller 34 will control the real-time temperature of the lubricating oil according to the fed-back temperature data, and then achieve the regulation of different lubricating oil temperatures. When it is necessary to adjust the lubrication type, the lubricating oil circulation pump 33 and the lubricating oil temperature controller 34 can be turned off to make the lubricating oil in a non-flowing state, and the test bearing 11 is lubricated only by the lubricating oil statically stored in the lubricating oil seal cylinder 26.

[0044] Start the shaft voltage generator 3 to connect the shaft voltage conduction loop of "ground → negative pole of the shaft voltage generator 3 → positive pole of the shaft voltage generator 3 → rheostat 4 → outer ring of the conductive slip ring 5 → inner ring of the conductive slip ring 5 → main shaft 9 → test bearing 11 → radial load application unit → ground" to simulate the electrical corrosion situation at the test bearing 11.

[0045] Start the motor 6, drive the main shaft 9 to rotate through the magnetic coupling 8, and at the same time control the speed of the motor 6 through the frequency converter 7. The data acquisition instrument 2 uniformly collects the axial load force data, radial load force data, lubricating oil temperature data, vibration acceleration data, and the discharge power and number of the test bearing 11 under the shaft voltage. The collected data are summarized and transmitted to the computer 1, and the computer 1 analyzes the index data to measure the electrical corrosion intensity of the test bearing 11.

[0046] After the test, the motor 6 is turned off first, then the radial load is unloaded, and finally the axial load is unloaded. If the lubricating oil adopts a circulating temperature control mode during the test, the lubricating oil circulation pump 33 and the lubricating oil temperature controller 34 are turned off before unloading the radial load.

[0047] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims

1. An electric corrosion quantitative test device for the motor bearing body simulating actual working conditions, characterized in that: It includes a computer, a data collector, a shaft voltage generator, a rheostat, a conductive slip ring, a motor, a frequency converter, a magnetic coupling, a main shaft, a base, a test bearing, a main shaft support unit, a radial load application unit, an axial load application unit and a lubrication unit; the signal output end of the data collector is electrically connected to the computer; the control end of the shaft voltage generator is electrically connected to the computer, the positive pole of the shaft voltage generator is electrically connected to the outer ring of the conductive slip ring through the rheostat, the signal output end of the outer ring of the conductive slip ring is electrically connected to the signal input end of the data collector, the inner ring of the conductive slip ring is coaxially and fixedly connected to the main shaft, and the negative pole of the shaft voltage generator is grounded; the motor is horizontally and fixedly installed on the base through a motor mounting seat, and the motor shaft of the motor is coaxially and fixedly connected to the main shaft through a magnetic coupling; the frequency converter is fixedly installed on the base, the signal output end of the frequency converter is electrically connected to the signal input end of the motor, and the control end of the frequency converter is electrically connected to the computer; the main shaft support unit is arranged between the main shaft and the base, and the main shaft support unit is adjacent to the magnetic coupling; the inner ring of the test bearing is fixedly sleeved on the main shaft, and the test bearing is adjacent to the main shaft support unit; the radial load application unit is arranged between the outer ring of the test bearing and the base, and the radial load application unit is grounded; the lubrication unit is arranged between the test bearing and the main shaft; the axial load application unit is arranged between the outer ring of the test bearing and the base.

2. The quantitative testing device for electric corrosion of the motor bearing body simulating actual working conditions according to claim 1, wherein: The conductive circuit of the shaft voltage is: ground → negative pole of the shaft voltage generator → positive pole of the shaft voltage generator → rheostat → outer ring of the conductive slip ring → inner ring of the conductive slip ring → main shaft → test bearing → radial load application unit → ground.

3. An electric corrosion quantitative testing device for a motor bearing body simulating actual working conditions according to claim 1, characterized in that: The main shaft support unit includes a first support bearing, a first bearing seat, a second support bearing, a second bearing seat, a reinforcement support seat and a dust cover; the first support bearing and the second support bearing are arranged in parallel; the inner ring of the first support bearing is fixedly sleeved on the main shaft, the outer ring of the first support bearing is fixed in the first bearing seat, and the first bearing seat is fixedly installed on the base; the inner ring of the second support bearing is fixedly sleeved on the main shaft, the outer ring of the second support bearing is fixed in the second bearing seat, and the second bearing seat is fixedly installed on the base; the reinforcement support seat is located between the first bearing seat and the second bearing seat, and the reinforcement support seat is fixedly installed on the base; the dust cover is horizontally and fixedly installed on the tops of the first bearing seat, the second bearing seat and the reinforcement support seat.

4. An electric corrosion quantitative test device for a motor bearing body simulating actual working conditions according to claim 1, characterized in that: The radial load application unit includes a radial loading oil cylinder, a radial force measuring sensor, a radial bearing pad, a radial load oil pump, a radial load controller and a radial load force transmission seat; the radial load force transmission seat is fixedly sleeved on the outer side of the outer ring of the test bearing; the radial loading oil cylinder is located directly below the test bearing, and the radial loading oil cylinder is fixedly installed on the base; the radial force measuring sensor is located at the top of the piston rod of the radial loading oil cylinder, and the radial bearing pad is located between the radial force measuring sensor and the radial load force transmission seat; the radial load oil pump is connected to the radial loading oil cylinder through an oil circuit, the control end of the radial load oil pump is electrically connected to the radial load controller, the signal input end of the radial load controller is electrically connected to the signal output end of the radial force measuring sensor, and the signal output end of the radial force measuring sensor is simultaneously electrically connected to the signal input end of the data acquisition instrument; the radial load application unit is grounded through the radial load force transmission seat.

5. An electric corrosion quantitative testing device for a motor bearing body simulating actual working conditions according to claim 4, characterized in that: A vibration acceleration sensor is fixedly installed on the radial load force transmission seat, and the signal output end of the vibration acceleration sensor is electrically connected to the signal input end of the data acquisition instrument.

6. The quantitative test device for electric corrosion of the motor bearing body simulating actual working conditions according to claim 4, characterized in that: The lubrication unit includes a lubricating oil seal cylinder, a lubricating oil seal cover, a sleeve, a double-lip oil seal and a seal cylinder support seat; the end of the main shaft is covered by the lubricating oil seal cylinder, and the cylinder body of the lubricating oil seal cylinder is coaxially distributed with the main shaft; the seal cylinder support seat is located between the cylinder body of the lubricating oil seal cylinder and the base, the seal cylinder support seat is fixedly installed on the base, and the seal cylinder support seat is in sliding contact and cooperation with the cylinder body of the lubricating oil seal cylinder; the cylinder mouth of the lubricating oil seal cylinder abuts against the outer ring of the test bearing, and an O-ring seal is provided between the abutting contact surface of the cylinder mouth of the lubricating oil seal cylinder and the outer ring of the test bearing; the sleeve is located between the test bearing and the main shaft support unit and is sleeved on the main shaft; the double-lip oil seal is fixedly sleeved on the sleeve and is in sliding seal contact and cooperation with the main shaft; the lubricating oil seal cover is fixedly sleeved on the double-lip oil seal and is fixedly connected to the radial load force transmission seat, and an O-ring seal is provided between the contact surface of the lubricating oil seal cover and the radial load force transmission seat.

7. An electric corrosion quantitative testing device for a motor bearing body simulating actual working conditions according to claim 6, characterized in that: A lubricating oil inlet and a lubricating oil outlet are respectively provided on the cylinder body of the lubricating oil seal cylinder, and a lubricating oil circulation pump and a lubricating oil temperature controller are provided outside the lubricating oil seal cylinder; a temperature sensor is fixedly installed on the radial load force transmission seat, the signal output end of the temperature sensor is electrically connected to the signal input end of the data acquisition instrument, and the signal output end of the temperature sensor is simultaneously electrically connected to the signal input end of the lubricating oil temperature controller; the oil outlet of the lubricating oil circulation pump is connected to the lubricating oil inlet on the cylinder body of the lubricating oil seal cylinder through the lubricating oil temperature controller, and the oil inlet of the lubricating oil circulation pump is connected to the lubricating oil outlet on the cylinder body of the lubricating oil seal cylinder.

8. The quantitative test device for electric corrosion of the motor bearing body simulating actual working conditions according to claim 6, characterized in that: The end of the main shaft penetrates through the bottom plate of the lubricating oil seal cylinder, and an O-ring seal is provided between the main shaft and the central perforation of the bottom plate of the lubricating oil seal cylinder; the inner ring of the conductive slip ring is coaxially fixed on the end of the main shaft, and the outer ring of the conductive slip ring is fixedly embedded on the bottom plate of the lubricating oil seal cylinder; a wire threading hole is provided in the side wall of the cylinder body of the lubricating oil seal cylinder, and the wire between the outer ring of the conductive slip ring and the rheostat is led out of the lubricating oil seal cylinder through the wire threading hole; a conductive slip ring cover is threadedly sleeved on the outer side of the bottom of the lubricating oil seal cylinder.

9. The quantitative test device for electric corrosion of the motor bearing body simulating actual working conditions according to claim 8, characterized in that: The axial load application unit includes an axial loading oil cylinder, an axial force measuring sensor, an axial ejector rod, an axial load oil pump, an axial load controller, an ejector rod support seat, an oil cylinder support seat, a force measuring sensor support plate and a stable support seat; the ejector rod support seat is fixedly installed on the base; the axial ejector rod is coaxially distributed with the main shaft, the axial ejector rod passes through the guiding light hole on the ejector rod support seat, the axial ejector rod is in sliding contact with the guiding light hole, and one end of the axial ejector rod is fixedly connected to the conductive slip ring cover by screwing; the oil cylinder support seat is fixedly installed on the base; the axial loading oil cylinder is fixedly installed on the oil cylinder support seat, and the piston rod of the axial loading oil cylinder is coaxially distributed with the main shaft; the axial force measuring sensor is located between the other end of the axial ejector rod and the piston rod of the axial loading oil cylinder; the force measuring sensor support plate is horizontally fixedly installed between the ejector rod support seat and the oil cylinder support seat; the axial force measuring sensor is in sliding contact with the upper surface of the force measuring sensor support plate; the stable support seat abuts against the oil cylinder support seat, and the stable support seat is fixedly installed on the base.

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