Radial sliding bearing identification test device and system

Abstract

The invention belongs to the technical field of bearing testing, and particularly relates to a radial sliding bearing identification test device and system. Comprising a sliding bearing test device and a rotating shaft radial loading device. The testing device has the beneficial effects that the testing device can effectively simulate vortex motion formed by a rotating shaft under the driving of tangential force of a liquid film when the rotating shaft operates in a cylindrical sliding bearing through a bearing supporting form with one end fixed and the other end floating, and the vortex motion is parameterized in a vibration form; compared with the prior art that only testing can be carried out on the whole machine, interference factors of other bearings of the whole machine are eliminated, and obtained data are more accurate; by changing the loading force, the angle, the rotating speed and the medium temperature and flow, the vortex influence of different loading forces in all directions on the bearing is calibrated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing test, and particularly relates to a radial sliding bearing identification test device and system. BACKGROUND

[0002] The cylindrical sliding bearing is a common bearing type for radial support of rotating equipment, which forms a converging wedge-shaped liquid film through eccentric arrangement of the rotating shaft and the cylindrical bearing, for supporting the rotor, however, due to the tangential force of the liquid film support force, the shaft neck center is not static at the static balance position, showing a state of "pulling" the rotating shaft to make orbital motion around the balance point or the bearing center, i.e. forming whirl.

[0003] Whirl is an inherent property of the cylindrical bearing, which may excite dangerous liquid film oscillation resonance, leading to severe vibration, wear and even equipment damage. Therefore, measures should be taken to suppress whirl (especially to prevent oil film oscillation) in bearing design, rotor dynamics design and operation strategy, which is the key to ensure stable, safe and long-life operation of the sliding bearing rotor system. At present, there is no suitable test device to test the anti-whirl capability of the designed cylindrical bearing, mainly relying on whole machine running test for testing and verification, but there are many interference parameters in the whole machine, which cannot realize multi-working condition test, and seriously affect the design and test progress of the whole machine.

[0004] Therefore, it is urgent to design a test device to quantitatively test and calibrate the working condition parameters affecting the anti-whirl capability of the cylindrical guide bearing, so as to provide reference for the optimization design of the bearing, the design of the rotor dynamics and the selection of the equipment operation working condition. SUMMARY

[0005] The purpose of the application is to provide a radial sliding bearing identification test device and system, which can quantitatively measure the anti-whirl working condition parameters of the bearing.

[0006] The technical scheme of the application is as follows: a radial sliding bearing identification test device, comprising a sliding bearing test device and a rotating shaft radial loading device; The sliding bearing test device comprises a rotating shaft, a lower support bearing, an upper support bearing, a bearing chamber, a driving motor and a support frame, the driving motor is arranged at the lower part of the support frame, the rotating shaft is axially and radially limited by the lower support bearing and the upper support bearing, respectively, the middle part of the rotating shaft is externally provided with a test cylindrical sliding bearing, the test cylindrical sliding bearing is integrally sleeved in the bearing chamber, the outer ring of the lower support bearing is fixed at the lower end of the bearing chamber, and the upper support bearing is floatingly fixed; The rotating shaft radial loading device comprises an upper support bearing shell, a spring, a servo motor, a indexing support disc and an indexing support disc support, the upper support bearing shell is installed on an upper support bearing, the spring is arranged on one side of the upper support bearing shell, one end of the spring is the servo motor, the servo motor is fixed on the indexing support disc, and the indexing support disc is fixed through the indexing support disc support.

[0007] The lower support bearing and the upper support bearing both adopt a pair of back-to-back conical roller bearings.

[0008] The driving motor is arranged at the lower part of the support frame and is connected with the rotating shaft through a diaphragm type coupling.

[0009] The rotating shaft is a rigid rotor, the static deflection is 0, the radial runout is less than or equal to 0.01 mm, the cylindricity is less than or equal to 0.01 mm, the surface roughness is less than Ra0.2, and the rotating shaft is subjected to demagnetization treatment.

[0010] The servo motor is a variable frequency motor.

[0011] The fitting gap between the rotating shaft and the test sliding bearing is consistent with the design gap of the bearing.

[0012] The reinstallation center of the rotating shaft, the radial center of the test sliding bearing and the radial geometric center of the bearing chamber are consistent, and the concentricity is less than or equal to 0.01 mm.

[0013] The single-side radial displacement gap of the lower support bearing and the upper support bearing is less than or equal to the design gap of the test sliding bearing and the shaft.

[0014] The medium used inside the bearing chamber should be consistent with the design medium of the test sliding bearing, and is desalted water or lubricating oil.

[0015] A radial sliding bearing identification test system, comprising a radial sliding bearing identification test device, one end of the radial sliding bearing identification test device is connected with a second storage tank through a pipeline, a third circulating pump is arranged in the second storage tank, the third circulating pump is connected with a second cooler through a pipeline, the second cooler is connected with two ends of the radial sliding bearing identification test device through a pipeline, one end of the radial sliding bearing identification test device is connected with a servo motor, the servo motor is connected with an electric control system, vibration displacement acquisition probes and temperature probes are arranged on the radial sliding bearing identification test device, a pressure gauge, a flow meter and a first adjusting valve are connected in sequence on the radial sliding bearing identification test device through a pipeline, the first adjusting valve is connected with a first storage tank through a pipeline, a pressure gauge, a second adjusting valve, a filter, a first adjusting valve, a first circulating pump and a first adjusting valve are connected in sequence on the radial sliding bearing identification test device through a pipeline, the first adjusting valve is connected with the first storage tank through a pipeline, one end of a third adjusting valve is connected with a pipeline between the first circulating pump and the first adjusting valve, and the other end of the third adjusting valve is connected with the first storage tank, and the first storage tank is also connected with a second circulating pump, the second circulating pump is connected with a first cooler, and the first cooler is connected with the first storage tank.

[0016] The test device of the present application can effectively simulate the whirl formed by the tangential force of the liquid film when the rotating shaft runs in the cylindrical sliding bearing, and the whirl is parameterized in the form of vibration, which excludes the interference factors of other bearings in the whole machine and obtains more accurate data compared with the current test on the whole machine; the influence of different loading forces in various directions on the whirl of the bearing is calibrated through variable loading force, variable angle, variable rotating speed, variable medium temperature and flow; the quantitative whirl displacement parameters are compared, which provides direct and characterizable parameter basis for suppressing whirl (especially preventing oil film oscillation) through bearing parameter optimization design, rotor dynamics design and operation condition selection, and ensuring stable, safe and long-life operation of the sliding bearing rotor system.

[0017] The field operation is stable in all aspects, and can meet the test requirements. The rotating speed of the rotating shaft is controlled at 0-3000r / min; the radial loading load is controlled at 0-5000N; the radial loading load is controlled in the direction of ±60°; the working medium temperature is controllable, the adjustment range is 10-75 DEG C, and the error range is ±1 DEG C; the working medium flow is controllable, the adjustment range is 800-2000L / h, and the adjustment range error range is 50L / h; the accurate measurement of the whirl performance of the bearing is realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view of the radial sliding bearing identification test device provided by the present application; Figure 2 It is a front view of the radial sliding bearing identification test device provided by the present application; Figure 1 It is a top view. Figure 3 A schematic diagram of a radial sliding bearing identification test system provided by the present application.

[0019] In the figure, 100. drive motor; 110. support frame; 120. upper support bearing; 121 lower support bearing; 130. test sliding bearing; 140. bearing chamber; 150. shaft; 200. upper support bearing housing; 210. spring; 220. servo motor; 230. index support disc, 10. radial sliding bearing identification test device; 11. vibration displacement acquisition probe; 12. temperature probe; 13. servo motor; 14. electric control system; 20. first storage tank; 21. first regulating valve; 22. first circulating pump; 23. filter; 24. second regulating valve; 25. pressure gauge; 26 flow meter; 27. third regulating valve; 28. second circulating pump; 29. first cooler; 30. second storage tank; 31. third circulating pump; 32. second cooler. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] As shown in Figure 1 and 2 , a radial sliding bearing identification test device, comprising a sliding bearing test device and a shaft radial loading device.

[0022] The sliding bearing testing device includes a rotating shaft 150, a lower support bearing 120, an upper support bearing 121, a bearing chamber 140, a drive motor 100, and a support frame 110. The drive motor 100 is arranged in a lower position and is suspended from the lower part of the support frame 110. It is connected to the rotating shaft 150 through a flexible coupling such as a diaphragm coupling. The rotating shaft 150 is a rigid rotor with a static deflection of 0, radial runout ≤0.01mm, cylindricity ≤0.01mm, and surface roughness lower than R. a0.2, the rotating shaft 150 is demagnetized. Axial and radial constraints on the rotating shaft 150 are achieved through lower and upper support bearings 121 and 120, respectively. Each of the lower and upper support bearings 121 uses a pair of back-to-back tapered roller bearings. The outer ring of the lower support bearing 121 is fixed to the lower end of the bearing chamber 140, while the upper support bearing 120 is fixed in a floating manner. This maintains the lower end of the rotating shaft 150 fixed and the upper end floating, simulating the radial movement of the rotating shaft 150. The outer part of the middle section of the rotating shaft 150 is fitted with a test sliding bearing 130, which is integrally mounted within the bearing chamber 140. The fit clearance between the rotating shaft 150 and the test sliding bearing 130 is consistent with the bearing's design clearance. The reinstallation center of the rotating shaft 150, the radial center of the test sliding bearing 130, and the radial geometric center of the bearing chamber 140 should be consistent, with a concentricity ≤0.01mm. The bearing chamber 140 has a limiting function for the radial displacement of the upper support bearing 120 to prevent the shaft 150 from contacting or even wearing with the test sliding bearing 130 during the test; the single-sided radial displacement clearance of the upper support bearing 120 should be less than or equal to 0.5 times the design clearance between the test sliding bearing 130 and the shaft; the medium used inside the bearing chamber 140 should be consistent with the design medium of the test sliding bearing 130, generally demineralized water, lubricating oil, etc.

[0023] The radial loading device for the rotating shaft includes an upper support bearing housing 200, a spring 210, a linear servo motor 220, an indexing support plate 230, and an indexing support plate bracket. The upper support bearing housing 200 is mounted on the upper support bearing 120 and forms a transition fit with the outer ring of the upper support bearing 120. A spring 210 is arranged on one side of the upper support bearing housing 200, and one end of the spring 210 is a linear servo motor 220. By controlling the axial displacement x of the servo motor 220 shaft, the spring 210 is compressed to a given displacement. Based on the compression coefficient k of the spring 210, the spring force can be accurately calculated using the formula F=kx.

[0024] The spring 210 is within the displacement range of the servo motor 220 and can achieve a spring force from 0 to 3F. W Adjustments.

[0025] The servo motor 220 is fixed on an indexing support plate 230 with a range of ±60° centered on the radial geometric center of the bearing chamber 140. Each given angle is marked on the indexing support plate 230 for adjusting the position of the servo motor 220 during the test, so as to realize the radial force loading in different directions in the circumferential direction, and at the same time, the angle of the loading force can be accurately recorded.

[0026] The indexing support plate 230 is fixed by an indexing support plate bracket, which is fixed on the test bench base.

[0027] The servo motor 220 is a variable frequency motor. Through the control system of the test device, it can simulate the speed state of the equipment during startup and coasting, and at the same time, it can measure the bearing whirl capability at different speed platforms.

[0028] like Figure 3 As shown, a radial sliding bearing qualification test system includes a bearing lubrication and cooling system and a working medium pressure, temperature, and flow rate regulation system. It comprises several shut-off valves, heat exchangers, circulating pumps, filters, thermometers, pressure gauges, flow meters, and storage tanks. Specifically, one end of the radial sliding bearing qualification test device 10 is connected to a second storage tank 30 via a pipeline. A third circulating pump 31 is installed inside the second storage tank 30. The third circulating pump 31 is connected to a second cooler 32 via a pipeline. The second cooler 32 is connected to both ends of the radial sliding bearing qualification test device 10 via a pipeline. One end of the radial sliding bearing qualification test device 10 is connected to a servo motor 13, which is connected to an electronic control system 14. A vibration displacement acquisition probe 11 is installed on the radial sliding bearing qualification test device 10. Temperature probe 12, radial sliding bearing qualification test device 10 is connected in series with pressure gauge 25, flow meter 26 and first regulating valve 21 through pipeline. First regulating valve 21 is connected to first storage tank 20 through pipeline. Radial sliding bearing qualification test device 10 is also connected in series with pressure gauge 25, second regulating valve 24, filter 23, first regulating valve 21, first circulation pump 22 and first regulating valve 21 through pipeline. First regulating valve 21 is connected to first storage tank 20 through pipeline. One end of third regulating valve 27 is connected to the pipeline between first circulation pump 22 and first regulating valve 21, and the other end is connected to first storage tank 20. First storage tank 20 is also connected to second circulation pump 28. Second circulation pump 28 is connected to first cooler 29. First cooler 29 is connected to first storage tank 20.

[0029] The working medium pressure, temperature, and flow rate regulation system relies on a shut-off valve, a circulating pump, and a cooler to adjust the working medium temperature and pressure, ensuring that the test object operates within the assumed stable operating range. A 5µm filter is installed in the working medium circuit to prevent damage to the test object during the test.

[0030] During the test, the system control valve, the device electrical control system, and the radial loading device of the rotating shaft simulated the radial load conditions of the bearing under different working medium temperatures, pressures, speeds, and different orientations and magnitudes.

[0031] First, a fixed-angle loading test is conducted. The loading device is kept at a fixed angle, the motor is started, and after the shaft rotates smoothly, the linear servo motor is controlled to compress the spring in stages. The axial displacement of the shaft in the 90° direction on the same horizontal plane is measured. After the fixed-angle loading test is completed, the loading force angle is adjusted according to the indexing dial, and the shaft displacement measurement at the given angle is completed in stages.

[0032] Then, the speed of the drive motor was changed, and the whirl performance of the bearings on each platform was measured.

[0033] Then, the temperature and pressure of the working medium were changed, and the eddy current performance of the platform with different parameters was measured.

[0034] During testing, if the axial displacement exceeds 0.8 times the bearing operating clearance or exceeds 500 μm, the machine should be stopped immediately. Based on the spectral characteristics of the shaft displacement, the displacement value corresponding to 0.42 to 0.48 times the rotational frequency is generally taken as the magnitude of the eddy displacement.

[0035] This invention has the following characteristics: This experimental setup, with a bearing support structure that is fixed at one end and floating at the other, effectively simulates the whirl motion of a rotating shaft driven by the tangential force of a liquid film during operation in a cylindrical sliding bearing. This whirl motion is parameterized as vibration, eliminating interference from other bearings in the machine compared to current methods that only test the entire machine. By precisely adjusting the spring loading force, the whirl parameters of the bearing under different radial forces in a fixed direction are calibrated, thus demonstrating the bearing's anti-whirl motion capability in that fixed direction. By changing the direction of the radial loading force, the whirl parameters of the cylindrical guide bearing at each given angle within a ±60° range are measured, further demonstrating the bearing's anti-whirl motion capability under different directional loading forces on the turntable. By changing parameters such as the shaft speed and the temperature and pressure of the working medium, the bearing's anti-whirl motion capability under different speed, working medium temperature, and pressure conditions is demonstrated.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0037] Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A radial sliding bearing qualification test apparatus, characterized by: The application relates to a sliding bearing test device and a rotating shaft radial loading device. The sliding bearing test device comprises a rotating shaft, a lower supporting bearing, an upper supporting bearing, a bearing chamber, a driving motor and a supporting frame; the driving motor is arranged at the lower part of the supporting frame; the rotating shaft is axially and radially limited by the lower supporting bearing and the upper supporting bearing; the middle part of the rotating shaft is externally provided with a test cylindrical sliding bearing; the test cylindrical sliding bearing is integrally sleeved in the bearing chamber; the outer ring of the lower supporting bearing is fixed at the lower end of the bearing chamber; and the upper supporting bearing is fixed in a floating mode. The rotating shaft radial loading device comprises an upper supporting bearing shell, a spring, a servo motor, a graduation supporting disc and a graduation supporting disc support; the upper supporting bearing shell is arranged on the upper supporting bearing; the spring is arranged on one side of the upper supporting bearing shell; one end of the spring is the servo motor; the servo motor is fixed on the graduation supporting disc; and the graduation supporting disc is fixed through the graduation supporting disc support.

2. A radial sliding bearing qualification test apparatus as claimed in claim 1, characterized in that: The lower supporting bearing and the upper supporting bearing are both a pair of back-to-back conical roller bearings.

3. A radial sliding bearing qualification test apparatus as claimed in claim 1, wherein: The driving motor is arranged at the lower part of the supporting frame and is connected with the rotating shaft through a diaphragm type coupling.

4. A radial sliding bearing qualification test apparatus as claimed in claim 1, wherein: The rotating shaft is a rigid rotor with a static deflection of 0, a radial runout of less than or equal to 0.01 mm, a cylindricity of less than or equal to 0.01 mm, a surface roughness of less than Ra0.2 and a demagnetization treatment.

5. A radial bearing qualification test apparatus as set forth in claim 1 wherein: The servo motor is a variable frequency motor.

6. A radial bearing qualification test apparatus as set forth in claim 1, characterized in that: The cooperation gap between the rotating shaft and the test sliding bearing is consistent with the design gap of the bearing.

7. A radial bearing qualification test apparatus as set forth in claim 1, wherein: The reinstallation center of the rotating shaft, the radial center of the test sliding bearing and the radial geometric center of the bearing chamber are consistent, and the concentricity is less than or equal to 0.01 mm.

8. A radial bearing qualification test apparatus as set forth in claim 1, characterized in that: The single-side radial displacement gap of the lower supporting bearing and the upper supporting bearing is less than or equal to the design gap of the test sliding bearing and the shaft.

9. A radial bearing qualification test apparatus as set forth in claim 1, wherein: The medium used in the bearing chamber should be consistent with the design medium of the test sliding bearing, and is desalted water or lubricating oil.

10. A radial sliding bearing qualification test system characterized by: The radial sliding bearing identification test device is connected with the second storage tank through a pipeline at one end, the third circulating pump is arranged in the second storage tank, the third circulating pump is connected with the second cooler through a pipeline, the second cooler is connected with the two ends of the radial sliding bearing identification test device through a pipeline, one end of the radial sliding bearing identification test device is connected with the servo motor, the servo motor is connected with the electric control system, the vibration displacement acquisition probe and the temperature probe are arranged on the radial sliding bearing identification test device, the pressure gauge, the flow meter and the first adjusting valve are connected in sequence through a pipeline on the radial sliding bearing identification test device, the first adjusting valve is connected with the first storage tank through a pipeline, the pressure gauge, the second adjusting valve, the filter, the first adjusting valve, the first circulating pump and the first adjusting valve are connected in sequence through a pipeline on the radial sliding bearing identification test device, the first adjusting valve is connected with the first storage tank through a pipeline, one end of the third adjusting valve is connected with the pipeline of the first circulating pump and the first adjusting valve, and the other end is connected with the first storage tank, the first storage tank is also connected with the second circulating pump, the second circulating pump is connected with the first cooler, and the first cooler is connected with the first storage tank.

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