Device and method for measuring pressure and thickness of oil film on surface of sliding bearing bush

Abstract

The invention discloses a sliding bearing bush surface oil film pressure and thickness measuring device which comprises a chassis, a measurer is fixed to the upper surface of the chassis, supporting frames are fixed to the two sides of the measurer on the chassis respectively, a driving device is fixed between the tops of the two supporting frames, and moving devices are fixed to the opposite sides of the two supporting frames respectively. A loading device is fixed between the two moving devices, one supporting frame is provided with a ball screw, one end of the ball screw is hinged to the driving device, the ball screw is provided with a screw nut, and the screw nut is fixedly connected with the corresponding moving device; one end of the fixing shaft is hinged to the driving device, the fixing shaft penetrates through the loading device, and the other end of the fixing shaft is sleeved with a thrust device fixedly connected with the loading device; the invention further discloses a sliding bearing bush surface oil film pressure and thickness measuring method, the oil film pressure and the oil film thickness can be measured at the same time, the oil film state and an electric signal can be calibrated, and measured data can be fed back in time.

Description

Technical Field

[0001] The invention belongs to the technical field of oil film measuring devices, and relates to a device for measuring the oil film pressure and thickness on the surface of a sliding bearing bush. The invention also relates to a method for measuring the oil film pressure and thickness on the surface of a sliding bearing bush. Background Art

[0002] Sliding bearings are key components of sliding bearings, which play a supporting and fixing role and are used to reduce friction and wear during movement. Compared with traditional rolling bearings, sliding bearings rely on smooth surfaces to support loads and usually require lubricants to reduce direct contact. They are widely used in automobiles, railways, aviation, and machinery manufacturing. As a key component of sliding bearings, the performance of sliding bearings will directly affect the performance of sliding bearings. With the rapid advancement of industrial machinery, the speed and load of the machine have increased accordingly. High-speed and heavy-load conditions have become more common, and higher requirements have been placed on the performance of sliding bearings.

[0003] The factors that affect the efficiency of sliding bearings include materials, structure, and lubricants. Among them, the pressure and thickness of the film formed by the lubricant are important factors affecting the efficiency and life of the sliding bearings. A special measuring device is required to measure the pressure and thickness of the oil film. Traditional measuring devices that measure the oil film thickness and pressure of the sliding bearings cannot simulate the operating conditions of the sliding bearings. The measurement accuracy is poor and the measurement data cannot be fed back in time. Therefore, it is urgent to develop a new measuring device to solve this technical problem. Summary of the invention

[0004] The purpose of the present invention is to provide a device for measuring the oil film pressure and thickness on the surface of a sliding bearing, which can simulate the operating state of the sliding bearing and measure data in real time when measuring the oil film thickness and pressure of the sliding bearing.

[0005] The first technical solution adopted by the present invention is a device for measuring the oil film pressure and thickness on the surface of a sliding bearing, comprising a chassis, a measuring device fixed on the upper surface of the chassis, support frames fixed on both sides of the measuring device on the chassis, a driving device fixed between the tops of the two support frames, a moving device fixed on each opposite side of the two support frames, a loading device fixed between the two moving devices, a ball screw provided on one of the support frames and one end of the ball screw is hinged to the driving device, a screw nut provided on the ball screw, and the screw nut is fixed to the corresponding moving device; it also includes a fixed shaft, one end of the fixed shaft is hinged to the driving device and the fixed shaft passes through the loading device, and the other end of the fixed shaft is sleeved with a thrust device fixed to the loading device.

[0006] The first technical solution of the present invention is also characterized in that: A first groove is provided on the chassis at a position between the two support frames, the first groove has a depth of 1mm-3mm, and a positioning pin hole is provided at the bottom of the first groove; the measuring device includes a base, the base is adapted to the shape and size of the first groove, the bottom of the base is fixed in the first groove and the rest of the base is located outside the first groove, a plurality of second grooves are provided on the upper surface of the base, a first gasket is fixed at the bottom of the second groove, the measuring device also includes a shell, a plurality of piezoelectric sensors are fixed at the bottom of the shell and the number of the piezoelectric sensors is the same as the number of the second grooves, a first sleeve which is adapted to the shape and size of the second groove is sleeved on the piezoelectric sensor, the piezoelectric sensors are fixed in the second groove one by one and the bottom of the first sleeve and the bottom of the piezoelectric sensor are both fixed on the first gasket, an oil inlet is provided on one side of the shell, an oil outlet is provided on the other side of the shell, a third groove is provided on the surface of the shell, a plurality of fourth grooves are provided at the bottom of the third groove, and a heating ring is provided in the fourth groove.

[0007] The driving device includes a top plate, the bottom surface of the top plate is fixed between the tops of the two support frames, a mounting plate is fixed on the top surface of the top plate and the mounting plate is located directly above the ball screw, a stepper motor is fixed on the mounting plate, an upward button, a stop button and a downward button are arranged on the stepper motor, a bearing seat is fixed on the side of the ball screw on the support frame where the ball screw is located and one end of the ball screw is hinged to the bearing seat, the other end of the ball screw passes through the top plate and the mounting plate and is hinged to the stepper motor, the upward button, the stop button and the downward button are electrically connected to the ball screw respectively; a servo motor is fixed on the top surface of the top plate at a position directly above the fixed shaft, one end of the spline shaft is hinged to the bottom of the servo motor, the other end of the spline shaft passes through the top plate, a spline groove is opened at one end of the fixed shaft and the spline shaft is fixed in the spline groove, and the spline groove depth is 30mm-40mm.

[0008] A plurality of pads are fixed between the support frame and the chassis, a grating ruler is arranged on one side of one of the support frames in a direction perpendicular to the chassis, and a plurality of first through holes are opened at positions other than the moving device, grating ruler, bearing seat and ball screw installed on the support frame.

[0009] The moving device includes two guide rails. A guide rail is fixed on each support frame on both sides of the ball screw, and the guide rail is parallel to the ball screw. A slider is sleeved on the guide rail. The two sliders are commonly fixed with one side of a moving plate. The screw nut is fixed to the corresponding moving plate, and the loading device is fixed between the two moving plates.

[0010] The loading device includes a support plate, which is fixed between the two moving plates and is parallel to the top plate. A fifth groove is provided on the surface of the support plate close to the top plate. The fifth groove has a groove depth of 1mm-3mm. The fixed shaft passes through the support plate from the fifth groove. A bidirectional thrust ball bearing is provided in the fifth groove around the fixed shaft sleeve. The bidirectional thrust ball bearing includes a first seat ring, a first steel ball assembly, a shaft ring, a second seat ring, and a second steel ball assembly which are fixed together in sequence. The bottom of the first seat ring is fixed in the fifth groove, and the rest of the first seat ring, the first steel ball assembly, the shaft ring, the second seat ring, and the second steel ball assembly are all located outside the fifth groove. The outer side of the bidirectional thrust ball bearing is provided with a shaft sleeve and the bottom of the shaft sleeve is fixed on the support plate. The fixed shaft is a two-stage stepped shaft structure. One end of the fixed shaft with a spline groove is located on the outer stepped shaft. The shaft ring is clamped on the inner stepped shaft of the fixed shaft. The inner diameter of the second seat ring and the inner diameter of the second steel ball assembly are both matched with the diameter of the outer stepped shaft of the fixed shaft. The second sleeve is sleeved on the inner stepped shaft of the fixed shaft and one end of the second sleeve is fixed on the shaft ring. The first seat ring and the first steel ball assembly are both clamped on the second sleeve. The thrust device is sleeved on one end of the inner stepped shaft of the fixed shaft and the thrust device is fixedly connected to the other end of the second sleeve.

[0011] The thrust device includes a thrust plate, the shape of which is matched with the third groove and the size of which is not larger than the third groove. A sixth groove is provided on one side of the thrust plate, and a second through hole perpendicular to the bottom of the sixth groove is provided on the thrust plate from the bottom of the sixth groove and the diameter of the second through hole is matched with the diameter of the stepped shaft inside the fixed shaft. A second gasket is fixed to the bottom of the sixth groove by a plurality of screws and the second gasket covers the second through hole. One end of the stepped shaft inside the fixed shaft extends into the thrust plate from the second through hole, and the distance from the top of the shaft ring to the top of the sleeve is not greater than the distance from the top surface of the second gasket to the top of the thrust plate.

[0012] The second technical solution adopted by the present invention is a method for measuring the oil film pressure and thickness on the surface of a sliding bearing, comprising the following steps: Step 1: Start the stepper motor to move the lead screw nut upward, and then drive the moving device, the loading device, and the thrust device upward in turn, place a number of sliding bearings at equal distances at the bottom of the third groove, attach a number of waveguides on the surface of each sliding bearing, and cover the surface of the sliding bearing and all the waveguides with a babbitt alloy coating; Step 2: Connect the heating ring to the power supply and heat the third groove, start the stepper motor to move the thrust device downward, and start the servo motor to rotate the thrust plate driven by the fixed shaft, adjust the downward position of the thrust device, and collect the guided wave signals of the oil film pressure and oil film thickness through the piezoelectric sensor.

[0013] The second technical solution of the present invention is also characterized in that: In step 1, the screw nut is moved upward by the upward button, thereby driving one movable plate to move upward. The movable plate transmits the force to the support plate and then drives the other movable plate to move upward. The force is transmitted to the sleeve and the bidirectional thrust ball bearing in turn, and then drives the second sleeve and the thrust plate to move upward; the thickness of the waveguide is 1mm-3mm.

[0014] Step 2 is specifically performed as follows: Step 2.1, connect the heating ring to a power source and control the temperature in the third groove to between room temperature and 80°C; Step 2.2, use the downward button to move the lead screw nut downward, thereby driving one moving plate downward, the moving plate transmits force to the support plate and then drives another moving plate downward, the force is transmitted to the sleeve and the bidirectional thrust ball bearing in turn, and then drives the second sleeve and the thrust plate downward, and at the same time starts the servo motor to make the fixed shaft drive the thrust plate to rotate; Step 2.3, collect the waveguide signals of oil film pressure and oil film thickness through piezoelectric sensors, adjust the downward position of the thrust device after each collection so that the oil film pressure collected by the piezoelectric sensor is maintained at 1MPa-20MPa, and the collected oil film thickness is maintained at 10μm-200μm, and the thrust device is adjusted each time to make the oil film pressure collected by the piezoelectric sensor change by 1MPa-2MPa, and the collected oil film thickness change by 10μm-20μm, and use the convolutional neural network in deep learning to decouple the waveguide signal, and obtain the relationship between the pressure distribution on the sliding bearing surface and the change of the waveguide signal waveform, as well as the relationship between the oil film thickness on the sliding bearing surface and the change of the waveguide signal waveform, so as to obtain the pressure distribution and oil film thickness at any point on the sliding bearing surface and complete the measurement.

[0015] The beneficial effects of the present invention are: The device for measuring the oil film pressure and thickness on the surface of the sliding bearing of the present invention has a compact structure and is easy to use. It can not only measure the oil film pressure, but also the oil film thickness. At the same time, due to the arrangement of the piezoelectric sensor, the oil film state and the electrical signal can be calibrated, which is convenient for subsequent measurements. The fixed shaft can drive the thrust plate to rotate so as to simulate the operating state of the sliding bearing during measurement. The method for measuring the oil film pressure and thickness of the sliding bearing changes the oil film pressure and thickness by adjusting the downward position of the thrust plate. The piezoelectric sensor is used to collect the guided wave signal, and the guided wave signal is decoupled by using the convolutional neural network in deep learning, so as to obtain the relationship between the pressure distribution on the surface of the sliding bearing and the change of the guided wave signal waveform and the relationship between the oil film thickness on the surface of the sliding bearing and the change of the guided wave signal waveform, so as to obtain the pressure distribution and oil film thickness at any point on the surface of the sliding bearing, and realize the accurate measurement of the oil film pressure and thickness on the surface of the sliding bearing and the timely feedback of the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall structural diagram of the present invention; Figure 2 is a transverse cross-sectional view of the measuring device of the present invention; Figure 3 is a longitudinal cross-sectional view of the measuring device of the present invention; Figure 4 is a cross-sectional view of the servo motor and its connection parts in the present invention; Figure 5 is a cross-sectional view of a spline shaft and a spline groove in the present invention; Figure 6 It is a structural diagram of the lead screw and its connection parts in the present invention; Figure 7 It is a cross-sectional view of the loading device in the present invention.

[0017] In the figure, 1. support frame, 2. mounting plate, 3. stepper motor, 4. servo motor, 5. guide rail, 6. slider, 7. ball screw, 8. screw nut, 9. bearing seat, 10. grating ruler, 11. moving plate, 12. bidirectional thrust ball bearing, 13. bushing, 14. fixed shaft, 15. support plate, 16. second sleeve, 17. housing, 18. heating ring, 19. thrust plate, 20. waveguide, 21. pad, 22. second gasket, 23. piezoelectric sensor, 24. base, 25. chassis, 26. sliding bearing, 27. first sleeve, 28. first gasket, 29. top plate, 30. screw, 31 .Babbitt alloy coating, 32. Positioning shaft hole, 33. Fifth groove, 34. Thrust device, 35. Moving device, 36. First groove, 37. Oil inlet, 38. Oil outlet, 39. Up button, 40. Stop button, 41. Down button, 42. Loading device, 43. Spline shaft, 44. Spline groove, 45. First through hole, 46. Driving device, 47. First seat ring, 48. First steel ball assembly, 49. Shaft ring, 50. Second seat ring, 51. Second steel ball assembly, 52. Sixth groove, 53. Third groove, 54. Fourth groove, 55, Second groove, 56. Measuring device, 57. Second through hole. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Sliding bearing surface oil film pressure and thickness measuring device, refer to Figure 1, including a chassis 25, a measuring device 56 is fixed on the upper surface of the chassis 25, a support frame 1 is fixed on both sides of the measuring device 56 on the chassis 25, a driving device 46 is fixed between the tops of the two support frames 1, a moving device 35 is fixed on each opposite side of the two support frames 1, a loading device 42 is fixed between the two moving devices 35, a ball screw 7 is provided on one of the support frames 1 and one end of the ball screw 7 is hinged to the driving device 46, a screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixed to the corresponding moving device 35; also includes a fixed shaft 14, one end of the fixed shaft 14 is hinged to the driving device 46 and the fixed shaft 14 passes through the loading device 42, and the other end of the fixed shaft 14 is sleeved with a thrust device 34 fixed to the loading device 42, and a first groove 36 is opened at a position between the two support frames 1 on the chassis 25, and the groove depth of the first groove 36 is 1mm-3mm, refer to Figure 2 , the first groove 36 has a positioning pin hole 32 at the bottom; Figure 3 The measuring device 56 includes a base 24, the base 24 is adapted to the shape and size of the first groove 36, the bottom of the base 24 is fixed in the first groove 36 and the rest of the base 24 is located outside the first groove 36, and the positioning pin hole 32 is convenient for positioning the base 24 to prevent it from moving; a plurality of second grooves 55 are opened on the upper surface of the base 24, and a first gasket 28 is fixed at the bottom of the second groove 55 for changing the distance between the piezoelectric sensor 23 and the chassis 25 during measurement, and the measuring device 56 also includes a shell 17, and a plurality of piezoelectric sensors 23 are fixed at the bottom of the shell 17, and the number of the piezoelectric sensors 23 is the same as the number of the second grooves 55, and the piezoelectric The sensor 23 is used to collect the guided wave signal; the piezoelectric sensor 23 is sleeved with a first sleeve 27 that matches the shape and size of the second groove 55, the piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are both fixed on the first gasket 28, an oil inlet 37 is opened on one side of the shell 17, and an oil outlet 38 is opened on the other side of the shell 17, a third groove 53 is opened on the surface of the shell 17, and a plurality of fourth grooves 54 are opened at the bottom of the third groove 53, and a heating ring 18 is arranged in the fourth groove 54, and the heating ring 18 can control the temperature in the fourth groove 54 between room temperature and 80°C.

[0020] Reference Figure 1The driving device 46 includes a top plate 29, the bottom surface of the top plate 29 is fixed between the tops of the two support frames 1, a mounting plate 2 is fixed on the top surface of the top plate 29 and the mounting plate 2 is located directly above the ball screw 7, a stepper motor 3 is fixed on the mounting plate 2, and an upward button 39, a stop button 40, and a downward button 41 are provided on the stepper motor 3, a bearing seat 9 is fixed on the side of the ball screw 7 on the support frame 1 provided with the ball screw 7, and one end of the ball screw 7 is hinged to the bearing seat 9, and the other end of the ball screw 7 passes through the top plate 29 and the mounting plate 2 and is hinged to the stepper motor 3, and the upward button 39, the stop button 40, and the downward button 41 are electrically connected to the ball screw 7 respectively; a servo motor 4 is fixed on the top surface of the top plate 29 at a position directly above the fixed shaft 14, refer to Figure 4 The bottom of the servo motor 4 is hinged with one end of a spline shaft 43, and the other end of the spline shaft 43 passes through the top plate 29. Figure 5 A spline groove 44 is formed at one end of the fixed shaft 14 and the spline shaft 43 is fixed in the spline groove 44 . The spline groove 44 has a depth of 30 mm to 40 mm. The servo motor 4 is used to drive the fixed shaft 14 to rotate.

[0021] Reference Figure 1 A plurality of pads 21 are fixed between the support frame 1 and the chassis 25, a grating ruler 10 is provided on one side of one of the support frames 1 in a direction perpendicular to the chassis 25, and the grating ruler 10 can record the distance moved by the moving device 35 in real time; a plurality of first through holes 45 are opened at positions other than the support frame 1 where the moving device 35, the grating ruler 10, the bearing seat 9, and the ball screw 7 are installed, and the first through holes 45 can reduce the weight of the support frame 1 and thus reduce the pressure on the chassis 25.

[0022] Reference Figure 6 The moving device 35 includes two guide rails 5. A guide rail 5 is fixed on each support frame 1 on both sides of the ball screw 7 and the guide rail 5 is parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. Figure 1 The two sliders 6 are commonly fixed to one side of a moving plate 11 , the lead screw nut 8 is fixedly connected to the corresponding moving plate 11 , and the loading device 42 is fixed between the two moving plates 11 .

[0023] The loading device 42 includes a support plate 15, which is fixed between the two moving plates 11 and is parallel to the top plate 29. A fifth groove 33 is provided on the surface of the support plate 15 close to the top plate 29, and the fifth groove 33 has a groove depth of 1mm-3mm. The fixed shaft 14 passes through the support plate 15 from the fifth groove 33. A bidirectional thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33, and the bidirectional thrust ball bearing 12 is used to bear and transmit force; the bidirectional thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51 that are fixed together in sequence. The bottom of the first seat ring 47 is fixed in the fifth groove 33, and the rest of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second The steel ball assemblies 51 are all located outside the fifth groove 33, the outer side of the bidirectional thrust ball bearing 12 is sleeved with a shaft sleeve 13 and the bottom of the shaft sleeve 13 is fixed on the support plate 15, the fixed shaft 14 is a two-stage stepped shaft structure, one end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft, the shaft ring 49 is clamped on the inner stepped shaft of the fixed shaft 14, the inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both adapted to the diameter of the outer stepped shaft of the fixed shaft 14, the inner step shaft of the fixed shaft 14 is sleeved with a second sleeve 16 and one end of the second sleeve 16 is fixed on the shaft ring 49, the first seat ring 47 and the first steel ball assembly 48 are both clamped on the second sleeve 16, the thrust device 34 is sleeved on one end of the inner step shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0024] Reference Figure 7 The thrust device 34 includes a thrust plate 19, the shape of which is matched with the third groove 53 and the size of which is not larger than the third groove 53. A sixth groove 52 is provided on one side of the thrust plate 19. A second through hole 57 perpendicular to the bottom of the sixth groove 52 is provided on the thrust plate 19 from the bottom of the sixth groove 52 and the diameter of the second through hole 57 is matched with the diameter of the inner stepped shaft of the fixed shaft 14. A second gasket 22 is fixed to the bottom of the sixth groove 52 by a plurality of screws 30 and the second gasket 22 covers the second through hole 57. One end of the inner stepped shaft of the fixed shaft 14 extends into the thrust plate 19 from the second through hole 57. The fixed shaft 14 can drive the thrust plate 19 to rotate so as to simulate the running state of the sliding bearing 26 during measurement. The distance from the top of the shaft ring 49 to the top of the sleeve 13 is not greater than the distance from the top surface of the second gasket 22 to the top of the thrust plate 19.

[0025] The method for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises the following steps: Step 1: Start the stepper motor 3, and move the lead screw nut 8 upward through the upward button 39, thereby driving a moving plate 11 to move upward. The moving plate 11 transmits force to the support plate 15 and then drives another moving plate 11 to move upward. The force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move upward. A number of sliding bearings 26 are placed equidistantly at the bottom of the third groove 53, and a number of waveguides 20 with a thickness of 1mm-3mm are attached to the surface of each sliding bearing 26. The surface of the sliding bearing 26 and all the waveguides 20 are coated with a babbitt alloy coating 31. The babbitt alloy coating 31 plays a role in fixing the waveguide 20 and providing protection so that the waveguide 20 has good performance in the oil film; Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 between room temperature and 80°C, start the stepper motor 3, and move the screw nut 8 downward through the downward button 41, thereby driving a movable plate 11 to move downward, and the movable plate 11 transmits the force to the support plate 15 and then drives the other movable plate 11 to move downward, and the force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move downward, and at the same time, start the servo motor 4 to make the fixed shaft 14 drive the thrust plate 19 to rotate, and collect the guided wave signals of the oil film pressure and the oil film thickness through the piezoelectric sensor 23. After each collection, adjust the downward position of the thrust device 34 so that the oil film pressure collected by the piezoelectric sensor 23 is maintained at 1MPa-20MPa, and the collected oil film thickness is maintained at 10μm-200μm. Each time the thrust device 34 is adjusted, the oil film pressure collected by the piezoelectric sensor 23 changes by 1 MPa -2MPa, the collected oil film thickness changes by 10μm-20μm, different oil film thicknesses and pressures correspond to different waveguide signals, and the convolutional neural network in deep learning is used to decouple the waveguide signal, and the relationship between the pressure distribution on the surface of the sliding bearing 26 and the change of the waveguide signal waveform, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the change of the waveguide signal waveform are obtained, thereby performing pressure distribution imaging and oil film thickness imaging on the surface of the sliding bearing 26, and establishing a waveguide signal library; the pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

[0026] Embodiment 1: The device for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises a chassis 25, a measuring device 56 is fixed on the upper surface of the chassis 25, support frames 1 are fixed on both sides of the measuring device 56 on the chassis 25, a driving device 46 is fixed between the tops of the two support frames 1, a moving device 35 is fixed on the opposite sides of the two support frames 1, a loading device 42 is fixed between the two moving devices 35, a ball screw 7 is provided on one of the support frames 1 and one end of the ball screw 7 is hinged to the driving device 46, a screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixedly connected to the corresponding moving device 35; it also comprises a fixed shaft 14, one end of the fixed shaft 14 is hinged to the driving device 46 and the fixed shaft 14 passes through the loading device 42, and the other end of the fixed shaft 14 is sleeved with a thrust device 34 fixedly connected to the loading device 42.

[0027] A first groove 36 is provided on the chassis 25 at a position between the two support frames 1, the first groove 36 has a groove depth of 1 mm, and a positioning pin hole 32 is provided at the bottom of the first groove 36; the measuring device 56 includes a base 24, the base 24 is adapted to the shape and size of the first groove 36, the bottom of the base 24 is fixed in the first groove 36 and the rest of the base 24 is located outside the first groove 36, the upper surface of the base 24 is provided with four second grooves 55, the bottom of the second groove 55 is fixed with a first gasket 28, and the measuring device 56 also includes a shell 17, the bottom of the shell 17 is Four piezoelectric sensors 23 are fixed on the shell 17, and a first sleeve 27 that matches the shape and size of the second groove 55 is sleeved on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are fixed on the first gasket 28. An oil inlet 37 is provided on one side of the shell 17, and an oil outlet 38 is provided on the other side of the shell 17. A third groove 53 is provided on the surface of the shell 17, and five fourth grooves 54 are provided at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0028] The driving device 46 includes a top plate 29, the bottom surface of the top plate 29 is fixed between the tops of the two support frames 1, a mounting plate 2 is fixed on the top surface of the top plate 29 and the mounting plate 2 is located directly above the ball screw 7, a stepper motor 3 is fixed on the mounting plate 2, and an upward button 39, a stop button 40, and a downward button 41 are provided on the stepper motor 3, and a bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9, and the other end of the ball screw 7 is hinged to the bearing seat 9. The end passes through the top plate 29 and the mounting plate 2 and is hinged to the stepper motor 3. The up button 39, the stop button 40 and the down button 41 are electrically connected to the ball screw 7 respectively; a servo motor 4 is fixed on the top surface of the top plate 29 at a position just above the fixed shaft 14, and one end of the spline shaft 43 is hinged to the bottom of the servo motor 4, and the other end of the spline shaft 43 passes through the top plate 29. A spline groove 44 is provided at one end of the fixed shaft 14 and the spline shaft 43 is fixed in the spline groove 44, and the spline groove 44 has a depth of 30 mm.

[0029] The moving device 35 includes two guide rails 5. A guide rail 5 is fixed on each of the support frames 1 on both sides of the ball screw 7 and the guide rails 5 are parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are commonly fixed to one side of a moving plate 11. The screw nut 8 is fixedly connected to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0030] The loading device 42 includes a support plate 15, the support plate 15 is fixed between the two moving plates 11 and the support plate 15 is parallel to the top plate 29, a fifth groove 33 is provided on the surface of the support plate 15 close to the top plate 29, the fifth groove 33 has a groove depth of 1mm, the fixed shaft 14 passes through the support plate 15 from the fifth groove 33, a bidirectional thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33, and the bidirectional thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51 that are fixed together in sequence, the bottom of the first seat ring 47 is fixed in the fifth groove 33, and the rest of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a sleeve 13 is sleeved on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the sleeve 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is clamped on the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both matched with the diameter of the outer stepped shaft of the fixed shaft 14. The second sleeve 16 is sleeved on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both clamped on the second sleeve 16. The thrust device 34 is sleeved on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0031] Embodiment 2: The device for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises a chassis 25, a measuring device 56 is fixed on the upper surface of the chassis 25, support frames 1 are fixed on both sides of the measuring device 56 on the chassis 25, a driving device 46 is fixed between the tops of the two support frames 1, a moving device 35 is fixed on the opposite sides of the two support frames 1, a loading device 42 is fixed between the two moving devices 35, a ball screw 7 is provided on one of the support frames 1 and one end of the ball screw 7 is hinged to the driving device 46, a screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixedly connected to the corresponding moving device 35; it also comprises a fixed shaft 14, one end of the fixed shaft 14 is hinged to the driving device 46 and the fixed shaft 14 passes through the loading device 42, and the other end of the fixed shaft 14 is sleeved with a thrust device 34 fixedly connected to the loading device 42.

[0032] A first groove 36 is provided on the chassis 25 at a position between the two support frames 1, the first groove 36 has a groove depth of 2 mm, and a positioning pin hole 32 is provided at the bottom of the first groove 36; the measuring device 56 includes a base 24, the base 24 is adapted to the shape and size of the first groove 36, the bottom of the base 24 is fixed in the first groove 36 and the rest of the base 24 is located outside the first groove 36, the upper surface of the base 24 is provided with five second grooves 55, the bottom of the second groove 55 is fixed with a first gasket 28, and the measuring device 56 also includes a shell 17, the bottom of the shell 17 is Five piezoelectric sensors 23 are fixed on the shell 17, and a first sleeve 27 that matches the shape and size of the second groove 55 is sleeved on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are fixed on the first gasket 28. An oil inlet 37 is provided on one side of the shell 17, and an oil outlet 38 is provided on the other side of the shell 17. A third groove 53 is provided on the surface of the shell 17, and four fourth grooves 54 are provided at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0033] The driving device 46 includes a top plate 29, the bottom surface of the top plate 29 is fixed between the tops of the two support frames 1, a mounting plate 2 is fixed on the top surface of the top plate 29 and the mounting plate 2 is located directly above the ball screw 7, a stepper motor 3 is fixed on the mounting plate 2, and an upward button 39, a stop button 40, and a downward button 41 are provided on the stepper motor 3, and a bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9, and the other end of the ball screw 7 is hinged to the bearing seat 9. The end passes through the top plate 29 and the mounting plate 2 and is hinged to the stepper motor 3. The up button 39, the stop button 40 and the down button 41 are electrically connected to the ball screw 7 respectively; a servo motor 4 is fixed on the top surface of the top plate 29 at a position just above the fixed shaft 14, and one end of a spline shaft 43 is hinged to the bottom of the servo motor 4, and the other end of the spline shaft 43 passes through the top plate 29. A spline groove 44 is provided at one end of the fixed shaft 14 and the spline shaft 43 is fixed in the spline groove 44, and the spline groove 44 has a depth of 35 mm.

[0034] Five pads 21 are fixed between the support frame 1 and the chassis 25, and a grating scale 10 is set on one side of one of the support frames 1 in a direction perpendicular to the chassis 25. The support frame 1 is installed with a moving device 35, a grating scale 10, a bearing seat 9, and six first through holes 45 at positions other than the ball screw 7.

[0035] The moving device 35 includes two guide rails 5. A guide rail 5 is fixed on each of the support frames 1 on both sides of the ball screw 7 and the guide rails 5 are parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are commonly fixed to one side of a moving plate 11. The screw nut 8 is fixedly connected to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0036] The loading device 42 includes a support plate 15, the support plate 15 is fixed between the two moving plates 11 and the support plate 15 is parallel to the top plate 29, a fifth groove 33 is provided on the surface of the support plate 15 close to the top plate 29, the fifth groove 33 has a groove depth of 2mm, the fixed shaft 14 passes through the support plate 15 from the fifth groove 33, a bidirectional thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33, and the bidirectional thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51 that are fixed together in sequence, the bottom of the first seat ring 47 is fixed in the fifth groove 33, and the rest of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a sleeve 13 is sleeved on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the sleeve 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is clamped on the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both matched with the diameter of the outer stepped shaft of the fixed shaft 14. The second sleeve 16 is sleeved on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both clamped on the second sleeve 16. The thrust device 34 is sleeved on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0037] Embodiment 3: The device for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises a chassis 25, a measuring device 56 is fixed on the upper surface of the chassis 25, support frames 1 are fixed on both sides of the measuring device 56 on the chassis 25, a driving device 46 is fixed between the tops of the two support frames 1, a moving device 35 is fixed on the opposite sides of the two support frames 1, a loading device 42 is fixed between the two moving devices 35, a ball screw 7 is provided on one of the support frames 1 and one end of the ball screw 7 is hinged to the driving device 46, a screw nut 8 is provided on the ball screw 7, and the screw nut 8 is fixedly connected to the corresponding moving device 35; it also comprises a fixed shaft 14, one end of the fixed shaft 14 is hinged to the driving device 46 and the fixed shaft 14 passes through the loading device 42, and the other end of the fixed shaft 14 is sleeved with a thrust device 34 fixedly connected to the loading device 42.

[0038] A first groove 36 is provided on the chassis 25 at a position between the two support frames 1, the first groove 36 has a groove depth of 3 mm, and a positioning pin hole 32 is provided at the bottom of the first groove 36; the measuring device 56 includes a base 24, the base 24 is adapted to the shape and size of the first groove 36, the bottom of the base 24 is fixed in the first groove 36 and the rest of the base 24 is located outside the first groove 36, the upper surface of the base 24 is provided with 6 second grooves 55, the bottom of the second groove 55 is fixed with a first gasket 28, and the measuring device 56 also includes a shell 17, the bottom of the shell 17 is Six piezoelectric sensors 23 are fixed on the shell 17, and a first sleeve 27 that matches the shape and size of the second groove 55 is sleeved on the piezoelectric sensor 23. The piezoelectric sensors 23 are fixed in the second groove 55 one by one, and the bottom of the first sleeve 27 and the bottom of the piezoelectric sensor 23 are fixed on the first gasket 28. An oil inlet 37 is provided on one side of the shell 17, and an oil outlet 38 is provided on the other side of the shell 17. A third groove 53 is provided on the surface of the shell 17, and three fourth grooves 54 are provided at the bottom of the third groove 53. A heating ring 18 is provided in the fourth groove 54.

[0039] The driving device 46 includes a top plate 29, the bottom surface of the top plate 29 is fixed between the tops of the two support frames 1, a mounting plate 2 is fixed on the top surface of the top plate 29 and the mounting plate 2 is located directly above the ball screw 7, a stepper motor 3 is fixed on the mounting plate 2, and an upward button 39, a stop button 40, and a downward button 41 are provided on the stepper motor 3, and a bearing seat 9 is fixed on the side of the support frame 1 where the ball screw 7 is located, and one end of the ball screw 7 is hinged to the bearing seat 9, and the other end of the ball screw 7 is hinged to the bearing seat 9. The end passes through the top plate 29 and the mounting plate 2 and is hinged to the stepper motor 3. The up button 39, the stop button 40 and the down button 41 are electrically connected to the ball screw 7 respectively; a servo motor 4 is fixed on the top surface of the top plate 29 at a position just above the fixed shaft 14, and one end of the spline shaft 43 is hinged to the bottom of the servo motor 4, and the other end of the spline shaft 43 passes through the top plate 29. A spline groove 44 is provided at one end of the fixed shaft 14 and the spline shaft 43 is fixed in the spline groove 44, and the spline groove 44 has a depth of 40 mm.

[0040] The moving device 35 includes two guide rails 5. A guide rail 5 is fixed on each of the support frames 1 on both sides of the ball screw 7 and the guide rails 5 are parallel to the ball screw 7. A slider 6 is sleeved on the guide rail 5. The two sliders 6 are commonly fixed to one side of a moving plate 11. The screw nut 8 is fixedly connected to the corresponding moving plate 11. The loading device 42 is fixed between the two moving plates 11.

[0041] The loading device 42 includes a support plate 15, the support plate 15 is fixed between the two moving plates 11 and the support plate 15 is parallel to the top plate 29, a fifth groove 33 is provided on the surface of the support plate 15 close to the top plate 29, the fifth groove 33 has a groove depth of 3mm, the fixed shaft 14 passes through the support plate 15 from the fifth groove 33, a bidirectional thrust ball bearing 12 is sleeved around the fixed shaft 14 in the fifth groove 33, and the bidirectional thrust ball bearing 12 includes a first seat ring 47, a first steel ball assembly 48, a shaft ring 49, a second seat ring 50, and a second steel ball assembly 51 that are fixed together in sequence, the bottom of the first seat ring 47 is fixed in the fifth groove 33, and the rest of the first seat ring 47, the first steel ball assembly 48, the shaft ring 49, the second seat ring 50, and the second steel ball assembly 51 are all located in the fifth groove 33. Outside the groove 33, a sleeve 13 is sleeved on the outer side of the bidirectional thrust ball bearing 12 and the bottom of the sleeve 13 is fixed on the support plate 15. The fixed shaft 14 is a two-stage stepped shaft structure. One end of the fixed shaft 14 with a spline groove 44 is located on the outer stepped shaft. The shaft ring 49 is clamped on the inner stepped shaft of the fixed shaft 14. The inner diameter of the second seat ring 50 and the inner diameter of the second steel ball assembly 51 are both matched with the diameter of the outer stepped shaft of the fixed shaft 14. The second sleeve 16 is sleeved on the inner stepped shaft of the fixed shaft 14 and one end of the second sleeve 16 is fixed on the shaft ring 49. The first seat ring 47 and the first steel ball assembly 48 are both clamped on the second sleeve 16. The thrust device 34 is sleeved on one end of the inner stepped shaft of the fixed shaft 14 and the thrust device 34 is fixed to the other end of the second sleeve 16.

[0042] The thrust device 34 includes a thrust plate 19, the shape of which is adapted to the third groove 53 and the size of which is smaller than the third groove 53. A sixth groove 52 is provided on one side of the thrust plate 19. A second through hole 57 perpendicular to the bottom of the sixth groove 52 is provided on the thrust plate 19 from the bottom of the sixth groove 52 and the diameter of the second through hole 57 is adapted to the diameter of the inner stepped shaft of the fixed shaft 14. A second gasket 22 is fixed to the bottom of the sixth groove 52 by four screws 30 and the second gasket 22 covers the second through hole 57. One end of the inner stepped shaft of the fixed shaft 14 extends into the thrust plate 19 from the second through hole 57. The distance from the top of the shaft ring 49 to the top of the sleeve 13 is equal to the distance from the top surface of the second gasket 22 to the top of the thrust plate 19.

[0043] Embodiment 4: The method for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises the following steps: Step 1: Start the stepper motor 3, and move the lead screw nut 8 upward through the upward button 39, thereby driving a moving plate 11 to move upward. The moving plate 11 transmits force to the support plate 15 and then drives another moving plate 11 to move upward. The force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move upward. Six sliding bearings 26 are placed equidistantly at the bottom of the third groove 53, and 10 waveguide plates 20 with a thickness of 1 mm are attached to the surface of each sliding bearing 26. The surface of the sliding bearing 26 and all the waveguide plates 20 are coated with a babbitt alloy coating 31; Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to room temperature, start the stepper motor 3, and move the screw nut 8 downward through the downward button 41, thereby driving a movable plate 11 to move downward, and the movable plate 11 transmits the force to the support plate 15 and then drives the other movable plate 11 to move downward, and the force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move downward, and at the same time, start the servo motor 4 to make the fixed shaft 14 drive the thrust plate 19 to rotate, and collect the guided wave signals of the oil film pressure and the oil film thickness through the piezoelectric sensor 23. After each collection, adjust the downward position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-2 0MPa, the collected oil film thickness is maintained at 10μm-200μm, and the thrust device 34 is adjusted each time to make the oil film pressure collected by the piezoelectric sensor 23 change by 1MPa and the collected oil film thickness change by 10μm. Different oil film thicknesses and pressures correspond to different waveguide signals. The waveguide signal is decoupled by using the convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the change of the waveguide signal waveform, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the change of the waveguide signal waveform. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a waveguide signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

[0044] Embodiment 5: The method for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises the following steps: Step 1: Start the stepper motor 3, and move the lead screw nut 8 upward through the upward button 39, thereby driving a moving plate 11 to move upward. The moving plate 11 transmits force to the support plate 15 and then drives another moving plate 11 to move upward. The force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move upward. Eight sliding bearings 26 are placed equidistantly at the bottom of the third groove 53, and six waveguides 20 with a thickness of 2 mm are attached to the surface of each sliding bearing 26. The surface of the sliding bearing 26 and all the waveguides 20 are coated with a babbitt alloy coating 31; Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to 50°C, start the stepper motor 3, and move the screw nut 8 downward through the downward button 41, thereby driving a movable plate 11 to move downward. The movable plate 11 transmits the force to the support plate 15 and then drives the other movable plate 11 to move downward. The force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move downward. At the same time, start the servo motor 4 to make the fixed shaft 14 drive the thrust plate 19 to rotate, and collect the guided wave signals of the oil film pressure and the oil film thickness through the piezoelectric sensor 23. After each collection, adjust the downward position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-20 MPa, and the collected oil film thickness is maintained at 10μm-200μm. Each time the thrust device 34 is adjusted, the oil film pressure collected by the piezoelectric sensor 23 changes by 1.5MPa and the collected oil film thickness changes by 15μm. Different oil film thicknesses and pressures correspond to different waveguide signals. The waveguide signal is decoupled by using the convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the change of the waveguide signal waveform, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the change of the waveguide signal waveform. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a waveguide signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

[0045] Embodiment 6: The method for measuring the oil film pressure and thickness on the surface of a sliding bearing comprises the following steps: Step 1: Start the stepper motor 3, and move the lead screw nut 8 upward through the upward button 39, thereby driving a moving plate 11 to move upward, and the moving plate 11 transmits the force to the support plate 15 and then drives another moving plate 11 to move upward, and the force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move upward, and 10 sliding bearings 26 are placed equidistantly at the bottom of the third groove 53, and 6 waveguides 20 with a thickness of 3 mm are attached to the surface of each sliding bearing 26, and the surface of the sliding bearing 26 and all the waveguides 20 are coated with a babbitt alloy coating 31; Step 2: Connect the heating ring 18 to the power supply and control the temperature in the third groove 53 to 80°C, start the stepper motor 3, and move the screw nut 8 downward through the downward button 41, thereby driving a movable plate 11 to move downward. The movable plate 11 transmits the force to the support plate 15 and then drives the other movable plate 11 to move downward. The force is transmitted to the sleeve 13 and the bidirectional thrust ball bearing 12 in turn, and then drives the second sleeve 16 and the thrust plate 19 to move downward. At the same time, start the servo motor 4 to make the fixed shaft 14 drive the thrust plate 19 to rotate, and collect the guided wave signals of the oil film pressure and the oil film thickness through the piezoelectric sensor 23. After each collection, adjust the downward position of the thrust device 34 to keep the oil film pressure collected by the piezoelectric sensor 23 at 1MPa-2 0MPa, the collected oil film thickness is maintained at 10μm-200μm, each time the thrust device 34 is adjusted, the oil film pressure collected by the piezoelectric sensor 23 changes by 2MPa, and the collected oil film thickness changes by 20μm. Different oil film thicknesses and pressures correspond to different waveguide signals. The waveguide signal is decoupled by using the convolutional neural network in deep learning to obtain the relationship between the pressure distribution on the surface of the sliding bearing 26 and the change of the waveguide signal waveform, as well as the relationship between the oil film thickness on the surface of the sliding bearing 26 and the change of the waveguide signal waveform. Thus, pressure distribution imaging and oil film thickness imaging are performed on the surface of the sliding bearing 26, and a waveguide signal library is established. The pressure distribution and oil film thickness at any point on the surface of the sliding bearing 26 are obtained to complete the measurement.

Claims

1. A device for measuring the oil film pressure and thickness on the surface of a sliding bearing, characterized in that: The invention comprises a chassis (25), a measuring device (56) being fixed on the upper surface of the chassis (25), support frames (1) being fixed on both sides of the measuring device (56) on the chassis (25), a driving device (46) being fixed between the tops of the two support frames (1), a moving device (35) being fixed on opposite sides of the two support frames (1), a loading device (42) being fixed between the two moving devices (35), a ball screw (7) being provided on one of the support frames (1), one end of the ball screw (7) being hinged to the driving device (46), a screw nut (8) being provided on the ball screw (7), and the screw nut (8) being fixedly connected to the corresponding moving device (35); and a fixed shaft (14), one end of the fixed shaft (14) being hinged to the driving device (46), the fixed shaft (14) passing through the loading device (42), and the other end of the fixed shaft (14) being sleeved with a thrust device (34) fixedly connected to the loading device (42).

2. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 1, characterized in that: A first groove (36) is provided on the chassis (25) at a position between the two support frames (1); the first groove (36) has a groove depth of 1 mm to 3 mm, and a positioning pin hole (32) is provided at the bottom of the first groove (36); the measuring device (56) comprises a base (24); the base (24) matches the shape and size of the first groove (36); the bottom of the base (24) is fixed in the first groove (36) and the rest of the base (24) is located outside the first groove (36); a plurality of second grooves (55) are provided on the upper surface of the base (24); a first gasket (28) is fixed at the bottom of the second groove (55); and the measuring device (56) further comprises a shell (17); a plurality of pressure gauges (28) are fixed at the bottom of the shell (17). The invention relates to an electric sensor (23), and the number of the piezoelectric sensors (23) is the same as the number of the second grooves (55); the piezoelectric sensors (23) are sleeved with a first sleeve (27) whose shape and size match the second grooves (55); the piezoelectric sensors (23) are fixed in the second grooves (55) in a one-to-one correspondence; the bottom of the first sleeve (27) and the bottom of the piezoelectric sensor (23) are both fixed on a first gasket (28); an oil inlet (37) is provided on one side of the shell (17); an oil outlet (38) is provided on the other side of the shell (17); a third groove (53) is provided on the surface of the shell (17); a plurality of fourth grooves (54) are provided at the bottom of the third groove (53); and a heating ring (18) is provided in the fourth groove (54).

3. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 2, characterized in that: The driving device (46) comprises a top plate (29), the bottom surface of the top plate (29) being fixed between the tops of the two support frames (1), a mounting plate (2) being fixed on the top surface of the top plate (29) and the mounting plate (2) being located directly above the ball screw (7), a stepping motor (3) being fixed on the mounting plate (2), an upward button (39), a stop button (40) and a downward button (41) being provided on the stepping motor (3), a bearing seat (9) being fixed on the side of the support frame (1) on which the ball screw (7) is located and one end of the ball screw (7) is hinged to the bearing seat (9), and the other end of the ball screw (7) is connected to the bearing seat (9). After passing through the top plate (29) and the mounting plate (2), the top plate (2) is hinged on the stepping motor (3); the upward button (39), the stop button (40), and the downward button (41) are electrically connected to the ball screw (7) respectively; a servo motor (4) is fixed on the top surface of the top plate (29) at a position directly above the fixed shaft (14); one end of a spline shaft (43) is hinged on the bottom of the servo motor (4); the other end of the spline shaft (43) passes through the top plate (29); a spline groove (44) is formed at one end of the fixed shaft (14) and the spline shaft (43) is fixed in the spline groove (44); the spline groove (44) has a groove depth of 30 mm to 40 mm.

4. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 3, characterized in that: A plurality of pads (21) are fixed between the support frame (1) and the chassis (25), a grating ruler (10) is provided on one side of one of the support frames (1) in a direction perpendicular to the chassis (25), and a plurality of first through holes (45) are provided at positions other than the support frame (1) on which the moving device (35), the grating ruler (10), the bearing seat (9), and the ball screw (7) are mounted.

5. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 3 or 4, characterized in that: The moving device (35) comprises two guide rails (5), one of the guide rails (5) being fixed on each of the support frames (1) on both sides of the ball screw (7), and the guide rails (5) being parallel to the ball screw (7), a slider (6) being sleeved on the guide rails (5), the two sliders (6) being fixed to one side of a moving plate (11), a screw nut (8) being fixed to the corresponding moving plate (11), and a loading device (42) being fixed between the two moving plates (11).

6. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 5, characterized in that: The loading device (42) comprises a support plate (15), wherein the support plate (15) is fixed between the two movable plates (11) and the support plate (15) is parallel to the top plate (29); a fifth groove (33) is provided on a surface of the support plate (15) close to the top plate (29); the fifth groove (33) has a groove depth of 1 mm to 3 mm; a fixed shaft (14) passes through the support plate (15) from the fifth groove (33); a bidirectional thrust ball bearing (12) is sleeved around the fixed shaft (14) in the fifth groove (33); the bidirectional thrust ball bearing (12) comprises a first seat ring (47), a first steel ball assembly (48), a shaft ring (49), a second seat ring (50), and a second steel ball assembly (51) which are fixed together in sequence; the bottom of the first seat ring (47) is fixed in the fifth groove (33); the remaining parts of the first seat ring (47), the first steel ball assembly (48), the shaft ring (49), the second seat ring (50), and the second The steel ball assemblies (51) are all located outside the fifth groove (33); the outer side of the bidirectional thrust ball bearing (12) is provided with a shaft sleeve (13) and the bottom of the shaft sleeve (13) is fixed on the support plate (15); the fixed shaft (14) is a two-stage stepped shaft structure; one end of the fixed shaft (14) having a spline groove (44) is located on the outer stepped shaft; the shaft ring (49) is clamped on the inner stepped shaft of the fixed shaft (14); the inner diameter of the second seat ring (50) and the second steel ball assembly (51) are The inner diameter of the fixed shaft (14) is matched with the diameter of the outer stepped shaft of the fixed shaft (14), a second sleeve (16) is sleeved on the inner stepped shaft of the fixed shaft (14), and one end of the second sleeve (16) is fixed on the shaft ring (49), the first seat ring (47) and the first steel ball assembly (48) are both clamped on the second sleeve (16), and the thrust device (34) is sleeved on one end of the inner stepped shaft of the fixed shaft (14), and the thrust device (34) is fixedly connected to the other end of the second sleeve (16).

7. The device for measuring the oil film pressure and thickness on the surface of a sliding bearing according to claim 6, characterized in that: The thrust device (34) comprises a thrust plate (19), the shape of the thrust plate (19) being matched with the third groove (53) and the size of the thrust plate (19) being not larger than the third groove (53), a sixth groove (52) being provided on one side of the thrust plate (19), a second through hole (57) being provided on the thrust plate (19) from the bottom of the sixth groove (52) and being perpendicular to the bottom of the sixth groove (52), and the diameter of the second through hole (57) being matched with the diameter of the inner stepped shaft of the fixed shaft (14), a second gasket (22) being fixed on the bottom of the sixth groove (52) by a plurality of screws (30), and the second gasket (22) covering the second through hole (57), one end of the inner stepped shaft of the fixed shaft (14) extending from the second through hole (57) into the thrust plate (19), and the distance from the top of the shaft ring (49) to the top of the shaft sleeve (13) being not larger than the distance from the top surface of the second gasket (22) to the top of the thrust plate (19).

8. A method for measuring the oil film pressure and thickness on the surface of a sliding bearing, characterized in that: The device for measuring the oil film pressure and thickness on the surface of the sliding bearing described in claim 7 comprises the following steps: Step 1: Start the stepper motor (3) to move the lead screw nut (8) upward, thereby driving the moving device (35), the loading device (42), and the thrust device (34) to move upward in sequence, placing a plurality of sliding bearings (26) at equal intervals on the bottom of the third groove (53), attaching a plurality of waveguides (20) to the surface of each sliding bearing (26), and coating the surface of the sliding bearing (26) and all the waveguides (20) with a babbitt alloy coating (31); Step 2: Connect the heating ring (18) to a power source and heat the third groove (53), start the stepper motor (3) to move the thrust device (34) downward, and simultaneously start the servo motor (4) to rotate the fixed shaft (14) and the thrust plate (19), adjust the downward position of the thrust device (34), and collect the guided wave signals of the oil film pressure and the oil film thickness through the piezoelectric sensor (23).

9. The method for measuring the oil film pressure and thickness on the sliding bearing surface according to claim 8, characterized in that: In step 1, the upward movement button (39) is used to move the lead screw nut (8) upward, thereby driving a movable plate (11) upward, and the movable plate (11) transmits force to the support plate (15) and then drives another movable plate (11) upward, and the force is transmitted to the shaft sleeve (13) and the bidirectional thrust ball bearing (12) in turn, and then drives the second sleeve (16) and the thrust plate (19) upward; the thickness of the waveguide (20) is 1 mm-3 mm.

10. The method for measuring the oil film pressure and thickness on the sliding bearing surface according to claim 8, characterized in that: The step 2 is specifically performed as follows: Step 2.1, connect the heating ring (18) to a power source and control the temperature in the third groove (53) to between room temperature and 80°C; Step 2.2, the screw nut (8) is moved downward by pressing the downward button (41), thereby driving a movable plate (11) to move downward, the movable plate (11) transmits force to the support plate (15), and then drives another movable plate (11) to move downward, and the force is transmitted to the sleeve (13), the bidirectional thrust ball bearing (12), and then drives the second sleeve (16) and the thrust plate (19) to move downward, and at the same time, the servo motor (4) is started to make the fixed shaft (14) drive the thrust plate (19) to rotate; Step 2.3, collecting the waveguide signals of the oil film pressure and the oil film thickness through the piezoelectric sensor (23), adjusting the downward position of the thrust device (34) after each collection so that the oil film pressure collected by the piezoelectric sensor (23) is maintained at 1MPa-20MPa, and the collected oil film thickness is maintained at 10μm-200μm, and adjusting the thrust device (34) each time so that the oil film pressure collected by the piezoelectric sensor (23) changes by 1MPa-2MPa, and the collected oil film thickness changes by 10μm-20μm, and decoupling the waveguide signal by using the convolutional neural network in deep learning, and obtaining the relationship between the pressure distribution on the surface of the sliding bearing (26) and the change in the waveguide signal waveform, and the relationship between the oil film thickness on the surface of the sliding bearing (26) and the change in the waveguide signal waveform, and obtaining the pressure distribution and oil film thickness at any point on the surface of the sliding bearing (26), and completing the measurement.

Images