Device and method for measuring thickness of oil film of sliding bearing

Abstract

The invention relates to the technical field of laser measuring instruments, in particular to a device and method for measuring the thickness of an oil film of a sliding bearing. Comprising a supporting ring fixedly connected to a working table, the supporting ring is in sliding connection with a sliding frame, the supporting ring is rotationally connected with a first threaded rod, the first threaded rod is in threaded connection with the sliding frame, the sliding frame is provided with an optical measuring head, a motor is installed in the working table, an output shaft of the motor is fixedly connected with a rotating shaft, and the rotating shaft is connected with the supporting ring. The supporting ring is provided with a friction frame. According to the invention, friction is generated between the flexible part and the sliding block and the sliding bearing, and the condition that the sliding bearing is influenced by friction force in the actual use process is simulated, so that the phenomenon that the reference of an oil film measurement result is poor as the viscosity and thickness of the oil film of the sliding bearing are changed after the oil film is rubbed in the use process is reduced; diversity and accuracy of sliding bearing oil film thickness measurement are increased.

Description

Technical Field

[0001] The present invention relates to the technical field of laser measuring instruments, and more particularly to a device and method for measuring the oil film thickness of a sliding bearing. Background Art

[0002] As a core component of rotating machinery, the oil film thickness of sliding bearings directly affects the operating efficiency and life of the equipment. In the existing technology, measurement devices using optical interferometry are widely used in the oil film thickness measurement of sliding bearing samples due to their non-contact and high-precision characteristics. That is, after random inspection of sliding bearings from the same batch, the oil film thickness on the samples is measured. However, the existing measurement devices have the disadvantage of static measurement being deviated from the actual working conditions: since oil film measurement requires a stable operating environment to ensure the accuracy of the measurement results, the existing equipment measures the oil film thickness of sliding bearings under static conditions. Sliding bearings are continuously affected by friction during actual use. Frictional heating can cause the viscosity of the lubricating oil to drop by more than 30%, which will cause the viscosity and thickness of the grease on the sliding bearing to change, resulting in deviations between the static measurement results and the actual working conditions, thereby affecting the accuracy of the measurement data. Summary of the Invention

[0003] In order to overcome the shortcomings pointed out in the above background technology, the present invention provides a device and method for measuring the oil film thickness of a sliding bearing.

[0004] The technical solution of the present invention is: a device for measuring the oil film thickness of a sliding bearing, comprising a support ring fixed to a workbench, the support ring being slidably connected to a sliding frame, the support ring being rotatably connected to a first threaded rod, the first threaded rod being threadedly connected to the sliding frame, the sliding frame being provided with an optical measuring head, a motor being installed in the workbench, the output shaft of the motor passing through the support ring and being fixed to a rotating shaft, and the support ring being provided with a friction frame.

[0005] Preferably, a flexible member is fixedly connected to the friction frame at a position close to the rotating shaft.

[0006] Preferably, a second threaded rod is threadedly connected to the support ring at a position close to the friction frame, and the second threaded rod is slidably and rotatably connected to the friction frame.

[0007] Preferably, the friction frame is slidably connected to a sliding block, the lower portion of the sliding block is made of a flexible material, and the sliding block is in contact with the flexible member.

[0008] Preferably, the sliding frame is slidably connected to a connecting block, the connecting block is fixedly connected to an arc frame, a sliding pin is slidably connected inside the arc frame, the sliding pin is fixedly connected to the optical measuring head, the arc frame is provided with a plurality of holes, a locking pin is detachably connected to the hole, the locking pin passes through the hole of the arc frame and is used to lock the sliding pin.

[0009] Preferably, the friction frame is provided with a first guide surface, and the support ring is provided with a second guide surface near the first guide surface, and the second guide surface is used to guide the first guide surface.

[0010] Preferably, the diameter of the rotating shaft increases gradually from top to bottom.

[0011] Preferably, the rotating shaft is threadedly connected to a fixing bracket.

[0012] Preferably, a flexible pressing block is fixedly connected to a position of the fixing bracket close to the motor.

[0013] A method for measuring the oil film thickness of a sliding bearing is based on the above-mentioned device for measuring the oil film thickness of a sliding bearing, and the specific steps are as follows: Step 1: When the oil film thickness of the sliding bearing needs to be measured, the second threaded rod is rotated so that the second threaded rod drives the friction frame and its parts to move upward and separate from the support ring, and the fixed frame is rotated so that the fixed frame moves upward and gradually separates from the rotating shaft; Step 2: Sleeve the sliding bearing on the rotating shaft, rotate the fixing frame in the opposite direction, and the fixing frame drives the flexible pressing block to move downward. The flexible pressing block gradually deforms and fixes the sliding bearing. Then, rotate the second threaded rod in the opposite direction to move the friction frame, which drives the flexible member to move. The flexible member and the sliding block are pressed against the sliding bearing. Step 3: After the flexible member is in close contact with the sliding bearing, the first threaded rod is rotated to slide the sliding frame, which drives the optical measuring head to slide. The position of the optical measuring head is adjusted, and the oil film thickness on the sliding bearing is measured by the optical measuring head. Step 4: When it is necessary to measure the actual thickness of the oil film on the sliding bearing during operation, the motor is turned on. The output shaft of the motor drives the sliding bearing to rotate via the rotating shaft, causing friction between the flexible member and the sliding block and the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to the friction, the motor is turned off and the optical measuring head is turned on to measure the thickness of the oil film on the sliding bearing. Step 5: During the rotation of the sliding bearing, the second threaded rod is rotated so that the friction frame drives the flexible member to move up and down, thereby changing the magnitude of the extrusion force exerted by the flexible member on the sliding bearing; Step 6: When it is necessary to measure the oil film thickness on the outer peripheral side of the sliding bearing, pull out the locking pin, move the position of the sliding pin so that the optical measuring head changes from a vertical state to a horizontal state, and insert the locking pin to lock the position of the sliding pin; Step 7: During the movement of the friction frame, the first guide surface moves along the second guide surface, causing the friction frame to move obliquely. The flexible member is pressed against the outer peripheral side of the sliding bearing, causing friction between the outer peripheral side of the sliding bearing and the flexible member during rotation. When the thickness and viscosity of the oil film on the sliding bearing change due to friction, the motor is turned off and the optical measuring head is turned on to measure the thickness of the oil film on the outer peripheral side of the sliding bearing. Step 8: When the sliding bearing oil film measurement is completed, close the optical measuring head and remove the sliding bearing.

[0014] The advantageous effects achieved by the present invention using the above structure are as follows: the present invention generates friction between the flexible member and the sliding block and the sliding bearing, simulating the influence of friction on the sliding bearing during actual use, thereby reducing the phenomenon of poor reference of the oil film measurement results caused by changes in the viscosity and thickness of the sliding bearing oil film due to friction during use, thereby increasing the diversity and accuracy of the sliding bearing oil film thickness measurement. When it is necessary to measure different sliding bearings under different usage environments, the friction frame drives the flexible member up and down by rotating the second threaded rod to change the magnitude of the squeezing force generated by the flexible member on the sliding bearing, thereby adjusting the friction force experienced by the sliding bearing during rotation. The flexible member is pressed against the outer peripheral side of the sliding bearing, and the direction of the optical measuring head is adjusted to generate friction between the outer peripheral side of the sliding bearing and the flexible member during rotation, simulating the influence of friction on the outer peripheral side of the sliding bearing during actual use, thereby reducing the difference between the measured results and the oil film thickness in actual use, thereby improving the accuracy of the sliding bearing oil film thickness measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 A sectional view of the three-dimensional structure of the workbench of the present invention; Figure 3 A sectional view of the three-dimensional structure of the support ring, the sliding frame and the friction frame of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the arc frame of the present invention; Figure 5 Schematic diagram of the three-dimensional structure of the flexible member of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing frame of the present invention.

[0016] In the accompanying drawings: 1-workbench, 2-support ring, 3-sliding frame, 4-first threaded rod, 5-optical measuring head, 6-motor, 7-rotating shaft, 8-friction frame, 9-flexible part, 10-second threaded rod, 11-sliding block, 12-connecting block, 13-arc frame, 14-sliding pin, 15-locking pin, 16-first guide surface, 17-second guide surface, 18-fixed frame, 19-flexible pressure block. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0018] A device for measuring the thickness of oil film in sliding bearings, such as Figure 1-Figure 5 As shown, it includes a support ring 2 fixed to a workbench 1, the workbench 1 is equipped with a control terminal not shown in the figure, the support ring 2 is slidably connected to a sliding frame 3, the support ring 2 is rotatably connected to a first threaded rod 4, the first threaded rod 4 is threadedly connected to the sliding frame 3, Figure 1 The right view is the reference of the rotation direction. By rotating the right end of the first threaded rod 4 clockwise, the sliding frame 3 moves to the right. By rotating the right end of the first threaded rod 4 counterclockwise, the sliding frame 3 moves to the left. The position of the sliding frame 3 is adjusted. The sliding frame 3 is provided with an optical measuring head 5 electrically connected to the control terminal. The optical measuring head 5 emits a laser and causes the laser beam to reflect on the upper and lower surfaces of the oil film to produce interference to measure the thickness of the oil film. When the sliding frame 3 moves, the sliding frame 3 drives the optical measuring head 5 to move left and right. The position of the optical measuring head 5 is adjusted. A motor 6 electrically connected to the control terminal is installed in the workbench 1. The output of the motor 6 The shaft passes through the support ring 2 and is fixedly connected to the rotating shaft 7. The output shaft of the motor 6 is used to drive the rotating shaft 7 to rotate. The rotating shaft 7 is used to place the sliding bearing. The support ring 2 is provided with a friction frame 8. The friction frame 8 has a T-shaped projection at its rear. A flexible part 9 is fixed to the lower right part of the friction frame 8. The flexible part 9 has an L-shaped projection at its rear. During use, the sliding bearing is inserted into the rotating shaft 7, and the flexible part 9 is close to the upper surface and side of the sliding bearing. The friction frame 8 is slidably connected to a sliding block 11. The lower part of the sliding block 11 is made of flexible material. The sliding block 11 fits with the flexible part 9. The sliding block 11 is used to be embedded in the recess between the inner and outer rings of the sliding bearing.

[0019] like Figure 3 and Figure 5 As shown, the right side of the support ring 2 is threadedly connected with a second threaded rod 10, and the second threaded rod 10 is slidably and rotatably connected to the friction frame 8 to Figure 1 The top view is the reference of the rotation direction. When the second threaded rod 10 rotates clockwise, the second threaded rod 10 drives the friction frame 8 to move downward. When the second threaded rod 10 rotates counterclockwise, the second threaded rod 10 drives the friction frame 8 to move upward.

[0020] The specific working principle is as follows: When it is necessary to use this device to measure the thickness of the oil film on the sliding bearing, the operator rotates the second threaded rod 10 counterclockwise to move the second threaded rod 10 upward, and the second threaded rod 10 drives the friction frame 8 and the parts thereon to move upward and disengage from the support ring 2. Then the operator puts the sliding bearing on the rotating shaft 7, and then rotates the second threaded rod 10 clockwise and pushes the friction frame 8 to the right to move the friction frame 8. The friction frame 8 drives the flexible part 9 and the sliding block 11 to move. The operator presses the friction frame 8 so that the flexible part 9 and the sliding block 11 are close to the sliding bearing.

[0021] After the flexible member 9 and the sliding block 11 are in close contact with the sliding bearing, the operator rotates the first threaded rod 4 to make the sliding frame 3 slide left and right. The sliding frame 3 drives the optical measuring head 5 to slide left and right, so that the optical measuring head 5 is aligned with the measured part of the sliding bearing. The operator turns on the optical measuring head 5 through the control terminal. The optical measuring head 5 measures the oil film thickness on the sliding bearing. When the measurement is completed, the optical measuring head 5 is turned off through the control terminal.

[0022] When it is necessary to measure the actual thickness of the oil film on the sliding bearing during operation, the operator turns on the motor 6 through the control terminal. The output shaft of the motor 6 drives the sliding bearing to rotate via the rotating shaft 7, causing friction between the flexible member 9 and the sliding block 11 and the sliding bearing. The operator rotates the second threaded rod 10, causing the friction frame 8 to drive the flexible member 9 up and down. Under the premise that the flexible member 9 is in contact with the sliding bearing, the flexible member 9 is deformed, changing the magnitude of the squeezing force exerted by the flexible member 9 on the sliding bearing, thereby adjusting the friction force applied to the sliding bearing during rotation. When the thickness and viscosity of the oil film on the sliding bearing change due to friction, the operator turns off the motor 6 and turns on the optical measuring head 5 through the control terminal. The output shaft of the motor 6 stops rotating, so that the rotating shaft 7 no longer drives the sliding bearing to rotate. The optical measuring head 5 then measures the oil film thickness on the sliding bearing. By simulating the frictional force of the sliding bearing during actual use, the operator reduces the occurrence of poor reference of the oil film measurement results due to changes in the viscosity and thickness of the sliding bearing oil film due to friction during use, thereby increasing the diversity and accuracy of the sliding bearing oil film thickness measurement.

[0023] When the measurement of the sliding bearing oil film is completed, the operator turns off the motor 6 and the optical measuring head 5, and the operator rotates the second threaded rod 10 counterclockwise to move the second threaded rod 10 upward. The second threaded rod 10 drives the friction frame 8 upward, so that the flexible member 9 and the sliding block 11 are separated from the sliding bearing. The operator removes and collects the measured sliding bearing, and then rotates the second threaded rod 10 clockwise to drive the friction frame 8 and the parts thereon to move downward and reset. Example 2

[0024] On the basis of Example 1, Figure 2-Figure 4 As shown, the sliding frame 3 is slidably connected to the connecting block 12, the connecting block 12 is fixedly connected to the arc frame 13, and a sliding pin 14 is slidably connected to the arc frame 13. The moving trajectory of the sliding pin 14 in the arc frame 13 is an arc of a quarter circle. The sliding pin 14 is fixed to the optical measuring head 5. The arc frame 13 is provided with upper and lower holes with the central axis as a horizontal line. The hole is detachably connected to the locking pin 15, which passes through the adjacent holes of the arc frame 13 and is used to lock the sliding pin 14. The left side and the bottom side of the sliding pin 14 are respectively provided with circular holes. Initially, the sliding pin 14 is located at the upper limit position inside the arc frame 13, and the upper locking pin 15 passes through the upper hole of the arc frame 13 and is inserted into the circular hole on the left side of the sliding pin 14 to lock the position of the sliding pin 14. When the position of the sliding pin 14 needs to be adjusted, the two locking pins 15 are pulled out, and the sliding pin 14 is moved to the lower limit position inside the arc frame 13, and then the two locking pins 15 are inserted. The lower locking pin 15 passes through the lower hole of the arc frame 13 and is inserted into the circular hole on the lower side of the sliding pin 14 to lock the position of the sliding pin 14.

[0025] like Figure 5 As shown, a first guide surface 16 is provided at the lower part of the T-shaped friction frame 8, and the first guide surface 16 is an inclined surface. A second guide surface 17 is provided at a position of the support ring 2 close to the first guide surface 16, and the second guide surface 17 is an inclined surface. When the friction frame 8 moves downward, the second guide surface 17 guides the first guide surface 16, so that the first guide surface 16 moves to the right, and the friction frame 8 moves to the right relative to the second threaded rod 10.

[0026] The specific working principle is as follows: When it is necessary to measure the oil film thickness on the outer peripheral side of the sliding bearing, the operator pulls out the two locking pins 15 to the left, moves the sliding pin 14 to the lower limit position inside the arc frame 13, and then inserts the two locking pins 15. The lower locking pin 15 is inserted into the sliding pin 14 through the adjacent hole to lock the position of the sliding pin 14.

[0027] After the sliding pin 14 moves to the lower limit position inside the arc frame 13, the sliding pin 14 drives the optical measuring head 5 to rotate 90 degrees, so that the optical measuring head 5 changes from a vertical state to a horizontal state. At this time, the operator turns on the optical measuring head 5 through the control terminal. The optical measuring head 5 measures the oil film thickness on the outer peripheral side of the sliding bearing. When the measurement is completed, the operator turns off the optical measuring head 5 through the control terminal.

[0028] When it is necessary to measure the actual thickness of the oil film on the peripheral side of the sliding bearing during operation, the operator places the bearing according to the above steps and rotates the second threaded rod 10 clockwise, so that the second threaded rod 10 drives the friction frame 8 to move downward. During the downward movement of the friction frame 8, the first guide surface 16 moves along the second guide surface 17, so that the friction frame 8 moves to the right during the downward movement, and the friction frame 8 drives the flexible member 9 to move to the lower right. The flexible member 9 is close to the peripheral side of the sliding bearing. The operator turns on the motor 6 through the control terminal, and the motor 6 repeats the above steps to drive the rotating shaft 7 The sliding bearing rotates, and friction occurs between the outer peripheral side of the sliding bearing and the flexible member 9. When the thickness and viscosity of the oil film on the sliding bearing change due to the influence of friction, the operator turns off the motor 6 and turns on the optical measuring head 5 through the control terminal. The output shaft of the motor 6 stops rotating, so that the rotating shaft 7 no longer drives the sliding bearing to rotate. The optical measuring head 5 measures the thickness of the oil film on the outer peripheral side of the sliding bearing, simulating the situation in which the outer peripheral side of the sliding bearing is affected by friction during actual use, thereby narrowing the difference between the measurement result and the oil film thickness in actual use, thereby improving the accuracy of the oil film thickness measurement of the sliding bearing.

[0029] After the measurement of the sliding bearing oil film is completed, the operator turns off the motor 6 and the optical measuring head 5, and repeats the above steps to remove the sliding bearing and reset the second threaded rod 10 and the parts thereon. Then, the operator pulls out the two locking pins 15, moves the sliding pin 14 to the upper limit position inside the arc frame 13, and inserts the two locking pins 15. The upper locking pin 15 is inserted into the sliding pin 14 through the adjacent hole to lock the position of the sliding pin 14. Example 3

[0030] On the basis of Example 2, Figure 3 As shown, the diameter of the rotating shaft 7 gradually increases from top to bottom to adapt to the inner diameters of sliding bearings of different types, thereby achieving the fixation of sliding bearings of different types.

[0031] like Figure 3 and Figure 6 As shown, the rotating shaft 7 is threadedly connected to a fixing bracket 18. Figure 1The top view is the reference of the rotation direction. When the fixing frame 18 rotates clockwise, the fixing frame 18 moves downward. When the fixing frame 18 rotates counterclockwise, the fixing frame 18 moves upward. A flexible pressure block 19 is fixed to the lower side of the fixing frame 18. The flexible pressure block 19 is used to fit and press the upper surface of the sliding bearing. When it is necessary to use this device to fix the sliding bearing, the operator rotates the fixing frame 18 counterclockwise so that the fixing frame 18 moves upward and gradually disengages from the rotating shaft 7, and then the sliding bearing is sleeved on the rotating shaft 7. The operator screws the fixing frame 18 into the rotating shaft 7 and rotates the fixing frame 18 clockwise. The fixing frame 18 gradually moves downward, and the fixing frame 18 drives the flexible pressure block 19 to move downward. The flexible pressure block 19 gradually presses the sliding bearing. The flexible pressure block 19 deforms and fixes the sliding bearing to adapt to the fixation of sliding bearings with different inner diameters, thereby achieving the effect of fixing sliding bearings of different models and improving the scope of application of this device. Example 4

[0032] On the basis of Example 3, Figures 1-6 As shown, a method for measuring the oil film thickness of a sliding bearing is based on the above-mentioned device for measuring the oil film thickness of a sliding bearing, and the specific steps are as follows: Step 1: When the oil film thickness of the sliding bearing needs to be measured, the second threaded rod 10 is rotated so that the second threaded rod 10 drives the friction frame 8 and the parts thereon to move upward and separate from the support ring 2, and the fixing frame 18 is rotated so that the fixing frame 18 moves upward and gradually separates from the rotating shaft 7; Step 2: Sleeve the sliding bearing on the rotating shaft 7, rotate the fixing frame 18 in the opposite direction, the fixing frame 18 drives the flexible pressing block 19 to move downward, the flexible pressing block 19 gradually deforms and fixes the sliding bearing, and then rotate the second threaded rod 10 in the opposite direction to move the friction frame 8, which drives the flexible member 9 to move, and the flexible member 9 and the sliding block 11 are pressed against the sliding bearing; Step 3: After the flexible member 9 is in close contact with the sliding bearing, the first threaded rod 4 is rotated to slide the sliding frame 3, which in turn drives the optical measuring head 5 to slide. The position of the optical measuring head 5 is adjusted, and the oil film thickness on the sliding bearing is measured by the optical measuring head 5. Step 4: When it is necessary to measure the actual thickness of the oil film of the sliding bearing during operation, the motor 6 is turned on. The output shaft of the motor 6 drives the sliding bearing to rotate via the rotating shaft 7, so that friction is generated between the flexible member 9 and the sliding block 11 and the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to the friction, the motor 6 is turned off and the optical measuring head 5 is turned on. The optical measuring head 5 measures the thickness of the oil film on the sliding bearing. Step 5: During the rotation of the sliding bearing, the second threaded rod 10 is rotated, so that the friction frame 8 drives the flexible member 9 to move up and down, thereby changing the magnitude of the extrusion force exerted by the flexible member 9 on the sliding bearing; Step 6: When it is necessary to measure the oil film thickness on the outer peripheral side of the sliding bearing, pull out the locking pin 15, move the position of the sliding pin 14, so that the optical measuring head 5 is changed from a vertical state to a horizontal state, and insert the locking pin 15 to lock the position of the sliding pin 14; Step 7: During the movement of the friction frame 8, the first guide surface 16 moves along the second guide surface 17, causing the friction frame 8 to move obliquely. The flexible member 9 is in close contact with the outer peripheral side of the sliding bearing, causing friction between the outer peripheral side of the sliding bearing and the flexible member 9 during the rotation process. When the thickness and viscosity of the oil film on the sliding bearing change due to the friction, the motor 6 is turned off and the optical measuring head 5 is turned on. The optical measuring head 5 measures the thickness of the oil film on the outer peripheral side of the sliding bearing. Step 8: After the sliding bearing oil film measurement is completed, close the optical measuring head 5 and remove the sliding bearing.

[0033] The above is merely an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Any content not elaborated in detail in the present invention belongs to the prior art known to those skilled in the art.

Claims

1. A device for measuring the oil film thickness of a sliding bearing, comprising a support ring (2) fixed to a workbench (1), wherein the support ring (2) is slidably connected to a sliding frame (3), wherein the support ring (2) is rotatably connected to a first threaded rod (4), wherein the first threaded rod (4) is threadedly connected to the sliding frame (3), and wherein the sliding frame (3) is provided with an optical measuring head (5), wherein the device is characterized in that: A motor (6) is installed in the workbench (1); an output shaft of the motor (6) passes through the support ring (2) and is fixedly connected to a rotating shaft (7); and a friction frame (8) is provided on the support ring (2).

2. The device for measuring the oil film thickness of a sliding bearing according to claim 1, wherein: A flexible member (9) is fixedly connected to the friction frame (8) at a position close to the rotating shaft (7).

3. The device for measuring the oil film thickness of a sliding bearing according to claim 2, wherein: The support ring (2) is threadedly connected to a second threaded rod (10) at a position close to the friction frame (8), and the second threaded rod (10) is slidably and rotationally connected to the friction frame (8).

4. The device for measuring the oil film thickness of a sliding bearing according to claim 3, wherein: The friction frame (8) is slidably connected to a sliding block (11), the lower portion of the sliding block (11) is made of a flexible material, and the sliding block (11) is in contact with the flexible member (9).

5. The device for measuring the oil film thickness of a sliding bearing according to claim 4, characterized in that: The sliding frame (3) is slidably connected to a connecting block (12), the connecting block (12) is fixedly connected to an arc frame (13), a sliding pin (14) is slidably connected in the arc frame (13), the sliding pin (14) is fixedly connected to the optical measuring head (5), the arc frame (13) is provided with a plurality of holes, and a locking pin (15) is detachably connected in the holes, and the locking pin (15) passes through the holes of the arc frame (13) and is used to lock the sliding pin (14).

6. The device for measuring the oil film thickness of a sliding bearing according to claim 5, characterized in that: The friction frame (8) is provided with a first guide surface (16), and the support ring (2) is provided with a second guide surface (17) at a position close to the first guide surface (16), and the second guide surface (17) is used to guide the first guide surface (16).

7. The device for measuring the oil film thickness of a sliding bearing according to claim 6, characterized in that: The diameter of the rotating shaft (7) gradually increases from top to bottom.

8. The device for measuring the oil film thickness of a sliding bearing according to claim 7, wherein: The rotating shaft (7) is threadedly connected to a fixing frame (18).

9. The device for measuring the oil film thickness of a sliding bearing according to claim 8, characterized in that: A flexible pressing block (19) is fixedly connected to the fixing frame (18) at a position close to the motor (6).

10. A method for measuring the oil film thickness of a sliding bearing, using the device for measuring the oil film thickness of a sliding bearing according to claim 9, comprising the following steps: Step 1: When it is necessary to measure the oil film thickness of the sliding bearing, the second threaded rod (10) is rotated so that the second threaded rod (10) drives the friction frame (8) and the parts thereon to move upward and separate from the support ring (2), and the fixing frame (18) is rotated so that the fixing frame (18) moves upward and gradually separates from the rotating shaft (7); Step 2: Sleeve the sliding bearing on the rotating shaft (7), rotate the fixing frame (18) in the opposite direction, the fixing frame (18) drives the flexible pressing block (19) to move downward, the flexible pressing block (19) gradually deforms and fixes the sliding bearing, and then rotate the second threaded rod (10) in the opposite direction to move the friction frame (8), the friction frame (8) drives the flexible member (9) to move, and the flexible member (9) and the sliding block (11) are in close contact with the sliding bearing; Step 3: After the flexible member (9) is in close contact with the sliding bearing, the first threaded rod (4) is rotated to slide the sliding frame (3), and the sliding frame (3) drives the optical measuring head (5) to slide, and the position of the optical measuring head (5) is adjusted, and the oil film thickness on the sliding bearing is measured by the optical measuring head (5); Step 4: When it is necessary to measure the actual thickness of the oil film of the sliding bearing during operation, the motor (6) is turned on, and the output shaft of the motor (6) drives the sliding bearing to rotate through the rotating shaft (7), so that friction is generated between the flexible member (9) and the sliding block (11) and the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to the influence of friction, the motor (6) is turned off and the optical measuring head (5) is turned on. The optical measuring head (5) measures the thickness of the oil film on the sliding bearing. Step 5: During the rotation of the sliding bearing, the second threaded rod (10) is rotated, so that the friction frame (8) drives the flexible member (9) to move up and down, thereby changing the magnitude of the extrusion force generated by the flexible member (9) on the sliding bearing; Step 6: When it is necessary to measure the oil film thickness on the outer peripheral side of the sliding bearing, pull out the locking pin (15), move the position of the sliding pin (14), so that the optical measuring head (5) is changed from a vertical state to a horizontal state, insert the locking pin (15), and lock the position of the sliding pin (14); Step 7: During the movement of the friction frame (8), the first guide surface (16) moves along the second guide surface (17), so that the friction frame (8) moves obliquely, and the flexible member (9) is pressed against the outer peripheral side of the sliding bearing, so that the outer peripheral side of the sliding bearing and the flexible member (9) generate friction during the rotation process. When the thickness and viscosity of the oil film on the sliding bearing change due to the influence of friction, the motor (6) is turned off and the optical measuring head (5) is turned on. The optical measuring head (5) measures the thickness of the oil film on the outer peripheral side of the sliding bearing. Step 8: When the sliding bearing oil film measurement is completed, close the optical measuring head (5) and remove the sliding bearing.

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