A device and method for measuring the thickness of a sliding bearing oil film

Abstract

The application relates to the technical field of laser measuring instruments, in particular to a device and method for measuring the thickness of a sliding bearing oil film. The device comprises a supporting ring fixed to a workbench, a sliding frame slidingly connected to the supporting ring, a first threaded rod rotationally connected to the supporting ring, the first threaded rod being threadedly connected to the sliding frame, an optical measuring head arranged on the sliding frame, a motor installed in the workbench, a rotating shaft fixed to an output shaft of the motor, and a friction frame arranged on the supporting ring. The flexible member and the sliding block are both in friction with the sliding bearing, the frictional force acting on the sliding bearing in the actual use process is simulated, the viscosity and thickness of the sliding bearing oil film are prevented from changing after being subjected to friction in the use process, the phenomenon that the reference of the oil film measurement result is poor is avoided, and the diversity and accuracy of the sliding bearing oil film thickness measurement are improved.

Description

Technical Field

[0001] This invention relates to the field of laser measuring instrument technology, and more specifically, to a device and method for measuring the thickness of oil film in sliding bearings. Background Technology

[0002] As a core component of rotating machinery, the oil film thickness of sliding bearings directly affects the operating efficiency and lifespan of the equipment. In existing technologies, optical interferometry measurement devices are widely used for measuring the oil film thickness of sliding bearing samples due to their non-contact and high-precision characteristics. This involves sampling sliding bearings from the same batch and measuring the oil film thickness on the samples. However, existing measurement devices have the drawback of static measurement being detached from actual operating conditions. Since oil film measurement requires a stable operating environment to ensure the accuracy of the measurement results, existing equipment measures the oil film thickness of sliding bearings under static conditions. However, sliding bearings are continuously affected by friction during actual use. Friction-induced temperature rise can reduce the viscosity of lubricating oil by more than 30%, which leads to changes in the viscosity and thickness of the grease on the sliding bearing. This results in deviations between the static measurement results and the actual operating conditions, thus affecting the accuracy of the measurement data. Summary of the Invention

[0003] In order to overcome the shortcomings pointed out in the background art above, the present invention provides an apparatus and method for measuring the thickness of oil film in sliding bearings.

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

[0005] Preferably, a flexible element is fixed to the friction frame near the rotation axis.

[0006] Preferably, the support ring is threaded with a second threaded rod near 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 part of which is made of a flexible material, and the sliding block is in contact with the flexible component.

[0008] Preferably, the sliding frame is slidably connected to a connecting block, the connecting block is fixedly connected to an arc-shaped frame, a sliding pin is slidably connected inside the arc-shaped frame, the sliding pin is fixedly connected to the optical measuring head, the arc-shaped frame is provided with a plurality of holes, and a locking pin is detachably connected inside the holes, the locking pin passes through the holes of the arc-shaped 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, the second guide surface being used to guide the first guide surface.

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

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

[0012] Preferably, a flexible pressure block is fixed to the fixing frame near the motor.

[0013] A method for measuring the oil film thickness of a sliding bearing, based on the aforementioned apparatus for measuring the oil film thickness of a sliding bearing, comprises the following specific steps: Step 1: When it is necessary to measure the oil film thickness of the sliding bearing, rotate the second threaded rod so that the second threaded rod drives the friction frame and its parts to move upward and separate from the support ring, and rotate the fixed frame so that the fixed frame moves upward and gradually separates from the rotating shaft; Step 2: Place the sliding bearing on the rotating shaft, rotate the fixed frame in the opposite direction, the fixed frame drives the flexible pressure block to move downward, the flexible pressure block gradually deforms and fixes the sliding bearing, then rotate the second threaded rod in the opposite direction to make the friction frame move, the friction frame drives the flexible part to move, and the flexible part and the sliding block are pressed against the sliding bearing. Step 3: After the flexible part is pressed against the sliding bearing, rotate the first threaded rod to make the sliding frame slide. The sliding frame drives the optical measuring head to slide. Adjust the position of the optical measuring head and measure the thickness of the oil film on the sliding bearing through the optical measuring head. Step 4: When it is necessary to measure the actual thickness of the sliding bearing oil film during the working process, turn on the motor. The output shaft of the motor drives the sliding bearing to rotate through the rotating shaft, so that the flexible parts and sliding blocks are both in contact with the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to friction, turn off the motor and turn on the optical measuring head. The optical measuring head measures the thickness of the oil film on the sliding bearing. Step 5: During the rotation of the sliding bearing, rotate the second threaded rod to cause the friction frame to move the flexible component up and down, thereby changing the magnitude of the squeezing force exerted by the flexible component on the sliding bearing. Step 6: When it is necessary to measure the oil film thickness on the outer circumferential 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, insert the locking pin, and 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 part is pressed against the outer peripheral side of the sliding bearing, so that the outer peripheral side of the sliding bearing rubs against the flexible part 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. The optical measuring head 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, turn off the optical measuring head and remove the sliding bearing.

[0014] The beneficial effects of the present invention using the above structure are as follows: The present invention simulates the situation where the sliding bearing is affected by friction during actual use by generating friction between the flexible component and the sliding block and the sliding bearing. This reduces the phenomenon of poor reference value of oil film measurement results caused by changes in viscosity and thickness of the oil film after friction during use, thereby increasing the diversity and accuracy of oil film thickness measurement. When it is necessary to measure different sliding bearings under different usage environments, the second threaded rod is rotated to move the friction frame up and down, thereby changing the magnitude of the squeezing force exerted by the flexible component on the sliding bearing and adjusting the friction force on the sliding bearing during rotation. By using the flexible component to press against the outer peripheral side of the sliding bearing and adjusting the orientation of the optical measuring head, friction is generated between the outer peripheral side of the sliding bearing and the flexible component during rotation, simulating the situation where the outer peripheral side of the sliding bearing is affected by friction during actual use. This reduces the difference between the measurement results and the actual oil film thickness, thereby improving the accuracy of oil film thickness measurement. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional sectional view of the workbench of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the support ring, sliding frame, and friction frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the arc-shaped frame of the present invention; Figure 5 This is a three-dimensional structural diagram of the flexible component of the present invention; Figure 6 This is a three-dimensional structural diagram of the fixing frame of the present invention.

[0016] In the attached figures, the following are the reference numerals: 1-worktable, 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 Implementation

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

[0018] A device for measuring the thickness of the oil film in a sliding bearing, such as Figures 1-5 As shown, the system includes a support ring 2 fixed to a workbench 1. A control terminal (not shown) is mounted on the workbench 1. A sliding frame 3 is slidably connected to the support ring 2. A first threaded rod 4 is rotatably connected to the support ring 2, and the first threaded rod 4 is threadedly connected to the sliding frame 3. Figure 1 The right view serves as the reference for the rotation direction. Rotating the right end of the first threaded rod 4 clockwise moves the sliding frame 3 to the right, and rotating the right end of the first threaded rod 4 counterclockwise moves the sliding frame 3 to the left, thus adjusting the position of the sliding frame 3. The sliding frame 3 is equipped with an optical measuring head 5 electrically connected to the control terminal. The optical measuring head 5 emits a laser beam, causing interference phenomena by reflecting the laser beam on the upper and lower surfaces of the oil film, thereby measuring the oil film thickness. As the sliding frame 3 moves, it drives the optical measuring head 5 to move left and right, adjusting the position of the optical measuring head 5. A motor 6 electrically connected to the control terminal is installed inside the worktable 1. The output of the motor 6... A shaft passes through a support ring 2 and is fixedly connected to a rotating shaft 7. The output shaft of a motor 6 is used to drive the rotating shaft 7 to rotate. The rotating shaft 7 is used to place a sliding bearing. The support ring 2 is provided with a friction frame 8. The orthographic projection of the friction frame 8 behind it is T-shaped. A flexible member 9 is fixedly connected to the lower right part of the friction frame 8. The orthographic projection of the flexible member 9 behind it is L-shaped. During use, the sliding bearing is fitted onto the rotating shaft 7, and the flexible member 9 is made to fit tightly against the upper surface and side of the sliding bearing. A sliding block 11 is slidably connected to the friction frame 8. The lower part of the sliding block 11 is made of flexible material. The sliding block 11 fits against the flexible member 9. The sliding block 11 is used to embed into the recess between the inner and outer rings of the sliding bearing.

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

[0020] The specific working principle is as follows: When this device is needed to measure the thickness of the oil film on the sliding bearing, the operator rotates the second threaded rod 10 counterclockwise, causing the second threaded rod 10 to move upward. The second threaded rod 10 drives the friction frame 8 and its parts to move upward and separate from the support ring 2. Then, the operator puts the sliding bearing on the rotating shaft 7, rotates the second threaded rod 10 clockwise and pushes the friction frame 8 to the right, causing the friction frame 8 to move. 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 pressed tightly against the sliding bearing.

[0021] After the flexible part 9 and the sliding block 11 are pressed against the sliding bearing, the operator rotates the first threaded rod 4, causing the sliding frame 3 to 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 measuring point of the sliding bearing. The operator turns on the optical measuring head 5 through the control terminal. The optical measuring head 5 measures the thickness of the oil film on the sliding bearing. After 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 sliding bearing oil film during operation, the operator starts the motor 6 through the control terminal. The output shaft of the motor 6 drives the sliding bearing to rotate through the rotating shaft 7, causing friction between the flexible part 9 and the sliding block 11 and the sliding bearing. The operator rotates the second threaded rod 10, causing the friction frame 8 to move the flexible part 9 up and down. Under the premise that the flexible part 9 is in contact with the sliding bearing, the flexible part 9 deforms, changing the magnitude of the squeezing force exerted by the flexible part 9 on the sliding bearing, thus adjusting the friction force on 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 measures the thickness of the oil film on the sliding bearing. By simulating the situation of the sliding bearing being affected by friction during actual use, the operator reduces the phenomenon of poor reference of the oil film measurement results caused by changes in the viscosity and thickness of the oil film after friction during use, thereby increasing the diversity and accuracy of the sliding bearing oil film thickness measurement.

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

[0024] Based on Example 1, such as Figures 2-4 As shown, the sliding frame 3 is slidably connected to the connecting block 12, and the connecting block 12 is fixedly connected to the arc-shaped frame 13. A sliding pin 14 is slidably connected inside the arc-shaped frame 13. The sliding pin 14 moves along a quarter-circle arc within the arc-shaped frame 13. The sliding pin 14 is fixedly connected to the optical measuring head 5. The arc-shaped frame 13 has two holes with horizontal central axes. A locking pin 15 is detachably connected to each hole. The locking pin 15 passes through adjacent holes in the arc-shaped frame 13 and is used to lock the sliding pin 14. Circular holes are provided on the left and lower sides of the sliding pin 14. Initially, the sliding pin 14 is located at the upper limit position inside the arc frame 13. The upper locking pin 15 passes through the upper hole of the arc frame 13 and is inserted into the round hole on the left side of the sliding pin 14 to lock the position of the sliding pin 14. When it is necessary to adjust the position of the sliding pin 14, pull out the two locking pins 15, move the sliding pin 14 to the lower limit position inside the arc frame 13, and then insert the two locking pins 15. The lower locking pin 15 passes through the lower hole of the arc frame 13 and is inserted into the round 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, the lower part of the T-shaped friction frame 8 is provided with a first guide surface 16, which is an inclined surface. The support ring 2 is provided with a second guide surface 17 near the first guide surface 16, which is also an inclined surface. When the friction frame 8 moves downward, the second guide surface 17 guides the first guide surface 16, causing the first guide surface 16 to move 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 circumferential side of the sliding bearing, the operator pulls out 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 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 limit position on the lower side of the arc frame 13, the sliding pin 14 drives the optical measuring head 5 to rotate 90°, 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 thickness of the oil film on the outer peripheral side of the sliding bearing. After 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 outer circumferential 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, causing the second threaded rod 10 to drive the friction frame 8 downward. During the downward 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 to the right during the downward movement. The friction frame 8 drives the flexible part 9 to move to the lower right, and the flexible part 9 is pressed against the outer circumferential side of the sliding bearing. The operator starts the motor 6 through the control terminal, and the motor 6 repeats the above steps to drive the bearing through the rotating shaft 7. When the sliding bearing rotates, friction occurs between its outer peripheral surface and the flexible component 9. As the thickness and viscosity of the oil film on the sliding bearing change due to friction, the operator shuts off the motor 6 and turns on the optical measuring head 5 via 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 surface of the sliding bearing, simulating the situation where the outer peripheral surface of the sliding bearing is affected by friction during actual use. This reduces the difference between the measurement result and the actual oil film thickness in actual use, thereby improving the accuracy of the oil film thickness measurement of the sliding bearing.

[0029] After the sliding bearing oil film measurement 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, reset the second threaded rod 10 and its parts, and 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, inserts the two locking pins 15, and 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] Based on Example 2, such as Figure 3 As shown, the diameter of the rotating shaft 7 gradually increases from top to bottom to accommodate the inner diameter of different types of sliding bearings, thereby achieving the fixation of different types of sliding bearings.

[0031] like Figure 3 and Figure 6 As shown, the rotating shaft 7 is threadedly connected to a fixing bracket 18, so as to... Figure 1The top view serves as the reference for the rotation direction. When the fixed frame 18 rotates clockwise, it moves downward; when it rotates counterclockwise, it moves upward. A flexible pressure block 19 is fixed to the lower side of the fixed frame 18. The flexible pressure block 19 is used to adhere to and press against the upper surface of the sliding bearing. When this device is needed to fix the sliding bearing, the operator rotates the fixed frame 18 counterclockwise, causing it to move upward and gradually disengage from the rotating shaft 7. Then, the sliding bearing is placed on the rotating shaft 7. The operator screws the fixed frame 18 into the rotating shaft 7 and rotates it clockwise, causing it to move downward. The fixed frame 18 drives the flexible pressure block 19 downward, which gradually presses against the sliding bearing. The flexible pressure block 19 deforms and fixes the sliding bearing, adapting to the fixing of sliding bearings with different inner diameters. This achieves the effect of fixing sliding bearings of different models, improving the applicability of this device. Example 4

[0032] Based on Example 3, such as Figures 1-6 As shown, a method for measuring the oil film thickness of a sliding bearing, based on the aforementioned apparatus for measuring the oil film thickness of a sliding bearing, comprises the following specific steps: Step 1: When it is necessary to measure the oil film thickness of the sliding bearing, rotate the second threaded rod 10 so that the second threaded rod 10 drives the friction frame 8 and its parts to move upward and separate from the support ring 2, and rotate the fixed frame 18 so that the fixed frame 18 moves upward and gradually separates from the rotating shaft 7. Step 2: Place the sliding bearing on the rotating shaft 7, rotate the fixed frame 18 in the opposite direction, the fixed frame 18 drives the flexible pressure block 19 to move downward, the flexible pressure block 19 gradually deforms and fixes the sliding bearing, then rotate the second threaded rod 10 in the opposite direction to make the friction frame 8 move, the friction frame 8 drives the flexible part 9 to move, the flexible part 9 and the sliding block 11 are pressed against the sliding bearing. Step 3: After the flexible part 9 is pressed against the sliding bearing, rotate the first threaded rod 4 to make the sliding frame 3 slide. The sliding frame 3 drives the optical measuring head 5 to slide. Adjust the position of the optical measuring head 5 and measure the thickness of the oil film on the sliding bearing through 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 the working process, turn on the motor 6. The output shaft of the motor 6 drives the sliding bearing to rotate through the rotating shaft 7, so that the flexible part 9 and the sliding block 11 both generate friction with the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to friction, turn off the motor 6 and turn on the optical measuring head 5. 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, rotate the second threaded rod 10, so that the friction frame 8 drives the flexible part 9 to move up and down, thereby changing the magnitude of the squeezing force generated by the flexible part 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 changes 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, causing the friction frame 8 to move obliquely. The flexible part 9 is pressed against the outer peripheral side of the sliding bearing, so that the outer peripheral side of the sliding bearing rubs against the flexible part 9 during rotation. When the thickness and viscosity of the oil film on the sliding bearing change due to 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 oil film measurement of the sliding bearing is completed, close the optical measuring head 5 and remove the sliding bearing.

[0033] The above are merely embodiments of the present invention and are not intended to limit the invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A device for measuring the thickness of an oil film in a sliding bearing, comprising a support ring (2) fixed to a worktable (1), the support ring (2) being slidably connected to a sliding frame (3), the support ring (2) being rotatably connected to a first threaded rod (4), the first threaded rod (4) being threadedly connected to the sliding frame (3), and the sliding frame (3) being provided with an optical measuring head (5), characterized in that, The workbench (1) is equipped with a motor (6), the output shaft of the motor (6) passes through the support ring (2) and is fixedly connected to a rotating shaft (7), and the support ring (2) is provided with a friction frame (8). A flexible component (9) is fixedly connected to the friction frame (8) near the rotating shaft (7). The support ring (2) is threaded with a second threaded rod (10) near the friction frame (8), and the second threaded rod (10) is slidably and rotatably connected to the friction frame (8); 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, and the sliding block (11) is in contact with the flexible part (9); 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) near the first guide surface (16). The second guide surface (17) is used to guide the first guide surface (16). When it is necessary to measure the oil film thickness of the sliding bearing, the sliding bearing is placed on the rotating shaft (7), and the motor (6) is turned on. The output shaft of the motor (6) drives the sliding bearing to rotate through the rotating shaft (7).

2. The device for measuring the oil film thickness of a sliding bearing according to claim 1, 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 inside 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 number of holes, a locking pin (15) is detachably connected inside the holes, the locking pin (15) passes through the holes of the arc frame (13) and is used to lock the sliding pin (14).

3. The device for measuring the oil film thickness of a sliding bearing according to claim 2, characterized in that, The diameter of the rotating shaft (7) gradually increases from top to bottom.

4. The device for measuring the oil film thickness of a sliding bearing according to claim 3, characterized in that, The rotating shaft (7) is threadedly connected to a fixing bracket (18).

5. The device for measuring the thickness of oil film in a sliding bearing according to claim 4, characterized in that, A flexible pressure block (19) is fixed to the fixed frame (18) near the motor (6).

6. A method for measuring the thickness of an oil film in a sliding bearing, using the apparatus for measuring the thickness of an oil film in a sliding bearing as described in claim 5, comprising the following specific steps: Step 1: When it is necessary to measure the oil film thickness of the sliding bearing, rotate the second threaded rod (10) so that the second threaded rod (10) drives the friction frame (8) and its parts to move upward and separate from the support ring (2), and rotate the fixed frame (18) so that the fixed frame (18) moves upward and gradually separates from the rotating shaft (7). Step 2: Place the sliding bearing on the rotating shaft (7), rotate the fixed frame (18) in the opposite direction, and the fixed frame (18) will drive the flexible pressure block (19) to move downward. The flexible pressure block (19) will gradually deform and fix the sliding bearing. Then rotate the second threaded rod (10) in the opposite direction to make the friction frame (8) move. The friction frame (8) will drive the flexible part (9) to move. The flexible part (9) and the sliding block (11) will stick to the sliding bearing. Step 3: After the flexible part (9) is attached to the sliding bearing, rotate the first threaded rod (4) to make the sliding frame (3) slide. The sliding frame (3) drives the optical measuring head (5) to slide. Adjust the position of the optical measuring head (5) and measure the thickness of the oil film on the sliding bearing through 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 the working process, turn on the motor (6). The output shaft of the motor (6) drives the sliding bearing to rotate through the rotating shaft (7), so that the flexible part (9) and the sliding block (11) both generate friction with the sliding bearing. When the thickness and viscosity of the oil film on the sliding bearing change due to friction, turn off the motor (6) and turn on the optical measuring head (5). 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, rotate the second threaded rod (10) so that the friction frame (8) drives the flexible part (9) to move up and down, thereby changing the magnitude of the squeezing force exerted by the flexible part (9) on the sliding bearing; Step 6: When it is necessary to measure the oil film thickness on the outer periphery 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) changes from a vertical state to a horizontal state, 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 part (9) is pressed against the outer peripheral side of the sliding bearing, so that the outer peripheral side of the sliding bearing rubs against the flexible part (9) during the rotation. When the thickness and viscosity of the oil film on the sliding bearing change due to 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 oil film measurement of the sliding bearing is completed, close the optical measuring head (5) and remove the sliding bearing.

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