Inspection method of bearing

Abstract

The inspection method of the bearing (12) includes a first application process, an installation process, and a detection process. In the first application process, the roller (24) is pressed against one of the shaft (11) and the component that rotates together with the shaft (11), thereby applying a first load to the shaft (11). In the installation process, the sensor (20) is installed on the component that vibrates due to the rotation of the shaft (11). In the detection process, the vibration is detected by the sensor (20) while rotating the shaft (11) after the installation process. The detection process is carried out after the first application process.

Description

Technical Field

[0001] The present disclosure relates to a method for inspecting a bearing that supports a shaft. Background Art

[0002] A device for detecting an abnormality of a bearing is described in Patent Document 1. The device described in Patent Document 1 includes a unit for converting mechanical vibration of the bearing into an electric signal. A vibration waveform is obtained from the electric signal. If there is a damage in the bearing, a peak appears in the vibration waveform at a frequency corresponding to the damage.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 2-205727 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] If the damage in the bearing is small, due to the influence of noise, a peak may not appear at a frequency corresponding to the damage. Therefore, in the device described in Patent Document 1, there is a problem that a damage in the initial stage of the bearing cannot be detected.

[0008] The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a method for inspecting a bearing that can accurately detect the presence of a damage even when the damage in the bearing is small.

[0009] Means for Solving the Problems

[0010] The method for inspecting a bearing according to the present disclosure includes: a first loading step of pressing a roller against one of a shaft and a member that rotates together with the shaft to apply a first load to the shaft; a mounting step of mounting a sensor on a member that vibrates due to the rotation of the shaft; and a detection step of detecting vibration by the sensor while rotating the shaft after the mounting step. The detection step is performed after the first loading step.

[0011] The method for inspecting a bearing according to the present disclosure includes: a braking step of pressing a first shoe against a braking member that rotates together with the shaft; a mounting step of mounting a sensor on a member that vibrates due to the rotation of the shaft; and a detection step of detecting vibration by the sensor while rotating the shaft after the mounting step. The detection step is performed after the braking step.

[0012] The inspection method of the bearing of the present disclosure includes: a setting process of setting the rotational speed of the shaft to be greater than the rated speed; a mounting process of mounting a sensor on a component that vibrates due to the rotation of the shaft; and a detection process of detecting vibration through the sensor while rotating the shaft after the mounting process. The detection process is carried out after the setting process.

[0013] The inspection method of the bearing of the present disclosure includes: an anti-lubrication process of removing the lubricating oil for the bearing and injecting a degreasing agent into the bearing; a mounting process of mounting a sensor on a component that vibrates due to the rotation of the shaft; and a detection process of detecting vibration through the sensor while rotating the shaft after the mounting process. The detection process is carried out after the anti-lubrication process.

[0014] Advantages of the Invention

[0015] According to the inspection method of the bearing of the present disclosure, even when the damage existing in the bearing is small, the presence of the damage can be detected with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a diagram showing an example of an elevator device.

[0017] Figure 2 It is a diagram showing an example of a traction machine.

[0018] Figure 3 It is a flowchart showing an example of the inspection method of the bearing in Embodiment 1.

[0019] Figure 4 It is a diagram for explaining the inspection method of the bearing.

[0020] Figure 5 It is a diagram showing an example of a pressing device.

[0021] Figure 6 It is a diagram showing an example of the load acting on the bearing.

[0022] Figure 7 It is a diagram for explaining another example of the application process.

[0023] Figure 8 It is a diagram showing another example of the load acting on the bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Hereinafter, a detailed description will be given with reference to the drawings. Repeated descriptions will be appropriately simplified or omitted. In each figure, the same reference numerals denote the same or corresponding parts.

[0025] Embodiment 1.

[0026] Figure 1This is a diagram showing an example of an elevator device. First, refer to Figure 1 to describe the elevator device. The elevator device includes a car 1 and a counterweight 2. The car 1 moves up and down in a hoistway 3. The counterweight 2 moves up and down in the hoistway 3. The car 1 and the counterweight 2 are suspended in the hoistway 3 by a rope 4. Figure 1 An elevator device with a 1:1 rope winding method is shown as an example.

[0027] A traction machine 5 drives the car 1. A control device 6 controls the traction machine 5. That is, the movement of the car 1 is controlled by the control device 6. Figure 1 An example is shown where the traction machine 5 and the control device 6 are arranged in a machine room 7 above the hoistway 3. The traction machine 5 and the control device 6 can also be arranged in the hoistway 3. The traction machine 5 can be arranged at the top of the hoistway 3 or in the pit of the hoistway 3.

[0028] Figure 2 This is a diagram showing an example of the traction machine 5. The traction machine 5 includes a motor 10 ( Figure 2 not shown in the figure), a shaft 11, bearings 12, a bearing housing 13, a machine base 14, a drive sheave 15, and a braking device 16.

[0029] The motor 10 generates a driving force for rotating the shaft 11. The shaft 11 is supported by the bearings 12 so as to be rotatable. In the Figure 2 example shown, the shaft 11 is supported by two bearings 12. The bearings 12 are arranged in the bearing housing 13. That is, the shaft 11 is arranged in the bearing housing 13 so as to be rotatable via the bearings 12. The bearing housing 13 is supported by the machine base 14. A vibration-proof member can also be arranged between the bearing housing 13 and the machine base 14.

[0030] The drive sheave 15 is arranged on the shaft 11. The drive sheave 15 rotates together with the shaft 11. The rope 4 is wound around the drive sheave 15. When the drive sheave 15 rotates, that is, when the shaft 11 rotates, the car 1 moves in a direction corresponding to the rotation direction of the drive sheave 15.

[0031] The braking device 16 keeps the drive sheave 15 stationary. During the normal operation of the elevator, the braking device 16 is not used to decelerate the car 1. The normal operation is the operation for transporting the users of the elevator to the destination floor. The deceleration of the car 1 is performed by the motor 10. The braking device 16 generates a force for keeping the drive sheave 15 stationary when the car 1 stops.

[0032] The braking device 16 includes a brake disc 17 and brake shoes 18. The brake disc 17 is arranged on the shaft 11. The brake disc 17 can also be arranged on the drive sheave 15. The brake disc 17 rotates together with the shaft 11. The brake disc 17 is an example of a braking member that rotates together with the shaft 11.

[0033] The brake shoe 18 faces the brake disc 17. The brake shoe 18 is arranged to be movable in a manner of contacting and separating from the brake disc 17. By pressing the brake shoe 18 against the brake disc 17, a resistance to the drive sheave 15, that is, a force for keeping the drive sheave 15 stationary, is generated.

[0034] If damage growth occurs in the bearing 12, it will lead to the breakage of the bearing 12. If the bearing 12 breaks, not only the bearing 12 but also other equipment included in the traction machine 5 may sometimes be damaged. Therefore, it is preferable to detect the damage generated in the bearing 12 at an early stage.

[0035] If damage occurs in the bearing 12, a specific vibration component corresponding to the damage becomes larger. Therefore, the damage generated in the bearing 12 can be detected based on the vibration generated when the shaft 11 rotates. However, if only the vibration generated when the shaft 11 rotates is detected, it is difficult to separate this vibration component from the noise during the period when the damage generated in the bearing 12 is small. Therefore, in the example shown in this embodiment, the vibration component corresponding to the damage generated in the bearing 12 is temporarily amplified to achieve early detection of this damage. Hereinafter, this vibration component will also be referred to as a specific vibration component.

[0036] Figure 3 It is a flowchart showing an example of the inspection method of the bearing 12 in Embodiment 1. Figure 4 It is a diagram for explaining the inspection method of the bearing 12.

[0037] First, the maintenance personnel of the elevator perform the installation process of installing the sensor 20 in S101. The sensor 20 has a function of detecting vibration. As an example, the sensor 20 is an acceleration sensor. In the installation process, the sensor 20 is installed on the component that vibrates due to the rotation of the shaft 11. Figure 4 It shows an example where the sensor 20 is installed on the bearing housing 13. The sensor 20 can also be installed on the bearing housing 13 by a magnet.

[0038] Next, the maintenance personnel perform a preparation process for temporarily amplifying only the specific vibration component during inspection in S102. The preparation process can also be performed before the installation process. The details of the preparation process will be described later.

[0039] Next, the maintenance personnel perform a detection process for detecting the damage generated in the bearing 12 in S103. The detection process is performed after both the installation process and the preparation process. That is, the detection process is implemented in a state where the sensor 20 is installed on the bearing housing 13 and a treatment for amplifying the specific vibration component is performed.

[0040] In the inspection process, the shaft 11 is driven by the motor 10. And while rotating the shaft 11, vibration is detected by the sensor 20. The detection of vibration by the sensor 20 is preferably carried out during one reciprocation of the car 1 between the lowest floor station and the highest floor station.

[0041] The vibration information detected by the sensor 20 is sent to the terminal 19 held by the maintenance staff. In the terminal 19, the information received from the sensor 20 is subjected to parsing processing. This parsing processing may also include envelope processing or FFT (Fast Fourier Transform) processing. This parsing processing may also include other processing. By comparing the value related to the specific vibration component obtained from this parsing processing with a reference value, it is determined whether the bearing 12 is damaged. In addition, the terminal 19 may not have the above parsing processing function and determination processing function, but have a function of displaying the information received from the sensor 20 on a display. The terminal 19 may not have the above display function, but have a function of storing the information received from the sensor 20.

[0042] Next, a specific example of the preparation process will be described. Figure 3 A preferred example showing that the preparation process includes four processes: a loading process, a braking process, a setting process, and an anti-lubrication process is presented. The preparation process may include at least one of the loading process, the braking process, the setting process, and the anti-lubrication process. For example, the preparation process may only include the loading process. The preparation process may only include the loading process and the braking process. As described above, the inspection process is carried out after the preparation process. When the preparation process includes the loading process and the braking process, the inspection process is carried out after the loading process and the braking process.

[0043] 1) Loading process

[0044] The loading process is a process for applying a load to the shaft 11 from a direction perpendicular to the shaft 11. The inspection of the bearing 12 is carried out in a state where no one is riding in the car 1, that is, in a no-load state. In the loading process, with the state where no one is riding in the car 1 as a reference, a load is applied to the shaft 11. Figure 4 An example showing the use of a pressurizing device 21 to apply a load to the shaft 11 in the loading process is presented.

[0045] When the preparation process includes the loading process, in the inspection process, while the load generated by the pressurizing device 21 is applied to the shaft 11, the shaft 11 rotates. Then, in this state, vibration is detected by the sensor 20. Since the preparation process includes the loading process, the load acting on the shaft 11 can be forcibly changed. Thereby, it is possible to temporarily amplify only the vibration component corresponding to the damage of the bearing 12 during inspection.

[0046] Figure 5This is a diagram showing an example of the pressurizing device 21. The pressurizing device 21 includes a pressurizing section 22 and a jack section 23. The pressurizing section 22 includes a roller 24, a shaft 25, a support table 26, a guide 27, and a spring 28. The roller 24 is rotatably supported by the support table 26 via the shaft 25. The support table 26 is supported by the guide 27 so as to be movable in the A direction relative to the guide 27. The A direction is a specific direction perpendicular to the shaft 25. The spring 28 is provided between the support table 26 and the guide 27. The spring 28 presses the support table 26 in the A direction relative to the guide 27.

[0047] The roller 24 is pressed against the outer peripheral surface of the drive pulley 15. In the example shown in the present embodiment, the shaft 11 is horizontally arranged. The pressurizing section 22 is arranged such that the shaft 25 is parallel to the shaft 11. By pressing the roller 24 against the drive pulley 15, a load is applied to the shaft 11. The drive pulley 15 is an example of a component that rotates together with the shaft 11. The roller 24 may also be pressed against a component other than the drive pulley 15. The roller 24 may also be directly pressed against the shaft 11.

[0048] The load applied by the pressurizing device 21 to the shaft 11 can be adjusted by the jack section 23. The jack section 23 includes a handle 29, a jack mechanism 30, and a pressing section 31. Figure 5 This shows an example in which the pressing section 31 is displaced by operating the handle 29 using the jack mechanism 30. The jack section 23 is arranged such that the direction in which the pressing section 31 is displaced is the same as the A direction.

[0049] Figure 6 This is a diagram showing an example of the load acting on the bearing 12. Figure 6 The vertical axis shown represents the load acting on the bearing 12. Figure 6 The horizontal axis shown represents the amount of press-in of the pressing section 31. In Figure 4 the example shown, the roller 24 is pressed against the drive pulley 15 from below. When the pressing section 31 is displaced upward, that is, when the amount of press-in becomes larger, in this state, the roller 24 is strongly pressed against the drive pulley 15. As a result, the load acting on the bearing 12 becomes smaller as shown in Figure 6 the figure.

[0050] Maintenance personnel can also change the load acting on the bearing 12 to a plurality of values and detect vibration each time when inspecting the bearing 12. For example, in the first application process, the maintenance personnel press the roller 24 against the drive pulley 15 from below and set the amount of press-in of the pressing section 31 to P1. As a result, a first load is applied to the shaft 11 from the pressurizing device 21. In addition, a load L1 acts on the bearing 12. The maintenance personnel perform the detection process in a state where the first load is applied to the shaft 11.

[0051] Next, during the second application process, the maintenance staff maintains the state where the roller 24 is pressed against the drive sheave 15 from below, and sets the press-in amount of the pressing portion 31 to P2. Thereby, a second load is applied to the shaft 11 from the pressing device 21. In addition, a load L2 acts on the bearing 12. The second load is greater than the first load. The maintenance staff performs the inspection process while the second load is applied to the shaft 11.

[0052] Figure 6 An example showing the subsequent third application process and fourth application process is presented. In the third application process, the press-in amount is set to P3, and a third load is applied to the shaft 11 from the pressing device 21. The third load is greater than the second load. In the fourth application process, the press-in amount is set to P4, and a fourth load is applied to the shaft 11 from the pressing device 21. The fourth load is greater than the third load. The inspection process is performed after the third application process and after the fourth application process.

[0053] Figure 7 It is a diagram for explaining another example of the application process. Figure 7 An example showing the roller 24 being pressed against the drive sheave 15 from above is presented. In Figure 7 the example shown, the pressing portion 22 is also arranged such that the shaft 25 is parallel to the shaft 11. During the inspection process, while a load is applied to the shaft 11 by the pressing device 21, the shaft 11 rotates. Then, vibration is detected by the sensor 20 in this state.

[0054] Figure 8 It is a diagram showing another example of the load acting on the bearing 12. When the pressing portion 31 is displaced downward, that is, the press-in amount becomes larger, while the roller 24 is pressed against the drive sheave 15 from above, the roller 24 is strongly pressed against the drive sheave 15. Thereby, the load acting on the bearing 12 becomes larger as Figure 8 shown.

[0055] The maintenance staff can also change the load acting on the bearing 12 to multiple values and perform vibration detection each time when inspecting the bearing 12. For example, during the first application process, the maintenance staff presses the roller 24 against the drive sheave 15 from above and sets the press-in amount of the pressing portion 31 to P1. Thereby, a first load is applied to the shaft 11 from the pressing device 21. In addition, a load L5 acts on the bearing 12. The maintenance staff performs the inspection process while the first load is applied to the shaft 11.

[0056] Next, during the second application process, the maintenance personnel maintain the state where the roller 24 is pressed against the drive sheave 15 from above, and set the press-in amount of the pressing portion 31 to P2. Thereby, a second load is applied to the shaft 11 from the pressing device 21. In addition, a load L6 acts on the bearing 12. As described above, the second load is greater than the first load. The maintenance personnel perform the detection process while the second load is applied to the shaft 11.

[0057] Figure 8 An example of performing the third application process and the fourth application process afterwards is shown. In the third application process, the press-in amount is set to P3, and a third load is applied to the shaft 11 from the pressing device 21. In the fourth application process, the press-in amount is set to P4, and a fourth load is applied to the shaft 11 from the pressing device 21. The detection process is performed after the third application process and after the fourth application process.

[0058] As another example, the maintenance personnel can also change the direction of the pressing roller 24 when inspecting the bearing 12 and perform vibration detection each time. For example, in the first application process, the maintenance personnel press the roller 24 against the drive sheave 15 from below. Then, the maintenance personnel perform the detection process while the roller 24 is pressed against the drive sheave 15 from below.

[0059] Next, in the second application process, the maintenance personnel press the roller 24 against the drive sheave 15 from above. Then, the maintenance personnel perform the detection process while the roller 24 is pressed against the drive sheave 15 from above. The maintenance personnel can also press the roller 24 against the drive sheave 15 from above in the first application process and press the roller 24 against the drive sheave 15 from below in the second application process. The maintenance personnel can also change the load acting on the bearing 12 to multiple values each time when pressing the roller 24 against the drive sheave 15 and perform vibration detection each time. The maintenance personnel can also change the load acting on the bearing 12 to multiple values each time when pressing the roller 24 against the drive sheave 15 from above and perform vibration detection each time.

[0060] 2) Braking process

[0061] The braking process is a process for increasing the load torque acting on the shaft 11. In the braking process, the brake shoe 32 is pressed against the brake disc 17. When the preparation process includes the braking process, in the detection process, the shaft 11 rotates while the brake shoe 32 is pressed against the brake disc 17. Then, vibration is detected by the sensor 20 in this state. Since the preparation process includes the braking process, the load torque acting on the shaft 11 can be forcibly changed. Thereby, it is possible to temporarily amplify only the vibration component corresponding to the damage generated in the bearing 12 only during inspection.

[0062] In the braking process, even if the brake shoe 18 is pressed against the brake disc 17, the load torque acting on the shaft 11 can be increased. However, as described above, the braking device 16 is a device for keeping the drive sheave 15 stationary. Therefore, if the shaft 11 rotates while the brake shoe 18 is pressed against the brake disc 17, there is a possibility that the brake disc 17 may be damaged due to frictional heat. Therefore, in the case where the preparation process includes the braking process, it is preferable to press a brake shoe 32 having a coefficient of friction smaller than that of the brake shoe 18 against the brake disc 17.

[0063] During the normal operation of the elevator, the brake shoe 18 faces the brake disc 17. Therefore, before performing the braking process, the maintenance personnel perform a first replacement process of replacing the brake shoe 18 with the brake shoe 32. As a result, the brake shoe 18 is removed from the braking device 16, and the brake shoe 32 is arranged to face the brake disc 17. In the braking process, the brake shoe 32 is pressed against the brake disc 17. The detection process is performed after the braking process.

[0064] After the maintenance personnel perform the detection process, before starting the normal operation of the elevator, they perform a second replacement process of replacing the brake shoe 32 with the brake shoe 18. As a result, the brake shoe 32 is removed from the braking device 16, and the brake shoe 18 is arranged to face the brake disc 17. During the normal operation of the elevator, the brake shoe 18 is pressed against the brake disc 17 to ensure the necessary static holding force.

[0065] 3) Setting process

[0066] The setting process is a process for increasing the rotational speed of the shaft 11. During the normal operation of the elevator, the rotational speed of the shaft 11 does not exceed the rated speed. In the setting process, the rotational speed of the shaft 11 is set to be greater than the rated speed. As an example, in the setting process, the rotational speed of the shaft 11 is set to a first speed. The first speed is a speed greater than the rated speed. In addition, in the elevator device, when the rotational speed of the shaft 11 is greater than a second speed, the safety device operates. The first speed is preferably a speed less than the second speed.

[0067] In the case where the preparation process includes the setting process, in the detection process performed after the setting process, the shaft 11 rotates at the first speed. Then, the vibration is detected by the sensor 20 while the shaft 11 rotates at the first speed. Since the preparation process includes the setting process, the rotational speed of the shaft 11 can be forcibly changed. As a result, it is possible to temporarily amplify only the vibration component corresponding to the damage generated in the bearing 12 only during the inspection.

[0068] 4) Anti-lubrication process

[0069] The anti-lubrication process is a process for deteriorating the lubrication performance of the bearing 12. The traction machine 5 contains lubricating oil for the bearing 12. In the anti-lubrication process, the lubricating oil for the bearing 12 is removed by opening the valve, and a degreasing agent is injected into the bearing 12 from the oil injection nozzle.

[0070] In the case where the preparation process includes the anti-lubrication process, in the inspection process performed after the anti-lubrication process, with the lubricating oil removed and the degreasing agent injected, the shaft 11 rotates. Then, vibration is detected by the sensor 20 in this state. Since the preparation process includes the anti-lubrication process, the lubrication performance of the bearing 12 can be forced to deteriorate. Thus, it is possible to temporarily amplify only during inspection the vibration component corresponding to the damage generated in the bearing 12.

[0071] In addition, in the case where the preparation process includes the anti-lubrication process, after the maintenance personnel perform the inspection process, a filling process of filling the lubricating oil for the bearing 12 into the traction machine 5 is performed before starting the normal operation of the elevator. Thus, during the normal operation of the elevator, smooth rotation of the shaft 11 is ensured.

[0072] In the example shown in the present embodiment, before performing the inspection process, a preparation process for temporarily amplifying only a specific vibration component during inspection is performed. Therefore, even when the damage existing in the bearing 12 is small, the presence of the damage can be detected with high accuracy.

[0073] In the present embodiment, a method for inspecting the bearing 12 provided in the traction machine 5 of the elevator device has been described. This is an example. When inspecting the bearings provided in other devices of the elevator device, the above method can also be adopted. In addition, when inspecting the bearings provided in devices other than the elevator device, the above method can also be adopted.

[0074] Industrial applicability

[0075] The inspection method of the present disclosure can be used to inspect the bearings that support the shaft.

[0076] Reference numeral description

[0077] 1: Car, 2: Counterweight, 3: Hoistway, 4: Rope, 5: Traction machine, 6: Control device, 7: Machine room, 10: Motor, 11: Shaft, 12: Bearing, 13: Bearing housing, 14: Machine base, 15: Driving sheave, 16: Braking device, 17: Brake disc, 18: Brake shoe, 19: Terminal, 20: Sensor, 21: Pressing device, 22: Pressing part, 23: Jack top part, 24: Roller, 25: Shaft, 26: Support table, 27: Guide, 28: Spring, 29: Handle, 30: Jack mechanism, 31: Pressing part, 32: Brake shoe.

Claims

1. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: A first loading process of pressing a roller against one of the shaft and the component rotating with the shaft, thereby applying a first load to the shaft; An installation process of installing a sensor on the component that vibrates due to the rotation of the shaft; A detection process of detecting vibration through the sensor while rotating the shaft after the installation process; A braking process of pressing a first shoe against the braking component rotating with the shaft; A first replacement process of replacing the second shoe facing the braking component with the first shoe; and A second replacement process of replacing the first shoe facing the braking component with the second shoe, The first replacement process is carried out before the braking process, The second replacement process is carried out after the detection process, The detection process is carried out after the first loading process and the braking process, In the first loading process, the roller is pressed against the one from below.

2. The method for inspecting a bearing according to claim 1, wherein, The inspection method for this bearing further includes a second loading process, in which the roller is pressed against the one from below to apply a second load different from the first load to the shaft, The detection process is carried out after the first loading process, the second loading process, and the braking process.

3. The method for inspecting a bearing according to claim 1, wherein, The inspection method for this bearing further includes a setting process, in which the rotational speed of the shaft is set to be greater than the rated speed, The detection process is carried out after the first loading process, the braking process, and the setting process.

4. The method for inspecting a bearing according to claim 1, wherein, The inspection method for this bearing further includes an anti-lubrication process, in which the lubricating oil for the bearing is removed and a degreasing agent is injected into the bearing, The detection process is carried out after the first loading process, the braking process, and the anti-lubrication process.

5. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: A first loading process of pressing a roller against one of the shaft and the component rotating with the shaft, thereby applying a first load to the shaft; An installation process of installing a sensor on the component that vibrates due to the rotation of the shaft; A detection process of detecting vibration through the sensor while rotating the shaft after the installation process; A braking process of pressing a first shoe against the braking component rotating with the shaft; A first replacement process of replacing the second shoe facing the braking component with the first shoe; and A second replacement process of replacing the first shoe facing the braking component with the second shoe, The first replacement process is carried out before the braking process, The second replacement process is carried out after the detection process, The detection process is carried out after the first loading process and the braking process.

6. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: A first loading process of pressing a roller against one of the shaft and the component rotating with the shaft, thereby applying a first load to the shaft; A braking process of pressing a first shoe against the braking component rotating with the shaft; Installation process: Install the sensor on the component that vibrates due to the rotation of the shaft; Detection process: After the installation process, detect vibration through the sensor while rotating the shaft; Anti-lubrication process: Remove the lubricating oil for the bearing and inject a degreasing agent into the bearing; First replacement process: Replace the second shoe facing the braking component with the first shoe; and Second replacement process: Replace the first shoe facing the braking component with the second shoe, The first replacement process is carried out before the braking process, The second replacement process is carried out after the detection process, The detection process is carried out after the first application process, the braking process, and the anti-lubrication process.

7. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: Braking process: Press the first shoe against the braking component that rotates with the shaft; Installation process: Install the sensor on the component that vibrates due to the rotation of the shaft; Detection process: After the installation process, detect vibration through the sensor while rotating the shaft; First replacement process: Replace the second shoe facing the braking component with the first shoe; and Second replacement process: Replace the first shoe facing the braking component with the second shoe, The first replacement process is carried out before the braking process, The second replacement process is carried out after the detection process, The detection process is carried out after the braking process.

8. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: Braking process: Press the first shoe against the braking component that rotates with the shaft; Anti-lubrication process: Remove the lubricating oil for the bearing and inject a degreasing agent into the bearing; Installation process: Install the sensor on the component that vibrates due to the rotation of the shaft; Detection process: After the installation process, detect vibration through the sensor while rotating the shaft; First replacement process: Replace the second shoe facing the braking component with the first shoe; and Second replacement process: Replace the first shoe facing the braking component with the second shoe, The first replacement process is carried out before the braking process, The second replacement process is carried out after the detection process, The detection process is carried out after the braking process and the anti-lubrication process.

9. The method for inspecting a bearing according to any one of claims 1 to 8, wherein, A drive sheave is provided on the shaft, A rope for suspending the elevator car is wound around the drive sheave.

10. A method for inspecting a bearing for supporting a shaft, wherein, The inspection method for this bearing includes: Braking process: Press the first shoe against the braking component that rotates with the shaft; Setting process: Set the rotation speed of the shaft to be greater than the rated speed; Installation process: Install the sensor on the component that vibrates due to the rotation of the shaft; Detection process: After the installation process, detect vibration through the sensor while rotating the shaft; First replacement process: Replace the second shoe facing the braking component with the first shoe; and Second replacement process: Replace the first shoe facing the braking component with the second shoe, A drive sheave is provided on the shaft, A rope for suspending the car of the elevator is wound around the driving sheave. The first replacement process is carried out before the braking process. The second replacement process is carried out after the detection process. The detection process is carried out after the braking process and the setting process.

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