A wind turbine pitch bearing cage testing machine and its use method

Abstract

The present application discloses a wind turbine pitch bearing retainer testing machine and a method for use thereof. The wind turbine pitch bearing retainer testing machine comprises: a main body, a transmission mechanism, a telescopic mechanism, and / or an angle adjustment mechanism. The main body comprises a frame, an inner ring retainer for securing the inner ring of the bearing, and an outer ring retainer for securing the outer ring of the bearing, with the pitch bearing mounted between the inner ring retainer and the outer ring retainer. The transmission mechanism is located on the frame and connected to the inner ring retainer, capable of driving the inner ring retainer to swing back and forth along the rotational direction of the pitch bearing. The telescopic mechanism is located on the frame and connected to the inner ring retainer, capable of causing the inner ring retainer to telescope toward the outer ring retainer along the radial direction of the bearing. The angle adjustment mechanism is used to adjust the tilt angle of the outer ring retainer. The wind turbine pitch bearing retainer testing machine disclosed in the present application is rich in functions and can simulate various extreme operating conditions. It has a simple and reliable structure and produces realistic and reliable simulation results.

Description

Technical Field

[0001] The present invention relates to the technical field of testing machines, and in particular to a wind turbine pitch bearing cage testing machine and a use method thereof. Background Art

[0002] Bearings are a critical component in mechanical equipment. Their primary function is to support rotating bodies, reduce friction during movement, and ensure rotational accuracy. The loads and operating conditions of pitch bearings are unfavorable to rolling bearings. Bearings are exposed to high loads and small reciprocating motion vibrations created by the pitch system or from wind profiles. The minute reciprocating motion between the rolling elements and the cage can lead to wear phenomena such as false indentations and fretting corrosion. Therefore, actual damage to pitch bearings is primarily caused by cage wear. Friction and wear testing of pitch bearing cages is crucial to determining the service life of pitch bearings in mechanical equipment.

[0003] However, the prior art lacks a testing machine and a testing method for the pitch bearing cage under extreme operating conditions. Summary of the Invention

[0004] To address the technical problem of the lack of a testing machine and testing methods for pitch bearing retainers under extreme operating conditions in the prior art, the first purpose of this application is to propose a wind turbine pitch bearing retainer testing machine that can simulate the various extreme conditions encountered by pitch bearings in actual applications, detect the wear of pitch bearing retainers under various operating conditions, and provide data reference for future actual use. The wind turbine pitch bearing retainer testing machine in this application is rich in functions, can simulate actual operating conditions, has a simple and reliable structure, and produces accurate and reliable simulation results.

[0005] The present application also proposes a method for using a wind turbine pitch bearing cage testing machine.

[0006] The wind turbine pitch bearing cage testing machine of the present application adopts the following technical solution:

[0007] A wind turbine pitch bearing cage testing machine, comprising: a main body and a transmission mechanism, a telescopic mechanism and / or an angle adjustment mechanism, wherein:

[0008] The main body includes a frame, an inner ring fixer for fixing the inner ring of the bearing, and an outer ring fixer for fixing the outer ring of the bearing, and the pitch bearing is installed between the inner ring fixer and the outer ring fixer; the transmission mechanism is located on the frame; the transmission mechanism is connected to the inner ring fixer, and the transmission mechanism can drive the inner ring fixer to swing back and forth along the rotation direction of the pitch bearing; the telescopic mechanism is located on the frame; the telescopic mechanism is connected to the inner ring fixer, and the telescopic mechanism enables the inner ring fixer to extend and retract toward the outer ring fixer along the radial direction of the bearing; the angle adjustment mechanism is used to adjust the inclination angle of the outer ring fixer.

[0009] The above structure enables the following: the inner ring of the pitch bearing is fixed to the inner ring holder, the outer ring of the pitch bearing is fixed to the outer ring holder, and a steel ball and retainer are installed between the inner and outer rings of the pitch bearing. The transmission mechanism can drive the inner ring holder to swing back and forth along the rotation direction of the pitch bearing, simulating the repeated friction on the retainer under actual operating conditions, thereby conducting friction experiments. The telescopic mechanism can cause the inner ring holder to extend and retract along the radial direction of the bearing toward the outer ring holder. On the one hand, the telescopic mechanism can move the inner ring holder closer to the outer ring holder, applying pressure on the inner ring holder, and thus the retainer. Adjusting the extension and retraction of the telescopic mechanism can adjust the pressure, thereby simulating extreme operating conditions of the retainer. On the other hand, the telescopic mechanism can also drive the inner ring holder away from the outer ring holder, facilitating the installation of the pitch bearing inner ring on the inner ring holder and providing space for installing the steel ball and retainer between the inner and outer rings of the pitch bearing. The angle adjustment mechanism can adjust the inclination angle of the outer ring retainer, making the angle between the inner ring and the outer ring of the pitch bearing adjustable, thereby simulating the extreme operating conditions of the retainer.

[0010] In this way, the wind turbine pitch bearing cage testing machine in this application can simulate the various extreme conditions encountered by pitch bearings in actual applications, detect the wear of pitch bearing cages under various operating conditions, and provide data reference for future actual use. The wind turbine pitch bearing cage testing machine in this application is rich in functions, can simulate actual working conditions, has a simple and reliable structure, and produces accurate and reliable simulation results.

[0011] As an optional implementation of a wind turbine pitch bearing retainer testing machine, the inner ring holder and / or the outer ring holder are arc-shaped. On the one hand, wind turbine pitch bearings are generally large in size. By setting the inner ring holder and / or the outer ring holder in an arc shape, the wind turbine pitch bearing structure can be divided, and only part of the wind turbine pitch bearing is used. This can reduce the size of the wind turbine pitch bearing retainer testing machine, not only facilitating experiments but also saving experimental space. On the other hand, by setting the inner ring holder and / or the outer ring holder in an arc shape, the wind turbine pitch bearing structure can be divided, and only part of the wind turbine pitch bearing is used each time. In this way, a complete wind turbine pitch bearing can be tested multiple times, saving experimental costs, controlling variables, reducing experimental errors caused by using different wind turbine pitch bearings for experiments, and improving the accuracy of experimental results.

[0012] As an optional implementation of a wind turbine pitch bearing retainer testing machine, the arc angle of the inner ring retainer is smaller than that of the outer ring retainer. This allows the inner ring retainer to constantly rub against the outer ring retainer during its reciprocating swing, resulting in continuous retainer friction and reduced idle travel of the inner ring retainer, improving testing efficiency.

[0013] As an optional implementation of a wind turbine pitch bearing retainer testing machine, the transmission mechanism includes a rotating shaft, a cam, a connecting rod, a slider, and a guide rail. The rotating shaft is connected to the cam to drive the cam's eccentric rotation. The connecting rod is connected to the cam via a rotating bearing, and the connecting rod is connected to the slider via a rotating bearing. The slider is connected to the inner ring retainer. The guide rail is located on the frame and is an arc-shaped guide rail. In this way, the transmission mechanism uses the cam's eccentric swinging structure to convert the rotating shaft's full rotation into reciprocating swinging, allowing the inner ring retainer to swing back and forth along the arc-shaped guide rail, resulting in a simple and reliable structure.

[0014] As an optional implementation of a wind turbine pitch bearing retainer testing machine, the telescopic mechanism includes a telescopic cylinder connected to the frame via a rotating bearing, and its piston rod is connected to the inner ring retainer. This allows the inner ring retainer to move closer to and further from the outer ring retainer, allowing for varying pressures to be applied to the retainer, providing easy adjustment and a reliable structure.

[0015] As an optional implementation of a wind turbine pitch bearing retainer testing machine, the frame also includes a support plate. One end of the support plate is provided with a connecting shaft connected to the frame via a rotating bearing. The other end of the support plate is provided with a retractable connecting rod connected to the inner ring retainer. The other end of the support plate is also connected to the telescopic cylinder. In this way, the load of the inner ring retainer is primarily borne by the support plate, the connecting shaft, and the retractable connecting rod, reducing the load on the telescopic cylinder and extending its service life.

[0016] As an optional implementation of a wind turbine pitch bearing cage testing machine, the angle adjustment mechanism includes a telescopic member connected to the frame at one end and to one side of the outer ring retainer at the other end. The telescopic member is capable of extending and retracting radially along the outer ring retainer. As the telescopic member extends and retracts, the height of one side of the outer ring retainer changes, thereby tilting the outer ring retainer. Adjusting the telescopic member's extension length adjusts the outer ring retainer's tilt angle, resulting in a simple and reliable structure.

[0017] A method for using any of the above-mentioned wind turbine pitch bearing cage testing machines in the present application comprises the following steps:

[0018] S1. The axial direction of the inner ring holder is parallel to the horizontal plane; a selected area on the selected pitch bearing cage is selected, and the thickness of the selected area and / or the thickness of the plasticized layer is measured;

[0019] S2. Keep the outer ring holder stationary, evenly apply grease to the inner ring, outer ring, steel balls, and retainer of the pitch bearing, and install the pitch bearing between the inner ring holder and the outer ring holder. When a wind turbine pitch bearing retainer testing machine includes the angle adjustment mechanism, adjust the length of the telescopic member to adjust the axial tilt angle of the outer ring holder; the axial tilt angle of the outer ring holder is adjustable within a range of 0-90°.

[0020] S3. Maintaining the outer ring retainer stationary, actuating the transmission mechanism so that the transmission mechanism drives the inner ring retainer to swing back and forth; when a wind turbine pitch bearing retainer testing machine includes the telescopic mechanism, simultaneously actuating the telescopic mechanism so that the telescopic mechanism drives the inner ring retainer to extend toward the outer ring retainer in the radial direction of the bearing to apply pressure;

[0021] S4. After the experiment is completed, measure the thickness of the selected area and / or the thickness of the plasticized layer, and compare the wear degree with the data measured in S1.

[0022] As an optional implementation of a method for using a wind turbine pitch bearing cage testing machine, the inner ring holder and / or the outer ring holder are arc-shaped;

[0023] The S1 also includes: making the two ends of the outer ring holder at the same horizontal height; cutting the outer ring of the variable pitch bearing at an angle corresponding to the outer ring holder and / or cutting the outer ring of the variable pitch bearing at an angle corresponding to the inner ring holder, and cutting the retainer of the variable pitch bearing at an angle corresponding to the inner ring holder, while retaining the most complete pockets and avoiding the weld section.

[0024] As an optional implementation method of using a wind turbine pitch bearing retainer testing machine, S3 also includes: the angular velocity of the inner ring holder is 5° / S, and the reciprocating swing angle range of the inner ring holder is 25°±3° with the lowest point of the outer ring holder as the center. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of an illustrative embodiment of a wind turbine pitch bearing cage testing machine in the present application;

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of an illustrative embodiment of a wind turbine pitch bearing cage testing machine in the present application;

[0028] Figure 3 This is a structural diagram of a transmission mechanism in an illustrative embodiment of a wind turbine pitch bearing cage testing machine in the present application.

[0029] Description of reference numerals in the figures:

[0030] 1. Main body; 11. Frame; 111. Loading plate; 112. Connecting shaft; 113. Connecting rod; 12. Inner ring holder; 13. Outer ring holder;

[0031] 2. Transmission mechanism; 21. Rotating shaft; 22. Cam; 23. Connecting rod; 24. Slider; 25. Guide rail;

[0032] 3. Telescopic mechanism;

[0033] 4. Angle adjustment mechanism; 41. Telescopic part. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] Reference Figure 1-2 The present application proposes a wind turbine pitch bearing cage testing machine, which includes: a main body 1 and a transmission mechanism 2, a telescopic mechanism 3 and / or an angle adjustment mechanism 4, wherein:

[0037] The main body 1 includes a frame 11, an inner ring holder 12 for fixing the inner ring of the bearing, and an outer ring holder 13 for fixing the outer ring of the bearing. The pitch bearing is installed between the inner ring holder 12 and the outer ring holder 13; the transmission mechanism 2 is located on the frame 11; the transmission mechanism 2 is connected to the inner ring holder 12, and the transmission mechanism 2 can drive the inner ring holder 12 to swing back and forth along the rotation direction of the pitch bearing; the telescopic mechanism 3 is located on the frame 11; the telescopic mechanism 3 is connected to the inner ring holder 12, and the telescopic mechanism 3 enables the inner ring holder 12 to telescope toward the outer ring holder 13 along the radial direction of the bearing; the angle adjustment mechanism 4 is used to adjust the inclination angle of the outer ring holder 13.

[0038] The above structure enables the following: the inner ring of the pitch bearing is fixed to the inner ring holder 12, the outer ring of the pitch bearing is fixed to the outer ring holder 13, and a steel ball and retainer are installed between the inner and outer rings of the pitch bearing. The transmission mechanism 2 can drive the inner ring holder 12 to swing back and forth along the rotation direction of the pitch bearing, simulating the repeated friction on the retainer under actual operating conditions, thereby conducting a friction experiment. The telescopic mechanism 3 can cause the inner ring holder 12 to extend and retract toward the outer ring holder 13 along the radial direction of the bearing. On the one hand, the telescopic mechanism 3 can move the inner ring holder 12 closer to the outer ring holder 13, applying pressure on the inner ring holder 12, that is, on the retainer. Adjusting the extension and retraction of the telescopic mechanism 3 can adjust the pressure, thereby simulating extreme operating conditions of the retainer. On the other hand, the telescopic mechanism 3 can also drive the inner ring holder 12 away from the outer ring holder 13, facilitating the installation of the pitch bearing inner ring on the inner ring holder 12 and providing space for the steel ball and retainer to be installed between the inner and outer rings of the pitch bearing. The angle adjustment mechanism 4 can adjust the tilt angle of the outer ring holder 13 so that the angle between the inner ring and the outer ring of the pitch bearing can be adjusted, thereby simulating the extreme use conditions of the cage.

[0039] Thus, the wind turbine pitch bearing cage testing machine in this embodiment can simulate the various extreme conditions encountered by pitch bearings in actual applications, detect the wear of the pitch bearing cage under various operating conditions, and provide data reference for future practical use. The wind turbine pitch bearing cage testing machine in this embodiment is rich in functions, can simulate actual operating conditions, has a simple and reliable structure, and produces accurate and reliable simulation results.

[0040] Reference Figure 1-2 The radial direction of the inner ring fixer 12 is the gravity direction perpendicular to the ground. In other embodiments, the radial direction of the inner ring fixer 12 may also be the horizontal direction.

[0041] In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, the inner ring retainer 12 and / or the outer ring retainer 13 are arc-shaped. On the one hand, wind turbine pitch bearings are generally large in size. By configuring the inner ring retainer 12 and / or the outer ring retainer 13 in an arc shape, the wind turbine pitch bearing structure can be segmented, and only a portion of the wind turbine pitch bearing can be used. This can reduce the size of the wind turbine pitch bearing retainer testing machine, not only facilitating experiments but also saving experimental space. On the other hand, configuring the inner ring retainer 12 and / or the outer ring retainer 13 in an arc shape can segment the wind turbine pitch bearing structure, and only a portion of the wind turbine pitch bearing can be used at a time. This allows multiple experiments to be conducted on a complete wind turbine pitch bearing, saving experimental costs, controlling variables, reducing experimental errors caused by using different wind turbine pitch bearings, and improving the accuracy of experimental results.

[0042] In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, the arc angle of the inner ring retainer 12 is smaller than that of the outer ring retainer 13. This allows the inner ring retainer 12 to constantly rub against the outer ring retainer 13 as it reciprocates, resulting in continuous retainer friction and reduced idle travel of the inner ring retainer 12, improving testing efficiency.

[0043] Reference Figure 3 In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, transmission mechanism 2 includes a rotating shaft 21, a cam 22, a connecting rod 23, a slider 24, and a guide rail 25. The rotating shaft 21 is connected to the cam 22 to drive eccentric rotation of the cam 22. The connecting rod 23 is connected to the cam 22 via a rotating bearing, and the connecting rod 23 is connected to the slider 24 via a rotating bearing. The slider 24 is connected to the inner ring retainer 12. The guide rail 25 is located on the frame 11 and is in the shape of a circular arc. Thus, the transmission mechanism 2 utilizes the eccentric swinging structure of the cam 22 to convert the full rotation of the rotating shaft 21 into reciprocating swinging motion, allowing the inner ring retainer 12 to swing back and forth along the shape of the circular arc guide rail 25. This results in a simple and reliable structure.

[0044] In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, telescopic mechanism 3 includes a telescopic cylinder connected to frame 11 via a rotary bearing. The cylinder's piston rod is connected to inner ring retainer 12. This allows the inner ring retainer 12 to move closer to and further from the outer ring retainer 13, allowing for varying pressures to be applied to the retainer, resulting in easy adjustment and a reliable structure.

[0045] In a specific embodiment, a pressure sensor is provided at the connection between the telescopic cylinder and the inner ring holder 12 , which can detect the magnitude of the radial force of the inner ring holder 12 .

[0046] In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, frame 11 also includes a support plate 111. One end of support plate 111 is provided with a connecting shaft 112, connected to frame 11 via a rotating bearing. The other end of support plate 111 is provided with a retractable connecting rod 113, which is connected to inner ring retainer 12. The other end of support plate 111 is also connected to a telescopic cylinder. Thus, the load of inner ring retainer 12 is primarily borne by support plate 111, connecting shaft 112, and retractable connecting rod 113, reducing the load on the telescopic cylinder and extending its service life.

[0047] In a preferred embodiment of a wind turbine pitch bearing retainer testing machine, the angle adjustment mechanism 4 includes a telescopic member 41, one end of which is connected to the frame 11 and the other end to one side of the outer ring retainer 13. The telescopic member 41 is capable of extending and retracting along the radial direction of the outer ring retainer 13. As the telescopic member 41 retracts and retracts, the height of one side of the outer ring retainer 13 changes, thereby tilting the outer ring retainer 13. Adjusting the extension length of the telescopic member 41 adjusts the tilt angle of the outer ring retainer 13, resulting in a simple and reliable structure. In one embodiment, the telescopic member 41 can be constructed as a bolt and nut. When the bolt rotates, the nut moves up and down along the bolt, thereby extending and retracting.

[0048] A method for using any of the above-mentioned wind turbine pitch bearing cage testing machines in the present application comprises the following steps:

[0049] S1. Align the axial direction of the inner ring retainer 12 with the horizontal plane; select a selected area on the retainer of the pitch bearing and measure the thickness and / or plasticized layer thickness of the selected area. In one embodiment, multiple values ​​can be measured for each area.

[0050] S2. Keep the outer ring holder 13 stationary, evenly apply grease to the inner ring, outer ring, steel ball and retainer of the pitch bearing, and install the pitch bearing between the inner ring holder 12 and the outer ring holder 13; when a wind turbine pitch bearing retainer testing machine includes an angle adjustment mechanism 4, adjust the length of the telescopic member 41 to adjust the axial tilt angle of the outer ring holder 13; the axial tilt angle adjustment range of the outer ring holder 13 is 0-90°. In one embodiment, the amount of grease used is sufficient to ensure the flexible operation of the pitch bearing. In one embodiment, new grease is added through the oil filling hole every 48 hours of effective working time. In one embodiment, the grease is Fuchs 585K wind power special grease.

[0051] S3. Maintain outer ring retainer 13 stationary and activate transmission mechanism 2, causing transmission mechanism 2 to drive inner ring retainer 12 to swing back and forth. If a wind turbine pitch bearing retainer testing machine includes an expansion mechanism 3, this is simultaneously activated, causing expansion mechanism 3 to extend inner ring retainer 12 radially toward outer ring retainer 13 to apply pressure. In one embodiment, the pressure applied by expansion mechanism 3 can be 5 kN, 10 kN, 15 kN, 20 kN, or the like.

[0052] S4. After the experiment is complete, measure the thickness of the selected area and / or the thickness of the plasticized layer and compare the wear degree with the data measured in S1. In one embodiment, the thickness of the plasticized layer and / or the thickness of the cage in the selected area is measured every 48 hours using a measuring tool. Three values ​​are measured for each area, and the minimum and average values ​​are recorded as test data. The color of the grease leakage is observed and photographed.

[0053] In a preferred specific embodiment of a method for using a wind turbine pitch bearing retainer testing machine, the inner ring retainer 12 and / or the outer ring retainer 13 are arc-shaped; at this time, S1 also includes: making the two ends of the outer ring retainer 13 at the same horizontal plane height; cutting the outer ring of the pitch bearing at an angle corresponding to the outer ring retainer 13 and / or cutting the outer ring of the pitch bearing at an angle corresponding to the inner ring retainer 12, cutting the retainer of the pitch bearing at an angle corresponding to the inner ring retainer 12, and retaining the most complete pockets and avoiding the weld section.

[0054] In one embodiment, cutting the outer ring of the pitch bearing at an angle corresponding to the outer ring retainer 13 and / or cutting the outer ring of the pitch bearing at an angle corresponding to the inner ring retainer 12, and cutting the retainer of the pitch bearing at an angle corresponding to the inner ring retainer 12, while retaining the most complete pockets and avoiding the weld section, specifically may include:

[0055] Cut the outer ring of the bearing into 4 pieces at 360° (divided every 90°). Cold working is preferred as the cutting method. The affected range of thermal cutting should be less than 20mm. The cross-section chamfer should be R1. Other dimensions and surface quality should be consistent with the bearing standard. Cut the inner ring of the bearing into 8 pieces at 360° (divided every 45°). Cold working is preferred as the cutting method. The affected range of thermal cutting should be less than 20mm. The cross-section chamfer should be R1. Other dimensions and surface quality should be consistent with the bearing standard. Cut the original retaining frame, with the premise of retaining the most complete pockets and avoiding the weld section, and cut it into 8 pieces at 360° (divided every 45°). Cold working should be symmetrical and the cross-section edge chamfer should be R1. For the plastic-dipped retaining frame, the standard is that the plasticized layer has good adhesion within the cross-section range of 20mm, and there are no burrs, bubbles, or peeling. The other dimensions and surface quality of the cut retaining frame are consistent with the original retaining frame standard. During installation, lift the inner ring, place the cage between the inner and outer rings of the pitch bearing, and place the rolling elements. The number of rolling elements should be ≥ 6, and the appearance and size of the rolling elements should be consistent with the standards of the rolling elements in the original bearing.

[0056] In a preferred specific embodiment of a method for using a wind turbine pitch bearing retainer testing machine, S3 also includes: the angular velocity of the inner ring holder 12 is 5° / S, and with the lowest point of the outer ring holder 13 as the center, the reciprocating swing angle range of the inner ring holder 12 is 25°±3°.

[0057] Those skilled in the art should understand that the above specific numerical values ​​are provided as examples for a better understanding of the present application and shall not unduly limit the scope of protection of the present application.

[0058] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0059] The above are merely embodiments of the present invention and are not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A wind turbine pitch bearing cage testing machine, characterized in that: include: A main body, the main body comprising a frame, an inner ring holder for fixing the inner ring of the bearing, and an outer ring holder for fixing the outer ring of the bearing, the pitch bearing being mounted between the inner ring holder and the outer ring holder; a transmission mechanism, the transmission mechanism being located on the frame; the transmission mechanism being connected to the inner ring holder, the transmission mechanism being capable of driving the inner ring holder to swing back and forth along the rotation direction of the pitch bearing; the transmission mechanism comprising a rotating shaft, a cam, a connecting rod, a slider, and a guide rail; the rotating shaft being connected to the cam to drive the cam to rotate eccentrically; the connecting rod being connected to the cam via a rotating bearing; the connecting rod being connected to the slider via a rotating bearing; the slider being connected to the inner ring holder; the guide rail being located on the frame, and being an arc-shaped guide rail; a telescopic mechanism located on the frame; the telescopic mechanism is connected to the inner ring holder, the telescopic mechanism causes the inner ring holder to telescope toward the outer ring holder along the radial direction of the bearing; and / or an angle adjustment mechanism for adjusting the inclination angle of the outer ring holder.

2. A wind turbine pitch bearing cage testing machine according to claim 1, characterized in that: The inner ring fixer and / or the outer ring fixer are arc-shaped.

3. A wind turbine pitch bearing cage testing machine according to claim 2, characterized in that: The arc angle of the inner ring fixer is smaller than the arc angle of the outer ring fixer.

4. A wind turbine pitch bearing cage testing machine according to claim 1, characterized in that: The telescopic mechanism includes a telescopic oil cylinder, the telescopic oil cylinder is connected to the frame through a rotary bearing, and the piston rod of the telescopic oil cylinder is connected to the inner ring fixer.

5. A wind turbine pitch bearing cage testing machine according to claim 4, characterized in that: The frame also includes a supporting plate, one end of which is provided with a connecting shaft connected to the frame via a rotating bearing, the other end of which is provided with a retractable connecting rod connected to the inner ring fixer, and the other end of the supporting plate is connected to the telescopic oil cylinder.

6. A wind turbine pitch bearing cage testing machine according to claim 1, characterized in that: The angle adjustment mechanism includes a telescopic member, one end of which is connected to the frame, and the other end is connected to one side of the outer ring fixer. The telescopic member can be telescoped along the radial direction of the outer ring fixer.

7. A method for using any one of the wind turbine pitch bearing cage testing machines described in claims 1-6, characterized in that: The steps include: S1. The axial direction of the inner ring holder is parallel to the horizontal plane; a selected area on the selected pitch bearing cage is selected, and the thickness of the selected area and / or the thickness of the plasticized layer is measured; S2. Keep the outer ring holder stationary, evenly apply grease to the inner ring, outer ring, steel balls, and retainer of the pitch bearing, and install the pitch bearing between the inner ring holder and the outer ring holder. When a wind turbine pitch bearing retainer testing machine includes the angle adjustment mechanism, adjust the length of the telescopic member to adjust the axial tilt angle of the outer ring holder; the axial tilt angle of the outer ring holder is adjustable within a range of 0-90°. S3. Maintaining the outer ring retainer stationary, actuating the transmission mechanism so that the transmission mechanism drives the inner ring retainer to swing back and forth; when a wind turbine pitch bearing retainer testing machine includes the telescopic mechanism, simultaneously actuating the telescopic mechanism so that the telescopic mechanism drives the inner ring retainer to extend toward the outer ring retainer in the radial direction of the bearing to apply pressure; S4. After the experiment is completed, measure the thickness of the selected area and / or the thickness of the plasticized layer, and compare the wear degree with the data measured in S1.

8. The method for using a wind turbine pitch bearing cage testing machine according to claim 7, characterized in that: The inner ring fixer and / or the outer ring fixer are arc-shaped; The S1 also includes: making the two ends of the outer ring holder at the same horizontal height; cutting the outer ring of the variable pitch bearing at an angle corresponding to the outer ring holder and / or cutting the outer ring of the variable pitch bearing at an angle corresponding to the inner ring holder, and cutting the retainer of the variable pitch bearing at an angle corresponding to the inner ring holder, while retaining the most complete pockets and avoiding the weld section.

9. The method for using a wind turbine pitch bearing cage testing machine according to claim 7, characterized in that: Said S3 also includes: the angular velocity of the inner ring fixer is 5° / S, and the reciprocating swing angle range of the inner ring fixer is 25°±3° with the lowest point of the outer ring fixer as the center.

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