A reciprocating fretting test bench for wind turbine bearings

Abstract

This application relates to a reciprocating fretting test bench for wind turbine bearings, belonging to the field of wind turbine bearing testing technology. The reciprocating fretting test bench includes a frame, a support platform, a lower raceway, a limiting body, an upper raceway, a reciprocating drive mechanism, and a loading mechanism. The support platform is slidably mounted on the frame in the horizontal direction. The lower raceway is mounted on the support platform and abuts against the lower side of the roller. The limiting body is mounted on the support platform and located above the lower raceway. The limiting body has a receiving hole for placing the roller and lubricating grease. The reciprocating drive mechanism drives the support platform to slide back and forth. The reciprocating displacement of the support platform is less than 5 mm. The loading mechanism drives the upper raceway to press firmly against the roller. This application avoids size effects, ensuring test accuracy; simultaneously, it helps reduce test costs and time costs.

Description

Technical Field

[0001] This application relates to the field of wind turbine bearing testing technology, and in particular to a reciprocating micro-motion test bench for wind turbine bearings. Background Technology

[0002] To achieve greater power generation, domestic wind turbines are primarily developing in two directions: one is towards larger megawatts, leading to a shift in pitch bearings from two rows of ball bearings to three rows of column bearings; the other is a transition from a unified pitch system to an independent pitch system. While three-row column bearings offer greater load-bearing capacity than ball bearings, the lubrication characteristics between the rolling elements and raceways differ between ball and column bearings. Greases previously used for ball bearings exhibit drastically different lubrication properties on column bearings. Furthermore, independent pitch control introduces more small-angle pitch movements, causing lubrication issues related to fretting wear in the three-row column bearings.

[0003] Currently, to address the lubrication issues of fretting wear in pitch bearings, most bearing lubrication testing machines utilize standard testing machines for general-purpose bearings. However, due to the large size of pitch bearings, the size of the bearing being tested is typically selected as a fraction of the pitch bearing's size. This smaller size ratio can lead to dimensional effects that can negatively impact test accuracy. Additionally, some non-standard testing machines exist in the wind power industry for testing full-size pitch bearings. However, these machines are usually bulky, expensive, and have long installation cycles, resulting in high testing and time costs for numerous basic tests. Utility Model Content

[0004] To effectively avoid size effects and ensure test accuracy, while also helping to reduce test costs and time costs, this application provides a reciprocating micro-motion test bench for wind turbine bearings.

[0005] The technical solution adopted in this application for a reciprocating fretting test bench for wind turbine bearings is as follows: A reciprocating fretting test bench for wind turbine bearings, comprising: frame; A support platform, which is slidably mounted on the frame in a horizontal direction; The lower raceway is disposed on the support platform and is used to abut against the lower side of the roller; A limiting body is provided on the support platform and located above the lower raceway. The limiting body has a receiving hole for placing the roller and grease. The sliding direction of the support platform is perpendicular to the rolling axis of the roller. The upper raceway is located above the limiting body and is used to abut against the upper side of the roller; A reciprocating drive mechanism is used to drive the support platform to slide back and forth, and the reciprocating displacement of the support platform is less than 5mm; A loading mechanism is used to drive the upper raceway to press against the rollers.

[0006] Preferably, a limiting rod is slidably passed through the limiting body, the limiting rod extends into the receiving hole and is offset from the center of the receiving hole, and when the roller in the receiving hole abuts against the side of the limiting rod near the center of the receiving hole, the roller is located in the middle position of the receiving hole.

[0007] Preferably, a displacement sensor is provided on the frame, the displacement sensor is used to detect the displacement change of the support platform, and the displacement sensor is electrically connected to an external PLC control system to send the detected displacement change data of the support platform.

[0008] Preferably, the frame includes a base, a guide body, columns, a top cover, and a mounting base. The guide body is disposed on the base, the support platform is slidably disposed on the guide body, multiple columns are provided, each column is disposed vertically on the base, the top cover is disposed above the multiple columns, the mounting base is located on one side of the base, the reciprocating drive mechanism is disposed on the mounting base, the loading mechanism is disposed on the top cover, and the displacement sensor is disposed on the guide body.

[0009] Preferably, the guide body is a track, which is mounted on a base. Inclined retainers are provided on opposite sides of the track, and a horizontal retainer is provided on the track. Guide rollers are installed on both the inclined and horizontal retainers. A guide platform is provided on the lower side of the support platform. The width of the guide platform increases towards the track. The opposite sides of the guide platform abut against the guide rollers on the inclined retainers on both sides, and the bottom wall of the guide platform abuts against the guide rollers of the horizontal retainer.

[0010] Preferably, the guide body is provided with limiting plates on opposite sides, the arrangement direction of the two limiting plates is parallel to the sliding direction of the support platform, and the displacement sensor is provided on either limiting plate.

[0011] Preferably, the reciprocating drive mechanism includes a first drive source, a first tension / compression sensor, and a pull rod. The first drive source is mounted on a mounting base, the first tension / compression sensor is located at the output end of the first drive source, and the pull rod is mounted on the first tension / compression sensor. The first drive source is used to drive the first tension / compression sensor and the pull rod to move horizontally. The pull rod is connected to a support platform, and both the first drive source and the first tension / compression sensor are electrically connected to an external PLC control system.

[0012] Preferably, the loading mechanism includes a second drive source, a second tension / compression sensor, and a pressing platform. The second drive source is disposed on the top cover, the second tension / compression sensor is disposed at the output end of the second drive source, the pressing platform is connected to the second tension / compression sensor, and the pressing platform is slidably sleeved on multiple columns. The second drive source is used to drive the second tension / compression sensor and the pressing platform to slide in the vertical direction. The pressing platform is located above the limiting body. The upper roller is detachably connected to the pressing platform. Both the second drive source and the second tension / compression sensor are electrically connected to an external PLC control system.

[0013] Preferably, the lower pressing platform has two T-shaped connecting grooves opposite each other, and each T-shaped connecting groove has a T-shaped nut slidably disposed at both ends. A locking bolt is threaded onto the T-shaped nut. A locking hole is provided on the upper raceway. The locking hole corresponds to the locking bolt one by one. The locking bolt passes through the corresponding locking hole. The head of the locking bolt abuts against the side of the upper raceway away from the lower pressing platform. The locking bolt is misaligned with the limiting body.

[0014] Preferably, a plurality of connecting screws are provided on the support platform, and a through hole is provided on the limiting body. The through hole corresponds to a connecting screw, and the connecting screw passes through the corresponding through hole. A locking nut is threaded onto the connecting screw, and the locking nut abuts against the side of the limiting body away from the support platform.

[0015] In summary, this application includes the following beneficial technical effects: During the test, a roller coated with grease is placed into the receiving hole of the limiting body. Under the action of gravity, the roller abuts against the lower raceway below. Then, grease is filled into the receiving hole. Next, the loading mechanism drives the upper raceway to move downward to press the roller, achieving clamping of the roller between the upper and lower raceways and applying a certain pressure to the roller. Then, the reciprocating drive mechanism drives the bearing platform to reciprocate horizontally. The reciprocating displacement is less than 5mm, preferably 2mm, causing the roller to reciprocate fretting, simulating the small-angle reciprocating fretting of three rows of rollers in a wind turbine pitch bearing. This allows for the testing of the lubrication performance of the grease under the fretting condition of the roller bearing. At the same time, the lubrication strategy can be changed as needed to evaluate or reduce the impact of fretting wear on the bearing service life by testing different lubrication strategies. This application uses rollers of actual size in the pitch bearing for the test, effectively avoiding the size effect and ensuring the accuracy of the test. At the same time, since only the rollers need to be tested, the test bench is small in size and easy to operate. For multiple sets of basic tests, it helps to reduce the test cost and time cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the overall structure from another perspective of an embodiment of this application.

[0018] Figure 3 This is a first partial structural diagram of an embodiment of this application.

[0019] Figure 4 This is a second partial structural diagram of an embodiment of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Frame; 101. Base; 102. Guide body; 103. Column; 104. Top cover; 105. Mounting seat; 2. Bearing platform; 3. Lower roller; 4. Limiting body; 41. Accommodating hole; 5. Upper roller; 6. Reciprocating drive mechanism; 61. First drive source; 62. First tension / compression sensor; 63. Pull rod; 7. Loading mechanism; 71. Second drive source; 72. Second tension / compression sensor; 73. Lower pressing platform; 8. Limiting rod; 9. Displacement sensor; 10. Inclined retainer; 11. Horizontal retainer; 12. Guide platform; 13. Limiting plate; 14. T-shaped connecting groove; 15. Connecting screw. Detailed Implementation

[0021] The following combination Figures 1-4 This application will be described in further detail.

[0022] This application discloses a reciprocating fretting test bench for wind turbine bearings. (Refer to...) Figure 1 and Figure 2 The wind turbine bearing reciprocating micro-motion test bench includes a frame 1, a support platform 2, a lower raceway 3, a limiting body 4, an upper raceway 5, a reciprocating drive mechanism 6, and a loading mechanism 7. The support platform 2 is slidably mounted on the frame 1 in the horizontal direction. The lower raceway 3 is mounted on the support platform 2 and is used to abut against the lower side of the roller. The limiting body 4 is also mounted on the support platform 2 and is located above the lower raceway 3. Specifically, the limiting body 4 is a rectangular plate. The length direction of the limiting body 4 is parallel to the sliding direction of the support platform 2. The limiting body 4 has a receiving hole 41 that penetrates the limiting body 4 in the vertical direction. The length direction of the receiving hole 41 is parallel to the length direction of the limiting body 4. The receiving hole 41 is used to place the roller and grease. The sliding direction of the support platform 2 is perpendicular to the rolling axis of the roller in the receiving hole 41. The diameter of the roller is greater than the thickness of the limiting body 4, and the length of the roller is adapted to the width of the receiving hole 41.

[0023] Reference Figure 1 and Figure 2The upper raceway 5 is located above the limiting body 4 and is used to abut against the upper side of the roller. Specifically, the materials of the upper raceway 5 and the lower raceway 3 are the same as the materials of the inner and outer rings of the wind turbine pitch bearing, respectively. The surfaces of the upper raceway 5 and the lower raceway 3 that contact the roller are both smooth surfaces to simulate the small-angle reciprocating motion of three rows of rollers in the wind turbine pitch bearing. The reciprocating drive mechanism 6 is set on the frame 1 and is used to drive the bearing platform 2 to slide back and forth. The reciprocating displacement of the bearing platform 2 is less than 5mm. The loading mechanism 7 is set on the frame 1 and is used to drive the upper raceway 5 to press against the roller. Both the reciprocating drive mechanism 6 and the loading mechanism 7 are electrically connected to the external PLC control system.

[0024] During the experiment, a roller coated with grease was placed into the receiving hole 41 of the limiting body 4. Under the action of gravity, the roller abutted against the lower raceway 3 below. Then, grease was filled into the receiving hole 41. The loading mechanism 7 then drove the upper raceway 5 to move downward to press the roller, so that the upper raceway 5 and the lower raceway 3 clamped the roller and applied a certain pressure. Then, the reciprocating drive mechanism 6 drove the bearing platform 2 to reciprocate in the horizontal direction. The reciprocating displacement was less than 5 mm, preferably 2 mm, so that the roller performed reciprocating micro-movements to simulate three rows of rollers. The small-angle reciprocating motion in the wind turbine pitch bearing is used to test the lubrication performance of grease under fretting conditions of the roller bearing. The lubrication strategy can be changed as needed, and the impact of fretting wear on bearing life can be evaluated or reduced by testing different lubrication strategies. This application uses rollers of actual size in a three-row roller pitch bearing for testing, which effectively avoids size effects and ensures test accuracy. At the same time, since only rollers need to be tested, the test bench is small and easy to operate. For multiple sets of basic tests, it helps to reduce test costs and time costs.

[0025] Reference Figure 1 Furthermore, the frame 1 includes a base 101, a guide body 102, columns 103, a top cover 104, and a mounting base 105. The guide body 102 is fixedly mounted on the base 101, and the support platform 2 is slidably mounted on the guide body 102, which helps to guide the sliding of the support platform 2. Multiple columns 103 are provided, specifically, four columns 103 are provided, and the four columns 103 are fixed vertically at the four corners of the base 101. The top cover 104 is fixedly mounted above the four columns 103 and is located above the support platform 2. The loading mechanism 7 is mounted on the top cover 104. The mounting base 105 is located on one side of the base 101. Specifically, the arrangement direction of the mounting base 105 and the base 101 is parallel to the sliding direction of the support platform 2. The reciprocating drive mechanism 6 is mounted on the mounting base 105.

[0026] Reference Figure 1 and Figure 3To facilitate the reciprocating movement of the support platform 2, the reciprocating drive mechanism 6 includes a first drive source 61, a first tension / compression sensor 62, and a pull rod 63. The first drive source 61 is fixedly mounted on the mounting base 105, the first tension / compression sensor 62 is fixedly disposed at the output end of the first drive source 61, one end of the pull rod 63 is fixedly connected to the first tension / compression sensor 62, and the other end is fixedly connected to the support platform 2. The first drive source 61 is used to drive the first tension / compression sensor 62 and the pull rod 63 to move horizontally. Both the first drive source 61 and the first tension / compression sensor 62 are electrically connected to an external PLC control system. Specifically, the first drive source 61 uses a servo geared motor and a ball screw in combination, and the first tension / compression sensor 62 is connected to the moving part of the ball screw, which helps to realize the small-range reciprocating movement of the support platform 2. In other embodiments, the first drive source 61 can also be a cylinder, a hydraulic cylinder, an electric cylinder, etc.

[0027] When it is necessary to drive the bearing platform 2 to reciprocate, the servo geared motor is started by the external PLC control system. The servo geared motor drives the ball screw to rotate. The moving part on the ball screw drives the first tension and pressure sensor and the tie rod 63 to move. The tie rod 63 drives the bearing platform 2 to reciprocate within a small range. The first tension and pressure sensor 62 helps to detect the friction force of the tie rod 63 driving the bearing platform 2 to move, which is convenient for analyzing the lubrication effect of the grease under the micro-motion condition of the roller.

[0028] Reference Figure 1 and Figure 2 To facilitate pressing the upper raceway 5 against the rollers, the loading mechanism 7 includes a second drive source 71, a second tension / compression sensor 72, and a lower pressure platform 73. The second drive source 71 is fixedly mounted on the top cover 104, the second tension / compression sensor 72 is fixedly disposed at the output end of the second drive source 71, and the lower pressure platform 73 is fixedly connected to the lower surface of the second tension / compression sensor 72. The lower pressure platform 73 is slidably mounted on multiple columns 103 in the vertical direction. The second drive source 71 is used to drive the second tension / compression sensor 72 and the lower pressure platform 73 to slide in the vertical direction. Both the second drive source 71 and the second tension / compression sensor 72 are electrically connected to an external PLC control system. Specifically, the second drive source 71 is a hydraulic cylinder. In other embodiments, the second drive source 71 can also be an electric cylinder, a pneumatic cylinder, etc. The lower pressure platform 73 is located above the limiting body 4, and the upper raceway 5 is detachably connected to the lower pressure platform 73.

[0029] Before the test, the upper raceway 5 is installed on the lower surface of the lower pressure platform 73. Then, the external PLC control system starts the second drive source 71. The second drive source 71 drives the lower pressure platform 73 and the upper raceway 5 to move downward, so that the upper raceway 5 presses against the rollers in the limiting body 4 and applies a certain pressure. This helps to simulate the small-angle reciprocating motion of three rows of rollers in the wind turbine pitch bearing. The pressure of the upper raceway 5 on the rollers is detected by the second tension and compression sensor and sent to the external PLC control system, which helps to simulate the actual working conditions.

[0030] Reference Figure 2 To achieve a detachable connection between the upper raceway 5 and the lower pressing platform 73, two T-shaped connecting grooves 14 are provided on the lower surface of the lower pressing platform 73. Each T-shaped connecting groove 14 has a T-shaped nut (not shown in the figure) slidably mounted at both ends. A locking bolt is threaded onto the T-shaped nut. The upper raceway 5 has locking holes, each corresponding to a locking bolt. The locking bolt passes through the corresponding locking hole and connects to the corresponding T-shaped nut. The head of the locking bolt abuts against the side of the upper raceway 5 away from the lower pressing platform 73. The locking bolt is misaligned with the limiting body 4, minimizing interference between the upper raceway 5 and the rollers. The combination of the T-shaped nut and the locking bolt greatly facilitates the assembly and disassembly of the upper raceway 5, helping to save time and costs.

[0031] Reference Figure 3 and Figure 4 To facilitate the sliding of the support platform 2, the guide body 102 is a track, which is fixedly mounted on the base 101. The track has a U-shaped cross-section, and its length is parallel to the sliding direction of the support platform 2. Inclined retainers 10 are fixedly mounted on opposite sides of the inner wall of the track. An installation groove is provided on the bottom wall of the track, and a horizontal retainer 11 is fixedly mounted in the installation groove. Guide rollers are mounted on both the inclined retainer 10 and the horizontal retainer 11. The rotation axis of the guide rollers is perpendicular to the sliding direction of the support platform 2. A guide platform 12 is fixedly mounted on the lower side of the support platform 2. The width of the guide platform 12 increases towards the track, making the guide platform 12 dovetail-shaped. The opposite sides of the guide platform 12 abut against the guide rollers on the inclined retainers 10 on both sides, so that the guide platform 12 will not detach from the guide rollers on the inclined retainers 10 on both sides in the vertical direction. The bottom wall of the guide platform 12 abuts against the guide rollers of the horizontal retainer 11. The guide rollers on the inclined cages 10 on both sides and the guide rollers on the horizontal cage 11 help to reduce the resistance to the sliding of the bearing platform 2.

[0032] Reference Figure 3 and Figure 4To facilitate the installation of the limiting body 4 and the lower roller 3, the support platform 2 includes a platform body and an I-beam. The platform body and the I-beam are fixed sequentially from bottom to top. The guide platform 12 is fixed to the bottom wall of the platform body, and the tie rod 63 is fixedly connected to the side wall of the platform body. The lower roller 3 and the limiting body 4 are sequentially arranged above the I-beam. Multiple connecting screws 15 are fixedly inserted into the platform body of the support platform 2. Both the I-beam and the limiting body 4 have through holes, which correspond one-to-one with the connecting screws 15. The connecting screws 15 pass through the corresponding through holes, and locking nuts are threaded onto the connecting screws 15. The locking nuts abut against the side of the limiting body 4 away from the support platform 2. The support platform 2 is designed as a combination structure of the platform body and the I-beam, which facilitates the fixing of the limiting body 4. In this embodiment, the lower roller 3 is fixedly connected to the surface of the I-beam in the support platform 2 by countersunk bolts. In other embodiments, the lower roller 3 can be pressed against the I-beam by the limiting body 4. The use of bolts and connecting screws 15 facilitates the disassembly and assembly of the lower raceway 3, effectively saving testing time and costs.

[0033] Reference Figure 3 Limiting plates 13 are bolted to the opposite sides of the guide body 102. The arrangement of the two limiting plates 13 is parallel to the sliding direction of the support platform 2. The limiting plates 13 prevent the guide platform 12 from sliding off the end of the track. A displacement sensor 9 is installed on the limiting plate 13 on the side away from the mounting base 105. The displacement sensor 9 is used to detect the displacement change of the support platform 2. Specifically, the displacement sensor 9 is a photoelectric displacement sensor. The displacement sensor 9 is electrically connected to an external PLC control system to send the detected displacement change data of the support platform 2. The setting of the displacement sensor 9 helps to determine the displacement change of the support platform 2, facilitates the modulation and monitoring of the displacement of the support platform 2, and allows the motion curve to be programmed by the external PLC control system to simulate various small angle changes under actual working conditions.

[0034] Reference Figure 3 To improve test accuracy, a limiting rod 8 is slidably inserted through the limiting body 4. The sliding direction of the limiting rod 8 is perpendicular to the sliding direction of the bearing platform 2. The limiting rod 8 extends into the receiving hole 41, and the center position of the limiting rod 8 and the receiving hole 41 is offset. When the roller in the receiving hole 41 abuts against the side of the limiting rod 8 near the center of the receiving hole 41, the roller is located in the middle position of the receiving hole 41. During the test, the limiting rod 8 is inserted into the limiting body 4, and then the roller is placed into the receiving hole 41, so that the roller abuts against the side of the limiting rod 8 near the center of the receiving hole 41, thereby quickly positioning the roller and placing it in the middle position of the receiving hole 41. After the upper raceway 5 presses the roller, the limiting rod 8 is pulled out of the limiting body 4, so as not to affect the test of the roller.

[0035] The implementation principle of this application embodiment is as follows: During the test, the lower raceway 3, the limiting body 4, and the upper raceway 5 are first installed. After installation, the limiting rod 8 is inserted into the receiving hole 41. Then, the roller coated with grease is placed into the receiving hole 41 of the limiting body 4 and abuts against the side of the limiting rod 8 near the center of the receiving hole 41. The roller abuts against the lower raceway 3 under the action of gravity. Then, grease is filled into the receiving hole 41 as needed. Then, the second drive source 71 is started through the external PLC control system. The second drive source 71 drives the lower pressing platform 73 and the upper raceway 5 to move downward, so that the upper raceway 5 presses the roller in the limiting body 4, so that the upper raceway 5 and the lower raceway 3 clamp the roller. The pressure of the upper raceway 5 on the roller is detected by the second tension and compression sensor and sent to the external PLC control system, so that the upper raceway 5 applies the required pressure to the roller.

[0036] Next, the limiting rod 8 is removed from the limiting body 4, and then the servo geared motor is started through the external PLC control system. The servo geared motor drives the ball screw to rotate, and the moving part on the ball screw drives the first tension and pressure sensor 62 and the pull rod 63 to move. The pull rod 63 drives the bearing platform 2 to move back and forth within a small range. The back and forth movement is less than 5mm, preferably 2mm, so that the rollers perform reciprocating micro-motion, simulating the small-angle reciprocating motion of three rows of rollers in the wind turbine pitch bearing. The first tension and pressure sensor 62 helps to detect the friction force of the pull rod 63 driving the bearing platform 2 to move, thereby detecting the lubrication performance of the grease under the micro-motion condition of the roller bearing. If necessary, the lubrication strategy can be changed and different lubrication strategies can be tested to evaluate or reduce the impact of micro-motion wear on the bearing service life. The test bench described in this application was used to test cylindrical rollers with a diameter and length of 26 mm. The test bench operated for 16 hours under a pressure of 2500 MPa and a reciprocating displacement of 2 mm. The experimental simulation results were similar to the actual pseudo-Burlman indentations on the cylindrical rollers of the three-row pitch bearing, indicating that the test bench can effectively simulate and verify the fretting tribological characteristics of the rollers, raceways, or grease. This application uses rolling friction with the upper raceway 5 and lower raceway 3 in line contact with the cylindrical rollers, and the applied load can reach hundreds of thousands of Newtons, thus effectively simulating the fretting conditions of the three-row wind turbine pitch bearing in actual use. Using rollers of actual size as those in the pitch bearing effectively avoids size effects and ensures experimental accuracy. Furthermore, since only the rollers need to be tested, the test bench is small in size, easy to operate and install, and helps reduce testing costs and time for multiple sets of basic tests.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reciprocating fretting test bench for wind turbine bearings, characterized in that, include: Rack (1); A support platform (2) is slidably mounted on a frame (1) in a horizontal direction; The lower roller (3) is disposed on the support platform (2) and is used to abut against the lower side of the roller. The limiting body (4) is set on the bearing platform (2) and located above the lower raceway (3). The limiting body (4) has a receiving hole (41) for placing the roller roller and grease. The sliding direction of the bearing platform (2) is perpendicular to the rolling axis of the roller roller. Upper raceway (5), which is located above the limiting body (4) and is used to abut against the upper side of the roller; A reciprocating drive mechanism (6) is used to drive the support platform (2) to slide back and forth, and the reciprocating displacement of the support platform (2) is less than 5mm; The loading mechanism (7) is used to drive the upper raceway (5) to press against the roller.

2. The wind turbine bearing reciprocating fretting test bench according to claim 1, characterized in that: A limiting rod (8) is slidably passed through the limiting body (4). The limiting rod (8) extends into the receiving hole (41) and is misaligned with the center of the receiving hole (41). When the roller in the receiving hole (41) abuts against the side of the limiting rod (8) near the center of the receiving hole (41), the roller is located in the middle position of the receiving hole (41).

3. The wind turbine bearing reciprocating fretting test bench according to claim 1, characterized in that: A displacement sensor (9) is provided on the frame (1). The displacement sensor (9) is used to detect the displacement change of the support platform (2). The displacement sensor (9) is electrically connected to an external PLC control system to send the detected displacement change data of the support platform (2).

4. The wind turbine bearing reciprocating fretting test bench according to claim 3, characterized in that: The frame (1) includes a base (101), a guide body (102), columns (103), a top cover (104), and a mounting base (105). The guide body (102) is disposed on the base (101), and the support platform (2) is slidably disposed on the guide body (102). Multiple columns (103) are provided, and each column (103) is disposed vertically on the base (101). The top cover (104) is disposed above the multiple columns (103). The mounting base (105) is located on one side of the base (101). The reciprocating drive mechanism (6) is disposed on the mounting base (105). The loading mechanism (7) is disposed on the top cover (104). The displacement sensor (9) is disposed on the guide body (102).

5. The wind turbine bearing reciprocating fretting test bench according to claim 4, characterized in that: The guide body (102) is a track, which is set on the base (101). Inclined retainers (10) are provided on opposite sides of the track, and horizontal retainers (11) are provided on the track. Guide rollers are installed on both the inclined retainers (10) and the horizontal retainers (11). A guide platform (12) is provided on the lower side of the support platform (2). The width of the guide platform (12) increases towards the track. The opposite sides of the guide platform (12) abut against the guide rollers on the inclined retainers (10) on both sides. The bottom wall of the guide platform (12) abuts against the guide rollers of the horizontal retainer (11).

6. The wind turbine bearing reciprocating fretting test bench according to claim 4, characterized in that: The guide body (102) is provided with limiting plates (13) on opposite sides. The arrangement direction of the two limiting plates (13) is parallel to the sliding direction of the support platform (2). The displacement sensor (9) is set on either limiting plate (13).

7. The wind turbine bearing reciprocating fretting test bench according to claim 4, characterized in that: The reciprocating drive mechanism (6) includes a first drive source (61), a first tension / compression sensor (62), and a pull rod (63). The first drive source (61) is mounted on the mounting base (105). The first tension / compression sensor (62) is mounted on the output end of the first drive source (61). The pull rod (63) is mounted on the first tension / compression sensor (62). The first drive source (61) is used to drive the first tension / compression sensor (62) and the pull rod (63) to move horizontally. The pull rod (63) is connected to the support platform (2). Both the first drive source (61) and the first tension / compression sensor (62) are electrically connected to an external PLC control system.

8. The wind turbine bearing reciprocating fretting test bench according to claim 4, characterized in that: The loading mechanism (7) includes a second drive source (71), a second tension / compression sensor (72), and a pressing platform (73). The second drive source (71) is mounted on the top cover (104). The second tension / compression sensor (72) is mounted on the output end of the second drive source (71). The pressing platform (73) is connected to the second tension / compression sensor (72). The pressing platform (73) is slidably mounted on multiple columns (103). The second drive source (71) is used to drive the second tension / compression sensor (72) and the pressing platform (73) to slide in the vertical direction. The pressing platform (73) is located above the limiting body (4). The upper roller (5) is detachably connected to the pressing platform (73). Both the second drive source (71) and the second tension / compression sensor (72) are electrically connected to an external PLC control system.

9. The wind turbine bearing reciprocating fretting test bench according to claim 8, characterized in that: The pressing platform (73) has two T-shaped connecting grooves (14) opposite to each other. Each T-shaped connecting groove (14) has a T-shaped nut slidably disposed at both ends. The T-shaped nut is threaded with a locking bolt. The upper raceway (5) has a locking hole. The locking hole corresponds to the locking bolt. The locking bolt passes through the corresponding locking hole. The head of the locking bolt abuts against the side of the upper raceway (5) away from the pressing platform (73). The locking bolt is misaligned with the limiting body (4).

10. A reciprocating fretting test bench for wind turbine bearings according to any one of claims 1-9, characterized in that: Multiple connecting screws (15) are provided on the support platform (2). A through hole is provided on the limiting body (4). The through hole corresponds to the connecting screw (15) one by one. The connecting screw (15) passes through the corresponding through hole. A locking nut is threaded on the connecting screw (15). The locking nut abuts against the side of the limiting body (4) away from the support platform (2).

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