Fan main shaft load fatigue detection equipment with environment simulation function

Abstract

The invention relates to the technical field of load fatigue detection, and discloses a fan spindle load fatigue detection device with an environment simulation function, which comprises a load fatigue detection mechanism and a fan spindle mechanism, and is characterized in that one side of the load fatigue detection mechanism is fixedly connected with an environment simulation mechanism; the second gear motor drives the positioning gear to rotate in a reciprocating mode, the first gear motor drives the supporting limiting frame to rotate, then the positioning ring and the force application base are driven to make intermittent contact with stress bases of different heights on the simulation stress disc, and simulation of dynamic acting force of different sizes in all directions of the fan spindle is achieved. By means of the design, load control in the testing process is more accurate and flexible. Through the environment simulation mechanism, especially the alternative contact design of the simulation stress disc and the force application seat, the non-periodic and irregular load borne by the fan main shaft in the actual operation can be simulated. The simulation mode is closer to the real working condition, and the accuracy and reliability of the test are improved.

Description

Technical Field

[0001] This invention belongs to the field of load fatigue testing technology, and specifically relates to a wind turbine main shaft load fatigue testing device with environmental simulation function. Background Technology

[0002] As a core device for evaluating the long-term operational reliability of wind turbine main shafts, the wind turbine main shaft load fatigue testing equipment works by simulating dynamic loads under actual operating conditions to monitor the stress, strain, and fatigue damage accumulation characteristics of key parts of the main shaft, thereby predicting its fatigue life and ensuring the safe operation of the unit. This equipment integrates a sensor system, data acquisition module, multi-degree-of-freedom loading system, and intelligent analysis software to achieve a quantitative assessment of the main shaft's fatigue performance. Its core technology lies in constructing a load environment close to real-world operating conditions and establishing an accurate fatigue life prediction model.

[0003] However, existing technologies have significant limitations: traditional testing equipment mostly uses static counterweight loading, which can only simulate periodic loads. In actual wind turbine operation, the loads on the main bearing are significantly non-periodic, irregular, and influenced by multiple factors, including wind speed changes, wind direction fluctuations, and turbine vibration. This makes it difficult for existing testing methods to accurately reproduce the real environmental load spectrum. Furthermore, fixed counterweight loading systems cannot simulate the centrifugal inertial forces, aerodynamic load alternation characteristics, and dynamic vibrations caused by blade gravity generated during rotor rotation. This results in significant deviations between test results and actual operating conditions, making it difficult to effectively assess the true fatigue damage accumulation patterns of the main shaft in complex service environments.

[0004] Therefore, it is necessary to invent a wind turbine main shaft load fatigue testing device with environmental simulation function to solve the above problems. It can break through the traditional static testing mode and perform environmental simulation through multi-mechanism coupling. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a wind turbine main shaft load fatigue testing device with environmental simulation function, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wind turbine main shaft load fatigue testing device with environmental simulation function, comprising a load fatigue testing mechanism and a wind turbine main shaft mechanism, wherein an environmental simulation mechanism is fixedly connected to one side of the load fatigue testing mechanism, wherein...

[0007] The environmental simulation mechanism includes a support positioning frame and a simulated force-bearing plate. A rotating disk is rotatably connected to the top of one side of the support positioning frame, and a support limiting frame is fixedly connected to one side of the rotating disk. A limiting plate is rotatably connected to one end of the inner wall of the support limiting frame, and connecting rods are fixedly connected to both sides of the limiting plate. A positioning ring is connected to one end of each of the two connecting rods, and a force-applying seat is fixedly provided at both ends of the positioning ring. A simulated positioning toothed ring is fixedly provided at the middle position of the outer wall of the positioning ring. A positioning gear is rotatably connected to the other end of the inner wall of the support limiting frame, and the tooth surface of the positioning gear meshes with the tooth surface of the simulated positioning toothed ring. Multiple force-bearing seats are fixedly provided on the outer wall of one side of the simulated force-bearing plate, and the heights of the multiple force-bearing seats are different. One end of each of the two force-applying seats alternately contacts any one of the force-bearing seats.

[0008] Preferably, a first reduction motor is fixedly provided on one side of the support positioning frame, and the output end of the first reduction motor is fixedly connected to one side of the rotating disk. A second reduction motor is fixedly provided on one side of the support limiting frame, and the output end of the second reduction motor is fixedly connected to one side of the positioning gear.

[0009] Preferably, the fan main shaft mechanism includes a fan main positioning shaft, one end of which is fixedly connected to a support positioning flange, and the outer end of the support positioning flange is provided with multiple positioning holes.

[0010] Preferably, the load fatigue testing mechanism includes a support positioning base, a load fatigue testing seat fixedly connected to the top of the support positioning base via a mounting base, a load fatigue testing seat rotatably connected to one end of the outer wall of the main positioning shaft of the fan at its middle position, a test positioning gear ring fixedly connected to one end of the outer wall of the main positioning shaft of the fan, a mounting base fixedly connected to one end of the top of the support positioning base, a test gear rotatably connected to the middle position of the mounting base, the tooth surface of the test gear meshing with the tooth surface of the test positioning gear ring, a drive motor fixedly mounted at one end of the mounting base, the output end of the drive motor passing through the mounting base and fixedly connected to the middle position of the test positioning gear ring, and multiple test pressure sensors fixedly connected to the outer wall of the load fatigue testing seat.

[0011] Preferably, four positioning posts are fixedly connected to the middle position on one side of the simulated force-bearing plate. One end of the outer wall of the four positioning posts is inserted and connected to the middle position of the four positioning holes respectively, and the other end of the outer wall of the four positioning posts is threaded with a positioning bolt.

[0012] Preferably, a simulated gravity control mechanism is fixedly connected to one side of the simulated force-bearing disk. The simulated gravity control mechanism includes a control gear ring fixed to the outer wall of one side of the simulated force-bearing disk. Three control gears are meshed on the tooth surfaces of the control gear ring. A connecting frame is connected to one side of the three control gears. A balancing frame is fixedly connected to the bottom end of the outer wall of the connecting frame. A receiving frame is fixedly connected to the bottom end of the balancing frame.

[0013] Preferably, the receiving frame has a counterweight internally engaged, and the weight of the counterweight is changed according to the test force.

[0014] Preferably, one side of the simulated force plate is fixedly connected to multiple connecting seats, one end of each of the multiple connecting seats is connected to a protective ring, and one end of each of the three control gears is in contact with one side of the inner wall of the protective ring.

[0015] Preferably, a balance support mechanism is provided at one end of the top of the support positioning frame. The balance support mechanism includes four support rods fixed to the outer wall of the support limiting frame. One end of each of the four support rods is connected to a support ring. A limiting groove is provided in the middle of the outer wall of the support ring. A balance support frame is fixed at one end of the top of the support positioning frame. Three balance protection shafts are rotatably connected to the top of the balance support frame. The outer walls of the three balance protection shafts are in support contact with the inner wall of the limiting groove.

[0016] Preferably, an intelligent control panel is fixedly provided on one side of the support positioning base, and the first geared motor, the second geared motor, the drive motor and multiple test pressure sensors are all electrically connected to an external power supply through the intelligent control panel.

[0017] The technical effects and advantages of this invention are as follows:

[0018] 1. This invention uses a second geared motor to drive the positioning gear to reciprocate, while the first geared motor drives the support limit frame to rotate. This causes the positioning ring and the force-applying seat to intermittently contact the force-applying seats at different heights on the simulated force-bearing plate, thus simulating dynamic forces of different magnitudes and directions on the wind turbine main shaft. This design makes load control during testing more precise and flexible. Through the environmental simulation mechanism, especially the alternating contact design of the simulated force-bearing plate and the force-applying seat, it can simulate the non-periodic and irregular loads that the wind turbine main shaft experiences during actual operation. This simulation method is closer to real working conditions, improving the accuracy and reliability of the test.

[0019] 2. This invention achieves dynamic simulation of the alternating characteristics of centrifugal inertial force and aerodynamic load during the rotation of the wind turbine main shaft by simulating the meshing transmission of the control ring and control gear in the gravity control mechanism, combined with replaceable counterweights. This simulation method improves the fidelity of the test data to the real working conditions. The simulated gravity control mechanism simulates the dynamic vibration caused by the weight of the blades, and the overall design of the environmental simulation mechanism takes into account the influence of multiple factors such as wind direction fluctuations and unit vibration, realizing the simulation of complex environments with multiple factors superimposed.

[0020] 3. The present invention uses four support rods of the balance support mechanism to firmly connect the support ring and the support limiting frame. The limiting groove on the outer wall of the support ring and the three balance protection shafts at the top of the balance support frame form a tight support contact. This design ensures that the environmental simulation mechanism is supported by balanced gravity during operation, effectively reducing the instability of operation caused by uneven gravity or vibration, and improving the stability of the testing process.

[0021] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the angle of the wind turbine main shaft load fatigue testing equipment of the present invention;

[0024] Figure 2 This is a schematic diagram of angle two of the wind turbine main shaft load fatigue testing equipment of the present invention;

[0025] Figure 3 This is a schematic diagram of the load fatigue testing mechanism and the fan main shaft mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram showing the distribution angles of the environmental simulation mechanism and the balance support mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram showing the distribution angles of the environmental simulation mechanism and the balance support mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the environmental simulation mechanism of the present invention;

[0029] Figure 7 This is a schematic diagram of the balance support mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the distribution angle of the simulated gravity control mechanism of the present invention;

[0031] Figure 9 This is a schematic diagram of the distribution angle of the simulated gravity control mechanism of the present invention;

[0032] Figure 10 This is a schematic diagram of the angle of the simulated force-bearing disk in this invention;

[0033] Figure 11 This is a schematic diagram of the simulated force-bearing disk angle two of the present invention;

[0034] Figure 12 This is a schematic diagram of the gravity control mechanism of the present invention.

[0035] In the diagram: 1. Load fatigue testing mechanism; 101. Support positioning base; 102. Mounting base; 103. Load fatigue test seat; 104. Test positioning gear ring; 105. Mounting seat; 106. Test gear; 107. Drive motor; 108. Test pressure sensor; 2. Environmental simulation mechanism; 201. Support positioning frame; 202. Rotary disk; 203. Support limiting frame; 204. First geared motor; 205. Limiting disk; 206. Connecting rod; 207. Positioning ring; 208. Force application seat; 209. Simulated positioning gear ring; 210. Positioning gear; 211. Second geared motor 1. Machine; 212. Simulated force plate; 213. Force seat; 214. Positioning column; 215. Positioning bolt; 3. Simulated gravity control mechanism; 301. Control gear ring; 302. Connecting seat; 303. Protective ring; 304. Control gear; 305. Connecting frame; 306. Balance frame; 307. Receiving frame; 308. Counterweight; 4. Balance support mechanism; 401. Support rod; 402. Support ring; 403. Limiting groove; 404. Balance support frame; 405. Balance protection shaft; 5. Fan main shaft mechanism; 501. Fan main positioning shaft; 502. Support positioning flange; 503. Positioning hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This invention provides, for example Figure 1-12 The device shown is a wind turbine main shaft load fatigue testing device with environmental simulation function, including a load fatigue testing mechanism 1 and a wind turbine main shaft mechanism 5. An environmental simulation mechanism 2 is fixedly connected to one side of the load fatigue testing mechanism 1.

[0038] In one specific embodiment of the present invention, the fan main shaft mechanism 5 includes a fan main positioning shaft 501, one end of which is fixedly connected to a support positioning flange 502, and the outer end of the support positioning flange 502 is provided with a plurality of positioning holes 503.

[0039] As a specific embodiment of the present invention, the load fatigue testing mechanism 1 includes a support positioning base 101. The top end of the support positioning base 101 is fixedly connected to a load fatigue testing seat 103 via a mounting base 102. The middle position of the load fatigue testing seat 103 is rotatably connected to one end of the outer wall of the main positioning shaft 501 of the fan. One end of the outer wall of the main positioning shaft 501 of the fan is fixedly connected to a test positioning gear ring 104. One end of the top of the support positioning base 101 is fixedly connected to a mounting base 105. The middle position of the mounting base 105 is rotatably connected to a test gear 106. The tooth surface of the test gear 106 meshes with the tooth surface of the test positioning gear ring 104. One end of the mounting base 105 is fixedly provided with a drive motor 107. The output end of the drive motor 107 passes through the mounting base 105 and is fixedly connected to the middle position of the test positioning gear ring 104. The outer wall of the load fatigue testing seat 103 is fixedly connected to a plurality of test pressure sensors 108.

[0040] When the wind turbine main shaft load fatigue testing equipment with environmental simulation function is required to perform load fatigue testing on the wind turbine main shaft, the wind turbine main positioning shaft 501 of the wind turbine main shaft mechanism 5 is rotatably installed inside the load fatigue test seat 103, and the test positioning gear ring 104 is positioned on the outer wall of the wind turbine main positioning shaft 501. The positioning column 214 with one end of the simulated force plate 212 is fixed and inserted into the four positioning holes 503 respectively, and is threaded and positioned by the positioning bolt 215, so that the simulated force plate 212 is stably positioned on one side of the support positioning flange 502, thus completing the preparation work for load fatigue testing.

[0041] The output end of the drive motor 107, which is fixed on one side of the mounting base 105, drives the test gear 106 to rotate. The tooth surface of the test gear 106 meshes with the tooth surface of the test positioning gear ring 104, causing the main positioning shaft 501 of the fan, which is fixed on the inner wall of the test positioning gear ring 104, to rotate along the inner wall of the load fatigue test seat 103. Multiple test pressure sensors 108, which are fixed on the outer wall of the load fatigue test seat 103, dynamically transmit pressure data and constantly monitor the load fatigue of the main positioning shaft 501 of the fan.

[0042] The environmental simulation mechanism 2 includes a support positioning frame 201 and a simulated force-bearing plate 212. A rotating plate 202 is rotatably connected to the top of one side of the support positioning frame 201. A support limiting frame 203 is fixedly connected to one side of the rotating plate 202. A limiting plate 205 is rotatably connected to one end of the inner wall of the support limiting frame 203. Connecting rods 206 are fixedly connected to both sides of the limiting plate 205. A positioning ring 207 is connected to one end of each connecting rod 206. Force-applying seats 208 are fixedly provided at both ends of the positioning ring 207. A simulated positioning toothed ring 209 is fixedly provided at the middle position of the outer wall of the positioning ring 207. A positioning gear 210 is rotatably connected to the other end of the inner wall of the support limiting frame 203. The tooth surface of the positioning gear 210 meshes with the tooth surface of the simulated positioning toothed ring 209. Multiple force-bearing seats 213 are fixedly provided on the outer wall of one side of the simulated force-bearing plate 212. The heights of the multiple force-bearing seats 213 are different. One end of each of the two force-applying seats 208 alternately contacts any one of the force-bearing seats 213.

[0043] Four positioning posts 214 are fixedly connected to the middle position of one side of the simulated force-bearing plate 212. One end of the outer wall of the four positioning posts 214 is inserted and connected to the middle position of the four positioning holes 503 respectively. The other end of the outer wall of the four positioning posts 214 is threaded with a positioning bolt 215.

[0044] A first reduction motor 204 is fixedly installed on one side of the support positioning frame 201. The output end of the first reduction motor 204 is fixedly connected to one side of the rotating disk 202. A second reduction motor 211 is fixedly installed on one side of the support limiting frame 203. The output end of the second reduction motor 211 is fixedly connected to one side of the positioning gear 210.

[0045] The output end of the second reduction motor 211, fixed to one side of the support limit frame 203, drives the positioning gear 210 to reciprocate. The tooth surface of the positioning gear 210 meshes with the tooth surface of the simulated positioning gear ring 209, causing the positioning ring 207, fixed to one side of the simulated positioning gear ring 209, to cause the two force-applying seats 208 to intermittently contact the simulated force-receiving plate 212 and the force-receiving seat 213 fixed to one side of the simulated force-receiving plate 212. The output end of the first reduction motor 204, fixed to one side of the support positioning frame 201, drives the rotating disk 202 to rotate, causing the rotating disk 202 to drive the support limit frame 203, the positioning ring 207, and the two force-applying seats 208 to reciprocate. Furthermore, since the heights of the force-bearing seats 213 fixed on one side of the simulated force-bearing disk 212 are inconsistent, and the contact time and position between the force-applying seat 208 and each force-bearing seat 213 are different, the simulated force-bearing disk 212 will be subjected to different magnitudes of force in each direction. As a result, the support positioning flange 502 fixed on the back side of the simulated force-bearing disk 212 and the main positioning shaft 501 of the wind turbine will be subjected to different compressions in different directions and at different times. This simulates the various wind forces encountered by the main positioning shaft 501 of the wind turbine during natural operation, improves the accuracy of the test data for the fatigue test of the wind turbine main shaft load, and is conducive to building a load environment close to the real working conditions and establishing an accurate fatigue life prediction model.

[0046] As a specific embodiment of the present invention, a simulated gravity control mechanism 3 is fixedly connected to one side of the simulated force-bearing disk 212. The simulated gravity control mechanism 3 includes a control gear ring 301 fixed to the outer wall of one side of the simulated force-bearing disk 212. Three control gears 304 are meshed on the tooth surface of the control gear ring 301. A connecting frame 305 is connected to one side of the three control gears 304. A balance frame 306 is fixedly connected to the bottom end of the outer wall of the connecting frame 305. A receiving frame 307 is fixedly connected to the bottom end of the balance frame 306.

[0047] The internal locking mechanism of the receiving frame 307 is equipped with a counterweight 308, the weight of which is replaced according to the test force.

[0048] Multiple connecting seats 302 are fixedly connected to one side of the simulated force-bearing disk 212. One end of each connecting seat 302 is connected to a protective ring 303. One end of each of the three control gears 304 is in contact with one side of the inner wall of the protective ring 303.

[0049] When the simulated force-bearing disk 212 rotates, the control gear ring 301 fixed to one side of the simulated force-bearing disk 212 rotates synchronously. The three control gears 304 meshing on the inner wall of the control gear ring 301 all mesh and rotate. Through the connection of the connecting frame 305 and the assistance of the balance frame 306 fixed to the bottom of the connecting frame 305, the receiving frame 307 and the counterweight 308 are always supported by downward gravity. This ensures that the three control gears 304 drive the connecting frame 305, the balance frame 306, the receiving frame 307, and the counterweight 308 to maintain a constant downward force. The control gear 304 and the control gear ring 301 are only meshed together. As the control gear 304 and the control gear ring 301 are only meshed together, the force direction of the counterweight block 308 at the bottom of the simulated force plate 212 is unstable due to the influence of centrifugal inertia when the simulated force plate 212 rotates. The meshing rotation of the control gear ring 301 and the control gear 304, as well as the continuous downward force of the receiving frame 307, naturally simulate the dynamic vibration caused by the weight of the blades, thus maintaining the authenticity of the environmental simulation for the fatigue test of the wind turbine main shaft load.

[0050] By fixing the connecting seat 302 and the protective ring 303 on the back side of the simulated force plate 212, one side of each of the three control gears 304 is in contact with the inner side of the protective ring 303, so that the control gears 304 and the control gear ring 301 mesh stably, avoiding the potential problem of the three control gears 304, connecting frame 305, balance frame 306, receiving frame 307 and counterweight 308 falling off.

[0051] In one specific embodiment of the present invention, a balance support mechanism 4 is provided at one end of the top of the support positioning frame 201. The balance support mechanism 4 includes four support rods 401 fixed to the outer wall of the support limiting frame 203. One end of the four support rods 401 is connected to a support ring 402. A limiting groove 403 is provided in the middle of the outer wall of the support ring 402. A balance support frame 404 is fixed at one end of the top of the support positioning frame 201. Three balance protection shafts 405 are rotatably connected to the top of the balance support frame 404. The outer walls of the three balance protection shafts 405 are all in support contact with the inner wall of the limiting groove 403.

[0052] Supported by the balance support frame 404 fixed to the top of the support positioning frame 201, the three balance protection shafts 405 rotating at the top of the balance support frame 404 all rotate on the outer wall of the support ring 402 and are stably limited by the limiting groove 403, so that the support ring 402 is supported by gravity. Furthermore, the support rod 401 provides gravity support for the support limiting frame 203. This ensures the operational stability of the environmental simulation mechanism 2 during the fatigue test of the wind turbine main shaft load, avoiding potential operational instability issues caused by prolonged operation.

[0053] In one specific embodiment of the present invention, an intelligent control panel is fixedly provided on one side of the support positioning base 101. The first reduction motor 204, the second reduction motor 211, the drive motor 107 and multiple test pressure sensors 108 are all electrically connected to an external power supply through the intelligent control panel.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind turbine main shaft load fatigue testing device with environmental simulation function, comprising a load fatigue testing mechanism (1) and a wind turbine main shaft mechanism (5), characterized in that: An environmental simulation mechanism (2) is fixedly connected to one side of the load fatigue testing mechanism (1), wherein, The environmental simulation mechanism (2) includes a support positioning frame (201) and a simulated force plate (212). A rotating plate (202) is rotatably connected to the top of one side of the support positioning frame (201). A support limiting frame (203) is fixedly connected to one side of the rotating plate (202). A limiting plate (205) is rotatably connected to one end of the inner wall of the support limiting frame (203). Connecting rods (206) are fixedly connected to both sides of the limiting plate (205). A positioning ring (207) is connected to one end of each of the two connecting rods (206). Both ends of the positioning ring (207) are fixedly connected to the positioning ring (207). A force-applying seat (208) is fixedly provided. A simulated positioning toothed ring (209) is fixedly provided at the middle position of the outer wall of the positioning ring (207). A positioning gear (210) is rotatably connected to the other end of the inner wall of the support limit frame (203). The tooth surface of the positioning gear (210) meshes with the tooth surface of the simulated positioning toothed ring (209). Multiple force-receiving seats (213) are fixedly provided on the outer wall of one side of the simulated force-receiving plate (212). The heights of the multiple force-receiving seats (213) are different. One end of two force-applying seats (208) alternately contacts any one of the force-receiving seats (213).

2. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 1, characterized in that: A first reduction motor (204) is fixedly installed on one side of the support positioning frame (201), and the output end of the first reduction motor (204) is fixedly connected to one side of the rotating disk (202). A second reduction motor (211) is fixedly installed on one side of the support limiting frame (203), and the output end of the second reduction motor (211) is fixedly connected to one side of the positioning gear (210).

3. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 1, characterized in that: The fan main shaft mechanism (5) includes a fan main positioning shaft (501), one end of which is fixedly connected to a support positioning flange (502), and the outer end of the support positioning flange (502) is provided with multiple positioning holes (503).

4. The fan spindle load fatigue testing device with environmental simulation function according to claim 2, characterized in that: The load fatigue testing mechanism (1) includes a support positioning base (101), the top of which is fixedly connected to a load fatigue test seat (103) via a mounting base (102). The middle position of the load fatigue test seat (103) is rotatably connected to one end of the outer wall of the main positioning shaft (501) of the fan. One end of the outer wall of the main positioning shaft (501) of the fan is fixedly connected to a test positioning gear ring (104). One end of the top of the support positioning base (101) is fixedly connected to a mounting base (102). 05), a test gear (106) is rotatably connected to the middle position of the mounting base (105). The tooth surface of the test gear (106) meshes with the tooth surface of the test positioning gear ring (104). A drive motor (107) is fixedly provided at one end of the mounting base (105). The output end of the drive motor (107) passes through the mounting base (105) and is fixedly connected to the middle position of the test positioning gear ring (104). Multiple test pressure sensors (108) are fixedly connected to the outer wall of the load fatigue test seat (103).

5. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 1, characterized in that: Four positioning posts (214) are fixedly connected to the middle position on one side of the simulated force plate (212). One end of the outer wall of the four positioning posts (214) is inserted and connected to the middle position of the four positioning holes (503) respectively. The other end of the outer wall of the four positioning posts (214) is threaded with a positioning bolt (215).

6. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 1, characterized in that: A simulated gravity control mechanism (3) is fixedly connected to one side of the simulated force-bearing disk (212). The simulated gravity control mechanism (3) includes a control gear ring (301) fixed to the outer wall of one side of the simulated force-bearing disk (212). The tooth surfaces of the control gear ring (301) are meshed with three control gears (304). A connecting frame (305) is connected to one side of the three control gears (304). A balance frame (306) is fixedly connected to the bottom of the outer wall of the connecting frame (305). A receiving frame (307) is fixedly connected to the bottom of the balance frame (306).

7. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 6, characterized in that: The receiving frame (307) is internally connected to a counterweight (308), the weight of which is changed according to the test force.

8. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 6, characterized in that: The simulated force plate (212) is fixedly connected to one side of multiple connecting seats (302), and one end of each of the multiple connecting seats (302) is connected to a protective ring (303). One end of each of the three control gears (304) is in contact with one side of the inner wall of the protective ring (303).

9. The wind turbine main shaft load fatigue testing device with environmental simulation function according to claim 1, characterized in that: The top end of the support positioning frame (201) is provided with a balance support mechanism (4). The balance support mechanism (4) includes four support rods (401) fixed to the outer wall of the support limiting frame (203). One end of the four support rods (401) is connected to a support ring (402). A limiting groove (403) is provided in the middle of the outer wall of the support ring (402). The top end of the support positioning frame (201) is fixed with a balance support frame (404). The top end of the balance support frame (404) is rotatably connected to three balance protection shafts (405). The outer walls of the three balance protection shafts (405) are all in support contact with the inner wall of the limiting groove (403).

10. The fan spindle load fatigue testing device with environmental simulation function according to claim 4, characterized in that: A smart control panel is fixedly provided on one side of the support positioning base (101). The first geared motor (204), the second geared motor (211), the drive motor (107) and multiple test pressure sensors (108) are all electrically connected to an external power supply through the smart control panel.

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