Blade structure of land wind generating set

Abstract

The invention provides a blade structure of a land wind generating set, which relates to the technical field of wind power generation and comprises a blade body, a first cavity and a second cavity are arranged in the blade body, a plurality of reinforcing ribs are respectively arranged in the first cavity and the second cavity, and a connecting column is inserted between the upper reinforcing rib and the lower reinforcing rib. A fixing column is fixedly arranged at the end, extending out of the blade body, of the connecting column, one end of the fixing column is fixedly connected with the blade body, and the other end of the fixing column is in transmission connection with a hub on the wind generating set through a bearing. The multiple blade bodies are in transmission connection with the hub through the bearings, wind power is converted into electric energy through the effect of the wind generating set, the weight of the blade bodies is reduced through the design of the first cavities and the second cavities, the rotating efficiency of the blade bodies is improved, and normal and stable operation of the wind generating set is guaranteed through the design of the blade structure.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a blade structure of a land wind power generator set. Background Art

[0002] As a clean and renewable energy form, wind power generation has been widely used around the world. Among them, wind turbine blades are key components, and their performance directly affects the power generation efficiency and operational stability of the entire system.

[0003] Traditional blade structures, such as the integrated wind turbine blades disclosed in CN204299798U, are prone to damage or performance degradation due to insufficient connection strength when facing extreme weather conditions. Good design, reliable quality and superior performance are the decisive factors to ensure the normal and stable operation of the unit. Therefore, it is particularly important to develop a new blade structure. Summary of the invention

[0004] The present invention provides a blade structure of a land wind turbine generator set to solve the defects in the prior art.

[0005] The present invention provides a blade structure of a land wind turbine generator set, comprising: a blade body, a first cavity and a second cavity are arranged in the blade body, a plurality of reinforcing ribs are respectively arranged in the first cavity and the second cavity, a connecting column is inserted between the upper and lower reinforcing ribs, a fixing column is fixedly arranged on one end of the connecting column extending out of the blade body, one end of the fixing column is fixedly connected to the blade body, and the other end of the fixing column is connected to the hub on the wind turbine generator set through a bearing transmission.

[0006] Preferably, through hole one is provided on the reinforcing rib, through hole two is provided on the surface of the blade body at a position corresponding to the reinforcing rib, through hole three is provided at a position where the connecting column contacts the reinforcing rib, and through hole one, through hole two and through hole three are coaxially arranged and fixedly connected by rotating bolts.

[0007] Preferably, the outer surface of the blade body is inlaid with a conductive layer arranged in a mesh shape, and the conductive layer is flush with the outer surface of the blade body. The blade body is provided with a plurality of square holes, and a conductive head 1 is provided in the square hole. The top of the conductive head 1 is flush with the outer surface of the blade body, and the conductive head 1 is electrically connected to the conductive layer. The conductive head 1 is connected to the conductive head 2 through a conductive bolt, and the conductive head 2 is arranged on the inner walls of the first cavity and the second cavity. A rubber layer is provided on the inner walls of the first cavity and the second cavity. The plurality of conductive heads are electrically connected through cable wires, and the cable wires are electrically connected to the generator set.

[0008] Preferably, the oil sealing assembly is arranged on the bearing, and the oil sealing assembly comprises an oil sealing sleeve, which is arranged on the bearing and communicated with the inside of the bearing, and the oil sealing sleeve rotates synchronously with the bearing, and an oil sealing port is arranged on one side of the oil sealing sleeve, and an oil storage chamber is formed between the oil sealing sleeve, the oil sealing port and the bearing, and a telescopic groove is arranged in the oil sealing port, and a telescopic ring is arranged in the telescopic groove, and blocks are respectively arranged on both sides of the telescopic ring, a buffer spring is arranged between one end of the telescopic ring and the telescopic groove, and an anti-wear block is arranged at the other end of the telescopic ring, and the anti-wear block abuts against the outer surface of the wheel hub.

[0009] Preferably, the oil sealing sleeve is connected to the bearing via two oil pipes, the two oil pipes are symmetrically arranged around the axis of the oil sealing sleeve, and an oil pump and a switch valve are arranged in the oil pipes.

[0010] Preferably, it also includes:

[0011] Contact force detection module 1 is used to measure the normal contact force between a single roller and the inner raceway in the bearing;

[0012] Contact force detection module 2 is used to measure the normal contact force between a single roller and the outer raceway in the bearing;

[0013] Angle detection module 1, used to measure the contact angle between the inner roller and the inner raceway of the bearing;

[0014] Angle detection module 2 is used to measure the contact angle between the inner roller and the outer raceway of the bearing;

[0015] Angle detection module three is used to measure the contact angle between the large end face of the inner roller of the bearing and the inner ring rib;

[0016] Calculation module 1, used to calculate the contact displacement between the roller and the inner and outer raceways based on the normal contact force between a single roller and the inner raceway in the bearing;

[0017] An alarm module, used for issuing an alarm;

[0018] A processing module, used for comparing the contact displacement between the inner roller and the inner and outer raceways of the bearing obtained by the calculation module 1 with the preset maximum contact displacement between the roller and the inner and outer raceways;

[0019] The control module controls the alarm to sound an alarm and controls the wind turbine generator set to stop and prepare for maintenance when the contact displacement between the inner roller of the bearing and the inner and outer raceways is greater than the preset maximum contact displacement between the inner roller of the bearing and the inner and outer raceways. The wind turbine generator works normally when the contact displacement between the inner roller of the bearing and the inner and outer raceways is less than or equal to the preset maximum contact displacement between the inner roller of the bearing and the inner and outer raceways.

[0020] Preferably, the calculation module 1 calculates based on the following formula 1:

[0021]

[0022] δ is the contact displacement between the inner roller and the inner and outer raceways of the bearing, F 1 is the normal contact force between a single roller and the inner raceway in the bearing, F 2 is the normal contact force between a single roller and the outer raceway in the bearing, ω 1 is the contact angle between the inner roller and the inner raceway of the bearing, ω 2 is the contact angle between the inner roller and the outer raceway of the bearing, ω 3 is the contact angle between the large end face of the inner roller and the inner ring rib, μ 1 is the Poisson's ratio of the inner raceway, μ 2 is the Poisson's ratio of the outer raceway, E 1 is the elastic modulus of the inner raceway, E 2 is the elastic modulus of the outer raceway, S 1 S is the diameter ratio of the inner roller to the inner raceway of the bearing. 2 D is the diameter ratio of the inner roller to the outer raceway of the bearing. 1 is the length of the inner roller of the bearing, D 2 is the diameter of the inner roller of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the cross-sectional structure of the middle section of the blade body provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of a half-section structure of an oil sealing assembly provided in an embodiment of the present invention.

[0027] Reference numerals:

[0028] 1. Blade body; 11. First cavity; 111. Through hole 2; 12. Second cavity; 13. Reinforcement rib; 131. Through hole 1; 14. Connecting column; 141. Through hole 3; 142. Rotating bolt; 15. Fixing column; 16. Conductive layer; 17. Square hole; 171. Conductive head 1; 172. Conductive bolt; 173. Conductive head 2; 174. Cable wire; 18. Oil sealing assembly; 181. Oil sealing sleeve; 182. Oil sealing port; 183. Telescopic groove; 184. Telescopic ring; 185. Block; 186. Buffer spring; 187. Anti-wear block; 188. Oil pipe; 2. Wheel hub; 3. Bearing. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides the following embodiments

[0032] Example 1

[0033] The embodiment of the present invention provides a blade structure of a land wind turbine generator set, such as Figure 1-Figure 3 As shown, it includes: a blade body 1, a first cavity 11 and a second cavity 12 are provided in the blade body 1, a plurality of reinforcing ribs 13 are respectively provided in the first cavity 11 and the second cavity 12, a connecting column 14 is inserted between the upper and lower reinforcing ribs 13, and a fixing column 15 is fixedly provided at one end of the connecting column 14 extending out of the blade body 1, one end of the fixing column 15 is fixedly connected to the blade body 1, and the other end of the fixing column 15 is transmission-connected to the hub 2 on the wind turbine generator set through a bearing 3.

[0034] The working principle and beneficial effects of the above technical solution are as follows: under the action of wind force in nature, the blade body 1 of the wind turbine installed on land rotates, and multiple blade bodies 1 are connected to the hub 2 through bearings 3 and then converted into electrical energy through the action of the wind turbine. The design of the first cavity 11 and the second cavity 12 reduces the weight of the blade body 1 and improves the rotation efficiency of the blade body 1. The reinforcing ribs 13 strengthen the structure of the blade body 1 on the basis of the existence of the first cavity 11 and the second cavity 12. The upper and lower reinforcing ribs 13 fix the connecting column 14, and the fixing column 15 fixes the two connecting columns 14 extending out of one end of the blade body 1 together. The two reinforcing ribs 13 enhance the connection strength between the fixing column 15 and the blade body 1. The fixing column 15 is connected to the hub 2 on the wind turbine through bearings 3. The bearing 3 is responsible for bearing and transmitting the mechanical energy generated by the wind wheel to ensure that the energy can be smoothly transmitted to the generator. The design of the blade structure ensures the normal and stable operation of the wind turbine.

[0035] Example 2

[0036] On the basis of Example 1, Figure 1-Figure 3 As shown, a through hole 131 is provided on the reinforcing rib 13, a through hole 2 111 is provided on the surface of the blade body 1 at a position corresponding to the reinforcing rib 13, a through hole 3 141 is provided at a position where the connecting column 14 contacts the reinforcing rib 13, and the through hole 131, the through hole 2 111, and the through hole 3 141 are coaxially arranged and fixedly connected by rotating bolts 142.

[0037] The working principle and beneficial effects of the above technical solution are as follows: a plurality of through holes 111 are arranged on the blade body 1, and a plurality of reinforcing ribs 13 in the first cavity 11 and the second cavity 12 are provided with through holes 131 corresponding to the through holes 111, and through holes 141 are provided on the corresponding upper and lower reinforcing ribs 13. The upper and lower reinforcing ribs 13, the blade body 1 and the connecting column 14 are stably fixedly connected by rotating the bolts 142, so that the through holes 131, the through holes 111 and the through holes 141 are installed and reinforced, which further strengthens the structural strength of the blade body 1 and makes it difficult for the blade body 1 to separate from the fixing column 15, making the connection more compact.

[0038] Example 3

[0039] On the basis of Example 2, Figure 1-Figure 3As shown, the outer surface of the blade body 1 is inlaid with a conductive layer 16 arranged in a mesh shape, and the conductive layer 16 is flush with the outer surface of the blade body 1. The blade body 1 is provided with a plurality of square holes 17, and a conductive head 171 is provided in the square hole 17. The top of the conductive head 171 is flush with the outer surface of the blade body 1, and the conductive head 171 is electrically connected to the conductive layer 16. The conductive head 171 is connected to the conductive head 2 173 through a conductive bolt 172, and the conductive head 2 173 is arranged on the inner walls of the first cavity 11 and the second cavity 12. A rubber layer is arranged on the inner walls of the first cavity 11 and the second cavity 12. The plurality of conductive heads are electrically connected through a cable wire 174, and the cable wire 174 is electrically connected to the generator set.

[0040] The working principle and beneficial effects of the above technical solution are as follows: the conductive layer 16 is a metal mesh or a metal foil made of a metal such as copper or aluminum as in the embodiment shown. The mesh-shaped arrangement structure reduces the influence of the weight of the metal foil on the blade body 1 and does not affect the transmission of current by the metal foil. The metal foil is embedded in the outer surface of the blade body 1 and combined with it. The conductive layer 16 ensures the aerodynamic shape of the outer surface of the blade body 1. The conductive head 171 is arranged in the square hole 17, which also ensures the aerodynamic shape of the outer surface of the blade body 1. The blade body 1 fixes and limits the conductive head 171 and the conductive bolt 172. The mesh-arranged conductive layer 16 transfers the received electricity to the conductive head 171. The conductive head 171 transfers the electricity to the conductive head 2 173 through the conductive bolt 172. The multiple conductive heads 2 173 fix the cable wire 174. The cable wire 174 transfers the electricity in the multiple conductive heads 2 173. The cable wire 174 guides the transferred electricity to the generator set for processing. The rubber layer prevents the blade body 1 from interfering with the power transmission of the cable wire 174.

[0041] Example 4

[0042] On the basis of Example 3, Figure 1-Figure 3As shown, it also includes an oil sealing component 18, which is arranged on the bearing 3. The oil sealing component 18 includes an oil sealing sleeve 181, which is sleeved on the bearing 3 and communicated with the inside of the bearing 3. The oil sealing sleeve 181 rotates synchronously with the bearing 3, and an oil sealing port 182 is provided on one side of the oil sealing sleeve 181. An oil storage chamber is formed between the oil sealing sleeve 181, the oil sealing port 182 and the bearing 3, and a telescopic groove 183 is provided in the oil sealing port 182. A telescopic ring 184 is provided in the telescopic groove 183, and blocks 185 are respectively provided on both sides of the telescopic ring 184. A buffer spring 186 is provided between one end of the telescopic ring 184 and the telescopic groove 183, and an anti-wear block 187 is provided at the other end of the telescopic ring 184, and the anti-wear block 187 abuts against the outer surface of the wheel hub 2.

[0043] The working principle and beneficial effects of the above technical solution are as follows: the oil sealing sleeve 181 rotates synchronously with the bearing 3, and the lubricating oil overflowing from the bearing 3 during rotation flows into the oil storage chamber for storage. While storing the lubricating oil, the lubricating oil is prevented from flowing out to pollute other components. The telescopic groove 183 limits the telescopic ring 184 and the buffer spring 186, the clamping block 185 clamps the telescopic ring 184 in the telescopic groove 183, and the buffer spring 186 buffers the telescopic groove 183 and the telescopic ring 184. The telescopic ring 184 can accommodate the wheel hub 2 with telescopic rings 184 of different diameters. An anti-wear block 187 is provided at the other end to abut against the wheel hub 2, thereby ensuring the sealing of the oil storage chamber and preventing the anti-wear block 187 and the outer surface of the wheel hub 2 from wearing each other, and also preventing the lubricating oil from overflowing outward through the gap between the anti-wear block 187 and the wheel hub 2. When the lubricating oil is discharged outward through the oil drain hole of the bearing 3, it will be collected in the oil collecting cavity of the oil collecting sleeve, thereby effectively preventing the lubricating oil of the bearing 3 from contaminating the surface of the wheel hub 2.

[0044] Example 5

[0045] On the basis of Example 4, Figure 1-Figure 3 As shown, the oil sealing sleeve 181 is connected to the bearing 3 via two oil pipes 188 , and the two oil pipes 188 are symmetrically arranged around the axis of the oil sealing sleeve 181 , and an oil pump and a switch valve are arranged in the oil pipes 188 .

[0046] The working principle and beneficial effects of the above technical solution are as follows: when the lubricating oil in the oil storage chamber is almost full, the switch valve in the oil pipe 188 is opened, and the oil pump transports the lubricating oil in the oil storage chamber back to the bearing 3 through the oil pipe 188, thereby ensuring the lubrication of the bearing 3 during rotation and freeing up space in the oil storage chamber, thereby achieving reasonable circulation of the lubricating oil. When there is no need to transport the lubricating oil in the oil storage chamber back to the bearing 3, the oil pump and the switch valve do not work.

[0047] Example 6

[0048] On the basis of Example 5, the present invention further comprises:

[0049] The first contact force detection module is used to measure the normal contact force between a single roller and an inner raceway in the bearing 3;

[0050] The contact force detection module 2 is used to measure the normal contact force between a single roller and an outer raceway in the bearing 3;

[0051] Angle detection module 1, used to measure the contact angle between the inner roller and the inner raceway of the bearing 3;

[0052] Angle detection module 2, used to measure the contact angle between the inner roller and the outer raceway of bearing 3;

[0053] Angle detection module three, used to measure the contact angle between one side of the large end face of the inner roller of bearing 3 and the inner ring rib;

[0054] A calculation module 1 is used to calculate the contact displacement between the roller and the inner and outer raceways based on the normal contact force between a single roller and the inner raceway in the bearing 3;

[0055] An alarm module, used for issuing an alarm;

[0056] A processing module, used for comparing the contact displacement between the inner roller and the inner and outer raceways of the bearing 3 obtained by the calculation module 1 with the preset maximum contact displacement between the roller and the inner and outer raceways;

[0057] The control module controls the alarm to sound an alarm and controls the wind turbine generator set to stop and prepare for maintenance when the contact displacement between the inner roller of the bearing 3 and the inner and outer raceways is greater than the preset maximum contact displacement between the inner roller of the bearing 3 and the inner and outer raceways. The wind turbine generator set works normally when the contact displacement between the inner roller of the bearing 3 and the inner and outer raceways is less than or equal to the preset maximum contact displacement between the inner roller of the bearing 3 and the inner and outer raceways.

[0058] The working principle and beneficial effects of the above technical solution are as follows: the contact force detection module 1 measures the normal contact force between a single roller and the inner raceway in the bearing 3, the contact force detection module 2 measures the normal contact force between a single roller and the outer raceway in the bearing 3, the angle detection module 1 measures the contact angle between the inner roller and the inner raceway of the bearing 3, the angle detection module 2 measures the contact angle between the inner roller and the outer raceway of the bearing 3, the angle detection module 3 measures the contact angle between the large end face of the inner roller of the bearing 3 and the inner ring rib, the calculation module 1 calculates the contact angle between the roller and the inner and outer raceways based on the normal contact force between the single roller and the inner raceway in the bearing 3. The alarm module is used to issue an alarm. The processing module compares the contact displacement between the inner roller and the inner and outer raceways of the bearing 3 obtained by the calculation module 1 with the preset maximum contact displacement between the roller and the inner and outer raceways. When the contact displacement between the inner roller and the inner and outer raceways of the bearing 3 is greater than the preset maximum contact displacement between the inner roller and the inner and outer raceways of the bearing 3, the control module controls the alarm to issue an alarm and at the same time controls the wind turbine to stop and prepare for maintenance. When the contact displacement between the inner roller and the inner and outer raceways of the bearing 3 is less than or equal to the preset maximum contact displacement between the inner roller and the inner and outer raceways of the bearing 3, the wind turbine works normally.

[0059] Example 7

[0060] Based on Example 6, the calculation module 1 calculates based on the following formula 1:

[0061]

[0062] δ is the contact displacement between the inner roller and the inner and outer raceways of bearing 3, F 1 is the normal contact force between a single roller and the inner raceway in bearing 3, F 2 is the normal contact force between a single roller and the outer raceway in bearing 3, ω 1 is the contact angle between the inner roller and the inner raceway of bearing 3, ω 2 is the contact angle between the inner roller and the outer raceway of bearing 3, ω 3 is the contact angle between the large end face of the inner roller of bearing 3 and the inner ring rib, μ 1 is the Poisson's ratio of the inner raceway, μ 2 is the Poisson's ratio of the outer raceway, E 1 is the elastic modulus of the inner raceway, E 2 is the elastic modulus of the outer raceway, S 1 is the diameter ratio of the inner roller to the inner raceway of bearing 3, s 2 is the diameter ratio of the inner roller to the outer raceway of bearing 3, D 1 is the length of the inner roller of bearing 3, D 2 is the diameter of the inner roller of bearing 3.

[0063] The working principle and beneficial effects of the above technical solution are: The flexibility coefficient of the inner and outer raceway contact is calculated by The contact displacement between the inner roller and the inner and outer raceways of the bearing 3 is calculated. When the contact displacement between the inner roller and the inner and outer raceways of the bearing 3 is greater than the preset maximum contact displacement between the inner roller and the inner and outer raceways of the bearing 3, the control module controls the alarm to sound an alarm and controls the wind turbine to stop and prepare for maintenance. When the contact displacement between the roller and the inner and outer raceways is less than or equal to the preset maximum contact displacement between the roller and the inner and outer raceways, the wind turbine operates normally.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A land wind turbine blade structure, characterized in that: include: A blade body (1), wherein a first cavity (11) and a second cavity (12) are arranged in the blade body (1), wherein a plurality of reinforcing ribs (13) are arranged in the first cavity (11) and the second cavity (12), respectively, wherein a connecting column (14) is inserted between the upper and lower reinforcing ribs (13), wherein one end of the connecting column (14) extending out of the blade body (1) is fixedly provided with a fixing column (15), wherein one end of the fixing column (15) is fixedly connected to the blade body (1), and the other end of the fixing column (15) is transmission-connected to a hub (2) on a wind turbine generator set via a bearing (3).

2. A land wind turbine blade structure according to claim 1, characterized in that: The reinforcing rib (13) is provided with a through hole one (131), a through hole two (111) is provided on the surface of the blade body (1) at a position corresponding to the reinforcing rib (13), a through hole three (141) is provided at a position where the connecting column (14) contacts the reinforcing rib (13), and the through hole one (131), the through hole two (111), and the through hole three (141) are coaxially arranged and fixedly connected by a rotating bolt (142).

3. A land wind turbine blade structure according to claim 2, characterized in that: The outer surface of the blade body (1) is inlaid with a conductive layer (16) arranged in a mesh shape, the conductive layer (16) is flush with the outer surface of the blade body (1), the blade body (1) is provided with a plurality of square holes (17), a conductive head (171) is arranged in the square hole (17), the top of the conductive head (171) is flush with the outer surface of the blade body (1), the conductive head (171) is electrically connected to the conductive layer (16), the conductive head (171) is connected to the conductive head (173) via a conductive bolt (172), the conductive head (173) is arranged on the inner walls of the first cavity (11) and the second cavity (12), a rubber layer is arranged on the inner walls of the first cavity (11) and the second cavity (12), the plurality of conductive heads are electrically connected via a cable wire (174), and the cable wire (174) is electrically connected to the generator set.

4. A land wind turbine blade structure according to claim 1, characterized in that: The invention also comprises an oil sealing assembly (18), wherein the oil sealing assembly (18) is arranged on the bearing (3), the oil sealing assembly (18) comprises an oil sealing sleeve (181), the oil sealing sleeve (181) is sleeved on the bearing (3) and communicated with the interior of the bearing (3), the oil sealing sleeve (181) rotates synchronously with the bearing (3), an oil sealing port (182) is arranged on one side of the oil sealing sleeve (181), and the oil sealing sleeve (181), the oil sealing port (182) and the bearing (3) are connected to each other. An oil storage cavity is formed between the two ends of the wheel hub (2); a telescopic groove (183) is provided in the oil sealing port (182); a telescopic ring (184) is provided in the telescopic groove (183); clamping blocks (185) are provided on both sides of the telescopic ring (184); a buffer spring (186) is provided between one end of the telescopic ring (184) and the telescopic groove (183); an anti-wear block (187) is provided at the other end of the telescopic ring (184); and the anti-wear block (187) abuts against the outer surface of the wheel hub (2).

5. A land wind turbine blade structure according to claim 4, characterized in that: The oil sealing sleeve (181) and the bearing (3) are connected via two oil pipes (188). The two oil pipes (188) are symmetrically arranged around the axis of the oil sealing sleeve (181). An oil pump and a switch valve are arranged in the oil pipes (188).

6. A land wind turbine blade structure according to claim 5, characterized in that: Also includes: A contact force detection module 1, used for measuring the normal contact force between a single roller and an inner raceway in a bearing (3); A second contact force detection module is used to measure the normal contact force between a single roller and an outer raceway in the bearing (3); Angle detection module 1, used to measure the contact angle between the inner roller and the inner raceway of the bearing (3); Angle detection module 2, used for measuring the contact angle between the inner roller and the outer raceway of the bearing (3); Angle detection module three, used for measuring the contact angle between one side of the large end face of the inner roller of the bearing (3) and the inner ring rib; A calculation module 1 is used to calculate the contact displacement between the roller and the inner and outer raceways based on the normal contact force between a single roller and the inner raceway in the bearing (3); An alarm module, used for issuing an alarm; A processing module, used for comparing the contact displacement between the inner roller and the inner and outer raceways of the bearing (3) obtained by the calculation module 1 with the preset maximum contact displacement between the roller and the inner and outer raceways; The control module controls the alarm device to sound an alarm and simultaneously controls the wind turbine generator set to stop and prepare for maintenance when the contact displacement between the inner roller of the bearing (3) and the inner and outer raceways is greater than the preset maximum contact displacement between the inner roller of the bearing (3) and the inner and outer raceways. The wind turbine generator set operates normally when the contact displacement between the inner roller of the bearing (3) and the inner and outer raceways is less than or equal to the preset maximum contact displacement between the inner roller of the bearing (3) and the inner and outer raceways.

7. A land wind turbine blade structure according to claim 6, characterized in that: The calculation module 1 calculates based on the following formula 1: δ is the contact displacement between the inner roller and the inner and outer raceways of the bearing (3), F1 is the normal contact force between the single roller and the inner raceway of the bearing (3), F2 is the normal contact force between the single roller and the outer raceway of the bearing (3), ω1 is the contact angle between the inner roller and the inner raceway of the bearing (3), ω2 is the contact angle between the inner roller and the outer raceway of the bearing (3), ω3 is the contact angle between the large end face of the inner roller of the bearing (3) and the inner ring rib, μ1 is the Poisson's ratio of the inner raceway, μ2 is the Poisson's ratio of the outer raceway, E1 is the elastic modulus of the inner raceway, E2 is the elastic modulus of the outer raceway, S1 is the diameter ratio of the inner roller and the inner raceway of the bearing (3), S2 is the diameter ratio of the inner roller and the outer raceway of the bearing (3), D1 is the length of the inner roller of the bearing (3), and D2 is the diameter of the inner roller of the bearing (3).

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