Wind turbine generator blade bolt assembly convenient to take out

Abstract

The utility model belongs to the technical field of bolt assembly manufacturing, and particularly relates to a wind turbine generator blade bolt assembly convenient to take out. The wind turbine generator blade bolt assembly comprises a positioning pin, a screw body and a nut body, the screw body and the nut body are matched with each other, a blind hole with a non-circular cross section is axially formed in the end of the screw body, and a clamping part is coaxially and fixedly arranged on one end face of the nut body; a non-circular through hole is axially formed in the clamping part, the shape and size of the cross section of the through hole are the same as those of the blind hole, the shape and size of the cross section of the positioning pin are the same as those of the cross section of the blind hole, and when the nut body is arranged at one end of the screw rod body in a sleeving mode, one end of the positioning pin is inserted into the blind hole; the other end can be left in the through hole; the problems that in the process that the screw rod body needs to be taken out, the nut body and the screw rod body need to be welded together through electric welding, so that operation is complex, and the fire risk exists are solved.

Description

Technical Field

[0001] This application belongs to the technical field of bolt assembly manufacturing, and specifically relates to a bolt assembly for a wind turbine blade that is easy to remove. Background Art

[0002] During the operation of a wind power generation unit, as Figure 1 shown, problems may occur with the screw body 3 of the blade 6 of the wind power generation unit. Usually, it is necessary to remove the screw body 3 on the blade 6. However, due to the application of molybdenum disulfide or bolt locking adhesive, etc. to fix the screw body 3 in the blade 6 during the previous installation of the screw body 3 and the damage of the thread, etc., the screw body 3 cannot be normally removed from the blade 6. That is to say, during the process of removing the screw body 3, a force exceeding the normal bolt removal force needs to be applied to remove the screw body 3. Therefore, during the process of removing the screw body 3, it is necessary to use electric welding to weld the nut body 2 and the screw body 3 together, and then tools such as a wrench can be used to turn the nut body 3, so that the nut body 3 and the screw body 2 rotate together, and the welded nut body 3 and screw body 2 are removed together. However, during the process of welding the nut body 3 and the screw body 2 together by electric welding, the fan has a risk of catching fire and the operation is complex. Therefore, in order to reduce the risk of the fan catching fire and facilitate the operation of on-site personnel, it is necessary to design a bolt assembly for a wind turbine blade that is easy to remove. Summary of the Utility Model

[0003] The main purpose of this application is to address the shortcomings of the existing technology. By fixing a clampable part with a through hole on the nut body in cooperation with a positioning pin and a blind hole on the screw body, a bolt assembly for a wind turbine blade that is easy to remove is designed. Even after one end of the screw body is adhered to the blade with molybdenum disulfide or bolt locking adhesive, the nut body and the screw body can be connected together by inserting the positioning pin into the blind hole and the through hole. When the nut body rotates, the screw body will also rotate. Then, by using tools such as a wrench to rotate the nut body or the clampable part, the screw body can also be rotated, so as to screw the screw body out of the blade, solving the problems of complex operation and fire risk caused by using electric welding to weld the nut body and the screw body together during the process of removing the screw body.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] A blade bolt assembly for a wind turbine that is easy to remove, comprising a positioning pin, a screw body and a nut body that cooperate with each other. An axially arranged blind hole with a non-circular cross-section is provided at the end of the screw body. A clampable part is coaxially fixed on one end face of the nut body. A non-circular through hole is axially provided on the clampable part. The shape and size of the cross-section of the through hole are the same as those of the blind hole. The shape and size of the cross-section of the positioning pin are the same as those of the blind hole. When the nut body is sleeved on one end of the screw body, after one end of the positioning pin is inserted into the blind hole, the other end can remain in the through hole.

[0006] Preferably, the cross-section of the blind hole is a polygon with at least one depression.

[0007] Preferably, the cross-section of the blind hole is a convex polygon.

[0008] Preferably, the shape of the cross-section of the blind hole is a regular hexagon, a regular octagon or a regular quadrilateral.

[0009] Preferably, the shape and size of the outer cross-section of the clampable part are the same as those of the outer cross-section of the nut body.

[0010] Preferably, the blind hole is coaxial with the screw body, and the through hole is coaxial with the nut body.

[0011] Preferably, at least one blind hole is provided on the screw body, and at least one through hole is provided on the nut body, and the through holes and the blind holes correspond to each other one by one.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] 1. The present application adopts the method of fixedly arranging a clampable part with a through hole on the nut body to cooperate with the positioning pin and the blind hole on the screw body, and designs a blade bolt assembly for a wind turbine that is easy to remove. Even after one end of the screw body is glued in the blade by molybdenum disulfide or bolt locking glue, the nut body and the screw body can be connected together by inserting the positioning pin into the blind hole and the through hole. When the nut body rotates, the screw body will also rotate together. Then, by using a tool such as a wrench to rotate the nut body or the clampable part, the screw body can also be rotated, so as to screw out the screw body from the blade, solving the problems of complex operation and fire risk caused by welding the nut body and the screw body together with electric welding when the screw body needs to be removed.

[0014] 2. In the present application, the cross-section of the blind hole is a polygon with at least one depression, and the cross-section of the corresponding positioning pin also has at least one depression, so that when the nut body rotates, the screw body can rotate together.

[0015] 3. In the present application, through the arrangement of the blind hole, the through hole and the positioning pin, it can be ensured that when the nut body rotates, the screw body rotates together. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the installation of the screw body and the nut body on the blade;

[0017] Figure 2 It is a schematic structural diagram when only one through hole and one blind hole are provided in the present application;

[0018] Figure 3 For Figure 2 A schematic diagram after assembling the various components together;

[0019] Figure 4 For Figure 3 The sectional view of

[0020] Figure 5 It is a relationship diagram between the nut body and the grippable part in the present application;

[0021] Figure 6 It is a schematic structural diagram when two through holes and two blind holes are provided in the present application.

[0022] Wherein, 1. Positioning pin; 2. Screw body; 3. Nut body; 4. Blind hole; 5. Through hole; 6. Blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] As Figures 1-6 shown, a wind turbine blade bolt assembly convenient for removal includes a positioning pin 1, a screw body 2 and a nut body 3 which cooperate with each other. An axially arranged blind hole 4 with a non-circular cross-section is provided at the end of the screw body 2. A grippable part 7 is coaxially fixed on one end face of the nut body 3. A non-circular through hole 5 is axially provided on the grippable part 7. The shape and size of the cross-section of the through hole 5 are the same as those of the blind hole 4. The shape and size of the cross-section of the positioning pin 1 are the same as those of the cross-section of the blind hole 4. When the nut body 3 is sleeved on one end of the screw body 2, after one end of the positioning pin 1 is inserted into the blind hole 4, the other end can remain in the through hole 5.

[0024] In this embodiment, during the process of screwing out the screw body 2 outside the blade 6, the positioning pin 1 can be inserted into the blind hole after passing through the through hole 5 outside the nut body 3. Since neither the blind hole 4 nor the through hole 5 is circular, the user can use a tool such as a through-hole wrench to clamp the nut body 3 (with the central axis of the screw body 2 as the rotation axis) to rotate, so that the nut body 3 drives the screw body 2 to rotate during the rotation. Otherwise, it is not easy to clamp the screw body 2. In this way, there is no need to adopt the fire hazard and complicated procedures brought by welding the nut body 3 and the screw body 2.

[0025] As a preferred method, the cross-section of the blind hole 4 is a polygon with at least one depression. After such a setting, the cross-section of the corresponding positioning pin 1 also has at least one depression, so that after the positioning pin 1 is inserted into the blind hole 4 and the through hole 5, it can be ensured that the screw body 2 rotates together when the nut body 3 rotates.

[0026] As a preferred method, the cross-section of the blind hole 4 is a convex polygon.

[0027] As a preferred method, the shape of the cross-section of the blind hole 4 is a regular hexagon or a regular octagon or a regular quadrilateral. The regular hexagon or the regular octagon or the regular quadrilateral are all non-circular structures, so it can be ensured that the screw body 2 rotates together when the nut body 3 rotates.

[0028] As a preferred method, the shape and size of the outer cross-section of the grippable part 7 are the same as those of the outer cross-section of the nut body 3. After such a setting, when the worker uses a wrench, the wrench can also be used to clamp the grippable part 7 to rotate the nut body 3.

[0029] As a preferred method, the blind hole 4 is coaxial with the screw body 2, and the through hole 5 is coaxial with the nut body 3. In this case, setting one blind hole 4 and one through hole 5 is sufficient to ensure that the screw body 2 rotates together when the nut body 3 rotates.

[0030] As a preferred method, at least one blind hole 4 is provided on the screw body 2, at least one through hole 5 is provided on the nut body 3, and the through hole 5 corresponds to the blind hole 4 one by one. By adopting the method of setting two blind holes 4 and at least two through holes 5, several positioning pins 1 can be used more, so as to avoid the situation that the positioning pin 1 breaks due to being unable to bear the load during the process of rotating the nut body 3 to drive the screw body 2.

Claims

1. A blade bolt assembly of a wind turbine generator set that is convenient to take out, comprising a positioning pin (1), a screw rod body (2) and a nut body (3) that cooperate with each other, characterized in that, An end of the screw body (2) is axially provided with a blind hole (4) having a non-circular cross section. One end face of the nut body (3) is coaxially fixed with a clampable portion (7). The clampable portion (7) is axially provided with a non-circular through hole (5). The shape and size of the cross section of the through hole (5) are the same as those of the blind hole (4). The shape and size of the cross section of the positioning pin (1) are the same as those of the blind hole (4). When the nut body (3) is sleeved on one end of the screw body (2), after one end of the positioning pin (1) is inserted into the blind hole (4), the other end can remain in the through hole (5).

2. The blade bolt assembly of a wind turbine unit according to claim 1, wherein The cross section of the blind hole (4) is a polygon having at least one depression.

3. The blade bolt assembly of a wind turbine unit that is convenient to take out according to claim 1, characterized in that, The cross section of the blind hole (4) is a convex polygon.

4. The blade bolt assembly of a wind turbine unit according to claim 3, characterized in that, The shape of the cross section of the blind hole (4) is a regular hexagon, a regular octagon or a square.

5. A blade bolt assembly of a wind turbine that is easy to remove, as described in claim 1, characterized in that The shape and size of the outer cross section of the clampable portion (7) are the same as those of the nut body (3).

6. The blade bolt assembly of a wind turbine unit according to claim 1, wherein, The blind hole (4) is coaxial with the screw body (2), and the through hole (5) is coaxial with the nut body (3).

7. A blade bolt assembly for a wind turbine that is easy to remove, characterized in that, At least one blind hole (4) is provided on the screw body (2), at least one through hole (5) is provided on the nut body (3), and the through holes (5) correspond to the blind holes (4) one by one.

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