Wind turbine maintenance clamp

Abstract

The present invention discloses a wind turbine maintenance clamp, characterized in that it includes a clamp bracket with a clamp opening, the clamp bracket being connected to an openable and closable clamp bracket; the clamp bracket and the clamp bracket are respectively provided with a short half-circle elastic clamp and a long half-circle elastic clamp; the short half-circle elastic clamp cooperates with the long half-circle elastic clamp to encircle the object to be encircled, and forms an equivalent circle encircling the object to be encircled; the short half-circle action mechanism changes the length and curvature of the short half-circle elastic clamp, and the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp, thereby changing the roundness and diameter of the equivalent circle, so that the short half-circle elastic clamp and the long half-circle elastic clamp can always encircle and cling to the outer surface of the object to be encircled. The present invention can be used in conjunction with a conical structure and can be adjusted to accommodate structures with varying clamp diameters.

Description

Technical Field

[0001] The invention relates to a clamp structure, which is particularly suitable for repairing a wind power tower. Background Art

[0002] The offshore wind power industry has become a hot commodity in the power industry. Unlike onshore wind power, offshore wind power operates under complex conditions. Wind turbines are subject to the harsh marine environment, which accelerates the failure of vulnerable parts such as bolts. Mechanical and electrical system failure rates increase significantly, leading to increased frequency of maintenance and overhauls.

[0003] Because wind turbines are installed offshore, the high cost of transporting them to land for repairs makes them impossible. Therefore, they must be repaired offshore. During offshore repairs, a maintenance crane can be secured to the wind turbine tower using a clamp. However, wind turbine towers are typically not cylindrical but rather conical, wider at the bottom and narrower at the top. Consequently, clamps with varying roundness are required at different locations on the wind turbine tower, making it difficult to secure the maintenance crane. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing clamp structure cannot adapt to the objects to be clamped with inconsistent upper and lower diameters.

[0005] In order to solve the above technical problems, the technical solution of the present invention is to provide a wind turbine maintenance clamp, which is characterized in that it includes a clamp bracket with a clamp opening, the clamp bracket is connected to an openable and closable clamp bracket, when the clamp bracket is opened, the clamp opening is exposed to the outside, and the wind turbine maintenance clamp is in an open state; when the clamp bracket is closed, the clamp opening is sealed, and the wind turbine maintenance clamp is in a closed state;

[0006] A short half-circle elastic clamp and a long half-circle elastic clamp are respectively provided on the clamp bracket and the clamp support; when the wind turbine maintenance clamp is in a closed state, the short half-circle elastic clamp cooperates with the long half-circle elastic clamp to encircle the object to be encircled, and form an equivalent circle encircling the object to be encircled; the short half-circle elastic clamp is changed by the short half-circle action mechanism, and the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp, thereby changing the roundness and diameter of the equivalent circle, so that the short half-circle elastic clamp and the long half-circle elastic clamp can always encircle and fit tightly against the outer surface of the object to be encircled.

[0007] Preferably, when the short half-circle elastic hoop and the long half-circle elastic hoop are in a free state, the roundness of the equivalent circle is the maximum designed roundness.

[0008] Preferably, the short half-circle action mechanism includes a tightening cylinder, the cylinder body of the tightening cylinder is fixed on the clamp bracket, the telescopic end is fixedly connected to the guide frame, and the guide frame is pushed forward and backward by the tightening cylinder; one end of the two struts is hinged to the guide frame, and the other end is respectively connected to the two ends of the short half-circle elastic clamp. When the tightening cylinder pushes the guide frame forward, the guide frame drives the short half-circle elastic clamp to extend through the strut and changes the curvature of the short half-circle elastic clamp; when the tightening cylinder pulls the guide frame backward, the guide frame drives the short half-circle elastic clamp to shorten through the strut and changes the curvature of the short half-circle elastic clamp.

[0009] Preferably, a tightening cylinder is provided on the left and right sides of the guide frame, and a linear displacement mechanism is provided on the side of each tightening cylinder. The linear displacement mechanism is fixed on the clamp bracket and connected and fixed to the guide frame, and the linear displacement mechanism ensures that the guide frame maintains linear movement in the front and rear directions.

[0010] Preferably, the long half-circle elastic clamp is located on the inner side of the clamp bracket, and the long half-circle elastic clamp is connected and fixed to the clamp bracket through a telescopic support rod; when the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp, the telescopic support rod is extended or shortened accordingly to ensure that the long half-circle elastic clamp is always connected and fixed to the clamp bracket.

[0011] Preferably, the half-circle action mechanism includes a tensioning cylinder 1 and a tensioning cylinder 2, and the tensioning cylinder 1 and the tensioning cylinder 2 are arranged on the left and right sides of the clamp bracket, and the cylinder body is hinged to the clamp bracket; one end of the half-circle elastic clamp is detachably connected to the telescopic end of the tensioning cylinder 1 through a hook structure, and the other end of the half-circle elastic clamp is connected to the telescopic end of the tensioning cylinder 2; the length and curvature of the half-circle elastic clamp are changed by the tensioning cylinder 1 and the tensioning cylinder 2.

[0012] Preferably, the long half-turn action mechanism further includes a return spring, the two ends of which are respectively connected and fixed to the cylinder body of the tensioning oil cylinder 1 or the tensioning oil cylinder 2 and the clamp bracket; the return spring limits the swing amplitude of the tensioning oil cylinder 1 or the tensioning oil cylinder 2 and causes the return spring to generate a restoring force, so that the tensioning oil cylinder 1 or the tensioning oil cylinder 2 can be quickly reset after swinging;

[0013] A stopper is provided beside the cylinder body of the tensioning oil cylinder 1, and the limit position of the swing of the tensioning oil cylinder 1 is limited by the stopper.

[0014] Preferably, the hook structure includes a draw hook, a rotating shaft is provided at the telescopic end of the tensioning oil cylinder 1, and the draw hook is sleeved on the rotating shaft through a torsion spring so that the draw hook can rotate around the rotating shaft; the end of the long semi-circular elastic clamp is provided with a clamp shaft pin that can be hooked by the draw hook; a top block is fixed on the draw hook 7, and the top block cooperates with a stop pin fixed on the clamp bracket to enable the draw hook to rotate;

[0015] When it is necessary to combine the end of the half-circle elastic clamp with the telescopic end of the tensioning cylinder, the tensioning cylinder is extended until the top block is against the stop pin, and then the tensioning cylinder continues to extend a slight amount Δ, so that the top block drives the hook to rotate an angle α; the tensioning cylinder contracts a slight amount Δ, and the hook rotates back after an angle α to hook the clamp shaft pin; when it is necessary to separate the end of the half-circle elastic clamp from the telescopic end of the tensioning cylinder, the tensioning cylinder is extended a slight amount Δ, so that the top block drives the hook to rotate an angle α, and then the clamp bracket is opened, thereby separating the end of the half-circle elastic clamp from the telescopic end of the tensioning cylinder.

[0016] Preferably, the short half-circle elastic clamp has the same structural form as the long half-circle elastic clamp, including a plurality of clamp blocks connected in series by a steel wire rope, each clamp block including a horizontal part and vertical parts at both ends of the horizontal part, the vertical parts of two adjacent clamp blocks are close to each other, and the steel wire rope passes through the vertical parts to connect the clamp blocks in series; the two adjacent clamp blocks are locked to each other by an elastic locking mechanism, and the elastic locking mechanism is passed through the vertical parts of the clamp blocks; after the steel wire rope is pulled by tensioning cylinder one and tensioning cylinder two or by tensioning cylinder, the elastic locking mechanism is used to form a gap δ between the vertical parts of the two adjacent clamp blocks, and the gap δ changes under the action of tensioning cylinder one and tensioning cylinder two or tensioning cylinder, thereby achieving the purpose of changing the length and curvature of the long half-circle elastic clamp or the short half-circle elastic clamp.

[0017] Preferably, the elastic locking mechanism includes a bolt, a spherical washer, a spring and a nut; the bolt is passed through the vertical parts of two adjacent clamping blocks and is locked by the nut; a spherical washer and a spring are provided on the outer sleeve of the bolt, and the spherical washer is tightly attached to the vertical part of the clamping block; the spring is located between the spherical washer and the nut, and the two ends of the spring are respectively against the spherical washer and the nut;

[0018] After the wire rope is pulled by tensioning cylinder 1 and tensioning cylinder 2 or by tensioning cylinder 1, the spring is compressed, thereby forming the gap δ between the vertical parts of the two adjacent clamp blocks; when the external force F acting on the wire rope by tensioning cylinder 1 and tensioning cylinder 2 or tensioning cylinder 1 is removed, the spring is reset, the gap δ disappears, and the roundness of the equivalent full circle reaches the maximum design roundness.

[0019] The present invention can be used with conical structures and can be adjusted to accommodate variations in clamp diameter. Compared to existing technologies, this eliminates the need for designing clamps of varying sizes for structures with varying diameters and offers enhanced safety and stability. Field trials have demonstrated significant effectiveness, allowing for adaptability to projects of varying sizes. It offers advantages such as versatility, cost-effectiveness, and ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a wind turbine maintenance clamp provided by the present invention in an open state;

[0021] Figure 2 A schematic diagram of a wind turbine maintenance clamp in a closed state provided by the present invention in a free state;

[0022] Figure 3 A schematic diagram of a wind turbine maintenance clamp in a closed state provided by the present invention;

[0023] Figure 4 Schematic diagram of the return spring.

[0024] Figure 5 for Figure 2 A partial enlarged schematic diagram of part A;

[0025] Figure 6 It is a structural diagram of the clamp fixing device;

[0026] Figure 7 for Figure 2 A partial enlarged schematic diagram of part B;

[0027] Figure 8 for Figure 7 AA section view in the figure;

[0028] Figure 9 This is a schematic diagram of the structure of a half-circle elastic clamp after being subjected to tension;

[0029] Figure 10 It is the structural form of the clamp block in the long half-circle elastic clamp;

[0030] Figure 11 It is the structural form of the clamp block in the short half-circle elastic clamp;

[0031] Figure 12A This is the left view of the guide for the clamp bracket. Figure 12B This is the main view of the guide for the clamp bracket;

[0032] Figure 13 It is a structural diagram of the clamp fixing device. DETAILED DESCRIPTION

[0033] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0034] like Figure 1 、 Figure 2 and Figure 3 As shown, a wind turbine repair clamp disclosed in the present invention includes a clamp bracket 1 with a clamp opening. The clamp bracket 1 is designed with a mounting hole, through which the wind turbine repair clamp provided by the present invention can be installed and fixed on a maintenance crane.

[0035] The clamp bracket 1 is connected to an openable and closable clamp bracket 12, which is driven to open and close by an opening and closing cylinder 13. When the clamp bracket 12 is open, the clamp opening is exposed, and the wind turbine maintenance clamp provided by the present invention is in the open state; when the clamp bracket 12 is closed, the clamp opening is sealed, and the wind turbine maintenance clamp provided by the present invention is in the closed state.

[0036] A short half-circle elastic clamp 9 and a long half-circle elastic clamp 10 are respectively provided on the clamp bracket 1 and the clamp support 12. When the wind turbine maintenance clamp is in a closed state, the short half-circle elastic clamp 9 cooperates with the long half-circle elastic clamp 10 to encircle the object to be encircled, and forms an equivalent circle that encircles the object to be encircled. The short half-circle action mechanism changes the length and curvature of the short half-circle elastic clamp 9, and the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp 10, thereby changing the roundness and diameter of the equivalent circle, so that the short half-circle elastic clamp 9 and the long half-circle elastic clamp 10 can always encircle and adhere tightly to the outer surface of the object to be encircled. When the short half-circle elastic clamp 9 and the long half-circle elastic clamp 10 are in a free state, the roundness of the equivalent circle is the maximum design roundness.

[0037] In this embodiment, the short half-turn action mechanism includes a tightening cylinder 2, the cylinder body of the tightening cylinder 2 is fixed on the clamp bracket 1, and the telescopic end is fixedly connected to the guide frame 4. In this embodiment, a tightening cylinder 2 is provided on each of the left and right sides of the guide frame 4. A linear displacement mechanism 25 is provided on the side of each tightening cylinder 2, and the linear displacement mechanism 25 is fixed on the clamp bracket 1 and is fixedly connected to the guide frame 4. The guide frame 4 is pushed forward and backward by the tightening cylinder 2, and the linear displacement mechanism 25 ensures that the guide frame 4 maintains linear movement in the forward and backward directions. One end of the two support rods 24 is hinged to the guide frame 4, and the other end is respectively connected to the two ends of the short half-turn elastic clamp 9. When the tightening cylinder 2 pushes the guide frame 4 to move forward, the guide frame 4 drives the short half-circle elastic clamp 9 to extend through the support rod 24 and changes the curvature of the short half-circle elastic clamp 9; when the tightening cylinder 2 pulls the guide frame 4 to move backward, the guide frame 4 drives the short half-circle elastic clamp 9 to shorten through the support rod 24 and changes the curvature of the short half-circle elastic clamp 9.

[0038] The long half-circle elastic clamp 10 is located inside the clamp bracket 12. The long half-circle elastic clamp 10 is connected to the clamp bracket 12 via a telescopic support rod 11. When the long half-circle actuation mechanism changes the length and curvature of the long half-circle elastic clamp 10, the telescopic support rod 11 extends or contracts accordingly, ensuring that the long half-circle elastic clamp 10 remains connected to the clamp bracket 12. In this embodiment, the telescopic support rod 11 is located at the center of the long half-circle elastic clamp 10.

[0039] The long half-circle action mechanism includes a tensioning oil cylinder 1 3-1 and a tensioning oil cylinder 2 3-2. The tensioning oil cylinder 1 3-1 and the tensioning oil cylinder 2 3-2 are arranged on the left and right sides of the clamp bracket 1, and the cylinder body thereof is hinged to the clamp bracket 1. One end of the long half-circle elastic clamp 10 is detachably connected to the telescopic end of the tensioning oil cylinder 1 3-1 through a hook structure, and the other end of the long half-circle elastic clamp 10 is connected to the telescopic end of the tensioning oil cylinder 2 3-2. The length and curvature of the long half-circle elastic clamp 10 are changed by the tensioning oil cylinder 1 3-1 and the tensioning oil cylinder 2 3-2. The tensioning oil cylinder 1 3-1 and the tensioning oil cylinder 2 3-2 will swing left and right during the action, and a return tension spring 5 is provided for this purpose. Combined with Figure 4 The two ends of the return spring 5 are respectively connected and fixed to the cylinder body of the tensioning oil cylinder 1 3-1 or the tensioning oil cylinder 2 3-2 and the hoop bracket 1. Figure 4 As shown, in this embodiment, the end of the return spring 5 is secured by a spring retainer 26 mounted on the clamp bracket 1. This spring limits the swing amplitude of the tensioning cylinder 1 3-1 or the tensioning cylinder 2 3-2 and generates a restoring force, enabling the tensioning cylinder 1 3-1 or the tensioning cylinder 2 3-2 to quickly return to its original position after swinging. A stopper 6 is provided next to the cylinder body of the tensioning cylinder 1 3-1 to define the extreme swing position of the tensioning cylinder 1 3-1.

[0040] Combine Figure 5The hook structure includes a hook 7. The telescopic end of the tensioning cylinder 3-1 is provided with a rotating shaft. The hook 7 is mounted on the rotating shaft via a torsion spring 22, allowing the hook 7 to rotate about the rotating shaft. The end of the long half-circle elastic clamp 10 is provided with a clamp shaft pin 23 that can be hooked by the hook 7. A top block 27 is fixed to the hook 7. The top block 27 cooperates with the stop pin 21 fixed to the clamp bracket 1 to enable the hook 7 to rotate. When it is necessary to connect the end of the long half-circle elastic clamp 10 to the telescopic end of the tensioning cylinder 3-1, the tensioning cylinder 3-1 is extended until the top block 27 and the stop pin 21 are abutted. The tensioning cylinder 3-1 then continues to extend a slight amount Δ, causing the top block 27 to drive the hook 7 to rotate by an angle α. The tensioning cylinder 3-1 contracts a slight amount Δ, and the hook 7 rotates back by an angle α and hooks the clamp shaft pin 23. When it is necessary to separate the end of the half-circle elastic clamp 10 from the telescopic end of the tensioning cylinder 3-1, the tensioning cylinder 3-1 is extended by a slight amount Δ, so that the top block 25 drives the hook 7 to rotate by an angle α, and then the clamp bracket 12 is opened, thereby separating the end of the half-circle elastic clamp 10 from the telescopic end of the tensioning cylinder 3-1.

[0041] Combine Figure 6 The ends of the half-circle elastic clamp 10 are connected to the clamp bracket 12 via a clamp fixture 8 that can be loosened and clamped. The clamp fixture 8 includes a cylinder 8-1 and a rotating pressure plate 8-2. When the clamping position is reached, the cylinder 8-1 causes the rotating pressure plate 8-2 to rotate 180 degrees, thereby locking the half-circle elastic clamp 10. When the clamp bracket 12 is loosened, the cylinder 8-1 opens, and the rotating pressure plate 8-2 returns to its original position, thereby opening the clamp. When the clamp bracket 12 opens, the ends of the half-circle elastic clamp 10 separate from the telescopic end of the tensioning cylinder 3-1. At this time, the ends of the half-circle elastic clamp 10 are clamped by the clamp fixture 8. When the clamp bracket 12 is closed, the ends of the half-circle elastic clamp 10 engage with the telescopic end of the tensioning cylinder 3-1. At this time, the clamp fixture 8 releases the ends of the half-circle elastic clamp 10.

[0042] Combine Figure 7 、 Figure 8 as well as Figure 9 The short half-circle elastic clamp 9 has the same structure as the long half-circle elastic clamp 10, including multiple clamp blocks 14 connected in series by a steel wire rope 15. Figure 10 and Figure 11As shown, the short half-circle elastic clamp 9 and the long half-circle elastic clamp 10 have clamp blocks 14 facing opposite directions. Each clamp block 14 comprises a horizontal portion 14-1 and vertical portions 14-2 at either end of the horizontal portion 14-1. The vertical portions 14-2 of two adjacent clamp blocks 14 are positioned against each other, and a steel wire rope 15 passes through the vertical portions 14-2, connecting the clamp blocks 14 in series. Furthermore, the two adjacent clamp blocks 14 are locked together by an elastic locking mechanism, which is installed on the vertical portions 14-2 of the clamp blocks 14. After the steel wire rope 15 is pulled by tensioning cylinder 1 3-1 and tensioning cylinder 2 3-2 or by jacking cylinder 2, a gap δ is formed between the vertical portions 14-2 of two adjacent clamp blocks 4-14 by means of an elastic locking mechanism, and the gap δ changes under the action of tensioning cylinder 1 3-1 and tensioning cylinder 2 3-2 or jacking cylinder 2, thereby achieving the purpose of changing the length and curvature of the long half-circle elastic clamp 10 or the short half-circle elastic clamp 9.

[0043] A rubber 16 is provided on the side of each clamping hoop block 14 facing the object being clamped, and the rubber 16 is used to increase the friction between the short half-circle elastic clamping hoop 9 or the long half-circle elastic clamping hoop 10 and the object being clamped.

[0044] like Figure 10 and Figure 11 As shown, in this embodiment, the elastic locking mechanism includes a bolt 17, a spherical washer 18, a spring 19, and a nut 20. The bolt 17 is inserted into the vertical portion 14-2 of two adjacent clamping blocks 14 and is locked by the nut 20. A spherical washer 18 and a spring 19 are provided on the outer sleeve of the bolt 17. The spherical washer 18 is tightly attached to the vertical portion 14-2 of the clamping block 14. The spring 19 is located between the spherical washer 18 and the nut 20. The two ends of the spring 19 are respectively against the spherical washer 18 and the nut 20. After the wire rope 15 is pulled by the tensioning cylinder 1 3-1 and the tensioning cylinder 2 3-2 or by the tensioning cylinder 2, the spring 19 is compressed, thereby forming the aforementioned gap δ between the vertical portions 14-2 of the two adjacent clamping blocks 4-14. When the external force F acting on the wire rope 15 by the tensioning cylinder 1 3 - 1 and the tensioning cylinder 2 3 - 2 or the jacking cylinder 2 is removed, the spring 19 is reset, the gap δ disappears, and the roundness of the equivalent full circle reaches the maximum design roundness.

[0045] When starting to work, give the opening and closing oil cylinder 13 a working signal and enter the working state. Figure 1 As shown. The hoop bracket 12 gradually approaches the hoop support 1 under the action of the opening and closing cylinder 13. Since the hoop bracket 12 has its own weight, in order to ensure that the hoop bracket 12 can be connected to the hoop support 1 on the same horizontal plane, an inclined guide is used at the connection between the two, as shown in FIG. Figure 11As shown, the clamp bracket 12 can overcome its own weight and ensure that it is connected to the clamp bracket 1 on the same horizontal plane. After the clamp bracket 13 enters the inclined surface, the clamp fixing device 8 starts to work, tightening the long half-circle elastic clamp 10 into a taut state. Then, the tensioning cylinder 1 3-1 and the tensioning cylinder 2 3-2 start to work, and the hook 7 rotates through an angle α to hook the clamp shaft pin 23, and then the clamp structure enters the clamping state. The final state is as shown in FIG. Figure 3 shown.

Claims

1. A wind turbine maintenance clamp, characterized in that: The hoop bracket comprises a hoop opening, the hoop bracket is connected to an openable and closable hoop bracket, and when the hoop bracket is opened, the hoop opening is exposed to the outside, and the wind turbine maintenance hoop is in an open state; When the clamp bracket is closed, the clamp opening is sealed, and the wind turbine maintenance clamp is in a closed state; A short half-circle elastic clamp and a long half-circle elastic clamp are respectively provided on the clamp bracket and the clamp bracket; when the wind turbine maintenance clamp is in a closed state, the short half-circle elastic clamp cooperates with the long half-circle elastic clamp to encircle the object to be encircled, and forms an equivalent circle encircling the object to be encircled; the short half-circle action mechanism changes the length and curvature of the short half-circle elastic clamp, and the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp, thereby changing the roundness and diameter of the equivalent circle, so that the short half-circle elastic clamp and the long half-circle elastic clamp can always encircle and cling to the outer surface of the object to be encircled; The short half-turn action mechanism includes a tightening cylinder, a cylinder body of the tightening cylinder is fixed on the clamp bracket, and the telescopic end is fixedly connected to the guide frame, and the guide frame is pushed forward and backward by the tightening cylinder; one end of the two support rods is hinged to the guide frame, and the other end is respectively connected to the two ends of the short half-turn elastic clamp. When the tightening cylinder pushes the guide frame forward, the guide frame drives the short half-turn elastic clamp to extend through the support rod and changes the curvature of the short half-turn elastic clamp; when the tightening cylinder pulls the guide frame backward, the guide frame drives the short half-turn elastic clamp to shorten through the support rod and changes the curvature of the short half-turn elastic clamp.

2. A wind turbine maintenance clamp according to claim 1, characterized in that: When the short half-circle elastic hoop and the long half-circle elastic hoop are in a free state, the roundness of the equivalent circle is the maximum designed roundness.

3. A wind turbine maintenance clamp according to claim 1, characterized in that: A tightening cylinder is provided on the left and right sides of the guide frame, and a linear displacement mechanism is provided on the side of each tightening cylinder. The linear displacement mechanism is fixed on the clamp bracket and connected and fixed to the guide frame. The linear displacement mechanism ensures that the guide frame maintains linear movement in the front and rear directions.

4. A wind turbine maintenance clamp according to claim 1, characterized in that: The long half-circle elastic clamp is located on the inner side of the clamp bracket, and the long half-circle elastic clamp is connected and fixed to the clamp bracket through a telescopic support rod; when the long half-circle action mechanism changes the length and curvature of the long half-circle elastic clamp, the telescopic support rod is extended or shortened accordingly to ensure that the long half-circle elastic clamp is always connected and fixed to the clamp bracket.

5. The wind turbine maintenance clamp according to claim 1, characterized in that: The long half-circle action mechanism includes a tensioning cylinder 1 and a tensioning cylinder 2. The tensioning cylinder 1 and the tensioning cylinder 2 are arranged on the clamp bracket on the left and right, and their cylinder bodies are hinged to the clamp bracket; one end of the long half-circle elastic clamp is detachably connected to the telescopic end of the tensioning cylinder 1 through a hook structure, and the other end of the long half-circle elastic clamp is connected to the telescopic end of the tensioning cylinder 2; the length and curvature of the long half-circle elastic clamp are changed by the tensioning cylinder 1 and the tensioning cylinder 2.

6. A wind turbine maintenance clamp according to claim 5, characterized in that: The long half-turn action mechanism further includes a return spring, the two ends of which are respectively connected and fixed to the cylinder body of the tensioning oil cylinder 1 or the tensioning oil cylinder 2 and the clamp bracket; the return spring limits the swing amplitude of the tensioning oil cylinder 1 or the tensioning oil cylinder 2 and causes the return spring to generate a restoring force, so that the tensioning oil cylinder 1 or the tensioning oil cylinder 2 can be quickly reset after swinging; A stopper is provided beside the cylinder body of the tensioning oil cylinder 1, and the limit position of the swing of the tensioning oil cylinder 1 is limited by the stopper.

7. A wind turbine maintenance clamp according to claim 5, characterized in that: The hook structure includes a hook, a rotating shaft is provided at the telescopic end of the tensioning oil cylinder, and the hook is sleeved on the rotating shaft through a torsion spring so that the hook can rotate around the rotating shaft; the end of the long half-circle elastic clamp is provided with a clamp shaft pin that can be hooked by the hook; a top block is fixed on the hook, and the top block cooperates with a stop pin fixed on the clamp bracket to enable the hook to rotate; When it is necessary to combine the end of the half-circle elastic clamp with the telescopic end of the tensioning cylinder, the tensioning cylinder is extended until the top block is against the stop pin, and then the tensioning cylinder continues to extend a slight amount Δ, so that the top block drives the hook to rotate an angle α; the tensioning cylinder contracts a slight amount Δ, and the hook rotates back after an angle α to hook the clamp shaft pin; when it is necessary to separate the end of the half-circle elastic clamp from the telescopic end of the tensioning cylinder, the tensioning cylinder is extended a slight amount Δ, so that the top block drives the hook to rotate an angle α, and then the clamp bracket is opened, thereby separating the end of the half-circle elastic clamp from the telescopic end of the tensioning cylinder.

8. The wind turbine maintenance clamp according to claim 5, characterized in that: The short half-circle elastic clamp has the same structural form as the long half-circle elastic clamp, including a plurality of clamp blocks connected in series by a steel wire rope, each clamp block including a horizontal part and vertical parts at both ends of the horizontal part, the vertical parts of two adjacent clamp blocks are close to each other, and the steel wire rope passes through the vertical parts to connect the clamp blocks in series; the two adjacent clamp blocks are locked to each other by an elastic locking mechanism, and the elastic locking mechanism is passed through the vertical parts of the clamp blocks; after the steel wire rope is pulled by tensioning cylinder one and tensioning cylinder two or by tensioning cylinder, the elastic locking mechanism is used to form a gap δ between the vertical parts of the two adjacent clamp blocks, and the gap δ changes under the action of tensioning cylinder one and tensioning cylinder two or tensioning cylinder, thereby achieving the purpose of changing the length and curvature of the long half-circle elastic clamp or the short half-circle elastic clamp.

9. A wind turbine maintenance clamp according to claim 8, characterized in that: The elastic locking mechanism includes a bolt, a spherical washer, a spring, and a nut; the bolt is passed through the vertical parts of two adjacent clamping blocks and is locked by the nut; a spherical washer and a spring are provided on the outer sleeve of the bolt, and the spherical washer is tightly attached to the vertical part of the clamping block; the spring is located between the spherical washer and the nut, and the two ends of the spring are respectively against the spherical washer and the nut; After the wire rope is pulled by tensioning cylinder 1 and tensioning cylinder 2 or by tensioning cylinder 1, the spring is compressed, thereby forming the gap δ between the vertical parts of the two adjacent clamping blocks; when the external force F acting on the wire rope by tensioning cylinder 1 and tensioning cylinder 2 or tensioning cylinder 1 is removed, the spring is reset, the gap δ disappears, and the roundness of the equivalent circle reaches the maximum designed roundness.

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