Cable twisting protection device and method for yaw system of wind generating set

Abstract

The invention relates to the technical field of wind driven generators, and discloses a wind generating set yaw system twisted cable protection device and method.The device comprises a tower barrel and a twisted cable and further comprises supporting frames fixed to the two sides of the tower barrel, and limiting frames are fixedly connected between the opposite sides of the two supporting frames correspondingly; connecting plates are arranged between the opposite sides of the two limiting frames correspondingly, fixing plates are fixedly connected to the front side and the rear side of one side of each connecting plate correspondingly, and dampers are fixedly connected between the opposite sides of the two fixing plates correspondingly. Limiting holes in positioning rings penetrate into an annular protection shell, when a twisted cable shakes slightly, the twisted cable can abut against two protection rings in the annular protection shell, the protection rings are stressed to drive limiting rods and enable the limiting rings to stretch second springs to protect the twisted cable, a certain amount of space is stored in a limiting space, and therefore the twisted cable can be protected. Therefore, the cable is ensured not to be fixed at a certain position by strong force, and damage caused by friction and torsion concentration is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generators, and in particular to a twisted cable protection device and method for a yaw system of a wind turbine generator set. Background Art

[0002] Wind turbines can convert clean and pollution-free wind energy into electrical energy. The wind energy capture device is the wind wheel. The wind wheel converts wind energy into rotational mechanical kinetic energy and transmits it to the generator through a transmission chain. The generator converts the rotational kinetic energy into electrical energy. For wind turbines with horizontal axis structures, there is a generator or nacelle behind the wind wheel. The generator of the doubly fed generator set is installed in the nacelle and connected to the wind wheel through a transmission chain. Because the wind wheel has a large diameter and in order to capture high-quality wind energy at high altitudes, the wind wheel, generator and nacelle are all installed on the top of a higher tower. The electricity generated by the generator is transmitted downward along the tower through a cable. Because the wind direction is unpredictable, in order to capture as much wind energy as possible, the wind turbine must always be aligned with the wind direction. Therefore, the wind wheel and nacelle need to rotate relative to the tower to face the wind. In this way, the cable running from the nacelle along the tower will inevitably be twisted. In order to protect the cable from being twisted off, engineers designed a torsion cable.

[0003] Since wind conditions are complex and changeable, and the unit is subject to shaking conditions, the torsion grip inside the wind turbine is suspended inside the tower and will swing with the swing of the unit. Therefore, if the torsion grip is not protected by limit position, the torsion grip will collide with other components in the tower, causing damage to the torsion grip. Existing devices for protecting the torsion grip generally limit the torsion grip, but the existing protection devices can only limit the torsion grip to allow it to float up and down, and do not have the function of buffering protection for the cables or fine-tuning the cable angle. In an environment where wind speed and wind direction fluctuate greatly, devices that lack buffering and adaptive adjustment may not be able to effectively reduce sudden pressure fluctuations, which may cause the cable to bear too large or too small a load, affecting the operation of the entire system. Protection devices without buffering function and adaptive adjustment may cause some unpredictable failures. For example, the cable may suddenly break or be damaged due to excessive twisting or tension problems when it is not properly floated and adjusted. Summary of the invention

[0004] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] The object of the present invention is to provide a twist cable protection device and method for a yaw system of a wind turbine generator set, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a twist cable protection device for a yaw system of a wind turbine generator set, comprising a tower body and a twist cable, and further comprising:

[0007] Support frames are fixed on both sides of the tower body, and the limiting frames are fixedly connected between the opposite sides of the two support frames, and connecting plates are respectively arranged between the opposite sides of the two limiting frames, and the front and rear sides of one side of the connecting plate are fixedly connected with fixing plates, and the dampers are fixedly connected between the opposite sides of the two fixing plates, and the fixing frames are fixedly connected between the opposite sides of the two dampers;

[0008] A positioning block is fixed inside the fixed frame, a positioning plate is fixedly connected between the opposite sides of the two positioning blocks, a positioning ring is fixedly connected between the opposite sides of the two positioning plates, a plurality of limiting holes are provided in the internal annular array of the positioning ring, an annular protective shell is fixedly connected to the top of the positioning ring, a buffer is arranged inside the annular protective shell, the buffer includes a protective ring, a floating member is arranged inside the limiting frame, and the floating member includes a semi-arc notch and a retaining rod.

[0009] Preferably, the top and bottom of the positioning ring are fixedly connected to extension rods, and opposite sides of the two extension rods are fixedly connected to retaining rings for assisting in limiting the torsion.

[0010] Preferably, the top and bottom of one side of the support frame are fixedly connected with reinforcement blocks, and one side of the reinforcement block is fixedly connected to the limiting frame.

[0011] Preferably, a sliding block is fixedly connected to the bottom of the fixing frame, and a sliding rail used in conjunction with the sliding block is fixedly connected to the bottom between opposite sides of the two fixing plates.

[0012] Preferably, a first spring is fixedly connected to one side of the fixing plate, and one side of the first spring is fixedly connected to the fixing frame.

[0013] Preferably, one side of the fixing plate is fixedly connected with a reinforcing rib, and one side of the reinforcing rib is fixedly connected to the connecting plate.

[0014] Preferably, the protective ring is arranged on both sides of the inside of the annular protective shell, one side of the protective ring is fixedly connected to the limiting rod, one side of the limiting rod passes through the outside of the annular protective shell and is fixedly connected to the limiting ring, and a second spring is fixedly connected between one side of the limiting ring and the annular protective shell.

[0015] Preferably, the semi-arc groove is opened on both sides inside the limit frame, the retaining rod is fixed to the front and rear sides of one side of the connecting plate, one end of the retaining rod passes through the outside of the semi-arc groove, the top and bottom of the inner cavity of the semi-arc groove are respectively slidably connected with a clamping ring for limiting the retaining rod, one side of the clamping ring is fixedly connected with a sliding rod, one end of the sliding rod away from the clamping ring passes through the outside of the semi-arc groove, a limit frame is sleeved on the surface of the sliding rod, one side of the limit frame is fixedly connected to the limit frame, and a third spring is fixedly connected between one side of the clamping ring and the limit frame.

[0016] Preferably, one end of the retaining rod away from the connecting plate is fixedly connected to a connecting ring, and one end of the sliding rod away from the clamping ring is fixedly connected to a fixing ring.

[0017] The present invention also provides a method for protecting a twisted cable of a yaw system of a wind turbine generator set, comprising the following steps:

[0018] Step a: First, the torsion grip passes through the limiting hole on the positioning ring to the inside of the annular protective shell. When the torsion grip slightly shakes, it will press against the two protective rings inside the annular protective shell. The force on the protective ring will drive the limiting rod and make the limiting ring stretch the second spring to protect the torsion grip, so that a certain amount of space is retained in the limiting space;

[0019] Step b: When the torsion swing is large, the positioning ring will be forced to drive the positioning plate, the positioning block and the fixed frame to press between the two dampers, and cooperate with the damper and the first spring to float back and forth between the fixed plate and the fixed frame, and perform buffering;

[0020] Step c: When the torsion clamp swings at a large angle, the fixing plate will drive the retaining rod to have a certain inclination angle within the inner limit band of the semi-arc groove, and cooperate with the clamping ring and the sliding rod to squeeze and buffer the third spring between the limit frames, thereby better balancing the cable force.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention firstly allows the torsion bar to pass through the limiting hole on the positioning ring to the inside of the annular protective shell. When the torsion bar shakes slightly, it will press against the two protective rings inside the annular protective shell. The protective ring will be forced to drive the limiting rod and make the limiting ring stretch the second spring to protect the torsion bar, so that a certain frame volume is preserved in the limited space. If the torsion bar shakes greatly, the positioning ring will be forced to drive the positioning plate, the positioning block and the fixed frame to press between the two dampers, and cooperate with the damper and the first spring to float back and forth between the fixed plate and the fixed frame, and perform buffering, thereby ensuring that the cable is not forcibly fixed in a certain position, reducing the damage caused by friction and torque concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods 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 A schematic diagram of the structure of a twisted cable protection device for a yaw system of a wind turbine generator set provided by the present invention;

[0025] Figure 2 A bottom-up structural schematic diagram provided by the present invention;

[0026] Figure 3 A schematic diagram of a top view structure provided by the present invention;

[0027] Figure 4 The present invention provides Figure 3 The enlarged structural diagram at A in the middle;

[0028] Figure 5 A schematic diagram of a local structure provided by the present invention;

[0029] Figure 6 A schematic diagram of a cross-sectional structure of a slide rail provided by the present invention;

[0030] Figure 7 This is a schematic diagram of the floating member structure provided by the present invention.

[0031] Description of reference numerals:

[0032] 1. Tower body; 2. Twist-on; 3. Support frame; 4. Limit frame; 5. Connecting plate; 6. Fixing plate; 7. Damper; 8. Fixing frame; 9. Positioning block; 10. Positioning plate; 11. Positioning ring; 12. Limiting hole; 13. Annular protective shell; 14. Buffer; 1401. Protective ring; 1402. Limit rod; 1403. Limiting ring; 1404. Second spring; 15. Floating member; 1501. Semi-arc notch; 1502. Retaining rod; 1503. Clamping ring; 1504. Sliding rod; 1505. Limiting frame; 1506. Third spring; 1507. Connecting ring; 1508. Fixing ring; 16. Extension rod; 17. Retaining ring; 18. Reinforcement block; 19. Sliding block; 20. Slide rail; 21. First spring; 22. Reinforcing rib. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] See also Figure 1-Figure 7 As shown, a twist cable protection device for the yaw system of a wind turbine generator set includes a tower body 1 and a twist cable 2, and also includes: support frames 3 fixed on both sides of the tower body 1, the support frame 3 is Y-shaped to improve the support strength of the limit frame 4, the limit frames 4 are fixedly connected between the opposite sides of the two support frames 3, and the limit connection plate 5 is convenient to move, and the connection plate 5 is fixed to the fixed plate 6, so that the damper 7 is convenient to fix, and the connection plates 5 are respectively arranged between the opposite sides of the two limit frames 4, and the front and rear sides of one side of the connection plate 5 are fixedly connected with the fixed plate 6, and the dampers 7 are fixedly connected between the opposite sides of the two fixed plates 6, and the dampers 7 are arranged to buffer the movement of the fixed frame 8 through the arrangement of the dampers 7, and the fixed frame 8 is fixedly connected between the opposite sides of the two dampers 7;

[0038] The positioning block 9 fixed inside the fixed frame 8 is fixed by the positioning block 9, the positioning plate 10 and the positioning ring 11, so that the positioning ring 11 can drive the fixed frame 8 to cooperate with the damper 7 for buffering and floating when shaking. The two positioning blocks 9 are respectively fixedly connected on opposite sides with the positioning plates 10, and the two positioning plates 10 are fixedly connected on opposite sides with the positioning ring 11. The internal annular array of the positioning ring 11 is provided with a plurality of limiting holes 12. The limiting holes 12 cooperate with the annular protective shell 13 to facilitate the limiting of the torsion grip 2 to prevent the torsion grip 2 from swinging greatly and causing damage to other accessories inside the tower body 1. The top of the positioning ring 11 is fixedly connected with an annular protective shell 13, and a buffer member 14 is arranged inside the annular protective shell 13. The buffer member 14 includes a protective ring 1401. A floating member 15 is arranged inside the limit frame 4. Through the setting of the floating member 15, the positioning ring 11 can be moved with a small radius, which improves the limit of the torsion grip 2 and ensures that the torsion grip 2 floats under a certain frame amount. Angle fine-tuning and floating can ensure that the cable is not forcibly fixed in a certain position, thereby reducing the damage caused by friction and torque concentration. The floating member 15 includes a semi-arc notch 1501 and a retaining rod 1502.

[0039] The top and bottom of the positioning ring 11 are fixedly connected with extension rods 16, and the extension rods 16 can cooperate with the retaining rings 17 to assist in limiting the torsion grip 2. The opposite sides of the two extension rods 16 are fixedly connected with retaining rings 17 used to assist in limiting the torsion grip 2. The top and bottom of one side of the support frame 3 are fixedly connected with reinforcement blocks 18. By fixing the reinforcement blocks 18 with the limit frame 4, the connection strength between the support frame 3 and the fixed frame 8 can be improved. One side of the reinforcement block 18 is fixedly connected to the limit frame 4, and the bottom of the fixed frame 8 is fixedly connected with a slider 19. The bottom between the opposite sides of the two fixed plates 6 is fixedly connected with a slide rail 20 used in conjunction with the slider 19. By sliding the slider 19 and the slide rail 20, and the slide rail 20 is fixed between the two fixed plates 6, the supporting strength of the damper 7 can be reduced, so that the fixed frame 8 cooperates with the slider 19 to press and move inside the slide rail 20 to improve the strength between the fixed plate 6, the damper 7 and the fixed frame 8.

[0040] One side of the fixed plate 6 is fixedly connected with a first spring 21, and one side of the first spring 21 is fixedly connected to the fixed frame 8. By fixing the first spring 21 between the fixed plate 6 and the fixed frame 8, the frame amount buffering floating between the fixed plate 6 and the fixed frame 8 can be assisted. One side of the fixed plate 6 is fixedly connected with a reinforcing rib 22. By fixing the reinforcing rib 22 to the connecting plate 5 and the fixed plate 6, the connection strength between the fixed plate 6 and the connecting plate 5 can be improved. One side of the reinforcing rib 22 is fixedly connected to the connecting plate 5.

[0041] The protective rings 1401 are arranged on both sides of the annular protective shell 13, and one side of the protective ring 1401 is fixedly connected to the limiting rod 1402. One side of the limiting rod 1402 penetrates to the outside of the annular protective shell 13 and is fixedly connected to the limiting ring 1403. The two protective rings 1401 are arranged inside the annular protective shell 13. When the torsion arm 2 shakes, the protective ring 1401 will be pressed. At this time, the protective ring 1401 will be forced to drive the limiting rod 1402 and the limiting ring 1403 to stretch the second spring 1404 for buffering and protecting the torsion arm 2. The second spring 1404 is fixedly connected between one side of the limiting ring 1403 and the annular protective shell 13.

[0042] The semi-arc slot 1501 is provided on both sides of the limiting frame 4, the retaining rod 1502 is fixed to the front and rear sides of one side of the connecting plate 5, one end of the retaining rod 1502 passes through the outside of the semi-arc slot 1501, and the top and bottom of the inner cavity of the semi-arc slot 1501 are respectively slidably connected with a clamping ring 1503 for limiting the retaining rod 1502, and one side of the clamping ring 1503 is fixedly connected with a sliding rod 1504, and the end of the sliding rod 1504 away from the clamping ring 1503 passes through the outside of the semi-arc slot 1501. When the torsion arm 2 swings at a large angle, the fixing plate 6 will drive the retaining rod 1502 inside the semi-arc slot 1501 with a certain inclination angle, and cooperate with the clamping ring 1503 and the sliding rod 1504 to make the third spring 1506 is squeezed and buffered between the limit frames 1505, so as to better balance the force on the cable. The surface of the slide bar 1504 is sleeved with a limit frame 1505, one side of the limit frame 1505 is fixedly connected to the limit frame 4, and a third spring 1506 is fixedly connected between one side of the retaining ring 1503 and the limit frame 1505. The end of the retaining rod 1502 away from the connecting plate 5 is fixedly connected with a connecting ring 1507, and the connecting ring 1507 is fixed to the retaining rod 1502 to limit one end of the retaining rod 1502. The end of the slide bar 1504 away from the retaining ring 1503 is fixedly connected with a fixing ring 1508, and the fixing ring 1508 is fixed to one end of the slide bar 1504 to limit one end of the slide bar 1504.

[0043] The present invention also provides a method for protecting a twisted cable of a yaw system of a wind turbine generator set, comprising the following steps:

[0044] Step a: First, the twisting arm 2 passes through the limiting hole 12 on the positioning ring 11 to the inside of the annular protective shell 13. When the twisting arm 2 shakes slightly, it will press the two protective rings 1401 inside the annular protective shell 13. The protective rings 1401 are subjected to force, which will drive the limiting rod 1402 and make the limiting ring 1403 stretch the second spring 1404 to protect the twisting arm 2, so that the limiting space retains a certain amount of space;

[0045] Step b: When the torsion arm 2 shakes with a large amplitude, the positioning ring 11 will be forced to drive the positioning plate 10, the positioning block 9 and the fixing frame 8 to press between the two dampers 7, and cooperate with the damper 7 and the first spring 21 to float back and forth between the fixing plate 6 and the fixing frame 8, and perform buffering;

[0046] Step c: When the torsion clamp 2 swings at a larger angle, the fixing plate 6 will drive the retaining rod 1502 to have a certain inclination angle within the inner limit band of the semi-arc groove 1501, and cooperate with the clamping ring 1503 and the sliding rod 1504 to squeeze and buffer the third spring 1506 between the limit frames 1505, so as to better balance the force on the cable.

[0047] Working principle: First, when the torsion grip 2 passes through the limiting hole 12 on the positioning ring 11 to the inside of the annular protective shell 13, and at the same time passes through the retaining ring 17, when the torsion grip 2 shakes, it will first press the protective ring 1401. At this time, the protective ring 1401 will be forced to drive the limiting rod 1402 and the limiting ring 1403 to stretch the second spring 1404 for buffering and protection of the torsion grip 2. If the front and rear shaking amplitude is large, the positioning ring 11 will be forced to drive the positioning plate 10 and the positioning block 9 and the fixed frame 8 to press between the two dampers 7, and when the fixed frame 8 moves, it will drive the slider 19 to move within the internal limit of the slide rail 20, and cooperate with the damper 7 and the first spring 21 to squeeze between the fixed plate 6 and the fixed frame 8. Pressure buffering, through the buffering effect, can make the cable tension more stable, thereby reducing the risk of cable damage, and extending the service life of the cable and equipment. If the torsion grip 2 shakes a large amplitude, the fixing plate 6 will drive the retaining rod 1502 to move up and down with a certain inclination angle inside the semi-arc groove 1501, and cooperate with the clamping ring 1503 and the sliding rod 1504 to make the third spring 1506 squeezed between the limit frame 1505 and squeeze the retaining rod 1502. Buffering, so as to better balance the cable force, so that the torsion grip 2 is within a limited range, to ensure a certain amplitude frame, through angle fine-tuning and floating, it can ensure that the cable is not forcibly fixed in a certain position, thereby reducing friction and damage caused by torque concentration.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A twist cable protection device for a yaw system of a wind turbine generator set, comprising a tower body (1) and a twist cable (2), characterized in that: Also includes: Support frames (3) are fixed on both sides of the tower body (1), and limiting frames (4) are fixedly connected between opposite sides of the two support frames (3), and connecting plates (5) are provided between opposite sides of the two limiting frames (4), and fixing plates (6) are fixedly connected to the front and rear sides of one side of the connecting plate (5), and dampers (7) are fixedly connected between opposite sides of the two fixing plates (6), and fixing frames (8) are fixedly connected between opposite sides of the two dampers (7); A positioning block (9) is fixed inside the fixed frame (8), and a positioning plate (10) is fixedly connected between the opposite sides of the two positioning blocks (9), and a positioning ring (11) is fixedly connected between the opposite sides of the two positioning plates (10). The internal annular array of the positioning ring (11) is provided with a plurality of limiting holes (12). The top of the positioning ring (11) is fixedly connected with an annular protective shell (13), and a buffer member (14) is arranged inside the annular protective shell (13), and the buffer member (14) includes a protective ring (1401). A floating member (15) is arranged inside the limiting frame (4), and the floating member (15) includes a semi-arc notch (1501) and a retaining rod (1502).

2. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: The top and bottom of the positioning ring (11) are fixedly connected to extension rods (16), and opposite sides of the two extension rods (16) are fixedly connected to retaining rings (17) for assisting the limiting twisting grip (2).

3. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: The top and bottom of one side of the support frame (3) are both fixedly connected with a reinforcement block (18), and one side of the reinforcement block (18) is fixedly connected to the limiting frame (4).

4. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: A slider (19) is fixedly connected to the bottom of the fixed frame (8), and a slide rail (20) used in conjunction with the slider (19) is fixedly connected to the bottom between opposite sides of the two fixed plates (6).

5. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: A first spring (21) is fixedly connected to one side of the fixing plate (6), and one side of the first spring (21) is fixedly connected to the fixing frame (8).

6. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: One side of the fixing plate (6) is fixedly connected to a reinforcing rib (22), and one side of the reinforcing rib (22) is fixedly connected to the connecting plate (5).

7. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 1, characterized in that: The protective ring (1401) is arranged on both sides of the inside of the annular protective shell (13); one side of the protective ring (1401) is fixedly connected to a limiting rod (1402); one side of the limiting rod (1402) passes through the outside of the annular protective shell (13) and is fixedly connected to a limiting ring (1403); a second spring (1404) is fixedly connected between one side of the limiting ring (1403) and the annular protective shell (13).

8. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 7, characterized in that: The semi-arc-shaped notch (1501) is provided on both sides of the interior of the limiting frame (4); the retaining rod (1502) is fixed to the front and rear sides of one side of the connecting plate (5); one end of the retaining rod (1502) passes through the outside of the semi-arc-shaped notch (1501); the top and bottom of the inner cavity of the semi-arc-shaped notch (1501) are respectively slidably connected with a clamping ring (1503) used for limiting the retaining rod (1502); the clamping ring (1503) A sliding rod (1504) is fixedly connected to one side of the retaining ring (1503), and one end of the sliding rod (1504) away from the retaining ring (1503) passes through the outer side of the semi-arc groove (1501). A limiting frame (1505) is sleeved on the surface of the sliding rod (1504), and one side of the limiting frame (1505) is fixedly connected to the limiting frame (4). A third spring (1506) is fixedly connected between one side of the retaining ring (1503) and the limiting frame (1505).

9. A twist cable protection device for a yaw system of a wind turbine generator set according to claim 8, characterized in that: One end of the retaining rod (1502) away from the connecting plate (5) is fixedly connected to a connecting ring (1507), and one end of the sliding rod (1504) away from the clamping ring (1503) is fixedly connected to a fixing ring (1508).

10. A method for the twist cable protection device for the yaw system of a wind turbine generator set as claimed in claim 8 or 9, characterized in that: The following steps are involved: Step a: First, the twisting handle (2) passes through the limiting hole (12) on the positioning ring (11) and penetrates into the inside of the annular protective shell (13). When the twisting handle (2) shakes slightly, it presses against the two protective rings (1401) inside the annular protective shell (13). The protective rings (1401) are subjected to force, which drives the limiting rod (1402) and causes the limiting ring (1403) to stretch the second spring (1404) to protect the twisting handle (2), so that the limiting space retains a certain amount of space. Step b: When the torsion grip (2) shakes to a large extent, the positioning ring (11) will be forced to drive the positioning plate (10) and the positioning block (9) and the fixed frame (8) to press between the two dampers (7), and cooperate with the damper (7) and the first spring (21) to float back and forth between the fixed plate (6) and the fixed frame (8) to provide buffering; Step c: When the torsion bar 2 swings at a larger angle, the fixing plate (6) will drive the retaining rod (1502) to have a certain inclination angle within the inner limit band of the semi-arc groove (1501), and cooperate with the clamping ring (1503) and the sliding rod (1504) to squeeze and buffer the third spring (1506) between the limit frames (1505), thereby better balancing the force on the cable.

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