Anti-overload yaw unit and system

Abstract

The utility model relates to an anti-overload yaw unit and system. The anti-overload yaw unit comprises a first connecting part and a second connecting part which are arranged in a mutually rotating mode. A driving assembly is arranged between the first connecting part and the second connecting part; the driving assembly actively acts, so that the first connecting part and the second connecting part relatively rotate; the driving assembly comprises a lever arm; the lever arm is connected with a fixed fulcrum, a large arm and a small arm; the big arm adopts a driving rod piece; the small arm adopts a driven rod; the driven rod is hinged with a clamping seat piece; and when the root part of the driving rod piece is hinged to the first connecting part or the second connecting part, the clamping seat piece intermittently clamps the second connecting part or the first connecting part to act. The device is reasonable in design, compact in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to an anti-overload yaw unit and a system. Background Art

[0002] The yaw system is one of the core components of a wind turbine, enabling the nacelle to rotate according to wind direction. Currently, the yaw system mainly uses mechanical transmission, which generally adopts gear transmission.

[0003] The yaw system of a wind turbine uses a motor and a reducer coupled with a large, low-speed, heavy-loaded gear. If the gears are in a commutation process, they are prone to tooth breakage and damage to the reducer. Damage to these components will require the wind turbine to be shut down and extensively disassembled for repair and replacement.

[0004] In the previous connecting rod yaw system, although it can overcome the above-mentioned gear defects, it still has the problem that the yaw drive needs to be aligned and the bearing diameter is small, which cannot effectively support yaw. Utility Model Content

[0005] The technical problem to be solved by the present invention is generally to provide an anti-overload yaw unit and system.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is:

[0007] In order to achieve yaw, an anti-overload yaw unit includes a first connecting portion and a second connecting portion that are arranged to rotate with each other; a driving component is arranged between the first connecting portion and the second connecting portion;

[0008] The driving assembly actively moves to cause the first connecting portion and the second connecting portion to rotate relative to each other;

[0009] The driving assembly includes a lever arm; the lever arm is connected to a fixed fulcrum, a large arm and a small arm;

[0010] The big arm adopts driving rod; the small arm adopts driven rod;

[0011] The driven rod is hinged with a card seat member;

[0012] When the root of the driving rod is hinged to the first connecting part or the second connecting part, the clamping seat intermittently clamps the second connecting part or the first connecting part.

[0013] As a further improvement of the above technical solution:

[0014] For overall connection, the fixed fulcrum is hinged on the first connecting part or the second connecting part;

[0015] The first connection portion is used to connect to the tower or the nacelle and the second connection portion is used to connect to the nacelle or the tower.

[0016] In order to realize motion control, when the card seat part returns, the card seat part is separated from the clamping force of the second connecting part or the first connecting part and returns to the starting position;

[0017] In order to realize the return stroke control, when the clamping member moves forward, the clamping member is clamped and connected with the second connecting part or the first connecting part, and drives the second connecting part or the first connecting part to rotate the set angle;

[0018] The card seat member is guided on the second connecting portion or the first connecting portion and moves along the arc;

[0019] The driving rod is extended and retracted to drive the lever arm to swing, and drives the base member to move in an arc through the driven rod.

[0020] In order to reduce the volume, the driving assembly is located in the inner cavity of the first connecting part or the second connecting part.

[0021] When the second connection portion includes a support member or a rotating member, the first connection portion includes a rotating member or a support member.

[0022] In order to expand the swing range of the mechanism, a number of connecting lugs A and B are provided on the support member;

[0023] The rotating member includes a connecting flange portion;

[0024] A clamping member is provided on the rotating member, an annular groove portion is provided on the rotating member, and an inner guide ring is provided on the inner side wall of the rotating member;

[0025] The driving rod is hinged to the connecting lug A via the hinge axis A, and the lever arm is hinged to the connecting lug B via the hinge axis B;

[0026] The driven rod is hinged between the lever arm and the card seat part.

[0027] In order to improve the installation process and increase the overall service life, several platter pieces are distributed in the annular groove;

[0028] The clamping part is a sphere or a cylinder or a combination of a spherical cap and a cylinder;

[0029] The snap-on piece is on the platter piece;

[0030] The connector is a wearing part.

[0031] In order to achieve overall limiting and guiding, the clamping seat includes an N-type clamping head and an L-type clamping head arranged below the N-type clamping head;

[0032] The front end of the n-type clamp is clamped on the rotating part or the supporting part;

[0033] A movable plate is provided in the groove of the n-type clamp for lifting;

[0034] The movable plate is in pressure contact, bite contact, electromagnetic contact and / or friction contact with the clamping part;

[0035] Side baffles are provided on both sides of the n-type clamp;

[0036] A clamping rod is provided between the horizontal plate and the movable plate of the n-type clamp;

[0037] A circumferential groove is provided on the vertical plate of the L-shaped clamp, and the circumferential groove is adapted to the inner guide ring;

[0038] A plurality of mounting grooves are distributed on the support member, and wear-resistant pads are installed in the mounting grooves;

[0039] A contact surface is provided on the rotating member for contacting the wear-resistant pad;

[0040] When the clamping member adopts a steel ball or a ball crown and a column assembly, the lower part of the clamping member is set in the platter, and a plurality of holes are set on the movable plate for engaging the upper part of the clamping member exposed on the upper surface of the platter after it is lowered;

[0041] When the clamping member is a steel ball, the distance from the top of the steel ball to the upper surface of the platter member is greater than 1 / 2 of the radius of the steel ball and less than 3 / 4 of the radius of the steel ball.

[0042] The contact surface is below the connecting flange; an annular groove is provided on the upper portion of the connecting flange, and the inner guide ring is in the inner hole of the annular groove.

[0043] In order to achieve overall protection, a system is provided, comprising the above-mentioned anti-overload yaw unit.

[0044] This utility model avoids the technical problems of broken gear teeth; it also avoids the technical problems of drive pins becoming stuck and unable to be removed, misaligned, and twisted. It integrates the brake and yaw functions to prevent overload engagement. By placing the drive components within the inner cavity, this utility model reduces the overall volume and resolves the width restrictions associated with component transportation, particularly on highways or underpasses. The drive components are located within the tower body, facilitating easy repair and maintenance.

[0045] When external force acts, especially when the oil cylinder is damaged, the steel ball crown is used to achieve overload protection to avoid jamming and damage to other components. The steel ball is used as a wearing part to reduce maintenance costs. During maintenance, only the damaged steel ball needs to be replaced.

[0046] The utility model has the advantages of reasonable design, low cost, durability, safety and reliability, simple operation, time and labor saving, money saving, compact structure and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the yaw use structure of the utility model.

[0048] Figure 2 It is a structural schematic diagram of the rotating part of the utility model.

[0049] Figure 3 It is a schematic diagram of the contact surface structure of the utility model.

[0050] Figure 4 It is a structural schematic diagram of the connecting flange portion of the utility model.

[0051] Figure 5 It is a schematic diagram of the use structure of the lever arm of the utility model.

[0052] Figure 6 It is a schematic diagram of the structure of the drive assembly of the utility model.

[0053] Among them: 1. First connecting part; 2. Second connecting part; 3. Drive assembly; 4. Support member; 5. Rotating member; 6. Connecting lug A; 7. Connecting lug B; 8. Contact surface; 9. Mounting groove; 10. Wear-resistant pad; 11. Connecting flange; 12. Inner guide ring; 13. Annular groove; 14. Platter member; 15. Clamping member; 16. Articulated shaft A; 17. Drive rod member; 18. Lever arm; 19. Articulated shaft B; 20. Follower rod; 21. Base member; 22. Side baffle; 23. Movable plate; 24. N-type clamp; 25. L-type clamp; 26. Circumferential groove; 27. Clamping rod. DETAILED DESCRIPTION

[0054] like Figure 1-6 As shown, the anti-overload yaw unit of this embodiment includes a first connecting part 1 and a second connecting part 2 that are arranged to rotate with each other. Its structure is not limited to the drawings and can be a frame, a box or other similar structures. It can be an integral part or a split part. A drive component 3 is provided between the first connecting part 1 and the second connecting part 2. This is the core store of the improvement of the utility model.

[0055] The driving assembly 3 actively moves to make the first connecting part 1 and the second connecting part 2 rotate relative to each other; its active movement is preferably hydraulically driven. As an extension, in theory, it can also be electrically or mechanically driven.

[0056] The driving assembly 3 includes a lever arm 18; the lever arm 18 is connected to a fixed fulcrum, an upper arm and a lower arm; the utility model is a force-saving lever. The example in the figure is to place the upper arm and the lower arm on the same side of the fulcrum. Compared with being arranged on both sides of the fulcrum, its structure is compact, so that the force arm is fully utilized, that is, the upper arm also utilizes the force arm of the lower arm.

[0057] The upper arm adopts a driving rod 17, which is preferably a linear drive and a conventional structure to realize power input; the lower arm adopts a driven rod 20 to realize power output, which can be a straight rod, a curved rod, or other similar structures;

[0058] The driven rod 20 is hinged with a card seat 21 to realize card drive. Of course, it can also be a frame.

[0059] When the root of the driving rod 17 is hinged to the first connecting part 1 or the second connecting part 2, the clamping member 21 intermittently clamps the second connecting part 2 or the first connecting part 1. This means that the upper part can be connected to the tower body and the lower part to the cabin, or the lower part can be connected to the tower body and the upper part to the cabin.

[0060] The fixed fulcrum is hinged on the first connecting part 1 or the second connecting part 2 to achieve fixed support;

[0061] The first connection part 1 is used to connect to the tower or the nacelle and the second connection part 2 is used to connect to the nacelle or the tower.

[0062] When the clamping member 21 returns, the clamping member 21 is separated from the second connecting portion 2 or the first connecting portion 1 and returns to the starting position;

[0063] The drive assembly 3 is located in the inner cavity of the first connecting part 1 or the second connecting part 2, which can greatly reduce the external volume and facilitate transportation. Under the same volume, a bearing with a larger turning radius can be installed, thereby increasing the service life of the bearing. It should be noted that in order to facilitate assembly, the existing technology generally installs the drive assembly on the outside of the rotating bearing, because the outer gear ring is easier to process and manufacture than the inner gear ring, and the performance is better than the inner teeth. Therefore, the use of external teeth is a design thinking inertia, which leads to the existing technology generally setting the drive part on the outside.

[0064] When the clamping member 21 moves forward, the clamping member 21 is clamped and connected with the second connecting portion 2 or the first connecting portion 1, and drives the second connecting portion 2 or the first connecting portion 1 to rotate the set angle;

[0065] The card seat member 21 is guided on the second connecting portion 2 or the first connecting portion 1 and moves along the arc;

[0066] The drive rod 17 retracts and drives the lever arm 18 to swing, which in turn drives the base member 21 in an arc motion via the driven rod 20. This arc motion can be achieved by constraining the rotational member 5's own degrees of freedom, while retaining rotation about the Z axis, or by providing an arc guide on the base member 21. The former simplifies the structure but applies an oblique force to the rotational member 5, resulting in a normal force component on the bearing connected to the rotational member, shortening its service life. If an arc guide is used, a conventional structure such as a guide groove can be used to avoid applying oblique forces to the rotational member 5.

[0067] When the second connection part 2 includes the support member 4 or the rotating member 5, the first connection part 1 includes the rotating member 5 or the support member 4. Figure 5However, as an extended protection, the rotating member 5 and the supporting member 4 can correspond to a part of the first connecting part 1 or the second connecting part 2, both of which are within the protection range.

[0068] The support member 4 is provided with a plurality of connecting lugs A6 and B7, which serve as support points. The lug design can optimize the structure and increase the arc movement range of the connecting rod.

[0069] As a specific introduction, the rotating member 5 includes a connecting flange portion 11, which can be a conventional flange and is not limited to the structure shown in the drawings;

[0070] As a step-by-step protection, a clamping member 15 is provided on the rotating member 5. That is, in theory, the clamping member is provided on the rotating member. It can be a convex member or a concave member, both of which can be clamped. It is preferably a convex member, so that the matching base member 21 is a concave member; thereby balancing the service life of each component, because the base member 21 is frequently used, and the clamping member 15 is used intermittently. Through intermittent use, the fatigue of the clamping member 15 is relieved and the internal stress is released.

[0071] The driving rod 17 is hinged to the connecting lug A6 via the hinge axis A16, and the lever arm 18 is hinged to the connecting lug B7 via the hinge axis B19;

[0072] The driven rod 20 is hinged between the lever arm 18 and the seat part 21, thereby realizing the connecting rod drive. This structure is a labor-saving lever with a preferred same-side force arm. Of course, in order to avoid the use of levers with force arms on both sides in the present invention to constitute the same concept in the upper level, the lever arms on the same side can greatly save space and realize a simplified structure, which is a further innovation of the levers with force arms on both sides.

[0073] An annular groove 13 is provided on the rotating member 5, and an inner guide ring 12 is provided on the inner wall of the rotating member 5; thereby achieving positioning, and also guiding the constraint of the Z-axis up and down direction of the card seat, supporting the card seat member 21 and limiting the radial outward.

[0074] Although the clamping part 15 is used intermittently, it realizes the transmission of yaw rotation force during use and is subjected to huge force, especially at the moment of starting or stopping, when the inertia force is huge. Several platter parts 14 are distributed in the annular groove 13, which facilitates installation and maintenance.

[0075] As an example, the clamping member 15 is a sphere or a cylinder or a combination of a spherical cap and a cylinder;

[0076] The clamping member 15 is on the platter member 14;

[0077] The clamping member 15 is a wearing part, which is easy to replace and greatly reduces maintenance costs. At the same time, when a fault occurs, especially when overloaded, the clamping member is used as the one with the lowest safety factor, that is, it is damaged first, thereby ensuring the safety of other parts.

[0078] The card seat 21 includes an n-shaped card head 24 and an L-shaped card head 25 disposed below the n-shaped card head 24;

[0079] The front end of the n-type clamping head 24 is clamped on the rotating member 5 or the supporting member 4, thereby realizing reasonable restriction on the degree of freedom of the clamping seat member 21 and ensuring accurate travel.

[0080] A movable plate 23 is installed in the groove of the N-type clamp 24, which can be lifted and lowered to achieve the clamping connection. Compared with the lateral telescopic movement, it moves the travel space to the Z axis, thereby reducing the horizontal lateral space and facilitating the installation of larger bearings. At the same time, compared with the rotating annular surface, it is more convenient to manufacture and process, and the force direction is separated from the rotational driving force direction. This can achieve the integration of braking and driving.

[0081] The movable plate 23 is in pressure contact, bite contact, electromagnetic contact and / or friction contact with the clamping member 15; as an innovation, a physical bite model is adopted to achieve good braking.

[0082] Side baffles 22 are provided on both sides of the n-type clamp head 24; since the clamping member 15 is a wearing part, if it is damaged during operation, it will fall and produce falling objects from high altitude or enter other mechanisms, causing malfunctions. The side baffles 22 are used to prevent broken parts from falling.

[0083] A clamping rod 27 is provided between the transverse plate of the n-type clamp 24 and the movable plate 23 to achieve driving movement, which can be electromagnetic, hydraulic or mechanical driving of the clamping rod 27 to move linearly, which can be a push rod, a screw rod, or a wedge.

[0084] A circumferential groove 26 is provided on the vertical plate of the L-shaped clamp 25 , and the circumferential groove 26 is adapted to fit the inner guide ring 12 , thereby realizing functions such as support or guidance.

[0085] A plurality of mounting grooves 9 are distributed on the support member 4, and wear-resistant pads 10 are installed in the mounting grooves 9;

[0086] A contact surface 8 is provided on the rotating member 5 for contacting the wear-resistant pad 10;

[0087] Conventional parts such as bearings can be provided on the support member 4 and the rotating member 5 .

[0088] When the clamping member 15 is a steel ball or a spherical cap and a column assembly, the lower portion of the clamping member 15 is disposed in the platter member 14, and a plurality of holes are provided on the movable plate 23 for engaging the upper portion of the clamping member 15 exposed on the upper surface of the platter member 14 after the movable plate 23 is lowered;

[0089] Steel balls are preferred, allowing for flexible positioning and automatic overload protection. By setting the ultimate pressure of the clamping rod 27 below the overload limit, when an overload occurs, the clamping member 15, acting on the spherical surface, moves upward as it crosses the steel balls, thereby separating the corresponding steel balls and preventing jamming. Multiple steel balls enable multi-point positioning and engagement.

[0090] Preferably, when the clamping member 15 is a steel ball, the distance from the top of the steel ball to the upper surface of the platter member 14 is greater than 1 / 2 of the radius of the steel ball and less than 3 / 4 of the radius of the steel ball, thereby achieving engagement and preventing slippage.

[0091] As a structural form, the contact surface 8 is below the connecting flange portion 11 ; an annular groove portion 13 is provided on the upper portion of the connecting flange portion 11 , and the inner guide ring 12 is in the inner hole of the annular groove portion 13 .

[0092] The system of this embodiment includes the above-mentioned anti-overload yaw unit, thereby achieving overall protection.

[0093] When the clamping member 15 is a steel ball, the clamping rod 27 is telescopically set, and the positive limit pressure of the clamping rod 27 is less than the vertical force component of the movable plate 23 and the spherical surface of the steel ball, the movable plate 23 passes over the spherical surface of the steel ball, and at the same time, the clamping rod 27 retracts in the opposite direction.

[0094] like Figure 1-6 The anti-overload yaw method of this embodiment is used for a wind turbine, and the method includes the following steps:

[0095] Step 1: The movable plate 23 clamps the card holder 21;

[0096] Step 2: The driving assembly 3 moves forward, causing the first connecting portion 1 and the second connecting portion 2 to rotate relative to each other;

[0097] Step 3: The movable plate 23 releases the card holder 21;

[0098] In step 4, the driving assembly 3 moves in the reverse direction, so that the first connecting portion 1 and the second connecting portion 2 rotate relative to each other.

[0099] In step 1, the movable plate 23 is clamped by the clamping member 15 .

[0100] In step 2, the driving rod 17 is driven in the forward direction, and drives the driven rod 20 to swing through the lever arm 18, so that the seat member 21 moves forward along the arc to the end of the stroke, driving the rotating member 5 to rotate synchronously.

[0101] In step three, the movable plate 23 is separated from the clamping member 15 .

[0102] In step 4, the driving rod 17 is driven in the reverse direction, and the driven rod 20 is driven to swing through the lever arm 18, so that the seat member 21 retreats around the arc to the starting point of the stroke.

[0103] When the second connection part 2 includes the rotating member 5 , the second connection part 2 is connected to the nacelle, and the supporting member 4 is connected to the tower.

[0104] When the first connecting portion 1 and the second connecting portion 2 rotate relative to each other, the rotating member 5 rotates relative to the supporting member 4 via the wear-resistant pad 10 .

[0105] In step 2 and step 4, when the clamping member 15 is a steel ball;

[0106] The driving rod 17 telescopes and drives the lever arm 18 to swing, and drives the base member 21 through the driven rod 20, so that the front end of the N-type clamping head 24 moves in an arc on the rotating member 5 or the support member 4 and / or the L-type clamping head 25 moves in an arc along the inner guide ring 12.

[0107] When the clamping member 15 adopts a steel ball, if any steel ball is damaged, it should be replaced.

[0108] The overload-proof wind turbine of this embodiment includes a tower, a nacelle, and an overload-proof yaw unit disposed between the tower and the nacelle;

[0109] The first connection part 1 is connected to the tower or the nacelle and the second connection part 2 is connected to the nacelle or the tower;

[0110] A first connecting portion 1 and a second connecting portion 2 are arranged to rotate with each other; a driving component 3 is arranged between the first connecting portion 1 and the second connecting portion 2;

[0111] The driving assembly 3 actively moves to make the first connecting part 1 and the second connecting part 2 rotate relative to each other;

[0112] The driving assembly 3 includes a lever arm 18; the lever arm 18 is connected to a fixed fulcrum, a large arm and a small arm;

[0113] The upper arm adopts a driving rod 17; the lower arm adopts a driven rod 20;

[0114] The driven rod 20 is hinged with a card seat 21;

[0115] When the root of the driving rod 17 is hinged to the first connecting part 1 or the second connecting part 2 , the clamping member 21 intermittently clamps the second connecting part 2 or the first connecting part 1 .

[0116] The utility model realizes the relative rotation of the first connecting part 1 and the second connecting part 2 through the driving component 3, the support part 4 realizes support and provides counter-support force, the rotating part 5 realizes rotational yaw, the connecting lug A6 and the connecting lug B7 realize support, the contact surface 8, the mounting groove 9, and the wear-resistant pad 10 realize rotational support, which can be rotated through the bearing, the connecting flange part 11 realizes connection with other parts, the inner guide ring 12 realizes guidance, the annular groove part 13 realizes the installation of the platter part 14, thereby fixing the clamping part 15, and realizes the connecting rod driving the card seat part 21 to realize yaw action through the hinge shaft A16, the driving rod part 17, the lever arm 18, the hinge shaft B19, and the driven rod 20, and realizes side blocking through the side baffle 22. It can be equipped with dust-proof parts, the clamping rod 27 realizes clamping through the movable plate 23, the n-type clamp 24, the L-type clamp 25, and the circumferential groove 26 realize guide support.

[0117] The present invention is fully described for the purpose of clearer disclosure, and the prior art will not be listed one by one.

[0118] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may be modified or some of the technical features thereof may be replaced with equivalents. It is obvious for those skilled in the art to combine multiple technical solutions of the present invention. However, these modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any technical content not fully described in this utility model is generally known technology.

Claims

1. An anti-overload yaw unit, characterized by: It comprises a first connecting part (1) and a second connecting part (2) which are arranged to rotate with each other; a driving component (3) is arranged between the first connecting part (1) and the second connecting part (2); The driving component (3) actively moves to cause the first connecting portion (1) and the second connecting portion (2) to rotate relative to each other; The driving assembly (3) includes a lever arm (18); the lever arm (18) is connected to a fixed fulcrum, a large arm and a small arm; The upper arm adopts a driving rod (17); the lower arm adopts a driven rod (20); The driven rod (20) is hingedly connected to a card seat (21); When the root of the driving rod (17) is hinged on the first connecting part (1) or the second connecting part (2), the clamping seat (21) intermittently clamps the second connecting part (2) or the first connecting part (1).

2. The anti-overload yaw unit according to claim 1, characterized in that: The fixed fulcrum is hinged on the first connecting part (1) or the second connecting part (2); The first connection part (1) is used for connecting to a tower or a nacelle and the second connection part (2) is used for connecting to a nacelle or a tower.

3. The anti-overload yaw unit according to claim 1, characterized in that: When the clamping member (21) returns, the clamping member (21) is separated from the second connecting portion (2) or the first connecting portion (1) and returns to the starting position; The drive assembly (3) is located in the inner cavity of the first connecting part (1) or the second connecting part (2).

4. The anti-overload yaw unit according to claim 1, characterized in that: When the clamping member (21) moves forward, the clamping member (21) is clamped and connected with the second connecting portion (2) or the first connecting portion (1), and drives the second connecting portion (2) or the first connecting portion (1) to rotate to a set angle; The card seat (21) is guided on the second connecting portion (2) or the first connecting portion (1) and moves along an arc; The driving rod (17) is telescopically driven to drive the lever arm (18) to swing, and drives the card seat (21) to move in an arc through the driven rod (20).

5. The anti-overload yaw unit according to any one of claims 1 to 4, characterized in that: When the second connecting part (2) includes a supporting member (4) or a rotating member (5), the first connecting part (1) includes a rotating member (5) or a supporting member (4).

6. The anti-overload yaw unit according to claim 5, characterized in that: A plurality of connecting lugs A (6) and connecting lugs B (7) are provided on the support member (4); The rotating member (5) includes a connecting flange portion (11); A clamping member (15) is provided on the rotating member (5). The driving rod (17) is hinged to the connecting lug A (6) via the hinge axis A (16), and the lever arm (18) is hinged to the connecting lug B (7) via the hinge axis B (19); The driven rod (20) is hinged between the lever arm (18) and the card seat (21).

7. The anti-overload yaw unit according to claim 6, characterized in that: An annular groove (13) is provided on the rotating member (5), and an inner guide ring (12) is provided on the inner side wall of the rotating member (5); A plurality of platter pieces (14) are distributed in the annular groove (13); The clamping member (15) is a sphere or a cylinder or a combination of a spherical cap and a cylinder; The clamping member (15) is on the platter member (14); The clamping part (15) is a wearing part.

8. The anti-overload yaw unit according to claim 7, characterized in that: The card seat (21) includes an n-type card head (24) and an L-type card head (25) arranged below the n-type card head (24); The front end of the n-type clamp (24) is clamped on the rotating member (5) or the supporting member (4); A movable plate (23) is provided in the groove of the n-type clamp (24) for lifting; The movable plate (23) is in pressure contact, bite contact, electromagnetic contact and / or friction contact with the clamping member (15); Side baffles (22) are provided on both sides of the n-type clamp (24); A clamping rod (27) is provided between the horizontal plate of the n-type clamp (24) and the movable plate (23); A circumferential groove (26) is provided on the vertical plate of the L-shaped clamp (25), and the circumferential groove (26) is adapted to fit the inner guide ring (12); When the clamping member (15) is a steel ball or a ball crown and a column assembly, the lower portion of the clamping member (15) is arranged in the platter member (14), and a plurality of holes are provided on the movable plate (23) for engaging the upper portion of the clamping member (15) exposed on the upper surface of the platter member (14) after the movable plate (23) is lowered; When the clamping member (15) is a steel ball, the distance from the top of the steel ball to the upper surface of the platter member (14) is greater than 1 / 2 of the radius of the steel ball and less than 3 / 4 of the radius of the steel ball.

9. The anti-overload yaw unit according to claim 8, characterized in that: The contact surface (8) is below the connecting flange (11); an annular groove (13) is provided on the upper portion of the connecting flange (11), and the inner guide ring (12) is in the inner hole of the annular groove (13); A plurality of mounting grooves (9) are distributed on the support member (4), and wear-resistant pads (10) are installed in the mounting grooves (9); A contact surface (8) is provided on the rotating member (5) for contacting the wear-resistant pad (10); When the clamping member (15) adopts a steel ball, the clamping rod (27) is telescopically arranged, and the positive limit pressure of the clamping rod (27) is less than the vertical force component of the movable plate (23) and the spherical surface of the steel ball, the movable plate (23) passes over the spherical surface of the steel ball, and at the same time, the clamping rod (27) is retracted in the opposite direction.

10. A system, characterized in that: The invention comprises the anti-overload yaw unit according to any one of claims 1 to 9.

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