Self-weight bearing type roller bracket for oversized wind power main shaft

Abstract

The invention discloses a self-weight bearing type roller bracket for a super-large wind power main shaft, belongs to the technical field of wind generating sets, and solves the problems that an existing rigid bracket is uneven in supporting stress and cannot automatically reset. The bracket comprises an enveloping device, a flexible bracket, a limiting device, a supporting frame, a self-locking mechanism, a bracket supporting vehicle and a compression spring, and automatic attaching and bearing are achieved by means of the self weight of a main shaft. When the main shaft is placed in, the flexible supporting plate sinks for buffering, the limiting device moves downwards accordingly, and the clamping plate is driven to envelope the main shaft through sliding fit of the limiting groove and the clamping plate limiting block; the self-locking mechanism automatically resets under the action of gravity to form passive self-locking, and the main shaft is prevented from jumping and sliding. And when the main shaft is taken out, the self-locking mechanism is unlocked by external force, and the spring tension drives each component to automatically reset, so that the enveloping device is recovered to an open state. The bracket does not need to be manually adjusted, has supporting and moving functions, can absorb transportation impact, avoids surface damage of the main shaft, and prevents the main shaft from jumping and sliding through a reliable self-locking function.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine generator technology, specifically a self-weight bearing roller bracket for ultra-large wind turbine main shafts. Background Technology

[0002] The ultra-large wind turbine main shaft requires a bracket to provide reliable support and stable constraints during casting, heat treatment, machining and in-plant transportation. Its posture stability during transportation is directly related to operational safety and the surface quality of the main shaft.

[0003] Existing wind turbine main shaft roller brackets (such as CN 114871685) still have significant shortcomings in terms of adaptability, stability, and safety: the support of this type of bracket is highly dependent on manual or lifting adjustment, and only adapts to the unevenness of the outer surface of the main shaft through the local expansion and contraction of the spring. It cannot achieve automatic fitting with the weight of the main shaft itself, and lacks adaptive load-bearing capacity for ultra-large wind turbine main shafts of different diameters and weights, which can easily lead to uneven support force and local off-center load; its limiting structure does not form an envelope constraint, and only has a one-way mechanical self-locking function, which is difficult to suppress radial swaying or local lifting of the main shaft under complex working conditions such as transportation bumps and inertial impacts, and there is a risk of slippage; the device body does not have an automatic reset mechanism, and the position of each component needs to be manually readjusted after the main shaft is picked up or put down, which is cumbersome and affects the overall operation efficiency.

[0004] In view of the above-mentioned shortcomings of the existing technology, there is an urgent need to propose a new type of roller bracket that can automatically bear load using the self-weight of the main shaft, has adaptive envelope capability, can achieve reliable self-locking, and has both movement and support functions, so as to meet the high safety and high stability support and transportation requirements of ultra-large wind turbine main shafts in multiple processes. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a self-weight bearing roller bracket for ultra-large wind turbine main shafts. This bracket achieves automatic contact with the main shaft by utilizing its own weight, thereby realizing adaptive bearing, automatic limiting, and automatic reset functions. Under the premise of simplifying the structural design, it significantly improves the stability and safety of ultra-large wind turbine main shafts throughout the entire process of storage, support, and in-plant transportation, effectively solving the above-mentioned technical defects of existing brackets.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a self-weight bearing roller bracket for ultra-large wind turbine main shafts, comprising: an enveloping device, a flexible bracket, a limiting device, a support frame, a self-locking mechanism, a bracket support carriage, and a compression spring; the support frame is fixedly installed on the bracket support carriage, the enveloping device is fixedly installed at both ends of the support beam of the support frame, the limiting device is fitted on the support frame, the flexible bracket is fixedly installed on the top of the limiting device, a self-locking mechanism is provided between the limiting device and the enveloping device, and a compression spring is installed below the support beam of the support frame for support; The enveloping device includes: a roller, a clamping plate, and a clamping plate limiting block. The roller is fixedly installed on the top of the clamping plate, and the clamping plate limiting block is fixedly installed on the bottom of the clamping plate. The clamping plate is connected to the supporting beam through a rotating joint, and the clamping plate limiting block at the bottom of the clamping plate can slide within the limiting groove as a movable joint. The flexible bracket includes a flexible support plate and a support block. The flexible support plate is disposed on the upper surface of the support block, and the support block is fixedly connected to the upper surface of the sleeve in the limiting device. The limiting device includes: a limiting plate, a pin, a limiting groove, and a sleeve. The limiting plate is provided with a limiting groove, and the clamping plate limiting block moves in a controlled manner within the limiting groove. The limiting plate has a through hole in the center, which cooperates with the support shaft and can slide up and down along the support shaft. The support frame includes a support beam and a support shaft. The support shaft mates with holes on the surface of the bracket support vehicle to provide guidance and support for the limiting device and the enveloping device. The support shaft is fixedly connected to the support beam. The support beam forms a rotating pair with the clamping plate through a pin, so that the clamping plate can be adjusted in angle under force to envelop the wind turbine main shaft. The self-locking mechanism includes a self-locking limiting block and a self-locking groove. The front end of the self-locking groove is provided with a through hole and forms a rotating pair with the limiting plate through a pin. The bottom of the self-locking limiting block is supported on the limiting plate. The upper end of the compression spring is connected to the lower surface of the supporting beam, and the lower end of the compression spring is connected to the upper surface of the limiting plate.

[0007] As an optimization, the rollers are in direct contact with the outer circumference of the wind turbine main shaft to provide rolling support.

[0008] As an optimization: when the wind turbine main shaft is placed above the flexible support plate, the flexible support plate will undergo a slight elastic sinking under the weight of the wind turbine main shaft, thereby providing a buffer and achieving adaptive fitting for wind turbine main shafts of different diameters.

[0009] As an optimization: when the clamping plate limiting block moves to the right along the limiting groove to the position of the self-locking groove, the self-locking groove is lifted and rotated under the action of force; when the clamping plate limiting block reaches the limit position, the self-locking groove automatically resets under the action of gravity, thereby forming a passive block, thus realizing the passive self-locking of the clamping plate limiting block and preventing the wind turbine main shaft from lifting or slipping during transportation vibration.

[0010] As an optimization: when the wind turbine main shaft is not placed in the self-weight bearing roller bracket, the envelope device is in the open state; the spring is under tension, the limiting device is in the upper limit position, and the clamping plate limiting block is located at the leftmost side of the limiting groove.

[0011] As an optimization: when the wind turbine main shaft is placed into the self-weight bearing roller bracket, the flexible support plate supports the wind turbine main shaft and moves downward with the sleeve. The spring tension gradually increases, and the limiting device moves down, causing the limiting groove to move down synchronously. This causes the clamping plate limiting block to move to the right through the sliding pair, and then through the rotation pair between the clamping plate and the supporting beam, the upper part of the clamping plate gradually envelops the wind turbine main shaft. During this process, the self-locking mechanism, which forms a rotating pair with the pin shaft of the limiting device, is in the working state under the restriction of gravity and the self-locking limiting block; the right-moving clamping plate limiting block contacts the arc-shaped extension of the self-locking groove, lifting it up, and the self-locking mechanism switches to the non-working state; then, after the self-locking mechanism rises to the highest point, it falls under the action of gravity until the self-locking limiting block contacts the upper surface of the limiting groove, restoring the working state; at the same time, under the action of the main shaft's gravity, the flexible bracket and the limiting device slowly move down, and the clamping plate continuously envelops the main shaft; When the limiting device descends to its lowest point and contacts the upper surface of the bracket support, it stops falling. At this point, the spring reaches its tensile limit, the clamping plate limiting block moves to the right limit position via the sliding joint, and the clamping plate moves to the limit position via the rotating joint, achieving complete envelopment of the main shaft. After the external force is removed, the main shaft maintains the enveloping effect under the action of gravity. The self-locking mechanism locks the clamping plate limiting block through the action of gravity and the self-locking limiting block, ensuring the stability of the envelopment.

[0012] As an optimization: When the wind turbine main shaft is removed from the self-weight bearing roller bracket, the self-locking mechanism needs to be switched to the non-working state by external force. As the gravity of the main shaft on the flexible support plate and the limiting device decreases, the upward pulling force of the spring causes the flexible support plate and the limiting device to move upward. At this time, the clamping plate limiting block is released from the self-locking restriction and moves to the left along the limiting groove. The clamping plate rotates through the rotating joint, gradually releasing the envelope on the main shaft. Finally, the main shaft is released from the flexible support plate under the action of external force, the limiting device and the spring return to the initial position, the clamping plate limiting block returns to the leftmost side of the limiting groove, and the envelope device returns to the open state.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Achieve self-adaptive load-bearing capacity: The bracket uses the weight of the spindle itself to automatically fit and press down, so that the rollers, flexible support plate and clamping plate form a follow-up support. It can adapt to spindles of different diameters and weights without manual adjustment, and the load distribution is uniform, avoiding the problems of uneven load and rolling drift of traditional brackets.

[0014] 2. It has the ability to limit the position and passively lock the spindle: Through the coordinated operation of the limiting groove, the clamping plate limiting block and the self-locking groove, the spindle can still maintain a stable position when it is bumpy during transportation or disturbed by external forces; the self-locking mechanism automatically rotates and resets after the clamping plate limiting block is in place, forming a passive block, effectively preventing the spindle from jumping, lifting or sliding, and improving safety.

[0015] 3. Flexible bracket absorbs vibration and buffers, improving surface protection: The flexible bracket undergoes a small deformation under the weight of the spindle, which can buffer transportation vibration, reduce local contact pressure on the spindle, and reduce the risk of surface damage. It is especially suitable for long-stroke, multi-stage transportation conditions.

[0016] 4. Simple structure, automatic reset, and convenient maintenance: The main components use simple mechanical connections such as pins, slots, and rotating pairs to achieve the action. The mechanism has strong self-resetting ability, is easy to disassemble and assemble, and has low manufacturing cost, making it suitable for the needs of factories with large-size spindles that use it frequently. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a self-weight bearing roller bracket for ultra-large wind turbine main shaft proposed in this invention. Figure 2 This is a cross-sectional view of the self-weight bearing roller bracket in the open state of the present invention; Figure 3 This is a cross-sectional view of the self-weight bearing roller bracket in the closed state of the present invention; Figure 4 This is a partially enlarged schematic diagram of the self-locking device of the present invention; Legend: 1. Enveloping device; 2. Flexible bracket; 3. Limiting device; 4. Support frame; 5. Self-locking mechanism; 6. Bracket support carriage; 7. Compression spring; 101. Roller; 102. Clamping plate; 103. Clamping plate limiting block; 201. Flexible bracket; 202. Support block; 301. Limiting plate; 302. Pin shaft; 303. Limiting groove; 304. Sleeve; 401. Support beam; 402. Support shaft; 501. Self-locking limiting block; 502. Self-locking groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0020] like Figure 1-4 As shown, a self-weight bearing roller bracket for ultra-large wind turbine main shafts includes: an enveloping device 1, a flexible bracket 2, a limiting device 3, a support frame 4, a self-locking mechanism 5, a bracket support carriage 6, and a compression spring 7. The support frame 4 is fixedly mounted on the bracket support carriage 6. The enveloping device 1 is fixedly mounted at both ends of the support beam 401 of the support frame 4. The limiting device 3 is fitted onto the support frame 4. The flexible bracket 2 is fixedly mounted on the top of the limiting device 3. A self-locking mechanism 5 is provided between the limiting device 3 and the enveloping device 1. A compression spring 7 is installed below the support beam 401 of the support frame 4 for support. The entire device, through the rotational joints, sliding joints, and support cooperation between the above-mentioned components, achieves the functions of self-weight bearing, automatic enveloping limiting, self-locking anti-jumping, and automatic reset of the main shaft, ensuring the stability and safety of the main shaft during storage, transportation, and process switching.

[0021] The enveloping device 1 includes a roller 101, a clamping plate 102, and a clamping plate limiting block 103. The roller 101 is fixedly installed on the top of the clamping plate 102, and the clamping plate limiting block 103 is fixedly installed on the bottom of the clamping plate 102. The roller 101 is in direct contact with the outer circle of the wind turbine main shaft to provide rolling support. The clamping plate 102 is connected to the supporting beam 401 through a rotating joint. The clamping plate limiting block 103 at the bottom of the clamping plate 102 can slide within the limiting groove 303, thereby achieving an enveloping fit between the clamping plate 102 and the wind turbine main shaft under the constraint of the limiting groove 303.

[0022] The flexible support 2 includes a flexible support plate 201 and a support block 202. The flexible support plate 201 is disposed on the upper surface of the support block 202, and the support block 202 is fixedly connected to the upper surface of the sleeve 304 in the limiting device 3. When the wind turbine main shaft is placed above the flexible support plate 201, the flexible support plate 201 undergoes a slight elastic sinking under the weight of the wind turbine main shaft, forming a buffer fit against the wind turbine main shaft, thereby achieving adaptive support for wind turbine main shafts of different outer diameters. The deformation of the flexible support plate 201 absorbs the impact load during transportation, preventing the wind turbine main shaft from jumping during rolling or vibration, improving support stability, and reducing the risk of surface damage to the wind turbine main shaft.

[0023] The limiting device 3 includes a limiting plate 301, a pin 302, a limiting groove 303, and a sleeve 304. The limiting plate 301 is provided with a limiting groove 303, and the clamping plate limiting block 103 moves in a controlled manner within the limiting groove (303). The limiting plate 301 has a through hole in its center, which cooperates with the support shaft 402 and can slide up and down along the support shaft 402 to achieve synchronous downward movement "with the weight of the main shaft", providing synchronous guidance for the enveloping and self-locking actions. Through the above structure, the roller 101 can provide support and rolling while adhering to the wind turbine main shaft, the clamping plate 102 remains stably clamped under the constraint of the limiting groove 303, and the limiting plate 301 can move axially along the support shaft 402; thereby ensuring that the wind turbine main shaft does not deviate during transportation and support, and improving the overall load-bearing stability and positioning reliability.

[0024] The support frame 4 includes a support beam 401 and a support shaft 402. The support shaft 402 engages with a hole on the surface of the bracket support vehicle 6, providing guiding support for the limiting device 3 and the enveloping device 1. The support shaft 402 is fixedly connected to the support beam 401. The support beam 401 forms a rotating pair with the clamping plate 102 via a pin, allowing the clamping plate 102 to adjust its angle under force to envelop the wind turbine main shaft. Through this rotational setting, the clamping plate 102 can finely adjust its angle in the direction of force along with the wind turbine main shaft, achieving an enveloping limiting effect on the wind turbine main shaft, preventing lateral movement of the wind turbine main shaft during transportation or support. Furthermore, it can automatically swing back when the wind turbine main shaft is picked up or placed, improving the reliability of the limiting and the convenience of operation.

[0025] The self-locking mechanism 5 includes a self-locking limiting block 501 and a self-locking groove 502. The front end of the self-locking groove 502 has a through hole and forms a rotating pair with the limiting plate 301 through a pin 302. The bottom of the self-locking limiting block 501 is supported on the limiting plate 301. When the clamping plate limiting block 103 moves to the right along the limiting groove 303 to the position of the self-locking groove 502, the self-locking groove 502 is lifted and rotated under the action of force. When the clamping plate limiting block 103 reaches the limit position, the self-locking groove 502 automatically resets under the action of gravity, thereby forming a passive block, thus realizing the passive self-locking of the clamping plate limiting block 103 and preventing the wind turbine main shaft from lifting or slipping during transportation vibration.

[0026] The upper end of the compression spring 7 is connected to the lower surface of the supporting beam 401, and the lower end of the compression spring 7 is connected to the upper surface of the limiting plate 301. When the wind turbine main shaft is not inserted, the compression spring 7 provides an upward pulling force to keep the limiting device 3 in the highest position. When the wind turbine main shaft is inserted, the limiting plate 301 and the flexible support plate 201 move downward as a whole, overcoming the pulling force of the compression spring 7, thus completing the enveloping and self-locking action. When the wind turbine main shaft is removed, the limiting device 3 and the clamping plate 102 automatically return to their initial positions under the action of the pulling force of the compression spring 7, realizing automatic reset. In summary, the compression spring 7 is in a tensile preload state in the initial state, which is used to provide an upward traction force to the limiting device to prevent the limiting device from falling. When the wind turbine main shaft is placed on the flexible support 2, the limiting device 3 moves downward with the force, causing the compression spring 7 to be further stretched, thereby providing a continuous upward reset force throughout the entire bearing process, ensuring that the limiting device can automatically return to its initial position after the main shaft is removed, realizing the passive reset and reuse of the limiting mechanism.

[0027] The working principle of this invention is as follows: When the wind turbine main shaft is not inserted, the envelope device 1 is in the open state; the spring 7 is stretched, the limiting device 3 is in the upper limit position, and the clamping plate limiting block 103 is located at the leftmost side of the limiting groove 303.

[0028] After the spindle is inserted, the flexible support plate 201 supports the spindle and moves downward with the sleeve 304, and the tension of the spring 7 gradually increases. The downward movement of the limiting device 3 drives the limiting groove 303 to move downward synchronously, so that the clamping plate limiting block 103 moves to the right through the sliding joint, and then through the rotating joint between the clamping plate 102 and the supporting beam 401, drives the upper part of the clamping plate 102 to gradually envelop the spindle.

[0029] During this process, the self-locking mechanism 5, which forms a rotating pair with the pin shaft 302 of the limiting device 3, is in the working state under the restriction of gravity and the self-locking limiting block 501. The right-moving clamping plate limiting block 103 contacts the arc-shaped extension of the self-locking groove 502, lifting it up, and the self-locking mechanism 5 switches to the non-working state; then, after the self-locking mechanism 5 rises to the highest point, it falls under the action of gravity until the self-locking limiting block 501 contacts the upper surface of the limiting groove 303, restoring the working state. At the same time, under the action of the main shaft's gravity, the flexible bracket 2 and the limiting device 3 slowly move down, and the clamping plate 102 continuously envelops the main shaft.

[0030] When the limiting device 3 descends to its lowest point and contacts the upper surface of the bracket support 6, it stops falling. At this time, the spring 7 reaches its tensile limit, the clamping plate limiting block 103 moves to its right limit position via the sliding joint, and the clamping plate 102 moves to its limit position via the rotating joint, achieving complete envelopment of the main shaft. After the external force is removed, the main shaft maintains the enveloping effect under the action of gravity, and the self-locking mechanism 5 locks the clamping plate limiting block 103 through the action of gravity and the self-locking limiting block 501, ensuring the stability of the envelopment.

[0031] When removing the spindle, external force is required to switch the self-locking mechanism 5 to the non-working state. As the gravity of the spindle on the flexible support plate 201 and the limiting device 3 decreases, combined with the upward pulling force of the spring 7, the flexible support plate 201 and the limiting device 3 move upward. At this time, the clamping plate limiting block 103 disengages from the self-locking restriction and moves to the left along the limiting groove 303. The clamping plate 102 rotates through the rotary joint, gradually releasing its envelopment on the spindle. Finally, the spindle disengages from the flexible support plate 201 under the action of external force, the limiting device 3 and the spring 7 return to their initial positions, the clamping plate limiting block 103 returns to the leftmost side of the limiting groove 303, and the enveloping device 1 returns to the open state.

[0032] The bracket of this invention requires no manual adjustment, has both support and movement functions, can absorb transportation impact, avoid damage to the main shaft surface, and prevent the main shaft from jumping and slipping through a reliable self-locking function, significantly improving the support stability and transportation safety of ultra-large wind turbine main shafts in multiple processes. It has a simple structure and is easy to maintain.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-weight bearing roller bracket for ultra-large wind turbine main shafts, characterized in that: include: Enveloping device (1), flexible bracket (2), limiting device (3), support frame (4), self-locking mechanism (5), bracket support carriage (6) and compression spring (7); the support frame (4) is fixedly installed on the bracket support carriage (6), the two ends of the support beam (401) of the support frame (4) are fixedly installed with enveloping device (1), the support frame (4) is fitted with limiting device (3), the top of the limiting device (3) is fixedly installed with flexible bracket (2), the limiting device (3) and the enveloping device (1) are provided with self-locking mechanism (5), and the support beam (401) of the support frame (4) is supported by compression spring (7) installed below it; The envelope device (1) includes: a roller (101), a clamping plate (102), and a clamping plate limiting block (103). The roller (101) is fixedly installed on the top of the clamping plate (102), and the clamping plate limiting block (103) is fixedly installed on the bottom of the clamping plate (102). The clamping plate (102) is connected to the supporting beam (401) through a rotating joint, and the clamping plate limiting block (103) at the bottom of the clamping plate (102) can slide within the limiting groove (303). The flexible bracket (2) includes a flexible support plate (201) and a support block (202). The flexible support plate (201) is disposed on the upper surface of the support block (202), and the support block (202) is fixedly connected to the upper surface of the sleeve (304) in the limiting device (3). The limiting device (3) includes: a limiting plate (301), a pin (302), a limiting groove (303), and a sleeve (304). The limiting plate (301) is provided with a limiting groove (303), and the clamping plate limiting block (103) moves in a controlled manner within the limiting groove (303). The limiting plate (301) has a through hole in the center, which cooperates with the support shaft (402) and can slide up and down along the support shaft (402). The support frame (4) includes a support beam (401) and a support shaft (402). The support shaft (402) is engaged with a hole on the surface of the bracket support vehicle (6) to provide guidance support for the limiting device (3) and the enveloping device (1). The support shaft (402) is fixedly connected to the support beam (401). The support beam (401) forms a rotating pair with the clamping plate (102) through a pin, so that the clamping plate (102) can be adjusted in angle under force to envelop the wind turbine main shaft. The self-locking mechanism (5) includes: a self-locking limiting block (501) and a self-locking groove (502). The front end of the self-locking groove (502) is provided with a through hole and forms a rotating pair with the limiting plate (301) through a pin (302). The bottom of the self-locking limiting block (501) is supported on the limiting plate (301). The upper end of the compression spring (7) is connected to the lower surface of the supporting beam (401), and the lower end of the compression spring (7) is connected to the upper surface of the limiting plate (301).

2. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: The roller (101) is in direct contact with the outer circle of the wind turbine main shaft to provide rolling support.

3. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: When the wind turbine main shaft is placed above the flexible support plate (201), the flexible support plate (201) will undergo a slight elastic sinking under the action of the wind turbine main shaft's own weight, thereby providing a buffer and achieving adaptive fitting for wind turbine main shafts of different diameters.

4. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: When the clamping plate limiting block (103) moves to the right along the limiting groove (303) to the position of the self-locking groove (502), the self-locking groove (502) is lifted and rotated under the force; when the clamping plate limiting block (103) reaches the limit position, the self-locking groove (502) automatically resets under the action of gravity, thereby forming a passive block, thereby realizing the passive self-locking of the clamping plate limiting block (103) and preventing the wind turbine main shaft from lifting or slipping during transportation vibration.

5. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: When the wind turbine main shaft is not placed in the self-weight bearing roller bracket, the envelope device (1) is in the open state; the spring (7) is under tension, the limiting device (3) is in the upper limit position, and the clamping plate limiting block (103) is located on the leftmost side of the limiting groove (303).

6. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: When the wind turbine main shaft is placed into the self-weight bearing roller bracket, the flexible support plate (201) supports the wind turbine main shaft and moves downward with the sleeve (304). The tension of the spring (7) gradually increases, and the limiting device (3) moves down, causing the limiting groove (303) to move down synchronously, so that the clamping plate limiting block (103) moves to the right through the sliding pair, and then through the rotating pair between the clamping plate (102) and the supporting beam (401), the upper part of the clamping plate (102) gradually envelops the wind turbine main shaft. During this process, the self-locking mechanism (5), which forms a rotating pair with the pin shaft (302) of the limiting device (3), is in working condition under the restriction of gravity and the self-locking limiting block (501); the right-moving clamping plate limiting block (103) contacts the arc-shaped extension of the self-locking groove (502), lifts it up, and the self-locking mechanism (5) switches to non-working state; then the self-locking mechanism (5) rises to the highest point and falls under the action of gravity until the self-locking limiting block (501) contacts the upper surface of the limiting groove (303) and returns to working state; at the same time, under the action of the main shaft gravity, the flexible bracket (2) and the limiting device (3) slowly move down, and the clamping plate (102) continues to envelop the main shaft; When the limiting device (3) descends to the bottom and contacts the upper surface of the bracket support vehicle (6), it stops falling. At this time, the spring (7) reaches the tension limit, the clamping plate limiting block (103) moves to the right limit position through the sliding joint, and the clamping plate (102) moves to the limit position through the rotating joint, realizing the complete envelopment of the main shaft. After the external force is removed, the main shaft maintains the envelopment effect under the action of gravity. The self-locking mechanism (5) locks the clamping plate limiting block (103) through the action of gravity and the self-locking limiting block (501) to ensure the stability of the envelopment.

7. The self-weight bearing roller bracket for ultra-large wind turbine main shaft according to claim 1, characterized in that: When the wind turbine main shaft is removed from the self-weight bearing roller bracket, the self-locking mechanism (5) needs to be switched to the non-working state by external force. As the gravity of the main shaft on the flexible support plate (201) and the limiting device (3) decreases, the upward pulling force of the spring (7) is superimposed, and the flexible support plate (201) and the limiting device (3) move upward. At this time, the clamping plate limiting block (103) is released from the self-locking restriction and moves to the left along the limiting groove (303). The clamping plate (102) rotates through the rotating pair and gradually releases the envelope of the main shaft. Finally, the main shaft is released from the flexible support plate (201) under the action of external force. The limiting device (3) and the spring (7) return to the initial position, the clamping plate limiting block (103) returns to the leftmost side of the limiting groove (303), and the envelope device (1) returns to the open state.

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