A wind turbine blade root variable speed telescoping device and method of use

Abstract

The application discloses a wind turbine blade root variable-speed telescopic device and a use method thereof. The device is provided with a plurality of devices arranged at the connecting position of the hub of the wind turbine and the blade root. Each device corresponds to a blade root. The device comprises a center rod, a load bearing bearing disc, a sliding rod frame, a sliding rod driving device, a variable-speed connecting rod device and a shock absorbing seat device. The center rod penetrates through the load bearing bearing disc and is in sliding connection with the load bearing bearing disc. The load bearing bearing disc is connected with the blade root of the wind turbine. The sliding rod frame and the shock absorbing seat device are respectively installed at the two end portions of the center rod. Each free end of the sliding rod frame is provided with a sliding groove. The sliding rod driving device is installed in each sliding groove. The sliding rod driving device is connected with the load bearing bearing disc through the variable-speed connecting rod device. The variable-speed reciprocating motion of the load bearing bearing disc is controlled by switching the variable-speed connecting rod device through the sliding rod driving device. The variable-speed telescopic storage of the single blade root is realized through mechanical transmission. The maintenance of the blade maintenance personnel is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine hub and blade transmission, in particular to a wind turbine blade root variable speed telescopic device and a use method thereof. BACKGROUND

[0002] In the prior art, the hub is generally used as a component for connecting and bearing the gravity and wind load of the blade, and only a variable pitch driving motor can be arranged to realize the variable pitch function of the blade. The structure and function of the hub are relatively simple. The wind wheel diameter of the blade is generally assembled according to the structural characteristics, and the diameter of the wind wheel blade is also constant after the complete assembly of the whole machine. In the case of extremely severe wind conditions in the natural environment, the wind turbine will not generate electricity when the wind speed is greater than the cut-out wind speed. Since the diameter of the wind wheel cannot be changed, the large windward area will cause the blade to bear excessive wind load, which may cause the blade to break and be damaged. In the current operation process of the wind turbine, the connection at the blade root bears a large limit and fatigue load. In the maintenance process of the blade and the variable pitch system, the structural characteristics of the blade root part make it difficult for maintenance personnel to effectively check and maintain the part. After long-term operation, the blade root part may have problems such as wear and corrosion. If these problems are not found and treated in time, the performance and safety of the wind turbine may be affected. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provides a wind turbine blade root variable speed telescopic device and a use method thereof. The single blade root is telescoped by mechanical transmission, which avoids damage to the wind turbine blade in extreme conditions and facilitates maintenance by blade maintenance personnel. At the same time, the variable speed telescopic function is provided, and the speed of telescopic start can be controlled.

[0004] The present application is achieved by the following technical scheme: a wind turbine blade root variable speed telescopic device, which has a plurality of devices arranged at the connection between the hub of the wind turbine and the blade root. Each device corresponds to a blade root. The device comprises a center rod, a load bearing bearing disc, a slide rod holder, a slide rod driving device, a variable speed connecting rod device and a shock absorbing seat device. The center rod passes through the load bearing bearing disc and forms a sliding connection with the load bearing bearing disc. The load bearing bearing disc is connected with the blade root of the wind turbine. The slide rod holder and the shock absorbing seat device are respectively installed at the two end portions of the center rod. Each free end of the slide rod holder is provided with a sliding groove. The slide rod driving device is installed in each sliding groove. The slide rod driving device is connected with the load bearing bearing disc through the variable speed connecting rod device. The variable speed of the load bearing bearing disc is controlled by switching the variable speed connecting rod device through the slide rod driving device.

[0005] Further, the outer wall of the center rod is formed with a sliding rail, and the middle part of the load bearing bearing disc is formed with a sliding rail mounting position for mounting the center rod, the center rod passes through the sliding rail mounting position of the load bearing bearing disc, so that the load bearing bearing disc matches with the sliding rail of the center rod and forms a sliding connection.

[0006] Further, the free end of each sliding rod frame corresponds to a sliding rail of the center rod, the number of the free ends of the sliding rod frames is the same as the number of the sliding rails of the center rods, and the free ends of the sliding rod frames are symmetrically arranged and perpendicular to the center rod.

[0007] Further, the sliding rod frame is a cross-shaped sliding rod frame.

[0008] Further, the variable speed connecting rod device comprises a lower folding rod, a middle straight rod, an upper folding rod and a rod penetrating pin, one end of the lower folding rod, the middle straight rod and the upper folding rod is connected with the sliding rod driving device, the rod penetrating pin passes through the other end of the lower folding rod, the middle straight rod and the upper folding rod in turn, and forms a movable connection with the lower folding rod, the middle straight rod and the upper folding rod.

[0009] Further, the lower folding rod is folded towards the center rod, and the folding angle is 120°; the upper folding rod is folded in the opposite direction of the lower folding rod, and the folding angle is 120°.

[0010] Further, the variable speed connecting rod device further comprises a support, and the two ends of the rod penetrating pin are installed at the support, so that the whole variable speed connecting rod device is pulled by the support.

[0011] Further, the support is a U-shaped support.

[0012] Further, the shock absorbing seat device comprises a connecting disc and a shock absorbing spring, and the connecting disc is arranged at the two ends of the shock absorbing spring respectively, one of the connecting discs is connected with the end of the center rod for buffering the impact of the load bearing bearing disc.

[0013] A use method of the wind turbine blade root variable speed telescopic device, comprising:

[0014] When the sliding groove is close to the lower folding rod, the lower folding rod is a driving part, and the middle straight rod and the upper folding rod are driven parts, when the sliding rod driving device moves away from the center rod, the load bearing bearing disc moves upwardly and slowly towards the shock absorbing seat device, so that the wind turbine blade root connected with the load bearing bearing disc slowly extends; when the sliding rod driving device moves towards the center rod, the load bearing bearing disc moves downwardly and slowly towards the sliding rod frame, so that the wind turbine blade root connected with the load bearing bearing disc slowly retracts;

[0015] When the sliding groove is sleeved on the middle straight rod, the middle straight rod is a driving member, and the lower folding rod and the upper folding rod are driven members, when the sliding rod driving device moves away from the center rod, the load bearing disc moves upward at a uniform speed towards the shock absorbing seat device, so that the wind turbine blade root connected by the load bearing disc extends at a uniform speed; when the sliding rod driving device moves towards the center rod, the load bearing disc moves downward at a uniform speed towards the sliding rod frame, so that the wind turbine blade root connected by the load bearing disc retracts at a uniform speed.

[0016] When the sliding groove is sleeved on the upper folding rod, the upper folding rod is a driving member, and the middle straight rod and the lower folding rod are driven members, when the sliding rod driving device moves away from the center rod, the load bearing disc moves upward at a fast speed towards the shock absorbing seat device, so that the wind turbine blade root connected by the load bearing disc extends at a fast speed; when the sliding rod driving device moves towards the center rod, the load bearing disc moves downward at a fast speed towards the sliding rod frame, so that the wind turbine blade root connected by the load bearing disc retracts at a fast speed.

[0017] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0018] 1. The present application can stably realize the lifting and retraction movement of the load bearing disc, improve the adaptability of the device, and increase the functionality of the variable speed connecting rod design;

[0019] 2. The present application can realize variable speed function: through the multi-gear connecting rod design, the driving device switching rod realizes slow, uniform and fast three variable speed extension and retraction movement;

[0020] 3. The present application can realize the blade extension and retraction function: through the design of the center rod sliding rail and the load bearing disc, the load bearing disc is driven to extend and retract by mechanical transmission, and the blade root is driven to extend and retract;

[0021] 4. The mechanical transmission device structure of the structural components of the present application is simple, can be adjusted according to different variable pitch straight sizes, so that the hub has the function of variable speed extension and retraction of the blade, is convenient for regular manual inspection, and ensures the safety of the maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a structural schematic view of the wind turbine blade root variable speed extension and retraction device.

[0023] Fig. 2 It is a structural top view of the wind turbine blade root variable speed extension and retraction device.

[0024] Fig. 3 It is a partial enlarged view of the variable speed connecting rod device and the load bearing disc connection structure.

[0025] Fig. 4 It is a partial enlarged view of the variable speed connecting rod device and the sliding rod frame connection structure. DETAILED DESCRIPTION

[0026] The application will be further described in connection with the specific embodiments.

[0027] Embodiment 1

[0028] Referring to Figs. 1 to 4 As shown in the drawings, the wind turbine blade root variable speed telescopic device provided by the embodiment has a plurality of devices arranged at the connection between the hub of the wind turbine and the blade root, each device corresponding to a blade root, the device comprising a central rod 1, a load bearing bearing disc 2, a slide rod holder 3, a slide rod driving device 4, a variable speed connecting rod device 5 and a shock absorbing seat device 6;

[0029] The central rod 1 passes through the load bearing bearing disc 2 and forms a sliding connection with the load bearing bearing disc 2, the load bearing bearing disc 2 is connected with the blade root of the wind turbine, and the load bearing bearing disc 2 also serves as the variable pitch bearing disc of the wind turbine blade, the slide rod holder 3 and the shock absorbing seat device 6 are respectively installed at the two end portions of the central rod 1, each free end of the slide rod holder 3 is provided with a sliding groove, the slide rod driving device 4 is installed in each sliding groove, the slide rod driving device 4 is connected with the load bearing bearing disc 2 through the variable speed connecting rod device 5, and the variable speed reciprocating motion of the load bearing bearing disc 2 is controlled by switching the variable speed connecting rod device 5 through the slide rod driving device 4; the slide rod driving device 4 can adopt a commonly used axial motion device, such as a pneumatic cylinder, a hydraulic cylinder, a linear motor, etc., and provides linear reciprocating power.

[0030] The outer wall of the central rod 1 is formed with a sliding rail, the middle part of the load bearing bearing disc 2 is formed with a sliding rail mounting position for mounting the central rod 1, the central rod 1 passes through the sliding rail mounting position of the load bearing bearing disc 2, so that the load bearing bearing disc 2 matches the sliding rail of the central rod 1 and forms a sliding connection; the slide rod holder 3 is a cross-shaped slide rod holder, each free end of each slide rod holder 3 corresponds to a sliding rail of the central rod 1, the number of free ends of the slide rod holder 3 is the same as the number of sliding rails of the central rod 1, the free ends of each slide rod holder 3 are symmetrically arranged and perpendicular to the central rod 1;

[0031] The variable speed connecting rod device 5 comprises a lower folding rod 7, a middle straight rod 8, an upper folding rod 9, a rod passing pin 10 and a U-shaped support 11; the lower folding rod 7 is bent towards the central rod 1, and the bending angle is 120°; the upper folding rod 9 is opposite to the bending direction of the lower folding rod 7, and the bending angle is 120°; one end of the lower folding rod 7, the middle straight rod 8 and the upper folding rod 9 is connected with the slide rod driving device 4, the rod passing pin 10 passes through the other end of the lower folding rod 7, the middle straight rod 8 and the upper folding rod 9 in sequence and forms a movable connection with the lower folding rod 7, the middle straight rod 8 and the upper folding rod 9, and the two ends of the rod passing pin 10 are installed at the U-shaped support 11, so that the whole variable speed connecting rod device 5 is pulled through the U-shaped support 11;

[0032] The damping seat device 6 comprises a connecting disc and damping springs; the connecting discs are respectively arranged at two ends of the damping springs, one of which is connected with the end of the central rod 1 for buffering the impact of the load bearing bearing disc 2.

[0033] Embodiment 2

[0034] The use method of the wind turbine blade root variable speed telescopic device provided by the embodiment 1 comprises:

[0035] When the sliding groove sleeve is close to the lower folding rod 7, the lower folding rod 7 is the driving part, the middle straight rod 8 and the upper folding rod 9 are the driven parts, when the sliding rod driving device 4 moves away from the central rod 1, the load bearing bearing disc 2 makes a slow lifting movement towards the damping seat device 6, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly extends; when the sliding rod driving device 4 moves towards the central rod 1, the load bearing bearing disc 2 makes a slow descending movement towards the sliding rod frame 3, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly retracts;

[0036] When the sliding groove sleeve is close to the lower folding rod 7, the lower folding rod 7 is the driving part, the middle straight rod 8 and the upper folding rod 9 are the driven parts, when the sliding rod driving device 4 moves away from the central rod 1, the load bearing bearing disc 2 makes a slow lifting movement towards the damping seat device 6, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly extends; when the sliding rod driving device 4 moves towards the central rod 1, the load bearing bearing disc 2 makes a slow descending movement towards the sliding rod frame 3, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly retracts;

[0037] When the sliding groove sleeve is close to the lower folding rod 7, the lower folding rod 7 is the driving part, the middle straight rod 8 and the upper folding rod 9 are the driven parts, when the sliding rod driving device 4 moves away from the central rod 1, the load bearing bearing disc 2 makes a slow lifting movement towards the damping seat device 6, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly extends; when the sliding rod driving device 4 moves towards the central rod 1, the load bearing bearing disc 2 makes a slow descending movement towards the sliding rod frame 3, so that the wind turbine blade root connected with the load bearing bearing disc 2 slowly retracts;

[0038] The above-mentioned embodiments are only the preferred embodiments of the present application, and do not limit the scope of the present application, so that any changes made according to the shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A wind turbine blade root speed-variable telescopic device, characterized by: The device has multiple components and is arranged at the connection between the hub of the wind turbine and the blade root, each component corresponding to a blade root. The device comprises a central rod (1), a load-bearing bearing disc (2), a slide rod frame (3), a slide rod driving device (4), a speed-changing connecting rod device (5) and a shock-absorbing seat device (6); the central rod (1) passes through the load-bearing bearing disc (2) and forms a sliding connection with the load-bearing bearing disc (2); the load-bearing bearing disc (2) is connected to the blade root of the wind turbine; the slide rod frame (3) and the shock-absorbing seat device (6) are connected to the blade root of the wind turbine; The vibration seat device (6) is respectively installed at the two ends of the center rod (1), and each free end of the slide rod frame (3) is provided with a sliding groove. The slide rod driving device (4) is installed in each sliding groove. The slide rod driving device (4) is connected to the load-bearing bearing disk (2) through the speed change connecting rod device (5). The speed change connecting rod device (5) is switched by the slide rod driving device (4) to control the speed change reciprocating motion of the load-bearing bearing disk (2); the speed change connecting rod device (5) includes a lower folding rod (7), a middle straight rod (8) , an upper folding rod (9) and a through-rod pin (10); one end of the lower folding rod (7), the middle straight rod (8) and the upper folding rod (9) are connected to the slide rod driving device (4), and the through-rod pin (10) passes through the other ends of the lower folding rod (7), the middle straight rod (8) and the upper folding rod (9) in sequence, and forms a movable connection with the lower folding rod (7), the middle straight rod (8) and the upper folding rod (9); the lower folding rod (7) is bent toward the center rod (1), and its bending angle is 120°; the upper folding rod ( 9) is bent in the opposite direction to the lower folding rod (7), and its bending angle is 120°; when the sliding groove is sleeved close to the lower folding rod (7), the lower folding rod (7) is the driving member, and the middle straight rod (8) and the upper folding rod (9) are the driven members; when the sliding groove is sleeved on the middle straight rod (8), the middle straight rod (8) is the driving member, and the lower folding rod (7) and the upper folding rod (9) are the driven members; when the sliding groove is sleeved on the upper folding rod (9), the upper folding rod (9) is the driving member, and the middle straight rod (8) and the lower folding rod (7) are the driven members.

2. The wind turbine blade root speed-variable telescopic device according to claim 1, characterized in that: The outer wall of the center rod (1) is formed with a slide rail, and the middle part of the load-bearing bearing disc (2) is formed with a slide rail installation position for installing the center rod (1). The center rod (1) passes through the slide rail installation position of the load-bearing bearing disc (2), so that the load-bearing bearing disc (2) and the slide rail of the center rod (1) are matched and form a sliding connection.

3. The wind turbine blade root speed-variable telescopic device according to claim 2, characterized in that: The free end of each slide rod frame (3) corresponds to a slide rail of the center rod (1), the number of the free ends of the slide rod frames (3) is the same as the number of the slide rails of the center rod (1), and the free ends of the slide rod frames (3) are symmetrically arranged and perpendicular to the center rod (1).

4. The wind turbine blade root speed-variable telescopic device according to claim 3, characterized in that: The slide rod frame (3) is a cross-shaped slide rod frame.

5. The wind turbine blade root speed-variable telescopic device according to claim 1, characterized in that: The speed change connecting rod device (5) further includes a bracket (11); both ends of the through-rod pin (10) are mounted on the bracket (11), so that the speed change connecting rod device (5) as a whole is pulled through the bracket (11).

6. The wind turbine blade root speed-variable telescopic device according to claim 5, characterized in that: The bracket (11) is a U-shaped bracket.

7. The wind turbine blade root speed-variable telescopic device according to claim 1, characterized in that: The shock-absorbing seat device (6) comprises a connecting disc and a shock-absorbing spring; the connecting discs are respectively arranged at both ends of the shock-absorbing spring, and one of the connecting discs is connected to the end of the center rod (1) to buffer the impact of the load-bearing bearing disc (2).

8. A method for using the wind turbine blade root speed-variable telescopic device according to any one of claims 1 to 7, characterized in that: include: When the sliding groove sleeve is close to the lower folding rod (7), the lower folding rod (7) is the driving member, and the middle straight rod (8) and the upper folding rod (9) are the driven members. When the sliding rod driving device (4) moves in a direction away from the center rod (1), the load-bearing bearing disc (2) moves slowly upward toward the shock-absorbing seat device (6), so that the blade root of the wind turbine connected to the load-bearing bearing disc (2) is slowly extended; when the sliding rod driving device (4) moves in a direction close to the center rod (1), the load-bearing bearing disc (2) moves slowly downward toward the sliding rod frame (3), so that the blade root of the wind turbine connected to the load-bearing bearing disc (2) is slowly retracted; When the sliding groove is sleeved on the middle straight rod (8), the middle straight rod (8) is the driving member, and the lower folding rod (7) and the upper folding rod (9) are the driven members. When the sliding rod driving device (4) moves in a direction away from the center rod (1), the load-bearing bearing disc (2) moves at a uniform speed toward the shock-absorbing seat device (6), thereby causing the blade root of the wind turbine connected to the load-bearing bearing disc (2) to extend at a uniform speed; when the sliding rod driving device (4) moves in a direction close to the center rod (1), the load-bearing bearing disc (2) moves at a uniform speed toward the sliding rod frame (3), thereby causing the blade root of the wind turbine connected to the load-bearing bearing disc (2) to retract at a uniform speed; When the sliding groove is sleeved on the upper folding rod (9), the upper folding rod (9) is a driving member, and the middle straight rod (8) and the lower folding rod (7) are driven members. When the sliding rod driving device (4) moves in a direction away from the center rod (1), the load-bearing bearing disc (2) moves upward and rapidly toward the shock-absorbing seat device (6), thereby allowing the blade root of the wind turbine connected to the load-bearing bearing disc (2) to extend rapidly; when the sliding rod driving device (4) moves in a direction close to the center rod (1), the load-bearing bearing disc (2) moves downward and rapidly toward the sliding rod frame (3), thereby allowing the blade root of the wind turbine connected to the load-bearing bearing disc (2) to retract rapidly.

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