Electric power-assisted locking device for main shaft of fan

Abstract

The invention provides an electric power-assisted locking device for a main shaft of a fan, which comprises a positioning assembly which is matched with a protective shell of the fan and is detachably fixed in a groove formed in the protective shell; the braking assembly is arranged on the positioning assembly and is used for locking rotor blades of the fan; the brake assembly comprises a support, a power source and a brake mechanism. The power source is fixedly mounted on the bracket; the braking mechanism at least comprises a rotating element, braking elements are arranged at the two ends of the rotating element in a central symmetry mode, the braking elements are embedded into transverse grooves correspondingly formed in the rotating element and connected with the transverse grooves through elastic reset pieces, and the power source is coupled with the rotating element and drives the rotating element to rotate. And the two brake elements are alternately contacted with the surface of a stop disc of the fan to realize a brake function. Free movement of the fan rotor blade can be effectively prevented, and the purpose of immediate locking is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator set maintenance, and in particular to an electric power-assisted locking device for a main shaft of a wind turbine. Background Art

[0002] In the modern wind power industry, wind turbines are key energy conversion devices, and their operating efficiency directly affects the economic and sustainable use of wind energy. As an important component of directly capturing wind energy, wind turbine blades are often exposed to complex and changing atmospheric environments, and are tested by a variety of extreme conditions such as high-speed rotation, strong wind shear, freezing, and lightning strikes. Therefore, regular inspection and maintenance are essential to ensure the normal operation of wind turbines.

[0003] However, in the existing wind turbine blade maintenance process, in order to perform blade maintenance, technicians must first rotate the blade to a specific position so that they can safely approach and perform necessary maintenance tasks. This rotation process often relies on natural wind power, that is, by adjusting the wind vane and yaw system to make the blade rotate downwind until it reaches a predetermined angle. This operation mode that relies on natural wind power has two major defects:

[0004] (1) Severe environmental restrictions: In the absence of wind or weak wind, the wind alone cannot move the wind blades weighing several tons or even tens of tons, making it difficult for the blades to rotate to the required maintenance position, thereby delaying the maintenance cycle and affecting the overall availability and power generation efficiency of the wind turbine;

[0005] (2) Increased safety risks: When the wind is strong, although the blades can be easily driven to rotate, due to the lack of precise control means, the blades may rotate too quickly or unstably, posing a safety hazard to on-site workers. It is also possible that the blades themselves or other components may be damaged due to excessive rotation. Summary of the invention

[0006] The purpose of the present invention is to provide an electric power-assisted locking device for a fan main shaft in view of the deficiencies in the prior art.

[0007] The specific technical solutions are as follows:

[0008] A fan main shaft electric power-assisted locking device, comprising:

[0009] A positioning assembly adapted to the protective housing of the fan and detachably fixed in a groove provided on the protective housing; and

[0010] A brake assembly, disposed on the positioning assembly, for locking the rotor blades of the fan;

[0011] Among them, the braking assembly includes a bracket, a power source and a braking mechanism; the power source is fixedly mounted on the bracket; the braking mechanism includes at least one rotating element, and braking elements are symmetrically arranged at both ends of the rotating element, each of the braking elements is embedded in a corresponding transverse groove opened in the rotating element and connected to the rotating element through an elastic reset member, the power source is coupled to the rotating element and drives it to rotate, and when rotating, the two braking elements alternately contact the surface of the stop disc of the fan to realize the braking function.

[0012] Optionally, the positioning component includes:

[0013] a base plate, which serves as a supporting platform for the bracket; and

[0014] The locking structure includes a fixing plate, a slide plate, an elastic loading mechanism and a traction sling arranged on the base plate;

[0015] Among them, the slide plate slides along the vertical channel opened in the base plate, and constraint guide surfaces are provided on both sides of the vertical channel. The elastic loading mechanism is arranged between the slide plate and the bottom of the vertical channel. With the help of the restoring force of the elastic loading mechanism, the slide plate and the fixed plate can be embedded in the preset groove in the protective shell; one end of the traction sling is fixed to the bottom of the slide plate, and the other end extends to the bracket, so as to facilitate the manipulation of the displacement of the slide plate.

[0016] Optionally, the positioning assembly further includes an operating handle, which is fixedly connected to the top of the slide rail plate and is used to change the position of the slide rail plate in the vertical channel by directly applying force to achieve quick unlocking.

[0017] Optionally, an operation-assisting component with a pointed structure at the end is embedded in the slide rail plate, and the operation-assisting component is rigidly connected to the operating handle.

[0018] Optionally, a limiting column is provided on the inner wall of the transverse groove of the braking element to limit the nonlinear movement of the braking element in the transverse groove, thereby ensuring a smooth and controllable braking process.

[0019] Optionally, the power source includes:

[0020] A main drive unit, which is mounted on the bracket;

[0021] A speed reduction mechanism, which is connected to the output shaft of the main drive unit and adjusts the torque and speed ratio;

[0022] The torque transmission shaft is fixed to the central axis of the rotating element through a tensioning device.

[0023] Optionally, the end surface of the brake element is configured as a curved surface that matches the stop disc of the fan.

[0024] Optionally, the end surface of the brake element is provided with texture or protrusion.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The electric power-assisted locking device for the fan main shaft is designed with quick locking and disassembly of the positioning components: the use of a highly adaptable adjustable structure not only ensures the seamless fit of the device with the protective casing of fans of different models, but also greatly simplifies the installation and maintenance process, and improves the flexibility and efficiency of on-site operations; in addition, the clever combination of the braking element and the rotating element through the elastic reset part, coupled with the precise coupling of the power source and the rotating element, forms a highly efficient braking effect under the dynamic contact mode, especially the periodic "alternating" contact between the braking element and the stop disc, which effectively disperses the braking force, reduces the wear of a single contact point, and improves the durability of the braking element and the overall smoothness of the braking process.

[0027] 2. The main drive unit, the speed reduction mechanism and the torque transmission shaft work together to convert the original power of high speed and low torque into a low speed and high torque mode suitable for the actuator, ensuring that the brake element has sufficient braking force when it contacts the stop disc. At the same time, the efficient energy conversion of the speed reduction mechanism and the torque transmission shaft improves the braking response speed and control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an electric power-assisted locking device for a main shaft of a fan according to the present invention;

[0029] Figure 2 It is a side structural schematic diagram of an electric power-assisted locking device for a main shaft of a fan according to the present invention;

[0030] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0031] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at letter B;

[0032] Figure 5 It is a structural schematic diagram of various components of the base plate;

[0033] Figure 6 It is a structural schematic diagram of each component of the base plate from another perspective;

[0034] Figure 7 It is a schematic diagram of the cross-sectional structure inside the brake component.

[0035] Reference numerals:

[0036] 1. Protective shell; 10. Groove; 2. Stop disc; 3. Positioning assembly; 31. Base plate; 32. Locking structure; 321. Vertical channel; 322. Fixed plate; 323. Slide plate; 324. Elastic loading mechanism; 325. Traction rigging; 326. Operating handle; 327. Operating auxiliary component; 4. Braking assembly; 41. Bracket; 42. Power source; 421. Main drive unit; 422. Speed ​​reduction mechanism; 423. Torque transmission shaft; 424. Tensioning device; 43. Braking mechanism; 431. Rotating element; 432. Braking element; 433. Transverse groove; 434. Elastic reset member; 435. Limiting column; 5. Rotor blade. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0040] The fan main shaft electric booster locking device provided in the present invention refers to Figure 1-Figure 7 ,include:

[0041] A positioning assembly 3 adapted to the protective housing 1 of the fan and detachably fixed in a groove 10 provided on the protective housing 1; and

[0042] A brake assembly 4, disposed on the positioning assembly 3, for locking the rotor blades 5 of the fan;

[0043] Among them, the braking assembly 4 includes a bracket 41, a power source 42 and a braking mechanism 43; the power source 42 is fixedly installed on the bracket 41; the braking mechanism 43 includes at least one rotating element 431, and braking elements 432 are symmetrically arranged at both ends of the rotating element 431. Each braking element 432 is embedded in a corresponding transverse groove 433 opened in the rotating element 431 and is connected to the rotating element 431 through an elastic reset member 434. The power source 42 is coupled to the rotating element 431 and drives it to rotate. When rotating, the braking element 432 is in close contact with the surface of the stop disc 2 of the fan to realize the braking function.

[0044] Among them, the positioning assembly 3 is arranged in the fan protection housing 1 to ensure that the device can be firmly and conveniently installed in its designated position; specifically, this embodiment adopts a structure that can be quickly locked and disassembled, so that it can adapt to the subtle differences of fan housings of different models and achieve gapless fit. Specifically, the power source 42 is firmly fixed on a special bracket 41, which not only provides a solid support point, but also reserves enough space for wiring and heat dissipation to ensure the continuous and stable operation of the motor. The rotating element 431 can be set as a rotating rod, which is forged with high-quality alloy steel and has extremely high wear resistance and fatigue resistance. The two ends of the rotating element 431 are symmetrically provided with transverse grooves 433 about the central axis of the rotating element 431 (the position of the rotating rod and the power output shaft of the power source 42) to accommodate the brake element 432. Each brake element 432 is an independent module made of hard alloy material, embedded in the groove and connected to the rotating element 431 through a high-strength spring.

[0045] When the brake command is triggered, the power source 42 drives the rotating element 431 to rotate. At this time, due to the centrifugal force, the two brake elements 432 are pushed out of the transverse groove 433 and contact the surface of the fan stop disc 2. Initially, the brake element 432 may only lightly touch the stop disc 2, but due to the preload effect of the elastic reset member 434 (set as a spring in this embodiment), as the rotation speed increases, the brake element 432 gradually increases the pressing force on the stop disc 2, forming an increasingly large friction force until it is sufficient to overcome the rotational kinetic energy of the fan rotor blade 5 and slowly and steadily bring it into a stopped state, thereby effectively preventing the fan rotor blade 5 from moving freely and achieving the purpose of instant locking. In addition, it is worth noting that the contact between the brake element 432 and the stop disc 2 is not static, but exhibits a periodic "alternating" feature. This is because the extension and retraction of the brake element 432 follows the rotation rhythm of the rotating element 431. This dynamic contact mode helps to disperse the braking force and avoid excessive impact at a single point. It is also beneficial to heat dissipation and extends the service life of the brake element 432.

[0046] In addition, in this embodiment, refer to Figure 6-Figure 7 , the power source 42 comprises:

[0047] A main drive unit 421, which is mounted on the bracket 41, and can be a servo motor or an electric motor;

[0048] The speed reduction mechanism 422 is connected to the output shaft of the main drive unit 421, and converts the original power of high speed and low torque into a low speed and high torque mode suitable for the actuator; it is usually implemented by a gear box, a worm gear or a planetary gear reducer, which can effectively reduce the high speed of the power source 42 to a suitable range, and at the same time greatly increase the output torque, ensuring that the brake element 432 has sufficient braking force when it contacts the stop disc 2;

[0049] One end of the torque transmission shaft 423 is tightly connected to the output shaft of the speed reduction mechanism 422, and the other end passes through the central hole of the rotating element 431 and is connected to the tensioning device 424 (such as a tensioning sleeve). The tensioning device 424 ensures that the torque transmission shaft 423 can maintain the minimum radial clearance under any working state through the pre-set pressure, avoids the torque loss caused by axial movement, ensures the efficient and delay-free transmission of the torque to the braking element 432, and greatly improves the reaction speed and control accuracy of the locking device, so that it can respond quickly and implement braking in time when facing emergencies, ensuring the safe and stable operation of the fan.

[0050] In addition, the device is also equipped with an intelligent control system electrically connected to the deceleration unit. The system integrates a sensor network and algorithm logic. It can not only monitor the real-time operating parameters of the fan, but also automatically adjust the braking timing and strength according to changes in external conditions, greatly enhancing the intelligence and response speed of the device.

[0051] In this embodiment, refer to Figure 3-Figure 5 , the positioning component 3 includes:

[0052] A base plate 31, serving as a support platform for the bracket 41; and

[0053] The locking structure 32 includes a fixing plate 322, a slide plate 323, an elastic loading mechanism 324 and a traction sling 325 disposed on the base plate 31;

[0054] Among them, the slide plate 323 slides along the vertical channel 321 opened in the base plate 31, and constraint guide surfaces are provided on both sides of the vertical channel 321. The elastic loading mechanism 324 is provided between the slide plate 323 and the bottom of the vertical channel 321. With the help of the restoring force of the elastic loading mechanism 324, the slide plate 323 and the fixed plate 322 can be embedded in the preset groove 10 in the protective shell 1; one end of the traction sling 325 is fixed to the bottom of the slide plate 323, and the other end extends on the bracket 41, which is convenient for manipulating the displacement of the slide plate 323.

[0055] Among them, the material of the fixed plate 322 is preferably high-strength aluminum alloy, which is both lightweight and strong, and can withstand mechanical loads under complex working conditions. Its shape is L-shaped, one end is fixed on the base plate 31, and the other end is clamped on the lower end surface of the preset groove 10 in the protective shell 1; the slide plate 323 is the core component for realizing the positioning function, and its shape is Z-shaped, and the size is customized according to the specific specifications of the groove 10 of the protective shell 1 to ensure the fit between the two; the slide plate 323 can slide up and down along the vertical channel 321 pre-opened in the base plate 31, and the constraint guide surfaces on both sides of the vertical channel 321 are intended to guide the slide plate 323 to move smoothly while limiting its lateral displacement to ensure the accuracy and reliability of the action. The elastic loading mechanism 324 is usually made of a spring or elastic polymer material with a high compression ratio. When the slide plate 323 is pushed by an external force, the elastic loading mechanism 324 begins to compress and store energy; when the external force is removed, the stored energy is released instantly, causing the slide plate 323 to rebound quickly. Relying on its potential energy and the assistance of the guide surface, the slide plate 323 and the fixed plate 322 can be accurately embedded in the relative positions of the groove 10 in the protective shell 1, forming a locking of the base plate 31, and the bracket 41 is arranged on the base plate 31, thereby further ensuring the stability of the bracket 41 and the components on the bracket 41. The traction sling 325 can be set as a steel cable. By pulling the traction sling 325, the operator can directly control the displacement of the slide plate 323, so that the entire positioning assembly 3 can smoothly enter or exit the groove 10 on the protective shell 1, which greatly facilitates the installation and disassembly process of the equipment. Therefore, the positioning assembly 3 mainly utilizes the energy storage and release effect of the elastic loading mechanism 324 and cooperates with the guiding mechanism of the slide rail plate 323 to achieve automatic engagement with the protective housing 1 .

[0056] The specific steps are as follows: without the influence of external force, the elastic loading mechanism 324 maintains a natural state, and the slide plate 323 is located at the highest point of the vertical channel 321. At this time, the positioning assembly 3 is in a standby state, waiting for instructions; by pulling the traction sling 325, the operator applies a downward pulling force to the slide plate 323, overcomes the resistance of the elastic loading mechanism 324, forces the slide plate 323 to move upward to the vicinity of the top of the vertical channel 321, and inserts one end of the slide plate 323 into the groove 10; then release the traction sling 325, and the energy accumulated in the elastic loading mechanism 324 is quickly released, pushing the slide plate 323 to accelerate upward until it perfectly fits with the groove 10 of the protective housing 1, completing a positioning operation. Pull the traction sling 325 again, repeat the second step, so that the slide plate 323 is separated from the groove 10 and restored to the initial position, which is convenient for the next step of maintenance or disassembly. Therefore, the device of the present invention not only simplifies the installation process of the electric power-assisted locking device of the fan main shaft, but also significantly enhances its applicability and maintenance convenience.

[0057] Specifically, refer to Figure 5The positioning assembly 3 also includes an operating handle 326, which is fixedly connected to the top of the slide plate 323. The position of the slide plate 323 in the vertical channel 321 is changed by directly applying force. Its design purpose is to provide an intuitive interface so that the operator can directly apply force to the slide plate 323 to accurately control its position change in the vertical channel 321. This makes the unlocking process simple and direct, and is no longer limited by indirect control methods (such as traction slings 325). Especially when the operating space is limited or a quick response is required, the advantages of the operating handle 326 are more obvious. The slide plate 323 is embedded with an operating aid component 327 with a pointed structure at the end. The operating aid component 327 is rigidly connected to the operating handle 326 to form an effective lever arm extension structure. When the operator applies force through the operating handle 326, the pointed structure of the operating aid component 327 can significantly amplify the applied force, and can more easily overcome the resistance of the elastic loading mechanism 324, thereby making the displacement of the slide plate 323 in the vertical channel 321 more labor-saving, and can achieve quick unlocking even under high load conditions, further improving the working efficiency of the operating handle 326 and reducing the operator's physical exertion.

[0058] Specifically, refer to Figure 6-Figure 7The inner wall of the transverse groove 433 of the brake element 432 is provided with a limiting column 435 to limit the nonlinear movement of the brake element 432 in the transverse groove 433, so as to ensure the stability and controllability of the braking process. The limiting column 435 is a small protruding structure, usually made of high-strength material, fixed on the inner wall of the transverse groove 433 of the brake element 432, and arranged parallel to the length direction of the transverse groove 433. During actual installation, the elastic reset member 434 (spring) mentioned above can be fixedly sleeved on the limiting column 435, one end of which is fixedly connected to the inner wall of the transverse groove 433, and the other end is fixedly connected to the brake element 432. The end of the brake element 432 close to the limiting column 435 is provided with a linear sliding groove for accommodating the limiting column 435, thereby limiting the nonlinear (i.e., not parallel to the length direction of the transverse groove 433) displacement of the brake element 432 in the groove, thereby preventing the brake element 432 from unnecessary lateral displacement or vibration due to external force, and ensuring that the brake element 432 always moves along the predetermined track. When the brake element 432 is driven by the power source 42 to perform a braking action, it will produce a linear reciprocating motion in the transverse groove 433. If there is no appropriate limiting measure, the brake element 432 may deviate from the ideal trajectory due to the influence of factors such as friction and inertia, resulting in an unstable braking process, and even abnormal wear of the brake element 432 and other components, reducing the braking efficiency. The existence of the limiting column 435 just makes up for this deficiency. Whenever the brake element 432 approaches the edge of the groove wall during movement, the limiting column 435 will contact it and produce a slight obstruction. This obstruction does not completely prevent the brake element 432 from continuing to move, but plays a guiding role, prompting the brake element 432 to return to the normal linear motion track, avoiding nonlinear lateral sliding, and thus ensuring the stability of the braking process and the accuracy of the operation of the brake element 432.

[0059] In this embodiment, refer to Figure 4 The end surface of the brake element 432 is set as a curved surface that matches the stop disc 2 of the fan. On the one hand, the contact area can be increased. By expanding the actual contact range between the brake element 432 and the stop disc 2, the pressure can be evenly distributed, the local stress concentration can be reduced, and the hot spot phenomenon can be avoided during the braking process, thereby improving the braking efficiency and stability; on the other hand, the curved surface fit can ensure that the brake element 432 always maintains the optimal angle to contact the stop disc 2 throughout the braking stroke, and even under high-speed rotation conditions, a smooth and efficient braking effect can be achieved, reducing the risk of braking failure caused by poor contact. In addition, the end surface of the brake element 432 is provided with textures or protrusions. These tiny but dense textures or protrusions can form countless tiny bite points at the moment when the brake element 432 contacts the stop disc 2, greatly enhancing the grip between the two, and ensuring sufficient braking force even in a slippery or dusty environment.

[0060] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric power-assisted locking device for a fan main shaft, characterized in that: include A positioning assembly adapted to the protective housing of the fan and detachably fixed in a groove provided on the protective housing; and A brake assembly, disposed on the positioning assembly, for locking the rotor blades of the fan; Among them, the braking assembly includes a bracket, a power source and a braking mechanism; the power source is fixedly mounted on the bracket; the braking mechanism includes at least one rotating element, and braking elements are symmetrically arranged at both ends of the rotating element, each of the braking elements is embedded in a corresponding transverse groove opened in the rotating element and connected to the rotating element through an elastic reset member, the power source is coupled to the rotating element and drives it to rotate, and when rotating, the two braking elements alternately contact the surface of the stop disc of the fan to realize the braking function.

2. The electric power-assisted locking device for the fan main shaft according to claim 1, characterized in that: The positioning component comprises: a base plate, which serves as a supporting platform for the bracket; and The locking structure includes a fixing plate, a slide plate, an elastic loading mechanism and a traction sling arranged on the base plate; Among them, the slide plate slides along the vertical channel opened in the base plate, and constraint guide surfaces are provided on both sides of the vertical channel. The elastic loading mechanism is arranged between the slide plate and the bottom of the vertical channel. With the help of the restoring force of the elastic loading mechanism, the slide plate and the fixed plate can be embedded in the preset groove in the protective shell; one end of the traction sling is fixed to the bottom of the slide plate, and the other end extends to the bracket, so as to facilitate the manipulation of the displacement of the slide plate.

3. The electric power-assisted locking device for the fan main shaft according to claim 2, characterized in that: The positioning assembly also includes an operating handle, which is fixedly connected to the top of the slide rail plate and can change the position of the slide rail plate in the vertical channel by directly applying force to achieve rapid unlocking.

4. The electric power-assisted locking device for the fan main shaft according to claim 3 is characterized in that: An operation-assisting component with a pointed structure at the end is embedded in the slide rail plate, and the operation-assisting component is rigidly connected to the operating handle.

5. The electric power-assisted locking device for the fan main shaft according to claim 1, characterized in that: The inner wall of the transverse groove of the brake element is provided with a limiting column to limit the nonlinear movement of the brake element in the transverse groove, thereby ensuring the stability and controllability of the braking process.

6. The electric power-assisted locking device for the fan main shaft according to claim 1, characterized in that: The power source comprises: A main drive unit, which is mounted on the bracket; A speed reduction mechanism, which is connected to the output shaft of the main drive unit and adjusts the torque and speed ratio; The torque transmission shaft is fixed to the central axis of the rotating element through a tensioning device.

7. The electric power-assisted locking device for the fan main shaft according to claim 1, characterized in that: The end surface of the brake element is configured as a curved surface that matches the stop disc of the fan.

8. The electric power-assisted locking device for the fan main shaft according to claim 1, characterized in that: The end surface of the brake element is provided with textures or protrusions.

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