A type of leaf safety lock
By using the limiting groove and the stop column of the blade safety lock, the problem of the blade locking device being unable to be reliably fixed in strong winds or emergencies is solved, thus achieving the stability and safety of the pitch bearing and simplifying the maintenance process of the wind turbine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PINGGAO GROUP ENERGY DEVELOPMENT CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-06-30
AI Technical Summary
In existing technologies, blade locking devices are difficult to quickly and reliably fix blades in strong winds or emergencies, and cannot effectively prevent blade rotation, leading to equipment damage and safety hazards. At the same time, they lack an effective design to prevent pitch bearing misalignment, which increases maintenance difficulty and risk.
A blade safety lock was designed, which achieves the locking function through the cooperation of the limiting groove on the lock body and the stop on the lock tongue. The lock body is detachably connected to the wheel hub casting, and the lock tongue is detachably connected to the pitch bearing. The pure mechanical structure does not require an additional power source or complex control mechanism, and ensures that the stop accurately enters the limiting groove to prevent the pitch bearing from rotating unexpectedly.
It effectively prevents unexpected rotation of the pitch bearing, improves blade safety, is easy and reliable to operate, is suitable for wind turbines of different specifications, reduces equipment failure and safety risks, and simplifies the maintenance process.
Smart Images
Figure CN224432706U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind power generation maintenance, and more specifically to a blade safety lock. Background Technology
[0002] In the field of wind power generation, ensuring the stability and safety of wind turbine blades under various operating conditions is crucial. While various blade locking devices exist in the current technology, many shortcomings remain to be addressed. Traditional locking devices struggle to quickly and reliably secure blades in high winds or emergencies, failing to effectively prevent damage to the wind turbine due to uncontrolled blade rotation. This not only leads to equipment failure and increased maintenance costs but may also endanger the safety of surrounding personnel, posing a significant challenge to the stable operation of wind turbines.
[0003] Meanwhile, during routine maintenance of wind turbines, especially when replacing critical components such as pitch motors or pitch reducers, existing technology lacks effective locking mechanisms to prevent pitch bearing misalignment. This leads to inaccurate gear reset, increasing the difficulty and risk of maintenance, and may even result in mechanical injuries caused by bearing misalignment.
[0004] The lack of effective designs in the existing technology specifically for preventing pitch bearing misalignment makes it difficult to ensure the stability and accuracy of pitch bearings in actual operation, especially during emergencies or equipment maintenance, thus affecting the overall safety and reliability of wind turbine units.
[0005] Therefore, how to provide a new blade safety lock that is easy to install while effectively preventing pitch bearing misalignment is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0006] In view of this, the present invention provides a blade safety lock, which aims to solve the technical problem of safety hazards caused by the lack of a fixing device to prevent pitch bearing misalignment during the daily maintenance of the aforementioned wind turbines.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A blade safety lock, comprising an annular hub casting and a pitch bearing rotatably connected to the inner annular surface of the hub casting, arranged within the nacelle of a wind turbine, including:
[0009] The lock body has a first end that is detachably connected to the end face of the wheel hub casting, and a second end that protrudes from the inner ring surface of the wheel hub casting and is located above the end face of the pitch bearing, and has a limiting groove with its opening direction facing the rear of the rotation direction of the pitch bearing.
[0010] The locking tongue is detachably connected to the end face of the pitch bearing. The locking tongue is provided with a stop post arranged opposite to the limiting groove. The stop post enters the limiting groove as the pitch bearing rotates to lock the pitch bearing.
[0011] Through the above technical solution, this utility model blade safety lock achieves its locking function through the cooperation of a limiting groove on the lock body and a stop pin on the lock tongue. The lock body is detachably connected to the hub casting, facilitating installation and maintenance and offering strong versatility. The limiting groove precisely corresponds to the rotation trajectory of the pitch bearing, ensuring that the stop pin smoothly enters the limiting groove, avoiding jamming and damage, effectively preventing unexpected rotation of the pitch bearing, and improving blade safety. This design requires no additional power source or complex control mechanism, is simple to operate, and provides reliable locking.
[0012] Preferably, the lock body includes a fixed plate, a first connecting plate, a baffle, and a second connecting plate. The first plate surface of the fixed plate is arranged opposite to the end face of the wheel hub casting and is fixedly connected to it at one end. The other end of the fixed plate protrudes from the inner ring surface of the wheel hub casting and is located above the end face of the pitch bearing. The plates of the first connecting plate, the baffle, and the second connecting plate are all arranged perpendicularly to the first plate surface and are fastened together. The plate surface of the baffle is arranged along the direction perpendicular to the rotation tangent of the pitch bearing and is located on the movement path of the stop post. The plates of the first connecting plate and the second connecting plate are arranged opposite to each other and are located on both sides of the movement path of the stop post. The first connecting plate, the baffle, and the second connecting plate are connected end to end in sequence, and their inner plates form a limiting groove.
[0013] Preferably, the locking tongue also includes a mounting base plate, which is fixedly connected to the end face of the pitch bearing near the fixed plate, and the stop post is arranged perpendicularly to the surface of the mounting base plate and is fastened to it.
[0014] Preferably, it also includes a limiting component, which includes a limiting plate and a stop. The limiting plate is fixedly connected to the plate surface and is located inside the movement path of the stop post and is arranged opposite to the plate surface of the stop. The stop is long and narrow, with its first end located outside the movement path of the stop post and rotatably connected to the plate surface. The second end of the stop contacts and abuts against the plate surface of the limiting plate facing the stop.
[0015] Preferably, the limiting component further includes a fixing bolt, and a bolt through hole is provided on the plate surface corresponding to the first end of the stop. The screw of the fixing bolt passes through the bolt through hole and is locked to the fixing plate. The first end of the stop is located between the nut of the fixing bolt and the opposite surface of the plate surface, and is rotatably connected to the screw of the fixing bolt.
[0016] Preferably, the limiting component also includes a torsion spring, which is sleeved on the screw between the nut of the fixing bolt and the first plate surface, and the two ends of the torsion spring elastically abut against the opposite surfaces of the stop and the second connecting plate respectively.
[0017] Preferably, the limiting component also includes a lever, and an arc-shaped hole is provided on the first plate surface along the movement path of the second end of the stop. One end of the lever is fixedly connected to the second end of the stop, and the other end passes through the arc-shaped hole and protrudes from the second plate surface of the fixed plate.
[0018] Preferably, the locking tongue also includes two supporting triangular plates, both of which are fixedly connected to the mounting base plate. The two supporting triangular plates are located on both sides of the stop post along the rotation direction of the pitch bearing, respectively, to support the cylindrical surface of the stop post.
[0019] Preferably, it also includes a locking bolt, a screw bottom hole is provided on the end face of the wheel hub casting, and a screw through hole is provided on the plate surface corresponding to the screw bottom hole. The screw of the locking bolt passes through the screw through hole and is spirally connected to the screw bottom hole.
[0020] Preferably, it also includes a second locking bolt, a second screw hole on the end face of the pitch bearing, a third screw through hole on the surface of the mounting base plate corresponding to the second screw hole, and the screw of the second locking bolt passes through the third screw hole and is helically connected to the second screw hole.
[0021] As can be seen from the above technical solution, compared with the prior art, the present utility model discloses a solution with the following beneficial effects:
[0022] By using the limiting groove on the lock body and the stop pin on the lock tongue, the unexpected rotation of the pitch bearing can be effectively prevented, thereby improving blade safety. This purely mechanical locking method does not require an additional power source or complex control mechanism, has high reliability, and the lock body and hub casting are detachably connected, as are the lock tongue and pitch bearing, making it easy to install and maintain. It is also highly versatile and suitable for wind turbine units of different specifications. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0024] Figure 1 A schematic diagram of the structure of a blade safety lock (assembled with a hub casting and a pitch bearing) provided by this utility model;
[0025] Figure 2 A schematic diagram of the structure of a blade safety lock (concealing the pitch bearing and connecting plate 1) provided by this utility model;
[0026] Figure 3 for Figure 2A magnified view of a section at point A;
[0027] Figure 4 An exploded view of the lock body and limiting assembly provided by this utility model in the assembled state;
[0028] Figure 5 A schematic diagram of the locking tongue provided by this utility model.
[0029] in:
[0030] 1-Hub casting; 2-Pitch bearing; 3-Lock body; 4-Lock tongue; 5-Limiting assembly; 6-Locking bolt one; 7-Locking bolt two; 11-Screw bottom hole one; 21-Screw bottom hole two; 31-Fixing plate; 32-Connecting plate one; 33-Baffle; 34-Connecting plate two; 35-Rotating support plate; 41-Stop post; 42-Mounting base plate; 43-Support triangle plate; 51-Limiting plate; 52-Baffle; 53-Fixing bolt; 54-Torsion spring; 55-Lever; 56-Locking nut; 57-Support cylinder; 421-Screw through hole three; 501-Washer one; 502-Washer two; 503-Washer three; 504-Washer four; 311-Panel one; 3110-Screw through hole one; 3111-Arc-shaped hole; 3112-Screw through hole two; 3113-Support post. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0032] See appendix Figure 1 To be continued Figure 5 This utility model embodiment discloses a blade safety lock, in which an annular hub casting 1 and a pitch bearing 2 rotatably connected to the inner annular surface of the hub casting 1 are arranged in the nacelle of the wind turbine, including: a lock body 3 and a lock tongue 4.
[0033] The first end of the lock body 3 is detachably connected to the end face of the hub casting 1. The second end of the lock body 3 protrudes from the inner ring surface of the hub casting 1 and is located above the end face of the pitch bearing 2. It is provided with a limiting groove with the opening direction facing the rear of the rotation direction of the pitch bearing 2.
[0034] The locking tongue 4 is detachably connected to the end face of the pitch bearing 2. The locking tongue 4 is provided with a stop post 41 arranged opposite to the limiting groove. The stop post 41 enters the limiting groove as the pitch bearing 2 rotates, thereby locking the pitch bearing 2.
[0035] See appendix Figure 4 The lock body 3 includes a fixed plate 31, a first connecting plate 32, a baffle 33, and a second connecting plate 34. The first plate surface 311 of the fixed plate 31 is arranged opposite to the end face of the wheel hub casting 1 and is fixedly connected to it at one end. The other end of the fixed plate 31 protrudes from the inner ring surface of the wheel hub casting 1 and is located above the end face of the pitch bearing 2. The plates of the first connecting plate 32, the baffle 33, and the second connecting plate 34 are all arranged perpendicularly to the first plate surface 311 and are fastened together. The plate surface of the baffle 33 is arranged along the direction perpendicular to the rotation tangent of the pitch bearing 2 and is located on the movement path of the stop post 41. The plates of the first connecting plate 32 and the second connecting plate 34 are arranged opposite to each other and are located on both sides of the movement path of the stop post 41. The first connecting plate 32, the baffle 33, and the second connecting plate 34 are connected end to end in sequence, and their inner plates form a limiting groove. Therefore, the lock body 3 is composed of a fixed plate 31, a connecting plate 1 32, a baffle 33 and a connecting plate 2 34. The plates are vertically and tightly connected to form a stable frame structure, which improves the overall rigidity and strength of the lock body 3 and enables it to withstand greater locking forces.
[0036] See appendix Figure 5 The locking tongue 4 also includes a mounting base plate 42, which is fixedly connected to the end face of the pitch bearing 2 near the fixed plate 31. The stop post 41 is arranged perpendicularly to the plate surface of the mounting base plate 42 and is fastened.
[0037] See appendix Figure 4 It also includes a limiting component 5, which includes a limiting plate 51 and a stop 52. The limiting plate 51 is fixedly connected to the plate surface 311 and is located inside the movement path of the stop post 41 and opposite to the plate surface of the baffle 33. The stop 52 is elongated, with its first end located outside the movement path of the stop post 41 and rotatably connected to the plate surface 311. The second end of the stop 52 contacts and abuts against the plate surface of the limiting plate 51 facing the baffle 33. Thus, the limiting component 5 ensures that the stop post 41 will not flip out after entering the limiting groove.
[0038] In this embodiment, the limiting component 5 also includes a fixing bolt 53. A bolt through hole 3110 is provided on the plate surface 311 at the position corresponding to the first end of the stop 52. The screw of the fixing bolt 53 passes through the bolt through hole 3110 and is locked to the fixing plate 31. The first end of the stop 52 is located between the nut of the fixing bolt 53 and the opposite surface of the plate surface 311, and is rotatably connected to the screw of the fixing bolt 53.
[0039] Specifically, the lock body 3 also includes a rotating support plate 35. The plate surface of the rotating support plate 35 is arranged parallel to the plate surface 311 and is fixedly connected to the end of the connecting plate 34 away from the plate surface 311. The rotating support plate 35 has a support hole arranged corresponding to the bolt through hole 3110. The screw end of the fixing bolt 53 passes through the support hole and the bolt through hole 3110 in sequence and protrudes out onto the second plate surface of the fixing plate 31. The nut of the fixing bolt 53 contacts and abuts against the plate surface of the support plate 35 facing away from the plate surface 311.
[0040] In some embodiments, the limiting component 5 further includes a torsion spring 54, which is sleeved on the threaded rod between the nut of the fixing bolt 53 and the first plate surface 311. The two elastically abutting ends of the torsion spring 54 respectively contact and abut the opposing surfaces of the stop bracket 52 and the second connecting plate 34. Thus, after the stop post 41 enters the limiting groove, the stop bracket 52 can automatically reset to its initial position under the elastic force of the torsion spring 54, preventing the stop post 41 from reversing and dislodging from the limiting groove, thereby improving work efficiency.
[0041] Specifically, the baffle 52 includes two parallel elongated plates and a connecting block fastened between the opposite surfaces of the two elongated plates. The first end of the elongated plate along its length is provided with a rotating hole corresponding to the bolt through hole 3110. The rotating hole is rotatably connected to the screw of the fixing bolt 53. The second end of the elongated plate contacts and abuts against the surface of the limiting plate 51 facing the baffle 33. The torsion spring 54 is sleeved on the screw of the fixing bolt 53 located between the two elongated plates. The two ends of the torsion spring 54 elastically abut against the opposite surfaces of the connecting block and the connecting plate 34, respectively.
[0042] Specifically, the limiting component 5 also includes a locking nut 56 and a support cylinder 57. The locking nut 56 is screwed to the screw end of the fixing bolt 53 that is exposed on the second plate surface of the fixing plate 31. The support cylinder 57 is sleeved on the screw of the fixing bolt 53 and is located between the stop 52 and the plate surface 311. It is used to adjust the position of the stop 52 and to support the space between the stop 52 and the plate surface 311.
[0043] More specifically, it also includes gasket 501, gasket 502, gasket 503, and gasket 504. Gaskets 501, 502, 503, and 504 are all fitted onto the fixing bolt 53. Gasket 501 is located between the nut of the fixing bolt 53 and the rotating support plate 35. Gasket 502 is located between the rotating support plate 35 and the stop 52. Gasket 503 is located between the stop 52 and the support cylinder 57. Gasket 504 is located between the second plate surface of the fixing plate 31 and the locking nut 56.
[0044] In other embodiments, the limiting assembly 5 further includes a lever 55. An arc-shaped hole 3111 is formed on the first plate surface 311 along the movement path of the second end of the stop bracket 52. One end of the lever 55 is fixedly connected to the second end of the stop bracket 52, and the other end passes through the arc-shaped hole 3111 and protrudes from the second plate surface of the fixing plate 31. Thus, after maintenance or repair, the opening of the limiting groove can be manually opened using the lever 55, causing the stop post 41 to rotate in the opposite direction and disengage from the limiting groove.
[0045] See appendix Figure 5 The locking tongue 4 also includes two supporting triangular plates 43, both of which are fixedly connected to the mounting base plate 42. The two supporting triangular plates 43 are located on either side of the stop post 41 along the rotation direction of the pitch bearing 2, supporting the cylindrical surface of the stop post 41. Thus, the two supporting triangular plates 43, located on either side of the stop post 41 along the rotation direction of the pitch bearing 2, effectively disperse the locking force on the stop post 41, reduce deformation and wear of the stop post 41, and extend the service life of the stop post 41.
[0046] In this embodiment, a locking bolt 6 is also included. A screw bottom hole 11 is provided on the end face of the wheel hub casting 1. A screw through hole 3112 corresponding to the screw bottom hole 11 is provided on the plate surface 311. The screw of the locking bolt 6 passes through the screw through hole 3112 and is spirally connected to the screw bottom hole 11.
[0047] Specifically, it also includes support columns 3113. The three support columns 3113 are respectively arranged corresponding to three adjacent screw bottom holes 11, and are all fixedly connected to the fixing plate 31. The support columns 3113 have screw through holes 3112 along their axis.
[0048] Specifically, it also includes locking bolt 27, screw hole 21 is provided on the end face of pitch bearing 2, screw through hole 3 421 is provided on the plate surface of mounting base plate 42 corresponding to screw hole 21, and the screw of locking bolt 27 passes through screw through hole 3 421 and is spirally connected to screw hole 21.
[0049] The specific principle and usage method of the blade safety lock provided in this embodiment are as follows:
[0050] Installation steps:
[0051] Fixing the lock body: First, the fixing plate 31 of the lock body 3 is detachably connected to the end face of the wheel hub casting 1 using locking bolt 6.
[0052] Install the locking tongue: Connect the mounting base plate 42 of the locking tongue 4 to the end face of the pitch bearing 2 in a detachable manner using locking bolt 2 7 to complete the installation of the blade safety lock.
[0053] Locking steps:
[0054] Rotate the pitch bearing: When it is necessary to lock the blades (such as during wind turbine maintenance or in an emergency), rotate the pitch bearing 2 so that the stop pin 41 on the locking tongue 4 rotates with the pitch bearing 2 and enters the limiting groove of the lock body 3, thereby locking the pitch bearing 2 and preventing the blades from rotating.
[0055] Unlocking steps:
[0056] Manual unlocking: When maintenance is completed or when it is necessary to restore the normal rotation of the blades, manually open the slot of the limit groove by using lever 55, so that the stop 41 rotates in the opposite direction and disengages from the limit groove. Remove the lock body 3 and the lock tongue 4 to release the lock on the pitch bearing 2, and the blades can resume normal rotation.
[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A blade safety lock, arranged in a nacelle of a wind power generator, with a ring-shaped hub casting (1) and a variable pitch bearing (2) in rotational connection with an inner ring face of the hub casting (1), characterized in that include: Lock body (3), the first end of the lock body (3) is detachably connected to the end face of the hub casting (1), the second end of the lock body (3) protrudes out of the inner ring surface of the hub casting (1) and is located above the end face of the pitch bearing (2), and is provided with a limiting groove with the opening direction facing the rear of the rotation direction of the pitch bearing (2). Locking tongue (4) is detachably connected to the end face of the pitch bearing (2). The locking tongue (4) is provided with a stop post (41) arranged opposite to the limiting groove. The stop post (41) enters the limiting groove as the pitch bearing (2) rotates to lock the pitch bearing (2).
2. The blade safety lock according to claim 1, characterized in that, The lock body (3) includes a fixing plate (31), a connecting plate one (32), a baffle (33), and a connecting plate two (34). The first plate surface (311) of the fixing plate (31) is arranged opposite to the end face of the wheel hub casting (1) and is fixedly connected to it at one end. The other end of the fixing plate (31) protrudes from the inner ring surface of the wheel hub casting (1) and is located above the end face of the pitch bearing (2). The plates of the first connecting plate (32), the baffle (33), and the second connecting plate (34) are all aligned with the end face of the wheel hub casting (1). The first plate (311) is arranged vertically and fastened together. The plate surface of the baffle (33) is arranged along the direction perpendicular to the rotation tangent of the pitch bearing (2) and is located on the movement path of the stop column (41). The plates of the first connecting plate (32) and the second connecting plate (34) are arranged opposite each other and are located on both sides of the movement path of the stop column (41). The first connecting plate (32), the baffle (33) and the second connecting plate (34) are connected end to end in sequence, and their inner plates form the limiting groove.
3. The blade safety lock according to claim 2, characterized in that, The locking tongue (4) also includes a mounting base plate (42), which is fixedly connected to the end face of the pitch bearing (2) near the fixed plate (31), and the stop post (41) is arranged perpendicularly to the plate surface of the mounting base plate (42) and is fastened.
4. The blade safety lock according to claim 2, characterized in that, It also includes a limiting component (5), which includes a limiting plate (51) and a stop (52). The limiting plate (51) is fixedly connected to the first plate surface (311). The limiting plate (51) is located inside the movement path of the stop post (41) and is arranged opposite to the plate surface of the baffle (33). The stop (52) is long and narrow. The first end of the stop (52) along its length is located outside the movement path of the stop post (41) and is rotatably connected to the first plate surface (311). The second end of the stop (52) contacts and abuts against the plate surface of the limiting plate (51) facing the baffle (33).
5. A blade safety lock according to claim 4, characterized in that, The limiting component (5) also includes a fixing bolt (53). The plate surface (311) has a bolt through hole (3110) at the position corresponding to the first end of the stop (52). The screw of the fixing bolt (53) passes through the bolt through hole (3110) and locks with the fixing plate (31). The first end of the stop (52) is located between the nut of the fixing bolt (53) and the opposite surface of the plate surface (311), and is rotatably connected to the screw of the fixing bolt (53).
6. A blade safety lock according to claim 5, characterized in that, The limiting component (5) also includes a torsion spring (54), which is sleeved on the screw between the nut of the fixing bolt (53) and the first plate (311). The two ends of the torsion spring (54) that elastically abut against each other respectively contact the opposite surfaces of the stop (52) and the second connecting plate (34).
7. A blade safety lock according to claim 4, characterized in that, The limiting component (5) also includes a lever (55). The first plate surface (311) has an arc-shaped hole (3111) along the movement path of the second end of the stop (52). One end of the lever (55) is fixedly connected to the second end of the stop (52), and the other end passes through the arc-shaped hole (3111) and protrudes to the second plate surface of the fixed plate (31).
8. A blade safety lock according to claim 3, characterized in that, The locking tongue (4) also includes a supporting triangular plate (43), and there are two supporting triangular plates (43) which are fixedly connected to the mounting base plate (42). The two supporting triangular plates (43) are located on both sides of the stop post (41) along the rotation direction of the pitch bearing (2) to support the cylindrical surface of the stop post (41).
9. A blade safety lock according to claim 2, characterized in that, It also includes a locking bolt (6), a screw bottom hole (11) is provided on the end face of the wheel hub casting (1), and a screw through hole (3112) is provided on the plate surface (311) corresponding to the screw bottom hole (11). The screw of the locking bolt (6) passes through the screw through hole (3112) and is spirally connected to the screw bottom hole (11).
10. A blade safety lock according to claim 3, characterized in that, It also includes a second locking bolt (7), a second screw hole (21) is provided on the end face of the pitch bearing (2), and a third screw through hole (421) is provided on the plate surface of the mounting base plate (42) corresponding to the second screw hole (21). The screw of the second locking bolt (7) passes through the third screw through hole (421) and is spirally connected to the second screw hole (21).