CN215171381U - Locking device and wind generating set - Google Patents

Abstract

The application provides a locking device and a wind generating set. The locking device includes: a housing having a cylindrical shape, a first end having a pin-extending hole, and a second end having an end plate; the pin rod is movably arranged in the shell; the driving assembly is used for driving the pin rod to extend out or retract through the pin extending hole and comprises a limiting rod, an elastic piece and a driving device, the elastic piece is arranged in parallel with the limiting rod, the driving device is used for driving the limiting rod to move between a first position and a second position, two ends of the elastic piece are respectively abutted against the end plate and the pin rod and used for applying outwards extending thrust to the pin rod, and the limiting rod is used for limiting the pin rod to extend out or retract between the first position and the second position; when the limiting rod is located at the first position and the pin rod is subjected to the action of external force and retracts into the shell, the pin rod extrudes the elastic piece, and the limiting rod is kept immovable relative to the shell. The driving times can be reduced, the energy is saved, and the service life of the locking device is prolonged.

Description

Locking device and wind generating set

Technical Field

The application relates to the technical field of wind power generation, in particular to a locking device and a wind generating set.

Background

Currently, wind generating sets are all equipped with blade locking devices. As shown in fig. 1, a locking device 100 'of the related art includes a housing 110', a pin 120 'provided in the housing 110', a lead screw 130 'coupled with the pin 120', and a motor 140 'driving the lead screw 130' to rotate. Specifically, the protruding end of the pin rod 120 'is used for combining with a locking hole on the blade, the other end opposite to the protruding end is provided with a threaded hole combined with the lead screw 130', one end of the lead screw 130 'is combined with the threaded hole of the pin rod 120', the other end is connected with the motor 140 'to receive a rotational driving force from the motor 140', and the motor 140 'drives the lead screw 130' to rotate so as to drive the pin rod 120 'to extend or retract into the housing 110', so that the blade is locked and released. When the blade is overhauled or the angle of the blade is adjusted, the driving motor is required to drive the pin rod to stretch and retract repeatedly. Because the pin rod is rigidly connected with the screw rod, when the pin rod needs to extend out and retract, the pin rod can only be driven to move through the motor drive, energy waste is caused to a certain extent, the number of motor drive times is increased, and the service life is also influenced.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the present application is to provide a locking device.

A second aspect of the present application is to provide a wind turbine generator set.

To achieve the above object, an embodiment of the first aspect of the present application provides a locking device for a wind turbine generator system, the locking device including: a housing having a cylindrical shape, a first end having a pin-extending hole, and a second end having an end plate; a pin movably disposed in the housing; the driving assembly is used for driving the pin rod to extend out or retract through the pin extending hole and comprises a limiting rod, an elastic piece and a driving device, the elastic piece is arranged in parallel with the limiting rod, the driving device is used for driving the limiting rod to move between a first position and a second position, two ends of the elastic piece are respectively abutted against the end plate and the pin rod and used for applying outward extending thrust to the pin rod, and the limiting rod is used for limiting the extension and retraction of the pin rod between the first position and the second position; when the limiting rod is located at the first position and the pin rod retracts into the shell under the action of external force, the pin rod presses the elastic piece, and the limiting rod is kept immovable relative to the shell.

Optionally, the outer side wall of the first end of the limiting rod is provided with a first protruding portion, the pin rod is provided with a second protruding portion, and the first protruding portion abuts against the outer side of the second protruding portion in the moving direction of the pin rod. When the limiting rod moves from the first position to the second position, the first bulge presses the second bulge, so that the pin rod is pushed to retract into the shell, and the elastic piece is pressed to contract.

Optionally, the pin rod has an axially extending slot extending outwardly a predetermined length from the second projection; the first end of the limiting rod is located in the slot and can move in the slot.

Optionally, the pin rod comprises a pin head and a bracket connected to the inner end of the pin head, and the pin head and the bracket are detachably connected; the support comprises a sleeve and a second protruding portion formed at the first end of the sleeve, the sleeve is sleeved on the outer side of the limiting rod, and the elastic piece is arranged on the radial inner side of the sleeve and is abutted to the second protruding portion.

Optionally, the locking device further includes a guide support portion located inside the housing, the guide support portion being connected to the end plate and extending along a length direction of the pin rod for guiding movement of the stopper rod.

Optionally, the guide supporting part is in a sleeve shape, and the guide supporting part is sleeved on the outer side of the limiting rod; one of the inner side wall of the guide supporting part and the outer side wall of the limiting rod is provided with a guide groove, and the other one of the inner side wall of the guide supporting part and the outer side wall of the limiting rod is provided with a guide protruding part matched with the guide groove; a part of the elastic piece is sleeved on the outer side of the guide supporting part, and the elastic piece is a compression spring.

Optionally, the limiting rod is an internal thread sleeve, the driving device includes a motor and a lead screw connected with an output shaft of the motor, and the lead screw extends into the guide supporting part and is matched with the internal thread of the limiting rod; or the driving device comprises an electromagnetic push rod connected with the limiting rod or a hydraulic rod connected with the limiting rod.

Optionally, the locking device further comprises: the first detection switch and the second detection switch are arranged at a first position and a second position of the shell at intervals in the moving direction of the pin rod and are electrically connected with the driving device; and the trigger piece is arranged on the pin rod and moves between the first detection switch and the second detection switch along with the movement of the pin rod so as to trigger the first detection switch and the second detection switch.

Optionally, the trigger is a protrusion formed at one end of the pin, and the first detection switch and the second detection switch are both proximity switches.

An embodiment of a second aspect of the present application provides a wind turbine generator system, including: a hub; the locking device according to any one of the preceding claims, wherein the locking device is provided to the hub; the locking seat is arranged on a moving coil of the variable pitch bearing and provided with a locking hole used for matching the pin rod.

Optionally, a side of the locking seat facing the locking device is provided with a guide slope, and the locking hole is provided at a side of the guide slope.

The application provides a locking device, including casing, pin pole and drive assembly, make drive assembly include the elastic component of butt between the end plate of casing and pin pole, be favorable to exerting the thrust that outwards stretches out to the pin pole through the elastic component, be favorable to improving the locking stability of pin pole. And when the pin rod moves towards the shell under the action of external force, the elastic piece can be compressed to be shortened, so that the pin rod can be favorably retracted into the shell, and when the external force disappears, the elastic piece can automatically pop up the pin rod, the pin rod can extend out and retract without being driven by a driving device, so that the driving frequency can be reduced, the energy is saved, and the service life of the locking device is prolonged. And, make drive assembly still include the gag lever post, make the gag lever post exert the thrust of inside withdrawal to the pin rod, make the pin rod when retracting under the exogenic action, the gag lever post can not push the pin rod outward and interfere the withdrawal of pin rod, be favorable to guaranteeing to stretch out again after the pin rod can withdraw and withdraw under the non-driven circumstances, especially under the non-driven circumstances of drive arrangement, the gag lever post is motionless and the pin rod moves inwards for the gag lever post can remove contact state with the pin rod, drive arrangement can not follow-up. Moreover, make drive assembly still include drive arrangement, move in through drive arrangement drive gag lever post, make the gag lever post can promote the round pin pole extrusion elastic component and to the casing internal movement, realized controlling the shift position of round pin pole through the drive arrangement drive, be favorable to guaranteeing locking device's intelligent control nature.

The wind generating set that this application provided, because it has the locking device of any one in above-mentioned technical scheme, and then has the beneficial effect of any one in above-mentioned technical scheme, does not give unnecessary details here.

Drawings

The above and other objects and features of the present application will become more apparent from the following description of embodiments thereof taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows a cross-sectional schematic view of a locking device of the related art;

FIG. 2 illustrates a schematic structural view of a locking device of one embodiment of the present application with a pin in a first position;

FIG. 3 shows a schematic cross-sectional view in the direction A-A of FIG. 2;

FIG. 4 is a schematic structural view of a locking device of one embodiment of the present application with the pin in a second position under an external force;

FIG. 5 shows a schematic cross-sectional view in the direction B-B in FIG. 4;

FIG. 6 illustrates another cross-sectional schematic view of the locking device of one embodiment of the present application with the pin in the second position;

FIG. 7 illustrates a schematic structural view of a mount of an embodiment of the present application;

fig. 8 shows a partial structural schematic of a wind park according to an embodiment of the present application.

The reference numbers illustrate:

100 ' locking device, 110 ' housing, 120 ' pin, 130 ' lead screw, 140 ' motor,

100 locking device, 110 shell, 111 end plate, 112 mounting flange, 120 pin rod, 121 pin head, 122 slot, 123 bracket, 124 second bulge, 130 spacing rod, 131 first bulge, 132 guide bulge, 140 elastic element, 150 guide supporting part, 151 guide groove, 160 lead screw, 170 motor, 181 first detection switch, 182 second detection switch, 183 trigger piece, 210 hub, 220 locking seat, 221 locking hole and 222 guide inclined plane.

Detailed Description

The locking device 100 and the wind turbine generator set of some embodiments of the present application will be described below with reference to fig. 2 to 8.

This application may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Note that, in the present application, the expressions of directions such as outward, and the like are all directions toward the pin protruding hole with respect to the end plate 111, that is, directions in which the pin is exposed from the pin protruding hole, and conversely, inward directions. The external force in the present application refers to a force applied to the pin 120 by a component other than the locking device 100.

Fig. 2 shows a schematic view of the locking device 100 according to an embodiment of the present application in a state where the pin 120 is extended, i.e., in a first position, and fig. 3 shows a schematic cross-sectional view in the direction a-a of fig. 2. As shown in fig. 2 and 3, a first embodiment of the present application provides a locking device 100. The locking device 100 includes a housing 110, a pin 120, and a drive assembly. The housing 110 has a cylindrical shape, a first end of the housing 110 has a pin protruding hole, and a second end of the housing 110 has an end plate 111. The pin 120 is movably disposed in the housing 110. The driving assembly serves to drive the pin rod 120 to be extended or retracted through the pin extension hole.

The driving assembly comprises an elastic member 140, and two ends of the elastic member 140 abut against the end plate 111 and the pin rod 120 respectively, and are used for applying an outward extending thrust to the pin rod 120, so that the pin rod 120 is kept in an extending state in a normal state, and the locking stability of the pin rod 120 is improved. In the process that the pin rod 120 retracts into the shell 110 under the action of external force, the elastic element 140 can be squeezed by the pin rod 120 to be shortened, so that the pin rod 120 can be retracted into the shell 110 smoothly, when the external force disappears, the elastic element 140 can also automatically eject the pin rod 120, the extension and retraction of the pin rod 120 can be driven without a driving device, and the driving frequency of the driving device can be reduced.

The driving assembly further comprises a driving device and a limiting rod 130, wherein the limiting rod 130 is connected with the driving device, and the driving device controls the limiting rod 130 to move between a first position and a second position, so as to control the position of the pin rod 120.

Specifically, when the stopper 130 is moved outward to the first position, the maximum extension length of the elastic member 140 is defined, thereby limiting the maximum protruding position of the pin 120 pushed outward by the elastic member 140. When the stop bar 130 is moved inwardly to the second position, a minimum extended length of the elastic member 140 is defined, thereby defining a retracted position of the pin 120.

As shown in fig. 2 and 3, in order to keep the pin 120 in the extended state, the driving device may move the limiting rod 130 outwards, and since the elastic member 140 may apply a pushing force to the pin 120 to move outwards, during the outward movement of the limiting rod 130, the elastic member 140 may gradually extend until the limiting rod 130 reaches the first position, and the pin 120 extends out of the housing 110 under the elastic force of the elastic member 140. At this time, in the case where the driving means stops driving and thus the stopper rod 130 is not moved, if the pin rod 120 is pushed by an external force, the pin rod 120 may be pushed into the housing 110 by the external force, and in the process of retracting the pin rod 120 into the housing 110, the elastic member 140 is pressed, the stopper rod 130 is kept stationary with respect to the housing 110, the driving means does not need to be rotated, and the retracting action of the pin rod 120 is not hindered. Referring to fig. 4 and 5, the locking device 100 is shown when the pin 120 is retracted into the housing 110 by an external force. Of course, the pin rod 120 may be extended out of the housing 110 by the elastic force of the elastic member 140 after the external force is removed. The extension and retraction of the pin rod 120 can be driven without depending on a driving device, thereby reducing the driving times, saving energy and prolonging the service life of the locking device 100.

Of course, the driving device may also drive the limiting rod 130 to move to the second position, push the pin 120 to retract into the housing 110 through the limiting rod 130, and press the elastic member 140 through the pin 120. See fig. 6 for a schematic view of the pin 120 of the locking device 100 when it is retracted into the housing 110 by the drive means. The position of the limiting rod 130 is controlled through the driving device, and then the moving range of the pin rod 120 is controlled.

In some embodiments, as shown in fig. 3, 5 and 6, the outer side wall of the first end of the limiting rod 130 is provided with a first protrusion 131, the pin rod 120 is provided with a second protrusion 124, and the first protrusion 131 abuts against the outer side of the second protrusion 124 in the moving direction of the pin rod 120. On one hand, in the process that the pin rod 120 retracts into the housing 110 under the action of external force, the first protruding portion 131 does not block the second protruding portion 124, but is separated from the second protruding portion 124, so that the pin rod 120 can be ensured to retract smoothly under the action of external force, the limiting rod 130 does not interfere with the retracting operation of the pin rod 120, and the pin rod 120 is prevented from being damaged due to the action of external force. On the other hand, in the process of inward movement of the limiting rod 130, the first protrusion 131 pushes the second protrusion 124 to move inward, and then the pin 120 is pushed to move inward as a whole, so that the driving device actively adjusts the position of the pin 120 by controlling the position of the limiting rod 130.

In a specific application, the first protrusion 131 may be an outer flange located at the first end of the limiting rod 130, and is circumferentially and continuously distributed around the limiting rod 130, so as to facilitate processing. Of course, the first protrusions 131 may also be spaced around the limiting rod 130, so as to save material, and correspond to the positions of the second protrusions 124.

In some embodiments, the pin 120 is provided with an axially extending slot 122, the slot 122 extending outwardly from the second projection 124 by a predetermined length; the first end of the limiting rod 130 is located in the slot 122 and can move in the slot 122. In the process of retracting the pin 120 to the housing 110 under the action of external force, the first end of the limiting rod 130 can gradually extend into the slot 122 along with the inward movement of the pin 120, so that the situation that the pin 120 is obstructed by the limiting rod 130 can be effectively avoided, the limiting rod 130 can be kept still in the process, and the follow-up of the driving device is avoided.

In a specific application, the first protrusion 131 may be located inside the slot 122, and the second protrusion 124 covers a portion of the notch of the slot 122, so that the first protrusion 131 is located outside the second protrusion 124, which is beneficial for the driving device to drive the first protrusion 131 on the limiting rod 130 to move inwards, and further, the pin rod 120 is pushed to move inwards integrally into the housing 110.

In some embodiments, the pin 120 may include a pin head 121 and a bracket 123 attached to an inboard end of the pin head 121.

Further, the insertion groove 122 is provided on the side of the pin head 121 facing the inside.

Further, the bracket 123 is provided with the second protrusion 124, and the bracket 123 is detachably connected to the pin head 121, so that the first protrusion 131 at the first end of the limiting rod 130 is disposed outside the second protrusion 124 in advance, for example, extends into the slot 122, and then the pin head 121 and the bracket 123 are assembled together, so that the first protrusion 131 is limited in the slot 122.

Further, the bracket 123 includes a sleeve and a second protrusion 124 formed at a first end of the sleeve, so that the sleeve is fitted over the outer side of the stopper rod 130. The pin 120 can be effectively prevented from interfering with the limit rod 130 in the process of moving relative to the limit rod 130.

Further, the elastic member 140 is disposed radially inside the sleeve and abuts against the second projecting portion 124. Even if the first protrusion 131 is disposed outside the second protrusion 124, the elastic member 140 is disposed inside the second protrusion 124. On one hand, the elastic part 140 can apply the pushing force of the outward movement to the pin rod 120 in time in the process of the outward movement of the limiting rod 130, and on the other hand, the pin rod 120 can be enabled to extrude the elastic part 140 in the retracting process, and the pin rod can retract stably.

In a specific application, the second protruding portion 124 may be configured by an outer flange at the first end of the sleeve, and the second protruding portion 124 and the sleeve are integrally formed, so that the processing is convenient. The second projections 124 may be circumferentially distributed continuously or at intervals around the sleeve. Further, in the case where both the first projecting portion 131 and the second projecting portion 124 are annular, the outer diameter of the first projecting portion 131 is made larger than the inner diameter of the second projecting portion 124, thereby ensuring that the first projecting portion 131 does not fall out of the insertion groove 122.

In some embodiments, the locking device 100 further includes a guide support 150 located inside the housing 110, the guide support 150 being connected to the end plate 111 and extending along the length of the pin 120 for guiding the movement of the stopper 130. The stopper rod 130 can move smoothly.

Further, the guide support portion 150 is formed in a sleeve shape, and the guide support portion 150 is sleeved on the outer side of the limiting rod 130. That is, the limiting rod 130 moves inside the sleeve, which is beneficial to ensuring the stable movement of the limiting rod 130.

Further, one of the inner sidewall of the guide support 150 and the outer sidewall of the stopper rod 130 is provided with a guide groove 151, and the other is provided with a guide protrusion 132 engaged with the guide groove 151. On the one hand, the moving stability of the limiting rod 130 can be improved, and on the other hand, the limiting rod 130 is limited to move along a set straight line.

In a specific application, the guide projection 132 may be a flat key disposed on the guide support 150 by a bolt.

In a specific application, a part of the elastic member 140 is sleeved on the outer side of the guide support portion 150. The guide support portion 150 may also limit the elastic member 140, which is beneficial to the elastic member 140 to extend or compress along the extending direction of the guide support portion 150.

In a specific application, the elastic member 140 is a compression spring.

In some embodiments, the stop rod 130 is an internally threaded sleeve, and the driving device includes a motor 170 and a lead screw 160 connected to an output shaft of the motor 170, wherein the lead screw 160 extends into the guide support 150 and is engaged with the internal thread of the stop rod 130. The limiting rod 130 is driven to move by the motor 170 and the lead screw 160.

In a specific application, the motor 170 is a bidirectional motor 170, which can rotate forward and backward to realize outward movement and inward movement of the limiting rod 130.

Of course, in other embodiments, the driving device may also include an electromagnetic push rod connected to the limiting rod 130 or a hydraulic rod connected to the limiting rod 130. The stopper 130 is driven to move by an electromagnetic push rod or a hydraulic rod.

In some embodiments, the locking device 100 further includes a first detection switch 181 and a second detection switch 182, and the first detection switch 181 and the second detection switch 182 are spaced apart from each other in the first position and the second position of the housing 110 in the moving direction of the pin 120. The locking device 100 further includes a trigger 183, the trigger 183 is disposed on the pin 120, and the trigger 183 moves between the first detection switch 181 and the second detection switch 182 with the movement of the pin 120 to trigger the first detection switch 181 and the second detection switch 182. The detection of the moving position of the pin rod 120 is facilitated through the matching of the detection switch and the trigger 183, and the user can accurately judge the moving position of the pin rod 120 by means of the two detection switches.

In a particular application, the first detection switch 181 can be triggered by the trigger 183 when the pin 120 is in the extended state. While in the retracted state of the pin 120, the second detection switch 182 can be triggered by the trigger 183.

Further, both the first detection switch 181 and the second detection switch 182 are connected to the controller, so that the controller can control the start or stop of the driving device according to the detection result of the detection switches.

In a specific application, when the motor 170 rotates to drive the limiting rod 130 to extend, the elastic member 140 pushes the pin 120 to extend outward. After the pin 120 reaches the head, the first detection switch 181 is triggered, and the motor 170 stops rotating. The pin 120 is now in an extended state, and the pin 120 is held in the extended position entirely against the resilient member 140. If the pin 120 is moved inward by an external force, the elastic member 140 is compressed, but since the pin 120 is separated from the limit rod 130, the movement of the pin 120 does not cause the follow-up of the limit rod 130 and the motor 170, thereby preventing the rigid damage of the pin 120, the limit rod 130 and the lead screw 160. When the external force is removed, the pin 120 is restored to the extended state again by the elastic member 140. Therefore, it is not necessary to repeatedly operate the driving device to control the telescopic state of the pin 120.

When active control is required to retract the pin 120, the motor 170 may be driven to rotate in reverse. When the motor 170 rotates in the reverse direction, the limiting rod 130 is driven to retract, and the pin 120 is pushed to retract until the motor 170 stops operating after the second detection switch 182 is triggered, and the pin 120 is in a retracted state.

Further, the trigger 183 is a protrusion formed at one end of the pin 120, and both the first detection switch 181 and the second detection switch 182 are proximity switches.

In a particular application, a first protective sheath is disposed at a first location of housing 110, first detection switch 181 is disposed within the first protective sheath, and a second protective sheath is disposed at a second location of housing 110, and second detection switch 182 is disposed within the second protective sheath.

In a specific application, a mounting flange 112 is provided on the housing 110 to facilitate the mounting and positioning of the locking device 100. The mounting flange 112 may be integrally formed with the housing 110 and may surround the housing 110 about its circumference.

Fig. 7 shows a schematic structural view of a mount of an embodiment of the present application. Fig. 8 shows a partial structural schematic of a wind park according to an embodiment of the present application. As shown in fig. 7 and 8, a second aspect embodiment of the present application provides a wind turbine generator system, which includes a hub 210, a locking seat 220 and a locking device 100 as in any one of the above embodiments, wherein the locking device 100 is disposed on the hub 210, the locking seat 220 is disposed on a moving coil of a pitch bearing, and the locking seat 220 is provided with a locking hole 221 for cooperating with a pin rod 120.

In this embodiment, the locking device 100 is used for automatic locking or automatic limiting of the blades of the wind turbine generator set. The blade of the wind generating set is connected with the moving ring of the variable pitch bearing, the locking seat 220 is arranged on the moving ring of the variable pitch bearing, and therefore the locking seat 220 is locked by inserting the pin rod 210 of the locking device 100 into the locking hole 221 in the locking seat 220, and the blade can be locked. The blades are prevented from continuously rotating relative to the hub 210, and operations such as stall maintenance and replacement of the blades are facilitated.

In a specific application, during the rotation of the blade relative to the hub 210, the locking seat 220 can move along with the moving coil of the pitch bearing and press the pin rod 120 of the locking device 100, so that the pin rod 120 retracts, the elastic member 140 compresses, when the locking hole 221 of the locking seat 220 moves to the position of the pin rod 120, the external force acting on the pin rod 120 disappears, and the pin rod 120 can extend out of the locking hole 221 under the elastic force of the elastic member 140, so that the locking seat 220 and the blade are automatically locked.

In a particular application, the locking device 100 is enabled to effectively lock a blade of a wind turbine generator set in time when the blade is feathered to a 90 degree pitch angle position.

Further, as shown in fig. 7, a guide slope 222 is provided to a side of the lock holder 220 facing the lock device 100, and the lock hole 221 is provided to a side of the guide slope 222. It is advantageous that the pin rod 120 smoothly retracts along the guide slope 222 and then protrudes into the locking hole 221 during being pressed by the locking socket 220.

During the movement of the head of the pin rod 120 along the guide slope 222 of the lock seat, the pin rod 120 is continuously retracted, and when the head of the pin rod 120 moves to a position corresponding to the lock hole 221 after passing over the guide slope 222, the pin rod 120 is extended by the elastic member to be engaged with the lock hole 221. In this process, the driving device is not required to operate, thereby reducing the number of operations of the driving device.

Of course, since the wind turbine generator system provided by the embodiment has the locking device 100 according to any one of the embodiments, the wind turbine generator system further has the beneficial effects according to any one of the embodiments, which are not described in detail herein.

While the foregoing is directed to embodiments of the present application, and certain embodiments shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments (e.g., where different features described in different embodiments may be combined), and that such changes and modifications may be made without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.

Claims (11)

1. A locking device (100) for a wind park, characterized in that the locking device (100) comprises:

a cylindrical housing (110) having a pin-extending hole at a first end and an end plate (111) at a second end;

a pin (120) movably disposed in the housing (110);

a driving assembly for driving the pin rod (120) to be extended or retracted through the pin extension hole,

the driving assembly comprises a limiting rod (130), an elastic piece (140) arranged in parallel with the limiting rod (130) and a driving device for driving the limiting rod (130) to move between a first position and a second position, two ends of the elastic piece (140) are respectively abutted against the end plate (111) and the pin rod (120) and used for applying outwards extending thrust to the pin rod (120), and the limiting rod (130) is used for limiting the extension and retraction of the pin rod (120) between the first position and the second position;

when the limiting rod (130) is located at the first position, the pin rod (120) is subjected to external force to retract the shell (110), the pin rod (120) presses the elastic piece (140), and the limiting rod (130) is kept immovable relative to the shell (110).

2. The locking device (100) of claim 1,

the outer side wall of the first end of the limiting rod (130) is provided with a first protruding portion (131), the pin rod (120) is provided with a second protruding portion (124), in the moving direction of the pin rod (120), the first protruding portion (131) abuts against the outer side of the second protruding portion (124), when the limiting rod (130) moves from the first position to the second position, the first protruding portion (131) extrudes the second protruding portion (124), so that the pin rod (120) is pushed to retract into the shell (110), and the elastic piece (140) is extruded to contract.

3. The locking device (100) of claim 2,

the pin shaft (120) having an axially extending slot (122), the slot (122) extending outwardly from the second projection (124) a predetermined length;

the first end of the limiting rod (130) is located in the slot (122) and can move in the slot (122).

4. The locking device (100) of claim 2,

the pin rod (120) comprises a pin head (121) and a bracket (123) connected to the inner end of the pin head (121), and the pin head (121) and the bracket (123) are detachably connected;

the support (123) comprises a sleeve and a second protruding portion (124) formed at the first end of the sleeve, the sleeve is sleeved on the outer side of the limiting rod (130), and the elastic piece (140) is arranged on the radial inner side of the sleeve and is abutted to the second protruding portion (124).

5. The locking device (100) according to any one of claims 1 to 4, wherein the locking device (100) further comprises a guide support (150) located inside the housing (110), the guide support (150) being connected to the end plate (111) and extending along a length direction of the pin rod (120) for guiding the movement of the stopper rod (130).

6. The locking device (100) of claim 5,

the guide supporting part (150) is in a sleeve shape, and the guide supporting part (150) is sleeved on the outer side of the limiting rod (130);

one of the inner side wall of the guide support part (150) and the outer side wall of the limiting rod (130) is provided with a guide groove (151), and the other one is provided with a guide bulge part (132) matched with the guide groove (151);

a part of the elastic piece (140) is sleeved on the outer side of the guide supporting part (150), and the elastic piece (140) is a compression spring.

7. The locking device (100) of claim 6,

the limiting rod (130) is an internal thread sleeve, the driving device comprises a motor (170) and a lead screw (160) connected with an output shaft of the motor (170), and the lead screw (160) extends into the guide supporting part (150) and is matched with the internal thread of the limiting rod (130); or

The driving device comprises an electromagnetic push rod connected with the limiting rod (130) or a hydraulic rod connected with the limiting rod (130).

8. The locking device (100) according to any one of claims 1 to 4, wherein the locking device (100) further comprises:

a first detection switch (181) and a second detection switch (182), wherein the first detection switch (181) and the second detection switch (182) are arranged at a first position and a second position of the shell (110) at intervals in the moving direction of the pin rod (120), and are both electrically connected with the driving device;

and a trigger (183) provided to the pin (120), wherein the trigger (183) moves between the first detection switch (181) and the second detection switch (182) in accordance with the movement of the pin (120) to trigger the first detection switch (181) and the second detection switch (182).

9. The locking device (100) of claim 8,

the trigger (183) is a protrusion formed at one end of the pin lever (120), and the first detection switch (181) and the second detection switch (182) are both proximity switches.

10. A wind turbine generator set, comprising:

a hub (210);

the locking device (100) of any one of claims 1 to 9, the locking device (100) being provided to the hub (210);

the locking seat (220) is arranged on a moving coil of the variable pitch bearing, and the locking seat (220) is provided with a locking hole (221) used for matching the pin rod (120).

11. Wind park according to claim 10,

one side of the locking seat (220) facing the locking device (100) is provided with a guide inclined surface (222), and the locking hole (221) is arranged on one side of the guide inclined surface (222).

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