Wind turbine drive train braking and locking system and its usage method

Abstract

The present invention discloses a braking and locking system for a wind turbine drive train and a method of using the same. The system includes: a coupling brake disc, a high-speed shaft brake, a support, a support arm, a drive cylinder, and a locking member; the outer ring of the coupling brake disc is serrated, the high-speed shaft brake is arranged at the outer edge of the coupling brake disc, one end of the support is connected to the high-speed shaft brake, and the middle of the support arm is rotatably connected to the other end of the support; the cylinder body of the drive cylinder is arranged at the bottom of the high-speed shaft brake, the piston rod extends downward and is connected to one end of the support arm, the other end of the support arm is serrated and faces the coupling brake disc, and is used to rotate to engage with the coupling brake disc under the drive of the drive cylinder or rotate away from the coupling brake disc to release the engagement under the drive of the drive cylinder; the locking member is used to detachably lock the position of the support arm after the support arm and the coupling brake disc are engaged. There is no need to perform a complicated hole alignment process, and the locking member is convenient for installation and disassembly.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a braking and locking system for a drive chain of a wind turbine and a method for using the same. Background Art

[0002] Wind energy is one of the most representative renewable energies, which is of great significance for environmental protection, maintaining ecological balance, reducing dependence on conventional energy, and improving the energy structure. In a wind turbine generator set, in order to facilitate maintenance inside the hub, the wind turbine generator set is usually equipped with an impeller locking device, which consists of a locking disc installed on the main shaft and a locking pin installed on the frame or bearing seat. When it is necessary to lock the impeller, first, the blades are pitched, the impeller decelerates, and when the rotational speed of the high-speed shaft is lower than a preset value, the high-speed shaft brake is activated to brake, so that the drive chain stops rotating completely. Subsequently, in order to align the impeller locking pin with the hole on the locking disc, it is necessary to repeatedly perform the turning operation of the disc or manually pitch a certain blade and rely on the wind force to align the hole, which is time-consuming and laborious, and the efficiency is very low. Therefore, there is a situation where the impeller lock is not locked according to the regulations, and only the high-speed shaft is braked and then the operation enters the hub, which poses a potential safety hazard to personal safety. After the maintenance work is completed, it is necessary to withdraw the locking pin and release the impeller. Due to the low frequency of use of the locking pin, there are often situations where the pin is poorly lubricated or rusted and it is difficult to withdraw smoothly. Summary of the Invention

[0003] To solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a braking and locking system for a drive chain of a wind turbine and a method for using the same. The technical solutions are as follows:

[0004] In a first aspect, a braking and locking system for a drive chain of a wind turbine is provided, including: a coupling brake disc, a high-speed shaft brake, a support, a support arm, a driving oil cylinder, and a locking member; the outer ring of the coupling brake disc is tooth-shaped, the high-speed shaft brake is arranged at the outer edge of the coupling brake disc, one end of the support is connected to the high-speed shaft brake, and the middle part of the support arm is rotatably connected to the other end of the support; the cylinder body of the driving oil cylinder is arranged at the bottom of the high-speed shaft brake, the piston rod extends downward and is connected to one end of the support arm, and the other end of the support arm is tooth-shaped and faces the coupling brake disc, and is used to rotate to engage with the coupling brake disc under the drive of the driving oil cylinder or rotate away from the coupling brake disc to disengage under the drive of the driving oil cylinder; the locking member is used to detachably lock the position of the support arm after the support arm and the coupling brake disc are engaged.

[0005] In some optional implementation manners, the number of the support arms is 2, correspondingly, the number of the supports is 2, and they are symmetrically arranged on both sides of the high-speed shaft brake. The two support arms are in a V-shaped structure to hold the coupling brake disc.

[0006] In some alternative implementations, the locking member includes a positioning pin, through holes corresponding to each other are respectively provided on the support arm and the support base. After the support arm engages with the coupling brake disc, the through holes on the support arm and the support base are aligned, and the positioning pin is inserted into the corresponding through hole for locking.

[0007] In some alternative implementations, a split pin is detachably provided at the end of the positioning pin.

[0008] In some alternative implementations, the end of the support base is connected to the support arm by a first pin shaft.

[0009] In some alternative implementations, a self-lubricating bushing is sleeved on the first pin shaft.

[0010] In some alternative implementations, a spherical hinge earring is connected to the end of the piston rod of the driving oil cylinder. Corresponding through holes are provided on the end of the support arm and the spherical hinge earring. A second pin shaft is inserted and fixed in the corresponding through holes. The through hole on the support arm is an oblong hole.

[0011] In some alternative implementations, a split pin is provided at the end of the first pin shaft; and / or, a split pin is provided at the end of the second pin shaft.

[0012] In some alternative implementations, a control module is further included. The control module is used to automatically control the action of the driving oil cylinder after detecting that the coupling brake disc stops rotating.

[0013] In a second aspect, a method for using the wind turbine drive train braking and locking system according to any one of the above is provided, including:

[0014] After the coupling brake disc stops rotating, the piston rod of the driving oil cylinder moves downward, driving the support arm to rotate in the direction close to the coupling brake disc with the end of the support base as the fulcrum;

[0015] After the support arm rotates to engage with the coupling brake disc, the locking member is installed to complete the locking, and the maintenance operation is started;

[0016] After the maintenance operation is completed, the locking member is disassembled;

[0017] The piston rod of the driving oil cylinder moves upward, driving the support arm to rotate in the direction away from the coupling brake disc with the end of the support base as the fulcrum, and the support arm disengages from the coupling brake disc.

[0018] The main advantages of the technical solution of the present invention are as follows:

[0019] The braking and locking system for the drive train of a wind turbine and its usage method according to the present invention. After the coupling brake disc stops rotating, the support arm is engaged with the gear ring of the coupling brake disc through the action of the driving oil cylinder. If it is not fully engaged due to angle reasons, only the high-speed shaft brake needs to be released, and the impeller can rotate a very small angle in the free rotation state to achieve full engagement, without the need for a complicated hole alignment process. Due to the speed increasing effect of the gearbox, only a very small locking force of the support arm on the high-speed shaft side is required to achieve reliable locking of the impeller, and the mechanism is simple and lightweight. Since the locking force is smaller and the locking structure is simpler, it is more reliable than the impeller lock, with a smaller possibility of being unable to withdraw, and the difficulty of post-treatment after jamming is also smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of the present invention, and the schematic embodiments and descriptions thereof are used to explain the present invention without unduly limiting the present invention. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the braking and locking system for the drive train of a wind turbine provided by an embodiment of the present invention in the locked state;

[0022] Figure 2 is a schematic diagram of the braking and locking system for the drive train of a wind turbine provided by an embodiment of the present invention in the unlocked state;

[0023] Figure 3 is a sectional view of the connection part between the support and the support arm in the braking and locking system for the drive train of a wind turbine provided by an embodiment of the present invention;

[0024] Figure 4 is a sectional view of the connection part between the piston rod of the driving oil cylinder and the support arm in the braking and locking system for the drive train of a wind turbine provided by an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of the support arm in the braking and locking system for the drive train of a wind turbine provided by an embodiment of the present invention.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS:

[0027] 1 - coupling brake disc, 2 - high-speed shaft brake, 3 - support, 4 - support arm, 5 - driving oil cylinder, 6 - positioning pin, 7 - first pin shaft, 8 - self-lubricating bushing, 9 - ball hinge earring, 10 - second pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0029] The technical solutions provided by the embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0030] In a first aspect, an embodiment of the present invention provides a braking and locking system for a wind turbine drive train, as shown in the attached Figures 1 to 5 figures, including: a coupling brake disc 1, a high-speed shaft brake 2, a support 3, a support arm 4, a drive cylinder 5, and a locking member; the outer ring of the coupling brake disc 1 is serrated, the high-speed shaft brake 2 is arranged at the outer edge of the coupling brake disc 1, one end of the support 3 is connected to the high-speed shaft brake 2, and the middle of the support arm 4 is rotatably connected to the other end of the support 3; the cylinder body of the drive cylinder 5 is arranged at the bottom of the high-speed shaft brake 2, the piston rod extends downward and is connected to one end of the support arm 4, and the other end of the support arm 4 is serrated and faces the coupling brake disc 1, and is used to rotate to engage with the coupling brake disc 1 under the drive of the drive cylinder 5 or rotate away from the coupling brake disc 1 under the drive of the drive cylinder 5 to disengage; the locking member is used to detachably lock the position of the support arm 4 after the support arm 4 and the coupling brake disc 1 are engaged.

[0031] The working principle of the braking and locking system for the wind turbine drive train provided by the embodiments of the present invention will be described below:

[0032] One end of the support 3 is connected to the high-speed shaft brake 2, and the other end extends outward to serve as the pivot point for the rotation of the support arm 4. One end of the support arm 4 is connected to the piston rod of the drive cylinder 5, and the other end faces the coupling brake disc 1 and is provided with a tooth-shaped structure adapted to the coupling brake disc 1, and can engage with the coupling brake disc 1 after the coupling brake disc 1 stops rotating for locking. After engagement, the support arm 4 is held in a fixed position through the locking member, that is, the support arm 4 and the coupling brake disc 1 are always kept engaged. The working process is as follows: after the coupling brake disc 1 stops rotating, the piston rod of the drive cylinder 5 moves downward, driving the support arm 4 to rotate in the direction close to the coupling brake disc 1 with the end of the support 3 as the pivot point. After the support arm 4 rotates to engage with the coupling brake disc 1, the locking member is installed to complete the locking, and the maintenance operation starts. After the maintenance operation is completed, the locking member is disassembled. The piston rod of the drive cylinder 5 moves upward, driving the support arm 4 to rotate in the direction away from the coupling brake disc 1 with the end of the support 3 as the pivot point, and the support arm 4 disengages from the coupling brake disc 1.

[0033] In summary, the wind turbine transmission chain brake locking system provided by the embodiment of the present invention, after the coupling brake disc 1 stops rotating, the support arm 4 is engaged with the gear ring of the coupling brake disc 1 by driving the action of the oil cylinder 5. If it is not fully engaged due to angle reasons, it is only necessary to loosen the high-speed shaft brake 2, and the impeller can be fully engaged by rotating a very small angle in a free-rotating state without the need for a complicated hole alignment process. Due to the speed-increasing effect of the gearbox, the high-speed shaft side only requires a very small locking force from the support arm 4 to achieve reliable locking of the impeller, and the mechanism is simple and lightweight. Since the locking force is smaller and the locking structure is simpler, it is more reliable than the impeller lock, and the possibility of being unable to exit is smaller, and the difficulty of handling after getting stuck is also smaller.

[0034] In some optional implementations of this embodiment, as shown in the attached Figure 1 and 2 As shown, there are two support arms 4 and correspondingly two supports 3, symmetrically arranged on either side of the high-speed shaft brake 2. The two support arms 4 form a V-shaped structure to lock the coupling brake disc 1. This arrangement ensures that the two support arms 4 and two supports 3 are positioned on either side of the high-speed shaft brake 2, with each support 3 supporting a support arm 4. The piston rod of the drive cylinder 5 is connected to one end of both support arms 4. The other ends of the two support arms 4 extend from either side of the coupling brake disc 1, facing the coupling brake disc 1, forming a V-shaped locking structure. This arrangement ensures uniform force distribution and a better locking effect.

[0035] In some optional implementations of this embodiment, as shown in the attached Figure 3 As shown, the locking member includes a locating pin 6. Corresponding through-holes are provided on the support arm 4 and the support base 3. After the support arm 4 engages with the coupling brake disc 1, the through-holes on the support arm 4 and the support base 3 are aligned, and the locating pin 6 is inserted into the corresponding through-hole to lock the support arm. As the support arm 4 rotates around the end of the support base 3, the relative position between the support arm 4 and the support base 3 changes. When the support arm 4 engages with the coupling brake disc 1, inserting the locating pin 6 maintains the support arm 4 at a fixed angle, maintaining engagement with the coupling brake disc 1. After inspection and maintenance work is completed, simply pull out the locating pin and retract the cylinder to disengage the gears and release the impeller.

[0036] Specifically, the transmission chain structure of a doubly-fed wind turbine generator system is as follows: the impeller is connected to the gearbox via a main shaft, which increases the speed. The gearbox output shaft is connected to the generator via a coupling. The impeller lock operates before the gearbox, requiring significant wind loads to lock the impeller. However, the embodiment of the present invention operates after the gearbox. Because the gearbox acts as a speed increaser, only a small locking force is required to overcome significant wind loads and lock the impeller.

[0037] Optionally, an open split pin is detachably provided at the end of the positioning pin 6. With such a setting, after the positioning pin 6 is inserted into the through holes on the support arm 4 and the support 3, the open split pin is inserted at the end of the positioning pin 6 to prevent the positioning pin 6 from falling off. When it is necessary to pull out the positioning pin 6, the open split pin is pulled out first. By providing the open split pin, the stability and safety are improved.

[0038] It can be understood that a perforation can be provided at the end of the positioning pin 6, and the axis of the perforation is perpendicular to the axis of the positioning pin 6, so that after the open split pin is inserted, it is perpendicular to the positioning pin 6 and parallel or abuts against the side surfaces of the support arm 4 and the support 3.

[0039] In some alternative implementation manners of this embodiment, as shown in the attached Figure 3 figure, the end of the support 3 is connected to the support arm 4 by a first pin shaft 7, so that the support arm 4 can rotate around the end of the support 3. Specifically, when the support arm 4 rotates, it rotates around the first pin shaft 7.

[0040] As shown in the attached Figure 3 figure, the end of the support 3 is a fork body, the support arm 4 passes through the fork body at the end of the support 3, and corresponding through holes can be provided on the support arm 4 and the fork body. The first pin shaft 7 passes through the through holes on the support arm 4 and the fork body, so that the support arm 4 can rotate around the first pin shaft 7.

[0041] To reduce the rotational resistance, as shown in the attached Figure 3 figure, a self-lubricating bushing 8 is sleeved on the first pin shaft 7, that is, a self-lubricating bushing 8 can be provided between the first pin shaft 7 and the support arm 4. The self-lubricating bushing 8 can be a self-lubricating bushing 8 containing graphite solid lubricant, or other forms of self-lubricating bushings 8, as long as it can achieve lubrication for easy rotation.

[0042] Optionally, to prevent the first pin shaft 7 from falling off, an open split pin is provided at the end of the first pin shaft 7.

[0043] In some alternative implementation manners of this embodiment, as shown in the attached Figure 4 figure, the end of the piston rod of the driving oil cylinder 5 is connected with a spherical hinge earring 9. Corresponding through holes are provided on the end of the support arm 4 and the spherical hinge earring 9. The second pin shaft 10 is inserted and fixed in the corresponding through holes. The through hole on the support arm 4 is an oblong hole. With such a setting, the end of the support arm 4 is rotatably connected to the piston rod of the driving oil cylinder 5. During the up and down movement of the end of the support arm 4 driven by the piston rod of the driving oil cylinder 5, the support arm 4 keeps rotating around the support 3.

[0044] Among them, the upper part of the piston rod of the driving oil cylinder 5 and the spherical hinge earring 9 can be threadedly connected. The lower part of the spherical hinge earring 9 is connected to the ends of the two support arms 4. One ends of the two support arms 4 can be bent in different directions respectively, so that the two support arms 4 are located in the same plane as a whole, and a space for accommodating the spherical hinge earring 9 is reserved at intervals at the ends.

[0045] Optionally, as shown in the appended Figure 5 figure, the end of the support arm 4 is a long hole. When the piston rod of the driving oil cylinder 5 drives the end of the support arm 4 to move up and down, the second pin 10 can slide within the long hole, such that during the up and down movement of the end of the support arm 4, the support arm 4 maintains rotation about the first pin 7.

[0046] Optionally, in order to prevent the second pin 10 from falling off, an open pin is provided at the end of the second pin 10.

[0047] In some alternative implementation manners of this embodiment, the wind turbine drive train braking and locking system further includes a control module, which is configured to automatically control the action of the driving oil cylinder 5 after detecting that the coupling brake disc 1 has stopped rotating. By providing the control module, automatic control of the locking process is achieved, reducing manpower consumption.

[0048] Wherein, a rotational speed detection sensor may be provided on the coupling brake disc 1. After detecting that the coupling brake disc 1 has stopped rotating, an induction signal is sent to the control module, and at this time the control module controls the driving oil cylinder 5 to act.

[0049] In a second aspect, an embodiment of the present invention provides a method for using a wind turbine drive train braking and locking system as described in any one of the above, including:

[0050] After the coupling brake disc 1 stops rotating, the piston rod of the driving oil cylinder 5 moves downward, driving the support arm 4 to rotate in a direction close to the coupling brake disc 1 with the end of the support 3 (specifically, it may be the first pin 7) as a fulcrum.

[0051] After the support arm 4 rotates to engage with the coupling brake disc 1, a locking member is installed to complete the locking, and maintenance operations are started;

[0052] After the maintenance operations are completed, the locking member is removed.

[0053] The piston rod of the driving oil cylinder 5 moves upward, driving the support arm 4 to rotate in a direction away from the coupling brake disc 1 with the end of the support 3 (specifically, it may be the first pin 7) as a fulcrum, and the support arm 4 disengages from the coupling brake disc 1.

[0054] The usage method of the wind turbine drive train braking and locking system provided by the embodiments of the present invention is as follows. After the coupling brake disc 1 stops rotating, the support arm 4 is engaged with the gear ring of the coupling brake disc 1 by the action of the driving oil cylinder 5. If it is not fully engaged due to angle reasons, only the high-speed shaft brake 2 needs to be released, and the impeller can rotate a very small angle in the free rotation state to achieve full engagement, without the need for a complicated hole alignment process. And due to the speed increasing effect of the gearbox, only a very small locking force of the support arm 4 on the high-speed shaft side is required to reliably lock the impeller, and the mechanism is simple and lightweight. Since the locking force is smaller and the locking structure is simpler, it is more reliable than the impeller lock, with a smaller possibility of being unable to withdraw, and the post-treatment difficulty in case of jamming is also smaller.

[0055] It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. In addition, in this article, "front", "rear", "left", "right", "upper" and "lower" are all referred to the placement state shown in the drawings.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A braking and locking system for a wind turbine drive train, characterized in that, Comprising: A coupling brake disc, a high-speed shaft brake, a support, a support arm, a driving oil cylinder and a locking member; The outer ring of the coupling brake disc is serrated, the high-speed shaft brake is arranged at the outer edge of the coupling brake disc, one end of the support is connected to the high-speed shaft brake, and the middle of the support arm is rotatably connected to the other end of the support; The cylinder body of the driving oil cylinder is arranged at the bottom of the high-speed shaft brake, the piston rod extends downward and is connected to one end of the support arm, the other end of the support arm is serrated and faces the coupling brake disc, and is used to rotate to engage with the coupling brake disc under the drive of the driving oil cylinder or rotate away from the coupling brake disc under the drive of the driving oil cylinder to disengage; The locking member is used to detachably lock the position of the support arm after the support arm and the coupling brake disc are engaged; The number of the support arms is 2, correspondingly, the number of the supports is 2, and they are symmetrically arranged on both sides of the high-speed shaft brake. The two support arms are in a V-shaped structure to hold the coupling brake disc; The locking member includes a positioning pin. Corresponding through holes are respectively arranged on the support arm and the support. After the support arm and the coupling brake disc are engaged, the through holes on the support arm and the support are aligned, and the positioning pin is inserted into the corresponding through hole for locking; The end of the piston rod of the driving oil cylinder is connected with a spherical hinge earring. Corresponding through holes are arranged on the end of the support arm and the spherical hinge earring. The second pin shaft is inserted and fixed in the corresponding through hole, and the through hole on the support arm is an oblong hole.

2. The braking and locking system for the drive train of a wind turbine according to claim 1, wherein, An open pin is detachably arranged at the end of the positioning pin.

3. The wind turbine drive train braking and locking system according to claim 1, characterized in that, The end of the support is connected to the support arm through a first pin shaft.

4. The braking and locking system for the drive train of a wind turbine according to claim 3, wherein A self-lubricating bushing is sleeved on the first pin shaft.

5. The braking and locking system for the drive train of a wind turbine according to claim 4, wherein An open pin is arranged at the end of the first pin shaft; and / or, an open pin is arranged at the end of the second pin shaft.

6. The braking and locking system for the drive train of a wind turbine according to claim 1, characterized in that, It further includes a control module, which is used to automatically control the action of the driving oil cylinder after detecting that the coupling brake disc stops rotating.

7. A method for using a braking and locking system of a wind turbine drive train according to any one of claims 1-6, characterized in that, Comprising: After the coupling brake disc stops rotating, the piston rod of the driving oil cylinder moves downward, driving the support arm to rotate towards the coupling brake disc with the end of the support as the fulcrum; After the support arm rotates to engage with the coupling brake disc, the locking member is installed to complete the locking, and the overhaul and maintenance operation starts; After the overhaul and maintenance operation is completed, the locking member is disassembled; The piston rod of the driving oil cylinder moves upward, driving the support arm to rotate away from the coupling brake disc with the end of the support as the fulcrum, and the support arm disengages from the coupling brake disc.

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