A wind turbine with an angle adjustment mechanism

Abstract

The application belongs to the technical field of wind driven generators, and particularly relates to a wind driven generator with an angle adjusting mechanism, which comprises a generator cabin installed at the top of a vertical rod, a blade rotatably connected in a mounting portion, and a mounting portion rotatably connected at the end of the generator cabin; the mounting portion comprises a head, a base, and a transmission shaft; a second spring is added between a servo motor and a lifting plate, which causes greater pressure on the torque of the servo motor, but can break through the magnetic hysteresis resistance torque in the servo motor in the case of shutdown, power failure or failure of the servo motor, so as to rapidly drive the lifting plate to reset, and the reset of the lifting plate to the defined safety position can reduce the response time of the equipment and improve the response speed in the case of extreme weather and servo motor failure, so as to ensure the blade to be feathered, thereby avoiding damage or destruction of the wind driven generator.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind driven generators, in particular to a wind driven generator with an angle adjusting mechanism. BACKGROUND

[0002] The variable pitch device of a wind driven generator is one of its core components, and its main function is to adjust the angle of the blades to adapt to different wind speeds and directions, thereby optimizing power generation efficiency and protecting the generator.

[0003] A wind driven generator set variable pitch device is disclosed in a Chinese patent with publication number CN222363092U, which comprises a shell and a head, the head is fixedly connected to the shell, a support is arranged inside the shell, the support is fixedly connected to the inner wall of the shell, vertical plates are fixedly connected to the support at equal intervals, adjusting grooves are formed in the vertical plates, and a driving mechanism is arranged on the support; the driving mechanism is used to drive the angle rotation of the blades to realize the variable pitch effect. The beneficial effects of the utility model lie in that the driving mechanism can drive the movement of the lifting plate, the movement of the lifting plate drives the movement of the bent rod, the bent rod drives the movement of the connecting rod, thereby realizing the variable pitch operation of the blades. Compared with the traditional device, the device has the characteristics of convenient operation and simple structure, and the overall structure is stable and reliable, and is not prone to failure, so it can have a long service life.

[0004] In the above-mentioned prior art, a multi-link mechanism can be driven by a servo motor to drive the synchronous variable pitch adjustment of multiple blades. Compared with the planetary gear set driven blade synchronous variable pitch action, the single wire rod, lifting plate and connecting rod mechanism is used to replace the traditional gear box, the number of parts is greatly reduced, and the mechanical complexity is reduced. However, when the servo motor fails or stops, if extreme weather conditions occur and the blades are not adjusted to the pitch, the wind driven generator blades will be damaged. Therefore, the servo motor is relied on to adjust the blade variable pitch, and the emergency pitch action under the attention condition is also needed.

[0005] Therefore, the application provides a wind driven generator with an angle adjusting mechanism. SUMMARY

[0006] In order to make up for the shortcomings of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical solution adopted by the application to solve its technical problems is that the wind driven generator with an angle adjusting mechanism comprises:

[0008] a generator cabin installed at the top of the vertical rod, and

[0009] a mounting portion rotatably connected to the end of the generator cabin;

[0010] a blade rotatably connected to the mounting portion.

[0011] The mounting part includes a head, a base, and a drive shaft; the head is fixed to one side of the base, and the drive shaft is fixed to the center of the other side of the base;

[0012] It also includes an adjustment mechanism for adjusting blade pitch;

[0013] The adjustment unit includes a servo motor, a ball screw, a lifting plate, a ball nut, a second spring, and a transmission unit;

[0014] The output end of the servo motor is fixedly connected to a ball screw, and the ball nut is engaged with the lifting plate; the ball screw and the ball nut are threaded together, and the ball screw passes through the lifting plate; the second spring is disposed between the servo motor and the lifting plate, and the second spring is sleeved on the outside of the ball screw; the transmission part is used to convert the displacement of the lifting plate into blade angle adjustment.

[0015] Preferably, the adjustment part further includes a support plate, a side plate, and a support unit; the support unit is fastened to the side plate and fixedly connected to the base, and the transmission part is disposed between the support unit and the side plate; the support plate is fixedly connected to the top of the side plate; three assemblies formed by the support unit and the side plate are arranged in a circumferential array, corresponding to three sets of blades; the ball screw passes through the support plate, and the bottom of the ball screw is rotatably connected to one side of the base; the two ends of the second spring are respectively fixedly connected between the support plate and the lifting plate.

[0016] Preferably, the transmission part includes a connecting arm, a transmission rod, and a swing arm; the side plate is vertically provided with an oblong groove and a connecting hole in sequence; a connecting rod corresponding to the oblong groove is fixedly connected to the side wall of the lifting plate, a connector is slidably connected in the oblong groove, and the connecting rod passes through the oblong groove and the connector; one end of the connecting arm is hinged to the connecting rod, and the other end of the connecting arm is hinged to the swing arm; one end of the swing arm is fixedly connected to the transmission rod, and the other end is hinged to the connecting arm; the transmission rod passes horizontally through the support part and the connecting hole in sequence.

[0017] Preferably, the side plate is configured as an L-shaped structure, and the bottom of the side plate has symmetrically arranged embedding holes. A protrusion is provided between two of the embedding holes, and the protrusion is welded to the side plate. An embedding plate is fixedly connected to one side of the support, and the embedding plate is engaged with the embedding hole. The swing arm abuts against the protrusion.

[0018] Preferably, one end of the transmission rod passes through the support and the connecting hole, and the other end is inserted into the blade.

[0019] Preferably, the lifting plate has a clearance hole in the middle, and the ball screw passes through the clearance hole. The ball nut abuts against the top of the lifting plate and is arranged coaxially with the clearance hole on the lifting plate. An emergency unit is slidably connected inside the lifting plate, and the ball nut and the lifting plate are engaged by the emergency unit.

[0020] Preferably, the emergency unit includes a slide rod, a support plate, a bent rod, and a first spring; the slide rod is slidably connected to the lifting plate, and the support plate is fixed to one end of the slide rod, the bent rod is fixed to the other end of the slide rod, and the bent rod is arranged perpendicular to the slide rod; the first spring is sleeved on the slide rod, and the two ends of the first spring are fixed between the side wall of the lifting plate and the support plate; the bent rod is engaged with the side wall of the ball nut.

[0021] Preferably, the ball nut sidewall has an access hole corresponding to the bent rod, and the ball nut sidewall adjacent to the access hole also has a groove, an electromagnet is provided in the groove, and the output shaft of the electromagnet passes through the ball nut sidewall and extends into the access hole;

[0022] The bent rod has a slot corresponding to the output shaft of the electromagnet; the slot on the bent rod engages with the output shaft of the electromagnet in the access hole.

[0023] Preferably, a limiting rod is also fixedly connected to the base; a through hole is provided on the lifting plate, and the limiting rod passes through the through hole.

[0024] Preferably, three connecting rods are provided on the lifting plate, corresponding to three connecting parts, and three sets of emergency parts are also provided, which are arranged alternately with the connecting rods.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The wind turbine generator with an angle adjustment mechanism described in this invention, by adding a second spring between the servo motor and the lifting plate, although it puts greater pressure on the torque of the servo motor, can overcome the magnetic hysteresis torque in the servo motor in the event of servo motor shutdown, power failure, or malfunction, thereby quickly driving the lifting plate to reset. The reset of the lifting plate is defined as the safe position. After the second spring drives the lifting plate to reset, through automated control, the equipment response time can be reduced, the response speed can be improved in extreme weather and servo motor failure situations, the blade feathering can be ensured, and emergency safety issues in extreme weather and servo motor failure situations can be addressed, thereby avoiding damage or destruction of the wind turbine generator.

[0027] 2. The wind turbine generator with an angle adjustment mechanism described in this invention shares the same safety circuit power supply between the servo motor and the electromagnet. When the servo motor fails, the safety relay cuts off the power, causing the servo motor and the electromagnet to lose power synchronously. After the electromagnet loses power, the output shaft of the electromagnet retracts. At this time, under the action of the first spring, the slide bar can be pulled outward, causing the bent rod to move outward synchronously with the slide bar. Under the elastic force of the second spring, the lifting plate separates from the ball nut and quickly resets, thereby completing the feathering action under abnormal working conditions and extreme weather conditions. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a perspective view of the present invention;

[0030] Figure 2 This is a partial perspective view of the present invention;

[0031] Figure 3 This is a perspective view of the adjustment part in this invention;

[0032] Figure 4 This is an exploded view of the adjusting part in this invention;

[0033] Figure 5 This is a top view of the adjustment section of the present invention;

[0034] Figure 6 This is a diagram showing the fit between the support portion and the side plate in this invention;

[0035] Figure 7 This is a diagram showing the fit between the ball nut and the lifting plate in this invention;

[0036] In the diagram: 1. Upright pole; 2. Generator compartment; 3. Mounting part; 31. End cap; 32. Base; 321. Limiting rod; 33. Drive shaft; 4. Blade; 5. Adjusting part; 50. Servo motor; 51. Support plate; 52. Side plate; 521. Oval groove; 522. Connecting arm; 523. Connecting head; 524. Protrusion; 525. Connecting hole; 526. Embedded hole; 53. Support part; 531. Embedded part 54. Insert plate; 541. Transmission rod; 55. Swing arm; 56. Ball screw; 57. Lifting plate; 58. Connecting rod; 59. Clearance hole; 50. Through hole; 51. Emergency unit; 52. Support plate; 53. Slide rod; 54. First spring; 55. Bend rod; 56. Slot; 57. Ball nut; 58. Groove; 59. Electromagnet; 50. Second spring. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 4 As shown in the figure, a wind turbine generator with an angle adjustment mechanism according to an embodiment of the present invention includes a generator nacelle 2 mounted on the top of a pole 1, blades 4 rotatably connected to a mounting part 3, and a mounting part 3 rotatably connected to the end of the generator nacelle 2; the mounting part 3 includes a head 31, a base 32, and a drive shaft 33; the head 31 is fixed to one side of the base 32, and the drive shaft 33 is fixed to the center of the other side of the base 32;

[0039] It also includes an adjustment unit 5 for adjusting the pitch of the blade 4; the adjustment unit 5 includes a servo motor 50, a ball screw 55, a lifting plate 56, a ball nut 58, a second spring 59, and a transmission unit; the output end of the servo motor 50 is fixedly connected to the ball screw 55, and the ball nut 58 is engaged with the lifting plate 56; the ball screw 55 and the ball nut 58 are threaded together, and the ball screw 55 passes through the lifting plate 56; the second spring 59 is disposed between the servo motor 50 and the lifting plate 56, and the second spring 59 is sleeved on the outside of the ball screw 55; the transmission unit is used to convert the displacement of the lifting plate 56 into the adjustment of the blade 4 angle.

[0040] In the aforementioned prior art, a servo motor can drive a multi-link mechanism to drive multiple blades to adjust pitch synchronously. Compared with the synchronous pitch action of blades driven by a planetary gear set, the use of a single screw, lifting plate and linkage mechanism to replace the traditional gearbox greatly reduces the number of parts and reduces mechanical complexity. However, if the servo motor fails or stops, and extreme weather conditions occur and the blades are not adjusted to feather, the wind turbine blades will be damaged. Therefore, relying on the servo motor to adjust the blade pitch also requires attention to emergency feathering action in unexpected situations.

[0041] In one embodiment, compared with the prior art, a second spring 59 is added between the servo motor 50 and the lifting plate 56. Under normal operating conditions and in a normal environment, the servo motor 50 drives the ball screw 55 to rotate, which in turn drives the lifting plate 56 to move through the ball nut 58. When the lifting plate 56 moves, the displacement can be converted into the required adjustment angle of the blade 4 through the transmission unit. The movement of the lifting plate 56 corresponds to the rotation adjustment angle of the blade 4. In this embodiment, the displacement of the lifting plate 56 synchronously drives the three transmission units to start, thereby synchronously adjusting the pitch of the three blades 4. In addition, a second spring 59 is added in this embodiment. Under abnormal operating conditions and in abnormal environmental conditions, such as strong winds, the wind speed monitored by the sensor exceeds the theoretical value, and the generator may be overloaded or the blade 4 may be damaged due to excessive resistance. At this time, it is necessary to adjust the blade 4 to feather. However, due to the failure of the servo motor 50, it cannot respond to the action. In one embodiment, when the above situation occurs, the rotor electromagnetic field of the servo motor 50 fails, and the elastic force of the second spring 59 can drive the lifting plate 56 to quickly reset, thereby feathering the blade 4 to cope with extreme operating conditions and the failure of the servo motor 50.

[0042] It is worth noting that, in the above description, when the lifting plate 56 is reset, the second spring 59 has the least elastic force. When the lifting plate 56 starts to move through the cooperation of the ball nut 58 and the ball screw 55, the second spring 59 will be compressed, thereby generating stored force. However, when the servo motor 50 is running normally, it can perform real-time torque control. While controlling the rotation of the ball screw 55, it can also resist the elastic force of the second spring 59 and maintain the position of the lifting plate 56 unchanged. However, after the servo motor 50 fails, is powered off, or malfunctions, the rotor electromagnetic field fails and can no longer resist the elastic force of the second spring 59. At this time, the second spring 59 relies on its elastic force to quickly drive the lifting plate 56 to reset.

[0043] Based on the above, in one embodiment, by adding a second spring 59 between the servo motor 50 and the lifting plate 56, although it puts greater pressure on the torque of the servo motor 50, it can overcome the hysteresis torque inside the servo motor 50 in the event of a shutdown, power failure, or malfunction of the servo motor 50, thereby quickly driving the lifting plate 56 to reset. The reset of the lifting plate 56 is defined as the safe position. After the second spring 59 drives the lifting plate 56 to reset, through automated control, the equipment response time can be reduced, and the response speed can be improved in extreme weather and servo motor 50 failure situations. This can ensure the feathering of the blade 4 and cope with emergency safety issues in extreme weather and servo motor 50 failure situations, thereby avoiding damage or destruction of the wind turbine.

[0044] like Figures 1 to 6As shown, the adjustment part 5 also includes a support plate 51, a side plate 52, and a support part 53; the support part 53 is fastened to the side plate 52 and fixedly connected to the base 32, and the transmission part is disposed between the support part 53 and the side plate 52; the support plate 51 is fixedly connected to the top of the side plate 52; three assemblies formed by the support part 53 and the side plate 52 are arranged in a circumferential array, corresponding to three sets of blades 4; the ball screw 55 passes through the support plate 51, and the bottom of the ball screw 55 is rotatably connected to one side of the base 32; the two ends of the second spring 59 are respectively fixedly connected between the support plate 51 and the lifting plate 56.

[0045] As described above, under normal operating conditions of the servo motor 50, in one embodiment, the specific action of the blade 4 pitching is as follows:

[0046] The servo motor 50 starts and drives the ball screw 55 to rotate. The bottom of the ball screw 55 is supported and limited by the base 32. The rotation of the ball screw 55 cooperates with the ball nut 58, which drives the lifting plate 56 to move. When the lifting plate 56 moves, it drives the transmission part to deform. The deformation of the transmission part can complete the pitch change of the blade 4. In this embodiment, the support plate 51 is used to support the servo motor 50, and the side plate 52 is used to ensure the stability of the adjustment part 5 during operation, and at the same time to provide support and limit for the deformation of the transmission part. In addition, the support part 53 is used to cooperate with the side plate 52 to ensure the stability of the transmission part during deformation. Based on the above, the stability and controllability of the synchronous pitch change of the multi-blade 4 under the drive of the servo motor 50 are ensured by the setting of the adjustment part 5.

[0047] like Figures 1 to 6 As shown, the transmission unit includes a connecting arm 522, a transmission rod 54, and a swing arm 541; the side plate 52 is vertically provided with an oblong groove 521 and a connecting hole 525; a connecting rod 561 corresponding to the oblong groove 521 is fixedly connected to the side wall of the lifting plate 56, and a connector 523 is slidably connected in the oblong groove 521; the connecting rod 561 passes through the oblong groove 521 and the connector 523; one end of the connecting arm 522 is hinged to the connecting rod 561, and the other end of the connecting arm 522 is hinged to the swing arm 541; one end of the swing arm 541 is fixedly connected to the transmission rod 54, and the other end is hinged to the connecting arm 522; the transmission rod 54 passes horizontally through the support part 53 and the connecting hole 525.

[0048] As described above, when the lifting plate 56 is displaced by the ball nut 58, the connecting rod 561 on the side wall of the lifting plate 56 drives the connector 523 and one end of the connecting arm 522 to slide in the oblong groove 521. Since the connecting arm 522 has a fixed size, the swing arm 541 will also rotate synchronously during the process of the connecting arm 522 being driven by the connecting rod 561. It is worth noting that the swing arm 541 is fixed to the transmission rod 54, and the transmission rod 54 passes through the support part 53 and the connecting hole 525 in sequence. Therefore, the transmission rod 54 can only perform rotational movements on a fixed axis. When the swing arm 541 is displaced by the connecting rod 561, the swing arm 541 will rotate. After the arm 522 is driven, it can only drive the transmission rod 54 to rotate along the fixed axis. After the transmission rod 54 rotates along the fixed axis, the blade 4 can be driven to rotate along the fixed axis by the insertion and engagement relationship between the transmission rod 54 and the blade 4, thereby completing the pitch change. It should also be noted that, in the above embodiment, the rotation of the blade 4 along the fixed axis mainly depends on the connecting rod 561 on the side wall of the lifting plate 56 in conjunction with the transmission part. Therefore, when the lifting plate 56 is horizontally displaced, the three connecting rods 561 can synchronously drive the three sets of transmission parts to deform synchronously, thereby causing the three blades 4 to produce synchronous pitch change.

[0049] like Figures 1 to 6 As shown, the side plate 52 is configured as an L-shaped structure, and the bottom of the side plate 52 has symmetrically arranged embedding holes 526. A protrusion 524 is provided between the two embedding holes 526, and the protrusion 524 is welded to the side plate 52. An embedding plate 531 is fixedly connected to one side of the support part 53, and the embedding plate 531 is engaged with the embedding hole 526. The swing arm 541 abuts against the protrusion 524.

[0050] In one embodiment, the side plate 52 is snapped into the support portion 53, and the embedded plate 531 provided on the support portion 53 has a preset screw hole, which can be directly connected to the base 32 with screws to ensure that the support portion 53, the side plate 52 and the base 32 are fixed. In addition, the protrusion 524 provided on the side plate 52 can abut against the swing arm 541. Specifically, the rotation angle of the blade 4 is limited. When the rotation angle is too large, it may cause the cable to be stretched and damaged. Therefore, it is necessary to limit the rotation angle of the blade 4. In this embodiment, the protrusion 524 abuts against the swing arm 541, which can limit the swing arm 541 so that the swing arm 541 can only rotate within a certain angle.

[0051] like Figures 1 to 6 As shown, one end of the transmission rod 54 passes through the support part 53 and the connecting hole 525, and the other end is inserted into the blade 4.

[0052] like Figures 1 to 7As shown, the lifting plate 56 has a clearance hole 562 in the middle, and the ball screw 55 passes through the clearance hole 562. The ball nut 58 abuts against the top of the lifting plate 56 and is arranged coaxially with the clearance hole 562 on the lifting plate 56. An emergency part 57 is slidably connected inside the lifting plate 56, and the ball nut 58 and the lifting plate 56 are engaged by the emergency part 57.

[0053] In one embodiment, the ball nut 58 and the lifting plate 56 are in a snap-fit ​​relationship. The ball screw 55 passes through the ball nut 58 and also through the relief hole 562 in the middle of the lifting plate 56. It is worth noting that the ball screw 55 and the ball nut 58 are threaded together, and the ball screw 55 passes through the relief hole 562. The size of the relief hole 562 is larger than the outer diameter of the ball screw 55. When the lifting plate 56 quickly resets under the action of the second spring 59, the emergency unit 57 can separate the ball nut 58 from the lifting plate 56. At this time, the second spring 59 presses the lifting plate 56, which can make the lifting plate 56 quickly reset to the safe position without contacting the ball screw 55, thereby completing the rapid emergency action under abnormal working conditions and extreme weather conditions, and avoiding damage to the wind turbine.

[0054] like Figures 1 to 7 As shown, the emergency unit 57 includes a slide rod 572, a support plate 571, a bent rod 574, and a first spring 573; the slide rod 572 is slidably connected to the lifting plate 56, and the support plate 571 is fixedly connected to one end of the slide rod 572, and the bent rod 574 is fixedly connected to the other end of the slide rod 572, and the bent rod 574 is arranged perpendicular to the slide rod 572; the first spring 573 is sleeved on the slide rod 572, and both ends of the first spring 573 are fixedly connected between the side wall of the lifting plate 56 and the support plate 571; the bent rod 574 is engaged with the side wall of the ball nut 58.

[0055] like Figures 1 to 7 As shown, the ball nut 58 has an access hole 582 on its side wall corresponding to the bent rod 574. The ball nut 58 also has a groove 581 on its side wall adjacent to the access hole 582. An electromagnet 583 is installed in the groove 581, and the output shaft of the electromagnet 583 passes through the side wall of the ball nut 58 and extends into the access hole 582.

[0056] The bent rod 574 has a slot 575 corresponding to the output shaft of the electromagnet 583; the slot 575 on the bent rod 574 engages with the output shaft of the electromagnet 583 in the access hole 582.

[0057] As described above, under abnormal working conditions and extreme weather conditions, the servo motor 50 is in a fault state. Since the preset condition is that all electrical control equipment shares the same safety circuit power supply, that is, the servo motor 50 and the electromagnet 583 share the same safety circuit power supply, when the servo motor 50 fails, the safety relay will cut off the power supply, so that the servo motor 50 and the electromagnet 583 lose power synchronously. After the electromagnet 583 loses power, the output shaft of the electromagnet 583 retracts. At this time, under the action of the first spring 573, the slide bar 572 can be pulled to slide outward, so that the bent bar 574 moves outward synchronously with the slide bar 572. Under the elastic force of the second spring 59, the lifting plate 56 separates from the ball nut 58 and quickly resets, thereby completing the feathering action under abnormal working conditions and extreme weather conditions.

[0058] In addition, it should be noted that in one embodiment, the electromagnet 583 is preset to extend the output end when energized and retract when de-energized. Depending on the specific implementation, the electromagnet 583 can also be preset to retract the output end when energized and pop out the output end when de-energized. Only the cooperation method between the bent rod 574 and the access hole 582 needs to be changed, which will not be elaborated further here.

[0059] like Figures 1 to 4 As shown, a limiting rod 321 is also fixedly connected to the base 32; a through hole 563 is provided on the lifting plate 56, and the limiting rod 321 passes through the through hole 563.

[0060] like Figures 1 to 7 As shown, three connecting rods 561 are provided on the lifting plate 56, corresponding to three connecting parts. Three sets of emergency parts 57 are also provided, and they are arranged alternately with the connecting rods 561.

[0061] Working principle: A second spring 59 is added between the servo motor 50 and the lifting plate 56. Under normal operating conditions and in a normal environment, the servo motor 50 drives the ball screw 55 to rotate, which in turn moves the lifting plate 56 via the ball nut 58. When the lifting plate 56 moves, the displacement is converted into the required adjustment angle of the blade 4 through the transmission unit. The movement of the lifting plate 56 corresponds to the rotation adjustment angle of the blade 4. In this embodiment, the displacement of the lifting plate 56 synchronously drives the three transmission units to start, thereby synchronously adjusting the pitch of the three blades 4. In addition... In this embodiment, a second spring 59 is added. Under abnormal operating conditions and in abnormal environmental conditions, such as strong winds, the wind speed monitored by the sensor exceeds the theoretical value. The generator may be overloaded or the blade 4 may be damaged due to excessive resistance. At this time, it is necessary to adjust the blade 4 to feather. However, due to the failure of the servo motor 50, it cannot respond to the action. In one embodiment, when the above situation occurs, the rotor electromagnetic field of the servo motor 50 fails. The elastic force of the second spring 59 can drive the lifting plate 56 to quickly reset, thereby feathering the blade 4 to cope with extreme operating conditions and the failure of the servo motor 50.

[0062] It is worth noting that, in the above description, when the lifting plate 56 is reset, the second spring 59 has the least elastic force. When the lifting plate 56 starts to move through the cooperation of the ball nut 58 and the ball screw 55, the second spring 59 will be compressed, thereby generating stored force. However, when the servo motor 50 is running normally, it can perform real-time torque control. While controlling the rotation of the ball screw 55, it can also resist the elastic force of the second spring 59 and maintain the position of the lifting plate 56 unchanged. However, after the servo motor 50 fails, is powered off, or malfunctions, the rotor electromagnetic field fails and can no longer resist the elastic force of the second spring 59. At this time, the second spring 59 relies on its elastic force to quickly drive the lifting plate 56 to reset.

[0063] Based on the above, in one embodiment, by adding a second spring 59 between the servo motor 50 and the lifting plate 56, although it puts greater pressure on the torque of the servo motor 50, it can overcome the hysteresis torque within the servo motor 50 in the event of a shutdown, power outage, or malfunction of the servo motor 50, thereby quickly driving the lifting plate 56 to reset. The reset of the lifting plate 56 is defined as the safe position. After the second spring 59 drives the lifting plate 56 to reset, automated control can reduce equipment response time and improve response speed in extreme weather and servo motor 50 failure situations. This ensures the feathering of blade 4 and addresses emergency safety issues in extreme weather and servo motor 50 failure situations, thereby preventing damage or destruction of the wind turbine. The specific action of blade 4 pitching is as follows: The servo motor 50 starts and drives the ball screw 55 to rotate. The bottom of the ball screw 55 is supported and limited by the base 32. The rotation of the ball screw 55 cooperates with the ball nut 58, which drives the lifting plate 56 to move. When the lifting plate 56 moves, it can drive the transmission part to deform. The deformation of the transmission part can complete the pitch change of the blade 4. In this embodiment, the support plate 51 is used to support the servo motor 50, and the side plate 52 is used to ensure the stability of the adjustment part 5 during operation, and at the same time provide support and limit for the deformation of the transmission part. In addition, the support part 53 is used to cooperate with the side plate 52 to ensure the stability of the transmission part during deformation. Based on the above, the stability and controllability of the synchronous pitch change of the multi-blade 4 under the drive of the servo motor 50 are ensured by the setting of the adjustment part 5.

[0064] In abnormal operating conditions and extreme weather conditions, the servo motor 50 is in a fault state. Since the preset condition is that all electrical control equipment shares the same safety circuit power supply, that is, the servo motor 50 and the electromagnet 583 share the same safety circuit power supply, when the servo motor 50 fails, the safety relay will cut off the power supply, so that the servo motor 50 and the electromagnet 583 lose power synchronously. After the electromagnet 583 loses power, the output shaft of the electromagnet 583 retracts. At this time, under the action of the first spring 573, the slide bar 572 can be pulled to slide outward, so that the bent bar 574 moves outward synchronously with the slide bar 572. Under the elastic force of the second spring 59, the lifting plate 56 separates from the ball nut 58 and quickly resets, thereby completing the feathering action under abnormal operating conditions and extreme weather conditions.

[0065] In addition, it should be noted that in one embodiment, the electromagnet 583 is preset to extend the output end when energized and retract when de-energized. Depending on the specific implementation, the electromagnet 583 can also be preset to retract the output end when energized and pop out the output end when de-energized. Only the cooperation method between the bent rod 574 and the access hole 582 needs to be changed, which will not be elaborated further here.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine generator with an angle adjustment mechanism, characterized in that: include: The generator nacelle (2) is installed on top of the pole (1), and Rotary connection to the mounting part (3) at the end of the generator compartment (2); Rotate the blade (4) connected in the mounting part (3); The mounting part (3) includes a head (31), a base (32) and a drive shaft (33); the head (31) is fixed to one side of the base (32) and the drive shaft (33) is fixed to the center of the other side of the base (32); It also includes an adjustment unit (5) for adjusting the pitch of the blades (4); The adjustment unit (5) includes a servo motor (50), a ball screw (55), a lifting plate (56), a ball nut (58), a second spring (59), and a transmission unit; The output end of the servo motor (50) is fixedly connected to a ball screw (55), and the ball nut (58) is engaged with the lifting plate (56); the ball screw (55) and the ball nut (58) are threaded together, and the ball screw (55) passes through the lifting plate (56); the second spring (59) is disposed between the servo motor (50) and the lifting plate (56), and the second spring (59) is sleeved on the outside of the ball screw (55); the transmission part is used to convert the displacement of the lifting plate (56) into the angle adjustment of the blade (4); The lifting plate (56) has a clearance hole (562) in the middle, and the ball screw (55) passes through the clearance hole (562). The ball nut (58) abuts against the top of the lifting plate (56) and is arranged coaxially with the clearance hole (562) on the lifting plate (56). An emergency part (57) is slidably connected inside the lifting plate (56), and the ball nut (58) and the lifting plate (56) are engaged by the emergency part (57). The emergency unit (57) includes a slide rod (572), a support plate (571), a bent rod (574), and a first spring (573); the slide rod (572) is slidably connected to the lifting plate (56), and the support plate (571) is fixed to one end of the slide rod (572), the bent rod (574) is fixed to the other end of the slide rod (572), and the bent rod (574) is arranged perpendicular to the slide rod (572); the first spring (573) is sleeved on the slide rod (572), and both ends of the first spring (573) are fixed between the side wall of the lifting plate (56) and the support plate (571); the bent rod (574) is engaged with the side wall of the ball nut (58); The ball nut (58) has an access hole (582) on its side wall corresponding to the bent rod (574). The ball nut (58) also has a groove (581) on its side wall adjacent to the access hole (582). An electromagnet (583) is provided in the groove (581), and the output shaft of the electromagnet (583) passes through the side wall of the ball nut (58) and extends into the access hole (582). The bent rod (574) has a slot (575) corresponding to the output shaft of the electromagnet (583); the slot (575) on the bent rod (574) engages with the output shaft of the electromagnet (583) in the access hole (582); The servo motor (50) and the electromagnet (583) share the same safety circuit power supply.

2. A wind turbine generator with an angle adjustment mechanism according to claim 1, characterized in that: The adjustment part (5) also includes a support plate (51), a side plate (52) and a support part (53); the support part (53) is fastened to the side plate (52) and fixedly connected to the base (32), and the transmission part is set between the support part (53) and the side plate (52); the support plate (51) is fixedly connected to the top of the side plate (52); the combination formed by the support part (53) and the side plate (52) is arranged in three circumferential arrays, corresponding to three sets of blades (4); the ball screw (55) passes through the support plate (51), and the bottom of the ball screw (55) is rotatably connected to one side of the base (32); the two ends of the second spring (59) are respectively fixed between the support plate (51) and the lifting plate (56).

3. A wind turbine generator with an angle adjustment mechanism according to claim 2, characterized in that: The transmission unit includes a connecting arm (522), a transmission rod (54), and a swing arm (541); the side plate (52) is vertically provided with an oblong groove (521) and a connecting hole (525); the side wall of the lifting plate (56) is fixedly connected with a connecting rod (561) corresponding to the oblong groove (521), and a connector (523) is slidably connected in the oblong groove (521). The connecting rod (561) passes through the oblong groove (521) and the connector (523); one end of the connecting arm (522) is hinged to the connecting rod (561), and the other end of the connecting arm (522) is hinged to the swing arm (541); one end of the swing arm (541) is fixedly connected to the transmission rod (54), and the other end is hinged to the connecting arm (522); the transmission rod (54) passes horizontally through the support part (53) and the connecting hole (525).

4. A wind turbine generator with an angle adjustment mechanism according to claim 3, characterized in that: The side plate (52) is configured as an L-shaped structure, and the bottom of the side plate (52) is provided with symmetrically arranged embedding holes (526). A protrusion (524) is provided between the two embedding holes (526), ​​and the protrusion (524) is welded to the side plate (52). An embedding plate (531) is fixedly connected to one side of the support (53), and the embedding plate (531) is engaged with the embedding hole (526). The swing arm (541) abuts against the protrusion (524).

5. A wind turbine generator with an angle adjustment mechanism according to claim 4, characterized in that: One end of the transmission rod (54) passes through the support part (53) and the connecting hole (525), and the other end is inserted into the blade (4).

6. A wind turbine generator with an angle adjustment mechanism according to claim 5, characterized in that: A limiting rod (321) is also fixedly connected to the base (32); a through hole (563) is provided on the lifting plate (56), and the limiting rod (321) passes through the through hole (563).

7. A wind turbine generator with an angle adjustment mechanism according to claim 6, characterized in that: Three connecting rods (561) are provided on the lifting plate (56) and correspond to three connecting parts. Three sets of emergency parts (57) are also provided and are arranged alternately with the connecting rods (561).

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