High-speed shaft brake for wind power generation

Abstract

This utility model discloses a high-speed shaft brake for wind power generation, comprising a housing, a main shaft rotatably connected to one side of the housing, a main braking mechanism fixedly connected to the bottom of the inner wall of the housing, a secondary braking mechanism disposed inside the housing, with the main shaft passing through the main braking mechanism and the secondary braking mechanism, a controller fixedly connected to the inner wall of the housing, an extension box fixedly connected to the bottom of the housing, a motor fixedly connected to the inner wall of the extension box, and the motor output shaft passing through the inner wall of the extension box and extending into the housing, with a base fixedly connected to the bottom of the inner wall of the housing, a claw plate housing fixedly connected to the top of the base, three small bevel gears evenly penetrating the outer surface of the claw plate housing, and the small bevel gears rotatably connected to the claw plate housing, and three grippers slidably connected to one side of the claw plate housing. This utility model can not only brake the main shaft quickly, but also reduce the problem of reduced friction performance caused by friction overheating through alternating braking of the dual brakes.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic station pressure equalization technology, and in particular to a high-speed shaft brake for wind power generation. Background Technology

[0002] In existing technologies, the wind turbine main shaft is the core component of a wind turbine, connecting the wind turbine and the gearbox. It transmits the torque generated by the rotation of the blades to the transmission system to realize the conversion of wind energy into mechanical energy, bears the mechanical loads such as the weight of the wind turbine and aerodynamic loads, and maintains the alignment of the shaft system.

[0003] A search revealed a utility model patent with Chinese patent publication number CN219795446U, which discloses a braking device for a wind turbine. The device includes a drive motor mounted on a housing base, a fan blade rotating shaft rotatably connected to the housing base, two sets of wear-resistant sleeves spaced apart on the fan blade rotating shaft, and the fan blade rotating shaft driven by the drive motor. Two sets of support plates are fixedly connected to the housing base at intervals, each support plate having a sliding groove. Two sets of movable plates are slidably connected within the sliding grooves, and the two movable plates are driven by a power device. Two sets of damping rods are fixedly connected to the two movable plates at intervals, and brake plates corresponding to the wear-resistant sleeves are fixedly connected to the extended ends of the two damping rods. A buffer spring is provided between the brake plate and the movable plate. While this utility model increases friction by using a bidirectional lead screw to move the movable plate towards the rotating shaft, and can lock the fan blade rotating shaft with the buffer spring and other components, the friction braking through the brake plate and wear-resistant sleeves, under high-load braking, can cause the wear-resistant plates to overheat and decrease in friction coefficient. Furthermore, relying on a bidirectional lead screw to displace the brake plate results in a long mechanical transmission chain, making emergency braking impossible. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-speed shaft brake for wind power generation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-speed shaft brake for wind power generation includes a housing, a main shaft rotatably connected to one side of the housing, a main braking mechanism fixedly connected to the bottom of the inner wall of the housing, a secondary braking mechanism disposed inside the housing, and the main shaft passing through the main braking mechanism and the secondary braking mechanism. A controller is fixedly connected to the inner wall of the housing.

[0007] As a further embodiment of this utility model: an expansion box is fixedly connected to the bottom of the housing, a motor is fixedly connected to the inner wall of the expansion box, and the motor output shaft passes through the inner wall of the expansion box and extends into the housing.

[0008] As a further embodiment of this utility model: the main braking mechanism includes a claw disc housing, a small bevel gear, a friction plate, a gripper, a base, and a claw disc body, with the base fixedly connected to the bottom of the inner wall of the housing.

[0009] As a further embodiment of this utility model: the claw disk shell is fixedly connected to the top of the base, three small bevel gears are evenly penetrated through the outer surface of the claw disk shell, and the small bevel gears are rotatably connected to the claw disk shell, the three grippers are slidably connected to one side of the claw disk shell, and a rack is fixedly connected to one side of the gripper, the friction plate is fixedly connected to one side of the gripper, and the claw disk body is rotatably connected to the inner wall of the claw disk shell.

[0010] As a further embodiment of this utility model: a conical tooth is provided on one side of the claw disc body, and a planar thread is provided on the other side of the claw disc body. The conical tooth of the claw disc body meshes with a small bevel gear, and the planar thread on the other side of the claw disc body meshes with the rack of the gripper. One of the small bevel gears is fixedly connected to the motor output shaft.

[0011] As a further embodiment of this utility model: the auxiliary braking mechanism includes a connecting seat, a bracket, a spring hydraulic cylinder, an electromagnet one, an electromagnet two, a clamp, and a temperature sensor. The connecting seat is fixedly connected to the inner wall of the housing, and the two brackets are respectively fixedly connected to both sides of the connecting seat. Electromagnet one is fixedly connected to the bottom of each bracket.

[0012] As a further embodiment of this utility model: a spring hydraulic cylinder is fixedly connected to the bottom of the connecting seat, a clamp is fixedly connected to the telescopic end of the spring hydraulic cylinder, an electromagnet is fixedly connected to the top of the clamp, and the electromagnet is opposite to the magnetic pole of the first electromagnet. The connecting seat, bracket, spring hydraulic cylinder, electromagnet, electromagnet and clamp form an upper and lower symmetrical structure with the reference plane where the midpoint of the main shaft axis is located as the mirror plane. The temperature sensor is fixedly connected to the top of the connecting seat near the bottom of the inner wall of the housing.

[0013] Compared with the prior art, this utility model provides a high-speed shaft brake for wind power generation, which has the following advantages:

[0014] 1. When braking the spindle is required, the motor is started. The motor drives the main braking mechanism to clamp and brake the spindle. During this process, the auxiliary braking mechanism continuously monitors the temperature of the contact area between the main braking mechanism and the spindle and transmits the temperature signal to the controller in real time. When the monitored temperature exceeds the preset threshold, the controller sends a reverse command to the motor, driving the main braking mechanism to return to the initial position and release the brake on the spindle. Simultaneously, the auxiliary braking mechanism is activated, allowing it to quickly clamp the spindle. When the temperature drops to a safe range, the controller controls the auxiliary braking mechanism to release the brake, and the motor rotates forward to reset, allowing the main braking mechanism to resume its working state. This avoids the failure risk caused by overheating in traditional single-path braking systems and significantly improves braking reliability.

[0015] 2. When braking of the spindle is required, the motor starts and drives the small bevel gear to rotate. At this time, the small bevel gear drives the claw disc body to make circular motion inside the claw disc housing. During this process, because the planar thread of the claw disc body meshes with the rack of the jaw, the rotational motion of the claw disc body is converted into the linear motion of the jaw, which gradually approaches the center of the claw disc housing. The jaw drives the friction plate to adhere to the surface of the spindle, and braking is achieved through friction. Since the three sets of jaws are driven by the same planar thread, the radial force can be evenly distributed during braking. Therefore, the helix angle design of the planar thread can produce a self-locking effect, ensuring that it will not loosen after clamping, and the response speed is fast, meeting the requirements of rapid response for emergency braking.

[0016] 3. When the main braking mechanism is engaged, the temperature sensor monitors the temperature of the contact area between the friction pads and the main shaft in real time. Once the detected value exceeds the preset threshold, the temperature signal is transmitted to the controller. The controller first controls the motor to reverse, causing the gripper to move away from the main shaft. At the same time, the controller de-energizes electromagnet one and electromagnet two. At this time, electromagnet one and electromagnet two no longer attract each other, and the extension end of the spring hydraulic cylinder gradually extends, driving the clamp to approach and contact the outer wall of the main shaft. Conversely, when the temperature sensor detects that the temperature at the contact point between the main braking mechanism and the main shaft has dropped to a normal value, the controller energizes electromagnet two and electromagnet one. Electromagnet two and electromagnet one attract each other, and at the same time, the clamp squeezes the extension end of the spring hydraulic cylinder away from the main shaft. Thus, a cyclic cooling effect of alternating heat dissipation between the main and auxiliary components is achieved, while braking the main shaft, reducing the wear on the friction pads of the main braking mechanism, and preventing the friction pads from overheating and reducing friction efficiency.

[0017] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0018] Figure 1 This is a front view of a high-speed shaft brake for wind power generation proposed in this utility model;

[0019] Figure 2 This is a longitudinal sectional view of a high-speed shaft brake for wind power generation proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the main braking mechanism in a high-speed shaft brake for wind power generation proposed in this utility model.

[0021] Figure 4 This is an exploded view of the main braking mechanism in a high-speed shaft brake for wind power generation proposed in this utility model.

[0022] Figure 5 for Figure 2 Enlarged view of point A.

[0023] In the diagram: 1. Main spindle; 2. Housing; 3. Extension box; 4. Main braking mechanism; 5. Secondary braking mechanism; 6. Controller; 7. Motor; 401. Claw disc housing; 402. Small bevel gear; 403. Friction plate; 404. Gripper; 405. Base; 406. Claw disc body; 501. Connecting seat; 502. Bracket; 503. Spring hydraulic cylinder; 504. Electromagnet one; 505. Electromagnet two; 506. Fixture; 507. Temperature sensor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] A high-speed shaft brake for wind power generation, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the device includes a housing 2, a main shaft 1 rotatably connected to one side of the housing 2, a main braking mechanism 4 fixedly connected to the bottom of the inner wall of the housing 2, a secondary braking mechanism 5 provided inside the housing 2, and the main shaft 1 passing through the main braking mechanism 4 and the secondary braking mechanism 5. A controller 6 is fixedly connected to the inner wall of the housing 2, an expansion box 3 is fixedly connected to the bottom of the housing 2, a motor 7 is fixedly connected to the inner wall of the expansion box 3, and the output shaft of the motor 7 passes through the inner wall of the expansion box 3 and extends into the interior of the housing 2. The controller 6 is model LOGO8.

[0027] When it is necessary to brake the spindle 1, the motor 7 is started. At this time, the motor 7 drives the main braking mechanism 4 to clamp and brake the spindle 1. During this process, the auxiliary braking mechanism 5 continuously monitors the temperature of the contact area between the main braking mechanism 4 and the spindle 1, and transmits the temperature signal to the controller 6 in real time.

[0028] When the monitored temperature exceeds the preset threshold, the controller 6 sends a reverse command to the motor 7, driving the main braking mechanism 4 to return to its initial position, releasing the brake on the main shaft 1, and simultaneously activating the auxiliary braking mechanism 5, causing the auxiliary braking mechanism 5 to quickly clamp the main shaft 1. When the temperature drops back to a safe range, the controller 6 controls the auxiliary braking mechanism 5 to release the brake, and at the same time, the motor 7 rotates forward to reset, and the main braking mechanism 4 resumes its working state. This avoids the risk of failure caused by overheating in traditional single-path braking systems and significantly improves braking reliability.

[0029] In order to brake spindle 1, as follows Figure 3 and Figure 4 As shown, the main braking mechanism 4 includes a claw disc housing 401, small bevel gears 402, friction plates 403, grippers 404, a base 405, and a claw disc body 406. The base 405 is fixedly connected to the bottom of the inner wall of the housing 2, and the claw disc housing 401 is fixedly connected to the top of the base 405. Three small bevel gears 402 evenly penetrate the outer surface of the claw disc housing 401, and the small bevel gears 402 are rotatably connected to the claw disc housing 401. Three grippers 404 are slidably connected to one side of the claw disc housing 401. A rack is fixedly connected to one side of the gripper 404, and a friction plate 403 is fixedly connected to one side of the gripper 404. The gripper disc body 406 is rotatably connected to the inner wall of the gripper disc housing 401. A conical tooth is provided on one side of the gripper disc body 406, and a planar thread is provided on the other side of the gripper disc body 406. One side of the conical tooth of the gripper disc body 406 meshes with a small bevel gear 402, and the planar thread on the other side of the gripper disc body 406 meshes with the rack of the gripper 404. One of the small bevel gears 402 is fixedly connected to the output shaft of the motor 7.

[0030] When it is necessary to brake the spindle 1, the motor 7 starts and drives the small bevel gear 402 to rotate. At this time, the small bevel gear 402 drives the claw disc body 406 to make circular motion inside the claw disc housing 401.

[0031] During this process, the planar thread of the claw disc body 406 meshes with the rack of the jaw 404, converting the rotational motion of the claw disc body 406 into the linear motion of the jaw 404, which gradually approaches the center of the claw disc outer shell 401.

[0032] The gripper 404 drives the friction plate 403 to adhere to the surface of the spindle 1, and braking is achieved through friction. Since the three sets of grippers 404 are driven by the same planar thread, the radial force can be evenly distributed during braking. Thus, the helix angle design of the planar thread can produce a self-locking effect, ensuring that the clamping does not loosen after clamping, and the response speed is fast, meeting the requirements of rapid response for emergency braking.

[0033] To prevent overheating caused by continuous braking of the main braking mechanism 4, such as Figure 5As shown, the auxiliary braking mechanism 5 includes a connecting seat 501, a bracket 502, a spring hydraulic cylinder 503, an electromagnet 1 504, an electromagnet 2 505, a clamp 506, and a temperature sensor 507. The connecting seat 501 is fixedly connected to the inner wall of the housing 2. The two brackets 502 are respectively fixedly connected to both sides of the connecting seat 501. The bottom of the brackets 502 is fixedly connected to the electromagnet 1 504. The bottom of the connecting seat 501 is fixedly connected to the spring hydraulic cylinder 503. The extension end of the spring hydraulic cylinder 503 is fixedly connected to the clamp. 506. An electromagnet 2 505 is fixedly connected to the top of the clamp 506. The magnetic poles of the electromagnet 2 505 are opposite to those of the electromagnet 1 504. The connecting seat 501, the bracket 502, the spring hydraulic cylinder 503, the electromagnet 1 504, the electromagnet 2 505 and the clamp 506 form a symmetrical structure with the reference plane where the midpoint of the axis of the main shaft 1 is located as the mirror plane. The temperature sensor 507 is fixedly connected to the top of the connecting seat 501 near the bottom of the inner wall of the housing 2. The model of the temperature sensor 507 is PT100.

[0034] When the main braking mechanism 4 is braking, the temperature sensor 507 monitors the temperature of the contact area between the friction plate 403 of the main braking mechanism 4 and the main shaft 1 in real time. Once the detected value exceeds the preset threshold, the temperature signal is transmitted to the controller 6.

[0035] The controller 6 first controls the motor 7 to reverse, so that the gripper 404 moves away from the spindle 1. At the same time, the controller 6 controls the electromagnet 1 504 and electromagnet 2 505 to be de-energized. At this time, the electromagnet 1 504 and electromagnet 2 505 no longer attract each other. The extension end of the spring hydraulic cylinder 503 gradually extends and drives the clamp 506 to approach and contact the outer wall of the spindle 1.

[0036] Conversely, when the temperature sensor 507 detects that the temperature at the contact point between the main braking mechanism 4 and the main shaft 1 has dropped to a normal value, the controller 6 energizes the second electromagnet 505 and the first electromagnet 504. The second electromagnet 505 and the first electromagnet 504 attract each other, and at the same time drive the clamp 506 to squeeze the extension end of the spring hydraulic cylinder 503 away from the main shaft 1. Thus, the cyclic cooling effect of alternating heat dissipation of the main and auxiliary components is achieved, and the main shaft 1 is braked at the same time to reduce the wear of the friction plate 403 of the main braking mechanism 4, and at the same time to prevent the friction plate 403 from overheating and reducing the friction efficiency.

[0037] Working principle: When it is necessary to brake the spindle 1, the motor 7 is started. At this time, the motor 7 drives the main braking mechanism 4 to clamp and brake the spindle 1. During this process, the auxiliary braking mechanism 5 continuously monitors the temperature of the contact area between the main braking mechanism 4 and the spindle 1, and transmits the temperature signal to the controller 6 in real time.

[0038] When the monitored temperature exceeds a preset threshold, the controller 6 sends a reverse command to the motor 7, driving the main braking mechanism 4 to return to its initial position, releasing the brake on the spindle 1. Simultaneously, the auxiliary braking mechanism 5 is activated, causing it to quickly clamp the spindle 1. When the temperature drops back to a safe range, the controller 6 controls the auxiliary braking mechanism 5 to release the brake, and at the same time, the motor 7 rotates forward to reset, and the main braking mechanism 4 resumes its working state.

[0039] When it is necessary to brake the spindle 1, the motor 7 starts and drives the small bevel gear 402 to rotate. At this time, the small bevel gear 402 drives the claw disc body 406 to make circular motion inside the claw disc housing 401.

[0040] During this process, the planar thread of the claw disc body 406 meshes with the rack of the jaw 404, converting the rotational motion of the claw disc body 406 into the linear motion of the jaw 404, which gradually approaches the center of the claw disc outer shell 401.

[0041] The gripper 404 drives the friction plate 403 to adhere to the surface of the spindle 1, achieving braking through friction. Since the three sets of grippers 404 are driven by the same planar thread, it ensures that the radial force is evenly distributed during braking.

[0042] When the main braking mechanism 4 is braking, the temperature sensor 507 monitors the temperature of the contact area between the friction plate 403 of the main braking mechanism 4 and the main shaft 1 in real time. Once the detected value exceeds the preset threshold, the temperature signal is transmitted to the controller 6.

[0043] The controller 6 first controls the motor 7 to reverse, so that the gripper 404 moves away from the spindle 1. At the same time, the controller 6 controls the electromagnet 1 504 and electromagnet 2 505 to be de-energized. At this time, the electromagnet 1 504 and electromagnet 2 505 no longer attract each other. The extension end of the spring hydraulic cylinder 503 gradually extends and drives the clamp 506 to approach and contact the outer wall of the spindle 1.

[0044] Conversely, when the temperature sensor 507 detects that the temperature at the contact point between the main braking mechanism 4 and the main shaft 1 has dropped to a normal value, the controller 6 energizes the second electromagnet 505 and the first electromagnet 504. The second electromagnet 505 and the first electromagnet 504 attract each other, and at the same time drive the clamp 506 to compress the extension end of the spring hydraulic cylinder 503 away from the main shaft 1.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-speed shaft brake for wind power generation, comprising a housing (2), characterized in that, A main shaft (1) is rotatably connected to one side of the housing (2), a main braking mechanism (4) is fixedly connected to the bottom of the inner wall of the housing (2), a secondary braking mechanism (5) is provided inside the housing (2), and the main shaft (1) passes through the main braking mechanism (4) and the secondary braking mechanism (5). A controller (6) is fixedly connected to the inner wall of the housing (2); the main braking mechanism (4) includes a claw disc housing (401), a small bevel gear (402), a friction plate (403), a gripper (404), a base (405), and a claw disc body (406), and the base (405) is fixedly connected to the bottom of the inner wall of the housing (2); the claw disc housing (401) is fixedly connected to the top of the base (405). The three small bevel gears (402) are evenly penetrated through the outer surface of the claw disc housing (401), and the small bevel gears (402) are rotatably connected to the claw disc housing (401). The three jaws (404) are slidably connected to one side of the claw disc housing (401), and a rack is fixedly connected to one side of the jaws (404). A friction plate (403) is fixedly connected to one side of the jaws (404). The claw disc body (406) is rotatably connected to the inner wall of the claw disc housing (401). The claw disc body (406) has conical teeth on one side and a planar thread on the other side. One side of the conical teeth of the claw disc body (406) meshes with the small bevel gears (402). 06) The other side of the planar thread meshes with the rack of the gripper (404), and one of the small bevel gears (402) is fixedly connected to the output shaft of the motor (7); the auxiliary braking mechanism (5) includes a connecting seat (501), a bracket (502), a spring hydraulic cylinder (503), an electromagnet one (504), an electromagnet two (505), a clamp (506), and a temperature sensor (507), and the connecting seat (501) is fixedly connected to the inner wall of the housing (2), and the two brackets (502) are respectively fixedly connected to both sides of the connecting seat (501), and the bottom of the brackets (502) is respectively fixedly connected to the electromagnet one (504); the connecting seat (501) A spring hydraulic cylinder (503) is fixedly connected to the bottom. A clamp (506) is fixedly connected to the telescopic end of the spring hydraulic cylinder (503). An electromagnet (505) is fixedly connected to the top of the clamp (506). The magnetic poles of the electromagnet (505) are opposite to those of the electromagnet (504). The connecting seat (501), the bracket (502), the spring hydraulic cylinder (503), the electromagnet (504), the electromagnet (505), and the clamp (506) form a symmetrical structure with the reference plane where the midpoint of the axis of the main shaft (1) is located as the mirror plane. The temperature sensor (507) is fixedly connected to the top of the connecting seat (501) near the bottom of the inner wall of the housing (2).

2. A high-speed shaft brake for wind power generation according to claim 1, characterized in that, An expansion box (3) is fixedly connected to the bottom of the housing (2), and a motor (7) is fixedly connected to the inner wall of the expansion box (3). The output shaft of the motor (7) passes through the inner wall of the expansion box (3) and extends into the interior of the housing (2).

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