A large-scale high-speed wind turbine main transmission chain turning gear

Abstract

This invention discloses a turning device for the main drive chain of a large high-speed wind turbine, comprising: a drive unit connected to a turning unit, the turning unit connected to a gearbox, and the turning unit located between the gearbox and the drive unit; the drive unit is equipped with a coupling brake disc, and a gear ring is provided on the side end face of the coupling brake disc; the turning unit is equipped with an output pinion, which meshes with the gear ring; a linkage module is provided between the turning unit and the drive unit; it can be used for daily debugging, maintenance, and transportation of the drive chain, as well as daily maintenance and fault handling of the turbine unit, where the drive chain needs to be turned, to meet the lubrication requirements of the gearbox bearings and generator bearings; the gear ring is connected to the brake disc and the reduction mechanism is connected to the gearbox by bolts, making installation convenient; power is transmitted through gears, resulting in high torque density and high transmission efficiency, which can meet the high torque requirements of fault conditions; the gear ring and brake disc are positioned by locating pins to ensure the coaxiality of the gear ring and the coupling, ensuring high-precision transmission.

Description

Technical Field

[0001] This invention relates to the field of wind power generation equipment, and more particularly to a turning gear device for the main drive chain of a large high-speed wind turbine. Background Technology

[0002] In wind turbine generator sets, as the generator sets become larger, the rotor diameter also increases. To address the issue of rotor rotation and alignment when the rotor does not rotate under normal conditions or when blades malfunction, it is necessary to perform rotor rotation and lock the rotor for alignment. This reduces labor intensity, maintenance costs, and improves maintenance efficiency. Currently, with the development of larger generator sets, long-term storage after assembly of large wind turbine generator sets poses a risk of bearing failure due to insufficient lubrication in the main shaft bearings, gearbox bearings, and generator bearings. Simultaneously, vibrations during transmission can cause issues such as Brinell wear and fretting wear in generator bearings, gearbox bearings, and main bearings. To address these problems, the transmission chain needs to be rotated during transportation or after long-term storage, and oil-lubricated bearings require lubrication.

[0003] For example, a "turning device for a doubly fed wind turbine generator" disclosed in Chinese patent literature, with publication number CN 213655050 U, discloses the use of a chain as the power transmission process, and the brake disc must have chain teeth to realize power transmission. However, the power density of chain transmission is low, it requires a large space, and the motor must be designed with an independent installation space, which cannot meet the usage requirements during transportation or unit storage. Summary of the Invention

[0004] To address the issues of bearing and gear wear caused by insufficient lubrication during storage and transportation of generator drive chains in existing technologies, this invention provides a turning device for the main drive chain of large high-speed wind turbines, which can achieve turning through the cooperation of pinion and gear ring.

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

[0006] A turning gear device for the main drive chain of a large high-speed wind turbine includes: a drive unit connected to a turning gear unit, the turning gear unit connected to a gearbox, and the turning gear unit located between the gearbox and the drive unit; the drive unit is equipped with a coupling brake disc, and a gear ring is provided on the side end face of the coupling brake disc; the turning gear unit is equipped with an output pinion gear that meshes with the gear ring; and a linkage module is provided between the turning gear unit and the drive unit. The device enables the coupling brake disc to move through the engagement of the pinion gear and the gear ring, thereby achieving turning gear operation.

[0007] Preferably, the drive unit also includes a coupling connected to the gearbox and a coupling brake disc, and the coupling is connected to a first power unit. The first power unit includes a generator, which can transmit the power of the drive unit to the gearbox through the coupling. Rotating the coupling allows for simultaneous rotation of the drive unit and the gearbox, reducing stress concentration and wear.

[0008] Preferably, the coupling brake disc is also connected to a high-speed shaft brake, which is connected to the coupling brake disc and to the turning gear. Braking can be achieved through the high-speed shaft brake and the coupling brake disc.

[0009] Preferably, the turning gear also includes a second power unit, which is connected to the output pinion and to the gearbox via a mounting bracket. This second power unit can independently power the turning gear.

[0010] Preferably, the second power unit includes a motor connected to a reduction gear, which is connected to an output pinion. This reduces the motor's speed and outputs the reduced speed to the output pinion as turning power.

[0011] Preferably, the gear ring comprises two symmetrically arranged semi-gear rings, the total number of teeth on the gear ring is even, and the semi-gear rings are provided with multiple locating pin holes. This facilitates installation and disassembly, and the locating pin holes can be used for installation positioning.

[0012] Preferably, the mounting bracket and the second power unit are fixedly connected by bolts. The mounting bracket is an L-shaped bracket with an oblong hole. The second power unit is located in the oblong hole, allowing adjustment of the meshing clearance between the output pinion and the gear ring after installation.

[0013] Preferably, the mounting bracket is connected to a vibration damping mechanism, which is located between the mounting bracket and the motor, and between the mounting bracket and the gearbox. The vibration damping mechanism includes support legs, located below the motor and below the mounting bracket, with rubber baffles at the ends of the legs. This reduces vibration during operation.

[0014] Preferably, the motor is connected to a brake protection device, which includes a temperature-sensing resistor connected to a brake. The temperature-sensing resistor's temperature rises with increasing current. A temperature sensor is connected to the temperature-sensing resistor and then to the brake. The temperature sensor has a temperature threshold, which activates the brake when the detected temperature exceeds the threshold. This system can initiate braking by detecting temperature when the external load torque is too high and the motor cannot meet the output torque requirements, preventing reverse rotation. The motor also has control buttons for forward and reverse rotation.

[0015] Preferably, the linkage module includes a time relay connected to an electromagnet, which is connected to the turning gear unit. The driving unit is equipped with a permanent magnet corresponding to the electromagnet. The time relay is connected to the generator and is a normally open time-delay relay, used to disconnect after a delay upon receiving current. It can automatically adjust the position of the turning gear unit before each operation of the driving unit to perform turning.

[0016] The present invention has the following advantages:

[0017] It can be used for daily debugging, maintenance, transportation of transmission chains, and daily maintenance and fault handling of generator sets, etc., which require the transmission chain to be rotated. It meets the lubrication requirements of gearbox bearings and generator bearings. It has a wide range of applications, reduces the labor intensity of workers, improves work efficiency, and reduces maintenance costs. (2) The gear ring and brake disc and the reduction mechanism and gearbox are connected by bolts, which is convenient for installation. (3) Power is transmitted through gears, with high torque density and high transmission efficiency, which can meet the high torque requirements of fault conditions. (4) The gear ring and brake disc are positioned by positioning pins to ensure the coaxiality of the gear ring and the coupling, and ensure high-precision transmission. (5) The position of the rotating part can be automatically adjusted before operation by the linkage module, which has a high degree of automation. (6) The rotating part motor can be protected by the brake protection device through current detection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the main drive chain turning device for large wind turbines in this invention.

[0020] Figure 2 This is a schematic diagram of the connection structure between the gear ring and the coupling brake disc in this invention.

[0021] Figure 3 This is a schematic diagram of the positioning structure of the gear ring and the coupling brake disc in this invention.

[0022] Figure 4 This is a schematic diagram of the structure of the half-tooth ring in this invention.

[0023] In the picture:

[0024] 1-Generator; 2-Coupling; 3-Coupling brake disc; 4-Gear ring; 5-Output pinion; 6-Reduction mechanism; 7-Motor; 8-Mounting bracket; 9-Mounting bolt; 11-Gearbox; 12-Connecting bolt; 14-High-speed shaft brake; 15-Positioning pin; 41-Half gear ring; 42-Positioning pin hole; 43-Small threaded hole; 44-Large threaded hole. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Obviously, the described embodiments are only a part of, and not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] like Figure 1-4 As shown in a preferred embodiment, the present invention discloses a turning gear device for the main drive chain of a large wind turbine, comprising: a drive unit, a turning gear unit connected to the drive unit, a gearbox 11 connected to the drive unit, and the turning gear unit located between the gearbox 11 and the drive unit; the drive unit is provided with a coupling brake disc 3, and a gear ring 4 is provided on the side end face of the coupling brake disc 3; the turning gear unit is provided with an output pinion 5, which meshes with the gear ring 4; a linkage module is provided between the turning gear unit and the drive unit. The device can drive the coupling brake disc to move through the cooperation of the pinion and the gear ring, thereby achieving turning gear operation.

[0027] The drive unit also includes a coupling 2, which is connected to the gearbox 11 and a coupling brake disc 3. A first power unit is also connected to the coupling 2. The first power unit includes a generator 1. It transmits power from the drive unit to the gearbox 11 via the coupling 2. Both ends of the coupling 2 are connected to the first power unit and the gearbox 11, respectively. During operation, the coupling 2 transmits power from the first power unit to the gearbox 11, thereby driving the components inside the gearbox 11 to rotate within the coupling. This allows for simultaneous rotation of both the drive unit and the gearbox, reducing stress concentration and wear.

[0028] The coupling brake disc 3 is also connected to a high-speed shaft brake 14, which is connected to the coupling brake disc 3 and the turning gear unit. The gear ring is connected to the right end face of the coupling brake disc 3 via connecting bolts 12, with a shim between the connecting bolts 12 and the coupling brake disc 3. Braking can be achieved through the high-speed shaft brake and the coupling brake disc.

[0029] The turning gear also includes a second power unit, which is connected to the output pinion 5 and to the gearbox 11 via a mounting bracket 8. The mounting bracket 8 is an L-shaped bracket with an oblong hole. It is fixed to the upper surface of the gearbox 11 housing by mounting bolts 9. The turning gear can be powered independently by the second power unit. The second power unit, located in the oblong hole, allows adjustment of the meshing clearance between the output pinion and the gear ring after installation.

[0030] The second power unit includes a motor 7, which is connected to a reduction mechanism 6. The reduction mechanism 6 is connected to an output pinion 5. The reduction mechanism 6 can reduce the output of the motor 7 and transmit it to the pinion, which in turn drives the gear ring 4 to achieve rotary rotation.

[0031] The gear ring 4 includes two symmetrically arranged semi-gear rings 41. The total number of teeth in the gear ring 4 is even. Each semi-gear ring 41 has multiple locating pin holes 42 for easy installation and disassembly. The locating pin holes 42 are used for installation positioning. To achieve high torque transmission, each semi-gear ring 41 is designed with multiple arrayed large threaded holes 44 for connection between the semi-gear ring 41 and the brake disc. To ensure the required installation accuracy of the semi-gear rings 41, each semi-gear ring 41 has two locating pin holes 42. Locating pins 15 ensure the semi-gear ring 41 is positioned on the brake disc. For easy disassembly after installation, each semi-gear ring 41 has one small threaded hole 43. The split surface of the semi-gear ring 41 must be located at the lowest point of the gear tooth root arc. This facilitates installation and disassembly, and the locating pin holes are used for installation positioning.

[0032] The mounting bracket is equipped with a vibration damping mechanism, located between the mounting bracket and the motor, and between the mounting bracket and the gearbox. The vibration damping mechanism includes support legs, located below the motor and below the mounting bracket, with rubber baffles at the ends of the legs. This reduces vibration during operation. In use, the rubber baffles effectively prevent the transmission of vibration from the motor and reduction gear.

[0033] The motor is equipped with a brake protection device, which includes a temperature-sensing resistor connected to a brake. The temperature-sensing resistor's temperature rises with increasing current. It is connected to a temperature sensor, which in turn is connected to the brake. The temperature sensor has a temperature threshold, and it activates the brake when the detected temperature exceeds the threshold. This system can initiate braking by detecting temperature when the external load torque is too high and the motor cannot meet the output torque requirements, preventing reverse rotation. The motor has control buttons for forward and reverse rotation. During operation, an increase in current causes the temperature of the temperature-sensing resistor to rise. This temperature rise causes the temperature sensor to detect a value exceeding the threshold, triggering an over-temperature signal to the brake, which then brakes the motor.

[0034] The linkage module includes a time relay connected to an electromagnet, which is connected to the turning gear unit. The drive unit has a permanent magnet corresponding to the electromagnet. The time relay is connected to the generator and is a normally open time-delay relay, used to delay disconnecting after receiving current. It can automatically adjust the position of the turning gear unit before each operation of the drive unit, thus performing turning. In use, when the time relay is energized, it closes. The electromagnet, energized, generates magnetism, which repels the permanent magnet, causing it to move. The electromagnet drives the turning gear unit towards the drive unit, allowing the output pinion to mesh with the gear ring. When the time relay disconnects after a set time, the electromagnet loses power and no longer generates magnetism. The electromagnet is then influenced by the magnetic force of the permanent magnet and moves towards the permanent magnet, thus causing the output pinion of the turning gear unit to separate from the gear ring.

[0035] In the second embodiment, the reduction mechanism is a bevel gear + multi-stage planetary gear reduction. The small bevel gear is directly connected to the motor shaft through a spline, the large bevel gear is connected to the first-stage sun gear through a spline, the first-stage output planetary carrier is connected to the first-stage sun gear, and the second-stage planetary carrier is connected to the output pinion shaft through a spline to achieve speed reduction and torque increase. The above structure ultimately realizes power transmission between vertical shafts and reduces installation space.

[0036] In the third embodiment, to facilitate gear installation and disassembly, the coupling brake disc 3 has 24 mounting through holes that are evenly distributed, and 4 pin mounting holes that are equally spaced to ensure accurate installation and positioning of the half gear ring.

[0037] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A turning gear device for the main drive chain of a large high-speed wind turbine, characterized in that, include: The unit includes an active section connected to a turning section, which in turn is connected to a gearbox. The turning section is located between the gearbox and the active section. The active section is equipped with a coupling brake disc, on the side end face of which a gear ring is mounted. The turning section is equipped with an output pinion gear that meshes with the gear ring. A linkage module is provided between the turning section and the active section. The gear ring includes two symmetrically arranged half gear rings, each half gear ring having multiple locating pin holes and multiple large threaded holes arranged in an array; The linkage module includes a time relay, which is connected to an electromagnet. The electromagnet is connected to the turning gear, and the driving part is equipped with a permanent magnet corresponding to the electromagnet.

2. The large high-speed wind turbine main drive chain turning device according to claim 1, characterized in that, The active unit also includes a coupling, which is connected to the gearbox, the coupling is connected to the coupling brake disc, and the coupling is connected to the first power unit.

3. The main drive chain turning device for a large high-speed wind turbine as described in claim 2, characterized in that, The coupling brake disc is also connected to a high-speed shaft brake, which is connected to the coupling brake disc and to the turning gear.

4. A large high-speed wind turbine main drive chain turning device according to claim 2 or 3, characterized in that, The turning section also includes a second power unit, which is connected to the output pinion and the gearbox via a mounting bracket.

5. A large-scale high-speed wind turbine main drive chain turning device according to claim 4, characterized in that, The second power unit includes a motor, which is connected to a reduction gear, and the reduction gear is connected to an output pinion.

6. A large high-speed wind turbine main drive chain turning device according to claim 4, characterized in that, The gear ring includes two symmetrically arranged semi-gear rings. The total number of teeth in the gear ring is even, and the semi-gear rings are provided with multiple locating pin holes.

7. The large high-speed wind turbine main drive chain turning device according to claim 4, characterized in that, The mounting bracket is fixedly connected to the second power unit by bolts. The mounting bracket is an L-shaped bracket with a waist-shaped hole.

8. A large-scale high-speed wind turbine main drive chain turning device according to claim 7, characterized in that, The mounting bracket is connected to a shock-absorbing mechanism, which is located between the mounting bracket and the motor, and between the mounting bracket and the gearbox.

9. A large-scale high-speed wind turbine main drive chain turning device according to claim 7, characterized in that, The motor is connected to a brake protection device, which includes a temperature sensing resistor and is connected to a brake.

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