Shafting driving device for semi-direct-drive wind turbine generator

Abstract

The utility model discloses a kind of shafting driving devices for half direct drive wind turbine, belong to wind power generation technical field.The device mainly includes adapter disk assembly, driving disc assembly, slewing bearing, counterforce arm assembly and the driving system of servo motor drive.The core is: adapter disk assembly is made into coaxial preassembly combination by multiple different sizes modular adapter disk, by disassembling outside adapter disk to adapt different generator interface, realize a set of device multi-model general;Counterforce arm assembly is realized by slidable rocker shaft and rotatable rocker multiple degree-of-freedom adjustment, it is convenient to be connected with generator stator end cover fast centering;Driving system uses the innovative structure of installing self-aligning roller bearing to gear end, effectively solve the technical problem that cantilever gear pair is not uniform after meshing under load.The present application has the advantages of strong universality, convenient installation, high reliability and low maintenance cost, significantly improves the efficiency and economic benefits of wind turbine shafting driving operation.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine equipment technology, specifically to a shaft drive device for a semi-direct drive wind turbine. Background Technology

[0002] With the rapid development of the wind power industry, the single-unit capacity of wind turbines is constantly increasing, and their internal structure is becoming increasingly complex. In the manufacturing, installation, and maintenance of semi-direct-drive wind turbines, it is often necessary to drive the generator shaft system to perform operations such as turning and alignment. However, the current market faces two major technical challenges: First, there is the problem of poor equipment versatility and high cost. Different projects and different models of wind turbines have different flange interface specifications for generator rotor supports and different required drive torques. Therefore, companies usually need to customize dedicated shaft drive devices for each model. This "one machine, one device" model results in extremely low equipment reuse rate, serious idle waste, and brings huge procurement and storage cost pressures to wind farm operators and construction units.

[0003] Secondly, there are inherent technical defects and installation difficulties in existing drive systems. Conventional shaft drive systems often employ cantilever gear transmissions. The pinion gear on the output shaft of the right-angle reducer undergoes deflection deformation under high torque, leading to uneven loading and poor tooth contact with the external teeth of the slewing bearing. Over long-term use, this can easily cause tooth breakage or internal damage to the reducer, resulting in insufficient reliability. Furthermore, the reaction support structure of traditional devices is often a rigid design, requiring simultaneous alignment of multiple connection points during installation. This centering adjustment is extremely difficult, time-consuming, and labor-intensive, significantly impacting on-site construction efficiency.

[0004] Therefore, there is an urgent need in this field for a new type of shaft drive device for semi-direct drive wind turbines that is versatile, easy to install, and reliable in transmission, in order to solve the aforementioned long-standing technical bottlenecks and economic efficiency issues. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a shaft drive device for a semi-direct drive wind turbine.

[0006] The technical solution adopted in this utility model is as follows: A shaft drive device for a semi-direct drive wind turbine includes: The adapter plate assembly consists of multiple modular adapter plates of different structural dimensions forming a coaxial pre-assembled assembly. The adapter plates are arranged in order of increasing radial dimension and assembled through detachable connectors. The inner adapter plate with the smallest radial dimension is used to connect to the rotor support interface of the generator, while the inner adapter plate with the largest radial dimension is used to connect to the drive plate assembly. The drive plate assembly is centered on the innermost adapter plate in the adapter plate assembly via a stop, and is connected to the adapter plate via multiple circumferentially distributed quick-release anti-shear pins to transmit torque. The slewing bearing has its outer gear ring fixedly connected to the drive disc assembly; The drive system includes a servo motor and a right-angle planetary reducer driven by the servo motor; The pinion is connected to the output shaft of the right-angle planetary reducer via its internal spline and meshes with the external teeth of the slewing bearing. Self-aligning roller bearings are mounted on a hollow shaft at the end of the pinion to provide auxiliary support for the pinion. The reaction arm assembly is used to connect to the generator stator end cover and provide reaction force support for the entire device.

[0007] Furthermore, when it is necessary to adapt to generators with different interface specifications, one or more outer adapter plates with larger radial dimensions are removed to expose adapter plates with matching radial dimensions, which then serve as new outermost adapter plates to interface with the drive plate assembly.

[0008] Furthermore, the reaction arm assembly includes: The reaction arm housing is equipped with a waist-shaped sliding groove; The rocker arm shaft can slide up and down along the waist-shaped slide groove; The rocker arm can rotate around its axis and slide back and forth along that axis. The reaction pin is mounted on the rocker arm and is used to connect to the interface on the generator stator end cover.

[0009] Furthermore, the drive system includes a drive unit consisting of four servo motors and right-angle planetary reducers. Each of the four right-angle planetary reducers has a pinion on its output shaft, which together drive the slewing bearing.

[0010] Furthermore, the self-aligning roller bearing provides support to restrain the pinion's runout under load, ensuring uniform meshing between it and the external teeth of the slewing bearing.

[0011] Furthermore, the connection interfaces between the adapters in the adapter assembly are provided with mutually cooperating positioning stops.

[0012] Furthermore, the adapter plate assembly, drive plate assembly, and reaction arm assembly together form a modular adjustable structure, enabling the shaft drive device to quickly adapt to semi-direct drive wind turbine units with various interface specifications by selecting the outermost adapter plate in the adapter plate assembly.

[0013] Furthermore, the pinion is designed as a stepped shaft structure, with an internal spline at the large end and a self-aligning roller bearing installed at the small end, with the outer ring of the bearing fixed to the extended end cover of the reducer housing.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: Extremely high versatility and compatibility, significantly reducing costs: Through the innovative "coaxial pre-assembled assembly" adapter design, multiple adapters of different specifications are pre-integrated into a single unit. In practical applications, the specifications matching the target generator interface can be quickly exposed simply by disassembling the outer adapter. This modular concept of "one set for multiple units" completely changes the traditional "one unit for one adapter" customization model, enabling a single unit to cover the interface requirements of most onshore semi-direct drive units, greatly reducing the number and types of shaft drive units that wind farms need to purchase, saving up to 70% or more in equipment procurement and storage costs.

[0015] Revolutionary improvements in installation convenience and a doubling of construction efficiency: This device adopts a "step-by-step" installation strategy. First, the connections between the adapter plate and the generator rotor, and between the drive plate and the adapter plate, all utilize stop-gauge positioning and quick-connect pins, achieving rapid and precise docking of the main structure. Second, the reaction arm assembly is installed independently, and its multi-degree-of-freedom adjustment mechanism (rocker arm shaft sliding up and down, rocker arm sliding forward and backward, and rotation around the shaft) effectively compensates for dimensional deviations in the installation interface, allowing the reaction pin to easily align with the connection holes of different distribution circles on the generator stator end cover. This design simplifies the traditional, multi-person, and difficult-to-align overall docking operation into a standardized process that can be completed by a single person in steps, significantly reducing construction difficulty and labor costs.

[0016] Fundamentally improved drive reliability and extended maintenance cycle: Addressing the industry pain points of uneven meshing and easy tooth breakage in traditional cantilever gear pairs under load, this application innovatively introduces a self-aligning roller bearing at the pinion end. This bearing can automatically compensate for pinion runout caused by stress deformation and installation errors, ensuring uniform contact between the pinion and the external teeth of the slewing bearing across the entire tooth width. This effectively reduces tooth root bending stress and tooth surface contact stress, fundamentally eliminating tooth breakage, extending the service life of the transmission system, and significantly reducing the downtime and maintenance risks and costs caused by reducer damage.

[0017] Precise and flexible drive control, stable torque output: A scheme employing four sets of servo motors and right-angle planetary reducers in parallel drive allows for precise and synchronized control of the output torque and speed of each motor through the control system. This design not only provides redundancy backup (allowing for derated operation even in the event of a single motor failure), but also reduces the load on a single drive train through torque splitting, making the entire drive process smoother and more controllable. It can accurately meet the differentiated requirements of different models for drive torque and speed under various operating conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the output side of the shaft drive device of this utility model; Figure 2 This is a schematic diagram of the drive side of the shaft drive device of this utility model; Figure 3 This is a detailed drawing of the reaction arm structure of this utility model; Figure 4 This is a side view of the reaction arm structure of this utility model; Figure 5 This is a schematic diagram of the adapter plate and drive plate of this utility model in action; Figure 6 This is a cross-sectional view of the servo motor and right-angle reducer installation of this utility model; Figure 7 This is a topology diagram of the torque transmission of the shaft drive device of this utility model.

[0019] Marked in the image: 1-Adapter plate; 2-Drive plate; 3-Slewing bearing; 4-Servo motor; 5-Reducer; 6-Pin gear; 7-Roller bearing; 8-Reaction arm housing; 9-Slide groove; 10-Rocker arm shaft; 11-Rocker arm; 12-Reaction pin shaft; 13-End cover. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0022] Example 1 In this embodiment, as shown in the figure, a shaft drive device for a semi-direct drive wind turbine includes: The adapter plate assembly consists of multiple modular adapter plates of different structural dimensions forming a coaxial pre-assembled assembly. The adapter plates are arranged in order of increasing radial dimension and assembled through detachable connectors. The inner adapter plate with the smallest radial dimension is used to connect to the rotor support interface of the generator, while the inner adapter plate with the largest radial dimension is used to connect to the drive plate assembly. The drive plate assembly is centered on the innermost adapter plate in the adapter plate assembly via a stop, and is connected to the adapter plate via multiple circumferentially distributed quick-release anti-shear pins to transmit torque. The slewing bearing has its outer gear ring fixedly connected to the drive disc assembly; The drive system includes a servo motor and a right-angle planetary reducer driven by the servo motor; The pinion is connected to the output shaft of the right-angle planetary reducer via its internal spline and meshes with the external teeth of the slewing bearing. Self-aligning roller bearings are mounted on a hollow shaft at the end of the pinion to provide auxiliary support for the pinion. The reaction arm assembly is used to connect to the generator stator end cover and provide reaction force support for the entire device.

[0023] Specifically: The adapter plate assembly consists of three steel adapter plates of different diameters pre-assembled coaxially, connected into a single unit by eight sets of circumferentially distributed high-strength bolts. The drive plate assembly is positioned with the outermost adapter plate via a precision-machined stop and connected by six shear pins. The slewing bearing external gear ring is bolted to the drive plate via a flange. Four servo motors (7.5kW) and a right-angle planetary reducer (1:10 ratio) are evenly distributed around the drive plate. The pinion is connected to the reducer output shaft via an internal spline, and a self-aligning roller bearing is mounted on its hollow end shaft. The reaction arm assembly is connected to the drive plate housing via a welded base.

[0024] The adapter plate assembly adopts a "cake-like" layered structure, with the largest plate connected to the generator rotor and the smallest plate connected to the drive plate. The drive system transmits torque through the meshing of the pinion and slewing bearing, and the reaction arm assembly forms a torque balance system.

[0025] During operation, the servo motor drives the reducer, which in turn drives the slewing bearing to rotate via the pinion, thereby driving the transfer plate assembly and the generator rotor to rotate. The self-aligning roller bearing automatically compensates for the deflection deformation of the pinion, and the reaction arm assembly transmits the reaction torque to the generator stator.

[0026] Beneficial effects: The pre-assembled adapter panel enables "one device to adapt to multiple interface specifications", greatly reducing on-site replacement time; the introduction of self-aligning roller bearings solves the problem of uneven load on cantilever gears and extends gear life.

[0027] Furthermore, when it is necessary to adapt to generators with different interface specifications, one or more outer adapter plates with larger radial dimensions are removed to expose adapter plates with matching radial dimensions, which then serve as new outermost adapter plates to interface with the drive plate assembly.

[0028] The adapter plate assembly adopts a graded positioning design, with clear specification markings on the outer edge of each adapter plate, and the connecting bolts are all 12.9 grade high-strength bolts of the same specification.

[0029] The outer adapter plate is connected to the inner adapter plate by bolts, forming a stacked structure that can be disassembled step by step.

[0030] The adapter plate has two flanges of different sizes. The larger outer flange is used to connect to the generator stator, and the smaller outer flange is used to connect to the smaller inner adapter plate.

[0031] Beneficial effects: This design reduces interface conversion time from the traditional 2-3 hours to 20 minutes, and eliminates the need for hoisting equipment, significantly improving on-site work efficiency.

[0032] Furthermore, the reaction arm assembly includes: The reaction arm housing is equipped with a waist-shaped sliding groove; The rocker arm shaft can slide up and down along the waist-shaped slide groove; The rocker arm can rotate around its axis and slide back and forth along that axis. The reaction pin is mounted on the rocker arm and is used to connect to the interface on the generator stator end cover.

[0033] The reaction arm housing is made of cast iron. The rocker arm shaft passes through the waist-shaped sliding groove and is fixed by the lock nut. The rocker arm is sleeved on the rocker arm shaft, and the reaction pin is installed at the end of the rocker arm through a tapered roller bearing.

[0034] Working principle: During installation, first loosen the locking nut, then adjust the position of the rocker arm shaft in the slide groove to achieve up and down adjustment; the rocker arm can rotate ±30° around the shaft to achieve three-dimensional spatial position adjustment.

[0035] Beneficial effects: This multi-degree-of-freedom adjustment mechanism can compensate for installation deviations, enabling the reaction pin to be accurately aligned with the generator stator connection hole, thus solving the problem of difficult alignment in traditional rigid connections.

[0036] Furthermore, the drive system includes a drive unit consisting of four servo motors and right-angle planetary reducers. Each of the four right-angle planetary reducers has a pinion on its output shaft, which together drive the slewing bearing.

[0037] Four drive units are evenly distributed at the four corners of the device. Each unit contains one permanent magnet synchronous servo motor and one right-angle planetary reducer, which are connected by diaphragm couplings.

[0038] Each reducer output shaft is fitted with a pinion gear via an interference fit, and all four pinions mesh with the external gear ring of the slewing bearing simultaneously.

[0039] The control system synchronously controls four servo motors and intelligently distributes the output torque of each motor according to torque requirements.

[0040] The parallel drive of multiple motors achieves torque diversion, and can still operate at reduced capacity when a single motor fails; compared with the single motor drive scheme, the gear meshing force is reduced, which significantly improves the reliability of the transmission system.

[0041] Furthermore, the self-aligning roller bearing provides support to restrain the pinion's runout under load, ensuring uniform meshing between it and the external teeth of the slewing bearing.

[0042] The pinion is designed with a stepped shaft structure, with an internal spline at the large end and a self-aligning roller bearing installed at the small end. The outer ring of the bearing is fixed to the extended end cover of the reducer housing.

[0043] The inner ring of the self-aligning roller bearing has an interference fit with the pinion, while the outer ring has a clearance fit with the end cover.

[0044] When the gear pair is under load and generates bending moment, the self-aligning roller bearing provides additional support through the end cover to prevent deformation.

[0045] Furthermore, the connection interfaces between the adapters in the adapter assembly are provided with mutually cooperating positioning stops.

[0046] The positioning stop should be aligned first during the assembly of the adapter plate to ensure concentricity before tightening the connecting bolts.

[0047] The stop fit forms a radial positioning reference, and the bolts only bear axial tensile stress, avoiding shear loads. This ensures the alignment accuracy between the drive disc and the generator rotor, and reduces vibration and noise.

[0048] Furthermore, the adapter plate assembly, drive plate assembly, and reaction arm assembly together form a modular adjustable structure, enabling the shaft drive device to quickly adapt to semi-direct drive wind turbine units with various interface specifications by selecting the outermost adapter plate in the adapter plate assembly.

[0049] The entire device adopts the design concept of "basic platform + adapter module". The adapter plate assembly provides radial interface adaptation, the reaction arm assembly provides spatial position adaptation, and the drive plate assembly serves as a torque transmission platform.

[0050] The three main modules are connected through standardized interfaces. The electrical system uses quick-connect fittings, and the mechanical system uses a combination of locating pins and anti-shear pins.

[0051] Depending on the requirements of different models, the exposed layer of the adapter plate assembly can be quickly replaced and the spatial posture of the reaction arm adjusted to complete the adaptation and modification.

[0052] This allows a single unit to cover the needs of various machine models, improving equipment utilization and significantly reducing equipment procurement and maintenance costs.

[0053] Example 2 The specific workflow is as follows: Transport the pre-assembled adapter plate assembly, drive plate main structure, reaction arm assembly, etc., to the wind turbine generator. Check the integrity of each component and confirm that the connecting bolts, pins, tools, etc. are complete.

[0054] Most preparations are completed on the ground beforehand, avoiding high-altitude work and improving safety and efficiency. This reduces on-site installation time and lowers the risks associated with working at heights.

[0055] Measure the diameter of the distribution circle of the connection holes on the generator rotor bracket flange. Observe the specification markings on the adapter plate assembly to determine the adapter plate that needs to be exposed.

[0056] Using a hydraulic torque wrench, remove the high-strength bolts connecting the Φ1800mm adapter plate in a diagonal sequence. Lift the plate away to fully expose the target adapter plate as the new connection interface. This reduces interface conversion time from several hours, significantly improving adaptation efficiency.

[0057] Align the adapted adapter plate assembly with the generator rotor flange using the stop position, and pre-tighten and finally tighten it using special fasteners according to the predetermined torque and sequence.

[0058] Hoist the drive plate assembly, allowing its stop to slowly and smoothly embed into the stop of the installed adapter plate. After confirming it is fully in place, insert the multiple circumferentially distributed quick-release shear pins and tighten the mechanical locking pins.

[0059] It achieves a fast, precise, and rigid connection between the drive plate and the adapter plate, resulting in high construction efficiency.

[0060] Loosen the locking nut on the rocker arm shaft of the reaction arm housing.

[0061] The rocker arm shaft moves up and down, moves back and forth, and rotates the rocker arm to initially align the four reaction pins with the four connection holes on the generator stator end cover.

[0062] A laser alignment instrument is used for fine-tuning to ensure the concentricity of each pin and hole.

[0063] Insert the reaction pin into the hole, install the locking washer and nut, and tighten.

[0064] Connect the power cables and feedback cables of the four servo motors to the control cabinet. Turn on the power and set the required torque and speed parameters in the control system. Perform a jog test to check the meshing of the pinion with the external teeth of the slewing bearing and whether the entire device operates smoothly and without abnormal noise.

[0065] The drive system is started. The control system sends signals to the four servo motors according to the instructions. The motors output torque and speed, which are amplified and reduced in one step by a right-angle planetary reducer. The reducer output shaft drives the pinion to rotate, and the pinion drives the external gear ring of the slewing bearing for a second torque amplification and speed reduction. The torque is finally transmitted to the generator rotor through the drive plate and the adapter plate, causing it to rotate slowly for turning and centering operations.

[0066] During operation, the control system monitors the current, temperature, and feedback position of each servo motor in real time to ensure synchronized operation and balanced torque across the four motors. Operators listen to operating noise and observe for any abnormal vibrations. This ensures the stability and safety of the drive process, allowing for immediate shutdown in case of any abnormalities.

[0067] After the drive task is completed, shut down the machine in sequence. First, disassemble the reaction pin of the reaction arm assembly, then pull out the shear pin between the drive plate and the adapter plate, and lift the drive plate body. Finally, remove the connecting bolts between the adapter plate and the generator. After cleaning all modules, they can be reassembled into a "pre-assembled assembly" state for easy transportation and future use.

[0068] The disassembly efficiency is high, the parts are easy to manage, maintain and reuse, and the overall utilization rate is greatly improved.

[0069] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included within the protection scope of the utility model.

Claims

1. A shaft drive device for a semi-direct drive wind turbine generator set, characterized in that, include: The adapter plate assembly consists of multiple modular adapter plates of different structural dimensions forming a coaxial pre-assembled assembly. The adapter plates are arranged in order of increasing radial dimension and assembled through detachable connectors. The inner adapter plate with the smallest radial dimension is used to connect to the rotor support interface of the generator, while the inner adapter plate with the largest radial dimension is used to connect to the drive plate assembly. The drive plate assembly is centered on the innermost adapter plate in the adapter plate assembly via a stop, and is connected to the adapter plate via a plurality of circumferentially distributed quick-release anti-shear pins to transmit torque. A slewing bearing, the outer gear ring of which is fixedly connected to the drive disk assembly; The drive system includes a servo motor and a right-angle planetary reducer driven by the servo motor; The pinion is connected to the output shaft of the right-angle planetary reducer via its internal spline and meshes with the external teeth of the slewing bearing. A self-aligning roller bearing is mounted on a hollow shaft at the end of the pinion to provide auxiliary support for the pinion. The reaction arm assembly is used to connect to the generator stator end cover and provide reaction force support for the entire device.

2. The shaft drive device according to claim 1, characterized in that, When it is necessary to adapt to generators with different interface specifications, one or more outer adapter plates with larger radial dimensions are removed to expose an adapter plate with a matching radial dimension, which then serves as the new outermost adapter plate to interface with the drive plate assembly.

3. The shaft drive device according to claim 1, characterized in that, The reaction arm assembly includes: The reaction arm housing is equipped with a waist-shaped sliding groove; The rocker arm shaft can slide up and down along the waist-shaped groove; The rocker arm is rotatable about the rocker arm axis and can slide back and forth along the rocker arm axis. The reaction pin is mounted on the rocker arm and is used to connect to the interface on the generator stator end cover.

4. The shaft drive device according to claim 1, characterized in that, The drive system includes a drive unit consisting of four servo motors and right-angle planetary reducers. Each of the four right-angle planetary reducers has a pinion gear on its output shaft, which together drives the slewing bearing.

5. The shaft drive device according to claim 1, characterized in that, The self-aligning roller bearing provides support to constrain the sway of the pinion under load, ensuring uniform meshing between it and the outer teeth of the slewing bearing.

6. The shaft drive device according to claim 1, characterized in that, The connection interfaces between the adapters in the adapter assembly are provided with mutually cooperating positioning stops.

7. The shaft drive device according to any one of claims 1 to 6, characterized in that, The adapter plate assembly, drive plate assembly, and reaction arm assembly together form a modular adjustable structure, enabling the shaft drive device to quickly adapt to semi-direct drive wind turbines with various interface specifications by selecting the outermost adapter plate in the adapter plate assembly.

8. The shaft drive device according to claim 1, characterized in that, The pinion is designed as a stepped shaft structure, with an internal spline at the large end and a self-aligning roller bearing installed at the small end. The outer ring of the bearing is fixed to the extended end cover of the reducer housing.

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