A main shaft speed change system for a wind power generation simulation device

Abstract

The utility model discloses a kind of main shaft speed change system for wind power generation simulation device, it is related to practical training equipment technical field, the system includes reduction motor, motor chain wheel, main shaft, bearing with seat, electric slip ring, main shaft chain wheel, parallel shaft gearbox, centering disc, coupling, generator and encoder, wherein, the output shaft of reduction motor is connected with motor chain wheel, and motor chain wheel is connected by chain drive with main shaft chain wheel that is sleeved on main shaft;Bearing with seat is sleeved on main shaft and supports it, and electric slip ring is also sleeved on main shaft;The input shaft of parallel shaft gearbox is hollow shaft, and main shaft end is arranged in the hollow shaft and is fixed by locking structure;The output shaft of parallel shaft gearbox is connected with the input shaft of generator through centering disc, coupling;Encoder is arranged at the output end of generator, and the system can simulate the movement of relevant components in wind power generation, realize power generation simulation function, and provide effective simulation device support for wind power generation related research etc..

Description

Technical Field

[0001] This utility model relates to the field of training equipment technology, specifically to a main shaft speed change system for a wind power generation simulation device. Background Technology

[0002] In the research and teaching of wind power generation technology, directly relying on actual wind farms for related experiments, tests, and teaching activities presents numerous limitations. The operation of wind turbines in actual wind farms is greatly affected by environmental factors such as natural wind speed and direction, making it difficult to conduct targeted experiments under set stable wind speed conditions. Furthermore, actual wind turbine generators are large and complex in structure, and their operation involves high voltage and high speed conditions, hindering close-range structural observation, parameter measurement, and teaching demonstrations. Therefore, a dedicated wind power generation simulation device is needed to simulate the core processes of wind turbine rotation, main shaft operation, and power generation, providing a controllable, safe, and convenient experimental platform for wind power generation-related technical research, performance testing, and teaching training.

[0003] As a core component of wind power generation simulation devices, the main shaft transmission system directly affects the operational stability and simulation accuracy of the device. Existing main shaft transmission systems in simulation devices often suffer from problems such as unreasonable structural design, low transmission efficiency, and insufficient speed regulation precision. In some systems, the connection between the main shaft and the gearbox is unreliable, prone to loosening or concentricity deviations, leading to significant vibration and noise during operation and affecting simulation results. Other systems have complex transmission structures, making installation and adjustment difficult and hindering the guarantee of precise fit between components, thus affecting the stability of speed transmission. This makes it impossible to accurately simulate the motion of the wind turbine and main shaft at different wind speeds, and also makes it difficult to reliably drive the generator to achieve stable power generation simulation.

[0004] Furthermore, existing systems have shortcomings in speed detection and control, making it difficult to accurately detect generator speed and automatically adjust according to set parameters, thus failing to meet the precise control requirements of simulation devices for operating parameters. Therefore, developing a system with a reasonable structure, stable transmission, convenient installation and adjustment, and the ability to accurately simulate the speed change process of wind turbine main shaft has become crucial for improving the performance of wind power generation simulation devices. Utility Model Content

[0005] The purpose of this invention is to provide a main shaft transmission system for a wind power generation simulation device, addressing issues such as unreasonable structural design, poor transmission stability, inconvenient installation and adjustment, and insufficient speed detection accuracy in existing wind power generation simulation devices. Specifically, by setting up a chain drive structure consisting of a geared motor, a motor sprocket, and a main shaft sprocket, power can be stably transmitted, simulating the process of a wind turbine driving the main shaft to rotate, ensuring the reliability of power transmission. A bearing with a mounting plate provides stable support for the main shaft. Combined with the design of a hollow shaft input shaft for the parallel shaft gearbox, which is fixed to the main shaft via a locking structure, the stability of the connection between the main shaft and the gearbox is improved, reducing vibration and deviation during operation. A centering plate and coupling connect the gearbox output shaft and the generator input shaft, improving the matching accuracy of the transmission components. An encoder at the generator output end allows for precise detection of the generator speed, providing accurate data for monitoring the system's operating status.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a main shaft speed change system for a wind power generation simulation device, comprising a geared motor, a motor sprocket, a main shaft, a mounted bearing, an electric slip ring, a main shaft sprocket, a parallel shaft gearbox, a centering plate, a coupling, a generator, and an encoder; the output shaft of the geared motor is connected to the motor sprocket, the motor sprocket is connected to the main shaft sprocket via chain drive, and the main shaft sprocket is sleeved on the main shaft; the mounted bearing is sleeved on the main shaft and provides support thereto, and the electric slip ring is sleeved on the main shaft; the input shaft of the parallel shaft gearbox is a hollow shaft, and the end of the main shaft passes through the hollow shaft and is fixed by a locking structure; the output shaft of the parallel shaft gearbox is connected to one end of the coupling via the centering plate, and the other end of the coupling is connected to the input shaft of the generator; the encoder is disposed at the output end of the generator and is used to detect the rotational speed of the generator.

[0007] To further optimize this utility model, the following technical solutions may be preferred:

[0008] Preferably, the locking structure includes a locking disc disposed at the end of the hollow shaft. The locking disc is fixed to the hollow shaft by bolts. Tightening the bolts to a set torque can lock the spindle and the hollow shaft.

[0009] Preferably, it also includes a braking assembly, which includes a brake disc and a brake, wherein the brake disc is fitted on the transmission path between the parallel shaft gearbox and the centering disc, and the brake cooperates with the brake disc to achieve the braking function.

[0010] Preferably, it further includes a measurement reference assembly, which includes a reference plate, a measurement base plate, a bearing housing fixing liner, and a bearing housing flexible gasket; the bearing with a mounting seat is mounted on the mounting base through the bearing housing flexible gasket, and the bearing housing fixing liner is used to fix the base of the bearing with a mounting seat; the reference plate is provided with a horizontal reference surface and a vertical reference surface for measuring the height and parallelism of the spindle.

[0011] Preferably, an adjusting shim is provided between the spindle and the bearing with seat, the adjusting shim being used to adjust the height accuracy of the spindle so that the height error of the spindle is ≤0.05mm.

[0012] Preferably, the axial offset between the motor sprocket and the main shaft sprocket is ≤0.5mm, which is detected and adjusted by using a steel ruler and feeler gauge.

[0013] Preferably, the centering plate includes a gearbox-side centering plate and a generator-side centering plate, which are connected by the coupling; the coaxiality of the gearbox-side centering plate and the generator-side centering plate is ≤0.5mm, which is detected and adjusted by a lever-type dial indicator with a magnetic base.

[0014] Preferably, it also includes a control module, which is electrically connected to the geared motor and the encoder; the control module can receive manually input speed parameters or automatically input multi-segment wind speed and duration parameters, and control the start and stop and speed adjustment of the geared motor; when the set wind speed is less than 3m / s, the control module controls the geared motor to stop running.

[0015] Preferably, the torque support of the parallel shaft gearbox is provided with an adjusting nut, which can be used to adjust the levelness of the gearbox.

[0016] Preferably, after the main shaft passes through the hollow shaft of the gearbox, a pitch system is also connected to the main shaft, and the main shaft can drive the pitch system to rotate synchronously.

[0017] This utility model has the following beneficial effects:

[0018] (1) Reasonable structural design and strong transmission stability: The chain drive structure composed of a geared motor, motor sprocket and main shaft sprocket can stably transmit power and accurately simulate the process of the wind turbine driving the main shaft to rotate. The power transmission efficiency is high and it is not easy to slip. The input shaft of the parallel shaft gearbox adopts a hollow shaft design, with the end of the main shaft passing through it and fixed by a locking structure. This connection method can effectively ensure the coaxiality of the main shaft and the gearbox input shaft, reduce vibration and deviation during transmission, and improve the overall transmission stability. At the same time, the use of the intermediate plate and coupling further improves the transmission matching accuracy between the gearbox output shaft and the generator input shaft, and reduces wear and noise caused by misalignment of components.

[0019] (2) Convenient and efficient installation and adjustment: The bearing with a mounting seat is installed and fixed by the flexible shims and the fixed liner of the bearing seat. With the help of the adjusting shims, the main shaft can be adjusted to the same height. The parallelism can be adjusted by tapping the bearing with a copper rod or rubber hammer. The operation is simple and the adjustment accuracy can meet the requirements of ≤0.05mm height error and ≤0.1mm parallelism. The adjusting nut at the gearbox torque support facilitates quick leveling of the gearbox. The axial offset between the motor sprocket and the main shaft sprocket can be checked and adjusted by a steel ruler and feeler gauge. The coaxiality of the center plate can be checked and adjusted by a lever-type dial indicator with a magnetic base. The installation and adjustment of each component have clear operating methods and accuracy standards, which greatly reduces the difficulty of installation and debugging.

[0020] (3) Precise speed detection and flexible control: The encoder at the generator output end can detect the generator speed in real time, providing accurate data support for monitoring the system's operating status. The control module can receive manually input speed parameters or automatically input multi-segment wind speed and duration parameters to realize the start and stop of the geared motor and speed adjustment. When the set wind speed is less than 3m / s, it will automatically stop running, which not only meets the needs of different simulation scenarios, but also conforms to the actual operating logic of wind power generation, improving the realism and controllability of the simulation.

[0021] (4) Strong functional adaptability and excellent simulation effect: The main shaft can drive the pitch system to rotate synchronously, which can simultaneously simulate the motion state of the wind turbine, main shaft and pitch system, making the simulation scenario closer to the actual wind power generation system. The gearbox converts the low-speed, high-torque motion of the main shaft into high-speed, low-torque motion, ensuring that the generator is within the operating speed range, realizing the effective simulation of the power generation function, and providing a reliable experimental platform for wind power generation-related technical research, teaching and training. Attached Figure Description

[0022] Figure 1 Overall structural installation diagram of the spindle speed change system Figure 1 ;

[0023] Figure 2 Overall structural installation diagram of the spindle speed change system Figure 2 ;

[0024] Figure 3 A schematic diagram of the module connection structure of the spindle speed change system;

[0025] Figure 4 A schematic diagram of the main spindle speed change system.

[0026] Figure 5 This is a top view of the main spindle speed change system.

[0027] In the diagram: 1. Main shaft; 2. Bearing with mounting plate; 3. Slip ring; 4. Main shaft sprocket; 5. Parallel shaft gearbox; 6. Brake; 7. Brake disc; 8. Gearbox side centering plate; 9. Coupling; 10. Generator side centering plate; 11. Generator; 12. Encoder; 13. Measuring base plate; 14. Bearing housing fixing plate; 15. Gear motor; 16. Generator fixing plate; 17. Pitch system; 18. Support frame. Detailed Implementation

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] Example:

[0031] like Figure 1-5 As shown, this embodiment provides a main shaft speed change system for a wind power generation simulation device. Its overall structure includes a support frame 18, on which a geared motor 15, a motor sprocket, a main shaft 1, a bearing 2 with a mounting seat, an electric slip ring 3, a main shaft sprocket 4, a parallel shaft gearbox 5, a centering plate, a coupling, a generator, an encoder, a braking assembly, a measurement reference assembly, and a control module are installed.

[0032] The support frame 18 is equipped with a measuring base plate 13, a bearing seat fixing plate 14, and a generator fixing plate 16, respectively located below the main shaft, below the bearing seat, and below the generator. A geared motor 15 drives the main shaft sprocket 4 on the main shaft to rotate under set parameters. This rotation, via chain drive, causes the main shaft connected to the other end of the sprocket to rotate. The main shaft 1 then drives the pitch system 17 and the hollow shaft of the gearbox to rotate synchronously, simulating the low-speed rotation of the wind turbine and main shaft at a set wind speed. The gearbox converts the low-speed, high-torque input from the main shaft into high-speed, low-torque output. The gearbox output shaft sequentially drives the center plate, coupling, and generator shaft to rotate, thus putting the generator into operation and enabling power generation. An encoder on the rear of the generator detects and records the generator's rotational speed.

[0033] I. Structure and Connection Relationships of Each Component

[0034] ① Power input and transmission components: The output shaft of the geared motor 15 is fixed to the motor sprocket via a key connection. The motor sprocket and the main shaft sprocket 4 are connected by a chain to form a chain drive. The main shaft sprocket 4 is fitted onto the middle of the main shaft with an interference fit. The two ends of the main shaft are shaft sections of different diameters. The thicker shaft section is used to install the bearing with a mounting seat and the slip ring, while the thinner shaft section is used to pass through the hollow shaft of the gearbox.

[0035] ② Support and connection components: Two seated bearings 2 are provided, respectively fitted onto the main shaft 1 near both ends. A flexible bearing housing gasket is provided below the bearing housing base. The seated bearings 2 are fixed to the mounting base by the bearing housing fixing plate 14 and bolts. An electric slip ring 3 is fitted onto the side of the main shaft near the main shaft sprocket, and its lead wire is led out to the control system through a fixed bracket.

[0036] ③ Transmission and Generator Components: The input shaft of the parallel shaft gearbox 5 is a hollow shaft. The thinner end of the main shaft passes through the hollow shaft. The locking disc at the end of the hollow shaft is connected to the hollow shaft by 12 M10 bolts. Tightening the bolts to a set torque of 350 N·m achieves rigid locking between the main shaft and the hollow shaft. The gearbox output shaft is sequentially connected to the gearbox-side centering plate 8, coupling 9, and generator-side centering plate 10, and finally flexibly connected to the input shaft of the generator 11 via a coupling. The generator output end is connected to the encoder 12 via a flange. The encoder is an incremental photoelectric encoder with a resolution of 1024 lines.

[0037] ④ Auxiliary components: The brake disc 7 of the braking assembly is keyed and sleeved on the gearbox output shaft. The brake 6 is fixed on the measuring base plate 13. The gap between the brake disc and the brake pads of the brake 6 is adjusted to 0.3-0.5mm. The reference plate of the measuring reference assembly is made of 45# steel. The flatness of the horizontal and vertical reference surfaces is ≤0.02mm. The flexible gasket of the bearing seat is made of nitrile rubber with a thickness of 5mm.

[0038] II. Installation and Adjustment Process

[0039] (1) Spindle Installation and Adjustment: First, place the flexible shim of the bearing housing above the mounting hole of the bearing with housing. Then, sequentially insert the electric slip ring, spindle sprocket, and two bearings with housing onto the spindle. Adjust the position of the bearings with housing to align the mounting holes. Use M12 bolts to pre-fix the bearing housing fixing plate (pre-tightening torque 100 N·m). Using a lever-type dial indicator, with the horizontal reference plane of the reference plate as the reference, measure the elevation values ​​at both ends of spindle 1. Add 0.02 mm and 0.05 mm shims to make the elevation error ≤ 0.05 mm. After each adjustment, tighten the bolts to the set torque of 250 N·m. After the elevation adjustment is completed, measure the parallelism with the vertical reference plane of the reference plate as the reference. Use a copper rod to lightly tap the bearings with housing to make the parallelism ≤ 0.1 mm. Finally, tighten the bolts to 300 N·m.

[0040] (2) Gearbox and chain drive adjustment: Insert the hollow shaft of the gearbox into the thin end of the main shaft. Adjust the level of the gearbox using the M16 adjusting nut of the gearbox torque support (level error ≤ 0.05mm / m), and tighten the locking disc bolts to the set torque. Install the motor sprocket onto the output shaft of the geared motor. Use the edge of a steel ruler to press against the end face of the sprocket, and adjust the position of the main shaft sprocket so that the axial offset is ≤ 0.5mm (check with a 0.5mm feeler gauge to ensure no gap). Install the chain and connect it through the chain links. Adjust the chain tension so that the sag is 1% to 2% of the chain span.

[0041] (3) Coupling alignment adjustment: Two lever-type dial indicators with magnetic bases are attached to the centering plate on the gearbox side. The cylindrical surface and end face of the centering plate on the generator side are measured respectively. The high-speed shaft is rotated to record the dial indicator values. By fine-tuning the height and deflection angle of the generator base, the coaxiality is ≤0.5mm and the end face runout is ≤0.1mm.

[0042] III. Operation Control Method

[0043] ① Manual control: Input speed command (0-100r / min adjustable) to the control module via the touch screen. The control module drives the geared motor to run at the set speed. The touch screen displays the generator speed detected by the encoder in real time (display accuracy 0.1r / min). The system operation status can be controlled in real time via the start / stop button.

[0044] ② Automatic Control: Multiple wind speed parameters (e.g., 3m / s, 5m / s, 8m / s) and corresponding durations (e.g., 60s, 120s, 90s) can be set on the touchscreen. After a 3-second start-up delay, the geared motor automatically adjusts its speed according to the wind speed-speed curve (3m / s wind speed corresponds to 10r / min speed, with an increase of 5r / min for every 1m / s increase). When the set wind speed is <3m / s, the control module outputs a stop signal, and the brake completes braking within 2 seconds.

[0045] IV. Work Process

[0046] The geared motor drives the motor sprocket to rotate according to set parameters. This rotation, via a chain, drives the main shaft sprocket and main shaft to rotate synchronously (5-50 r / min). The main shaft then drives the pitch control system and the hollow shaft of the gearbox to rotate synchronously. The gearbox converts the low-speed input motion into high-speed output motion (500-3000 r / min), which is transmitted to the generator via the centering plate and coupling, causing the generator to generate electricity. The encoder monitors the generator speed in real time and feeds it back to the control module. When the speed exceeds the set value (±5%), the system automatically issues an alarm signal. During braking, the brake pads grip the brake disc, stopping the system within 5 seconds.

[0047] This embodiment, through the above-described structural design and installation control method, can stably simulate the wind power generation main shaft speed change process within the wind speed range of 3 to 12 m / s. The generator output voltage is stable at 380V±5%, and the operating noise is ≤75dB, meeting the requirements for use of the simulation device.

[0048] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A main shaft speed change system for a wind power generation simulation device, characterized in that, The system includes a geared motor, a motor sprocket, a main shaft, a mounted bearing, an electric slip ring, a main shaft sprocket, a parallel shaft gearbox, a centering plate, a coupling, a generator, and an encoder. The output shaft of the geared motor is connected to the motor sprocket, which is connected to the main shaft sprocket via a chain drive. The main shaft sprocket is mounted on the main shaft. The mounted bearing is mounted on and supports the main shaft, and the electric slip ring is mounted on the main shaft. The input shaft of the parallel shaft gearbox is a hollow shaft, and the end of the main shaft passes through the hollow shaft and is fixed by a locking structure. The output shaft of the parallel shaft gearbox is connected to one end of the coupling via the centering plate, and the other end of the coupling is connected to the input shaft of the generator. The encoder is located at the output end of the generator and is used to detect the rotational speed of the generator.

2. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, The locking structure includes a locking disc disposed at the end of the hollow shaft. The locking disc is fixed to the hollow shaft by bolts. Tightening the bolts to a set torque can lock the spindle and the hollow shaft.

3. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, It also includes a braking assembly, which includes a brake disc and a brake. The brake disc is fitted on the transmission path between the parallel shaft gearbox and the centering disc, and the brake works in conjunction with the brake disc to achieve the braking function.

4. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, It also includes a measurement reference assembly, which includes a reference plate, a measurement base plate, a bearing housing fixing liner, and a bearing housing flexible gasket; the bearing with a seat is mounted on the mounting base through the bearing housing flexible gasket, and the bearing housing fixing liner is used to fix the base of the bearing with a seat; the reference plate has a horizontal reference surface and a vertical reference surface, which are used for measuring the height and parallelism of the spindle.

5. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, An adjusting shim is provided between the spindle and the bearing seat. The adjusting shim is used to adjust the height accuracy of the spindle so that the height error of the spindle is ≤0.05mm.

6. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, The axial offset between the motor sprocket and the main shaft sprocket is ≤0.5mm, which is detected and adjusted by using a steel ruler and feeler gauge.

7. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, The centering plate includes a gearbox-side centering plate and a generator-side centering plate, which are connected by the coupling; the coaxiality of the gearbox-side centering plate and the generator-side centering plate is ≤0.5mm, which is detected and adjusted by a lever-type dial indicator with a magnetic base.

8. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, It also includes a control module, which is electrically connected to the geared motor and the encoder; the control module can receive manually input speed parameters or automatically input multi-segment wind speed and duration parameters, and control the start and stop and speed adjustment of the geared motor; when the set wind speed is less than 3m / s, the control module controls the geared motor to stop running.

9. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, The parallel shaft gearbox has an adjusting nut at its torque support, which allows the gearbox to be leveled.

10. The main shaft speed change system for a wind power generation simulation device according to claim 1, characterized in that, After the main shaft passes through the hollow shaft of the gearbox, a pitch system is also connected to the main shaft, and the main shaft can drive the pitch system to rotate synchronously.

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