Blade adjusting mechanism and wind power overhaul practical training platform

Abstract

The invention relates to the technical field of energy-saving refrigeration, in particular to a blade adjusting mechanism and a wind power overhaul practical training platform, and the blade adjusting mechanism comprises a rotation driving part which comprises a main shaft and an annular structure fixed at the outer side, and a medium is arranged in the annular structure; the sliding transmission mechanism comprises a rotating cylinder, a sliding block and a fixed cylinder, a guide structure is arranged in the rotating cylinder, a protrusion matched with the guide structure is arranged outside the sliding block, and when a medium pushes the sliding block to slide, the sliding block drives the rotating cylinder to rotate relative to the fixed cylinder, so that a gas channel is formed; and a gear driving mechanism. The device has the beneficial effects that the medium thrust is directly related to the blade rotating speed, and when the simulated wind speed is increased, the blade rotating speed is increased, and the centrifugal force is enhanced, so that the sliding distance of the sliding block is automatically adjusted, and the self-adaptive adjustment of the blade angle is realized. The multiple sets of converter units in the scheme operate independently, other units cannot be affected when a certain unit breaks down, the system can still maintain partial operation, and the reliability is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine training, in particular to a blade adjustment mechanism and a wind power maintenance training platform. Background Art

[0002] Wind power, second only to hydropower as the most mature renewable energy technology, accounts for the vast majority of total installed renewable energy capacity. Variable-speed constant-frequency generators (VSCF) have become the mainstream model for wind power generation due to their high wind energy utilization. However, wind turbines are large devices, often located high up in the sky on towers where strong winds prevail. This presents significant challenges in both installation and maintenance, resulting in a heavy workload and significant time and effort.

[0003] With the rapid development of wind power, the installed capacity of wind turbines continues to grow, and the demand for wind turbine assembly and maintenance personnel has also increased accordingly. However, due to the limitations of on-site operating conditions, both wind power students and maintenance personnel can only master all wind turbine components at a theoretical level.

[0004] Currently, existing wind power training platforms rely too heavily on manual operation or simple fixed mechanical structures for blade angle adjustment. These mechanisms lack dynamic adaptive adjustment capabilities and are unable to realistically simulate the automatic pitch adjustment process of blades in response to changing wind speeds. This results in low realism when simulating complex operating conditions (such as sudden changes in wind speed), which in turn affects teaching effectiveness. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the practical training device exhibits low authenticity when simulating complex working conditions (such as sudden changes in wind speed), thereby affecting the teaching effect.

[0006] The above technical problems are solved by the following technical solutions: The present invention proposes a blade adjustment mechanism, which includes a rotating drive part, including a main shaft and an annular structure fixed on the outside, and a medium is provided inside the annular structure; a sliding transmission mechanism, including a rotating cylinder, a slider and a fixed cylinder, a guide structure is provided inside the rotating cylinder, and a protrusion that cooperates with the guide structure is provided on the outside of the slider. When the medium pushes the slider to slide, the slider drives the rotating cylinder to rotate relative to the fixed cylinder to form a gas channel; a gear drive mechanism, including a face gear, and a drive groove connected to the gas channel is opened on the face gear. When the gas enters the drive groove, it drives the face gear to drive the meshing driven gear to rotate, and the driven gear drives the connected blade to adjust the angle.

[0007] In a preferred embodiment of the blade adjustment mechanism of the present invention: the annular structure is a hollow annular structure, the interior of the annular structure is filled with a flowable medium, the annular structure is fixed to the main shaft, the main shaft and the blades are connected through a rotating seat, and rotate synchronously with the blades.

[0008] In a preferred embodiment of the blade adjustment mechanism of the present invention: the sliding transmission mechanism includes an annular shell, the fixed cylinder is fixedly connected to the annular shell, the outer side of the rotating cylinder is rotatably connected to the fixed cylinder, the guide structure is an arc-shaped guide groove, and a protrusion that cooperates with the arc-shaped guide groove is provided on the outer side of the slider. The slider slides axially along the rotating cylinder under the push of the medium, and the arc-shaped guide groove is squeezed by the protrusion to drive the rotating cylinder to rotate relative to the fixed cylinder.

[0009] In a preferred embodiment of the blade adjustment mechanism of the present invention: air holes are opened on both the rotating cylinder and the fixed cylinder, and the air holes include a first air hole and a second air hole. When the rotating cylinder rotates to a preset angle, the first air hole and the second air hole are aligned and connected to form a gas channel, and the compressed gas flows from the air inlet end into the drive groove through the gas channel.

[0010] In a preferred embodiment of the blade adjustment mechanism of the present invention: a force spring is provided in the driving groove. After the compressed gas enters the driving groove, the gas pressure overcomes the elastic force of the force spring and pushes the face gear to rotate relative to the annular housing.

[0011] In a preferred embodiment of the blade adjustment mechanism of the present invention: a limit rod is fixed to the end of the slider away from the medium, which is used to limit the rotation of the slider. A control block is fixed to the surface of the limit rod, and an inclined groove is provided on the control block. The inclined groove changes the driving force of the damping rod provided below as the control block moves.

[0012] In a preferred embodiment of the blade adjustment mechanism of the present invention: a return spring is provided on the outer side of the damping rod. When the damping rod changes the driving force in the inclined groove, it slides axially upward under the action of the return spring. A damping groove is provided on the face gear, and a plurality of step grooves are provided in the damping groove. When the damping rod slides upward, its damping end is separated step by step from the bottom step groove, thereby reducing the rotation constraint on the opposite gear.

[0013] In a preferred embodiment of the blade adjustment mechanism of the present invention: the sliding transmission mechanism includes a compression spring, which is sleeved on the limit rod and applies elastic force to the slider in the initial state. When the pushing force generated by the medium is greater than the elastic force of the compression spring, the slider overcomes the elastic force and slides along the fixed cylinder to a preset distance.

[0014] In order to solve the above technical problems, the present invention also provides the following technical solutions: a wind power maintenance training platform, including a blade adjustment mechanism, and a simulation platform, including a wind turbine model, whose input end is connected to the main shaft; the wind turbine model also includes a power conversion device, including multiple sets of independently operated converter units, which realize power conversion through internal electrical pathways, and the electric energy is sequentially rectified, distributed and inverted from the input end, and finally output to the external power grid; a parallel connection structure, including multiple sets of converter units interconnected by cables to form a parallel operation mode, and the cables transmit electrical signals and power flows to ensure that each converter unit operates synchronously and shares the load.

[0015] In a preferred embodiment of the wind power maintenance training platform of the present invention: the power conversion device includes a distribution cabinet, and a control unit is provided in the distribution cabinet. The control unit controls the action of the switching elements in the distribution cabinet through electrical signals to realize power distribution and protection of the converter equipment.

[0016] The beneficial effects of the present invention are as follows: the annular structure in the rotating drive member has a built-in flowable medium, which rotates synchronously with the blades through the main shaft. The medium is radially displaced under the action of centrifugal force, generating axial thrust to drive the slider to slide. The magnitude of the centrifugal force is directly related to the blade rotation speed. When the simulated wind speed increases, the blade rotation speed increases, the centrifugal force increases, and the medium thrust increases accordingly, thereby automatically adjusting the sliding distance of the slider and realizing adaptive adjustment of the blade angle.

[0017] The damping adjustment mechanism dynamically releases the rotational constraints of the face gear by gradually separating the damping rod from the stepped groove, allowing the blade angle adjustment range to adaptively expand with the speed. This design effectively responds to wind speed fluctuations, preventing over- or under-adjustment of the blade angle and improving the device's operational stability.

[0018] Traditional wind power systems often use a single or small number of converters, and a failure can cause the entire system to shut down. However, this solution's multiple converter units operate independently, so a failure in one unit does not affect others, allowing the system to maintain partial operation, significantly improving reliability. Automatic blade angle adjustment enhances the main shaft's rotational power, thereby increasing the generator's output power. After rectification, distribution, and inversion, the electrical energy is more efficiently transmitted to the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0020] Figure 1 A perspective view of the rotary drive member of the blade adjustment mechanism is shown;

[0021] Figure 2 An exploded view of the sliding transmission mechanism of the blade adjustment mechanism is shown;

[0022] Figure 3 An enlarged perspective view of the sliding transmission mechanism of the blade adjustment mechanism is shown;

[0023] Figure 4 A perspective view of the stepped groove of the blade adjustment mechanism is shown;

[0024] Figure 5 A three-dimensional diagram of a wind turbine model of a wind power maintenance training platform is shown;

[0025] Figure 6 Shows the system block diagram of the wind power maintenance training platform. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0027] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0028] Reference Figure 1-2 , this embodiment provides a blade adjustment mechanism, including a rotary drive member 1, including a main shaft 11 and an outer annular structure 12, the annular structure 12 has a medium built in, and generates a centrifugal driving force as the main shaft 11 rotates; a sliding transmission mechanism 2, including a rotating cylinder 21, a slider 22 and a fixed cylinder 23, the rotating cylinder 21 has a guide structure 24, and the slider 22 has a protrusion on the outside that cooperates with the guide structure 24, when the medium pushes the slider 22 to slide, the slider 22 drives the rotating cylinder 21 to rotate relative to the fixed cylinder 23; air holes 3 are provided on both the rotating cylinder 21 and the fixed cylinder 23, when the rotating cylinder 21 rotates to a specific angle, the air holes 3 are aligned to form a gas channel; a gear drive mechanism 4, including a face gear 41 and a driven gear 42 meshing with the face gear 41, a driving groove 43 connected to the gas channel is provided on the face gear 41, when gas enters the driving groove 43, the face gear 41 is pushed to rotate, and the face gear 41 drives the meshed driven gear 42 and the blade 44 fixed on the driven gear 42 to adjust the angle.

[0029] In this embodiment, the annular structure 12 is filled with a medium (such as liquid or granular material). When the main shaft 11 rotates, the annular structure 12 rotates synchronously with the main shaft 11, and the medium moves toward the outside of the annular structure 12 under the action of centrifugal force, generating an outward driving force.

[0030] The rotating drum 21 is internally provided with a guide structure 24 (e.g., a spiral groove). The outer surface of the slider 22 has a protrusion (e.g., a pin or boss) that engages with the guide structure 24. The fixed drum 23 is sleeved onto the outer surface of the rotating drum 21 and remains stationary. The centrifugal force of the medium pushes the slider 22 along the guide structure 24, causing the rotating drum 21 to rotate relative to the fixed drum 23.

[0031] The walls of the rotating drum 21 and the fixed drum 23 each have air holes 3, such as circular holes or elongated holes. When the rotating drum 21 rotates to a specific angle, the air holes 3 on the rotating drum 21 align with the air holes 3 on the fixed drum 23. The two air holes 3 overlap to form a connected air channel, allowing air to pass through.

[0032] Face gear 41 is provided with a drive slot 43, such as an arc-shaped slot, which communicates with the gas passage. When gas enters drive slot 43 through the gas passage, the airflow impacts the inner wall of drive slot 43, driving face gear 41 to rotate. The rotation of face gear 41, through the meshing of the teeth, drives driven gear 42, which is fixedly connected to blades 44. The rotation angle of blades 44 changes accordingly, automatically adjusting the angle of blades 44 to accommodate changes in simulated wind speed.

[0033] refer to Figure 1-2 In one embodiment provided herein, the annular structure 12 in the rotary drive member 1 is a hollow annular structure 12 filled with a flowable medium. The annular structure 12 is connected to the blades 44 via the main shaft 11 and rotates synchronously with the blades 44. The centrifugal force generated by the rotation causes the medium to displace radially outward. After the medium is displaced, it contacts the slider 22 of the sliding transmission mechanism 2, generating a driving force that drives the slider 22 to slide axially along the rotating drum 21. The sliding transmission mechanism 2 includes an annular housing 26, a fixed cylinder 23 fixedly connected to the annular housing 26, and the outer side of the rotating drum 21 is rotatably connected to the fixed cylinder 23. The guide structure 24 is an arcuate guide groove, and the outer side of the slider 22 is provided with a protrusion that cooperates with the arcuate guide groove. Under the push of the medium, the slider 22 slides axially along the rotating drum 21, and the protrusion squeezes the arcuate guide groove, driving the rotating drum 21 to rotate to a preset angle relative to the fixed cylinder 23.

[0034] In this embodiment, the annular structure 12 is hollow and filled with a flowable medium (such as a liquid or fine particles). The hollow annular structure 12 is connected to the blades 44 via the main shaft 11 and the rotating base 111. When the blades 44 rotate, the main shaft 11 drives the hollow annular structure 12 to rotate synchronously. The centrifugal force generated by the rotation of the annular structure 12 causes the internal medium to move radially toward the outer wall of the annular structure 12, where the medium accumulates within the annular structure 12 and is displaced outward.

[0035] The displaced medium comes into direct contact with the slider 22 of the sliding transmission mechanism 2. The slider 22 is located inside the drum 21. When the medium gathers outside the annular structure 12, it squeezes the end surface of the slider 22 in the axial direction, generating an axial thrust, causing the slider 22 to slide in the axial direction of the drum 21.

[0036] The fixed cylinder 23 is fixedly connected to the annular housing 26 by bolts or welding, maintaining its stationary position. The outer side of the rotating cylinder 21 is connected to the fixed cylinder 23 via bearings or sleeves, allowing the rotating cylinder 21 to rotate relative to the fixed cylinder 23. The inner wall of the rotating cylinder 21 is provided with an arcuate guide groove (such as a spiral or inclined groove). The outer side of the slider 22 has a protrusion (such as a cylindrical pin or a bump) that engages within the arcuate guide groove. When the medium pushes the slider 22 to slide axially along the rotating cylinder 21, the protrusion moves along the arcuate guide groove, pressing against the groove wall, forcing the rotating cylinder 21 to rotate relative to the fixed cylinder 23 until the rotating cylinder 21 reaches a predetermined rotation angle.

[0037] As the rotating drum 21 rotates, the air holes 3 on it align with the air holes 3 on the fixed drum 23, forming a gas channel. The gas enters the drive groove 43 of the gear drive mechanism 4 through the channel, driving the face gear 41 to rotate, and then drives the blade 44 through the driven gear 42 to adjust the angle.

[0038] refer to Figure 2-3 As an optional embodiment, the air holes 3 include a first air hole 31 and a second air hole 32. When the drum 21 rotates to a preset angle, the first air hole 31 and the second air hole 32 align and connect, forming a gas channel. Compressed gas flows from the air inlet end into the drive groove 43 through this gas channel. During the sliding process of the slider 22, the protrusion cooperates with the arc-shaped guide groove to control the rotation angle of the drum 21, thereby opening or closing the air holes 3. A force spring 431 is installed in the drive groove 43. After the compressed gas enters the drive groove 43, the gas pressure overcomes the elastic force of the force spring 431, pushing the face gear 41 to rotate relative to the annular housing 26 to a preset angle. The face gear 41 drives the fixed end of the blade 44 to rotate through the meshing driven gear 42, thereby adjusting the angle of the blade 44.

[0039] In this embodiment, a first air hole 31 and a second air hole 32 (e.g., a circular hole or a rectangular hole) are respectively defined in the rotating cylinder 21 and the fixed cylinder 23. When the rotating cylinder 21 is rotated to a predetermined angle by the slider 22, the first air hole 31 and the second air hole 32 overlap and align to form a connected air passage. Compressed gas flows from the air inlet (e.g., the external air source interface) through this air passage into the drive groove 43 of the gear drive mechanism 4.

[0040] The slider 22 is located inside the drum 21 and features a protrusion (such as a cylindrical pin or boss) on its exterior. This protrusion engages an arcuate guide groove (such as a spiral groove or an inclined groove) on the inner wall of the drum 21. As the slider 22 slides axially along the drum 21, propelled by the medium, the protrusion moves along the arcuate guide groove, compressing the groove wall and driving the drum 21 to rotate relative to the fixed drum 23. The rotation angle of the drum 21 is determined by the length and angle of the arcuate guide groove, ensuring precise alignment or misalignment between the first and second air holes 31, 32, thereby controlling the opening or closing of the gas passage.

[0041] The face gear 41 of the gear drive mechanism 4 is provided with a drive groove 43 (e.g., an arcuate groove) that communicates with the gas passage. A force spring 431 (e.g., a coil spring or leaf spring) is secured within the drive groove 43. Compressed gas enters the drive groove 43 through the gas passage. The gas pressure acts on the inner wall of the drive groove 43, overcoming the elastic force of the force spring 431 and driving the face gear 41 to rotate relative to the annular housing 26 until the face gear 41 reaches a predetermined rotation angle.

[0042] The face gear 41 meshes with the driven gear 42 through its tooth surface. The driven gear 42 is fixedly connected (e.g., via bolts or keys) to the fixed end of the blade 44. When the face gear 41 rotates, it drives the driven gear 42 to rotate synchronously. The rotation of the driven gear 42 causes the fixed end of the blade 44 to rotate about its axis, thereby changing the inclination angle of the blade 44.

[0043] The main shaft 11 rotates the hollow annular structure 12. Centrifugal force displaces the medium radially, pushing the slider 22 axially. The slider 22 drives the rotating drum 21 through the arc-shaped guide groove. The rotation of the rotating drum 21 aligns the air holes 3 to form a gas channel. Gas enters the drive groove 43, driving the face gear 41 to rotate. Ultimately, the driven gear 42 adjusts the angle of the blade 44.

[0044] refer to Figure 2-4As an optional embodiment, a limit rod 221 is fixed to the end of the slider 22 away from the medium, restricting the rotation of the slider 22 and ensuring that the slider 22 slides axially along a predetermined path within the fixed cylinder 23. A control block 222 is fixed to the surface of the limit rod 221. The control block 222 is provided with an inclined groove. The inclined groove changes the driving force on the damping rod 223 as the control block 222 moves. A return spring is sleeved on the outer side of the damping rod 223. When the inclined groove changes the driving force, the damping rod 223 slides axially upward under the action of the return spring. The face gear 41 is provided with a damping groove 224. The damping groove 224 has multiple stepped grooves 225. When the damping rod 223 slides upward, its damping end gradually separates from the bottommost stepped groove 225, reducing the rotation constraint on the face gear 41 and further expanding the rotation angle of the face gear 41. The sliding distance of slider 22 is related to the rotation speed of blade 44. When the rotation speed of blade 44 increases, the centrifugal force generated by the rotation of annular structure 12 increases, the driving force of the medium on slider 22 increases, and the sliding distance of slider 22 increases. Control block 222 further pushes damping rod 223 upward through the inclined groove. Damping rod 223 separates step by step from multiple stepped grooves 225, dynamically adjusting the rotation angle of face gear 41, thereby achieving adaptive adjustment of the angle of blade 44 and simulating the automatic pitch change process under wind force changes. Sliding transmission mechanism 2 includes a compression spring, which is mounted on limit rod 221. In the initial state, the compression spring applies elastic force to slider 22. When the driving force generated by the medium is greater than the elastic force of the compression spring, slider 22 overcomes the elastic force and slides along fixed cylinder 23 to a preset distance. When the driving force of the medium decreases, the compression spring assists slider 22 in resetting, ensuring the stability and repeatability of the movement of slider 22.

[0045] In this embodiment, the slider 22 is located inside the rotating drum 21, and a limiting rod 221 (such as a cylindrical rod or a square rod) is fixedly connected to the end away from the medium. The limiting rod 221 cooperates with the guide structure 24 on the inner wall of the fixed drum 23 to limit the rotation of the slider 22 around the axis, ensuring that the slider 22 slides only along the predetermined axial path of the fixed drum 23. A compression spring (such as a coil spring) is sleeved on the outer side of the limiting rod 221. One end of the compression spring is fixed to the slider 22, and the other end abuts the inner wall of the fixed drum 23. In the initial state, the compression spring applies an elastic force toward the medium to the slider 22. When the hollow annular structure 12 rotates and the medium is radially displaced by centrifugal force and axially squeezes the slider 22, the thrust of the medium overcomes the elastic force of the compression spring, pushing the slider 22 to slide axially along the fixed drum 23 to a preset distance.

[0046] The surface of the limiting rod 221 is fixedly connected to a control block 222, and the control block 222 is provided with an inclined groove, such as a straight inclined groove or an arc-shaped groove. The inclined groove contacts the end of a damping rod 223. A return spring is sleeved on the outside of the damping rod 223. One end of the return spring is fixed to the damping rod 223, and the other end is fixed to the fixed cylinder 23 or the annular shell 26. In the initial state, the return spring applies a downward elastic force to the damping rod 223. When the slider 22 slides and drives the limiting rod 221 and the control block 222 to move synchronously, the inclined groove moves with the control block 222. The inclined surface of the inclined groove reduces the extrusion on the end of the damping rod 223, changing the axial thrust on the damping rod 223. Under the combined action of the thrust of the inclined groove and the return spring, the damping rod 223 slides axially upward.

[0047] The face gear 41 is provided with a damping groove 224 (e.g., an arc-shaped groove), and the damping groove 224 has a plurality of stepped grooves 225 (e.g., a trapezoidal structure that rises in sequence). The damping end of the damping rod 223 is initially embedded in the bottom stepped groove 225 of the damping groove 224, constraining the counterclockwise rotation of the face gear 41, as shown in FIG. Figure 1 When the damping rod 223 is pushed upward by the inclined groove, the damping end gradually disengages from the stepped groove 225, moving from the bottom stepped groove 225 to a higher stepped groove 225 or completely disengaging from the bottom stepped groove 225, gradually reducing the resistance to the rotation of the face gear 41 and gradually increasing the rotation angle of the face gear 41.

[0048] The hollow annular structure 12 rotates with the blade 44. When the rotation speed of the blade 44 increases, the rotation speed of the annular structure 12 accelerates, the centrifugal force generated increases, and the axial thrust of the medium on the slider 22 increases, resulting in an increase in the sliding distance of the slider 22. The increase in the sliding distance of the slider 22 causes the control block 222 to drive the inclined groove to move further, and the thrust of the inclined groove on the damping rod 223 increases. The damping rod 223 slides upward a greater distance, and the damping end is separated from more stepped grooves 225, reducing the constraint on the face gear 41, so that the rotation angle of the face gear 41 is further expanded. The face gear 41 drives the fixed end of the blade 44 to rotate through the meshing driven gear 42, changing the angle of the blade 44. It effectively prevents excessive adjustment of the angle of the blade 44, avoids excessive mechanical stress caused by sudden changes in simulated wind speed, and extends the service life of the device.

[0049] The main shaft 11 rotates the hollow annular structure 12. Centrifugal force causes the medium to radially displace, pushing the slider 22 axially. The slider 22 drives the drum 21 through the arcuate guide groove, aligning the first air hole 31 with the second air hole 32 to form a gas channel. Compressed gas enters the drive groove 43, overcoming the force applied by the spring 431 and pushing the face gear 41 to rotate. Simultaneously, the slider 22 dynamically adjusts the rotation angle of the face gear 41 through the interaction of the limit rod 221, the control block 222, the damping rod 223, and the damping groove 224. Ultimately, the driven gear 42 achieves adaptive adjustment of the blade 44 angle.

[0050] Reference Figure 5-6 This embodiment provides a wind power maintenance training platform, including a simulation platform 6, including a wind turbine model 61, whose input end is connected to the main shaft 11; the wind turbine model 61 also includes a power conversion device, including multiple sets of independently operated converter units, which realize power conversion through internal electrical pathways, and the power is sequentially rectified, distributed and inverted from the input end before being output to the external power grid; a parallel connection structure, including multiple sets of converter units interconnected by cables to form a parallel operation mode, and the cables transmit electrical signals and power flow to ensure that the converter units operate synchronously and share the load.

[0051] In this embodiment, the input end of the wind turbine model 61 is fixedly connected to the main shaft 11 via a coupling or a flange, and is driven to rotate by the blades 44 to transmit mechanical power to the interior of the wind turbine model 61 .

[0052] Wind turbine model 61 includes a power conversion device comprising multiple independently operating converter units (e.g., IGBT modules or converters). Each converter unit has an internal electrical path consisting of a rectifier circuit, a DC bus, and an inverter circuit connected in sequence. The rotation of the main shaft 11 drives the generator to generate AC power. This AC power enters the converter unit's input terminal and is first converted to DC power through a rectifier circuit (e.g., a diode bridge or a thyristor rectifier). After being distributed by the DC bus, the DC power enters an inverter circuit (e.g., a PWM inverter), where it is converted to AC power with stable frequency and voltage, and ultimately transmitted to the external power grid through the output terminal.

[0053] Multiple converter units within a power conversion device are interconnected via a parallel connection structure. This structure consists of multiple cables (such as copper or aluminum cables) that connect the input and output terminals of each converter unit, forming an electrical parallel network. The rectifier and inverter circuits of each converter unit transmit electrical signals (such as synchronization control signals or voltage feedback signals) and power flow through the cables. The conductors within the cables ensure that the electrical paths of each converter unit remain synchronized, evenly distributing the load current among the converter units and preventing overloading of a single converter unit.

[0054] The main shaft 11 is driven by the rotation of the blades 44, which in turn rotates the hollow annular structure 12, triggering centrifugal displacement of the medium and pushing the slider 22 to slide. This, in turn, is achieved through the rotation of the drum 21, the alignment of the air holes 3, the coordination of the gas-driven face gear 41, the damping rod 223, and the stepped groove 225, enabling adaptive adjustment of the blade 44 angle. Adjusting the blade 44 angle optimizes the wind-receiving efficiency of the blades 44 and enhances the rotational power of the main shaft 11. The rotational power of the main shaft 11 is transmitted to the power conversion device via the wind turbine model 61. The electrical energy generated by the generator is rectified, distributed, and inverted before being transmitted to the external power grid via cables in a parallel connection structure.

[0055] refer to Figure 5-6As an optional embodiment, the power conversion device includes: a distribution cabinet, which is equipped with a control unit. The control unit controls the operation of switching elements in the distribution cabinet through electrical signals to achieve power distribution and protection of the converter equipment; a grid-side power cabinet, which performs switching actions through internal power semiconductor devices to convert direct current into alternating current and output it to the power grid; and a generator-side power cabinet, which performs switching actions through internal power semiconductor devices to convert alternating current from the wind turbine into direct current.

[0056] The power conversion system consists of two converter units, each consisting of a power distribution cabinet, a generator-side power cabinet, and a grid-side power cabinet. The two converter units are interconnected via parallel cables (such as copper or aluminum cables), which connect the input and output terminals of each converter unit to form an electrical parallel network. The parallel cables transmit electrical signals (such as synchronization pulses or current feedback signals) and power flow, ensuring synchronized switching of the power semiconductor devices in the two converter units and evenly distributing the load current between the two units.

[0057] The power conversion device includes a networking operation module, which is provided with a communication interface (such as an RS485 interface or an Ethernet interface). The communication interface is connected to the control system (such as a SCADA system) of the 5MW wind turbine model (61) through a communication cable or an optical fiber to transmit control instructions (such as switching frequency instructions or power distribution instructions) and operating status data (such as voltage, current or temperature data). The networking operation module receives instructions from the control system through the communication interface, adjusts the electrical signal output of the control unit, and then controls the action of the switch elements and power semiconductor devices in the distribution cabinet, thereby realizing the coordinated operation of the converter equipment and the wind turbine model (61).

[0058] The power distribution cabinet, generator-side power cabinet, and grid-side power cabinet form a power conversion path through internal electrical connections (such as copper busbars, cables, or busbars). Power transmission follows the following sequence: AC power is input from the wind turbine to the generator-side power cabinet and converted to DC power. DC power is transmitted to the distribution cabinet, distributed, and then input to the grid-side power cabinet. The grid-side power cabinet converts DC power to AC power and outputs it to the external grid. This entire path supports parallel operation of two wind turbines via parallel cables.

[0059] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A blade adjustment mechanism, characterized in that: include, The rotary drive member (1) includes a main shaft (11) and an annular structure (12) fixed on the outside, wherein a medium is provided inside the annular structure (12); The sliding transmission mechanism (2) includes a rotating cylinder (21), a slider (22) and a fixed cylinder (23). A guide structure (24) is provided inside the rotating cylinder (21), and a protrusion that cooperates with the guide structure (24) is provided outside the slider (22). When the medium pushes the slider (22) to slide, the slider (22) drives the rotating cylinder (21) to rotate relative to the fixed cylinder (23), forming a gas channel. The gear drive mechanism (4) includes a face gear (41). A driving groove (43) communicating with a gas channel is provided on the face gear (41). When gas enters the driving groove (43), the face gear (41) is pushed to drive the meshed driven gear (42) to rotate. The driven gear (42) drives the connected blades (44) to adjust the angle.

2. The blade adjustment mechanism according to claim 1, characterized in that: The annular structure (12) is a hollow annular structure (12), the interior of the annular structure (12) is filled with a flowable medium, the annular structure (12) is fixed to the main shaft (11), the main shaft (11) and the blade (44) are connected via a rotating seat (111), and rotate synchronously with the blade (44).

3. The blade adjustment mechanism according to claim 2, characterized in that: The sliding transmission mechanism (2) includes an annular housing (26), the fixed cylinder (23) is fixedly connected to the annular housing (26), the outer side of the rotating cylinder (21) is rotatably connected to the fixed cylinder (23), the guide structure (24) is an arc-shaped guide groove, and the outer side of the slider (22) is provided with a protrusion that cooperates with the arc-shaped guide groove. The slider (22) slides axially along the rotating cylinder (21) under the push of the medium, and the protrusion squeezes the arc-shaped guide groove to drive the rotating cylinder (21) to rotate relative to the fixed cylinder (23).

4. The blade adjustment mechanism according to claim 3, characterized in that: The rotating cylinder (21) and the fixed cylinder (23) are both provided with air holes (3), and the air holes (3) include a first air hole (31) and a second air hole (32). When the rotating cylinder (21) rotates to a preset angle, the first air hole (31) and the second air hole (32) are aligned and connected to form a gas channel, and compressed gas flows from the air inlet end into the driving groove (43) through the gas channel.

5. The blade adjustment mechanism according to claim 4, characterized in that: A force spring (431) is provided in the driving groove (43). After the compressed gas enters the driving groove (43), the gas pressure overcomes the elastic force of the force spring (431) and pushes the face gear (41) to rotate relative to the annular housing (26).

6. The blade adjustment mechanism according to claim 5, characterized in that: A limiting rod (221) is fixed to one end of the slider (22) away from the medium, and is used to limit the rotation of the slider (22); a control block (222) is fixed to the surface of the limiting rod (221); an inclined groove is provided on the control block (222); and the inclined groove changes the driving force of a damping rod (223) provided below as the control block (222) moves.

7. The blade adjustment mechanism according to claim 6, characterized in that: A return spring is sleeved on the outer side of the damping rod (223). When the driving force of the inclined groove changes, the damping rod (223) slides upward in the axial direction under the action of the return spring. The face gear (41) is provided with a damping groove (224). The damping groove (224) has a plurality of stepped grooves (225). When the damping rod (223) slides upward, its damping end is separated step by step from the bottom stepped groove (225).

8. The blade adjustment mechanism according to claim 7, characterized in that: The sliding transmission mechanism (2) includes a compression spring, which is sleeved on a limiting rod (221) and applies an elastic force to the slider (22) in an initial state. When the pushing force generated by the medium is greater than the elastic force of the compression spring, the slider (22) overcomes the elastic force and slides along the fixed cylinder (23) to a preset distance.

9. A wind power maintenance training platform, characterized by: comprising the blade adjustment mechanism according to any one of claims 1 to 8, and A simulation platform (6) includes a wind turbine model (61), an input end of which is connected to a main shaft (11); The wind turbine model (61) also includes, The power conversion device includes multiple sets of independently operated converter units, which realize power conversion through internal electrical pathways. The power is rectified, distributed and inverted from the input end, and finally output to the external power grid. The parallel connection structure includes multiple sets of converter units interconnected by cables to form a parallel operation mode. The cables transmit electrical signals and power flow to ensure that each converter unit operates synchronously and shares the load.

10. The wind power maintenance training platform according to claim 9 is characterized in that: The power conversion device includes: A power distribution cabinet is provided with a control unit, which controls the operation of the switch elements in the power distribution cabinet through electrical signals to achieve power distribution and protection for the converter equipment.

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