Wind turbine shaft system torque and bending moment synchronous loading device and method based on electro-hydraulic control

Abstract

The present invention discloses a device and method for synchronously loading torque and bending moments of a wind turbine shaft system based on electro-hydraulic control. The device comprises a torque-loading motor, a shaft system, a torque-loading pump, a torque pressure control valve, a bending moment loading assembly, a bending moment loading pump, a bending moment loading motor, and a controller. The present invention uses an independent electro-hydraulic loading system to load the shaft system with bending moments. The torque load and bending moment load are generated by independent power sources. The working process is stable and reliable, and there is no mutual interference. The bending moment load is generated by applying radial force to the end of the shaft system by the bending moment loading assembly, which can achieve the application of a large-scale bending moment load. The torque load is changed by adjusting the working pressure of the control valve by the controller, and the bending moment load is changed by adjusting the bending moment loading assembly by the controller. The present invention can simultaneously load torque and bending moment loads for dynamic performance test research of the wind turbine shaft system.

Description

Technical Field

[0001] The present invention relates to the field of wind turbine performance testing, and in particular to a device and method for synchronously loading torque and bending moment of a wind turbine shaft system based on electro-hydraulic control. Background Art

[0002] The dynamic performance test of the wind turbine shaft system is an important test to ensure its working reliability. At present, most of the wind turbine shaft system dynamic performance test equipment is only designed for torque loading, not bending moment loading. When the wind turbine is working, the load characteristics of the shaft system are complex, including not only torque load, but also bending moment load in most cases.

[0003] The dynamic characteristics of a wind turbine under the simultaneous action of torque load and bending moment load are significantly different from those under the single action of torque load. In order to accurately obtain the dynamic characteristics of a wind turbine under the simultaneous action of torque load and bending moment load, it is necessary to invent a wind turbine shaft system torque and bending moment synchronous loading device for carrying out dynamic performance test research of the shaft system. Summary of the Invention

[0004] The present invention provides a device and method for synchronous torque and bending moment loading of a wind turbine shaft system based on electro-hydraulic control, which is used to solve the technical problem that the current dynamic performance test research of the wind turbine shaft system can only realize single torque load or bending moment load loading.

[0005] In order to solve the above technical problems, in the first aspect, the present invention proposes a wind turbine shaft system torque and bending moment synchronous loading device based on electro-hydraulic control, including: a torque loading motor, a shaft system, a torque loading pump, a torque pressure control valve, a bending moment loading assembly, a bending moment loading pump, a bending moment loading motor and a controller, the rotating shaft of the torque loading motor is connected to the first end of the shaft system, the second end of the shaft system is connected to the input end of the torque loading pump, the output port of the torque loading pump is connected to the input end of the torque pressure control valve, the rotating shaft of the bending moment loading motor is connected to the input end of the bending moment loading pump, the output end of the bending moment loading pump is connected to the input end of the bending moment loading assembly, the output end of the bending moment loading assembly is connected to the end of the shaft system, and the torque loading motor, torque pressure control valve, bending moment loading assembly and bending moment loading motor are all electrically connected to the controller.

[0006] Furthermore, the shaft system includes a left-end loading bearing, a shaft and a right-end loading bearing, wherein the left-end loading bearing is installed at the first end of the shaft, and the right-end loading bearing is installed at the second end of the shaft.

[0007] Furthermore, the moment loading assembly includes a left-end moment loading assembly for loading the bending moment for the first end of the shaft system, and a right-end moment loading assembly for loading the bending moment for the second end of the shaft system, and the structures of the left-end moment loading assembly and the right-end moment loading assembly are the same.

[0008] Furthermore, it also includes a first coupling, a second coupling and a third coupling. The torque loading motor is connected to the first end of the shaft system through the first coupling, the second end of the shaft system is connected to the input end of the torque loading pump through the second coupling, and the rotating shaft of the moment loading motor is connected to the input end of the moment loading pump through the third coupling.

[0009] Furthermore, the right-end bending moment loading assembly includes a right-end bending moment pressure control valve, a right-end reversing control valve and a right-end loading cylinder, the oil inlet of the right-end reversing control valve is connected to the output end of the bending moment loading pump, the oil outlet of the right-end reversing control valve is connected to the oil inlet of the right-end loading cylinder, the return oil input port of the right-end reversing control valve is connected to the return oil port of the right-end loading cylinder, the return oil output port of the right-end reversing control valve is connected to the input port of the right-end bending moment pressure control valve, and the right-end bending moment pressure control valve and the right-end reversing control valve are both electrically connected to the controller.

[0010] Furthermore, the right-end bending moment loading assembly and the left-end bending moment loading assembly can load bending moments on the shaft system individually, or can simultaneously load bending moments on the shaft system in opposite directions or in the same direction.

[0011] Furthermore, the right-end loading cylinder includes a piston rod and a cylinder body, the piston rod of the right-end loading cylinder is connected to the second end of the shaft system, and the cylinder body of the right-end loading cylinder is fixedly connected to the ground.

[0012] Furthermore, the right end reversing control valve and the left end reversing control valve are both in a neutral oil return state under normal conditions.

[0013] In a second aspect, the present invention further provides a method for synchronously loading the torque and bending moment of a wind turbine shaft system based on electro-hydraulic control. The method for synchronously loading the torque and bending moment of a wind turbine shaft system based on electro-hydraulic control is applied to the device for synchronously loading the torque and bending moment of a wind turbine shaft system based on electro-hydraulic control described in the first aspect, and specifically comprises the following steps:

[0014] S1: The controller starts the torque loading motor to rotate the shaft system, driving the torque loading pump to output pressure oil to the torque pressure control valve;

[0015] S2: The controller adjusts the torque load T of the shaft system in real time by adjusting the output pressure of the torque pressure control valve;

[0016] S3: When the torque load T of the shaft system stabilizes, the controller starts the moment loading motor to make the moment loading pump output pressure oil;

[0017] S4: The controller selects the left-end bending moment loading component or the right-end bending moment loading component to load the shaft system with a bending moment load W;

[0018] S5: When the left-end bending moment loading component is selected to load the shafting bending moment load W, the controller adjusts the shafting bending moment load W in real time by adjusting the working pressure of the left-end bending moment pressure control valve.

[0019] Furthermore, the calculation method of the torque load T in step S2 is:

[0020]

[0021] Where n is the speed of the torque loading motor, in r / min, Q is the output flow of the torque loading pump, in L / min, is the output efficiency of the torque loading pump, P is the output pressure of the torque pressure control valve, in MPa, and the torque load T is in Nm.

[0022] Furthermore, the calculation method of the bending moment load W in step S5 is:

[0023]

[0024] Where, is the working pressure of the left-end bending moment pressure control valve, in MPa, and A is the area of ​​the piston of the left-end bending moment pressure control valve, in m 2 , S is the area of ​​the piston rod of the left-end bending moment pressure control valve, unit is m 2 , L is the length of the shaft in m, and the unit of the bending moment load W is Nm.

[0025] The present invention has the following beneficial effects: a device and method for synchronous torque and bending moment loading of a wind turbine shaft system based on electro-hydraulic control of the present invention, while realizing torque loading of the wind turbine shaft system by electro-hydraulic means, adopts an independent electro-hydraulic loading system to perform bending moment loading on the shaft system. The torque load and bending moment load are generated by independent power sources, the working process is stable and reliable, and will not interfere with each other; the bending moment loading is generated by applying radial force on the end of the shaft system by the bending moment loading component, which can realize the application of large-value bending moment load; the torque load is changed by adjusting the working pressure of the control valve by the controller, and the bending moment load is changed by adjusting the bending moment loading component by the controller. The present invention can simultaneously load torque load and bending moment load for the dynamic performance test research of the wind turbine shaft system.

[0026] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 The present invention is a schematic structural diagram of a wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to a preferred embodiment of the present invention.

[0029] The numbers in the figure represent:

[0030] 1. Torque loading motor; 2. First coupling; 3. Shafting; 31. Left-end loading bearing; 32. Shaft; 33. Right-end loading bearing; 4. Second coupling; 5. Torque loading pump; 6. Torque pressure control valve; 7. Right-end bending moment loading assembly; 71. Right-end bending moment pressure control valve; 72. Right-end reversing control valve; 73. Right-end loading cylinder; 8. Left-end bending moment loading assembly; 81. Left-end bending moment pressure control valve; 82. Left-end reversing control valve; 83. Left-end loading cylinder; 9. Bending moment loading pump; 10. Third coupling; 11. Bending moment loading motor; 12. Controller. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0032] In addition, unless otherwise defined, the technical or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The words "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inside," and "outside" used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. Therefore, they should not be understood as limitations on this application. The words "first," "second," "third," and similar terms used in the description of this application are used only for descriptive purposes to distinguish different components and should not be understood to indicate or imply relative importance. The words "one," "an," or "the" used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as meaning the presence of at least one. The words "include" or "comprises" and similar terms used in the description of this application mean that the element or object preceding the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0033] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0034] Example 1, a wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control.

[0035] like Figure 1 As shown, the wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control of this embodiment includes: a torque loading motor 1, a shaft system 3, a torque loading pump 5, a torque pressure control valve 6, a bending moment loading assembly, a bending moment loading pump 9, a bending moment loading motor 11 and a controller 12. The rotating shaft of the torque loading motor 1 is connected to the first end of the shaft system 3, the second end of the shaft system 3 is connected to the input end of the torque loading pump 5, the output port of the torque loading pump 5 is connected to the input end of the torque pressure control valve 6, the rotating shaft of the bending moment loading motor 11 is connected to the input end of the bending moment loading pump 9, the output end of the bending moment loading pump 9 is connected to the input end of the bending moment loading assembly, and the output end of the bending moment loading assembly is connected to the end of the shaft system 3. The torque loading motor 1, the torque pressure control valve 6, the bending moment loading assembly and the bending moment loading motor 11 are all electrically connected to the controller 12.

[0036] Among them, the start and stop of the torque loading motor 1 is controlled by the controller 12. The torque loading motor 1 in this embodiment is an ordinary motor with a fixed speed. In other embodiments, different types of torque loading motors 1, such as servo motors, can be selected so that the controller 12 can control the speed of the torque loading motor 1; the first end and the second end of the shaft system 3 can be regarded as the left end and the right end in the spatial sense, respectively. Of course, in other embodiments, the first end of the shaft system 3 can also be regarded as the right end and the second end as the left end. When the torque loading motor 1 rotates, the rotating shaft drives the shaft system 3 to rotate, thereby loading the torque load T on the shaft system 3. The right end of the shaft system 3 is connected to the torque loading pump 5. When the shaft system 3 rotates, it can drive the torque loading pump 5 to output pressure oil to the torque pressure control valve 6. The output pressure of the torque pressure control valve 6 is adjusted by the controller 12.

[0037] The start and stop of the moment loading motor 11 is also controlled by the controller 12. The moment loading motor 11 in this embodiment is an ordinary motor with a fixed speed, just like the torque loading motor 1. The moment loading motor 11 can drive the moment loading pump 9 to output pressure oil to the moment loading component, so that the moment loading component loads the moment load W to the shaft system 3. The controller 12 controls the output pressure of the moment loading component and thus controls the magnitude of the moment load W of the shaft system 3.

[0038] The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control in this embodiment also includes a first coupling 2, a second coupling 4 and a third coupling 10. The torque loading motor 1 is connected to the first end of the shaft system 3 through the first coupling 2, the second end of the shaft system 3 is connected to the input end of the torque loading pump 5 through the second coupling 4, and the rotating shaft of the bending moment loading motor 11 is connected to the input end of the bending moment loading pump 9 through the third coupling 10. The coupling can make the connection of the rotating shaft more stable, and at the same time can protect the torque loading motor 1, the shaft system 3, the torque loading pump 5, the rotating shaft of the bending moment loading motor 11 and the bending moment loading pump 9.

[0039] In this embodiment, the wind turbine shaft system torque and bending moment synchronous loading device based on electro-hydraulic control, the shaft system 3 includes a left-end loading bearing 31, a shaft 32, and a right-end loading bearing 33. The left-end loading bearing 31 is installed at the first end of the shaft 32, and the right-end loading bearing 33 is installed at the second end of the shaft 32.

[0040] Among them, the inner ring of the left end loading bearing 31 is fixedly connected to the first end of the shaft 32, the inner ring of the right end loading bearing 33 is fixedly connected to the second end of the shaft 32, and the outer ring of the left end loading bearing 31 and the outer ring of the right end loading bearing 33 are connected to the bending moment loading assembly.

[0041] In this embodiment, the torque and bending moment synchronous loading device of the wind turbine shaft system based on electro-hydraulic control, the bending moment loading component includes a left-end bending moment loading component 8 for loading the bending moment for the first end of the shaft system 3, and a right-end bending moment loading component 7 for loading the bending moment for the second end of the shaft system 3. The structures of the left-end bending moment loading component 8 and the right-end bending moment loading component 7 are the same.

[0042] In this embodiment, the controller 12 can, according to experimental requirements, select the right-end bending moment loading component 7 or the left-end bending moment loading component 8 to load the bending moment on the left or right end of the shaft system 3, or simultaneously select the right-end bending moment loading component 7 and the left-end bending moment loading component 8 to load the bending moment in the same direction at the left and right ends of the shaft system 3, or simultaneously select the right-end bending moment loading component 7 and the left-end bending moment loading component 8 to load the bending moment in opposite directions at the left and right ends of the shaft system 3; when the bending moment is loaded in opposite directions at the left and right ends of the shaft system 3, the connection position of the right-end bending moment loading component 7 and the shaft system 3 and the connection position of the left-end bending moment loading component 8 and the shaft system 3 are facing each other. By selecting the right-end bending moment loading component 7 or the left-end bending moment loading component 8 to load the left or right end of the shaft system 3 separately, the bending moment that can be generated is half of the bending moment loaded in the same direction at the left and right ends of the shaft system 3. Loading the bending moment in opposite directions at the left and right ends of the shaft system 3 can generate a larger bending moment, which is twice the bending moment loaded in the same direction at the left and right ends of the shaft system 3.

[0043] Specifically, in this embodiment, the right-end bending moment loading assembly 7 includes a right-end bending moment pressure control valve 71, a right-end reversing control valve 72 and a right-end loading cylinder 73. The oil inlet of the right-end reversing control valve 72 is connected to the output end of the bending moment loading pump 9, the oil outlet of the right-end reversing control valve 72 is connected to the oil inlet of the right-end loading cylinder 73, the return oil input port of the right-end reversing control valve 72 is connected to the return oil port of the right-end loading cylinder 73, the return oil output port of the right-end reversing control valve 72 is connected to the input port of the right-end bending moment pressure control valve 71, and the right-end bending moment pressure control valve 71 and the right-end reversing control valve 72 are both electrically connected to the controller 12.

[0044] The right-end loading cylinder 73 includes a piston, a piston rod and a cylinder body. The piston rod of the right-end loading cylinder 73 is connected to the second end of the shaft system 3, and the cylinder body of the right-end loading cylinder 73 is fixed to the ground. The structure and connection relationship of the left-end bending moment loading assembly 8 are the same as those of the right-end bending moment loading assembly 7, which will not be repeated here.

[0045] The controller 12 controls the working state of the right-end reversing control valve 72 to put the right-end reversing control valve 72 in an oil-in / oil-off state. When the right-end reversing control valve 72 is in the oil-in state, the right-end loading cylinder 73 is filled with oil, which increases the pressure on the piston rod of the right-end loading cylinder 73, thereby pushing the piston rod of the right-end loading cylinder 73 to apply a bending load W to the right-end loading bearing 33. The process of applying the bending load W to the left-end loading bearing 31 is the same as that of the right-end loading bearing 33. When the right-end reversing control valve 72 is in the oil-in state and the right-end loading cylinder 73 is filled with oil, the return oil of the right-end loading cylinder 73 flows through the right-end reversing control valve 72 to the right-end bending moment pressure control valve 71. The controller 12 can adjust the bending load W of the shaft system in real time by adjusting the working pressure of the right-end bending moment pressure control valve 71.

[0046] In the wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control of this embodiment, the right-end reversing control valve 72 and the left-end reversing control valve 82 are both in the neutral oil return state under normal circumstances, and will not apply pressure to the piston rods of the left-end loading cylinder 83 and the right-end loading cylinder 73.

[0047] The working principle of this embodiment is as follows:

[0048] (1) Torque loading process and principle of shaft system 3:

[0049] The controller 12 starts the torque loading motor 1, and the shaft system 3 generates rotational motion under the drive of the torque loading motor 1. The torque loading pump 5 outputs pressure oil under the drive of the shaft system 3. The controller 12 can adjust the torque load T of the shaft system 3 by adjusting the output pressure of the torque pressure control valve 6.

[0050] When the speed of the torque loading motor 1 is n, the unit is r / min, the output flow of the torque loading pump 5 is Q, the unit is L / min, and the output efficiency of the torque loading pump 5 is , the output pressure of the torque pressure control valve 6 is P, in MPa, then the torque load T on the shaft system 3 is

[0051] (1)

[0052] In formula (1), the unit of torque load T is Nm.

[0053] From formula (1), we can see that by changing the speed n of the loading motor, the output flow of the torque loading pump 5 is Q, and the output pressure of the torque pressure control valve 6 is P, the torque load of the shaft system 3 can be adjusted. Under normal circumstances, the output efficiency of the torque loading pump 5 is It can be regarded as a constant. When the speed n of the torque loading motor 1 and the output flow Q of the torque loading pump 5 are fixed, the torque load T can be adjusted by adjusting the output pressure P of the torque pressure control valve 6.

[0054] (2) Shaft system 3 bending moment loading process and principle:

[0055] The following is an example of applying a bending moment load W to the left end of the shaft system 3.

[0056] Step 1: The controller 12 starts the torque loading motor 1. The shaft system 3 generates a rotational motion driven by the torque loading motor 1. The torque loading pump 5 outputs pressure oil under the drive of the shaft system 3. The controller 12 adjusts the output pressure of the torque pressure control valve 6 to 0. At this time, although the shaft system 3 is in a rotating state, the torque load T is 0.

[0057] Step 2: The controller 12 starts the moment loading motor 11. The moment loading pump 9 outputs pressure oil under the drive of the moment loading motor 11. The controller 12 adjusts the working pressure of the left-end moment pressure control valve 81. The controller 12 adjusts the working state of the left-end reversing control valve 82 to make it in the oil-intake state. Then, the left-end loading cylinder 83 applies the moment load W through the left-end loading bearing 31.

[0058] When the working pressure of the left end bending moment pressure control valve 81 , the unit is MPa, the area of ​​the piston is A, the unit is m 2 , the area of ​​the piston rod is S, the unit is m 2 , the length of shaft 32 is L, in meters, then the bending moment load W is:

[0059] L (2)

[0060] In formula (2), the unit of the bending moment load W is Nm.

[0061] From formula (2), we can know that the area of ​​the piston of the left bending moment pressure control valve 81 is A, the area of ​​the piston rod is S, and the length of the shaft 32 is L, which are all constants. The working pressure of the left bending moment pressure control valve 81 is adjusted as follows: The bending moment load W can be adjusted.

[0062] The process of applying bending moment load on the right end of shaft system 3 is similar to that on the left end.

[0063] (3) The process and principle of synchronous loading of torque and bending moment of shaft system 3:

[0064] The following is an example of applying a torque load T to the shaft system 3 and a bending moment load W to the left end at the same time.

[0065] The controller 12 starts the torque loading motor 1. Driven by the torque loading motor 1, the shaft system 3 generates a rotational motion. Driven by the torque loading motor 1, the torque loading pump 5 outputs pressure oil. The controller 12 can adjust the torque load of the shaft system 3 by adjusting the output pressure of the torque pressure control valve 6. The magnitude of the torque load T of the shaft system 3 is calculated according to formula (1).

[0066] When the torque load T of the shaft system 3 stabilizes, the controller 12 starts the bending moment loading motor 11. Driven by the bending moment loading motor 11, the bending moment loading pump 9 outputs pressurized oil. The controller 12 adjusts the operating pressure of the left-end bending moment pressure control valve 81. The controller 12 adjusts the operating state of the left-end reversing control valve 82 to put it in the oil-intake state. Then, the left-end loading cylinder 83 applies the bending moment load W through the left-end loading bearing 31. The magnitude of the bending moment load W of the shaft system 3 is calculated according to formula (2).

[0067] The present embodiment is a wind turbine shaft system torque and bending moment synchronous loading device based on electro-hydraulic control, in which a torque driving motor 1 is used to apply a torque load T, and a bending moment loading motor 11 is used to apply a bending moment load W. The torque load T is applied first, and then the bending moment load W is applied, thereby simultaneously loading the torque load T and the bending moment load W on the shaft system 3. The torque load T and the bending moment load W are generated by independent power sources, and the working process is stable and reliable without mutual interference.

[0068] Example 2: A method for synchronously loading the shaft torque and bending moment of a wind turbine generator system based on electro-hydraulic control.

[0069] The method for synchronously loading the shaft torque and bending moment of a wind turbine generator set based on electro-hydraulic control in this embodiment is applied to the device for synchronously loading the shaft torque and bending moment of a wind turbine generator set based on electro-hydraulic control described in Example 1, and specifically includes the following steps:

[0070] S1: The controller 12 starts the torque loading motor 1, causing the shaft system 3 to rotate, driving the torque loading pump 5 to output pressure oil to the torque pressure control valve 6;

[0071] S2: The controller 12 adjusts the torque load T of the shaft system 3 in real time by adjusting the output pressure of the torque pressure control valve 6;

[0072] S3: When the torque load T of the shaft system 3 stabilizes, the controller 12 starts the moment loading motor 11, causing the moment loading pump 9 to output pressure oil;

[0073] S4: The controller 12 selects the left-end bending moment loading assembly 8 or the right-end bending moment loading assembly 7 to load the shaft system 3 with a bending moment load W;

[0074] S5: When the left-end bending moment loading assembly 8 is selected to load the bending moment load W on the shaft system 3, the controller 12 adjusts the bending moment load W of the shaft system 3 in real time by adjusting the working pressure of the left-end bending moment pressure control valve 81.

[0075] The calculation method of the torque load T in step S2 is:

[0076] (3)

[0077] In formula (3), n is the speed of the torque loading motor, in r / min, Q is the output flow of the torque loading pump, in L / min, is the output efficiency of the torque loading pump, P is the output pressure of the torque pressure control valve, in MPa, and the torque load T is in Nm.

[0078] In this embodiment, the calculation method of the bending moment load W in step S5 is:

[0079] (4)

[0080] In formula (4), is the working pressure of the left-end bending moment pressure control valve, in MPa, A is the area of ​​the piston of the left-end bending moment pressure control valve, in m 2 , S is the area of ​​the piston rod of the left-end bending moment pressure control valve, unit is m 2 , L is the length of the shaft in m, and the unit of the bending moment load W is Nm.

[0081] The method for synchronously loading the wind turbine shaft system torque and bending moment based on electro-hydraulic control in this embodiment is applied to the synchronously loading device for the wind turbine shaft system torque and bending moment based on electro-hydraulic control described in Example 1. It can simultaneously load the torque load T and the bending moment load W on the shaft system 3, and the torque load T and the bending moment load W are generated by independent power sources. The working process is stable and reliable and will not interfere with each other.

[0082] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control, characterized in that: include: A torque loading motor (1), a shaft system (3), a torque loading pump (5), a torque pressure control valve (6), a bending moment loading assembly, a bending moment loading pump (9), a bending moment loading motor (11) and a controller (12), wherein the rotating shaft of the torque loading motor (1) is connected to the first end of the shaft system (3), the second end of the shaft system (3) is connected to the input end of the torque loading pump (5), the output port of the torque loading pump (5) is connected to the input end of the torque pressure control valve (6), the rotating shaft of the bending moment loading motor (11) is connected to the input end of the bending moment loading pump (9), the output end of the bending moment loading pump (9) is connected to the input end of the bending moment loading assembly, the output end of the bending moment loading assembly is connected to the end of the shaft system (3), and the torque loading motor (1), the torque pressure control valve (6), the bending moment loading assembly and the bending moment loading motor (11) are all electrically connected to the controller (12); The bending moment loading assembly comprises a left-end bending moment loading assembly (8) for loading a bending moment on a first end of the shaft system (3), and a right-end bending moment loading assembly (7) for loading a bending moment on a second end of the shaft system (3), wherein the left-end bending moment loading assembly (8) and the right-end bending moment loading assembly (7) have the same structure; The right-end bending moment loading assembly (7) comprises a right-end bending moment pressure control valve (71), a right-end reversing control valve (72) and a right-end loading oil cylinder (73); the oil inlet of the right-end reversing control valve (72) is connected to the output end of the bending moment loading pump (9); the oil outlet of the right-end reversing control valve (72) is connected to the oil inlet of the right-end loading oil cylinder (73); the return oil input port of the right-end reversing control valve (72) is connected to the return oil port of the right-end loading oil cylinder (73); the return oil output port of the right-end reversing control valve (72) is connected to the input port of the right-end bending moment pressure control valve (71); and the right-end bending moment pressure control valve (71) and the right-end reversing control valve (72) are both electrically connected to the controller (12).

2. The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to claim 1 is characterized in that: The shaft system (3) comprises a left-end loading bearing (31), a shaft (32) and a right-end loading bearing (33), wherein the left-end loading bearing (31) is mounted on a first end of the shaft (32), and the right-end loading bearing (33) is mounted on a second end of the shaft (32).

3. The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to claim 1 is characterized in that: The invention also includes a first coupling (2), a second coupling (4) and a third coupling (10), wherein the torque loading motor (1) is connected to the first end of the shaft system (3) through the first coupling (2), the second end of the shaft system (3) is connected to the input end of the torque loading pump (5) through the second coupling (4), and the rotating shaft of the bending moment loading motor (11) is connected to the input end of the bending moment loading pump (9) through the third coupling (10).

4. The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to claim 1 is characterized in that: The right-end bending moment loading assembly (7) and the left-end bending moment loading assembly (8) can independently load bending moments on the shaft system (3), or can simultaneously load bending moments on the shaft system (3) in opposite directions or in the same direction.

5. The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to claim 1, characterized in that: The right end loading cylinder (73) comprises a piston rod and a cylinder body, the piston rod of the right end loading cylinder (73) is connected to the second end of the shaft system (3), and the cylinder body of the right end loading cylinder (73) is fixedly connected to the ground.

6. The wind turbine shaft torque and bending moment synchronous loading device based on electro-hydraulic control according to claim 1, characterized in that: The right end reversing control valve (72) and the left end reversing control valve (82) are both in a neutral oil return state in normal conditions.

7. A method for synchronous torque and bending moment loading of a wind turbine shaft system based on electro-hydraulic control, characterized in that: The method for synchronously loading the shaft torque and bending moment of a wind turbine generator set based on electro-hydraulic control is applied to the device for synchronously loading the shaft torque and bending moment of a wind turbine generator set based on electro-hydraulic control according to any one of claims 1 to 6, and specifically comprises the following steps: S1: The controller (12) starts the torque loading motor (1), causing the shaft system (3) to rotate, driving the torque loading pump (5) to output pressure oil to the torque pressure control valve (6); S2: The controller (12) adjusts the torque load T of the shaft system (3) in real time by adjusting the output pressure of the torque pressure control valve (6); S3: When the torque load T of the shaft system (3) is stabilized, the controller (12) starts the moment loading motor (11) to make the moment loading pump (9) output pressure oil; S4: The controller (12) selects the left-end bending moment loading component (8) or the right-end bending moment loading component (7) to load the bending moment load W on the shaft system (3); S5: When the left-end bending moment loading assembly (8) is selected to load the bending moment load W on the shaft system (3), the controller (12) adjusts the bending moment load W of the shaft system (3) in real time by adjusting the working pressure of the left-end bending moment pressure control valve (81).

8. The method for synchronous torque and bending moment loading of a wind turbine shaft system based on electro-hydraulic control according to claim 7, characterized in that: The calculation method of the torque load T in step S2 is: Wherein, n is the speed of the torque loading motor (1), unit is r / min, Q is the output flow of the torque loading pump (5), unit is L / min, η is the output efficiency of the torque loading pump (5), P is the output pressure of the torque pressure control valve (6), unit is MPa, and the torque load T is Nm.

9. The method for synchronous torque and bending moment loading of a wind turbine shaft system based on electro-hydraulic control according to claim 7, characterized in that: The calculation method of the bending moment load W in step S5 is: W=pl(AS)L Wherein, pl is the working pressure of the left-end bending moment pressure control valve (81), in MPa, A is the area of ​​the piston of the left-end bending moment pressure control valve (81), in m2, S is the area of ​​the piston rod of the left-end bending moment pressure control valve (81), in m2, L is the length of the shaft (32), in m, and the unit of the bending moment load W is Nm.

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