A wind turbine transmission chain replacement structure and replacement method without lowering the wind wheel from the tower

Abstract

The present invention provides a wind turbine transmission chain replacement structure and replacement method without lowering the wind rotor from the tower. The structure includes a frame structure, a threaded sleeve and a screw arranged on a main frame. The frame structure is perpendicular to the axis of the transmission chain. A flange is arranged on the frame structure. The inner diameter of the flange is larger than the outer circumference of the flange connected to the hub on the main shaft. A plurality of first threaded holes are arranged on the distribution circle of the flange. A through hole is arranged at the center of the threaded sleeve. The threaded sleeve is screwed into the first threaded hole and abuts against the hub. The screw passes through the threaded sleeve and is screwed into the second threaded hole to fix the hub to the main frame. The method and design structure adopted by the present invention can realize the replacement of the transmission chain as a whole or related parts without lowering the wind rotor from the tower at a very low cost. The threaded sleeve, pin and other parts used to implement the method are used as tools. Only one set or one set for one wind farm is required. The method involved is delicate, the structure is easy to implement, and the operation is convenient, which can significantly reduce the operation and maintenance costs.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind turbine transmission chain replacement structure and a replacement method thereof without lowering a wind wheel from a tower. Background Art

[0002] In a wind turbine generator set, the transmission chain is a very important component, playing a key role in transferring the mechanical energy converted from wind energy to the power generation system. The maintainability of the transmission chain and its maintenance cost have an important impact on the life cycle cost of the unit. Damage to the main bearings of traditional direct-drive, high-speed double-fed, and high-speed permanent magnet units, as well as major failures of related components of the currently emerging medium-speed integrated transmission chain, will lead to the replacement of the transmission chain down the tower, and then the wind rotor down the tower. The cost of lowering the wind rotor and hoisting is very high. With the accelerated large-scale development of wind turbines, the cost of hoisting and maintenance has become increasingly prominent. If a wind farm has a wind rotor down the tower due to a transmission chain failure, its maintenance cost will increase significantly. Therefore, while improving the reliability of the unit, there is an urgent market demand and necessity for research on reducing the maintenance cost of the unit. Summary of the invention

[0003] In view of this, the problem to be solved by the present invention is to provide a wind turbine transmission chain replacement structure and a replacement method thereof without the wind rotor being lowered from the tower. The adopted method and design structure can realize the replacement of the entire transmission chain or related components without the wind rotor being lowered from the tower at an extremely low cost, and the threaded sleeves, pins and other parts used to implement the method are used as tools, and only one set needs to be prepared or one set needs to be prepared for one wind farm, and they can be reused. The method involved is sophisticated, the structure is easy to implement, and the operation is convenient, which can significantly reduce the operation and maintenance costs.

[0004] The present invention solves the above technical problems through the following technical means: The present invention provides a wind turbine transmission chain replacement structure without lowering the wind wheel from the tower, comprising a frame structure, a threaded sleeve and a screw arranged on a main frame, the frame structure being perpendicular to the axis of the transmission chain, a flange plate being arranged on the frame structure, the inner hole diameter of the flange plate being larger than the outer circumferential surface of a connecting flange on the main shaft connected to the hub, a plurality of first threaded holes being arranged on a distribution circle of the flange plate, a thread matching the first threaded holes being arranged on the outer circumferential surface of the threaded sleeve, a through hole being arranged at the center of the threaded sleeve, the threaded sleeve being screwed into the first threaded hole and abutting against the hub, a second threaded hole corresponding to the first threaded hole being arranged on the hub, the screw passing through the threaded sleeve and being screwed into the second threaded hole to fix the hub to the main frame, a pad being arranged between the screw and the flange plate, the size of the pad being larger than the outer circumferential diameter of the threaded sleeve.

[0005] Furthermore, a pin hole is provided on the distribution circle of the flange, and a pin shaft can be inserted into the pin hole. One end of the pin shaft is set as a cylindrical surface and the other end is set as a conical surface. One end of the cylindrical surface of the pin shaft cooperates with the pin hole on the main frame flange, and the conical surface of the pin shaft cooperates with the conical hole on the flange of the hub. After the pin shaft is inserted into the pin hole and the conical hole, the cylindrical end of the pin shaft is higher than the end face of the flange.

[0006] Furthermore, a pressure plate is provided on the main frame, one end of the pressure plate abuts against the end surface of the cylindrical end of the pin shaft, and the pressure plate is fastened to the main frame by bolts.

[0007] Furthermore, a third threaded hole is arranged at the center of the pin shaft along its axis.

[0008] Furthermore, the first threaded holes are arranged in an array on the flange along the central circumference of the flange.

[0009] Furthermore, the pin holes are provided in plurality, and the plurality of pin holes are arranged along the circumference of the flange.

[0010] Furthermore, the pad is made of high-strength steel.

[0011] Furthermore, the threaded sleeve is provided with a hexagonal hole at one end close to the backing plate, and the hexagonal hole is coaxially arranged with the through hole.

[0012] The present invention also provides a method for replacing a transmission chain of a wind turbine set without lowering the wind wheel from the tower, comprising the following steps:

[0013] S1. First, rotate the wind wheel to center and locate the pin hole, apply grease on the conical surface of the pin hole, then insert the pin shaft into the pin hole and install the pressure plate;

[0014] S2. Screw the threaded sleeve into the main frame, and use the hexagonal socket of the threaded sleeve to tighten the threaded sleeve with a certain torque and hold it against the hub flange surface;

[0015] S3, then pass the bolt through the through hole in the threaded sleeve to connect the wheel hub to the main frame;

[0016] S4. Tighten the pressure plate with the bolts at a preset torque;

[0017] S5. Remove the connecting bolts between the main shaft and the wheel hub, and then lift down the relevant parts of the transmission chain for replacement;

[0018] S6. After the replacement is completed, the connection and installation of the hub and the main shaft are completed by the reverse operation process;

[0019] S7. After completing the connection and installation of the wheel hub and the main shaft, remove the threaded sleeve, screw and pin. After the removal of the threaded sleeve, screw and pin, check the connecting bolts of the wheel hub and the main shaft with the specified tightening torque to ensure that they reach the specified torque.

[0020] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: the present invention provides a wind turbine transmission chain replacement structure without lowering the wind wheel from the tower, comprising a frame structure, a threaded sleeve and a screw arranged on a main frame, the frame structure being perpendicular to the axis of the transmission chain, a flange plate being arranged on the frame structure, the inner hole diameter of the flange plate being larger than the outer circumferential surface of a connecting flange on the main shaft connected to the hub, a plurality of first threaded holes being arranged on a distribution circle of the flange plate, a thread matching the first threaded holes being arranged on the outer circumferential surface of the threaded sleeve, a through hole being arranged at the center of the threaded sleeve, the threaded sleeve being screwed into the first threaded hole and abutting against the hub, a second threaded hole corresponding to the first threaded hole being arranged on the hub, the screw passing through the threaded sleeve and being screwed into the second threaded hole to fix the hub to the main frame, a pad being arranged between the screw and the flange plate, the size of the pad being larger than the outer circumferential diameter of the threaded sleeve. The method and design structure adopted by the present invention can realize the replacement of the entire transmission chain or related parts without lowering the wind wheel from the tower at an extremely low cost, and the threaded sleeves, pins and other parts used to implement the method are used as tools, and only one set needs to be prepared or one set is prepared for one wind farm, and they can be reused. The method involved is sophisticated, the structure is easy to implement, and the operation is convenient, which can significantly reduce the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a schematic diagram of a wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to the present invention;

[0023] Figure 2 A partial cross-sectional view of the screw position of the wind turbine drive chain replacement structure without lowering the wind rotor from the tower provided by the present invention;

[0024] Figure 3 A partial cross-sectional view of the pin position of the wind turbine transmission chain replacement structure without lowering the wind wheel from the tower provided by the present invention;

[0025] Figure markings: 1-main frame; 2-threaded sleeve; 3-screw; 11-flange; 4-main shaft; 5-hub; 41-connecting flange; 111-first threaded hole; 21-through hole; 31-pad; 12-pin hole; 13-pin shaft; 14-pressure plate; 15-bolt; 121-third threaded hole. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0027] See also Figures 1 to 3 As shown, the present invention provides a wind turbine transmission chain replacement structure without lowering the wind wheel from the tower, comprising a frame structure, a threaded sleeve 2 and a screw 3 arranged on a main frame 1, wherein the frame structure is perpendicular to the axis of the transmission chain, and the frame structure can be in an integral casting form or in a split connection form, wherein a flange 11 is arranged on the frame structure, wherein the inner hole diameter of the flange 11 is larger than the outer circumference of a connecting flange 41 on a main shaft 4 connected to a hub 5, and the inner hole of the flange surface is larger than the outer circumference of a flange on the main shaft 4 connected to the hub 5, so that the main shaft 4 passes through the inner hole of the main frame 1 and is disassembled or connected to the hub 5 when the transmission chain is replaced; a plurality of first Threaded hole 111, a thread matching the first threaded hole 111 is arranged on the outer circumferential surface of the threaded sleeve 2, a through hole 21 is arranged at the center of the threaded sleeve 2, the threaded sleeve 2 is screwed into the first threaded hole 111 and abuts against the hub 5, there is a certain safety distance between the corresponding flange surfaces of the hub 5 and the main frame 1 so that there is no interference during the normal operation of the fan, a second threaded hole corresponding to the first threaded hole 111 is arranged on the hub 5, the screw 3 passes through the threaded sleeve 2 and is screwed into the second threaded hole to fix the hub 5 to the main frame 1, a gasket 31 is arranged between the screw 3 and the flange 11, and the size of the gasket 31 is larger than the outer diameter of the threaded sleeve 2. The outer cylindrical surface of the threaded sleeve 2 is threaded, and the interior is a through hole 21 plus a hexagonal sleeve structure. The threaded sleeve 2 is screwed into the flange surface of the main frame 1 and supports the flange surface of the wheel hub 5, playing the role of adding a gasket between the wheel hub 5 and the main frame 1. It is used to eliminate the gap between the wheel hub 5 and the main frame 1 when replacing the transmission, and the wheel hub 5 is connected to the main frame 1 with bolts 15. The threaded sleeve 2 sinks below the flange surface of the main frame 1.

[0028] As a further improvement to the above technical solution, a pin hole 12 is also provided on the distribution circle of the flange 11, and a pin shaft 13 can be inserted into the pin hole 12. One end of the pin shaft 13 is set as a cylindrical surface and the other end is a conical surface. One end of the cylindrical surface of the pin shaft 13 matches with the pin hole 12 on the flange 11 of the main frame 1, and the conical surface of the pin shaft 13 matches with the conical hole on the flange of the wheel hub 5. After the pin shaft 13 is inserted into the pin hole 12 and the conical hole, the cylindrical end of the pin shaft 13 is higher than the end face of the flange 11. A high-strength pin is designed, with one end as a cylindrical surface and the other end as a conical surface. The cylindrical surface matches with the cylindrical hole on the flange of the main frame 1, and the conical surface matches with the conical hole on the flange of the wheel hub 5. The conical surface and the conical hole match each other, which is conducive to alignment and centering as well as the insertion and withdrawal of the pin. The cylindrical end of the pin is higher than the flange surface of the main frame 1, so that the pin can be pressed by a pressure plate 14 and the pin can be tightly matched with the conical hole of the wheel hub 5. There is a shorter threaded hole in the pin, which is used as a top screw hole to eject the pin from the wheel hub 5 when the pin is removed from the flange of the main frame 1. There is a longer through hole 21 in the pin, the purpose is to reduce time and improve efficiency when the pin is ejected with the top screw hole.

[0029] As a further improvement to the above technical solution, a pressure plate 14 is provided on the main frame 1 , one end of the pressure plate 14 abuts against the end surface of the cylindrical end of the pin shaft 13 , and the pressure plate 14 is fastened to the main frame 1 by bolts 15 .

[0030] As a further improvement to the above technical solution, the center of the pin shaft 13 is provided with a third threaded hole 121 along its axis. A shorter threaded hole is provided in the pin to serve as a top screw hole to push the pin out of the hub 5 when the pin is removed from the flange of the main frame 1.

[0031] As a further improvement to the above technical solution, the first threaded holes 111 are arranged in an array along the central circumference of the flange 11, and the uniform distribution allows the wind wheel to replace the transmission chain in more blade positions. There are multiple pin holes 12, and the multiple pin holes 12 are arranged along the circumference of the flange 11.

[0032] As a further improvement to the above technical solution, the pad 31 is made of high-strength steel. Since the mounting hole of the threaded sleeve 2 is larger than the through hole of the threaded sleeve, a special high-strength large pad 31 is used for the connection of the screw rod 3.

[0033] As a further improvement to the above technical solution, the threaded sleeve 2 is provided with a hexagonal hole at one end close to the backing plate 31, and the hexagonal hole is coaxially arranged with the through hole 21. It is used to tighten the threaded sleeve 2 against the flange end surface of the hub 5.

[0034] The present invention also provides a method for replacing a transmission chain of a wind turbine set without lowering the wind wheel from the tower, comprising the following steps:

[0035] S1. First, rotate the wind wheel to center and align the pin hole 12, apply grease on the conical surface of the pin hole 12, then insert the pin shaft 13 into the pin hole 12 and install the pressure plate 14;

[0036] S2, screw the threaded sleeve 2 into the main frame 1, and use the hexagonal socket of the threaded sleeve 2 to tighten the threaded sleeve 2 with a certain torque and support the flange surface of the wheel hub 5;

[0037] S3, then pass the bolt 15 through the through hole 21 in the threaded sleeve 2 to connect the wheel hub 5 to the main frame 1;

[0038] S4, tighten the pressing plate 14 with the bolt 15 at a preset torque;

[0039] S5, remove the connecting bolts between the main shaft 4 and the wheel hub 5, and then hang down the relevant parts of the transmission chain for replacement;

[0040] S6. After the replacement is completed, the connection and installation of the hub 5 and the main shaft 4 are completed by the reverse operation process;

[0041] S7. After completing the connection and installation of the wheel hub 5 and the main shaft 4, remove the threaded sleeve 2, the screw rod 3 and the pin 13. After the removal of the threaded sleeve 2, the screw rod 3 and the pin 13, check the connecting bolts between the wheel hub 5 and the main shaft 4 with the specified tightening torque to ensure that they reach the specified torque.

[0042] Specifically, before removing the transmission chain, first rotate the wind wheel to center and align the pin hole 12, apply grease to the conical surface of the pin to facilitate smoother removal of the pin later, and insert the pin into the pin hole 12 and use the pressure plate 14 to preliminarily position the pin. After the threaded sleeve 2 is screwed into the main frame 1, the threaded sleeve 2 is tightened with a certain torque using the inner hexagon of the threaded sleeve 2 and supported against the flange surface of the hub 5. The preload force of the connecting bolts between the hub 5 and the main shaft 4 minus the preload force of the threaded sleeve 2 should enable the connecting bolt connection between the hub 5 and the main shaft 4 to withstand the overall weight of the wind wheel and have a sufficient safety factor. Then use the bolt 15 to pass through the through hole 21 in the threaded sleeve 2 to connect the hub 5 to the main frame 1. Tighten the pressure plate bolts of the pin with a certain torque. The screw 3 and the pin connecting the hub 5 to the main frame 1 should be able to withstand the overall weight of the wind wheel and have a sufficient safety factor; remove the connecting bolts between the main shaft 4 and the hub 5, and hang down the transmission chain or related components for replacement. After replacing the transmission chain, the removal of the threaded sleeve 2, pins and other connecting parts is the opposite of the above operation process, and finally the connecting bolts between the hub 5 and the main shaft 4 are checked again with the specified tightening torque. The method and design structure adopted by the present invention can replace the entire transmission chain or related parts without removing the wind wheel from the tower at a very low cost, and the threaded sleeve 2, pins and other parts used to implement the method are used as tools, and only one set or one set is prepared for one wind farm, which can be reused. The method involved is delicate, the structure is easy to implement, and the operation is convenient, which can significantly reduce the operation and maintenance costs.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wind turbine transmission chain replacement structure without lowering the wind rotor from the tower, characterized in that: The invention comprises a frame structure, a threaded sleeve and a screw arranged on a main frame, wherein the frame structure is perpendicular to the axis of the transmission chain, a flange is arranged on the frame structure, the inner hole diameter of the flange is larger than the outer circumference of a connecting flange connected to the hub on the main shaft, a plurality of first threaded holes are arranged on the distribution circle of the flange, a thread matching the first threaded hole is arranged on the outer circumference of the threaded sleeve, a through hole is arranged at the center of the threaded sleeve, the threaded sleeve is screwed into the first threaded hole and abuts against the hub, a second threaded hole corresponding to the first threaded hole is arranged on the hub, and the The screw passes through the threaded sleeve and is screwed into the second threaded hole to fix the wheel hub to the main frame. A pad is arranged between the screw and the flange. The size of the pad is larger than the outer diameter of the threaded sleeve. A pin hole is also arranged on the distribution circle of the flange. A pin shaft can be inserted into the pin hole. One end of the pin shaft is set as a cylindrical surface and the other end is set as a conical surface. One end of the cylindrical surface of the pin shaft cooperates with the pin hole on the flange of the main frame, and the conical surface of the pin shaft cooperates with the conical hole on the flange of the wheel hub. After the pin shaft is inserted into the pin hole and the conical hole, the cylindrical end of the pin shaft is higher than the end face of the flange.

2. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 1 is characterized in that: A pressure plate is arranged on the main frame, one end of the pressure plate abuts against the end surface of the cylindrical end of the pin shaft, and the pressure plate is fastened to the main frame by bolts.

3. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 2 is characterized in that: The center of the pin shaft is provided with a third threaded hole along its axis.

4. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 2 is characterized in that: The first threaded holes are arranged in an array on the flange along the central circumference of the flange.

5. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 2 is characterized in that: There are multiple pin holes, and the multiple pin holes are arranged along the circumference of the flange.

6. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 2 is characterized in that: The backing plate is made of high-strength steel.

7. The wind turbine transmission chain replacement structure without lowering the wind wheel from the tower according to claim 2 is characterized in that: The threaded sleeve is provided with a hexagonal hole at one end close to the backing plate, and the hexagonal hole is coaxially arranged with the through hole.

8. A method for replacing a transmission chain of a wind turbine generator system without lowering the wind turbine from the tower based on the wind turbine drive chain replacement structure of any one of claims 2 to 7, characterized in that: The steps include: S1. First, rotate the wind wheel to center and locate the pin hole, apply grease on the conical surface of the pin hole, then insert the pin shaft into the pin hole and install the pressure plate; S2. Screw the threaded sleeve into the main frame, and use the inner hexagon of the threaded sleeve to tighten the threaded sleeve with a certain torque and hold it against the hub flange surface; S3, then pass the bolt through the through hole in the threaded sleeve to connect the wheel hub to the main frame; S4. Tighten the pressure plate with bolts at a preset torque; S5. Remove the connecting bolts between the main shaft and the wheel hub, and then lift down the relevant parts of the transmission chain for replacement; S6. After the replacement is completed, the connection and installation of the hub and the main shaft are completed by the reverse operation process; S7. After completing the connection and installation between the hub and the main shaft, remove the threaded sleeve, screw and pin.

9. The transmission chain replacement method according to claim 8, characterized in that: Step S7 also includes checking the connecting bolts between the hub and the main shaft with a specified tightening torque after the threaded sleeve, the screw and the pin are removed.

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