Torque detection device and method

Abstract

The application discloses a kind of torque detection device and method, including support plate piece, displacement sensor and bottom plate, the bottom plate is fixedly installed below generator set, the support plate piece is detachably installed in the upper end surface of bottom plate, the displacement sensor is set in the upper end surface of bottom plate and located the side of support plate piece, the displacement sensor is connected between motor shaft by transmission assembly.This application has that generator set can be carried out skidding torque detection and calibration in the off-line state in service, without removing high-speed shaft coupling and torque limiter etc.;And also can be operated and maintained on-line and detect etc. Advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of torque detection device of wind turbine generator unit, and particularly relates to a torque detection device and method. BACKGROUND

[0002] The wind power coupling is a mechanical part used for connecting the high-speed shaft of the gear box and the motor shaft. The wind power coupling plays the roles of transmitting torque, buffering, damping, insulation, overload protection and improving the dynamic performance of the shaft system. When the torque transmitted in the wind turbine transmission chain exceeds the rated torque of the torque limiter, the torque limiter will slip, and the whole wind turbine transmission chain is effectively protected from overload. However, due to the machining error, the torque limiter has a certain difference from the set rated torque, so it is necessary to regularly test the performance of the wind power coupling in terms of the slip torque.

[0003] However, since the wind turbine generator is usually installed in the plateau, mountain or ocean where there is little population, it is inconvenient to maintain and operate, especially the high-speed shaft coupling. If it is necessary to determine whether the high-speed shaft coupling meets the use requirements, the high-speed shaft coupling needs to be removed and transported back to the laboratory to detect and calibrate the slip torque value on the large torque test bench, which is extremely inconvenient.

[0004] On the other hand, the existing detection device cannot detect and calibrate the torque limiter in the service off-line state. SUMMARY

[0005] The present application aims to provide a torque detection device and method, which can detect and calibrate the slip torque value in the service off-line state without removing the high-speed shaft coupling and the torque limiter, and can also detect online.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a torque detection device comprises a support plate, a displacement sensor and a bottom plate, the bottom plate is fixedly installed below the generator unit, the support plate is detachably installed on the upper end surface of the bottom plate, the displacement sensor is arranged on the upper end surface of the bottom plate and located on the side surface of the support plate, and the displacement sensor is connected with the motor shaft through a transmission assembly.

[0007] Preferably, a first threaded hole is formed in the bottom of the support plate, and the support plate is connected with the bottom plate by means of bolt connection.

[0008] Preferably, the transmission assembly is a transmission connecting rod, one end of the transmission connecting rod is rotatably connected with the displacement sensor, and the other end is detachably connected with the motor shaft.

[0009] Preferably, the transmission connecting rod comprises a connecting section and a clamp section, one end of the connecting section is rotatably connected with the displacement sensor, and the other end is provided with a connecting groove for connecting with the clamp section.

[0010] Preferably, the connecting groove and the hoop section are both provided with a second threaded hole.

[0011] Preferably, the transmission assembly is a cam, the cam is connected with the motor shaft and coaxial with the motor shaft, and the convex edge of the cam is rotationally connected with the displacement sensor.

[0012] A torque detection method, comprising the following steps:

[0013] S1, closing the generator set, and making the high-speed shaft brake disc of the gearbox in the generator set in a self-locking state;

[0014] S2, disconnecting the motor shaft locking sleeve from the shaft coupling, so that the shaft coupling is in an in-service offline state;

[0015] S3, supporting and fixing the motor shaft through the support plate;

[0016] S4, reconnecting the shaft coupling with the bearing in the support plate, and connecting the bearing with the torque power supply hydraulic station through the elastic diaphragm group;

[0017] S5, starting the hydraulic station, so that the motor shaft rotates, and the torque is transmitted to the displacement sensor through the transmission assembly, the torque value is displayed in real time through the terminal connected to the displacement sensor, and the online detection of the torque is completed;

[0018] S6, after the detection is completed, the support plate and the transmission assembly are removed from the motor shaft.

[0019] Compared with the prior art, the advantages of the present application are that when detecting and calibrating the shaft coupling torque, the shaft coupling does not need to be removed from the wind turbine nacelle, the support plate and the displacement sensor can be used to detect and calibrate the slip torque value of the shaft coupling offline in service, and the shaft coupling does not need to be returned to the laboratory for detection, which greatly saves the detection and calibration time and cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a front view of the present application;

[0021] Figure 2 is a sectional view of the transmission assembly of the present application Figure 1 ;

[0022] Figure 3 is a sectional view of the transmission assembly of the present application Figure 2 ;

[0023] Figure 4 is a schematic view of the elastic diaphragm group of the present application;

[0024] Figure 5 is a flow chart of the method of the present application.

[0025] In the diagram: 1. Support plate; 2. Bearing; 3. Coupling; 4. First threaded connection hole; 5. Base plate; 6. Displacement sensor; 7. Transmission assembly; 8. Connecting section; 9. Clamping section; 10. Connecting groove; 11. Second threaded connection hole; 12. Cam; 13. Elastic rod. Detailed Implementation

[0026] The present invention will be further described below.

[0027] Example 1: As Figure 1 As shown, a torque detection device includes a support plate 1, a displacement sensor 6, and a base plate 5.

[0028] The base plate 5 is a thick steel plate fixedly installed below the generator set. The support plate 1 is installed on the upper surface of the base plate 5. The bottom of the support plate 1 has a first threaded connection hole 4 and is detachably installed on the upper surface of the base plate 5 by means of bolt connection. Preferably, the support plate 1 is fixed to the base plate 5 with a preload of 490 NM by bolts through the first threaded connection hole 4. The upper surface of the base plate 5 is also equipped with a displacement sensor 6 for detecting the torque of the coupling 3 on the generator set. The displacement sensor 6 is located on the side of the support plate 1.

[0029] Specifically, a bearing 2 for connecting the motor shaft is embedded in the middle of the support plate 1; the displacement sensor 6 is a linear displacement sensor, and the movement direction of the displacement sensor 6 is vertical; the moving end of the displacement sensor 6 is connected to a transmission assembly 7; for example... Figure 2 As shown, the transmission assembly 7 is preferably a transmission link, one end of which is rotatably connected to the displacement sensor 6, and the other end of which is sleeved on the motor shaft and fixedly connected to the motor shaft, as shown. Figure 2 As shown, in order to achieve a detachable connection between the transmission link and the motor shaft, the transmission link has a segmented structure, including a connecting section 8 and a clamping section 9. The connecting section 8 is a straight rod structure, and the clamping section 9 is a clamping structure. One end of the connecting section 8 is rotatably connected to one end of the displacement sensor 6, and the other end of the connecting section 8 is provided with a connecting groove 10. The connecting groove 10 is adapted to the clamping section 9, that is, one end of the clamping section 9 can be inserted into the connecting groove 10. At the same time, both the connecting groove 10 and the clamping section 9 are provided with second threaded connecting holes 11, that is, the connecting section 8 and the clamping section 9 are fixedly connected by bolts. Preferably, the clamping section 9 is fixed to the connecting section 8 with bolts through the second threaded connecting holes 11, and a preload is applied to the bolts until the clamping section is tightened.

[0030] Example 2: Figure 3As shown, the transmission assembly 7 is a cam 12, which is detachably connected with the motor shaft, that is, the cam 12 is coaxial with the motor shaft, and the protruding edge of the cam 12 is rotationally connected with the displacement sensor 6, and it is noted that the detection range of the displacement sensor 6 is 0-100,000 NM.

[0031] A torque detection method, comprising the following steps:

[0032] S1, stop the wind turbine generator, and make the high-speed shaft brake disc of the gearbox in the generator set in a brake self-locking state;

[0033] S2, disconnect the motor shaft locking sleeve from the shaft coupling, so that the shaft coupling is in an in-service offline state;

[0034] S3, support and fix the motor shaft through the support plate member;

[0035] S4, reconnect the shaft coupling with the bearing in the support plate member, and connect the shaft coupling with the hydraulic station providing torque power through the elastic diaphragm group;

[0036] S5, start the hydraulic station, give the shaft coupling a rotational inertia, the torque value is greater than the required slip torque value of the equipment, so that the torque limiter slips and rotates, and the displacement value is transmitted to the displacement sensor through the transmission assembly, the displacement value is converted into a torque value through the terminal connected to the displacement sensor, and the torque value is displayed in real time, completing the in-service offline detection of the torque; after the determination of the slip torque value, the slip torque value is accurately calibrated according to the requirements of the wind turbine generator, and the torque wrench is used to tighten or loosen according to the instruction manual, and after replacing the butterfly gasket, the slip torque value required by the wind turbine generator is reached.

[0037] S6, after the detection and calibration are completed, the support plate member and the transmission assembly are removed from the motor shaft.

[0038] Working principle:

[0039] When performing online torque detection on a wind turbine generator set, the coupling 3 is first placed in a semi-disassembled state, with one end of the coupling 3 fixedly connected to the high-speed shaft of the gearbox and the other end separated from the motor shaft. Then, the motor shaft is inserted into the bearing 2 in the middle of the support plate 1, and the support plate 1 is fixedly connected to the base plate 5 through the first threaded connection hole 4. Next, one end of the transmission assembly 7 is fixedly connected to the motor shaft. Then, the motor shaft is reconnected to the coupling 3. At this point, torque power can be provided to the motor shaft by connecting an external hydraulic station from the wind turbine generator set to the side of the motor shaft. Simultaneously, the gearbox is in a self-locking state, meaning the high-speed shaft of the gearbox is fixed and does not rotate. The motor shaft begins to rotate under the action of torque force, and the rotation is transmitted to the displacement sensor 6 through the transmission assembly. The magnitude of the torque force is displayed in real time through a micro mobile terminal connected to the displacement sensor 6, such as a mobile phone or a data acquisition controller using 485 communication, thus completing the online detection. After the detection is completed, the support plate 1 and the transmission assembly 7 can be removed.

[0040] In another embodiment, such as Figure 4 As shown, the motor shaft and coupling 3 are connected by an elastic diaphragm assembly. The elastic diaphragm assembly is a ring-shaped structure formed by several elastic rods 13 connected together. That is, the end of each elastic rod 13 is connected to the end of another elastic rod 13 by bolts. The multiple elastic rods 13 are finally wrapped around to form a ring. In this embodiment, the elastic rods 13 are preferably four, and the four elastic rods 13 are connected to form a rectangular ring structure. The bolts used to connect the four elastic rods 13 to each other can also connect the elastic diaphragm assembly to the torque limiter. The bolts are tightened by a preload wrench so that the bolts have a certain preload force. When testing the slippage torque value of the torque limiter, part of the torque force on the torque limiter is transmitted to the elastic rods 13 and part of it is transmitted to the bolts on the elastic diaphragm assembly, so that the bolts bear a certain force. When the torque reaches the slippage torque value, the torque limiter will slip. At the same time, the bolts are subjected to a torque force exceeding the maximum preload force they can bear. Therefore, there is a certain proportional relationship between the preload force on the bolts and the slippage torque of the torque limiter. The values ​​are shown in Table 1.

[0041] Table 1. Values ​​of Bolt Preload and Torque Limiter Slippage Torque

[0042]

[0043]

[0044] The bolt is also connected with an ultrasonic bolt pre-tightening force on-line detection device, through which the pre-tightening force of the bolt can be detected and transmitted to the terminal display, converted into the torque force size that the torque limiter receives, and then the slipping torque is quickly and conveniently detected without disassembly. On the other hand, when the in-service off-line state monitoring is performed, the torque force size detected by the ultrasonic bolt pre-tightening force on-line detection device can be combined with the torque size detected by the displacement sensor 6 on-line, so as to improve the accuracy of torque value detection.

[0045] The principles and implementation manners of the present application are described by applying specific examples in the present text, and the above description of the examples is only used to help understand the method of the present application and its core idea; meanwhile, according to the idea of the present application, the specific implementation manners and application ranges will be changed by the general technical personnel in the field, and the changes and improvements of the present application will be possible without exceeding the concept and range defined by the appended claims, and the content of the present description should not be understood as the limitation of the present application.

Claims

1. A method for online torque detection, characterized in that: The method comprises the following steps: S1, closing the generator set, and making the high-speed shaft brake disc of the gearbox in the generator set in a self-locking state; S2, disconnecting the motor shaft locking sleeve from the shaft coupling, so that the shaft coupling is in an offline state in service; S3, supporting and fixing the motor shaft through a support plate; S4, connecting the shaft coupling with the bearing in the support plate again, and connecting the bearing with a hydraulic station providing torque through an elastic diaphragm group; S5, starting the hydraulic station, so that the motor shaft rotates, and torque is transmitted to the displacement sensor through a transmission assembly, the torque value is displayed in real time through a terminal circumscribed on the displacement sensor, and online detection of torque is completed; S6, after detection is completed, the support plate and the transmission assembly are removed from the motor shaft; The device for detecting torque online comprises the support plate, the displacement sensor, and a bottom plate, the bottom plate is fixedly installed below the generator set, the support plate is detachably installed on the upper end face of the bottom plate, the displacement sensor is arranged on the upper end face of the bottom plate and located on the side of the support plate, and the displacement sensor and the motor shaft are connected through the transmission assembly.

2. The method of claim 1, wherein: The bottom of the support plate is provided with a first threaded hole, and the support plate is connected with the bottom plate in a bolt connection mode.

3. The method of claim 2, wherein: The transmission assembly is a transmission link, one end of the transmission link is rotatably connected with the displacement sensor, and the other end is detachably connected with the motor shaft.

4. The method of claim 3, wherein: The transmission link comprises a connecting section and a clamp section, one end of the connecting section is rotatably connected with the displacement sensor, and the other end is provided with a connecting groove for connecting the clamp section.

5. The method of claim 4, wherein: Second threaded holes are formed in the connecting groove and the clamp section.

6. The method of claim 5, wherein: The transmission assembly is a cam, the cam is connected with the motor shaft and coaxial with the motor shaft, and the convex edge of the cam is rotatably connected with the displacement sensor.

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