A monitoring device and correction method for the alignment of a wind turbine shaft

Abstract

The present invention provides a monitoring device and correction method for the alignment of a wind turbine shaft. The device includes a position measurement device, a processing unit, and a host computer. Test points are evenly arranged on the generator mounting base, and position measurement devices for respectively measuring the lateral, longitudinal, and height positions are provided at each test point. The processing unit is used to collect the initial position data and real-time position data of the generator shaft, calculate the deviation between the real-time position data and the initial position data, and determine whether the alignment error between the generator shaft and the high-speed shaft of the gearbox exceeds a safety threshold according to the deviation. The host computer is used to receive, store, and display the initial position data, real-time position data, the deviation between the real-time position data and the initial position data, and the determination result transmitted by the processing unit. The device and method of the present invention have a simple structure, are easy to install, have little limitation on space requirements, are convenient for maintenance, have good interchangeability, high economic benefits, and simple alignment correction operations.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and particularly to a monitoring device and a correction method for the alignment of the shafts of a wind turbine. Background Art

[0002] With the continuous development of science and technology, the demand for energy is increasing nowadays, and wind power generation has become an important way to obtain energy. The transmission part of a wind turbine consists of a low-speed shaft, a high-speed shaft, a brake, a gearbox, and a coupling. Among them, the high-speed shaft of the gearbox is connected to the generator shaft through a coupling. During the normal operation of the generator, the misalignment of the two shafts between the generator shaft and the high-speed shaft of the gearbox usually occurs due to its own vibration. If the deviation between the two shafts exceeds the safety threshold, long-term operation will cause damage to the coupling or the bearing of the high-speed shaft. Therefore, it is necessary to monitor the alignment state of the motor shaft and the high-speed shaft of the gearbox in real time, and when the deviation between the two shafts exceeds the safety threshold, alignment correction is required.

[0003] Most of the existing monitoring systems directly monitor the alignment state by monitoring the axes of the generator and the gearbox, and the commonly used correction method is to adjust the height and position of the generator support base. There are four such support bases, which are located at the four corners of the generator mounting seat respectively. Since the sensors monitor the axes of the motor shaft and the high-speed shaft of the gearbox, while the adjustment is made to the four support bases, the adjustment amount and the monitored amount are inconsistent. Also, since there are various combinations of the height and position of the four support bases, on-site trial adjustment by the staff is required, which is highly dependent on the experience of the staff and the adjustment process is rather cumbersome. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a monitoring device and a correction method for the alignment of the shafts of a wind turbine, which have a simple structure, are easy to install, have little limitation on space requirements, are convenient for maintenance, have good interchangeability, high economic benefits, and simple alignment correction operation.

[0005] To solve the above technical problem, the technical solution proposed by the present invention is as follows:

[0006] A monitoring device for the alignment of a wind turbine shaft, comprising a position measuring device, a processing unit and a host computer. Among them, test points are evenly arranged on the generator mounting base, and position measuring devices for respectively measuring the lateral, longitudinal and height positions of each test point are provided at each test point. The processing unit is used to collect the initial position data and real-time position data of the generator shaft transmitted by the position measuring device, calculate the deviation between the real-time position data and the initial position data, and determine whether the alignment error between the generator shaft and the high-speed shaft of the gearbox exceeds the safety threshold according to the deviation. The host computer is used to receive, store and display the initial position data, real-time position data, the deviation between the real-time position data and the initial position data, and the determination result transmitted by the processing unit.

[0007] For the monitoring device for the alignment of a wind turbine shaft according to the present invention, the position measuring device is installed on the generator mounting base to monitor the position of the generator shaft in real time. Installation can be completed without disassembling the generator, so the structure is simple and installation is convenient. The lateral and longitudinal position measuring devices will not exceed the outer dimensions of the generator and have basically no requirements for height. The height position measuring device is installed on the generator mounting base and will not affect the normal installation of the generator, so the space limitation is small. Staff can easily obtain the real-time alignment status of the generator set shaft on the host computer, eliminating the need for staff to climb nearly 100 meters for maintenance. At the same time, it can avoid damage to the equipment caused by the lag of staff maintenance, increase the service life of the equipment, save the alignment correction time, ensure the working efficiency of the generator, and thus effectively increase the economic benefits. Since the data monitored by the position measuring device is essentially the height and position of the four support bases, and the height and position of the four support bases are also adjusted, the adjustment amount and the monitored amount are the same. Staff only need to adjust the height and position of the four support bases back to the initial height and position according to the values returned by the position measuring device in real time. The dependence on the experience of staff is small, and the adjustment process is simple, so the alignment correction operation is simple.

[0008] For the above technical solution, the following further improvements can be made.

[0009] In a preferred embodiment of the monitoring device for the alignment of a wind turbine shaft according to the present invention, the monitoring device further comprises an alarm device electrically connected to the host computer.

[0010] Through the alarm device, staff can be reminded in real time to perform alignment correction operations on the generator to stop the machine, so as to avoid unnecessary damage to the generator.

[0011] Specifically, in a preferred embodiment, the alarm device includes an alarm lamp and / or a sound alarm.

[0012] With the alarm device of the above structural form, it is convenient for the staff to obtain the alarm signal in a timely manner.

[0013] Furthermore, in a preferred embodiment, there are at least 4 test points, and the 4 test points are symmetrically arranged at the four corners of the generator mounting base.

[0014] The test points arranged in the above form can greatly ensure the accuracy of the monitoring results and at the same time ensure the accuracy of the alignment correction operation.

[0015] Specifically, in a preferred embodiment, the position measuring device includes a laser distance sensor.

[0016] Using a laser distance sensor as the position measuring device, the measurement operation is simple and convenient, and the result is accurate. The sensor has a small weight and does not require a hoisting device for hoisting, greatly reducing the workload of the operator. The connection between the sensor and the processing unit is easy. Only multiple sensors need to be connected to the processing unit through cables. When wiring, pay attention not to let the cables be pressed by the equipment of the generator. It is convenient for maintenance and replacement. The sensor is connected through a cable with a cable. If a certain sensor fails, a new sensor can be directly replaced and it can work normally after simple debugging. It has good interchangeability. The sensors can be directly purchased and used, not customized, increasing the interchangeability between devices and facilitating the mass production and installation of monitoring devices.

[0017] Specifically, in a preferred embodiment, the laser distance sensor for measuring the height position of the corresponding test point is arranged inside the generator support base.

[0018] This structural form can further ensure that the installation of the position measuring device does not exceed the outer dimensions of the motor and does not affect the normal installation of the generator.

[0019] Specifically, in a preferred embodiment, the laser distance sensors for measuring the lateral position and longitudinal position of the corresponding test points are respectively arranged on the generator mounting base through sensor brackets.

[0020] Through the sensor brackets, it can ensure the stable and reliable installation of the sensors while not exceeding the outer dimensions of the generator, with a small weight and not requiring a hoisting device for hoisting, so it will not increase the workload of the staff either.

[0021] Specifically, in a preferred embodiment, the processing unit is installed at a position close to the wind turbine, and the upper computer is installed on the ground.

[0022] The above-mentioned layout structure facilitates, on the one hand, the connection between the processing unit and the position measuring device, thus facilitating the acquisition, processing, and storage of monitoring data, and on the other hand, facilitating the staff to easily obtain the real-time alignment status of the generator set shaft on the ground.

[0023] The method for correcting the alignment of the wind turbine shaft according to the second aspect of the present invention is implemented by using the above-mentioned monitoring device, and specifically includes the following steps: S01. Complete the alignment installation of the generator shaft and the high-speed shaft of the gearbox. S02. Arrange the position measuring device at the test point of the generator mounting base. S03. Use the position measuring device to measure the initial position data of the generator shaft and transmit it to the processing unit, and the processing unit transmits the initial position data to the upper computer. S04. During the operation of the generator, the position measuring device measures the real-time position data of the test point in real time and transmits it to the processing unit, and the processing unit transmits the real-time position data to the upper computer. S05. The processing unit calculates the actual deviation between the actual axis position and the initial axis position of the generator according to the deviation between the real-time position data and the initial position data and transmits the calculation result to the upper computer. S06. The processing unit judges whether the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold and transmits the judgment result to the upper computer. When the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, the generator is shut down for alignment correction, and the position and height of the support base are adjusted back to the initial position and height according to the real-time position data of the test point, thereby completing the alignment correction of the generator shaft.

[0024] Further, in a preferred embodiment, in step S06, when the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, the upper computer issues an alarm signal through the alarm device.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] (1) Simple structure and easy to install

[0027] The sensor is installed on the base to monitor the position of the generator in real time, and the installation can be completed without disassembling the generator. The weight of the sensor and the sensor bracket is small, and no hoisting device is required for hoisting, which greatly reduces the workload of the operator;

[0028] (2) Little restriction on space requirements

[0029] The brackets of the sensors required for installing the lateral and longitudinal distance measuring sensors will not exceed the outer dimensions of the generator, and there is basically no requirement for height. The height measuring sensor is installed on the generator base and will not affect the normal installation of the generator;

[0030] (3) Easy connection between the sensor and the lower computer

[0031] It is only necessary to connect 12 sensors to the lower computer through cables. When wiring, pay attention not to let the cables be pressed by the equipment of the generator;

[0032] (4) Easy to repair and replace

[0033] The sensors are connected through cables with cables. If a certain sensor fails, a new sensor can be directly replaced and can work normally after simple debugging;

[0034] (5) Good interchangeability

[0035] The sensors can all be directly purchased and used, not customized, which increases the interchangeability between devices and is conducive to the mass production and installation of monitoring devices;

[0036] (6) Increased economic benefits

[0037] The staff can easily obtain the real-time alignment status of the generator set shaft on the upper computer, eliminating the need for the staff to climb nearly 100 meters for maintenance. At the same time, it can avoid the damage to the equipment caused by the lag of the staff's maintenance, increase the service life of the equipment, save the alignment correction time, and ensure the working efficiency of the generator.

[0038] (7) Real-time reminder

[0039] When the alignment error between the engine shaft and the high-speed shaft of the gearbox exceeds the full threshold, the alarm device can remind the staff in real time to stop the generator for alignment correction operation to avoid unnecessary damage to the generator. The alarm light or sound alarm can facilitate the staff to obtain the alarm signal in time.

[0040] (8) Simple alignment correction operation

[0041] Since the data monitored by the sensors are essentially the heights and positions of the four support bases, and the heights and positions of the four support bases are also adjusted, the adjustment amount and the monitored amount are the same. The staff only needs to adjust the heights and positions of the four support bases back to the initial heights and positions according to the values returned by the sensors in real time, with little dependence on the staff's experience and a simple adjustment process. Description of the drawings

[0042] In the following, the present invention will be described in more detail based on embodiments and with reference to the drawings. Among them:

[0043] Figure 1 Schematically shows the position of the laser distance sensor for the height position in the monitoring device of Embodiment 1 of the present invention;

[0044] Figure 2Schematically shows the position of the laser range finder for the lateral position in the monitoring device of Embodiment 1 of the present invention;

[0045] Figure 3 Schematically shows the position of the laser range finder for the height position in the monitoring device of Embodiment 1 of the present invention;

[0046] Figure 4 Schematically shows the position of the sensor bracket in the monitoring device of Embodiment 1 of the present invention;

[0047] Figure 5 Schematically shows the positions of four test points on the generator mounting base of Embodiment 1 of the present invention;

[0048] Figure 6 Schematically shows the positional relationship between the four test points on the generator mounting base of Embodiment 1 of the present invention and the generator axis.

[0049] Figure 7 Schematically shows the generator coordinates of Embodiment 1 of the present invention;

[0050] Figure 8 Schematically shows the projection of the generator axis of Embodiment 1 of the present invention on the XZ plane;

[0051] Figure 9 Schematically shows the angular misalignment state of the generator axis of Embodiment 1 of the present invention on the XZ plane;

[0052] Figure 10 Schematically shows the translational misalignment state of the generator axis of Embodiment 1 of the present invention on the XZ plane;

[0053] Figure 11 Schematically shows the projection of the generator axis of Embodiment 1 of the present invention on the XY plane;

[0054] Figure 12 Schematically shows the angular misalignment state of the generator axis of Embodiment 1 of the present invention on the XY plane;

[0055] Figure 13 Schematically shows the translational misalignment state of the generator axis of Embodiment 1 of the present invention on the XY plane;

[0056] Figure 14 Schematically shows the flowchart of the method for correcting the shaft alignment of a wind turbine generator in Embodiment 2 of the present invention.

[0057] In the drawings, like parts are denoted by like reference numerals. The drawings are not drawn to actual scale. Detailed implementation manners

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0059] Figure 1 Schematically shows the positions of the laser distance sensors at the I - IV height positions in the monitoring device of Embodiment 1 of the present invention. Figure 2 Schematically shows the positions of the laser distance sensors at the V - VIII lateral positions in the monitoring device of Embodiment 1 of the present invention. Figure 3 Schematically shows the positions of the laser distance sensors at the IX - XII height positions in the monitoring device of Embodiment 1 of the present invention. Figure 4 Schematically shows the positions of the V - XII sensor brackets in the monitoring device of Embodiment 1 of the present invention. Figure 5 Schematically shows the positions of the four test points A, B, C, and D on the generator mounting base in Embodiment 1 of the present invention. Figure 6 Schematically shows the positional relationship between the test points on the generator mounting base and the axis of the generator in Embodiment 1 of the present invention. Figure 7 Schematically shows the generator coordinates of Embodiment 1 of the present invention. Figure 8 Schematically shows the projection of the axis of the generator in Embodiment 1 of the present invention on the XZ plane. Figure 9 Schematically shows the angular misalignment state of the axis of the generator in Embodiment 1 of the present invention on the XZ plane. Figure 10 Schematically shows the translational misalignment state of the axis of the generator in Embodiment 1 of the present invention on the XZ plane. Figure 11 Schematically shows the projection of the axis of the generator in Embodiment 1 of the present invention on the XY plane. Figure 12 Schematically shows the angular misalignment state of the axis of the generator in Embodiment 1 of the present invention on the XY plane. Figure 13 Schematically shows the translational misalignment state of the axis of the generator in Embodiment 1 of the present invention on the XY plane. Figure 14 Schematically shows the flow chart of the method for correcting the shaft alignment of a wind turbine generator in Embodiment 2 of the present invention.

[0060] Embodiment 1

[0061] The specific implementation manner of the monitoring device for the shaft alignment of a wind turbine generator in the embodiment of the present invention is as follows:

[0062] As Figure 1 shown, a No. I laser distance sensor 1, a No. II laser distance sensor 2, a No. III laser distance sensor 3, and a No. IV laser distance sensor 4 are respectively installed inside the four support bases 21 of the generator. The No. I - IV laser distance sensors 1 - 4 are used to monitor the height position data of the generator 23 in the Z - axis direction.

[0063] As Figure 2 and Figure 4As shown in the figure, the No. V laser range finder 5, No. VI laser range finder 6, No. VII laser range finder 7 and No. VIII laser range finder 8 are respectively installed on the No. V sensor bracket 13, No. VI sensor bracket 14, No. VII sensor bracket 15 and No. VIII sensor bracket 16, and then the No. V - VIII sensor brackets 13 - 16 are installed on the generator mounting base 22. The No. V - VIII laser range finders 5 - 8 are used to monitor the lateral position data of the generator 23 in the Y - axis direction.

[0064] As Figure 3 and Figure 4 shown in the figure, the No. IX laser range finder 9, No. X laser range finder 10, No. XI laser range finder 11 and No. XII laser range finder 12 are respectively installed on the No. IX sensor bracket 17, No. X sensor bracket 18, No. XI sensor bracket 19 and No. XII sensor bracket 20, and then the No. IX - XII sensor brackets 17 - 20 are installed on the base 22. The No. IX - XII laser range finders are used to monitor the longitudinal position data of the generator 23 in the X - axis direction.

[0065] After all the above 12 laser range finders are installed, connect the laser range finders to the processing unit, and then connect the processing unit to the host computer. After power - on, the data measured by the 12 laser range finders will be displayed on the operation interface of the host computer. After the alignment of the generator shaft and the high - speed shaft of the gearbox is completed, these 12 data are the initial position data after the alignment and are saved.

[0066] If the misalignment of the generator shaft and the high - speed shaft of the gearbox occurs due to vibration or other factors, the real - time position data measured by the 12 sensors will definitely deviate from the initial position data. The operator can view the deviation value between the real - time position data and the initial position data on the host computer to see if the deviation is within the allowable range. When the deviation value is within the allowable range, it can be judged that the alignment state of the shaft is good at this time. When the deviation value is outside the allowable range, it can be judged that the alignment state of the shaft is poor at this time, and at this time, the operation of the generator needs to be stopped, and the operator needs to realign the generator.

[0067] The monitoring device for the alignment of the wind turbine shaft according to the embodiment of the present invention installs the position measuring device on the generator mounting base to monitor the position of the generator shaft in real time. It can be installed without disassembling the generator, so the structure is simple and easy to install. The lateral and longitudinal position measuring devices will not exceed the outer dimensions of the generator and have basically no requirements for height. The height position measuring device is installed on the generator mounting base and will not affect the normal installation of the generator, so the space limitation is small. The staff can easily obtain the real-time alignment status of the generator set shaft on the upper computer, eliminating the need for the staff to climb nearly 100 meters for maintenance. At the same time, it can avoid the damage to the equipment caused by the lag of the staff's maintenance, increase the service life of the equipment, save the alignment correction time, ensure the working efficiency of the generator, and thus effectively increase the economic benefits. Since the data monitored by the position measuring device is essentially the height and position of the four support bases, and the height and position of the four support bases are also adjusted, the adjustment amount and the monitored amount are the same. The staff only needs to adjust the height and position of the four support bases back to the initial height and position according to the values returned by the position measuring device in real time, with little dependence on the staff's experience and a simple adjustment process, so the alignment correction operation is simple.

[0068] Using a laser ranging sensor as the position measuring device, the measurement operation is simple and convenient, and the result is accurate. The weight of the sensor and the sensor bracket is small, and no hoisting device is required for hoisting, greatly reducing the workload of the operator. The connection between the sensor and the processing unit is easy. Only multiple sensors need to be connected to the processing unit through cables. When wiring, pay attention not to let the cables be pressed by the generator equipment. It is convenient for maintenance and replacement. The sensor is connected through a cable with a cable. If a certain sensor fails, a new sensor can be directly replaced and can work normally after simple debugging. It has good interchangeability. The sensors can be directly purchased and used, not customized, increasing the interchangeability between equipment and facilitating the mass production and installation of monitoring equipment.

[0069] Preferably, the monitoring device for the alignment of the wind turbine shaft according to the embodiment of the present invention further includes an alarm device electrically connected to the upper computer. Through the alarm device, the staff can be reminded in real time to perform the alignment correction operation on the generator to avoid unnecessary damage to the generator. Specifically, in this embodiment, the alarm device includes an alarm lamp and / or a sound alarm. Through the alarm device with the above structural form, it is convenient for the staff to obtain the alarm signal in time.

[0070] To facilitate the operator to better understand the current alignment status of the generator shaft, a generator coordinate system is established as Figure 7As shown, the base plane is taken as the XY plane, the plane where the generator front face is located is the YZ plane, and the vertical plane passing through the generator axis is the XZ plane. The axis of the generator shaft is projected onto the XY plane and the XZ plane respectively.

[0071] The XY plane generator axis state is as follows Figure 8 As shown, the current generator axis position deviates from the initial axis position, and there is a parallel misalignment deviation ΔY M And angular misalignment Δθ. Figure 2 and Figure 3 The laser ranging sensors V-XII shown are used to monitor Figure 5 Points A, B, C, and D on the generator base are shown. Laser ranging sensor No. V 5 and laser ranging sensor No. IX 9 can measure the Y-axis offset Δy1 and X-axis offset Δx1 of point A, respectively. Laser ranging sensor No. VI 6 and laser ranging sensor No. X 10 can measure the Y-axis offset Δy2 and X-axis offset Δx2 of point B, respectively. Laser ranging sensor No. VII 7 and laser ranging sensor No. XI 11 can measure the Y-axis offset Δy3 and X-axis offset Δx3 of point C, respectively. Laser ranging sensor No. VIII 8 and laser ranging sensor No. XII 12 can measure the Y-axis offset Δy4 and X-axis offset Δx4 of point D, respectively. The initial coordinates of A, B, C, and D on the generator base in the XY plane are (x1, y1), (x2, y2), (x3, y3), and (x4, y4), respectively. When the generator's position changes due to various factors, the coordinates of A, B, C, and D in the XY plane are (x1+Δx1, y1+Δy1), (x2+Δx2, y2+Δy2), (x3+Δx3, y3+Δy3), and (x4+Δx4, y4+Δy4). Let E be the midpoint of the line connecting points A and D, and F be the midpoint of the line connecting points B and C. Then, in the XY plane, the initial coordinates of point E are The initial coordinates of point F are After the motor shaft is offset, the coordinates of point E are The coordinates of point F are

[0072] Then, the offset of point E in the X-axis direction is The offset of point E in the Y-axis direction is The offset of point F in the X-axis direction is The offset of point F in the Y-axis direction is The offset of point M in the X-axis direction is The offset of point M in the Y-axis direction is The angle between the real-time axis position of the generator shaft and the initial axis position is

[0073] As Figure 9 shown, when ΔY E and ΔY F are equal in magnitude and opposite in direction, the generator shaft is angularly misaligned, and the included angle between the real-time axis position and the initial axis position of the generator shaft is

[0074] As Figure 10 shown, when ΔY E and ΔY F are equal in magnitude and the same in direction, the generator shaft is translationally misaligned, and the parallel offset between the real-time axis position and the initial axis position of the generator shaft is or

[0075] The state of the generator shaft in the XZ plane is as Figure 11 shown. There is a deviation between the current position of the generator axis and the initial axis position, and there are translational misalignment deviation ΔZ M and angular misalignment deviation Using Figure 1 and Figure 3 shown, the No. I-IV laser range sensors and the No. IX-XII laser range sensors are used to monitor the points A, B, C, and D on the generator base respectively as Figure 5 shown. The No. I laser range sensor 1 and the No. IX laser range sensor 9 can respectively measure the offset value Δz1 in the Z-axis direction and the offset value Δx1 in the X-axis direction of point A; the No. II laser range sensor 2 and the No. X laser range sensor 10 can respectively measure the offset value Δz2 in the Z-axis direction and the offset value Δx2 in the X-axis direction of point B; the No. III laser range sensor 3 and the No. XI laser range sensor 11 can respectively measure the offset value Δz3 in the Z-axis direction and the offset value Δx3 in the X-axis direction of point C; the No. IV laser range sensor 4 and the No. XII laser range sensor 12 can respectively measure the offset value Δz4 in the Z-axis direction and the offset value Δx4 in the X-axis direction of point D. Among them, the initial coordinates of points A, B, C, and D on the generator base in the XZ plane are (x1, z1), (x2, z2), (x3, z3), and (x4, z4) respectively. When the position of the generator changes due to various factors, the coordinates of A, B, C, and D in the XZ plane are (x1 + Δx1, z1 + Δz1), (x2 + Δx2, z2 + Δz2), (x3 + Δx3, z3 + Δz3), and (x4 + Δx4, z4 + Δz4) respectively. E is the midpoint of the line connecting points A and D, and F is the midpoint of the line connecting points B and C. Then, in the XZ plane, the initial coordinates of point E are The initial coordinates of point F are After the motor shaft is offset, the coordinates of point E are The coordinates of point F are

[0076] Then, the offset of point E in the X-axis direction is The offset of point E in the Z-axis direction is The offset of point F in the X-axis direction is The offset of point F in the Z-axis direction is The offset of point M in the X-axis direction is The offset of point M in the Z-axis direction is The angle between the real-time axis position and the initial axis position of the generator shaft is

[0077] As Figure 12 shown, when ΔZ E and ΔZ F are equal in magnitude and opposite in direction, the generator shaft is angularly misaligned, and the angle between the real-time axis position and the initial axis position of the generator shaft is

[0078] As Figure 13 shown, when ΔZ E and ΔZ F are equal in magnitude and the same in direction, the generator shaft is translationally misaligned, and the parallel offset between the real-time axis position and the initial axis position of the generator shaft is Or

[0079] Embodiment 2

[0080] As Figure 14As shown in the figure, the method for correcting the alignment of the wind turbine shaft according to the embodiment of the present invention is implemented by using the above-mentioned monitoring device, and specifically includes the following steps: S01. Complete the alignment installation of the generator shaft and the high-speed shaft of the gearbox by using the conventional method. S02. Install 12 laser distance sensors at the test points A, B, C, and D on the generator mounting base 22 correspondingly. S03. Take the data obtained by the 12 laser distance sensors at this time as the initial position data of the motor shaft, and transmit it to the processing unit. The processing unit transmits the initial position data to the upper computer for storage. S04. During the operation of the generator, the laser distance sensors measure the real-time lateral, longitudinal, and height position data of the four corners of the generator mounting base in real time and transmit it to the processing unit. The processing unit transmits the real-time position data to the upper computer. S05. The processing unit calculates the actual deviation between the actual axis position and the initial axis position of the generator according to the deviation between the real-time position data and the initial position data and transmits the calculation result to the upper computer. S06. The processing unit judges whether the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, and transmits the judgment result to the upper computer. When the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, the generator continues to operate. When the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, stop the generator for alignment correction, and adjust the position and height of the support base back to the initial position and height according to the real-time position data of the test points, thereby completing the alignment correction of the generator shaft.

[0081] Further, in this embodiment, in step S06, when the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, the upper computer issues an alarm signal through the alarm device.

[0082] According to the above embodiment, it can be seen that the monitoring device and correction method for the alignment of the wind turbine shaft involved in the present invention have a simple structure, are easy to install, have little space requirement limitation, are convenient for maintenance, have good interchangeability, high economic benefits, and simple alignment correction operation.

[0083] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A correction method for the alignment of a wind turbine shaft, characterized in that, The correction method is implemented by using a monitoring device for the alignment of the wind turbine shaft. The monitoring device includes a position measuring device, a processing unit, and a host computer. Among them, test points are evenly arranged on the generator mounting base. There are at least 4 test points, and the 4 test points are symmetrically arranged at the four corners of the generator mounting base. The position measuring device for respectively measuring the lateral, longitudinal, and height positions of each test point is provided at each test point. The processing unit is used to collect the initial position data and real-time position data of the generator shaft transmitted by the position measuring device, calculate the deviation between the real-time position data and the initial position data, and determine whether the alignment error between the generator shaft and the high-speed shaft of the gearbox exceeds the safety threshold according to the deviation. The host computer is used to receive, store, and display the initial position data, real-time position data, the deviation between the real-time position data and the initial position data, and the determination result transmitted by the processing unit. The correction method specifically includes the following steps: S01. Complete the alignment installation of the generator shaft and the high-speed shaft of the gearbox. S02. Arrange the position measuring device at the test points on the generator mounting base. S03. Use the position measuring device to measure the initial position data of the generator shaft and transmit it to the processing unit, and the processing unit transmits the initial position data to the host computer. S04. During the operation of the generator, the position measuring device measures the real-time position data of the test points in real time and transmits it to the processing unit, and the processing unit transmits the real-time position data to the host computer. S05. The processing unit calculates the actual deviation between the actual axis position and the initial axis position of the generator according to the deviation between the real-time position data and the initial position data and transmits the calculation result to the host computer. S06. The processing unit judges whether the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold and transmits the judgment result to the host computer. When the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, stop the generator for alignment correction, and adjust the position and height of the support base back to the initial position and height according to the real-time position data of the test points to complete the alignment correction of the generator shaft. Among them, the actual deviation in S05 includes: When the generator shaft is angular misalignment, the included angle between the real-time axis position and the initial axis position of the generator shaft. When the generator shaft is translational misalignment, the parallel offset between the real-time axis position and the initial axis position of the generator shaft. In step S06, when the judgment result is that the actual deviation between the actual axis position and the initial axis position of the generator exceeds the safety threshold, the host computer sends an alarm signal through the alarm device.

2. The method for correcting the alignment of a wind turbine shaft according to claim 1, characterized in that, The monitoring device further includes an alarm device electrically connected to the host computer.

3. The method for correcting the alignment of a wind turbine shaft according to claim 2, characterized in that The alarm device includes an alarm lamp and / or a sound alarm.

4. The method for correcting the alignment of a wind turbine shaft according to any one of claims 1 to 3, characterized in that, The position measuring device includes a laser range finder.

5. The method for correcting the alignment of the shaft of a wind turbine according to claim 4, characterized in that, The laser range finder for measuring the height position of the corresponding test point is arranged inside the generator support base.

6. The correction method for shaft alignment of a wind turbine according to claim 4, characterized in that, The laser range finders for measuring the lateral position and the longitudinal position of the corresponding test points are respectively arranged on the generator mounting base through sensor brackets.

7. The method for correcting the alignment of a wind turbine shaft according to any one of claims 1 to 3, characterized in that The processing unit is installed near the wind turbine, and the host computer is installed on the ground.

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