Wind turbine main shaft runout monitoring method and device based on laser ranging

Abstract

The application provides a wind turbine main shaft runout monitoring method and device based on laser ranging, the method comprising: obtaining first measurement data and second measurement data collected by a first laser ranging module and a second laser ranging module respectively; wherein the first laser ranging module and the second laser ranging module are arranged on a front bearing seat of a wind turbine main shaft and used for measuring the distance between the front bearing seat and an impeller lock disc; based on the rotation period of the impeller lock disc, the first measurement data and the second measurement data are corrected to obtain first correction data and second correction data; the data difference between the first correction data and the second correction data is calculated; based on the data difference, the runout result of the main shaft is obtained, the runout type and direction of the main shaft are accurately judged, high-precision and real-time main shaft runout monitoring is realized, the reliability and robustness of the monitoring system are effectively improved, the possibility of misjudgment and missed judgment is reduced, and the safe operation of the wind turbine is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine fault detection, and in particular to a wind turbine main shaft runout monitoring method and device based on laser ranging. BACKGROUND

[0002] Currently, the problem of wind turbine main shaft runout is increasingly prominent, especially the risk of main shaft runout of old units has significantly increased. Main shaft runout can cause serious consequences such as cabin fire and bearing failure.

[0003] Traditional monitoring methods mainly rely on vibration sensors and temperature sensors, but these methods have obvious limitations. Vibration monitoring detects vibration signals by installing acceleration sensors radially on the bearing seat, but the vibration characteristics of main shaft runout are easily confused with faults such as impeller imbalance or main shaft abnormal sound, making it difficult to accurately warn. Temperature monitoring judges the bearing state by measuring the change of bearing internal oil temperature, but the oil temperature rise may also be caused by rolling body wear and other factors, and cannot directly reflect the main shaft runout. Therefore, the existing technology cannot directly and accurately monitor the main shaft runout. SUMMARY

[0004] The present application provides a wind turbine main shaft runout monitoring method and device based on laser ranging to solve the technical problem that the existing technology cannot accurately monitor the wind turbine main shaft runout.

[0005] In one aspect, the present application provides a wind turbine main shaft runout monitoring method based on laser ranging, comprising:

[0006] Obtaining first measurement data and second measurement data collected by a first laser ranging module and a second laser ranging module respectively; wherein the first laser ranging module and the second laser ranging module are arranged on the front bearing seat of the wind turbine main shaft, and are used to measure the distance between them and the impeller lock disc;

[0007] Based on the rotation period of the impeller lock disc, the first measurement data and the second measurement data are corrected to obtain first correction data and second correction data;

[0008] Calculating the data difference of the first correction data and the second correction data;

[0009] Based on the data difference, the runout result of the main shaft is obtained.

[0010] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the present application, the runout result of the main shaft is obtained based on the data difference, which comprises:

[0011] If the data difference value is less than a preset threshold value, and the first correction data and the second correction data are both reduced, it is determined that the main shaft has axial movement towards the direction of the impeller lock disc;

[0012] If the data difference value is less than a preset threshold value, and the first correction data and the second correction data are both increased, it is determined that the main shaft has axial movement away from the direction of the impeller lock disc;

[0013] If the data difference value is greater than or equal to a preset threshold value, it is determined that the main shaft has deflection movement, and the direction of the deflection movement is determined based on the first correction data and the second correction data.

[0014] According to the wind turbine main shaft movement monitoring method based on laser ranging provided by the application, the first measurement data and the second measurement data are corrected based on the rotation period of the impeller lock disc to obtain first correction data and second correction data, including:

[0015] The first measurement data and the second measurement data are respectively subjected to time domain synchronous analysis to extract first periodic fluctuation components and second periodic fluctuation components corresponding to the rotation period of the impeller lock disc;

[0016] The first periodic fluctuation components and the second periodic fluctuation components corresponding to the first measurement data and the second measurement data are removed to obtain the first correction data and the second correction data.

[0017] According to the wind turbine main shaft movement monitoring method based on laser ranging provided by the application, the first measurement data and the second measurement data are respectively subjected to time domain synchronous analysis to extract first periodic fluctuation components and second periodic fluctuation components corresponding to the rotation period of the impeller lock disc, including:

[0018] The rotation angle of the impeller lock disc is obtained;

[0019] The first measurement data and the second measurement data are respectively subjected to time domain synchronous analysis to extract first periodic fluctuation components and second periodic fluctuation components corresponding to the rotation period of the impeller lock disc, including:

[0020] The first measurement data and the second measurement data are respectively subjected to time domain synchronous analysis to extract first periodic fluctuation components and second periodic fluctuation components corresponding to the rotation period of the impeller lock disc, including:

[0021] The first measurement data and the second measurement data of the current period are respectively matched with the first periodic fluctuation component template and the second periodic fluctuation component template to obtain the first periodic fluctuation component and the second periodic fluctuation component.

[0022] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the application, the first laser ranging module and the second laser ranging module are adjustably installed on the front bearing seat of the wind turbine main shaft through magnetic attraction type supports.

[0023] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the application, before the first measurement data and the second measurement data are corrected based on the rotation period of the impeller lock disc, the method further comprises the following steps of:

[0024] detecting abnormal conditions of the first laser ranging module and the second laser ranging module;

[0025] when one of the first laser ranging module and the second laser ranging module is abnormal, detecting the runout result of the main shaft based on the other laser ranging module.

[0026] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the application, before the abnormal conditions of the first laser ranging module and the second laser ranging module are detected, the method further comprises the following steps of:

[0027] performing noise reduction processing on the first measurement data and the second measurement data.

[0028] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the application, the installation axis of the first laser ranging module and the second laser ranging module is at a non-symmetrical angle with the main shaft axis.

[0029] According to the wind turbine main shaft runout monitoring method based on laser ranging provided by the application, after the runout result of the main shaft is obtained based on the data difference value, the method further comprises the following steps of:

[0030] based on the runout result, generating corresponding protection measures.

[0031] In another aspect, the application further provides a wind turbine main shaft runout monitoring device based on laser ranging, comprising:

[0032] a data acquisition module, configured to acquire first measurement data and second measurement data collected by a first laser ranging module and a second laser ranging module; wherein the first laser ranging module and the second laser ranging module are arranged in axial symmetry on a front bearing seat of a wind turbine main shaft, and are configured to measure the distance between the first laser ranging module and the second laser ranging module and an impeller lock disc;

[0033] a data correction module, configured to correct the first measurement data and the second measurement data based on the rotation period of the impeller lock disc, to obtain first correction data and second correction data;

[0034] a calculation module configured to calculate a data difference between the first correction data and the second correction data;

[0035] a runout detection module configured to obtain a runout result of the main shaft based on the data difference.

[0036] The wind turbine main shaft runout monitoring method and device based on laser ranging provided by the application directly measure the distance change between the main shaft and the impeller lock disc by arranging two laser ranging modules on the front bearing seat of the main shaft, correct the measurement data based on the rotation period of the impeller lock disc, remove the periodic interference, and then calculate the data difference after correction, accurately determine the runout type and direction of the main shaft, realize high-precision and real-time main shaft runout monitoring, effectively improve the reliability and robustness of the monitoring system, reduce the possibility of misjudgment and missed judgment, and ensure the safe operation of the wind turbine. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0038] Figure 1 is a flowchart of the wind turbine main shaft runout monitoring method based on laser ranging provided by the embodiment of the application;

[0039] Figure 2 is a scene diagram of the wind turbine main shaft runout monitoring method based on laser ranging provided by the embodiment of the application;

[0040] Figure 3 is a structural diagram of the wind turbine main shaft runout monitoring device based on laser ranging provided by the embodiment of the application;

[0041] Figure 4 is a structural diagram of the electronic device provided by the embodiment of the application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the application more clear, the technical solutions in the application will be described clearly and completely below in combination with the drawings in the application. Obviously, the described embodiments are some embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0043] Figure 1is a flowchart of a wind turbine main shaft runout monitoring method based on laser ranging provided by an embodiment of the present application. The execution subject of the method can be a field end server.

[0044] Referring to Figure 1 The wind turbine main shaft runout monitoring method based on laser ranging can include the following steps 101 to 104.

[0045] Step 101, acquire first measurement data and second measurement data collected by a first laser ranging module and a second laser ranging module respectively; wherein the first laser ranging module and the second laser ranging module are arranged on a front bearing seat of a wind turbine main shaft, for measuring the distance between the front bearing seat and an impeller lock disc.

[0046] In this step, the first laser ranging module and the second laser ranging module are a kind of high-precision measuring tools, which can measure the distance by emitting a laser beam and receiving reflected light. The impeller lock disc is usually used to fix the impeller, and by measuring the distance between the main shaft and the impeller lock disc, the position change of the main shaft can be indirectly reflected. Generally, the first laser ranging module and the second laser ranging module can be arranged axially symmetrically on the front bearing seat of the wind turbine main shaft.

[0047] Step 102, correct the first measurement data and the second measurement data based on the rotation period of the impeller lock disc, to obtain first corrected data and second corrected data.

[0048] Step 102 can specifically include:

[0049] Step one, respectively analyze the first measurement data and the second measurement data in time domain, and extract first periodic fluctuation component and second periodic fluctuation component corresponding to the rotation period of the impeller lock disc;

[0050] Step two, eliminate the first periodic fluctuation component and the second periodic fluctuation component corresponding to the first measurement data and the second measurement data respectively, to obtain the first corrected data and the second corrected data.

[0051] Wherein, the above step one can specifically include:

[0052] First, acquire the rotation angle of the impeller lock disc;

[0053] In this step, by acquiring the rotation angle of the impeller lock disc, the rotation period thereof can be determined, and then the measurement data can be processed synchronously. Assuming that the rotation period of the impeller lock disc is 1 second (i.e. one revolution per second), the rotation angle of the impeller lock disc can be acquired in real time by an angle sensor, and the angle range is from 0° to 360°.

[0054] Second step, based on the rotation angle, the first measurement data and the second measurement data are respectively time-domain synchronous segmented according to the rotation period, to obtain the first measurement data segment and the second measurement data segment in multiple periods;

[0055] In this step, the first measurement data and the second measurement data are respectively segmented according to the rotation period of the impeller lock disc, ensuring that each data segment corresponds to a complete rotation period. The sampling frequency of the first laser ranging module and the second laser ranging module determines how many data points can be obtained in each period. For example, if the sampling frequency of the laser ranging module is 10 times per second, then in a 1-second period, 10 data points will be generated. The rotation period of the impeller lock disc determines the length of each period. If the impeller lock disc rotates one revolution per second (i.e. the period is 1 second), then in 1 second, the laser ranging module will collect the corresponding number of data points according to its sampling frequency, i.e. 10 data points per second.

[0056] Third step, the first measurement data segment and the second measurement data segment are respectively subjected to periodic average processing, to obtain the first periodic fluctuation component template and the second periodic fluctuation component template respectively;

[0057] In this step, it is assumed that in a 1-second period, the laser ranging module will collect 10 data points, and 10 seconds will experience 10 periods. For each period, the average value in the period can be calculated, and the average value of each period can be regarded as the corresponding periodic fluctuation component template.

[0058] Fourth step, the first measurement data and the second measurement data of the current period are respectively matched with the first periodic fluctuation component template and the second periodic fluctuation component template respectively, to obtain the first periodic fluctuation component and the second periodic fluctuation component;

[0059] In this step, take one of the periods as an example, for example, select period 1. The original data of period 1 includes 100, 102, 101, 103, 102, 104, 103, 105, 104, 106. Then the periodic fluctuation component template is 103. The periodic fluctuation component is (100-103), (102-103), (101-103), (103-103), (102-103), (104-103), (103-103), (105-103), (104-103), (106-103), i.e. -3, -1, -2, 0, -1, 1, 0, 2, 1, 3.

[0060] For the above step two, continue to take period 1 as an example, the original data includes 100, 102, 101, 103, 102, 104, 103, 105, 104, 106; the periodic fluctuation component is -3, -1, -2, 0, -1, 1, 0, 2, 1, 3; the corrected data is 103, 103, 103, 103, 103, 103, 103, 103, 103, 103.

[0061] The above step 102 effectively removes the periodic interference caused by the mechanical eccentricity of the impeller lock disc through time domain synchronous analysis and periodic average processing, improves the accuracy and reliability of the main shaft runout monitoring, has strong dynamic adaptability, high data stability and strong robustness, and can provide high-quality data support for subsequent runout result judgment and protection measures.

[0062] Step 103, calculate the data difference value of the first corrected data and the second corrected data.

[0063] In this step, the data difference value, i.e. the result obtained by subtracting the first corrected data and the second corrected data.

[0064] Step 104, based on the data difference value, the runout result of the main shaft is obtained.

[0065] In this embodiment, by arranging two laser ranging modules on the main shaft front bearing seat, the distance change between the main shaft and the impeller lock disc is directly measured, and the measurement data is corrected based on the rotation period of the impeller lock disc to remove periodic interference, and then the corrected data difference value is calculated to accurately judge the runout type and direction of the main shaft, realizing high-precision and real-time main shaft runout monitoring, effectively improving the reliability and robustness of the monitoring system, reducing the possibility of misjudgment and omission, and ensuring the safe operation of the wind turbine.

[0066] In an embodiment of the present application, based on the data difference value, the runout result of the main shaft is obtained, including:

[0067] If the data difference value is less than the preset threshold value, and the first corrected data and the second corrected data are both reduced, it is determined that the main shaft has axial runout towards the direction of approaching the impeller lock disc;

[0068] If the data difference value is less than the preset threshold value, and the first corrected data and the second corrected data are both increased, it is determined that the main shaft has axial runout towards the direction of moving away from the impeller lock disc;

[0069] If the data difference value is greater than or equal to the preset threshold value, it is determined that the main shaft has deflection runout, and the direction of the deflection runout is determined based on the first corrected data and the second corrected data.

[0070] In this embodiment, the preset threshold is a reference value for distinguishing between axial movement and skew movement, which can be set according to the actual application scenario and monitoring accuracy requirements. For example, if the difference is less than the preset threshold, the movement of the main shaft is axial; if the difference is greater than or equal to the preset threshold, the movement of the main shaft is skew. By comparing the change trend of the first correction data and the second correction data, the direction of the skew can be further determined. For example, if the first correction data decreases and the second correction data increases, it indicates that the main shaft is skewed towards the first laser ranging module; if the first correction data increases and the second correction data decreases, it indicates that the main shaft is skewed towards the second laser ranging module.

[0071] By setting the preset threshold and combining the data difference and the change trend of the correction data, this embodiment can accurately determine the type (axial movement or skew movement) and direction of the main shaft movement, which not only improves the accuracy of monitoring, but also provides more detailed information for subsequent fault diagnosis and protection measures. By accurately determining the type and direction of movement, potential problems caused by the movement of the main shaft of the wind turbine generator can be more effectively prevented and handled, ensuring the safe operation of the wind turbine generator.

[0072] In an embodiment of the present specification, the first laser ranging module and the second laser ranging module are adjustably mounted on the front bearing seat of the main shaft of the wind turbine generator by a magnetic support.

[0073] In this embodiment, the magnetic support is a device that uses magnetic force to adhere to a metal surface. The magnetic support can quickly adhere to the front bearing seat of the main shaft of the wind turbine generator, without the need for complex mechanical fixing devices, making the installation process simple and fast. The magnetic support is usually designed to be adjustable, allowing the installation position and angle of the laser ranging module to be adjusted as needed to ensure the accuracy and reliability of the measurement.

[0074] In an embodiment of the present specification, before correcting the first measurement data and the second measurement data based on the rotation period of the impeller lock disc, further comprising:

[0075] Detecting abnormal conditions of the first laser ranging module and the second laser ranging module;

[0076] When one of the first laser ranging module and the second laser ranging module is abnormal, detecting the movement of the main shaft based on the other laser ranging module.

[0077] In the embodiment, the abnormal situation can include loss or abnormal fluctuation of the measurement data, hardware failure of the laser ranging module, etc. The abnormal situation can be detected by, for example, data integrity checking, checking whether the measurement data is continuous and whether there is data loss; data rationality checking, analyzing whether the measurement data is within a reasonable range and whether there is abnormal fluctuation; self-checking function, detecting whether the hardware is working normally by using the self-checking function of the laser ranging module. Based on the detection result of the shaft runout by another laser ranging module, that is, the distance between the shaft and the impeller lock plate is obtained according to the measurement data of another laser ranging module, and whether the shaft runout is determined according to the size of the distance, for example, the distance becomes smaller, which means the shaft runout is towards the impeller lock plate; the distance becomes larger, which means the shaft runout is away from the impeller lock plate.

[0078] In an embodiment of the present specification, before detecting the abnormal situation of the first laser ranging module and the second laser ranging module, further comprising:

[0079] The first measurement data and the second measurement data are subjected to noise reduction processing.

[0080] In the embodiment, the noise reduction processing mode can include filtering processing, wavelet transform and data smoothing, etc. By performing noise reduction processing on the measurement data, the quality of the measurement data and the reliability of the abnormality detection are significantly improved, not only reducing the misjudgment caused by environmental noise or equipment noise, but also improving the accuracy of the abnormality detection.

[0081] In an embodiment of the present specification, the installation axis of the first laser ranging module and the second laser ranging module is asymmetrically angled with the shaft axis.

[0082] In the embodiment, the shaft axis is the center line of the shaft, which is assumed to be along the horizontal direction (X-axis direction). The installation axis refers to the measurement direction of the laser ranging module, that is, the emission direction of the laser beam. If there is a certain angle between the installation axis of the two laser ranging modules and the shaft axis, their installation is asymmetric, and the asymmetric angle can be any angle, for example, the angle between the installation axis of the first laser ranging module and the shaft axis is 15°, and the angle between the installation axis of the second laser ranging module and the shaft axis is -15°.

[0083] The embodiment sets the installation axis of the laser ranging module to be asymmetrically angled with the shaft axis, which not only reduces the measurement blind area, but also more comprehensively detects the shaft runout, especially the skew runout, and can significantly improve the accuracy and reliability of the shaft runout monitoring.

[0084] In an embodiment of the present specification, after obtaining the shaft runout result based on the data difference value, further comprising:

[0085] Based on the runout result, corresponding protection measures are generated.

[0086] In this embodiment, various protective measures can be implemented. For example, when the main shaft misalignment exceeds a safety threshold, the system automatically triggers a shutdown procedure to stop the wind turbine's operation and prevent further damage. Maintenance personnel are alerted to promptly inspect and address the issue via audible and visual alarms or remote notifications. Operating parameters of the wind turbine are adjusted based on the misalignment, such as reducing the speed or adjusting the load, to alleviate the burden on the main shaft. By generating corresponding protective measures after detecting main shaft misalignment, the safety and reliability of the wind turbine can be significantly improved.

[0087] Figure 2 This is a schematic diagram illustrating a scenario of the laser ranging-based wind turbine main shaft axial movement monitoring method provided in an embodiment of the present invention. See also... Figure 2 The impeller locking disc is used to connect the impeller. Two laser ranging sensors (i.e., the first laser ranging module and the second laser ranging module) are mounted on the front bearing housing of the main shaft, each used to measure distance D1 (i.e., the first measurement data) and distance D2 (i.e., the second measurement data). The data acquisition unit can acquire distances D1 and D2 via an RS485 interface, and then send them to the field server through the wind turbine ring network. The field server executes the aforementioned laser ranging-based wind turbine main shaft axial movement monitoring method on distances D1 and D2.

[0088] Based on the same general inventive concept, this invention also protects a wind turbine main shaft axial movement monitoring device based on laser ranging, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of the wind turbine main shaft axial movement monitoring device based on laser ranging provided in an embodiment of the present invention. The following describes the wind turbine main shaft axial movement monitoring device based on laser ranging provided by the present invention. The wind turbine main shaft axial movement monitoring device described below can be referred to in correspondence with the wind turbine main shaft axial movement monitoring method described above.

[0089] The laser ranging-based wind turbine main shaft axial movement monitoring device includes a data acquisition module 301, a data correction module 302, a calculation module 303, and an axial movement detection module 304.

[0090] The data acquisition module 301 is used to acquire the first measurement data and the second measurement data collected by the first laser ranging module and the second laser ranging module respectively; wherein, the first laser ranging module and the second laser ranging module are axially symmetrically arranged on the front bearing seat of the wind turbine main shaft, and are used to measure the distance between them and the impeller lock disc;

[0091] The data correction module 302 is used to correct the first measurement data and the second measurement data based on the rotation cycle of the impeller lock disc to obtain the first corrected data and the second corrected data.

[0092] Calculation module 303 is used to calculate the data difference between the first corrected data and the second corrected data;

[0093] The axial movement detection module 304 is used to obtain the axial movement result of the spindle based on the data difference.

[0094] Figure 4 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention.

[0095] like Figure 4 As shown, the electronic device may include a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions from the memory 430 to execute a laser ranging-based method for monitoring the main shaft movement of wind turbine generators.

[0096] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0097] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the laser ranging-based wind turbine main shaft axial movement monitoring method provided by the above methods.

[0098] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the laser ranging-based wind turbine main shaft axial movement monitoring method provided by the above methods.

[0099] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0100] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0101] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for monitoring the main shaft axial movement of a wind turbine based on laser ranging, characterized in that, include: The system acquires first measurement data and second measurement data collected by the first laser ranging module and the second laser ranging module, respectively. The first laser ranging module and the second laser ranging module are mounted on the front bearing housing of the wind turbine main shaft and are used to measure the distance between the main shaft and the impeller lock disc. Based on the rotation period of the impeller lock disc, the first measurement data and the second measurement data are corrected to obtain the first corrected data and the second corrected data; Calculate the data difference between the first corrected data and the second corrected data; Based on the data difference, the axial movement result of the spindle is obtained; The step of obtaining the spindle misalignment result based on the data difference includes: If the data difference is less than a preset threshold, and both the first corrected data and the second corrected data decrease, then it is determined that the main shaft has axial movement toward the impeller lock disc. If the data difference is less than a preset threshold, and both the first correction data and the second correction data increase, then it is determined that the main shaft has axial movement away from the impeller lock disc. If the data difference is greater than or equal to a preset threshold, it is determined that the spindle has a skew or skewing motion, and the direction of the skew or skewing motion is determined based on the first correction data and the second correction data. The step of correcting the first and second measurement data based on the rotation period of the impeller lock disc to obtain first corrected data and second corrected data includes: Time-domain synchronous analysis is performed on the first measurement data and the second measurement data respectively to extract the first periodic fluctuation component and the second periodic fluctuation component corresponding to the rotation period of the impeller lock disc. The first and second periodic fluctuation components are removed from the first and second measurement data respectively to obtain the first and second corrected data. The step of performing time-domain synchronous analysis on the first and second measurement data respectively, and extracting the first and second periodic fluctuation components corresponding to the rotation period of the impeller lock disc, includes: Obtain the rotation angle of the impeller lock disc; Based on the rotation angle, the first measurement data and the second measurement data are time-domain synchronously segmented according to the rotation period to obtain the first measurement data segment and the second measurement data segment within multiple periods; The first measurement data segment and the second measurement data segment are respectively subjected to periodic averaging to obtain their respective first periodic fluctuation component templates and second periodic fluctuation component templates; The first and second measurement data of the current period are matched with their respective first and second periodic fluctuation component templates to obtain the first and second periodic fluctuation components.

2. The method for monitoring the main shaft axial movement of a wind turbine based on laser ranging according to claim 1, characterized in that, The first laser ranging module and the second laser ranging module are adjustablely mounted on the front bearing seat of the wind turbine main shaft via magnetic brackets.

3. The method for monitoring the main shaft axial movement of a wind turbine based on laser ranging according to claim 1, characterized in that, Before correcting the first and second measurement data based on the rotation cycle of the impeller lock disc, the method further includes: Detect any abnormalities in the first laser ranging module and the second laser ranging module; When one of the first laser ranging module and the second laser ranging module malfunctions, the spindle movement is detected based on the other laser ranging module.

4. The method for monitoring the main shaft axial movement of a wind turbine based on laser ranging according to claim 3, characterized in that, Before detecting abnormalities in the first laser ranging module and the second laser ranging module, the method further includes: The first and second measurement data are subjected to noise reduction processing.

5. The method for monitoring the main shaft axial movement of a wind turbine based on laser ranging according to claim 1, characterized in that, The mounting axes of the first laser ranging module and the second laser ranging module form an asymmetrical angle with the main shaft axis.

6. The method for monitoring the main shaft axial movement of a wind turbine based on laser ranging according to claim 1, characterized in that, After obtaining the spindle misalignment result based on the data difference, the method further includes: Based on the results of the crosstalk, corresponding protection measures are generated.

7. A wind turbine main shaft axial movement monitoring device based on laser ranging, characterized in that, The wind turbine main shaft axial movement monitoring device uses the wind turbine main shaft axial movement monitoring method based on laser ranging as described in any one of claims 1 to 6, and the wind turbine main shaft axial movement monitoring device comprises: The data acquisition module is used to acquire the first measurement data and the second measurement data collected by the first laser ranging module and the second laser ranging module respectively; wherein, the first laser ranging module and the second laser ranging module are axially symmetrically arranged on the front bearing seat of the wind turbine main shaft, and are used to measure the distance between them and the impeller lock disc; The data correction module is used to correct the first measurement data and the second measurement data based on the rotation period of the impeller lock disc to obtain the first corrected data and the second corrected data. The calculation module is used to calculate the data difference between the first corrected data and the second corrected data; The axial movement detection module is used to obtain the axial movement result of the spindle based on the data difference.

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