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

Abstract

The invention provides a wind turbine generator main shaft play monitoring method and device based on laser ranging. The method comprises the steps that first measurement data and second measurement data collected by a first laser ranging module and a second laser ranging module respectively are acquired; wherein the first laser ranging module and the second laser ranging module are arranged on a front bearing seat of a wind turbine generator main shaft and are used for measuring the distance between the front bearing seat and an impeller lock disc; correcting 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; calculating a data difference value between the first correction data and the second correction data; based on the data difference value, the play result of the main shaft is obtained, the play type and direction of the main shaft are accurately judged, high-precision and real-time main shaft play monitoring is achieved, the reliability and robustness of a monitoring system are effectively improved, the possibility of misjudgment and missed judgment is reduced, and safe operation of a wind turbine generator is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine fault detection, and particularly to a method and device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging. Background Art

[0002] Currently, the problem of axial movement of the main shaft of wind turbines is becoming increasingly prominent, especially the risk of axial movement of the main shaft of old and worn-out units has increased significantly. The axial movement of the main shaft may lead to serious consequences such as the engine room catching 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 housing, but the vibration characteristics of the axial movement of the main shaft are easily confused with faults such as impeller imbalance or abnormal noise of the main shaft, making it difficult to accurately give early warnings. Temperature monitoring determines the bearing state by measuring the change in the oil temperature inside the bearing, but the increase in oil temperature may also be caused by other factors such as the wear of rolling elements, and it cannot directly reflect the axial movement of the main shaft. Therefore, it is difficult for the existing technology to achieve direct and accurate monitoring of the axial movement of the main shaft. Summary of the Invention

[0004] The present invention provides a method and device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging to solve the technical problem in the existing technology that the axial movement of the main shaft of a wind turbine cannot be accurately monitored.

[0005] On the one hand, the present invention provides a method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging, including: 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 housing of the main shaft of the wind turbine and are used to measure the distance between them and the impeller locking disc; Based on the rotation period of the impeller locking disc, correcting the first measurement data and the second measurement data to obtain first corrected data and second corrected data; Calculating the data difference between the first corrected data and the second corrected data; Based on the data difference, obtaining the axial movement result of the main shaft.

[0006] According to the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, the obtaining the axial movement result of the main shaft 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, it is determined that the main shaft has axial movement in the direction close to the impeller locking disc; If the data difference is less than a preset threshold and both the first corrected data and the second corrected data increase, it is determined that there is an axial movement of the main shaft away from the impeller locking disc; If the data difference is greater than or equal to the preset threshold, it is determined that there is a skewed movement of the main shaft, and the direction of the skewed movement is determined based on the first corrected data and the second corrected data.

[0007] According to a method for monitoring the movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, correcting the first measurement data and the second measurement data based on the rotation period of the impeller locking disc to obtain first corrected data and second corrected data includes: Performing time-domain synchronous analysis on the first measurement data and the second measurement data respectively, and extracting a first periodic fluctuation component and a second periodic fluctuation component corresponding to the rotation period of the impeller locking disc respectively; Removing the first periodic fluctuation component and the second periodic fluctuation component corresponding to each from the first measurement data and the second measurement data respectively to obtain first corrected data and second corrected data.

[0008] According to a method for monitoring the movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, performing time-domain synchronous analysis on the first measurement data and the second measurement data respectively, and extracting a first periodic fluctuation component and a second periodic fluctuation component corresponding to the rotation period of the impeller locking disc respectively includes: Obtaining the rotation angle of the impeller locking disc; Taking the rotation angle as a reference, synchronously dividing the first measurement data and the second measurement data by rotation period in the time domain respectively to obtain first measurement data segments and second measurement data segments within multiple periods; Performing period-averaging processing on the first measurement data segments and the second measurement data segments respectively to obtain a first periodic fluctuation component template and a second periodic fluctuation component template respectively; Matching the first measurement data and the second measurement data of the current period with the first periodic fluctuation component template and the second periodic fluctuation component template respectively to obtain a first periodic fluctuation component and a second periodic fluctuation component.

[0009] According to a method for monitoring the movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, the first laser ranging module and the second laser ranging module are adjustably installed on the front bearing seat of the main shaft of the wind turbine through a magnetic adsorption type bracket.

[0010] According to a method for monitoring the movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, before correcting the first measurement data and the second measurement data based on the rotation period of the impeller locking disc, it further includes: Detect the abnormal conditions of 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 has an abnormality, based on the detection result of the axial movement of the main shaft by the other laser ranging module.

[0011] According to a method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, before detecting the abnormal conditions of the first laser ranging module and the second laser ranging module, it further includes: Perform noise reduction processing on the first measurement data and the second measurement data.

[0012] According to a method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, the installation axes of the first laser ranging module and the second laser ranging module form an asymmetric angle with the axis of the main shaft.

[0013] According to a method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention, after obtaining the detection result of the axial movement of the main shaft based on the data difference, it further includes: Generate corresponding protection measures based on the detection result of the axial movement.

[0014] On the other hand, the present invention also provides a device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging, including: A data acquisition module, configured to acquire first measurement data and second measurement data respectively 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 axially symmetrically arranged on the front bearing seat of the main shaft of the wind turbine and are used to measure the distance between them and the impeller locking disc; A data correction module, configured to correct the first measurement data and the second measurement data based on the rotation period of the impeller locking disc to obtain first corrected data and second corrected data; A calculation module, configured to calculate the data difference between the first corrected data and the second corrected data; An axial movement detection module, configured to obtain the detection result of the axial movement of the main shaft based on the data difference.

[0015] The method and device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention set two laser ranging modules on the front bearing seat of the main shaft, directly measure the distance change between the main shaft and the impeller locking disc, and correct the measurement data based on the rotation period of the impeller locking disc to remove periodic interference. Then, the difference value of the corrected data is calculated to accurately judge the type and direction of the axial movement of the main shaft, realizing high-precision and real-time monitoring of the axial movement of the main shaft, effectively improving the reliability and robustness of the monitoring system, reducing the possibility of misjudgment and missed judgment, and ensuring the safe operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic flowchart of the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by an embodiment of the present invention; Figure 2 is a schematic scenario diagram of the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of the device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0019] Figure 1 is a schematic flowchart of the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by an embodiment of the present invention. The execution subject of this method can be a field server.

[0020] See Figure 1 , the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging may include the following steps 101 to 104.

[0021] Step 101: Obtain 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 arranged on the front bearing seat of the main shaft of the wind turbine, and are used to measure the distance between them and the impeller locking disc.

[0022] In this step, the first laser ranging module and the second laser ranging module are a kind of high-precision measurement tools, which can measure the distance by emitting laser beams and receiving reflected light. The impeller locking disc is usually used to fix the impeller. By measuring the distance between the main shaft and the impeller locking 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 axially symmetrically arranged on the front bearing seat of the main shaft of the wind turbine.

[0023] Step 102: Based on the rotation period of the impeller locking disc, correct the first measurement data and the second measurement data to obtain the first corrected data and the second corrected data.

[0024] Step 102 may specifically include: Step 1: Perform time-domain synchronization analysis on the first measurement data and the second measurement data respectively, and extract the first periodic fluctuation component and the second periodic fluctuation component corresponding to the rotation period of the impeller locking disc for each; Step 2: Remove the first periodic fluctuation component and the second periodic fluctuation component corresponding to each from the first measurement data and the second measurement data to obtain the first corrected data and the second corrected data.

[0025] Among them, the above Step 1 may specifically include: Step 1: Obtain the rotation angle of the impeller locking disc; In this step, by obtaining the rotation angle of the impeller locking disc, its rotation period can be determined, and then the measurement data can be synchronously processed. Assuming that the rotation period of the impeller locking disc is 1 second (i.e., it rotates one circle per second), the rotation angle of the impeller locking disc can be obtained in real time through an angle sensor, and the angle range is from 0° to 360°.

[0026] Step 2: Based on the rotation angle as a reference, perform time-domain synchronous segmentation on the first measurement data and the second measurement data respectively according to the rotation period to obtain the first measurement data segments and the second measurement data segments within multiple periods; In this step, the first measurement data and the second measurement data are respectively segmented according to the rotation period of the impeller locking disc, ensuring that each data segment corresponds to a complete rotation period. The sampling frequencies of the first laser ranging module and the second laser ranging module determine how many data points can be obtained within each period. For example, if the sampling frequency of the laser ranging module is 10 times per second, then within a 1-second period, 10 data points will be generated. The rotation period of the impeller locking disc determines the time length of each period. If the impeller locking disc rotates one circle per second (i.e., the period is 1 second), then within 1 second, the laser ranging module will collect the corresponding number of data points according to its sampling frequency, that is, 10 data points per second.

[0027] Step 3: Perform period averaging processing on the first measurement data segment and the second measurement data segment respectively to obtain their respective first periodic fluctuation component templates and second periodic fluctuation component templates; In this step, assume that within a 1-second period, the laser ranging module will collect 10 data points. For 10 seconds, 10 periods will be experienced. For each period, the average value within that period can be calculated, and the average values of each period can be regarded as the corresponding periodic fluctuation component templates.

[0028] Step 4: Match the first measurement data and the second measurement data of the current period with their respective first periodic fluctuation component templates and second periodic fluctuation component templates respectively to obtain the first periodic fluctuation component and the second periodic fluctuation component; In this step, taking one period as an example, for example, selecting period 1, the original data of period 1 includes 100, 102, 101, 103, 102, 104, 103, 105, 104, 106; then the obtained periodic fluctuation component template is 103; the periodic fluctuation components are (100 - 103), (102 - 103), (101 - 103), (103 - 103), (102 - 103), (104 - 103), (103 - 103), (105 - 103), (104 - 103), (106 - 103), that is, -3, -1, -2, 0, -1, 1, 0, 2, 1, 3.

[0029] For the above step 2, still taking period 1 as an example, the original data includes 100, 102, 101, 103, 102, 104, 103, 105, 104, 106; the periodic fluctuation components are -3, -1, -2, 0, -1, 1, 0, 2, 1, 3; the corrected data is 103, 103, 103, 103, 103, 103, 103, 103, 103, 103.

[0030] In the above step 102, through time-domain synchronization analysis and periodic averaging processing, the periodic interference caused by the mechanical eccentricity of the impeller locking disc is effectively removed, improving the accuracy and reliability of the main shaft endplay monitoring. It has the characteristics of strong dynamic adaptability, high data stability, and strong robustness, and can provide high-quality data support for subsequent endplay result judgment and protection measures.

[0031] Step 103: Calculate the data difference between the first corrected data and the second corrected data.

[0032] In this step, the data difference is the result obtained by subtracting the second corrected data from the first corrected data.

[0033] Step 104: Obtain the endplay result of the main shaft based on the data difference.

[0034] In this embodiment, by setting two laser ranging modules on the front bearing housing of the main shaft, the distance change between the main shaft and the impeller locking disc is directly measured, and the measurement data is corrected based on the rotation period of the impeller locking disc to remove periodic interference. Then, the corrected data difference is calculated to accurately judge the type and direction of the main shaft endplay, realizing high-precision and real-time main shaft endplay monitoring, effectively improving the reliability and robustness of the monitoring system, reducing the possibility of misjudgment and missed judgment, and ensuring the safe operation of the wind turbine.

[0035] In an embodiment of this specification, obtaining the endplay result of the main shaft based on the data difference includes: If the data difference is less than the preset threshold and both the first corrected data and the second corrected data decrease, it is determined that the main shaft has axial endplay in the direction approaching the impeller locking disc; If the data difference is less than the preset threshold and both the first corrected data and the second corrected data increase, it is determined that the main shaft has axial endplay in the direction away from the impeller locking disc; If the data difference is greater than or equal to the preset threshold, it is determined that the main shaft has skewed endplay, and the direction of the skewed endplay is determined based on the first corrected data and the second corrected data.

[0036] In this embodiment, the preset threshold is a reference value for distinguishing axial endplay and skewed endplay, and 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 endplay of the main shaft is axial; if the difference is greater than or equal to the preset threshold, the endplay of the main shaft is skewed. By comparing the change trends of the first corrected data and the second corrected data, the direction of the skew can be further determined. For example, if the first corrected data decreases while the second corrected data increases, it indicates that the main shaft is skewed towards the first laser ranging module; if the first corrected data increases while the second corrected data decreases, it indicates that the main shaft is skewed towards the second laser ranging module.

[0037] In this embodiment, by setting a preset threshold and combining the data difference and the changing trend of the corrected data, the type (axial runout or skewed runout) and direction of the spindle runout can be accurately determined. This 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 the runout, potential problems caused by the spindle runout of the wind turbine can be more effectively prevented and handled, ensuring the safe operation of the wind turbine.

[0038] In an embodiment of this specification, the first laser ranging module and the second laser ranging module are adjustably mounted on the front bearing housing of the wind turbine spindle through a magnetic adsorption bracket.

[0039] In this embodiment, the magnetic adsorption bracket is a device that uses magnetic force to adsorb on the metal surface. The magnetic adsorption bracket can quickly adsorb on the front bearing housing of the wind turbine spindle without complex mechanical fixing devices, and the installation process is simple and fast. The magnetic adsorption bracket is usually designed to be adjustable, and the installation position and angle of the laser ranging module can be adjusted according to needs to ensure the accuracy and reliability of the measurement.

[0040] In an embodiment of this specification, before correcting the first measurement data and the second measurement data based on the rotation period of the impeller locking disk, it further includes: Detecting abnormal conditions of 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 has an abnormality, the runout result of the spindle is detected based on the other laser ranging module.

[0041] In this embodiment, the abnormal conditions may include loss or abnormal fluctuation of measurement data, hardware failures of the laser ranging module, etc. The abnormal conditions can be detected in the following ways. For example, data integrity check: checking whether the measurement data is continuous and whether there is data loss; data rationality check: analyzing whether the measurement data is within a reasonable range and whether there is abnormal fluctuation; self-check function: using the self-check function of the laser ranging module to detect whether the hardware is working properly. Detecting the runout result of the spindle based on the other laser ranging module means obtaining the distance between the spindle and the impeller locking disk according to the measurement data of the other laser ranging module, and judging whether the spindle runs out according to the size of the distance. For example, if the distance becomes smaller, it means running towards the impeller locking disk; if the distance becomes larger, it means running away from the impeller locking disk.

[0042] In an embodiment of this specification, before detecting the abnormal conditions of the first laser ranging module and the second laser ranging module, it further includes: Performing noise reduction processing on the first measurement data and the second measurement data.

[0043] In this embodiment, the noise reduction processing methods may include filtering, wavelet transform, data smoothing, etc. By performing noise reduction processing on the measurement data, the quality of the measurement data and the reliability of anomaly detection are significantly improved. It not only reduces misjudgments caused by environmental noise or equipment noise but also improves the accuracy of anomaly detection.

[0044] In an embodiment of this specification, the installation axes of the first laser ranging module and the second laser ranging module form an asymmetric angle with the spindle axis.

[0045] In this embodiment, the spindle axis is the center line of the spindle, assuming it is 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 axes of the two laser ranging modules and the spindle axis, then their installation is asymmetric. This asymmetric angle can be any angle. For example, the angle between the installation axis of the first laser ranging module and the spindle axis is 15°, and the angle between the installation axis of the second laser ranging module and the spindle axis is -15°.

[0046] In this embodiment, by setting the installation axes of the laser ranging modules to form an asymmetric angle with the spindle axis, not only the measurement blind area is reduced, but also the axial movement of the spindle can be detected more comprehensively, especially the skewed axial movement, which can significantly improve the accuracy and reliability of spindle axial movement monitoring.

[0047] In an embodiment of this specification, after obtaining the axial movement result of the spindle based on the data difference, it further includes: Generating corresponding protection measures based on the axial movement result.

[0048] In this embodiment, there can be various protection measures. For example, when it is monitored that the axial movement of the spindle exceeds the safety threshold, the system automatically triggers a shutdown procedure to stop the operation of the wind turbine to prevent further damage. By means of audible and visual alarms or remote notifications, maintenance personnel are reminded to check and handle in a timely manner. Adjust the operating parameters of the wind turbine according to the axial movement situation, such as reducing the speed, adjusting the load, etc., to reduce the burden on the spindle. By generating corresponding protection measures after monitoring the axial movement result of the spindle, the safety and reliability of the wind turbine can be significantly improved.

[0049] Figure 2 It is a schematic diagram of the scenario of the method for monitoring the axial movement of the spindle of a wind turbine based on laser ranging provided by an embodiment of the present invention. Refer to Figure 2, the impeller lock disk is used to connect the impeller. Two laser ranging sensors (i.e., the first laser ranging module and the second laser ranging module) are arranged on the front bearing housing of the main shaft, and each is used to measure the measured distance D1 (i.e., the first measurement data) and the measured distance D2 (i.e., the second measurement data). The collector can collect the measured distance D1 and the measured distance D2 through the RS485 interface, and then send them to the field server through the fan ring network. The field server performs the above-mentioned method for monitoring the axial movement of the main shaft of the wind turbine based on laser ranging on the measured distance D1 and the measured distance D2.

[0050] Based on the same general inventive concept, the present invention also protects a device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging, as Figure 3 shown, Figure 3 is a schematic structural diagram of the device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by an embodiment of the present invention. The device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging provided by the present invention will be described below. The device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging described below can be mutually corresponding and referred to the method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging described above.

[0051] The device for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging includes a data acquisition module 301, a data correction module 302, a calculation module 303, and a creep detection module 304.

[0052] The data acquisition module 301 is used to acquire the first measurement data and the second measurement data respectively collected by the first laser ranging module and the second laser ranging module; wherein, the first laser ranging module and the second laser ranging module are axially symmetrically arranged on the front bearing housing of the main shaft of the wind turbine, and are used to measure the distance between them and the impeller lock disk; The data correction module 302 is used to correct the first measurement data and the second measurement data based on the rotation period of the impeller lock disk to obtain the first corrected data and the second corrected data; The calculation module 303 is used to calculate the data difference between the first corrected data and the second corrected data; The creep detection module 304 is used to obtain the creep result of the main shaft based on the data difference.

[0053] Figure 4 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0054] As Figure 4As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440. Among them, the processor 410, the communications interface 420, and the memory 430 communicate with each other via the communication bus 440. The processor 410 may invoke the logical instructions in the memory 430 to execute the method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging.

[0055] In addition, when the logical instructions in the above-mentioned memory 430 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0056] On the other hand, the present invention also provides a computer program product. The computer program product 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 can execute the method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging provided by the above-mentioned various methods.

[0057] On yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging provided by the above-mentioned various methods.

[0058] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0059] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some 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 invention.

Claims

1. A method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging, characterized in that, Including: 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 main shaft of a wind turbine, and are used to measure the distance between the main shaft and the impeller locking disc; Based on the rotation period of the impeller locking disc, correcting the first measurement data and the second measurement data to obtain first corrected data and second corrected data; Calculating the data difference between the first corrected data and the second corrected data; Based on the data difference, obtaining the axial movement result of the main shaft.

2. The method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging according to claim 1, wherein The obtaining the axial movement result of the main shaft 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, it is determined that the main shaft has axial movement in the direction approaching the impeller locking disc; If the data difference is less than a preset threshold, and both the first corrected data and the second corrected data increase, it is determined that the main shaft has axial movement in the direction away from the impeller locking disc; If the data difference is greater than or equal to the preset threshold, it is determined that the main shaft has skew axial movement, and the direction of the skew axial movement is determined based on the first corrected data and the second corrected data.

3. The method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging according to claim 1, wherein The correcting the first measurement data and the second measurement data based on the rotation period of the impeller locking disc to obtain first corrected data and second corrected data includes: Performing time-domain synchronous analysis on the first measurement data and the second measurement data respectively, and extracting a first periodic fluctuation component and a second periodic fluctuation component corresponding to the rotation period of the impeller locking disc respectively; Removing the first periodic fluctuation component and the second periodic fluctuation component corresponding to each of the first measurement data and the second measurement data from the first measurement data and the second measurement data respectively to obtain first corrected data and second corrected data.

4. The method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging according to claim 3, wherein The performing time-domain synchronous analysis on the first measurement data and the second measurement data respectively, and extracting the first periodic fluctuation component and the second periodic fluctuation component corresponding to the rotation period of the impeller locking disc respectively includes: Obtaining the rotation angle of the impeller locking disc; Taking the rotation angle as a reference, respectively performing time-domain synchronous segmentation on the first measurement data and the second measurement data according to the rotation period to obtain first measurement data segments and second measurement data segments within multiple periods; Performing period average processing on the first measurement data segments and the second measurement data segments respectively to obtain a first periodic fluctuation component template and a second periodic fluctuation component template of each; Matching the first measurement data and the second measurement data of the current period with the first periodic fluctuation component template and the second periodic fluctuation component template of each respectively to obtain a first periodic fluctuation component and a second periodic fluctuation component.

5. The method for monitoring the axial displacement of the main shaft 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 adjustably installed on the front bearing seat of the main shaft of the wind turbine through a magnetic adsorption type bracket.

6. The method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging according to claim 1, wherein Before the correcting the first measurement data and the second measurement data based on the rotation period of the impeller locking disc, it further includes: Detecting the abnormal conditions of 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 is abnormal, the axial movement result of the main shaft is detected based on the other laser ranging module.

7. The method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging according to claim 6, wherein Before detecting the abnormal conditions of the first laser ranging module and the second laser ranging module, it further includes: Performing noise reduction processing on the first measurement data and the second measurement data.

8. The method for monitoring the axial movement of the main shaft of a wind turbine based on laser ranging according to claim 1, wherein The installation axes of the first laser ranging module and the second laser ranging module form an asymmetric angle with the axis of the main shaft.

9. The method for monitoring the axial displacement of the main shaft of a wind turbine based on laser ranging according to claim 1, wherein After obtaining the axial movement result of the main shaft based on the data difference, it further includes: Generating corresponding protection measures based on the axial movement result.

10. A monitoring device for the axial movement of the main shaft of a wind turbine based on laser ranging, characterized in that, It includes: A data acquisition module, configured to acquire first measurement data and second measurement data respectively collected by the first laser ranging module and the second laser ranging module; wherein, the first laser ranging module and the second laser ranging module are axially symmetrically arranged on the front bearing housing of the main shaft of the wind turbine, and are used to measure the distance between them and the impeller locking disc; A data correction module, configured to correct the first measurement data and the second measurement data based on the rotation period of the impeller locking disc to obtain first corrected data and second corrected data; A calculation module, configured to calculate the data difference between the first corrected data and the second corrected data; An axial movement detection module, configured to obtain the axial movement result of the main shaft based on the data difference.

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