Auxiliary detection device for end face of main shaft of wind turbine generator and use method of auxiliary detection device

Abstract

The invention belongs to the technical field of wind turbine generator detection equipment, and relates to a wind turbine generator main shaft end face auxiliary detection device and a use method thereof. Comprising a fixing device, a probe, a rolled metal wire, a metal wire length measuring device, a wireless linear distance measuring device, a circulating detection unit and a positioning unit, the fixing device is arranged on the end face of a main shaft of the wind turbine generator, and the probe is connected with the fixing device through a rolled metal wire; the metal wire length measuring device is arranged on the fixing device and is in transmission connection with the rolled metal wire; the wireless linear distance measuring device comprises a first wireless signal module and a second wireless signal module, the first wireless signal module is arranged on the fixing device, and the second wireless signal module is arranged on the probe; according to the invention, controllable planning of a detection path and accurate anti-interference positioning of a probe position are realized, and the defect detection rate, the positioning accuracy and the reliability of a detection result are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the technical field of wind turbine testing equipment, and relates to an auxiliary detection device for the main shaft end face of a wind turbine and its usage method. Background Technology

[0002] As the core component for transmitting wind energy to the generator set, the wind turbine's main shaft is subjected to complex loads such as alternating torque, mechanical vibration, and environmental corrosion over long periods. Its end face is prone to defects such as fatigue cracks and wear on the sealing surface, seriously affecting the unit's operational safety and lifespan. Currently, the industry typically uses non-destructive testing methods such as ultrasonic testing and magnetic particle testing to periodically evaluate the main shaft end face in order to identify potential defects and prevent structural failures.

[0003] However, the spindle end face has a complex structure, typically integrating multiple functional components such as speed sensors, electrical control junction boxes, and hydraulic pipeline interfaces. These devices are scattered, obstructing 30% to 50% of the area, dividing the inspection area into several discontinuous and isolated sections, significantly increasing the difficulty of the inspection operation. In actual manual inspection, operators must move the probe handheld through the gaps in the obstruction. Due to physical obstacles and fatigue from prolonged operation, the probe's movement trajectory is highly random and inconsistent, making it difficult to systematically cover all areas to be inspected (especially the edges of obstructions and narrow gaps), resulting in a missed detection rate generally exceeding 20%.

[0004] Furthermore, traditional detection methods lack high-precision ranging and positioning aids, making it impossible to record the relative position information of the probe path and defects in real time. During subsequent re-inspections or defect tracking, it is difficult to reproduce the initial detection trajectory, severely impacting the accuracy of quantitative analysis and diagnosis of defect initiation and expansion trends. Moreover, the main shaft end face of wind turbines is often located inside the high-altitude nacelle, where space is narrow and the environment is cramped. During manual operation, the probe is prone to slipping due to unstable grip, potentially damaging precision equipment and posing additional workplace safety risks.

[0005] Currently available non-destructive testing (NDT) auxiliary devices (such as scanning frames or mechanical guides) are mostly designed for planar or simple curved surfaces, failing to consider the special structural environment of high obstruction and multiple obstacles on the main shaft end face. Their ranging modules are easily affected by on-site debris, resulting in low positioning accuracy. Furthermore, they lack effective trajectory constraints and adaptive path planning mechanisms, making it impossible to achieve full coverage and high repeatability of the testing process. Consequently, they cannot meet the urgent requirements of wind turbine main shaft condition monitoring for testing accuracy and reliability. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems in the existing technology of wind turbine main shaft end face detection, such as trajectory loss, ranging failure, and incomplete coverage caused by obstruction by debris. It provides an auxiliary detection device for wind turbine main shaft end face and its usage method to achieve high-precision, full-coverage, safe and convenient detection of defects such as cracks and wear on the wind turbine main shaft end face.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an auxiliary detection device for the end face of the main shaft of a wind turbine, comprising a fixing device, a probe, a wound metal wire, a metal wire length measuring device, a wireless linear distance measuring device, a cyclic detection unit, and a positioning unit; The fixing device is mounted on the end face of the wind turbine main shaft, and the probe is connected to the fixing device via a wound metal wire; the metal wire length measuring device is mounted on the fixing device and is connected to the wound metal wire in a driving connection; the wireless linear distance measuring device includes a first wireless signal module and a second wireless signal module, the first wireless signal module is mounted on the fixing device, and the second wireless signal module is mounted on the probe; The cycle detection unit includes a servo motor, an encoder, and a tension sensor. The servo motor and the encoder are both located inside the fixing device. The servo motor is connected to the winding wheel of the winding metal wire. The encoder is coaxially connected to the rotating shaft of the winding wheel via a coupling. The tension sensor is embedded in the fixed end of the winding metal wire located inside the fixing device. The positioning unit includes a laser ranging device and an inertial measurement device. The laser ranging device is disposed on the side wall of the probe, and the inertial measurement device is disposed inside the probe.

[0008] Preferably, the fixing device is a magnetic fixing device, which has a permanent magnet chuck at its bottom; the fixing device is fixed to the end face of the main shaft of the wind turbine by the permanent magnet chuck.

[0009] Preferably, a rubber pad is provided between the permanent magnet chuck and the end face of the wind turbine main shaft.

[0010] Preferably, the fixing device has a winding cavity inside; the winding cavity is equipped with a damped automatic winding mechanism; one end of the winding metal wire is wound and fixed on the winding wheel of the automatic winding mechanism.

[0011] Preferably, the probe end is provided with a metal wire connecting buckle; the other end of the wound metal wire is connected to the metal wire connecting buckle.

[0012] Preferably, the probe's outer shell surface is provided with a gripping part composed of anti-slip texture.

[0013] Preferably, the wire length measuring device includes a gear set coaxially connected to the winding wheel and a scale connected to the gear set.

[0014] Preferably, the coiled metal wire is spring steel wire, and its surface is coated with an anti-corrosion layer.

[0015] Preferably, the detection surface of the probe is adapted to the flatness of the end face of the main shaft of the wind turbine, and the flatness of the detection surface of the probe is not greater than 0.1 mm / m.

[0016] Secondly, the present invention provides a method for using an auxiliary detection device for the main shaft end face of a wind turbine, comprising the following steps: S1. Attach the fixing device to the center reference position of the wind turbine main shaft end face; S2. Start the cyclic detection unit and set the target tension value of the wound metal wire; hold the probe and pull it outward. The servo motor provides reverse damping under the control of the controller, so that the wound metal wire extends smoothly under constant tension; according to the extension length displayed by the metal wire length measuring device and the rotation angle of the winding wheel fed back by the encoder, move the probe to the starting point of the circumferential trajectory of the predetermined radius. S3. Under the tension constraint of the wound metal wire, the probe moves along a circular trajectory to detect the end face of the wind turbine main shaft. During this process, the wireless linear distance measuring device measures the linear distance between the probe and the fixed device in real time. At the same time, the laser ranging device of the positioning unit detects the lateral distance between the probe and surrounding obstacles in real time, and the inertial measurement device monitors the motion acceleration and angular velocity of the probe in real time. S4. Based on the combined data of the extended length of the coiled metal wire, the straight distance measured by the wireless straight distance measuring device, the lateral distance measured by the laser rangefinder, and the data from the inertial measurement device, determine the position coordinates of the probe on the end face of the wind turbine main shaft, and record the coordinates in association with the detection data acquired at this time. S5. After completing the current circumferential trajectory detection, release or tighten the wound metal wire, change the trajectory radius, repeat steps S3-S4, and perform circumferential trajectory detection for the next radius until the full coverage detection of the wind turbine main shaft end face is completed. S6. After the test is completed, release the probe and control the servo motor to reverse so that the wound metal wire is automatically retracted into the fixing device.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By setting up a cyclic detection unit and utilizing the synergistic effect of servo motors, encoders, and tension sensors, active damping control and constant tension maintenance during the wire winding process are achieved, ensuring the smoothness of probe movement and trajectory consistency. By adding a positioning unit and integrating laser ranging and inertial measurement devices, the probe's position and posture perception and lateral obstacle avoidance capabilities in complex environments are enhanced, effectively avoiding measurement deviations caused by obstruction and operational instability. Through the organic combination of fixing devices, wire winding metal wires, and dual-mode ranging units, a composite positioning system based on mechanical constraints and with wireless ranging as a redundancy check is constructed. This fundamentally overcomes the technical bottlenecks of random trajectory, inaccurate positioning, and susceptibility to obstruction in traditional detection, significantly improving the coverage, accuracy, and reliability of detection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the auxiliary detection device for the main shaft end face of the wind turbine of the present invention.

[0020] The components include: 1. Fixing device; 2. Probe; 3. Winding metal wire; 4. Metal wire length measuring device; 5. Wireless linear distance measuring device; 51. First wireless signal module; 52. Second wireless signal module; 6. Automatic winding mechanism. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide an auxiliary detection device for the end face of the main shaft of a wind turbine, such as... Figure 1 As shown, it includes a fixing device 1, a probe 2, a wound metal wire 3, a metal wire length measuring device 4, a wireless linear distance measuring device 5, a cyclic detection unit, and a positioning unit; The fixing device 1 is mounted on the end face of the main shaft of the wind turbine. The probe 2 is connected to the fixing device 1 via a wound metal wire 3. The metal wire length measuring device 4 is mounted on the fixing device 1 and is connected to the wound metal wire 3 in a driving connection. The wireless linear distance measuring device 5 includes a first wireless signal module 51 and a second wireless signal module 52. The first wireless signal module 51 is mounted on the fixing device 1, and the second wireless signal module 52 is mounted on the probe 2. The cycle detection unit includes a servo motor, an encoder, and a tension sensor. The servo motor and the encoder are both located inside the fixing device 1. The servo motor is connected to the winding wheel of the winding metal wire 3. The encoder is coaxially connected to the rotating shaft of the winding wheel through a coupling. The tension sensor is embedded in the fixed end of the winding metal wire 3 located inside the fixing device 1. The positioning unit includes a laser ranging device and an inertial measurement device. The laser ranging device is disposed on the side wall of the probe 2, and the inertial measurement device is disposed inside the probe 2.

[0028] This invention establishes a stable detection benchmark through a fixing device 1, and guides the probe 2 along a predetermined circumferential trajectory using the mechanical constraint of the wound metal wire 3. This mechanism avoids missed detections caused by environmental obstructions and human error, ensuring the systematic nature and full coverage of the detection path. The combination of metal wire length measurement and wireless linear distance measurement forms a redundant spatial positioning mechanism, effectively overcoming signal obstruction problems caused by non-metallic debris and achieving accurate and interference-resistant probe positioning. Simultaneously, the cyclic detection unit, through the integration of a servo motor, encoder, and tension sensor, achieves active control and precise tension adjustment of the winding process, ensuring the smoothness and trajectory consistency of the probe 2's movement. The positioning unit, utilizing laser ranging and inertial measurement units, further enhances the probe 2's pose perception and obstacle avoidance capabilities in complex environments, improving the safety and adaptability of the detection process. This invention, through multi-source information fusion and mechatronics control, significantly improves the reliability, accuracy, and efficiency of wind turbine main shaft end face defect detection, providing a solid data foundation for subsequent defect assessment and lifespan prediction.

[0029] The fixing device 1 is a magnetic fixing device with a permanent magnet chuck (with an adsorption force of 80~150N) at its bottom. Fixing device 1 is fixed to the end face of the wind turbine main shaft via the permanent magnet chuck, achieving quick installation and secure fixation. Simultaneously, a rubber pad is provided between the permanent magnet chuck and the end face of the wind turbine main shaft. On one hand, the rubber pad, through elastic deformation, fills the microscopic unevenness between the chuck and the main shaft end face, increasing the effective contact area and making the adsorption force distribution more uniform, avoiding magnetic force attenuation caused by localized stress concentration. On the other hand, it effectively prevents scratches or wear on the main shaft end face, thereby protecting the integrity and precision of the main shaft surface and extending the service life of the equipment.

[0030] The fixing device 1 has a winding cavity inside; a damped automatic winding mechanism 6 is installed inside the winding cavity; one end of the winding metal wire 3 is wound and fixed on the winding wheel of the automatic winding mechanism 6, and the other end is connected to the metal wire connecting buckle at the end of the probe 2. Through the built-in damped automatic winding mechanism 6, a continuous and stable tension can be provided to the winding metal wire 3 (keeping the metal wire tension at 5~10N), ensuring that the trajectory of the probe 2 is smooth and controllable during movement, and avoiding the metal wire from becoming loose or overly tight; the end of the probe 2 is reliably connected to the metal wire through a special connecting buckle, which not only ensures the stability and safety of the transmission connection and prevents the probe 2 from accidentally falling off, but also makes the disassembly and operation of the probe 2 more convenient and flexible, greatly improving the detection efficiency.

[0031] In addition, the outer shell of probe 2 is provided with a grip area made of anti-slip texture, which enhances the friction when the operator holds probe 2. Even in complex working conditions such as wetness and oil, it can effectively prevent probe 2 from slipping or slipping out of the hand, thereby ensuring the continuity and stability of the detection process, while reducing the risk of equipment damage due to accidental drops, and improving the safety and human-machine efficiency of operation.

[0032] For example, the wire length measuring device 4 includes a gear set coaxially connected to the winding wheel and a scale (measurement accuracy ±1mm) connected to the gear set. The gear set can accurately convert the straight extension of the wire into the number of rotations and display the length value intuitively through the scale. It provides real-time and accurate feedback on the current trajectory radius of the probe 2, providing operators with a reliable length basis and ensuring the controllability and repeatability of the detection trajectory.

[0033] For example, the coiled metal wire 3 is a high-strength spring steel wire, which can withstand repeated winding and stretching without easily undergoing plastic deformation or breakage. Furthermore, the surface of the coiled metal wire 3 is coated with an anti-corrosion layer, which effectively isolates it from corrosive media such as moisture and salt spray, significantly improving its durability and service life in harsh environments, thereby ensuring the long-term reliability and measurement stability of the entire detection device.

[0034] For example, the wireless linear distance measuring device 5 adopts a UWB ultra-wideband wireless module. With its high ranging accuracy of ±3mm, the UWB ultra-wideband wireless module can accurately calculate the spatial position of the probe, providing a reliable data foundation for defect location. Its communication distance of not less than 3m and excellent non-metallic penetration ability can effectively overcome the signal attenuation and measurement blind spots caused by obstructions such as electrical control devices and junction boxes on the spindle end face, ensuring stable and continuous long-distance ranging even in complex environments, and significantly improving the reliability of detection data and full-area coverage.

[0035] For example, the detection surface of probe 2 is adapted to the flatness of the end face of the wind turbine main shaft, and the flatness of the detection surface of probe 2 is no greater than 0.1 mm / m. This design ensures that probe 2 achieves full and uniform coupling with the surface being measured, effectively reducing signal attenuation or interference caused by poor contact.

[0036] Example An auxiliary detection device for the end face of a wind turbine main shaft includes a fixing device 1, a probe 2, a wound metal wire 3, a metal wire length measuring device 4, a wireless linear distance measuring device 5, a cyclic detection unit, and a positioning unit. The fixing device 1 is disposed on the end face of the wind turbine main shaft, and the probe 2 is connected to the fixing device 1 through the wound metal wire 3. The metal wire length measuring device 4 is disposed on the fixing device 1 and is drivenly connected to the wound metal wire 3. The wireless linear distance measuring device 5 includes a first wireless signal module 51 and a second wireless signal module 52. The first wireless signal module 51 is disposed on the fixing device 1, and the second wireless signal module 52 is disposed on the probe 2. The cycle detection unit includes a servo motor, an encoder, and a tension sensor. The servo motor and the encoder are both located inside the fixed device 1. The servo motor is connected to the winding wheel of the winding metal wire 3. The encoder is coaxially connected to the rotating shaft of the winding wheel through a coupling. The tension sensor is embedded in the fixed end of the winding metal wire 3 located inside the fixed device 1. The positioning unit includes a laser rangefinder and an inertial measurement unit. The laser rangefinder is located on the side wall of the probe 2, and the inertial measurement unit is located inside the probe 2.

[0037] The fixing device 1 is a cylindrical shell structure with a diameter of 60mm and a height of 40mm, made of aluminum alloy. A neodymium iron boron permanent magnet chuck with a diameter of 50mm is installed at its bottom. The chuck provides an adsorption force of 100N, which can ensure that the device remains firmly adsorbed on the spindle end face with a 30° inclination and does not fall off. A 1mm thick rubber pad is attached between the chuck and the spindle end face to avoid direct contact with the spindle surface and prevent scratches.

[0038] The fixing device 1 has a wire winding cavity inside, and an automatic wire winding mechanism 6 is installed inside the cavity. The wire winding metal wire 3 is made of 65Mn spring steel wire with a diameter of 0.8mm and a tensile strength of not less than 1800MPa. The surface is galvanized for corrosion protection and can pass a salt spray test of not less than 1000 hours. One end of the metal wire is fixed to the winding wheel of the automatic wire winding mechanism 6, and the other end is connected to the probe 2 through a metal wire connecting buckle. Its maximum extension length is 2m, which can meet the detection requirements of the end face of the spindle with a diameter of up to 4m.

[0039] The wire length measuring device 4 includes a gear set and a dial connected to the gear set. The gear set has a transmission ratio of 1:10 and is coaxially connected to the wire winding wheel. The dial updates its reading every 1mm as the wire extends, with a measurement accuracy of ±1mm. It displays the wire extension length in real time, allowing operators to directly read the current trajectory radius.

[0040] The outer shell of probe 2 has a grip area with anti-slip texture on its surface, and the grip area is 100mm long to enhance stability and safety during operation. The end of probe 2 is integrated with a metal wire connector with a tensile strength of not less than 500N.

[0041] The second objective of this invention is to provide a method for using an auxiliary detection device for the main shaft end face of a wind turbine generator, comprising the following steps: S1. Fix the fixing device 1 to the center reference position of the main shaft end face of the wind turbine; S2. Start the cycle detection unit and set the target tension value of the wound metal wire 3; hold the probe 2 and pull it outward. The servo motor provides reverse damping under the control of the controller, so that the wound metal wire 3 extends smoothly under constant tension; according to the extension length displayed by the metal wire length measuring device 4 and the rotation angle of the winding wheel fed back by the encoder, move the probe 2 to the starting point of the circumferential trajectory of the predetermined radius. S3. Under the tension constraint of the coiled metal wire 3, the probe 2 moves along the circumferential trajectory to detect the end face of the wind turbine main shaft. During this process, the wireless linear distance measuring device 5 measures the linear distance between the probe 2 and the fixed device 1 in real time. At the same time, the laser range measuring device of the positioning unit detects the lateral distance between the probe 2 and the surrounding obstacles in real time, and the inertial measurement device monitors the motion acceleration and angular velocity of the probe 2 in real time. S4. Based on the combined data of the extended length of the coiled metal wire 3, the straight distance measured by the wireless straight distance measuring device 5, the lateral distance measured by the laser rangefinder, and the data from the inertial measurement device, determine the position coordinates of the probe 2 on the end face of the wind turbine main shaft, and record the coordinates in association with the detection data acquired at this time. S5. After completing the current circumferential trajectory detection, release or tighten the coiled metal wire 3, change the trajectory radius, repeat steps S3-S4, and perform circumferential trajectory detection for the next radius until the full coverage detection of the wind turbine main shaft end face is completed. S6. After the test is completed, release probe 2, control the servo motor to reverse, and automatically retract the wound metal wire 3 into the fixing device 1.

[0042] The method for using the auxiliary detection device for the main shaft end face of a wind turbine provided by this invention achieves high-precision, full-coverage detection of defects on the main shaft end face under complex obstruction environments through multi-sensor collaborative positioning and adaptive path planning. This invention employs a quadruple positioning data fusion technology: a reference radius is provided by measuring the length of the wound metal wire; wireless linear distance measurement penetrates non-metallic obstacles to obtain direct distance data; laser ranging monitors the lateral distance between the probe and surrounding structures in real time; an inertial measurement unit compensates for probe motion deviation; and the four types of data are fused through Kalman filtering to construct a dynamic coordinate system, controlling the probe position error to the millimeter level. During probe movement, when laser ranging detects an approaching obstacle, the system automatically adjusts the wound wire tension and combines it with inertial data to generate an obstacle-avoidance trajectory, ensuring a continuous detection path. All detection data establishes a polar-to-rectangular coordinate transformation model with the fixed device as the origin, and a multi-dimensional verification mechanism ensures the defect coordinate reproduction accuracy reaches ±1mm. Simultaneously, the servo motor adjusts the wound wire speed in real time based on tension feedback to ensure smooth probe movement, and the switching of the detection path radius is automatically calculated by the controller to achieve the optimal coverage spacing. Compared with existing technologies, this method overcomes the limitations of mechanical positioning in highly obstructed environments, reduces the false negative rate and improves detection efficiency, providing a highly reliable solution for the confined space detection of wind turbine main shafts and other complex industrial equipment.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary detection device for the end face of a wind turbine main shaft, characterized in that, Includes a fixing device (1), a probe (2), a wound metal wire (3), a metal wire length measuring device (4), a wireless linear distance measuring device (5), a cyclic detection unit, and a positioning unit; The fixing device (1) is located on the end face of the main shaft of the wind turbine. The probe (2) is connected to the fixing device (1) via a wound metal wire (3). The metal wire length measuring device (4) is located on the fixing device (1) and is connected to the wound metal wire (3) in a transmission manner. The wireless linear distance measuring device (5) includes a first wireless signal module (51) and a second wireless signal module (52). The first wireless signal module (51) is located on the fixing device (1), and the second wireless signal module (52) is located on the probe (2). The cycle detection unit includes a servo motor, an encoder, and a tension sensor. The servo motor and the encoder are both located inside the fixing device (1). The servo motor is connected to the winding wheel of the winding metal wire (3). The encoder is coaxially connected to the rotating shaft of the winding wheel through a coupling. The tension sensor is embedded in the fixed end of the winding metal wire (3) located inside the fixing device (1). The positioning unit includes a laser ranging device and an inertial measurement device. The laser ranging device is disposed on the side wall of the probe (2); the inertial measurement device is disposed inside the probe (2).

2. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 1, characterized in that, The fixing device (1) is a magnetic fixing device with a permanent magnet chuck at its bottom; the fixing device (1) is fixed to the end face of the main shaft of the wind turbine through the permanent magnet chuck.

3. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 2, characterized in that, A rubber pad is provided between the permanent magnet chuck and the end face of the wind turbine main shaft.

4. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 1, characterized in that, The fixing device (1) has a winding cavity inside; the winding cavity is equipped with an automatic winding mechanism (6) with damping; one end of the winding metal wire (3) is wound and fixed on the winding wheel of the automatic winding mechanism (6).

5. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 4, characterized in that, The probe (2) has a metal wire connector at one end; the other end of the wound metal wire (3) is connected to the metal wire connector.

6. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 5, characterized in that, The probe (2) has a grip part with anti-slip texture on its outer shell surface.

7. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 4, characterized in that, The wire length measuring device (4) includes a gear set coaxially connected to the winding wheel and a scale connected to the gear set.

8. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 1, characterized in that, The coiled metal wire (3) is a spring steel wire, and its surface is coated with an anti-corrosion layer.

9. The auxiliary detection device for the main shaft end face of a wind turbine according to claim 1, characterized in that, The detection surface of the probe (2) is adapted to the flatness of the end face of the main shaft of the wind turbine, and the flatness of the detection surface of the probe (2) is not greater than 0.1 mm / m.

10. The method of using the auxiliary detection device for the main shaft end face of a wind turbine according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Fix the fixing device (1) to the center reference position of the main shaft end face of the wind turbine; S2. Start the cycle detection unit and set the target tension value of the wound metal wire (3); hold the probe (2) and pull it outward. The servo motor provides reverse damping under the control of the controller, so that the wound metal wire (3) extends smoothly under constant tension; according to the extension length displayed by the metal wire length measuring device (4) and the rotation angle of the winding wheel fed back by the encoder, move the probe (2) to the starting point of the circumferential trajectory of the predetermined radius. S3. Under the tension constraint of the coiled metal wire (3), the probe (2) moves along the circumferential trajectory to detect the end face of the wind turbine main shaft. During this process, the wireless linear distance measuring device (5) measures the linear distance between the probe (2) and the fixed device (1) in real time. At the same time, the laser ranging device of the positioning unit detects the lateral distance between the probe (2) and the surrounding obstacles in real time, and the inertial measurement device monitors the motion acceleration and angular velocity of the probe (2) in real time. S4. Based on the combined data of the extended length of the coiled metal wire (3), the straight distance measured by the wireless straight distance measuring device (5), the lateral distance measured by the laser range measuring device, and the data of the inertial measuring device, determine the position coordinates of the probe (2) on the end face of the wind turbine main shaft, and record the coordinates in association with the detection data obtained at this time. S5. After completing the current circumferential trajectory detection, release or tighten the coiled metal wire (3), change the trajectory radius, repeat steps S3-S4, and perform the circumferential trajectory detection of the next radius until the full coverage detection of the wind turbine main shaft end face is completed. S6. After the test is completed, release the probe (2), control the servo motor to reverse, and automatically retract the coiled metal wire (3) into the fixing device (1).

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