Shaft detection device

Abstract

The application provides a shaft detection device, and relates to the technical field of nondestructive testing of wind turbine generators. The shaft detection device comprises a length-adjustable stepping shaft, a shaft center sleeve ring is installed at the first end of the stepping shaft, the shaft center sleeve ring is configured to be sleeved on the shaft end surface of a shaft to be detected, and the stepping shaft is rotationally connected to the shaft center sleeve ring through the shaft center sleeve ring; and a phased array ultrasonic probe is slidably connected to the stepping shaft along the axial direction of the stepping shaft. In the shaft detection device, the scanning area of the phased array ultrasonic probe is an annular area, and a detection personnel can determine whether the echo signal belongs to an inherent structure signal or a defect signal according to the structure of the shaft to be detected, thereby improving the detection accuracy of the shaft to be detected; and in the process of axial movement of the phased array ultrasonic probe on the stepping shaft, the adjacent annular scanning areas of the phased array ultrasonic probe have an overlapping area, which can ensure comprehensive scanning of the shaft end surface.

Description

Technical Field

[0001] This invention relates to the field of non-destructive testing technology for wind turbine generators, and more specifically, to a shaft testing device. Background Technology

[0002] Wind turbines are systems that convert wind energy into electrical energy. They mainly consist of components such as a wind turbine, generator, turbine, tower, energy storage device, steering mechanism, and speed limiter. Among these, the main shaft driving the wind turbine, the generator shaft, and the turbine shaft are all large shafts with significant diameters. The strength and precision of these large shafts directly determine whether the corresponding components can operate normally. Therefore, regular inspection of internal defects in these large shafts is crucial. In existing technologies, internal defects are typically detected by manually ultrasonically scanning the end face of the large shaft. However, manual ultrasonic scanning cannot ensure that the probe's movement trajectory is circular, making it difficult to determine whether the echo signal is an inherent structural signal or a defect signal, resulting in poor detection accuracy. Furthermore, the scanned area is prone to missed areas, leading to poor overall detection coverage. Summary of the Invention

[0003] The purpose of this invention is to provide a shaft detection device to solve the technical problem of poor accuracy and comprehensiveness in the detection of large shafts in wind turbine units in the prior art.

[0004] To address the aforementioned problems, this invention provides a shaft detection device for detecting large shafts in wind turbine units. The device includes an adjustable-length stepper shaft. A shaft center collar is mounted at the first end of the stepper shaft. The shaft center collar is configured as a shaft center component fitted onto the end face of the shaft to be tested, and the stepper shaft is rotatably connected to the shaft center component via the shaft center collar. A phased-array ultrasonic probe is slidably connected to the stepper shaft along its axial direction.

[0005] Optionally, the stepper axis is a telescopic axis;

[0006] Alternatively, the stepper axis may include multiple detachably connected shaft segments along its length.

[0007] Optionally, the shaft collar includes a first half-ring and a second half-ring, the first half-ring being fixed to the first end of the stepper shaft, and the second half-ring being detachably connected to the first half-ring;

[0008] Alternatively, the first end of the stepper shaft is provided with a hinge shaft, the first end of the first half ring and the first end of the second half ring are hinged through the hinge shaft, and the second end of the first half ring and the second end of the second half ring are detachably connected.

[0009] Optionally, the second end of the stepper shaft is pivotally connected to an end support wheel, the axial direction of the end support wheel being consistent with the axial direction of the stepper shaft; the stepper shaft is equipped with a rotary drive component, the drive end of the rotary drive component being connected to the end support wheel and configured to drive the end support wheel to rotate circumferentially.

[0010] Optionally, the stepper axis is equipped with an axial drive component, the drive end of which is connected to the phased array ultrasonic probe for driving the phased array ultrasonic probe to move along the axial direction of the stepper axis.

[0011] Optionally, the shaft detection device further includes a controller, and the phased array ultrasonic probe, the circumferential drive component, and the axial drive component are all connected to the controller.

[0012] Optionally, the shaft detection device further includes a controller and a fixing ring that matches the shaft to be tested. The fixing ring is configured to be sleeved on the shaft to be tested and fixedly installed. The fixing ring has a connecting part, and the second end of the stepper shaft can be detachably connected to the connecting part. When the second end of the stepper shaft is connected to the connecting part, the axial direction of the stepper shaft is consistent with the radial direction of the fixing ring.

[0013] The stepper axis is equipped with an axial drive component, the drive end of which is connected to the phased array ultrasonic probe and is used to drive the phased array ultrasonic probe to move along the axial direction of the stepper axis; the axial drive component is connected to the controller.

[0014] Optionally, the shaft detection device further includes a positioning magnet, which matches the shaft center collar and is configured to magnetically adhere to the center of the shaft end face of the shaft to be tested as the shaft center component.

[0015] Optionally, the shaft detection device further includes an arc-shaped positioning seat, which includes a vertically arranged end plate and an arc-shaped plate. The radius of the connecting arc between the end plate and the concave side of the arc-shaped plate is equal to the shaft radius of the shaft to be tested. The arc-shaped positioning seat is rotatably connected to the shaft center collar via a pivot shaft. The pivot shaft is detachably connected to the shaft center collar, and the axis of the pivot shaft coincides with the axis of the shaft center collar and intersects with the connecting arc.

[0016] Optionally, the shaft detection device further includes a carrier and a slider disposed on the carrier. The stepper shaft is provided with a groove extending along its axial direction. The groove opening width is smaller than the groove body width. The slider is slidably engaged with the groove. The phased array ultrasonic probe is mounted on the carrier.

[0017] Optionally, one of the inner wall of the groove and the outer wall of the slider is provided with a first limiting member, and the other is provided with a plurality of second limiting members. The plurality of second limiting members are evenly spaced along the extension direction of the corresponding wall surface, and the distance between two adjacent second limiting members is less than the scanning width of the phased array ultrasonic probe.

[0018] Of the first limiting member and the second limiting member, one includes a limiting groove provided on the corresponding wall surface, and the other includes a mounting groove provided on the corresponding wall surface and an elastic limiting member provided in the mounting groove, wherein the limiting end of the elastic limiting member matches the limiting groove.

[0019] In the shaft inspection device provided by this invention, on the one hand, the phased array ultrasonic probe rotates circumferentially with the stepper shaft, and its scanning area is an annular region. When the signal fed back by the phased array ultrasonic probe contains an echo signal, the inspector can determine whether the echo signal belongs to an inherent structural signal or a defect signal based on the structure of the shaft under test, thereby improving the inspection accuracy of the shaft under test. Furthermore, during the axial movement of the phased array ultrasonic probe over the stepper shaft, there is an overlapping area between its adjacent annular scanning areas, which can ensure a comprehensive scan of the shaft end face. On the other hand, the length of the stepper shaft is adjustable, making the shaft inspection device applicable to the inspection of large shafts with different diameters, thereby improving the applicability of the shaft inspection device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram showing the connection of the shaft detection device provided by the present invention when it detects the shaft end face of the shaft to be tested;

[0022] Figure 2 This is a schematic diagram showing the connection of the shaft detection device provided by the present invention when determining the shaft center position on the shaft end face of the shaft to be tested;

[0023] Figure 3 This is a first-view diagram showing the connection between the shaft collar and the arc-shaped positioning seat in the shaft detection device provided by the present invention.

[0024] Figure 4 This is a second-view diagram showing the connection between the shaft collar and the arc-shaped positioning seat in the shaft detection device provided by the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100 - Stepper axis; 200 - Shaft collar; 210 - First half-ring; 220 - Second half-ring; 230 - Hinge shaft; 310 - Carrier; 320 - Phased array ultrasonic probe; 410 - End support wheel; 420 - Rotational drive component; 500 - Axial drive component; 600 - Positioning magnet; 700 - Arc-shaped positioning seat; 710 - End plate; 720 - Arc-shaped plate; 730 - Connecting arc; 810 - Pivot shaft; 820 - Connecting arm; 830 - Rotating ring; 840 - First arc; 850 - Second arc; 900 - Shaft to be tested. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] This embodiment provides a shaft detection device for detecting large shafts in wind turbine units, such as... Figure 1 As shown, it includes a stepper shaft 100 with adjustable length. A shaft collar 200 is installed at the first end of the stepper shaft 100. The shaft collar 200 is configured as a shaft core component sleeved on the shaft end face of the shaft to be tested 900, and the stepper shaft 100 is rotatably connected to the shaft core component through the shaft collar 200. A phased array ultrasonic probe 320 is slidably connected to the stepper shaft 100 along its axial direction.

[0029] The shaft detection device provided in this embodiment includes a phased array ultrasonic probe 320 for scanning and detecting the shaft end face of the shaft 900 to be tested, a stepper shaft 100 for supporting the phased array ultrasonic probe 320 to rotate circumferentially around the shaft end face of the shaft 900 to be tested and for axially adjusting the position of the phased array ultrasonic probe 320, and a shaft center collar 200 for rotatably connecting the first end of the stepper shaft 100 to the shaft center position of the shaft end face. In use, the length of the stepper shaft 100 is first adjusted according to the shaft diameter of the shaft 900 to be tested, so that when the stepper shaft 100 is rotatably connected to the shaft end face through the shaft center collar 200, the scanning range of the phased array ultrasonic probe 320 along the axial direction of the stepper shaft 100 can cover the radius range of the shaft end face. Then, the spindle collar 200 is fitted onto the spindle member at the center of the shaft end face, so that the stepper shaft 100 extends radially along the shaft end face and can rotate circumferentially around the spindle member. Specifically, the spindle collar 200 and the stepper shaft 100 can be fixedly connected, and the spindle collar 200 and the spindle member can be rotatably connected; or, the spindle collar 200 and the spindle member can be fixedly connected, and the first end of the stepper shaft 100 can be rotatably connected to the spindle collar 200. The phased array ultrasonic probe 320 is then adjusted to one end of the stepping axis 100, for example, by adjusting it to the second end along the axial direction of the stepping axis 100. At this point, the scanning range of the phased array ultrasonic probe 320 can cover the edge of the axial end face. The stepping axis 100 is rotated circumferentially one revolution, and the phased array ultrasonic probe 320 rotates circumferentially with the stepping axis 100 and scans the corresponding annular area. Then, the phased array ultrasonic probe 320 is moved a first distance toward the first end of the stepping axis 100. The first distance is less than the phased array ultrasonic probe 320 along the axial direction of the stepping axis 100. The scanning width is adjusted, and the stepping shaft 100 rotates circumferentially for one revolution. The phased array ultrasonic probe 320 rotates circumferentially with the stepping shaft 100 and scans the corresponding annular area. The scanned area overlaps with the scanned area at the previous position to ensure that there are no missed areas between adjacent scanned areas. This process is repeated until the phased array ultrasonic probe 320 reaches the first end of the stepping shaft 100. At this point, the scanning range of the phased array ultrasonic probe 320 can cover the axis center position of the axis end face. The stepping shaft 100 rotates circumferentially for one revolution, and the phased array ultrasonic probe 320 completes a full scan of the axis end face.

[0030] In this shaft inspection device, on the one hand, the phased array ultrasonic probe 320 rotates circumferentially with the stepper shaft 100, and its scanning area is an annular region. When the signal fed back by the phased array ultrasonic probe 320 contains an echo signal, the inspector can determine whether the echo signal belongs to an inherent structural signal or a defect signal based on the structure of the shaft under test 900, thereby improving the inspection accuracy of the shaft under test 900. Furthermore, during the axial movement of the phased array ultrasonic probe 320 toward the stepper shaft 100, there is an overlap between its adjacent annular scanning areas, which can ensure a comprehensive scan of the shaft end face. On the other hand, the length of the stepper shaft 100 is adjustable, making the shaft inspection device applicable to the inspection of large shafts with different diameters, thereby improving the applicability of the shaft inspection device.

[0031] Specifically, the shaft component can be a bolt, a central shaft, or other protruding structure located at the center of the shaft to be tested (900).

[0032] Preferably, the circumferential rotation directions of adjacent two cycles of the stepper axis 100 are opposite. For example, if the previous circumferential rotation of the stepper axis 100 is along the first direction, then the next circumferential rotation is along the second direction. This reduces the occurrence of situations such as entanglement and pulling of the connecting wires of the phased array ultrasonic probe 320 as the stepper axis 100 rotates in the same direction, thereby ensuring the normal use of the axis detection device.

[0033] In this embodiment, the stepper axis 100 can be a telescopic axis. Specifically, the stepper axis 100 can include multiple shaft segments, and the multiple shaft segments are sequentially connected. The axial length of the stepper axis 100 can be adjusted by adjusting the connection depth of two adjacent shaft segments.

[0034] In addition to the above-described sleeve connection, in some embodiments, the stepper axis 100 may also include multiple detachably connected shaft segments along its length. The axial length of the stepper axis 100 can be adjusted by changing the number of connected shaft segments.

[0035] In this embodiment, the shaft collar 200 includes a first half-ring 210 and a second half-ring 220. The first half-ring 210 is fixed to the first end of the stepper shaft 100, and the second half-ring 220 is detachably connected to the first half-ring 210. When the end of the shaft component facing away from the shaft to be tested 900 is a free end, the second half-ring 220 can be installed without disassembling it, and the shaft collar 200 can be directly fitted onto the shaft component from the free end of the shaft component. When the end of the shaft component facing away from the shaft to be tested 900 is connected to other components, during installation, the first half-ring 210 can be brought close to and fitted onto the shaft component from one side, and then the second half-ring 220 can be brought close to and fitted onto the shaft component from the other side of the shaft component. The second half-ring 220 is then connected to the first half-ring 210, and the second half-ring 220 and the first half-ring 210 are spliced ​​together to form an annular shaft collar 200. The shaft collar 200 is rotatably fitted onto the shaft component, thereby realizing the rotatable connection between the stepper shaft 100 and the shaft component, and correspondingly improving the applicability of the shaft detection device.

[0036] In addition to the above-described form, the shaft collar 200 may also be configured in some embodiments, such as... Figure 1 As shown, the first end of the stepper axis 100 may be provided with a hinge shaft 230, the first end of the first half ring 210 and the first end of the second half ring 220 are hinged through the hinge shaft 230, and the second end of the first half ring 210 and the second end of the second half ring 220 are detachably connected. When the end of the shaft component facing away from the shaft to be tested 900 is a free end, it is not necessary to disassemble the connection between the first half-ring 210 and the second half-ring 220 during installation. The shaft collar 200 can be directly fitted onto the shaft component from the free end of the shaft component. When the end of the shaft component facing away from the shaft to be tested 900 is connected to other components, during installation, the second end of the first half-ring 210 can be separated from the second end of the second half-ring 220. The first half-ring 210 and the second half-ring 220 can be rotated around the hinge shaft 230 so that the opening between the second end of the first half-ring 210 and the second half-ring 220 is larger than the shaft diameter of the shaft component. Then, the shaft component is moved toward the shaft component so that it is located between the first half-ring 210 and the second half-ring 220. Subsequently, the first half-ring 210 and the second half-ring 220 are rotated and their second ends are connected, thereby fitting the shaft collar 200 onto the shaft component.

[0037] In this embodiment, as Figure 1 As shown, an end support wheel 410 is pivotally connected to the second end of the stepper shaft 100, and the axial direction of the end support wheel 410 is consistent with the axial direction of the stepper shaft 100. A rotary drive 420 is mounted on the stepper shaft 100, and the drive end of the rotary drive 420 is connected to the end support wheel 410, configured to drive the end support wheel 410 to rotate circumferentially. During testing, the end support wheel 410 supports the second end of the stepper shaft 100 to reduce the frictional resistance generated by the contact between the stepper shaft 100 and the shaft end face. After the axial position of the phased array ultrasonic probe 320 is determined, the rotary drive can be activated, driving the end support wheel 410 to rotate. The end support wheel 410 correspondingly drives the second end of the stepper shaft 100 to rotate synchronously circumferentially, and the stepper shaft 100 rotates circumferentially along the shaft end face, thereby carrying the phased array ultrasonic probe 320 for circumferential scanning. After the stepper shaft 100 rotates one revolution, the rotary drive 420 is deactivated. When the stepper axis 100 stops rotating, the axial position of the phased array ultrasonic probe 320 is adjusted. Then, the rotation drive 420 is activated and its direction is adjusted. The rotation drive 420 drives the end support wheel 410 to rotate in the opposite direction. The phased array ultrasonic probe 320 performs a circumferential scan in the opposite direction along with the stepper axis 100. This process is repeated. While achieving a comprehensive scan of the shaft end face, it greatly reduces the amount of labor required to manually drive the stepper axis 100 to rotate circumferentially, thereby improving the ease of use of the shaft detection device. In addition, the reciprocating rotation of the stepper axis 100 can effectively reduce the occurrence of wire entanglement.

[0038] Specifically, the rotation drive component 420 can be a drive motor. The end support wheel 410 can be a permanent magnet or an electromagnet. When the shaft end face is a horizontal end face that is not facing upwards, the end support wheel 410 can be magnetically attracted to the shaft end face to improve the stability of the stepper shaft 100 connected to the shaft end face. Preferably, the side of the stepper shaft 100 facing the shaft to be measured can also be provided with multiple auxiliary support wheels arranged at intervals along its axial direction. The auxiliary support wheels are permanent magnets or electromagnets. When the stepper shaft 100 rotates circumferentially, the end support wheel and the multiple auxiliary support wheels can support and attract different positions of the stepper shaft 100 in the axial direction, thereby further improving the stability of the stepper shaft 100 connected to the shaft end face. Similarly, the shaft collar 200 can also be a permanent magnet or an electromagnet. The shaft collar 200 can be magnetically attracted to the shaft component. The two can rotate relative to each other in the circumferential direction and generate mutual magnetic attraction, thereby ensuring the connection between the shaft collar 200 and the shaft component and reducing the occurrence of axial movement or even detachment of the shaft collar 200 along the axis.

[0039] Similarly, in this embodiment, as Figure 1 As shown, the stepper axis 100 can be equipped with an axial drive component 500. The drive end of the axial drive component 500 is connected to the phased array ultrasonic probe 320, and is used to drive the phased array ultrasonic probe 320 to move along the axial direction of the stepper axis 100. During testing, the axial position of the phased array ultrasonic probe 320 can be adjusted along the stepper axis 100 by activating the axial drive component 500, thereby further improving the ease of use of the axial testing device. Specifically, the axial drive component 500 can be a stepper motor, etc.

[0040] Preferably, the shaft detection device also includes a controller, to which the phased array ultrasonic probe 320, the rotary drive component 420, and the axial drive component 500 are all connected. Based on the shaft diameter of the shaft 900 under test and the scanning width of the phased array ultrasonic probe 320, the controller can be configured to set the driving direction and duration of the rotary drive component 420, the single axial drive distance of the axial drive component 500, and the start / stop of the phased array ultrasonic probe 320, the rotary drive component 420, and the axial drive component 500. This enables automatic detection of the shaft 900 under test, thereby improving the ease of use and accuracy of the shaft detection device. Specifically, this controller can be a standalone controller or a controller integrated into the phased array ultrasonic testing equipment.

[0041] When the shaft to be tested 900 is a rotating shaft or the shaft end face of the shaft to be tested 900 does not have a shaft core, the shaft detection device provided in this embodiment may further include a fixing ring that matches the shaft to be tested 900. The fixing ring is configured to be sleeved on the shaft to be tested 900 and fixedly installed. The fixing ring is provided with a connecting part, and the second end of the stepper shaft 100 can be detachably connected to the connecting part. When the second end of the stepper shaft 100 is connected to the connecting part, the axial direction of the stepper shaft 100 is consistent with the radial direction of the fixing ring. The axial drive 500 installed on the stepper shaft 100 is communicatively connected to the controller. The test shaft 900 rotates continuously. Besides being rotatably connected to the shaft center of the test shaft 900 via the shaft collar 200, and the stepper shaft 100 rotating relative to the shaft end face of the test shaft 900 to achieve detection, a fixing collar can also be fitted onto the test shaft 900. The fixing collar is fixed relative to the ground by its own weight or by fasteners to other devices of the wind turbine. Then, the second end of the stepper shaft 100 is detachably connected to the connecting part of the fixing collar. At this time, the stepper shaft 100 is located on the test shaft 900. The stepper shaft 100 is fixed at the end face of the shaft and extends radially along the end face of the shaft. The stepper shaft 100 is fixed under the connection of the fixed collar. The test shaft 900 and the stepper shaft 100 rotate relative to each other. The phased array ultrasonic probe 320 on the stepper shaft 100 performs a circumferential scan of the end face of the shaft. After the test shaft 900 rotates one revolution, the controller controls the axial drive to drive the phased array ultrasonic probe 320 to move a certain distance along the axial direction of the stepper shaft 100 to scan another area radially on the end face of the shaft. This can be repeated to achieve a comprehensive scan of the end face of the shaft.

[0042] The fixed collar setting allows the relative rotation between the stepper shaft 100 and the shaft under test 900 to be achieved directly by the operation of the shaft under test 900, without the need to apply additional circumferential rotation driving force to the stepper shaft 100, thereby improving the ease of use and functionality of the detection device and enabling remote online monitoring of the shaft under test 900.

[0043] Of course, when the shaft to be tested 900 is a rotating shaft and there is a shaft core on its shaft end face, when the above-mentioned remote online monitoring method is used, the shaft core collar 200 can be fitted onto the shaft core to limit the first end of the stepper shaft 100, thereby further improving the stability of the stepper shaft 100 and correspondingly improving the detection accuracy of the phased array ultrasonic probe 320.

[0044] In this embodiment, as Figure 1As shown, the shaft detection device may further include a positioning magnet 600, which matches the shaft center collar 200. The positioning magnet 600 is configured to magnetically adhere to the center of the shaft end face of the shaft to be tested 900 as a shaft center component. When a shaft center component exists on the shaft end face of the shaft to be tested 900, the positioning magnet 600 can be removed, and the shaft center collar 200 can be directly fitted onto the shaft center component for use. When a shaft center component does not exist on the shaft end face of the shaft to be tested 900, the positioning magnet 600 can be magnetically fixed to the center position of the shaft end face as a shaft center component, and then the shaft center collar 200 can be fitted onto the positioning magnet 600 to achieve a rotational connection between the stepper shaft 100 and the shaft end face, thereby further improving the applicability of the shaft detection device. Preferably, the positioning magnet 600 can be an electromagnet. When installing the positioning magnet 600, it can be de-energized. After the position of the positioning magnet 600 is determined, it can be energized again to make it magnetically attracted to the center position of the shaft end face. This reduces the occurrence of the positioning magnet 600 being magnetically attracted to the shaft end face during the position determination process, which makes the position difficult to adjust. When it is necessary to remove the positioning magnet 600, it can be de-energized, and there will be no magnetic attraction between the positioning magnet 600 and the shaft end face, thereby improving the ease of installation and removal of the positioning magnet 600.

[0045] Optionally, in this embodiment, as Figure 3 and Figure 4 As shown, the shaft detection device also includes an arc-shaped positioning seat 700, which includes a vertically arranged end plate 710 and an arc-shaped plate 720. The radius of the connecting arc 730 between the end plate 710 and the concave side of the arc-shaped plate 720 is equal to the shaft radius of the shaft to be tested 900. The arc-shaped positioning seat 700 and the shaft collar 200 are rotatably connected by a pivot shaft 810. The pivot shaft 810 and the shaft collar 200 are detachably connected, and the axis of the pivot shaft 810 coincides with the axis of the shaft collar 200 and intersects with the connecting arc 730. The end plate 710 is a flat plate structure. The arc plate 720 is connected to the end plate 710 and the axis of the arc plate 720 is perpendicular to the plate surface of the end plate 710. The concave arc surface of the arc plate 720 connects with the plate surface of the end plate 710 to form a concave angle. The connection between the concave arc surface and the plate surface of the end plate 710 forms a connecting arc 730. The connecting arc 730 is an arc at the end of the concave arc surface. The axial radius of the connecting arc 730 is equal to the axial radius of the shaft to be measured 900. The concave angle of the arc positioning seat 700 can fit well with part of the peripheral area of ​​the shaft to be measured 900. The end plate 710 fits with the shaft end face, and the concave arc surface of the arc plate 720 fits with the axial side wall of the shaft to be measured 900.

[0046] When there is no spindle on the end face of the shaft to be tested 900, first determine the installation position of the positioning magnet 600, connect the pivot shaft 810 to the spindle collar 200, and adjust the length of the stepper shaft 100 so that the distance between its end support wheel 410 and the axis of the spindle collar 200 is equal to the shaft radius of the shaft to be tested 900 (when the end support wheel 410 is not set, the distance between the second end of the stepper shaft 100 and the axis of the spindle collar 200 is equal to the shaft radius of the shaft to be tested 900); Figure 2 As shown, the arc-shaped positioning seat 700 is then fitted onto the first peripheral area of ​​the shaft to be tested 900. At this time, the connecting arc 730 approximately coincides with the shaft edge of the first peripheral area of ​​the shaft to be tested 900. Since the axis of the pivot shaft 810 coincides with the shaft center collar 200 and intersects with the connecting arc 730, the axis of the shaft center collar 200 is parallel to the axis of the shaft to be tested 900, and the distance between them is equal to the shaft radius of the shaft to be tested 900. The axis of the stepper shaft 100 is approximately parallel to the end face of the shaft to be tested 900. The stepper shaft 100 is rotated circumferentially, and the rolling trajectory of the end support wheel 410 of the stepper shaft 100 on the shaft end face is... The first arc is 840; then the arc-shaped positioning seat 700 is attached to the second peripheral area of ​​the shaft 900 to be tested (the second peripheral area is different from the first peripheral area and is not shown in the figure). The stepper shaft 100 is rotated circumferentially, and the rolling trajectory of the end support wheel 410 on the shaft end face is the second arc 850. The intersection point S of the second arc 850 and the first arc 840 is the axis center position of the shaft end face. Then, the positioning magnet 600 is magnetically attracted to the intersection point S. Then, the connection between the pivot shaft 810 and the axis collar 200 is removed, and the axis collar 200 is fitted onto the positioning magnet 600 to detect the shaft 900. The above setup can use the stepper shaft 100 to determine the axis center position of the shaft end face, thereby improving the functionality of the shaft detection device and the installation position accuracy of the positioning magnet 600, and correspondingly improving the detection accuracy of the shaft detection device for the shaft 900.

[0047] Specifically, such as Figure 3 and Figure 4 As shown, the first end of the pivot shaft 810 can be fixed to the end plate 710 of the arc-shaped positioning seat 700, and the axis of the pivot shaft 810 intersects with the connecting arc 730; the second end of the pivot shaft 810 is rotatably engaged with a rotating ring 830, which can rotate circumferentially relative to the pivot shaft 810 but cannot move axially relative to the pivot shaft 810. The rotating ring 830 and the shaft collar 200 are detachably connected through multiple connecting arms 820, and the rotating ring 830 and the shaft collar 200 are coaxial. Thus, the pivot shaft 810 and the shaft collar 200 are coaxial, and the second end of the pivot shaft 810 is pivotally connected to the shaft collar 200, thereby realizing the rotational connection between the arc-shaped positioning seat 700 and the shaft collar 200. Of course, in other embodiments, the first end of the pivot shaft 810 can also be pivotally connected to the arc-shaped positioning seat 700.

[0048] In this embodiment, the shaft detection device further includes a carrier 310 and a slider disposed on the carrier 310. The stepper shaft 100 is provided with a groove extending along its axial direction. The groove opening width is smaller than the groove body width, and the slider is slidably engaged in the groove. The phased array ultrasonic probe 320 is mounted on the carrier 310. This is a specific form in which the phased array ultrasonic probe 320 is axially slidably connected to the stepper shaft 100. In this case, the slider can slide along the extension direction of the groove, and the groove opening can restrict the slider from falling outward, so as to ensure the connection and cooperation between the slider and the groove. This ensures the guiding and limiting effect of the groove on the slider, the carrier 310, and the phased array ultrasonic probe 320, and correspondingly reduces the occurrence of circumferential deflection when adjusting the axial position of the phased array ultrasonic probe 320, which would affect the accuracy of its scanning range.

[0049] Specifically, in this embodiment, one of the inner wall of the groove and the outer wall of the slider is provided with a first limiting member, and the other is provided with a plurality of second limiting members. The plurality of second limiting members are evenly spaced along the extension direction of the corresponding wall surface, and the distance between two adjacent second limiting members is less than the scanning width of the phased array ultrasonic probe 320. Of the first limiting member and the second limiting member, one includes a limiting groove provided on the corresponding wall surface, and the other includes a mounting groove provided on the corresponding wall surface and an elastic limiting member provided in the mounting groove. The limiting end of the elastic limiting member matches the limiting groove. Taking the example of a first limiting member being a mounting groove and an elastic limiting member, with the mounting groove located on the outer wall of the slider and the second limiting member being a limiting groove located on the inner wall of the slide groove, the carrier 310 is slidably engaged with the slide groove via the slider. Initially, the slider is located at the second end of the stepper shaft 100, and the elastic limiting member is inserted into the corresponding limiting groove. The limiting groove, through the elastic limiting member, limits the position of the slider within the slide groove, thereby improving the stability of the axial position of the carrier 310 and the phased array ultrasonic probe 320 relative to the stepper shaft 100. When the stepper shaft 100 rotates one revolution, the axial position of the carrier 310 and the phased array ultrasonic probe 320 needs to be adjusted. When in position, the slider can be axially slidable. The outer end of the elastic limiting member is squeezed inward by the wall of the limiting groove and disengages from the limiting groove. At this time, the elastic limiting member is squeezed by the inner wall of the sliding groove and remains retracted into the mounting groove. When the elastic limiting member slides to the position of the adjacent limiting groove, the inner wall of the sliding groove no longer squeezes the elastic limiting member, and the outer end of the elastic limiting member pops outward and inserts into the limiting groove, thereby completing a single axial position adjustment of the phased array ultrasonic probe 320. The limiting groove can restrict the axial position of the slider, the carrier 310 and the phased array ultrasonic probe 320. This is repeated to complete a comprehensive scan of the axial end face.

[0050] Where the distance between two adjacent limiting grooves is less than the scanning width of the phased array ultrasonic probe 320 along the stepping axis 100, the scanning range of two adjacent axial position adjustments of the phased array ultrasonic probe 320 overlaps, thus ensuring that the shaft detection device can perform a comprehensive scan of the shaft end face. Specifically, the elastic limiting component can be a ball-head plunger, and the limiting groove is correspondingly a spherical groove.

[0051] Of course, in other embodiments, when the first limiting member is a mounting groove and an elastic limiting member, it can also be provided on the inner wall of the groove, and when the second limiting member is a limiting groove, it can also be provided on the outer wall of the slider; or, the first limiting member can also be a limiting groove, which can be provided on the outer wall of the slider or the inner wall of the groove, while the second limiting member is a mounting groove and an elastic limiting member, which can be provided on the inner wall of the groove or the outer wall of the slider.

[0052] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shaft inspection device for inspecting large shafts in wind turbine generators, characterized in that, The device includes an adjustable-length stepper shaft (100), with a shaft collar (200) mounted at its first end. The shaft collar (200) is configured as a shaft core that is sleeved on the end face of the shaft to be tested (900), and the stepper shaft (100) is rotatably connected to the shaft core via the shaft collar (200). A phased array ultrasonic probe (320) is slidably connected to the stepper shaft (100) along its axial direction. The shaft detection device further includes a positioning magnet (600) and an arc-shaped positioning seat (700). The positioning magnet (600) is an electromagnet, and it matches the shaft center collar (200). The positioning magnet (600) is configured to magnetically attract the shaft end face of the shaft to be tested (900) at the shaft center to serve as the shaft center component. The arc-shaped positioning seat (700) includes a vertically arranged end plate (710) and an arc-shaped plate (720). 10) The radius of the connecting arc (730) to the concave side of the arc plate (720) is equal to the radius of the shaft to be tested (900); the arc positioning seat (700) and the shaft collar (200) are rotatably connected by a pivot shaft (810), the pivot shaft (810) and the shaft collar (200) are detachably connected, and the axis of the pivot shaft (810) coincides with the axis of the shaft collar (200) and intersects with the connecting arc (730).

2. The shaft detection device according to claim 1, characterized in that, The shaft collar (200) includes a first half-ring (210) and a second half-ring (220). The first half-ring (210) is fixed to the first end of the stepper shaft (100), and the second half-ring (220) is detachably connected to the first half-ring (210). Alternatively, the first end of the stepper shaft (100) is provided with a hinge shaft (230), the first end of the first half ring (210) and the first end of the second half ring (220) are hinged through the hinge shaft (230), and the second end of the first half ring (210) and the second end of the second half ring (220) are detachably connected.

3. The shaft detection device according to claim 1, characterized in that, The second end of the stepper shaft (100) is pivotally connected to an end support wheel (410), the axial direction of the end support wheel (410) being consistent with the axial direction of the stepper shaft (100); the stepper shaft (100) is equipped with a rotary drive (420), the drive end of the rotary drive (420) being connected to the end support wheel (410) and configured to drive the end support wheel (410) to rotate circumferentially.

4. The shaft detection device according to claim 3, characterized in that, The stepper axis (100) is equipped with an axial drive (500), the drive end of which is connected to the phased array ultrasonic probe (320) to drive the phased array ultrasonic probe (320) to move along the axial direction of the stepper axis (100).

5. The shaft detection device according to claim 4, characterized in that, The shaft detection device also includes a controller, and the phased array ultrasonic probe (320), the circumferential drive (420) and the axial drive (500) are all connected to the controller.

6. The shaft detection device according to claim 1, characterized in that, The shaft detection device further includes a controller and a fixing ring that matches the shaft to be tested (900). The fixing ring is configured to be sleeved on the shaft to be tested (900) and fixedly installed. The fixing ring has a connecting part, and the second end of the stepper shaft (100) can be detachably connected to the connecting part. When the second end of the stepper shaft (100) is connected to the connecting part, the axial direction of the stepper shaft (100) is consistent with the radial direction of the fixing ring. The stepper axis (100) is equipped with an axial drive (500), the drive end of which is connected to the phased array ultrasonic probe (320) to drive the phased array ultrasonic probe (320) to move along the axial direction of the stepper axis (100); the axial drive (500) is connected to the controller.

7. The shaft detection device according to any one of claims 1-6, characterized in that, The shaft detection device further includes a carrier (310) and a slider disposed on the carrier (310). The stepping shaft (100) is provided with a groove extending along its axial direction. The groove opening width is smaller than the groove body width. The slider is slidably engaged with the groove. The phased array ultrasonic probe (320) is mounted on the carrier (310).

8. The shaft detection device according to claim 7, characterized in that, Of the inner wall of the chute and the outer wall of the slider, one is provided with a first limiting member, and the other is provided with multiple second limiting members. The multiple second limiting members are evenly spaced along the extension direction of the corresponding wall surface, and the distance between two adjacent second limiting members is less than the scanning width of the phased array ultrasonic probe (320). Of the first limiting member and the second limiting member, one includes a limiting groove provided on the corresponding wall surface, and the other includes a mounting groove provided on the corresponding wall surface and an elastic limiting member provided in the mounting groove, wherein the limiting end of the elastic limiting member matches the limiting groove.

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