Ultrasonic detection device for cracks of in-service fan main shaft

Abstract

The utility model discloses an ultrasonic detection device for cracks of an in-service fan main shaft, and particularly relates to the technical field of ultrasonic detection, the ultrasonic detection device comprises a support frame, a fixed frame is fixedly arranged at the top of the support frame, a sliding block is slidably connected in the fixed frame, and an outer frame sleeve is fixedly arranged on one side of each of the support frame and the sliding block; an adjusting mechanism is arranged in the outer frame sleeve and comprises a first electric telescopic rod fixedly arranged in the outer frame sleeve, and a movable block is fixedly arranged at the output end of the first electric telescopic rod. According to the utility model, multi-dimensional adjustment is realized, the position of the probe on the main shaft can be flexibly changed and fine tuning is carried out, the probe is ensured to be tightly attached to the surface of the main shaft all the time, the detection accuracy is greatly improved, the device can adapt to the detection requirements of different positions of the main shaft, the detection coverage range and accuracy are improved, and the detection efficiency is improved. And the quality of in-service fan main shaft crack detection work is effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic testing technology, and more specifically, to an ultrasonic testing device for cracks in the main shaft of an in-service wind turbine. Background Technology

[0002] In wind power generation, wind turbines convert wind energy into electrical energy. In thermal power generation, wind turbines ensure the normal heat dissipation and ventilation of generator sets, ensuring their stable operation. Ultrasonic detection devices for cracks in the main shaft of in-service wind turbines are crucial for ensuring the safe and reliable operation of related equipment in the energy sector, and are directly related to the continuous and stable supply of energy.

[0003] Ultrasonic nondestructive testing is a widely used defect detection method. In field operations, the large quantity of test blocks required, which are usually made of steel and are heavy and bulky, causes many inconveniences for the testing personnel. In addition, the main shaft of the fan is only inspected before leaving the factory, and the main shaft of the fan in operation cannot be subjected to ultrasonic testing due to the limitations of the field conditions.

[0004] A search revealed that Chinese patent CN105973996A discloses an ultrasonic testing method and test block for cracks in the main shaft of an in-service wind turbine. This structure uses the wind turbine main shaft, between its outer casing and bearings, as the detection area. It also includes a flaw detection surface formed by the vertical extension of the bearing's inner surface into the main shaft. Several ultrasonic probes arranged axially along the main shaft are placed on the outer circumferential surface of the detection area, emitting longitudinal waves towards the flaw detection surface. This overcomes the limitations of detection conditions under operating conditions, enabling ultrasonic testing of the main shaft of an in-service wind turbine. This better protects the main shaft, preventing events such as shaft breakage that could endanger the safe operation of the wind turbine, and facilitates defect detection, ensuring the safe operation of the main shaft.

[0005] However, in actual use, the mechanism uses several ultrasonic probes arranged along the axial direction of the main shaft of the fan for detection. But for fans with long main shafts, the probe coverage is limited, which makes it impossible to fully detect the entire axial length of the main shaft, thus creating a blind spot in the detection. This makes it risky to overlook cracks and defects in the main shaft. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides an ultrasonic detection device for cracks in the main shaft of in-service wind turbines, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An ultrasonic testing device for cracks in the main shaft of an in-service wind turbine includes a support frame, a fixed frame fixedly installed on the top of the support frame, a slider slidably connected inside the fixed frame, an outer frame sleeve fixedly installed on one side of both the support frame and the slider, and an adjustment mechanism installed inside the outer frame sleeve.

[0009] The adjustment mechanism includes a first electric telescopic rod fixedly installed inside the outer frame. A movable block is fixedly installed at the output end of the first electric telescopic rod. Two second electric telescopic rods are fixedly installed on one side of the movable block. An L-shaped block is fixedly installed at the output end of each of the two second electric telescopic rods. Two fixing grooves are formed on the surface of the L-shaped block. Fixing blocks are inserted into the interior of each of the two fixing grooves. The cross-section of the fixing block is T-shaped. An arc-shaped clamp is fixedly installed on one side of the fixing block. An ultrasonic probe is snapped into the interior of the arc-shaped clamp.

[0010] By adopting the above technical solution, multi-dimensional adjustment can be achieved, which can flexibly change the position of the probe on the main shaft and make fine adjustments to ensure that the probe is always in close contact with the surface of the main shaft. This not only greatly improves the accuracy of the detection, but also enables the device to adapt to the detection needs of different positions on the main shaft. The operation is convenient and efficient, and it effectively ensures the quality of crack detection work on the main shaft of in-service wind turbines.

[0011] As a further description of the above technical solution: a disassembly mechanism is provided on one side of the L-shaped block. The disassembly mechanism includes two stabilizing plates fixedly disposed on one side of the L-shaped block. An L-shaped limiting block is fixedly disposed on one side of each of the two stabilizing plates. A threaded rod is threadedly connected to the inside of the L-shaped limiting block. A fixed handle is fixedly disposed at one end of the threaded rod. A limiting plate is rotatably connected to the other end of the threaded rod. The cross-section of the limiting plate is L-shaped. A guide block is fixedly disposed on one side of the limiting plate. A guide groove is formed on the surface of the stabilizing plate. The guide block is slidably connected to the guide groove.

[0012] By adopting the above technical solution, it is easier to disassemble, replace or readjust the components of the detection device to better adapt to spindles of different diameters.

[0013] As a further description of the above technical solution: a mounting frame is fixedly provided on one side of the fixed frame, a stepper motor is installed on the top of the mounting frame, a threaded shaft is fixedly provided at the output end of the stepper motor, one end of the threaded shaft passes through the fixed frame and is rotatably connected to the inner wall of the fixed frame, a threaded hole is opened on the surface of the slider, the threaded shaft is threadedly connected to the threaded hole, a rubber layer is fixedly provided on one side of the limiting plate, a limiting strip is snapped onto one side of the rubber layer, and the limiting strip is snapped onto the L-shaped limiting block.

[0014] By adopting the above technical solution, not only can the ultrasonic probe be quickly positioned by driving the slider with a stepper motor, facilitating testing, but the flexibility and accuracy of the testing process are also ensured, effectively improving the applicability of this device to various specifications of fan spindles.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. By setting up an adjustment mechanism, compared with the existing technology, a stepper motor is used to drive the threaded shaft to rotate. Based on the principle of thread transmission, the slider that is threaded to it moves linearly along the axis within the fixed frame, thereby driving the connected outer frame and arc-shaped clamp to move, so that the ultrasonic probe is in contact with the surface of the main shaft. The first electric telescopic rod can be extended or shortened to move the movable block within the outer frame, thereby driving the arc-shaped clamp and ultrasonic probe to change the detection position on the main shaft. At the same time, the second electric telescopic rod is extended and shortened to drive the fixed block and arc-shaped clamp to make fine adjustments, ensuring that the ultrasonic probe is always in close contact with the surface of the operating fan main shaft. This effectively overcomes the adjustment limitations that may exist in the existing technology, and provides comprehensive detection of the entire main shaft, greatly improving the detection coverage and accuracy.

[0017] 2. By setting up a disassembly mechanism, compared with the existing technology, the threaded rod rotates by rotating the fixed handle in the opposite direction. Since the threaded rod is connected to the limiting plate, and the guide block on one side of the limiting plate and the corresponding guide groove are slidably connected, the limiting plate will move upward in a straight line along the guide groove. This movement causes the rubber layer on one side of the limiting plate to separate from the limiting strip. Then, the limiting strip can be pulled outward to allow it to exit from inside the L-shaped limiting block. Further pulling the arc-shaped clamp outward will cause the fixed block on one side to be removed from the fixed groove, thus successfully removing the arc-shaped clamp. At the same time, the internal ultrasonic probe can also be removed. This makes full preparation for replacing the arc-shaped clamp with one that is compatible with the diameter of the main shaft to be tested, thereby ensuring that the ultrasonic probe can accurately test the fan main shaft in the new testing situation, ensuring the smooth progress of the testing work and the accuracy and reliability of the test results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a cross-sectional structural diagram of the overall working state of this utility model.

[0020] Figure 3 This is a schematic diagram of the adjustment mechanism of this utility model.

[0021] Figure 4 This is a schematic diagram of the disassembly mechanism of this utility model.

[0022] Figure 5 This is a schematic diagram showing the detailed structure of the disassembly mechanism of this utility model.

[0023] The attached figures are labeled as follows: 1. Support frame; 2. Fixed frame; 3. Slider; 4. Outer frame sleeve; 5. First electric telescopic rod; 6. Movable block; 7. Second electric telescopic rod; 8. L-shaped block; 9. Fixed block; 10. Arc-shaped clamp; 11. Ultrasonic probe; 12. Stabilizing plate; 13. L-shaped limiting block; 14. Threaded rod; 15. Fixed handle; 16. Limiting plate; 17. Guide block; 18. Mounting frame; 19. Stepper motor; 20. Threaded shaft; 21. Rubber layer; 22. Limiting strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The embodiments disclosed in this application are as follows: Figure 1-5 The ultrasonic testing device for cracks in the main shaft of an in-service wind turbine shown includes a support frame 1, a fixed frame 2 fixedly installed on the top of the support frame 1, a slider 3 slidably connected inside the fixed frame 2, an outer frame sleeve 4 fixedly installed on one side of both the support frame 1 and the slider 3, and an adjustment mechanism installed inside the outer frame sleeve 4.

[0026] The adjustment mechanism includes a first electric telescopic rod 5 fixedly installed inside the outer frame 4. A movable block 6 is fixedly installed at the output end of the first electric telescopic rod 5. Two second electric telescopic rods 7 are fixedly installed on one side of the movable block 6. An L-shaped block 8 is fixedly installed at the output end of each of the two second electric telescopic rods 7. Two fixing grooves are formed on the surface of the L-shaped block 8, and fixing blocks 9 are inserted into the interior of each fixing groove. The cross-section of the fixing block 9 is T-shaped. An arc-shaped clamp 10 is fixedly installed on one side of the fixing block 9. An ultrasonic probe 11 is snapped into the interior of the arc-shaped clamp 10. After one inspection on the main shaft of the in-service fan is completed, when it is necessary to adjust the ultrasonic probe... When the head 11 performs tests on different positions on the main shaft of the in-service fan, the movable block 6 moves inside the outer frame 4 by extending or shortening the first electric telescopic rod 5, which in turn moves the subsequently connected arc-shaped clamp 10 to adjust the detection position of the ultrasonic probe 11 on the main shaft of the in-service fan. Since the overall diameter and length of the main shaft of the in-service fan may vary, the second electric telescopic rod 7 is extended or shortened simultaneously, which in turn moves the fixed block 9 and the arc-shaped clamp 10 to make fine adjustments, thereby achieving fine adjustments of the ultrasonic probe 11. This ensures that the ultrasonic probe 11 is always in contact with the surface of the main shaft of the in-service fan, improving the accuracy of the test.

[0027] Reference Figure 2-3 As shown, a disassembly mechanism is provided on one side of the L-shaped block 8. The disassembly mechanism includes two stabilizing plates 12 fixedly disposed on one side of the L-shaped block 8. An L-shaped limiting block 13 is fixedly disposed on one side of each of the two stabilizing plates 12. A threaded rod 14 is threadedly connected to the inside of the L-shaped limiting block 13. A fixed handle 15 is fixedly disposed at one end of the threaded rod 14, and a limiting plate 16 is rotatably connected to the other end of the threaded rod 14. The limiting plate 16 has an L-shaped cross-section. A guide block 17 is fixedly disposed on one side of the limiting plate 16. A guide groove is formed on the surface of the stabilizing plate 12. The guide block 17 is slidably connected to the guide groove. If it is necessary to inspect different in-service fan main shafts and the diameter difference is large, the threaded rod 14 is rotated by rotating the fixed handle 15 in the opposite direction. The threaded rod 14 drives the limiting plate 16 to rotate. Since a guide block 17 is fixedly disposed on one side of the limiting plate 16, the threaded rod 14 is rotated. The guide block 17 is slidably connected to the guide groove. Under the principle of threaded transmission, the limiting plate 16 will move linearly along the direction of the guide groove, thereby driving the limiting plate 16 to move upward, so that the rubber layer 21 on one side of the limiting plate 16 separates from the limiting strip 22. Then, the limiting strip 22 is pulled outward to drive the limiting strip 22 out of the L-shaped limiting block 13, and then the arc-shaped clamp 10 is pulled outward to drive the fixing block 9 on one side of the arc-shaped clamp 10 to be taken out from the fixing groove. Then the arc-shaped clamp 10 is removed, and the ultrasonic probe 11 inside is removed. This disassembly operation can prepare for replacing the arc-shaped clamp 10 with one that is more suitable for the diameter of the main shaft to be tested, thereby ensuring that the ultrasonic probe 11 can accurately test the fan main shaft in the new testing scenario, ensuring the smooth progress of the testing work and the accuracy of the test results.

[0028] Reference Figure 4-5 As shown, a mounting frame 18 is fixedly installed on one side of the fixed frame 2, and a stepper motor 19 is installed on the top of the mounting frame 18. A threaded shaft 20 is fixedly installed at the output end of the stepper motor 19. One end of the threaded shaft 20 passes through the fixed frame 2 and is rotatably connected to the inner wall of the fixed frame 2. A threaded hole is opened on the surface of the slider 3, and the threaded shaft 20 is threadedly connected to the threaded hole. A rubber layer 21 is fixedly installed on one side of the limiting plate 16, and a limiting strip 22 is snapped onto one side of the rubber layer 21. The limiting strip 22 is snapped onto the L-shaped limiting block 13. When the stepper motor 19 is started... This causes the threaded shaft 20 to rotate. According to the principle of threaded transmission, the rotation of the threaded shaft 20 will cause the slider 3, which is threaded to it, to move linearly along the axial direction of the threaded shaft 20 within the fixed frame 2. By controlling the rotation direction and number of steps of the stepper motor 19, the position of the slider 3 in the horizontal direction can be precisely adjusted, thereby driving the outer frame sleeve 4 connected to it to adjust its position, thereby driving the arc-shaped clamp 10 to fit against the outside of the main shaft of the in-service fan, thereby making the ultrasonic probe 11 fit and contact the surface of the main shaft of the in-service fan for detection.

[0029] Working principle of this utility model:

[0030] This invention relates to an ultrasonic testing device for cracks in the main shaft of an in-service wind turbine. In use, the device is first moved to the location of the main shaft of the in-service wind turbine, and two arc-shaped clamps 10 are placed on either side of the main shaft. Then, the stepper motor 19 is started, which drives the threaded shaft 20 to rotate. According to the principle of threaded transmission, the rotation of the threaded shaft 20 causes the slider 3, which is threadedly engaged with it, to move linearly along the axial direction of the threaded shaft 20 within the fixed frame 2. By controlling the rotation direction and number of steps of the stepper motor 19, the horizontal position of the slider 3 can be precisely adjusted, thereby driving the corresponding movement. The outer frame 4 is adjusted to move the arc-shaped clamp 10 to fit against the outside of the in-service fan main shaft, thereby making the ultrasonic probe 11 fit and contact the surface of the in-service fan main shaft for detection. The ultrasonic probe 11 is excited by the electric pulse signal and generates ultrasonic waves according to the piezoelectric effect, which are transmitted to the fan main shaft. When encountering defects such as cracks, some ultrasonic waves are reflected back to the probe receiving end. The received signal is converted and transmitted to the processing equipment. After amplification, filtering and other processing, its characteristic changes are analyzed, which can determine the crack condition and health status of the main shaft so as to take maintenance measures. This is the prior art and will not be described in detail in this technical solution.

[0031] After one inspection on the main shaft of the in-service fan is completed, when it is necessary to inspect different positions on the main shaft of the in-service fan using the ultrasonic probe 11, the movable block 6 is moved inside the outer frame 4 by extending or shortening the first electric telescopic rod 5, which in turn drives the subsequently connected arc-shaped clamp 10 to move, adjusting the inspection position of the ultrasonic probe 11 on the main shaft of the in-service fan. Since the overall diameter and length of the main shaft of the in-service fan may be different, the second electric telescopic rod 7 is extended or shortened at the same time, which drives the fixed block 9 and the arc-shaped clamp 10 to make fine adjustments, thus realizing the fine adjustment of the ultrasonic probe 11, so that the ultrasonic probe 11 is always in contact with the surface of the main shaft of the in-service fan, improving the accuracy of the inspection.

[0032] If it is necessary to inspect the main shafts of different in-service wind turbines, and the diameters differ significantly, the threaded rod 14 is rotated by rotating the fixed handle 15 in the opposite direction. The threaded rod 14 then rotates the limiting plate 16. Since a guide block 17 is fixedly installed on one side of the limiting plate 16, and the guide block 17 is slidably connected to the guide groove, the limiting plate 16 will move linearly along the direction of the guide groove under the threaded transmission principle. This will cause the limiting plate 16 to move upward, separating the rubber layer 21 on one side of the limiting plate 16 from the limiting strip 22, and then pulling it outward. The limiting strip 22 is pulled out of the L-shaped limiting block 13, which in turn pulls the arc-shaped clamp 10 outward, causing the fixing block 9 on one side of the arc-shaped clamp 10 to be removed from the fixing groove. Then the arc-shaped clamp 10 is removed, and the ultrasonic probe 11 inside is removed. This disassembly operation prepares for replacing the arc-shaped clamp 10 with one that is more suitable for the diameter of the main shaft to be tested, thereby ensuring that the ultrasonic probe 11 can accurately test the fan main shaft in the new testing scenario, ensuring the smooth progress of the testing work and the accuracy of the test results.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultrasonic testing device for cracks in the main shaft of an in-service wind turbine, comprising a support frame (1), characterized in that: A fixed frame (2) is fixedly installed on the top of the support frame (1), and a slider (3) is slidably connected inside the fixed frame (2). An outer frame sleeve (4) is fixedly installed on one side of both the support frame (1) and the slider (3), and an adjustment mechanism is installed inside the outer frame sleeve (4). The adjustment mechanism includes a first electric telescopic rod (5) fixedly installed inside the outer frame (4). A movable block (6) is fixedly installed at the output end of the first electric telescopic rod (5). Two second electric telescopic rods (7) are fixedly installed on one side of the movable block (6). An L-shaped block (8) is fixedly installed at the output end of each of the two second electric telescopic rods (7). Two fixing grooves are opened on the surface of the L-shaped block (8). A fixing block (9) is inserted into the inside of each of the two fixing grooves. The cross-section of the fixing block (9) is T-shaped. An arc-shaped clamp (10) is fixedly installed on one side of the fixing block (9). An ultrasonic probe (11) is snapped into the inside of the arc-shaped clamp (10).

2. The ultrasonic detection device for cracks in the main shaft of an in-service wind turbine according to claim 1, characterized in that: A disassembly mechanism is provided on one side of the L-shaped block (8). The disassembly mechanism includes two stabilizing plates (12) fixedly disposed on one side of the L-shaped block (8). An L-shaped limiting block (13) is fixedly disposed on one side of each of the two stabilizing plates (12). A threaded rod (14) is threadedly connected to the inside of the L-shaped limiting block (13).

3. The ultrasonic detection device for cracks in the main shaft of an in-service wind turbine according to claim 2, characterized in that: One end of the threaded rod (14) is fixedly provided with a fixed handle (15), and the other end of the threaded rod (14) is rotatably connected to a limiting plate (16). The cross-section of the limiting plate (16) is set in an L shape, and a guide block (17) is fixedly provided on one side of the limiting plate (16). A guide groove is opened on the surface of the stabilizing plate (12), and the guide block (17) is slidably connected to the guide groove.

4. The ultrasonic detection device for cracks in the main shaft of an in-service wind turbine according to claim 1, characterized in that: A mounting frame (18) is fixedly provided on one side of the fixed frame (2), and a stepper motor (19) is installed on the top of the mounting frame (18). A threaded shaft (20) is fixedly provided at the output end of the stepper motor (19).

5. The ultrasonic detection device for cracks in the main shaft of an in-service wind turbine according to claim 4, characterized in that: One end of the threaded shaft (20) passes through the fixed frame (2) and is rotatably connected to the inner wall of the fixed frame (2). The surface of the slider (3) is provided with a threaded hole, and the threaded shaft (20) is threadedly connected to the threaded hole.

6. The ultrasonic detection device for cracks in the main shaft of an in-service wind turbine according to claim 3, characterized in that: A rubber layer (21) is fixedly provided on one side of the limiting plate (16), and a limiting strip (22) is snapped onto one side of the rubber layer (21), and the limiting strip (22) is snapped onto the L-shaped limiting block (13).

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