A large wind turbine main shaft flaw detection system and method

Abstract

The present invention discloses a large-scale wind turbine main shaft flaw detection system and method, which relates to the technical field of flaw detection equipment, including a frame, the inner side of which is fixedly connected to a bottom plate; one side of the frame is fixedly connected to a controller; and also includes: a cleaning component, which is arranged on the top of the bottom plate, and is used to remove crack blockage; a pressure penetration component, and the pressure penetration component is used to allow fluorescent agents to penetrate into pores under the action of air pressure. The present invention arranges a cleaning component on the basis of existing fluorescent flaw detection, and specifically cleans the side wall of the main shaft to remove powder impurities accumulated in the crack part of the side wall of the main shaft, thereby avoiding the problem that the fluorescent agent cannot penetrate into the crack due to the presence of deposits in the crack; and a pressure penetration component is arranged, which can use the action of air pressure to assist the fluorescent agent to penetrate into the gap, thereby avoiding the problem that the fluorescent agent cannot penetrate into the gap due to the action of air pressure inside the gap.

Description

Technical Field

[0001] The invention relates to the technical field of flaw detection equipment, and in particular to a flaw detection system and method for a main shaft of a large wind turbine generator. Background Art

[0002] The main shaft of a large wind turbine is an important component that connects the hub of the wind turbine and the generator. Its main function is to transmit the force of wind acting on the blades to the generator, thereby completing the conversion process from wind energy to mechanical energy and then to electrical energy. The main shaft increases the lower speed input by the wind wheel to the speed required by the generator through a speed-increasing gearbox to meet the needs of the generator's working characteristics.

[0003] During the production process of large wind turbine main shafts, they usually need to be inspected. The fluorescent flaw detection technology is based on the property of fluorescent substances to emit light under ultraviolet light. During the flaw detection process, a penetrant containing fluorescent dyes is first infiltrated into tiny cracks or defects on the surface of the workpiece (i.e., the wind turbine main shaft). Then, the excess penetrant on the surface is removed by cleaning, and an adsorbent is applied to allow the fluorescent oil in the defect to seep out of the surface. Finally, under the irradiation of an ultraviolet lamp (also called a fluorescent flaw detection lamp), yellow-green fluorescent spots or stripes will appear at the defect, thereby realizing the detection and judgment of the defect.

[0004] like Fig.11 As shown, a is the main shaft of a large wind turbine, b is the situation where the wound of the main shaft is blocked by metal powder, the shaded part is the blocked powder, c is the situation where the fluorescent agent cannot penetrate due to the internal pressure of the wound, the shaded part is the fluorescent agent, and the direction of the arrow is the direction of the action of air pressure on the fluorescent agent. During the milling or other processing of the wind turbine main shaft, a large amount of metal powder will be generated due to the cutting and friction of the metal material. When the milling reaches the crack position, the powder will accumulate in the crack. There is a certain adhesion between the metal powder and the workpiece material, especially in the tiny space of the crack. Due to the influence of surface tension and intermolecular force, the powder particles are more likely to adhere to the crack wall and are not easy to fall off. In addition, the cutting force generated during the milling process squeezes some powder particles into the crack, increasing its embedding depth and stability, so that the crack is "filled" with metal powder and cannot fall out naturally. Since it is compacted during the milling process, it is not easy for the staff to find it. Furthermore, the fluorescent agent cannot penetrate into the crack during the fluorescent flaw detection process; in addition, even if the blockage at the crack is cleared, for the notch with a smaller diameter, due to the influence of the air pressure in the hole, the fluorescent agent cannot easily penetrate into the hole, making it difficult to achieve the ideal flaw detection effect. Summary of the invention

[0005] The purpose of the present invention is to provide a large wind turbine main shaft flaw detection system and method to solve the problem that metal powder is squeezed into cracks during the main shaft processing process, resulting in the inability of fluorescent agent to penetrate into the cracks during the fluorescent flaw detection process.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A large wind turbine main shaft flaw detection system comprises a frame, the inner side of which is fixedly connected to a bottom plate; one side of the frame is fixedly connected to a controller; it also comprises: a cleaning component, which is arranged on the top of the bottom plate and is used to clear crack blockages; a pressure penetration component, which is used to allow fluorescent agent to penetrate into pores under the action of air pressure; an imaging component, which is fixedly installed on the top of the bottom plate and is used to spray the developer on the main shaft soaked in fluorescent agent; an ultraviolet lamp, which is used to irradiate the surface of the main shaft for imaging; a top plate is fixedly installed on the top of the frame, a through groove is opened on the top plate, and a shading strip is arranged on the side of the frame, and the cleaning component, the pressure penetration component, the imaging component and the ultraviolet lamp are all electrically connected to the controller.

[0008] By adopting the above technical scheme, a cleaning component is set on the basis of the existing fluorescent flaw detection, and the side wall of the main shaft is specially cleaned to remove the powder impurities accumulated in the cracks of the side wall of the main shaft, thereby avoiding the problem that the fluorescent agent cannot penetrate into the cracks due to the presence of deposits in the cracks; and a pressure penetration component is set, which can use the air pressure to assist the fluorescent agent to penetrate into the notch, thereby avoiding the problem that the fluorescent agent cannot penetrate due to the internal air pressure at the notch position, greatly improving the effect of the fluorescent agent on the main shaft cracks.

[0009] A further improvement of the technical solution of the present invention is that the cleaning component includes a supporting shaft rotatably connected to the top of the base plate, a turntable is fixedly connected to the top of the supporting shaft, a cavity is provided inside the turntable, the top of the turntable is used to place the main shaft, an annular plate is fixedly connected to the top of the turntable, the inner part of the annular plate matches the shape of the outer wall of the main shaft, a clamp is installed on the top of the turntable, a transmission box is fixedly connected to the bottom of the base plate, the bottom of the supporting shaft passes through the bottom of the transmission box, a driven gear is fixedly connected to the outside of the supporting shaft and located inside the transmission box, a driving motor is fixedly installed on the top of the base plate, the output end of the driving motor extends to the inside of the transmission box and is fixedly connected to a driving gear, and the driving gear is meshed with the driven gear.

[0010] By adopting the above technical scheme, before coating with fluorescent agent, the main shaft is first placed upright on the turntable with its larger end at the bottom and fixed with a clamp; then the driving motor is controlled to drive the active gear to rotate, and the driven gear is driven to rotate through meshing, so that the support shaft and the turntable rotate, and the turntable is rotated at high speed, which drives the main shaft to rotate at high speed in the circumferential direction, so that the powder in the crack is thrown out under the action of centrifugal force, thereby completing the cleaning.

[0011] A further improvement of the technical solution of the present invention is that the cleaning component also includes a mounting frame, the mounting frame is fixedly connected to the position of the support shaft located in the transmission box, the inner side of the mounting frame is slidably connected with a slide rod, one end of the slide rod is fixedly connected with a counterweight block, the end of the slide rod away from the counterweight block extends to the outside of the mounting frame and is fixedly connected with the mounting block, the side of the mounting block away from the slide rod is connected with a spherical friction block by screws, the outer side of the slide rod is sleeved with a spring, the bottom of the inner wall of the transmission box is provided with an annular groove, the inside of the annular groove is installed with a friction ring by screws, the inner side of the friction ring and the outer side of the spherical friction block are both set to rough surfaces, and the spherical friction block is used in conjunction with the friction ring.

[0012] By adopting the above technical solution, a sliding rod that can slide on the mounting frame is set. When the support shaft rotates at a faster speed, the counterweight block will generate a larger centrifugal force and push the sliding rod to slide, squeezing the spring, and at the same time making the spherical friction block contact the inner wall of the annular groove. Since the contact parts of the two are set as rough surfaces, the two will slide relative to each other and produce high-frequency jitter during high-speed rotation, so that the main shaft will also jitter at a high frequency during the centrifugal process, thereby vibrating and throwing out the powder, greatly improving the blockage treatment effect.

[0013] A further improvement of the technical solution of the present invention is that the pressure penetration component includes an air pump fixedly installed on the frame, a lifting structure is fixedly installed on the inner side of the frame, a fixed frame is fixedly connected to the movable end of the lifting structure, the lifting structure is used to control the lifting of the fixed frame, a processing tank is fixedly connected to the fixed frame, a sealing ring is fixedly connected to the top of the turntable, an annular groove for extrusion matching with the sealing ring is opened on the periphery of the bottom of the processing tank, a boss matched with the end of the main shaft is arranged on the top of the inner wall of the processing tank, the output end of the air pump is connected to the top of the processing tank through a pipeline, a filling pipe is arranged on the top of the processing tank, the filling pipe is connected to the external fluorescent agent holding container through a pipeline, and an electric valve is arranged on the pipeline, a collecting plate is fixedly connected to the top of the inner side of the turntable, a plurality of collecting pipes are arranged between the top of the turntable and the inside of the collecting plate, a water outlet pipe is arranged at the central position of the bottom of the collecting plate, a drain pipe is fixedly connected to the bottom of the transmission box, the support shaft is a hollow shaft, the top of the drain pipe extends to the inside of the turntable through the support shaft and a rotating joint is arranged between the drain pipe and the water outlet pipe, and an electric valve is arranged on the drain pipe.

[0014] By adopting the above technical solution, by setting up an air pump, negative pressure can be drawn into the processing tank before injecting the fluorescent agent into the processing tank, so that the main shaft is in a negative pressure environment, so that the processing tank and the turntable are adsorbed more tightly, including the inside of the notch is also in a negative pressure environment, and the fluorescent agent is injected into the processing tank based on the negative pressure environment, so that the fluorescent agent is naturally sucked into the processing tank under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch, greatly improving the adhesion effect of the fluorescent agent.

[0015] A further improvement of the technical solution of the present invention is that: a water spray pipe is arranged at the top of the inner side of the processing tank, a plurality of nozzles are equidistantly arranged on one side of the water spray pipe, the top of the water spray pipe extends to the top of the processing tank, a water pump is fixedly installed on the frame, the output end of the water pump is connected to the top of the water spray pipe through a pipe, and the input end of the water pump is connected to an external water source through a pipe; a spray pipe is also arranged at the top of the inner side of the processing tank, a plurality of nozzles are also equidistantly arranged on one side of the spray pipe, and the spray pipe is connected to the developing component through a pipe.

[0016] By adopting the above technical scheme, since the main shaft itself can rotate, a fixed water spray pipe and nozzle are set up and connected to the water pump. When cleaning is needed, the water pump is controlled to pump water and spray it onto the main shaft through the water spray pipe and nozzle, thereby achieving flushing. Since the processing tank remains fixed and does not rotate, and the main shaft can rotate with the turntable, comprehensive flushing can be achieved; by setting up a spray pipe, the developer can be sprayed from the nozzle position onto the main shaft in cooperation with the developing component, thereby performing the developing operation.

[0017] A further improvement of the technical solution of the present invention is that: the top of the base plate is fixedly connected to a support frame, the top of the support frame is fixedly connected to a fan, the top of the support frame is also fixedly connected to an air duct frame, and the central position inside the air duct frame is fixedly connected to a guide plate.

[0018] By adopting the above technical solution, a fan is set to blow air directly towards the main shaft, and an air duct frame and a guide plate are set to guide the air, so that the wind can be blown out from the tangent direction of the two farthest points of the main shaft. On the one hand, the wind can be used to achieve a slight powder processing effect, and on the other hand, the separated powder can be blown away, thereby reducing the problem of powder settling downwards and affecting subsequent operations.

[0019] A further improvement of the technical solution of the present invention is that a load bearing is arranged on the top of the base plate, the stator part of the load bearing is fixedly connected to the base plate, the rotor part of the load bearing is fixedly connected to the bottom of the turntable, and the support shaft is located inside the load bearing and does not contact each other.

[0020] By adopting the above technical solution, a load bearing is added on the basis of the support provided by the original support shaft. The diameter of the load bearing is relatively large and close to the turntable. Its rotor is connected to the turntable, and the stator is connected to the base plate. This can ensure relative rotation while providing auxiliary support to the edge of the turntable, greatly improving the stability of the turntable during rotation.

[0021] A further improvement of the technical solution of the present invention is that an inclined transition portion is provided on the top of the inner side of the annular plate, and an annular anti-overflow plate is fixedly connected to the top of the annular plate.

[0022] By adopting the above technical solution and arranging the anti-overflow plate, protection can be provided when flushing and spraying the developer, thereby reducing the splashing of liquid.

[0023] A method for flaw detection of a main shaft of a large wind turbine generator comprises the following steps:

[0024] S1. Place the spindle upright, shake it at high frequency until the powder stuck in the gap is loosened, and rotate the spindle at high speed until the powder is thrown out;

[0025] Remove the powder impurities accumulated in the cracks on the side wall of the spindle, thereby avoiding the problem that the fluorescent agent cannot penetrate into the cracks due to the accumulation of impurities in the cracks;

[0026] S2. Spray clean water on the main shaft and rotate the main shaft to achieve flushing. After flushing, air dry;

[0027] S3, cover the processing tank on the main shaft so that the outer wall of the main shaft is in a closed chamber, and the chamber is negatively pressurized until the gap outside the main shaft is in a negative pressure environment, and then introduce a fluorescent agent into the processing tank, so that the fluorescent agent penetrates into the gap under the action of negative pressure;

[0028] Before injecting the fluorescent agent into the processing tank, negative pressure is first drawn into the processing tank, so that the main shaft is in a negative pressure environment, so that the processing tank and the turntable are more closely adsorbed, including the inside of the notch is also in a negative pressure environment, and the fluorescent agent is injected into the processing tank based on the negative pressure environment, so that the fluorescent agent is naturally sucked into the processing tank under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch;

[0029] S4, drying the excess fluorescent agent on the outer side of the main shaft, and air-drying the fluorescent agent attached to the outer side of the main shaft;

[0030] S5, spraying developer onto the outer side of the spindle;

[0031] S6. Use ultraviolet light to illuminate the spindle and observe the location and shape of the spindle defects.

[0032] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0033] 1. The present invention provides a cleaning component on the basis of the existing fluorescent flaw detection, and specifically cleans the side wall of the main shaft to remove the powder impurities accumulated in the cracks of the side wall of the main shaft, thereby avoiding the problem that the fluorescent agent cannot penetrate into the cracks due to the deposits in the cracks; and provides a pressure penetration component, which can use the air pressure to assist the fluorescent agent to penetrate into the notch, thereby avoiding the problem that the fluorescent agent cannot penetrate into the notch due to the air pressure inside the notch, greatly improving the effect of the fluorescent agent on the cracks of the main shaft.

[0034] 2. The present invention provides a sliding rod that can slide on the mounting frame. When the support shaft rotates at a faster speed, the counterweight block will generate a larger centrifugal force and push the sliding rod to slide, squeezing the spring, and at the same time making the spherical friction block contact the inner wall of the annular groove. Since the contact parts of the two are both set as rough surfaces, the two will slide relative to each other and generate high-frequency jitter during high-speed rotation, so that the main shaft will also jitter at a high frequency during the centrifugal process, thereby vibrating and throwing out the powder, greatly improving the blockage treatment effect.

[0035] 3. Before injecting the fluorescent agent into the processing tank, the present invention first draws negative pressure into the processing tank, so that the main shaft is in a negative pressure environment, so that the processing tank and the turntable are adsorbed more tightly, including the inside of the notch is also in a negative pressure environment, and the fluorescent agent is injected into the processing tank based on the negative pressure environment, so that the fluorescent agent is naturally sucked into the processing tank under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch, greatly improving the adhesion effect of the fluorescent agent.

[0036] 4. The main shaft is driven to rotate by the turntable, and its high-speed rotation can be used to generate centrifugal force to throw out powder impurities during the cleaning process; the nozzle can be used to spray water during the cleaning process to achieve comprehensive flushing, and the main shaft can be driven to rotate slowly by the turntable during the observation process to facilitate all-round observation, which greatly facilitates practical applications.

[0037] 5. By setting the fan to blow air directly towards the main shaft, and setting the air duct frame and guide plate to guide the air, the wind can be blown out from the tangent direction of the two farthest points of the main shaft. On the one hand, the wind can be used to achieve a slight powder processing effect, and on the other hand, the separated powder can be blown away, thereby reducing the problem of powder settling downwards and affecting subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the lifting structure of the present invention in the lowest position (with the top plate and shading strips hidden);

[0041] Figure 3 This is a schematic diagram of the structure of the lifting structure of the present invention in the highest position (with the top plate and shading strips hidden);

[0042] Figure 4 It is a schematic diagram of the structure of the present invention in section;

[0043] Figure 5 It is a structural schematic diagram of the processing tank of the present invention;

[0044] Figure 6 It is a schematic diagram of the installation structure of the turntable of the present invention;

[0045] Figure 7 It is a schematic diagram of the internal structure of the transmission box of the present invention;

[0046] Figure 8 It is a schematic diagram of the installation structure of the friction ring of the present invention;

[0047] Fig. 9 It is a structural schematic diagram of the air duct frame and the guide plate of the present invention;

[0048] Fig.10 For the present invention Figure 4 Enlarged view of point A in the middle;

[0049] Fig.11 This is a schematic diagram of the location of the spindle wound in the prior art.

[0050] In the figure: 1, frame; 2, bottom plate; 3, shading strip; 4, imaging component; 5, controller; 6, ultraviolet lamp; 7, lifting structure; 8, fixed frame; 9, processing tank; 10, support shaft; 11, turntable; 12, annular plate; 13, top plate; 14, fixture; 15, collecting plate; 16, water outlet pipe; 17, manifold; 18, sealing ring; 19, driven gear; 20, driving gear; 21, driving motor; 22, air pump Pump; 23. Water pump; 24. Water spray pipe; 25. Spray pipe; 27. Boss; 28. Transmission box; 29. ​​Drain pipe; 30. Annular groove; 31. Friction ring; 32. Mounting frame; 33. Slide rod; 34. Mounting block; 35. Spherical friction block; 36. Spring; 37. Counterweight; 38. Load bearing; 39. Duct frame; 40. Guide plate; 41. Overflow plate; 42. Fan; 43. Support frame; 44. Filling pipe. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with embodiments:

[0052] Example 1

[0053] like Figure 1 , Figure 2 and Figure 4 As shown, the present invention provides a large-scale wind turbine main shaft flaw detection system, including a frame 1, the inner side of the frame 1 is fixedly connected to a bottom plate 2; one side of the frame 1 is fixedly connected to a controller 5; it also includes: a cleaning component, the cleaning component is arranged on the top of the bottom plate 2, and the cleaning component is used to clear crack blockage; a pressure penetration component, the pressure penetration component is used to make the fluorescent agent penetrate into the pores under the action of air pressure; an imaging component 4, the imaging component 4 is fixedly installed on the top of the bottom plate 2, and the imaging component 4 is used to spray the developer on the main shaft soaked in the fluorescent agent; an ultraviolet lamp 6, the ultraviolet lamp 6 is used to irradiate the main shaft surface for imaging; a top plate 13 is fixedly installed on the top of the frame 1, and a through groove is opened on the top plate 13, and a shading strip 3 is arranged on the side of the frame 1, and the cleaning component, the pressure penetration component, the imaging component 4 and the ultraviolet lamp 6 are all electrically connected to the controller 5.

[0054] The developing component 4 is a developer spraying device containing developer, and the output position is connected with the main shaft placement position through a pipeline.

[0055] In this embodiment, a cleaning component is provided on the basis of the existing fluorescent flaw detection, and the side wall of the main shaft is specially cleaned to remove the powder impurities accumulated in the cracks of the side wall of the main shaft, thereby avoiding the problem that the fluorescent agent cannot penetrate into the cracks due to the presence of deposits in the cracks; and a pressure penetration component is provided, which can use the air pressure to assist the fluorescent agent to penetrate into the notch, thereby avoiding the problem that the fluorescent agent cannot penetrate into the notch due to the internal air pressure at the notch position, greatly improving the effect of the fluorescent agent on the cracks of the main shaft.

[0056] Among them, the shading strip 3, the top plate 13 and a side of the frame 1 are provided with a shield, which can provide a darker light environment for the inside of the frame 1 to facilitate subsequent ultraviolet irradiation observation.

[0057] like Figure 4 and Figure 5 As shown, preferably, the cleaning component includes a support shaft 10 rotatably connected to the top of the base plate 2, a turntable 11 is fixedly connected to the top of the support shaft 10, the turntable 11 has a cavity inside, the top of the turntable 11 is used to place the main shaft, the top of the turntable 11 is fixedly connected to the annular plate 12, the inside of the annular plate 12 matches the shape of the outer wall of the main shaft, a clamp 14 is installed on the top of the turntable 11, the bottom of the base plate 2 is fixedly connected to a transmission box 28, the bottom of the support shaft 10 passes through the bottom of the transmission box 28, a driven gear 19 is fixedly connected to the outside of the support shaft 10 and located inside the transmission box 28, a drive motor 21 is fixedly installed on the top of the base plate 2, the output end of the drive motor 21 extends to the inside of the transmission box 28 and is fixedly connected to a driving gear 20, and the driving gear 20 is meshed with the driven gear 19.

[0058] In this embodiment, specifically, before coating with fluorescent agent, the main shaft is first placed upright on the turntable 11 with its larger end at the bottom, and fixed with a clamp 14; then the driving motor 21 is controlled to drive the driving gear 20 to rotate, and the driven gear 19 is driven to rotate through meshing, so that the support shaft 10 and the turntable 11 are rotated, and by rotating the turntable 11 at high speed, the main shaft is driven to rotate at high speed in the circumferential direction, so that the powder in the crack is thrown out under the action of centrifugal force, thereby completing the cleaning.

[0059] Among them, the clamp 14 is an automated hydraulic clamp 14.

[0060] In addition, during the observation of the spindle after all operations are completed, in order to reduce the workload of the operator, the turntable 11 can be controlled to rotate slowly, and the operator can stand in a fixed position for observation.

[0061] like Figure 4 , Figure 7 and Figure 8 As shown, preferably, the cleaning component also includes a mounting frame 32, the mounting frame 32 is fixedly connected to the position of the support shaft 10 located in the transmission box 28, the inner side of the mounting frame 32 is slidably connected with a slide rod 33, one end of the slide rod 33 is fixedly connected with a counterweight block 37, the end of the slide rod 33 away from the counterweight block 37 extends to the outside of the mounting frame 32 and is fixedly connected with a mounting block 34, the side of the mounting block 34 away from the slide rod 33 is connected with a spherical friction block 35 by screws, the outer side of the slide rod 33 is sleeved with a spring 36, an annular groove 30 is provided at the bottom of the inner wall of the transmission box 28, a friction ring 31 is installed inside the annular groove 30 by screws, the inner side of the friction ring 31 and the outer side of the spherical friction block 35 are both set to rough surfaces, and the spherical friction block 35 is used in conjunction with the friction ring 31.

[0062] Since powder impurities are squeezed and clogged in cracks during operations such as turning and milling, it may be difficult to completely remove them using only centrifugal force.

[0063] In this embodiment, by providing a slide bar 33 that can slide on the mounting frame 32, when the support shaft 10 rotates at a high speed, the counterweight block 37 will generate a large centrifugal force and push the slide bar 33 to slide, squeezing the spring 36, and at the same time making the spherical friction block 35 contact the inner wall of the annular groove 30. Since the contact parts of the two are both set as rough surfaces, the two will slide relative to each other and generate high-frequency jitter during high-speed rotation, so that the main shaft will also jitter at a high frequency during the centrifugal process, so that the powder will be shaken and thrown out, which greatly improves the blockage treatment effect;

[0064] The above design ensures that when the rotation speed of the support shaft 10 is slow, the counterweight 37 is not sufficient to squeeze the slide bar 33 outward until the spherical friction block 35 contacts the annular groove 30, thereby ensuring that no shaking occurs when the turntable 11 rotates slowly for observation, thereby improving the observation effect.

[0065] Example 2

[0066] like Figure 3 , Figure 4 and Figure 5 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the pressure permeation component includes an air pump 22 fixedly mounted on the frame 1, a lifting structure 7 is fixedly mounted on the inner side of the frame 1, a movable end of the lifting structure 7 is fixedly connected to a fixed frame 8, the lifting structure 7 is used to control the lifting of the fixed frame 8, a processing tank 9 is fixedly connected to the fixed frame 8, a sealing ring 18 is fixedly connected to the top of the turntable 11, an annular groove 30 for extrusion-matching with the sealing ring 18 is provided on the periphery of the bottom of the processing tank 9, a boss 27 adapted to the end of the main shaft is provided on the top of the inner wall of the processing tank 9, and the output end of the air pump 22 is connected to the top of the processing tank 9. The processing tank 9 is connected through a pipeline, and a filling pipe 44 is arranged on the top of the processing tank 9. The filling pipe 44 is connected with the external fluorescent agent holding container through a pipeline, and an electric valve is arranged on the pipeline. The top of the inner side of the turntable 11 is fixedly connected with a collecting plate 15, and a plurality of collecting pipes 17 are arranged between the top of the turntable 11 and the inside of the collecting plate 15. An outlet pipe 16 is arranged at the central position of the bottom of the collecting plate 15, and a drain pipe 29 is fixedly connected with the bottom of the transmission box 28. The support shaft 10 is a hollow shaft. The top of the drain pipe 29 extends to the inside of the turntable 11 through the support shaft 10 and a rotating joint is arranged between the drain pipe 29 and the outlet pipe 16, and an electric valve is arranged on the drain pipe 29.

[0067] For the notch with a smaller diameter, due to the influence of the air pressure in the hole, the fluorescent agent cannot easily penetrate into the hole, making it difficult to achieve the ideal flaw detection effect;

[0068] In this embodiment, by providing an air pump 22, negative pressure can be drawn into the processing tank 9 before injecting the fluorescent agent into the processing tank 9, so that the main shaft is in a negative pressure environment, so that the processing tank 9 and the turntable 11 are adsorbed more tightly, including the interior of the notch is also in a negative pressure environment, and the fluorescent agent is injected into the processing tank 9 based on the negative pressure environment, so that the fluorescent agent is naturally sucked into the processing tank 9 under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch, greatly improving the adhesion effect of the fluorescent agent.

[0069] Among them, the two ends of the main shaft are closed, and the ends are tightly fitted with the contact parts, so that the fluorescent agent cannot reach the end position, reducing the difficulty of subsequent cleaning.

[0070] Example 3

[0071] like Figure 4 and Figure 5 As shown, on the basis of Example 2, the present invention provides a technical solution: preferably, a water spray pipe 24 is provided at the top of the inner side of the processing tank 9, a plurality of nozzles are equidistantly provided on one side of the water spray pipe 24, the top of the water spray pipe 24 extends to the top of the processing tank 9, a water pump 23 is fixedly installed on the frame 1, the output end of the water pump 23 is connected to the top of the water spray pipe 24 through a pipeline, and the input end of the water pump 23 is connected to an external water source through a pipeline; a spray pipe 25 is also provided at the top of the inner side of the processing tank 9, a plurality of nozzles are also equidistantly provided on one side of the spray pipe 25, and the spray pipe 25 is connected to the developing component 4 through a pipeline.

[0072] During the flaw detection operation, cleaning operations are required before and after the fluorescent agent is attached;

[0073] In this embodiment, based on the above design, since the main shaft itself can rotate, a fixed water spray pipe 24 and a nozzle are provided and connected to the water pump 23. When cleaning is required, the water pump 23 is controlled to pump water and spray it onto the main shaft through the water spray pipe 24 and the nozzle, thereby achieving flushing. Since the processing tank 9 remains fixed and does not rotate, and the main shaft can rotate with the turntable 11, comprehensive flushing can be achieved. During the process, the electric valve on the drain pipe 29 is opened to discharge the waste liquid;

[0074] By providing the spray pipe 25, the developer can be sprayed from the nozzle position onto the spindle in cooperation with the developing unit 4, thereby performing a developing operation.

[0075] The above processes are all based on the situation that the processing tank 9 and the turntable 11 are not in contact with each other, that is, the rotation of the turntable 11 does not apply torque to the processing tank 9 , and the turntable 11 rotates relative to the processing tank 9 .

[0076] Example 4

[0077] like Figure 2 and Fig. 9 As shown, based on Example 3, the present invention provides a technical solution: preferably, the top of the base plate 2 is fixedly connected to a support frame 43, the top of the support frame 43 is fixedly connected to a fan 42, the top of the support frame 43 is also fixedly connected to an air duct frame 39, and the central position of the inner side of the air duct frame 39 is fixedly connected to a guide plate 40.

[0078] During the cleaning process of the powder, the powder will be thrown out, and the powder falling down onto the rotating disk 11 will still affect the soaking effect;

[0079] In this embodiment, a fan 42 is arranged to blow air directly toward the main shaft, and an air duct frame 39 and a guide plate 40 are arranged to guide the air, so that the wind can be blown out from the tangent direction of the two farthest points of the main shaft. On the one hand, the wind can be used to achieve a slight powder processing effect, and on the other hand, the separated powder can be blown away, thereby reducing the problem of powder settling downwards and affecting subsequent operations.

[0080] like Figure 4 , Figure 6 and Fig.10 As shown, preferably, a load bearing 38 is provided on the top of the base plate 2, the stator portion of the load bearing 38 is fixedly connected to the base plate 2, the rotor portion of the load bearing 38 is fixedly connected to the bottom of the turntable 11, and the support shaft 10 is located inside the load bearing 38 and does not contact each other.

[0081] Since the main shaft of a large wind turbine is usually large and heavy, it is necessary to provide relatively stable support during centrifugal operation, otherwise instability may occur easily;

[0082] In this embodiment, a load bearing 38 is added on the basis of the support provided by the original support shaft 10. The diameter of the load bearing 38 is relatively large and close to the turntable 11. Its rotor is connected to the turntable 11, and the stator is connected to the base plate 2. This ensures relative rotation while providing auxiliary support to the edge of the turntable 11, thereby greatly improving the stability of the turntable 11 during rotation.

[0083] like Figure 4 , Figure 6 and Fig.10 As shown, preferably, an inclined transition portion is provided at the top of the inner side of the annular plate 12 , and an annular anti-overflow plate 41 is fixedly connected to the top of the annular plate 12 .

[0084] Since the processing tank 9 and the rotating disk 11 are not in contact during washing and spraying of the developer, there is a certain gap between the two, which makes it easy for the liquid to splash out;

[0085] In this embodiment, the anti-overflow plate 41 is provided to provide protection when flushing and spraying the developer, thereby reducing the splashing of liquid.

[0086] A method for flaw detection of a main shaft of a large wind turbine generator comprises the following steps:

[0087] S1. Place the spindle upright, shake it at high frequency until the powder stuck in the gap is loosened, and rotate the spindle at high speed until the powder is thrown out;

[0088] Remove the powder impurities accumulated in the cracks on the side wall of the spindle, thereby avoiding the problem that the fluorescent agent cannot penetrate into the cracks due to the accumulation of impurities in the cracks;

[0089] S2. Spray clean water on the main shaft and rotate the main shaft to achieve flushing. After flushing, air dry;

[0090] S3, cover the processing tank 9 on the main shaft so that the outer wall of the main shaft is in a closed chamber, and the chamber is negatively pressurized until the gap outside the main shaft is in a negative pressure environment, and then introduce fluorescent agent into the processing tank 9, so that the fluorescent agent penetrates into the gap under the action of negative pressure;

[0091] Before injecting the fluorescent agent into the processing tank 9, negative pressure is first drawn into the processing tank 9, so that the main shaft is in a negative pressure environment, so that the processing tank 9 and the turntable 11 are more closely adsorbed, including the inside of the notch is also in a negative pressure environment, and the fluorescent agent is injected into the processing tank 9 based on the negative pressure environment, so that the fluorescent agent is naturally sucked into the processing tank 9 under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch;

[0092] S4, drying the excess fluorescent agent on the outer side of the main shaft, and air-drying the fluorescent agent attached to the outer side of the main shaft;

[0093] S5, spraying developer onto the outer side of the spindle;

[0094] S6. Irradiate the spindle with ultraviolet lamp 6 and observe the position and shape of the spindle defect at the same time.

[0095] The working principle of the large wind turbine main shaft flaw detection system and method is described in detail below.

[0096] like Figure 1-Figure 11 As shown, the main shaft is placed upright on the turntable 11, with its larger end at the bottom, and is fixed by a clamp 14; then the driving motor 21 is controlled to drive the driving gear 20 to rotate, and the driven gear 19 is driven to rotate through meshing, so that the support shaft 10 and the turntable 11 rotate, and the turntable 11 is driven to rotate at a high speed, so that the main shaft is driven to rotate at a high speed in the circumferential direction, so that the powder in the crack is thrown out under the action of centrifugal force, thereby completing the cleaning;

[0097] During the above centrifugal cleaning process, the support shaft 10 will also rotate at a relatively fast speed, so that the counterweight block 37 generates a large centrifugal force, and pushes the slide bar 33 to slide, compressing the spring 36, and at the same time making the spherical friction block 35 contact the inner wall of the annular groove 30. Since the contact parts of the two are both set as rough surfaces, the two will slide relative to each other and generate high-frequency jitter during the high-speed rotation process, so that the main shaft will also jitter at a high frequency during the centrifugal process, so as to disperse and throw out the powder, greatly improving the blockage treatment effect;

[0098] The fan 42 is controlled to work so as to blow air. The wind is blown out from the tangent direction of the two farthest points of the main axis under the guidance of the air duct frame 39 and the guide plate 40. On the one hand, the wind can be used to achieve a slight powder treatment effect, and on the other hand, the separated powder can be blown away.

[0099] Based on the above-mentioned rotation cleaning process, the lifting structure 7 can be synchronously controlled to work so that the processing tank 9 descends but does not contact the turntable 11. In this process, the fan 42 is controlled to stop working, and the water pump 23 is controlled to work to provide clean water to flush the main shaft to achieve cleaning;

[0100] After the above cleaning operation is completed, the water pump 23 is controlled to stop working, and the turntable 11 is kept rotating at a high speed to allow the water to be thrown out. The height of the treatment tank 9 is maintained at the initial stage so that when there is a lot of water, it will not be thrown around. After a period of time, the treatment tank 9 is raised, and the fan 42 is controlled to work while the turntable 11 is kept rotating to blow away the water for auxiliary air drying;

[0101] During the above process, the electric valve on the drain pipe 29 is always in the on state, and the electric valve is controlled to be closed after the above operation is completed;

[0102] After the above-mentioned air drying is completed, the turntable 11 is controlled to stop rotating, and at the same time, the lifting structure 7 is used to control the close contact between the processing tank 9 and the turntable 11, and a relatively closed chamber is formed under the action of the sealing ring 18, and the inside and outside of the main shaft are isolated, and the negative pressure is pumped into the processing tank 9 by controlling the air pump 22, so that the main shaft is in a negative pressure environment, so that the processing tank 9 and the turntable 11 are adsorbed more closely, including the inside of the notch is also in a negative pressure environment, and the air pump 22 is turned off after the negative pressure reaches a certain value, and the electric valve on the filling pipe 44 is controlled to open based on the negative pressure environment, so that the fluorescent agent is naturally injected into the processing tank 9 under the action of negative pressure, so that the fluorescent agent is naturally sucked into the processing tank 9 under the action of negative pressure. Since there is also negative pressure inside the notch, the fluorescent agent will be pressed into the inside of the notch, thereby improving the ability of the fluorescent agent to penetrate into the notch; the electric valve on the filling pipe 44 is controlled to be closed and maintained for a period of time, so that the outside of the main shaft can be fully soaked;

[0103] In order to reduce the use of fluorescent agent, a filler can be appropriately arranged inside the processing tank 9, but the filler does not contact the main shaft;

[0104] After the soaking is completed, the electric valve of the drain pipe 29 is controlled to open, and air enters. After the negative pressure is completely released, the fluorescent agent will begin to flow out. Then the processing tank 9 is controlled to be lifted a small distance, and the turntable 11 is controlled to rotate quickly again to throw away the excess fluorescent agent. At the same time, the fan 42 is controlled to work for auxiliary air drying. After the air drying is completed, the fan 42 is controlled to stop working;

[0105] After air drying, the developing component 4 is controlled to work, and the developer is provided to the spray tube 25 and sprayed out to the main shaft. During the process, the turntable 11 is controlled to rotate slowly, so as to achieve comprehensive spraying. After the spraying is completed, the developing component 4 is controlled to stop working, and the lifting structure 7 is controlled to work to lift the processing tank 9, the ultraviolet lamp 6 is controlled to work to irradiate the main shaft, and the turntable 11 is controlled to rotate slowly, and the operator observes the main shaft.

[0106] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A large wind turbine main shaft flaw detection system, comprising a frame (1), a bottom plate (2) fixedly connected to the inner side of the frame (1), and a controller (5) fixedly connected to one side of the frame (1); characterized in that: Also includes: A cleaning component, the cleaning component being arranged on the top of the bottom plate (2) and being used to clear blockages in the cracks; A pressure impregnation component, the pressure impregnation component is used to make the fluorescent agent penetrate into the pores under the action of gas pressure; An imaging component (4), the imaging component (4) being fixedly mounted on the top of the bottom plate (2), and the imaging component (4) being used to spray the imaging agent on the main shaft soaked in the fluorescent agent; An ultraviolet lamp (6), the ultraviolet lamp (6) being used to irradiate the surface of the spindle for imaging; A top plate (13) is fixedly mounted on the top of the frame (1), a through slot is provided on the top plate (13), and a shading strip (3) is provided on the side of the frame (1); The cleaning component comprises a support shaft (10) rotatably connected to the top of the base plate (2); a turntable (11) is fixedly connected to the top of the support shaft (10); the turntable (11) has a cavity inside; the top of the turntable (11) is used to place the main shaft; the top of the turntable (11) is fixedly connected to an annular plate (12); the inside of the annular plate (12) matches the shape of the outer wall of the main shaft; a clamp (14) is installed on the top of the turntable (11); the bottom of the base plate (2) is fixedly connected to a transmission box (28); the bottom of the support shaft (10) extends to the bottom of the transmission box (28); a driven gear (19) is fixedly connected to the outside of the support shaft (10) and inside the transmission box (28); a driving motor (21) is fixedly installed on the top of the base plate (2); the output end of the driving motor (21) extends to the inside of the transmission box (28) and is fixedly connected to a driving gear (20); the driving gear (20) is meshingly connected to the driven gear (19).

2. A large wind turbine main shaft flaw detection system according to claim 1, characterized in that: The cleaning component further comprises a mounting frame (32), wherein the mounting frame (32) is fixedly connected to a portion of the support shaft (10) located in the transmission box (28), a slide rod (33) is slidably connected to the inner side of the mounting frame (32), one end of the slide rod (33) is fixedly connected to a counterweight block (37), one end of the slide rod (33) away from the counterweight block (37) extends to the outer side of the mounting frame (32) and is fixedly connected to a mounting block (34), a side of the mounting block (34) away from the slide rod (33) is connected to a spherical friction block (35) by screws, a spring (36) is sleeved on the outer side of the slide rod (33), an annular groove (30) is provided at the bottom of the inner wall of the transmission box (28), a friction ring (31) is installed inside the annular groove (30) by screws, the inner side of the friction ring (31) and the outer side of the spherical friction block (35) are both arranged as rough surfaces, and the spherical friction block (35) is used in conjunction with the friction ring (31).

3. A large wind turbine main shaft flaw detection system according to claim 2, characterized in that: The pressure impregnation component comprises an air pump (22) fixedly mounted on a frame (1); a lifting structure (7) is fixedly mounted on the inner side of the frame (1); a movable end of the lifting structure (7) is fixedly connected to a fixed frame (8); the lifting structure (7) is used to control the lifting of the fixed frame (8); a treatment tank (9) is fixedly connected to the fixed frame (8); a sealing ring (18) is fixedly connected to the top of the turntable (11); an annular groove (30) for extrusion-matching with the sealing ring (18) is provided on the periphery of the bottom of the treatment tank (9); a boss (27) adapted to the end of the main shaft is provided on the top of the inner wall of the treatment tank (9); an output end of the air pump (22) is connected to the top of the treatment tank (9) via a pipeline; the treatment tank (9) ) is provided with a filling pipe (44) at the top, the filling pipe (44) is connected to an external fluorescent agent storage container through a pipe, and an electric valve is provided on the pipe, the top of the inner side of the turntable (11) is fixedly connected to a collecting plate (15), a plurality of collecting pipes (17) are provided between the top of the turntable (11) and the inside of the collecting plate (15), a water outlet pipe (16) is provided at the central position of the bottom of the collecting plate (15), the bottom of the transmission box (28) is fixedly connected to a drain pipe (29), the support shaft (10) is a hollow shaft, the top of the drain pipe (29) extends through the support shaft (10) to the inside of the turntable (11) and a rotating joint is provided between the drain pipe (29) and the water outlet pipe (16), and an electric valve is provided on the drain pipe (29).

4. A large wind turbine main shaft flaw detection system according to claim 3, characterized in that: A water spray pipe (24) is arranged at the top of the inner side of the processing tank (9), and a plurality of nozzles are arranged at equal intervals on one side of the water spray pipe (24). The top of the water spray pipe (24) extends to the top of the processing tank (9). A water pump (23) is fixedly mounted on the frame (1), and the output end of the water pump (23) is connected to the top of the water spray pipe (24) through a pipeline, and the input end of the water pump (23) is connected to an external water source through a pipeline. A spray pipe (25) is also arranged at the top of the inner side of the processing tank (9), and a plurality of nozzles are also arranged at equal intervals on one side of the spray pipe (25), and the spray pipe (25) is connected to the developing component (4) through a pipeline.

5. A large wind turbine main shaft flaw detection system according to claim 4, characterized in that: The top of the bottom plate (2) is fixedly connected to a support frame (43), the top of the support frame (43) is fixedly connected to a fan (42), the top of the support frame (43) is also fixedly connected to an air duct frame (39), and the central position inside the air duct frame (39) is fixedly connected to a guide plate (40).

6. A large wind turbine main shaft flaw detection system according to claim 5, characterized in that: A load bearing (38) is provided on the top of the base plate (2); a stator portion of the load bearing (38) is fixedly connected to the base plate (2); a rotor portion of the load bearing (38) is fixedly connected to the bottom of the turntable (11); and the support shaft (10) is located inside the load bearing (38) and does not contact each other.

7. A large wind turbine main shaft flaw detection system according to claim 6, characterized in that: An inclined transition portion is provided at the top of the inner side of the annular plate (12), and an annular anti-overflow plate (41) is fixedly connected to the top of the annular plate (12).

8. A method for flaw detection of a main shaft of a large wind turbine generator, applicable to a flaw detection system of a main shaft of a large wind turbine generator as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Place the spindle upright, shake it at high frequency until the powder stuck in the gap is loosened, and rotate the spindle at high speed until the powder is thrown out; S2. Spray clean water on the main shaft and rotate the main shaft to achieve flushing. After flushing, air dry; S3, covering the processing tank (9) on the main shaft so that the outer wall of the main shaft is in a closed chamber, and the chamber is negatively pressurized until the gap outside the main shaft is in a negative pressure environment, and then a fluorescent agent is introduced into the processing tank (9), so that the fluorescent agent penetrates into the gap under the action of the negative pressure; S4, drying the excess fluorescent agent on the outer side of the main shaft, and air-drying the fluorescent agent attached to the outer side of the main shaft; S5, spraying developer onto the outer side of the spindle; S6. Use ultraviolet light (6) to illuminate the spindle and observe the position and shape of the spindle defect.

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