A non-destructive testing device for surface defects of steam turbine blades

Abstract

This disclosure provides a non-destructive testing device for surface defects of steam turbine blades, comprising: a testing cart equipped with an adsorption and walking unit for moving on the blade surface, and a testing component for detecting surface defects of the blade; and a cleaning and adaptive bonding mechanism rotatably disposed on the testing cart. The cleaning and adaptive bonding mechanism includes a scraper unit capable of bonding to the blade surface, and an elastic connector connecting the scraper unit and the testing cart. When the testing cart moves on the blade surface, the scraper unit is configured to bond to the blade surface under the elastic action of the elastic connector, and scrape away oil and impurities from the blade surface.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of turbine blade inspection technology, specifically relating to a non-destructive testing device for surface defects of turbine blades. Background Technology

[0002] This device is a precision detection system that integrates advanced sensing technology and an automated platform. It typically uses high-resolution optical imaging as the core detection method. By using a wall-climbing robot to carry a miniature probe, it automatically scans the complex curved surface of the blade to achieve high-precision and high-efficiency assessment of the blade's condition. It is a key piece of equipment to ensure the safe operation of the generator set.

[0003] During the use of this device, the operator places the testing device at the inlet of the turbine before it is opened, and then starts the testing cart to move it over the surface of the blades after they have been worked. At this time, the small adsorption pump inside the testing cart alternately draws air through the small suction cups, allowing the testing cart to move and test on the blade surface. Since some oil and other impurities will be attached to the outer surface of the blades after they have been worked inside the turbine, the testing cart may become unstable or slip when it is attached to the blade surface by the small adsorption pump and the small suction cups. This reduces the stability of the device during moving and testing, and affects the testing quality and efficiency of the device when testing the damage to the blade surface.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a non-destructive testing device for surface defects of steam turbine blades.

[0006] One aspect of the embodiments of this disclosure provides a non-destructive testing device for surface defects in steam turbine blades, comprising:

[0007] The inspection vehicle is equipped with an adsorption-walking unit for moving on the blade surface, and an inspection assembly for detecting defects on the blade surface. It also includes:

[0008] A cleaning and adaptive bonding mechanism is rotatably mounted on the inspection vehicle. The cleaning and adaptive bonding mechanism includes a scraper unit capable of bonding to the surface of the blade, and an elastic connector connecting the scraper unit and the inspection vehicle.

[0009] When the inspection vehicle moves on the blade surface, the scraper unit is configured to adhere to the blade surface under the elastic action of the elastic connector and scrape off the oil and impurities on the blade surface.

[0010] Optionally, the cleaning and adaptive bonding mechanism includes a fixed plate fixedly connected to the testing vehicle, and a connecting plate connected to the fixed plate;

[0011] The scraper unit includes a connecting strip rotatably connected to the connecting plate, and an arc-shaped plate connected to the connecting strip;

[0012] The elastic connector includes a first elastic element disposed between the arc-shaped plate and the connecting strip, and a second elastic element connected between the arc-shaped plate and the connecting plate.

[0013] Optionally, the inner wall of the arc-shaped plate is provided with an arc-shaped groove, and the first elastic element is disposed in the arc-shaped groove;

[0014] A sliding block is provided on the connecting strip at the position corresponding to the arc plate. One end of the first elastic element is connected to the inner wall of the arc groove, and the other end is connected to the sliding block.

[0015] Optionally, one end of the second elastic element is connected to the inner wall of the arc-shaped plate, and the other end is connected to the connecting plate.

[0016] Optionally, it may also include an obstacle-crossing assistance mechanism, which includes:

[0017] A rotating assembly is rotatably connected to the scraper unit;

[0018] The swing assembly is slidably connected to the sliding groove on the top of the inspection vehicle and rotatably connected to the scraper unit.

[0019] Optionally, the rotating component includes:

[0020] An arc-shaped rod is rotatably connected to the scraper unit, and a moving groove is provided on the side wall of the arc-shaped rod;

[0021] A connecting block is connected to the side wall of the connecting plate, and the connecting block is slidably connected within the moving groove;

[0022] When the scraper unit is subjected to force and rotates downward, it drives the arc-shaped rod to move, so that the top of the arc-shaped rod abuts against and pushes the scraper unit, and assists its rotation.

[0023] Optionally, the oscillating component includes:

[0024] The movable block is slidably connected within the sliding groove;

[0025] The connecting rod is rotatably connected to the movable block;

[0026] One end of the fixed block is rotatably connected to the connecting rod, and the other end is rotatably connected to the scraper unit;

[0027] When the scraper unit rotates, the moving block is driven to slide in the sliding groove through the fixed block and the connecting rod.

[0028] Optionally, the bottom of the sliding groove is provided with an inclined surface, wherein when the moving block slides in the sliding groove, its movement trajectory is guided by the inclined surface.

[0029] Optionally, the adsorption walking unit includes an adsorption pump disposed on the testing vehicle and a suction cup connected to the adsorption pump, wherein the adsorption pump drives the testing vehicle to move by controlling the suction cup to perform alternating adsorption.

[0030] Optionally, the detection component includes a detector disposed inside the detection vehicle and a transmission head for transmitting detection data.

[0031] The beneficial effects of the embodiments of this disclosure include:

[0032] During the varying degrees of ascent of the multiple arc-shaped plates, the plates tilt around the sliding block at the curved surface of the blade. At this time, the multiple arc-shaped plates can adhere to the blade surface at the curved surface in an inclined manner, thereby scraping off oil and other impurities from the blade surface during subsequent movement. This reduces the likelihood of oil and other impurities adhering to the outer surface of the blades after a period of operation, which could cause the adsorption force of the device to be affected by oil and other impurities, leading to instability or slippage during movement. This ensures the stability of the device during movement detection and improves the overall quality and detection efficiency of the device when detecting damage to the blade surface. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a non-destructive testing device for surface defects of steam turbine blades according to an embodiment of the present disclosure;

[0034] Figure 2 This is a schematic diagram of the structure of a non-destructive testing device for surface defects of steam turbine blades according to another embodiment of the present disclosure;

[0035] Figure 3 This is a schematic diagram of the structure of a non-destructive testing device for surface defects of steam turbine blades, according to another embodiment of this disclosure.

[0036] Figure 4 This is a partial structural schematic diagram of a non-destructive testing device for surface defects of steam turbine blades according to an embodiment of the present disclosure;

[0037] Figure 5 This is a partial structural schematic diagram of a non-destructive testing device for surface defects of steam turbine blades according to another embodiment of this disclosure;

[0038] Figure 6 This is a partial structural schematic diagram of a surface defect non-destructive testing device for steam turbine blades, according to another embodiment of this disclosure.

[0039] Figure 7 This is a schematic diagram of the cleaning and adaptive bonding mechanism according to an embodiment of the present disclosure;

[0040] Figure 8 This is a schematic diagram of the cleaning and adaptive bonding mechanism according to another embodiment of the present disclosure;

[0041] Figure 9 for Figure 8 Enlarged structural diagram of region A in the middle;

[0042] Figure 10 This is a schematic diagram of the structure of an obstacle-crossing mechanism according to an embodiment of the present disclosure;

[0043] Figure 11 This is a schematic diagram of the structure of an auxiliary obstacle-crossing mechanism according to another embodiment of the present disclosure;

[0044] Figure 12 This is a structural schematic diagram of the motion state of the cleaning and adaptive bonding mechanism and the obstacle-crossing mechanism according to an embodiment of the present disclosure.

[0045] In the diagram, 1. Inspection vehicle; 101. Sliding groove; 102. Adsorption pump; 103. Suction cup; 11. Inspection assembly; 111. Detector; 112. Transmission head; 121. Fixing plate; 122. Connecting plate; 2. Cleaning and adaptive bonding mechanism; 22. Scraper unit; 211. Connecting strip; 212. Sliding block; 221. Arc plate; 222. Arc groove; 223. First elastic element; 224. Second elastic element; 3. Auxiliary obstacle crossing mechanism; 31. Rotating assembly; 311. Arc rod; 312. Moving groove; 313. Connecting block; 32. Swing assembly; 321. Moving block; 322. Connecting rod; 323. Fixing block. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0048] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0049] like Figure 1-12 As shown, a non-destructive testing device for surface defects of steam turbine blades includes:

[0050] The inspection vehicle 1 is equipped with an adsorption and travel unit for moving on the blade surface, and an inspection assembly 11 for detecting defects on the blade surface, and also includes:

[0051] A cleaning and adaptive bonding mechanism is rotatably mounted on the inspection vehicle 1. The cleaning and adaptive bonding mechanism includes a scraper unit capable of bonding to the surface of the blade, and an elastic connector connecting the scraper unit and the inspection vehicle 1.

[0052] When the inspection vehicle 1 moves on the blade surface, the scraper unit is configured to adhere to the blade surface under the elastic action of the elastic connector and scrape off the oil and impurities on the blade surface.

[0053] In this application, by setting a cleaning and adaptive bonding mechanism including a scraper unit and an elastic connector, the scraper unit can closely fit the curved surface of the blade when the inspection vehicle moves on the blade surface, effectively scraping off the oil and impurities on its surface. This solves the problem of unstable adsorption and slippage caused by oil on the inspection vehicle in the prior art, and significantly improves the movement stability and inspection efficiency during the inspection process.

[0054] In some embodiments, the cleaning and adaptive bonding mechanism includes a fixing plate 121 fixedly connected to the testing vehicle 1, and a connecting plate 122 connected to the fixing plate 121.

[0055] The scraper unit includes a connecting strip 211 rotatably connected to the connecting plate 122, and an arc-shaped plate 221 connected to the connecting strip 211.

[0056] The elastic connector includes a first elastic element 223 disposed between the arc-shaped plate 221 and the connecting strip 211, and a second elastic element 224 connected between the arc-shaped plate 221 and the connecting plate 122. Specifically, both the first elastic element 223 and the second elastic element 224 are arc-shaped springs.

[0057] In this application, a scraper unit consisting of a fixed plate 121, a connecting plate 122, a rotatable connecting strip 211, and an arc plate 221, along with a first elastic element 223 and a second elastic element 224, enables the arc plate 221 to adaptively and tightly conform to the complex blade surface under elastic action, effectively scraping off surface oil stains and ensuring the stability and cleaning effect of the inspection vehicle movement.

[0058] In some embodiments, the inner wall of the arc plate 221 is provided with an arc groove 222, and the first elastic element is disposed in the arc groove 222.

[0059] A sliding block 212 is provided on the connecting strip 211 at the position corresponding to the arc plate 221. One end of the first elastic element 223 is connected to the inner wall of the arc groove 222, and the other end is connected to the sliding block 212.

[0060] In this application, the arc plate 221 accommodates and positions the first elastic element 223 through the arc groove 222 and the sliding block 212, ensuring that the arc plate can achieve precise up-and-down floating and tilting under elastic action to adapt to the complex curved surface of the blade.

[0061] In some embodiments, one end of the second elastic element 224 is connected to the inner wall of the arc-shaped plate 221, and the other end is connected to the connecting plate 122.

[0062] In this application, the second elastic element 224 connects the arc plate 221 and the connecting plate 122 of the inspection vehicle. When the arc plate rotates, it provides auxiliary thrust and stores energy to help the inspection vehicle climb the blade connection end smoothly. At the same time, it buffers the reset impact and improves the stability and continuity of the equipment when passing through complex terrain.

[0063] In some embodiments, an obstacle-crossing assistance mechanism is also included, which includes a rotating component 31 and a swinging component 32.

[0064] The rotating component 31 is rotatably connected to the scraper unit, and the swing component 32 is slidably connected to the sliding groove 101 on the top of the inspection vehicle 1 and is rotatably connected to the scraper unit.

[0065] In this application, the rotating component 31 and the swing component 32 constitute an auxiliary obstacle crossing mechanism. The rotating component 31 is connected to the scraper unit, and the swing component 32 can slide in the sliding groove 101. The two work together to help the inspection vehicle smoothly cross the height difference between the blades.

[0066] In some embodiments, the rotating assembly 31 includes an arc-shaped rod 311 and a connecting block 313.

[0067] An arc-shaped rod 311 is rotatably connected to the scraper unit, and a moving groove 312 is provided on the side wall of the arc-shaped rod 311. A connecting block 313 is connected to the side wall of the connecting plate 122, and the connecting block 313 is slidably connected within the moving groove 312.

[0068] When the scraper unit is subjected to force and rotates downward, it drives the arc-shaped rod 311 to move, so that the top of the arc-shaped rod 311 abuts against and pushes the scraper unit, and assists its rotation.

[0069] In this application, when the scraper unit is rotated under pressure, the above design can effectively enhance the upward lifting force on the front of the inspection vehicle, thereby assisting the equipment to smoothly and efficiently cross the connection height difference between the blades.

[0070] In some embodiments, the swing assembly 32 includes a moving block 321, a connecting rod 322, and a fixed block 323.

[0071] The movable block 321 is slidably connected within the sliding groove 101, and the connecting rod 322 is rotatably connected to the movable block 321. One end of the fixed block 323 is rotatably connected to the connecting rod 322, and the other end is rotatably connected to the scraper unit.

[0072] When the scraper unit rotates, the moving block 321 is driven to slide in the sliding groove 101 by the fixed block 323 and the connecting rod 322.

[0073] In this application, the swing assembly 32, through the linkage of the moving block 321, the connecting rod 322 and the fixed block 323, can convert the reset force into the sliding of the moving block in the sliding groove when the scraper unit is reset, effectively buffering and suppressing the rebound of the inspection vehicle and ensuring its stable posture.

[0074] In some embodiments, the bottom of the sliding groove 101 is provided with an inclined surface, wherein when the moving block 321 slides in the sliding groove 101, its movement trajectory is guided by the inclined surface.

[0075] In this application, by setting the bottom of the sliding groove 101 as an inclined surface to guide the sliding trajectory of the moving block 321, the force applied to the detection vehicle 1 can be optimized to more effectively buffer the reset action and prevent rebound.

[0076] In some embodiments, the adsorption walking unit includes an adsorption pump 102 disposed on the detection vehicle 1 and a suction cup 103 communicating with the adsorption pump 102, wherein the adsorption pump 102 drives the detection vehicle 1 to move by controlling the suction cup 103 to perform alternating adsorption.

[0077] In this application, the adsorption walking unit controls the suction cup 103 to alternately adsorb the blade surface through the adsorption pump 102, providing the inspection vehicle 1 with stable and reliable wall movement capability and ensuring that the inspection process can continue.

[0078] In some embodiments, the detection component 11 includes a detector 111 disposed within the detection vehicle 1, and a transmission head 112 for transmitting detection data.

[0079] In this application, the detection component 11 integrates a detector 111 and a transmission head 112, realizing real-time scanning and wireless data transmission of defects on the blade surface, ensuring the timeliness and accuracy of the detection results.

[0080] For details, please refer to Figure 1-12 As shown, this application provides a non-destructive testing device for surface defects of steam turbine blades, including a testing vehicle 1. The top of the testing vehicle 1 is provided with a sliding groove 101, and the bottom of the sliding groove 101 is inclined.

[0081] Several small adsorption pumps 102 are fixedly connected inside the testing vehicle 1, and the bottom of the adsorption pumps 102 is connected to the bottom outer wall of the testing vehicle 1. Small suction cups 103 are fixedly connected to the bottom of the adsorption pumps 102, and the tops of the several suction cups 103 are fixedly connected to the top of the testing vehicle 1.

[0082] The obstacle crossing assist mechanism 3 includes:

[0083] The rotating component 31 is rotatably connected to the scraper unit 22 and is used to rotate when the scraper unit 22 moves.

[0084] The oscillating component 32 is slidably mounted inside the sliding groove 101 and is used to oscillate when the scraper unit 22 moves.

[0085] The detection assembly 11 includes a detector 111 fixedly connected inside the detection vehicle 1. A transmission head 112 is fixedly connected to the top of the detection vehicle 1. When the detection vehicle 1 is attached to the blade and moves, the detector 111 inside it will scan and detect the outer surface of the blade located at the bottom of the detection vehicle 1. The data collected by the detector 111 after scanning will be transmitted to the inside of the workbench located outside the turbine through the transmission head 112.

[0086] The cleaning and adaptive bonding mechanism 2 includes a fixed plate 121 fixedly connected inside the inspection vehicle 1. A connecting plate 122 is fixedly connected to the side wall of the fixed plate 121. When the inspection vehicle 1 moves on the blade surface, it will drive the fixed plate 121 and the connecting plate 122 located inside it to move.

[0087] The scraper unit 22 includes a connecting strip 211 rotatably connected to the end of the connecting plate 122 away from the fixed plate 121. Several sliding blocks 212 are fixedly connected to the side of the connecting strip 211 away from the connecting plate 122. When the connecting strip 211 moves, it pushes several arc-shaped plates 221 to move through the side wall. Since the bottom of the several arc-shaped plates 221 is in contact with the outer surface of the blade, the bottom of the several arc-shaped plates 221 will scrape off the oil and other impurities attached to the outer surface of the blade when the several arc-shaped plates 221 move.

[0088] The elastic connectors include a first elastic connector 223 and a second elastic connector 224. The scraper unit also includes an arc-shaped plate 221 disposed on the outer surface of the sliding block 212. An arc-shaped groove 222 is formed on the inner wall of the arc-shaped plate 221, and the first elastic element 223 is fixedly connected to the inner wall of the arc-shaped groove 222. The inner walls of the two arc-shaped plates 221 are rotatably connected to the second elastic element 224.

[0089] Among them, the inner walls of several arc-shaped plates 221 are rotatably connected to the side of the connecting strip 211 away from the connecting plate 122, and the side of the first elastic element 223 away from the arc-shaped groove 222 is fixedly connected to the outer surface of the sliding block 212.

[0090] Furthermore, both the first elastic element 223 and the second elastic element 224 are arc-shaped springs.

[0091] The ends of the two second elastic elements 224 away from the arc plate 221 are fixedly connected to the bottom of the connecting plate 122. When the arc plate 221 rises, it will apply a pushing force to the first elastic element 223 located inside the arc groove 222, causing the first elastic element 223 to contract and accumulate potential energy. When the first elastic element 223 contracts, it will apply a partial force to make the sliding block 212 push the connecting strip 211 to rotate slightly upward around the connecting plate 122.

[0092] The rotating assembly 31 includes an arc-shaped rod 311 rotatably connected to the side walls of the two arc-shaped plates 221. The side wall of the arc-shaped rod 311 is provided with a moving groove 312, and a connecting block 313 is slidably connected inside the moving groove 312.

[0093] Among them, the two connecting blocks 313 are fixedly connected to the side wall of the connecting plate 122. The rotation of the arc plate 221 will push the arc rod 311 on its inner wall to move in a ring around the connecting block 313. When the arc rod 311 moves, its top will contact the side wall of the arc plate 221 and apply a thrust to the side wall of the arc plate 221.

[0094] The swing assembly 32 includes a movable block 321 that is slidably connected inside the sliding groove 101. A connecting rod 322 is rotatably connected inside the movable block 321. Fixed blocks 323 are rotatably connected to both the left and right sides of the connecting rod 322.

[0095] The fixed block 323 is rotatably connected to the side wall of one of the arc-shaped plates 221 on the side away from the connecting rod 322. During the movement of the moving block 321, it will be guided by the inclined surface at the bottom of the sliding groove 101 to move obliquely downward. Then, when the arc-shaped plate 221 is rotated and reset by the reset force of the second elastic element 224, the arc-shaped plate 221 will push the moving block 321 to reset and slide in the sliding groove 101 through the connecting rod 322.

[0096] In use, the staff places the testing device at the inlet of the unopened turbine. Then, the staff starts the testing vehicle 1 and makes it movable. When the testing vehicle 1 moves, it enters the turbine through the turbine inlet. After the testing vehicle 1 enters the turbine and travels to the blade surface, the adsorption pump 102 inside the testing vehicle 1 is started. When several adsorption pumps 102 are working, they will alternately suck air through the suction cups 103 at the bottom, allowing the testing vehicle 1 to move and travel on the blade surface through the suction cups 103.

[0097] When the inspection vehicle 1 moves along the blade, the detector 111 inside it scans the outer surface of the blade located at the bottom of the inspection vehicle 1. The data collected by the detector 111 after scanning is transmitted to the workbench located outside the turbine through the transmission head 112. The workbench then compares the collected data with a sample of a blade in normal condition inside to determine whether there are defects on the surface of the blade being inspected by the inspection vehicle 1, thus completing the blade inspection process.

[0098] As the inspection vehicle 1 moves on the surface of the blade, it will drive the fixed plate 121 and the connecting plate 122 located inside it to move. When the connecting plate 122 moves, it will drive the connecting strip 211 connected to it to move. When the connecting strip 211 moves, it will push several arc plates 221 to move through the side wall. Since the bottom of the several arc plates 221 is in contact with the outer surface of the blade, when the several arc plates 221 move, their bottoms will scrape off the oil and other impurities attached to the outer surface of the blade.

[0099] Because the blade is curved, when the inspection vehicle 1 moves on the blade, several arc-shaped plates 221 will rise to different degrees due to the push of the curved surface of the blade. When the arc-shaped plates 221 rise, they will exert a thrust on the first elastic element 223 located inside the arc-shaped groove 222, causing the first elastic element 223 to contract and accumulate potential energy. When the first elastic element 223 contracts, it will apply a partial force to push the sliding block 212 to push the connecting strip 211 to rotate slightly upward around the connecting plate 122. At the same time, due to the different degrees of rising of the multiple arc-shaped plates 221, the arc-shaped plates 221 will tilt at the curved surface of the blade with the sliding block 212 as the center.

[0100] At this point, multiple curved plates 221 can be attached to the surface of the blade at the curved surface in an inclined manner, presenting a shape like... Figure 12 As shown in the diagram, this allows for the scraping of oil and other impurities from the blade surface during subsequent movement. This reduces the likelihood of oil and other impurities adhering to the outer surface of the blades after a period of operation, which could cause the device to become unstable or slip due to the influence of oil and other impurities during movement. Consequently, this ensures the stability of the device during movement and improves the overall quality and efficiency of the device in detecting damage to the blade surface.

[0101] When the device moves to the side wall of the blade connection end, the arc-shaped plate 221 will contact the blade connection end and apply a thrust to it as the inspection vehicle 1 continues to move. When the arc-shaped plate 221 applies a thrust to the blade connection end, it will receive a counter-thrust from the blade connection end. When the arc-shaped plate 221 receives the counter-thrust from the blade connection end, the arc-shaped plate 221 will rotate downward around the connecting plate 122 via the sliding block 212 and the connecting strip 211. During the downward rotation of the arc-shaped plate 221, the area of ​​the inspection vehicle 1 near the arc-shaped plate 221 will tilt upward.

[0102] At the same time, the rotation of the arc plate 221 will push the arc rod 311 on its inner wall to move in a ring around the connecting block 313. When the arc rod 311 moves, its top will contact the side wall of the arc plate 221 and apply a thrust to the side wall of the arc plate 221, thereby strengthening the force of the arc plate 221 to tilt the detection vehicle 1.

[0103] Because the rear wheels of the inspection vehicle 1 continue to push it to move when it tilts, thus allowing it to climb to the blade connection end, the entire climbing process of the inspection vehicle 1 is completed after it moves to the blade connection end. This reduces the situation where the bottom of the arc plate 221 gets stuck between the blade connection end and the blade connection end when the inspection vehicle 1 needs to move to another blade after completing the inspection of one blade. This facilitates the movement of the inspection vehicle 1 inside the turbine and improves the continuity of the blade inspection process as well as the inspection efficiency of the subsequent blade surface inspection.

[0104] When the arc-shaped plate 221 contacts the blade connection end during movement and rotates downward around the connecting plate 122 via the connecting strip 211, the rotation of the arc-shaped plate 221 will apply a thrust to the second elastic element 224. Since one end of the second elastic element 224 is fixed to the bottom of the connecting plate 122, when the second elastic element 224 is subjected to the thrust, the second elastic element 224 will contract and accumulate potential energy.

[0105] Meanwhile, when the second elastic element 224 contracts, it applies an upward pushing force to the already raised inspection vehicle 1 as it continues to move. This assists the inspection vehicle 1 in its climbing motion toward the blade connection point, reducing the risk of the inspection vehicle 1 shifting due to the large reaction force at the blade connection point when the arc plate 221 rotates after contacting the blade connection point under the push of the inspection vehicle 1. This also reduces the impact force on the inspection vehicle 1 during its climbing motion, further improving the overall quality of the device in detecting damage to the blade surface.

[0106] When the arc-shaped plate 221 rotates downward, its sidewall will move by pulling the connecting rod 322 through the fixed block 323. When the connecting rod 322 moves, it will pull the moving block 321 to slide in the sliding groove 101 towards the arc-shaped plate 221. During the movement of the moving block 321, it will be guided by the inclined surface at the bottom of the sliding groove 101 to move obliquely downward. Then, when the arc-shaped plate 221 is reset by the reset force of the second elastic element 224, the arc-shaped plate 221 will push the moving block 321 to reset and slide in the sliding groove 101 through the connecting rod 322.

[0107] Since the moving block 321 is located at the bottom of the sliding groove 101, when the moving block 321 resets and slides, its bottom will exert a pushing force on the bottom of the sliding groove 101. When the bottom of the sliding groove 101 is pushed, 1 will tilt up, causing 122 to drive 221 to move slightly upward, thereby reducing the contact area between the bottom of 211 and the blade connection end. Afterwards, when the two arc plates 221 reset, the connecting strip 211 and the sliding block 212 will pull the remaining arc plates 221 to reset. This reduces the situation where the detection vehicle 1 bounces back due to the reset force of the arc plate 221 caused by the second elastic element 224 when the arc plate 221 resets after the detection vehicle 1 climbs to the blade connection end. This further improves the overall efficiency of the device when detecting the blade surface.

[0108] It should be noted that the device housing of this application uses a miniature mobile device to enable it to move on the blade, while the internal detector housing uses a small infrared scanning detection device to enable stable and effective detection.

[0109] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A non-destructive testing device for surface defects of steam turbine blades, characterized in that, include: The inspection vehicle is equipped with an adsorption-walking unit for moving on the blade surface, and an inspection assembly for detecting defects on the blade surface. It also includes: A cleaning and adaptive bonding mechanism is rotatably mounted on the inspection vehicle. The cleaning and adaptive bonding mechanism includes a scraper unit capable of bonding to the surface of the blade, and an elastic connector connecting the scraper unit and the inspection vehicle. When the inspection vehicle moves on the blade surface, the scraper unit is configured to adhere to the blade surface under the elastic action of the elastic connector and scrape off the oil and impurities on the blade surface. The cleaning and adaptive bonding mechanism includes a fixed plate fixedly connected to the testing vehicle, and a connecting plate connected to the fixed plate; The scraper unit includes a connecting strip rotatably connected to the connecting plate, and an arc-shaped plate connected to the connecting strip; The elastic connector includes a first elastic element disposed between the arc-shaped plate and the connecting strip, and a second elastic element connected between the arc-shaped plate and the connecting plate; It also includes an obstacle-crossing assistance mechanism, which includes: A rotating assembly is rotatably connected to the scraper unit; The swing assembly is slidably connected to the sliding groove on the top of the inspection vehicle and rotatably connected to the scraper unit; The rotating component includes: An arc-shaped rod is rotatably connected to the scraper unit, and a moving groove is provided on the side wall of the arc-shaped rod; A connecting block is connected to the side wall of the connecting plate, and the connecting block is slidably connected within the moving groove; When the scraper unit is subjected to force and rotates downward, it drives the arc-shaped rod to move, so that the top of the arc-shaped rod abuts against and pushes the scraper unit, and assists its rotation; The bottom of the sliding groove is provided with an inclined surface, wherein when the moving block slides in the sliding groove, its movement trajectory is guided by the inclined surface.

2. The non-destructive testing equipment for surface defects of steam turbine blades according to claim 1, characterized in that, The inner wall of the arc-shaped plate is provided with an arc-shaped groove, and the first elastic element is disposed in the arc-shaped groove; A sliding block is provided on the connecting strip at the position corresponding to the arc plate. One end of the first elastic element is connected to the inner wall of the arc groove, and the other end is connected to the sliding block.

3. The non-destructive testing equipment for surface defects of steam turbine blades according to claim 2, characterized in that, One end of the second elastic element is connected to the inner wall of the arc-shaped plate, and the other end is connected to the connecting plate.

4. The non-destructive testing equipment for surface defects of steam turbine blades according to claim 1, characterized in that, The swing component includes: The movable block is slidably connected within the sliding groove; The connecting rod is rotatably connected to the movable block; The fixed block is rotatably connected at one end to the connecting rod and at the other end to the scraper unit; When the scraper unit rotates, the moving block is driven to slide in the sliding groove through the fixed block and the connecting rod.

5. The non-destructive testing equipment for surface defects of steam turbine blades according to claim 1, characterized in that, The adsorption walking unit includes an adsorption pump disposed on the testing vehicle and a suction cup connected to the adsorption pump. The adsorption pump drives the testing vehicle to move by controlling the suction cup to perform alternating adsorption.

6. The non-destructive testing equipment for surface defects of steam turbine blades according to claim 1, characterized in that, The detection component includes a detector installed inside the detection vehicle and a transmission head for transmitting detection data.

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