Ultrasonic nondestructive testing device for steam turbine blade after casting

Abstract

This disclosure provides an ultrasonic non-destructive testing device for turbine blades after casting and machining, comprising: a fixing mechanism for attaching to the surface of the target to be tested; a testing mechanism connected to and driven by the fixing mechanism, the testing mechanism being used to emit ultrasonic waves to the blade; the testing mechanism including two testing units that can be relatively unfolded and closed, each testing unit including a first testing plate and a second testing plate, the second testing plate being rotatably connected to the first testing plate via a rotating shaft, the second testing plate being provided with an ultrasonic transmitter; a width adaptive mechanism connected between the two first testing plates, used to change the horizontal distance between the two first testing plates as the first testing plates rotate with the width of the blade surface, so that the two testing units adapt to the width change of the blade surface; and an anti-interference mechanism, used to drive the second testing plate to tilt around the rotating shaft to overcome the obstacle when the second testing plate moves along the blade surface and encounters an obstacle.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of ultrasonic non-destructive testing equipment, specifically relating to an ultrasonic non-destructive testing device for turbine blades after casting and processing. Background Technology

[0002] When turbine blades need to be inspected, a mobile robotic arm carries a wall-climbing robot into the turbine through the air inlet. The mobile robot uses an autonomous navigation algorithm, enabling it to self-locate and navigate in complex environments, accurately reaching the target inspection area. Upon arrival, the wall-climbing robot automatically begins its inspection work, performing comprehensive damage detection.

[0003] When the robot is inspecting the surface of a blade for defects, the inspection device moves on the blade. As the blade gets closer to the edge, its width increases and its tilt angle changes. This causes the ultrasonic detector on the robot to have an excessively large blind spot during the inspection process, affecting the accuracy of the inspection.

[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 an ultrasonic non-destructive testing device for turbine blades after casting and processing.

[0006] One aspect of the embodiments of this disclosure provides an ultrasonic non-destructive testing device for turbine blades after casting and processing, comprising: A fixing mechanism for attaching to the surface of the target object; The detection mechanism is connected to and driven by the fixed mechanism. The detection mechanism is used to emit ultrasonic waves to the blade. The detection mechanism includes two detection units that can be unfolded and closed relative to each other. Each detection unit includes a detection plate one and a detection plate two. The detection plate two is rotatably connected to the detection plate one via a rotating shaft. An ultrasonic transmitter is provided on the detection plate two. A width adaptive mechanism is connected between the two detection plates and is used to change the horizontal distance between the two detection plates as the detection plates rotate with the change of blade surface width, so that the two detection units adapt to the change of blade surface width. An anti-interference mechanism is used to drive the second detection plate to tilt around the rotation axis when the second detection plate moves along the surface of the blade and encounters an obstacle, so as to overcome the obstacle.

[0007] Optionally, the width adaptive mechanism includes: The fixing strip is fixedly connected to both sides of the base of the testing mechanism; The telescopic strip is slidably connected within the fixed strip; A connecting component is used to drively connect the telescopic strip to the corresponding detection plate; When the two detection units are squeezed together by the blades, the telescopic strip extends from the fixed strip through the connecting assembly, thereby increasing the horizontal distance between the two detection plates.

[0008] Optionally, the width adaptive mechanism further includes a reset elastic element connected between the telescopic bar and the fixed bar, wherein the reset elastic element is configured to accumulate or release the potential energy of the detection unit when it closes and expands.

[0009] Optionally, the anti-interference mechanism includes: A sliding column is fixedly connected to the end of the rotating shaft; A sliding groove is connected to the telescopic strip, wherein the sliding column is slidably disposed within the sliding groove; A trigger element is disposed in the slide groove; A rotation trigger assembly is disposed on the sliding column, and is used to contact the trigger when the sliding column slides to the trigger position, so as to rotate the sliding column and the rotating shaft, thereby driving the detection plate II to tilt.

[0010] Optionally, the trigger element includes a trapezoidal plate, and the rotation trigger assembly includes: The locking block is rotatably connected to the sliding column; The second locking block is fixed to the sliding column and is used to restrict the rotation direction of the locking block; When the sliding column slides and the locking block contacts the inclined surface of the trapezoidal plate, the locking block is pushed and the sliding column rotates due to the limiting position of the second locking block.

[0011] Optionally, it may also include a damage prevention mechanism, the damage prevention mechanism comprising: An elastic plate, one end of which is fixed to the sliding column; A roller is rotatably connected to the other end of the elastic plate and abuts against the inner wall of the groove; The elastic plate and the roller are used to transmit rotational force to the inner wall of the groove when the sliding column has an unexpected rotational tendency, so as to limit the rotation of the sliding column through the reaction force.

[0012] Optionally, the detection plate 2 is rotatably provided with a rubber wheel for rolling contact with the blade surface.

[0013] Optionally, the fixing mechanism includes: Box; Two adsorption tracks are rotatably connected to opposite sides of the housing and are used to adsorb onto the blade or adjacent structural surface and move. A robotic arm is rotatably connected to the housing, and its end is connected to the base of the detection mechanism, used to drive the detection mechanism to reach and scan the position to be detected on the blade.

[0014] Optionally, the two detection units are symmetrically arranged in the detection mechanism.

[0015] Optionally, two triggers are arranged at relatively intervals along the length of the slide.

[0016] The beneficial effects of the embodiments of this disclosure include: (1) When the two detection plates 2 slide on the detection blade, the blades on both sides will become narrower and narrower. This will cause the rubber wheel on the detection plate 2 to be subjected to pressure from the blade restriction, causing the detection plates on both sides to rotate in the direction of the blade. This will increase the horizontal distance between the detection plate 1 and the detection plate 2. At this time, the telescopic strip and the sliding groove inside the fixing strip will move away from the fixing strip. As the detection plate 1 moves closer to the blade, the telescopic strip and the sliding groove will also move continuously. By detecting the blade in this way, the surface of the blade becomes flatter as it gets closer to the edge. At this time, the detection plate 2 and the detection plate 1 will also become flatter, so that the ultrasonic waves emitted by the detection plate 2 and the detection plate 1 can expand the coverage area of ​​the ultrasonic waves. This prevents the detection device from being unable to adjust in time due to the continuous change of the blade surface shape, so that some areas on the blade cannot be detected.

[0017] (2) When the detection plate 1 and the detection plate 2 move closer to the blade, the trapezoidal plate will exert a pushing force on the detection plate when the block contacts the trapezoidal plate. Because the second detection plate will restrict the block from rotating, when the sliding column rotates, the rotation axis and the second detection plate will tilt slightly around the rotation axis. At the same time, the elastic plate will be bent and accumulate elastic potential energy. In this way, the second detection plate will tilt slightly, so that when the second detection plate passes the reinforcing rib between the blades, the ultrasonic waves emitted by the second detection plate can detect the defects on the surface of the reinforcing rib, preventing the failure to detect the defects of the reinforcing rib between the blades when the second detection plate moves for detection.

[0018] (3) When the rubber wheel is subjected to pressure from the blade, the sliding column will slide along the inner wall of the groove. Because the tilt angle of the blade is not uniform, when the rubber wheel is squeezed by the blade surface, as the detection plate 2 moves towards the blade, a rotational force with the rotation axis as the center of rotation will appear. At this time, the sliding column will show a rotational tendency. This will cause the rotational force generated on the sliding column to act on the elastic plate. At this time, the elastic plate will transmit the force to the groove. When it is transmitted to the groove, the reaction force generated by the groove will offset the rotational force on the sliding column, so that the detection plate 2 is in a relatively straight state, effectively preventing the detection plate 2 from rotating towards the blade, causing the outer wall of the detection plate 2 to rub and slide against the blade surface, resulting in damage to the blade surface.

[0019] (4) When the card block moves toward the detection blade, it will come into contact with the trapezoidal plate. The trapezoidal plate will generate a thrust on the card block, as shown in the figure. Because the second card block will restrict the counterclockwise rotation of the card block, the thrust of the card block will force the sliding column to rotate. At the same time, the rotating shaft and the second detection plate will rotate slightly away from the detection blade with the rotating shaft as the rotation center. In this way, the second detection plate will be prevented from being stuck by the reinforcing ribs between the blades when it moves on the blade, which would prevent the detection from being carried out normally. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an ultrasonic non-destructive testing device for turbine blades after casting and processing, according to an embodiment of the present disclosure. Figure 2 This is a schematic diagram of the structure of a testing mechanism according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of a testing mechanism according to another embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of a testing mechanism according to another embodiment of this disclosure; Figure 5 for Figure 4 Enlarged structural diagram of region A in the middle; Figure 6 This is a schematic diagram of the structure of a testing mechanism according to another embodiment of the present disclosure; Figure 7 for Figure 6 Enlarged structural diagram of region B in the middle; Figure 8 This is a schematic diagram of the structure of a testing mechanism according to an embodiment of the present disclosure.

[0021] In the diagram, 1 is the fixing mechanism; 12 is the adsorption track; 13 is the housing; and 14 is the robotic arm. 2. Testing mechanism; 211. Testing plate one; 212. Junction box; 221. Rotating shaft; 222. Testing plate two; 223. Rubber wheel; 311. Fixing strip; 312. Telescopic strip; 321. Slide groove; 322. Reset elastic element; 411. Trapezoidal plate; 412. Sliding column; 413. Second locking block; 421. Elastic plate; 422. Roller; 423. Locking block. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] like Figure 1-8 As shown, an ultrasonic non-destructive testing device for turbine blades after casting includes a fixing mechanism 1, a testing mechanism 2, a width adaptive mechanism, and an anti-interference mechanism. The fixing mechanism 1 is used to attach to the surface of the target being tested.

[0026] The detection mechanism 2 is connected to and driven by the fixing mechanism 1. The detection mechanism is used to emit ultrasonic waves to the blade. The detection mechanism 2 includes two detection units that can be unfolded and closed relative to each other. Each detection unit includes a first detection plate 211 and a second detection plate 222. The second detection plate 222 is rotatably connected to the first detection plate 211 via a rotating shaft 221. An ultrasonic transmitter is provided on the second detection plate 222.

[0027] A width adaptive mechanism is connected between the two detection plates 211 and is used to change the horizontal distance between the two detection plates 211 when the detection plates 211 rotate with the change of blade surface width, so that the two detection units adapt to the width change of the blade surface.

[0028] The anti-interference mechanism is used to drive the second detection plate 222 to tilt around the rotation axis 221 when the second detection plate 222 moves along the blade surface and encounters an obstacle, so as to overcome the obstacle.

[0029] In this application, the device effectively solves two key problems in ultrasonic testing of turbine blades through the coordinated operation of an expandable / closeable detection mechanism, a width adaptive mechanism, and an anti-interference mechanism: First, it can automatically adapt to changes in the blade surface width, expand the ultrasonic coverage area, and eliminate detection blind spots; Second, it can automatically tilt the probe briefly when encountering obstacles such as reinforcing ribs, achieving continuous and non-destructive testing, thereby improving the comprehensiveness, accuracy, and automation level of the testing.

[0030] In some embodiments, the width-adaptive mechanism includes a fixed strip 311, a telescopic strip 312, and a connecting component.

[0031] The fixing strip 311 is fixedly connected to both sides of the base of the detection mechanism, and the telescopic strip 312 is slidably connected inside the fixing strip 311.

[0032] The connecting component is used to drive the telescopic bar 312 to the corresponding detection plate 211.

[0033] When the two detection units are squeezed together by the blades, the telescopic strip 312 extends from the fixed strip 311 via the connecting assembly, thereby increasing the horizontal distance between the two detection plates 211. The base includes a junction box 212, and the connecting assembly includes a slide groove 321, a sliding column 412, and a rotating shaft 221.

[0034] In this application, the width adaptive mechanism, through the connecting components of a fixed bar, a telescopic bar, a slide groove, a sliding column, and a rotating shaft, enables the detection plate to automatically drive the telescopic bar to extend when it is pressed and closed, thereby increasing the distance between the two detection units. This allows the ultrasonic probe to remain in close contact with the blade at the widened part, effectively eliminating the detection blind spot caused by the change in blade cross-section and ensuring comprehensive coverage detection of complex curved blades.

[0035] In some embodiments, the width adaptive mechanism further includes a reset elastic element 322 connected between the telescopic bar 312 and the fixed bar 311, wherein the reset elastic element is configured to store or release the potential energy of the detection unit when it closes and expands. In some embodiments, the reset elastic element 322 is a spring.

[0036] In this application, the reset elastic element can accumulate elastic potential energy when the detection unit closes, and release this energy after the detection is completed, automatically driving the telescopic bar and the detection unit to reset to the initial unfolded posture, ensuring that the detection action of the device is automatic, smooth and efficient cycle.

[0037] In some embodiments, the anti-interference mechanism includes a sliding column 412, a sliding groove 321, a trigger element, and a rotation trigger assembly.

[0038] The sliding column 412 is fixedly connected to the end of the rotating shaft 221, and the sliding groove 321 is connected to the telescopic bar 312, wherein the sliding column 412 is slidably disposed in the sliding groove 321.

[0039] A trigger element is disposed in the slide groove 321, and a rotation trigger assembly is disposed in the sliding column 412. When the sliding column 412 slides to the trigger element position, it contacts the trigger element, causing the sliding column 412 and the rotating shaft 221 to rotate, thereby tilting the detection plate 222. The rotation trigger assembly includes a locking block 423 and a locking block 413.

[0040] In this application, the anti-interference mechanism, through the cooperation of a sliding column, a sliding groove, a trapezoidal plate, a locking block, and a second locking block, enables the detection device to automatically trigger the second detection plate to tilt upward briefly when it moves along the blade and encounters obstacles such as reinforcing ribs, thus smoothly overcoming the obstacles. This design effectively solves the problem of the probe getting stuck when moving between blades, achieving uninterrupted and continuous detection of the entire surface of the blade, including the reinforcing rib area.

[0041] In some embodiments, the trigger includes a trapezoidal plate 411, and the rotation trigger assembly includes a locking block 423 and a second locking block 413.

[0042] The locking block 423 is rotatably connected to the sliding column 412, and the locking block 413 is fixed to the sliding column 412 to limit the rotation direction of the locking block 423.

[0043] When the sliding column 412 slides and the locking block 423 contacts the inclined surface of the trapezoidal plate 411, the locking block 423 is pushed and the sliding column 412 rotates due to the limiting position of the locking block 413.

[0044] In this application, the triggering and rotation mechanism works in conjunction with the inclined surface of the trapezoidal plate, the rotatable locking block, and the second locking block that acts as a limiter. When the sliding column moves to a specific position, the linear contact force is converted into a precise and controllable rotational torque, thereby driving the sliding column and the second detection plate to quickly and accurately achieve a brief tilt to avoid obstacles on the blade, ensuring the uninterrupted and continuous detection process.

[0045] In some embodiments, a damage prevention mechanism is also included, which includes an elastic plate 421 and a roller 422.

[0046] One end of the elastic plate 421 is fixed to the sliding column 412, and the roller 422 is rotatably connected to the other end of the elastic plate 421 and abuts against the inner wall of the groove 321.

[0047] The elastic plate 421 and the roller 422 are used to transmit rotational force to the inner wall of the groove 321 when the sliding column 412 has an unexpected rotational tendency, so as to limit the rotation of the sliding column 412 through the reaction force.

[0048] In this application, the anti-damage mechanism, through the setting of rollers between the elastic plate and the inner wall of the slide groove, can immediately transmit the rotational force and convert it into positive pressure on the slide groove wall when the sliding column has an unexpected rotational tendency due to irregular force on the blade surface. In this way, the reaction force can be used to effectively limit the random rotation of the sliding column, ensuring that the detection plate 2 always maintains a stable posture on the blade surface, avoiding sliding friction between it and the blade, and thus preventing scratches on the delicate blade surface.

[0049] In some embodiments, the detection plate 222 is rotatably provided with a rubber wheel 223 for rolling contact with the blade surface.

[0050] In this application, the rubber wheel enables rolling contact between the detection plate and the blade, reducing friction and protecting the blade surface.

[0051] In some embodiments, the fixing mechanism 1 includes a housing 13, two suction tracks 12, and a robotic arm 14.

[0052] Two adsorption tracks 12 are rotatably connected to opposite sides of the housing 13 for adsorption onto the blade or adjacent structural surface. A robotic arm 14 is rotatably connected to the housing 13, with its end connected to the base of the detection mechanism 2, for driving the detection mechanism 2 to reach and scan the position to be detected on the blade.

[0053] In this application, the fixing mechanism uses an adsorption track mounted on a box to achieve stable adsorption and movement of the device on complex curved surfaces (such as blades), and the robotic arm precisely drives and positions the detection mechanism, enabling the ultrasonic probe to flexibly and stably perform non-destructive testing on various parts of the blade.

[0054] In some embodiments, two of the detection units are symmetrically arranged on the detection mechanism 2.

[0055] In this application, the symmetrically arranged detection units can scan both the upper and lower surfaces of the blade simultaneously, thereby significantly improving the efficiency and coverage of a single detection.

[0056] In some embodiments, two triggers are arranged at relatively intervals along the length of the slide 321.

[0057] In this application, two triggers symmetrically arranged along the slide groove enable the detection device to reliably trigger obstacle avoidance actions in both forward and backward movement directions, thereby ensuring the bidirectional continuity and integrity of the detection process.

[0058] For details, please refer to Figure 1 - Figure 3 This application is an ultrasonic non-destructive testing device for turbine blades after casting and processing. It includes a fixing mechanism 1, and the fixing mechanism 1 also includes a housing 13. Two adsorption tracks 12 are rotatably connected to the outer wall of the housing 13, and a robotic arm 14 is rotatably connected to the outer wall of the housing 13.

[0059] The inspection mechanism 2 is fixedly connected to the outer wall of the robotic arm 14 and is used to inspect defects on the blades. Specifically, when the housing 13 reaches the designated position, the inspection mechanism 2 inspects the blades by extending the robotic arm 14.

[0060] refer to Figures 4-8 The detection mechanism 2 includes a junction box 212 rotatably connected to the outer wall of the robotic arm 14, and two detection plates 211 rotatably connected to the outer wall of the junction box 212. It also includes two rotating shafts 221 rotatably connected to the outer walls of the two detection plates 211, and two detection plates 222 fixedly connected to the outer walls of the two rotating shafts 221. Several rubber wheels 223 are rotatably connected to the outer walls of the two detection plates 222.

[0061] In the initial state, the detection plate 222 is horizontal and the two detection plates 222 are mirror symmetrical. The number of rubber wheels 223 on the outer wall of the two detection plates 222 is the same and they are symmetrical. The rubber wheels 223 are made of rubber.

[0062] As the upper and lower detection plates 222 slide on the detection blades, the blades on both sides will continuously narrow, causing the rubber wheel 223 on the detection plate 222 to be subjected to pressure from the blades. This causes the detection plates 211 on both sides to begin rotating on the junction box 212 towards the direction of the detection blades, increasing the horizontal distance between the detection plates 211 and the rubber wheel 223.

[0063] At this time, the telescopic strip 312 and the slide groove 321 inside the fixed strip 311 will move away from the fixed strip 311. As the detection plate 211 moves closer to the blade, the telescopic strip 312 and the slide groove 321 will also move continuously. In this way, when detecting the blade, because the blade surface becomes flatter as it gets closer to the edge, the detection plate 222 and the detection plate 211 will also become flatter, so that the ultrasonic waves emitted by the detection plate 222 and the detection plate 211 can cover the entire surface of the blade, preventing the detection device from failing to adjust in time due to the continuous changes in the shape of the blade surface, thus preventing certain areas on the blade from being undetectable.

[0064] The detection device also includes two fixing strips 311 fixedly connected to both sides of the junction box 212, and two telescopic strips 312 slidably connected to the inner walls of the two fixing strips 311.

[0065] The fixing strip 311 and the telescopic strip 312 are located on both sides of the junction box 212 and are in a mirror-symmetrical state.

[0066] The detection device also includes two sliding grooves 321 fixedly connected to the outer walls of the two telescopic bars 312. A reset elastic element 322 is fixedly connected to the side wall of the telescopic bar 312, with one end of the reset elastic element 322 away from the telescopic bar 312 fixedly connected to the inner wall of the fixed bar 311. When the rubber wheel 223 is subjected to pressure from the blade, as the sliding column 412 on the outer wall of the rotating shaft 221 slides along the inner wall of the sliding groove 321, because the blade surface is irregular, when the rubber wheel 223 is squeezed by the blade, the detection plate 222 will experience a rotational force centered on the rotating shaft 221 as it moves towards the blade.

[0067] At this point, the sliding column 412 will tend to rotate, causing the rotational force generated on the sliding column 412 to act on the elastic plate 421. The elastic plate 421 will then transmit the force to the slide groove 321. When the force is transmitted to the slide groove 321, the reaction force generated by the slide groove 321 will counteract the rotational force on the sliding column 412, causing the detection plate 222 to be in a relatively straight position and move towards the blade, preventing the detection plate 222 from rotating towards the blade and causing damage to the blade surface.

[0068] The detection device also includes two sliding columns 412 fixedly connected to the outer walls of the two rotating shafts 221, two trapezoidal plates 411 fixedly connected to the outer walls of the two sliding grooves 321, and a locking block 413 fixedly connected to the outer wall of each sliding column 412.

[0069] Each rotating shaft 221 has two sliding columns 412 fixed on both sides, and each groove 321 has two trapezoidal plates 411 connected to its outer wall, with the two trapezoidal plates 411 being mirror symmetrical.

[0070] The detection device also includes two elastic plates 421 fixedly connected to the outer wall of each sliding column 412, a roller 422 rotatably connected to the inner wall of each elastic plate 421, and a locking block 423 rotatably connected to the outer wall of each sliding column 412.

[0071] When the locking block 423 moves toward the detection blade, it comes into contact with the trapezoidal plate 411. The trapezoidal plate 411 will generate a pushing force on the locking block 423. Because the second locking block 413 on the surface of the sliding column 412 will restrict the locking block 423 from rotating, the sliding column 412 will rotate. At the same time, the rotating shaft 221 and the second detection plate 222 will rotate slightly away from the detection blade with the rotating shaft 221 as the rotation center. In this way, the second detection plate 222 will be prevented from being stuck by the protrusions between the blades when it moves on the blade, which would prevent the detection from being carried out normally.

[0072] In a specific example of this embodiment: Before starting the inspection, the operator places the inspection device on a larger mobile robot, starts the robot, and sends the inspection device into the inlet of the steam turbine. When it reaches the inspection area, the computer controls the housing 13 to start, and the suction track 12 keeps the housing 13 at the center of the impeller.

[0073] When the device stops moving, the extension of the robotic arm 14 moves the junction box 212 to the edge of the blade, positioning one of the blades between the two detection plates 222, and initiating detection. At the start of detection, the extension of the robotic arm 14 slowly moves the two detection plates 222 from a position near the center of the blade towards the blade edge. Initially, because the distance between the upper and lower blades is relatively wide, the outer walls of the two detection plates 222 cannot touch the blades. As the distance between adjacent blades narrows closer to the edge, the rubber wheels 223 on the outer walls of the two detection plates 222 will contact the blades. This will subject the rubber wheels 223 to the restrictive pressure from the blades, causing the two detection plates 222 and the detection plate 221 to move closer to the central blade.

[0074] At this time, as the two detection plates 222 move closer to the center, the two rotating shafts 221 also begin to move closer to the center blade. As the rotating shafts 221 move, the sliding column 412 also begins to slide inside the groove of the slide 321, following the direction of the rotating shafts 221's movement.

[0075] Simultaneously, roller 422 will also begin to slide along the inner wall of groove 321. As sliding column 412 slides along groove 321, it tends to rotate. At this time, the force of rotation of sliding column 412 is relatively small, and the rotational force is transmitted to elastic plate 421. Elastic plate 421 then transmits the force to groove 321. The reaction force generated by groove 321 counteracts the force transmitted by elastic plate 421, preventing sliding column 412 from rotating independently while sliding on groove 321.

[0076] When the detection plate 222 is near the reinforcing rib between the two blades, the locking block 423 will contact the inclined surface of the trapezoidal plate 411. At this time, the locking block 423 will be subjected to the squeezing force of the trapezoidal plate 411, which will cause the sliding column 412 to rotate. The rotating sliding column 412 will cause the elastic plate 421 to bend. At this time, the rotating shaft 221 and the detection plate 222 will also tilt slightly away from the blade being detected, with the rotating shaft 221 as the center of rotation, so that the detection plate 222 can pass over the reinforcing rib in the middle.

[0077] As the sliding column 412 slides down, the locking block 423 will reach the other end of the trapezoidal plate 411. At this time, the deformed elastic plate 421 will release elastic potential energy, causing the sliding column 412 to rotate in the opposite direction again, so that the rotating shaft 221 and the detection plate 222 will once again take the rotating shaft 221 as the center of rotation, so that the detection plate 222 will return to the horizontal state.

[0078] As the second detection plate 222 moves closer to the edge of the blade, the distance between the blades gradually narrows. As the rotating shaft 221 and the second detection plate 222 move closer to the detection blade, the first detection plate 211 slowly changes from its original tilted state to a horizontal state, thus increasing the horizontal distance between the second detection plate 222 and the first detection plate 211.

[0079] When the horizontal distance between the two detection plates 222 increases, the reset elastic element 322 will be stretched and deformed, accumulating potential energy. At this time, the telescopic bar 312 and the slide groove 321 will move horizontally away from the fixed bar 311. When the detection is completed, by controlling the robotic arm 14 to move the two detection plates 222 away from the blades, since the blades on the upper and lower sides will no longer exert pressure on the outer walls of the two detection plates 222, the reset elastic element 322 inside the telescopic bar 312 will release elastic potential energy, moving the telescopic bar 312 and the slide groove 321 horizontally towards the junction box 212.

[0080] At this point, the detection plate 211 will gradually return to its tilted state, and the four sliding posts 412 will begin to move closer to the two ends of the sliding grooves 321. When the locking block 423 contacts the trapezoidal plate 411, it will rotate around the sliding post 412, compressing the torsion spring inside the sliding post 412 and accumulating potential energy. When the locking block 423 reaches the other end of the trapezoidal plate 411, the locking block 423 will recover to the same horizontal state as the detection plate 222 through the potential energy of the torsion spring inside the sliding post 412.

[0081] As the two detection plates 222 slide on the detection blades, the blades on both sides continuously narrow, causing the rubber wheels 223 on the detection plates 222 to be subjected to pressure from the blades. This causes the detection plates 211 on both sides to begin rotating towards the blades, thereby increasing the horizontal distance between the detection plates 211 and 222. At this time, the telescopic strip 312 and the sliding groove 321 inside the fixing strip 311 will move away from the fixing strip 311.

[0082] As the detection plate 211 moves closer to the blade, the telescopic strip 312 and the sliding groove 321 also move continuously. This method of blade detection works because the blade surface becomes flatter as it approaches the edge. Consequently, the detection plates 222 and 211 also become flatter, increasing the coverage area of ​​the ultrasonic waves emitted by them. This prevents the detection device from failing to adjust in time due to the changing shape of the blade surface, thus ensuring that certain areas on the blade are not detected.

[0083] As detection plates 211 and 222 move closer to the blade, when the locking block 423 contacts the trapezoidal plate 411, the trapezoidal plate 411 exerts a pushing force on the locking block 423. Because the locking block 413 restricts the rotation of the locking block 423, when the sliding column 412 rotates, the rotation axis 221 and the detection plate 222 will tilt slightly around the rotation axis 221 as the center of rotation. At the same time, the elastic plate 421 will also be bent and accumulate elastic potential energy. In this way, the detection plate 222 will tilt slightly, so that when the detection plate 222 passes over the reinforcing ribs between the blades, the ultrasonic waves emitted by the detection plate 222 can detect defects on the surface of the reinforcing ribs, preventing defects in the reinforcing ribs between the blades from going undetected during the movement and detection of the detection plate 222.

[0084] When the rubber wheel 223 is subjected to pressure from the blade, the sliding column 412 slides along the inner wall of the groove 321. Because the inclination angle of the blades is not uniform, when the rubber wheel 223 is squeezed by the blade surface, as the detection plate 222 moves towards the blade, a rotational force will appear with the rotation axis 221 as the center of rotation. At this time, the sliding column 412 will tend to rotate, and the rotational force generated on the sliding column 412 will act on the elastic plate 421. At this time, the elastic plate 421 will transmit the force to the groove 321. When it is transmitted to the groove 321, the reaction force generated by the groove 321 will counteract the rotational force on the sliding column 412, so that the detection plate 222 is in a relatively straight state, effectively preventing the detection plate 222 from rotating towards the blade, causing friction and sliding between the outer wall of the detection plate 222 and the blade surface, resulting in damage to the blade surface.

[0085] As the locking block 423 moves towards the detection blade, it comes into contact with the trapezoidal plate 411, which in turn generates a pushing force on the locking block 423. Figure 7 As shown, because the second locking block 413 restricts the counterclockwise rotation of the locking block 423, the thrust of the locking block 423 forces the sliding column 412 to rotate. At the same time, the rotating shaft 221 and the second detection plate 222 will rotate slightly away from the detection blade with the rotating shaft 221 as the center of rotation. In this way, the second detection plate 222 is prevented from being stuck by the reinforcing ribs between the blades when it moves on the blade, which would prevent the detection from proceeding normally.

[0086] 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. An ultrasonic non-destructive testing device for turbine blades after casting and processing, characterized in that, include: A fixing mechanism for attaching to the surface of the target object; The detection mechanism is connected to and driven by the fixed mechanism. The detection mechanism is used to emit ultrasonic waves to the blade. The detection mechanism includes two detection units that can be unfolded and closed relative to each other. Each detection unit includes a detection plate one and a detection plate two. The detection plate two is rotatably connected to the detection plate one via a rotating shaft. An ultrasonic transmitter is provided on the detection plate two. A width adaptive mechanism is connected between the two detection plates and is used to change the horizontal distance between the two detection plates as the detection plates rotate with the change of blade surface width, so that the two detection units adapt to the change of blade surface width. An anti-interference mechanism is used to drive the second detection plate to tilt around the rotation axis when the second detection plate moves along the surface of the blade and encounters an obstacle, so as to overcome the obstacle.

2. The ultrasonic nondestructive testing device according to claim 1, characterized in that, The width adaptive mechanism includes: The fixing strip is fixedly connected to both sides of the base of the testing mechanism; The telescopic strip is slidably connected within the fixed strip; A connecting component is used to drively connect the telescopic strip to the corresponding detection plate; When the two detection units are squeezed together by the blades, the telescopic strip extends from the fixed strip through the connecting assembly, thereby increasing the horizontal distance between the two detection plates.

3. The ultrasonic non-destructive testing device according to claim 2, characterized in that, The width adaptive mechanism further includes a reset elastic element connected between the telescopic bar and the fixed bar, wherein the reset elastic element is configured to accumulate or release the potential energy of the detection unit when it closes and expands.

4. The ultrasonic non-destructive testing device according to claim 2, characterized in that, The anti-interference mechanism includes: A sliding column is fixedly connected to the end of the rotating shaft; A sliding groove is connected to the telescopic strip, wherein the sliding column is slidably disposed within the sliding groove; A trigger element is disposed in the slide groove; A rotation trigger assembly is disposed on the sliding column, and is used to contact the trigger when the sliding column slides to the trigger position, so as to rotate the sliding column and the rotating shaft, thereby driving the detection plate II to tilt.

5. The ultrasonic non-destructive testing device according to claim 4, characterized in that, The trigger element includes a trapezoidal plate, and the rotation trigger assembly includes: The locking block is rotatably connected to the sliding column; The second locking block is fixed to the sliding column and is used to restrict the rotation direction of the locking block; When the sliding column slides and the locking block contacts the inclined surface of the trapezoidal plate, the locking block is pushed and the sliding column rotates due to the limiting position of the second locking block.

6. The ultrasonic nondestructive testing device according to claim 4 or 5, characterized in that, It also includes a damage prevention mechanism, which includes: An elastic plate, one end of which is fixed to the sliding column; A roller is rotatably connected to the other end of the elastic plate and abuts against the inner wall of the groove; The elastic plate and the roller are used to transmit rotational force to the inner wall of the groove when the sliding column has an unexpected rotational tendency, so as to limit the rotation of the sliding column through the reaction force.

7. The ultrasonic nondestructive testing device according to claim 1, characterized in that, The second detection plate is equipped with a rubber wheel for rolling contact with the blade surface.

8. The ultrasonic nondestructive testing device according to claim 1, characterized in that, The fixing mechanism includes: Box; Two adsorption tracks are rotatably connected to opposite sides of the housing and are used to adsorb onto the blade or adjacent structural surface and move. A robotic arm is rotatably connected to the housing, and its end is connected to the base of the detection mechanism, used to drive the detection mechanism to reach and scan the position to be detected on the blade.

9. The ultrasonic non-destructive testing device according to claim 1, characterized in that, The two detection units are symmetrically arranged in the detection mechanism.

10. The ultrasonic nondestructive testing device according to claim 4, characterized in that, Two triggers are arranged at relatively intervals along the length of the slide.

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