A special tool and method for ultrasonic testing of the inner cambered blade root of a compressor rotor blade

Abstract

The present invention discloses a special tooling and method for ultrasonic detection of the inner curved surface root of a compressor moving blade, including a profiling support frame, a probe clamping module and a stroke driver, etc. The profiling support frame is designed to be profiling of the actual moving blade, and provides support for the tooling, including an inner curved surface, a back curved surface profiling body, a suction magnet, a rotating shaft, and a fixing bolt. The guide body is a linear guide structure, which provides guidance for the probe scanning, including a guide rail, a sliding block, a plane rack, and a positioning bolt. The probe clamping module is a spring telescopic structure, which is used to fix the probe, including a probe fixing frame, a support arm, a stud, a spring, a fixing bolt, a nut, and an ultrasonic probe. The stroke driver is a motor gear structure, which drives the probe to scan, including a gear, a motor, a bracket, a gear shaft, and a fixing bolt. The present invention can perform fully automated ultrasonic detection of the inner curved surface root of a moving blade without opening the cylinder body of the compressor during the temporary shutdown of the unit. The probe is stable and does not shake, the scanning path is fixed, and the stroke is accurately positioned.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic non-destructive testing, and in particular is a special tool and method for ultrasonic testing of the inner cambered blade root of a compressor rotor blade. Background Art

[0002] The compressor moving blades are the core components of the compressor that do work on the gas turbine inlet gas. They are composed of two parts: the blade body and the blade root. The blade body is the part where the blade interacts with the airflow, and the blade root is the part where the blade is assembled to the rotor disc slot. Dovetail blade roots are generally used. As a rotating machine, the compressor moving blades are subjected to complex alternating stresses during service, and are prone to crack defects at the back arc surface and inner arc surface variable cross-section position of the dovetail blade root, seriously affecting the safe and stable operation of the unit. Therefore, in order to ensure the safety and reliability of the gas turbine compressor moving blades, it is very necessary to regularly perform non-destructive testing on the compressor moving blade roots. Especially when the moving blades are not disassembled for maintenance, the effective detection of crack defects on the inner arc surface and back arc surface of the blade root has become the focus of current gas turbine operation and maintenance technology researchers.

[0003] Ultrasonic testing has the advantages of not being restricted by the shape and size of components, strong on-site adaptability, simple operation of the device and equipment, no potential harm to the human body, and high accuracy and good repeatability of the test results. It is very suitable for in-situ testing of complex structural components without disassembly. The ultrasonic detection device and method for blade roots of moving blades applied by foreign companies (patent number US7302851B2) couples the probe to the inner arc surface of the blade body, and the sound wave passes through the blade body to the back arc surface blade root area for detection. It is only suitable for ultrasonic detection of the back arc surface blade root of moving blades. For the inner arc surface blade root, due to the large width of the inner arc surface blade root platform (about 5mm to 15mm wide), there is no path for the sound beam to propagate from the blade body to the blade root, so this method and device cannot be implemented. In view of the large width of the inner arc surface blade root platform, there is a condition to directly place the ultrasonic probe at this position. A micro phased array ultrasonic linear array longitudinal wave straight probe can be used to manually scan the inner arc surface blade root platform. The sound wave propagates vertically downward and diffuses at a certain angle, which can realize the effective detection of crack defects at the variable cross-section position of the inner arc surface blade root of the moving blade. However, due to the small size of the phased array ultrasonic probe used, the coupling surface is generally only 40mm 2 ~60mm 2 During manual scanning, the scanning path cannot be fixed and the probe is prone to shaking, resulting in poor stability of the ultrasonic echo signal, affecting the detection sensitivity and repeatability of the results. At the same time, the shape of the inner arc blade root platform is irregular and there is interference from the rounding at the transition between the blade body and the blade root, which further increases the instability during scanning. At the same time, manual scanning cannot accurately obtain information about the location of the probe, affecting the precise positioning of defects. In addition, manual scanning requires the inspector to manually couple the probe throughout the process, and when performing inspections during the temporary shutdown of the unit, the inlet guide vanes must be manually bypassed, which greatly reduces the reliability of the inspection and consumes a lot of manpower and material resources.

[0004] Therefore, developing a special tooling and method for ultrasonic inspection of the inner curved blade root of a compressor moving blade can overcome the shortcomings of an unstable scanning path caused by manual scanning during ultrasonic inspection of the inner curved blade root, unstable echo signal caused by easy shaking of the probe, and poor repeatability and reliability of the inspection results. It can also realize automated scanning with precise stroke positioning without opening the compressor cylinder during temporary shutdown of the unit. This is an urgent problem to be solved in the ultrasonic inspection of the inner curved blade root of a gas turbine compressor moving blade. Summary of the invention

[0005] The purpose of the present invention is to provide a special tooling and method for ultrasonic inspection of the inner curved surface of the blade root of a compressor moving blade in response to the technical demand that the probe must be controlled to be stable and not shake, the scanning path must be fixed, the stroke must be accurately positioned, and the full-automatic execution must be performed during the temporary shutdown of the unit. The device and method are simple and easy to operate, and can realize fully automatic scanning of ultrasonic inspection of the inner curved surface of the blade root of the moving blade without opening the compressor cylinder during the temporary shutdown of the unit. The shortcomings of unstable detection signals, poor result repeatability and reliability caused by the unfixed scanning path and shaking of the probe can be avoided, and real-time and accurate positioning of the probe stroke position can be realized.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A special tool for ultrasonic detection of the inner cambered blade root of a compressor rotor blade comprises a profiling support frame, a guide body, a probe clamping module and a travel driver; wherein the profiling support frame is connected to the guide body, one end of the guide body is connected to the probe clamping module, and the other end of the guide body is connected to the travel driver.

[0008] A further improvement of the present invention is that the profiled support frame comprises an inner cambered surface profiled body, a back cambered surface profiled body, a suction magnet, a rotating shaft and a first fixing bolt of the moving blade; the inner cambered surface profiled body and the back cambered surface profiled body have a variable cross-section curved surface structure inside, which is completely consistent with the shape of the moving blade body; the bottom shapes of the inner cambered surface profiled body and the back cambered surface profiled body are consistent with the blade root platform of the moving blade and are provided with a bottom suction magnet; the inner cambered surface profiled body is provided with a groove for the sliding of the probe; the outer side of the groove is flush with the outer edge of the inner cambered surface root to be inspected; the inner cambered surface profiled body and the back cambered surface profiled body adopt a split structure, one end of which is rotatably connected by a rotating shaft, and the other end is fastened and connected by a first fastening bolt;

[0009] The guide body includes a guide rail, a sliding block, a plane rack and a positioning bolt; the guide rail is connected to the inner arc-shaped body, positioning bolts are arranged at both ends of the guide rail, and the sliding block is slidably matched with the guide rail;

[0010] The probe clamping module includes a probe fixing frame, a support arm, a stud, a spring, a second fixing bolt, a nut and an ultrasonic probe; the support arm is connected to the guide body sliding block, one end of the stud is connected to the probe fixing frame, the other end of the stud is embedded in the round hole of the support arm head, the nut is rotatably installed on the top of the stud, the spring is sleeved in the stud, the second fixing bolt is connected to the probe fixing frame, and the ultrasonic probe is placed in the probe fixing frame;

[0011] The travel driver includes a gear, a motor, a bracket, a gear shaft and a third fixing bolt; the bracket is connected to the guide body sliding block, the motor is connected to the bracket with a third fixing bolt, one end of the gear shaft is connected to the motor, and the other end of the gear shaft is connected to the gear, the gear is meshed with the plane rack in the guide body, and the motor is a servo motor, which has both driving and encoding positioning functions.

[0012] A further improvement of the present invention is that the attracting magnet of the contoured support frame is a cylindrical NdFeB strong magnet.

[0013] A further improvement of the present invention is that the first fixing bolt is a hexagon socket countersunk bolt.

[0014] A further improvement of the present invention is that the guide rail of the guide body is a single T-shaped guide rail, and the plane rack is a cylindrical rack.

[0015] A further improvement of the present invention is that the positioning bolt is an external hexagonal bolt.

[0016] A further improvement of the present invention is that the spring in the probe clamping module is a stainless steel coil spring.

[0017] A further improvement of the present invention is that the second fixing bolt is an external hexagonal bolt, the stud is a single-head stud, and the nut is a knurled cylindrical nut.

[0018] A further improvement of the present invention is that the gear in the travel driver is a cylindrical gear, the motor is a micro servo motor, the gear shaft is a single keyway cylindrical shaft, and the third fixing bolt is an external hexagonal bolt.

[0019] A method for ultrasonic testing of the inner cambered blade root of a compressor rotor blade, based on a special tool for ultrasonic testing of the inner cambered blade root of a compressor rotor blade, comprising:

[0020] Place the back arc profiled body in the profiled support frame on the back arc blade root platform of the moving blade, place the inner arc profiled body on the inner arc blade root platform of the moving blade, ensure the fixation of the profiled support frame and the blade root platform by the suction magnet, and fix the back arc profiled body and the inner arc profiled body by the first fastening bolt; insert the sliding block in the guide body into the guide rail, mesh the gear in the stroke driver with the plane rack, and apply a proper amount of lubricating butter; place the ultrasonic probe in the probe fixing frame, and tighten the second front and rear fixing bolts; put the two spring sleeves on the studs in the probe clamping module, insert the studs into the round holes on the top of the support arm, place the ultrasonic probe in the groove, and then tighten the nut on the top of the stud;

[0021] Connect the ultrasonic probe to the main unit of the phased array ultrasonic detector and the motor to the main unit of the stroke control; apply an appropriate amount of grease to the groove; start the motor to drive the ultrasonic probe to scan along the groove from the air inlet side to the air outlet side of the moving blade. The main unit of the phased array ultrasonic detector records and stores the reflected sound waves at the variable cross-section of the blade root platform on the inner curved surface of the moving blade in real time, and the stroke control main unit records and stores the stroke position of the ultrasonic probe in real time, and then generates A\B\C\D scanning images; if re-inspection is required, the position and direction of the ultrasonic probe can be adjusted at any time through the stroke control main unit.

[0022] The present invention has at least the following beneficial technical effects:

[0023] The present invention provides a special tool and method for ultrasonic detection of the inner cambered blade root of a compressor moving blade. When the compressor is not uncovered during temporary shutdown of the unit, the fully automated ultrasonic detection of the inner cambered blade root of the moving blade can be performed at the bell mouth after opening the manhole door of the air intake chamber. The tool is portable and easy to operate, and can achieve stable and non-shaking coupling of the probe, fixed and consistent scanning path, and precise stroke positioning. The detection speed is fast, and the results are accurate, reliable, and repeatable. The portability and reliability of quality condition monitoring of the inner cambered blade root of the compressor moving blade can be greatly improved, and the safe and stable operation of the unit can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a structural schematic diagram of a special tool for ultrasonic detection of the inner cambered blade root of a compressor rotor blade.

[0025] Figure 2 The present invention is a cross-sectional view of a special tool for ultrasonic testing of the inner cambered blade root of a compressor rotor blade.

[0026] Figure 3 The present invention is a bottom view of a special tool for ultrasonic detection of the inner cambered blade root of a compressor rotor blade.

[0027] Figure 4 The invention discloses a special tool for ultrasonic detection of the inner cambered blade root of a compressor moving blade installed on a moving blade.

[0028] Description of reference numerals:

[0029] 1. Profiling support frame, 2. Guide body, 3. Probe clamping module, 4. Travel driver;

[0030] 101. inner arc-shaped body, 102. back arc-shaped body, 103. suction magnet, 104. rotating shaft, 105. first fixing bolt, 106. groove; 201. guide rail, 202. sliding block, 203. plane rack, 204. positioning bolt; 301. probe fixing frame, 302. support arm, 303. stud, 304. spring, 305. second fixing bolt, 306. nut, 307. ultrasonic probe; 401. gear, 402. motor, 403. bracket, 404. gear shaft, 405. third fixing bolt. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0032] See attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 The present invention provides a special tooling for ultrasonic detection of the inner curved blade root of a compressor rotor blade, comprising a profiling support frame 1, a guide body 2, a probe clamping module 3, and a stroke driver 4; wherein the profiling support frame 1 is connected to the guide body 2, one end of the guide body 2 is connected to the probe clamping module 3, and the other end of the guide body 2 is connected to the stroke driver 4.

[0033] The profiled support frame 1 includes a moving blade inner arc profiled body 101, a back arc profiled body 102, a suction magnet 103, a rotating shaft 104, and a first fixing bolt 105. The inner arc profiled body 101 and the back arc profiled body 102 are variable cross-section curved surface structures, which are completely consistent with the shape of the moving blade body. This feature can ensure that the tooling is completely fitted to the moving blade body, and no slight axial shaking will occur during the scanning process. The bottom shape of the inner arc profiled body 101 and the back arc profiled body 102 is consistent with the moving blade root platform and 8 bottom suction magnets 103 are set. This feature can ensure that the tooling is fixed in the longitudinal direction of the blade without shaking, and facilitates the on-site disassembly and assembly of the tooling. The inner arc surface profiling body 101 is provided with a probe sliding groove 106, the outer side of the groove 106 is flush with the outer edge of the inner arc surface blade root to be inspected, the size of the groove 106 is consistent with the shape of the probe, and it is a rectangular structure. This feature can ensure that the scanning path of the probe is fixed and consistent, and always proceeds along the edge of the blade root platform without shaking. In addition, the inner arc surface profiling body 101 and the back arc surface profiling body 102 adopt a split structure, one end of which is rotatably connected by a rotating shaft 104. The rotating shaft 104 is on the inner arc surface profiling body 101, and the shaft sleeve is on the back arc surface profiling body 102. The other end is fastened with a first fastening bolt 105. Fastening flanges are provided on the inner arc surface profiling body 101 and the back arc surface profiling body 102, which can adapt to the detection of moving blades without opening the cylinder. This feature can facilitate the rapid disassembly and switching of tooling between each moving blade;

[0034] The guide body 2 includes a guide rail 201, a sliding block 202, a plane rack 203, and a positioning bolt 204. The guide rail 201 is connected to the inner arc-shaped body 101, and two positioning bolts 204 are arranged at both ends of the guide rail 201 for positioning the sliding block 202. This feature can ensure that the sliding block 202 will not slide out of the guide rail 201 and fall into the cylinder body. The sliding block 202 and the guide rail 201 are slidably matched, and the guide rail structure is conducive to ensuring the straightness of the stroke and there is no problem of sliding jam;

[0035] The probe clamping module 3 includes a probe fixing frame 301, a support arm 302, a stud 303, a spring 304, a second fixing bolt 305, a nut 306, and an ultrasonic probe 307. The support arm 302 is connected to the sliding block 202 of the guide body 2, one end of the stud 303 is connected to the probe fixing frame 301, and the other end of the stud 303 is embedded in the round hole of the head of the support arm 302. The nut 306 is rotatably installed on the top of the stud 303. The stud 303 is symmetrical on both sides. The spring 304 is sleeved in the stud 303. The spring 304 is symmetrical on both sides. This feature can ensure that the ultrasonic probe 307 has sufficient coupling force with the blade root platform and the force is uniform. The second fixing bolt 305 is connected to the probe fixing frame 301. There are two second fixing bolts 305, one at the front and one at the back. The ultrasonic probe 307 is placed in the probe fixing frame 301. The ultrasonic probe 307 is fixed by rotating the second fixing bolt 305. The probe fixing frame 301 can be replaced on site, allowing ultrasonic probes 307 of different sizes to be connected to the tooling.

[0036] The travel driver 4 includes a gear 401, a motor 402, a bracket 403, a gear shaft 404, and a third fixing bolt 405. The bracket 403 is connected to the sliding block 202 of the guide body 2, the motor 402 is connected to the bracket 403 by the third fixing bolt 405, one end of the gear shaft 404 is connected to the motor 402, and the other end of the gear shaft 404 is connected to the gear 401, the gear 401 is meshed with the plane rack 203 in the guide body 2, the motor 402 is a servo motor, and has both driving and encoding positioning functions, the motor 402 rotates to drive the gear 401 to rotate, and then drives the sliding block 202 and the ultrasonic probe 307 to move along the groove 106, the meshing structure will not slip, and the transmission efficiency is high, which can ensure the accuracy of the travel position and the smoothness of the scanning operation.

[0037] The suction magnet 103 of the contoured support frame 1 is a cylindrical NdFeB strong magnet, which can ensure the strong adsorption of the tooling and the blade root platform. The first fixing bolt 105 is a hexagonal countersunk bolt, which is convenient for the rapid disassembly and assembly of the tooling on site;

[0038] The guide rail 201 of the guide body 2 is a single T-shaped guide rail, the plane rack 203 is a cylindrical rack, and the positioning bolt 204 is an external hexagonal bolt;

[0039] The spring 304 in the probe clamping module 3 is a stainless steel coil spring, the second fixing bolt 305 is an external hexagonal bolt, the stud 303 is a single-head stud, and the nut 306 is a knurled cylindrical nut, which facilitates the rapid disassembly, assembly and fixation of the on-site probe.

[0040] The gear 401 in the travel driver 4 is a cylindrical gear, the motor 402 is a micro servo motor, the gear shaft 404 is a single keyway cylindrical shaft, the third fixing bolt 405 is an external hexagonal bolt, and the servo motor has both driving and positioning functions, with high positioning accuracy and good stability in use.

[0041] See attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 In practical application, the method of using the present invention is as follows:

[0042] 1. Place the back arc profiled body 102 in the profiled support frame 1 on the back arc surface blade root platform of the moving blade, place the rotating shaft 104 of the inner arc surface profiled body 101 in the circular hole of the back arc surface profiled body 102, rotate the inner arc surface profiled body 101 and place it on the inner arc surface blade root platform of the moving blade, ensure the fixation of the profiled support frame 1 and the blade root platform by the suction magnet 103, and use the first fastening bolt 105 to fix the back arc surface profiled body 102 and the inner arc surface profiled body 101;

[0043] 2. Insert the sliding block 202 in the guide body 2 into the guide rail 201, mesh the gear 401 in the travel driver 4 with the plane rack 203, and apply a proper amount of lubricating butter;

[0044] 3. Place the ultrasonic probe 307 in the probe clamping module 3 in the probe fixing frame 301, and tighten the front and rear second fixing bolts 305 to fix the ultrasonic probe 307;

[0045] 4. Cover the two springs 304 on the stud 303 in the probe clamping module 3, insert the stud 303 into the round hole at the top of the support arm 302, place the ultrasonic probe 307 in the groove 106 in the contoured support frame 1, and then tighten the two nuts 306 on the top of the stud 303;

[0046] 5. Connect the ultrasonic probe 307 to the mainframe of the phased array ultrasonic detector, and connect the motor 402 to the stroke control mainframe;

[0047] 6. Apply a proper amount of grease to the groove 106 in the guide body 2 to play the role of ultrasonic probe coupling;

[0048] 7. Start the inspection, start the motor 402, drive the ultrasonic probe 307 to scan along the groove 106 from the air inlet side to the air outlet side of the moving blade, the phased array ultrasonic detector host records and stores the reflected sound waves at the variable cross-section of the blade root platform on the inner curved surface of the moving blade in real time, and the stroke control host records and stores the stroke position of the ultrasonic probe 307 in real time, and then generates A\B\C\D scanning images for monitoring and judging the quality status of the inner curved surface blade root. If re-inspection is required, the position and direction of the ultrasonic probe 307 can be adjusted at any time through the stroke control host.

[0049] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A special tool for ultrasonic testing of the inner cambered blade root of a compressor rotor blade, characterized in that: The invention comprises a contour support frame (1), a guide body (2), a probe clamping module (3) and a travel driver (4); wherein the contour support frame (1) is connected to the guide body (2), one end of the guide body (2) is connected to the probe clamping module (3), and the other end of the guide body (2) is connected to the travel driver (4); The profile support frame (1) comprises an inner camber profile body (101), a back camber profile body (102), an attraction magnet (103), a rotating shaft (104) and a first fixing bolt (105) of the moving blade; the inner camber profile body (101) and the back camber profile body (102) are internally variable cross-section curved surface structures, which are completely consistent with the shape of the moving blade body; the bottom shapes of the inner camber profile body (101) and the back camber profile body (102) are consistent with the blade root platform of the moving blade and are provided with a bottom attraction magnet (103); the inner camber profile body (101) is provided with a groove (106) for the sliding of the probe; the outer side of the groove (106) is flush with the outer edge of the inner camber blade root to be inspected; the inner camber profile body (101) and the back camber profile body (102) adopt a split structure, one end of which is rotatably connected by the rotating shaft (104), and the other end is fastened and connected by the first fixing bolt (105); The guide body (2) comprises a guide rail (201), a sliding block (202), a plane rack (203) and a positioning bolt (204); the guide rail (201) is connected to the inner arc-shaped body (101), positioning bolts (204) are arranged at both ends of the guide rail (201), and the sliding block (202) and the guide rail (201) are slidably matched; The probe clamping module (3) comprises a probe fixing frame (301), a support arm (302), a stud (303), a spring (304), a second fixing bolt (305), a nut (306) and an ultrasonic probe (307); the support arm (302) is connected to the sliding block (202) of the guide body (2); one end of the stud (303) is connected to the probe fixing frame (301); the other end of the stud (303) is embedded in the circular hole of the head of the support arm (302); the nut (306) is rotatably mounted on the top of the stud (303); the spring (304) is sleeved in the stud (303); the second fixing bolt (305) is connected to the probe fixing frame (301); and the ultrasonic probe (307) is placed in the probe fixing frame (301); The travel driver (4) comprises a gear (401), a motor (402), a bracket (403), a gear shaft (404) and a third fixing bolt (405); the bracket (403) is connected to the sliding block (202) of the guide body (2); the motor (402) is connected to the bracket (403) by the third fixing bolt (405); one end of the gear shaft (404) is connected to the motor (402); the other end of the gear shaft (404) is connected to the gear (401); the gear (401) is meshed with the plane rack (203) of the guide body (2); the motor (402) is a servo motor, and has both driving and encoding positioning functions.

2. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The attracting magnet (103) of the contoured support frame (1) is a cylindrical NdFeB strong magnet.

3. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The first fixing bolt (105) is a hexagon socket countersunk bolt.

4. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The guide rail (201) of the guide body (2) is a single T-shaped guide rail, and the plane rack (203) is a cylindrical rack.

5. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The positioning bolt (204) is an external hexagonal bolt.

6. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The spring (304) in the probe clamping module (3) is a stainless steel coil spring.

7. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The second fixing bolt (305) is an external hexagonal bolt, the stud (303) is a single-head stud, and the nut (306) is a knurled cylindrical nut.

8. The special tooling for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to claim 1, characterized in that: The gear (401) in the travel driver (4) is a cylindrical gear, the motor (402) is a micro servo motor, the gear shaft (404) is a single keyway cylindrical shaft, and the third fixing bolt (405) is an external hexagonal bolt.

9. A method for ultrasonic testing of the inner cambered blade root of a compressor rotor blade, characterized in that: The method is based on a special tool for ultrasonic testing of the inner cambered blade root of a compressor rotor blade according to any one of claims 1 to 8, comprising: The back arc-shaped body (102) in the profile support frame (1) is placed on the back arc-shaped blade root platform of the moving blade, and the inner arc-shaped body (101) is placed on the inner arc-shaped blade root platform of the moving blade. The fixation of the profile support frame (1) and the blade root platform is ensured by the suction magnet (103). The back arc-shaped body (102) and the inner arc-shaped body (101) are fixed by the first fixing bolt (105); the sliding block (202) in the guide body (2) is inserted into the guide rail (201), and the stroke driver (4) is fixed. The middle gear (401) is meshed with the plane rack (203), and a proper amount of lubricating butter is applied; the ultrasonic probe (307) is placed in the probe fixing frame (301), and the second front and rear fixing bolts (305) are tightened; two springs (304) are sheathed on the stud (303) in the probe clamping module (3), the stud (303) is inserted into the circular hole at the top of the support arm (302), the ultrasonic probe (307) is placed in the groove (106), and the nut (306) is then tightened on the top of the stud (303); Connect the ultrasonic probe (307) to the mainframe of the phased array ultrasonic detector, and connect the motor (402) to the mainframe of the stroke control; apply a proper amount of grease to the groove (106); start the motor (402), drive the ultrasonic probe (307) to scan along the groove (106) from the air inlet side to the air outlet side of the moving blade, the mainframe of the phased array ultrasonic detector records and stores the reflected sound waves at the variable cross-section of the blade root platform on the inner curved surface of the moving blade in real time, and the stroke control mainframe records and stores the stroke position of the ultrasonic probe (307) in real time, and then generates A\B\C\D scanning images; if re-inspection is required, the position and direction of the ultrasonic probe (307) can be adjusted at any time through the stroke control mainframe.

Images