Flaw detection equipment for steam turbine blade detection

Abstract

The flaw detection equipment comprises a protection box and a cover plate hinged to the upper end of the protection box, a driving rod is arranged on the outer end face of the protection box, a crank is arranged at one end of the driving rod, and the other end of the driving rod controls opening and closing of the cover plate through a gear transmission assembly; a base plate is arranged in the protection box, and the driving rod controls the base plate to ascend and descend in the protection box through a turbine rack assembly. An ultrasonic detector is mounted on the substrate, and an ultrasonic probe is connected to the ultrasonic detector through a cable. According to the flaw detection equipment for steam turbine blade detection, opening and closing of the cover plate are controlled through the gear transmission assembly, and lifting of the base plate in the protection box is controlled through the turbine rack assembly, so that rapid storage and unfolding of the ultrasonic detector are achieved, the flexibility and efficiency of field detection are greatly improved, steam turbine blades do not need to be disassembled, and the detection efficiency is improved. And a lot of time and effort are not needed to carry and install the equipment, the complexity and time consumption of detection work are reduced, and the working efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine detection, and particularly relates to a flaw detection device for steam turbine blade detection. Background Art

[0002] Steam turbine blades are the core components in a steam turbine, undertaking the important task of converting the kinetic energy (or thermal energy) of steam into rotational mechanical energy. According to the publicly released information, steam turbine blades can be classified into moving blades, stationary blades, and guide blades, etc. according to the working state. Among them, most moving blades are installed on the impeller and are one of the important components constituting each working stage of the steam turbine. A moving blade consists of a blade tip, a blade body, and a blade root. Its structural characteristics enable the blade to adapt to the rapid increase in specific volume after steam expansion. During the operation of steam turbine blades, due to the need to bear the centrifugal force generated by the blades, shrouding, and lacing wires at high speeds, the acting force of the steam flow, as well as vibration stress and thermal stress, various defects often occur, such as wear, cracks, corrosion, etc. If these defects are not discovered and processed in time, it will lead to the damage of the steam turbine rotor, thereby affecting the performance and safety of the entire steam turbine.

[0003] In the prior art, when detecting steam turbine blades, it is usually necessary to disassemble the steam turbine blades, and the inspectors also need to spend extra time and effort to carry and install the equipment, thus reducing the efficiency of on-site detection. In addition, if the equipment needs to be detected at multiple positions, it will further increase the complexity and time consumption of the detection work, and the detection efficiency is not high. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a flaw detection device for steam turbine blade detection.

[0005] A flaw detection device for steam turbine blade detection proposed by the present invention includes a protective box and a cover plate hinged to the upper end of the protective box. A driving rod is arranged on the outer end face of the protective box. One end of the driving rod is provided with a crank, and the other end controls the opening and closing of the cover plate through a gear transmission assembly; a base plate is arranged inside the protective box, and the driving rod controls the lifting of the base plate in the protective box through a worm and rack assembly; an ultrasonic detector is installed on the base plate, and an ultrasonic probe is connected to the ultrasonic detector through a cable.

[0006] Preferably, the gear transmission assembly includes a first bevel gear group, a transmission rod and a second bevel gear group; a support plate is fixedly mounted on the outer end surface of the protective box above the other end of the driving rod, and the transmission rod is mounted in the support plate through a bearing; the first bevel gear group consists of two mutually meshing bevel gears and are respectively mounted on the other end of the driving rod and the lower end of the transmission rod; a rotating shaft is provided at the hinge between the cover plate and the protective box, and the second bevel gear group consists of two mutually meshing bevel gears and are respectively mounted on the upper end of the transmission rod and one end of the rotating shaft.

[0007] Preferably, the turbine rack assembly includes a worm, a turbine, a first gear and a rack plate. A turbine transmission rod is installed on the protective box below the driving rod through a bearing. The turbine and the first gear are respectively installed at both ends of the turbine transmission rod on the inside and outside of the protective box; the worm is sleeved on the driving rod and meshed with the turbine, and the rack plate is vertically fixed on the lower end surface of the base plate and meshed with the first gear.

[0008] Preferably, a plurality of telescopic rods are symmetrically arranged between the lower end surface of the base plate and the inner bottom of the protective box, and the telescopic rods consist of a telescopic upper tube and a telescopic lower tube, and the upper end of the telescopic upper tube and the lower end of the telescopic lower tube are respectively fixedly mounted on the lower end surface of the base plate and the inner bottom of the protective box, and the lower end of the telescopic upper tube is inserted into the upper end of the telescopic lower tube, and a telescopic spring is installed at the lower end of the telescopic upper tube, and the lower end of the telescopic spring is fixed on the inner wall of the telescopic lower tube or the inner bottom of the telescopic lower tube.

[0009] Preferably, a rotating drum assembly is installed on a substrate on one side of the ultrasonic detector, and the cable is wound around the rotating drum assembly.

[0010] Preferably, a cable retracting assembly is installed on the substrate on one side of the ultrasonic detector, and the cable retracting assembly includes a fixed plate, a drive motor, a second gear, a dual-wheel base and a third gear; the fixed plate is fixedly mounted on the substrate, the drive motor is mounted on the side end face of the fixed plate, and the second gear is fixedly mounted on the output shaft of the drive motor; the third gear is fixedly mounted on the side end face of the fixed plate through a gear shaft and meshes with the second gear; the dual-wheel base is mounted on the substrate and is transmission-connected with the second gear and the third gear, and one end of the cable connected to the ultrasonic probe is engaged in the dual-wheel base.

[0011] Preferably, the dual-wheel base is composed of a base bracket and two rollers installed in the base bracket, the base bracket is fixedly mounted on a substrate, the two rollers are coaxially connected to the second gear and the third gear respectively, and the cable is wound around or engaged with the rollers.

[0012] Preferably, a display screen is installed on the top of the ultrasonic detector and is connected to the ultrasonic detector for displaying ultrasonic images detected by the ultrasonic probe.

[0013] Preferably, a buckle is installed on the other side of the cover plate away from the hinge with the protection box, and a clamping groove is arranged on the outer end face of the protection box. The buckles and the clamping grooves correspond to each other and are engaged with each other.

[0014] Preferably, a handle is arranged in the center of the upper end face of the cover plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) For a flaw detection device for steam turbine blades of the present invention, the opening and closing of the cover plate is controlled by a gear transmission component, and the lifting of the substrate in the protection box is controlled by a turbine rack component; thereby realizing the rapid storage and deployment of the ultrasonic detector. The tester only needs to simply operate the crank to drive the linkage of the gear transmission component and the cover plate, and the turbine rack component and the substrate, so that the substrate and the ultrasonic detector above it can be lifted and lowered smoothly; at the same time, the cover plate automatically opens and closes, greatly improving the flexibility and efficiency of on-site detection. There is no need to disassemble the steam turbine blades, nor to spend a lot of time and energy on transporting and installing the equipment, reducing the complexity and time consumption of the detection work.

[0017] (2) For a flaw detection device for steam turbine blades of the present invention, through the rotating cylinder component and the cable winding and unwinding component built in the substrate, the automatic contraction and release of the cable installed with the ultrasonic probe are realized, which not only simplifies the preparation work before detection, but also avoids the problem that the cable layout is prone to be messy, ensures the smooth progress of the detection work, and the ultrasonic probe enters the steam turbine for detection, with high work efficiency.

[0018] (3) For a flaw detection device for steam turbine blades of the present invention, the design of the telescopic rod below the substrate ensures the stability of the detection platform, so that the ultrasonic detector can maintain accurate positioning during the detection process. The rotational connection between the cover plate and the protection box and the cooperation between the buckle and the clamping groove not only ensure the safe storage of the detection device, but also prevent damage caused by accidental collision during transportation and storage. The ingenious design realizes the compact combination of each component, making the whole device more compact in volume, convenient to carry and move. Description of the Drawings

[0019] Figure 1 : Schematic three-dimensional structure of the present invention Figure One (front view direction);

[0020] Figure 2 : Schematic three-dimensional structure of the present invention Figure Two (front side top view direction);

[0021] Figure 3 : Schematic three-dimensional structure of the present invention Figure Three (rear view direction);

[0022] Figure 4 : Schematic diagram of the internal three-dimensional structure of the present invention;

[0023] Figure 5 : Figure 1 Enlarged schematic diagram of the structure at position A in

[0024] Figure 6 : Figure 1 Enlarged schematic diagram of the structure at position B in

[0025] Figure 7 : is Figure 2 Enlarged schematic diagram of the structure at position C in

[0026] In the figure: 1. Protection box; 2. Crank; 3. Driving rod; 4. Worm; 5. Turbine; 6. First gear; 7. Rack plate; 8. Substrate; 9. First bevel gear set; 10. Transmission rod; 11. Second bevel gear set; 12. Cover plate; 13. Support plate; 14. Ultrasonic detector; 15. Cable; 16. Drum assembly; 17. Fixed plate; 18. Driving motor; 19. Second gear; 20. Double-wheel base; 21. Third gear; 22. Ultrasonic probe; 23. Display screen; 24. Buckle; 25. Card slot; 26. Handle; 27. Telescopic rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Embodiment 1:

[0029] Referring to Figures 1-7 , a flaw detection device for turbine blades proposed by the present invention includes a protection box 1 and a cover plate 12 hinged to the upper end of the protection box 1.

[0030] A substrate 8 is arranged inside the protection box 1, and an ultrasonic detector 14 is installed on the substrate 8. An ultrasonic probe 22 is connected to the ultrasonic detector 14 through a cable 15. The ultrasonic probe 22 connected through the cable 15 can detect and detect flaws in the turbine blades, which is convenient and reliable.

[0031] A driving rod 3 is arranged on the outer end face of the protection box 1. One end of the driving rod 3 is provided with a crank 2, and the other end is installed with a gear transmission assembly. By shaking the crank 2, the driving rod 3 is driven to rotate, and then the opening and closing of the cover plate 12 are controlled through the gear transmission assembly.

[0032] The base plate 8 turbine rack assembly provided inside the protective box 1 is connected to the drive rod 3. By shaking the crank 2, the rotation of the drive rod 3 is driven, and then the base plate 8 is driven to lift and lower inside the protective box 1 through the turbine rack assembly.

[0033] A flaw detection device for steam turbine blades of the present invention controls the opening and closing of the cover plate 12 through a gear transmission assembly, and controls the lifting and lowering of the base plate 8 inside the protective box 1 through a turbine rack assembly, thereby realizing the rapid storage and deployment of the ultrasonic detector 14. The detector only needs to simply operate the crank to drive the linkage of the gear transmission assembly and the cover plate 12, and the turbine rack assembly and the base plate 8, so that the base plate 8 and the ultrasonic detector 14 above it can be lifted and lowered smoothly; at the same time, the cover plate 12 automatically opens and closes, greatly improving the flexibility and efficiency of on-site detection. There is no need to disassemble the steam turbine blades, nor to spend a lot of time and effort on transporting and installing the equipment, reducing the complexity and time consumption of the detection work.

[0034] Embodiment 2:

[0035] Refer to Figures 1-7 , a flaw detection device for steam turbine blades proposed by the present invention includes a protective box 1 and a cover plate 12 hinged to the upper end of the protective box 1.

[0036] A base plate 8 is provided inside the protective box 1. An ultrasonic detector 14 is installed on the base plate 8, and an ultrasonic probe 22 is connected to the ultrasonic detector 14 through a cable 15. The ultrasonic probe 22 connected through the cable 15 can detect and flaw the steam turbine blades, which is convenient and reliable.

[0037] A drive rod 3 is provided on the outer end face of the protective box 1. One end of the drive rod 3 is provided with a crank 2, and the other end is provided with a gear transmission assembly. The gear transmission assembly includes a first bevel gear set 9, a transmission rod 10 and a second bevel gear set 11. A support plate 13 is fixedly installed on the outer end face of the protective box 1 above the other end of the drive rod 3, and the transmission rod 10 is installed in the support plate 13 through a bearing. The first bevel gear set 9 is composed of two meshing bevel gears and is respectively installed at the other end of the drive rod 3 and the lower end of the transmission rod 10. A rotating shaft is provided at the hinge of the cover plate 12 and the protective box 1. The second bevel gear set 11 is composed of two meshing bevel gears and is respectively installed at the upper end of the transmission rod 10 and one end of the rotating shaft. By shaking the crank 2, the rotation of the drive rod 3 is driven, and then through the transmission of the first bevel gear set 9, the transmission rod 10 and the second bevel gear set 11 in sequence, the cover plate 12 is driven to open and close automatically, which is simple to operate and convenient to use.

[0038] The turbine rack assembly of the substrate 8 provided in the protective box 1 is connected to the driving rod 3. The turbine rack assembly includes a worm 4, a turbine 5, a first gear 6 and a rack plate 7. A turbine transmission rod is installed through the protective box 1 below the driving rod 3 via a bearing. The turbine 5 and the first gear 6 are respectively installed at both ends of the turbine transmission rod on the inner and outer sides of the protective box 1. The worm 4 is sleeved on the driving rod 3 and meshes with the turbine 5. The rack plate 7 is vertically and fixedly arranged on the lower end face of the substrate 8 and meshes with the first gear 6. By shaking the crank 2, the rotation of the driving rod 3 is driven, and then through the transmission of the worm 4, the turbine 5, the first gear 6 and the rack plate 7 in sequence, the substrate 8 is driven to lift in the protective box 1, which facilitates the use and storage of the ultrasonic detector 14, the cable 15, the ultrasonic probe 22 and other equipment related to the detection and flaw detection of steam turbine blades installed on the substrate 8, which is convenient and fast.

[0039] For a flaw detection device for steam turbine blades of the present invention, the opening and closing of the cover plate 12 is controlled by a gear transmission assembly, and the lifting of the substrate 8 in the protective box 1 is controlled by a turbine rack assembly, thereby realizing the rapid storage and deployment of the ultrasonic detector 14. The detector only needs to simply operate the crank to drive the linkage of the gear transmission assembly and the cover plate 12, and the turbine rack assembly and the substrate 8, so that the substrate 8 and the ultrasonic detector 14 above it can be lifted smoothly; at the same time, the cover plate 12 automatically opens and closes, greatly improving the flexibility and efficiency of on-site detection. There is no need to disassemble the steam turbine blades, nor to spend a lot of time and effort in transporting and installing the equipment, reducing the complexity and time-consuming of the detection work.

[0040] Embodiment 3:

[0041] Refer to Figures 1-7 , a flaw detection device for steam turbine blades proposed by the present invention includes a protective box 1 and a cover plate 12 hinged to the upper end of the protective box 1.

[0042] On the other side of the cover plate 12 far from the hinge with the protective box 1, a buckle 24 is installed. On the outer end face of the protective box 1, a slot 25 is provided. There are at least two buckles 24 and slots 25, which correspond to each other one by one and can be engaged with each other. When the cover plate 12 moves to fit with the protective box 1, multiple buckles 24 can be synchronously inserted into multiple slots 25 provided on the side of the protective box 1 to realize the locking of the cover plate 12 and the protective box 1, improving the stability between the protective box 1 and the cover plate 12. In the center of the upper end face of the cover plate 12, a handle 26 is provided. The staff can carry the device portably through the handle 26 provided on the side of the cover plate 12 and maintain stability during the movement.

[0043] A substrate 8 is provided in the protective box 1, an ultrasonic detector 14 is installed on the substrate 8, a display screen 23 is installed on the top of the ultrasonic detector 14 and connected to the ultrasonic detector 14, for displaying the ultrasonic image detected by the ultrasonic probe 23. The ultrasonic detector 14 is connected to an ultrasonic probe 22 via a cable 15. The ultrasonic probe 22 connected via the cable 15 can detect and inspect the turbine blades, which is convenient and reliable.

[0044] A drum assembly 16 is installed on the base plate 8 on one side of the ultrasonic detector 14 , and the cable 15 is wound around the drum assembly 16 . The cable 15 can be retracted and released by rotating the drum assembly 16 , thereby preventing the cable 15 from becoming scattered or tangled.

[0045] A cable retracting assembly is installed on the substrate 8 on one side of the ultrasonic detector 14. The cable retracting assembly includes a fixed plate 17, a drive motor 18, a second gear 19, a double-wheel base 20 and a third gear 21. The fixed plate 17 is fixedly mounted on the substrate 8, the drive motor 18 is mounted on the side end surface of the fixed plate 17, and the second gear 19 is fixedly mounted on the output shaft of the drive motor 18. The third gear 21 is fixedly mounted on the side end surface of the fixed plate 17 through a gear shaft and meshes with the second gear 19. The double-wheel base 20 is mounted on the substrate 8 and is transmission-connected with the second gear 19 and the third gear 21. One end of the cable 15 connected with the ultrasonic probe 22 is engaged in the double-wheel base 20. The double-wheel base 20 is composed of a base bracket and two rollers installed in the base bracket. The base bracket is fixedly mounted on the substrate 8. The two rollers are coaxially connected with the second gear 19 and the third gear 21 respectively, and the cable 15 is wound around or engaged on the rollers.

[0046] By starting the driving motor 18, the second gear 19 arranged at its output end is controlled to rotate, so that the second gear 19 can drive a roller arranged inside the double-wheel base 20 to rotate, and a part of the cable 15 is wound and connected with the roller of the double-wheel base 20, so that the cable 15 is subjected to the power of rotation and begins to shrink; the other end of the cable 15 passes through the bottom of another roller inside the double-wheel base 20, and when the second gear 19 rotates, it drives the third gear 21 meshing with its side to rotate, and when the third gear 21 rotates, it drives another roller of the double-wheel base 20 to rotate, so that the cable 15 at the bottom of the other roller is synchronously contracted, so that the cable 15 is automatically and quickly contracted and wound around the outside of the drum assembly 16. Similarly, the driving motor 18 is controlled to rotate in the opposite direction, so that the cable 15 can be released from the drum assembly 16 through the double-wheel base 20. The cable retracting assembly can facilitate the storage and release of the cable 15, improve the convenience of using the ultrasonic probe 22 connected by the cable 15, and is convenient and reliable.

[0047] A driving rod 3 is provided on the outer end face of the protective box 1. One end of the driving rod 3 is provided with a crank 2, and the other end is installed with a gear transmission assembly. The gear transmission assembly includes a first bevel gear set 9, a transmission rod 10 and a second bevel gear set 11. A support plate 13 is fixedly installed on the outer end face of the protective box 1 above the other end of the driving rod 3. The transmission rod 10 is installed in the support plate 13 through a bearing. The first bevel gear set 9 is composed of two meshing bevel gears and is respectively installed at the other end of the driving rod 3 and the lower end of the transmission rod 10. A rotating shaft is provided at the hinge joint between the cover plate 12 and the protective box 1. The second bevel gear set 11 is composed of two meshing bevel gears and is respectively installed at the upper end of the transmission rod 10 and one end of the rotating shaft. By shaking the crank 2, the rotation of the driving rod 3 is driven, and then through the transmission of the first bevel gear set 9, the transmission rod 10 and the second bevel gear set 11 in sequence, the automatic opening and closing of the cover plate 12 is driven, and the operation is simple and convenient to use.

[0048] The base plate 8 turbine rack assembly provided in the protective box 1 is connected to the driving rod 3. The turbine rack assembly includes a worm 4, a turbine 5, a first gear 6 and a rack plate 7. A turbine transmission rod is installed through the protective box 1 below the driving rod 3 through a bearing. The turbine 5 and the first gear 6 are respectively installed at both ends of the turbine transmission rod on the inner and outer sides of the protective box 1. The worm 4 is sleeved on the driving rod 3 and meshes with the turbine 5. The rack plate 7 is vertically and fixedly arranged on the lower end face of the base plate 8 and meshes with the first gear 6. By shaking the crank 2, the rotation of the driving rod 3 is driven, and then through the transmission of the worm 4, the turbine 5, the first gear 6 and the rack plate 7 in sequence, the base plate 8 is driven to lift in the protective box 1, which is convenient for the use and storage of the ultrasonic detector 14, the cable 15, the ultrasonic probe 22 and other equipment related to the detection and flaw detection of steam turbine blades installed on the base plate 8, and is convenient and fast.

[0049] A plurality of telescopic rods 27 are symmetrically arranged between the lower end face of the base plate 8 and the inner bottom of the protective box 1. The telescopic rod 27 is composed of a telescopic upper tube and a telescopic lower tube. The upper end of the telescopic upper tube and the lower end of the telescopic lower tube are respectively fixedly installed on the lower end face of the base plate 8 and the inner bottom of the protective box 1. The lower end of the telescopic upper tube is inserted into the upper end of the telescopic lower tube. A telescopic spring is installed at the lower end of the telescopic upper tube, and the lower end of the telescopic spring is fixed on the inner wall of the telescopic lower tube or the inner bottom of the telescopic lower tube. During the process of the base plate 8 descending and being stored, the telescopic upper tube and the telescopic lower tube of the telescopic rod 27 slide relative to each other, and the telescopic spring is compressed; when the base plate 8 rises, the compressed telescopic spring gradually restores its deformation, which can help the base plate 8 to rise. At the same time, the relative sliding of the telescopic upper tube and the telescopic lower tube of the telescopic rod 27 can help to improve the stability of the base plate 8 during lifting and lowering.

[0050] A flaw detection device for steam turbine blades of the present invention controls the opening and closing of the cover plate 12 through a gear transmission assembly, and controls the lifting of the substrate 8 in the protective box 1 through a worm and rack assembly, thereby realizing the rapid storage and deployment of the ultrasonic detector 14. The tester only needs to simply operate the crank to drive the linkage of the gear transmission assembly and the cover plate 12, and the worm and rack assembly and the substrate 8, so that the substrate 8 and the ultrasonic detector 14 above can be lifted and lowered smoothly; at the same time, the cover plate 12 automatically opens and closes, greatly improving the flexibility and efficiency of on-site detection. There is no need to disassemble the steam turbine blades, nor to spend a lot of time and effort on transporting and installing the equipment, reducing the complexity and time consumption of the detection work.

[0051] A flaw detection device for steam turbine blades of the present invention realizes the automatic contraction and release of the cable 15 installed with the ultrasonic probe 22 through the rotating cylinder assembly 16 and the cable winding and unwinding assembly built in the substrate 8. This not only simplifies the preparation work before detection, but also avoids the problem that the cable 15 is prone to be arranged in a messy manner, ensuring the smooth progress of the detection work. And the ultrasonic probe 22 enters the steam turbine for detection, with high working efficiency.

[0052] A flaw detection device for steam turbine blades of the present invention, the design of the telescopic rod 27 below the substrate 8 ensures the stability of the detection platform, so that the ultrasonic detector 14 can maintain accurate positioning during the detection process. The rotational connection between the cover plate 12 and the protective box 1 and the cooperation between the buckle 24 and the card slot 25 not only ensure the safe storage of the detection device, but also prevent damage caused by accidental collision during transportation and storage. The ingenious design realizes the compact combination of each component, making the whole device more compact in volume, convenient to carry and move.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes an equivalent replacement or change, and should be covered within the protection scope of the present invention.

Claims

1. A flaw detection device for steam turbine blade detection, comprising a protective box (1) and a cover plate (12) hinged to the upper end of the protective box (1), characterized in that, A drive rod (3) is provided on the outer end face of the protective box (1). A crank (2) is provided at one end of the drive rod (3), and the opening and closing of the cover plate (12) is controlled by a gear transmission assembly at the other end thereof; a substrate (8) is provided inside the protective box (1), and the drive rod (3) controls the lifting of the substrate (8) inside the protective box (1) through a worm and rack assembly; an ultrasonic detector (14) is mounted on the substrate (8), and an ultrasonic probe (22) is connected to the ultrasonic detector (14) through a cable (15).

2. The flaw detection device for steam turbine blade detection according to claim 1, characterized in that, The gear transmission assembly includes a first bevel gear set (9), a transmission rod (10) and a second bevel gear set (11). A support plate (13) is fixedly mounted on the outer end face of the protective box (1) above the other end of the drive rod (3), and the transmission rod (10) is mounted in the support plate (13) through a bearing; the first bevel gear set (9) is composed of two meshing bevel gears and is respectively mounted at the other end of the drive rod (3) and the lower end of the transmission rod (10); a rotating shaft is provided at the hinge of the cover plate (12) and the protective box (1), and the second bevel gear set (11) is composed of two meshing bevel gears and is respectively mounted at the upper end of the transmission rod (10) and one end of the rotating shaft.

3. A flaw detection device for steam turbine blade detection according to claim 1, characterized in that, The worm and rack assembly includes a worm (4), a turbine (5), a first gear (6) and a rack plate (7). A turbine transmission rod is installed through the protective box (1) below the drive rod (3) through a bearing, and the turbine (5) and the first gear (6) are respectively mounted at both ends of the turbine transmission rod inside and outside the protective box (1); the worm (4) is sleeved on the drive rod (3) and meshes with the turbine (5), and the rack plate (7) is vertically and fixedly arranged on the lower end face of the substrate (8) and meshes with the first gear (6).

4. A flaw detection device for steam turbine blade detection according to claim 3, characterized in that, A plurality of telescopic rods (27) are symmetrically arranged between the lower end face of the substrate (8) and the inner bottom of the protective box (1). The telescopic rod (27) is composed of a telescopic upper tube and a telescopic lower tube. The upper end of the telescopic upper tube and the lower end of the telescopic lower tube are respectively fixedly mounted on the lower end face of the substrate (8) and the inner bottom of the protective box (1). The lower end of the telescopic upper tube is inserted into the upper end of the telescopic lower tube, and a telescopic spring is mounted at the lower end of the telescopic upper tube. The lower end of the telescopic spring is fixed on the inner wall of the telescopic lower tube or the inner bottom of the telescopic lower tube.

5. A flaw detection device for steam turbine blade detection according to claim 1, characterized in that, A rotating cylinder assembly (16) is mounted on the substrate (8) on one side of the ultrasonic detector (14), and the cable (15) is wound on the rotating cylinder assembly (16).

6. The flaw detection device for steam turbine blade detection according to claim 1, characterized in that, A cable winding and unwinding assembly is installed on the substrate (8) on one side of the ultrasonic detector (14). The cable winding and unwinding assembly includes a fixing plate (17), a driving motor (18), a second gear (19), a double-wheel base (20) and a third gear (21); the fixing plate (17) is fixedly installed on the substrate (8), the driving motor (18) is installed on the side end face of the fixing plate (17), and the second gear (19) is fixedly installed on the output shaft of the driving motor (18); the third gear (21) is fixedly installed on the side end face of the fixing plate (17) through a gear shaft rod and meshes with the second gear (19); the double-wheel base (20) is installed on the substrate (8) and is in transmission connection with the second gear (19) and the third gear (21), and one end of the cable (15) connected with the ultrasonic probe (22) is clamped in the double-wheel base (20).

7. The flaw detection device for steam turbine blade detection according to claim 6, characterized in that, The double-wheel base (20) consists of a base bracket and two rollers installed in the base bracket. The base bracket is fixedly installed on the substrate (8), and the two rollers are coaxially connected with the second gear (19) and the third gear (21) respectively. The cable (15) is wound or clamped on the rollers.

8. The flaw detection device for steam turbine blade detection according to claim 1, characterized in that, A display screen (23) is installed on the top of the ultrasonic detector (14) and is connected to the ultrasonic detector (14) for displaying the ultrasonic image detected by the ultrasonic probe (23).

9. The flaw detection device for steam turbine blade detection according to claim 1, characterized in that, A buckle (24) is installed on the other side of the cover plate (12) away from the hinge joint with the protection box (1). A clamping groove (25) is arranged on the outer end face of the protection box (1). The buckle (24) corresponds to the clamping groove (25) one by one and is clamped with it.

10. The flaw detection device for steam turbine blade detection according to claim 1, characterized in that, A handle (26) is arranged in the center of the upper end face of the cover plate (12).

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