A lifting scanning device for TOFD inspection of pressure pipeline welds

Abstract

The present invention relates to the field of pipeline testing technology, and specifically to a pressure pipeline weld TOFD detection lifting and scanning device, comprising a support rod, two groups of roller assemblies installed on the support rod, and two groups of probe assemblies, the rollers of the two groups of roller assemblies being jointly attached to the top of the outer walls of the two pipe bodies, and positioning mechanisms being provided at the front and rear edges of the upper end of the support rod. This TOFD detector not only facilitates workers to conduct complete weld inspections on pipe bodies with larger diameters in windy and sandy areas, but also, under the action of the top plate and four sponge blocks, the two groups of probe assemblies can be completely shielded for weld inspection to avoid contact with sand and dust, and the sponge blocks can also clean the welds, thereby improving the accuracy of the inspection. At the same time, due to the deformability of the sponge blocks, it can also adapt to pipe bodies of different diameters to completely block the two groups of probe assemblies and clean the welds, and has good applicability. This TOFD detector can also be easily temporarily fixed on the pipe body.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline testing, and in particular to a lifting and scanning device for TOFD detection of pressure pipeline welds. Background Art

[0002] Pressure pipelines are tubular devices used to transport gas or liquids under pressure. There are various ways to connect pressure pipelines, with welding being a common method. Pressure pipeline weld inspection is crucial for operational safety, and TOFD (Time of Flight Diffraction) is a common method used for weld inspection. TOFD is an advanced nondestructive testing technique, also known as "Time of Flight Ultrasonic Diffraction."

[0003] During inspection, the staff holds the TOFD detector by hand and moves up and down along the circumference of the pressure pipe. The two sets of roller assemblies on the TOFD detector will continuously rotate outside the pressure pipe. The two sets of probe assemblies of the TOFD detector will approach the two sides of the weld respectively, and the weld will be fully inspected as the TOFD detector moves.

[0004] Pressure pipelines may be laid in windy and sandy areas, and when inspecting their welds, the sand below the welds of the pressure pipelines will be hollowed out to facilitate complete inspection of the welds. However, windy and sandy areas are prone to wind, and with it comes drifting sand and dust, which easily adheres to the welds and probe components, thus affecting the accuracy of weld inspection. At the same time, the diameter of pressure pipelines laid in windy and sandy areas is generally relatively large, which makes it inconvenient and time-consuming to use the TOFD detector to scan the welds along its circumference in a complete upward and downward movement. At the same time, if manual data recording and marking are required during the inspection process, or if the inspection needs to be stopped to perform other related operations, the TOFD detector needs to be put down first, and then the TOFD detector needs to be re-placed outside the pressure pipeline to inspect the welds, which is also very troublesome to operate. Summary of the Invention

[0005] The object of the present invention is to provide a lifting and scanning device for TOFD inspection of pressure pipeline welds to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pressure pipeline weld TOFD detection lifting and scanning device, comprising a support rod, two groups of roller assemblies and two groups of probe assemblies installed on the support rod, the rollers of the two groups of roller assemblies are jointly attached to the top of the outer wall of the two pipe bodies, the front and rear edges of the upper ends of the support rod are provided with a positioning mechanism, the upper middle end of the support rod is fixedly connected to a top plate, the upper end of the top plate is slidably inserted with a baffle 1 near the two side edges, the upper end of the top plate is slidably inserted with a baffle 2 near the front and rear edges, the front ends of the two baffles 2 are provided with a square groove, the two square grooves are slidably matched with the support rod, the lower ends of the two baffles 1 and the two baffles 2 are fixedly connected with sponge blocks, the lower end surfaces of the four sponge blocks are close to the outer wall of the pipe body, and a fixing mechanism is provided between the top plate, the two baffles 1 and the two baffles 2.

[0007] Preferably, the positioning mechanism includes a fixed block, which is fixedly connected to the upper end of the support rod, and the upper end of the fixed block is elastically connected to a frame block through an elastic mechanism, and a concave block is fixedly connected to the lower edge of the side wall of the frame block, and a prying mechanism is provided between the concave block and the support rod, and a side wall of the fixed block is fixedly connected to a belt, and the belt is fitted on the outer wall of the corresponding tube body, and the end of the belt away from the fixed block passes through the frame block, and a plurality of screws are passed through the upper end of the frame block and tightened, and the bottom ends of the plurality of screws are tightly fitted with the outer surface of the belt.

[0008] Preferably, the elastic mechanism includes two cylindrical grooves, which are symmetrically opened at the upper end of the fixed block, and a fixed column is slidably inserted into the interior of the two cylindrical grooves. The bottom ends of the two fixed columns are respectively fixedly connected to the bottoms of the two cylindrical grooves with a spring three, and the top ends of the two fixed columns are fixedly connected to the lower end of the frame block.

[0009] Preferably, the prying mechanism includes an auxiliary column and two L-shaped blocks, the two L-shaped blocks are symmetrically fixedly connected to the upper end of the support rod near the fixed block, the side walls of the two L-shaped blocks are penetrated together and a rotating shaft is rotatably installed, the outer wall fixed sleeve of the rotating shaft is provided with a pressing column, the pressing column is rotatably connected to one end of the concave block with a sliding sleeve, the sliding sleeve is provided on the outer wall of the guide column, the guide column is fixedly connected between the two vertical walls of the concave block, the auxiliary column is fixedly connected to the end of the support rod corresponding to the pressing column, and a limiting mechanism is provided between the rotating shaft and one of the L-shaped blocks.

[0010] Preferably, the limiting mechanism includes a connecting column and a plurality of triangular grooves, the connecting column slides and is inserted into the upper end of the L-shaped block, the lower end of the connecting column is fixedly connected to a T-shaped block, the bottom end of the T-shaped block is in the shape of a right triangle, and a plurality of triangular grooves are arranged in a central annular array around the rotating shaft on the outer wall of the rotating shaft near the T-shaped block, the bottom end of the T-shaped block slides with one of the triangular grooves, and a spring 2 is fixedly connected between the T-shaped block and the L-shaped block, and the spring 2 is slidably sleeved on the outer wall of the connecting column.

[0011] Preferably, the fixing mechanism includes a square frame and a screw, the frame is fixedly connected to the upper edge of the top plate, the screw is rotatably connected to the middle of the upper end of the top plate, the wall surfaces of the two baffles 1 and the two baffles 2 away from the screw are respectively fitted with the inner four sides of the square frame at the upper end of the screw, the upper end of the screw is fixedly connected to a runner, a circular ring is threadedly sleeved on the outer wall of the screw, the outer wall of the circular ring is rotatably connected with four connecting rods, and the ends of the four connecting rods away from the circular ring are rotatably connected to the connecting plate, the four connecting plates are all slidably connected to the upper end of the top plate, and the four connecting plates are elastically connected with splints through an elastic mechanism, wherein two of the splints are respectively fitted with the wall surfaces corresponding to the two baffles 1, and the other two splints are respectively fitted with the wall surfaces corresponding to the two baffles 2.

[0012] Preferably, the elastic mechanism includes two splicing columns, which are symmetrically slidably inserted into the inner wall of the connecting plate, and one end of the two splicing columns is fixedly connected to the wall surface of the connecting plate corresponding to the splint, and a spring 1 is slidably sleeved on the outer wall of the two splicing columns, and the two springs 1 are fixedly connected between the splint and the connecting plate.

[0013] Preferably, a connecting column is fixedly connected between the top and bottom of the two square grooves, and the two connecting columns are slidably inserted into the inner wall of the support rod.

[0014] Preferably, shielding plates are symmetrically fixedly connected to the lower ends of the support rods, and the corresponding wall surfaces of the two shielding plates are respectively in contact with the distant wall surfaces of the two baffles.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Through the cooperation of the positioning mechanism, elastic mechanism, top plate, prying mechanism, limiting mechanism, baffle 1, baffle 2, square groove, sponge block and fixing mechanism, elastic mechanism and masking plate, this TOFD detector not only facilitates the staff to conduct complete weld inspection on pipes with larger diameters in sandy areas, but also, under the action of the top plate and four sponge blocks, the two sets of probe assemblies can be completely shielded for weld inspection to avoid contact with sand and dust, and the rotation of the sponge blocks corresponding to the welds can also clean the welds, thereby improving the accuracy of the inspection. At the same time, according to the deformability of the sponge blocks, it can also adapt to pipes of different diameters to completely block the two sets of probe assemblies and clean the welds, and has good applicability.

[0017] 2. If manual data recording and marking are required during the inspection process, or if the inspection needs to be stopped for other related operations, the TOFD detector can be easily and temporarily fixed to the pipe body. There is no need to put down the entire device first and then put the entire device back on the pipe body to inspect the weld. This is not only convenient to operate, but also ensures that the two sets of probe components are always protected from external sand and dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 A magnified view of the structure at center A;

[0020] Figure 3 It is a cross-sectional view of the top plate, the square frame, the second baffle plate and the concave block of the present invention;

[0021] Figure 4 For the present invention Figure 3 A magnified view of the structure at point B in the middle;

[0022] Figure 5 For the present invention Figure 4 A magnified view of the structure at point C in the middle;

[0023] Figure 6 is a cross-sectional view of a fixing block of the present invention;

[0024] Figure 7 A bottom view of the top plate of the present invention;

[0025] Figure 8 A top view of the top plate of the present invention;

[0026] Figure 9 This is a diagram showing the roller assembly, support rod and probe assembly of the present invention.

[0027] In the accompanying drawings, the list of parts represented by each number is as follows: 1. Shielding plate; 2. Top plate; 3. Sponge block; 4. Roller assembly; 5. Square frame; 6. Tube body; 7. Belt; 8. Connecting plate; 9. Support rod; 10. Clamp; 11. Connecting rod; 12. Rotating wheel; 13. Baffle 1; 14. Baffle 2; 15. Concave block; 16. Frame block; 17. Screw; 18. Fixed block; 19. Press column; 20. Auxiliary column; 21. L-shaped block; 22. Screw; 23. Probe assembly; 24. Splicing column; 25. Connecting column; 26. Sleeve; 27. Guide column; 28. Spring 1; 29. ​​T-shaped block; 30. Triangular groove; 31. Rotating shaft; 32. Spring 2; 33. Connecting column; 34. Spring 3; 35. Column groove; 36. Fixed column; 37. Square groove; 38. Ring. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution: Figure 1 - Figure 9 The shown pressure pipeline weld TOFD detection lifting and scanning device includes a support rod 9, two groups of roller assemblies 4 and two groups of probe assemblies 23 installed on the support rod 9, the rollers of the two groups of roller assemblies 4 are jointly attached to the top of the outer wall of the two tube bodies 6, and a positioning mechanism is provided at the front and rear edges of the upper end of the support rod 9. The middle part of the upper end of the support rod 9 is fixedly connected to a top plate 2, and the upper end of the top plate 2 is slidably inserted with a baffle 13 near the edges of both sides, and the upper end of the top plate 2 is slidably inserted with a baffle 2 14 near the front and rear edges. The front ends of the two baffles 14 are provided with square grooves 37, and the two square grooves 37 are slidably matched with the support rod 9. The lower ends of the two baffles 13 and the two baffles 14 are fixedly connected with sponge blocks 3, and the lower end faces of the four sponge blocks 3 are close to the outer wall of the tube body 6. A fixing mechanism is provided between the top plate 2, the two baffles 13 and the two baffles 14.

[0030] The positioning mechanism includes a fixed block 18, which is fixedly connected to the upper end of the support rod 9. The upper end of the fixed block 18 is elastically connected to the frame block 16 through an elastic mechanism. The lower edge of the side wall of the frame block 16 is fixedly connected to a concave block 15. A prying mechanism is provided between the concave block 15 and the support rod 9. One side wall of the fixed block 18 is fixedly connected to a belt 7. The belt 7 is fitted on the outer wall of the corresponding tube body 6. The end of the belt 7 away from the fixed block 18 passes through the frame block 16. A plurality of screws 17 are tightened through the upper end of the frame block 16. The bottom ends of the plurality of screws 17 are tightly fitted to the outer surface of the belt 7.

[0031] The elastic mechanism includes two cylindrical grooves 35, which are symmetrically opened at the upper end of the fixed block 18. A fixing column 36 is slidably inserted into the interior of the two cylindrical grooves 35. The bottom ends of the two fixing columns 36 are fixedly connected to the bottoms of the two cylindrical grooves 35 with springs 34 respectively. The top ends of the two fixing columns 36 are fixedly connected to the lower end of the frame block 16.

[0032] The prying mechanism includes an auxiliary column 20 and two L-shaped blocks 21. The two L-shaped blocks 21 are symmetrically fixedly connected to the upper end of the support rod 9 near the fixed block 18. The side walls of the two L-shaped blocks 21 are penetrated together and a rotating shaft 31 is rotatably installed. The outer wall of the rotating shaft 31 is fixedly sleeved with a pressing column 19. The pressing column 19 is rotatably connected to the end of the concave block 15 with a sliding sleeve 26. The sliding sleeve 26 is slidably sleeved on the outer wall of the guide column 27. The guide column 27 is fixedly connected between the two vertical walls of the concave block 15. The auxiliary column 20 is fixedly connected to the end of the support rod 9 corresponding to the pressing column 19. A limiting mechanism is provided between the rotating shaft 31 and one of the L-shaped blocks 21.

[0033] The limiting mechanism includes a connecting column 33 and a plurality of triangular grooves 30. The connecting column 33 slides and is inserted into the upper end of the L-shaped block 21. The lower end of the connecting column 33 is fixedly connected to the T-shaped block 29. The bottom end of the T-shaped block 29 is in the shape of a right triangle. A plurality of triangular grooves 30 are arranged in a central annular array around the rotating shaft 31 on the outer wall of the rotating shaft 31 near the T-shaped block 29. The bottom end of the T-shaped block 29 slides with one of the triangular grooves 30. A spring 2 32 is fixedly connected between the T-shaped block 29 and the L-shaped block 21. The spring 2 32 is slidably sleeved on the outer wall of the connecting column 33.

[0034] The fixing mechanism includes a square frame 5 and a screw 22. The square frame 5 is fixedly connected to the upper edge of the top plate 2, and the screw 22 is rotatably connected to the middle of the upper end of the top plate 2. The wall surfaces of the two baffles 13 and the two baffles 2 14 away from the screw 22 are respectively fitted with the inner four sides of the square frame 5. The upper end of the screw 22 is fixedly connected with a runner 12, and a circular ring 38 is threadedly sleeved on the outer wall of the screw 22. The outer wall of the circular ring 38 is rotatably connected with four connecting rods 11. The ends of the four connecting rods 11 away from the circular ring 38 are rotatably connected with a connecting plate 8. The four connecting plates 8 are all slidably connected to the upper end of the top plate 2. The four connecting plates 8 are elastically connected with a plywood 10 through an elastic mechanism, wherein two plywoods 10 are respectively fitted with the wall surfaces corresponding to the two baffles 13, and the other two plywoods 10 are respectively fitted with the wall surfaces corresponding to the two baffles 2 14.

[0035] The elastic mechanism includes two splicing columns 24, which are symmetrically slidably inserted into the inner wall of the connecting plate 8. One end of the two splicing columns 24 is fixedly connected to the wall surface of the connecting plate 8 corresponding to the splint 10. A spring 28 is slidably sleeved on the outer wall of the two splicing columns 24, and the two springs 28 are fixedly connected between the splint 10 and the connecting plate 8.

[0036] A connecting column 25 is fixedly connected between the top and bottom of the two square grooves 37 , and the two connecting columns 25 are slidably inserted into the inner wall of the support rod 9 .

[0037] Specifically, by providing the connecting column 25 , the stability between the second baffle 14 and the top plate 2 is improved.

[0038] The lower end of the support rod 9 is symmetrically fixedly connected with the shielding plates 1, and the corresponding wall surfaces of the two shielding plates 1 are respectively in contact with the wall surfaces of the two baffles 14 that are away from each other.

[0039] Specifically, under the action of the shielding plate 1, when the baffle 2 14 moves downward, its square groove 37 will also move downward. In order to prevent the square groove 37 and the support rod 9 from forming a gap to allow sand and dust to enter, the shielding plate 1 can block the gap between the square groove 37 and the support rod 9 at this time.

[0040] Working principle: When the TOFD detector needs to be placed on a pipe 6 (the pipe 6 is a pressure pipe) laid in a sandy area for weld detection, first place two sets of roller assemblies 4 on the top of the two pipes 6, and make the two sets of probe assemblies 23 close to both sides of the weld. Then one staff member holds the support rod 9 firmly, and another staff member wraps a belt 7 around and fits it along the outer wall of a pipe 6, and passes the belt 7 through the corresponding frame block 16, and keeps the tightness between the belt 7 and the pipe 6 moderate. Then, turn down multiple screws 17 in turn so that the bottom ends of the multiple screws 17 press the belt 7. At this time, one belt 7 can be fixed, and the other belt 7 is fixed in the same way.

[0041] Before the above, rotate the wheel 12 in advance, the wheel 12 will drive the screw 22 to rotate, the screw 22 will drive the ring 38 to move downward, the ring 38 will drive the four connecting rods 11 to rotate accordingly, and the four connecting rods 11 will drive the connecting plates 8 connected to them to slide away from the screw 22 at the upper end of the top plate 2 (it should be noted that the sliding connection between the connecting plate 8 and the top plate 2 can be the mutual cooperation of the T-shaped slider and the T-shaped slot, that is, the T-shaped slider is connected to the lower end of the connecting plate 8, and the T-shaped slot is opened at the upper end of the top plate 2). The plate 8 will move together with the connected splicing plates 10 through the two splicing columns 24 and two springs 1 28 connected to each other. The four splicing plates 10 will squeeze the two baffles 1 13 and the two baffles 2 14 respectively, and each connecting plate 8 will slide outside the two corresponding splicing columns 24 and slightly squeeze the two springs 1 28. At this time, there is a certain friction between the two baffles 1 13, the two baffles 2 14 and the corresponding splicing plates 10, so the two baffles 1 13 and the two baffles 2 14 will not automatically slide down in the top plate 2.

[0042] Then, push the two baffles 13 and the two baffles 2 14 downward in turn, and the sponge blocks 3 under each baffle 1 13 and baffle 2 14 will squeeze the corresponding outer wall of the tube body 6, and will undergo different degrees of contraction deformation in the vertical direction (it should be noted that the sponge blocks 3 have a low density and a loose structure, and are not easy to bend in other directions under unidirectional pressure), until the four sponge blocks 3 seal the four sides of the two sets of probe assemblies 23, and finally continue to rotate the rotating wheel 12 so that the four splints 10 further squeeze the two baffles 1 13 and the two baffles 2 14 respectively, then the spring 1 28 will be compressed to the limit, and under the action of the larger extrusion force, the two baffles 13 and the two baffles 2 14 will be fixed. Finally, rotate the support rod 9 to drive the two sets of roller assemblies 4 to rotate on the tube body 6. The two sets of probe assemblies 23 will move along the weld. The two sets of probe assemblies 23 will move up and down along the circumferential surface of the tube body 6 to scan. The two belts 7 will always be put on the outside of the corresponding tube body 6 and rotate in close proximity to it, thereby detecting the weld.

[0043] When the entire device needs to pass through the bottom of the pipe body 6, under the action of the two belts 7 that restrict the movement of the support rod 9, the two groups of roller assemblies 4 and the two groups of probe assemblies 23 outside the pipe body 6, the two groups of probe assemblies 23 can be easily operated to pass through the bottom of the pipe body 6. Then the staff can come to the other side of the pipe body 6 and take over the support rod 9 and continue to rotate the support rod 9. The entire device will not fall during the process, which makes it convenient for the staff to conduct complete weld inspection on the pipe body 6 with a larger diameter in a sandy area. Secondly, under the action of the top plate 2 and the four sponge blocks 3, the two groups of probe assemblies 23 can be completely blocked to avoid contact with sand and dust, and the rotation of the sponge blocks 3 corresponding to the welds can also clean the welds, thereby improving the accuracy of the inspection. At the same time, according to the deformability of the sponge blocks 3, it can also adapt to pipes 6 of different diameters to completely block the two groups of probe assemblies 23 and clean the welds, and has good applicability.

[0044] If manual data recording and marking is required during the inspection process, or if the inspection needs to be stopped to perform other related operations, first hold the adjacent pressing column 19 and the auxiliary column 20, and rotate the bottom end of the pressing column 19 toward the auxiliary column 20. The pressing column 19 will drive the rotating shaft 31 to rotate in the two L-shaped blocks 21, and the pressing column 19 will also drive the sliding sleeve 26 to move upward, and the sliding sleeve 26 will drive the guide column 27 to move upward, and the sliding sleeve 26 will also slide in the corresponding direction outside the guide column 27. The guide column 27 will drive the concave block 15 to move upward, the concave block 15 will drive the frame block 16 to move upward, and the frame block 16 will drive the two fixed columns 36 to rotate in the corresponding column slots 3. 5 slides upward and stretches the spring three 34, the frame block 16 will drive one belt 7 to be more tightly attached to the outside of the corresponding tube body 6, and the other belt 7 will also be more tightly attached to the outside of the corresponding tube body 6. Then, under the friction between the belt 7 and the tube body 6, after loosening the support rod 9, the belt 7, the roller assembly 4 and the probe assembly 23 will not rotate, and the support rod 9, the two groups of roller assemblies 4 and the two groups of probe assemblies 23 can be temporarily fixed. There is no need to put down the entire device first and then put the entire device back on the outside of the tube body 6 for weld inspection. It is not only convenient to operate, but also ensures that the two groups of probe assemblies 23 will not come into contact with external sand and dust at all times.

[0045] It should be noted that the rotating shaft 31 will drive the multiple triangular slots 30 to rotate during the rotation process. The triangular slot 30 originally matched with the triangular end of the T-shaped block 29 will push the inclined surface of the triangular end of the T-shaped block 29, so that the T-shaped block 29 is squeezed and moves upward. The T-shaped block 29 will drive the connecting column 33 to slide upward in the corresponding L-shaped block 21, and the T-shaped block 29 will squeeze the spring 2 32 connected to the L-shaped block 21. When the next triangular slot 30 corresponds to the triangular end of the T-shaped block 29, under the action of the spring 2 32, the triangular end of the T-shaped block 29 will automatically insert into the triangular slot 30, and so on. At the same time, after the rotating shaft 31 rotates, combined with Figure 5From the perspective of the embodiment, the vertical surface of the corresponding triangular groove 30 is in contact with the vertical surface of the triangular end of the T-shaped block 29, so the rotating shaft 31 will not rotate back. Therefore, the pressing column 19 can be released after rotating it. When the angle of the pressing column 19 is restored, the connecting column 33 can be lifted up. The connecting column 33 will drive the triangular end of the T-shaped block 29 to leave the corresponding triangular groove 30. At this time, under the action of the spring three 34, the frame block 16, the concave block 15, the guide column 27 and the sliding sleeve 26 will automatically move downward and drive the pressing column 19 to rotate back.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lifting scanning device for TOFD inspection of pressure pipe welds, comprising a support rod (9), two sets of roller assemblies (4) mounted on the support rod (9) and two sets of probe assemblies (23), wherein the rollers of the two sets of roller assemblies (4) are attached to the top of the outer walls of two pipe bodies (6), and characterized in that: The front and rear edges of the upper end of the support rod (9) are both provided with positioning mechanisms, the middle part of the upper end of the support rod (9) is fixedly connected to a top plate (2), the upper end of the top plate (2) is slidably inserted with a baffle plate 1 (13) near the edges of both sides, the upper end of the top plate (2) is slidably inserted with a baffle plate 2 (14) near the front and rear edges, the front ends of the two baffle plates 2 (14) are both provided with square grooves (37), the two square grooves (37) are both slidably matched with the support rod (9), the lower ends of the two baffle plates 1 (13) and the two baffle plates 2 (14) are both fixedly connected to sponge blocks (3), the lower end surfaces of the four sponge blocks (3) are all close to the outer wall of the tube body (6), and a fixing mechanism is provided between the top plate (2), the two baffle plates 1 (13) and the two baffle plates 2 (14); The positioning mechanism includes a fixed block (18), the fixed block (18) is fixedly connected to the upper end of the support rod (9), the upper end of the fixed block (18) is elastically connected to the frame block (16) through an elastic mechanism, the lower edge of the side wall of the frame block (16) is fixedly connected to a concave block (15), a prying mechanism is provided between the concave block (15) and the support rod (9), a side wall of the fixed block (18) is fixedly connected to a belt (7), the belt (7) is fitted on the outer wall of the corresponding tube (6), the end of the belt (7) away from the fixed block (18) passes through the frame block (16), the upper end of the frame block (16) is penetrated and tightened with a plurality of screws (17), and the bottom ends of the plurality of screws (17) are tightly fitted with the outer surface of the belt (7); The elastic mechanism includes two cylindrical grooves (35), the two cylindrical grooves (35) are symmetrically opened at the upper end of the fixed block (18), and the interiors of the two cylindrical grooves (35) are slidably inserted with fixed columns (36), the bottom ends of the two fixed columns (36) are respectively fixedly connected to the bottoms of the two cylindrical grooves (35) with springs three (34), and the top ends of the two fixed columns (36) are fixedly connected to the lower end of the frame block (16); The prying mechanism includes an auxiliary column (20) and two L-shaped blocks (21), the two L-shaped blocks (21) are symmetrically fixedly connected to the upper end of the support rod (9) near the fixed block (18), the side walls of the two L-shaped blocks (21) are penetrated by a rotating shaft (31), the outer wall fixed sleeve of the rotating shaft (31) is provided with a pressing column (19), the pressing column (19) is rotatably connected to one end of the concave block (15), the sliding sleeve (26) is slidably sleeved on the outer wall of the guide column (27), the guide column (27) is fixedly connected between two vertical walls of the concave block (15), the auxiliary column (20) is fixedly connected to the end of the support rod (9) corresponding to the pressing column (19), and a limiting mechanism is provided between the rotating shaft (31) and one of the L-shaped blocks (21); The limiting mechanism includes a connecting column (33) and a plurality of triangular grooves (30), wherein the connecting column (33) is slidably inserted into the upper end of the L-shaped block (21), and the lower end of the connecting column (33) is fixedly connected to a T-shaped block (29), and the bottom end of the T-shaped block (29) is in the shape of a right triangle. The plurality of triangular grooves (30) are arranged in a central annular array around the rotating shaft (31) and are opened on the outer wall of the rotating shaft (31) near the T-shaped block (29). The bottom end of the T-shaped block (29) is slidably matched with one of the triangular grooves (30), and a second spring (32) is fixedly connected between the T-shaped block (29) and the L-shaped block (21), and the second spring (32) is slidably sleeved on the outer wall of the connecting column (33).

2. The lifting and scanning device for TOFD inspection of pressure pipeline welds according to claim 1, characterized in that: The fixing mechanism includes a square frame (5) and a screw (22), wherein the square frame (5) is fixedly connected to the upper edge of the top plate (2), and the screw (22) is rotatably connected to the middle of the upper end of the top plate (2). The walls of the two baffles (13) and the two baffles (14) away from the screw (22) are respectively fitted with the inner four sides of the square frame (5). The upper end of the screw (22) is fixedly connected to the wheel (12), and a ring (38) is threadedly sleeved on the outer wall of the screw (22). The ring (38) The outer wall is rotatably connected to four connecting rods (11), and one end of the four connecting rods (11) away from the ring (38) is rotatably connected to a connecting plate (8). The four connecting plates (8) are slidably connected to the upper end of the top plate (2). The four connecting plates (8) are elastically connected to a clamping plate (10) through an elastic mechanism, wherein two of the clamping plates (10) are respectively fitted with the wall surfaces corresponding to the two baffles (13), and the other two clamping plates (10) are respectively fitted with the wall surfaces corresponding to the two baffles (14).

3. The lifting and scanning device for TOFD inspection of pressure pipeline welds according to claim 2, characterized in that: The elastic mechanism includes two splicing columns (24), the two splicing columns (24) are symmetrically slidably inserted into the inner wall of the connecting plate (8), one end of the two splicing columns (24) is fixedly connected to the wall surface of the connecting plate (8) corresponding to the splint (10), and a spring (28) is slidably sleeved on the outer wall of the two splicing columns (24), and the two springs (28) are fixedly connected between the splint (10) and the connecting plate (8).

4. The lifting and scanning device for TOFD inspection of pressure pipeline welds according to claim 1, characterized in that: A connecting column (25) is fixedly connected between the top and bottom of the two square grooves (37), and the two connecting columns (25) are slidably inserted into the inner wall of the support rod (9).

5. The lifting and scanning device for TOFD inspection of pressure pipeline welds according to claim 1, characterized in that: The lower end of the support rod (9) is symmetrically fixedly connected to a shielding plate (1), and the corresponding wall surfaces of the two shielding plates (1) are respectively fitted with the wall surfaces of the two baffles (14) that are away from each other.

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