A device for nondestructive testing of pipeline structure

Abstract

The present invention discloses a device for nondestructive testing of pipeline structures, including a flexible skeleton and a wheel frame, an axial excitation subunit and a circumferential probe subunit detachably connected thereto, wherein the flexible skeleton includes a support unit section, an organ pipe, a spring A, a pressure ring A, a pressure ring B and a connecting column. The present invention mainly provides a flexible bracket, which makes the device more flexible when performing motion detection in a pipeline, that is, it can be more flexibly deformed in the face of a curved part, thereby increasing the number of devices installed on the entire flexible skeleton, while reducing the size of the entire device with a high degree of integration, making the entire device more compact and flexible, and relatively reducing the energy consumed by the operation of the device.

Description

Technical Field

[0001] The invention relates to a pipeline detection device, in particular to a device for nondestructive detection of pipeline structures. Background Art

[0002] Nondestructive testing of large pipelines (such as oil and gas pipelines) can ensure transportation safety. It mainly uses axial excitation detection technology. The axial excitation corrosion detector includes two excitation units arranged in sequence along the axial direction of the pipeline, and multiple probes distributed along the inner wall of the pipeline between the two excitation units. The inner wall of the pipeline is saturated magnetized by the excitation unit, and a magnetic circuit along the axial direction of the pipeline is formed in the measured pipe wall. When there is no defect in the pipe wall, the magnetic lines of force are within the pipe wall. When there is a defect in the pipe wall, the magnetic lines of force will pass through the pipe wall to form a leakage magnetic field, and the leaked magnetic field will be detected by the probe. At present, the construction of pipelines on land is relatively convenient. Generally, the pipelines extend straight and have fewer bending positions. Traditional monitoring devices can complete the task well. For pipelines laid on the seabed, they are affected by many factors (ocean currents or submarine earthquakes, etc.), which makes the pipelines on the seabed bend. In order to avoid blockage or extrusion damage, traditional monitoring devices generally separate multiple axial monitoring and circumferential monitoring devices and connect them with chains or other connectors. The monitoring device will be very long and consume more energy during movement. Summary of the invention

[0003] The object of the present invention is to provide a device for nondestructive testing of pipeline structures to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A device for non-destructive testing of pipeline structures of the present invention comprises a flexible skeleton and a wheel frame, an axial excitation subunit and a circumferential probe subunit detachably connected thereto, the flexible skeleton comprises a support unit section, an organ pipe, a spring A, a pressure ring A, a pressure ring B and a connecting column, wherein there are multiple support unit sections and other components, each support unit section is cylindrical and a connecting column coaxial therewith is arranged in the middle, the connecting column is fixed in the support unit section by an annular plate, and adjacent support unit sections are connected by a steering knuckle structure; the steering knuckle structure comprises a C-shaped bracket, a connecting piece and a swing arm, wherein the connecting piece is a cylinder and a through groove extending inwardly along its axial direction is provided on the surface, one end of the swing arm is rotatably connected in the through groove by a bearing and a pin shaft, and shafts are integrally formed at both ends of the connecting piece and the shafts rotate through the bearings The circular holes opened at both ends of the C-shaped bracket are connected, and the middle part of the connecting piece is connected to the end of a connecting column, and the other end of the swing arm is correspondingly connected to the end of another connecting column; that is, through the movement of the C-shaped bracket and the swing arm at two angles; a sealing structure is arranged between two adjacent support unit sections, and the sealing mechanism includes an organ pipe, a spring A, a pressure ring A and a pressure ring B, and the pressure ring A and the pressure ring B are two groups and are respectively located at the two ends of the organ pipe, and the pressure ring A and the pressure ring B are fixedly connected by bolts, and the end edge of the organ pipe is pressed between the pressure ring A and the pressure ring B, and the interior of the organ pipe is still provided with a spring A, and the two ends of the spring A are pressed on the pressure ring A located on the inner side, and the spring A presses the pressure rings B at its two ends to the surface of the annular plate welded in the corresponding support unit section, and the spring A is in a pre-tightened state in the flexible skeleton, and the elastic force can keep the flexible skeleton tightened.

[0005] As a further solution of the present invention: the connecting column is rotatably mounted to the middle part of the corresponding supporting unit section through a bearing.

[0006] As a further solution of the present invention: the outer diameter of the pressure ring A is smaller than the outer diameter of the pressure ring B, the inner diameter of the pressure ring A is equal to the inner diameter of the pressure ring B, the outer diameter of the pressure ring B is equal to the inner diameter of the support unit section, and the pressure ring A is located inside the organ pipe. By reducing the outer diameter of the pressure ring A, the pressure ring A on the surface of the organ pipe can be prevented from being squeezed and rubbed against the inner wall of the support unit section, thereby achieving a better protective effect.

[0007] As a further solution of the present invention: the axial excitation subunit includes an annular cover plate, an axial magnet, an axial probe subunit, a probe bracket, a fixed sleeve, a ferromagnetic metal sleeve and an inner sleeve, a fixed sleeve coaxial therewith is arranged on the outside of the inner sleeve, both ends of the inner sleeve and both ends of the fixed sleeve are fixedly connected with an annular cover plate by bolts, rubber pads can be added between the two ends of the inner sleeve and the two ends of the fixed sleeve and the annular cover plate to achieve sealing, and electronic equipment can be installed in the space between the inner sleeve and the fixed sleeve, a ferromagnetic metal sleeve coaxial therewith is arranged between the inner sleeve and the fixed sleeve, the probe bracket is fixedly connected to the probe bracket around its axis at the middle position of the surface of the fixed sleeve, a plurality of axial probe subunits are fixedly connected to the probe bracket, and a plurality of axial magnets are fixedly connected to the surface of the fixed sleeve through holes at positions on both sides of the probe bracket, and the magnetic poles of the axial magnets on both sides of the probe bracket are arranged opposite to each other.

[0008] As a further solution of the present invention: the circumferential excitation subunit includes an annular cover plate, a circumferential magnet, a circumferential probe subunit, a probe bracket, a fixed sleeve, a ferromagnetic metal sleeve and an inner sleeve, a fixed sleeve coaxial with the inner sleeve is arranged on the outside of the inner sleeve, both ends of the inner sleeve and both ends of the fixed sleeve are fixedly connected with an annular cover plate by bolts, rubber pads can be added between the two ends of the inner sleeve and the two ends of the fixed sleeve and the annular cover plate to achieve sealing, and electronic equipment can be installed in the space between the inner sleeve and the fixed sleeve, and a ferromagnetic metal sleeve coaxial with the inner sleeve and the fixed sleeve is arranged between the inner sleeve and the fixed sleeve; the surface of the fixed sleeve of the circumferential excitation subunit is fixedly connected with a plurality of probe brackets distributed around its axis, a circumferential magnet is arranged between two adjacent probe brackets on the circumferential excitation subunit, and the magnetic poles of the two groups of circumferential magnets on both sides of the probe bracket are arranged oppositely; the circumferential excitation subunits are generally two groups, and the probe brackets on the two groups of circumferential excitation subunits are arranged crosswise.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention mainly provides a flexible bracket, which makes the device more flexible when detecting motion in a pipeline, that is, it can deform more flexibly when facing the curved part, thereby increasing the number of devices installed on the entire flexible skeleton, and reducing the size of the entire device while having a high degree of integration, which can make the entire device more compact and flexible, and relatively reduce the energy consumed in the operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a device for nondestructive testing of pipeline structures.

[0011] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0012] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0013] Figure 4 It is a schematic diagram of the structure between the supporting unit sections in the device for non-destructive testing of pipeline structures.

[0014] Figure 5 This is a structural schematic diagram of the wheel frame installation in the device for non-destructive testing of pipeline structures. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0016] See also Figures 1 to 5 In an embodiment of the present invention, a device for nondestructive testing of pipeline structure includes a flexible skeleton and a wheel frame 2, an axial excitation subunit and a circumferential probe subunit detachably connected thereto, wherein the flexible skeleton includes a support unit section 9, an organ pipe 13, a spring A14, a pressure ring A15, a pressure ring B16 and a connecting column 33, wherein the support unit section 9 and other components are multiple, each support unit section 9 is cylindrical and has a connecting column 33 coaxial therewith in the middle, the connecting column 33 is fixed in the support unit section 9 by an annular plate, and adjacent support unit sections 9 are connected by a steering knuckle structure; the steering knuckle structure includes a C-shaped bracket 17, a connecting piece 18 and a swing The arm 19, wherein the connecting piece 18 is a cylinder and a through groove extending inwardly along its axial direction is provided on the surface. One end of the swing arm 19 is rotatably connected to the through groove through a bearing and a pin shaft. The two ends of the connecting piece 18 are integrally formed with a shaft and the shaft is rotatably connected to the circular holes provided at the two ends of the C-shaped bracket 17 through a bearing. The middle part of the connecting piece 18 is connected to the end of a connecting column 33, and the other end of the swing arm 19 is correspondingly connected to the end of another connecting column 33; that is, through the movement of the C-shaped bracket 17 and the swing arm 19 at two angles, the entire flexible skeleton has a good deformation ability, which meets the demand that more equipment in a pipeline with a certain curvature can be detachably installed on the flexible skeleton;

[0017] Furthermore, the connecting column 33 can be rotatably mounted to the middle of the corresponding supporting unit section 9 through a bearing to increase the degree of freedom of the entire flexible skeleton.

[0018] A support unit section 9 at the end of the flexible skeleton is fixedly connected to one end of a cylindrical mounting seat 11, and the other end of the mounting seat 11 is threadedly connected to a cylindrical head component 10. A resistance plate 11 is clamped and installed between the head component 10 and the mounting seat 11. The resistance plate is used to cooperate with the movement of liquid or gas in the pipeline to drive the entire device to move in the pipeline.

[0019] A sealing structure is arranged between two adjacent support unit sections 9, and the sealing mechanism includes an organ pipe 13, a spring A14, a pressure ring A15 and a pressure ring B16. The pressure ring A15 and the pressure ring B16 are in two groups and are respectively located at the two ends of the organ pipe 13. The pressure ring A15 and the pressure ring B16 are fixedly connected by bolts, and the end edge of the organ pipe 13 is pressed between the pressure ring A15 and the pressure ring B16. The interior of the organ pipe 13 is still provided with a spring A14, and the two ends of the spring A14 are pressed on the pressure ring A15 located on the inner side, and the spring A14 presses the pressure rings B16 at its two ends on the surface of the annular plate welded in the corresponding support unit section 9. The spring A14 is in a pre-tightened state in the flexible skeleton, and the elastic force can keep the flexible skeleton tightened. The elastic force and the bending characteristics of the spring are utilized to enable the flexible skeleton to be reset and have a supporting effect. The elastic force coefficient of the spring can be selected according to the weight of the equipment installed on the flexible skeleton.

[0020] The outer diameter of the pressure ring A15 is smaller than the outer diameter of the pressure ring B16, the inner diameter of the pressure ring A15 is equal to the inner diameter of the pressure ring B16, the outer diameter of the pressure ring B16 is equal to the inner diameter of the support unit segment 9, and the pressure ring A15 is located inside the organ pipe 13. By reducing the outer diameter of the pressure ring A15, the pressure ring A15 can be prevented from being squeezed and rubbed against the inner wall of the support unit segment 9 on the surface of the organ pipe 13, thereby achieving a better protective effect.

[0021] The outer surface of the support unit section 9 is provided with a plurality of “T” shaped slide rails equidistantly distributed around its axis, and the “T” shaped slide rails are used to cooperate and connect with the corresponding slide grooves of the wheel frame 2, the axial excitation subunit and the circumferential probe subunit.

[0022] The axial excitation subunit includes an annular cover plate 3, an axial magnet 4, an axial probe subunit 5, a probe bracket 6, a fixed sleeve 23, a ferromagnetic metal sleeve 24 and an inner sleeve 32. The inner sleeve 32 is provided with a coaxial fixed sleeve 23 on the outside. Both ends of the inner sleeve 32 and both ends of the fixed sleeve 23 are fixedly connected with the annular cover plate 3 by bolts. Rubber pads can be added between the two ends of the inner sleeve 32 and the two ends of the fixed sleeve 23 and the annular cover plate 3 to achieve sealing. Electronic equipment can be installed in the space between the inner sleeve 32 and the fixed sleeve 23. A coaxial fixed sleeve 23 is provided between the inner sleeve 32 and the fixed sleeve 23. A ferromagnetic metal sleeve 24 is provided, and a probe bracket 6 is fixedly connected to the middle position of the surface of the fixed sleeve 23 around its axis. A plurality of axial probe sub-units 5 are fixedly connected to the probe bracket 6. The data lines of the axial probe sub-units 5 can be connected to the inlet and outlet holes opened on the surface of the annular cover plate 3 by bending the metal conduit, and rubber sealing plugs are provided at both ends of the metal conduit to ensure the sealing effect. The surface of the fixed sleeve 23 is located at the positions on both sides of the probe bracket 6, and the through holes are inserted into the through holes for fixed connection (epoxy resin glue can be used for bonding and sealing). The magnetic poles of the axial magnets 4 on both sides of the probe bracket 6 are arranged opposite to each other.

[0023] The circumferential excitation subunit includes an annular cover plate 3, a circumferential magnet 7, a circumferential probe subunit 8, a probe bracket 6, a fixed sleeve 23, a ferromagnetic metal sleeve 24 and an inner sleeve 32. The inner sleeve 32 is provided with a fixed sleeve 23 coaxial therewith on the outside. Both ends of the inner sleeve 32 and both ends of the fixed sleeve 23 are fixedly connected with the annular cover plate 3 by bolts. Rubber pads can be added between the two ends of the inner sleeve 32 and the two ends of the fixed sleeve 23 and the annular cover plate 3 to achieve sealing, and the inner sleeve 32 and the fixed sleeve 23 are sealed. Electronic equipment can be installed in the space, and a ferromagnetic metal sleeve 24 coaxial with the inner sleeve 32 and the fixed sleeve 23 is arranged between them; the surface of the fixed sleeve 23 of the circumferential excitation subunit is fixedly connected to a plurality of probe brackets 6 distributed around its axis, and a circumferential magnet 7 is arranged between two adjacent probe brackets 6 on the circumferential excitation subunit, and the magnetic poles of the two groups of circumferential magnets 7 on both sides of the probe bracket 6 are arranged in opposite directions; the circumferential excitation subunits are generally two groups, and the probe brackets 6 on the two groups of circumferential excitation subunits are arranged crosswise.

[0024] The space between the annular cover plate 3 , the inner sleeve 32 and the fixed sleeve 23 can be used to install electronic equipment and batteries for collecting information of the circumferential probe subunit 8 and the axial probe subunit 5 .

[0025] In the actual manufacturing process, the length of the axial excitation subunit is greater than the length of the circumferential excitation subunit.

[0026] The inner walls of the inner sleeve 32 of the circumferential excitation subunit and the inner sleeve 32 of the axial excitation subunit are provided with sliding grooves that cooperate with the "T"-shaped sliding rail, and the inner sleeve 32 of the circumferential excitation subunit and the inner sleeve 32 of the axial excitation subunit are fixedly connected to the corresponding support unit section 9 through a locking structure B. The locking structure B includes a hexagonal metal block 25, an internal threaded sleeve 26, a screw 27, a wedge block A28, a wedge block B29, a spring B30 and a latch A31. The internal threaded sleeve 26 is welded to the inner sleeve 32 through a metal bracket, and the axis of the internal threaded sleeve 26 is parallel to the axis of the inner sleeve 32. The inner sleeve 32 is internally threaded with a screw 27, one end of the screw 27 is welded to the end of the hexagonal metal block 25 outside the annular cover plate 3, and the other end of the screw 27 is rotatably connected to the wedge block through a bearing. In the installation groove opened on the side of A28, the inclined surface of the wedge block A28 contacts the inclined surface of the wedge block B29 and can slide against each other. A pin A31 perpendicular to the axis is fixedly connected to the surface of the wedge block B29 opposite to its inclined surface. The corresponding inner sleeve 32 opens a through hole for the pin A31 to pass through, and the corresponding support unit section 9 is provided with a slot for the end of the pin A31 to be inserted. A spring B30 is provided between the wedge block B2 and the inner sleeve 32, that is, the wedge block A28 is moved back and forth by rotating the hexagonal metal block 25 with a wrench, so that the pin A31 can perform telescopic movement to achieve locking and unlocking; a rubber ring is provided at the connection position between the screw 27 and the corresponding annular cover plate 3 to achieve a sealing effect. The rubber ring can be bonded to the annular cover plate 3 so that the screw can rotate in and out.

[0027] The wheel frame 2 is a Y-shaped metal part. The two ends of the wheel frame 2 are connected to the wheel axle by bearings, and the other end of the wheel frame 2 is provided with a groove that is slidably connected to the "T"-shaped slide rail of the support unit section 9. The wheel frame 2 is fixedly connected to the support unit section 9 by a locking structure A. The locking structure A includes a spring C20, a latch B21 and a lever 22, wherein the latch B21 is slidably connected to the latch slot provided at the other end of the wheel frame 2, and a spring C20 is arranged between the end of the latch B21 and the inner end of the latch slot. The outer surface of the wheel frame 2 is provided with a lever slot connected to its latch slot, and the lever 22 is slidably connected in the lever slot. One end of the lever 22 is threadedly connected to the surface of the latch B21, and the spring C inserts the latch B21 into the corresponding slot on the support unit section 9. During the working process, the wheel frame is manually selected according to the inner diameter of the pipeline to be tested to ensure that the entire device can be supported by the wheel frame on the inner wall of the pipeline.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for nondestructive testing of pipeline structures, comprising a flexible skeleton and a wheel frame (2) detachably connected thereto, an axial excitation subunit and a circumferential excitation subunit, characterized in that: The flexible skeleton comprises a support unit section (9), an organ pipe (13), a spring A (14), a pressure ring A (15), a pressure ring B (16) and a connecting column (33), wherein there are a plurality of support unit sections (9), each support unit section (9) is cylindrical and a connecting column (33) coaxial therewith is arranged in the middle, the connecting column (33) is fixed in the support unit section (9) through an annular plate, and adjacent support unit sections (9) are connected through a steering knuckle structure; the steering knuckle structure comprises a C-shaped bracket (17), a connecting piece (18) and a swing arm (19), wherein the connecting piece (18) is a cylinder and a through groove extending inwardly along its axial direction is provided on the surface, and one end of the swing arm (19) is rotatably connected in the through groove through a bearing and a pin shaft, and shafts are integrally formed at both ends of the connecting piece (18) and the shafts are rotatably connected to the circular holes provided at both ends of the C-shaped bracket (17) through bearings, the middle of the connecting piece (18) is connected to the end of a connecting column (33), and the swing arm (19) is connected to the swing arm (19) through a bearing. 9) is connected to the end of another connecting column (33); that is, through the movement of the C-shaped bracket (17) and the swing arm (19) at two angles; a sealing structure is arranged between two adjacent supporting unit sections (9), and the sealing mechanism includes an organ pipe (13), a spring A (14), a pressure ring A (15) and a pressure ring B (16), and the pressure ring A (15) and the pressure ring B (16) are two groups and are respectively located at the two ends of the organ pipe (13), and the pressure ring A (15) and the pressure ring B (16) are arranged in two groups. B (16) is fixedly connected by bolts, and the pressure ring A (15) and the pressure ring B (16) are used to press the end edge of the organ pipe (13). The interior of the organ pipe (13) is also provided with a spring A (14). The two ends of the spring A (14) are pressed on the pressure ring A (15) located on the inner side, and the spring A (14) presses the pressure rings B (16) at both ends thereof on the surface of the annular plate welded in the corresponding support unit section (9). The spring A (14) is in a pre-tightened state in the flexible skeleton.

2. The device for nondestructive testing of pipeline structure according to claim 1, characterized in that: The connecting column (33) is rotatably mounted to the middle of the corresponding supporting unit section (9) via a bearing.

3. The device for nondestructive testing of pipeline structure according to claim 1 or 2, characterized in that: The outer diameter of the pressure ring A (15) is smaller than the outer diameter of the pressure ring B (16), the inner diameter of the pressure ring A (15) is equal to the inner diameter of the pressure ring B (16), the outer diameter of the pressure ring B (16) is equal to the inner diameter of the support unit section (9), and the pressure ring A (15) is located in the organ pipe (13).

4. The device for nondestructive testing of pipeline structures according to claim 1, 2 or 3, characterized in that: The outer surface of the support unit section (9) has a plurality of "T"-shaped slide rails distributed at equal distances around its axis, and the "T"-shaped slide rails are used to cooperate with and connect with the corresponding slide grooves of the wheel frame (2), the axial excitation subunit and the circumferential excitation subunit.

5. The device for nondestructive testing of pipeline structure according to claim 3, characterized in that: The axial excitation subunit comprises an annular cover plate (3), an axial magnet (4), an axial probe subunit (5), a probe bracket (6), a fixed sleeve (23), a ferromagnetic metal sleeve (24) and an inner sleeve (32); a fixed sleeve (23) coaxial with the inner sleeve (32) is arranged outside the inner sleeve (32); both ends of the inner sleeve (32) and both ends of the fixed sleeve (23) are fixedly connected to the annular cover plate (3) by bolts; rubber pads are added between the two ends of the inner sleeve (32) and the two ends of the fixed sleeve (23) and the annular cover plate (3) to achieve sealing; and the inner sleeve (32) An electronic device is installed in the space between the inner sleeve (32) and the fixed sleeve (23); a ferromagnetic metal sleeve (24) coaxial with the fixed sleeve (23) is arranged between the inner sleeve (32) and the fixed sleeve (23); a probe bracket (6) is fixedly connected to the middle position of the surface of the fixed sleeve (23) around its axis; a plurality of axial probe subunits (5) are fixedly connected to the probe bracket (6); and a plurality of axial magnets (4) are inserted and fixedly connected through holes at positions on both sides of the probe bracket (6) on the surface of the fixed sleeve (23); and the magnetic poles of the axial magnets (4) on both sides of the probe bracket (6) are arranged opposite to each other.

6. The device for nondestructive testing of pipeline structure according to claim 5, characterized in that: The circumferential excitation subunit comprises an annular cover plate (3), a circumferential magnet (7), a circumferential probe subunit (8), a probe bracket (6), a fixed sleeve (23), a ferromagnetic metal sleeve (24) and an inner sleeve (32); a fixed sleeve (23) coaxial with the inner sleeve (32) is arranged outside the inner sleeve (32); both ends of the inner sleeve (32) and both ends of the fixed sleeve (23) are fixedly connected to the annular cover plate (3) by bolts; rubber pads are added between the two ends of the inner sleeve (32) and the two ends of the fixed sleeve (23) and the annular cover plate (3) to achieve sealing; and the inner sleeve (32) and the fixed sleeve (24) are connected to the inner sleeve (32) and the fixed sleeve (23) to form a seal. Electronic equipment is installed in the space between the inner sleeve (32) and the fixed sleeve (23); a ferromagnetic metal sleeve (24) coaxial with the inner sleeve (32) and the fixed sleeve (23) is arranged between the inner sleeve (32) and the fixed sleeve (23); a plurality of probe brackets (6) distributed around the axis of the fixed sleeve (23) of the circumferential excitation subunit are fixedly connected to the surface of the fixed sleeve (23); a circumferential magnet (7) is arranged between two adjacent probe brackets (6) on the circumferential excitation subunit, and the magnetic poles of the two groups of circumferential magnets (7) on both sides of the probe bracket (6) are arranged in opposite directions; the circumferential excitation subunits are two groups, and the probe brackets (6) on the two groups of circumferential excitation subunits are arranged crosswise.

7. The device for nondestructive testing of pipeline structure according to claim 4, characterized in that: The inner walls of the inner sleeve (32) of the circumferential excitation subunit and the inner sleeve (32) of the axial excitation subunit are both provided with sliding grooves that cooperate with the "T"-shaped sliding rail, and the inner sleeve (32) of the circumferential excitation subunit and the inner sleeve (32) of the axial excitation subunit are fixedly connected to the corresponding support unit section (9) through a locking structure B.

8. The device for nondestructive testing of pipeline structure according to claim 7, characterized in that: The locking structure B comprises a hexagonal metal block (25), an internal thread sleeve (26), a screw (27), a wedge block A (28), a wedge block B (29), a spring B (30) and a latch A (31); the internal thread sleeve (26) is welded to the inner sleeve (32) via a metal bracket; the axis of the internal thread sleeve (26) is parallel to the axis of the inner sleeve (32); the inner sleeve (32) is internally threadedly connected with the screw (27); one end of the screw (27) is welded to the end of the hexagonal metal block (25) outside the annular cover plate (3); the other end of the screw (27) is welded to the end of the hexagonal metal block (25) outside the annular cover plate (3); One end is rotatably connected to a mounting groove provided on a side of a wedge block A (28) through a bearing. The inclined surface of the wedge block A (28) contacts the inclined surface of the wedge block B (29) and can slide against each other. A latch pin A (31) perpendicular to the axis is fixedly connected to the surface of the wedge block B (29) opposite to its inclined surface. A through hole is provided in the corresponding inner sleeve (32) for the latch pin A (31) to pass through. A slot is provided on the corresponding support unit section (9) for the end of the latch pin A (31) to be inserted. A spring B (30) is provided between the wedge block B (29) and the inner sleeve (32).

9. The device for nondestructive testing of pipeline structure according to claim 4, characterized in that: The wheel frame (2) is a Y-shaped metal part. The two ends of the wheel frame (2) are rotatably connected to the wheel axle via bearings. The wheel frame (2) and the support unit section (9) are fixedly connected via a locking structure A.

10. The device for nondestructive testing of pipeline structure according to claim 9, characterized in that: The locking structure A comprises a spring C (20), a latch pin B (21) and a lever (22), wherein the latch pin B (21) is slidably connected in a latch pin slot provided at the other end of the wheel frame (2), and a spring C (20) is arranged between the end of the latch pin B (21) and the inner end of the latch pin slot, and an outer surface of the wheel frame (2) is provided with a lever slot connected to the latch pin slot, and the lever (22) is slidably connected in the lever slot, and one end of the lever (22) is threadedly connected to the surface of the latch pin B (21), and the spring C inserts the latch pin B (21) into a corresponding slot on the support unit section (9).

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