CN220084764U

CN220084764U - Scanning device suitable for pipeline inner wall annular welding seam detects

Info

Publication number: CN220084764U
Application number: CN202321401280.8U
Authority: CN
Inventors: 张瑞; 龙绍军; 谢鹏
Original assignee: Eintec Technology Shanghai Co ltd
Current assignee: Eintec Technology Shanghai Co ltd
Priority date: 2023-06-03
Filing date: 2023-06-03
Publication date: 2023-11-24
Anticipated expiration: 2033-06-03

Abstract

The utility model relates to a scanning device suitable for detecting an annular welding seam on the inner wall of a pipeline, which relates to the technical field of nondestructive detection. The main body support is also provided with an image acquisition part close to the ultrasonic probe and used for positioning the welding line, so that the problem of positioning the ultrasonic probe and the welding line can be solved. An elastic pre-pressing assembly is arranged between the ultrasonic probe and the main body support, the elastic pre-pressing assembly applies elastic force perpendicular to the contact surface of the inner wall of the pipeline to the ultrasonic probe, the ultrasonic probe is guaranteed to be attached to the inner wall of the pipeline under stable pressure, when the inner diameter of a measured workpiece has fine tolerance change, the ultrasonic probe can adapt to the size change, and the elastic pre-pressing reduces rigid friction between the ultrasonic probe and the measured workpiece, so that the service life is prolonged.

Description

Scanning device suitable for pipeline inner wall annular welding seam detects

Technical Field

The utility model relates to the technical field of nondestructive testing, in particular to a scanning device suitable for detecting annular welding seams on the inner wall of a pipeline.

Background

Nondestructive testing technology is an important means for ensuring product quality and equipment operation safety in the modern industry, and the level of the nondestructive testing technology is an important sign of national industrial development. With the wide application of nondestructive testing technology, various structural parts become more complex, the space limitation of application occasions is also more and more large, and the requirements on an ultrasonic probe and a scanning device are also more and more high. How to apply ultrasonic detection technology in narrow space, such as small-diameter inner wall and other occasions, is a leading-edge subject of research in the field of ultrasonic detection in recent years.

For nondestructive testing of the inner wall of a pipeline, the main difficulties are as follows: firstly, the space of the inner wall of a medium-small pipeline is limited, and manual work cannot enter the medium-small pipeline to carry out handheld scanning detection; secondly, the positions of the welding seams on the inner wall are difficult to observe with naked eyes, and the ultrasonic probe is difficult to position; thirdly, how to ensure that the ultrasonic probe is attached to the inner wall of the pipeline under stable pressure, and ensure the coupling between the probe and the workpiece to be tested during scanning; fourth, how to reduce the friction between the scanning device and the workpiece to be tested, reduce the abrasion and prolong the service life.

Most scanning devices on the market at present mainly detect the surface that the object is plane work piece or pipe class work piece, and to pipe diameter inner wall scanning device less, can't scan the pipeline inner wall welding seam accurately.

Disclosure of Invention

In order to accurately scan the inner wall of a narrow pipeline, the utility model provides a scanning device suitable for detecting the annular welding seam of the inner wall of the pipeline.

The utility model provides a scanning device suitable for detecting an annular welding seam on the inner wall of a pipeline, which adopts the following technical scheme:

the scanning device suitable for detecting the annular weld joint of the inner wall of the pipeline comprises a main body support, wherein one end of the main body support is provided with a handle for holding the scanning device, the other end of the main body support is provided with an ultrasonic probe, and at least part of the ultrasonic probe is provided with an arc-shaped surface which is abutted against the inner wall of the pipeline;

an elastic pre-pressing assembly is arranged between the ultrasonic probe and the main body support, the elastic pre-pressing assembly applies elastic force perpendicular to the contact surface of the inner wall of the pipeline to the ultrasonic probe, and the main body support is also provided with an image acquisition piece for positioning welding seams close to the ultrasonic probe.

By adopting the technical scheme, an operator holds the handle of the scanning device, stretches one end of the ultrasonic probe into a narrow pipeline, judges the position of a welding line in the pipeline by utilizing the image acquisition piece on the main body bracket, and then adjusts the stretching depth of the scanning device to ensure that the ultrasonic probe is in good contact with the welding line, so that the coupling between the ultrasonic probe and the surface of the welding line during scanning is ensured; the ultrasonic probe is connected and is provided with the elastic pre-pressing assembly, the pressure acted on by the ultrasonic probe is elastic pressure, so that the ultrasonic probe always has a certain elastic activity allowance in the direction perpendicular to the contact surface of the inner wall of the pipeline, a section of elastic reciprocating motion stroke is provided, when the inner diameter of the pipeline of a tested workpiece has fine tolerance change, the ultrasonic probe can adapt to the dimensional change, the elastic pre-pressing reduces the rigid friction between the ultrasonic probe and the inner wall of the pipeline, thereby prolonging the service life, and meanwhile, the elastic pressure provided by the elastic pre-pressing assembly always enables the ultrasonic probe to abut against the contact surface of the inner wall of the pipeline, so that the coupling between the ultrasonic probe and the tested workpiece during scanning is ensured.

Optionally, the main body support is cylindrical and is hollow to form a containing cavity;

the ultrasonic probe comprises a probe shell, a core and a wedge, wherein the probe shell is arranged on the mounting groove.

Through adopting above-mentioned technical scheme, cylindric main part support shape suits with the pipeline inner wall, holds the cable conductor that the chamber can hold ultrasonic probe, image acquisition spare connection.

Optionally, the elastic pre-pressing assembly comprises a guide member and an elastic member;

the probe shell is provided with a fixing through hole, the mounting groove is provided with a fixing threaded hole, and the guide piece is configured to be inserted into the fixing through hole and is in threaded connection with the fixing threaded hole;

the probe shell is provided with clamping grooves on the opposite surfaces of the mounting grooves, and the elastic piece is arranged between the clamping grooves and provides elastic force for the ultrasonic probe along the length direction of the guide piece.

By adopting the technical scheme, the plugging screw is of a structure that a bolt adds an optical axis, the screw end is used for fixing and is in threaded connection with the fixing threaded hole, the optical axis section penetrates through the fixing through hole of the probe shell to realize guiding, and the probe shell can perform elastic reciprocating motion with a certain stroke along the axial direction of the plugging screw under the elastic action of the elastic pre-pressing assembly; the clamping groove can ensure that the pressure provided by the elastic piece and the position where the elastic piece is positioned are stable and are not easy to deviate from.

Optionally, the ultrasonic probes are configured in two groups, and wedges of the two groups of ultrasonic probes are arranged in opposite directions.

By adopting the technical scheme, two groups of ultrasonic probes can be arranged on two sides of the weld joint to be detected, and by placing two groups of probes on the left side and the right side of the weld joint, a wider detection range can be provided, the whole width of the weld joint is covered, and possible defects or abnormal areas can be found; by using the left and right groups of probes at the same time, the weld joint can be more comprehensively evaluated in one detection, the detection time and workload are reduced, and the detection efficiency is improved; the horizontal position of the defect in the welding seam can be determined by comparing signals received by the left and right groups of probes, and the detection results are mutually verified.

Optionally, an observation opening is formed in the mounting groove, and the observation opening is communicated with the accommodating cavity;

the image acquisition piece set up in hold the chamber, the image acquisition end of image acquisition piece is located two sets of between the ultrasonic probe, and towards observe the opening direction.

By adopting the technical scheme, when the image acquisition end of the image acquisition piece is right opposite to the welding line, the two groups of ultrasonic probes are just positioned at the two sides of the welding line, so that the effect of accurate positioning is achieved.

Optionally, the ultrasonic probe is provided with a couplant connector connected with an external couplant pipeline, the wedge block is provided with a couplant outlet, and the probe shell and the wedge block are internally provided with a couplant runner which is communicated with the couplant connector and the couplant outlet.

Through adopting above-mentioned technical scheme, set up the couplant interface on the ultrasonic probe, can be connected with external couplant pipeline, make couplant along couplant interface, couplant runner, couplant export flow to voussoir department, final couplant is carried to the laminating department of voussoir and measured workpiece inner wall, good couplability when guaranteeing the ultrasonic scanning.

Optionally, the main part support is last to be provided with the spacing ring, the spacing ring is provided with the breach, breach department is provided with and is used for locking bolt and lock nut at breach both ends.

Through adopting above-mentioned technical scheme, when the breach both ends loosen, the spacing ring can slide along main part support length direction, after the image acquisition spare positioning weld, remove spacing ring to the measured work piece terminal surface department to locking lock bolt and lock nut, the length that the main part support stretches into the pipeline inside is limited, and then the relative position of limit ultrasonic probe and welding seam, the axial relative position that makes scanning device and measured work piece no longer changes when scanning.

Optionally, the universal ball assembly is embedded along the circumference of the main body support, and the universal ball assembly is provided with a plurality of groups along the length direction of the main body support.

Through adopting above-mentioned technical scheme, universal ball changes the sliding friction of main part support and pipeline inner wall into rolling friction, reduces the frictional force of scanning device impel the survey work piece inner wall and scanning device when detecting around the rotatory a round of survey work piece inner wall to improve the life of whole equipment.

Optionally, positioning scales are arranged on the side wall of the main body support along the length direction of the main body support.

Through adopting above-mentioned technical scheme, location scale is used for referring to the degree of depth that sweeps the device and stretch into the measured workpiece inner wall at every turn, makes things convenient for image acquisition spare positioning weld, reduces the time and the work load of detection, improves detection efficiency.

Optionally, the handle is configured as the hand wheel, can dismantle between hand wheel and the main part support and be connected, just hand wheel central point puts the department seted up with hold the line hole that the chamber is linked together.

Through adopting above-mentioned technical scheme, the hand wheel makes things convenient for operating personnel to rotate and sweeps the device, makes it rotate inside the pipeline, can dismantle the setting and conveniently maintain and change and hold intracavity image acquisition spare and cable conductor, and the cable conductor can wear out the device of sweeping through the line hole, is connected with external equipment.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. judging the position of a welding line in the pipeline by utilizing an image acquisition piece on the main body support, and then adjusting the extending depth of the scanning device to ensure that the ultrasonic probe is in good contact with the welding line, so that the coupling between the ultrasonic probe and the surface of the welding line during scanning is ensured;

2. through setting up elasticity pre-compaction subassembly on the ultrasonic probe, the pressure that ultrasonic probe was acted on is elastic pressure for ultrasonic probe has certain elasticity activity allowance all the time in the direction of perpendicular pipeline inner wall contact surface, has one section elasticity reciprocating motion's stroke, and when the pipeline internal diameter of being surveyed the work piece had slight tolerance to change, ultrasonic probe can self-adaptation this kind of size change, and elasticity pre-compaction has reduced the rigidity friction between ultrasonic probe and the pipeline inner wall, thereby promote life, simultaneously, the elastic pressure that elastic pre-compaction subassembly provided makes ultrasonic probe support tightly pipeline inner wall contact surface all the time, the coupling of ultrasonic probe and being surveyed the work piece when guaranteeing to sweep.

Drawings

FIG. 1 is an overall schematic of the present utility model;

FIG. 2 is a schematic view of an ultrasound probe of the present utility model;

FIG. 3 is a schematic view of another angle of the ultrasonic probe of the present utility model;

FIG. 4 is a schematic illustration of the present utility model with parts broken away;

FIG. 5 is a schematic view of the notch of the stop collar of the present utility model.

Reference numerals: 1. a main body bracket; 11. a receiving chamber; 12. a mounting groove; 121. fixing the threaded holes; 13. an observation opening; 2. a handle; 21. a wire through hole; 3. an ultrasonic probe; 31. a probe housing; 311. a fixing through hole; 312. a clamping groove; 313. a couplant joint; 32. wedge blocks; 4. an elastic pre-pressing assembly; 41. a guide member; 42. an elastic member; 5. an image acquisition member; 6. a limiting ring; 61. a notch; 7. a universal ball assembly; 8. the scale is positioned.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the inventive concepts. As part of this specification, some of the drawings of the present disclosure represent structures and devices in block diagram form in order to avoid obscuring the principles of the disclosure. In the interest of clarity, not all features of an actual implementation are necessarily described. Furthermore, the language used in the present disclosure has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter, resort to the requisite claims to determine such inventive subject matter. Reference in the present disclosure to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and multiple references to "one embodiment" or "an embodiment" should not be understood as necessarily all referring to the same embodiment.

The terms "a," "an," and "the" are not intended to refer to a singular entity, but rather include the general class of which a particular example may be used for illustration, unless clearly defined. Thus, the use of the terms "a" or "an" may mean any number of at least one, including "one", "one or more", "at least one", and "one or more than one". The term "or" means any of the alternatives and any combination of alternatives, including all alternatives, unless alternatives are explicitly indicated as mutually exclusive. The phrase "at least one of" when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all of the listed items unless specifically so defined. The embodiment of the utility model discloses a scanning device suitable for detecting an annular welding seam on the inner wall of a pipeline, which is shown by referring to FIG. 1 and FIG 2, and comprises a main body support 1, wherein one end of the main body support 1 is provided with a handle 2 for holding the scanning device, the other end of the main body support is provided with an ultrasonic probe 3, and at least part of the ultrasonic probe 3 is provided with an arc-shaped surface which is abutted against the inner wall of the pipeline. The main body bracket 1 is also provided with an image acquisition piece 5 close to the ultrasonic probe 3 and used for positioning the welding line, so that the positioning problem of the ultrasonic probe 3 and the welding line position can be solved. An elastic pre-pressing component 4 is arranged between the ultrasonic probe 3 and the main body support 1, the elastic pre-pressing component 4 applies an elastic force perpendicular to the contact surface of the inner wall of the pipeline to the ultrasonic probe 3, the ultrasonic probe 3 is guaranteed to be attached to the inner wall of the pipeline under stable pressure, the coupling between the ultrasonic probe 3 and a tested workpiece during scanning is guaranteed, the pressure acted on by the ultrasonic probe 3 is elastic pressure, a section of elastic reciprocating motion stroke is designed, when the inner diameter of the tested workpiece has slight tolerance change, the ultrasonic probe 3 can adapt to the size change, and the elastic pre-pressing reduces the rigid friction between the ultrasonic probe 3 and the tested workpiece, so that the service life is prolonged.

In detail, as shown in fig. 2, the main body support 1 is cylindrical, and is adapted to the inner wall of the pipeline, the main body support 1 is hollow, and a containing cavity 11 is formed inside the main body support for containing the structures such as the cable wires connected with the ultrasonic probe 3 and the image acquisition member 5.

The side of the main body support 1 far away from one end of the handle 2 is provided with a mounting groove 12, the mounting groove 12 is arranged along the length direction of the main body support 1, and the ultrasonic probe 3 is arranged on the mounting groove 12.

As shown in fig. 2-3, the ultrasonic probe 3 includes a probe housing 31, a core, and a wedge 32, the probe housing 31 being disposed on the mounting groove 12, the wedge 32 being disposed toward the inner wall of the pipe.

In order to facilitate adding the couplant between the wedge block 32 and the workpiece to be tested, the ultrasonic probe 3 is provided with a couplant connector 313 connected with an external couplant pipeline, the wedge block 32 is provided with a couplant outlet, the probe shell 31 and the wedge block 32 are internally provided with a couplant runner which is communicated with the couplant connector 313 and the couplant outlet, the couplant flows to the wedge block 32 along the couplant interface, the couplant runner and the couplant outlet and is finally conveyed to the joint of the wedge block 32 and the inner wall of the workpiece to be tested, and good coupling performance during ultrasonic scanning is ensured.

As shown in fig. 2-3 and fig. 4 in combination, the elastic pre-pressing assembly 4 includes a guide member 41 and an elastic member 42, four fixing through holes 311 are formed in the probe housing 31, four fixing threaded holes 121 are formed in corresponding positions on the mounting groove 12, the guide member 41 is configured to be inserted into a plugging bolt screwed to the fixing threaded holes 121 in the fixing through holes 311, a clamping groove 312 is formed in a surface of the probe housing 31 opposite to the mounting groove 12, in the embodiment of the utility model, the elastic member 42 is configured as a spring, and the spring is disposed between the clamping grooves 312, so that pressure provided by the spring and the position where the spring is located are stable and are not easy to escape, an elastic force along the axial direction of the plugging bolt is provided for the ultrasonic probe 3, the plugging screw is in a structure of a bolt plus an optical axis, a screw end is used for fixing and is screwed to the fixing threaded holes 121, and an optical axis section is inserted into the fixing through holes 311 of the probe housing 31 to realize guiding, so that the probe housing 31 can perform elastic reciprocating motion with a certain stroke along the axial direction of the plugging screw under the elastic force of the elastic pre-pressing assembly 4.

As shown in fig. 1-2, the mounting groove 12 is provided with an observation opening 13, the observation opening 13 is communicated with the accommodating cavity 11, the image acquisition member 5 is arranged in the accommodating cavity 11, the ultrasonic probes 3 are configured into two groups, wedge blocks 32 of the two groups of ultrasonic probes 3 are oppositely arranged, the image acquisition end of the image acquisition member 5 is positioned between the two groups of ultrasonic probes 3 and faces the direction of the observation opening 13, and when the image acquisition end of the image acquisition member 5 is right opposite to the welding seam, the two groups of ultrasonic probes 3 are exactly positioned at two sides of the welding seam to play a role in accurate positioning.

Two groups of symmetrical ultrasonic probes 3 are arranged, the two groups of ultrasonic probes 3 can be arranged on two sides of a weld joint to be detected, and the coverage range and the detection efficiency of ultrasonic flaw detection can be increased and the positioning and evaluation accuracy of the weld joint defects can be improved by arranging the two groups of ultrasonic probes 3 on the left side and the right side of the weld joint.

As shown in fig. 2 and fig. 5, the main body support 1 is provided with a limiting ring 6, the limiting ring 6 is provided with a notch 61, a locking bolt and a locking nut for locking two ends of the notch 61 are arranged at the notch 61, when two ends of the notch 61 are loosened, the limiting ring 6 can slide along the length direction of the main body support 1, after the image acquisition piece 5 locates the welding seam, the limiting ring 6 is moved to the end face of the detected workpiece, the locking bolt and the locking nut are locked, the length of the main body support 1 extending into the pipeline is limited, and then the relative position of the ultrasonic probe 3 and the welding seam is limited, so that the axial relative position of the scanning device and the detected workpiece is not changed during scanning.

As shown in fig. 2, in order to reduce the friction between the main body support 1 and the inner wall of the pipeline, a plurality of groups of universal ball assemblies 7 are embedded in the circumferential direction of the main body support 1, and the universal ball assemblies 7 are arranged along the length direction of the main body support 1, in the embodiment of the utility model, the universal ball assemblies 7 are arranged into three groups with approximately the same space, so that the sliding friction between the main body support 1 and the inner wall of the pipeline is converted into rolling friction, the friction when the scanning device pushes the inner wall of the workpiece to be detected and the scanning device rotates around the inner wall of the workpiece to be detected for one circle is reduced, and the service life of the whole device is prolonged.

As shown in fig. 2, a positioning scale 8 is arranged on the side wall of the main body bracket 1 along the length direction of the main body bracket, and is used for referencing the depth of the scanning device extending into the inner wall of the workpiece to be detected every time, so that the image acquisition part 5 can conveniently position the welding seam, the detection time and workload are reduced, and the detection efficiency is improved.

The handle 2 is configured as a hand wheel, the hand wheel is detachably connected with the main body support 1 through bolts, the hand wheel is convenient for operators to rotate the scanning device, the hand wheel rotates in a pipeline, the detachable arrangement is convenient for maintenance and replacement of the image acquisition piece 5 and the cable in the accommodating cavity 11, the center position of the hand wheel is provided with a wire passing hole 21 communicated with the accommodating cavity 11, the cable of the image acquisition piece 5 and the ultrasonic probe 3 can pass through the wire passing hole 21 to pass through the scanning device, the scanning device is connected with external equipment, the cable of the ultrasonic probe 3 is connected with a converter, and the scanning device is connected with detection equipment. In the embodiment of the utility model, the image acquisition member 5 is configured as an endoscopic camera, and can be externally connected with a mobile phone or other display screens to observe the relative position of the ultrasonic probe 3 and the welding seam of the inner wall of the measured workpiece.

The ultrasonic probe 3 and the parts of the scanning device in the embodiment of the utility model are required to be made of materials which are not easy to rust and corrode under severe environment, and the general index is that the salt spray test is more than 48 hours. The metal material may be stainless steel 304, stainless steel 316, copper nickel plating, aluminum alloy, etc.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims

1. The scanning device suitable for detecting the circular weld seam on the inner wall of the pipeline is characterized by comprising a main body support (1), wherein one end of the main body support (1) is provided with a handle (2) for holding the scanning device, the other end of the main body support is provided with an ultrasonic probe (3), and at least part of the ultrasonic probe (3) is provided with an arc-shaped surface which is abutted against the inner wall of the pipeline;

an elastic pre-pressing assembly (4) is arranged between the ultrasonic probe (3) and the main body support (1), the elastic pre-pressing assembly (4) applies elastic force perpendicular to the contact surface of the inner wall of the pipeline to the ultrasonic probe (3), and the main body support (1) is close to the ultrasonic probe (3) and is further provided with an image acquisition piece (5) for positioning welding seams.

2. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 1, wherein the main body bracket (1) is cylindrical and is arranged in a hollow manner to form a containing cavity (11);

the ultrasonic probe (3) comprises a probe shell (31), a core part and a wedge block (32), wherein the side surface of the main body support (1) far away from one end of the handle (2) is provided with a mounting groove (12), and the probe shell (31) is arranged on the mounting groove (12).

3. Scanning device suitable for the detection of circumferential welds on inner walls of pipes according to claim 2, characterized in that said elastic pre-compression assembly (4) comprises a guide (41) and an elastic member (42);

the probe shell (31) is provided with a fixing through hole (311), the mounting groove (12) is provided with a fixing threaded hole (121), and the guide piece (41) is configured to be inserted into the fixing through hole (311) and is in threaded connection with the fixing threaded hole (121);

the probe shell (31) and the mounting groove (12) are provided with clamping grooves (312) on the opposite surfaces, and the elastic piece (42) is arranged between the clamping grooves (312) and provides an elastic force along the length direction of the guide piece (41) for the ultrasonic probe (3).

4. A scanning device for detecting circumferential welds on inner walls of pipes according to claim 3, characterized in that the ultrasonic probes (3) are arranged in two groups, and the wedges (32) of the two groups of ultrasonic probes (3) are arranged in opposite directions.

5. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 4, wherein the installation groove (12) is provided with an observation opening (13), and the observation opening (13) is communicated with the accommodating cavity (11);

the image acquisition piece (5) is arranged in the accommodating cavity (11), and the image acquisition end of the image acquisition piece (5) is positioned between the two groups of ultrasonic probes (3) and faces the direction of the observation opening (13).

6. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 2, wherein the ultrasonic probe (3) is provided with a couplant joint (313) connected with an external couplant pipeline, the wedge block (32) is provided with a couplant outlet, and the probe shell (31) and the wedge block (32) are internally provided with a couplant runner for communicating the couplant joint (313) and the couplant outlet.

7. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 2, wherein the main body support (1) is provided with a limiting ring (6), the limiting ring (6) is provided with a notch (61), and a locking bolt and a locking nut for locking two ends of the notch (61) are arranged at the notch (61).

8. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 2, wherein the universal ball assemblies (7) are embedded along the circumferential direction of the main body support (1), and a plurality of groups of the universal ball assemblies (7) are arranged along the length direction of the main body support (1).

9. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 2, wherein the side wall of the main body bracket (1) is provided with positioning scales (8) along the length direction of the main body bracket.

10. The scanning device for detecting the circumferential weld of the inner wall of the pipeline according to claim 2, wherein the handle (2) is configured as a hand wheel, the hand wheel is detachably connected with the main body bracket (1), and a wire passing hole (21) communicated with the accommodating cavity (11) is formed in the center position of the hand wheel.