CN209841775U

CN209841775U - Improved generation removes convenient steel sheet device of detecting a flaw

Info

Publication number: CN209841775U
Application number: CN201920287603.2U
Authority: CN
Inventors: 李刚; 石建卫; 刘永龙
Original assignee: Sinosteel Xian Machinery Co Ltd
Current assignee: Sinosteel Xian Machinery Co Ltd
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2019-12-24
Anticipated expiration: 2029-03-07

Abstract

The utility model provides an improved generation removes convenient steel sheet flaw detection device, the medium of detecting a flaw is arranged in between probe and the steel sheet, oscilloscope collection probe feedback's signal, still include the probe mount pad, probe mount pad middle part is equipped with the cavity of installation probe, the probe is arranged in the cavity, the medium holding tank is communicated with the probe bottom surface, probe mount pad bottom surface and steel sheet contact, the shell is equipped with the cavity, the probe mount pad is arranged in shown cavity inside, the rolling wheel is located the cavity outside; the movable protrusion is embedded into the movable groove; the probe mounting seat moves up and down in the hollow cavity under the combined action of the traction assembly and the pushing assembly. Through above-mentioned scheme, when removing the device of detecting a flaw, utilize the subassembly of pulling to upwards promote the probe mount pad from the shell, rely on the wheel that rolls to reduce the labour in the time of the removal, protect probe and probe mount pad simultaneously, when measuring, the subassembly that promotes is promoted the probe mount pad downwards for its bottom surface is hugged closely with the steel sheet.

Description

Improved generation removes convenient steel sheet device of detecting a flaw

Technical Field

The utility model relates to a steel sheet field of detecting a flaw especially relates to a convenient steel sheet of improved generation removal device of detecting a flaw.

Background

At present, in the field of plate flaw detection, most of the conventional flaw detection modes are maintained, and the shoulder and back flaw detector and the hand-held probe are operated by the duck step on the plate in a squatting mode. The operation mode is more suitable for detection in a small area range, if the whole steel plate is detected in batches, the operation is time-consuming and labor-consuming, the labor intensity is high, the efficiency is low, the probe of the flaw detector is held by a hand for a long time, the duck does not conform to the ergonomic theory of a specific working mode before the duck steps on the plate, and irreversible damage can be caused to the body of a related operator.

Meanwhile, the medium is required to act between the probe and the steel plate for flaw detection of the steel plate, the sealing degree of the steel plate is uncontrollable in the using process due to the roughness of the surface of the steel plate and the sealing ring arranged on the probe, the medium is easy to lose, and the measuring accuracy is influenced by the flowing of the medium in the detection process. The traditional sealing structure is easy to wear in the using process and cannot meet the actual use requirement.

When moving the flaw detection device simultaneously, need wholly mention the flaw detection device, weight is great, can also appear pounding the accident of hindering.

In view of this, an improved generation removes convenient steel sheet flaw detection device now.

Disclosure of Invention

An object of the utility model is to provide a convenient steel sheet of improved generation removal device of detecting a flaw carries out the removal of operatable through setting up the probe on the shell, utilizes the wheel that rolls to remove the device of detecting a flaw, prevents to damage probe and probe mount pad when removing to realize convenient removal device of detecting a flaw.

The utility model discloses a technique be:

an improved movable convenient steel plate flaw detection device comprises a probe, an oscilloscope and a flaw detection medium, wherein the flaw detection medium is arranged between the probe and a steel plate, the oscilloscope collects signals fed back by the probe, the flaw detection device also comprises a probe mounting seat, the middle part of the probe mounting seat is provided with a cavity for mounting the probe, the probe is arranged in the cavity, the probe mounting seat is also provided with a medium storage tank surrounding the cavity, the medium storage tank is communicated with the bottom surface of the probe, when the improved movable convenient steel plate flaw detection device works, the bottom surface of the probe mounting seat is contacted with the steel plate, and the flaw detection medium flows to a gap between the steel plate and; the probe mounting seat is arranged in the hollow cavity, a plurality of rolling wheels are arranged at the bottom of the shell, and the rolling wheels are positioned on the outer side of the hollow cavity; a moving bulge is arranged on the side surface of the probe mounting seat, a moving groove is formed in the inner wall of the hollow cavity, and the moving bulge is embedded into the moving groove; the device also comprises a pushing assembly and a traction assembly, wherein the pushing assembly is arranged between the top surface of the probe mounting seat and the shell, the pushing assembly is always in a compressed state, and the traction assembly is connected with the probe mounting seat; the pushing assembly pushes the probe mounting seat downwards, the moving protrusion abuts against the moving groove, and the bottom surface of the probe mounting seat is lower than or level to the bottom surface of the rolling wheel; the probe mounting seat is lifted upwards by the traction assembly, and the bottom surface of the probe mounting seat is higher than the bottom surface of the rolling wheel; the probe mounting seat moves up and down in the hollow cavity under the combined action of the traction assembly and the pushing assembly.

Through above-mentioned scheme, when removing the device of detecting a flaw, utilize the subassembly of pulling to upwards promote the probe mount pad from the shell, rely on the wheel that rolls to reduce the labour in the time of the removal, protect probe and probe mount pad simultaneously, when measuring, the subassembly that promotes is promoted the probe mount pad downwards for its bottom surface is hugged closely with the steel sheet.

As further optimization of the scheme, the probe mounting seat further comprises a first sealing ring, wherein the first sealing ring is arranged at the bottom of the probe mounting seat and is positioned on the periphery of the medium storage groove; the second sealing ring is arranged at the bottom of the probe mounting seat and is positioned on the periphery of the first sealing ring; still include the sealing washer lubrication groove, the sealing washer lubrication groove is located between first sealing washer and the second sealing washer, and the sealing washer lubrication groove communicates with the medium holding tank. The two-stage sealing ring and the medium sealing effect are formed on the outer side of the probe, the medium between the probe and the steel plate is prevented from losing, the flaw detection medium serves as a flaw detection working link on one hand, and on the other hand, the sealing effect on the self is formed, meanwhile, the sealing ring is lubricated by the medium, the abrasion of the sealing ring is prevented, the service life of the sealing ring is prolonged, and the measurement stability during flaw detection is improved.

The probe comprises a probe mounting seat, a medium storage groove, a medium joint and a medium tank, wherein the medium joint is connected with the probe mounting seat and communicated with the medium storage groove, and the medium tank is connected with the medium joint through a hose. Flaw detection media are supplied through media tanks, and media storage tanks are connected by media connectors.

As the further optimization of the scheme, the device also comprises a stopping component, wherein the stopping component is communicated with the medium tank, and the stopping component is communicated with the medium joint. The stopping component is used for cutting off the supply of the medium when the flaw detection device is moved, and the loss of the medium is prevented.

As a further optimization of the scheme, the device also comprises a handheld rod, and one end of the handheld rod is hinged with the side face of the shell. In order to facilitate the movement of the flaw detection device and the working convenience of operators, the handheld rod is hinged with the shell to adapt to operators with various heights. The cooperation is rolled the wheel and can be realized promoting or dragging, and it is convenient to remove.

The scheme is further optimized, the hand-held rod limiting device further comprises a limiting structure, the limiting structure is arranged on the shell, the limiting structure semi-surrounds the hand-held rod and one end, hinged to the shell, of the limiting structure, and the rotating angle of the hand-held rod is limited. In order to improve the security, laminate practical use more, handheld pole passes through limit structure and is controlling pivoted angle, prevents when mentioning mobile device that the device upset of detecting a flaw is excessive.

As a further optimization of the scheme, the traction assembly is connected with the stopping assembly, and the traction assembly is arranged at one end of the handheld rod far away from the shell. The traction assembly is arranged, so that when the probe mounting seat is lifted to leave the steel plate mobile flaw detection device, the supply of cutting media is fast and conveniently carried out.

Compared with the prior art, the beneficial effects of the utility model are that:

when the flaw detection device is moved, the probe mounting seat is lifted upwards from the shell by the traction assembly, labor force is reduced by the aid of the rolling wheels during movement, the probe and the probe mounting seat are protected, and the probe mounting seat is pushed downwards by the pushing assembly during measurement, so that the bottom surface of the probe mounting seat is tightly attached to a steel plate.

Through above-mentioned scheme, form two-stage sealing washer and the sealed effect of medium in the probe outside, prevent the medium loss between probe and the steel sheet, the medium of detecting a flaw is regarded as the work link of detecting a flaw on the one hand, and on the other hand has formed the sealed effect to self, and through the lubricated sealing washer of medium, prevent that the sealing washer from taking place wearing and tearing simultaneously, the life of extension sealing washer increases the measurement stability when detecting a flaw.

The handheld rod is matched with the limiting structure, so that the large-range moving flaw detection of the operators is greatly facilitated, and the device is safer when being moved.

Drawings

Fig. 1 is a schematic structural diagram of an improved mobile convenient steel plate flaw detection device provided by the utility model;

fig. 2 is a partially enlarged view of a in fig. 1.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1:

referring to the attached drawings 1-2, an improved movable convenient steel plate 4 flaw detection device comprises a probe 1, an oscilloscope 2 and flaw detection media, wherein the flaw detection media are arranged between the probe 1 and a steel plate 4, the oscilloscope 2 collects signals fed back by the probe 1, the flaw detection device also comprises a probe mounting seat 3, a cavity for mounting the probe 1 is arranged in the middle of the probe mounting seat 3, the probe 1 is arranged in the cavity, the probe mounting seat 3 is also provided with a medium storage tank 31 surrounding the cavity, the medium storage tank 31 is communicated with the bottom surface of the probe 1, when the improved movable convenient steel plate 4 flaw detection device works, the bottom surface of the probe mounting seat 3 is contacted with the steel plate 4, and the flaw detection media flow to a gap between the steel plate 4 and the probe; the probe mounting seat is characterized by further comprising a shell 12, wherein the shell 12 is provided with a hollow cavity, the probe mounting seat 3 is arranged in the hollow cavity, a plurality of rolling wheels 13 are arranged at the bottom of the shell 12, and the rolling wheels 13 are positioned on the outer side of the hollow cavity; a moving protrusion 34 is arranged on the side surface of the probe mounting seat 3, a moving groove 121 is arranged on the inner wall of the hollow cavity, and the moving protrusion 34 is embedded into the moving groove 121; the device also comprises a pushing component 14 and a traction component 11, wherein the pushing component 14 is arranged between the top surface of the probe mounting seat 3 and the shell 12, the pushing component 14 is always in a compressed state, and the traction component 11 is connected with the probe mounting seat 3; the pushing assembly 14 pushes the probe mounting base 3 downwards, the moving protrusion 34 abuts against the moving groove 121, and the bottom surface of the probe mounting base 3 is lower than or level to the bottom surface of the rolling wheel 13; the traction assembly 11 lifts the probe mounting seat 3 upwards, and the bottom surface of the probe mounting seat 3 is higher than the bottom surface of the rolling wheel 13; the probe mounting base 3 moves up and down in the hollow cavity under the combined action of the traction assembly 11 and the pushing assembly 14.

The traditional flaw detection device is generally only provided with a probe mounting seat 3 and a layer of sealing ring is arranged on the probe mounting seat 3, the measurement is carried out on a steel plate 4 through a handheld device, the labor intensity of the moving device is high in the process, the weight of the device is not light, the operation personnel can not conveniently lift the device, and the push-pull device can be directly arranged on the steel plate 4 to easily cause the abrasion of the sealing ring. In this embodiment, set up a shell 12 in the outside of probe mount pad 3, when needing to remove the device of detecting a flaw, carry through traction assembly 11 to probe mount pad 3 and draw, probe mount pad 3 leaves steel sheet 4, and it is very convenient to promote shell 12 through rolling wheel 13 mobile device this moment, and when detecting a flaw, traction assembly 11 is out of work, pushes probe mount pad 3 downwards through promotion subassembly 14. The movable protrusion 34 and the movable groove 121 are designed in a matched mode, when the probe mounting base 3 is pushed to the bottom, the movable protrusion 34 abuts against the movable groove 121, the downward position is limited, and the steel plate 4 is enabled to be attached to the probe mounting base 3 in the flaw detection process.

Therefore, whether the traction assembly 11 is in the working state or not is determined according to whether the flaw detector needs to be moved or not, and the traction assembly 11 only needs to realize the function of lifting the probe mounting base 3 upward. In this embodiment, the pushing member 14 may be a spring or other elastic component.

Through the scheme, when the flaw detection device is moved, the probe mounting base 3 is lifted upwards from the shell 12 by the traction assembly 11, labor force is reduced by the rolling wheels 13 during movement, the probe 1 and the probe mounting base 3 are protected, and during measurement, the probe mounting base 3 is pushed downwards by the pushing assembly 14, so that the bottom surface of the probe mounting base is tightly attached to the steel plate 4.

Example 2:

referring to fig. 1-2, the difference between this embodiment and embodiment 1 is that the sealing of the flaw detection device against the flaw detection medium is further optimized to form a two-stage sealing effect.

In the embodiment, the device further comprises a first sealing ring 5, wherein the first sealing ring 5 is arranged at the bottom of the probe mounting seat 3 and is positioned on the periphery of the medium storage groove 31; the probe mounting seat is characterized by further comprising a second sealing ring 6, wherein the second sealing ring 6 is arranged at the bottom of the probe mounting seat 3 and is positioned on the periphery of the first sealing ring 5; still include sealing washer lubrication groove 32, sealing washer lubrication groove 32 locates between first sealing washer 5 and the second sealing washer 6, and sealing washer lubrication groove 32 and medium holding tank 31 intercommunication.

In the traditional flaw detection of the steel plate 4, a water immersion ultrasonic method is mostly adopted, an oscilloscope 2 is adopted to collect waveforms formed by ultrasonic transmission of a probe 1 in a flaw detection medium and the steel plate 4 to judge whether the steel plate 4 has defects, when the thickness of the medium layer is not changed with that of the steel plate 4, the waveforms formed by the oscilloscope 2 are also stable waveforms, and when the steel plate 4 has defects, the ultrasonic conduction in the steel plate 4 is changed, and the waveforms of the oscilloscope 2 fluctuate, so that whether the steel plate 4 has the defects is judged. Therefore, the thickness of the medium layer also needs to be ensured to be free from fluctuation, namely, to ensure medium sealing between the probe 1 and the steel plate 4, so as to ensure stable flaw detection operation of the steel plate 4. The traditional sealing structure adopts a circle of sealing ring, the sealing ring is easy to damage in the process of measuring and moving the device for many times, and the medium between the probe 1 and the steel plate 4 can flow and even completely run off, thereby influencing the accuracy of flaw detection.

The novel double-seal steel plate 4 flaw detection device provided by the embodiment is characterized in that a first seal ring 5 and a second seal ring 6 are arranged on a probe mounting seat 3 to form a double-layer seal ring seal structure, and a seal ring lubrication groove 32 is arranged between the two seal rings to communicate with mounting grooves of the two seal rings. In actual use, the probe mounting seat 3 is arranged on the surface of the steel plate 4 to be detected, flaw detection media are injected through the media storage groove 31, the gap between the probe 1 and the steel plate 4 is filled with the media, and the media are filled through the sealing ring lubricating groove. When the flaw detection device is continuously moved on the steel plate 4, the sealing ring is lubricated by the medium to protect the sealing ring, and a sealing layer of the medium is formed by the tension of the medium and the adhesive force between the sealing rings.

The two-stage sealing ring and the medium sealing effect are formed on the outer side of the probe 1, the medium between the probe 1 and the steel plate 4 is prevented from losing, the flaw detection medium is used as a flaw detection working link, the sealing effect on the flaw detection medium is formed, meanwhile, the sealing ring is lubricated by the medium, the abrasion of the sealing ring is prevented, the service life of the sealing ring is prolonged, and the measurement stability during flaw detection is improved.

Example 3:

referring to fig. 1-2, the difference between this embodiment and embodiment 2 is that, in order to better perform a large-scale flaw detection operation, the flaw detection device needs to be moved, and the operator does not need to bend down between different operators.

The scheme further comprises a medium joint 8 and a medium tank 7, wherein the medium joint 8 is connected with the probe mounting seat 3 and communicated with the medium storage groove 31, and the medium tank 7 is connected with the medium joint 8 through a hose. Flaw detection media are supplied from the media tank 7, and the media storage tank 31 is connected using the media joint 8. In the embodiment, the medium tank 7 is used for storage, and when the flaw detection medium is actually used, the flaw detection medium is placed at a certain height and flows to the medium storage tank 31 under the action of gravity; in this embodiment, the medium joint 8 may be connected to a common hose, and the medium joint 8 is mounted on the probe mounting base 3 by means of a thread or welding.

As the scheme is further optimized, a stopping assembly 9 is further included, the stopping assembly 9 is communicated with the medium tank 7, and the stopping assembly 9 is communicated with the medium joint 8. The cutoff unit 9 is used to cut off the supply of the medium when the flaw detector is moved, thereby preventing the loss of the medium.

As a further optimization of the scheme, the handheld rod 10 is further included, and one end of the handheld rod 10 is hinged with the side face of the shell 12. In order to facilitate the movement of the flaw detection apparatus and the working convenience of the operator, the use of the hand-held rod 10 hinged to the housing 12 can accommodate operators of various heights. The rolling wheel 13 is matched to realize pushing or dragging, and the movement is convenient. By connecting the hand-held rod 10 with the housing 12, the operator can detect flaws without bending down.

As the further optimization of the scheme, the handheld rod device further comprises a limiting structure 33, wherein the limiting structure 33 is arranged on the shell 12, and the limiting structure 33 semi-surrounds one end, hinged with the shell 12, of the handheld rod 10 to limit the rotation angle of the handheld rod 10. In order to improve the safety and be more suitable for practical use, the hand-held rod 10 controls the rotating angle through the limiting structure 33, so that the fault detection device is prevented from being overturned excessively when the mobile device is lifted. When the limiting structure 33 is adopted to control the handheld rod 10 to lift the shell 12 of the probe mounting seat 3, the shell 12 only can rotate at a certain angle, so that the shell 12 is prevented from generating large vibration, the internal probe 1 is protected, and the sealing ring is prevented from falling off.

As a further optimization of the solution, a pulling assembly 11 is connected to the stop assembly 9, the pulling assembly 11 being mounted at the end of the hand lever 10 remote from the housing 12. The traction assembly 11 is arranged, so that the supply of the medium can be quickly and conveniently cut off when the flaw detection device is moved. The traction assembly 11 adopts structures like a brake handle of a bicycle, the traction assembly 11 can be acted by hands, the traction assembly 11 comprises a steel wire rope structure and is used for driving the stop assembly 9 and the lifting probe mounting seat 3 at the same time, and when the probe mounting seat needs to be moved, the medium is guaranteed not to be supplied, and the medium is guaranteed not to be wasted. In this embodiment, the stop assembly 9 cuts off the flow of the medium when pulled, similar to the brake structure of a bicycle, double-sided clamping or encircling stop.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An improved mobile convenient steel plate flaw detection device comprises a probe (1), an oscilloscope (2) and a flaw detection medium, the flaw detection medium is arranged between the probe (1) and the steel plate (4), the oscilloscope (2) collects signals fed back by the probe (1), it is characterized by also comprising a probe mounting seat (3), wherein the middle part of the probe mounting seat (3) is provided with a cavity for mounting the probe (1), the probe (1) is arranged in the cavity, the probe mounting seat (3) is also provided with a medium storage groove (31) surrounding the cavity, the medium storage groove (31) is communicated with the bottom surface of the probe (1), when the improved mobile convenient steel plate flaw detection device works, the bottom surface of the probe mounting seat (3) is in contact with a steel plate (4), and the flaw detection medium flows to a gap between the steel plate (4) and the probe (1) from the medium storage groove (31);

the probe mounting structure is characterized by further comprising a shell (12), wherein the shell (12) is provided with a hollow cavity, the probe mounting seat (3) is arranged in the hollow cavity, a plurality of rolling wheels (13) are arranged at the bottom of the shell (12), and the rolling wheels (13) are located on the outer side of the hollow cavity; a moving protrusion (34) is arranged on the side face of the probe mounting seat (3), a moving groove (121) is formed in the inner wall of the hollow cavity, and the moving protrusion (34) is embedded into the moving groove (121);

the device is characterized by further comprising a pushing assembly (14) and a traction assembly (11), wherein the pushing assembly (14) is arranged between the top surface of the probe mounting seat (3) and the shell (12), the pushing assembly (14) is always in a compressed state, and the traction assembly is connected with the probe mounting seat (3);

the pushing assembly (14) pushes the probe mounting seat (3) downwards, the moving protrusion (34) abuts against the moving groove (121), and the bottom surface of the probe mounting seat (3) is lower than or level to the bottom surface of the rolling wheel (13);

the probe mounting seat (3) is lifted upwards by the traction assembly (11), and the bottom surface of the probe mounting seat (3) is higher than the bottom surface of the rolling wheel (13); the probe mounting seat (3) moves up and down in the hollow cavity under the combined action of the traction assembly (11) and the pushing assembly (14).

2. The improved mobile convenient steel plate flaw detection device according to claim 1, further comprising a first sealing ring (5), wherein the first sealing ring (5) is arranged at the bottom of the probe mounting seat (3) and is positioned at the periphery of the medium storage groove (31); the probe mounting structure is characterized by further comprising a second sealing ring (6), wherein the second sealing ring (6) is arranged at the bottom of the probe mounting seat (3) and is positioned on the periphery of the first sealing ring (5); still include sealing washer lubrication groove (32), sealing washer lubrication groove (32) are located between first sealing washer (5) and second sealing washer (6), sealing washer lubrication groove (32) with medium holding tank (31) intercommunication.

3. The improved mobile convenient steel plate flaw detection device according to claim 2, further comprising a medium joint (8) and a medium tank (7), wherein the medium joint (8) is connected with the probe mounting seat (3) and communicated with the medium storage groove (31), and the medium tank (7) is connected with the medium joint (8).

4. The improved mobile convenient steel plate flaw detection device according to claim 3, further comprising a cut-off assembly (9), wherein the cut-off assembly (9) is communicated with the medium tank (7), and the cut-off assembly (9) is communicated with the medium joint (8).

5. The improved mobile portable steel plate flaw detection device according to claim 4, further comprising a hand-held lever (10), wherein one end of the hand-held lever (10) is hinged with the side of the housing (12).

6. The improved mobile convenient steel plate flaw detection device according to claim 5, further comprising a limiting structure (33), wherein the limiting structure (33) is arranged on the housing (12), and the limiting structure (33) semi-surrounds one end of the handheld rod (10) hinged to the housing (12) to limit the rotation angle of the handheld rod (10).

7. The improved mobile convenient steel plate flaw detection device according to claim 6, wherein the traction assembly (11) is connected with the cut-off assembly (9), and the traction assembly (11) is installed at one end of the handheld rod (10) far away from the shell (12).