阅读说明：本技术 管道漏磁检测装置 (Pipeline magnetic leakage detection device ) 是由 傅丹蓉 臧延旭 张永江 杨博霖 邸强华 金莹 李卫全 于超 刘佳 李�杰 肖春辉 于 2018-08-24 设计创作，主要内容包括：本发明公开了一种管道漏磁检测装置,包括支撑件、设置于支撑件上的第一磁化器组件、第二磁化器组件；第一磁化器组件、第二磁化器组件沿支撑件轴向分布；第一磁化器组件包括多个沿支撑件周向设置的第一磁化器；第二磁化器组件包括多个沿支撑件周向设置的第二磁化器；第一磁化器与第二磁化器交错设置；第一磁化器包括：设置于支撑件上的导磁铁轭；设置于导磁铁轭上、磁性相对的第一磁钢、第二磁钢,第一磁钢与第二磁钢之间具有磁场聚拢区域；设置于导磁铁轭上,位于磁场聚拢区域内的磁场感应器、数据采集器,与数据采集器电连接的处理器；设置于第一磁钢上的第一导磁耐磨钢,设置于第二磁钢上的第二导磁耐磨钢,用于与管道的内壁接触。(The invention discloses a pipeline magnetic flux leakage detection device which comprises a support piece, a first magnetizer assembly and a second magnetizer assembly, wherein the first magnetizer assembly and the second magnetizer assembly are arranged on the support piece; the first magnetizer assembly and the second magnetizer assembly are axially distributed along the support; the first magnetizer assembly comprises a plurality of first magnetizers arranged along the circumferential direction of the support; the second magnetizer assembly comprises a plurality of second magnetizers arranged along the circumferential direction of the support; the first magnetizer and the second magnetizer are arranged in a staggered way; the first magnetizer includes: a magnetic conductive iron yoke arranged on the supporting piece; the magnetic field gathering area is arranged between the first magnetic steel and the second magnetic steel; the magnetic field sensor and the data acquisition unit are arranged on the magnetic conductive iron yoke and positioned in the magnetic field gathering area, and the processor is electrically connected with the data acquisition unit; the first magnetic conduction wear-resistant steel is arranged on the first magnetic steel, and the second magnetic conduction wear-resistant steel is arranged on the second magnetic steel and is used for contacting with the inner wall of the pipeline.)

1. The utility model provides a pipeline magnetic leakage detection device which characterized in that, pipeline magnetic leakage detection device includes: the device comprises a support (1), a first magnetizer assembly (2) arranged on the support (1) and a second magnetizer assembly (3);

the first magnetizer assembly (2) and the second magnetizer assembly (3) are distributed along the axial direction of the support (1);

the first magnetizer assembly (2) includes: a plurality of first magnetizers (21) arranged along the circumferential direction of the support (1);

the second magnetizer assembly (3) includes: a plurality of second magnetizers (31) arranged along the circumferential direction of the support (1);

the first magnetizer (21) and the second magnetizer (31) are arranged in a staggered way;

the first magnetizer (21) includes: a magnetic iron yoke (211) arranged on the support (1);

the magnetic field gathering device comprises a first magnetic steel (212) and a second magnetic steel (213) which are arranged on the magnetic conductive iron yoke (211) and are opposite in magnetism, wherein a magnetic field gathering area (P) is arranged between the first magnetic steel (212) and the second magnetic steel (213);

the magnetic field sensor (214) and the data collector (215) are arranged on the magnetic conductive iron yoke (211) and positioned in the magnetic field gathering region (P), and the data collector (215) is electrically connected with the magnetic field sensor (214) and used for acquiring magnetic field information in the pipeline (M);

a processor electrically connected to the data collector (215) for processing the magnetic field information;

the first magnetic conduction wear-resistant steel (216) is arranged on the first magnetic steel (212), and the second magnetic conduction wear-resistant steel (217) is arranged on the second magnetic steel (213), and both the first magnetic conduction wear-resistant steel (216) and the second magnetic conduction wear-resistant steel (217) are used for contacting with the inner wall of the pipeline (M);

the second magnetizer (31) has the same structure as the first magnetizer (21).

2. The pipeline magnetic flux leakage detection device according to claim 1, wherein the first magnetic steel (212) and the second magnetic steel (213) are both U-shaped magnetic steels and are arranged oppositely.

3. The pipe leakage flux detecting apparatus according to claim 1, wherein said first magnetizer (21) further includes: the telescopic mechanism is arranged between the magnetic iron yoke (211) and the support piece (1);

the telescopic mechanism is used for enabling the first magnetic conduction wear-resistant steel (216) and the second magnetic conduction wear-resistant steel (217) to be in contact with the inner walls of the pipelines (M) with different inner diameters.

4. The flux leakage detecting device for a duct of claim 3, wherein said telescoping mechanism comprises: the device comprises a first support arm (2181), a second support arm (2182), a spring (2183), a push-pull rod (2184), a spring seat (2185), a first connecting piece (2186) and a second connecting piece (2187) which are arranged on the support (1);

the first support arm (2181) comprises: the device comprises an upper support arm (2181a) and a lower support arm (2181b) connected with the upper support arm (2181a), wherein an included angle is formed between the upper support arm (2181a) and the lower support arm (2181 b);

the upper end of the upper supporting arm (2181a) is rotatably arranged on the magnetic conductive iron yoke (211), and the lower end of the upper supporting arm is rotatably arranged at the upper end of the first connecting piece (2186);

the push-pull rod (2184) can move up and down along the lower end of the first connecting piece (2186), the first end of the push-pull rod (2184) penetrates through the lower end of the first connecting piece (2186) to be connected with the lower end of the lower supporting arm (2181b), and the second end of the push-pull rod is connected with the spring seat (2185);

the spring (2183) is sleeved on the push-pull rod (2184), a first end of the spring (2183) abuts against the first connecting piece (2186), and a second end of the spring (2183) abuts against the spring seat (2185);

the upper end of the second supporting arm (2182) is rotatably arranged on the magnetic conductive iron yoke (211), and the lower end of the second supporting arm is rotatably arranged on the second connecting piece (2187).

5. The pipeline magnetic flux leakage detection device of claim 4, wherein the included angle is 115 ° to 125 °.

6. The pipeline magnetic flux leakage detection device according to claim 4, wherein an accommodating groove is arranged on the outer wall of the support member (1);

the lower end of the first connecting piece (2186), the push-pull rod (2184), the spring (2183) and the spring seat (2185) are all located in the accommodating groove.

7. The pipe leakage flux detection apparatus according to claim 4, wherein said spring seat (2185) comprises: a small diameter unit (2185a) and a large diameter unit (2185b) connected to the small diameter unit (2185 a);

the second end of the push-pull rod (2184) penetrates through the small diameter part (2185a) to be connected with the large diameter part (2185 b);

the second end of the spring (2183) is seated on the large diameter part (2185b) and abuts against the outer wall of the small diameter part (2185 a).

8. The pipeline magnetic flux leakage detection device according to claim 1, wherein a plurality of guiding anti-collision wheels (219) are further arranged on the first magnetizer (21), and the guiding anti-collision wheels (219) are used for contacting with the inner wall of the pipeline (M).

9. The pipe leakage flux detecting apparatus according to claim 8, wherein said first magnetizer (21) further includes: a third connecting piece (2191) and a fourth connecting piece (2192) which are simultaneously connected with the magnetic conductive iron yoke (211), the first magnetic conductive wear-resistant steel (216) and the second magnetic conductive wear-resistant steel (217);

the third connecting piece (2191) and the fourth connecting piece (2192) are arranged oppositely, part of the guide anti-collision wheels (219) are arranged on the third connecting piece (2191), and the rest part of the guide anti-collision wheels (219) are arranged on the fourth connecting piece (2192).

10. The pipe leakage flux detecting apparatus according to claim 9, wherein a plurality of first ear plate assemblies (2193) are provided on the third connecting member (2191);

each of the first ear plate assemblies (2193) includes: the two ear plates are oppositely arranged and are used for being connected with the corresponding guide anti-collision wheel (219);

a plurality of second lug plate assemblies (2194) are arranged on the fourth connecting piece (2192);

each of the second ear plate assemblies (2194) includes: two ear plates which are oppositely arranged are used for being connected with the corresponding guide anti-collision wheel (219).

Technical Field

The invention relates to the technical field of pipeline repair, in particular to a pipeline magnetic flux leakage detection device.

Background

The oil and gas pipeline can lose efficacy due to corrosion, mechanical damage, geological damage, pipe self defects and other reasons after long-time operation, and pipeline leakage and explosion can be generated in severe cases. At present, in order to find the defects of the pipeline in time and prevent safety accidents, the pipeline magnetic flux leakage detection device is generally used for detecting the defects of the oil and gas pipeline. Therefore, it is necessary to provide a pipeline magnetic flux leakage detection device to realize the detection of the pipeline defect.

Disclosure of Invention

The embodiment of the invention provides a pipeline magnetic flux leakage detection device, which can solve the problems. The technical scheme is as follows:

the utility model provides a pipeline magnetic leakage detection device, pipeline magnetic leakage detection device includes: the first magnetizer assembly is arranged on the support;

the first magnetizer assembly and the second magnetizer assembly are distributed along the axial direction of the support;

the first magnetizer assembly includes: a plurality of first magnetizers disposed along a circumferential direction of the support;

the second magnetizer assembly includes: a plurality of second magnetizers disposed along a circumferential direction of the support;

the first magnetizer and the second magnetizer are arranged in a staggered way;

the first magnetizer includes: the magnetic iron yoke is arranged on the supporting piece;

the magnetic field gathering device comprises a first magnetic steel and a second magnetic steel which are arranged on the magnetic conductive iron yoke and are opposite in magnetism, wherein a magnetic field gathering area is arranged between the first magnetic steel and the second magnetic steel;

the magnetic field sensor and the data collector are arranged on the magnetic conductive iron yoke and positioned in the magnetic field gathering area, and the data collector is electrically connected with the magnetic field sensor and used for acquiring magnetic field information in a pipeline;

the processor is electrically connected with the data acquisition unit and is used for processing the magnetic field information;

the first magnetic conduction wear-resistant steel is arranged on the first magnetic steel, and the second magnetic conduction wear-resistant steel is arranged on the second magnetic steel, and the first magnetic conduction wear-resistant steel and the second magnetic conduction wear-resistant steel are both used for contacting with the inner wall of the pipeline;

the second magnetizer has the same structure as the first magnetizer.

In a possible design mode, the first magnetic steel and the second magnetic steel are both U-shaped magnetic steels and are arranged oppositely.

In one possible embodiment, the first magnetizer further includes: the telescopic mechanism is arranged between the magnetic iron yoke and the supporting piece;

the telescopic mechanism is used for enabling the first magnetic conduction wear-resistant steel and the second magnetic conduction wear-resistant steel to be in contact with the inner walls of the pipelines with different inner diameters.

In one possible embodiment, the telescopic mechanism comprises: the support device comprises a first support arm, a second support arm, a spring, a push-pull rod, a spring seat, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are arranged on the support piece;

the first support arm includes: the support device comprises an upper support arm and a lower support arm connected with the upper support arm, wherein an included angle is formed between the upper support arm and the lower support arm;

the upper end of the upper supporting arm is rotatably arranged on the magnetic conductive iron yoke, and the lower end of the upper supporting arm is rotatably arranged at the upper end of the first connecting piece;

the push-pull rod can move up and down along the lower end of the first connecting piece, the first end of the push-pull rod penetrates through the lower end of the first connecting piece to be connected with the lower end of the lower supporting arm, and the second end of the push-pull rod is connected with the spring seat;

the spring is sleeved on the push-pull rod, the first end of the spring abuts against the first connecting piece, and the second end of the spring abuts against the spring seat;

the upper end of the second supporting arm is rotatably arranged on the magnetic conductive iron yoke, and the lower end of the second supporting arm is rotatably arranged on the second connecting piece.

In one possible design, the included angle is 115 ° to 125 °.

In one possible design, the outer wall of the support is provided with a receiving groove;

the lower end of the first connecting piece, the push-pull rod, the spring and the spring seat are all located in the accommodating groove.

In one possible embodiment, the spring seat comprises: a small diameter part and a large diameter part connected with the small diameter part;

the second end of the push-pull rod penetrates through the small-diameter part and is connected with the large-diameter part;

the second end of the spring is seated on the large-diameter part and abuts against the outer wall of the small-diameter part.

In a possible design, the first magnetizer is further provided with a plurality of guide anti-collision wheels, and the guide anti-collision wheels are used for contacting with the inner wall of the pipeline.

In one possible embodiment, the first magnetizer further includes: the third connecting piece and the fourth connecting piece are simultaneously connected with the magnetic conductive iron yoke, the first magnetic conductive wear-resistant steel and the second magnetic conductive wear-resistant steel;

the third connecting piece with the fourth connecting piece sets up relatively, and some the direction anticollision wheel set up in on the third connecting piece, the remaining part the direction anticollision wheel set up in on the fourth connecting piece.

In one possible embodiment, a plurality of first lug plate assemblies are arranged on the third connecting element;

each of the first ear plate assemblies includes: the two ear plates are oppositely arranged and are used for being connected with the corresponding guide anti-collision wheels;

a plurality of second ear plate assemblies are arranged on the fourth connecting piece;

each of the second ear plate assemblies includes: and the two ear plates are oppositely arranged and are used for being connected with the corresponding guide anti-collision wheels.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

the pipeline magnetic flux leakage detection device provided by the embodiment of the invention has the advantages that the magnetic field gathering area is arranged between the first magnetic steel and the second magnetic steel of the first magnetizer and the second magnetizer, the magnetic field in the pipeline is mainly concentrated in the magnetic field gathering area to prevent the magnetic field from diffusing along the axial direction of the pipeline, and the first magnetic conduction wear-resistant steel which is used for contacting with the inner wall of the pipeline is arranged on the first magnetic steel, the second magnetic conduction wear-resistant steel which is used for contacting with the inner wall of the pipeline is arranged on the second magnetic steel, the weakening amount of the magnetic field intensity of the first magnetic steel and the second magnetic steel can be reduced, the effective utilization rate of the first magnetic steel and the second magnetic steel is improved, the axial lengths of the first magnetizer and the second magnetizer can be shortened on the premise of meeting the requirement that the pipe wall of the pipeline reaches magnetization saturation, the length of the pipeline magnetic flux leakage detection device can be further shortened, and the detection on the defects of the oil and gas pipeline is facilitated; through first magnetizer, the second magnetizer of crisscross setting, can carry out 360 detections to the defect of pipeline to carry out comprehensive detection to the defect of pipeline, and first magnetizer, second magnetizer set up on same support piece, and this also can shorten pipeline magnetic leakage detection device's length.

In summary, the magnetic flux leakage detection device provided by the embodiment of the invention belongs to a circumferential magnetic flux leakage detection device, and not only can shorten the length of the magnetic flux leakage detection device on the premise of satisfying the condition that the pipe wall of the pipeline reaches magnetization saturation, so that the magnetic flux leakage detection device is beneficial to detecting the defects of the oil and gas pipeline, but also is beneficial to being matched with an axial magnetic flux leakage detector to comprehensively detect the defects of the pipeline.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pipeline magnetic flux leakage detection apparatus provided in an embodiment of the present invention;

fig. 2 is a schematic view illustrating an installation of a first magnetizer and a supporting member according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first magnetizer according to an embodiment of the present invention;

FIG. 4 is a side view of a first magnetizer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a telescopic mechanism provided in an embodiment of the present invention.

Wherein the various reference numbers in the drawings are described below:

1-a support;

2-a first magnetizer assembly;

21-a first magnetizer;

211-a magnetically permeable iron yoke;

212-a first magnetic steel;

213-second magnetic steel;

214-a magnetic field inductor;

215-data collector;

216-first magnetically permeable, wear resistant steel;

217-second magnetically conductive wear resistant steel;

2181-a first support arm;

2181 a-upper support arm;

2181 b-lower support arm;

2182-a second support arm;

2183-spring;

2184-a push-pull rod;

2185-spring seat;

2185 a-small diameter part;

2185 b-large diameter part;

2186-a first connector;

2187-a second connector;

2188-a first fixing member;

2189-a second fixing member;

219-guide crash wheels;

2191-a third connecting member;

2192-fourth connecting member;

2193-a first otic placode assembly;

2194-a second ear plate assembly;

a P-field convergence region;

3-a second magnetizer assembly;

31-a second magnetizer;

m-pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment of the invention provides a pipeline magnetic flux leakage detection device, which comprises the following components as shown in the attached figure 1: the device comprises a support 1, a first magnetizer assembly 2 and a second magnetizer assembly 3, wherein the first magnetizer assembly 2 and the second magnetizer assembly 3 are arranged on the support 1; the first magnetizer assembly 2 and the second magnetizer assembly 3 are distributed along the axial direction of the support 1; the first magnetizer assembly 2 includes: a plurality of first magnetizers 21 (see fig. 2) disposed along a circumferential direction of the support 1; the second magnetizer assembly 3 includes: a plurality of second magnetizers 31 disposed along a circumferential direction of the support 1; the first magnetizer 21 and the second magnetizer 31 are arranged in a staggered way; as shown in fig. 3 and 4, the first magnetizer 21 includes: a magnetic iron yoke 211 disposed on the support 1; the first magnetic steel 212 and the second magnetic steel 213 are arranged on the magnetic conductive iron yoke 211 and have opposite magnetism, and a magnetic field gathering region P is arranged between the first magnetic steel 212 and the second magnetic steel 213; the magnetic field sensor 214 and the data collector 215 are arranged on the magnetic conductive iron yoke 211 and are positioned in the magnetic field gathering region P, and the data collector 215 is electrically connected with the magnetic field sensor 214 and is used for acquiring magnetic field information in the pipeline M; a processor electrically connected to the data collector 215; the first magnetic conduction wear-resistant steel 216 is arranged on the first magnetic steel 212, the second magnetic conduction wear-resistant steel 217 is arranged on the second magnetic steel 213, and both the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 are used for contacting with the inner wall of the pipeline M; the second magnetizer 31 has the same structure as the first magnetizer 21.

The magnetic field convergence region P is a region in which the magnetic field in the pipe M is mainly concentrated so that the magnetic field in the pipe M does not diverge in the axial direction of the pipe M.

The following description is given of the operation principle of the pipe leakage detecting apparatus according to the embodiment of the present invention:

the pipeline magnetic flux leakage detection device is installed in the pipeline M to be detected, the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 of the first magnetizer 21 and the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 of the second magnetizer 31 are both in contact with the inner wall of the pipeline M, and then the pipeline magnetic flux leakage detection device slides along the axial direction of the pipeline M.

In the sliding process of the pipeline magnetic flux leakage detection device, the first magnetic steel 212 and the second magnetic steel 213 of the first magnetizer 21 are used as excitation sources, a circumferential magnetic field is formed in the pipeline M, a closed magnetic circuit is formed in the pipeline M by being connected with the magnetic conductive iron yoke 211, and the magnetic fields of the first magnetic steel 212 and the second magnetic steel 213 are conducted to the inner wall of the pipeline M through the first magnetic conductive wear-resistant steel 216 and the second magnetic conductive wear-resistant steel 217. If the pipe wall of the pipe M has an axial defect, the distribution of the magnetic field in the pipe M is changed, and the distribution change of the magnetic field is detected by the magnetic field sensor 214, and the magnetic field information (i.e., the distribution change of the magnetic field) in the pipe M is transmitted to the data collector 215, and the data collector 215 transmits the magnetic field information to the processor, and the processor processes the received magnetic field information to evaluate the defect of the pipe M. Meanwhile, the defects of the pipeline M can be detected by 360 ° in combination with the second magnetizers 31 disposed alternately with the first magnetizers 21, so as to perform overall detection on the defects of the pipeline M.

The pipeline magnetic leakage detection device provided by the embodiment of the invention can make the magnetic field in the pipeline M mainly concentrate on the magnetic field gathering region P by arranging the magnetic field gathering region P between the first magnetic steel 212 and the second magnetic steel 213 of the first magnetizer 21 and the second magnetizer 31 so as to prevent the magnetic field from diverging along the axial direction of the pipeline M, and can also reduce the weakening amount of the magnetic field strength of the first magnetic steel 212 and the second magnetic steel 213 by arranging the first magnetic conduction wear-resistant steel 216 on the first magnetic steel 212 for contacting with the inner wall of the pipeline M and arranging the second magnetic conduction wear-resistant steel 217 on the second magnetic steel 213 for contacting with the inner wall of the pipeline M, thereby improving the effective utilization rate of the first magnetic steel 212 and the second magnetic steel 213, shortening the axial length of the first magnetizer 21 and the second magnetizer 31 on the premise of satisfying the magnetization saturation of the pipe wall of the pipeline M, and further shortening the length of the pipeline magnetic leakage detection device, the defect of the oil and gas pipeline M can be detected conveniently; through the first magnetizer 21 and the second magnetizer 31 which are arranged in a staggered mode, 360-degree detection can be carried out on the defects of the pipeline M so as to comprehensively detect the defects of the pipeline M, the first magnetizer 21 and the second magnetizer 31 are arranged on the same supporting piece 1, and the length of the pipeline magnetic flux leakage detection device can be shortened.

In summary, the magnetic flux leakage detection device provided by the embodiment of the invention belongs to a circumferential magnetic flux leakage detection device, and not only can shorten the length of the magnetic flux leakage detection device on the premise that the pipe wall of the pipeline M reaches magnetization saturation, and is beneficial to detecting the defects of the oil and gas pipeline M, but also is beneficial to matching with the axial magnetic flux leakage detection device of the pipeline to comprehensively detect the defects of the pipeline M.

Wherein, the plurality of first magnetizers 21 may be uniformly distributed along the circumferential direction of the supporting member 1, and the plurality of second magnetizers 31 may be uniformly distributed along the circumferential direction of the supporting member 1, so as to perform a comprehensive detection on the defect of the pipe M.

In the embodiment of the present invention, in order to make the polarities of the first magnetic steel 212 and the second magnetic steel 213 opposite, the polarity of the first magnetic steel 212 may be set as an N pole, and the polarity of the second magnetic steel 213 may be set as an S pole; alternatively, the polarity of the first magnetic steel 212 is set as S-pole, and the polarity of the second magnetic steel 213 is set as N-pole.

As described above, in order to avoid the magnetic field in the pipe M from diverging in the axial direction of the pipe M, a magnetic field convergence region P is provided between the first magnetic steel 212 and the second magnetic steel 213. The magnetic field convergence region P is formed according to the shapes and arrangement of the first magnetic steel 212 and the second magnetic steel 213. For example, as shown in fig. 3, in the embodiment of the present invention, the first magnetic steel 212 and the second magnetic steel 213 are both U-shaped magnetic steels and are arranged oppositely.

The first magnetic steel 212 and the second magnetic steel 213 are disposed opposite to each other, that is, the opening portion of the first magnetic steel 212 and the opening portion of the second magnetic steel 213 are disposed facing each other.

Of course, in the process of processing the first magnetic steel 212 and the second magnetic steel 213, the first magnetic steel 212 and the second magnetic steel 213 may be set to have a V-shaped or concave-shaped structure.

In addition, the first magnetic wear-resistant steel 216 may have the same structure as the first magnetic steel 212, and the second magnetic wear-resistant steel 217 may have the same structure as the second magnetic steel 213.

Regarding the fixing manner of the first magnetic steel 212 and the second magnetic steel 213, an example is given in the embodiment of the present invention, the first magnetic steel 212 and the second magnetic steel 213 are both fixed on the magnetic conductive iron yoke 211 by a fastener (e.g., a screw), specifically, a connection portion (e.g., a screw of the screw) of the fastener sequentially passes through the first magnetic conductive wear-resistant steel 216 and the first magnetic steel 212 and is fixed on the magnetic conductive iron yoke 211; similarly, the connection portion of the fastener (for example, the screw of the screw) is fixed to the magnetic conductive iron yoke 211 through the second magnetic conductive wear-resistant steel 217 and the second magnetic steel 213 in this order. By the above arrangement, first magnetic steel 212 and second magnetic steel 213 can be effectively fixed.

In addition, the materials of the first magnetic steel 212 and the second magnetic steel 213 can be neodymium iron boron alloy, and the magnetic steel is convenient to obtain.

In order to perform corrosion detection on pipes M with different inner diameters, in the embodiment of the present invention, the first magnetizer 21 further includes: a telescopic mechanism arranged between the magnetic iron yoke 211 and the support 1; the telescopic mechanism is used for enabling the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 to be in contact with the inner walls of the pipelines M with different inner diameters.

Regarding the number of the telescopic mechanisms, in the embodiment of the present invention, in order to effectively contact the first magnetic wear-resistant steel 216 and the second magnetic wear-resistant steel 217 with the inner walls of the pipes M having different inner diameters, one telescopic mechanism may be respectively disposed on two side walls of the magnetic iron yoke 211 perpendicular to the axial direction of the pipe M.

In addition, for the structure of the telescopic mechanism, on the premise of simple structure and convenient preparation, an example is given in the embodiment of the present invention, as shown in fig. 5, the telescopic mechanism includes a first support arm 2181, a second support arm 2182, a spring 2183, a push-pull rod 2184, a spring seat 2185, and a first connecting piece 2186 and a second connecting piece 2187 arranged on the support 1; the first support arm 2181 includes: an upper support arm 2181a and a lower support arm 2181b connected with the upper support arm 2181a, wherein an included angle is formed between the upper support arm 2181a and the lower support arm 2181 b; the upper end of the upper supporting arm 2181a is rotatably arranged on the magnetic conductive iron yoke 211, and the lower end is rotatably arranged at the upper end of the first connecting piece 2186; the push-pull rod 2184 can move up and down along the lower end of the first connecting piece 2186, and a first end of the push-pull rod 2184 passes through the first connecting piece 2186 to be connected with the lower end of the lower supporting arm 2181b, and a second end is connected with the spring seat 2185; the spring 2183 is sleeved on the push-pull rod 2184, a first end of the spring 2183 abuts against the first connecting piece 2186, and a second end of the spring 2183 abuts against the spring seat 2185; the upper end of the second support arm 2182 is rotatably disposed on the magnetic conductive iron yoke 211, and the lower end is rotatably disposed on the second connecting member 2187.

It should be noted that the spring 2183 in fig. 5 is in a semi-compressed state for supporting the first magnetizer 21 and the second magnetizer 22, and the spring 2183 in this state can be compressed continuously to adjust the heights of the first magnetizer 21 and the second magnetizer 22.

By the above arrangement, the operation process of the telescopic mechanism can be described as that, when the magnetic flux leakage detecting device enters the pipe M with a large inner diameter from the pipe M with a small inner diameter, the second end of the spring 2183 is reset in a direction away from the first connecting piece 2186, and pushes the spring seat 2185 to move in a direction away from the first connecting piece 2186, so that the spring seat 2185 drives the push-pull rod 2184 to move in a direction away from the first connecting piece 2186. Since the push-pull rod 2184 is connected to the lower supporting arm 2181b of the first supporting arm 2181, and the push-pull rod 2184 can move up and down along the first connecting part 2186, the push-pull rod 2184 drives the lower supporting arm 2181b to move away from the first connecting part 2186 and move upward at the same time. Because the upper support arm 2181a of the first support arm 2181 is connected to the lower support arm 2181b, the lower support arm 2181b may drive the upper support arm 2181a to move in the direction opposite to the moving direction of the push-pull rod 2184, and the first support arm 2181 may drive the second support arm 2182 to move in the direction opposite to the moving direction of the push-pull rod 2184, so as to move the magnetic iron yoke 211 upward until the first magnetic wear-resistant steel 216 and the second magnetic wear-resistant steel 217 contact the inner wall of the large inner diameter pipe M.

Regarding the number of the first support arms 2181, in order to enable the push-pull rod 2184 to effectively push the first support arms 2181 to move so as to effectively adjust the heights of the first magnetic-conductive wear-resistant steel 216 and the second magnetic-conductive wear-resistant steel 217, two opposite first support arms 2181 (see fig. 5) may be disposed on the same side wall of the magnetic-conductive iron yoke 211. Similarly, in order to make the first supporting arm 2181 effectively drive the second supporting arm 2182 to move, two opposite second supporting arms 2182 may be disposed on the same sidewall of the magnetic conductive iron yoke 211 (see fig. 5).

Based on the number of the first support arms 2181, an example of the installation manner of the first support arms 2181 is given below, as shown in fig. 5, a first fixing block 2188 is disposed on the bottom wall of the magnetic conductive iron yoke 211, and the upper ends of the upper support arms 2181a of the two first support arms 2181 are correspondingly disposed on two opposite side walls of the first fixing block 2188 and connected by a fastener (e.g., a pin). The first fixing block 2188 may be fixed to the bottom wall of the magnetic conductive iron yoke 211 by welding or screwing.

Correspondingly, the lower ends of the upper support arms 2181a of the two first support arms 2181 are correspondingly disposed on two opposite side walls of the upper end of the first connecting member 2186 and are connected by a fastener (e.g., a pin). The upper end of the first connector 2186 can be fixed by screwing with a protrusion (not shown) provided on the support 1.

It should be noted that the lower supporting arms 2181b of the two first supporting arms 2181 are located on the same side of the lower end of the first connecting member 2186, and the lower end of the first connecting member 2186 is provided with a vertical through hole, so that the push-pull rod 2184 can move up and down along the lower end of the first connecting member 2186.

Based on the number of the second supporting arms 2182, an example of the installation manner of the second supporting arms 2182 is given below, as shown in fig. 5, a second fixing block 2189 is disposed on the bottom wall of the magnetic conductive iron yoke 211, and the upper ends of the two second supporting arms 2182 are correspondingly disposed on two opposite side walls of the second fixing block 2189 and connected by a fastener (e.g., a pin). The second fixing block 2189 may be fixed to the bottom wall of the magnetic conductive iron yoke 211 by welding or screwing.

Correspondingly, the lower ends of the two second supporting arms 2182 are correspondingly disposed on the two opposite side walls of the second connecting member 2187 and are connected by a fastener (e.g., a pin). The second connector 2187 can be fixed by being connected to a protruding screw disposed on the supporting member 1.

Regarding the shapes of the first support arm 2181 and the second support arm 2182, the embodiment of the present invention provides an example that the upper support arm 2181a, the lower support arm 2181b and the second support arm 2182 of the first support arm 2181 are all configured in a straight-line structure on the premise of simple structure and convenient production and preparation.

In the first support arm 2181 based on the above structure, an included angle between the upper support arm 2181a and the lower support arm 2181b may be set to 115 ° to 125 °, for example, the included angle may be set to 115 °, 117 °, 119 °, 121 °, 123 °, 125 °, and the like. Through such setting, be convenient for adjust the height of first magnetic conduction wear-resisting steel 216, second magnetic conduction wear-resisting steel 217.

In addition, regarding the lengths of the upper support arm 2181a and the second support arm 2182 of the first support arm 2181 and the installation positions of the first fixing block 2188, the second fixing block 2189, the first connecting piece 2186 and the second connecting piece 2187, in order to ensure that the magnetic conductive iron yoke 211 is always horizontally arranged, the first magnetic conductive wear-resistant steel 216 and the second magnetic conductive wear-resistant steel 217 are effectively attached to the inner walls of the pipes M with different inner diameters, and the length of the upper support arm 2181a is the same as that of the second support arm 2182; the distance between the first connecting piece 2186 and the second connecting piece 2187 is the same as the distance between the first fixing block 2188 and the second fixing block 2189, the first connecting piece 2186 and the second connecting piece 2187 are horizontally arranged, and the first fixing block 2188 and the second fixing block 2189 are horizontally arranged. Through such arrangement, a parallelogram structure can be formed among the four first fixing block 2188, the second fixing block 2189, the first connecting piece 2186 and the second connecting piece 2187, so that the height of the first magnetic conductive wear-resistant steel 216 and the height of the second magnetic conductive wear-resistant steel 217 can be adjusted by changing the angles of the upper supporting arm 2181a and the second supporting arm 2182 of the first supporting arm 2181.

In the embodiment of the present invention, the outer wall of the supporting member 1 is provided with a receiving groove (not shown in the drawings); the lower end of the first connecting element 2186, the push-pull rod 2184, the spring 2183 and the spring seat 2185 are all located in the accommodating groove. In this way, the pull rod, the spring 2183 and the spring seat 2185 can be protected to prevent other components from scratching the outer walls of the pull rod, the spring 2183 and the spring seat 2185.

Wherein the support 1 is provided as a tubular structure.

As shown in fig. 5, in the embodiment of the present invention, the spring seat 2185 includes: a small diameter section 2185a and a large diameter section 2185b connected to the small diameter section 2185 a; a second end of the push-pull rod 2184 is connected with the large diameter portion 2185b through the small diameter portion 2185 a; a second end of the spring 2183 is seated on the large diameter portion 2185b and abuts against the outer wall of the small diameter portion 2185 a. By such arrangement, the second end of the spring 2183 can be conveniently fixed, and the outer wall of the push-pull rod 2184 is prevented from contacting with the spring 2183, so that the push-pull rod 2184 can move conveniently.

The outer diameter of the large diameter portion 2185b of the spring seat 2185 is larger than the outer diameter of the small diameter portion 2185 a.

The large diameter part 2185b and the small diameter part 2185a of the spring seat 2185 can be integrally formed, so that the connection strength between the large diameter part 2185b and the small diameter part 2185a is improved.

In addition, the second end of the push-pull rod 2184 can be in threaded connection with the large diameter portion 2185b, specifically, the outer wall of the second end of the push-pull rod 2184 is provided with threads, and the inner wall of the large diameter portion 2185b is provided with threads matched with the threads of the push-pull rod 2184. A first end of the push-pull rod 2184 may be connected to a lower end of the lower support arm 2181b by a fastener (e.g., a bolt).

Because the inner wall of the pipeline M is usually provided with the coating, in the embodiment of the present invention, in order to prevent the first magnetic wear-resistant steel 216 and the second magnetic wear-resistant steel 217 from directly contacting the coating on the inner wall of the pipeline M, the coating in the pipeline M is prevented from being damaged, and at the same time, in order to prevent the first magnetic wear-resistant steel 216 and the second magnetic wear-resistant steel 217 from colliding with the weld seam and the uneven portion of the inner wall of the pipeline M, and further prevent the first magnetizer 21 and the second magnetizer 31 from being damaged, as shown in fig. 1 and 5, the first magnetizer 21 is further provided with a plurality of guide collision wheels 219, and the guide collision wheels 219 are used for contacting the inner wall of the pipeline M.

Gaps are formed between the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 and the inner wall of the pipeline M respectively. It should be noted that the highest point of the guide anti-collision wheel 219 may be slightly higher than the first magnetic conductive wear-resistant steel 216 and the second magnetic conductive wear-resistant steel 217, for example, the highest point is 1mm to 2 mm.

Regarding the number of the guide anti-collision wheels 219, one guide anti-collision wheel 219 may be disposed at each of four corners of the first magnetizer 21 to effectively guide the first magnetizer 21.

In order to facilitate installation of the guide anti-collision wheel 219 in the embodiment of the present invention, as shown in fig. 5, the first magnetizer 21 includes: a third connecting piece 2191 and a fourth connecting piece 2192 which are simultaneously connected with the magnetic conductive iron yoke 211, the first magnetic conductive wear-resistant steel 216 and the second magnetic conductive wear-resistant steel 217; the third connecting member 2191 and the fourth connecting member 2192 are disposed opposite to each other, a part of the guide bumper 219 is disposed on the third connecting member 2191, and the rest of the guide bumper 219 is disposed on the fourth connecting member 2192.

The third connecting member 2191 and the fourth connecting member 2192 may be respectively configured as a strip structure, and the upper end of the third connecting member 2191 is connected to the first magnetic conductive wear-resistant steel 216 through a fastener (e.g., a screw), and the lower end is connected to the magnetic conductive iron yoke 211 through a fastener (e.g., a screw); the upper ends of the fourth connecting members 2192 are connected to the second magnetically conductive wear-resistant steel 217 by fasteners (e.g., screws), and the lower ends are also connected to the magnetically conductive iron yoke 211 by fasteners (e.g., screws).

In addition, as for the way that the guide anti-collision wheel 219 is disposed on the third connecting member 2191 and the fourth connecting member 2192, an example is given in the embodiment of the present invention, as shown in fig. 5, a plurality of first lug plate assemblies 2193 are disposed on the third connecting member 2191; each first ear plate assembly 2193 includes: two ear plates which are oppositely arranged and are used for connecting with the corresponding guide anti-collision wheels 219; a plurality of second lug plate assemblies 2194 are arranged on the fourth connecting piece 2192; each second ear plate assembly 2194 includes: two oppositely arranged ear plates are used for connecting with the corresponding guide anti-collision wheel 219.

The ear plate of the first ear plate assembly 2193 may be fixed to the third connecting member 2191 by welding, and the ear plate of the second ear plate assembly 2194 may be fixed to the fourth connecting member 2192 by welding.

Additionally, a portion of the guide bumper wheel 219 may be pinned between two oppositely disposed ear plates of the first ear plate assembly 2193; the remaining portion of the guide bumper wheel 219 may be pinned between two oppositely disposed ear plates of the second ear plate assembly 2194.

The number of the first lug plate elements 2193 and the second lug plate elements 2194 may be 2.

In the embodiment of the present invention, the first magnetic conduction wear-resistant steel 216 and the second magnetic conduction wear-resistant steel 217 may be configured to be matched with the inner wall of the pipeline M, so as to facilitate effective detection of the magnetic field distribution on the inner wall of the pipeline M. Further, the first magnetic steel 212 may be configured to be matched with the bottom wall of the first magnetic wear-resistant steel 216, and the second magnetic steel 213 may be configured to be matched with the bottom wall of the second magnetic wear-resistant steel 217, so as to avoid a gap between the first magnetic wear-resistant steel 216 and the first magnetic steel 212, and a gap between the second magnetic wear-resistant steel 217 and the second magnetic steel 213.

The magnetic field sensor 214 according to embodiments of the present invention may be a plurality of magnetic field sensors distributed in an array.

All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.

The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.