CN108426943B - Variable diameter magnetic flux leakage detection device in pipeline - Google Patents
Variable diameter magnetic flux leakage detection device in pipeline Download PDFInfo
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- CN108426943B CN108426943B CN201810391436.6A CN201810391436A CN108426943B CN 108426943 B CN108426943 B CN 108426943B CN 201810391436 A CN201810391436 A CN 201810391436A CN 108426943 B CN108426943 B CN 108426943B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
Abstract
The invention discloses a variable-diameter pipeline internal magnetic leakage detection device which comprises a variable-diameter supporting device, a magnetic leakage detection probe shoe and a universal wheel walking device. The variable-diameter supporting device supports the magnetic leakage detection probe shoe on the inner wall of the pipe, so that a proper distance is reserved between the magnetic leakage detection probe shoe and the pipe wall to carry out magnetic leakage detection, and the detection effect is guaranteed. Meanwhile, the extension and the contraction of the magnetic leakage detection probe shoe can be actively controlled, and the diameter of the supporting device is adjusted to adapt to different pipe diameters. The magnetic leakage detection probe shoe consists of a detection sensor and a magnetization device and is used for detecting the defects of the pipeline. The universal wheel walking device is used for realizing the passive walking of the detection device in the pipeline. The magnetic leakage detection boot and the universal wheel traveling device are uniformly distributed on the variable-diameter supporting device. The invention realizes the magnetic flux leakage detection of the industrial variable-diameter pipeline and has the advantages of strong pipeline adaptability and convenient control. Meanwhile, the invention can also be connected with a mobile robot in the pipeline to form an automatic pipeline magnetic flux leakage detection system.
Description
The technical field is as follows:
the invention belongs to the field of electromagnetic nondestructive testing, and relates to a variable-diameter device for detecting magnetic flux leakage in a pipeline.
Background art:
the pipeline type water heater is mainly used in the fields of power generation, metallurgy, petroleum, chemical industry, natural gas, urban water heating supply, building, military and the like, bears the transportation work of materials required by human life, production construction, industrial development and the like, and occupies an extremely important position in national economy. In the use process, the problems of mechanical damage, corrosion, fatigue damage, service life and the like inevitably cause the defects of obvious or potential corrosion thinning, holes, cracks and the like of the in-service pipeline, and if the defects are not found and treated in time, the accidents of material leakage are easily caused in the later period, and great loss is brought to property and life safety.
At present, the nondestructive detection of the defects of the pipeline mainly comprises a magnetic flux leakage method, an ultrasonic method, an eddy current method, an electromagnetic ultrasonic method and the like. However, most of industrial pipelines are deeply buried underground or erected at high altitude, detection means are limited, and many detection methods are difficult to realize. For example, ultrasonic testing requires a couplant during testing, which is difficult to achieve inside a pipe. Compared with other conventional pipeline detection methods, the magnetic flux leakage detection method has the advantages of simple principle, no need of coupling agent, easy signal acquisition and processing and the like, and is widely applied to the aspect of industrial pipeline detection.
At present, foreign equipment for pipeline magnetic flux leakage detection is a Pipescan pipeline corrosion magnetic flux leakage detection system of Silverwing company in British. The equipment adopts three types of scanning probes, and is mainly used for detecting the corrosion of the pipeline from the outside of the pipeline. The magnetic leakage detection pipeline pig RoCorrMFL-A developed by the German Rosen company moves along with the pipeline medium, and the detection signal generated by the magnetic leakage sensor is recorded and stored by the internal storage medium, so that the long-distance pipeline defect detection can be realized. The domestic magnetic flux leakage detection device for the pipeline is CN 103712066B, and discloses an external magnetic flux leakage detection device suitable for an industrial pipeline. CN101988902B discloses a testing device comprising a detachable probe, which is equipped with a connection structure, which can test objects with various diameters, and which can also carry ultrasonic and eddy current testing devices. CN 1525140A discloses oil gas pipeline wall thickness and defect detection system, this system through sensor fixing device, can realize parts such as radial coarse adjustment and spring self-adaptation adjustment's axial array measuring probe, realize the magnetic leakage detection of pipeline inner circumference. CN 101819181B discloses pipeline magnetic leakage detection device, CN 101685064B discloses pipeline reducing detection device, and CN 101324477B discloses high-definition pipeline magnetic leakage detection mechanical system. The system belongs to pipeline pig type pipeline magnetic leakage detection equipment, and the principle is that the pressure of liquid or gas in the pipeline to a sealing element is utilized to push a device to move, and the magnetic leakage detection equipment carried on the device is utilized to realize online magnetic leakage detection of a pipeline with large pipe diameter, high pressure and high flow. CN 105181790A discloses a high-efficiency magnetic flux leakage detection device and a detection method thereof, and CN 103837894B discloses a steel pipe magnetic flux leakage detection device and a detection method thereof, wherein the two devices are mainly used for offline magnetic flux leakage detection of small-diameter steel pipes.
Generally speaking, most of the application objects of the current magnetic flux leakage detection equipment for pipelines are pipelines with large diameters, large pipe diameters, high pressures and high flow rates, or pipelines with small diameters for offline detection. And less magnetic flux leakage detection equipment is used for medium-sized and non-high-pressure pipelines. Most of detection equipment can only adapt to pipelines with fixed diameters or adopt a passive reducing mechanism, one kind of equipment is usually used for pipelines with one diameter, a plurality of pieces of equipment are usually needed during reducing pipeline detection, and the pipe diameter adaptability is insufficient. In addition, partial equipment carries out magnetic flux leakage detection on the pipeline from the outside of the pipeline, but the detection depth of the magnetic flux leakage detection is shallow, and the pipeline with thick wall thickness cannot detect the defect close to the inner surface, so that the leakage detection is caused. In addition, most pipelines are buried underground or erected at high altitude, and detection from the outside of the pipelines is difficult.
The invention content is as follows:
in order to solve the technical problem, the invention provides a magnetic flux leakage detection device in a pipeline with variable diameter.
The technical scheme adopted by the invention is as follows: the utility model provides a magnetic leakage detection device in pipeline of variable diameter which characterized in that: the magnetic flux leakage detection device comprises a variable-diameter supporting device, a magnetic flux leakage detection probe shoe and a universal wheel walking device;
the variable-diameter supporting device is used for supporting the magnetic flux leakage detection probe shoe in the pipeline and can actively change the diameter; the variable-diameter supporting device is characterized in that a spring is further added into a connecting rod mechanism connected with the magnetic flux leakage detection probe shoe, so that the connection between the magnetic flux leakage detection probe shoe and the supporting device is flexible, the impact on the supporting device when the probe shoe is in contact with the pipe wall can be reduced, and the magnetic flux leakage detection probe shoe can be in better contact with the pipe wall; the magnetic leakage detection probe shoes are divided into three parts, are uniformly distributed on the variable-diameter supporting device at intervals of 120 degrees and are used for detecting defects in the pipeline; the universal wheel traveling devices are divided into three groups, are uniformly distributed on the variable-diameter supporting device at intervals of 120 degrees, are 60 degrees apart from the magnetic flux leakage detection probe shoe and are used for realizing the passive traveling of the detection device in the pipeline;
the variable-diameter supporting device comprises a hexagonal frame, a front bearing end cover, a front frame cover, a rear bearing end cover, a rear frame cover, a screw coupling, a screw motor base, a screw motor, a main screw, a bearing, a long connecting rod connecting nut, a short connecting rod connecting block, a long connecting pin, a long connecting rod connecting pin head, a long connecting rod, a short connecting rod, a long connecting rod limiting block, a long connecting rod moving rod, a long connecting rod connecting head, a long connecting rod spring, a short connecting pin and a short connecting pin head;
the front frame cover and the rear frame cover are fixed to the front and the rear of the hexagonal frame through a first screw;
the screw motor is fixedly connected to the rear frame cover through a screw motor base, is connected with the main screw through a screw coupling, and transmits power to the main screw with opposite left and right screw threads, wherein two ends of the main screw are connected with the front and rear frame covers through bearings;
the short connecting rod connecting blocks are fixed on two sides of the middle step of the main screw rod through set screws;
the long connecting rod connecting nuts are connected with the main screw rod through threads to form a screw rod nut mechanism, and meanwhile, the left threads and the right threads of the main screw rod are opposite, so that the long connecting rod connecting nuts on two sides can be close to or far away from the main screw rod at the same time when the main screw rod rotates;
the long connecting rod is connected with the long connecting rod connecting nut through the long connecting pin and the long connecting rod connecting pin head, the short connecting rod is connected with the short connecting rod connecting block through the long connecting pin and the long connecting rod connecting pin head, and the long connecting rod is connected with the short connecting rod through the short connecting pin and the short connecting pin head to form a connecting rod mechanism;
the long connecting rod limiting block is connected with the long connecting rod through threads, the long connecting rod moving rod moves in the through structure at one end of the long connecting rod and is limited by the long connecting rod limiting block, the long connecting rod cannot fall out of the long connecting rod, the long connecting rod connector is connected with the long connecting rod moving rod through threads and is used for connecting the magnetic leakage detection boots, springs are arranged between the long connecting rod connector and the long connecting rod to form a spring slider mechanism which is used for increasing the flexibility of connection between the magnetic leakage detection boots and the rack, the detection boots are enabled to be floating at the same time, and the contact tightness between the detection boots and the pipe wall is improved;
the long connecting rod connector is connected with the magnetic leakage detection boot through a short connecting pin and a short connecting pin head;
in the variable-diameter pipeline internal magnetic leakage detection device, the pipeline internal magnetic leakage detection probe shoe comprises an arc-shaped magnetizing device, a sensor fixing device, a magnetic leakage detection sensor and a wear-resistant isolation layer;
the radian of the arc-shaped magnetizing device is set to be 60 degrees, the pipeline range of 180 degrees of the inner circumference of the pipeline can be detected under the condition of setting 3 devices, and after one-time detection, 360 degrees of the inner circumference of the pipeline can be detected by changing the posture of the detection device.
The sensor fixing device is fixed in the arc-shaped groove of the arc-shaped magnetizing device;
the magnetic flux leakage detection sensor is fixed in 5 grooves of the cambered surface of the sensor fixing device;
the wear-resistant isolation layer is attached to the outer side of the arc surface of the arc-shaped magnetizing device and used for isolating the arc-shaped magnetizing device from the pipeline and avoiding the direct contact between the magnetizing device and the pipeline.
In the magnetic flux leakage detection device in the pipeline with the variable diameter, the universal wheel traveling device comprises a wheel connecting frame, a wheel connecting rod, a wheel limiting block, a wheel moving rod, a wheel spring and a universal wheel;
the wheel connecting frame is connected with the hexagonal rack of the variable-diameter supporting device through a screw, and the wheel connecting rod is connected with the wheel connecting frame through a second screw;
the wheel stopper passes through screw thread and wheel connecting rod, and the wheel carriage release lever receives the spacing of wheel stopper simultaneously at the well through structure internal motion of wheel connecting rod one end, is unlikely to deviate from in the wheel carriage release lever, and the wheel carriage release lever passes through the nut fastening with the universal wheel, is equipped with the spring between wheel connecting rod and the wheel carriage release lever for support the universal wheel on the pipe wall, when simultaneously detection device passes through the reducing pipeline, the passive reducing of flexible realization of accessible spring.
The invention has the beneficial effects that: 1. the variable-diameter supporting device supports the magnetic leakage detection probe shoe on the inner wall of the pipeline, and the device can realize active diameter change under the control of a motor, so that the pipe diameter adaptation range of the magnetic leakage detection device is improved, the distance between the probe shoe and the pipe wall during magnetic leakage detection can be ensured, and the detection precision is improved; 2. the spring slider mechanism is added at the rear end of the long connecting rod of the variable-diameter supporting device, the flexibility of connection of the magnetic leakage detection shoe and the variable-diameter supporting device is increased, the rigid impact on the variable-diameter supporting device when the magnetic leakage detection shoe is in contact with the pipe wall can be reduced, meanwhile, the spring slider mechanism enables the magnetic leakage detection shoe to be floating, and the contact tightness between the detection shoe and the pipe wall is improved. 3. The magnetic leakage detection boots adopt an arc design, are more uniform with the interval of the pipe wall, improve the magnetization effect of the magnetization device on the pipe wall, have the radian of 60 degrees simultaneously, and after the detection is once, the posture of the magnetic leakage detection device is changed, and the detection of 360 degrees of the pipe wall can be realized. 4. The universal wheel traveling devices are divided into 3 universal wheel traveling devices which are uniformly distributed on the diameter-variable supporting device at intervals of 120 degrees, a spring slider mechanism is further arranged between the universal wheel and the diameter-variable supporting device, and passive diameter changing can be realized through the stretching of a spring when the detection device passes through the diameter-variable pipeline.
Description of the drawings:
fig. 1 is a perspective view of the overall structure of the embodiment of the present invention.
Fig. 2 is a perspective view showing an assembly relationship of the variable diameter supporting device, the magnetic flux leakage detection probe shoe, and the universal wheel traveling device according to the embodiment of the present invention.
Fig. 3 is a structural perspective view of a variable diameter supporting device according to an embodiment of the present invention.
Fig. 4 is a perspective view showing the structure of each part of the variable diameter supporting device according to the embodiment of the present invention.
Fig. 5 is a perspective view of a link mechanism of the variable diameter support device according to the embodiment of the present invention.
Fig. 6 is a perspective view of a slider mechanism of the variable diameter support device according to the embodiment of the present invention.
Fig. 7 is a perspective view of the leakage detecting probe shoe according to the embodiment of the present invention.
Fig. 8 is a perspective view showing the structure of each part of the leakage detecting probe shoe according to the embodiment of the present invention.
Fig. 9 is a perspective view of the structure of the universal wheel traveling device according to the embodiment of the present invention.
Fig. 10 is a perspective view showing the structure of each part of the universal wheel traveling apparatus according to the embodiment of the present invention.
In the figure: 1. variable diameter support device, 2, magnetic leakage detection probe shoe, 3, universal wheel traveling device, 101, front bearing end cover, 102, front frame cover, 103, hexagonal frame, 104, main screw, 105, long link nut, 106, long link, 107, short link, 108, short link connecting block, 109, rear frame cover, 110, rear bearing end cover, 111, screw motor base, 112, screw coupler, 113, screw motor, 114, long link spring, 115, long link connector, 116, long link moving rod, 117, long link stopper, 118, short connecting pin head, 119, short connecting pin, 120, long connecting pin, 121, long connecting pin head, 122, bearing, 123, screw, 201, arc magnetization device, 202, wear-resistant isolation layer, 203, sensor fixing device, 204, magnetic leakage detection sensor, 301, wheel connecting frame, 302, wheel connecting rod, 303, magnetic leakage detection sensor, 102, front connecting rod, long connecting rod, and long connecting rod, Wheel spring 304, wheel limiting block 305, wheel moving rod 306, universal wheel 307, screw 308 and nut.
The specific implementation scheme is as follows:
for the convenience of those skilled in the art to understand and practice the present invention, the following detailed description is given with reference to the accompanying drawings and the embodiments, it being understood that the embodiments described herein are only for the purpose of illustration and explanation and are not intended to limit the present invention.
Referring to fig. 1 and 2, the magnetic leakage detection device in a pipeline with a variable diameter provided by the invention comprises a variable diameter supporting device 1, a magnetic leakage detection probe shoe 2 and a universal wheel walking device 3; the variable-diameter supporting device 1 is used for supporting the magnetic leakage detection probe shoe 2 in a pipeline, has the characteristic of active diameter change, and enables the connection between the magnetic leakage detection probe shoe 2 and the variable-diameter supporting device 1 to be flexible; the magnetic leakage detection probe shoes 2 are divided into three parts, are uniformly distributed on the variable-diameter supporting device 1 at intervals of 120 degrees and are used for detecting defects in a pipeline; the universal wheel traveling devices 3 are divided into three groups, are uniformly distributed on the variable-diameter supporting device 1 at intervals of 120 degrees, are separated from the magnetic leakage detection probe shoe 2 at intervals of 60 degrees, and are used for realizing the passive traveling of the detection device in the pipeline.
Referring to fig. 3, 4, 5 and 6, the diameter-variable supporting device 1 of the present invention includes a front bearing end cover 101, a front frame cover 102, a hexagonal frame 103, a main screw 104, a long link nut 105, a long link 106, a short link 107, a short link connecting block 108, a rear frame cover 109, a rear bearing end cover 110, a screw motor base 111, a screw coupler 112, a screw motor 113, a long link spring 114, a long link connector 115, a long link moving rod 116, a long link stopper 117, a short connecting pin 118, a short connecting pin 119, a long connecting pin 120, and a long link connecting pin 121; the front frame cover 102 and the rear frame cover 109 are fixed in front of and behind the hexagonal frame 103 through a first screw 123; a screw motor 113 is fixedly connected to the rear frame cover 109 through a screw motor base 111, is connected with the main screw 104 through a screw coupling 112, and transmits power to the main screw 104 with opposite left and right screw threads, wherein two ends of the main screw 104 are connected with the front frame cover 102 and the rear frame cover 109 through bearings 122; the short connecting rod connecting block 108 is fixed on two sides of the middle step of the main lead screw 104 through a set screw; the long connecting rod connecting nuts 105 are connected with the main screw 104 through threads to form a screw nut mechanism, and meanwhile, as the left threads and the right threads of the main screw 104 are opposite, the long connecting rod connecting nuts 105 on two sides can be close to or far away from each other simultaneously when the main screw rotates; the long connecting rod 106 is connected with the long connecting rod connecting nut 105 through the long connecting pin 120 and the long connecting rod connecting pin head 121, the short connecting rod 107 is connected with the short connecting rod connecting block 108 through the long connecting pin 120 and the long connecting rod connecting pin head 121, and the long connecting rod 106 is connected with the short connecting rod 107 through the short connecting pin 119 and the short connecting pin head 118 to form a connecting rod mechanism; the long connecting rod limiting block 117 is connected with the long connecting rod 106 through threads, the long connecting rod moving rod 116 moves in a through structure at one end of the long connecting rod 106 and is limited by the long connecting rod limiting block 117, the long connecting rod connecting head 115 is connected with the long connecting rod moving rod 116 through threads and is used for connecting the magnetic leakage detection boots, the spring 114 is arranged between the long connecting rod connecting head 115 and the long connecting rod 106, the spring slider mechanism is formed by the components together and is used for increasing the flexibility of connection between the magnetic leakage detection boots and the rack, meanwhile, the detection boots are enabled to be floating, and the contact tightness between the detection boots and the pipe wall is improved; the long link joint 115 is connected to the magnetic leakage detecting probe shoe 2 via a short connecting pin 119 and a short connecting pin head 118.
Referring to fig. 7 and 8, the magnetic leakage detecting device 2 of the present invention includes an arc-shaped magnetizing device 201, a sensor fixing device 203, a magnetic leakage detecting sensor 204, and a wear-resistant isolation layer 202; the sensor fixing device 203 is fixed in the arc-shaped groove of the arc-shaped magnetizing device 201; the magnetic leakage detection sensor 204 is fixed in 5 grooves of the cambered surface of the sensor fixing device 203; the wear-resistant isolation layer 202 is attached to the outside of the arc 201 surface of the arc-shaped magnetizing device and used for isolating the arc-shaped magnetizing device 201 from a pipeline and avoiding direct contact between the magnetizing device and the pipeline.
Referring to fig. 9 and 10, the universal wheel traveling device of the present invention includes a wheel connecting frame 301, a wheel connecting rod 302, a wheel limiting block 304, a wheel moving rod 305, a wheel spring 303, and a universal wheel 306; the wheel connecting frame 301 is connected with the hexagonal frame 103 of the variable-diameter supporting device through a second screw 307, and the wheel connecting rod 302 is connected with the wheel connecting frame 301 through a 308 screw; wheel stopper 304 passes through screw thread and wheel connecting rod 302, wheel carriage release lever 305 moves in the well logical structure of wheel connecting rod 302 one end, receive wheel stopper 304's spacing simultaneously, be unlikely to deviate from in the wheel carriage release lever 302, wheel carriage release lever 305 passes through nut 308 with universal wheel 306 and fastens, be equipped with spring 303 between wheel connecting rod 302 and the wheel carriage release lever 305, be used for supporting universal wheel 306 on the pipe wall, when detection device passes through the reducing pipeline simultaneously, passive reducing is realized to the flexible of accessible spring.
The working principle of the invention is as follows:
the invention is used for detecting the magnetic flux leakage in the pipeline, and the equipment is unpowered magnetic flux leakage detection equipment, and after the front frame cover 102 is provided with a universal joint and other connecting devices, the equipment can be dragged in the pipeline by manpower or a pipeline moving robot to move.
In the straight pipe, the central axis of the magnetic flux leakage detection device in the variable-diameter pipeline coincides with the axis of the pipeline, and the robot can move in the straight pipe by manpower or power provided by a mobile robot in the pipeline by taking the universal wheel walking device 3 as a walking mechanism. When meeting in intraductal environment such as reducing pipe, obstacle, return bend, universal wheel running gear 2 draws close to the pipeline axle center under the effect of external force, and wheel carriage release lever 305 removes in the well logical structure of wheel connecting rod 302 one end, and wheel spring 303 compresses, and universal wheel running gear adapts to the pipe diameter under the effect of external force. After the robot walks through the reducer pipe, the obstacle and the bent pipe, the wheel moving rod 305 and the wheel spring 303 are restored, the universal wheel traveling device 2 is unfolded, and the robot continues to travel in the pipeline.
When the magnetic flux leakage detection device in the variable-diameter pipeline does not perform detection, the lead screw motor 113 drives the main lead screw 104 to move through the lead screw coupler 112, and the long connecting rod nut 105 is adjusted to move outwards at the same time; the long connecting rod nut 105 drives a connecting rod mechanism consisting of a long connecting rod 106, a short connecting rod 107 and the like to fold the magnetic leakage detection shoe 2, so that the magnetic leakage detection shoe 2 is prevented from influencing the movement of the robot. When the magnetic leakage detection device in the variable-diameter pipeline detects, the screw motor 113 drives the main screw 104 to move through the screw coupling 112, the long connecting rod nut 105 is adjusted to move inwards at the same time, the connecting rod mechanism extends the magnetic leakage detection probe shoe 2, and the magnetic leakage detection probe shoe 2 is supported on the pipe wall to perform magnetic leakage detection.
Although the variable diameter support device 1, the magnetic leakage detection probe shoe 2, the universal wheel traveling device 3, the front bearing cover 101, the front frame cover 102, the hexagonal frame 103, the main screw 104, the long link nut 105, the long link 106, the short link 107, the short link connecting block 108, the rear frame cover 109, the rear bearing cover 110, the screw motor base 111, the screw coupling 112, the screw motor 113, the long link spring 114, the long link connecting head 115, the long link moving rod 116, the long link stopper 117, the short connecting pin head 118, the short connecting pin 119, the long connecting pin 120, the long link connecting pin head 121, the bearing 122, the screw one 123, the arc-shaped magnetization device 201, the wear-resistant isolation layer 202, the sensor fixing device 203, the magnetic leakage detection sensor 204, the wheel link 301, the wheel connecting rod 302, the wheel spring 303, the wheel stopper 304, the wheel moving rod 305, the wheel moving rod, Universal wheel 306, screw two 307, nut 308, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe the nature of the invention and they are to be construed as any additional limitation which is not in accordance with the spirit of the invention.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. The utility model provides a magnetic leakage detection device in pipeline of variable diameter which characterized in that: comprises a diameter-variable supporting device (1), a magnetic flux leakage detection probe shoe (2) and a universal wheel traveling device (3);
the variable-diameter supporting device (1) is used for supporting the magnetic leakage detection probe shoe (2) in a pipeline and can actively change the diameter; the variable-diameter supporting device (1) is also provided with a spring (114) in a connecting rod mechanism connected with the magnetic leakage detection probe shoe (2), so that the connection between the magnetic leakage detection probe shoe (2) and the supporting device (1) is flexible, the impact on the supporting device when the probe shoe (2) is in contact with the pipe wall can be reduced, and the magnetic leakage detection probe shoe (2) can be in better contact with the pipe wall; the magnetic leakage detection probe shoes (2) are divided into three parts, are uniformly distributed on the variable-diameter supporting device (1) at intervals of 120 degrees and are used for detecting defects in the pipeline; the universal wheel traveling devices (3) are divided into three groups, are uniformly distributed on the variable-diameter supporting device (1) at intervals of 120 degrees and are 60 degrees away from the magnetic leakage detection probe shoe (2) for realizing the passive traveling of the detection device in the pipeline;
the variable-diameter supporting device comprises a hexagonal frame (103), a front bearing end cover (101), a front frame cover (102), a rear bearing end cover (110), a rear frame cover (109), a screw shaft coupler (112), a screw shaft motor base (111), a screw shaft motor (113), a main screw (104), a bearing (122), a long connecting rod connecting nut (105), a short connecting rod connecting block (108), a long connecting pin (120), a long connecting rod connecting pin head (121), a long connecting rod (106), a short connecting rod (107), a long connecting rod limiting block (117), a long connecting rod moving rod (116), a long connecting rod connecting head (115), a long connecting rod spring (114), a short connecting pin (119) and a short connecting pin head (118);
the front frame cover (102) and the rear frame cover (109) are fixed to the front and the rear of the hexagonal frame (103) through a first screw (123);
the screw motor (113) is fixedly connected to the rear frame cover (109) through a screw motor base (111), is connected with the main screw (104) through a screw coupling (112), and transmits power to the main screw (104) with opposite left and right screw threads, wherein two ends of the main screw (104) are connected with the front frame cover (102) and the rear frame cover (109) through bearings (122);
the short connecting rod connecting block (108) is fixed on two sides of a middle step of the main lead screw (104) through a set screw;
the long connecting rod connecting nuts (105) are connected with the main lead screw (104) through threads to form a lead screw nut mechanism, and meanwhile, as the left threads and the right threads of the main lead screw are opposite, the long connecting rod connecting nuts (105) on two sides can be close to or far away from each other simultaneously when the main lead screw (104) rotates;
the long connecting rod (106) is connected with the long connecting rod connecting nut (105) through a long connecting pin (120) and a long connecting rod connecting pin head (121), the short connecting rod (107) is connected with the short connecting rod connecting block (108) through the long connecting pin (120) and the long connecting rod connecting pin head (121), and the long connecting rod (106) is connected with the short connecting rod (107) through a short connecting pin (119) and a short connecting pin head (118) to form a connecting rod mechanism;
the long connecting rod limiting block (117) is connected with the long connecting rod (106) through threads, the long connecting rod moving rod (116) moves in the through structure at one end of the long connecting rod (106) and is limited by the long connecting rod limiting block (117) to be prevented from falling out of the long connecting rod (106), the long connecting rod connector (115) is connected with the long connecting rod moving rod (116) through threads and is used for connecting the magnetic leakage detection boot (2), a spring is arranged between the long connecting rod connector (115) and the long connecting rod (106) to form a spring slider mechanism, the flexibility of the connection between the magnetic leakage detection boot (2) and the hexagonal rack (103) is increased, the floating detection boot is changed into a floating type detection boot, and the contact tightness between the pipe wall and the detection boot is improved;
and the long connecting rod connector (115) is connected with the magnetic flux leakage detection probe shoe (2) through a short connecting pin (119) and a short connecting pin head (118).
2. The variable diameter magnetic flux leakage detection device in a pipeline according to claim 1, wherein: the magnetic leakage detection probe shoe (2) in the pipeline comprises an arc-shaped magnetizing device (201), a sensor fixing device (203), a magnetic leakage detection sensor (204) and a wear-resistant isolation layer (202);
the radian of the arc-shaped magnetizing device (201) is set to be 60 degrees, the pipeline range of 180 degrees of the inner circumference of the pipeline can be detected under the condition of setting 3 devices, and after one-time detection, the 360-degree detection of the inner circumference of the pipeline can be realized by changing the posture of the detection device;
the sensor fixing device (203) is fixed in an arc-shaped groove of the arc-shaped magnetizing device (201);
the magnetic leakage detection sensor (204) is fixed in 5 grooves of the cambered surface of the sensor fixing device (203);
the wear-resistant isolation layer (202) is attached to the outside of the arc surface of the arc-shaped magnetizing device (201) and used for isolating the arc-shaped magnetizing device from a pipeline and avoiding direct contact between the magnetizing device and the pipeline.
3. The variable diameter magnetic flux leakage detection device in a pipeline according to claim 1, wherein: the universal wheel walking device (3) comprises a wheel connecting frame (301), a wheel connecting rod (302), a wheel limiting block (304), a wheel moving rod (305), a wheel spring (303) and a universal wheel (306);
the wheel connecting frame (301) is connected with the hexagonal rack (103) of the variable-diameter supporting device (1) through a second screw (307), and the wheel connecting rod (302) is connected with the wheel connecting frame (301) through a second screw;
wheel stopper (304) are through screw thread and wheel connecting rod (302), wheel carriage release lever (305) are at the well through structure internal motion of wheel connecting rod (302) one end, receive the spacing of wheel stopper (304) simultaneously, be unlikely to deviate from in wheel carriage release lever (305), wheel carriage release lever (305) and universal wheel (306) are through nut (308) fastening, be equipped with the spring between wheel connecting rod (302) and wheel carriage release lever (305), be used for supporting universal wheel (306) on the pipe wall, when detection device passes through the reducing pipeline simultaneously, the passive reducing of flexible realization of accessible spring.
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| CN201810391436.6A CN108426943B (en) | 2018-04-27 | 2018-04-27 | Variable diameter magnetic flux leakage detection device in pipeline |
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| CN201810391436.6A CN108426943B (en) | 2018-04-27 | 2018-04-27 | Variable diameter magnetic flux leakage detection device in pipeline |
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| CN109342550A (en) * | 2018-09-17 | 2019-02-15 | 西华大学 | Small diameter pipeline leakage magnetic detection device |
| CN109253342A (en) * | 2018-11-13 | 2019-01-22 | 安徽理工大学 | A kind of pipe walking robot |
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