CN109187735B - In-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism and detection method - Google Patents
In-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism and detection method Download PDFInfo
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- CN109187735B CN109187735B CN201811331681.4A CN201811331681A CN109187735B CN 109187735 B CN109187735 B CN 109187735B CN 201811331681 A CN201811331681 A CN 201811331681A CN 109187735 B CN109187735 B CN 109187735B
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- 238000001514 detection method Methods 0.000 title claims abstract description 106
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 74
- 230000007246 mechanism Effects 0.000 title claims abstract description 64
- 230000007547 defect Effects 0.000 title claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 87
- 238000004140 cleaning Methods 0.000 claims abstract description 61
- 230000000007 visual effect Effects 0.000 claims abstract description 43
- 239000000523 sample Substances 0.000 claims abstract description 22
- 239000002872 contrast media Substances 0.000 claims description 40
- 239000007921 spray Substances 0.000 claims description 33
- 239000000725 suspension Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
- 230000006378 damage Effects 0.000 claims description 17
- 230000005291 magnetic effect Effects 0.000 claims description 17
- 208000027418 Wounds and injury Diseases 0.000 claims description 14
- 208000014674 injury Diseases 0.000 claims description 14
- 239000000375 suspending agent Substances 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 10
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 abstract description 4
- 238000012790 confirmation Methods 0.000 abstract description 2
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- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
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- 210000001503 joint Anatomy 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 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
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Abstract
The invention discloses an in-service long pipeline girth weld defect magnetic powder internal detection mechanism and a detection method, and relates to the technical field of butt weld nondestructive inspection, comprising a central pipe, a fixed seat fixedly sleeved on two ends of the central pipe and a rotating mechanism rotatably sleeved on two ends of the central pipe; the two fixing seats are provided with travelling wheels; a mounting frame is further connected between the two rotating mechanisms, and cleaning devices, high-definition visual acquisition devices and automatic magnetic powder detection devices are uniformly arranged at intervals in the circumferential direction of the mounting frame; the head of the central tube is also fixedly provided with a welding seam identification probe. According to the invention, the circumferential weld is automatically identified, automatically propelled and positioned, the axial rotation is carried out to carry out deviation scanning confirmation on the weld, and the posture is adjusted through the lifting mechanism of the travelling wheel, so that the weld and the rotating mechanism are accurately positioned, and the guarantee is provided for the next detection; and the adaptability is strong, and the optimal effect is achieved.
Description
Technical Field
The invention relates to the technical field of butt weld nondestructive inspection, in particular to an in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism and a detection method.
Background
According to the research of fatigue defects, the initiation and the expansion of fatigue cracks are of great significance, the fatigue damage often generates sudden brittle fracture in a stress state with a load lower than an allowable value, no obvious plastic deformation exists before the fatigue damage, the state of stress concentration before the crack cannot be detected by the current magnetic leakage detection technology, and therefore, the defects often bring unexpected disastrous accidents to people. In recent years, a plurality of welding seam cracking accidents occur in the oil and gas pipeline, wherein cracks are not yet detected and reduced through detection means. The damage form is not only in the oil and gas pipeline industry, but also in aerospace, ships, transportation, high-speed rails, bridges, power machines and the like.
The defects of more than 80% of long pipeline are all at the butt joint girth joint of the pipeline, the detection rate and the identification rate of the traditional home and abroad nondestructive inspection method are low (less than 60%), the requirements of production operation can not be met far, and therefore, the detection of the single defects of the girth joint in a targeted manner becomes necessary.
Disclosure of Invention
The invention aims to provide an in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism and a detection method, so that the detection rate and the identification rate of pipeline girth welds are greatly improved (> 95%).
In order to achieve the aim of the invention, the technical scheme adopted is as follows: the in-service long pipeline girth weld defect magnetic powder internal detection mechanism comprises a central pipe, a fixed seat fixedly sleeved on two ends of the central pipe and a rotating mechanism rotatably sleeved on two ends of the central pipe; the two fixing seats are provided with travelling wheels; a mounting frame is further connected between the two rotating mechanisms, and cleaning devices, high-definition visual acquisition devices and automatic magnetic powder detection devices are uniformly arranged at intervals in the circumferential direction of the mounting frame; the head of the central tube is also fixedly provided with a welding seam identification probe.
Further, two all be provided with a plurality of walking wheel brackets on the fixing base, a plurality of walking wheel brackets are evenly spaced along the circumferencial direction of fixing base and are arranged, and a plurality of walking wheels are installed on a plurality of walking wheel brackets respectively one by one.
Furthermore, the head of the central tube is fixedly sleeved with a mounting head; the welding seam identification probes are distributed at equal intervals along the circumferential direction of the mounting head.
Furthermore, two mounting plates are fixedly sleeved on the central tube, and two rotating mechanisms are respectively mounted on the two mounting plates.
Further, the outer sides of the two mounting plates are fixedly provided with limiting plates, and the end parts of the rotating mechanisms are propped against the limiting plates.
Further, the two rotating mechanisms comprise inner rings sleeved on the mounting plate and gear rings fixedly mounted on the inner walls of the inner rings, and two ends of the mounting frame are respectively fixed on the two inner rings.
Further, at least one first driving motor is installed on each installation disc, driving gears are installed on output shafts of the plurality of first driving motors, and the plurality of driving gears are meshed with the gear ring together.
Further, the mounting frame comprises a plurality of connecting frames which are uniformly distributed at intervals along the circumferential direction of the inner rings, two ends of the plurality of connecting frames are respectively fixed with the two inner rings, and the cleaning device, the high-definition visual acquisition device and the automatic magnetic powder detection device are respectively arranged on the plurality of connecting frames one by one; the two ends of the connecting frames are respectively sleeved with an outer ring together.
Further, the cleaning device comprises a second driving motor and a polishing control power supply which are fixedly arranged on the connecting frame, and the second driving motor is respectively connected with the polishing control power supply and the output end of the main control box; and the output shaft of the second driving motor is fixedly provided with a cleaning wheel.
Further, the high-definition visual acquisition device comprises a high-definition camera and a camera control power supply which are fixedly arranged on the connecting frame, the high-definition camera is connected with the output end of the camera control power supply, and the high-definition camera is in bidirectional connection with the main control box.
Further, the automatic magnetic powder detection device comprises a fixed plate, a magnetic powder injury control instrument, a suspension and contrast agent controller which are fixedly arranged on the connecting frame; the suspension spray gun and the contrast agent spray gun are fixedly arranged on the fixing plate, a magnetic suspension hydraulic cylinder and a contrast agent cylinder are fixedly arranged on the outer side of each outer ring, the magnetic suspension hydraulic cylinder is communicated with the magnetic suspension hydraulic cylinder, and the contrast agent cylinder is communicated with the contrast agent spray gun; the suspension spray gun and the contrast agent spray gun are connected with the output ends of the suspension and contrast agent controller; the automatic magnetic powder detection controller is fixedly arranged on the fixing plate, and the magnetic powder injury control instrument is connected with the output end of the automatic magnetic powder detection controller.
A detection method of an in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism comprises the following specific detection steps:
(1) The detection device is sent into the pipeline, and the travelling wheel starts to rotate, so that the detection device advances in the pipeline;
(2) In the advancing process of the detection device, the welding seam identification probe identifies the welding seam in the pipeline, the travelling wheel continues to rotate after the welding seam identification probe identifies the welding seam, so that the detection device continues to advance in the pipeline, and when the cleaning device, the high-definition visual acquisition device and the automatic magnetic powder detection device are aligned with the welding seam, the travelling wheel stops rotating, so that the detection mechanism stops advancing in the pipeline;
(3) The high-definition visual acquisition device acquires, and simultaneously, the two rotating mechanisms rotate simultaneously during acquisition, so that the high-definition visual acquisition device circumferentially acquires the welding line;
(4) After the high-definition visual acquisition device finishes acquisition, the cleaning device starts to clean the welding line, and in the cleaning process, the cleaning device is enabled to complete the cleaning of the whole welding line along with the rotation of the two rotating mechanisms;
(5) After the cleaning device cleans the welding seam, the automatic magnetic powder detection device starts to magnetize the welding seam locally, at the moment, the two rotating mechanisms rotate simultaneously, so that the automatic magnetic powder detection device performs circumference detection on the welding seam, and the whole welding seam is magnetized;
(6) After the welding seam is magnetized, the high-definition visual acquisition device detects the magnetized welding seam, and acquires, stores and processes the detected image.
The invention has the advantages that,
1. the invention applies a magnetic field to the detected workpiece to magnetize the detected workpiece, magnetic lines of force are allowed to escape from the surface of the detected workpiece at the defects of the surface and the near surface of the workpiece to form a leakage magnetic field, and magnetic powder applied to the surface of the workpiece is adsorbed by the existence of magnetic poles to form a concentrated magnetic mark, so that the defects are displayed; the invention has the advantages that the detection sensitivity of the surface and near-surface defects of the ferromagnetic material is highest, the detection speed is higher, the defects at the circumferential weld which are difficult to detect and identify can be directly detected by the automatic magnetic powder detection system, the use is very convenient, the pertinence is strong, and the detection rate and the identification rate are greatly improved;
2. according to the invention, the circumferential weld is automatically identified, automatically propelled and positioned, the axial rotation is carried out to carry out deviation scanning confirmation on the weld, and the posture is adjusted through the lifting mechanism of the travelling wheel, so that the weld and the rotating mechanism are accurately positioned, and the guarantee is provided for the next detection; and the adaptability is strong, and the optimal effect is achieved.
Drawings
FIG. 1 is a perspective view of an in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism provided by the invention;
FIG. 2 is a perspective view of the in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism provided by the invention 2
FIG. 3 is a block diagram of the rotational mechanism and mounting bracket of FIG. 1;
FIG. 4 is a block diagram of the rotary mechanism of FIG. 4;
fig. 5 is a structural view of the mounting bracket of fig. 4.
The reference numerals and corresponding part names in the drawings:
1. the device comprises a central tube, 2, a fixed seat, 3, a rotating mechanism, 4, travelling wheels, 5, a mounting rack, 6, a cleaning device, 7, a high-definition visual acquisition device, 10, an automatic magnetic powder detection device, 12, a weld joint identification probe, 13, a travelling wheel bracket, 14, a mounting head, 15, a mounting disc, 16 and a limiting disc;
31. the inner ring, 32, the gear ring, 33, the first driving motor, 34 and the driving gear;
51. a connecting frame 52 and an outer ring;
61. the second driving motor, 62, polishing control power, 63, cleaning wheel;
71. the high-definition camera, 72, camera control power;
101. a fixed plate, 102, a magnetic powder injury control instrument, 103, a suspension and contrast agent controller, 104, an automatic magnetic powder detection controller, 105, a suspension spray gun, 106, a contrast agent spray gun, 107, a magnetic suspension cylinder, 108 and a contrast agent cylinder.
Detailed Description
The invention will now be described in further detail by way of specific examples of embodiments in connection with the accompanying drawings.
Fig. 1 to 5 show an in-service long pipeline girth weld defect magnetic powder internal detection mechanism provided by the invention, which comprises a central tube 1, a fixed seat 2 fixedly sleeved on two ends of the central tube 1 and a rotating mechanism 3 rotatably sleeved on two ends of the central tube 1; the two fixed seats 2 are provided with travelling wheels 4; a mounting frame 5 is further connected between the two rotating mechanisms 3, and cleaning devices 6, high-definition visual acquisition devices 7 and automatic magnetic powder detection devices 10 are uniformly arranged at intervals in the circumferential direction of the mounting frame 5; the head of the central tube 1 is also fixedly provided with a weld joint identification probe 12.
The central tube 1 is a hollow tube, the fixed seat 2 is disc-shaped, the fixed seat 2 and the central tube 1 can be directly welded or fixed by adopting key connection, and the travelling wheel 4 is rotatably supported on the fixed seat 2; the two fixing seats 2 and the two rotating mechanisms 3 are symmetrically arranged along the middle part of the central tube 1; the two ends of the mounting frame 5 are respectively fixed with the two rotating mechanisms 3, and the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 are all arranged on the same circular ring; and cleaning device 6, high definition visual collection system 7, automatic magnetic powder detection device 10 all are located the middle part of mounting bracket 5, and cleaning device 6, high definition visual collection system 7, automatic magnetic powder detection device 10 all equal to the distance at mounting bracket 5 both ends promptly.
The welding seam identification probe 12 is a KE-H60Q12 infrared probe and is used for identifying welding seams; the cleaning device 6 is used for cleaning the welding seam, so that the position of the welding seam is cleaner and clearer; the high-definition visual acquisition device 7 is used for carrying out image recognition on the condition and the position of the welding line; the automatic magnetic powder detection device 10 is used for detecting defects of welding seams. The model of the travelling wheel 4 is 24V750W, and the travelling wheel 4 is provided with a driving motor, namely, the travelling wheel 4 does not need an additional driving motor to drive the travelling wheel 4. The rotating mechanism 3, the travelling wheel 4, the cleaning device 6, the high-definition visual acquisition device 7, the automatic magnetic powder detection device 10 and the welding seam identification probe 12 send signals, so that the rotating mechanism 3, the travelling wheel 4, the cleaning device 6, the high-definition visual acquisition device 7, the automatic magnetic powder detection device 10 and the welding seam identification probe 12 make corresponding work after receiving the signals, and automatic detection of the welding seam of the pipeline is realized.
Two all be provided with a plurality of walking wheel brackets 13 on the fixing base 2, a plurality of walking wheel brackets 13 are evenly spaced along the circumferencial direction of fixing base 2 and are arranged, and a plurality of walking wheels 4 are installed on a plurality of walking wheel brackets 13 respectively one by one. The plurality of travelling wheels 4 are fixedly arranged on the fixed seats 2 through screws, the quantity of the travelling wheel brackets 13 on the two fixed seats 2 is equal, and the installation positions of the travelling wheel brackets 13 on the two fixed seats 2 are the same, so that the travelling wheels 4 positioned at the two ends of the central tube 1 are symmetrically arranged, and the detection device is more stable in the advancing process.
The head of the central tube 1 is also fixedly sleeved with a mounting head 14; the number of the weld joint identification probes 12 is plural, and the plural weld joint identification probes 12 are uniformly arranged at intervals along the circumferential direction of the mounting head 14. The head of the central tube 1 is the end of the central tube 1 which enters the pipeline in the use process of the detection device, the tail of the central tube 1 is the end far away from the head of the central tube 1, and specifically, the mounting head 14 and the central tube 1 can be welded or connected and fixed by a key. The weld joint identification probe 12 can be fixed or embedded on the mounting heads 14 through screws or welding, and can identify the whole circumferential direction of the weld joint through the cooperation of a plurality of the mounting heads 14, so that the accuracy of weld joint identification is higher, and the accurate positioning of the weld joint is realized.
The central tube 1 is fixedly sleeved with two mounting plates 15, and the two rotating mechanisms 3 are respectively mounted on the two mounting plates 15. Two along center tube 1 symmetry is arranged, and two mounting panels 15 can direct welding or be fixed with center tube 1 through key connection, and two slewing mechanism 3 rotate on two mounting panels 15 respectively, through the rotation of two slewing mechanism 3 to drive mounting bracket 5 jointly and rotate, make cleaning device 6, high definition visual collection system 7, automatic magnetic powder detection device 10 on mounting bracket 5 rotate along with the rotation of mounting bracket 5, thereby realize carrying out circumference detection to the welding seam at the circumferencial direction, make the detection of welding seam more accurate.
The outer sides of the two mounting plates 15 are fixedly provided with limiting plates 16, and the end parts of the rotating mechanism 3 are propped against the limiting plates 16. The limiting disc 16 is annular, the small diameter of the limiting disc 16 is smaller than the large diameter of the mounting disc 15, the large diameter of the limiting disc 16 is larger than the large diameter of the mounting disc 15, the limiting disc 16 is fixedly connected with the mounting disc 15 through screws, and the limiting disc 16 is used for limiting the outer sides of the two rotating mechanisms 3, the two limiting discs 16 can be used for limiting the axial distance of the mounting frame 5 respectively, the axial positions of the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 on the mounting frame 5 are fixed, the mounting frame 5 generates axial displacement along with the rotating mechanism 3, and the detection accuracy is higher.
Both the rotating mechanisms 3 comprise an inner ring 31 sleeved on the mounting plate 15 and a gear ring 32 fixedly mounted on the inner wall of the inner ring 31, and two ends of the mounting frame 5 are respectively fixed on the two inner rings 31. The small diameter of the inner ring 31 is in clearance fit with the large diameter of the mounting plate 15, so that the inner ring 31 can sufficiently rotate on the mounting plate 15; the length of the inner ring 31 is larger than the thickness of the mounting plate 15, so that one end of the inner ring 31 is sleeved on the mounting plate 15, and the other end of the inner ring 31 is suspended; the gear rings 32 and the inner rings 31 can be fixed through screw fixation or through key connection, and two ends of the mounting frame 5 are respectively welded and fixed with the two inner rings 31, so that the rotation of the two gear rings 32 respectively drives the two inner rings 31 to rotate, and the two inner rings 31 jointly drive the mounting frame 5 to rotate.
At least one first driving motor 33 is mounted on each mounting plate 15, driving gears 34 are mounted on output shafts of the plurality of first driving motors 33, and the plurality of driving gears 34 are meshed with the gear ring 32 together. The plurality of first driving motors 33 on each mounting plate 15 are uniformly distributed at intervals along the circumferential direction of the mounting plate 15, the driving gears 34 on the output shafts of the first driving motors 33 are fixedly connected through keys, and the driving gears 34 on the plurality of first driving motors 33 on each mounting plate 15 are jointly meshed with the gear rings 32, so that the gear rings 32 can be prevented from radial displacement in the rotating process, the gear rings 32 can rotate more stably, the inner ring 31 finally drives the mounting frame 5 to rotate more stably, and the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 on the mounting frame 5 are prevented from shaking.
The mounting frame 5 comprises a plurality of connecting frames 51 which are uniformly distributed at intervals along the circumferential direction of the inner rings 31, two ends of the plurality of connecting frames 51 are respectively fixed with the two inner rings 31, and the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 are respectively arranged on the plurality of connecting frames 51 one by one; the two ends of the plurality of connecting frames 51 are respectively sleeved with an outer ring 52. The connecting frame 51 is rectangular frame-shaped, the width direction of the connecting frame 51 and the radial direction of the inner rings 31 are on the same straight line, two ends of the connecting frame 51 are respectively welded and fixed with the two inner rings 31, and the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 are respectively fixed on the connecting frames 51 one by one through mounting supports by adopting screws. The two outer rings 52 are coaxially and alternately arranged with the two inner rings 31 respectively, the lengths of the inner rings 31 and the outer rings 52 are equal, and the two ends of the inner rings 31 are aligned with the two ends of the outer rings 52 respectively, so that the installation of the two ends of the plurality of connecting frames 51 is facilitated; the outer surface of the inner ring 31 and the inner surface of the outer ring 52 may be also provided with regular polygon, when the outer surface of the inner ring 31 and the inner surface of the outer ring 52 are polygonal, the number of sides of the outer surface of the inner ring 31 is equal to the number of sides of the inner surface of the outer ring 52, specifically, the number of sides is equal to the number of the connecting frames 51, so that when the two ends of the connecting frames 51 are installed, the end parts of the connecting frames 51 are welded and fixed with the outer surface of the inner ring 31 and the inner surface of the outer ring 52 together, and the two ends of the connecting frames 51 are installed more conveniently.
The cleaning device 6 comprises a second driving motor 61 and a polishing control power supply 62 which are fixedly arranged on the connecting frame 51, and the second driving motor 61 is connected with the output end of the polishing control power supply 62; the output shaft of the second driving motor 61 is also fixedly provided with a cleaning wheel 63. The second driving motor 61 and the polishing control power supply 62 are both fixed on the connecting frame 51 through the mounting support by using screws, the cleaning wheel 63 is fixedly mounted on the output shaft of the second driving motor 61 through the screws, the polishing control power supply 62 is a 12V direct current power supply, the polishing control power supply 62 supplies power to the second driving motor 61, so that the second driving motor 61 can rotate, the cleaning wheel 63 on the output shaft of the second driving motor 61 rotates, and the cleaning wheel 63 cleans welding seams.
The high-definition visual acquisition device 7 comprises a high-definition camera 71 and a camera control power supply 72 which are fixedly installed on the connecting frame 51, and the high-definition camera 71 is connected with the output end of the camera control power supply 72. The high-definition camera 71 and the camera control power supply 72 are fixed on the connecting frame 51 through the mounting support by using screws, the high-definition camera 71 is an SGMC-Ex-W infrared high-definition camera 71, the camera control power supply 72 is a 12V direct-current power supply, the camera control power supply 72 supplies power to the high-definition camera 71, the high-definition camera 71 collects the surface condition of a welding seam, and the high-definition camera 71 collects the surface condition of the welding seam and then transmits and outputs images collected by the high-definition camera 71.
The automatic magnetic powder detection device 10 comprises a fixed plate 101 fixedly arranged on a connecting frame 51, a magnetic powder injury control instrument 102, a suspension and contrast agent controller 103; a suspension spray gun 105 and a contrast agent spray gun 106 are fixedly arranged on the fixed plate 101, a magnetic suspension cylinder 107 and a contrast agent cylinder 108 are fixedly arranged on the outer side of each outer ring 52, the magnetic suspension cylinder 107 is communicated with the magnetic suspension cylinder 107, and the contrast agent cylinder 108 is communicated with the contrast agent spray gun 106; the suspension spray gun 105 and the contrast agent spray gun 106 are connected to the output of the suspension and contrast agent controller 103; an automatic magnetic powder detection controller 104 is fixedly mounted on the fixing plate 101, and the magnetic powder injury control instrument 102 is connected with the output end of the automatic magnetic powder detection controller 104.
The fixing plate 101, the magnetic powder injury control instrument 102, the suspension and the contrast agent controller 103 are all arranged on the connecting frame 51 through mounting supports; the model of the magnetic powder injury control instrument 102 is B100S, and the model of the suspension and contrast agent controller 103 is KY12S; the suspension spray gun 105 and the contrast agent spray gun 106 are both embedded on the fixed plate 101, and the suspension spray gun 105 and the magnetic suspension cylinder 107 are communicated through a plastic hose, and the contrast agent spray gun 106 and the contrast agent cylinder 108 are also communicated through a plastic hose. When the weld is to be inspected, the suspension and contrast agent controller 103 sends a signal to the contrast agent spray gun 106, the contrast agent spray gun 106 sprays contrast agent to the weld, the suspension and contrast agent controller 103 sends a signal to the suspension spray gun 105, the suspension spray gun 105 sprays suspension to the weld, and finally the magnetic powder injury control instrument 102 magnetizes the weld locally.
A detection method of an in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism comprises the following specific detection steps:
(1) The detection device is sent into the pipeline, and the travelling wheel 4 starts to rotate, so that the detection device advances in the pipeline.
(2) In the advancing process of the detection device, the welding seam identification probe 12 identifies the welding seam in the pipeline, after the welding seam identification probe 12 identifies the welding seam, the travelling wheel 4 continues to rotate, so that the detection device continues to advance in the pipeline, and after the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 are aligned with the welding seam, the travelling wheel 4 stops rotating, so that the detection device stops advancing in the pipeline.
When the welding seam recognition probe 12 is recognized by the welding seam, the traveling wheel 4 continues to advance for a fixed distance, the fixed distance is the distance between the welding seam recognition probe 12 and the middle part of the detection device, and when the traveling wheel 4 advances for the fixed distance, the traveling wheel 4 stops rotating, so that the detection device integrally stops advancing, at the moment, the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 on the detection device are aligned with the welding seam, and at the moment, the circle centers of the rings of the city enclosed by the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 are coincident with the circle centers of the welding seam.
(3) The high-definition visual acquisition device 7 acquires, and the two rotating mechanisms 3 rotate simultaneously during acquisition, so that the high-definition visual acquisition device 7 circumferentially acquires welding seams.
Specifically, in the process of collecting the high-definition visual collection device 7, the camera control power supply 72 in the high-definition visual collection device 7 provides electric energy for the high-definition camera 71, the high-definition camera 71 collects welding seams, in the process of collecting the high-definition camera 71, the first driving motors 33 in the two rotating mechanisms 3 start to rotate, the driving gears 34 on the output shafts of the first driving motors 33 in the two rotating mechanisms 3 respectively drive the gear rings 32 in the two rotating mechanisms 3, the two gear rings 32 respectively drive the two inner rings 31 to rotate, and the two inner rings 31 rotate to jointly drive the mounting frame 5 to synchronously rotate, so that the high-definition camera 71 can realize circumferential scanning collection of the welding seams and record welding conditions.
(4) After the high-definition visual acquisition device 7 is used for acquiring, the cleaning device 6 starts to clean the welding line, and the cleaning device 6 is used for cleaning the whole welding line along with the rotation of the two rotating mechanisms 3 in the cleaning process, so that the cleaning device 6 is used for cleaning the whole welding line, and the high-definition visual acquisition device 7 is used for continuously acquiring the welding line while the cleaning device 6 is used for cleaning.
Specifically, when the cleaning device 6, the high-definition visual acquisition device 7 and the automatic magnetic powder detection device 10 on the mounting frame 5 are aligned with the welding seam accurately, the second driving motor 61 in the cleaning device 6 starts to rotate, and the rotation of the second driving motor 61 enables the cleaning wheel 63 fixed on the output shaft of the second driving motor 61 to synchronously rotate, so that the cleaning wheel 63 cleans the surface of the welding seam; in the process of cleaning the cleaning wheel 63, the mounting frame 5 is in the continuous rotation process, so that the mounting frame 5 can completely clean the welding line in the circumferential direction in the rotation process by the cleaning wheel 63, and the subsequent detection of the welding line is facilitated.
(5) After the cleaning device 6 cleans the welding seam, the automatic magnetic powder detection device 10 starts to magnetize the welding seam locally, at this time, the two rotating mechanisms 3 rotate simultaneously, so that the automatic magnetic powder detection device 10 performs circumference detection on the welding seam, and the whole welding seam is magnetized.
Specifically, after the cleaning wheel 63 cleans the weld, the suspension and contrast agent controller 103 in the automatic magnetic particle inspection device 10 first opens the contrast agent spray gun 106 so that the contrast agent spray gun 106 sprays contrast agent to the weld; then the suspension and contrast agent controller 103 opens the suspension spray gun 105 to enable the suspension spray gun 105 to spray the suspension to the welding line sprayed with the contrast agent, at the moment, the automatic magnetic powder detection controller 104 sends a signal to the magnetic powder injury control instrument 103, the magnetic powder injury control instrument 103 starts to magnetize the local part of the welding line after receiving the signal, and in the process of the magnetic powder injury control instrument 103 magnetizing the local part of the welding line, the magnetic powder injury control instrument 103 magnetizes the whole welding line due to the fact that the mounting frame 5 continuously rotates.
(6) After the welding seam is magnetized, the high-definition visual acquisition device 7 acquires the magnetized welding seam, and stores and processes the acquired image.
Specifically, after the whole welding seam is magnetized, the high-definition camera 71 in the high-definition visual acquisition device 7 acquires the magnetized welding seam, in the acquisition process of the high-definition camera 71, as the two mounting frames 5 continuously rotate, the high-definition camera 71 realizes circumferential scanning acquisition of the welding seam, records the condition of the welding seam, and stores and processes the acquired image after the acquisition of the welding seam is completed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The in-service long pipeline girth weld defect magnetic powder internal detection mechanism is characterized by comprising a central tube, a fixed seat fixedly sleeved at two ends of the central tube and a rotating mechanism rotatably sleeved at two ends of the central tube; the two fixing seats are provided with travelling wheels; a mounting frame is further connected between the two rotating mechanisms, and cleaning devices, high-definition visual acquisition devices and automatic magnetic powder detection devices are uniformly arranged at intervals in the circumferential direction of the mounting frame; the head of the central tube is also fixedly provided with a welding seam identification probe;
the central tube is fixedly sleeved with two mounting plates, and the two rotating mechanisms are respectively arranged on the two mounting plates; a limiting disc is fixedly arranged on the outer sides of the two mounting discs, and the end part of the rotating mechanism is propped against the limiting disc; the two rotating mechanisms comprise an inner ring sleeved on the mounting plate and a gear ring fixedly mounted on the inner wall of the inner ring, and two ends of the mounting frame are respectively fixed on the two inner rings; at least one first driving motor is arranged on each mounting plate, driving gears are arranged on output shafts of the plurality of first driving motors, and the plurality of driving gears are meshed with the gear ring together; the mounting frame comprises a plurality of connecting frames which are uniformly distributed at intervals along the circumferential direction of the inner rings, two ends of the connecting frames are respectively fixed with the two inner rings, the connecting frames are rectangular frame-shaped, and the width direction of the connecting frames is on the same straight line with the radial direction of the inner rings; the cleaning device, the high-definition visual acquisition device and the automatic magnetic powder detection device are respectively arranged on the connecting frames one by one, the two ends of the connecting frames are respectively sleeved with the outer rings in a sleeved mode, the two outer rings are respectively coaxially arranged at intervals with the two inner rings, the lengths of the inner rings and the outer rings are equal, and the two ends of the inner rings are respectively aligned with the two ends of the outer rings.
2. The in-service long pipeline girth weld defect magnetic powder internal detection mechanism according to claim 1, wherein a plurality of traveling wheel brackets are arranged on the two fixing seats, the traveling wheel brackets are uniformly distributed at intervals along the circumferential direction of the fixing seats, and the traveling wheels are respectively arranged on the traveling wheel brackets one by one.
3. The in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism according to claim 1, wherein the head of the central tube is fixedly sleeved with a mounting head; the welding seam identification probes are distributed at equal intervals along the circumferential direction of the mounting head.
4. The in-service long-distance pipeline girth weld defect magnetic powder internal detection mechanism according to claim 1, wherein the cleaning device comprises a second driving motor and a polishing control power supply which are fixedly installed on the connecting frame, and the second driving motor is connected with the output end of the polishing control power supply; and the output shaft of the second driving motor is fixedly provided with a cleaning wheel.
5. The in-service long pipeline girth weld defect magnetic powder internal detection mechanism according to claim 1, wherein the high-definition visual acquisition device comprises a high-definition camera and a camera control power supply which are fixedly installed on the connecting frame, the high-definition camera is connected with the output end of the camera control power supply, and the high-definition camera is in bidirectional connection with the total control box.
6. The in-service long pipeline girth weld defect magnetic powder in-line detection mechanism according to claim 1, wherein the automatic magnetic powder detection device comprises a fixed plate fixedly installed on a connecting frame, a magnetic powder injury control instrument, a suspension and contrast agent controller; the suspension spray gun and the contrast agent spray gun are fixedly arranged on the fixing plate, a magnetic suspension hydraulic cylinder and a contrast agent cylinder are fixedly arranged on the outer side of each outer ring, the magnetic suspension hydraulic cylinder is communicated with the magnetic suspension hydraulic cylinder, and the contrast agent cylinder is communicated with the contrast agent spray gun; the suspension spray gun and the contrast agent spray gun are connected with the output ends of the suspension and contrast agent controller; the automatic magnetic powder detection controller is fixedly arranged on the fixing plate, and the magnetic powder injury control instrument is connected with the output end of the automatic magnetic powder detection controller.
7. A detection method using the detection mechanism according to any one of claims 1 to 6, comprising the following steps:
(1) The detection device is sent into the pipeline, and the travelling wheel starts to rotate, so that the detection device advances in the pipeline;
(2) In the advancing process of the detection device, the welding seam identification probe identifies the welding seam in the pipeline, the travelling wheel continues to rotate after the welding seam identification probe identifies the welding seam, so that the detection device continues to advance in the pipeline, and when the cleaning device, the high-definition visual acquisition device and the automatic magnetic powder detection device are aligned with the welding seam, the travelling wheel stops rotating, so that the detection mechanism stops advancing in the pipeline;
(3) The high-definition visual acquisition device acquires, and simultaneously, the two rotating mechanisms rotate simultaneously during acquisition, so that the high-definition visual acquisition device circumferentially acquires the welding line;
(4) After the high-definition visual acquisition device finishes acquisition, the cleaning device starts to clean the welding line, and in the cleaning process, the cleaning device is enabled to complete the cleaning of the whole welding line along with the rotation of the two rotating mechanisms;
(5) After the cleaning device cleans the welding seam, the automatic magnetic powder detection device starts to magnetize the welding seam locally, at the moment, the two rotating mechanisms rotate simultaneously, so that the automatic magnetic powder detection device performs circumference detection on the welding seam, and the whole welding seam is magnetized;
(6) After the welding seam is magnetized, the high-definition visual acquisition device detects the magnetized welding seam, and acquires, stores and processes the detected image.
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| CN112178357B (en) * | 2020-10-16 | 2022-03-01 | 重庆科技学院 | A post-weld data acquisition device for high-strength long-distance pipeline steel |
| CN114354740B (en) * | 2022-03-09 | 2022-05-31 | 成都熊谷油气科技有限公司 | Pipeline detection system |
| CN115656213A (en) * | 2022-10-25 | 2023-01-31 | 东北大学 | An all-round intelligent detection device for surface defects on the inner wall of a small steel pipe |
| CN117554470B (en) * | 2023-09-28 | 2024-08-23 | 宁波明峰检验检测研究院股份有限公司 | Pipeline inner wall magnetic powder detection device |
| CN117517196B (en) * | 2024-01-08 | 2024-03-26 | 烟台通瑞检测技术服务有限公司 | In-service pipeline nondestructive testing system |
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