CN113358671A - Pipeline online automatic flaw detection digital imaging system and imaging method - Google Patents
Pipeline online automatic flaw detection digital imaging system and imaging method Download PDFInfo
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- CN113358671A CN113358671A CN202110720523.3A CN202110720523A CN113358671A CN 113358671 A CN113358671 A CN 113358671A CN 202110720523 A CN202110720523 A CN 202110720523A CN 113358671 A CN113358671 A CN 113358671A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/20—Sources of radiation
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- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/628—Specific applications or type of materials tubes, pipes
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- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/629—Specific applications or type of materials welds, bonds, sealing compounds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an online automatic flaw detection digital imaging system for a pipeline, which comprises a rack and a control system, wherein a rotating mechanism capable of rotating on a vertical surface is arranged on the rack, the rotating mechanism is hollow and is provided with openings at the left end and the right end, an ray machine and a DR plate which are oppositely arranged are arranged on the circumference of the rotating mechanism, an accommodating opening for accommodating the pipeline between the ray machine and the DR plate is arranged on the rotating mechanism from the upper side, a plurality of supports for supporting the pipeline are respectively arranged at the two ends of the rotating mechanism on the rack, a positioning structure for positioning the pipeline is arranged on each support, an automatic coding machine for coding the surface of the pipeline is fixedly connected on the DR plate, a central adjusting device for driving the rotating mechanism to move so as to adjust the rotating center of the rotating mechanism to correspond to the center of the pipeline arranged on the supports is arranged on the rack, and a shielding mechanism for shielding the ray is arranged on the outer side of the rotating mechanism. The invention also discloses an imaging method of the on-line automatic flaw detection digital imaging system by utilizing the pipeline.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a digital imaging system for online automatic flaw detection of pipelines, and further relates to an imaging method of the digital imaging system for online automatic flaw detection of pipelines.
[ background of the invention ]
In the construction of petroleum, chemical engineering, steel, bridges, urban construction and the like, a large amount of pipeline laying work is involved, and the connection between pipelines is mostly constructed by adopting a welding method. In order to ensure the welding engineering quality, nondestructive detection of the welding seam is required. At present, the radiographic inspection is generally adopted, but the radiographic inspection has the problems of long inspection time, large radiation damage and the like, so that workpieces needing to be inspected are generally required to be transported to a special inspection room for inspection, or the inspection is carried out on a production site when unmanned work is carried out in the night, and all personnel need to be at least 50M away from the inspection position during the inspection. The pipelines detected by the inspection room need to be transported back to the production site, if individual problems exist in the pipelines in the batch, the defects can be found only when film evaluation is carried out after film shooting and air drying, which is usually carried out 2-5 hours after the film shooting, then the defective workpieces need to be repaired, and then the repaired workpieces are transported to the inspection room for inspection again, and due to the separation of the inspection and the production, the improvement of the productivity is severely restricted, so that the workpieces in different batches are often mixed in the production unit, and the delivery quality and the delivery date are severely influenced.
In addition, before flaw detection, slicing, filling a camera bag, filling a lead code and the like are needed, a welding line to be detected is segmented and marked, the camera bag is attached to a position to be detected, flaw detection is carried out for 3-10 minutes (determined according to plate thickness and ray machine parameters), a flaw detector can enter a flaw detection area, a detected film is taken down, a pipeline is rotated by a certain angle to be aligned to the flaw detection position, the film is attached again, flaw detection can be carried out at the next position after an operator leaves a flaw detection room, the film is sent to a film washing room to be washed, fixed and dried after the integral flaw detection is finished, the dried film is sent to an evaluation room to be evaluated by the evaluation personnel, the flaw detection procedures are multiple, the period is long (generally, only 100 films can be shot by two operators in one day even if the circumferential flaw detector is used), the efficiency is low, the consumable expense is high, the processing time of the camera room is long, the imaging quality of the film is unstable and the like, the detection time and the detection result are greatly influenced by human factors.
For some special-shaped pipelines, the detection is more difficult, some positions are always missed when the detection is carried out by an operator according to an empirical rotation angle, and once the positions have defects, extremely serious results can be brought. As the pipeline flaw detection procedure is complicated, a sampling inspection system is also established for certain pipeline countries, so that the positions with defects are more likely to be missed and cannot be detected. And the ray negative of the pressure pipeline needs to be stored for a certain period of time under certain environmental conditions, so that a special film storage space is needed, and the color of an image of the negative after long-term storage is changed or faded, so that the original negative cannot review the original detection result.
At present, also there has been the automatic device of detecting a flaw of pipeline to pipeline flaw detection:
such as patent numbers: CN201051084Y, a pipeline weld seam detection device, including computer, ray source and detector, the ray source and detector are respectively installed on the support A and B, the support A, B is hinged into an arc greater than 180 degrees and surrounds on the pipeline, the support is provided with a rubber wheel, the rubber wheel controls the opening degree of the support B to be close to the pipeline through a locking mechanism, and the rubber wheel moves circumferentially under the drive of a driving mechanism, thereby realizing the radial detection of the pipeline circumference, the device needs to arrange the pipeline on a suspended support during detection, then the detection device is installed at the position of the weld seam to be detected, the installation is laborious, and no lead room shield is arranged on the device, no any staff can be provided within the range of 50 meters around when the device is used, therefore, the device is more suitable for the quality detection of the field pipeline in the using period, because the device needs to be configured with a corresponding hinged structure according to the pipe diameter when in use, the pipe diameter can not be used in the occasion of frequently changing the pipe diameter, and when the pipe diameter is too small, the pipe diameter can not be used.
CN 111595872A is a nondestructive automatic detection tool for a special-shaped pipeline welding seam, the invention provides a nondestructive automatic detection tool for a special-shaped pipeline welding seam, an X-ray flaw detector, a digital detector, a rotary driving mechanism and a robot are placed in a lead room, and an operator is isolated from the X-ray flaw detector; the X-ray flaw detector and the digital detector are respectively arranged at the rotary center and the outer edge of the rotary driving mechanism, and the digital detector can rotate around the X-ray flaw detector; the robot selects a grabbing jig with a corresponding model on a jig quick-change station according to the model of the pipeline to be detected, completes replacement, grabs the pipeline between the X-ray flaw detector and the digital detector according to a preset track, and enables X-rays to penetrate through a pipe welding seam to be imaged on the digital detector. The X-ray system is a rod anode ray machine, double-wall penetration can be carried out on a small-diameter guide pipe, single-wall penetration can be carried out on a large-diameter pipeline, the rotary supporting system can rotate 360 degrees to carry out nondestructive detection on welding seams by X rays, the X-ray generator is compatible with nondestructive detection on small-diameter pipelines and large-diameter pipelines with the length being less than 1800mm and the weight being less than 65kg, and the detection tool is provided with a movable lead room and can carry out detection on a production site. The X-ray flaw detector and the digital detector are respectively arranged at the rotary center and the outer edge of the rotary driving mechanism, and the digital detector can rotate around the X-ray flaw detector; the robot selects a corresponding type of grabbing jig on the jig quick-change station according to the type of the pipeline to be detected, completes replacement, grabs the pipeline between the X-ray flaw detector and the digital detector according to a preset track, and enables X-rays to penetrate through a conduit welding seam to be imaged on the digital detector. However, since the device adopts the robot to grab and position the pipeline, the inspector needs to input the correct pipeline model specification, and once the pipeline is wrongly transported, the detection is insufficient and even equipment failure occurs. Secondly, the robots that grab the heavier pipelines are expensive, resulting in a costly whole set of equipment. Therefore, the tool is mainly used for detecting the straight pipe welding seam, and is difficult to compromise when the shape of the pipe fitting is complex. In addition, because the robot snatchs the ability limited, its detection that can't carry out heavier pipeline, because the radius of gyration of robot is great, it removes plumbous room area big, and the pipeline need transport and send this plumbous room into, and it is very troublesome to transport.
The present invention has been made based on such a situation.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a pipeline online automatic flaw detection digital imaging system which is simple in structure, convenient to operate, safe and reliable.
The invention is realized by the following technical scheme:
the utility model provides a pipeline automatic online flaw detection digital imaging system, includes the frame, be equipped with the rotary mechanism that can rotate on the vertical face in the frame, rotary mechanism cavity and its left and right sides both ends opening, be equipped with relative ray machine and the DR board that sets up on rotary mechanism on its circumference, and be located the symmetrical both sides at rotary mechanism center, be equipped with on the rotary mechanism and supply the pipeline to put into the mouth of putting into between ray machine and the DR board from the top, the both ends that lie in rotary mechanism in the frame are equipped with a plurality of supports that are used for supporting the pipeline respectively, be equipped with the location structure who is used for the pipeline of location on the support, fixedly connected with is used for beating the automatic coding machine of sign indicating number on the pipeline surface on the DR board, be equipped with in the frame and be used for driving rotary mechanism to remove with the central adjusting device that its center of rotation and lay the pipeline on the support central corresponding, the outer side of the rotating mechanism is provided with a shielding mechanism for shielding rays, and the control system is electrically connected with the rotating mechanism, the ray machine, the DR plate, the automatic coding machine and the central adjusting device and is provided with an operation panel for parameter setting and operation control.
According to the digital imaging system for online automatic flaw detection of the pipeline, the rotating mechanism is provided with the DR plate positioner capable of driving the DR plate to translate so as to adjust the distance from the DR plate to the surface of the pipeline.
An online automatic digital imaging system that detects a flaw of pipeline as above, location structure includes the vertical V type groove of seting up along the left and right direction on the support to and the horizontal V type groove of seting up along the fore-and-aft direction, vertical V type groove is mutually perpendicular with horizontal V type groove, vertical V type groove has the same flute profile with horizontal V type groove, support sliding connection is in the frame and can follow the slide rail horizontal slip that sets up in the frame, two about being close to rotary mechanism be equipped with on the support and rely on the spring to bounce the automatic rising shielding block in vertical V type groove up.
According to the digital imaging system for online automatic flaw detection of the pipeline, the central adjusting device is a lifter which is fixed on the rack and used for driving the rotating mechanism to move up and down, and the rotating center of the rotating mechanism is overlapped with the central plane of the longitudinal V-shaped groove.
The digital imaging system for the online automatic flaw detection of the pipeline comprises a front half shielding cover and a rear half shielding cover which can respectively move in the front and rear directions, when the front half shielding cover and the rear half shielding cover are relatively far away from each other, a channel leading to the rotating mechanism from top to bottom is formed between the front half shielding cover and the rear half shielding cover, the channel is used for placing a pipeline into the rotating mechanism from top to bottom, when detecting, the front half shield and the rear half shield are relatively close to each other and are butted together to form a shield chamber, the front half shielding cover and the rear half shielding cover are respectively provided with a yielding groove for yielding pipelines during butt joint, in order to adapt to pipeline flaw detection with various pipe diameters, the size of the opening of the yielding groove is adapted to the maximum pipe diameter, when other small pipelines are detected, the shielding mechanism also adopts an independent sliding block shielding plate to block a gap formed by folding the left and right abdicating grooves.
The pipeline on-line automatic flaw detection digital imaging system is characterized in that the shielding doors capable of sliding up and down are arranged at the left end and/or the right end of the front half shielding cover and the rear half shielding cover, one side of each shielding door is provided with the shielding door, and the abdicating grooves are formed in the corresponding shielding doors.
The digital imaging system for the online automatic flaw detection of the pipeline comprises a rotating ring, a rotating driving motor and a transmission belt, wherein the rotating driving motor and the transmission belt drive the rotating ring to rotate.
According to the digital imaging system for online automatic flaw detection of the pipeline, the ray machine adopts a cold cathode ray machine, the primary transillumination time of the cold cathode ray machine is 100-1000ms, the ray machine is wrapped by a lead plate and only exposes out of a ray emission window, and the DR plate is wrapped by a lead plate and only exposes out of a receiving surface.
The invention aims to solve another technical problem of providing an imaging method for flaw detection of a straight pipeline welding seam by utilizing a pipeline on-line automatic flaw detection digital imaging system.
In order to solve the technical problem, the invention provides an imaging method of a pipeline online automatic flaw detection digital imaging system, which comprises the following steps:
1) hoisting the pipeline to a longitudinal V-shaped groove of a bracket of the system, pressing the pipeline on an automatic lifting shielding block, pressing the pipeline into the bracket and always clinging to the lower side of the pipeline;
2) longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear shielding cases to butt joint together to form a closed state, and if the detection pipeline is a pipeline with a smaller diameter, shielding the pipeline by using a movable shielding plate with a corresponding pipe diameter in a sliding chute on the shielding case;
4) inputting the outer diameter of the pipeline on an operation panel of the control system, wherein the control system can automatically divide the pipeline into a plurality of equal divisions n according to the outer diameter of the pipeline;
5) starting detection, wherein the height of the rotating mechanism is automatically adjusted by the central adjusting device according to the outer diameter of the pipeline, so that the center of the rotating mechanism is superposed with the center of the pipeline;
6) the automatic coding machine is used for coding a section number 1 of a detected welding seam position on a pipeline to be detected;
7) the ray machine is automatically started to detect a flaw;
8) after the first section of flaw detection is finished, rotating the rotating mechanism by 360/n degrees, and automatically printing the serial number of the welding seam on the pipeline to be detected by an automatic coding machine in the rotating process;
9) the automatic coding machine prints a section number 2 of the position of the detected welding line on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the actions to finish the automatic flaw detection of one circumferential weld;
12) the rotating mechanism automatically rotates reversely to an initial position;
13) opening the front and rear half shielding cases;
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) and repeating the actions to finish the detection of other axial girth welds of the pipeline.
The invention aims to solve another technical problem of providing an imaging method for detecting the weld joint of a belt elbow and a three-way pipeline by utilizing a pipeline on-line automatic flaw detection digital imaging system.
In order to solve the technical problem, the invention provides an imaging method of a pipeline online automatic flaw detection digital imaging system, which comprises the following steps:
1) hoisting the pipeline to a longitudinal V-shaped groove of a bracket of the system, pressing the pipeline on an automatic lifting shielding block, pressing the pipeline into the bracket and always clinging to the lower side of the pipeline;
2) longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear half shielding cases to butt joint together to form a closed state, and if the detection pipeline is a small-diameter pipeline, shielding the pipeline by using a movable shielding plate with a corresponding pipe diameter in a sliding chute on the shielding case;
4) inputting the outer diameter of the pipeline on an operation panel of the control system, wherein the control system can automatically divide the pipeline into a plurality of equal divisions n according to the outer diameter of the pipeline;
5) starting detection, wherein the height of the rotating mechanism is automatically adjusted by the central adjusting device according to the outer diameter of the pipeline, so that the center of the rotating mechanism is superposed with the center of the pipeline;
6) the automatic coding machine is used for coding a section number 1 of a detected welding seam position on a pipeline to be detected;
7) the ray machine is automatically started to detect a flaw;
8) after the first section of flaw detection is finished, rotating the rotating mechanism by 360/n degrees, and automatically printing the serial number of the welding seam on the pipeline to be detected by an automatic coding machine in the rotating process;
9) the automatic coding machine prints a section number 2 of the position of the detected welding line on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the actions to finish the automatic flaw detection of one circumferential weld;
12) the rotating mechanism automatically rotates reversely to an initial position;
13) opening the front and rear half shielding cases;
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) repeating the above actions to complete the detection of other axial girth welds of the pipeline;
16) when the pipeline detects a circumferential weld joint of an elbow or a tee joint and a straight pipe, firstly sliding a shielding door upwards, moving a support close to a rotating mechanism to the outside of a shielding chamber, placing the elbow part of the pipeline with the elbow or the tee joint on the support, and moving the support to enable the elbow or the tee joint of the pipeline to be close to the rotating mechanism so as to detect the weld joint close to the elbow or the tee joint;
17) the shielding door is slid downwards, so that the transverse section of the pipeline with the elbow and the tee joint can be completely covered by the shielding chamber;
18) and performing flaw detection according to the steps of 3-15.
Compared with the prior art, the invention has the following advantages:
1. the invention can fix and linearly move various spatial special-shaped pipelines, so that welding seams on the same axis can be conveniently transferred to a flaw detection area, each welding seam can be automatically numbered and marked, each section of welding seam shot by each welding seam is marked with a serial number, and digital flaw detection and imaging are carried out. Therefore, the work of manual coding, film sticking, workpiece rotating and the like can be completely avoided, the operation times and the operation time of an operator entering and exiting a flaw detection area in the flaw detection process are greatly reduced, the detection efficiency is greatly improved, and the labor intensity is reduced. Meanwhile, due to the fact that the rotary flaw detection is automatically and equally divided, no dead angle exists in 360-degree rotary detection, and the phenomena of mis-detection and missing detection are avoided.
2. The active shielding design and realization of the ray machine and the DR plate are realized, and for the ray machine, except for the conical ray emission window, lead plates with enough thickness are adopted to wrap the other positions. Besides the receiving surface, all the other surfaces of the DR plate are also wrapped by lead plates with enough thickness, so that only the rays are emitted in the ray emitting direction, the rays are irradiated on the DR plate and shielded by the lead plate layer on the back of the DR plate, and only some scattered rays with extremely weak intensity exist in the other directions and are also shielded by the shielding mechanism on the periphery of the rotating mechanism. Therefore, the product formed by the invention can work with the production personnel at the production site, and the radiation quantity 3m away from the system is far lower than the requirement of the national standard of 1 msv/year.
3. Realize quick clamping and transillumination structure of space abnormal shape pipeline: through the rotary mechanism that adopts upper portion fluting, can fix a position the abnormal shape pipeline in space on the V type slot type location structure of support fast, and the shield room has still adopted gliding shield door structure from top to bottom, can be convenient with take the elbow, the lateral duct of three-way abnormal shape pipeline moves to the position of pressing close to rotary mechanism fast, slide the shield door down again and close, also shield above-mentioned lateral pipe section within the shield room, to entire system, the shield room is small and exquisite, it is effectual to shield, and the clamping, shift, it is efficient to shine transparently.
4. The invention can be compatible with pipelines with various pipe diameters, weights and lengths and large difference, improves the detection efficiency, reduces the skill dependence of personnel and reduces the injury to operators.
5. The invention has simple structure, simple and convenient control and easy function.
[ description of the drawings ]
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic diagram of the internal structure of an online automatic flaw detection digital imaging system for pipelines according to the present invention;
FIG. 2 is a left side view of the digital imaging system for on-line automatic flaw detection of pipelines with the shielding mechanism closed;
FIG. 3 is a left side view of the digital imaging system for on-line automatic flaw detection of pipelines with the shielding mechanism opened;
FIG. 4 is a schematic structural diagram of a digital imaging system for online automatic flaw detection of pipelines according to the present invention, which shields pipelines with smaller pipe diameters;
fig. 5 is a schematic view of the structure of a separate slider shielding plate.
[ detailed description ] embodiments
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 3, the pipeline online automatic flaw detection digital imaging system includes a frame 1, a rotating mechanism 2 capable of rotating on a vertical surface is arranged on the frame 1, the rotating mechanism 2 is hollow and has openings at left and right ends, an ray machine 3 and a DR plate 4 are arranged on the rotating mechanism 2 in opposite directions around the rotating direction, an entrance 21 for placing a pipeline 100 between the ray machine 3 and the DR plate 4 is arranged on the rotating mechanism 2, a plurality of supports 5 for supporting the pipeline 100 are respectively arranged at two ends of the rotating mechanism 2 on the frame 1, a positioning structure for positioning the pipeline 100 is arranged on the supports 5, an automatic coding machine 7 for coding the surface of the pipeline 100 is fixedly connected to the DR plate 4, a center adjusting device 8 for driving the rotating mechanism 2 to move to adjust the rotating center thereof corresponding to the center of the pipeline 100 placed on the supports 5 is arranged on the frame 1, the outer side of the rotating mechanism 2 is provided with a shielding mechanism 9 for shielding rays, and the rays are shielded through the shielding mechanism 9, so that the aim of protection in a production field is fulfilled.
The rotary mechanism 2, the ray machine 3, the DR plate 4, the automatic coding machine 7 and the central adjusting device 8 are electrically connected with the control system 10, for example, the work of the rotary mechanism 2, the ray machine 3, the DR plate 4 and the central adjusting device 8 is controlled by the control system 10 through cables, so that automatic control and digital imaging are realized, meanwhile, the control system 10 is provided with an operation panel, and the parameter setting of the detection system is completed by the operation panel. When detecting flaws, the left end and the right end of the rotating mechanism 2 are opened, a pipeline to be detected is placed between the ray machine 3 and the DR plate 4 from the placing inlet 21 and is placed on the support 5, the position of the rotating mechanism 2 is adjusted through the center adjusting device 8 according to the position and the pipe diameter of the pipeline, the rotating center of the rotating mechanism 2 corresponds to the center of the pipeline, so that when the ray machine 3 and the DR plate 4 rotate around the pipeline for 360 degrees, the distance between the ray machine 3 and the DR plate and the pipeline is stable, and the flaw detection accuracy is improved.
As shown in the embodiment of fig. 3, the rotating mechanism 2 includes a rotating ring 22, and a rotating drive motor 23 and a drive belt 24 for driving the rotating ring 22 to rotate.
In order to better detect the flaws of different pipelines, the rotating mechanism 2 is provided with a DR plate position changer 6 which can drive the DR plate 4 to translate so as to adjust the distance between the DR plate 4 and the rotating center, the DR plate position changer 6 is electrically connected with the control system 10, the DR plate position changer 6 can realize the expansion of the position of the DR plate 4 by adopting a structural mode that a motor drives a screw rod to rotate, so that the DR plate is controlled to move towards the pipe side according to the pipe diameter until the DR plate stops moving 5-30mm away from the surface of the pipeline and is fixed at the position, the DR plate is close to the surface of the pipeline, and the problem of image amplification caused by overlarge distance is reduced.
The positioning structure comprises a longitudinal V-shaped groove 51 and a transverse V-shaped groove 52, wherein the longitudinal V-shaped groove 51 is formed in the left-right direction of the support 5, the transverse V-shaped groove 52 is formed in the front-back direction of the support, the longitudinal V-shaped groove 51 is perpendicular to the transverse V-shaped groove 52, and the longitudinal V-shaped groove 51 and the transverse V-shaped groove 52 are in the same groove shape, namely the shape and the size are completely the same. The straight pipe is directly placed on the longitudinal V-shaped groove 51 for positioning, the structure is simple, the operation is convenient, and the transverse V-shaped groove 52 can be used for positioning a pipe with an elbow, a pipe with a three-way pipe, a butt flange and the like, so that the fixing and flaw detection of the heterogeneous pipeline are realized.
The support 5 is connected to the rack 1 in a left-right sliding manner, and one of the two is that the pipeline placed on the support 5 can move conveniently to enable the welding line to move to the position corresponding to the ray machine 3 and the DR plate 4, so that the pipeline loading process is simplified; and the second is that the pipeline can be moved longitudinally to detect the welding seams at different positions.
The central plane of the longitudinal V-shaped groove 51 coincides with the rotation center of the rotating mechanism 2, and the central adjusting device 8 is a lifter which is fixed on the rack 1 and used for driving the rotating mechanism 2 to move up and down, so that the structure is simple, the control is convenient, and the central adjustment is efficient and quick.
In order to realize the automation of pipeline and get and put, shielding mechanism 9 is including the first half shield 91 and the latter half shield 92 that can remove in the front and back direction respectively, form a passageway 93 that down accesss to rotary mechanism 2 from the top between the two when first half shield 91 and latter half shield 92 are kept away from relatively, passageway 93 supplies pipeline 100 to down put into rotary mechanism 2 from the top, when surveying first half shield 91 and latter half shield 92 are close to relatively and dock and form the shielded room together, be equipped with respectively on first half shield 91 and the latter half shield 92 and give way the groove 94 of stepping down of pipeline 100 when the butt joint.
On the first half shield cover 91 and the second half shield cover 92 left end and right end, can set up the shield door 95 that can slide from top to bottom at one of them one end or both ends, when shield door 95 upwards slided, the lower extreme was exposed empty, supplies support 5 to carry the pipeline business turn over shield room, as the embodiment shown in fig. 1, be equipped with shield door 95 at the first half shield cover 91 and the second half shield cover 92 left end, in the one side that is provided with shield door 95, the groove 94 of stepping down sets up on corresponding shield door 95.
The front half shield cover 91, the rear half shield cover 92 and the shield door 95 can be driven by an air cylinder or a motor and are electrically connected with the control system 10.
The invention is suitable for the detection of straight pipes, special pipes such as elbow pipes, three-way pipes and the like and the flaw detection of butt joint circular seams of the pipes and flanges, when the butt joint position of the elbow, the three-way pipe or the flange and the straight pipe is detected, the elbow or the transverse pipe section of the three-way pipe or the flange is required to be very close to a rotating mechanism, a shielding door 95 which slides up and down is designed on one side of a shielding chamber, the pipeline can be conveniently conveyed to the detection position by sliding the shielding door 95 upwards, and then the shielding door 95 slides down, so that the whole transverse position pipeline with the elbow or the three-way pipe or the flange can also be covered by the shielding chamber.
Certainly, for pipelines with different pipe diameters, when the pipelines are placed on the sliding V-shaped grooves, the distances from the lower ends of the pipelines to the bottom surfaces of the longitudinal V-shaped grooves 51 are greatly different, gaps between the shielding chambers and the pipelines are also different through the abdicating holes formed by the abdicating grooves 94, when the gaps have radiation leakage, the automatic lifting shielding blocks 53 can be installed on the left bracket 5 and the right bracket 5 which are close to the rotating mechanism 2, and the gaps on the lower sides can be greatly reduced by always being close to the lower sides of the pipelines under the action of springs; as shown in fig. 2, 4 and 5, left and right positioning blocks 96 having slots are provided on the left and right shield doors 95, the lower end of the independent slider shield plate 54 is provided with an arc-shaped groove buckled on the pipe 100 with a small pipe diameter, and the independent slider shield plate 54 is inserted into the left and right positioning blocks 96 from top to bottom.
Because the ray has stronger radiation to the human body, distance protection is unlikely to be realized in order to realize the safety protection of radiographic inspection detection in a production field, and therefore, shielding protection and time protection can only be adopted for radiographic protection.
In addition to the shielding mechanism 9, the shielding mechanism is provided with: in order to reduce the direct radiation quantity of the ray as much as possible, the invention adopts lead plates with enough thickness to shield the ray machine except the ray emission window, and also wraps all the other surfaces of the DR plate for receiving the ray except the receiving surface with enough thickness. In this way, only in the emission direction of the radiation window, radiation is emitted, but is effectively shielded by the lead layer on the back of the DR panel, while only scattered radiation with very low intensity exists in the remaining directions, and the damage of the scattered radiation is reduced by the shielding mechanism 9.
In time protection, the invention adopts a novel cold cathode ray machine, and the primary transillumination time of the cold cathode ray machine is only 100-1000ms, so that the time of the transillumination effect of rays is greatly reduced, and the time of production operators in the ray environment is correspondingly reduced.
The working process of the invention is as follows: the front half shielding cover 91 and the rear half shielding cover 92 are relatively far away from the formed channel 93, the placing port 21 of the rotating mechanism rotates upwards, the position can be used as the initial position of the rotating mechanism, the pipe diameter size is selected on a control screen of an operation panel corresponding to a control system, the rotating mechanism automatically adjusts the height according to the pipe diameter size, the center of the rotating mechanism is enabled to be overlapped with the center of the circular seam to be detected, the control system also controls the DR plate to move towards the pipe side according to the pipe diameter size until the DR plate is 5-30mm away from the surface of the pipe, and the DR plate is fixed at the position.
For flaw detection of straight pipe weld seams, the imaging method of the invention is as follows:
1) as shown in fig. 3, the special-shaped pipeline (including but not limited to round pipe, square pipe, steel pipe with tee, steel pipe with elbow, and steel pipe with flange) can be suspended from the upper side, and put into the middle of the rotating mechanism and fixed on the bracket, the bracket limits the central position of the pipeline in the front-back direction of the rotating mechanism, and the bracket can slide along the left-right direction, where the left-right direction corresponds to the length direction of the pipeline, so as to transfer the coaxial pipeline girth weld to the ray detection area for ray detection, the pipeline is pressed on the automatic lifting shielding block 53, and pressed into the bracket 5, and the pipeline is always tightly attached to the lower side of the pipeline, thereby greatly reducing the occurrence of lower side gap;
2) longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear shielding cases (91, 92) to butt joint together to form a closed state, and if the detection pipeline is a pipeline with a smaller diameter, shielding the pipeline by movable shielding plates (15) with corresponding pipe diameters in sliding chutes (16) on the shielding cases (91, 92);
4) inputting the outer diameter of the pipeline on an operation panel of the control system (10), wherein the control system (10) can automatically divide the pipeline into a plurality of equal divisions n along the circumferential direction according to the outer diameter of the pipeline;
5) starting detection, wherein the height of the rotating mechanism 2 is automatically adjusted by the central adjusting device 8 according to the outer diameter of the pipeline, so that the center of the rotating mechanism 2 is superposed with the center of the pipeline; the DR plate makes the receiving surface 5-30mm away from the pipeline by the DR plate position changer 6;
6) the automatic coding machine 7 codes a section number 1 of the position of the detected welding line on the pipeline to be detected, and the section number can also be used as a central mark of the section of the welding line;
7) the ray machine 3 is automatically started to detect flaws;
8) after the first section of flaw detection is finished, the rotating mechanism 2 rotates for 360/n degrees, and the automatic coding machine 7 automatically prints the number of the welding seam on the pipeline to be detected in the rotating process;
9) the automatic coding machine 7 codes a section number 2 of the position of the detected welding line on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the above actions to complete the automatic flaw detection of one circumferential weld;
12) the rotating mechanism 2 automatically rotates reversely to an initial position;
13) opening the front and rear half shields 91, 92;
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) and repeating the actions to finish the detection of other axial girth welds of the pipeline.
For the flaw detection of the weld joint with the elbow and the tee pipeline, the imaging method comprises the following steps:
1) hoisting the pipeline to a longitudinal V-shaped groove 51 of a bracket 5 of the system, pressing the pipeline on an automatic lifting shielding block 53, pressing the pipeline into the bracket 5 and always clinging to the lower side of the pipeline; 2) Longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear shielding cases (91, 92) to butt joint together to form a closed state, and if the detection pipeline is a pipeline with a smaller diameter, shielding the pipeline by movable shielding plates (15) with corresponding pipe diameters in sliding chutes (16) on the shielding cases (91, 92);
4) inputting the outer diameter of the pipeline on an operation panel of the control system (10), wherein the control system (10) can automatically divide the pipeline into a plurality of equal divisions n along the circumferential direction according to the outer diameter of the pipeline;
5) starting detection, wherein the height of the rotating mechanism 2 is automatically adjusted by the central adjusting device 8 according to the outer diameter of the pipeline, so that the center of the rotating mechanism 2 is superposed with the center of the pipeline;
6) the automatic coding machine 7 codes a section number 1 of the position of the detected welding line on the pipeline to be detected, and the section number can also be used as a central mark of the section of the welding line;
7) the ray machine 3 is automatically started to detect flaws;
8) after the first section of flaw detection is finished, the rotating mechanism 2 rotates for 360/n degrees, and the automatic coding machine 7 automatically prints the number of the welding seam on the pipeline to be detected in the rotating process;
9) the automatic coding machine 7 codes a section number 2 of the position of the detected welding line on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the above actions to complete the automatic flaw detection of one circumferential weld;
12) the rotating mechanism 2 automatically rotates reversely to an initial position;
13) opening the front and rear half shields 91, 92;
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) repeating the above actions to complete the detection of other axial girth welds of the pipeline;
16) when the pipeline detects the circular welding seam of the elbow or the tee joint and the straight pipe, the shielding door 95 is firstly upwards slid, the bracket 5 close to the rotating mechanism is moved out of the shielding chamber, the elbow part of the pipeline with the elbow or the tee joint is placed on the bracket, and the bracket is moved, so that the pipeline elbow or the tee joint can be close to the rotating mechanism 2, and the welding seam close to the elbow or the tee joint can be detected;
17) sliding the screen door 95 downward so that the transverse section of the pipe with the elbow and tee can be completely covered by the screen room;
18) and performing flaw detection according to the steps of 3-15.
Claims (10)
1. The utility model provides a pipeline digital imaging system of automatic flaw detection on line which characterized in that: including frame (1), be equipped with rotary mechanism (2) that can rotate on vertical face on frame (1), rotary mechanism (2) cavity and its left and right sides both ends opening, be equipped with relative ray machine (3) and DR board (4) that set up on rotary mechanism (2) on its circumference, and be located the symmetrical both sides at rotary mechanism center, be equipped with on rotary mechanism (2) and supply pipeline (100) from the higher authority to put into putting into mouth (21) between ray machine (3) and DR board (4), the both ends that lie in rotary mechanism (2) on frame (1) are equipped with a plurality of supports (5) that are used for supporting pipeline (100) respectively, be equipped with the location structure who is used for locating pipeline (100) on support (5), fixedly connected with is used for beating automatic coding machine (7) of sign indicating number on pipeline (100) surface on DR board (4), be equipped with on frame (1) and be used for driving rotary mechanism (2) to remove with adjust its center of rotation and lay in supporting with The center adjusting device (8) corresponding to the center of the pipeline (100) on the frame (5), a shielding mechanism (9) used for shielding rays is arranged on the outer side of the rotating mechanism (2), the control system (10) is electrically connected with the rotating mechanism (2), the ray machine (3), the DR plate (4), the automatic coding machine (7) and the center adjusting device (8), and the control system is provided with an operation panel for parameter setting and operation control.
2. The digital imaging system for the online automatic flaw detection of the pipeline according to claim 1, wherein: and the rotary mechanism (2) is provided with a DR plate position changer (6) which can drive the DR plate (4) to translate so as to adjust the distance from the DR plate (4) to the surface of the pipeline.
3. The digital imaging system for the online automatic flaw detection of the pipeline according to claim 1, wherein: location structure includes vertical V type groove (51) of seting up along the left and right directions on support (5) to and horizontal V type groove (52) of seting up along the fore-and-aft direction, vertical V type groove (51) are mutually perpendicular with horizontal V type groove (52), vertical V type groove (51) and horizontal V type groove (52) have the same flute profile, support (5) sliding connection is in frame (1) and can be along setting up the slide rail horizontal slip on frame (1), two about being close to rotary mechanism (2) be equipped with on support (5) and rely on the spring to upspring automatic rising shielding piece (53) in vertical V type groove (51).
4. The digital imaging system for the online automatic flaw detection of the pipeline according to claim 3, wherein: the center adjusting device (8) is a lifter which is fixed on the rack (1) and used for driving the rotating mechanism (2) to move up and down, and the rotating center of the rotating mechanism (2) is overlapped with the central plane of the longitudinal V-shaped groove (51).
5. The digital imaging system for the online automatic flaw detection of the pipeline according to claim 3, wherein: the shielding mechanism (9) comprises a front half shielding cover (91) and a rear half shielding cover (92) which can respectively move in the front and rear directions, when the front half shielding cover (91) and the rear half shielding cover (92) are relatively far away, a channel (93) leading to the rotating mechanism (2) from top to bottom is formed between the front half shielding cover and the rear half shielding cover, the channel (93) is used for placing the pipeline (100) into the rotating mechanism (2) from top to bottom, the front half shield cover (91) and the rear half shield cover (92) are relatively close to each other and butted together to form a shield chamber during detection, the front half shielding cover (91) and the rear half shielding cover (92) are respectively provided with a yielding groove (94) for yielding the pipeline (100) during butt joint, the size of the opening of the yielding groove (94) is suitable for a large-diameter pipeline, when other small pipelines are detected, the shielding mechanism also adopts a single independent sliding block shielding plate (54) to block a gap formed by the folding of the left and right abdicating grooves (94).
6. The digital imaging system for the online automatic flaw detection of the pipeline according to claim 5, wherein: be equipped with shield door (95) that can slide from top to bottom on first half shield cover (91) and second half shield cover (92) left end and/or the right-hand member, in the one side that is provided with shield door (95), groove (94) of stepping down sets up on corresponding shield door (95).
7. The digital imaging system for the online automatic flaw detection of the pipeline according to any one of claims 1 to 6, wherein: the rotating mechanism (2) comprises a rotating ring (22), a rotating driving motor (23) and a transmission belt (24), wherein the rotating driving motor drives the rotating ring (22) to rotate.
8. The digital imaging system for the online automatic flaw detection of the pipeline according to any one of claims 1 to 6, wherein: the ray machine (3) adopts a cold cathode ray machine, the primary transillumination time of the cold cathode ray machine is 100-1000ms, the ray machine (3) is wrapped in a lead plate and only exposes out of a ray emission window, and the DR plate (4) is wrapped in a lead plate and only exposes out of a receiving surface.
9. An imaging method using the pipeline on-line automatic flaw detection digital imaging system of claim 6, wherein for a straight pipeline weld, the imaging method comprises:
1) hoisting the pipeline to a longitudinal V-shaped groove (51) of a bracket (5) of the system, pressing the pipeline on an automatic lifting shielding block (53) and pressing the pipeline into the bracket (5), wherein the pipeline is always attached to the lower side of the pipeline;
2) longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear shielding cases (91, 92) to butt joint together to form a closed state, and if the detection pipeline is a pipeline with a smaller diameter, shielding the pipeline by movable shielding plates (15) with corresponding pipe diameters in sliding chutes on the shielding cases (91, 92);
4) inputting the outer diameter of the pipeline on an operation panel of the control system (10), wherein the control system (10) can automatically divide the pipeline into a plurality of equal divisions n along the circumferential direction according to the outer diameter of the pipeline;
5) starting detection, wherein a central adjusting device (8) automatically adjusts the height of the rotating mechanism (2) according to the outer diameter of the pipeline, so that the center of the rotating mechanism (2) is superposed with the center of the pipeline;
6) the automatic coding machine (7) codes a section number 1 of the detected welding seam position on the pipeline to be detected;
7) the ray machine (3) is automatically started to detect flaws;
8) after the first section of flaw detection is finished, the rotating mechanism (2) rotates for 360/n degrees, and the automatic coding machine (7) automatically prints the serial number of the welding seam on the pipeline to be detected in the rotating process;
9) the automatic coding machine (7) codes a section number 2 of the detected welding seam position on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the actions to finish the automatic flaw detection of one circumferential weld;
12) the rotating mechanism (2) automatically rotates reversely to an initial position;
13) opening the front and rear half shields (91, 92);
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) and repeating the actions to finish the detection of other axial girth welds of the pipeline.
10. An imaging method using the digital imaging system for on-line automatic flaw detection of pipelines of claim 6, wherein for a weld with a bend and a tee, the imaging method comprises:
1) hoisting the pipeline to a longitudinal V-shaped groove (51) of a bracket (5) of the system, pressing the pipeline on an automatic lifting shielding block (53) and pressing the pipeline into the bracket (5), wherein the pipeline is always attached to the lower side of the pipeline;
2) longitudinally moving the pipeline, and transferring the first girth weld to a region to be detected;
3) sliding the front and rear shielding cases (91, 92) to butt joint together to form a closed state, and if the detection pipeline is a small-diameter pipeline, shielding the detection pipeline by movable shielding plates (15) with corresponding pipe diameters in sliding chutes on the shielding cases (91, 92);
4) inputting the outer diameter of the pipeline on an operation panel of the control system (10), wherein the control system (10) can automatically divide the pipeline into a plurality of equal divisions n along the circumferential direction according to the outer diameter of the pipeline;
5) starting detection, wherein a central adjusting device (8) automatically adjusts the height of the rotating mechanism (2) according to the outer diameter of the pipeline, so that the center of the rotating mechanism (2) is superposed with the center of the pipeline;
6) the automatic coding machine (7) codes a section number 1 of the detected welding seam position on the pipeline to be detected;
7) the ray machine (3) is automatically started to detect flaws;
8) after the first section of flaw detection is finished, the rotating mechanism (2) rotates for 360/n degrees, and the automatic coding machine (7) automatically prints the serial number of the welding seam on the pipeline to be detected in the rotating process;
9) the automatic coding machine (7) codes a section number 2 of the detected welding seam position on the pipeline to be detected;
10) continuously carrying out automatic detection on the welding line of the section;
11) repeating the actions to finish the automatic flaw detection of one circumferential weld;
12) the rotating mechanism (2) automatically rotates reversely to an initial position;
13) opening the front and rear half shields (91, 92);
14) longitudinally moving the pipeline, and transferring the next girth weld to the area to be detected;
15) repeating the above actions to complete the detection of other axial girth welds of the pipeline;
16) when the pipeline detects the circular welding seam of the elbow or the tee joint and the straight pipe, firstly sliding a shielding door (95) upwards, moving a support (5) close to the rotating mechanism to the outside of a shielding chamber, placing the elbow part of the pipeline with the elbow or the tee joint on the support, and moving the support to enable the elbow or the tee joint of the pipeline to be close to the rotating mechanism (2) so as to detect the welding seam close to the elbow or the tee joint;
17) sliding the screen door (95) downwards so that the transverse section of the pipe with the elbow and the tee can be completely covered by the screen room;
18) and performing flaw detection according to the steps of 3-15.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114758588A (en) * | 2022-05-25 | 2022-07-15 | 贵州航天精工制造有限公司 | Radiographic inspection image marking device and using method thereof |
| CN116577359A (en) * | 2023-07-12 | 2023-08-11 | 瑞茂光学（深圳）有限公司 | Shell ring class work piece welding seam check out test set based on X ray detects |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114758588A (en) * | 2022-05-25 | 2022-07-15 | 贵州航天精工制造有限公司 | Radiographic inspection image marking device and using method thereof |
| CN114758588B (en) * | 2022-05-25 | 2023-11-10 | 贵州航天精工制造有限公司 | Radiographic inspection image marking device and application method thereof |
| CN116577359A (en) * | 2023-07-12 | 2023-08-11 | 瑞茂光学（深圳）有限公司 | Shell ring class work piece welding seam check out test set based on X ray detects |
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