CN210109029U - Buried pipeline girth weld detection device - Google Patents
Buried pipeline girth weld detection device Download PDFInfo
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- CN210109029U CN210109029U CN201920882724.1U CN201920882724U CN210109029U CN 210109029 U CN210109029 U CN 210109029U CN 201920882724 U CN201920882724 U CN 201920882724U CN 210109029 U CN210109029 U CN 210109029U
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- girth weld
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Abstract
The utility model relates to a buried pipeline girth weld detection device, which comprises a bracket, including a motor, an end cap, a controller, and a cover plate, the support includes the platen, the front and back end upside of platen corresponds to erect with buried pipeline axis vertically front rail and back guide rail, the upside at the platen is fixed to the motor and makes its output shaft up, the output shaft vertical fixation of carousel and motor is connected, the both ends of slide rail are fixed with first slider respectively and make it correspond with preceding guide rail and back guide rail sliding fit, be equipped with on the slide rail rather than sliding fit's second slider, be equipped with rather than the vertically connecting rod between the downside of second slider and the carousel, connecting rod and carousel or second slider can rotate relatively, surface probe fixes the upside at the second slider, surface probe includes two same and interval distribution's detection coil, the one end interconnect of two detection coils. The device has the advantages of simple structure, convenience in use, sensitive action and high detection precision.
Description
Technical Field
The utility model relates to a pipeline welding seam detection device, concretely relates to detect device of buried pipeline girth weld.
Background
Compared with the traditional fossil fuel, the natural gas has the advantages of generating less carbon dioxide during combustion and not causing greenhouse effect, and becomes the main fuel for production and life of people. Safe transportation is an intermediate link of natural gas application, and the current long-distance natural gas pipeline in China reaches 7.7 km. The detection in the pipeline is an important technology for guaranteeing the safe transportation of the natural gas, the detection device and the corresponding data processing and storing system are arranged on a pipeline crawler, the crawler advances along the pipeline and completes the detection, and the detection contents comprise corrosion, residual wall thickness, pipeline deformation, welding seam positions and the like. The welding seam of the pipeline is the position where natural gas leakage is most likely to occur, and a long transportation pipeline of natural gas is formed by welding short pipelines with fixed lengths, so that a large number of girth welding seams exist, and therefore, when natural gas leakage occurs in the long transportation pipeline, the girth welding seams are usually required to be detected and positioned. At present, the detection of the circumferential weld in the field generally adopts visual detection, namely, a camera carried by a crawler is used for collecting images inside a pipeline, and the position of the circumferential weld is judged through the images. Since the pipe is buried under the floor, the inner surface of the pipe is covered with the deposit after a certain period of time, and it becomes very difficult to judge the position of the girth weld by the image. To solve the problem, those skilled in the art have developed two circumferential weld eddy current detection techniques based on electromagnetic induction, one is to detect the eddy current generated on the pipe wall by an inner-through probe and determine the circumferential weld position by the eddy current change, but for a large-caliber long natural gas transportation pipeline, if the inner-through probe is adopted, the coil of the inner-through probe becomes too large to be carried on a crawler, and the inner-through probe is not suitable for use. The other is that the eddy current generated on the pipe wall is detected through the surface probe, and the position of the circumferential weld is judged through the eddy current change, the surface probe has the advantages of small volume and portability, but only passes through a small section of circumferential weld during detection, and the detection result is easily interfered by local corrosion.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a buried pipeline circumferential weld detection device, it has simple structure, convenient to use, the action is sensitive, the interference killing feature is strong, detect the advantage that the precision is high.
In order to solve the above problems in the prior art, the utility model provides a buried pipeline girth weld detection device, which comprises a support, a motor, a rotary table, a slide rail and a surface probe, wherein the support comprises a bedplate, a front guide rail and a rear guide rail which are perpendicular to the axis of the buried pipeline are correspondingly erected on the upper sides of the front end and the rear end of the bedplate, the motor is fixed in the middle of the upper side of the bedplate and enables an output shaft of the motor to face upwards, the rotary table is vertically and fixedly connected with the output shaft of the motor, first slide blocks are respectively fixed on the two ends of the slide rail and correspondingly matched with the front guide rail and the rear guide rail in a sliding manner, a second slide block matched with the slide rail in a sliding manner is arranged on the slide rail, a connecting rod perpendicular to the second slide block is arranged between the lower side of the second slide block and the rotary table, the connecting rod and the rotary table or/or the second, one ends of the two detection coils are connected to each other.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, the axis of two detection coils is vertical state and makes its central line parallel with the slide rail.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, the downside of platen is equipped with rather than the vertically lifting rod, lifting rod adopts telescopic rod structure.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, the support is equipped with the gyro wheel respectively in the both ends position of front rail and back guide rail.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, stand and platen fixed connection are passed through respectively at the both ends of front rail and back guide rail, and the correspondence is equipped with left side pole and right side pole between the left and right sides end of front rail and back guide rail.
Further, the utility model relates to a buried pipeline girth welding seam detection device, wherein, slide rail, front rail and back guide rail all adopt the guide bar structure, first slider and second slider all adopt the sliding sleeve structure.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, the upper end and the second slider fixed connection of connecting rod, the lower extreme of connecting rod passes through the bearing and is connected with the carousel.
Further, the utility model relates to a buried pipeline girth weld detection device, wherein, the upper end of connecting rod is passed through the bearing and is connected with the second slider, the lower extreme and the carousel fixed connection of connecting rod.
The utility model relates to a buried pipeline girth weld detection device compares with prior art, has following advantage: the utility model discloses a set up the support, including a motor, an end cap, a controller, and a cover plate, the carousel, slide rail and surface probe, let the support set up the platen, correspond at the front and back end upside of platen and erect and bury ground pipeline axis vertically preceding guide rail and back guide rail, fix the motor at the upside middle part of platen and make its output shaft up, let the output shaft vertical fixation of carousel and motor be connected, fix first slider respectively and make it correspond and preceding guide rail and back guide rail sliding fit at the both ends of slide rail, set up rather than sliding fit's second slider on the slide rail, set up rather than the vertically connecting rod between the downside of second slider and carousel, make connecting rod and carousel or second slider relatively rotatable, fix the upside at the second slider with surface probe, let surface probe set up two the same and interval distribution's detection coil, and make the one end interconnect of two detection coils. Therefore, the buried pipeline girth weld joint detection device is simple in structure, convenient to use, sensitive in action, strong in anti-interference capability and high in detection precision. In practical application, the detection device is fixed on the pipeline crawler, the rotary table is in a horizontal state, the axis of the rotary table is perpendicular to the axis of the buried pipeline, alternating excitation signals are input to two detection coils of the surface probe and induced voltage differences of the two detection coils are recorded in real time in the process that the pipeline crawler travels along the inner wall of the buried pipeline, the rotary table is rotated at a high speed, and if the induced voltage differences with equal numerical values and opposite signs occur for multiple times within a certain time range, the circumferential weld joint can be determined to be detected. The utility model discloses a set up by the front guide, the back guide, the crosshead shoe mechanism that slide rail and second slider constitute, fix surface probe on the second slider, make the second slider pass through the connecting rod and be connected with the carousel, can make two relative direction that detect the coil of surface probe remain unchanged at rotatory in-process, will produce the induced voltage difference when it passes through the girth weld respectively, will produce the induced voltage difference that numerical value equals sign opposite when its rotatory 180 degrees once more passes through the girth weld, just can get rid of the interference that local corrosion or other defects produced based on this characteristic.
The following describes the welded seam detection device of a buried pipeline in further detail with reference to the specific embodiments shown in the drawings.
Drawings
Fig. 1 is a front view of the utility model of a buried pipeline girth weld detection device;
fig. 2 is a top view of the utility model of a buried pipeline girth weld detection device;
FIG. 3 is an enlarged view of a portion of the portion A of FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 2 at position B;
FIG. 5 is a schematic diagram of a pipeline girth weld inspection.
Detailed Description
It should be noted that, in the present invention, the terms of upper, lower, left, right, front, rear, etc. are only described according to the accompanying drawings, so as to facilitate understanding, and are not intended to limit the technical solution and the scope of the present invention.
As shown in fig. 1 to 5 the utility model relates to a buried pipeline girth welding seam detection device's embodiment, including support 1, motor 2, carousel 3, slide rail 4 and surface probe 5. A bedplate 11 is arranged on the bracket 1, and a front guide rail 12 and a rear guide rail 13 which are vertical to the axis of the buried pipeline are correspondingly erected on the upper sides of the front end and the rear end of the bedplate 11. The motor 2 is fixed in the middle of the upper side of the bedplate 11, the output shaft of the motor is upward, and the rotary plate 3 is vertically and fixedly connected with the output shaft of the motor 2. The first sliding blocks 41 are respectively fixed at two ends of the sliding rail 4 and are correspondingly matched with the front guide rail 12 and the rear guide rail 13 in a sliding way, and the second sliding blocks 42 matched with the sliding rails are arranged on the sliding rail 4 in a sliding way. A connecting rod 6 perpendicular to the lower side of the second sliding block 42 and the rotary disc 3 is arranged between the lower side of the second sliding block 42 and the rotary disc 3, and the connecting rod 6 and the rotary disc 3 or/and the second sliding block 42 can rotate relatively. The surface probe 5 is fixed to the upper side of the second slider 42, two detection coils 51 are provided on the surface probe 5 in the same and spaced arrangement, and one ends of the two detection coils 51 are connected to each other.
The buried pipeline girth weld joint detection device is simple in structure, convenient to use, sensitive in action and high in practicability. In practical application, the detection device is fixed on the pipeline crawler 8, the rotary table 3 is in a horizontal state, the axis of the rotary table is perpendicular to the axis of the buried pipeline 9, alternating excitation signals are input to two detection coils 51 of the surface probe 5 in the process that the pipeline crawler 8 travels along the inner wall of the buried pipeline 9, induced voltage differences of the two detection coils are recorded in real time, the rotary table 3 is made to rotate at a high speed, and if the induced voltage differences with equal numerical values and opposite signs occur for multiple times within a certain time range, the circumferential weld joint can be determined to be detected. The utility model discloses a setting is by front guide 12, back guide 13, the crosshead shoe mechanism that slide rail 4 and second slider 42 constitute, fix surface probe 5 on second slider 42, it is connected with carousel 3 to make second slider 42 pass through connecting rod 6, can make 5 two relative directions that detect coil 51 of surface probe remain unchanged at rotatory in-process, will produce induced voltage difference when it passes through girth weld 91 respectively, will produce the induced voltage difference that the sign is opposite that numerical value equals when it rotates 180 degrees once more through girth weld 91, just can get rid of the interference that local corrosion or other defects produced based on this characteristic, the degree of accuracy that has improved the detection, and it is fast to have detection speed, the high advantage of sensitivity. It should be noted that, as shown in fig. 5, the present invention provides the surface probe 5 with two identical and spaced detection coils 51, and connects one ends of the two detection coils 51 to each other, so as to form an electrical bridge. After the two detection coils 51 are fed with alternating excitation signals, alternating magnetic fields are respectively generated around the two detection coils 51, and eddy currents are induced on the inner wall surface of the pipeline at the corresponding positions by electromagnetic induction. When one of the detection coils 51 is located at the circumferential weld, the eddy current field induced by the detection coil 51 changes, and further affects the induced voltage of the detection coil 51, at this time, the induced voltages of the two detection coils 51 are no longer the same, the induced voltages of the two detection coils 51 are output through the bridge, and the induced voltage of the other detection coil 51 is subtracted from the induced voltage of one of the detection coils 51, so that the induced voltage difference between the two detection coils is obtained. When the surface probe 5 rotates 180 degrees, the relative direction of the two detection coils 51 is kept unchanged, and the induced voltage difference at this time and the induced voltage difference at the previous time are necessarily in the relationship of equal value and opposite sign. It should be noted that, the term "equal values" means approximately equal values, and since the rotating speed of the rotating disc 3 is much higher than the speed of the pipeline crawler 8, the small difference in the induced voltage difference obtained in two times due to the movement of the pipeline crawler 8 is negligible. In addition, in practical application, the utility model discloses still connected the resistance of the same resistance respectively at two other ends that detect coil 51 to guarantee the stability of its work.
As an optimized scheme, in the present embodiment, the axes of the two detection coils 51 are in a vertical state, and the central connecting line thereof is parallel to the slide rail 4. The structure can enhance the eddy current field and the induced voltage generated by the detection coils 51, and enable the passing direction of the two detection coils 51 to be perpendicular to the girth weld, namely, one detection coil 51 firstly passes through the girth weld, and the other detection coil 51 passes through the girth weld after the other detection coil completely passes through the girth weld, so that the induced voltage difference generated by the two detection coils is maximized, and the detection sensitivity and reliability are improved. For convenient use and improvement of adaptability to pipe diameter, the lifting rod 7 vertical to the bedplate 11 is arranged on the lower side of the bedplate, and the lifting rod 7 is made to adopt a telescopic rod structure. Through lifting 7 height-adjusting of pole, can make 5 pipeline inner walls of pressing close to of surface probe on the one hand, the sensitivity that the reinforcing detected, on the other hand can make the utility model discloses adapt to the pipeline of different bores, improved application scope and practicality. Meanwhile, the roller 14 is respectively arranged at the two ends of the front guide rail 12 and the rear guide rail 13 of the bracket 1, and the roller 14 rolls along the pipe wall, so that the moving stability is enhanced.
As specific implementation mode, the utility model discloses let the both ends of front rail 12 and back rail 13 respectively through stand 15 and 11 fixed connection of platen to corresponding between the left and right ends of front rail 12 and back rail 13 and having set up left side pole 16 and right pole 17, strengthened the stability of structure. For simplifying the structure and the preparation process, the utility model discloses make slide rail 4, preceding guide rail 12 and back guide rail 13 all adopted the guide bar structure to make first slider 41 and second slider 42 adopt with guide bar complex sliding sleeve structure. In practical application, in order to enable the connecting rod 6 and the rotary table 3 or/and the second slider 42 to rotate relatively, the utility model generally adopts the following two structural forms, one is to fixedly connect the upper end of the connecting rod 6 with the second slider 42, and connect the lower end of the connecting rod 6 with the rotary table 3 through a bearing; the other is that the upper end of the connecting rod 6 is connected with the second slide block 42 through a bearing, and the lower end of the connecting rod 6 is fixedly connected with the rotary disc 3. But not limited to this, the upper and lower ends of the connecting rod 6 may be correspondingly connected with the second sliding block 42 and the rotary table 3 through bearings; the bearings are provided only for ensuring the smoothness of the relative rotation, but not necessarily, a hole structure can be adopted, and the relative rotation can be realized by enabling one end of the connecting rod 6 to be located in the hole according to the specific structure.
Practical application shows, the utility model relates to a buried pipeline girth joint detection device has following beneficial effect: in the advancing process of the pipeline crawler, one circumferential weld is detected for multiple times, so that the interference of local corrosion or other types of welds can be effectively eliminated, and the detection accuracy is improved; the two detection coils of the surface probe are opposite to the inner wall of the pipeline, and the passing direction of the coils is perpendicular to the circumferential weld, so that the sensitivity and the reliability of detection are improved; by keeping the relative directions of the two detection coils unchanged, a slip ring is not needed to lead out a detection signal, and signal attenuation is avoided.
The above embodiments are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the claimed invention, and various modifications made by those skilled in the art according to the technical solutions of the present invention should fall within the scope of the present invention as defined by the claims.
Claims (8)
1. A buried pipeline girth weld detection device is characterized by comprising a support (1), a motor (2), a rotary table (3), a slide rail (4) and a surface probe (5), wherein the support (1) comprises a table plate (11), a front guide rail (12) and a rear guide rail (13) which are perpendicular to the axis of a buried pipeline are correspondingly erected on the upper sides of the front end and the rear end of the table plate (11), the motor (2) is fixed in the middle of the upper side of the table plate (11) and enables an output shaft of the motor to face upwards, the rotary table (3) is vertically and fixedly connected with the output shaft of the motor (2), first slide blocks (41) are respectively fixed at two ends of the slide rail (4) and enable the slide blocks to be correspondingly matched with the front guide rail (12) and the rear guide rail (13) in a sliding manner, second slide blocks (42) which are matched with the slide rails (4) are arranged on the slide rail (4), and connecting rods (6) which, the connecting rod (6) and the rotary disc (3) or/and the second sliding block (42) can rotate relatively, the surface probe (5) is fixed on the upper side of the second sliding block (42), the surface probe (5) comprises two detection coils (51) which are identical and distributed at intervals, and one ends of the two detection coils (51) are connected with each other.
2. A buried pipeline girth weld detection device according to claim 1, wherein the axes of the two detection coils (51) are vertical and the central connecting line thereof is parallel to the sliding rail (4).
3. The device for detecting the girth weld of the buried pipeline according to claim 2, wherein a lifting rod (7) perpendicular to the bedplate (11) is arranged on the lower side of the bedplate, and the lifting rod (7) is of a telescopic rod structure.
4. A buried pipeline girth weld detection device according to claim 3, characterized in that the bracket (1) is provided with rollers (14) at two ends of the front guide rail (12) and the rear guide rail (13), respectively.
5. The device for detecting the girth weld of the buried pipeline according to claim 4, wherein two ends of the front guide rail (12) and the rear guide rail (13) are respectively and fixedly connected with the bedplate (11) through the upright post (15), and a left side rod (16) and a right side rod (17) are correspondingly arranged between the left end and the right end of the front guide rail (12) and the rear guide rail (13).
6. The device for detecting the girth weld of the buried pipeline according to claim 5, wherein the sliding rail (4), the front guiding rail (12) and the rear guiding rail (13) are all of guide rod structures, and the first sliding block (41) and the second sliding block (42) are all of sliding sleeve structures.
7. A buried pipeline girth weld detection device according to any one of claims 1 to 6, characterized in that the upper end of the connecting rod (6) is fixedly connected with the second slider (42), and the lower end of the connecting rod (6) is connected with the rotary table (3) through a bearing.
8. A buried pipeline girth weld detection device according to any one of claims 1 to 6, characterized in that the upper end of the connecting rod (6) is connected with the second slider (42) through a bearing, and the lower end of the connecting rod (6) is fixedly connected with the rotary table (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920882724.1U CN210109029U (en) | 2019-06-12 | 2019-06-12 | Buried pipeline girth weld detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920882724.1U CN210109029U (en) | 2019-06-12 | 2019-06-12 | Buried pipeline girth weld detection device |
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| CN210109029U true CN210109029U (en) | 2020-02-21 |
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| CN201920882724.1U Active CN210109029U (en) | 2019-06-12 | 2019-06-12 | Buried pipeline girth weld detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133097A (en) * | 2019-06-12 | 2019-08-16 | 清华大学 | A kind of buried pipeline circumference weld inspection device and detection method |
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2019
- 2019-06-12 CN CN201920882724.1U patent/CN210109029U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133097A (en) * | 2019-06-12 | 2019-08-16 | 清华大学 | A kind of buried pipeline circumference weld inspection device and detection method |
| CN110133097B (en) * | 2019-06-12 | 2024-06-04 | 清华大学 | Buried pipeline girth weld detection device and detection method |
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