CN209894760U - Pipeline flaw detection device - Google Patents
Pipeline flaw detection device Download PDFInfo
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- CN209894760U CN209894760U CN201920207796.6U CN201920207796U CN209894760U CN 209894760 U CN209894760 U CN 209894760U CN 201920207796 U CN201920207796 U CN 201920207796U CN 209894760 U CN209894760 U CN 209894760U
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Abstract
The utility model discloses a pipeline device of detecting a flaw belongs to the pipeline detection area. The device comprises: first connecting seat, second connecting seat, connecting rod, first probe and second probe. Wherein, the first end of first connecting seat passes through the connecting rod and links to each other with the second end of second connecting seat, and the axis of connecting rod forms first contained angle with the bottom surface of first connecting seat, and the axis of connecting rod forms the second contained angle with the bottom surface of second connecting seat, and at least one in the angle of first contained angle and the angle of second contained angle is variable. The first probe is connected with the first connecting seat, and the second probe is connected with the second connecting seat. The utility model discloses a first connecting seat and second connecting seat are connected to the connecting rod to make the first probe that links to each other with first connecting seat, the second probe that links to each other with the second connecting seat can laminate with multiple curvature radius's pipeline, this piping installation can be used to the flaw detection of multiple curvature radius's pipeline promptly, and application scope is wide.
Description
Technical Field
The utility model relates to a pipeline inspection field, in particular to pipeline device of detecting a flaw.
Background
During the laying of the pipelines, the pipelines can be connected by welding, and the joints formed during the welding process for connecting the pipelines are called welding seams. Because the welding seam often has the defect, therefore need carry out the flaw detection to the pipeline to detect the welding seam defect, avoid the emergence of incident.
The related art provides a pipeline flaw detection device, which comprises a first probe and a second probe sleeved on the same straight rod. When the device is used, the straight rod drives the first probe and the second probe to slide along the outer wall of the pipeline. In the sliding process, the first probe continuously emits pulses, and if the pipeline welding seam has defects, the emitted pulses can be reflected by the defects of the welding seam and the inner wall of the pipeline in sequence, so that the second probe receives the reflected pulses. Therefore, when the second probe receives the pulse at a certain position, the welding seam defect at the position can be determined, and the pipeline flaw detection is realized.
The inventors found that the related art has at least the following problems:
because the first probe and the second probe are sleeved on the same straight rod, the first probe and the second probe can only be attached to the outer wall of the pipeline with a straight line in the axial direction, namely, the pipeline flaw detection device is only suitable for the pipeline with the straight line in the axial direction, and the application range of the pipeline flaw detection device is small.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a pipeline device of detecting a flaw to solve the little problem of correlation technique application scope. The technical scheme is as follows:
there is provided a pipeline inspection apparatus, the apparatus comprising: the probe comprises a first connecting seat, a second connecting seat, a connecting rod, a first probe and a second probe;
the first end of the first connecting seat is connected with the second end of the second connecting seat through the connecting rod, a first included angle is formed between the axis of the connecting rod and the bottom surface of the first connecting seat, a second included angle is formed between the axis of the connecting rod and the bottom surface of the second connecting seat, and at least one of the angle of the first included angle and the angle of the second included angle is variable;
the first probe is connected with the first connecting seat, and the second probe is connected with the second connecting seat.
Optionally, the connecting rod is hinged to a first end of the first connecting seat, and the connecting rod is hinged to a second end of the second connecting seat. The device further comprises: spacing part and elastic component. The first end of the limiting part is connected with the top of the first end of the first connecting seat, and the second end of the limiting part is connected with the top of the second connecting seat through the elastic part.
Optionally, the apparatus further comprises: a fixing rod and a fixing member; the second end of the limiting part is provided with a mounting hole, the fixing rod penetrates through the mounting hole, and the first end of the fixing rod is connected with the top of the second connecting seat. The fixing part is axially positioned on the limiting part, and the fixing part can axially displace along the fixing rod.
Optionally, the fixing member is a nut, and the outer wall of the fixing rod has a thread engaged with the thread of the nut.
Optionally, the apparatus further comprises: the probe cover comprises a first probe cover, a first slide rail, a second probe cover and a second slide rail. The first probe is located in the first probe sleeve, the first probe sleeve is connected with the first sliding rail, the first probe sleeve can slide along the first sliding rail, and the first sliding rail is connected with the first connecting seat. The second probe is positioned in the second probe sleeve, the second probe sleeve is connected with the second sliding rail, the second probe sleeve can slide along the second sliding rail, and the second sliding rail is connected with the second connecting seat.
Optionally, there are two parallel first mounting panels on the first connection seat, there is a first folded plate one end of first slide rail, first folded plate fixed connection is between two first mounting panels, so that first slide rail with first connection seat links to each other. The second connecting seat is provided with two parallel second mounting plates, one end of the second sliding rail is provided with a second folded plate, and the second folded plate is fixedly connected between the two second mounting plates so as to enable the second sliding rail to be connected with the second connecting seat.
Optionally, the apparatus further comprises: a first attachment screw and a second attachment screw. First mounting panel with all there is first screw on the first folded plate, first screw with first connecting screw phase-match, first mounting panel with first folded plate passes through first connecting screw fixed connection. The second mounting panel with all there is the second screw on the second folded plate, the second screw with second connecting screw phase-match, the second mounting panel with the second folded plate passes through second connecting screw fixed connection.
Optionally, the bottoms of the first probe sleeve and the second probe sleeve are provided with wear-resistant blocks.
Optionally, the first slide rail and the second slide rail are both provided with scales.
Optionally, the number of connecting rods is two.
The utility model provides a beneficial effect that technical scheme brought includes at least:
connect first connecting seat and second connecting seat through the connecting rod to make the first probe that links to each other with first connecting seat, the second probe that links to each other with the second connecting seat can laminate with multiple curvature radius's pipeline, application scope is wide.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a pipeline flaw detection device provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a pipeline flaw detection device provided by an embodiment of the present invention;
FIG. 3 is a schematic view of the pipeline flaw detection device provided by the embodiment of the present invention;
FIG. 4 is a schematic diagram of a pipeline flaw detection device provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a pipeline flaw detection device provided by an embodiment of the present invention for checking;
fig. 6 is a schematic structural diagram of a pipeline flaw detection device provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pipeline flaw detection device provided by an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pipeline flaw detection device provided by an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pipeline flaw detection device according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a pipeline flaw detector according to an embodiment of the present invention.
Wherein the reference numerals in the drawings are explained as follows:
the probe comprises a first connecting seat 1, a first mounting plate 101, a second connecting seat 2, a second mounting plate 201, a connecting rod 3, a first probe 4, a second probe 5, a limiting part 6, an elastic part 7, a fixing rod 8, a fixing part 9, a first probe sleeve 10, a first sliding rail 11, a first folded plate 1101, a second probe sleeve 12, a second sliding rail 13, a second folded plate 1301, a first connecting screw 14 and a second connecting screw 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the utility model provides a pipeline device of detecting a flaw, see figure 1, the device includes: the probe comprises a first connecting seat 1, a second connecting seat 2, a connecting rod 3, a first probe 4 and a second probe 5;
the first end of the first connecting seat 1 is connected with the second end of the second connecting seat 2 through the connecting rod 3, the axis of the connecting rod 3 and the bottom surface of the first connecting seat 1 form a first included angle, the axis of the connecting rod 3 and the bottom surface of the second connecting seat 2 form a second included angle, and at least one of the angle of the first included angle and the angle of the second included angle is changeable; the first probe 4 is connected with the first connecting seat 1, and the second probe 5 is connected with the second connecting seat 2.
Connecting rod 3 accessible screw is connected with first connecting seat 1, second connecting seat 2 to at least one in the angle of realizing the angle of first contained angle and the angle of second contained angle is variable. When the screw was screwed up, the angle of first contained angle and the angle of second contained angle were all fixed, and the relative position between connecting rod 3 and first connecting seat 1, the second connecting seat 2 keeps fixed promptly. When the screw is unscrewed, at least one of the angle of the first included angle and the angle of the second included angle is variable. That is, the present embodiment provides three embodiments as follows: the first is that the angle of the first included angle is not variable and the angle of the second included angle is variable, the second is that the angle of the first included angle is variable and the angle of the second included angle is not variable, and the third is that the angle of the first included angle and the angle of the second included angle are both variable. Whichever embodiment is adopted, when the screw is unscrewed, the relative position between the first connecting seat 1 and the second connecting seat 2 can be adjusted.
Through the regulation, the first connecting seat 1 and the second connecting seat 2 can be located at different heights in the vertical direction, and the first probe 4 connected with the first connecting seat 1 and the second probe 5 connected with the second connecting seat 2 can be attached to pipelines with different curvature radiuses. It can be seen that, compared with the flaw detection device in which the first probe 4 and the second probe 5 are both sleeved on the same straight rod, the pipeline flaw detection device provided by the embodiment has a wider application range.
Next, a description will be given of a procedure of using the pipe flaw detector provided in this embodiment:
as shown in fig. 2, the device is placed on the outer wall of the pipeline, and the first probe 4 and the second probe 5 are both attached to the outer wall of the pipeline. And then, enabling the second probe 5 to emit ultrasonic beams, wherein if the pipeline welding seam has defects, the ultrasonic beams generated by the second probe 5 sequentially pass through the welding seam defects and the reflection of the inner wall of the pipeline to obtain reflected ultrasonic beams, and the reflected ultrasonic beams can be received by the first probe 4. Therefore, when the first probe 4 receives the reflected ultrasonic beam at a certain position, the existence of the weld defect at the position can be judged, and the pipeline flaw detection is realized.
It should be noted that, in the use process of the device, the first probe 4 and the second probe 5 should be axially located on the same side of the weld joint and move along the direction of the weld joint to complete pipeline flaw detection. The schematic diagram of the use of the device can be seen in fig. 3.
The first probe 4 and the second probe 5 are both circular transverse wave probes with a tangential value of a sound beam refraction angle of 1 and a sound beam deviation angle of not more than 2 degrees (unit: degree) so as to ensure that the direction of the sound beam can be rotationally adjusted. The first probe 4 and the second probe 5 each have a diameter of 25mm (unit: mm), a wafer area of 13mm × 13mm, and a frequency of 4MHz (unit: MHz). In addition, the present embodiment does not limit the number of the connecting rods 3. For example, the number of the connecting rods 3 is two, or one or three, and the number can be adjusted according to actual needs.
Further, the present embodiment may also check the flaw detection accuracy of the pipeline flaw detection apparatus. Referring to fig. 4, in this embodiment, a steel pipe with a wall thickness of 21.4mm and a diameter of 1422mm is selected as a calibration sample, and an electric spark erosion machine is used to etch a notch with a depth of 14.5mm and a width of 25mm from the inner wall of the steel pipe. And then welding and filling the notch groove, wherein the welding depth is 7mm, and finally obtaining a target notch groove with the depth of 7.5mm and the width of 25mm, wherein the target notch groove is positioned in the center of the pipe wall and is vertical to the pipe wall.
Next, the device is placed on the outer wall of the steel pipe, and the acoustic beam directions of the first probe 4 and the second probe 5 are adjusted, so that the reflected wave received by the first probe 4 at the target grooving position reaches 80% of the full amplitude of the first probe 4, and thus the static adjustment is completed. Then, the steel pipe was subjected to flaw detection using this apparatus, and an envelope diagram as shown in fig. 5 was obtained. In fig. 5, the transverse direction represents the propagation time of the ultrasonic beam emitted by the second probe 5, and the longitudinal direction represents the amplitude of the reflected ultrasonic beam received by the first probe 4. Therefore, the device can detect the target notch, thereby realizing pipeline flaw detection.
Besides the connection of the connecting rod 3 with the first connecting seat 1 and the second connecting seat 2 by means of screw connection, in this embodiment, the connection between the connecting rod 3 and the first connecting seat 1 and the second connecting seat 2 may alternatively be performed by means of hinge connection. Namely, the connecting rod 3 is hinged to the first end of the first connecting seat 1, and the connecting rod 3 is hinged to the second end of the second connecting seat 2.
It can be seen that, in this embodiment, the connecting rod 3 is movably connected with the first connecting seat 1 and the second connecting seat 2. Therefore, the manual adjustment of the first probe 4 and the second probe 5 can be omitted, and the device is directly placed on the pipeline, so that the first probe 4 and the second probe 5 are attached to the outer wall of the pipeline.
Further, in this embodiment, as shown in fig. 6, the apparatus further includes: a limiting part 6 and an elastic part 7. Wherein, the first end of spacing part 6 links to each other with the top of the first end of first connecting seat 1, and the second end of spacing part 6 passes through elastomeric element 7 and links to each other with the top of second connecting seat 2.
The limiting component 6 and the elastic component 7 have the following functions: apply radial inward elastic force to second connecting seat 2 to guarantee the inseparable laminating of second connecting seat 2 and pipeline outer wall, thereby improved this pipeline flaw detection device's detection accuracy.
The limiting component 6 may be a limiting sheet, the elastic component 7 may be a spring, and the specific structures of the limiting component 6 and the elastic component 7 are not limited in this embodiment.
In an alternative embodiment, as shown in fig. 7, the apparatus further comprises: a fixing rod 8 and a fixing member 9;
a mounting hole is formed in the second end of the limiting part 6, the fixing rod 8 penetrates through the mounting hole, and the first end of the fixing rod 8 is connected with the top of the second connecting seat 2; the fixing part 9 is axially positioned above the limiting part 6, and the fixing part 9 can axially displace along the fixing rod 8.
It can be seen that the fixing part 9 is adjusted to move along the axial direction of the fixing rod 8, so that the position of the limiting part 6 is fixed, the limiting part 6 is prevented from deviating under the action of the elastic part 7, and the relative positions of the limiting part 6, the elastic part 7, the first connecting seat 1 and the second connecting seat 2 in the device are reinforced.
The fixation member 9 should be axially displaceable along the fixation rod 8. For example, the fixing member 9 may be a nut, the fixing rod 8 may have a thread on an outer wall thereof to engage with the thread of the nut, and the fixing member 9 may be rotated to displace the fixing member 9 in the axial direction of the fixing rod 8. Of course, this embodiment is not limited thereto, for example, the fixing member 9 may be slidably inserted into an outer wall of the fixing rod 8, and the fixing member 9 may also be axially displaced along the fixing rod 8.
Optionally, as shown in fig. 8, the pipeline flaw detection apparatus provided in this embodiment further includes: the device comprises a first probe sleeve 10, a first slide rail 11, a second probe sleeve 12 and a second slide rail 13;
the first probe 4 is positioned in a first probe sleeve 10, the first probe sleeve 10 is connected with a first slide rail 11, the first probe sleeve 10 can slide along the first slide rail 11, and the first slide rail 11 is connected with the first connecting seat 1; the second probe 5 is positioned in a second probe sleeve 12, the second probe sleeve 12 is connected with a second slide rail 13, the second probe sleeve 12 can slide along the second slide rail 13, and the second slide rail 13 is connected with the second connecting seat 2.
The first probe sleeve 10 protects the first probe 4, so that the reduction of flaw detection accuracy caused by damage to the first probe 4 is avoided, and the second probe sleeve 12 also protects the second probe 5. The first probe sleeve 10 can be clamped in the first slide rail 11, and the position of the first probe sleeve 10 can be adjusted in the horizontal direction; similarly, the position of the second probe cover 12 in the horizontal direction can also be adjusted. Therefore, the distance between the first probe 4 and the second probe 5 in the horizontal direction can be adjusted through the sliding rail, so that the ultrasonic beams emitted by the first probe 4 can be received by the second probe 5 after being reflected by the pipe walls with different thicknesses and materials, and the application range of the device is further expanded.
In an alternative embodiment, the bottoms of the first probe cover 10 and the second probe cover 12 are provided with wear blocks. The abrasion-proof block can avoid the abrasion of the outer wall of the pipeline to the first probe sleeve 10 and the second probe sleeve 12, so that the service life of the device is prolonged.
In addition, optionally, scales are arranged on the first slide rail 11 and the second slide rail 13, so that the distance between the first probe sleeve 10 and the second probe 5 in the horizontal direction can be accurately adjusted, and the flaw detection accuracy of the device is improved.
As for the connection manner of the first slide rail 11 and the first connecting seat 1, and the second slide rail 13 and the second connecting seat 2, optionally, as shown in fig. 9, the following connection manner is adopted in the present embodiment:
the first connecting seat 1 is provided with two parallel first mounting plates 101, one end of the first slide rail 11 is provided with a first folding plate 1101, and the first folding plate 1101 is fixedly connected between the two first mounting plates 101 so as to connect the first slide rail 11 with the first connecting seat 1; there are two parallel second mounting panels 201 on the second connecting seat 2, there is second baffle 1301 in the one end of second slide rail 13, and second baffle 1301 fixed connection is between two second mounting panels 201 to make second slide rail 13 link to each other with second connecting seat 2.
Further, the present embodiment uses screws to realize the connection between the first folding plate 1101 and the first mounting plate 101, and the connection between the second folding plate 1301 and the second mounting plate 201. As shown in fig. 10, the apparatus further includes: a first connection screw 14 and a second connection screw 15;
the first mounting plate 101 and the first folding plate 1101 are respectively provided with a first screw hole, the first screw holes are matched with the first connecting screws 14, and the first mounting plate 101 and the first folding plate 1101 are fixedly connected through the first connecting screws 14; second screw holes are formed in the second mounting plate 201 and the second folding plate 1301, the second screw holes are matched with the second connecting screws 15, and the second mounting plate 201 and the second folding plate 1301 are fixedly connected through the second connecting screws 15. It can be seen that, in this connection mode, the connections between the first slide rail 11 and the first connection seat 1 and between the second slide rail 13 and the second connection seat 2 are all detachable connections, and the connection process is simple and convenient.
Of course, the connection structure and the connection method between the first slide rail and the first connection seat and between the second slide rail and the second connection seat are not limited in the embodiments of the present application, for example, the first slide rail and the first connection seat, and the second slide rail and the second connection seat may also be connected by welding.
To sum up, the embodiment of the utility model provides a connect first connecting seat and second connecting seat through the connecting rod to make the first probe that links to each other with first connecting seat, the second probe that links to each other with the second connecting seat can laminate with multiple curvature radius's pipeline. Therefore, the device is not only suitable for pipelines with straight axes, but also suitable for pipelines with various curvature radiuses, and has wide application range.
Further, this embodiment still provides radial inward elastic force through spacing part and elastomeric element to make second probe and pipeline outer wall closely laminate, guaranteed the accuracy degree that the device detected a flaw. In addition, the probe sleeve is adopted to protect the probe, the service life of the device is prolonged, the adjustable distance between the first probe and the second probe is realized through the slide rail, and the application range of the device is further expanded.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A pipeline inspection device, the device comprising: the device comprises a first connecting seat (1), a second connecting seat (2), a connecting rod (3), a first probe (4) and a second probe (5);
the first end of the first connecting seat (1) is connected with the second end of the second connecting seat (2) through the connecting rod (3), a first included angle is formed between the axis of the connecting rod (3) and the bottom surface of the first connecting seat (1), a second included angle is formed between the axis of the connecting rod (3) and the bottom surface of the second connecting seat (2), and at least one of the angle of the first included angle and the angle of the second included angle is variable;
the first probe (4) is connected with the first connecting seat (1), and the second probe (5) is connected with the second connecting seat (2).
2. The device according to claim 1, characterized in that said connecting rod (3) is hinged to a first end of said first connecting seat (1), said connecting rod (3) being hinged to a second end of said second connecting seat (2);
the device further comprises: a limiting component (6) and an elastic component (7);
the first end of the limiting part (6) is connected with the top of the first end of the first connecting seat (1), and the second end of the limiting part (6) is connected with the top of the second connecting seat (2) through the elastic part (7).
3. The apparatus of claim 2, further comprising: a fixing rod (8) and a fixing member (9);
a mounting hole is formed in the second end of the limiting part (6), the fixing rod (8) penetrates through the mounting hole, and the first end of the fixing rod (8) is connected with the top of the second connecting seat (2);
the fixing part (9) is axially positioned on the limiting part (6), and the fixing part (9) can axially displace along the fixing rod (8).
4. A device according to claim 3, characterized in that the fixing member (9) is a nut and that the fixing rod (8) has on its outer wall a thread engaging with the thread of the nut.
5. The apparatus of any of claims 1-4, further comprising: the device comprises a first probe sleeve (10), a first slide rail (11), a second probe sleeve (12) and a second slide rail (13);
the first probe (4) is positioned in the first probe sleeve (10), the first probe sleeve (10) is connected with the first sliding rail (11), the first probe sleeve (10) can slide along the first sliding rail (11), and the first sliding rail (11) is connected with the first connecting seat (1);
the second probe (5) is positioned in the second probe sleeve (12), the second probe sleeve (12) is connected with the second sliding rail (13), the second probe sleeve (12) can slide along the second sliding rail (13), and the second sliding rail (13) is connected with the second connecting seat (2).
6. The device according to claim 5, characterized in that the first connection seat (1) is provided with two parallel first mounting plates (101), and the first slide rail (11) is provided with a first flap (1101) at one end thereof, the first flap (1101) being fixedly connected between the two first mounting plates (101) so as to connect the first slide rail (11) with the first connection seat (1);
there are two parallel second mounting panels (201) on second connecting seat (2), there is second folded plate (1301) second slide rail (13)'s one end, second folded plate (1301) fixed connection is between two second mounting panels (201), so that second slide rail (13) with second connecting seat (2) link to each other.
7. The apparatus of claim 6, further comprising: a first connection screw (14) and a second connection screw (15);
the first mounting plate (101) and the first folded plate (1101) are respectively provided with a first screw hole which is matched with the first connecting screw (14), and the first mounting plate (101) and the first folded plate (1101) are fixedly connected through the first connecting screw (14);
the second mounting panel (201) with all there is the second screw on the second folded plate (1301), the second screw with second connecting screw (15) phase-match, second mounting panel (201) with second folded plate (1301) pass through second connecting screw (15) fixed connection.
8. The device as claimed in claim 5, characterized in that the bottoms of the first probe cover (10) and the second probe cover (12) are provided with wear blocks.
9. The device according to claim 5, characterized in that said first sliding track (11) and said second sliding track (13) are provided with graduations.
10. A device according to any one of claims 1-4, characterized in that the number of said connecting rods (3) is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207796.6U CN209894760U (en) | 2019-02-18 | 2019-02-18 | Pipeline flaw detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920207796.6U CN209894760U (en) | 2019-02-18 | 2019-02-18 | Pipeline flaw detection device |
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| CN209894760U true CN209894760U (en) | 2020-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111721837A (en) * | 2020-07-01 | 2020-09-29 | 北京正诺科技有限公司 | Hand-held type pipeline welding seam nondestructive test device |
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2019
- 2019-02-18 CN CN201920207796.6U patent/CN209894760U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111721837A (en) * | 2020-07-01 | 2020-09-29 | 北京正诺科技有限公司 | Hand-held type pipeline welding seam nondestructive test device |
| CN111721837B (en) * | 2020-07-01 | 2023-01-10 | 北京正诺科技有限公司 | Hand-held type pipeline welding seam nondestructive test device |
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