CN213398333U - System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow - Google Patents
System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow Download PDFInfo
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- CN213398333U CN213398333U CN202022036936.3U CN202022036936U CN213398333U CN 213398333 U CN213398333 U CN 213398333U CN 202022036936 U CN202022036936 U CN 202022036936U CN 213398333 U CN213398333 U CN 213398333U
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- pipe elbow
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- path pipe
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Abstract
The utility model discloses a detecting system of cambered surface circumference defect in path pipe elbow, including ultrasonic detection instrument, probe and comparison test block, wherein, ultrasonic detection instrument is connected with the probe, the comparison test block includes path pipe elbow test block, path pipe elbow test block is the U-shaped structure, the crooked position department of path pipe elbow test block sets up the line cutting groove, and the line cutting groove is located the inner arc side of path pipe elbow test block, the fluting direction in line cutting groove is mutually perpendicular with the axis of path pipe elbow test block, this system can detect path pipe elbow inner surface circumference defect.
Description
Technical Field
The utility model belongs to the nondestructive test field relates to a detecting system of cambered surface circumference defect in path pipe elbow.
Background
The use of the small-diameter pipe bent pipe occupies a large proportion in a power station boiler, and the reasons for defects of the bent pipe before use are mainly 2: firstly, the raw material of the bent pipe has defects; secondly, the steel pipe has defects generated in the pipe bending process. For the first situation, after the raw material of the small-caliber pipe enters the factory, the quality of the raw material can be effectively ensured by adopting vortex and ultrasonic online automatic detection. In the second case, if the small-diameter pipe has a defect at the bent portion during the pipe bending process, the ultrasonic detection method is adopted because the ray detection method is not easy to operate at the bent portion and the purpose of detecting the defect cannot be achieved.
The small-diameter pipe elbow is mostly applied to a pipe panel of a heating surface of a boiler in a thermal power plant, the arrangement of the elbow is compact, and the circumferential defects of the inner arc surface of the elbow cannot be detected by a conventional nondestructive testing method.
Therefore, it is necessary to adopt a detection system to detect circumferential defects of the intrados of the bent portion of the small-diameter pipe elbow.
At present, the steel pipe ultrasonic detection standards comprise GB/T5777- 'seamless steel pipe ultrasonic detection inspection method' 2008 and NB/T47013.3-2015 'pressure-bearing equipment nondestructive detection ultrasonic detection'. The ultrasonic detection standard of the elbow is only DL/T718-2014 ultrasonic detection of tee joints and elbows of a thermal power plant.
GB/T5777-2008 and NB/T47013.3-2015 specify a method for detecting longitudinal and transverse defects of a seamless steel tube by transverse waves, and do not relate to the detection of circumferential defects of an inner arc surface of a bent tube. DL/T718-2014 ultrasonic detection of tee joints and elbows in thermal power plants is only suitable for elbows with the outer diameter not less than phi 219mm, the wall thickness of 20-160 mm and the thickness-to-diameter ratio not more than 0.23. Specification range of the small-diameter pipe elbow: the outer diameter is greater than or equal to 32mm and less than or equal to 159mm, and the wall thickness is greater than or equal to 4mm and less than 14 mm. Therefore, DL/T718-2014 ultrasonic detection of tee joints and elbows in thermal power plants cannot be applied to detection of circumferential defects of small-diameter pipe elbows.
Due to market demands and lack of detection standards, a detection technology for circumferential defects of the inner cambered surface of the small-diameter pipe elbow is required to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a detecting system of cambered surface circumference defect in path pipe elbow, this system can detect cambered surface circumference defect in the path pipe elbow.
In order to achieve the above object, the detecting system of cambered surface circumference defect in path pipe elbow include ultrasonic detection instrument, probe and contrast test block, wherein, ultrasonic detection instrument is connected with the probe, and the contrast test block includes path pipe elbow test block, and path pipe elbow test block is the U-shaped structure, and the crooked position department of path pipe elbow test block is provided with the line cutting groove, and the line cutting groove is located the inner arc side of path pipe elbow test block, and the fluting direction in line cutting groove is mutually perpendicular with the axis of path pipe elbow test block.
The diameter of the small-diameter pipe elbow test block is 44.5mm, and the wall thickness of the small-diameter pipe elbow test block is 6.5 mm.
The depth of the wire cutting groove is 0.5mm, the length of the wire cutting groove is 5mm, and the width of the wire cutting groove is 0.2 mm.
The utility model discloses following beneficial effect has:
detection system of cambered surface circumference defect in path pipe elbow when concrete operation, utilize purpose-made contrast test block to carry out ultrasonic detection instrument's horizontal linear adjustment and detectivity earlier and set for, then under the detectivity condition of setting for, utilize ultrasonic detection instrument and probe to detect the path pipe elbow that awaits measuring, when the circumference defect reflection echo amplitude of the path pipe elbow that awaits measuring is higher than 80% full screen, then think that this path pipe elbow that awaits measuring has the defect, in order to realize carrying out the detection department to cambered surface circumference defect in the path pipe elbow, convenient operation, simply, adaptability is stronger.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of a reference block 1;
fig. 3 is a sectional view of the comparative block 1.
Wherein, 1 is a reference block, 2 is a linear cutting groove, 3 is an ultrasonic detection instrument, and 4 is a probe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
refer to fig. 1, fig. 2 and fig. 3, path pipe elbow internal arc surface circumference defect's detecting system include ultrasonic detection instrument 3, probe 4 and contrast test block 1, wherein, ultrasonic detection instrument 3 is connected with probe 4, contrast test block 1 includes path pipe elbow test block, path pipe elbow test block is the U-shaped structure, the crooked position department of path pipe elbow test block sets up wire cut groove 2, and wire cut groove 2 is located the inner arc side of path pipe elbow test block, the fluting direction of wire cut groove 2 is mutually perpendicular with the axis of path pipe elbow test block.
The diameter of the small-diameter pipe elbow test block is 44.5mm, and the wall thickness of the small-diameter pipe elbow test block is 6.5 mm; the depth of the wire cut groove 2 is 0.5mm, the length of the wire cut groove 2 is 5mm, and the width of the wire cut groove 2 is 0.2 mm. The ultrasonic detector 3 is an A-type pulse reflection ultrasonic detector; the frequency of the probe 4 is 5MHz, the number of the wafers is 1, the length and the width of each wafer are both 6mm, and the bottom surface of the sound transmission wedge of the probe 4 is a concave surface matched with the surface of the small-diameter pipe bend to be detected.
The utility model discloses specific operation process does:
1) cleaning the outer surface of the inner arc surface of the small-diameter pipe elbow to be detected;
2) coating a couplant on the surface of a reference block 1, placing a probe 4 on a straight pipe adjacent to the intrados of the reference block 1, wherein the propagation direction of a surface wave generated by the probe 4 is parallel to the axis of the reference block 1;
3) searching a reflection echo of the linear cutting groove 2 in the ultrasonic detection instrument 3, and adjusting a horizontal display value of the reflection echo on the ultrasonic detection instrument 3 to an actual distance between the linear cutting groove 2 and the probe 4;
4) setting the sensitivity of an ultrasonic detection instrument 3 as a linear cutting groove 2 for finding the reflection echo of the circumferential defect on the outer surface of the inner cambered surface of the small-diameter pipe elbow, wherein the depth of the reflection echo is more than or equal to 0.5 mm;
5) and (4) detecting the small-diameter pipe elbow to be detected under the detection sensitivity condition set in the step 4), and when the amplitude of the circumferential defect reflection echo of the small-diameter pipe elbow to be detected is higher than 80% of the full screen, determining that the small-diameter pipe elbow to be detected has a defect.
And (3) removing impurities, oil stains and water drops on the outer surface of the inner arc surface of the small-diameter pipe elbow to be detected in the step 1).
On the boiler heating surface tube panel of thermal power factory was applied to more to the footpath pipe return bend, because of the return bend range is compact, the conventional nondestructive test method can't detect return bend intrados surface circumference defect, uses the utility model discloses can successfully solve the limited difficult problem in detection space, have easy operation, detect fast and the defect detects high advantage.
Claims (3)
1. The utility model provides a detecting system of cambered surface circumference defect in path pipe elbow, a serial communication port, including ultrasonic detection instrument (3), probe (4) and comparison test block (1), wherein, ultrasonic detection instrument (3) are connected with probe (4), comparison test block (1) are including path pipe elbow test block, path pipe elbow test block is the U-shaped structure, path pipe elbow test block crooked position department sets up wire cut groove (2), and wire cut groove (2) are located the inner arc side of path pipe elbow test block, the fluting direction of wire cut groove (2) is mutually perpendicular with the axis of path pipe elbow test block.
2. The system of claim 1, wherein the small-diameter tube-bending test block has a diameter of 44.5mm and a wall thickness of 6.5 mm.
3. The system for detecting the circumferential defects of the inner arc surface of the small-diameter pipe elbow according to claim 1, wherein the depth of the linear cutting groove (2) is 0.5mm, the length of the linear cutting groove (2) is 5mm, and the width of the linear cutting groove (2) is 0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022036936.3U CN213398333U (en) | 2020-09-16 | 2020-09-16 | System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022036936.3U CN213398333U (en) | 2020-09-16 | 2020-09-16 | System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213398333U true CN213398333U (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022036936.3U Active CN213398333U (en) | 2020-09-16 | 2020-09-16 | System for detecting circumferential defects on inner arc surface of small-diameter pipe elbow |
Country Status (1)
| Country | Link |
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| CN (1) | CN213398333U (en) |
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2020
- 2020-09-16 CN CN202022036936.3U patent/CN213398333U/en active Active
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