CN110940735A - Strain clamp and ultrasonic detection method for crimping quality of strain clamp and steel-cored aluminum strand - Google Patents
Strain clamp and ultrasonic detection method for crimping quality of strain clamp and steel-cored aluminum strand Download PDFInfo
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- CN110940735A CN110940735A CN201911265625.XA CN201911265625A CN110940735A CN 110940735 A CN110940735 A CN 110940735A CN 201911265625 A CN201911265625 A CN 201911265625A CN 110940735 A CN110940735 A CN 110940735A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2698—Other discrete objects, e.g. bricks
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Abstract
The invention relates to a strain clamp and an ultrasonic detection method for the compression joint quality of the strain clamp and a steel-cored aluminum strand, belonging to the field of nondestructive detection. Establishing a model, obtaining a reference signal by using the same test working condition as the actual test, detecting a test piece to be tested, obtaining an ultrasonic echo signal time sequence, measuring an actual ultrasonic echo signal of the test piece to be tested, and obtaining an actual measurement signal; and comparing the actually measured signal time domain sequence with the reference signal time domain sequence to obtain the strain clamp and the detection result of the crimping quality of the strain clamp and the steel-cored aluminum strand. The method has the advantages that the energy sequence is obtained through the time domain sequence of the ultrasonic guided wave echo of the aluminum pipe, the steel-cored aluminum strand and the steel anchor crimping structure, and the crimping quality can be effectively detected in a region by comparing the energy sequence with the structural reference echo without defects, so that the method is simple and convenient to realize, is a method with practical value, and can use higher test frequency.
Description
Technical Field
The invention belongs to the field of nondestructive testing, and particularly relates to a strain clamp and an ultrasonic testing method for the crimping quality of the strain clamp and a steel-cored aluminum strand.
Background
In overhead transmission lines, strain clamps are mostly used to connect terminals of steel-cored aluminum strands or to fix strain section wires. The aluminum pipe and the steel anchor form a strain clamp together, the aluminum pipe is connected with the steel-cored aluminum stranded wire, the aluminum pipe and the steel anchor are subjected to compression molding in a hydraulic or explosive compression mode, and the wire and the strain clamp are combined into a whole, so that the strain clamp can bear the tension of the wire and also realize a current-carrying task. The crimping quality of the strain clamp is directly related to the safe and stable operation of the power transmission line. When the line runs in conditions of strong wind waving, ice coating, breeze vibration and the like, the strain clamp is easy to break, thereby causing the line drop accident. The crimping quality problem of the strain clamp is found in advance through detection, defect elimination processing is carried out in time, the operation accident of the power transmission line caused by the crimping quality problem can be effectively avoided, and the safe and stable operation of the power transmission line is guaranteed. Therefore, the research on the quality detection technology of the strain clamp of the power transmission line is especially necessary.
Disclosure of Invention
The invention provides a strain clamp and an ultrasonic detection method for the crimping quality of the strain clamp and a steel-cored aluminum strand, which are used for identifying the crimping state of a steel-cored wire and a steel anchor pipe through an ultrasonic B scanning imaging technology and distinguishing whether the crimping is qualified or not.
The technical scheme adopted by the invention is as follows: comprises the following steps:
(1) establishing a mathematical model of a pulse ultrasonic propagation path in the aluminum pipe, core wire and steel anchor crimping structure, expressing the crimping condition by using a time domain sequence of a reflection signal,
(2) detecting the echo of the standard contrast sample by using the same test working condition as the actual test to obtain an ultrasonic time domain echo signal which is well crimped and is called as a reference signal;
(3) detecting a test piece to be detected through an actual test system to obtain an ultrasonic echo signal time sequence;
(4) under the same test working condition, measuring an actual ultrasonic echo signal of the to-be-tested part to obtain an actual measurement signal;
(5) and comparing the actually measured signal time domain sequence with the reference signal time domain sequence to obtain the strain clamp and the detection result of the crimping quality of the strain clamp and the steel-cored aluminum strand.
The invention adopts a B-type pulse reflection type digital ultrasonic flaw detector, the working frequency range of the ultrasonic flaw detector is 1 MHz-15 MHz, and the ultrasonic flaw detector has continuous adjustable attenuation of more than 80 dB.
The horizontal linear error of the ultrasonic flaw detector adopted by the invention is not more than 1%, the vertical linear error is not more than 5%, and the real-time sampling frequency is not less than 200 MHz.
The invention uses the phased array ultrasonic transducer to make the acoustic energy concentrated at the detection point by emitting the focusing acoustic beam, thereby realizing high detection resolution.
The structure of the standard comparative sample used in the invention is as follows: the aluminum pipe comprises a steel-cored aluminum strand connecting section and a steel anchor connecting section, wherein the steel-cored aluminum strand connecting section is in compression joint with the steel-cored aluminum strand through a compression joint area at the front end of the steel-cored aluminum strand connecting section, and a non-compression joint area is tightly matched with the steel-cored aluminum strand; the steel anchor connecting section of the aluminum pipe comprises a steel anchor compression joint section and a steel anchor non-compression joint section, inward depressions are formed in the steel anchor compression joint section, grooves are formed in the steel anchors, the depressions are respectively located in the corresponding grooves, the length of each depression is greater than 80-90% of the depth of each steel anchor groove, and the length of each depression is smaller than 80-90% of the depth of each steel anchor groove.
The length of the non-compression joint area of the aluminum pipe 1 is 1/6-1/3 of the length of the steel-cored aluminum strand connecting section.
The shape of the steel-cored aluminum strand connecting section of the aluminum pipe is regular hexagon.
The shape of the compression joint section of the aluminum pipe and the steel anchor is regular hexagon.
The method has the advantages that the principle is clear, the energy sequence is obtained through the time domain sequence of the ultrasonic guided wave echo of the aluminum pipe, the steel-cored aluminum stranded wire and the steel anchor crimping structure, the crimping quality can be effectively detected in a region by comparing the energy sequence with the structural reference echo without defects, the method is simple and convenient to realize, the operation of detection personnel is easy, the method is a method with practical value, the ultrasonic B scanning technology can realize ultrasonic imaging detection, the signal-to-noise ratio can be greatly improved when materials with the same sound attenuation characteristic are detected, and higher test frequency can be used.
Drawings
FIG. 1 is a schematic structural view of a standard comparative sample of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
FIG. 4 is a perspective view of the present invention;
FIG. 5 is a B-scan imaging view of a steel-cored aluminum strand connecting section of an aluminum pipe according to an experimental example of the present invention;
fig. 6 is a B-scan imaging of the steel anchor crimping section of the experimental example of the present invention.
Detailed Description
Comprises the following steps:
(1) establishing a mathematical model of a pulse ultrasonic propagation path in the aluminum pipe, core wire and steel anchor crimping structure, expressing the crimping condition by using a time domain sequence of a reflection signal,
(2) detecting the echo of the standard contrast sample by using the same test working condition as the actual test to obtain an ultrasonic time domain echo signal which is well crimped and is called as a reference signal;
(3) detecting a test piece to be detected through an actual test system to obtain an ultrasonic echo signal time sequence;
(4) under the same test working condition, measuring an actual ultrasonic echo signal of the to-be-tested part to obtain an actual measurement signal;
(5) and comparing the actually measured signal time domain sequence with the reference signal time domain sequence to obtain the strain clamp and the detection result of the crimping quality of the strain clamp and the steel-cored aluminum strand.
The invention adopts a B-type pulse reflection type digital ultrasonic flaw detector, the working frequency range of the ultrasonic flaw detector is 1 MHz-15 MHz, and the ultrasonic flaw detector has continuous adjustable attenuation of more than 80 dB.
The horizontal linear error of the ultrasonic flaw detector adopted by the invention is not more than 1%, the vertical linear error is not more than 5%, and the real-time sampling frequency is not less than 200 MHz.
The invention uses the phased array ultrasonic transducer to make the acoustic energy concentrated at the detection point by emitting the focusing acoustic beam, thereby realizing high detection resolution.
The structure of the standard comparative sample used in the invention is as follows: the aluminum pipe comprises an aluminum pipe 1, an aluminum conductor steel reinforced 2 and a steel anchor 3, wherein the aluminum pipe 1 comprises a steel conductor steel reinforced connecting section 101 and a steel anchor connecting section 102, the steel conductor steel reinforced connecting section 101 is in compression joint with the aluminum conductor steel reinforced 2 through a compression joint area 10101 at the front end of the steel conductor steel reinforced connecting section, and a non-compression joint area 10102 is tightly matched with the aluminum conductor steel reinforced 2; the steel anchor connecting section 102 of the aluminum pipe 1 comprises a steel anchor compression joint section 10201 and a steel anchor non-compression joint section 10202, wherein the steel anchor compression joint section 10201 is provided with an inward recess 10203, the steel anchor 3 is provided with a groove 301, the recesses 10203 are respectively positioned in the corresponding grooves 301, the length of at least two recesses 10203 is greater than 80-90% of the depth of the first groove 301 of the steel anchor, and the length of one recess 10203 is less than 80-90% of the depth of the second groove 302 of the steel anchor;
the length of the non-crimping area 10102 of the aluminum pipe 1 is 1/6-1/3 of the length of the steel-cored aluminum strand connecting section 101;
the shape of the steel-cored aluminum strand connecting section 101 of the aluminum pipe 1 is a regular hexagon;
the shape of the section 10201 of the aluminum pipe 1 which is in compression joint with the steel anchor is a regular hexagon.
As shown in fig. 1, the detection surfaces of the steel-cored aluminum strand connecting section 101 and the steel anchor compression joint section 10201 of the aluminum pipe 1 are hexagonal, and the surface of any one surface is smooth and suitable for ultrasonic wave incidence, so that any one surface can be used as the detection surface. During detection, the probe is placed on the detection surface of the steel-cored aluminum strand connecting section 101 or the steel anchor compression joint section 10201 of the aluminum pipe 1, and parallel scanning is performed leftwards; recording and processing the scanning result, and providing the result for a corresponding detection instrument to use;
the defect manufacturing method in the steel-cored aluminum strand connecting section 101 of the aluminum pipe 1 comprises the following steps: the aluminum pipe in the section is not crimped with 1/3 parts in the crimping surface of the steel-cored aluminum strand, the 2/3 parts are crimped according to the standard crimping process, and when the length of the non-crimped part exceeds 1/6-1/3 during setting detection, the product has defects and cannot meet the use requirements;
the method for manufacturing the defects in the steel anchor crimping section 10201 comprises the following steps: the compression joint depth of two dents of the aluminum pipe and the steel anchor groove in the section is greater than 80-90% of the depth of the first steel anchor groove, and the depth of the other dent is less than 80-90% of the depth of the second steel anchor groove; wherein, the part with the compression joint depth less than 80-90% is determined as the compression joint defect, and the product does not meet the use requirement.
The present invention is further illustrated by the following specific experimental examples.
1. Preparation for detection
(1) Before detection, the name of the equipment, the structure type, the specification, the material and the like of the strain clamp can be known; the relevant quality data of factory and installation of the manufacturing plant should be consulted; checking the product identification of the strain clamp to be checked;
(2) the surface roughness (Ra) of the detection surface is preferably not more than 10 μm, and the detection surface is required to be clean and free of dirt;
(3) the coupling agent should have good sound transmission performance and wetting capacity, and be harmless to workpieces and easy to remove. Preferably selecting a water-based coupling agent prepared from sodium carboxymethylcellulose and derivatives thereof;
2. selection of probe
The frequency and the wafer size of the probe are selected according to the thickness of the strain clamp sleeve to be detected. A narrow pulse (1.5 period is optimal) longitudinal wave probe with the diameter phi of 5mm and 10MHz is recommended;
3. adjustment of baseline ratio during scanning
The reflected wave of the first interface at the joint of the strain clamp sleeve and the lead and the steel anchor material is adjusted to be 20-30% of the full scale of the time base line;
4. sensitivity of detection
The probe is arranged at the non-pressed and combined part of the reference test block strain clamp sleeve, the lead and the steel anchor material, and the bottom wave is adjusted to 80% of the full screen;
5. detection of
(1) The detection is carried out on a strain clamp crimping plane;
(2) the probe should be well coupled with the detection surface;
(3) the scanning speed is not more than 100 mm/s;
(4) typical reflected echo and scan images are shown in figures 5 and 6.
6. Evaluation of test results
(1) The area (shown in figure 5) where the primary bottom wave is displayed in a flat line shape on the scanning image B through area detection is an area L0 where the crimping of the lead and the aluminum alloy sleeve is not completed, the area (shown in figure 5) where the primary bottom wave is displayed in a curve shape and the curve fluctuation range is more than one third of the period is an area L1 where the crimping of the lead and the aluminum alloy sleeve is completed, the area L1 where the crimping is completed is larger than the requirement of the installation process of the strain clamp, and otherwise, the area is judged to be unqualified;
(2) the zone B detects that the bottom wave on the B scanning image shows a straight line shape, and when the recess number of the aluminum alloy sleeve is not consistent with the recess number of the steel anchor or the recess size is less than 80% of the recess depth (as shown in figure 6), the zone L where the steel anchor and the aluminum alloy sleeve are not well pressed is formed0When the primary bottom wave appears in the shape of a groove, the number of the depressions of the aluminum alloy sleeve conforms to the number of the grooves of the steel anchor and the depression size is more than 80% of the depth of the groove (as shown in figure 6), the steel anchor and the aluminum alloy sleeve are well pressed and connected in an area L1Area L of good crimping1The mounting process requirement of the strain clamp is required to be greater, otherwise, the strain clamp is judged to be unqualified;
7. recording
The original record is made for each detection, and the detection result is recorded in detail, and the record content at least comprises the following information.
Claims (8)
1. A strain clamp and an ultrasonic detection method for the compression joint quality of the strain clamp and a steel-cored aluminum strand are characterized by comprising the following steps:
(1) establishing a mathematical model of a pulse ultrasonic propagation path in the aluminum pipe, core wire and steel anchor crimping structure, expressing the crimping condition by using a time domain sequence of a reflection signal,
(2) detecting the echo of the standard contrast sample by using the same test working condition as the actual test to obtain an ultrasonic time domain echo signal which is well crimped and is called as a reference signal;
(3) detecting a test piece to be detected through an actual test system to obtain an ultrasonic echo signal time sequence;
(4) under the same test working condition, measuring an actual ultrasonic echo signal of the to-be-tested part to obtain an actual measurement signal;
(5) and comparing the actually measured signal time domain sequence with the reference signal time domain sequence to obtain the strain clamp and the detection result of the crimping quality of the strain clamp and the steel-cored aluminum strand.
2. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 1, which is characterized in that: the B-type pulse reflection type digital ultrasonic flaw detector is adopted, the working frequency range of the ultrasonic flaw detector is 1 MHz-15 MHz, and the ultrasonic flaw detector has continuous adjustable attenuation of more than 80 dB.
3. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 1, which is characterized in that: the horizontal linear error of the adopted ultrasonic flaw detector is not more than 1 percent, the vertical linear error is not more than 5 percent, and the real-time sampling frequency is not less than 200 MHz.
4. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 1, which is characterized in that: the phased array ultrasonic transducer is used for emitting a focused sound beam to enable sound energy to be concentrated at a detection point, so that high detection resolution is realized.
5. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 1, which is characterized in that: the structure of the standard control sample used was: the aluminum pipe comprises a steel-cored aluminum strand connecting section and a steel anchor connecting section, wherein the steel-cored aluminum strand connecting section is in compression joint with the steel-cored aluminum strand through a compression joint area at the front end of the steel-cored aluminum strand connecting section, and a non-compression joint area is tightly matched with the steel-cored aluminum strand; the steel anchor connecting section of the aluminum pipe comprises a steel anchor compression joint section and a steel anchor non-compression joint section, inward depressions are formed in the steel anchor compression joint section, grooves are formed in the steel anchors, the depressions are respectively located in the corresponding grooves, the length of each depression is greater than 80-90% of the depth of each steel anchor groove, and the length of each depression is smaller than 80-90% of the depth of each steel anchor groove.
6. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 5, wherein the ultrasonic testing method comprises the following steps: the length of the non-compression joint area of the aluminum pipe 1 is 1/6-1/3 of the length of the steel-cored aluminum strand connecting section.
7. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 5, wherein the ultrasonic testing method comprises the following steps: the shape of the steel-cored aluminum strand connecting section of the aluminum pipe is regular hexagon.
8. The ultrasonic testing method for the compression joint quality of the strain clamp and the steel-cored aluminum strand as claimed in claim 5, wherein the ultrasonic testing method comprises the following steps: the shape of the compression joint section of the aluminum pipe and the steel anchor is regular hexagon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911265625.XA CN110940735A (en) | 2019-12-11 | 2019-12-11 | Strain clamp and ultrasonic detection method for crimping quality of strain clamp and steel-cored aluminum strand |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911265625.XA CN110940735A (en) | 2019-12-11 | 2019-12-11 | Strain clamp and ultrasonic detection method for crimping quality of strain clamp and steel-cored aluminum strand |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505153A (en) * | 2020-08-25 | 2021-03-16 | 广西电网有限责任公司电力科学研究院 | Technical feasibility analysis method and system for strain clamp crimping quality inspection |
| CN114894131A (en) * | 2022-04-08 | 2022-08-12 | 三峡大学 | Detection method for crimping of strain clamp lead |
| CN115728307A (en) * | 2022-11-15 | 2023-03-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Strain clamp crimping acceptance tool |
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| CN1865980A (en) * | 2006-05-23 | 2006-11-22 | 江苏大学 | Ultrasonic detection method for near surface defect |
| US20140173887A1 (en) * | 2011-02-01 | 2014-06-26 | Tyco Electronics Corporation | Process for Nondestructive Evaluation of the Quality of a Crimped Wire Connector |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865980A (en) * | 2006-05-23 | 2006-11-22 | 江苏大学 | Ultrasonic detection method for near surface defect |
| US20140173887A1 (en) * | 2011-02-01 | 2014-06-26 | Tyco Electronics Corporation | Process for Nondestructive Evaluation of the Quality of a Crimped Wire Connector |
Non-Patent Citations (1)
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| 杨再贵 等: "基于超声成像技术的耐张线夹压接质量评价研究", 《科学大众》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505153A (en) * | 2020-08-25 | 2021-03-16 | 广西电网有限责任公司电力科学研究院 | Technical feasibility analysis method and system for strain clamp crimping quality inspection |
| CN112505153B (en) * | 2020-08-25 | 2023-06-20 | 广西电网有限责任公司电力科学研究院 | Technical feasibility analysis method and system for strain clamp crimping quality inspection |
| CN114894131A (en) * | 2022-04-08 | 2022-08-12 | 三峡大学 | Detection method for crimping of strain clamp lead |
| CN114894131B (en) * | 2022-04-08 | 2024-03-12 | 三峡大学 | Method for detecting wire crimping of strain clamp |
| CN115728307A (en) * | 2022-11-15 | 2023-03-03 | 中国南方电网有限责任公司超高压输电公司广州局 | Strain clamp crimping acceptance tool |
| CN115728307B (en) * | 2022-11-15 | 2024-05-31 | 中国南方电网有限责任公司超高压输电公司广州局 | Strain clamp crimping acceptance tool |
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Application publication date: 20200331 |