CN202204783U - Microwave scanning detection device for hot melting connector of polyethylene pipeline - Google Patents
Microwave scanning detection device for hot melting connector of polyethylene pipeline Download PDFInfo
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- CN202204783U CN202204783U CN2011203400258U CN201120340025U CN202204783U CN 202204783 U CN202204783 U CN 202204783U CN 2011203400258 U CN2011203400258 U CN 2011203400258U CN 201120340025 U CN201120340025 U CN 201120340025U CN 202204783 U CN202204783 U CN 202204783U
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Abstract
The utility model relates to the detection field of pressure pipelines, in particular to a microwave scanning detection device for detecting welding quality of a hot melting connector of a polyethylene pipeline, which comprises a microwave probe, a mechanical scanning device, a scanning control system, a signal transformation system and a computer. One end of the microwave probe is arranged on the mechanical scanning device, and the other end of the microwave probe corresponds to the hot melting connector of the polyethylene pipeline. The mechanical scanning device is arranged beside the hot melting connector which is to be detected and arranged outside the polyethylene pipeline in the circumferential direction, the output end of the computer is connected with the mechanical scanning device through the scanning control system, and the output end of the microwave probe is connected with the input end of the computer through the signal transformation system. A detection device based on the detection device can detect defects of various types, and particularly can effectively detect cold welding and other technology defects. The microwave scanning detection device has the advantages of being high in sensitivity and detection accuracy, good in reliability and the like, and is easy and convenient to operate and low in cost.
Description
Technical field
The utility model relates to the detection range of pressure pipeline, specifically is a kind of microwave scanning detection apparatus of polyethylene pipe hot melt joint.
Background technology
Tygon (PE) pipeline has the performance of many brilliances, transmits resistivity etc. like low temperature resistant, corrosion-resistant, good toughness, cracking resistance, easy to connect, good anti-scraping ability, good quick crackle, and its life-span is 4 times of steel pipe in practice.Therefore, polyethylene pipe has become the optimal selection of city gas line network, mesolow water supply network.Method of attachment between the polyethylene pipe mainly contains hot melt butt joint (sweat soldering) and is connected two kinds with electric smelting.The technology of hot melt butt joint is more ripe, and connection charge is lower, therefore in present practical application, particularly uses the occasion in big nominal diameter tube road, and the connection of polyethylene pipe is main with the hot melt butt joint.The detailed process of hot melt docking calculation is following: at first the xsect end of polyvinyl piping materials is patted whole, again with heating plate heating connecting portion with certain pressure to molten condition; Remove heating plate then, exerting pressure firmly forces together two fusion end faces; Under the pressure stable effect that two parts connections are fixing at last, cool off until joint.Sweat soldering is owing to used hot tool, and two steps of the heating and melting of tubing and welding are separately carried out, and melt is prone to misplace during welding, thereby in the bigger internal stress of the inner generation of hot melting connector.Hot melt butt joint quality receives artificial factor bigger, so possibly there is various defective in the polyethylene pipe hot melt joint, mainly comprises crackle, incomplete fusion, pore, is mingled with, cold welding (cold weld) etc.Wherein, be difficulty to the detection of cold welding defective, because this defective generally can not cause the variation of joint macrostructure, such as forming the space, peeling off etc.The defective of joint is a very big threat to the security of polyethylene pipe, and most polyethylene pipe accidents are all caused by the joint defective.Therefore, improve the security of polyethylene pipe, joint defect inspection method and perfect joint man-rate method effectively reliably must be provided.
The detection method of existing polyethylene pipe hot melt joint mainly contains two types of destructive test and nondestructive tests.The destructive test of hot melting connector is the evaluation to welding bonding interface ability in essence.Destructive test is a kind of detection method of inspecting character by random samples, and present stage is used for the product development in hot-melt welding machine producer mostly.The main feeling the pulse with the finger-tip of the nondestructive test of hot melting connector is looked and is detected and ultrasound detection.Visual, detect and also do not form country or industry standard, detection method mainly forms according to engineering experience, only judges the quality quality through range estimation outward appearance and size during detection, can't observe the inherent vice of welding, and reliability is short of to some extent.Ultrasound detection can directly obtain the status information of material internal, can differentiate some gross imperfections, but relatively more difficult to the detection of manufacturability defective (like cold welding).Tygon is a kind of macromolecular material, compares metal material and can absorb and the more acoustic wave energy of loss, and because its texture ratio metal material is complicated, be easy to increase the scattering of sound wave, and these have all increased the difficulty of polyethylene pipe joint ultrasound detection.What is more important, ultrasonic method can't detect the manufacturability defective (like cold welding) that produces in the polyethylene pipe welding process effectively.In recent years, people such as Zheng Jinyang, Guo Weican utilize ultrasonic method that the polyethylene pipe electric fusion joint is detected, and have proposed " cold welding characteristic curve detection method ", can be used for the detection and the sign of cold welding defective.But,, do not find effective detection means at present yet for the present application detection of polyethylene pipe hot melt joint the most widely.
The utility model content
The purpose of the utility model is the deficiency that overcomes the above-mentioned background technology; A kind of microwave scanning detection apparatus of polyethylene pipe hot melt joint is provided; This pick-up unit has can detect polytype defective, detection sensitivity and advantages such as precision height, good reliability; Particularly can detect manufacturability defectives such as cold welding effectively, easy and simple to handle, cost is lower.
The technical scheme that the utility model provides:
A kind of microwave scanning detection apparatus of polyethylene pipe hot melt joint; This pick-up unit comprises: microwave probe, mechanical scanner, scanning control system, signal translating system, computing machine; One end of microwave probe is installed on the mechanical scanner, and the other end of microwave probe is corresponding with the hot melting connector of polyethylene pipe; Mechanical scanner is installed in the circumferentially outside seized hot melting connector of polyethylene pipe next door, and the output terminal of computing machine connects mechanical scanner through scanning control system, and the output terminal of microwave probe connects input end and computer through signal translating system.
The microwave scanning detection apparatus of described polyethylene pipe hot melt joint, microwave probe comprise a microwave emitter and A, two receiving sensors of B, and wherein two receiving sensors are placed side by side, the distance of 1/4 microwave wavelength of being separated by.
The microwave scanning detection apparatus of described polyethylene pipe hot melt joint, mechanical scanner comprise linear stepping motor and by linear stepping motor drive can reciprocating feeler lever, microwave probe is fixed on an end of feeler lever.
The microwave scanning detection apparatus of described polyethylene pipe hot melt joint; Signal translating system comprises position transducer, signal amplifier and digital-to-analog signal converter; Microwave probe is electrically connected with position transducer; The voltage signal output end of microwave probe is connected with signal amplifier, and the output terminal of position transducer and signal amplifier is connected with digital-to-analog signal converter, and the output terminal of digital-to-analog signal converter connects computing machine.
The microwave scanning detection method of the utility model polyethylene pipe hot melt joint; Detect the polyethylene pipe hot melt joint with the microwave scanister, the transmitter in the microwave probe is to tested joint launched microwave, and microwave is through two receiving sensor record baseline wave amplitudes; The penetration joints surface gets into its inside then; Defective in the material is regarded the medium with specific inductive capacity different with material around as, and when the microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave; The microwave signal that is reflected and the microwave signal of emission interfere; Receive and convert to voltage signal by receiving sensor; In input computing machine behind the scanning position information process signal translating system; Obtain scan image, obtain the relevant information of defective in the hot melting connector according to scan image.
The microwave scanning detection method of described polyethylene pipe hot melt joint, realize according to the following steps:
(1) microwave probe is positioned a side of the hot melting connector corresponding circle of sensation outside surface of polyethylene pipe;
(2) microwave probe carries out continuous sweep along the hot melting connector outside surface, and used microwave frequency is 1G-200GHz during detection;
(3) behind the signal process D/A switch of signal translating system that microwave probe obtains, the input computing machine is handled, and forms scan image.
The microwave scanning detection method of described polyethylene pipe hot melt joint, microwave probe carries out uniform speed scanning or variable speed scanning.
The microwave scanning detection method of described polyethylene pipe hot melt joint when the polyethylene pipe hot melt joint is scanned, avoids the use of couplant.
The microwave scanning detection method of described polyethylene pipe hot melt joint, microwave probe and hot melting connector outside surface carry out contact scanning; Perhaps, adopt microwave probe to scan near the mode of hot melting connector outside surface.
The microwave scanning detection method of described polyethylene pipe hot melt joint, the distance between microwave probe and the joint outside surface is controlled at 1-5cm.
The principle of the utility model is following:
Microwave is the electromagnetic wave of a kind of frequency range between 0.3-300GHz (being preferably 1G-200GHz), when microwave when a kind of medium enters into another kind and has the medium of differing dielectric constant, the difference of two media specific inductive capacity makes microwave that reflection or refraction take place.Defective in the material can be regarded as the medium with specific inductive capacity different with material around, and when the microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal of reflected signal and emission interferes, and is transformed into voltage signal through microwave probe, obtains scan image through signal amplification and digitizing transformation again.
Compared with prior art, the advantage of the utility model:
Detection method that the utility model provides and pick-up unit can effectively detect various types of defectives of polyethylene pipe hot melt joint reliably, and concrete advantage is following:
(1) equates that with ultrasound detection, the roentgenogram of routine lossless detection method compares; The utility model adopts Microwave Measurement to realize the effective coupling from the tested hot melting connector of popping one's head in through air; Therefore need not use couplant, the material contamination problem that can avoid couplant to bring;
(2) the utility model adopts microwave easily through air borne, can not cause obscuring of a series of reflections because of this propagation medium of air;
(3) its amplitude of microwave during the utility model is propagated and the information ratio of phase place are easier to obtain;
(4) the utility model does not require the physics contact between probe and tested joint, and surface in contact is not implemented fast detecting;
(5) the utility model microwave probe can be formed with solid-state devices, not only firmly but also reliable;
(6) the utility model can detect various volume type defectives and the area-type defective in the hot melting connector effectively; Especially can detect effectively such as the such manufacturability defective of cold welding defective, this be other lossless detection method (ultrasonic, ray etc.) can't realize.
(7) the Microwave Measurement technology is a kind of novel detection technique that begins to grow up gradually the nineties in last century, is mainly used in the detection to dielectric material, like fibre reinforced composites pipeline, rubber expansion joint, composite ceramic slab etc.At home, do not see the report of relevant microwave technology at present as yet, do not see the report of Microwave Measurement polyethylene pipe joint relevant device yet the detection of polyethylene pipe joint.Therefore, the enforcement of the utility model is expected to fill up the domestic blank in this field.
Description of drawings
Fig. 1 is the theory diagram of the pick-up unit that provides of the utility model.
Fig. 2 is the user mode synoptic diagram of the pick-up unit that provides of the utility model.
Fig. 3 is the detection principle schematic of the pick-up unit that provides of the utility model.
Among the figure, 1 polyethylene pipe; 2 hot melting connectors; 3 microwave probes; 4 feeler levers; 5 mechanical scanners; 6 scanning control systems; 7 signal translating systems; 8 computing machines; 9 transmitters; 10 tested joints; 11 receiving sensors; 12 defectives.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model.
Shown in Fig. 1-2; The hot melting connector 2 microwave scanning detection apparatus of the utility model polyethylene pipe 1; Comprise: microwave probe 3, mechanical scanner 5, scanning control system 6, signal translating system 7, computing machine 8 etc.; One end of microwave probe 3 is installed on the mechanical scanner 5, and the other end of microwave probe 3 is corresponding with the hot melting connector 2 of polyethylene pipe 1; Mechanical scanner 5 is installed in polyethylene pipe 1 circumferential outside seized hot melting connector 2 next doors, and mechanical scanner 5 drives the scanning of microwave probe 3 motion realization; The output terminal of computing machine 8 connects mechanical scanner 5 through cable through scanning control system 6, controls moving of mechanical scanner and microwave probe; The output terminal of microwave probe 3 is through the input end of cable through signal translating system 7 connection computing machines 8, and signal translating system 7 receives voltage signal and the scanning position information that is transmitted by microwave probe 3, and carries out conversion of signals, so that form scan image; Computing machine 8 is realized real time imagery and is utilized software that image is analyzed;
In the utility model; Microwave probe 3 comprises a microwave emitter 9 and A, two receiving sensors 11 of B; Wherein two receiving sensors are placed side by side; The distance (Fig. 3) of 1/4 microwave wavelength of being separated by produces an interference pattern respectively during work, the differential information of two interference patterns forms scan image through signal translating system input computing machine.
In the utility model; Mechanical scanner 5 comprise linear stepping motor and by linear stepping motor drive can reciprocating feeler lever 4; Microwave probe 3 is fixed on an end of feeler lever 4, makes the microwave probe 3 can be along the outside surface reciprocating (Fig. 2) of the hot melting connector 2 of polyethylene pipe 1.
In the utility model; Signal translating system 7 is made up of position transducer, signal amplifier and digital-to-analog signal converter; Microwave probe 3 is electrically connected with position transducer, and the voltage signal output end of microwave probe 3 is connected with signal amplifier, and voltage signal is amplified; The output terminal of position transducer and signal amplifier is connected with digital-to-analog signal converter, and the output terminal of digital-to-analog signal converter connects computing machine 8.
As shown in Figure 3; When detecting the polyethylene pipe hot melt joint with the microwave scanister, the transmitter 9 in the microwave probe 3 is to tested joint 10 launched microwaves, and microwave is through two receiving sensors 11 (A, B) record baseline wave amplitude; The penetration joints surface gets into its inside then; Defective in the material can be regarded as the medium with specific inductive capacity different with material around, and when the microwave in advancing ran into defective 12, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern, receive and convert to voltage signal by receiving sensor, through in the input computing machine behind the signal translating system, obtain scan image together with scanning position information.Can obtain the relevant information of defective in the hot melting connector according to scan image.
Shown in Fig. 1-3, the microwave scanning detection method of the utility model polyethylene pipe hot melt joint, realize according to the following steps:
(1) microwave probe 3 is positioned a side of the hot melting connector 2 corresponding circle of sensation outside surfaces of polyethylene pipe 1;
(2) microwave probe 3 carries out continuous sweep along hot melting connector 2 outside surfaces, but uniform speed scanning, also variable-ratio scanning, sweep velocity is 2-30cm/s, detecting used microwave frequency is 1G-200GHz; When the polyethylene pipe hot melt joint is scanned, without any need for couplant; Microwave probe 3 can carry out contact scanning with hot melting connector 2 outside surfaces, also can scan near the mode of hot melting connector 2 outside surfaces.
(3) microwave signal that obtains of microwave probe 3 is through signal translating system 7, carry out conversion of signals after, input computing machine 8 is handled, and forms scan image.
Embodiment 1
The microwave detecting device that uses the utility model to provide detects an intact sunken polyethylene pipe hot melt joint.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 10cm/s, and the distance between microwave probe and the joint outside surface is controlled at 3cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude scan image of this hot melting connector all compares evenly at whole axial direction, almost not fluctuation.
Embodiment 2
Use microwave detecting device that the utility model provides to one contain the cold welding defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 15cm/s, and the distance between microwave probe and the joint outside surface is controlled at 2cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern, are reference example with embodiment 1, the obvious broad of the heat affected zone of this hot melting connector, and midline position departs from, and image intensity fluctuates, the discontinuous phenomenon of local appearance.
Use microwave detecting device that the utility model provides to exert pressure excessive when the butt joint and polyethylene pipe hot melt joint that form detects to one.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 14cm/s, and the distance between microwave probe and the joint outside surface is controlled at 4cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern, are reference example with embodiment 1, and the heat affected zone of this hot melting connector is obviously narrower, is about 0.15 inch.
Embodiment 4
Use microwave detecting device that the utility model provides to one contain the incomplete fusion defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 20cm/s, and the distance between microwave probe and the joint outside surface is controlled at 3cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern, are reference example with embodiment 1, the heat affected zone broad of this hot melting connector, and midline position departs from, and significantly inhomogeneous and discontinuous (disappearance) phenomenon appears in image.
Embodiment 5
Use microwave detecting device that the utility model provides to one contain the cold welding defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 8cm/s, and the distance between microwave probe and the joint outside surface is controlled at 2cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern.With embodiment 1 is reference example, the obvious broad of the heat affected zone of this hot melting connector, and midline position departs from, and image intensity fluctuates, the discontinuous phenomenon of local appearance.
Embodiment 6
Use microwave detecting device that the utility model provides to one contain the cold welding defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 20cm/s, and the distance between microwave probe and the joint outside surface is controlled at 2cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern.With embodiment 1 is reference example, the obvious broad of the heat affected zone of this hot melting connector, and midline position departs from, and image intensity fluctuates, the discontinuous phenomenon of local appearance.
Embodiment 7
Use microwave detecting device that the utility model provides to one contain the incomplete fusion defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 14cm/s, and the distance between microwave probe and the joint outside surface is controlled at 3cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern.With embodiment 1 is reference example, the heat affected zone broad of this hot melting connector, and midline position departs from, and significantly inhomogeneous and discontinuous (disappearance) phenomenon appears in image.
Embodiment 8
Use microwave detecting device that the utility model provides to one contain the incomplete fusion defective the polyethylene pipe hot melt joint detect.Elder generation's butt junction outside surface carries out simple process; Make its smooth; Step butt junction in the technical scheme that provides according to the utility model then detects, and the microwave frequency of using is 24GHz, adopts uniform speed scanning; Sweep velocity is 16cm/s, and the distance between microwave probe and the joint outside surface is controlled at 3cm; In the present embodiment, the signal of receiving sensor A, B record shows respectively that through the baseline wave amplitude when microwave in advancing ran into defective, the variation of specific inductive capacity was reflected microwave.The microwave signal that is reflected and the microwave signal of emission form interference pattern.With embodiment 1 is reference example, the heat affected zone broad of this hot melting connector, and midline position departs from, and significantly inhomogeneous and discontinuous (disappearance) phenomenon appears in image.
Should be understood that these embodiment only are used to explain the utility model, and be not used in the scope of restriction the utility model.Should be understood that in addition those skilled in the art do various changes or modification to the utility model, these equivalent form of values fall within the limited range of this utility model equally.
Claims (4)
1. the microwave scanning detection apparatus of a polyethylene pipe hot melt joint; It is characterized in that; This pick-up unit comprises: microwave probe, mechanical scanner, scanning control system, signal translating system, computing machine; One end of microwave probe is installed on the mechanical scanner, and the other end of microwave probe is corresponding with the hot melting connector of polyethylene pipe; Mechanical scanner is installed in the circumferentially outside seized hot melting connector of polyethylene pipe next door, and the output terminal of computing machine connects mechanical scanner through scanning control system, and the output terminal of microwave probe connects input end and computer through signal translating system.
2. according to the microwave scanning detection apparatus of the described polyethylene pipe hot melt joint of claim 1; It is characterized in that; Microwave probe comprises a microwave emitter and A, two receiving sensors of B, and wherein two receiving sensors are placed side by side, the distance of 1/4 microwave wavelength of being separated by.
3. according to the microwave scanning detection apparatus of the described polyethylene pipe hot melt joint of claim 1; It is characterized in that; Mechanical scanner comprise linear stepping motor and by linear stepping motor drive can reciprocating feeler lever, microwave probe is fixed on an end of feeler lever.
4. according to the microwave scanning detection apparatus of the described polyethylene pipe hot melt joint of claim 1; It is characterized in that; Signal translating system comprises position transducer, signal amplifier and digital-to-analog signal converter, and microwave probe is electrically connected with position transducer, and the voltage signal output end of microwave probe is connected with signal amplifier; The output terminal of position transducer and signal amplifier is connected with digital-to-analog signal converter, and the output terminal of digital-to-analog signal converter connects computing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203400258U CN202204783U (en) | 2011-09-09 | 2011-09-09 | Microwave scanning detection device for hot melting connector of polyethylene pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203400258U CN202204783U (en) | 2011-09-09 | 2011-09-09 | Microwave scanning detection device for hot melting connector of polyethylene pipeline |
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| CN202204783U true CN202204783U (en) | 2012-04-25 |
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| CN2011203400258U Expired - Fee Related CN202204783U (en) | 2011-09-09 | 2011-09-09 | Microwave scanning detection device for hot melting connector of polyethylene pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384919A (en) * | 2011-09-09 | 2012-03-21 | 嘉兴市特种设备检测院 | Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint |
| CN112198172A (en) * | 2020-09-30 | 2021-01-08 | 中铁大桥局集团有限公司 | Bridge inhaul cable steel wire damage detection method and detection device |
-
2011
- 2011-09-09 CN CN2011203400258U patent/CN202204783U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384919A (en) * | 2011-09-09 | 2012-03-21 | 嘉兴市特种设备检测院 | Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint |
| CN102384919B (en) * | 2011-09-09 | 2013-01-09 | 嘉兴市特种设备检测院 | Microwave scanning detection method and microwave detection device of polyethylene pipe hot-molten joint |
| CN112198172A (en) * | 2020-09-30 | 2021-01-08 | 中铁大桥局集团有限公司 | Bridge inhaul cable steel wire damage detection method and detection device |
| CN112198172B (en) * | 2020-09-30 | 2022-06-07 | 中铁大桥局集团有限公司 | Bridge inhaul cable steel wire damage detection method and detection device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20200909 |
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