CN203164137U - Microwave transmission detection device of polyethylene pipeline welding joint - Google Patents
Microwave transmission detection device of polyethylene pipeline welding joint Download PDFInfo
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- CN203164137U CN203164137U CN 201320070119 CN201320070119U CN203164137U CN 203164137 U CN203164137 U CN 203164137U CN 201320070119 CN201320070119 CN 201320070119 CN 201320070119 U CN201320070119 U CN 201320070119U CN 203164137 U CN203164137 U CN 203164137U
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Abstract
The utility model relates to the field of pressure pipeline detection, in particular to a microwave transmission detection device of a polyethylene pipeline welding joint. The microwave detection device comprises a microwave probe comprising a microwave transmitter, a microwave receiving antenna comprising a microwave sensor, a signal conversion system, a single-chip computer or a computer and a connecting cable. In detection, the microwave probe transmits microwaves to a welding joint to be detected, the microwaves penetrate through the surface of the joint and enter the inside of the joint, and parameters such as a phase position and amplitude change when the microwaves pass through defects; and the microwaves penetrating through the joint are received by the microwave receiving antenna positioned at the other side of the pipeline and converted into electrical signals which pass through the signal conversion system together with transmitting wave signals and then are input into the single-chip computer or the computer to obtain a microwave waveform graph, and related information of the defects of the welding joint can be obtained according to the waveform graph. The microwave transmission detection device has the advantages of high detection sensitivity and precision, good reliability and the like, can be used for effectively detecting process defects, and can be used for on-site detection.
Description
Technical field
The utility model relates to the detection range of pressure pipeline, specifically is a kind of microwave transmission pick-up unit of polyethylene pipe welding joint defective.
Background technology
(polyethylene, PE) pipeline is widely used in the transmission of danger medium such as combustion gas to tygon.The polyethylene gas pipe road has the performance of many brilliances, as low temperature resistant, corrosion-resistant, good toughness, cracking resistance, (electric smelting connection and hot melt butt joint) easy to connect, and good anti-scratch ability, good crackle transmits resistivity etc., and serviceable life is longer.Connection between the polyvinyl piping materials is the important step that influences its structural intergrity and creep rupture strength, so the trouble free service of fuel gas polyethylene pipeline system and its joint quality are closely bound up.Method of attachment between the polyethylene pipe mainly contains sweat soldering and electric smelting is welded two kinds.The technology maturation of sweat soldering, connection charge is lower, and is comparatively common in the occasion of using big nominal diameter tube road.The technological parameter of sweat soldering is more, and constructing operation is comparatively complicated, and the quality of joint and operator's weld horizontal and empirical relationship are very big.Electric smelting when welding welding occurs in after the link assembling and positioning, during the joint welding motion of melt very limited, the internal stress of generation is less.Easy grasp simple to operate is welded in electric smelting, the operating efficiency height, and welding quality is subjected to artificial factor less, is adapted at the less pipeline of nominal diameter and connects upward use, and bright development prospect is arranged.
May there be various defective in polyethylene pipe welding joint place, mainly comprises crackle, pore, is mingled with, incomplete fusion, cold welding etc.Wherein, be the most difficult to the detection of the such manufacturability defective of incomplete fusion and cold welding, because this defective does not generally show as the variation of joint macrostructure, but the quality of butt junction and performance can produce very big influence.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 relevant device effectively reliably must be provided.
The detection method of existing polyethylene pipe welding joint mainly contains destructive test and nondestructive test two classes.The destructive test of joint is the evaluation to welding bonding interface ability in essence, and present stage is used for the product development of welding machine producer mostly, and the main feeling the pulse with the finger-tip inspection of nondestructive test is surveyed and Ultrasonic Detection.Visual detection does not also form country or industry standard at present, and detection method mainly forms according to engineering experience, lacks reliability.Ultrasonic Detection can directly obtain the status information of material internal, can differentiate some gross imperfections, but tygon is a kind of macromolecular material, comparing metal material can absorb and the more acoustic wave energy of loss, and because its structure is than metal material complexity, be easy to increase the scattering of sound wave, these have all increased the difficulty of polyethylene pipe joint Ultrasonic Detection greatly.The more important thing is that ultrasonic method is very difficult to the detection of the manufacturability defective of polyethylene pipe joint, especially the detection at the cold welding defective also lacks effective means at present.
The utility model content
The purpose of this utility model is the deficiency that overcomes the above-mentioned background technology, and a kind of microwave detecting device of polyethylene pipe welding joint is provided.This pick-up unit has can detect polytype defective, detection sensitivity and advantages such as precision height, good reliability, characterization processes defective effectively particularly, and easy and simple to handle, cost is lower.
The technical solution of the utility model is:
A kind of microwave transmission pick-up unit of polyethylene pipe welding joint, this pick-up unit comprises: microwave probe, microwave antenna, signal translating system, single-chip microcomputer or computing machine, microwave probe is in a side of the welding joint outside surface of polyethylene pipe, be in the opposite side of welding joint with the microwave antenna of microwave probe mechanical connection, the center of microwave antenna is relative with the center of microwave probe, and the output terminal of microwave antenna connects single-chip microcomputer or computing machine by cable through signal translating system.
The microwave transmission pick-up unit of described polyethylene pipe welding joint is provided with microwave emitter in the microwave probe, be provided with microwave remote sensor in the microwave antenna, and the center of microwave emitter and microwave remote sensor is relatively arranged on the both sides of welding joint.
The microwave transmission pick-up unit of described polyethylene pipe welding joint, signal translating system is made up of position transducer, signal amplifier and digital-to-analog signal converter, 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 single-chip microcomputer or computing machine.
The microwave transmission pick-up unit of described polyethylene pipe welding joint, the distance control between microwave probe and the welding joint outside surface is at 0-10cm.
The microwave transmission pick-up unit of described polyethylene pipe welding joint, welding joint are electric fusion joint or hot melting connector.
Principle of the present utility model is as follows:
Microwave is the electromagnetic wave of a kind of frequency range between 0.3-300GHz, 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 changes the parameter of microwave.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 changed the phase place of microwave, amplitude etc.The microwave penetration welding joint that changes, receive and convert to electric signal by the microwave antenna that is positioned at the pipeline opposite side, in input single-chip microcomputer or computing machine behind the transmitted wave signal process signal translating system, obtain the microwave oscillogram, can obtain the relevant information of welding joint defective according to oscillogram.
Compared with prior art, advantage of the present utility model:
The pick-up unit that the utility model provides can detect various types of defectives of polyethylene pipe welding joint effectively reliably, and concrete advantage is as follows:
(1) compares with lossless detection methods such as ultrasonic, the rays of routine, the microwave transmission pick-up unit of the utility model polyethylene pipe welding joint defective does not need the physics contact between microwave probe and the tested joint when detecting, do not need couplant yet, can realize the not fast detecting of surface in contact, be applicable to on-the-spot the detection, the detection efficiency height is conducive to shorten detection time, reduces and detects cost;
(2) the utility model microwave detecting device comprises: comprise the microwave probe of microwave emitter, the microwave antenna that comprises microwave remote sensor, signal translating system, single-chip microcomputer or computing machine and stube cable, it is easy and simple to handle, and cost is lower;
(3) microwave probe of the present utility model and microwave antenna can be made up of solid-state devices, and be not only light but also firm, is not easy to damage;
(4) the utility model can detect various volume type defectives and the area-type defective in the welding joint effectively, especially can detect effectively such as the such manufacturability defective of cold welding defective, and this is that other lossless detection method is difficult to realize;
(5) microwave transmission detection technique of the present utility model is mainly used in the detection to dielectric material, as plastics, rubber, pottery, fiberglass etc.At home, have not yet to see the report that relevant microwave transmission technology detects the polyethylene pipe welding joint, therefore enforcement of the present utility model is expected to fill up the domestic blank in this field;
(6) the utility model pick-up unit can be used for on-the-spot the detection.
Description of drawings
Fig. 1 is the work synoptic diagram of the microwave detecting device that provides of the utility model.
Fig. 2 is the detection principle schematic of the microwave transmission pick-up unit that provides of the utility model.
Fig. 3 is the waveform synoptic diagram of transmitted wave and transmitted wave in the microwave transmission pick-up unit testing process that provides of the utility model embodiment 1.
Fig. 4 is the waveform synoptic diagram of transmitted wave and transmitted wave in the microwave transmission pick-up unit testing process that provides of the utility model embodiment 3.
Fig. 5 is the waveform synoptic diagram of transmitted wave and transmitted wave in the microwave transmission pick-up unit testing process that provides of the utility model embodiment 4.
Fig. 6 is the waveform synoptic diagram of transmitted wave and transmitted wave in the microwave transmission pick-up unit testing process that provides of the utility model embodiment 5.
Among the figure, 1 polyethylene pipe; 2 welding joints; 3 microwave probes; 4 microwave antennas; 5 signal translating systems; 6 single-chip microcomputers or computing machine; 7 microwave emitters; 8 defectives; 9 microwave remote sensors.
Embodiment
Below in conjunction with the drawings and specific embodiments, further set forth the utility model.
Shown in Fig. 1-2, the microwave transmission pick-up unit of the welding joint 2 of the utility model polyethylene pipe 1 comprises: microwave probe 3, microwave antenna 4, signal translating system 5, single-chip microcomputer or computing machine 6 etc., and concrete structure is as follows:
In the utility model, microwave probe 3 is in the slow mobile defective scanning of carrying out of a side of welding joint 2 outside surfaces of polyethylene pipe 1, translational speed is 1-20cm/s, the microwave antenna 4 that is attached thereto is mobile thereupon at the opposite side of welding joint 2, passes the transmitted wave signal of welding joint 2 with reception.
In the utility model, signal translating system 5 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 single-chip microcomputer or computing machine 6.
In the utility model, the data (value of position coordinates x and y) that provide according to position transducer and the data of microwave direct of travel (coordinate z) can be determined the particular location of defective.Wherein, microwave is through phase place after the defective change (initial phase shift), change and from fault location the phase place relevant with its propagation distance (wave-path) also can take place during be received on the basis of initial phase shift, therefore the value that the microwave phase information that obtains according to microwave antenna can coordinates computed z.
As shown in Figure 2, be provided with microwave emitter 7 in the microwave probe 3, be provided with microwave remote sensor 9 in the microwave antenna 4, the center of microwave emitter 7 and microwave remote sensor 9 is relatively arranged on the both sides of welding joint 2.When detecting the polyethylene pipe welding joint with microwave detecting device, microwave emitter 7 in the microwave probe 3 is to welding joint 2 launched microwaves, the microwave penetration joint surface enters its inside, defective in the material can be regarded as the medium that has with the material around differing dielectric constant, when the microwave in advancing ran into defective 8, the variation of specific inductive capacity changed parameters such as microwave amplitude, phase place; The microwave that sees through welding joint receives and converts to electric signal by the microwave remote sensor 9 in the microwave antenna 4, in input single-chip microcomputer or computing machine behind the transmitted wave signal process signal translating system, obtain the microwave oscillogram, can obtain the relevant information of polyethylene pipe welding joint defective according to analysis waveform figure.
Shown in Fig. 1-2, the microwave transmission detection method of the utility model polyethylene pipe welding joint, realize according to the following steps:
(1) microwave probe 3 is placed a side of polyethylene pipe welding joint 2 outside surfaces, it is that 1-100GHz(is preferably 5-50GHz that the microwave emitter 7 in the microwave probe 3 adopts transmission frequencies) microwave scan detection;
(2) be in the opposite side of welding joint 2 with the microwave antenna 4 of microwave probe 3 mechanical connections, the center of microwave antenna 4 is relative with the center of microwave probe 3, receives the microwave signal that sees through welding joint 2 by the microwave remote sensor 9 in the microwave antenna 4;
(3) after signal the process amplification and D/A switch of signal translating system 5 that microwave antenna 4 obtains, handled by single-chip microcomputer or computing machine, form waveform image, can analyze defective.
The microwave detecting device that uses the utility model to provide detects a flawless polyethylene pipe hot melt joint.Elder generation's butt junction outside surface carries out simple process, make it smooth smooth, step butt junction in the technical scheme that provides according to the utility model detects then, microwave probe is placed a side of this hot melting connector outside surface, distance between microwave probe and the hot melting connector outside surface is 2cm, slowly mobile microwave is popped one's head in, translational speed is 2cm/s, transmission frequency is that the microwave of 12.5GHz scans, the center of the microwave antenna that links to each other with microwave probe is relative with the center of microwave probe, mobile with microwave probe, receive the microwave signal that sees through hot melting connector.The microwave oscillogram that present embodiment obtains as shown in Figure 3, horizontal ordinate represents microwave phase (unit: radian) among the figure, ordinate represents the microwave amplitude, and (amplitude units can be various ways, therefore used a.u.(can use multiple unit in the oscillogram) represent), pass the transmitted wave of joint and compare almost not variation with transmitted wave.
The microwave detecting device that uses the utility model to provide detects a flawless polyethylene pipe electric fusion joint.Elder generation's butt junction outside surface carries out simple process, make it smooth smooth, step in the technical scheme that provides according to the utility model detects electric fusion joint then, microwave probe is placed a side of this electric fusion joint outside surface, distance between microwave probe and the electric fusion joint outside surface is 1cm, slowly mobile microwave is popped one's head in, translational speed is 1.5cm/s, transmission frequency is that the microwave of 12.5GHz scans, the center of the microwave antenna that links to each other with microwave probe is relative with the center of microwave probe, mobile with microwave probe, receive the microwave signal that sees through electric fusion joint.The microwave oscillogram that present embodiment obtains is similar to the oscillogram among the embodiment 1, passes the transmitted wave of electric fusion joint and compares almost not variation with transmitted wave.
The microwave detecting device that uses the utility model to provide detects a polyethylene pipe hot melt joint that contains crack defect.Earlier the hot melting connector outside surface is carried out simple process, make it smooth smooth, step in the technical scheme that provides according to the utility model detects hot melting connector then, microwave probe is placed a side of this hot melting connector outside surface, distance between microwave probe and the hot melting connector outside surface is 2cm, slowly mobile microwave is popped one's head in, translational speed is 3cm/s, transmission frequency is that the microwave of 12GHz scans, the center of the microwave antenna that links to each other with microwave probe is relative with the center of microwave probe, mobile with microwave probe, receive the microwave signal that sees through hot melting connector.The microwave oscillogram that present embodiment obtains as shown in Figure 4, horizontal ordinate represents microwave phase (unit: radian) among the figure, ordinate represents microwave amplitude (amplitude units can be various ways, so has used a.u.(can use multiple unit in the oscillogram) and represents).Pass the transmitted wave of hot melting connector and compare with transmitted wave, wave amplitude obviously reduces, and is 47% of transmitted wave, and variation has taken place phase place, has produced the phase shift of 0.165 π.
The microwave detecting device that uses the utility model to provide detects a polyethylene pipe hot melt joint that contains the cold welding defective.Earlier the hot melting connector outside surface is carried out simple process, make it smooth smooth, step in the technical scheme that provides according to the utility model detects hot melting connector then, microwave probe is placed a side of this hot melting connector outside surface, distance between microwave probe and the hot melting connector outside surface is 2cm, slowly mobile microwave is popped one's head in, translational speed is 1.5cm/s, transmission frequency is that the microwave of 12.5GHz scans, the center of the microwave antenna that links to each other with microwave probe is relative with the center of microwave probe, mobile with microwave probe, receive the microwave signal that sees through hot melting connector.The microwave oscillogram that present embodiment obtains as shown in Figure 5, horizontal ordinate represents microwave phase (unit: radian) among the figure, ordinate represents microwave amplitude (amplitude units can be various ways, so has used a.u.(can use multiple unit in the oscillogram) and represents).Pass the transmitted wave of hot melting connector and compare with transmitted wave, wave amplitude reduces, and is 68% of transmitted wave, and variation has taken place phase place, has produced the phase shift of 0.154 π.
The microwave detecting device that uses the utility model to provide detects a polyethylene pipe electric fusion joint that contains the cold welding defective.Earlier the electric fusion joint outside surface is carried out simple process, make it smooth smooth, step in the technical scheme that provides according to the utility model detects electric fusion joint then, microwave probe is placed a side of this electric fusion joint outside surface, distance between microwave probe and the electric fusion joint outside surface is 1cm, slowly mobile microwave is popped one's head in, translational speed is 1cm/s, transmission frequency is that the microwave of 12.5GHz scans, the center of the microwave antenna that links to each other with microwave probe is relative with the center of microwave probe, mobile with microwave probe, receive the microwave signal that sees through electric fusion joint.The microwave oscillogram that present embodiment obtains as shown in Figure 6, the X coordinate represents microwave phase among the figure, the Y coordinate represents the microwave amplitude.Pass the transmitted wave of electric fusion joint and compare with transmitted wave, wave amplitude reduces, and is 74% of transmitted wave, and variation has taken place phase place, has produced the phase shift of 0.15 π.
Embodiment result shows, can detect polytype defective based on the detection method of this pick-up unit, has detection sensitivity and advantages such as precision height, good reliability, characterization processes defective effectively, and can be used for on-the-spot the detection.Detect the polyethylene pipe welding joint with microwave detecting device, microwave probe is to tested welding joint launched microwave, and the microwave penetration joint surface enters its inside, and parameters such as phase place, amplitude change through defective the time; The microwave that sees through joint receives and converts to electric signal by the microwave antenna that is positioned at the pipeline opposite side, in input single-chip microcomputer or computing machine behind the transmitted wave signal process signal translating system, obtain the microwave oscillogram, can obtain the relevant information of welding joint defective according to oscillogram.
Should be understood that these embodiment only are used for explanation the utility model, and be not used in restriction scope of the present utility model.Should be understood that in addition those skilled in the art make various changes or modifications the utility model, these equivalent form of values fall within limited range of the present utility model equally.
Claims (5)
1. the microwave transmission pick-up unit of a polyethylene pipe welding joint, it is characterized in that, this pick-up unit comprises: microwave probe, microwave antenna, signal translating system, single-chip microcomputer or computing machine, microwave probe is in a side of the welding joint outside surface of polyethylene pipe, be in the opposite side of welding joint with the microwave antenna of microwave probe mechanical connection, the center of microwave antenna is relative with the center of microwave probe, and the output terminal of microwave antenna connects single-chip microcomputer or computing machine by cable through signal translating system.
2. according to the microwave transmission pick-up unit of the described polyethylene pipe welding joint of claim 1, it is characterized in that, be provided with microwave emitter in the microwave probe, be provided with microwave remote sensor in the microwave antenna, the center of microwave emitter and microwave remote sensor is relatively arranged on the both sides of welding joint.
3. according to the microwave transmission pick-up unit of the described polyethylene pipe welding joint of claim 1, it is characterized in that, signal translating system is made up of position transducer, signal amplifier and digital-to-analog signal converter, 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 single-chip microcomputer or computing machine.
4. according to the microwave transmission pick-up unit of the described polyethylene pipe welding joint of claim 1, it is characterized in that the distance control between microwave probe and the welding joint outside surface is at 0-10cm.
5. according to the microwave transmission pick-up unit of the described polyethylene pipe welding joint of claim 1, it is characterized in that welding joint is electric fusion joint or hot melting connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320070119 CN203164137U (en) | 2013-02-06 | 2013-02-06 | Microwave transmission detection device of polyethylene pipeline welding joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320070119 CN203164137U (en) | 2013-02-06 | 2013-02-06 | Microwave transmission detection device of polyethylene pipeline welding joint |
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| CN203164137U true CN203164137U (en) | 2013-08-28 |
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| CN 201320070119 Expired - Fee Related CN203164137U (en) | 2013-02-06 | 2013-02-06 | Microwave transmission detection device of polyethylene pipeline welding joint |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115930A (en) * | 2013-02-06 | 2013-05-22 | 嘉兴市特种设备检测院 | Microwave transmission detection method and device for welding joint of polyethylene pipeline |
| RU2626307C1 (en) * | 2016-06-21 | 2017-07-25 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Method for controlling pipe welds |
| CN108375590A (en) * | 2018-01-19 | 2018-08-07 | 西安交通大学 | The online lossless detection method of universal joint surface casting flaw |
| CN109100428A (en) * | 2018-09-18 | 2018-12-28 | 广东核电合营有限公司 | A kind of preparation method of 3 grades of HDPE pipeline A hole defects of nuclear safety |
-
2013
- 2013-02-06 CN CN 201320070119 patent/CN203164137U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115930A (en) * | 2013-02-06 | 2013-05-22 | 嘉兴市特种设备检测院 | Microwave transmission detection method and device for welding joint of polyethylene pipeline |
| RU2626307C1 (en) * | 2016-06-21 | 2017-07-25 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Method for controlling pipe welds |
| CN108375590A (en) * | 2018-01-19 | 2018-08-07 | 西安交通大学 | The online lossless detection method of universal joint surface casting flaw |
| CN109100428A (en) * | 2018-09-18 | 2018-12-28 | 广东核电合营有限公司 | A kind of preparation method of 3 grades of HDPE pipeline A hole defects of nuclear safety |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20200206 |