CN116299721A - PCCP broken wire multichannel electromagnetic detection system and method - Google Patents
PCCP broken wire multichannel electromagnetic detection system and method Download PDFInfo
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Abstract
The invention provides a PCCP broken wire multichannel electromagnetic detection system and a method, wherein the system comprises the following steps: the industrial control computer is used for installing detection software and controlling the whole detection process; the transmitter is used for generating an alternating current signal and driving the excitation probe to generate a primary field electromagnetic signal; the excitation probe is used for generating a primary field electromagnetic signal; the detection probe group is used for responding to the primary field electromagnetic signals, passing through the pipe wall of the PCCP pipe and the secondary field electromagnetic signals induced by the prestressed steel wire and generating voltage signals; the multichannel receiver is used for carrying out digital processing on the received voltage signals and generating digital signals; and the quadrature incremental encoder is used for generating quadrature pulse signals and obtaining displacement data according to pulse signal counting. The invention carries out multi-channel electromagnetic detection on the PCCP pipeline through the transceiver probe array with one transmitter and multiple receivers, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipeline.
Description
Technical Field
The invention relates to the technical field of PCCP pipeline wire breakage electromagnetic detection, in particular to a PCCP wire breakage multichannel electromagnetic detection system and method.
Background
PCCP, namely "prestressed concrete cylinder pipe", is widely used at home and abroad because of its characteristics of large caliber, high strength, high pressure resistance, high sealing property, excellent reliability, durability, shock resistance, low running management cost, etc. PCCP pipes have a certain safety risk. A large number of operation practices at home and abroad show that the PCCP engineering operation safety has obvious characteristics: over time, due to the influences of mortar protection layer defects, soil infiltration corrosion, steel wire hydrogen embrittlement, internal high pressure or overload factors, the prestressed steel wire can be broken in the operation process, so that the strength of the pipeline is reduced, and the pipeline pipe explosion accident can be caused.
In the existing PCCP wire breakage electromagnetic detection technology, a PCCP wire breakage single-channel electromagnetic detection technology is generally adopted, the wire breakage detection accuracy is low due to the influence of inherent random system noise, and the single-channel technology can only detect the number and axial positioning of PCCP wire breakage.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of low accuracy of single-channel detection of PCCP broken wires in the prior art, so as to provide a PCCP broken wire multi-channel electromagnetic detection system and method, which can carry out multi-channel electromagnetic detection on PCCP pipes through a multi-receiving transceiver probe array, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipes.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the present invention provides a PCCP wire break multichannel electromagnetic detection system, the system comprising: the system comprises an industrial control computer, a transmitter, an excitation probe, a detection probe group, a multichannel receiver and an orthogonal incremental encoder;
the industrial control computer is used for installing detection software, sending control instructions to the transmitter, receiving orthogonal pulse signals of the orthogonal incremental encoder, calculating displacement data, receiving digital signals of the multichannel receiver, identifying and storing the digital signals, analyzing and calculating according to the digital signals, and judging the number, axial positioning and circumferential positioning of PCCP broken wires;
the transmitter comprises a signal generator and a driver, wherein the signal generator is used for generating an alternating current signal according to the first control instruction, and the driver is used for driving the excitation probe to generate a primary field electromagnetic signal based on the alternating current signal;
the detection probe group is used for responding to the primary field electromagnetic signals, generating voltage signals based on the secondary field electromagnetic signals and transmitting the voltage signals to the multichannel receiver through the pipe wall of the PCCP pipe and the secondary field electromagnetic signals induced by the prestressed steel wire;
the multichannel receiver digitizes the received voltage signal and generates a digital signal.
The PCCP wire breakage multichannel electromagnetic detection system provided by the embodiment of the invention controls the whole detection process through an industrial control computer, comprises the steps of receiving displacement data of an orthogonal pulse signal calculation system of an orthogonal incremental encoder, controlling a transmitter to generate an alternating current signal and generating a primary field electromagnetic signal through an excitation probe in the system moving process, responding a secondary field electromagnetic signal induced by the primary field electromagnetic signal through the pipe wall of a PCCP pipe and a prestressed steel wire and generating a voltage signal by a detection probe group, receiving a digital signal obtained after the digital processing of the voltage signal by a multichannel receiver by the industrial control computer, and judging the number, axial positioning and circumferential positioning of PCCP wires according to the digital signal. The invention carries out multi-channel electromagnetic detection on the PCCP pipeline through the transceiver probe array with one transmitter and multiple receivers, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipeline.
Optionally, the detection probe set includes: and the detection probes are parallel to the axis direction of the detected pipeline, are uniformly arranged along the circumferential direction of the PCCP pipeline, and are arranged in a space perpendicular to the excitation probes.
The invention carries out multi-channel electromagnetic detection on PCCP pipelines by constructing a transceiver probe array with one transmitter and multiple receivers, and comprises an excitation probe and a plurality of groups of detection probes. Wherein the excitation probes are arranged vertically in space with the detection probes, so that direct coupling interference of the excitation probes can be reduced. In addition, each detection probe is arranged in parallel to the axis direction of the detected pipeline, so that more pipe wall eddy magnetic flux can be received, and the detection sensitivity is improved; the PCCP detection probes are uniformly arranged along the circumferential direction of the PCCP pipeline, so that the relative positions of the detection probes and the broken wire are different, different voltage signals are induced, analysis and calculation are carried out according to the difference of the voltage signals, and the circumferential positioning of the PCCP broken wire is realized.
In a second aspect, an embodiment of the present invention provides a PCCP wire breakage multichannel electromagnetic detection method, including the steps of:
s1: the PCCP wire-breaking multichannel electromagnetic detection system acquires displacement data through an orthogonal incremental encoder in the moving process, and an excitation probe generates a primary field electromagnetic signal according to an alternating current signal transmitted by a transmitter;
s2: the detection probe group responds to the primary field electromagnetic signals, and generates voltage signals through secondary field electromagnetic signals induced by the pipe wall of the PCCP pipe and the prestressed steel wire;
s3: the multichannel receiver generates a digital signal by performing digital processing on the received voltage signal and sends the digital signal to an industrial control computer;
s4: the industrial control computer stores the received digital signals into a buffer zone, identifies the digital signals, repeats S1-S3 if the preset digital characteristics at the PCCP pipeline interface are not identified, and stores the digital signals in the buffer zone into a local memory if the preset digital characteristics are identified;
s5: and repeating S1-S4 according to the displacement data until the detection of all pipe joints of the PCCP pipeline is completed, and judging the number of PCCP broken wires, axial positioning and circumferential positioning according to the detection result.
According to the PCCP wire breakage multichannel electromagnetic detection method provided by the embodiment of the invention, the primary field electromagnetic signal is generated by the excitation probe according to the alternating current signal of the transmitter, the detection probe group responds to the secondary field electromagnetic signal induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipe and the prestressed steel wire and generates a voltage signal, the multichannel receiver receives the voltage signal and carries out digital processing, and then the obtained digital signal is sent to the industrial control computer, the industrial control computer carries out identification and storage on the digital signal, realizes detection on all pipe joints through the orthogonal incremental encoder, and judges the number, axial positioning and circumferential positioning of PCCP wire breakage according to the detection result. The invention carries out multi-channel electromagnetic detection on the PCCP pipeline through the transceiver probe array with one transmitter and multiple receivers, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipeline.
Optionally, the detection system performs broken wire multi-channel electromagnetic detection by moving in a PCCP pipe.
The detection system provided by the invention is used for detecting broken wires at different positions by moving along the PCCP pipeline, a primary field electromagnetic signal is continuously generated by the excitation probe in the moving process, and the detection probe responds to a secondary field electromagnetic signal induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipeline and the prestressed steel wire and generates a voltage signal, wherein the voltage signal at each position contains broken wire information of the whole PCCP pipeline.
Optionally, the process of acquiring displacement data includes: the PCCP wire breakage multichannel electromagnetic detection system drives the orthogonal incremental encoder to rotate and outputs two paths of orthogonal pulse signals in the moving process; and acquiring displacement data of the system by counting the orthogonal pulse signals.
According to the invention, the orthogonal incremental encoder is arranged on the movable roller of the detection system, the detection system moves forwards through the rolling of the roller, and the roller rolls to drive the orthogonal incremental encoder to rotate, so that two paths of orthogonal pulse signals are output. The pulse signals correspond to the rolling of the roller, the rolling circle number of the roller can be obtained by counting the pulse signals, so that displacement data of the detection system are obtained, and the broken wire detection of the whole PCCP pipeline can be realized according to the movement of the displacement data control system.
Optionally, the process of the detection probe set responding to the primary field electromagnetic signal and generating a voltage signal through the secondary field electromagnetic signal induced by the pipe wall of the PCCP pipe and the prestressed wire comprises the following steps: the exciting coil of the exciting probe, the receiving coil of the detecting probe and the circumferential prestress steel wire form a multistage electromagnetic coupling system; the primary field electromagnetic signal generated by the excitation probe penetrates through the pipe wall of the PCCP pipe and acts on the prestressed wire after axially propagating along the pipe outside the pipe to generate a secondary field electromagnetic signal; the secondary field electromagnetic signal penetrates again the wall of the PCCP pipe and is coupled to the detection probe, thereby generating a voltage signal.
The invention adopts the far-field eddy current electromagnetic detection principle to monitor PCCP wire breakage, and an exciting coil of an exciting probe, a receiving coil of a detection probe and a circumferential prestress steel wire form a multistage electromagnetic coupling system, wherein the prestress steel wire is a secondary coil of the exciting coil and a primary coil of the receiving coil. The exciting coil generates an alternating exciting magnetic field as a primary field, the primary field penetrates through the PCCP steel cylinder to act on the prestressed steel wire to generate a mutual inductance alternating voltage/current so as to form a secondary field, and the secondary field is coupled to the receiving coil. When the prestressed steel wire is broken or severely rusted, the intensity and the phase of the secondary field are distorted, and the distorted signal is coupled to the receiving coil, so that the broken wire detection is realized.
Optionally, the preset digital features are stored in the industrial control computer in advance, and the identification result is determined by comparing the digital signals of the buffer area with the preset digital features.
The invention stores the digital characteristic representing the PCCP pipeline interface into the industrial control computer in advance, the industrial control computer stores the digital signal into the buffer area after receiving the digital signal and compares the digital signal with the digital characteristic, if the comparison result is consistent, the preset digital characteristic is identified, the detection system completes the detection of the current PCCP pipe section at the moment, all the digital signals of the current pipe section are uniformly stored into the local memory, and the detection of the next pipe section is restarted. The broken wire detection of the PCCP pipeline is distinguished according to pipe sections, the general position of broken wires can be firstly determined according to different pipe sections, and the detection rate is improved.
Optionally, the implementation process of the circumferential positioning includes: if the PCCP pipeline is broken, the intensity and the phase of the secondary field electromagnetic signal which is induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipeline and the prestressed steel wire are distorted; based on different relative positions of the detection probes and the broken wire, the voltage signals generated by the detection probe group based on the secondary field electromagnetic signals are different; and carrying out circumferential positioning on the PCCP broken wire according to the difference.
According to the invention, PCCP wire breakage is circularly positioned through the transmitting and receiving probe array with one transmitter and multiple receivers, and each probe of the detection probe group is sequentially arranged at intervals along the circumferential direction of the pipeline, when the PCCP wire breakage phenomenon occurs, the induced voltage signals have differences due to different relative positions of the detection probes and the wire breakage occurrence positions, and through the differences, the circumferential positioning of the PCCP wire breakage can be realized, and the axial positioning precision can be improved.
Optionally, the number, axial positioning and circumferential positioning of the PCCP filaments are set to be determined during PCCP pipe inspection or after PCCP pipe inspection is completed.
The invention can judge the wire breakage position and the number in the detection process of the PCCP pipeline, and can judge the wire breakage position and the number after the detection of all pipe joints is finished, so that the invention can be suitable for different application scenes.
Optionally, the multichannel receiver improves the signal-to-noise ratio of each channel through low noise amplification and dual-phase correlation reception, and extracts a voltage signal with the same frequency as the alternating current signal transmitted by the transmitter.
In the detection process, the primary field electromagnetic signal induces the secondary field electromagnetic signal through the pipe wall of the PCCP pipe and the prestressed wire, the secondary field electromagnetic signal penetrates through the pipe wall of the PCCP pipe again to reach the detection probe group, and the voltage signal generated under the induction of the far-field eddy current signal penetrating through the pipe wall twice is extremely weak, so that the signal-to-noise ratio of each channel is improved through low-noise amplification and biphase correlation reception by the multichannel receiver, the voltage signal with the same frequency as the alternating current signal emitted by the transmitter is extracted, the influence of inherent random noise of the system on a single channel is effectively overcome, and the accuracy of PCCP wire breakage detection is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a PCCP yarn-breaking multichannel electromagnetic detection system provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of a carrying platform of a PCCP wire-breaking multichannel electromagnetic detection system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a transceiver probe array of a PCCP wire-breaking multichannel electromagnetic detection system according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a PCCP yarn-breaking multichannel electromagnetic detection method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a far-field eddy current electromagnetic detection method of a PCCP yarn-breaking multichannel electromagnetic detection method according to an embodiment of the present invention.
Reference numerals:
1-a leading cabin; 2-an equipment compartment; 3-exciting the probe; 4-detecting probe group; a 5-quadrature incremental encoder; 6-supporting arms; 7-PCCP pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The embodiment of the invention provides a PCCP wire breakage multichannel electromagnetic detection system, as shown in figure 1, which comprises: the system comprises an industrial control computer, a transmitter, an excitation probe, a detection probe group, a multichannel receiver and an orthogonal incremental encoder;
the industrial control computer is used for installing detection software, sending control instructions to the transmitter, receiving orthogonal pulse signals of the orthogonal incremental encoder, calculating displacement data, receiving digital signals of the multichannel receiver, identifying and storing the digital signals, analyzing and calculating according to the digital signals, and judging the number, axial positioning and circumferential positioning of PCCP broken wires;
the transmitter comprises a signal generator and a driver, wherein the signal generator is used for generating an alternating current signal according to the first control instruction, and the driver is used for driving the excitation probe to generate a primary field electromagnetic signal based on the alternating current signal;
the detection probe group is used for responding to the primary field electromagnetic signals, generating voltage signals based on the secondary field electromagnetic signals and transmitting the voltage signals to the multichannel receiver through the pipe wall of the PCCP pipe and the secondary field electromagnetic signals induced by the prestressed steel wire;
the multichannel receiver digitizes the received voltage signal and generates a digital signal.
Specifically, in the embodiment of the present invention, as shown in fig. 2, which is a carrying platform of the detection system, the detection probe set of the present invention includes 4 detection probes, but is not limited thereto. The carrying platform is supported by nine supporting arms 6 with rolling wheels, the nine supporting arms are respectively arranged around a front cabin 1 and an equipment cabin 2 of the carrying platform, an industrial control computer, a transmitter and a multichannel receiver are all arranged in the equipment cabin 2 of the carrying platform, an orthogonal incremental encoder 5 is arranged on the shaft of the rolling wheel of any one of the two supporting arms at the upper part of the front cabin 1 of the carrying platform, 4 detection probes of an excitation probe 3 and a detection probe group 4 are respectively arranged on the supporting arms 6 around the equipment cabin 2 of the carrying platform, and all the probes are parallel to the axis direction of a detected pipeline and are uniformly arranged along the circumferential direction of the PCCP pipeline and are vertically arranged in space with the excitation probes to form a transceiver probe array with one end and four ends, as shown in figure 3.
In addition, the excitation probe is used as a sensor, the alternating current signal output by the low-frequency power amplifier is converted into magnetic field energy and is emitted, and an eddy current signal is induced on the PCCP pipe wall. However, far-field eddy current signals are very weak, millivolt level and even microvolts level, and are difficult to extract, so that the invention adopts a single loop coil form as an excitation coil of the excitation probe, but the invention is not limited to the single loop coil form. In addition, the excitation probe is provided with the shielding disc, so that the effect of direct coupling energy of the excitation probe and the detection probe group can be attenuated, and the direct coupling interference during detection can be reduced. The receiving coil of the detection probe also adopts a single loop coil form to submit the receiving sensitivity.
The PCCP wire breakage multichannel electromagnetic detection system provided by the embodiment of the invention controls the whole detection process through an industrial control computer, comprises the steps of receiving displacement data of an orthogonal pulse signal calculation system of an orthogonal incremental encoder, controlling a transmitter to generate an alternating current signal and generating a primary field electromagnetic signal through an excitation probe in the system moving process, responding a secondary field electromagnetic signal induced by the primary field electromagnetic signal through the pipe wall of a PCCP pipe and a prestressed steel wire and generating a voltage signal by a detection probe group, receiving a digital signal obtained after the digital processing of the voltage signal by a multichannel receiver by the industrial control computer, and judging the number, axial positioning and circumferential positioning of PCCP wires according to the digital signal. The invention carries out multi-channel electromagnetic detection on the PCCP pipeline through the transceiver probe array with one transmitter and multiple receivers, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipeline.
Example 2
The embodiment of the invention provides a PCCP wire breakage multichannel electromagnetic detection method, as shown in fig. 4, which is based on the system provided in the embodiment 1 for PCCP wire breakage detection, and comprises the following steps:
step S1, the PCCP wire-breaking multichannel electromagnetic detection system acquires displacement data through an orthogonal incremental encoder in the moving process, and an excitation probe generates a primary field electromagnetic signal according to an alternating current signal transmitted by a transmitter.
Specifically, in the embodiment of the present invention, as shown in fig. 2, the carrying platform of the detection system may travel in the PCCP pipe 7 under the control of manual pushing or electric traction, and the roller of the support arm drives the rotation shaft of the orthogonal incremental encoder to rotate when rolling along the pipe wall during the traveling process, so as to output two paths of orthogonal pulse signals. The pulse signals correspond to the rolling of the roller, and the rolling circle number of the roller can be obtained by counting the two paths of pulse signals, so that the displacement data of the carrying platform are obtained.
In the embodiment of the invention, in the moving process of the carrying platform, the industrial control computer sends a control instruction to the transmitter to control the signal generator of the transmitter to output an alternating current signal with certain frequency and power. Wherein, to meet the conditions of far-field eddy current detection, the ac signal must meet two conditions: firstly, enough penetrating power and secondly, enough power are needed. The penetrating power of the alternating current signal is mainly determined by frequency, and the power depends on later amplification, so the invention adopts a low-frequency sinusoidal signal, and the power amplification is carried out on the sinusoidal wave signal through a low-frequency power amplifier after the alternating current signal is generated. The driver of the transmitter receives the AC signal after power amplification and then drives the excitation probe to continuously generate a low-frequency AC electromagnetic field, namely a primary field electromagnetic signal.
Step S2: and the detection probe group responds to the primary field electromagnetic signals, passes through the secondary field electromagnetic signals induced by the pipe wall of the PCCP pipe and the prestressed steel wire, and generates voltage signals.
Specifically, in the embodiment of the invention, an exciting coil of an exciting probe, a receiving coil of a detecting probe and a circumferential prestress steel wire form a multistage electromagnetic coupling system, and a far-field eddy current electromagnetic detection principle is applied to perform wire breakage detection, and the principle is shown in fig. 5. The primary field electromagnetic signal generated by the excitation probe penetrates through the pipe wall of the PCCP pipe and acts on the prestressed steel wire after the primary field electromagnetic signal propagates along the pipe axial direction outside the pipe to generate a secondary field electromagnetic signal, the secondary field electromagnetic signal penetrates through the pipe wall of the PCCP pipe again and is coupled to the detection probe group, and the detection probe group induces a voltage signal.
Step S3: the multichannel receiver generates a digital signal by performing digital processing on the received voltage signal, and transmits the digital signal to an industrial control computer.
Specifically, in the embodiment of the invention, after receiving the voltage signal of the detection probe set, the multichannel receiver improves the signal-to-noise ratio of each channel through low-noise amplification and biphase correlation reception, and extracts a weak voltage signal with the same frequency as the reference signal through parameter adjustment by taking the alternating current signal transmitted by the transmitter as the reference signal. The voltage signal is digitized to obtain a digital signal, and the digital signal is sent to an industrial control computer.
Step S4: and the industrial control computer stores the received digital signals into a buffer zone, identifies the digital signals, repeats S1-S3 if the preset digital characteristics at the PCCP pipeline interface are not identified, and stores the digital signals in the buffer zone into a local memory if the preset digital characteristics are identified.
Specifically, in the embodiment of the invention, the detection process is distinguished according to different pipe sections of the PCCP pipe, and the interfaces of the different pipe sections of the PCCP pipe are represented by preset digital characteristics. The industrial control computer receives the digital signals and stores the digital signals into the buffer, the digital signals are compared with preset digital features stored in the industrial control computer in advance, if the comparison is successful, the preset digital features are identified, the detection system finishes the detection of the current PCCP pipe section, all the digital signals of the current pipe section are uniformly stored into the local memory, and the detection of the next pipe section is restarted. If the comparison is unsuccessful, the carrying platform continues to move forwards, and the obtained digital signal record is stored in the buffer memory until the digital characteristics are identified.
Step S5: and repeating S1-S4 according to the displacement data until the detection of all pipe joints of the PCCP pipeline is completed, and judging the number of PCCP broken wires, axial positioning and circumferential positioning according to the detection result.
Specifically, in the embodiment of the invention, current displacement data of the carrying platform is obtained according to the orthogonal incremental encoder, and whether detection of all pipe joints of the PCCP pipeline is completed is judged according to the displacement data. According to the method and the device, the number, the axial positioning and the circumferential positioning of the PCCP broken wires are judged according to the detection result, and in the embodiment of the invention, the broken wire positions and the number can be judged in the detection process of the PCCP pipeline, and the judgment can be carried out after all pipe sections are detected.
In the embodiment of the invention, if the PCCP pipeline breaks, the intensity and the phase of the secondary field electromagnetic signal which is induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipeline and the prestressed steel wire are distorted. Because the relative positions of the detection probes and the broken wire occur are different, the voltage signals generated by the detection probe group based on the secondary field electromagnetic signals are different, and a position-intensity curve, a position-phase curve and an angle-intensity curve are generated according to the detection result, so that the number, the longitudinal positioning and the circumferential positioning of the broken wire can be obtained through quantitative analysis of the curves.
According to the PCCP wire breakage multichannel electromagnetic detection method provided by the embodiment of the invention, the primary field electromagnetic signal is generated by the excitation probe according to the alternating current signal of the transmitter, the detection probe group responds to the secondary field electromagnetic signal induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipe and the prestressed steel wire and generates a voltage signal, the multichannel receiver receives the voltage signal and carries out digital processing, and then the obtained digital signal is sent to the industrial control computer, the industrial control computer carries out identification and storage on the digital signal, realizes detection on all pipe joints through the orthogonal incremental encoder, and judges the number, axial positioning and circumferential positioning of PCCP wire breakage according to the detection result. The invention carries out multi-channel electromagnetic detection on the PCCP pipeline through the transceiver probe array with one transmitter and multiple receivers, has the functions of PCCP broken wire quantity detection and axial and circumferential positioning, and can improve the broken wire detection accuracy of the PCCP pipeline.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (10)
1. A PCCP wire break multichannel electromagnetic detection system, comprising: the system comprises an industrial control computer, a transmitter, an excitation probe, a detection probe group, a multichannel receiver and an orthogonal incremental encoder;
the industrial control computer is used for installing detection software, receiving the orthogonal pulse signals of the orthogonal incremental encoder, calculating displacement data, sending control instructions to the transmitter, receiving digital signals of the multichannel receiver, identifying and storing the digital signals, and judging the number, axial positioning and circumferential positioning of PCCP broken wires according to the digital signals;
the transmitter comprises a signal generator and a driver, wherein the signal generator is used for generating an alternating current signal according to the control instruction, and the driver is used for driving the excitation probe to generate a primary field electromagnetic signal based on the alternating current signal;
the detection probe group is used for responding to the primary field electromagnetic signals, generating voltage signals based on the secondary field electromagnetic signals and transmitting the voltage signals to the multichannel receiver through the pipe wall of the PCCP pipe and the secondary field electromagnetic signals induced by the prestressed steel wire;
the multichannel receiver digitizes the received voltage signal and generates a digital signal.
2. The PCCP yarn break multichannel electromagnetic detection system of claim 1, wherein the detection probe set comprises: and the detection probes are parallel to the axis direction of the detected pipeline, are uniformly arranged along the circumferential direction of the PCCP pipeline, and are arranged in a space perpendicular to the excitation probes.
3. A PCCP yarn breakage multi-channel electromagnetic detection method, characterized in that yarn breakage detection is performed based on the PCCP yarn breakage multi-channel electromagnetic detection system according to claims 1-2, the detection method comprising:
s1: the PCCP wire-breaking multichannel electromagnetic detection system acquires displacement data through an orthogonal incremental encoder in the moving process, and an excitation probe generates a primary field electromagnetic signal according to an alternating current signal transmitted by a transmitter;
s2: the detection probe group responds to the primary field electromagnetic signals, and generates voltage signals through secondary field electromagnetic signals induced by the pipe wall of the PCCP pipe and the prestressed steel wire;
s3: the multichannel receiver generates a digital signal by performing digital processing on the received voltage signal and sends the digital signal to an industrial control computer;
s4: the industrial control computer stores the received digital signals into a buffer zone, identifies the digital signals, repeats S1-S3 if the preset digital characteristics at the PCCP pipeline interface are not identified, and stores the digital signals in the buffer zone into a local memory if the preset digital characteristics are identified;
s5: and repeating S1-S4 according to the displacement data until the detection of all pipe joints of the PCCP pipeline is completed, and judging the number of PCCP broken wires, axial positioning and circumferential positioning according to the detection result.
4. The PCCP wire-break multichannel electromagnetic detection method of claim 3, wherein the detection system performs wire-break multichannel electromagnetic detection by moving in a PCCP pipe.
5. The PCCP yarn breakage multi-channel electromagnetic testing method according to claim 3, wherein the process of acquiring displacement data includes:
the PCCP wire breakage multichannel electromagnetic detection system drives the orthogonal incremental encoder to rotate and outputs two paths of orthogonal pulse signals in the moving process;
and acquiring displacement data of the system by counting the orthogonal pulse signals.
6. The PCCP yarn break multichannel electromagnetic testing method of claim 3, wherein the process of the testing probe set responding to the primary field electromagnetic signal and generating a voltage signal through the secondary field electromagnetic signal induced by the wall of the PCCP pipe and the prestressed wire comprises:
the exciting coil of the exciting probe, the receiving coil of the detecting probe and the circumferential prestress steel wire form a multistage electromagnetic coupling system;
the primary field electromagnetic signal generated by the excitation probe penetrates through the pipe wall of the PCCP pipe and acts on the prestressed wire after axially propagating along the pipe outside the pipe to generate a secondary field electromagnetic signal;
the secondary field electromagnetic signal penetrates again through the wall of the PCCP pipe and is coupled to the detection probe set, thereby generating a voltage signal.
7. The PCCP yarn breakage multi-channel electromagnetic detection method according to claim 3, wherein the preset digital characteristic is stored in the industrial control computer in advance, and the recognition result is determined by comparing the digital signal of the buffer area with the preset digital characteristic.
8. The PCCP yarn breakage multichannel electromagnetic detection method according to claim 3, wherein the implementation process of the circumferential positioning includes:
if the PCCP pipeline is broken, the intensity and the phase of the secondary field electromagnetic signal which is induced by the primary field electromagnetic signal through the pipe wall of the PCCP pipeline and the prestressed steel wire are distorted;
based on different relative positions of the detection probes and the broken wire, the voltage signals generated by the detection probe group based on the secondary field electromagnetic signals are different;
and carrying out circumferential positioning on the PCCP broken wire by adopting a software algorithm according to the difference.
9. The PCCP yarn break multichannel electromagnetic detection method according to claim 3, wherein the number, axial positioning and circumferential positioning of the PCCP yarn breaks are set to be determined during PCCP pipe detection or after PCCP pipe detection is completed.
10. The PCCP yarn break multi-channel electromagnetic detection method of claim 3, wherein the multi-channel receiver increases signal-to-noise ratio of each channel through low noise amplification and dual-phase correlation reception, and extracts a voltage signal of the same frequency as the ac signal transmitted by the transmitter.
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