CN212364181U - On-line monitoring and detecting system for medium and low frequency electromagnetic eddy current - Google Patents
On-line monitoring and detecting system for medium and low frequency electromagnetic eddy current Download PDFInfo
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- CN212364181U CN212364181U CN202020727985.9U CN202020727985U CN212364181U CN 212364181 U CN212364181 U CN 212364181U CN 202020727985 U CN202020727985 U CN 202020727985U CN 212364181 U CN212364181 U CN 212364181U
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Abstract
The utility model discloses a middle and low frequency electromagnetic eddy current on-line monitoring and detecting system, which comprises a middle and low frequency electromagnetic eddy current monitoring and detecting probe, a middle and low frequency electromagnetic eddy current host and a terminal processing system; the medium-low frequency electromagnetic eddy current monitoring and detecting probe comprises a plurality of patch type sensors which are arranged on the flexible winding belt; the flexible winding belt is arranged on the outer wall of the pipeline to be tested; the patch type sensor is connected with the concentrator through an integrated wiring harness consisting of a plurality of wires, and the concentrator is provided with an adjustable quick connector for connecting a medium-low frequency electromagnetic eddy current host; the medium-low frequency electromagnetic eddy current host is also connected with a terminal processing system; the detection probe of the system can be fixedly arranged at a position which is difficult to contact or seriously corroded in a pipeline or equipment, is connected to a junction box which is easy to contact through a cable, and can regularly monitor the corrosion trend of the position which is seriously corroded through a medium-low frequency electromagnetic host system and a terminal processing system; the detection method is simple in implementation mode, stable, reliable and good in practicability.
Description
Technical Field
The utility model belongs to basic chemical industry and petroleum refining industry industrial pipeline nondestructive test field are fit for the online prison detection of the internal corrosion defect of labour industrial pipeline (area is pressed, high temperature), concretely relates to pulse vortex online prison detecting system.
Background
Pipelines, pressure vessels and the like are widely applied to the fields of petroleum, chemical industry, electric power, energy and the like, and the pipelines and the pressure vessels are often in high-temperature, high-pressure and corrosive environments, are easy to corrode to form defects, cause sudden damage accidents and cause serious economic loss and environmental damage. Therefore, the method is a necessary means for avoiding the accidents by periodically detecting the corrosion and wear conditions of the pipeline and the equipment, monitoring the wall thickness reduction condition of the pipeline and the equipment with high corrosion risk on line and evaluating the applicability of the residual service life of the pipeline and the container.
The traditional wall thickness detection method for the pipeline and the equipment generally adopts a traditional ultrasonic thickness gauge to perform fixed-point thickness measurement, and as the ultrasonic thickness gauge can only perform fixed-point thickness measurement, continuous scanning cannot be realized, missing detection or the area with the most serious defects cannot be detected easily, and the defects are more. In addition, due to the requirements of heat preservation and moisture protection, partial pipelines and equipment are often covered with heat preservation layers and protective layers, and as a contact detection method, although the ultrasonic thickness measurement has high detection precision, in the detection process, heat preservation materials need to be detached, the outer surface needs to be polished, a coupling agent needs to be coated, the external heat preservation layers and the external protective layers need to be applied again after the detection is finished, the integrity of the original heat preservation layers is damaged in the process, and more serious corrosion under the heat preservation layers can be caused.
The pulse eddy current detection technology is a nondestructive detection technology for non-contact large-area detection developed in recent years, has high detection precision and high speed, can penetrate through a heat-insulating layer and a protective layer to detect the wall thickness of a pipeline or equipment, avoids the problems caused by traditional ultrasonic thickness measurement, and is a good nondestructive detection method. However, some ducts are located in locations that are not readily accessible to personnel and equipment, such as: the corrosion detection device comprises an elbow, a high-altitude pipeline, an outboard pipeline and the like, wherein the positions are often the positions where corrosion is important, the positions with serious corrosion need to be detected regularly, and the detection period is short. Therefore, there is a need for a device and technique that can monitor these hard-to-touch and severely corroded locations.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve foretell technical problem, and provide a well low frequency electromagnetic eddy current supervises detecting system on line.
The utility model discloses a realize according to following technical scheme:
a middle and low frequency electromagnetic eddy current on-line monitoring and detecting system comprises a middle and low frequency electromagnetic eddy current monitoring and detecting probe for acquiring excitation signals and pipeline defect data; the medium and low frequency electromagnetic eddy current host system is used for generating signals, receiving signals and preprocessing the received signals; the terminal processing system is used for processing signals, calculating wall thickness and displaying results; the medium and low frequency electromagnetic eddy current monitoring and detecting probe comprises a plurality of patch type sensors which are arranged on the flexible winding belt; the flexible winding belt is arranged on the outer wall of the pipeline to be tested; the patch type sensor is connected with the concentrator through an integrated wiring harness consisting of a plurality of wires, and the concentrator is provided with an adjustable quick connector for connecting a medium-low frequency electromagnetic eddy current host; the medium-low frequency electromagnetic eddy current host is also connected with a terminal processing system.
The number of the patch type sensors is not less than three; the patch type sensors on the same flexible winding belt are arranged at equal intervals.
The terminal processing system is a common computer or a tablet computer system comprising a data processing module and a display module, and is connected with the medium-low frequency electromagnetic eddy current host system through Bluetooth or a cable.
The medium and low frequency electromagnetic eddy current host is connected with the concentrator through a cable and consists of a signal generating module, a signal receiving module and a signal preprocessing module.
The patch type sensor consists of a coil framework, an exciting coil, a receiving coil, a Hall element, a magnetic core and a shielding case; the coil framework is in a cylindrical hollow shape, the exciting coil and the receiving coil are coaxial and wound on the framework, the magnetic core is placed in the hollow position of the framework, the shielding case is a shell of the whole patch type sensor, and the exciting coil and the receiving coil are in contact with two wires and are connected to the integrated wiring harness.
The utility model has the advantages and beneficial effects that:
the utility model discloses it is high, fast to detect the precision, can pierce through the wall thickness that heat preservation and protective layer detected pipeline or equipment, has avoided the problem that traditional ultrasonic thickness measurement brought, is good nondestructive test method. And can monitor and detect the position which is difficult to contact and seriously corroded on the pipeline. The implementation mode is simple, stable and reliable, and has good practicability.
Drawings
Fig. 1 is a schematic structural view of the on-line monitoring system for low-and-medium frequency electromagnetic eddy current of the present invention.
Fig. 2 is the installation schematic diagram of the monitoring device of the present invention.
Wherein, 1, a pipeline to be tested; 2. a heat-insulating layer; 3. a patch type sensor; 4. flexible tape winding; 5. integrating the wire harness; 6. and a hub.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1-2, an online monitoring and detecting system for medium and low frequency electromagnetic eddy current comprises a monitoring and detecting probe for medium and low frequency electromagnetic eddy current for collecting excitation signals and pipeline defect data; the medium and low frequency electromagnetic eddy current host system is used for generating signals, receiving signals and preprocessing the received signals; the terminal processing system is used for processing signals, calculating wall thickness and displaying results; the medium and low frequency electromagnetic eddy current monitoring and detecting probe comprises a plurality of patch type sensors 3 which are arranged on a flexible winding belt 4; the flexible winding belt 4 is arranged on the outer wall of the pipeline 1 to be tested; the patch type sensor 3 is connected with a concentrator 6 through an integrated wiring harness 5 consisting of a plurality of wires, and the concentrator 6 is provided with an adjustable quick connector for connecting a medium-low frequency electromagnetic eddy current host; the medium-low frequency electromagnetic eddy current host is also connected with a terminal processing system.
The number of the patch sensors 3 is not less than three; the patch type sensors 3 on the same flexible winding belt 4 are arranged at equal intervals.
The terminal processing system is a common computer or a tablet computer system comprising a data processing module and a display module, and is connected with the medium-low frequency electromagnetic eddy current host system through Bluetooth or a cable.
The medium and low frequency electromagnetic eddy current host is connected with the concentrator 6 through a cable and consists of a signal generating module, a signal receiving module and a signal preprocessing module.
The patch type sensor 3 consists of a coil framework, an exciting coil, a receiving coil, a Hall element, a magnetic core and a shielding case; the coil framework is in a cylindrical hollow shape, the exciting coil and the receiving coil are coaxial and wound on the framework, the magnetic core is placed in the hollow position of the framework, the shielding case is a shell of the whole patch type sensor 3, and the exciting coil and the receiving coil are in contact with two wires which are connected to the integrated wiring harness 5.
The detection method based on the system comprises the following steps:
s1: selecting a monitoring part on a pipeline, determining the material, the pipe diameter and the original wall thickness D0 of the position, selecting a proper flexible winding belt and a proper surface mount type sensor, and selecting the number of the sensors;
s2: equidistantly mounting the patch type sensors selected in the step S1 on the flexible winding belt selected in the step S1, and setting a serial number for each sensor;
s3: winding and fixedly installing the flexible winding tape in the step S2 at a monitoring part, and connecting the concentrator to a position which is easy to operate by personnel through a connecting cable to realize the installation of the monitoring device;
s4: connecting the medium-low frequency electromagnetic eddy current host machine with the monitoring device in the step S3 through a cable and an adjustable quick connector; connecting the data processing terminal with the medium and low frequency electromagnetic eddy current host through Bluetooth or a cable;
s5: according to the pipe diameter and the original wall thickness determined in the step S1, parameters for monitoring are set by the terminal processing system and the medium and low frequency electromagnetic eddy current host, including but not limited to: excitation signal frequency and duty ratio, excitation voltage and acquisition times; wherein the frequency of the excitation signal is selected between 1 HZ and 32HZ, the duty ratio is selected between 10 percent and 90 percent, the excitation voltage is selected between 2V and 20V, and the acquisition times are selected between 0 to 50.
S6: the data processing terminal sends a detection instruction, the medium and low frequency electromagnetic eddy current host generates a signal, the signal is transmitted to the corresponding patch type sensor through a cable, the sensor excites the signal and acquires the signal and then transmits the received signal to the host, the host preprocesses the data and records the serial number of the sensor, and the host sends the preprocessed signal and the serial number of the sensor to the data processing terminal; the operations in step S6 are sequentially performed on the patch sensor.
S7: the signal after being preprocessed by the host computer is represented as a data row which comprises response time T and a corresponding induction voltage value V, and each group of data rows comprises 20-31 (response time T, induction voltage V) values; using the data obtained by the first detection as a reference signal S1; and storing the data.
S8: the terminal processing system carries out batch processing on each group of data columns and calculates the wall thickness value of the corresponding sensor position; the wall thickness value obtained by the reference signal S1 is a reference wall thickness D1; comparing D1 with D0 to obtain the wall thickness reduction condition; and storing the data.
S9: and repeating the operation of the step S6-8 according to a preset period, and comparing the data to obtain the thinning trend of the wall thickness.
Fig. 1 is a schematic structural diagram of a medium-low frequency electromagnetic eddy current online monitoring system, which comprises: the medium and low frequency electromagnetic eddy current monitoring and detecting probe is used for acquiring excitation signals and pipeline defect data; the medium and low frequency electromagnetic eddy current host system is used for generating signals, receiving signals and preprocessing the received signals; the terminal processing system is used for processing signals, calculating wall thickness and displaying results; and associated cables, etc.
The monitoring device comprises a patch type sensor, a flexible winding belt, a connecting cable, a concentrator and the like, and the installation schematic diagram of the monitoring device is shown in figure 2.
The number of the patch type sensors is generally 3-9, and the sensors with proper number are selected according to the pipe diameter and the monitoring position. The single patch type sensor consists of a coil framework, an exciting coil, a receiving element, a magnetic core and a shielding case. The bobbin is typically a fluoroplastic-containing material, such as polyvinylidene fluoride (PVDF) or polyvinyl fluoride (PVF), and is machined or purchased for sensor size and shape, and is typically hollow cylindrical. The exciting coil is wound on the coil framework, the material of the exciting coil is an enameled wire with the wire diameter of 0.2-2mm, the winding number is 50-1500 turns, and the exciting coil plays a role in transmitting an exciting signal. The receiving element is a receiving coil or a Hall element, and when the receiving element is the receiving coil, the receiving element is also wound on the coil framework, the receiving element is made of an enameled wire with the wire diameter of 0.1-1mm, and the winding number is 50-1500 turns; when the receiving element is a Hall element, the receiving element is generally arranged at the center of the coil framework; the receiving element functions to receive the detection signal. The magnetic core is generally a ferrite cylindrical magnetic core, and is placed in the hollow part of the center of the coil framework to play a role in focusing a magnetic field. The shielding cover is a shielding structure with electromagnetic field shielding performance, and is arranged outside the coil and used for shielding signal interference among different sensors.
The flexible winding belt is used for installing the patch type sensor and is wound and fixed on the pipeline. And selecting the appropriate flexible winding belt and the number of sensors according to the pipe diameter. For the pipeline with heat insulation, the flexible winding belt can be installed under the heat insulation layer and can also be installed on the heat insulation layer.
The patch type sensor on the flexible winding belt is directly connected with the concentrator through a connecting cable, and the concentrator is provided with an adjustable quick connector for connecting the patch type sensor with the medium-low frequency electromagnetic eddy current host. The length of the connection cable and the position of the hub are adjustable, with the aim of locating the hub in an easy-to-operate position. The quick switching connector is arranged in the concentrator, and can quickly and sequentially switch and connect the patch type sensors on the flexible winding belt.
The medium-low frequency electromagnetic eddy current host consists of a signal generating module, a signal receiving module and a signal preprocessing module. The medium-low frequency electromagnetic eddy current host is connected with a hub in the monitoring device through a cable and a quick connector. The signal generation module generates signals after receiving a detection instruction, the signals are sent to a formulated sensor through the concentrator and the cable, the sensor exciting coil sends out exciting signals to a detection position, the receiving element receives the signals, the received signals are transmitted to the signal receiving module of the host through the cable and the concentrator, noise is removed through the signal preprocessing module, the signals are converted into a data column comprising response time T and corresponding induced voltage values V, and each data column comprises 20-31 (response time T, induced voltage V) values. The terminal processing system comprises a data processing module, a wall thickness calculating module and a result displaying module. The data processing module receives a detection signal and a sensor sequence signal which are preprocessed by the medium-low frequency electromagnetic eddy current host, performs logarithmic processing on the signals, and obtains a characteristic value; the characteristic value is calculated by a wall thickness calculating module to obtain the real-time wall thickness of the response position; and the result shows that the real-time wall thickness is compared with the original wall thickness and the early-stage monitored wall thickness to obtain the corrosion development trend, and the corrosion development trend is displayed in a curve form.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A middle and low frequency electromagnetic eddy current on-line monitoring and detecting system comprises a middle and low frequency electromagnetic eddy current monitoring and detecting probe for acquiring excitation signals and pipeline defect data; the medium and low frequency electromagnetic eddy current host system is used for generating signals, receiving signals and preprocessing the received signals; the terminal processing system is used for processing signals, calculating wall thickness and displaying results; the medium and low frequency electromagnetic eddy current monitoring and detecting probe is characterized by comprising a plurality of patch type sensors (3) arranged on a flexible winding belt (4); the flexible winding belt (4) is arranged on the outer wall of the pipeline (1) to be tested; the patch type sensor (3) is connected with a concentrator (6) through an integrated wiring harness (5) consisting of a plurality of wires, and the concentrator (6) is provided with an adjustable quick connector for connecting a medium-low frequency electromagnetic eddy current host; the medium-low frequency electromagnetic eddy current host is also connected with a terminal processing system.
2. The on-line monitoring and detecting system for the medium and low frequency electromagnetic eddy current as claimed in claim 1, wherein the number of the patch sensors (3) is not less than three; the patch type sensors (3) on the same flexible winding belt (4) are arranged at equal intervals.
3. The on-line monitoring and detecting system for medium and low frequency electromagnetic eddy current as claimed in claim 1, wherein the terminal processing system is a general computer or a tablet computer system comprising a data processing module and a display module, and the terminal processing system is connected with the medium and low frequency electromagnetic eddy current host computer through bluetooth or a cable.
4. The on-line monitoring and detecting system for the medium and low frequency electromagnetic eddy current as claimed in claim 1, wherein the medium and low frequency electromagnetic eddy current host is connected with the hub (6) through a cable, and the medium and low frequency electromagnetic eddy current host is composed of a signal generating module, a signal receiving module and a signal preprocessing module.
5. The on-line monitoring and detecting system for the medium and low frequency electromagnetic eddy current as claimed in claim 1, wherein the patch type sensor (3) is composed of a coil framework, an exciting coil, a receiving coil or a Hall element, a magnetic core and a shielding case; the coil framework is in a cylindrical hollow shape, the exciting coil and the receiving coil are coaxial and wound on the framework, the magnetic core is placed in the hollow position of the framework, the shielding case is a shell of the whole patch type sensor (3), and the exciting coil and the receiving coil are in contact with two wires and are connected to the integrated wiring harness (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595936A (en) * | 2020-05-07 | 2020-08-28 | 天津舜捷安科技有限公司 | Medium-low frequency electromagnetic eddy current online monitoring and detecting system and detecting method |
| CN115327007A (en) * | 2022-08-17 | 2022-11-11 | 浙江双石药业有限公司 | Method for detecting fingerprint spectrum of ephedra decoction |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595936A (en) * | 2020-05-07 | 2020-08-28 | 天津舜捷安科技有限公司 | Medium-low frequency electromagnetic eddy current online monitoring and detecting system and detecting method |
| CN115327007A (en) * | 2022-08-17 | 2022-11-11 | 浙江双石药业有限公司 | Method for detecting fingerprint spectrum of ephedra decoction |
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