CN110146591A - A transient electromagnetic pipeline defect scanning device with magnetic field focusing - Google Patents

Abstract

The invention discloses a transient electromagnetic pipeline defect scanning device with magnetic field focusing, which includes several probes, transient electromagnetic equipment and a data processing terminal. The probe includes an input end and an output end. The input end of the probe, the output end of the probe and the data processing terminal are connected; wherein, several probes are connected in series or in parallel, and the probes connected in series or in parallel are arranged in a circle, and the bottom of the probe is connected to the pipeline The contact part is a curved surface; this device can realize the purpose of quickly scanning the internal defects of the active pipeline and efficiently locating the abnormal location of corrosion.

Description

A transient electromagnetic pipeline defect scanning device with magnetic field focusing

technical field

The invention relates to the technical field of fault detection of chemical gathering and transportation pipelines, in particular to a transient electromagnetic pipeline defect scanning device with magnetic field focusing.

Background technique

During the operation of basic chemical and petroleum refining and chemical equipment, it is very necessary to monitor the wall thickness reduction of key high-corrosion risk pipelines. Generally, traditional ultrasonic thickness gauges are used for fixed-point thickness measurement.

The traditional fixed-point thickness measurement system relies on relevant risk standards and expert experience to select points, which cannot adapt to the complex and changeable environment on site, often resulting in missed inspections or failure to detect the most serious defect areas, resulting in many disadvantages. The fixed-point thickness measurement of the ultrasonic thickness gauge solves the problem of accurate remaining wall thickness data (assessment of remaining emphasis), but it cannot solve the accuracy of the detection location. The existing transient electromagnetic method can realize the pulsed eddy current scanning of a certain wall thickness, and realize the purpose of fast positioning of the defect position. However, it is difficult to achieve rapid penetration of pipes with thicker cladding and thicker walls. It is necessary to reduce the frequency to realize the location of defects, which cannot meet the problem of rapid location of defects by pulsed eddy currents.

In view of the technical problems existing in the existing technology, there is an urgent need for an application of the focusing function to realize the purpose of quickly scanning and locating defects on pipes with thicker cladding layers and larger pipe wall thicknesses, so as to solve the problem of large wall thickness. The scanning speed is slow and the accuracy is not high.

Contents of the invention

In view of this, the purpose of the present invention is to provide a transient electromagnetic pipeline defect scanning device with magnetic field focusing, including several probes, transient electromagnetic equipment and data processing terminals, the probes include input ends and output ends, the The transient electromagnetic equipment is respectively connected to the input end of the probe, the output end of the probe and the data processing terminal; wherein, several probes are connected in series or in parallel, and the probes connected in series or in parallel are arranged in a circle, and the The contact part between the bottom of the probe and the pipeline is an arc surface.

When the probes are connected in series, the output end of one of the probes is connected to the input end of the other probe, and the output end of the other probe is connected to the transient electromagnetic device to form a ring emission.

When the probes are connected in parallel, several probes share an output end and an input end to connect with the transient electromagnetic equipment, and emit excitation pulse eddy current at the same time.

Several probes can transmit and receive signals independently and be connected with the transient electromagnetic equipment.

The probes include transmitting probes and receiving probes, wherein there are several transmitting probes, and the receiving probes are respectively connected with several transmitting probes and transient electromagnetic equipment.

The transmitting probes are evenly distributed around the receiving probes.

The transmitting probes are centered on the receiving probes and have a uniform length of 40mm-500mm.

The number of probes is 2-6.

The contact portion between the bottom of the probe and the pipeline is an arc surface with a diameter of 30-600mm.

The probe is connected to the transient electromagnetic equipment by a cable.

Compared with the prior art, the beneficial effect of the present invention is that the probes form different focusing modes through two forms of series connection and parallel connection, so as to realize rapid scanning and positioning of pipes with thicker cladding layer and larger pipe wall thickness The purpose of the defect, so as to solve the problems of slow scanning speed and low accuracy of large wall thickness; when the probe is connected in parallel, it can detect the pipe with relatively high wall thickness; in series, it can detect the wall thickness of the pipe with relatively small wall thickness, The detection range is 2-30mm, and the working speed in series is fast, which can meet the purpose of fast scanning; at the same time, in order to facilitate the close connection of the probe with the pipe or the outer coating of the pipe, the probes connected in series or in parallel are Arranged in a circle, and the contact part between the bottom of the probe and the pipeline is an arc surface.

Description of drawings

Fig. 1 shows the structure of the transient electromagnetic pipeline defect scanning device of the present invention;

Fig. 2 shows the structural representation of probe and connecting base of the present invention;

Fig. 3 shows the schematic diagram of the probe series structure of the present invention;

Fig. 4 shows the schematic diagram of the probe parallel structure of the present invention;

FIG. 5 is a schematic diagram of the installation structure of the transmitting probe and the receiving probe of the present invention.

In the drawings: 1 is a probe, 2 is a transient electromagnetic device, 3 is a data processing terminal, 4 is a connecting seat, 11 is a transmitting probe, and 12 is a receiving probe.

Detailed ways

The present invention will be described in further detail below in conjunction with specific examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 1-5, a transient electromagnetic pipeline defect scanning device with magnetic field focusing includes several probes 1, transient electromagnetic equipment 2 and a data processing terminal 3, the probe 1 includes an input end and an output end, The transient electromagnetic equipment 2 is respectively connected to the input end of the probe, the output end of the probe and the data processing terminal 3; wherein, several probes are connected in series or in parallel, and the probes connected in series or in parallel are arranged in a circle , and the contact portion between the bottom of the probe 1 and the pipeline is an arc-shaped surface. The probes are connected in series and in parallel to form different focusing methods, so as to realize the purpose of quickly scanning and locating defects on pipes with thicker cladding layers and thicker pipe walls, thus solving the problem of slower scanning speed for larger wall thicknesses. Slow, low accuracy and other problems; when the probes are connected in parallel, they can detect pipes with relatively high wall thickness values, 2-50mm, but the speed is relatively slow compared to series work; series can detect pipe wall thicknesses with relatively small wall thickness values, The detection range is 2-30mm, and the working speed in series is fast, which can meet the purpose of fast scanning; at the same time, in order to facilitate the close connection of the probe with the pipe or the outer coating of the pipe, the probes connected in series or in parallel are Arranged in a circle, and the bottom of the probe 1 and the contact part of the pipe are arc-shaped. In this embodiment, the probe 1 is installed on the connecting seat 4, and the contact part between the connecting seat 4 and the pipe is also arc-shaped noodle.

During the working process, the probe cooperates with the transient electromagnetic equipment to achieve the purpose of quickly scanning the internal defects of the active pipeline and efficiently locating the abnormal location of corrosion; the probe 1 first receives the electromagnetic pulse signal emitted by the transient electromagnetic equipment 2, and then passes through the probe The emission reaction to the pipe or the cladding outside the pipe, for the defective part, the probe will generate a voltage signal, the voltage signal is sent to the transient electromagnetic device 2, and the transient electromagnetic device 2 receives the voltage signal and transmits the voltage signal It is generated to the data processing terminal to analyze and obtain the wall thickness value, and then complete the defect scanning.

In the above embodiment, the strength of the probe magnetic field is adjusted according to the change of the voltage, and the voltage adjustment range is 2v to 24V. When the voltage increases, a larger inductance will be generated in the coil of the probe, and the inductance is measured The key parameter of the magnetic field, so the larger the inductance, the stronger the magnetic field capability, and the larger the pipe wall thickness that can be detected. During use, adjust the voltage according to the wall thickness value to increase the detection ability of the probe.

When the probes 1 are connected in series, the output end of one of the probes is connected to the input end of the other probe, and the output end of the other probe is connected to the transient electromagnetic device 2 to form a ring emission; the voltage signal fed back by the probe is then Reception by means of transient electromagnetic equipment 2 .

When the probes are connected in parallel, several probes share an output port and an input port to connect with the transient electromagnetic device 2 , and emit excitation pulse eddy current at the same time, and the voltage signal fed back by the probes is received by the transient electromagnetic device 2 .

When the above-mentioned probes transmit in series or in parallel, several probes 1 can transmit and receive signals independently and be connected to the transient electromagnetic device 2 .

When the above-mentioned probes are connected in series or in parallel, the probe 1 includes a transmitting probe 11 and a receiving probe 12, wherein there are several transmitting probes 11, and the receiving probes 12 are connected with several transmitting probes 11 and transient electromagnetic probes respectively. The device 2 is connected, wherein, the transmitting probes 11 are evenly distributed around the receiving probe 12;

In the above embodiment, the number of probes is 2-6, and different focusing effects can be achieved by changing probes with different numbers, structures, and positions, so as to adapt to different pipe wall thickness values and satisfy Inspection of pipe diameter and wall thickness 2-50mm.

The contact part between the bottom of the probe 1 and the pipeline is an arc surface with a diameter of 30-600mm, so that the probe 1 can be tightly connected with the pipeline or the cladding layer outside the pipeline.

At the same time, in order to ensure the stability of the transmission, the probe 1 and the transient electromagnetic device 2 are connected by cables.

During work, because it needs to be excited by pulse voltage and current, the probe 1 will expand when it is working. In order to avoid the phenomenon of wear and tear between the probes 1 due to expansion, the probe 1 is filled with soft glue (see attached picture) not shown in ), the soft glue can simultaneously play the role of fixing and cushioning, protecting the service life of each probe and device.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (10)

1. A transient electromagnetic pipeline defect scanning device with magnetic field focusing, characterized in that it includes several probes (1), transient electromagnetic equipment (2) and data processing terminal (3), and the probe (1) includes The input terminal and the output terminal, the transient electromagnetic equipment (2) are respectively connected with the input terminal of the probe, the output terminal of the probe and the data processing terminal (3); wherein, several probes are connected in series or in parallel, and in series The probes connected or connected in parallel are arranged in a circle, and the contact part between the bottom of the probe (1) and the pipeline is an arc surface. 2. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 1, characterized in that: when the probes (1) are connected in series, the output end of one of the probes is connected to the input end of the other probe, The output end of the other probe is connected with the transient electromagnetic device (2) to form a ring emission. 3. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 1, characterized in that: when the probes (1) are connected in parallel, several probes share one output terminal and input terminal with the transient electromagnetic The device (2) is connected and at the same time emits the excitation pulse vortex. 4. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to any one of claims 1-3, characterized in that several probes (1) can transmit and receive signals independently and communicate with the transient The electromagnetic device (2) is connected. 5. The magnetic field-focused transient electromagnetic pipeline defect scanning device according to any one of claims 1-3, characterized in that: the probe (1) includes a transmitting probe (11) and a receiving probe (12), wherein , the transmitting probes (11) are provided with several, and the receiving probes (12) are respectively connected with several transmitting probes (11) and the transient electromagnetic equipment (2). 6 . The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 5 , characterized in that: the transmitting probes ( 11 ) are evenly distributed around the receiving probe ( 12 ) as the center. 7. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 6, characterized in that: the transmitting probes (11) are uniformly distributed with a length of 40mm-500mm centered on the receiving probe (12). 8. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 1, characterized in that the number of probes is 2-6. 9. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 1, characterized in that: the contact part between the bottom of the probe (1) and the pipeline is an arc surface with a diameter of 30-600mm. 10. The transient electromagnetic pipeline defect scanning device with magnetic field focusing according to claim 1, characterized in that: the probe (1) and the transient electromagnetic equipment (2) are connected by cables.