Far-field eddy current device for detection in urban gas pipeline

Abstract

The utility model relates to a far-field eddy current device for detection in an urban gas pipeline. The far-field eddy current device for detecting the interior of the urban gas pipeline comprises the gas pipeline and an eddy current detection unit, wherein the eddy current detection unit comprises an internal assembly and an external assembly which are located on the inner side and the outer side of the gas pipeline; the internal assembly comprises a fixing ring, a plurality of inserting rods are inserted into the fixing ring, arc-shaped first magnets are arranged at the ends of the inserting rods, the inner arc faces of the first magnets are arranged inwards, cleaning pieces are arranged on the outer arc faces of the first magnets, and first reset springs are arranged between the inserting rods and the fixing ring. According to the utility model, the internal assembly can detect the gas pipeline, and can clean impurities attached to the inner wall of the gas pipeline. The internal component and the external component can change adaptively according to the change of the pipe diameter of the gas pipeline, so that the far-field vortex device for the internal detection of the urban gas pipeline can be suitable for the detection of gas pipelines with different pipe diameters.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline interiors, and in particular relates to a far-field eddy current device for detecting interiors of urban gas pipelines. Background Art

[0002] With the development of science and technology, far-field eddy current detection technology has been widely used in the field of pipeline detection. Existing far-field eddy current probes usually adopt a single receiving coil structure. The signal is sent out by the excitation coil and the eddy current signal is received in the far field by the receiving coil. According to the change of the eddy current signal, it can be analyzed and judged whether there are defects in the pipe wall. Because the eddy current signal itself is weak, the far-field eddy current probe with a single receiving coil is only suitable for detection in pipelines with small diameters. For gas pipelines with larger diameters, the receiving coil must also be increased. However, it is difficult for a larger receiving coil to receive weaker far-field eddy current signals. However, the existing pipeline eddy current device is very inconvenient to move in the pipeline. Therefore, it is necessary to provide an eddy current device that is easy to move. Utility Model Content

[0003] In order to achieve the above-mentioned purpose, the utility model provides a far-field eddy current device for detecting inside a city gas pipeline.

[0004] The technical solution of a remote field eddy current device for detecting in a city gas pipeline of the utility model is:

[0005] A remote field eddy current device for detecting in a city gas pipeline comprises a gas pipeline and an eddy current detection unit, wherein the eddy current detection unit comprises an internal component and an external component located at both sides of the gas pipeline;

[0006] The internal component comprises a fixed ring, an eddy current detection component is arranged on the fixed ring, a plurality of plug rods are inserted on the fixed ring, an arc-shaped first magnet is arranged at the end of the plug rod, the inner arc surface of the first magnet is arranged inward, a cleaning sheet is arranged on the outer arc surface of the first magnet, and a first reset spring is arranged between the plug rod and the fixed ring;

[0007] The external component includes a connecting ring, on which a plurality of connecting rods are inserted, an arc-shaped second magnet is provided at the end of the connecting rod, the inner arc surface of the second magnet is arranged inwardly, a second reset spring is provided between the connecting ring and the connecting rod, the first magnetic pole and the second magnetic pole of the first magnet are respectively located on the inner arc surface and the outer arc surface of the first magnet, and the first magnetic pole and the second magnetic pole of the second magnet are respectively located on the inner arc surface and the outer arc surface of the second magnet.

[0008] As a further improvement of the above technical solution, the connecting ring includes a plurality of isosceles trapezoidal blocks and a plurality of rectangular blocks. The isosceles trapezoidal blocks are arranged at intervals from the rectangular blocks. The upper bottom surfaces of the isosceles trapezoidal blocks are arranged inwardly. The two waist surfaces of the isosceles trapezoidal blocks are respectively pivotally connected to two adjacent rectangular blocks, and the connecting rod is arranged on the rectangular blocks.

[0009] As a further improvement to the above technical solution, the insertion rod is a rectangular rod, the inner end of the insertion rod is fixedly connected to a circular plate, one end of the first return spring is fixedly connected to the circular plate, and the other end is fixedly connected to the inner wall of the fixing ring.

[0010] As a further improvement of the above technical solution, a plurality of guide sleeves which are mounted one by one on the insertion rod are provided on the inner wall of the fixing ring, and the guide sleeves cooperate with the circular plate guide. A connecting tube with an opening at the top and a sealing at the bottom is provided inside the fixing ring, and the connecting tube is fixedly connected to the guide sleeves.

[0011] The utility model provides a remote field eddy current device for detecting in a city gas pipeline. Compared with the prior art, the utility model has the following beneficial effects:

[0012] When the utility model of the far-field eddy current device for detecting the inner wall of a city gas pipeline is used, the internal component is placed in the gas pipeline of the fluidized bed, and the external component drives the internal component to move up and down. The internal component can detect the gas pipeline and clean up the debris attached to the inner wall of the gas pipeline. Both the internal component and the external component can be adaptively changed according to the change of the diameter of the gas pipeline, so that the utility model of the far-field eddy current device for detecting the inner wall of the city gas pipeline can be applied to the detection of gas pipelines with different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a position relationship diagram of a gas pipeline and an eddy current detection unit in a far-field eddy current device for detection in a city gas pipeline according to an embodiment of the utility model;

[0014] Figure 2 It is a relationship diagram between a gas pipeline and an eddy current detection unit in a far-field eddy current device for detection in a city gas pipeline according to an embodiment of the utility model;

[0015] In the figure: 1 gas pipeline, 2 eddy current detection unit, 3 fixing ring, 4 plug rod, 5 first magnet, 6 cleaning sheet, 7 round plate, 8 first return spring, 9 connecting ring, 10 connecting rod, 11 second magnet, 12 retaining ring, 13 second return spring. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods:

[0017] The specific embodiment of the remote field eddy current device for detecting in a city gas pipeline of the utility model is as follows: Figure 1 , Figure 2 As shown, it includes a gas pipeline 1 and an eddy current detection unit 2. The gas pipeline 1 is a conical tube structure with a diameter gradually decreasing from top to bottom. The eddy current detection unit 2 includes internal components and external components.

[0018] The internal component includes a fixed ring 3, which is a circular ring. The outer wall of the fixed ring 3 is provided with a plurality of perforations evenly spaced along the circumference of the fixed ring 3. The perforations penetrate the inner and outer walls of the fixed ring 3 and extend radially along the fixed ring 3. A plug rod 4 is inserted in each perforation. Preferably, the perforations are rectangular holes, and the plug rod 4 is a rectangular rod matching the plug hole. This design helps to prevent the plug rod 4 from rotating in the perforation. A circular plate 7 is fixedly connected to one end of the plug rod 4 located inside the fixed ring 3, and a first reset spring 8 is mounted on the part of the plug rod 4 located inside the fixed ring 3. The two ends of the first reset spring 8 are respectively fixedly connected to the inner wall of the fixed ring 3 and the circular plate 7. A first magnet 5 is fixedly connected to one end of the plug rod 4 located outside the fixed ring 3. The first magnet 5 is in the shape of a circular arc. The inner arc surface of the first magnet 5 is arranged inward, and the first magnetic pole and the second magnetic pole of the first magnet 5 are respectively located on the inner arc surface and the outer arc surface of the first magnet 5. A cleaning sheet 6 is fixedly connected to the outer arc surface of each first magnet 5 , and the cleaning sheet 6 can clean off the carbon nanotube deposits attached to the inner wall of the fluidized bed gas pipeline 1 .

[0019] The external component includes a connecting ring 9, on which a plurality of through holes are evenly spaced along the circumference of the connecting ring 9, and the through holes extend radially along the connecting ring 9. A connecting rod 10 is installed in each through hole, and one end of the connecting rod 10 located inside the connecting ring 9 is fixedly connected to a second magnet 11, and the second magnet 11 is in an arc shape, and the inner arc surface of the second magnet 11 is arranged inward. The first magnetic pole and the second magnetic pole of the second magnet 11 are respectively located on the inner arc surface and the outer arc surface of the second magnet 11. A retaining ring 12 is provided on the connecting rod 10 located inside the connecting ring 9, and a second reset spring 13 is mounted on the connecting rod 10 located inside the connecting ring 9, and the two ends of the second reset spring 13 are respectively fixedly connected to the retaining ring 12 and the inner wall of the connecting ring 9.

[0020] When the utility model of the far-field eddy current device for detecting the inner wall of a city gas pipeline is used, the internal component is placed in the gas pipeline of the fluidized bed, and the external component drives the internal component to move up and down. The internal component can detect the gas pipeline and clean up the debris attached to the inner wall of the gas pipeline. Both the internal component and the external component can be adaptively changed according to the change of the diameter of the gas pipeline, so that the utility model of the far-field eddy current device for detecting the inner wall of the city gas pipeline can be applied to the detection of gas pipelines with different diameters.

[0021] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A remote field eddy current device for detecting in a city gas pipeline, characterized in that: It includes a gas pipeline and an eddy current detection unit, wherein the eddy current detection unit includes an internal component and an external component located at both sides of the gas pipeline; The internal component comprises a fixed ring, an eddy current detection component is arranged on the fixed ring, a plurality of plug rods are inserted on the fixed ring, an arc-shaped first magnet is arranged at the end of the plug rod, the inner arc surface of the first magnet is arranged inward, a cleaning sheet is arranged on the outer arc surface of the first magnet, and a first reset spring is arranged between the plug rod and the fixed ring; The external component includes a connecting ring, on which a plurality of connecting rods are inserted, an arc-shaped second magnet is provided at the end of the connecting rod, the inner arc surface of the second magnet is arranged inwardly, a second reset spring is provided between the connecting ring and the connecting rod, the first magnetic pole and the second magnetic pole of the first magnet are respectively located on the inner arc surface and the outer arc surface of the first magnet, and the first magnetic pole and the second magnetic pole of the second magnet are respectively located on the inner arc surface and the outer arc surface of the second magnet.

2. The remote field eddy current device for detecting in a city gas pipeline according to claim 1, characterized in that: The connecting ring includes a plurality of isosceles trapezoidal blocks and a plurality of rectangular blocks. The isosceles trapezoidal blocks are arranged at intervals from the rectangular blocks. The upper bottom surfaces of the isosceles trapezoidal blocks are arranged inwardly. The two waist surfaces of the isosceles trapezoidal blocks are respectively pivotally connected to two adjacent rectangular blocks. The connecting rod is arranged on the rectangular block.

3. The remote field eddy current device for detecting in a city gas pipeline according to claim 1, characterized in that: The insertion rod is a rectangular rod, the inner end of which is fixedly connected to a circular plate, one end of the first return spring is fixedly connected to the circular plate, and the other end is fixedly connected to the inner wall of the fixing ring.

4. The remote field eddy current device for detecting in a city gas pipeline according to claim 3 is characterized in that: The inner wall of the fixing ring is provided with a plurality of guide sleeves which are sleeved on the insertion rod one by one, and the guide sleeves cooperate with the circular plate guide. A connecting tube with an opening at the top and a sealing at the bottom is provided inside the fixing ring, and the connecting tube is fixedly connected with the guide sleeves.

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