Pipe body detection device for small connecting pipe

Abstract

The invention provides a pipe body detection device for a small connecting pipe, and relates to the technical field of pipe body detection, the pipe body detection device comprises two semi-annular magnet boxes, one ends of the two magnet boxes are hinged through a hinge part, the other ends of the two magnet boxes are provided with buckle parts, the buckle parts are used for connecting the two magnet boxes to form a complete circular ring structure, and the two magnet boxes are connected through the hinge part. The inner diameter of the annular structure is matched with the outer diameter of the pipe body; the plurality of magnetic sensitive Hall elements are arranged on the inner peripheries of the two magnet boxes, and when the two magnet boxes are connected through the buckle component to form a complete annular structure, the plurality of magnetic sensitive Hall elements are annularly and uniformly distributed on the inner periphery of the annular structure; the magnetic flux leakage detection instrument is electrically connected with the plurality of magnetic sensitive Hall elements; the problems that in the prior art, technical problems exist in detection of the small connecting pipe, and rapid and accurate detection and positioning of the corrosion defect of the small connecting pipe of the petrochemical device are difficult to achieve are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe body detection, and more specifically, relates to a pipe body detection device for a small pipe connection. Background Art

[0002] In petrochemical plants, holes are usually made directly on the equipment body or pipelines, and semi-pipe joints, branch pipe seats, and branch pipe structures of DN50 and below are connected by welding. They are collectively referred to as small pipes. They are mainly used to install instruments for measuring temperature, pressure, liquid level, and safety relief devices, etc., and are usually located on the inside of the first valve of the equipment or pipeline pipe. Most of the materials transported inside the equipment and pipelines of petrochemical plants are corrosive, and small pipes are usually located at the blind end of the medium flow due to their special structure, which makes it easier for corrosive media to accumulate. Therefore, they have become a weak link in the corrosion management of petrochemical plants. In addition, due to the large number of small pipes in petrochemical plants, corrosion and leakage often occur. Therefore, the corrosion problem of small pipes has become a great hidden danger to the safe production of the plant. Therefore, it is extremely important to carry out non-destructive testing technology research on small pipes and timely discover corrosion problems to reduce safety accidents and ensure the safe and stable operation of the plant.

[0003] Due to the special operation characteristics and installation location, the inspection of small pipes in petrochemical plants is still a difficult and technically weak link. Existing inspection methods mainly include ultrasonic thickness measurement, penetration testing, magnetic particle testing and radiographic testing, but they all have their limitations and shortcomings, as follows:

[0004] (1) Ultrasonic fixed-point thickness measurement requires grinding at the points, which is inefficient and easy to miss. At the same time, for small pipes, the probe cannot be tightly coupled with the pipe, affecting the detection accuracy;

[0005] (2) Penetrant and magnetic particle testing can only detect surface defects, but not buried defects. The surface of the pipe needs to be polished, which is inefficient. Moreover, the polishing process of the pipe of the running device poses a safety hazard.

[0006] (3) The X-ray detection method can only detect the pipes of the shutdown device. For small pipe corner welds, it is impossible to place detection instruments and photosensitive imaging components. Summary of the invention

[0007] The purpose of the present invention is to provide a pipe body detection device for small pipes in view of the shortcomings of the prior art, so as to solve the technical difficulties in the detection of small pipes in the prior art and the problem that it is difficult to quickly and accurately detect and locate corrosion defects of small pipes in petrochemical equipment.

[0008] In order to achieve the above object, the present invention provides a pipe body detection device for a small pipe connection, comprising:

[0009] Two semi-circular magnet boxes, one end of the two magnet boxes is hinged by a hinge component, and the other end of the two magnet boxes is provided with a buckle component, the buckle component is used to connect the two magnet boxes to form a complete circular ring structure, and the inner diameter of the circular ring structure matches the outer diameter of the tube body;

[0010] A plurality of magnetically sensitive Hall elements, wherein the plurality of magnetically sensitive Hall elements are arranged on the inner periphery of the two magnet boxes, and when the two magnet boxes are connected by the buckle component to form a complete annular structure, the plurality of magnetically sensitive Hall elements are evenly distributed in an annular pattern on the inner periphery of the annular structure;

[0011] A magnetic flux leakage detection instrument is electrically connected to the plurality of magnetically sensitive Hall elements.

[0012] Optionally, the outer diameter of the tube body is not greater than 50 mm, and the length of the tube body is not greater than 200 mm.

[0013] Optionally, the axial length of the magnet box is 50-100 mm.

[0014] Optionally, the material of the magnet box is a permanent magnet.

[0015] Optionally, ferromagnetic gaskets are embedded at both end poles of the magnet box.

[0016] Optionally, a groove is provided in the middle of the inner circumference of the magnet box, and the magnetically sensitive Hall element is embedded in the groove.

[0017] Optionally, when the two magnet boxes are connected by the snap-fit ​​component to form a complete annular structure, a plurality of the magnetically sensitive Hall elements are evenly distributed along a plurality of virtual circles on the inner circumference of the annular structure.

[0018] Optionally, at least one of the magnet boxes is provided with a threading hole, and the threading hole is used for the output wire of the magnetically sensitive Hall element.

[0019] Optionally, the outer side of the magnet box is covered with a shell, and the shell exposes the inner periphery and the magnetic poles at both ends of the magnet box.

[0020] Optionally, the shell is made of non-ferromagnetic material.

[0021] The invention provides a pipe body detection device for small pipes, and its beneficial effects are as follows: the pipe body detection device for small pipes utilizes the magnetic leakage principle of ferromagnetic materials. When the ferromagnetic pipe body is fully magnetized, if the pipe body has no defects, the magnetic lines of force will be evenly distributed in the pipe wall, and almost no overflow will occur. If the pipe has defects, the magnetic field at the defect will be distorted, and a part of the magnetic field will leak out of the pipe body surface to form a leakage magnetic field. The detected leakage magnetic field is converted into an electrical signal by a magnetic sensitive Hall element, and transmitted to a leakage magnetic detection instrument to realize the detection and positioning of pipe body defects. The pipe body detection device for small pipes can buckle two semicircular ring-shaped magnet boxes on the outside of the pipe body through a buckle component to form a sleeve state, and then magnetize the pipe body through the magnet box, and detect the leakage magnetic field situation by using the magnetic sensitive Hall element and transmit it to the leakage magnetic detection instrument to realize the detection and positioning of pipe body defects. The structure of the leakage magnetic detection probe is simplified and its size is reduced, so that it is more suitable for the detection of small pipes with small diameters, so that the defect detection of small pipes has higher flexibility, rapidity and accuracy.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0024] Figure 1 A schematic end view of a pipe body detection device for a small connecting pipe according to an embodiment of the present invention is shown.

[0025] Figure 2 A side schematic diagram of a pipe body detection device for a small connecting pipe according to an embodiment of the present invention is shown.

[0026] Figure 3 A schematic diagram of the internal structure of a pipe body detection device for a small connecting pipe according to an embodiment of the present invention is shown.

[0027] Description of reference numerals:

[0028] 1. Magnet box; 2. Articulated parts; 3. Buckle parts; 4. Tube body; 5. Magnetic sensitive Hall element; 6. Magnetic leakage detection instrument; 7. Ferromagnetic gasket; 8. Groove; 9. Threading hole; 10. Cable; 11. Casing. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] like Figures 1 to 3 As shown, the present invention provides a pipe body detection device for a small pipe, comprising:

[0031] Two semi-circular magnet boxes 1, one end of the two magnet boxes 1 is hinged by a hinge part 2, and the other end of the two magnet boxes 1 is provided with a buckle part 3, the buckle part 3 is used to connect the two magnet boxes 1 to form a complete circular ring structure, and the inner diameter of the circular ring structure matches the outer diameter of the tube body 4;

[0032] A plurality of magnetically sensitive Hall elements 5, wherein the plurality of magnetically sensitive Hall elements 5 are arranged on the inner periphery of the two magnet boxes 1, and when the two magnet boxes 1 are connected by the snap-fit ​​component 3 to form a complete annular structure, the plurality of magnetically sensitive Hall elements 5 are evenly distributed in an annular pattern on the inner periphery of the annular structure;

[0033] The magnetic flux leakage detection instrument 6 is electrically connected to the plurality of magnetically sensitive Hall elements 5 .

[0034] Specifically, in order to solve the problem that there are technical difficulties in the detection of small pipes in the prior art, it is difficult to quickly and accurately detect and locate the corrosion defects of small pipes in petrochemical equipment; the pipe body detection device for small pipes provided by the present invention uses the leakage magnetic principle of ferromagnetic materials. When the ferromagnetic pipe body 4 is fully magnetized, if the pipe body 4 has no defects, the magnetic lines of force will be evenly distributed in the pipe wall, and almost no overflow will occur. If there are defects in the pipe fittings, the magnetic field at the defect will be distorted, and a part of the magnetic field will leak out of the surface of the pipe body 4 to form a leakage magnetic field. The magnetic sensitive Hall element 5 is used to convert the detected leakage magnetic field into The electrical signal is transmitted to the leakage magnetic field detection instrument 6 to detect and locate the defects of the pipe body 4; the pipe body detection device for small pipes can buckle the two semicircular ring-shaped magnet boxes 1 on the outside of the pipe body 4 through the buckle component 3 to form a sleeve state, and then magnetize the pipe body 4 through the magnet box 1, and use the magnetic sensitive Hall element 5 to detect the leakage magnetic field and transmit it to the leakage magnetic field detection instrument 6 to detect and locate the defects of the pipe body 4; the structure of the leakage magnetic field detection probe is simplified and its size is reduced, which is more suitable for the detection of small pipes with small diameters, so that the defect detection of small pipes has higher flexibility, rapidity and accuracy.

[0035] Furthermore, the pipe body detection device for the small pipe adopts an openable and closable structure, which solves the problem that the detection device cannot be inserted because the outer end of the small pipe is usually equipped with valves, flanges, monitoring instruments and other components.

[0036] At the same time, the pipe body detection device for small pipes can be customized in various specifications according to the different diameters of the pipe body 4 to be tested, such as a detection device specifically for small pipes with diameters such as DN20, DN25, and DN50, to ensure that the pipe body 4 to be tested maintains a certain excitation strength, thereby improving the detection accuracy; the pipe body detection device for small pipes uses a ring-shaped structure magnet formed by two semicircular magnet boxes 1 to perform full-circular excitation magnetization on the small pipe to be tested, thereby improving the magnetization area and strength and ensuring the detection accuracy.

[0037] Optionally, the hinged component 2 can be a hinge, and the buckle component 3 can be selected as needed.

[0038] Specifically, the hinge can be a hinge type hinge, and two hinges are respectively connected to one end of the two magnet boxes 1; Figure 1 The buckle component 3 can adopt the structure of a buckle body and a buckle flange, and the buckle body and the buckle flange are respectively installed on the outside of the other end of the two magnet boxes 1. The buckle body is hooked on the buckle flange and the buckle body is pulled downward by the operating part to achieve the buckling of the two magnet boxes 1.

[0039] Furthermore, in order to ensure that the magnetic poles of the magnet box 1 and the magnetically sensitive Hall element 5 are in close contact with the tube body 4 to be measured, at least two snap-fit ​​components 3 are provided on the magnet box 1, and the two snap-fit ​​components 3 can be respectively provided at positions close to the two ends of the magnet box 1 in the axial direction.

[0040] Optionally, the outer diameter of the tube body 4 is not greater than 50 mm, and the length of the tube body 4 is not greater than 200 mm.

[0041] Specifically, the outer diameter of the small pipe body 4 to be tested is no more than 50 mm, which is a small pipe on a petrochemical device. Such a small pipe cannot be detected by a traditional pipeline magnetic leakage detector. The traditional pipeline magnetic leakage detector is large in size and is usually only used to detect pipe bodies 4 with a diameter of more than 50 mm, and is not suitable for corrosion detection of small pipes. At the same time, the length of the small pipe body 4 to be tested is no more than 200 mm, which is a short-circuited small pipe, and its outer end is usually equipped with valves, flanges, monitoring instruments and other components.

[0042] Optionally, the axial length of the magnet box 1 is 50-100 mm.

[0043] Specifically, for the detection of short-circuited small pipes with a length not exceeding 200 mm, the pipe body detection device for small pipes does not adopt a walking mechanism. The full-length detection of the small pipe can be achieved by manually moving the detection device along the axial direction of the pipe body 4. To further improve the detection efficiency, the magnet box 1 of the detection device is relatively long, with a length of 50-100 mm, taking into account the detection efficiency of the small pipes, as well as the flexibility and applicability of use.

[0044] Optionally, the material of the magnet box 1 is a permanent magnet.

[0045] Specifically, the magnet box 1 is made of permanent magnet material, and the magnetic poles at both ends of the magnet box 1 face the outer wall of the tube body 4 to be tested, which can fully magnetize the ferromagnetic tube body 4.

[0046] Optionally, ferromagnetic gaskets 7 are embedded at both end poles of the magnet box 1 .

[0047] Specifically, the ferromagnetic gaskets 7 embedded in the magnetic poles at both ends of the magnet box 1 can avoid direct contact between the permanent magnet and the ferromagnetic tube body 4 during the detection process, which would make it difficult to open and close the two magnet boxes 1, while ensuring the magnetization strength of the tube body 4 being tested, without affecting the ability of the two magnet boxes 1 to buckle together to form a ring structure.

[0048] Optionally, a groove 8 is provided in the middle of the inner circumference of the magnet box 1 , and the magnetically sensitive Hall element 5 is embedded in the groove 8 .

[0049] Specifically, a magnetically sensitive Hall element 5 is embedded in a groove 8 in the middle of the inner circumference of the magnet box 1 , and the magnetically sensitive Hall element 5 can be bonded to the groove 8 by using a high temperature resistant resin.

[0050] Optionally, when two magnet boxes 1 are connected by the snap-fit ​​component 3 to form a complete annular structure, a plurality of magnetically sensitive Hall elements 5 are evenly distributed along a plurality of virtual circles on the inner circumference of the annular structure.

[0051] Specifically, the magnetically sensitive Hall elements 5 are embedded in the groove 8 in a circular array. The number of magnetically sensitive Hall elements 5 can be adjusted according to the axial length of the magnet box 1 and the size of its inner radius. The arrangement principle is to ensure that the magnetically sensitive Hall elements 5 are evenly distributed on the circumference of the outer wall of the measured pipe body 4 within the detection length range of the detection device, so as to ensure that the measured pipe section will not be missed.

[0052] Optionally, at least one magnet box 1 is provided with a threading hole 9 , and the threading hole 9 is used for the outlet of the magnetically sensitive Hall element 5 .

[0053] Specifically, the two magnet boxes 1 are an upper box body and a lower box body respectively, and a threading hole 9 can be opened on the upper box body for the cable 10 of the magnetically sensitive Hall element 5 to pass through, so that the magnetically sensitive Hall element 5 is connected to the magnetic flux leakage detection instrument 6 to realize signal transmission.

[0054] Optionally, the outer side of the magnet box 1 is covered with a shell 11, and the shell 11 exposes the inner periphery and the magnetic poles at both ends of the magnet box 1.

[0055] Specifically, the setting of the shell 11 can protect the magnet box 1 and the components connected thereto to avoid collision and damage.

[0056] Optionally, the material of the shell 11 is a non-ferromagnetic material.

[0057] Specifically, the outer surface of the magnet box 1 is covered with a non-ferromagnetic shell 11, so as to protect the magnet box 1 and the ferromagnetic gasket 7 without affecting the accuracy of detection.

[0058] In summary, the pipe body detection device for small pipes provided by the present invention can be well applied to the defect detection of short-circuited small pipes, and is particularly suitable for the detection of corrosion defects of small pipes in petrochemical plants. The detection device can be used to realize rapid detection of corrosion defects of small pipes of petrochemical equipment and pipelines without stopping work, which can greatly improve the detection efficiency and accuracy compared with traditional detection methods. my country is a major petrochemical country, with a large number of domestic petrochemical plants. The number of small pipes in a single petrochemical plant is tens of thousands. For a long time, due to the limitations of detection methods, a large number of small pipes in petrochemical plants have not been inspected as frequently as they should be, resulting in the continuous occurrence of corrosion and leakage incidents of small pipes. Because the pipe body detection device for small pipes provided by the present invention simplifies the small pipe detection procedure and greatly improves the efficiency of small pipe defect detection, it will surely be widely used in the detection of corrosion defects of small pipes in petrochemical plants.

[0059] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A pipe body detection device for small pipes, characterized in that: include: Two semi-circular magnet boxes, one end of the two magnet boxes is hinged by a hinge component, and the other end of the two magnet boxes is provided with a buckle component, the buckle component is used to connect the two magnet boxes to form a complete circular ring structure, and the inner diameter of the circular ring structure matches the outer diameter of the tube body; A plurality of magnetically sensitive Hall elements, wherein the plurality of magnetically sensitive Hall elements are arranged on the inner periphery of the two magnet boxes, and when the two magnet boxes are connected by the buckle component to form a complete annular structure, the plurality of magnetically sensitive Hall elements are evenly distributed in an annular pattern on the inner periphery of the annular structure; A magnetic flux leakage detection instrument is electrically connected to the plurality of magnetically sensitive Hall elements.

2. The pipe body detection device for small pipes according to claim 1, characterized in that: The outer diameter of the tube body is not greater than 50 mm, and the length of the tube body is not greater than 200 mm.

3. The pipe body detection device for small pipes according to claim 1, characterized in that: The axial length of the magnet box is 50-100 mm.

4. The pipe body detection device for small pipes according to claim 1, characterized in that: The material of the magnet box is permanent magnet.

5. The pipe body detection device for small pipes according to claim 1, characterized in that: Ferromagnetic gaskets are embedded in the magnetic poles at both ends of the magnet box.

6. The pipe body detection device for small pipes according to claim 1, characterized in that: A groove is arranged in the middle of the inner circumference of the magnet box, and the magnetically sensitive Hall element is embedded in the groove.

7. The pipe body detection device for small pipes according to claim 1, characterized in that: When the two magnet boxes are connected by the snap-fit ​​component to form a complete annular structure, a plurality of magnetically sensitive Hall elements are evenly distributed along a plurality of virtual circles on the inner circumference of the annular structure.

8. The pipe body detection device for small pipes according to claim 1, characterized in that: At least one of the magnet boxes is provided with a threading hole, and the threading hole is used for the lead-out wire of the magnetically sensitive Hall element.

9. The pipe body detection device for small pipes according to claim 1, characterized in that: The outer side of the magnet box is covered with a shell, and the inner periphery and the magnetic poles at both ends of the magnet box are exposed by the shell.

10. The pipe body detection device for small pipes according to claim 9, characterized in that: The material of the shell is non-ferromagnetic material.

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