A kind of magnetic flux leakage detection equipment for high-low pressure buried steel pipeline

Abstract

The utility model discloses a kind of magnetic flux leakage detection equipment for high-low pressure buried steel pipeline, it is related to high-low pressure buried steel pipeline technical field, including first casing, the first casing one side surface is fixedly connected with the one end of first universal joint, the other end of the first universal joint is fixedly connected with second casing, the outer wall of the second casing is fixedly connected with first rubber bowl, the one side surface of the second casing is fixedly connected with the one end of second universal joint, the other end of the second universal joint is fixedly connected with third casing. The magnetic flux leakage detection equipment for high-low pressure buried steel pipeline can quickly adjust the position of permanent magnet, magnetic field sensor and steel brush simultaneously according to different sizes of the pipeline, effectively improve work efficiency, and the buffer can be disassembled as a whole, which is convenient for maintenance and replacement. In pipeline detection, the cooperation of the anti-collision head, spring and damping rod can effectively reduce the instantaneous impact force and avoid damage to the magnetic flux leakage detection equipment.

Description

Technical Field

[0001] This utility model relates to the field of high and low pressure buried steel pipeline technology, specifically a magnetic flux leakage detection device for high and low pressure buried steel pipelines. Background Technology

[0002] High and low pressure buried steel pipelines refer to steel pipelines used to transport liquids or gases. They are classified into high-pressure and low-pressure pipelines based on their operating pressure. As pipelines age, defects cannot be detected and repaired in a timely manner, posing operational risks. Furthermore, the company's current routine inspections and external testing methods are insufficient to effectively detect risks inherent in the pipeline itself. Long-term exposure to soil corrosion, groundwater erosion, and external loads makes pipelines prone to corrosion, cracks, and other defects. Magnetic flux leakage (MFL) testing equipment can detect pipeline corrosion, cracks, mechanical damage, and other defects.

[0003] Trenchless magnetic flux leakage (MFLL) detection technology utilizes the principle of magnetomechanics to apply excitation to the pipeline, creating a magnetic field around it. By detecting the magnetic field lines, the degree and location of magnetic anomalies caused by stress concentration can be identified. This technology can effectively detect defects in the pipeline itself, such as weld anomalies, wall thinning, and corrosion. It can serve as a means of inspecting pipeline defects that cannot be inspected internally. Existing technology (Chinese patent application CN201910731039.3, filed on 2019-08-08) involves a pipeline MFLL detection device in which multiple permanent magnets and multiple steel brushes are retractably connected to a first mounting plate via connecting rods and springs. Multiple magnetic field sensors are retractably connected to a second mounting plate. The ends of the multiple steel brushes form a closed loop for contact with the inner side of the circular pipe wall. Before installing the pipeline MFLL detection unit into the pipeline, the steel brushes and magnetic field sensors can be adjusted to a height suitable for the inner diameter of the pipeline. This ensures that after the pipeline MFLL detection device enters the pipeline, the steel brushes and magnetic field sensors are in close contact with the inner wall of the pipeline, improving detection accuracy while reducing detection costs.

[0004] Although existing technologies can improve detection efficiency, during operation, it is time-consuming, costly, and inefficient to adjust the permanent magnet, multiple steel brushes, and magnetic field sensors separately. Furthermore, it is not easy to quickly disassemble and assemble the buffer assembly, making it inconvenient to maintain and replace the buffer assembly. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic flux leakage detection device for high and low pressure buried steel pipelines, in order to solve the problems mentioned in the background art, which require separate adjustment of permanent magnets, multiple steel brushes and magnetic field sensors, which is time-consuming, costly and inefficient, and inconvenient for maintaining and replacing buffer components.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a magnetic flux leakage detection device for high and low pressure buried steel pipelines, comprising a first housing, one end of a first universal joint fixedly connected to one side surface of the first housing, a second housing fixedly connected to the other end of the first universal joint, a first rubber cup fixedly connected to the outer wall of the second housing, one end of a second universal joint fixedly connected to one side surface of the second housing, a third housing fixedly connected to the other end of the second universal joint, and a second rubber cup fixedly connected to the outer wall of the third housing.

[0007] The first housing has an adjustment component inside and a scissor linkage mechanism outside. The adjustment component acts to adjust the extension and retraction of the scissor linkage mechanism. A permanent magnet and a magnetic field sensor are fixedly connected to one side surface of the scissor linkage mechanism, and a steel brush is fixedly connected to the outside of the permanent magnet.

[0008] The first housing has a connector and a buffer on one side. The connector is used for the assembly and disassembly of the first housing and the buffer.

[0009] Furthermore, the second housing is provided with a first odometer wheel on its exterior. The first odometer wheels are symmetrically distributed about the central axis of the second housing. The first odometer wheels are rotatably connected to the second housing through a first support arm. The first support arm and the second housing are fixed together by a first locking nut. The third housing is provided with a second odometer wheel on its exterior. The second odometer wheels are symmetrically distributed about the central axis of the third housing. The second odometer wheels are rotatably connected to the third housing through a second support arm. The second support arm and the third housing are fixed together by a second locking nut.

[0010] Furthermore, the adjusting component includes an electric telescopic rod fixedly connected to the inner wall of the first housing. One end of the electric telescopic rod is fixedly connected to an annular block, and the outer wall of the annular block is rotatably connected to one end of a scissor linkage mechanism. The other end of the scissor linkage mechanism is rotatably connected to the outer wall of the first housing.

[0011] Furthermore, a guide rod is fixedly connected to one side surface of the first housing. There are three guide rods in total, and they are symmetrical about the central axis of the first housing. The inner wall of the annular block is provided with a guide hole whose internal size structure is consistent with the external size structure of the guide rod. At the same time, the annular block and the guide rod form a sliding mechanism through the guide hole.

[0012] Furthermore, the connector includes a fixing sleeve fixedly connected to one side surface of the first housing, and the inner wall of the fixing sleeve is connected to a fixing screw by a thread.

[0013] Furthermore, the buffer includes a frustum fixedly connected to one end of the fixing screw, and an anti-collision head is slidably connected to the inner wall of the frustum. The anti-collision head is hemispherical in shape.

[0014] Furthermore, a spring is provided between the anti-collision head and the truncated cone, and a damping rod is provided inside the spring. The anti-collision head and the truncated cone form an elastic mechanism through the spring and the damping rod.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This magnetic flux leakage detection device for high and low pressure buried steel pipelines adopts a novel structural design, the specific details of which are as follows:

[0016] (1) The leakage magnetic field detection equipment for high and low pressure buried steel pipelines is equipped with an adjustment component, a permanent magnet, a magnetic field sensor and a steel brush. It can simultaneously adjust the position of the permanent magnet, the magnetic field sensor and the steel brush according to the different dimensions of the pipeline, effectively shortening the adjustment time and improving work efficiency.

[0017] (2) The magnetic flux leakage detection equipment for high and low pressure buried steel pipelines is equipped with connectors and buffers. The buffers are detachably connected to the first housing through the connectors, and the buffers can be disassembled as a whole, which is convenient for maintenance and replacement. In the magnetic flux leakage detection work, the anti-collision head, spring and damping rod can effectively reduce the instantaneous impact force and avoid damage to the magnetic flux leakage detection equipment. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the anti-collision head and the first shell structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the explosion-proof structure of the anti-collision head of this utility model;

[0022] Figure 5 This is a schematic diagram of the first shell structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the first shell of the present invention in a cross-sectional state.

[0024] In the diagram: 1. First housing; 2. First universal joint; 3. Second housing; 4. First rubber cup; 5. First odometer wheel; 6. Second universal joint; 7. Third housing; 8. Second rubber cup; 9. Second odometer wheel; 10. Electric telescopic rod; 11. Ring block; 12. Scissor linkage mechanism; 13. Permanent magnet; 14. Magnetic field sensor; 15. Steel brush; 16. Fixing sleeve; 17. Fixing screw; 18. Frustum; 19. Anti-collision head; 20. Spring; 21. Damping rod; 22. Guide rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1: Please refer to Figures 1-3 , Figure 5 and Figure 6 This utility model provides the following technical solution: a magnetic flux leakage detection device for high and low pressure buried steel pipelines, disclosing an adjusting component, a permanent magnet 13, a magnetic field sensor 14, and a steel brush 15: It includes a first housing 1, one end of a first universal joint 2 fixedly connected to one side surface of the first housing 1, a second housing 3 fixedly connected to the other end of the first universal joint 2, a first rubber cup 4 fixedly connected to the outer wall of the second housing 3, one end of a second universal joint 6 fixedly connected to one side surface of the second housing 3, a third housing 7 fixedly connected to the other end of the second universal joint 6, and a second rubber cup 8 fixedly connected to the outer wall of the third housing 7; an adjusting component is provided inside the first housing 1, and a scissor linkage mechanism 12 is provided outside the first housing 1. The adjusting component acts on the extension and retraction adjustment of the scissor linkage mechanism 12. A permanent magnet 13 and a magnetic field sensor 14 are fixedly connected to one side surface of the scissor linkage mechanism 12, and a steel brush 15 is fixedly connected to the outer side of the permanent magnet 13. Figure 1 As shown, the second housing 3 has a first odometer wheel 5 on its exterior. The first odometer wheels 5 are symmetrically distributed about the central axis of the second housing 3, and are rotatably connected to the second housing 3 via a first support arm. The first support arm and the second housing 3 are fixed together by a first locking nut. The third housing 7 has a second odometer wheel 9 on its exterior. The second odometer wheels 9 are symmetrically distributed about the central axis of the third housing 7, and are rotatably connected to the third housing 7 via a second support arm. The second support arm and the third housing 7 are fixed together by a second locking nut. Figure 6As shown, the adjusting component includes an electric telescopic rod 10 fixedly connected to the inner wall of the first housing 1. One end of the electric telescopic rod 10 is fixedly connected to an annular block 11. The outer wall of the annular block 11 is rotatably connected to one end of a scissor linkage mechanism 12. The other end of the scissor linkage mechanism 12 is rotatably connected to the outer wall of the first housing 1. Figure 5 As shown, a guide rod 22 is fixedly connected to one side surface of the first housing 1. There are three guide rods 22 in total, and the guide rods 22 are symmetrical about the central axis of the first housing 1. The inner wall of the annular block 11 is provided with a guide hole whose internal size structure is consistent with the external size structure of the guide rod 22. At the same time, the annular block 11 and the guide rod 22 form a sliding mechanism through the guide hole.

[0027] In use, the annular block 11 can be extended or retracted by the electric telescopic rod 10 according to different pipe sizes. The annular block 11 slides on the outer wall of the guide rod 22 through the guide hole, and the guide rod 22 limits the movement of the annular block 11. When the annular block 11 extends, the scissor linkage mechanism 12 retracts; when the annular block 11 retracts, the scissor linkage mechanism 12 extends. The positions of the permanent magnet 13, the magnetic field sensor 14, and the steel brush 15 can be adjusted simultaneously. Through the sliding cooperation between the annular block 11 and the guide rod 22, combined with the telescopic movement of the scissor linkage mechanism 12, the fit of the detection components to different pipe diameters can be quickly adjusted. To avoid blind spots caused by changes in pipe size, the angles of the first mileage wheel 5 and the second mileage wheel 9 are adjusted so that they fit against the inner wall of the pipe. They are then fixed with the first locking nut and the second locking nut respectively. When the magnetic flux leakage detection device is working, the elastic deformation of the first rubber cup 4 and the second rubber cup 8 forms a sealing structure with the inner wall of the pipe. The device is propelled forward by the pressure difference of the medium. The steel brush 15 cleans the deposits on the inner wall of the pipe, and the permanent magnet 13 saturates the pipe wall through the steel brush 15. The magnetic field sensor 14 detects the pipe.

[0028] Example 2: Figures 1-4 The technical solution shown, based on Embodiment 1, also discloses a connector and a buffer. A connector and a buffer are provided on one side of the first housing 1. The connector facilitates the assembly and disassembly of the first housing 1 and the buffer. Figure 3 As shown, the connector includes a fixing sleeve 16 fixedly connected to one side surface of the first housing 1, and a fixing screw 17 is threadedly connected to the inner wall of the fixing sleeve 16, such as... Figure 6 As shown, the buffer includes a frustum 18 fixedly connected to one end of the fixing screw 17. An anti-collision head 19 is slidably connected to the inner wall of the frustum 18. The anti-collision head 19 is hemispherical in shape. Figure 6As shown, a spring 20 is provided between the anti-collision head 19 and the truncated cone 18. A damping rod 21 is provided inside the spring 20, and the anti-collision head 19 and the truncated cone 18 form an elastic mechanism through the spring 20 and the damping rod 21.

[0029] In use, the buffer is engaged with the internal thread groove of the fixing sleeve 16 via the fixing screw 17, and the buffer is installed on one side of the first housing 1. Conversely, the buffer can be disassembled as a whole for easy maintenance and replacement. In pipeline magnetic flux leakage detection, when an external impact force acts on the anti-collision head 19, the hemispherical structure of the anti-collision head 19 decomposes the impact force into axial pressure, and the spring 20 undergoes elastic deformation to absorb the impact energy. The damping rod 21 generates viscous damping through piston movement to consume the remaining energy and prevent the impact force from damaging the magnetic flux leakage detection equipment. At the same time, after the impact force disappears, the spring 20 pushes the anti-collision head 19 back to the initial position, effectively improving the protection capability of the magnetic flux leakage detection equipment.

[0030] The above is the entire working process of the device, and the contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic flux leakage detection device for high and low pressure buried steel pipelines, comprising a first housing (1), one end of a first universal joint (2) is fixedly connected to one side surface of the first housing (1), a second housing (3) is fixedly connected to the other end of the first universal joint (2), a first rubber cup (4) is fixedly connected to the outer wall of the second housing (3), one end of a second universal joint (6) is fixedly connected to one side surface of the second housing (3), a third housing (7) is fixedly connected to the other end of the second universal joint (6), and a second rubber cup (8) is fixedly connected to the outer wall of the third housing (7); Its features are: The first housing (1) is provided with an adjustment component inside, and a scissor linkage mechanism (12) is provided outside the first housing (1). The adjustment component acts on the extension and retraction adjustment of the scissor linkage mechanism (12). A permanent magnet (13) and a magnetic field sensor (14) are fixedly connected to one side surface of the scissor linkage mechanism (12). A steel brush (15) is fixedly connected to the outside of the permanent magnet (13). The first housing (1) is provided with a connector and a buffer on one side. The connector is used for the disassembly and assembly of the first housing (1) and the buffer.

2. The magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 1, characterized in that: The second housing (3) is provided with a first odometer wheel (5) on its exterior. The first odometer wheels (5) are symmetrically distributed about the central axis of the second housing (3). The first odometer wheels (5) are rotatably connected to the second housing (3) through a first support arm. The first support arm and the second housing (3) are fixed together by a first locking nut. The third housing (7) is provided with a second odometer wheel (9) on its exterior. The second odometer wheels (9) are symmetrically distributed about the central axis of the third housing (7). The second odometer wheels (9) are rotatably connected to the third housing (7) through a second support arm. The second support arm and the third housing (7) are fixed together by a second locking nut.

3. The magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 1, characterized in that: The adjusting component includes an electric telescopic rod (10) fixedly connected to the inner wall of the first housing (1). One end of the electric telescopic rod (10) is fixedly connected to an annular block (11). The outer wall of the annular block (11) is rotatably connected to one end of a scissor linkage mechanism (12). The other end of the scissor linkage mechanism (12) is rotatably connected to the outer wall of the first housing (1).

4. The magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 2, characterized in that: A guide rod (22) is fixedly connected to one side surface of the first housing (1). There are three guide rods (22) in total, and the guide rods (22) are symmetrical about the central axis of the first housing (1). The inner wall of the annular block (11) is provided with a guide hole whose internal size structure is consistent with the external size structure of the guide rod (22). At the same time, the annular block (11) and the guide rod (22) form a sliding mechanism through the guide hole.

5. The magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 1, characterized in that: The connector includes a fixing sleeve (16) fixedly connected to one side surface of the first housing (1), and the inner wall of the fixing sleeve (16) is connected to a fixing screw (17) by a thread.

6. The magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 5, characterized in that: The buffer includes a frustum (18) fixedly connected to one end of the fixing screw (17), and an anti-collision head (19) is slidably connected to the inner wall of the frustum (18). The anti-collision head (19) is hemispherical in shape.

7. A magnetic flux leakage detection device for high and low pressure buried steel pipelines according to claim 6, characterized in that: A spring (20) is provided between the anti-collision head (19) and the truncated cone (18). A damping rod (21) is provided inside the spring (20), and the anti-collision head (19) and the truncated cone (18) form an elastic mechanism through the spring (20) and the damping rod (21).

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