Small-pipe-diameter internal penetration type detection probe based on alternating-current electromagnetic field

Abstract

The utility model belongs to the technical field of detection probes, and particularly relates to a small-pipe-diameter internal-penetrating type detection probe based on an alternating-current electromagnetic field, which comprises a joint, a port of the joint is communicated and fixed with a wire pipe along the axial direction, a port of the wire pipe far away from the joint is communicated and fixed with a shell head along the axial direction, and a plurality of elastic air bags are distributed on the outer side of the wire pipe along a circumferential array. The sides, close to each other, of the elastic air bags are fixedly connected to the outer side of the line pipe, an inflation pipe is inserted into the connector, one end of the inflation pipe extends out of the connector to be communicated with the elastic air bags, air inlets of the elastic air bags are fixedly communicated with branch pipes, and the ends, away from the elastic air bags, of the branch pipes extend into the inflation pipe. A coiling section is integrally installed at the end, located outside the line pipe, of the inflation pipe and surrounds the line pipe, and the end, away from the inflation pipe, of the coiling section is closed. The annular elastic sheath is used for driving the detection probe to suspend in the pipeline, the weight increment of the detection probe is not obvious, and the friction feeling between the detection probe and the lower wall of the pipeline can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection probes, and particularly relates to a small-diameter inner-penetrating detection probe based on an alternating current electromagnetic field. Background Art

[0002] AC electromagnetic field-based detection probes are mainly used in AC electromagnetic field testing (ACFM) technology, which is a non-contact, calibration-free, non-destructive testing method that is particularly suitable for detecting crack defects on the surface and near the surface of various ferromagnetic and non-ferromagnetic materials.

[0003] Cracks can occur on both the inner and outer surfaces of a pipe. External surface cracks can be detected directly with a handheld probe, while internal surface cracks require the probe to be inserted into the pipe and extended to a specific location. In the case of curved pipes, the probe must have a certain degree of bending ability.

[0004] When the diameter of the pipeline is small, the inserted detection probe will scratch the inner wall of the pipeline, especially the sharp edge of the crack can easily scratch the detection probe. The outer wall of the detection probe is wrapped with a rubber layer for protection. If a thin rubber layer is used, the anti-puncture effect is poor. If a thicker rubber layer is used, the detection probe will increase in weight significantly. When passing through a small-diameter pipeline, the friction of the lower wall is obvious. For this reason, we propose a small-diameter internal penetration detection probe based on an AC electromagnetic field. Utility Model Content

[0005] The purpose of this utility model is to provide a small-diameter internal penetration detection probe based on an AC electromagnetic field. The annular elastic outer sheath is used to drive the detection probe to suspend in the pipeline. The weight of the detection probe does not increase significantly, which can reduce the friction with the lower wall of the pipeline.

[0006] The technical solutions adopted in this application are as follows:

[0007] A small-diameter internal penetration detection probe based on an AC electromagnetic field includes a connector, the connector port is axially connected to a wire tube, the port of the wire tube away from the connector is axially connected to a shell head, a plurality of elastic airbags are distributed along a circumferential array on the outside of the wire tube, and the sides of the elastic airbags close to each other are fixedly connected to the outside of the wire tube, an inflation tube is inserted into the connector, and one end of the inflation tube extends out of the connector and is connected to the elastic airbag. During detection, the cable, connector, wire tube and shell head are pushed into a pipe with a smaller diameter. At this time, the air outlet of the micro air pump is opened to pump air into the inflation tube until All elastic airbags expand to form an annular elastic outer sheath, which wraps the wire tube and is close to the inner wall of the pipe, driving the entire small-diameter internal penetration detection probe to suspend in the pipe, separating the sharp inner edge of the pipe, and then pushing the small-diameter internal penetration detection probe and the annular elastic outer sheath forward inside the pipe to reach the designated position. Detection is performed based on the AC electromagnetic field. Since the inside of the annular elastic outer sheath is filled with air, the weight of the small-diameter internal penetration detection probe is not significantly increased and is basically negligible, which can reduce the friction with the lower wall of the pipe. In addition, the annular elastic outer sheath has good elasticity and can be bent 360°, and can adaptively deform in the curved section of the pipe.

[0008] The air inlets of the elastic airbags are all connected and fixed with branch pipes, and the ends of the branch pipes away from the elastic airbags extend into the interior of the inflation tube. Several branch pipes drain the airflow in the inflation tube and deliver it to each elastic airbag at the same time, facilitating synchronous expansion.

[0009] The inflation tube is integrally installed with a coiled section at one end located outside the wire pipe. The coiled section surrounds the wire pipe, and the coiled section is closed at the end away from the inflation tube. After the micro air pump is started, the coiled section transports airflow as an air source, while stably supplying air to each branch pipe and supporting the branch pipe to resist the extrusion effect when the elastic airbag is deformed.

[0010] The outer sleeve of the wire pipe is provided with a rubber sleeve, which is provided on the outside of several branch pipes and serves as a protective layer on the outside of the branch pipes to resist the puncture effect of the sharp inner edge of the pipe and improve the safety of the branch pipes.

[0011] A stainless steel ring is fixed to the outer edge of the joint near the shell head, and the inner side of the stainless steel ring is fixedly connected to the outer side of the wire pipe. The stainless steel ring is used to increase the connection area between the joint and the wire pipe, thereby improving the stability of the connection. The stainless steel ring is penetrated by the inflation tube, and the stainless steel ring can be used to further support the inflation tube.

[0012] The end of the inflation tube away from the wire pipe is fixedly connected to a hose, which can extend in the pipeline and adaptively deform along with the curved section of the pipeline. After deformation, it can remain unobstructed, so as to ensure stable connection and gas supply between the inflation tube and the micro air pump.

[0013] The technical effects achieved by this utility model are:

[0014] The utility model discloses a small-diameter internal penetration detection probe based on an alternating current electromagnetic field. During detection, the cable, connector, wire tube and shell head are pushed into a pipe with a smaller diameter. At this time, the air outlet of the micro air pump is opened to pump air into the inflation tube until all the elastic air bags are expanded to form an annular elastic outer sheath, which wraps the wire tube and is close to the inner wall of the pipe, driving the entire small-diameter internal penetration detection probe to be suspended in the pipe, separating the sharp inner edge of the pipe, and then pushing the small-diameter internal penetration detection probe and the annular elastic outer sheath forward inside the pipe to reach the designated position. Detection is performed based on the alternating current electromagnetic field. Since the inside of the annular elastic outer sheath is filled with air, the weight increase of the small-diameter internal penetration detection probe is not obvious and can be basically ignored, which can reduce the friction with the lower wall of the pipe. In addition, the annular elastic outer sheath has good elasticity and can be bent 360 degrees, and can adaptively deform in the curved section of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the main view of a practical small-diameter internal penetration detection probe based on AC electromagnetic field;

[0016] Figure 2 This is the main view of the practical connector box shell after assembly;

[0017] Figure 3 This is a front view of the practical elastic airbag;

[0018] Figure 4 It is a front view of the practical inflation tube.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1. Connector; 2. Wire tube; 3. Shell head; 4. Elastic airbag; 5. Inflatable tube; 6. Branch tube; 7. Coiled section; 8. Rubber sleeve; 9. Stainless steel ring; 10. Hose. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of this utility more clear, the utility is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of this utility and does not strictly limit the scope of protection specifically requested by this utility.

[0022] like Figure 1-4As shown, a small-diameter internal penetration detection probe based on an AC electromagnetic field includes a connector 1, and a Chinese utility model with reference publication number CN212989236U is a small-diameter internal penetration detection probe based on an AC electromagnetic field. The connector 1 can be installed with a U-shaped magnetic core, a coil, a TMR tunnel magnetoresistive sensor, a sensor fixing block, a power supply port, a filter resistor, an AD620 chip, an input port, a filter capacitor, a PCB circuit board, an amplifying resistor and an output port. This technical means is a prior art and is not drawn in the figure. The port of the connector 1 is axially connected to and fixed with a wire tube 2, and the port of the wire tube 2 away from the connector 1 is axially connected to and fixed with a shell head 3, and a Morey connector is installed on the shell head 3. This technical means is a prior art and is not drawn in the figure. A plurality of elastic air bags 4 are distributed along a circumferential array on the outside of the wire tube 2, and the sides of the elastic air bags 4 close to each other are fixedly connected to the outside of the wire tube 2. An inflation tube 5 is inserted into the inside of the connector 1, and one end of the inflation tube 5 extends out The interior of the connector 1 is connected to the elastic airbag 4. A micro air pump is prepared and shares a mobile power supply with the small-diameter internal penetration detection probe. The connector 1 is electrically connected to the detection terminal. During detection, the cable is pushed, and the connector 1, wire tube 2 and shell head 3 are inserted into the pipe with a smaller diameter. At this time, the air outlet of the micro air pump is opened to pump air into the inflation tube 5 until all the elastic airbags 4 are inflated to form an annular elastic outer sheath, which wraps the wire tube 2 and is close to the inner wall of the pipe, driving the entire small-diameter internal penetration detection probe to suspend in the pipe, separating the sharp inner edge of the pipe, and then pushing the small-diameter internal penetration detection probe and the annular elastic outer sheath forward inside the pipe to reach the designated position. Detection is performed based on the AC electromagnetic field. Since the inside of the annular elastic outer sheath is filled with air, the weight of the small-diameter internal penetration detection probe is not significantly increased and is basically negligible, which can reduce the friction with the lower wall of the pipe. In addition, the annular elastic outer sheath has good elasticity and can be bent 360°, and can adapt to deformation in the curved section of the pipe.

[0023] The elastic airbag 4 can be made of EPDM rubber, which offers excellent puncture and friction resistance. It can be in the form of an elongated strip. When the micro-air pump is activated, it expands toward the exterior of the conduit 2, remaining tightly against the conduit 2 without leaving any gaps. After stopping the micro-air pump, the valve on the micro-air pump's output port is closed to keep the elastic airbag 4 inflated. Finally, the detection probe is removed from the conduit, and the valve is opened to expel excess air from the elastic airbag 4.

[0024] like Figure 3 and Figure 4 As shown, the air inlets of the elastic airbags 4 are all connected and fixed with branch pipes 6, and the ends of the branch pipes 6 away from the elastic airbags 4 extend into the interior of the inflation tube 5. Several branch pipes 6 drain the airflow in the inflation tube 5 and simultaneously deliver it to each elastic airbag 4 to facilitate synchronous expansion.

[0025] like Figure 3 and Figure 4As shown, the inflation tube 5 is integrally installed with a coiled section 7 at one end outside the wire tube 2. The coiled section 7 surrounds the wire tube 2, and the coiled section 7 is closed at the end away from the inflation tube 5. After the micro air pump is started, the coiled section 7 transports airflow as the air source, and at the same time stabilizes the air supply to each branch tube 6 and supports the branch tube 6 to resist the extrusion effect when the elastic airbag 4 is deformed.

[0026] like Figure 1 and Figure 2 As shown, the outer sleeve of the wire pipe 2 is provided with a rubber sleeve 8, which can be made of silicone material. The rubber sleeve 8 is provided on the outside of several branch pipes 6 and serves as a protective layer on the outside of the branch pipe 6 to resist the puncture effect of the sharp inner edge of the pipe and improve the safety of the branch pipe 6.

[0027] like Figure 1 、 Figure 3 and Figure 4 As shown, a stainless steel ring 9 is fixed to the outer edge of the connector 1 near the shell head 3, and the inner side of the stainless steel ring 9 is fixedly connected to the outer side of the wire pipe 2. The stainless steel ring 9 is used to increase the connection area between the connector 1 and the wire pipe 2, thereby improving the stability of the connection. In addition, the stainless steel ring 9 is penetrated by the inflation tube 5, and the stainless steel ring 9 can be used to further support the inflation tube 5.

[0028] like Figure 1 and Figure 3 As shown, the end of the inflation tube 5 away from the wire tube 2 is fixedly connected to a hose 10. The hose 10 can extend in the pipeline and adaptively deform along with the bending section of the pipeline. After deformation, it can still remain unobstructed, so as to provide stable connection and gas supply between the inflation tube 5 and the micro air pump.

[0029] The working principle of this utility model is: during detection, the cable is pushed, and the connector 1, the wire tube 2 and the shell head 3 are inserted into the pipe with a smaller diameter. At this time, the air outlet of the micro air pump is opened to pump air into the inflation tube 5 until all the elastic air bags 4 are expanded to form an annular elastic outer sheath, which wraps the wire tube 2 and is close to the inner wall of the pipe, driving the entire small-diameter internal penetration detection probe to be suspended in the pipe, separating the sharp inner edge of the pipe, and then pushing the small-diameter internal penetration detection probe and the annular elastic outer sheath forward inside the pipe to reach the designated position. Detection is performed based on the AC electromagnetic field. Since the inside of the annular elastic outer sheath is filled with air, the weight increase of the small-diameter internal penetration detection probe is not obvious and can be basically ignored, which can reduce the friction with the lower wall of the pipe.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this application shall be implemented in accordance with conventional means in the art unless otherwise specified or limited.

Claims

1. A small-diameter internal penetration detection probe based on an alternating current electromagnetic field, comprising a connector (1), characterized in that: The connector (1) is connected to and fixed with a wire tube (2) along the axial direction, and the port of the wire tube (2) away from the connector (1) is connected to and fixed with a shell head (3) along the axial direction. A plurality of elastic air bags (4) are distributed along a circumferential array on the outside of the wire tube (2), and the sides of the elastic air bags (4) close to each other are fixedly connected to the outside of the wire tube (2). An inflation tube (5) is inserted into the interior of the connector (1), and one end of the inflation tube (5) extends out of the interior of the connector (1) and is connected to the elastic air bag (4).

2. The AC electromagnetic field-based small-diameter internal penetration detection probe according to claim 1, characterized in that: The air inlets of the elastic airbags (4) are all connected and fixed with branch pipes (6), and the ends of the branch pipes (6) away from the elastic airbags (4) extend into the interior of the inflation tube (5).

3. The AC electromagnetic field-based small-diameter internal penetration detection probe according to claim 1, characterized in that: A coiling section (7) is integrally mounted on one end of the inflation tube (5) located outside the wire tube (2), the coiling section (7) surrounds the wire tube (2), and the end of the coiling section (7) away from the inflation tube (5) is in a closed shape.

4. The AC electromagnetic field-based small-diameter internal penetration detection probe according to claim 2, characterized in that: The outer portion of the wire tube (2) is provided with a rubber sleeve (8), and the rubber sleeve (8) is sleeved on the outer portion of a plurality of branch pipes (6).

5. The small-diameter internal penetration detection probe based on AC electromagnetic field according to claim 1, characterized in that: A stainless steel ring (9) is fixed to the outer edge of the joint (1) close to the shell head (3), and the inner side of the stainless steel ring (9) is fixedly connected to the outer side of the wire tube (2).

6. The AC electromagnetic field-based small-diameter internal penetration detection probe according to claim 1, characterized in that: One end of the inflation tube (5) away from the line tube (2) is fixedly connected to a hose (10).

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