Pipeline inspection pig with multi-layer foam

Abstract

The present invention provides a pipeline inspection pig with a multi-layer foam body. The pipeline inspection pig of the present invention includes a pig body and a foam body assembly disposed outside the pig body; wherein, the foam body assembly includes at least two layers of foam bodies sleeved in sequence, and at least one layer of the foam body has a different material and / or density from other foam bodies, so that the hardness of the foam bodies of the foam body assembly is different and the flexibility is different, which is beneficial to improving the passability of the pipeline inspection pig, making it easier to pass through some pipelines with larger bending degrees and reducing the risk of blockage of the pipeline inspection pig. Moreover, the outermost layer of the foam body is in interference fit with the pipeline to be measured, ensuring that there is and maintains a certain pressure difference between the front and rear ends of the pipeline inspection pig, so that the pipeline inspection pig operates stably.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and particularly relates to a pipeline detection pig with multiple layers of foams. Background Art

[0002] Pipeline transportation is an important transportation method in the transportation of oil and natural gas. During the long-term transportation of oil and gas pipelines, due to the influence of external factors such as earthquakes, construction, rain and snow weather, blockage problems occur. In severe cases, it may even lead to oil and gas leakage, causing economic losses and environmental pollution. Therefore, it is necessary to regularly clean and dredge oil and gas pipelines.

[0003] In the prior art, generally, a pig is used to clean and dredge oil and gas pipelines, and sensors are arranged on the pig to detect oil and gas pipelines. The pig usually uses a polyurethane foam as a carrier, and sensors are arranged on it through a rigid bracket. The polyurethane foam is in interference fit with the inner wall of the oil and gas pipeline to achieve sealing, so that a pressure difference is generated before and after the polyurethane foam, thereby making the pig move forward.

[0004] However, using a single polyurethane foam to cover the outside of the pig, the hardness of the foam is the same and the flexibility is single. Using a rigid bracket to fix the sensor will form a rigid skeleton with a relatively large diameter. Especially in complex pipelines, the passability of the pig is limited, and it is easy to get stuck, resulting in production stagnation and further economic losses. Summary of the Invention

[0005] The present invention provides a pipeline detection pig with multiple layers of foams to solve the technical problem that the foam on the outside of the existing pig has the same hardness and single flexibility, resulting in limited passability of the pig in the oil and gas pipeline and easy to get stuck, causing production stagnation.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a pipeline detection pig, which includes: a pig body and a foam assembly arranged outside the pig body; the foam assembly includes at least two layers of foams sleeved in sequence, and at least one of the foams is different from other foams in material and / or density; the outermost foam is in interference fit with the pipeline to be detected.

[0008] As an improvement of the above pipeline detection pig of the present invention, the pipeline detection pig further includes a plurality of sensors; all the sensors are installed on the same layer of the foam; or, the sensors are installed on different layers of the foam.

[0009] As an improvement of the above pipeline inspection pig of the present invention, an installation groove and / or an installation post for installing the sensor are provided on the foam body.

[0010] As an improvement of the above pipeline inspection pig of the present invention, the positions of each of the sensors in the radial and axial directions of the outermost foam body are different.

[0011] As an improvement of the above pipeline inspection pig of the present invention, the sensor is one or more of the following sensors: a deformation sensor, a force sensor, an image sensor, a sound sensor, a magnetic sensor, a position sensor, an optical sensor, and a pipe diameter measurement sensor.

[0012] As an improvement of the above pipeline inspection pig of the present invention, the pig body includes a cavity, a first end cover sealingly connected to the first end of the cavity, and a second end cover sealingly connected to the second end of the cavity. The first end cover, the cavity, and the second end cover form a sealed installation space, and a controller is provided in the sealed installation space; a wire passing channel is provided on the first end cover, the first end of the wire is electrically connected to the controller, and the second end of the wire passes through the wire passing channel and is electrically connected to the sensor.

[0013] As an improvement of the above pipeline inspection pig of the present invention, an electrical connector is installed in the wire passing channel, and the first end of the wire is electrically connected to the controller through the electrical connector.

[0014] As an improvement of the above pipeline inspection pig of the present invention, adjacent two layers of the foam bodies are connected together by a foaming process, or adjacent two layers of the foam bodies are bonded together.

[0015] As an improvement of the above pipeline inspection pig of the present invention, the outer diameter of the outermost foam body is 101%-120% of the inner diameter of the pipeline to be measured; and / or, the innermost foam body is cylindrical, and the radial distance between the outer surface of the innermost foam body and the inner surface of the pipeline to be measured is 30-40 mm.

[0016] As an improvement of the above pipeline inspection pig of the present invention, a guiding inclined surface is provided at the front end of the foam body assembly.

[0017] Compared with the prior art, the pipeline inspection pig provided by the present invention has the following advantages:

[0018] The pipeline inspection pig of the present invention includes a pig body and a foam body assembly disposed outside the pig body; wherein, the foam body assembly includes at least two layers of foams sleeved in sequence, and at least one layer of foam has a different material and / or density from other foams, so that the hardness of the foams in the foam body assembly is different and the flexibility is different, which is beneficial to improving the passability of the pipeline inspection pig; on the other hand, the spatial distribution position of the sensor is adjusted by the outer shape dimensions and installation grooves or installation posts of different layers of foams, which can replace the rigid skeleton support, and it is easier to pass through some pipelines with a larger bending degree, reducing the risk of blockage of the pipeline inspection pig. Moreover, the outermost layer of foam is in interference fit with the pipeline to be measured, ensuring that there is and maintains a certain pressure difference between the front and rear ends of the pipeline inspection pig, so that the pipeline inspection pig operates stably.

[0019] In addition to the technical problems solved by the present invention, the technical features constituting the technical solution, and the beneficial effects brought by the technical features of these technical solutions described above, the other technical problems that the pipeline inspection pig provided by the present invention can solve, the other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the pipeline inspection pig provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the pipeline inspection pig during operation provided by an embodiment of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the pipeline inspection pig after primary foaming provided by an embodiment of the present invention;

[0023] Figure 4 It is a sectional view of the pipeline inspection pig after primary foaming provided by an embodiment of the present invention;

[0024] Figure 5 It is a left view of the pipeline inspection pig after primary foaming provided by an embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the first end cap of the pipeline inspection pig provided by an embodiment of the present invention;

[0026] Figure 7 It is a schematic structural diagram of a single-layer foam of the foam body assembly provided by an embodiment of the invention;

[0027] Figure 8 It is a schematic structural diagram of a single-layer foam of the foam body assembly provided by another embodiment of the present invention.

[0028] Description of the reference numerals in the drawings:

[0029] 11: Cavity; 12: First end cap; 121: Wire passing channel; 122: End cap body; 123: Mounting ring; 124: Wire passing hole; 125: First connection hole; 13: Second end cap; 131: Traction pull ring;

[0030] 2: Foam component; 21: Mounting groove; 22: Guiding inclined surface; 23: Single-layer foam; 231: First sub-foam; 232: Second sub-foam;

[0031] 3: Sensor;

[0032] 4: Wire;

[0033] 5: Sealant;

[0034] 6: Wire seal plug;

[0035] 7: Electrical connector;

[0036] 81: First fastening screw; 82: First sealing ring;

[0037] 91: Second fastening screw; 92: Second sealing ring;

[0038] 10: Pipeline to be measured;

[0039] 20: Wedge-shaped part. Detailed implementation manners

[0040] During long-term operation, oil and gas pipelines are prone to blockage due to external factors. In severe cases, it may even lead to the leakage of the transported medium, resulting in economic losses and environmental pollution. Therefore, it is essential to clean and dredge the pipelines. The pig is an important device for pipeline cleaning, and on this basis, a detection pig with the function of in-pipeline detection has been developed.

[0041] Generally, polyurethane foam is mostly used as a carrier for the detection pig, which is wrapped outside the pig body. However, the foam of this type of pig is single and has the same hardness, resulting in limited passability. Moreover, the sensor is installed on the pig body through a mounting bracket, and the sensor layout is difficult, resulting in few functions for measuring the internal conditions of the pipeline, which is not conducive to its popularization and use. Therefore, it is urgent to develop a new type of flexible pig to solve the problems of insufficient flexibility and simple detection function of the existing pigs.

[0042] To this end, the present invention provides a pipeline inspection pig, which wraps the pig body with a multi-layer foam body. The foam body has different hardnesses and good flexibility. The spatial distribution position of the sensor is adjusted by the outer dimension and the mounting groove or mounting post of different layers of the foam body. It can replace the rigid skeleton support and easily pass through the elbow pipeline with a smaller radius of curvature. The sensor can be installed on the foam body, improving the sensor mounting capacity and enhancing the detection function of the pig.

[0043] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0044] Referring to Figure 1 and Figure 2 The pipeline inspection pig provided by the embodiment of the present invention includes: a pig body and a foam body assembly 2 arranged outside the pig body; the foam body assembly 2 includes at least two layers of foam bodies sleeved in sequence, and at least one layer of the foam body has a different material and / or density from other foam bodies; the outermost foam body is in interference fit with the pipeline to be detected 10.

[0045] Among them, the pig body has a receiving cavity, and a controller, a battery, a memory, etc. are installed inside. The controller is used to receive the detection signals of the sensors and process the detection data. The controller can also store the processed detection data in the memory. The battery powers electronic devices such as the controller, the memory, and the sensors. The pig body may include a cylinder body and end covers hermetically connected to both ends of the cylinder body, so as to form a sealed receiving cavity; or, the pig body may further include a housing and a sealing door. The side of the housing has an opening, and the sealing door is hermetically installed on the opening, so as to form a sealed receiving cavity. Of course, the pig body may also be other structures.

[0046] A foam body assembly 2 is arranged outside the pig body. The foam body assembly 2 includes at least two layers of foam bodies, and at least two layers of foam bodies are sleeved in sequence. The foam body assembly 2 may include two layers, three layers, four layers, etc. of foam bodies, and the multiple layers of foam bodies are sleeved in sequence. Taking the foam body assembly 2 including three layers of foam bodies as an example for description, for the convenience of description, the foam body closest to the pig body is the first foam body, the foam body closest to the oil and gas pipeline is the second foam body, and the foam body between the first foam body and the second foam body is the third foam body. The first foam body is coated on the outside of the pig body, the third foam body is coated on the outside of the first foam body, and the second foam body is coated on the outside of the third foam body.

[0047] At least one layer of the foam has a different material and / or density from the other foams, that is, at least one layer of the foam has a different material from the other foams, or a different density, or both different material and density. Taking the foam assembly including two layers of foam, namely the first foam and the second foam, as an example, the first foam and the second foam have different materials. At this time, the densities of the first foam and the second foam can be the same or different; or, the densities of the first foam and the second foam are different. At this time, the materials of the first foam and the second foam can be the same or different; or, the materials and densities of the first foam and the second foam are both different.

[0048] At least one layer of the foam has a different material from the other foams. For example, the material of the first foam is different from that of the other foams, or the material of the second foam is different from that of the other foams, or the material of the third foam is different from that of the other foams. Among them, one layer of the foam in the foam assembly 2 can be at least one of polystyrene foam, polyurethane foam, polyvinyl chloride foam, polyethylene foam, urea formaldehyde foam, phenolic foam. For example, the first foam is polystyrene foam, and the second foam and the third foam can be foams of any material other than polystyrene foam, or can be polystyrene. In one possible embodiment, the materials of each layer of the foam are different. For example, the first foam is polystyrene foam, the second foam is polyurethane foam, and the third foam is polyvinyl chloride foam. Those skilled in the art can set the materials of each layer of the foam according to costs, the connectivity between each foam, the flexibility requirements, etc.

[0049] The outermost layer of the foam has an interference fit with the pipeline to be measured 10, that is, the outermost layer of the foam is a cylindrical structure, and the outermost layer of the foam has an interference fit with the pipeline to be measured 10. In this way, there is a pressure difference between the media at the front and rear ends of the pipeline inspection pig, so that it moves forward. The interference fit ensures that there is a certain pressure difference between the front and rear ends of the pipeline inspection pig, so that the pipeline inspection pig operates stably. In one possible implementation manner, the outer diameter of the outermost layer of the foam is 101%-120% of the inner diameter of the pipeline to be measured 10. In this way, it can be avoided that the outer diameter of the outermost layer of the foam is too small to have an interference fit with the pipeline to be measured 10, and it can also be avoided that the outer diameter of the outermost layer of the foam is too large to be assembled into the pipeline to be measured 10.

[0050] It should be understood that except that the outermost layer of the foam is a cylindrical structure, the cross-sections of the other layers of the foam can be triangular, rectangular, elliptical or irregular shapes, etc. Those skilled in the art can set them according to the foam mold, processing convenience, nesting stability, etc.

[0051] In one possible implementation, the adjacent two layers of foams are connected together by a foaming process, that is, a multi-layer foam assembly 2 is formed by foaming layer by layer using a mold, so that the processing of the foam assembly 2 is simple and convenient.

[0052] In another possible implementation, the adjacent two layers of foams are bonded together, that is, multiple foams are separately processed using a mold and then bonded layer by layer, so that multiple molds can foam simultaneously and then be bonded and assembled to form the foam assembly 2, which is beneficial to mass production.

[0053] The pipeline inspection pig provided by the embodiment of the present invention includes a pig body and a foam assembly arranged outside the pig body; wherein, the foam assembly includes at least two layers of foams sleeved in sequence, and at least one layer of foam has a different material or / and density from other foams, so that the hardness of the foams in the foam assembly is different and the flexibility is different, which is beneficial to improving the passability of the pipeline inspection pig and making it easier to pass through some pipelines with a larger bending degree, reducing the risk of blockage of the pipeline inspection pig. Moreover, the outermost layer of foam is in interference fit with the pipeline to be detected, ensuring that there is and maintains a certain pressure difference between the front and rear ends of the pipeline inspection pig, so that the pipeline inspection pig operates stably.

[0054] It should be noted here that the pipeline inspection pig provided by the present invention can be applied to various pipelines, such as oil and gas pipelines, thermal pipelines, water supply pipelines, etc. The present invention does not limit the application scenarios of the pipeline inspection pig.

[0055] On the basis of the above embodiments, referring to Figure 3 , the pipeline inspection pig of this embodiment further includes a plurality of sensors 3; all the sensors 3 are installed on the same layer of foam; or the sensors 3 are installed on different layers of foam.

[0056] Among them, the sensor 3 can be one or more of the following sensors: deformation sensor, force sensor, image sensor, acoustic sensor, magnetic sensor, position sensor, optical sensor, pipe diameter measurement sensor. For example, in order to detect the deformation at different radial positions of the pipeline to be measured, multiple deformation sensors are provided, and the multiple deformation sensors are arranged at intervals along the circumferential direction of the pipeline to be measured on the same foam layer; for another example, a deformation sensor can be provided on the foam assembly 2 to detect the deformation of the pipeline to be measured, and at the same time, a force sensor can also be provided on the foam 2 to detect the pressure of the pipeline to be measured to judge the deformation of the pipeline to be measured. In addition, the image sensor is used to detect the image inside the pipeline to be measured, the acoustic sensor is used to detect the acoustic emission signal formed by pipeline leakage, the magnetic sensor is used to detect defects such as cracks and corrosion pits on the inner wall of the pipeline, the position sensor is used to determine the position of the pipeline inspection pig in the pipeline to be measured, the optical sensor is used to detect the wax deposition and deformation of the pipe wall through the reflection state of the laser emitted on the inner wall of the pipeline, and the pipe diameter measurement sensor is used to detect the inner diameter of the pipeline to be measured. Of course, it should be noted that the sensor 3 on the pipeline inspection pig provided by the embodiments of the present invention is not limited to the above-listed sensor types, and those skilled in the art can set it according to the data to be detected actually.

[0057] In this embodiment, the function of the pipeline inspection pig is improved by setting multiple sensors 3, and thus the detection function of the pipeline inspection pig is improved.

[0058] In order to install the sensor 3, an installation groove 21 and / or an installation post for installing the sensor 3 are provided on the foam. In some embodiments, referring to Figure 3 , an installation groove 21 is provided on the foam, so that the sensor 3 is installed in the installation groove 21. Among them, the installation groove 21 can be a circular groove, a square groove or a groove with an irregular shape, etc., and those skilled in the art can set it according to the actual needs of the sensor 3. In other embodiments, an installation post is provided on the foam, so that the sensor 3 is installed on the installation post. Among them, the installation post can be a cylinder, a prism or a column with an irregular shape, etc., and those skilled in the art can set it according to the actual needs of the sensor 3. In still other embodiments, both an installation groove 21 and an installation post are provided on the foam, and sensors 3 with different installation requirements are installed respectively. It should be noted here that those skilled in the art can set the specific structures and quantities of the installation groove 21 and the installation post according to the type and quantity of the sensor 3. Of course, for some sensors 3, they can be directly pasted on the surface of the foam.

[0059] In addition, the installation groove 21 and the installation posts can be formed by setting a mold during the foaming process of the foam body, so that the processing of the installation groove 21 and the installation posts is simple, convenient and efficient. Alternatively, the installation groove 21 and the installation posts are formed on the surface of the foam body after the foam body is processed, which is beneficial to improving the flexibility of the processing of the installation groove 21 and the installation posts, and is also beneficial to reducing the complexity of the foaming mold, thereby reducing the mold development cost.

[0060] In one possible implementation, all the sensors 3 are installed on the same layer of the foam body. For example, all the sensors 3 are installed on the outermost layer of the foam body; or, all the sensors 3 are installed on the middle layer of the foam body. This makes the installation of the sensors 3 more convenient, and moreover, processing the installation groove 21 and / or the installation posts on the same layer of the foam body layer is simple, convenient and efficient.

[0061] In one possible implementation, the sensors 3 are installed on different layers of the foam body, and those skilled in the art set them according to the needs of specific types of sensors. The distances between different sensors and the inner wall of the pipeline to be measured are inconsistent. For example, the distance between the force sensor and the inner wall of the pipeline to be measured can be relatively large to avoid damaging the force sensor due to excessive force; for another example, the distance between the magnetic sensor and the inner wall of the pipeline to be measured can be relatively small to avoid inaccurate detection caused by too large a distance between the magnetic sensor and the inner wall of the pipeline to be measured; for another example, the sensing element of the ultrasonic sensor contacts the inner wall of the pipeline to be measured to avoid the foam body assembly 2 affecting the transmission of sound waves.

[0062] The present invention uses the outer shape dimensions of different layers of the foam body and the installation grooves or installation posts to adjust the spatial distribution positions of the sensors, which can replace the rigid skeleton support and is more likely to pass through some pipelines with larger bending degrees, further reducing the risk of blockage of the pipeline inspection pig.

[0063] It should be noted here that when the sensor 3 is installed inside the foam body assembly 2, that is, when there is still foam body outside the sensor 3, since the temperature of the foaming liquid during the foaming process is between 80 and 100 degrees Celsius, the foaming liquid will not damage the sensor.

[0064] The sensor 3 can be installed at any position of the foam body assembly 2. In a preferred implementation, the radial and axial positions of each sensor 3 on the outermost layer of the foam body are different, that is, all the sensors 3 do not overlap in the radial and axial directions on the outermost layer of the foam body. For example, referring to Figure 3 and Figure 5 , when all the sensors 3 are located in the same circumferential direction of the same layer of the foam body, the multiple sensors 3 are arranged at intervals along the circumferential direction of the foam body to avoid the radial overlap of any two sensors on the outermost layer of the foam body. With such a setting in this embodiment, the accuracy of detection between multiple sensors 3 can be avoided from being affected by each other.

[0065] In addition, in order to further improve the detection accuracy of the sensor 3, when the sensor 3 is arranged on the innermost foam body, the radial distance between the outer surface of the innermost foam body and the inner surface of the pipeline to be measured is 30-40 mm. At this time, the innermost foam body is cylindrical, which is beneficial to improving the detection accuracy of the sensor 3. Those skilled in the art set the outer diameter of the innermost foam body according to the type and sensitivity of the sensor. Of course, the shape of the innermost foam body is not limited to cylindrical, and the cross-section of the innermost foam body can also be triangular, elliptical, irregular, etc.

[0066] Refer to Figures 4 to 6 , in this embodiment, the pig body includes a cavity 11, a first end cover 12 sealingly connected to the first end of the cavity 11, and a second end cover 13 sealingly connected to the second end of the cavity 11. The first end cover 12, the cavity 11, and the second end cover 13 form a sealed installation space, and a controller is arranged in the sealed installation space; a wire passing channel 121 is arranged on the first end cover 12. The first end of the wire 4 is electrically connected to the controller, and the second end of the wire 4 passes through the wire passing channel 121 and is electrically connected to the sensor 3.

[0067] The cavity 11 can be a cylindrical structure, a prismatic structure, etc. Preferably, the cavity 11 is a cylindrical structure. The cavity 11 is a barrel-shaped structure with both ends open, which includes a first end and a second end. The first end of the cavity 11 can be the forward end, that is, the first end of the cavity 11 is the end when the pipeline inspection pig moves forward. At this time, the second end of the cavity 11 is the rear end. Or, the first end of the cavity 11 is the rear end. At this time, the second end of the cavity 11 is the front end, that is, the second end of the cavity 11 is the end when the pipeline inspection pig moves forward. In this embodiment, a filling groove and a wire passing channel 121 are formed on the first end cover 12. At this time, the second end of the cavity 11 is used as the forward end, and the sensor 3 is installed at a position close to the second end of the cavity 11 in the foam assembly 2, which is beneficial to the wiring of the sensor 3 and convenient for the disassembly and assembly of the wire 4.

[0068] The first end of the cavity 11 is sealingly connected to the first end cover 12. For example, the first end of the cavity 11 is flange-connected to the first end cover 12, and a gasket is arranged between the first end of the cavity 11 and the first end cover 12; for another example, the first end of the cavity 11 is thread-connected to the first end cover 12, and a sealing ring is arranged between the first end of the cavity 11 and the first end cover 12.

[0069] The second end of the cavity 11 is sealingly connected to the second end cover 13. For example, the second end of the cavity 11 is flange-connected to the second end cover 13, and a gasket is arranged between the second end of the cavity 11 and the second end cover 13; for another example, the second end of the cavity 11 is thread-connected to the second end cover 13, and a sealing ring is arranged between the second end of the cavity 11 and the second end cover 13.

[0070] In this embodiment, the pig body includes a cavity, a first end cover and a second end cover which are hermetically connected to both ends of the cavity respectively. The first end cover is formed with a filling groove and a wire passing channel, so that the structure of the pig body is simple, which is convenient for installing electronic devices such as a controller and a battery in the accommodating cavity of the pig body.

[0071] Further, the first end cover 12 includes an end cover body 122 and a mounting ring 123 disposed outside the end cover body 122. The wire passing channel 121 is disposed on the end cover body 122 and is located within the mounting ring 123; the mounting ring 123 and a part of the end cover body 122 within the mounting ring 123 form a filling groove; the end cover body 122 is hermetically connected to the cavity 11.

[0072] Wherein, the inner side of the end cover body 122 refers to the side facing the cavity 11, and the outer side of the end cover body 122 refers to the side facing away from the cavity 11. The mounting ring 123 is located outside the end cover body 122, and the mounting ring 123 and the end cover body 122 are an integrally formed one-piece. The mounting ring 123 can be a circular ring, an oval ring, a polygonal ring or an irregular-shaped ring structure, etc. The wire passing channel 121 is disposed on the end cover body 122 and is located within the mounting ring 123. The mounting ring 123 and a part of the end cover body 122 within the mounting ring 123 form a filling groove, and sealant 5 is filled in the filling groove to seal the wire passing channel 121, preventing oil and gas in the oil and gas pipeline from entering the pig body and corroding the electronic devices inside the pig body. This is beneficial to improving the service life of the pipeline inspection pig.

[0073] In one possible implementation, on the outer side of the mounting ring 123, a plurality of first connection holes 125 are disposed on the end cover body 122, and the plurality of first connection holes 125 are circumferentially spaced along the mounting ring 123; a plurality of first threaded holes opposite to the first connection holes 125 are disposed at the first end of the cavity 11; a first sealing ring 82 is disposed between the end cover body 122 and the first end of the cavity 11; the pipeline inspection pig of this embodiment further includes a plurality of first fastening screws 81, and the first fastening screws 81 pass through the first connection holes 125 and are threadedly connected to the first threaded holes.

[0074] The end cover body 122 is of a disc structure, the mounting ring 123 is of a circular ring structure, and the mounting ring 123 and the end cover body 122 are coaxial. On the outer side of the mounting ring 123, a plurality of first connection holes 125 are disposed on the end cover body 122, and the plurality of first connection holes 125 are circumferentially spaced along the mounting ring 123. A wire passing channel 121 is disposed on the inner side of the mounting ring 123.

[0075] The first end of the cavity 11 is provided with a plurality of first threaded holes, and the first threaded holes correspond to the first connecting holes 125 one-to-one, that is, the number of the first threaded holes is the same as that of the first connecting holes 125 , and the positions of the first threaded holes and the first connecting holes 125 are opposite.

[0076] In this embodiment, a first sealing ring 82 is provided between the end cover body 122 and the first end of the cavity 11, and the first fastening screw 81 passes through the first connecting hole 125 and is threadedly connected to the first threaded hole, thereby realizing a sealed connection between the cavity 11 and the first end cover 12, and the connection method is simple and the sealing is reliable.

[0077] Based on the above embodiments, Figure 6 A plurality of wire holes 124 are provided on the mounting ring 123, and the plurality of wire holes 124 are arranged at intervals along the circumference of the mounting ring 123; the pipeline inspection pig of this embodiment further includes at least one wire sealing plug 6, which is installed in the wire hole 124; the wire 4 passes through the wire sealing plug 6 and the wire channel 121 and is electrically connected to the controller.

[0078] The wire holes 124 provided in the mounting ring 123 can be arranged according to the number of sensors 3 and wires 4. The wire holes 124 are evenly spaced along the circumference of the mounting ring 123. The wire holes 124 can be round or T-shaped, and their shape is determined by the structure of the wire sealing plug 6. The wire sealing plug 6 is installed within the wire holes 124, allowing the wires 4 to pass through the wire sealing plug 6 and then through the wire passage 121 to be electrically connected to the controller. The wire sealing plug 6 can be a conventional wire sealing plug structure.

[0079] To facilitate the machining of the wire holes 124, the outer side of the mounting ring 123 is formed into a polygonal surface, with each side being machined with a wire hole 124. Of course, the inner side of the mounting ring 123 can be a circular surface. The outer side of the mounting ring 123 refers to the side facing away from its central axis, while the inner side of the mounting ring 123 refers to the side facing toward its central axis.

[0080] In this embodiment, the pipeline inspection pig features multiple wire holes in the mounting ring, allowing the wires to pass through the holes and into the wire passageway. This prevents damage to the wires from friction with the mounting ring when the wires enter the passageway directly. Furthermore, the wires are installed in the wire holes using wire sealing plugs, further improving the sealing performance of the wires.

[0081] In addition, in order to prevent the foam assembly 2 from foaming, the length of the foam closest to the pipe cleaner body can be slightly larger than the length of the cavity 11, but the first end cover 12 should be exposed to the outside of the foam assembly 2 to provide convenience and space for the arrangement of the sensor 3 and the wire 4.

[0082] Continue to refer toFigure 4 In this embodiment, the pipeline inspection pig further includes an electrical connector 7 installed in the wire passing channel 121. The wire 4 is electrically connected to the controller through the electrical connector 7. Among them, the electrical connector 7 can be an existing electrical connector structure such as an aviation plug, and the shape of the wire passing channel 121 is set according to the structure of the selected electrical connector 7.

[0083] In this embodiment, by arranging an electrical connector in the wire passing channel and electrically connecting the wire to the controller through the electrical connector, it is beneficial to seal the wire passing channel and also convenient for the disassembly and insertion of the wire and the sensor.

[0084] In one possible implementation manner, continue to refer to Figure 4 , a groove is formed by the outer end surface of the end cap body 122 recessing towards the second end cap 13, and the groove is opposite to the mounting ring 123; the wire passing channel 121 is located at the bottom wall of the groove. In this way, the mounting ring 123 and the groove form a filling groove, which is beneficial to increasing the volume of the filling groove to fill more sealant 5 and further improving the sealing performance of the wire passing channel 121.

[0085] Continue to refer to Figure 4 , the second end cap 13 is of a disc structure, and a plurality of second connection holes are provided on the second end cap 13, and the plurality of second connection holes are arranged at intervals along the circumferential direction of the second end cap 13; a plurality of second threaded holes opposite to the second connection holes are provided at the second end of the cavity 11; a second sealing ring 92 is provided between the second end cap 13 and the first end of the cavity 11; the pipeline inspection pig of this embodiment further includes a plurality of second fastening screws 91, and the second fastening screws 91 pass through the second connection holes and are threadedly connected to the second threaded holes.

[0086] The second end cap 13 is of a disc structure, and a plurality of second connection holes are provided at the edge of the second end cap 13, and the plurality of second connection holes are arranged at intervals along the circumferential direction of the second end cap 13. A plurality of second threaded holes are provided at the second end of the cavity 11, and the second threaded holes correspond to the second connection holes one by one, that is, the number of the second threaded holes is the same as that of the second connection holes, and the positions of the second threaded holes and the second connection holes are opposite.

[0087] In this embodiment, a second sealing ring 92 is provided between the second end cap 13 and the second end of the cavity 11, and the second fastening screws 91 pass through the second connection holes and are threadedly connected to the second threaded holes, so as to realize the sealed connection between the cavity 11 and the second end cap 13, and the connection method is simple and the sealing is reliable.

[0088] Furthermore, a traction pull ring 131 is provided on the second end cap 13 for pulling the pipeline inspection pig. The traction pull ring 131 can be welded to the second end cap 13, or the second end cap 13 is provided with a threaded hole, and the traction pull ring 131 is provided with a stud threadedly connected to the threaded hole, that is, the traction pull ring 131 can also be threadedly connected to the second end cap 13.

[0089] In one possible implementation, a guiding inclined surface 22 is provided at the front end of the foam body assembly 2. Specifically referring to Figure 1 , inclined surfaces are provided at the front ends of each layer of the foam body, and the inclined angles of the inclined surfaces of each layer of the foam body are the same. The inclined surfaces of all layers of the foam body form a conical surface, that is, the guiding inclined surface 22, which is beneficial to the advancement of the pipeline inspection pig. The inclined angle of the guiding inclined surface 22 can be 30 degrees, 45 degrees, etc., and those skilled in the art can set it according to the actual situation.

[0090] The foam body assembly 2 includes at least two layers of foam bodies. Referring to Figure 7 and Figure 8 , there are various processing methods for the single-layer foam body 23 of the foam body assembly 2.

[0091] For example, referring to Figure 7 , the single-layer foam body 23 includes two sub-foam bodies, that is, a first sub-foam body 231 and a second sub-foam body 232. The first sub-foam body 231 and the second sub-foam body 232 enclose to form a circular single-layer foam body 23, and the end faces of the first sub-foam body 231 and the second sub-foam body 232 are provided with concave-convex structures, which are convenient for the assembly and positioning of the first sub-foam body 231 and the second sub-foam body 232.

[0092] When the first sub-foam body 231 foams, a wedge member 20 can be provided inside it to accelerate the solidification and molding of the foaming liquid of the first sub-foam body 231, and it is also beneficial to prevent the rotation between adjacent layers of the single-layer foam bodies 23. The cross-section of the wedge member 20 can be circular, elliptical, polygonal or irregular, etc. Two, three or four or more wedge members 20 can be provided, and the multiple wedge members 20 can be provided at any position of the first sub-foam body 231. For example, the multiple wedge members 20 are arranged at intervals along the circumference of the semi-circular ring-shaped first sub-foam body 231.

[0093] When the second sub-foam body 232 foams, a wedge member 20 can be provided inside it to accelerate the solidification and molding of the foaming liquid of the second sub-foam body 232, and it is also beneficial to prevent the rotation between the adjacent single-layer foam bodies 23 of two layers. Among them, the cross-section of the wedge member 20 can be circular, elliptical, polygonal or irregular, etc. Two, three or four or more wedge members 20 can be provided, and the multiple wedge members 20 can be arranged at any position of the second sub-foam body 232. For example, the multiple wedge members 20 are arranged at intervals along the circumferential direction of the semi-circular ring-shaped second sub-foam body 232.

[0094] For another example, referring to Figure 8 , the single-layer foam body 23 is of an annular structure, and a wedge member 20 can be provided inside it to accelerate the solidification and molding of the foaming liquid of the single-layer foam body 23, and it is also beneficial to prevent the rotation between the adjacent single-layer foam bodies 23 of two layers.

[0095] It should be noted here that in the structure of the single-layer foam body 23 shown in Figure 7 and Figure 8 , the sensor 3 can be installed in the single-layer foam body 23, and the sensor 3 can also be installed in the wedge member 20. In this way, it is beneficial to improve the flexibility of the installation of the sensor 30.

[0096] Moreover, the wedge member 20 can be at least one of a polystyrene foam body, a polyurethane foam body, a polyvinyl chloride foam body, a polyethylene foam body, a urea-formaldehyde foam body, and a phenolic foam body, and the wedge member 20 can also be made of other materials.

[0097] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0098] In the above description, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipeline inspection pig, characterized in that, Including: A pig body and a foam component arranged outside the pig body; The pig body includes a cavity, a first end cap sealingly connected to the first end of the cavity, and a second end cap sealingly connected to the second end of the cavity. The first end cap includes an end cap body and a mounting ring arranged outside the end cap body. A plurality of wire passing holes are arranged on the mounting ring, and the plurality of wire passing holes are arranged at intervals along the circumferential direction of the mounting ring. The outer side surface of the mounting ring forms a polygonal side surface, and one wire passing hole is processed on each side surface; The foam component includes at least two layers of foams sleeved in sequence, and at least one of the foams is different from the other foams in material and / or density; The outermost layer of foam is in interference fit with the pipeline to be detected; The pipeline detection pig further includes a plurality of sensors; The radial and axial positions of each sensor are different on the outermost layer of foam; A single layer of foam includes two sub-foams, namely a first sub-foam and a second sub-foam. The first sub-foam and the second sub-foam enclose to form a circular single layer of foam, and the end surfaces of the first sub-foam and the second sub-foam are provided with concave-convex structures; A wedge is arranged inside the foam, and the wedge is used to accelerate the solidification and molding of the foaming liquid of the single layer of foam and prevent the rotation between adjacent single layers of foam; The sensor is installed on the foam or the wedge; 2. The pipeline inspection pig according to claim 1, characterized in that, All the sensors are installed on the same layer of foam; Or, the sensors are installed on different layers of foam; 3. The pipeline inspection pig according to claim 2, wherein, The foam is provided with mounting grooves and / or mounting posts for mounting the sensors; 4. The pipeline inspection pig according to claim 2, wherein, The sensor is one or more of the following sensors: a deformation sensor, a force sensor, an image sensor, a sound sensor, a magnetic sensor, a position sensor, an optical sensor, a pipe diameter measurement sensor; 5. The pipeline inspection pig according to any one of claims 1-4, characterized in that, The first end cap, the cavity and the second end cap form a sealed installation space, and a controller is arranged in the sealed installation space; A wire passing channel is arranged on the first end cap. The first end of the wire is electrically connected to the controller, and the second end of the wire passes through the wire passing channel and is electrically connected to the sensor; 6. The pipeline inspection pig according to claim 5, characterized in that, An electrical connector is installed in the wire passing channel, and the first end of the wire is electrically connected to the controller through the electrical connector; 7. The pipeline inspection pig according to any one of claims 1-4, characterized in that, Adjacent two layers of foam are connected together by a foaming process, or adjacent two layers of foam are bonded together; 8. The pipeline inspection pig according to any one of claims 1-4, characterized in that, The outer diameter of the outermost layer of foam is 101%-120% of the inner diameter of the pipeline to be detected; And / or, the innermost layer of foam is cylindrical, and the radial distance between the outer surface of the innermost layer of foam and the inner surface of the pipeline to be detected is 30-40mm; 9. The pipeline inspection pig according to any one of claims 1-4, characterized in that, A guiding inclined surface is arranged at the front end of the foam component;

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