A pipeline inspection gauge for use in oil pipelines

Abstract

The application relates to the field of oil pipeline detection, and discloses a pipeline detector for an oil pipeline, which comprises a connecting pipeline, oil pipelines connected to the two ends of the connecting pipeline, a branch pipeline installed at the highest point of the outer circumferential surface of the connecting pipeline, a gate valve installed at the upper end of the branch pipeline, an outer cover shell arranged on the upper surface of the gate valve, a winding and unwinding assembly, a detection assembly and a connecting rope for connecting the two arranged in the outer cover shell; in the case, the center line of the traveling wheel and the axis line of the oil pipeline are arranged at an included angle, when the electromagnet is electrified and the detection assembly is magnetically attached to the inner wall of the oil pipeline or the connecting pipeline, and the traveling wheel rotates, the detection assembly moves in a spiral track, the projection distance of the detection range of the detection component on the axis line of the oil pipeline is greater than the pitch of the spiral track of the detection assembly, therefore, the oil pipeline inner wall can be comprehensively and dead-angle-free detected.

Description

Technical Field

[0001] This invention relates to the field of oil pipeline inspection, specifically to the field of oil pipeline inner wall inspection, and particularly to an internal pipeline detector for oil pipelines. Background Technology

[0002] As the primary carriers of oil and other energy resources, the safe operation of oil pipelines is directly related to energy supply, environmental protection, and public safety. Pipeline failures are typically caused by a combination of factors, with corrosion being one of the most significant. The media transported in pipelines often contain corrosive components such as water, hydrogen sulfide, carbon dioxide, and microorganisms, which can cause uniform corrosion, pitting, and even stress corrosion cracking of the pipe walls over long-term operation. Statistics show that pipeline leaks caused by corrosion failure occur frequently, leading to oil and gas leaks, environmental pollution, and even casualties, severely impacting enterprise production, safety, environmental protection, and public image.

[0003] To ensure the safe operation of oil pipelines, internal pipeline inspection is essential. Internal pipeline inspection refers to the process of using the pipeline medium to drive a detector inside the pipeline, detecting and recording damage such as deformation and corrosion in real time, and accurately locating the damage. It is currently recognized as the most effective method for inspecting in-service pipelines.

[0004] For example, Chinese invention patent with authorization announcement number CN120314193B discloses a corrosion monitoring device and method for oil pipelines. It discloses a technology that uses the flow of oil and gas medium in conjunction with the winding and unwinding of a traction rope to move the detection component inside the oil pipeline, thereby enabling the detection of the inside of the oil pipeline through the detection component.

[0005] Chinese invention patent application CN113048329A discloses a piezoelectric ultrasonic testing probe section for oil pipelines and an in-pipe detector. It directly inserts the detector into the upstream oil pipeline. Driven by the flow of oil and gas medium in the oil pipeline, the detector moves in the oil pipeline. During the movement, it detects the inner wall of the oil pipeline and stores the detection data. When the detector moves into the downstream oil pipeline, the detector is removed and the stored data is read to obtain the detection result of the inner wall of the oil pipeline.

[0006] Both of the aforementioned detection methods have shortcomings. Specifically, they both achieve axial movement within the pipeline by being propelled by the oil and gas medium. On the one hand, the flow velocity of the oil and gas medium fluctuates, and the detector either floats in the oil and gas medium or sinks to the bottom. Therefore, the axial movement of the detector within the pipeline results in radial swaying and circumferential deflection, which negatively impacts the accuracy of the detection results. On the other hand, if the detector's offset is too large, it can easily cause collision damage to the detector and the inner wall of the pipeline.

[0007] Based on the above, the present invention proposes an in-pipe detector for oil pipelines. Summary of the Invention

[0008] To address the problems mentioned in the background above, the present invention provides an in-pipe detector for oil pipelines.

[0009] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0010] An internal detector for oil pipelines includes a connecting pipe, both ends of which are connected to oil pipelines. A branch pipe is installed at the highest point of the outer surface of the connecting pipe, and a gate valve is installed at the upper end of the branch pipe. An outer cover is provided on the upper surface of the gate valve, and a take-up and release assembly, a detection assembly, and a connecting rope for connecting the two are provided inside the outer cover.

[0011] A detection method for an in-pipe detector used in oil pipelines:

[0012] S1: The detection component includes a housing. The housing has a traveling component and a detection component on its two large surfaces. The large surface refers to the side of the housing with the largest area. There are two large surfaces, and two traveling components and two detection components are provided respectively.

[0013] The traveling component includes four traveling units, and the housing is rectangular. The four traveling units are located near the four right angles of the housing.

[0014] The large surface of the casing has an installation port, and a sealing shell is provided at the opening facing the hole inside the casing.

[0015] The traveling unit includes a traveling wheel installed inside a sealed housing, with a portion of the traveling wheel extending out of the sealed housing through the mounting opening. The interior of the traveling wheel is hollow and equipped with an electromagnet. The input end of the traveling wheel extends into the housing and is powered by a motor b.

[0016] When the gate valve opens, the rope release mechanism releases the rope, and the detection component passes through the gate valve and enters the connecting pipe. At the same time, the electromagnet is energized, causing the detection component to be magnetically attracted to the inner wall of the oil pipeline.

[0017] S2: The traveling wheel rotates, carrying the detection component to move inside the oil pipeline, and works with the detection components to detect the inner wall of the oil pipeline;

[0018] S3: After the test is completed, the retraction component retracts the rope, pulling the test component back into the outer casing.

[0019] Furthermore, S3 includes the following steps:

[0020] S301: The centerline of the traveling wheel is arranged at an angle to the axis of the oil pipeline. When the electromagnet is energized, the detection component is magnetically attracted to the inner wall of the oil pipeline or connecting pipeline, and the traveling wheel rotates, the detection component moves in a spiral trajectory. The projection distance of the detection range of the detection component on the axis of the oil pipeline is greater than the pitch of the spiral trajectory of the detection component.

[0021] When the electromagnet is de-energized, the detection component sinks to the bottom under the action of gravity, that is, the detection component sinks to the bottom of the inner wall of the oil pipeline.

[0022] S302: When the electromagnet is energized, the moving component pulls the detection assembly to move, thereby positioning the detection assembly at the highest point of the outer surface of the oil pipeline.

[0023] S303: The electromagnet remains energized, the detection component stops moving, the retraction component retracts the rope, thereby pulling the detection component back. When the detection component approaches the branch pipe, the electromagnet is de-energized, and finally the detection component passes through the gate valve and returns to the outer casing.

[0024] Furthermore, the detection component includes pump b and a support set on the inner side of the large surface of the housing. The support is hollow inside, and the large surface of the housing is also provided with a clearance opening communicating with the support. A groove cover is provided at the end opening of the support.

[0025] The support is fitted with a movable plug and a spring is provided between them. The spring force is used to make the movable plug move closer to the groove cover.

[0026] The input end of pump b is connected to the input hole located on the side of the casing, and the output end of pump b is connected to the output hole located on the tank cover.

[0027] The tank cover is connected to the oil drain hole located on the side of the machine housing via an oil drain pipe, and a connecting valve is provided at the connection between the oil drain pipe and the oil drain hole.

[0028] The movable plug is transparent and hollow inside, and is equipped with a detection element.

[0029] Furthermore, the gate valve includes a fixed seat disposed between the branch pipe and the outer casing, the upper surface of the fixed seat is provided with a groove, and the bottom of the groove is provided with an inlet and outlet.

[0030] A gate is slidably installed in the chute. The gate is connected to a linear module a set on the outer surface of the fixed base. The fixed base is provided with a clearance hole for avoiding the linear module a.

[0031] When the gate is moved by the linear module a, it can block or open the inlet and outlet.

[0032] Furthermore, a reflux assembly is installed on one side of the outer casing, which is used to pull the oil and gas medium inside the outer casing back to the oil pipeline.

[0033] Furthermore, the reflux assembly includes pump a, the input end of pump a is connected to the outer casing through an oil inlet pipe, and the output end of pump a is connected to the branch pipe through an oil outlet pipe.

[0034] Furthermore, the outer surface of the outer casing is provided with a side notch, and a cover can be detachably installed at the opening of the side notch.

[0035] Furthermore, the take-up and release assembly includes a support body disposed inside the outer casing, on which a take-up and release shaft, a motor a for driving the take-up and release shaft to rotate, a rope frame located on one side of the take-up and release shaft, and a linear module b for driving the rope frame to move along the axis of the take-up and release shaft.

[0036] Both the support body and the rope frame are equipped with pulleys. One end of the connecting rope is wound around the take-up and release shaft, and the other end passes through multiple pulleys before being connected to the detection component.

[0037] Initially, the centerline of the detection component located inside the outer casing coincides with the centerline of the inlet and outlet.

[0038] Compared with the prior art, the beneficial effects of this invention are as follows:

[0039] Technical effect 1: In this case, the center line of the traveling wheel and the axis of the oil pipeline are arranged at an angle. When the electromagnet is energized, the detection component is magnetically attracted to the inner wall of the oil pipeline or connecting pipe. When the traveling wheel rotates, the detection component moves in a spiral trajectory. The projection distance of the detection range of the detection component on the axis of the oil pipeline is greater than the pitch of the spiral trajectory of the detection component. Therefore, it is possible to achieve comprehensive and blind-spot-free detection of the inner wall of the oil pipeline.

[0040] Furthermore, during the detection process, the distance between the detection element and the inner wall of the oil pipeline remains consistent, thus solving the problems mentioned in the background technology that the detection action is easily affected by detector shaking and displacement and is prone to collision damage.

[0041] Furthermore, when the traveling wheel reverses direction, the detection components move in a spiral trajectory, but in opposite directions. In other words, in this case, the detection components can detect both upstream and downstream, and the detection range is twice the length of the connecting rope, making the detection range wider.

[0042] Technical effect 2: In this case, both sides of the casing are provided with traveling components and detection components. Therefore, regardless of the flow rate of the oil and gas medium in the oil pipeline, the detection components in this application can be located on the inner wall of the oil pipeline and the initial position is close to the center line of the branch pipe. Combined with forward and reverse flow detection, the detection is thorough.

[0043] Technical effect 3: The detection elements generally use technologies such as camera elements, 3D scanning elements, and ultrasonic probe elements. These technologies are all high-precision electronic components. When using them, attention should be paid to the collision problem. If they collide with the inner wall of the oil pipeline, not only will the detection elements be easily damaged, but the oil pipeline will also be easily damaged.

[0044] In this application, referring to steps four to six, during the reset process of the detection component, the power is first cut off to allow the detection component to sink to the bottom and confirm its position. Then, the power is turned on to pull the detection component to move. Therefore, the detection component can be positioned at the highest point of the inner wall of the oil pipeline. Finally, the detection component is reset by pulling the rope of the release and retraction component. Its technical advantage is that during the reset process, the angle between the connecting rope and the axis of the oil pipeline is very small, and the component of the traction force of the connecting rope on the axis of the oil pipeline is at its maximum value. That is to say, the traction force acting on the detection component is at its maximum value. This can effectively prevent the radial component of the traction force of the connecting rope from being too large during the reset process, thus overcoming the magnetic attraction force and causing the detection component to detach and easily collide with the oil pipeline.

[0045] Conversely, for example, if the detection component sinks to the bottom and is pulled back by the connecting rope, then because the radial component of the connecting rope's traction force is at its maximum at this time, it is easy to overcome the magnetic attraction force and cause the connecting component to detach from the magnetic attraction force between it and the oil pipeline. In the process of pulling back, the detection component is likely to collide with the inner wall of the oil pipeline. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the present invention;

[0047] Figure 2 This is a cross-sectional view of the present invention before inspection.

[0048] Figure 3 A cross-sectional view of the present invention during the testing process;

[0049] Figure 4 This is a schematic diagram of a gate valve;

[0050] Figure 5 This is a schematic diagram of the retractable components;

[0051] Figure 6 This is a schematic diagram of the detection component;

[0052] Figure 7 A top view of the detection component;

[0053] Figure 8 A cross-sectional view of the inspection component;

[0054] Figure 9 An exploded view of the detection components;

[0055] Figure 10 This is a schematic diagram of the traveling component.

[0056] The labels in the attached diagram are:

[0057] 100. Oil pipeline; 200. Connecting pipeline; 201. Branch pipe; 202. Outer casing; 203. Gate valve; 2031. Mounting base; 2032. Slide groove; 2033. Inlet / outlet; 2034. Clearance hole; 2035. Gate plate; 2036. Linear module a; 204. Return assembly; 2041. Cover; 2042. Pump a; 2043. Oil inlet pipe; 2044. Oil outlet pipe; 205. Retractable assembly; 2051. Retractable shaft; 2052. Motor a; 2053. Rope frame; 2054, linear module b; 2055, pulley; 206, connecting rope; 207, detection component; 208, housing; 2081, support; 2082, clearance opening; 2083, trough cover; 209, traveling component; 2091, motor b; 2092, power transmission component; 2093, traveling wheel; 2094, electromagnet; 210, detection component; 2101, movable plug; 2102, spring; 2103, pump b; 2104, oil drain pipe; 2105, connecting valve. Detailed Implementation

[0058] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0059] Reference Figures 1-3 An internal detector for an oil pipeline includes a connecting pipe 200, with oil pipelines 100 connected to both ends of the connecting pipe 200. A branch pipe 201 is installed at the highest point of the outer surface of the connecting pipe 200. A gate valve 203 is installed at the upper end of the branch pipe 201. An outer cover 202 is provided on the upper surface of the gate valve 203. A take-up and release assembly 205, a detection assembly 207, and a connecting rope 206 for connecting the two are provided inside the outer cover 202.

[0060] When in use, the gate valve 203 is opened, the rope release component 205 releases the rope, and under the action of gravity, the detection component 207 moves down into the connecting pipe 200. Then the detection component 207 is magnetically adsorbed on the inner wall of the pipe and moves in a spiral trajectory. While moving, the detection of the inner wall of the pipe is realized.

[0061] After the test is completed, the test component 207 is pulled back into the outer casing 202 by the cooperation of the retraction component 205 and the connecting rope 206, and the gate valve 203 is closed.

[0062] Preferably, after the detection component 207 returns to the outer casing 202, the outer casing 202 is filled with oil and gas medium. Therefore, a return component 204 can be provided on one side of the outer casing 202 to pull the oil and gas medium back to the oil pipeline 100.

[0063] Gate valve 203:

[0064] Reference Figure 4 The gate valve 203 includes a fixed seat 2031 disposed between the branch pipe 201 and the outer casing 202. The upper surface of the fixed seat 2031 is provided with a sliding groove 2032, and the bottom of the sliding groove 2032 is provided with an inlet and outlet 2033.

[0065] A gate 2035 is slidably installed in the slide 2032. The gate 2035 is connected to the linear module a2036 set on the outer surface of the fixed base 2031. The fixed base 2031 is provided with a clearance hole 2034 for avoiding the linear module a2036. The linear modules mentioned in this case can all be realized by existing lead screw linear movement technology, which will not be elaborated further.

[0066] When the gate 2035 moves, it can block or open the inlet / outlet 2033.

[0067] Reflux component 204:

[0068] Reference Figure 2 The return flow assembly 204 includes a pump a2042. The input end of the pump a2042 is connected to the outer casing 202 through an oil inlet pipe 2043, and the output end of the pump a2042 is connected to the branch pipe 201 through an oil outlet pipe 2044.

[0069] Furthermore, the outer surface of the outer casing 202 is provided with a side notch, and a cover 2041 can be detachably installed at the opening of the side notch.

[0070] Pump a2042 can pull the oil and gas medium inside the outer casing 202 back into the oil pipeline 100.

[0071] The cover 2041 is designed to allow opening of the side notch and removal of the inspection component 207 for maintenance.

[0072] Retractable / expandable component 205:

[0073] Reference Figure 5 The take-up and take-down assembly 205 includes a support body disposed inside the outer casing 202. The support body is equipped with a take-up and take-down shaft 2051, a motor a2052 for driving the take-up and take-down shaft 2051 to rotate, a rope frame 2053 located on one side of the take-up and take-down shaft 2051, and a linear module b2054 for driving the rope frame 2053 to move along the axis of the take-up and take-down shaft 2051.

[0074] Both the support body and the rope frame 2053 are equipped with pulleys 2055. One end of the connecting rope 206 is wound around the take-up and release shaft 2051, and the other end passes through multiple pulleys 2055 and is connected to the detection component 207. Furthermore, initially, the center line of the detection component 207 located inside the outer cover 202 coincides with the center line of the inlet and outlet 2033.

[0075] Therefore, when the take-up and release shaft 2051 rotates to release the rope, under the action of gravity, the detection component 207 can pass through the inlet and outlet 2033 and enter the connecting pipe 200.

[0076] Furthermore, when the take-up and release shaft 2051 rotates to take up and release the rope, the rope frame 2053 moves axially accordingly. The purpose of this is to ensure that the connecting rope 206 is wound in an orderly manner on the take-up and release shaft 2051.

[0077] Furthermore, the take-up and release shaft 2051 is movably connected to the detection component 207, and the interior of the take-up and release shaft 2051 is hollow. A wire is installed inside the take-up and release shaft 2051, and the end of the wire is installed inside the detection component 207 through a rotary joint and is connected to the relevant electronic components inside the detection component 207 to achieve the purpose of powering the detection component 207. The power supply can be installed inside the outer casing 202.

[0078] Detection component 207:

[0079] Reference Figure 6 The detection component 207 includes a housing 208. A traveling component 209 and a detection component 210 are provided on both large surfaces of the housing 208. The large surface refers to the side of the housing 208 with the largest area. There are two large surfaces, and two traveling components 209 and two detection components 210 are provided respectively.

[0080] Reference Figure 7 and Figure 10 The traveling component 209 includes four traveling units. The housing 208 is rectangular, and the four traveling units are located near the four right angles of the housing 208.

[0081] The large surface of the housing 208 is provided with an installation port, and a sealing shell is provided at the opening facing the hole inside the housing 208.

[0082] The traveling unit includes a traveling wheel 2093 installed in a sealed housing, with the traveling wheel 2093 partially extending out of the sealed housing through the mounting opening. The input end of the traveling wheel 2093 extends into the housing 208 and is connected to the motor b2091 installed in the housing 208 via a power transmission component 2092.

[0083] The interior of the traveling wheel 2093 is hollow and equipped with an electromagnet 2094.

[0084] Furthermore, the centerline of the traveling wheel 2093 is arranged at an angle to the axis of the oil pipeline 100. When the electromagnet 2094 is energized, the detection component 207 is magnetically attracted to the inner wall of the oil pipeline 100 or the connecting pipe 200. When the traveling wheel 2093 rotates, the detection component 207 moves in a spiral trajectory. The projection distance of the detection range of the detection component 210 on the axis of the oil pipeline 100 is greater than the pitch of the spiral trajectory of the detection component 207, thereby achieving comprehensive and blind-spot-free detection of the inner wall of the oil pipeline 100.

[0085] Furthermore, when the traveling wheel 2093 rotates in both directions, the detection component 207 moves along a spiral trajectory, but in opposite directions. In other words, in this case, the detection component 207 can detect both upstream and downstream, thus expanding the detection range.

[0086] Reference Figure 8 and Figure 9 The detection component 210 includes a pump b2103 and a support 2081 disposed on the inner side of the large surface of the housing 208. The support 2081 is hollow inside. The large surface of the housing 208 is also provided with a clearance opening 2082 communicating with the support 2081. A groove cover 2083 is provided at the end opening of the support 2081.

[0087] The support 2081 is fitted with a movable plug 2101 and a spring 2102 is provided between the two. The elastic force of the spring 2102 is used to make the movable plug 2101 move closer to the groove cover 2083.

[0088] The input end of pump b2103 is connected to the input hole provided on the side of housing 208, and the output end of pump b2103 is connected to the output hole provided on tank cover 2083. Pump b2103 can draw the oil and gas medium in oil pipeline 100 into support 2081, and push the movable plug 2101 to move away from tank cover 2083, so that the arc-shaped end of movable plug 2101 can fit against the inner wall of oil pipeline 100.

[0089] The tank cover 2083 is connected to the oil drain hole on the side of the housing 208 via an oil drain pipe 2104. A connecting valve 2105 is provided at the connection between the oil drain pipe 2104 and the oil drain hole. When the connecting valve 2105 is opened, the spring 2102 releases its elastic force, and the oil and gas medium in the support 2081 returns to the oil supply pipeline 100 through the oil drain pipe 2104. The movable plug 2101 moves closer to the tank cover 2083 and resets.

[0090] Furthermore, the movable plug 2101 is hollow and transparent inside, and a detection element is installed inside. The detection element can be implemented using existing pipeline detection technology, which will not be elaborated further.

[0091] Working principle of the invention:

[0092] (a) Testing phase;

[0093] Step 1: Gate valve 203 opens, rope release component 205 releases rope, and detection component 207 passes through inlet / outlet 2033 and enters connecting pipe 200;

[0094] Step 2: If the flow velocity of the oil and gas medium in the oil pipeline 100 is relatively fast, for example, the flow velocity of the crude oil long-distance pipeline is 2.0 m / s, then after the detection component 207 passes through the branch pipe 201, the rope release action slows down. Under the push of the flowing oil and gas medium, the detection component 207 approaches the upper side of the outer circle surface of the connecting pipe 200. At the same time, the electromagnet 2094 is energized, so that the detection component 207 can be located on the inner wall of the oil pipeline 100.

[0095] If the flow velocity of the oil and gas medium in the oil pipeline 100 is slow, for example, the flow velocity of crude oil pipeline inside the oil field is 0.3-1.0 m / s, then the detection component 207 continues to move down after passing through the branch pipe 201 and approaches the lowest point of the outer circle surface of the connecting pipe 200. At the same time, the electromagnet 2094 is energized, so that the detection component 207 can be located on the inner wall of the oil pipeline 100.

[0096] In other words, regardless of the flow rate of the oil and gas medium in the oil pipeline 100, the detection component 207 in this application can be located on the inner wall of the oil pipeline 100 and its initial position is close to the center line of the branch pipe 201.

[0097] Step 3: The traveling component 209 pulls the detection component 207 to move along a spiral trajectory on the inner wall of the oil pipeline 100, and at the same time, in conjunction with the detection element, the inner wall of the oil pipeline 100 is detected.

[0098] If a defect is detected at a certain point in the oil pipeline 100, then the movement is stopped, and the movable plug 2101 is driven by the pump b2103 to fit against the inner wall of the oil pipeline 100 at a closer distance, so as to conduct a second inspection at the defect point and prevent misjudgment.

[0099] (ii) The reset phase of the detection component 207 after the detection is completed;

[0100] Step 4: When the electromagnet 2094 is de-energized, under the action of gravity, the detection component 207 sinks to the bottom, that is, the detection component 207 sinks to the bottom of the inner wall of the oil pipeline 100.

[0101] Step 5: When the electromagnet 2094 is energized, the traveling component 209 pulls the detection component 207 to move, thereby positioning the detection component 207 at the highest point of the outer surface of the oil pipeline 100;

[0102] Step Six: Electromagnet 2094 remains energized, detection component 207 stops moving, retraction component 205 retracts the rope, thereby pulling detection component 207 back. When detection component 207 approaches branch pipe 201, electromagnet 2094 is de-energized, and finally detection component 207 passes through inlet / outlet 2033 and returns to outer casing 202.

[0103] The technical advantages of this application are:

[0104] Technical effect 1: In this case, the center line of the traveling wheel and the axis of the oil pipeline are arranged at an angle. When the electromagnet is energized, the detection component is magnetically attracted to the inner wall of the oil pipeline or connecting pipe. When the traveling wheel rotates, the detection component moves in a spiral trajectory. The projection distance of the detection range of the detection component on the axis of the oil pipeline is greater than the pitch of the spiral trajectory of the detection component. Therefore, it is possible to achieve comprehensive and blind-spot-free detection of the inner wall of the oil pipeline.

[0105] Furthermore, during the detection process, the distance between the detection element and the inner wall of the oil pipeline remains consistent, thus solving the problem mentioned in the background technology that the detection action is easily affected by detector shaking and displacement.

[0106] Furthermore, when the traveling wheel reverses direction, the detection components move in a spiral trajectory, but in opposite directions. In other words, in this case, the detection components can detect both upstream and downstream, and the detection range is twice the length of the connecting rope, making the detection range wider.

[0107] Technical effect 2: In this case, both sides of the casing are provided with traveling components and detection components. Therefore, regardless of the flow rate of the oil and gas medium in the oil pipeline, the detection components in this application can be located on the inner wall of the oil pipeline and the initial position is close to the center line of the branch pipe. Combined with forward and reverse flow detection, the detection is thorough.

[0108] Technical effect 3: The detection elements generally use technologies such as camera elements, 3D scanning elements, and ultrasonic probe elements. These technologies are all high-precision electronic components. When using them, attention should be paid to the collision problem. If they collide with the inner wall of the oil pipeline, not only will the detection elements be easily damaged, but the oil pipeline will also be easily damaged.

[0109] In this application, referring to steps four to six, during the reset process of the detection component, the power is first cut off to allow the detection component to sink to the bottom and confirm its position. Then, the power is turned on to pull the detection component to move. Therefore, the detection component can be positioned at the highest point of the inner wall of the oil pipeline. Finally, the detection component is reset by pulling the rope of the release and retraction component. Its technical advantage is that during the reset process, the angle between the connecting rope and the axis of the oil pipeline is very small, and the component of the traction force of the connecting rope on the axis of the oil pipeline is at its maximum value. That is to say, the traction force acting on the detection component is at its maximum value. This can effectively prevent the radial component of the traction force of the connecting rope from being too large during the reset process, thus overcoming the magnetic attraction force and causing the detection component to detach and easily collide with the oil pipeline.

[0110] Conversely, for example, if the detection component sinks to the bottom and is pulled back by the connecting rope, then because the radial component of the connecting rope's traction force is at its maximum at this time, it is easy to overcome the magnetic attraction force and cause the connecting component to detach from the magnetic attraction force between it and the oil pipeline. In the process of pulling back, the detection component is likely to collide with the inner wall of the oil pipeline.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pipeline detector for oil pipelines, characterized in that, It includes a connecting pipe (200), both ends of which are connected to oil pipelines (100). A branch pipe (201) is installed at the highest point of the outer circle of the connecting pipe (200). A gate valve (203) is installed at the upper end of the branch pipe (201). An outer cover (202) is provided on the upper surface of the gate valve (203). Inside the outer cover (202) are a take-up and release assembly (205), a detection assembly (207), and a connecting rope (206) for connecting the two.

2. A detection method for an in-pipe detector used in oil pipelines, characterized in that, Includes the following steps: S1: The detection component (207) includes a housing (208). A traveling component (209) and a detection component (210) are provided on both large surfaces of the housing (208). The large surface refers to the side with the largest area of ​​the housing (208). There are two large surfaces, and two traveling components (209) and two detection components (210) are provided respectively. The traveling component (209) includes four traveling units, and the housing (208) is rectangular. The four traveling units are located near the four right angles of the housing (208). The large surface of the housing (208) is provided with an installation port, and a sealing shell is provided at the opening facing the hole inside the housing (208); The traveling unit includes a traveling wheel (2093) installed in a sealed housing, and the traveling wheel (2093) partially extends out of the sealed housing through the mounting port. The interior of the traveling wheel (2093) is hollow and equipped with an electromagnet (2094). The input end of the traveling wheel (2093) extends into the housing (208) and is powered by a motor b (2091). When the gate valve (203) is opened, the rope release component (205) releases the rope, and the detection component (207) passes through the gate valve (203) and enters the connecting pipe (200). At the same time, the electromagnet (2094) is energized, so that the detection component (207) is magnetically attracted to the inner wall of the oil pipeline (100). S2: The traveling wheel (2093) rotates, carrying the detection component (207) to move inside the oil pipeline (100), and cooperates with the detection component (210) to realize the detection of the inner wall of the oil pipeline (100); S3: After the test is completed, the retraction component (205) retracts the rope, pulling the test component (207) back into the outer casing (202).

3. The detection method for an in-pipe detector for oil pipelines according to claim 2, characterized in that, S3 includes the following steps: S301: The centerline of the traveling wheel (2093) is arranged at an angle with the axis of the oil pipeline (100). When the electromagnet (2094) is energized, the detection component (207) is magnetically attracted to the inner wall of the oil pipeline (100) or the connecting pipe (200), and the traveling wheel (2093) rotates, the detection component (207) moves in a spiral trajectory. The projection distance of the detection range of the detection component (210) on the axis of the oil pipeline (100) is greater than the pitch of the spiral trajectory of the detection component (207). When the electromagnet (2094) is de-energized, the detection component (207) sinks to the bottom under the action of gravity, that is, the detection component (207) sinks to the bottom of the inner wall of the oil pipeline (100); S302: When the electromagnet (2094) is energized, the traveling component (209) pulls the detection component (207) to move, thereby positioning the detection component (207) at the highest point of the outer surface of the oil pipeline (100); S303: The electromagnet (2094) remains energized, the detection component (207) stops moving, the retraction component (205) retracts the rope, thereby pulling the detection component (207) back. When the detection component (207) approaches the branch pipe (201), the electromagnet (2094) is de-energized, and finally the detection component (207) passes through the gate valve (203) and returns to the outer casing (202).

4. A detection method for an in-pipe detector for oil pipelines according to claim 2 or 3, characterized in that, The detection component (210) includes a pump b (2103) and a support (2081) disposed on the inner side of the large surface of the housing (208). The support (2081) is hollow inside. The large surface of the housing (208) is also provided with a clearance opening (2082) communicating with the support (2081). A groove cover (2083) is provided at the end opening of the support (2081). The support (2081) is fitted with a movable plug (2101) and a spring (2102) is provided between the two. The elastic force of the spring (2102) is used to make the movable plug (2101) move closer to the groove cover (2083); The input end of pump b (2103) is connected to the input hole provided on the side of the housing (208), and the output end of pump b (2103) is connected to the output hole provided on the trough cover (2083); The groove cover (2083) is connected to the oil drain hole on the side of the housing (208) by an oil drain pipe (2104), and a connecting valve (2105) is provided at the connection between the oil drain pipe (2104) and the oil drain hole. The movable plug (2101) is transparent and hollow inside and is equipped with a detection element.

5. A detection method for an in-pipe detector for oil pipelines according to claim 2 or 3, characterized in that, The gate valve (203) includes a fixed seat (2031) disposed between the branch pipe (201) and the outer casing (202). The upper surface of the fixed seat (2031) is provided with a sliding groove (2032), and the bottom of the sliding groove (2032) is provided with an inlet and outlet (2033). A gate (2035) is slidably installed in the chute (2032). The gate (2035) is connected to the linear module a (2036) set on the outer surface of the fixed seat (2031). The fixed seat (2031) is provided with a clearance hole (2034) for avoiding the linear module a (2036). When the gate (2035) is moved by the linear module a (2036), the inlet and outlet (2033) can be blocked or opened.

6. A detection method for an in-pipe detector for oil pipelines according to claim 2 or 3, characterized in that, A return assembly (204) is provided on one side of the outer casing (202). The return assembly (204) is used to pull the oil and gas medium inside the outer casing (202) back to the oil pipeline (100).

7. The detection method for an in-pipe detector for oil pipelines according to claim 6, characterized in that, The reflux assembly (204) includes pump a (2042), the input end of pump a (2042) is connected to the outer casing (202) through an oil inlet pipe (2043), and the output end of pump a (2042) is connected to the branch pipe (201) through an oil outlet pipe (2044).

8. The detection method for an in-pipe detector for oil pipelines according to claim 6, characterized in that, The outer surface of the outer casing (202) is provided with a side notch and a cover (2041) can be detachably installed at the opening of the side notch.

9. A detection method for an in-pipe detector for oil pipelines according to claim 2 or 3, characterized in that, The take-up and release assembly (205) includes a support body disposed inside the outer casing (202), on which a take-up and release shaft (2051), a motor a (2052) for driving the take-up and release shaft (2051) to rotate, a rope frame (2053) located on one side of the take-up and release shaft (2051), and a linear module b (2054) for driving the rope frame (2053) to move along the axis of the take-up and release shaft (2051). Both the support body and the rope frame (2053) are equipped with pulleys (2055). One end of the connecting rope (206) is wrapped around the take-up and release shaft (2051), and the other end passes through multiple pulleys (2055) and is connected to the detection component (207). Initially, the centerline of the detection component (207) located inside the outer casing (202) coincides with the centerline of the inlet and outlet (2033).

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