Oil and gas pipeline detection device

Abstract

The present application relates to an oil and gas pipeline detection device, and relates to the technical field of pipeline detection, including a detection trolley, a ground penetrating radar, a detection module, an alarm module, a satellite positioning module, a collection hood, the collection hood is arranged on the detection trolley, and a collection mechanism, the collection mechanism includes: a sealed box, which is arranged in the collection hood and is used to collect gas, and the detection module is arranged in the sealed box; an air intake pipe, which is arranged on the bottom of the sealed box and is used to discharge gas into or out of the sealed box; a sliding plate, which is slidingly arranged in the sealed box and performs sliding sealing on the top of the sealed box; a driving assembly, which is arranged on the collection hood and is used to drive the sliding plate to slide back and forth. The present application drives the sliding plate to reciprocate through the driving assembly, so as to realize the reciprocating cycle movement of the sealed box to inhale, detect, exhaust, and inhale the gas at the bottom of the collection hood through the air intake pipe, so that the gas emitted from the ground is quickly inhaled into the sealed box for detection, thereby improving the detection accuracy of oil and gas pipeline leakage.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline detection, and in particular to an oil and gas pipeline detection device. Background Art

[0002] There are many problems with buried pipelines in oil fields, such as multiple branches, unclear routes, and severe corrosion. Due to the lack of effective pipeline body detection methods, leakage is a common problem in buried pipelines in oil fields.

[0003] Currently, there is a detection vehicle on the market. The detection vehicle moves on the ground via driving wheels. The detection vehicle is equipped with a ground-penetrating radar for detecting the location of underground pipelines, a detection module for detecting the hydrogen sulfide content in ground gas, an alarm module that is electrically connected to the detection module and alarms when the detection module detects that the hydrogen sulfide content exceeds the standard, and a satellite positioning module for real-time recording the movement trajectory of the detection vehicle and marking the alarm location, so as to detect hydrogen sulfide and other leaked gases in oil and gas pipelines.

[0004] However, since the detection module is directly installed on the detection vehicle, which is a little distance away from the ground, the hydrogen sulfide leaked from the oil and gas pipeline enters the ground and eventually dissipates into the air. However, the hydrogen sulfide is easily diluted by the air when it enters the air. When the vehicle moves forward, the hydrogen sulfide emitted from the ground is easily affected by external factors such as wind when flowing toward the detection module, which reduces the hydrogen sulfide content in the air reaching the detection module, affecting the accuracy of the detection. Utility Model Content

[0005] In order to improve the detection accuracy of oil and gas pipeline leakage, the present application provides an oil and gas pipeline detection device.

[0006] The present application provides an oil and gas pipeline detection device, which adopts the following technical solution:

[0007] An oil and gas pipeline detection device includes a detection vehicle, a ground penetrating radar, a detection module, an alarm module, and a satellite positioning module. The detection vehicle is provided with a collection cover for collecting gas emitted from the ground. The collection cover is arranged on the detection vehicle. The collection cover is provided with a collection mechanism for collecting gas. The collection mechanism includes:

[0008] A sealed box, which is arranged in the collection cover and used to collect gas, and the detection module is arranged in the sealed box;

[0009] An air inlet pipe, which is arranged on the bottom of the sealed box and is used to discharge gas into or out of the sealed box;

[0010] A sliding plate, wherein the sliding plate is arranged in the sealing box to slide in a direction close to or away from the bottom of the sealing box, and the sliding plate performs sliding sealing on the top of the sealing box;

[0011] A driving assembly is arranged on the collecting cover and is used to drive the sliding plate to slide back and forth.

[0012] By adopting the above technical scheme, the position of the oil and gas pipeline is confirmed by the bottom-penetrating radar, the detection vehicle moves forward with the oil and gas pipeline, the collection cover moves with the detection vehicle during the movement, and the driving component drives the sliding plate to reciprocate, so as to realize the reciprocating cycle of suction, detection, exhaust and suction of the gas at the bottom of the collection cover by the sealing box through the air intake pipe, and the content of hydrogen sulfide in the gas in the sealing box is detected in real time through the detection module, so that the gas emitted from the ground is quickly sucked into the sealing box for detection, thereby improving the detection accuracy of oil and gas pipeline leakage.

[0013] Furthermore, an elastic pad is provided on one end of the sliding plate close to the bottom of the sealing box, and the elastic pad facilitates the sliding plate to be sealed tightly against the bottom of the sealing box when sliding downward.

[0014] By adopting the above technical solution, when the sliding plate slides to the bottom, the elastic pad presses against the bottom of the sealed box, so that all the gas in the sealed box is discharged, which is convenient for improving the accuracy of the next detection.

[0015] Further, the driving assembly comprises:

[0016] A connecting rod, the connecting rod is slidably arranged on the collecting cover and connected to the sliding plate, and the connecting rod is used to drive the sliding plate to slide;

[0017] A turntable, the turntable is rotatably arranged on the collecting cover, and the axis of the turntable is perpendicular to the sliding direction of the connecting rod;

[0018] A movable plate, the movable plate is arranged at one end of the connecting rod away from the sliding plate, and the movable plate is provided with a long strip sliding groove;

[0019] A column, wherein the column is eccentrically arranged on the rotating disk and slides in the sliding groove, and the column drives the connecting rod to slide;

[0020] A driving motor is arranged on the collecting cover and is used to drive the rotating disk to rotate.

[0021] By adopting the above technical solution, the driving motor is started, the driving motor drives the turntable to rotate, the column rotates with the turntable, and the movable plate moves on the turntable. Since the connecting rod is fixedly connected to the movable plate, and the connecting rod is fixedly connected to the sliding plate, the connecting rod can only slide back and forth along a straight line, and the column slides in the sliding groove, so that the movement direction of the column is decomposed into a direction along the connecting rod and a direction perpendicular to the connecting rod. The movement perpendicular to the connecting rod direction causes the column to slide in the sliding groove, and the movement along the connecting rod direction causes the column to drive the connecting rod to slide, thereby driving the connecting rod to reciprocate.

[0022] Furthermore, an air collecting hood is provided at one end of the air intake pipe close to the ground. The air collecting hood is trumpet-shaped and is used to guide the gas into the air intake pipe.

[0023] By adopting the above technical solution, the trumpet-shaped gas collecting hood is close to the ground, and the air suction range of the air intake pipe is increased by the trumpet-shaped gas collecting hood, so that the gas emitted from the ground can be quickly sucked into the air intake pipe, and finally enters the sealed box and the hydrogen sulfide content in the gas is detected by the detection module.

[0024] Further, the collection cover is arranged on the detection vehicle through a connecting assembly, and the connecting assembly includes:

[0025] A damper, which is arranged on the detection trolley and connected to the collection cover;

[0026] A telescopic spring is arranged on the detection trolley and connected to the collection cover. The telescopic spring and the damper work together to make the collection cover close to the ground.

[0027] By adopting the above technical solution, the damper and the telescopic spring work together to make the collecting cover close to the ground and move with the detection vehicle on the ground, so that the gas emitted from the ground can be sucked into the sealed box in time for detection.

[0028] Furthermore, four groups of rollers are arranged at the bottom of the collecting cover, and the rollers are in rolling contact with the ground and support the bottom of the collecting cover.

[0029] By adopting the above technical solution, four groups of rollers are in rolling contact with the ground, and the four groups of rollers support the bottom of the collection cover, so that the collection cover moves on the ground with the detection vehicle and always stays close to the ground.

[0030] Furthermore, the sealed box is provided with an exhaust pipe, which passes through the side wall of the collecting hood and is connected to the outside, the air inlet pipe is provided with a first one-way valve that only allows gas to enter the sealed box through the air inlet pipe, and the exhaust pipe is provided with a second one-way valve that only allows gas in the sealed box to be discharged through the exhaust pipe.

[0031] By adopting the above technical solution, the first one-way valve allows the air intake pipe to only absorb the gas discharged from the ground, and the second one-way valve allows the gas in the sealed box to only be discharged through the exhaust pipe, thereby reducing the probability of the gas after detection in the sealed box mixing into the newly inhaled gas.

[0032] Furthermore, a plurality of groups of flexible curtains are arranged on the bottom of the collecting hood, and the plurality of groups of flexible curtains seal the periphery of the collecting hood. The flexible curtains are in contact with the ground, and the exhaust pipe is located outside the flexible curtains.

[0033] By adopting the above technical solution, multiple groups of flexible curtains form a closure on the periphery of the gas collecting hood, so that the gas emitted from the ground is blocked by the multiple groups of flexible curtains at the position of the gas collecting hood and sucked into the sealed box through the air intake pipe. At the same time, the exhaust pipe is located outside the multiple groups of flexible curtains, reducing the probability of the gas after detection in the sealed box mixing into the newly inhaled gas.

[0034] Furthermore, a cross bar is provided on the detection trolley, the cross bar is perpendicular to the axis of the oil and gas pipeline, a plurality of collecting covers are arranged at intervals on the axis of the cross bar, and the plurality of collecting covers are connected to the cross bar through a connecting assembly.

[0035] By adopting the above technical solution, the cross bar and the axis of the oil and gas pipeline are perpendicular to each other, and a plurality of collecting hoods are installed on the cross bar at intervals, thereby improving the detection range of the detection vehicle.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] The position of the oil and gas pipeline is confirmed by the bottom-penetrating radar, and the detection trolley moves forward with the oil and gas pipeline. During the movement, the collection cover is connected to the detection trolley through a telescopic spring and moves with the detection trolley. The rollers provide rolling support for the bottom of the collection cover, and the driving motor drives the connecting rod to move back and forth, thereby driving the sliding plate to move back and forth, so that the sealing box can realize the reciprocating movement of suction, detection, exhaust, and suction of the gas at the bottom of the collection cover through the air intake pipe. The detection module is used to detect the hydrogen sulfide content in the gas in the sealing box in real time, so that the gas emitted from the ground is quickly sucked into the sealing box for detection, thereby improving the detection accuracy of oil and gas pipeline leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the detection device of the present application;

[0039] Figure 2 It is a schematic diagram of the structure of the collecting hood and its connecting components of the first embodiment;

[0040] Figure 3 is a schematic diagram of the collecting hood structure of the first embodiment, wherein the side wall of the collecting hood is cut away;

[0041] Figure 4 It is a schematic diagram of the structure of the collecting hood and its connecting components of the second embodiment;

[0042] Figure 5 It is a schematic diagram of the collecting hood structure of the second embodiment, in which the flexible curtain is not shown.

[0043] Figure numerals: 1. Detection trolley; 11. Ground penetrating radar; 12. Detector; 13. Alarm module; 14. Satellite positioning module; 15. Cross bar; 2. Collecting hood; 21. Roller; 22. Flexible curtain; 3. Connecting assembly; 31. Damper; 32. Telescopic spring; 4. Collecting mechanism; 41. Sealing box; 42. Air inlet pipe; 421. Air collecting hood; 43. Sliding plate; 431. Elastic pad; 5. Driving assembly; 51. Connecting rod; 52. Turntable; 53. Movable plate; 531. Sliding groove; 54. Column; 55. Driving motor; 6. First one-way valve; 7. Exhaust pipe; 71. Second one-way valve. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-5 This application is described in further detail.

[0045] The embodiment of the present application discloses an oil and gas pipeline detection device.

[0046] Example 1

[0047] Reference Figure 1 , an oil intake pipe detection device 42 includes a detection vehicle 1, a ground penetrating radar 11, a detection module, an alarm module 13, and a satellite positioning module 14. The detection vehicle 1 is provided with a collection cover 2 for collecting gas emitted from the ground. The collection cover 2 is arranged on the detection vehicle 1, and a collection mechanism 4 for collecting gas is arranged on the collection cover 2.

[0048] Reference Figure 1 and Figure 2 The detection trolley 1 moves on the ground through the driving wheels, and the bottom-penetrating radar is fixedly installed on the lower surface of the detection trolley 1 near the ground. The bottom-penetrating radar is used to detect the position of the underground pipeline, so that the detection trolley 1 always moves along the oil intake pipe 42; a cross bar 15 is fixedly installed at the front end of the detection trolley 1, and the cross bar 15 is perpendicular to the axis of the oil intake pipe 42. There are multiple collection covers 2 and they are arranged on the cross bar 15 at intervals, so as to improve the detection range of the detection trolley 1; four groups of rollers 21 are rotatably installed at the bottom of the collection cover 2, and the four groups of rollers 21 are in rolling contact with the ground, and the four groups of rollers 21 support the bottom of the collection cover 2. The top of the collecting hood 2 is connected to the detection trolley 1 through a connecting assembly 3, so that the detection trolley 1 is always in contact with the ground. The connecting assembly 3 includes a damper 31 and a telescopic spring 32. The fixed end of the damper 31 is fixedly mounted on the cross bar 15. The piston rod of the damper 31 is fixedly connected to the top of the collecting hood 2. The telescopic spring 32 is sleeved on the damper 31. One end of the telescopic spring 32 is fixedly mounted on the cross bar 15, and the other end of the telescopic spring 32 is fixedly mounted on the top of the collecting hood 2. The damper 31 and the telescopic spring 32 work together to make the collecting hood 2 close to the ground and move on the ground with the detection trolley 1.

[0049] Reference Figure 2 and Figure 3 The collecting mechanism 4 includes a sealed box 41, an air inlet pipe 42, a sliding plate 43 and a driving assembly 5. The sealed box 41 is fixedly installed inside the collecting cover 2, and the sealed box 41 is used to collect gas. The detection module is fixedly installed inside the sealed box 41, wherein the detection module is a detector 12 for detecting the content of hydrogen sulfide; the air inlet pipe 42 is fixedly installed on the bottom of the sealed box 41, and the air inlet pipe 42 is used to discharge gas into or out of the sealed box 41; the sliding plate 43 is slidably installed in the sealed box 41 along the direction close to or away from the bottom of the sealed box 41, and the sliding plate 43 performs sliding sealing on the top of the sealed box 41, and the sliding plate 43 is fixed on one end close to the bottom of the sealed box 41 An elastic pad 431 is installed; when the sliding plate 43 slides away from the bottom of the sealed box 41, the gas at the bottom of the collecting cover 2 is sucked into the sealed box 41 through the air inlet pipe 42, so that the detector 12 can detect the content of hydrogen sulfide in the gas; when the sliding plate 43 slides toward one end of the bottom of the sealed box 41, the gas in the collecting box is discharged through the air inlet pipe 42, and when the sliding plate 43 slides to the lowest end, the elastic pad 431 is pressed against the bottom of the sealed box 41, so that all the gas in the sealed box 41 is discharged, so as to improve the accuracy of the next detection; the sealed box 41 of this embodiment is designed as a whole with the collecting cover 2 and is located at one end of the bottom of the collecting cover 2.

[0050] Reference Figure 2 and Figure 3The driving assembly 5 is arranged on the collecting cover 2 and is used to drive the sliding plate 43 to slide back and forth. The driving assembly 5 includes a connecting rod 51, a rotating disk 52, a movable plate 53, a column 54 and a driving motor 55. The connecting rod 51 is slidably installed on the collecting cover 2 along the sliding direction of the sliding plate 43. The connecting rod 51 is fixedly connected to the sliding plate 43, and the connecting rod 51 is used to drive the sliding plate 43 to slide; the rotating disk 52 is rotatably installed on the collecting cover 2, and the axis of the rotating disk 52 is perpendicular to the sliding direction of the sliding rod; the movable plate 53 is fixedly installed on the end of the connecting rod 51 away from the sliding plate 43, and a long strip sliding groove 531 is opened on the movable plate 53 along the length direction, and the length direction of the movable plate 53 is perpendicular to the sliding direction of the connecting rod 51; the column 54 is a cylindrical structure, and the column 54 is eccentrically installed on the upper surface of the rotating disk 52. The column 54 slides in the sliding groove 531, and the column 54 passes The movable plate 53 drives the connecting rod 51 to slide, thereby driving the sliding plate 43 to slide back and forth, thereby realizing the reciprocating cycle motion of inhaling and detecting the gas and then discharging it; when in use, start the driving motor 55, the driving motor 55 drives the turntable 52 to rotate, the column 54 rotates with the turntable 52, and the movable plate 53 moves on the turntable 52. Since the connecting rod 51 is fixedly connected to the movable plate 53, and the connecting rod 51 is fixedly connected to the sliding plate 43, the connecting rod 51 can only slide back and forth along a straight line, and the column 54 slides in the sliding groove 531, thereby decomposing the movement direction of the column 54 into a direction along the connecting rod 51 and a direction perpendicular to the connecting rod 51. The movement perpendicular to the direction of the connecting rod 51 makes the column 54 slide in the sliding groove 531, and the movement along the direction of the connecting rod 51 makes the column 54 drive the connecting rod 51 to slide, thereby realizing driving the connecting rod 51 to reciprocate.

[0051] Reference Figure 3 In order to improve the absorption of ground exhaust gas by the air intake pipe 42, an air collecting hood 421 is fixedly installed on the end of the air intake pipe 42 close to the ground. The air collecting hood 421 is a trumpet-shaped structure. The air collecting hood 421 is close to the ground. The trumpet-shaped air collecting hood 421 increases the air suction range of the air intake pipe 42, so that the gas emitted from the ground can be quickly sucked into the air intake pipe 42, and finally enters the sealing box 41 and the content of hydrogen sulfide in the gas is detected by the detector 12.

[0052] Reference Figure 1 and Figure 3 The detector 12 is electrically connected to the alarm module 13. When the detector 12 detects that the hydrogen sulfide content in the gas in the sealed box 41 exceeds the set value, the alarm module 13 performs alarm processing to mark the location where the hydrogen sulfide content exceeds the standard; the satellite positioning module 14 is fixedly installed on the detection vehicle 1 to upload the movement path and alarm position of the detection vehicle 1 to the terminal, so that the staff can quickly find the oil intake pipe 42 and the leakage location.

[0053] The working principle of the embodiment of the present application is as follows:

[0054] The position of the oil inlet pipe 42 is confirmed by the bottom-penetrating radar, and the detection trolley 1 moves forward along the oil inlet pipe 42. During the movement, the collecting hood 2 is connected to the detection trolley 1 by the telescopic spring 32 and moves along with the detection trolley 1, and the roller 21 provides rolling support for the bottom of the collecting hood 2. The driving motor 55 drives the connecting rod 51 to move back and forth, and then drives the sliding plate 43 to move back and forth, so as to realize the reciprocating movement of the sealing box 41 to inhale, detect, exhaust, and inhale the gas at the bottom of the collecting hood 2 through the air inlet pipe 42, and the content of hydrogen sulfide in the gas in the sealing box 41 is detected in real time by the detector 12, so that the gas emitted from the ground is quickly sucked into the sealing box 41 for detection, thereby improving the detection accuracy of leakage of the oil inlet pipe 42.

[0055] Example 2

[0056] Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that, in order to reduce the probability that the gas after the detection in the sealed box 41 is mixed into the newly inhaled gas, an exhaust pipe 7 is fixedly installed on the sealed box 41, and the exhaust pipe 7 is connected to the inside of the sealed box 41. The exhaust pipe 7 passes through the side wall of the collection cover 2 and is connected to the outside. A first one-way valve 6 is fixedly installed on the intake pipe 42. The first one-way valve 6 is used to only allow gas to enter the sealed box 41 through the intake pipe 42, so that the intake pipe 42 can only absorb the gas discharged from the ground; a second one-way valve 71 is fixedly installed on the exhaust pipe 7. The second one-way valve 71 is used to only allow the gas in the sealed box 41 to be discharged through the exhaust pipe 7, so that the gas after the detection in the sealed box 41 is discharged separately, reducing the probability that the gas after the detection in the sealed box 41 is mixed into the newly inhaled gas.

[0057] Reference Figure 4 and Figure 5 A plurality of sets of flexible curtains 22 are fixedly installed on the bottom of the collecting hood 2. The plurality of sets of flexible curtains 22 form a closure for the periphery of the gas collecting hood 421. The flexible curtains 22 are in contact with the ground, so that the gas emitted from the ground is blocked by the plurality of sets of flexible curtains 22 at the position of the gas collecting hood 421 and is sucked into the sealing box 41 through the air inlet pipe 42. At the same time, the exhaust pipe 7 is located outside the plurality of sets of flexible curtains 22, thereby reducing the probability of the gas after detection in the sealing box 41 mixing into the newly inhaled gas.

[0058] The working principle of the embodiment of the present application is as follows:

[0059] The gas emitted from the ground is blocked by multiple groups of flexible curtains 22 and sucked into the sealed box 41 through the air intake pipe 42. When the detector 12 completes the gas detection, the gas in the sealed box 41 is discharged through the exhaust pipe 7. The first one-way valve 6 allows the air intake pipe 42 to only absorb the gas discharged from the ground. The second one-way valve 71 allows the gas in the sealed box 41 to only be discharged through the exhaust pipe 7, thereby reducing the probability of the gas after the detection in the sealed box 41 mixing into the newly inhaled gas.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil and gas pipeline detection device, comprising a detection vehicle (1), a ground penetrating radar (11), a detection module, an alarm module (13), and a satellite positioning module (14), characterized in that: The detection trolley (1) is provided with a collection hood (2) for collecting gas emitted from the ground. The collection hood (2) is arranged on the detection trolley (1). The collection hood (2) is provided with a collection mechanism (4) for collecting gas. The collection mechanism (4) comprises: A sealed box (41), the sealed box (41) being arranged in the collection cover (2) and used for collecting gas, and the detection module being arranged in the sealed box (41); An air inlet pipe (42), the air inlet pipe (42) being arranged on the bottom of the sealed box (41) and used for discharging gas into or out of the sealed box (41); A sliding plate (43), the sliding plate (43) being arranged in the sealing box (41) to slide in a direction close to or away from the bottom of the sealing box (41), the sliding plate (43) performing sliding sealing on the top of the sealing box (41); A driving assembly (5), wherein the driving assembly (5) is arranged on the collecting cover (2) and is used to drive the sliding plate (43) to slide back and forth.

2. The oil and gas pipeline detection device according to claim 1, characterized in that: An elastic pad (431) is provided on one end of the sliding plate (43) close to the bottom of the sealing box (41), and the elastic pad (431) facilitates the sliding plate (43) to be tightly sealed against the bottom of the sealing box (41) when sliding downward.

3. The oil and gas pipeline detection device according to claim 1, characterized in that: The driving component (5) comprises: A connecting rod (51), the connecting rod (51) being slidably disposed on the collecting cover (2) and connected to the sliding plate (43), the connecting rod (51) being used to drive the sliding plate (43) to slide; A rotating disk (52), the rotating disk (52) being rotatably disposed on the collecting cover (2), the axis of the rotating disk (52) being perpendicular to the sliding direction of the connecting rod (51); A movable plate (53), the movable plate (53) being arranged at one end of the connecting rod (51) away from the sliding plate (43), and the movable plate (53) being provided with a long strip sliding groove (531); A column (54), wherein the column (54) is eccentrically arranged on the rotating disk (52) and slides in the sliding groove (531), and the column (54) drives the connecting rod (51) to slide; A drive motor (55) is arranged on the collection cover (2) and is used to drive the rotating disk (52) to rotate.

4. The oil and gas pipeline detection device according to claim 2, characterized in that: An air collecting hood (421) is provided at one end of the air intake pipe (42) close to the ground. The air collecting hood (421) is trumpet-shaped and is used to guide gas into the air intake pipe (42).

5. The oil and gas pipeline detection device according to claim 1, characterized in that: The collecting hood (2) is arranged on the detection vehicle (1) via a connecting assembly (3), and the connecting assembly (3) comprises: A damper (31), which is arranged on the detection trolley (1) and connected to the collection cover (2); A telescopic spring (32), wherein the telescopic spring (32) is arranged on the detection trolley (1) and connected to the collection cover (2), and the telescopic spring (32) and the damper (31) work together to make the collection cover (2) close to the ground.

6. The oil and gas pipeline detection device according to claim 5, characterized in that: Four groups of rollers (21) are arranged at the bottom of the collection cover (2), and the rollers (21) are in rolling contact with the ground and support the bottom of the collection cover (2).

7. The oil and gas pipeline detection device according to claim 1, characterized in that: The sealed box (41) is provided with an exhaust pipe (7), the exhaust pipe (7) passing through the side wall of the collecting cover (2) and communicating with the outside, the air inlet pipe (42) is provided with a first one-way valve (6) for allowing only gas to enter the sealed box (41) through the air inlet pipe (42), and the exhaust pipe (7) is provided with a second one-way valve (71) for allowing only gas in the sealed box (41) to be discharged through the exhaust pipe (7).

8. The oil and gas pipeline detection device according to claim 7, characterized in that: A plurality of groups of flexible curtains (22) are arranged on the bottom of the collecting hood (2), the plurality of groups of flexible curtains (22) seal the periphery of the collecting hood (421), the flexible curtains (22) are in contact with the ground, and the exhaust pipe (7) is located outside the flexible curtains (22).

9. The oil and gas pipeline detection device according to claim 5, characterized in that: The detection trolley (1) is provided with a cross bar (15), the cross bar (15) and the axis of the oil and gas pipeline are perpendicular to each other, a plurality of collection hoods (2) are arranged at intervals on the axis of the cross bar (15), and the plurality of collection hoods (2) are connected to the cross bar (15) via a connecting assembly (3).

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