Detection device for gas pipeline

Abstract

The invention discloses a detection device for a gas pipeline, relates to the field of sampling and detection of gas in a pipeline, and solves the problems that when an existing detection device for the gas pipeline is used, the sampling position is single, the influence on gas flow in the sampling process is relatively large, and the detection accuracy is influenced. The detection mechanism comprises a gas detector, a rotating ring, a detection rod, a conveying piece, a control piece and a rotating piece, and a collecting hole is formed in the side face of the detection rod. According to the gas collecting device, gas in different coming directions in the pipeline can be collected and detected in a switching mode, the detection mechanism can collect and detect the gas in different positions in the pipeline, it is guaranteed that the inner wall of the pipeline is smooth in the process of stopping collection, meanwhile, the influence on the gas flow state in the gas collecting process is reduced, and the gas collecting efficiency is improved. The sampling efficiency of gas in the pipeline and the accuracy of detection results are improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas sampling and detection in pipelines, and in particular to a detection device for a gas transmission pipeline. Background Art

[0002] Pipeline gas transmission is a common gas transmission method with the advantages of high transportation efficiency, high safety, wide application range, long service life and low cost. In the process of pipeline gas transmission, some mixed gases (such as natural gas, water gas, etc.) are sometimes transported. The main component of natural gas is methane, which is also mixed with some ethane, propane, butane, carbon dioxide, nitrogen and other impurity gases. Some natural gas pipelines with long transmission distances generally have a larger diameter, sometimes even more than three meters. During use, due to gas diffusion, convection mixing, pipe wall resistance, temperature and pressure changes, etc., the gas position distribution of different components in the process of gas transportation will be different inside some larger-sized pipelines. For example, some gases that are easily adsorbed by the wall are easy to approach the pipe wall during transportation, and the distribution of some heavy component gases tends to be at the bottom of the pipeline.

[0003] When testing the gas composition in a gas pipeline, existing testing equipment often only samples and tests the gas output from a certain position in the pipeline. Affected by the sampling position, the results of the gas samples at different positions will also be different. For example, when sampling and testing the gas inside a large natural gas pipeline, different sampling positions will result in large differences in the methane ratio. Since the relative molecular mass of methane is much smaller than the relative molecular mass of carbon dioxide, the stratification phenomenon of the two is relatively significant when they are stationary or slowly transported in the pipeline, resulting in a larger methane ratio in some positions and a larger carbon dioxide content in some positions during the test. These cannot fully and accurately detect the composition ratio of the gas in the pipeline, and the test results have large errors. Summary of the invention

[0004] The object of the present invention is to provide a detection device for a gas pipeline that is convenient for improving the efficiency of sampling gas at different positions in the pipeline, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a detection device for a gas transmission pipeline, comprising a shell and a detection mechanism, wherein a delivery cavity is provided in the shell, and a connector for connecting with pipelines on both sides is provided on the shell, and the detection mechanism comprises a gas detector fixedly mounted on the shell, and a rotating ring is rotatably connected to the inner wall of the shell, and the inner diameter of the rotating ring is the same as the inner diameter of the delivery cavity and the pipelines on both sides, and two groups of detection rods are provided on the rotating ring, and a collecting hole is provided on the side of the detection rod, and a conveying member for respectively outputting the gas samples collected in the collecting holes on both sides is provided in the shell, and a control member for synchronously controlling the detection rods on both sides to telescopically slide is provided in the shell, and a rotating member for driving the rotating ring to rotate and automatically switching the direction of the collecting hole according to the different rotation directions during the rotation process, so that the gas from different directions in the pipeline can be switched to be collected and detected, and the detection mechanism can collect and detect gas at different positions in the pipeline, and ensure the smoothness of the inner wall of the pipeline during the process of stopping the collection, and reduce the influence on the airflow state during the gas collection process, so as to improve the efficiency of gas sampling at different positions in the pipeline.

[0006] Preferably, the rotating member includes a half-stroke gear fixedly mounted on the outer wall of the detection rod, and two groups of sliding grooves are opened in the rotating ring, one end of the two groups of sliding grooves are both facing the center of the rotating ring, and are symmetrically distributed on both sides of the center of the rotating ring, the half-stroke gear and the outer wall of the detection rod are movably fitted with the inner wall of the sliding groove, and two groups of gear columns are rotatably connected in the shell, and the two groups of half-stroke gears are respectively meshed with the gear columns on both sides, and a semicircular ring is fixedly connected to the half-stroke gear, and a driving member is provided in the shell for preferentially driving the gear column to rotate, and synchronously driving the rotating ring to rotate after the gear column and the semicircular ring are engaged and contacted, so as to facilitate the driving of the rotating ring to rotate and automatically switch the direction of the collecting hole according to the different rotation directions during the rotation, so that the collection and detection of gases from different directions in the pipeline can be switched.

[0007] Preferably, the driving member includes a bevel gear ring rotatably connected to the outer wall of the rotating ring, one end of the gear column is coaxially fixedly connected to a rotating rod rotatably connected to the rotating ring, the rotating rod is coaxially fixedly connected to a bevel gear plate meshing with the bevel gear ring, the side of the bevel gear ring is fixedly connected to a connecting ring, and a transmission member for driving the connecting ring to rotate is provided in the shell, so as to preferentially drive the gear column to rotate, and synchronously drive the rotating ring to rotate after the gear column is engaged and abutted with the semicircular ring.

[0008] Preferably, the control component includes a first connecting tube and a second connecting tube fixedly mounted on the rotating ring, and a collecting tube connected to the collecting hole is opened in the two groups of detection rods, and the sliding groove is used to store hydraulic oil. The two groups of collecting tubes are movably connected to the outer walls of the first connecting tube and the second connecting tube respectively, and one end of the detection rod is rotatably connected to a control ring, and a tension spring fixedly connected to the sliding groove is fixedly connected to the side of the control ring, and a hydraulic component for controlling the hydraulic strength in the sliding groove is provided on the shell, so as to facilitate the synchronous control of the telescopic sliding of the detection rods on both sides.

[0009] Preferably, the conveying member includes a first annular tube and a second annular tube fixedly installed in the shell, the outer wall of the rotating ring is provided with a first annular groove and a second annular groove, the first annular tube is rotatably connected to the inner wall of the first annular groove, the second annular tube is rotatably connected to the inner wall of the second annular groove, the first annular tube is connected to the first annular groove, the second annular tube is connected to the second annular groove, the first connecting tube is connected to the first annular groove, and the second connecting tube is connected to the second annular groove, so as to facilitate the separate output of the gas samples collected in the collection holes on both sides.

[0010] Preferably, the hydraulic component includes a third annular tube fixedly installed in the shell, the outer wall of the rotating ring is provided with a third annular groove, the third annular tube is rotatably connected to the inner wall of the third annular groove, the third annular tube is communicated with the third annular groove, the third annular tube is connected to the third annular groove, the third annular tube is connected to a hydraulic pipe, the rotating ring is provided with two groups of connecting holes for connecting the sliding grooves on both sides with the third annular groove, and the shell is provided with an adjusting component for controlling the hydraulic strength in the hydraulic pipe, so as to facilitate the control of the hydraulic strength in the sliding groove.

[0011] Preferably, the transmission member includes a driving motor fixedly installed in the shell, the output end of the driving motor is coaxially fixedly connected to the driving shaft, the driving shaft is coaxially fixedly connected to a worm, and the outer wall of the connecting ring is fixedly connected to a worm gear ring meshing with the worm, so as to drive the connecting ring to rotate.

[0012] Preferably, the adjusting member includes a hydraulic cylinder fixedly installed in the shell, an electric telescopic rod is fixedly connected to the shell, the telescopic end of the electric telescopic rod is fixedly connected to a hydraulic plate slidingly connected to the inner wall of the hydraulic cylinder, the hydraulic cylinder is used to store hydraulic oil, and one end of the hydraulic pipe is connected to the hydraulic cylinder to facilitate control of the hydraulic strength in the hydraulic pipe.

[0013] Preferably, the first annular tube and the second annular tube are respectively connected to a detection tube connected to the input end of the detector, so as to facilitate output detection of the sampled gas.

[0014] Preferably, the connecting member includes a threaded tube rotatably connected to both sides of the shell, the threaded tubes on both sides can be threadedly connected to the pipes on both sides respectively, and sealing rings are fixedly connected to both sides of the shell to facilitate the connection of the shell with the pipes on both sides.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a detection device for a gas pipeline, which solves the problem that the existing detection device for a gas pipeline has a single sampling position when in use and has a relatively large impact on the airflow during the sampling process, thereby affecting the detection accuracy. The gas samples collected in the collection holes on both sides are output separately through a conveying member, and the detection rods on both sides are synchronously controlled to telescope and slide through a control member. The rotating ring is driven to rotate through a rotating member, and the orientation of the collection hole can be automatically switched according to the different rotation directions during the rotation, so that the collection and detection of gases from different directions in the pipeline can be switched. The detection mechanism can collect and detect gases at different positions in the pipeline, and the smoothness of the inner wall of the pipeline is ensured during the process of stopping collection. At the same time, the impact on the airflow state during the gas collection process is reduced, thereby improving the gas sampling efficiency in the pipeline and the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the connecting piece of the present invention; Figure 3 It is a schematic diagram of the internal structure of the housing of the present invention; Figure 4 It is a partial structural cross-sectional view of the adjusting member of the present invention; Figure 5 for Figure 4 A magnified image of the middle A area; Figure 6 It is a schematic diagram of the local structure of the detection mechanism of the present invention; Figure 7 for Figure 6 Enlarged view of area B; Figure 8 for Figure 6 Enlarged view of area C in the middle; Fig. 9 It is a partial structural sectional view of the detection mechanism of the present invention.

[0017] In the figure: 1-housing; 2-conveying cavity; 3-gas detector; 4-rotating ring; 5-detection rod; 6-collecting hole; 7-half-distance gear; 8-sliding groove; 9-gear column; 10-semicircular ring; 11-bevel gear ring; 12-rotating rod; 13-bevel gear plate; 14-connecting ring; 15-first connecting pipe; 16-second connecting pipe; 17-collecting pipe; 18-control ring; 19-tension spring; 20-first annular pipe; 21-second annular pipe; 22-first annular groove; 23-second annular groove; 24-third annular pipe; 25-third annular groove; 26-hydraulic pipe; 27-connecting hole; 28-driving motor; 29-driving shaft; 30-worm; 31-worm wheel ring; 32-hydraulic cylinder; 33-electric telescopic rod; 34-hydraulic plate; 35-detection pipe; 36-threaded pipe; 37-sealing ring; 38-pipeline. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1-Figure 9 , a detection device for a gas pipeline shown in the figure includes a shell 1 and a detection mechanism, a delivery chamber 2 is opened in the shell 1, a connector for connecting with pipelines 38 on both sides is provided on the shell 1, the connector includes a threaded tube 36 rotatably connected to both sides of the shell 1, the threaded tubes 36 on both sides can be threadedly connected to the pipelines 38 on both sides, and sealing rings 37 are fixedly connected to both sides of the shell 1. The detection mechanism includes a gas detector 3 fixedly mounted on the shell 1, a rotating ring 4 is rotatably connected to the inner wall of the shell 1, the inner diameter of the rotating ring 4 is the same as the inner diameter of the delivery chamber 2 and the pipelines 38 on both sides, and two sets of detection rods 5 are provided on the rotating ring 4, and the side of the detection rod 5 is opened There is a collecting hole 6, and a conveying part is provided in the shell 1 for separately outputting the gas samples collected in the collecting holes 6 on both sides. A control part is provided in the shell 1 for synchronously controlling the telescopic sliding of the detection rods 5 on both sides. The shell 1 is provided with a rotating part for driving the rotating ring 4 to rotate and can automatically switch the direction of the collecting hole 6 according to the different rotation directions during the rotation, so that it can switch to collect and detect gases from different directions in the pipeline 38. The detection mechanism can collect and detect gases at different positions in the pipeline 38, and ensure the smoothness of the inner wall of the pipeline 38 during the process of stopping collection, while reducing the impact on the airflow state during the gas collection process.

[0020] The rotating part includes a half-stroke gear 7 fixedly mounted on the outer wall of the detection rod 5, and two sets of sliding grooves 8 are opened in the rotating ring 4. One end of the two sets of sliding grooves 8 are both facing the center of the rotating ring 4, and are symmetrically distributed on both sides of the center of the rotating ring 4. The outer wall of the half-stroke gear 7 and the detection rod 5 are movably fitted with the inner wall of the sliding groove 8. Two sets of gear columns 9 are rotatably connected in the shell 1, and the two sets of half-stroke gears 7 are respectively meshed with the gear columns 9 on both sides. A semicircular ring 10 is fixedly connected to the half-stroke gear 7. A driving member is provided in the shell 1 for preferentially driving the gear column 9 to rotate, and synchronously driving the rotating ring 4 to rotate after the gear column 9 and the semicircular ring 10 are engaged and abutted.

[0021] The driving member includes a bevel gear ring 11 rotatably connected to the outer wall of the rotating ring 4, one end of the gear column 9 is coaxially fixedly connected to a rotating rod 12 rotatably connected to the rotating ring 4, a bevel gear plate 13 meshing with the bevel gear ring 11 is coaxially fixedly connected to the rotating rod 12, a connecting ring 14 is fixedly connected to the side of the bevel gear ring 11, and a transmission member for driving the connecting ring 14 to rotate is provided in the housing 1.

[0022] The control component includes a first connecting tube 15 and a second connecting tube 16 fixedly mounted on the rotating ring 4. A collecting tube 17 connected to the collecting hole 6 is provided in the two groups of detection rods 5. The sliding groove 8 is used to store hydraulic oil. The two groups of collecting tubes 17 are movably connected to the outer walls of the first connecting tube 15 and the second connecting tube 16 respectively. One end of the detection rod 5 is rotatably connected to a control ring 18. The side of the control ring 18 is fixedly connected to a tension spring 19 fixedly connected to the sliding groove 8. A hydraulic component for controlling the hydraulic strength in the sliding groove 8 is provided on the housing 1.

[0023] The conveying member includes a first annular tube 20 and a second annular tube 21 fixedly installed in the shell 1, and the outer wall of the rotating ring 4 is provided with a first annular groove 22 and a second annular groove 23. The first annular tube 20 is rotatably connected to the inner wall of the first annular groove 22, and the second annular tube 21 is rotatably connected to the inner wall of the second annular groove 23. The first annular tube 20 is connected to the first annular groove 22, and the second annular tube 21 is connected to the second annular groove 23. The first connecting tube 15 is connected to the first annular groove 22, and the second connecting tube 16 is connected to the second annular groove 23. The first annular tube 20 and the second annular tube 21 are respectively connected with a detection tube 35 connected to the input end of the detector.

[0024] The hydraulic parts include a third annular tube 24 fixedly installed in the shell 1, a third annular groove 25 is provided on the outer wall of the rotating ring 4, the third annular tube 24 is rotatably connected to the inner wall of the third annular groove 25, the third annular tube 24 is connected to the third annular groove 25, a hydraulic pipe 26 is connected to the third annular tube 24, two groups of connecting holes 27 for connecting the sliding grooves 8 on both sides with the third annular groove 25 are opened on the rotating ring 4, and an adjusting part for controlling the hydraulic strength in the hydraulic pipe 26 is provided in the shell 1.

[0025] In this embodiment, the threaded tube 36 is rotated to connect with the pipes 38 on both sides. The inner diameter of the pipe 38 is the same as the inner diameter of the delivery chamber 2 and the rotating ring 4, ensuring that the interior of the pipe 38 is in a relatively unobstructed state when not in the detection state, thereby reducing the impact on the gas delivery process.

[0026] When detection is required, the hydraulic pipe 26 is pressurized through the adjusting piece, so that the hydraulic oil is transported from the third annular pipe 24 to the third annular groove 25, and then enters the connected sliding groove 8 through the connecting hole 27, so that the liquid pressure in the sliding groove 8 is increased, pushing the detection rod 5 to slide in the sliding groove 8, and the tension spring 19 is stretched. By controlling the size of the hydraulic pressure in the hydraulic pipe 26, the extension length of the detection rod 5 in the sliding grooves 8 on both sides can be synchronously regulated. When the rotating ring 4 rotates, the third annular groove 25 can always be connected with the third annular pipe 24, ensuring the stable delivery of hydraulic oil.

[0027] When it is necessary to switch the position of the detection rod 5 on the rotating ring 4, the connecting ring 14 and the bevel gear ring 11 are driven to rotate by the transmission member. The bevel gear ring 11 will preferentially drive the bevel gear plate 13 to rotate. The bevel gear plate 13 drives the rotating rod 12 to rotate the gear column 9, and the gear column 9 drives the half-stroke gear 7 to rotate. The half-stroke gear 7 is affected by the semi-circular ring 10 and can only rotate half a circle each time. After that, the gear column 9 conflicts with the outer wall of the semi-circular ring 10, and the gear column 9 cannot continue to rotate. Thereafter, the bevel gear ring 11 and the rotating ring 4 can form a whole for rotation adjustment. When the rotating ring 4 continues to rotate unidirectionally, the gear column 9 is always in a stuck state, and the position of the detection rod 5 will not rotate by itself, but only drive the detection rod 5 to revolve along the center of the rotating ring 4. During this process, the direction of the collecting hole 6 remains unchanged. By adjusting the hydraulic strength in the sliding groove 8, the position where the collecting hole 6 on the detection rod 5 extends is changed, so that the gas at different positions in the conveying chamber 2 can be collected.

[0028] It is worth noting that: through the synchronous extension and rotation adjustment of the two groups of detection rods 5 with symmetrical design, a relatively balanced and symmetrical interference can be generated on the airflow in the pipe 38 during the detection and sampling process, thereby reducing the disturbance of the airflow inside the pipe 38. Since the opening of the collecting hole 6 is located at the top side wall of the detection rod 5, the gas near the side wall of the pipe 38 can be collected through the collecting hole 6 when the detection rod 5 is just extended a short distance. When the detection rod 5 is fully extended, the top ends of the detection rods 5 on both sides can collide with each other, so that the gas at the center position of the pipe 38 can be sampled.

[0029] When it is necessary to switch the direction of the collecting hole 6, the control connecting ring 14 and the bevel gear ring 11 are rotated in the opposite direction. At this time, the gear column 9 can drive the half-distance gear 7 and the detection rod 5 to rotate in the opposite direction. After rotating 180°, the direction of the collecting hole 6 changes, and the gear column 9 is stuck with the other side of the semicircular ring 10 again. After that, the connecting ring 14 can directly drive the rotating ring 4 to rotate in the opposite direction as a whole, and collect and sample the gas flowing in this direction. During the rotation, the detection rod 5 will rotate relative to the control ring 18 and is always subjected to the tension of the tension spring 19. At the same time, the collecting tube 17 can be on the outer wall of the first connecting tube 15 and the second connecting tube 16. The detection rod 5 is telescopically slid in the sliding groove 8, and the half-distance gear 7 will always slide in mesh with the gear column 9. The gas collected in the collecting hole 6 can be output to the first annular tube 20 and the second annular tube 21 through the first connecting tube 15 and the second connecting tube 16 on both sides, respectively, and transported to the gas detector 3 through the detection tube 35 for detection. The design of the first annular tube 20, the first annular groove 22, and the second annular tube 21 and the second annular groove 23 allows the rotating ring 4 to always output the gas collected in the collecting holes 6 on both sides to the specific detection tube 35 for sampling and detection during the rotation.

[0030] It should be noted that: when performing gas sampling detection, it is necessary to first control the collection hole 6 on the detection rod 5 to reach the desired position, and then open the conveying state between the detection tube 35 and the gas detector 3 to perform gas sampling operations. During detection, it is necessary to discharge the front gas first to avoid interference from the original gas in the first annular tube 20 and the second annular tube 21. When switching the position of the collection hole 6, it is necessary to close the detection tube 35 and then open it again after reaching the desired position for gas sampling detection to improve the accuracy of the detection operation.

[0031] After the detection is completed, the gas components at different positions in the large pipeline 38 can be distinguished, so that different qualities of gas can be transported to different areas by connecting with multiple groups of pipelines 38 at the output end, realizing a preliminary automatic separation function. For example, in the process of cross-border transportation of natural gas, multiple groups of pipelines 38 with relatively small inner diameters are connected at the end of the output end to output gas from different areas in the pipeline 38. High-quality natural gas with a higher methane content can be transported to areas with higher selling prices, while gas with a relatively low methane content can be sold and exported at a lower unit price. There is no need for manual separation operations, and only the gas at different positions during the transportation of the pipeline 38 can be directly output. Due to the influence of changing factors such as temperature and pressure, it is necessary to continuously monitor the gas components at different positions in the pipeline 38, and flexibly adjust the state of the pipeline 38 to which the output pipe is connected to ensure that the output pipe can always output high-quality and low-quality gases to the designated pipeline 38 respectively.

[0032] Example 2: Please refer to Figure 2-Figure 8 This embodiment further illustrates the first embodiment. The transmission member shown in the figure includes a drive motor 28 fixedly installed in the housing 1. The model of the drive motor 28 is preferably YYHS-40. The output end of the drive motor 28 is coaxially fixedly connected to a drive shaft 29. A worm 30 is coaxially fixedly connected to the drive shaft 29. The outer wall of the connecting ring 14 is fixedly connected to a worm wheel ring 31 meshing with the worm 30.

[0033] In the present embodiment, the driving motor 28 drives the driving shaft 29 to rotate, so that the worm 30 drives the worm gear ring 31 to rotate, and the worm gear ring 31 drives the connecting ring 14 to rotate, thereby realizing the functions of switching the direction of the collecting hole 6 and switching the angle of the rotating ring 4. The driving method of driving the worm gear ring 31 by the worm 30 makes the drive more stable, and can be stopped and limited at any time to avoid the rotating ring 4 swinging.

[0034] Example 3: Please refer to Figure 2-Figure 8 This embodiment further illustrates the first embodiment. The adjusting member shown in the figure includes a hydraulic cylinder 32 fixedly installed in the housing 1. An electric telescopic rod 33 is fixedly connected in the housing 1. The telescopic end of the electric telescopic rod 33 is fixedly connected to a hydraulic plate 34 slidably connected to the inner wall of the hydraulic cylinder 32. The hydraulic cylinder 32 is used to store hydraulic oil. One end of the hydraulic pipe 26 is connected to the hydraulic cylinder 32.

[0035] In this embodiment, the hydraulic plate 34 is allowed to slide in the hydraulic cylinder 32 by controlling the telescopic state of the electric telescopic rod 33. When the hydraulic plate 34 moves downward, the hydraulic oil in the hydraulic cylinder 32 can be pushed downward into the hydraulic pipe 26, so that the pressure in the sliding groove 8 increases and the detection rod 5 slides out. When the hydraulic plate 34 moves upward, the hydraulic oil in the sliding groove 8 can be reversely pumped into the hydraulic cylinder 32, thereby reducing the hydraulic strength in the sliding groove 8.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas pipeline detection device, characterized in that: include: A shell (1), wherein a conveying cavity (2) is provided in the shell (1), and a connecting piece for connecting to pipelines on both sides is provided on the shell (1); Also includes: A detection mechanism, the detection mechanism comprising a gas detector (3) fixedly mounted on the shell (1), the inner wall of the shell (1) being rotatably connected to a rotating ring (4), the inner diameter of the rotating ring (4) being the same as the inner diameter of the conveying cavity (2) and the pipes on both sides, the rotating ring (4) being provided with two groups of detection rods (5), the side surfaces of the detection rods (5) being provided with collecting holes (6), the shell (1) being provided with a conveying member for respectively outputting the gas samples collected in the collecting holes (6) on both sides, the shell (1) being provided with a control member for synchronously controlling the telescopic sliding of the detection rods (5) on both sides, the shell (1) being provided with a rotating member for driving the rotating ring (4) to rotate and being able to automatically switch the orientation of the collecting holes (6) according to different rotation directions during the rotation process, so as to switch the collection and detection of gas from different directions in the pipe, the detection mechanism being able to collect and detect gas at different positions in the pipe, ensuring the smoothness of the inner wall of the pipe during the process of stopping the collection, and reducing the influence on the gas flow state during the gas collection process.

2. A gas pipeline detection device according to claim 1, characterized in that: The rotating member comprises a half-stroke gear (7) fixedly mounted on the outer wall of the detection rod (5); two groups of sliding grooves (8) are provided in the rotating ring (4); one end of the two groups of sliding grooves (8) are both oriented toward the center of the rotating ring (4) and are symmetrically distributed on both sides of the center of the rotating ring (4); the outer walls of the half-stroke gear (7) and the detection rod (5) are movably fitted with the inner walls of the sliding grooves (8); two groups of gear columns (9) are rotatably connected in the housing (1); the two groups of half-stroke gears (7) are respectively meshed with the gear columns (9) on both sides; a semicircular ring (10) is fixedly connected to the half-stroke gear (7); and a driving member is provided in the housing (1) for preferentially driving the gear column (9) to rotate and synchronously driving the rotating ring (4) to rotate after the gear column (9) and the semicircular ring (10) are engaged and abutted.

3. A gas pipeline detection device according to claim 2, characterized in that: The driving member comprises a bevel gear ring (11) rotatably connected to the outer wall of the rotating ring (4); one end of the gear column (9) is coaxially fixedly connected to a rotating rod (12) rotatably connected to the rotating ring (4); a bevel gear plate (13) meshing with the bevel gear ring (11) is coaxially fixedly connected to the rotating rod (12); a connecting ring (14) is fixedly connected to the side of the bevel gear ring (11); and a transmission member for driving the connecting ring (14) to rotate is provided in the housing (1).

4. A gas pipeline detection device according to claim 2, characterized in that: The control component comprises a first connecting tube (15) and a second connecting tube (16) fixedly mounted on the rotating ring (4); a collecting tube (17) connected to the collecting hole (6) is provided in each of the two groups of the detection rods (5); the sliding groove (8) is used to store hydraulic oil; the two groups of the collecting tubes (17) are respectively movably sleeved with the outer walls of the first connecting tube (15) and the second connecting tube (16); one end of the detection rod (5) is rotatably connected to a control ring (18); a tension spring (19) fixedly connected to the sliding groove (8) is fixedly connected to the side of the control ring (18); and a hydraulic component for controlling the hydraulic strength in the sliding groove (8) is provided on the housing (1).

5. A gas pipeline detection device according to claim 4, characterized in that: The conveying member comprises a first annular tube (20) and a second annular tube (21) fixedly mounted in the housing (1); the outer wall of the rotating ring (4) is provided with a first annular groove (22) and a second annular groove (23); the first annular tube (20) is rotatably connected to the inner wall of the first annular groove (22); the second annular tube (21) is rotatably connected to the inner wall of the second annular groove (23); the first annular tube (20) is connected to the first annular groove (22); the second annular tube (21) is connected to the second annular groove (23); the first connecting tube (15) is connected to the first annular groove (22); and the second connecting tube (16) is connected to the second annular groove (23).

6. A gas pipeline detection device according to claim 4, characterized in that: The hydraulic component comprises a third annular tube (24) fixedly mounted in the housing (1); the outer wall of the rotating ring (4) is provided with a third annular groove (25); the third annular tube (24) is rotatably connected to the inner wall of the third annular groove (25); the third annular tube (24) is connected to the third annular groove (25); a hydraulic pipe (26) is connected to the third annular tube (24); two groups of connecting holes (27) for connecting the sliding grooves (8) on both sides with the third annular groove (25); and an adjusting component for controlling the hydraulic strength in the hydraulic pipe (26) is provided in the housing (1).

7. A gas pipeline detection device according to claim 3, characterized in that: The transmission member comprises a drive motor (28) fixedly mounted in the housing (1); an output end of the drive motor (28) is coaxially fixedly connected to a drive shaft (29); a worm (30) is coaxially fixedly connected to the drive shaft (29); and an outer wall of the connecting ring (14) is fixedly connected to a worm wheel ring (31) meshing with the worm (30).

8. A gas pipeline detection device according to claim 6, characterized in that: The adjusting member comprises a hydraulic cylinder (32) fixedly mounted in the housing (1), an electric telescopic rod (33) fixedly connected in the housing (1), a telescopic end of the electric telescopic rod (33) fixedly connected to a hydraulic plate (34) slidably connected to an inner wall of the hydraulic cylinder (32), the hydraulic cylinder (32) being used to store hydraulic oil, and one end of the hydraulic pipe (26) being in communication with the hydraulic cylinder (32).

9. A gas pipeline detection device according to claim 5, characterized in that: The first annular tube (20) and the second annular tube (21) are respectively connected to a detection tube (35) which is connected to an input end of the detector.

10. A gas pipeline detection device according to claim 1, characterized in that: The connecting member comprises a threaded tube (36) rotatably connected to two sides of the housing (1), the threaded tubes (36) on both sides being respectively capable of being threadedly connected to pipes on both sides, and sealing rings (37) are respectively fixedly connected to two sides of the housing (1).

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