An on-line detection and sampling device for natural gas pipelines

Abstract

The present invention relates to the field of natural gas sampling, and specifically to an on-line detection and sampling device for pipelines transporting natural gas, including a pipeline, a bracket is sleeved and adapted on the outer side of the pipeline, a square pipe is rotatably installed on the outer side of the pipeline, and a pipe sleeve is sleeved and adapted on the outer side of the square pipe; a positioning mechanism for deflecting and positioning the square pipe and the pipe sleeve, the positioning mechanism is arranged on the top of the pipeline; holes are formed on the surfaces of both the square pipe and the pipe sleeve. For this on-line detection and sampling device for pipelines transporting natural gas, by arranging multiple groups of sampling pipes and arranging the sampling pipes in a chain form at the same time, it is convenient to sample and store multiple groups of natural gas samples by using multiple groups of collecting sampling pipes, ensuring that when detecting natural gas, by detecting and analyzing multiple groups of natural gas, the influence of accidental factors on the detection results is avoided, and the accuracy of the detection results is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas sampling, and particularly to an on-line detection and sampling device for a pipeline for transporting natural gas. Background Art

[0002] In the prior art, natural gas refers to a class of combustible gases existing in nature, which is a fossil fuel and includes gases formed by various natural processes in the atmosphere, hydrosphere, and lithosphere. After natural gas is mined, it needs to be transported through pipelines. During the transportation process, it is necessary to sample the natural gas. By detecting and analyzing the sampled natural gas, parameters such as the components and density of the natural gas are detected using detection instruments, so as to ensure the safety of the subsequent natural gas in practical applications.

[0003] After retrieval, a patent with the Chinese patent publication number 118329548B discloses an efficient detection device for natural gas sampling, which relates to the technical field of natural gas detection; in order to ensure the accuracy of the detection results; it includes a rotary storage component, a sampling component, and a detection component installed on the top of the natural gas transportation pipeline. A support plate is welded to the top of the natural gas transportation pipeline, and a driving motor is fixed to the outer wall of one side of the support plate by bolts. The output end of the driving motor is fixed with a dial rod by a pin, and one end of the dial rod is slidably connected with a second T-shaped rod. A first spring is fixed between the inner wall of one side of the second T-shaped rod and the end of the dial rod in a clamping manner. In the present invention, by setting multiple groups of collection air bags and setting the sampling disc to be rotary, it is convenient to sample and store multiple groups of natural gas samples using multiple groups of collection air bags, ensuring that when detecting natural gas, by detecting and analyzing multiple groups of natural gas, the influence of accidental factors on the detection results is avoided, and the accuracy of the detection results is improved.

[0004] The above-mentioned efficient detection device for natural gas sampling in the patent has the following deficiencies: during the sampling process, it can only sample and store different batches of samples in one direction on the pipeline, and cannot synchronously sample and store samples in multiple directions on the pipeline. When detecting, only the samples in one direction on the pipeline are detected. When sampling at positions such as pipeline elbows, reduced diameters, or near valves, the distribution of natural gas in the pipeline will change at this time, resulting in incomplete detection results. Summary of the Invention

[0005] The present invention aims to provide an on-line detection and sampling device for a pipeline for transporting natural gas to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: An on-line detection and sampling device for a pipeline for transporting natural gas, including a pipeline, a bracket is sleeved and adapted on the outside of the pipeline, a square pipe is rotatably installed on the outside of the pipeline, and a pipe sleeve is sleeved and adapted on the outside of the square pipe;

[0007] A positioning mechanism for deflecting and positioning the square pipe and the pipe sleeve, the positioning mechanism being arranged at the top of the pipeline;

[0008] Wherein, holes are provided on the surfaces of both the square pipe and the pipe sleeve;

[0009] A sampling mechanism for performing omnidirectional sampling processing on the natural gas inside the pipeline, the sampling mechanism being respectively installed inside the square pipe and the pipe sleeve;

[0010] The positioning mechanism includes a fixed ring, the fixed ring is fixedly connected to the outer side of the pipe sleeve, a compensation ring is fixedly connected to the inner side of the fixed ring, and a sliding bar is fixedly connected to the inner side of the compensation ring;

[0011] One end of the sliding bar away from the compensation ring is slidably fitted with a fixed rail, and counterweight blocks are fixedly installed at both ends of the fixed rail.

[0012] Preferably, one end of the sliding bar away from the compensation ring is extrusion-fitted with a limiting sphere, and the position of the sliding bar is judged and processed by extruding and limiting the central part of the sliding bar by the limiting sphere.

[0013] Preferably, one end of the limiting sphere away from the sliding bar is fixedly connected with a telescopic rod, the telescopic rod is fixedly installed inside the fixed rail, a reset spring is fixedly connected inside the telescopic rod, and the reset spring is used for resetting the telescopic rod;

[0014] One end of the telescopic rod away from the limiting sphere is fixedly connected with a pointer, and the pointer is used for judging whether the center line of the fixed rail is perpendicular.

[0015] Preferably, the sampling mechanism includes a vertical pipe, the vertical pipe is respectively extrusion-fitted on the outer sides of the square pipe and the pipe sleeve, a telescopic collar is fixedly connected to the outer side of the vertical pipe, a motor is fixedly installed at the center of the telescopic collar, the output end of the motor is connected with a gear through a rotating shaft, a rack is meshed and driven on the outer side of the gear, and limiting pieces are respectively slidably fitted on both sides of the rack, and the limiting pieces are fixedly connected to the top end of the vertical pipe.

[0016] Preferably, an inner fixing plate is fixedly connected to the central part inside the vertical pipe, a limiting sliding sleeve is fixedly connected to the outer side of the inner fixing plate, a first stack of sheets is slidably fitted inside the limiting sliding sleeve, the limiting sliding sleeve is used for limiting and guiding the first stack of sheets, and an elastic strip is fixedly connected to the bottom end of the first stack of sheets.

[0017] Preferably, an electric push rod is fixedly connected to the outer side of the vertical pipe, a rope sleeve is fixedly connected to the top end of the electric push rod, and a pull rope is sleeved at the center of the rope sleeve;

[0018] The drawstring is used for outward traction treatment of the first stack of wafers, and one end of the drawstring away from the rope sleeve is fixedly connected to the first stack of wafers.

[0019] Preferably, an external connection plate is fixedly installed on one side of the inner fixing plate away from the limited-slip sleeve. A bottom curved plate is inserted into the top of the external connection plate. A second stack of wafers is arranged directly below the bottom curved plate. The bottom of the second stack of wafers is fixedly connected to a hollow frame;

[0020] A slider is slidably fitted inside the hollow frame. A spring is fixedly connected to the bottom of the slider. One end of the spring away from the slider is fixedly connected to the hollow frame.

[0021] Preferably, one end of the slider away from the hollow frame is fixedly connected to an embedded plate. The top of the embedded plate is in pressing fit with the bottom of the bottom curved plate. A first magnetic block is fixedly connected to the outside of the embedded plate;

[0022] A toughness piece is fixedly connected to the bottom of the inner cavity of the hollow frame.

[0023] Preferably, a sampling tube is fixedly connected to the bottom end of the hollow frame;

[0024] An inclined panel, which is used for one-way conveying treatment of the natural gas entering the sampling tube and is fixedly connected inside the sampling tube;

[0025] A blocking door is rotatably installed on the outside of the sampling tube. A second magnetic block is fixedly connected to the outside of the blocking door.

[0026] Preferably, there is a repulsive relationship between the second magnetic block and the first magnetic block. One end of each of the two ends of the blocking door is symmetrically connected to a first square plate. A reset strip is fixedly connected to the outside of the first square plate. One end of the reset strip away from the first square plate is fixedly connected to a second square plate. The second square plates are symmetrically connected to both ends of the sampling tube.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. When the drilling is completed and the drilling equipment is removed, quickly rotate the pipe sleeve clockwise or counterclockwise, so that the holes respectively opened on the pipe sleeve and the square pipe will be staggered, thereby preventing the natural gas in the pipeline from overflowing outward, avoiding affecting the environment and causing waste of resources.

[0029] 2. The first stack of wafers at the tail end is squeezed downward by the rack. At the same time, the electric push rod is activated, causing the rope sleeve connected to its top to move upward with the pulling rope. The other end of the pulling rope is first connected to the first stack of wafers at the front end. Therefore, under the downward push of the rack and the upward pull of the pulling rope, the first stack of wafers is sequentially conveyed and guided for movement processing.

[0030] 3. A part of the natural gas flowing inside the pipeline will enter the sampling tube through the sealing door, thereby playing a role in sampling the natural gas. The inclined panel fixedly connected inside the sampling tube serves to prevent the natural gas entering the sampling tube from flowing back due to inertia and eliminates the tendency of the natural gas to discharge outward.

[0031] 4. Multiple sets of sampling tubes are provided, and the sampling tubes are arranged in a chain form, so as to facilitate sampling and storing multiple sets of natural gas samples by using multiple sets of sampling tubes. When detecting natural gas, by detecting and analyzing multiple sets of natural gas, the influence of accidental factors on the detection results is avoided, and the accuracy of the detection results is improved.

[0032] 5. In addition, the device can also sample natural gas at positions such as elbows, reducers or near valves in the pipeline. The device is arranged on the pipeline in a circumferential array form, so it can accurately reflect the true situation of the overall natural gas in the pipeline.

[0033] 6. When the inner diameter of the pipeline is small, a part of the device, such as the sampling mechanism, can also be used for detection. When the inner diameter of the pipeline is large, the device can be added for comprehensive detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic external structure diagram of an on-line detection and sampling device for a natural gas transportation pipeline according to the present invention.

[0035] Figure 2 It is a schematic full-sectional structure diagram of the whole of the present invention.

[0036] Figure 3 It is a schematic structure diagram of some components of the present invention.

[0037] Figure 4 It is a schematic structure diagram of the positioning mechanism of the present invention.

[0038] Figure 5 It is a schematic cross-sectional structure diagram of the positioning mechanism of the present invention.

[0039] Figure 6 It is for the present invention Figure 5 The enlarged schematic structure diagram at A in.

[0040] Figure 7This is a schematic structural diagram of the sampling mechanism of the present invention.

[0041] Figure 8 This is a full-sectional structural diagram of the sampling mechanism of the present invention.

[0042] Figure 9 This is an enlarged sectional structural diagram of some components of the sampling mechanism of the present invention.

[0043] Figure 10 This is a side view structural diagram of some components of the sampling mechanism of the present invention.

[0044] Figure 11 This is a vertical sectional structural diagram of some components of the sampling mechanism of the present invention.

[0045] Figure 12 For the present invention Figure 11 An enlarged structural diagram of part B in

[0046] In the figure: 1, pipeline; 2, bracket; 3, square pipe; 4, pipe sleeve; 5, positioning mechanism; 6, sampling mechanism; 51, fixing ring; 52, compensating ring; 53, sliding bar; 54, fixing rail; 55, counterweight; 56, limiting sphere; 57, telescopic rod; 58, return spring; 59, pointer; 61, vertical pipe; 62, telescopic collar; 63, motor; 64, gear; 65, rack; 66, limiting piece; 67, inner fixing plate; 68, anti-slip sleeve; 69, first stack of sheets; 60, elastic strip; 601, pulling rope; 602, rope sleeve; 603, electric push rod; 604, external connecting plate; 605, bottom curved plate; 606, second stack of sheets; 607, hollow frame; 608, slider; 609, spring; 600, embedded plate; 71, first magnetic block; 72, sampling pipe; 73, inclined panel; 74, resilient sheet; 75, blocking door; 76, second magnetic block; 77, first square plate; 78, return strip; 79, second square plate. Detailed implementation manners

[0047] Next, in combination with the accompanying drawings and specific implementation manners, the present invention will be further described. It should be noted that, on the premise of non-conflict, any combination of the following-described embodiments or technical features can form a new embodiment. It should be known that the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0048] Please refer to Figures 1 to 12 , the present invention provides a technical solution: as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 andFigure 6 As shown in the figure, it includes a pipeline 1. A bracket 2 is sleeved and adapted on the outer side of the pipeline 1. A square pipe 3 is rotatably installed on the outer side of the pipeline 1. A pipe sleeve 4 is sleeved and adapted on the outer side of the square pipe 3;

[0049] A positioning mechanism 5 for deflecting and positioning the square pipe 3 and the pipe sleeve 4 is provided on the top of the pipeline 1;

[0050] Holes are provided on the surfaces of both the square pipe 3 and the pipe sleeve 4;

[0051] A sampling mechanism 6 for comprehensively sampling and processing the natural gas inside the pipeline 1 is installed inside the square pipe 3 and the pipe sleeve 4 respectively. When the positions of the pipe sleeve 4 and the positioning mechanism 5 are determined, an external drilling device is passed through the holes on the square pipe 3 and the pipe sleeve 4 in sequence, and then drilling treatment is carried out on the pipeline 1. When the drilling is completed and the drilling device is taken away, the pipe sleeve 4 is quickly rotated clockwise or counterclockwise, so that the holes respectively provided on the pipe sleeve 4 and the square pipe 3 will be staggered, thus preventing the natural gas in the pipeline 1 from overflowing outward, avoiding affecting the environment and causing waste of resources. After the subsequent sampling is completed, the pipe sleeve 4 and the square pipe 3 are still placed at this position to seal the drilled pipeline.

[0052] The positioning mechanism 5 includes a fixing ring 51. The fixing ring 51 is fixedly connected to the outer side of the pipe sleeve 4. A compensation ring 52 is fixedly connected to the inner side of the fixing ring 51. A sliding bar 53 is fixedly connected to the inner side of the compensation ring 52; The square pipe 3 is sleeved on the pipeline 1, and then the pipe sleeve 4 is sleeved on the square pipe 3. Immediately afterwards, the positioning mechanism 5 fixedly installed on the outer side of the pipe sleeve 4 will move to the top of the pipeline 1, where the counterweight 55 will contact the top of the pipeline 1. Subsequently, the operator adjusts the position of the entire positioning mechanism 5 through the indication of the pointer 59, so that the top of the pipe sleeve 4 is flush with the horizontal plane.

[0053] A fixing rail 54 is slidably adapted to the end of the sliding bar 53 far from the compensation ring 52. Counterweights 55 are fixedly installed at both ends of the fixing rail 54; The counterweight 55 plays a role in increasing the overall gravity of the positioning mechanism 5, avoiding the deviation of the positioning mechanism 5 caused by slight external shaking or vibration generated by the operation of the equipment.

[0054] A limiting sphere 56 is extrusion-fitted to the end of the sliding bar 53 far from the compensation ring 52. By extruding and limiting the central part of the sliding bar 53 through the limiting sphere 56, the position of the sliding bar 53 can be judged and processed;

[0055] One end of the limiting sphere 56 away from the sliding bar 53 is fixedly connected with a telescopic rod 57. The telescopic rod 57 is fixedly installed inside the fixed rail 54. A return spring 58 is fixedly connected inside the telescopic rod 57, and the return spring 58 is used for resetting the telescopic rod 57. Additionally, during the clockwise rotation of the sleeve 4, the fixed ring 51 fixedly connected to its outer side will drive the sliding bar 53 to deflect clockwise along the fixed rail 54 through the compensation ring 52. At this time, the limiting sphere 56 connected to the telescopic rod 57 will separate from the sliding bar 53, and the sliding bar 53 will move to the rightmost end of the fixed rail 54. Then the operator first passes the sampling mechanism 6 through the sleeve 4, and then rotates the sleeve 4 counterclockwise to reset. At this time, the sliding bar 53 will squeeze the limiting sphere 56 during the reset process, causing the return spring 58 inside the telescopic rod 57 to compress. Until the limiting sphere 56 and the central part of the sliding bar 53 are on the same vertical line, the return spring 58 will stretch and drive the limiting sphere 56 to embed into the central part of the sliding bar 53, thereby indirectly playing a role in positioning the sleeve 4 during the return process, so that the top of the deflected and reset sleeve 4 is still flush with the horizontal plane. Finally, the sampling mechanism 6 is passed through the square tube 3.

[0056] One end of the telescopic rod 57 away from the limiting sphere 56 is fixedly connected with a pointer 59. The pointer 59 is used for judging whether the center line of the fixed rail 54 is perpendicular. The pointer 59 plays a role in adjusting the position of the positioning mechanism 5 so that its central vertical line is on the same vertical plane as the vertical line.

[0057] As Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 As shown in

[0058] , the sampling mechanism 6 includes a vertical tube 61. The vertical tube 61 is respectively squeezed and adapted to the outer sides of the square tube 3 and the sleeve 4. A telescopic collar 62 is fixedly connected to the outer side of the vertical tube 61. Additionally, the telescopic collar 62 can be extended so that the gear 64 is disengaged from the rack 65 and the sampling process is terminated. A motor 63 is fixedly installed at the central part of the telescopic collar 62. The output end of the motor 63 is connected with a gear 64 through a rotating shaft. A rack 65 is meshed and driven on the outer side of the gear 64. Limiting pieces 66 are respectively slidably adapted on both sides of the rack 65. The limiting pieces 66 are fixedly connected to the top end of the vertical tube 61.There is an inner fixing plate 67 fixedly connected to the central part inside the vertical pipe 61. A limited-slip sleeve 68 is fixedly connected to the outside of the inner fixing plate 67. A first laminated sheet 69 is slidably fitted inside the limited-slip sleeve 68. The limited-slip sleeve 68 is used for limiting and guiding the first laminated sheet 69. An elastic strip 60 is fixedly connected to the bottom end of the first laminated sheet 69. Before the sampling mechanism 6 passes through the pipe sleeve 4 and the square pipe 3 in sequence, a number of first laminated sheets 69 need to pass through the limited-slip sleeve 68 in sequence. Each of the first laminated sheets 69 is connected by an elastic strip 60. The front first laminated sheet 69 is connected to the pull rope 601. Eventually, the first laminated sheet 69 will migrate along the surface of the inner fixing plate 67. The limited-slip sleeve 68 plays a role in moving and guiding the first laminated sheet 69 and preventing the first laminated sheet 69 from falling off. In addition, when the first laminated sheet 69 moves from the vertical plane of the inner fixing plate 67 to the horizontal plane at the corner, the first laminated sheet 69 will bend to a certain extent. At the same time, the bottom corner part of the inner fixing plate 67 is a curved surface to facilitate the smooth cornering of the first laminated sheet 69.

[0059] An electric push rod 603 is fixedly connected to the outside of the vertical pipe 61. A rope sleeve 602 is fixedly connected to the top end of the electric push rod 603. A pull rope 601 is sleeved at the central part of the rope sleeve 602. After the sampling mechanism 6 is adjusted properly, it passes through the pipe sleeve 4 and the square pipe 3 in sequence and contacts the inner cavity of the pipeline 1. At this time, the motor 63 is started, and the gear 64 connected to its output end through a rotating shaft will rotate forward. The rack 65 meshing with the gear 64 will move downward along the limiting piece 66 and squeeze the last first laminated sheet 69 downward. At the same time, the electric push rod 603 is started, so that the rope sleeve 602 connected to its top end will drive the pull rope 601 to move upward. The other end of the pull rope 601 is first connected to the front first laminated sheet 69. Therefore, under the downward push of the rack 65 and the upward pull of the pull rope 601, it plays a role in sequentially conveying and guiding the movement of the first laminated sheet 69.

[0060] The pull rope 601 is used for outward traction of the first laminated sheet 69. The end of the pull rope 601 away from the rope sleeve 602 is fixedly connected to the first laminated sheet 69.

[0061] An external connection plate 604 is fixedly installed on the side of the inner fixing plate 67 away from the limited-slip sleeve 68. A bottom curved plate 605 is inserted into the top of the external connection plate 604. A second laminated sheet 606 is arranged directly below the bottom curved plate 605. A hollow frame 607 is fixedly connected to the bottom of the second laminated sheet 606.

[0062] Inside the hollow frame 607, a slider 608 is slidably fitted. A spring 609 is fixedly connected to the bottom of the slider 608, and the end of the spring 609 away from the slider 608 is fixedly connected to the hollow frame 607. When the second stack 606 is to move away from the bottom curved plate 605, since the bottom of the bottom curved plate 605 is a curved surface, the second stack 606 will squeeze the bottom curved plate 605, causing the bottom curved plate 605 to reset upward until it is limited again by the first stack 69. At the same time, the embedded plate 600 will be retracted into the hollow frame 607 under the action of the spring 609. In addition, the blocking door 75 will block the sampling tube 72 under the action of the reset strip 78, and the reset strip 78 is elastic.

[0063] One end of the slider 608 away from the hollow frame 607 is fixedly connected to an embedded plate 600. The top of the embedded plate 600 is in extrusion fit with the bottom of the bottom curved plate 605, and a first magnetic block 71 is fixedly connected to the outside of the embedded plate 600. Among the first stacks 69, there are several second stacks 606 interspersed. A hole is provided in the central part of the second stack 606, and the outside of the second stack 606 is connected to the hollow frame 607. Therefore, when the second stack 606 moves to directly below the external plate 604, the bottom curved plate 605 inside the external plate 604 will pass through the hole in the second stack 606 and squeeze the embedded plate 600. Initially, the bottom curved plate 605 is always limited by the first stack 69 and cannot move downward from the inside of the external plate 604. The embedded plate 600 squeezed by the bottom curved plate 605 will move downward along the inner wall of the hollow frame 607 through the slider 608 and compress the spring 609. The spring 609 plays a role in resetting the slider 608 and the embedded plate 600.

[0064] A resilient piece 74 is fixedly connected to the bottom of the inner cavity of the hollow frame 607;

[0065] The bottom end of the hollow frame 607 is fixedly connected to a sampling tube 72;

[0066] An inclined panel 73, which is used for one-way conveying of the natural gas entering the sampling tube 72, and is fixedly connected inside the sampling tube 72;

[0067] A sealing door 75 is rotatably installed on the outer side of the sampling pipe 72, and a second magnetic block 76 is fixedly connected to the outer side of the sealing door 75; during the downward movement of the embedded plate 600, the resilient sheet 74 will be squeezed. The resilient sheet 74 has a magnetic blocking effect and serves to isolate the hollow frame 607 and the sampling pipe 72 into two chambers. In addition, a first magnetic block 71 is fixedly connected to the outer side of the embedded plate 600. Therefore, the embedded plate 600 will bring the first magnetic block 71 into the interior of the sampling pipe 72. The first magnetic block 71 and the second magnetic block 76 maintain a repulsive relationship. Therefore, under the action of the repulsive force between the two, the sealing door 75 connected to the second magnetic block 76 will deflect outward. At this time, a part of the natural gas flowing in the pipeline 1 will enter the sampling pipe 72 through the sealing door 75, thereby playing a role in sampling and treating the natural gas. The inclined panel 73 fixedly connected inside the sampling pipe 72 serves to prevent the natural gas entering the sampling pipe 72 from flowing back due to inertia and eliminate the tendency of the natural gas to discharge outward.

[0068] The second magnetic block 76 and the first magnetic block 71 maintain a repulsive relationship. Both ends of the sealing door 75 are symmetrically connected with first square plates 77. A reset strip 78 is fixedly connected to the outer side of the first square plate 77. One end of the reset strip 78 away from the first square plate 77 is fixedly connected to a second square plate 79, and the second square plate 79 is symmetrically connected to both ends of the sampling pipe 72.

[0069] When the present invention is in use: First, the square pipe 3 is sleeved on the pipeline 1, then the pipe sleeve 4 is sleeved on the square pipe 3. Immediately afterwards, the positioning mechanism 5 fixedly installed on the outer side of the pipe sleeve 4 will move to the top of the pipeline 1, where the counterweight 55 will come into contact with the top of the pipeline 1. Subsequently, the operator adjusts the position of the entire positioning mechanism 5 according to the indication of the pointer 59, so that the top of the pipe sleeve 4 is flush with the horizontal plane. When the positions of the pipe sleeve 4 and the positioning mechanism 5 are determined, an external drilling device is passed through the holes on the square pipe 3 and the pipe sleeve 4 in sequence, and then drilling treatment is carried out on the pipeline 1. When the drilling is completed and the drilling device is removed, the pipe sleeve 4 is quickly rotated clockwise or counterclockwise, so that the holes respectively formed on the pipe sleeve 4 and the square pipe 3 will be staggered. Additionally, during the clockwise rotation of the pipe sleeve 4, the fixed ring 51 fixedly connected to its outer side will drive the sliding bar 53 to deflect clockwise along the fixed rail 54 through the compensation ring 52. At this time, the limiting sphere 56 connected to the telescopic rod 57 will separate from the sliding bar 53, and the sliding bar 53 will move to the rightmost end of the fixed rail 54. Then the operator passes the sampling mechanism 6 through the pipe sleeve 4 first, and then rotates the pipe sleeve 4 counterclockwise to reset. At this time, the sliding bar 53 will squeeze the limiting sphere 56 during the reset process, causing the reset spring 58 inside the telescopic rod 57 to be compressed. Until the limiting sphere 56 and the central part of the sliding bar 53 are on the same vertical line, the reset spring 58 will stretch and drive the limiting sphere 56 to embed into the central part of the sliding bar 53.

[0070] Before the sampling mechanism 6 passes through the pipe sleeve 4 and the square pipe 3 in sequence, a number of first laminations 69 need to be passed through the anti-slip sleeve 68 in sequence. Each of the first laminations 69 is connected by an elastic strip 60, and the front first lamination 69 is connected to the pull rope 601. Eventually, the first laminations 69 will migrate along the surface of the inner fixing plate 67. Additionally, during the cornering process of the first lamination 69 from the vertical plane of the inner fixing plate 67 to the horizontal plane, the first lamination 69 will bend to a certain extent. At the same time, the bottom corner part of the inner fixing plate 67 is a curved surface to facilitate the smooth cornering of the first lamination 69.

[0071] After all adjustments of the sampling mechanism 6 are completed, it passes through the tube sleeve 4 and the square tube 3 in sequence and contacts the inner cavity of the pipeline 1. At this time, the motor 63 is started, and the gear 64 connected to its output end through the rotating shaft will rotate forward. The rack 65 meshing with the gear 64 will move downward along the limiting piece 66 and squeeze the first stack of sheets 69 at the tail end. At the same time, the electric push rod 603 is started, and the rope sleeve 602 connected to its top end will drive the pull rope 601 to move upward. One end of the pull rope 601 is first connected to the first stack of sheets 69 at the front end. Therefore, under the downward push of the rack 65 and the upward pull of the pull rope 601. There are several second stack of sheets 606 sandwiched between the first stack of sheets 69. A hole is provided in the central part of the second stack of sheets 606, and the outside of the second stack of sheets 606 is connected to the hollow frame 607. Therefore, when the second stack of sheets 606 moves to directly below the external connection plate 604, the bottom curved plate 605 inside the external connection plate 604 will pass through the hole in the second stack of sheets 606 and squeeze the embedded plate 600. The bottom curved plate 605 was initially restricted by the first stack of sheets 69 and could not move downward from the inside of the external connection plate 604. The embedded plate 600 squeezed by the bottom curved plate 605 will move downward along the inner wall of the hollow frame 607 through the slider 608 and compress the spring 609. During the downward movement of the embedded plate 600, it will squeeze the resilient piece 74. In addition, a first magnetic block 71 is fixedly connected to the outside of the embedded plate 600. Therefore, the embedded plate 600 will bring the first magnetic block 71 into the inside of the sampling tube 72. There is a repulsive relationship between the first magnetic block 71 and the second magnetic block 76. Therefore, under the action of the repulsive force between the two, the blocking door 75 connected to the second magnetic block 76 will deflect outward. At this time, a part of the natural gas flowing inside the pipeline 1 will enter the sampling tube 72 through the blocking door 75 for sampling treatment of the natural gas.

[0072] When the second stack of sheets 606 is about to move away from the bottom curved plate 605, the bottom of the bottom curved plate 605 is a curved surface. Therefore, the second stack of sheets 606 will squeeze the bottom curved plate 605, causing the bottom curved plate 605 to reset upward until it is restricted by the first stack of sheets 69 again. At the same time, the embedded plate 600 will be retracted into the hollow frame 607 under the action of the spring 609. In addition, the blocking door 75 will also block the sampling tube 72 under the action of the reset strip 78. The reset strip 78 is elastic.

[0073] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Those of ordinary skill in the art, starting from the above concepts and without creative labor, make various changes that fall within the scope of protection of the present invention.

Claims

1. An on-line detection and sampling device for a natural gas pipeline, characterized in that, Including: A pipeline, a bracket is sleeved and adapted on the outer side of the pipeline, a square pipe is rotatably installed on the outer side of the pipeline, and a pipe sleeve is sleeved and adapted on the outer side of the square pipe; A positioning mechanism for deflecting and positioning the square pipe and the pipe sleeve, and the positioning mechanism is arranged on the top of the pipeline; Wherein holes are formed on the surfaces of both the square pipe and the pipe sleeve; A sampling mechanism for performing omnidirectional sampling processing on the natural gas inside the pipeline, and the sampling mechanism is respectively installed inside the square pipe and the pipe sleeve; Wherein the positioning mechanism includes a fixed ring, the fixed ring is fixedly connected to the outer side of the pipe sleeve, a compensation ring is fixedly connected to the inner side of the fixed ring, and a sliding strip is fixedly connected to the inner side of the compensation ring; One end of the sliding strip away from the compensation ring is slidably adapted to a fixed rail, and counterweights are fixedly installed at both ends of the fixed rail; One end of the sliding strip away from the compensation ring is squeezed and adapted to a limiting sphere, and the position of the sliding strip is judged and processed by the extrusion and limitation of the center part of the sliding strip by the limiting sphere; One end of the limiting sphere away from the sliding strip is fixedly connected to a telescopic rod, the telescopic rod is fixedly installed inside the fixed rail, a reset spring is fixedly connected inside the telescopic rod, and the reset spring is used for the reset processing of the telescopic rod; One end of the telescopic rod away from the limiting sphere is fixedly connected to a pointer, and the pointer is used for judging whether the center line of the fixed rail is perpendicular; 2. The on-line detection and sampling device for a natural gas pipeline according to claim 1, characterized in that: The sampling mechanism includes a vertical pipe, the vertical pipe is respectively squeezed and adapted to the outer sides of the square pipe and the pipe sleeve, a telescopic collar is fixedly connected to the outer side of the vertical pipe, a motor is fixedly installed at the center part of the telescopic collar, the output end of the motor is connected to a gear through a rotating shaft, a rack is meshed and driven on the outer side of the gear, and limiting pieces are respectively slidably adapted to both sides of the rack, and the limiting pieces are fixedly connected to the top end of the vertical pipe; 3. An on-line detection and sampling device for a natural gas pipeline according to claim 2, characterized in that: A fixed inner plate is fixedly connected to the center part inside the vertical pipe, a limited sliding sleeve is fixedly connected to the outer side of the fixed inner plate, a first laminated sheet is slidably adapted inside the limited sliding sleeve, and the limited sliding sleeve is used for the limiting and guiding processing of the first laminated sheet, and an elastic strip is fixedly connected to the bottom end of the first laminated sheet; 4. The on-line detection and sampling device for a natural gas pipeline according to claim 3, characterized in that: An electric push rod is fixedly connected to the outer side of the vertical pipe, a rope sleeve is fixedly connected to the top end of the electric push rod, and a pull rope is sleeved at the center part of the rope sleeve; Wherein the pull rope is used for pulling the first laminated sheet outwards, and one end of the pull rope away from the rope sleeve is fixedly connected to the first laminated sheet; 5. An on-line detection and sampling device for a natural gas pipeline according to claim 3, characterized in that: An external connection plate is fixedly installed on one side of the fixed inner plate away from the limited sliding sleeve, a bottom curved plate is inserted into the top of the external connection plate, a second laminated sheet is arranged directly below the bottom curved plate, and a hollow frame is fixedly connected to the bottom of the second laminated sheet; A slider is slidably adapted inside the hollow frame, a spring is fixedly connected to the bottom of the slider, and one end of the spring away from the slider is fixedly connected to the hollow frame; 6. The on-line detection and sampling device for a natural gas pipeline according to claim 5, characterized in that: One end of the slider away from the hollow frame is fixedly connected to an embedded plate, the top of the embedded plate is squeezed and adapted to the bottom of the bottom curved plate, and a first magnetic block is fixedly connected to the outer side of the embedded plate; A resilient piece is fixedly connected to the bottom of the inner cavity of the hollow frame.

7. An on-line detection and sampling device for a natural gas pipeline according to claim 5, characterized in that: The bottom end of the hollow frame is fixedly connected with a sampling pipe; An inclined panel, which is used for unidirectional conveying treatment of the natural gas entering the interior of the sampling pipe, and is fixedly connected inside the sampling pipe; A blocking door is rotatably installed on the outer side of the sampling pipe, and a second magnetic block is fixedly connected to the outer side of the blocking door.

8. An on-line detection sampling device for a natural gas pipeline according to claim 7, characterized in that: There is a repulsive relationship between the second magnetic block and the first magnetic block. One side plate is symmetrically connected to both ends of the blocking door. A reset strip is fixedly connected to the outer side of the one side plate. The end of the reset strip away from the one side plate is fixedly connected with a second side plate, and the second side plates are symmetrically connected to both ends of the sampling pipe.

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