CN218408927U

CN218408927U - Butt joint connecting device for natural gas conveying pipeline

Info

Publication number: CN218408927U
Application number: CN202222857672.7U
Authority: CN
Inventors: 王文友
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-01-31
Anticipated expiration: 2032-10-28

Abstract

The utility model discloses a be used for natural gas transmission pipeline to dock connecting device, including installing the connecting device body on first pipeline and second pipeline, the connecting device body includes that the screw sleeve establishes the mounting box on first pipeline, and the left side of mounting box is established to the opening, first pipeline's left end bonds and is fixed with the sealing washer. The utility model discloses an elasticity clamps the setting of mechanism, can realize the sealing connection between first pipeline and the second pipeline fast through the mode of simple pulling, make things convenient for personnel to operate, and the work efficiency is improved, through the setting of gaseous detection alarm mechanism, can take place when leaking in first pipeline and second pipeline junction, in time report to the police and remind personnel, make things convenient for personnel in time to discover, and through screw thread actuating mechanism's setting, can take place when leaking in the junction, in time carry out emergency treatment, reduce the loss that gaseous a large amount of leakage caused.

Description

Butt joint connecting device for natural gas conveying pipeline

Technical Field

The utility model relates to a pipeline butt joint equipment technical field especially relates to a be used for natural gas conveying pipeline butt joint device.

Background

The natural gas pipeline transportation has the advantages of low transportation cost, small occupied area, quick construction, large oil and gas transportation amount, high safety performance, low transportation loss and the like, and the natural gas pipeline is formed by connecting and matching a plurality of sections of straight pipes due to a longer transportation route; the mutual lock of ring flange then is adopted usually to its natural gas conveying pipeline's junction to realize fixed cooperation with the mode of a plurality of bolt locking, this kind of cooperation mode operation is comparatively loaded down with trivial details, makes the installation effectiveness low, can not satisfy the user demand, synthesizes above-mentioned condition, therefore we have provided one kind and have been used for natural gas conveying pipeline butt joint connecting device to be used for solving above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a butt joint device for a natural gas conveying pipeline.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a butt-joint connecting device for natural gas conveying pipelines comprises a connecting device body arranged on a first conveying pipeline and a second conveying pipeline, wherein the connecting device body comprises a mounting box sleeved on the first conveying pipeline in a threaded manner, the left side of the mounting box is provided with an opening, a sealing ring is fixedly bonded at the left end of the first conveying pipeline, the right end of the second conveying pipeline extends into the mounting box and is in close contact with the left side of the sealing ring, the first conveying pipeline and the second conveying pipeline are in sealed connection through the sealing ring, a circular ring which is movably sleeved on the second conveying pipeline in a sealed manner is movably sleeved in the mounting box, clamping grooves are respectively formed in the top and the bottom of the second conveying pipeline, an elastic clamping mechanism is movably clamped in each clamping groove, the second conveying pipeline is fixed through the elastic clamping mechanism, and first grooves are respectively formed in the top and the bottom of the circular ring, the inner walls of the top and the bottom of the mounting box are respectively provided with a first through hole, one side of each of the two elastic clamping mechanisms, which is far away from each other, respectively penetrates through the corresponding first groove and the corresponding first through hole and extends to the outside of the mounting box, the bottoms of the left side and the left side of the mounting box are respectively provided with a rectangular groove which is in cross communication with the corresponding first through hole, a movable plate is sleeved in the rectangular grooves in a sliding manner and can shield and seal the first through holes, the movable plates are sleeved on the corresponding elastic clamping mechanisms in a sliding manner, the inner walls on the right sides of the two rectangular grooves are rotatably provided with the same thread driving mechanism, the two movable plates are both sleeved on the thread driving mechanism in a threaded manner, the thread driving mechanism is used for driving the two movable plates to simultaneously and transversely move so as to drive the elastic clamping mechanisms to transversely move, the right sides of the thread driving mechanisms extend to the right side of the mounting box, and the thread driving mechanisms are sleeved on the first conveying pipeline, the right side of the mounting box is embedded and fixed with a gas detection alarm mechanism, and the gas detection alarm mechanism can timely alarm and remind people when leakage occurs at the joint of the first conveying pipeline and the second conveying pipeline.

Preferably, elasticity clamps the card pole of mechanism including the activity card dress in the draw-in groove, the one end that two card poles kept away from each other runs through corresponding first groove and first through-hole respectively and extends to the mounting box outside and fixedly connected with pull ring, the movable plate slip cap is established on the card pole that corresponds, realize spacing to second pipeline through the card pole, the slip cap is equipped with the fixed block in the first groove, the fixed cover of fixed block is established on the card pole that corresponds, fixedly connected with spring on its open-ended one side inner wall is kept away from in the first groove, one side that two fixed blocks are close to each other respectively with the one end fixed connection that two springs kept away from each other, spring movable sleeve establishes on the card pole that corresponds, the setting of spring, can relax the extrusion force when the spring is in tensile state, the drive fixed block removes and resets.

Preferably, the screw thread actuating mechanism is including rotating the screw rod of installing on two rectangular channel right sides inner walls respectively, movable plate thread bush is established on the screw rod that corresponds, movable plate and screw rod threaded connection's mode, can drive the corresponding movable plate lateral shifting in screw rod pivoted, the right-hand member of screw rod extends to the right side of mounting box, fixed cover is equipped with the belt pulley on the screw rod, the transmission connection has same belt on two belt pulleys, the right-hand member fixedly connected with knob of the screw rod that is located the top, the big bearing of right side fixedly connected with of mounting box, big bearing movable sleeve is established on first pipeline, the inboard of belt and the outer lane outside active contact of big bearing, the cooperation of two belt pulleys and belt, can drive two screw rod synchronous rotations.

Preferably, gaseous detection alarm mechanism is including inlaying the installation pipe of dress fixing on the mounting box right side, the installation pipe is linked together with the inside of mounting box, sealed sliding sleeve is equipped with the piston in the installation pipe, the right side movable contact of piston has the pressure sensor of fixed connection between installation pipe top inner wall and bottom inner wall, pressure sensor's setting, be used for detecting the extrusion force, fixedly connected with audible-visual annunciator on the top inner wall of installation pipe, fixed and electrically connected with controller in audible-visual annunciator's rear side, pressure sensor and controller electric connection, pressure sensor passes through controller and audible-visual annunciator electric connection's mode, can be when pressure sensor detects the extrusion force, control audible-visual annunciator sends audible-visual annunciator and reminds personnel, fixedly connected with battery on the bottom inner wall of installation pipe, battery and pressure sensor and audible-visual annunciator electric connection.

Preferably, the inner side of the circular ring is bonded and sleeved with a first sealing ring, the inner side of the first sealing ring is movably contacted with the outer side of the second conveying pipeline, and the circular ring is hermetically connected with the second conveying pipeline through the first sealing ring.

Preferably, a threaded hole is formed in the inner wall of the right side of the mounting box, an external thread is arranged on the outer side of the first conveying pipeline and meshed with the threaded hole, and the mounting box is matched with the external thread through the threaded hole to achieve connection with the first conveying pipeline.

Preferably, the outer side of the moving plate is in movable contact with the inner wall of the corresponding rectangular groove, and the distance between the front inner wall and the rear inner wall of the rectangular groove is greater than the distance between the front inner wall and the rear inner wall of the first through hole.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the sealing connection between the first conveying pipeline and the second conveying pipeline can be quickly realized through the matching of the mounting box, the sealing ring and the elastic clamping mechanism, the operation of personnel is facilitated, and the working efficiency is improved;

2. through the arrangement of the gas detection alarm mechanism, when leakage occurs at the joint of the first conveying pipeline and the second conveying pipeline, an alarm can be given in time to remind people, so that the people can find the leakage in time conveniently;

3. through the matching of the moving plate and the thread driving mechanism, when leakage occurs at the joint of the first conveying pipeline and the second conveying pipeline, personnel can drive the second conveying pipeline to move rightwards to extrude the sealing ring for emergency treatment, so that the joint of the first conveying pipeline and the second conveying pipeline is sealed again, and the condition of continuous gas leakage can be effectively avoided;

the utility model discloses an elasticity clamps the setting of mechanism, can realize the sealing connection between first pipeline and the second pipeline fast through the mode of simple pulling, make things convenient for personnel to operate, and the operation efficiency is improved, through the setting of gaseous detection alarm mechanism, can be when first pipeline and second pipeline junction take place to leak, in time report to the police and remind personnel, make things convenient for personnel in time to discover, and through screw thread actuating mechanism's setting, can be when the junction takes place to leak, in time carry out emergency treatment, reduce the loss that gaseous a large amount of leakages caused.

Drawings

Fig. 1 is a schematic perspective view of a butt joint device for natural gas pipelines according to the present invention;

fig. 2 is a schematic front view of a butt joint device for natural gas pipelines according to the present invention;

FIG. 3 is an enlarged cross-sectional view of portion A of FIG. 2;

fig. 4 is an enlarged structural view of a portion B in fig. 3.

In the figure: 100. a first delivery conduit; 101. a second delivery conduit; 1. mounting a box; 2. a seal ring; 3. a card slot; 4. a clamping rod; 5. a first groove; 6. a fixed block; 7. a large bearing; 8. a spring; 9. a first through hole; 10. moving the plate; 11. a rectangular groove; 12. a screw; 13. a belt pulley; 14. a belt; 15. installing a pipe; 16. a piston; 17. a pressure sensor; 18. an audible and visual alarm; 19. a circular ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-4, a butt joint connecting device for natural gas conveying pipelines comprises a connecting device body installed on a first conveying pipeline 100 and a second conveying pipeline 101, wherein the connecting device body comprises a mounting box 1 sleeved on the first conveying pipeline 100 in a threaded manner, a threaded hole is formed in the inner wall of the right side of the mounting box 1, an external thread is arranged on the outer side of the first conveying pipeline 100 and meshed with the threaded hole, and is matched with the external thread through the threaded hole to realize quick connection between the first conveying pipeline 100 and the mounting box 1, an opening is formed in the left side of the mounting box 1, a sealing ring 2 is fixedly bonded to the left end of the first conveying pipeline 100, the right end of the second conveying pipeline 101 extends into the mounting box 1 and is in close contact with the left side of the sealing ring 2, and the sealing connection between the second conveying pipeline 101 and the first conveying pipeline 100 is realized through the sealing ring 2;

a ring 19 which is movably sleeved in the mounting box 1 in a sealing manner and movably sleeved on the second conveying pipeline 101 is movably sleeved in the mounting box 1, wherein the outer side of the ring 19 is movably contacted with the inner wall of the mounting box 1, a first sealing ring is bonded and sleeved on the inner side of the ring 19, the inner side of the first sealing ring is movably contacted with the outer side of the second conveying pipeline 101, the sealing connection between the ring 19 and the second conveying pipeline 101 is realized through the first sealing ring, the top and the bottom of the second conveying pipeline 101 are both provided with clamping grooves 3, an elastic clamping mechanism is movably clamped in the clamping grooves 3, the top and the bottom of the ring 19 are both provided with first grooves 5, the inner wall of the top and the inner wall of the bottom of the mounting box 1 are both provided with first through holes 9, the side, far away from each other, of each of the two elastic clamping mechanisms respectively penetrates through the corresponding first groove 5 and the corresponding first through hole 9 and extends to the outside of the mounting box 1, each elastic clamping mechanism comprises a clamping rod 4 which is movably clamped in the corresponding clamping groove 3, one end, far away from each other, of each of the two clamping rods 4 respectively penetrates through the corresponding first groove 5 and the corresponding first through hole 9 and extends to the outside of the mounting box 1 and is fixedly connected with a pull ring, a fixing block 6 is sleeved in each first groove 5 in a sliding mode, the fixing block 6 is fixedly sleeved on the corresponding clamping rod 4, a spring 8 is fixedly connected to the inner wall of the side, far away from the opening of the first groove 5, one side, close to each other, of the two fixing blocks 6 is fixedly connected with one end, far away from each other, of the two springs 8, and the springs 8 are movably sleeved on the corresponding clamping rods 4;

rectangular grooves 11 which are in cross communication with corresponding first through holes 9 are formed in the top of the left side and the bottom of the left side of the mounting box 1, the outer side of a moving plate 10 is in movable contact with the inner wall of the corresponding rectangular groove 11, the distance between the inner wall of the front side and the inner wall of the rear side of the rectangular groove 11 is larger than the distance between the inner wall of the front side and the inner wall of the rear side of the first through hole 9, the corresponding rectangular groove 11 and the first through hole 9 are blocked and shielded by the moving plate 10, the moving plate 10 is sleeved in the rectangular groove 11 in a sliding mode, the moving plate 10 is sleeved on the corresponding clamping rod 4 in a sliding mode, a rectangular hole is formed in the top of the moving plate 10, the inner wall of the rectangular hole is in sliding connection with the outer side of the corresponding clamping rod 4, the same thread driving mechanism is rotatably installed on the inner walls of the right sides of the two rectangular grooves 11, the two moving plates 10 are both sleeved on the thread driving mechanisms, and the right side of the thread driving mechanism extends to the right side of the mounting box 1, the thread driving mechanism is sleeved on the first conveying pipeline 100, wherein the thread driving mechanism comprises screw rods 12 which are respectively rotatably installed on the inner walls of the right sides of two rectangular grooves 11, a circular hole is formed on the inner wall of the right side of each rectangular groove 11, two first bearings are fixedly sleeved in the circular holes, the inner sides of the inner rings of the first bearings are fixedly connected with the outer sides of the corresponding screw rods 12, the first bearings play a role in rotatably installing the corresponding screw rods 12, the movable plate 10 is sleeved on the corresponding screw rods 12 in a threaded manner, the right side of the movable plate 10 is provided with a thread groove which is in threaded connection with the corresponding screw rods 12, the corresponding movable plate 10 can be driven to transversely move while the screw rods 12 rotate in a threaded manner, the right end of each screw rod 12 extends to the right side of the mounting box 1, and belt pulleys 13 are fixedly sleeved on the screw rods 12, the two belt pulleys 13 are in transmission connection with the same belt 14, the right end of the screw 12 positioned above the belt pulleys is fixedly connected with a knob, the right side of the mounting box 1 is fixedly connected with a large bearing 7, the large bearing 7 is movably sleeved on the first conveying pipeline 100, the inner side of the inner ring of the large bearing 7 is in movable contact with the outer side of the first conveying pipeline 100, the left side of the inner ring of the large bearing 7 is fixedly connected with the right side of the mounting box 1, the inner side of the belt 14 is in movable contact with the outer side of the outer ring of the large bearing 7, and the belt 14 is in movable contact with the outer side of the outer ring of the large bearing 7, so that the outer side of the outer ring of the large bearing 7 can be driven to rotate while the belt 14 is in transmission;

a gas detection alarm mechanism is fixedly embedded in the right side of the mounting box 1 and comprises a mounting tube 15 fixedly embedded in the right side of the mounting box 1, the mounting tube 15 is communicated with the inside of the mounting box 1, an embedded hole for connecting the mounting tube 15 is formed in the inner wall of the right side of the mounting box 1, a piston 16 is hermetically and slidably sleeved in the mounting tube 15, a second sealing ring is adhesively sleeved on the outer side of the piston 16, the outer side of the second sealing ring is movably contacted with the inner wall of the mounting tube 15, the piston 16 is hermetically connected with the mounting tube 15 through the second sealing ring, a pressure sensor 17 fixedly connected between the inner wall of the top part and the inner wall of the bottom part of the mounting tube 15 is movably contacted with the right side of the piston 16, the pressure sensor 17 is used for detecting the extrusion force of the piston 16, and an audible and visual alarm 18 is fixedly connected on the inner wall of the top part of the mounting tube 15, the rear side of the audible and visual alarm 18 is fixedly and electrically connected with the controller, the pressure sensor 17 is electrically connected with the controller, the inner wall of the bottom of the mounting pipe 15 is fixedly connected with the storage battery, the storage battery is electrically connected with the pressure sensor 17 and the audible and visual alarm 18, and the storage battery supplies power to the pressure sensor 17 and the audible and visual alarm 18, through the arrangement of the elastic clamping mechanism, the sealed connection between the first conveying pipeline 100 and the second conveying pipeline 101 can be quickly realized through a simple pulling mode, the operation of personnel is convenient, the working efficiency is improved, through the arrangement of the gas detection alarm mechanism, when the leakage occurs at the joint of the first conveying pipeline 100 and the second conveying pipeline 101, the alarm and the reminding personnel can be timely alarmed, the personnel can find the leakage in time, and through the arrangement of the thread driving mechanism, the emergency treatment can be timely carried out when the leakage occurs at the joint, the loss caused by large leakage of gas is reduced.

The working principle is as follows: when the sealing device is used, when the first conveying pipeline 100 and the second conveying pipeline 101 are in an unconnected state and are connected, the mounting box 1 is sleeved on the first conveying pipeline 100 in a threaded manner, two pull rings are pulled in a direction away from each other to drive the two clamping rods 4 to move in a direction away from each other, the clamping rods 4 drive the corresponding fixed blocks 6 to slide in the first grooves 5 and stretch the springs 8, then the second conveying pipeline 101 moves rightwards to the inside of the mounting box 1, when the second conveying pipeline 101 moves rightwards to be in close contact with the left side of the sealing ring 2, the second conveying pipeline 101 is stopped moving, the clamping rods 4 are aligned with the corresponding clamping grooves 3 at the moment, the pulling force on the pull rings is released, the elastic force of the springs 8 in the stretching state drives the clamping rods 4 to move into the clamping grooves 3 through the corresponding fixed blocks 6, the clamping rods 4 are clamped with the corresponding clamping grooves 3, the second conveying pipeline 101 is fixed in the mounting box 1, the sealing connection between the first conveying pipeline 100 and the second conveying pipeline 101 is realized by matching with the arrangement of the sealing ring 2, the quick connection of the first conveying pipeline 100 and the second conveying pipeline 101 by simple pulling, and the quick connection of the conveying pipeline, and the sealing operation of the conveying pipeline 100 are convenient for installation and the installation of the operators;

when the sealing ring 2 is aged and thinned in the using process, a gap is easily generated between the sealing ring 2 and the second conveying pipeline 101 to cause leakage, at the moment, the ring 19 and the mounting box 1 form a sealed space, so that leaked gas enters the sealed space, along with the entering of the gas, the gas in the sealed space enters the mounting pipe 15 to extrude the piston 16, the extruding force drives the piston 16 to move rightwards and extrude the pressure sensor 17, the pressure sensor 17 detects the extruding force of the piston, when the change of the extruding force is detected, the pressure sensor 17 transmits a signal to the controller, the controller controls the audible and visual alarm 18 to be started to send an audible and visual alarm to remind people, and the people can conveniently find the gas in time;

when a person hears an alarm, the knob can be rotated in the forward direction to drive the upper screw 12 to rotate, the upper screw 12 drives the upper belt pulley 13 to rotate, the upper belt pulley 13 drives the lower belt pulley 13 to rotate through a belt 14, the lower belt pulley 13 drives the lower screw 12 to rotate, under the action of a thread groove formed in the movable plate 10, the screw 12 rotates to drive the movable plate 10 to move rightwards, the movable plate 10 drives a circular ring 19 to move rightwards through corresponding clamping rods 4, the two clamping rods 4 also drive the second conveying pipeline 101 to move rightwards at the same time to extrude the sealing ring 2, under the action of extrusion force, the left side of the sealing ring 2 is in close contact with the right end of the second conveying pipeline 101 again, so that the second conveying pipeline 101 is in sealed connection with the first conveying pipeline 100 through the sealing ring 2 again, the condition of continuous gas leakage is avoided, emergency treatment is timely performed when leakage occurs at the connection position, and loss caused by large amount of gas leakage is reduced;

when needs take off second pipeline 101, can be to two pull rings of direction pulling of keeping away from each other, two pull rings drive two kellies 4 and remove to the direction of keeping away from each other, kellies 4 drives fixed block 6 that corresponds and stretches spring 8, kellies 4 shifts out from the draw-in groove 3 that corresponds, remove the fixed to second pipeline 101, can take off second pipeline 101, make things convenient for through the mode of simple pulling, realize the dismouting between first pipeline 100 and the second pipeline 101 fast, make things convenient for personnel's operation, and the installation effectiveness is improved.

In the description of the present application, it should be noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected" and "connected" should be construed broadly, and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediary, and a communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific situations.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A butt-joint connecting device for natural gas conveying pipelines comprises a connecting device body arranged on a first conveying pipeline (100) and a second conveying pipeline (101), the connecting device body comprises a mounting box (1) sleeved on the first conveying pipeline (100) in a threaded manner, the left side of the mounting box (1) is provided with an opening, the butt-joint connecting device is characterized in that the left end of the first conveying pipeline (100) is fixedly bonded with a sealing ring (2), the right end of the second conveying pipeline (101) extends into the mounting box (1) and is in close contact with the left side of the sealing ring (2), a ring (19) sleeved on the second conveying pipeline (101) in a sealing and movable manner is movably sleeved in the mounting box (1), clamping grooves (3) are formed in the top and the bottom of the second conveying pipeline (101), an elastic clamping mechanism is clamped in the clamping grooves (3), first grooves (5) are formed in the top and the bottom of the ring (19), first through holes (9) are formed in the inner walls of the top and the bottom of the mounting box (1), the first through holes (9) are formed in the inner wall and the bottom of the mounting box (1), one side, two elastic clamping mechanisms which are far away from each other, the corresponding first through hole (5) and the mounting box (11) respectively extend into the rectangular grooves (11), a rectangular groove (11), and a moving plate is sleeved in the mounting plate (11), the movable plates (10) are sleeved on the corresponding elastic clamping mechanisms in a sliding mode, the inner walls of the right sides of the two rectangular grooves (11) are rotatably provided with the same thread driving mechanism, the two movable plates (10) are sleeved on the thread driving mechanism in a threaded mode, the right sides of the thread driving mechanisms extend to the right side of the mounting box (1), the thread driving mechanism is sleeved on the first conveying pipeline (100), and the right side of the mounting box (1) is fixedly embedded with a gas detection alarm mechanism.

2. The butt joint connecting device for the natural gas conveying pipeline is characterized in that the elastic clamping mechanism comprises clamping rods (4) movably clamped in clamping grooves (3), one ends, far away from each other, of the two clamping rods (4) penetrate through corresponding first grooves (5) and first through holes (9) respectively and extend out of the mounting box (1) and are fixedly connected with pull rings, a moving plate (10) is sleeved on the corresponding clamping rods (4) in a sliding mode, fixing blocks (6) are sleeved in the first grooves (5) in the sliding mode, the fixing blocks (6) are fixedly sleeved on the corresponding clamping rods (4), springs (8) are fixedly connected to the inner wall of one side, far away from openings, of the first grooves (5), one sides, close to each other, of the two fixing blocks (6) are fixedly connected with one ends, far away from each other, of the two springs (8), and the springs (8) are movably sleeved on the corresponding clamping rods (4).

3. The butt joint connecting device for the natural gas conveying pipelines is characterized in that the thread driving mechanism comprises screw rods (12) which are respectively rotatably installed on the inner walls of the right sides of the two rectangular grooves (11), a movable plate (10) is sleeved on the corresponding screw rods (12) in a threaded manner, the right ends of the screw rods (12) extend to the right side of the mounting box (1), belt pulleys (13) are fixedly sleeved on the screw rods (12), the same belt (14) is connected on the two belt pulleys (13) in a transmission manner, a knob is fixedly connected at the right end of the screw rod (12) positioned above, a large bearing (7) is fixedly connected on the right side of the mounting box (1), the large bearing (7) is movably sleeved on the first conveying pipeline (100), and the inner side of the belt (14) is movably contacted with the outer side of the outer ring of the large bearing (7).

4. The butt joint connection device for the natural gas conveying pipeline is characterized in that the gas detection alarm mechanism comprises a mounting pipe (15) fixedly embedded on the right side of the mounting box (1), the mounting pipe (15) is communicated with the inside of the mounting box (1), a piston (16) is sleeved in the mounting pipe (15) in a sealing and sliding mode, a pressure sensor (17) fixedly connected between the top inner wall and the bottom inner wall of the mounting pipe (15) is movably contacted with the right side of the piston (16), an audible and visual alarm (18) is fixedly connected to the top inner wall of the mounting pipe (15), a controller is fixedly and electrically connected to the rear side of the audible and visual alarm (18), the pressure sensor (17) is electrically connected with the controller, a storage battery is fixedly connected to the bottom inner wall of the mounting pipe (15), and the storage battery is electrically connected with the pressure sensor (17) and the audible and visual alarm (18).

5. The butt joint device for the natural gas conveying pipelines is characterized in that a first sealing ring is bonded and sleeved on the inner side of the circular ring (19), and the inner side of the first sealing ring is movably contacted with the outer side of the second conveying pipeline (101).

6. The butt joint device for the natural gas conveying pipelines is characterized in that a threaded hole is formed in the inner wall of the right side of the mounting box (1), and an external thread is arranged on the outer side of the first conveying pipeline (100) and meshed with the threaded hole.

7. The butt joint device for natural gas transportation pipelines according to claim 1, wherein the outer side of the moving plate (10) is in movable contact with the inner wall of the corresponding rectangular groove (11), and the distance between the front inner wall and the rear inner wall of the rectangular groove (11) is greater than the distance between the front inner wall and the rear inner wall of the first through hole (9).