Pipeline connecting device for natural gas pipeline installation

Abstract

The utility model relates to the technical field of natural gas pipelines, in particular to a pipeline connecting device for natural gas pipeline installation, which comprises a first pipe body, one end of the first pipe body is connected with a second pipe body, and the surface of the joint of the first pipe body and the second pipe body is sleeved with a first sealing half ring and a second sealing half ring. The surface of the first sealing half ring and the surface of the second sealing half ring are fixedly connected with a first fixing shell and a second fixing shell correspondingly, two fixing assemblies are arranged at the joint of the first fixing shell and the second fixing shell, and each fixing assembly comprises a mounting bottom plate; and one face of the mounting bottom plate is fixedly connected with the surface of the first fixing shell, a mounting base is fixedly arranged on the other face of the mounting bottom plate, when the pipeline connecting device is mounted, the first limiting semi-ring and the second limiting semi-ring are closed, and the fixing rod is inserted into an inner cavity of the movable hole and extends to the outer side of the limiting plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas pipeline technical field, specifically is a pipeline connecting device for natural gas pipeline installation. BACKGROUND

[0002] Natural gas pipeline refers to the pipeline that transports natural gas (including associated gas produced in oil field) from mining place or treatment plant to city gas distribution center or industrial enterprise user, also called gas transmission pipeline. It is the main way of transporting natural gas on land, and occupies a considerable proportion in the total length of pipeline in the world.

[0003] When installing natural gas pipeline, pipeline connecting device is needed, but the fixing effect of pipeline connecting device is not good, and the pipelines or the pipelines and the connecting pieces will be loose due to vibration, displacement and other factors, so that natural gas leakage occurs. CONTENT OF UTILITY MODEL

[0004] In view of the deficiency of prior art, the utility model provides a pipeline connecting device for natural gas pipeline installation, which has the advantages of good fixing effect, and solves the problem of poor fixing effect of pipeline connecting device.

[0005] The utility model relates to a pipeline connecting device for natural gas pipeline installation, including first pipe body, one end of first pipe body is connected with second pipe body, the surface of first pipe body and second pipe body junction is equipped with first sealing half ring and second sealing half ring, the surface of first sealing half ring and second sealing half ring is fixedly connected with first fixed casing and second fixed casing respectively, the junction of first fixed casing and second fixed casing is provided with two fixed assemblies, the fixed assembly includes installation bottom plate, one side of installation bottom plate is fixedly connected with the surface of first fixed casing, the other side of installation bottom plate is fixedly provided with mounting seat, one end of mounting seat both sides is fixedly provided with mounting ring, two the fixed setting of mounting ring between connection rod, the surface of connection rod is movably equipped with movable cover, the surface of movable cover is equipped with recess, one side of mounting seat inner chamber is fixedly provided with cylinder, one end of cylinder is movably connected with movable plate, one side of movable plate is fixedly provided with rotating block, one end of movable cover is fixedly provided with clamping rod, the surface of second fixed casing is fixedly provided with mounting plate, the surface of mounting plate is equipped with the clamping hole of cooperation with clamping rod, both ends of movable plate surface all are equipped with round hole, the inner chamber screw thread connection of round hole has fixed bolt, the surface of movable cover is equipped with the screw hole of cooperation with fixed bolt, both ends of first sealing half ring and first fixed casing are fixedly connected with first limit half ring, both ends of second sealing half ring and second fixed casing are fixedly connected with second limit half ring, the junction of first limit half ring and second limit half ring is provided with auxiliary fixed assembly, when installing pipeline connecting device, close first limit half ring and second limit half ring, fixed rod inserts movable hole's inner chamber and extends to the outside of limit plate, then rotates limit rod, and limit rod clamps into the inner chamber of through -hole and limits fixed rod, then covers movable cover, clamping rod clamps into the inner chamber of clamping hole, rotates rotating block, and drives movable plate to rotate through rotating block rotation, when movable plate rotates to round hole and screw hole alignment, rotates fixed bolt again, makes fixed bolt clamps into the inner chamber of screw hole, can limit movable plate, limit movable cover through movable plate, limit clamping rod through movable cover, limit through fixed rod and clamping rod, pipeline connecting device installation is completed when this time, through the cooperation of fixed assembly and auxiliary fixed assembly, increase the fixed stability of pipeline connecting device, avoid the fixed effect of pipeline connecting device to be not good, and the connecting place can be loose because of factors such as vibration, displacement, thereby the natural gas leakage condition appears, when disassembling, first, rotate fixed bolt and remove the limit between fixed bolt and screw hole, then rotate rotating block, and drive movable plate to rotate through rotating block rotation, when movable plate rotates to with recess flush, open movable cover, and drive clamping rod to leave the inner chamber of clamping hole through movable cover opening, clamping rod and clamping hole are limited when this time, remove the limit between first fixed casing and second fixed casing through the removal of limit of clamping rod and clamping hole, then rotate limit rod,The limiting rod is separated from the inner cavity of the through hole, the limiting of the limiting rod to the fixed rod is released, the limiting between the first limiting half ring and the second limiting half ring is released, the limiting between the first fixed shell and the second fixed shell, the first limiting half ring and the second limiting half ring is released, and the pipeline connecting device is disassembled, thereby the pipeline connecting device is maintained, the convenience of the pipeline connecting device maintenance is improved, the maintenance efficiency is improved, and the maintenance cost is reduced.

[0006] The utility model discloses a pipeline connecting device for natural gas pipeline installation, wherein the auxiliary fixing assembly includes a mounting block, one side of the mounting block is fixedly connected with the surface of the first limiting half ring, the surface of the mounting block is fixedly provided with a fixed rod, one end of the fixed rod penetrates through and extends to the outside of the mounting block, the surface of the second limiting half ring is fixedly provided with a hollow block, the inner cavity of the hollow block is fixedly provided with a limiting plate, the surface of the hollow block and the limiting plate is provided with a movable hole matched with the fixed rod, the surface of the fixed rod is provided with a through hole, and the inner cavity of the hollow block is movably connected with a limiting rod matched with the through hole.

[0007] The utility model discloses a pipeline connecting device for natural gas pipeline installation, wherein the number of the auxiliary fixing assembly is four, two auxiliary fixing assemblies are arranged at the connecting place of the first limiting half ring and the second limiting half ring, the fixing effect between the first limiting half ring and the second limiting half ring is improved by arranging four auxiliary fixing assemblies, the fixing effect of the pipeline connecting device is improved, the pipeline connecting device is prevented from loosening, the sealing is prevented from being not strict, and the leakage is prevented.

[0008] The utility model discloses a pipeline connecting device for natural gas pipeline installation, wherein the number of the fixed rod in the four auxiliary fixing assemblies is two, and the two fixed rods are centrally symmetrically arranged about the mounting block, the fixing stability of the auxiliary fixing assembly is improved by arranging two fixed rods in each auxiliary fixing assembly, and the first limiting half ring and the second limiting half ring are prevented from loosening.

[0009] The utility model discloses a pipeline connecting device for natural gas pipeline installation, wherein the number of the first limiting half ring and the second limiting half ring is two, and the two first limiting half rings and the second limiting half rings are sleeved on the surface of the first pipe body and the second pipe body, the fixing effect of the first pipe body and the second pipe body is improved by the cooperation of the first limiting half ring and the second limiting half ring, and the first pipe body and the second pipe body are prevented from loosening.

[0010] The utility model discloses a pipeline connecting device for natural gas pipeline installation, wherein the number of clamping rods and clamping holes in the two fixing assemblies is three, and the three clamping rods and clamping holes are respectively arranged at one end of the movable cover plate and the surface of the mounting plate at equal distances. By arranging three clamping rods and three clamping holes in each fixing assembly, the fixing stability of the fixing assembly is increased, the loosening between the first fixing shell and the second fixing shell is avoided, and the risk of natural gas leakage is reduced.

[0011] Compared with the prior art, the utility model has the beneficial effects as follows:

[0012] 1. When installing the pipeline connecting device, the first limiting half ring and the second limiting half ring are closed, the fixing rod is inserted into the inner cavity of the movable hole and extends to the outside of the limiting plate, then the limiting rod is rotated, the limiting rod is clamped into the inner cavity of the through hole to limit the fixing rod, then the movable cover plate is closed, the clamping rod is clamped into the inner cavity of the clamping hole, the rotating block is rotated, the movable plate is rotated by the rotating block, when the movable plate is rotated to align the circular hole and the threaded hole, the fixing bolt is rotated, the fixing bolt is clamped into the inner cavity of the threaded hole, the movable plate is limited, the movable cover plate is limited by the movable plate, the clamping rod is limited by the movable cover plate, the fixing rod and the clamping rod are limited, at this time, the pipeline connecting device is installed, the fixing stability of the pipeline connecting device is increased by the cooperation of the fixing assembly and the auxiliary fixing assembly, the fixing effect of the pipeline connecting device is not good, the connection part may be loosened due to factors such as vibration and displacement, and the natural gas leakage occurs, when disassembling, the fixing bolt is rotated to release the limiting between the fixing bolt and the threaded hole, then the rotating block is rotated, the movable plate is rotated by the rotating block, when the movable plate is rotated to align the groove, the movable cover plate is opened, the clamping rod is driven out of the inner cavity of the clamping hole by the movable cover plate, at this time, the clamping rod and the clamping hole are released, the limiting between the first fixing shell and the second fixing shell is released by the clamping rod and the clamping hole, then the limiting rod is rotated, the limiting rod is driven out of the inner cavity of the through hole, the limiting of the fixing rod by the limiting rod is released by the limiting rod driven out of the inner cavity of the through hole, the limiting between the first limiting half ring and the second limiting half ring is released by the fixing rod, the pipeline connecting device is disassembled by the limiting release between the first fixing shell and the second fixing shell, the first limiting half ring and the second limiting half ring, the pipeline connecting device is maintained, the convenience of the pipeline connecting device maintenance is increased, the maintenance efficiency is improved, and the maintenance cost is reduced.

[0013] 2. The utility model discloses four auxiliary fixing assemblies, which increase the fixing effect between the first limiting half ring and the second limiting half ring, and further increase the fixing effect of the pipeline connecting device, avoid loosening of the pipeline connecting device, cause the sealing to be not tight, and further cause the leakage.

[0014] The two fixing rods arranged in each auxiliary fixing assembly increase the fixing stability of the auxiliary fixing assembly, and prevent loosening between the first limiting half ring and the second limiting half ring.

[0015] The cooperation of the first limiting half ring and the second limiting half ring increases the fixing effect on the first pipe body and the second pipe body, and avoids loosening of the first pipe body and the second pipe body.

[0016] The three clamping rods and the three clamping holes arranged in each fixing assembly increase the fixing stability of the fixing assembly, avoid loosening between the first fixing shell and the second fixing shell, and reduce the risk of natural gas leakage. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0018] Figure 1 It is a structural schematic view of the present application;

[0019] Figure 2 It is a structural schematic view of the first sealing half ring and the second sealing half ring of the present application;

[0020] Figure 3 It is a structural schematic view of the fixing assembly of the present application;

[0021] Figure 4 It is a structural schematic view of the connection between the cylinder, the movable plate and the rotating block of the present application;

[0022] Figure 5 It is a structural schematic view of the auxiliary fixing assembly of the present application;

[0023] Figure 6 It is a structural schematic view of the internal section of the hollow block of the present application.

[0024] In the drawings: 1, first pipe body; 2, second pipe body; 3, first sealing half ring; 4, second sealing half ring; 5, first fixing shell; 6, second fixing shell; 7, fixing assembly; 701, mounting bottom plate; 702, mounting seat; 703, mounting ring; 704, connecting rod; 705, movable cover plate; 706, groove; 707, cylinder; 708, movable plate; 709, rotating block; 710, clamping rod; 711, mounting plate; 712, clamping hole; 713, round hole; 714, fixing bolt; 715, threaded hole; 8, auxiliary fixing assembly; 801, mounting block; 802, fixing rod; 803, hollow block; 804, limiting plate; 805, through hole; 806, limiting rod; 9, first limiting half ring; 10, second limiting half ring. DETAILED DESCRIPTION

[0025] Many actual implementation details will be described below in the following description for the purpose of illustration. However, it should be understood that these implementation details are not intended to limit the present application. That is, in some embodiments of the present application, these implementation details are not required. In addition, for the purpose of simplicity and clarity, some of the conventional and well-known structures and components are not shown in the drawings so as to avoid confusing the subject matter of the present application.

[0026] Reference will now be made to the drawings, wherein Figures 1-6The utility model discloses a natural gas pipeline installation is with pipeline connecting device, including first pipe body 1, one end of first pipe body 1 is connected with second pipe body 2, and the surface of first pipe body 1 and second pipe body 2 junction is equipped with first sealing half ring 3 and second sealing half ring 4, and the surface of first sealing half ring 3 and second sealing half ring 4 is fixedly connected with first fixed casing 5 and second fixed casing 6 respectively, and the junction of first fixed casing 5 and second fixed casing 6 is provided with two fixed assemblies 7, and fixed assembly 7 includes installation base plate 701, and one side of installation base plate 701 is fixedly connected with the surface of first fixed casing 5, and the other side of installation base plate 701 is fixedly provided with mounting seat 702, and the one end of one side of mounting seat 702 is fixedly provided with mounting ring 703, and the fixed setting of two mounting rings 703 between the fixed setting of connecting rod 704, and the surface of connecting rod 704 is movably equipped with movable cover plate 705, and the surface of movable cover plate 705 is equipped with recess 706, and one side of the inner chamber of mounting seat 702 is fixedly provided with cylinder 707, and one end of cylinder 707 is movably connected with movable plate 708, and one side of movable plate 708 is fixedly provided with rotating block 709, and one end of movable cover plate 705 is fixedly provided with clamping rod 710, and the surface of second fixed casing 6 is fixedly provided with mounting plate 711, and the surface of mounting plate 711 is equipped with the clamping hole 712 of cooperation with clamping rod 710, and both ends of movable plate 708 surface are equipped with round hole 713, and the inner chamber of round hole 713 is screw-threaded with fixed bolt 714, and the surface of movable cover plate 705 is equipped with the threaded hole 715 of cooperation with fixed bolt 714, and both ends of first sealing half ring 3 and first fixed casing 5 are fixedly connected with first limit half ring 9, and both ends of second sealing half ring 4 and second fixed casing 6 are fixedly connected with second limit half ring 10, and the junction of first limit half ring 9 and second limit half ring 10 is provided with auxiliary fixed assembly 8, when installing pipeline connecting device, close first limit half ring 9 and second limit half ring 10, fixed rod 802 is inserted into the inner chamber of movable hole and extends to the outside of limit plate 804, then rotates limit rod 806, limit rod 806 is clamped into the inner chamber of through -hole 805 and is positioned fixed rod 802, then cover movable cover plate 705, clamping rod 710 is clamped into the inner chamber of clamping hole 712, rotates rotating block 709, and movable plate 708 is rotated by rotating block 709, when movable plate 708 rotates to round hole 713 and threaded hole 715 alignment, rotates fixed bolt 714 again, so that fixed bolt 714 is clamped into the inner chamber of threaded hole 715, that is, movable plate 708 can be positioned, and movable plate 708 can be positioned by movable plate 708, and clamping rod 710 can be positioned by movable cover plate 705, and fixed rod 802 and clamping rod 710 are positioned, at this moment, pipeline connecting device installation is completed, and the cooperation of fixed assembly 7 and auxiliary fixed assembly 8 increases the fixed stability of pipeline connecting device, avoids that pipeline connecting device fixed effect is not good, and the connecting place can be loose because of vibration, displacement and other factors,When the natural gas leaks, first, the fixing bolt 714 is rotated to release the limiting between the fixing bolt 714 and the threaded hole 715, then the rotating block 709 is rotated to drive the movable plate 708 to rotate, when the movable plate 708 is flush with the groove 706, the movable cover plate 705 is opened to drive the clamping rod 710 to leave the inner cavity of the clamping hole 712, at this time, the clamping rod 710 and the clamping hole 712 are released from the limiting, the limiting between the first fixed shell 5 and the second fixed shell 6 is released through the release of the limiting of the clamping rod 710 and the clamping hole 712, then the limiting rod 806 is rotated to make the limiting rod 806 leave the inner cavity of the through hole 805, the limiting of the fixing rod 802 by the limiting rod 806 is released through the limiting rod 806 leaving the inner cavity of the through hole 805, the limiting between the first limiting half ring 9 and the second limiting half ring 10 is released through the release of the limiting between the first fixed shell 5 and the second fixed shell 6, the first limiting half ring 9 and the second limiting half ring 10, the pipeline connecting device is disassembled, and then the pipeline connecting device is maintained, the convenience of maintaining the pipeline connecting device is increased, the maintenance efficiency is improved, and the maintenance cost is reduced.

[0027] The auxiliary fixing assembly 8 comprises a mounting block 801, one side of the mounting block 801 is fixedly connected with the surface of the first limiting half ring 9, the surface of the mounting block 801 is fixedly provided with a fixing rod 802, one end of the fixing rod 802 penetrates and extends to the outside of the mounting block 801, the surface of the second limiting half ring 10 is fixedly provided with a hollow block 803, the inner cavity of the hollow block 803 is fixedly provided with a limiting plate 804, the surfaces of the hollow block 803 and the limiting plate 804 are both provided with a movable hole used in cooperation with the fixing rod 802, the surface of the fixing rod 802 is provided with a through hole 805, and the inner cavity of the hollow block 803 is movably connected with a limiting rod 806 used in cooperation with the through hole 805.

[0028] The number of the auxiliary fixing assembly 8 is four, and the four auxiliary fixing assemblies 8 are arranged in two groups at the connection between the first limiting half ring 9 and the second limiting half ring 10, by arranging the four auxiliary fixing assemblies 8, the fixing effect between the first limiting half ring 9 and the second limiting half ring 10 is increased, and then the fixing effect of the pipeline connecting device is increased, so that the pipeline connecting device is prevented from loosening to cause sealing to be not strict and then the leakage occurs.

[0029] The number of the fixing rod 802 in the four auxiliary fixing assemblies 8 is two, and the two fixing rods 802 are centrally symmetrically arranged about the mounting block 801, by arranging two fixing rods 802 in each auxiliary fixing assembly 8, the fixing stability of the auxiliary fixing assembly 8 is increased, and the loosening between the first limiting half ring 9 and the second limiting half ring 10 is prevented.

[0030] The number of the first limiting half rings 9 and the second limiting half rings 10 is two, and the two first limiting half rings 9 and the second limiting half rings 10 are sleeved on the surface of the first pipe body 1 and the second pipe body 2. Through the cooperation of the first limiting half rings 9 and the second limiting half rings 10, the fixing effect of the first pipe body 1 and the second pipe body 2 is increased, and the loosening of the first pipe body 1 and the second pipe body 2 is avoided.

[0031] The number of the clamping rods 710 and the clamping holes 712 in the two fixing assemblies 7 is three, and the three clamping rods 710 and the three clamping holes 712 are respectively arranged at equal distances on one end of the movable cover plate 705 and the surface of the mounting plate 711. By arranging three clamping rods 710 and three clamping holes 712 in each fixing assembly 7, the fixing stability of the fixing assembly 7 is increased, the loosening between the first fixed shell 5 and the second fixed shell 6 is avoided, and the risk of natural gas leakage is reduced.

[0032] When the pipeline connecting device is installed, the first limiting half ring 9 and the second limiting half ring 10 are closed, the fixed rod 802 is inserted into the inner cavity of the movable hole and extends to the outside of the limiting plate 804, then the limiting rod 806 is rotated, the limiting rod 806 is clamped into the inner cavity of the through hole 805 to limit the fixed rod 802, then the movable cover plate 705 is covered, the clamping rod 710 is clamped into the inner cavity of the clamping hole 712, the rotating block 709 is rotated, the movable plate 708 is rotated through the rotation of the rotating block 709, when the movable plate 708 is rotated to align the circular hole 713 and the threaded hole 715, the fixed bolt 714 is rotated again, so that the fixed bolt 714 is clamped into the inner cavity of the threaded hole 715, that is, the movable plate 708 can be limited, the movable cover plate 705 can be limited through the limiting of the movable plate 708, the clamping rod 710 can be limited through the limiting of the movable cover plate 705, the fixed rod 802 and the clamping rod 710 are limited, at this time, the pipeline connecting device is installed, through the cooperation of the fixing assembly 7 and the auxiliary fixing assembly 8, the fixing stability of the pipeline connecting device is increased, the fixing effect of the pipeline connecting device is not good, and the connection part may be loose due to factors such as vibration and displacement, so that natural gas leakage occurs, when disassembling, the fixed bolt 714 is rotated to release the limiting between the fixed bolt 714 and the threaded hole 715, then the rotating block 709 is rotated, the movable plate 708 is rotated through the rotation of the rotating block 709, when the movable plate 708 is rotated to be flush with the groove 706, the movable cover plate 705 is opened, the movable cover plate 705 is opened to drive the clamping rod 710 to leave the inner cavity of the clamping hole 712, at this time, the clamping rod 710 and the clamping hole 712 are released, the limiting between the first fixed shell 5 and the second fixed shell 6 is released through the release of the clamping rod 710 and the clamping hole 712, then the limiting rod 806 is rotated, so that the limiting rod 806 leaves the inner cavity of the through hole 805, the limiting of the limiting rod 806 to the fixed rod 802 is released through the leaving of the limiting rod 806 from the inner cavity of the through hole 805, the limiting between the first limiting half ring 9 and the second limiting half ring 10 is released through the release of the limiting of the fixed rod 802, the limiting between the first fixed shell 5 and the second fixed shell 6, the first limiting half ring 9 and the second limiting half ring 10 is released, and the pipeline connecting device is disassembled, thereby the pipeline connecting device is maintained, the convenience of the pipeline connecting device maintenance is increased, the maintenance efficiency is improved, and the maintenance cost is reduced.

[0033] The above only describes the embodiments of the utility model, and is not used for limiting the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the scope of claims of the utility model.

Claims

1. A pipe connection device for natural gas pipeline installation, comprising a first pipe body (1), characterized in that: One end of the first pipe body (1) is connected with the second pipe body (2), the surface of the connecting place of the first pipe body (1) and the second pipe body (2) is sleeved with the first sealing half ring (3) and the second sealing half ring (4), the surface of the first sealing half ring (3) and the second sealing half ring (4) is fixedly connected with the first fixed shell (5) and the second fixed shell (6) respectively, the connecting place of the first fixed shell (5) and the second fixed shell (6) is provided with two fixed assemblies (7), the fixed assembly (7) comprises a mounting bottom plate (701), one side of the mounting bottom plate (701) is fixedly connected with the surface of the first fixed shell (5), the other side of the mounting bottom plate (701) is fixedly provided with a mounting seat (702), one end of the two sides of the mounting seat (702) is fixedly provided with a mounting ring (703), a connecting rod (704) is fixedly arranged between the two mounting rings (703), the surface of the connecting rod (704) is movably sleeved with a movable cover plate (705), the surface of the movable cover plate (705) is provided with a groove (706), one side of the inner cavity of the mounting seat (702) is fixedly provided with a cylinder (707), one end of the cylinder (707) is movably connected with a movable plate (708), one side of the movable plate (708) is fixedly provided with a rotating block (709), one end of the movable cover plate (705) is fixedly provided with a clamping rod (710), the surface of the second fixed shell (6) is fixedly provided with a mounting plate (711), the surface of the mounting plate (711) is provided with a clamping hole (712) matched with the clamping rod (710), the two ends of the surface of the movable plate (708) are provided with a circular hole (713), the inner cavity of the circular hole (713) is screwedly connected with a fixing bolt (714), the surface of the movable cover plate (705) is provided with a threaded hole (715) matched with the fixing bolt (714), the two ends of the first sealing half ring (3) and the first fixed shell (5) are fixedly connected with a first limiting half ring (9), the two ends of the second sealing half ring (4) and the second fixed shell (6) are fixedly connected with a second limiting half ring (10), the connecting place of the first limiting half ring (9) and the second limiting half ring (10) is provided with an auxiliary fixing assembly (8).

2. A pipe coupling device for natural gas pipeline installation as claimed in claim 1, wherein: The auxiliary fixing assembly (8) comprises a mounting block (801), one side of the mounting block (801) is fixedly connected with the surface of the first limiting half ring (9), the surface of the mounting block (801) is fixedly provided with a fixing rod (802), and one end of the fixing rod (802) penetrates and extends to the outside of the mounting block (801), the surface of the second limiting half ring (10) is fixedly provided with a hollow block (803), the inner cavity of the hollow block (803) is fixedly provided with a limiting plate (804), the surface of the hollow block (803) and the limiting plate (804) is provided with a movable hole matched with the fixing rod (802), the surface of the fixing rod (802) is provided with a through hole (805), and the inner cavity of the hollow block (803) is movably connected with a limiting rod (806) matched with the through hole (805).

3. A pipe coupling device for natural gas pipeline installation as defined in claim 1, wherein: The number of the auxiliary fixing assembly (8) is four, and the four auxiliary fixing assemblies (8) are arranged in pairs at the connecting position of the first limiting half ring (9) and the second limiting half ring (10).

4. A pipe coupling device for natural gas pipeline installation as defined in claim 2, wherein: The number of the fixing rod (802) in the four auxiliary fixing assemblies (8) is two, and the two fixing rods (802) are centrally symmetrically arranged about the mounting block (801).

5. A pipe coupling device for natural gas pipeline installation as defined in claim 1, wherein: The number of the first limiting half ring (9) and the second limiting half ring (10) is two, and the two first limiting half rings (9) and the second limiting half rings (10) are sleeved on the surfaces of the first pipe body (1) and the second pipe body (2).

6. A pipe coupling device for natural gas pipeline installation as defined in claim 1, wherein: The number of the clamping rod (710) and the clamping hole (712) in the two fixing assemblies (7) is three, and the three clamping rods (710) and the clamping holes (712) are respectively arranged at equal distances on one end of the movable cover plate (705) and the surface of the mounting plate (711).

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