Natural gas pipeline maintenance and protection device

Abstract

The invention belongs to the technical field of natural gas pipelines, and particularly relates to a natural gas pipeline maintenance and protection device which comprises a main pipeline. The two protection boxes are connected to the outer side of the main pipeline in a sleeving manner; the protection mechanisms are arranged at two ends of the protection box; the protection mechanism comprises a sealing assembly and an insect prevention assembly. The leakage position of the main pipeline is detected through the detection device, then the sealing stickers are symmetrically pasted to the leakage position of the main pipeline, then the two protection boxes are clamped together through the first sealing ring, in the clamping process of the protection boxes, the connecting position of the main pipeline and the second sealing ring is stressed and extruded, and under the action of the second spring, the leakage position of the main pipeline is detected. The second sealing ring and the mounting seat are shrunk in the cavity, and the second sealing ring is tightly attached to the main pipeline, so that the sealing performance in the protection box is ensured, and water and impurities are prevented from entering; during installation, under the action of a third spring, the medicine storage box is tightly attached to the outer side of the main pipeline, insects and ants are prevented from entering the protection box and biting the sealing paste, and therefore the protection effect on the sealing paste is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas pipelines, in particular to a natural gas pipeline maintenance and protection device. Background Art

[0002] A natural gas pipeline refers to a pipeline that transports natural gas from the mining site or processing plant to the urban gas distribution center or industrial enterprise users. It is also called a gas transmission pipeline. Using a natural gas pipeline to transport natural gas is a way to transport large quantities of natural gas on land. Some pipelines will be exposed to the atmosphere. After a long period of erosion by wind, sun and rain, pipelines in some places will be corroded, resulting in natural gas leaks, which require maintenance.

[0003] A Chinese patent with publication number CN218294930U discloses a natural gas pipeline repair and plugging device, including a limit kit, a protective side plate and an airbag component, the limit kit includes two ring buckles, the two ring buckles are connected by a hinge block at the top, the protective side plates are provided in two groups, each group of protective side plates is provided with two, each group of protective side plates is provided on both sides of one of the ring buckles, the airbag components are provided with two, each airbag component is fixedly connected to the middle of the ring buckle; the protective side plate includes an arc-shaped baffle, the arc-shaped baffle is adapted to the shape of the ring buckle, wherein the inner side of the arc-shaped baffle is A rubber gasket is fixedly connected, and the arc-shaped baffle is connected to the annular buckle by multiple fastening bolts on one side. Through the setting of this structure, the airbag seal can be closer to the surface of the natural gas pipeline and avoid air leakage. The rubber gasket on the inner side of the arc-shaped baffle can fit tightly to the surface of the pipeline and limit the two sides of the airbag seal to avoid air leakage on both sides. Therefore, when using the device, you only need to put the device on the position of the pipeline leakage and then fix it to ventilate the trachea. It is easy to operate and can be operated by one person. At the same time, the device has a stable structure and can effectively ensure its service life.

[0004] In the current existing technology, rubber gaskets and air bags are used for sealing. However, the rubber gaskets and air bags may be corroded after being exposed to wind, sun, and insects and ants for a period of time. The leaking parts of the pipeline will leak again, requiring the natural gas pipeline to be repaired again, which is time-consuming, labor-intensive, and wastes repair materials.

[0005] To this end, the present invention provides a natural gas pipeline maintenance and protection device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a natural gas pipeline maintenance and protection device described in the present invention comprises: Main pipeline; Two protection boxes sleeved on the outside of the main pipeline; Protection mechanisms provided at both ends of the protection box; The protection mechanism includes a sealing component and an insect-proof component; cavities are opened at both ends of the protection box, and the sealing components are arranged in the cavities. The sealing component includes three second springs fixed to the inner wall of the cavity, the three second springs have different lengths, and the free ends are commonly fixed to a mounting seat, and a second sealing ring is fixed to the inner wall of the mounting seat, and the second sealing ring fits tightly with the main pipeline; the insect-proof components are provided in four groups, all of which are arranged on the inner wall of the protection box, and the insect-proof component includes an arc plate fixed to the inner wall of the protection box; three third springs are fixed to the inner wall of the arc plate close to the main pipeline, and the free ends of the third springs are commonly fixed to a medicine storage box, and the medicine storage box fits tightly with the main pipeline; insecticide is provided in the medicine storage box; the contact surfaces of the two protection boxes are clamped by the first sealing ring.

[0008] Preferably, a slide cylinder is fixedly connected to the inner wall of one of the protective boxes, a piston plate is slidably connected to the inner wall of the slide cylinder, and a first spring is fixedly connected between the piston plate and the protective box; a touch switch is fixedly connected to the inner wall of the protective box, and the touch switch cooperates with the movable plate; an indicator light and an alarm are fixedly installed on the outer wall of the protective box, and the indicator light and the alarm are electrically connected to the touch switch.

[0009] Preferably, two sealing stickers are attached to the outer side wall of the main pipe; the sealing stickers are made of rubber material.

[0010] Preferably, one end of the protective box is threadedly connected to a first screw rod, the top of the first screw rod passes through the protective box through a sleeve and is fixedly connected to a rotary block; the bottom of the first screw rod is rotatably connected to a first clamping plate, and the first clamping plate is fitted with one end of a sealing patch; the other end of the protective box is threadedly connected to a second screw rod, the bottom of the second screw rod is rotatably connected to a second clamping plate, and the second clamping plate is fitted with the other end of the sealing patch; a first rotating wheel is threadedly connected to the outer wall of the first screw rod; a second rotating wheel is threadedly connected to the outer wall of the second screw rod, the first rotating wheel and the second rotating wheel are rotatably connected to the inner wall of the protective box through bearings, and a belt is sleeved between the first rotating wheel and the second rotating wheel.

[0011] Preferably, a fixing plate is fixedly connected to the side walls of the protection box, and two adjacent fixing plates are connected by two fastening bolts.

[0012] Preferably, the outer sides of the two protective boxes are slidably connected with protective boxes through sliding grooves, and the protective boxes are arranged on the outer sides of the fastening bolts; sealing plates are fixedly connected to the two side walls of one of the protective boxes; and the protective boxes are fitted with the sealing plates through sealing rubber pads.

[0013] Preferably, two buckles are rotatably connected to the outer side wall of the blocking plate via a pin; and a clamping column is fixedly connected to the protection box, and the buckles cooperate with the clamping column.

[0014] Preferably, the top of the protection box is connected and fixedly connected with an exhaust pipe; an exhaust valve is installed on the exhaust pipe.

[0015] The beneficial effects of the present invention are as follows: 1. A natural gas pipeline maintenance and protection device described in the present invention, by setting a sealing component and an insect-proof component, when the main pipeline leaks, the position of the main pipeline leakage is detected by a detection device, and then the sealing sticker is symmetrically pasted on the leakage position of the main pipeline, and then the two protection boxes are clamped together by a first sealing ring, wherein during the clamping process of the protection box, the connection between the main pipeline and the second sealing ring is squeezed, and under the action of the second spring, the second sealing ring and the mounting seat shrink in the cavity, and the second sealing ring fits tightly with the main pipeline to ensure the sealing inside the protection box, prevent moisture and impurities from entering, and also prevent air leakage; during installation, under the action of the third spring, the medicine storage box is tightly fitted on the outside of the main pipeline, and the medicine storage box emits the smell of insecticide to prevent insects and ants from entering the protection box and gnawing the sealing sticker, thereby achieving the protection effect of the sealing sticker and extending the service life of the sealing sticker.

[0016] 2. The natural gas pipeline maintenance and protection device described in the present invention cooperates with a touch switch, an indicator light, an alarm and an exhaust pipe. After a period of time, the sealing sticker does not fit the main pipeline, and the natural gas will leak into the protection box. An air pressure difference is generated in the protection box and the slide cylinder. Under the action of the air pressure, the piston plate is pushed, and under the action of the first spring, the piston plate slides toward the touch switch. When the air pressure reaches a certain amount, the touch switch is turned on, and the indicator light and the alarm are turned on through the touch switch. The alarm is loud, reminding the maintenance personnel of the gas leakage; the indicator light becomes brighter, instructing the maintenance personnel to quickly lock the position, thereby realizing rapid maintenance and preventing the air pressure from being too high and the protection box from rupturing; before maintenance, the maintenance personnel need to discharge the natural gas in the protection box through the exhaust pipe, and then open the protection box, which not only prevents waste of resources, but also prevents the natural gas from harming the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 is a stereogram of the present invention; Figure 2 It is a schematic diagram of the structure of the first clamping plate and the second clamping plate in the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 It is a structural schematic diagram of the protection box in the present invention; Figure 5 It is a schematic diagram of the structure of the protection box in the present invention; Figure 6 It is a schematic diagram of the structure of the second spring and the third spring in the present invention; Figure 7 is a structural schematic diagram of a cross section of a second sealing ring in the present invention; Figure 8 It is a structural schematic diagram of a cross section of the medicine storage box in the present invention; Fig. 9 It is an enlarged view of A in the present invention; In the figure: 1. main pipeline; 2. protection box; 21. slide; 22. exhaust pipe; 23. indicator light; 24. alarm; 25. protection box; 251. blocking plate; 252. buckle; 253. clamping column; 26. fixing plate; 27. touch switch; 28. fastening bolt; 29. ​​first sealing ring; 210. first spring; 211. piston plate; 3. rotary block; 31. first screw rod; 32. first rotating wheel; 33. belt; 34. first splint; 35. sealing sticker; 36. second rotating wheel; 37. second screw rod; 38. second splint; 4. sealing assembly; 41. second sealing ring; 42. mounting seat; 43. second spring; 44. cavity; 5. insect-proof assembly; 51. arc plate; 52. third spring; 53. medicine storage box. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] like Figures 1 to 9 As shown, a natural gas pipeline maintenance and protection device according to an embodiment of the present invention comprises: a main pipeline 1; two protection boxes 2 sleeved on the outside of the main pipeline 1; protection mechanisms arranged at both ends of the protection boxes 2; the protection mechanisms comprise a sealing component 4 and an insect-proof component 5; cavities 44 are provided at both ends of the protection box 2, the sealing components 4 are arranged in the cavities 44, the sealing components 4 comprise three second springs 43 fixedly connected to the inner wall of the cavity 44, the three second springs 43 have different lengths, and the free ends are commonly fixedly connected to a mounting seat 42, the inner wall of the mounting seat 42 A second sealing ring 41 is fixedly connected on it, and the second sealing ring 41 fits tightly with the main pipeline 1; the insect-proof component 5 is provided with four groups, all of which are arranged on the inner wall of the protection box 2, and the insect-proof component 5 includes an arc-shaped plate 51 fixedly connected to the inner wall of the protection box 2; three third springs 52 are fixedly connected to the inner wall of the arc-shaped plate 51 close to the main pipeline 1, and the free ends of the third springs 52 are commonly fixedly connected to a medicine storage box 53, and the medicine storage box 53 fits tightly with the main pipeline 1; insecticide is arranged in the medicine storage box 53; the contact surfaces of the two protection boxes 2 are clamped by the first sealing ring 29.

[0021] The protective mechanism provided by the present invention is used to protect the sealing sticker 35 to slow down corrosion when in use. When the main pipeline 1 leaks, the leakage position of the main pipeline 1 is detected by the detection device, and then the sealing sticker 35 is symmetrically pasted on the leakage position of the main pipeline 1, and then the two protection boxes 2 are clamped together through the first sealing ring 29. During the clamping process of the protection box 2, the connection between the main pipeline 1 and the second sealing ring 41 is squeezed, and under the action of the second spring 43, the second sealing ring 41 and the mounting seat 42 shrink in the cavity 44, and the second sealing ring 41 fits tightly with the main pipeline 1 to ensure the sealing inside the protection box 2, prevent moisture and impurities from entering, and also prevent air leakage; during installation, under the action of the third spring 52, the medicine storage box 53 fits tightly on the outside of the main pipeline 1, and the medicine storage box 53 emits the smell of insecticide to prevent insects and ants from entering the protection box 2 and gnawing the sealing sticker 35, thereby achieving the protection effect of the sealing sticker 35 and extending the service life of the sealing sticker 35.

[0022] like Figure 3 and Fig. 9 As shown, a slide cylinder 21 is fixedly connected to the inner wall of one of the protective boxes 2, a piston plate 211 is slidably connected to the inner wall of the slide cylinder 21, and a first spring 210 is fixedly connected between the piston plate 211 and the protective box 2; a touch switch 27 is fixedly connected to the inner wall of the protective box 2, and the touch switch 27 cooperates with the movable plate; an indicator light 23 and an alarm 24 are fixedly installed on the outer wall of the protective box 2, and the indicator light 23 and the alarm 24 are electrically connected to the touch switch 27.

[0023] When the touch switch 27 provided by the present invention is in use, if the sealing sticker 35 does not fit the main pipeline 1 after a period of time, natural gas will leak into the protection box 2, and an air pressure difference will be generated in the protection box 2 and the slide cylinder 21. Under the action of the air pressure, the piston plate 211 is pushed, and under the action of the first spring 210, the piston plate 211 slides toward the touch switch 27. When the air pressure reaches a certain amount, the touch switch 27 is turned on, and the indicator light 23 and the alarm 24 are turned on through the touch switch 27. The alarm 24 is loud, reminding the maintenance personnel of the air leakage; the indicator light 23 becomes brighter, instructing the maintenance personnel to quickly lock the position, thereby realizing rapid maintenance and preventing the air pressure from being too high and the protection box 2 from rupturing.

[0024] like Figure 3 As shown, two sealing stickers 35 are attached to the outer wall of the main pipe 1; the sealing stickers 35 are made of rubber material.

[0025] The sealing sticker 35 provided by the present invention is used to stick to the main pipeline 1 when in use, so as to immediately block the main pipeline 1. The sealing sticker 35 is made of rubber material, has good elasticity and compressibility, and can be attached to the outer wall of the main pipeline 1.

[0026] like Figure 2 and Figure 3 As shown, one end of the protection box 2 is threadedly connected with a first screw rod 31, the top of the first screw rod 31 passes through the protection box 2 through a shaft sleeve, and is fixedly connected with a rotary block 3; the bottom of the first screw rod 31 is rotatably connected with a first clamping plate 34, and the first clamping plate 34 is fitted with one end of a sealing sticker 35; the other end of the protection box 2 is threadedly connected with a second screw rod 37, the bottom of the second screw rod 37 is rotatably connected with a second clamping plate 38, and the second clamping plate 38 is fitted with the other end of the sealing sticker 35; the outer wall of the first screw rod 31 is threadedly connected with a first rotating wheel 32; the outer wall of the second screw rod 37 is threadedly connected with a second rotating wheel 36, the first rotating wheel 32 and the second rotating wheel 36 are both rotatably connected to the inner wall of the protection box 2 through bearings, and a belt 33 is sleeved between the first rotating wheel 32 and the second rotating wheel 36.

[0027] The first clamping plate 34 and the second clamping plate 38 provided by the present invention are used to fix the sealing sticker 35 when in use. By rotating the rotary block 3, the first screw rod 31 is driven to rotate by the rotary block 3, the first screw rod 31 drives the first rotating wheel 32 to rotate, the first rotating wheel 32 drives the belt 33 to rotate, the second rotating wheel 36 is driven to rotate by the belt 33, the second rotating wheel 36 drives the second screw rod 37 to rotate, the first screw rod 31 and the second screw rod 37 are rotated, the first screw rod 31 and the second screw rod 37 are rotated, the first screw rod 31 and the second screw rod 37 are moved downward, and the first clamping plate 34 and the second clamping plate 38 are driven downward by the first screw rod 31 and the second screw rod 37 until the sealing sticker 35 is tightly fixed to the outside of the main pipe 1.

[0028] like Figure 5 As shown, the side walls of the protection box 2 are fixedly connected with fixing plates 26 , and two adjacent fixing plates 26 are connected by two fastening bolts 28 .

[0029] The fastening bolts 28 provided by the present invention are used to install the fixing plate 26 when in use. The two protection boxes 2 are tightly fitted together through the first sealing ring 29, and the two fixing plates 26 are fixed together by the fastening bolts 28, so that the two protection boxes 2 are connected together.

[0030] like Figure 1 and Figure 4 As shown, the outer sides of the two protection boxes 2 are slidably connected with protection boxes 25 through sliding grooves, and the protection boxes 25 are arranged on the outer sides of the fastening bolts 28; sealing plates 251 are fixedly connected to the two side walls of one of the protection boxes 2; the protection boxes 25 are fitted with the sealing plates 251 through sealing pads.

[0031] When the protective box 25 provided by the present invention is in use, after the two protective boxes 2 are connected together, the protective box 25 is slid through the slide groove to fit tightly with the sealing plate 251, so as to protect the fastening bolts 28 in the protective box 25 to prevent the fastening bolts 28 from being corroded by the weather and inconvenient to disassemble.

[0032] like Figure 4 As shown, two buckles 252 are rotatably connected to the outer wall of the blocking plate 251 through a pin shaft; a clamping column 253 is fixedly connected to the protection box 25, and the buckles 252 cooperate with the clamping column 253.

[0033] When the buckle 252 and the clamping column 253 provided by the present invention are in use, the protection box 25 slides and fits tightly with the blocking plate 251. The buckle 252 and the clamping column 253 cooperate to connect the protection box 25 and the blocking plate 251 together to prevent the protection box 25 from sliding under the action of external force.

[0034] like Figure 3 As shown, the top of the protection box 2 is connected and fixedly connected with an exhaust pipe 22; an exhaust valve is installed on the exhaust pipe 22.

[0035] When the exhaust pipe 22 provided by the present invention is in use, after the alarm 24 sounds, the maintenance personnel need to discharge the natural gas in the protection box 2 through the exhaust pipe 22 before maintenance, and then open the protection box 2, which can prevent waste of resources and prevent natural gas from harming the maintenance personnel.

[0036] Working principle: when the main pipeline 1 leaks, the position of the leakage of the main pipeline 1 is detected by the detection device, and then the sealing sticker 35 is symmetrically pasted on the leakage position of the main pipeline 1, and then the two protection boxes 2 are clamped together through the first sealing ring 29, and the rotary block 3 is rotated to drive the first screw rod 31 to rotate through the rotary block 3, and the first screw rod 31 drives the first rotating wheel 32 to rotate, and the first rotating wheel 32 drives the belt 33 to rotate, and the second rotating wheel 36 drives the second screw rod 37 to rotate through the belt 33, and the first screw rod 31 and the second screw rod 37 rotate, and the first screw rod 31 and the second screw rod 37 rotate, and the first screw rod 31 and the second screw rod 37 move downward, and the first screw rod 31 and the second screw rod 37 drive the first clamping plate 34 and the second clamping plate 34 to rotate. 38 moves downward until the sealing sticker 35 is tightly fixed on the outside of the main pipe 1; during the clamping process of the protection box 2, the connection between the main pipe 1 and the second sealing ring 41 is squeezed, and under the action of the second spring 43, the second sealing ring 41 and the mounting seat 42 shrink in the cavity 44, and the second sealing ring 41 fits tightly with the main pipe 1 to ensure the sealing inside the protection box 2, prevent moisture and impurities from entering, and also prevent air leakage; during installation, under the action of the third spring 52, the medicine storage box 53 fits tightly on the outside of the main pipe 1, and the medicine storage box 53 emits the smell of insecticide to prevent insects and ants from entering the protection box 2 and gnawing the sealing sticker 35, thereby achieving the protection effect of the sealing sticker 35 and extending the service life of the sealing sticker 35; The two protection boxes 2 are tightly fitted together through the first sealing ring 29, and the two fixing plates 26 are fixedly installed together through the fastening bolts 28, so that the two protection boxes 2 are connected together. After the two protection boxes 2 are connected together, the protection box 25 is slid through the slide groove to tightly fit with the blocking plate 251, so that the fastening bolts 28 are protected in the protection box 25, and the protection box 25 is connected to the blocking plate 251 through the buckle 252 and the clamping column 253, so as to prevent the fastening bolts 28 from being corroded by the weather and inconvenient to disassemble; If after a period of time, the sealing sticker 35 does not fit the main pipeline 1, the natural gas will leak into the protection box 2, and an air pressure difference will be generated in the protection box 2 and the slide cylinder 21. Under the action of the air pressure, the piston plate 211 is pushed, and under the action of the first spring 210, the piston plate 211 slides toward the touch switch 27. When the air pressure reaches a certain amount, the touch switch 27 is turned on. Through the touch switch 27, the indicator light 23 and the alarm 24 are turned on. The alarm 24 is loud, reminding the maintenance personnel of the gas leakage; the indicator light 23 lights up, instructing the maintenance personnel to quickly lock the position, thereby realizing rapid maintenance and preventing the air pressure from being too high and the protection box 2 from rupturing; before maintenance, the maintenance personnel need to discharge the natural gas in the protection box 2 through the exhaust pipe 22, and then open the protection box 2, which not only prevents waste of resources, but also prevents the natural gas from harming the maintenance personnel.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A natural gas pipeline maintenance and protection device, comprising: Main pipeline (1); Two protection boxes (2) sleeved on the outside of the main pipeline (1); Protection mechanisms provided at both ends of the protection box (2); The invention is characterized in that: the protection mechanism comprises a sealing component (4) and an insect-proof component (5); both ends of the protection box (2) are provided with cavities (44), the sealing components (4) are arranged in the cavities (44), the sealing components (4) comprise three second springs (43) fixedly connected to the inner wall of the cavity (44), the three second springs (43) have different lengths, and the free ends of the three second springs (43) are commonly fixedly connected to a mounting seat (42), a second sealing ring (41) is fixedly connected to the inner wall of the mounting seat (42), and the second sealing ring (41) is tightly fitted with the main pipeline (1). The insect-proof components (5) are provided in four groups, all of which are arranged on the inner wall of the protection box (2). The insect-proof components (5) include an arc-shaped plate (51) fixedly connected to the inner wall of the protection box (2); three third springs (52) are fixedly connected to the inner wall of the arc-shaped plate (51) close to the main pipeline (1); the free ends of the third springs (52) are commonly fixedly connected to a medicine storage box (53), and the medicine storage box (53) is tightly fitted with the main pipeline (1); the medicine storage box (53) is provided with insecticide; the contact surfaces of the two protection boxes (2) are clamped by a first sealing ring (29).

2. A natural gas pipeline maintenance and protection device according to claim 1, characterized in that: A slide cylinder (21) is fixedly connected to the inner wall of one of the protection boxes (2), a piston plate (211) is slidably connected to the inner wall of the slide cylinder (21), and a first spring (210) is fixedly connected between the piston plate (211) and the protection box (2); a touch switch (27) is fixedly connected to the inner wall of the protection box (2), and the touch switch (27) cooperates with the movable plate; an indicator light (23) and an alarm (24) are fixedly installed on the outer wall of the protection box (2), and the indicator light (23) and the alarm (24) are both electrically connected to the touch switch (27).

3. A natural gas pipeline maintenance and protection device according to claim 2, characterized in that: Two sealing stickers (35) are adhered to the outer wall of the main pipe (1); the sealing stickers (35) are made of rubber material.

4. A natural gas pipeline maintenance and protection device according to claim 3, characterized in that: One end of the protection box (2) is threadedly connected to a first screw rod (31), the top of the first screw rod (31) passes through the protection box (2) through a shaft sleeve and is fixedly connected to a rotary block (3); the bottom of the first screw rod (31) is rotatably connected to a first clamping plate (34), and the first clamping plate (34) is in contact with one end of a sealing sticker (35); the other end of the protection box (2) is threadedly connected to a second screw rod (37), the bottom of the second screw rod (37) is rotatably connected to a second clamping plate (38), and the second clamping plate (38) is in contact with the other end of the sealing sticker (35); a first rotating wheel (32) is threadedly connected to the outer wall of the first screw rod (31); a second rotating wheel (36) is threadedly connected to the outer wall of the second screw rod (37), the first rotating wheel (32) and the second rotating wheel (36) are both rotatably connected to the inner wall of the protection box (2) through bearings, and a belt (33) is sleeved between the first rotating wheel (32) and the second rotating wheel (36).

5. A natural gas pipeline maintenance and protection device according to claim 4, characterized in that: A fixing plate (26) is fixedly connected to the side walls of the protection box (2), and two adjacent fixing plates (26) are connected via two fastening bolts (28).

6. A natural gas pipeline maintenance and protection device according to claim 5, characterized in that: The outer sides of the two protection boxes (2) are slidably connected to protection boxes (25) via sliding grooves, and the protection boxes (25) are arranged on the outer sides of the fastening bolts (28); sealing plates (251) are fixedly connected to the two side walls of one of the protection boxes (2); and the protection boxes (25) are fitted to the sealing plates (251) via sealing pads.

7. A natural gas pipeline maintenance and protection device according to claim 6, characterized in that: Two buckles (252) are rotatably connected to the outer side wall of the blocking plate (251) via a pin shaft; a clamping column (253) is fixedly connected to the protection box (25), and the buckles (252) cooperate with the clamping column (253).

8. A natural gas pipeline maintenance and protection device according to claim 7, characterized in that: The top of the protection box (2) is connected and fixedly connected with an exhaust pipe (22); an exhaust valve is installed on the exhaust pipe (22).

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