A connecting structure for a flange opening of a fiberglass reinforced plastic pipe and its connection method

Abstract

The present invention relates to a connection structure and a connection method for a flange opening of a fiberglass reinforced plastic pipe, and the present invention relates to the technical field of flanges. The present invention includes a pipe body, one side of the pipe body is fixedly connected with a first flange, a first protective box and a second protective box are arranged on the circumferential side of the pipe body, and the first protective box and the second protective box are fixed to the pipe body through half pipes. An annular groove is formed on one side of the first flange, a circular ring is slidably connected in the annular groove, a second flange is fixedly connected to one side of the circular ring, and a plurality of connecting mechanisms are arranged on the circular ring to fix the second flange and the first flange. An oil filling pipe is fixedly connected to the inner side of the circumference of the annular groove, and the oil filling pipe penetrates through the circumferential side of the first flange. The annular groove, the lubricating oil pipe, the piston, the insertion pipe, the air pipe, the oil filling pipe, the circular ring, the first flange and the second flange cooperate to prevent the reduction of lubricating oil from affecting the airtightness between the second flange and the first flange.

Description

Technical Field

[0001] The present invention relates to the technical field of flanges, and in particular to a connecting structure and a connecting method for a flange opening of a fiberglass pipe. Background Art

[0002] A flange, also known as a flange convex disc or a flange. A flange is a part for connecting shafts to each other and is used for connecting between pipe ends; there are also flanges used at the inlets and outlets of equipment for connecting between two pieces of equipment, such as a reducer flange. A flange connection or a flange joint refers to a detachable connection formed by connecting a flange, a gasket, and bolts together as a set of combined sealing structures.

[0003] When a flange is installed outdoors, some flanges are sealed with lubricating oil to reduce the degree of corrosion. The flange is exposed to the air for a long time and is affected by wind, rain, and high-temperature weather. The lubricating oil in the flange sealed with lubricating oil is vaporized by high temperature, resulting in the loss of lubricating oil, weakening the airtightness and corrosion resistance, and reducing the service life of the flange. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a connecting structure and a connecting method for a flange opening of a fiberglass pipe, which have the effect of preventing the vaporization and consumption of lubricating oil and affecting the airtightness, corrosion resistance, and service life of the flange.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions:

[0006] A connecting structure and a connecting method for a flange opening of a fiberglass pipe, including a pipe body. One side of the pipe body is fixedly connected with a first flange. The circumferential side of the pipe body is provided with a first protective box and a second protective box. The first protective box and the second protective box are fixed to the pipe body through a half pipe. One side of the first flange is provided with an annular groove. A ring is slidably connected in the annular groove. One side of the ring is fixedly connected with a second flange. A plurality of connecting mechanisms are arranged on the ring to fix the second flange and the first flange. The circumferential inner side of the annular groove is fixedly connected with an oil filling pipe, and the oil filling pipe penetrates through the circumferential side of the first flange. An insertion pipe is arranged in the oil filling pipe, and the insertion pipe movably penetrates through the upper end of the first protective box and is fixedly connected with a lubricating oil pipe. A piston is slidably connected to the circumferential inner side of the lubricating oil pipe. One side of the lubricating oil pipe is fixedly connected with an air pipe, and the air pipe penetrates through the inner top wall of the first protective box. Exhaust pipes and air extraction pipes are fixedly connected to both sides of the second protective box.

[0007] By adopting the above technical solutions, the annular groove, the lubricating oil pipe, the piston, the insertion pipe, the air pipe, the oil filling pipe, the ring, the first flange, and the second flange cooperate to prevent the reduction of lubricating oil from affecting the airtightness between the second flange and the first flange.

[0008] In a preferred example, the present invention can be further configured as follows: each of the connecting mechanisms includes a plug rod, a circular block, a circular groove, two plugging blocks, and two inserting blocks. The circular groove is formed on one side wall of the annular groove. The plug rod is rotatably arranged on one side of the ring. The circular block is fixedly connected to one side of the plug rod. The two plugging blocks are both fixedly connected to one side wall of the circular groove. The two inserting blocks are both fixedly connected to the circumferential side of the circular block. The two inserting blocks are respectively inserted into the two plugging blocks.

[0009] By adopting the above technical solution, the connecting mechanism can fix the first flange and the second flange.

[0010] In a preferred example, the present invention can be further configured as follows: a driving groove is formed on the circumferential side of the ring. A rotating mechanism is arranged between the driving groove and the plurality of circular blocks. The plurality of plug rods all movably penetrate through one side wall of the driving groove. The rotating mechanism includes a gear ring and a plurality of gears. The plurality of gears are respectively fixedly connected to one side of the plurality of plug rods. The gear ring is rotatably connected to one side wall of the driving groove. The gear ring meshes with the plurality of gears.

[0011] By adopting the above technical solution, the rotating mechanism can rotate the plug rod.

[0012] In a preferred example, the present invention can be further configured as follows: the rotating mechanism further includes a plurality of first threaded grooves and a plurality of second threaded grooves. The plurality of first threaded grooves are respectively formed on the inner circumferential side of the plurality of circular grooves. The plurality of second threaded grooves are respectively formed on the circumferential side of the plurality of plug rods.

[0013] By adopting the above technical solution, a part of the first threaded groove is formed at the notch of the circular groove, and the second threaded groove is formed on the side of the plug rod deviating from the gear, which can realize the tightness between the circular block and the circular groove, and at the same time does not delay the rotation of the circular block.

[0014] In a preferred example, the present invention can be further configured as follows: a first connecting block and a second connecting block are fixedly connected to one side of the first protective box and the second protective box respectively. A fixing mechanism is arranged between the first connecting block and the second connecting block. The fixing mechanism includes two installation grooves, a clamping groove, two clamping blocks, and two springs. The two installation grooves are both formed at the lower end of the second connecting block. The clamping groove is formed at the upper end of the first connecting block. The two springs are respectively fixedly connected to the adjacent side walls of the two installation grooves. The two clamping blocks are respectively fixedly connected to the other side of the two springs. And the two clamping blocks both movably penetrate through the clamping groove.

[0015] By adopting the above technical solution, the fixing mechanism can fix the first protective box and the second protective box.

[0016] In a preferred embodiment, the present invention can be further configured as follows: Two limiting rods are fixedly connected between the side walls of the two mounting grooves, and the two clamping blocks are respectively slidably connected to the circumferential sides of the four limiting rods.

[0017] By adopting the above technical solution, the sliding fit between the clamping block and the limiting rod can improve the movement stability of the clamping block.

[0018] In a preferred embodiment, the present invention can be further configured as follows: A sealing strip is fixedly connected to the lower end of the first protective box, and check valves are installed in both the discharge pipe and the suction pipe.

[0019] By adopting the above technical solution, the check valve can prevent gas from flowing out in the reverse direction.

[0020] In a preferred embodiment, the present invention can be further configured as follows: Two third connecting blocks are fixedly connected to the circumferential sides of the two half pipes respectively. Two screws are arranged below the two third connecting blocks on the lower side, and the four screws are respectively threadedly connected to the two third connecting blocks on the upper side.

[0021] By adopting the above technical solution, the third connecting block and the screw can facilitate the fixation of the half pipe.

[0022] In a preferred embodiment, the present invention can be further configured as follows: Protective shells are fixedly connected to one side of the second connecting block and the two third connecting blocks on the upper side.

[0023] By adopting the above technical solution, the protective shell can reduce the damage of screws, clamping blocks, springs, etc. caused by wind, rain, etc.

[0024] A method for using a connecting structure of a fiberglass pipe flange opening includes the following steps:

[0025] S1: Insert the ring into the annular groove, insert the insertion rod into the circular groove, rotate the gear ring, the gear ring drives a plurality of gears to rotate, the gears drive the insertion rod and the circular block to rotate, the insertion block rotates along with the circular groove, and the insertion block is inserted into the insertion block. At this time, the circular block and the second flange are fixed, so that the ring and the second flange are fixed, and thus the first flange and the second flange are fixed;

[0026] S2: Clamp the first protective box and the second protective box on the pipe body, clamp the two half pipes on the circumferential side of the pipe body, and rotate the screws to fix the adjacent third connecting blocks, so as to facilitate the fixation of the first protective box and the second protective box to the pipe body;

[0027] S3: After the first protective box and the second protective box are fixed in step S2, the clamping block is inserted into the card slot, and the two springs are in a compressed state. The springs push the clamping block to make the clamping block fit more closely with the card slot;

[0028] S4: Insert the cannula into the fuel filling pipe, evacuate the air in the first protective box and the second protective box through the second connecting block. When the lubricating oil in the annular groove and the circular ring is vaporized by high temperature, the gas in the first protective box and the second protective box increases. The gas enters the lubricating oil pipe from the trachea, and the gas pushes the piston to move. The piston moves to push the lubricating oil contained in the lubricating oil pipe into the fuel filling pipe through the cannula. The fuel filling pipe fills the space between the annular groove and the circular ring to prevent the reduction of lubricating oil from affecting the airtightness between the second flange and the first flange.

[0029] In summary, the present invention includes at least one of the following beneficial technical effects:

[0030] 1. There are provided a circular ring, an annular groove, a fuel filling pipe, a lubricating oil pipe, a piston and a trachea. The lubricating oil pipe is divided into two cavities by the piston. The cavity on one side of the cannula is filled with lubricating oil. Insert the cannula into the fuel filling pipe, evacuate the air in the first protective box and the second protective box through the second connecting block. When the lubricating oil in the annular groove and the circular ring is vaporized by high temperature, the gas in the first protective box and the second protective box increases. The gas enters the lubricating oil pipe from the trachea, and the gas pushes the piston to move. The piston moves to push the lubricating oil contained in the lubricating oil pipe into the fuel filling pipe through the cannula. The fuel filling pipe fills the space between the annular groove and the circular ring to prevent the reduction of lubricating oil from affecting the airtightness and corrosion resistance between the second flange and the first flange, and improve the service life of the flange.

[0031] 2. There are provided a first connecting block, a third connecting block, a screw, a second connecting block and a fixing mechanism. The two half pipes are clamped on the circumferential side of the pipe body. Rotate the screw to fix the adjacent third connecting blocks, so as to facilitate the fixation of the first protective box and the second protective box to the pipe body. The block is inserted into the slot, and the two springs are in a compressed state. The springs push the block to make the block fit more closely with the slot, and the fixation of the first protective box and the second protective box can be realized.

[0032] 3. There are provided a connecting mechanism and a rotating mechanism. Insert the circular ring into the annular groove, insert the plug rod into the circular groove, rotate the gear ring, the gear ring drives a plurality of gears to rotate, the gears drive the plug rod and the circular block to rotate, the plug block rotates along with the circular groove, and the plug block is inserted into the plug-in block. At this time, the circular block is fixed to the second flange, so that the circular ring is fixed to the second flange, and thus the first flange and the second flange are fixed. Description of the Drawings

[0033] Figure 1 is the perspective view of this embodiment;

[0034] Figure 2 is the first three-dimensional sectional view of this embodiment;

[0035] Figure 3 is the second three-dimensional sectional view of this embodiment;

[0036] Figure 4 is the partial enlarged view of location A in this embodiment Figure 3 ;

[0037] Figure 5 is the third three-dimensional sectional view of this embodiment

[0038] Figure 6 is the partial enlarged view of location B in this embodiment Figure 5 ;

[0039] Figure 7 is the fourth three-dimensional sectional view of this embodiment

[0040] Figure 8 is the partial enlarged view of location C in this embodiment Figure 7 ;

[0041] Figure 9 is the fifth three-dimensional sectional view of this embodiment

[0042] In the figure, 1, pipeline main body; 2, first protective box; 3, second protective box; 4, half pipe; 5, sealing strip; 6, screw; 7, lubricating oil pipe; 8, inserting pipe; 9, air pipe; 10, exhaust pipe; 11, check valve; 12, protective shell; 13, first connecting block; 14, fixing mechanism; 1401, installation groove; 1402, clamping groove; 1403, clamping block; 1404, spring; 1405, limiting rod; 15, piston; 16, first flange; 17, second flange; 18, annular groove; 19, ring; 20, rotating mechanism; 2001, gear ring; 2002, gear; 2003, first thread groove; 2004, second thread groove; 21, connecting mechanism; 2101, inserting rod; 2102, circular block; 2103, circular groove; 2104, inserting block; 2105, inserting block; 22, driving groove; 23, fuel filling pipe; 24, air extraction pipe; 25, second connecting block; 26, third connecting block Embodiment

[0043] The following further elaborates on the present invention in conjunction with the accompanying drawings Example

[0044] Refer to Figures 1-9, a connecting structure and a connecting method for a flange opening of a fiberglass reinforced plastic pipe disclosed by the present invention, comprising a pipe main body 1, a first flange 16 fixedly connected to one side of the pipe main body 1, a first protective box 2 and a second protective box 3 arranged on the circumferential side of the pipe main body 1, the first protective box 2 and the second protective box 3 are fixed to the pipe main body 1 through a half pipe 4, an annular groove 18 is formed on one side of the first flange 16, a circular ring 19 is slidably connected in the annular groove 18, a second flange 17 is fixedly connected to one side of the circular ring 19, and a plurality of connecting mechanisms 21 are arranged on the circular ring 19 to realize the fixation of the second flange 17 and the first flange 16. A fueling pipe 23 is fixedly connected to the inner circumferential side of the annular groove 18, and the fueling pipe 23 penetrates through the circumferential side of the first flange 16. An insertion pipe 8 is arranged in the fueling pipe 23, and the insertion pipe 8 movably penetrates through the upper end of the first protective box 2 and is fixedly connected to a lubricating oil pipe 7. A piston 15 is slidably connected to the inner circumferential side of the lubricating oil pipe 7. An air pipe 9 is fixedly connected to one side of the lubricating oil pipe 7, and the air pipe 9 penetrates through the inner top wall of the first protective box 2. Exhaust pipes 10 and air extraction pipes 24 are fixedly connected to both sides of the second protective box 3. The lubricating oil pipe 7 is divided into two cavities by the piston 15. The cavity on one side of the insertion pipe 8 is filled with lubricating oil. The insertion pipe 8 is inserted into the fueling pipe 23, and the air in the first protective box 2 and the second protective box 3 is evacuated through a second connecting block 25. When the lubricating oil in the annular groove 18 and the circular ring 19 is vaporized due to high temperature, the gas in the first protective box 2 and the second protective box 3 increases, and the gas enters the lubricating oil pipe 7 from the air pipe 9. The gas pushes the piston 15 to move, and the piston 15 moves to push the lubricating oil contained in the lubricating oil pipe 7 into the fueling pipe 23 through the insertion pipe 8. The fueling pipe 23 fuels the space between the annular groove 18 and the circular ring 19 to prevent the reduction of lubricating oil from affecting the airtightness between the second flange 17 and the first flange 16.

[0045] Each set of connecting mechanisms 21 includes a plug rod 2101, a circular block 2102, a circular groove 2103, two plugging blocks 2104 and two inserting blocks 2105. The circular groove 2103 is formed on one side wall of the annular groove 18. The plug rod 2101 is rotatably arranged on one side of the ring 19. The circular block 2102 is fixedly connected to one side of the plug rod 2101. The two plugging blocks 2104 are fixedly connected to one side wall of the circular groove 2103 respectively. The two inserting blocks 2105 are fixedly connected to the circumferential side of the circular block 2102 respectively. The two inserting blocks 2105 are respectively inserted into the two plugging blocks 2104. The connecting mechanism 21 can fix the first flange 16 and the second flange 17. A driving groove 22 is formed on the circumferential side of the ring 19. A rotating mechanism 20 is arranged between the driving groove 22 and the multiple circular blocks 2102. The multiple plug rods 2101 all movably penetrate through one side wall of the driving groove 22. The rotating mechanism 20 includes a gear ring 2001 and multiple gears 2002. The multiple gears 2002 are fixedly connected to one side of the multiple plug rods 2101 respectively. The gear ring 2001 is rotatably connected to one side wall of the driving groove 22. The gear ring 2001 meshes with the multiple gears 2002. The rotating mechanism 20 further includes multiple first threaded grooves 2003 and multiple second threaded grooves 2004. The multiple first threaded grooves 2003 are respectively formed on the inner circumferential sides of the multiple circular grooves 2103. The multiple second threaded grooves 2004 are respectively formed on the circumferential sides of the multiple plug rods 2101. The first threaded groove 2003 is formed on a part of the notch of the circular groove 2103. The second threaded groove 2004 is formed on the side of the plug rod 2101 deviating from the gear 2002. It can realize the tightness between the circular block 2102 and the circular groove 2103, and at the same time does not delay the rotation of the circular block 2102. Insert the ring 19 into the annular groove 18, insert the plug rod 2101 into the circular groove 2103, rotate the gear ring 2001, the gear ring 2001 drives the multiple gears 2002 to rotate, the gears 2002 drive the plug rod 2101 and the circular block 2102 to rotate, the inserting block 2105 rotates along with the circular groove 2103, and the inserting block 2105 is inserted into the plugging block 2104. At this time, the circular block 2102 and the second flange 17 are fixed, so that the ring 19 and the second flange 17 are fixed, and thus the first flange 16 and the second flange 17 are fixed.

[0046] On one side of the first protective box 2 and the second protective box 3, a first connecting block 13 and a second connecting block 25 are fixedly connected. A fixing mechanism 14 is arranged between the first connecting block 13 and the second connecting block 25. The fixing mechanism 14 includes two mounting grooves 1401, a clamping groove 1402, two clamping blocks 1403 and two springs 1404. The two mounting grooves 1401 are both opened at the lower end of the second connecting block 25. The clamping groove 1402 is opened at the upper end of the first connecting block 13. The two springs 1404 are respectively fixedly connected to the adjacent side walls of the two mounting grooves 1401. The two clamping blocks 1403 are respectively fixedly connected to the other sides of the two springs 1404, and the two clamping blocks 1403 both movably penetrate through the clamping groove 1402. Two limiting rods 1405 are fixedly connected between the side walls of the two mounting grooves 1401. The two clamping blocks 1403 are respectively slidably connected to the circumferential sides of the four limiting rods 1405. The sliding fit between the clamping block 1403 and the limiting rod 1405 can improve the moving stability of the clamping block 1403. The two half pipes 4 are clamped on the circumferential side of the pipeline main body 1. The screw 6 is rotated to fix the adjacent third connecting blocks 26, so as to facilitate the fixation of the first protective box 2 and the second protective box 3 to the pipeline main body 1. The clamping block 1403 is inserted into the clamping groove 1402, and the two springs 1404 are in a compressed state. The spring 1404 pushes the clamping block 1403, so that the clamping block 1403 and the clamping groove 1402 fit more tightly, and the fixation of the first protective box 2 and the second protective box 3 can be realized.

[0047] A sealing strip 5 is fixedly connected to the lower end of the first protective box 2. Check valves 11 are installed in both the exhaust pipe 10 and the suction pipe 24. The check valve 11 can prevent the gas from flowing out in the reverse direction.

[0048] Two third connecting blocks 26 are fixedly connected to the circumferential sides of the two half pipes 4. Two screws 6 are arranged below the two third connecting blocks 26 on the lower side, and the four screws 6 are respectively threadedly connected to the two third connecting blocks 26 on the upper side. The third connecting block 26 and the screw 6 can facilitate the fixation of the half pipe 4. A protective shell 12 is fixedly connected to one side of the second connecting block 25 and the two third connecting blocks 26 on the upper side. The protective shell 12 can reduce the damage of the screw 6, the clamping block 1403, the spring 1404, etc. caused by wind and rain.

[0049] A using method of a connection structure for a glass fiber reinforced plastic pipeline flange opening includes the following steps:

[0050] S1: Insert the circular ring 19 into the annular groove 18, insert the insertion rod 2101 into the circular groove 2103, rotate the gear ring 2001, the gear ring 2001 drives a plurality of gears 2002 to rotate, the gears 2002 drive the insertion rod 2101 and the circular block 2102 to rotate, the insertion block 2105 rotates along with the circular groove 2103, and the insertion block 2105 is inserted into the insertion connection block 2104. At this time, the circular block 2102 and the second flange 17 are fixed, so that the circular ring 19 and the second flange 17 are fixed, and thus the first flange 16 and the second flange 17 are fixed;

[0051] S2: Clamp the first protective box 2 and the second protective box 3 on the pipeline main body 1, clamp the two half pipes 4 on the circumferential side of the pipeline main body 1, and rotate the screw 6 to fix the adjacent third connection blocks 26, so as to facilitate the fixation of the first protective box 2 and the second protective box 3 to the pipeline main body 1;

[0052] S3: After the first protective box 2 and the second protective box 3 are fixed in step S2, the clamping block 1403 is inserted into the clamping groove 1402, and the two springs 1404 are in a compressed state. The springs 1404 push the clamping block 1403 to make the clamping block 1403 fit more closely with the clamping groove 1402;

[0053] S4: Insert the insertion pipe 8 into the fuel pipe 23, evacuate the air in the first protective box 2 and the second protective box 3 through the second connection block 25. When the lubricating oil in the annular groove 18 and the circular ring 19 is vaporized by high temperature, the gas in the first protective box 2 and the second protective box 3 increases. The gas enters the lubricating oil pipe 7 from the air pipe 9, and the gas pushes the piston 15 to move. The piston 15 moves to push the lubricating oil contained in the lubricating oil pipe 7 into the fuel pipe 23 through the insertion pipe 8. The fuel pipe 23 refuels between the annular groove 18 and the circular ring 19 to prevent the reduction of the lubricating oil from affecting the airtightness between the second flange 17 and the first flange 16.

[0054] The implementation principle of the above embodiments is as follows: Insert the circular ring 19 into the annular groove 18, insert the insertion rod 2101 into the circular groove 2103, rotate the gear ring 2001, the gear ring 2001 drives a plurality of gears 2002 to rotate, the gears 2002 drive the insertion rod 2101 and the circular block 2102 to rotate, the insertion block 2105 rotates along with the circular groove 2103, and the insertion block 2105 is inserted into the insertion connection block 2104. At this time, the circular block 2102 and the second flange 17 are fixed, so that the circular ring 19 and the second flange 17 are fixed, and thus the first flange 16 and the second flange 17 are fixed. Clamp the first protective box 2 and the second protective box 3 on the pipeline main body 1, clamp the two half pipes 4 on the circumferential side of the pipeline main body 1, rotate the screw 6 to fix the adjacent third connection blocks 26, so as to facilitate the fixation of the first protective box 2 and the second protective box 3 to the pipeline main body 1. The clamping block 1403 is inserted into the clamping groove 1402, and the two springs 1404 are in a compressed state. The springs 1404 push the clamping block 1403 to make the clamping block 1403 fit more closely with the clamping groove 1402. Insert the insertion pipe 8 into the fuel injection pipe 23, evacuate the air in the first protective box 2 and the second protective box 3 through the second connection block 25. When the lubricating oil in the annular groove 18 and the circular ring 19 is vaporized by high temperature, the gas in the first protective box 2 and the second protective box 3 increases, and the gas enters the lubricating oil pipe 7 from the air pipe 9. The gas pushes the piston 15 to move, and the piston 15 moves to push the lubricating oil contained in the lubricating oil pipe 7 into the fuel injection pipe 23 through the insertion pipe 8. The fuel injection pipe 23 refuels the space between the annular groove 18 and the circular ring 19 to prevent the reduction of lubricating oil from affecting the airtightness between the second flange 17 and the first flange 16.

[0055] The content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0056] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A connecting structure for the flange opening of a fiberglass reinforced plastic pipe, comprising a pipe body (1), characterized in that: One side of the pipeline main body (1) is fixedly connected with a first flange (16). A first protective box (2) and a second protective box (3) are arranged on the circumferential side of the pipeline main body (1). An annular groove (18) is formed on one side of the first flange (16). A ring (19) is slidably connected in the annular groove (18). A second flange (17) is fixedly connected to one side of the ring (19). A plurality of connecting mechanisms (21) are arranged on the ring (19) to realize the fixation of the second flange (17) and the first flange (16). An oil filling pipe (23) is fixedly connected to the inner circumference of the annular groove (18), and the oil filling pipe (23) penetrates through the circumferential side of the first flange (16). An insertion pipe (8) is arranged in the oil filling pipe (23), and the insertion pipe (8) movably penetrates through the upper end of the first protective box (2) and is fixedly connected to a lubricating oil pipe (7). A piston (15) is slidably connected to the inner circumference of the lubricating oil pipe (7). An air pipe (9) is fixedly connected to one side of the lubricating oil pipe (7), and the air pipe (9) penetrates through the inner top wall of the first protective box (2). Exhaust pipes (10) and air extraction pipes (24) are fixedly connected to both sides of the second protective box (3); Each of the connecting mechanisms (21) includes a plug rod (2101), a circular block (2102), a circular groove (2103), two plugging blocks (2104) and two insertion blocks (2105). The circular groove (2103) is formed on one side wall of the annular groove (18). The plug rod (2101) is rotatably arranged on one side of the ring (19). The circular block (2102) is fixedly connected to one side of the plug rod (2101). The two plugging blocks (2104) are fixedly connected to one side wall of the circular groove (2103). The two insertion blocks (2105) are fixedly connected to the circumference of the circular block (2102). The two insertion blocks (2105) are respectively inserted into the two plugging blocks (2104).

2. The connecting structure of the flange opening of a fiberglass reinforced plastic pipe according to claim 1, wherein: A driving groove (22) is formed on the circumference of the ring (19). A rotating mechanism (20) is arranged between the driving groove (22) and a plurality of circular blocks (2102). The plurality of plug rods (2101) all movably penetrate through one side wall of the driving groove (22). The rotating mechanism (20) includes a gear ring (2001) and a plurality of gears (2002). The plurality of gears (2002) are respectively fixedly connected to one side of the plurality of plug rods (2101). The gear ring (2001) is rotatably connected to one side wall of the driving groove (22). The gear ring (2001) meshes with the plurality of gears (2002).

3. The connecting structure of the flange opening of the FRP pipe according to claim 2, characterized in that: The rotating mechanism (20) further includes a plurality of first threaded grooves (2003) and a plurality of second threaded grooves (2004). The plurality of first threaded grooves (2003) are respectively formed on the inner circumference of the plurality of circular grooves (2103). The plurality of second threaded grooves (2004) are respectively formed on the circumference of the plurality of plug rods (2101).

4. A connecting structure for the flange opening of a fiberglass reinforced plastic pipe according to claim 1, characterized in that: One side of the first protective box (2) and the second protective box (3) is fixedly connected with a first connecting block (13) and a second connecting block (25). A fixing mechanism (14) is arranged between the first connecting block (13) and the second connecting block (25). The fixing mechanism (14) includes two mounting grooves (1401), a clamping groove (1402), two clamping blocks (1403) and two springs (1404). The two mounting grooves (1401) are both opened at the lower end of the second connecting block (25). The clamping groove (1402) is opened at the upper end of the first connecting block (13). The two springs (1404) are respectively fixedly connected to the adjacent side walls of the two mounting grooves (1401). The two clamping blocks (1403) are respectively fixedly connected to the other sides of the two springs (1404), and the two clamping blocks (1403) both movably penetrate through the clamping groove (1402).

5. A connection structure for the flange opening of a fiberglass reinforced plastic pipe according to claim 4, characterized in that: Two limiting rods (1405) are fixedly connected between the side walls of the two mounting grooves (1401). The two clamping blocks (1403) are respectively slidably connected to the circumferential sides of the four limiting rods (1405).

6. A connecting structure for a flange opening of a fiberglass reinforced plastic pipe according to claim 1, characterized in that: A sealing strip (5) is fixedly connected to the lower end of the first protective box (2). Check valves (11) are installed in both the discharge pipe (10) and the air extraction pipe (24).

7. A connecting structure for the flange opening of a fiberglass reinforced plastic pipe according to claim 4, characterized in that: Half pipes (4) are fixedly connected to one side of the first protective box (2) and the second protective box (3). Two third connecting blocks (26) are fixedly connected to the circumferential sides of the two half pipes (4). Two screws (6) are arranged below the two lower third connecting blocks (26), and the four screws (6) are respectively threadedly connected to the two upper third connecting blocks (26).

8. A glass fiber reinforced plastic pipe flange connection structure according to claim 7, characterized in that: A protective shell (12) is fixedly connected to one side of the second connecting block (25) and the two upper third connecting blocks (26).

9. A method of using a connecting structure for a flange opening of a fiberglass reinforced plastic pipe, which uses a connecting structure for a flange opening of a fiberglass reinforced plastic pipe according to any one of claims 1-8, characterized in that, Including the following steps: S1: Insert the ring (19) into the annular groove (18), insert the insertion rod (2101) into the circular groove (2103), rotate the gear ring (2001), the gear ring (2001) drives a plurality of gears (2002) to rotate, the gears (2002) drive the insertion rod (2101) and the circular block (2102) to rotate, the insertion block (2105) rotates along with the circular groove (2103), the insertion block (2105) is inserted into the insertion block (2104). At this time, the circular block (2102) and the second flange (17) are fixed, so that the ring (19) and the second flange (17) are fixed, and thus the first flange (16) and the second flange (17) are fixed; S2: Clamp the first protective box (2) and the second protective box (3) on the pipeline main body (1), the two half pipes (4) are clamped on the circumferential side of the pipeline main body (1), rotate the screws (6) to fix the adjacent third connecting blocks (26), so as to facilitate the fixation of the first protective box (2) and the second protective box (3) to the pipeline main body (1); S3: After the first protective box (2) and the second protective box (3) are fixed in step S2, the clamping block (1403) is inserted into the clamping groove (1402), and the two springs (1404) are in a compressed state. The springs (1404) push the clamping block (1403) to make the clamping block (1403) fit more closely with the clamping groove (1402); S4: Insert the intubation tube (8) into the fuel filling pipe (23), and evacuate the air in the first protective box (2) and the second protective box (3) through the second connecting block (25). When the lubricating oil in the annular groove (18) and the circular ring (19) is vaporized by high temperature, the gas in the first protective box (2) and the second protective box (3) increases. The gas enters the lubricating oil pipe (7) from the trachea (9). The gas pushes the piston (15) to move. The piston (15) moves to push the lubricating oil contained in the lubricating oil pipe (7) into the fuel filling pipe (23) through the intubation tube (8). The fuel filling pipe (23) fills the space between the annular groove (18) and the circular ring (19) with lubricating oil to prevent the reduction of lubricating oil from affecting the airtightness between the second flange (17) and the first flange (16).

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