Flange connecting structure capable of preventing seawater corrosion

Abstract

The invention belongs to the technical field of flange protection, and discloses a seawater corrosion prevention flange connecting structure which comprises a first pipeline, a first flange plate communicating with the left side of the first pipeline, a second flange plate arranged on the left side of the first flange plate and a second pipeline communicating with the left side of the second flange plate. The surface of the first pipeline and the surface of the second pipeline are each sleeved with a seawater corrosion prevention connecting mechanism, each seawater corrosion prevention connecting mechanism comprises two rectangular plates, and rotating rods are arranged at the tops and the bottoms of the outer sides of the rectangular plates in a penetrating mode. According to the flange connecting structure, the phenomenon that a traditional flange connecting structure is prone to being corroded by microorganisms and other salt in seawater is changed, the seawater-proof sealing cover is adopted to cover the surfaces of the first flange plate and the second flange plate, then the inserting rod penetrates into the connecting block, and then the hook-and-loop fastener is attached to the surface of the hook-and-loop fastener; therefore, corrosion by microorganisms and other salt in seawater is avoided, loose connection is avoided, and subsequent fluid conveying quality is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of flange protection, and in particular to a flange connection structure resistant to seawater corrosion. Background Art

[0002] A flange is a disc-shaped part used to connect pipes, valves, pumps, pressure vessels and other equipment. It usually has several bolt holes around the periphery. Two flanges are connected together by bolts, and a gasket is used in the middle to achieve sealing.

[0003] Chinese utility model patent: Publication number "CN208204348U", titled "Anti-corrosion device for main line of seawater pipeline", discloses an anti-corrosion device for main line of seawater pipeline, comprising a main line of seawater pipeline, a blind flange, a screw portion and a corrosion-resistant zinc portion; the screw portion is fixedly mounted on the surface of the blind flange; the corrosion-resistant zinc portion includes a hollow area, the screw portion is arranged in the hollow area, and the surface of the corrosion-resistant zinc portion is in close contact with the surface of the blind flange connected to the screw portion; a main line flange is fixedly mounted on the main line of seawater pipeline, and the main line flange is connected to the blind flange via a fastening component; by fixing a zinc block on the blind flange connected to the main line of seawater pipeline, the corrosion resistance of the seawater pipeline is improved, the service life of the seawater pipeline is extended, and the structure is simple and the operation is convenient. However, the flange connection structure in this technical solution is protected from seawater corrosion by setting zinc blocks on its surface. However, the corrosion resistance effect of zinc blocks alone is not good, especially near elbows or tees. The turbulence and flow rate mutations generated therein cause suspended particles in the seawater to accelerate the wear of the pipe wall at the flow rate change point, destroying the protective oxide film, which can easily lead to local erosion corrosion, resulting in a loose connection and affecting the subsequent fluid transportation quality. Summary of the Invention

[0004] In order to solve the problem in the above-mentioned prior art that the flange relies solely on zinc blocks for corrosion protection, which will cause turbulence and sudden changes in flow rate near the elbow or tee area, and the suspended particles in the seawater accelerate the wear of the pipe wall at the flow rate change point, destroying the protective oxide film, which can easily lead to local erosion corrosion, resulting in loose connections and affecting the subsequent fluid transportation quality, the present invention proposes a flange connection structure that is resistant to seawater corrosion, which has the advantage of being able to prevent seawater corrosion near the elbow or tee pipeline.

[0005] The present invention is realized by the following technical scheme: comprising pipe 2, flange 2, flange 1 and pipe 1 arranged in sequence from left to right, flange 2 and flange 1 are respectively sleeved on pipe 2 and pipe 1, and outer surfaces of pipe 1 and pipe 2 are sleeved with connecting mechanisms; the connecting mechanism comprises two rectangular plates perpendicular to pipe 1 and symmetrically arranged; the tops and bottoms of the two rectangular plates are penetrated by a rotating rod arranged parallel to pipe 2; a circular disc is fixedly connected to one end of the rotating rod close to flange 2, and two convex plates with a collinear shape and a length direction perpendicular to the setting direction of the rectangular plates are fixedly connected to the side of the circular disc close to flange 2, and a transmission pin is fixedly connected to the side of the convex plate away from the rotating rod; the surface of the transmission pin is sleeved with a rotating rod arranged parallel to the rectangular plate A vertical frame is arranged in the same direction, and a horizontal plate is fixedly connected to the side of the vertical frame away from the second pipe. A slider is provided between the horizontal plate and the rectangular plate, the slider is fixedly connected to the horizontal plate, and the slider is slidably connected to the rectangular plate. A connecting rod is provided at each of the four corners of the rectangular plate. A clamping plate is fixedly connected to the outer side of the vertical frame, and the side of the clamping plate away from the vertical frame extends into the interior of the connecting rod. The surfaces of the first and second flanges are both provided with a seawater-proof sealing cover, and the top and bottom of the inner side of the seawater-proof sealing cover are fixedly connected to a connecting block. A gear is sleeved and fixedly connected to the side of the rotating rod away from the second flange. A toothed plate is meshed with the gear on the side close to the second pipe. A limit plate is fixedly connected to the side of the toothed plate close to the rectangular plate. The limit plate extends through the rectangular plate and is slidably connected to the rectangular plate. A fixed block is fixedly connected to the side of the toothed plate away from the rectangular plate, and a plug rod is fixedly connected to the fixed block, and the other end of the plug rod extends into the interior of the connecting block.

[0006] Furthermore, a magic hook patch is fixedly connected to the surface of the seawater-proof sealing cover, and a magic sealing adhesive patch is pasted on the outer side of the magic hook patch.

[0007] Furthermore, a sealing positioning mechanism is fixedly connected to the side of the disc close to flange two, and the sealing positioning mechanism includes a screw rod with one end fixedly connected to the disc and the other end being sleeved with a screw barrel, and the thread inside the screw barrel matches the thread on the surface of the screw rod; an auxiliary plate is fixedly connected to the side of the screw barrel close to pipe two, and an extension plate is slidably connected to the side of the auxiliary plate close to pipe two, and one end of the extension plate is fixedly connected to the rectangular plate; two bent plates are symmetrically arranged on the screw barrel, and the two bent plates are fixedly connected to the screw barrel and the bent plates are parallel to the setting direction of the rectangular plate, and a positioning plate is fixedly connected to the side of the bent plate away from the screw barrel, and a sealing ring is provided on the surface of flange one and the surface of flange two and on the inner side of the seawater-proof sealing cover, and the side of the positioning plate away from the bent plate passes through the interior of the sealing ring.

[0008] Furthermore, the side of the rectangular plate away from the flange two is slidingly connected with two groups of pipe protection mechanisms symmetrically arranged along the direction in which the rectangular plate is set; the pipe protection mechanism includes a folding plate which is slidingly connected to the rectangular plate on one side and fixedly connected to a protective cover on the other side, the inner sides of the protective covers are respectively fitted with pipe one and pipe two, the top and bottom of the folding plate are fixedly connected with an oblique connecting plate, and the inner side of the oblique connecting plate is fixedly connected to the protective cover.

[0009] Furthermore, a movable groove is provided at a corresponding position of the folding plate on a side of the rectangular plate away from the second flange, and the folding plate cooperates with the movable groove.

[0010] Furthermore, an auxiliary groove is provided in the portion of the extension plate away from the rectangular plate and the second pipe. The auxiliary groove is opened along the length direction of the second pipe, and the side of the auxiliary plate away from the positioning plate is slidably connected to the inside of the auxiliary groove.

[0011] Furthermore, a corner block is fixedly connected between the extension plate and the rectangular plate, and the corner block is fixedly connected to both the extension plate and the rectangular plate.

[0012] Furthermore, a sliding groove is provided at the position where the rectangular plate contacts the slider, and the slider is slidably connected inside the sliding groove.

[0013] Furthermore, one end of the rotating rod away from the rectangular plate is fixedly connected to a rotating disk, and one side of the rotating disk away from the rotating rod is fixedly connected to a handle.

[0014] Furthermore, there are two grips, which are symmetrically arranged along the center of the turntable.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The flange connection structure of the present invention changes the traditional phenomenon that it is easily corroded by microorganisms and other salts in seawater. It uses a seawater-proof sealing cover to cover the surface of flange plate 1 and flange plate 2, and then inserts the rod into the interior of the connecting block, and then sticks the magic seal on the surface of the magic hook. It will not be corroded by microorganisms and other salts in seawater, will not cause the connection to be loose, and will not affect the subsequent fluid transportation quality.

[0017] 2. The present invention can seal the connection between flange 1 and flange 2 by providing a sealing positioning mechanism to prevent leakage.

[0018] 3. The present invention can protect pipeline 1 and pipeline 2 by setting up the pipeline protection mechanism to avoid the phenomenon of being cracked by external forces.

[0019] 4. The present invention provides a movable groove, which enables the folding plate to slide more smoothly inside the rectangular plate, reduces the friction between the folding plate and the rectangular plate, prolongs the service life of the folding plate, and at the same time has a limiting effect on the folding plate.

[0020] 5. The present invention provides the auxiliary groove, which enables the auxiliary plate to move more stably and prevents tilting.

[0021] 6. The present invention can make the extension plate more firmly connected to the rectangular plate by setting the corner blocks, thus avoiding the phenomenon of the two being separated.

[0022] 7. The present invention provides a sliding groove, which enables the slider to slide more smoothly inside the rectangular plate, thereby reducing friction between the two.

[0023] 8. The present invention can facilitate the installer to rotate the rotating rod by providing the rotary disk and the gripping rod, thereby increasing the convenience of the installer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic exploded view of the overall structure of the present invention.

[0026] Figure 3 for Figure 2 A partial enlarged schematic diagram of point A in the middle.

[0027] Figure 4 This is a schematic diagram of the connection structure of pipeline 1, flange 1, flange 2 and pipeline 2 of the present invention.

[0028] Figure 5 It is a partially enlarged schematic diagram of the seawater-proof sealing cover and the connecting block structure of the present invention.

[0029] Figure 6 It is a schematic diagram of the internal structure of the present invention.

[0030] Indicated in the figure:

[0031] 1. Pipe 1; 2. Flange 1; 3. Flange 2; 4. Pipe 2; 5. Connecting mechanism; 6. Rectangular plate; 7. Rotating rod; 8. Disc; 9. Raised plate; 10. Transmission pin; 11. Vertical frame; 12. Horizontal plate; 13. Slider; 14. Connecting rod; 15. Clamping plate; 16. Seawater-proof seal; 17. Connecting block; 18. Gear; 19. Tooth plate; 20. Limiting plate; 21. Fixing block; 22. Inserting rod; 2 3. Magic hook sticker; 24. Magic sealing sticker; 25. Sealing positioning mechanism; 26. Screw; 27. Screw barrel; 28. Auxiliary plate; 29. ​​Extension plate; 30. Bending plate; 31. Positioning plate; 32. Sealing ring; 33. Pipe protection mechanism; 34. Folding plate; 35. Protective cover; 36. Diagonal connecting plate; 37. Moving groove; 38. Auxiliary groove; 39. Corner block; 40. Slide groove; 41. Turntable; 42. Grip. DETAILED DESCRIPTION

[0032] The advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings.

[0033] like Figures 1 to 6As shown, the present invention provides a flange connection structure that resists seawater corrosion. The structure comprises, from left to right, a pipe 2 4, a flange 2 3, a flange 1 2, and a pipe 1 1. The flange 2 3 and flange 1 2 are respectively mounted on pipe 2 4 and pipe 1 1. A connecting mechanism 5 is mounted on the outer surfaces of each pipe 1 and pipe 2 4. The connecting mechanism 5 comprises two rectangular plates 6, which are arranged perpendicular to pipe 1 1 or pipe 2 4 and symmetrically relative to the joint plane of flange 2 3 and flange 1 2. A rotating rod 7 is provided through the top and bottom of each rectangular plate 6, and the rotating rod 7 is arranged parallel to pipe 2 4. A circular disc 8 is fixedly connected to the end of the rotating rod 7 near flange 2 3. Two protruding plates 9 are fixedly connected to the side of the circular disc 8 near flange 2 3. The two protruding plates 9 are respectively arranged on either side of the rotating rod 7 and are collinear. The length direction of the protruding plates 9 is perpendicular to the arrangement direction of the rectangular plates 6. A driving pin 10 is fixedly connected to the side of the protruding plate 9 away from the rotating rod 7. A mullion 11 is sleeved onto the surface of the drive pin 10. The mullion 11 is positioned in the same orientation as the rectangular plate 6. A horizontal plate 12 is fixedly connected to the side of the mullion 11 facing away from the second pipe 4. A slider 13 is positioned between the horizontal plate 12 and the rectangular plate 6. The slider 13 is fixedly connected to the horizontal plate 12 and slidably connected to the rectangular plate 6. Connecting rods 14 are provided through each of the four corners of the rectangular plate 6, parallel to the second pipe 4. A clip 15 is fixedly connected to the outside of the mullion 11. The side of the clip 15 facing away from the mullion 11 extends into the interior of the connecting rod 14. The surfaces of both flange 1 2 and flange 2 3 are provided with a seawater-proof sealing cover 16, and the top and bottom of the inner side of the seawater-proof sealing cover 16 are fixedly connected to a connecting block 17. The side of the rotating rod 7 away from flange 2 3 is sleeved and fixedly connected to a gear 18, and the gear 18 is meshed with a toothed plate 19 on the side close to pipe 2 4. The side of the toothed plate 19 close to the rectangular plate 6 is fixedly connected to a limit plate 20, and the limit plate 20 passes through the rectangular plate 6 and is slidably connected to the rectangular plate 6. The side of the toothed plate 19 away from the rectangular plate 6 is fixedly connected to a fixed block 21, and the fixed block 21 is fixedly connected to an insertion rod 22, the other end of which passes through the interior of the connecting block 17. The surface of the seawater-proof sealing cover 16 is fixedly connected to a magic hook patch 23, and the outer side of the magic hook patch 23 is affixed with a magic sealing adhesive patch 24.

[0034] like Figure 2 and Figure 3The side of the disc 8 near the flange 2 3 is fixedly connected to a sealing positioning mechanism 25. The sealing positioning mechanism 25 includes a screw 26. One end of the screw 26 is fixedly connected to the disc 8, and the other end is sleeved with a screw barrel 27. The internal thread of the screw barrel 27 matches the thread on the surface of the screw 26. The side of the screw barrel 27 near the pipe 2 4 is fixedly connected to an auxiliary plate 28. The side of the auxiliary plate 28 near the pipe 2 4 is slidably connected to an extension plate 29. One end of the extension plate 29 is fixedly connected to the rectangular plate 6. Two bent plates 30 are symmetrically arranged on the screw barrel 27. The two bent plates 30 are fixedly connected to the screw barrel 27 and the bent plates 30 are parallel to the setting direction of the rectangular plate 6. The side of the bent plates 30 away from the screw barrel 27 is fixedly connected to a positioning plate 31. The surface of the flange 1 2 and the surface of the flange 2 3 and located on the inner side of the seawater-proof sealing cover 16 are both provided with a sealing ring 32. The side of the positioning plate 31 away from the bent plate 30 extends through the interior of the sealing ring 32.

[0035] As a technical optimization solution of the present invention, by providing the sealing positioning mechanism 25, the connection between the flange 1 2 and the flange 2 3 can be sealed to prevent leakage.

[0036] like Figure 2 As shown, the side of the rectangular plate 6 away from the flange 2 3 is slidably connected to a pipe protection mechanism 33. The pipe protection mechanisms 33 are two sets, symmetrically arranged along the direction in which the rectangular plate 6 is arranged. The pipe protection mechanism 33 includes a folding plate 34, one side of which is slidably connected to the rectangular plate 6. The side of the folding plate 34 away from the rectangular plate 6 is fixedly connected to a protective cover 35. The inner sides of the protective cover 35 respectively fit the pipe 1 and the pipe 2 4. The top and bottom of the folding plate 34 are fixedly connected to an inclined connecting plate 36, and the inner side of the inclined connecting plate 36 is fixedly connected to the protective cover 35.

[0037] As a technical optimization solution of the present invention, by setting the pipeline protection mechanism 33, pipeline 1 and pipeline 2 4 can be protected to avoid being cracked by external forces.

[0038] like Figure 2 As shown, a movable groove 37 is provided at a corresponding position of the folding plate 34 on the side of the rectangular plate 6 away from the second flange 3, and the folding plate 34 cooperates with the movable groove 37 to slide.

[0039] As a technical optimization solution of the present invention, the setting of the movable groove 37 can enable the folding plate 34 to slide more smoothly inside the rectangular plate 6, reducing the friction between the folding plate 34 and the rectangular plate 6, extending the service life of the folding plate 34, and at the same time having a limiting effect on the folding plate 34.

[0040] like Figure 3As shown, the extension plate 29 is provided with an auxiliary groove 38 at a portion away from the rectangular plate 6 and away from the pipe 2 4 . The auxiliary groove 38 is opened along the length direction of the pipe 2 4 , and the side of the auxiliary plate 28 away from the positioning plate 31 is slidably connected to the inside of the auxiliary groove 38 .

[0041] As a technical optimization solution of the present invention, the provision of the auxiliary groove 38 can enable the auxiliary plate 28 to move more stably and prevent tilting.

[0042] like Figure 3 As shown, a corner block 39 is fixedly connected between the extension plate 29 and the rectangular plate 6 , and the corner block 39 is fixedly connected to both the extension plate 29 and the rectangular plate 6 .

[0043] As a technical optimization solution of the present invention, the provision of the corner block 39 can make the extension plate 29 more firmly connected to the rectangular plate 6, thereby avoiding the phenomenon of the two being separated.

[0044] like Figure 3 As shown, a sliding groove 40 is provided at the position where the rectangular plate 6 contacts the slider 13 , and the slider 13 is slidably connected inside the sliding groove 40 .

[0045] As a technical optimization solution of the present invention, the provision of the sliding groove 40 can enable the slider 13 to slide more smoothly inside the rectangular plate 6, thereby reducing friction between the two.

[0046] like Figure 2 As shown, the end of the rotating rod 7 away from the rectangular plate 6 is fixedly connected to the rotary disk 41, and the side of the rotary disk 41 away from the rotating rod 7 is fixedly connected to the grip 42. Preferably, the grip 42 is two in number and is symmetrically arranged along the center of the rotary disk 41.

[0047] As a technical optimization solution of the present invention, the provision of the rotary disk 41 and the grip 42 can facilitate the installer to rotate the rotating rod 7, thereby increasing the convenience of the installer.

[0048] The working principle and usage process of the present invention are as follows: First, the user fits flange 1 2 and flange 2 3 together, then passes the connecting rod 14 through the four corners of the rectangular plate 6, and then rotates the grip 42, the grip 42 drives the rotary disk 41 to rotate, the rotary disk 41 drives the rotating rod 7 to rotate, the rotating rod 7 drives the disc 8 and the convex plate 9 to move outward, the convex plate 9 drives the transmission pin 10 to rotate, the transmission pin 10 drives the vertical frame 11 to move outward, the vertical frame 11 drives the card plate 15 to move outward, so that the card plate 15 passes through the inside of the connecting rod 14, and then covers the surface of flange 1 2 and flange 2 3 with the seawater-proof sealing cover 16, and then the gear 18 rotates as the rotating rod 7 rotates, the gear 18 drives the tooth plate 19 to move outward, and the tooth plate 19 drives the fixing block 21 and the insertion rod 22 Move outward so that the insertion rod 22 passes through the inside of the connecting block 17, fixing the position of the seawater-proof sealing cover 16, and then sticking the magic sealing adhesive 24 on the surface of the magic hook 23 to achieve the effect of preventing seawater corrosion near the elbow or the three-way pipe. Then, the disc 8 rotates while driving the screw rod 26 to rotate, and the screw rod 26 drives the screw barrel 27 to rotate. The screw barrel 27 drives the bent plate 30 and the positioning plate 31 to move inward, so that the positioning plate 31 passes through the inside of the sealing ring 32, so as to achieve the effect of sealing and positioning the connection between the flange 1 2 and the flange 2 3. Then, push the folding plate 34 again, and the folding plate 34 drives the protective cover 35 to move inward, so that the protective cover 35 covers the surfaces of pipe 1 1 and pipe 2 4 respectively, so as to achieve the effect of protecting them.

[0049] To sum up: this flange connection structure that is resistant to seawater corrosion has changed the traditional phenomenon of being easily corroded by microorganisms and other salts in seawater through the flange connection structure. A seawater-proof sealing cover 16 is used to cover the surface of flange 1 2 and flange 2 3, and then the inserted rod 22 is passed through the interior of the connecting block 17, and then the magic sealing adhesive 24 is attached to the surface of the magic hook 23. It will not be corroded by microorganisms and other salts in seawater, will not cause the connection to be loose, and will not affect the subsequent fluid transportation quality.

[0050] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A flange connection structure for preventing seawater corrosion, comprising a pipe 2 (4), a flange 2 (3), a flange 1 (2) and a pipe 1 (1) arranged in sequence from left to right, wherein the flange 2 (3) and the flange 1 (2) are respectively sleeved on the pipe 2 (4) and the pipe 1 (1), and characterized in that: The outer surfaces of the pipe 1 (1) and the pipe 2 (4) are both sleeved with a connecting mechanism (5); the connecting mechanism (5) comprises two rectangular plates (6) which are perpendicular to the pipe 1 (1) and symmetrically arranged; the top and bottom of the two rectangular plates (6) are both penetrated by a rotating rod (7) which is arranged parallel to the pipe 2 (4); the rotating rod (7) is fixedly connected to a disc (8) at one end close to the flange 2 (3); the side of the disc (8) close to the flange 2 (3) is fixedly connected to two convex plates (9) which are collinear and whose length direction is perpendicular to the setting direction of the rectangular plates (6); the side of the convex plate (9) away from the rotating rod (7) is fixedly connected to a transmission pin (10); the surface of the transmission pin (10) is sleeved with a vertical frame (11) which is in the same setting direction as the rectangular plates (6); the side of the vertical frame (11) away from the pipe 2 (4) is fixedly connected to a horizontal plate (12); a slider (13) is arranged between the horizontal plate (12) and the rectangular plate (6). The slider (13) is fixedly connected to the horizontal plate (12), and the slider (13) is slidably connected to the rectangular plate (6); the four corners of the rectangular plate (6) are all penetrated by a connecting rod (14), the outer side of the vertical frame (11) is fixedly connected to a card plate (15), and the side of the card plate (15) away from the vertical frame (11) penetrates into the interior of the connecting rod (14); the surfaces of the flange plate 1 (2) and the flange plate 2 (3) are both provided with a seawater-proof sealing cover (16), and the top and bottom of the inner side of the seawater-proof sealing cover (16) are fixedly connected to a connecting block (17); the side of the rotating rod (7) away from the flange plate 2 (3) is sleeved and fixedly connected with a gear (18), the gear (18) is meshed with a tooth plate (19) on the side close to the pipe 2 (4), and the side of the tooth plate (19) close to the rectangular plate (6) is fixedly connected to a limit plate (20), and the limit plate (20) penetrates the rectangular plate (6) and is slidably connected to the rectangular plate (6). A fixed block (21) is fixedly connected to the side of the tooth plate (19) away from the rectangular plate (6), and an insertion rod (22) is fixedly connected to the fixed block (21), and the other end of the insertion rod (22) passes through the interior of the connection block (17).

2. The seawater corrosion resistant flange connection structure according to claim 1, characterized in that: The surface of the seawater-proof sealing cover (16) is fixedly connected with a magic hook patch (23), and the outer side of the magic hook patch (23) is pasted with a magic sealing adhesive patch (24).

3. The seawater corrosion resistant flange connection structure according to claim 2, characterized in that: The disc (8) is fixedly connected to a sealing positioning mechanism (25) on one side close to the flange plate 2 (3). The sealing positioning mechanism (25) comprises a screw rod (26) with one end fixedly connected to the disc (8) and the other end sleeved with a screw barrel (27). The internal thread of the screw barrel (27) matches the thread on the surface of the screw rod (26); the screw barrel (27) is fixedly connected to an auxiliary plate (28) on one side close to the pipe 2 (4). The auxiliary plate (28) is slidably connected to an extension plate (29) on one side close to the pipe 2 (4). One end of the extension plate (29) is fixedly connected to the rectangular The plate (6) is fixedly connected; two bent plates (30) are symmetrically arranged on the screw barrel (27), the two bent plates (30) are fixedly connected to the screw barrel (27) and the bent plates (30) are parallel to the setting direction of the rectangular plate (6), the side of the bent plate (30) away from the screw barrel (27) is fixedly connected with a positioning plate (31), the surface of the flange plate 1 (2) and the surface of the flange plate 2 (3) and located on the inner side of the seawater-proof sealing cover (16) are both provided with a sealing ring (32), and the side of the positioning plate (31) away from the bent plate (30) penetrates into the interior of the sealing ring (32).

4. The seawater corrosion resistant flange connection structure according to claim 3, characterized in that: The rectangular plate (6) is slidably connected to one side away from the second flange (3) with two groups of pipeline protection mechanisms (33) symmetrically arranged along the direction in which the rectangular plate (6) is arranged; the pipeline protection mechanism (33) comprises a folding plate (34) slidably connected to the rectangular plate (6) on one side and fixedly connected to a protective cover (35) on the other side, the inner side of the protective cover (35) is respectively fitted with the first pipeline (1) and the second pipeline (4), the top and bottom of the folding plate (34) are fixedly connected to an oblique connecting plate (36), and the inner side of the oblique connecting plate (36) is fixedly connected to the protective cover (35).

5. The seawater corrosion resistant flange connection structure according to claim 4, characterized in that: A movable groove (37) is provided at a corresponding position of a folding plate (34) provided on one side of the rectangular plate (6) away from the second flange (3), and the folding plate (34) cooperates with the movable groove (37).

6. The seawater corrosion resistant flange connection structure according to claim 3, characterized in that: An auxiliary groove (38) is provided on the portion of the extension plate (29) away from the rectangular plate (6) and away from the second pipe (4). The auxiliary groove (38) is provided along the length direction of the second pipe (4). The side of the auxiliary plate (28) away from the positioning plate (31) is slidably connected to the inside of the auxiliary groove (38).

7. The seawater corrosion resistant flange connection structure according to claim 3, characterized in that: A corner block (39) is fixedly connected between the extension plate (29) and the rectangular plate (6), and the corner block (39) is fixedly connected to both the extension plate (29) and the rectangular plate (6).

8. The seawater corrosion resistant flange connection structure according to claim 1, characterized in that: A sliding groove (40) is provided at the position where the rectangular plate (6) contacts the slider (13), and the slider (13) is slidably connected inside the sliding groove (40).

9. The seawater corrosion resistant flange connection structure according to claim 4, characterized in that: One end of the rotating rod (7) away from the rectangular plate (6) is fixedly connected to a rotating disk (41), and one side of the rotating disk (41) away from the rotating rod (7) is fixedly connected to a gripping rod (42).

10. The seawater corrosion resistant flange connection structure according to claim 9, characterized in that: There are two gripping rods (42) which are symmetrically arranged along the center of the rotating disk (41).

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