Flange and processing method thereof

Abstract

The present invention relates to the field of flange processing technology, specifically to a flange with good sealing effect, including a first connecting flange and a second connecting flange, an annular thread groove is provided on the inner ring of the inner side surface of the first connecting flange, and a threaded ring body is provided on the inner ring of the inner side surface of the second connecting flange; a first connecting disk is provided on one side of the outer ring of the first connecting flange, a second connecting disk is rotatably provided on one side of the outer ring of the second connecting flange, and a sealing gasket structure is provided between the second connecting disk and the first connecting disk; a plurality of first through hole structures are provided on the first connecting disk, a connecting rod is provided between every two first through hole structures, a plurality of first threaded rods are provided on the second connecting disk, and a plurality of second through holes are provided on the second connecting disk; the first threaded rod penetrates the sealing gasket structure and the first through hole structure and is fixedly connected by a nut, and the connecting rod penetrates the sealing gasket structure and the second through hole and is fixedly connected by a bolt. The present invention improves the connection and fixing effect of the flange, thereby being able to improve the sealing after the flange is connected.

Description

Technical Field

[0001] The invention relates to a flange, in particular to a flange and a processing method thereof, belonging to the technical field of flange processing. Background Art

[0002] Flange, also known as flange flange or flange; flange is a part that connects shafts to each other and is used to connect pipe ends; there are also flanges used on the inlet and outlet of equipment, used to connect two devices, such as reducer flanges; flange connection or flange joint refers to a detachable connection that is connected by flanges, gaskets and bolts as a combined sealing structure; pipe flange refers to the flange used for piping in pipeline devices, and when used on equipment, it refers to the inlet and outlet flanges of the equipment; there are holes on the flange, and bolts connect the two flanges tightly; gaskets are used to seal between flanges; flanges are divided into threaded flanges, welding flanges and clamping flanges; flanges are used in pairs, and threaded flanges can be used for low-pressure pipelines, and welding flanges can be used for pressures above four kilograms. Add a sealing gasket between the two flanges and then tighten them with bolts; flanges of different pressures have different thicknesses, and they use different bolts; when water pumps and valves are connected to pipelines, parts of these equipment are also made into corresponding flange shapes, also called flange connections;

[0003] The existing flanges may have poor sealing effects after connection, which may lead to air leakage and water leakage in the later stage.

[0004] Therefore, it is urgent to improve the flange to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a flange, which can improve the fixing effect of the flange during connection, so that the flanges are connected more tightly, so that the flanges can have a better sealing effect after being connected and fixed, ensuring that there will be no air leakage or water leakage in the later stage.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] A flange comprises a first connecting flange and a second connecting flange, wherein an inner circle of an inner side surface of the first connecting flange is provided with an annular thread groove, and an inner circle of an inner side surface of the second connecting flange is provided with a threaded ring body adapted to the annular thread groove;

[0008] A first connection plate is arranged on a side of the outer ring of the first connection flange close to the second connection flange, a second connection plate is rotatably arranged on a side of the outer ring of the second connection flange close to the first connection flange, and a sealing gasket structure is arranged between the second connection plate and the first connection plate;

[0009] The first connecting plate is provided with a plurality of first through hole structures, a connecting rod is arranged between every two of the first through hole structures, the second connecting plate is provided with a plurality of first threaded rods, and the second connecting plate is provided with a plurality of second through holes; the first threaded rod passes through the sealing gasket structure and the first through hole structure and is fixedly connected by a nut, and the connecting rod passes through the sealing gasket structure and the second through hole and is fixedly connected by a bolt.

[0010] Preferably, the sealing gasket structure includes a first sealing gasket and a second sealing gasket, the first sealing gasket and the second sealing gasket are fitted and adsorbed, a side of the first sealing gasket close to the second sealing gasket is provided with a plurality of positioning grooves, a first magnet is arranged in each of the positioning grooves, and a side of the second sealing gasket close to the first sealing gasket is provided with a plurality of adsorption magnetic blocks that are adsorbed with the first magnet.

[0011] Preferably, the first sealing gasket and the second sealing gasket are both provided with a plurality of third through holes, a fourth through hole is provided between every two of the third through holes, the first threaded rod passes through the third through holes and the first through hole structure, and the connecting rod passes through the fourth through hole and the second through hole.

[0012] Preferably, an internal threaded hole is formed at one end of the connecting rod away from the first connecting flange, and the bolt is screwed into and connected with the internal threaded hole. The diameter of the end of the bolt away from the internal threaded hole is larger than the diameter of the second through hole.

[0013] Preferably, the first through hole structure includes a circular through hole structure and a hexagonal through hole structure, the circular through hole structure is close to the second connecting flange, the nut is clamped inside the hexagonal through hole structure, and the first threaded rod sequentially passes through the circular through hole structure and the hexagonal through hole structure and is fixed by the nut.

[0014] Preferably, an annular groove is provided on a side of the outer surface of the second connecting flange close to the first connecting flange, and an annular block rotatably connected to the annular groove is provided on the inner ring of the second connecting plate.

[0015] Preferably, a third internal threaded hole is provided on the upper end surface of the hexagonal through hole structure, and the third internal threaded hole penetrates to the surface of the first connecting plate. A fourth internal threaded hole is provided on two corresponding sides of the nut, and the fourth internal threaded hole is communicated with the third internal threaded hole and is connected by a second bolt.

[0016] Preferably, a plurality of fifth threaded holes are also formed on the outer ring surface of the second connecting plate, and a fifth threaded rod is screwed into and connected to the fifth threaded hole.

[0017] Preferably, the first sealing gasket and the second sealing gasket are of the same size, and the inner diameters of the first sealing gasket and the second sealing gasket are the same as the diameters of the first connecting disk and the second connecting disk.

[0018] A flange processing method comprises the following steps:

[0019] S1: Processing of the first flange: a circular thread groove is formed on the inner ring of the inner side surface of the first connecting flange by using a slotting machine, and then a first connecting plate is welded on the inner side of the outer ring of the first connecting flange, and then a plurality of first through-hole structures are formed on the inner side surface of the first connecting plate by using a punching machine. When processing the first through-hole structure, one side close to the second connecting flange is processed into a circular through-hole structure, and the other side is processed into a hexagonal through-hole structure, and then a third internal threaded hole is formed on the upper end surface of the hexagonal through-hole structure, and a fourth internal threaded hole is formed on the surface of the nut, and then a plurality of connecting rods are welded on the inner side surface of the first connecting plate, and then an internal threaded hole is formed on the end surface of each of the connecting rods;

[0020] S2: Sealing gasket structure processing: select two sealing gaskets, open a third through hole and a fourth through hole corresponding to a plurality of positions on the first sealing gasket and the second sealing gasket, then open a positioning groove on the inner side of the first sealing gasket and embed the first magnet inside, and weld an adsorption magnetic block corresponding to the position of the first magnet on the inner side of the second sealing gasket;

[0021] S3: Processing of the second flange: an annular groove is opened on the surface of the second connecting flange close to the first connecting flange, and then a second connecting plate is clamped on the surface of the second connecting flange, a plurality of first threaded rods are welded on the inner side surface of the second connecting plate, a threaded ring body is welded on the inner side surface of the second connecting flange, a fifth threaded hole is opened on the surface of the second connecting plate, and a fifth threaded rod is screwed and connected in the fifth threaded hole.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. By using a sealing gasket structure composed of multiple sealing gaskets to fix between flanges, and then using multiple threaded rods for connection and fixing, the fixing effect of the flanges during connection can be improved, so that the connection between the flanges is tighter, so that the flanges can have a better sealing effect after connection and fixing, ensuring that there will be no air leakage or water leakage in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is the explosion effect diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the connection three-dimensional structure of the present invention;

[0027] Figure 3 It is a connection cross-sectional schematic diagram of the present invention;

[0028] Figure 4 It is a schematic diagram of the exploded three-dimensional structure of the second connecting flange of the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the first connecting flange of the present invention;

[0030] Figure 6 It is a cross-sectional view of a nut of the present invention.

[0031] In the figure, 1-first connecting flange, 2-second connecting flange, 3-sealing gasket structure, 4-annular threaded groove, 5-threaded ring body, 6-first through hole structure, 7-connecting rod, 8-first threaded rod, 9-second through hole, 10-bolt, 11-first sealing gasket, 12-second sealing gasket, 13-positioning groove, 14-first magnet, 15-adsorption magnetic block, 16-third through hole, 17-fourth through hole, 18-inner threaded hole, 19-circular through hole structure, 20-hexagonal through hole structure, 21-nut, 22-first connecting plate, 23-second connecting plate, 24-annular groove, 25-annular block, 26-third inner threaded hole, 27-fourth inner threaded hole, 28-second bolt, 29-fifth threaded hole, 30-fifth threaded rod. DETAILED DESCRIPTION

[0032] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] like Figure 1-Figure 6As shown, the flange provided in this embodiment includes a first connecting flange 1 and a second connecting flange 2. The inner circle of the inner side surface of the first connecting flange 1 is provided with an annular thread groove 4, and the inner circle of the inner side surface of the second connecting flange 2 is provided with a threaded ring body 5 adapted to the annular thread groove 4. When the first connecting flange 1 and the second connecting flange 2 are preliminarily connected, the threaded ring body 5 is driven to rotate in the annular thread groove 4 by rotating the second connecting flange 2 body, so that the first connecting flange 1 and the second connecting flange 2 are preliminarily connected and fixed;

[0034] A first connection plate 22 is provided on the side of the outer ring of the first connection flange 1 close to the second connection flange 2, a second connection plate 23 is rotatably provided on the side of the outer ring of the second connection flange 2 close to the first connection flange 1, an annular groove 24 is provided on the side of the outer surface of the second connection flange 2 close to the first connection flange 1, an annular block 25 rotatably connected to the annular groove 24 is provided on the inner ring of the second connection plate 23, and the arrangement of the annular groove 24 and the annular block 25 enables the second connection plate 23 to have a rotation effect on the surface of the second connection flange 2;

[0035] A sealing gasket structure 3 is arranged between the second connecting disk 23 and the first connecting disk 22; the sealing gasket structure 3 includes a first sealing gasket 11 and a second sealing gasket 12, the first sealing gasket 11 and the second sealing gasket 12 are fitted and adsorbed, a side of the first sealing gasket 11 close to the second sealing gasket 12 is provided with a plurality of positioning grooves 13, each positioning groove 13 is provided with a first magnet 14, a side of the second sealing gasket 12 close to the first sealing gasket 11 is provided with a plurality of adsorption magnetic blocks 15 adsorbed with the first magnet 14, when the flange is connected, the sealing gasket structure 3 is first combined, when combined, the first sealing gasket 11 and the second sealing gasket 12 are fitted, the adsorption magnetic block 15 is stuck into the positioning groove 13 and adsorbed and fixed with the first magnet 14, so as to realize the fixed fitting of the first sealing gasket 11 and the second sealing gasket 12;

[0036] A plurality of first through-hole structures 6 are provided on the first connection plate 22. The first through-hole structures 6 include a circular through-hole structure 19 and a hexagonal through-hole structure 20. The circular through-hole structure 19 is close to the second connection flange 2. The nut 21 is clamped inside the hexagonal through-hole structure 20. The first threaded rod 8 passes through the circular through-hole structure 19 and the hexagonal through-hole structure 20 in sequence and is fixed by the nut 21. The setting of the hexagonal through-hole structure 20 enables the nut 21 to be rotatably connected with the first threaded rod 8 and then clamped into the hexagonal through-hole structure 20 to fix the nut 21 and ensure that the nut 21 does not rotate.

[0037] A connecting rod 7 is provided between every two first through hole structures 6. An internal threaded hole 18 is provided at one end of the connecting rod 7 away from the first connecting flange 1. A bolt 10 is screwed and connected with the internal threaded hole 18. The diameter of the end of the bolt 10 away from the internal threaded hole 18 is larger than the diameter of the second through hole 9. When the flanges are connected, the connecting rod 7 will pass through the fourth through hole 17 and the second through hole 9. Then, the bolt 10 is screwed and connected with the internal threaded hole 18 and gradually tightened so that the inner surface of the bolt 10 is tightly fitted with the outer surface of the second connecting plate 23.

[0038] A plurality of first threaded rods 8 are provided on the second connecting plate 23, and a plurality of second through holes 9 are provided on the second connecting plate 23; the first threaded rod 8 penetrates the sealing gasket structure 3 and the first through hole structure 6 and is fixedly connected by a nut 21, and the connecting rod 7 penetrates the sealing gasket structure 3 and the second through hole 9 and is fixedly connected by a bolt 10; a plurality of third through holes 16 are provided on the first sealing gasket 11 and the second sealing gasket 12, and a fourth through hole 17 is provided between every two third through holes 16, the first threaded rod 8 penetrates the third through hole 16 and the first through hole structure 6, and the connecting rod 7 penetrates the fourth through hole 17 and the second through hole 9. When the flange is connected, the first threaded rod 8 will penetrate the third through hole 16 and the first through hole structure 6, and the connecting rod 7 will penetrate the fourth through hole 17 and the second through hole 9, and then will be screwed and connected with the first threaded rod 8 through the nut 21, and the bolt 10 will be screwed and connected with the internal threaded hole 18, thereby realizing the connection and fixation of the flange.

[0039] In this embodiment, if Figure 1 and Figure 3 As shown, a third internal threaded hole 26 is provided on the upper end surface of the hexagonal through hole structure 20, and the third internal threaded hole 26 penetrates to the surface of the first connecting plate 22. A fourth internal threaded hole 27 is provided on two corresponding sides of the nut 21, and the fourth internal threaded hole 27 is communicated with the third internal threaded hole 26 and is penetrated and connected by a second bolt 28. The third internal threaded hole 26, the fourth internal threaded hole 27 and the second bolt 28 are arranged. After the nut 21 fixes the first threaded rod 8, the fourth internal threaded hole 27 arranged on the nut 21 will be communicated with the third internal threaded hole 26, and then the third internal threaded hole 26 and the fourth internal threaded hole 27 are penetrated and fixed by the second bolt 28, so as to prevent the nut 21 from shaking and separating from the first threaded rod 8, thereby improving the stability after the flange connection.

[0040] In this embodiment, if Figure 1As shown, the outer ring surface of the second connecting disk 23 is also provided with a plurality of fifth threaded holes 29, and a fifth threaded rod 30 is screwed and connected inside the fifth threaded hole 29. The fifth threaded rod 30 is screwed and connected to the fifth threaded hole 29. When there is no need to rotate the second connecting disk 23, the fifth threaded rod 30 will shrink into the fifth threaded hole 29 and be hidden. When it is necessary to rotate the second connecting disk 23, the fifth threaded rod 30 can be rotated out to facilitate the rotation of the second connecting disk 23.

[0041] In this embodiment, if Figure 1 As shown, the first sealing gasket 11 and the second sealing gasket 12 are of the same size, and the inner diameters of the first sealing gasket 11 and the second sealing gasket 12 are the same as the diameters of the first connecting plate 22 and the second connecting plate 23, thereby ensuring good sealing when the flanges are connected without affecting the rotation and connection between the threaded ring body 5 and the annular thread groove 4.

[0042] like Figure 1-Figure 6As shown, the principle of the flange with a quick connection effect provided in this embodiment is as follows: when the flange is connected and fixed, the sealing gasket structure 3 is first combined, and when combined, the first sealing gasket 11 and the second sealing gasket 12 are fitted together, and the adsorption magnetic block 15 is stuck into the positioning groove 13 and adsorbed and fixed with the first magnet 14, thereby realizing the fixed fitting of the first sealing gasket 11 and the second sealing gasket 12; then the sealing gasket structure 3 is fitted with the second connecting disk 23, and when the sealing gasket structure 3 and the second connecting disk 23 are fitted together, the first threaded rod 8 will penetrate the third through hole 16, and then the first connecting flange 1 and the second connecting flange 2 are fitted and brought close to each other, and the first threaded rod 8 will penetrate the first through hole structure 6, and then by rotating the second connecting flange 2 body, the threaded ring body 5 is driven to rotate in the annular thread groove 4, so that the first connecting flange 1 and the second connecting flange 2 are preliminarily connected and fixed. During the rotation of the second connecting flange 2 body, since the second connecting disk 23 has a rotation effect, in the second connection method During the rotation of the flange 2 body, the second connecting plate 23 will never follow the rotation. During the preliminary connection between the first connecting flange 1 and the second connecting flange 2, the connecting rod 7 will also penetrate the fourth through hole 17 and the second through hole 9. After the first connecting flange 1 and the second connecting flange 2 are initially fixed, the two are tightly fitted. Then, a nut 21 is sleeved on the part of the first threaded rod 8 protruding from the first through hole structure 6, and then rotated until the nut 21 is rotated into the hexagonal through hole structure 20 for fixation. At this time, the fourth internal threaded hole 27 will be connected to the third internal threaded hole 26, and then the third internal threaded hole 26 and the fourth internal threaded hole 27 are penetrated and fixed by the second bolt 28, so as to prevent the nut 21 from shaking and separating from the first threaded rod 8, thereby improving the stability after the flange connection. Finally, the bolt 10 is used to rotate and connect with the internal threaded hole 18 opened on the connecting rod 7, and gradually tightened so that the inner surface of the bolt 10 is tightly fitted with the outer surface of the second connecting plate 23, thereby realizing the final fixed connection of the flange.

[0043] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0044] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0045] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A flange, comprising a first connecting flange (1) and a second connecting flange (2), characterized in that: An inner circle of the inner side surface of the first connecting flange (1) is provided with an annular thread groove (4), and an inner circle of the inner side surface of the second connecting flange (2) is provided with a threaded ring body (5) adapted to the annular thread groove (4); A first connection plate (22) is arranged on a side of the outer ring of the first connection flange (1) close to the second connection flange (2), a second connection plate (23) is rotatably arranged on a side of the outer ring of the second connection flange (2) close to the first connection flange (1), and a sealing gasket structure (3) is arranged between the second connection plate (23) and the first connection plate (22); The first connection plate (22) is provided with a plurality of first through hole structures (6), and a connecting rod (7) is provided between every two of the first through hole structures (6). The second connection plate (23) is provided with a plurality of first threaded rods (8), and the second connection plate (23) is provided with a plurality of second through holes (9); the first threaded rod (8) passes through the sealing gasket structure (3) and the first through hole structure (6) and is fixedly connected by a nut (21), and the connecting rod (7) passes through the sealing gasket structure (3) and the second through hole (9) and is fixedly connected by a nut (21). The second connecting flange (2) and the second connecting plate (23) are fixedly connected by bolts (10); an internal threaded hole (18) is provided at one end of the connecting rod (7) away from the first connecting flange (1); the bolt (10) is screwed and connected to the internal threaded hole (18); the diameter of the end of the bolt (10) away from the internal threaded hole (18) is larger than the diameter of the second through hole (9); an annular groove (24) is provided on the outer surface of the second connecting flange (2) on the side close to the first connecting flange (1); and an annular block (25) is provided on the inner ring of the second connecting plate (23) for rotationally connecting to the annular groove (24).

2. A flange according to claim 1, characterized in that: The sealing gasket structure (3) comprises a first sealing gasket (11) and a second sealing gasket (12); the first sealing gasket (11) and the second sealing gasket (12) are fitted and adsorbed together; a side of the first sealing gasket (11) close to the second sealing gasket (12) is provided with a plurality of positioning grooves (13); each positioning groove (13) is provided with a first magnet (14); a side of the second sealing gasket (12) close to the first sealing gasket (11) is provided with a plurality of adsorption magnetic blocks (15) that are adsorbed to the first magnet (14).

3. A flange according to claim 2, characterized in that: The first sealing gasket (11) and the second sealing gasket (12) are each provided with a plurality of third through holes (16), a fourth through hole (17) is provided between every two of the third through holes (16), the first threaded rod (8) passes through the third through hole (16) and the first through hole structure (6), and the connecting rod (7) passes through the fourth through hole (17) and the second through hole (9).

4. A flange according to claim 3, characterized in that: The first through hole structure (6) comprises a circular through hole structure (19) and a hexagonal through hole structure (20), the circular through hole structure (19) is close to the second connecting flange (2), the nut (21) is clamped inside the hexagonal through hole structure (20), and the first threaded rod (8) passes through the circular through hole structure (19) and the hexagonal through hole structure (20) in sequence and is fixed by the nut (21).

5. A flange according to claim 4, characterized in that: A third internal threaded hole (26) is provided on the upper end surface of the hexagonal through hole structure (20), and the third internal threaded hole (26) penetrates to the surface of the first connecting plate (22); a fourth internal threaded hole (27) is provided on two corresponding sides of the nut (21), and the fourth internal threaded hole (27) is communicated with the third internal threaded hole (26) and is connected through a second bolt (28).

6. A flange according to claim 5, characterized in that: The outer ring surface of the second connecting plate (23) is also provided with a plurality of fifth threaded holes (29), and the fifth threaded holes (29) are internally screwed and connected with fifth threaded rods (30).

7. A flange according to claim 6, characterized in that: The first sealing gasket (11) and the second sealing gasket (12) are of the same size, and the inner diameters of the first sealing gasket (11) and the second sealing gasket (12) are the same as the diameters of the first connecting plate (22) and the second connecting plate (23).

8. A method for processing a flange as claimed in claim 7, characterized in that: The steps include: S1: First flange processing: an annular thread groove (4) is formed on the inner ring of the inner side surface of the first connecting flange (1) by using a slotting machine, and then a first connecting plate (22) is welded on the inner side of the outer ring of the first connecting flange (1), and then a plurality of first through hole structures (6) are formed on the inner side surface of the first connecting plate (22) by using a punching machine. When processing the first through hole structure (6), one side close to the second connecting flange (2) is processed into a circular through hole structure (19), and the other side is processed into a hexagonal through hole structure (20), and then a third internal threaded hole (26) is formed on the upper end surface of the hexagonal through hole structure (20), and a fourth internal threaded hole (27) is formed on the surface of the nut (21), and then a plurality of connecting rods (7) are welded on the inner side surface of the first connecting plate (22), and then an internal threaded hole (18) is formed on the end surface of each of the connecting rods (7); S2: Sealing gasket structure processing: two sealing gaskets are selected, and a third through hole (16) and a fourth through hole (17) corresponding to a plurality of positions are opened on the first sealing gasket (11) and the second sealing gasket (12), and then a positioning groove (13) is opened on the inner side of the first sealing gasket (11) and a first magnet (14) is embedded inside, and an adsorption magnetic block (15) corresponding to the position of the first magnet (14) is welded on the inner side of the second sealing gasket (12); S3: Processing of the second flange: an annular groove (24) is formed on the surface of the second connecting flange (2) close to the first connecting flange (1), and then a second connecting plate (23) is clamped on the surface of the second connecting flange (2), a plurality of first threaded rods (8) are welded on the inner side surface of the second connecting plate (23), a threaded ring body (5) is welded on the inner side surface of the second connecting flange (2), a fifth threaded hole (29) is formed on the surface of the second connecting plate (23), and a fifth threaded rod (30) is screwed and connected into the fifth threaded hole (29).

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