High-sealing butt welding flange and machining method and machining equipment thereof

Abstract

The invention discloses a high-sealing butt welding flange, which belongs to the technical field of flange processing, and comprises a first flange plate and a second flange plate, the first flange plate is concavely provided with a first sealing surface with a spherical structure, and the second flange plate is convexly provided with a second sealing surface with a spherical structure; a first butt welding part is arranged on the end face, opposite to the first sealing face, of the first flange plate in a protruding mode, a second butt welding part is arranged on the end face, opposite to the second sealing face, of the second flange plate in a protruding mode, and a sealing gasket is arranged between the first sealing face and the second sealing face in a clamped mode. The thickness of the sealing gasket is gradually reduced in the direction extending from the outer edge to the center, and when the first flange plate and the second flange plate are installed in place, the second surface is tightly attached to the second sealing face. According to the high-sealing butt welding flange, the sealing area is large, the deformation amount of the sealing gasket tends to be consistent, and the sealing uniformity is good. The invention further discloses a machining method and machining equipment suitable for the butt welding flange.

Description

Technical Field

[0001] This invention relates to the field of flange processing technology, and in particular, to a high-sealing butt-welding flange, processing method, and processing equipment. Background Technology

[0002] A weld neck flange is a pipe fitting with a neck and a circular tube transition structure. It is connected to the pipeline by welding and is mainly used in high-pressure, high-temperature, or media-sensitive piping systems. The flared transition neck structure on the weld neck flange keeps the weld joint away from the sealing surface, which reduces welding deformation and improves sealing performance. Applicable pressure ratings range from PN2.5MPa to PN400 and higher standards.

[0003] The sealing surface between weld neck flanges is a key component to ensure a tight and leak-free connection between pipes and equipment. Flange sealing surfaces come in various types, including raised face (RF), flat face (FF), concave face (MF), and raised face (M), etc. Without exception, all of these sealing surfaces are planar structures perpendicular to the flange axis. Due to the limited sealing surface area of ​​planar structures, even with a gasket placed between the two sealing surfaces during actual installation, the sealing performance is difficult to meet the harsh conditions of certain high-pressure applications. Therefore, it is necessary for the inventors to improve the structure of weld neck flanges to increase the sealing surface area and thus improve the sealing performance. Summary of the Invention

[0004] Therefore, it is necessary to provide a welding flange with good sealing performance;

[0005] It is also necessary to provide a machining method for processing this weld neck flange;

[0006] It is even more necessary to provide a processing equipment for processing this weld neck flange.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a high-sealing weld neck flange, including a first flange and a second flange. The first flange has a first sealing surface with a spherical structure recessed on it, and the second flange has a second sealing surface with a spherical structure protruding on it. A first weld neck portion is protruding on the end face of the first flange opposite to the first sealing surface, and a second weld neck portion is protruding on the end face of the second flange opposite to the second sealing surface. A sealing gasket is sandwiched between the first sealing surface and the second sealing surface. The sealing gasket has a first surface that fits against the first sealing surface and a second surface that is opposite to the first surface. When the sealing gasket is not squeezed by the first sealing surface and the second sealing surface, the thickness of the sealing gasket gradually decreases in the direction extending from the outer edge to the center. When the first flange and the second flange are installed in place, the second surface fits tightly against the second sealing surface.

[0008] Furthermore, when the first flange and the second flange are not installed in place, the center Y2 of the second sealing surface is located on the side of the center Y1 of the first sealing surface away from the first sealing surface. When the second flange moves along the central axis z to be installed in place with the first flange, the center Y2 coincides with the center Y1.

[0009] Furthermore, a first end plane is formed on the outer side of the first sealing surface on the first flange, and a second end plane is formed on the outer side of the second sealing surface on the second flange. The outer edge of the gasket extends outward in the horizontal direction to form an extension portion. The extension portion is sandwiched between the first end plane and the second end plane. The thickness of the extension portion is the same at all points. When the first flange and the second flange are not installed in place, the thickness of the extension portion is less than the thickness of the gasket at the center.

[0010] Furthermore, a protrusion is provided on the first end plane, and a groove is recessed on the second end plane. The protrusion can be inserted into the groove along the axial direction of the first flange. When the first flange and the second flange are installed in place, the free end of the protrusion abuts against the bottom wall of the groove.

[0011] Furthermore, a through groove is provided on the extension, and the protrusion engages with the through groove and penetrates the through groove.

[0012] Furthermore, the first flange has a first mounting hole with a through protrusion, and the second flange has a second mounting hole with a through groove. Locking bolts pass through the first and second mounting holes, and locking nuts are installed on the locking bolts.

[0013] A flange processing method, applicable to the high-sealing weld neck flange described in any of the preceding claims, the processing method comprising:

[0014] Step S10: Blanking, stamping the metal sheet into a circular blank with a through hole in the middle;

[0015] Step S20: Heat treatment, the billet is placed in a heating furnace and heated to a temperature of 1100℃-1200℃;

[0016] Step S30: Stamping. The heat-treated blank is placed into the stamping die and stamped by the first moving die to form the first weld joint and the second weld joint. Then the blank is inverted and placed back into the stamping die. The blank is stamped by the second moving die to form the first sealing surface. The blank is stamped by the third moving die to form the second sealing surface.

[0017] Step S40: Trim the edges, using a grinding device to shape the edges to the required size;

[0018] Step S50: Beveling and grinding. The ports of the first and second weld joints are beveled and the bevels are ground flat.

[0019] A flange processing device, applicable to high-sealing weld neck flanges as described in any of the preceding claims, characterized in that: it includes a base and a rotating disc, a stamping die is fixedly installed on the base, the rotating disc is located above the base, and a first stamping die, a second stamping die, and a third stamping die are installed on the lower surface of the rotating disc. By moving the rotating disc, any one of the first stamping die, the second stamping die, and the third stamping die can be aligned with the stamping die.

[0020] Furthermore, a circular cavity for placing the blank is formed on the upper surface of the stamping die, and a positioning groove is formed at the center of the bottom of the cavity. The positioning groove mates with both the first and second welding parts. The bottom of the first stamping die has a convex punch that can form the first and second welding parts after stamping. The bottom of the second stamping die is a convex spherical structure, and the bottom of the third stamping die is a concave spherical structure.

[0021] Furthermore, the rotating disk has a circular structure, and the first, second, and third stamping moving dies are arranged circumferentially at the edge of the rotating disk. The rotating disk rotates around its own central axis, or the rotating disk moves horizontally, and the first, second, and third stamping moving dies are installed in a straight line on the rotating disk.

[0022] The beneficial effects of this invention are as follows: In the high-sealing weld neck flange of this invention, when the gasket is not compressed by the first and second sealing surfaces, the thickness of the gasket gradually decreases from the outer edge towards the center. During installation, the thickness at the outer edge of the gasket is compressed to a smaller extent, while the thickness near the center of the gasket is compressed to a larger extent. Since the center of the gasket does not initially contact the second sealing surface, a certain gap exists between them. This gap alleviates the degree of compression on the center of the gasket, thus preventing excessive compression on the center compared to the edges when the second flange moves. On the one hand, this makes the amount of compression on the gasket from the outer edge to the center more uniform, resulting in good sealing uniformity and high sealing reliability. On the other hand, it also avoids excessive compression near the center of the gasket, which could lead to sealing failure. This invention also provides a flange processing method and processing equipment suitable for this weld neck flange. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the high-sealing weld neck flange of the present invention (in the assembled state).

[0025] Figure 2 yes Figure 1 The diagram shows another state of the high-sealing weld neck flange (not assembled in place).

[0026] Figure 3 yes Figure 1 The diagram shows the area swept by the second sealing surface of the high-sealing weld neck flange after it moves downward a distance L.

[0027] Figure 4 This is a flowchart of the flange processing method of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection structure between the base and the stamping die in the flange processing equipment of the present invention;

[0029] Figure 6 This is a schematic diagram of the connection structure between the rotating disc and the first, second, and third stamping moving dies in the flange processing equipment of the present invention.

[0030] In the figure: 10, First flange; 101, First sealing surface; 102, First butt weld; 103, First channel; 104, Protrusion; 105, First end face; 106, First mounting hole; 20, Second flange; 201, Second sealing surface; 202, Second butt weld; 203, Second channel; 204, Groove; 205, Second end face; 206, Second mounting hole; 30, Sealing gasket; 301, First surface; 302, Second surface; 303, Through hole; 31, Extension; 311, Through groove; 40, Locking bolt; 50, Locking nut; 60, Stamping die; 601, Die cavity; 602, Positioning groove; 70, First stamping moving die; 80, Second stamping moving die; 90, Third stamping moving die; 100, Base; 200, Rotating disc. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0032] Please see Figures 1-3This invention provides a high-sealing weld neck flange, comprising a first flange 10 and a second flange 20, which are fixedly connected by butt joint. Specifically, the first flange 10 is provided with a first sealing surface 101, and a first weld neck portion 102 is protruding from the end face of the first flange 10 opposite to the first sealing surface 101. The second flange 20 is provided with a second sealing surface 201, and a second weld neck portion 202 is protruding from the end face of the second flange 20 opposite to the second sealing surface 201. A sealing gasket 30 is sandwiched between the first sealing surface 101 and the second sealing surface 201. Both the first weld neck portion 102 and the second weld neck portion 202 are used for welding and fixing to a pipeline.

[0033] The first flange 10 has a disc-shaped structure, and the first sealing surface 101 is a spherical structure recessed at the center of the first flange 10. The second flange 20 has a disc-shaped structure, and the second sealing surface 201 is a spherical structure protruding at the center of the second flange 20. When the first flange 10 and the second flange 20 are connected in place, the center of the first sealing surface 101 (marked as Y1 in the attached drawing) and the center of the second sealing surface 201 (marked as Y2 in the attached drawing) coincide (see...). Figure 1 At this point, the gasket 30 is tightly pressed between the first sealing surface 101 and the second sealing surface 201, and both end faces of the gasket 30 are tightly fitted with the two sealing surfaces. Specifically, the gasket 30 has a first surface 301 and a second surface 302 disposed opposite to each other, and the first surface 301 is a spherical structure that mates with the first sealing surface 101. During installation, the gasket 30 is first placed on the first flange 10, and the first surface 301 is fitted with the first sealing surface 101. Then, the second flange 20 is installed, thereby pressing the gasket 30 between the first flange 10 and the second flange 20. After installation, the second surface 302 of the gasket 30 is tightly fitted with the second sealing surface 201 to seal the two sealing surfaces.

[0034] Compared to traditional flange sealing surfaces, this invention sets the sealing surface as a spherical structure, which increases the sealing area between flanges, makes the contact surface more uniform, and can better withstand high pressure and vibration, resulting in better leak prevention.

[0035] During the specific installation process, when the first flange 10 and the second flange 20 are not in place, the center Y2 of the second sealing surface 201 is located on the side away from the center Y1 of the first sealing surface 101 (see...). Figure 2 As the second flange 20 gradually approaches the first flange 10 along the axial direction, the center Y2 gradually approaches the center Y1, and finally, when it is installed in place, the center Y2 coincides with the center Y1.

[0036] The first flange 10 has a first channel 103 axially formed, with both ends of the first channel 103 penetrating the first sealing surface 101 and the first weld joint 102, respectively. The second flange 20 has a second channel 203 axially formed, with both ends of the second channel 203 penetrating the second sealing surface 201 and the second weld joint 202, respectively. Correspondingly, the sealing gasket 30 has a through hole 303 at its center, which is aligned and connected to both the first channel 103 and the second channel 203.

[0037] Please see Figure 2 When the sealing gasket 30 is not compressed by the first sealing surface 101 and the second sealing surface 201, the thickness of the sealing gasket 30 gradually decreases from the outer edge towards the center. Here, the thickness of the outer edge of the sealing gasket 30 is marked as H1, and the thickness of the center of the sealing gasket 30 is marked as H2. Obviously, H1 > H2. To clearly illustrate the technical solution of the present invention, it is specified here that the central axis of the second flange 20 is marked as z. During installation, the first flange 10 and the second flange 20 are coaxially aligned, and the second flange 20 gradually approaches the first flange 10 along the z-axis. Figure 3 In the middle, the position of the second sealing surface 201 relative to the first sealing surface 101 is position A, which is the direction of the second flange 20 along the z-axis towards the first flange 10 (i.e., Figure 3 When the second sealing surface 201 moves a distance L along the v-direction, its position relative to the first sealing surface 101 is position B (the dotted line at position B represents the position of the second sealing surface 201 after the movement). The area swept by the second sealing surface 201 when moving between positions A and B is denoted as s. Within region s, the width W1 is narrower closer to the edge and wider closer to the center, i.e., W2 > W1. In other words, when the second sealing surface 201 moves a unit distance closer to the first sealing surface 101, the middle portion of the sealing gasket 30 between the first sealing surface 101 and the second sealing element 201 is compressed more severely than the edge portion. This means that the middle portion of the sealing gasket 30 is more susceptible to excessive compression, leading to seal failure.

[0038] Based on the foregoing, the thickness of the sealing gasket 30 of the present invention gradually decreases from the outer edge to the center. Therefore, as the second flange 20 gradually approaches the first flange 10 along the z-axis, the second sealing surface 201 first contacts the outer edge of the sealing gasket 30. At this time, the portion of the sealing gasket 30 near the center has not yet contacted the second sealing surface 201. As the second flange 20 continues to move, the thickness at the outer edge of the sealing gasket 30 is compressed to a smaller extent, while the thickness near the center of the sealing gasket 30 is compressed to a larger extent. Since the center of the sealing gasket 30 does not initially contact the second sealing surface 201, there is a certain gap between them. This gap can alleviate the degree of compression on the center of the sealing gasket 30, thereby preventing the center of the sealing gasket 30 from being excessively compressed compared to the edge portion when the second flange 20 moves. On the one hand, this makes the amount of compression on the sealing gasket 30 from the outer edge to the center more uniform, resulting in good sealing uniformity and strong sealing reliability. On the other hand, it also avoids the situation where the sealing gasket 30 is excessively compressed near the center, leading to sealing failure.

[0039] The sealing gasket 30 is a one-piece molded structure and is made of silicone or rubber.

[0040] On the two mating surfaces of the first flange 10 and the second flange 20, respectively, are fitted protrusions 104 and grooves 204. The protrusions 104 can be inserted into the grooves 204 along the axial direction of the first flange 10. During installation, as the second flange 20 moves along the z-axis and mates with the first flange 10, the protrusions 104 gradually insert into the grooves 204. When fully installed, the free end of the protrusion 104 abuts against the bottom wall of the groove 204, at which point the center Y2 coincides with the center Y1. The mating relationship between the protrusions 104 and the grooves 204 effectively positions the first flange 10 and the second flange 20 for quick and easy mating. Furthermore, when the protrusions 104 abut against the bottom wall of the groove 204, the two flanges cannot be further pressed together, thus preventing excessive compression of the gasket 30, preventing gasket 30 failure, and ensuring sealing performance.

[0041] In a preferred embodiment, a first end plane 105 is formed on the outer side of the first sealing surface 101 on the first flange 10, and a second end plane 205 is formed on the outer side of the second sealing surface 201 on the second flange 20. Both the first end plane 105 and the second end plane 205 are annular structures and are parallel to each other. A protrusion 104 protrudes from the first end plane 105, and a groove 204 is recessed into the second end plane 205. The protrusion 104 is a cylinder arranged along the axial direction of the first flange 10, and the groove 204 is a circular blind groove that mates with the cylinder. In addition, there are multiple protrusions 104 and grooves 204, and one protrusion 104 mates with one groove 204. Furthermore, the multiple protrusions 104 are evenly distributed along the axial direction of the first flange 10 to ensure balanced force distribution. To facilitate the mating of the protrusion 104 and the groove 204, the free end of the protrusion 104 (i.e., the end of the protrusion 104 away from the first flange 10) and the open end of the groove 204 are both chamfered.

[0042] Please refer to it again. Figure 2 The outer edge of the sealing gasket 30 extends outward in a horizontal direction to form an extension 31. The extension 31 has a circular structure and is sandwiched between the first end plane 105 and the second end plane 205. The thickness of the extension 31 is the same at all positions. When the first flange 10 and the second flange 20 are not installed in place, the thickness of the extension 31 is less than the minimum thickness of the sealing gasket 30. That is, the thickness of the extension 31 is less than the thickness of the sealing gasket 30 at the center. Here, the thickness of the extension 31 is marked as H3, then H2 > H3. The purpose of this is that when the second flange 20 moves along the z-axis to the first flange 10, the second end plane 205 moves the same distance closer to the first end plane 105. At this time, the extension 31 located between the two is squeezed the most. Therefore, the present invention sets the thickness of the extension 31 to be less than the thickness of the sealing gasket 30 at the center. In the initial stage of the installation process, the second end plane 205 will not squeeze the extension 31 first. Instead, the extension 31 will be squeezed after the center of the sealing gasket 30 is squeezed, so that the two surfaces of the extension 31 are respectively in contact with the first end plane 105 and the second end plane 205, effectively avoiding the situation where the extension 31 is squeezed too much and the seal fails.

[0043] Furthermore, a through groove 311 is provided on the extension 31, and the protrusion 104 engages with and penetrates the through groove 311. During installation, the gasket 30 is first installed on the first flange 10, so that the protrusion 104 penetrates the through groove 311. At this time, the position of the gasket 30 relative to the first flange 10 is determined. Through the engagement between the protrusion 104 and the through groove 311, the efficiency of the user's installation of the gasket 30 is greatly facilitated, which is beneficial to the user's installation operation and avoids misalignment of the gasket 30.

[0044] The high-sealing weld neck flange of the present invention further includes a locking bolt 40 and a locking nut 50. The locking bolt 40 passes through the first flange 10 and the second flange 20 in sequence and is then locked and fixed by the locking bolt 50. Specifically, the first flange 10 has a first mounting hole 106, and the second flange 20 has a second mounting hole 206. The tail of the locking bolt 40 passes through the first mounting hole 106 and the second mounting hole 206 in sequence, and the locking nut 50 is installed at the tail of the locking bolt 40. As a preferred embodiment, the first mounting hole 206 passes through the protrusion 104, and the second mounting hole 206 passes through the groove 204, so that the locking bolt 40 is installed correspondingly at the position of the protrusion 104, making the structure more compact and avoiding the trouble of opening other holes in the extension 31 besides the through groove 311, making the design more reasonable.

[0045] Please see Figure 4 The present invention also provides a flange processing method applicable to the above-mentioned high-sealing weld neck flange, the flange processing method comprising:

[0046] Step S10: Blanking. Prepare a metal sheet, place it on a stamping machine, and form a ring-shaped blank with a through hole in the middle under the stamping action of the stamping machine;

[0047] Step S20: Heat treatment. The billet is placed in a heating furnace and heated to 1100℃-1200℃ to reduce the internal stress generated inside the billet during stamping, so that it has good plasticity to facilitate subsequent processing;

[0048] Step S30: Stamping. The heat-treated blank is placed into the stamping die 60. The blank is stamped once using the same first moving die 70 to form the first weld joint 102 and the second weld joint 202. The stamped blank is then inverted and placed back into the stamping die 60. The blank is stamped again using the second moving die 80 to form the first sealing surface 101. The blank is then stamped again using the third moving die 90 to form the second sealing surface 201. The first flange 10 and the second flange 20 are thus initially formed. After stamping, the initially formed flange can be clamped on a drilling machine to machine the mounting holes for the locking bolts 40.

[0049] Step S40: Trimming. The first flange 10 and the second flange 20, which are initially formed by molding, have burrs (i.e., excess metal residue at the edges) at the edges. The edges are trimmed to the required dimensions using a grinding machine.

[0050] Step S50: Beveling and grinding. The ports of the first weld joint 102 and the second weld joint 202 on the initially formed first flange 10 and second flange 20 are beveled and ground to make the bevel smooth, which facilitates subsequent welding with the pipeline.

[0051] Please see Figure 5 , Figure 6 The present invention also provides a flange processing device suitable for the aforementioned high-sealing weld neck flange, comprising a base 100 and a rotating disc 200. The base 100 is fixedly mounted on a bearing surface (e.g., a factory floor), and the rotating disc 200 is disposed above the base 100. In this embodiment, the rotating disc 200 has a disc structure with its central axis vertically arranged. Under the action of a driving mechanism (e.g., a drive motor), the rotating disc 200 can rotate relative to the base 100 around its central axis. A stamping fixed die 60 is fixedly mounted on the base 100. A first stamping moving die 70, a second stamping moving die 80, and a third stamping moving die 90 are circumferentially mounted at the edge of the lower surface of the rotating disc 200. By rotating the rotating disc 200, any one of the first stamping moving die 70, the second stamping moving die 80, and the third stamping moving die 90 can be aligned with the stamping fixed die 60. In addition, the first stamping moving die 70, the second stamping moving die 80 and the third stamping moving die 90 are all mounted on the changing plate 200 by separate cylinders.

[0052] A circular cavity 601 is formed on the upper surface of the stamping die 60, and a positioning groove 602 is formed at the center of the bottom of the cavity 60. The cavity 601 mates with the annular blank, and the positioning groove 602 mates with both the first weld part 102 and the second weld part 202. The bottom of the first stamping die 70 has a convex punch. In use, the annular blank is placed in the cavity 601, and the first stamping die 70 is rotated to align with the stamping die 60 by rotating the rotating disc 200. At this time, the corresponding cylinder is activated to make the first stamping die 70 stamp the blank, and finally the first weld part 102 and the second weld part 202 are formed on the upper surface of the blank.

[0053] After the first weld joint 102 and the second weld joint 202 are processed, the user inverts the blank so that the first weld joint 102 and the second weld joint 202 are inserted into the positioning groove 602 in a corresponding fit. Then, the first sealing surface 101 and the second sealing surface 201 are processed. Specifically, the bottom of the second stamping moving die 80 is a convex spherical structure, and the bottom of the third stamping moving die 90 is a concave spherical structure. When the inverted blank (with the first weld joint 102 and the second weld joint 202 inserted into the positioning groove 602) is placed into the stamping fixed die 60, the user can rotate the rotating disk 200 to rotate the corresponding second stamping moving die 80 or third stamping moving die 90 above the stamping fixed die 60, and obtain the first sealing surface 101 or the second sealing surface 201 by stamping. The flange processing equipment of the present invention can be used for the installation of the first flange 10 and the second flange 20 with the same stamping fixed die 60. At the same time, the three stamping moving dies can be rotated above the stamping fixed die 60 by the rotation of the rotating disc 200 to process the blank accordingly. The operation is simple and convenient, and the processing efficiency is greatly improved.

[0054] In other embodiments not shown, the changing disk 200 can also move horizontally under the action of a drive mechanism (e.g., a hydraulic cylinder). The first moving die 70, the second moving die 80, and the third moving die 90 are mounted in a straight line on the changing disk 200. In use, the hydraulic cylinder drives the changing disk 200 to move horizontally, thereby moving the three moving dies on it, so that any one of the moving dies can be aligned with the fixed die 60 below. The specific shape and movement of the changing disk 200 are not limited here, as long as the moving changing disk 200 allows any one of its moving dies to be aligned with the fixed die 60.

[0055] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-sealing butt-welding flange, characterized in that: The flange includes a first flange (10) and a second flange (20). The first flange (10) has a first sealing surface (101) with a spherical structure recessed on it, and the second flange (20) has a second sealing surface (201) with a spherical structure protruding on it. A first welding part (102) protrudes from the end face of the first flange (10) opposite to the first sealing surface (101), and a second welding part (202) protrudes from the end face of the second flange (201) opposite to the second sealing surface (201). The first sealing surface (201) and the second sealing surface (202) A sealing gasket (30) is sandwiched between the first sealing surface (101) and the second sealing surface (201). The sealing gasket (30) has a first surface (301) that fits against the first sealing surface (101) and a second surface (302) that is opposite to the first surface (301). When the sealing gasket (30) is not squeezed by the first sealing surface (101) and the second sealing surface (201), the thickness of the sealing gasket (30) gradually decreases from the outer edge to the center. When the first flange (10) and the second flange (20) are installed in place, the second surface (302) fits tightly against the second sealing surface (202).

2. The high-sealing weld neck flange as described in claim 1, characterized in that: When the first flange (10) and the second flange (20) are not installed in place, the center Y2 of the second sealing surface (201) is located on the side away from the center Y1 of the first sealing surface (101). When the second flange (20) moves along the central axis z to be installed in place with the first flange (10), the center Y2 coincides with the center Y1.

3. The high-sealing weld neck flange as described in claim 1 or 2, characterized in that: The first flange (10) has a first end plane (105) formed on the outside of the first sealing surface (101), and the second flange (20) has a second end plane (205) formed on the outside of the second sealing surface (201). The outer edge of the sealing gasket (3) extends outward in the horizontal direction to form an extension (31). The extension (31) is sandwiched between the first end plane (105) and the second end plane (205). The extension (31) has the same thickness at all points. When the first flange (10) and the second flange (20) are not installed in place, the thickness of the extension (31) is less than the thickness of the sealing gasket (30) at the center.

4. The high-sealing weld neck flange as described in claim 3, characterized in that: The first end plane (105) is provided with a protrusion (104), and the second end plane (205) is provided with a groove (204). The protrusion (104) can be inserted into the groove (204) along the axial direction of the first flange (10). When the first flange (10) and the second flange (20) are installed in place, the free end of the protrusion (104) abuts against the bottom wall of the groove (204).

5. The high-sealing welding flange as described in claim 4, characterized in that: The extension (31) has a through groove (311), and the protrusion (104) engages with the through groove (311) and penetrates the through groove (311).

6. The high-sealing weld neck flange as described in claim 4, characterized in that: The first flange (10) has a first mounting hole (206) with a through protrusion (104), and the second flange (20) has a second mounting hole (206) with a through groove (204). Locking bolts (40) pass through the first mounting hole (106) and the second mounting hole (206), and locking nuts (50) are installed on the locking bolts (40).

7. A flange processing method applicable to the high-sealing weld neck flange according to any one of claims 1-6, the processing method comprising: Step S10: Blanking, stamping the metal sheet into a circular blank with a through hole in the middle; Step S20: Heat treatment, the billet is placed in a heating furnace and heated to a temperature of 1100℃-1200℃; Step S30: Stamping. The heat-treated blank is placed into the stamping die (60), and the blank is stamped by the first stamping die (70) to form the first weld part (102) and the second weld part (202). Then the blank is inverted and placed back into the stamping die (60), and the blank is stamped by the second stamping die (80) to form the first sealing surface (101). The blank is stamped by the third stamping die (90) to form the second sealing surface (201). Step S40: Trim the edges, using a grinding device to shape the edges to the required size; Step S50: Beveling and grinding, beveling the ports of the first weld joint (102) and the second weld joint (202) and grinding the bevel flat.

8. A flange processing equipment, applicable to the high-sealing weld neck flange as described in any one of claims 1-6, characterized in that: The device includes a base (100) and a rotating disk (200). A stamping die (60) is fixedly installed on the base (100). The rotating disk (200) is located above the base (100). A first stamping die (70), a second stamping die (80), and a third stamping die (90) are installed on the lower surface of the rotating disk (200). By moving the rotating disk (200), any one of the first stamping die (70), the second stamping die (80), and the third stamping die (90) can be aligned with the stamping die (60).

9. The flange processing equipment as described in claim 8, characterized in that: The upper surface of the stamping die is provided with a circular cavity (601) for placing the blank. A positioning groove (602) is provided at the bottom center of the cavity (601). The positioning groove (602) is in cooperation with the first welding part (102) and the second welding part (202). The bottom of the first stamping die (70) has a convex punch that can form the first welding part (102) and the second welding part (202) after stamping. The bottom of the second stamping die (80) is a convex spherical structure. The bottom of the third stamping die (90) is a concave spherical structure.

10. The flange processing equipment as described in claim 8, characterized in that: The rotating disk (200) has a circular structure. The first stamping moving die (70), the second stamping moving die (80), and the third stamping moving die (90) are arranged circumferentially at the edge of the rotating disk (200). The rotating disk (200) rotates around its own central axis, or the rotating disk (200) moves horizontally. The first stamping moving die (70), the second stamping moving die (80), and the third stamping moving die (90) are installed in a straight line on the rotating disk (200).

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