Processing method for sealing surface of all-metal forged alloy steel butterfly valve

Abstract

The application discloses a full-metal forged alloy steel butterfly valve sealing surface processing method, which comprises a processing base and a mounting frame. The top of the processing base is provided with a sealing clamping mechanism and a positioning assembly. The top of a supporting table is provided with a fixed sleeve. The top of the fixed sleeve is provided with a movable sleeve. A clamping groove is formed in one side of the inner wall of each of the two recesses. L-shaped clamping blocks are fixedly arranged on the two sides of the bottom of the two movable sleeves. A through groove is formed in the two sides of the fixed sleeve and the two sides of the movable sleeve. A first extrusion ring is arranged on the outer wall of the movable sleeve. A second extrusion ring is arranged on the outer wall of the fixed sleeve. The positioning ring corresponding in size is clamped into the mounting groove on the top of the second extrusion ring, the movable sleeve is pulled out from the top of the fixed sleeve, the metal butterfly valve sealing ring is stacked outside the positioning ring, the movable sleeve is installed, the first electric push rod is started to lift, and the butterfly valve sealing ring is moved to the welding area in the extrusion and lifting process of the first extrusion ring and the second extrusion ring.

Description

Technical Field

[0001] This invention relates to the technical field of machining the sealing surface of an all-metal butterfly valve, specifically a method for machining the sealing surface of an all-metal forged alloy steel butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is characterized by a disc-shaped closing element (valve disc or butterfly plate) that rotates around a valve shaft to open and close. It can control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. Primarily used for shut-off and throttling in pipelines, the various outer components of a butterfly valve are essentially annular. Ensuring a tight seal is crucial when these components are joined; therefore, the machining method of the sealing surfaces plays a vital role in the manufacturing process of butterfly valves.

[0003] The sealing surfaces of most butterfly valves currently in use are forged from all-metal alloy steel, which is a hard-on-hard metal-to-metal seal without any other non-metallic layers. The sealing surfaces are made using overlay welding or spray welding techniques. The advantages of this design are erosion resistance, wear resistance, high temperature and high pressure resistance, long service life, and it solves the various requirements of different media for sealing surface materials.

[0004] However, in the process of sealing and welding the sealing surface of a butterfly valve, the common processing method is to stack the overlapping metal sealing rings together, and then the workers manually weld the overlapping and mating areas with a welding gun. This method not only requires the workers to pay close attention to whether the mating area is tight and aligned, but also requires manual squeezing and fixing to prevent loosening during welding, which would cause the mating surface to shift or fall off, increasing the workload and reducing the processing efficiency of the butterfly valve. In addition, manual spray welding may also cause uneven welding areas. In view of this, this design proposes a processing method for the sealing surface of an all-metal forged alloy steel butterfly valve. Summary of the Invention

[0005] The purpose of this invention is to provide a method for machining the sealing surface of an all-metal forged alloy steel butterfly valve, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention proposes a method for machining the sealing surface of an all-metal forged alloy steel butterfly valve, including a machining base and a mounting bracket. The top of the machining base is equipped with a sealing clamping mechanism and a positioning component, and the bottom of the mounting bracket is equipped with a rotating mechanism and a spray welding mechanism. The mounting bracket is installed at the edge of the top side of the machining base.

[0007] The sealing clamping mechanism includes a support platform fixedly installed at the top center of the processing base. A fixed sleeve is installed on the top of the support platform, and a movable sleeve is installed on the top of the fixed sleeve. Grooves are formed on both sides of the top of the fixed sleeve, and slots are formed on one side of the inner wall of each of the two grooves. L-shaped blocks are fixedly provided on both sides of the bottom of each of the two movable sleeves. Through slots are formed on both sides of the fixed sleeve and both sides of the movable sleeve. A connecting cylinder is fixedly provided on the top of the inner wall of the movable sleeve. A connecting shaft is inserted through the inner wall of the connecting cylinder. A first connecting frame is fixedly provided on the bottom of the connecting shaft. A spring is fitted on the outer wall of the connecting shaft, and the two ends of the spring are fixedly connected to the bottom of the connecting cylinder and the top of the first connecting frame, respectively. A first compression ring is fitted on the outer wall of the movable sleeve, and a second compression ring is fitted on the outer wall of the fixed sleeve. A first electric push rod is installed on the inner wall of the support platform.

[0008] The positioning component includes a second connecting frame fixedly installed at the output end of the first electric push rod. The top of the second compression ring is provided with multiple annular mounting slots at equal intervals, and a positioning ring is inserted into the inner wall of one of the annular mounting slots.

[0009] In one example, the two ends of the first connecting frame pass through the inner walls of the through slots on both sides of the movable sleeve and are fixedly connected to the two sides of the inner wall of the first extrusion ring, and the two ends of the second connecting frame pass through the inner walls of the through slots on both sides of the fixed sleeve and are fixedly connected to the two sides of the inner wall of the second extrusion ring.

[0010] In one example, the outer walls of the two L-shaped blocks pass through the inner walls of the two grooves and are connected to the inner walls of the two slots, and when the two L-shaped blocks completely fill the inner walls of the two slots, the inner walls of the four through slots are connected to each other.

[0011] In one example, the rotating mechanism includes a fixed frame mounted below the top of the mounting bracket, with an annular connecting groove at the edge of the top of the fixed frame, and limit grooves on both sides of the inner wall of the annular connecting groove.

[0012] In one example, a rotating ring is rotatably connected to the inner wall of the annular connecting groove. Limiting rings are fixedly provided at the middle positions of the inner and outer sides of the rotating ring, and the outer walls of the two limiting rings are rotatably connected to the inner walls of the two limiting grooves respectively. A toothed ring is fixedly provided at the top of the rotating ring, and a gear meshes with the outer wall of the toothed ring.

[0013] In one example, the spray welding mechanism includes an L-shaped bracket installed at the bottom of the rotating ring. A limiting groove is formed at the bottom of the L-shaped bracket, and a slider is slidably connected to the inner wall of the limiting groove. A spray welding gun is fixedly installed at the bottom of the slider.

[0014] In one example, a second electric push rod is installed on one side of the outer wall of the L-shaped bracket, and the output end of the second electric push rod passes through the inner wall of the limiting slide groove and is fixedly connected to one side of the slider. A motor is installed at the corner below the top of the mounting bracket, and the output end of the motor is fixedly connected to one end of the gear.

[0015] In one example, a control panel is fixedly provided on one side of the outer wall of the processing base, and the first electric push rod, the welding gun, the second electric push rod, and the motor are all electrically connected to an external power supply through the control panel.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up a sealing clamping mechanism and a fixed component, during the processing of the butterfly valve sealing surface, a positioning ring of the corresponding size is inserted into the mounting groove on the top of the second extrusion ring, and the movable sleeve is pulled out from the top of the fixed sleeve. The metal butterfly valve sealing ring is then stacked on the outside of the positioning ring, the movable sleeve is installed, and the first electric push rod is activated to lift it. During the extrusion and rise of the first and second extrusion rings, the butterfly valve sealing ring moves to the welding area. This design eliminates the need for manual pressure to maintain a tight contact between the sealing surfaces. At the same time, the positioning component ensures precise alignment and automatic movement to the welding area, reducing the risk of sealing surface misalignment caused by human vibration. This improves the processing efficiency and quality of the butterfly valve while reducing the workload of the operators.

[0018] 2. By setting up a rotating mechanism, when welding the sealing surface of the butterfly valve, the rotating mechanism carries the spray welding mechanism to rotate and weld at a uniform speed around the sealing area of ​​the butterfly valve, eliminating the need for workers to manually operate the welding gun to move and weld, thus improving the processing uniformity of the butterfly valve sealing surface.

[0019] 3. During the spray welding process, the second electric push rod pushes the slider to slide in the limiting groove, thereby moving the spray welding gun closer to the mating area of ​​the butterfly valve sealing surface for welding. After the welding is completed, the second electric push rod pulls the spray welding gun away from the butterfly valve sealing ring, so that the butterfly valve is not easily blocked by the spray welding gun when disassembling, which facilitates the disassembly and assembly of the butterfly valve and improves the convenience of using the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the sealing clamping mechanism of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the fixed sleeve and the movable sleeve of the present invention;

[0023] Figure 4 Appendix to the specification of this invention Figure 3 Enlarged structural diagram at point A;

[0024] Figure 5 This is a schematic diagram of the positioning component of the present invention;

[0025] Figure 6 This is a structural schematic diagram of the front of the processing base of the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of the fixing frame of the present invention;

[0027] Figure 8 This is a schematic diagram of the rotating mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram of the spray welding mechanism of the present invention.

[0029] In the diagram: 1. Machining base; 2. Mounting bracket; 3. Sealing clamping mechanism; 301. Support platform; 302. Fixed sleeve; 303. Movable sleeve; 304. Groove; 305. Slot; 306. L-shaped locking block; 307. Through groove; 308. Connecting cylinder; 309. Connecting shaft; 310. First connecting bracket; 311. Spring; 312. First compression ring; 313. Second compression ring; 314. First electric push rod; 4. Positioning assembly; 401, second connecting frame; 402, annular mounting groove; 403, positioning ring; 5, rotating mechanism; 501, fixed frame; 502, connecting groove; 503, limiting groove; 504, rotating ring; 505, limiting ring; 506, gear ring; 507, gear; 6, spray welding mechanism; 601, L-shaped bracket; 602, limiting slide groove; 603, slider; 604, spray welding gun; 7, second electric push rod; 8, motor. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-9This invention provides a technical solution: a method for machining the sealing surface of an all-metal forged alloy steel butterfly valve, including a machining base 1 and a mounting bracket 2. A sealing clamping mechanism 3 and a positioning component 4 are mounted on the top of the machining base 1. A rotating mechanism 5 and a spray welding mechanism 6 are provided at the bottom of the mounting bracket 2. The mounting bracket 2 is installed at the edge of one side of the top of the machining base 1. The sealing clamping mechanism 3 includes a support platform 301 fixedly mounted at the middle position of the top of the machining base 1. A fixed sleeve 302 is mounted on the top of the support platform 301. A movable sleeve 303 is mounted on the top of the fixed sleeve 302. Grooves 304 are provided on both sides of the top of the fixed sleeve 302. A slot 305 is provided on one side of the inner wall of each of the two grooves 304. The two movable sleeves 304... L-shaped locking blocks 306 are fixedly provided on both sides of the bottom of the 3. Through slots 307 are provided on both sides of the fixed sleeve 302 and both sides of the movable sleeve 303. A connecting cylinder 308 is fixedly provided on the top of the inner wall of the movable sleeve 303. A connecting shaft 309 is inserted and connected to the inner wall of the connecting cylinder 308. A first connecting frame 310 is fixedly provided on the bottom of the connecting shaft 309. A spring 311 is sleeved on the outer wall of the connecting shaft 309. The two ends of the spring 311 are fixedly connected to the bottom of the connecting cylinder 308 and the top of the first connecting frame 310, respectively. A first compression ring 312 is sleeved on the outer wall of the movable sleeve 303. A second compression ring 313 is sleeved on the outer wall of the fixed sleeve 302. A first electric push rod 314 is installed on the inner wall of the support platform 301.

[0032] The positioning component 4 includes a second connecting frame 401 fixedly installed at the output end of the first electric push rod 314. The top of the second extrusion ring 313 is provided with multiple annular mounting grooves 402 at equal intervals. A positioning ring 403 is inserted through the inner wall of one of the annular mounting grooves 402. The positioning component 4 positions the metal butterfly valve sealing ring and lifts it up through the second extrusion ring 313 to extrude the first extrusion ring 312. When the first extrusion ring 312 is extruded and lifted, the first connecting frame 310 on its inner side pushes the connecting shaft 309 to insert and rise through the connecting cylinder 308, compressing the spring 311. This causes the sealing clamping mechanism 3 and the butterfly valve sealing ring to rise together to the welding area. After the welding is completed, the second extrusion ring 313 descends, and the first extrusion ring 312 descends and returns to its original position under the support of the first connecting frame 310 and the spring 311, but it will not disengage from the movable sleeve 303.

[0033] In use, the sealing clamping mechanism 3 is used to press and clamp the mating surface of the butterfly valve. During the clamping process, the movable sleeve 303 at the top of the fixed sleeve 302 is rotated so that the L-shaped locking block 306 at its bottom disengages from the slot 305 and is pulled out of the groove 304 to disassemble the movable sleeve 303. Then, according to the size of the butterfly valve sealing ring, a positioning ring 403 of the corresponding size is used to clamp it into the annular mounting groove 402 of the corresponding size. The two butterfly valve sealing rings are fitted onto the positioning ring 403 and supported by the second compression ring 313 to ensure that the inner wall of the two superimposed butterfly valve sealing rings is in contact with the outer wall of the positioning ring 403. Then, the movable sleeve 303 is inserted into the slot 305 by the L-shaped locking block 306 at its bottom, thereby fixing the movable sleeve 303 to the top of the fixed sleeve 302. The first electric push rod 314 is activated to push the second connecting rod. The connecting frame 401 slides in the through groove 307, thereby raising the second extrusion ring 313 and the superimposed metal butterfly valve sealing ring, and pressing it against the bottom of the first extrusion ring 312 above. The first electric push rod 314 continuously extends and retracts, and with the cooperation of the first extrusion ring 312 and the second extrusion ring 313, the superimposed metal butterfly valve sealing ring is squeezed tightly and raised to the welding area. In this design, when the butterfly valve metal sealing ring is superimposed and connected, there is no need for the operator to manually apply pressure to keep the sealing surface in tight contact. At the same time, under the positioning component 4, it is accurately aligned and automatically moved to the welding area. The whole process does not require manual operation by the operator, and the sealing surface is less likely to be offset by human shaking. This improves the processing efficiency and quality of the butterfly valve while reducing the operator's workload.

[0034] Furthermore, the two ends of the first connecting frame 310 pass through the inner walls of the through grooves 307 on both sides of the movable sleeve 303 and are fixedly connected to the two sides of the inner wall of the first extrusion ring 312. The two ends of the second connecting frame 401 pass through the inner walls of the through grooves 307 on both sides of the fixed sleeve 302 and are fixedly connected to the two sides of the inner wall of the second extrusion ring 313. After the outer wall of the bottom of the L-shaped locking block 306 is inserted into the groove 304, the movable sleeve 303 is rotated to move the L-shaped locking block 306 in the groove 304 and lock it into the slot 305.

[0035] The outer walls of the two L-shaped blocks 306 pass through the inner walls of the two grooves 304 and are connected to the inner walls of the two slots 305. When the two L-shaped blocks 306 completely fill the inner walls of the two slots 305, the inner walls of the four through slots 307 are connected to each other. When the slots 305 are completely filled, the through slots 307 on the upper and lower sides of the fixed sleeve 302 and the movable sleeve 303 are connected and aligned. The sealing clamping mechanism 3 is designed with detachable upper and lower sleeves to facilitate the disassembly and assembly of the welded butterfly valve sealing ring. During disassembly and assembly, the first compression ring 312 on the upper side will not be aligned and cause obstruction, which facilitates quick disassembly and assembly.

[0036] Furthermore, the rotating mechanism 5 includes a fixed frame 501 installed below the top of the mounting bracket 2. An annular connecting groove 502 is provided at the top edge of the fixed frame 501, and limit grooves 503 are provided on both sides of the inner wall of the annular connecting groove 502.

[0037] A rotating ring 504 is rotatably connected to the inner wall of the annular connecting groove 502. A limiting ring 505 is fixedly provided at the middle position of the inner and outer sides of the rotating ring 504. The outer walls of the two limiting rings 505 are rotatably connected to the inner walls of the two limiting grooves 503 respectively. A toothed ring 506 is fixedly provided at the top of the rotating ring 504. A gear 507 is meshed on the outer wall of the toothed ring 506. After the sealing clamping mechanism 3 lifts the metal butterfly valve sealing ring to the welding area, the spray welding mechanism 6 is rotated around the welding area by the rotating mechanism 5. During the rotation, the starting motor 8 drives the gear 507 to rotate, thereby meshing the toothed ring 506 so that it carries the rotating ring 504 to rotate in the annular connecting groove 502 at the bottom of the fixed frame 501. This causes the spray welding mechanism 6 to rotate around the metal butterfly valve sealing ring. When the rotating ring 504 in the rotating mechanism 5 rotates in the connecting groove 502, it is limited by the rotation of the limiting rings 505 on its inner and outer sides in the limiting groove 503 so that it will not detach from the connecting groove 502.

[0038] Furthermore, the spray welding mechanism 6 includes an L-shaped bracket 601 installed at the bottom of the rotating ring 504. A limiting groove 602 is provided at the bottom of the L-shaped bracket 601. A slider 603 is slidably connected to the inner wall of the limiting groove 602. A spray welding gun 604 is fixedly provided at the bottom of the slider 603. The slider 603 has protrusions on both sides, and recessed areas are provided on both sides of the inner wall of the limiting groove 602, so that the slider 603 is restricted from sliding in the limiting groove 602 and will not fall out of the limiting groove 602.

[0039] A second electric push rod 7 is installed on one side of the outer wall of the L-shaped bracket 601, and the output end of the second electric push rod 7 passes through the inner wall of the limiting slide groove 602 and is fixedly connected to one side of the slider 603. A motor 8 is installed at the corner below the top of the mounting bracket 2, and the output end of the motor 8 is fixedly connected to one end of the gear 507. While the spray welding mechanism 6 is driven to rotate by the rotating mechanism 5, the second electric push rod 7 is activated to push the slider 603 to move in the limiting slide groove 602, and moves the spray welding gun 604 close to the sealing docking area of ​​the metal butterfly valve sealing ring to perform spray welding sealing on the docking area. During this process, the spray welding mechanism 6 rotates and sprays welds around the area at a uniform speed under the drive of the rotating mechanism 5, so that the welding is very uniform and it is not easy to produce the problem of missed welding.

[0040] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0041] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for machining the sealing surface of an all-metal forged alloy steel butterfly valve, comprising a machining base (1) and a mounting bracket (2), wherein a sealing clamping mechanism (3) and a positioning component (4) are installed on the top of the machining base (1), and a rotating mechanism (5) and a spray welding mechanism (6) are provided on the bottom of the mounting bracket (2), wherein the mounting bracket (2) is installed on the edge of the top side of the machining base (1); Its features are: The sealing clamping mechanism (3) includes a support platform (301) fixedly installed at the top center of the processing base (1). A fixed sleeve (302) is installed on the top of the support platform (301), and a movable sleeve (303) is installed on the top of the fixed sleeve (302). Grooves (304) are provided on both sides of the top of the fixed sleeve (302), and slots (305) are provided on one side of the inner wall of each of the two grooves (304). L-shaped blocks (306) are fixedly provided on both sides of the bottom of each of the two movable sleeves (303). Through slots (307) are provided on both sides of the fixed sleeve (302) and both sides of the movable sleeve (303). (303) A connecting cylinder (308) is fixedly provided at the top of the inner wall. A connecting shaft (309) is inserted through the inner wall of the connecting cylinder (308). A first connecting frame (310) is fixedly provided at the bottom of the connecting shaft (309). A spring (311) is sleeved on the outer wall of the connecting shaft (309). The two ends of the spring (311) are fixedly connected to the bottom of the connecting cylinder (308) and the top of the first connecting frame (310) respectively. A first compression ring (312) is sleeved on the outer wall of the movable sleeve (303). A second compression ring (313) is sleeved on the outer wall of the fixed sleeve (302). A first electric push rod (314) is installed on the inner wall of the support platform (301). The positioning component (4) includes a second connecting frame (401) fixedly installed at the output end of the first electric push rod (314). The top of the second compression ring (313) is provided with a plurality of annular mounting grooves (402) at equal intervals, and a positioning ring (403) is inserted through the inner wall of one of the annular mounting grooves (402).

2. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 1, characterized in that: The two ends of the first connecting frame (310) pass through the inner walls of the through grooves (307) on both sides of the movable sleeve (303) and are fixedly connected to the two sides of the inner wall of the first extrusion ring (312). The two ends of the second connecting frame (401) pass through the inner walls of the through grooves (307) on both sides of the fixed sleeve (302) and are fixedly connected to the two sides of the inner wall of the second extrusion ring (313).

3. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 1, characterized in that: The outer walls of the two L-shaped blocks (306) pass through the inner walls of the two grooves (304) and are interlocked with the inner walls of the two slots (305). When the two L-shaped blocks (306) completely fill the inner walls of the two slots (305), the inner walls of the four through slots (307) are interconnected.

4. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 1, characterized in that: The rotating mechanism (5) includes a fixed frame (501) installed below the top of the mounting frame (2). An annular connecting groove (502) is provided at the edge of the top of the fixed frame (501), and limit grooves (503) are provided on both sides of the inner wall of the annular connecting groove (502).

5. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 4, characterized in that: The inner wall of the annular connecting groove (502) is rotatably connected to a rotating ring (504). A limiting ring (505) is fixedly provided at the middle position of the inner and outer sides of the rotating ring (504). The outer walls of the two limiting rings (505) are rotatably connected to the inner walls of the two limiting grooves (503). A toothed ring (506) is fixedly provided at the top of the rotating ring (504). A gear (507) meshes with the outer wall of the toothed ring (506).

6. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 1, characterized in that: The spray welding mechanism (6) includes an L-shaped bracket (601) installed at the bottom of the rotating ring (504). A limiting groove (602) is provided at the bottom of the L-shaped bracket (601). A slider (603) is slidably connected to the inner wall of the limiting groove (602). A spray welding gun (604) is fixedly provided at the bottom of the slider (603).

7. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 6, characterized in that: A second electric push rod (7) is installed on one side of the outer wall of the L-shaped bracket (601), and the output end of the second electric push rod (7) passes through the inner wall of the limiting slide groove (602) and is fixedly connected to one side of the slider (603). A motor (8) is installed at the corner below the top of the mounting bracket (2), and the output end of the motor (8) is fixedly connected to one end of the gear (507).

8. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 7, characterized in that: A control panel is fixedly provided on one side of the outer wall of the processing base (1), and the first electric push rod (314), the welding gun (604), the second electric push rod (7) and the motor (8) are all electrically connected to an external power supply through the control panel.

9. The method for machining the sealing surface of an all-metal forged alloy steel butterfly valve according to claim 1, wherein the method is as follows: Step 1: First, use the sealing clamping mechanism (3) to squeeze and clamp the mating surface of the butterfly valve. During the clamping process, rotate the movable sleeve (303) at the top of the fixed sleeve (302) to make the L-shaped block (306) at the bottom disengage from the slot (305) and pull out the groove (304) to disassemble the movable sleeve (303). Then, according to the size of the butterfly valve sealing ring, use the corresponding size positioning ring (403) to clamp it in the corresponding size annular mounting groove (402). Put the two butterfly valve sealing rings on the positioning ring (403) and support them with the second compression ring (313) to ensure that the inner wall of the two arc-overlapping butterfly valve sealing rings contacts the outer wall of the positioning ring (403). Step 2: Then, the movable sleeve (303) is inserted into the slot (305) through the L-shaped locking block (306) at the bottom, thereby fixing the movable sleeve (303) to the top of the fixed sleeve (302). The first electric push rod (314) is activated, which pushes the second connecting frame (401) to slide in the through groove (307), thereby taking the second extrusion ring (313) and the superimposed metal butterfly valve sealing ring upward, and pressing it against the bottom of the first extrusion ring (312) above. The first electric push rod (314) continues to extend and retract, and with the cooperation of the first extrusion ring (312) and the second extrusion ring (313), the superimposed metal butterfly valve sealing ring is squeezed tightly and raised to the welding area. Step 3: After the metal butterfly valve sealing ring is raised to the welding area by the sealing clamping mechanism (3), the starting motor (8) drives the gear (507) to rotate, thereby meshing the gear ring (506) and causing it to rotate with the rotating ring (504) in the annular connecting groove (502) at the bottom of the fixed frame (501), thereby causing the spray welding mechanism (6) to rotate around the metal butterfly valve sealing ring. Step four: While rotating, start the second electric push rod (7) to push the slider (603) to move in the limiting groove (602) and move the spray welding gun (604) close to the sealing docking area of ​​the metal butterfly valve sealing ring. Spray welding is performed on the docking area. During this process, the spray welding mechanism (6) rotates and sprays welding around the area at a uniform speed under the drive of the rotating mechanism (5), so that the welding is very uniform and it is not easy to produce the problem of missing welding.

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