Stop valve hand wheel machining method

Abstract

The invention belongs to the technical field of hand wheel machining, and provides a stop valve hand wheel machining method which comprises the following steps: S1, preparing materials for producing valve hand wheel castings, production mechanical equipment and related grinding tools; s2, furnace charge proportioning is conducted, and smelting is conducted at the set smelting temperature and time; s3, the smelted casting part material is poured into a mold cavity of the grinding tool for pouring molding, and then cooling is conducted; s4, the hand wheel is subjected to shot blasting treatment through steel balls, the surface quality of the hand wheel is enhanced, and burrs are removed; and S5, the hand wheel is painted and dried through painting equipment, and a finished hand wheel product is obtained. Compared with the prior art, the hand wheel painting device has the following beneficial effects that the first closing plate and the second closing plate can be rapidly and adaptively replaced according to the size of a through hole in a hand wheel, the two ends of the through hole can be completely closed, it is guaranteed that paint cannot enter the through hole in the painting process, and the painting quality of the hand wheel is improved.

Description

Technical Field

[0001] This invention belongs to the field of handwheel machining technology, and particularly relates to a method for machining a stop valve handwheel. Background Technology

[0002] To prevent the valve handwheel from oxidizing and rusting due to prolonged exposure to air after production, paint needs to be applied to the surface of the handwheel.

[0003] In existing technologies, there are two main methods for coating handwheels. One method involves using a paint brush to evenly coat the handwheel, avoiding the square hole. This method is time-consuming and labor-intensive, and the paint quality is not high, which is not conducive to production. The other method is to directly place the handwheel in a paint tank for dip coating. However, in this method, a large amount of oil will remain in the square hole of the handwheel, making it difficult for the valve stem to pass through the hole and be fixed to the handwheel when it is installed. Therefore, in subsequent processing, it is necessary to remove the square hole of the handwheel, which increases the workload. To address the above technical problems, Chinese patent CN110394605B proposes a method that uses two sets of pneumatic rods to push the first set of triangular clamping blocks and the second set of clamping blocks respectively, so that the paint is fixed through the inner hole of the handwheel and prevented from entering the square hole. However, the square hole diameter varies for different models of handwheels, making it inconvenient to replace the corresponding clamping blocks. Moreover, most existing handwheels are fixed and connected by a round hole and keyway, which increases the limitation of equipment use. Summary of the Invention

[0004] The purpose of this invention is to provide a method for machining a stop valve handwheel, which aims to solve the technical problem in the prior art that it is inconvenient to change the corresponding clamping device according to the handwheel model.

[0005] This invention is implemented as follows: a method for machining a stop valve handwheel, comprising the following steps: Step S1: Prepare the materials, production machinery and equipment, and related molds for producing valve handwheel castings; Step S2: Proportion the furnace charge, set the melting temperature and time, and perform melting; Step S3: Pour the smelted casting material into the mold cavity for casting and shaping, and then cool it; Step S4: Use steel balls to shot blast the handwheel to enhance its surface quality and remove burrs; Step S5: Apply paint and dry the handwheel using a painting machine to obtain the finished handwheel; The painting equipment includes a base with conveyor belts rotatably mounted at both ends. A limiting plate and a positioning plate for positioning a handwheel are provided on the base. A movable frame is slidably mounted on the base, and a servo module for driving the movable frame to reciprocate is also mounted on the base. An electric telescopic rod pointing towards the base is fixedly mounted on the horizontal section of the movable frame. A connecting chamber is fixedly mounted at the output end of the electric telescopic rod. A camera is fixedly mounted on the surface of the connecting chamber near the base. A branch pipe is provided on the connecting chamber. A first inner plate is threadedly connected to the end of the branch pipe away from the connecting chamber. A first sealing plate is provided on the first inner plate. A second inner plate is slidably mounted on the branch pipe. A second sealing plate is provided on the second inner plate. The first inner plate and the second inner plate are connected. A fixing plate for fixing the handwheel is provided at the end of the branch pipe away from the connecting chamber. A motor for driving the branch pipe to rotate is fixedly mounted on the connecting chamber. A paint tank and a drying tank are fixedly mounted on the base.

[0006] Further technical solution: The limiting plate is provided in two sets. A sliding plate is fixedly installed on the limiting plate. The sliding plate is slidably installed on the side wall of the base. The base is threaded with fixing screws for fixing the sliding plate. The positioning plate is fixedly installed in the base and is perpendicular to the limiting plate. Both the positioning plate and the limiting plate are located in the conveying area of ​​the conveyor belt.

[0007] A further technical solution: An installation cylinder is fixedly installed on the surface of the first inner plate near the communicating chamber. A support rod is threadedly connected inside the installation cylinder. A second magnet is fixedly installed at the end of the support rod. A connecting groove for use with the second magnet is opened on the second inner plate.

[0008] A further technical solution: A connecting pipe is rotatably installed on the connecting chamber. The connecting pipe passes through the side wall of the connecting chamber and is coaxially threadedly connected to the branch pipe. The connecting pipe is connected to the connecting chamber and the branch pipe, and the motor drives the connecting pipe to rotate.

[0009] A further technical solution: multiple sets of power cylinders are fixedly installed at the end of the branch pipe away from the connecting chamber. A piston rod is slidably installed inside the power cylinder. A fixing plate is fixedly installed at the end of the piston rod that extends out of the power cylinder. An air pump that supplies air into the connecting chamber is fixedly installed on the connecting chamber. An exhaust pipe is fixedly installed on the side of the connecting chamber. A solenoid valve is installed on the exhaust pipe.

[0010] Further technical solution: The first inner plate has multiple sets of grooves on the side near the communicating chamber, and multiple sets of mounting posts are fixedly installed on the first sealing plate. The mounting posts are located in the corresponding grooves and are slidably connected to the first inner plate. An electromagnet is fixedly installed on the bottom surface of the groove. The electromagnet works in conjunction with a first magnet fixedly installed at the end of the mounting post. The connection structure of the second inner plate and the second sealing plate is the same as that of the first inner plate and the first sealing plate.

[0011] A further technical solution: Two sets of brackets are fixedly installed inside the paint tank. Two sets of scrapers are slidably installed on the two sets of brackets. Adjusting screws are threaded onto both sets of brackets. The adjusting screws are rotatably connected to the corresponding scrapers. The two sets of scrapers have different lengths.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Remove the branch pipe from the connecting pipe, then remove the first inner plate from the branch pipe, and then remove the second inner plate from the branch pipe. Replace the first and second sealing plates with the same size as the handwheel model. Install the new first and second sealing plates on the branch pipe, and then connect the branch pipe to the connecting pipe to replace the first and second sealing plates. This allows for quick adaptation and replacement of the first and second sealing plates according to the size of the through hole on the handwheel, improving the flexibility and practicality of the equipment. Furthermore, the first and second sealing plates can completely seal both ends of the through hole, ensuring that no paint enters the through hole during the painting process, thus ensuring that it will not affect the subsequent installation and use of the handwheel and improving the painting quality of the handwheel.

[0013] 2. After the handwheel is painted and excess paint is initially removed, the first and second sealing plates are moved away from each other. At this point, the surfaces of the first and second sealing plates protrude from the ends of the through holes. The movement of the first and second sealing plates allows the paint on the first and second sealing plates to separate from the paint on the end face of the through hole before the paint dries. This ensures that the paint on the side of the through hole can neatly and completely cover the end face of the through hole, preventing the paint on the handwheel from forming a whole with the paint on the first and second sealing plates after drying, which would damage the paint on the handwheel when the first and second sealing plates separate. This further improves the quality of the handwheel painting.

[0014] 3. After the first and second sealing plates move away from each other, as the moving frame moves laterally, the moving frame stops moving when the end of the upper scraper contacts the surface of the branch pipe, while the branch pipe continues to rotate. This allows the scraper to rub against the surfaces of the first and second sealing plates and the branch pipe, scraping away the paint. The scraped paint is thrown out and falls into the paint tank under centrifugal force. After a set time, the moving frame continues to move for subsequent processes. The scraper removes excess paint from the first and second sealing plates and the branch pipe, preventing unnecessary paint from entering the subsequent drying process, reducing unnecessary paint consumption, and eliminating the need for subsequent paint cleaning of the first and second sealing plates, thus improving the practicality of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2This is a schematic diagram of the clamping handwheel structure in this invention.

[0017] Figure 3 This is a cross-sectional view of the branch pipe in this invention.

[0018] Figure 4 This is a schematic diagram of the installation structure of the first inner plate and the second inner plate in this invention.

[0019] Figure 5 This is a schematic diagram of the structure of the first inner plate in this invention.

[0020] Figure 6 This is a schematic diagram of the structure of the second inner plate in this invention.

[0021] Figure 7 for Figure 3 A magnified view of region A1 in the middle.

[0022] Figure 8 for Figure 7 A magnified view of region A2 in the middle.

[0023] Figure 9 This is a schematic diagram of the paint box in this invention.

[0024] In the attached diagram: 1. Base; 2. Conveyor belt; 3. Slide plate; 4. Limiting plate; 5. Positioning plate; 6. Moving frame; 7. Servo module; 8. Electric telescopic rod; 9. Connecting chamber; 10. Connecting pipe; 11. Camera; 12. Motor; 13. Air pump; 14. Exhaust pipe; 15. Branch pipe; 16. First inner plate; 17. First sealing plate; 18. Groove; 19. Mounting column; 20. Electromagnet; 21. First magnet; 22. Mounting cylinder; 23. Support rod; 24. Second magnet; 25. Second inner plate; 26. Second sealing plate; 27. Connecting groove; 28. Paint box; 29. ​​Drying box; 30. Bracket; 31. Adjusting screw; 32. Scraper; 33. Power cylinder; 34. Piston rod; 35. Fixing plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0027] like Figures 1-9 As shown, the present invention provides a method for machining a stop valve handwheel, which includes the following steps: Step S1: Prepare the materials, production machinery and equipment, and related molds for producing valve handwheel castings; Step S2: Proportion the furnace charge, set the melting temperature and time, and perform melting; Step S3: Pour the smelted casting material into the mold cavity for casting and shaping, and then cool it; Step S4: Use steel balls to shot blast the handwheel to enhance its surface quality and remove burrs; Step S5: Apply paint and dry the handwheel using a painting machine to obtain the finished handwheel; The painting equipment includes a base 1, with conveyor belts 2 rotatably mounted at both ends of the base 1. The base 1 is equipped with a limiting plate 4 and a positioning plate 5 for positioning a handwheel. Two sets of limiting plates 4 are provided, and a sliding plate 3 is fixedly mounted on each limiting plate 4. The sliding plate 3 is slidably mounted on the side wall of the base 1. Fixing screws for fixing the sliding plate 3 are threaded onto the base 1. The positioning plate 5 is fixedly mounted inside the base 1 and is perpendicular to the limiting plates 4. Both the positioning plate 5 and the limiting plates 4 are located within the conveying area of ​​the conveyor belt 2. A movable frame 6 is slidably mounted on the base 1, and the base 1 is equipped with... A servo module 7 drives the reciprocating movement of the movable frame 6. An electric telescopic rod 8 pointing towards the base 1 is fixedly installed on the horizontal section of the movable frame 6. A connecting chamber 9 is fixedly installed at the output end of the electric telescopic rod 8. A camera 11 is fixedly installed on the surface of the connecting chamber 9 near the base 1. A branch pipe 15 is provided on the connecting chamber 9. A first inner plate 16 is threadedly connected to the end of the branch pipe 15 away from the connecting chamber 9. A first sealing plate 17 is provided on the first inner plate 16. A second inner plate 25 is slidably installed on the branch pipe 15. A second sealing plate 26 is provided on the second inner plate 25. The first inner plate 16 and the second inner plate 25 are connected. The first inner plate 16, near the connecting chamber 9, is connected to the plate 25. A mounting cylinder 22 is fixedly installed on its surface. A support rod 23 is threaded into the mounting cylinder 22. A second magnet 24 is fixedly installed at the end of the support rod 23. A connecting groove 27 for cooperating with the second magnet 24 is provided on the second inner plate 25. A fixing plate 35 for fixing the handwheel is provided at the end of the branch pipe 15 away from the connecting chamber 9. Multiple sets of power cylinders 33 are fixedly installed at the end of the branch pipe 15 away from the connecting chamber 9. A piston rod 34 is slidably installed inside the power cylinder 33. The fixing plate 35 is fixedly installed on the piston rod 34 extending out of the power cylinder. At one end of 33, an air pump 13 for supplying air into the connecting chamber 9 is fixedly installed on the connecting chamber 9. An exhaust pipe 14 is fixedly installed on the side of the connecting chamber 9. A solenoid valve is installed on the exhaust pipe 14. A motor 12 for driving the branch pipe 15 to rotate is fixedly installed on the connecting chamber 9. A connecting pipe 10 is rotatably installed on the connecting chamber 9. The connecting pipe 10 passes through the side wall of the connecting chamber 9 and is coaxially threaded with the branch pipe 15. The connecting pipe 10 is connected to the connecting chamber 9 and the branch pipe 15. The motor 12 drives the connecting pipe 10 to rotate. A paint box 28 and a drying box 29 are fixedly installed on the base 1.

[0028] In practical application, according to the size of the handwheel, the positions of the two sets of limiting plates 4 are adjusted and fixed so that the width between the two sets of limiting plates 4 is the same as the outer diameter of the handwheel. According to the size of the handwheel through hole, the corresponding size of the first sealing plate 17 and the second sealing plate 26 are selected. The branch pipe 15 is removed from the connecting pipe 10, and the first inner plate 16 is threadedly connected and fixed to the end of the branch pipe 15. According to the height of the handwheel through hole, the support rod 23 is rotated to adjust the height of the second magnet 24. Then, the second inner plate 25 and the second sealing plate 26 are sleeved on the branch pipe 15 from the end away from the first inner plate 16 until the second magnet 24 enters the connecting groove 27. At this time, the second magnet 24 attracts and fixes the second inner plate 25. The protrusions on the first sealing plate 17 and the second sealing plate 26 correspond to each other. The distance between the first sealing plate 17 and the second sealing plate 26 and the surface is the same as the height of the through hole on the handwheel. The set height of paint is added to the paint tank 28. After adjustment, place the handwheel to be painted on the conveyor belt 2 and between the two sets of limiting plates 4. Move the handwheel by the conveyor belt 2 until the handwheel contacts the positioning plate 5. At this time, the conveyor belt 2 stops moving and the position of the handwheel is positioned by the limiting plate 4 and the positioning plate 5. At this time, the handwheel is located directly below the connecting chamber 9. The camera 11 captures the position of the keyway detected by the handwheel. Then, the motor 12 drives the branch pipe 15 to rotate at a set angle so that the protruding positions on the first sealing plate 17 and the second sealing plate 26 correspond to the positions of the keyway. After alignment, the electric telescopic rod 8 drives the connecting chamber 9 to move downward so that the first sealing plate 17 and the second sealing plate 26 enter the through hole. When the lower surface of the first sealing plate 17 is flush with the lower end of the through hole, the movement stops. At this time, the upper surface of the second sealing plate 26 is flush with the upper end of the through hole. The two ends of the through hole are sealed by the first sealing plate 17 and the second sealing plate 26. Then, the air pump 13 delivers air into the connecting chamber 9. The air enters the power cylinder 33 along the connecting pipe 10 and the branch pipe 15. Under the push of the air, the piston rod 34 moves. The piston rod 34 drives the fixing plate 35 to contact the inner wall of the handwheel through hole. Under the action of air pressure, the fixing plate 35 abuts against the inner wall of the handwheel through hole to achieve a fixed connection between the handwheel and the branch pipe 15. After fixing, the electric telescopic rod 8 drives the handwheel to move upward past the positioning plate 5. Then, the servo module 7 drives the moving frame 6 to move above the paint tank 28. The electric telescopic rod 8 drives the handwheel to move downward again so that the handwheel is completely immersed in the paint. At this time, the paint level is higher than the upper surface of the second sealing plate 26 by a set height. After the handwheel enters the paint, the moving frame 6 keeps moving so that the handwheel is in full contact with the paint. After the moving frame 6 moves a set distance, the handwheel moves upward to get away from the paint. At the same time, the motor 12 drives the handwheel to rotate and throw off the excess paint. Then the handwheel moves upward again to the height of the drying box 29. When the moving frame 6 continues to move, the handwheel enters the drying box 29 for drying. After drying, the handwheel moves to another set of conveyor belts 2. At this time, the solenoid valve on the exhaust pipe 14 is opened to release the gas in the connecting chamber 9, thereby releasing the fixing plate 35 from fixing the handwheel. Then the electric telescopic rod 8 drives the connecting chamber 9 to move upward so that the first sealing plate 17 is separated from the handwheel. Then the moving frame 6 returns to the initial position to continue to clamp the next set of handwheels for painting. When painting a handwheel of a different model, remove the branch pipe 15 from the connecting pipe 10, then remove the first inner plate 16 from the branch pipe 15, and then remove the second inner plate 25 from the branch pipe 15. Replace the first sealing plate 17 and the second sealing plate 26 with the same size as the handwheel model. Repeat the above steps to install the new first sealing plate 17 and the second sealing plate 26 on the branch pipe 15. Then connect the branch pipe 15 to the connecting pipe 10 to replace the first sealing plate 17 and the second sealing plate 26. The first sealing plate 17 and the second sealing plate 26 can be quickly adapted and replaced according to the size of the through hole on the handwheel, which improves the flexibility and practicality of the equipment. Moreover, the first sealing plate 17 and the second sealing plate 26 can completely seal the two ends of the through hole, ensuring that no paint will enter the through hole during the painting process, ensuring that it will not affect the subsequent installation and use of the handwheel, and improving the painting quality of the handwheel.

[0029] like Figure 1 , Figure 3 , Figures 7-9 As shown, this invention provides a method for processing a stop valve handwheel. The first inner plate 16 has multiple sets of grooves 18 on its side near the communicating chamber 9. Multiple sets of mounting posts 19 are fixedly installed on the first sealing plate 17. The mounting posts 19 are located within the corresponding grooves 18 and are slidably connected to the first inner plate 16. An electromagnet 20 is fixedly installed on the bottom surface of the groove 18. The electromagnet 20 cooperates with a first magnet 21 fixedly installed at the end of the mounting post 19. The connection structure of the second inner plate 25 and the second sealing plate 26 is the same as the connection structure of the first inner plate 16 and the first sealing plate 17.

[0030] Specifically, two sets of brackets 30 are fixedly installed inside the paint box 28. Two sets of scrapers 32 are slidably installed on the two sets of brackets 30. Adjusting screws 31 are threadedly installed on both sets of brackets 30. The adjusting screws 31 are rotatably connected to the corresponding scrapers 32. The two sets of scrapers 32 have different lengths.

[0031] In practical application, after the first sealing plate 17 and the second sealing plate 26 are installed, the electromagnet 20 is energized. The electromagnet 20 generates a repulsive force on the first magnet 21, so that the first sealing plate 17 is tightly attached to the first inner plate 16 and the second sealing plate 26 is tightly attached to the second inner plate 25. When the electromagnet 20 is energized in the reverse direction, the first sealing plate 17 moves away from the first inner plate 16 and the second sealing plate 26 moves away from the second inner plate 25. The height of the two sets of scrapers 32 is adjusted according to the distance between the first sealing plate 17 and the second sealing plate 26 away from the surface in the away state. The height of the two sets of scrapers 32 is adjusted by adjusting the screw 31 so that the distance between the two sets of scrapers 32 and the surface is the same as the distance between the first sealing plate 17 and the second sealing plate 26 away from the surface in the away state. After the handwheel is painted and excess paint is initially removed, the electromagnet 20 is reverse-energized. The electromagnet 20 attracts the first magnet 21, causing the first sealing plate 17 and the second sealing plate 26 to move away from each other. At this time, the ends of the through holes protrude from the surfaces of the first sealing plate 17 and the second sealing plate 26. The movement of the first sealing plate 17 and the second sealing plate 26 allows the paint on the first sealing plate 17 and the second sealing plate 26 to separate from the paint on the end face where the through hole is located before the paint dries. This ensures that the paint on the side of the through hole can neatly and completely cover the end face where the through hole is located, preventing the paint on the handwheel from forming a whole with the paint on the first sealing plate 17 and the second sealing plate 26 after drying, which would damage the paint on the handwheel when the first sealing plate 17 and the second sealing plate 26 separate. This further improves the quality of the handwheel painting. After the first sealing plate 17 and the second sealing plate 26 move away from each other, as the moving frame 6 moves laterally, the first sealing plate 17 and the second sealing plate 26 respectively come into contact with the two sets of scrapers 32. The lower scraper 32 contacts the lower surface of the first sealing plate 17, and the upper scraper 32 contacts the upper surface of the second sealing plate 26. When the end of the upper scraper 32 contacts the surface of the branch pipe 15, the moving frame 6 stops moving, and the branch pipe 15 continues to rotate. Thus, the scraper 32 can generate friction and scrape the surfaces of the first sealing plate 17, the second sealing plate 26, and the branch pipe 15. The scraped paint is thrown out and falls into the paint tank 28 under the action of centrifugal force. After a set time, the moving frame 6 continues to move to carry out the subsequent process. The scraper 32 removes the excess paint on the first sealing plate 17, the second sealing plate 26, and the branch pipe 15, avoiding unnecessary paint from entering the subsequent drying process, reducing unnecessary paint consumption, and eliminating the need for subsequent paint cleaning of the first sealing plate 17 and the second sealing plate 26, thus improving the practicality of the equipment.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for machining a stop valve handwheel, characterized in that, It includes the following steps: Step S1: Prepare the materials, production machinery and equipment, and related molds for producing valve handwheel castings; Step S2: Proportion the furnace charge, set the melting temperature and time, and perform melting; Step S3: Pour the smelted casting material into the mold cavity for casting and shaping, and then cool it; Step S4: Use steel balls to shot blast the handwheel to enhance its surface quality and remove burrs; Step S5: Apply paint and dry the handwheel using a painting machine to obtain the finished handwheel; The painting equipment includes a base (1), with conveyor belts (2) rotatably mounted at both ends of the base (1). The base (1) is provided with a limiting plate (4) and a positioning plate (5) for positioning handwheels. A movable frame (6) is slidably mounted on the base (1), and a servo module (7) is provided on the base (1) to drive the movable frame (6) to move back and forth. An electric telescopic rod (8) pointing towards the base (1) is fixedly mounted on the horizontal section of the movable frame (6). A connecting chamber (9) is fixedly mounted at the output end of the electric telescopic rod (8). A camera (11) is fixedly mounted on the surface of the connecting chamber (9) near the base (1). A branch pipe (15) is provided on the connecting chamber (9). The branch pipe (15) is threaded to a first inner plate (16) at the end away from the connecting chamber (9). A first sealing plate (17) is provided on the first inner plate (16). A second inner plate (25) is slidably installed on the branch pipe (15). A second sealing plate (26) is provided on the second inner plate (25). The first inner plate (16) is connected to the second inner plate (25). A fixing plate (35) for fixing the handwheel is provided at the end of the branch pipe (15) away from the connecting chamber (9). A motor (12) for driving the branch pipe (15) to rotate is fixedly installed on the connecting chamber (9). A paint box (28) and a drying box (29) are fixedly installed on the base (1).

2. The method for machining a stop valve handwheel according to claim 1, characterized in that, The limiting plate (4) is provided in two sets. A sliding plate (3) is fixedly installed on the limiting plate (4). The sliding plate (3) is slidably installed on the side wall of the base (1). The base (1) is threaded with fixing screws for fixing the sliding plate (3). The positioning plate (5) is fixedly installed inside the base (1) and the positioning plate (5) is perpendicular to the limiting plate (4). The positioning plate (5) and the limiting plate (4) are both located in the conveying area of ​​the conveyor belt (2).

3. The method for machining a stop valve handwheel according to claim 1, characterized in that, An installation cylinder (22) is fixedly installed on the surface of the first inner plate (16) near the connecting chamber (9). A support rod (23) is threaded inside the installation cylinder (22). A second magnet (24) is fixedly installed at the end of the support rod (23). A connecting groove (27) is provided on the second inner plate (25) to cooperate with the second magnet (24).

4. The method for machining a stop valve handwheel according to claim 1, characterized in that, A connecting pipe (10) is rotatably installed on the connecting chamber (9). The connecting pipe (10) penetrates the side wall of the connecting chamber (9) and is coaxially threaded with the branch pipe (15). The connecting pipe (10) is connected to the connecting chamber (9) and the branch pipe (15). The motor (12) drives the connecting pipe (10) to rotate.

5. The method for machining a stop valve handwheel according to claim 1, characterized in that, Multiple sets of power cylinders (33) are fixedly installed at the end of the branch pipe (15) away from the connecting chamber (9). A piston rod (34) is slidably installed inside the power cylinder (33). A fixing plate (35) is fixedly installed at the end of the piston rod (34) that extends out of the power cylinder (33). An air pump (13) for supplying air to the connecting chamber (9) is fixedly installed on the connecting chamber (9). An exhaust pipe (14) is fixedly installed on the side of the connecting chamber (9). A solenoid valve is installed on the exhaust pipe (14).

6. The method for machining a stop valve handwheel according to claim 1, characterized in that, The first inner plate (16) has multiple sets of grooves (18) on the side near the connecting chamber (9). Multiple sets of mounting posts (19) are fixedly installed on the first sealing plate (17). The mounting posts (19) are located in the corresponding grooves (18) and are slidably connected to the first inner plate (16). An electromagnet (20) is fixedly installed on the bottom surface of the groove (18). The electromagnet (20) is used in conjunction with the first magnet (21) fixedly installed at the end of the mounting post (19). The connection structure of the second inner plate (25) and the second sealing plate (26) is the same as the connection structure of the first inner plate (16) and the first sealing plate (17).

7. The method for machining a stop valve handwheel according to claim 1, characterized in that, The paint box (28) is fixedly installed with two sets of brackets (30). Two sets of scrapers (32) are slidably installed on the two sets of brackets (30). Adjusting screws (31) are threaded on both sets of brackets (30). The adjusting screws (31) are rotatably connected to the corresponding scrapers (32). The two sets of scrapers (32) have different lengths.

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