A casting device and method for producing a valve casting

Abstract

The application relates to the technical field of die casting, and discloses a casting device and method for valve casting production, which comprises a die casting machine and a holding furnace. A soup feeding machine is fixedly installed on the front side of the die casting machine. Two driving seats are fixedly installed on the upper end of the holding furnace. Driving blocks are slidably connected in the driving seats. Threaded rods are threadedly connected in the driving blocks. Sliding seats are fixedly connected to the lower ends of the driving blocks. Sliding blocks are slidably connected in the sliding seats. The sliding blocks are fixedly connected with scrapers and symmetrically arranged on the two sides of the scrapers. The lower ends of the scrapers are matched with the molten metal surface in the soup feeding machine. Through the step-by-step descending of the pressing plate during the backward movement of the scraper, the temporarily stored molten slag is evenly laid on the molten metal surface in the soup feeding machine in a thin layer, a dense covering layer is formed to isolate air, the further oxidation of the molten metal surface is effectively inhibited, and new molten slag is continuously generated in the slag scraping process.

Description

Technical Field

[0001] This invention relates to the field of die casting technology, and in particular to a casting apparatus and method for producing valve castings. Background Technology

[0002] Valves are key components in industrial fluid control systems, widely used in petroleum, natural gas, chemical, and power industries. The main castings of valves include the valve body, valve cover, valve disc, valve seat, valve stem, and handwheel. Among these, components with complex structures and high precision requirements, such as the valve body and valve cover, are typically manufactured using die casting. In the valve die casting process, molten metal is kept at a constant temperature in a holding furnace, and a casting machine scoops the molten metal from the furnace and injects it into the die casting machine to complete the die casting process.

[0003] In existing technologies, slag formed on the surface of the holding furnace is an unavoidable problem during die casting. To address this issue, CN121715535A discloses a vertical magnesium and aluminum alloy extrusion molding machine. This machine features a slag scraping device at the top of the holding furnace. A drive assembly moves the scraper along a guide structure, first lowering it to the molten metal surface, then moving two sets of scrapers horizontally in opposite directions to scrape the slag to the sides. A molten metal scoop is then collected from the clean area. However, this solution still has the following drawbacks in practical use: First, during the resetting process after scraping, oxide slag adheres to the inner side of the scraper as it slides along the molten metal surface, easily accumulating and clogging the scraper grooves, reducing the cleanliness of the scraped surface and making it difficult to maintain a constant scraping thickness and stable slag removal effect. Second, after scraping the slag to the sides, it accumulates directly, continuously exposing the molten surface to air for oxidation and the generation of new slag, resulting in continuous generation of new slag during the scraping operation and increasing the workload. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a casting apparatus and method for valve casting production, so as to solve the problems mentioned in the background art.

[0005] To solve the above problems, the present invention adopts the following technical solution: a casting device for valve casting production, comprising a die casting machine and a holding furnace, wherein a slag feeder is fixedly installed on the front side of the die casting machine, and two drive seats are fixedly installed on the upper end of the holding furnace. Drive blocks are slidably connected inside each drive seat, and threaded rods are threadedly connected inside each drive block. Sliding seats are fixedly connected to the lower end of each drive block, and sliding blocks are slidably connected inside each sliding seat. The sliding blocks are fixedly connected to scrapers and are symmetrically arranged on both sides of the scrapers. The lower end of the scraper is adapted to the surface of the molten liquid inside the slag feeder for scraping off the slag on the surface of the molten liquid.

[0006] Preferably, the front end of the heat preservation furnace is equipped with an electric motor via a motor mount, and the drive end of the electric motor is fixedly connected to a sprocket one, which is connected to two sprockets two via a chain.

[0007] Preferably, each of the two sprockets is fixedly connected to the threaded rod on the same side, the threaded rod is rotatably connected to the drive seat on the same side, the sliding seat is slidably engaged with the threaded rod on the same side, and the lower end of the scraper is evenly distributed with comb teeth.

[0008] Preferably, each of the sliding blocks is threaded with a double-acting lead screw in the middle, and a bevel gear 1 is fixedly connected to the upper part of the double-acting lead screw. Each bevel gear 1 is meshed with a bevel gear 2. Each bevel gear 2 is fixedly connected to a rotating shaft in the middle. Each rotating shaft is fixedly connected to a full gear 1 at the end away from the bevel gear 2. Each drive seat is fixedly connected to two racks 1 that are matched with the full gear 1 on the side away from the scraper.

[0009] Preferably, the bidirectional lead screw and the rotating shaft are rotatably connected to the sliding seat on the same side, and the number of teeth of the front rack is twice the number of teeth of the rear rack.

[0010] Preferably, the threaded rod has a sliding groove on the side near the scraper, a pressure plate is slidably connected to the front side of the scraper, two connecting shafts are fixedly connected to the upper end of the pressure plate, a spring is sleeved on the outside of each connecting shaft, a connecting plate is fixedly connected to the upper end of each spring, and a pulley is rotatably connected to the upper end of each connecting shaft.

[0011] Preferably, each of the springs is fixedly connected to the pressure plate, each of the connecting shafts is slidably engaged with the connecting plate, and each of the pulleys is slidably engaged with the sliding groove.

[0012] Preferably, each drive seat is fixedly connected to a rack two on the side near the scraper, each rack two is meshed with a full gear two, each full gear two is fixedly connected to a rotating seat inside, each rotating seat is rotatably connected to a ratchet inside, each ratchet has pawls evenly distributed on its outer circumference, each pawl is rotatably connected to the rotating seat through a rotating rod, and each pawl is fixedly connected to a spring two on the side away from the ratchet.

[0013] Preferably, the two racks are all located at the upper end of the slide groove, the ratchet is fixedly connected to the connecting shaft, and the two springs are fixedly connected to the rotating seat.

[0014] A casting and method for producing valve castings, applied to the casting apparatus for producing valve castings described above, characterized by comprising the following steps: S1. Start the motor, which drives sprocket 1 and chain to rotate sprocket 2. The drive block is driven to slide forward in the drive seat via the threaded rod, which in turn drives the sliding seat, sliding block and scraper to move forward as a whole. At the beginning of the scraper's forward movement, gear 1 meshes with rack 1 on the rear side. The double screw is driven to rotate via the rotating shaft, bevel gear 2 and bevel gear 1, so that the scraper descends to its lower end and is flush with the surface of the molten liquid in the soup dispenser, ensuring that the slag on the surface of the molten liquid can be completely scraped off during scraping. S2. The scraper continues to move forward, scraping the slag at the top of the molten liquid in the slurry machine forward and pushing it into the slag storage cavity formed by the scraper and the pressure plate. During the forward movement, the pulley slides along the guide groove, and drives the pressure plate to rise gradually through the connecting shaft. The spring stores energy, so that the upper end of the pulley always fits against the upper end of the groove, dynamically increasing the volume of the slag storage cavity, preventing the scraped slag from overflowing due to accumulation, and ensuring a smooth and continuous scraping stroke. S3. At the end of the scraper's forward movement, the first gear meshes with the first rack on the front side, and the number of teeth on the first rack on the front side is twice that of the rack on the rear side. This causes the scraper to first sink two centimeters into the lower end of the molten surface and then be lifted out. When the scraper moves backward, it sinks two centimeters into the lower end of the molten surface again and is lifted out. Through repeated sinking and lifting, the high-temperature molten liquid rapidly heats and melts the slag adhering to the scraper surface and causes it to fall off, preventing the slag from accumulating and clogging on the scraper surface and ensuring that the scraper maintains a clean scraping surface for each scraping stroke. S4. After the scraper moves to the front end, start the molten liquid feeder to scoop out the molten liquid from the cleaned surface and inject it into the die-casting machine for die casting. S5. The scraper begins to move backward, and the pressure plate gradually descends due to the reverse guidance of the pulley in the groove. The temporarily stored slag is evenly spread back to the surface of the molten liquid in the soup machine in a thin layer, forming a dense covering layer to isolate the air, effectively inhibiting further oxidation of the molten liquid surface and avoiding the continuous generation of new slag during the scraping process. S6. During the backward movement, the connecting shaft drives the second full gear forward through the ratchet. The pawl and ratchet are not locked, and the pressure plate can rise smoothly. When the scraper moves backward, the second full gear is locked by the pawl and cannot rotate. The first spring pulls the pressure plate so that the pulley always fits against the top wall of the groove. The teeth of the second full gear repeatedly squeeze the teeth of the second rack, causing the pressure plate to bounce up and down. During the bounce, the slag comes into full contact with the high-temperature melt and is heated and softened, making it easier to spread and adhere to the surface of the melt to form a uniform and dense covering layer. At the same time, the vibration generated by the second full gear repeatedly squeezing the second rack promotes the slag to be evenly dispersed and fall off on the surface of the pressure plate and scraper, preventing the slag from sticking and accumulating at the joint and getting stuck, ensuring the uniformity of the spreading thickness and the continuity of the scraping operation.

[0015] The casting apparatus and method for valve casting production provided by this invention have the following advantages: 1. By repeatedly immersing the scraper in the molten liquid in the feeder and then lifting it out in the forward and backward sections, the high-temperature molten liquid can quickly heat and melt the slag adhering to the scraper surface and make it fall off. This effectively prevents the slag from accumulating and clogging on the scraper surface, ensuring that the scraper maintains a clean scraping surface in each scraping stroke, thereby maintaining a constant scraping thickness and extremely high slag removal stability.

[0016] 2. As the pressure plate gradually descends during the backward movement of the scraper, the temporarily stored slag is evenly spread back to the surface of the molten liquid in the soup machine in a thin layer, forming a dense covering layer to isolate the air and effectively inhibit further oxidation of the molten liquid surface, thereby avoiding the continuous generation of new slag during the scraping process.

[0017] 3. The pressure plate bounces up and down during the process of spreading the molten slag, allowing the slag to come into full contact with the high-temperature molten liquid and soften it. The softened slag is easier to spread and adhere to the surface of the molten liquid, forming a uniform and dense covering layer. This effectively isolates air, inhibits oxidation of the molten liquid surface, and reduces the formation of new slag. At the same time, the repeated squeezing of the rack by the gear II generates vibration, which promotes the slag to be evenly dispersed and fall off the surface of the pressure plate and scraper. It also prevents the slag from sticking and accumulating at the joint of the pressure plate and scraper, further ensuring the uniformity of the spreading thickness and the continuity of the slag scraping operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A front perspective perspective view of a casting apparatus and method for producing valve castings provided in this application; Figure 2 A front perspective perspective view of a casting device and method for producing valve castings provided in this application, including a slag feeder and a slag hanging assembly installed on the upper end of a holding furnace. Figure 3 A front perspective three-dimensional schematic diagram of the slag scraping assembly of a casting apparatus and method for producing valve castings provided in this application; Figure 4 A side-view sectional perspective three-dimensional schematic diagram of a slag scraping assembly for a casting apparatus and method for producing valve castings provided in this application; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 This is a three-dimensional exploded view of a unidirectional motion component of a casting apparatus and method for producing valve castings, provided in this application.

[0020] In the diagram: 1. Die-casting machine; 2. Soup dispenser; 3. Keeping furnace; 4. Drive seat; 5. Drive block; 6. Threaded rod; 7. Electric motor; 8. Sprocket 1; 9. Chain; 10. Sprocket 2; 11. Sliding seat; 12. Sliding block; 13. Scraper; 14. Comb teeth; 15. Double-acting screw; 16. Bevel gear 1; 17. Bevel gear 2; 18. Rotating shaft; 19. Full gear 1; 20. Rack 1; 21. Pressure plate; 22. Connecting shaft; 23. Spring 1; 24. Connecting plate; 25. Slide groove; 26. Pulley; 27. Rack 2; 28. Full gear 2; 29. ​​Rotating seat; 30. Ratchet; 31. Pad; 32. Rotating rod; 33. Spring 2. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0022] like Figures 1-7 As shown, this embodiment proposes a casting device for valve casting production, including a die casting machine 1 and a holding furnace 3. A molten metal feeder 2 is fixedly installed on the front side of the die casting machine 1. Two drive seats 4 are fixedly installed on the upper end of the holding furnace 3. Drive blocks 5 are slidably connected inside each drive seat 4. Threaded rods 6 are threadedly connected inside each drive block 5. Sliding seats 11 are fixedly connected to the lower end of each drive block 5. Sliding blocks 12 are slidably connected inside each sliding seat 11. Sliding blocks 12 are fixedly connected to scrapers 13 and are symmetrically arranged on both sides of the scrapers 13. The lower end of the scrapers 13 is adapted to the surface of the molten liquid inside the molten metal feeder 2 and is used to scrape off the slag on the surface of the molten liquid.

[0023] In this embodiment, a motor 7 is mounted on the front end of the heat preservation furnace 3 via a motor mount. A sprocket 8 is fixedly connected to the drive end of the motor 7. The sprocket 8 is connected to two sprockets 10 via a chain 9.

[0024] In this embodiment, all sprockets 10 are fixedly connected to the threaded rods 6 on the same side, the threaded rods 6 are rotatably connected to the drive seat 4 on the same side, the sliding seats 11 are slidably engaged with the threaded rods 6 on the same side, and the lower end of the scraper 13 is evenly distributed with comb teeth 14.

[0025] In this embodiment, the middle of each sliding block 12 is threaded with a bidirectional lead screw 15, the upper part of the bidirectional lead screw 15 is fixedly connected with a bevel gear 16, each bevel gear 16 is meshed with a bevel gear 17, the middle of each bevel gear 17 is fixedly connected with a rotating shaft 18, the end of the rotating shaft 18 away from the bevel gear 17 is fixedly connected with a full gear 19, and the side of the drive seat 4 away from the scraper 13 is fixedly connected with two racks 20 that are matched with the full gear 19.

[0026] In this embodiment, the bidirectional lead screw 15 and the rotating shaft 18 are both rotatably connected to the sliding seat 11 on the same side, and the number of teeth of the front rack 20 is twice the number of teeth of the rear rack 20.

[0027] Specifically, before adding soup, the motor 7 is started, which drives the sprocket 10 to rotate via the sprocket 8 and chain 9. This, in turn, drives the drive block 5 to slide forward inside the drive seat 4 via the threaded rod 6. This, in turn, drives the sliding block 12 to move forward via the sliding seat 11, which in turn drives the scraper 13 to move forward, scraping the slag on the upper part of the molten liquid in the soup dispenser 2. At the beginning of the movement of the sliding block 12 by the sliding seat 11, the gear 19 meshes with the rack 20 on the rear side, which drives the bevel gear 17 to rotate via the rotating shaft 18. This, in turn, drives the double-acting screw 15 to rotate via the bevel gear 16, which in turn drives the scraper 13 to descend via the sliding block 12, so that the lower end of the scraper 13 is flush with the surface of the molten liquid in the soup dispenser 2, allowing the molten liquid to be completely scraped off. The slag on the surface of the liquid is scraped off. At the end of the forward movement of the scraper 13, the full gear 19 meshes with the rack 20 on the front side. The number of teeth on the rack 20 on the front side is twice that of the rack 20 on the rear side. The scraper 13 will first sink into the lower end of the molten liquid surface by two centimeters and then be lifted out. When the scraper 13 moves forward, it will sink into the lower end of the molten liquid surface by two centimeters again and then be lifted out. By repeatedly sinking into the molten liquid in the soup feeder 2 and lifting it out in the later and later stages of the forward movement, the high temperature of the molten liquid can quickly heat and melt the slag adhering to the surface of the scraper 13 and make it fall off. This effectively prevents the slag from accumulating and clogging on the surface of the scraper 13, ensuring that the scraper 13 maintains a clean scraping surface in each scraping stroke, thereby maintaining a constant scraping thickness and extremely high slag removal stability.

[0028] In this embodiment, the threaded rod 6 is provided with a sliding groove 25 on the side near the scraper 13. A pressure plate 21 is slidably connected to the front side of the scraper 13. Two connecting shafts 22 are fixedly connected to the upper end of the pressure plate 21. A spring 23 is sleeved on the outside of each connecting shaft 22. A connecting plate 24 is fixedly connected to the upper end of each spring 23. A pulley 26 is rotatably connected to the upper end of each connecting shaft 22.

[0029] In this embodiment, all springs 23 are fixedly connected to the pressure plate 21, all connecting shafts 22 are slidably engaged with the connecting plate 24, and all pulleys 26 are slidably engaged with the sliding groove 25.

[0030] Specifically, when scraper 13 moves to the foremost position, the molten slag feeder 2 is activated to scoop molten slag from the cleaned surface and inject it into die-casting machine 1 for die casting. During the forward movement of scraper 13, pulley 26, guided by chute 25, drives pressure plate 21 to gradually rise via connecting shaft 22. Spring 23 stores energy, ensuring the upper end of pulley 26 always fits against the upper end of chute 25. This dynamically increases the volume of the slag storage cavity formed by the angle between scraper 13 and pressure plate 21, preventing the scraped slag from overflowing due to accumulation and ensuring the smoothness of the scraping stroke. The process is smooth and continuous. As the scraper 13 moves forward, the pressure plate 21 gradually descends due to the guide sliding of the pulley 26 inside the groove 25. This allows the slag within the angle formed by the scraper 13 and the pressure plate 21 to be spread evenly on the cleaned molten pool surface again. As the pressure plate 21 gradually descends during the backward movement of the scraper 13, the temporarily stored slag is evenly spread back to the molten surface inside the ladle 2 in a thin layer, forming a dense covering layer to isolate air and effectively inhibit further oxidation of the molten surface, thereby preventing the continuous generation of new slag during the scraping process.

[0031] In this embodiment, racks 27 are fixedly connected to the side of the drive seat 4 near the scraper 13. Racks 27 are meshed with gears 28. Rotary seats 29 are fixedly connected inside the gears 28. Ratchets 30 are rotatably connected inside the rotary seats 29. Pads 31 are evenly distributed on the outer periphery of the ratchet 30. Pads 31 are rotatably connected to the rotary seats 29 through rotating rods 32. Springs 33 are fixedly connected to the side of the pads 31 away from the ratchet 30.

[0032] In this embodiment, racks 27 are all located at the upper end of the slide groove 25, ratchet 30 are all fixedly connected to the connecting shaft 22, and springs 33 are all fixedly connected to the rotating seat 29.

[0033] Specifically, during the forward movement of the connecting shaft 22 via the ratchet 30 driving the full gear 28, the pawl 31 and ratchet 30 are not locked, allowing the full gear 28 to rotate even though it meshes with the rack 27, thus enabling the pressure plate 21 to rise smoothly. During the backward movement of the scraper 13, the full gear 28 needs to rotate in the opposite direction due to its meshing with the rack 27, but the pawl 31 and ratchet 30 are locked, preventing the full gear 28 from rotating. The spring 23 pulls the pressure plate 21, thus limiting the connecting shaft 22, ensuring that the upper end of the pulley 26 always adheres to the inner top wall of the groove 25. This causes the teeth of the full gear 28 to repeatedly press against the teeth of the rack 27, resulting in the pressure plate 21 moving backward. During the process of gradually spreading the slag back onto the surface of the molten metal, repeated up-and-down bouncing occurs. As the pressure plate 21 moves backward and spreads the slag, it bounces back and forth, allowing the slag to come into full contact with the high-temperature molten metal during the bouncing process and be heated and softened. The softened slag is easier to spread and adhere to the surface of the molten metal, forming a uniform and dense covering layer. This effectively isolates the air, inhibits oxidation of the molten metal surface, and reduces the formation of new slag. At the same time, the gear 28 repeatedly squeezes the rack 27 to generate vibration, which promotes the slag to be evenly dispersed and fall off the surfaces of the pressure plate 21 and scraper 13, and prevents the slag from sticking and accumulating at the joints of the pressure plate 21 and scraper 13, thus ensuring the uniformity of the spreading thickness and the continuity of the scraping operation.

[0034] A casting and method for producing valve castings, applied to a casting apparatus for producing valve castings as described above, characterized by comprising the following steps: S1. Start the motor 7, which drives the sprocket 10 to rotate through the sprocket 8 and chain 9. The drive block 5 is driven to slide forward in the drive seat 4 through the threaded rod 6, which in turn drives the sliding seat 11, sliding block 12 and scraper 13 to move forward as a whole. At the beginning stage of the scraper 13 moving forward, the gear 19 meshes with the rack 20 on the rear side, and drives the double screw 15 to rotate through the rotating shaft 18, bevel gear 17 and bevel gear 16, so that the scraper 13 descends to its lower end and is flush with the surface of the molten liquid in the soup dispenser 2, so that the slag on the surface of the molten liquid can be completely scraped off during scraping. S2. The scraper 13 continues to move forward, scraping the slag at the upper end of the molten liquid in the molten liquid feeder 2 forward and pushing it into the slag storage cavity formed by the scraper 13 and the pressure plate 21. During the forward movement, the pulley 26 slides along the guide groove 25, and drives the pressure plate 21 to rise gradually through the connecting shaft 22. The spring 23 stores energy, so that the upper end of the pulley 26 always fits against the upper end of the groove 25, dynamically increasing the volume of the slag storage cavity, preventing the scraped slag from overflowing due to accumulation, and ensuring a smooth and continuous scraping stroke. S3. At the end of the forward movement of scraper 13, the full gear 19 meshes with the front rack 20, and the number of teeth of the front rack 20 is twice that of the rear rack. This causes scraper 13 to first be submerged two centimeters below the surface of the molten liquid and then lifted out. When scraper 13 moves backward, it is submerged two centimeters below the surface of the molten liquid again and then lifted out. Through repeated submersion and lifting out, the high-temperature molten liquid rapidly heats and melts the slag adhering to the surface of scraper 13 and causes it to fall off, preventing slag from accumulating and clogging on the surface of scraper 13, and ensuring that scraper 13 maintains a clean scraping surface in each scraping stroke. S4. After the scraper 13 moves to the front end, start the molten liquid feeder 2 to scoop out the molten liquid from the cleaned surface and inject it into the die casting machine 1 for die casting. S5. The scraper 13 begins to move backward, and the pressure plate 21 gradually descends due to the reverse guidance and sliding of the pulley 26 in the groove 25. The temporarily stored slag is evenly spread back to the surface of the molten liquid in the soup machine 2 in a thin layer, forming a dense covering layer to isolate the air, effectively inhibiting further oxidation of the molten liquid surface and avoiding the continuous generation of new slag during the slag scraping process. S6. During the backward movement, the connecting shaft 22 drives the full gear 28 forward through the ratchet 30. The pawl 31 and the ratchet 30 are in an unlocked state, and the pressure plate 21 can rise smoothly. When the scraper 13 moves backward, the full gear 28 is locked by the pawl 31 and cannot rotate. The spring 23 pulls the pressure plate 21 so that the pulley 26 always fits against the inner top wall of the slide groove 25. The teeth of the full gear 28 repeatedly squeeze the teeth of the rack 27, causing the pressure plate 21 to bounce up and down. The slag comes into full contact with the high temperature melt during the bounce and is heated and softened, making it easier to spread and adhere to the surface of the melt to form a uniform and dense covering layer. At the same time, the vibration generated by the full gear 28 repeatedly squeezing the rack 27 promotes the slag to be evenly dispersed and fall off on the surface of the pressure plate 21 and the scraper 13, preventing the slag from sticking and accumulating at the joint and getting stuck, ensuring the uniformity of the spreading thickness and the continuity of the scraping operation.

[0035] It should be noted that in this application, the die-casting machine 1 mainly includes a mold clamping mechanism, an injection mechanism, a frame, a hydraulic drive system, an electrical control system, a cooling system, an ejection mechanism, a clamping force monitoring component, and a mold mounting base. Under the action of the clamping mechanism, the moving mold and the fixed mold are tightly closed and maintain sufficient clamping force to prevent the mold from expanding and generating flash during the filling process of the molten metal. The molten metal is sent into the injection chamber, and the injection mechanism pushes the injection punch to press the liquid metal into the closed mold cavity at high speed with a set pressure and speed. The molten metal fills and solidifies under high pressure. After the casting is cooled, the mold clamping mechanism drives the moving mold to open, and the ejection mechanism ejects the formed casting from the mold, completing one die-casting cycle. After demolding, a release agent needs to be sprayed to ensure that the valve casting can be successfully demolded after recasting and cooling.

[0036] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A casting apparatus for producing valve castings, comprising a die-casting machine (1) and a holding furnace (3), characterized in that, The die-casting machine (1) is fixedly installed with a soup feeder (2) on the front side. The upper end of the heat preservation furnace (3) is fixedly installed with two drive seats (4). The drive seats (4) are all slidably connected with drive blocks (5). The drive blocks (5) are all threadedly connected with threaded rods (6). The lower end of the drive blocks (5) is fixedly connected with a sliding seat (11). The sliding seat (11) is all slidably connected with a sliding block (12). The sliding blocks (12) are all fixedly connected with a scraper (13) and are symmetrically arranged on both sides of the scraper (13). The lower end of the scraper (13) is adapted to the surface of the molten liquid in the soup feeder (2) and is used to scrape off the slag on the surface of the molten liquid.

2. The casting apparatus for valve casting production according to claim 1, characterized in that, The front end of the heat preservation furnace (3) is equipped with an electric motor (7) via a motor mount. The drive end of the electric motor (7) is fixedly connected to a sprocket (8). The sprocket (8) is connected to two sprockets (10) via a chain (9).

3. The casting apparatus for valve casting production according to claim 2, characterized in that, The sprockets (10) are all fixedly connected to the threaded rods (6) on the same side. The threaded rods (6) are all rotatably connected to the drive seat (4) on the same side. The sliding seats (11) are all slidably engaged with the threaded rods (6) on the same side. The lower end of the scraper (13) is evenly distributed with comb teeth (14).

4. A casting apparatus for valve casting production according to claim 3, characterized in that, The middle part of each sliding block (12) is threaded with a double-acting screw (15), the upper part of the double-acting screw (15) is fixedly connected with a bevel gear (16), the bevel gear (16) is meshed with a bevel gear (17), the middle part of the bevel gear (17) is fixedly connected with a rotating shaft (18), the end of the rotating shaft (18) away from the bevel gear (17) is fixedly connected with a full gear (19), and the side of the drive seat (4) away from the scraper (13) is fixedly connected with two racks (20) that are matched with the full gear (19).

5. A casting apparatus for valve casting production according to claim 4, characterized in that, The bidirectional lead screw (15) and the rotating shaft (18) are rotatably connected to the sliding seat (11) on the same side, and the number of teeth of the front rack (20) is twice the number of teeth of the rear rack (20).

6. A casting apparatus for valve casting production according to claim 5, characterized in that, The threaded rod (6) has a sliding groove (25) on the side near the scraper (13). The front side of the scraper (13) is slidably connected to a pressure plate (21). The upper end of the pressure plate (21) is fixedly connected to two connecting shafts (22). The outside of each connecting shaft (22) is fitted with a spring (23). The upper end of each spring (23) is fixedly connected to a connecting plate (24). The upper end of each connecting shaft (22) is rotatably connected to a pulley (26).

7. A casting apparatus for valve casting production according to claim 6, characterized in that, All springs (23) are fixedly connected to the pressure plate (21), all connecting shafts (22) are slidably engaged with the connecting plate (24), and all pulleys (26) are slidably engaged with the sliding groove (25).

8. A casting apparatus for valve casting production according to claim 7, characterized in that, Each drive seat (4) is fixedly connected to a rack two (27) on the side near the scraper (13). Each rack two (27) is meshed with a full gear two (28). Each full gear two (28) is fixedly connected to a rotating seat (29). Each rotating seat (29) is rotatably connected to a ratchet (30). Each ratchet (30) has pawls (31) evenly distributed on its outer circumference. Each pawl (31) is rotatably connected to the rotating seat (29) through a rotating rod (32). Each pawl (31) is fixedly connected to a spring two (33) on the side away from the ratchet (30).

9. A casting apparatus for valve casting production according to claim 8, characterized in that, The racks (27) are all located at the upper end of the slide groove (25), the ratchet (30) are all fixedly connected to the connecting shaft (22), and the springs (33) are all fixedly connected to the rotating seat (29).

10. A casting and method for producing valve castings, applied to the casting apparatus for producing valve castings as described in claim 9, characterized in that, Includes the following steps: S1. Start the motor (7), drive the sprocket (8) and chain (9) to rotate the sprocket (10), drive the drive block (5) to slide forward in the drive seat (4) through the threaded rod (6), and then drive the sliding seat (11), sliding block (12) and scraper (13) to move forward as a whole; at the beginning stage of the scraper (13) moving forward, the gear (19) meshes with the rack (20) on the rear side, and drives the double screw (15) to rotate through the shaft (18), bevel gear (17) and bevel gear (16), so that the scraper (13) descends to its lower end and is flush with the surface of the melt in the soup dispenser (2), ensuring that the slag on the surface of the melt can be completely scraped off when scraping; S2. The scraper (13) continues to move forward, scraping the slag at the top of the molten liquid in the molten liquid feeder (2) forward and pushing it into the slag storage cavity formed by the scraper (13) and the pressure plate (21). During the forward movement, the pulley (26) slides along the guide groove (25), and drives the pressure plate (21) to rise gradually through the connecting shaft (22). The spring (23) stores energy, so that the upper end of the pulley (26) always fits the upper end of the groove (25), dynamically increasing the volume of the slag storage cavity, preventing the scraped slag from overflowing due to accumulation, and ensuring that the scraping stroke is smooth and continuous. S3. At the end of the forward movement of the scraper (13), the full gear (19) meshes with the rack (20) on the front side, and the number of teeth of the rack (20) on the front side is twice that of the rack on the rear side, so that the scraper (13) is first submerged into the lower end of the molten surface by two centimeters and then lifted out. When the scraper (13) moves backward, it is submerged into the lower end of the molten surface by two centimeters again and then lifted out. Through repeated submersion and lifting out, the high temperature molten liquid rapidly heats and melts the slag adhering to the surface of the scraper (13) and causes it to fall off, preventing the slag from accumulating and clogging on the surface of the scraper (13) and ensuring that the scraper (13) maintains a clean scraping surface in each scraping stroke. S4. After the scraper (13) moves to the front end, start the molten liquid feeder (2) to scoop out the molten liquid from the cleaned surface and inject it into the die casting machine (1) for die casting. S5. The scraper (13) begins to move backward, and the pressure plate (21) gradually descends due to the reverse guidance sliding of the pulley (26) in the groove (25). The temporarily stored slag is evenly spread back to the surface of the melt in the soup machine (2) in a thin layer, forming a dense covering layer to isolate the air, effectively inhibiting further oxidation of the melt surface and avoiding the continuous generation of new slag during the scraping process. S6. During the backward movement, the connecting shaft (22) drives the full gear two (28) forward through the ratchet (30). The pawl (31) and the ratchet (30) are in an unlocked state, and the pressure plate (21) can rise smoothly. When the scraper (13) moves backward, the full gear two (28) is locked by the pawl (31) and cannot rotate. The spring one (23) pulls the pressure plate (21) so that the pulley (26) always fits against the inner top wall of the slide groove (25). The teeth of the full gear two (28) repeatedly squeeze the rack two (28). The teeth of 27) cause the pressure plate (21) to bounce up and down. During the bounce, the slag comes into full contact with the high temperature melt and is heated and softened, making it easier to spread and adhere to the surface of the melt to form a uniform and dense covering layer. At the same time, the vibration generated by the repeated squeezing of the rack (27) by the gear two (28) causes the slag to be evenly dispersed and fall off on the surface of the pressure plate (21) and scraper (13), preventing the slag from sticking and accumulating at the joint and getting stuck, ensuring the uniformity of the spreading thickness and the continuity of the scraping operation.

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