A valve automatic casting process and casting device

Abstract

The present invention discloses a valve automatic casting process and casting device, and relates to the field of valve casting technology. The present invention discloses a valve automatic casting device, comprising a metal mesh belt conveyor line body and a sand box, both sides of the top of the metal mesh belt conveyor line body are fixedly installed with sand box guide rails, two groups of mold openings are opened inside the sand box guide rails, and mold opening assemblies are arranged at the positions of the two groups of mold openings, a sand filling assembly is installed on the top of the left mold opening assembly, a casting assembly is arranged between the sand filling assembly and the right mold opening, and a guide groove is arranged at the bottom of the sand box. The sand mold is conveyed to the sand filling assembly position by the metal mesh belt conveyor line body and the sand box guide rail, and the elastic airbag expands to make the key pressure rod close to the outer surface of the valve mold, and the layered sand pressing can be carried out tightly, and then the solenoid valve is opened to spray talcum powder evenly onto the outer surface of the valve mold, and the talcum powder coating process can be carried out while the layered sand pressing is carried out, and the sand pressing quality is high.

Description

Technical Field

[0001] The invention relates to the technical field of valve casting, and in particular to an automatic valve casting process and a casting device. Background Art

[0002] Valves are control components in fluid delivery systems, with functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, diversion or overflow pressure relief. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest shutoff valves to the various valves used in extremely complex automatic control systems. Sand casting is a common casting process for valves, suitable for valves of complex shapes. The process includes mixing sand and clay to make a mold, pouring molten metal into the mold, and removing the casting after the metal cools.

[0003] At present, in the sand casting process of valves, sand filling and demolding are performed manually, and the production efficiency is low. In the document (application number: CN202410534041.2), a valve automatic casting process and casting device are disclosed. Although the device can automatically perform sand filling and demolding, the device fills sand once and then uses a cover plate and gas pressure to press the molding sand. The one-time pressing is not tight enough, and bubbles are likely to remain between the molding sands, affecting the casting quality. At the same time, the device directly fills sand and presses sand, and the casting is easy to adhere to the molding sand, especially for valves with complex shapes, which makes subsequent demolding difficult. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a valve automatic casting process and a casting device.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A valve automatic casting device, comprising a metal mesh belt conveyor line body and a sand box, wherein both sides of the top of the metal mesh belt conveyor line body are fixedly installed with sand box guide rails, two groups of mold openings are opened inside the sand box guide rails, and mold opening assemblies are arranged at the positions of the two groups of mold openings, a sand filling assembly is installed on the top of the left mold opening assembly, a casting assembly is arranged between the sand filling assembly and the right mold opening, and a guide groove is opened at the bottom of the sand box;

[0007] The sand filling assembly comprises a top plate fixedly mounted on the top of the mold opening assembly, a second cylinder and a third cylinder are fixedly mounted on the top of the top plate, a valve mold is fixedly mounted on the bottom of the telescopic end of the second cylinder, a sand pressing plate is fixedly mounted on the bottom of the telescopic end of the third cylinder, a through hole is provided inside the sand pressing plate, the valve mold can pass through the through hole, a cavity is provided on the front and rear inner walls of the through hole, an elastic air bag is fixedly mounted inside the cavity, a plurality of groups of key pressure rods are fixedly connected to one side of the elastic air bag close to the through hole, a spray hole is provided inside the key pressure rod, and one end of the key pressure rod close to the through hole is triangular in design, a connecting hose is provided inside the cavity, the connecting hose passes through the elastic air bag, an electromagnetic valve is provided on the outside of the connecting hose, and the electromagnetic valve is located in the elastic air bag, the connecting hose is connected to the spray hole through a branch pipe, a plurality of groups of nozzles are provided on the inside of the connecting hose, and the nozzles extend to the left and right inner walls of the through hole, and the talcum powder mixed gas can be introduced into the elastic air bag;

[0008] A sand adding assembly is arranged on the top of the top plate.

[0009] Furthermore, the mold opening assembly includes a supporting platform, which spans the metal mesh belt conveyor line and is located at the mold opening position. A first cylinder is fixedly installed on both sides of the supporting platform, and a mold opening guide rail is fixedly installed on the telescopic end of the first cylinder, and the mold opening guide rail can be inserted into the mold opening.

[0010] Furthermore, a support plate is provided at the bottom of the mold opening guide rail, and two sets of support plates can be plugged into each other.

[0011] Furthermore, the sand adding assembly comprises a plurality of sand boxes fixedly mounted on the top of the top plate, a material valve 1 is arranged at the bottom of the sand box, a sand adding pipe is arranged at the bottom of the material valve 1, and the sand adding pipes can all pass through the through opening.

[0012] Furthermore, a powder box is fixedly installed on the outside of the sand box, a material valve 2 is arranged at the bottom of the powder box, a fan is fixedly installed on the outside of the sand box, a mixing bin is fixedly installed on the top of the top plate, the material valve 2 is connected with the mixing bin through a material pipe, the air outlet of the fan is connected with the mixing bin through an air pipe, a conduit is arranged at the bottom of the mixing bin, and the conduit is connected with the elastic airbag through a one-way valve.

[0013] Furthermore, metal mesh belt conveyor lines extend from both ends of the sand box guide rails.

[0014] Furthermore, a vibrator is fixedly installed on the outer side of the metal mesh belt conveyor line body, and the vibrator is close to the mold opening on the right side, and a collecting bucket is arranged at the right end of the metal mesh belt conveyor line body.

[0015] Furthermore, a handle is provided on the outer side of the sand box.

[0016] A valve automatic casting process comprises the following steps:

[0017] S1. Loading: Place two sets of sand box molds on the metal mesh belt conveyor line, and insert the sand box guide rails into the guide grooves;

[0018] S2, sand filling: The metal mesh belt conveyor conveys the sand boxes of the two combined molds to the bottom of the sand filling assembly, and the mold opening assembly on the left cooperates with the sand filling assembly to perform layered sand filling and layered talcum powder spraying;

[0019] S3, casting: The metal mesh belt conveyor conveys the sand-filled sand box to the bottom of the casting assembly to automatically complete the casting;

[0020] S4, unloading: The metal mesh belt conveyor slowly transports the cast sand box to the mold opening assembly position on the right. The casting cools during transportation, and the mold opening assembly separates the sand box. The metal mesh belt conveyor transports the casting and the sand box out in turn to complete the automatic casting of the valve.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention conveys the sand mold to the position of the sand filling component through the metal mesh belt conveyor line and the sand box guide rail, and the sand adding component intermittently adds sand by moving the sand pressing plate up and down. Then, by injecting talcum powder and gas into the elastic air bag, the elastic air bag expands to make the key pressure rod close to the outer surface of the valve mold, and the sand pressing can be carried out tightly in layers. Then, the solenoid valve is opened to evenly spray the talcum powder onto the outer surface of the valve mold. The talcum powder coating process can be carried out while the sand pressing is in layers, the sand pressing quality is high, and the subsequent demolding is convenient.

[0023] 2. The present invention can transport the sand boxes that are put together through the cooperation of the metal mesh belt conveyor line and the sand box guide rail. The sand box filled with sand is transported to the casting assembly position for casting, and then transported to the mold opening assembly position on the right. The casting is automatically cooled during the transportation process, and the mold opening assembly separates the sand box from the casting. After demolding, the casting and the sand box can be separated from the metal mesh belt conveyor line, and demolding can be automatically completed, with high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the metal mesh belt conveyor line of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the mold opening assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the sand filling assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the sand filling assembly and the valve mold of the present invention;

[0029] Figure 6 is an exploded view of the sand filling assembly of the present invention;

[0030] Figure 7 It is a schematic diagram of a sand pressing plate of the present invention;

[0031] Figure 8 This is an exploded view of the sand pressing plate of the present invention;

[0032] Fig. 9 It is a schematic diagram of a valve mold of the present invention.

[0033] 1. Metal mesh belt conveyor line; 2. Sand box guide rail; 21. Mold opening; 3. Vibrator; 4. Mold opening assembly; 41. Carrying platform; 42. First cylinder; 43. Mold opening guide rail; 44. Support plate; 5. Sand filling assembly; 51. Top plate; 52. Second cylinder; 53. Valve mold; 54. Third cylinder; 55. Sand pressing plate; 551. Through port; 552. Elastic air bag; 553. Key pressure rod; 554. Spray hole; 555. Connecting hose; 556. Solenoid valve; 557. Nozzle; 56. Sand box; 561. Material valve one; 562. Sand adding pipe; 57. Powder box; 58. Material valve two; 59. Fan; 510. Mixing bin; 511. Conduit; 6. Casting assembly; 7. Collecting bucket; 8. Sand box; 81. Handle; 82. Guide groove. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Embodiment 1

[0035] like Figure 1-Figure 9 As shown, a valve automatic casting device comprises a metal mesh belt conveyor line body 1 and a sand box 8, sand box guide rails 2 are fixedly installed on both sides of the top of the metal mesh belt conveyor line body 1, two groups of mold openings 21 are opened inside the sand box guide rails 2, and mold opening components 4 are arranged at the positions of the two groups of mold openings 21, a sand filling component 5 is installed on the top of the left mold opening component 4, a casting component 6 is arranged between the sand filling component 5 and the right mold opening 21, and a guide groove 82 is opened at the bottom of the sand box 8;

[0036] The sand filling assembly 5 includes a top plate 51 fixedly mounted on the top of the mold opening assembly 4, a second cylinder 52 and a third cylinder 54 are fixedly mounted on the top of the top plate 51, a valve mold 53 is fixedly mounted on the bottom of the telescopic end of the second cylinder 52, a sand pressing plate 55 is fixedly mounted on the bottom of the telescopic end of the third cylinder 54, a through hole 551 is provided inside the sand pressing plate 55, the valve mold 53 can pass through the through hole 551, cavities are provided on the front and rear inner walls of the through hole 551, an elastic air bag 552 is fixedly mounted inside the cavity, and a plurality of groups of piano key pressure rods are fixedly connected to the side of the elastic air bag 552 close to the through hole 551 553, a spray hole 554 is provided inside the key pressure rod 553, and one end of the key pressure rod 553 close to the through port 551 is triangular in design, a connecting hose 555 is provided inside the cavity, the connecting hose 555 penetrates the elastic airbag 552, an electromagnetic valve 556 is provided on the outside of the connecting hose 555, and the electromagnetic valve 556 is located in the elastic airbag 552, the connecting hose 555 is connected to the spray hole 554 through a branch pipe, and a plurality of nozzles 557 are provided on the inside of the connecting hose 555, and the nozzles 557 extend to the left and right inner walls of the through port 551, and the elastic airbag 552 can be fed with talcum powder mixed gas;

[0037] A sand adding assembly is provided on the top of the top plate 51 .

[0038] Casting process: align the guide grooves 82 at the bottom of the two groups of sand boxes 8 with the sand box guide rails 2, and then place them on the metal mesh belt conveyor line 1. The sand box guide rails 2 bring the two groups of sand boxes 8 together tightly. The metal mesh belt conveyor line 1 drives the sand boxes 8 to move rightward to the sand filling assembly 5 station, and then control the second cylinder 52 to operate. The second cylinder 52 drives the valve mold 53 to insert into the sand boxes 8, and then a certain amount of molding sand is injected into the sand boxes 8 through the sand adding assembly, and then control the third cylinder 54 to operate. The third cylinder 54 drives the sand pressing plate 55 to descend. After the sand pressing plate 55 descends to a certain depth, it just contacts with the uncompacted molding sand. At this time, the elastic air cylinder 54 is pressed to the bottom of the sand box 8. A mixture of talcum powder and gas is introduced into the airbag 552, and the elastic airbag 552 expands. The elastic airbag 552 pushes the key pressure rod 553 to be tightly attached to the outer surface of the valve mold 53, and multiple groups of key pressure rods 553 are adaptively fitted. At this time, the third cylinder 54 is controlled to continue to operate, and the third cylinder 54 drives the sand pressing plate 55 to descend. Since the end of the key pressure rod 553 close to the through port 551 is triangular in design, and the outer surface of the valve mold 53 is arc-shaped, when the sand pressing plate 55 descends, the key pressure rod 553 will expand and contract under the action of the outer surface of the valve mold 53, which will not affect the descent of the sand pressing plate 55, and it will always be tightly attached to the outer surface of the valve mold 53. The sand plate 55 descends to press the first layer of molding sand, and then the third cylinder 54 is controlled to drive the sand pressing plate 55 to rise, and at the same time, the solenoid valve 556 is controlled to open, and the talcum powder mixed gas inside the elastic airbag 552 is sprayed out through the spray hole 554 and the nozzle 557, and sprayed on the outer surface of the valve mold 53. At the same time, the air pressure inside the elastic airbag 552 is reduced, and the elastic airbag 552 shrinks under the action of its own elastic force. The elastic airbag 552 drives the key pressure rod 553 to retract and does not contact the outer surface of the valve mold 53, ensuring that the talcum powder is sprayed evenly. The rising speed of the third cylinder 54 is preset, so that the spraying height of the talcum powder is roughly the same as the next sand pressing height. The same, then a certain amount of molding sand is injected into the sand box 8 again through the sand adding component, and then the above-mentioned sand pressing steps are repeated again to ensure that the molding sand around the valve mold 53 can be tightly squeezed each time, the sand is pressed evenly, and talcum powder is sprayed in layers while pressing the sand to facilitate the subsequent separation of castings. It should be noted that in the last sand pressing, the molding sand completely covers the flange part above the valve mold 53, the sand pressing plate 55 is located above the flange part, and the key pressure rod 553 will not interfere with the flange part. At the same time, the inclination angle of the key pressure rod 553 is limited, and the pressing gap between the inclined end of the key pressure rod 553 and other positions is small, and the gap can be eliminated during the next sand pressing;

[0039] After the sand pressing is completed, the mold opening component 4 on the left is controlled to operate, and the mold opening component 4 on the left drives the two groups of sand boxes 8 to separate, and then the second cylinder 52 is controlled to drive the valve mold 53 to rise. The core can be placed in the sand box 8 according to the processing requirements to make the inside of the valve hollow after casting, and then the mold opening component 4 drives the two groups of sand boxes 8 to close together, and the metal mesh belt conveyor line body 1 drives the close-together sand boxes 8 to move right to the casting component 6 station. At the same time, another group of sand boxes 8 are conveyed to the sand filling component 5 station, and the casting component 6 casts the molten metal into the mold cavity in the sand box 8. After the casting is completed and the subsequent sand pressing is completed, the metal mesh belt conveyor line body 1 drives the close-together sand boxes 8 to move right, and moves a certain distance for a period of time. It should be noted that the metal mesh belt conveyor line 1 of the present invention is long enough, so that when the sand box 8 moves to the position of the right side mold opening component 4, the casting inside has been cooled to a temperature that can open the mold, and then the right side mold opening component 4 separates the sand box 8, and manually assists the casting and the molding sand to fall on the metal mesh belt conveyor line 1. After the casting and the molding sand are conveyed again, the right side mold opening component 4 brings the sand box 8 together, so that the sand box 8 and the casting are separated and conveyed. It should be noted that the spacing between the sand boxes 8 after casting is greater than the length of the sand box 8, so that when the right side mold opening component 4 is demolded, the sand box 8 has sufficient storage spacing to complete rapid demolding and unloading without manual lifting and placing. The present invention automatically casts the valve in an assembly line manner, and has high production efficiency.

[0040] Furthermore, a handle 81 is provided on the outer side of the sand box 8 to facilitate carrying the sand box 8 .

[0041] Furthermore, the top of the key pressure rod 553 is designed to be tilted downward, so that the spray hole 554 can spray out talcum powder better, and talcum powder is not easily accumulated on the top of the key pressure rod 553. Embodiment 2

[0042] Based on the above embodiment, a mold opening component 4 structure is provided;

[0043] like Figure 3 As shown, the mold opening assembly 4 includes a supporting platform 41, which spans the metal mesh belt conveyor line 1 and is located at the mold opening 21. A first cylinder 42 is fixedly installed on both sides of the supporting platform 41, and a mold opening guide rail 43 is fixedly installed at the telescopic end of the first cylinder 42, and the mold opening guide rail 43 can be inserted into the mold opening 21.

[0044] By controlling the first cylinders 42 on both sides to run synchronously in the opposite direction, the two groups of first cylinders 42 drive the two groups of mold opening guide rails 43 away from the mold opening 21, and then drive the two groups of sand boxes 8 to separate from the mold. The mold opening structure of the present invention is simple.

[0045] Furthermore, a support plate 44 is provided at the bottom of the mold opening guide rail 43, and two groups of support plates 44 can be plugged into each other to improve the mold opening stability. Embodiment 3

[0046] Based on the above embodiment, a sand adding component structure is provided;

[0047] like Figure 6 As shown, the sand adding assembly includes a plurality of sand boxes 56 fixedly mounted on the top of the top plate 51 , a material valve 561 is provided at the bottom of the sand box 56 , a sand adding pipe 562 is provided at the bottom of the material valve 561 , and the sand adding pipe 562 can pass through the through port 551 .

[0048] After the sand pressing is completed, the third cylinder 54 is controlled to drive the sand pressing plate 55 to rise. When the through port 551 exceeds the bottom of the sand adding pipe 562, the material valve 561 is controlled to open, and the molding sand in the sand box 56 is discharged into the sand box 8 through the sand adding pipe 562. By setting up multiple groups of sand boxes 56, the sand is added evenly. It should be noted that the bottom of the sand adding pipe 562 is slightly higher than the top of the sand box 8, and the sand adding pipe 562 will not affect the transportation of the sand box 8. Embodiment 4

[0049] On the basis of the above embodiment, it also includes: a powder box 57 is fixedly installed on the outside of the sand box 56, a material valve 2 58 is arranged at the bottom of the powder box 57, a fan 59 is fixedly installed on the outside of the sand box 56, a mixing bin 510 is fixedly installed on the top of the top plate 51, the material valve 2 58 is connected with the mixing bin 510 through a material pipe, the air outlet of the fan 59 is connected with the mixing bin 510 through an air pipe, and a conduit 511 is arranged at the bottom of the mixing bin 510, and the conduit 511 is connected with the elastic airbag 552 through a one-way valve.

[0050] After the sand is added, the control valve 58 is opened, and a certain amount of talcum powder enters the mixing bin 510, and then the fan 59 is started. The fan 59 blows the talcum powder in the mixing bin 510 into the elastic airbag 552, and through the setting of the one-way valve, when the fan 59 is closed, the talcum powder will not flow back, ensuring the stability of subsequent powder spraying. Embodiment 5

[0051] On the basis of the above-mentioned embodiment, the metal mesh belt conveyor line 1 is extended from both ends of the sand box guide rail 2. Through this design, the extended part of the left end of the sand box guide rail 2 for loading materials is convenient for loading materials first, so that the sand boxes 8 are brought together and then pushed onto the metal mesh belt conveyor line 1. The loading is stable, and the extended part of the right end of the sand box guide rail 2 for unloading materials can support the sand box 8 for unloading materials, thereby supporting the sand box 8 and preventing it from falling directly. Embodiment 6

[0052] On the basis of the above embodiment, the vibrator 3 is fixedly installed on the outer side of the metal mesh belt conveyor line body 1, and the vibrator 3 is close to the mold opening 21 on the right side, and a collecting bucket 7 is arranged at the right end of the metal mesh belt conveyor line body 1.

[0053] By setting the vibrator 3, the casting can be separated from the molding sand after the mold is opened. The molding sand is screened through the metal mesh belt on the metal mesh belt conveyor line 1, and finally the casting falls into the collecting bucket 7, which has a better material discharge effect. In addition, since the vibrator 3 is close to the mold opening 21 on the right side, the sand box 8 will vibrate when the mold is opened, which has a better mold opening and separation effect without the need for manual auxiliary operation. Embodiment 7

[0054] A valve automatic casting process comprises the following steps:

[0055] S1, loading: place two sets of sand boxes 8 on the metal mesh belt conveyor line 1, and insert the sand box guide rail 2 into the guide groove 82;

[0056] S2, sand filling: the metal mesh belt conveyor line 1 conveys the sand boxes 8 of the two combined molds to the bottom of the sand filling assembly 5, and the mold opening assembly 4 on the left cooperates with the sand filling assembly 5 to perform layered sand filling and layered talcum powder spraying;

[0057] S3, casting: the metal mesh belt conveyor line 1 conveys the sand-filled sand box 8 to the bottom of the casting assembly 6, and automatically completes the casting;

[0058] S4, unloading: The metal mesh belt conveyor line 1 slowly conveys the cast sand box 8 to the position of the mold opening component 4 on the right. The casting cools during the conveying, and the mold opening component 4 separates the sand box 8. The metal mesh belt conveyor line 1 conveys the casting and the sand box 8 out in turn to complete the automatic casting of the valve.

[0059] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A valve automatic casting device, comprising a metal mesh belt conveyor line (1) and a sand box (8), characterized in that: Sand box guide rails (2) are fixedly installed on both sides of the top of the metal mesh belt conveyor line body (1), two groups of mold openings (21) are opened inside the sand box guide rails (2), and mold opening components (4) are arranged at the positions of the two groups of mold openings (21), a sand filling component (5) is installed on the top of the left mold opening component (4), a casting component (6) is arranged between the sand filling component (5) and the right mold opening (21), and a guide groove (82) is opened at the bottom of the sand box (8); The sand filling assembly (5) comprises a top plate (51) fixedly mounted on the top of the mold opening assembly (4); a second cylinder (52) and a third cylinder (54) are fixedly mounted on the top of the top plate (51); a valve mold (53) is fixedly mounted on the bottom of the telescopic end of the second cylinder (52); a sand pressing plate (55) is fixedly mounted on the bottom of the telescopic end of the third cylinder (54); a through hole (551) is provided inside the sand pressing plate (55); the valve mold (53) can pass through the through hole (551); cavities are provided on the front and rear inner walls of the through hole (551); an elastic air bag (552) is fixedly mounted inside the cavity; a plurality of groups of piano key pressure rods are fixedly connected to a side of the elastic air bag (552) close to the through hole (551). (553), a spray hole (554) is provided inside the key pressure rod (553), and one end of the key pressure rod (553) close to the through-port (551) is triangular in design. A connecting hose (555) is provided inside the cavity, and the connecting hose (555) penetrates the elastic airbag (552). An electromagnetic valve (556) is provided on the outside of the connecting hose (555), and the electromagnetic valve (556) is located in the elastic airbag (552). The connecting hose (555) is connected to the spray hole (554) through a branch pipe. A plurality of nozzles (557) are provided on the inside of the connecting hose (555), and the nozzles (557) extend to the left and right inner walls of the through-port (551). The elastic airbag (552) can be fed with talcum powder mixed gas; A sand adding assembly is provided on the top of the top plate (51).

2. The automatic valve casting device according to claim 1, characterized in that: The mold opening assembly (4) comprises a support platform (41), the support platform (41) straddles the metal mesh belt conveyor line (1) and is located at the mold opening (21), first cylinders (42) are fixedly mounted on both sides of the support platform (41), and mold opening guide rails (43) are fixedly mounted on the telescopic ends of the first cylinders (42), and the mold opening guide rails (43) can be plugged into the mold opening (21).

3. The automatic valve casting device according to claim 2, characterized in that: A support plate (44) is provided at the bottom of the mold opening guide rail (43), and two groups of support plates (44) can be plugged into each other.

4. The automatic valve casting device according to claim 3, characterized in that: The sand adding assembly comprises a plurality of sand boxes (56) fixedly mounted on the top of the top plate (51); a material valve 1 (561) is arranged at the bottom of the sand box (56); a sand adding pipe (562) is arranged at the bottom of the material valve 1 (561); and the sand adding pipe (562) can pass through the through port (551).

5. The automatic valve casting device according to claim 4, characterized in that: A powder box (57) is fixedly mounted on the outside of the sand box (56), a material valve 2 (58) is arranged at the bottom of the powder box (57), a fan (59) is fixedly mounted on the outside of the sand box (56), a mixing bin (510) is fixedly mounted on the top of the top plate (51), the material valve 2 (58) is connected to the mixing bin (510) via a material pipe, an air outlet of the fan (59) is connected to the mixing bin (510) via an air pipe, a conduit (511) is arranged at the bottom of the mixing bin (510), and the conduit (511) is connected to an elastic air bag (552) via a one-way valve.

6. The automatic valve casting device according to claim 1, characterized in that: Metal mesh belt conveyor lines (1) extend from both ends of the sand box guide rail (2).

7. The automatic valve casting device according to claim 6, characterized in that: A vibrator (3) is fixedly mounted on the outer side of the metal mesh belt conveyor line body (1), and the vibrator (3) is close to the mold opening (21) on the right side, and a collecting bucket (7) is arranged at the right end of the metal mesh belt conveyor line body (1).

8. The automatic valve casting device according to claim 1, characterized in that: A handle (81) is provided on the outer side of the sand box (8).

9. A valve automatic casting process, using the valve automatic casting device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, loading: placing two sets of sand boxes (8) on the metal mesh belt conveyor (1) and inserting the sand box guide rail (2) into the guide groove (82); S2, sand filling: the metal mesh belt conveyor line (1) conveys the sand boxes (8) of the two combined molds to the bottom of the sand filling assembly (5), and the mold opening assembly (4) on the left cooperates with the sand filling assembly (5) to perform layered sand filling and layered talcum powder spraying; S3, casting: the metal mesh belt conveyor line (1) conveys the sand box (8) filled with sand to the bottom of the casting assembly (6), and the casting is automatically completed; S4, unloading: The metal mesh belt conveyor line (1) slowly conveys the cast sand box (8) to the position of the mold opening component (4) on the right. During the conveying, the casting cools down, and the mold opening component (4) separates the sand box (8). The metal mesh belt conveyor line (1) conveys the casting and the sand box (8) out in sequence, completing the automatic casting of the valve.

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