A casting device for large castings

Abstract

The application relates to the technical field of casting technology, in particular to a casting device for large castings, which comprises a frame, two lower casting molds are installed in the frame, upper casting molds are arranged on the upper ends of the lower casting molds, a preheating mechanism for preheating the lower casting molds and the upper casting molds is arranged in the frame, a hoisting mechanism for hoisting the upper casting molds is arranged on the frame, a cooling mechanism for cooling the lower casting molds and the upper casting molds is arranged on the frame, and liquid injection ports are arranged on the upper ends of the upper casting molds. Compared with the prior art, the mold can be automatically preheated in all directions, the preheating efficiency of the mold is improved, the cooling efficiency of the mold is high, the energy of hot oil is fully utilized, the energy utilization rate is improved, and energy waste is reduced.

Description

Technical Field

[0001] This invention relates to the field of casting technology, specifically to a casting apparatus for large castings. Background Technology

[0002] Large castings typically refer to heavy and complex metal parts formed through casting processes. They must meet requirements for high strength, high wear resistance, and dimensional accuracy. Large casting is a process of melting metal, pouring it into shape, and solidifying it into a large metal component of a specific shape. It is widely used in machinery manufacturing, mining, power and other fields.

[0003] Before casting large parts, the mold needs to be preheated to avoid material defects caused by excessive temperature difference during casting. Due to the large size of the mold, manual preheating is required, which takes a long time and results in a significant amount of heat being lost directly, leading to low preheating efficiency. Furthermore, after the large part is cast, the mold temperature needs to be reduced to a suitable level before opening the mold. Currently, water cooling is used to cool the mold, which carries away the heat through continuously flowing cold water. However, the heat carried away by the cold water cannot be effectively recovered and reused, resulting in energy waste.

[0004] Therefore, based on the above problems, we have invented a casting device for large castings. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a casting apparatus for large castings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a casting device for large castings, comprising a frame, two lower casting molds installed within the frame, an upper casting mold covered by the upper cover of the lower casting molds, a preheating mechanism for preheating the lower and upper casting molds within the frame, a hoisting mechanism for hoisting the upper casting mold on the frame, a cooling mechanism for cooling the lower and upper casting molds on the frame, and a liquid injection port installed at the upper end of the upper casting mold.

[0007] Furthermore, the preheating mechanism includes two slide rails fixedly installed with the frame. The upper end of each slide rail is provided with a preheating adjustment groove. A preheating adjustment screw is rotatably installed within the preheating adjustment groove. One end of each of the two preheating adjustment screws rotatably passes through the slide rail and the frame and is connected via a preheating transmission mechanism. A movable motor is installed outside the frame. The drive shaft of the movable motor is coaxially installed with the preheating adjustment screw. A movable block is threaded onto the external thread of each preheating adjustment screw. A U-shaped plate is slidably installed outside the slide rail. The movable block is fixedly installed with the U-shaped plate. An L-shaped plate is installed at the upper end of each of the two U-shaped plates. A rotating plate is provided between the two L-shaped plates. A preheating plate is fixed at both the upper and lower ends of the rotating plate. An air chamber is provided inside the rotating plate. A fixing ring is provided on the outer side of the air chamber. The fixing ring is rotatably installed with the rotating plate. Both L-shaped plates are fixedly connected to the fixing ring. An adjustment mechanism is provided at the end of the preheating plate away from the rotating plate. The system includes a groove, an adjusting screw rotatably mounted within the groove, a threaded block threaded onto the adjusting screw, a flame head mounted on the threaded block, and a gas chamber connected to the flame head. A transmission chamber is located within the rotating plate, and a rotating shaft rotatably mounted within the transmission chamber. An adjusting motor is embedded within the rotating plate, and its drive shaft rotatably passes through the rotating plate and is coaxially mounted with the rotating shaft. A first pulley is coaxially mounted on the rotating shaft, and a second pulley is coaxially mounted on the adjusting screw. The first and second pulleys are connected by a synchronous belt. A through-hole matching the synchronous belt is provided on the preheating plate. A preheating motor is mounted at the lower end of the L-shaped plate, and its drive shaft rotatably passes through the L-shaped plate and is coaxially mounted with a first gear. A second gear is rotatably mounted on the L-shaped plate. An annular toothed groove meshing with the second gear is provided on the outer side of the rotating plate, and the first and second gears are meshed together.

[0008] Furthermore, the preheating transmission mechanism includes two preheating pulleys, which are coaxially mounted with two preheating adjusting screws, and are connected to each other by a synchronous belt drive.

[0009] Furthermore, the hoisting mechanism includes two grooves set within the frame, each groove containing a hoisting screw. One end of each hoisting screw rotatably passes through the frame and is connected via a hoisting transmission mechanism. A horizontal plate is slidably mounted on the frame, with the two hoisting screws threaded through the horizontal plate. A hoisting motor is mounted outside the frame, its drive shaft coaxially with the hoisting screws. Two take-up rollers are positioned above the horizontal plate, rotatably mounted to the horizontal plate via a mounting plate. Each take-up roller is coaxially mounted with a take-up pulley, which is connected via a synchronous belt. A take-up motor is mounted outside the mounting plate, its drive shaft rotatably passing through the mounting plate and coaxially with the take-up rollers. A hoisting rope is wound around the take-up rollers, its lower end passing through the horizontal plate and connected to a hook. A matching hook is mounted on the upper end of the upper casting mold.

[0010] Furthermore, the hoisting transmission mechanism includes two hoisting pulleys, which are coaxially mounted with two hoisting screws respectively, and are connected by a synchronous belt drive.

[0011] Furthermore, the cooling mechanism includes a cold oil tank and a hot oil tank mounted on a frame. The cold oil tank and the hot oil tank are connected by a transmission pipe. Two cold oil delivery pipes are connected to the cold oil tank, and two hot oil recovery pipes are connected to the hot oil tank. Cooling oil channels are provided in both the lower and upper casting molds. The ends of the two cold oil delivery pipes away from the cold oil tank are branched off and connected to the cooling oil channels in the two lower casting molds and the two upper casting molds, respectively. The ends of the hot oil recovery pipes away from the hot oil tank are branched off and connected to the cooling oil channels in the two lower casting molds and the two upper casting molds, respectively.

[0012] Furthermore, a three-way valve is installed at the branching points of the cold oil delivery pipe and the hot oil recovery pipe.

[0013] Furthermore, the two preheating plates are arranged in a rotationally symmetrical manner about the center position of the rotating plate.

[0014] Furthermore, an air intake pipe is embedded through the L-shaped plate, one end of which is connected to the air chamber, and the other end of which is connected to an external gas pipe.

[0015] Compared with the prior art, the present invention provides a casting apparatus for large castings, which has the following beneficial effects:

[0016] 1. By setting a preheating mechanism, the inner side of the mold can be preheated automatically in all directions, which can reduce energy waste and preheat both halves of the mold at the same time, improving the preheating efficiency of the mold.

[0017] 2. By setting up a cooling mechanism, the mold can be cooled efficiently by absorbing heat from the mold through cold oil. At the same time, the heated oil can be returned to preheat the mold, making full use of the residual heat generated by the mold, improving energy utilization and reducing energy waste.

[0018] This application can automatically preheat the mold in all directions, improving the preheating efficiency of the mold, and has a high cooling efficiency for the mold. It also makes full use of the energy of the hot oil, improving the energy utilization rate and reducing energy waste. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a bottom perspective view of the lower casting mold in this invention;

[0021] Figure 3 This is a schematic diagram of the preheating mechanism in this invention;

[0022] Figure 4 This is a partial perspective view of the preheating mechanism in this invention;

[0023] Figure 5 This is a perspective view of the hoisting mechanism in this invention;

[0024] Figure 6 This is a schematic diagram of the cooling mechanism in this invention.

[0025] In the diagram: 1. Frame; 2. Lower casting mold; 3. Upper casting mold; 4. Preheating mechanism; 5. Lifting mechanism; 6. Cooling mechanism; 7. Injection port; 8. Preheating transmission mechanism; 9. Preheating pulley; 10. Moving motor; 11. Moving block; 12. U-shaped plate; 13. L-shaped plate; 14. Rotating plate; 15. Air chamber; 16. Fixing ring; 17. Preheating plate; 18. Preheating motor; 19. First gear; 20. Second gear; 21. Transmission chamber; 22. Rotating shaft; 23. Adjusting motor; 24. First pulley; 25. Second pulley; 26. 27. Adjusting groove; 28. Adjusting screw; 29. ​​Threaded block; 30. Flamethrower head; 31. Groove; 32. Lifting screw; 33. Lifting transmission mechanism; 34. Lifting pulley; 35. Lifting motor; 36. Horizontal plate; 37. Winding roller; 38. Winding pulley; 39. Slide rail; 40. Lifting rope; 41. Winding motor; 42. Mounting plate; 43. Cold oil tank; 44. Hot oil tank; 45. Transmission pipe; 46. Hot oil recovery pipe; 47. Three-way valve; 48. Cold oil delivery pipe; 49. Cooling oil passage; 50. Preheating adjusting groove; 51. Preheating adjusting screw. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a casting apparatus for large castings.

[0028] like Figures 1-6 As shown, a casting device for large castings includes a frame 1, two lower casting molds 2 are installed inside the frame 1, an upper casting mold 3 is provided on the upper cover of the lower casting molds 2, a preheating mechanism 4 is provided inside the frame 1 for preheating the lower casting molds 2 and the upper casting mold 3, a hoisting mechanism 5 is provided on the frame 1 for hoisting the upper casting mold 3, a cooling mechanism 6 is provided on the frame 1 for cooling the lower casting molds 2 and the upper casting mold 3, and a liquid injection port 7 is installed at the upper end of the upper casting mold 3.

[0029] To preheat the mold, a preheating mechanism 4 is provided. The preheating mechanism 4 includes two slide rails 38 fixedly installed with the frame 1. A preheating adjustment groove 49 is provided at the upper end of each slide rail 38, and a preheating adjustment screw 50 is rotatably installed within the groove 49. One end of each of the two preheating adjustment screws 50 rotatably passes through the slide rails 38 and the frame 1 and is connected via a preheating transmission mechanism 8. Specifically, the preheating transmission mechanism 8 includes two preheating rollers 9, which are coaxially installed with the two preheating adjustment screws 50 respectively. The two preheating rollers 9 are connected by a synchronous belt drive. A moving motor 10 is installed outside the frame 1, and the drive shaft of the moving motor 10 is connected to the preheating adjustment... The screw 50 is coaxially installed, and the preheating adjustment screw 50 is threaded with a moving block 11. A U-shaped plate 12 is slidably installed on the slide rail 38. The moving block 11 and the U-shaped plate 12 are fixedly installed. An L-shaped plate 13 is installed on the upper end of each of the two U-shaped plates 12. A rotating plate 14 is provided between the two L-shaped plates 13. A preheating plate 17 is fixed at both the upper and lower ends of the rotating plate 14. It should be noted that the two preheating plates 17 are arranged in a rotationally symmetrical manner about the center position of the rotating plate 14. An air chamber 15 is provided inside the rotating plate 14. It is worth mentioning that an air inlet pipe is embedded through the L-shaped plate 13. One end of the air inlet pipe is connected to the air chamber 15, and the other end of the air inlet pipe is connected to an external gas pipe.

[0030] In this invention, a fixing ring 16 is provided on the outer side of the air chamber 15. The fixing ring 16 is rotatably installed with the rotating plate 14. Both L-shaped plates 13 are fixedly connected to the fixing ring 16. An adjustment groove 26 is provided at the end of the preheating plate 17 away from the rotating plate 14. An adjustment screw 27 is rotatably installed in the adjustment groove 26. A threaded block 28 is threaded on the external thread of the adjustment screw 27. A flame head 29 is installed on the threaded block 28 and is connected to the air chamber 15. A transmission cavity 21 is provided in the rotating plate 14. A rotating shaft 22 is rotatably installed in the transmission cavity 21. An adjustment motor 23 is embedded in the rotating plate 14. The drive shaft of the adjustment motor 23 rotates through the rotation. The rotating plate 14 is coaxially mounted with the rotating shaft 22. A first pulley 24 is coaxially mounted on the outside of the rotating shaft 22. A second pulley 25 is coaxially mounted on the adjusting screw 27. The first pulley 24 and the second pulley 25 are connected by a synchronous belt drive. The preheating plate 17 is provided with a through hole matching the synchronous belt. The lower end of the L-shaped plate 13 is equipped with a preheating motor 18. The drive shaft of the preheating motor 18 rotates through the L-shaped plate 13 and is coaxially mounted with a first gear 19. A second gear 20 is rotatably mounted on the L-shaped plate 13. The rotating plate 14 is provided with an annular tooth groove that meshes with the second gear 20. The first gear 19 and the second gear 20 are meshed and connected.

[0031] Through the above technical features: the movable motor 10 drives two preheating adjustment screws 50 to rotate, the preheating adjustment screws 50 drive the movable block 11 to move, the movable block 11 drives the L-shaped plate 13 to move via the U-shaped plate 12, and the L-shaped plate 13 drives the preheating plate 17 to move until the preheating plate 17 moves between the lower casting mold 2 and the upper casting mold 3. At this time, the preheating motor 18 drives the rotating plate 14 to rotate via the first gear 19 and the second gear 20, the rotating plate 14 drives the preheating plate 17 to rotate, and the preheating plate 17 drives the flame head 29 to rotate. The movement of the movable motor 10, driven by the two preheating adjustment screws 50, causes the preheating plate 17 to rotate. 3 drives the rotating shaft 22 to rotate, the rotating shaft 22 drives the adjusting screw 27 to rotate, the adjusting screw 27 drives the threaded block 28 to move, the threaded block 28 drives the flame head 29 to move, until the inner sides of the lower casting mold 2 and the upper casting mold 3 are preheated in all directions through the two flame heads 29, which improves the preheating efficiency of the mold. Moreover, since the upper casting mold 3 is above the lower casting mold 2, the heat dissipated by the lower casting mold 2 and the upper casting mold 3 can only be dissipated from the edges of the lower casting mold 2 and the upper casting mold 3. Less heat is dissipated during preheating, reducing energy waste.

[0032] To assemble the two upper casting molds 3 with the two lower casting molds 2, a lifting mechanism 5 is provided. The lifting mechanism 5 includes two grooves 30 within the frame 1, each groove 30 containing a rotatable lifting screw 31. One end of each lifting screw 31 rotatably passes through the frame 1 and is connected via a lifting transmission mechanism 32. The lifting transmission mechanism 32 includes two lifting pulleys 33, each coaxially mounted with one of the two lifting screws 31. The two pulleys 33 are connected via a synchronous belt. A horizontal plate 35 is slidably mounted on the frame 1, and both lifting screws 31 are threaded through the horizontal plate 35. A hoisting motor 34 is installed outside the frame 1. The drive shaft of the hoisting motor 34 is coaxially mounted with the hoisting screw 31. Two take-up rollers 36 are provided above the horizontal plate 35. The take-up rollers 36 are rotatably mounted to the horizontal plate 35 via the mounting plate 41. Both take-up rollers 36 are coaxially mounted with take-up pulleys 37. The two take-up pulleys 37 are connected by a synchronous belt drive. A take-up motor 40 is installed outside the mounting plate 41. The drive shaft of the take-up motor 40 rotates through the mounting plate 41 and is coaxially mounted with the take-up rollers 36. A hoisting rope 39 is wound around the take-up rollers 36. The lower end of the hoisting rope 39 passes through the horizontal plate 35 and is connected to a hook. A hanging ring matching the hook is installed at the upper end of the upper casting mold 3.

[0033] Through the above technical features: the hook is connected to the hanging ring of the upper casting mold 3, the two lifting screws 31 are rotated by the lifting motor 34, the two lifting screws 31 move the horizontal plate 35, the horizontal plate 35 moves the lifting rope 39 and the winding roller 36 until they are above the lower casting mold 2, the two winding rollers 36 are rotated by the winding motor 40, and the winding rollers 36 wind up the lifting rope 39, so that the upper casting mold 3 can be opened and closed, which is relatively convenient.

[0034] To cool the mold, a cooling mechanism 6 is provided. The cooling mechanism 6 includes a cold oil tank 42 and a hot oil tank 43 mounted on the frame 1. It should be noted that the cold oil tank 42 and the hot oil tank 43 have large capacities. The cold oil tank 42 and the hot oil tank 43 are connected by a transmission pipe 44. Two cold oil delivery pipes 47 are connected to the cold oil tank 42, and two hot oil recovery pipes 45 are connected to the hot oil tank 43. Cooling oil channels 48 are provided inside both the lower casting mold 2 and the upper casting mold 3. The end of pipe 47 away from the cold oil tank 42 is split and connected to the cooling oil passages 48 in the two lower casting molds 2 and the two upper casting molds 3 respectively. The end of hot oil recovery pipe 45 away from the hot oil tank 43 is split and connected to the cooling oil passages 48 in the two lower casting molds 2 and the two upper casting molds 3 respectively. It is worth mentioning that a three-way valve 46 is installed at the split position of both cold oil delivery pipe 47 and hot oil recovery pipe 45. It should be noted that the three-way valve 46 can control the flow direction in the pipe.

[0035] Through the above technical features:

[0036] When a single mold is working, the cold oil in the cold oil tank 42 is introduced into the cooling oil channel 48 through the cold oil delivery pipe 47. After the cold oil takes away the heat, it is heated and introduced into the hot oil tank 43 through the hot oil recovery pipe 45. After the oil in the hot oil tank 43 is cooled, it is introduced into the cold oil tank 42 through the transmission pipe 44 to complete the cycle.

[0037] When the dual molds are working, the two molds are staggered and closed. The cold oil in the cold oil tank 42 is introduced into the cooling oil channel 48 in one mold through the cold oil delivery pipe 47. After the cold oil carries away the heat, it heats up and is introduced into the cold oil delivery pipe 47 in the other mold through the hot oil recovery pipe 45. The hot oil preheats the other mold, making full use of the residual heat from cooling, improving energy utilization and reducing energy waste.

[0038] Working principle:

[0039] 1) Preheat the mold:

[0040] The movable motor 10 drives two preheating adjustment screws 50 to rotate, which in turn drive the movable block 11 to move. The movable block 11 then drives the L-shaped plate 13 to move via the U-shaped plate 12, and the L-shaped plate 13 drives the preheating plate 17 to move until the preheating plate 17 is positioned between the lower casting mold 2 and the upper casting mold 3. At this point, the preheating motor 18 drives the rotating plate 14 to rotate via the first gear 19 and the second gear 20. The rotating plate 14 then drives the preheating plate 17 to rotate, and the preheating plate 17 drives the flame head 29 to rotate. The adjusting motor 23 then drives the rotating shaft. Rotating shaft 22 drives adjusting screw 27 to rotate, adjusting screw 27 drives threaded block 28 to move, threaded block 28 drives flame head 29 to move, until the inner sides of the lower casting mold 2 and upper casting mold 3 are preheated in all directions through the two flame heads 29, which improves the preheating efficiency of the mold. Moreover, since the upper casting mold 3 is above the lower casting mold 2, the heat dissipated by the lower casting mold 2 and upper casting mold 3 can only be dissipated from the edges of the lower casting mold 2 and upper casting mold 3, so less heat is dissipated during preheating, reducing energy waste.

[0041] 2) Cooling the mold:

[0042] When a single mold is working, the cold oil in the cold oil tank 42 is introduced into the cooling oil channel 48 through the cold oil delivery pipe 47. After the cold oil takes away the heat, it is heated and introduced into the hot oil tank 43 through the hot oil recovery pipe 45. After the oil in the hot oil tank 43 is cooled, it is introduced into the cold oil tank 42 through the transmission pipe 44 to complete the cycle.

[0043] When the dual molds are working, the two molds are staggered and closed. The cold oil in the cold oil tank 42 is introduced into the cooling oil channel 48 in one mold through the cold oil delivery pipe 47. After the cold oil carries away the heat, it heats up and is introduced into the cold oil delivery pipe 47 in the other mold through the hot oil recovery pipe 45. The hot oil preheats the other mold, making full use of the residual heat from cooling, improving energy utilization and reducing energy waste.

[0044] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this invention.

Claims

1. A casting apparatus for large castings, characterized in that: The system includes a frame (1), within which two lower casting molds (2) are installed. An upper casting mold (3) is mounted on the top of the lower casting molds (2). A preheating mechanism (4) for preheating the lower casting molds (2) and the upper casting mold (3) is provided within the frame (1). The preheating mechanism (4) includes two slide rails (38) fixedly installed with the frame (1). A preheating adjustment groove (49) is provided at the upper end of the slide rails (38). A preheating adjustment screw (50) is rotatably installed in the preheating adjustment groove (49). One end of each of the two preheating adjustment screws (50) rotatably passes through the slide rails (38) and the frame (1) and is connected by a preheating transmission mechanism (8). A moving motor (10) is installed outside the frame (1). The drive shaft of the mobile motor (10) is coaxially mounted with one of the preheating adjustment screws (50). The preheating adjustment screw (50) is threaded with a moving block (11). A U-shaped plate (12) is slidably mounted on the slide rail (38). The moving block (11) is fixedly mounted with the U-shaped plate (12). An L-shaped plate (13) is mounted on the upper end of each of the two U-shaped plates (12). A rotating plate (14) is provided between the two L-shaped plates (13). A preheating plate (17) is fixed at both the upper and lower ends of the rotating plate (14). The two preheating plates (17) are arranged in a rotationally symmetrical manner about the center position of the rotating plate (14). An air chamber (15) is provided inside the rotating plate (14). A fixing ring is provided on the outer side of the air chamber (15). (16) The fixed ring (16) and the rotating plate (14) are rotatably installed. Both L-shaped plates (13) are fixedly connected to the fixed ring (16). The preheating plate (17) is provided with an adjustment groove (26) at one end away from the rotating plate (14). An adjustment screw (27) is rotatably installed in the adjustment groove (26). A threaded block (28) is threaded on the external thread of the adjustment screw (27). A flame head (29) is installed on the threaded block (28). The flame head (29) is connected to the air chamber (15). A transmission chamber (21) is provided in the rotating plate (14). A rotating shaft (22) is rotatably installed in the transmission chamber (21). An adjustment motor (23) is embedded in the rotating plate (14). The adjustment motor (23) The drive shaft rotates through the rotating plate (14) and is coaxially mounted with the rotating shaft (22). A first pulley (24) is coaxially mounted on the outside of the rotating shaft (22). A second pulley (25) is coaxially mounted on the adjusting screw (27). The first pulley (24) and the second pulley (25) are connected by a synchronous belt drive. The preheating plate (17) has through holes that match the synchronous belt. A preheating motor (18) is mounted at the lower end of the L-shaped plate (13). The drive shaft of the preheating motor (18) rotates through the L-shaped plate (13) and is coaxially mounted with a first gear (19). A second gear (20) is rotatably mounted on the L-shaped plate (13). The rotating plate (14) has an annular tooth groove that meshes with the second gear (20).The first gear (19) meshes with the second gear (20). The frame (1) is equipped with a hoisting mechanism (5) for hoisting the upper casting mold (3). The frame (1) is also equipped with a cooling mechanism (6) for cooling the lower casting mold (2) and the upper casting mold (3). A liquid injection port (7) is installed at the upper end of the upper casting mold (3).

2. The casting apparatus for large castings according to claim 1, characterized in that: The preheating transmission mechanism (8) includes two preheating wheels (9), which are coaxially mounted with two preheating adjusting screws (50) respectively, and are connected to each other by a synchronous belt drive.

3. The casting apparatus for large castings according to claim 1, characterized in that: The hoisting mechanism (5) includes two grooves (30) set in the frame (1). Hoisting screws (31) are rotatably installed in both grooves (30). One end of each hoisting screw (31) rotatably passes through the frame (1) and is connected by a hoisting transmission mechanism (32). A horizontal plate (35) is slidably installed on the frame (1). Both hoisting screws (31) are threaded through the horizontal plate (35). A hoisting motor (34) is installed outside the frame (1). The drive shaft of the hoisting motor (34) is coaxially installed with one of the hoisting screws (31). Two take-up rollers (36) are provided above the horizontal plate (35). The take-up roller (36) is rotatably mounted on the horizontal plate (35) via the mounting plate (41). Both take-up rollers (36) are coaxially mounted with take-up pulleys (37). The two take-up pulleys (37) are connected by a synchronous belt drive. A take-up motor (40) is mounted outside the mounting plate (41). The drive shaft of the take-up motor (40) rotates through the mounting plate (41) and is coaxially mounted with one of the take-up rollers (36). A hanging rope (39) is wound around the outside of the take-up roller (36). The lower end of the hanging rope (39) passes through the horizontal plate (35) and is connected to a hook. A hanging ring matching the hook is installed on the upper end of the upper casting mold (3).

4. The casting apparatus for large castings according to claim 3, characterized in that: The hoisting transmission mechanism (32) includes two hoisting pulleys (33), which are coaxially mounted with two hoisting screws (31) respectively, and are connected to each other by a synchronous belt drive.

5. The casting apparatus for large castings according to claim 1, characterized in that: The cooling mechanism (6) includes a cold oil tank (42) and a hot oil tank (43) installed on the frame (1). The cold oil tank (42) and the hot oil tank (43) are connected by a transmission pipe (44). Two cold oil delivery pipes (47) are connected to the cold oil tank (42), and two hot oil recovery pipes (45) are connected to the hot oil tank (43). Cooling oil channels (48) are provided in both the lower casting mold (2) and the upper casting mold (3). The ends of the two cold oil delivery pipes (47) away from the cold oil tank (42) are split and connected to the cooling oil channels (48) in the two lower casting molds (2) and the two upper casting molds (3) respectively. The ends of the hot oil recovery pipes (45) away from the hot oil tank (43) are split and connected to the cooling oil channels (48) in the two lower casting molds (2) and the two upper casting molds (3) respectively.

6. The casting apparatus for large castings according to claim 5, characterized in that: A three-way valve (46) is installed at the branching point of both the cold oil delivery pipe (47) and the hot oil recovery pipe (45).

7. The casting apparatus for large castings according to claim 1, characterized in that: An air inlet pipe is embedded through the L-shaped plate (13). One end of the air inlet pipe is connected to the air chamber (15), and the other end of the air inlet pipe is connected to the external gas pipe.

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