A casting device for spheroidal graphite cast iron

Abstract

The application discloses a nodular cast iron pouring device, which comprises a base table, a top die cylinder embedded in the top of the base table, a pouring mechanism arranged on the ear part of the base table, a piston ring arranged in the die cavity of the die cylinder, and cast liquid poured by the pouring mechanism falling on the top of the piston ring; the pouring device further comprises a transmission part, and the piston ring gradually falls to the bottom of the die cavity through the transmission of the transmission part during pouring, so that the die cavity is emptied and the cast liquid fills the die cavity without mixing with air; the transmission part comprises a middle core column slidingly inserted into the bottom wall of the die cylinder, a bumping mechanism is arranged on the outer wall of the middle core column and the inner wall of the die cylinder, and the middle core column bumps and vibrates the inner wall of the die cylinder through the bumping mechanism when the middle core column synchronously ascends and descends with the piston ring, so that the air contained in the cast liquid in the die cavity is further eliminated, and the quality of the nodular cast iron short pipe formed through pouring is better.

Description

Technical Field

[0001] This invention belongs to the field of casting equipment technology, and particularly relates to a casting equipment for ductile iron. Background Technology

[0002] Ductile iron, a high-strength cast iron material developed in the 1950s, boasts comprehensive properties approaching those of steel. Based on its superior performance, it has been successfully used to cast parts subject to complex stresses and requiring high strength, toughness, and wear resistance. Ductile iron has rapidly become the second most widely used cast iron material after gray cast iron. The concept of "replacing steel with iron" primarily refers to ductile iron. Ductile iron is produced through spheroidizing and inoculation treatment to obtain spheroidal graphite, effectively improving the mechanical properties of cast iron, particularly its plasticity and toughness, resulting in strength even higher than carbon steel.

[0003] Among them, ductile iron short pipes are common and frequently used ductile iron parts. Due to their tubular structural characteristics, the mold cavity in the mold has not only a small inner diameter but also a certain depth. During the top-down casting process, the molten iron impacts the bottom of the mold cavity from a high place. The air in the mold cavity does not have time to escape quickly and is therefore easily mixed into the molten iron in the mold cavity. This results in larger pores inside the cast ductile iron short pipe, affecting the quality of the cast ductile iron short pipe. Summary of the Invention

[0004] To address the problems in the prior art, the present invention proposes the following technical solution:

[0005] A casting device for ductile iron includes a base platform, a mold cylinder with its top flush with the base platform is embedded in the top of the base platform, a casting mechanism is provided in the lug of the base platform, a piston ring is provided in the mold cavity of the mold cylinder, and the molten casting poured by the casting mechanism falls onto the top of the piston ring.

[0006] The casting device also includes a transmission component. During casting, the piston ring is gradually lowered to the bottom of the mold cavity by the transmission component, thus venting the air in the mold cavity and preventing the molten casting from mixing with air and filling the mold cavity.

[0007] The transmission component includes a central core column that is slidably inserted into the bottom wall of the mold cylinder. The outer wall of the central core column and the inner wall of the mold cylinder are jointly provided with a vibration mechanism. When the central core column moves up and down synchronously with the piston ring component, it collides and vibrates the inner wall of the mold cylinder through the vibration mechanism, thereby further eliminating the air contained in the casting liquid in the mold cavity.

[0008] As a preferred embodiment of the above technical solution, an exhaust hole is provided at the bottom of the mold cavity, and the piston ring is lowered to its lowest point to cover the exhaust hole.

[0009] As a preferred embodiment of the above technical solution, the vibration mechanism includes a convex cavity, a convex block, a spring, a first impact ball, and a second impact ball;

[0010] The cavity is formed on the inner wall of the mold cylinder. The protrusion is located in the cavity and is adapted to the cavity. The first ball is fixed on the top of the protrusion and the diameter of the first ball is smaller than the inner diameter of the top of the cavity. The second ball is located on the outer wall of the central core. The spring connects the bottom of the protrusion and the bottom of the cavity.

[0011] As a preferred embodiment of the above technical solution, the plurality of first contact balls on the inner wall of the mold cylinder and the plurality of second contact balls on the outer wall of the central core are equidistantly arranged, and the spacing between the first contact balls and the spacing between the second contact balls are in a non-integer multiple relationship.

[0012] As a preferred embodiment of the above technical solution, the casting mechanism includes a drive assembly and a tilting casting assembly;

[0013] The drive assembly includes a motor mounted on the base platform, and the output shaft of the motor is fixedly connected to a drive gear.

[0014] As a preferred embodiment of the above technical solution, the flipping casting assembly includes a rotating rod that is rotatably inserted between the lugs. One end of the rotating rod is fixedly connected to a transmission gear that meshes with the drive gear. An L-shaped carrier plate is fixedly sleeved around the rotating rod, and the rotating rod is inserted at the corner of the L-shaped carrier plate. A casting cylinder is detachably fixed on the L-shaped carrier plate.

[0015] As a preferred embodiment of the above technical solution, a cylinder is fixedly connected to the back of the L-shaped carrier plate, a connecting plate is fixedly connected to the telescopic end of the cylinder, and multiple bent clamps are fixedly connected to the top of the connecting plate.

[0016] The casting cylinder is integrally provided with a retaining sleeve on its outer periphery. The bent retaining rod descends and fastens the retaining sleeve to fix the casting cylinder. The L-shaped carrier plate is provided with a limit strip to limit and abut against the retaining sleeve.

[0017] As a preferred embodiment of the above technical solution, the transmission component includes a toothed plate that is slidably connected to the front of the base platform, and the toothed plate and the transmission gear plate mesh with each other for transmission. The bottom end of the toothed plate and the bottom end of the central core are connected by a fixed bent rod.

[0018] The bottom of the central core column has a hollow cavity. A bottom ring is fixedly connected to the lower edge of the hollow cavity. A sliding plate is slidably connected to the inner wall of the hollow cavity. A bent connecting rod is fixedly connected to the bottom of the sliding plate. The other end of the bent connecting rod passes through the exhaust hole and is fixed to the bottom of the piston ring.

[0019] As a preferred embodiment of the above technical solution, the bottom of the base platform is provided with a bottom cavity, and the bottom cavity is located directly below the central core column and the bent connecting rod.

[0020] As a preferred embodiment of the above technical solution, a liquid guiding cap is provided at the top of the mold cylinder. The liquid guiding cap includes an outer ring and a liquid guiding component, and a cylindrical connector is fixedly connected between the outer ring and the liquid guiding component.

[0021] The outer ring is bowl-shaped, and the liquid guiding component is cone-shaped. The bottoms of the outer ring and the liquid guiding component extend downward to form a cylindrical structure that matches the top of the mold cavity.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. A piston ring is installed inside the mold cavity of the mold cylinder. The piston ring is located near the top of the mold cavity and has a certain height difference with the top of the mold cavity, thus forming a shallow new casting cavity. When the molten metal is poured from top to bottom, the shallow depth of the new casting cavity makes it easier for air to escape, thereby reducing the amount of air mixed into the molten metal. During the casting process, the piston ring is gradually lowered to the bottom of the mold cavity by the transmission component. As the casting process continues, the amount of molten metal increases and the piston ring gradually descends. Although the depth of the new casting cavity is constantly increasing, the actual height of the top liquid level of the molten metal does not change significantly due to the increase in the amount of molten metal. This keeps the amount of air mixed into the molten metal low. At the same time, the descent of the piston ring continuously discharges the air below the piston ring in the mold cavity, preventing it from mixing into the molten metal, thus reducing the amount of air mixed into the molten metal.

[0024] 2. The transmission component includes a central core column that is slidably inserted into the bottom wall of the mold cylinder. The outer wall of the central core column and the inner wall of the mold cylinder are jointly provided with a vibration collision mechanism. When the central core column moves up and down synchronously with the piston ring component, it collides and vibrates the inner wall of the mold cylinder through the vibration collision mechanism. Under the action of the collision, the air mixed in the casting liquid can be discharged in an auxiliary manner, thereby further reducing the air mixed in the casting liquid.

[0025] 3. When the casting device of the present invention removes the cast ductile iron from the mold cavity, the motor first drives the L-shaped carrier plate and the casting cylinder back to the initial position in reverse. Initially, the central core column moves upward a short distance under the connection of the toothed plate and the fixed bent rod. During this process, the sliding plate, the bent connecting rod, and the piston ring remain stationary. During the upward movement of the central core column, it can collide and vibrate the inner wall of the mold cylinder under the action of the vibration mechanism, thereby assisting the ductile iron to be demolded. Then, the top of the bottom ring abuts against the bottom of the sliding plate and continues to move upward, thereby driving the piston ring to push the ductile iron upward. Attached Figure Description

[0026] Figure 1 The diagram shown is a top-view three-dimensional structural schematic of the casting device of the present invention;

[0027] Figure 2 The diagram shown is a schematic diagram of the mold cylinder structure in the casting device of the present invention;

[0028] Figure 3 The figure shown is a vertical cross-sectional view of the casting device of the present invention along line aa;

[0029] Figure 4 What is shown is Figure 3 Enlarged view of point A in the middle;

[0030] Figure 5 The diagram shown is a bottom-view three-dimensional structural schematic of the casting device of the present invention;

[0031] Figure 6 The figure shown is a vertical cross-sectional view of the mold cylinder along bb in the casting device of the present invention;

[0032] Figure 7 The diagram shown is a schematic of the liquid guide cap structure in the casting device of the present invention.

[0033] Figure Labels

[0034] 10. Base platform; 11. Platform lugs; 12. Bottom cavity; 20. Mold cylinder; 21. Mold cavity; 22. Limiting block; 30. Casting mechanism; 31. L-shaped carrier plate; 32. Casting cylinder; 321. Sleeve part; 33. Drive gear plate; 34. Transmission gear plate; 35. Motor; 36. Rotating rod; 37. Cylinder; 38. Connecting plate; 39. Bent clamping rod; 310. Limiting strip; 40. Transmission... Moving part; 41. Toothed plate; 42. Fixed bent rod; 43. Central core column; 44. Bending connecting rod; 45. Sliding plate; 46. Bottom ring; 47. Hollow bottom cavity; 50. Liquid guide cap; 51. Outer ring; 52. Liquid guide; 53. Cylindrical connector; 60. Piston ring; 70. Vibration mechanism; 71. Protruding cavity; 72. Protrusion; 73. Spring; 74. First contact ball; 75. Second contact ball. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0036] Example

[0037] like Figure 1 , Figure 2 As shown

[0038] Includes a base platform 10, with a mold cylinder 20 embedded in the top of the base platform 10, such as... Figure 4 The outer wall of the mold cavity 21 is integrally fixedly connected to the limiting block 22. The top of the base 10 is provided with a groove that matches the limiting block 22. The limiting block 22 is placed in the groove so that the mold cylinder 20 maintains a fixed position and overall stability.

[0039] The base 10 has a casting mechanism 30 on its lug 11. The mold cavity 21 of the mold cylinder 20 has a piston ring 60. The piston ring 60 is located near the top of the mold cavity 21 and has a certain height difference with the top of the mold cavity 21, thus forming a shallow new casting cavity between it and the mold cavity 21. When the molten casting is poured from top to bottom, the air in the new casting cavity is more likely to overflow during casting because the new casting cavity is shallow, thereby reducing the amount of air mixed in with the molten casting.

[0040] The casting device also includes a transmission component 40. During casting, the piston ring 60 gradually descends to the bottom of the mold cavity 21 through the transmission component 40. As the casting mechanism 30 continuously casts, the amount of molten metal increases, and the piston ring 60 gradually descends. Although the depth of the newly cast cavity is constantly increasing, the actual height of the top liquid level of the molten metal does not change significantly due to the increase in molten metal. This keeps the amount of air mixed in the molten metal low. At the same time, the descent of the piston ring 60 will continuously expel the air below the piston ring 60 in the mold cavity 21, preventing it from mixing into the molten metal, thereby reducing the amount of air mixed in the molten metal. The bottom of the mold cavity 21 is provided with an exhaust hole, and the piston ring 60 descends to its lowest point and covers the exhaust hole.

[0041] like Figure 3 , Figure 4 As shown

[0042] The transmission component 40 includes a central core column 43 that is slidably inserted into the bottom wall of the mold cylinder 20. The outer wall of the central core column 43 and the inner wall of the mold cylinder 20 are jointly provided with a vibration mechanism 70. When the central core column 43 moves up and down synchronously with the piston ring component 60, it collides and vibrates the inner wall of the mold cylinder 20 through the vibration mechanism 70. Under the action of the collision, the air mixed in the casting liquid can be discharged in an auxiliary manner, thereby further reducing the air mixed in the casting liquid.

[0043] The vibration mechanism 70 includes a cavity 71, a protrusion 72, a spring 73, a first contact ball 74, and a second contact ball 75;

[0044] A cavity 71 is formed on the inner wall of the mold cylinder 20. A protrusion 72 is located in the cavity 71 and is adapted to the cavity 71. A first ball bearing 74 is fixed on the top of the protrusion 72, and the diameter of the first ball bearing 74 is smaller than the inner diameter of the top of the cavity 71. A second ball bearing 75 is located on the outer wall of the central core 43. A spring 73 connects the bottom of the protrusion 72 and the bottom of the cavity 71.

[0045] The working principle of the vibration mechanism 70 is as follows: When the first ball 74 and the second ball 75 are not colliding, the spring 73 forces the protrusion 72 and the first ball 74 to extend outward. During the lifting and lowering of the central column 43, the second ball 75 rises and falls synchronously, so that the second ball 75 and the first ball 74 come into contact and collide. The vibration generated by the contact and collision is transmitted to the mold cylinder 20, and then to the casting liquid in the mold cavity 21 through the mold cylinder 20, so as to help vibrate and expel the air mixed in the casting liquid. The collision contact surface of the first ball 74 and the second ball 75 is an arc surface, which forces the first ball 74 and the protrusion 72 to retract into the protrusion cavity 71 until the second ball 75 passes through. After the second ball 75 passes through, it extends outward again under the action of the spring 73 and collides with the next second ball 75, and so on.

[0046] The multiple first contact balls 74 on the inner wall of the mold cylinder 20 and the multiple second contact balls 75 on the outer wall of the central core column 43 are all equidistantly arranged, and the spacing between the first contact balls 74 and the spacing between the second contact balls 75 is not an integer multiple. This arrangement of the number and spacing can achieve uninterrupted collision between the first contact balls 74 and the second contact balls 75. In this embodiment, there are four sets of first contact balls 74 arranged vertically and five sets of second contact balls 75 arranged vertically.

[0047] like Figure 3 , Figure 5 As shown

[0048] The casting mechanism 30 includes a drive assembly and a tilting casting assembly;

[0049] The drive assembly includes a motor 35 mounted on the base 10, and the output shaft of the motor 35 is fixedly connected to a drive gear 33; the flip casting assembly includes a rotating rod 36 rotatably inserted between the lugs 11, one end of the rotating rod 36 is fixedly connected to a transmission gear 34 that meshes with the drive gear 33, an L-shaped carrier plate 31 is fixedly sleeved around the rotating rod 36, and the rotating rod 36 is inserted at the corner of the L-shaped carrier plate 31, and a casting cylinder 32 is detachably fixed on the L-shaped carrier plate 31;

[0050] The working principle of the casting mechanism 30 is as follows: the motor 35 drives the drive gear 33 to rotate, the drive gear 33 meshes and drives the transmission gear 34 to rotate, the transmission gear 34 rotates and drives the rotating rod 36 to rotate, thereby driving the L-shaped carrier plate 31 and the casting cylinder 32 to rotate around the rotating rod 36, so that the casting liquid inside the casting cylinder 32 can be poured downward.

[0051] A cylinder 37 is fixedly connected to the back of the L-shaped carrier plate 31. A connecting plate 38 is fixedly connected to the telescopic end of the cylinder 37. Multiple bent clamping rods 39 are fixedly connected to the top of the connecting plate 38. A clamping sleeve 321 is integrally provided on the periphery of the casting cylinder 32. The bent clamping rods 39 descend and fasten the clamping sleeve 321 to fix the casting cylinder 32. A limit strip 310 is provided on the L-shaped carrier plate 31 to limit and abut against the clamping sleeve 321. When installing the casting cylinder 32, if... Figure 3 As shown, the casting cylinder 32 is first placed back-to-back on the L-shaped carrier plate 31. The limiting strip 310 limits the casting cylinder 32. Then, the cylinder 37 operates to drive the connecting plate 38 and the bent clamping rod 39 to descend. The bent clamping rod 39 is engaged in the clamping sleeve 321, thereby completing the limiting and fixing of the casting cylinder 32. At the same time, when it is necessary to disassemble the casting cylinder 32, it is only necessary to reverse the operation. This facilitates the installation and disassembly of the casting cylinder 32, thereby facilitating the cleaning of residual casting liquid inside.

[0052] like Figure 5 , Figure 6 As shown

[0053] The transmission component 40 includes a toothed plate 41 that is slidably connected to the front of the base 10, and the toothed plate 41 and the transmission gear 34 mesh with each other for transmission. The bottom end of the toothed plate 41 and the bottom end of the central core column 43 are connected by a fixed bent rod 42. A hollow bottom cavity 47 is opened at the bottom of the central core column 43. A bottom ring 46 is fixedly connected to the lower edge of the hollow bottom cavity 47. A sliding plate 45 is slidably connected to the inner wall of the hollow bottom cavity 47. A bent connecting rod 44 is fixedly connected to the bottom of the sliding plate 45. The other end of the bent connecting rod 44 passes through the exhaust hole and is fixed to the bottom of the piston ring component 60.

[0054] The working principle of the transmission component 40 is as follows: When the casting mechanism 30 is casting, the transmission gear 34 rotates. Under the meshing action of the transmission gear 34 and the gear plate 41, the gear plate 41 is driven to descend. Under the connection of the fixed bent rod 42, the central core column 43 is driven to descend. Since there is a certain resistance between 61 and the inner wall of the mold cavity 21, the piston ring 60, the bent connecting rod 44, and the sliding plate 45 are located in the hollow bottom cavity 47. After the central core column 43 descends a short distance, the top of the hollow bottom cavity 47 presses against the sliding plate 45 and drives it to descend. The actual effect is: the casting cylinder 32 is tilted at a certain angle. When the casting liquid begins to fall to the top of the piston ring 60, the piston ring 60 begins to descend. Then, as the casting liquid is continuously poured, the piston ring 60 continues to descend to the bottom of the mold cavity 21.

[0055] It should be noted that when the casting device of the present invention removes the cast ductile iron from the mold cavity 21, the motor 35 first drives the L-shaped carrier plate 31 and the casting cylinder 32 back to the initial position in reverse. Initially, under the connection of the toothed plate 41 and the fixed bent rod 42, the central core column 43 is driven to move upward a short distance. During this process, the sliding plate 45, the bent connecting rod 44, and the piston ring 60 remain stationary. During the upward movement of the central core column 43, it can collide and vibrate the inner wall of the mold cylinder 20 under the action of the vibration mechanism 70, thereby assisting the ductile iron to be demolded. Then, the top of the bottom ring 46 abuts against the bottom of the sliding plate 45 and continues to move upward, thereby driving the piston ring 60 to push the ductile iron upward.

[0056] like Figure 5 As shown, a bottom cavity 12 is provided at the bottom of the base platform 10, and the bottom cavity 12 is located directly below the central core column 43 and the bent connecting rod 44; by providing the bottom cavity 12, the downward movement of the central core column 43 and the bent connecting rod 44 is not obstructed.

[0057] like Figure 7 As shown

[0058] A liquid guiding cap 50 is provided at the top of the mold cylinder 20. The liquid guiding cap 50 includes an outer ring 51 and a liquid guiding component 52, and a cylindrical connector 53 is fixedly connected between the outer ring 51 and the liquid guiding component 52. The outer ring 51 is bowl-shaped, which can better receive the molten casting poured from the casting cylinder 32 and prevent it from spilling outwards. The liquid guiding component 52 is cone-shaped. The cone-shaped liquid guiding component 52, together with the outer ring 51, can not only guide the molten casting to flow accurately into the mold cavity 21, but also reduce splashing of the molten casting when it is poured onto the cone-shaped curved surface of the liquid guiding component 52, thereby further reducing the mixing of air into the molten casting. Figure 4 As shown, the bottom of the outer ring 51 and the liquid guiding part 52 extends downward to form a cylindrical structure and matches the top of the mold cavity 21, so that the liquid guiding cap 50 can be locked on the top of the mold cylinder 20.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A casting apparatus for spheroidal graphite cast iron, comprising a base table (10) in which a mold cylinder (20) flush with the top of the base table (10) is embedded, characterized in that, The base (10) has a casting mechanism (30) on its lug (11), and a piston ring (60) is provided in the mold cavity (21) of the mold cylinder (20). The casting liquid poured by the casting mechanism (30) falls to the top of the piston ring (60). The casting device also includes a transmission component (40). When the casting mechanism (30) is casting, the piston ring component (60) is gradually lowered to the bottom of the mold cavity (21) by the transmission of the transmission component (40), so that the air in the mold cavity (21) is emptied and the casting liquid does not mix with air to fill the mold cavity (21). The transmission component (40) includes a central core column (43) that is slidably inserted into the bottom wall of the mold cylinder (20). The outer wall of the central core column (43) and the inner wall of the mold cylinder (20) are jointly provided with a vibration-collision mechanism (70). When the central core column (43) moves up and down synchronously with the piston ring component (60), it collides and vibrates the inner wall of the mold cylinder (20) through the vibration-collision mechanism (70), thereby further eliminating the presence of impurities in the casting liquid in the mold cavity (21). The air; The bottom of the mold cavity (21) is provided with an exhaust hole, and the piston ring (60) is lowered to the lowest part to cover the exhaust hole; The transmission component (40) includes a toothed plate (41) that is slidably connected to the front of the base (10), and the toothed plate (41) and the transmission gear (34) mesh and transmit power. The bottom end of the toothed plate (41) and the bottom end of the central core column (43) are connected by a fixed bent rod (42). The bottom of the central core column (43) is provided with a hollow bottom cavity (47), and a bottom ring (46) is fixedly connected to the lower edge of the hollow bottom cavity (47). A sliding plate (45) is slidably connected to the inner wall of the hollow bottom cavity (47). A bent connecting rod (44) is fixedly connected to the bottom of the sliding plate (45). The other end of the bent connecting rod (44) passes through the exhaust hole and is fixed to the bottom of the piston ring (60). The bottom of the base (10) is provided with a bottom cavity (12), and the bottom cavity (12) is located directly below the central core column (43) and the bent connecting rod (44).

2. The casting apparatus of nodular cast iron according to claim 1, characterized by The vibration mechanism (70) includes a cavity (71), a protrusion (72), a spring (73), a first ball (74), and a second ball (75); A cavity (71) is formed on the inner wall of the mold cylinder (20). A protrusion (72) is located in the cavity (71) and is adapted to the cavity (71). A first ball (74) is fixed on the top of the protrusion (72), and the diameter of the first ball (74) is smaller than the inner diameter of the top of the cavity (71). A second ball (75) is located on the outer wall of the central core (43). A spring (73) connects the bottom of the protrusion (72) and the bottom of the cavity (71).

3. The device for casting of spherulitic cast iron according to claim 2, characterized in that, The multiple first contact balls (74) on the inner wall of the mold cylinder (20) and the multiple second contact balls (75) on the outer wall of the central core column (43) are all equidistantly arranged, and the distance between the first contact balls (74) and the distance between the second contact balls (75) is a non-integer multiple relationship.

4. The device for casting of spherulitic cast iron according to claim 1, characterized in that, The casting mechanism (30) includes a drive assembly and a tilting casting assembly; The drive assembly includes a motor (35) mounted on a base (10), and the output shaft of the motor (35) is fixedly connected to a drive gear (33).

5. The device for casting of spherulitic cast iron according to claim 4, characterized in that, The flip casting assembly includes a rotating rod (36) rotatably inserted between the lugs (11). One end of the rotating rod (36) is fixedly connected to a transmission gear (34) that meshes with the drive gear (33). An L-shaped carrier plate (31) is fixedly sleeved around the rotating rod (36), and the rotating rod (36) is inserted into the corner of the L-shaped carrier plate (31). A casting cylinder (32) is detachably fixed on the L-shaped carrier plate (31).

6. The device for casting of spherulitic cast iron according to claim 5, characterized in that, A cylinder (37) is fixedly connected to the back of the L-shaped carrier plate (31), a connecting plate (38) is fixedly connected to the telescopic end of the cylinder (37), and a plurality of bent clamps (39) are fixedly connected to the top of the connecting plate (38). The casting cylinder (32) is integrally provided with a sleeve part (321) on its periphery. The bent clamping rod (39) descends and hooks the sleeve part (321) to fix the casting cylinder (32). The L-shaped carrier plate (31) is provided with a limit strip (310) to limit and abut against the sleeve part (321).

7. The device for casting ductile iron according to claim 1, wherein The top of the mold cylinder (20) is provided with a liquid guiding cap (50), which includes an outer ring (51) and a liquid guiding component (52). A cylindrical connector (53) is fixedly connected between the outer ring (51) and the liquid guiding component (52). The outer ring (51) is bowl-shaped, and the liquid guiding component (52) is cone-shaped. The bottom of the outer ring (51) and the liquid guiding component (52) extends downward to form a cylindrical structure and matches the top of the mold cavity (21).

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