Low-temperature high-toughness nodular cast iron production process

Abstract

The invention discloses a low-temperature high-toughness nodular cast iron production process, and relates to the technical field of nodular cast iron production. According to the low-temperature high-toughness nodular cast iron production process, through cooperation of an external protection barrel and a storage barrel, the pouring safety can be effectively improved, meanwhile, through cooperation of an auxiliary discharging frame, in the pouring process, the pouring operation of molten iron can be completed through the auxiliary discharging frame, and along with operation of a pushing cylinder body, the working efficiency is improved. And the corresponding telescopic sleeve rods can be pushed to slide in the rectangular limiting frame, so that the telescopic sleeve rods can drive the auxiliary discharging frame to complete deflection while stretching out and drawing back, adjustment of the pouring angle is achieved, and the pouring stability is effectively improved while the pouring range is increased.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron production, in particular to a low-temperature high-toughness ductile iron production process. Background Art

[0002] Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some parts with complex forces and high requirements for strength, toughness and wear resistance. Ductile iron has rapidly developed into a widely used cast iron material second only to gray cast iron. The so-called "iron instead of steel" mainly refers to ductile iron; refer to the Chinese patent, "Casting Equipment for Low-Temperature and High-Toughness Ductile Iron Production" with the announcement number "CN115592105A", which points out that the existing casting device has the problem of easy shaking of the pouring ladle during the casting process; but the equipment still has the problem of poor casting safety. In response to this, we propose a low-temperature and high-toughness ductile iron production process to solve the above problem. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a low-temperature high-toughness ductile iron production process, which solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented by the following technical scheme: A low-temperature high-toughness ductile iron production process, characterized in that it specifically includes the following steps:

[0005] S1, pouring the raw materials into the smelting furnace in sequence for smelting to obtain molten iron, and then performing slag removal on the molten iron after standing;

[0006] S2, spheroidizing the molten iron, and then pouring the spheroidized molten iron into a casting device;

[0007] S3, pouring molten iron into the mold through a pouring device to obtain a casting;

[0008] The pouring equipment in S2 includes a positioning frame, a bottom base plate is fixed at the bottom of the positioning frame for placing the mold, driving frames are provided on both sides of the interior of the positioning frame, and a driving shaft is installed inside the driving frame, an external protective cylinder is rotatably installed below the driving shaft, and a storage cylinder is fixed inside the external protective cylinder, a positioning plate frame is fixedly installed outside the driving shaft, and a transmission cylinder is connected between the positioning plate frame and the external protective cylinder for driving the external protective cylinder and the storage cylinder to rotate;

[0009] A discharge pipe is fixedly installed outside the storage cylinder, and the discharge pipe passes through the external protective cylinder to pour the molten iron into the mold;

[0010] An auxiliary unloading rack is provided on the outside of the discharge pipe, and rectangular limit racks are fixed on both sides of the auxiliary unloading rack, and telescopic sleeves are slidably installed inside the rectangular limit racks. An adjusting cylinder is fixedly installed between the telescopic sleeves and the driving shaft rod, which is used to adjust the distance between the auxiliary unloading rack and the discharge pipe when the storage cylinder is tilted.

[0011] Preferably, a pushing cylinder is fixedly installed at the bottom of the rectangular limit frame, and the piston end of the pushing cylinder penetrates into the interior of the rectangular limit frame and is fixedly connected to the telescopic sleeve, which is used to drive the telescopic sleeve to slide up and down inside the rectangular limit frame to achieve adjustment of the casting angle of the auxiliary unloading frame.

[0012] Preferably, a positioning ring frame is fixedly mounted on the end of the adjusting cylinder body, and the positioning ring frame is fixedly sleeved on the outer side of the driving shaft.

[0013] Preferably, the outer protective tube and the storage tube always remain coaxial, and the outer protective tube and the storage tube are fixedly connected as one body by a plurality of bolts.

[0014] Preferably, both ends of the driving shaft are rotatably sleeved with transmission gears for driving the driving shaft to translate along the installation direction of the driving frame as the driving frame runs.

[0015] Preferably, a conical lower hopper is fixedly mounted on the top surface of the positioning frame, and a feeding pipe matched with the conical lower hopper is fixedly mounted on the top surface of the external protective cylinder for pouring the spheroidized molten iron into the storage cylinder.

[0016] Preferably, a heating plate is fixedly installed inside the external protective tube and inside the auxiliary unloading rack.

[0017] Preferably, a sealing bottom plate is slidably mounted on the end of the auxiliary unloading rack, and a unloading cylinder is fixedly mounted on the outer side of the end of the auxiliary unloading rack, and the unloading cylinder is used to drive the sealing bottom plate to slide back and forth at the end of the auxiliary unloading rack.

[0018] Preferably, a plurality of sliding rods are fixedly mounted on the end of the auxiliary unloading rack, and the sliding rods penetrate the auxiliary unloading rack and are slidably connected thereto.

[0019] Preferably, the discharge pipe is installed obliquely and is slidably connected with a blocking end head inside, a discharge hole is opened inside the blocking end head, and a counterweight ball is fixedly installed at the end of the blocking end head.

[0020] The present invention provides a low-temperature high-toughness ductile iron production process. Compared with the prior art, it has the following beneficial effects:

[0021] (1) The low-temperature high-toughness ductile iron production process can effectively improve the pouring safety through the cooperation of the external protective tube and the storage tube. At the same time, through the cooperation of the auxiliary unloading rack, the pouring operation of the molten iron can be completed through the auxiliary unloading rack during the pouring process. As the pushing cylinder runs, the corresponding telescopic sleeve can be pushed to slide inside the rectangular limit frame, so that the telescopic sleeve can be extended and retracted while driving the auxiliary unloading rack to complete the deflection, thereby realizing the adjustment of the pouring angle, increasing the pouring range and effectively improving the pouring stability.

[0022] (2) The low-temperature high-toughness ductile iron production process can complete the sealing of the auxiliary unloading rack after the pouring is completed by setting a sealing bottom plate to avoid the dripping of molten iron. At the same time, through the cooperation of the sealing end, during the pouring process, as the discharge pipe is tilted, the sealing end can be forced to slide toward one end of the counterweight ball, so that the molten iron can be discharged through the discharge hole. When the discharge pipe 14 is reset, the sealing end can cooperate with the counterweight ball to re-seal the discharge pipe, further ensuring the safety of the operation and the pouring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic cross-sectional view of the positioning frame of the present invention;

[0025] Figure 3 For the present invention Figure 2 Look at the structural diagram;

[0026] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0027] Figure 5 This is a schematic diagram of the structure of the external protective tube and the positioning plate frame of the present invention;

[0028] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the external protection tube and the storage tube of the present invention;

[0030] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C in the middle.

[0031] In the figure: 1. bottom plate; 2. positioning frame; 3. conical discharge hopper; 4. driving frame; 5. driving shaft; 6. external protective cylinder; 601. limiting ring; 602. feeding pipe; 7. storage cylinder; 8. auxiliary discharge rack; 801. heating plate; 9. sealing bottom plate; 901. discharge cylinder; 902. sliding rod; 10. positioning plate frame; 1001. transmission cylinder; 11. adjusting cylinder; 1101. positioning ring frame; 1102. telescopic sleeve; 12. rectangular limiting frame; 13. pushing cylinder; 14. discharge pipe; 1401. blocking end; 1402. discharge hole; 1403. counterweight ball. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 8 The present invention provides two technical solutions, which specifically include the following embodiments:

[0034] Embodiment 1:

[0035] A low-temperature high-toughness ductile iron production process, characterized in that it specifically comprises the following steps:

[0036] S1, pouring the raw materials into the smelting furnace in sequence for smelting to obtain molten iron, and then performing slag removal on the molten iron after standing;

[0037] S2, spheroidizing the molten iron, and then pouring the spheroidized molten iron into a casting device;

[0038] S3, pouring molten iron into the mold through a pouring device to obtain a casting;

[0039] Among them, the pouring equipment in S2 includes a positioning frame 2, a bottom plate 1 is fixed at the bottom of the positioning frame 2 for placing the mold, driving frames 4 are provided on both sides of the interior of the positioning frame 2, and a driving shaft 5 is installed inside the driving frame 4, an external protective cylinder 6 is rotatably installed below the driving shaft 5, and a storage cylinder 7 is fixed inside the external protective cylinder 6, a positioning plate frame 10 is fixedly installed outside the driving shaft 5, and a transmission cylinder 1001 is connected between the positioning plate frame 10 and the external protective cylinder 6, which is used to drive the external protective cylinder 6 and the storage cylinder 7 to rotate;

[0040] In the embodiment of the present invention, specifically, the driving frame 4 is an existing driving device, which is used to drive the driving shaft 5 to translate inside the positioning frame 2, so that the outer protective cylinder 6 and the storage cylinder 7 can translate with the driving shaft 5 to realize the pouring process;

[0041] In the embodiment of the present invention, specifically, both sides of the top surface of the outer protective cylinder 6 are fixed with limit rings 601, and the limit rings 601 are rotatably sleeved on the outer side of the driving shaft 5. As the transmission cylinder 1001 runs, the storage cylinder 7 and the outer protective cylinder 6 can be driven to rotate along the limit rings 601 to realize the pouring process;

[0042] In the embodiment of the present invention, specifically, the transmission cylinder body 1001 is an existing hydraulic cylinder body, which will not be described in detail here;

[0043] In the embodiment of the present invention, further, a discharge pipe 14 is fixedly installed on the outside of the storage tube 7, and the discharge pipe 14 passes through the outer protective tube 6, and is used to pour the molten iron into the mold. When the storage tube 7 and the outer protective tube 6 rotate along the limit ring 601, the molten iron inside the storage tube 7 can be discharged through the discharge pipe 14 to complete the casting;

[0044] In the embodiment of the present invention, further, an auxiliary unloading rack 8 is provided outside the discharge pipe 14, rectangular limit racks 12 are fixed on both sides of the auxiliary unloading rack 8, and telescopic sleeves 1102 are slidably installed inside the rectangular limit racks 12, and an adjusting cylinder 11 is fixedly installed between the telescopic sleeve 1102 and the driving shaft 5, which is used to adjust the distance between the auxiliary unloading rack 8 and the discharge pipe 14 when the storage cylinder 7 is tilted;

[0045] In the embodiment of the present invention, specifically, during the pouring process, as the storage tube 7 and the outer protective tube 6 rotate along the limit ring 601, the molten iron can enter the auxiliary unloading rack 8 through the discharge channel 14, and then fall from the auxiliary unloading rack 8 to the inside of the mold to complete the pouring operation;

[0046] In the embodiment of the present invention, specifically, when the storage cylinder 7 and the outer protective cylinder 6 rotate along the limit ring 601, the auxiliary unloading rack 8 can be driven to move by adjusting the expansion and contraction of the cylinder body 11, so that the auxiliary unloading rack 8 can always be located below the discharge pipe 14, thereby preventing the molten iron from spilling;

[0047] In the embodiment of the present invention, specifically, a push cylinder 13 is fixedly installed at the bottom of the rectangular limit frame 12, and the piston end of the push cylinder 13 penetrates into the interior of the rectangular limit frame 12 and is fixedly connected to the telescopic sleeve rod 1102, which is used to drive the telescopic sleeve rod 1102 to slide up and down inside the rectangular limit frame 12 to adjust the pouring angle of the auxiliary unloading frame 8;

[0048] In the embodiment of the present invention, specifically, during the pouring operation, as the push cylinder 13 pushes the corresponding telescopic sleeve rod 1102 to slide inside the rectangular limit frame 12, the auxiliary unloading frame 8 can be deflected to adjust the pouring angle, thereby increasing the pouring range and effectively improving the pouring stability;

[0049] In the embodiment of the present invention, specifically, a positioning ring frame 1101 is fixedly installed at the end of the adjusting cylinder body 11, and the positioning ring frame 1101 is fixedly sleeved on the outer side of the driving shaft 5;

[0050] In the embodiment of the present invention, specifically, the adjusting cylinder 11 is an existing device, which will not be described in detail here;

[0051] In the embodiment of the present invention, specifically, both ends of the driving shaft 5 are rotatably sleeved with transmission gears, which are used to drive the driving shaft 5 to translate along the installation direction of the driving frame 4 as the driving frame 4 runs. The driving frame 4 is an existing device and will not be described in detail here.

[0052] In the embodiment of the present invention, specifically, a conical lower hopper 3 is fixedly installed on the top surface of the positioning frame 2, and a feeding pipe 602 adapted to the conical lower hopper 3 is fixedly installed on the top surface of the external protective cylinder 6 for pouring the spheroidized molten iron into the storage cylinder 7.

[0053] Embodiment 2: Based on Embodiment 1, a low-temperature high-toughness ductile iron production process is characterized in that it specifically includes the following steps:

[0054] S1, pouring the raw materials into the smelting furnace in sequence for smelting to obtain molten iron, and then performing slag removal on the molten iron after standing;

[0055] S2, spheroidizing the molten iron, and then pouring the spheroidized molten iron into a casting device;

[0056] S3, pouring molten iron into the mold through a pouring device to obtain a casting;

[0057] Among them, the pouring equipment in S2 includes a positioning frame 2, a bottom plate 1 is fixed at the bottom of the positioning frame 2 for placing the mold, driving frames 4 are provided on both sides of the interior of the positioning frame 2, and a driving shaft 5 is installed inside the driving frame 4, an external protective cylinder 6 is rotatably installed below the driving shaft 5, and a storage cylinder 7 is fixed inside the external protective cylinder 6, a positioning plate frame 10 is fixedly installed outside the driving shaft 5, and a transmission cylinder 1001 is connected between the positioning plate frame 10 and the external protective cylinder 6, which is used to drive the external protective cylinder 6 and the storage cylinder 7 to rotate;

[0058] In the embodiment of the present invention, specifically, the driving frame 4 is an existing driving device, which is used to drive the driving shaft 5 to translate inside the positioning frame 2, so that the outer protective cylinder 6 and the storage cylinder 7 can translate with the driving shaft 5 to realize the pouring process;

[0059] In the embodiment of the present invention, specifically, both sides of the top surface of the outer protective cylinder 6 are fixed with limit rings 601, and the limit rings 601 are rotatably sleeved on the outer side of the driving shaft 5. As the transmission cylinder 1001 runs, the storage cylinder 7 and the outer protective cylinder 6 can be driven to rotate along the limit rings 601 to realize the pouring process;

[0060] In the embodiment of the present invention, specifically, the transmission cylinder body 1001 is an existing hydraulic cylinder body, which will not be described in detail here;

[0061] In the embodiment of the present invention, further, a discharge pipe 14 is fixedly installed on the outside of the storage tube 7, and the discharge pipe 14 passes through the outer protective tube 6, and is used to pour the molten iron into the mold. When the storage tube 7 and the outer protective tube 6 rotate along the limit ring 601, the molten iron inside the storage tube 7 can be discharged through the discharge pipe 14 to complete the casting;

[0062] In the embodiment of the present invention, further, an auxiliary unloading rack 8 is provided outside the discharge pipe 14, rectangular limit racks 12 are fixed on both sides of the auxiliary unloading rack 8, and telescopic sleeves 1102 are slidably installed inside the rectangular limit racks 12, and an adjusting cylinder 11 is fixedly installed between the telescopic sleeve 1102 and the driving shaft 5, which is used to adjust the distance between the auxiliary unloading rack 8 and the discharge pipe 14 when the storage cylinder 7 is tilted;

[0063] In the embodiment of the present invention, specifically, during the pouring process, as the storage tube 7 and the outer protective tube 6 rotate along the limit ring 601, the molten iron can enter the auxiliary unloading rack 8 through the discharge channel 14, and then fall from the auxiliary unloading rack 8 to the inside of the mold to complete the pouring operation;

[0064] In the embodiment of the present invention, specifically, when the storage cylinder 7 and the outer protective cylinder 6 rotate along the limit ring 601, the auxiliary unloading rack 8 can be driven to move by adjusting the expansion and contraction of the cylinder body 11, so that the auxiliary unloading rack 8 can always be located below the discharge pipe 14, thereby preventing the molten iron from spilling;

[0065] In the embodiment of the present invention, specifically, a push cylinder 13 is fixedly installed at the bottom of the rectangular limit frame 12, and the piston end of the push cylinder 13 penetrates into the interior of the rectangular limit frame 12 and is fixedly connected to the telescopic sleeve rod 1102, which is used to drive the telescopic sleeve rod 1102 to slide up and down inside the rectangular limit frame 12 to adjust the pouring angle of the auxiliary unloading frame 8;

[0066] In the embodiment of the present invention, specifically, during the pouring operation, as the push cylinder 13 pushes the corresponding telescopic sleeve rod 1102 to slide inside the rectangular limit frame 12, the auxiliary unloading frame 8 can be deflected to adjust the pouring angle, thereby increasing the pouring range and effectively improving the pouring stability;

[0067] In the embodiment of the present invention, specifically, a positioning ring frame 1101 is fixedly installed at the end of the adjusting cylinder 11, and the positioning ring frame 1101 is fixedly sleeved on the outer side of the driving shaft 5;

[0068] In the embodiment of the present invention, specifically, the adjusting cylinder 11 is an existing device, which will not be described in detail here;

[0069] In the embodiment of the present invention, specifically, the outer protective tube 6 and the storage tube 7 are always coaxial, and the outer protective tube 6 and the storage tube 7 are fixedly connected as one body by a plurality of bolts, so that the outer protective tube 6 and the storage tube 7 can be easily disassembled;

[0070] In the embodiment of the present invention, specifically, both ends of the driving shaft 5 are rotatably sleeved with transmission gears, which are used to drive the driving shaft 5 to translate along the installation direction of the driving frame 4 as the driving frame 4 runs. The driving frame 4 is an existing device and will not be described in detail here.

[0071] In the embodiment of the present invention, specifically, a conical lower hopper 3 is fixedly installed on the top surface of the positioning frame 2, and a feeding pipe 602 adapted to the conical lower hopper 3 is fixedly installed on the top surface of the external protective cylinder 6, which is used to pour the spheroidized molten iron into the storage cylinder 7;

[0072] In the embodiment of the present invention, specifically, a heating plate 801 is fixedly installed inside the external protective tube 6 and inside the auxiliary unloading rack 8. The arrangement of the heating plate 801 can prevent the molten iron from cooling and adhering to the inner wall of the auxiliary unloading rack 8, thereby ensuring the pouring effect and improving the convenience of maintenance;

[0073] In the embodiment of the present invention, a sealing bottom plate 9 is slidably mounted on the end of the auxiliary unloading rack 8, and a unloading cylinder 901 is fixedly mounted on the outer side of the end of the auxiliary unloading rack 8, and the unloading cylinder 901 is used to drive the sealing bottom plate 9 to slide back and forth at the end of the auxiliary unloading rack 8;

[0074] In the embodiment of the present invention, specifically, during the pouring process, as the unloading cylinder 901 drives the sealing bottom plate 9 to slide outward, the molten iron can be discharged through the auxiliary unloading rack 8 to complete the pouring. When the pouring is completed, as the unloading cylinder 901 runs and drives the sealing bottom plate 9 to reset, the auxiliary unloading rack 8 can be blocked to prevent the molten iron from dripping, thereby further ensuring the pouring effect.

[0075] In the embodiment of the present invention, specifically, a plurality of slide bars 902 are fixedly installed at the end of the auxiliary unloading rack 8, and the slide bars 902 penetrate the auxiliary unloading rack 8 and are slidably connected thereto. During the operation of the sealing bottom plate 9, the slide bars 902 can slide inside the auxiliary unloading rack 8 to ensure the operation stability of the sealing bottom plate 9;

[0076] In the embodiment of the present invention, further, the discharge pipe 14 is installed obliquely and is slidably connected to a sealing end head 1401 internally, a discharge hole 1402 is opened inside the sealing end head 1401, and a counterweight ball 1403 is fixedly installed at the end of the sealing end head 1401. Through the setting of the sealing end head 1401, on the one hand, heat dissipation can be reduced, and at the same time, splashing of molten iron through the discharge pipe 14 can be avoided. During the pouring process, as the discharge pipe 14 is tilted, the sealing end head 1401 can be forced to slide toward one end of the counterweight ball 1403, so that the molten iron can be discharged through the discharge hole 1402. When the discharge pipe 14 is reset, the sealing end head 1401 can re-seal the discharge pipe 14 with the cooperation of the counterweight ball 1403.

[0077] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0078] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A low-temperature high-toughness ductile iron production process, characterized in that: The specific steps include: S1, pouring the raw materials into the smelting furnace in sequence for smelting to obtain molten iron, and then performing slag removal on the molten iron after standing; S2, spheroidizing the molten iron, and then pouring the spheroidized molten iron into a casting device; S3, pouring molten iron into the mold through a pouring device to obtain a casting; The casting equipment in S2 comprises a positioning frame (2), a bottom plate (1) is fixed at the bottom of the positioning frame (2) for placing a mold, a driving frame (4) is provided on both sides of the interior of the positioning frame (2), a driving shaft (5) is installed inside the driving frame (4), an external protective cylinder (6) is rotatably installed below the driving shaft (5), a storage cylinder (7) is fixed inside the external protective cylinder (6), a positioning plate frame (10) is fixedly installed outside the driving shaft (5), and a transmission cylinder (1001) is connected between the positioning plate frame (10) and the external protective cylinder (6) for driving the external protective cylinder (6) and the storage cylinder (7) to rotate; A discharge pipe (14) is fixedly installed outside the storage cylinder (7), and the discharge pipe (14) passes through the outer protective cylinder (6) and is used to pour the molten iron into the mold; An auxiliary unloading rack (8) is arranged outside the discharge pipe (14), rectangular limit racks (12) are fixed on both sides of the auxiliary unloading rack (8), and telescopic sleeves (1102) are slidably installed inside the rectangular limit racks (12), and an adjustment cylinder (11) is fixedly installed between the telescopic sleeves (1102) and the driving shaft (5) for adjusting the distance between the auxiliary unloading rack (8) and the discharge pipe (14) when the storage cylinder (7) is tilted.

2. A low temperature and high toughness ductile iron production process according to claim 1, characterized in that: A push cylinder (13) is fixedly mounted at the bottom of the rectangular limit frame (12); a piston end of the push cylinder (13) penetrates into the interior of the rectangular limit frame (12) and is fixedly connected to the telescopic sleeve (1102), and is used to drive the telescopic sleeve (1102) to slide up and down inside the rectangular limit frame (12), thereby adjusting the pouring angle of the auxiliary unloading frame (8).

3. A low temperature high toughness ductile iron production process according to claim 1, characterized in that: A positioning ring frame (1101) is fixedly mounted on the end of the regulating cylinder (11), and the positioning ring frame (1101) is fixedly sleeved on the outside of the driving shaft (5).

4. A low temperature high toughness ductile iron production process according to claim 1, characterized in that: The outer protective cylinder (6) and the storage cylinder (7) always remain coaxial, and the outer protective cylinder (6) and the storage cylinder (7) are fixedly connected as a whole via a plurality of bolts.

5. A low temperature and high toughness ductile iron production process according to claim 1, characterized in that: Both ends of the driving shaft (5) are rotatably sleeved with transmission gears, which are used to drive the driving shaft (5) to move in translation along the installation direction of the driving frame (4) as the driving frame (4) runs.

6. A low temperature high toughness ductile iron production process according to claim 1, characterized in that: A conical lower hopper (3) is fixedly mounted on the top surface of the positioning frame (2), and a feeding pipe (602) adapted to the conical lower hopper (3) is fixedly mounted on the top surface of the external protective cylinder (6) for pouring the spheroidized molten iron into the interior of the storage cylinder (7).

7. A low temperature and high toughness ductile iron production process according to claim 1, characterized in that: A heating plate (801) is fixedly installed inside the external protective cylinder (6) and inside the auxiliary unloading rack (8).

8. A low temperature high toughness ductile iron production process according to claim 1, characterized in that: A sealing bottom plate (9) is slidably mounted on the end of the auxiliary unloading rack (8), and a unloading cylinder (901) is fixedly mounted on the outer side of the end of the auxiliary unloading rack (8). The unloading cylinder (901) is used to drive the sealing bottom plate (9) to slide back and forth on the end of the auxiliary unloading rack (8).

9. A low temperature high toughness ductile iron production process according to claim 8, characterized in that: A plurality of sliding rods (902) are fixedly mounted on the end of the auxiliary material unloading rack (8), and the sliding rods (902) penetrate the auxiliary material unloading rack (8) and are slidably connected thereto.

10. A process for producing low-temperature high-toughness ductile iron according to claim 1, characterized in that: The discharge pipe (14) is installed obliquely and is slidably connected to a plugging end (1401) inside. A discharge hole (1402) is provided inside the plugging end (1401), and a weighted ball (1403) is fixedly installed at the end of the plugging end (1401).

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