Pouring production system and control method thereof

Abstract

The invention relates to a pouring production system, and belongs to the field of casting production. The pouring production system comprises a smelting area and a pouring area which are adjacent, and an electric door is arranged at the junction of the smelting area and the pouring area to control connection and disconnection of the smelting area and the pouring area. Wherein the smelting area is internally provided with a smelting furnace used for heating metal raw materials to be in a molten state, the pouring area is internally provided with a centrifugal machine used for evenly distributing the metal raw materials in the molten state into a mold, and the multiple pouring RGVs move between the smelting area and the pouring area so as to convey the metal raw materials in the molten state.

Description

Technical Field

[0001] The invention belongs to the technical field of casting production, and relates to a pouring production system and a control method thereof. Background Art

[0002] Centrifugal casting, as an advanced metal forming technology, is centered on injecting liquid metal into a high-speed rotating mold, using centrifugal force to evenly distribute the molten metal and fill the entire mold, thereby forming a casting of the desired shape. This process not only enhances the filling capacity of the molten metal, but also significantly improves the density and mechanical properties of the casting, and reduces common defects in traditional casting such as pores and slag inclusions. The origin of this technology can be traced back to the production of cast pipes. Due to its significant process advantages, such as high yield, simplified production process and excellent casting quality, centrifugal casting has been rapidly widely used in many industrial fields, especially in metallurgy, mining, transportation, irrigation and drainage machinery, aviation and national defense. For the production of complex-shaped parts such as tubular, sleeve-shaped, and ring-shaped, centrifugal casting has demonstrated its irreplaceable value.

[0003] However, within the framework of the existing technology, there are still some urgent problems to be solved in the pouring system of centrifugal casting. Traditionally, the pouring system mostly uses an integrally movable tundish and croissant as a transport tool for molten metal raw materials. Although this design meets the production needs to a certain extent, when facing roller production lines of different lengths, since the pouring position of the pouring robot or vehicle is relatively fixed, it is often necessary to extend the robot arm or adjust the position of the vehicle for pouring, which not only increases the complexity of the operation, but also easily leads to inaccurate pouring position, thereby affecting the dimensional accuracy and overall quality of the casting. Especially in industrial production that requires high precision and high consistency, the instability of this pouring method has become a key factor restricting production efficiency and product quality. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a casting production system and a control method thereof. By dividing the production system into a smelting area and a pouring area, and effectively isolating them through electric doors, the independence and safety between the two areas are ensured. The smelting area is responsible for heating the metal raw materials to a molten state, while the centrifuge in the pouring area is responsible for evenly distributing the molten metal into the mold, realizing a clear division of labor and efficient collaboration in the production process. By independently setting up the tundish and the croissant, the problem of inaccurate pouring caused by the pouring RGV itself extending for pouring is avoided, thereby improving the production quality of the product.

[0005] To achieve the above-mentioned purpose, the present invention provides a casting production system, comprising adjacent smelting area and casting area, wherein an electric door is arranged at the junction of the smelting area and the casting area to control the opening and closing of the two; wherein a smelting furnace for heating metal raw materials to a molten state is arranged in the smelting area, and a centrifuge for evenly distributing the molten metal raw materials into a mold is arranged in the casting area, and a plurality of casting RGVs move between the smelting area and the casting area to transport the molten metal raw materials.

[0006] Optionally, the casting production system also includes a transfer component, which is arranged on a side of the centrifuge close to the casting RGV; when the casting RGV moves to the centrifuge, the transfer component is located between the casting RGV and the centrifuge to receive the metal raw materials in the casting RGV and transfer the metal raw materials to the centrifuge.

[0007] Optionally, the transfer component includes a tundish and a croissant, which are movably arranged on one side of the centrifuge close to the casting RGV; the croissant is located between the tundish and the centrifuge, and its outlet extends toward the centrifuge, and the outlet corresponds to the feed port of the centrifuge. The metal raw material in the casting RGV flows into the croissant through the tundish, and is further transported to the centrifuge through the croissant.

[0008] Optionally, the casting RGV is provided with a ladle for containing metal raw materials, a telescopic mechanism, a lifting mechanism and a flipping mechanism, the telescopic mechanism is used to drive the ladle towards or away from the centrifuge, the lifting mechanism is used to drive the ladle to move in the vertical direction, and the flipping mechanism is used to drive the ladle to tilt.

[0009] Optionally, the casting RGV is provided with a laser radar sensor for detecting whether there are foreign objects blocking its forward direction.

[0010] Optionally, the pouring RGV is provided with an infrared distance measuring sensor for detecting the distance between it and the tundish.

[0011] Optionally, the casting production system also includes a charging and maintenance area. An electric door is provided at the junction of the charging and maintenance area and the smelting area to control the opening and closing of the two. The smelting area is arranged between the casting area and the charging and maintenance area. The charging and maintenance area is used to park the casting RGV.

[0012] Optionally, the casting production system also includes a track for guiding the movement of the casting RGV, and the track is laid through the charging and maintenance area, the smelting area and the casting area.

[0013] Optionally, an RFID reader is also provided on the casting RGV, and an RFID tag is provided on the track. When the casting RGV runs on the track, the RFID reader reads the position information on the RFID tag and transmits the position information to the casting production system.

[0014] The present invention provides a casting production method based on the above-mentioned casting production system, comprising: obtaining a start signal, two casting RGVs receiving metal raw materials in a molten state; the two casting RGVs move to the casting area, one of the casting RGVs pours molten iron into each centrifuge through a tundish to complete the casting of an outer layer of molten iron; after the above-mentioned casting RGV finishes pouring, the other casting RGV again pours molten iron into each centrifuge through the tundish to complete the casting of an inner layer of molten iron; after the above-mentioned two casting RGVs finish pouring, the two casting RGVs return to their initial positions.

[0015] The beneficial effect of the present invention is that the production system is divided into a smelting area and a pouring area, and the two areas are effectively isolated by electric doors, thereby ensuring the independence and safety between the two areas. The smelting area is responsible for heating the metal raw materials to a molten state, while the centrifuge in the pouring area is responsible for evenly distributing the molten metal into the mold, thereby achieving a clear division of labor and efficient collaboration in the production process. By independently setting up the tundish and the croissant, the problem of inaccurate pouring caused by the pouring RGV itself extending for pouring is avoided, thereby improving the production quality of the product.

[0016] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 A schematic diagram of the structure of a casting production system provided in an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the structures of the casting RGV, transfer assembly and centrifuge in the casting production system provided in an embodiment of the present application.

[0020] Figure numerals: 1-pouring RGV; 2-smelting furnace; 3-track; 4-electric door; 5-centrifuge; 6-returning tank; 7-mold transfer AGV; 8-safety door; 9-furnace front operation station; 10-tundish; 11-croissant; 12-centrifuge protective cover; 13-molten iron ladle; 14-weighing display screen; 15-stainless steel accordion cover; 16-electric control box; 17-lidar sensor; 18-infrared ranging sensor. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0022] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] RGV, the full name of which is Rail Guided Vehicle, is translated into Chinese as "rail-guided vehicle" or "rail-guided shuttle vehicle". It is an automated handling device that runs along a fixed track. RGV relies on on-board sensors, lasers or magnetic strip guidance systems to identify and locate the running track, thereby accurately completing the task of transferring goods between different stations.

[0025] AGV, the full name of which is Automated Guided Vehicle, is a transport vehicle equipped with an electromagnetic or optical automatic guidance device that can travel along a specified guidance path and has safety protection and various transfer functions.

[0026] See also Figure 1-2, is a casting production system including adjacent smelting area and casting area, which are physically isolated by an electric door 4 to ensure safety and independence during the production process. One or more smelting furnaces 2 are arranged inside the smelting area to heat the metal raw materials to a molten state. The casting area is equipped with a centrifuge 5, which is responsible for evenly distributing the molten metal raw materials into the mold to form high-quality castings.

[0027] Optionally, the pouring production system also includes a charging and maintenance area. The charging and maintenance area is used to park and maintain the pouring RGV1 (Robot Guided Vehicle) in a non-working state. An electric door 4 is also provided between the charging and maintenance area and the smelting area to ensure safety during the maintenance process. In order to guide the pouring RGV1 to move efficiently between various areas, the pouring production system has laid a track 3 that runs through the charging and maintenance area, the smelting area and the pouring area. An RFID tag is embedded in the track 3, and the pouring RGV1 is equipped with an RFID reader. When the pouring RGV1 runs along the track 3, the RFID reader can read the RFID tag information on the track 3 in real time, and transmit the location data to the control center of the pouring production system to achieve precise navigation and scheduling.

[0028] Optionally, the smelting area is also provided with a furnace front operation station 9. The operator can monitor the operating status of the entire production line through the furnace front operation station 9, including the working conditions of the smelting furnace 2, the pouring RGV1, the centrifuge 5 and other auxiliary equipment. According to the production plan and order information, the furnace front operation station 9 can automatically or manually dispatch various production equipment to ensure the smooth progress of the production process. In the pouring preparation stage, the operator needs to confirm the completion of the pouring preparation work at the furnace front operation station 9, confirm that all safety doors 8 are locked, the pouring area has been cleared, and no personnel are stranded. After confirmation, the furnace front operation station 9 sends instructions to the pouring RGV1 and the smelting furnace 2, and smelts the metal raw materials. During the production process, in the event of an emergency or equipment failure, the operator can quickly take shutdown measures through the furnace front operation station 9 to ensure the safety of equipment and personnel. At the same time, the furnace front operation station 9 can also display fault information to guide the operator to troubleshoot or contact maintenance personnel for processing.

[0029] In one possible embodiment, the casting production system includes a transfer component, which is arranged on a side of the centrifuge 5 close to the casting RGV1; when the casting RGV1 moves to the centrifuge 5, the transfer component is located between the casting RGV1 and the centrifuge 5 to receive the metal raw material in the casting RGV1 and transfer the metal raw material to the centrifuge 5.

[0030] Furthermore, the transfer component includes a tundish 10 and a croissant 11, which are movably arranged on one side of the centrifuge 5 close to the pouring RGV1; the croissant 11 is located between the tundish 10 and the centrifuge 5, and its outlet extends toward the centrifuge 5, and the outlet corresponds to the feed port of the centrifuge 5. The metal raw material in the pouring RGV1 flows into the croissant 11 through the tundish 10, and is further transported to the centrifuge 5 through the croissant 11.

[0031] In the casting production system, multiple casting RGV1s reciprocate between the smelting area and the casting area to transport molten metal raw materials. The casting RGV1 is equipped with a special iron ladle 13, which is internally provided with a telescopic mechanism, a lifting mechanism and a flipping mechanism. The telescopic mechanism allows the iron ladle 13 to move closer to or farther from the centrifuge 5 in the horizontal direction to meet the needs of different casting positions; the lifting mechanism is used to adjust the position of the iron ladle 13 in the vertical direction to ensure the accuracy of the casting process; the flipping mechanism is responsible for driving the iron ladle 13 to flip when it reaches the casting position to achieve accurate pouring of the molten iron.

[0032] Specifically, Figure 2 As shown, the lifting mechanism is a lifting column arranged on the RGV base, that is, the lifting mechanism can adjust the position of the molten iron ladle 13 in the Z-axis direction. The telescopic mechanism is a telescopic beam connected to the lifting column and extending toward the centrifuge 5, that is, the telescopic mechanism can adjust the position of the molten iron ladle 13 in the Y-axis direction, so that the molten iron ladle 13 is close to or away from the tundish 10. The tilting mechanism is a tilting bracket hinged on the side of the telescopic beam close to the tundish 10, and the molten iron ladle 13 is connected to the tilting bracket. The tilting mechanism can rotate the molten iron ladle 13 around the R axis, and then can dump the metal raw material in the molten iron ladle 13 into the tundish 10. It should be noted that the lifting column, the telescopic beam, and the tilting bracket are all mechanical mechanisms commonly used by those skilled in the art, which are not shown in the figure and will not be described in detail here.

[0033] In the specific implementation process, the pouring RGV1 moves in front of the centrifuge 5 through the track 3, and ensures that the molten iron ladle 13 is aligned with the tundish 10. In the Y-axis direction, the telescopic beam connected to the lifting column is extended, so that the tipping bracket on the telescopic beam drives the molten iron ladle 13 close to the tundish 10. When the molten iron ladle 13 is close to the tundish 10 to a suitable position, the tipping mechanism is started, and the tipping bracket rotates around the R axis, driving the molten iron ladle 13 to tilt, so that the molten metal raw material in the molten iron ladle 13 flows into the tundish 10 through the pouring action. After the metal raw material is completely poured from the molten iron ladle 13 to the tundish 10, the tundish 10 starts to move automatically toward the croissant 11. This movement is driven by a servo motor. After the tundish 10 moves to a suitable position, the tundish 10 can pour the metal raw material therein into the croissant 11. The design of the croissant 11 makes its outlet closely correspond to the feed port of the centrifuge 5, ensuring that the metal raw material can flow smoothly into the centrifuge 5. As the metal raw material flows into the centrifuge 5, the centrifuge 5 starts to rotate at a high speed, so that the metal raw material is evenly distributed in the mold under the action of centrifugal force, and finally forms the desired casting.

[0034] Optionally, a centrifuge protective cover 12 is provided on the centrifuge 5. A stainless steel accordion cover 15 is provided on the telescopic mechanism. The centrifuge protective cover 12 can prevent the splashing objects generated by the centrifuge 5 when rotating at high speed from injuring people, such as metal fragments, hot molten iron, etc. Through physical isolation, the risk of personal injury caused by improper operation of the centrifuge 5 or equipment failure is significantly reduced. Before pouring, the centrifuge protective cover 12 is closed to ensure that the centrifuge 5 works in a closed environment. After the pouring is completed, wait until the centrifuge 5 stops rotating completely and the temperature drops, and then open the protective cover for the next step. The stainless steel accordion cover 15 can prevent the splashing of molten iron, heat radiation, etc. from damaging other equipment or lines on the casting RGV1, thereby reducing the damage to the casting RGV1 caused by external environmental factors (such as high temperature, humidity, corrosion, etc.). The stainless steel accordion cover 15 can significantly improve the durability and reliability of the equipment and reduce the failure of the casting RGV1 caused by external environmental factors. When designing the casting RGV1, the stainless steel accordion cover 15 is installed as part of the telescopic mechanism. During the pouring process, the stainless steel bellows cover 15 expands or contracts with the movement of the telescopic mechanism, and always covers the top of the telescopic mechanism.

[0035] In a possible embodiment, a weighing display screen 14 is also provided on the pouring RGV1. During the pouring process, the operator can check the weight of the molten iron ladle 13 at any time through the weighing display screen 14 to ensure the accuracy of the molten iron amount and avoid affecting the product quality due to insufficient or excessive molten iron. The data of the weighing display screen 14 can be compared with the weighing data of the tundish 10 of the centrifuge 5 in real time to achieve precise control of the pouring process. When the weighing data on the pouring RGV1 differs too much from the weighing data of the tundish 10, the weighing display screen 14 can be used as part of the alarm prompt to promptly notify the operator to check possible fault points. By setting the weighing display screen 14, the pouring production system can monitor and display the weight of the molten iron in real time to ensure that the amount of molten iron poured each time is accurate, thereby improving the production quality and consistency of the product. By setting the weighing display screen 14, the operator can promptly discover and deal with abnormal molten iron weight to avoid safety hazards such as overflow or sputtering due to excessive molten iron. Automated and precise pouring control reduces the need for human intervention, speeds up the production process, and improves overall production efficiency.

[0036] Furthermore, an electric control box 16 is also provided on the casting RGV1, which can provide a stable and reliable power supply for various motors, sensors, displays and other components on the casting RGV1. At the same time, it also has overcurrent, overvoltage and other protection functions to ensure the safe and stable operation of the electrical system.

[0037] To further improve the accuracy and safety of pouring, a laser radar sensor 17 and an infrared distance sensor 18 are also installed on the pouring RGV1. The laser radar sensor 17 is used to detect in real time whether there are foreign objects blocking the forward direction of the pouring RGV1. Once an obstacle is found, emergency braking is immediately triggered to prevent collision accidents. The infrared distance sensor 18 is used to monitor the distance between the pouring RGV1 and the tundish 10 to ensure accurate control of the pouring process.

[0038] In the specific workflow, when the pouring production system receives the start signal, the two pouring RGV1s go to the smelting area to receive the molten metal raw materials. Then, they move along the track 3 to the pouring area, and according to the predetermined order and path, the molten iron is accurately poured into the centrifuge 5 through the tundish 10 and the croissant 11. During the pouring process, the molten iron first enters the tundish 10, and then is further transported to the feed port of the centrifuge 5 through the croissant 11. After completing a round of pouring, the other pouring RGV1 continues to perform the same operation to ensure the continuity and stability of the pouring process. After both pouring RGV1s complete the pouring task, they will automatically return to the initial position or the charging and maintenance area to wait for the next task instruction.

[0039] In a possible embodiment, a remelting tank 6 is further provided in the casting area of ​​the casting production system. The remelting tank 6 is used to collect and process the metal raw materials that fail to enter the centrifuge 5, or to collect the excess metal raw materials generated during the casting process. These metal raw materials can be remelted and reused, thereby reducing waste and improving production efficiency.

[0040] In a possible implementation, the casting production system is further provided with a mold transfer AGV 7, which is used to transfer molds (casting molds) within the casting area or between other areas. After the casting is completed, the mold transfer AGV 7 can transfer the mold containing the finished product to the next production link (such as cooling, cleaning, inspection, etc.), or transfer the empty mold back to the casting area for next use.

[0041] In one possible implementation, the casting production system is integrated with a dynamic compensation algorithm for the weight of the metal raw material. When the weight of the first casting (outer layer of molten iron) is less, the casting production system will automatically adjust the casting amount of the second casting (inner layer of molten iron) according to the preset compensation rules to ensure the consistency of the total weight of the product. This function is achieved by obtaining the weighing data of the casting RGV1 and the centrifuge 5 tundish 10 in real time, combined with the product weight requirements in the production order.

[0042] In a possible implementation, the pouring production system has a preset program. The pouring sequence and time interval of the two pouring RGV1 are controlled by the preset program. For example, the first pouring RGV1 first completes the pouring of the outer layer of molten iron, and after waiting for a certain period of time, the second pouring RGV1 pours the inner layer of molten iron. The amount of molten iron poured each time is monitored in real time by a weighing sensor and compared with the preset pouring amount to ensure the accuracy of the pouring amount.

[0043] In a possible implementation, the casting production system has a status monitoring module that can collect and record key parameters of each device in real time, such as the power of the casting RGV1, the position of the casting RGV1, the weight of the molten iron, the status and speed of the centrifuge 5, the position of the tundish 10, etc. The data is transmitted to the casting production system through the workshop wireless network or wired network.

[0044] In one possible implementation, the pouring production system installs smart cameras at key locations of the production line and connects them to a server for real-time monitoring. The cameras have functions such as night vision and motion detection to ensure round-the-clock monitoring of the production line's operation.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A casting production system, characterized in that: It includes adjacent smelting area and pouring area, and an electric door (4) is arranged at the junction of the smelting area and the pouring area to control the opening and closing of the two areas; wherein, A smelting furnace (2) for heating metal raw materials to a molten state is arranged in the smelting zone, a centrifuge (5) for evenly distributing the molten metal raw materials into a mold is arranged in the pouring zone, and a plurality of pouring RGVs (1) move between the smelting zone and the pouring zone to transport the molten metal raw materials.

2. The pouring production system according to claim 1, characterized in that: The invention also comprises a transfer component, which is arranged on a side of the centrifuge (5) close to the casting RGV (1); when the casting RGV (1) moves to the centrifuge (5), the transfer component is located between the casting RGV (1) and the centrifuge (5) to receive the metal raw material in the casting RGV (1) and transfer the metal raw material to the centrifuge (5).

3. The pouring production system according to claim 2, characterized in that: The transfer assembly comprises a tundish (10) and a croissant (11), wherein the tundish (10) and the croissant (11) are movably arranged on a side of a centrifuge (5) close to a pouring RGV (1); the croissant (11) is located between the tundish (10) and the centrifuge (5), and its outlet extends toward the centrifuge (5), and the outlet corresponds to a feed port of the centrifuge (5); the metal raw material in the pouring RGV (1) flows into the croissant (11) through the tundish (10), and is further transported to the centrifuge (5) through the croissant (11).

4. The pouring production system according to any one of claims 1 to 3, characterized in that: The casting RGV (1) is provided with a molten iron ladle (13) for containing metal raw materials, a telescopic mechanism, a lifting mechanism and a turning mechanism. The telescopic mechanism is used to drive the molten iron ladle (13) to approach or move away from the centrifuge (5), the lifting mechanism is used to drive the molten iron ladle (13) to move in a vertical direction, and the turning mechanism is used to drive the molten iron ladle (13) to tilt.

5. The pouring production system according to any one of claims 1 to 3, characterized in that: The casting RGV (1) is provided with a laser radar sensor (17) for detecting whether there is any foreign object blocking its forward direction.

6. The pouring production system according to any one of claims 1 to 3, characterized in that: The pouring RGV (1) is provided with an infrared distance sensor (18) for detecting the distance between it and the tundish (10).

7. The pouring production system according to any one of claims 1 to 3, characterized in that: It also includes a charging and maintenance area. An electric door (4) is arranged at the junction of the charging and maintenance area and the smelting area to control the opening and closing of the two areas. The smelting area is arranged between the casting area and the charging and maintenance area. The charging and maintenance area is used to park the casting RGV (1).

8. The pouring production system according to claim 7, characterized in that: It also includes a track (3) for guiding the movement of the pouring RGV (1), and the track (3) is laid through the charging and maintenance area, the smelting area and the pouring area.

9. The pouring production system according to claim 8, characterized in that: The casting RGV (1) is also provided with an RFID reader / writer, and the track (3) is provided with an RFID tag. When the casting RGV (1) runs on the track (3), the RFID reader / writer reads the position information on the RFID tag and transmits the position information to the casting production system.

10. A control method for a casting production system according to any one of claims 1 to 9, characterized in that: include: After receiving a start signal, two pouring RGVs (1) receive the molten metal raw materials; Two pouring RGVs (1) move to the pouring area, and one of the pouring RGVs (1) pours molten iron into each centrifuge (5) through a tundish (10) to complete the pouring of the outer layer of molten iron; After the pouring of the above-mentioned pouring RGV (1) is completed, another pouring RGV (1) again pours the molten iron into each centrifuge (5) through the tundish (10) to complete the pouring of the inner layer of molten iron; After the pouring of the two pouring RGVs (1) is completed, the two pouring RGVs (1) return to their initial positions.

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