High-purity pig iron casting system and flow control method thereof

Abstract

The present application relates to high-purity pig iron manufacturing technology field, especially to a kind of high-purity pig iron casting system and its flow control method, it includes iron runner, hydraulic mechanism, pouring pipeline and conveying mechanism, the hydraulic mechanism is cascaded hydraulic mechanism, the iron runner is connected with the upper end of pouring pipeline by flow guide pipeline, the middle section of pouring pipeline is provided with balance valve, angle sensor is installed on the balance valve, the conveying mechanism is provided with several casting molds, the bottom end of pouring pipeline is guided to any one casting mold.The present application is realized to the flow rate automatic control of molten iron by the cooperation of hydraulic mechanism and balance valve set on pouring pipeline, simple and efficient;In the casting process of high-purity pig iron, both can guarantee the product casting quality of high-purity pig iron, and can guarantee the efficient high-purity pig iron casting operation efficiency;Not only can reduce the investment and maintenance of scale monitoring equipment, but also can reduce the input of manpower, realize the purpose of cost reduction and efficiency increase.

Description

Technical Field

[0001] This invention relates to the field of high-purity pig iron manufacturing technology, and in particular to a high-purity pig iron casting system and its flow control method. Background Technology

[0002] High-purity pig iron is a high-end casting iron with low levels of harmful impurities such as phosphorus, sulfur, manganese, and titanium, and very low levels of specific trace elements. It is mainly used in wind power castings, nuclear power castings, large-section ductile iron castings, and ductile iron castings requiring low-temperature impact toughness and fatigue performance. The casting process of high-purity pig iron involves roasting high-purity iron ore, heating the ore in a blast furnace to produce molten pig iron, desulfurizing it, and then pouring the molten pig iron into a ladle to maintain its high temperature. The ladle is then connected to a casting mold, and the flow of the molten iron is controlled to enter the mold. It is then cooled and solidified as needed to form the desired casting. After cooling, the casting can undergo further processing, such as removing oxides and sand shells from the surface and adjusting the dimensions of the casting.

[0003] In the process of pouring molten iron into a mold, the flow rate is typically adjusted to 60%–80% of full capacity, depending on the temperature of the molten steel. At higher temperatures, the lower limit of 60% is used. The molten steel should spread evenly at the bottom of the mold to prevent splashing, and the pouring speed should be slowed down towards the end of the pouring process to protect the surface quality of the product and avoid the formation of bubbles and porosity. During the pouring process, the flow rate can be increased to improve production efficiency without causing splashing. However, these operations are mostly manual, which not only increases labor costs but may also result in products failing to meet detailed standards and requirements. Some workshops adopt mechanized production processes, which involve the use of automated intelligent control systems, temperature control systems, monitoring systems, flow rate regulation systems, and mold monitoring systems. These systems not only increase investment costs but also involve the maintenance and upkeep of various equipment, representing a significant expense for the company in the long run. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a high-purity pig iron casting system and its flow control method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A high-purity pig iron casting system includes a molten iron chute, a hydraulic mechanism, a pouring pipe, and a conveying mechanism. The hydraulic mechanism is a cascaded hydraulic mechanism, comprising a first hydraulic component, a second hydraulic component controlled by the first hydraulic component, and a third hydraulic component controlled by the second hydraulic component. The top end of the first hydraulic component is fixed. The movement trajectories of the second and third hydraulic components are vertically downward. The pouring pipe is vertically arranged and its top end is connected to the third hydraulic component. The molten iron chute is connected to the upper end of the pouring pipe through a guide pipe. A balance valve is provided in the middle section of the pouring pipe. An angle sensor is installed on the balance valve. The balance valve includes a valve plate inside the pipe and a control plate outside the pipe. A vertical stop rod is installed on the second hydraulic component, and the stop rod engages with the control plate. Several casting molds are provided on the conveying mechanism, and the bottom end of the pouring pipe guides any one of the casting molds.

[0007] Furthermore, the cross-sectional structure of the valve plate is adapted to the inner cavity cross-section of the casting pipe. When the control plate is rotated, the balance valve acts as a fulcrum to control the rotation of the valve plate, and the valve plate can seal the inner cavity of the casting pipe.

[0008] Furthermore, the guiding pipe includes a first pipe connected to the molten iron chute and a second pipe connected to the pouring pipe, the first and second pipes being movably connected. During the vertical movement of the hydraulic mechanism, the first and second pipes remain movably connected and connected at all times.

[0009] Furthermore, the total length of movement of the cascaded hydraulic mechanism is greater than the distance from the top surface of the first hydraulic component to the top surface of the transmission mechanism. The cascaded hydraulic mechanism consists of three hydraulic components, each controlling the movement of the next hydraulic component through hydraulic transmission. By rationally designing and controlling the pressure, flow rate, and valve operation in the hydraulic system, complex motion control and force transmission can be achieved.

[0010] Furthermore, it also includes a ladle for transporting molten iron, with a tilting device on one side for lifting the ladle and tilting it to guide it into a molten iron chute. The tilting device can tilt the molten iron from the ladle into the corresponding molten iron chute, where it awaits entry into the next process.

[0011] Furthermore, the pouring pipe, balancing valve, conveying mechanism, and guide pipe are all made of refractory materials. The materials are selected based on the application scenario and requirements to meet the refractory and wear-resistant needs of different parts.

[0012] Furthermore, this includes the following steps:

[0013] S1: Determine the flow rate in the pouring pipe ;

[0014] S2: Deflection angle of the valve plate based on the flow velocity Perform calculations;

[0015] S3: Based on the calculated deflection angle Adjust the valve plate until the angle sensor reading matches the calculated deflection angle. correspond.

[0016] Furthermore, the specific process of step S2 includes:

[0017] The deflection angle of the valve plate is calculated as follows:

[0018]

[0019] in, Indicates flow rate. Indicates the angle of deflection;

[0020] Based on the principle of flow control, there is a non-linear relationship between the deflection angle and the water flow rate. The functional form of the flow characteristic curve of the valve plate is:

[0021] ;

[0022] in, Represents a constant. This indicates the performance parameters of the valve plate.

[0023] The flow rate when the valve plate is fully open is Then we have:

[0024]

[0025] Right now:

[0026]

[0027] At this point, the flow characteristic curve is described as follows:

[0028]

[0029] Given a flow Solve for the corresponding valve plate deflection angle. ,Right now:

[0030] ;

[0031] in, This represents the arcsine function.

[0032] Furthermore, when the deflection angle Less than 1 hour, Take a value between 1.5 and 2.5, where, Indicates the angle of deflection in radians.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. This invention achieves automated control of the flow rate of molten iron through the cooperation of a hydraulic mechanism and a balance valve installed on the pouring pipe, which is simple and efficient;

[0035] 2. In the casting process of high-purity pig iron, the entire system has a short operation process and simple procedures, which can ensure both the casting quality of high-purity pig iron products and the high efficiency of high-purity pig iron casting operations.

[0036] 3. The present invention has a simple structure and low cost of production components. It can not only reduce the investment and maintenance of large-scale monitoring and control equipment, but also reduce the investment of manpower, thereby achieving the purpose of cost reduction and efficiency improvement. It is easy to manufacture and install on a large scale and has a wide range of applications. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a structural diagram of the cascaded hydraulic mechanism and the casting pipeline;

[0039] Attached diagram labels: 1-Iron chute, 2-Hydraulic mechanism, 201-First hydraulic component, 202-Second hydraulic component, 203-Third hydraulic component, 3-Pouring pipe, 4-Transfer mechanism, 5-Guide pipe, 501-First pipe, 502-Second pipe, 6-Balance valve, 601-Valve plate, 602-Control plate, 7-Push rod, 8-Casting mold, 9-Ladle, 10-Tilting device. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0041] Example 1

[0042] like Figure 1 , 2As shown, this invention discloses a high-purity pig iron casting system and its flow control method, including a molten iron chute 1, a hydraulic mechanism 2, a pouring pipe 3, and a conveying mechanism 4. The hydraulic mechanism 2 is a cascaded hydraulic mechanism, which includes a first hydraulic component 201, a second hydraulic component 202 controlled by the first hydraulic component 201, and a third hydraulic component 203 controlled by the second hydraulic component 202. The top end of the first hydraulic component 201 is fixed, and the movement trajectories of the second hydraulic component 202 and the third hydraulic component 203 are vertically downward. The pouring pipe... The casting pipe 3 is vertically arranged and its top end is connected to the third hydraulic component 203. The molten iron chute 1 is connected to the upper end of the casting pipe 3 through the guide pipe 5. A balance valve 6 is provided in the middle section of the casting pipe 3. An angle sensor is installed on the balance valve 6. The balance valve 6 includes a valve plate 601 inside the pipe and a control plate 602 outside the pipe. A vertical abutment 7 is installed on the second hydraulic component 202. The abutment 7 is in contact with the control plate 602. Several casting molds 8 are provided on the conveying mechanism 4. The bottom end of the casting pipe 3 is guided to any one of the casting molds 8. Preferably, the angle sensor is an MKY-WDS36-2K angle sensor.

[0043] The cross-sectional structure of the valve plate 601 is adapted to the inner cavity cross-section of the casting pipe 3. Specifically, the balance valve 6 connects the valve plate 601 and the regulating plate 602. When the regulating plate 602 is rotated, the balance valve 6 acts as a fulcrum to control the rotation of the valve plate 601, allowing the valve plate 601 to seal the inner cavity of the casting pipe 3. The adapted cross-sectional structure can be of various forms, such as circular, square, or elliptical, and the shape of the valve plate 601 depends on the specific pipe design of the casting pipe 3. In this embodiment, a circular valve plate 601 design is used. When using different valve plate 601 shapes, the deflection angle of the valve plate... Different calculation formulas require adaptive adjustments based on the selected shape formula. The key is to ensure that the shape of the valve plate 601 can cover the inner cavity of the pipe to ensure a tight seal. When the valve plate 601 is closed, it must be able to isolate the fluid medium inside the pipe to prevent leakage or loss.

[0044] The guide pipe 5 includes a first pipe 501 connected to the molten iron chute 1 and a second pipe 502 connected to the casting pipe 3, with the first pipe 501 and the second pipe 502 movably connected. Specifically, the inner cavities of the first pipe 501 and the second pipe 502 are connected, and the first pipe 501 and the second pipe 502 remain connected during the vertical movement of the hydraulic mechanism 2. Preferably, the first pipe 501 and the second pipe 502 are connected by an expansion joint, and the two ends of the pipes connected by the expansion joint are equipped with flanges, which are fastened by bolts and nuts. The flanges are made of high-temperature resistant alloy steel or stainless steel to ensure their stability and corrosion resistance at high temperatures. The expansion joint body is a key component of the connection; it is made of high-temperature resistant metal material, and the expansion joint body usually has a corrugated shape, allowing it to expand and contract when the pipe length changes.

[0045] The total length of the cascaded hydraulic mechanism is greater than the distance from the top surface of the first hydraulic component 201 to the top surface of the transmission mechanism 4. Specifically, the cascaded hydraulic mechanism consists of three hydraulic components: a first hydraulic component 201, a second hydraulic component 202, and a third hydraulic component 203. The first hydraulic component 201 controls the movement of the second hydraulic component 202, and the second hydraulic component 202 controls the movement of the third hydraulic component 203. That is, each hydraulic component controls the movement of the next hydraulic component through hydraulic transmission. The working principle of this mechanism is as follows: when fluid in the hydraulic system is supplied by a pressure source, the flow rate of the fluid is regulated by controlling the valve, and hydraulic pressure is generated in the hydraulic cylinder or hydraulic motor. The hydraulic pressure generated by the first hydraulic component 201 (such as a hydraulic pump or hydraulic motor) is transmitted to the second hydraulic component 202 (such as a hydraulic cylinder), causing it to move. Similarly, the hydraulic pressure generated by the second hydraulic component 202 is transmitted to the third hydraulic component 203 to control its movement. By rationally designing and controlling the pressure, flow rate, and valve operation in the hydraulic system, complex motion control and force transmission can be achieved.

[0046] The system also includes a ladle 9 for transporting molten iron. One side of the ladle 9 is equipped with a tilting device 10 for lifting and tilting the ladle 9 into the molten iron chute 1. Specifically, each tilting device 10 has a set of support arms and hydraulic cylinders on each side, and a ladle 9 locking mechanism is installed at the center of the top of the tilting device 10. The support arms of the tilting device 10 support and fix the ladle 9, effectively preventing movement when the tilting device 10 lifts and tilts the ladle 9. Two sets of hydraulic cylinders are located on both sides of the tilting device 10, capable of lifting and tilting the ladle 9. The maximum tilting angle is 55°. Limit switches are installed at the bottom to interlock and stop the hydraulic cylinders. The ladle 9 can then tilt the molten iron into the corresponding molten iron chute 1, awaiting entry into the next process.

[0047] The pouring pipe 3, balancing valve 6, conveying mechanism 4, and guiding pipe 5 are all made of refractory materials. Specifically, the temperature of molten steel can reach up to 1700°C. Commonly used refractory materials include silica bricks, magnesia bricks, silicon carbide bricks, high-alumina bricks, and carbonaceous materials. The melting points of these materials are all higher than the temperature of molten steel. Therefore, materials can be selected according to the application scenario and requirements to meet the refractory and wear-resistant needs of different parts.

[0048] Includes the following steps:

[0049] S1: Determine the flow rate in the pouring pipe ;

[0050] S2: Deflection angle of the valve plate based on the flow velocity Perform calculations;

[0051] S3: Based on the calculated deflection angle Adjust the valve plate until the angle sensor reading matches the calculated deflection angle. correspond.

[0052] The specific process of step S2 includes:

[0053] The deflection angle of the valve plate is calculated as follows:

[0054]

[0055] in, Indicates flow rate. Indicates the angle of deflection;

[0056] Based on the principle of flow control, there is a non-linear relationship between the deflection angle and the water flow rate. The functional form of the flow characteristic curve of the valve plate is:

[0057] ;

[0058] in, Represents a constant. This indicates the performance parameters of the valve plate.

[0059] The flow rate when the valve plate is fully open is Then we have:

[0060]

[0061] Right now:

[0062]

[0063] At this point, the flow characteristic curve is described as follows:

[0064]

[0065] Given a flow Solve for the corresponding valve plate deflection angle. ,Right now:

[0066] ;

[0067] in, This represents the arcsine function. Calculators or mathematical software can be used for calculations. If the precise flow characteristic curve of the valve plate cannot be determined, trial calculations and adjustments can be made until the target flow rate is achieved.

[0068] When the angle Less than 1 hour, Take a value between 1.5 and 2.5, where, This indicates the deflection angle in radians. When calculating the valve plate deflection angle, the actual situation may be affected by various factors such as pipeline friction, molten iron flow velocity, and pressure. On-site measurement and adjustment are necessary to ensure the valve plate's control effect. Furthermore, regular inspection and maintenance of the valve plate, and timely cleaning of scale and other substances from the valve plate and pipeline, can help maintain the normal operation and control accuracy of the valve plate.

[0069] When molten iron is injected into the casting mold 8 through the pouring pipe 3, it is necessary to ensure that the flow rate of the pouring pipe 3 gradually increases from 0 at the beginning and gradually returns to 0 in the later stage of pouring. During this process, if it is necessary to maintain the uniform up-and-down movement of the third hydraulic component 203, the valve plate should reach the preset maximum deflection angle when the pouring process into the casting mold 8 is exactly halfway complete. At this point, the flow rate reaches its maximum. Different casting molds 8 will be used at different stages of factory production. Based on the required capacity of the casting mold 8, the volume of molten iron needed is calculated. .at this time That is, a given flow rate Solve for the corresponding valve plate deflection angle. According to the constant speed of the third hydraulic component 203 Through multiple experiments, it can be determined that the valve plate can achieve an angle of deviation. Duration required And according to the uniform movement speed of the third hydraulic component 203 and duration The distance traveled was calculated. Therefore, by setting the controller program, the third hydraulic component 203 is made to move a distance of [missing information]. To achieve valve plate deflection angle It works in conjunction with a cascaded hydraulic mechanism.

[0070] Based on Example 1, this example presents a specific working principle of a high-purity pig iron casting system.

[0071] The specific implementation principle and process are as follows:

[0072] The relationship between the rotation angle of valve plate 601 and the molten iron flow rate is obtained based on the angle sensor. The time required for a single pour is calculated based on the molten iron flow rate at the outlet of pouring pipe 3 and the capacity of casting mold 8. The start-stop interval of conveying mechanism 4 is set based on this time, and the distance traveled per start is set based on the distance between any two casting molds 8. The cascaded hydraulic mechanism is equipped with a controller. By setting the controller program, the second hydraulic component 202 performs periodic up-and-down movements, the cycle of which is coordinated with the start-stop cycle of conveying mechanism 4.

[0073] First, the conveying mechanism 4 starts operating. After reaching a predetermined distance, the conveying mechanism 4 stops, with any one of the casting molds 8 directly below the pouring pipe 3. At this time, the first hydraulic component 201 and the second hydraulic component 202 are in a contracted state, as are the second hydraulic component 202 and the third hydraulic component 203. Next, the second hydraulic component 202 moves downwards. During this movement, the second hydraulic component 202 and the third hydraulic component 203 remain in a contracted state, causing the stop rod 7 to continuously press against the control plate 602, thus blocking the molten iron in the pouring pipe 3 with the valve plate 601. When the second hydraulic component 202 reaches its maximum distance, the bottom surface of the pouring pipe 3 just touches the bottom surface of the casting mold 8. At this point, the second hydraulic component 202 moves upwards at a constant speed, and the third hydraulic component 203 moves downwards at a constant speed, with the second hydraulic component 202 moving faster than the third hydraulic component 203. At this time, the bottom surface of the pouring pipe 3 will continue to move slowly upward. During the movement, due to the separation between the second hydraulic component 202 and the third hydraulic component 203, the control plate 602 moves away from the abutment 7, and the valve plate 601 slowly opens, allowing the molten iron to begin pouring and the flow rate to increase. When the bottom of the pouring pipe 3 moves to the middle section of the casting mold 8, the flow rate in the pouring pipe 3 reaches its maximum value. At this time, the second hydraulic component 202 stops moving, and the third hydraulic component 203 stops moving away from the second hydraulic component 202 and begins to move upward in the opposite direction. That is, the second hydraulic component 202 and the third hydraulic component 203 contract, causing the abutment 7 to cooperate with the balance valve 6 again, so that the flow rate in the pouring pipe 3 gradually decreases until the bottom surface of the pouring pipe 3 is flush with the top surface of the casting mold 8, at which point the flow rate in the pouring pipe 3 is zero. After the casting mold 8 is poured, the second hydraulic component 202 moves upward. The distance it moves ensures that the bottom surface of the pouring pipe 3 does not touch the top surface of the casting mold 8. When the second hydraulic component 202 stops moving, one cycle of operation is completed.

[0074] In summary, the cyclical operation of any casting mold 8 is as follows: A casting mold that has just completed the pouring operation moves forward with the conveyor mechanism 4. When the empty casting mold behind this mold is directly below the pouring pipe 3, the conveyor mechanism 4 stops. The second hydraulic component 202 moves downward until the bottom surface of the pouring pipe 3 touches the bottom surface of the mold plate of the casting mold 8. At this time, the operation of the hydraulic mechanism 2 ensures that there is no pouring drop between the pouring pipe 3 and the casting mold 8, thus preventing molten steel from splashing. At the same time, during the pouring process, the flow rate of molten iron gradually increases and then decreases again, which ensures speed control in the early and late stages of pouring to protect product quality, and also allows for an increase in pouring speed in the middle stage to ensure higher production efficiency.

[0075] When the cast iron mold 8, after being poured, moves to the discharge end of the die head, the surface of the high-purity pig iron block is cooled by air cooling and bottom water spraying. The cast iron mold 8 continues to circulate around the conveyor mechanism 4, and the automatic mold releaser strikes the back of the mold to help release the high-purity pig iron block. The empty mold returns to the pouring point at the bottom of the pouring pipe 3, and the cast iron mold 8 is poured with molten iron again, achieving a cyclical and repeated iron casting process.

[0076] The automated intelligent control system, temperature control system, monitoring system, flow rate regulation system, and mold monitoring system involve sensors and real-time monitoring technology, automatic adjustment of pouring parameters (such as pouring speed and pressure), temperature sensors and feedback control algorithms, image processing and machine vision technology, spectral analyzers, gas analyzers, metallographic microscopes, acoustic emission detectors, and other equipment or technologies. These integrated systems require significant financial investment in procurement, research and development, and maintenance, greatly increasing the operational burden on enterprises. In contrast, this invention significantly reduces manpower and the investment and maintenance of the aforementioned equipment and systems, achieving cost reduction and efficiency improvement.

[0077] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A flow control method for a high-purity pig iron casting system, comprising a molten iron chute (1), a hydraulic mechanism (2), a pouring pipe (3), and a conveying mechanism (4), characterized in that: The hydraulic mechanism (2) is a cascaded hydraulic mechanism, which includes a first hydraulic component (201), a second hydraulic component (202) controlled by the first hydraulic component (201), and a third hydraulic component (203) controlled by the second hydraulic component (202). The top end of the first hydraulic component (201) is fixed, and the movement trajectories of the second hydraulic component (202) and the third hydraulic component (203) are vertically downward. The pouring pipe (3) is vertically arranged and its top end is connected to the third hydraulic component (203). The molten iron chute (1) is guided by a guide... The upper end of the flow pipe (5) is connected to the upper end of the pouring pipe (3). A balance valve (6) is provided in the middle section of the pouring pipe (3). An angle sensor is installed on the balance valve (6). The balance valve (6) includes a valve plate (601) inside the pipe and a control plate (602) outside the pipe. A vertical push rod (7) is installed on the second hydraulic component (202). The push rod (7) is in contact with the control plate (602). Several casting molds (8) are provided on the conveying mechanism (4). The bottom end of the pouring pipe (3) is guided to any one of the casting molds (8). The method includes the following steps: S1: Determine the flow rate in the pouring pipe; S2: Calculate the deflection angle of the valve plate based on the flow velocity; S3: Adjust the valve plate according to the calculated deflection angle until the displayed value of the angle sensor corresponds to the calculated deflection angle; First, the conveying mechanism (4) starts operating. After reaching the predetermined distance, when the conveying mechanism (4) stops, any casting mold (8) is located directly below the pouring pipe (3). At this time, the first hydraulic component (201) and the second hydraulic component (202) are in a contracted state, and the second hydraulic component (202) and the third hydraulic component (203) are in a contracted state. Then, the second hydraulic component (202) moves downward. During the movement, the second hydraulic component (202) and the third hydraulic component (203) are always in a contracted state, which makes the push rod (7) always abut against the control plate (602), so that the molten iron in the pouring pipe (3) is blocked by the valve plate (601). When the second hydraulic component (202) moves to the longest distance, the bottom surface of the pouring pipe (3) just touches the bottom surface of the template of the casting mold (8). At this time, the second hydraulic component (202) moves upward at a constant speed, and the third hydraulic component (203) moves downward at a constant speed. The moving speed of the first hydraulic component (202) is greater than that of the third hydraulic component (203). At this time, the bottom surface of the pouring pipe (3) will still move slowly upward. During the movement, due to the separation between the second hydraulic component (202) and the third hydraulic component (203), the control plate (602) moves away from the push rod (7), and the valve plate (601) opens slowly, so that the molten iron begins to be poured and the flow rate increases. When the bottom of the pouring pipe (3) moves to the middle section of the casting mold (8), the flow rate in the pouring pipe (3) reaches the maximum value. At this time, the second hydraulic component (202) stops moving, and the third hydraulic component (203) stops moving away from the second hydraulic component (202) and starts to move upward in the opposite direction. That is, the second hydraulic component (202) and the third hydraulic component (203) contract, so that the push rod (7) cooperates with the balance valve (6) again, so that the flow rate in the pouring pipe (3) gradually decreases until the bottom surface of the pouring pipe (3) is flush with the top surface of the casting mold (8), and the flow rate in the pouring pipe (3) is zero.

2. The flow control method for a high-purity pig iron casting system according to claim 1, characterized in that: The cross-sectional structure of the valve plate (601) is adapted to the inner cavity cross-section of the casting pipe (3).

3. The flow control method for a high-purity pig iron casting system according to claim 1, characterized in that: The guide pipe (5) includes a first pipe (501) connected to the molten iron chute (1) and a second pipe (502) connected to the casting pipe (3), wherein the first pipe (501) and the second pipe (502) are movably connected.

4. The flow control method for a high-purity pig iron casting system according to claim 1, characterized in that: The total length of the cascaded hydraulic mechanism is greater than the distance from the top surface of the first hydraulic component (201) to the top surface of the transmission mechanism (4).

5. The flow control method for a high-purity pig iron casting system according to claim 1, characterized in that: It also includes a ladle (9) for transporting molten iron, and a tilting device (10) is provided on one side of the ladle (9) for lifting the ladle (9) and tilting it to guide it into the molten iron chute (1).

6. The flow control method for a high-purity pig iron casting system according to claim 1, characterized in that: The casting pipe (3), the balancing valve (6), the conveying mechanism (4), and the guide pipe (5) are all made of refractory materials.

Images