A control system and method for preventing molten iron from spilling out of a molten iron ladle

Abstract

This invention relates to a control system for preventing molten iron overflow during ladle discharge. The system includes a furnace platform with a molten iron trough and two sets of rails passing beneath the furnace platform. A swing chute is located below the outlet of the molten iron trough. Ladle cars are mounted on the two sets of rails, each carrying a molten iron ladle. Each set of rails has a molten iron discharge station located below the swing chute. A ladle car position sensor is installed beside each discharge station on the rails to detect whether the ladle car is in position. A rail weighing scale is installed at each discharge station, and a radar level gauge is installed above the discharge station to detect the liquid level in the molten iron ladle. This invention provides a control system for preventing molten iron overflow during ladle discharge, achieving accurate control of the discharge amount. It can remind workers to switch discharge lines in a timely manner and can automatically switch lines if workers do not make adjustments, reducing the risk of excessive molten iron overflow damaging the ladle and ladle car, and ensuring safe production.

Description

Technical Field

[0001] This invention relates to the field of ironmaking technology, and in particular to a control system and method for preventing molten iron from overflowing when pouring molten iron from a ladle. Background Technology

[0002] During the tapping process in an ironmaking blast furnace, molten iron flows into a ladle. Typically, tapping from one tap occupies two railway lines. The ladles on both lines are aligned. After one ladle is filled, the molten iron is transferred to the other line via a swing chute to continue tapping. The previous ladle is moved forward by an iron jack to align with the next ladle, and tapping continues. Currently, tapping is mainly monitored through observation holes. When a ladle is full, the next one is moved. However, this method suffers from significant deviations in tapping volume, is greatly affected by liquid level detection, and is prone to errors due to manual observation, making accurate control of the tapping amount impossible. Furthermore, some employees make mistakes while on duty, failing to properly monitor the ladles, resulting in excessive tapping or misalignment. This can lead to molten iron overflowing, burning ladle cars and railway tracks, and even causing accidents such as ladle cars becoming immobile, preventing further tapping, and resulting in production interruptions due to the molten iron being blocked. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a control system and method for preventing molten iron from overflowing when discharging molten iron from a ladle, so as to achieve accurate control of the amount of molten iron discharged, reduce the risk of excessive molten iron overflowing and burning the ladle and car, and ensure safe production.

[0004] The present invention is implemented using the following scheme: a control system for preventing molten iron from overflowing during the discharge of molten iron from a ladle, comprising a furnace platform with a molten iron trough and two sets of rail lines passing below the furnace platform. A swing chute is provided below the outlet end of the molten iron trough. Ladle cars are respectively provided on the two sets of rail lines, and molten iron ladles are placed on the ladle cars. Molten iron discharge stations are respectively provided on the two sets of rail lines below the swing chute. A ladle car position sensor is provided on the side of the molten iron discharge station on the rail line to detect whether the ladle car is in position. A rail weighing scale is provided on the rail line at the molten iron discharge station. A radar level gauge is provided above the molten iron discharge station to detect the liquid level height in the molten iron ladle.

[0005] Furthermore, the swing chute is driven to rotate by a drive motor through a reducer and a transmission device.

[0006] Furthermore, the drive device includes a crank fixedly connected to the power input shaft of the reducer, and a connecting rod connecting the crank and the swing chute.

[0007] Furthermore, the power input shaft of the reducer is also fixedly connected to an indicator plate for indicating the rotation angle of the power input shaft. Three induction switches are provided on the side of the indicator plate to sense the angle position of the indicator plate and correspond to three different positions of the swing chute.

[0008] Furthermore, it also includes a central control unit, and the drive motor, tanker position sensor, rail weighing scale, radar level gauge and inductive switch are all electrically connected to the central control unit; the central control unit is also connected to a display screen and an alarm.

[0009] Another technical solution of the present invention: a control method for preventing molten iron from overflowing during molten iron ladle discharge, employing the control system for preventing molten iron from overflowing during molten iron ladle discharge as described above. A ladle car position sensor detects and confirms that both sets of ladle cars on the rail lines are pulled to the molten iron discharge station. The swing chute swings to align with the molten iron ladle at one side of the molten iron discharge station. The tap is opened to discharge molten iron, which flows into the molten iron ladle through the molten iron ditch and the swing chute. A rail weighing scale obtains the weight of the molten iron placed into the ladle. A radar level gauge detects the molten iron level in the ladle. When the molten iron level in the ladle reaches the required level and / or the weight of the molten iron placed reaches the required level, an alarm signal is sent. Simultaneously, the central control unit controls the drive motor to drive the swing chute to swing to align with the molten iron ladle at the other side of the molten iron discharge station to continue the molten iron discharge operation.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The control system of the present invention prevents molten iron from overflowing when releasing molten iron from the ladle, realizes accurate control of the amount of molten iron released, can remind workers to switch the line for releasing molten iron in time, and can automatically switch the line when the workers have not made the adjustment, reducing the risk of molten iron overflowing and burning the molten iron ladle and ladle car, and ensuring safe production.

[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0012] Figure 1 This is a side view of the overall structure of an embodiment of the present invention (a schematic diagram of a single-sided molten iron discharge station). Figure 2 This is a schematic diagram of the inductive switch and indicator panel according to an embodiment of the present invention; Figure 3 This is a circuit block diagram of an embodiment of the present invention; The following are the labels in the diagram: 1-Central control unit, 2-Display screen, 3-Iron trough, 4-Radar level gauge, 5-Transmission device, 6-Swing chute, 7-Iron ladle, 8-Ladle car, 9-Railway weighing scale, 10-Ladle car position sensor, 11-Indicator board, 12-Inductive switch, 13-Reducer. Detailed Implementation

[0013] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0014] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0015] like Figures 1-3 As shown, a control system for preventing molten iron from overflowing during molten iron ladle discharge includes a furnace platform with a molten iron trough and two sets of rail lines passing under the furnace platform. The inlet end of the molten iron trough is connected to the blast furnace, and a swing chute 6 is provided below the outlet end of the molten iron trough. Ladle cars 8 are respectively provided on the two sets of rail lines, and molten iron ladles 7 are provided on the ladle cars. Molten iron discharge stations are respectively provided on the two sets of rail lines below the swing chute. Ladle car position sensors 10 (namely, ladle car position sensor 1 and ladle car position sensor 2) are provided on the rail lines next to the molten iron discharge stations to detect whether the ladle cars are in position. Rail weighing scales (namely, rail weighing scale 1 and rail weighing scale 2) are provided on the rail lines at the molten iron discharge stations. Radar level gauges (namely, radar level gauge 1 and radar level gauge 2) are provided above the molten iron discharge stations to detect the liquid level height in the molten iron ladle.

[0016] The rail weighing system solves the problem of large deviations in the amount of molten iron discharged from each ladle. By weighing each ladle, the total weight minus the weight of the empty ladle is the weight of the discharged iron, thus avoiding exceeding the weight limit and the maximum amount that the molten iron ladle can actually hold, and preventing molten iron from spilling and burning the ladle car and railway.

[0017] There are also situations where there are many impurities and slag in the ladle when molten iron is poured out. The actual weight is not the required weight, but the slag in the ladle has reached the specified height in the molten iron ladle. A radar level gauge is installed and works in conjunction with a rail weighing scale to prevent molten iron from overflowing and burning the ladle car and railway.

[0018] In this embodiment, the swing chute is driven to rotate by a drive motor through a reducer 13 and a transmission device 5.

[0019] In this embodiment, the driving device includes a crank fixedly connected to the power input shaft of the reducer, and a connecting rod is connected between the crank and the swing chute.

[0020] In this embodiment, the power input shaft of the reducer is also fixedly connected to an indicator plate 11 for indicating the rotation angle of the power input shaft. Three induction switches 12 (induction switch 1, induction switch 2, and induction switch 3) are provided on the side of the indicator plate to sense the angle position of the indicator plate and correspond to three different positions of the swing chute, respectively, namely the middle position, the iron pouring station facing left, and the iron pouring station facing right.

[0021] In this embodiment, a central control unit is also included. The drive motor, tank car position sensor, rail weighing scale, radar level gauge, and inductive switch are all electrically connected to the central control unit. The central control unit is also connected to a display screen and an alarm. An alarm for detecting molten iron loading is set up to promptly remind the user that the required amount of molten iron has been loaded, allowing for timely replacement to avoid overloading. The circuit structure described above is prior art and belongs to conventional technology that is easily conceived by those skilled in the art; therefore, its structure and principle will not be specifically described here.

[0022] A control method for preventing molten iron overflow during ladle discharge employs the control system described above. During production, a ladle car position sensor detects and confirms that both sets of rails containing empty molten iron ladles are towed to the molten iron discharge station. A signal detection interlock alerts the system; if a ladle car is not simultaneously present at the molten iron discharge station on both sets of rails, an alarm continues. The swing chute swings to align with the molten iron ladle at the discharge station on one side (i.e., the left). The blast furnace taphole is opened to discharge molten iron, which flows through the molten iron chute and the swing chute. The molten iron flows into the ladle via a moving chute. A track-mounted weighing scale obtains the weight of the molten iron placed into the ladle. A radar level gauge detects the molten iron level in the ladle. When the molten iron level in the ladle reaches the required level and / or the weight of the molten iron placed reaches the required level, an alarm signal is sent. At the same time, the central control unit controls the drive motor to drive the swing chute to swing to align with the molten iron ladle on the other side (i.e., the right side) to continue the molten iron placement operation. The ladle car that has completed the molten iron placement on the left is towed forward, and the next ladle car with an empty molten iron ladle is towed to the left molten iron placement station.

[0023] The above detection, alarm, and interlocking systems allow on-site operators to monitor and adjust manual operations in real time. Any abnormalities detected will be promptly reported to other personnel for simultaneous emergency response. Workers will be reminded to switch tracks for molten iron release, and the system can automatically switch tracks even if workers haven't made adjustments. This reduces the risk of molten iron overflowing and burning the ladle and car, and resolves potential problems such as overflowing molten iron, misalignment of the ladle, and misalignment during molten iron loading, which could damage the car and railway.

[0024] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0025] If this invention discloses or relates to mutually fixedly connected components or structural parts, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0026] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0027] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A control system for preventing molten iron from overflowing when discharging molten iron from a ladle, characterized in that: The furnace platform includes a molten iron trough and two sets of rails passing beneath it. A swing chute is located below the outlet of the molten iron trough. Ladle cars are mounted on the two sets of rails, and molten iron ladles are placed on the ladle cars. Molten iron discharge stations are located below the swing chute on the two sets of rails. A ladle car position sensor is installed next to the molten iron discharge station on the rails to detect whether the ladle car is in position. A rail weighing scale is installed at the molten iron discharge station on the rails. A radar level gauge is installed above the molten iron discharge station to detect the liquid level in the molten iron ladle.

2. The control system for preventing molten iron from overflowing when discharging molten iron from a ladle according to claim 1, characterized in that: The swing chute is driven to rotate by a drive motor through a reducer and a transmission device.

3. The control system for preventing molten iron from overflowing during ladle discharge according to claim 2, characterized in that: The drive device includes a crank fixedly connected to the power input shaft of the reducer, and a connecting rod connecting the crank and the swing chute.

4. The control system for preventing molten iron from overflowing when discharging molten iron from a ladle according to claim 2, characterized in that: The power input shaft of the reducer is also fixedly connected to an indicator plate for indicating the rotation angle of the power input shaft. Three induction switches are provided on the side of the indicator plate to sense the angle position of the indicator plate and correspond to three different positions of the swing chute.

5. The control system for preventing molten iron from overflowing when discharging molten iron from a ladle according to claim 4, characterized in that: It also includes a central control unit, and the drive motor, tanker position sensor, rail weighing scale, radar level gauge and inductive switch are all electrically connected to the central control unit; the central control unit is also connected to a display screen and an alarm.

6. A control method for preventing molten iron from overflowing when releasing molten iron from a ladle, comprising the control system for preventing molten iron from overflowing when releasing molten iron from a ladle as described in claim 4, characterized in that: The position sensors of the ladle cars confirm that both sets of rail cars have been towed to the molten iron discharge station. The swing chute swings to align with the molten iron ladle on one side of the molten iron discharge station. The tap is opened to discharge molten iron, which flows into the molten iron ladle through the molten iron ditch and the swing chute. The rail weighing scale obtains the weight of the molten iron placed into the molten iron ladle. The radar level gauge detects the molten iron level in the molten iron ladle. When the molten iron level in the molten iron ladle reaches the required level and / or the weight of the molten iron placed reaches the required level, an alarm signal is sent. At the same time, the central control unit controls the drive motor to drive the swing chute to swing to align with the molten iron ladle on the other side of the molten iron discharge station to continue the molten iron discharge operation.

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