Safety interlocking method for resetting of molten iron torpedo ladle

Abstract

The invention discloses a molten iron torpedo ladle resetting safety interlocking method, which comprises the following steps of: automatically calculating tipping times n1, resetting times n2, tipping time t1, resetting time t2 and a ratio K of t2 to t1 in the process of tipping molten iron in a torpedo ladle every time, and recording n1, n2, t1, t2 and K into a data table when the torpedo ladle is reset to a vertical position; a certain amount of tipping molten iron data is automatically stored, new data covers original data from the beginning, and circulation is conducted in sequence; after each time of data recording is completed, automatically calculating and recording a corresponding maximum value Kmax from the recorded data according to a defined tipping frequency range; and according to the number of times of current tipping, Kmax in a corresponding range is automatically read when the torpedo ladle is reset, then the Kmax is multiplied by a linkage coefficient i to serve as a linkage parameter of current resetting, and when K is larger than Kmax * i, resetting is stopped. The device has the advantages that the phenomenon of excessive resetting of the torpedo ladle is effectively avoided, molten iron is prevented from reversely flowing out, and potential safety hazards are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of molten iron tilting station equipment in steel mills, and particularly relates to a method for reset safety interlock of a torpedo ladle for molten iron. Background Technique

[0002] Under normal circumstances, molten iron from a blast furnace is transported to a steel mill by a torpedo ladle, and through a molten iron tilting station, the molten iron is tilted and poured into a molten iron ladle. The molten iron in the molten iron ladle is lifted by a crane to the front of a converter or an electric furnace and then poured into the furnace for smelting. Therefore, tilting the molten iron in the torpedo ladle is a key link in steelmaking.

[0003] The tilting of the torpedo ladle is generally driven by a wound motor. When the motor starts, a resistor is connected to increase the tilting torque, and after tilting, the resistor is cut off by a time relay for normal driving. The tilting and resetting of the torpedo ladle are generally carried out through a selection switch on the console. There are tilting over-limit limit switches and vertical position limit switches designed on the torpedo ladle car for interlock protection to avoid excessive tilting and resetting and prevent abnormal falling of molten iron. However, these signals are connected to the ground control system through plugs and sockets, so the situation of interlock signal loss inevitably occurs. For example, if the vertical position limit signal is lost, it is possible for the torpedo ladle to be over-reset, resulting in molten iron flowing out of the ladle mouth and falling to the ground, causing serious accidents. Therefore, it is particularly crucial to improve the reset safety interlock of the torpedo ladle for molten iron. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of easy loss of interlock signals during the reset of the existing torpedo ladle, excessive reset resulting in molten iron flowing out, and large safety hazards. A method for reset safety interlock of a torpedo ladle for molten iron is provided. According to the collected and recorded data of tilting and resetting of the torpedo ladle, the reset interlock signal after tilting the molten iron in the torpedo ladle is automatically calculated and generated, effectively avoiding the phenomenon of excessive reset of the torpedo ladle, preventing the reverse flow of molten iron, reducing safety hazards, and ensuring safe and effective reset.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A method for reset safety interlock of a torpedo ladle for molten iron, the specific steps are as follows: (1) During each process of tilting the molten iron in the torpedo ladle, the tilting times n1, reset times n2, tilting time t1, reset time t2, and the ratio K of the reset time to the tilting time are automatically calculated. And when the torpedo ladle is reset to the vertical position, n1, n2, t1, t2, and K of the current process of pouring molten iron in the torpedo ladle are recorded in the defined data table; (2) Automatically save a certain number of data of pouring molten iron. Let the total number of data of pouring molten iron be kept as N. When the data volume > N, the new data starts to overwrite the original data from the beginning and circulates in turn; (3) After each data recording is completed, according to the defined range of tipping times, automatically calculate and record the maximum value K of the ratio of the corresponding reset time to the tipping time from the recorded data. max ; (4) According to the number of times of the current tipping, when the torpedo ladle is reset, automatically read the maximum value K of the ratio of the reset time to the tipping time within the corresponding range. max , then multiply it by the interlock coefficient i to obtain the interlock parameter for this reset. When the ratio K of the reset time to the tipping time is greater than this interlock parameter K max * i, trigger the interlock signal to prohibit reset, and stop the reset action of the torpedo ladle.

[0006] Further, in the step (2), the total number N of the tipping hot metal data is set to 300 times, that is, n1~n 300 .

[0007] Further, in the step (3), the range of tipping times is successively set to 1~10, 11~20, 21~30, 31~40, 41~50, and >50.

[0008] Further, in the step (3), the maximum value K of the ratio of the reset time to the tipping time max successively includes K 1~10 , K 11~20 , K 21~30 , K 31~40 , K 41~50 , K ＞50 .

[0009] Further, in the step (4), the interlock coefficient i is set to 1.05.

[0010] Further, the control is implemented within the PLC and DCS control systems, and the aforementioned range of tipping times and interlock coefficient are adjusted according to the actual situation.

[0011] In the technical solution of the present invention, by collecting and recording the historical data of the tipping and reset of the torpedo ladle, automatically calculating and generating the reset interlock signal after the torpedo ladle tips the hot metal, it effectively improves the safety of the torpedo ladle reset, saves investment, saves working time, improves efficiency, and has an immediate effect on avoiding excessive reset of the torpedo ladle and preventing the reverse flow of hot metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the flowchart of the safety interlock control for the reset of the hot metal torpedo ladle of the present invention. DETAILED DESCRIPTION OF THE INVENTION EXAMPLE

[0013] To make the present invention more clear and understandable, the following further describes a method for reset safety interlock of a hot metal torpedo ladle in conjunction with the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] Refer to Figure 1 , a method for reset safety interlock of a hot metal torpedo ladle, which automatically calculates and generates a reset interlock signal after the torpedo ladle tilts to pour out hot metal according to the collected and recorded data of the torpedo ladle tilting and resetting, and is characterized in that: (1) During each process of the torpedo ladle tilting to pour out hot metal, automatically collect and calculate the relevant data of each tilting to pour out hot metal: the tilting times n1, the reset times n2, the tilting time t1 and the reset time t2, and the ratio K of the reset time to the tilting time; (2) When the torpedo ladle is reset to the vertical position, record n1, n2, t1, t2 and K of the current torpedo ladle pouring hot metal process into the defined data table. When recording to the 300th time, start from the beginning and sequentially overwrite the original data, and repeat the cycle to ensure that the recorded data are all the latest data; (4) After each data recording is completed, according to the defined range of tilting times, that is, tilting times 1 - 10, 11 - 20, 21 - 30, 31 - 40, 41 - 50, and >50, automatically calculate and record the maximum value K of the ratio of the corresponding reset time to the tilting time from the recorded data max ; (5) Each time when resetting, according to the number of tilting times of this time, automatically read the maximum value K of the ratio of the reset time to the tilting time in the corresponding range max , multiply it by the interlock coefficient i = 1.05 as the interlock parameter for this reset; (6) When the ratio K of the reset time to the tilting time is greater than this interlock parameter K max * i, trigger the interlock signal to prohibit resetting and stop the reset action of the torpedo ladle.

[0015] In this embodiment, the reset safety interlock control of the hot metal torpedo ladle is implemented in control systems such as PLC and DCS. The above-mentioned range of tilting times and interlock coefficient can be adjusted according to actual situations.

[0016] The method of the present invention automatically calculates and generates a reset interlock signal after the torpedo ladle tilts to pour out hot metal according to the collected and recorded data of the torpedo ladle tilting and resetting, which can effectively avoid the occurrence of malignant accidents such as excessive reset of the torpedo ladle and reverse outflow of hot metal.

[0017] Except for the above embodiments, the present invention can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A method for the reset safety interlock of a torpedo ladle for hot metal, characterized in that: (1) During each process of tilting the torpedo ladle to pour hot metal, the tilting times n1, reset times n2, tilting time t1, reset time t2, and the ratio K of the reset time to the tilting time are automatically calculated. And when the torpedo ladle is reset to the vertical position, n1, n2, t1, t2, and K of the current hot metal pouring process of the torpedo ladle are recorded in the defined data table. (2) Automatically save a certain number of hot metal pouring data. Let the total number of hot metal pouring data be N. When the data volume > N, the new data starts to overwrite the original data from the beginning and cycles in turn. (3)After each data recording is completed, according to the defined range of the number of tip-overs, automatically calculate and record the maximum value K of the ratio of the corresponding reset time to the tip-over time from the recorded data max ; (4)According to the number of times of this tipping, when the torpedo ladle is reset, the maximum value K of the ratio of the reset time to the tipping time within the corresponding range is automatically read max , and then multiplied by the interlock coefficient i to obtain the interlock parameter for this reset. When the ratio K of the reset time to the tipping time is greater than this interlock parameter K max *i, a chain signal to prohibit reset is triggered, and the reset operation of the torpedo ladle is stopped.

2. The method for the reset safety interlock of a torpedo ladle for hot metal according to claim 1, characterized in that: In the step (2), the total number N of the molten iron tipping data is set to 300 times, that is, n1~n 300 .

3. The method for the reset safety interlock of a torpedo ladle for hot metal according to claim 2, characterized in that: In the step (3), the tilting times ranges are set as 1 - 10, 11 - 20, 21 - 30, 31 - 40, 41 - 50, and > 50 in turn.

4. The method for the reset safety interlock of a torpedo ladle for hot metal according to claim 3, characterized in that: In the said step (3), the maximum value K of the ratio of the reset time to the tipping time max successively includes K 1~10 , K 11~20 , K 21~30 , K 31~40 , K 41~50 , K ＞50 .

5. The method for the reset safety interlock of a torpedo ladle for hot metal according to any one of claims 1 - 4, characterized in that: In the step (4), the interlock coefficient i is set as 1.

05.

6. The method for the reset safety interlock of a torpedo ladle for hot metal according to any one of claims 1 - 4, characterized in that: The control is implemented within the PLC and DCS control systems, and the aforementioned tilting times range and interlock coefficient are adjusted according to the actual situation.

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