A method for automatically controlling the liquid level of a continuous casting tundish

Abstract

The present invention discloses a method for automatic control of the liquid level of a continuous casting tundish, and the first furnace casting control includes: opening the slide of the continuous casting tundish according to a first preset time interval and a first preset speed, judging whether the first preset condition is met, and if so, executing the next step; opening the slide of the continuous casting tundish according to a second preset time interval and a second preset speed, judging whether the second preset condition is met, and if so, executing the next step; closing the slide of the continuous casting tundish according to a third preset time interval and a third preset speed, judging whether the third preset condition is met, and if so, executing the next step; closing the slide of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, judging whether the fourth preset condition is met, and if so, ending the operation, otherwise executing the next step; judging whether the fifth preset condition is met, and if so, opening the slide of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, otherwise executing the previous step.

Description

Technical Field

[0001] The invention relates to an automatic control method for liquid level of a continuous casting tundish, belonging to the technical field of automatic control. Background Art

[0002] Continuous steel casting is the process of continuously pouring high-temperature molten steel into ingots with a defined cross-sectional shape and dimensions. The equipment required to complete this process is called a continuous casting system. The core equipment of continuous steel casting, comprising the electromechanical and hydraulic integration of the steel pouring equipment, the continuous casting machine itself, the cutting area, and the dummy rod collection and conveying equipment, is known as the continuous casting machine. The tundish is a refractory container between the continuous casting ladle and the crystallizer. Conventional technology manually controls the molten steel level within the tundish of the continuous casting machine by operating the pouring cylinder switch. This creates a harsh working environment and presents safety risks. Furthermore, manual control results in poor tundish level stability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for automatic control of the liquid level of a continuous casting ladle. The present invention mainly utilizes the original weighing device on the ladle car to compile an automatic control process, and automatically calculates and controls the opening degree, opening time and switching times of the ladle sliding nozzle through the program, stabilizes the weight of the molten steel in the ladle, and keeps the molten steel level in the ladle at a constant position for a long time, thereby achieving the purpose of improving the quality of continuous casting slabs.

[0004] Preferably, the present invention provides a method for automatically controlling the liquid level of a continuous casting tundish, wherein the first furnace pouring control comprises:

[0005] Opening the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, determining whether a first preset condition is met, and if so, executing the next step, and if not, repeating the present step;

[0006] Opening the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, determining whether a second preset condition is met, and if so, executing the next step, and if not, repeating the present step;

[0007] closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, and determining whether a third preset condition is met, if so, executing the next step, and if not, repeating the present step;

[0008] closing the slide plate of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, and determining whether a fourth preset condition is met, and if so, terminating the operation, otherwise executing the next step;

[0009] Determine whether the fifth preset condition is met. If so, open the slide of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed. Otherwise, execute the previous step.

[0010] Preferably, the non-first furnace pouring control includes:

[0011] opening the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, determining whether a sixth preset condition is met, and if so, executing the next step;

[0012] opening the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, determining whether the seventh preset condition is met, and if so, executing the next step;

[0013] closing the slide plate of the continuous casting tundish according to an eighth preset time interval and an eighth preset speed, and determining whether an eighth preset condition is met, and if so, terminating the operation, otherwise executing the next step;

[0014] Determine whether a ninth preset condition is met; if so, close the slide of the continuous casting tundish according to a ninth preset time interval and a ninth preset speed; otherwise, execute the previous step.

[0015] Preferably, the first preset condition includes that the tundish weight M is greater than a first preset weight threshold, and the tundish weight change rate Kt is greater than a second preset threshold;

[0016] Open the slide of the continuous casting tundish according to the first preset time interval and the first preset speed, and determine whether the weight M of the tundish meets the first preset condition. If so, execute the next step; otherwise, repeat this step.

[0017] Preferably, the second preset condition includes that the tundish weight M is greater than the third preset weight threshold, and the tundish weight change rate Kt is greater than the fourth preset threshold; the third preset weight threshold is 40 tons, and the fourth preset threshold is 0.2.

[0018] Open the slide of the continuous casting tundish according to the second preset time interval and the second preset speed, and determine whether the weight M of the tundish meets the second preset condition. If so, execute the next step; otherwise, repeat the step.

[0019] Preferably, the third preset condition includes that the tundish weight M is greater than the fifth preset weight threshold, and the tundish weight change rate Kt is less than the sixth preset threshold;

[0020] Close the slide of the continuous casting tundish according to the third preset time interval and the third preset speed, and determine whether the weight M of the tundish meets the third preset condition. If so, execute the next step; otherwise, repeat this step.

[0021] Preferably, the fourth preset condition includes that the tundish weight M is greater than the seventh preset weight threshold, and 0<tundish weight change rate Kt<eighth preset threshold.

[0022] Preferably, the fifth preset condition includes that the tundish weight change rate Kt is less than a ninth preset threshold;

[0023] Open the slide plate of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, and determine whether the weight M of the tundish meets the fifth preset condition. If not, execute the previous step.

[0024] Preferably, the first preset weight threshold is 20 tons, and the second preset threshold is 0.1.

[0025] Preferably, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the methods described in the first aspect when executing the program.

[0026] Preferably, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any one of the methods described in the first aspect when executed by a processor.

[0027] The beneficial effects achieved by the present invention are:

[0028] The present invention mainly utilizes the original weighing device on the ladle car, and automatically calculates and controls the opening degree, opening time and opening and closing times of the ladle sliding nozzle through a program, thereby stabilizing the weight of the molten steel in the tundish and keeping the molten steel level in the tundish at a constant position for a long time, thereby achieving the purpose of improving the quality of continuous casting slabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a flow chart of the first furnace pouring control in some embodiments of the present application;

[0031] Figure 2 This is a flow chart of non-first furnace pouring control in some embodiments of the present application; DETAILED DESCRIPTION

[0032] See also Figure 1 The present application discloses a method for automatically controlling the liquid level of a continuous casting tundish, wherein the first furnace pouring control includes:

[0033] Opening the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, determining whether a first preset condition is met, and if so, executing the next step, and if not, repeating the present step;

[0034] Opening the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, determining whether a second preset condition is met, and if so, executing the next step, and if not, repeating the present step;

[0035] closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, and determining whether a third preset condition is met, if so, executing the next step, and if not, repeating the present step;

[0036] closing the slide plate of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, and determining whether a fourth preset condition is met; if so, terminating the operation and switching to automatic control of the tundish liquid level; otherwise, executing the next step;

[0037] Determine whether the fifth preset condition is met. If so, open the slide of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed. Otherwise, execute the previous step.

[0038] See also Figure 2 , non-first furnace pouring control includes:

[0039] opening the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, determining whether a sixth preset condition is met, and if so, executing the next step;

[0040] opening the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, determining whether the seventh preset condition is met, and if so, executing the next step;

[0041] closing the slide plate of the continuous casting tundish according to an eighth preset time interval and an eighth preset speed, and determining whether the eighth preset condition is met; if so, terminating the operation and switching to automatic control of the tundish liquid level; otherwise, executing the next step;

[0042] Determine whether the ninth preset condition is met. If so, close the slide plate of the continuous casting tundish according to the ninth preset time interval and the ninth preset speed; otherwise, execute the previous step. In the present application, the sixth preset time interval is 1 second / time, the sixth preset condition includes the tundish weight M>40 tons and the tundish weight change rate Kt>0.05, the seventh preset time interval is 0.5 seconds / time, the seventh preset condition includes the tundish weight M>40 tons and the tundish weight change rate Kt>0.1, the eighth preset time interval is 0.5 seconds / time, the eighth preset condition includes the tundish weight M>65 tons and 0.05>tundish weight change rate Kt>0, the ninth preset time interval is 0.5 seconds / time, and the ninth preset condition includes 0>tundish weight change rate Kt.

[0043] In this embodiment, the first preset condition includes the tundish weight M being greater than a first preset weight threshold and the tundish weight change rate Kt being greater than a second preset threshold. In this embodiment, the first preset time interval is 1 second per operation, the first preset weight threshold is 20 tons, the second preset threshold is 0.1, and the sampling frequency for the tundish weight change rate Kt is 2 seconds. The automatic tundish level control transfer capacity is 65 tons. During each initial reverse movement of the slide, the slide gap is used to compensate for the on / off time. Manual control can be switched to in abnormal situations, such as a sudden reduction in pulling speed.

[0044] Open the slide of the continuous casting tundish according to the first preset time interval and the first preset speed, and determine whether the weight M of the tundish meets the first preset condition. If so, execute the next step; otherwise, repeat this step.

[0045] In an embodiment of the present application, the second preset time interval is 0.5 seconds per time, and the second preset conditions include that the intermediate ladle weight M is greater than the third preset weight threshold, and the intermediate ladle weight change rate Kt is greater than the fourth preset threshold; the third preset weight threshold is 40 tons, and the fourth preset threshold is 0.2.

[0046] Open the slide of the continuous casting tundish according to the second preset time interval and the second preset speed, and determine whether the weight M of the tundish meets the second preset condition. If so, execute the next step; otherwise, repeat the step.

[0047] In the embodiment of the present application, the third preset time interval is 1 second per time, and the third preset condition includes that the tundish weight M is greater than the fifth preset weight threshold, and the tundish weight change rate Kt is less than the sixth preset threshold; the fifth preset weight threshold is 40 tons, and the sixth preset threshold is 0.15;

[0048] Close the slide of the continuous casting tundish according to the third preset time interval and the third preset speed, and determine whether the weight M of the tundish meets the third preset condition. If so, execute the next step; otherwise, repeat this step.

[0049] In the embodiment of the present application, the fourth preset time interval is 0.5 seconds per time, and the fourth preset condition includes that the tundish weight M is greater than the seventh preset weight threshold, 0 < tundish weight change rate Kt < the eighth preset threshold; the seventh preset weight threshold is 65 tons, and the eighth preset threshold is 0.05;

[0050] In the embodiment of the present application, the fifth preset time interval is 0.5 seconds per time, and the fifth preset condition includes that the tundish weight change rate Kt is less than a ninth preset threshold value; the ninth preset threshold value is 0;

[0051] Open the slide plate of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, and determine whether the weight M of the tundish meets the fifth preset condition. If not, execute the previous step.

[0052] In an embodiment of the present application, the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above methods when executing the program.

[0053] In an embodiment of the present application, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0054] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0055] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the claims.

[0056] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of this application in detail. It should be understood that the above are only specific implementation methods of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of this application should be included in the scope of protection of this application.

Claims

1. A method for automatic control of liquid level in a continuous casting tundish, characterized in that: The first furnace pouring control includes: Opening the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, determining whether a first preset condition is met, and if so, executing the next step, and if not, repeating the present step; Opening the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, determining whether a second preset condition is met, and if so, executing the next step, and if not, repeating the present step; closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, and determining whether a third preset condition is met, if so, executing the next step, and if not, repeating the present step; closing the slide plate of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, and determining whether a fourth preset condition is met, and if so, terminating the operation, otherwise executing the next step; Determine whether the fifth preset condition is met. If so, open the slide of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed. Otherwise, execute the previous step. The first preset condition includes that the tundish weight M is greater than a first preset weight threshold, and the tundish weight change rate Kt is greater than a second preset threshold. The first preset weight threshold is 20 tons, and the second preset threshold is 0.

1. The second preset condition includes that the tundish weight M is greater than the third preset weight threshold, and the tundish weight change rate Kt is greater than the fourth preset threshold, the third preset weight threshold is 40 tons, and the fourth preset threshold is 0.2; The third preset condition includes that the tundish weight M is greater than the fifth preset weight threshold, and the tundish weight change rate Kt is less than the sixth preset threshold, the fifth preset weight threshold is 40 tons, and the sixth preset threshold is 0.15; The fourth preset condition includes that the tundish weight M is greater than the seventh preset weight threshold, 0<tundish weight change rate Kt<eighth preset threshold, the seventh preset weight threshold is 65 tons, and the eighth preset threshold is 0.05; The fifth preset condition includes that the tundish weight change rate Kt is less than a ninth preset threshold value, and the ninth preset threshold value is zero.

2. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: Non-first furnace pouring control includes: opening the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, determining whether a sixth preset condition is met, and if so, executing the next step; opening the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, determining whether the seventh preset condition is met, and if so, executing the next step; closing the slide plate of the continuous casting tundish according to an eighth preset time interval and an eighth preset speed, and determining whether an eighth preset condition is met, and if so, terminating the operation, otherwise executing the next step; Determine whether a ninth preset condition is met; if so, close the slide of the continuous casting tundish according to a ninth preset time interval and a ninth preset speed; otherwise, execute the previous step.

3. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method according to any one of claims 1 to 2 are implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 2 are implemented.

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