Continuous casting tundish liquid level automatic control method

Abstract

The invention discloses a continuous casting tundish liquid level automatic control method, first furnace casting control comprises the steps of opening a sliding plate of a continuous casting tundish according to a first preset time interval and a first preset speed, judging whether a first preset condition is met or not, and if yes, executing the next step; a sliding plate of the continuous casting tundish is opened according to a second preset time interval and a second preset speed, whether a second preset condition is met or not is judged, and if yes, the next step is executed; closing a sliding plate of the continuous casting tundish according to a third preset time interval and a third preset speed, judging whether a third preset condition is met or not, and if yes, executing the next step; closing a sliding plate of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, judging whether a fourth preset condition is met or not, if yes, ending operation, and if not, executing the next step; and whether a fifth preset condition is met or not is judged, if yes, a sliding plate of the continuous casting tundish is opened according to a fifth preset time interval and a fifth preset speed, and if not, the previous step is executed.

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] The production process of continuously pouring high-temperature molten steel into ingots with a certain cross-sectional shape and certain size specifications is called continuous steel casting. The equipment required to complete this process is called a continuous casting equipment set. The electromechanical and hydraulic integration of steel pouring equipment, continuous casting machine main equipment, cutting area equipment, ingot rod collection and conveying equipment constitutes the core equipment of continuous steel casting, which is called a continuous casting machine. The tundish is a refractory container between the continuous casting ladle and the crystallizer. In conventional technology, the molten steel level in the tundish of the continuous casting machine is manually controlled by the operator by operating the pouring cylinder switch. The working environment is harsh and there are safety risks. In addition, manual control leads to poor stability of the molten steel level in the tundish. 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 tundish. The present invention mainly utilizes the original weighing device on the tundish car to compile an automatic control process, and automatically calculates and controls the opening of the ladle sliding water nozzle, the opening time of the ladle sliding water nozzle and the number of times the ladle sliding water nozzle is switched on and off through the 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.

[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: Open the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, and determine whether the first preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, and determine whether a second preset condition is met, and if so, execute the next step; Closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, determining whether a third preset condition is met, and if so, executing the next 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 plate of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, otherwise execute the previous step.

[0005] Preferably, the non-first furnace pouring control includes: Open the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, and determine whether the sixth preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, and determine whether the seventh preset condition is met, and if so, execute 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 the eighth preset condition is met, and if so, terminating the operation, otherwise executing the next step; 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.

[0006] 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; Open the slide plate of the continuous casting tundish at a preset time interval and a first preset speed, and determine whether the weight M of the tundish meets the first preset condition. If so, repeat this step.

[0007] 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.

[0008] Open the slide plate of the continuous casting tundish at a second preset time interval and a second preset speed to determine whether the weight M of the tundish meets a second preset condition. If so, repeat this step.

[0009] 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; Close the slide plate 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, repeat this step.

[0010] 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.

[0011] Preferably, the fifth preset condition includes that the tundish weight change rate Kt is less than a ninth preset threshold value; 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, repeat this step.

[0012] Preferably, the first preset weight threshold is 20 tons and the second preset weight threshold is 0.1.

[0013] 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.

[0014] Preferably, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0015] The beneficial effects achieved by the present invention are: The present invention mainly utilizes the original weighing device on the tundish car, and automatically calculates and controls the opening degree, opening time and switching 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

[0016] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 is a flow chart of the first furnace pouring control in some embodiments of the present application; Figure 2 is a flowchart of non-first furnace pouring control in some embodiments of the present application; DETAILED DESCRIPTION

[0018] 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: Open the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, and determine whether the first preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, and determine whether a second preset condition is met, and if so, execute the next step; Closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, determining whether a third preset condition is met, and if so, executing the next step; closing the slide plate of the continuous casting tundish according to a fourth preset time interval and a fourth preset speed, and judging 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; Determine whether the fifth preset condition is met, if so, open the slide plate of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, otherwise execute the previous step.

[0019] See also Figure 2 , non-first furnace pouring control includes: Open the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, and determine whether the sixth preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, and determine whether the seventh preset condition is met, and if so, execute 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 judging 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; 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 1S / 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 0.5S / 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 0.5S / 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 0.5S / time, and the ninth preset condition includes 0>tundish weight change rate Kt.

[0020] In the embodiment of the present application, the first preset condition includes that the weight M of the tundish is greater than the first preset weight threshold, and the weight change rate Kt of the tundish is greater than the second preset threshold; in the embodiment of the present application, the first preset time interval is 1 second / time, the first preset weight threshold is 20 tons, the second preset threshold is 0.1, and the sampling frequency of the weight change rate Kt of the tundish is 2 seconds. The automatic control handover tonnage of the tundish liquid level is 65 tons. Each time the slide plate moves in the opposite direction for the first time, the slide plate gap is used to compensate for the on / off time. Manual control can be switched in abnormal situations, such as sudden reduction in pulling speed.

[0021] Open the slide plate of the continuous casting tundish at a preset time interval and a first preset speed, and determine whether the weight M of the tundish meets the first preset condition. If so, repeat this step.

[0022] In an embodiment of the present application, the second preset time interval is 0.5 seconds per time, and the second preset condition includes 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.

[0023] Open the slide plate of the continuous casting tundish at a second preset time interval and a second preset speed to determine whether the weight M of the tundish meets a second preset condition. If so, repeat this step.

[0024] In the embodiment of the present application, the third preset time interval is 1 second / 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; Close the slide plate 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, repeat this step.

[0025] In the embodiment of the present application, the fourth preset time interval is 0.5 seconds / 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<eighth preset threshold; the seventh preset weight threshold is 65 tons, and the eighth preset threshold is 0.05; In the embodiment of the present application, the fifth preset time interval is 0.5 seconds / time, and the fifth preset condition includes that the weight change rate Kt of the tundish is less than the ninth preset threshold value; the ninth preset threshold value is 0; 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, repeat this step.

[0026] In an embodiment of the present application, the present invention provides an electronic device, including 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.

[0027] In an embodiment of the present application, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0028] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0029] Those skilled in the art will readily appreciate other embodiments of the invention after considering the specification and practicing the invention invented herein. This application is intended to cover any variations, uses or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0030] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the protection scope of the present 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: Open the slide plate of the continuous casting tundish according to a first preset time interval and a first preset speed, and determine whether the first preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a second preset time interval and a second preset speed, and determine whether a second preset condition is met, and if so, execute the next step; Closing the slide plate of the continuous casting tundish according to a third preset time interval and a third preset speed, determining whether a third preset condition is met, and if so, executing the next 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 plate of the continuous casting tundish according to the fifth preset time interval and the fifth preset speed, otherwise execute the previous step.

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: Open the slide plate of the continuous casting tundish according to a sixth preset time interval and a sixth preset speed, and determine whether the sixth preset condition is met, and if so, execute the next step; Open the slide plate of the continuous casting tundish according to a seventh preset time interval and a seventh preset speed, and determine whether the seventh preset condition is met, and if so, execute 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 the eighth preset condition is met, and if so, terminating the operation, otherwise executing the next step; 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.

3. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: The first preset condition includes that the tundish weight M is greater than the first preset weight threshold, and the tundish weight change rate Kt is greater than the second preset threshold; Open the slide plate of the continuous casting tundish at a preset time interval and a first preset speed, and determine whether the weight M of the tundish meets the first preset condition. If so, repeat this step.

4. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: 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; Open the slide plate of the continuous casting tundish at a second preset time interval and a second preset speed to determine whether the weight M of the tundish meets a second preset condition. If so, repeat this step.

5. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: 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; Close the slide plate 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, repeat this step.

6. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: 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.

7. The method for automatic control of liquid level in a continuous casting tundish according to claim 1, characterized in that: The fifth preset condition includes that the tundish weight change rate Kt is less than a ninth preset threshold value; 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, repeat this step.

8. The method for automatic control of liquid level in a continuous casting tundish according to claim 3, characterized in that: The first preset weight threshold is 20 tons, and the second preset threshold is 0.

1.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 8 are implemented.

10. 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 8 are implemented.

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