Method, system and device for controlling weight of molten steel in intermediate ladle and storage medium

Abstract

This invention provides a method for controlling the weight of molten steel in a ladle, comprising S1: setting a standard weight value W for the molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q] p Q p The operating cycle V of the large water inlet valve zT The value; set in a V zT The time V for the opening of the internal valve to increase zOpnT and the time V for the opening to decrease zClsT S2: Obtain the actual weight W of the molten steel in the ladle. z and the actual rate of change of weight Q w W z With [W] s -W b W s +W b In comparison, Q w With [-Q] b Q b In comparison, the valve opening degree is determined according to V. zT Increase or decrease; S3: Q after valve actuation w Changes beyond [-Q] b Q b If the valve is activated, then the valve operation will be paused; S4: W z Q w Change, W z Change to cross W s The valve reverses direction; S5: Q w Change to [-Q] p Q p When the valve stops operating, the valve operation is stopped. This invention enables pulse-width modulation (PWM) control of the valve opening to maintain the weight of molten steel in the ladle at a slowly fluctuating value near a set point.

Description

Technical Field

[0001] This invention relates to the field of continuous casting technology in the steelmaking industry, and more specifically, to a method, system, device, and storage medium for controlling the weight of molten steel in a ladle. Background Technology

[0002] In the continuous casting industry of metallurgical steelmaking, to ensure the quality of the cast billet, the molten steel level in the tundish needs to be maintained at a certain height and fluctuate slowly. Excessive fluctuation can easily lead to slag being drawn into the molten steel, increasing inclusions and affecting the quality of the cast billet. "Maintaining" refers to the molten steel level in the tundish fluctuating around a set value. The height of the molten steel level in the tundish is generally not directly obtainable; currently, it is mostly indicated indirectly by the weight of the molten steel in the tundish. The heavier the molten steel, the higher the molten steel level in the tundish, and vice versa.

[0003] Molten steel flows from the ladle through the ladle nozzle into the tundish, then flows out through the tundish nozzle and into the crystallizer. During normal production, although the weight of the molten steel in the tundish is affected by the steel flowing out of the tundish nozzle, it is generally not a factor in controlling the tundish steel weight. The weight of the molten steel in the tundish is primarily controlled by adjusting the opening of the ladle nozzle.

[0004] If the weight of molten steel in the ladle is not controlled, the difference between the actual weight and the set value will gradually increase due to various factors. To ensure normal production, manual intervention is often used to restore it to the set value. To reduce manual labor intensity, some steel plants have adopted automatic ladle steel weight maintenance systems. Existing automatic ladle steel weight maintenance systems typically use a method where the actual weight of the molten steel in the ladle is greater than or less than the set value by a certain range, automatically closing or opening the ladle nozzle valve to keep the weight fluctuating around the set value. However, in actual use, frequent operation of the ladle nozzle valve causes excessive and rapid fluctuations in the molten steel level, resulting in low utilization of the automatic maintenance system, with manual operation still being the norm. Summary of the Invention

[0005] In view of the above problems, the purpose of this invention is to provide a method, system, device and storage medium for controlling the weight of molten steel in a ladle, in order to solve the problem that the difference between the actual weight of molten steel in the ladle and the set value will gradually increase. The invention uses parameters such as the marked weight value of molten steel in the ladle, the weight change limit value, and the weight change rate range as limiting conditions, and controls the opening of the ladle nozzle valve according to the pulse width modulation of the action cycle, so as to keep the weight of molten steel in the ladle fluctuating slowly around the set value.

[0006] This invention provides a method for controlling the weight of molten steel in a ladle, which controls the weight of molten steel in the ladle by controlling the opening degree of the ladle nozzle valve, and includes the following steps:

[0007] S1: Set the standard weight value W of the molten steel in the ladle. sWeight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value;

[0008] When the opening degree of the large water inlet valve is increased, in the V zT The time V during which the opening degree of the large water inlet valve gradually increases. zOpnT The value of V is set such that when the opening of the large water inlet valve decreases, the V... zT The time V during which the opening degree of the large water inlet valve gradually decreases. zClsT The value of V zOpnT and the V zClsT All are composed of the V zT The continuous time at the beginning;

[0009] W s Add / subtract the W mentioned b Obtain the weight variation range limit [W] s -W b W s +W b ];

[0010] S2: Obtain the actual weight W of the molten steel in the ladle. z and the actual weight change rate Q of the molten steel in the ladle w , will the W z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjust the opening degree of the large water inlet valve;

[0011] S3: When the Q w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package water inlet valve will be suspended;

[0012] S4: When the W z With the Q w Change, across the W s And the W z In the [W s-W b W s +W b Within, according to the aforementioned V zT Adjust the opening degree of the large water inlet valve in the reverse direction;

[0013] S5: When the Q w Change to the [-Q] p Q p If the weight of the molten steel in the intermediate ladle is within the weight variation range limit, then the operation of the ladle nozzle valve will be stopped.

[0014] One optional approach is to set the W value in step S1 according to the continuous casting machine specifications and the continuous casting production process. s The W b The [-Q] b Q b ], the aforementioned [-Q p Q p The V zT The V zOpnT and the V zClsT The value.

[0015] One possible solution is that the V zOpnT and the V zClsT All are in the V zT Within.

[0016] One optional approach is that, in step S2, the W... z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjusting the opening of the main water inlet valve includes:

[0017] When the W z Greater than W s +W b And the Q w Greater than 0, or when the W z In the [W s -W b W s +W b [Inside and the Q] w Greater than Q b The opening degree of the large water inlet valve is according to the V zT Decrease;

[0018] When the W z Less than W s -W b And the Q w Less than 0, or when the W z In the [W s -W b W s +W b [Inside and the Q] w Less than -Q b The opening degree of the large water inlet valve is according to the V zT Increase.

[0019] One possible solution is that, in S3, when Q... w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package inlet valve will be suspended, including:

[0020] When the opening of the large water inlet valve decreases, Q w Change to less than -Q b The opening degree of the large water inlet valve is temporarily reduced;

[0021] When the opening degree of the large water inlet valve increases, Q w Change to greater than Q b The opening degree of the large water inlet valve is temporarily increased.

[0022] One possible approach is that, in step S4, when the W... z With the Q w Change, across the W s And W z In the [W s -W b W s +W b Within, according to the aforementioned V zT Reverse adjustment of the opening degree of the large water inlet valve includes:

[0023] When the opening of the large water inlet valve stops decreasing, the W z With the Q w Changes, the W z Change to less than W s And the W z In the [W s -W b W s +W b Within, the large package water inlet valve is configured according to the V... zT The opening degree increases;

[0024] When the opening of the large water inlet valve stops increasing, the W z With the Q w Changes, the W z Change to greater than W s And the W z In the [W s -W b W s +W b Within, the large package water inlet valve is configured according to the V... zT The opening decreases.

[0025] One possible solution is that the [-Q] p Q p ] is included in the [-Q b Q b ]Inside,

[0026] In S5, when Q w Change to the [-Q] p Q p [Includes:]

[0027] The Q w From less than -Q b Change to greater than -Q p And less than 0;

[0028] Or the Q mentioned w From greater than Q b Change to less than Q b And it is greater than 0.

[0029] Another aspect of the present invention provides a ladle molten steel weight control system for controlling the weight of molten steel in the ladle by controlling the opening degree of the ladle nozzle valve, comprising:

[0030] Parameter setting unit: Used to set the standard weight value W of molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value; when the opening of the large water inlet valve is increased, in the V zT The time V during which the opening degree of the large water inlet valve gradually increases. zOpnT The value of V is set such that when the opening of the large water inlet valve decreases, the V... zTThe time V during which the opening degree of the large water inlet valve gradually decreases. zClsT The value of V zOpnT and the V zClsT All are composed of the V zT The continuous time at the beginning; the W s Add / subtract the W mentioned b Obtain the weight variation range limit [W] s -W b W s +W b ];

[0031] Valve opening determination unit: used to obtain the actual weight W of the molten steel in the ladle. z and the actual weight change rate Q of the molten steel in the ladle w , will the W z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjust the opening degree of the large water inlet valve;

[0032] Valve pausing unit: used when the Q w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package water inlet valve will be suspended;

[0033] Valve reverse adjustment unit: used when the W z With the Q w Change, across the W s And the W z In the [W s -W b W s +W b Within, according to the aforementioned V zT Adjust the opening degree of the large water inlet valve in the reverse direction;

[0034] Valve stop unit: When the Q w Change to the [-Q] p Q p If the weight of the molten steel in the intermediate ladle is within the weight variation range limit, then the operation of the ladle nozzle valve will be stopped.

[0035] Another aspect of 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, characterized in that the processor executes the computer program to implement the steps of the above-described method for controlling the weight of molten steel in a ladle.

[0036] Another aspect of the present invention provides a computer-readable storage medium comprising a computer program that, when executed by a processor, implements the steps of the above-described method for controlling the weight of molten steel in a ladle.

[0037] As can be seen from the above description, the method, system, device, and storage medium for controlling the weight of molten steel in the ladle provided by the present invention adopt a pre-set standard weight value W for the molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p [Values ​​and actual weight W of molten steel in the ladle] z The actual rate of change of weight Q w The comparison results serve as a limiting condition for the operation of the large-capacity water inlet valve. The large-capacity water inlet valve operates according to its operating cycle V. zT The action is controlled by pulse width modulation to regulate the opening. This invention automatically controls the smooth operation of the ladle nozzle valve to maintain the weight of the molten steel in the ladle at the standard weight value W. s The valve fluctuates slowly and nearby, avoiding frequent opening and closing of the valve and manual intervention.

[0038] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below and particularly pointed out in the claims. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to include all such aspects and their equivalents. Attached Figure Description

[0039] Other objects and results of the invention will become more apparent and readily understood by referring to the following description taken in conjunction with the accompanying drawings, and with a more complete understanding of the invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the structure of a continuous casting machine in the prior art;

[0041] Figure 2 This is a flowchart of the method for controlling the weight of molten steel in the ladle according to Embodiment 1 of the present invention;

[0042] Figure 3 This is a block diagram of the logic structure of the ladle steel weight control system according to Embodiment 2 of the present invention;

[0043] Figure 4 This is a schematic diagram of the logic structure of an electronic device according to Embodiment 3 of the present invention.

[0044] Among them, 1-large package, 2-large package water inlet valve, 3-medium package, 4-crystallizer;

[0045] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0046] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0047] This invention can be modified and has various embodiments, with specific embodiments illustrated in the accompanying drawings. However, this invention is not limited to this particular implementation and all modifications, equivalents, and substitutions falling within the spirit and technical scope of this invention are to be understood as included.

[0048] Ordinal terms such as "first," "second," etc., may be used to describe various constituent elements, but the constituent elements are not limited to these terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the claims of this invention, a second constituent element may be named a first constituent element, and similarly, a first constituent element may be named a second constituent element. Terms and / or include combinations of multiple associated items or one of multiple associated items.

[0049] It should be understood that when referring to a constituent element being "connected" or "in contact" with other constituent elements, this includes not only cases where it is directly connected or in contact with other constituent elements, but also cases where other constituent elements exist between them. Conversely, when referring to a constituent element being "directly connected" or "directly in contact" with other constituent elements, it should be understood that no other constituent elements exist between them.

[0050] In the description of the embodiments, when it is stated that a certain component is formed "on or under" other components, "on or under" includes both two components that are in direct contact with each other and at least one other component that is configured to be formed between the two components. Furthermore, when expressed as "on or under", based on a certain component, it refers not only to the upper direction but may also include the lower direction.

[0051] The terminology used in this application is for illustrative purposes only and is not intended to limit the invention. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this application, it should be understood that terms such as "comprising" or "having" are used to specify the presence of features, numbers, steps, operations, constituent elements, components, or combinations thereof described in the specification, and do not preclude the presence or additional possibilities of one or more other features, numbers, steps, operations, constituent elements, components, or combinations thereof.

[0052] Unless otherwise defined, including technical or scientific terms, all terms used herein have the same meaning as commonly understood by those skilled in the art. Terms as defined in commonly used dictionaries should be interpreted in a meaning consistent with their meaning in the context of the relevant art, and should not be construed as having an ideal or overly formal meaning unless explicitly defined in this application.

[0053] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0054] Explanation of parameter symbols:

[0055] Standard weight value W s ;

[0056] Weight change limit W b ;

[0057] Maximum range limit of weight change rate [-Q] b Q b ];

[0058] Optimal range limit for rate of weight change [-Q] p Q p ];

[0059] The operating cycle V of the large water inlet valve zT ;

[0060] One action cycle V zT The time V during which the opening of the inner large water inlet valve gradually increases zOpnT ;

[0061] One action cycle V zTThe time V during which the opening of the inner large water inlet valve gradually decreases zClsT ;

[0062] The actual weight W of molten steel in the ladle z ;

[0063] The actual weight change rate Q of molten steel in the ladle w ;

[0064] Weight variation limit of molten steel in tundish [W] s -W b W s +W b ].

[0065] Example 1

[0066] like Figure 2 and Figure 3 As shown, the molten steel weight control method proposed in this embodiment can be used to automatically maintain the molten steel weight in the tundish of a continuous casting machine within a set range, and can also be used to automatically maintain the liquid level in other containers.

[0067] like Figure 1 As shown, the existing continuous casting machine includes a ladle 1, a tundish 3, and a crystallizer 4 connected in sequence. Molten steel from the ladle flows into the tundish 3 through the ladle nozzle valve 2, and molten steel from the tundish flows into the crystallizer 4 through the tundish nozzle valve. Increasing the opening of the ladle nozzle valve 2 increases the flow rate of molten steel into the tundish 3; increasing the opening of the tundish nozzle valve increases the flow rate of molten steel into the crystallizer 4, and vice versa. When the flow rate of molten steel into the tundish 3 is greater than the flow rate into the crystallizer 4, the molten steel level in the tundish rises, and the weight of the molten steel in the tundish increases, and vice versa. Therefore, during normal production, the weight of the molten steel in the tundish can be controlled within a certain range by controlling the opening of the ladle nozzle valve 2, while the flow rate of the tundish nozzle valve is negligible.

[0068] The method for controlling the weight of molten steel in the tundish in this embodiment controls the weight of molten steel in the tundish by controlling the opening degree of the ladle nozzle valve, and includes the following steps:

[0069] S1: Set the standard weight value W of the molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value; when the opening of the main water inlet valve is increased, during the action cycle V zT The time V during which the opening of the inner large water inlet valve gradually increases uniformly. zOpnTThe value is set such that when the opening of the large water inlet valve decreases, the action cycle V... zT The time V during which the opening of the inner large water inlet valve gradually decreases uniformly. zClsT The value of V zOpnT and V zClsT All are made by V zT The continuous time at the beginning; the standard weight value W s Weight change limit W b The weight variation range limit [W] was obtained. s -W b W s +W b ].

[0070] In practical applications, W is set according to the continuous casting machine and the continuous casting production process. s W b 、[-Q b Q b ]、[-Q p Q p ]、V zT V zOpnT and V zClsT The value.

[0071] The setting of the above parameters needs to comprehensively consider factors such as the process requirements of continuous casting production, the size of the tundish, the temperature characteristics of the molten steel, and the response sensitivity of the equipment. Standard weight value W s The limit can be determined based on the rated working capacity of the tundish and the molten steel demand of the crystallizer to ensure a stable supply of molten steel and avoid overfilling or underfilling the tundish. The unit can be tons. Weight variation limit W b Used to limit the fluctuation range of molten steel weight in the ladle within a short period of time, the molten steel weight in the ladle is determined by the standard weight value W. s If the fluctuation range exceeds W b That is, the weight of the molten steel in the ladle exceeds [W] s -W b W s +W b To prevent excessive weight changes in the molten steel in the tundish, the opening of the ladle nozzle valve must be controlled by increasing or decreasing it. The maximum limit for the rate of weight change is [-Q]. b Q b [], used to limit the range of the rate of change of molten steel weight in the ladle, the unit can be tons / second, and it is used if the rate of change of weight is between 0 and Q. b The interval indicates that the weight of the molten steel in the ladle is increasing slowly. If the rate of weight change is greater than Q... b This indicates that the weight of the molten steel in the ladle will increase rapidly. Therefore, the opening of the ladle nozzle valve should be reduced. If the rate of weight change is between 0 and -Q... bThe interval indicates that the weight of the molten steel in the ladle is decreasing slowly. If the rate of weight change is less than -Q... b This indicates that the weight of the molten steel in the ladle is decreasing rapidly, and the opening of the ladle nozzle valve should be increased. The optimal range limit for the rate of weight change is [-Q]. p Q p ], used to define the optimal range of the rate of weight change of molten steel in the ladle. If the rate of weight change falls within [-Q], p Q p Within the ladle, the weight of the molten steel changes slowly; at this point, the operation of the ladle nozzle valve can be stopped. The operating cycle V of the ladle nozzle valve... zT The unit can be seconds. It is used to define the operating cycle of the main water inlet valve. Within each cycle, the valve opening increases or decreases for a certain period, and the valve remains stationary for the rest of the time. In one operating cycle, V... zT Inner V zOpnT or V zClsT Each of these actions occupies a portion of the initial part of the action cycle. During the remaining time of the action cycle, the valve stops operating and maintains its current opening degree. Preferably, V zOpnT and V zClsT All in V zT Within a certain timeframe, the duration is determined based on specific circumstances, allowing sufficient time for valve cessation to ensure a stable transition in the weight of the molten steel in the tundish and prevent excessive weight fluctuations due to excessive valve movement. The ladle nozzle valve operates periodically, opening and closing in a pulse-modulated manner, smoothly regulating the valve opening and preventing flow surges caused by excessively rapid valve movement or failure to respond promptly to weight changes. This improves the accuracy and stability of molten steel weight control in the tundish, providing a reliable guarantee for the smooth operation of continuous casting production.

[0072] S2: Obtain the actual weight W of the molten steel in the ladle. z The actual weight change rate Q of molten steel in the ladle w The actual weight W z With [W] s -W b W s +W b In comparison, the actual rate of change of weight Q w With respect to the weight change rate range limit [-Q] b Q b In comparison, the opening degree of the large water inlet valve is determined, and according to the action cycle V zT Adjust the opening of the main water inlet valve.

[0073] The actual weight W of the molten steel in the ladle z Deviation from standard weight value W s At that time, we hope the actual weight W z Slow changes, until returning to Ws Nearby; the actual rate of change Q of the molten steel in the ladle w Exceeding the limit of the rate of weight change range [-Q] b Q b Actual weight W z It will also quickly deviate from the standard weight value W s The actual rate of change of weight Q needs to be considered. w Adjust back to the weight change rate range limit to achieve a slow change in the weight of molten steel in the ladle.

[0074] Using actual weight W z and the actual rate of change of weight Q w The values ​​of the two variables are used to determine whether the opening of the main water inlet valve increases or decreases.

[0075] Specifically, the judgment methods may include:

[0076] When W z Greater than W s +W b And Q w If the value is greater than 0, then the opening degree of the main water inlet valve is according to V. zT Decrease.

[0077] Actual weight W z It exceeds the maximum weight limit W s +W b This indicates the actual weight W z If it's too large, it needs to be reduced to maintain a stable actual weight. At this point, the rate of change of the actual weight is Q. w If the value is exactly greater than 0, it cannot effectively reduce the actual weight W. z Then the opening of the main water inlet valve needs to be further reduced to further decrease the actual weight change rate Q. w , making the actual weight W z Gradually decrease. As the opening of the main inlet valve decreases, execute several action cycles V. zT It decreases steadily.

[0078] Or at this time, when W z In [W] s -W b W s +W b [Inner and Q] w Greater than Q b The opening degree of the main water inlet valve is according to V. zT Decrease.

[0079] Actual weight W z Within the weight variation range limit [W] s -W b W s +Wb Within ], but the actual rate of change of weight Q w This is greater than the maximum limit Q for the rate of weight change. b Actual weight W z It will soon increase beyond the maximum weight limit W s +W b Then the opening of the main water inlet valve should be reduced to decrease the actual weight change rate Q. w , making the actual weight W z It won't grow too quickly. When the opening of the large-capacity inlet valve decreases, it executes several operating cycles V. zT It decreases steadily.

[0080] Conversely, when W z Less than W s -W b And Q w If the value is less than 0, the opening degree of the large water inlet valve shall be in accordance with V. zT Increase.

[0081] Actual weight W z Less than the minimum weight limit W s -W b This indicates the actual weight W z If it's too small, it needs to be increased to maintain a stable actual weight. At this point, the rate of change of the actual weight, Q... w If the value is exactly less than 0, it cannot effectively increase the actual weight W. z Therefore, the opening of the main water inlet valve should be increased to increase the actual weight change rate Q. w , making the actual weight W z Gradually increase the opening. As the opening of the main valve increases, execute several operating cycles (V). zT It increases steadily.

[0082] Or at this time, when W z In [W] s -W b W s +W b [Inner and Q] w Less than -Q b The opening degree of the main water inlet valve is according to V zT Increase.

[0083] Actual weight W z Within the weight variation range limit [W] s -W b W s +W b Within ], but the actual rate of change of weight Q w At this point, it is less than the minimum limit for the rate of weight change -Q. b Actual weight W zIt will soon decrease beyond the minimum weight limit W s -W b Then the opening of the main water inlet valve needs to be increased to increase the actual weight change rate Q. w , making the actual weight W z It won't decrease too quickly. When the opening of the large-capacity inlet valve increases, it executes several operating cycles V. zT It increases steadily.

[0084] S3: Q after the main water inlet valve is activated w The change exceeds the maximum range limit for the rate of change of weight [-Q]. b Q b If the valve at the main water inlet is activated, the operation of the valve will be suspended.

[0085] After the valve at the large inlet of the water tank is opened or closed, the rate of change of the actual weight Q is observed. w The value of Q w The value will gradually change in the opposite direction until it exceeds [-Q]. b Q b This will pause the operation of the main water inlet valve, maintaining the actual weight change rate Q at this point. w This causes the actual weight W of the molten steel in the ladle to increase. z change.

[0086] Specifically, when the opening of the main water inlet valve decreases, Q w Change to less than -Q b The opening of the large water inlet valve stopped decreasing.

[0087] When the opening of the main water inlet valve decreases, the actual weight change rate Q w It will gradually decrease. Regardless of Q w Whether the value obtained is negative or positive, it must be subtracted to -Q. b The following steps, stopping the reduction of the valve opening at the main inlet, are beneficial to the actual weight W. z The amount should be reduced appropriately.

[0088] Conversely, when the opening of the main water inlet valve increases, Q w Change to greater than Q b The opening of the large water inlet valve stopped increasing.

[0089] When the opening of the main water inlet valve increases, the actual weight change rate Q w It will gradually increase. Regardless of Q w Whether the value obtained is positive or negative, it must be incremented to Q. b After that, stopping the increase in the opening of the main water inlet valve will help to reduce the actual weight W. z The appropriate amount of increase.

[0090] S4: Actual weight W z Q w Change, when W z Change to cross the standard weight value W s And the actual weight W z Within the weight variation range [W] s -W b W s +W b Within [the timeframe], according to the action cycle V zT Adjust the opening degree of the main water inlet valve in the reverse direction.

[0091] After the opening of the main water inlet valve stops, the actual weight change rate Q w It will not change. Observe the actual weight W. z The value of W z The value will gradually change in the opposite direction until it crosses the standard weight value W. s But still in [W s -W b W s +W b If the change in molten steel in the tundish is moderate, the opening of the ladle valve can be adjusted in the opposite direction to prevent excessive changes in the amount of molten steel.

[0092] Specifically, when the opening of the ladle valve stops decreasing, the actual weight W of the molten steel in the tundish... z Q w Change, W z Change to less than the standard weight value W s And the actual weight W z Within the weight variation range [W] s -W b W s +W b Inside, the large water inlet valve operates according to the cycle V. zT The opening degree increases.

[0093] The actual weight W of molten steel in the ladle z With -Q b The following is the actual rate of change of weight Q w Decrease, regardless of W z When obtaining, it is greater than or less than W. s All must be in [W s -W b W s +W b [Inside and less than W] s At that time, according to the action cycle V zT Increase the opening of the large water inlet valve, and Q w The speed is changed from a negative high speed to a negative slow speed to prevent the actual weight W from changing. zExcessive reduction, maintaining actual weight W z Approaching W s .

[0094] Conversely, when the opening of the ladle valve stops increasing, the actual weight W of the molten steel in the tundish... z Q w Change, W z Changes to a value greater than the standard weight W s And the actual weight W z Within the weight variation range [W] s -W b W s +W b Inside, the large water inlet valve operates according to the cycle V. zT The opening decreases.

[0095] The actual weight W of molten steel in the ladle z Q b The above actual weight change rate Q w Increase, regardless of W z When obtaining, it is less than or greater than W. s All must be in [W s -W b W s +W b [Inside and greater than W] s At that time, according to the action cycle V zT Reduce the opening of the main water inlet valve, and Q w The speed was changed from high to low to prevent the actual weight W from being affected. z Excessive enlargement, maintaining actual weight W z Approaching W s .

[0096] S5: When Q w The optimal range limit for the rate of change of weight [-Q] p Q p When the temperature is within the specified range, the valve operation of the main ladle valve will stop, and the weight of the molten steel in the intermediate ladle will be within the weight variation range limit.

[0097] After the valve opening of the large water inlet reverses, the actual weight change rate Q w It will not continue to change according to the changes of the previous moment, but will gradually slow down. Q w The value falls into [-Q p Q p [Inside], it indicates the actual rate of change of weight, Q. w The absolute value is relatively small, in W z Approaching W s In the case of W z The changes are relatively stable and will not exceed the weight change limit within a short period of time [W].s -W b W s +W b ].

[0098] Specifically, the large water inlet valve in S4 operates according to the action cycle V. zT As the opening increases, Q w From less than -Q b Change to greater than -Q p And if it is less than 0, the large water inlet valve can stop operating. Q w From negative high speed to negative low speed, W z It continues to decrease at a slow, negative rate.

[0099] S4 large water inlet valve operates according to cycle V zT After the opening decreases, Q w From greater than Q b Change to less than Q b And if it is greater than 0, the water inlet valve can stop operating. Q w From positive high speed to positive low speed, W z It continues to increase at a slow, positive rate.

[0100] In this embodiment, [-Q p Q p ] is included in [-Q b Q b [Inside, such as Q] p For Q b Half of this further narrows the stable range of the rate of weight change. When Q w Enter [-Q] p Q p When the value is within the specified range, it indicates that the dynamic change in the weight of molten steel in the ladle is under more precise control. At this point, stopping the operation of the ladle nozzle valve can avoid system fluctuations caused by frequent adjustments. p For Q b The half-set configuration retains effective monitoring of the rate of weight change, while reducing unnecessary valve actions by using reasonable threshold division, thereby reducing equipment wear and improving the accuracy and efficiency of molten steel weight control in the ladle.

[0101] Repeat steps S2-S5. After executing S2-S5 once, W is guaranteed. z Stable and maintained at [W s -W b W s +W b Inside, and W z With [-Q p Q pThe speed within the range changes slowly, and W can be obtained every set time interval. z and Q w The set time length can be determined according to the specific equipment specifications and process conditions.

[0102] In this embodiment, considering the actual weight W of the molten steel in the ladle z For variables exhibiting large inertial fluctuations, the effect of the valve opening on the main water inlet requires a certain amount of time to be observed. Therefore, the actual weight change rate Q is introduced for observation. w This variable, through pulse width modulation (PWM) control of the ladle nozzle valve opening, precisely controls the amount of molten steel flowing into the tundish, thereby achieving W... z Slow change.

[0103] The operation of the large water inlet valve is controlled by a PLC system.

[0104] In a certain production process, let W be... s =40 tons, W b =1 ton, Q b =0.006 tons / second, Q p =0.003 tons / second, V zT =5 seconds, V zOpnT =0.15 seconds, V zClsT =0.2 seconds.

[0105] When the W of the molten steel in the tundish is obtained z =41.001 tons, Q w When W = 0.002 tons / second, z >W s +W b And Q w >0, the opening of the large water inlet valve decreases with an action cycle of 5 seconds, and the opening gradually decreases by 0.2 seconds every 5 seconds;

[0106] As the opening decreases, Q w When Q changes from 0.002 tons / second to -0.007 tons / second, w <-Q b The main water inlet valve stopped operating;

[0107] W z Q w = -0.007 tons / second decrease, when W z The amount changed from 41.001 tons to 39.999 tons, at which point W... z <W s And W z In [W] s -W b W s +W bWithin the [section], the opening of the large water inlet valve increases with a 5-second action cycle, gradually increasing by 0.15 seconds every 5 seconds;

[0108] As the aperture increases, Q w From -0.007 tons / second to -0.002 tons / second, Q w Falling into [-Q p Q p Inside, the large water inlet valve stopped operating. z With -0.002 w The speed continues to decrease from <0 tons / second.

[0109] When the W of the molten steel in the tundish is obtained z For W z =38.999 tons, Q w When W = -0.002 tons / second, z <W s -W b And Q w <0, the opening of the large water inlet valve increases with a 5-second action cycle, and the opening gradually increases by 0.15 seconds every 5 seconds;

[0110] As the opening increases, Q w When Q changes from -0.002 tons / second to 0.007 tons / second, w Q b The main water inlet valve stopped operating;

[0111] W z Q w =0.007 tons / second increase, when W z The amount changed from 38.999 tons to 40.001 tons, at which point W... z >W s And W z In [W] s -W b W s +W b Within the system, the opening of the main water inlet valve decreases in 5-second cycles, gradually closing by 0.15 seconds every 5 seconds;

[0112] As the opening decreases, Q w From 0.007 tons / second to 0.002 tons / second, Q w Falling into [-Q p Q p Inside, the large water inlet valve stopped operating. z With 0 w The speed continued to increase from <0.002 tons / second.

[0113] ​​In the above production example, the rate of weight change of the molten steel in the ladle was first adjusted to slightly exceed the maximum limit of the weight change rate, so that the actual weight of the molten steel in the ladle smoothly and quickly entered the weight change range limit. Then, the rate of weight change was adjusted to be within the optimal range limit, so that the molten steel in the ladle fluctuated slowly within the weight change range limit. This achieved the automatic maintenance of the weight of the molten steel in the ladle within a slow fluctuation range of 40±1 tons.

[0114] Example 2

[0115] Figure 3 This is a block diagram of the logic structure of the ladle steel weight control system according to Embodiment 2 of the present invention;

[0116] like Figure 3 As shown, the tundish steel weight control system provided in this embodiment is used to control the weight of tundish steel by controlling the opening degree of the ladle nozzle valve. It includes a parameter setting unit, a valve opening degree determination unit, a valve pause unit, a valve reverse adjustment unit, and a valve stop unit.

[0117] Parameter setting unit: Used to set the standard weight value W of molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value; when the opening of the main water inlet valve is increased, in V zT The time V during which the opening of the inner large water inlet valve gradually increases zOpnT The value is set such that when the opening of the main water inlet valve decreases, V zT The time V during which the opening of the inner large water inlet valve gradually decreases zClsT The value of V zOpnT and V zClsT All are made by V zT The continuous time at the beginning; W s Add / subtract W b Obtain the weight variation range limit [W] s -W b W s +W b ].

[0118] In practical applications, W is set according to the continuous casting machine and the continuous casting production process. s W b 、[-Q b Q b ]、[-Q p Q p ]、VzT V zOpnT and V zClsT The value.

[0119] Valve opening determination unit: used to obtain the actual weight W of molten steel in the ladle. z The actual weight change rate Q of molten steel in the ladle w W z With [W] s -W b W s +W b In comparison, Q w With [-Q b Q b In comparison, the opening degree of the main water inlet valve is determined, and according to V zT Adjust the opening of the main water inlet valve.

[0120] When W z Greater than W s +W b And Q w If the value is greater than 0, then the opening degree of the main water inlet valve is according to V. zT Decrease. Or at this point, when W z In [W] s -W b W s +W b [Inner and Q] w Greater than Q b The opening degree of the main water inlet valve is according to V. zT Decrease.

[0121] Conversely, when W z Less than W s -W b And Q w When the value is less than 0, the opening degree of the main water inlet valve is determined according to V. zT Increase. Or at this point, when W z In [W] s -W b W s +W b [Inner and Q] w Less than -Q b The opening degree of the main water inlet valve is according to V zT Increase.

[0122] Valve pausing unit: used when Q w Change to beyond [-Q] b Q b If the valve at the main water inlet is activated, the operation of the valve will be suspended.

[0123] When the opening of the main water inlet valve decreases, Q wChange to less than -Q b When the opening of the main water inlet valve increases, Q stops decreasing. Conversely, when the opening of the main water inlet valve increases, Q... w Change to greater than Q b The opening of the large water inlet valve stopped increasing.

[0124] Valve reverse regulating unit: used to adjust the actual weight W of the molten steel in the ladle. z Q w Change, W z Change to cross the standard weight value W s And the actual weight W z Within the weight variation range limit [W] s -W b W s +W b Within [the timeframe], according to the action cycle V zT Adjust the opening degree of the main water inlet valve in the reverse direction.

[0125] When the opening of the ladle valve stops decreasing, the actual weight W of the molten steel in the tundish... z Q w Change, W z Change to less than the standard weight value W s And the actual weight W z Within the weight variation range [W] s -W b W s +W b Inside, the large water inlet valve operates according to the cycle V. zT The opening degree increases. Conversely, when the opening degree of the ladle nozzle valve stops increasing, the actual weight W of the molten steel in the tundish... z Q w Change, W z Changes to a value greater than the standard weight W s And the actual weight W z Within the weight variation range [W] s -W b W s +W b Inside, the large water inlet valve operates according to the cycle V. zT The opening decreases.

[0126] Valve stop unit: used when Q w The optimal range limit for the rate of change of weight [-Q] p Q p When the molten steel in the ladle is within the specified range, stop the operation of the ladle valve and ensure that the weight of the molten steel in the tundish is within the weight variation limit.

[0127] S4 large water inlet valve operates according to cycle V zT As the opening increases, Qw From less than -Q b Change to greater than -Q p And if it is less than 0, the large water inlet valve can stop operating. Q w From negative high speed to negative low speed, W z It continues to decrease at a slow, negative rate.

[0128] S4 large water inlet valve operates according to cycle V zT After the opening decreases, Q w From greater than Q b Change to less than Q b And if it is greater than 0, the large water inlet valve can stop operating. Q w From positive high speed to positive low speed, W z It continues to increase at a slow, positive rate.

[0129] Example 3

[0130] Figure 4 This is a schematic diagram of the logic structure of an electronic device according to Embodiment 3 of the present invention.

[0131] like Figure 4 As shown, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the ladle steel weight control method of Embodiment 1.

[0132] Example 4

[0133] A computer-readable storage medium includes a computer program that, when executed by a processor, implements the steps of the ladle steel weight control method in Embodiment 1.

[0134] The method, system, apparatus, and storage medium for controlling the weight of molten steel in a ladle according to the present invention have been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the method, system, apparatus, and storage medium for controlling the weight of molten steel in a ladle according to the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for controlling the weight of molten steel in a ladle, wherein the weight of molten steel in the ladle is controlled by controlling the opening degree of the ladle nozzle valve, characterized in that, Includes the following steps: S1: Set the standard weight value W of the molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value; When the opening degree of the large water inlet valve is increased, in the V zT The time V during which the opening degree of the large water inlet valve gradually increases. zOpnT The value of V is set such that when the opening of the large water inlet valve decreases, the V... zT The time V during which the opening degree of the large water inlet valve gradually decreases. zClsT The value of V zOpnT and the V zClsT All are composed of the V zT The continuous time at the beginning; W s Add / subtract the W mentioned b Obtain the weight variation range limit [W] s -W b W s +W b ]; S2: Obtain the actual weight W of the molten steel in the ladle. z and the actual weight change rate Q of the molten steel in the ladle w , will the W z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjust the opening degree of the large water inlet valve; S3: When the Q w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package water inlet valve will be suspended; S4: When the W z With the Q w Change, across the W s And the W z In the [W s -W b W s +W b Within, according to the aforementioned V zT Adjust the opening degree of the large water inlet valve in the reverse direction; S5: When the Q w Change to the [-Q] p Q p If the weight of the molten steel in the intermediate ladle is within the weight variation range limit, then the operation of the ladle nozzle valve will be stopped.

2. The method for controlling the weight of molten steel in the ladle as described in claim 1, characterized in that, In S1, the W is set according to the continuous casting machine conditions and continuous casting production process. s The W b The [-Q] b Q b ], the aforementioned [-Q p Q p The V zT The V zOpnT and the V zClsT The value.

3. The method for controlling the weight of molten steel in the ladle as described in claim 1, characterized in that, The V zOpnT and the V zClsT All are in the V zT Within.

4. The method for controlling the weight of molten steel in the ladle as described in claim 1, characterized in that, In S2, the W z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjusting the opening of the main water inlet valve includes: When the W z Greater than W s +W b And the Q w Greater than 0, or when the W z In the [W s -W b W s +W b [Inside and the Q] w Greater than Q b The opening degree of the large water inlet valve is according to the V zT Decrease; When the W z Less than W s -W b And the Q w Less than 0, or when the W z In the [W s -W b W s +W b [Inside and the Q] w Less than -Q b The opening degree of the large water inlet valve is according to the V zT Increase.

5. The method for controlling the weight of molten steel in the ladle as described in claim 4, characterized in that, In S3, when Q w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package inlet valve will be suspended, including: When the opening of the large water inlet valve decreases, Q w Change to less than -Q b The opening degree of the large water inlet valve is temporarily reduced; When the opening degree of the large water inlet valve increases, Q w Change to greater than Q b The opening degree of the large water inlet valve is temporarily increased.

6. The method for controlling the weight of molten steel in the ladle as described in claim 5, characterized in that, In S4, when the W z With the Q w Change, across the W s And W z In the [W s -W b W s +W b Within, according to the aforementioned V zT Reverse adjustment of the opening degree of the large water inlet valve includes: When the opening of the large water inlet valve stops decreasing, the W z With the Q w Changes, the W z Change to less than W s And the W z In the [W s -W b W s +W b Within, the large package water inlet valve is configured according to the V... zT The opening degree increases; When the opening of the large water inlet valve stops increasing, the W z With the Q w Changes, the W z Change to greater than W s And the W z In the [W s -W b W s +W b Within, the large package water inlet valve is configured according to the V... zT The opening decreases.

7. The method for controlling the weight of molten steel in the ladle as described in claim 6, characterized in that, The [-Q] p Q p ] is included in the [-Q b Q b ]Inside, In S5, when Q w Change to the [-Q] p Q p [Includes:] The Q w From less than -Q b Change to greater than -Q p And less than 0; Or the Q mentioned w From greater than Q b Change to less than Q b And it is greater than 0.

8. A tundish molten steel weight control system, used to control the weight of molten steel in the tundish by controlling the opening degree of the ladle nozzle valve, characterized in that, include: Parameter setting unit: Used to set the standard weight value W of molten steel in the ladle. s Weight variation limit W b Maximum range limit for rate of weight change [-Q] b Q b ], Optimal range limit for rate of weight change [-Q p Q p The operating cycle V of the large water inlet valve zT The value; when the opening of the large water inlet valve is increased, in the V zT The time V during which the opening degree of the large water inlet valve gradually increases. zOpnT The value of V is set such that when the opening of the large water inlet valve decreases, the V... zT The time V during which the opening degree of the large water inlet valve gradually decreases. zClsT The value of V zOpnT and the V zClsT All are composed of the V zT The continuous time at the beginning; the W s Add / subtract the W mentioned b Obtain the weight variation range limit [W] s -W b W s +W b ]; Valve opening determination unit: used to obtain the actual weight W of the molten steel in the ladle. z and the actual weight change rate Q of the molten steel in the ladle w , will the W z With the aforementioned [W s -W b W s +W b In comparison, the Q w With the aforementioned [-Q b Q b In comparison, the opening degree of the large package inlet valve is determined, and according to the V... zT Adjust the opening degree of the large water inlet valve; Valve pausing unit: used when the Q w Change to exceed the [-Q] b Q b If the above occurs, the operation of the large package water inlet valve will be suspended; Valve reverse adjustment unit: used when the W z With the Q w Change, across the W s And the W z In the [W s -W b W s +W b Within, according to the aforementioned V zT Adjust the opening degree of the large water inlet valve in the reverse direction; Valve stop unit: When the Q w Change to the [-Q] p Q p If the weight of the molten steel in the intermediate ladle is within the weight variation range limit, then the operation of the ladle nozzle valve will be stopped.

9. An electronic device, characterized in that, The electronic device includes: 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 computer program, it implements the steps of the tundish molten steel weight control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a computer program that, when executed by a processor, implements the steps of the method for controlling the weight of molten steel in a ladle as described in any one of claims 1 to 7.

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