Control methods, devices, media and equipment for steelmaking continuous casting systems

Abstract

This application discloses a control method, apparatus, medium, and equipment for a continuous casting steelmaking system. The method includes: before pouring molten steel from the tundish into the crystallizer, obtaining the first position of the stopper rod; after the previous slab casting in the crystallizer has finished and the current slab casting length has reached a preset length value, controlling the slab casting speed to decrease from a first speed to a second speed, so that a new submerged entry nozzle is pushed into the initial position of the crystallizer at the second speed; obtaining the second position of the stopper rod at the second speed, adjusting the stopper rod from the second position to the first position, controlling the actuator to drive the new submerged entry nozzle from the initial position to the working position, and controlling the stopper rod to return to the second position; when the new submerged entry nozzle reaches the working position and the stopper rod returns to the second position, the current slab casting is not yet complete. This application ensures that the submerged entry nozzle replacement process affects at most the current slab, reducing the number of affected slabs and thus improving slab yield.

Description

Technical Field

[0001] This application belongs to the field of continuous casting control technology, and particularly relates to a control method, device, medium and equipment for a steelmaking continuous casting system. Background Technology

[0002] In the continuous casting process of steelmaking, a stable crystallizer flow field is ensured throughout the casting process by changing the submerged entry nozzle, which also increases the service life of the tundish and reduces costs. However, before changing the submerged entry nozzle, the normal production speed needs to be reduced stepwise to the target speed for the nozzle replacement. After the replacement is completed, the target speed is gradually increased back to the normal production speed. The unsteady speed change process before and after each submerged entry nozzle replacement will affect two or more slabs, increasing the probability of surface quality defects in the slabs. Summary of the Invention

[0003] The embodiments of this application provide a method, apparatus, medium, and equipment for controlling a steelmaking continuous casting system, which at least to a certain extent ensures that the replacement process of the submerged entry nozzle affects at most the current slab, reducing the number of slabs affected, thereby improving slab yield and production quality.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0005] A first aspect of this application provides a control method for a continuous casting system in steelmaking, the continuous casting system comprising: a tundish and a crystallizer, the method comprising: Before the tundish begins pouring molten steel into the crystallizer, the first position of the stopper rod is obtained; When the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches the preset length value, the slab pulling speed from the crystallizer is controlled to be reduced from the first pulling speed to the second pulling speed, so that the new submersible nozzle is pushed into the initial position in the crystallizer at the second pulling speed. The second position of the stopper rod at the second pulling speed is obtained, the stopper rod is adjusted from the second position to the first position, the actuator is controlled to drive the new immersion nozzle from the initial position to the working position, and the stopper rod is controlled to return to the second position; Specifically, when the new immersion nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been completed.

[0006] Optionally, controlling the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed includes: The slab pulling speed from the crystallizer is controlled to decrease from the first pulling speed to the second pulling speed according to the first acceleration, wherein the first acceleration is 3m / min2-6m / min2.

[0007] Optionally, obtaining the second position of the stopper rod at the second pulling speed includes: After the second pulling speed is maintained for a first duration, the second position of the stopper rod at the second pulling speed is obtained, wherein the first duration is 40 seconds to 60 seconds.

[0008] Optionally, after obtaining the second position of the stopper rod at the second pulling speed, the method further includes: The molten steel level in the crystallizer is controlled to rise from the current level to the target level at a preset rate, and maintained at the target level for a second duration. The preset speed is 120mm / min-200mm / min, and the second duration is 15 seconds-25 seconds.

[0009] Optionally, after the stopper is returned to the second position, the method further includes: After the stopper rod returns to the second position for a third time, the slab drawing speed is controlled to increase from the second drawing speed to the first drawing speed with a second acceleration, wherein the second acceleration is 0.2m / min2-0.3m / min2.

[0010] Optionally, after controlling the slab drawing speed to increase from the second drawing speed to the first drawing speed with a second acceleration, the method further includes: Obtain the current casting length of the current slab when the slab casting speed reaches the first casting speed; The length of slab consumed by the continuous casting system during the replacement of the submerged entry nozzle is determined based on the current casting length.

[0011] Optionally, the method further includes: When the previous slab casting in the crystallizer is completed, the sealing door of the quick-change mechanism at the bottom of the tundish is opened and the blind plate of the tundish is removed.

[0012] A second aspect of this application provides a control device for a continuous casting system in steelmaking, the continuous casting system comprising: a tundish and a crystallizer, the device comprising: The acquisition unit is used to acquire the first position of the stopper rod before the tundish starts pouring molten steel into the crystallizer; The first control unit is used to control the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed when the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches a preset length value, so as to push the new submersible nozzle into the initial position in the crystallizer at the second pulling speed. The second control unit is used to obtain the second position of the stopper rod at the second pulling speed, adjust the stopper rod from the second position to the first position, control the actuator to drive the new immersion nozzle from the initial position to the working position, and control the stopper rod to return to the second position. Specifically, when the new immersion nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been completed.

[0013] A third aspect of this application provides a computer-readable storage medium storing at least one computer program instruction, which is loaded and executed by a processor to perform the operations described in any of the methods described in the first aspect.

[0014] A fourth aspect of this application provides an electronic device including one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation as described in any of the methods in the first aspect.

[0015] The one or more technical solutions provided in the embodiments of the present invention achieve at least the following technical effects or advantages: The steelmaking continuous casting system control method of this application embodiment includes a continuous casting system comprising: a tundish and a crystallizer. The method includes: before the tundish starts pouring molten steel into the crystallizer, obtaining a first position of a stopper rod; when the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches a preset length value, controlling the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed, so that a new submersible nozzle is pushed into the initial position in the crystallizer at the second pulling speed; obtaining a second position of the stopper rod at the second pulling speed, adjusting the stopper rod from the second position to the first position, controlling an actuator to drive the new submersible nozzle from the initial position to the working position, and controlling the stopper rod to return to the second position; wherein, when the new submersible nozzle reaches the working position and the stopper rod returns to the second position, the current slab casting is not yet completed. Therefore, in this embodiment of the application, the submerged entry gate is replaced after the current slab has been cast but before the casting process is completed. This ensures that the replacement process of the submerged entry gate affects at most the current slab, reducing the number of slabs affected, thereby improving the slab yield and production quality.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart of a steelmaking continuous casting system control method according to an embodiment of this application is shown; Figure 2 A structural diagram of the control device for a steelmaking continuous casting system according to an embodiment of this application is shown; Figure 3 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0020] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different models and / or processor devices and / or microcontroller devices.

[0021] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0022] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0023] In the continuous casting process of steelmaking, replacing the submerged entry nozzle ensures a stable flow field in the crystallizer throughout the casting process, while also extending the service life of the tundish and reducing costs. However, before replacing the submerged entry nozzle, the normal production speed needs to be gradually reduced to the target speed for nozzle replacement. After replacement, the speed is gradually increased back to the normal production speed. Each unsteady speed change before and after replacing the submerged entry nozzle affects two or more slabs, increasing the probability of surface quality defects. Furthermore, the nozzle replacement process creates joint marks on the slab surface, requiring the removal of 4-5m of the slab after cooling. In addition, the process of replacing the submerged entry nozzle requires manual control of the stopper rod and causes large fluctuations in the crystallizer level, increasing the risk of production accidents.

[0024] In view of this, the present application provides a control method for a steelmaking continuous casting system. This method replaces the submerged entry nozzle after the current slab has been cast but before the casting process is completed. This ensures that the replacement process of the submerged entry nozzle affects at most the current slab, thereby improving the slab yield and production quality.

[0025] The control method of the steelmaking continuous casting system according to an embodiment of this application will be described below with reference to the accompanying drawings.

[0026] Figure 1 A flowchart of a steelmaking continuous casting system control method according to an embodiment of this application is shown.

[0027] A first aspect of this application provides a control method for a steelmaking continuous casting system, the continuous casting system comprising: a tundish and a crystallizer, the method including but not limited to: Step S10. Before the tundish starts pouring molten steel into the crystallizer, obtain the first position of the stopper rod; It should be noted that in steelmaking continuous casting systems, stopper rods are typically installed at the bottom of the tundish. These rod-shaped flow control elements, made of refractory material, move up and down via an actuator. They cooperate with the tundish nozzle bowl to form a variable annular gap, thereby regulating the flow rate of molten steel from the tundish into the crystallizer. When the stopper rod rises, the annular gap increases, increasing the flow rate; conversely, when it falls, the annular gap decreases, reducing the flow rate, thus maintaining a stable liquid level in the crystallizer and a smooth casting process.

[0028] In step S10, before the tundish begins pouring molten steel into the crystallizer, the stopper rod is in the closed state, meaning the head of the stopper rod is in contact with the nozzle bowl, and the molten steel flow rate is zero. Therefore, the first position can be understood as the mechanically closed position of the stopper rod. This first position can serve as a reference point for adjusting the stopper rod position during subsequent replacement of the submerged nozzle, preventing incomplete stopper rod closure or inaccurate flow control due to accumulated positional errors, thus ensuring operational safety and control accuracy during the replacement of the submerged nozzle.

[0029] It is understandable that the moment when the tundish starts pouring molten steel into the crystallizer can be defined as the pouring start time. For example, the first position of the stopper rod can be obtained 5-10 seconds before the pouring start time.

[0030] Step S20. When the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches the preset length value, the slab pulling speed of pulling the slab out of the crystallizer is controlled to be reduced from the first pulling speed to the second pulling speed, so that the new submersible nozzle is pushed into the initial position in the crystallizer at the second pulling speed. In the continuous casting process, the real-time casting length of each slab can be detected. For example, starting from the meniscus of the crystallizer (i.e., the actual position of the molten steel surface within the crystallizer, considered the zero point of the slab length), high-precision rotary encoders are installed on multiple sets of straightening machine drive rollers arranged in the fan-shaped section area to measure the pulse signals generated as the slab passes through each roller table after being pulled out of the crystallizer. The control system calculates the cumulative slab length from the meniscus to the current cutting point by continuously integrating the roller diameter and the number of pulses. Furthermore, a laser rangefinder or non-contact infrared length sensor is installed in the roller table area before cutting. Using the principle of beam reflection, the positions of the slab's head and tail are precisely calibrated, and the values ​​are periodically compared and calibrated with the encoder calculations to eliminate cumulative errors caused by roller slippage or wear.

[0031] For example, the detection results of the real-time casting length of the slab can be displayed synchronously on the casting flow control panel for the operator to view.

[0032] In some embodiments, the method further includes: at the end of the casting of the previous slab in the crystallizer, controlling the opening of the sealing door of the quick-change mechanism at the bottom of the tundish and removing the blind plate of the tundish.

[0033] It should be noted that the quick-change mechanism is a mechanical device installed at the bottom of the tundish for quickly replacing the submersible nozzle. It includes a sealing gate, guide channel, and drive assembly. During normal casting, the sealing gate is closed, fixing the submersible nozzle below the tundish outlet; when it is necessary to replace the submersible nozzle, the sealing gate is opened.

[0034] For example, when the previous slab casting in the crystallizer is completed, the continuous casting process enters a transition phase where the previous slab and the current slab are joined. Based on this signal, the control system controls the quick-change mechanism at the bottom of the tundish to open. This mechanism, originally closed to secure the submerged entry nozzle and seal the molten steel outlet, provides a passage for removing the old nozzle and installing the new one. Secondly, it removes the blind flange from the tundish. The blind flange is a temporary sealing element made of refractory material, used to seal the molten steel outlet after the gate is opened to prevent leakage. Removing the blind flange releases the seal, allowing the molten steel to flow out again.

[0035] When the casting length of the current slab reaches the preset length value, such as 200mm, 210mm, or 220mm, the slab pulling speed from the crystallizer is controlled to be reduced from the first pulling speed to the second pulling speed.

[0036] It should be noted that when the casting length of the current slab reaches the preset length value, a sufficient safety distance is formed between the lower outlet of the submerged entry nozzle and the meniscus of the crystallizer. In the initial stage of casting, when the slab casting length is small, the submerged nozzle is shallowly immersed in the molten steel in the crystallizer. Its side outlet is close to or not yet completely below the meniscus. If the casting speed is reduced too early, the momentum and flow field of the molten steel flowing out of the nozzle side outlet have not yet stabilized, which can easily lead to violent fluctuations in the meniscus or even slag entrainment due to sudden changes in flow velocity. However, once the slab casting length reaches the preset value, it means that a slab of sufficient length has been pulled out of the crystallizer, and the molten steel level in the crystallizer has stabilized above the normal casting level. The submerged nozzle is immersed to the target depth, such as 100mm to 150mm, and its side outlet is submerged in the molten steel. The vertical distance between the nozzle and the meniscus has formed a stable molten steel buffer layer. Under these conditions, even if the molten steel flow rate decreases when the casting speed is reduced, the direct impact of the steel flow on the meniscus is weakened because the nozzle outlet is located deep enough below the liquid surface. Thus, the liquid level in the crystallizer remains stable under the low casting speed required for nozzle replacement.

[0037] In some embodiments, controlling the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed includes: controlling the slab pulling speed from the crystallizer to decrease from the first pulling speed to the second pulling speed according to a first acceleration, wherein the first acceleration is 3 m / min. 2 -6m / min 2 For example, 3m / min 2 4m / min 2 6m / min 2 6m / min 2 .

[0038] Understandably, the first acceleration is set to a relatively large deceleration rate of 3m / min² to 6m / min². The purpose is to shorten the duration of the deceleration process as much as possible while ensuring process stability, so that the replacement of the submersible nozzle can be completed within the time window before the current slab casting is completed, thereby reducing the number of slabs affected by the submersible nozzle replacement operation.

[0039] It should be noted that the initial position can be a temporary position that has just been pushed into the crystallizer but has not yet reached its final position. For example, after the liquid level in the crystallizer has stabilized for 15±5 seconds, the operator uses a special clamp for the immersion nozzle to horizontally and stably push the new immersion nozzle plate into the crystallizer along the direction of the quick-change mechanism slide and closes the quick-change mechanism sealing door.

[0040] Step S30. Obtain the second position of the stopper rod at the second casting speed, adjust the stopper rod from the second position to the first position, control the actuator to drive the new submersible nozzle from the initial position to the working position, and control the stopper rod to return to the second position; wherein, when the new submersible nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been cast.

[0041] In some embodiments, obtaining the second position of the stopper rod at the second pulling speed includes: After the second pulling speed is maintained for a first duration, the second position of the stopper rod at the second pulling speed is obtained, wherein the first duration is 40 seconds to 60 seconds, for example, 40 seconds, 45 seconds, 50 seconds, 55 seconds, 60 seconds, etc.

[0042] Understandably, when the slab casting speed decreases to the second casting speed, the volume of the slab drawn from the crystallizer per unit time decreases. To maintain the stability of the molten steel level in the crystallizer, the control system will adjust the stopper rod to move downwards to reduce the molten steel flow rate, so that the amount of molten steel flowing into the crystallizer and the amount of molten steel drawn out can be rebalanced. Therefore, the stopper rod position will gradually decrease from its original higher position to a new steady-state position that matches the second casting speed. This adjustment process is not instantaneous. The action response of the stopper rod actuator, the actual change in molten steel flow rate, and the liquid level detection and feedback control all require a certain stabilization time. If the stopper rod position is acquired immediately after the casting speed decreases, the stopper rod may still be in the process of dynamic adjustment, and the acquired position value is not the true position corresponding to the steady state of the second casting speed. Therefore, it is necessary to wait for a first period of time before acquiring the second position to ensure that the second position accurately reflects the actual flow control state under low casting speed conditions.

[0043] The stopper rod is adjusted from the second position to the first position, and the actuator is controlled to drive the new submerged entry nozzle from the initial position to the working position. Specifically, when the stopper rod is adjusted from the second position to the first position, the head of the stopper rod is in close contact with the nozzle bowl of the tundish, and the molten steel outflow channel is blocked. At this time, the molten steel in the tundish cannot flow into the crystallizer. This means that during the process of the operator driving the new submerged entry nozzle from the initial position (the temporary position where it has just been pushed into the crystallizer but has not yet reached its final position) to the working position (i.e., the normal casting position where the nozzle is installed in place and the side hole is aligned with the center of the wide face of the crystallizer), no new molten steel is injected into the crystallizer. This avoids the impact of the steel flow on the nozzle installation process and the risk of molten steel leakage or slag entrapment when the nozzle is not fully in place. After the actuator drives the new nozzle to the working position and confirms that the installation is firm and the alignment is accurate, the stopper rod position is restored through subsequent operations, and the molten steel flow can be re-established. This allows the nozzle to be replaced without interrupting casting and before the current slab is completed.

[0044] In some embodiments, after obtaining the second position of the stopper rod at the second pulling speed, the method further includes: controlling the molten steel level in the crystallizer to rise from the current level to a target level at a preset rate, and maintaining the target level for a second duration; wherein the preset rate is 120 mm / min-200 mm / min, for example 120 mm / min, 140 mm / min, 160 mm / min, 180 mm / min, 200 mm / min, and the second duration is 15 seconds-25 seconds, for example 15 seconds, 20 seconds, or 25 seconds.

[0045] It should be noted that after obtaining the second position and before adjusting the stopper rod to the first position, the molten steel level in the crystallizer should be controlled to rise from the current level to the target level at a rate of 120mm / min-200mm / min and maintained for 15-25 seconds. This provides a buffer space for the subsequent complete closure of the stopper rod. This is because after adjusting the stopper rod from the second position to the first position, the tundish stops injecting molten steel into the crystallizer, while the slab drawing speed remains at the second drawing speed (approximately 0.6m / min-0.7m / min). The molten steel in the crystallizer will continuously decrease due to only flowing out and not in. If the level is not raised before closing the stopper rod, the level may drop below the normal level (e.g., 100mm) after closure. An excessively low level can easily lead to accidents such as slag entrapment. By actively raising the liquid level to the target value (such as 120mm), a reserve of molten steel is prepared in advance. Even if the liquid level continues to drop during the installation of the nozzle after the stopper is closed, it can be maintained above the safe liquid level, thus providing a reliable liquid level safety guarantee for the nozzle replacement operation.

[0046] In some embodiments, after controlling the stopper rod to return to the second position, the method further includes: after the stopper rod has returned to the second position for a third time period, controlling the slab drawing speed to increase from the second drawing speed to the first drawing speed with a second acceleration, wherein the second acceleration is 0.2 m / min. 2 -0.3m / min 2 .

[0047] Understandably, when the stopper rod returns to its second position, although the new submerged nozzle is in place, the molten steel flow field within the mold is not yet fully stable, and the liquid surface equilibrium established at low casting speeds requires a certain amount of time to consolidate. Waiting for the third period allows for a sufficient transition in the molten steel temperature field, flow state, and molten protective slag layer around the side hole of the new nozzle. Slowly increasing the casting speed with a smaller acceleration avoids large fluctuations in the mold liquid surface or excessive impact on the steel flow at the nozzle side hole due to sudden changes in casting speed, ensuring that the new nozzle remains in a stable working state as it is gradually loaded to the normal casting speed.

[0048] In some embodiments, after controlling the slab drawing speed to increase from the second drawing speed to the first drawing speed with a second acceleration, the method further includes: Obtain the current casting length of the current slab when the slab casting speed reaches the first casting speed; The length of slab consumed by the continuous casting system during the replacement of the submerged entry nozzle is determined based on the current casting length.

[0049] Understandably, after the casting speed is restored to the first casting speed, the current casting length of the slab is obtained, and the length of the slab consumed during the replacement of the nozzle is determined accordingly, thereby providing a more accurate process parameter benchmark for subsequent nozzle replacement operations.

[0050] Based on the above disclosure, the steelmaking continuous casting system control method of this application embodiment includes a continuous casting system comprising: a tundish and a crystallizer. The method includes: before the tundish starts pouring molten steel into the crystallizer, obtaining a first position of a stopper rod; when the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches a preset length value, controlling the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed, so that a new submerged entry nozzle is pushed into the initial position in the crystallizer at the second pulling speed; obtaining a second position of the stopper rod at the second pulling speed, adjusting the stopper rod from the second position to the first position, controlling an actuator to drive the new submerged entry nozzle from the initial position to the working position, and controlling the stopper rod to return to the second position; wherein, when the new submerged entry nozzle reaches the working position and the stopper rod returns to the second position, the current slab casting is not yet completed. Therefore, in this embodiment of the application, the submerged gate is replaced after the current slab has been cast but before the casting process is completed. This ensures that the replacement process of the submerged gate affects at most the current slab, thereby improving the slab yield and production quality.

[0051] Figure 2 A structural diagram of a steelmaking continuous casting system control device according to an embodiment of this application is shown.

[0052] A second aspect of this application provides a control device 200 for a continuous casting system, the continuous casting system comprising: a tundish and a crystallizer, the device 200 comprising: Acquisition unit 201 is used to acquire the first position of the stopper rod before the tundish starts pouring molten steel into the crystallizer; The first control unit 202 is used to control the slab pulling speed of pulling out of the crystallizer from the first pulling speed to the second pulling speed when the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches the preset length value, so as to push the new submersible nozzle into the initial position in the crystallizer at the second pulling speed. The second control unit 203 is used to obtain the second position of the stopper rod at the second pulling speed, adjust the stopper rod from the second position to the first position, control the actuator to drive the new immersion nozzle from the initial position to the working position, and control the stopper rod to return to the second position. Specifically, when the new immersion nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been completed.

[0053] A third aspect of this application provides a computer-readable storage medium storing at least one computer program instruction, which is loaded and executed by a processor to perform the operations as described in any of the methods in the first aspect.

[0054] Computer-readable storage media may be portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the computer-readable storage medium of this application is not limited thereto. In this application, the readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0055] A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0056] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0057] A fourth aspect of this application provides an electronic device including one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation as described in any of the methods in the first aspect.

[0058] like Figure 3 As shown, the electronic device 400 is manifested in the form of a general-purpose computing device. The components of the electronic device 400 may include, but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including storage unit 420 and processing unit 410).

[0059] The storage unit stores program code, which can be executed by the processing unit 410, causing the processing unit 410 to perform the steps described in the "Embodiment Method" section above according to various exemplary embodiments of this application.

[0060] Storage unit 420 may include readable media in the form of volatile storage units, such as random access memory (RAM) 421 and / or cache 422, and may further include read-only memory (ROM) 423.

[0061] Storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0062] Bus 430 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0063] Electronic device 400 can also communicate with one or more external devices 500 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 400, and / or with any device that enables electronic device 400 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed through I / O (input / output) interface 450, which can also be connected to display unit 440 to display the communication content. Furthermore, electronic device 400 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public network, such as the Internet) through network adapter 460. As shown, network adapter 460 communicates with other modules of electronic device 400 via bus 430. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0064] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0066] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0067] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0068] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a steelmaking continuous casting system, characterized in that, The continuous casting system includes: a tundish and a crystallizer, and the method includes: Before the tundish begins pouring molten steel into the crystallizer, the first position of the stopper rod is obtained; When the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches the preset length value, the slab pulling speed from the crystallizer is controlled to be reduced from the first pulling speed to the second pulling speed, so that the new submersible nozzle is pushed into the initial position in the crystallizer at the second pulling speed. The second position of the stopper rod at the second pulling speed is obtained, the stopper rod is adjusted from the second position to the first position, the actuator is controlled to drive the new immersion nozzle from the initial position to the working position, and the stopper rod is controlled to return to the second position; Specifically, when the new immersion nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been completed.

2. The method according to claim 1, characterized in that, The control of reducing the slab pulling speed from the crystallizer from a first pulling speed to a second pulling speed includes: The slab pulling speed from the crystallizer is controlled to decrease from the first pulling speed to the second pulling speed according to the first acceleration, wherein the first acceleration is 3 m / min. 2 -6m / min 2 .

3. The method according to claim 1, characterized in that, The step of obtaining the second position of the stopper rod at the second pulling speed includes: After the second pulling speed is maintained for a first duration, the second position of the stopper rod at the second pulling speed is obtained, wherein the first duration is 40 seconds to 60 seconds.

4. The method according to claim 1, characterized in that, After obtaining the second position of the stopper rod at the second pulling speed, the method further includes: The molten steel level in the crystallizer is controlled to rise from the current level to the target level at a preset rate, and maintained at the target level for a second duration. The preset speed is 120mm / min-200mm / min, and the second duration is 15 seconds-25 seconds.

5. The method according to claim 1, characterized in that, After the stopper is returned to the second position, the method further includes: After the stopper rod returns to the second position for a third period of time, the slab drawing speed is controlled to increase from the second drawing speed to the first drawing speed with a second acceleration, wherein the second acceleration is 0.2 m / min. 2 -0.3m / min 2 .

6. The method according to claim 5, characterized in that, After controlling the slab drawing speed to increase from the second drawing speed to the first drawing speed with a second acceleration, the method further includes: Obtain the current casting length of the current slab when the slab casting speed reaches the first casting speed; The length of slab consumed by the continuous casting system during the replacement of the submerged entry nozzle is determined based on the current casting length.

7. The method according to claim 1, characterized in that, The method further includes: When the previous slab casting in the crystallizer is completed, the sealing door of the quick-change mechanism at the bottom of the tundish is opened and the blind plate of the tundish is removed.

8. A control device for a steelmaking continuous casting system, characterized in that, The continuous casting system includes: a tundish and a crystallizer, and the apparatus includes: The acquisition unit is used to acquire the first position of the stopper rod before the tundish starts pouring molten steel into the crystallizer; The first control unit is used to control the slab pulling speed from the crystallizer to decrease from a first pulling speed to a second pulling speed when the previous slab casting in the crystallizer is completed and the casting length of the current slab reaches a preset length value, so as to push the new submersible nozzle into the initial position in the crystallizer at the second pulling speed. The second control unit is used to obtain the second position of the stopper rod at the second pulling speed, adjust the stopper rod from the second position to the first position, control the actuator to drive the new immersion nozzle from the initial position to the working position, and control the stopper rod to return to the second position. Specifically, when the new immersion nozzle reaches the working position and the stopper rod returns to the second position, the current slab has not been completed.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program instruction, which is loaded and executed by a processor to perform the operation as described in any one of claims 1-7.

10. An electronic device, characterized in that, It includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation performed by the method as described in any one of claims 1-7.

Images