Method and device for controlling back taper of continuous casting crystallizer

Abstract

The invention discloses a method and device for controlling the reverse taper of a continuous casting crystallizer. The method comprises the steps that the running state of a continuous casting machine and the steel type of a casting blank are obtained; according to the running state of the continuous casting machine and the steel type of the casting blank, the corresponding reverse taper of the narrow face of the crystallizer of the casting blank in different running states is determined; and controlling the operation of the crystallizer in the continuous casting machine according to the reverse taper of the narrow surface of the crystallizer. In this way, the situation that casting cannot be continued due to casting blank width defects and precision deviation caused by abnormal operation conditions such as casting starting, shutdown and casting speed reduction in the continuous casting process can be reduced, and the production quality of the casting blank is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a method and apparatus for controlling the inverted taper of a continuous casting crystallizer. Background Technology

[0002] In a continuous casting machine, the copper plate of the crystallizer can freely change the size of the upper and lower openings of the crystallizer in the non-pouring state under the action of its back plate. However, in the pouring state, the ratio of the upper and lower openings of the crystallizer is fixed, that is, the inverted taper of the crystallizer remains unchanged.

[0003] However, due to abnormal operations such as starting pouring, stopping the machine, and reducing the pouring speed during continuous steel casting, the billet head and shell in the crystallizer are affected by continuous cooling and shrinkage under these abnormal operations. The solidification shrinkage of the billet (bill head or shell) formed under these abnormal operations is small in the crystallizer and after exiting the crystallizer. As a result, the billet formed is wider than the planned billet specifications, resulting in quality defects. Furthermore, due to differences in steel grade and crystallizer selection, the narrow face taper of the crystallizer is required to be larger. A large taper of the crystallizer results in a relatively small width of the crystallizer outlet and the crystallizer foot roll, which increases the external tension on the lower opening of the crystallizer or the foot roll. This leads to the loss of the crystallizer taper function and excessive accuracy deviation, resulting in the interruption of continuous pouring. Summary of the Invention

[0004] In view of the above problems, the present invention provides a method and device for controlling the inverted taper of a continuous casting crystallizer, which solves the technical problems of billet width defects, loss of the inverted taper function of the narrow face of the crystallizer, or inability to continue casting due to abnormal operation conditions such as start-up, shutdown, and reduction of casting speed during continuous steel casting.

[0005] According to a first aspect of the present invention, a method for controlling the inverted taper of a continuous casting crystallizer is provided, comprising:

[0006] Obtain the operating status of the continuous casting machine and the steel grade of the billet;

[0007] Based on the operating status of the continuous casting machine and the steel grade of the billet, determine the narrow taper of the crystallizer face corresponding to the billet under different operating conditions;

[0008] The operation of the crystallizer in the continuous casting machine is controlled according to the inverted taper of the narrow face of the crystallizer.

[0009] Optionally, the operating states of the continuous casting machine include:

[0010] Normal pouring state, pouring start state, machine stop and start state, and low-speed pouring state.

[0011] Optionally, determining the narrow taper of the crystallizer face corresponding to different operating states of the billet based on the operating state of the continuous casting machine and the steel grade of the billet includes:

[0012] When the steel grade of the billet is peritectic steel, if the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.25%; if the continuous casting machine is in open casting state, the narrow face taper of the crystallizer is 1%; if the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.1%; and if the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.15%.

[0013] Optionally, the method further includes:

[0014] If the carbon content of the steel grade of the billet is greater than that of the peritectic steel, then when the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.3%; when the continuous casting machine is in start-up state, the narrow face taper of the crystallizer is 1.1%; when the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.2%; and when the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.25%.

[0015] Optionally, the method further includes:

[0016] If the carbon content of the steel grade of the billet is less than that of the peritectic steel, then when the continuous casting machine is in normal casting mode, the narrow face taper of the crystallizer is 1.15%; when the continuous casting machine is in start-up mode, the narrow face taper of the crystallizer is 1%; when the continuous casting machine is in stop-start mode, the narrow face taper of the crystallizer is 1.05%; and when the continuous casting machine is in low-speed casting mode, the narrow face taper of the crystallizer is 1.1%.

[0017] Optionally, the low-speed casting state refers to a continuous casting machine with a billet pulling speed of less than 1.2 m / s.

[0018] Optionally, the minimum value of the inverted taper of the narrow face of the crystallizer is 1%.

[0019] According to a second aspect of the present invention, a continuous casting crystallizer taper control device is provided, comprising:

[0020] The acquisition module is used to acquire the operating status of the continuous casting machine and the steel type of the billet;

[0021] The determination module is used to determine the narrow face taper of the crystallizer corresponding to different operating states of the continuous casting machine and the steel grade of the billet.

[0022] The control module is used to control the operation of the crystallizer in the continuous casting machine according to the inverted taper of the narrow face of the crystallizer.

[0023] According to a third aspect of the present invention, a controller is provided, the controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the aforementioned continuous casting crystallizer taper control method.

[0024] According to a fourth aspect of the present invention, a continuous casting machine is provided, comprising at least a crystallizer and a controller, the controller performing the aforementioned continuous casting crystallizer taper control method.

[0025] The above-described one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0026] This specification provides a method and apparatus for controlling the taper of a continuous casting mold. It acquires the operating status of the continuous casting machine and the steel grade of the cast billet; determines the narrow taper of the mold face corresponding to different operating states of the cast billet based on the operating status of the continuous casting machine and the steel grade of the cast billet; and controls the operation of the mold in the continuous casting machine based on the narrow taper of the mold face. In this way, the situation where casting width defects or precision deviations in the cast billet cannot continue due to abnormal operating conditions such as start-up, shutdown, and reduced casting speed during continuous steel casting can be reduced, ensuring the production quality of the cast billet.

[0027] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 A flowchart of a method for controlling the inverted taper of a continuous casting crystallizer according to an embodiment of the present invention is shown.

[0030] Figure 2 A block diagram of a continuous casting crystallizer inverted taper control device is shown in an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Combination Figure 1 As shown, the present invention provides a method for controlling the inverted taper of a continuous casting mold, the method comprising steps 101 to 103:

[0036] Step 101: Obtain the operating status of the continuous casting machine and the steel grade of the billet;

[0037] In this embodiment, a continuous casting machine is a device that continuously casts liquid metal into solid billets. The molten steel is initially solidified into a billet shell through a crystallizer, then further solidified in a secondary cooling zone, and finally pulled out and cut into fixed-length billets by a straightening machine.

[0038] The crystallizer is one of the core components of a continuous casting machine. Molten steel cools and solidifies within the crystallizer to form the initial shell of the billet. Crystallizers are typically made of copper or stainless steel plates and have an internal cooling water circulation system to accelerate the solidification rate of the molten steel. The taper value of the crystallizer refers to the ratio of the change in diameter (or side length) of the inner and outer surfaces along the height direction to the height itself, usually expressed as a percentage or angle. The taper design of the crystallizer is primarily to compensate for the shrinkage of the billet during solidification. As the billet solidifies within the crystallizer, it shrinks in volume due to the decrease in temperature. A proper taper ensures good contact between the billet and the crystallizer wall, which is beneficial for heat transfer and uniform shell growth. A narrow-face inverted taper of the crystallizer means that the upper opening of the crystallizer is larger than the lower opening; that is, the cross-sectional dimensions gradually decrease along the height direction of the crystallizer, and its taper is positive (if the lower opening is larger than the upper opening, it is a negative taper).

[0039] In this embodiment, the continuous casting machine's operating states include normal casting, start-up casting, shutdown and restart casting, and low-speed casting. Sensors are deployed at key equipment points of the continuous casting machine, such as billet speed sensors, crystallizer vibration parameter sensors, and ladle sliding gate opening sensors. The billet speed sensor monitors the billet pulling speed in real time, and combined with preset thresholds, it can determine whether the continuous casting machine is in normal casting (bill pulling speed is stable within ±5% of the set value), start-up casting (the initial stage where the billet pulling speed gradually increases from 0 to the set value), shutdown and restart casting (the transition stage where the billet pulling speed decreases from the operating state to 0 or starts from 0), or low-speed casting (the billet pulling speed is lower than 50%-80% of the normal set value, or the continuous casting machine's billet pulling speed is less than 1.2 m / s).

[0040] In this embodiment, after the steelmaking process is completed, the billet steel grade information is entered into the production management system and transmitted to the control system of the continuous casting machine via a data interface. Simultaneously, a spectrometer can be installed at the molten steel receiving position of the continuous casting machine to perform rapid compositional analysis of the molten steel entering the crystallizer, providing dual verification of the billet steel grade and ensuring information accuracy.

[0041] Step 102: Determine the narrow taper of the crystallizer face corresponding to the billet under different operating conditions based on the operating status of the continuous casting machine and the steel grade of the billet;

[0042] In this embodiment, differentiated taper control strategies can be formulated based on the solidification characteristics and billet growth patterns of different steel grades under various operating conditions.

[0043] For example, if the steel grade of the billet is peritectic steel, the carbon content is around 0.08-0.14%. Peritectic steel undergoes significant volume shrinkage during solidification and is sensitive to changes in taper.

[0044] Under normal casting conditions, the inverted taper of the narrow face of the crystallizer is set to 1.25%. During this stage, the billet production is stable, and the higher inverted taper can compensate for the solidification shrinkage of peritectic steel, ensure close contact between the crystallizer and the billet, promote uniform growth of the billet shell, and prevent premature formation of air gaps that would affect heat transfer efficiency.

[0045] During the initial pouring phase, the taper of the narrow face of the crystallizer is adjusted to 1%. In the early stages of pouring, the molten steel flow is unstable, and a lower taper can reduce the constraint of the crystallizer on the billet, thereby reducing the risk of surface defects on the billet caused by molten steel impact and uneven solidification.

[0046] In the shutdown and startup state, the taper of the narrow face of the crystallizer is set to 1.1%. During this stage, the billet's operating state changes drastically. An appropriate taper can ensure the stability of the billet when the speed changes, and also avoid increasing the billet pulling resistance due to excessive taper, which would affect the operation of the equipment.

[0047] During low-speed casting, the taper of the narrow face of the crystallizer is 1.15%. At low speeds, the billet spends a longer time in the crystallizer, necessitating taper adjustment to control the billet shell growth rate and prevent excessive shell thickness that could lead to difficulties in casting or a decline in surface quality.

[0048] In actual production, the billet may also be made of other steel grades. For example, the billet may be made of low carbon steel with a carbon content lower than that of peritectic steel (such as a carbon content of about 0.03-0.07%), or medium carbon steel with a carbon content higher than that of peritectic steel (such as a carbon content of about 0.14-0.25%).

[0049] To address the above situation, the narrow face taper of the crystallizer can be adjusted according to the carbon content of the steel grade, using peritectic steel as a benchmark. Specifically, if the carbon content is higher than that of peritectic steel, the narrow face taper of the crystallizer corresponding to each operating state should be appropriately increased; if the carbon content is lower than that of peritectic steel, the narrow face taper of the crystallizer corresponding to each operating state should be appropriately decreased.

[0050] Specifically, if the carbon content of the steel grade of the billet is greater than that of the peritectic steel, then when the continuous casting machine is in normal casting mode, the narrow face taper of the crystallizer is 1.3%; when the continuous casting machine is in start-up mode, the narrow face taper of the crystallizer is 1.1%; when the continuous casting machine is in stop-start mode, the narrow face taper of the crystallizer is 1.2%; and when the continuous casting machine is in low-speed casting mode, the narrow face taper of the crystallizer is 1.25%.

[0051] If the carbon content of the steel grade of the billet is less than that of the peritectic steel, then when the continuous casting machine is in normal casting mode, the narrow face taper of the crystallizer is 1.15%; when the continuous casting machine is in start-up mode, the narrow face taper of the crystallizer is 1%; when the continuous casting machine is in stop-start mode, the narrow face taper of the crystallizer is 1.05%; and when the continuous casting machine is in low-speed casting mode, the narrow face taper of the crystallizer is 1.1%.

[0052] It should be noted that in this embodiment, the minimum value of the inverted taper of the narrow face of the crystallizer is 1%, and it cannot be reduced further.

[0053] Step 103: Control the operation of the crystallizer in the continuous casting machine according to the inverted taper of the narrow face of the crystallizer.

[0054] In this embodiment, an electrically or hydraulically driven crystallizer narrow face adjustment mechanism can be used to precisely control the crystallizer based on the calculated inverted taper of the crystallizer narrow face.

[0055] The electric adjustment mechanism is equipped with a high-precision servo motor and ball screw transmission system, with a position control accuracy of ±0.05mm; the hydraulic adjustment mechanism adopts closed-loop control with electro-hydraulic servo valve and displacement sensor, with fast response speed, which can meet the needs of rapid adjustment in the continuous casting process.

[0056] Multiple high-precision displacement sensors are installed on the narrow copper plate of the crystallizer to monitor changes in the narrow face position in real time. The actual position of the narrow face is compared with the theoretical position corresponding to the inverted taper of the crystallizer's narrow face. The adjustment mechanism is automatically adjusted through a PID control algorithm to ensure that the inverted taper of the crystallizer's narrow face is always kept within the set value ±0.05% error range. When an abnormal deviation occurs, an alarm is immediately issued, and compensatory adjustment measures are automatically taken or the operator is prompted to intervene.

[0057] In summary, the continuous casting crystallizer taper control method provided in this specification involves acquiring the operating status of the continuous casting machine and the steel grade of the billet; determining the narrow face taper of the crystallizer corresponding to different operating states of the billet based on the operating status of the continuous casting machine and the steel grade of the billet; and controlling the operation of the crystallizer in the continuous casting machine based on the narrow face taper of the crystallizer. This reduces the occurrence of billet width defects and precision deviations that prevent continued casting due to abnormal operating conditions such as start-up, shutdown, and reduced casting speed during continuous steel casting. It improves billet quality, effectively reduces surface cracks and shrinkage cavities, and significantly improves internal quality. Simultaneously, it enhances production stability, reduces the incidence of production accidents such as steel leakage and adhesion, and reduces downtime for maintenance.

[0058] Based on the same inventive concept, combined with Figure 2As shown, this embodiment of the invention also provides a continuous casting crystallizer inverted taper control device, comprising:

[0059] The acquisition module is used to acquire the operating status of the continuous casting machine and the steel type of the billet;

[0060] The determination module is used to determine the narrow face taper of the crystallizer corresponding to different operating states of the continuous casting machine and the steel grade of the billet.

[0061] The control module is used to control the operation of the crystallizer in the continuous casting machine according to the inverted taper of the narrow face of the crystallizer.

[0062] Optionally, the operating states of the continuous casting machine include:

[0063] Normal pouring state, pouring start state, machine stop and start state, and low-speed pouring state.

[0064] Optionally, the determination module is also used for:

[0065] When the steel grade of the billet is peritectic steel, if the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.25%; if the continuous casting machine is in open casting state, the narrow face taper of the crystallizer is 1%; if the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.1%; and if the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.15%.

[0066] Optionally, the determination module is also used for:

[0067] If the carbon content of the steel grade of the billet is greater than that of the peritectic steel, then when the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.3%; when the continuous casting machine is in start-up state, the narrow face taper of the crystallizer is 1.1%; when the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.2%; and when the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.25%.

[0068] Optionally, the determination module is also used for:

[0069] If the carbon content of the steel grade of the billet is less than that of the peritectic steel, then when the continuous casting machine is in normal casting mode, the narrow face taper of the crystallizer is 1.15%; when the continuous casting machine is in start-up mode, the narrow face taper of the crystallizer is 1%; when the continuous casting machine is in stop-start mode, the narrow face taper of the crystallizer is 1.05%; and when the continuous casting machine is in low-speed casting mode, the narrow face taper of the crystallizer is 1.1%.

[0070] Optionally, the low-speed casting state refers to a continuous casting machine billet pulling speed of less than 1.2 m / s.

[0071] Optionally, the minimum value of the inverted taper of the narrow face of the crystallizer is 1%.

[0072] In summary, the continuous casting crystallizer taper control method and apparatus provided in this specification acquire the operating status of the continuous casting machine and the steel grade of the billet; determine the narrow face taper of the crystallizer corresponding to different operating states of the billet based on the operating status of the continuous casting machine and the steel grade of the billet; and control the operation of the crystallizer in the continuous casting machine based on the narrow face taper of the crystallizer. In this way, the situation where billet width defects or precision deviations prevent continued casting due to abnormal operating conditions such as start-up, shutdown, and reduced casting speed can be reduced during continuous steel casting, ensuring the production quality of the billet.

[0073] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the continuous casting crystallizer inverted taper control device described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0074] Based on the same inventive concept, this embodiment provides a controller, including a continuous casting crystallizer taper control device, a memory, a processor, and a communication unit. The memory stores machine-readable instructions that can be executed by the processor. When the controller is running, the processor and the memory communicate through a bus. The processor executes the machine-readable instructions and performs the continuous casting crystallizer taper control method.

[0075] The memory, processor, and communication unit are electrically connected directly or indirectly to achieve signal transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The continuous casting mold taper control device includes at least one software function module that can be stored in the memory in the form of software or firmware. The processor is used to execute the executable module stored in the memory (e.g., the software function module or computer program included in the continuous casting mold taper control device).

[0076] The memory can be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc.

[0077] In some embodiments, the processor is used to perform one or more functions described in this embodiment. In some embodiments, the processor may include one or more processing cores (e.g., a single-core processor (S) or a multi-core processor (S)). By way of example only, the processor may include a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), an Application Specific Instruction-set Processor (ASIP), a Graphics Processing Unit (GPU), a Physics Processing Unit (PPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a controller, a microcontroller unit, a Reduced Instruction Set Computing (RISC) computer, or a microprocessor, or any combination thereof.

[0078] For ease of explanation, only one processor is described in the controller. However, it should be noted that the controller in this embodiment may also include multiple processors, and therefore the steps performed by one processor as described in this embodiment may also be performed jointly or individually by multiple processors. For example, if the server's processor performs steps A and B, it should be understood that steps A and B may also be performed jointly by two different processors or individually by one processor. For example, one processor performs step A, and a second processor performs step B, or the first and second processors jointly perform steps A and B.

[0079] In this embodiment, the memory is used to store the program, and the processor is used to execute the program after receiving the execution instruction. The process definition method disclosed in any implementation of this embodiment can be applied to the processor, or implemented by the processor.

[0080] The communication unit is used to establish communication connections between the controller and other devices via the network, and to send and receive data via the network.

[0081] In some implementations, the network can be any type of wired or wireless network, or a combination thereof. By way of example only, the network may include wired networks, wireless networks, fiber optic networks, telecommunications networks, intranets, the Internet, local area networks (LANs), wide area networks (WANs), wireless local area networks (WLANs), metropolitan area networks (MANs), public switched telephone networks (PSTNs), Bluetooth networks, ZigBee networks, or near field communication (NFC) networks, or any combination thereof.

[0082] In this embodiment, the controller can be, but is not limited to, a workstation, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), or other controllers. This embodiment does not impose any restrictions on the specific type of controller.

[0083] Based on the same inventive concept, embodiments of the present invention also provide a continuous casting machine, including at least a crystallizer and a controller, wherein the controller executes the aforementioned continuous casting crystallizer taper control method.

[0084] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the controller described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0085] The above are merely various embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the inverted taper of a continuous casting crystallizer, characterized in that, include: Obtain the operating status of the continuous casting machine and the steel grade of the billet; Based on the operating status of the continuous casting machine and the steel grade of the billet, determine the narrow taper of the crystallizer face corresponding to the billet under different operating conditions; The operation of the crystallizer in the continuous casting machine is controlled according to the inverted taper of the narrow face of the crystallizer.

2. The method according to claim 1, characterized in that, The operating status of the continuous casting machine includes: Normal pouring state, pouring start state, machine stop and start state, and low-speed pouring state.

3. The method according to claim 2, characterized in that, The step of determining the narrow taper of the crystallizer face corresponding to different operating states of the casting billet based on the operating state of the continuous casting machine and the steel grade of the casting billet includes: When the steel grade of the billet is peritectic steel, if the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.25%; if the continuous casting machine is in open casting state, the narrow face taper of the crystallizer is 1%; if the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.1%; and if the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.15%.

4. The method according to claim 3, characterized in that, The method further includes: If the carbon content of the steel grade of the billet is greater than that of the peritectic steel, then when the continuous casting machine is in normal casting state, the narrow face taper of the crystallizer is 1.3%; when the continuous casting machine is in start-up state, the narrow face taper of the crystallizer is 1.1%; when the continuous casting machine is in stop-start state, the narrow face taper of the crystallizer is 1.2%; and when the continuous casting machine is in low-speed casting state, the narrow face taper of the crystallizer is 1.25%.

5. The method according to claim 3, characterized in that, The method further includes: If the carbon content of the steel grade of the billet is less than that of the peritectic steel, then when the continuous casting machine is in normal casting mode, the narrow face taper of the crystallizer is 1.15%; when the continuous casting machine is in start-up mode, the narrow face taper of the crystallizer is 1%; when the continuous casting machine is in stop-start mode, the narrow face taper of the crystallizer is 1.05%; and when the continuous casting machine is in low-speed casting mode, the narrow face taper of the crystallizer is 1.1%.

6. The method according to claim 2, characterized in that, The low-speed casting state refers to the state where the billet pulling speed of the continuous casting machine is less than 1.2m / s.

7. The method according to claim 1, characterized in that, The minimum value of the inverted taper of the narrow face of the crystallizer is 1%.

8. A device for controlling the inverted taper of a continuous casting crystallizer, characterized in that, include: The acquisition module is used to acquire the operating status of the continuous casting machine and the steel type of the billet; The determination module is used to determine the narrow face taper of the crystallizer corresponding to different operating states of the continuous casting machine and the steel grade of the billet. The control module is used to control the operation of the crystallizer in the continuous casting machine according to the inverted taper of the narrow face of the crystallizer.

9. A controller, characterized in that, The controller 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 continuous casting crystallizer taper control method according to any one of claims 1-7.

10. A continuous casting machine, characterized in that, It includes at least a crystallizer and a controller, the controller performing the continuous casting crystallizer taper control method according to any one of claims 1-7.

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