Dynamic control method for emulsion at inlet side of tail rack of tandem cold mill and related equipment

Abstract

The invention discloses a dynamic control method for emulsified liquid on the inlet side of a tail rack of a tandem cold rolling mill and related equipment, and relates to the technical field of cold-rolled strip steel, the method comprises the steps that current rolling parameters in the production process of the tandem cold rolling mill are obtained, and the current rolling parameters comprise strip steel specification parameters and real-time rolling speed of the tail rack of the tandem cold rolling mill; on the basis of the strip steel specification parameters and the real-time rolling speed, dynamic control parameters of emulsion on the inlet side of the tail rack of the tandem cold mill and the compensation number of side nozzles are determined; on the basis of the dynamic control parameters, emulsion on the inlet side of the tail rack of the tandem cold mill is controlled to execute the injection action; and on the basis of the compensation number, an emulsion edge nozzle on the inlet side of the end rack of the tandem cold mill is controlled to execute opening and closing actions.

Description

Technical Field

[0001] This application relates to the field of cold-rolled strip steel technology, and in particular to a dynamic control method and related equipment for the emulsion on the inlet side of the last stand of a cold continuous rolling mill. Background Technology

[0002] Emulsions play an important role in process lubrication and cooling during cold rolling. However, if the emulsion on the surface of the finished strip is not completely removed, it will cause emulsion residue defects and affect the surface quality of the strip.

[0003] Current cold rolling mills are mainly divided into two categories: single-stand mills and continuous rolling mills. Single-stand mills employ multi-pass reversible rolling with short intervals between passes and relatively low rolling speeds. They are typically equipped with wiping devices, squeezing devices, and air purging systems to remove emulsion from the strip surface. Continuous rolling mills, on the other hand, are irreversible unidirectional cold rolling mills with rolling speeds reaching up to 1700 mpm. For continuous cold rolling mills, an emulsion spraying system is installed at the entrance side of the last stand for process lubrication and cooling, and an air purging device is installed at the exit side of the last stand, using compressed air to powerfully remove emulsion from the strip surface.

[0004] Cold continuous rolling mills use compressed air purging at the last stand outlet to remove emulsion from the strip surface. However, in actual production, due to frequent changes in rolling speed and issues with air purging accuracy, residual emulsion often appears on the strip surface. When this happens, most methods to control the residual emulsion are to increase the outlet air purging pressure, add more air purging spray beams, or reduce the inlet emulsion spray volume. However, these methods are not very effective and also increase energy costs. Summary of the Invention

[0005] This application introduces a series of simplified concepts in its summary section, which will be further explained in detail in the detailed description section. The summary section of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] This application specifically includes the following aspects: In a first aspect, this application proposes a method for dynamic control of the emulsion on the inlet side of the last stand of a cold rolling mill, comprising: Obtain the current rolling parameters during the production process of the cold rolling mill, wherein the current rolling parameters include the strip specifications and real-time rolling speed of the last stand of the cold rolling mill; Based on the strip steel specifications and the real-time rolling speed, the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold continuous rolling mill and the compensation quantity of the edge nozzles are determined. Based on the aforementioned dynamic control parameters, the emulsion on the inlet side of the last stand of the cold rolling mill is controlled to perform a spraying action. Based on the compensation amount, the inlet-side emulsion edge nozzle of the last stand of the cold rolling mill is controlled to perform a switching action.

[0007] In one feasible implementation, the dynamic control parameters include a first pressure threshold for the roll gap lubrication zone and a first flow rate threshold for the roll body cooling zone; based on the strip steel specification parameters and the real-time rolling speed, the dynamic control parameters of the inlet-side emulsion of the last stand of the cold continuous rolling mill are determined, including: Based on the strip width and strip thickness in the strip specifications, a first preset pressure threshold table is matched to determine the reference pressure value of the roll gap lubrication zone; Based on the comparison result between the real-time rolling speed and the first preset speed level, the reference pressure value is corrected to generate the first pressure threshold. Based on the strip width and strip thickness in the strip specifications, a first preset flow threshold table is matched to determine the reference flow value of the roller cooling zone; Based on the comparison result between the real-time rolling speed and the second preset speed range, the reference flow rate value is calculated to generate the first flow rate threshold.

[0008] In one feasible implementation, the step of performing flow compensation calculation on the reference flow rate value based on the comparison result between the real-time rolling speed and the second preset speed range to generate the first flow rate threshold includes: When the real-time rolling speed falls into the first speed range, the reference flow rate value is amplified and calculated based on the first preset compensation ratio to generate the first flow rate threshold. When the real-time rolling speed falls into the second speed range, the reference flow rate value is amplified based on the second preset compensation ratio to generate the first flow rate threshold. The lowest speed in the second speed range is greater than the highest speed in the first speed range, and the second preset compensation ratio is greater than the first preset compensation ratio.

[0009] In one feasible implementation, it further includes: Before the coiler of the cold rolling mill performs the coil changing operation, the current coil weight parameters and the strip specification parameters of the mandrel at the strip threading position of the coiler are obtained. Based on the current roll weight parameters and the equipment limit roll weight of the winding machine, the target roll weight difference is determined; Based on the target coil weight difference and the strip steel specification parameters, the target rolling speed of the strip threading rolling stage of the cold continuous rolling mill is determined; Based on the target rolling speed, the cold continuous rolling mill is controlled to perform rolling operations.

[0010] In one feasible implementation, determining the target rolling speed of the strip threading stage of the cold continuous rolling mill based on the target coil weight difference and the strip specification parameters includes: Based on the raw material thickness, finished product thickness, and strip width in the strip specifications, the elongation coefficient and cross-sectional area of ​​the strip are determined. Based on the target coil weight difference, the cross-sectional area, the strip density, and the preset coiling duration, the base speed value of the mandrel at the threading position is determined; Based on the elongation coefficient and the preset compensation coefficient, the base speed value is corrected to generate the target rolling speed.

[0011] In one feasible implementation, the compensation quantity of the edge nozzles of the emulsion on the inlet side of the last stand of the cold rolling mill is determined based on the strip steel specification parameters and the real-time rolling speed, including: Based on the strip thickness and strip width in the strip specifications, the reference compensation value of the edge nozzle is determined by matching the first preset compensation parameter table. Based on the comparison result between the real-time rolling speed and the third preset speed level, the benchmark compensation value is corrected to generate the target compensation value. Based on the target compensation value, the number of side nozzles that need to be closed is determined as the compensation quantity.

[0012] In one feasible implementation, determining the number of side nozzles that need to be closed, based on the target compensation value, as the compensation quantity, includes: When the target compensation value is zero, the compensation quantity is determined to be zero, and the current side nozzle opening state is maintained; When the target compensation value is negative, the absolute value of the target compensation value is determined as the number of side nozzles that need to be closed, and this number is used as the compensation quantity.

[0013] Secondly, this application proposes a dynamic control system for the emulsion on the inlet side of the last stand of a cold rolling mill, applied to the dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill as described in any of the above embodiments, comprising: The data acquisition module is used to acquire the current rolling parameters during the production process of the cold rolling mill, wherein the current rolling parameters include the strip specifications and real-time rolling speed of the last stand of the cold rolling mill; The data calculation module is used to determine the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold rolling mill and the compensation quantity of the edge nozzles based on the strip steel specification parameters and the real-time rolling speed. The first action module is used to control the emulsion on the inlet side of the last stand of the cold rolling mill to perform a spraying action based on the dynamic control parameters. The second action module is used to control the inlet-side emulsion edge nozzle of the last stand of the cold rolling mill to perform a switching action based on the compensation quantity.

[0014] Thirdly, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the dynamic control method for the inlet side emulsion of the cold continuous rolling mill as described in any of the first aspects above.

[0015] Fourthly, this application also proposes a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the dynamic control method for the emulsion on the inlet side of the last stand of the cold continuous rolling mill as described in any of the first aspects.

[0016] In summary, the dynamic control method for the emulsion on the inlet side of the last stand in a cold continuous rolling mill proposed in this application includes dynamic zone control of the emulsion in the S5 mill, a free speed-up function for the mill, and an automatic compensation system for the edge nozzles of the emulsion, forming a method for eliminating residual defects in the emulsion based on a cold continuous rolling mill. This method, without changing the equipment structure or increasing energy consumption, achieves intelligent and dynamic control of the emulsion, rolling speed, and edge nozzles through the development of a series of functions. It solves the problem of residual defects in the emulsion during the endless rolling process in a cold continuous rolling mill, improving the quality level and production efficiency of the production line. Through the implementation of this method, the degradation of residual defects in the emulsion is reduced.

[0017] The dynamic control method for the emulsion on the inlet side of the last stand of the cold rolling mill proposed in this application, along with other advantages, objectives and features of this application, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0018] 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 this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart illustrating a dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill, provided as an embodiment of this application; Figure 2 A schematic diagram of an S5 rack emulsion spraying device and an air purging system provided in this application embodiment; Figure 3 This application provides a schematic diagram of a winding machine operation process. Figure 4 An ideal speed cone and actual speed curve of a rolling mill are provided for embodiments of this application; Figure 5 A schematic diagram of the strip roll gap provided in an embodiment of this application; Figure 6 A schematic diagram illustrating the relationship between the number of emulsion nozzles opened and the strip steel, provided in an embodiment of this application; Figure 7 A schematic diagram of a cold continuous rolling mill and a coiler provided in an embodiment of this application; Figure 8 A schematic diagram of the functional modules of a dynamic control system for the emulsion on the inlet side of the last stand of a cold continuous rolling mill, provided for an embodiment of this application; Figure 9 This is a schematic diagram of an electronic device for dynamic control of emulsion on the inlet side of the last stand of a continuous rolling mill, provided as an embodiment of this application. Detailed Implementation

[0019] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0020] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0021] See Figure 2In the existing technical process, during the production of a cold continuous rolling mill, an emulsion spraying system is installed on the inlet side of the last stand for process lubrication and cooling. An air purging device is installed on the outlet side of the last stand, using compressed air to powerfully remove the emulsion from the surface of the strip. As shown in the figure, the rolling direction is fixed unidirectional rolling. During the strip rolling process, the emulsion device on the inlet side of the S5 stand sprays emulsion, with zone 14 spraying the emulsion into the roll gap area where the work roll and the strip contact, and zone 15 spraying the emulsion onto the roll surface of the work roll. On the outlet side of the S5 stand, the air purging device sprays high-speed compressed air in zone 16 to remove the emulsion from the strip surface, and zone 17 is a suction cup type purging device where compressed air forms a negative pressure zone to adsorb residual emulsion in the strip.

[0022] However, existing technologies have many drawbacks. First, the emulsion flow rate in each zone of the 5-stand mill is controlled by a fixed flow rate parameter; that is, the emulsion flow rate through zones 14 and 15 is constant during the rolling mill production process. This mismatch between the rolling speed and flow rate, coupled with the constant emulsion flow rate during rolling, leads to a situation where, during high-speed rolling, the amount of emulsion per unit area of ​​strip surface decreases, allowing the air purging system to effectively remove the emulsion. However, during low-speed rolling, the amount of emulsion per unit area of ​​strip surface increases, making it impossible for the air purging system to completely remove the emulsion, resulting in emulsion residue on the strip surface.

[0023] Secondly, the cold rolling mill adopts a headless rolling method, where the tail of the previous coil and the head of the next coil are connected sequentially by a welding machine to ensure uninterrupted continuous operation of the production line. After each coil of strip is rolled, the connected strips are separated by a flying shear, and then a coiler is used to coil the strip. The coiler uses two mandrels to alternately coil, ensuring continuous production of the cold rolling mill unit. Figure 3 As shown: The strip is centered around a mandrel 21 at the threading position, a mandrel 22 at the coiling position, an outer support 23 at the coiling position, and a coiler disc 24. After the strip weld is sheared, it is coiled at the mandrel 21 at the threading position. After a certain coiling time, the coiler disc 24 begins to rotate. After rotating 180 degrees, the mandrel at the threading position moves to the coiling position, and the outer support 23 at the coiling position is in place, before high-speed coiling begins. Due to equipment capacity limitations, the coil weight at the threading position cannot exceed 12 tons. If it exceeds 12 tons, the mill must be stopped and the disc manually rotated. Operators manually control the rolling speed. Excessive rolling speed can lead to overloading, while insufficient rolling speed results in inefficient mill operation. Therefore, inaccurate speed control before the coiler disc rotates during production can cause frequent speed increases and decreases. The ideal rolling speed and the actual controlled speed of the mill are as follows... Figure 4 As shown, there is a significant deviation between the ideal speed and the actual speed. The speed changes frequently before the coiler reaches its final rotation position, and the rolling speed frequently changes to the low-speed range. This results in a larger relative amount of emulsion on the strip surface, leading to frequent emulsion residue defects.

[0024] In addition, such as Figure 5 As shown, during the rolling process, due to the thickness of the strip, there is a gap between the rolls and the edge of the strip. During the spraying of emulsion on the mill inlet side, it passes through this gap to the mill outlet side. The thicker the strip, the larger the gap; the thinner the strip, the smaller the gap. When producing certain specifications, the problem of emulsion residue at the edge of the strip is more serious.

[0025] Finally, existing methods for controlling emulsion residue are primarily applied to single-stand, multi-pass reversible rolling mills. These mills have short rolling intervals, low rolling speeds, and are equipped with wiping or squeezing devices, offering some potential for improvement in emulsion residue control. However, high-speed cold continuous rolling mills operate at speeds up to 1500 mpm and involve irreversible unidirectional rolling, resulting in fewer emulsion residue control solutions. Common approaches include reducing emulsion flow rate, increasing air purging pressure, and adding purging spray beams, but these methods are ineffective, easily leading to other chain reactions such as strip shape issues and increased energy consumption.

[0026] To address the aforementioned problems, this application provides a dynamic control method for the emulsion on the inlet side of the last stand in a cold rolling mill, effectively solving the problem of residual defects in the emulsion during the cold rolling mill production process and improving production line operating efficiency and quality. Please refer to [link / reference]. Figure 1 This is a flowchart illustrating a dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill, provided in an embodiment of this application. Specifically, it may include: S110. Obtain the current rolling parameters during the production process of the cold rolling mill, including the strip specifications and real-time rolling speed of the last stand of the cold rolling mill.

[0027] For example, in the process of producing strip steel on a cold rolling mill, it is necessary to first collect key current rolling parameters. These parameters mainly include the strip steel specifications and real-time rolling speed of the last stand of the cold rolling mill. Specific strip steel specifications include the strip width and thickness, which directly affect the distribution and demand of the emulsion on the strip surface. The real-time rolling speed reflects the speed at which the strip moves through the mill, affecting the amount of contact between the strip surface and the emulsion per unit time. For instance, when producing 6.0 / 2.5mm x 1800mm (raw material thickness / finished product thickness / raw material width) strip steel, it is necessary to accurately obtain the strip width of 1800mm, the finished product thickness of 2.5mm, and the real-time rolling speed, which may be different values ​​such as 203.8mpm. Only by accurately obtaining these parameters can a basis be provided for subsequently developing a reasonable emulsion control strategy, avoiding improper emulsion control due to inaccurate parameters, and thus reducing the occurrence of emulsion residue defects. If the parameters are obtained incorrectly, such as misjudging the strip width as 1700mm instead of 1800mm, it may cause deviations in the subsequent setting of emulsion pressure or flow rate, increasing the risk of emulsion residue.

[0028] S120. Based on the strip steel specifications and real-time rolling speed, determine the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold continuous rolling mill and the compensation quantity of the edge nozzles.

[0029] For example, based on the acquired strip specifications and real-time rolling speed, the dynamic control parameters of the emulsion at the inlet side of the last stand of the cold continuous rolling mill and the compensation quantity of the edge nozzles are determined. The dynamic control parameters include the pressure threshold of the roll gap lubrication zone and the flow threshold of the roll body cooling zone, etc.; the compensation quantity of the edge nozzles is determined according to the specific conditions of the strip, specifying the number of edge nozzles that need to be opened or closed.

[0030] Taking the production of 4.5 / 1.0mm×1170mm strip steel as an example, when the real-time rolling speed is ≤400mpm, combined with the strip width of 1170mm and the finished product thickness of 1.0mm, the reference pressure value of the roll gap lubrication zone (zone 14) is determined by matching from the preset pressure threshold table. After correction according to the speed range, the first pressure threshold is obtained as 0.4MPa. At the same time, the reference flow rate of the roll cooling zone (zone 15) is determined to be 200m³ / h from the preset flow rate threshold table. If the speed changes subsequently, flow rate compensation is required according to the speed range. Regarding the number of edge nozzles to be compensated, when the rolling speed is ≤300mpm, combined with the strip thickness of 1.0mm and the width of 1170mm, the target compensation value is determined to be -2, which means that 2 edge nozzles need to be closed.

[0031] By precisely matching the emulsion control parameters and the number of edge nozzles, the problem of mismatch between the emulsion and strip steel requirements caused by using fixed parameters in the past is avoided. Appropriate parameters and nozzle numbers can be set for different strip steel specifications and different rolling speeds, effectively reducing emulsion residue and improving strip steel surface quality.

[0032] S130. Based on dynamic control parameters, control the emulsion on the inlet side of the last stand of the cold rolling mill to perform the spraying action.

[0033] For example, based on predetermined dynamic control parameters, the emulsion on the inlet side of the last stand of the cold continuous rolling mill is controlled to perform the spraying action. For instance, when producing 6.0 / 2.5mm×1800mm strip steel with a rolling speed ≤400mpm, the emulsion spraying in the roll gap lubrication zone is controlled according to the predetermined emulsion pressure of 0.4MPa in zone 14, and the emulsion spraying in the roll cooling zone is controlled according to the flow rate of 270m³ / h in zone 15; when the rolling speed reaches 880-1000mpm, the flow rate in zone 15 is compensated by 3%, that is, the spraying is controlled according to 270×(1+3%)=278.1m³ / h.

[0034] By ensuring that the emulsion is sprayed according to the actual needs of strip steel production, the lubrication and cooling effects of the rolling mill process are guaranteed while avoiding excessive or insufficient emulsion. Too much emulsion increases the burden on air purging and easily leads to residue; too little emulsion fails to meet lubrication and cooling requirements, affecting normal mill operation and strip steel quality. Precise control of the spraying action balances lubrication and cooling needs with residue control.

[0035] S140. Based on the compensation quantity, control the opening and closing action of the emulsion edge nozzle on the inlet side of the last stand of the cold rolling mill.

[0036] For example, based on a determined number of edge nozzle compensations, the opening and closing actions of the emulsion edge nozzles at the inlet side of the last stand in a cold rolling mill are controlled. For instance, when producing 4.5 / 1.0mm × 1170mm strip steel with a rolling speed ≤ 300mpm, the compensation number is 2, meaning 2 edge nozzles are closed; when the rolling speed > 300mpm, the compensation number is 1, closing 1 edge nozzle. To address the issue of emulsion residue easily appearing at the edges of the strip steel, the excess emulsion at the strip steel edges is reduced by dynamically adjusting the number of opening and closing edge nozzles. Because of the gap between the rolls and the strip steel, emulsion can easily flow to the exit side through the gap. By closing some edge nozzles, the amount of emulsion sprayed at the edges is reduced, thereby effectively reducing the probability of edge emulsion residue defects and improving the overall surface quality of the strip steel.

[0037] In some examples, dynamic control parameters include a first pressure threshold for the roll gap lubrication zone and a first flow rate threshold for the roll body cooling zone; based on strip specifications and real-time rolling speed, dynamic control parameters for the inlet-side emulsion of the last stand in a cold rolling mill are determined, including: Based on the strip width and strip thickness in the strip specifications, the reference pressure value of the roll gap lubrication zone is determined by matching the first preset pressure threshold table. Based on the comparison between the real-time rolling speed and the first preset speed level, the reference pressure value is corrected to generate the first pressure threshold. Based on the strip width and strip thickness in the strip specifications, the reference flow rate value of the roller cooling zone is determined by matching the first preset flow rate threshold table. Based on the comparison between the real-time rolling speed and the second preset speed range, the reference flow rate value is calculated to generate the first flow rate threshold.

[0038] For example, when determining the first pressure threshold for the roll gap lubrication zone, a reference pressure value is first determined by matching the strip width and thickness in the strip specifications against a first preset pressure threshold table. For instance, for strips with a thickness ≥ 1.3 mm and a width B < 1150 mm, the corresponding reference pressure value can be found in the preset pressure threshold table. Next, the reference pressure value is corrected by referring to the comparison between the real-time rolling speed and the first preset speed setting (400 mpm). If the real-time rolling speed > 400 mpm, the reference pressure value may be appropriately increased; if the real-time rolling speed ≤ 400 mpm, the reference pressure value may be appropriately decreased, ultimately generating the first pressure threshold.

[0039] When determining the first flow threshold for the roll cooling zone, the baseline flow value is first determined by matching the strip width and thickness in the strip specifications with a first preset flow threshold table. Taking a strip with a thickness h > 0.73 mm and a width B ≥ 1901 mm as an example, the corresponding baseline flow value can be found to be 270 m³ / h from the preset flow threshold table. Then, flow compensation calculations are performed based on the comparison between the real-time rolling speed and the second preset speed range (880-1000 mpm and > 1000 mpm). When the real-time rolling speed is in the 880-1000 mpm range, the baseline flow value is compensated at a rate of 3%; when the speed is > 1000 mpm, it is compensated at a rate of 5%, thus generating the first flow threshold.

[0040] This method of determining dynamic control parameters allows for precise adjustment of the emulsion pressure and flow rate based on the actual specifications of the strip and the rolling speed, ensuring a high degree of match between the emulsion supply and the mill's process requirements. On one hand, it guarantees effective roll gap lubrication and roll cooling, ensuring stable mill operation and preventing equipment failures and strip quality issues caused by insufficient lubrication or cooling. On the other hand, it avoids emulsion waste, reduces energy costs, and minimizes the risk of residue from excessive emulsion, further improving the surface quality of the strip.

[0041] In some examples, based on the comparison between the real-time rolling speed and a second preset speed range, a flow compensation calculation is performed on the reference flow rate value to generate a first flow rate threshold, including: When the real-time rolling speed falls into the first speed range, the reference flow rate value is amplified and calculated based on the first preset compensation ratio to generate the first flow rate threshold. When the real-time rolling speed falls into the second speed range, the reference flow rate value is amplified and calculated based on the second preset compensation ratio to generate the first flow rate threshold. The lowest speed in the second speed range is greater than the highest speed in the first speed range, and the second preset compensation ratio is greater than the first preset compensation ratio.

[0042] For example, when the real-time rolling speed falls within the first speed range (880-1000mpm), the reference flow rate value is amplified based on the first preset compensation ratio (3%) to generate the first flow rate threshold. For instance, if the reference flow rate value is 270m³ / h, when the speed is between 880-1000mpm, the first flow rate threshold is 270×(1+3%)=278.1m³ / h.

[0043] When the real-time rolling speed falls into the second speed range (>1000mpm), the reference flow rate value is amplified based on the second preset compensation ratio (5%) to generate the first flow rate threshold. For example, with the same reference flow rate value of 270m³ / h, when the speed exceeds 1000mpm, the first flow rate threshold is 270×(1+5%)=283.5m³ / h. The lowest speed in the second speed range (1000mpm) is greater than the highest speed in the first speed range (1000mpm, which is the critical value of the range), and the second preset compensation ratio (5%) is greater than the first preset compensation ratio (3%).

[0044] This method of using different compensation ratios for different speed ranges meets the cooling requirements of the rolling mill at different speeds. The higher the speed, the more heat is generated by the work rolls, and the greater the need for cooling. By increasing the flow compensation ratio and the amount of emulsion injected, the heat generated by the work rolls can be better absorbed, ensuring that the work roll temperature remains stable within a reasonable range. This prevents work roll deformation due to excessive temperature, which would affect the strip shape and surface quality. At the same time, it avoids the waste of emulsion caused by over-compensation at low speeds, achieving a balance between cooling requirements and cost control.

[0045] In some examples, it also includes: Before the coiler of the cold rolling mill performs the coil changing operation, obtain the current coil weight parameters and strip steel specification parameters of the mandrel at the strip threading position of the coiler. Determine the target roll weight difference based on the current roll weight parameters and the equipment limit roll weight of the winding machine; Based on the target coil weight difference and strip steel specification parameters, determine the target rolling speed of the strip threading rolling stage of the cold continuous rolling mill; Based on the target rolling speed, the cold rolling mill is controlled to perform rolling actions.

[0046] For example, before the coiler of a cold rolling mill performs a coil change operation, it is necessary to obtain the current coil weight parameters and strip specification parameters of the mandrel at the strip threading position of the coiler. The current coil weight parameter reflects the weight of the strip already coiled on the mandrel at the strip threading position, while the strip specification parameters include key information such as the width and thickness of the strip.

[0047] Next, based on the current coil weight parameters and the coiler's maximum coil weight (12 tons), the target coil weight difference is determined, which is the difference between the equipment's maximum coil weight and the current coil weight parameters. This difference represents the maximum weight of strip steel that the mandrel at the threading position can continue to coil.

[0048] Then, based on the target coil weight difference and strip specifications, the target rolling speed for the strip threading stage of the cold continuous rolling mill is determined. This is because the strip specifications determine the weight per unit length of the strip. Combined with the target coil weight difference, the length of strip that needs to be rolled with the remaining coil weight can be calculated. Then, combined with the coiling duration, the appropriate rolling speed can be determined.

[0049] Finally, the cold rolling mill is controlled to perform rolling operations based on the target rolling speed. For example, when producing 6.0 / 2.5mm×1800mm strip steel, the target rolling speed at the strip threading position is calculated to be approximately 203.8mpm, and the mill rolls at this speed.

[0050] This application enables precise control of the rolling speed at the strip threading position before coil changing on the coiler, avoiding the problems of excessive speed leading to overweight coils or insufficient speed affecting mill efficiency that occurred when operators manually controlled the speed in the past. It ensures that the coil weight does not exceed the coiler's equipment limit, preventing equipment failure, while also maximizing mill efficiency and reducing emulsion residue defects caused by improper speed. Simultaneously, a stable rolling speed also helps ensure the quality of the strip steel, improving the overall production line's stability and efficiency.

[0051] In some examples, the target rolling speed for the strip threading stage of a cold continuous rolling mill is determined based on the target coil weight difference and strip specification parameters, including: Based on the raw material thickness, finished product thickness, and strip width in the strip specifications, determine the strip elongation coefficient and cross-sectional area; Based on the target roll weight difference, cross-sectional area, strip density, and preset winding duration, determine the basic speed value of the mandrel at the strip threading position; Based on the elongation coefficient and the preset compensation coefficient, the base speed value is corrected to generate the target rolling speed.

[0052] For example, firstly, based on the raw material thickness, finished product thickness, and strip width in the strip specifications, the elongation coefficient and cross-sectional area of ​​the strip are determined. The elongation coefficient E is equal to the ratio of the raw material thickness H to the finished product thickness h, i.e., E=H / h, which reflects the degree of deformation of the strip during the rolling process; the cross-sectional area is calculated using the strip width B and the finished product thickness h, i.e., cross-sectional area = B×h, which determines the weight per unit length of the strip.

[0053] Then, based on the target roll weight difference, cross-sectional area, strip density (7.85 g / cm³), and preset winding duration (1.5 min), the basic speed value of the mandrel at the strip threading position is determined. The calculation logic is as follows: first, the volume of strip that can still be wound is calculated based on the target roll weight difference and strip density; then, the length of the strip is obtained by combining the cross-sectional area; finally, the basic speed value is obtained by dividing the strip length by the preset winding duration.

[0054] Finally, based on the elongation coefficient and the preset compensation coefficient (0.9–0.95), the base speed value is corrected to generate the target rolling speed. The compensation coefficient is introduced to account for various error factors in actual production, ensuring that the target rolling speed is more accurate and reliable. For example, when producing 4.5 / 1.0mm × 1170mm strip steel, the above calculation steps yield an elongation coefficient E = 4.5 / 1 = 4.5. The cross-sectional area is calculated based on a width of 1170mm (equivalent to 117cm) and a finished product thickness of 1.0mm (equivalent to 0.1cm). Combining the target coil weight difference, strip density, and coiling duration, the base speed value is calculated. Finally, after correction using the elongation coefficient and compensation coefficient, the target rolling speed is approximately 783.9mpm.

[0055] This method of precisely calculating the target rolling speed ensures that the mill operates at the optimal speed during the strip threading stage before coil changing. This not only guarantees that the coil weight does not exceed equipment limits, preventing equipment damage and production interruptions, but also maximizes the mill's production efficiency and reduces rolling time. Simultaneously, a stable rolling speed reduces emulsion residue issues caused by frequent speed changes, improving the surface quality of the strip and production stability, laying a solid foundation for subsequent rolling processes.

[0056] In some examples, the compensation quantity of the edge nozzles of the emulsion on the inlet side of the last stand of a cold rolling mill is determined based on strip specifications and real-time rolling speed, including: Based on the strip thickness and strip width in the strip specifications, the reference compensation value of the edge nozzle is determined by matching the first preset compensation parameter table. Based on the comparison between the real-time rolling speed and the third preset speed level, the benchmark compensation value is corrected to generate the target compensation value. Based on the target compensation value, determine the number of edge nozzles that need to be closed, as the compensation quantity.

[0057] For example, firstly, based on the strip thickness and strip width in the strip specifications, a first preset compensation parameter table is matched to determine the baseline compensation value of the edge nozzle. The preset compensation parameter table sets corresponding baseline compensation values ​​for different strip thickness ranges (e.g., thickness > 1mm and thickness ≤ 1mm) and strip width ranges (e.g., 1500mm > B > 1200mm, B ≥ 1500mm, B ≤ 1200mm). For instance, for a strip with a thickness > 1mm and a width of 1500mm > B > 1200mm, the baseline compensation value can be found to be 1 in the preset compensation parameter table.

[0058] Next, based on the comparison between the real-time rolling speed and the third preset speed setting (300mpm), the baseline compensation value is corrected to generate the target compensation value. If the real-time rolling speed is >300mpm, the baseline compensation value may remain unchanged; if the real-time rolling speed is ≤300mpm, the baseline compensation value may be adjusted, for example, by reducing it. For example, for strip steel with a thickness >1mm and a width of 1500mm > B > 1200mm, when the real-time rolling speed is ≤300mpm, the baseline compensation value of 1 may be corrected to 0, resulting in a target compensation value of 0.

[0059] Finally, the number of edge nozzles that need to be closed is determined based on the target compensation value, and this number serves as the compensation quantity. If the target compensation value is positive, it may be necessary to open a corresponding number of edge nozzles; if the target compensation value is zero or negative, the number of nozzles to be closed is determined according to the corresponding rules.

[0060] By dynamically adjusting the number of edge nozzles, the amount of emulsion sprayed at the edges can be precisely controlled based on the strip thickness, width, and real-time rolling speed. The strip edges are a high-risk area for emulsion residue. By rationally determining the compensation number of edge nozzles, excess emulsion at the edges is reduced, effectively lowering the probability of edge emulsion residue defects. Simultaneously, it avoids the problem of emulsion waste or insufficiency caused by a fixed number of edge nozzles. While ensuring the normal operation of the rolling mill, this improves the surface quality of the strip and reduces production costs.

[0061] In some examples, the number of side nozzles that need to be closed is determined based on the target compensation value as the compensation quantity, including: when the target compensation value is zero, the compensation quantity is determined to be zero, and the current side nozzles are kept open; when the target compensation value is negative, the absolute value of the target compensation value is determined as the number of side nozzles that need to be closed as the compensation quantity.

[0062] For example, when the target compensation value is zero, the compensation quantity is set to zero, and the current opening state of the edge nozzles is maintained. This means that under the current conditions of strip thickness, width, and rolling speed, the existing number of edge nozzles open is sufficient to meet production needs. There is no need to additionally open or close the edge nozzles to ensure normal emulsion spraying and meet the mill's process requirements, while avoiding emulsion residue or insufficient supply problems caused by improper nozzle quantity adjustment. For instance, when producing certain strip specifications, and the real-time rolling speed, strip thickness, and width are all within an ideal range, the target compensation value is zero. In this case, maintaining the existing number of edge nozzles open ensures lubrication and cooling without causing emulsion residue.

[0063] When the target compensation value is negative, the absolute value of the target compensation value is determined as the number of edge nozzles that need to be closed, serving as the compensation quantity. This is because a negative target compensation value indicates that too many edge nozzles are currently open, requiring the closure of a corresponding number of nozzles to reduce the amount of edge emulsion sprayed. For example, when the target compensation value is -2, two edge nozzles need to be closed. By closing excess edge nozzles, the supply of emulsion to the strip edge can be effectively reduced, preventing emulsion from flowing to the exit side through the gap between the roll and the strip edge, thereby reducing the risk of edge emulsion residue defects. This clear rule for determining the compensation quantity makes the control of edge nozzles more precise and standardized, avoiding errors caused by human judgment. Under different production conditions, the number of edge nozzles opened and closed can be determined according to a unified rule, ensuring the rationality of the edge emulsion spray volume. This not only effectively reduces edge emulsion residue and improves the surface quality of the strip, but also avoids emulsion waste, reduces production energy consumption and costs, and provides a strong guarantee for the stable and efficient operation of the cold rolling mill.

[0064] This application proposes a dynamic control method for the emulsion on the inlet side of the last stand in a cold continuous rolling mill. Different control modes are adopted according to the different functions of zones 14 and 15 of the emulsion: zone 14 uses a pressure control mode, and zone 15 uses a flow control mode. The concept of emulsion control thresholds is introduced, and different control thresholds are applied based on the strip width, thickness, and rolling speed to achieve dynamic emulsion control. Zone 14 is the lubrication zone of the 5-stand roll gap. Originally, it used a fixed pressure control mode, but different pressure control values ​​are set according to the strip thickness, width, and rolling speed. For narrow and thick specifications that are prone to residual defects, the emulsion pressure value is appropriately reduced; for wide and thin specifications that are less prone to residual defects, the emulsion pressure setting value is increased. The rolling speed is set as high and low speed increments, graded in 400mpm increments. Different pressure control thresholds are applied at different rolling speeds depending on the strip width to achieve precise pressure control in zone 14. Specific pressure control threshold settings are shown in Table 1 below.

[0065]

[0066] Table 1 Zone 15 is used for cooling the work rolls of the 5-stand mill. A flow control mode ensures effective lubrication and cooling of the emulsion process. Emulsion flow thresholds are set according to different widths and thicknesses, and a high-speed flow enhancement compensation function is added: 3% flow compensation for speeds of 880-1000 MPa, and 5% flow compensation for speeds >1000 MPa. This improves the lubrication and cooling effect of the emulsion process. Specific parameters are shown in Table 2 below.

[0067]

[0068] Table 2 A free speed-up function for the rolling mill was developed to reduce the problem of frequent speed increases and decreases caused by operator intervention before the coiler disc reaches its final position. Limiting the equipment's capacity to a maximum weight of 12 tons, the maximum rolling speed of the mandrel at the coiler's threading position was calculated based on the strip width, thickness, and density. This ensures that the weight limit is not exceeded while maximizing mill efficiency. The maximum speed before the disc reaches its final position (threading position) is as follows.

[0069] Vh 穿带位 =(12* C ) / (B*H*ρ*T)*E; E=H / h; Vh represents the highest speed at the threading position, a calculated variable, in m / s; B is the strip width, in cm; H is the raw strip thickness, in cm; h is the finished strip thickness, in cm; E is the strip elongation coefficient; ρ is the strip density, taken as 7.85 g / cm³. 3 C is the compensation coefficient, with a value of 0.9 to 0.95; T is the time from when the strip is sheared until it rotates into position on the outer support of the coiler, which is 1.5 minutes.

[0070] Through functional development, the mill speed is now automatically controlled. This avoids frequent intervention by the operator in controlling the rolling speed and prevents residual defects caused by inadequate speed control or excessively low speed.

[0071] An automatic compensation system for emulsion edge nozzles on the S5 mill stand was developed. During the rolling process, due to the thickness of the strip, there is a gap between the rolls and the strip edge. During the emulsion spraying process at the S5 mill inlet, some emulsion will pass through this gap to the mill exit side. The thicker the strip, the larger the gap; the thinner the strip, the smaller the gap. In the production of certain thick and narrow specifications, the problem of emulsion residue at the strip edge is more serious. In previous production conditions, the relationship between the number of emulsion nozzles opened and the strip thickness was as follows: Figure 6As shown, the emulsion nozzle spray range completely covers both sides of the strip and has a certain redundancy. The number of nozzles on and off does not change with the rolling speed or strip thickness during the rolling process. A 5-stand emulsion edge nozzle automatic compensation system was developed. When the strip width, strip thickness, and rolling speed change, the number of strip edge nozzles on and off changes accordingly. The number of strip edge nozzles opened is controlled according to the production conditions to avoid emulsion residue problems.

[0072] The edge nozzle compensation is differentiated according to strip thickness, rolling speed, and strip width. The specific compensation parameters are shown in Table 3 below.

[0073]

[0074] Table 3 The technical solution of this application will be further described in detail below through specific embodiments.

[0075] This application provides a dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill, to solve the problem of residual defects in the emulsion during the cold rolling mill production process, and to improve the production line's operating efficiency and quality level. Figure 7 As shown, Figure 7 The main body 1 of the cold rolling mill (which includes stands S1-S5) and the coiler 2 are provided in the embodiments of this application. The cold rolling mill includes a first stand S1, a second stand S2, a third stand S3, a fourth stand S4 and a fifth stand S5.

[0076] This application implements zoned control of the emulsion in the S5 stand. Zone 14 is the lubrication zone for the roll gap of the 5-stand mill, employing a dynamic pressure control mode, divided into 12 pressure control threshold zones, with adjustable settings for each zone. Zone 15 is the cooling zone for the work rolls of the 5-stand mill, divided into 16 flow control threshold zones, with adjustable settings for each zone. A high-speed flow enhancement compensation function is added: a 3% compensation for the flow control threshold at rolling speeds of 880-1000 MPa, and a 5% compensation for speeds >1000 MPa. During production, the emulsion dynamic control system presets the flow and pressure thresholds based on the strip width, thickness, and rolling speed.

[0077] A free-speed-up function for rolling mills was developed to solve the problem of frequent speed increases and decreases caused by operator intervention before the outer support of the coiler's main rotating disc is in place. The rolling speed is automatically controlled based on the optimal speed calculated by the free-speed-up function.

[0078] An automatic compensation system for the edge nozzles of emulsion on the S5 stand was developed, which is divided into 12 compensation control zones. Based on the strip width, thickness and rolling speed, the automatic compensation system for the edge nozzles presets the number of edge nozzles to be switched on and off, so as to realize dynamic compensation of the edge nozzles. The general trend is that the thicker the strip and the lower the rolling speed, the more edge nozzles are closed, thereby reducing the amount of emulsion and avoiding emulsion residue defects.

[0079] Example 1 Taking a 6.0 / 2.5mm*1800mm (raw material thickness / finished product thickness * raw material width) strip steel as an example, the specific implementation details are as follows: After the weld seam is sheared, the strip is wound up by a mandrel at the strip threading position. The system calculates the optimal speed, Vh, based on the strip specifications. 穿带位 = (12t*0.9*106) / (180*0.6*7.85*1.5*102)*(6 / 2.5)≈203.8m / min. Therefore, when the strip is rolled at the threading position, the rolling mill rolls at a speed of 203.8mpm. At this speed, it can ensure that the weight is not exceeded and the rolling mill efficiency is fully utilized. After the coiler rotates to the outer support of the coiling position, the rolling mill rolls at the maximum speed set by the system.

[0080] During the rolling process, when the rolling speed is ≤400mpm, the emulsion pressure in zone 14 is 0.3MPa according to the threshold settings of the emulsion dynamic control system; when the rolling speed is >400mpm, the emulsion pressure in zone 14 is 0.4MPa. The flow rate in zone 15 is 270m³ / h; when the rolling speed reaches 880-1000mpm, the flow rate in zone 15 is 278.1m³ / h.

[0081] During the rolling process, according to the preset value of the emulsion edge nozzle automatic compensation system, when the rolling speed is ≤300mpm, the compensation of the emulsion edge nozzle of the 5th stand is “0”; when the rolling speed is >300mpm, the compensation of the emulsion edge nozzle of the 5th stand is “1”.

[0082] Example 2 Taking a 4.5 / 1.0mm*1170mm (raw material thickness / finished product thickness * raw material width) strip steel as an example, the specific implementation details are as follows: After the weld seam is sheared, the strip is coiled at the mandrel in the threading position. The system calculates the optimal speed based on the strip specifications: Vh threading position = (12t*0.9*106) / (117*0.45*7.85*1.5*102)*(4.5 / 1) ≈ 783.9 m / min. Therefore, when rolling the strip at the threading position, the mill operates at a speed of 783.9 m / min. At this speed, both overloading and full mill efficiency are ensured. Once the coiler rotates to the outer support at the coiling position, the mill operates at the maximum speed set by the system.

[0083] During the rolling process, when the rolling speed is ≤400mpm, the emulsion pressure in zone 14 is 0.4MPa according to the threshold settings of the emulsion dynamic control system; when the rolling speed is >400mpm, the emulsion pressure in zone 14 is 0.41MPa. The flow rate in zone 15 is 200m³ / h; when the rolling speed reaches 880-1000mpm, the flow rate in zone 15 is 206m³ / h; and when the rolling speed is >1000mpm, the flow rate in zone 15 is 210m³ / h.

[0084] During the rolling process, according to the preset value of the emulsion edge nozzle automatic compensation system, when the rolling speed is ≤300mpm, the compensation of the 5-stand emulsion edge nozzle is "-2"; when the rolling speed is >300mpm, the compensation of the 5-stand emulsion edge nozzle is "-1".

[0085] This application includes dynamic zone control of emulsion in the S5 rolling mill, free speed-up function of the rolling mill, and automatic compensation system for emulsion edge nozzles, forming a method for eliminating residual defects in emulsion based on cold continuous rolling mills. This method, without changing the equipment structure or increasing energy consumption, achieves intelligent and dynamic control of the emulsion, rolling speed, and edge nozzles through the development of a series of functions. It solves the problem of residual defects in emulsion during endless rolling in cold continuous rolling mills, improving the quality level and production efficiency of the production line.

[0086] It should be noted that the above embodiments are merely best examples and are not intended to limit the implementation of this application.

[0087] Furthermore, this application also proposes a dynamic control system for the emulsion on the inlet side of the last stand of a cold rolling mill, applied to an embodiment of any of the above-mentioned dynamic control methods for the emulsion on the inlet side of the last stand of a cold rolling mill, specifically as follows: Figure 8 The diagram shown is a functional module schematic of a dynamic control system for the emulsion on the inlet side of the last stand of a cold rolling mill, as proposed in this application, including: The data acquisition module 10 is used to acquire the current rolling parameters during the production process of the cold rolling mill, including the strip specifications and real-time rolling speed of the last stand of the cold rolling mill. The data calculation module 20 is used to determine the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold rolling mill and the number of compensation nozzles based on the strip steel specification parameters and real-time rolling speed. The first action module 30 is used to control the emulsion on the inlet side of the last stand of the cold rolling mill to perform a spraying action based on dynamic control parameters. The second action module 40 is used to control the inlet-side emulsion edge nozzle of the last stand of the cold rolling mill to perform switching actions based on the compensation quantity.

[0088] like Figure 9 As shown, this application embodiment also provides an electronic device 300, including a processor 310, a memory 320, and a computer program 321 stored in the memory 320 and executable on the processor. When the processor 310 executes the computer program 321, it implements the steps of the dynamic control method for the emulsion on the inlet side of the last stand of any of the above-mentioned cold rolling mills.

[0089] Since the electronic device described in this embodiment is the device used to implement the dynamic control method of the emulsion on the inlet side of the last stand of a cold rolling mill in this application embodiment, those skilled in the art can understand the specific implementation method and its various variations of the electronic device in this embodiment based on the method described in this application embodiment. Therefore, how the electronic device implements the method in this application embodiment will not be described in detail here. Any device used by those skilled in the art to implement the method in this application embodiment is within the scope of protection of this application.

[0090] In practical implementation, when the computer program 321 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0091] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0093] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0094] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to execute a process for a dynamic control method of the emulsion on the inlet side of the last stand of a cold rolling mill.

[0097] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only 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 coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0100] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0101] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0102] 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 this application, 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 this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0104] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0105] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for dynamic control of emulsion on the inlet side of the last stand of a cold rolling mill, characterized in that, include: Obtain the current rolling parameters during the production process of the cold rolling mill, wherein the current rolling parameters include the strip specifications and real-time rolling speed of the last stand of the cold rolling mill; Based on the strip steel specifications and the real-time rolling speed, the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold continuous rolling mill and the compensation quantity of the edge nozzles are determined. Based on the aforementioned dynamic control parameters, the emulsion on the inlet side of the last stand of the cold rolling mill is controlled to perform a spraying action. Based on the compensation amount, the inlet-side emulsion edge nozzle of the last stand of the cold rolling mill is controlled to perform a switching action.

2. The dynamic control method for the emulsion on the inlet side of the last stand of a cold continuous rolling mill according to claim 1, characterized in that, The dynamic control parameters include the first pressure threshold of the roll gap lubrication zone and the first flow threshold of the roll body cooling zone. Based on the strip steel specifications and the real-time rolling speed, the dynamic control parameters of the inlet-side emulsion of the last stand of the cold continuous rolling mill are determined, including: Based on the strip width and strip thickness in the strip specifications, a first preset pressure threshold table is matched to determine the reference pressure value of the roll gap lubrication zone; Based on the comparison result between the real-time rolling speed and the first preset speed level, the reference pressure value is corrected to generate the first pressure threshold. Based on the strip width and strip thickness in the strip specifications, a first preset flow threshold table is matched to determine the reference flow value of the roller cooling zone; Based on the comparison result between the real-time rolling speed and the second preset speed range, the reference flow rate value is calculated to generate the first flow rate threshold.

3. The dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill according to claim 2, characterized in that, The step of performing flow compensation calculation on the reference flow rate value based on the comparison result between the real-time rolling speed and the second preset speed range to generate the first flow rate threshold includes: When the real-time rolling speed falls into the first speed range, the reference flow rate value is amplified and calculated based on the first preset compensation ratio to generate the first flow rate threshold. When the real-time rolling speed falls into the second speed range, the reference flow rate value is amplified based on the second preset compensation ratio to generate the first flow rate threshold. The lowest speed in the second speed range is greater than the highest speed in the first speed range, and the second preset compensation ratio is greater than the first preset compensation ratio.

4. The dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill according to claim 1, characterized in that, Also includes: Before the coiler of the cold rolling mill performs the coil changing operation, the current coil weight parameters and the strip specification parameters of the mandrel at the strip threading position of the coiler are obtained. Based on the current roll weight parameters and the equipment limit roll weight of the winding machine, the target roll weight difference is determined; Based on the target coil weight difference and the strip steel specification parameters, the target rolling speed of the strip threading rolling stage of the cold continuous rolling mill is determined; Based on the target rolling speed, the cold continuous rolling mill is controlled to perform rolling operations.

5. The dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill according to claim 4, characterized in that, The determination of the target rolling speed for the strip threading stage of the cold continuous rolling mill based on the target coil weight difference and the strip specification parameters includes: Based on the raw material thickness, finished product thickness, and strip width in the strip specifications, the elongation coefficient and cross-sectional area of ​​the strip are determined. Based on the target coil weight difference, the cross-sectional area, the strip density, and the preset coiling duration, the base speed value of the mandrel at the threading position is determined; Based on the elongation coefficient and the preset compensation coefficient, the base speed value is corrected to generate the target rolling speed.

6. The method for dynamic control of the emulsion on the inlet side of the last stand of a cold rolling mill according to claim 1, characterized in that, Based on the strip steel specifications and the real-time rolling speed, the compensation quantity of the edge nozzles of the emulsion on the inlet side of the last stand of the cold continuous rolling mill is determined, including: Based on the strip thickness and strip width in the strip specifications, the reference compensation value of the edge nozzle is determined by matching the first preset compensation parameter table. Based on the comparison result between the real-time rolling speed and the third preset speed level, the benchmark compensation value is corrected to generate the target compensation value. Based on the target compensation value, the number of side nozzles that need to be closed is determined as the compensation quantity.

7. The dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill according to claim 6, characterized in that, The step of determining the number of side nozzles that need to be closed based on the target compensation value, as the compensation quantity, includes: When the target compensation value is zero, the compensation quantity is determined to be zero, and the current side nozzle opening state is maintained; When the target compensation value is negative, the absolute value of the target compensation value is determined as the number of side nozzles that need to be closed, and this number is used as the compensation quantity.

8. A dynamic control system for the emulsion on the inlet side of the last stand of a cold rolling mill, applied to the dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill according to any one of claims 1 to 7, characterized in that, include: The data acquisition module is used to acquire the current rolling parameters during the production process of the cold rolling mill, wherein the current rolling parameters include the strip specifications and real-time rolling speed of the last stand of the cold rolling mill; The data calculation module is used to determine the dynamic control parameters of the emulsion on the inlet side of the last stand of the cold rolling mill and the compensation quantity of the edge nozzles based on the strip steel specification parameters and the real-time rolling speed. The first action module is used to control the emulsion on the inlet side of the last stand of the cold rolling mill to perform a spraying action based on the dynamic control parameters. The second action module is used to control the inlet-side emulsion edge nozzle of the last stand of the cold rolling mill to perform a switching action based on the compensation quantity.

9. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of the dynamic control method for the emulsion on the inlet side of the last stand of a cold rolling mill as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the dynamic control method for the emulsion on the inlet side of the last stand of the cold rolling mill as described in any one of claims 1 to 7.

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