Initial valve dislocation control method and system

Abstract

The invention provides an initial valve dislocation control method and system, and the method comprises the steps: obtaining the strip steel control thickness during the secondary setting of finish rolling and the rolling speed of a finish rolling F7 rack when strip steel reaches a finish rolling inlet pyrometer; and when the strip steel control thickness and the rolling speed meet preset judgment conditions, according to different control thickness ranges in which the strip steel control thickness falls, a layer cooling upper starting valve and a layer cooling lower starting valve are controlled to execute different dislocation control strategies, so that the strip steel stably runs on a layer cooling roller way. By optimizing the opening positions of the layer cooling upper and lower starting valves and controlling the positions of the layer cooling upper and lower starting valves in a staggered manner, the stable operation of the high-strength ultra-thin strip steel on the layer cooling roller way is realized.

Description

Technical Field

[0001] This invention relates to the field of steel production application technology, and in particular to a method and system for controlling the misalignment of an initial valve. Background Technology

[0002] When rolling ultra-thin high-strength steel on a hot-rolled coil production line in a steel mill, issues such as thin strip thickness, high rolling speed, light unit weight, unstable cooling water pressure and flow rate in the laminar flow cooling valves, and unreasonable speed settings between the finishing mill F7 stand and the laminar flow cooling roller table often cause the strip to drift away from the roller table after finishing on the finishing mill F7 stand and entering the laminar flow cooling area. This means the strip does not run on the roller table, but floats in the air or forms a large gap with the laminar flow cooling roller table. Only after the strip head enters the coil and establishes stable tension can it be pressed onto the roller table normally. When thin strip drifts away from the laminar flow cooling roller table, various problems occur, such as the strip head deviating and hitting the laminar flow cooling roller table guard plate, the strip head tilting upwards and hitting the coiling pinch rolls, the strip head tilting upwards and hitting the laminar flow cooling outlet air blower, causing equipment damage, and the strip head folding after entering the coil, resulting in abnormal coil shape. These issues seriously affect the production line's stability and equipment safety. Summary of the Invention

[0003] This invention provides a method and system for controlling the misalignment of the starting valve to solve the problems of thin strip head drifting off the cold roller conveyor and stacking steel or strip head tilting upwards and damaging the cold roller outlet equipment, which affect production stability and equipment safety.

[0004] The present invention provides a method for controlling the misalignment of an initial valve, comprising: When the strip reaches the high temperature gauge at the entrance of the finishing mill, the strip control thickness and the rolling speed of the finishing mill F7 stand are obtained during the secondary setting of the finishing mill. When the strip control thickness and the rolling speed meet the preset discrimination conditions, the upper and lower start valves of the layer cooling system are controlled to execute different staggered control strategies according to the different control thickness ranges into which the strip control thickness falls, so that the strip runs stably on the layer cooling roller table.

[0005] In one embodiment of the present invention, the preset discrimination conditions include: controlling the thickness to be less than or equal to 2.5 mm and the rolling speed of the F7 stand to be greater than or equal to 9.5 m / s.

[0006] In one embodiment of the present invention, when the strip thickness is less than or equal to 2.5 mm and greater than 2.2 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a first number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

[0007] In one embodiment of the present invention, when the strip thickness is less than or equal to 2.2 mm and greater than 1.8 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a second number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

[0008] In one embodiment of the present invention, when the controlled thickness of the strip is less than or equal to 1.8 mm and greater than 1.5 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a third number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

[0009] In one embodiment of the present invention, when the strip thickness is less than or equal to 1.5 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a fourth number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

[0010] In one embodiment of the present invention, the first quantity, the second quantity, the third quantity, and the fourth quantity increase sequentially.

[0011] The present invention also provides a starting valve misalignment control system, comprising: a data acquisition module, used to acquire the strip control thickness and the rolling speed of the finishing mill F7 stand when the strip reaches the finishing mill inlet pyrometer; and a valve control module, used to control the upper and lower starting valves of the laminar cooling mill to execute different misalignment control strategies according to the different control thickness ranges into which the strip control thickness falls when the strip control thickness and the rolling speed meet preset discrimination conditions, so that the strip runs stably on the laminar cooling roller table.

[0012] The beneficial effects of this invention are as follows: The starting valve misalignment control method and system proposed in this invention adopts a method of misaligned opening of the upper and lower starting valves for ultra-thin strip steel of high strength steel. Different starting valve misalignment control strategies are adopted for strip steel of different thicknesses. This can effectively avoid the occurrence of rolling stop accidents caused by the head of thin strip steel drifting off the cooling roller table, thus ensuring production stability and equipment safety. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0014] In the attached diagram: Figure 1 This is a flowchart illustrating the starting valve misalignment control method in one embodiment of the present invention; Figure 2 This is a block diagram of a starting valve misalignment control system according to an embodiment of the present invention. Detailed Implementation

[0015] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0016] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0017] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0018] To address the issue of thin-gauge high-strength steel strip deviating from the cold-roller conveyor in hot-rolled coil production lines, the lead rate of the cold-roller conveyor was adjusted to make its running speed greater than the strip speed. However, the actual control effect was not significant, and thin-gauge strip still frequently and severely deviated from the cold-roller conveyor, affecting production stability. The main problems with the existing control technology are as follows: 1. There is no effective solution to the problem of the cold roller table for ultra-thin high-strength steel rolling. Adjusting the lead rate of the cold roller table has little effect. 2. When high-strength steel of extremely thin specifications is removed from the cold roller conveyor, there is a significant risk of steel accumulation and damage to the cold roller outlet equipment. In addition, the head folding and steel accumulation process takes a long time, which affects the production line efficiency and product quality.

[0019] Based on the problems existing in the prior art, the present invention provides a method and system for controlling the misalignment of an initial valve. The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0020] Please see Figure 1 , Figure 1 This is a flowchart illustrating a starting valve misalignment control method according to an embodiment of the present invention. The method includes the following steps: Step S100: When the strip reaches the high temperature gauge at the entrance of the finishing mill, obtain the strip control thickness and the rolling speed of the finishing mill F7 stand during the secondary setting of the finishing mill.

[0021] In one embodiment, the laminar cooling zone valves are divided into: a rapid cooling section (3 tilting frames), each tilting frame having 4 sets of valves (upper and lower); a coarse adjustment section (12 tilting frames), each tilting frame having 4 sets of valves (upper and lower); a rapid cooling second section (2 tilting frames), each tilting frame having 8 sets of valves (upper and lower); and a fine adjustment section (3 tilting frames), each tilting frame having 8 sets of valves (upper and lower). Conventionally, the laminar cooling valves for strip steel open and close simultaneously. However, for extremely thin high-strength steel specifications, the laminar cooling initiation valves open asymmetrically. The number of misaligned control groups for the upper and lower initiation valves is determined by controlling the thickness. Therefore, the activation of the initiation valve misalignment control can be determined based on the controlled thickness of the strip steel. When the strip steel reaches the high-temperature gauge at the finishing mill inlet, the high-temperature gauge detects a steel signal, allowing the acquisition of the strip steel controlled thickness and the F7 stand rolling speed during the second setting of the finishing mill. When the strip steel controlled thickness is ≤2.5mm and the F7 stand rolling speed is ≥9.5m / s, the laminar cooling upper and lower initiation valve misalignment control method is automatically activated.

[0022] Step S110: When the strip control thickness and the rolling speed meet the preset discrimination conditions, the upper and lower start valves of the layer cooling system are controlled to execute different misalignment control strategies according to the different control thickness ranges into which the strip control thickness falls, so that the strip runs stably on the layer cooling roller table.

[0023] In one embodiment, when the controlled thickness of the strip is less than or equal to 2.5 mm and greater than 2.2 mm, after the opening position of the upper starting valve of the laminar cooling is determined, the opening position of the lower starting valve of the laminar cooling is shifted backward by a first number of valve groups relative to the opening position of the upper starting valve of the laminar cooling. Specifically, taking the first number as 10 as an example, when 2.2 < controlled thickness ≤ 2.5 mm, after the opening position of the upper starting valve of the laminar cooling is determined, the opening position of the lower starting valve is automatically shifted backward by 10 groups. For example, when the upper starting valve is the valve in the first group of the second tilting frame of the rapid cooling section (valve 5), the lower starting valve is automatically shifted backward by 10 groups. When the lower starting valve is the valve in the third group of the first tilting frame of the coarse adjustment section (valve 15), the automatic misalignment control of the upper and lower starting valves of the laminar cooling is realized.

[0024] In one embodiment, when the controlled thickness of the strip is less than or equal to 2.2 mm and greater than 1.8 mm, after the opening position of the upper starting valve in the laminar cooling process is determined, the opening position of the lower starting valve in the laminar cooling process is shifted backward by a second number of valve groups relative to the opening position of the upper starting valve. Specifically, taking 12 as an example, when 1.8 < controlled thickness ≤ 2.2 mm, after the opening position of the upper starting valve in the laminar cooling process is determined, the opening position of the lower starting valve is automatically shifted backward by 12 groups. For example, when the upper starting valve is the valve in the first group of the second tilting frame in the rapid cooling section, the lower starting valve is automatically shifted backward by 12 groups. The lower starting valve is the valve in the first group of the second tilting frame in the coarse adjustment section (valve 17), thus realizing automatic misalignment control of the upper and lower starting valves in the laminar cooling process.

[0025] In one embodiment, when the controlled thickness of the strip is less than or equal to 1.8 mm and greater than 1.5 mm, after the opening position of the upper starting valve of the laminar cooling is determined, the opening position of the lower starting valve of the laminar cooling is shifted backward by a third number of valve groups relative to the opening position of the upper starting valve of the laminar cooling. Specifically, taking the third number as 14 as an example, when 1.5 < controlled thickness ≤ 1.8 mm, after the opening position of the upper starting valve of the laminar cooling is determined, the opening position of the lower starting valve is automatically shifted backward by 14 groups. For example, when the upper starting valve is the valve of the first group of the second tilting frame in the rapid cooling section, the lower starting valve is automatically shifted backward by 14 groups. The lower starting valve is the valve of the third group of the second tilting frame in the coarse adjustment section (valve 19), realizing automatic misalignment control of the upper and lower starting valves of the laminar cooling.

[0026] In one embodiment, when the strip thickness is less than or equal to 1.5 mm, after the opening position of the upper starting valve in the laminar cooling process is determined, the opening position of the lower starting valve in the laminar cooling process is shifted backward by a fourth number of valve groups relative to the opening position of the upper starting valve. Specifically, taking 16 as an example, when the control thickness is ≤1.5 mm, after the opening position of the upper starting valve in the laminar cooling process is determined, the opening position of the lower starting valve automatically shifts backward by 16 groups. For example, if the upper starting valve is the valve in the first group of the second tilting frame in the rapid cooling section, the lower starting valve automatically shifts backward by 16 groups. The lower starting valve is the valve in the first group of the third tilting frame in the coarse adjustment section (valve 21), thus realizing automatic misalignment control of the upper and lower starting valves in the laminar cooling process.

[0027] In one embodiment, the first quantity, the second quantity, the third quantity, and the fourth quantity increase sequentially, and are not limited to the values ​​in the aforementioned embodiments. The specific values ​​can be adjusted according to actual production needs.

[0028] This invention utilizes the staggered control of the upper and lower starting valves in the layer cooling process. When rolling extremely thin high-strength steel, the upper valve of the layer cooling system opens first, pressing down the strip that has drifted off the layer cooling roller table using the flow and pressure of the cooling water. This ensures that after the strip head starts drifting off the roller table, it is pressed down by the cooling water flow and pressure of the upper valve, allowing the strip head to run stably on the layer cooling roller table. This effectively prevents the strip head from deviating, piling up, or damaging on-site facilities and equipment, thus improving production stability. It also solves the problem of existing control technologies lacking effective solutions for the drifting of extremely thin strip from the layer cooling roller table, frequently resulting in the strip head drifting off the roller table and colliding with the roller table guard plate. Furthermore, it solves the problem of extremely thin strip drifting off the roller table and being blown out by the layer cooling outlet, causing equipment damage and affecting safe operation. Finally, it solves the problem of extremely thin strip drifting off the roller table frequently causing the coil to bite and fold, affecting the coil shape quality.

[0029] Please see Figure 2 , Figure 2 This is a block diagram of the starting valve misalignment control system in one embodiment of the present invention. The system includes: a data acquisition module 20, used to acquire the strip control thickness and the rolling speed of the finishing mill F7 stand when the strip reaches the high temperature gauge at the finishing mill inlet; and a valve control module 21, used to control the upper and lower starting valves of the laminar flow to execute different misalignment control strategies according to the different control thickness ranges into which the strip control thickness falls when the strip control thickness and the rolling speed meet preset discrimination conditions, so that the strip runs stably on the laminar flow roller table.

[0030] The specific process of misalignment control has been described in detail in the aforementioned method embodiments, and will not be repeated here.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling the misalignment of an initial valve, characterized in that, include: When the strip reaches the high temperature gauge at the entrance of the finishing mill, the strip control thickness and the rolling speed of the finishing mill F7 stand are obtained during the secondary setting of the finishing mill. When the strip control thickness and the rolling speed meet the preset discrimination conditions, the upper and lower start valves of the layer cooling system are controlled to execute different staggered control strategies according to the different control thickness ranges into which the strip control thickness falls, so that the strip runs stably on the layer cooling roller table.

2. The starting valve misalignment control method according to claim 1, characterized in that, The preset discrimination conditions include: controlling the thickness to be less than or equal to 2.5 mm and the rolling speed of the F7 stand to be greater than or equal to 9.5 m / s.

3. The initial valve misalignment control method according to claim 2, characterized in that, When the strip thickness is less than or equal to 2.5 mm and greater than 2.2 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a first number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

4. The starting valve misalignment control method according to claim 3, characterized in that, When the strip thickness is less than or equal to 2.2 mm and greater than 1.8 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a second number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

5. The initial valve misalignment control method according to claim 4, characterized in that, When the controlled thickness of the strip is less than or equal to 1.8 mm and greater than 1.5 mm, after the opening position of the upper start valve of the laminar cooling is determined, the opening position of the lower start valve of the laminar cooling is moved back by a third number of valve groups relative to the opening position of the upper start valve of the laminar cooling.

6. The initial valve misalignment control method according to claim 5, characterized in that, When the strip thickness is less than or equal to 1.5 mm, after the opening position of the upper start valve in the laminar cooling is determined, the opening position of the lower start valve in the laminar cooling is moved back by a fourth number of valve groups relative to the opening position of the upper start valve in the laminar cooling.

7. The initial valve misalignment control method according to claim 6, characterized in that, The first quantity, the second quantity, the third quantity, and the fourth quantity increase sequentially.

8. A starting valve misalignment control system, characterized in that, include: The data acquisition module is used to acquire the strip control thickness and rolling speed of the finishing mill F7 stand when the strip reaches the high temperature gauge at the finishing mill inlet. The valve control module is used to control the upper and lower starting valves of the laminar cooling system to execute different staggered control strategies according to the different control thickness ranges into which the strip control thickness falls when the strip control thickness and the rolling speed meet the preset discrimination conditions, so that the strip runs stably on the laminar cooling roller table.

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