A method for controlling the simultaneous online operation of two hot-rolled coils.

Abstract

This invention relates to a control method for simultaneous online coiling of two steel sections in hot continuous rolling, comprising the following steps: S1, constructing a head-tail tracking module and a simultaneous online buffer for the two steel sections; S2, the head-tail tracking module tracks the head-tail position data of each of the two rolled sections when they are simultaneously online, and sends the head-tail position data to the coiling computer; S3, the process machine receives the coiling machine function selection, and sends the actual control parameters to the simultaneous online buffer for the two steel sections according to the coiling machine function selection; the coiling computer sends the actual control parameters to the coiling machine according to the on-site strip logic. This solution solves the problem of flashing malfunction in hot strip inspection, enhances the stability of the system, thereby meeting the control requirements for online coiling of two steel sections, improving the coiling rhythm of the coiling machine, and thus improving the overall rolling rhythm of hot continuous rolling.

Description

Technical Field

[0001] This invention belongs to the technical field of steel rolling equipment, and relates to the control of the coiling device of a hot continuous rolling mill, specifically a control method for simultaneously online coiling two steels in a hot continuous rolling mill. Background Technology

[0002] The coiler is a crucial piece of equipment in a hot rolling production line, used to coil hot-rolled strip steel into coils. Located after the finishing mill, the coiler is the final step in the hot continuous rolling production line.

[0003] The existing coiling computer model performs calculations in the coiling area based on the incoming material conditions, finished product specifications, and performance requirements to obtain the set values ​​for the output roller table and coiler. During the coiling process, the coiling computer has a pre-set buffer (BO). The BO can only receive new data settings from the process machine after the previous strip has been coiled, resulting in low coiling efficiency and limiting the rolling rhythm. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a control method for simultaneously online coiling of two steel bars in hot continuous rolling, which simultaneously meets the control requirements for online coiling of two steel bars and improves the coiling rhythm of the coiler to meet the overall rolling rhythm of hot continuous rolling.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for controlling the simultaneous online operation of two hot-rolled coils includes the following steps:

[0007] S1. Construct a head-and-tail tracking module and a dual-steel simultaneous online cache;

[0008] S11. Constructing the head-and-tail tracking module specifically includes:

[0009] The input terminal of the microprocessor with data classification function is electrically connected to the output terminal of each sensor, and the output terminal of the microprocessor is electrically connected to the winding computer.

[0010] S12. Constructing a dual-steel simultaneous online cache specifically includes:

[0011] The pre-defined buffer BO in the winding computer is split into two buffers, BO1 and BO2; the field strip logic is set for the two buffers, including:

[0012] When data enters the BO1 buffer, a steel flag is set in BO1;

[0013] When the finishing mill bites steel, it determines whether BO2 is occupied. If BO2 is occupied, it enters a waiting state. If BO2 is not occupied, it writes data into the BO2 buffer to establish the BO2 occupancy flag. After successful writing, it resets the BO1 steel availability flag.

[0014] S2. The head and tail tracking module tracks the head and tail position data of the two rolled pieces when they are online at the same time, and sends the head and tail position data to the coiling computer.

[0015] S3. The process machine receives the winding function selection and sends the actual control parameters to the dual steel online cache according to the winding function selection; the winding computer sends the actual control parameters to the winding machine according to the field strip logic.

[0016] Furthermore, in S1, after tracking the head and tail position data of the two steel pieces, a correction process is also included:

[0017] Using the bite and throw of steel at the finishing mill stand as the tracking starting point, a tracking correction window is established. When the head and tail tracking reaches the physical position range corresponding to a certain hot inspection window, a hot inspection is performed and a correction is made; if the tracking distance is outside the window when a hot inspection is performed, no correction is made. This scheme ensures that the accuracy of tracking is not affected by whether the hot inspection is missed or arrives early.

[0018] "Bite" refers to the moment when the head of the rolled piece enters the rolling mill and is rolled; "throw" refers to the moment when the tail of the rolled piece leaves the rolling mill.

[0019] Furthermore, S1 also includes tracking reset logic for constructing the head and tail tracking module:

[0020] Normal reset is performed when switching between entering and exiting the die rolling mill or during emergency / rapid stop operations; head tracking is reset when the material head tracking is greater than the distance from the finishing mill stand to the drum; tail tracking is reset when the material tail tracking is greater than the distance from the finishing mill stand to the drum; abnormal tracking reset is performed when the tracking length is greater than the maximum limit value or the tracking timeout occurs.

[0021] Furthermore, the tracking reset of the second steel piece is initiated 2 seconds after the tracking reset of the first steel piece at its tail. When both steel pieces are wound online simultaneously, there is a sequence of entry; the first steel piece to enter the winding is the first steel piece, and the latter is the second steel piece.

[0022] Furthermore, in S12, after the coiler bites the steel, there is a 1-second delay to reset the BO2 occupancy flag, and BO2 is re-accepted for new data settings.

[0023] Definitions:

[0024] Winding machine function selection: There are multiple winding machines in the same production line. Winding machine function selection means selecting a specific winding machine to transmit relevant control parameters. For example, different winding machines have different numbers. The process machine selects the corresponding number according to the actual operation. The dual steel online buffer sends the relevant control settings to the winding machine corresponding to the number according to the number.

[0025] Actual control parameters: These are the parameters used to control the winding machine to perform specific actions. The method of obtaining these parameters is irrelevant to this solution and will not be elaborated further.

[0026] Finishing mill stand: During the finishing mill process, there are usually multiple finishing mill stands in the area where the finishing mill is located. The finishing mill stand is the stand closest to the exit area of ​​the finishing mill stand. Assuming that the finishing mill has seven sets of finishing mill stands from the inlet to the outlet of the workpiece, F1 to F7, then the finishing mill stand is F7 finishing mill stand.

[0027] Hot detection: refers to on-site sensor detection, the function of which is to determine the position of the rolled piece. For example, when the head of the rolled piece reaches a certain hot detection position, it is considered a hot detection, and the electrical signal changes from 0 to 1. When the tail leaves a certain hot detection position, the hot detection signal is extinguished, and the electrical signal changes from 1 to 0. Hot detection not occurring means that the head of the rolled piece has not been detected to have reached that position. Hot detection occurring early means that the time when the rolled piece is detected to have reached that position is earlier than the predetermined time.

[0028] The beneficial effects of this invention are as follows:

[0029] Compared to existing technologies, this solution uses full-length tracking of the two steel pieces to trigger state switching, which solves the problem of malfunction due to flashing during hot detection, enhances system stability, and thus meets the online control requirements for coiling two steel pieces, improves the coiling rhythm of the coiler, and consequently improves the overall rolling rhythm of hot continuous rolling.

[0030] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a flowchart of a control method for simultaneously online hot rolling of two steel bars according to the present invention;

[0033] Figure 2 This is a hardware block diagram for an embodiment. Detailed Implementation

[0034] 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, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0036] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0037] Please see Figures 1-2 This is a method for controlling the simultaneous online operation of two hot-rolled coils, comprising the following steps:

[0038] A winding control tracking system is constructed, using the core head and tail tracking module MTR block for material head and tail tracking, and establishing data tracking between the two steel pieces.

[0039] The head-and-tail tracking module specifically includes:

[0040] Structure and signal transmission connection: The input terminal of the microprocessor with data classification function is electrically connected to the output terminal of each sensor, and the output terminal of the microprocessor is electrically connected to the winding computer. The microprocessor receives the data collected by the sensors and sends the collected data to the process machine.

[0041] Tracing logic construction:

[0042] When the material head tracking exceeds the distance from the finishing mill stand to the drum (FM-MD distance), head tracking is reset; when the material tail tracking exceeds the FM-MD distance, tail tracking is reset; when the tracking length exceeds the maximum limit or tracking timeout, a tracking abnormality reset is performed. Additionally, normal resets are performed when switching between entering and exiting the die mill or during emergency / rapid stop operations. The tracking start condition for the second steel piece is that the first steel piece has not yet been discarded (i.e., the tail tracking of the first steel piece has not been reset). The tracking reset of the second steel piece is initiated 2 seconds after the tail tracking reset of the first steel piece (i.e., 2 seconds after the first steel piece's winding load relay is de-energized).

[0043] Follow-up corrections:

[0044] Head-to-tail tracking uses the bite and throw of steel at the finishing mill stand as the starting point for tracking. Then, a tracking correction window is set. When the head-to-tail tracking reaches the window of a certain physical position of the hot inspection, the hot inspection will detect and make corrections. If the tracking distance is not within the window when the hot inspection is detected, no correction will be made.

[0045] Once the system is built, the control logic of the response device is activated by tracking the head and tail positions, ensuring that the accuracy of tracking is not affected by whether the thermal detector fails to arrive or arrives early.

[0046] Construct a dual-steel online cache:

[0047] The pre-set buffer for the double-coil rolling mill is divided into two buffers, BO1 and BO2. The process machine issues settings based on the coiler's selectability, and the data enters the BO1 buffer. Simultaneously, a steel-on-demand flag is established on BO1. After the finishing mill bites steel, it checks if BO2 is occupied (steel-on-demand). If occupied, it waits; otherwise, it writes to the BO2 buffer, establishing a BO2 occupancy flag. Upon successful writing, the BO1 steel-on-demand flag is reset. After either coiler bites steel, there is a 1-second delay before resetting the BO2 occupancy flag. BO2 can accept new data settings.

[0048] The head and tail tracking module tracks the head and tail position data of the two rolled pieces when they are online simultaneously, and sends the head and tail position data to the coiling computer. The process machine receives the coiling machine function selection and sends the actual control parameters to the dual-steel online buffer according to the coiling machine function selection. The coiling computer sends the actual control parameters to the coiling machine according to the on-site strip logic. The coiling machine performs rolling according to the actual control parameters, thereby meeting the rolling requirements of dual-steel rolling. Through the above optimized control strategy, the stability of the hot continuous rolling coiling system is enhanced, the control requirements of coiling two steel pieces online simultaneously are met, and the rolling rhythm is improved.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the simultaneous online operation of two steel coils in hot continuous rolling, characterized in that: Includes the following steps: S1. Construct a head-and-tail tracking module and a dual-steel simultaneous online cache; S11. Constructing the head-and-tail tracking module specifically includes: The input terminal of the microprocessor with data classification function is electrically connected to the output terminal of each sensor, and the output terminal of the microprocessor is electrically connected to the winding computer. S12. Constructing a dual-steel simultaneous online cache specifically includes: The pre-defined buffer BO in the winding computer is split into two buffers, BO1 and BO2; the field strip logic is set for the two buffers, including: When data enters the BO1 buffer, a steel flag is set in BO1; When the finishing mill bites steel, it determines whether BO2 is occupied. If BO2 is occupied, it enters a waiting state. If BO2 is not occupied, it writes data into the BO2 buffer to establish the BO2 occupancy flag. After successful writing, it resets the BO1 steel availability flag. S2. The head and tail tracking module tracks the head and tail position data of the two rolled pieces when they are online at the same time, and sends the head and tail position data to the coiling computer. S3. The process machine receives the winding function selection and sends the actual control parameters to the dual steel online cache according to the winding function selection; the winding computer sends the actual control parameters to the winding machine according to the field strip logic.

2. The control method for simultaneous online operation of two steel coils in hot continuous rolling mill according to claim 1, characterized in that: S1 also includes tracking reset logic for constructing the head and tail tracking module: Normal reset is performed when switching between entering and exiting the die rolling mill or during emergency / rapid stop operations; head tracking is reset when the material head tracking is greater than the distance from the finishing mill stand to the drum; tail tracking is reset when the material tail tracking is greater than the distance from the finishing mill stand to the drum; abnormal tracking reset is performed when the tracking length is greater than the maximum limit value or the tracking timeout occurs.

3. The control method for simultaneous online operation of two steel bars in hot continuous rolling mill according to claim 2, characterized in that: The tracking reset of the second piece of steel is initiated 2 seconds after the tracking reset of the first piece of steel at its tail.

4. The control method for simultaneous online operation of two hot-rolled coils according to claim 1, characterized in that: In S12, after the coiler bites the steel, there is a 1-second delay to reset the BO2 occupancy flag, and BO2 will accept new data settings again.

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