Method and device for controlling the precise stopping of a rolling mill at the end of a strip

Abstract

The application discloses a method and device for controlling a rolling mill to accurately stop at a strip tail, wherein the method comprises the following steps: obtaining a mark point position of a steel strip; for any mark point in any pass, when the mark point has not left an entry coiler, controlling the entry coiler to track and record position information of the mark point; when the mark point leaves the entry coiler and has not entered an exit coiler, controlling the entry coiler and the exit coiler to synchronously track and record the position information of the mark point; and for any defect point, when the defect point has entered the exit coiler, controlling the entry coiler to clear the position information of the defect point. The application overcomes the situation that the position information of a mark point is lost or inaccurate in the prior art because the position information of the mark point is not tracked in a non-rolling process; effectively improves the reliability of length precision tracking and recording; and realizes accurate stopping at a strip tail in a rolling process.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and more specifically to a method and apparatus for controlling the precise stopping of a rolling mill at the tail end of the strip, a computing device, and a computer storage medium. Background Technology

[0002] A single-stand rolling mill (such as a 20-roll mill) includes a main mill and left and right coilers. It adopts a multi-pass reciprocating high-speed rolling process. In actual production, multiple production processes may cause the inability to accurately slow down and stop at the strip tail during high-speed rolling, resulting in premature stopping and reduced yield, or the strip tail being pushed into the mill, causing strip breakage and damage to the rolls.

[0003] Firstly, the inability to accurately decelerate and stop at the strip tail during high-speed rolling is due to the loss of strip tail length information or inaccurate remaining strip tail length. Specifically, in situations where a strip breakage requires jogging the coiler to rewind the strip head or when a stop requiring jogging control is needed, the main mill is in a non-rolling state. At this time, the system does not track the position information of the defect point and the strip tail by default. However, the position of the strip tail has already changed. Therefore, after restarting, the recorded position information of the defect point and the strip tail remains at the position before the stop, resulting in the inability to accurately decelerate and stop at the strip tail.

[0004] Secondly, in cases where coil repositioning is required: due to wedge-shaped steel strips or uneven adjustment, the position of the steel coil deviates from the mill center as rolling progresses. Before the finished product pass, to ensure the quality of the strip shape, the steel coil on the coiler must be manually moved to the center position of the mill. However, when repositioning the coil, the coiler must be necked, which triggers the automatic clearing of the coil diameter and strip tail position information. After the strip tail position information is automatically cleared, the position information of the strip tail cannot be obtained, which may also cause the inability to accurately decelerate and stop at the strip tail during high-speed rolling.

[0005] Secondly, after the current rolling pass is completed, it is necessary to stop the machine to change the rolling direction of the next pass. After stopping, the system will clear the remaining length and number of turns of the steel strip in that rolling direction. However, if the machine is started directly after clearing the remaining length and number of turns of the steel strip in that rolling direction, the machine may not be able to accurately slow down and stop at the end of the strip because the rolling direction has not been switched.

[0006] Because of the high rolling speed, generally above 500m / min, and even reaching 1000m / min, the above problems are usually prevented by slowing down and stopping the machine in advance to avoid the strip tail entering the mill. However, slowing down and stopping the machine in advance greatly reduces the rolling yield and efficiency. Moreover, if the operation is not timely, the strip tail will rush into the mill roll gap, causing serious roll damage accidents. Summary of the Invention

[0007] In view of the above problems, the present invention is proposed to provide a method and apparatus, computing device and computer storage medium for controlling the precise stopping of a rolling mill at the tail of the strip to overcome or at least partially solve the above problems.

[0008] According to one aspect of the present invention, a method for controlling the precise stopping of a rolling mill at the strip tail is provided, comprising:

[0009] The locations of marker points on the steel strip are obtained, including the strip tail point and at least one defect point;

[0010] For any marker point in any pass, before the marker point leaves the inlet winder, control the inlet winder to track and record the position information of the marker point; when the marker point leaves the inlet winder but has not yet entered the outlet winder, control the inlet winder and outlet winder to synchronously track and record the position information of the marker point.

[0011] For any defect point, once the defect point has entered the exit winding machine, control the inlet winding machine to clear the location information of the defect point.

[0012] Furthermore, the method also includes: detecting whether rolling force is involved in each pass; if rolling force is involved in a pass, the position information of the marker point of that pass is obtained by calculating the flow rate per second; if rolling force is not involved in a pass, the position information of the marker point of that pass is switched to direct length tracking.

[0013] Furthermore, the method also includes: for any pass, after the rolling of the pass is completed, determining whether the tail data of the pass can be cleared, so as to decide whether to clear the data of the inlet coiler based on the determination result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler.

[0014] Furthermore, for any given pass, after the rolling of that pass is completed, it is determined whether the tail data of that pass can be cleared, so as to decide whether to clear the data of the inlet coiler based on the determination result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler.

[0015] Determine whether the remaining number of steel strip turns on the inlet coiler is less than the remaining number of turns threshold and whether the remaining length of the steel strip is less than the remaining length threshold.

[0016] If it is determined that the remaining number of coils of steel strip on the inlet coiler is less than the remaining number of coils threshold and the remaining length of steel strip is less than the remaining length threshold, the data of the inlet coiler for that pass can be cleared so that the rolling direction of the next pass can be switched after the data of the inlet coiler is cleared; otherwise, an alarm prompt is issued so that the user can make a manual judgment on whether to clear the data of the inlet coiler based on the alarm prompt.

[0017] Furthermore, after manually switching the rolling direction, the method also includes determining whether the switched rolling direction is correct, so as to decide whether to roll according to the switched rolling direction based on the determination result.

[0018] Furthermore, the step of determining whether the switched rolling direction is correct, so as to decide whether to roll according to the switched rolling direction based on the determination result, specifically involves:

[0019] Determine whether the length of the inlet strip is greater than the length of the outlet strip under the changed rolling direction;

[0020] If it is determined that the length of the inlet strip is greater than the length of the outlet strip in the rolling direction, then the rolling direction is correct, and the machine is started to perform the next rolling pass according to the switched rolling direction; otherwise, an alarm is issued so that the operator can manually determine whether the switched rolling direction is correct based on the alarm.

[0021] Furthermore, the method also includes: for any rolling pass, adding intervention control of the coil shifting operation;

[0022] The intervention control of the roll relocation operation is as follows: if the roll relocation button is clicked, the system will trigger the shielded diameter reduction and zeroing operation, and after the diameter expansion button is clicked, the shielded diameter reduction and zeroing operation will be activated.

[0023] According to another aspect of the present invention, an apparatus for controlling the precise stopping of a rolling mill at the strip tail is provided, comprising:

[0024] A marking module is used to obtain the location of marking points on the steel strip, wherein the marking points include the strip tail point and at least one defect point;

[0025] The tracking and recording control module, for any marker point in any pass, is used to control the inlet winding machine to track and record the position information of the marker point before the marker point leaves the inlet winding machine; and to control the inlet winding machine and the outlet winding machine to synchronously track and record the position information of the marker point before the marker point leaves the inlet winding machine and enters the outlet winding machine.

[0026] The data clearing control module, for any given defect point, controls the inlet winding machine to clear the location information of the defect point when the defect point has already entered the outlet winding machine.

[0027] According to another aspect of the present invention, a computing device is provided, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other via the communication bus;

[0028] The memory is used to store at least one executable instruction that causes the processor to perform the operation corresponding to the method described above for controlling the mill to stop precisely at the tail of the strip.

[0029] According to another aspect of the present invention, a computer storage medium is provided, the storage medium storing at least one executable instruction that causes a processor to perform an operation corresponding to the method described above for controlling the mill to stop precisely at the tail of the strip.

[0030] A method and apparatus for precisely stopping a rolling mill at the tail end according to the present invention:

[0031] The present invention uses different coilers to track the position information of the marker point according to the different positions of the marker point, thereby overcoming the situation in the prior art where the position information of the marker point is not tracked during the non-rolling process, resulting in the loss or inaccuracy of the marker point position information; it effectively improves the reliability of length accuracy tracking and recording, realizes precise stopping at the strip tail during the rolling process, improves the yield, and reduces the problem of damage to the rolls caused by strip breakage entering the rolling mill.

[0032] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 This is a schematic diagram of the rolling process in a single-stand rolling mill.

[0035] Figure 2 A flowchart illustrating a method for precisely stopping a rolling mill at the tail of the strip, according to an embodiment of the present invention, is shown.

[0036] Figure 3 This is a schematic diagram illustrating the process of tracking the position of marker points during leftward rolling, provided as a specific embodiment of the present invention.

[0037] Figure 4 A process for determining whether the data of the inlet coiler has been cleared and whether the rolling direction of the next pass has been switched, provided in a specific embodiment of the present invention;

[0038] Figure 5A flowchart of intervention control for a roll-shifting operation is provided as a specific embodiment of the present invention;

[0039] Figure 6 A schematic diagram of a device for controlling the precise stopping of a rolling mill at the tail of the strip, provided by an embodiment of the present invention, is shown.

[0040] Figure 7 A schematic diagram of the structure of a computing device provided in an embodiment of the present invention is shown. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0042] For a single-stand rolling mill, the schematic diagram of its rolling process is as follows: Figure 1 As shown, Figure 1 If the rolling direction is to the left, then... Figure 1 The coiler on the right is the inlet coiler, and the coiler on the left is the outlet coiler. The length of the steel strip between the inlet coiler and the work roll of the single-stand rolling mill is the inlet steel strip length, and the length of the steel strip between the outlet coiler and the work roll of the single-stand rolling mill is the outlet steel strip length. When the actual rolling direction is switched to right rolling, the corresponding coiler on the left becomes the inlet coiler, and the coiler on the right becomes the outlet coiler.

[0043] Figure 2 A flowchart illustrating an embodiment of the present invention provides a method for precisely stopping a rolling mill at the tail end of a strip. This method is applied in a computing device. The computing device includes a processor, a memory, a communication interface, and a communication bus. The processor, the memory, and the communication interface communicate with each other via the communication bus. The memory stores at least one executable instruction, which causes the processor to perform operations corresponding to the method for precisely stopping the rolling mill at the tail end of the strip. Figure 2 As shown, the method includes the following steps:

[0044] Step S01: Obtain the location of the marking points on the steel strip. The marking points include the end point of the strip and at least one defect point.

[0045] Step S02: For any marker point in any pass, before the marker point leaves the inlet winder, control the inlet winder to track and record the position information of the marker point; when the marker point leaves the inlet winder but has not yet entered the outlet winder, control the inlet winder and outlet winder to synchronously track and record the position information of the marker point.

[0046] Step S03: For any defect point, when the defect point has entered the exit winding machine, control the inlet winding machine to clear the location information of the defect point.

[0047] Specifically, there are multiple marking points on the steel strip, with Figure 1 For example, Figure 1 The marking points include defect points B and C, as well as the tail point A. For defect point C, it begins to enter the exit coiler as rolling progresses, and for defect point B, it begins to leave the inlet coiler as rolling progresses.

[0048] In existing technologies, during non-rolling processes where a strip breakage occurs requiring a stop for rewinding or jogging control, neither the inlet nor outlet coiler records the position information of the marker points; during rolling processes, ... Figure 1 For example, for marker points after point B, i.e., marker points on the inlet coiler, the inlet coiler tracks and records their position information. For marker points between points B and C, i.e., marker points leaving the inlet coiler but not yet entering the outlet coiler, the outlet coiler records their position information, while the inlet coiler clears the position information of that marker point. For marker points before point C, i.e., marker points that have already entered the outlet coiler, the outlet coiler records their position information. Since existing technology only tracks and records the position information of marker points during the rolling process, but the positions of marker points can also change during the aforementioned non-rolling processes, this may lead to the loss of marker point position information.

[0049] In this embodiment, the position information of the marker points is tracked and recorded for both the rolling process and non-rolling processes. Specifically, it is based on... Figure 1 For example, for the marker points after B, i.e., the marker points on the inlet coiler, the inlet coiler tracks and records their position information; for the marker points between marker points B and C, i.e., those leaving the inlet coiler but not yet entering the outlet coiler, the inlet and outlet coilers simultaneously track and record their position information; for the marker points before C, i.e., those already entering the outlet coiler, the outlet coiler records their position information; and only after a defective point enters the outlet coiler is the inlet coiler controlled to clear the position information of that defective point, thus making the obtained position information more accurate. Therefore, this embodiment can obtain more accurate position information compared to the prior art, facilitating timely stopping of the rolling mill in the later stages of rolling based on the position information.

[0050] Again Figure 3 For example, Figure 3As shown, during the leftward rolling process, the coiler on the right is the inlet coiler, and the coiler on the left is the outlet coiler. For the marker point that has not exceeded marker point B, i.e., the marker point on the inlet coiler, the inlet coiler tracks and records its position information. For the marker point that enters between marker points B and C, i.e., the marker point that has left the inlet coiler but has not yet entered the outlet coiler, the inlet coiler and the outlet coiler simultaneously track and record its position information. For the marker point before C (this marker point is a defect point), i.e., the marker point that has already entered the outlet coiler, the outlet coiler records its position information, and the inlet coiler clears the position information of the defect point.

[0051] This invention employs different coilers to track the position information of the marker point based on its location, thereby overcoming the problem in the prior art where the position information of the marker point is not tracked during non-rolling processes, leading to the loss or inaccuracy of the marker point position information and the inability to accurately stop the roll at the tail. This effectively improves the reliability of length accuracy tracking and recording, enabling more accurate acquisition of the tail point position information, achieving precise stopping at the tail of the roll during rolling, increasing the yield, and reducing the problem of roll damage caused by strip breakage entering the rolling mill.

[0052] In one alternative approach, the method further includes: detecting whether rolling force is involved in each pass; if rolling force is involved in a pass, the position information of the marker point in that pass is obtained by calculating the flow rate per second; if no rolling force is involved in a pass, the position information of the marker point in that pass is switched to direct length tracking.

[0053] This embodiment also includes detecting whether rolling force is involved in each pass. When rolling force is involved, the steel strip will deform, so the position information is obtained by calculating the flow rate per second. When no rolling force is involved, the steel strip will not deform, so direct length tracking is used, thereby improving the tracking progress of the marker point and obtaining more accurate marker point position information, which in turn can obtain more accurate position information of the tail point, so as to achieve more precise stopping at the tail of the strip.

[0054] Specifically, when there is rolling force, the current position information of the marker point is calculated based on the position information of the marker point in the previous second and the flow rate of the steel strip per second; when there is no rolling force, the current position information of the marker point is directly calculated based on the length of the marker point's movement and the position information of the marker point in the previous second.

[0055] In an alternative approach, the method further includes: for any given pass, after the rolling of that pass is completed, determining whether the tail data of that pass can be cleared, so as to decide whether to clear the data of the inlet coiler based on the determination result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler.

[0056] Specifically, for any given pass, this embodiment also includes determining whether the strip tail data of that pass can be cleared after the rolling of that pass is completed, so as to clear the strip tail data after the rolling of that pass, avoid the accidental clearing of the strip tail data, thereby achieving the purpose of precise stopping at the strip tail and improving the yield.

[0057] In one alternative approach, for any given pass, after the rolling of that pass is completed, it is determined whether the strip tail data of that pass can be cleared. Based on the determination result, it is decided whether to clear the data at the inlet coiler, and after clearing the data at the inlet coiler, the rolling direction of the next pass is manually switched. Specifically:

[0058] Determine whether the remaining number of steel strip turns on the inlet coiler is less than the remaining number of turns threshold and whether the remaining length of the steel strip is less than the remaining length threshold.

[0059] If it is determined that the remaining number of coils of steel strip on the inlet coiler is less than the remaining number of coils threshold and the remaining length of steel strip is less than the remaining length threshold, the data of the inlet coiler for that pass can be cleared so that the rolling direction of the next pass can be switched after the data of the inlet coiler is cleared; otherwise, an alarm prompt is issued so that the user can make a manual judgment on whether to clear the data of the inlet coiler based on the alarm prompt.

[0060] Specifically, this embodiment uses the remaining number of turns threshold and the remaining length threshold to determine whether the data of the current pass inlet winding machine can be cleared.

[0061] like Figure 4 As shown, for example, if the rolling direction of a completed pass is leftward, the threshold for the number of remaining turns is 20, and the threshold for the remaining length is 50 meters (in actual implementation, the number of remaining turns at the end of rolling is much less than 20, and the remaining length is much less than 50 meters). Figure 4 (For ease of description, 20 turns and 50 meters are used for illustration). In this embodiment, when it is determined that the remaining number of turns of the steel strip on the inlet coiler is less than 50 turns and the remaining length of the steel strip is less than 50 meters, the data of the inlet coiler, that is, the data of the right coiler, can be cleared. Only after the data of the right coiler is cleared can the rolling direction of the next pass be manually switched. In special cases, when the data of the right coiler cannot be cleared automatically, the system will issue an alarm prompt so that the operator can manually determine whether to clear the data of the inlet coiler based on the alarm prompt.

[0062] In one alternative approach, after manually switching the rolling direction, the method further includes determining whether the switched rolling direction is correct, so as to decide whether to roll in accordance with the switched rolling direction based on the determination result.

[0063] In the existing technology, after a certain rolling pass is completed, it is necessary to stop the machine to change the rolling direction before restarting. After stopping, the remaining number of turns and remaining length data of that pass are cleared. After restarting the machine by changing the rolling direction, the tail of the strip from the previous pass is used as the head of the strip after restarting. However, due to misoperation, the machine may start before changing the rolling direction. When the machine starts before changing the rolling direction, the tail of the strip from the previous pass may rush into the rolls along the unchanged rolling direction, which may lead to the problem of not being able to stop the machine in a timely and accurate manner.

[0064] In this embodiment, a misoperation judgment condition is added to re-verify whether the changed rolling direction is correct, thereby avoiding the problem of mistakenly believing that the rolling direction has been changed when it has not actually been changed.

[0065] In one alternative approach, determining whether the switched rolling direction is correct, and deciding whether to proceed with rolling according to the switched rolling direction based on the determination result, specifically involves:

[0066] Determine whether the length of the inlet strip is greater than the length of the outlet strip under the changed rolling direction;

[0067] If it is determined that the length of the inlet strip is greater than the length of the outlet strip in the rolling direction, then the rolling direction is correct, and the machine is started to perform the next rolling pass according to the switched rolling direction; otherwise, an alarm is issued so that the operator can manually determine whether the switched rolling direction is correct based on the alarm.

[0068] Again Figure 4 For example, after manually switching the rolling direction, this embodiment adds a judgment condition to determine whether the length of the inlet steel strip is much greater than the length of the outlet steel strip after the switch is detected. If the length of the inlet steel strip is much greater than the length of the outlet steel strip, it means that the rolling direction has indeed been switched, and the machine can be started according to the switched rolling direction. Otherwise, an alarm is triggered so that the operator can manually verify after receiving the alarm. Figure 4 The 300-meter and 20-meter figures are examples given to illustrate the actual situation and are not the actual judgment conditions during system operation. The judgment condition for system operation time is whether the length of the inlet steel strip is much greater than the length of the outlet steel strip.

[0069] The error detection in this embodiment overcomes the problem of not being able to stop the machine in a timely and accurate manner because the tail data has been deleted due to the rolling direction not being switched.

[0070] In an alternative embodiment, the method further includes: for any rolling pass, adding intervention control for coil shifting operation;

[0071] The intervention control of the roll relocation operation is as follows: if the roll relocation button is clicked, the system will trigger the shielded diameter reduction and zeroing operation, and after the diameter expansion button is clicked, the shielded diameter reduction and zeroing operation will be activated.

[0072] In existing technology, when the rolling process is completed and the coil needs to be moved, the system automatically clears the length data of the coil after clicking the coil-moving operation. However, during the rolling process, when the position of the coil deviates from the center of the rolling mill, the coil-moving operation is also required. At this time, the system will also clear the length information of the coil. The loss of length information may cause problems with the rolling mill not being able to stop accurately at the tail end of the strip.

[0073] The intervention control for the roll-shifting operation added in this application can overcome the problem of length data being cleared due to the roll-shifting operation in the prior art.

[0074] Specifically, with Figure 5 For example, when it is necessary to move the coil, clicking the move coil button will turn the button green, indicating that the coil moving operation can be performed. At the same time, the system will trigger the shielding of the diameter reduction and zeroing operation. After the diameter reduction and zeroing operation is shielded, the diameter reduction button will flash, indicating that the diameter reduction and coil moving operation can be performed at this time, and there will be no loss of steel coil length information due to the coil moving operation.

[0075] After the reduction-diameter coil transfer operation is completed, clicking the expansion-diameter button again will stop the reduction-diameter button from flashing. Simultaneously, the previously disabled reduction-diameter zeroing operation will be activated, and the coil transfer button will turn gray, indicating to the operator that coil transfer control is complete. In this embodiment, the disabled reduction-diameter zeroing operation is activated after the coil transfer operation is completed, therefore it will not affect the normal process of clearing the coil length information, such as transferring and clearing the coil length information after rolling.

[0076] This embodiment overcomes the problem of the system failing to accurately stop the circuit due to the system mistakenly clearing the steel coil length information.

[0077] To illustrate the advantages of the embodiments of the present invention, the following description is provided in conjunction with an actual rolling production process:

[0078] In practical implementation, the method of this invention was applied to the No. 3 and No. 4 20-roll mills of the cold-rolled silicon steel plant of China Baowu Taigang Stainless Steel Co., Ltd. and the results were good. There were no more cases of failure to stop in time due to inaccurate or lost strip length.

[0079] Before the improvement, for each case of high-speed belt tailing failure: taking an average of 2 work rolls scrapped each time, and an average damage of 1mm to 4 intermediate rolls and 6 intermediate rolls, the cost was approximately 112,000 yuan. Based on 5 belt tailing failures per year, the annual cost reduction was 5 * 112,000 = 560,000 yuan. For each case of reduced yield due to early shutdown: taking an average of 3m wasted per roll, 10 rolls moved daily, resulting in an annual waste of approximately 10,000 meters (40t), with an average profit of 500 yuan per ton, the annual cost reduction was 40 * 500 = 20,000 yuan. Therefore, the comprehensive calculation shows that the improvement of this invention can increase efficiency by a total of 560,000 + 20,000 = 580,000 yuan per year.

[0080] The method of this invention optimizes strip tail tracking throughout the entire process based on actual conditions, and has universal applicability. It designs a method for tracking and recording marker point position information from three aspects: adding intervention control for coil shifting operations, and establishing a judgment condition for whether the rolling direction has changed after the machine starts. This effectively improves the recording and storage of steel coil length information throughout the entire process. When applied to a 20-roll mill, the tracking accuracy of strip tail and defect points is improved, completely solving the problems of length loss and deviation, and enhancing control stability. It eliminates the strip tail breakage problem caused by abnormal clearing of strip tail length information, while simultaneously improving production efficiency and rolled product yield.

[0081] Figure 6 A schematic diagram of an embodiment of the device for precisely stopping a rolling mill at the tail end of the strip, according to the present invention, is shown. Figure 6 As shown, the device includes: a marking module 01, a tracking and recording control module 02, and a data clearing control module 03, specifically:

[0082] The marking module 01 is used to obtain the position of the marking points of the steel strip, the marking points including the end point of the strip and at least one defect point;

[0083] For any marker point in any pass, the tracking and recording control module 02 is used to control the inlet winding machine to track and record the position information of the marker point before the marker point leaves the inlet winding machine; the tracking and recording control module 02 is also used to control the inlet winding machine and the outlet winding machine to synchronously track and record the position information of the marker point before the marker point leaves the inlet winding machine and enters the outlet winding machine.

[0084] For any defect point, the data clearing control module 03 is used to control the inlet winding machine to clear the location information of the defect point when the defect point has entered the exit winding machine.

[0085] Specifically, there are multiple marking points on the steel strip, with Figure 1 For example, Figure 1 The marking points include defect points B and C, as well as the tail point A. For defect point C, it begins to enter the exit coiler as rolling progresses, and for defect point B, it begins to leave the inlet coiler as rolling progresses.

[0086] In this embodiment, the position information of the marker points is tracked and recorded both during the rolling process and in both non-rolling processes. Specifically, after the marker module 01 obtains the position of the marker points on the steel strip, for any marker point in any pass, the tracking and recording control module 02 controls the inlet coiler to track and record the position information of the marker point before the marker point leaves the inlet coiler. The tracking and recording control module 02 is also used to control the inlet coiler and the outlet coiler to synchronously track and record the position information of the marker point before the marker point leaves the inlet coiler and enters the outlet coiler. Furthermore, for any defect point, the data clearing control module 03 only controls the inlet coiler to clear the position information of the defect point after the defect point enters the outlet coiler, thereby making the obtained position information more accurate. Therefore, this embodiment can obtain more accurate position information compared with the prior art, which facilitates timely stopping of the rolling mill in the later stage of rolling based on the position information.

[0087] This invention, based on the different positions of the marker points, controls different coilers to track the position information of the marker points, thereby overcoming the problem in the prior art where the position information of the marker points is not tracked during non-rolling processes, resulting in the loss or inaccuracy of the marker point position information and the inability to accurately stop at the tail of the strip. It effectively improves the reliability of length accuracy tracking records, thereby enabling more accurate acquisition of the position information of the tail of the strip, achieving accurate stopping at the tail of the strip during the rolling process, improving the yield, and reducing the problem of damage to the rolls caused by strip breakage entering the rolling mill.

[0088] In one alternative embodiment, the device further includes a detection module for detecting whether rolling force is involved in each pass; if rolling force is involved in a pass, the position information of the marker point in that pass is obtained by calculating the flow rate per second; if no rolling force is involved in a pass, the position information of the marker point in that pass is switched to direct length tracking.

[0089] This embodiment also includes a detection module, which is used to detect whether rolling force is involved in each pass. When rolling force is involved, the steel strip will deform, so the position information is obtained by calculating the flow rate per second. When no rolling force is involved, the steel strip will not deform, so direct length tracking is used, thereby improving the tracking progress of the marker point and obtaining more accurate marker point position information, which in turn can obtain more accurate position information of the tail point, so as to achieve more precise stopping at the tail of the strip.

[0090] In one alternative embodiment, the device further includes a first judgment module. For any given pass, the first judgment module is used to determine whether the tail data of the pass can be cleared after the rolling of that pass is completed, so as to decide whether to clear the data of the inlet coiler based on the judgment result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler.

[0091] Specifically, for any given pass, this embodiment also includes determining whether the strip tail data of that pass can be cleared after the rolling of that pass is completed, so as to clear the strip tail data after the rolling of that pass, avoid the accidental clearing of the strip tail data, thereby achieving the purpose of precise stopping at the strip tail and improving the yield.

[0092] In one alternative approach, the first judgment module determines whether the tail data of the current pass can be cleared, and decides whether to clear the data at the inlet coiler based on the judgment result, and manually switches the rolling direction of the next pass after clearing the data at the inlet coiler. Specifically:

[0093] The first judgment module determines whether the remaining number of steel strip turns on the inlet coiler is less than the remaining number of turns threshold and whether the remaining length of the steel strip is less than the remaining length threshold.

[0094] If the first judgment module determines that the remaining number of coils of steel strip on the inlet coiler is less than the remaining number of coils threshold and the remaining length of steel strip is less than the remaining length threshold, it can clear the data of the inlet coiler for that pass so that the rolling direction of the next pass can be switched after clearing the data of the inlet coiler; otherwise, it will issue an alarm prompt so that the user can make a manual judgment on whether to clear the data of the inlet coiler based on the alarm prompt.

[0095] Specifically, this embodiment uses the remaining number of turns threshold and the remaining length threshold to determine whether the data of the current pass inlet winding machine can be cleared.

[0096] In one alternative embodiment, after manually switching the rolling direction, the device further includes a second judgment module, which is used to determine whether the switched rolling direction is correct, so as to decide whether to roll according to the switched rolling direction based on the judgment result.

[0097] In this embodiment, a misoperation judgment condition is added to re-verify whether the changed rolling direction is correct, thereby avoiding the problem of mistakenly believing that the rolling direction has been changed when it has not actually been changed.

[0098] In one alternative approach, the second judgment module determines whether the switched rolling direction is correct, and decides whether to proceed with rolling according to the switched rolling direction based on the judgment result. Specifically:

[0099] The second judgment module determines whether the length of the inlet steel strip is greater than the length of the outlet steel strip under the changed rolling direction;

[0100] If the second judgment module determines that the length of the inlet strip is greater than the length of the outlet strip in the rolling direction, then the rolling direction is correct, and the machine starts rolling the next pass according to the switched rolling direction; otherwise, an alarm is issued so that the operator can manually judge whether the switched rolling direction is correct based on the alarm.

[0101] The error detection in this embodiment overcomes the problem of not being able to stop the machine in a timely and accurate manner because the tail data has been deleted due to the rolling direction not being switched.

[0102] In one alternative embodiment, the apparatus further includes an intervention control module, which, for any rolling pass, is used to add intervention control for the coil shifting operation.

[0103] Specifically: If the roll shifting button is clicked, the intervention control module triggers the system to disable the shrinkage and zeroing operation, and after the expansion button is clicked, the intervention control module activates the disabled shrinkage and zeroing operation.

[0104] The intervention control for the roll-shifting operation added in this application can overcome the problem of length data being cleared due to the roll-shifting operation in the prior art.

[0105] Specifically, when coil relocation is required, clicking the relocation button turns it green, indicating that the relocation operation can proceed. Simultaneously, the intervention control module triggers the system to disable the diameter reduction and zeroing operation. After the diameter reduction and relocation operation is completed, clicking the diameter increase button again activates the disabled diameter reduction and zeroing operation. In this embodiment, the disabled diameter reduction and zeroing operation is activated after the relocation operation, thus not affecting the normal process of clearing the coil length information, such as relocating and clearing the coil length information after rolling. This overcomes the problem of the system mistakenly clearing the coil length information, which could lead to inaccurate stopping.

[0106] To illustrate the advantages of the embodiments of the present invention, the following description is provided in conjunction with an actual rolling production process:

[0107] In practical implementation, the method of this invention was applied to the No. 3 and No. 4 20-roll mills of the cold-rolled silicon steel plant of China Baowu Taigang Stainless Steel Co., Ltd. and the results were good. There were no more cases of failure to stop in time due to inaccurate or lost strip length.

[0108] Before the improvement, for each case of high-speed belt tailing failure: taking an average of 2 work rolls scrapped each time, and an average damage of 1mm to 4 intermediate rolls and 6 intermediate rolls, the cost was approximately 112,000 yuan. Based on 5 belt tailing failures per year, the annual cost reduction was 5 * 112,000 = 560,000 yuan. For each case of reduced yield due to early shutdown: taking an average of 3m wasted per roll, 10 rolls moved daily, resulting in an annual waste of approximately 10,000 meters (40t), with an average profit of 500 yuan per ton, the annual cost reduction was 40 * 500 = 20,000 yuan. Therefore, the comprehensive calculation shows that the improvement of this invention can increase efficiency by a total of 560,000 + 20,000 = 580,000 yuan per year.

[0109] The method of this invention optimizes strip tail tracking throughout the entire process based on actual conditions, and has universal applicability. It designs a method for tracking and recording marker point position information from three aspects: adding intervention control for coil shifting operations, and establishing a judgment condition for whether the rolling direction has changed after the machine starts. This effectively improves the recording and storage of steel coil length information throughout the entire process. When applied to a 20-roll mill, the tracking accuracy of strip tail and defect points is improved, completely solving the problems of length loss and deviation, and enhancing control stability. It eliminates the strip tail breakage problem caused by abnormal clearing of strip tail length information, while simultaneously improving production efficiency and rolled product yield.

[0110] This invention provides a non-volatile computer storage medium storing at least one executable instruction that can execute the method for precisely stopping the rolling mill at the tail of the strip in any of the above method embodiments.

[0111] Figure 7 The diagram shows a structural schematic of an embodiment of a computing device according to the present invention. The specific embodiments of the present invention do not limit the specific implementation of the computing device.

[0112] like Figure 7 As shown, the computing device may include: a processor 402, a communications interface 404, a memory 406, and a communications bus 408.

[0113] The processor 402, communication interface 404, and memory 406 communicate with each other via communication bus 408. Communication interface 404 is used to communicate with other network elements, such as clients or other servers. The processor 402 executes program 410, specifically performing the relevant steps in the above-described method embodiment for controlling the mill to precisely stop at the tail end of the strip.

[0114] Specifically, program 410 may include program code that includes computer operation instructions.

[0115] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The apparatus for controlling the precise stopping of the rolling mill at the strip tail includes one or more processors, which may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0116] Memory 406 is used to store program 410. Memory 406 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0117] Specifically, program 410 can be used to cause processor 402 to execute the method for controlling the mill to stop precisely at the tail of the strip in any of the above method embodiments.

[0118] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, the embodiments of the present invention are not directed to any particular programming language. It should be understood that the content of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0119] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0120] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0121] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0122] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components according to the embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

Claims

1. A method for precisely stopping a rolling mill at the tail of the strip, characterized in that, include: The locations of marker points on the steel strip are obtained, including the strip tail point and at least one defect point; For any marker point in any pass, before the marker point leaves the inlet winder, control the inlet winder to track and record the position information of the marker point; When the marker point leaves the inlet winder but has not yet entered the outlet winder, the inlet winder and outlet winder are controlled to synchronously track and record the position information of the marker point. For any defect point, once the defect point has entered the exit winding machine, control the inlet winding machine to clear the location information of the defect point.

2. The method according to claim 1, characterized in that, The method further includes: detecting whether rolling force is involved in each pass; if rolling force is involved in a pass, the position information of the marker point of that pass is obtained by calculating the flow rate per second; if rolling force is not involved in a pass, the position information of the marker point of that pass is switched to direct length tracking.

3. The method according to claim 1, characterized in that, The method further includes: for any given pass, after the rolling of that pass is completed, determining whether the tail data of that pass can be cleared, so as to decide whether to clear the data of the inlet coiler based on the determination result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler.

4. The method according to claim 3, characterized in that, For any given pass, after the rolling of that pass is completed, it is determined whether the tail data of that pass can be cleared, so as to decide whether to clear the data of the inlet coiler based on the determination result, and to manually switch the rolling direction of the next pass after clearing the data of the inlet coiler. Determine whether the remaining number of steel strip turns on the inlet coiler is less than the remaining number of turns threshold and whether the remaining length of the steel strip is less than the remaining length threshold. If it is determined that the remaining number of coils of steel strip on the inlet coiler is less than the remaining number of coils threshold and the remaining length of steel strip is less than the remaining length threshold, the data of the inlet coiler for that pass can be cleared so that the rolling direction of the next pass can be switched after the data of the inlet coiler is cleared; otherwise, an alarm prompt is issued so that the user can make a manual judgment on whether to clear the data of the inlet coiler based on the alarm prompt.

5. The method according to claim 3, characterized in that, After manually switching the rolling direction, the method further includes determining whether the switched rolling direction is correct, so as to decide whether to roll according to the switched rolling direction based on the determination result.

6. The method according to claim 5, characterized in that, The process of determining whether the switched rolling direction is correct, so as to decide whether to roll according to the switched rolling direction based on the determination result, specifically involves: Determine whether the length of the inlet strip is greater than the length of the outlet strip under the changed rolling direction; If it is determined that the length of the inlet strip is greater than the length of the outlet strip in the rolling direction, then the rolling direction is correct, and the machine is started to perform the next rolling pass according to the switched rolling direction; otherwise, an alarm is issued so that the operator can manually determine whether the switched rolling direction is correct based on the alarm.

7. The method according to claim 1, characterized in that, The method further includes: for any rolling pass, adding intervention control of the coil shifting operation; The intervention control of the roll relocation operation is as follows: if the roll relocation button is clicked, the system will trigger the shielded diameter reduction and zeroing operation, and after the diameter expansion button is clicked, the shielded diameter reduction and zeroing operation will be activated.

8. A device for precisely stopping a rolling mill at the tail of the strip, characterized in that, include: A marking module is used to obtain the location of marking points on the steel strip, wherein the marking points include the strip tail point and at least one defect point; The tracking and recording control module, for any marker point in any pass, controls the inlet winding machine to track and record the position information of the marker point before the marker point leaves the inlet winding machine; Used to control the inlet and outlet winding machines to synchronously track and record the position information of the marker point when the marker point leaves the inlet winding machine and has not yet entered the outlet winding machine; The data clearing control module, for any given defect point, controls the inlet winding machine to clear the location information of the defect point when the defect point has already entered the outlet winding machine.

9. A computing device, comprising: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction that causes the processor to perform an operation corresponding to the method for controlling the mill to stop precisely at the tail of the strip as described in any one of claims 1-7.

10. A computer storage medium storing at least one executable instruction that causes a processor to perform an operation corresponding to the method for controlling a rolling mill to stop precisely at the tail of the strip as described in any one of claims 1-7.

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