A method for reminding reliable roll changing operation of a rolling mill

Abstract

The application discloses a kind of reminding methods of reliable roll changing operation of rolling mill, belong to the technical field of rolling mill roll changing, solve the technical problem that existing conversion open light is not self-resetting, there is security risk.The method is: through the improvement optimization of roll changing program algorithm of one bar rolling mill by automatic control means, strengthen by signal source reliability and program accuracy program algorithm in two places;Specifically, the following steps are included:Step one. accurate quantitative roll changing action data acquisition;Step two. test quantitative analysis to different roll changing operation state, test on-site to rolling line operation box;Step three. write roll changing operation signal calibration check program;Step four. optimize roll changing operation picture and operability indicator light alarm;Step five. system program simulation debugging, action and signal reach expected effect.The application strengthens by signal source reliability and action accuracy program algorithm in two places, which can ensure accurate action and timely alarm.

Description

Technical Field

[0001] This invention relates to the field of rolling mill roll changing technology, and more specifically, to a reminder method for reliable rolling mill roll changing operations. Background Technology

[0002] In the roll changing operation of bar mills in the metallurgical industry, the roll changing operation of a single bar uses a combination control logic programming method of stand selection + roll changing operation function conversion switch. The conversion switch must be a self-resetting conversion switch. However, many switches were later replaced with three-position switches on site, and the conversion switches were not self-resetting. During roll changing maintenance of a single bar mill, under different operating habits, there may be situations where two mills operate simultaneously (when the operator switches to another mill after operating the stand, the operation button of the previous mill is not returned to its original position), posing a safety hazard. In addition, during mill pressing / lifting operations, the stand selection is canceled without lifting the conversion switch to its original position. The stand lifting operation continues to maintain relay output under program control. If the operator makes an operational error, there is no alarm prompt, which can easily injure personnel and equipment maintenance personnel near other equipment on site. Once a personal safety accident occurs, the losses are incalculable. The main issues are as follows:

[0003] 1. All rolling mills in the intermediate and finishing mills have potential operational hazards, such as the lifting / lowering of vertical rolling mills, the slow exit / slow return of horizontal rolling mills, and the pressing / lifting of horizontal rolling mills. If the operation is not carried out in full accordance with the operating procedures, the above operations may continue under the program control, affecting normal rolling.

[0004] 2. Roll changing operations controlled by the same control box can be performed simultaneously. Although two mills cannot be selected for simultaneous operation in the same control box, the original program design selects the corresponding stand as the enable condition for the roll changing operation program block. If the roll changing operation switch does not return to its original position, the corresponding stand selection will be canceled, and the original stand operation will remain in its original state. If other stand selection buttons are pressed at this time, the stand enable function in the program and the roll changing operation switch will still be in a certain state of roll changing operation, and the subsequently selected stand will also immediately operate, resulting in two stands operating simultaneously.

[0005] 3. During roll changing operations, these types of operator negligence and failure to follow the procedures are not covered by the original program. Furthermore, the slow exit / slow return and pressing / lifting roll changing operations of the horizontal mill are concealed and not easy to detect the true nature of the fault. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a reminder method for reliable roll changing operation of a rolling mill.

[0007] The technical solution of this invention is: a reminder method for reliable roll changing operation in a rolling mill, which improves and optimizes the roll changing program algorithm of a single-bar rolling mill through automated control methods, strengthening both the reliability of the signal source and the accuracy of the program algorithm; specifically including the following steps:

[0008] Step 1. Accurately quantify the acquisition of roll changing action data. Add a parameter display table of rolling mill roll changing operation variables to the rolling line auxiliary PLC system to facilitate the test operator to observe the real-time information of the roll changing action button, changeover switch and solenoid valve output during roll changing. Record the historical data of all rolling line roll changing operation input and output point related parameters on the IBA data acquisition system for data acquisition and accurate comparison.

[0009] Step 2. Conduct quantitative analysis of different roll changing operation states. On-site test of the rolling line operation box. Specifically, cancel the corresponding frame selection when the roll changing operation switch is not returned to its original position. At this time, continue to press the other frame selection button and test whether the two frames operate simultaneously.

[0010] Step 3. Roll changing operation signal calibration and verification program: Write the roll changing operation signal calibration and verification program. Perform the roll changing operation in the on-site machine control box. After the corresponding action of pressing down / lifting is completed, if the selected frame is not directly canceled or the local / centralized button is directly switched to centralized, the corresponding action will also be reset. At this time, the machine-side enable indicator light will flash to remind the operator that there is a corresponding operation that has not been reset. If the display shows that the on-site roll changing operation is inconsistent with the forward rotation of the furnace roller table, steel rolling is not allowed to prevent the accident from escalating.

[0011] Step 4. Optimize the roll changing operation screen and the alarm indicator lights. By optimizing the program logic for judgment and control, the alarm will be displayed on the main control panel's rolling area alarm screen. The content will be "Local box operation inconsistency". Red text indicates an alarm and green text indicates a reset. If the control program shows that there is still control output after the frame selection is canceled, the enable indicator light next to the machine will flash to remind the operator that there is a corresponding operation that has not been returned to its original position.

[0012] Step 5. System program simulation and debugging: Utilizing the rolling mill shutdown and maintenance time, simulate the on-site operation situation of the operators at that time. Before the formal commissioning of the written control program algorithm logic, all output points are set to intermediate points and downloaded to the PLC in stages. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the real-time action of the rolling mill roll changing operation is tested, and the holding time and reset stop time of the original rolling mill roll changing operation output signal are monitored. At the same time, the program is simulated to ensure that the action and signal achieve the expected effect.

[0013] As a further improvement, in step one, the variable table refers to the PLC variable data acquisition system, which is a control component used for operation, information display, debugging and recording; real-time information refers to the input point information of the buttons and switches displayed during the rolling mill roll change operation, as well as the output point information of the solenoid valve; historical data recording refers to the data acquisition and recording of the entire process of the rolling mill roll change operation, including the stand selection information, roll change operation, and valve platform action information.

[0014] Furthermore, in step four, a WINCC alarm trend control is added to the WINCC screen and associated with a process variable. The data source for the trend can be an online variable or an archived variable, and this variable can be monitored in real time and queried historically.

[0015] Furthermore, the PLC is a Siemens PLC.

[0016] Beneficial effects

[0017] Compared with the prior art, the advantages of this invention are as follows:

[0018] This invention strengthens the reliability of the signal source and the accuracy of the action algorithm, ensuring accurate actions and timely alarm reminders. After the program is improved, it can effectively reduce the probability of personal injury to employees. Attached Figure Description

[0019] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0021] See Figure 1 This invention relates to a reliable roll changing operation reminder method for rolling mills. It improves and optimizes the roll changing program algorithm of a single-bar rolling mill through automated control methods, strengthening both the reliability of the signal source and the accuracy of the program algorithm. Specifically, it includes the following steps one through five:

[0022] Step 1. Accurately quantify roll changing action data acquisition. Add a roll changing operation variable table parameter display to the rolling line auxiliary PLC system to facilitate the test operator's observation of real-time information from the roll changing action buttons, selector switches, and solenoid valve outputs during roll changing. Record historical data of all rolling line roll changing operation input and output points on the IBA data acquisition system for data acquisition and accurate comparison.

[0023] The PLC is a Siemens PLC. The PLC variable table refers to the PLC variable data acquisition system, a control component used for operation, information display, debugging, and recording. Real-time information refers to the input point information of the buttons and switches displayed during the rolling mill roll change operation, as well as the output point information of the solenoid valves. Historical data recording refers to the complete data acquisition and recording of the stand selection information, roll change operation, and valve platform action information during the rolling mill roll change operation.

[0024] Step 2. Conduct quantitative analysis of different roll changing operation states. On-site test of the rolling line operation box: Specifically, cancel the selection of the corresponding frame when the roll changing operation switch is not in the return position. At this time, continue to press the other frame selection button and test whether the two frames operate simultaneously.

[0025] For example, testing the CD7 control box for finishing mills:

[0026] The 15# mill was selected for slow exit operation, but the selection of the 15# mill was cancelled before the slow exit operation was returned to the original position.

[0027] Immediately select mill #13 for operation; both mills #13 and #15 should be operated at a slow output.

[0028] The operation selection for rolling mill #13 has been cancelled; both #13 and #15 are still in slow output operation.

[0029] The slow-out selection switch was turned off, and both #13 and #15 are still performing slow-out operation.

[0030] When the rolling mill roll changing operations are controlled by the same control box, they can operate simultaneously. Although two rolling mills cannot be selected for simultaneous operation in the same control box, the original program design selects the corresponding stand as the enable condition for the roll changing operation program block. If the roll changing operation switch does not return to its original position, the corresponding stand selection will be canceled, and the original stand operation will remain in its original state. If other stand selection buttons are pressed at this time, the stand enable function in the program and the roll changing operation switch will still be in a certain state of roll changing operation, and the subsequently selected stand will also immediately operate, resulting in two stands operating simultaneously.

[0031] By testing all the on-site operation boxes in the rolling mill area, different types of hidden dangers were found. Not only the No. 7 rolling mill had this fault hazard in the pressing / lifting operation, but other rolling mills also had some operational hazards in the roll changing operation. This allowed us to focus our efforts on dealing with on-site problems.

[0032] Step 3. Roll changing operation signal calibration and verification program: Write the roll changing operation signal calibration and verification program. Perform roll changing operation in the on-site machine control box. After the corresponding action of pressing / lifting is completed, if the selected frame is canceled or the local / centralized button is directly switched to centralized, the corresponding action will be reset. At this time, the machine-side enable indicator (machine-side operation allowed) will flash to remind the operator that there is a corresponding operation that has not been reset. If the display shows that the machine-side roll changing operation is inconsistent with the forward rotation of the furnace roller conveyor, steel rolling is not allowed to prevent the accident from escalating. Modify and improve the roll changing program accordingly.

[0033] Step 4. Optimize the roll changing operation screen and operational indicator alarms. Control is determined by optimizing the program logic. Simultaneously, an alarm is displayed on the main control panel's rolling zone alarm screen, stating "Local box operation inconsistency." Red text indicates an alarm, and green text indicates a reset. If the control program shows control output even after the frame selection is cancelled, the machine-side enable indicator (machine-side operation allowed) will flash as an alarm to remind the operator that a corresponding operation has not been completed.

[0034] Furthermore, a WinCC alarm trend control is added to the WinCC screen and associated with a process variable. The data source for the trend can be an online variable or an archived variable, allowing for real-time monitoring and historical querying of this variable.

[0035] Step 5. System program simulation and debugging: Utilizing the rolling mill's downtime for maintenance, simulate the operator's on-site operation. Before formal deployment, all output points of the pre-written control program algorithm are set to intermediate points and downloaded to the PLC in stages. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the real-time actions of the rolling mill roll changing operation are tested, and the holding time and reset stop time of the original rolling mill roll changing operation output signals are monitored. Simultaneously, the program is simulated to ensure that the actions and signals achieve the expected results. All output points are set to intermediate points: they do not participate in program control, facilitating program debugging and testing.

[0036] By optimizing the automated roll changing operation procedure, operational control errors can be resolved, and timely alarms and displays can be displayed for operator misoperations. In addition, abnormal roll changing conditions on-site can be interlocked with the steel output of the rolling line, thus eliminating accidents in their infancy. After the procedure is improved, the probability of personal injury to employees can be effectively reduced.

[0037] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for providing a reminder for reliable roll changing operations in a rolling mill, characterized in that, The algorithm for the roll changing procedure of a single-bar mill was improved and optimized through automated control methods, with enhancements made in two areas: the reliability of the signal source and the accuracy of the program. Specifically, the following steps are included: Step 1: Accurately quantify the acquisition of roll changing action data. Add a parameter display table of rolling mill roll changing operation variables to the rolling line auxiliary PLC system to facilitate the test operator to observe the real-time information of the roll changing action button, changeover switch, and solenoid valve output during roll changing. Collect historical data records of all rolling line roll changing operation input and output point related parameters on the IBA data acquisition system for accurate comparison. Step 2: Conduct quantitative analysis of different roll changing operation states and perform on-site testing on the rolling line operation box. Specifically, cancel the selection of the corresponding frame when the roll changing operation switch is not in the return position. At this time, continue to press the other frame selection button and test whether the two frames operate simultaneously. Step 3: Write a calibration and verification program for the roll changing operation signal. Perform the roll changing operation in the on-site machine control box. After the corresponding pressing / lifting action is completed, if the selected frame is canceled or the local / central button is directly switched to central, the corresponding action will be reset. At this time, the machine enable indicator light will flash to remind the operator that there is a corresponding operation that has not been reset. Step 4: Optimize the roll changing operation screen and operational indicator alarms. By optimizing the control program logic, optimize the alarm screen display in the rolling area of ​​the main control panel. The abnormal state of local roll changing is interlocked with the steel output of the rolling line. If the display shows that the roll changing operation at the machine side is inconsistent, steel output and rolling are not allowed to prevent the accident from escalating. The alarm content displayed is "inconsistent operation of the local box". Red text indicates an alarm and green text indicates a reset. If the control program shows that there is still control output after the frame selection is canceled, the machine side enable indicator will flash an alarm to remind the operator that there is a corresponding operation that has not been returned to its original position. Step 5: System program simulation and debugging. Utilizing the rolling mill shutdown and maintenance time, simulate the on-site operation situation of the operators at that time. Before the formal operation of the written control program algorithm logic, all output points are set to intermediate points and downloaded to the PLC in stages. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the real-time action of the rolling mill roll changing operation is tested, and the holding time and reset stop time of the original rolling mill roll changing operation output signal are monitored. At the same time, the program is simulated to ensure that the action and signal achieve the expected effect.

2. The reminder method for reliable roll changing operation of a rolling mill according to claim 1, characterized in that, In step one, the variable table refers to the PLC variable data acquisition system, which is a control component used for operation, information display, debugging and recording; real-time information refers to the input point information of the buttons and switches displayed during the rolling mill roll change operation, as well as the output point information of the solenoid valves; historical data recording refers to the data acquisition and recording of the entire process of the rolling mill roll change operation, including the stand selection information, roll change operation, and valve platform action information.

3. The reminder method for reliable roll changing operation of a rolling mill according to claim 1, characterized in that, The PLC is a Siemens PLC.

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