CN113263057B - Monitoring and early warning method for rigidity precision of hot-rolled strip steel coiling machine - Google Patents
Monitoring and early warning method for rigidity precision of hot-rolled strip steel coiling machine Download PDFInfo
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Abstract
The invention provides a monitoring and early warning method for the rigidity precision of a hot-rolled strip steel coiling machine, and belongs to the technical field of hot-rolled strip steel automatic control. According to the method, firstly, real-time actual measurement data of a coiling calibration process and a first coil steel rolling process after calibration are collected, and after calibration is finished and the first coil steel rolling is finished, based on the collected real-time actual measurement data, all the precision evaluation indexes of the coiling machines are calculated respectively, all the precision evaluation index scores are determined based on a preset scoring system, all the scores are added to obtain a coiling machine rigidity precision comprehensive score, finally, the obtained coiling machine rigidity precision comprehensive score is compared with a preset scoring range in real time and judged, and when the obtained coiling machine rigidity precision comprehensive score exceeds the preset scoring range, an alarm is given. The method and the device monitor the calibration state of the coiling machine in real time, timely early warn when the precision abnormality occurs, track the long-term change trend of the rigidity of the coiling machine, and provide help for timely eliminating the equipment abnormality in the production field.
Description
Technical Field
The invention relates to the technical field of automatic control of hot-rolled strip steel, in particular to a precision evaluation method for the rigidity of a hot-rolled strip steel coiling machine.
Background
The coiling machine rigidity plays a key role in the aspects of stable production, coil quality and the like of the coiling machine, and by establishing a precision evaluation method of the rigidity of the hot rolled strip steel coiling machine, precision and effect judgment can be carried out on the coiling machine calibration and the first coil steel rolling process, and the method can help timely remove equipment and production faults on a production site.
The related studies on the coiler stiffness are currently: the article (hot continuous rolling coiler equipment gap analysis) proposes that the factors influencing the coiler gap can be rapidly judged and equipment maintenance can be performed by detecting and evaluating the coiler gap by detecting the coiler stiffness. When the winding drum is in different expansion diameter positions, corresponding roll gap values are measured by giving different pressure values. Since the gap value inherent to the equipment does not change, the stiffness of a certain auxiliary winding roller of the winding machine can be judged whether to be good or not according to the measured integrated gap value of the equipment. Fitting the winding diameters and the pressure values of the three auxiliary winding rollers respectively to obtain pressure value curves of the three auxiliary winding rollers respectively, wherein the smoothness and the superposition condition of the curves can reflect the advantages and disadvantages of the rigidity and the clearance of the equipment; the article (the rigidity research of a hot-rolled strip steel coiling machine) proposes that the states of a mandrel and a coil-assisting roller are adjusted according to the rigidity data of the coil-assisting roller, so that the stable coil-forming quality is realized. And respectively calculating the stiffness curves by monitoring roll gap pressure change data of the three auxiliary winding rolls in the process of expanding and contracting the mandrel from 50% to 100%. The stiffness of the auxiliary winding roller can effectively monitor the running states and the equipment gaps of the mandrel and the auxiliary winding roller of the coiling machine, and the trend management of the state of the coiling machine is realized through the stiffness data test and analysis.
At present, the research in the field of the rigidity of the coiling machine is less, the research is focused on the offline analysis and fitting of data, and no much research exists on how to evaluate the precision of the rigidity of the coiling machine currently. The method for evaluating the rigidity precision of the hot rolled strip steel coiling machine is established, the rigidity state of the coiling machine is monitored in real time, early warning is carried out in time when the rigidity precision is abnormal, the long-term change trend of the rigidity is tracked, and the method is helpful for timely eliminating equipment abnormality in a production field.
Disclosure of Invention
The invention aims to provide a precision evaluation method for the rigidity of a hot-rolled strip steel coiling machine, so as to solve the technical problem that the precision evaluation for the rigidity of the current coiling machine cannot be realized in the prior art.
According to the method, firstly, actual measurement data of a coiling calibration process and a first coil steel rolling process after calibration are collected in real time, rigidity precision evaluation indexes of coiling machines are calculated respectively based on the collected actual measurement data after calibration is finished and the first coil steel rolling is finished, then, all precision evaluation index scores are determined according to the values of all precision evaluation indexes based on a preset scoring system, all the scores are added to obtain a coiling machine rigidity precision comprehensive score, finally, the obtained coiling machine rigidity precision comprehensive score is compared with a preset scoring range in real time and judged, and when the obtained coiling machine rigidity precision comprehensive score exceeds the preset scoring range, an alarm is given.
The method specifically comprises the following steps:
(1) Collecting actual measurement data of a coiling calibration process and a first coil steel rolling process after calibration in real time;
(2) After the calibration is finished and the rolling of the first coil steel is finished, respectively calculating the rigidity precision evaluation index of each coiling machine based on the collected measured data;
(3) Determining the scores of all precision evaluation indexes according to the values of all precision evaluation indexes, and adding all scores to obtain the comprehensive score of the rigidity precision of the coiling machine;
(4) And comparing the obtained comprehensive score of the rigidity precision of the coiling machine with a preset score range in real time, judging, and alarming when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the preset score range.
The actual measurement data of the coiling calibration process in the step (1) comprises: the coiling machine calibration starting and ending signals, the coiling pinch roll operation side oil cylinder extension amount and the coiling pinch roll transmission side oil cylinder extension amount; the measured data of the first coil steel rolling process comprises the following steps: the coiling machine bites steel and coil unloading signals, a coiling pinch roll operation side roll gap, a coiling pinch roll transmission side roll gap, a No. 1 auxiliary roll gap, a No. 2 auxiliary roll gap, a No. 3 auxiliary roll gap and strip steel thickness values.
The evaluation index of the coiling machine rigidity in the step (2) comprises the following steps: the method comprises the following steps of calibrating deviation of two sides of the extending quantity of a pinch roll oil cylinder in the process, deviation of two sides of a roll gap of a first coil steel pinch roll, no. 1 auxiliary roll gap, no. 2 auxiliary roll gap and No. 3 auxiliary roll gap, wherein the calculating process of the deviation of the extending quantity of the pinch roll oil cylinder in the process is as follows:
subtracting the actual measurement curve of the extension quantity of the oil cylinder at the operation side of the pinch roll from the actual measurement curve of the extension quantity of the oil cylinder at the transmission side in the calibration process, and then taking the deviation value at the end moment of calibration, wherein the calculation formula is as follows:
CYL diff ＝(CYL OS -CYL DS )| t(GapZeroOff)
wherein ,CYLdiff Indicating the deviation of the two sides of the extending quantity of the pinch roll cylinder in the calibration process, and CYL OS Shows the extending curve and CYL of the oil cylinder at the operation side of the pinch roll DS Shows the curve of the extension of the oil cylinder at the transmission side of the pinch roll, t (GapZerooff) tableIndicating the calibration ending moment;
the calculation process of the deviation of the two sides of the roll gap of the first coil steel pinch roll is as follows:
subtracting the actual measurement curve of the pinch roll operation side roll gap from the actual measurement curve of the transmission side roll gap in the initial coil steel coiling process to obtain two sides of deviation curves, and taking the maximum value of the deviation curves, wherein the calculation formula is as follows
Gap diff ＝max(Gap OS -Gap DS )
wherein ,Gapdiff Representing the deviation of the two sides of the roll Gap of the first coil steel pinch roll and Gap OS Shows actual measurement curve and Gap of pinch roll operation side Gap DS Expressing a pinch roll transmission side roll gap actual measurement curve;
the calculation process of the gap of the number 1 auxiliary winding roller is as follows:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the 1 st auxiliary roll and the mandrel to obtain a 1 st auxiliary roll gap, wherein the calculation formula is as follows:
Gap Err1 ＝Gap wr1 -Thick
wherein ,GapErr1 Shows the Gap and Gap between the number 1 auxiliary winding roller in the coiling process of the first coil steel wr1 The roll gap value between the No. 1 auxiliary roll and the mandrel after the winding is completed in the circle 1 action is shown, and the Thick shows the target value of the product thickness;
the calculation process of the gap of the number 2 wrapper roller is as follows:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the No. 2 auxiliary roll and the mandrel to obtain the No. 2 auxiliary roll gap, wherein the calculation formula is as follows:
Gap Err2 ＝Gap wr2 -Thick
wherein ,GapErr2 Shows the Gap and Gap between No. 2 auxiliary rolls in the coiling process of the first coil steel wr2 The roll gap value between the No. 2 auxiliary roll and the mandrel after the winding is completed in the circle 1, and the thickness target value of the product is represented by the Thick;
the calculation process of the gap of the number 3 auxiliary winding roller is as follows:
after the 1 st turn of action is completed in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the No. 3 auxiliary roll and the mandrel to obtain the No. 3 auxiliary roll gap, wherein the calculation formula is as follows:
Gap Err3 ＝Gap wr3 -Thick
wherein ,GapErr3 Shows the Gap and Gap between the number 3 auxiliary winding roller in the winding process of the first coil steel wr3 The roll gap value between the No. 3 auxiliary roll and the mandrel after the winding is completed in the 1 st turn of action is shown, and the thickness target value of the product is shown by the Thick.
The comprehensive rigidity precision scoring of the coiling machine in the step (3) is divided into a four-level scoring system, which is specifically as follows:
determining a coiling machine stiffness evaluation index score according to the value of the coiling machine stiffness evaluation index through the following score distribution formula:
wherein ,sk Index indicating the k-th coiler stiffness evaluation k Score, thd of (a) k1 ～Thd k3 Index of evaluation Index k Different thresholds (different sites, different equipment and different working conditions, different thresholds are set according to site conditions), w 1 ～w 4 Index of evaluation Index k Scores in different ranges, w 1 ＝20.00,w 2 ＝10.00，w 3 ＝5.00,w 4 ＝0.00；
For the deviation of the two sides of the extending quantity of the pinch roll cylinder in the calibration process, the k1 ＝0.3,Thd k2 ＝0.4,Thd k3 ＝0.5；
For the deviation of the two sides of the roll gap of the first coil steel pinch roll, the k1 ＝1.0,Thd k2 ＝1.5,Thd k3 ＝2.0；
For the No. 1 wrapper gap, thd k1 ＝5.0,Thd k2 ＝6.0,Thd k3 ＝7.0；
For the No. 2 wrapper gap, thd k1 ＝5.0,Thd k2 ＝6.0,Thd k3 ＝7.0；
For the No. 3 wrapper gap, thd k1 ＝5.0,Thd k2 ＝6.0,Thd k3 ＝7.0。
The step (4) is specifically as follows:
determining a scoring Range [ thd ] min ,thd max ]The method comprises the steps of carrying out a first treatment on the surface of the Wherein thd min Lower limit value, thd, representing accuracy score of coiler stiffness max An upper limit value representing the accuracy score of the coiler stiffness; the scoring range is determined based on field reality, e.g. a certain field scoring range is determined as [80,90 ]]Then, alarm below 80, more than 90 are excellent, and 80-90 are qualified.
Comparing the obtained comprehensive score of the rigidity precision of the coiling machine with the determined score range in real time;
and when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the determined score range, alarming to remind on-site personnel to check the working state of the coiling machine.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the precision evaluation method of the rigidity of the hot rolled strip steel coiling machine is established, the calibration state of the coiling machine is monitored in real time, early warning is timely carried out when the precision is abnormal, the long-term change trend of the rigidity of the coiling machine is tracked, and the help is provided for timely eliminating equipment abnormality in a production site.
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FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a precision evaluation method for the rigidity of a hot-rolled strip steel coiling machine.
As shown in fig. 1, the method comprises the steps of collecting actual measurement data of a coiling calibration process and a first coil steel rolling process after calibration in real time, respectively calculating rigidity precision evaluation indexes of each coiling machine based on the collected actual measurement data after calibration is finished and the first coil steel rolling process is finished, determining various precision evaluation index scores according to values of various precision evaluation indexes based on a preset scoring system, adding various scores to obtain a coiling machine rigidity precision comprehensive score, comparing the obtained coiling machine rigidity precision comprehensive score with a preset scoring range in real time, judging, and alarming when the obtained coiling machine rigidity precision comprehensive score exceeds the preset scoring range.
The embodiment of the invention provides a precision evaluation method for the rigidity of a hot-rolled strip steel coiling machine, which is characterized in that the precision evaluation content of the rigidity of the coiling machine is decomposed into a plurality of specific indexes which are easy to quantify, the indexes are compared with corresponding thresholds under a four-level scoring system to obtain scoring results, and then the scoring results are added to obtain the precision comprehensive score of the rigidity of the coiling machine.
As shown in FIG. 1, S1, collecting real-time actual measurement data of a coiling calibration process and a first coil steel rolling process after calibration;
specifically, in this embodiment, the measured data collected in S1 includes: the coiling machine calibration starting and ending signals, the coiling pinch roll operation side oil cylinder extension amount and the coiling pinch roll transmission side oil cylinder extension amount; the measured data of the first coil steel rolling process comprises the following steps: the coiling machine bites steel and coil unloading signals, and the coiling pinch roll operation side roll gap, the coiling pinch roll transmission side roll gap, the number 1-3 auxiliary roll gap and the strip steel thickness value; and then, performing operations such as data arrangement, signal filtering and effective data interception on the acquired data to obtain data which need to be prepared before the rigidity precision evaluation of the rolling mill.
S2, respectively calculating the rigidity precision evaluation index of each coiling machine based on the collected measured data after the calibration is finished and the rolling of the first coil steel is finished;
specifically, in this embodiment, S2 above automatically starts corresponding calculation operations when the calibration is finished and the coil is unwound, and the time sequence for starting calculation is the falling edge of the calibration signal and the falling edge of the coil signal.
Wherein, the evaluation index of the rigidity precision of the coiling machine calculated in the step S2 comprises the following steps: the method comprises the steps of calibrating deviation of two sides of the extending quantity of a pinch roll cylinder, deviation of two sides of a roll gap of a first coil steel pinch roll, a No. 1 wrapper roll gap, a No. 2 wrapper roll gap and a No. 3 wrapper roll gap.
Further, the calculating process of the deviation of the two sides of the extension amount of the pinch roll cylinder in the calibrating process comprises the following steps:
subtracting the actual measurement curve of the extending quantity of the oil cylinder at the operation side of the pinch roll from the actual measurement curve of the extending quantity of the oil cylinder at the transmission side in the calibration process, and then taking the deviation value at the moment of calibration ending, wherein the calculation formula is as follows
CYL diff ＝(CYL OS -CYL DS )| t(GapZeroOff)
wherein ,CYLdiff Indicating the deviation of the two sides of the extending quantity of the pinch roll cylinder in the calibration process, and CYL OS Shows the extending curve and CYL of the oil cylinder at the operation side of the pinch roll DS The curve showing the protrusion amount of the oil cylinder at the operation side of the pinch roll is shown, and t (GapZerooff) shows the calibration ending moment.
Further, the calculating process of the deviation of the two sides of the roll gap of the first coil steel pinch roll comprises the following steps:
subtracting the actual measurement curve of the pinch roll operation side roll gap from the actual measurement curve of the transmission side roll gap in the initial coil steel coiling process to obtain two sides of deviation curves, and taking the maximum value of the deviation curves, wherein the calculation formula is as follows
Gap diff ＝max(Gap OS -Gap DS )
wherein ,Gapdiff Representing the maximum value and Gap of the deviation of the two sides of the roll Gap of the pinch roll in the coiling process of the first coil steel OS Shows actual measurement curve and Gap of pinch roll operation side Gap DS And the actual measurement curve of the roll gap at the transmission side of the pinch roll is shown.
Further, the calculating process of the No. 1 wrapper roller clearance includes:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the 1 st auxiliary roll and the mandrel to obtain the 1 st auxiliary roll gap, wherein the calculation formula is as follows
Gap Err1 ＝Gap wr1 -Thick
wherein ,GapErr1 Shows the Gap and Gap between the number 1 auxiliary winding roller in the coiling process of the first coil steel wr1 The roll gap value between the No. 1 auxiliary roll and the mandrel after the winding is completed in the 1 st turn of action is shown, and the thickness target value of the product is shown by the Thick.
Further, the calculating process of the No. 2 wrapper roller clearance includes:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the No. 2 auxiliary roll and the mandrel to obtain the No. 2 auxiliary roll gap, wherein the calculation formula is as follows
Gap Err2 ＝Gap wr2 -Thick
wherein ,GapErr2 Shows the Gap and Gap between No. 2 auxiliary rolls in the coiling process of the first coil steel wr2 The roll gap value between the No. 2 auxiliary roll and the mandrel after the winding is completed in the 1 st turn of action is shown, and the thickness target value of the product is shown by the Thick.
Further, the calculating process of the No. 3 wrapper roller clearance includes:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the thickness of the strip steel from the roll gap value of the No. 3 auxiliary roll and the mandrel to obtain the No. 3 auxiliary roll gap, wherein the calculation formula is as follows
Gap Err3 ＝Gap wr3 -Thick
wherein ,GapErr3 Shows the Gap and Gap between the number 3 auxiliary winding roller in the winding process of the first coil steel wr3 The roll gap value between the No. 3 auxiliary roll and the mandrel after the winding is completed in the 1 st turn of action is shown, and the thickness target value of the product is shown by the Thick.
S3, determining the scores of all precision evaluation indexes according to the values of all precision evaluation indexes based on a preset scoring system, and adding all scores to obtain the comprehensive score of the rigidity precision of the coiling machine;
specifically, in this embodiment, the implementation process of S3 specifically includes:
respectively constructing a four-level scoring system of the coiling machine rigidity evaluation index;
determining a coiling machine rigidity evaluation index score according to the value of the coiling machine rigidity evaluation index through the following score distribution formula based on the constructed four-level scoring system:
wherein ,sk Index indicating the k-th coiler stiffness evaluation k Score, thd of (a) k1 ～Thd k3 Index of evaluation Index k Is w 1 ～w 4 Index of evaluation Index k Scores in different ranges. The specific score is determined according to the actual site, for example, 5 evaluation indexes are provided on site, the total score is 100 minutes, the single index is 20 minutes, the deviation of the two sides of the extension of the pinch roll cylinder in the calibration process is within 1mm and 20 minutes, the deviation of the two sides of the extension of the pinch roll cylinder in the calibration process is 10 minutes, the deviation of the extension of the pinch roll cylinder in the calibration process is 0 minutes, the deviation of the extension of the pinch roll cylinder in the calibration process is more than 2mm, and the deviation of the extension of the pinch roll cylinder in the calibration process is left and right. Thus, a specific score is obtained.
And S4, comparing the obtained comprehensive score of the rigidity precision of the coiling machine with a preset score range in real time, judging, and alarming when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the preset score range.
Specifically, in this embodiment, the implementation process of S4 specifically includes:
determining a scoring Range [ thd ] min ,thd max ]The method comprises the steps of carrying out a first treatment on the surface of the Wherein thd min Lower limit value, thd, representing accuracy score of coiler stiffness max An upper limit value representing the accuracy score of the coiler stiffness;
comparing the obtained comprehensive score of the rigidity precision of the coiling machine with the determined score range in real time;
and when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the determined score range, alarming to remind on-site personnel to check the working state of the coiling machine.
The following describes specific embodiments.
Example 1
The method is applied to a certain 1580mm hot continuous rolling production line, and adopts the model configuration of 3 underground coiling machines.
The stiffness precision evaluation rule of the production line coiling machine is shown in table 1 (specifically, the stiffness precision evaluation rule of different production line coiling machines is determined according to actual conditions), and in particular, the calculated value needs to be processed by absolute value and then scored.
TABLE 1 certain 1580mm hot continuous rolling production line coiling machine rigidity precision evaluation rule list
According to the evaluation rule of table 1, the evaluation result of the precision of the rigidity of the coiling machine after a certain calibration of the production line is shown in table 2, and the calculation result, the scoring condition, the occupied weight, the comprehensive score of each rack and the like of each index of the rigidity of each coiling machine can be rapidly inquired from the table; for the case, the deviation of the two sides of the extending amount of the oil cylinder of the pinch roll in the calibration process of the coiling machine No. 3 is-0.43 mm, 5 minutes is obtained, the deviation of the two sides of the roll gap of the pinch roll in the coiling process of the first coil steel is 0.03mm, the gap of the auxiliary roll No. 1 is-6.49 mm, the gap is larger, 5 minutes are obtained, the gap of the auxiliary roll No. 2-3 is not buckled, and the total score is 70 minutes. The evaluation results of the rigidity of each coiling machine in the finish rolling in the calibration process can be clearly shown for process and equipment personnel from the table 2, so that the positioning and the checking of the equipment state of field personnel are facilitated.
Table 2 evaluation results table of the accuracy of the coiling machine rigidity
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (2)
1. A monitoring and early warning method for the rigidity precision of a hot-rolled strip steel coiling machine is characterized by comprising the following steps: the method comprises the following steps:
(1) Collecting actual measurement data of a coiling calibration process and a first coil steel coiling process after calibration in real time;
(2) After the calibration is finished and the coiling of the first coil steel is finished, respectively calculating the values of each rigidity precision evaluation index of each coiling machine based on the collected measured data;
(3) Determining the scores of all the rigidity precision evaluation indexes according to the values of all the rigidity precision evaluation indexes, and adding the scores of all the rigidity precision evaluation indexes to obtain the comprehensive score of the rigidity precision of the coiling machine;
(4) Comparing and judging the obtained comprehensive score of the rigidity precision of the coiling machine with a preset score range according to the field requirement in real time, and alarming when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the preset score range;
in the step (3), the step of (c),
determining the score of each stiffness precision evaluation index of the coiling machine according to the value of each stiffness precision evaluation index of the coiling machine through the following score distribution formula:
wherein ,Index k a value indicating the k-th stiffness accuracy evaluation index of the coiler,s k a score indicating the k-th stiffness accuracy evaluation index of the coiler, Thd k1 、Thd k2 、Thd k3 representation ofIndex k Is w 1 ~w 4 Representation ofIndex k The corresponding scores in different ranges are respectively 1 or 2 or 3 or 4 or 5; w (w) 1 、w 2 、w 3 、w 4 and Thdk1 、Thd k2 、Thd k3 The specific value of (c) is determined as follows,
w 1 ＝20.00，w 2 ＝10.00，w 3 ＝5.00，w 4 ＝0.00；
for the deviation of the two sides of the extending quantity of the oil cylinder of the coiling pinch roll in the coiling calibration process, the k1 ＝0.3，Thd k2 ＝0.4，Thd k3 ＝0.5；
For the deviation of the two sides of the roll gap of the first coil steel coiling pinch roll, thd k1 ＝1.0，Thd k2 ＝1.5，Thd k3 ＝2.0；
For the No. 1 wrapper gap, thd k1 ＝5.0，Thd k2 ＝6.0，Thd k3 ＝7.0；
For the No. 2 wrapper gap, thd k1 ＝5.0，Thd k2 ＝6.0，Thd k3 ＝7.0；
For the No. 3 wrapper gap, thd k1 ＝5.0，Thd k2 ＝6.0，Thd k3 ＝7.0；
In the step (1), the actual measurement data of the coiling calibration process comprises: the coiling machine calibration starting and ending signals, the coiling pinch roll operation side oil cylinder extension amount and the coiling pinch roll transmission side oil cylinder extension amount; the measured data of the coiling process of the first coil steel comprises the following steps: the method comprises the steps of a coiling machine biting and uncoiling signal, a coiling pinch roll operation side roll gap, a coiling pinch roll transmission side roll gap, a No. 1 auxiliary roll and mandrel roll gap value, a No. 2 auxiliary roll and mandrel roll gap value, a No. 3 auxiliary roll and mandrel roll gap value and a strip steel thickness target value;
in the step (2), the evaluation indexes of the rigidity precision of the coiling machine comprise: in the coiling calibration process, the deviation of the two sides of the extending amount of a coiling pinch roll cylinder, the deviation of the two sides of a roll gap of a first coil steel coiling pinch roll, a No. 1 auxiliary roll gap, a No. 2 auxiliary roll gap and a No. 3 auxiliary roll gap are coiled;
(1) the calculation process of the deviation of the two sides of the extending quantity of the oil cylinder of the coiling pinch roll in the coiling calibration process is as follows:
subtracting the actual measurement curve of the oil cylinder extension quantity at the operation side of the coiling pinch roll from the actual measurement curve of the oil cylinder extension quantity at the transmission side in the coiling calibration process, and then taking the deviation value at the calibration ending moment, wherein the calculation formula is as follows:
wherein ,CYL diff the deviation of the two sides of the extending quantity of the oil cylinder of the coiling pinch roll in the coiling calibration process is represented, and the absolute value of the deviation is taken to be the value Index of the 1 st rigidity precision evaluation Index of the coiling machine 1 ；CYL os The method comprises the steps of showing an extension curve of an oil cylinder at the operation side of a coiling pinch roll in the coiling calibration process;CYL DS the extension curve of the oil cylinder at the transmission side of the coiling pinch roll in the coiling calibration process is shown; t-GapZeroOff represents the calibration end instant;
(2) the calculation process of the deviation of the two sides of the roll gap of the first coil steel coiling pinch roll is as follows:
subtracting the actual measurement curve of the roll gap at the operation side of the coiling pinch roll from the actual measurement curve of the roll gap at the transmission side in the coiling process of the first coil steel to obtain two sides of deviation curves, and taking the maximum value of the deviation curves, wherein the calculation formula is as follows:
wherein ,Gap diff the deviation of the two sides of the roll gap of the first coil steel coiling pinch roll is expressed, and the absolute value of the deviation is taken as the value Index of the 2 nd rigidity precision evaluation Index of the coiling machine 2 ；Gap OS Expressing a roll gap actual measurement curve of the operation side of the coiling pinch roll;Gap DS expressing a roller gap actual measurement curve of the transmission side of the coiling pinch roller;
(3) the calculation process of the gap of the number 1 auxiliary winding roller is as follows:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting a target value of the thickness of the strip steel from a roll gap value of a 1 st auxiliary roll and a mandrel to obtain a 1 st auxiliary roll gap, wherein the calculation formula is as follows:
wherein ,Gap Err1 the gap of the No. 1 auxiliary winding roller in the winding process of the first coil steel is expressed, and the absolute value of the gap is taken as the value Index of the No. 3 rigidity precision evaluation Index of the winding machine 3 ；Gap wr1 The roll gap value between the No. 1 auxiliary roll and the mandrel after the winding is completed in the 1 st turn,ThickRepresenting a target value of the thickness of the strip steel;
(4) the calculation process of the gap of the number 2 wrapper roller is as follows:
after finishing the 1 st turn of action in the first coil steel coiling process, subtracting the target value of the thickness of the strip steel from the roll gap value of the No. 2 auxiliary roll and the mandrel to obtain the gap of the No. 2 auxiliary roll, wherein the calculation formula is as follows:
wherein ,Gap Err2 the gap of the No. 2 auxiliary winding roller in the winding process of the first coil steel is expressed, and the absolute value of the gap is taken as the value Index of the 4 th rigidity precision evaluation Index of the winding machine 4 ；Gap wr2 The roll gap value between the No. 2 auxiliary roll and the mandrel after the winding is completed in the 1 st turn,ThickRepresenting a target value of the thickness of the strip steel;
(5) the calculation process of the gap of the number 3 auxiliary winding roller is as follows:
after the 1 st turn of action is completed in the first coil steel coiling process, subtracting a target value of the thickness of the strip steel from a roll gap value of the No. 3 auxiliary roll and the mandrel to obtain a No. 3 auxiliary roll gap, wherein the calculation formula is as follows:
wherein ,Gap Err3 the gap of the No. 3 auxiliary winding roller in the winding process of the first coil steel is expressed, and the absolute value of the gap is taken as the value Index of the 5 th rigidity precision evaluation Index of the winding machine 5 ；Gap wr3 The roll gap value of the auxiliary roll No. 3 and the mandrel after the winding is completed in the circle 1;Thickindicating the target value of the thickness of the strip steel.
2. The method for monitoring and pre-warning the rigidity precision of the hot-rolled strip coiler according to claim 1, which is characterized in that: the step (4) specifically comprises the following steps:
presetting scoring range according to site requirementthd min ,thd max ]； wherein ,thd min a lower limit value representing the overall score of the coiler stiffness accuracy,thd max an upper limit value representing the overall score of the coiling machine stiffness accuracy;
comparing the obtained comprehensive score of the rigidity precision of the coiling machine with the preset score range in real time;
and when the obtained comprehensive score of the rigidity precision of the coiling machine exceeds the preset score range, alarming to remind on-site personnel to check the working state of the coiling machine.
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