CN112108524A - Method for realizing accurate positioning of tail of cold-rolled strip steel - Google Patents

Method for realizing accurate positioning of tail of cold-rolled strip steel Download PDF

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Publication number
CN112108524A
CN112108524A CN201910545285.XA CN201910545285A CN112108524A CN 112108524 A CN112108524 A CN 112108524A CN 201910545285 A CN201910545285 A CN 201910545285A CN 112108524 A CN112108524 A CN 112108524A
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uncoiler
strip steel
lns
residual
tail
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CN112108524B (en
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杨庆玲
王金华
高辉
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/72—Rear end control; Front end control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/16—Unwinding or uncoiling
    • B21C47/18—Unwinding or uncoiling from reels or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0064—Uncoiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product
    • B21B2273/16—Tail or rear end
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention relates to a method for realizing accurate positioning of the tail of cold-rolled strip steel, which comprises the following steps: step 1: determining a grading automatic deceleration point and a deceleration distance; step 2: determining the residual length of the strip steel on the uncoiler; and step 3: the accurate positioning of the waste tape tail before the double-cutting shear. The technical scheme mainly solves the problems that the prior art is poor in positioning precision, much in manual intervention, frequent in strip steel tail escape and the like, and realizes efficient positioning and shearing, so that the production yield is improved.

Description

Method for realizing accurate positioning of tail of cold-rolled strip steel
Technical Field
The invention relates to a positioning method, in particular to a method for accurately positioning the tail of cold-rolled strip steel, and belongs to the technical field of cold-rolled electrical technology.
Background
In a modern cold continuous rolling mill set, strip steel is uncoiled through an uncoiler, a straightening machine corrects the plate shape of the head of the strip steel, after double-cutting shears shear the bad strip head, the head is threaded to a welding machine, and the strip head is welded with the strip tail of the previous roll corrected by the straightening machine at the welding machine so as to realize the continuous rolling of the strip steel. Two adverse effects can be caused by positioning errors of the belt tail in the production process: one is can't realize the shearing of taking the tail according to the shearing sword number of setting for, if the location distance of cutting at two cuts is short partially, leads to the poor tape tail of board type not to cut, need manual backset and utilize the bad tape tail of scissors shearing board type of welding machine behind the whipping to the welding machine, welds again, seriously influences the production rhythm of unit, if the location distance of cutting at two is long partially, again influences the output value of unit, causes certain economic loss. And secondly, the tail of the belt directly passes through the double-cutting shears, the tail of the belt cannot be cut, and the tail of the belt can only be manually rolled back to the double-cutting shears, so that the operator is required to have a higher level and the unit can recover the normal time.
Aiming at the current situation, a technician researches and adopts a method for comparing an automatic deceleration distance Lss obtained by calculation of a control system with a residual length value Lns of strip steel on an uncoiler to solve the current problem, namely when the Lss is more than or equal to Lns, a deceleration command is output to realize the function of positioning the strip tail, and the problem that the strip tail is abnormal due to the fact that certain effect exists through field verification but the positioning error of the strip tail still exists frequently is solved. Because the calculation precision of the speed reduction distance Lss and the residual length value Lns of the strip steel on the uncoiler cannot be guaranteed when the strip tail is positioned, if the calculation deviation is greater than the length of the waste strip tail, the actual strip tail positioning function cannot be realized, the positioning length of the strip tail is uncontrollable, and even the strip tail escaping phenomenon can occur, the accurate shearing positioning of the strip tail has important significance for the continuous and stable production of a unit.
Through Chinese patent retrieval, a patent 201010266206.0 'a method for solving the problem of loop punching and drifting of an acid rolling on-line production line' is retrieved, which mainly solves the phenomenon of strip escaping possibly occurring in the drifting of strip steel when the sleeve punching is accelerated at the entrance, but does not relate to how to ensure the precision of strip tail positioning. The set drift speed value is input by an operator, and the safety compensation distance values required by different drift speeds are different, which means that the operator needs to set corresponding safety distance compensation values on an operation picture according to the set drift speed. The compensation value of the safety distance is improperly set, the positioning precision of the strip tail is not affected, and even the strip steel can escape from the strip tail when the set value is too small, so that a new scheme is urgently needed to solve the technical problem.
Disclosure of Invention
The invention provides a method for accurately positioning the tail of cold-rolled strip steel aiming at the problems in the prior art, and the technical scheme mainly solves the problems of poor positioning precision, much manual intervention, frequent strip tail escape and the like in the prior art, and realizes efficient positioning and shearing so as to improve the production yield.
In order to achieve the purpose, the technical scheme of the invention is that the method for accurately positioning the tail of the cold-rolled strip steel is characterized by comprising the following steps:
step 1: determining a grading automatic deceleration point and a deceleration distance;
step 2: determining the residual length of the strip steel on the uncoiler;
and step 3: the accurate positioning of the waste tape tail before the double-cutting shear.
As an improvement of the invention, step 1 is to determine the automatic deceleration point and the deceleration distance in a grading way; specifically, the automatic speed reduction process of the unit is divided into the following 3 stages: a first segment of deceleration V → Vc1, a second segment of deceleration Vc1 → Vc2 and a third segment of deceleration Vc2 → 0, respectively;
the duration of Vc1 after the first stage deceleration is Tc1, and the calculated deceleration distance Lss is related as follows:
Figure BDA0002103746570000021
Ls＝V×TD+V×TS+Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
the duration of the second period of post-deceleration Vc2 is Tc2, and the calculated deceleration distance Lss' is as follows:
Figure BDA0002103746570000022
L's＝Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
and the speed of the third section of speed reduction unit is reduced to 0, so that the positioning of the belt tail is realized. The calculated deceleration distance Lss "is as follows:
Figure BDA0002103746570000023
L″s＝Vc2×TD+Vc2×TS；
in the formula:
lss, Lss', Lss ": calculating the deceleration distance in the first, second and third sections;
ls, Ls', Ls ": the safe distance compensation values of the first, second and third stages of speed reduction processes;
TD: the control system delays the response time (fixed value) by the automatic speed reduction command;
ts: the deceleration S-curve delay response time (fixed value);
v: the running speed of the unit;
vc1, Vc 2: a speed holding value (fixed value) at the time of automatic deceleration;
tc1, Tc 2: speed holding times (fixed values) of Vc1, Vc 2;
α: acceleration (a fixed value set according to the performance of unit equipment) when the unit accelerates and decelerates;
in conclusion, the automatic deceleration distances Lss, Lss 'and Lss' obtained by the calculation are compared with the remaining length value Lns of the strip steel on the uncoiler, so that:
when Lss is larger than or equal to Lns, the unit enters a first speed reduction process, and the speed of the unit is reduced from V to Vc 1;
when Lss' is equal to or more than Lns, the speed of the unit enters a second speed reduction process, and the speed of the unit is reduced from Vc1 to Vc 2;
when Lss is greater than or equal to Lns, the speed of the unit is reduced to 0 from Vc2 in the third speed reduction process.
As an improvement of the invention, in the step 2, the remaining length of the strip steel on the uncoiler is determined; specifically, as follows, the following description will be given,
the step 2 realizes accurate positioning by an algorithm of optimizing the length Lns of the residual strip steel on the uncoiler;
the calculation of the residual length Lns of the strip steel on the uncoiler comprises that the core shaft of the uncoiler is wrapped by the strip steel, and the uncoiler is in a first stage of a tension state building stage (the number of turns of the strip steel is more than or equal to 2) and a second stage of a tension canceling stage (the number of turns of the strip steel is less than or equal to 1);
the method comprises the steps of calculating Lns the residual length of the strip steel on the uncoiler, wherein the key is to ensure the calculation accuracy of the diameter DP of the residual strip steel coil on the uncoiler, and a pulse ratio method is selected for calculation, so that when a unit normally operates, the uncoiler and the tension roller No. 1 are both in a tension building state, the wrapping gap of the steel coil on the uncoiler is small, the diameter of the residual steel coil on the uncoiler can be calculated in real time by using the pulse ratio method, and the calculation accuracy of the residual length is higher than that of the residual length calculated by using the number of rotation;
in the tension state building stage, the relationship among the residual length of the strip steel on the uncoiler, the diameter of a mandrel of the uncoiler, the diameter of the residual strip steel coil on the uncoiler and the average thickness value of the strip steel is as follows:
Figure BDA0002103746570000031
lns: the residual length of the strip steel on the uncoiler;
σ: a steel coil on the uncoiler wraps a gap factor (generally 1.0);
DOP: diameter of the core shaft of the uncoiler;
DP: the diameter of the residual strip steel coil on the uncoiler;
Figure BDA0002103746570000033
average thickness value of strip steel;
step 2, the diameter DP of the residual strip steel coil on the uncoiler is calculated by adopting a pulse ratio method, when the reel of the uncoiler rotates for 1/2 circles, the diameter DP of the steel coil can be calculated in real time according to the pulse ratio of the tension roller No. 1 and the uncoiler, and the measured real-time diameter DP of the steel coil is used for calculating the residual length Lns of the strip steel on the uncoiler;
the steel coil diameter DP, the diameter of the tension roller No. 1, the pulse accumulated value of the encoder on the uncoiler, the rotation of the tension roller No. 1 and the rotation of the uncoiler have the following gear ratio relationship:
Figure BDA0002103746570000032
DB: tension roll diameter No. 1;
Σ PB, Σ PP: the number 1 tension roller and the encoder pulse accumulated value on the uncoiler;
KB. KP: the gear ratio of the rotation of the No. 1 tension roller and the rotation of the uncoiler is higher than that of the No. 1 tension roller;
step 2, the number of turns of a steel coil on a winding drum of the uncoiler is less than or equal to 1, namely the tension canceling stage of the uncoiler, and the residual length of the strip steel cannot be calculated by a pulse ratio method when the uncoiler and the tension roller in the first stage are in tension building rotation, and at the moment, the residual length needs to be calculated by a coder for rotating the No. 1 tension roller alone;
the relationship among the residual length Lns of the strip steel on the uncoiler, the diameter of the mandrel of the uncoiler and the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled in the tension cancelling stage is as follows:
Lns＝π×DOP-∑PB'；
DOP: diameter of the core shaft of the uncoiler;
Σ PB': and the strip steel length corresponding to the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled.
As a modification of the present invention, the step 3: the accurate positioning of useless tape tail before two surely cut is as follows specifically:
1) the inlet section runs at a speed V during normal production of the unit, when the tail of a strip is required to be positioned to the double-shearing shear, the residual length of the strip steel on the uncoiler is required to be considered during tail-flicking positioning, the installation distance Loc from the uncoiler to the double-shearing shear and the shearing length Lc of waste materials are also required to be considered, a comparison variable Lns in the control of the graded speed reduction process is changed into Lns ', and the speed reduction point of the unit is determined by comparing Lns' with the sizes of graded speed reduction distances Lss, Lss 'and Lss';
2) calculating the residual length Lns' of the strip steel before double-cutting shearing;
the first step is as follows: the uncoiler is in the tension building stage, the number of turns of the residual steel coil on the uncoiler is more than or equal to 2, and the residual length Lns on the uncoiler is calculated by a pulse ratio method at the moment.
Figure BDA0002103746570000041
L'ns＝Lns+Loc-LC；
The second step is that: the uncoiler is in a tension disappearance stage, the number of turns of the residual steel coil on the uncoiler is less than or equal to 1 turn, and the residual length Lns on the uncoiler is calculated by adopting an algorithm of a No. 1 tension roller encoder which is independently used.
Lns＝π×DOP-∑PB'；
L'ns＝Lns+Loc-LC；
The third step: as an improvement of the algorithm, the raster sensor signal correction Lns' of the unit arranged between the uncoiler and the double-cutting channel is fully utilized to improve the accuracy of the number of the tail cutting knives. Because the waste material shearing length Lc is less than the installation distance Loc from the uncoiler to the double-shear, the technology utilizes the signal of the grating sensor in front of the straightener between the uncoiler and the double-shear to carry out positioning. The method is characterized in that a grating signal is in a shading state when a strip steel runs on a unit, the grating signal is in a light leakage state when in tail flicking, a pulse signal is generated at the moment, the value of the double-shearing shear at the tail distance of the strip is the installation distance Lph (fixed value) of the grating distance of the double-shearing shear, and the residual length is calculated as follows:
residual length of Lph-∑PB”；
L'ns＝Lph-∑PB”-LC
Lc: the length of the waste material cut;
and Lph: the distance between the front grating of the straightening machine and the double-shear is equal to the mounting distance of the double-shear;
Σ PB ": and the grating signal is changed from a shading state to the length of the strip steel corresponding to the accumulated value of the No. 1 tension roller encoder after light leakage.
Compared with the prior art, the invention has the advantages that 1) the technical scheme has simple, practical and accurate functions, can be debugged in place at one time, realizes the accurate positioning of the waste strip tail by optimizing and calculating the automatic speed reduction distance Lss and the strip steel residual length value Lns on the uncoiler, improves the yield and avoids the strip steel from escaping from the strip tail, 2) when the unit in the technical scheme is produced at a high speed of 500mpm, the system automatically sets the safety distance compensation value to be 6.37m, avoids the strip escaping from the strip tail caused by improper value, and has important significance in automatically carrying out safety distance compensation according to the running speed of the unit; 3) according to the technical scheme, a speed reduction scheme is set by a system, no matter how the running speed V of a unit changes, the speed is reduced to Vc1 firstly during automatic speed reduction, then tail-escaping positioning is carried out at a low speed Vc2, the same graded speed reduction scheme control can not only ensure that the automatic speed reduction function is realized and the tail-escaping phenomenon is avoided, but also can carry out unified compensation when the performance of equipment changes in the future so as to realize accurate speed reduction distance calculation; 4) according to the technical scheme, the length of the residual strip steel before the double-cutting shear is calculated by stages (the uncoiler tension establishing stage and the tension canceling stage), so that the shearing positioning precision is improved, and in addition, the technology has the following advantages: the positioning is accurate, and the shearing precision is controlled within 0.5 meter; the cutting length of the waste tape tail is controlled, and the unit yield is ensured; the strip tail shearing quality is controlled, and the re-welding processing time caused by the abnormal plate shape is reduced; and no escape with tail phenomenon occurs.
Drawings
FIG. 1 is a flow chart of a step-down process control
FIG. 2 is a schematic diagram of an automatic grading deceleration scheme of the unit
FIG. 3 pulse ratio method for calculating the diameter of the residual steel coil on the uncoiler
FIG. 4 is a flow chart of the control of the positioning of the tape tail to the double shear
Fig. 5 is an example view of the tape tail being positioned to the double shear.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1-5, a method for accurately positioning the tail of a cold-rolled steel strip includes the following steps:
step 1: determining a grading automatic deceleration point and a deceleration distance;
step 2: determining the residual length of the strip steel on the uncoiler;
and step 3: the accurate positioning of the waste tape tail before the double-cutting shear.
Step 1, determining a grading automatic deceleration point and a deceleration distance; specifically, the automatic speed reduction process of the unit is divided into the following 3 stages: a first segment of deceleration V → Vc1, a second segment of deceleration Vc1 → Vc2 and a third segment of deceleration Vc2 → 0, respectively;
the duration of Vc1 after the first stage deceleration is Tc1, and the calculated deceleration distance Lss is related as follows:
Figure BDA0002103746570000061
Ls＝V×TD+V×TS+Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
the duration of the second period of post-deceleration Vc2 is Tc2, and the calculated deceleration distance Lss' is as follows:
Figure BDA0002103746570000062
L's＝Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
and the speed of the third section of speed reduction unit is reduced to 0, so that the positioning of the belt tail is realized. The calculated deceleration distance Lss "is as follows:
Figure BDA0002103746570000063
L″s＝Vc2×TD+Vc2×TS；
in the formula:
lss, Lss', Lss ": calculating the deceleration distance in the first, second and third sections;
ls, Ls', Ls ": the safe distance compensation values of the first, second and third stages of speed reduction processes;
TD: the control system delays the response time (fixed value) by the automatic speed reduction command;
ts: the deceleration S-curve delay response time (fixed value);
v: the running speed of the unit;
vc1, Vc 2: a speed holding value (fixed value) at the time of automatic deceleration;
tc1, Tc 2: speed holding times (fixed values) of Vc1, Vc 2;
α: acceleration (a fixed value set according to the performance of unit equipment) when the unit accelerates and decelerates;
in conclusion, the automatic deceleration distances Lss, Lss 'and Lss' obtained by the calculation are compared with the remaining length value Lns of the strip steel on the uncoiler, so that:
when Lss is larger than or equal to Lns, the unit enters a first speed reduction process, and the speed of the unit is reduced from V to Vc 1;
when Lss' is equal to or more than Lns, the speed of the unit enters a second speed reduction process, and the speed of the unit is reduced from Vc1 to Vc 2;
when Lss is greater than or equal to Lns, the speed of the unit is reduced to 0 from Vc2 in the third speed reduction process.
Step 2, determining the residual length of the strip steel on the uncoiler; specifically, as follows, the following description will be given,
the step 2 realizes accurate positioning by an algorithm of optimizing the length Lns of the residual strip steel on the uncoiler;
the calculation of the residual length Lns of the strip steel on the uncoiler comprises that the core shaft of the uncoiler is wrapped by the strip steel, and the uncoiler is in a first stage of a tension state building stage (the number of turns of the strip steel is more than or equal to 2) and a second stage of a tension canceling stage (the number of turns of the strip steel is less than or equal to 1);
the method comprises the steps of calculating Lns the residual length of the strip steel on the uncoiler, wherein the key is to ensure the calculation accuracy of the diameter DP of the residual strip steel coil on the uncoiler, and a pulse ratio method is selected for calculation, so that when a unit normally operates, the uncoiler and the tension roller No. 1 are both in a tension building state, the wrapping gap of the steel coil on the uncoiler is small, the diameter of the residual steel coil on the uncoiler can be calculated in real time by using the pulse ratio method, and the calculation accuracy of the residual length is higher than that of the residual length calculated by using the number of rotation;
in the tension state building stage, the relationship among the residual length of the strip steel on the uncoiler, the diameter of a mandrel of the uncoiler, the diameter of the residual strip steel coil on the uncoiler and the average thickness value of the strip steel is as follows:
Figure BDA0002103746570000071
lns: the residual length of the strip steel on the uncoiler;
σ: a steel coil on the uncoiler wraps a gap factor (generally 1.0);
DOP: diameter of the core shaft of the uncoiler;
DP: the diameter of the residual strip steel coil on the uncoiler;
Figure BDA0002103746570000073
average thickness value of strip steel;
step 2, the diameter DP of the residual strip steel coil on the uncoiler is calculated by adopting a pulse ratio method, when the reel of the uncoiler rotates for 1/2 circles, the diameter DP of the steel coil can be calculated in real time according to the pulse ratio of the tension roller No. 1 and the uncoiler, and the measured real-time diameter DP of the steel coil is used for calculating the residual length Lns of the strip steel on the uncoiler;
the steel coil diameter DP, the diameter of the tension roller No. 1, the pulse accumulated value of the encoder on the uncoiler, the rotation of the tension roller No. 1 and the rotation of the uncoiler have the following gear ratio relationship:
Figure BDA0002103746570000072
DB: tension roll diameter No. 1;
Σ PB, Σ PP: the number 1 tension roller and the encoder pulse accumulated value on the uncoiler;
KB. KP: the gear ratio of the rotation of the No. 1 tension roller and the rotation of the uncoiler is higher than that of the No. 1 tension roller;
step 2, the number of turns of a steel coil on a winding drum of the uncoiler is less than or equal to 1, namely the tension canceling stage of the uncoiler, and the residual length of the strip steel cannot be calculated by a pulse ratio method when the uncoiler and the tension roller in the first stage are in tension building rotation, and at the moment, the residual length needs to be calculated by a coder for rotating the No. 1 tension roller alone;
the relationship among the residual length Lns of the strip steel on the uncoiler, the diameter of the mandrel of the uncoiler and the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled in the tension cancelling stage is as follows:
Lns＝π×DOP-∑PB'；
DOP: diameter of the core shaft of the uncoiler;
Σ PB': and the strip steel length corresponding to the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled.
The step 3: the accurate positioning of useless tape tail before two surely cut is as follows specifically:
1) the inlet section runs at a speed V during normal production of the unit, when the tail of a strip is required to be positioned to the double-shearing shear, the residual length of the strip steel on the uncoiler is required to be considered during tail-flicking positioning, the installation distance Loc from the uncoiler to the double-shearing shear and the shearing length Lc of waste materials are also required to be considered, a comparison variable Lns in the control of the graded speed reduction process is changed into Lns ', and the speed reduction point of the unit is determined by comparing Lns' with the sizes of graded speed reduction distances Lss, Lss 'and Lss';
2) calculating the residual length Lns' of the strip steel before double-cutting shearing;
the first step is as follows: the uncoiler is in the tension building stage, the number of turns of the residual steel coil on the uncoiler is more than or equal to 2, and the residual length Lns on the uncoiler is calculated by a pulse ratio method at the moment.
Figure BDA0002103746570000081
L'ns＝Lns+Loc-LC；
The second step is that: the uncoiler is in a tension disappearance stage, the number of turns of the residual steel coil on the uncoiler is less than or equal to 1 turn, and the residual length Lns on the uncoiler is calculated by adopting an algorithm of a No. 1 tension roller encoder which is independently used.
Lns＝π×DOP-∑PB'；
L'ns＝Lns+Loc-LC；
The third step: as an improvement of the algorithm, the raster sensor signal correction Lns' of the unit arranged between the uncoiler and the double-cutting channel is fully utilized to improve the accuracy of the number of the tail cutting knives. Because the waste material shearing length Lc is less than the installation distance Loc from the uncoiler to the double-shear, the technology utilizes the signal of the grating sensor in front of the straightener between the uncoiler and the double-shear to carry out positioning. The method is characterized in that a grating signal is in a shading state when a strip steel runs on a unit, the grating signal is in a light leakage state when in tail flicking, a pulse signal is generated at the moment, the value of the double-shearing shear at the tail distance of the strip is the installation distance Lph (fixed value) of the grating distance of the double-shearing shear, and the residual length is calculated as follows:
residual length of Lph-∑PB”；
L'ns＝Lph-∑PB”-LC
Lc: the length of the waste material cut;
and Lph: the distance between the front grating of the straightening machine and the double-shear is equal to the mounting distance of the double-shear;
Σ PB ": and the grating signal is changed from a shading state to the length of the strip steel corresponding to the accumulated value of the No. 1 tension roller encoder after light leakage. The application example is as follows: the example takes an acid continuous rolling unit of a certain 1420 cold rolling mill of Bao steel as an implementation object, and the same automatic grading speed reduction and double-cutting shear shearing positioning mode is adopted when the strip steel swings at the tail corresponding to strip steels with different specifications.
By taking a strip steel with the thickness of 2.0 mm, the width of 944 mm and the length of a steel coil of 1115 m as an example for explanation, the tail of the strip steel needs to be accurately positioned to the double-cutting shear. A method for realizing accurate positioning of the tail part of cold-rolled strip steel is carried out according to the following steps:
1) determining a grading automatic deceleration point and a deceleration distance;
referring to fig. 5, after the unit is running, the system starts to automatically calculate the stepped-down distances Lss, Lss', Lss ". The inlet section enters the high speed operation stage at a speed (V) of 500mpm (8.3 m/s). The Vc1 is set to be 60mpm (1 m/s), the Vc2 is set to be 30mpm (0.5 m/s) and the duration (Tc1) of the Vc1 after the first period of deceleration is 5 in the unit control systemSecond, the duration of Vc2 after the second ramp down (Tc2) is 5 seconds. The automatic deceleration command delay response Time (TD) of the unit control system is 0.15 second, the deceleration S curve delay response Time (TS) is 0.5 second, and the acceleration alpha is 0.65 m/S2。
Three sections of the automatic speed reduction process of the unit are as follows:
calculating the deceleration distance (Lss) to be 67.8m by the first segment of 500mpm → 60mpm for deceleration and running for 5 seconds at 60mpm, wherein the safe distance compensation value (Ls) is 6.37 m;
calculating the deceleration distance (Lss ') to be 4.25m by decelerating at a second stage of 60mpm → 30mpm and operating at 30mpm for 5 seconds, wherein the safe distance compensation value (Ls') is 0.975 m;
and the speed of the unit is reduced to 0 by the third section of 30mpm → 0, and the calculated deceleration distance (Lss ') is 0.52m, wherein the safety distance compensation value (Ls') is 0.325 m.
Because the unit is when producing with 500mpm high speed, safe distance compensation value is 6.37m, is far greater than waste material shearing length, consequently it is improper to set for safe distance compensation value and will directly appear escaping the tape trailer phenomenon, and control system carries out safe distance compensation according to unit functioning speed automatically and has important meaning. Meanwhile, the unit is controlled by the same grading speed reduction scheme, so that the automatic speed reduction function can be realized, the tail escaping phenomenon is avoided, and the unified compensation can be performed when the equipment performance changes in the future so as to realize accurate speed reduction distance calculation.
2) Determination of the remaining length of the strip on the uncoiler (optimization algorithm)
When the unit is operated, the system starts to optimally calculate the residual length Lns' from the strip steel to the double-cutting shear. The installation distance Loc from the uncoiler to the double-cutting shear is 13.9m, the reserved waste shearing length Lc before the double-cutting shear is 3 multiplied by 0.8 m, and the diameter DOP of a mandrel of the uncoiler is 743 mm.
In the tension building stage when the number of turns of the residual steel coil on the uncoiler is more than or equal to 2, the residual length Lns is calculated by a pulse ratio method, the diameter of the initial strip steel is 1842mm, the diameter of the uncoiled steel coil of the uncoiler is gradually reduced, for example, when the diameter DP of the steel coil calculated by the pulse ratio method is 1479mm, Lns is 642m, and the corresponding residual length before double cutting Lns' is 653.5 m.
And a tension disappearing stage that the number of turns of the residual steel coil on the uncoiler is less than or equal to 1 turn. When the tension disappears, the residual length Lns on the uncoiler is 2.33m, the corresponding residual length Lns ' before the double-shear is 13.83m, and after the tension disappears, the strip steel length sigma PB ' corresponding to the pulse accumulated value of the tension roller encoder No. 1 is independently used for calculating Lns ' in real time.
The strip tail leaves the uncoiler and moves towards the double-cutting direction. And 3, correcting Lns' by using a front grating signal of the straightener, wherein the straightener is arranged between the uncoiler and the double-cutting channel. The grating signal is in a shading state when strip steel runs on the unit, the grating signal is changed from the original shading state into a light leakage state when the strip steel swings, a pulse signal is generated at the moment, the value of the strip tail distance double-cutting shear is the installation distance Lph (fixed value, 10.7 meters) of the grating distance double-cutting shear, Lns ' is corrected to (10.7-2.4-8.3 meters) through the grating signal at the moment, and Lns ' is calculated in real time according to the strip steel length sigma PB ' corresponding to the pulse accumulated value of the tension roller encoder No. 1 after the grating light leakage.
3) Accurately positioning the waste tape tail before double-shearing;
and determining the speed reduction operation mode of the strip steel by comparing the residual length Lns ' of the strip steel before double cutting with the sizes of the grading speed reduction distances Lss (67.8m), Lss ' (4.25m) and Lss ' (0.52 m).
a. When Lns' is less than or equal to 67.8m, the unit enters the first speed reduction, the speed is reduced from 500mpm to 60mpm, and the unit is operated for 5s at 60 mpm.
b. When Lns' is less than or equal to 4.25m, the unit enters into secondary speed reduction, the speed is reduced from 60mpm to 30mpm, and the unit is operated for 5s at 30 mpm.
c. When Lns' is less than or equal to 0.52m, the unit enters the third speed reduction, the speed is reduced from 30mpm to 0, and the strip steel is positioned at the position of the shearing length Lc (3 multiplied by 0.8 m) before the double-cutting shear, so that the accurate positioning from the strip tail to the double-cutting shear is realized.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims (4)

1. A method for realizing accurate positioning of the tail of cold-rolled strip steel is characterized by comprising the following steps:
step 1: determining a grading automatic deceleration point and a deceleration distance;
step 2: determining the residual length of the strip steel on the uncoiler;
and step 3: the accurate positioning of the waste tape tail before the double-cutting shear.
2. The method for realizing the accurate positioning of the tail of the cold-rolled steel strip as claimed in claim 1, wherein the step 1 is the determination of the grading automatic deceleration point and the deceleration distance; specifically, as follows, the following description will be given,
the automatic speed reduction process of the unit is divided into the following 3 stages: a first segment of deceleration V → Vc1, a second segment of deceleration Vc1 → Vc2 and a third segment of deceleration Vc2 → 0, respectively;
the duration of Vc1 after the first stage deceleration is Tc1, and the calculated deceleration distance Lss is related as follows:
Figure FDA0002103746560000011
Ls＝V×TD+V×TS+Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
the duration of the second period of post-deceleration Vc2 is Tc2, and the calculated deceleration distance Lss' is as follows:
Figure FDA0002103746560000012
L's＝Vc1×TD+Vc1×TS+Vc2×TD+Vc2×TS；
and the speed of the third section of speed reduction unit is reduced to 0, so that the positioning of the belt tail is realized. The calculated deceleration distance Lss "is as follows:
Figure FDA0002103746560000013
L”s＝Vc2×TD+Vc2×TS；
in the formula:
lss, Lss', Lss ": calculating the deceleration distance in the first, second and third sections;
ls, Ls', Ls ": the safe distance compensation values of the first, second and third stages of speed reduction processes;
TD: the control system delays the response time according to the automatic speed reduction command;
ts: the response time of the speed reduction S curve is delayed;
v: the running speed of the unit;
vc1, Vc 2: maintaining the speed value during automatic deceleration;
tc1, Tc 2: speed retention time of Vc1, Vc 2;
α: acceleration of the unit during acceleration and deceleration;
in conclusion, the automatic deceleration distances Lss, Lss 'and Lss' obtained by the calculation are compared with the remaining length value Lns of the strip steel on the uncoiler, so that:
when Lss is larger than or equal to Lns, the unit enters a first speed reduction process, and the speed of the unit is reduced from V to Vc 1;
when Lss' is equal to or more than Lns, the speed of the unit enters a second speed reduction process, and the speed of the unit is reduced from Vc1 to Vc 2;
when Lss is greater than or equal to Lns, the speed of the unit is reduced to 0 from Vc2 in the third speed reduction process.
3. The method for realizing the accurate positioning of the tail part of the cold-rolled steel strip as claimed in claim 1, wherein in the step 2, the determination of the residual length of the steel strip on an uncoiler; specifically, as follows, the following description will be given,
the step 2 realizes accurate positioning by an algorithm of optimizing the length Lns of the residual strip steel on the uncoiler;
the calculation of the residual length Lns of the strip steel on the uncoiler comprises that the core shaft of the uncoiler is wrapped by the strip steel, and the uncoiler is in a first stage of a tension state building stage (the number of turns of the strip steel is more than or equal to 2) and a second stage of a tension canceling stage (the number of turns of the strip steel is less than or equal to 1);
the residual length of the strip steel on the uncoiler is calculated Lns, the uncoiler and the tension roller No. 1 are in a tension building state, the wrapping gap of the steel coil on the uncoiler is small, the diameter of the residual steel coil on the uncoiler can be calculated in real time by using a pulse ratio method, and the precision of the residual length calculated by using the number of rotation turns of the uncoiler is higher than that calculated by using the number of rotation turns of the uncoiler alone;
in the tension state building stage, the relationship among the residual length of the strip steel on the uncoiler, the diameter of a mandrel of the uncoiler, the diameter of the residual strip steel coil on the uncoiler and the average thickness value of the strip steel is as follows:
Figure FDA0002103746560000021
lns: the residual length of the strip steel on the uncoiler;
σ: a steel coil on the uncoiler wraps a gap factor;
DOP: diameter of the core shaft of the uncoiler;
DP: the diameter of the residual strip steel coil on the uncoiler;
Figure FDA0002103746560000022
: average thickness value of strip steel;
step 2, the diameter DP of the residual strip steel coil on the uncoiler is calculated by adopting a pulse ratio method, when the reel of the uncoiler rotates for 1/2 circles, the diameter DP of the steel coil can be calculated in real time according to the pulse ratio of the tension roller No. 1 and the uncoiler, and the measured real-time diameter DP of the steel coil is used for calculating the residual length Lns of the strip steel on the uncoiler;
the steel coil diameter DP, the diameter of the tension roller No. 1, the pulse accumulated value of the encoder on the uncoiler, the rotation of the tension roller No. 1 and the rotation of the uncoiler have the following gear ratio relationship:
Figure FDA0002103746560000031
DB: tension roll diameter No. 1;
Σ PB, Σ PP: the number 1 tension roller and the encoder pulse accumulated value on the uncoiler;
KB. KP: the gear ratio of the rotation of the No. 1 tension roller and the rotation of the uncoiler is higher than that of the No. 1 tension roller;
step 2, the number of turns of a steel coil on a winding drum of the uncoiler is less than or equal to 1, namely the tension canceling stage of the uncoiler, and the residual length of the strip steel cannot be calculated by a pulse ratio method when the uncoiler and the tension roller in the first stage are in tension building rotation, and at the moment, the residual length needs to be calculated by a coder for rotating the No. 1 tension roller alone;
the relationship among the residual length Lns of the strip steel on the uncoiler, the diameter of the mandrel of the uncoiler and the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled in the tension cancelling stage is as follows:
Lns＝π×DOP-∑PB'；
DOP: diameter of the core shaft of the uncoiler;
Σ PB': and the strip steel length corresponding to the accumulated value of the No. 1 tension roller encoder after the tension of the uncoiler is cancelled.
4. The method for accurately positioning the tail of the cold-rolled steel strip as claimed in claim 3, wherein the step 3: the accurate positioning of useless tape tail before two surely cut is as follows specifically:
1) the inlet section runs at a speed V during normal production of the unit, when the tail of a strip is required to be positioned to the double-shearing shear, the residual length of the strip steel on the uncoiler is required to be considered during tail-flicking positioning, the installation distance Loc from the uncoiler to the double-shearing shear and the shearing length Lc of waste materials are also required to be considered, a comparison variable Lns in the control of the graded speed reduction process is changed into Lns ', and the speed reduction point of the unit is determined by comparing Lns' with the sizes of graded speed reduction distances Lss, Lss 'and Lss';
2) calculating the residual length Lns' of the strip steel before double-cutting shearing;
the first step is as follows: the uncoiler is in a tension building stage, the number of turns of the residual steel coil on the uncoiler is more than or equal to 2, and the residual length Lns on the uncoiler is calculated by a pulse ratio method;
Figure FDA0002103746560000032
L'ns＝Lns+Loc-LC；
the second step is that: the uncoiler is in a tension disappearance stage, the number of turns of the residual steel coil on the uncoiler is less than or equal to 1 turn, and the residual length Lns on the uncoiler is calculated by adopting an algorithm of a No. 1 tension roller encoder which is independently used.
Lns＝π×DOP-∑PB'；
L'ns＝Lns+Loc-LC；
The third step: when the grating signal is changed into a light leakage state during tail flicking, a pulse signal is generated at the moment, the value of the double-shear with the tail distance is the installation distance Lph of the double-shear with the grating distance, and the residual length is calculated as follows:
residual length of Lph-∑PB”；
L'ns＝Lph-∑PB”-LC
Lc: the length of the waste material cut;
and Lph: the distance between the front grating of the straightening machine and the double-shear is equal to the mounting distance of the double-shear;
Σ PB ": and the grating signal is changed from a shading state to the length of the strip steel corresponding to the accumulated value of the No. 1 tension roller encoder after light leakage.
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