CN112191693A - Method for cutting waste at tail of uncoiler of cold-rolled sheet processing line - Google Patents
Method for cutting waste at tail of uncoiler of cold-rolled sheet processing line Download PDFInfo
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- CN112191693A CN112191693A CN202011227742.XA CN202011227742A CN112191693A CN 112191693 A CN112191693 A CN 112191693A CN 202011227742 A CN202011227742 A CN 202011227742A CN 112191693 A CN112191693 A CN 112191693A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 88
- 239000002699 waste material Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000010008 shearing Methods 0.000 claims abstract description 45
- 241001061132 Eutaeniophorus sp. 033-Miya Species 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000011282 treatment Methods 0.000 abstract description 6
- 241000873497 Parataeniophorus brevis Species 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- 238000003672 processing method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/28—Associations of cutting devices therewith
Abstract
The invention relates to a strip tail waste cutting method of an uncoiler of a cold-rolled sheet processing line, belonging to the technical field of metallurgy automatic control.A strip tail waste cutting length is set according to the uncoiler, the method is divided into a short strip tail processing flow and a long strip tail processing flow, and the short strip tail is subjected to grating detection and strip tail stopping positioning triggering to complete shearing; and triggering the stopping and positioning of the belt tail to finish shearing by adopting a method combining the steps of pressing a measuring roller against the long belt tail to measure the coil diameter of the uncoiler, calculating the belt tail length of the uncoiler by the measuring roller and calculating the belt tail length based on the coil diameter of the uncoiler. Different treatments are carried out on the long and short tape tails, so that more time is not spent on the short tape tail, the shearing efficiency is ensured, and the shearing accuracy of the tape tail is also ensured; the long strip tail is calculated based on different calculation modes, the influence of the calculation fluctuation of the diameter of the uncoiler on the shearing length precision of the strip tail is solved, the shearing precision and stability of the strip tail are improved, and the aims of improving the product yield and the product quality are finally achieved.
Description
Technical Field
The invention relates to the technical field of metallurgical automatic control, in particular to a method for cutting waste at the tail of an uncoiler of a cold-rolled sheet processing line.
Background
The uncoiler of the cold-rolled sheet processing line is used for uncoiling and feeding raw material coils and continuously conveying strip steel to a production line. Due to the production process of the cold-rolled sheet, the head and the tail of the raw material coil strip steel are provided with a section of strip steel, and the strip steel is required to be sheared if the product quality does not meet the requirement. The cut length of the tail (residual strip) of the steel coil on the uncoiler is usually calculated based on the coil diameter of the uncoiler.
Because factors such as the tension of the uncoiler, the speed control precision of the uncoiler and the reference roller directly influence the calculation precision and stability of the coil diameter of the uncoiler, the coil diameter calculation may have large fluctuation under the working conditions of frequent acceleration and deceleration and the like, and the band tail length calculated based on the coil diameter of the uncoiler also has large fluctuation.
In order to ensure the product quality, the strip steel with unqualified head and tail of the raw material coil must be cut off, and under the condition that the calculation precision and the stability of the strip tail length of the uncoiler cannot be completely ensured, an operator can generally ensure that the strip steel with unqualified tail is completely cut to be waste by increasing the strip tail cutting length. Even so, occasionally, the problem of excessively long and short tail shearing caused by large calculation fluctuation of the tail length can be caused, the production yield and the product quality are influenced, and the waste of the strip steel can be caused.
Through search, the Chinese patent application No. 2020106141174, the invention and creation name is: a tape tail slitting positioning control method is disclosed as follows: the invention discloses a strip tail slitting and positioning control method in the year 2020, month 10 and 23.A strip tail is continuously conveyed by a pinch roll before shearing, and the slitting shear is controlled to continuously shear the strip tail by a set strip tail cutting length S0; in the shearing process, when the length of the residual tape tail reaches the set initial length L0 of the tape tail waste, starting to obtain the conveying length L1 of the tape tail, and calculating the residual length L2 of the tape tail and the residual shearing frequency N; when the residual shearing frequency N is less than or equal to N, pre-controlling and adjusting the cutting length of the tape tail, and shearing the tape tail by the adjusted cutting length of the tape tail through the slitting shear; and when the calculated residual shearing frequency N is equal to 0, or no strip steel passes through the pinch roll before the shear, the pinch roll before the shear is opened, and the strip tail is cut. The tape tail slitting and positioning control method provided by the application can effectively reduce the incidence rate of steel remaining or steel clamping accidents during tail crushing, but the tape tail slitting and positioning control method provided by the application adopts a conventional tape tail residual length calculation mode, is easily influenced by working conditions such as acceleration and deceleration and the like, and leads to unsatisfactory slitting results.
Disclosure of Invention
1. Technical problem to be solved by the invention
In order to solve the influence of the calculation fluctuation of the coil diameter of the uncoiler on the band tail shearing length precision, the invention provides a band tail waste cutting control method of the uncoiler of a cold-rolled sheet processing line.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a method for cutting waste of a strip tail of an uncoiler of a cold-rolled sheet processing line, which comprises the steps of firstly setting the waste cutting length of the strip tail according to the uncoiler, dividing the waste cutting length into a short strip tail processing flow and a long strip tail processing flow, detecting the short strip tail by a grating, triggering the stopping and positioning of the strip tail to finish cutting, pressing a measuring roller against the long strip tail to measure the coil diameter of the uncoiler, calculating the strip tail length of the uncoiler by the measuring roller, and triggering the stopping and positioning of the strip tail to finish cutting in a combined mode of calculating the strip tail length based on the coil diameter of the.
Furthermore, the method comprises the following steps:
step one, calculating the residual length L1 of the belt tail on the uncoiler based on the coil diameter of the uncoiler, and judging the set length L of the waste cutting of the belt tailCLAnd LSCIf the length L is setCL<LSCThen go to step two, if the length L is setCL≥LSCEntering the third step;
wherein L1 is real timeCalculated value, LSCIs a comparison value of the mode selection of the waste strip steel cutting of the strip tail of the uncoiler, LSC＝LCD-LDD，LCDDistance of grating to entry shear, LDDFor the deceleration distance of the strip steel, LDD＝V1t-0.5at^2A is acceleration, V1The tail flicking speed of the uncoiler;
setting a short strip tail waste cutting mark on the strip steel, detecting the short strip tail by adopting a grating, and triggering the strip tail to stop and position to finish cutting;
step three, setting a long strip tail waste cutting mark on the strip steel, enabling the uncoiler to decelerate and press against a measuring roller, and calculating the measured coil diameter DmComparison of the measured coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf so, go to step five, DdIs a set value;
step four, triggering the stopping and positioning of the belt tail, wherein the residual length of the belt tail on the uncoiler is L1, when the residual length is L1<LCWhen the tape tail is cut, the tape tail stop positioning processing is switched to the mode that the tape tail residual length is calculated by using an inlet speed reference roller encoder to position and finish the shearing;
wherein L isCThe minimum remaining strip length for which tension can be maintained for the uncoiler;
step five, adjusting tension, lifting the measuring roller, and calculating the measured roll diameter DmComparison of the measured coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf yes, entering the step six;
and step six, the belt tail stop positioning processing is switched to the mode that the belt tail residual length is calculated by using an inlet speed reference roller encoder to position and finish the shearing.
Furthermore, after the short strip tail waste cutting mark is set in the step two, a short strip tail waste cutting deceleration point L is set firstly21When the tape tail residual length L1 on the uncoiler<L21When the production line speed is reduced to the tail-flicking speed V, the uncoiler is decelerated1When the grating I is detected to leave the strip tail, the length of the strip tail is corrected to be LCD(ii) a Then, the user can use the device to perform the operation,setting the positioning length L of the belt tails1And positioning the tail of the strip steel, cutting waste of the strip tail when the cutting positioning of the strip tail is finished, and cutting waste of the short strip tail when the grating II detects that no strip steel exists and the cutting of the strip tail is finished;
wherein L is21I.e. the residual length L of the uncoiler when the short tail shearing starts to decelerate21＝LCL-LAD+LF1,LCLSetting the length, L, for cutting waste at the tail of the uncoilerADDistance from uncoiler to entry shear, LF1Is an offset;
Ls1i.e. the short belt tail stopping distance of the uncoiler, Ls1＝LCD-LCL。
Furthermore, after the long-length belt tail waste cutting mark is set in the third step, a long-length belt tail waste cutting speed reducing point L is set firstly22When the tape tail residual length L1 on the uncoiler<L22When the production line speed is reduced to the tail-flicking speed V, the uncoiler is decelerated1While pressing against the measuring roller, the roll diameter D is calculated and measuredm(ii) a Then comparing and measuring the coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf yes, entering the step five;
wherein L is22I.e. the remaining length, L, of the decoiler at the beginning of deceleration of the long tail22＝LCL-LAD+LF2，LF2Is an offset.
Furthermore, the positioning length L of the belt tail is firstly set in the fourth steps2The belt tail stop positioning is carried out according to the calculated belt tail length of the uncoiler according to the coil diameter, and when the belt tail residual length L1 on the uncoiler<LCWhen the strip tail of the uncoiler stops positioning, the strip tail residual length is calculated by using an inlet speed reference roller encoder; when the positioning of the strip tail is finished and the speed of the production line is reduced to 0, cutting waste of the strip tail is cut, and when the grating II detects that no strip steel exists and the cutting of the strip tail is finished, the cutting of the strip tail in the process is finished;
wherein L iss2I.e. the parking distance, L, of the long tail of the uncoilers2＝Lr+LAD-LCL，LrLength of remaining strip steel on uncoiler for carrying out strip tail parking。
Further, step five is to increase the start-up tension by 10% (which can be set) first, and then to use the D calculated by the measuring rollermCorrecting the roll diameter and calculating the roll diameter DC(ii) a After the tension adjustment is completed, the measured coil diameter D is compared againmCalculating the roll diameter D from the roll diameterCAnd lifting the measuring roller when the deviation occurs<DdIf so, entering the step four, and if the deviation is more than or equal to DdAnd if so, entering the step six.
Further, the sixth step is specifically that the strip tail stop positioning processing of the uncoiler is switched to utilize an inlet speed reference roller encoder to calculate the residual length of the strip tail; and when the strip tail positioning is finished and the production line speed is reduced to 0, cutting waste of the strip tail, and when the grating II detects that no strip steel exists and the cutting of the strip tail is finished, cutting waste of the strip tail in the process is finished.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention discloses a strip tail waste cutting control method of an uncoiler of a cold-rolled sheet processing line, which combines the steps of pressing by a measuring roller, measuring the coil diameter of the uncoiler, calculating the strip tail length of the uncoiler by the measuring roller and calculating the strip tail length based on the coil diameter of the uncoiler, solves the influence of the calculation fluctuation of the coil diameter of the uncoiler on the shearing length precision of the strip tail, improves the shearing precision and stability of the strip tail, and finally realizes the aim of improving the product yield and the product quality.
(2) According to the method for cutting the strip tail of the uncoiler of the cold-rolled sheet processing line, the strip tail is divided into a long strip tail and a short strip tail for processing, correction is carried out in the process of processing the short strip tail, then shearing is carried out, the shearing accuracy is ensured, and the processing process is quicker; when the long strip tail is processed, a processing method of pressing and lifting a measuring roller is adopted, the strip tail length of an uncoiler is calculated by comparing the measuring roller in the process, the deviation of the strip tail length is calculated based on the coil diameter of the uncoiler, and the accuracy of shearing the strip tail is ensured by adopting a corresponding subsequent processing method; aiming at different treatments of the long and short band tails, compared with the method that the same treatment means is adopted for various band tails in the prior art, the method does not need to shorten the time spent on the band tail, thereby ensuring the shearing efficiency and the shearing accuracy of the band tail.
(3) According to the method for cutting the waste of the strip tail of the uncoiler of the cold-rolled sheet processing line, the strip tail cutting length is set according to the uncoiler, a strip steel detection grating is arranged to trigger strip tail parking shearing and a strip tail parking shearing mode is calculated and triggered based on the residual strip steel length of the uncoiler, and different triggering modes are adopted to ensure accurate shearing; after the scrap cutting and speed reduction of the belt tail, pressing down a measuring wheel, and correcting the uncoiler to calculate the coil diameter by actually measuring the linear speed of the uncoiler; when the strip steel on the uncoiler is smaller than the set number of turns, the strip tail residual length of the uncoiler is switched to the strip steel length calculation based on the inlet speed reference roller from the uncoiler coil diameter calculation, and the calculation is carried out according to the actual condition, so that the shearing result is more accurate.
Drawings
FIG. 1 is a schematic view of a tail cutting device of an uncoiler of a cold-rolled sheet processing line according to the present invention;
FIG. 2 is a control flow chart of the method for cutting waste at the tail of the uncoiler of the cold-rolled sheet processing line.
Number designations in the schematic drawings illustrate that:
1. an uncoiler; 2. a measuring roller; 3. an encoder; 4. an inlet pinch roll; 5. a first grating; 6. a head straightening machine; 7. a pinch roll before shearing; 8. a second grating; 9. shearing an inlet; 10. a tension roller; 11. strip steel.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
Referring to fig. 1, in the method for cutting waste at the tail of the uncoiler of the cold-rolled sheet processing line, the strip steel 11 winds around the uncoiler 1, sequentially passes through the inlet pinch roll 4, the straight head machine 6 and the pinch roll 7 before cutting, is tensioned by the tensioning roll 10, is pressed by the measuring roll, measures the coil diameter of the uncoiler, calculates the length of the tail of the uncoiler based on the measuring roll, and controls the cutting waste at the tail of the strip steel 11 by the method combining the calculation of the length of the tail based on the coil diameter of the uncoiler, and the specific process is as follows:
step one, calculating the residual length L1 of the belt tail on the uncoiler 1 based on the coil diameter of the uncoiler, and judging the waste cutting set length L of the belt tail of the uncoilerCLAnd LSCIf the length L is setCL<LSCThen go to step two, if the length L is setCL≥LSCThen go to step three.
Wherein L1 is a variation value, and the residual length of the belt tail on the uncoiler 1 is always calculated in real time in the running process;
the strip steel at the head part and the tail part of the strip steel 11 of the cold rolling processing line usually does not meet the quality standard and needs to be cut off, and the strip tail of the uncoiler is cut to be waste to set the length LCLThe specific length of (a) is set by an operator according to production conditions;
LSCis a comparison value for selecting a mode of cutting waste strip steel at the tail of an uncoiler, specifically, LSC＝LCD-LDD，LCDDistance of grating 5 to entry shear 9, LDDFor the deceleration distance, L, of the strip 11DD＝V1t-0.5at^2A is acceleration, usually 0.5m/min2，V1The tail flick speed V of the uncoiler is the tail flick speed of the uncoiler1The concentration was set at 30 m/min.
Step two, setting a short strip tail waste cutting mark on the strip steel 11, and firstly setting a short strip tail waste cutting deceleration point L21When the tape tail residual length L1 on the uncoiler 1<L21When the production line speed is reduced to the tail-flicking speed V, the uncoiler 1 is decelerated1When the grating I5 is detected to leave the strip tail, the length of the strip tail is corrected to be LCD；
Then, the tape tail positioning length L is sets1And the tail part of the strip steel 11 is positioned, when the strip tail shearing positioning is finished, the strip tail waste cutting shearing is carried out, and when the grating II 8 detects that no strip steel exists and the strip tail shearing is finished, the short strip tail waste cutting is finished.
L21I.e. the residual length L of the uncoiler when the short tail shearing starts to decelerate21＝LCL-LAD+LF1,LCLSetting the length, L, for cutting waste at the tail of the uncoilerADDistance, L, from uncoiler 1 to entry shear 9F1For the offset, the offset can be set, in this embodiment to 10 meters;
Ls1i.e. the short belt tail stopping distance of the uncoiler, Ls1＝LCD-LCL。
Step three, setting a long strip tail waste cutting mark on the strip steel 11, and firstly setting a long strip tail waste cutting speed reducing point L22When the tape tail residual length L1 on the uncoiler 1<L22When the production line speed is reduced to the tail-flicking speed V, the uncoiler 1 is decelerated1While pressing against the measuring roller 2, the measured winding diameter D is calculatedm；
Then comparing and measuring the coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdAnd if so, entering the step five.
Wherein L is22I.e. the remaining length, L, of the decoiler at the beginning of deceleration of the long tail22＝LCL-LAD+LF2LF2 is offset: for measuring the coil diameter with the measuring roll 2 pressed against the unwinder 1, the offset value can be set, in this embodiment to 25 meters;
measuring the coil diameter DmCalculating the roll diameter D from the roll diameterCThe calculated roll diameter is more accurate, so the calculation is performed by pressing against the measuring roll 2, normally the roll diameter D is measuredmCalculating the roll diameter D from the roll diameterCShould be of similar magnitude, the deviation value is a small value, and the deviation value is compared with DdComparing, determining the corresponding mode of the subsequent treatment, DdFor constant value, take D in this exampled＝0.1；
Roll diameter D is calculated to roll diameterC: calculating the uncoiling diameter of the uncoiler for the uncoiling diameter of the production line, namely calculating the speed of the uncoiler and the speed of an on-line speed reference roller;
measuring the coil diameter DmIs the diameter of the coil of the uncoiler calculated by the measuring roller 2, specifically: after the measuring roller 2 is pressed against the uncoiler 1, the rotating speed n of the measuring roller is detected by an encoder II 3cThrough ncCalculating the linear velocity V of the measuring rollerC＝ΠDC1×nc，D C1For measuring the roll diameter: typically 100 mm; then the roll diameter D is calculated in real timek＝(VC×ik)/(Π×nk)，ikFor the gear ratio of the unwinder, nkThe actual speed of the uncoiler (motor speed) is measured and the coil diameter D is measuredmI.e. through DkAverage coil diameter obtained at 1 second (settable) calculation intervals.
Step four, setting the positioning length L of the belt tails2The belt tail stop positioning is carried out according to the calculated belt tail length of the uncoiler according to the coil diameter, and when the belt tail residual length L1 on the uncoiler<LCWhen the strip tail of the uncoiler stops positioning, the strip tail residual length is calculated by using an inlet speed reference roller encoder (namely, the encoder 3); and when the strip tail positioning is finished and the production line speed is reduced to 0, cutting waste of the strip tail is cut, and when the grating II 8 detects that no strip steel 11 exists and the cutting of the strip tail is finished, finishing the cutting of the long strip tail in the process.
Wherein L isCThe minimum remaining strip length for which the uncoiler 1 can maintain tension can be set, in this example to the strip length of the last 3 coils;
Ls2i.e. the parking distance, L, of the long tail of the uncoilers2＝Lr+LAD-LCL，LrFor the length of the remaining strip on the uncoiler 1 when the strip tail is parked。
Step five, increasing the starting tension by 10 percent (can be set), and then calculating D by using the measuring rollermCorrecting the roll diameter and calculating the roll diameter DC(in this case, D ism＝DC) (ii) a After the tension adjustment is completed, the measured coil diameter D is compared againmCalculating the roll diameter D from the roll diameterCAnd lifting the measuring roller 2 when the deviation occurs<DdIf so, entering the step four, and if the deviation is more than or equal to DdAnd if so, entering the step six.
Sixthly, switching the belt tail stop positioning processing of the uncoiler into the calculation of the residual length of the belt tail by utilizing an inlet speed reference roller encoder (namely, an encoder 3); and when the strip tail positioning is finished and the production line speed is reduced to 0, cutting waste of the strip tail is cut, and when the grating II 8 detects that no strip steel 11 exists and the cutting of the strip tail is finished, finishing the cutting of the long strip tail in the process.
In the embodiment, the strip tail is divided into a long strip tail and a short strip tail for processing, correction is carried out in the process of processing the short strip tail, then shearing is carried out, the shearing accuracy is ensured, and the processing process is quicker; when the long belt tail is processed, a processing method of pressing and lifting the measuring roller 2 is adopted, the measuring roller is compared to calculate the coil diameter of the uncoiler in the process, the deviation of the coil diameter is calculated based on the coil diameter of the uncoiler, and a corresponding subsequent processing method is adopted to ensure the accuracy of shearing the belt tail; in addition, different treatments are carried out on the long and short tape tails, compared with the situation that the same treatment means is adopted for various tape tails in the prior art, the tape tail shearing method does not need to shorten more time on the tape tail, and therefore the shearing efficiency is guaranteed, and the accuracy of tape tail shearing is guaranteed; the influence of the calculation fluctuation of the coil diameter of the uncoiler on the shearing length precision of the strip tail is solved, the shearing precision and stability of the strip tail are improved, and the aims of improving the product yield and the product quality are finally achieved.
The control method and the corresponding control method flow chart provided by the embodiment are converted into a control program through a programming language of a hardware platform such as a PLC (programmable logic controller) and the like, so that the strip tail cutting control function of the uncoiler of the cold-rolled sheet processing line with high precision and high stability can be realized, and the automatic strip tail cutting is realized.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (7)
1. A method for cutting waste at the tail of a cold-rolled sheet processing line uncoiler is characterized by comprising the following steps: the method comprises the steps of firstly setting waste cutting length of the belt tail according to an uncoiler, dividing the waste cutting length into a short belt tail processing flow and a long belt tail processing flow, detecting the short belt tail by a grating, triggering stopping and positioning of the belt tail to finish cutting, pressing a measuring roller against the long belt tail to measure the coil diameter of the uncoiler, calculating the length of the belt tail of the uncoiler by the measuring roller, and triggering stopping and positioning of the belt tail to finish cutting in a mode of combining the coil diameter of the uncoiler and the length of the belt tail.
2. The method for cutting the tail of the uncoiler strip in the cold-rolled sheet processing line according to claim 1, which comprises the following steps:
step one, calculating the residual length L1 of the belt tail on the uncoiler based on the coil diameter of the uncoiler, and judging the set length L of the waste cutting of the belt tailCLAnd LSCIf the length L is setCL<LSCThen go to step two, if the length L is setCL≥LSCEntering the third step;
wherein L1 is a real-time calculation value, LSCIs a comparison value of the mode selection of the waste strip steel cutting of the strip tail of the uncoiler, LSC＝LCD-LDD，LCDDistance of grating to entry shear, LDDFor the deceleration distance of the strip steel, LDD＝V1t-0.5at^2A is acceleration, V1The tail flicking speed of the uncoiler;
setting a short strip tail waste cutting mark on the strip steel, detecting the short strip tail by adopting a grating, and triggering the strip tail to stop and position to finish cutting;
step three, setting a long strip tail waste cutting mark on the strip steel, enabling the uncoiler to decelerate and press against a measuring roller, and calculating the measured coil diameter DmComparison of the measured coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf so, go to step five, DdIs a set value;
step four, triggering the stopping and positioning of the belt tail, wherein the residual length of the belt tail on the uncoiler is L1, when the residual length is L1<LCWhen the tape tail is cut, the tape tail stop positioning processing is switched to the mode that the tape tail residual length is calculated by using an inlet speed reference roller encoder to position and finish the shearing;
wherein L isCThe minimum remaining strip length for which tension can be maintained for the uncoiler;
step five, adjusting tension, lifting the measuring roller and calculating a measuring rollDiameter DmComparison of the measured coil diameter DmCalculating the roll diameter D from the roll diameterCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf yes, entering the step six;
and step six, the belt tail stop positioning processing is switched to the mode that the belt tail residual length is calculated by using an inlet speed reference roller encoder to position and finish the shearing.
3. The method of claim 2, wherein the strip tail of the uncoiler of the cold-rolled sheet processing line is cut into waste, and the method comprises the following steps: setting a short strip tail waste cutting mark in the second step, and firstly setting a short strip tail waste cutting deceleration point L21When the tape tail residual length L1 on the uncoiler<L21When the production line speed is reduced to the tail-flicking speed V, the uncoiler is decelerated1When the grating I is detected to leave the strip tail, the length of the strip tail is corrected to be LCD(ii) a Then, the tape tail positioning length L is sets1And positioning the tail of the strip steel, cutting waste of the strip tail when the cutting positioning of the strip tail is finished, and cutting waste of the short strip tail when the grating II detects that no strip steel exists and the cutting of the strip tail is finished;
wherein L is21I.e. the residual length L of the uncoiler when the short tail shearing starts to decelerate21＝LCL-LAD+LF1,LCLSetting the length, L, for cutting waste at the tail of the uncoilerADDistance from uncoiler to entry shear, LF1Is an offset;
Ls1i.e. the short belt tail stopping distance of the uncoiler, Ls1＝LCD-LCL。
4. The method of claim 3, wherein the strip tail of the uncoiler of the cold-rolled sheet processing line is cut into waste, and the method comprises the following steps: after the long-length belt tail waste cutting mark is set in the third step, a long-length belt tail waste cutting speed reducing point L is set firstly22When the tape tail residual length L1 on the uncoiler<L22When the production line speed is reduced to the tail-flicking speed V, the uncoiler is decelerated1While pressing against the measuring roller, the roll diameter D is calculated and measuredm(ii) a Then comparing and measuring the coil diameter DmAnd roll diameter calculationCoil diameter DCWhen deviation of<DdIf so, entering the step four, and if the deviation is more than or equal to DdIf yes, entering the step five;
wherein L is22I.e. the remaining length, L, of the decoiler at the beginning of deceleration of the long tail22＝LCL-LAD+LF2，LF2Is an offset.
5. The method of claim 4, wherein the strip tail of the uncoiler of the cold-rolled sheet processing line is cut into waste, and the method comprises the following steps: step four, firstly setting the positioning length L of the belt tails2The belt tail stop positioning is carried out according to the calculated belt tail length of the uncoiler according to the coil diameter, and when the belt tail residual length L1 on the uncoiler<LCWhen the strip tail of the uncoiler stops positioning, the strip tail residual length is calculated by using an inlet speed reference roller encoder; when the positioning of the strip tail is finished and the speed of the production line is reduced to 0, cutting waste of the strip tail is cut, and when the grating II detects that no strip steel exists and the cutting of the strip tail is finished, the cutting of the strip tail in the process is finished;
wherein L iss2I.e. the parking distance, L, of the long tail of the uncoilers2＝Lr+LAD-LCL，LrLength of remaining strip steel on uncoiler for carrying out strip tail parking。
6. The method of claim 5, wherein the strip tail of the uncoiler of the cold-rolled sheet processing line is cut into waste, and the method comprises the following steps: step five, increasing the starting tension by 10 percent (can be set), and then calculating D by using the measuring rollermCorrecting the roll diameter and calculating the roll diameter DC(ii) a After the tension adjustment is completed, the measured coil diameter D is compared againmCalculating the roll diameter D from the roll diameterCAnd lifting the measuring roller when the deviation occurs<DdIf so, entering the step four, and if the deviation is more than or equal to DdAnd if so, entering the step six.
7. The method of claim 6, wherein the strip tail of the uncoiler of the cold-rolled sheet processing line is cut into waste, and the method comprises the following steps: step six, specifically, the uncoiler strip tail stop positioning processing is switched to utilize an inlet speed reference roller encoder to calculate the strip tail residual length; and when the strip tail positioning is finished and the production line speed is reduced to 0, cutting waste of the strip tail, and when the grating II detects that no strip steel exists and the cutting of the strip tail is finished, cutting waste of the strip tail in the process is finished.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112978510A (en) * | 2021-02-08 | 2021-06-18 | 中铝瑞闽股份有限公司 | Automatic parking device with tail and control method |
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| JPH09122719A (en) * | 1995-10-31 | 1997-05-13 | Nisshin Steel Co Ltd | Method for tracking tail end of strip |
| KR19990001794A (en) * | 1997-06-17 | 1999-01-15 | 김종진 | Control method of automatic stop of strip end of hot rolled winding machine |
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