CN112222202B - Control method for tension switching of strip steel welding line over-leveling equipment - Google Patents
Control method for tension switching of strip steel welding line over-leveling equipment Download PDFInfo
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- CN112222202B CN112222202B CN201910581970.8A CN201910581970A CN112222202B CN 112222202 B CN112222202 B CN 112222202B CN 201910581970 A CN201910581970 A CN 201910581970A CN 112222202 B CN112222202 B CN 112222202B
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- B21B37/48—Tension control; Compression control
Abstract
A control method for tension switching of strip steel weld over-flattening equipment belongs to the field of metal rolling. Firstly, establishing a tension amplitude limiting model taking the sectional area of the current coiled steel strip as an independent variable; judging whether any threshold value of an inlet tension switching threshold value or an outlet tension switching threshold value of the temper mill is smaller than a tension switching threshold value or not; if not, the tension switching of the temper mill adopts a 'B point instantaneous switching mode' to carry out automatic switching control; if yes, continuously judging whether the tension set value of the current strip steel roll is smaller than the tension set value of the next strip steel roll; if yes, the tension of the temper mill is switched by adopting an A-B interval switching mode to carry out automatic switching control; if not, the tension of the temper mill is switched and automatically switched and controlled by adopting a B-C interval switching mode. The tension control device improves the yield of the unit, reduces the labor intensity of operators, and can be widely applied to the field of tension control when the strip steel welding line passes through the leveling equipment in the rolling process.
Description
Technical Field
The invention belongs to the field of metal rolling, and particularly relates to a tension control method for a strip steel welding seam passing through a leveling device in a rolling process.
Background
The leveling equipment is one of key equipment for realizing high surface quality of the strip steel, and one important leveling process index is that after a strip steel welding line passes through the leveling equipment, the length requirement of the strip steel with inconsistent extension rates of the front and the back of the strip steel welding line is less than 6 meters so as to ensure that the product yield of a unit meets the process requirement.
FIG. 1 is a schematic process diagram of a leveling apparatus. The leveling device of the cold rolling hot galvanizing unit comprises a 6# tension roller 1 positioned in front of main equipment (from right to left in the figure when viewed along the running direction of a strip steel), an inlet tension measuring roller 2, a first steering roller 3, a main equipment roller group (comprising a supporting roller 5 and a working roller 6) with roller shapes of crease-resistant rollers 4 and 4, a breaking-resistant roller 7 positioned behind the main equipment, a second steering roller 8, an outlet tension measuring roller 9 and a 7# tension roller 10, a tension meter (not shown in the figure) connected with each tension measuring roller, a rolling line adjusting system 11 and the like.
In the traditional control technology, when a strip steel welding seam (welding seam for short) passes through a leveling device, an instant tension switching control mode is usually adopted, and the control mode has the following problems in the actual use process:
1. when the strip steel welding seam passes through the leveling equipment, the control mode is switched by adopting single instant tension. Because a tension amplitude limiting model with the strip steel sectional area as an independent variable is not constructed, after a thin-material soft steel welding seam passes through a temper mill, the strip is broken due to improper tension setting, and the stable operation of a unit is influenced to a certain extent.
2. When the welding line passes through the leveling equipment, the control mode is switched by adopting single instant tension. Because the influence of the change value of the tension switching of the strip steel before and after the welding line on the elongation rate is not considered, the length of the strip steel with the inconsistent elongation rate before and after the welding line of the strip steel can reach about 12 meters, and the yield of a unit is influenced to a certain extent.
3. Because the length of the inconsistent elongation of the strip steel welding seam can reach nearly 12 meters, an operator must set the shearing length of the waste plate of the flying shear equipment according to the length of the inconsistent elongation, and the labor intensity of the operator is increased.
The date of the publication of the invention is 1/27 2010, and the publication of the invention is CN 100584476C, which discloses a tension control system and method for a planetary gear structure tensioning and editing type temper mill. Thereby effectively reducing the amplitude of fluctuation due to tension. In addition, the technical scheme also considers the elongation percentage of the strip steel, and the elongation percentage is used for compensating the tension control, so that the tension control is more accurate.
However, the above technical solution is to perform the transition of tension adjustment according to the average value of the inlet tension and the outlet tension of the temper mill, and the tension switching control of the strip steel weld over the temper mill adopts a control mode, which still has certain limitations, and the implementation effect cannot completely meet the requirements of actual process control.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tension switching control method for strip steel welding seam over-flattening equipment. The tension amplitude limiting model with the strip steel sectional area as the independent variable is established, a mode of respectively controlling the inlet tension and the outlet tension of the temper mill is adopted, meanwhile, the tension switching control of the strip steel welding seam over-temper mill adopts a control mode of instantaneous and interval automatic switching, the tension automatic switching of the strip steel welding seam over-temper mill adopts different interval control modes according to the positive value or the negative value of the tension variable quantity of the strip steel in front and at the back, so that the requirements of process control can be better met, the yield of a unit is improved, the labor intensity of an operator is reduced, the strip steel breakage accident of the strip steel of the unit temper mill is avoided, and the product yield of the unit is improved.
The technical scheme of the invention is as follows: the method for controlling tension switching of the strip steel welding line over-flattening equipment comprises the following steps of detecting the tension of the current coiled strip steel at the inlet and the outlet of a flattening machine, and is characterized in that:
1) Collecting parameters of a current coil of strip steel and a next coil of strip steel;
2) Establishing a tension amplitude limiting model taking the sectional area of the current coiled strip steel as an independent variable;
3) Judging whether any threshold value of an inlet tension switching threshold value SPM _ ETEN _ CHG or an outlet tension switching threshold value SPM _ DTEN _ CHG of the temper mill is smaller than a tension switching threshold value K5; if not, executing the step 4); if yes, executing the step 5);
4) Tension switching of the temper mill adopts a 'B point instantaneous switching mode' to carry out automatic switching control; then, the step 8) is executed;
the 'B point instantaneous switching mode' comprises the following steps:
4.1 Time point B) is calculated according to the following formula:
automatically switching and controlling a moment point SPM _ TRK _ LEN _ B = strip steel tracking calculation length SPM _ TRK _ LEN when a strip steel welding seam passes through WPD by tension of the temper mill;
4.2 Tension switching of the temper mill is automatically switched and controlled by the point B calculated in the step 4.1);
4.3 The slope of the leveler inlet tension switch is calculated according to the following equation:
the leveler inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (SET leveler inlet tension SPM _ ETEN _ SET-leveler inlet tension feedback value SPM _ ETEN _ FBK) × leveler CPU SCAN time R _ COM _ RAMP _ SET _ SCAN × leveler inlet tension switching coefficient K3;
4.4 The slope of the temper mill exit tension switch is calculated according to the following equation:
the temper mill outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (temper mill outlet tension SET value SPM _ DTEN _ SET-temper mill outlet tension feedback value SPM _ DTEN _ FBK) — the temper mill CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — temper mill outlet tension switching coefficient K4;
4.5 According to the calculated result, controlling the tension switching slope of the inlet of the leveler and the tension switching slope of the outlet of the leveler;
5) Judging whether the tension set value of the current strip steel roll is smaller than the tension set value of the next strip steel roll; if yes, executing the step 6); if not, executing the step 7);
6) The tension switching of the temper mill adopts an A-B interval switching mode to carry out automatic switching control; then executing the step 8);
the "A-B interval switching mode" includes:
6.1 Time point a) is calculated according to the following formula:
the length SPM _ TRK _ LEN _ A = the length SPM _ TRK _ LEN _ B of the tension automatic switching control point A of the temper mill, and the length SPM _ TRK _ LEN _ B of the tension automatic switching control point B of the temper mill, wherein the strip steel is welded to the length K9 from the center of the temper mill;
6.2 Time point B) is calculated according to the following formula:
automatically switching and controlling the length SPM _ TRK _ LEN _ B of a moment point B of the tension of the temper mill, and calculating the length SPM _ TRK _ LEN by tracking the strip steel when the strip steel weld passes through the WPD;
6.3 When the inlet tension of the temper mill is switched at a time point A, the intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension is firstly switched, and then the intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension of the next coil of strip steel is automatically switched at a time point B;
wherein, the intermediate inlet tension SET value SPM _ ETEN _ SET _ M = (the SET value SPM _ DTEN _ SET _ C of the inlet tension of the current strip coil of the temper mill-the SET value SPM _ DTEN _ SET _ N of the next coil of the temper mill)/the intermediate inlet tension SET value switching coefficient K6 of the temper mill;
6.4 When the outlet tension of the temper mill is switched at a time point A, the outlet tension is firstly switched to an intermediate SET value SPM _ DTEN _ SET _ M of the outlet tension, and then the outlet tension is automatically switched to a SET value SPM _ DTEN _ SET _ N of the outlet tension of the next coil of strip steel at a time point B;
the outlet tension intermediate SET value SPM _ DTEN _ SET _ M = (the current outlet tension SET value SPM _ DTEN _ SET _ C of the temper mill-the next coil outlet tension SET value SPM _ DTEN _ SET _ N of the temper mill)/the temper mill outlet tension intermediate SET value switching coefficient K7;
6.5 The slope of the temper mill inlet tension switching is controlled by calculating a value according to the following formula:
planisher inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (whole machine inlet tension SET value SPM _ ETEN _ SET-planisher inlet tension feedback value SPM _ ETEN _ FBK) — planisher CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — planisher inlet tension switching coefficient K3;
6.6 The slope of the temper mill exit tension switch is controlled by calculating a value according to the following formula:
the temper mill outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (temper mill outlet tension SET value SPM _ DTEN _ SET-temper mill outlet tension feedback value SPM _ DTEN _ FBK) — the temper mill CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — temper mill outlet tension switching coefficient K4;
7) The tension switching of the temper mill adopts a 'B-C interval switching mode' to carry out automatic switching control; then, the step 8) is executed;
the 'B-C interval switching mode' comprises the following steps:
7.1 Time point B) is calculated according to the following formula:
automatically switching and controlling the length SPM _ TRK _ LEN _ B of a moment point B of the tension of the temper mill, namely, tracking and calculating the length SPM _ TRK _ LEN of the strip steel when the strip steel passes through the WPD;
7.2 Time point C) is calculated according to the following formula:
the length SPM _ TRK _ LEN _ C = the length SPM _ TRK _ LEN _ B + the length K10 from the strip steel welding seam to the center of the temper mill;
7.3 When the inlet tension of the temper mill is switched to the point of time B, the intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension is firstly switched to, and then the intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension is automatically switched to the next roll of outlet tension SET value SPM _ ETEN _ SET _ N at the point of time C;
wherein, the intermediate inlet tension SET value SPM _ ETEN _ SET _ M = (current inlet tension SET value SPM _ ETEN _ SET _ C-next roll of inlet tension SET value SPM _ ETEN _ SET _ N of the temper mill)/intermediate inlet tension SET value switching coefficient K6 of the temper mill;
7.4 When the tension of the outlet of the temper mill is switched at a time point B, the tension is firstly switched to an intermediate SET value SPM _ DTEN _ SET _ M of the outlet tension, and then the tension is automatically switched to a next roll of SET value SPM _ DTEN _ SET _ N of the inlet tension at a time point C;
wherein, the outlet tension intermediate SET value SPM _ DTEN _ CHG _ M = (current outlet tension SET value SPM _ DTEN _ SET _ C-next coil outlet tension SET value SPM _ DTEN _ SET _ N of the temper mill)/temper mill outlet tension intermediate SET value switching coefficient K7;
7.5 The slope of the temper mill inlet tension switching is controlled by calculating a value according to the following formula:
planisher inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (whole machine inlet tension SET value SPM _ ETEN _ SET-planisher inlet tension feedback value SPM _ ETEN _ FBK) — planisher CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — planisher inlet tension switching coefficient K3;
7.6 The slope of the temper mill exit tension switch is controlled by calculating a value according to the following formula:
the temper mill outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (temper mill outlet tension SET value SPM _ DTEN _ SET-temper mill outlet tension feedback value SPM _ DTEN _ FBK) — the temper mill CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — temper mill outlet tension switching coefficient K4;
8) Ending the switching control process of the welding line;
9) The next weld is ready to be switched.
Further, in the step 1), the parameters of the strip steel at least include a thickness of a current strip steel coil, a width of the current strip steel coil, a set value of an inlet tension of a current strip temper mill, a set value of an outlet tension of the current strip temper mill, a thickness of steel of a next strip steel coil, a width of the next strip steel coil, a set value of an inlet tension of the temper mill of the next strip steel coil, and a set value of an outlet tension of the temper mill of the next strip steel coil.
Further, in the step 2), the tension amplitude limiting model with the current coil steel sectional area as an independent variable includes calculation of an inlet tension setting amplitude limit of the temper mill, calculation of an outlet tension setting amplitude limit of the temper mill, calculation of an inlet tension switching slope of the temper mill, and calculation of an outlet tension switching slope of the temper mill.
Compared with the prior art, the invention has the advantages that:
1. according to the technical scheme, a tension amplitude limiting model with the strip steel sectional area as the independent variable is established, so that the defect that after a thin soft steel welding line passes through a temper mill due to the fact that the tension amplitude limiting model with the strip steel sectional area as the independent variable is not established in the prior art is overcome, the strip breakage accident can occur due to improper tension setting, and the stable operation of a unit is guaranteed to a certain extent;
2. the tension switching control of the strip steel welding line over-flattening machine adopts a control mode of instantaneous and interval automatic switching, overcomes the defect that the shearing length of the waste plate of the flying shear is required to be set by an operator according to the length of inconsistent elongation rate because the length of inconsistent elongation rate of the strip steel welding line before and after the strip steel welding line can reach nearly 12M, and reduces the labor intensity of the operator to a certain extent;
3. the tension automatic switching of the strip steel over-flattening machine adopts different interval control modes according to the positive or negative value of the tension variation quantity before and after the strip steel, the influence of the variation value of the tension switching of the strip steel before and after the welding line on the elongation rate is not considered, the length of the elongation rate before and after the strip steel welding line is not in accordance is controlled within 6M, the process requirement is met, and the yield of a unit is improved on the other fixed degree.
Drawings
FIG. 1 is a schematic layout of a levelling apparatus;
fig. 2 is a block diagram of the control flow of the present invention.
In the figure, 1 is a No. 6 tension roller, 2 is an inlet tension measuring roller, 3 is a first steering roller, 4 is a crease-resisting roller, 5 is a supporting roller, 6 is a working roller, 7 is a fracture-resisting roller, 8 is a second steering roller, 9 is an outlet tension measuring roller, 10 is a No.7 tension roller, and 11 is a rolling line adjusting system.
Detailed Description
The invention is further described below with reference to the following figures and examples.
In fig. 2, the technical solution of the present invention provides a control method for tension switching of strip steel weld over-flattening equipment, which includes detecting the tensions of the current coiled strip steel at the inlet and the outlet of a flattening machine, and the invention is characterized in that:
1) Collecting parameters of a current coil of strip steel and a next coil of strip steel;
2) Establishing a tension amplitude limiting model taking the sectional area of the current coiled strip steel as an independent variable;
3) Judging whether any threshold value of an inlet tension switching threshold value SPM _ ETEN _ CHG or an outlet tension switching threshold value SPM _ DTEN _ CHG of the temper mill is smaller than a tension switching threshold value K5; if not, executing the step 4); if yes, executing the step 5);
4) Tension switching of the temper mill adopts a 'B point instantaneous switching mode' to carry out automatic switching control; then executing the step 8);
5) Judging whether the tension set value of the current strip steel roll is smaller than the tension set value of the next strip steel roll; if yes, executing the step 6); if not, executing the step 7);
6) The tension switching of the temper mill adopts an A-B interval switching mode to carry out automatic switching control; then, the step 8) is executed;
7) Tension switching of the temper mill is automatically switched and controlled by adopting a B-C interval switching mode; then, the step 8) is executed;
8) Ending the welding seam switching control process;
9) And preparing to switch the next welding seam.
Furthermore, in order to ensure that the length of the strip steel with inconsistent elongation percentage is controlled within 6 meters of the process requirement after the strip steel welding seam passes through the temper mill, avoid the strip breakage accident of the strip steel of the temper mill of the unit, reduce the labor intensity of operators and improve the yield of the unit, the technical scheme of the invention adopts the following key technical steps:
1. establishing a tension amplitude limiting model with the sectional area of the strip steel as an independent variable;
2. tension switching control of the strip steel welding line over-flattening machine adopts a control mode of automatic switching between instant and interval;
3. the tension of the strip steel weld over-flattening machine is automatically switched, and different interval control modes are adopted according to the positive or negative value of the tension variation quantity before and after strip steel.
The technical scheme is applicable to the specification of the strip steel as follows: thickness 0.25-2.3mm, width: 700-1630mm. The running speed of the leveling section is 0-220 m/min.
Specifically, the technical scheme of the invention is described as follows:
1. establishing a tension amplitude limiting model taking the sectional area of the strip steel as an independent variable:
1.1, calculating tension setting amplitude limit of an inlet of a temper mill:
R_SPME_TEN_MAX＝SPM_EENTTHICK_C*SPM_EENTWIDTH_C*K1------(1)
when R _ SPME _ TEN _ MAX is greater than or equal to R _ SPM _ TEN _ MAX, R _ SPME _ TEN _ MAX takes the value of R _ SPM _ TEN _ MAX.
In the formula: r _ SPME _ TEN _ MAX: the amplitude limiting value of the tension set value at the inlet of the temper mill is as follows, unit: KN;
SPM _ EENTTHICK _ C: thickness of strip steel at the inlet of the temper mill, unit: mm;
SPM _ EENTWIDTH _ C: width of strip steel at the inlet of the temper mill, unit: mm;
k1: unit tension coefficient of inlet of the temper mill, unit: KN/mm 2 Preferably, the following components are used: 0.08-0.30;
r _ SPM _ TEN _ MAX: the maximum tension value of the temper mill is shown in unit: KN is a constant, and the large tension value of the unit is as follows: 125KN.
Namely: the set value of the tension at the inlet of the temper mill is the amplitude limit value = the thickness of strip steel at the inlet of the temper mill and the width of the strip steel at the inlet of the temper mill and the unit tension coefficient of the inlet of the temper mill.
And when the amplitude limit value of the tension set value at the inlet of the temper mill is not less than the maximum tension value of the temper mill, the amplitude limit value of the tension set value at the inlet of the temper mill is the maximum tension value of the temper mill.
It should be noted that, because the technical solution of the present invention relates to the welding seam between the current coil of strip steel (referred to as the current coil of strip steel) which is currently running on the temper mill and the next coil of strip steel (referred to as the next coil of strip steel) which is located behind the current coil of strip steel (referred to as the next coil of strip steel), for the brief introduction of the description, except for the specific points, the rest refer to the specification parameters of the current coil of strip steel or the working parameters and set values for the current coil of strip steel.
1.2, calculating the set amplitude limit of the outlet tension of the temper mill:
R_SPMD_TEN_MAX＝SPM_DENTTHICK_C*SPM_DENTWIDTH_C*K2-------(2)
when R _ SPMD _ TEN _ MAX is larger than or equal to R _ SPM _ TEN _ MAX, taking R _ SPM _ TEN _ MAX;
in the formula: r _ SPMD _ TEN _ MAX: the amplitude limiting value of the tension set value at the outlet of the temper mill is as follows: KN;
SPM _ DENTTHICK _ C: thickness of strip steel at the outlet of the temper mill, unit: mm;
SPM _ DENTWIDTH _ C: width of the strip steel at the position of the temper mill, unit: mm;
k2: outlet tension coefficient per unit of temper mill, unit: KN/mm 2 Preferably, the following components are used: 0.06-0.32
R _ SPM _ TEN _ MAX: the maximum tension value of the temper mill is shown in unit: KN is a constant, and the unit is as follows: 125KN.
Namely: the amplitude limiting value of the tension set value at the outlet of the temper mill = the thickness of strip steel at the outlet of the temper mill and the width of the strip steel at the position of the outlet of the temper mill and the unit tension coefficient at the outlet of the temper mill;
and when the amplitude limit value of the tension set value at the outlet of the temper mill is not less than the maximum tension value of the temper mill, the amplitude limit value of the tension set value at the outlet of the temper mill is the maximum tension value of the temper mill.
1.3, calculating the switching slope of the inlet tension of the temper mill:
SPM_EENT_RAMP_SET＝ABS(SPM_ETEN_SET-SPM_ETEN_FBK)*R_COM_RAMP_SET_SCAN*K3--------------------------------(3)
in the formula: SPM _ eet _ RAMP _ SET: temper mill entry tension switches slope, unit: KN/SCAN;
SPM _ ETEN _ SET: a tension set value of an inlet of the temper mill; unit: KN;
SPM _ ETEN _ FBK: an inlet tension feedback value of the temper mill; unit: KN;
r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is as follows: second, the scanning time of the CPU of the unit is 0.05 second;
k3: the tension switching coefficient of the inlet of the temper mill; preferably, the following components are used: 0.1-2.
Namely: the tension switching slope of the inlet of the temper mill = ABS (tension set value of the inlet of the temper mill-tension feedback value of the inlet of the temper mill), scanning time of a CPU of the temper mill and tension switching coefficient of the inlet of the temper mill.
1.4, calculating the switching slope of the tension at the outlet of the temper mill:
SPM_DENT_RAMP_SET＝ABS(SPM_DTEN_SET-SPM_DTEN_FBK)*R_COM_RAMP_SET_SCAN*K4--------------------------------(4)
in the formula: SPM _ DENT _ RAMP _ SET: the tension switching slope of the outlet of the temper mill is as follows, unit: KN/SCAN;
SPM _ DTEN _ SET: tension set value at outlet of the temper mill: unit: KN;
SPM _ DTEN _ FBK: the tension feedback value of the outlet of the temper mill is as follows: unit: KN;
r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is as follows: second, the scanning time of the CPU of the unit is 0.05 second;
k4: tension switching coefficient of outlet of the temper mill: preferably: 0.1-2.
Namely: the tension switching slope of the outlet of the temper mill = ABS (set value of tension of the outlet of the temper mill-feedback value of tension of the outlet of the temper mill) × scanning time of a CPU (central processing unit) of the temper mill and a tension switching coefficient of the outlet of the temper mill.
2. The tension switching control of the strip steel welding line over-temper mill adopts automatic switching between instant and interval:
2.1, calculating a threshold value of the tension instantaneous and interval automatic switching control of the temper mill:
SPM_ETEN_CHG＝ABS(SPM_ETEN_SET_C-SPM_ETEN_SET_N)------(5)
in the formula: SPM _ ETEN _ CHG: inlet tension switching threshold of the temper mill, unit: KN;
SPM _ ETEN _ SET _ C: the tension set value of the current strip steel coil inlet of the temper mill (called the current tension set value for short), unit: KN;
SPM _ ETEN _ SET _ N: the inlet tension set value (called the next inlet tension set value for short) of the next coil of strip steel of the temper mill has the unit: KN;
namely: the inlet tension switching threshold of the temper mill = ABS (current inlet tension set value of the temper mill-the next coil inlet tension set value of the temper mill);
the current inlet tension set value of the temper mill refers to an inlet tension set value of strip steel on the temper mill at present, and the inlet tension set value of the next coil of the temper mill refers to an inlet tension set value of the next coil of strip steel to enter the temper mill.
SPM_DTEN_CHG＝ABS(SPM_DTEN_SET_C-SPM_DTEN_SET_N)------(6)
In the formula: SPM _ DTEN _ CHG: the outlet tension switching threshold of the temper mill, unit: KN;
SPM _ DTEN _ SET _ C: tension set value at the current outlet of the temper mill, unit: KN;
SPM _ DTEN _ SET _ N: tension set value of the next coil of outlet of the temper mill, unit: KN.
Namely: the exit tension switching threshold of the temper mill = ABS (current exit tension set value of the temper mill — next roll exit tension set value of the temper mill).
When any value of the tension switching threshold value of the inlet of the temper mill and the tension switching threshold value of the outlet of the temper mill reaches the tension switching threshold value K5, the tension of the temper mill is automatically switched and controlled instantly and in intervals.
The tension switching threshold K5 is preferably 5-40KN.
2.2, calculating a set value in the middle of automatic switching control of the tension interval of the temper mill:
SPM_ETEN_CHG_M＝(SPM_ETEN_SET_C-SPM_ETEN_SET_N)/K6---(7)
in the formula: SPM _ ETEN _ CHG _ M: set value, unit, in the middle of temper mill entry tension: KN;
SPM _ ETEN _ SET _ C: tension set value at the current inlet of the temper mill, unit: KN;
SPM _ ETEN _ SET _ N: tension set value of next roll of entry of temper mill, unit: KN;
k6: and (4) a set value switching coefficient in the middle of the inlet tension of the temper mill. Preferably, the following components are used: 0.5-5.0.
Namely: and the intermediate tension set value of the inlet of the temper mill = (the set value of the inlet tension of the current strip steel coil of the temper mill-the set value of the tension of the next coil of the temper mill)/the intermediate tension set value switching coefficient of the inlet of the temper mill.
SPM_DTEN_CHG_M＝(SPM_DTEN_SET_C-SPM_DTEN_SET_N)/K7---(8)
In the formula: SPM _ DTEN _ CHG _ M: set value, unit in the middle of the temper mill outlet tension: KN;
SPM _ DTEN _ SET _ C: the tension set value at the current outlet of the temper mill, unit: KN;
SPM _ DTEN _ SET _ N: tension set value, unit of the next roll of outlet of the temper mill: KN;
k7: and (4) a set value switching coefficient in the middle of the outlet tension of the temper mill. Preferably, the following components are used: 0.5-5.0.
Namely: and the intermediate tension set value of the outlet of the temper mill = (the current tension set value of the outlet of the temper mill-the tension set value of the next coil of the temper mill)/the intermediate tension set value switching coefficient of the outlet of the temper mill.
2.3, calculating tension automatic switching control time points of the temper mill:
K8＝R_7BR2_GEAR*R_7BR2_RD*R_PAI/R_DRIVE_PLS-----(9)
in the formula: k8: the length of the strip steel corresponding to each pulse is in mm/PLS. The unit is as follows: 0.6012054mm/PLS.
R _7BR2_GEAR: the gear ratio of the NO.7 tension roller NO.2 roller gear box is as follows: 0.03266479;
r _ 7BR2. Multidot.RD: NO.7 tension roll No.2 roll diameter in units of: mm, this unit is: 1499.8mm;
r _ PAI: the circumferential ratio is a constant: 3.14159;
r _ DRIVE _ PLS: NO.7 tension roller NO.2 roller motor rotates one time pulse number, unit is: one/circle, this unit is: 256 per turn.
Namely: the length of the corresponding strip for each pulse = No.7 tension roller No.2 roller gear ratio of gear box No.7 tension roller No.2 roller diameter circumference ratio/No. 7 tension roller No.2 roller motor number of pulses per revolution.
In the formula: SPM _ TRK _ LEN: calculating the length of the strip steel when the strip steel welding seam passes through WPD (Weld detector), wherein the unit is meter (m);
7BR2_RTC: no.7 tension roller No.2 roller rotation gives a pulse number, unit: number (PLS);
namely: strip steel tracking calculation when strip steel welding seam passes through WPD
Tension roll No.2 number of pulses per pulse per length of strip per rotation of the rolls/1000.
SPM_TRK_LEN_A＝SPM_TRK_LEN_B-K9-----------------(11)
In the formula: SPM _ TRK _ LEN _ a: the tension of the temper mill is automatically switched to control the length of the A time point, and the unit is as follows: rice;
SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: m is a constant, and the unit is as follows: 40.4m;
k9: the length from the welding seam of the strip steel to the center of the temper mill is as follows: m, preferably: 1-6m.
Namely: the length of the tension automatic switching control point A of the temper mill = the length of the tension automatic switching control point B of the temper mill, namely the length from the strip steel welding to the center of the temper mill.
SPM_TRK_LEN_B＝SPM_TRK_LEN-----------------(12)
In the formula: SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: and m is selected. Is a constant, the unit is: 40.4m;
SPM _ TRK _ LEN: calculating the length of the strip steel when the strip steel weld passes through WPD (weld detector), wherein the unit is m;
namely: and (3) automatically switching tension of the temper mill to control the length of the time point B = the strip steel tracking calculation length when the strip steel welding seam passes through the WPD.
SPM_TRK_LEN_C＝SPM_TRK_LEN_B+K10-----------------(13)
In the formula: SPM _ TRK _ LEN _ C: the tension automatic switching control C time point length of the temper mill is as follows: m;
SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: and m is selected. Is a constant, the unit is: 40.4m;
k10: the length from the strip steel welding seam to the center of the over-temper mill is as follows: m, preferably: 1-6m.
Namely: the length of the tension automatic switching control moment C of the temper mill is equal to the length of the tension automatic switching control moment B of the temper mill plus the length from the strip steel welding line to the center of the temper mill.
3. The tension automatic switching of the strip steel welding line over-temper mill adopts different intervals according to the positive or negative value of the tension variable quantity of the strip steel front and back:
3.1, when the threshold values calculated by the formula (5) and the formula (6) are smaller than a K5 value, the tension switching of the temper mill is controlled by automatically switching the B time point calculated by the formula (12), the slope of the inlet tension switching is controlled by the calculated value of the formula (3), and the slope of the outlet tension switching is controlled by the calculated value of the formula (4).
And 3.2, when the threshold value calculated by the formula (5) and the formula (6) is larger than a K5 value and the current tension value is smaller than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the A time point calculated by the formula (11), firstly switching to the inlet tension intermediate SET value (SPM _ ETEN _ SET _ M) calculated by the formula (7), and then automatically switching to the inlet tension SET value (SPM _ ETEN _ SET _ N) of the next roll at the B time point calculated by the formula (12).
When the tension of the outlet of the temper mill is switched to the A time point calculated by the formula (11), the tension is firstly switched to the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8), and then the tension is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the inlet tension of the next roll at the B time point calculated by the formula (12).
The slope of the inlet tension switching is controlled by the calculated value of formula (3), and the slope of the outlet tension switching is controlled by the calculated value of formula (4).
And 3.3, when the threshold value calculated by the formula (5) and the formula (6) has a value larger than K5 and the current tension value is larger than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the B time point calculated by the formula (12), firstly switching to the inlet tension intermediate SET value (SPM _ ETEN _ SET _ M) calculated by the formula (7), and then automatically switching to the next roll outlet tension SET value (SPM _ ETEN _ SET _ N) at the C time point calculated by the formula (13).
When the tension of the outlet of the temper mill is switched to the B time point calculated by the formula (12), the tension is firstly switched to the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8), and then the tension is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the inlet tension of the next roll at the C time point calculated by the formula (13).
The slope of the inlet tension switching is controlled by the calculated value of formula (3), and the slope of the outlet tension switching is controlled by the calculated value of formula (4).
Example (b):
the technical scheme of the invention is further illustrated by the following examples.
Example 1:
the current thickness of the strip steel is as follows: 0.692mm, current strip width: 1653mm, current temper mill inlet tension set point: 40KN, current temper mill outlet tension set value: 45KN of the main body and the auxiliary body,
thickness of the next coil of strip steel: 0.656mm, width of the next coil of strip steel: 1518mm, tension set value of next coil of planisher entrance: 35KN, the tension set value of the outlet of the next coil of temper mill: 40KN.
1. A tension amplitude limiting model with the strip steel sectional area as an independent variable is established:
1. and (3) calculating the tension setting amplitude limit of the inlet of the temper mill:
from equation (1):
r _ SPME _ TEN _ MAX =0.692 × 1653 × 0.18=205kn, and 125KN clipping is performed (i.e., "when R _ SPME _ TEN _ MAX is equal to or greater than R _ SPM _ TEN _ MAX, R _ SPM _ TEN _ MAX" is performed).
Wherein, K1's value, this unit is: 0.18KN/MM 2 ；
R _ SPM _ TEN _ MAX: the unit is as follows: 125KN.
2. And (3) calculating the tension setting amplitude limit of the outlet of the temper mill:
from equation (2) we can derive:
r _ SPMD _ TEN _ MAX =0.692 × 1653 × 0.20=228kn, and 125KN clipping is taken (that is, "when R _ SPMD _ TEN _ MAX is equal to or greater than R _ SPM _ TEN _ MAX, R _ SPM _ TEN _ MAX" is taken).
Wherein: k2: the unit is as follows: 0.20KN/mm 2 ；
R _ SPM _ TEN _ MAX: the machine set is as follows: 125KN.
3. Calculating the switching slope of the inlet tension of the temper mill:
from equation (3) we can derive:
SPM_EENT_RAMP_SET＝ABS(40-35)*0.05*0.75＝0.1875KN/SCAN；
wherein: r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is 0.05 second;
k3: the machine set is as follows: 0.75.
4. and (3) calculating the tension switching slope of the outlet of the temper mill:
from equation (4):
SPM_DENT_RAMP_SET＝ABS(45-40)*0.05*0.75＝0.1875KN/SCAN；
wherein: r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is 0.05 second;
k4: outlet tension switching coefficient of temper mill: the unit is as follows: 0.75.
2. the tension switching control of the strip steel welding line over-temper mill adopts automatic switching between instant and interval:
1. calculating the threshold value of the tension instantaneous and interval automatic switching control of the temper mill:
from equation (5):
SPM_ETEN_CHG＝ABS(40-35)＝5KN；
from equation (6):
SPM_DTEN_CHG＝ABS(40-35)＝5KN；
when any value of the inlet tension switching threshold value and the outlet tension switching threshold value of the planisher reaches a tension switching threshold value K5, the tension of the planisher is automatically switched and controlled instantly and within a certain interval.
K5 is preferably 5-40KN, and the unit is 20KN.
And when any one of the inlet tension switching threshold value and the outlet tension switching threshold value of the temper mill is smaller than a K5 (20 KN) value, adopting an instant tension switching control method.
2. And (3) calculating a set value in the middle of automatic switching control of the tension section of the temper mill:
for equation (7), where the value of K6 is 2, the set is.
For equation (8), where the value of K7 is 2, the set.
3. And (3) calculating tension automatic switching control time points of the temper mill:
for the formula (9), where the K8 value (the length of the strip corresponding to each pulse) is: 0.6012054mm/PLS;
r _7BR2_GEAR: the gear ratio of the NO.7 tension roller NO.2 roller gear box is as follows: 0.03266479;
r _ 7BR2. Multidot.RD: NO.7 tension roll No.2 roll diameter in units of: MM, this unit is: 1499.8mm;
r _ DRIVE _ PLS: NO.7 tension roller NO.2 roller motor rotates one time pulse number, unit is: one/circle, this unit is: 256 per turn.
Then the calculation is performed according to equation (10) to obtain the following result:
SPM_TRK_LEN＝67198*0.6012054/1000＝40.399m。
when the calculation is performed according to equation (11), the following results are obtained:
SPM _ TRK _ LEN _ B (the length of a tension automatic switching control B moment point of the temper mill), the unit is as follows: 40.4m.
K9 (the length from the center of the leveler to which the strip steel is welded) is 3m.
According to equation (12), there is the following result:
SPM _ TRK _ LEN _ B (the length of the tension automatic switching control point B of the temper mill): the unit is 40.4m.
According to equation (13), the following result is obtained:
SPM _ TRK _ LEN _ B (the length of a tension automatic switching control B moment point of the temper mill), the unit is as follows: 40.4m.
Wherein, K10 (the length of strip steel welding to the center of the over-temper mill) value, this unit is: 3m, is added.
3. The tension automatic switching of the strip steel welding line over-temper mill adopts different intervals according to the positive or negative value of the front and back tension variable quantity of the strip steel:
the following description is given by adopting different control modes for automatically switching the tension of the strip steel weld over-temper mill according to the positive or negative value of the tension variation quantity before and after strip steel:
1. when the threshold values calculated by the formula (5) and the formula (6) are smaller than the K5 value, the tension switching of the temper mill is controlled by automatically switching the B time point calculated by the formula (12), the slope of the tension switching of the inlet is controlled by the calculated value of the formula (3), and the slope of the tension switching of the outlet is controlled by the calculated value of the formula (4).
When the threshold value 5KN calculated by the formula (5) and the formula (6) is smaller than the K5 value (20 KN), the tension switching of the temper mill is automatically switched and controlled by a B time point (40.4) calculated by the formula (12), the slope of the inlet tension switching is controlled by the calculated value 0.1875KN/SCAN of the formula (3), and the slope of the outlet tension switching is controlled by the calculated value 0.1875KN/SCAN of the formula (4).
2. When the threshold value calculated by the formula (5) and the formula (6) is larger than a value K5 and the current tension value is smaller than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the A time point calculated by the formula (11), the inlet tension is firstly switched to the inlet tension intermediate SET value (SPM _ ETEN _ SET _ M) calculated by the formula (7), and then the inlet tension SET value (SPM _ ETEN _ SET _ N) of the next roll is automatically switched to the B time point calculated by the formula (12).
When the tension of the outlet of the temper mill is switched to the A time point calculated by the formula (11), the tension is firstly switched to the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8), and then the tension is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the inlet tension of the next roll at the B time point calculated by the formula (12).
The slope of the inlet tension switching is controlled by the calculated value of formula (3), and the slope of the outlet tension switching is controlled by the calculated value of formula (4).
3. When the threshold value calculated by the formula (5) and the formula (6) is larger than a K5 value and the current tension value is larger than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the B time point calculated by the formula (12), the outlet tension is firstly switched to the middle SET value (SPM _ DTEN _ SET _ M) calculated by the formula (8), and then the outlet tension is automatically switched to the next roll outlet tension SET value (SPM _ DTEN _ SET _ N) at the C time point calculated by the formula (13).
When the tension of the outlet of the temper mill is switched to the B time point calculated by the formula (12), the tension is firstly switched to the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8), and then the tension is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the inlet tension of the next roll at the C time point calculated by the formula (13).
The slope of the inlet tension switching is controlled by the calculated value of formula (3), and the slope of the outlet tension switching is controlled by the calculated value of formula (4).
Example 2:
the current thickness of the strip steel is as follows: 0.644mm, current strip width: 1076mm. Current temper mill entry tension set point: 80KN, current temper mill outlet tension set value: 85KN of the main body and the auxiliary body,
thickness of the next coil of strip steel: 0.739mm, width of the next strip: 1028mm, tension set value of the inlet of the next planisher: 30KN, and the tension set value of the outlet of the next coil of temper mill: 35KN.
1. The tension amplitude limiting model with the strip steel section area as an independent variable comprises the following steps:
1. and (3) calculating the tension setting amplitude limit of the inlet of the temper mill:
R_SPME_TEN_MAX＝SPM_EENTTHICK_C*SPM_EENTWIDTH_C*K1------(1)
r _ SPME _ TEN _ MAX =0.739 × 1028 × 0.18=136.7KN, 125KN clipping is taken;
when R _ SPME _ TEN _ MAX is larger than or equal to R _ SPM _ TEN _ MAX, taking R _ SPM _ TEN _ MAX;
in the formula: r _ SPME _ TEN _ MAX: the amplitude limiting value of the tension set value at the inlet of the temper mill is as follows, unit: KN;
SPM _ EENTTHICK _ C: thickness of strip steel at the inlet of the temper mill, unit: mm;
SPM _ EENTWIDTH _ C: width of strip steel at the inlet of the temper mill, unit: mm;
k1: unit tension coefficient of inlet of the temper mill, unit: KN/mm 2 Preferably, the following components are used: 0.16-0.20, the unit is: 0.18KN/mm 2 ；
R _ SPM _ TEN _ MAX: the maximum tension value of the temper mill is shown in unit: KN is a constant, and the unit is as follows: 125KN.
2. And (3) calculating the tension setting amplitude limit of the outlet of the temper mill:
R_SPMD_TEN_MAX＝SPM_DENTTHICK_C*SPM_DENTWIDTH_C*K2-------(2)
r _ SPMD _ TEN _ MAX =0.739 × 1028 × 0.20=151.9KN, taking 125KN clipping;
when R _ SPMD _ TEN _ MAX is larger than or equal to R _ SPM _ TEN _ MAX, taking R _ SPM _ TEN _ MAX;
in the formula: r _ SPMD _ TEN _ MAX: the amplitude limiting value of the tension set value at the outlet of the temper mill is as follows: KN
SPM _ denthick _ C: thickness of strip steel at the outlet of the temper mill, unit: mm;
SPM _ DENTWIDTH _ C: width of the strip steel at the position of the temper mill, unit: mm;
k2: exit tension coefficient per unit of temper mill, unit: KN/mm 2 Preferably, the following components are used: 0.06-0.32, the unit is: 0.20KN/mm 2
R _ SPM _ TEN _ MAX: the maximum tension value of the temper mill is shown in unit: KN is a constant, and the unit is as follows: 125KN.
3. And (3) calculating the switching slope of the inlet tension of the temper mill:
SPM_EENT_RAMP_SET＝ABS(SPM_ETEN_SET-SPM_ETEN_FBK)*R_COM_RAMP_SET_SCAN*K3--------------------------------(3)
SPM_EENT_RAMP_SET＝ABS(80-30)*0.05*0.75＝1.875KN/SCAN；
in the formula: SPM _ eet _ RAMP _ SET: temper mill entry tension switches slope, unit: KN/SCAN;
SPM _ ETEN _ SET: inlet tension set value of the temper mill: unit: KN;
SPM _ ETEN _ FBK: inlet tension feedback value of the temper mill: unit: KN;
r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is as follows: second, the local group is 0.05 second;
k3: inlet tension switching coefficient of the temper mill: preferably: 0.5-1, the current group is: 0.75.
4. and (3) calculating the switching slope of the outlet tension of the temper mill:
SPM_DENT_RAMP_SET＝ABS(SPM_DTEN_SET-SPM_DTEN_FBK)*R_COM_RAMP_SET_SCAN*K4--------------------------------(4)
SPM_DENT_RAMP_SET＝ABS(85-35)*0.05*0.75＝1.875KN/SCAN；
in the formula: SPM _ DENT _ RAMP _ SET: the tension switching slope of the outlet of the temper mill is as follows, unit: KN/SCAN;
SPM _ DTEN _ SET: tension set value at outlet of the temper mill: unit: KN;
SPM _ DTEN _ FBK: the tension feedback value of the outlet of the temper mill is as follows: unit: KN;
r _ COM _ RAMP _ SET _ SCAN: the scanning time of the CPU of the temper mill is as follows: second, the local group is 0.05 second;
k4: tension switching coefficient of outlet of the temper mill: preferably, the following components are used: 0.5-1, the current group is: 0.75.
2. the tension switching control of the strip steel welding line over-temper mill adopts automatic switching between instant and interval:
1. calculating the threshold value of the tension instantaneous and interval automatic switching control of the temper mill:
SPM_ETEN_CHG＝ABS(SPM_ETEN_SET_C-SPM_ETEN_SET_N)------(5)
SPM_ETEN_CHG＝ABS(80-30)＝50KN；
in the formula: SPM _ ETEN _ CHG: threshold value is switched to levelling machine entry tension, unit: KN;
SPM _ ETEN _ SET _ C: tension set value at the current inlet of the temper mill, unit: KN;
SPM _ ETEN _ SET _ N: tension set value of the next roll of inlet of the temper mill, unit: KN;
SPM_DTEN_CHG＝ABS(SPM_DTEN_SET_C-SPM_DTEN_SET_N)------(6)
SPM_DTEN_CHG＝ABS(85-35)＝50KN
in the formula: SPM _ DTEN _ CHG: the outlet tension switching threshold of the temper mill, unit: KN;
SPM _ DTEN _ SET _ C: the tension set value at the current outlet of the temper mill, unit: KN;
SPM _ DTEN _ SET _ N: tension set value of the next coil of outlet of the temper mill, unit: KN.
When any value of the inlet tension switching threshold value and the outlet tension switching threshold value of the temper mill reaches the tension switching threshold value K5, the tension of the temper mill is automatically switched and controlled instantly and in intervals. K5 is preferably 15-25KN, and the unit is 20KN.
And when any value of the threshold value of the inlet tension switching of the temper mill and the threshold value of the outlet tension switching of the temper mill is smaller than a K5 (20 KN) value, adopting an instant tension switching control method.
2. And (3) calculating a set value in the middle of automatic switching control of the tension section of the temper mill:
SPM_ETEN_CHG_M＝(SPM_ETEN_SET_C-SPM_ETEN_SET_N)/K6---(7)
SPM_ETEN_CHG_M＝(80+30)/2＝55KN；
in the formula: SPM _ ETEN _ CHG _ M: set value, unit, in the middle of temper mill entry tension: KN;
SPM _ ETEN _ SET _ C: tension set value at the current inlet of the temper mill, unit: KN;
SPM _ ETEN _ SET _ N: tension set value of the next roll of inlet of the temper mill, unit: KN;
k6: and (4) a set value switching coefficient in the middle of the inlet tension of the temper mill. Preferably: 1.8-2.2 the unit is: 2.
SPM_DTEN_CHG_M＝(SPM_DTEN_SET_C-SPM_DTEN_SET_N)/K7---(8)
SPM_DTEN_CHG_M＝(85+35)/2＝60KN
in the formula: SPM _ DTEN _ CHG _ M: set value, unit in the middle of the temper mill outlet tension: KN;
SPM _ DTEN _ SET _ C: tension set value at the current outlet of the temper mill, unit: KN;
SPM _ DTEN _ SET _ N: tension set value, unit of the next roll of outlet of the temper mill: KN;
k7: and (4) a set value switching coefficient in the middle of the outlet tension of the temper mill. Preferably: 1.8-2.2 the unit is: 2. 3. calculating tension automatic switching control time points of the temper mill:
K8＝R_7BR2_GEAR*R_7BR2_RD*R_PAI/R_DRIVE_PLS-----(9)
in the formula: k8: the length of the strip steel corresponding to each pulse is in mm/PLS. The unit is as follows: 0.6012054mm/PLS;
r _7BR2_GEAR: no.7 tensioning roller No.2 roller gear box gear ratio, this unit is: 0.03266479;
r _ 7BR2. Multidot.RD: NO.7 tension roll No.2 roll diameter in units of: MM, this unit does: 1499.8MM;
r _ PAI: the circumferential ratio is a constant: 3.14159;
r _ DRIVE _ PLS: NO.7 tension roller NO.2 roller motor rotates one time pulse number, unit is: one/circle, this unit is: 256 per turn;
SPM_TRK_LEN＝72187*0.6012054/1000＝43.399M；
in the formula: SPM _ TRK _ LEN: calculating the length of the strip steel when the strip steel weld passes through WPD (weld detector), wherein the unit is M;
7br2_rtc: no.7 tension roller No.2 roller rotation gives a pulse number, unit: number (PLS);
SPM_TRK_LEN_A＝SPM_TRK_LEN_B-k9-----------------(11)
in the formula: SPM _ TRK _ LEN _ a: the tension automatic switching control A time point length of the temper mill is as follows: m;
SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: m; is a constant, the unit is: 40.4M;
k9: the length of the strip steel welded to the center of the temper mill, unit: m, preferably: 2-4M, the unit is: 3M;
SPM_TRK_LEN_B＝SPM_TRK_LEN-----------------(12)
in the formula: SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: m; is a constant, the unit is: 40.4M;
SPM _ TRK _ LEN: calculating the length of the strip steel when the strip steel weld passes through WPD (weld detector), wherein the unit is M;
SPM_TRK_LEN_C＝SPM_TRK_LEN_B+k10-----------------(13)
SPM_TRK_LEN_C＝40.4+3＝43.4M；
in the formula: SPM _ TRK _ LEN _ C: the tension automatic switching control C time point length of the temper mill is as follows: m;
SPM _ TRK _ LEN _ B: the tension of the temper mill is automatically switched to control the length of the time point B, and the unit is as follows: m; is a constant, the unit is: 40.4M;
k10: the length of the strip steel welded to the center of the over-temper mill is as follows: m, preferably: 2-4M, the unit is: 3M of the total weight.
3. The tension automatic switching of the strip steel over-flattening machine adopts different interval control process descriptions according to the positive or negative value of the tension variable quantity before and after strip steel:
2. when the threshold values calculated by the formula (5) and the formula (6) are smaller than a K5 value, the tension switching of the temper mill is automatically switched and controlled by a B time point calculated by the formula (12), the slope of the inlet tension switching is controlled by the calculated value of the formula (3), and the slope of the outlet tension switching is controlled by the calculated value of the formula (4).
When the threshold value 5KN calculated by the formula (5) and the formula (6) is smaller than the K5 value (20 KN), the tension switching of the temper mill is automatically switched and controlled by a B time point (40.4) calculated by the formula (12), the slope of the inlet tension switching is controlled by the calculated value 0.1875KN/SCAN of the formula (3), and the slope of the outlet tension switching is controlled by the calculated value 0.1875KN/SCAN of the formula (4).
2. When the threshold value calculated by the formula (5) and the formula (6) is larger than a value K5 and the current tension value is smaller than the tension SET value of the next roll, the inlet tension of the temper mill is switched to the inlet tension intermediate SET value (SPM _ ETEN _ SET _ M) calculated by the formula (7) at the time point A calculated by the formula (11), and then is automatically switched to the inlet tension SET value (SPM _ ETEN _ SET _ N) of the next roll at the time point B calculated by the formula (12). When the outlet tension of the temper mill is switched to the A time point calculated by the formula (11), firstly, the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8) is switched to, then, when the B time point calculated by the formula (12) is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the next roll of inlet tension, the slope of the inlet tension switching is controlled by the calculated value of the formula (3), and the slope of the outlet tension switching is controlled by the calculated value of the formula (4).
3. When the threshold value calculated by the formula (5) and the formula (6) is larger than a K5 value and the current tension value is larger than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the B time point calculated by the formula (12), the outlet tension is firstly switched to the middle SET value (SPM _ DTEN _ SET _ M) calculated by the formula (8), and then the outlet tension is automatically switched to the next roll outlet tension SET value (SPM _ DTEN _ SET _ N) at the C time point calculated by the formula (13).
When the tension of the outlet of the temper mill is switched to the B time point calculated by the formula (12), the tension is firstly switched to the intermediate SET value (SPM _ DTEN _ SET _ M) of the inlet tension calculated by the formula (8), and then the tension is automatically switched to the SET value (SPM _ DTEN _ SET _ N) of the inlet tension of the next roll at the C time point calculated by the formula (13).
The slope of the inlet tension switching is controlled by the calculated value of formula (3), and the slope of the outlet tension switching is controlled by the calculated value of formula (4).
Specifically, when the threshold value (50 KN) calculated by the formula (5) and the formula (6) has a value larger than K5 (20 KN) and the current tension value is larger than the tension SET value of the next roll, when the inlet tension of the temper mill is switched to the B time point (40.4M) calculated by the formula (12), the outlet tension intermediate SET value (SPM _ DTEN _ SET _ M) 55KN calculated by the formula (8) is firstly switched to, and then when the C time point (43.4M) calculated by the formula (13) is automatically switched to the outlet tension SET value (SPM _ DTEN _ SET _ N) 30KN of the next roll.
When the outlet tension of the temper mill is switched to the B time point calculated by the formula (12), the outlet tension is firstly switched to the inlet tension intermediate SET value (SPM _ DTEN _ SET _ M) 60KN calculated by the formula (8), and then the outlet tension of the temper mill is automatically switched to the next roll inlet tension SET value (SPM _ DTEN _ SET _ N) 35KN at the C time point calculated by the formula (13).
The slope of the inlet tension switching is controlled by calculating 1.875KN/SCAN according to a formula (3), and the slope of the outlet tension switching is controlled by calculating 1.875KN/SCAN according to a formula (4).
According to the technical scheme, a tension amplitude limiting model with the strip steel sectional area as an independent variable is established, a mode of respectively controlling the inlet tension and the outlet tension of a temper mill is adopted, meanwhile, a control mode of automatically switching between instant tension and interval tension of a strip steel welding seam over-temper mill is adopted, the tension of the strip steel welding seam over-temper mill is automatically switched to a positive value or a negative value according to the tension variation quantity of the strip steel in front and at the back, and different interval control modes are adopted, so that the requirement of process control can be better met, the yield of a unit is improved, the labor intensity of an operator is reduced, the strip steel breakage accident of the unit temper mill is avoided, and the product yield of the unit is improved.
The invention can be widely applied to the field of tension control when the strip steel welding seam passes through the leveling equipment in the rolling process.
Claims (3)
1. A control method for tension switching of strip steel welding line over-flattening equipment comprises the steps of detecting the tension of current coiled strip steel at an inlet and an outlet of a flattening machine, and is characterized in that:
1) Collecting parameters of a current coil of strip steel and a next coil of strip steel;
2) Establishing a tension amplitude limiting model taking the current coil strip steel sectional area as an independent variable;
3) Judging whether any threshold value of an inlet tension switching threshold value SPM _ ETEN _ CHG or an outlet tension switching threshold value SPM _ DTEN _ CHG of the temper mill is smaller than a tension switching threshold value K5; if not, executing the step 4); if yes, executing the step 5);
4) Tension switching of the temper mill adopts a 'B point instantaneous switching mode' to carry out automatic switching control; then, the step 8) is executed;
the 'B-point instantaneous switching mode' includes:
4.1 Time point B) is calculated according to the following formula:
automatically switching and controlling a moment point SPM _ TRK _ LEN _ B = strip steel tracking calculation length SPM _ TRK _ LEN when a strip steel welding seam passes through a welding seam detector by tension of the temper mill;
4.2 Tension switching of the temper mill is automatically switched and controlled by the point B calculated in the step 4.1);
4.3 The slope of the leveler inlet tension switch is calculated according to the following equation:
planisher inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (planisher inlet tension SET value SPM _ ETEN _ SET-planisher inlet tension feedback value SPM _ ETEN _ FBK) — planisher CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — planisher inlet tension switching coefficient K3;
4.4 The slope of the temper mill exit tension switch is calculated according to the following equation:
the leveler outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (leveler outlet tension SET value SPM _ DTEN _ SET-leveler outlet tension feedback value SPM _ DTEN _ FBK) the leveler CPU SCAN time R _ COM _ RAMP _ SET _ SCAN the leveler outlet tension switching coefficient K4;
4.5 According to the calculated result, controlling the tension switching slope of the inlet of the leveler and the tension switching slope of the outlet of the leveler;
5) Judging whether the tension set value of the current strip steel roll is smaller than the tension set value of the next strip steel roll; if yes, executing the step 6); if not, executing the step 7);
6) The tension switching of the temper mill adopts an A-B interval switching mode to carry out automatic switching control; then executing the step 8);
the "A-B interval switching mode" includes:
6.1 Time point a) is calculated according to the following formula:
the length SPM _ TRK _ LEN _ A of the tension automatic switching control point A = the length SPM _ TRK _ LEN _ B of the tension automatic switching control point B-the length K9 from the strip steel welding line to the center of the temper mill;
6.2 Time point B) is calculated according to the following formula:
automatically switching and controlling the length SPM _ TRK _ LEN _ B of a moment point B of the tension of the temper mill, namely calculating the length SPM _ TRK _ LEN by band steel tracking when a band steel weld passes through a weld detector;
6.3 When the inlet tension of the temper mill is switched at the time point A, the inlet tension is firstly switched to an intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension, and then the inlet tension is automatically switched to a SET value SPM _ ETEN _ SET _ N of the inlet tension of the next coil of strip steel at the time point B;
wherein, the intermediate inlet tension SET value SPM _ ETEN _ SET _ M = (the SET value SPM _ DTEN _ SET _ C of the inlet tension of the current strip coil of the temper mill-the SET value SPM _ DTEN _ SET _ N of the next coil of the temper mill)/the intermediate inlet tension SET value switching coefficient K6 of the temper mill;
6.4 When the outlet tension of the temper mill is switched at the time point A, the outlet tension is firstly switched to an intermediate SET value SPM _ DTEN _ SET _ M of the outlet tension, and then the outlet tension is automatically switched to a SET value SPM _ DTEN _ SET _ N of the outlet tension of the next coil of strip steel at the time point B;
wherein, the outlet tension intermediate SET value SPM _ DTEN _ SET _ M = (current outlet tension SET value SPM _ DTEN _ SET _ C-next coil outlet tension SET value SPM _ DTEN _ SET _ N of the temper mill)/temper mill outlet tension intermediate SET value switching coefficient K7;
6.5 The slope of temper mill inlet tension switching is controlled by calculating a value according to the following formula:
planisher inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (planisher inlet tension SET value SPM _ ETEN _ SET-planisher inlet tension feedback value SPM _ ETEN _ FBK) — planisher CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — planisher inlet tension switching coefficient K3;
6.6 The slope of the temper mill exit tension switch is controlled by calculating a value according to the following formula:
the temper mill outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (temper mill outlet tension SET value SPM _ DTEN _ SET-temper mill outlet tension feedback value SPM _ DTEN _ FBK) — the temper mill CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — temper mill outlet tension switching coefficient K4;
7) Tension switching of the temper mill is automatically switched and controlled by adopting a B-C interval switching mode; then, the step 8) is executed;
the 'B-C interval switching mode' comprises the following steps:
7.1 Time point B) is calculated according to the following formula:
automatically switching and controlling the length SPM _ TRK _ LEN _ B of a moment point B of the tension of the temper mill, and calculating the length SPM _ TRK _ LEN by tracking the strip steel when the strip steel weld passes through a weld detector;
7.2 Time point C) is calculated according to the following formula:
the length SPM _ TRK _ LEN _ C = the length SPM _ TRK _ LEN _ B + the length K10 from the strip steel welding seam to the center of the temper mill;
7.3 When the inlet tension of the temper mill is switched at a time point B, the inlet tension is firstly switched to an intermediate SET value SPM _ ETEN _ SET _ M of the inlet tension, and then the inlet tension is automatically switched to a next roll of outlet tension SET value SPM _ ETEN _ SET _ N at a time point C;
wherein, the intermediate inlet tension SET value SPM _ ETEN _ SET _ M = (current inlet tension SET value SPM _ ETEN _ SET _ C-next roll of inlet tension SET value SPM _ ETEN _ SET _ N of the temper mill)/intermediate inlet tension SET value switching coefficient K6 of the temper mill;
7.4 When the tension of the outlet of the temper mill is switched at a time point B, the tension is firstly switched to an intermediate SET value SPM _ DTEN _ SET _ M of the outlet tension, and then the tension is automatically switched to a next roll of SET value SPM _ DTEN _ SET _ N of the inlet tension at a time point C;
the outlet tension intermediate SET value SPM _ DTEN _ CHG _ M = (the current outlet tension SET value SPM _ DTEN _ SET _ C of the temper mill-the next coil outlet tension SET value SPM _ DTEN _ SET _ N of the temper mill)/the temper mill outlet tension intermediate SET value switching coefficient K7;
7.5 The slope of temper mill inlet tension switching is controlled by calculating a value according to the following formula:
planisher inlet tension switching slope SPM _ EENT _ RAMP _ SET = ABS (planisher inlet tension SET value SPM _ ETEN _ SET-planisher inlet tension feedback value SPM _ ETEN _ FBK) — planisher CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — planisher inlet tension switching coefficient K3;
7.6 The slope of the temper mill exit tension switch is controlled by calculating a value according to the following formula:
the temper mill outlet tension switching slope SPM _ DENT _ RAMP _ SET = ABS (temper mill outlet tension SET value SPM _ DTEN _ SET-temper mill outlet tension feedback value SPM _ DTEN _ FBK) — the temper mill CPU SCAN time R _ COM _ RAMP _ SET _ SCAN — temper mill outlet tension switching coefficient K4;
8) Ending the switching control process of the welding line;
9) The next weld is ready to be switched.
2. The method as claimed in claim 1, wherein in said step 1), the parameters of the strip include at least a current thickness of the strip, a current width of the strip, a current temper mill entrance tension setting, a current temper mill exit tension setting, a next strip thickness, a next strip width, a temper mill entrance tension setting of the next strip, and a temper mill exit tension setting of the next strip.
3. The method for controlling tension switching of the strip steel weld overpolishing device according to claim 1, wherein in the step 2), the tension amplitude limiting model using the current coil steel cross section as an independent variable comprises calculation of an inlet tension setting amplitude limit of the leveler, calculation of an outlet tension setting amplitude limit of the leveler, calculation of an inlet tension switching slope of the leveler and calculation of an outlet tension switching slope of the leveler.
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| JPS59147707A (en) * | 1983-02-14 | 1984-08-24 | Nippon Kokan Kk <Nkk> | Method for controlling tension of mandrel mill |
| JPH08309419A (en) * | 1995-05-11 | 1996-11-26 | Sumitomo Metal Ind Ltd | Method for controlling tension in tandem mill for bar for tubing |
| CN101658869A (en) * | 2008-08-25 | 2010-03-03 | 鞍钢股份有限公司 | Technique for continuously and flatly rolling welding seams of cold-rolled sheets |
| CN102485364A (en) * | 2010-12-01 | 2012-06-06 | 上海宝信软件股份有限公司 | Tension stabilizing control method and device for leveling machine |
| CN109940048A (en) * | 2019-04-04 | 2019-06-28 | 飞马智科信息技术股份有限公司 | A kind of skin pass mill tension control method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147707A (en) * | 1983-02-14 | 1984-08-24 | Nippon Kokan Kk <Nkk> | Method for controlling tension of mandrel mill |
| JPH08309419A (en) * | 1995-05-11 | 1996-11-26 | Sumitomo Metal Ind Ltd | Method for controlling tension in tandem mill for bar for tubing |
| CN101658869A (en) * | 2008-08-25 | 2010-03-03 | 鞍钢股份有限公司 | Technique for continuously and flatly rolling welding seams of cold-rolled sheets |
| CN102485364A (en) * | 2010-12-01 | 2012-06-06 | 上海宝信软件股份有限公司 | Tension stabilizing control method and device for leveling machine |
| CN109940048A (en) * | 2019-04-04 | 2019-06-28 | 飞马智科信息技术股份有限公司 | A kind of skin pass mill tension control method |
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