CN112222200A - Automatic error judgment control method for steel coil data of temper mill - Google Patents
Automatic error judgment control method for steel coil data of temper mill Download PDFInfo
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- CN112222200A CN112222200A CN202011034762.5A CN202011034762A CN112222200A CN 112222200 A CN112222200 A CN 112222200A CN 202011034762 A CN202011034762 A CN 202011034762A CN 112222200 A CN112222200 A CN 112222200A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention discloses a steel coil data automatic error judgment control method of a temper mill unit in the field of steel coil production technology, which comprises the following steps: the method comprises the steps of firstly determining a calculation module, utilizing running dynamic data of partial equipment of a main transmission and an uncoiler in a PLC control program as a basis for judging input errors of two key data of the diameter of an inlet and outlet steel coil and the thickness of strip steel to calculate a Scale value, then adding an automatic parking function into a control module, judging whether the possibility of strip breakage exists or not by comparing a deviation value of the Scale value in a neutral speed constant speed state and the Scale value in a high speed state of a unit, starting the automatic parking function by the unit when the deviation value is more than or equal to 0.03, reducing the speed of the unit to zero before a physical strip breakage point arrives, and performing subsequent production after abnormal discharge, so that the strip breakage phenomenon caused by input errors of data is avoided, the smooth production is ensured, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of steel coil production processes, in particular to a steel coil data automatic error judgment control method for a temper mill.
Background
In the daily production of the leveling unit, the belt breakage is a common accident of the leveling unit, which affects the normal production of the unit, reduces the productivity and yield of the unit, causes the damage of equipment, and even causes the injury of personnel in the process of handling the belt breakage. The reason that the strip breakage of the temper mill is more than 90% is that the steel coil rolling data input errors comprise a steel strip thickness data input error, a steel coil diameter data input error and a deviation of the incoming material thickness from the actual value. The tracking analysis is carried out on the three main reasons, and the three main reasons all belong to a reason with different expression forms and the same phenomenon, namely, the high-speed strip falling and breaking caused by the wrong rolling data of the steel coil.
Disclosure of Invention
In order to solve the problem that the conventional temper mill set is easy to break, the invention aims to solve the technical problems that: the automatic error judgment control method for the steel coil data of the leveling unit can effectively avoid the problem of strip breakage of the leveling unit.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the automatic steel coil data error judgment control method for the temper mill set comprises the following steps of:
the method comprises the following steps of firstly, determining a calculation module, wherein part of equipment running dynamic data of a main transmission and an uncoiler are utilized in a PLC control program as a basis for judging two key data input errors of the diameter of an inlet steel coil and the thickness of strip steel, and the adopted calculation formula is as follows:
Scale＝Vmdr/Npor/(π×Dpor/1000)×Gpor
in the formula, Vmdr: linear speed of the main transmission, Npor: actual speed of uncoiler, Dpor: diameter of steel coil Gpor: the gear ratio of the uncoiler;
wherein D isporThe steel coil diameter is represented, the rolling dynamic residual coil diameter of the uncoiler comprises the basic value of the steel coil diameter and the thickness of the strip steel input before rolling, the residual coil diameter is dynamically calculated on the basis,the calculation formula is as follows:
Dpor＝D-Th×△Layer
in the formula, D: the uncoiler inputs the coil diameter, Th: the thickness of an input steel coil, delta Layer: the layer number change value of the steel coil;
step two, module operation control, including the following control processes:
a. increasing the unit from the minimum speed to the middle speed and automatically keeping the constant speed of the unit within a few seconds, wherein the calculation module carries out the first Scale value of the current steel coil and determines the value as Scale1, and meanwhile, the automatic parking function is started;
b. after the value is taken, the program automatically accelerates the unit to the highest speed, at the moment, the calculation module runs in real time, and the system calculates the coefficient deviation value Scale in real time;
c. when the coefficient deviation value of the real-time Scale and Scale1 is less than 0.02, the whole roll does not generate a stop signal until the rolling is finished; when the coefficient deviation value is more than or equal to 0.03, the unit automatically and normally stops, and the speed of the unit is reduced to zero before a physical belt breaking point arrives;
d. and (3) when the unit is stopped abnormally, the production side eliminates the strip steel tension, checks and checks the input steel coil data on a man-machine interaction picture, reactivates and transmits the modified steel coil data to the PLC system, then resumes the accelerated rolling, and the calculation module is used for calculating again and repeating the step c.
Further, in the step a of the module control process, the minimum speed of the unit is 30m/min, and the median speed is 300 m/min.
Further, in the step a of the module control process, the constant speed maintaining time of the unit is not less than 8s, and the value of the Scale1 is taken immediately after the unit finishes the constant speed.
Further, in the module control process, the automatic parking function is in an effective working state when the diameter of the residual coil of the uncoiler is higher than 850mm in the constant speed mode state, and the automatic parking function is cancelled when the diameter of the residual coil of the uncoiler is lower than 850mm or the speed is reduced.
The invention has the beneficial effects that: by programming a calculation module and a logic control module in a PLC control system and using a Scale value as a judgment basis, when the deviation value of the Scale1 in a constant speed state and the Scale in a high speed state is more than or equal to 0.03, the unit is automatically stopped, and the speed of the unit is reduced to zero before a physical tape breaking point arrives, so that the tape breaking phenomenon is avoided, the smooth production is ensured, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of the control principle of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention discloses a steel coil data automatic error judgment control method of a temper mill, which comprises the following steps:
the method comprises the following steps of firstly, determining a calculation module, wherein part of equipment running dynamic data of a main transmission and an uncoiler are utilized in a PLC control program as a basis for judging two key data input errors of the diameter of an inlet steel coil and the thickness of strip steel, and the adopted calculation formula is as follows:
Scale＝Vmdr/Npor/(π×Dpor/1000)×Gpor
in the formula, Vmdr: linear speed of the main transmission, Npor: actual speed of uncoiler, Dpor: diameter of steel coil Gpor: the gear ratio of the uncoiler;
wherein D isporThe method is characterized in that the steel coil diameter is represented and is the rolling dynamic residual coil diameter of the uncoiler, wherein the rolling dynamic residual coil diameter comprises a steel coil diameter basic value and strip steel thickness which are input before rolling, the residual coil diameter is dynamically calculated on the basis, and the calculation formula is as follows:
Dpor＝D-Th×△Layer
in the formula, D: the uncoiler inputs the coil diameter, Th: the thickness of an input steel coil, delta Layer: the layer number change value of the steel coil;
step two, module operation control, including the following control processes:
a. increasing the unit from the minimum speed to the middle speed and automatically keeping the constant speed of the unit within a few seconds, wherein the calculation module carries out the first Scale value of the current steel coil and determines the value as Scale1, and meanwhile, the automatic parking function is started;
b. after the value is taken, the program automatically accelerates the unit to the highest speed, at the moment, the calculation module runs in real time, and the system calculates the coefficient deviation value Scale in real time;
c. when the coefficient deviation value of the real-time Scale and Scale1 is less than 0.02, the whole roll does not generate a stop signal until the rolling is finished; when the coefficient deviation value is more than or equal to 0.03, the unit automatically and normally stops, and the speed of the unit is reduced to zero before a physical belt breaking point arrives;
d. and (3) when the unit is stopped abnormally, the production side eliminates the strip steel tension, checks and checks the input steel coil data on a man-machine interaction picture, reactivates and transmits the modified steel coil data to the PLC system, then resumes the accelerated rolling, and the calculation module is used for calculating again and repeating the step c.
The whole control process is shown in fig. 1, the calculation formula can reflect the situations of steel thickness data input errors and steel coil diameter data input errors to the Scale value, and the situation of data input errors can be analyzed by comparing the Scale value at the initial constant speed stage with the Scale value in the subsequent high-speed production process. According to a large amount of calculation verification, the broken belt mainly occurs in the high-speed operation stage of the unit, in the stage, the previous data errors are accumulated continuously, and when the coefficient deviation value of the current back Scale value is larger than or equal to 0.03, the steel belt has the risk of belt breakage. Therefore, an automatic shutdown function is added in the PLC control program, when the deviation value of the Scale coefficient is more than or equal to 0.03, the unit automatically and normally stops, the speed of the unit is reduced to zero before a physical strip breakage point arrives, and subsequent production is carried out after abnormal strip discharge, so that the steel strip can be prevented from being broken, and the production reliability is improved.
According to the fact that the highest actual linear speed of a main transmission is generally 700-800m/min when the currently common leveling unit works, in the step a of the module control process, the minimum speed of the unit is 30m/min, and the median speed is 300m/min, so that the method is suitable for most units. In addition, the constant speed holding time of the unit is not less than 8s, the value is very stable and accurate at this time, the accuracy of subsequent calculation is convenient to guarantee, and the Scale1 is preferably immediately taken after the unit finishes the constant speed.
When the rolling is about to finish, the speed of the unit is reduced, and Scale value change is caused, so that the automatic stopping function is started by mistake. Therefore, in the module control process, the automatic parking function is in an effective working state when the residual coil diameter of the uncoiler is higher than 850mm in the constant speed mode state, and the automatic parking function is cancelled when the residual coil diameter of the uncoiler is lower than 850mm or the speed is reduced. The 850mm is set according to the working requirement of the unit, and when the unit reaches the working degree, the unit approaches the tail sound, the speed is reduced, and the belt breakage phenomenon is avoided.
Claims (4)
1. The automatic error judgment control method for the steel coil data of the temper mill is characterized by comprising the following steps of:
the method comprises the following steps of firstly, determining a calculation module, wherein part of equipment running dynamic data of a main transmission and an uncoiler are utilized in a PLC control program as a basis for judging two key data input errors of the diameter of an inlet steel coil and the thickness of strip steel, and the adopted calculation formula is as follows:
Scale＝Vmdr/Npor/(π×Dpor/1000)×Gpor
in the formula, Vmdr: linear speed of the main transmission, Npor: actual speed of uncoiler, Dpor: diameter of steel coil Gpor: the gear ratio of the uncoiler;
wherein D isporThe method is characterized in that the steel coil diameter is represented and is the rolling dynamic residual coil diameter of the uncoiler, wherein the rolling dynamic residual coil diameter comprises a steel coil diameter basic value and strip steel thickness which are input before rolling, the residual coil diameter is dynamically calculated on the basis, and the calculation formula is as follows:
Dpor＝D-Th×△Layer
in the formula, D: the uncoiler inputs the coil diameter, Th: the thickness of an input steel coil, delta Layer: the layer number change value of the steel coil;
step two, module operation control, including the following control processes:
a. increasing the unit from the minimum speed to the middle speed and automatically keeping the constant speed of the unit within a few seconds, wherein the calculation module carries out the first Scale value of the current steel coil and determines the value as Scale1, and meanwhile, the automatic parking function is started;
b. after the value is taken, the program automatically accelerates the unit to the highest speed, at the moment, the calculation module runs in real time, and the system calculates the coefficient deviation value Scale in real time;
c. when the coefficient deviation value of the real-time Scale and Scale1 is less than 0.02, the whole roll does not generate a stop signal until the rolling is finished; when the coefficient deviation value is more than or equal to 0.03, the unit automatically and normally stops, and the speed of the unit is reduced to zero before a physical belt breaking point arrives;
d. and (3) when the unit is stopped abnormally, the production side eliminates the strip steel tension, checks and checks the input steel coil data on a man-machine interaction picture, reactivates and transmits the modified steel coil data to the PLC system, then resumes the accelerated rolling, and the calculation module is used for calculating again and repeating the step c.
2. The automatic error judgment control method for the steel coil data of the temper mill unit as claimed in claim 1, which is characterized in that: in the step a of the module control process, the minimum speed of the unit is 30m/min, and the median speed is 300 m/min.
3. The automatic error judgment control method for the steel coil data of the temper mill unit as claimed in claim 1, which is characterized in that: in the step a of the module control process, the constant speed keeping time of the unit is not less than 8s, and the value of the Scale1 is taken immediately after the unit finishes the constant speed.
4. The automatic error judgment control method for the steel coil data of the temper mill unit as claimed in claim 1, which is characterized in that: in the module control process, the automatic parking function is in an effective working state when the diameter of the residual coil of the uncoiler is higher than 850mm in a constant speed mode state, and the automatic parking function is cancelled when the diameter of the residual coil of the uncoiler is lower than 850mm or the speed is reduced.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579706A (en) * | 2009-06-19 | 2009-11-18 | 武汉钢铁(集团)公司 | Rewinding steel band broken belt protection control method |
| CN103658227A (en) * | 2012-08-31 | 2014-03-26 | 宝山钢铁股份有限公司 | Method for eliminating uncoiling length deviation of strip steel |
| CN104971950A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Automatic deceleration control method of tandem cold mill |
| CN105080967A (en) * | 2015-09-29 | 2015-11-25 | 山东钢铁股份有限公司 | Secondary rolling method of broken belt roll of single-rack reversible cold rolling mill |
-
2020
- 2020-09-27 CN CN202011034762.5A patent/CN112222200B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579706A (en) * | 2009-06-19 | 2009-11-18 | 武汉钢铁(集团)公司 | Rewinding steel band broken belt protection control method |
| CN103658227A (en) * | 2012-08-31 | 2014-03-26 | 宝山钢铁股份有限公司 | Method for eliminating uncoiling length deviation of strip steel |
| CN104971950A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Automatic deceleration control method of tandem cold mill |
| CN105080967A (en) * | 2015-09-29 | 2015-11-25 | 山东钢铁股份有限公司 | Secondary rolling method of broken belt roll of single-rack reversible cold rolling mill |
Non-Patent Citations (2)
| Title |
|---|
| 李江: "平整机组的断带与控制", 《四川冶金》 * |
| 赵树华: "四辊平整机高速断带电气分析与应用", 《中国新技术新产品》 * |
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