CN109954753B - Method for reducing quick-opening broken belt of acid continuous rolling tension leveler - Google Patents
Method for reducing quick-opening broken belt of acid continuous rolling tension leveler Download PDFInfo
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- CN109954753B CN109954753B CN201910171414.3A CN201910171414A CN109954753B CN 109954753 B CN109954753 B CN 109954753B CN 201910171414 A CN201910171414 A CN 201910171414A CN 109954753 B CN109954753 B CN 109954753B
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention discloses a method for reducing quick belt breakage of an acid continuous rolling tension leveler, which comprises the following steps: acquiring an opening distance compensation value, and determining an opening point of the tension leveler according to a preset opening position and the opening distance compensation value; and acquiring a closing distance compensation value, and determining a closing point of the tension leveler according to a preset closing position and the closing distance compensation value. According to the method for reducing the quick-opening broken belt of the acid continuous rolling tension leveler, the opening distance compensation value is used for compensating and correcting the opening point of the tension leveler, the closing distance compensation value is used for compensating and correcting the closing point of the tension leveler, so that the position of a welding line is positioned between the opening point of the tension leveler and the closing point of the tension leveler, the rolling at the position of the welding line is avoided, and the quick-opening broken belt probability of the acid continuous rolling tension leveler is effectively reduced.
Description
Technical Field
The invention relates to the technical field of steel strip rolling, in particular to a method for reducing quick strip opening and breaking of an acid continuous rolling tension leveler.
Background
The tension leveler is an important component in the acid continuous rolling unit and plays roles in breaking scales, extending steel plates and reducing acid loss in the acid pickling process. In the continuous rolling process, different coil steel strips are connected together in a welding mode, and the strength of a welding seam is weak. In order to avoid the strip breakage phenomenon, the tension leveler jumps over the welding seam area through a quick opening mode, namely, the tension leveler stops being used at the position close to the welding seam and is used after jumping over the welding seam area, so that the phenomenon that the steel coil is broken due to the fact that large stress is generated in the welding seam area is avoided.
The tension roller slightly slides with the steel coil when driving the steel coil to rotate, and the relative sliding between the tension roller and the steel coil is increased along with the production and the abrasion of the tension roller. The sour tandem rolling unit moves to coil of strip through the rotation number of turns that acquires the tension roller and trails the calculation and then acquires the welding seam position, and when the relative slip between tension roller and the coil of strip constantly increaseed, the deviation between welding seam actual position and the calculated value crescent gradually, and there is the deviation in the position that tension withdrawal and straightening machine carried out the fast-open mode under the guidance of calculated value and actual welding seam position, pushes down the welding seam easily, causes disconnected area. Therefore, there is a need for a method of reducing the quick belt breakage of an acid continuous rolling tension leveler.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for reducing quick belt breakage of an acid continuous rolling tension leveler. The specific technical scheme is as follows:
a method of reducing quick strip breakage in an acid continuous rolling tension leveler, the method comprising: acquiring an opening distance compensation value, and determining an opening point of a tension withdrawal and straightening machine according to a preset opening position and the opening distance compensation value; and acquiring a closing distance compensation value, and determining a closing point of the tension leveler according to a preset closing position and the closing distance compensation value.
In one possible design, the opening point of the tension withdrawal and straightening machine is located before the preset opening position, and the distance between the opening point of the tension withdrawal and straightening machine and the preset opening position is equal to the opening distance compensation value.
In one possible embodiment, the closing point of the tension leveler is located after the predetermined closing position, and the distance between the closing point of the tension leveler and the predetermined closing position is equal to the closing distance compensation value.
In one possible design, the opening distance compensation value is equal to the sum of the deviation compensation and the action time compensation.
In one possible design, the closing distance compensation value is equal to the deviation compensation.
In one possible design, the offset compensation is positively correlated to the offset value between the PLC calculated weld position and the actual weld position.
In one possible design, the actual weld position is determined by a weld detector, and the weld detector is connected with the PLC to acquire the actual weld position and send the actual weld position to the PLC.
In one possible design, when the deviation value is less than or equal to 500mm, the deviation compensation is 2 m; when the deviation value is more than 500mm and less than or equal to 1500mm, the deviation compensation is 6 m; when the deviation value is more than 1500mm and less than or equal to 2500mm, the deviation compensation is 10 m; when the deviation value is larger than 2500mm, the deviation compensation is 15 m.
In one possible design, the run time compensation is equal to the time group travel speed of the weld through the tension leveler multiplied by the straightening roll open time multiplied by the lubrication factor.
In one possible design, the lubrication factor is 2 to 5.
The technical scheme of the invention has the following main advantages:
according to the method for reducing the quick-opening broken belt of the acid continuous rolling tension leveler, the opening distance compensation value is used for compensating and correcting the opening point of the tension leveler, the closing distance compensation value is used for compensating and correcting the closing point of the tension leveler, so that the position of a welding line is positioned between the opening point of the tension leveler and the closing point of the tension leveler, the rolling at the position of the welding line is avoided, and the quick-opening broken belt probability of the acid continuous rolling tension leveler is effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flowchart of a method for reducing quick belt breakage of an acid continuous rolling tension leveler, according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a deviation value in a method for reducing quick-opening broken belts of an acid continuous rolling tension leveler according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a method for reducing a quick-open broken strip of an acid continuous rolling tension leveler, including:
and acquiring an opening distance compensation value, and determining an opening point of the tension leveler according to a preset opening position and the opening distance compensation value.
And acquiring a closing distance compensation value, and determining a closing point of the tension leveler according to a preset closing position and the closing distance compensation value.
In the running process of the acid continuous rolling tension leveler, a straightening roller of the tension leveler is opened at a preset opening position, and the rolling is stopped. And closing the rolling mill at a preset closing position, and restarting the rolling work. And when the actual position of the steel strip is not deviated from the position calculated by the PLC, the welding seam position is between the preset opening position and the preset closing position. In the rolling production process, along with the slippage of the steel strip, the deviation between the quick opening of the tension withdrawal and straightening machine and the actual welding seam position is generated according to the preset opening position and the preset closing position. The opening point of the tension leveler is compensated and corrected through the opening distance compensation value, the closing point of the tension leveler is compensated and corrected through the closing distance compensation value, the position of a welding line is located between the opening point of the tension leveler and the closing point of the tension leveler, rolling at the position of the welding line is avoided, and the probability of strip breakage of the acid continuous rolling tension leveler during quick opening is effectively reduced.
The opening point of the tension withdrawal and straightening machine is located in front of the preset opening position, and the distance between the opening point of the tension withdrawal and straightening machine and the preset opening position is equal to the opening distance compensation value. That is, after the opening distance compensation value is corrected, the tension leveler is opened in advance compared with the preset opening position before correction, the opening time of the straightening roll of the tension leveler is longer, and rolling at the position of a welding seam is avoided.
The closing point of the tension straightening machine is located behind the preset closing position, and the distance between the closing point of the tension straightening machine and the preset closing position is equal to the closing distance compensation value. Namely, after the closing distance compensation value is corrected, the tension leveler is closed after delay compared with the preset closing position before correction, the opening time of the straightening roller of the tension leveler is longer, and rolling at the position of a welding seam is avoided.
As to how the opening distance compensation value and the closing distance compensation value are acquired, the following is exemplified: the opening distance compensation value is equal to the sum of the deviation compensation and the action time compensation, and the closing distance compensation value is equal to the deviation compensation.
It can be appreciated that the offset compensation is positively correlated to the offset value between the PLC calculated weld position and the actual weld position. That is, the greater the deviation value between the weld position calculated by the PLC and the actual weld position, the greater the deviation compensation.
The steel band passes through the encoder etc. and acquires the rotation number of turns of tension roll under the rotation of tension roll, and then acquires steel band position and welding seam position, and the welding seam position that acquires through this mode is the welding seam position that PLC calculated, promptly, theoretical welding seam position.
Optionally, the actual position of the weld is determined by a weld detector, the weld detector is connected with the PLC, and the actual position of the weld is obtained and sent to the PLC.
The schematic diagram of the obtaining of the deviation value can be seen in fig. 2. In the figure, the welding position of the strip steel 1 and the strip steel 2 is a welding seam, a welding seam detector is arranged right above the steel strip to measure the actual welding seam position of the moving steel strip at a certain moment, the calculated welding seam in the figure represents the welding seam position calculated by a PLC, and the difference value between the two is a deviation value.
As shown in table one, when the deviation value is less than or equal to 500mm, the deviation compensation is 2 m; when the deviation value is more than 500mm and less than or equal to 1500mm, the deviation compensation is 6 m; when the deviation value is more than 1500mm and less than or equal to 2500mm, the deviation compensation is 10 m; when the deviation value is larger than 2500mm, the deviation compensation is 15 m.
Watch 1
For example, after one month of tension roller replacement, some measurement deviation value is 17840mm-17651 mm-189 mm, and 2m is taken for deviation compensation. After 6 months of replacement, the deviation value of one measurement is 18132mm-17625 mm-507 mm, and the deviation compensation is 6 m.
Since the tension leveler requires time to open during operation, the action time of the tension leveler needs to be considered when calculating the opening compensation value, and the action time compensation is, for example, equal to the running speed of the time group when the welding seam passes through the tension leveler multiplied by the opening time of the straightening roll multiplied by the lubrication coefficient. The running speed of the unit when the welding seam passes through the tension leveler is determined by the running attribute of the acid continuous rolling unit. The opening time of a straightening roller in the tension withdrawal and straightening machine is controlled by a PLC and is determined by the operation attribute of an acid continuous rolling unit. For example, for a certain acid continuous rolling unit, the opening time of the straightening roll is 12s, and the operation speed of the welding line passing through the tension leveler is 1 m/s.
The lubricating coefficient is 2-5, and it can be understood that the higher the lubricating degree is, the faster the opening speed of the straightening roll of the tension straightening machine is, and correspondingly, the smaller the compensation of the action time is. That is, the higher the degree of lubrication, the smaller the value of the lubrication coefficient. For example, in the first month after the lubricating oil is supplemented each time, the lubricating coefficient is 2, the lubricating coefficient is increased along with the increase of the month, the lubricating coefficient in the second month is 3, the lubricating coefficient in the third month is 4, and the like.
The following describes a specific implementation process of the method with reference to a specific example:
in the using process of a certain acid continuous rolling unit, the deviation compensation corresponding to the deviation value between the position of a welding line calculated by a PLC at a certain moment and the actual position of the welding line is 2m, the opening time of a straightening roller of a tension leveler is 12s, the running speed of the unit when the welding line passes through the tension leveler is 1m/s, the lubricating coefficient with good lubrication is 2, the action time compensation is calculated to be 12 x 1 x 2 x 24, namely, the deviation compensation in the time period is 2m, and the action time compensation is 24 m. The opening distance compensation value is equal to the sum of the deviation compensation and the action time compensation is 26m and the closing distance compensation value is equal to the deviation compensation is 2 m. That is, the tension leveler is opened 26m ahead and closed 2m behind during this period of time, compared to when no compensation is performed, to ensure that the weld is not rolled.
Before the method for reducing the quick-opening and strip-breaking of the acid continuous rolling tension leveler is not adopted, the strip-breaking accident happens twice per year on average, and the time for re-welding the steel strip and threading the steel strip is 8 hours. Acid continuous rolling is used for producing 6 steel coils per hour, each coil is 20 tons, the profit of each ton of steel is calculated by 300 yuan, and the loss profit is as follows: 2 × 6 × 20 × 300 × 8 ═ 576000 yuan. By adopting the method for reducing the quick belt breakage of the acid continuous rolling tension leveler, the profit can be increased by 57.6 ten thousand yuan each year.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for reducing quick-opening broken belts of an acid continuous rolling tension leveler is characterized by comprising the following steps:
acquiring an opening distance compensation value, and determining an opening point of a tension leveler according to a preset opening position and the opening distance compensation value, wherein the opening point of the tension leveler is positioned in front of the preset opening position, and the distance between the opening point of the tension leveler and the preset opening position is equal to the opening distance compensation value, the opening distance compensation value is equal to the sum of deviation compensation and action time compensation, and the action time compensation is equal to the product of the running speed of a welding seam passing through a tension leveler opportunity group multiplied by the opening time of a straightening roll multiplied by a lubrication coefficient;
acquiring a closing distance compensation value, and determining a closing point of a tension leveler according to a preset closing position and the closing distance compensation value, wherein the closing point of the tension leveler is positioned behind the preset closing position, and the distance between the closing point of the tension leveler and the preset closing position is equal to the closing distance compensation value, and the closing distance compensation value is equal to the deviation compensation;
and the deviation compensation is positively correlated with the deviation value between the welding seam position calculated by the PLC and the actual welding seam position.
2. The method for reducing the quick open and break strip of the acid continuous rolling tension leveler as recited in claim 1, wherein the actual weld joint position is determined by a weld joint detector, the weld joint detector is connected with the PLC, the actual weld joint position is obtained and sent to the PLC.
3. The method for reducing the quick belt breakage of an acid continuous rolling tension leveler as recited in claim 2, wherein the offset compensation is 2m when the offset value is less than or equal to 500 mm;
when the deviation value is more than 500mm and less than or equal to 1500mm, the deviation compensation is 6 m;
when the deviation value is more than 1500mm and less than or equal to 2500mm, the deviation compensation is 10 m;
when the deviation value is larger than 2500mm, the deviation compensation is 15 m.
4. The method for reducing the quick belt breakage of the acid continuous rolling tension leveler as recited in claim 1, wherein the lubrication factor is 2-5.
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| CN111185482A (en) * | 2020-01-15 | 2020-05-22 | 北京科技大学 | Stretch bending straightening mechanical system with over-weld self-adaptive function |
| CN111360077B (en) * | 2020-03-03 | 2022-07-15 | 首钢京唐钢铁联合有限责任公司 | Control method for preventing strip steel from throwing into acid tank |
| CN112474816B (en) * | 2020-11-16 | 2022-09-13 | 山西太钢不锈钢股份有限公司 | Method for correcting information of steel coil on line by acid continuous rolling |
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| JP3252751B2 (en) * | 1997-04-28 | 2002-02-04 | 住友金属工業株式会社 | Strip width control method in cold tandem rolling |
| JP2002113503A (en) * | 2000-10-10 | 2002-04-16 | Nkk Corp | Method for controlling load when welded joint part is passed through in continuous temper rolling of metallic strip |
| CN101332469B (en) * | 2007-06-28 | 2010-07-21 | 上海宝信软件股份有限公司 | Tension leveler control method |
| CN102172634B (en) * | 2010-12-30 | 2012-12-12 | 攀钢集团钢铁钒钛股份有限公司 | Method for rolling welding line under automatic control |
| CN104923568B (en) * | 2014-03-18 | 2017-05-31 | 宝山钢铁股份有限公司 | A kind of control method for preventing thin strip cold rolling process broken belt |
| CN203955774U (en) * | 2014-05-19 | 2014-11-26 | 北京佰能电气技术有限公司 | A kind of withdrawal straightening machine control device and system |
| CN105251776B (en) * | 2014-07-16 | 2017-05-24 | 鞍钢股份有限公司 | Tracking processing method for band steel on cold tandem mill |
| CN106424170B (en) * | 2016-09-28 | 2017-12-29 | 邯钢集团邯宝钢铁有限公司 | A kind of sour rolling mill tension leveler control method |
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