CN116532474A - Interlocking control method for preventing steel from being held in high-speed area equipment - Google Patents

Abstract

The invention discloses an interlocking control method for preventing steel suffocation in equipment in a high-speed area. The distance between two units is measured, and the outlet line speed of the penultimate rolling mill of the previous unit and the elongation coefficient of the last rolling mill of the previous unit are calculated. Calculate the exit line speed of the last stand rolling mill of the previous unit, calculate the running time from the previous unit to the next unit Honggang through the distance between the two units and the exit line speed of the last stand rolling mill of the previous unit, and calculate the control time of Honggang steel holding , compare the actual running time of Honggang with the control time of Honggang to judge whether there will be steel in advance. The invention can break the red steel before the red steel damages the roll ring, controls the steel holding before the equipment may be damaged, and effectively prevents the damage of the rolling mill.

Description

A chain control method for preventing steel suffocation in equipment in high-speed areas

technical field

The invention relates to a chain control method, in particular to a chain control method for preventing steel from being held up in equipment in a high-speed zone, and belongs to the technical field of steel rolling.

Background technique

The high-speed bar strip line has advanced equipment, high precision, fast rolling speed, long production line and many equipments in the high-speed area. If the steel is held back, it will take a long time to deal with it, and it will damage the equipment in addition. The high-speed bar production line has a high degree of automation, and has high requirements for the accuracy of signals, especially thermal detection signals. At present, most of the signals for holding steel are whether the fishing line in the box inside the unit equipment is broken. When the red steel comes out of the roller table, it will burn the fishing line, and then provide a signal for breaking and cutting to break. This is the commonly used signal for handling steel-holding accidents. But in fact, the signal is not beneficial to the equipment, and cannot achieve the effect of protecting the equipment. Steel holding occurs in the rolling mill unit, which will scald roll rings and other equipment (two roll rings for each rolling mill, and a unit usually has 2-6 rolling mills), resulting in large losses.

Contents of the invention

The technical problem to be solved by the present invention is to provide a chain control method for preventing steel holding in equipment in high-speed areas, and to control steel holding before possible damage to equipment.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A chain control method for preventing steel suffocation in equipment in a high-speed zone, characterized in that it includes the following steps:

S1. Measure the distance S between the last rolling mill of the previous unit and the first rolling mill of the next unit;

S2. Obtain the exit line speed v _n-1 of the penultimate rolling mill of the previous unit, and the elongation coefficient q of the last rolling mill of the previous unit;

S3. Calculate the exit linear velocity v n =V _n-1 *q of the last stand rolling mill of the previous unit through the exit line speed v _n-1 of the penultimate rolling mill of the previous unit and the elongation coefficient _q of the last stand rolling mill of the previous unit;

S4. Calculate the running time t ₀ =S from the previous unit to the next unit by the distance S between the last rolling mill of the previous unit and the first rolling mill of the latter unit and the exit line speed v _n of the last mill of the previous unit /V _n ;

S5. Calculate the control time t ₁ =t ₀ *p of the red steel by calculating the running time t ₀ of the red steel from the previous unit to the next unit red steel, where p is an empirical correction coefficient;

S6. The last rolling mill of the previous unit bites the steel at t ₂ , the first rolling mill of the next unit bites at t ₃ , and the current running time of the red steel is t ₄ , then the actual running time of the red steel is t ₅ =t ₄ -t ₂ ;

S7. Comparing the actual running time t ₅ of the red steel with the control time t ₁ of the red steel, if t ₅ ≥ t ₁ , it is determined that the steel is held between the two units, and the block between the units cuts the red steel, if t ₅ < t ₁ , the steel is normal.

Further, the distance S between the last rolling stand of the previous unit and the first rolling mill of the next unit in the step S1 is the transmission distance of red steel between the last rolling mill of the previous unit and the first rolling mill of the next unit.

Further, in the step S2, the elongation coefficient q of the last stand of the previous group is directly obtained from the rolling parameter table, or the rolling cross-sectional area s _{n-1 of the} penultimate stand of the previous group and the last The elongation coefficient q= s _n-1 /s _n is calculated from the rolling cross-sectional area s _n of the stand rolling mill.

Further, in the step S5, when the red steel is rolling, record the actual running time t of the red steel that does not produce steel when rolling from the previous unit to the next unit without steel red steel. ₆ = t ₃ -t ₂ , through the actual running time t ₆ of the unstrained red steel from the previous unit to the next unit recorded by multiple sets, and establish the actual running time data set of the unstrained red steel, for the unstrained red steel The actual running time data set is screened to remove impurities, and then the empirical correction coefficient p is determined according to the data distribution of the unsteeled steel red steel actual running time data set.

Further, in the step S7, the way to obtain the moment _t2 of the last stand rolling mill of the previous unit and the moment _t3 of the first stand rolling mill of the following unit is to energize the rolls of the last stand rolling mill of the previous unit, When the last rolling mill of the previous unit bites the steel, the rolls are conducted, and the current rises suddenly. This moment is recorded as the steel biting time t ₂ of the last rolling mill of the previous unit. When the first rolling mill of the latter unit bites the steel, the rolls are conducted, and the current rises suddenly, and this moment is recorded as the steel biting time t ₃ of the first rolling mill of the latter unit.

Compared with the prior art, the present invention has the following advantages and effects: the present invention provides a chain control method for preventing steel from being held up in the equipment in the high-speed zone. Judgment between runs, so as to judge whether there will be steel holding. Because steel holding is usually due to reasons such as red steel warping, when steel holding occurs, due to red steel warping, the actual running time will be longer than the theoretical running time , in order to determine whether steel holding will occur, the red steel can be broken before the red steel damages the roll ring, and the steel holding can be controlled before the equipment may be damaged, effectively preventing the damage of the rolling mill.

Description of drawings

Fig. 1 is a flow chart of an embodiment of a chain control method for preventing steel suffocation in high-speed zone equipment according to the present invention.

Detailed ways

In order to explain in detail the technical solutions adopted by the present invention to achieve the intended technical purpose, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described implementation Examples are only part of the embodiments of the present invention, rather than all embodiments, and, on the premise of not paying creative work, the technical means or technical features in the embodiments of the present invention can be replaced, the following will refer to the accompanying drawings and combine Examples illustrate the present invention in detail.

As shown in Fig. 1, a kind of interlocking control method of the present invention that prevents steel from being held back in the equipment in the high-speed zone comprises the following steps:

S1. Measure the distance S between the last rolling mill of the previous unit and the first rolling mill of the latter unit. The distance S between the last rolling mill of the previous unit and the first rolling mill of the next unit is the red steel transmission distance between the last rolling mill of the previous unit and the first rolling mill of the latter unit.

S2. Obtain the exit line velocity v _n-1 of the penultimate rolling stand of the previous unit, and the elongation coefficient q of the last rolling mill of the previous unit. The elongation coefficient q of the last stand rolling mill of the previous unit is directly obtained from the rolling parameter table, or calculated from the rolling cross-sectional area s _n-1 of the penultimate rolling mill of the previous unit and the rolling cross-sectional area s _n of the last stand of the previous unit Out extension coefficient q=s _n-1 /s _n .

S3. Calculate the final rolling mill exit velocity v n =V _n-1 *q _of the previous unit based on the exit linear velocity v _{n-1 of} the penultimate rolling mill of the previous unit and the elongation coefficient q of the last rolling mill of the previous unit.

S4. Calculate the running time t ₀ =S from the previous unit to the next unit by the distance S between the last rolling mill of the previous unit and the first rolling mill of the latter unit and the exit line speed v _n of the last mill of the previous unit /V _n .

S5. According to the running time t ₀ of Honggang from the previous unit to the next unit, calculate the control time t ₁ =t ₀ *p of Honggang, where p is the empirical correction coefficient.

The process of obtaining the empirical correction coefficient p is as follows: when the red steel is rolling, record the actual running time t of the red steel that does not produce steel when it is rolled from the previous unit to the next unit without steel ₆ = t ₃ -t ₂ , through the actual running time t ₆ of the unstrained red steel from the previous unit to the next unit recorded by multiple sets, and establish the actual running time data set of the unstrained red steel, for the unstrained red steel The actual running time data set is screened to remove impurities to remove invalid data with obvious excessive errors, and then the empirical correction coefficient p is determined according to the data distribution of the actual running time data set of unsteeled red steel.

S6. The last rolling mill of the previous unit bites the steel at t ₂ , the first rolling mill of the next unit bites at t ₃ , and the current running time of the red steel is t ₄ , then the actual running time of the red steel is t ₅ =t ₄ -t ₂ .

S7. Comparing the actual running time t ₅ of the red steel with the control time t ₁ of the red steel, if t ₅ ≥ t ₁ , it is determined that the steel is held between the two units, and the block between the units cuts the red steel, if t ₅ < t ₁ , the steel is normal.

The way to obtain the time t ₂ of the last mill stand of the previous unit and the moment t ₃ of the first mill stand of the next unit is to energize the rolls of the last mill stand of the previous unit, and when the last mill of the previous unit bites steel , the conduction between the rolls, the current rises suddenly, this moment is recorded as the steel bite time t ₂ of the last rolling mill of the previous unit, the rolls of the first rolling mill of the latter unit are energized, when the first rolling mill of the latter unit bites steel , the conduction between the rolls, the current rises suddenly, this moment is recorded as the moment t ₃ of the first rolling mill of the next unit.

The invention provides a chain control method for preventing steel suffocation in high-speed zone equipment, and judges whether steel suffocation will occur by judging the actual running time and theoretical operation of red steel between two sets of rolling mill units , because the suffocation of the steel is usually due to the red steel head warping and other reasons. When the steel suffocation occurs, the actual running time will be longer than the theoretical running time due to the bending of the red steel head. The red steel is broken before the ring, and the steel is controlled before the equipment may be damaged, which effectively prevents the damage of the rolling mill.

The present invention will be further described below through specific examples.

A chain control method for preventing steel from being held in equipment in a high-speed zone, which is used in the production of Φ12mm HRB400 straight rebar, comprising the following steps:

Measure the distance between the last rolling mill of the previous unit and the first rolling mill of the next unit, and according to the accurate distance on the process layout diagram, the 17 rolling mills (i.e. the last rolling mill) of the pre-finishing rolling unit are exported to the 2p unit of the Meier rolling mill (by two The distance between the first rolling mills consisting of rolling stands is (36.391m-12.803m)+12.803/sin65°=48. The distance between the last stand of Mel Mill 2p unit and the first mill stand of Mel Mill 4p unit is 118.2m.

Through the rolling parameter table, calculate the red steel movement time from the previous unit to the next unit under the normal process line speed, the exit speed of the 17 rolling mills is 16.22m/s, and the exit speed of the 2p unit of the Mel rolling mill is 25.4m/s , taking into account the large impact of stacking (the distance between units is long), the correction coefficient is added based on experience. The correction coefficient between the last 17 stands of the pre-finishing rolling mill and the 2p mill of the Meier rolling mill is 1.03, and the movement time of red steel is corrected to 48.7m /16.22/1.03=2915ms, the correction coefficient between the 2p unit of the Mel rolling mill and the 4p unit of the Mel rolling mill is 1.07, and the movement time between the 2p unit of the Mel rolling mill and the 4p unit of the Mel rolling mill is corrected to 118.2/25.4/1.07=4349ms.

Several important signals, the steel bite signal of the last unit of the unit (the current suddenly rises after the steel bite), the steel bite signal of the first unit of the next unit (the current suddenly rises after the steel bite), the jamming and shearing signal (one is the main console Forced breaking, and the time interval between biting steel exceeds the set time). The actual running time t _5a of the red steel between the last stand 17 of the pre-finishing rolling mill and the 2p unit of the meier mill, and the actual running time t _5b of the red steel between the 2p unit of the meier mill and the 4p unit of the meier mill.

When t _5a ≥ 2915ms, the red steel between the last stand 17 of the pre-finishing rolling mill and the 2p unit of the Meyer mill is cut and broken. When the steel-cracking signal of the first stand of the 2p unit of the Meyer rolling mill is collected, the red steel passes normally between the last 17 stands of the pre-finishing rolling mill and the 2p unit of the Meyer rolling mill.

When t _5b ≥ 4349ms, the block shear between Mel Mill 2p unit and Mel Mill Mill 4p unit works to break the red steel between Mel Mill Mill 2p unit and Mel Mill Mill 4p unit. When the steel-cracking signal of the first frame of the 4p unit of the Mel rolling mill is collected, the red steel passes through the steel normally between the 2p unit of the Mel rolling mill and the 4p unit of the Mel rolling mill.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, according to the technical content of the present invention Within the spirit and principles of the present invention, any simple modifications, equivalent replacements and improvements made to the above embodiments still fall within the scope of protection of the technical solutions of the present invention.

Claims (5)

1. A chain control method for preventing steel from being held back in high-speed zone equipment, characterized in that it comprises the following steps: S1. Measure the distance S between the last rolling mill of the previous unit and the first rolling mill of the next unit; S2. Obtain the exit line speed v _n-1 of the penultimate rolling mill of the previous unit, and the elongation coefficient q of the last rolling mill of the previous unit; S3. Calculate the exit linear velocity v n =V _n-1 *q of the last stand rolling mill of the previous unit through the exit line speed v _n-1 of the penultimate rolling mill of the previous unit and the elongation coefficient _q of the last stand rolling mill of the previous unit; S4. Calculate the running time t ₀ =S from the previous unit to the next unit by the distance S between the last rolling mill of the previous unit and the first rolling mill of the latter unit and the exit line speed v _n of the last mill of the previous unit /V _n ; S5. Calculate the control time t ₁ =t ₀ *p of the red steel by calculating the running time t ₀ of the red steel from the previous unit to the next unit red steel, where p is an empirical correction coefficient; S6. The last rolling mill of the previous unit bites the steel at t ₂ , the first rolling mill of the next unit bites at t ₃ , and the current running time of the red steel is t ₄ , then the actual running time of the red steel is t ₅ =t ₄ -t ₂ ; S7. Comparing the actual running time t ₅ of the red steel with the control time t ₁ of the red steel, if t ₅ ≥ t ₁ , it is determined that the steel is held between the two units, and the block between the units cuts the red steel, if t ₅ < t ₁ , the steel is normal. 2. A chain control method for preventing steel suffocation in high-speed zone equipment according to claim 1, characterized in that: the distance S between the last rolling mill of the previous unit and the first rolling mill of the next unit in the step S1 It is the transmission distance of red steel between the last rolling mill of the previous unit and the first rolling mill of the latter unit. 3. A chain control method for preventing steel suffocation in high-speed zone equipment according to claim 1, characterized in that: in the step S2, the elongation coefficient q of the last stand rolling mill of the previous unit is directly obtained through the rolling parameter table , or calculate the elongation coefficient q= s _n-1 /s _n from the rolling cross-sectional area s _n-1 of the penultimate rolling mill of the previous unit and the rolling cross-sectional area s _n of the last rolling mill of the previous unit. 4. A chain control method for preventing steel suffocation in high-speed zone equipment according to claim 1, characterized in that: in the step S5, the process of obtaining the empirical correction coefficient p is: when the red steel is rolled , record the actual running time t ₆ = t ₃ -t ₂ of each red steel that has not produced simmering steel during rolling from the previous unit to the next unit without simmering red steel, through multiple sets of records from the previous unit to the next unit The actual running time of the unsimmered red steel of the latter unit is _t6 and the actual running time data set of the unstrained red steel is established, and the data set of the actual running time of the unstrained red steel is screened to remove impurities, and then according to the The data distribution of the actual running time data set determines the empirical correction coefficient p. 5. A chain control method for preventing steel suffocation in equipment in the high-speed zone according to claim 1, characterized in that: in the step S7, the last mill stand of the previous unit bites the steel time t ₂ and the first unit of the next unit The way to obtain the time _t3 of the rolling mill bite time is: electrify the rolls of the last stand rolling mill of the previous unit, when the last stand rolling mill of the previous unit bites steel, the conduction between the rolls, the current suddenly rises, and this moment is recorded as the previous At the moment t ₂ of the last rolling mill of one unit biting the steel, the rolls of the first rolling mill of the latter unit are energized. The moment t ₃ for the first rolling mill of a unit to bite steel.