CN101003064A - Method for solving difficulty of looping tail at steel rolling production-line - Google Patents

Abstract

A method for preventing the loops from not containing the steel tail features that the load head signal of down stream rolling mill is used as the loop lifting command, the load tail signal of upstream rolling mill is used as the loop lowering command, and the load signal of the first rolling mill is directly used as the control signal of the loop lifters for the next three rolling mills.

Description

A kind of method that solves difficulty of looping tail at steel rolling production-line

Technical field

The present invention relates to a kind of method of control kink in the steel rolling production-line, belong to metallurgical technology field.

Background technology

Upright kink device is adopted in the production of Modern Small hot continuous rolling mostly, and its frame adopts lead frame, loop back roll air cylinder driven.The air cylinder driven rotating shaft swings up and down the loop back roll that is contained on the kink arm, makes rolled piece form kink.Cylinder is contained in more than the transmission side roll line, is convenient to maintenance and adjusts.Kink inlet, outlet all are provided with lower guide roll.The centre is provided with two independent roller-ways, plays the effect of transporting rolled piece.In the whole operation of rolling, rolled piece is stung steel by second finishing mill and is risen and be set to the rolled piece afterbody and deviate from last frame finishing mill, and overall process is carried out machine and controlled automatically.Each kink control device all is equipped with the kink scanner, is used to detect looper height, at any time to the controlling organization feedback information.General looper height numerical value is at 0～500mm.The kink scanner is as measuring transducer, and temperature is higher than the sensitive for infrared radiation of the hot rolling part of 250 ℃ (480 ), and its detects and is positioned at hot rolling part (steel, copper, alloy and the glass etc.) position of its field range and exports corresponding signal.The kink scanner can be exported the switching value signal that steel does not have steel simultaneously, and this signal can be used as the control command that the control kink plays cover and conforms to a conventional pattern.

At present, the kink control technology of steel rolling production-line generally adopts the looper height closed loop feedback to control automatically, by the speed of upstream milling train being carried out the speed governing of minus deviation automated closed-loop, realize the tension free rolling technology between the milling train of kink two ends from the position deviation of detected actual looper height of kink scanner and assigned altitute.Kink works the automatic control of overlapping and conforming to a conventional pattern generally two kinds, and a kind of is to utilize the steel signal that has of a kink to overlap order as rising of next frame kink, utilizes the conform to a conventional pattern order of the no steel signal of a kink as next frame kink.Another kind is to utilize the payload header of a last rolling mill to have the steel signal to overlap order as rising of next frame kink, utilizes last rolling mill load afterbody not have the conform to a conventional pattern order of steel signal as next frame kink.Wherein first method has had the cover time advantage accurately that conforms to a conventional pattern, but is subjected to the fault effects of kink scanner easily; Second method has the simple and practical advantage of control, and the time is not accurate enough but a cover conforms to a conventional pattern.

In rolling process, when steel rolling speed is higher, be higher than such as finisher speed under the situation of 12m/s, when the steel tail breaks away from the upstream frame of certain kink, the afterbody of steel can upwards get rid of rapidly under the acting in conjunction of rising of the moment of loop back roll and downstream frame pulling force because the pulling force of upstream frame suddenly disappears, and steel rolling speed is fast more, and this whipping action is fast more, sometimes the fierce whipping of steel tail can make the steel pintle on the kink frame, is broken by the downstream frame then.When next root steel rolls arrival, will pile the steel accident.When steel rolling speed is relatively low, such as being lower than 12m/s, difficulty of looping tail, breaking and pile the less generation of steel accident.Usually the method that solves the difficulty of looping tail problem all is that the control loop back roll conforms to a conventional pattern in advance, promptly when also breaking away from the upstream frame of certain kink, the steel tail just do not send the order that conforms to a conventional pattern to loop back roll, after kink fell, the steel tail just broke away from the upstream frame of this kink, so just the whipping problem can not take place.Usually such method is to utilize the method for corresponding delay program to control certain kink to conform to a conventional pattern in advance, but this method need design the logic control program of relative complex.

Summary of the invention

The present invention is used to overcome the defective of prior art and a kind of method that solves difficulty of looping tail at steel rolling production-line is provided.

The technical scheme that addresses the above problem is:

A kind of method that solves difficulty of looping tail at steel rolling production-line, the payload header of its employing milling train, tail signal are as the kink control signal, play the payload header signal of cover order from the downstream milling train, the order that conforms to a conventional pattern is from the load tail signal of upstream milling train, and carries out according to the following steps:

A. the load signal of first rolling mill is introduced directly in three kink device control interface circuit of first, second and third adjacent rolling mill of downstream as control signal;

B. successively the load signal of all the other upstream milling trains is introduced directly in the kink device control interface circuit between second and third adjacent rolling mill of downstream as control signal;

C. the reflection rolled piece afterbody that sends with the described upstream milling train trailing edge signal that do not have a steel signal is controlled the time of one～three rolling mill action that begins to conform to a conventional pattern in advance of downstream kink device simultaneously.

After adopting the present invention, just do not send the order that conforms to a conventional pattern to loop back roll when the steel tail also breaks away from the upstream frame of certain kink, after kink fell, the steel tail just broke away from the upstream frame of this kink, thereby had solved the difficulty of looping tail problem.This method can effectively reduce heap steel accident and equipment breakdown, reduces the useless rate of rolling, and improves the rate of becoming a useful person, and can also reduce time of casualty, improves effective operation efficient, improves output.

Description of drawings

Fig. 1 is the schematic layout pattern of milling train and kink among the present invention;

Fig. 2 is that kink scanner of the present invention detects the rolled piece schematic diagram;

Fig. 3 is a kink automatic control signal sequential chart of the present invention;

Fig. 4 is a kink automatic control flow chart block diagram of the present invention;

Fig. 5 is that milling train sky of the present invention is crossed and the automatic control logic switching flow of kink block diagram.

The mark implication is among Fig. 1: 1-2# cuts; The 2-13# milling train; The 3-14# milling train; The 4-14# milling train; The 5-16# milling train; The 6-17# milling train; The 7-18# milling train; 8-rolled piece rolling direction; The 9-3# kink; The 10-4# kink; The 11-5# kink; The 12-6# kink; The 13-7# kink; 14-kink scanner.

The mark implication is among Fig. 2: 21-kink scanner; 22-founds looper; The 23-rolled piece; 24-kink scanner detecting light beam; The kink that the 25-rolled piece forms.

The mark implication is among Fig. 3: A-13# mill load signal; The B-3# kink rises and overlaps the signal that conforms to a conventional pattern; C-14# mill load signal; The D-4# kink rises and overlaps the signal that conforms to a conventional pattern; E-14# mill load signal; The F-5# kink rises and overlaps the signal that conforms to a conventional pattern; G-16# mill load signal; The H-6# kink rises and overlaps the signal that conforms to a conventional pattern; I-16# mill load signal; The J-7# kink rises and overlaps the signal that conforms to a conventional pattern; K-17# mill load signal; The L-time-axis direction.

The specific embodiment

The load signal control downstream kink that the present invention utilizes the upstream milling train is the action that begins to conform to a conventional pattern of the time of one～three rolling mill in advance, thereby effectively solves the difficulty of looping tail problem.

One embodiment of the present of invention have a kink by 6 finishing mills and 5 steel rolling production-lines that kink is formed between per two finishing mills, are described as follows:

Fig. 1 is the milling train of steel rolling production-line mm finishing mill unit of this embodiment and the schematic layout pattern of kink.In not doing improved finish rolling process, mm finishing mill unit has 5 kinks to lay respectively between adjacent two milling trains, plays the payload header signal of cover order from the downstream milling train, promptly responds the rising edge of mill load signal.Conform to a conventional pattern order from the load tail signal of upstream milling train, promptly respond the trailing edge of mill load signal.When rolled piece is cut when nipping the 13# milling train through 1#, the 13# milling train can send the rising edge signal that the reflection workpiece front end has the steel signal, when rolled piece is nipped the 14# milling train, the 14# milling train can send the rising edge signal that the reflection workpiece front end has the steel signal, because all have rolled piece in 1# and the 14# milling train this moment, the workpiece front end of this 14# milling train has the rising edge signal of steel signal just as a cover order of 3# kink, the 3# kink plays cover thereupon, feedback adjusting constantly through 3# kink scanner, looper height is stabilized in very soon not to be had on the fixed height, finishes the tension free rolling between adjacent two rolling mills.When rolled piece broke away from the 13# milling train, the 13# milling train can send the trailing edge signal that reflection rolled piece afterbody does not have the steel signal, and just as the order that conforms to a conventional pattern of 3# kink, the 3# kink conforms to a conventional pattern this signal thereupon, has finished this control function of 3# kink.Equally, the automatic control of 2#, 3#, 4#, 7# kink also is like this.The whipping problem of kink when solving high speed steel rolling, the present invention has done following improvement with the order that conforms to a conventional pattern of kink:

The load signal of 13# milling train is directly introduced in the control interface circuit of 2# and 5# kink, the trailing edge signal that can send reflection rolled piece afterbody and do not have the steel signal with the 13# milling train controls 2# simultaneously and the 5# kink conforms to a conventional pattern.The load signal of 14# milling train is directly introduced in the control interface circuit of 6# kink, the trailing edge signal that can send reflection rolled piece afterbody and do not have the steel signal with the 14# milling train is controlled the 6# kink simultaneously and is conformed to a conventional pattern.The load signal of 14# milling train is directly introduced in the control interface circuit of 7# kink, the trailing edge signal that can send reflection rolled piece afterbody and do not have the steel signal with the 14# milling train is controlled the 7# kink simultaneously and is conformed to a conventional pattern.

Fig. 2 is that the kink scanner of this embodiment detects the rolled piece schematic diagram.Comprise the kink 25 that kink scanner 21, upright looper 22, rolled piece 23, kink scanner detecting light beam 24, rolled piece form among the figure.

Fig. 3 is the kink automatic control signal sequential chart of this embodiment.A is a 13# mill load signal among the figure, B is that the 3# kink plays the cover signal that conforms to a conventional pattern, and C is a 14# mill load signal, and D is that the 4# kink plays the cover signal that conforms to a conventional pattern, E is a 14# mill load signal, F is that the 5# kink plays the cover signal that conforms to a conventional pattern, and G is a 16# mill load signal, and H is that the 6# kink plays the cover signal that conforms to a conventional pattern, I is a 16# mill load signal, J is that the 7# kink plays the cover signal that conforms to a conventional pattern, and K is a 17# mill load signal, and L is a time-axis direction.

Fig. 4,5 is respectively that kink automatic control flow chart figure and the finishing mill milling train sky of this embodiment crossed and the automatic control logic switching flow of kink figure.Fig. 5 considers mm finishing mill unit because of the empty situation about crossing of certain two rolling mill that the variation of rolling kind exists, and has designed the not empty mistake of milling train and has crossed automatic selection control changeover program with sky, guarantees that under any kind, the kink of mm finishing mill unit can normally use.

Claims (1)

1. method that solves difficulty of looping tail at steel rolling production-line, it is characterized in that, the payload header of its employing milling train, tail signal are as the kink control signal, play the payload header signal of cover order from the downstream milling train, conform to a conventional pattern order from the load tail signal of upstream milling train, and carry out according to the following steps:

A. the load signal of first rolling mill is introduced directly in three kink device control interface circuit of first, second and third adjacent rolling mill of downstream as control signal;

B. successively the load signal of all the other upstream milling trains is introduced directly in the kink device control interface circuit between second and third adjacent rolling mill of downstream as control signal;

C. the reflection rolled piece afterbody that sends with the described upstream milling train trailing edge signal that do not have a steel signal is controlled the time of one～three rolling mill action that begins to conform to a conventional pattern in advance of downstream kink device simultaneously.

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