CN103990652B

CN103990652B - A kind of loop control method of pipe line steel

Info

Publication number: CN103990652B
Application number: CN201410217317.0A
Authority: CN
Inventors: 张世厚
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2014-05-19
Filing date: 2014-05-19
Publication date: 2016-06-22
Anticipated expiration: 2034-05-19
Also published as: CN103990652A

Abstract

The loop control method of a kind of pipe line steel, belongs to steel rolling field, and including (1) strip steel finish rolling outlet target temperature less than or equal to 810 DEG C, finished product thickness, be more than or equal to 8mm, determines the control parameter of kink between each frame by I and II computer according to formula；(2) according to process data and steel grade requirement, second computer sets up the Table Model of the kink steel grade coefficient of tension；When rolling, second computer obtain by tabling look-up different kink the steel grade coefficient of tension and under give。Present invention Hydraulic Looper of achieving between hot-rolling finishing mill frame when rolling pipe line steel automatically controls, and solves the problems such as Hydraulic Looper vibration between hot-rolling finishing mill frame when rolling pipe line steel, decreases the cancel closedown time。

Description

A kind of loop control method of pipe line steel

Technical field

The present invention relates to the autocontrol method of a kind of hot-continuous-rolling strip steel rolling line。

Background technology

Owing to continuous hot-rolling mill finishing stand is generally made up of 7 rolling mills, often between adjacent two rolling mills, there is a Hydraulic Looper。It is realized by I and II computer that finishing mill controls, it is all that second-level model server has been calculated according to technological requirement before strip steel enters milling train that each milling train steel grade coefficient of tension, kink set tension force etc., and the kink torque adjusting control etc. of each milling train is all completed by primary computer PLC。Exploitation along with special steel kind, when rolling think gauge pipe line steel, due to finishing stand speed very low (less than 2.5m/s) and when low speed segment response characteristic bad thus cause Hydraulic Looper regulate with rolling-mill housing speed adjustment do not mate, cause 0#-5# kink between finishing stand that oscillatory occurences occurs, direct steel scrap between frame can be caused time serious, have a strong impact on being normally carried out of rolling line production, bring very big economic loss to enterprise。

Summary of the invention

The present invention seeks to overcome the deficiency of above-mentioned prior art, it is provided that kink oscillatory occurences between finishing stand can be solved, ensure a kind of pipe line steel loop control method that hot rolling normally produces。

The technical scheme is that

(1) strip steel finish rolling outlet target temperature is less than or equal to 810 DEG C, and finished product thickness, be more than or equal to 8mm, determines the control parameter of kink between each frame by primary computer: Sn=Sn-1+K*Kp*{ (1+TA/TN) * △ Mn-△ Mn-1}

In formula, Sn is the given output (-1.0-1.0) of servo valve of the kink torque controller of sampling instant n；Sn-1 is the given output (-1.0-1.0) of servo valve of the kink torque controller of sampling instant n-1；TA is the program scanning time, is generally 2-10ms；TN is the time of integration, is generally 1000-4000ms；Kp is proportionality coefficient, is generally 10*10^-6-12*10^-6；K is the steel grade coefficient of tension sent under second-level model computer, for 0.1-1；△ M_nFor the kink torque difference (given moment-actual moment) of sampling instant n, Nm；△ Mn-1 is the kink torque difference (given moment-actual moment) of sampling instant n-1, Nm。

Primary computer selection marker completes the judgement of correspondence and processes, further according to the tracking signal completion logic chain function of strip steel, thus meeting automatic loop control requirement。

The automatic loop control program when rolling think gauge pipe line steel is realized by primary computer, solve the technical controlling problem of adjustment of loop, delay to regulate kink response speed by reducing proportionality coefficient the time of integration and coefficient of tension value strengthening machine frame loop torque adjusting, make the adjustment of actual tower-loop control coupling main frame speed, meet strip steel and control technological requirement。

(2) completed down to send the loop tension coefficient distinguishing steel grade by second computer, it is achieved kink Torque Control。That is according to process data and steel grade requirement, second computer by model of tabling look-up obtain different kink the coefficient of tension and under give。

Thickness be more than or equal to the coefficient of tension of each kink of 8mm pipe line steel is: the coefficient of tension of 0# kink is: 0.6；The coefficient of tension of 1# kink is: 0.6；The coefficient of tension of 2# kink is: 0.55；The coefficient of tension of 3# kink is: 0.45；The coefficient of tension of 4# kink is: 0.4；The coefficient of tension of 5# kink is: 0.3。

Primary computer determines whether rolling pipeline steel strip steel according to the concrete data of rolled band steel, if it is puts into this Control Technology of Dancer, until rolling；Otherwise use normal automatic loop control program。

The present invention is by developing low temperature think gauge pipe line steel Control Technology of Dancer, it is ensured that when rolling pipe line steel, Hydraulic Looper automatically controls。The Hydraulic Looper achieved between hot-rolling finishing mill frame when rolling pipe line steel automatically controls; the problems such as Hydraulic Looper vibration between hot-rolling finishing mill frame are solved when rolling pipe line steel; solve Hydraulic Looper stability between hot-rolling finishing mill frame when rolling pipe line steel, decrease the cancel closedown time。

Accompanying drawing explanation

Fig. 1 is the logical flow chart of the present invention。

Detailed description of the invention

The invention process process is entirely and is automatically obtained in computer program。Main process is: according to strip steel finish rolling outlet target temperature (less than or equal to 810 DEG C) and finished product thickness (be more than or equal to 8mm), the judgement completing correspondence as primary computer selection marker processes；Completed down by second computer to send the loop tension coefficient distinguishing steel grade, according to strip tracking signal and selected signal put into the time of integration strengthening machine frame loop torque adjusting and reduce the given algorithm program of proportionality coefficient by primary computer afterwards, under ensureing the premise of strip steel normal threading and rolling, put into pipe line steel automatic loop control program。

Embodiment:

When rolling steel grade and be L360, thickness being 8mm, second computer (HP server) checks in the coefficient of tension of all kinks by Table Model and enters at strip steel that finishing mill is front lower send primary computer (PLC)。Primary computer puts into the control of corresponding milling train kink according to this strip finishing temperature 810 DEG C and strip steel finished product thickness 8mm as the selection marker of this control technology simultaneously according to the follow load signal of each rolling mill。The sweep time of this program is 5ms, 0# kink: the time of integration 2500ms, the steel grade coefficient of tension 0.6；1# kink: the time of integration 2650ms, the steel grade coefficient of tension 0.6；2# kink: the time of integration 2800ms, the steel grade coefficient of tension 0.55；3# kink: the time of integration 3000ms, the steel grade coefficient of tension 0.45；4# kink: the time of integration 3200ms, the steel grade coefficient of tension 0.4；5# kink: the time of integration 3500ms, the steel grade coefficient of tension 0.3。If without selection marker, it is controlled according to normal Control Technology of Dancer。

The present invention it may be noted that: the parameter of different its tower-loop control of milling equipment also differs, it is necessary to carry out debugging determine according to scene is actual, such as the time of integration, tension force steel grade coefficient etc.。In a word, by after implementing this technology between milling train tower-loop control do not vibrate again, the production met under milling train low-speed situations is normally carried out, and effect is very good。

Claims

1. a loop control method for pipe line steel, is characterized in that:

(1) strip steel finish rolling outlet target temperature is less than or equal to 810 DEG C, and finished product thickness, be more than or equal to 8mm, determines the control parameter of kink between each frame according to the following formula by I and II computer:

One-level kink torque controller algorithm is as follows:

S_n=S_n-1+K*K_p*{〔1+T_A/T_N〕*△M_n-△M_n-1}

In formula, S_nServo valve for the kink torque controller of sampling instant n gives output, for-1.0-1.0；S_n-1Servo valve for the kink torque controller of sampling instant n-1 gives output, for-1.0-1.0；T_AFor the program scanning time, for 2-10ms；T_NFor the time of integration, for 1000-4000ms；K_pFor proportionality coefficient, for 10*10^-6-12*10^-6；K is the steel grade coefficient of tension sent under second computer, for 0.1-1；△ M_nKink torque difference Nm for sampling instant n；Kink torque difference Nm=gives moment-actual moment；△ M_n-1Kink torque difference Nm for sampling instant n-1；

(2) according to process data and steel grade requirement, second computer sets up the Table Model of the kink steel grade coefficient of tension；When rolling, second computer obtain by tabling look-up different kink the steel grade coefficient of tension and under give；Thickness be more than or equal to 8mm pipe line steel difference kink the steel grade coefficient of tension respectively: the coefficient of tension of 0# kink is: 0.6；The coefficient of tension of 1# kink is: 0.6；The coefficient of tension of 2# kink is: 0.55；The coefficient of tension of 3# kink is: 0.45；The coefficient of tension of 4# kink is: 0.4；The coefficient of tension of 5# kink is: 0.3。