CN201143518Y

CN201143518Y - Loop control device for wire rod tandem rolling

Info

Publication number: CN201143518Y
Application number: CNU2007201853276U
Authority: CN
Inventors: 朱军; 荣胜波; 吴景辉; 史勃
Original assignee: Shenyang Institute of Automation of CAS
Current assignee: Shenyang Institute of Automation of CAS
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2008-11-05
Anticipated expiration: 2017-12-28

Abstract

The utility model relates to a wire continuous rolling technology, in particular to a movable sleeve control device which is used for wire continuous rolling and can effectively reduce the sleeve-starting over-adjusting quantity of the movable sleeve. The device comprises a first mill, a second mill and a movable sleeve scanner, an over-sleeve sensor, a sleeve-starting auxiliary cylinder and a guide wheel; wherein, the movable sleeve scanner is arranged between the first mill and the second mill and above the sleeve-starting highest point of the movable sleeve; the sleeve-starting sensor is arranged at the outlet end of the second mill; the sleeve-starting auxiliary cylinder is arranged at the outlet end of the first mill; the guide wheel is arranged at the position between the first mill and the second mil respectively close to the mill; an analog input module, an analog output module, a digit quantity input module and a digit quantity output module are inserted on a PLC; the movable sleeve scanner is connected with the analog input module by shielded twisted pair; the sleeve-starting sensor is a thermal metal detector and is connected with the digit quantity input module by cables; the sleeve-starting auxiliary cylinder is connected with the digit quantity output module by cables. The movable sleeve control device is characterized by simple structure and convenient usage, etc.

Description

A kind of kink control device that is used for wire tandem rolling

Technical field

The utility model relates to the wire tandem rolling technology, specifically a kind ofly can effectively reduce the kink control device of wire tandem rolling that kink plays the cover overshoot.

Background technology

The production process of continuous rolling production line is such: steel billet through heating furnace be heated to 1100 the degree after, successively by roughing, in roll, 10 above milling trains of finish rolling rolling after become the wire rod finished product.For fear of in the operation of rolling between adjacent two frames because of drawing steel to influence the quality of wire rod, between each frame of finish rolling, install looper additional usually.Big overshoot often appears in loop control method in the past in playing the cover process, normally sting steel thereby influenced, and whole steel material scrapped.

The utility model content

In order to overcome the weak point of the control of kink in the past, the utility model provides the new control device of a cover at kink, the overshoot when purpose is that can effectively reduce kink plays cover.

The purpose of this utility model is achieved through the following technical solutions:

The utility model comprises first and second milling train and kink scanner, super cover sensor, plays cover assistant cylinder and directive wheel, wherein: the kink scanner kink between first and second milling train rise cover peak position above, the kink scanner links to each other with Programmable Logic Controller by Shielded Twisted Pair; Play the port of export that the cover sensor is located at second milling train; Play the port of export that the cover assistant cylinder is positioned at first milling train; Position near milling train is provided with directive wheel respectively between first milling train and second milling train.

Wherein: be inserted with analog quantity input module, digital quantity input module, digital quantity output module and analog output module on the described Programmable Logic Controller, the kink scanner links to each other with the analog quantity input module by Shielded Twisted Pair; Playing the cover sensor is hot metal detector, links to each other with digital quantity input module by cable; Playing the cover assistant cylinder links to each other with the digital quantity output module by cable.

Advantage of the present utility model and good effect are:

The utility model is simple in structure, easy to use, can effectively improve the rolling quality of stinging steel success rate and wire rod in the operation of rolling.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an electrical schematic diagram of the present utility model;

Fig. 3 is of the present utility model cover milling train climb curve figure;

Fig. 4 is the program flow diagram of the utility model Programmable Logic Controller.

The specific embodiment

The loop control method that is used for wire tandem rolling: enter milling train with the directive wheel 6 guiding wire rods that are positioned between adjacent two rolling mills, the cover sensor 4 that rises that is located at second milling train, 2 exits detects wire rod head arriving signal and has sent the cover order, by playing 5 steady covers of cover assistant cylinder, adopt Programmable Logic Controller 8 also to control stretching out of assistant cylinder 5 of cover and carried out cover according to the speed of the milling train climb curve parameter adjusting milling train that calculates; After playing cover and finishing, the speed of regulating milling train by closed loop pid number control algolithm is controlled the height of kink again.Since during closed loop PID control, the looper height that the actual height of kink equals or approaches to set, and therefore, the overshoot of kink control is very little, thereby has effectively improved the success rate of stinging steel.

As shown in Figure 4, described programmable controller program flow process is:

Initiation parameter at first: distance L=2400 (mm) between two directive wheels, first milling train plays the speed V1=8.5 (m/s) before the cover, plays cover speed V2=8.65 (m/s), plays cover acceleration a=1.5 (m/s ²), rate conversion COEFFICIENT K, program scanning period T s=0.005 (s), climb curve time t=0; Set looper height H=400 (mm); Judged whether the cover sensor has signal, if the result then continues to carry out next step for being, otherwise termination routine; Calculate the arc radius R=(4*H that kink constitutes ²+ L ²)/(8*H)=3800 (mm); Calculate arc length m=2*R*arcsin (L/ (2*R))=2440.56 (mm) that kink constitutes; Calculate kink plussage S=m-L=40.56 (mm); Calculate the climb curve parameter: raising speed time T a=(V2-V1)/a=0.1 (s) keeps V2 speed time T b=S/ (V2-V1)-Ta=0.167 (s); Having controlled the cover assistant cylinder stretches out; Calculate climb curve time t=t+Ts; Calculate motor speed controlled quentity controlled variable u; When t＜Ta, u=K* (V1+a*t); When Ta＜=t＜(Ta+Tb), u=K*V2; When (Ta+Tb)＜=t＜(Ta+2*Tb), u=K* (V2-a*t); Output controlled quentity controlled variable u; Whether judge t greater than Ta+2*Tb,, otherwise continue to carry out next step if the result then turns back to and calculates climb curve time t=t+Ts for not; Read looper height value of feedback H _fCalculate looper height error e=H-H _fAccording to the digital PID algorithm, calculate controlled quentity controlled variable u and export controlled quentity controlled variable u; Judge whether rolling finishing of steel material, if the result then turns back to and reads looper height value of feedback H for not _f, otherwise continue to carry out next step.Controlled cover assistant cylinder retraction; EP (end of program).

The utility model equipment therefor, as shown in Figures 1 and 2, comprise first and

second milling train

1,2 and kink scanner 3, super cover sensor 4, play cover assistant cylinder 5 and directive wheel 6, wherein: kink scanner 3 is between first and

second milling train

1,2, and the alignment lens kink on it works the top of peak position when overlapping; Play the port of export that cover sensor 4 is located at second milling train 2; Play the port of export that cover assistant cylinder 5 is positioned at first milling train 1; Position near milling train is provided with directive wheel 6 respectively between first milling train 1 and second milling train 2, distance between two directive wheels 6 is L, the effect of directive wheel is to guarantee that wire rod can enter with the direction perpendicular to second milling train, 2 turning cylinders, has so just guaranteed that wire rod can enter second milling train 2 smoothly.Programmable Logic Controller 8 is inserted with analog quantity input module 9, digital quantity input module 10, digital quantity output module 11 and analog output module 12 on its base plate.Playing cover sensor 4 is hot metal detector, links to each other by the first passage of cable with digital quantity input module 10.Kink scanner 3 is a kind of sensors that can detect looper height, and measured value can be converted to standard 4～20mA signal, and its output links to each other by the first passage of Shielded Twisted Pair with analog quantity input module 9.Playing cover assistant cylinder 5 is the pneumatic element of solenoid control, and the magnetic valve on it links to each other by the first passage of cable with digital quantity output module 11.Servo-driver 7, the analog quantity input interface on it links to each other by the first passage of Shielded Twisted Pair with analog output module 12, and its output links to each other with the motor of first milling train 1.

See its control procedure by the utility model structure:

At first start first milling train 1 and second milling train 2, the analog output module 9 of Programmable Logic Controller 8 is V1 by the speed of servo-driver 7 controls first milling train 1, wire rod is heated to 1100 ℃ in heating furnace after, successively by breaking down, in roll, when having arrived cover sensor 4 when wire rod arrival finish rolling district and by first milling train 1 and second milling train 2, the state that plays cover sensor 4 becomes 1 by 0.After Programmable Logic Controller 8 has detected the state variation of cover sensor 4 by digital quantity input module 10, calculated cover motor speed curve according to the looper height H that sets, and, controlled cover assistant cylinder 5 by digital quantity output module 11 simultaneously and stretched out by the motor raising speed of calculating that motor speed curve negotiating analog output module 12 driving servo-drivers 7 are controlled first milling train 1 of overlapping.Because after the motor raising speed of first milling train 1, therefore the second flow amount of the wire rod by first milling train 1, between first milling train 1 and second milling train 2, the kink of a wire rod occurred greater than the second flow amount of the wire rod by second milling train 2.After according to a cover rate curve raising speed of calculating, the looper height that the height of kink equals or approaches to set, read the value of feedback of kink scanner 3 measured values (height of kink) this moment as looper height closed loop pid number control algolithm, the looper height of setting with Programmable Logic Controller 8 is as set-point, as error, calculate and control the speed of first milling train 1 by the difference of set-point and value of feedback through the digital PID control algolithm.So just finished by rising and be set to the smooth transition of steady cover, thereby avoided looper height control to go up the overshoot that occurs.

Claims

1. kink control device that is used for wire tandem rolling, it is characterized in that: comprise first and second milling train (1,2) and kink scanner (3), super cover sensor (4), play cover assistant cylinder (5) and directive wheel (6), wherein: kink scanner (3) is positioned at the top that kink between first and second milling train (1,2) plays cover peak position, and kink scanner (3) links to each other with Programmable Logic Controller (8) by Shielded Twisted Pair; Play the port of export that cover sensor (4) is located at second milling train (2); Play the port of export that cover assistant cylinder (5) is positioned at first milling train (1); Position near milling train is provided with directive wheel (6) respectively between first milling train (1) and second milling train (2).

2. by the described kink control device that is used for wire tandem rolling of claim 1, it is characterized in that: be inserted with analog quantity input module (9), digital quantity input module (10), digital quantity output module (11) and analog output module (12) on the described Programmable Logic Controller (8), kink scanner (3) links to each other with analog quantity input module (9) by Shielded Twisted Pair.

3. by the described kink control device that is used for wire tandem rolling of claim 2, it is characterized in that: described cover sensor (4) is hot metal detector, links to each other with digital quantity input module (10) by cable.

4. by the described kink control device that is used for wire tandem rolling of claim 2, it is characterized in that: described cover assistant cylinder (5) links to each other with digital quantity output module (11) by cable.