Scholarly article on topic 'Tension Control and Loaded-balanced Control Of the Plate Production Line'

Tension Control and Loaded-balanced Control Of the Plate Production Line Academic research paper on "Mechanical engineering"

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Procedia Engineering
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Keywords
{"Tension roller" / T400 / "Tension control" / "Load-balanced control" / "Droop control"}

Abstract of research paper on Mechanical engineering, author of scientific article — Wang Cuiping

Abstract Tension control is a crucial measure to ensure stable and reliable operation of the plate production line. The paper begins with the example of the tension control of the Electrolytic Tinning Line(ETL), and introduces the method of tension control that realized by the Siemens T400 technology board and discusses the strategy of 1# tension roller load-balanced control that carried out by Siemens 6SE70 Simovert Masterdrives. The practice shows that these methods have a simple and reliable programming, make debugging convenience, achieve satisfactory control effect and significantly improve product quality.

Academic research paper on topic "Tension Control and Loaded-balanced Control Of the Plate Production Line"

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SciVerse ScienceDirect

Procedía Eng ine ering 15 (2011) 18 - 22

Procedía Engineering

www.elsevier.com/Iocate/procedia

Advanced in Control Engineeringand Information Science

Tension Control and Loaded-balanced Control Of the plate

production line

Wang Cuiping

The College of Computer and Electronic Information Engineering, Shangdong Yingcai University, Shandong Jinan, 250104

Abstract

Tension control is a crucial measure to ensure stable and reliable operation of the plate production line. The paper begins with the example of the tension control of the Electrolytic Tinning Line (ETL) ,and introduces the method of tension control that realized by the Siemens T400 technology board and discusses the strategy of 1# tension roller load-balanced control that carried out by Siemens 6SE70 Simovert Masterdrives. The practice shows that these methods have a simple and reliable programming, make debugging convenience, achieve satisfactory control effect and significantly improve product quality.

© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]

Key words: Tension roller; T400; Tension control; Load-balanced control; Droop control

1.1. Preface

Requirements of the production process sheet production line of tension control, tension control a direct impact on the stability of the whole system. Therefore tension control in the entire production line is a key issue. Tension control plate will not tend to fold or crease, rub the edge of cover strip, plate and other issues can not be high-speed production. In addition to multi-motor drive system, only the speed of synchronous motor and the actual system can not meet the work requirements, but also the electrical load of the transmission rate of the same point, otherwise there will be a large motor load distribution, load distribution of a small motor situation. So this paper production line of tin as an example, the tension control on the load distribution control and the rational use of transmission system.

Corresponding author. Tel.: 15069084263; fax: 0531-88253047.

1877-7058 © 2011 Published by Elsevier Ltd. doi:10.1016/j.proeng.2011.08.005

E-mail address: tendergirl1208@163.com.

2. 2. The Question of the tension control

2.1. Principles of Tension Control

The design uses Siemens SIMOVERT MASTERDRIVE vector control AC Drive. The use of static to the rotating coordinate system transformation between the coordinate system can be stator current component of exciting current and torque current Isd into a scalar quantity independent Isq off to carry out the respective control. Tension T and the relationship between motor torque for

M = TD (1)

Where, M for the motor torque, T for uncoiler tension, D is the diameter of steel, i for the book to the reel motor of the reduction ratio for the transmission efficiency.

Motor torque M and the magnetic flux and torque current components have Isq relations

M = KJMq (2)

Where, M is the torque motor, Km constant for the motor for the magnetic flux. By the formula (1) and (2) can be drawn the relationship of the tension T and 0, D and Isq

M = K—Iq (3)

There into M = 2Kmi (4)

2.2 Uncoiler tension control to achieve

Tin production line speed above the entrance to the new 1 # S-type tension roller mainly control the speed of Indirect tension control board through the completion of T400 technology, shorter development cycles in the circumstances, can significantly reduce the amount of PLC programming and control of simple and practical. T400 technology board calculated Volume trail, so need to test line speed, and the need to open a book on the establishment of the spindle motor encoder pulse to detect angular velocity. Drive D is the calculation of volume as follows:

D —60V/nn (5)

Of which: V is linear velocity, n the angular velocity for the open-book machine. Uncoiler speed value given by the steering roller to be the actual speed can be calculated as

nset = ni # Zhang XDl # Zhang /D. (6)

The actual speed of motor : nact = (U-IR) / (KeO) (7)

The difference An = nset-nact. (8)

Specific implementation, the actual speed of electric motors nact brought by the encoder to detect CUVC board, CUVC board by board to T400; Vact speed gun by the roller-oriented code directly to disk to detect T400 plate; tension Zset a given set by the touch-screen console to S7-300, S7-300 through the Profibus-DP network to the T400 board. T400 plate after receiving the data, first of all by the T400 plate

calculation module to calculate the diameter of the actual coil diameter D, and then calculated according to the diameter of Uncoiler torque M, as open-book machine to the torque limiter CUVC board, thus ensuring a constant tension. Schematic diagram of its control as shown in Fig 1:

Given -4— tension

encoder

Uncoiler motor

encoder

compensation

bias —D

D=Vact^n

Nset=Vset^D -KX-

Speed controller Current regulator

Figl T400 technology board control schematic

3. The load distribution

3.1 the realization of load distribution

Load balancing is the basic principle of control from the pro-rata allocation of the total roll torque, where through the torque limiter to control the torque from the current roll. Specific algorithm is: first calculating the ratio of the balance from the roller K, set the torque from the roll for the 100% limit, and then entered the roll and read the actual torque from the current roll, the total sum of the torque current, and then use K multiplied by the total current obtained from the torque required to roll torque current, and finally calculate the torque from the roller from the roller to limit the amplitude of the inverter control to achieve load balancing. M2 tension rollers roll the need for load distribution control, the distribution of algorithm implementation by the PLC. Load distribution in accordance with the following formula:

MM2= (MMl+MM2)*—^- (9)

That is, MM2 = 0.577*(MM , + MM 2) Type in: MM j - Tension Roller roller torque M1; MM 2 - Tension Roller roller torque M2;

P1 - Tension Roller Roller Ml rated power, 11KW; P2 - Tension Roller roller M2 rated power,

3.2 sag control

Control of the so-called sag (Droop Control) aimed at multi-inverter / motor drive mechanical coupling to improve load distribution. For its control: the inverter by detecting variables such as torque, speed to adjust the value of a given. For example, the choice of softening sag control characteristics of the source for the torque, when the torque increases, the inverter output frequency will be reduced, so is likely to reduce the transmission load. Other transmission system will be part of sharing the load, and ultimately the entire system to achieve stable and evenly distributed load. Fig 2 for 1 # tension control roller sag chart:

(1)P245=K0155(Calculation of the source selected sag, Integral component)

(2)P246 (Selected nominal coefficient)

Fig 2 1 # tension control roller sag chart

4. Tension Control Modeling and Simulation

MATLAB language SIMULINK simulation tool can be used for take-up tension control computer simulation, here is focused on the tension-strip model.Used to drive the motor Uncoiler main technical data are as follows:

Motor power P = 30KW, rated torque M = 381Nm, speed rated nr = 730r/min, the maximum speed nmax = 1460r/min, the rated armature current Ia = 66A, gear transmission ratio i = 14.537, the total efficiency n = 0.9. Other data are as follows:

Strip thickness G = 0.15 ~ 0.50mm; strip width W = 700 ~ 1,000 mm; volume diameter D0 = 508mm; coil diameter Dmax = 1,800 mm. Tension of the scope of Uncoiler :0.75-1 .2kg/mm2

Figure 3 is the vector control speed control system simulation results, it is assumed that a given speed of 93, we can see the system can quickly reach a given value of the indicators and better.

200 150 100 50 0 -50 100 150 200

Fig3 Tension fluctuations in open-book emulation

Tension Control System of the simulation, from Figure 3 Simulation of the actual situation of tension can be seen that open-book machine to a good tension control. Tension oscillation time less than ls stable control, consistent with the tin-plating production lines of the principles of design, as well as this article confirms the accuracy of the ideological tension control.

5. Conclusions

Designed to be the tin production line, to control the tension control system and load balance control, after the actual operation of the scene showed that the tension of stability, the accuracy of the basic control within ± 2%, smooth and reliable operation; and on the current control system is similar The system has a strong anti-interference ability, stable speed and high precision, tension control, and low failure rate, parameter adjustment and convenient maintenance by users. This principle applies equally to control of galvanized wire, chrome line, color coating lines, pickling lines, such as lines and skim plate production line.

References

[1] Meina Ma. Simovert coiler tension control system [J]. Control Engineering, 2005,12 (2): 125 ~ 127,131.

[2] Zeng Guang, Chen Xiaofeng. Continuous hot-dip galvanizing line of tension control. Anshan Iron and Steel Technology, 2005 4 No. 334 overall.

[3] Tetsuzo Sakamoto, Yoshikazu Fujino. MODELING AND ANALYS OF A WEB TENSION CONTROL SYSTEM.IEEE Catalog Number.95TM8081.

[4] Chen Yi, Yang sources, Hongsun Shen . Tension Control System [M]. Beijing: Textile Industry Press, 1988.