CN101780897A - Strip material uncoiling tension control system - Google Patents

Abstract

The invention discloses a strip material uncoiling tension control system, used for controlling tension of strip material in uncoiling process. The system comprises a position detector, a corrector, a frequency converter, a driver and a feedback unit; wherein position detector is used for receiving a given quantity and the output quantity of the tension control system and comparing the two quantities to obtain a position deviation, the corrector is used for adjusting the position deviation to obtain a control input quantity, the frequency converter is used for carrying out frequency conversion on the control input quantity and outputting a driving signal, the driver is used for obtaining an uncoiling output quantity for driving the strip material according to the driving signal, and the feedback unit is used for collecting the output quantity and feeding back the output quantity to the position detector. By adopting the system of the invention, the tension control of strip material in uncoiling process can be rapidly and stably adjusted, so that the strip material can maintain constant tension in uncoiling process.

Description

A kind of tension control system of strip material uncoiling

Technical field

The present invention relates to a kind of tension control system, relate in particular to a kind of tension control system of strip material uncoiling.

Background technology

In the production process of plasterboard, the quality of plasterboard finished product outward appearance is decided by the pressing section of plasterboard.The tension force that protecting paper of gypsum board is drawn is a key factor that influences the plasterboard moulding.This paper Force control system is actually the Stellungsservosteuerung of letterweight roller.Stellungsservosteuerung is the track channel of output for given input, and it is a feedback control system, and what it was realized is the accurate tracking of actuating unit for position command.Position command in the Stellungsservosteuerung (specified rate) is the same with controlled variable (output), all is the space displacement electric weight of displacement (or represent) of load, can be angular transposition, also can be straight-line displacement.When the specified rate random variation, system can make controlled variable follow like clockwork and reappear specified rate.

Stellungsservosteuerung requires different with the performance figure of drive control system.For drive control system, specified rate is constant normally, requires the constant of system held output, so the disturbance rejection performance figure are the key technical indexes; For Stellungsservosteuerung, specified rate is that the position instruction normally changes, it is a change variable, requiring output is the variation that controlled variable is followed specified rate exactly, so be similar to the follow-up system of this class of protecting paper of gypsum board tension control system, its main performance index is rapidity, sensitieness and accuracy of system outlet response or the like.

Existing Tension Control generally adjusts the chart speed degree and the load transfer device speed synchronization realizes.But during speed synchronization, the tension force of paper may change, thereby causes that paper is because of the unbalance stress appearance damage or pull apart.

In the uncoiling process of strip material such as steel band, run into similar problem equally.Therefore be necessary to provide a kind of actv. control system, control the tension force of strip material in uncoiling process preferably.

Summary of the invention

Technical matters to be solved by this invention is the tension control system that is to provide a kind of strip material uncoiling, is used to control the tension force of strip material in uncoiling process.

In order to solve the problems of the technologies described above, the invention provides a kind of tension control system of strip material uncoiling, comprising:

Position detector is used to receive the output of a specified rate and described tension control system, and described specified rate and output are compared, and obtains a position deviation;

Connecting rod straightener links to each other with described position detector, is used for described position deviation is regulated, and obtains a control input;

Frequency converter links to each other with described connecting rod straightener, is used for described control input is carried out frequency-conversion processing, exports a drive signal;

Actuator links to each other with described frequency converter, is used for obtaining an output according to described drive signal, and this output is used to drive the uncoiling of described strip material; And

Feedback unit links to each other with described position detector and actuator, is used to gather described output, and feeds back to described position detector.

In the aforesaid system, described position detector can comprise potential device.

In the aforesaid system, described connecting rod straightener can comprise the proportion integration differentiation connecting rod straightener.

In the aforesaid system, described actuator can comprise:

Actuating motor links to each other with described frequency converter, is used for carrying out speed governing according to described drive signal, exports a speed-regulating signal;

Reductor links to each other with described actuating motor, is used for carrying out deceleration-operation according to described speed-regulating signal, obtains described output.

Compared with prior art, the various embodiments of system of the present invention can fast, stably be adjusted the Tension Control of strip material in uncoiling process, keep constant tension when making strip material uncoiling.

Description of drawings

Fig. 1 is a tension control system embodiment composition frame chart of the present invention.

The schematic flow sheet of Fig. 2 one method embodiment during for system applies of the present invention.

Fig. 3 is a SIMULINK constructional drawing embodiment illustrated in fig. 1.

Fig. 4 is system shown in Figure 1 embodiment simulation result Bode Diagram figure.

Fig. 5 is system shown in Figure 1 embodiment simulation result unit-step response figure.

The specific embodiment

Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application engineering means solve technical matters to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.

Fig. 1 is an embodiment of system of the present invention.As shown in Figure 1, this system embodiment mainly comprises position detector 110, connecting rod straightener 120, frequency converter 130 and actuator 140, wherein:

Position detector 110 is used to receive the output and the controlled variable U of a position given V and system, and this specified rate V and output U are compared, and obtains a position deviation;

Connecting rod straightener 120 links to each other with position detector 110, is used for the position deviation that position detector 110 is obtained is regulated, the control input after acquisition one is regulated; This connecting rod straightener is a proportion integration differentiation (PID) connecting rod straightener in the present embodiment, this output controlling quantity is the normalized current signal of the 4-20 milliampere after handling as required in the present embodiment, certainly, other quantity electric signal of measuring of an other unit also are fine;

Frequency converter 130 links to each other with connecting rod straightener 120, is used for the control input that connecting rod straightener 120 is obtained is carried out frequency-conversion processing, exports a drive signal, and this drive signal is the power supply signal of the control motor of a frequency change in the present embodiment;

Actuator 140 links to each other with frequency converter 130, is used for obtaining an output U according to drive signal, and this output U is used to drive the uncoiling work that unwinding device carries out strip material;

Feedback unit 150 links to each other with position detector 110, is used to gather the output U that is obtained of actuator 140, and feeds back to position detector 110.

As shown in Figure 1, above-mentioned actuator 140 can comprise an actuating motor 142 and a reductor 144, wherein:

This actuating motor 142 links to each other with frequency converter 130, is used for carrying out speed governing according to the drive signal that frequency converter 130 is exported, and exports a speed-regulating signal;

This reductor 144 links to each other with this actuating motor 142, is used for obtaining this output U according to the speed-regulating signal that actuating motor 142 the is exported processing of slowing down.

Fig. 2 is the steps flow chart scheme drawing of the described system embodiment of Fig. 1 method embodiment when using.Please refer to Fig. 1, as shown in Figure 2, this method embodiment mainly comprises the steps:

Step S210 receives a position given V;

Step S220 by feedback, gathers the output and the controlled variable U of acquisition system;

Step S230 compares this specified rate V and output U, obtains a position deviation;

Step S240 regulates this position deviation, obtains a control input; This control input can be treated to the normalized current signal of a 4-20 milliampere according to concrete needs, and certainly, other quantity electric signal that an other unit is measured also are fine;

Step S250 carries out frequency-conversion processing to this control input, obtains a drive signal then; This drive signal can be the power supply signal of the control motor of a frequency change;

Step S260 obtains an output U according to this drive signal, and this output U is used to drive unwinding device such as paper unwinding device or steel plate unwinding device and carries out uncoiling work; Simultaneously, this output U is fed back.

System embodiment shown in Figure 1 is the Stellungsservosteuerung of a band position feedback ring.In the protecting paper of gypsum board unwinding device, the controlled variable of this Stellungsservosteuerung is that output U is the angular transposition of letterweight roller, i.e. the mechanical corner of letterweight roller.On a protecting paper of gypsum board uncoiling manufacturing line, above-mentioned position detector 110 is a potential device, and connecting rod straightener 120 is the integrated control module in the forming station AB PLC5 of plasterboard factory, and frequency converter 130 is an AB frequency converter 1336plus.

In the embodiment shown in fig. 1, a kind of configuration mode of each component part transfer function is:

The transfer function of pid correction device is:

$G_{\mathrm{PID}}=\frac{0.2s+1}{2s+1}\·\frac{0.8545s+1}{0.0004681s+1}$

The transfer function of frequency converter 130:

$G_{\mathrm{INVERTER}}=\frac{6.25}{0.007s+1}\·\frac{40}{0.00167s+1}$

The transfer function of actuating motor 142:

$G_{\mathrm{MOTOR}}=\frac{24}{0.0063S^2+0.9S+1}$

The transfer function of reductor 144:

$G_{\mathrm{GEAR}}=\frac{0.1}{S}$

According to above-mentioned transfer function, can construct SIMULINK constructional drawing as shown in Figure 3.In conjunction with SIMULINK constructional drawing shown in Figure 3, can come the frequency domain performance and the time domain index of diplomatic copy invention system embodiment with following MATLAB program:

％MATLAB?PROGRAM?PAPER.M

％

G1＝tf([0.2?1]，[2，1])；

G2＝tf([0.8545?1]，[0.0004681?1])；

G3＝tf(6.25，[0.007?1])；

G4＝tf(40，[0.00167?1])；

G5＝tf(24，[0.00630.9?1])；

G6＝tf(0.1，[10])；

G＝G1*G2*G3*G4*G5*G6；

margin(G)；

figure(1)；

[mag，phase，w]＝bode(G)；margin(mag，phase，w)；hold?on

[GM，Pm，Wcg，Wcp]＝margin(mag，phase，w)

sys＝feedback(G，1)；figure(2)；step(sys)

[y，t]＝step(sys)；perf(1，y，t)；t＝[0:0.01:30]′；

[ess1]＝ster(0，sys，t)；[ess2]＝ster(1，sys，t)；

By above-mentioned emulation program, can obtain as the Bode Diagram figure of Fig. 4 and unit-step response (Step Response) figure shown in Figure 5.The abscissa of Fig. 4 is frequency (frequency), and its unit is radian per second (rad/sec); Ordinate is respectively phase place (Phase), and its unit is degree (deg) and amplitude Magnitude, and its unit is (dB).The abscissa of Fig. 5 is time (Time), and its unit is (sec); Ordinate is amplitude (Amplitude).

As can be seen from Figure 5, static index and the dynamic indicator of said system embodiment are all relatively good, and the rapidity of system, sensitieness and accuracy are all better.In actual applications, the various embodiments of system of the present invention, can keep strip material is to keep constant tension in uncoiling.

Though the disclosed embodiment of the present invention as above, the embodiment that described content just adopts for the ease of understanding the present invention is not in order to limit the present invention.Technical personnel in any the technical field of the invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can do any modification and variation what implement in form and on the details; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.

Claims (4)

1. the tension control system of a strip material uncoiling is characterized in that, comprising:

Position detector is used to receive the output of a specified rate and described tension control system, and described specified rate and output are compared, and obtains a position deviation;

Connecting rod straightener links to each other with described position detector, is used for described position deviation is regulated, and obtains a control input;

Frequency converter links to each other with described connecting rod straightener, is used for described control input is carried out frequency-conversion processing, exports a drive signal;

Actuator links to each other with described frequency converter, is used for obtaining an output according to described drive signal, and this output is used to drive the uncoiling of described strip material; And

Feedback unit links to each other with described position detector and actuator, is used to gather described output, and feeds back to described position detector.

2. the system as claimed in claim 1 is characterized in that:

Described position detector comprises potential device.

3. the system as claimed in claim 1 is characterized in that:

Described connecting rod straightener comprises the proportion integration differentiation connecting rod straightener.

4. the system as claimed in claim 1 is characterized in that, described actuator comprises:

Actuating motor links to each other with described frequency converter, is used for carrying out speed governing according to described drive signal, exports a speed-regulating signal;

Reductor links to each other with described actuating motor, is used for carrying out deceleration-operation according to described speed-regulating signal, obtains described output.

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