SU1657561A1 - Automatic control system for paper web winding - Google Patents

Abstract

This invention relates to devices for controlling the winding of a paper web on paper processing equipment. The aim of the invention is to improve the accuracy of regulation of the tension of the paper web during acceleration and deceleration. The system includes a winding speed setpoint 1, a speed controller 2, a current controller 3 of a driving motor, a first power converter 4, a drive electric motor 5 of a nakata, a current sensor 6 of an electric motor, a speed sensor 7, a current setting 8 of a braking roll generator, a current regulator 9. brake generator, second power converter 10, brake generator 11 roll, current sensor 12 of brake generator, regulator EMF 13 of brake generator, third power converter 14, sensor EMF 15 of brake generator. The outputs of the setpoint 1 and the speed sensor 7 are connected to the inputs of the speed controller 2, the outputs of the speed controller 2 and the current sensor 6 are connected to the inputs of the current controller 3, the output of which is connected to the input of the first power converter 4 connected to the output of the electric motor 5. The outputs of the setpoint generator 8 and current sensor 12 are connected to inputs of current regulator 9, the output of which is connected via a second power converter 10 to the core circuit of generator 11. The outputs of sensor EMF 15 and speed sensor 7 are connected to inputs of regulator EMF 13, the output of which through the third power converter 14 is connected to the excitation winding of the generator 11. The system has a roll diameter 16 meter, a dynamic moment calculator, a storage unit 18, a summing amplifier 19, a switch 20. a control signal generating unit 21 and a differentiating amplifier 22. The output of the setting device 1 through the amplifier 22 and the outputs of the sensor 16 of the roll and the speed sensor 7 are connected to the inputs of the calculator 17, the output connected to the first input of the summing amplifier 19. The output of the current sensor 6 is connected to the second input of the amplifier 19 and black storage unit 18c its third output, and the output of amplifier 19 is connected through a switch 20 to brake the generator input current regulator 9 torus. The output of the setpoint speed 1 through the amplifier 22 is connected to the input of the control signal generating unit 21, and the output of the unit 21 is connected to the control inputs of the storage unit 18 and the switch 20. 3 sludge. with etoo ate vi ate (

Description

The invention relates to devices for controlling the winding of a paper web on paper processing equipment: slitting machine, rewinding machine, super calender, etc.

The purpose of the invention is to improve the accuracy of regulation of the tension of the paper web during acceleration and deceleration.

Figure 1 is a diagram of an automatic control system for winding a paper web; figure 2 - diagram of the calculator of the dynamic moment; FIG. 3 is a circuit diagram of a switching control unit.

The system (Fig. 1) contains a winding speed setting device 1, a speed regulator 2, a control drive motor current regulator 3, a first power converter 4, a drive electric motor 5, a control motor current sensor 6, a winding sensor 7, a current sensor 8 brake generator roll, brake current controller 9, second power converter 10, brake roll generator 11, brake generator current sensor 12, brake generator EMF regulator 13, third power converter 14, sensor 15 EMF then bremsstrahlung generator roll diameter sensor 16 at the reel, the calculator 17 nakate dynamic torque motor, a storage unit 18, a summing amplifier 19, the switch 20, the control unit 21 generating a control signal, and a differentiating amplifier 22.

The dynamic moment calculator 17 (Fig. 2) contains multiplication blocks 23-25 and a summing amplifier 26. Both inputs of block 23 through the second input of calculator 17 are connected to a diameter sensor 16. Both inputs of block 24 through the third input of calculator 17 are connected to speed sensor 7. The first input of block 25 and the third input of amplifier 26 through the first input of calculator 17 are connected to the input of differentiating amplifier 22. The second input of block 25 is connected to the output of block 23, the outputs of blocks 25 and 24 are connected respectively to the first and second inputs of summing amplifier 26, and the output of the last connected to the output of the calculator 17,

The algorithm of the dynamic moment calculator, which relates the output signal of the dynamic moment calculator 17 to the input signals of the calculator, i.e. with the output signals of the coil-on-roll diameter sensor 16, the speed sensor 7 and the differentiating amplifier 22, is determined by the expression

Mdin - -tg (J (nak) -

 ,, dV, ,, „2 dV., 2 -Co- + CiD d + C2V

This expression is obtained as a result of transformations of the system of equations:

J SKDV.nak (Jnex.HaK + Jpyn) X Mmv.mzk i

D) P

. P2 P p. - shaft

U P tf

- To D2;

1.5

V h dt;

0

V

0

five

0

five

WAB.HSK - -f

where J is the total moment of inertia of the run-up, reduced to the shaft of the run-up electric motor, kgm;

Jwex.HaK - the moment of inertia of the overrun mechanism, reduced to the overcurrent motor shaft, kgm;

Jpyn - the moment of inertia of the roll, reduced to the roll-up motor shaft, kgm2;

D.B is the diameter and width of the roll of paper on the coil, m;

h, p - respectively, the thickness and specific density of the paper, m, kg / m3:

V is the winding speed of the web, m / s;

and - angular speed of the electric motor roll,

K, Co.Ci.Ca design parameters;

Oval - diameter of the carrier rolls roll, m;

i - gear ratio.

Switching control unit 21 (FIG. 3) is an analog comparator with two inputs, which is connected via an rectifier diode bridge to the output of a differentiating amplifier. If the comparator, then its output is -Upitani, if DBX 0, then its output is 0.

The control system for winding the paper Q web operates as follows.

At the beginning of the winding cycle, the machine operates at an auxiliary speed and the web is charged from roll to roll. Then, the setpoint of the current 8 of the brake generator of the roll of the roll establishes the required tension of the web before the roll. In this case, the output voltage of the control signal generating unit 21 is zero. Switch 20 disconnects the output of the summing amplifier 19 from the input of the regulator 9

current brake generator, and the storage unit 18 operates in the mode of sampling the signal. The output signal of the calculator 17 of the dynamic moment is close to zero in accordance with its input signals and the algorithm of their processing. The output signal of the summing amplifier 19 is equal to zero, since the signals at the second and third inputs are equal and cancel each other.

The second step is to accelerate the machine to operating speed. At this stage, equal to VCKOpeHHo, the output voltage of the speed setpoint 1 increases. A signal appears at the output of differentiating amplifier 22.

DV,

- r - more than zero.

The control signal generation unit 21 closes the switch 20 and switches the memory 19 to the memory of the output signal of the overcurrent motor 6,

In this case, during the acceleration of the machine, a closed loop is created to control the tension of the web before rolling. In it, the master signal is the sum of the signal from the storage device 19, which represents the static load of the roll forward drive, and the signal or calculator 17 of the dynamic moment needed to accelerate the roll with a given acceleration. Static load on the drive of the overrun is determined by the web tension and rolling friction resistance.

During machine acceleration, a significant variable factor affecting the load of the drive electromotor is the tension of the web. Therefore, the tension fluctuations are reflected in the oscillations of the current of the axle drive motor.

The meter for the circuit in question is the overrun drive motor 6 sensor. The amplified difference of the signals arriving at the inputs of summing amplifier 19 is applied to the input of current regulator 9 of the brake generator. The output signal of the regulator 9 acts on the braking moment of the generator 11 so that the web tension tends to a given value, and the algebraic sum of the signals at the input of the amplifier 19 tends to zero.

At the third stage of the machine operation at a constant winding speed, the output signal - g differentiating amplifier 22

equal to zero, the control signal generating unit 21 using the switch 20 turns off the signal supply circuit from the summing amplifier 19 to the brake generator current regulator 9 and switches the storage unit 18 to the run-up drive current sensor 6 signal sampling mode. The brake generator alternating current control loop and the brake alternator EMF control loop at the winding stage with a constant speed provide the torque value of the brake ienerator 11, which is proportional to the radius of the roll on the roll, and thus ensures a stable and equal to a given web tension.

The fourth stage is the stage of braking DV

neither when

dt

becomes less than zero,

the correction signal supply circuit is switched on again, taking into account the dynamic braking torque

The difference in the operation of the system at the stage of braking from the work at the stage of acceleration is only that at the end of the winding due to the increased weight of the roll on the coil and due to the change in the area of the coil contact with the roll bearing rolls, the static load and, accordingly, the current of the run-up motor significantly increase compared to their value at the start of winding. Therefore, the part of the master signal at the input of summing amplifier 19 removed from the output of the storage unit 18. increases

The varying amount of static load of an overrun with an equal tension of the web causes the use of a storage device as a master in the tension control loop created during the acceleration and deceleration of the machine

Speed controller 1, speed controller 2, speed control current regulator 3, overrun motor, first power converter 4, overrun drive motor 5, overrun motor current sensor 6, speed overload sensor 7, brake current setpoint 8 (generator, second power converter 10, brake generator 11, brake generator current sensor 12, brake generator regulator 13, third power converter 14, brake generator EMF sensor 15 are similar in their schemes to the corresponding known elements of the control system or electric machine.

The summing amplifier 26 is designed in such a way that all signals supplied to its inputs have a positive polarity. The sensor 16 for the diameter of the coil wound on the reel is designed as a potentiometer connected to a constant voltage source. Slider with sliding contact of the potentiometer is kinematically connected with the clamping shaft and included in the machine design. This shaft presses the winding roll onto the roll-up support shafts ensuring rotation of the winding roll 5

The use of the system ensures precise control of the web tension during its winding and an improvement in the quality of the winding of the rolls. In addition to this, the system provides an increase in the productivity of the equipment due to a decrease in the breakage of the paper roll.

Claims (1)

Invention Formula Artoiati and G 1 of the winding systems “, oi 6 / Mri-toiu is watered by the skidder and winding adjuster, speed controller, the current regulator of the charging forward electric motor, the first power match power amp; started dcchic talk-gt drive elekfods and overrun headers / atchik winding speed; brake generator generator current opener; brake generator current controller; second power conversion; brake generator; tcht current brake generator, regulator EMF of the brake generator, third pgeobra powerful sensor EMF of a hot generator, sensor diameter of the bullet on the coil with the output setpoint1 speed winding sigoogin -hg by the first input of the transducer U l - torus of speed connected with a hot input to the output of the sensor HJM speeds. (and the output to the p input to the terminal of the drive of the overhanging electric motor of the glove with, one of which is connected to the outputs of the current sensor of the overhanging driving motor, and the output through the first power converter with the uphill of the overhanging electric motor - five ten 15 20 25 thirty 35 40 the brake generator of the roll is connected to the first input of the current generator of the brake generator, the second input of which is connected to the output of the brake generator generator current sensor and the output through the second power converter to the input of the root circuit of the brake generator of the roll output whose input is connected to the output of the third power converter connected the input with the output of the EMF regulator of the brake generator connected by the first input to the output of the EMF sensor of the brake generator is different in order to improve the accuracy By adjusting the tension of the paper strip during acceleration and deceleration, it will aggravate the dynamic overrun electric motor; remember it; 1 block summing amplifier switch блок signal shaping unit / right% - and differentiating amplifier with coil speed setting output h ° - the differentiating amplifier is additionally connected to the input of the control signal generating unit and the second input of the dynamic time calculator is connected to the output - the house of the roll diameter sensor on the roll forward is the third input to the sensor output of the windings and winding and the input of the EMF regulator brake t th generator, and the output to the first in the summing amplifier connected to the second input to the output the current sensor in the overhanging electric motor and the information output of the storage unit with the third output are connected to the output of the storage unit and the output to the information input of the switch is connected to the third input of the current regulator of the brake generator and the control input with the control input of the storage unit and the output of the signal formation unit HdPri control 1 1657561 Output (tSi / UL / CJ L // 77ejjr Input from dif.usilitel WITH" Input 3 from the speed sensor -.at Input 2 From dia / ra sensor .g 1657561 Fig.Z