JPH06135610A - Tensile force controller of paper machine - Google Patents

Abstract

PURPOSE:To enable tensile force feedback control to be carried out without using any tensile force detecting device by calculating tensile force generated by a reel drum from a torque out of electric current structure obtained by disassembling the electric current value of a reel section and a reel drum diameter. CONSTITUTION:A paper machine controller is provided with a roll controller 7 for controlling the rotational speed of an electric motor 5 for rotating and driving a calender roll 2 for polishing and calendering the surface of a paper 1 and a drum controller 8 for controlling the rotational speed of an electric motor 6 for rotating and driving a reel drum 3 around which the calendered paper 1 is wound. In this case, the tensile force control signal to be generated from a tensile force control circuit 18 and a draw set value on the basis of a tensile force set value by a tensile force setting unit K are added (21). And a tensile force function value is found by multiplying the electric current value in correspondence accelerating/decelerating torque obtained by processing the added signal value by means of current function disassembling circuit 20 by the fixed funtion in a function generator 19, moreover the rotational speed of the drum 3 is controlled on the basis of the difference of the tensile force value obtained by subtracting (22) the tensile force function value and the tensile force set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension control device for a paper machine.

[0002]

2. Description of the Related Art A conventional paper machine controller is composed of two sections, a calendar section and a reel section. The calendar section is a section for performing a treatment for polishing the surface of a finished paper to give a glossy surface, and a speed setter. The control device includes a control device that controls the speed at a speed set by the speed setting device, an electric motor, and a calendar roll that is driven by the electric motor. or,
The reel part is the part that winds the paper of the calendered product and is the final stage of the paper machine line. The reel is composed of a reel drum driven by an electric motor whose speed is controlled by a control device based on a speed reference having a speed ratio set by the draw setting device with respect to the speed set by the speed setting device. There is.

Further, a torque feedback value given by a differentiator and a function generator from a speed reference given to a reel section to a reel side control device and a torque reference returned from the control device is used as an acceleration / deceleration torque component, a mechanical loss component and a tension component. A current display device that disassembles and displays is attached,
The load status of the electric motor in the current operation is displayed.

In an actual operating state, the tension of the finished paper is adjusted by finely adjusting the draw setting device by the operator's hand according to the feeding state of the paper so that the rolled product will not be wrinkled. ing.

[0005]

In this case, the index of the adjustment is usually determined by the operator from the tension value by the tension detector mounted between the calendar section and the reel section and the paper feeding state. Judgment is made, but in a system without a tensiometer, the operator makes a judgment from the currents calculated and calculated by the current decomposition device and the paper feed state,
It was necessary to make adjustments based on intuition and experience. Therefore, the objective judgment criteria are poor, the operator is required to have a certain level of skill, and it is difficult to make accurate fine adjustments. Also, because of open-loop control, the operator constantly draws while watching the paper winding state. It was necessary to make fine adjustments to the setting device.

[0006]

The present invention is directed to a calendar roll for polishing and polishing the surface of paper, a roll drive motor for driving the calendar roll, and a roll control device for controlling the rotation speed of the roll drive motor. And a reel drum installed in the subsequent stage of the calendar roll for winding the calendered paper, a drum drive motor for driving the reel drum, a drum control device for controlling the rotation speed of the drum drive motor, and a roll drive. A speed setting device that gives a predetermined rotation speed to the electric motor, a draw setting device that determines a draw setting value by multiplying a speed reference value set by the speed setting device with a predetermined speed ratio, a calendar roll and a reel drum. Tension control based on the tension setter that presets the tension of the paper generated between the paper and the tension set value output from this tension setter Control circuit that outputs a signal, an adder that adds a tension control signal and a draw set value, and the addition signal value output from this adder is differentiated or corrected by a function generator, or a drum control device The current-based decomposition circuit that outputs the acceleration / deceleration torque component current value, mechanical loss component current value, and tension component current value after subtraction with the torque feedback value obtained from A deceleration torque component current value, a mechanical loss component current value, and a tension component current value are displayed on the current indicator, and a function generator that multiplies the acceleration / deceleration torque component current value by a predetermined function to output a tension function value. A tension control device for a paper machine, comprising: a subtracter that outputs a differential tension value obtained by subtracting a tension function value from a tension set value to a tension control circuit.

[0007]

In the tension control device for a paper machine according to the present invention, a calendar roll that polishes and polishes the surface of the paper is driven, the rotation speed of the roll drive motor is controlled, and a reel drum is installed in the subsequent stage of the calendar roll. Rolls the calendered paper, controls the rotation speed of the drum drive motor that drives the reel drum, and presets it to the speed reference value set by the speed setter that gives the roll drive motor a predetermined rotation speed. The tension of the paper that occurs between the calendar roll and the reel drum that determines the draw setting value by multiplying the speed ratio is preset, and the tension control signal is output based on the tension setting value output from the tension setting device, The tension control signal and the draw set value are added, the added signal value output from the adder is differentiated, or corrected by the function generator, or obtained from the drum controller. The torque feedback value is subtracted to output the acceleration / deceleration torque component current value, mechanical loss component current value, and tension component current value, and the acceleration / deceleration torque component current value and mechanical loss component output from the current function disassembly circuit. The current value and the tension current value are displayed, the acceleration / deceleration torque current value is multiplied by a predetermined function to output the tension function value, and the difference tension value obtained by subtracting the tension function value from the tension setting value is calculated. Output to the tension control circuit.

[0008]

EXAMPLE An example of the present invention will be described below. In FIG. 1, 2 is a calendar roll that polishes the surface of the paper 1 to polish it, 5 is a roll drive motor that drives the calendar roll 2, 7 is a roll control device that controls the rotation speed of the roll drive motor 5, and 3 is a calendar. It is installed in the latter part of roll 2,
A reel drum for winding the calendered paper 1; a drum driving electric motor 6 for driving the reel drum 3; a drum controller 8 for controlling the rotation speed of the drum driving electric motor 6; The speed setting device 10 that gives the rotation speed is a draw setting device that determines the draw setting value by multiplying the speed reference value set by the speed setting device 9 by a predetermined speed ratio, and 16 is the calendar roll 2 and the reel drum 3. A tension setter for predetermining the tension of the paper 1 generated between the tension setter and a tension control circuit for outputting a tension control signal based on the tension set value output from the tension setter 16.
Reference numeral 21 is an adder for adding the tension control signal and the draw set value, and 20 is a torque feedback obtained from the drum controller 8 by differentiating the addition signal value output from the adder 21, correcting it by a function generator, or The current / function decomposing circuit 20 outputs the acceleration / deceleration torque component current value, the mechanical loss component current value, and the tension component current value by subtracting the value, and 15 is the acceleration / deceleration torque component current output from the current function component decomposition circuit 20. value,
A current indicator that displays the mechanical loss current value and the tension current value, 17 is a function generator that multiplies the acceleration / deceleration torque current value by a predetermined function and outputs a tension function value, and 22 is a tension set value Is a subtracter that outputs a differential tension value obtained by subtracting the tension function value from the tension control circuit 18, and detects the current value of the current of the electric motor that drives each roll of the reel section and the reel section preceding the reel section. Then, the current value detected by the control device, the speed reference given to the electric motor control device, CD ² calculated from the moment of inertia of the load roll driven by the electric motor, and each data of the mechanical load applied to the motor the previously measured, acceleration and deceleration amount from the state of the current speed of CD ^2, by calculating the mechanical load caused by mechanical load, main current motor torque feedback In a controller with a mechanism to calculate another configuration, the tension value between the rolls is calculated from the tension component torque of the reel section and the section in the preceding stage, and the tension value is used to calculate the tension The tension control device is characterized by performing feedback control.

That is, the present embodiment is different from the configuration of the electric motor control device in the system diagram of the conventional paper machine winding device control device,
An environment in which the tension generated in the reel drum is calculated from the torque component I and the reel drum diameter in the current configuration obtained by decomposing the current value of the section, and tension feedback control can be performed using the tension value. It is characterized by providing.

Then, the tension setting device 16 for setting the tension value is used in comparison with the structure of the control device for the winding section of the conventional paper machine.
A function generator 17 for calculating the tension from the calculated torque for the tension and a tension controller 18 for correcting the deviation of the tension are added.

A general formula for calculating the torque τ ^T for the tension from the current for the tension output to the current display device is shown below. (Because the torque is proportional to the electric current) τ ^I = K × I where K is the torque / current conversion constant and I is the tension component current.

The conversion formula for torque and tension is shown below.

T ^I = τ ^I / D where D is the reel drum diameter.

The tension value calculated by the above equation 2 is used as a feedback value, and the deviation from the tension setter 16 is used as the tension control device 1.
The correction can be made in step 8, and the product can be stably wound up without fine adjustment by the operator.

[0015]

According to the present invention, tension feedback control can be performed even in a system having a structure in which a tension detector cannot be attached, and automatic control can be performed to an optimum tension regardless of the operator. So you can always make a stable product.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a tension control device showing an embodiment of the present invention.

[Explanation of symbols]

 9 Speed setting device 10 Draw setting device 15 Current display device 16 Tension setting device 17 Function generator 18 Tension control device

Claims (1)

[Claims] 1. A calendar roll for polishing and polishing the surface of paper, a roll drive motor for driving the calendar roll, a roll control device for controlling the rotation speed of the roll drive motor, and a stage downstream of the calendar roll. Installed,
A reel drum for winding the calendar-processed paper,
A drum drive motor that drives the reel drum, a drum control device that controls the rotation speed of the drum drive motor, a speed setting device that gives a predetermined rotation speed to the roll driving motor, and a speed setting device that sets the rotation speed. A draw setter that determines a draw set value by multiplying a predetermined speed ratio to a predetermined speed ratio, a tension setter that pre-determines the tension of the paper generated between the calendar roll and the reel drum, and this tension A tension control circuit that outputs a tension control signal based on the tension set value output from the setter, an adder that adds the tension control signal and the draw set value, and an addition signal output from the adder Differentiate the value, correct it with a function generator, or subtract it with the torque feedback value obtained from the drum controller to obtain the acceleration / deceleration torque component current value, Of the current loss component and tension component current value, and the acceleration / deceleration torque component current value, mechanical loss component current value and tension component current value output from this current function component decomposition circuit. A current indicator for displaying, a function generator for multiplying the acceleration / deceleration torque current value by a predetermined function to output a tension function value, and a difference obtained by subtracting the tension function value from the tension set value. A tension control device for a paper machine, comprising: a subtractor that outputs a tension value to the tension control circuit.