JPH0322320Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a paper machine control device used to control the paper making/coating process in the paper industry, and in particular to a paper machine control device used for controlling the paper making/coating process to change the operating state of the process. Concerning improvements to screen display operations.

(Prior Art) The applicant manufactures a paper machine control device,
For example, detailed technical matters are disclosed in Yokogawa Technical Report Vol. 29, p. 195 (1985).

This paper machine control device matches paper quality to target values based on data such as paper basis weight, moisture content, and ash content measured by a detection end that the applicant calls a B/M sensor. It is controlled so that

In the papermaking/coating process, the opening of the raw material supply port called a slice lip is controlled by a slice bolt, the moisture content is controlled by a steam valve, and the paper thickness is controlled by an air nozzle. These actuators are usually installed at a plurality of points, for example, about 60 points, in the paper width direction, and the screen that displays and adjusts the amount of operation is called a profile control screen. When the operator specifies the amount of operation on this screen, the actuator of the paper making/coating process is controlled in conjunction with this.

On the profile control screen, the operation amount of the actuator is displayed as a bar graph, and the operation amount is also instructed. To be more specific,
Each actuator was provided with an up/down key, and the amount of operation was directly output to the actuator. For example, one operation of the UP key corresponds to increasing the valve opening degree by 1%. This correspondence of 1 time/1% is determined in consideration of the accuracy when operating the actuator and the average amount of operation per time in a steady state.

(Problem that the invention aims to solve) However, in unstable operating conditions such as paper changeovers and paper speed changes, the amount of operation of the actuator becomes larger than in a steady state, so the operation output to the actuator is displayed on the screen. If the actuator is operated in conjunction with the instruction operation, the number of actuator operations increases significantly, causing the actuator to become damaged more quickly. In addition, instructions are given to the process from time to time, but the papermaking/coating process has non-linearity, and the total difference between applying a small amount of operation many times and giving one large amount of operation is There was a problem that even if the amount of operation was the same, the response would be different, and operations that did not take into account quick response and robustness would make the process unstable.

This invention solves these problems,
It is an object of the present invention to provide a paper machine control device that independently performs operation output to an actuator and instructions on a screen, and provides a long life of the actuator and stable controllability.

(Means for Solving the Problem) The present invention that achieves the above purpose includes an operator's station that displays the status of the paper making/coating process and instructs the process to set target values;
This paper machine control device includes a field control station that controls the paper machine/coating machine based on target values instructed by the operator's station, and has the following configuration.

That is, the papermaking/coating process is provided with an actuator that increases or decreases the supply amount of steam, air, or papermaking raw materials, and a manipulated variable detector that detects the manipulated variable of this actuator.

In addition, the field control station includes a manipulated variable data buffer that temporarily holds the value of this manipulated variable detector, and a process control unit that outputs the manipulated variable to the relevant actuator based on the detected value of this manipulated variable data buffer and the specified target value. has been established.

Furthermore, the operator's station includes a manipulated variable storage unit that stores the current value of the manipulated variable of each actuator transferred from the relevant manipulated variable data buffer, a manipulated variable target setting unit that sets the target value of each actuator, and a manipulated variable target setting unit that stores the current value of the manipulated variable of each actuator transferred from the relevant manipulated variable data buffer. A manipulated variable display section that displays the target value set in the section and the current value held in the manipulated variable storage section; A manipulated variable target transmitter is provided to output an updated target value.

(Function) Each component of the present invention has the following function. The operation amount target setting section instructs the operation target value of each actuator. The operation amount display section compares and displays the current value and target value of the actuator to facilitate setting. The operation amount target transmitting section transmits the target value to the process control section at once after the target value setting for the entire actuator to be operated is completed. The process control unit simultaneously starts controlling each actuator.

(Example) The present invention will be explained below using the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 10 is a paper making/coating process, 20 is a B/M sensor that detects the operating state of the paper making/coating process 10, and 30 is a B/M sensor 2.
40 is a field control station that controls the paper making/coating process 10 based on the detection of 0;
The operator's station monitors the operating status of the machine and provides a man-machine interface with the operator.

Next, details of each block will be explained. Reference numeral 11 denotes an actuator that increases or decreases the supply amount of steam, air, or papermaking raw materials; in detail, these include a slice bolt 12 that controls the supply of papermaking raw materials, an air nozzle 13 that controls paper thickness, and a steam valve that controls moisture content. It consists of 14 etc. A plurality of these actuators 12 to 14 are arranged in the paper width direction. 15 is each actuator 12
This is a manipulated variable detector that detects 14 manipulated variables.

31 is a profile data data buffer that temporarily stores the profile data transmitted from the B/M sensor 20 at a predetermined cycle; 32 is a manipulated variable data buffer that temporarily stores the value transmitted from the manipulated variable detector 15 at a predetermined cycle; 33 is the manipulated value (MV) to the actuator 11
In the process control unit that outputs, there are two cases in which speed-type output is performed using the deviation between the current value of the manipulated variable data buffer 32 and the target value instructed by the operator's station 40; There are cases where it outputs a shape.

41 is profile data/data buffer 3
A data storage section 42 holds the data transmitted from the data storage section 41, and a profile data display section 42 displays the data stored in the data storage section 41. Facilitate goal setting. Reference numeral 43 denotes a manipulated variable storage unit that stores the current values of the manipulated variables of each actuator 12 to 14, and is transmitted from the manipulated variable data buffer 32 at a predetermined cycle. 44 is a manipulated variable target setting unit that sets the target value of the manipulated variable of each actuator 12 to 14; 45 is a manipulated variable target setting unit 4;
A manipulated variable display section that displays the target value set in step 4 and the current value held in the manipulated variable storage section 43 facilitates setting of the manipulated target value. Reference numeral 46 denotes a manipulated variable target transmitter that outputs an updated target value to each actuator 12 to 14 at the same time;
After the target value setting for each actuator 12 to 14 is completed in step 3, the operator issues an instruction, for example.

The operation of the device configured in this manner will be described next. FIG. 2 is an explanatory diagram of the data structure, in which a slice is illustrated as an actuator. In the figure, there is a profile control screen in the center, and a bar graph display of the slice bolt operation amount and profile data of the paper being manufactured are displayed on the screen.
There are also up/down keys and a transmission command key.

The total number of slices to be controlled is N, and the total number of slices to be controlled on the screen is M (N>M). The operator sets the operation target value for each slice on the control screen by operating the up/down keys. After completing the settings, operate the transmission command key to transmit data from the operator's station 40 to the field control station 30. Note that even if an input error is made, it can be canceled, and the target value will not be instructed to the actuator simply by operating the up/down keys.

The field control station 30 measures the amount of operation of each slice and transmits it to the operator's station 40 for all actuators at regular intervals (for example, every 10 seconds). The operator's station 40 displays the current manipulated variable for the slice displayed as a bar graph on the screen.

FIG. 3 is a corresponding diagram of the entire paper machine control device. Since the bar graph display on the profile control screen is provided corresponding to the slice of the paper making/coating process 10, the operator can easily operate the paper making/coating process 10.

(Effects of the invention) As explained above, the invention has the following effects.

After the target value setting is completed, the updated target value is transmitted to each actuator, so the number of actuator operations is reduced, which reduces damage to the actuator.

Since the required amount of operation is sent to the actuator at once, control that takes into account the nonlinearity of the process becomes possible through the operator, and the control becomes stable.

As in the example, if the amount set once in the manipulated variable target setting section is the average manipulated variable in the stable state of the process, the manipulated variable output to the actuator in the stable state is simple, and it is easy to output the manipulated variable in the transient state. When outputting such a large amount of operation, the setting work can be repeated several times to instruct the actuator all at once, improving controllability.

Field control and
The communication load between the station and the operator's station is reduced.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a data structure, and FIG. 3 is a correspondence diagram of the entire paper machine control device. 10... Paper making/coating process, 11... Actuator, 15... Operation amount detector. 30...Field control station, 32...Manipulated variable data buffer, 33...Process control unit.
40... Operator's station, 43...
Manipulated amount storage section, 44... Manipulated amount target setting section, 45
. . . Manipulated amount display unit, 46… Manipulated amount target transmitter.

Claims (1)

[Scope of Claim for Utility Model Registration] An operator's station that displays the status of the papermaking/coating process and instructs the process to a target value, and a paper machine/coating machine that operates based on the target value instructed by the operator's station. A paper machine control device equipped with a field control station to control an actuator that increases or decreases the supply amount of steam, air, or paper raw materials in the paper making/coating process, and a manipulated variable detector that detects the manipulated variable by this actuator. /A manipulated variable data buffer provided in the coating process to temporarily hold the value of this manipulated variable detector, and a process control unit that outputs the manipulated variable to the relevant actuator based on the detected value of this manipulated variable data buffer and the instructed target value. The field control station is provided with a manipulated variable storage unit that stores the current value of the manipulated variable of each actuator transferred from the relevant manipulated variable data buffer, a manipulated variable target setting unit that sets the target value of each actuator, and this manipulated variable target setting unit. A manipulated variable display section that displays the target value set in the section and the current value held in the manipulated variable storage section; Operators can control the manipulated variable target transmitter that outputs the updated target value.
1. A paper machine control device, which is installed in a station and is characterized in that after the target value setting unit for each actuator finishes setting a target value for each actuator, a target value for each actuator is simultaneously outputted to each actuator via a target target transmitting unit.