A dilution water hydraulic headbox dilution water valve control device and control method

Abstract

The invention discloses a dilution water hydraulic type flow box dilution water valve control device and a dilution water hydraulic type flow box dilution water valve control method. The dilution water hydraulic type flow box dilution water valve control device comprises a cross direction quantitative control computer, a dilution water valve control computer, a plurality of dilution water controllers and at most four dilution water valves connected with one dilution water controller, wherein the dilution water valve control computer obtains quantitative data of each area of finished paper from the cross direction quantitative control computer, and sends the quantitative data and auxiliary control signals to the plurality of the dilution water controllers through an RS485 bus, single chip computers in the dilution water controllers resolve respective operation tasks through internal cross direction quantitative control algorithms, valve opening degrees are adjusted, the dilution white water flow amount is adjusted, and then the cross direction fixed quantify in each area is adjusted, and therefore instantaneity is strong. According to the dilution water hydraulic type flow box dilution water valve control device, the single chip computers and step drive chips are arranged in the dilution water controllers, the single chip computers use multiplex PWM (pulse width modulation) ports to generate high speed pulse signals needed by controlling the step drive chips, and multiplex analog quantity ports are connected with angular displacement sensors so as to directly collect valve position signals.

Description

technical field [0001] The invention belongs to the field of light industry technical engineering, and in particular relates to a dilution water hydraulic headbox dilution water valve control device and control method. Background technique [0002] In recent years, the quality of paper has been greatly improved, but at the same time the market has put forward higher requirements for paper quality. Quantitative quantity of paper is an important parameter to reflect the quality of paper, and it is also the most important controlled parameter in the automatic control system of papermaking. Quantitative control is to keep paper quantitative in both vertical and horizontal directions. At present, the problem of longitudinal quantitative control has been solved, but the effect of lateral quantitative control based on the local opening adjustment of the lip plate is not ideal. Therefore, a hydraulic headbox with a dilution water adjustment device emerges as the times require, whi...

AI Technical Summary

Problems solved by technology

This is a more reasonable way of quantitatively adjusting the banner, but its control system is difficult and the control strategy is complicated. Therefore, it has been monopolized by foreign companies such as Voith, Metso, and Valmet for a long time. The high price of foreign products and expensive after-sales service fees make domestic Many paper companies are discouraged

Dilution water valves are divided into two types: straight stroke and angular stroke, which are similar in mechanical structure, and the dilution water valve controller is the most important part of the dilution water hydraulic headbox banner quantitative control system. For many domestic As far as enterprises are concerned, there are still many key technologies that have not yet been broken, and they have to use foreign complete sets of chips to realize stacking wood assembly, which is expensive and hinders the progress and development of domestic high-speed paper machine technology. Although domestic companies are also engaged in research in this area, For example, Mianyang Tongcheng High-tech Co., Ltd. applied for the invention patent "Intelligent Control Device for Paper Banner Quantitative Dilution Water" (public number: CN102108651A); "Intelligent Actuator for Controlling Paper Banner Quantification by Dilution Water in Box" (Publication No.: CN103757968A), but they mainly made statements on the mechanical structure and network structure of the dilution water valve body, and for the composition of the dilution water valve controller and Lack of corresponding research on control strategies

Patent "Paper Banner Quantitative Dilution Water Intelligent Control Device" (publication number: CN102108651A): "Claim 1: The intelligent control box of the device receives the data from the remote control terminal through the CAN-bus interface module, and the central processing unit MCU inside the intelligent box of the device Calculate the aforementioned data and convert it into a signal to be executed by the actuator of the device” and the computer software control flow chart. It can be seen that the control box shown in this invention also needs the valve opening data sent by the remote control terminal. If the remote control Failure occurs at the end, which will cause the collapse of the whole system; the patent "An Intelligent Actuator for the Dilution Water of the Headbox to Control the Quantitative Paper Banner" (public number: CN103757968A): "The CAN bus communication described in claim 7 The module receives the given dilution water valve opening data of the paper banner quantitative control system", the system is highly dependent on the paper banner quantitative control system, the general banner quantitative control system is implemented by the computer, the opening of each dilution water valve All of them can be issued by the banner quantitative control system after calculation. If there are 100 dilution water valves, the banner quantitative control system needs to complete the calculation of 100 loops. The system has a large amount of calculation and is prone to errors. Once the banner quantitative control system fails, It will cause system disorder; coupled with the non-real-time nature of the Windows system, the processing speed will slow down with the increase of computing capacity, causing serious lag

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