Method for controlling flow of transmission control system of paper machine

Abstract

The invention discloses a method for controlling the flow of a transmission control system of a paper machine. In the method, a control system comprising a programmable control device PLC, a speed governing device and a field bus is used; the control operating flow of preparation, operation, creeping, shut-down, cleaning and fault treating functions, which is included in the transmission control system of the paper machine is modularized; according to the functions required to control by the transmission system of the paper machine, 10 to 50 subsection states are set, and the address indexed addressing mode is used for subsection state logic control of all subsections such as logic conversion, data treatment and speed / torque control switch; the PLC repeatedly controls the transmission system according to the steps of input sampling, program operation, output refreshing and under the support of a flow control module; and the speed governing device executes all functions according to the PLC output information transferred by the field bus. The method has the advantages of reliably and harmoniously controlling the operating speed, speed difference control, speed ratio adjustment and the like of the paper machine and facilitating the yield and the quality of the paper machine.

Description

technical field [0001] The invention relates to a transmission control flow method, in particular to a flow control method for a paper machine transmission control system. Background technique [0002] With the continuous development of industrial automation and the increasing requirements for production efficiency and product quality in the papermaking industry, the traditional process control method of individually controlling each motor of the paper machine transmission system can no longer meet the needs of high-speed, large-scale papermaking automation. The requirements of the production process require high-efficiency automatic synchronous control of multiple motors at the same time for better coordinated operation. The earliest synchronous control methods include analog amplifier synchronous control and electric chain synchronous control; the former has defects such as poor anti-interference and drift, while the latter has shortcomings such as inconvenient adjustment ...

AI Technical Summary

Problems solved by technology

The prior art PLC process control method for the paper machine transmission system adopts the method of combining function blocks to integrate the paper machine transmission into a special function block, which can be used more conveniently, but a special process control package must be purchased additionally, which is not only extremely expensive, but also increases The application cost is reduced, and there are the following deficiencies: 1. The pertinence is poor, the control blocks are only divided according to the function, and the sub-function calls are less; 2. The display content of the sub-section status is too small, which is not conducive to the operator's identification; 3. The parameter classification is not clear enough , which is not conducive to modification by maintenance personnel; 4. The versatility and portability are poor, and different control commands need to be compiled for the speed control devices of paper machines in different branches; 5. There are few protection process methods and poor security; 6. Fault diagnosis function weak

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