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Printing and dying equipment, such as mercerizing machine, setting machine,scouring and bleaching machine etc, in the production process, some of the keyposition requires the use of additives to auxiliary dyeing. The traditional process ismainly rely on manual operation to achieve the ratio of certain additives concentration,then the dye liquor is transported to the scene of printing and dying by human, thismethod is not only labor-intensive, low productivity, serious waste of additives, aidsconcentration and modulation is also poor stability, the modulation of additivesconcentration stability is also poor, cannot guarantee the quality of products.Therefore, the distribution auxiliaries and automation has become one of theimportant direction of research and development of dyeing and finishing equipmentindustrial automation.This thesis mainly focuses on the research on the automatic control system ofdying auxiliaries. First, this paper has a detailed analysis of the status of the additivesdistribution equipment at home and abroad. For the existing conditions andtechnology, design of a programmable controller as the core additives automaticdistribution control system.Secondly, focusing on the overall program of the additives distribution controlsystem, described in more detail on the key mechanical control system: weighingbarrel, sensors, motors, additives distribution system piping constructed. At the sametime made a brief introduction for selection of hardware.Third, in the electrical control, design a circuit diagram of the system’s input andoutput. Combined with the requirements of the production process, design the overallprogram flowchart software, including the self-test step, weighing step, the mixingstep, the transport step, At the same time precision control, using a reduced errorlearning method to solve the liquid in the pipe flow lag, and derived a mathematical formula to increase the accuracy of the system control.When weighing, the liquid level of storage tank has an effect on the velocity ofthe pipeline auxiliaries, in order to ensure that the additives flow rate constant, thedesign uses a PID regulator to control the liquid level of the storage tank toautomatically calculate the changes in the test input, set the PID regulator parameters.Finally, the additives on the development of the automatic were tested. Theexperimental results show that this system’s hardware and software are reliable, ableto adapt to the continuous operation of the dye vat production line equipment overallcontrol accuracy of the dye vat operations process.
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