1. Overview
today s domestic economy is the rapid development of electrostatic powder coating on the huge demand. Powder coating according to the different raw materials are mainly epoxy (E), epoxy polyester-type (M), polyester (P) and so on.
epoxy powder-type (E) powder coatings with excellent hardness and chemical resistance, high adhesion, good electrical insulation for electrical instruments, equipment and pipeline etc, require a higher coating;
epoxy polyester-type (M) of polyester powder coating system of environmental protection based on oxygen, to improve the film properties, resistance to over-bake and salt water spray, is becoming a widely used powder coating. It has excellent adhesion, corrosion resistance and impact resistance, the powder coating applied to household appliances, transport vehicles, instruments, and metal furniture, interior decoration and corrosion protection coating surface.
polyester (P) powder coating has excellent UV resistance and corrosion resistance. The coatings widely used in transportation vehicles, bicycles, agricultural machinery, construction, gardening equipment, pipes, outdoor supplies.
Thus, electrostatic powder coating is widely used in industries. Powder mixer, is to create static powder special equipment, so the control system directly determine the quality of its production plant products good or bad.
I produced a powder mixer using Schneider Electric s Twido PLC control system as the core of the system will be effective by the combination of the machine s single-barrel production increase, significantly increased degree of automation, electrical in manpower greatly reduced workload, control the whole machine to upgrade a notch.
2. System Description
control system consists of Twido PLC 40 point increase body temperature, CPU controller expansion modules, display text display for the HMI. Various signals indicative of the system, temperature control and uniformity of mixture to achieve the degree of effective control. Programmable controller through the acquisition of various sensing (temperature, photoelectric switch, limit switch, cylinder) of the signal, using a special process method, precise control of the implementing agencies to make entire device to achieve a more efficient automation. Control diagram is as follows:
3. Conclusion
compared to old models, new models have achieved more in the electrical part of the old customers. The introduction of new models Twido PLC electrical control system as the core, the features are as follows:
A. HMI four lines of Chinese display interface clear, simple operation, difficulty of use of operation of the operator.
B. Twido PLC temperature module with personalized settings, do not have to calculate the temperature conversion value, the software can capture the value of the module to set the volume works directly for programming convenience.
C. protection performance of the system more complete, more reliable system operation. Schneider Electric high quality products for the machine to obtain more value-added benefits.