PVC-U molding profile extruder control system based on lonworks
By studying the dual-screw profile extruder used in PVC-U molding processing, presents a temperature computer control system in which a combined-control strategy of on-off control, fuzzy-control and integral-control were adaptive elected. The control system used Lonworks constructing a net to regulate the extruder's sub-areas temperature in line. App effect shows that the temperature control precision and the method of multi-subarea control in line with Lonworks filedbus has better effect than those sub-areas self-governed control, and can prevent PVC-U decompounding in the processing effectively, so the character of PVC-U manufacture could be improved.
Application of PLC to Temperature Control System in Extruder
The selection of both plastics material and plastics extrusion machine are very important during plastics extruding.The stability and accuracy of temperature control is extremely important in order to satisfactorily extrude plastics products.A method of temperature control system adopting PID algorithm,PWM(pulse width modulation) theorem based on PLC is dealt with,which is used in plastics extrusion machine.The hardware configuration and technology of software design are also given.The advantage of this method is its accuracy and reliability of temperature controlling.The result shows the overshoot is less than 3℃ and the precision reaches ±1℃ at stable state .
THE APPLICATION OF LONWORKS TECHNOLOGY IN TEMPERATURE CONTROL SYSTEM
A temperature control system based on the LonWorks technology is introduced in this paper. With Delphi, Neuron C and SQL Server, the hardware and software of the temperature control node and the software of the main computer is designed. In this system, the temperature curves can be built and downloaded to every node. The log of the history temperature storing in the nodes can be uploaded to the main computer and the temperature of every node can be looked over on the main computer.