Design and application of electric control system on pattern drawing machine

WANG Tao， CHEN Guo-jin， NI Jing
（School of Mechanical Engineering， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： The pattern drawing machine is the key equipment used in the processing of resin sand molding. Aiming at the low accuracy and efficiency of curent pattern drawing machines， a hydraulic system and a electrical control mode which adopted electro-hydraulic proportional synchro-drive control were designed， combined with working principle and technological feature. Then the control software was intrduced which based on Siemens S7-300 PLC system and Borland C++ Buider. Finally， practical application on the proposed system was done. The practical application results show that the proposed system could obtain preferable accuracy， dyuamic and synohronous drawing accuracy with double cylinders is less than 2 mm， steady and synchronous driving accuracy is less than 0.1 mm， and the system works stability， so as to meet the technological requirement.
Key words： pattern drawing machine； hydraulic system； electric control