Abstract
The old drawbead test bed, which can not satisfy the requirement of new experiment and research, has the problems such as seriously equipments aging, less test mode and high energy consumption. By adopting PLC control system based on the field bus (CAN-BUS) instead of relay control system in the new test bed, the new electric control system of drawbead test bed which makes the scope of the test bed capabilities expanded and the automation of experimental data processing improved, has been built. By means of improving from the traditional throttle loop to load sensing circuit which is consisted of the electro hydraulic proportional valve and load sensing pump, the hydraulic system has been improved to realize a flexible conversion of variety working conditions. By the study of energy saving characteristic experimentation, the energy saving effect of the new drawbead test bed based on electric proportional control system is much better than the old one, and the thought can be used in the similar products.
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