Remote Loaded Electro-hydraulic Control System Design And Research

At present, the homemade Loader is manipulated by manual work, which will baffle the development of its function and capability badly, and lead to heavy labor, working efficiency and quality depending on the manipulator's technology, it is prevented from working in the polluted fields by nucleus. At the same time, with the development of society, science and technology, the robotic and remote-control Loader become the research topic. However, the control accuracy of Loader's hydraulic system depend on the ON-OFF time of the common valve, the feedback come from worker observing the loader's motion. It lead to the lower control accuracy, and it can't fulfill the need of the robotic and remote control, so the research and design on electronic-hydraulic system fulfilling the need of self-determination control and remote control will become important, and it will provide the reference for robotic and remote-control engineering machinery, too. According to the example of designing the electro-hydraulic system for remote-control Loader, the dissertation will develop the research and design as represent followed using the designing theory of the latter-day mechatronic product:(1) According to the require of working command for common loader, the remote-control variable is represented, the framework of radio remote-control system is built, the function is expressed. At the same time, the program for communication based on CANopen protocol between remote-control equipment and controller is worked out.(2) After analyzing the virtue and flaw of kinds designing, the dissertation select the method for the electro-hydraulic proportional control system of the remote-control Loader where the proportional fluid valve or the proportional reducing-pressure valve control hatch of the multi-spool valve and the common electromagnetic change-direction valve control the direction of the spool of the multi-spool valve . Furthermore , it is used to the type ZL50 remote- control Loader successfully.(3) After establishing the static model of the multi-spool valve and analyzing the static properties of multi-spool valve and electro-hydraulic proportional valve, the rule representing the matching relation between multi-spool valve and electro-hydraulic proportional valve is found. It will provide the reference for the design of electro-hydraulic system of similarity engineering machinery under control of pilot valve.(4) In order to fulfill the need of intelligent loading ,the type ZL50 Loader equipment is selected as the research object, the mathematic model of radio remote-control Loader's electro-hydraulic proportional control system is established and its dynamic properties is analyzed by the software named MATLAB .The result prove that the system has quick response and good anti-jamming capacity, its stability is good ,too. The system can fulfill the need on remote-control function and self-determination control function.