| High speed on/off valve is an excellent drive-magnifying element which has been developed since 1980's , it has many merits such as high response speed , good ability of resisting contaminated oil and capability of assorting well with electrocircuit. yet, most existing high speed on/off valves use electromagnet as their electicity-mechanism conversion element, and good performant electromagnets have to be imported from other countries, in such situation , it is difficity to make excelent high speed electromagnet valve made in our country, even if we can make good performant high speed electromagnet valve in our country, it still has the shortcoming of not high enough respond speed , too small placket and big volumeo In this thesis, a new high speed on/off valve is developed based on two types of existing valves, this new valve has higher respond speed, a little big placket and little volume o For the new valve, several main task was made out as below:a) Several types of high speed on/off were first analyzed, then the basic performance of the actuator of the new valve was analyzed .b) The design of the new valve: for the displacement of the actuator, hydraulic magnify is used, and the stracture that has comparatively motion beteen harness and body and comparatively stillness between harness and body is adopted .The static characteristic of the new valve and also its dynamic characteristic, the factors that affect the valve's characteristic are analyzed .c) To create the PWM signal that drives the new high speed on /off valve, the currency PWM- confection of intel 80C 196MC is used, and the voltage ,power magnify electrocircuit that used for the actuater's dynamic application is chosed and designed .d) In the end , the new high speed on/off valve is applied to the vavle-control-vat systerm, and the controlling circuit is given .The developments of piezoelctronic high speed on/off valve and its application to other hydraulics systerm can be based on this little thesis . |
