Research For Hydraulic Control System Of High Clearance Self-propelled Sprayer

With the rapid development of science and technology and modern agriculture,more and more plant protection machinery are applied to agricultural production. Plantprotection machinery can not only improve crop yield and quality, but also make peoplefree from heavy agricultural work, also play an important role in the aspect of healthand epidemic prevention. Plant protection machinery has become an indispensableimportant component in the modern agricultural development and an important drivingfactor to realize agricultural modernization.Plant protection machinery in China has experienced a long process ofdevelopment for starting from scratch, has obtained some achievements, but Comparedwith the developed countries still has certain gap and cannot meet the needs of thecurrent agricultural development. At present our country mechanization of agriculturearea operation level is not high, the traditional manual type plant protection machinerystill occupies a major position, in particular, growing crops such as cotton and cornapplying pesticide problems to be solved. In view of the current situation of plantprotection machinery in China, this paper designed control system for high clearanceself-propelled sprayer.First of all, the steering system should be analysed and reseached. In order toguarantee the spraying mechanism worked normally and efficiently, it should realizefour-wheel steering, and it also should meet Ackermann steering geometry to ensure thefour-wheel steering system worked stably The four hydraulic cylinder control steeringfunction can enhance the system’s practicability and reduce the cost, and it can realizethe function of front-wheel steering, four-wheel steering and In situ around the car.The second, for the walking system, closed hydrostatic system can simplify thestructure and improve the working reliability of the system. Four motor directlycontrolling four wheels can realize four-wheel drive and front-wheel drive.The last, the rise and fall of cab and frame system is controlled by the valve controlcylinder technology, using two three of four electric hydraulic directional valves controlled two secondary telescopic hydraulic cylinders complete the rise and fall of caband frame function. Drug development and curl also used technology of valvecontrolling cylinder. The ordinary hydraulic cylinder control big wings and theswinging cylinder control the small wings.The whole hydraulic system of spraying machine powered by two two-wayquantitative pumps and controlled by the electro-hydraulic control technology. Thewhole and part of the principle diagram of the hydraulic transmission and controlsystem block diagram and flow chart is drawn. The system of spraying machine iscontrolled by a central controller which is a single chip microcomputer to integrate thevarious control procedures and realize control function.