Universal chassis of paddy field working device driven with hydrostatic drive

Abstract

The invention relates to a universal chassis of a paddy field working device with a hydrostatic drive. A variable displacement piston pump is connected with an engine, the oil output port of the variable displacement piston pump is connected with four variable displacement motors through an anti-slip control valve group, and respective output shafts of the four variable displacement motors are connected with wheels through respective hub reduction gears; a steering system comprises a steering pump, the oil output port of the steering pump is connected with a steering device, and the steering device is connected with a steering oil cylinder; a functional pump of a functional working mechanism is connected with the engine, and the oil output port of the functional pump is connected with at least two working oil cylinders through a control member; the control member comprises a pressure compensation valve, a flow control valve and a shuttle valve, it is ensured by the pressure compensation valve that the amount of the flow passing through a variable throttle is proportional to the opening size, a spring bias pressure is set by the flow control valve to cooperatively regulate the outlet pressure of the pump with the maximum load, and the maximum loading pressure of at least two execution members is transmitted to a spring cavity of the flow control valve by the shuttle valve.

Description

technical field [0001] The invention relates to a general chassis of a paddy field working device, in particular to a general chassis of a hydrostatically driven paddy field working device, which belongs to the technical field of agricultural machinery. Background technique [0002] Paddy fields are planted in a large area in southern my country, and rice is one of the most important staple foods. Ensuring increased production and income of paddy field crops is of great significance to maintaining food supply and ensuring national food security. However, the rheological soil characteristics of paddy fields are complex, the mud foot depth is large, and the working environment is harsh. These unfavorable factors have increased the labor intensity of farmers and reduced operating efficiency. [0003] Paddy field machinery has been working in paddy fields with complex soil characteristics and deep mud footing for a long time. It is necessary to ensure its normal driving and oper...

AI Technical Summary

Problems solved by technology

Most of the existing paddy field mechanical chassis are traditional mechanical chassis, which can basically meet the requirements of paddy field work, but also have the following disadvantages: 1) Multi-stage gear transmission and shifting mechanism are used for transmission, the transmission system is complex and heavy, and the layout is fixed and single. Infinitely variable speed cannot be realized; 2) The power density is low, which does not meet the requirements of lightweight, and the speed regulation range is small; 3) The turning radius is large, which is not conducive to turning around; 4) The braking system is complicated, and a special friction braking device needs to be installed; 5 ) The impact load is large during shifting, starting and acceleration; 6) It is not conducive to the realization of automatic intelligent control, and remote control is difficult

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