拖拉机液压悬挂耕深电液控制系统设计与试验

Design and Experiment on the Control System of Electro-hydraulic Plow Depth of Tractor Hydraulic Hitch Mechanism

从拖拉机液压悬挂耕深电液控制系统原理出发,设计了一种以电液比例阀为主控制阀的耕深电液控制系统,建立该系统数学模型,分析其位控制和力控制特性,并进行了试验验证。试验结果表明:采用耕深电液控制系统,其位控制过渡时间为0.65s,静差为±1.5cm;力控制调节时间为7.5s;力位综合控制耕深为20cm时,耕深的波动范围为±1cm。能够满足农机具田间作业时耕深的控制精度和稳定性要求。

A tractor electro-hydraulic control system was designed and studied based on the plowing depth system＇s principle of tractor hydraulic hitch mechanism. An electro-hydraulic proportional valve was used as the master valve in this system. The mathematic model of the tractor electro-hydraulic control system was set up and then the characteristic of load control and position control was analyzed. Finally experimental research was performed. The experimental results showed that transient time of position regulation is 0.65 s, and its static error is 1.5 cm; the adjusting time of draft regulation is 7.5 s; the fluctuating scope is ± 1 cm, when the plowing depth is 20 cm in draft and position regulation. This system could meet the challenge of plowing depth control system in formidable natural conditions, and the object of uniform plowing depth and work stability were achieved.