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1987年秋季,我县西石榴村有6台东风-50型拖拉机出现过农具提升抖动的故障。抖动的频率多为每分钟50次,有的竟高达每分钟80次以上。检查后发现,这6台车的故障都是由于分配器内的单向阀密封不严所造成的。由于单向阀泄漏,破坏了油缸的密封,致使农具无“中立”位置,只有不停地“下降—提升”。于是,农具便频繁地抖动起来。由于农具不停地抖动,液压系统中的油液出现脉动,形成冲击波,加之泄漏是在狭小的缝隙中进行的,必将形成节流作用。这样,不仅会使液压系统的油温上升很快,而且还会使液压油泵经常接近满负荷工作,寿命大大降低。造成单向阀密封不严的原因是单向阀偏磨。当农具提升时,高压油打开此阀并经过此阀进入油缸。但
In the autumn of 1987, there were 6 sets of Dongfeng-50 tractors in West Pomegranate Village in our county that appeared to be aggravated by farm tools. Jitter frequency of more than 50 times per minute, and some as high as 80 times per minute or more. Inspection found that the failure of these 6 cars are due to the imperfect sealing of the check valve in the distributor. As a one-way valve leaks, undermined the cylinder seal, resulting in no “neutral ” position, only non-stop “drop - raise ”. As a result, farm tools often jitter up. As the farm tools constantly shaking, the hydraulic system of oil pulsation, the formation of shock waves, combined with the leakage is carried out in a narrow gap, will form a throttling effect. This will not only make the hydraulic system temperature rise quickly, but also make the hydraulic pump often close to full load, life expectancy greatly reduced. Check valve caused by lax sealing is one-way valve eccentric wear. When the implement is raised, high pressure oil opens the valve and through the valve into the cylinder. but