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最近几年,农用运输车在我国广大农村已普遍使用,特别是带有液压自卸装置的农用运输车更受农民欢迎。但是,这种自卸车在使用中普遍存在着举升时间过长的问题,即举升时间超过20秒(农用运输车尚无国家有关标准,目前多采用汽车标准)。一般认为这是液压系统中油泵的排量不够或是油泵的转速没有达到额定转速的原因所致,其实并非完全如此。按照《机械设计手册》中对液压系统吸油管的选择原则,其管内流速应小于或等于1.5～2.0米/秒(一般多取1米/秒以下)。但目前的农用运输自卸车多使用CB306(或
In recent years, agricultural vehicles have been widely used in rural areas of our country. Especially, agricultural vehicles with hydraulic dumps are more popular with peasants. However, this dump truck is commonly used in the lifting time is too long, the lifting time of more than 20 seconds (no standard agricultural transporter, the current use of car standards). Is generally believed that this is the hydraulic system, the pump displacement is not enough or the speed of the pump did not reach the rated speed due to the fact, this is not entirely true. According to the selection principle of the suction pipe of the hydraulic system in “Mechanical Design Manual”, the flow velocity in the pipe should be less than or equal to 1.5-2.0 m / s (usually take more than 1 m / s). However, the current use of agricultural dump trucks to use more CB306 (or