分析了在大型筛机上采用普通电机直接驱动激振器方法所存在的问题，提出用液压控制系统解决问题的方案。
This paper analyzed the problems related to the large vibrating screen directly driven by ordinary motor, and raised the idea of using hydraulic control system to tackle the problems.
通过测试与分析，排除了液压系统元件本身的问题，认为卷筒变径设计缺陷和液压系统程序控制缺陷是故障产生的直接原因。
By test and analysis, the direct reasons leading to failures are the defaults in designing coiler mandrel diameter change and controlling hydraulic system program but not the system parts themselves.
介绍泵直接传动的锻造液压机工作原理，对其控制机理、数学模型、控制策略进行了研究，并成功地应用于生产实践中。
The principle of forging hydraulic press by pump direct drive is introduced in this paper, the math model, control method and strategy are also described.
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