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一、引言目前在煤炭和冶金矿山工业中,广泛使用振动筛;这类振动筛由于工作频率远远高于其系统的自振频率,所以工作非常稳定;具有较高的筛分脱水效率。但是振动筛在起动和停车过程中,必须通过共振区,往往引起振幅的异常增大,其振幅达到正常工作振幅的4～6倍,有时甚至8倍。例如,2ZS1756双轴惯性振动筛,工作双振幅为10毫米,而起动双振幅为25毫米,停车时的最大双振幅达到50毫米(图1)。DD1740单轴惯性振动筛,工作双振幅为6毫米,停车时的最大双振幅达30毫米。
I. INTRODUCTION Currently, shale shakers are widely used in the coal and metallurgical mining industries. Such shale shakers have very stable operation because of their much higher operating frequency than the natural frequency of their systems, and have high efficiency of screening dewatering. However, during the starting and stopping process, the vibrating screen must pass through the resonance zone and often cause an abnormal increase of the amplitude, which reaches an amplitude of 4 to 6 times and sometimes 8 times of the normal working amplitude. For example, the 2ZS1756 biaxial inertial shaker operates with a double amplitude of 10 mm and a starting double amplitude of 25 mm and a maximum double amplitude of 50 mm during parking (Figure 1). DD1740 single-axis inertial shaker, the working double amplitude of 6 mm, the maximum double parking amplitude of 30 mm.