The machine consists of screen box at material inlet and outlet, vibrator and shock absorber. There are 4-6 sets of flexible rubber shock absorber connected between base and screen box in up-down order. Centrifugal force is generated upon starting the machine. Control shock absorber against amplitude eccentric device correspondingly for best pertormance and material screening process in throwing vibration and loose. It is the ideal choice for pharmaceutical, food, chemical, metallurgy and electronic industries.