Shaker it works: 
 ZF shaker uses a dual-electrode self-synchronization technology, general-purpose fast eccentric, adjustable amplitude vibrator. Through the coupling of tape were driving two unconnected vibrator synchronous reverse operation, the centrifugal force generated by the two groups of eccentric mass is superimposed along the vibration direction of the force, reverse centrifugal offset to form a single along the direction of vibration-induced vibration , so that the screen box artificial reciprocating linear motion.