FRANLI sand mills are widely used in coatings, inks, pesticides, dyes, inkjets, functional ceramics, nano-powders, food, batteries, and other industries. The sand mill is mainly composed of a motor, a transmission device (such as a hydraulic coupling), the main shaft, a grinding cylinder, a dispersion device, a separation device, a feeding system, a shaft seal, a frame, a running protection device, and a grinding and dispersing medium. The operation protection of the grinding machine can be realized by the micro-intelligent electronic technology of relay and programmable controller.