Mixer machine is a mechanical device that utilizes mechanical force and gravity to evenly mix two or more materials. During the mixing process, the contact surface area of the material can also be increased to promote chemical reactions; It can also accelerate physical changes. Commonly used mixers are divided into three categories: gas and low viscosity liquid mixers, medium to high viscosity liquid and paste mixers, and powder and granular solid material mixers.

According to different working principles, mixers can be divided into gravity controlled mixers (such as cylindrical mixers, disc granulators, etc.), stirring mixers (such as plow mixers, paddle mixers, screw mixers, etc.), and high shear mixers. Gravity controlled mixers mainly rely on different body geometries or mechanical motion modes to generate complex material mixing movements in the particle system under the action of its own gravity. Stirring mixers have a stronger disturbance effect on particle materials, and generally use external mechanical force to stir the incoming materials to improve the degree of material mixing. The high shear mixer mainly uses high-speed rotating impellers to vigorously stir the granular materials laid on it to achieve the effect of material mixing. It is actually a special form of stirring mixer. Common mixers include horizontal pear knife mixers, spiral belt mixers, gravity free mixers, V-type mixers, etc.