Charles Ross & Son Co. recently designed the VersaMix model VMC-150, a custom 150-gal triple-shaft mixer with special automation and safety functions. Six pneumatic clamps rated for 4,000 lbs each provide remote locking of the mix vessel to the mixer cover, designed for 29.5”Hg vacuum and 5 psi internal pressure. The clamps also function as redundant limit switches, allowing for operation only when secured. In addition, the VMC-150 includes automated valves for powder feed and CIP liquids, RTD multi-point temperature sensor, built-in vacuum pump assembly, load cell system, and centralized HMI.
The company’s triple-shaft mixers typically include three independently driven agitators: a high-speed saw-tooth dispersing blade for quick product wet out, a three-wing anchor for efficient transport of viscous product throughout the mixing zone, and a third shaft that is frequently a high-shear rotor/stator homogenizer for emulsification. The pictured VMC-150 features a helical auger screw for submerging floating agglomerates. When reversed, the auger screw surfaces air pockets, resulting in decreased batch cycle time. The sides and bottom of the mixing vessel are jacketed and insulated for operation up to 100 PSIG at 250°F.
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