Application and classification of mixers in pharmaceutical field

As we all know, the nature of pharmaceutical industry is relatively special, and the quality requirements for pharmaceutical equipment are also very high Errors in any link may lead to drug quality problems, leading to serious consequences The mixer is a kind of machine which uses mechanical force and gravity to mix two or more materials evenly Hybrid machinery is widely used in various industries and daily life The commonly used mixers are divided into four categories: gas and low viscosity liquid mixers, medium and high viscosity liquid and paste mixers, thermoplastic material mixers, powder and granular solid material mixers Gas and low viscosity liquid mixer is characterized by simple structure, no rotating parts, small maintenance and low energy consumption This kind of mixing machine can be divided into four types: air mixing, pipe mixing, jet mixing and forced circulation mixing Mixer accessories are mainly made of wear-resistant alloy materials, including high-speed mixing scraper, mixing wing, wear-resistant lining plate, mixing arm, mixing shovel, planetary shovel, mixing plough, mixing rod, mixing rake and other medium and high viscosity liquid and paste mixing machinery, which generally has strong shear function Thermoplastic material mixing machinery is mainly used for mixing thermoplastic materials and additives; powder and granular solid material mixing machinery is mostly intermittent operation, but also includes mixing and grinding machinery, such as wheel rolling machine The moving parts of the mechanical agitator will also shear the liquid when rotating When the liquid flows through the wall of the agitator and various fixed components installed in the container, it will also be subject to shear These shear effects will cause many local eddy diffusion For the liquid with different density, different composition and immiscible with each other, the shear effect and strong turbulence caused by agitation will tear the liquid with high density into small droplets and make them evenly dispersed into the main liquid The maintenance and operation steps of the mixer are as follows: ① the machine needs to be used frequently, and the reducer must be replaced with new oil every three months When replacing, the reducer should be cleaned and added with new oil ② the equipment and parts shall be inspected 1-2 times a month The inspection parts are worm gear, worm, bearing and oil seal Whether the operation parts are flexible and whether the fasteners are loose shall be handled in time in case of any abnormality ③ during the use of the machine, if it is found that the machine vibrates abnormally or makes abnormal sound, it shall be stopped immediately for inspection ④ electrical control parts shall be kept clean and sensitive, and any fault found shall be repaired in time ⑤ when assembling and disassembling the mixing slurry, it shall be dismantled gently, installed stably and placed gently to avoid deformation and damage ⑥ after the use of the machine, the residual materials of all parts of the machine shall be brushed If the machine is out of service for a long time, it must be wiped and cleaned completely The surface of the machine parts shall be coated with anti rust oil and covered with tarpaulin.