What are the types of agitators in the mixing unit?

1, pulp type agitator. The basic structure of the paddle agitator generally has four parts: slurry blade, key, collar and vertical shaft. Commonly used slurry blade is generally made of ordinary flat steel or angle steel, when the medium being stirred corrosive to steel, the material used is stainless steel or non-ferrous metals, or with covered rubber, epoxy or phenolic resin, glass fiber reinforced plastic and other materials covered on the outside of the paddle. The diameter of paddle stirrer is taken as 1/3~2/3 of the inner diameter of the reactor, the paddle should not be too long, because the power consumed by the stirrer is proportional to the fifth power of the paddle diameter, and the paddle should not be too long when designing, and it is generally taken as 1/3-2/3 of the inner diameter of the container. if the inner diameter of the reactor is too large, it can be designed as two or more paddles when the diameter of the reactor is very large with two or more paddles. If the stirred material is too deep, two or more rows of paddles can be used, mainly for small viscosity, fluidity, or fibrous. Crystalline dissolved liquid. 2、Frame and anchor agitator. Frame agitator is a vertical paddle will be horizontal paddle will become a rigid frame, so the strength is relatively high, stirring the material amount. Anchor stirrer can be regarded as the deformation of paddle stirrer, the shape of its bottom and the shape of the kettle under the head is similar to the structure of the anchor stirrer can be bent into the shape of the bottom of the flat steel or angle steel, all the parts are welded; the other is made into a loading and unloading type form, the stirring leaves are bolted together, so that the dismantling is more convenient. Special circumstances can be used as a whole forging or pipe welding, such as cast iron agitator and glass-lined agitator. 3、Propulsive agitator. Propulsive agitator due to its complex blade structure, generally using casting. Forged parts, to be welded, the need for forging molds and welding fixtures, processing is more difficult. Propulsive agitator to do for static balance test, the data can refer to the appropriate standards. The stirrer can be fixed with the shaft by the shaft sleeve with flat key (or fastening screws) or can be coupled with the expansion sleeve. The first paddle installed in the upper part of the reactor presses the liquid or gas downward; the paddle installed in the lower part pushes the liquid upward. Therefore, the installation direction of the two paddles is exactly the opposite, stirring can make the material in the reactor circulating flow, the role of volumetric circulation is mainly, the shear effect is small, up and down the tumbling effect is good. When there is a need to have a larger flow rate circulation, should be designed in the reactor deflector tube. The diameter of the propeller stirrer is about 1/4~1/3 of the inner diameter of the kettle, the tangential speed can be up to 5~15m/s, and the rotational speed ranges from 300~600r/min, and the stirrer is generally made of cast iron and cast steel. 4、Turbine agitator. Turbine agitator paddles are divided into two kinds of flat and curved leaves. General stirring leaves, and disk, disk welded to the sleeve. Agitator with shaft sleeve with flat keys and pins and shaft fixed or with expansion joint set. The main advantages of the turbine agitator mixing efficiency is higher, less energy consumption. Turbine stirrer speed is larger, tangential speed of about 3 ~ 8m / s, speed range of 300 ~ 600r / min. Therefore, it is more suitable for emulsions, suspensions and so on. 5、Special type agitator can be divided into two forms of spiral belt and planetary drive, spiral belt agitator is generally flat steel spiral winding, larger diameter, often made into several close to the inner wall of the kettle, and the kettle wall clearance is very small, and can be constantly and continuously attached to the kettle wall of the sediment scraped down. Planetary drive agitator suitable for viscous material mixing, with a high intensity of mixing, can be driven by a large number of material volume driven mixing, but the structure is complex. Application is relatively small.