Agitation in the form of conventional anchor, paddle, turbine, propeller, frame type, etc., stirring device in height and diameter is large, multi-paddle available, use special products even more complex MIG stirring. Stirring blade paddle part of the classification categories can follow paddle effect produced by the fluid flow patterns to points, can be divided into two types of blades - Axial and radial blade paddle. The so-called axial flow blades, refers to the major axis of the liquid discharge direction parallel to the stirring blade; auger-type blade that is a typical axial flow blades; so-called radial blades, the primary blade means Drain and stir the direction perpendicular to the axis. Blade Features: 1, anchor type, frame type used in low speed is generally between 60 to 300rpm, because considering the anchor type, frame type length more than a 3-5 m, the anchor of the shaft head, stirring shaft strength limited, high speed stirring shaft runout is relatively large, in particular by stirring the bottom shaking amplitude is large, even the inner wall of the reactor will encounter. While the viscosity of the material combined with the selection of the number of revolutions, speed low viscosity, the viscosity of the small number of revolutions of the appropriate high. 2, the turbine: blades quantity, variety, high speed, the fluid evenly by changing the vertical movement into a horizontal direction. 3, push: push-also called Propeller, often cast as a whole, the use of welding, forging and sleeve before welding, machining more difficult. Manufacture of static equilibrium experiments should be done. Available bushings, flat keys and fixing screws and shaft. Blade selection: selection before stirring, in addition to the material concerned has several phases, volume, density, viscosity, mixing requirements, etc. It should also be concerned about the reaction mechanism. Some of the reaction rate is determined by the reaction itself, such as some organic reaction itself is carried out very slowly, in such conditions to enhance (or diminish) the stirring effect on the reaction yield, reaction time has little effect; and some The reaction speed is mainly controlled by diffusion, the reaction itself is very quickly, in which case the effect is increased by stirring the reaction yield and the reaction time will have a very good improvement. Impeller design basics: 1, to determine the purpose of stirring: as liquid-liquid mixing, solid-liquid suspension, gas-liquid or liquid-liquid dispersion, the need to achieve heat absorption, extraction, dissolution, crystallization process purposes. Select paddle forms depending on process characteristics. 2, computing power stirring job: that is the mixing process performed when power required for 3, select motor power: after taking into account the efficiency of the calculated value should be greater than or equal to 1.5 times the operating power can be stirred. 4, to determine the minimum number of revolutions critical suspension: This is the critical number of revolutions revolutions minimum number of revolutions, rather than stirring the purpose of satisfying the agitator shaft. 5, according to the power selection and checking the stirring shaft, paddle stiffness and strength. 6, also consider using the coefficient and the carrying capacity of the gear reducer when equipped with deceleration devices. 7, the elongate shaft should also be considered for increasing the support, middle or bottom of the support. 8, but also consider the installation (or enter into the top or bottom side in), this is first determined.