Coarse powder pre-separation device for vertical grinding

Abstract

The invention discloses a coarse powder pre-separation device for vertical grinding. The coarse powder pre-separation device comprises a powder selecting housing, a lower housing, a feeding port, a middle housing, a cage rotor, and an inner cone. The powder selecting housing is arranged on the middle housing; the feeding port is inserted between the powder selecting housing and the middle housing;the cage rotor is inserted inside a second air guide blade; a first grinding unit is mounted in the bottom of the lower housing; and a second grinding unit is mounted outside the lower housing. The coarse powder pre-separation device for vertical grinding by the invention has the beneficial effects that: the device designs a coarse powder pre-separation device to solve the problem of too high internal concentration, in order to reduce the vertical mill pressure difference; the coarser particles which do not need to enter the powder selection machine are separated out in advance, and then fallinto the grinding disc, only the fine powder we need is taken to the classifier for sorting, thereby solving the problem that the internal concentration is too high, and reduces the energy consumption.

Description

technical field [0001] The invention relates to the technical field of vertical mills, in particular to a coarse powder pre-separation device for vertical mills. Background technique [0002] Vertical mill is a kind of grinding machine that uses the principle of material layer grinding to grind materials. It has been widely used in cement, coal, electric power and other industries. It is a full-air-swept mill, which pulverizes the material through the relative movement of the grinding roller and the grinding disc, and dries and lifts the finely ground material by hot air, and is classified in the mill by the grading device, and the coarse powder falls into the grinding disc. It is crushed again; the finished product is sent out of the mill by air flow and collected by a dust collector. Specific process: the materials entering the grinding process are extruded, move from the grinding disc to the edge under the action of centrifugal force, and sink to the nozzle ring, where t...

AI Technical Summary

Problems solved by technology

[0003] Due to the existence of a large amount of internal circulation in the production of vertical mills, the internal dust concentration is too high, which will lead to greater air resistance in upward movement, and the pressure difference of vertical mills is generally high, generally between 6000-10000Pa, so large resistance, it needs to consume a lot of energy consumption, which directly increases the rise of energy consumption. In view of the above problems, after in-depth research, there is this case

Images