High-effective flour screening machine with wide size distribution of particles

Abstract

The invention provides a high-efficiency powder-selecting machine with wide particle diameter distribution. The powder-selecting machine comprises a shell body, a cage-type rotor, a feed spreading tray, a central wind pipe and a coarse powder cone; the central wind pipe is arranged on the upper part of the shell body; the lower part of the shell body is provided with the feed spreading tray and the rotor; a wind inlet and a feed inlet are arranged on the shell body; the lower part of the rotor is provided with the coarse powder cone; a semiannular collecting hopper of a secondary sorting device is arranged on the upper part of the coarse powder cone; a lower mouth of the collecting hopper is communicated with an upper mouth of a four-way joint through a wind locking valve; two side mouths of the four-way joint are connected with a separator and secondary wind respectively; a lower mouth of the four-way joint is connected with the wind locking valve; an upper mouth of the separator is connected with a wind outlet pipe; and a lower mouth of the separator is communicated with an overflow valve through the wind locking valve. The high-efficiency powder-selecting machine can once sort out fine powder, finer powder and coarser powder needed by cement with wide particle diameter distribution, and improve the particle distribution of a sorted powder body so that water amount needed by the cement is reduced, improve the compatibility between the cement and an additive and the working performance of the cement and reduce energy consumption and production cost.

Description

technical field [0001] The invention relates to a powder selecting device, in particular to a high-efficiency powder selecting machine with wide particle size distribution suitable for cement circular flow grinding. Background technique [0002] At present, ball mills are generally used for cement grinding, which can be divided into open flow type and circular flow type according to the production process. The open-flow mill is to mix the clinker and the admixture in proportion, and then grind them together. The powder after grinding can be directly used in cement production without powder selection; however, the open-flow mill has high energy consumption and low output. The production cost is high and has been phased out. The circular flow mill is widely used in the grinding system because of its low energy consumption, high system output, which is conducive to large-scale and improvement of labor productivity per capita; however, the powder after the circular flow mill ne...

AI Technical Summary

Problems solved by technology

In recent years, with the development of high-efficiency powder separator technology, the separation accuracy of powder separator is getting higher and higher, the particle distribution of cement is getting narrower and narrower, the proportion of mixed materials is low, and the water demand of cement is too large. The compatibility of the cement is poor, and the working performance of the cement is reduced

In order to change the particle size distribution of cement and improve the working performance of cement, some factories are forced to change the circular flow grinding system into an open flow grinding system, but the open flow grinding is different from the circular flow grinding in terms of energy consumption and large scale. Incomparable; there are also some manufacturers that first grind part of the mixed material separately to produce some powders with coarser particle sizes, and then add these coarser mixed material powders to the cement produced by circulating powder , so as to change the particle distribution of cement. Although this is very effective in changing the particle distribution of cement, it also makes the cement grinding system very complicated and greatly increases the investment.

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