Two-way discharging vertical powder grinder

Abstract

The invention discloses a two-way discharging vertical powder grinder. The two-way discharging vertical powder grinder comprises a discharge outlet, a classifier, a grinder body, a grinding disc, gear motors and motors which are sequentially arranged from top to bottom. A first grinding roller, a second grinding roller and a third grinding roller with the gradually-decreased diameters are distributed in the circumferential direction of the grinding disc from outside to inside. The first grinding roller, the second grinding roller and the third grinding roller are each connected to one motor through one gear motor. Each motor is connected with a control panel. A feeding device is arranged on the side of the upper portion of the grinder body and comprises a spiral conveying device arranged outside the grinder body and an inclined discharge net pipe arranged on the inner wall of the grinder body. The inclined discharge net pipe is of an L-shaped structure and is provided with a plurality of net holes with the gradually-decreased sizes from the feeding end to the discharging end. The grinding disc is of a step structure. According to the powder grinder, the powder grinding uniformity is good, the material grinding efficiency is improved, and meanwhile time and resources spent by multiple subdivided passes are saved.

Description

technical field [0001] The invention relates to the technical field of pulverizers, in particular to a vertical pulverizer with two-way discharging. Background technique [0002] The vertical roller mill integrates the functions of grinding, drying, classification (powder selection) and conveying, and has the advantages of high efficiency, low energy consumption, low abrasion, high operation rate, compact structure, small site and space occupation, low noise, The fineness of the product is easy to adjust and other obvious advantages, and it is more and more widely used in the grinding and ultrafine grinding of cement (raw meal, coal, clinker), metallurgical slag, materials, chemical industry and other materials. [0003] The grinding rollers of the traditional vertical roller mill are large rollers of the same size, and each grinding roller undertakes the functions of fine crushing, compaction and grinding. When there is a large block of material, the upper layer of larger ...

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Problems solved by technology

[0003] The grinding rollers of the traditional vertical roller mill are large rollers of the same size, and each grinding roller undertakes the functions of fine crushing, compaction and grinding. When there are lumpy materials, the upper layer of larger material blocks will appear to leave the grinding area, and the grinding roller only crushes, compacts and grinds the lower layer of smaller materials, so the grinding efficiency is low

[0004] Traditional groove-shaped grinding discs can only be surfacing for wear-resistant treatment. Not only is the manufacturing complicated, the production cycle is long, and the requirements for the material of the grinding disc are also high. Because the surface of the traditional grinding disc needs to be surfacing with a wear-resistant layer, the grinding disc must be cast Steel, the casting process is complicated and difficult (the fluidity of molten steel is poor during casting, and the production of large steel castings is difficult)

However, the machining of the grinding disc of the groove is complicated

[0005] At present, the grinding mechanisms of domestic vertical roller mills are mainly spherical grinding rollers and groove-shaped grinding discs, which are complex in shape, difficult to manufacture and high in cost, difficult and expensive to repair after wear, and low in grinding efficiency.

At the same time, due to the difficulty in repairing the grinding mechanism after wear and tear, the repair time is long, resulting in a low operating rate of the vertical roller mill

These shortcomings have affected the operating rate of the entire cement production line, affecting the operating rate and benefits of the cement production line

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