Outer circulation vertical roller mill

Abstract

The invention discloses an outer circulation vertical roller mill. A partition board is arranged on the middle upper portion of a mill shell and divides the mill shell into a powder milling barrel anda powder screening barrel. A powder screening machine is arranged in the powder screening barrel. An outlet of a powder screening coarse powder hopper of the powder screening machine penetrates through the partition board to extend into the powder milling barrel. The lower portion of the powder screening barrel is provided with air inlets. A grinding disk and grinding rollers are arranged on thelower portion of the powder milling barrel. A spray port ring is arranged between the outer circumference of the grinding disk and the mill shell. The lower portion of the spray port ring is providedwith a discharge ring channel. The bottom of the discharge ring channel is provided with a discharge port. A material is fed into feed pipes of the powder screening machine in the powder screening barrel through a material elevator mechanism at the discharge port. Through the outer circulation vertical roller mill, a mode that the material is conveyed completely with effort is changed thoroughly to a high-efficiency mechanical centralized conveying mode, and energy consumption can be greatly reduced. Moreover, two independent powder milling systems and a screening system are organically combined, the space is saved, and the civil engineering cost is greatly saved.

Description

technical field [0001] The invention relates to a material bed grinding equipment, in particular to an external circulation roller vertical mill. Background technique [0002] In the grinding production operation, a large number of coarse particles need to be ground into fine powder, and the particles in the fine powder need to be separated according to a certain particle size to become a qualified product. The equipment for these grinding operations is the grinding equipment. At present, common grinding equipment includes tube mill, roller press and roller vertical mill. Since the roller press and the vertical roller mill belong to the material bed grinding equipment, their grinding efficiency is higher than that of the tube mill, so they have been widely used in the grinding operation. [0003] Roller vertical mill is a kind of grinding machine that uses the principle of material bed grinding to grind materials. It has been widely used in cement, coal, electric power, me...

AI Technical Summary

Problems solved by technology

Because all materials need gas to be lifted and transported, and the air duct of the gas in the vertical mill is in an irregular channel, there are various eddy currents and other phenomena, the wind speed is high, and the resistance is large. In actual production, due to a large number of The powder material needs to be lifted, and the dust concentration on the grinding table is very high, resulting in a large gas resistance. During the material lifting process, if the system air volume fluctuates, the balance of the gas pressure will be broken, and the suspended material will also appear. Collapse and other phenomena, resulting in abnormal vibration of the grinding roller and jump stop

This method of relying on gas to lift and transport materials consumes a lot of energy and also brings other unstable factors

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