A pre-grinding vertical mill

Abstract

The invention relate to a pre-grinding vertical mill. The pre-grinding vertical mill comprises a main motor, a retainer ring, a discharge device, a millstone, an exhaust device, grinding rollers, a scraper plate and a hydraulic spring, wherein the millstone is provided with the retainer ring; materials move uniformly toward the side of the retainer ring under the effect of centrifugal force (the centrifugal acceleration is 1.0-1.8g) of the millstone, and enter a grinding region formed by the retainer ring, the grinding rollers and the millstone; the mill rollers transmit grinding force F provided by the hydraulic spring to the materials, so that all the materials are subjected to pressure and shear grinding under the condition of high specific pressure (1.0-1.8MPa) per unit, and pass over the retainer ring, and are discharged out of the mill via the scraper plate, so that high energy utilization ratio and relatively low equipment dimension, weight and maintenance expense can be obtained; compared with the pre-grinding vertical mill with low specific pressure (0.6-1.0MPa) per unit, the energy consumption per unit is reduced by more than 30-50%; compared with a roller press, the energy consumption per unit is reduced by more than 15-20%, and the pre-grinding vertical mill has an obvious energy-saving effect.

Description

technical field [0001] The invention relates to the field of construction machinery equipment, in particular to a pre-grinding vertical mill. The invention can be used in cement building materials, coal, steel, thermal power generation and other industries. Background technique [0002] Materials with a hard and brittle nature are usually ground in ball mills, and this year this is increasingly being done in vertical mills and roller presses. [0003] Compared with patent 1 (application number: 200680007193.7, application date: 2006.1.30, name: roller press, announcement date: 2010.3.24), the disadvantage is that the roller press works at a very high specific pressure, resulting in a wear-resistant roller surface life It needs to be repaired only about 3000h, and the maintenance cost is high; the edge failure caused by material leakage on both sides reduces the grinding efficiency by 20-30%, increases the circulation volume, and increases the unit energy consumption; in addi...

AI Technical Summary

Problems solved by technology

[0003] Compared with patent 1 (application number: 200680007193.7, application date: 2006.1.30, name: roller press, announcement date: 2010.3.24), the disadvantage is that the roller press works at a very high specific pressure, resulting in a wear-resistant roller surface life It needs to be repaired only about 3000h, and the maintenance cost is high; the edge failure caused by material leakage on both sides reduces the grinding efficiency by 20-30%, increases the circulation volume, and increases the unit energy consumption; in addition, the high specific pressure design causes the roller press to Difficult to scale up

[0004] Comparative patent two (application number: 200880120463.4, application date: 2008.9.25, name: roller mill, announcement date: 2012.10.17) the existing raw material roller mill adopts low specific pressure (<1MPa), low centrifugal acceleration (< 1g) design, resulting in low yield and throughput, that is, low energy utilization rate, large equipment size, and high maintenance costs

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