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CN-121988428-A - Vertical roller mill

CN121988428ACN 121988428 ACN121988428 ACN 121988428ACN-121988428-A

Abstract

The invention discloses a vertical roller mill, which comprises an outer shell, an inner shell, a powder screen assembly, a sorting assembly and a circulating assembly, wherein the inner shell is arranged in the outer shell and sleeved outside a millstone of the roller mill, an upper air channel is formed between the inner shell and the outer shell, the upper end of the upper air channel is communicated with a discharge hole, and the lower end of the upper air channel is communicated with an air inlet through the inner shell. The powder screen assembly comprises a fixed ring and a rotating ring which are positioned below the grinding disc, the fixed ring is arranged on the inner shell, the rotating ring is arranged on the rotating shaft, a powder screen channel is formed between the fixed ring and the rotating ring, and the input end of the powder screen channel is arranged opposite to the outer edge of the grinding disc. The sorting assembly comprises a sorting disc and a scraping piece, wherein the sorting disc is arranged on the inner shell and provided with a sorting groove, the sorting groove is opposite to the output end of the powder sieve channel, the bottom wall of the sorting groove is provided with a sorting hole, the inner side wall of the sorting groove is provided with a coarse hole, and the scraping piece is arranged on the rotating shaft and is in contact with the bottom wall of the sorting groove. The circulation assembly is communicated with the coarse hole row and the feeding assembly of the roller mill. The roller mill can reduce abrasion of parts, noise and energy consumption.

Inventors

  • CHEN SHENGZHI

Assignees

  • 百色智成新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260330

Claims (10)

  1. 1. The vertical roller mill comprises an outer shell, a millstone and a rotating shaft, wherein the millstone is accommodated in the outer shell, the rotating shaft is rotatably arranged on the outer shell, the millstone is arranged on the rotating shaft, a discharge hole and an air inlet are respectively formed in the upper end and the lower end of the outer shell, and the vertical roller mill is characterized by further comprising an inner shell, a circulating assembly, a powder sieve assembly and a sorting assembly; The powder screen assembly comprises a fixed ring and a rotary ring which are positioned below the grinding disc, the fixed ring is arranged on the inner shell, the rotary ring is arranged on a rotating shaft, the axis of the rotary ring is not coincident with the axis of the rotating shaft, a powder screen channel is formed between the fixed ring and the rotary ring, and the input end of the powder screen channel is arranged opposite to the outer edge of the grinding disc; the sorting assembly comprises a sorting disc and a scraping piece, the sorting disc is mounted on the inner shell and provided with a sorting groove, the sorting groove is opposite to the output end of the powder sieve channel, the bottom wall of the sorting groove is provided with a plurality of sorting holes, the inner side wall of the sorting groove is provided with a coarse row hole, the sorting holes penetrate through the sorting disc along the axial direction of the sorting disc, and the scraping piece is mounted on the rotating shaft and is in contact with the bottom wall of the sorting groove; The circulating assembly is communicated with the row of coarse holes and the feeding assembly of the vertical roller mill.
  2. 2. The vertical roller mill of claim 1, wherein the separation disc is provided with a mounting hole penetrating through the separation disc along the axial direction of the separation disc, and two ends of the row of coarse holes are respectively communicated with the separation groove and the mounting hole; The circulating assembly comprises a collecting ring and a lifting machine, wherein the collecting ring is sleeved on the outer side of the rotating shaft and is contained in the mounting hole, a collecting cavity is formed in the collecting ring, and the collecting cavity is communicated with the row of coarse holes; The input end of the lifting machine is communicated with the collecting cavity, and the output end of the lifting machine is communicated with the feeding assembly of the vertical roller mill.
  3. 3. A vertical roller mill according to claim 2, characterized in that the scraping elements are arranged obliquely with respect to the radial direction of the classifying pan, the bottom of the row of coarse holes being higher than the bottom wall of the classifying tank.
  4. 4. A vertical roller mill according to claim 3, further comprising a radial bearing mounted to the bottom of the housing, the shaft being mounted to the radial bearing.
  5. 5. A vertical roller mill according to claim 4, characterized in that the top of the stationary ring is higher than the top of the grinding disc, and the top of the rotating ring abuts against the bottom of the grinding disc.
  6. 6. The vertical roller mill of claim 5, wherein the sorting assembly further comprises an inner guide ring and an outer guide ring, the inner guide ring and the outer guide ring being mounted on the sorting tray and being disposed inside and outside the sorting tank, respectively; From the bottom to the top of interior guide ring, interior guide ring's outer wall orientation interior guide ring's inboard slope, from the bottom to the top of outer guide ring, outer guide ring's inner wall orientation outer guide ring's outside slope.
  7. 7. The vertical roller mill of claim 6, further comprising a dynamic powder concentrator, wherein the dynamic powder concentrator is disposed between the grinding disc and the discharge port, an input end of the dynamic powder concentrator is communicated with the upper air duct, an air outlet of the dynamic powder concentrator is communicated with the discharge port, and a feed back cone of the dynamic powder concentrator is disposed opposite to the grinding disc.
  8. 8. A vertical roller mill according to claim 7, further comprising a base, a driving member and a speed reducer, wherein the driving member and the speed reducer are mounted on the base, an output shaft of the driving member is in driving connection with the speed reducer, and the speed reducer is in driving connection with the rotating shaft.
  9. 9. A vertical roller mill according to claim 8, further comprising a roller mill assembly including a support, a grinding motor and a grinding roller, the support being mounted on the outside of the housing, the grinding motor being mounted on the support, the grinding roller being mounted on an output shaft of the grinding motor and above the grinding disc.
  10. 10. A vertical roller mill according to any one of claims 1-9, characterized in that the width of the powder screen channel decreases gradually from the input end of the powder screen channel to the output end of the powder screen channel.

Description

Vertical roller mill Technical Field The invention relates to the technical field of vertical roller mill equipment, in particular to a vertical roller mill. Background The manganese slag is solid waste in the manganese smelting process, and a large amount of the manganese slag is piled up to occupy a large amount of land resources and possibly pollute the surrounding environment. However, the manganese slag contains rich oxides of silicon, aluminum, magnesium and the like, has certain potential chemical activity, and if the manganese slag is treated as waste simply, the waste of resources is definitely huge, so that the manganese slag comprehensive utilization is developed, and huge economic and environmental benefits are realized. In the related art, the comprehensive utilization mode of the manganese slag mainly comprises the steps of producing cement, bricks, concrete aggregate, roadbed materials, carrying out mine cemented filling and the like by using the manganese slag, and often, carrying out grinding treatment on the manganese slag to convert the manganese slag into fine powder. The vertical roller mill is a device for grinding manganese slag, and the working principle is that raw materials are conveyed into the mill through a feeding component, the mill is driven to rotate along with a rotating shaft, the materials move towards the edge at the center and are extruded downwards by a mill roller, so that crushing and grinding are realized. Subsequently, crushed materials are carried up by hot air at the edge of the millstone, enter a powder selecting machine for sorting, qualified fine powder enters a collecting device for collecting, small particles fall back to the millstone for re-grinding, and part of large particles cannot be carried up by the hot air at the air ring, and enter a grinding system again after passing through a slag outlet. The existing vertical roller mill has some problems and disadvantages as follows: 1. The crushed materials are carried up by hot air at the edge of the grinding disc, enter a powder selecting machine for selecting, and the hot air inevitably carries up a part of small particles. Because the flow speed of the fine powder or small particles carried by the hot air is higher, the components inside the roller mill, such as the outer shell, the grinding roller horn sleeve, the powder concentrator feed back cone and the like, are continuously flushed at high speed. The components inside the roller mill are subject to wear, which can lead to a significant reduction in the service life of the equipment, requiring frequent replacement of damaged components, and increasing maintenance costs. And also generates continuous additional noise. 2. And part of small particles are brought up by hot air, fall back to the millstone for re-grinding after being separated by a powder separator, so that the small particles have more circulation times in a grinding system and consume more energy. 3. Because of the existence of the distance between the grinding rollers, part of unground large particles are thrown out of the grinding disc under the action of the centrifugal force of the grinding disc, the large particles cannot be carried up by hot air at the air ring, and the large particles need to reenter the grinding system after passing through the slag outlet, so that the large particles have more circulation times in the grinding system and consume more energy. Disclosure of Invention The invention mainly aims to provide a vertical roller mill to solve the technical problems in the background technology. To achieve the above object, the present invention provides a vertical roller mill comprising: the vertical roller mill comprises an outer shell, a millstone accommodated in the outer shell, a rotating shaft, a discharging hole, an air inlet, an inner shell, a circulating assembly, a powder sieve assembly and a sorting assembly, wherein the rotating shaft is rotatably arranged on the outer shell; The powder screen assembly comprises a fixed ring and a rotary ring which are positioned below the grinding disc, the fixed ring is arranged on the inner shell, the rotary ring is arranged on a rotating shaft, the axis of the rotary ring is not coincident with the axis of the rotating shaft, a powder screen channel is formed between the fixed ring and the rotary ring, and the input end of the powder screen channel is arranged opposite to the outer edge of the grinding disc; The sorting assembly comprises a sorting disc and a scraping piece, the sorting disc is mounted on the inner shell and provided with a sorting groove, the sorting groove is opposite to the output end of the powder sieve channel, the bottom wall of the sorting groove is provided with a plurality of sorting holes, the inner side wall of the sorting groove is provided with a coarse row hole, the sorting holes penetrate through the sorting disc along the axial direction of the sorting disc, and the scraping piece is mounted