CN101850286A

CN101850286A - Vertical roller mill with internal screening device

Info

Publication number: CN101850286A
Application number: CN200910132992A
Authority: CN
Inventors: 王华业
Original assignee: 王华业
Priority date: 2009-04-01
Filing date: 2009-04-01
Publication date: 2010-10-06

Abstract

The invention relates to a vertical roller mill with an internal screening device. An internal screening grading device is arranged on the periphery of an internal millstone of the vertical roller mill. Materials are added from the upper material inlet of the vertical roller mill and enter the millstone. Under the effect of roll-in, the materials are ground into powder material which reaches an air swept ring via the internal screening grading device and is lifted to an upper separator under the effect of high-speed airflow at the point of the air swept ring, and the ground rough materials and large particles not ground are left in the millstone to be ground continuously under the control of the internal screening grading device. Because the amount of material fine powder reaching the air swept ring is increased, the lifting air speed and air pressure of the materials are greatly reduced, the power consumption of powder selection of the separator is reduced, and the powder selection efficiency is increased. Because the air speed and the air pressure for lifting the materials are reduced, the specification of matched motors and fans are reduced, and the power-saving capability of the whole grinding system is improved.

Description

A kind of band inner sieving mechanism vertical roll grinder

Technical field:

The present invention relates to a kind of vertical roll grinder, the vertical roll grinder of sieve classification device is applicable to building materials, chemical industry, metallurgy industry, brittle materials such as grinding lime, coal, clinker, slag in especially inner the setting.

Background technology:

At present, known vertical roll grinder operation principle is as follows: material adds from vertical roll grinder top charging aperture, enters mill.Under rolling effect, material is by grinding, and moves to the dish periphery.Cross collet and fall into vane, taken up by the high velocity air of 80-90m/s, the bulky grain that weight is bigger is fallen back to the mill granule is brought into separator by air-flow, carries out sorting.Qualified finished product is taken machine out of with air-flow and is collected outward as product, and coarse fodder returns mill grinding more again.Material is before becoming product, need repeatedly grinding and sorting repeatedly on mill, because it is high wind speed that wind is swept the ring place, its pressure loss reaches more than the 5000Pa, the repeatedly grinding sorting circulation repeatedly of material simultaneously, increase wind greatly and swept the material concentration of ring top, not only increased its resistance, lowered the separative efficiency of separator simultaneously.In order to compensate a large amount of pressure losses of vertical roll grinder inside, the blower pressure of system support is more than 10000Pa, and ton power accounts for 40% of grinding system power consumption more than 8kW, formed the high reason place of grinding system power consumption.

Summary of the invention:

The present invention seeks to a large amount of pressure losses at above-mentioned vertical roll grinder inside, the system power consumption is high and propose, and provides a kind of band interior sieve classification vertical roll grinder.As interior sieve classification vertical roll grinder, sieve classification device in the mill periphery is provided with, control wind is swept the material fineness at ring place.It is thinner to make wind sweep the material fineness at ring place, sweeps wind speed and the blast that the ring place promotes material thereby reduce wind, reduces material concentration in the mill simultaneously, improves separative efficiency, and blower fan, the rating of electric machine that reduction system is supporting reduce the grinding system power consumption.

Above-mentioned purpose of the present invention realizes by following measures:

Sieve classification device in set up vertical roll grinder inside.During grinding, material enters from the top charging aperture of vertical roll grinder, arrives the mill center, and under action of centrifugal force, material moves to the mill periphery.Under the abrasive action of the roller pressure of Burnisher apparatus and shearing force, the part grinding becomes fine powder material, arrive wind by interior sieve classification device and sweep ring, under the effect of high velocity air, rise to the top separator, another part then under the effect at interior sieve classification, is not still stayed mill relaying continued powder mill by grinding and the bulky grain through pulverizing.Because it is thinner that arrival wind is swept the material fineness of ring, thereby reduce the wind speed and the pressure that promote material, reduce the material concentration in the mill simultaneously, improve separative efficiency, the loss of vertical roll grinder pressure inside is reduced more than 35%, and whole grinding system economize on electricity reaches more than 20%.

The invention has the beneficial effects as follows: the setting up of the inner screening of vertical roll grinder grading plant, material enter wind to sweep the material at ring place thinner.Maximum particle size can be controlled in below the 5mm, and the content of finished product improves more than 30% in the material simultaneously, and the wind speed that makes wind sweep the ring place like this can be reduced to below the 50m/s, and wind is swept ring place crushing and descended more than 30%, reduces the material concentration of bottom body.Vertical roll grinder pressure inside loss reduces and reaches more than 30%, dwindles with supporting blower fan, the rating of electric machine, and power consumption descends, and the saving power consumption of whole grinding system reaches more than 20%.

Description of drawings:

The sectional structural map of Fig. 1 embodiment of the present invention

Fig. 2 is sequence number 4 detail drawings among Fig. 1

Symbol description:

Fig. 1: sieve classification device 5 gas deflector cones 6 wind are swept ring 7 mills 8 reductors 9 motor 10 master cylinders 11 Burnisher apparatus in 1 discharging opening, 2 separators, 3 charging apertures 4

The specific embodiment:

In Fig. 1, motor (9) drives reductor (8) rotation, and mill (7) is placed on reductor (8) flange, rotates with reductor (8).Material adds from charging aperture (3), falls mill (7) center.Under action of centrifugal force, material moves to the mill circumferential edge.Burnisher apparatus (11) material under pair roller under the effect of master cylinder (10) carries out grinding.It is mobile that material behind the grinding is gone up in periphery sieve classification device (4) at mill (7).[Fig. 2 is the detail drawing of interior sieve classification device (4), in the sieve classification device, is divided into fixedly grate plate, activity grate plate, in that fixedly circle or Long Circle comb hole are offered in grate plate, activity grate plate top, in the retainer ring bottom, loose collar top is provided with minor groove, forms crusher chamber.] arrive in the material of sieve classification device (4), the part fines is swept ring (6) by sieve classification device arrival wind and is located, sweep at wind under the acting in conjunction of the high velocity air of ring (6) and gas deflector cone (5), fines is promoted to top separator (2), qualified product is by separator (2), discharge from discharging opening (1) with air-flow, collect by outside dust-precipitator.Underproof material falls back on the mill (7).A part without the roll-in grinding and through the bulky grain behind the grinding then under the effect of interior sieve classification device (4), still stay mill (7) and go up and continue by grinding.

Through test, arrive wind by the sieve classification device and sweep the material at ring place, maximum particle diameter is below 5mm, and what 1mm was following accounts for 72%, and the following material of 0.08mm accounts for more than 40% simultaneously.Like this, for adopting sieve classification vertical roll grinder in the band, the wind speed that wind is swept the lifting material at ring place is reduced to below the 50m/s.And that wind is swept the pressure loss of ring is proportional with wind speed, and the wind pressure loss of sweeping ring reduces more than 30% like this.Improve finished product content in the material, reduce the internal circulating load of vertical roll grinder materials inside, also reduced simultaneously in the mill and selected powder concentration, effectively reduce the power consumption of separator, improve from the separative efficiency of separator.Dwindle supporting blower fan, the rating of electric machine, whole grinding system economize on electricity reaches more than 20%.

Claims

1. the interior sieve classification device vertical roll grinder of band is characterized in that: sieve classification device in set up vertical roll grinder inside.

2. sieve classification device in according to claim 1, it is characterized in that: interior sieve classification device is arranged on the interior neighboring of mill.

3. according to claims 1 described interior sieve classification device, it is characterized in that: the fixedly comb ring of interior sieve classification device, the movable ring of combing are established circle or Long Circle comb hole, and fixing comb ring and movable the comb are established groove between the ring, the formation crusher chamber.