CN2422068Y

CN2422068Y - Flour screening device

Info

Publication number: CN2422068Y
Application number: CN 00222668
Authority: CN
Inventors: 罗亚军
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-31
Filing date: 2000-03-31
Publication date: 2001-03-07
Anticipated expiration: 2010-03-31

Abstract

The utility model relates to a powder selecting machine, which is suitable for cement production industry. The utility model is characterized in that a lower classification impeller is added based on an original powder selecting machine, a stair counterattack plate is arranged at the outside of a lower material spreading disc, and a small vane and a sealing cover are arranged at a steel ring of an upper classification impeller. The powder selecting machine of the utility model has reasonable structure, and adopts the operation mode of two material spreading, the classifying and selecting operation is carried out twice, and thus, the utility model has the advantages of high precision for classification and high efficiency for powder selecting. Especially, because of the structure of the small vane on the upper classification impeller and the sealing, and the stair counterattack plate in a lower powder selecting chamber, and the powder selecting classification precision and the capability of the material dispersing and crushing can be increased.

Description

A kind of powder concentrator

The utility model relates to a kind of powder concentrator, is applicable to the manufacture of cement industry.

In the grinding process of manufacture of cement, add powder concentrator and form the closed cycle grinding system, improve output and quality, reduce grinding pow consumption, this builds consensus in the sector.Powder concentrator commonly used, section is divided into centrifugal classifier, cyclone type powder sorting machine, eddy current type powder concentrator.Wherein, the eddy current type powder concentrator is with its grinding efficiency height, selects the powder precision accurately to reach size grading and distributes rationally and obtained using widely.China's the enforcement period of the seventh five-year plan, since the Japanese introduction o-sepa of Onoda Cement Co., Ltd powder concentrator, it is superior also to release some classification performances on this basis, the homemade powder concentrator that grinding efficiency is high, and the patent No. of releasing as Hefei cement research institute is the Ds type assembled highly-effective powder concentrator of z19224426; The WXF4825 high-efficient powder concentrator that Nanjing Cement industrial design institute releases; The applicant is the multi-functional powder concentrator of z198229236 in the patent No. of preceding release.The grinding efficiency of these powder concentrators, effectiveness of classification reach the top standard of similar technology.But also there is deficiency in above-mentioned powder concentrator: their grinding efficiency and effectiveness of classification do not reach optimum level yet.

The purpose of this utility model provides a kind of ratio powder concentrator that the grinding efficiency of powder concentrator and effectiveness of classification were all high in the past to remedy the deficiency of prior art.

The purpose of this utility model is achieved in that a kind of powder concentrator, last separating chamber and following separating chamber are arranged in the body, last spreading disk and last classifying turbine are arranged in the last separating chamber, last spreading disk and last classifying turbine drive by the transmission device of body upper, in the separating chamber following spreading disk is being arranged down, it is characterized in that: in the separating chamber following classifying turbine is being arranged down; Following spreading disk is outside equipped with the ladder counterpunch board; The steel ring of last classifying turbine is provided with little fan blade, and little fan blade is positioned at seal closure, and seal closure is fixed on the stationary part.

The powder concentrator that the utility model provides is rational in infrastructure, has adopted twice spreading, and twice classification and sorting makes to the utlity model has effectiveness of classification height, the characteristics that grinding efficiency is high.Especially go up little fan blade on the classifying turbine, seal closure structure and the ladder counterpunch board structure in the separating chamber down, further improved the effectiveness of classification that selects powder and material dispersed, breaking capacity.

Below in conjunction with accompanying drawing, the utility model is further described by embodiment:

Fig. 1 is the system construction drawing of the utility model embodiment;

Fig. 2 is the utility model broken section structure chart;

Fig. 3 is the A-A view of Fig. 2;

Fig. 4 is the structural representation of fan blade and seal closure.

Embodiment:

Elder generation's connected system; Powder concentrator 3, elevator 2, ball mill 1, powder concentrator blower fan 4, deduster 5 and deduster blower fan 6 connect.

In powder concentrator, can be divided into wind path and material road:

Wherein wind path is made up of two transportation work styles: by wind and interior circulated air, interior circulated air is to enter down separating chamber 20 by powder concentrator blower fan 4 pressurization backs by air inlet 26, pass through the centre bore of spreading disk 19 down successively, following classifying turbine 25, centrifugation chamber 16, last separating chamber 14, pass again enter behind the blade of classifying turbine 15 whirlwind tube 23, airduct 8, air outlet 7 turn back to powder concentrator blower fan 4 form in circulated air, just main separation powder wind; By wind is to leak out from a part of wind and system's negative pressure everywhere that ball mill 1 comes out, successively by elevator 2, charging aperture 9, last spreading disk 17 with interior circulated air mixed flow, is shunted through powder concentrator blower fan 4 in last separating chamber 14, and a part of wind that comes out with ball mill 1 mixed flow once more, air inlet 27 by deduster 5 under the suction function of deduster blower fan 6 enters deduster 5, and through purifying the back from air outlet 28, deduster blower fan 6 is discharged in the atmosphere.In this process, wind action is qualified products to be attracted in whirlwind tube 23 and the deduster 5 be collected.

The material road is to enter charging aperture 9 by the material that ball mill 1 grinding is crossed by elevator 2, again by last separating chamber 14, and centrifugation chamber 16, following separating chamber 20, and under wind action, finish the powder process of selecting.

When material enters spreading disk 17 by charging aperture 9, motor 11 rotates spreading disk 17 and last classifying turbine 15 by transmission device 10 jointly, and material is dished out under the action of centrifugal force of last spreading disk 17.The material of shedding out mixes with the air-flow that rises in last separating chamber 14, material the suction of air-flow, centrifugal intertia force, gravity, under the acting in conjunction of cutting force of classifying turbine 15 cutting particle diameters by sorting, the structure of last classifying turbine 15 is for radially to have several rod shape things at circumference, through after the sorting, qualified products pass gap between the rod shape thing with air-flow, enter with the wind in the whirlwind tube 23 and be collected, deliver to next stage equipment from fine powder outlet 22 again.Underproof meal drops to down and is subjected to the revolving force that mechanical axis 24 transmits on the spreading disk 19 and quickens to be shed once more, bump ladder counterpunch board 18, broken up, fragmentation, form uniform endless belt-shaped material curtain: in this process, select the fine powder of carrying secretly in the excess material be subjected to the rising effect of swirling eddy, rise with the wind, and, enter once more in the separating chamber 14 through the preliminary election of classifying turbine 25 down.After falling, meal returns grinding once more in the ball mill 1 through meal outlet 21.

In the utility model, why last classifying turbine 15 is designed to big cone angle dish shape, be because can increase the useful space that goes up separating chamber 14 like this, help selecting for use the whirlpool slurry formula spreading disk that disperses the power that raises up strong, thereby improve grinding efficiency.

In the finished product classification process, to go up classifying turbine 15 and other and do not rotate the material that leaks out between the gap at position in order to reduce, to improve the effectiveness of classification of powder concentrator 3, so the steel ring of last classifying turbine 15 is provided with little fan blade 13, little fan blade 13 is positioned at seal closure 12, and seal closure 12 is fixed on the stationary part.In selecting the powder process, during 15 rotations of last classifying turbine, the air-flow of generation is to effluxing, this just and the air-flow of carrying powder secretly from lower to upper offset, just reached and prevented the purpose of leaking out and expecting.

What deserves to be mentioned is that powder concentrator in the past is not provided with down classifying turbine 25, directly with powder from the gap between following spreading disk 19 and the stator up, this just is unfavorable for improving effectiveness of classification to air intake.The following classifying turbine 25 that the utility model is provided with has just overcome this shortcoming preferably, and this also is the creationary embodiment of the utility model.

Claims

1, a kind of powder concentrator, last separating chamber and following separating chamber are arranged in the body, last spreading disk and last classifying turbine are arranged in the last separating chamber, last spreading disk and last classifying turbine drive by the transmission device of body upper, in the separating chamber following spreading disk is being arranged down, it is characterized in that: in the separating chamber following classifying turbine is being arranged down; Following spreading disk is outside equipped with the ladder counterpunch board: the steel ring of going up classifying turbine is provided with little fan blade, and little fan blade is positioned at seal closure, and seal closure is fixed on the stationary part.