CN1009621B

CN1009621B - Wet vibrating grader

Info

Publication number: CN1009621B
Application number: CN 87106650
Authority: CN
Inventors: 平林利康; 穴用信二
Original assignee: JGC Corp
Current assignee: JGC Corp
Priority date: 1986-09-26
Filing date: 1987-09-24
Publication date: 1990-09-19
Also published as: CN87106650A; JPS6384654A; JPH0557027B2

Abstract

To improve the screening efficiency of the title classifier by arranging >=1-stage fiber-net screen on the upper side of an inclined surface and >=1-state slotted screen on the lower side, and progressively reducing the numerical aperture of the lower screen with respect to the upper screen. On or more-state fiber-net screens 11 and 12 are arranged on the upper side of the inclined surface, and >=1-stage slotted screens 13 and 14 are arranged on the lower side. The diameter of the particles passing through each screen is substantially the same, and the unmerical aperture are progressively reduced from the upper screen toward the lower screen. Namely, the agglomeration of the oversize particles is suppressed by providing a liq. passing velocity matching the velocity at which the undersize fine particles pass through the screen, hence the separation of fine particles is accelerated, the water content in the undersize fine particles is not increased, the particles remaining on the screen are stably discharged, and the classification accuracy and capacity can be improved.

Description

Wet vibrating grader

The present invention about the classification of powder particles such as ore, clay, coal, sort the wet vibrating grader of usefulness.

The damp process vibrating grader is that powder particle is made water slurry basically, supply on the mesh screen of wire netting and so on, when making the mesh screen vibration, corresponding needed water is sprayed at carry out classification on the mesh screen, sort.Like this, prevent the cohesion of the powder on mesh screen, effectiveness of classification is improved, and avoided dispersing of powder particle.

But the such braiding compass screen surface of wire netting is its percent opening height in general, treating capacity is many, and shortcoming is the result that the moisture of water slurry is emitted under the mesh screen in large quantities hastily, and particulate blocks and generates the piece of particle on mesh screen, the particulate of piece inside descends classification efficiency owing to can not separate.Also have, the piece of the particle of generation is stagnated on mesh screen and the effective area of mesh screen is reduced, and the discharge of the remaining particle on the mesh screen also becomes irregular.

For fear of this phenomenon, just need through water is sprayed on mesh screen more, the piece of particle is disperseed, but its result cause the atomic moisture that contains after separating, the i.e. increase of moisture content off the net.

The invention provides a kind of wet vibrating grader, solved above-mentioned such obstacle, the atomic of material matches by mesh screen speed after making liquid by speed and classification, suppress the generation of the piece of the particle on the mesh screen, particulate is separated, do not increase the moisture in the particulate under the mesh screen, remaining on the mesh screen discharged particle-stabilisedly, effectiveness of classification and classifying capability are improved.

The design feature of wet vibrating grader of the present invention is the braiding compass screen surface of upper side configuration more than one section on the inclined plane, at the slotted screen of lower side configuration more than one section, the particle diameter that passes through of the mesh screen of each section comes down to identical, simultaneously, its percent opening is that the mesh screen of hypomere is little than the mesh screen of epimere.Also have, the mesh screen of hypomere is preferably installed and can be adjusted to angle of inclination arbitrarily.

We find at the trial, wire netting braiding compass screen surface from the compass screen surface that general commercially available percent opening is 20-70 suitable be chosen as good.

Slotted screen is to be provided with the moulding hole that casting mold casts out or the non-sieve that is made into of punching hole, be metal, synthetic resin or synthetic rubber system, polyurethane resin system commercial goods for example, foursquare hole, rectangular hole, circular hole etc. have low, the common 6-20% of percent opening.

We also find at the trial, several characteristic and the decisions at random such as classification purpose according to handled particle of the mesh screen of use, braiding compass screen surface and slotted screen each more than one, yet the combination of adopting each 2-3 to open usually.

In addition, the formation of the percent opening of each mesh screen is that the mesh screen of hypomere diminishes in turn than the mesh screen of epimere, also has, and the mesh screen of hypomere is preferably installed and can be adjusted to angle of inclination arbitrarily, particularly big angle of inclination.

Use embodiment (be not be used for limiting of the present invention) to come the present invention is made specific description with reference to the accompanying drawings, wherein:

Fig. 1 is the side view that the formation of wet vibrating grader of the present invention is schematically shown,

Fig. 2 is the plane of Fig. 1,

Fig. 3 is with the wet vibrating grader that has earlier of the wire netting that has earlier and the classification efficiency figure of wet vibrating grader of the present invention.

In illustrated embodiment, the upper side on the inclined plane is disposing the mesh screen 11 that is made into and 12 2 sections, is disposing slotted screen 13 and 14 2 sections in lower side, and the sieve 14 of hypomere installing by hinge 2, can be adjusted to angle of inclination arbitrarily.

Braiding compass screen surface 11 with 12 and slotted screen 13 and 14 are combinations by the identical in fact article of particle diameter.Preferably decide by particle diameter according to the classification order of processing raw material.

Make when identical in fact by particle diameter, when the occasion of the slotted screen of braiding compass screen surface and square hole or circular hole, the aperture is identical.When the occasion of the slotted screen of slot, can hank short there identical as benchmark and aperture.See 12 among Fig. 2,13 and 14.

In use the occasion of the slotted screen in rectangular hole is arranged, the minor face in rectangular hole and powder water slurry stream are harmonious, and promptly long limit is to dispose sidewards.As 13 and 14 layout method among Fig. 2.

In addition, the formation of percent opening of each sieve is that the sieve of the sieve ratio epimere of hypomere reduces in turn.

In the occasion that Fig. 1 and Fig. 2 make up like that, its formation is that the aperture opening ratio of for example braiding compass screen surface 11 of epimere is 60%, and the aperture opening ratio of the braiding compass screen surface 12 of next section is 20%, and the aperture opening ratio of the slotted screen 13 of next section is 10%, and the aperture opening ratio of the slotted screen 14 of hypomere is 6%.

The structure of the sieve of each section and the relativeness of aperture opening ratio are as follows shown in the example of face Fig. 2.

From the flow direction of raw material water slurry, the relative length of the sieve of each section from identical scope to about 2 times, get be decided to be good.

The length of the sieve of particular segment is made more than 2 times of length of the sieve of other sections, still this section further is divided into two sections, make good that percent opening can change.

The angle of inclination (θ 1 of Fig. 1) of sieve can freely be selected, but preferably is set in usually in the 15-20 degree scope.

The sieve of therefore hypomere can be made and unallied arbitrarily big angle of inclination (θ 2 of Fig. 1), the angle of inclination (θ 1) of top sieve section, particularly the angle of inclination can be done greatly again and can be regulated, its reason is that the sieve of terminal section is simultaneously being kept the function as sieve, for remaining object on sieve is discharged (falling) easily, must tilt.

As the means of carrying vibration to sieve, available eccentric drive mechanism input circular vibration.This occasion, amplitude and frequency and so on can both freely be selected.

Also have,, be preferably in sieve and go up configuration spreader nozzle 3 for auxiliary water can be sprayed out by suitable necessary place.

Describe with Fig. 1 and Fig. 2, the stoste that contains powder particle of water slurry shape, supply with continuously on the braiding compass screen surface 11 of percent opening 60% earlier from supply port 4, at this, water in the stoste and an atomic part are sized to come and drop to the below, remaining water and powder particle continue to move on the braiding compass screen surface 12 of percent opening 20%, also have a water and an atomic part to be sized to come at this and fall downwards.

Remaining water and powder particle continue to move on the slotted screen 13 of percent opening 10%, more have a water and an atomic part to be sized to come at this and fall downwards.

The water slurry that the water of remnants on the slotted screen 13 and powder particle form continues to move to the slotted screen 14 of percent opening 6%.

The percent opening of sieve is not the occasion that diminishes in turn, for example, percent opening is under 60% the situation, water from the stoste that supply port 4 supplies come is below almost major part drops to before the arrival here, generate the piece that blocks the particle that forms by particulate on the sieve of hypomere, the particulate of piece inside produces the phenomenon of not falling under the sieve, and such braiding compass screen surface and slotted screen are combined of the present invention, the percent opening of the sieve of the sieve ratio epimere of hypomere is to diminish in turn to constitute like this, water on the sieve of hypomere in the stoste also can arrive, therefore avoided the generation of the piece of particle, particulate also can be sized on the sieve of hypomere.

The moisture that arrives herein is quite few, water slurry flows and becomes difficult, but the slotted screen 14 of hypomere is installed to be adjusted to angle of inclination arbitrarily, by the inclination angle of slotted screen 14 is suitably regulated, water slurry does not flow down on sieve stagnantly, in addition, particulate is sized out when sieve falls down, and the remaining object being treated that moisture has reduced stably is discharged from unchangeably.

Also have, because the variation of proterties of stoste and so on, atomic generation often neither be said impossible, so spray processing with suitable auxiliary water by spreader nozzle 3 in the incidental place of piece.

Embodiment 1

The water slurry of the particle of using the chippy coal of pulverizer, the aperture that only is used as the braiding compass screen surface is 150 μ m * 150 μ m, the wet vibrating grader of the wire netting of percent opening 37% (second: device is arranged earlier), with half of the upper side of same device with identical wire netting, half of lower side aperture 150 μ m * 7mm, wet vibrating grader (the first: apparatus of the present invention) of the slotted screen combination of the polyurethane resin system of percent opening 7%, auxiliary water with necessary amount sprays separately, and the classification efficiency when carrying out classification is shown in Fig. 3.

The longitudinal axis is classification efficiency η among Fig. 3, and transverse axis is load (ton/time/rice ²), promptly, the 3rd figure shows that the part that tails over that falls by original screen cloth is classified into granule and the actual ratio that tails over the classification amount as far as possible (this particle of 1.0-is not done classification, ratio with the last residual volume of sieve), because load, the variation of the water slurry tonnage that promptly per 1 square metre screen cloth is per hour supplied with and situation about changing.Each represents that with f, p, r classification efficiency η is the containing ratio of the particle of holding the following diameter in aperture after raw material, the classification, on the sieve

η＝ (p（f-r）)/(f（p-r）)

When being thought of as the particle after the classification all than the little occasion in aperture, p is 1,

η

(（f-r）)/(f（1-r）)

As shown in Figure 3, the occasion that wire netting (braiding compass screen surface) and slotted screen are used in combination, its classification efficiency (A-wire) classification efficiency (second line) than the occasion of only using wire netting when load becomes big is significantly superior.

Also have, use the occasion of device of the present invention, the necessary auxiliary water yield has also been saved 30-50%.

Effect of the present invention is as follows:

(1) improved classification efficiency.

(2) auxiliary water reduces.

(3) can obtain particulate after the few classification of moisture content.

(4) owing to the raising of classification efficiency, can use required compass screen surface to amass and reduce.

(5) remaining handled thing can stably be discharged unchangeably.

Claims

1, a kind of wet vibrating grader, has the inclination compass screen surface of forming by difference sieve section, the epimere that it is characterized in that tilting compass screen surface is the braiding compass screen surface more than a section, hypomere is the slotted screen face more than a section, the particle diameter that passes through of the sieve of each section comes down to identically, and simultaneously its percent opening is that the sieve of the sieve ratio epimere of hypomere is little.

2, as the wet vibrating grader in the claim 1, the sieve that it is characterized by hypomere is dressed up may be adjusted to angle of inclination arbitrarily.