DE1407847A1 - Stream sifter - Google Patents

Description

New version from 10.5-ob

five documents (Art751Ab * 2Nr.lSatz3 of the amendment

description

EU of

Patent application P lh 07 847.8 - Addition see patent 1 21 ^ 073 -

the

ALPINE Aktiengesellschaft concerning

Flow scanners

'' The main patent 1 21 * f 073 describes a flow separator with a revolving classifier wheel, which is controlled by the fluid essentially in closed, approximately radially extending classifying channels from the outside to the inside. > nen is traversed, protected, in which the viewing channels in radial Direction (in the classifying wheel level) are designed in a known journey as zigzag channels without internals. With this sifter the material to be sifted is advantageously fed in from the circumference. After this The main patent can be designed to be rotationally symmetrical around the material to be classified and the flow means to be able to bring it to the circumference of the classifier wheel in equal distribution »

The present invention brings a further approach for the supply of the ßichtgutee and the fluid to the classifier wheel circumference.

During development work on the flow separator, the inventors found that this separator can also be used in certain cases brings considerable results if the material to be viewed and / or the

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Fluid unevenly distributed over the classifier wheel Viewing wheel circumference is supplied.

The invention consists in a flow sifter according to the main patent ait circulating end of the sifting wheel, which is essentially closed by the fluid, in the radial direction (in the classifying wheel plane) viewing channels designed as zigzag-shaped channels without internals aulien is flowed through inwards and in which the classifying material is fed to the classifying wheel at the periphery, the classifying material and / or the fluid is unevenly distributed over the classifying wheel appropriate design of the stationary perimeter of the viewing area.

This flow sifter has a sifter with a feed the material to be viewed and / or the fluid in uniform distribution over the circumference of the classifier wheel has the advantage that its construction is much simpler. This is also the case with a classifier mill that comes with such a classifier is the case. As a result of dispensing with the uniform distribution of the material to be classified and / or the fluid over the circumference of the classifying wheel, other conditions, such as cheapness, good operating properties, etc., can be met far better.

The construction of the flow sifter according to the invention compared to a flow sifter with a good feed in the middle zone of the sifter wheel (see USA patent specification Kr. 2 276 761 and lines 37 to 56 in column k of the main patent) gives excellent results, is based on 3 reasons:

1. If it is fed into the middle zone, about the double number of viewing chambers (only within and

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outside) as with the supply in terms of scope in Classification wheel can be accommodated.

2. Since the material to be classified is necessarily fed to the viewing channels from one side, it is important to ensure that it is evenly distributed the property requires some additional chambers.

3. The amount of air in the inner and outer part of the classifier wheel differ due to the air leakage. Liese amount of leakage air is very high in practically usable constructions and very much dependent on manufacturing accuracy, The mode of operation and the level of wear and tear of the sifter, so that it disrupts the sifting considerably and has not so far by different dimensioning of the inner and outer Viewing wheel part can be compensated.

This leakage problem is explained below with reference to FIG. 1:

In all classifiers with a classifying wheel of the problems occurring in the Fraxis is always that you absolutely avoid Mufi _t daL · passes through the gaps between classifier wheel and stand outsize in daa fine or coarse material.

Since the velocities occurring in a sifter excrete seals, there are only 3 options for passage to prevent dust from leaking air:

1. Find the column so narrow that the continuous fine data is insignificant or got into it *, coarse on the Fineness of the fine material is ground,

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2. Flush the column with clean fluid.

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3. To choose the pressure conditions so that the gaps are flown through to the feed area.

The first measure leads to very expensive and very expensive inspections sensitive Prüzisionsmaachinen with air gaps of only a few Kikron. Therefore, it is used advantageously wherever this catampling is not possible the second measure.

In order to explain the leakage problem, FIG. 1 shows how today's expert would try to build the known sifter with zigzag ßichtrad and medium good task today, with the necessary inventive achievement may remain open.

The working method, as it is known, is only briefly described: i

The classifying air 3 flows through the classifying wheel 1 with the classification levels E ...... O .... e. The goods are fed into the visualization stage O through the cell feeder k. The pressures in the individual trees are shown ochematically by the circled numbers, in % of the pressure consumption of the entire classifier. The gaps 5 and 6 are flushed with clean air 7 so that no feed material is sucked into the fine material outlet pipe 2. The gap 8 is traversed by air 9 with some coarse material from the outside to the inside and must therefore, for reasons of veracity, be fairly Witt.

While the outer stages .A .... E are only drowned by the sifting air 3 through, the inner stages a .... e additionally flow the scavenging air 10 of the column "5, the leakage air IX of the cell sluice k

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and the leakage air 9 of the gap 8.

According to the applicant's experience, with a construction appropriate to the rough operation, the amount of leakage air 9ι 10, 11 with medium fineness is about 20 % and with the finest possible sifting about 100-200% of the amount of air 3.

The disadvantages of these uncontrollable admixtures are evident of the hand, since they do not need to be explained in more detail.

The example with the previously known average good feed in FIG. 1 shows, for example, 11 levels E .... O .... e. The middle level 0 does not carry out a sifting, but only serves to suspend the goods in the 'sifting air. Likewise, the next stages a, A are not very effective because of the asymmetrical loading. Even if this is neglected, the five steps a -. C ₅ stand for the fine inspection. e available.

A Sickeack classifying wheel with an external task therefore requires the same level of cleanliness of the fine tea instead of the 11 viewing levels previously known Classification wheel only a total of 5 slope levels.

This means that compared to the previously known classifier wheel in the classifier wheel of the erfindungsgeaMfctn sifter with the same outer diameter for the individual levels of = r ■ 2.2 times the space available 1st. (Even at • In consideration of the larger Abeaugrohres is still the double places sur available) · For even distribution of the Äichtgood · the axial · length of the individual steps (chambers) must not exceed a certain multiple of the radial extension (according to the invention, the value 1.6 is particularly advantageous), is therefore for

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the critical with respect to the innermost Durchflufcquerschnitt step e when erfindungsgemaCen faces the double Curchflußquerechnitt as present in the prior art separator material feed medium. The classifier according to the invention thus achieves twice the throughput with the same diameter, which is a significant advantage. In addition, the smaller number of stages has other advantages, such as easier production and lower sensitivity to buildup and wear.

The flow separator according to the invention works with any flow medium, in particular air and water.

It has been shown that despite the uneven loading of the The cleanliness of the fine goods is not noticeably worse around the sight wheel circumference will. The reason is probably that the periodic fluctuation in the amount of material and air, which each viewing channel experiences during a cycle, is only noticeable as an oscillation superimposed on the steady flow, the opposite of the great turbulence that is already present the sighting in the individual viewing chamber is not significantly spoiled » tert.

In the case of a visible item that is very easy to separate, i.e. one that is not sticky and well-flowing material, it may be sufficient, as shown in Figure 2 the classifying material simply the classifying wheel circumference at a single point on easiest to feed a downpipe at the top durob. The fine material is then sucked inwards by the classifier wheel, while the coarse material is sucked inwards is thrown out again for a shorter or longer time and then somehow caught. The fluid becomes part of the Siohtraduafang through the downpipe with a view good, partly out of the uaeohließenden coarse material housing.

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The supply according to the invention of the material to be classified and / or the flow means in unequal distribution over the circumference of the classifier wheel be particularly advantageous if the classifier is equipped with a beater mill is combined to a classifier mill.

The development has shown that for the efficiency of a classifier mill, i.e. for the throughput at a certain fineness, it is crucially important that the grist is offered to the balance wheel by the beater mechanism of the mill after every beat - or at least after as few beats as possible as often as possible until all of the produced fine material has been removed. The fine material content in the bald area should therefore be as low as possible. This measure can, of course, only be carried out if the classifier wheel, like that of the flow classifier according to the invention, does not react unfavorably to the then generally much coarser feed material of the classifier. The well-known to verifiable and widespread arrangement according to FIG 7 of the main patent does not satisfy the above condition "Although the high selectivity and absolute coarse grain freedom dee erfindungagemäßen classifying wheel also brings an advantage in terms of di" goodness dee product over the known view wheels, but in custody of Classification wheel from possible reduction of the fines content in the grinding chamber and the associated increase in the efficiency of grinding cannot be achieved in this way.

The permanent coupling of the classifier and grinder also has the disadvantage that the speed of the beater does not have to be adjusted according to the grinding problem, but rather according to the vision problem, so that it will often be next to the optimum of the grinding. ,

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The advantageous arrangement illustrated in FIGS. 3 and k was developed from these findings.

The Siohtrad is arranged with a horizontal axis parallel above the hammer mechanism, which is also designed with a horizontal axis and the length of which is approximately equal to its diameter, whereby both runners have the same direction of rotation £ the two end walls of the viewing room - the room in which the viewing wheel runs - ^ approach atark upwards and the conical shape shown in Figure K is created. Between the classifier wheel housing and the classifier wheel there are passages on both sides for feeding the material thrown up by the hammer mechanism in an uneven distribution over the classifier wheel circumference.

This arrangement results in several advantages, which overall mean a significant improvement over known classifier rings:

The racket mechanism, which is supported on two sides, is the most robust form the Schlagermühle.

The working area of the classifier mill does not contain any narrow channels Büe tend to build up.

By narrowing the visible roughness upwards, everything is ground Well supplied to the sight wheel circumference.

Xa Kahlrawa there are no dead lines, "ns which the fine material will not denoau, because the feed material as well as the? Oi sifter" urUokgewieeene coarse material are in the middle of the hammer mill " eu led, goes «by displacement to the end of the racket and are thrown down there to the sifter

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The speeds of the grinder and siohter can be set independently of each other to the best value in each case.

The classifying air is completely used for the very important cooling of the grinding zone.

A further improvement of the presentation of the sighting goods to the sighting wheel circumference can be achieved by approaching the sighting space circumference fairly close to the sighting wheel and attaching fuming blades that are inclined there (see Figure 5) so that they move the goods towards the sighting wheel support financially. Of the many forms examined, this execution was the most favorable; Their effect is likely to be based on the fact that the classifying material is ^{driven together by the Räumechaufein to form a "strand 11} at the sighting chamberuafang, which is so narrow and high that the displacement effect brings the classifying material away from the perimeter of the classifying space against the centrifugal force to the classifying wheel.

The equality of the circumferential speeds of the Qut and the classifying wheel achieved by the Räuaschaufeln contributes to the improvement of the sifting.

Shielding between the classifier wheel and grinder prevents wear and tear on the classifier wheel ßichtgutes increased from about Y2 to 3 / ^ visibility range and is also the idle power requirement of the cool is reduced by the dea Mahlraua upwards into the Sichtraua escaping air flow is reduced, who consumes acceleration power on his return to the ceiling *

The inventive sighting wheel shows another interesting side issue.

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tion: During operation, it strongly attenuates the airborne noise passing through here, probably as a result of absorption by the leakage in the canals.

In the case of a classifier mill equipped with such a classifying wheel, it is sufficient therefore a silencer for the sucked in to reduce the air foam pure air, while an exhaust silencer, which because of the The fine materials contained in the exhaust air represent major constructional difficulties would be superfluous.

The disadvantages of having difficult Hichtprobleraen by giving up Circumference of the classifying wheel - i.e. by dispensing with a Kachaichtung of the coarse material in the classifying wheel - with regard to the cleanliness of the coarse material, can also arise through appropriate mailing in the design of the jacket of the housing enclosing the gear wheel has been eliminated «ground« the sense of these measures ("means for increasing the dwell time") consists of repeatedly offering the coarse material to the circumference of the classifier until the classifier wheel has the particles below the separation limit has pulled out so far, dafc, the desired degree of cleanliness dec Orobgutee is reached.

Various means for extending the dwell time dee on the inner surface of the Hichtradgehiiuseo circling coarse material, such as a blade ring with movement "dee good in · circumferential direction (DBP 8 ^ 5 Ikk, DBP 83 ^ Qt * 2 _t US Pat. 2 963 230} are available to the expert. confesses.

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Also the "floating ring cloud" mentioned in the main patent is made of, DP, -

Registration A 31 518 II1 / 5Od known to eich.

It is necessary to use the means described above for

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To extend the dwell time, select the one setting. allow the delay time. Such means are mentioned, for example, in the DBF 83 ⁴ J- QhZ .

There, however, a purpose is mentioned that is not of interest here j the setting of the dwell time is supposed to be based on a change change the separation limit of the braking effect. When inventive On the other hand, the setting of the dwell time brings a different sifter Advantage: Depending on the desired level of cleanliness, for every visible problem of the coarse material either a long dwell time with a small feed quantity or short dwell times can be set for high feed quantities. Up to now, the residence time for a certain classifier was a certain one Separation limit fixed by the type of construction; through the adjustability of the dwell time So the working range of a classifier equipped with it is increased significantly.

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Claims (1)

XA - New documents ^ ". / 10, S, U07847 Patent claims 1. Flow sifter with revolving sifting wheel, which is from the flow agent essentially in closed, in the radial direction (in the classifying wheel plane) all zigzag channels without internals designed viewing channels are traversed by auten inwards and in which the items to be classified are fed to the classifying wheel at the periphery, according to patent 1 21 ^ 073 »characterized in that that. the feeding of the material to be sifted and / or the fluid in uneven distribution over the circumference of the classifier wheel by expedient Design of the stationary classifier wheel housing takes place. 2. Flow calmer according to Anepruc'h 1 with a around a horizontal Axis revolving classifier wheel, in particular for the sifting of easily separable material, characterized by a downpipe (15) arranged in the classifier housing (13) for feeding of the material to be classified (16) in an uneven distribution over the circumference of the classifying wheel. 3 » Flow classifier according to claim 1 with a classifier wheel arranged above a hammer mechanism, characterized in that the hammer mechanism (20) and classifier wheel (27) have a horizontal axis and rotate in the same direction that the length of the hammer mechanism is approximately equal to its diameter and that both sides between the Classifying wheel housing (24) and the classifying wheel (27) passages for feeding the material (kO) thrown upwards by the beater mechanism - after one or more revolutions in the grinding chamber (26) - unevenly distributed over the classifying wheel ^Mfane "! * ·" *: ", ^6ind '9 09 8 0 7/0105 ^W ° ^mmAL nterjagen (Art. 7, Section 1, Paragraph 2, No. 1 Sat3 dos; v, ..; ,,>, - ^. v. September 4, 1967) _ - _ IA - 9 ^ 38 U07847 H. Flow separator according to claims 1 to 3, characterized by means known per se, such as casing parts of the classifier wheel housing (13), shielding (* f2) between classifier wheel (27) and hammer mechanism (20), which are not accepted by the classifier wheel after the first task or present the centrifuged material repeatedly to the circumference of the classifier. 5. Flow sifter according to claim 3 and k, characterized by a distance (46) between the classifier wheel (27) and jacket of the classifier wheel housing (24) approximately equal to the entrance width of the classifier wheel and by inclined scraper blades (4l) on both sides of the classifier wheel to support the supply of the hochge - * hurled good things at the viewing wheel wall. 6. Flow separator according to one or more of claims 1 to 5 » characterized by means known per se for setting the dwell time dee on the inner wall of the classifier wheel housing circling coarse material, such as a height-adjustable blade ring with movement of the material in the circumferential direction or in a helical shape, height-adjustable obstacles and the like. 90980 7/01 OS bad