DD288762A5 - DEVICE FOR SEPARATING COMBINED GOOD - Google Patents

Abstract

During operation, the concentrator plane (3) and the stone extraction plane (4) are made to vibrate. Air is extracted at (19). The air which flows through the concentrator plane (3) fluidises the granular material which is let in through the feed (13) so that it flows off uniformly in an inclined direction. Components with a large specific weight collect on the underside, components with a low specific weight collect on the upper side of the stream. The components with a large specific weight drop down in the drop-through area (7). Components with a low specific weight move towards the light fraction outlet (14). As they drop downwards, the components with a large specific weight are braked by the airstream in the compartments (10), but cannot flow off in the inclined direction because of the transverse webs (11). They are therefore swirled in the compartments before they drop through openings of the second flow mask (9). By means of this swirling, a uniform turbulent airstream through the first flow mask (8) is ensured. As a result, disturbance to the coating of the granular material stream is avoided. In addition, since the uniform charging of the stone separating plane (4) is achieved, the stone separating process is improved. <IMAGE>

Description

For this 2 pages drawings

Field of application of the invention

The invention is used to prepare granular goods for further processing, eg. B. in mills and relates to a device for separation 'in granular material, consisting of a Steinauslesee and a concentrator level, which is located above the Stein & usleseebene and »I divided into a stratification area and a diarrhea area, the diarrhea area with respect to the flow direction of the material flow following the layering region and is arranged in a plane therewith, having a flow mask whose perforation is greater than the particles of the material to be separated and is inclined in the flow direction of the material flow to be separated.

Characteristic of the known state of the art

Grain cleaning has the task of freeing the grain material before the grinding of entrained impurities (impurities, dirt, seeds, eaten grains, etc.). Traditionally, this is done in particular by screening, sifting, stone selection and cell selection. Due to the relatively high mass flow, however, this is not always done to the desired extent or must be driven a very high technical complexity.

In order to simplify this problem, a series of publications has emerged in which so-called concentrators or combinators are described. For example, EPO 162014 discloses a solution in which the cornstock stream is divided into at least two using the so-called fluidized bed. In the respective fractions, depending on the density or the speed of levitation of the constituents, the specific light admixtures (seeds, organic stocking) on the one hand and the specific heavier impurities (stones) on the other hand are concentrated. This means that the specific read-out methods have to be applied with greater effort only in the respective partial product stream. In addition, this method is suitable for combination with the o.g. Tripping methods (eg concentrator / stone extractor or air classifier, or even the triple combination).

Characteristic of this solution is the use of one or two fluidized bed levels. On the upper fluidized bed level, the separation of the grain is always in at least two fractions, on the lower

Wirbelschichtobono or follows the Stolnausloso. The Lolchliraktion (also mixed fraction gonennt) contains the specific lolchtoron Admixtures (e.g., safflower, organic stock). The tail action contains almost exclusively from the Fremdbestendtellen Stones that are read out on the lower vertebral level. In the presence of two fluidized bed ovens ior. .verden

this flows through the same air in succession, so that the required air is used practically doppolt.

The upper whirlwindbone is divided into two functionally different TeIIo: The first part, i. the part from the inlet to otwa to the middle of the plane, is klolner with fine-meshed wire mesh or perforated plate Punched equipped, which is only flowed through by air in the direction from bottom to top and fall through no grain

leaves. Hior forms in the direction of flow the very important for the grain separation separation stratification. In the lower layer of toilets, the good, specifically heavy grain and the stone-tilled Steino pile up. In the upper part of the

Layer inferior, specifically lighter grain and organic Bolmengungon accumulate, e.g. Seeds, chaff

and straw.

The adjoining second part d! Osor Ebeno is equipped with perforated holes, the opening of which are larger, usually one Multiple, as the individual grains of the grain to be separated. This perforated plate does not have the function of a sieve, i. Separate to grain size, but acts as a flow mask. The air flowing through from below should be from the at the Base of grain crops flowing grains only specifically heavier and fail the stones, without the

disrupt the basic structure of the stratification and its movement.

For the effect of this Trennvorgangos it is particularly important that the basic structure of the stratification in spite of the movement

towards the outlet is not disturbed by turbulence (and associated mixing).

On the conservation of the stratification in the upper spin plane act obliquely directed through this flow mask Air currents and different air velocities harmful. By vortex it comes to the mixing of Layer and thus the dor quality of the separation process. The following causes favor the diagnosed disorders; In general, the air passage through the Stoinausleseebene in the area of the stone outlet is greater than on the side of the Grain spout. On the concentrator level above, the air requirement is more likely to be reversed. In the space

between the two layers of fluidized bed, therefore, it comes to balancing the air currents, d. H. The air flows not perpendicular, but obliquely in the direction of inclination through the diarrhea area of the concertator plane. The consequence of this is an excessive acceleration and thus unwanted mixing of the grain layer in this area.

Internals, such. As slides and flaps, under the diarrhea or in the area between two fluidized bed levels

also have a very unfavorable effect on the air flow through the diarrhea area of the concentrator level, as this

Built-in speed minima and maxima of the air and oblique air currents are caused. Object of the invention

The aim of the invention is to eliminate the aforementioned disorders and thereby improve the quality of the separation process.

Explanation of the essence of the invention

The object of the invention is to prevent the mixing of the grain material in the layer flowing above the diarrhea region of the concentrator plane.

The object is achieved in that a second flow mask is disposed below the first flow mask, the open areas are at least equal to or greater than that of the first flow mask and the distance between the flow masks at least the size of the particles of the falling good and transverse webs ( 11) perpendicular to the plane of the flow masks, transverse to the flow direction of the flow and without covering the holes of the upper flow mask, are arranged.

embodiment

The invention will now be explained in more detail with reference to an exemplary embodiment. The corresponding drawings have the following meaning:

1 shows the principle of a machine of the combination concentrator / stone reader (longitudinal section) FIG. 2: shows the design according to the invention of the diarrhea region in longitudinal section FIG. 3: shows the design according to the invention of the diarrhea region in plan view.

Such a machine consists of a swinging suspended and driven by an unbalance motor 1 housing 2, which performs a directed oscillating movement. In this case 2 are firmly connected, but adjustable in their inclination, the concentrator level 3 and below the Steinausleseebena 4 arranged. The stone outlet 5 is located at the upper end of the stone selection level. 4

The concentrator level 3 is subdivided into the stratification area 6, which is covered with a fine vibrating mesh (clear mesh size about 1 mm) and the diarrhea area 7, which has a perforated plate with a hole diameter of preferably 8... 12 mm (for wheat grain ) is fitted as a top plate 8 and a perforated plate with a hole diameter of 9 ... 14 mm as a lower plate 9. The diarrhea region 7 is subdivided into compartments 10 below the upper sieve 8 transversely to the flow of grain material so that the transverse webs 11 abut the ribs 12 of the upper sieve 8 and thus the openings thereof

divide or partially close. The transverse webs 11 can dos after any row of holes or moors hole bores

Obersiebes 8 are arranged. The distance between Oborblech 8 and lower plate 9 should be at least the size of the grains

correspond, but not more than its maximum 10 (Achs measure not überreiton, The transverse webs 11, the holes of Untorblochos 9teilen or partially obscure.

The feed 13 for the grain is arranged at the upper Endo the Konzontrotorobono 3, the light fraction outlet 14 is on

arranged lower end of the diarrhea region 7 of the concentrator 3. The suction hood 15 stretches over the floor of the concentrator buono 15. For better regulation of the gun work, the suction hood 16 is longitudinally in

Chambers 16 oingetollt, dio separate) Luftregullorungon 17 own. In addition, the throttle valve 18 is in air intake 19

arranged to regulate the total air flow.

Inlet 13 and suction hood 15 does not oscillate η in this embodiment and are floxiblos by an air-tight Cloth 20 'connected to the box 2. The execution can also be successful. that the inlet 13 and the suction hood 15 are firmly connected to the housing 2

and resonate. The subdivision of the A isaughaube 15 into several chambers 16 can be omitted in andoron versions, but usually a reduced Arboitseffekt is the result.

Regarding the function of the MV. Due to the oscillating vibration versotzte Stelnausleseebene 4 and Konzentratorobene 3 oin is directed upward Air flow sucked, which is generated by an external fan, not shown here. This is under interposition

a centrifugal separator connected by means of pipe to the air extraction 19.

The grain material passes through the inlet 13 in the machine and passes evenly over the entire width distributed to the Layer region 6 of the concentrator level 3. The air flowing through fluidizes the grain, so that it evenly in Tilt direction of concentrator level 3 f.b flows. This is done by the oscillating Bewogung and the flowing through Air stimulated, a stratification according to the density or floating speed of the components of the grain. Specific

heavy components arrange themselves on the bottom, specifically light components arrange at the top of the

Korngutschicht on. During the movement of this layer fall over the diarrhea area 7 dor concentrator level 3

according to the air flow regulated by the air regulation 17 of the chamber 16, the specific heavy components

through the openings of the upper wire 8 down, while the specific light components in the direction

Move light fraction spout 14. After the specific heavy components have passed through the openings of the upper sheet 8, they are in the respective Compartments 10 braked by the prevailing air flow in their case, but can not due to the transverse webs 11 in Slope direction of the concentrator level 3 drain. There is thus a turbulence of the falling grains

inside the compartments 10 before they pass through the openings of the lower plate e and fall on the stone selection plane 4.

The swirled in the compartments 10 grains and the Quorstege 11 have thereby a very positive effect for a

uniform turbulent air flow through the openings of the upper plate. 8

Obliquely upward-directed air currents can be due to the conditions below the concentrator level 3 so after

no longer continue above and thus no longer lead to a mixing of flowing on the Oborblech 8

Korngutschicht, that is, the principal layering is maintained despite the failure of specific heavy grain. In addition, there is a positive effect on the Steinauslesearbeit in that the inventive design of Diarrhea one very uniform, over JIe entire area of the diarrhea area distributed feed the Steinausleseebene 4 as causes from a large shower. Dio contrasting movements of grain and stones

During the Steinauslesearbeit disturb themselves so much less than the professed solutions. As a result, a higher specific load of the stone selection level 4 is possible and the stone extraction efficiency increases. Installations for steering on the

Stone selection level 4 falling grains in a certain direction or uh üches, as in the known facilities

are common, account for it. ° -

Another positive effect of the solution according to the invention is a better adjustability of the quality of work Concentrator level 3 with the help of Luftreguli'rung 17 of the individual chamber 16. But it can also be dispensed with the subdivision in chamber 16 including the air regulator 17. The regulation

the air then takes place by means of throttle valve 18th

The stone selection level 4 works according to the known principle: While the grains of grain through the air flowing through

fluidly flow in the direction of inclination through the heavy fraction outlet 21, the stones are counteracted by the directional oscillating movement of the stone extraction plane 4, which is covered with fine-meshed vibrating biofilm

Tendency to the stone outlet 5 promoted. Under the adjustable cover plate 22 forms a higher air velocity

out, so that up there carried grain grains are blown towards heavy fraction outlet 21.

Claims (3)

1. Device for separating granular material, consisting of a - Stone exporting life and - a concentrator level, • which is located above the stone extraction level and in - a stratification area and a - Diarrhea area divided, with the diarrhea area Is arranged with respect to the flow direction of the flow of material following the stratification area and in a plane therewith, Having a flow mask, ·· their perforation is larger than the particles of the material to be separated and in • Flow direction of the material flow to be separated is inclined, characterized in that - a second flow mask Is arranged below the first flow mask, ·· their open areas are at least equal to or greater than that of the first flow mask and the - Distance between the flow masks at least the size of the grains of the falling good corresponds and - transverse webs (11) Perpendicular to the plane of the flow masks, • perpendicular to the flow direction of the flow and ·· without covering the holes of the upper flow mask, are arranged. 2. Device for the separation of granular material according to claim 1, characterized in that the distance between the flow masks is at least 2 to 10 times the grain length of the goods to be sorted. A device for separating granular material according to claim 1, characterized in that at least after each row of holes of the upper flow mask and hönnstens at a distance which corresponds to ten times the distance between the two flow masks, a transverse web 11 is arranged.