DE8103450U1 - CHANNEL WHEEL WINDIFIER - Google Patents

Description

- 1 - P 4852

Canal Wheel Wlndslchter

^{The innovation relates to a canal wheel} windsifter with a canal wheel rotatable about a vertical axis, which has classified material feed channels running outward from the center as well as adjacent fine “good” suction ducts leading inwards for the classifying air and as fine material, and with a device provided above the channel wheel for feeding the material to be classified to the center of the channel wheel.

In known channel wheel wind sifters of the type mentioned above, the material to be classified is fed in generally via a central feed pipe that protrudes centrally into the sifter from above and is located extends to the center of the channel wheel. The sighting of such a sewer wheel wind sifter takes place in the main thing in the immediate outer circumference area of the sewer wheel, i.e. in a relatively small viewing zone. With such a sifter, excellent selectivity can be achieved, but this is a prerequisite is that the classified material is fed to the channel wheel particularly evenly.

The innovation is therefore based on the task of developing a sewer wheel wind sifter of the type mentioned in to develop further in such a way that it is characterized by a particularly reliable and even feed of the sighted goods to the sewer wheel.

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This object is achieved according to the invention in that the device for feeding the material to be separated a pneumatic conveyor trough and one that adjoins this conveyor trough centrally via the channel wheel arranged, likewise ventilated, annular overflow space contains.

There are already different turbo windsifter designs known (e.g. DE-AS 11 12 and DE-OS 15 07 726), in which the cut material with With the help of a pneumatic conveyor trough a central viewing area via a spreading plate or a Scatter cone is fed. With these turbo air separators, however, the material to be classified is then over the circumference of the spreader plate or scatter cone is thrown freely into the viewing area, with the visual work then of the rising stream of classifying air is supported by a rotating counter-wing system. Of the The classification process in such a turbo windsifter is completely different from that in the sewer wheel windsifter of the type mentioned at the beginning.

Due to the new design of the sewer wheel wind sifter the material to be separated is loosened up with the help of the pneumatic conveyor chute introduced into the air classifier, before being fed to the center of the canal wheel first in reaches the aforementioned annular overflow space, which is also ventilated (from below). on in this way, a pneumatically loosened and thus increased in volume, extremely even, ring-shaped veil to the center

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of the channel wheel, so that the individual, outwardly running cut material feed channels are very uniform Visible quantities can be given up. The training according to the innovation thus carries in a relatively straightforward manner, both for simplified dosing and extremely even distribution of the material to the material feed channels of the channel wheel at what in turn ensures a consistently constant and particularly good sifter efficiency with a high degree of separation.

This embodiment according to the innovation also contributes this contributes to the fact that the overall height of such a sewer wheel wind sifter is considerable compared to known designs can be reduced.

Further details of the innovation emerge from the subclaims and from the following description some embodiments illustrated in the drawing. Show it

1 shows a largely schematic vertical sectional view through the part of a sewer windsifter that is of interest here;

2 shows a partial plan view of an embodiment a channel wheel;

3 shows a simplified cross-sectional view along the line III-III in Fig.1.

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Of the sewer wheel wind sifter, only the actual wind sifter part with an outer housing is shown in FIG 1 illustrates; however, the overall equipment of a sewer wheel wind sifter also includes at least one fan generating the circulating air flow and one or more external cyclone separators / all of which are not illustrated in more detail in this context, but in the usual way for this Windsifter belong. The pressure side of the fan is provided with a circulating air supply nozzle 2 for Air separator housing 1 connected, while one is arranged within the housing 1 and later Upper suction housing 3 to be explained via outlet nozzle 3a with the cyclone separators (for Separation of fine material) is in connection.

In the interior of the air classifier housing 1, a channel wheel 4 is arranged coaxially to the housing 1, so that this channel wheel 4 can rotate about a vertical axis which coincides with the vertical sifter axis 5. A vertical drive shaft protrudes from above, coaxially to the housing 1 or to the sifter axis 5 6 into the classifier housing 1, with the channel wheel 4 is rotatably mounted on this drive shaft 6. The lower one protruding through the channel wheel 4 downwards The end 6a of the drive shaft 6 can be mounted in a lower bearing 7, which has radial adjustment rods 8 can be centered in a manner known per se. The upper end 6b of the drive shaft 6 is connected to a suitable drive 9 in a manner known per se.

The lower end of the air classifier housing 1 is formed by a coarse material collecting hopper 1a.

This embodiment is of particular importance of the channel wheel wind sifter of the device 10 for the supply of the material to be classified (Arrow 11) to the center 4a of the channel wheel 4. This facility essentially contains one pneumatic conveying trough 12 and an annular overflow space adjoining this conveying trough 13. While the pneumatic conveyor trough 12 is carried out in a conventional manner and from its Bottom 12a can be ventilated forth, is the annular overflow space 13, which connects to the inner end 12b of the conveyor trough, centrally above the channel wheel 4 or arranged above its center 4a. This overflow space 13 also has a ventilated, annular floor 14. This ventilatable overflow space floor 14 and the ventilation floor 12a of the pneumatic conveying chute 12 are - as indicated schematically in the figure "! connected to a common air supply source 15; if desired, can of course separate air supply sources as well as suitable control valves can also be provided.

In Figure 1 it can be seen that between the annular Overflow space 13 and the center 4a of the channel wheel 4, a connecting pipe section 16 is available is. The upper end 16a of this connecting pipe section 16 forms the inner wall of the overflow space 13, whereby it is like an overflow weir

'works. Furthermore, the connecting pipe piece 16 surrounds the drive shaft 6 carrying the channel wheel 4 at a distance, so that the material to be separated (arrows 11) through the thus formed further annular space can be reliably fed to the center 4a of the channel wheel 4.

The outer wall of the annular overflow space 13 is formed by the lower end of a further, essentially cylindrical pipe section 17, which is suspended from the top cover 1b of the case 1; on this piece of pipe 17 is from the outside also the inner end 12b of the pneumatic Conveyor channel 12 brought up.

In general, it will be sufficient if the edge of the upper end 16a of the pipe section 16 and thus the inner wall of the overflow space 13 is smooth, as illustrated in solid lines in FIG is. In some embodiments, however, you can have a further equalization effect for achieve the sight (arrows 11) when the upper edge of the inner wall of the overflow space 13, i.e. in In this case, the upper edge of the upper end 16a of the pipe section 16 is jagged, which is shown in FIG 1 is indicated by dash-dotted lines at 18.

Another possibility for influencing the feeding of the items to be sifted via the overflow space 13 can also be achieved when the height of the top

Edge of the inner wall of the overflow space 13 $

- In this case the upper end 16a of the tube | Piece 16 - relative to the bottom 14 of the overflow rough!

mes 13 can be adjusted / as indicated by the dashed double arrow 19 in FIG. For this purpose, for example, the pipe section 16 forming the inner wall of the overflow space 13 be designed telescopically can be, whereby an adjustment option for the height of the inner overflow wall of the overflow space 13 results.

For the formation of the channel wheel 4 itself, it should be mentioned that this is constructed in the usual way can be, namely - see also Fig. 2 - with from the center 4a outwardly extending cut material feed channels 20 as well as the adjacent air from the external fan (arrows 21) and the fine material (arrows 22) inwardly leading fine material suction channels 23. While the channel wheel is open through the suction channels 23 towards the top in the direction of the upper suction housing 3, points it has a closed base plate 24 at the bottom.

It is assumed that the channel wheel 4 during operation of the air classifier in the direction of the arrow 25 (Fig. 2) is driven, then the following function results:

The material to be separated (arrows 11) is fed via the pneumatic Conveyor trough 12 and the adjoining, ring-SO-shaped overflow space 13 extremely evenly Center 4a of the channel wheel 4 is supplied. By rotating the channel wheel 4 in the direction of the arrow

-δι les 25 will be in the sorting feed channels 20 material that has arrived (arrows 11) is thrown outwards. When leaving these feed channels 20, the material to be classified is captured by the classifying air (arrows 21), which is sucked in from the outside or supplied by the external fan via the feed nozzle 2. While the coarse material (arrow 26) is thrown outwards through the classifying air, the Air (arrows 21) the fine material (arrows 22) and takes it inside into the fine material suction channels 23, from where the fine material is placed exactly above the channel wheel 4 and in its cross section the duct wheel 4 adapted suction housing arrives. From this suction housing 3, the fine material is over the outlet nozzles 3a are fed to the cyclone separators; the separated coarse material (arrows 26) is withdrawn downwards via the coarse material collecting hopper 1a.

Summary:

A sewer wheel wind sifter contains a vertical one Axis (5) rotatable channel wheel (4) as well as a device (10) for feeding the material to be separated (11) to the canal bike center (4a). A particularly even supply of the material to be separated to the channel wheel center is carried out with the help of a pneumatic conveyor trough (12) and one connected to this conveyor trough, centrally above the channel wheel (4), likewise ventilated, annular overflow space (13) achieved.

(Figure 1)
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Claims (8)

Protection claims: 1. Sewer wheel windsifter with a vertical one Axis rotatable channel wheel, which runs from the center ι to the outside of the material feed channels as well as adjacent to this, the sifting air and the fine material inwardly leading fine material suction channels has, and with a device provided above the channel wheel for feeding of the material to be classified to the center of the channel wheel, characterized in that the device (10) for feeding the material to be classified (11) is a pneumatic conveyor trough (12) and an adjoining this conveyor trough, arranged centrally above the channel wheel (4), also contains ventilated, annular overflow space (13). 2. Channel wheel wind sifter according to claim 1, characterized in that between the annular overflow space (13) and the center (4a) of the Channel wheel (4) a connecting pipe section (16) is provided, the upper end of which according to Art one overflow weir forms the inner wall of the overflow space (13) and one forms the channel wheel (4) non-rotatably supporting, vertical drive shaft (6) surrounds at a distance. 3. Channel wheel wind sifter according to claims 1 and 2, characterized in that the outer wall the annular overflow space (13) also is formed by a pipe section (17) which hanging from an upper cover (1b) of the separator housing and attached to the inner end (12a) of the pneumatic conveyor trough (12) is connected. 4. Canal wheel wind sifter according to claim 1 or 2, characterized in that the inner wall (16a) of the overflow space (13) with a smooth Edge is formed. 5. Channel wheel wind sifter according to claim 1 or 2, characterized in that the upper edge of the jagged inner wall (16a) of the overflow space (13) (18) is formed. 6. Channel wheel wind sifter according to one of claims 1, 2, 4 or 5, characterized in that the height of the upper edge of the inner wall (16a) of the overflow weir (13) relative to the Floor (14) of this space (13) is adjustable. 7. Channel wheel wind sifter according to claims 2 and 6, characterized in that the inner one Wall of the overflow space (13) forming pipe section (16) can be extended and retracted telescopically. 8. Channel wheel wind sifter according to claim 1, characterized in that the ventilatable bottom (14) of the overflow space (13) and the aeration base (12a) of the pneumatic conveyor trough (12) a common air supply source (15) are connected.