EP0349710B1 - Dewatering scoop wheel for sand dressing plants - Google Patents

Dewatering scoop wheel for sand dressing plants Download PDF

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Publication number
EP0349710B1
EP0349710B1 EP89105330A EP89105330A EP0349710B1 EP 0349710 B1 EP0349710 B1 EP 0349710B1 EP 89105330 A EP89105330 A EP 89105330A EP 89105330 A EP89105330 A EP 89105330A EP 0349710 B1 EP0349710 B1 EP 0349710B1
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EP
European Patent Office
Prior art keywords
bucket wheel
water
chamber
buckets
trough
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EP89105330A
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German (de)
French (fr)
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EP0349710A3 (en
EP0349710A2 (en
Inventor
Fritz Stichweh
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FRITZ STICHWEH GmbH
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FRITZ STICHWEH GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/56—Drum classifiers

Definitions

  • the invention relates to a dewatering scoop wheel, which is rotatably mounted in a trough, for systems for sand preparation, in which the cups arranged on the circumference of the scoop wheel pass through the trough loaded with the sand / water mixture, in which the bottoms of the cups act as slotted screens for the Drainage of the water entrained from the tub are formed, and in which, at the bottom of each cup, there is a chamber defined by sheets running perpendicular to the side walls of the scoop wheel, which extends towards the wheel interior and is open at its end facing the wheel interior .
  • the extracted material is usually first fed to a sieving machine, which sorts the material by size, and then the sieved fine-grained material is fed to a bucket wheel arrangement, in which the material is washed and then separated from the water.
  • the mixture of sand and water is introduced into a trough in which a bucket wheel with cups arranged on its circumference slowly rotates, the cups continuously absorbing the water-sand mixture.
  • the entrained water when the cups leave the tub, can flow back into the tub.
  • the beakers then release the sand, which is largely freed of water, to a conveyor line.
  • a gravel drainage device is known with a scoop dipping into a scoop with scoops distributed over the circumference, in which a chamber defined by sheets extending perpendicularly to the side walls of the scoop wheel adjoins the bottom of each cup, which extends towards the inside of the wheel and is open at its end facing the inside of the wheel.
  • the sheets only have the function of water drainage plates which have legs bent at their lower ends in such a way that the water can be drained off to one side and exits through cutouts in the side wall of the scoop wheel without returning to the tub.
  • the invention has for its object to provide a dewatering bucket of the type mentioned, with which disruptive components during the dewatering of the sand can be easily removed.
  • the chambers are formed by spiral, completely delimited by the side walls of the scoop wheel, one end of which is attached to the inside of the scoop wheel side of the associated bottom and the other end on one predetermined radius of the scoop wheel ends that a plurality of injector devices are arranged in the trough below the water level so that a medium can be injected with them into the open ends of the chambers passing them in the direction of the bottoms of the cups assigned to the chambers, and that the Injection into a chamber is interrupted as soon as the surface of the emerging cup belonging to the chamber reaches a predetermined height above the water level, while at least the subsequent chamber, preferably the three subsequent chambers, remain pressurized with the medium that the injection is so severe eating is that an upflow occurs in the affected beakers and that means are provided for laterally removing the surface water formed by the upflow in the beakers with impurities floating therein.
  • the means for removing the surface water contain a second plate bridging the fastening point of the plate on the bottom of the cup, which connects with the side walls of the scoop wheel, the end region of the first plate pointing towards its interior, and one at the fastening point of the first
  • the adjacent sieve area forms a second chamber, smaller than the first chamber, which is provided with a lateral drain.
  • the area of the sieve which adjoins the attachment point of the first sheet and opens into the second chamber is provided with a larger sieve gap width than the area of the sieve which opens into the first chamber. In this way, the surface water with the contaminants can quickly flow into the second chamber.
  • At least one overflow channel in the tub with an outflow leading to the outside, which is arranged to be height-adjustable or pivotable. This makes it possible to influence the amount of fine sand to be separated out.
  • Water is preferably used as the injected medium. However, air can be used instead.
  • the ends of the outwardly facing sides of the bottoms 6 end in a cutting edge 9, by which the absorption of the sand from the tub 1 is facilitated.
  • a solid sheet 17 is attached, the end of which is connected to the cutting edge 9 of the cup following in the circumferential direction.
  • a sheet 10 is attached to the inwardly facing side of the shelves 6.
  • the sheets 10 run spirally towards the inside of the scoop wheel and all end on the same radius 11 of the scoop wheel.
  • the plates 10 form with the side boundary walls 12 under each of the floors 6 a chamber 13 which is open at its inner end.
  • the bottoms 6 are designed in a known manner as slotted screens, the areas of the bottoms which extend from the cutting edge 9 to the fastening point 14 of the sheets 10 have a gap width which allows the water which has been carried along to flow away easily from the cups 3 while the gap width of the area 16 of the bottoms from the attachment point 14 to its connection to the sheet 17 is substantially larger than in the area opening into the chambers 13.
  • the area 16 provided with the larger gap width opens into a small chamber 18, which is formed by a sheet 19 bridging the attachment point 14, the boundary walls 12 of the scoop wheel 2, the area 16 of the bottom 6 and the upper end of the sheet 10.
  • the small chambers 18 are each provided with a drain 20 which opens into a channel, not shown, outside the boundary walls 12 of the scoop wheel 2.
  • the supply pipes are connected to a water supply via controllable valves 23.
  • the valves allow the amount and pressure of the water injected from the nozzles 21 into the chambers 13 to be adjusted. In any case, the setting is carried out in such a way that the injected water reaches the cups 3 and, as a result, an upflow is generated in them, through which contaminants, which are lighter than the sand, float.
  • the nozzle arrangement is carried out in such a way that the upflow is generated in the cups which stand before emerging from the water level 7, the injection into a chamber 13 being interrupted as soon as the surface of the cup belonging to this chamber is a predetermined height above the water level 7 reached.
  • the surface water with the floating undesirable constituents such as wood, coal etc. can, after emerging, flow through the screen area 16 with the large gap width into the associated small chamber 18 and be discharged from there via the side drain 20.
  • a stationary nozzle arrangement 24, fed with water or air, which is directed laterally onto the surface of the cup that appears in each case, can assist the flow into the chamber 18.
  • a sieve width of approximately 6 mm in the region 16 of the trays 6 has proven to be suitable, while the sieve width in the remaining region of the trays is approximately 1 mm.
  • the number of the chambers 13 acted upon by the nozzles 21 depends on the respective circumstances and can be selected and adapted accordingly by means of the valves 23.
  • the level of the water level can be kept constant by a simple overflow, but control devices can also be provided which control the valves 23 or pumps.
  • an overflow is provided in the form of two overflow channels 25 which are located opposite one another Sides are arranged inside the tub 1, and from which a drain pipe 26 leads to the outside.
  • the troughs 25 are mounted adjustable in height.
  • the overflow channels 25 are each pivotably mounted about a horizontal axis 27 extending perpendicularly to their longitudinal extent, which is also the axis of the drain connector 26.
  • the pivot axis 27 with the drain port 26 is arranged near one end of the overflow channel. In the normal position, the upper edges of the overflow channels run horizontally. In this position the water level is at its highest and the water overflows along the entire length of the overflow channels. In this case, little fine sand is excreted.
  • the overflow channels are lowered by swiveling about their axes 27 at the end opposite the discharge nozzle. This lowers the water level.
  • the water overflow no longer takes place along the entire length of the channels, but only on a section. In this area the flow velocity of the water is correspondingly higher, so that more fine sand is separated out.
  • the pivoting movement should be synchronized.
  • the means for executing the pivoting movement can be of any design.
  • the free end of the overflow channels 25 can be lowered and raised mechanically, hydraulically or pneumatically.
  • a simple solution is indicated in Fig. 1.
  • a spindle 28 is rotatably mounted, which is adjustable in its axial direction by means of a handwheel 29, which is supported on a stationary plate 30, preferably connected to the tub 1, and thereby the overflow channel 25 about the axis 27 pivots.
  • the medium supplied to the nozzles 21 is preferably water, but instead it would also be possible to effect the desired upward flow of the undesired constituents of the sand by air.

Abstract

The invention relates to a dewatering scoop wheel for sand dressing plants, in which the buckets (3) arranged along the circumference of the scoop wheel (2) run through a trough (1) filled with the sand-water mixture, and in which the floors (6) of the buckets (3) are constructed as bar sieves for the running off of the water carried away from the trough. The invention provides that a chamber (13) connects to the floor (6) of each bucket, said chamber extending in the direction of the inside of the wheel and being open at its free end, that a plurality of injector devices (21) are arranged fixedly in the trough (1) below the water level (1) in such a way that with these a medium can be injected into the open ends of the chambers (13) running past them, in the direction of the floors (6) of the buckets (3) assigned to the chambers (13) and only those chambers can be fed with the medium whose assigned buckets are not yet below the water level (7) or are just emerging from the water level, the injection being dimensioned to be of such a strength that in the buckets (3) affected an up-current arises, and that means are provided to lead away laterally the surface water, with impurities washed into it, formed by the up-current in the buckets, before said surface water can flow through the floors into the chambers. <IMAGE>

Description

Die Erfindung betrifft ein Entwässerungs-Schöpfrad, das drehbar in einer Wanne gelagert ist, für Anlagen zur Sandaufbereitung, bei dem die am Umfang des Schöpfrades angeordneten Becher die mit dem Sand-Wassergemisch beschickte Wanne durchlaufen, bei dem die Böden der Becher als Spaltsiebe für den Ablauf des aus der Wanne mitgenommenen Wassers ausgebildet sind, und bei dem sich an den Boden jedes Bechers eine durch senkrecht zu den Seitenwänden des Schöpfrades verlaufende Bleche definierte Kammer anschließt, die sich in Richtung auf das Radinnere erstreckt und an ihrem zum Radinneren weisenden Ende offen ist.The invention relates to a dewatering scoop wheel, which is rotatably mounted in a trough, for systems for sand preparation, in which the cups arranged on the circumference of the scoop wheel pass through the trough loaded with the sand / water mixture, in which the bottoms of the cups act as slotted screens for the Drainage of the water entrained from the tub are formed, and in which, at the bottom of each cup, there is a chamber defined by sheets running perpendicular to the side walls of the scoop wheel, which extends towards the wheel interior and is open at its end facing the wheel interior .

Bei der Aufbereitung von Sand und Kies wird das geförderte Material in der Regel zunächst einer Siebmaschine zugeführt, die das Material nach Größen sortiert, und anschließend wird das ausgesiebte feinkörnigere Material einer Schöpfradanordnung zugeführt, in der das Material gewaschen und anschließend von dem Wasser getrennt wird. Das Gemisch aus Sand und Wasser wird dabei in eine Wanne eingeleitet, in der ein Schöpfrad mit an seinem Umfang angeordneten Bechern langsam rotiert, wobei die Becher kontinuierlich das Wasser-Sandgemisch aufnehmen. Durch die als Spaltsiebe ausgebildeten Böden der Becher kann das mitgenommene Wasser, wenn die Becher die Wanne verlassen, in die Wanne zurückfließen. Nach etwa einer halben Umdrehung des Schöpfrades nach Auftauchen der Becher aus dem Wassorspiegel in der Wanne geben die Becher dann jeweils den vom Wasser weitgehend befreiten Sand an eine Förderstrecke ab.In the processing of sand and gravel, the extracted material is usually first fed to a sieving machine, which sorts the material by size, and then the sieved fine-grained material is fed to a bucket wheel arrangement, in which the material is washed and then separated from the water. The mixture of sand and water is introduced into a trough in which a bucket wheel with cups arranged on its circumference slowly rotates, the cups continuously absorbing the water-sand mixture. Through the bottoms of the cups, which are designed as slotted screens, the entrained water, when the cups leave the tub, can flow back into the tub. After about half a turn of the bucket wheel after the cup has emerged from the water level in the tub the beakers then release the sand, which is largely freed of water, to a conveyor line.

Die Kies- und Sandvorkommen, die keinerlei Verunreinigungen enthalten, sind inzwischen weitgehend abgebaut worden, so daß in zunehmendem Maß auch solche Vorkommen ausgebeutet werden müssen, in denen Holz, Kohle und andere unerwünschte Bestandteile enthalten sind. Diese Bestandteile müssen aus dem Material entfernt werden, weil sie andernfalls bei der Verwertung des Sandes in Beton störende Einschlüsse bilden, die zum Teil sichtbar sind. Während die Entfernung der Verunreinigungen bei grobkörnigem Material bereits bei der Aussiebung geschieht, muß die Beseitigung aus feinkörnigem Material beim Wasch- bzw. Entwässerungsvorgang erfolgen. Die bisher bekannten, zur Entwässerung verwendeten Schöpfräder erfüllen diese Anforderung nur unzureichend oder gar nicht.The gravel and sand deposits, which do not contain any impurities, have now largely been mined, so that to an increasing extent those deposits must also be exploited which contain wood, coal and other undesirable constituents. These components have to be removed from the material, because otherwise they form disturbing inclusions during the recycling of the sand in concrete, some of which are visible. Whilst the removal of the impurities in the case of coarse-grained material already takes place during the screening, the removal from fine-grained material must take place in the washing or dewatering process. The previously known scooping wheels used for drainage meet this requirement only inadequately or not at all.

Aus der DE-B-12 08 261 ist eine Kiesentwässerungsvorrichtung mit einem in eine Schöpfwanne eintauchenden Schöpfrad mit auf dem Umfang verteilten Schöpfbechern bekannt, bei dem sich an den Boden jedes Bechers eine durch senkrecht zu den Seitenwänden des Schöpfrades verlaufende Bleche definierte Kammer anschließt, die sich in Richtung auf das Radinnere erstreckt und an ihrem zum Radinneren weisenden Ende offen ist. Die Bleche haben dabei lediglich die Funktion von Wasserableitblechen, die an ihrem unteren Ende derart abgekantete Schenkel aufweisen, daß auf diesen das Wasser zu einer Seite abgeleitet und durch Ausschnitte in der Seitenwand des Schöpfrades nach außen austreten kann, ohne in die Wanne zurückzugelangen.From DE-B-12 08 261 a gravel drainage device is known with a scoop dipping into a scoop with scoops distributed over the circumference, in which a chamber defined by sheets extending perpendicularly to the side walls of the scoop wheel adjoins the bottom of each cup, which extends towards the inside of the wheel and is open at its end facing the inside of the wheel. The sheets only have the function of water drainage plates which have legs bent at their lower ends in such a way that the water can be drained off to one side and exits through cutouts in the side wall of the scoop wheel without returning to the tub.

Aus der US-A-1,812,280 und der CH-PS 298 425 sind Vorrichtungen zum Waschen und Sortieren von Kies bzw. Sand bekannt, bei denen das zu waschende Material in rotierenden oder translatorischen Vorrichtungen einem Wasserstrom ausgesetzt wird.Devices for washing and sorting gravel or sand are known from US Pat. No. 1,812,280 and CH-PS 298 425, in which the material to be washed is exposed to a water stream in rotating or translatory devices.

Der Erfindung liegt die Aufgabe zugrunde, ein Entwässerungs-Schöpfrad der eingangs genannten Art zu schaffen, mit dem bei der Entwässerung des Sandes störende Bestandteile auf einfache Weise beseitigt werden können.The invention has for its object to provide a dewatering bucket of the type mentioned, with which disruptive components during the dewatering of the sand can be easily removed.

Die gestellte Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Kammern durch spiralförmige, von den Seitenwänden des Schöpfrades vollständig begrenzte Bleche gebildet werden, deren eines Ende jeweils an der zum Inneren des Schöpfrades weisenden Seite des zugehörigen Bodens befestigt ist und deren anderes Ende auf einem vorgegebenen Radius des Schöpfrades endet, daß mehrere Injektorvorrichtungen ortsfest in der Wanne unterhalb des Wasserspiegels so angeordnet sind, daß mit ihnen in die an ihnen vorbeilaufenden offenen Enden der Kammern ein Medium in Richtung auf die Böden der den Kammern zugeordneten Becher injizierbar ist, und daß die Injektion in eine Kammer unterbrochen wird, sobald die Oberfläche des zu der Kammer gehörenden auftauchenden Bechers eine vorgegebene Höhe über dem Wasserspiegel erreicht, während mindestens die nachfolgende Kammer, vorzugsweise die drei nachfolgenden Kammern, mit dem Medium beaufschlagt bleiben, daß die Injektion so stark bemessen ist, daß in den betroffenen Bechern ein Aufstrom entsteht, und daß Mittel vorgesehen sind, um das durch den Aufstrom in den Bechern gebildete Oberflächenwasser mit darin aufgeschwommenen Verunreinigungen seitlich abzuführen.The object is achieved according to the invention in that the chambers are formed by spiral, completely delimited by the side walls of the scoop wheel, one end of which is attached to the inside of the scoop wheel side of the associated bottom and the other end on one predetermined radius of the scoop wheel ends that a plurality of injector devices are arranged in the trough below the water level so that a medium can be injected with them into the open ends of the chambers passing them in the direction of the bottoms of the cups assigned to the chambers, and that the Injection into a chamber is interrupted as soon as the surface of the emerging cup belonging to the chamber reaches a predetermined height above the water level, while at least the subsequent chamber, preferably the three subsequent chambers, remain pressurized with the medium that the injection is so severe eating is that an upflow occurs in the affected beakers and that means are provided for laterally removing the surface water formed by the upflow in the beakers with impurities floating therein.

Praktische Versuche haben gezeigt, daß auf diese Weise die unerwünschten Bestandteile aus dem Sand wirksam entfernt werden können, wobei durch Einstellung von Druck und Menge des injizierten Mediums auch unerwünschter Feinsand ausgeschwemmt werden kann.Practical tests have shown that the undesired constituents can be effectively removed from the sand in this way, and by adjusting the pressure and amount of the injected medium, undesired fine sand can also be washed out.

In weiterer Ausgestaltung der Erfindung enthalten die zur Abführung des Oberflächenwassers dienenden Mittel ein die Befestigungsstelle des Bleches am Boden des Bechers überbrückendes zweites Blech, das mit den Seitenwänden des Schöpfrades, dem zu dessen Inneren weisenden Endbereich des ersten Bleches und einem sich an die Befestigungsstelle des ersten Bleches anschließenden Siebbereich eine zweite, gegenüber der ersten Kammer kleinere Kammer bildet, die mit einem seitlichen Abfluß versehen ist.In a further embodiment of the invention, the means for removing the surface water contain a second plate bridging the fastening point of the plate on the bottom of the cup, which connects with the side walls of the scoop wheel, the end region of the first plate pointing towards its interior, and one at the fastening point of the first The adjacent sieve area forms a second chamber, smaller than the first chamber, which is provided with a lateral drain.

Vorzugsweise ist dabei der sich an die Befestigungsstelle des ersten Bleches anschließende, in die zweite Kammer mündende Siebbereich mit einer größeren Siebspaltbreite versehen als der in die erste Kammer mündende Siebbesreich. Auf diese Weise kann das Oberflächenwasser mit den Verunreinigungen rasch in die zweite Kammer hineinfließen.In this case, the area of the sieve which adjoins the attachment point of the first sheet and opens into the second chamber is provided with a larger sieve gap width than the area of the sieve which opens into the first chamber. In this way, the surface water with the contaminants can quickly flow into the second chamber.

Es ist von Vorteil, in der Wanne wenigstens eine Überlaufrinne mit einem nach außen führenden Abfluß vorzusehen, die höhenverstellbar oder schwenkbar angeordnet ist. Hierdurch wird es möglich, die Menge des auszuscheidenden Feinsandes zu beeinflussen.It is advantageous to provide at least one overflow channel in the tub with an outflow leading to the outside, which is arranged to be height-adjustable or pivotable. This makes it possible to influence the amount of fine sand to be separated out.

Vorzugsweise dient als injiziertes Medium Wasser. Statt dessen kann jedoch auch Luft verwendet werden.Water is preferably used as the injected medium. However, air can be used instead.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. In der Zeichnung stellen dar:

Fig. 1
ein teilweise geschnittenes Schöpfrad in Seitenansicht,
Fig. 2
einen vergrößerten Ausschnitt aus Fig. 1 zur Veranschaulichung des Aufbaus der Becher und
Fig. 3
einen Querschnitt entlang der Linie A-B in Fig. 1
   Fig. 1 und 3 zeigen eine Wanne 1, in die ein Schöpfrad 2, das an seinem Außenumfang mit Bechern 3 versehen ist, eintaucht und langsam in Richtung des Pfeiles 4 umläuft. In die Wanne 1 wird kontinuierlich von einer nicht dargestellten Siebmaschine in Richtung des Pfeiles 5 ein ausgesiebter, mit Wasser vermengter Sand eingegeben. Die Becher nehmen bei dem Umlauf des Schöpfrades 2 das Wasser-Sandgemisch aus der Wanne 1 mit, und sobald die Becher 3 den Wasserspiegel 7 in der Wanne 1 verlassen, kann das von ihnen mitgenommene Wasser durch ihre als Spaltsiebe ausgebildeten Böden 6 in die Wanne 1 zurückfließen. Nach etwa einer halben Umdrehung im Anschluß an das Auftauchen aus dem Wasserspiegel 7 werfen die Becher 3 den weitgehend von Wasser befreiten Sand in einen Auslauf 8, von dem der Sand auf eine nicht dargestellte Förderstrecke gelangt.The invention is explained in more detail below with reference to an embodiment shown in the drawing. In the drawing:
Fig. 1
a partially cut scoop wheel in side view,
Fig. 2
an enlarged section of Fig. 1 to illustrate the structure of the cup and
Fig. 3
2 shows a cross section along the line AB in FIG. 1
1 and 3 show a trough 1 into which a scoop wheel 2, which is provided with cups 3 on its outer circumference, is immersed and rotates slowly in the direction of arrow 4. A sieved, water-mixed sand is continuously fed into the tub 1 from a sieving machine (not shown) in the direction of the arrow 5. The cups take the water-sand mixture from the tub 1 with the circulation of the scoop wheel 2, and as soon as the cups 3 leave the water level 7 in the tub 1, the water they carry can pass through their bottoms 6 designed as slotted screens into the tub 1 flow back. After about half a turn following the emergence from the water level 7, the cups 3 throw the largely water-free sand into an outlet 8, from which the sand does not onto one shown conveyor line arrives.

Wie aus Fig. 2 ersichtlich ist, enden die Enden der nach außen gekehrten Seiten der Böden 6 in einer Schneide 9, durch die die Aufnahme des Sandes aus der Wanne 1 erleichtert wird. An den Enden der nach innen gekehrten Seiten der Böden 6 ist jeweils ein massives Blech 17 befestigt, dessen Ende mit der Schneide 9 des in Umlaufrichtung folgenden Bechers verbunden ist.As can be seen from Fig. 2, the ends of the outwardly facing sides of the bottoms 6 end in a cutting edge 9, by which the absorption of the sand from the tub 1 is facilitated. At the ends of the inwardly facing sides of the bottoms 6, a solid sheet 17 is attached, the end of which is connected to the cutting edge 9 of the cup following in the circumferential direction.

An der nach innen gekehrten Seite der Böden 6 ist jeweils das eine Ende eines Bleches 10 angebracht. Die Bleche 10 verlaufen spiralförmig in Richtung zum Inneren des Schöpfrades und enden alle auf demselben Radius 11 des Schöpfrades. Die Bleche 10 bilden mit den seitlichen Begrenzungswänden 12 unter jedem der Böden 6 eine Kammer 13, die an ihrem inneren Ende offen ist. Die Böden 6 sind in bekannter Weise als Spaltsiebe ausgebildet, wobei die Bereiche der Böden, die sich von der Schneide 9 bis zur Befestigungsstelle 14 der Bleche 10 erstrecken, eine Spaltweite haben, die ein problemloses Abfließen des mitgenommenen Wassers aus den Bechern 3 ermöglicht, während die Spaltweite des Bereichs 16 der Böden von der Befestigungsstelle 14 bis zu ihrer Verbindung mit dem Blech 17 wesentlich größer ist als in dem in die Kammern 13 mündenden Bereich. Der mit der größeren Spaltweite versehene Bereich 16 mündet jeweils in eine kleine Kammer 18, die durch ein die Befestigungsstelle 14 überbrückendes Blech 19, die Begrenzungswände 12 des Schöpfrades 2, den Bereich 16 des Bodens 6 und das obere Ende des Bleches 10 gebildet wird. Die kleinen Kammern 18 sind jeweils mit einem Abfluß 20 versehen, der in eine nicht dargestellte Rinne außerhalb der Begrenzungswände 12 des Schöpfrades 2 mündet.One end of a sheet 10 is attached to the inwardly facing side of the shelves 6. The sheets 10 run spirally towards the inside of the scoop wheel and all end on the same radius 11 of the scoop wheel. The plates 10 form with the side boundary walls 12 under each of the floors 6 a chamber 13 which is open at its inner end. The bottoms 6 are designed in a known manner as slotted screens, the areas of the bottoms which extend from the cutting edge 9 to the fastening point 14 of the sheets 10 have a gap width which allows the water which has been carried along to flow away easily from the cups 3 while the gap width of the area 16 of the bottoms from the attachment point 14 to its connection to the sheet 17 is substantially larger than in the area opening into the chambers 13. The area 16 provided with the larger gap width opens into a small chamber 18, which is formed by a sheet 19 bridging the attachment point 14, the boundary walls 12 of the scoop wheel 2, the area 16 of the bottom 6 and the upper end of the sheet 10. The small chambers 18 are each provided with a drain 20 which opens into a channel, not shown, outside the boundary walls 12 of the scoop wheel 2.

In der Wanne 1 sind ortsfest unterhalb des Wasserspiegels 7 mehrere Düsen 21, die an Versorgungsrohre 22 angeschlossen sind, so angeordnet, daß in die freien Enden von mehreren Kammern 13, wenn diese an den Düsen 21 vorbeilaufen, ein Medium in Richtung auf die zu den Kammern gehörenden Böden 6 injiziert werden kann. Die Versorgungsrohre sind über regelbare Ventile 23 an eine Wasserversorgung angeschlossen. Durch die Ventile kann die Menge und der Druck des aus den Düsen 21 in die Kammern 13 injizierten Wassers eingestellt werden. Die Einstellung erfolgt in jedem Fall so, daß das injizierte Wasser bis zu den Bechern 3 gelangt und dadurch in diesen ein Aufstrom erzeugt wird, durch den Verunreinigungen, die leichter als der Sand sind, aufschwimmen.In the tub 1 are fixed below the water level 7, a plurality of nozzles 21, which are connected to supply pipes 22, so that in the free ends of a plurality of chambers 13 when they pass the nozzles 21, a medium in the direction can be injected onto the floors 6 belonging to the chambers. The supply pipes are connected to a water supply via controllable valves 23. The valves allow the amount and pressure of the water injected from the nozzles 21 into the chambers 13 to be adjusted. In any case, the setting is carried out in such a way that the injected water reaches the cups 3 and, as a result, an upflow is generated in them, through which contaminants, which are lighter than the sand, float.

Die Düsenanordnung erfolgt so, daß der Aufstrom in den Bechern erzeugt wird, die vor dem Auftauchen aus dem Wasserspiegel 7 stehen, wobei die Injektion in eine Kammer 13 unterbrochen wird, sobald die Oberfläche des zu dieser Kammer gehörenden Bechers eine vorgegebene Höhe über dem Wasserspiegel 7 erreicht. Das Oberflächenwasser mit den aufgeschwommenen unerwünschten Bestandteilen wie Holz, Kohle etc. kann nach dem Auftauchen durch den Siebbereich 16 mit der großen Spaltweite in die zugehörige kleine Kammer 18 strömen und von dort über den seitlichen Abfluß 20 abgeführt werden. Eine mit Wasser oder Luft gespeiste ortsfeste Düsenanordnung 24, die seitlich auf die Oberfläche des jeweils auftauchenden Bechers gerichtet ist, kann dabei das Hineinströmen in die Kammer 18 unterstützen. Bei einer praktischen Ausführungsform hat sich eine Siebweite von etwa 6 mm im Bereich 16 der Böden 6 als geeignet erwiesen, während die Siebweite im übrigen Bereich der Böden etwa 1 mm beträgt. Die Anzahl der jeweils von den Düsen 21 beaufschlagten Kammern 13 hängt von den jeweiligen Umständen ab und kann diesen Umständen entsprechend mittels der Ventile 23 gewählt und angepaßt werden.The nozzle arrangement is carried out in such a way that the upflow is generated in the cups which stand before emerging from the water level 7, the injection into a chamber 13 being interrupted as soon as the surface of the cup belonging to this chamber is a predetermined height above the water level 7 reached. The surface water with the floating undesirable constituents such as wood, coal etc. can, after emerging, flow through the screen area 16 with the large gap width into the associated small chamber 18 and be discharged from there via the side drain 20. A stationary nozzle arrangement 24, fed with water or air, which is directed laterally onto the surface of the cup that appears in each case, can assist the flow into the chamber 18. In a practical embodiment, a sieve width of approximately 6 mm in the region 16 of the trays 6 has proven to be suitable, while the sieve width in the remaining region of the trays is approximately 1 mm. The number of the chambers 13 acted upon by the nozzles 21 depends on the respective circumstances and can be selected and adapted accordingly by means of the valves 23.

Die Höhe des Wasserspiegels kann durch einen einfachen Überlauf konstant gehalten werden, jedoch können auch Regelvorrichtungen vorgesehen werden, die die Ventile 23 oder Pumpen steuern.The level of the water level can be kept constant by a simple overflow, but control devices can also be provided which control the valves 23 or pumps.

Von Vorteil ist, wenn ein Überlauf in Form von zwei Überlaufrinnen 25 vorgesehen ist, die an einander gegenüberliegenden Seiten innerhalb der Wanne 1 angeordnet sind, und von denen ein Abflußstutzen 26 nach außen führt. Die Abflußrinnen 25 sind in der Höhe verstellbar gelagert. Bei dem dargestellten Ausführungsbeispiel sind die Überlaufrinnen 25 jeweils um eine zu ihrer Längsausdehnung senkrecht verlaufende horizontale Achse 27 schwenkbar gelagert, die zugleich die Achse des Abflußstutzens 26 ist. Die Schwenkachse 27 mit dem Abflußstutzen 26 ist jeweils nahe einem Ende der Überlaufrinne angeordnet. In der Normalstellung verlaufen die Oberkanten der Überlaufrinnen horizontal. In dieser Stellung ist der Wasserspiegel am höchsten, und der Überlauf des Wassers erfolgt auf der gesamten Länge der Überlaufrinnen. In diesem Fall wird wenig Feinsand ausgeschieden.It is advantageous if an overflow is provided in the form of two overflow channels 25 which are located opposite one another Sides are arranged inside the tub 1, and from which a drain pipe 26 leads to the outside. The troughs 25 are mounted adjustable in height. In the illustrated embodiment, the overflow channels 25 are each pivotably mounted about a horizontal axis 27 extending perpendicularly to their longitudinal extent, which is also the axis of the drain connector 26. The pivot axis 27 with the drain port 26 is arranged near one end of the overflow channel. In the normal position, the upper edges of the overflow channels run horizontally. In this position the water level is at its highest and the water overflows along the entire length of the overflow channels. In this case, little fine sand is excreted.

Um mehr Feinsand auszuscheiden, werden die Überlaufrinnen durch Schwenken um ihre Achsen 27 an dem dem Abflußstutzen gegenüberliegenden Ende abgesenkt. Dadurch wird der Wasserspiegel abgesenkt. Außerdem erfolgt der Wasserüberlauf nicht mehr auf der gesamten Länge der Rinnen, sondern nur noch auf einem Teilstück. In diesem Bereich ist dann die Strömungsgeschwindigkeit des Wassers entsprechend größer, so daß mehr Feinsand ausgeschieden wird.In order to separate out more fine sand, the overflow channels are lowered by swiveling about their axes 27 at the end opposite the discharge nozzle. This lowers the water level. In addition, the water overflow no longer takes place along the entire length of the channels, but only on a section. In this area the flow velocity of the water is correspondingly higher, so that more fine sand is separated out.

Wenn - wie dargestellt - zwei Überlaufrinnen 25 vorgesehen werden, sollte die Schwenkbewegung synchronisiert werden. Die Mittel für die Ausführung der Schwenkbewegung können beliebig ausgebildet sein. Z.B. kann das freie Ende der Überlaufrinnen 25 mechanisch, hydraulisch oder pneumatisch abgesenkt und angehoben werden. Eine einfache Lösung ist in Fig. 1 angedeutet. Dort ist am freien Ende der Überlaufrinne 25 eine Spindel 28 drehbar gelagert, die mittels eines Handrades 29, das sich auf einer ortsfesten, vorzugsweise mit der Wanne 1 verbundenen Platte 30 abstützt, in ihrer Achsrichtung verstellbar ist und dadurch die Überlaufrinne 25 um die Achse 27 schwenkt.If - as shown - two overflow channels 25 are provided, the pivoting movement should be synchronized. The means for executing the pivoting movement can be of any design. E.g. the free end of the overflow channels 25 can be lowered and raised mechanically, hydraulically or pneumatically. A simple solution is indicated in Fig. 1. There, at the free end of the overflow channel 25, a spindle 28 is rotatably mounted, which is adjustable in its axial direction by means of a handwheel 29, which is supported on a stationary plate 30, preferably connected to the tub 1, and thereby the overflow channel 25 about the axis 27 pivots.

Natürlich muß auch dafür gesorgt werden, daß eine ausreichende Abdichtung zwischen der Wanne 1 und dem jeweiligen Abflußstutzen 26 vorhanden ist, damit kein Wasser außerhalb des Abflußstutzens 26 austritt.Of course, care must also be taken to ensure that a sufficient seal between the tub 1 and the respective Drain connector 26 is present so that no water escapes outside the drain connector 26.

Das den Düsen 21 zugeführte Medium ist vorzugsweise Wasser, jedoch wäre es statt dessen auch möglich, den gewünschten Aufstrom der unerwünschten Bestandteile des Sandes durch Luft zu bewirken.The medium supplied to the nozzles 21 is preferably water, but instead it would also be possible to effect the desired upward flow of the undesired constituents of the sand by air.

Claims (13)

  1. Hydroextraction bucket wheel (2), which is mounted rotatably in a trough (1), for sand-preparing plants, in which the buckets (3) disposed on the periphery of the bucket wheel (2) run through the trough (1), which trough can be charged with the sand-water mixture, in which the bases (6) of the buckets (3) are configured as slotted hole screens for the run-off of the water carried with them out of the trough, and in which the base (6) of each bucket (3) is adjoined by a chamber (13) which is defined by plates (10) running perpendicular to the side walls (12) of the bucket wheel (2) and which extends in the direction of the wheel interior and is open at its end pointing towards the wheel interior, characterized in that the chambers (13) are formed by spiral plates (10), which are limited fully by the side walls (12) of the bucket wheel (2) and the one end of which is attached in each case to that side of the associated base (6) pointing towards the interior of the bucket wheel (2) and the other end of which ends on a predefined radius (11) of the bucket wheel (2), in that a plurality of injector devices (21) are disposed in fixed position in the trough (1) beneath the water level (7) such that they can be used to inject a medium into the open ends, running past them, of the chambers (13), in the direction of the bases (6) of the buckets (3) assigned to the chambers, in that the injection into a chamber (13) is interrupted as soon as the surface of the emerging bucket (3) belonging to the chamber (13) reaches a predefined height above the water level, whilst at least the following chamber, preferably the three following chambers, continue to be bombarded by the medium, in that the injection is calculated to be of such a strength that an up-current is generated in the buckets (3) concerned, and in that means (20) are provided for laterally evacuating the surface water formed by the up-current in the buckets (3), together with impurities which have floated therein to the surface.
  2. Bucket wheel according to Claim 2, characterized in that means (23, 25) are provided for keeping the water level (7) constant.
  3. Bucket wheel according to Claim 2, characterized in that the means serving to evacuate the surface water contain a second plate (19), which bridges the point of attachment (14) of the plate (10) to the base (6) of the bucket (3) and which forms with the side walls (12) of the bucket wheel (2), with that end region of the first plate (10) pointing towards its interior and with a screen region (16) adjoining the point of attachment (14) of the first plate (10) a second chamber (18), which is smaller in relation to the first chamber (13) and is provided with a lateral outflow (20).
  4. Bucket wheel according to Claim 3, characterized in that the screen region (16) which adjoins the point of attachment (14) of the first plate (10) and opens out into the second chamber (18) is provided with a larger screen gap width than the screen region opening out into the first chamber (13).
  5. Bucket wheel according to Claims 1 to 4, characterized in that the injected medium is water.
  6. Bucket wheel according to Claims 1 to 4, characterized in that the injected medium is air.
  7. Bucket wheel according to one of Claims 1 to 6, characterized in that a further injector (24) is provided, which is directed at the water surface of the respectively emerging bucket (3) in such a way that a flow of the surface water in the direction of the second chamber (18) is generated.
  8. Bucket wheel according to one of Claims 1 to 7, characterized in that in the trough (1) there is provided at least one overflow channel (25) having an outwardleading outflow (26).
  9. Bucket wheel according to Claim 8, characterized in that the at least one overflow channel (25) is disposed such that it is vertically adjustable.
  10. Bucket wheel according to Claim 9, characterized in that the at least one overflow channel (25) is mounted pivotably about a horizontal axis (27) running transversely to its longitudinal extent.
  11. Bucket wheel according to Claim 10, characterized in that the swivel axis (27) is the axis of the outflow pipe (26).
  12. Bucket wheel according to Claim 11, characterized in that the swivel axis (27) is disposed close to one end of the at least one overflow channel (25).
  13. Bucket wheel according to Claim 12, characterized in that two overflow channels (25) are disposed close to two opposite sides of the trough.
EP89105330A 1988-07-07 1989-03-25 Dewatering scoop wheel for sand dressing plants Expired - Lifetime EP0349710B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823028 1988-07-07
DE3823028A DE3823028A1 (en) 1988-07-07 1988-07-07 DRAINAGE CUTTER WHEEL FOR SAND PREPARATION PLANTS

Publications (3)

Publication Number Publication Date
EP0349710A2 EP0349710A2 (en) 1990-01-10
EP0349710A3 EP0349710A3 (en) 1990-12-19
EP0349710B1 true EP0349710B1 (en) 1994-06-08

Family

ID=6358171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105330A Expired - Lifetime EP0349710B1 (en) 1988-07-07 1989-03-25 Dewatering scoop wheel for sand dressing plants

Country Status (4)

Country Link
EP (1) EP0349710B1 (en)
AT (1) ATE106778T1 (en)
DE (2) DE3823028A1 (en)
DK (1) DK231689A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4021318A1 (en) * 1990-07-04 1992-01-09 Michael Brenner Installation for reuse of concrete residue - incorporates water filled through with bucket wheel rotor
DE4214948C2 (en) * 1992-05-06 1994-02-17 Ajo Anlagentechnik Gmbh & Co K Drainage system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1812280A (en) * 1928-11-15 1931-06-30 Guy B Bebout Method and apparatus for cleaning gravel or the like
CH298425A (en) * 1951-10-11 1954-05-15 Ratzinger Karl Trough washing and sorting machine.
DE1208261B (en) * 1964-06-24 1966-01-05 Stichweh K G Maschinenfabrik Gravel drainage device

Also Published As

Publication number Publication date
DE3823028A1 (en) 1990-01-11
DK231689A (en) 1990-01-08
DE58907813D1 (en) 1994-07-14
ATE106778T1 (en) 1994-06-15
DK231689D0 (en) 1989-05-12
EP0349710A3 (en) 1990-12-19
EP0349710A2 (en) 1990-01-10

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