EP3512644B1 - Screening machine for separating coarse material and fine material from excavated earth - Google Patents

Screening machine for separating coarse material and fine material from excavated earth Download PDF

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Publication number
EP3512644B1
EP3512644B1 EP17767813.3A EP17767813A EP3512644B1 EP 3512644 B1 EP3512644 B1 EP 3512644B1 EP 17767813 A EP17767813 A EP 17767813A EP 3512644 B1 EP3512644 B1 EP 3512644B1
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EP
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Prior art keywords
screening machine
conveyor
machine according
drivers
bucket
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EP17767813.3A
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German (de)
French (fr)
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EP3512644A1 (en
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Günter Holp
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Holp GmbH
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Holp GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/02—Apparatus for grading using pockets for taking out particles from aggregates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
    • B07B13/05—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size using material mover cooperating with retainer, deflector or discharger

Definitions

  • the invention relates to a screening machine for separating coarse and fine material from excavated earth.
  • the invention further relates to an attachment for an earth-moving machine with such a screening machine.
  • screening work has to be carried out on site when processing soil, e.g. for filling pipe trenches or covering cables. These are essentially used to keep stones out of the ground to prevent damage to the pipes or cables.
  • soil e.g. for filling pipe trenches or covering cables. These are essentially used to keep stones out of the ground to prevent damage to the pipes or cables.
  • screening for processing near-surface soil is becoming increasingly important.
  • it is known to cause a screen formed by a lattice, holes or meshes to oscillate and to separate the material to be screened by the vibration generated.
  • cohesive material such as humus from excavated earth, which often sticks to the grid and can then no longer be separated.
  • the invention is based on the object of further improving the devices known in the prior art and of enabling simple separation and, if necessary, conversion to different grain sizes with the lowest possible structural weight.
  • a machine with the features of claim 1 which screening machine contains: an endlessly revolving conveyor that can be loaded with the excavated earth, is driven by a motor, and has a large number of carriers that revolve at a distance from one another, with the fine material in between can be transported in the receiving spaces kept free by the carriers, and wherein a stationary collector rake removes the coarse material from the carriers passing through at least at one separation point. Due to the continuous circulation of the conveyor, the material to be screened is removed in layers, with only a small mass having to be moved on the machine side, so that the overall construction is also light. This makes it possible in a special way to divide excavated earth and, in particular, loamy soils into fractions.
  • the carriers are guided over a deflection roller of the conveyor arranged downstream of the doffer rake, with the fine material being able to be ejected from the receiving spaces on the deflecting roller and possibly reused.
  • An advantageous embodiment for a stationary arrangement provides that a feed hopper for the excavated earth is arranged on the conveyor. In this way, the material to be screened can also be picked up in portions and simply filled in.
  • a further improvement results from the fact that the pick-up rake forms a run-up slope for the coarse material that is set at an angle to the orbit of the conveyor. In this way, the coarse material is reliably lifted off by the carriers that are passing through.
  • the collector rake has a plurality of guide rods running parallel to one another, the lateral spacing of the guide rods from one another being adapted or adaptable to a grain size of the coarse material.
  • the catches are designed as protruding links of a link belt of the conveyor.
  • a further advantage results from the fact that the carriers or the link belt are provided with floor structures designed, for example, as profile elements, so that a floor-side support in the receiving spaces prevents the material picked up from falling through.
  • a particularly favorable design for separating material to be conveyed provides that the carriers each comprise a toothed strip, the toothed strips being aligned transversely to the orbit of the conveyor and with their teeth pointing away from the orbit to the outside.
  • the direction of rotation of the conveyor is reversible.
  • the conveyor has a receiving run loaded with the excavated earth and a return run, with a pick-up rake each having a different retaining size for the coarse material being arranged at the two ends of the receiving run. Different fractionation can thus be achieved depending on the direction of circulation.
  • a particularly simple drive system provides that a hydraulically or electrically operated motor is coupled to a deflection roller of the conveyor.
  • a further aspect of the invention relates to an attachment for an earth-moving machine, in particular an excavator, with a digging bucket and a screening machine according to the invention arranged on the digging bucket.
  • a special attachment with multifunctional use can be realized in that the screening machine is held pivotably on the bucket and can be pivoted against a bucket opening of the digging bucket by means of a pivoting device.
  • a structurally simple variant provides that the screening machine is arranged in an open back area of the digging bucket opposite the digging opening in a stationary manner.
  • the screening machine 10 shown enables the separation of coarse and fine material from excavated earth, as it occurs, for example, in gardening and landscaping in the design of earth near the surface.
  • the coarse material is often formed by stones or root pieces that have to be removed, while humus can be reused as fine material.
  • a conveyor 12 that can be loaded with the excavated earth is provided, which has a large number of carriers 14 running one behind the other to delimit receiving spaces 16 for the fine material, with a fixed collector rake 20 at at least one separation point 18 removing the coarse material from the continuous driver 14 decreases.
  • a feed hopper 22 tapering downwards is provided in order to feed the excavated earth onto the conveyor 12 in a targeted manner.
  • the device 10 can be operated stationary on a frame, not shown.
  • the conveyor 12 has an upper strand or receiving strand 24 loaded with the excavated earth, for example via the funnel 22 , and a lower strand or return strand 26 and two deflection rollers 28 .
  • a drive of the conveyor 12, embodied, for example, as an electric or hydraulic motor 30, is coupled to one of the deflection rollers 28, as is shown in FIG 1 symbolically illustrated. The direction of rotation of the motor 30 can be reversed, so that the circulation of the conveyor 12 can be reversed.
  • a pickup rake 20 is arranged at each of the two ends of the receiving strand 24 or in front of the two deflection rollers 28, the pickup rakes 20 having different retaining sizes for the coarse material, as will be explained in more detail below.
  • a knife-like breaking bar 32 can be provided at each separation point 18, the cutting edge of which protrudes just beyond the driver 14 and separates the material that is still protruding.
  • the drivers 14 are designed as protruding links of an endless link belt 34 of the conveyor 12 . This is achieved in that the drivers 14 each comprise an angled toothed strip 36, the toothed strips 36 being aligned transversely to the orbit or transport direction and with their teeth 38 pointing outwards away from the orbit.
  • the doffer rakes 20 engage the spaces or gaps between the teeth 38 of each driver 14 .
  • the collector rakes 20 have a plurality of guide rods 40 which run continuously between the separation points 20 below the free ends of the teeth 38 .
  • the guide rods 40 are angled upwards relative to the orbit or the upper run 24, so that there is a run-on slope for the coarse material.
  • the fine material remaining in the receiving spaces 16 passes through the pick-up rake 20 and is ejected at the deflection roller 28 downstream in the direction of transport. This is supported by the receiving spaces 16, which increase in size in the deflection area (see 3 ) and by occurring centrifugal forces.
  • the guide rods 40 do not have to engage in every gap between the teeth 38, so that the sieve size can be varied or adapted to a desired minimum grain size of the coarse material. It is also conceivable that the two pick-up rakes 20 have screen sizes that are different from one another and possibly do not engage in the upper run 24 .
  • the carriers 14 made of angle profiles are fixed to a chain drive 42 which runs on the deflection rollers 28 via gear wheels 44 .
  • the chain drive 42 comprises two parallel circulating chains, with the links of which the drivers 14 are firmly connected at their end sections.
  • FIG. 4 shows an embodiment with a screening machine 10 on a digging bucket 46.
  • the screening machine 10 is constructed essentially the same as the stationary variant described above.
  • a combined attachment or working tool for an earth-moving machine, for example an excavator, is thus realized, so that digging or excavation and screening work can be carried out in a mobile manner.
  • the digging bucket 46 can be connected to the free end of the excavator boom via a quick-change device 48 .
  • a hydraulic pivoting drive 50 is arranged on the upper boundary wall of the bucket 46, which allows a pivoting movement of the screening machine 10 against the opening 52 of the bucket 46. In the open state with the screening machine 10 swiveled away, earth can be dug up, while the material picked up can be screened out when the screening machine 10 is folded in, with the spoon 46 then fulfilling the function of the feed hopper 22 .
  • the screening machine 10 is oriented during operation in such a way that the excavated earth or the material to be separated reaches the upper run 24 under the influence of gravity.
  • the distances between the drivers 14 are dimensioned in such a way that the coarse material cannot penetrate into the receiving spaces 16 but remains lying on top of the drivers 14 .
  • the fine material fills the receiving spaces 16 .
  • the carrying leg of the driver 14 lying in the transport path prevents the fine material from being able to pass directly through the upper run 24 .
  • the coarse material is removed from the carriers 14 at the removal rake or rakes 20, while the fine material is transported further and ejected in the deflection area.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Description

Die Erfindung betrifft eine Siebmaschine zur Trennung von Grob- und Feingut aus Erdaushub. Die Erfindung betrifft weiter ein Anbaugerät für eine Erdbaumaschine mit einer solchen Siebmaschine.The invention relates to a screening machine for separating coarse and fine material from excavated earth. The invention further relates to an attachment for an earth-moving machine with such a screening machine.

In der Bauindustrie sind in der Verarbeitung von Böden, z.B. zur Verfüllung von Rohrgräben oder zur Abdeckung von Kabeln, Siebarbeiten auf der Baustelle zu verrichten. Diese dienen im Wesentlichen der Fernhaltung von Steinen aus der Erde, um Beschädigungen an den Rohrleitungen oder Kabeln zu verhindern. Im Garten und Landschaftsbau gewinnt das Sieben zur Verarbeitung oberflächennaher Erden zusehends an Bedeutung. Bei herkömmlichen Siebanlagen ist es bekannt, ein durch ein Gitter, Löcher oder Maschen gebildetes Sieb in Schwingung zu versetzen und durch die erzeugte Vibration das Siebgut zu trennen. Dies ist allerdings problematisch bei bindigem Material wie beispielsweise Humus aus Erdaushub, welcher häufig mit dem Gitter verklebt und sich dann nicht mehr trennen lässt.In the construction industry, screening work has to be carried out on site when processing soil, e.g. for filling pipe trenches or covering cables. These are essentially used to keep stones out of the ground to prevent damage to the pipes or cables. In gardening and landscaping, screening for processing near-surface soil is becoming increasingly important. In conventional screening plants, it is known to cause a screen formed by a lattice, holes or meshes to oscillate and to separate the material to be screened by the vibration generated. However, this is problematic with cohesive material such as humus from excavated earth, which often sticks to the grid and can then no longer be separated.

Das Dokument US-A-3209911 offenbart eine Siebmaschine gemäß dem Oberbegriff des Anspruchs 1.The document US-A-3209911 discloses a screening machine according to the preamble of claim 1.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die im Stand der Technik bekannten Vorrichtungen und weiter zu verbessern und bei möglichst reduziertem Baugewicht eine einfache Trennung und ggf. Umstellung auf verschiedene Korngrößen zu ermöglichen.Proceeding from this, the invention is based on the object of further improving the devices known in the prior art and of enabling simple separation and, if necessary, conversion to different grain sizes with the lowest possible structural weight.

Zur Lösung dieser Aufgabe wird die im Patentanspruch 1 bzw. 11 angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.To solve this problem, the combination of features specified in claim 1 or 11 is proposed. Advantageous refinements and developments of the invention result from the dependent claims.

Die Erfindung geht von dem Gedanken aus, einen Förderstrom zu erzeugen, der an einer Trennstelle nach Korngrößen klassiert wird. Dementsprechend wird in einer ersten Variante eine Maschine mit den Merkmalen des Anspruchs 1 vorgeschlagen, welche Siebmaschine enthält: einen mit dem Erdaushub beaufschlagbaren, mittels eines Motors angetriebenen, endlos umlaufenden Förderer, der eine Vielzahl von im Abstand voneinander umlaufenden Mitnehmern aufweist, wobei das Feingut in zwischen den Mitnehmern freigehaltenen Aufnahmeräumen transportierbar ist, und wobei an mindestens einer Trennstelle ein feststehender Abnehmerrechen das Grobgut von den durchlaufenden Mitnehmern abnimmt. Durch den kontinuierlichen Umlauf des Förderers wird das Siebgut schichtweise abgetragen, wobei maschinenseitig nur eine geringe Masse bewegt werden muss, so dass die Konstruktion auch insgesamt leicht wird. Damit ist es in besonderer Weise möglich, Erdaushub und insbesondere auch lehmhaltige Böden in Fraktionen zu teilen.The invention is based on the idea of generating a conveying flow that is classified according to grain sizes at a separation point. Accordingly In a first variant, a machine with the features of claim 1 is proposed, which screening machine contains: an endlessly revolving conveyor that can be loaded with the excavated earth, is driven by a motor, and has a large number of carriers that revolve at a distance from one another, with the fine material in between can be transported in the receiving spaces kept free by the carriers, and wherein a stationary collector rake removes the coarse material from the carriers passing through at least at one separation point. Due to the continuous circulation of the conveyor, the material to be screened is removed in layers, with only a small mass having to be moved on the machine side, so that the overall construction is also light. This makes it possible in a special way to divide excavated earth and, in particular, loamy soils into fractions.

Vorteilhafterweise sind die Mitnehmer über eine dem Abnehmerrechen nachgeordnete Umlenkrolle des Förderers geführt, wobei an der Umlenkrolle das Feingut aus den Aufnahmeräumen auswerfbar ist und ggf. wiederverwertbar ist.Advantageously, the carriers are guided over a deflection roller of the conveyor arranged downstream of the doffer rake, with the fine material being able to be ejected from the receiving spaces on the deflecting roller and possibly reused.

Eine vorteilhafte Ausgestaltung für eine stationäre Anordnung sieht vor, dass an dem Förderer ein Aufgabetrichter für den Erdaushub angeordnet ist. Auf diese Weise kann das Siebgut auch portionsweise aufgenommen und einfach eingefüllt werden.An advantageous embodiment for a stationary arrangement provides that a feed hopper for the excavated earth is arranged on the conveyor. In this way, the material to be screened can also be picked up in portions and simply filled in.

Eine weitere Verbesserung ergibt sich dadurch, dass der Abnehmerrechen eine schräg zur Umlaufbahn des Förderers angestellte Anlaufschräge für das Grobgut bildet. Damit wird das Grobgut von den durchlaufenden Mitnehmern zuverlässig abgehoben.A further improvement results from the fact that the pick-up rake forms a run-up slope for the coarse material that is set at an angle to the orbit of the conveyor. In this way, the coarse material is reliably lifted off by the carriers that are passing through.

In diesem Zusammenhang ist es auch von Vorteil, wenn der Abnehmerrechen eine Mehrzahl von parallel zueinander verlaufenden Führungsstäben aufweist, wobei der seitliche Abstand der Führungsstäbe voneinander auf eine Korngröße des Grobguts angepasst oder anpassbar ist.In this context, it is also advantageous if the collector rake has a plurality of guide rods running parallel to one another, the lateral spacing of the guide rods from one another being adapted or adaptable to a grain size of the coarse material.

Zum Abnehmen des Erdaushubs ist es vorteilhaft, wenn die Mitnehmer als abstehende Glieder eines Gliederbands des Förderers ausgebildet sind. Ein weiterer Vorteil ergibt sich dadurch, dass die Mitnehmer bzw. das Gliederband mit beispielsweise als Profilelemente ausgebildeten Bodenstrukturen versehen sind, so dass durch eine bodenseitige Abstützung in den Aufnahmeräumen ein Durchfallen des aufgenommenen Materials verhindert wird.To remove the excavated earth, it is advantageous if the catches are designed as protruding links of a link belt of the conveyor. A further advantage results from the fact that the carriers or the link belt are provided with floor structures designed, for example, as profile elements, so that a floor-side support in the receiving spaces prevents the material picked up from falling through.

Eine besonders günstige Konstruktion zur Abtrennung von zu förderndem Material sieht vor, dass die Mitnehmer jeweils eine Zahnleiste umfassen, wobei die Zahnleisten quer zur Umlaufbahn des Förderers ausgerichtet sind und mit ihren Zähnen von der Umlaufbahn weg nach außen weisen.A particularly favorable design for separating material to be conveyed provides that the carriers each comprise a toothed strip, the toothed strips being aligned transversely to the orbit of the conveyor and with their teeth pointing away from the orbit to the outside.

In diesem Zusammenhang lässt sich eine weitere Verbesserung dadurch erreichen, dass der Abnehmerrechnen in Zwischenräume zwischen den Zähnen eingreift.In this connection, a further improvement can be achieved in that the pick-up rake engages in spaces between the teeth.

Um Zwischengrößen des Siebguts zu berücksichtigen, ist es von Vorteil, wenn an der Trennstelle eine Brechleiste zum Brechen von über den Mitnehmern überstehendem Erdaushubmaterial angeordnet ist.In order to take into account intermediate sizes of the material to be screened, it is advantageous if a breaking bar for breaking up excavated material protruding over the drivers is arranged at the separation point.

Gemäß der Erfindung ist die Umlaufrichtung des Förderers umkehrbar.According to the invention, the direction of rotation of the conveyor is reversible.

Damit lässt sich auch im Falle einer Verkeilung von Material durch Reversieren der Betrieb aufrechterhalten.This means that operation can be maintained by reversing even if material becomes wedged.

Gemäß der Erfindung weist der Förderer ein mit dem Erdaushub beaufschlagtes Aufnahmetrum und ein Rücklauftrum auf, wobei an den beiden Enden des Aufnahmetrums jeweils ein Abnehmerrechen mit voneinander unterschiedlicher Rückhaltegröße für das Grobgut angeordnet ist. Damit lässt sich je nach Umlaufrichtung eine unterschiedliche Fraktionierung erreichen.According to the invention, the conveyor has a receiving run loaded with the excavated earth and a return run, with a pick-up rake each having a different retaining size for the coarse material being arranged at the two ends of the receiving run. Different fractionation can thus be achieved depending on the direction of circulation.

Ein besonders einfaches Antriebssystem sieht vor, dass ein hydraulisch oder elektrisch arbeitender Motor mit einer Umlenkrolle des Förderers gekoppelt ist.A particularly simple drive system provides that a hydraulically or electrically operated motor is coupled to a deflection roller of the conveyor.

Ein weiterer Aspekt der Erfindung betrifft ein Anbaugerät für eine Erdbaumaschine, insbesondere einen Bagger, mit einem Grablöffel und einer an dem Grablöffel angeordneten erfindungsgemäßen Siebmaschine. Dadurch kann in einem Arbeitsablauf das Material aufgenommen und Feingut ausgesiebt werden. Das zurückgehaltene Grobgut kann auf einfache Weise für den Abtransport zusammengeführt werden.A further aspect of the invention relates to an attachment for an earth-moving machine, in particular an excavator, with a digging bucket and a screening machine according to the invention arranged on the digging bucket. This means that the material can be picked up and fines can be screened out in one work process. The retained coarse material can easily be brought together for transport.

Ein besonderes Anbaugerät mit multifunktionalem Nutzen lässt sich dadurch realisieren, dass die Siebmaschine an dem Löffel schwenkbar gehalten und mittels einer Schwenkeinrichtung gegen eine Löffelöffnung des Grablöffels verschwenkbar ist.A special attachment with multifunctional use can be realized in that the screening machine is held pivotably on the bucket and can be pivoted against a bucket opening of the digging bucket by means of a pivoting device.

Eine baulich einfache Variante sieht vor, dass die Siebmaschine in einem offenen Rückenbereich des Grablöffels gegenüber der Graböffnung feststehend angeordnet ist.A structurally simple variant provides that the screening machine is arranged in an open back area of the digging bucket opposite the digging opening in a stationary manner.

Im Folgenden wird die Erfindung anhand der in der Zeichnung schematisch dargestellten Ausführungsbeispiele näher erläutert. Es zeigen:

Fig. 1
eine Siebmaschine zur Trennung von Grob- und Feingut aus Erdaushub in perspektivischer Darstellung;
Fig. 2
eine vergrößerte Darstellung der Siebmaschine nach Fig. 1 ohne Aufgabetrichter;
Fig. 3
einen Längsschnitt durch die Siebmaschine;
Fig. 4
einen mit einer Siebmaschine bestückten Grablöffel für eine Erdbaumaschine in perspektivischer Darstellung.
The invention is explained in more detail below with reference to the exemplary embodiments shown schematically in the drawing. Show it:
1
a perspective view of a screening machine for separating coarse and fine material from excavated earth;
2
an enlarged view of the screening machine 1 without feed hopper;
3
a longitudinal section through the screening machine;
4
a perspective view of a digging bucket equipped with a screening machine for an earth-moving machine.

Die in Fig. 1 gezeigte Siebmaschine 10 ermöglicht die Trennung von Grob- und Feingut aus Erdaushub, wie er beispielsweise im Garten- und Landschaftsbau bei der Gestaltung oberflächennaher Erden anfällt. Das Grobgut wird hierbei oft durch zu entfernende Steine oder Wurzelstücke gebildet, während Humus als Feingut wiederverwertbar ist. Um die Trennung bzw. Klassierung zu ermöglichen, ist ein mit dem Erdaushub beaufschlagbarer Förderer 12 vorgesehen, der eine Vielzahl von hintereinander laufenden Mitnehmern 14 zur Begrenzung von Aufnahmeräumen 16 für das Feingut aufweist, wobei an mindestens einer Trennstelle 18 ein feststehender Abnehmerrechen 20 das Grobgut von den durchlaufenden Mitnehmern 14 abnimmt.In the 1 The screening machine 10 shown enables the separation of coarse and fine material from excavated earth, as it occurs, for example, in gardening and landscaping in the design of earth near the surface. The coarse material is often formed by stones or root pieces that have to be removed, while humus can be reused as fine material. In order to enable the separation or classification, a conveyor 12 that can be loaded with the excavated earth is provided, which has a large number of carriers 14 running one behind the other to delimit receiving spaces 16 for the fine material, with a fixed collector rake 20 at at least one separation point 18 removing the coarse material from the continuous driver 14 decreases.

Bei dem Ausführungsbeispiel nach Fig. 1 ist ein nach unten sich verjüngender Aufgabetrichter 22 vorgesehen, um den Erdaushub gezielt auf den Förderer 12 aufzugeben. Dabei kann die Vorrichtung 10 stationär auf einem nicht gezeigten Gestell betrieben werden.In the embodiment according to 1 a feed hopper 22 tapering downwards is provided in order to feed the excavated earth onto the conveyor 12 in a targeted manner. The device 10 can be operated stationary on a frame, not shown.

Wie auch aus Fig. 2 und 3 ersichtlich, weist der Förderer 12 ein beispielsweise über den Trichter 22 mit dem Erdaushub beaufschlagtes Obertrum bzw. Aufnahmetrum 24 und ein Untertrum bzw. Rücklauftrum 26 und zwei Umlenkrollen 28 auf. Ein beispielsweise als elektrischer oder hydraulischer Motor 30 ausgebildeter Antrieb des Förderers 12 ist mit einer der Umlenkrollen 28 gekoppelt, wie es in Fig. 1 symbolisch veranschaulicht ist. Dabei ist der Motor 30 in seiner Drehrichtung reversierbar, so dass der Umlauf des Förderers 12 umkehrbar ist.As well as from 2 and 3 As can be seen, the conveyor 12 has an upper strand or receiving strand 24 loaded with the excavated earth, for example via the funnel 22 , and a lower strand or return strand 26 and two deflection rollers 28 . A drive of the conveyor 12, embodied, for example, as an electric or hydraulic motor 30, is coupled to one of the deflection rollers 28, as is shown in FIG 1 symbolically illustrated. The direction of rotation of the motor 30 can be reversed, so that the circulation of the conveyor 12 can be reversed.

An den beiden Enden des Aufnahmetrums 24 bzw. vor beiden Umlenkrollen 28 ist jeweils ein Abnehmerrechen 20 angeordnet, wobei die Abnehmerrechen 20 voneinander unterschiedliche Rückhaltegrößen für das Grobgut besitzen, wie es nachstehend näher erläutert ist.A pickup rake 20 is arranged at each of the two ends of the receiving strand 24 or in front of the two deflection rollers 28, the pickup rakes 20 having different retaining sizes for the coarse material, as will be explained in more detail below.

An jeder Trennstelle 18 kann eine messerartige Brechleiste 32 vorgesehen sein, die mit ihrer Schneide knapp über die Mitnehmer 14 übersteht und das noch überstehende Material abtrennt.A knife-like breaking bar 32 can be provided at each separation point 18, the cutting edge of which protrudes just beyond the driver 14 and separates the material that is still protruding.

Die Mitnehmer 14 sind als abstehende Glieder eines endlosen Gliederbands 34 des Förderers 12 ausgebildet. Dies wird dadurch realisiert, dass die Mitnehmer 14 jeweils eines abgewinkelte Zahnleiste 36 umfassen, wobei die Zahnleisten 36 quer zur Umlaufbahn bzw. Transportrichtung ausgerichtet sind und mit ihren Zähnen 38 von der Umlaufbahn weg nach außen weisen.The drivers 14 are designed as protruding links of an endless link belt 34 of the conveyor 12 . This is achieved in that the drivers 14 each comprise an angled toothed strip 36, the toothed strips 36 being aligned transversely to the orbit or transport direction and with their teeth 38 pointing outwards away from the orbit.

Die Abnehmerrechen 20 greifen in die Zwischenräume bzw. Lücken zwischen den Zähnen 38 eines jeden Mitnehmers 14 ein. Um zugleich eine Führungsfunktion zu vermitteln, besitzen die Abnehmerrechen 20 eine Mehrzahl von Führungsstäben 40, die zwischen den Trennstellen 20 unterhalb der freien Enden der Zähne 38 durchgehend verlaufen. An ihren davon abgewandten Endabschnitten sind die Führungsstäbe 40 gegenüber der Umlaufbahn bzw. dem Obertrum 24 nach oben abgewinkelt, so dass sich eine Anlaufschräge für das Grobgut ergibt.The doffer rakes 20 engage the spaces or gaps between the teeth 38 of each driver 14 . In order to provide a guide function at the same time, the collector rakes 20 have a plurality of guide rods 40 which run continuously between the separation points 20 below the free ends of the teeth 38 . At their end sections facing away therefrom, the guide rods 40 are angled upwards relative to the orbit or the upper run 24, so that there is a run-on slope for the coarse material.

Das in den Aufnahmeräumen 16 verbleibende Feingut passiert den Abnehmerrechen 20 und wird an der in Transportrichtung nachgeordneten Umlenkrolle 28 ausgeworfen. Dies wird unterstützt durch die im Umlenkbereich sich vergrößernden Aufnahmeräume 16 (siehe Fig. 3) und durch auftretende Zentrifugalkräfte.The fine material remaining in the receiving spaces 16 passes through the pick-up rake 20 and is ejected at the deflection roller 28 downstream in the direction of transport. This is supported by the receiving spaces 16, which increase in size in the deflection area (see 3 ) and by occurring centrifugal forces.

Grundsätzlich müssen die Führungsstäbe 40 nicht in jede Lücke zwischen den Zähnen 38 eingreifen, so dass die Siebgröße variierbar bzw. auf eine gewünschte minimale Korngröße des Grobguts anpassbar ist. Denkbar ist es auch, dass die beiden Abnehmerrechen 20 voneinander unterschiedliche Siebgrößen besitzen und gegebenenfalls nicht in das Obertrum 24 eingreifen.In principle, the guide rods 40 do not have to engage in every gap between the teeth 38, so that the sieve size can be varied or adapted to a desired minimum grain size of the coarse material. It is also conceivable that the two pick-up rakes 20 have screen sizes that are different from one another and possibly do not engage in the upper run 24 .

Um das Gliederband zu realisieren, sind die aus Winkelprofilen gefertigten Mitnehmer 14 an einem Kettentrieb 42 fixiert, der über Zahnräder 44 auf den Umlenkrollen 28 läuft. Der Kettentrieb 42 umfasst zwei parallel umlaufende Ketten, mit deren Gliedern die Mitnehmer 14 an ihren Endabschnitten fest verbunden sind.In order to realize the link belt, the carriers 14 made of angle profiles are fixed to a chain drive 42 which runs on the deflection rollers 28 via gear wheels 44 . The chain drive 42 comprises two parallel circulating chains, with the links of which the drivers 14 are firmly connected at their end sections.

Fig. 4 zeigt ein Ausführungsbeispiel mit einer Siebmaschine 10 an einem Grablöffel 46. Die Siebmaschine 10 ist im Wesentlichen gleich aufgebaut wie die vorstehend beschriebene stationäre Variante. Damit wird ein kombiniertes Anbaugerät bzw. Arbeitswerkzeug für eine Erdbaumaschine, beispielsweise einen Bagger verwirklicht, so dass Grab- bzw. Aushub- und Siebarbeiten mobil verrichtet werden können. Zu diesem Zweck ist der Grablöffel 46 über eine Schnellwechseleinrichtung 48 mit dem freien Ende des Baggerstiels verbindbar. Weiterhin ist auf der oberen Begrenzungswand des Löffel 46 ein hydraulischer Schwenkantrieb 50 angeordnet, der eine Schwenkbewegung der Siebmaschine 10 gegen die Öffnung 52 des Löffels 46 erlaubt. Im geöffneten Zustand bei weggeschwenkter Siebmaschine 10 kann Erde abgegraben werden, während angeklappter Siebmaschine 10 das aufgenommenen Material ausgesiebt werden kann, wobei dann der Löffel 46 die Funktion des Aufgabetrichters 22 erfüllt. 4 shows an embodiment with a screening machine 10 on a digging bucket 46. The screening machine 10 is constructed essentially the same as the stationary variant described above. A combined attachment or working tool for an earth-moving machine, for example an excavator, is thus realized, so that digging or excavation and screening work can be carried out in a mobile manner. For this purpose, the digging bucket 46 can be connected to the free end of the excavator boom via a quick-change device 48 . Furthermore, a hydraulic pivoting drive 50 is arranged on the upper boundary wall of the bucket 46, which allows a pivoting movement of the screening machine 10 against the opening 52 of the bucket 46. In the open state with the screening machine 10 swiveled away, earth can be dug up, while the material picked up can be screened out when the screening machine 10 is folded in, with the spoon 46 then fulfilling the function of the feed hopper 22 .

In beiden vorstehend beschriebenen Ausführungsbeispielen wird die Siebmaschine 10 im Betrieb so orientiert, dass der Erdaushub bzw. das zu trennende Material unter Schwerkrafteinfluss auf das Obertrum 24 gelangt. Die Abstände der Mitnehmer 14 sind so bemessen, dass das Grobgut nicht in die Aufnahmeräume 16 eindringen kann, sondern auf den Mitnehmern 14 obenauf liegenbleibt. Das Feingut hingegen füllt die Aufnahmeräume 16 aus. Dabei wird durch den in der Transportbahn liegenden Tragschenkel der Mitnehmer 14 verhindert, dass das Feingut direkt durch das Obertrum 24 hindurchtreten kann. An dem oder den Abnehmerrechen 20 wird das Grobgut von den Mitnehmern 14 abgenommen, während das Feingut weitertransportiert und im Umlenkbereich ausgeworfen wird.In both exemplary embodiments described above, the screening machine 10 is oriented during operation in such a way that the excavated earth or the material to be separated reaches the upper run 24 under the influence of gravity. The distances between the drivers 14 are dimensioned in such a way that the coarse material cannot penetrate into the receiving spaces 16 but remains lying on top of the drivers 14 . On the other hand, the fine material fills the receiving spaces 16 . The carrying leg of the driver 14 lying in the transport path prevents the fine material from being able to pass directly through the upper run 24 . The coarse material is removed from the carriers 14 at the removal rake or rakes 20, while the fine material is transported further and ejected in the deflection area.

Claims (13)

  1. Screening machine for separating coarse and fine material from excavated soil, comprising an endlessly rotating conveyor (12) which can be loaded with the excavated soil and is driven by a motor (30) and has a large number of drivers (14) which rotate at a distance from one another, it being possible to transport the fine material into receiving chambers (16) between the drivers (14), and, at at least one separation point (18), a fixed removal rake (20) removing the coarse material from the drivers (14) passing through, the conveyor (12) having a receiving strand (24) which can be loaded with the excavated soil and a return strand (26), characterized in that the direction of rotation of the conveyor (12) is reversible, and in that a removal rake (20) having different retention sizes for the coarse material is arranged at each of the two ends of the receiving strand (24).
  2. Screening machine according to claim 1, characterized in that the drivers (14) are guided over a deflection roller (28) of the conveyor (12), which roller is arranged downstream of the removal rake (20), and in that the fine material can be ejected from the receiving chambers (16) at the deflection roller (28).
  3. Screening machine according to either claim 1 or claim 2, characterized in that a feed hopper (22) for the excavated soil is arranged on the conveyor (12).
  4. Screening machine according to any of claims 1 to 3, characterized in that the removal rake (20) forms a ramp slope for the coarse material, which slope is set at an angle to the orbit of the conveyor (12).
  5. Screening machine according to any of claims 1 to 4, characterized in that the removal rake (20) has a plurality of guide rods (40) which extend parallel to one another, the lateral spacing of the guide rods (40) from one another being adapted or being able to be adapted to a grain size of the coarse material.
  6. Screening machine according to any of claims 1 to 5, characterized in that the drivers (14) are designed as protruding links of a link belt of the conveyor (12).
  7. Screening machine according to any of claims 1 to 6, characterized in that the drivers (14) each comprise a toothed strip (36), the toothed strips (36) being aligned transversely to the orbit of the conveyor (12) and their teeth (38) pointing outward away from the orbit.
  8. Screening machine according to claim 7, characterized in that the removal rake engages in gaps between the teeth (38).
  9. Screening machine according to any of claims 1 to 8, characterized in that a breaking bar (32) for breaking up excavated material protruding over the drivers (14) is arranged at the separation point (18).
  10. Screening machine according to any of claims 1 to 9, characterized in that the motor (30), which operates hydraulically or electrically, is coupled to a deflection roller (28) of the conveyor (12).
  11. Attachment for an earth mover, in particular an excavator, comprising a digging bucket (46) and a screening machine (10) according to any of the preceding claims which is arranged on the digging bucket (46).
  12. Attachment according to claim 11, characterized in that the screening machine (10) can be pivoted against a bucket opening (52) of the digging bucket (46) by means of a pivoting device (50).
  13. Attachment according to claim 11, characterized in that the screening machine (10) is fixedly arranged in an open rear region of the digging bucket (46) opposite the bucket opening (52) of the digging bucket (46).
EP17767813.3A 2016-09-14 2017-09-12 Screening machine for separating coarse material and fine material from excavated earth Active EP3512644B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016117256.1A DE102016117256A1 (en) 2016-09-14 2016-09-14 Screening machine for separating coarse and fine material from excavated earth
PCT/EP2017/072899 WO2018050640A1 (en) 2016-09-14 2017-09-12 Screening machine for separating coarse material and fine material from excavated earth

Publications (2)

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EP3512644A1 EP3512644A1 (en) 2019-07-24
EP3512644B1 true EP3512644B1 (en) 2022-05-11

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EP (1) EP3512644B1 (en)
DE (1) DE102016117256A1 (en)
WO (1) WO2018050640A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111774288B (en) * 2020-07-15 2022-04-12 江苏辉通检测有限公司 Material receiving device of accelerated polishing machine
CN112720271B (en) * 2020-12-30 2023-03-24 台州市瑞达机械有限公司 Shot blasting machine for producing relay valve cover

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275380A (en) * 1926-06-23 1927-08-11 John Frederick Bishop Improvements in machines or methods of separating rubble, such as strings, straws, sticks and the like from grain or granular material
US2116006A (en) * 1936-06-17 1938-05-03 Thys Edouard Hop and stem separator
US3209911A (en) * 1962-06-13 1965-10-05 Speno International Separating conveyor
CH663909A5 (en) * 1984-09-14 1988-01-29 Willy Ag Maschf Appliance for breaking up, mixing and aerating humus, earth, peat etc. - comprises funnel above shredder belt revolving around 2 drums
NL9400975A (en) * 1994-06-15 1996-01-02 Busschers Metaalbedrijf Bv Sorting device
US6135290A (en) * 1998-06-05 2000-10-24 Rockland Manufacturing Company Sifter attachment for excavating machines and the like

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WO2018050640A1 (en) 2018-03-22
EP3512644A1 (en) 2019-07-24

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