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EP0216005B1 - Screening machine - Google Patents

Screening machine Download PDF

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Publication number
EP0216005B1
EP0216005B1 EP86105946A EP86105946A EP0216005B1 EP 0216005 B1 EP0216005 B1 EP 0216005B1 EP 86105946 A EP86105946 A EP 86105946A EP 86105946 A EP86105946 A EP 86105946A EP 0216005 B1 EP0216005 B1 EP 0216005B1
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EP
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Prior art keywords
screening
stack
decks
deck
screening machine
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EP86105946A
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German (de)
French (fr)
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EP0216005A3 (en
EP0216005A2 (en
Inventor
Ernst-Heinrich Dr.-Ing. Dressler
Frank Dr.-Ing. Puchalla
Hermann Rieschick
Götz Dr.-Ing. Kneschke
Helmut Tschiltschke
Hartmut Dipl.-Ing. Richter
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Berlin Brandenburg Academy of Sciences and Humanities
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Berlin Brandenburg Academy of Sciences and Humanities
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Priority to AT86105946T priority Critical patent/ATE70743T1/en
Publication of EP0216005A2 publication Critical patent/EP0216005A2/en
Publication of EP0216005A3 publication Critical patent/EP0216005A3/en
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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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens

Definitions

  • the invention relates to a screening machine system for a multi-deck screening machine, designed according to the throwing screening principle, for solving different classification tasks, preferably with separating cuts in the range from 5.0 mm to 0.04 mm, in a closed machine unit.
  • Screening machines are basically divided into throwing screens and plane screens according to their mode of operation.
  • sieve excitation takes place in a component perpendicular to the sieve plane.
  • Flat sieves vibrate in the sieve plane.
  • H. Schubert contains more detailed information on this: Preparation of solid mineral raw materials, Vol. I, VEB German publisher for basic material industry, Leipzig, 3rd edition.
  • Multi-deck screening machines designed as throwing screens are already known. They differ mainly in the type of sieve excitation described above. less in the number of screen decks available. In general, one to a maximum of four-deck screens are offered and used, so that up to 5 grain size classes can be obtained.
  • the limitation of the number of sieve decks is justified by the fact that the sieving capacity decreases with decreasing grain size or mesh size and thus the sieving machine throughput after the sieving capacity of the finest screen must be set.
  • One representative is the Regula cantilever chair from J. Engelsmann AG, FRG, designed as a flat screen, for a classification of, for example, 8 grain size classes, in which the screen decks are not arranged one above the other.
  • Several sieve levels can be arranged vertically in a frame, separated from each other.
  • the disadvantage of this screening machine is that it requires a large amount of space and space.
  • a typical multi-deck sieving machine based on the principle of the plan sieve is the plan classifier for classifying flour into different quality classes.
  • Vibrating rotary screens are also known as multi-deck screening machines, in which the movement of plane and throwing screens is combined. A representative of this is the vibration separator from FBLehmann Maschinenfabrik GmbH, FRG. It performs three-dimensional sieving movements over 2 flywheels and a spring ring and generates up to 5 grain size classes in one machine.
  • a similar machine type is the wobble screening machine, for example from Allgaier-Werke GmbH, FRG, usually with 3 screening decks and 4 grain size classes.
  • the disadvantage of the vibratory round screens is their small available screen area of a maximum of 5 - 6 m2 per screen deck.
  • All of the multi-deck screening machines mentioned have the common disadvantage that the material to be screened is given up via a central task and accordingly its grain size distribution density and the sieve mesh sizes placed on it, in which the sieve surface occupancy of individual sieve decks is overloaded or underloaded and thus the sieving quality or the selectivity of the classification product is impaired.
  • the throwing sieve principle in a multi-deck screening machine reaches its performance limits if, as already described, too high or too low screening surface occupancy occurs on individual screening decks, which leads to losses in the screening quality or the selectivity of the classification process.
  • Obtaining a large number of grain size classes, for example more than 10 in a multi-deck sieving machine leads to losses in throughput and sieving quality in the event of changes in the grain size distribution of a sieving material, ie the sieving machine is underutilized and brings additional quality losses.
  • FIG. 1 shows a cross section through the entire sieve stack of a sieve machine system developed on the basis of a multi-deck sieving machine according to DD 151 882 or EP 028 792, consisting of pre-sieve stack 1, return element 5 and post-sieve stack 4, the sieve stack being longitudinally divided in the middle.
  • the entire stack of sieves is firmly clamped to a multi-deck sieving machine in a vibration-stable and dust-tight manner by means of a steel cable bracing.
  • the feed material is broken down into 5 grain groups:> 63 mm; 0.63 - 0.4 mm; 0.4-0.25mm; 0.25 - 0.16 mm and ⁇ 0.16 mm. Both screen halves are thus covered with the same screen mesh.
  • the grain groups are transported from the discharge side to the feed side opposite to the sieve excitation. It can be seen from FIG. 1 that 2 to 3 grit groups are combined with one another on the right and left half of the sieve.
  • the mesh sizes are 2 mm on the right half of the sieve; 1.6 mm; 1.25 mm; 1 mm; 0.8 mm; 0.63 mm; 0.5 mm and 0.4 mm and the mesh width 0.315 mm on the left half of the sieve; 0.25 mm; 0.2 mm; 0.16 mm; 0.125 mm; 0.1 mm; 0.08mm and 0.063mm.
  • the black arrows indicate the transfer points of grit groups from the feedthroughs to the screen decks of the after-sieve stack 4.
  • the screening machine system is basically the same as in the first, however, the material to be screened is sorted in the following order: pre-screening stacks, return elements, post-screening stacks.
  • the grain size distribution density of the feed material can be matched very precisely to the separation area assignment of the respective mesh sizes and relatively free sieve areas.

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Abstract

The invention relates to a screening machine for a multi-deck screening machine, designed according to the throw-type screening principle, for carrying out different screening tasks in a closed machine unit. The screening machine system according to the invention consists of the zones: prescreening stack, main screening stack, partial screening stack, secondary screening stack and return element which are mutually interchangeable and replaceable and can be combined to form system solutions.

Description

Die Erfindung bezieht sich auf ein Siebmaschinensystem für eine Mehrdecksiebmaschine, ausgelegt nach dem Wurfsiebprinzip, zur Lösung unterschiedlicher Klassieraufgaben, vorzugsweise mit Trennschnitten im Bereich von 5,0 mm bis 0,04 mm, in einer geschlossenen Maschineneinheit.The invention relates to a screening machine system for a multi-deck screening machine, designed according to the throwing screening principle, for solving different classification tasks, preferably with separating cuts in the range from 5.0 mm to 0.04 mm, in a closed machine unit.

Siebmaschinen werden nach ihrer Funktionsweise grundsätzlich in Wurfsiebe und Plansiebe unterteilt. Bei den Wurfsieben erfolgt die Sieberregung in einer senkrechten Komponente zur Siebebene wurfartig. Plansiebe schwingen in der Siebebene. Nähere Ausführungen dazu enthält H. Schubert: Aufbereitung fester mineralischer Rohstoffe, Bd. I, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig, 3. Auflage.
Als Wurfsieb ausgelegte Mehrdecksiebmaschinen sind bereits bekannt. Sie unterscheiden sich hauptsächlich in der oben beschriebenen Art der Sieberregung. weniger in der Zahl der zur Verfügung stehenden Siebdecks. Allgemein werden Ein- bis höchstens Vierdecksiebe angeboten und verwendet, so daß bis zu 5 Korngrößenklassen gewonnen werden können. Die Begrenzung der Zahl der Siebdecks wird damit begründet, daß mit abnehmender Korngröße bzw. Maschenweite die Siebleistung zurückgeht und damit der Siebmaschinendurchsatz nach der Siebleistung des feinsten Siebbelages eingestellt werden muß.
Ein Vertreter ist dafür der als Plansieb ausgelegte Regula-Freischwinger der Firma J. Engelsmann AG, BRD, für eine Klassierung von beispielsweise 8 Korngrößenklassen, bei dem die Siebdecks nicht übereinander angeordnet sind. In einem Rahmen können mehrere Siebebenen, untereinander getrennt, vertikal angeordnet werden. Der Nachteil dieser Siebmaschine besteht in einem großen Flächen- und Raumbedarf. Eine typische Mehrdecksiebmaschine nach dem Plansiebprinzip ist der Plansichter zur Klassierung von Mehl in verschiedene Qualitätsklassen. Er besteht aus einem Spannrahmen, in dem Kastensiebe und Distanzkammern eingespannt sind. Je nach der Fließfähigkeit des Siebgutes wird der Siebstapel geneigt, um eine Siebgutbewegung von der Einlauf- zur Austragsseite zu erreichen. Durch das Plansiebprinzip ist nur eine begrenzte Produktgruppe ausreichend gut klassierbar. Weiterhin sind Vibrationsrundsiebe als Mehrdecksiebmaschinen bekennt, in denen die Bewegung von Plan- und Wurfsieb vereinigt ist. Ein Vertreter davon ist der Vibrationsseparator der Firma F.B.Lehmann Maschinenfabrik GmbH, BRD. Er führt dreidimensionale Siebbewegungen über 2 Schwungmassen und einen Federkranz aus und erzeugt bis 5 Korngrößenklassen in einer Maschine. Ein ähnlicher Maschinentyp ist die Taumelsiebmaschine, beispielsweise der Firma Allgaier-Werke GmbH, BRD, üblicherweise mit 3 Siebdecks und 4 Korngrößenklassen. Der Nachteil der Vibrationsrundsiebe ist ihre kleine verfügbare Siebfläche von maximal 5 - 6 m² pro Siebdeck.
Alle die genannten Mehrdecksiebmaschinen haben den gemeinsamen Nachteil, daß über eine zentrale Aufgabe das Siebgut aufgegeben wird und entsprechend seiner Korngrößenverteilungsdichte und den aufgelegten Siebmaschenweiten eine Klassierung stattfindet, bei der die Siebflächenbelegung einzelner Siebdecks über- oder unterbelastet wird und damit die Siebgüte bzw. die Trennschärfe des Klassierproduktes beeinträchtigt wird.
In der Patentschrift DD 151 882 bzw. EP 0 028 792 wird eine als Wurfsieb ausgelegte Mehrdecksiebmaschine beschrieben, die mit besonderen konstruktiven Merkmalen, wie steiler Sieberregung zwischen 45o bis 85o (Wurfwinkel) und einem Rückführelement ausgezeichnet ist. Damit sind neue Konstruktionselemente im Siebmaschinenbau eingeführt worden, durch die es gelingt, das Siebgut in einer Rückführung entgegen der Transportrichtung erneut zur Aufgabeseite zu fördern und bei einer Vielzahl von Korngrößenklassen eine größere Trennschärfe zu ermöglichen.
Es ist aber mit der Entwicklung von Konstruktionselementen noch nicht gelungen, neue Siebmaschinensysteme auf ihrer Basis aufzubauen, mit denen unterschiedlichste Siebprobleme möglichat in einer Maschineneinheit wirtschaftlich gelöst werden können. Das Wurfsiebprinzip in einer Mehrdecksiebmaschine stößt an Leistungsgrenzen, wenn, wie bereits vorher beschrieben, eine zu hohe oder zu niedrige Siebflächenbelegung auf einzelnen Siebdecks auftritt, die zu Verlusten in der Siebgüte bzw. der Trennschärfe des Klassierprozesses führt. Die Gewinnung einer Vielzahl von Korngrößenklassen, beispielsweise über 10 in einer Mehrdecksiebmaschine, führt bei Veränderungen in der Korngrößenverteilung eines Siebgutes zu Verlusten im Durchsatz und in der Siebgüte, d.h. die Siebmaschine ist nicht ausgelastet und bringt zusätzlich Qualitätsverluste mit sich.Screening machines are basically divided into throwing screens and plane screens according to their mode of operation. In the case of the throwing sieves, sieve excitation takes place in a component perpendicular to the sieve plane. Flat sieves vibrate in the sieve plane. H. Schubert contains more detailed information on this: Preparation of solid mineral raw materials, Vol. I, VEB German publisher for basic material industry, Leipzig, 3rd edition.
Multi-deck screening machines designed as throwing screens are already known. They differ mainly in the type of sieve excitation described above. less in the number of screen decks available. In general, one to a maximum of four-deck screens are offered and used, so that up to 5 grain size classes can be obtained. The limitation of the number of sieve decks is justified by the fact that the sieving capacity decreases with decreasing grain size or mesh size and thus the sieving machine throughput after the sieving capacity of the finest screen must be set.
One representative is the Regula cantilever chair from J. Engelsmann AG, FRG, designed as a flat screen, for a classification of, for example, 8 grain size classes, in which the screen decks are not arranged one above the other. Several sieve levels can be arranged vertically in a frame, separated from each other. The disadvantage of this screening machine is that it requires a large amount of space and space. A typical multi-deck sieving machine based on the principle of the plan sieve is the plan classifier for classifying flour into different quality classes. It consists of a stenter frame in which box sieves and spacing chambers are clamped. Depending on the flowability of the material to be sieved, the sieve stack is inclined in order to achieve a movement of the material to be sieved from the inlet to the discharge side. Due to the layout screen principle, only a limited product group can be classified sufficiently well. Vibrating rotary screens are also known as multi-deck screening machines, in which the movement of plane and throwing screens is combined. A representative of this is the vibration separator from FBLehmann Maschinenfabrik GmbH, FRG. It performs three-dimensional sieving movements over 2 flywheels and a spring ring and generates up to 5 grain size classes in one machine. A similar machine type is the wobble screening machine, for example from Allgaier-Werke GmbH, FRG, usually with 3 screening decks and 4 grain size classes. The disadvantage of the vibratory round screens is their small available screen area of a maximum of 5 - 6 m² per screen deck.
All of the multi-deck screening machines mentioned have the common disadvantage that the material to be screened is given up via a central task and accordingly its grain size distribution density and the sieve mesh sizes placed on it, in which the sieve surface occupancy of individual sieve decks is overloaded or underloaded and thus the sieving quality or the selectivity of the classification product is impaired.
In the patent specification DD 151 882 and EP 0,028,792 describes a multiple-deck designed as a throwing screen which is excellent o with special design features, such as a steep impulse Sieber between 45 to 85 o (throwing angle) and a feedback element. This means that new construction elements have been introduced in the construction of screening machines, through which the material to be screened can be conveyed back to the feed side in a return direction opposite to the direction of transport, and which enables a greater degree of selectivity for a large number of grain size classes.
However, with the development of construction elements, it has not yet been possible to build new screening machine systems based on them, with which a wide variety of screening problems can be solved economically in one machine unit. The throwing sieve principle in a multi-deck screening machine reaches its performance limits if, as already described, too high or too low screening surface occupancy occurs on individual screening decks, which leads to losses in the screening quality or the selectivity of the classification process. Obtaining a large number of grain size classes, for example more than 10 in a multi-deck sieving machine, leads to losses in throughput and sieving quality in the event of changes in the grain size distribution of a sieving material, ie the sieving machine is underutilized and brings additional quality losses.

Die Erfindung hat die Aufgabe, ein Siebmaschinensystem auf der Basis einer nach dem Wurfsiebprinzip arbeitenden Mehrdecksiebmaschine zu entwickeln, mit deren Hilfe Klassieraufgaben in einer einzelnen Maschineneinheit gelöst werden,wenn das Aufgabegut produktionsbedingt in seiner Kornzusammensetzung wechselt, wenn unterschiedliche Siebgüter mit unterschiedlicher Dichte oder Kornform zu klassieren sind oder wenn aus einem Aufgabegut ohne Rücksicht auf dessen Kornverteilung bedarfsgerechte Körnungen zu erzeugen sind. Es ist weiterhin Aufgabe der Erfindung, mit dem Siebmaschinensystem eine gleichmäßige Siebflächenbelegung unter Berücksichtigung der Korngrößenverteilungsdichte des Aufgabegutes, der jeweiligen Maschenweite und der zugehörigen relativ freien Siebfläche zu erreichen.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Siebstapel einer nach dem Wurfsiebprinzip ausgebildeten Mehrdecksiebmaschine aus den Zonen:
Vorsiebstapel, Hauptsiebstapel, Teilsiebstapel, Nachsiebstapel und Rückführelement besteht, die gegenseitig austauschbar und ersetzbar sind und zu den Systemlösungen

  • Mehrdecksiebmaschine mit einem Vorsiebstapel, Rückführelement und Nachsiebstapel;
  • Mehrdecksiebmaschine mit Vorsiebstapel, Rückführelementen und Nachsiebstapeln;
zusammensetzbar sind.
Für dieses Siebmaschinensystem ist weiterhin erfindungswesentlich, daß, bis auf das Rückführelement, jede Zone mindestens aus einem Siebdeck und einem Blinddeck und im System einer Mehrdecksiebmaschine mit einem Hauptsiebstapel dieser aus mindestens fünf Siebdecks und einem Blinddeck besteht, daß die Sieb- und Blinddecks längsgeteilt und in ihrem Rahmenprofil untereinander stapelbar und gegenseitig abgedichtet sind und daß diese beiden Deckarten an ihrer Einlauf- und Auslaufseite Durchführungen für das Siebgut enthalten, um damit eine Siebgutverteilung innerhalb der Siebmaschine sowie eine Abführung des Siebgutes aus der Siebmaschine zu gewährleisten. Im Fall des Systems mit einem Hauptsiebstapel sind auf mindestens einem Siebdeck beiderseits unterschiedliche Maschenweiten bzw. Siebgewebe aufgelegt.
Die Aufgabe des Rückführelements ist dabei die Förderung des Siebgutes entgegen der Förderrichtung für eine erneute Wiederholung des Siebvorganges zur Einlauf- bzw. Aufgabeseite innerhalb der Siebmaschine. Der Siebstapel, bestehend aus Siebdecks, Blinddecks und, je nach Wahl des Siebsystems, Rückführelementen, wird in einem Schwingungsrahmen mittels eines Stahlseiles oder Spannschrauben schwingungsstabil und staubdicht verspannt.
Als erfindungswesentlich hat sich weiterhin erwiesen, daß die Siebdecks im Unterboden Siebhilfen enthalten. Bei dem Siebmaschinensystem Vorsiebstapel - Rückführelement - Nachsiebstapel wird im Vorsiebstapel das Aufgabegut in größere Kornklassenbereiche (Körnungsgruppen) vorklassiert, um nach der Rückführung im Nachsiebstapel entsprechend dem Klassierverhalten der Siebgüter und deren Korngrößenverteilungsdichte eine optimale Siebflächenbelegung zu erreichen. Mit der zusätzlichen Längsteilung der Siebdecks ist eine weitere Anpassung an die verschiedensten Siebaufgaben gegeben. Dieses Siebmaschinensystem gilt für die Erzeugung einer Vielzahl von Korngrößenklassen.
Bei dem Siebmaschinensystem mit mehreren Teilsiebstapeln sind parallel laufende gleiche Siebvorgänge mit dem Ziel der Erzeugung weniger Korngrößenklassen bei hohem Durchsatz in einer einzelnen Mehrdecksiebmaschine möglich. Bei dem Siebmaschinensystem mit einem Hauptsiebstapel, bestehend aus mindestens 5 Siebdecks und einem Blinddeck wird das Aufgabegut so über die einzelnen Siebdecks geführt, daß für bestimmte Fraktionen, die in dem Aufgabegut angereichert sind, mehr Siebfläche zur Verfügung steht. Auch hier erweist sich die Längsteilung der Siebdecks für eine Anpassung an die korngrößenverteilungsdichte des Aufgabegutes als sehr positiv, da rechts- und linksseitig unterschiedliche Maschenweiten aufgelegt werden können.
Mit dem vorgeschlagenen Siebmaschinensystem auf der Basis einer Mehrdecksiebmaschine können in einer einzelnen Maschineneinheit die aufgabegemäßen Stoffe in hoher Trennschärfe bei niedrigem Raumbedarf, niedrigen Invest- und Unterhaltungskosten und geringem Entstaubungsaufwand klassiert werden. Nachfolgend wird die Erfindung anhand von 2 Ausführungsbeispielen näher erläutert.The object of the invention is to develop a screening machine system on the basis of a multi-deck screening machine working according to the throwing screening principle, with the aid of which classification tasks are solved in a single machine unit when the feed material changes in its grain composition due to production, when classifying different screenings with different densities or grain shapes or if grain needs to be produced from a feed material regardless of its grain size distribution. It is a further object of the invention to achieve a uniform sieve surface coverage with the sieve machine system, taking into account the grain size distribution density of the feed material, the respective mesh size and the associated relatively free sieve surface.
This object is achieved in that the sieve stack of a multi-deck sieve machine designed according to the throwing sieve principle from the zones:
Pre-sieve stacks, main sieve stacks, partial sieve stacks, post-sieve stacks and return elements exist which are mutually interchangeable and replaceable and are part of the system solutions
  • Multi-deck screening machine with a pre-screen stack, return element and post-screen stack;
  • Multi-deck screening machine with pre-screening stacks, return elements and post-screening stacks;
can be put together.
For this screening machine system, it is also essential to the invention that, apart from the return element, each zone consists of at least one screening deck and one blind deck, and in the system of a multi-deck screening machine with a main screening stack this comprises at least five Sieve decks and a blind deck consist of the sieve and blind decks being longitudinally divided and stackable and mutually sealed in their frame profile, and that these two types of deck contain feed-throughs for the material to be sieved on their inlet and outlet sides in order to distribute the material to be sieved within the sieving machine and to remove it ensure the material to be screened from the screening machine. In the case of the system with a main sieve stack, different mesh sizes or sieve fabrics are placed on both sides of at least one sieve deck.
The task of the return element is to convey the material to be screened against the direction of conveyance for a repeated repetition of the screening process to the inlet or feed side within the screening machine. The sieve stack, consisting of sieve decks, blind decks and, depending on the selection of the sieve system, feedback elements, is clamped in a vibration frame by means of a steel cable or tensioning screws in a vibration-stable and dust-tight manner.
It has also proven to be essential to the invention that the screen decks contain screening aids in the underbody. With the screening machine system pre-screening stack - return element - post-screening stack, the feed material is pre-classified into larger grain class areas (grit groups) in order to achieve an optimal sieve area allocation after the return in the post-screening stack according to the classification behavior of the screenings and their grain size distribution density. With the additional longitudinal division of the screen decks, further adaptation to a wide variety of screening tasks is possible. This screening machine system applies to the production of a large number of grain size classes.
In the screening machine system with several partial screening stacks, the same screening processes running in parallel are included the goal of producing fewer grain size classes with high throughput in a single multi-deck screening machine. In the screening machine system with a main screen stack consisting of at least 5 screen decks and a blind deck, the feed material is guided over the individual screen decks in such a way that more screen area is available for certain fractions that are enriched in the feed material. Here, too, the longitudinal division of the screen decks proves to be very positive for adaptation to the grain size distribution density of the feed material, since different mesh sizes can be applied on the right and left sides.
With the proposed screening machine system based on a multi-deck screening machine, the materials according to the task can be classified in a single machine unit with high selectivity with low space requirements, low investment and maintenance costs and low dedusting effort. The invention is explained in more detail below on the basis of two exemplary embodiments.

Figur 1 zeigt einen Querschnitt durch den gesamten Siebstapel eines auf der Basis einer Mehrdecksiebmaschine nach DD 151 882 bzw. EP 028 792 entwickelten Siebmaschinensystems, bestehend aus Vorsiebstapel 1, Rückführelement 5 und Nachsiebstapel 4, wobei der Siebstapel in der Mitte längsgeteilt ist. Der gesamte Siebstapel wird durch eine Stahlseilverspannung schwingungsstabil und staubdicht im Schwingungsrahmen fest zu einer Mehrdecksiebmaschine verspannt. Im Vorsiebstapel 1, der aus 4 Siebdecks und 1 Blinddeck besteht, wird das Aufgabegut in 5 Körnungsgruppen zerlegt: >63 mm; 0,63 - 0,4 mm; 0,4 - 0,25 mm; 0,25 - 0,16 mm und <0,16 mm. Damit sind beide Siebhälften mit gleichen Siebmaschen belegt. Im Rückführelement 5 werden die Körnungsgruppen von der Austragsseite zur Aufgabeseite entgegengesetzt der Sieberregung transportiert. Dabei ist aus der Figur 1 zu entnehmen, daß jeweils 2 bis 3 Körnungsgruppen auf der rechten bzw. linken Siebhälfte miteinander vereinigt werden. Im Nachsiebstapel 4 sind auf der rechten Siebhälfte die Maschenweiten 2 mm; 1,6 mm; 1,25 mm; 1 mm; 0,8 mm; 0,63 mm; 0,5 mm und 0,4 mm aufgelegt und auf der linken Siebhälfte die Maschenweiten 0,315 mm; 0,25 mm; 0,2 mm; 0,16 mm; 0,125 mm; 0,1 mm; 0,08 mm und 0,063 mm. Durch die schwarzen Pfeile werden die Überführungsstellen von Körnungsgruppen aus den Durchführungen auf die Siebdecks des Nachsiebstapels 4 gekennzeichnet. Mit der Festlegung der Trennschnitte im Vorsiebstapel 1 und der Aufteilung der Körnungsgruppen im Nachsiebstapel 4 mit seiner zusätzlichen Unterteilung in eine rechte und eine linke Seite wird die gute Anpassung an sehr unterschiedliche Siebgüter unter Berücksichtigung der Korngrößenverteilungsdichte des Aufgabegutes, der jeweiligen Maschenweite und der zugehörigen relativen freien Siebfläche sichtbar, wodurch die notwendige gleichmäßige Siebflächenbelegung erreicht wird.
Als effektiv haben sich nach Anbringen eines Unterbodens mit grobem Siebgewebe Siebhilfen in Form von Gummi- oder Holzkugeln zur Verhinderung des Erblindens der Siebdecks mit feinen Maschenweiten erwiesen. Der Siebstapel wird mittels Spannschrauben fest mit dem Schwingungsrahmen verspannt.FIG. 1 shows a cross section through the entire sieve stack of a sieve machine system developed on the basis of a multi-deck sieving machine according to DD 151 882 or EP 028 792, consisting of pre-sieve stack 1, return element 5 and post-sieve stack 4, the sieve stack being longitudinally divided in the middle. The entire stack of sieves is firmly clamped to a multi-deck sieving machine in a vibration-stable and dust-tight manner by means of a steel cable bracing. In the pre-sieve stack 1, which consists of 4 sieve decks and 1 blind deck, the feed material is broken down into 5 grain groups:> 63 mm; 0.63 - 0.4 mm; 0.4-0.25mm; 0.25 - 0.16 mm and <0.16 mm. Both screen halves are thus covered with the same screen mesh. Be in the return element 5 the grain groups are transported from the discharge side to the feed side opposite to the sieve excitation. It can be seen from FIG. 1 that 2 to 3 grit groups are combined with one another on the right and left half of the sieve. In the after-sieve stack 4, the mesh sizes are 2 mm on the right half of the sieve; 1.6 mm; 1.25 mm; 1 mm; 0.8 mm; 0.63 mm; 0.5 mm and 0.4 mm and the mesh width 0.315 mm on the left half of the sieve; 0.25 mm; 0.2 mm; 0.16 mm; 0.125 mm; 0.1 mm; 0.08mm and 0.063mm. The black arrows indicate the transfer points of grit groups from the feedthroughs to the screen decks of the after-sieve stack 4. With the definition of the separating cuts in the pre-sieve stack 1 and the division of the grain groups in the post-sieve stack 4 with its additional subdivision into a right and a left side, the good adaptation to very different sieving materials is taken into account, taking into account the grain size distribution density of the feed material, the respective mesh size and the associated relative free Sieve area visible, which ensures the necessary uniform sieve area coverage.
Screening aids in the form of rubber or wooden balls have proven to be effective after the installation of a sub-floor with coarse screen fabric to prevent the screen decks from going blind with fine mesh sizes. The sieve stack is firmly clamped to the vibration frame by means of clamping screws.

Beim zweiten Ausführungsweg ist das Siebmaschinensystem prinzipiell wie im ersten ausgeführt, jedoch erfolgt die Trennung des Siebgutes in der Reihenfolge: Vorsiebstapel, Rückführelemente, Nachsiebstapeln. Auch hier gelingt sehr genau eine Abstimmung der Korngrößenverteilungsdichte des Aufgabegutes auf die Trennflächenbelegung der jeweiligen Maschenweiten und relativ freien Siebflächen.In the second embodiment, the screening machine system is basically the same as in the first, however, the material to be screened is sorted in the following order: pre-screening stacks, return elements, post-screening stacks. Here, too, the grain size distribution density of the feed material can be matched very precisely to the separation area assignment of the respective mesh sizes and relatively free sieve areas.

Claims (7)

  1. Screening machine system, designed as a multi-deck screening machine based on the shaking screen principle, having screening decks, blind decks and return elements braced as a screening stack in swing frames and having a vibration exciter disposed on the screening stack, characterised in that the screening stack comprises the zones: primary screening stack (1), main screening stack (2), partial screening stack (3), rescreening stack (4) and return element (5), which are interchangeable and replaceable one with the other and may be combined to form the system solutions of
    - a multi-deck screening machine having a primary screening stack (1), a return element (5) and a rescreening stack (4);
    - a multi-deck screening machine having a primary screening stack (1), return elements (5) and rescreening stacks (4).
  2. Screening machine system according to patent claim 1, characterised in that down to the return element each zone comprises at least one screening deck and one blind deck and, in the system having a main screening stack, the latter comprises at least five screening decks and one blind deck.
  3. Screening machine system according to patent claims 1 and 2, characterised in that the screening decks and blind decks are longitudinally slit and, in the system of the main screening stack, meshes or screen nettings which mutually differ are placed on at least one screening deck.
  4. Screening machine system according to patent claims 1 to 3, characterised in that the screening decks and blind decks in their frame profile are stackable one on top of the other and are sealed off one from the other.
  5. Screening machine system according to patent claims 1 to 4, characterised in that the screening decks and blind decks include lead-through openings for the screened substance on their inlet and outlet sides.
  6. Screening machine system according to patent claim 1, characterised in that the screening stack is braced in the swing frame in a vibrationally stable and dust-tight manner by means of a steel cable or tightening screws.
  7. Screening machine system according to patent claim 1, characterised in that the screening decks contain screening aids in their floor.
EP86105946A 1985-09-23 1986-04-30 Screening machine Expired - Lifetime EP0216005B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86105946T ATE70743T1 (en) 1985-09-23 1986-04-30 SCREENING SYSTEM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD85280888A DD256227A3 (en) 1985-09-23 1985-09-23 type of screen
DD280888 1985-09-23

Publications (3)

Publication Number Publication Date
EP0216005A2 EP0216005A2 (en) 1987-04-01
EP0216005A3 EP0216005A3 (en) 1988-10-12
EP0216005B1 true EP0216005B1 (en) 1991-12-27

Family

ID=5571487

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Application Number Title Priority Date Filing Date
EP86105946A Expired - Lifetime EP0216005B1 (en) 1985-09-23 1986-04-30 Screening machine

Country Status (5)

Country Link
EP (1) EP0216005B1 (en)
JP (1) JPS6268575A (en)
AT (1) ATE70743T1 (en)
DD (1) DD256227A3 (en)
DE (1) DE3683110D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101516531B (en) 2006-09-25 2014-05-21 巴斯夫欧洲公司 Method for grading water-absorbent polymer particles
GB2444996A (en) * 2006-11-22 2008-06-25 Toshiba Res Europ Ltd Inter-Relay Interference Avoidance in a Wireless Communications Network

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD151882A1 (en) * 1979-11-08 1981-11-11 Dressler Ernst Heinrich multi deck
JPS61138574A (en) * 1984-12-11 1986-06-26 株式会社　サタケ Spiral conveyor for vertical type selector

Also Published As

Publication number Publication date
DD256227A3 (en) 1988-05-04
DE3683110D1 (en) 1992-02-06
ATE70743T1 (en) 1992-01-15
EP0216005A3 (en) 1988-10-12
JPS6268575A (en) 1987-03-28
EP0216005A2 (en) 1987-04-01

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