EP0325253B1 - Drum screen - Google Patents

Drum screen Download PDF

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Publication number
EP0325253B1
EP0325253B1 EP89100889A EP89100889A EP0325253B1 EP 0325253 B1 EP0325253 B1 EP 0325253B1 EP 89100889 A EP89100889 A EP 89100889A EP 89100889 A EP89100889 A EP 89100889A EP 0325253 B1 EP0325253 B1 EP 0325253B1
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EP
European Patent Office
Prior art keywords
drum
annular
annular screen
section member
screening
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89100889A
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German (de)
French (fr)
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EP0325253A3 (en
EP0325253A2 (en
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LT LINNHOFF MASCHINENBAU GmbH
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LT LINNHOFF MASCHINENBAU GmbH
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Priority to AT89100889T priority Critical patent/ATE77977T1/en
Publication of EP0325253A2 publication Critical patent/EP0325253A2/en
Publication of EP0325253A3 publication Critical patent/EP0325253A3/en
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Publication of EP0325253B1 publication Critical patent/EP0325253B1/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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • 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
    • B07B1/18—Drum screens
    • B07B1/185—Drum screens provided with exchangeable sieve panels

Definitions

  • the invention relates to a screening drum according to the preamble of claim 1.
  • Such screening drums are known (EP-A-0.131.162) and are used, for example, to prepare the material of road surfaces using bitumen or on asphalt and grit of different grain sizes. Coarse grit grit is used to build a support structure, smaller grit grit is used to partially fill the cavities of the support structure and the bitumen penetrating into the remaining cavities is used to bind the other covering components.
  • a generic screening drum can be used to bring the individual components into the correct mixing ratio and, in particular, to prepare them by tempering in the heated mixing drum if the individual components of the road surface are to be applied to the road base at the same time.
  • the object of the invention is to design a generic device such that the individual ring screen sections can be assigned to the drum in a particularly expedient manner.
  • a "possible as possible” is understood in particular that the ring screen sections can be assembled and disassembled as quickly as possible and with a minimum of tooling, and that the assembled ring screens are reliably assigned to the drum in the assembled state.
  • the preparation of the mixed material is also to be improved, and the solution to this subtask is to arrange the entire drum including the sieves with the longitudinal axis inclined towards the horizontal.
  • a drum 2 with the longitudinal axis 3 is rotatably mounted about this longitudinal axis in a fixed housing 1.
  • a burner 4 whose longitudinal flame axis coincides with the longitudinal drum axis 3, projects into the drum 2 from the drum end shown on the left in the illustration.
  • the burner can basically be of any type and can be operated with gas or oil.
  • the drum 2 is driven by a motor (not shown) via a gear unit which includes a race 5 surrounding the drum and firmly connected to it.
  • a plurality of so-called hot silos 6 are arranged one after the other in the longitudinal direction of the drum on the housing 1.
  • These hot silos are funnel-shaped containers that are largely insulated from temperature radiation, which receive chips of different particle sizes emerging from the drum 1 mixed with bitumen or asphalt and place them on a conveyor belt for further processing.
  • circular screens 7 are arranged in succession in the longitudinal direction of the drum on the drum 2 such that an annular space 8 exists between the jacket of the drum 2 and the circular screens 7.
  • the circular sieves have different mesh sizes, the circular sieve 7a with the largest mesh size being on the right in the drawing, the circular sieve 7d with the smallest mesh size being on the left end of the drum 2 in the drawing.
  • the annular space 8 communicates with the interior of the drum 2 via openings 9 which are evenly distributed over the drum circumference at the drum end on the left in the drawing.
  • the dust and moisture is discharged through an exhaust stack 19 at the drum end of the feed device.
  • the central circular sieves 7 are attached to the drum 2 in accordance with the invention as shown in FIGS. 2-4.
  • Spacer pairs 22, 23 are arranged in the areas on both sides of the plane 21, which essentially determine the gap width between the drum 2 and the circular screens 7.
  • the spacer pairs 22, 23 are evenly distributed over the circumference of the drum 2 while maintaining large distances.
  • Each spacer 22 or 23 is an extruded profile running in the longitudinal direction of the drum with a U-shaped cross-section, the spacers of each pair of spacers following one another with their back 24 facing away from one another and with their radially inner flanges 25, while maintaining a relatively small distance in the circumferential direction of the drum are attached to the drum 2.
  • the length of each spacer (extruded profile) 22 or 23 corresponds approximately to the length of one of the circular screens 7.
  • a screen support 26 is arranged, which is an extruded profile with a flat cross section, which runs in the circumferential direction of the drum, the contour of which follows and at one end with the "one” and at the other end is firmly connected, in particular welded, to the "other" of the above-mentioned paired spacers which are U-shaped in cross section.
  • the circular sieves rest on the top of these flat sieve supports, which are rectangular in cross section, and on the outer flanges 25a of the spacers 22, 23.
  • each tension band is a spring steel strip which runs in the circumferential direction of the drum 2, and the length of which can be adjusted with a turnbuckle between its two ends so that the respective round screen end is held without play between the associated tension band and the associated sieve support.
  • angular holding means 28 are distributed in the initial state.
  • the horizontal leg 28a of the respective holding means is firmly connected to the tightening strap 27, for example welded.
  • the other leg 28b is directed radially outwards as a flange-like section and can be functionally regarded as part of the ring sieves after the tensioning band 27 has been applied and tightened.
  • This extruded profile 29 is firmly connected to the screen supports on its two sides, in particular welded to them.
  • the spacers 22, 23 are welded to the drum 2, the sieve supports 26 are welded to them, and the extruded profiles 29 are welded to them.
  • the drum 2 prepared in this way is now on both sides of an extruded profile 29 or between two in Drum longitudinal direction successive extruded profiles 29 inserted one of the rotary screens.
  • the tensioning band 27 with the holding means 28 is pulled up and down at each end of the respective screen.
  • the radially outwardly directed legs of the holding means 28 rest against the sides of the extruded profiles 29 without any play.
  • the material of the holding means 28 now allows the ends of the radially outwardly directed legs 28a (FIG.
  • the sieve drum in its entirety is inclined relative to the horizontal 30 in such a way that there is an angle ⁇ of approximately 4 ° between it and the longitudinal drum 3 such that the discharge end is higher than the end of the feed with the feed device 10.
  • This measure favors the Mixing of goods by increasing the length of time the goods stay in the drum and giving the goods a radial movement component.
  • a multi-start screw 31 is arranged in the annular space between the drum and the screen or the successive screen sections of different mesh sizes.
  • Each of the outlet openings 9 is assigned a channel between two screw flights. This means or results in an equalization the conveying of goods in the annular space, which favors the classification and the discharge of the classified goods into the hot silos 6.
  • Four outlet openings 9 and four screws 31 are preferably provided.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Road Paving Machines (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Auxiliary Devices For Music (AREA)
  • Centrifugal Separators (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Glass Compositions (AREA)

Abstract

The subject of the invention is a drum screen for conditioning and classifying granular material with an input device at the one end of the drum which rotates about its lying longitudinal axis and an output device for the conditioned material at the other drum end. The output device connects to an annular space which is formed between the drum and annular screen sections which are located one after the other in the longitudinal direction of the drum and concentrically surround the drum. The mesh width of the annular screen sections changes in such a way that the section with the smallest mesh width is the annular screen section nearest to the output device and the section with the largest mesh width is the annular screen section at the greatest distance from the output device, preferably located in the region of the input device. Between every two successive annular screen sections (7a, 7b), a channel-shaped profile (29), with the open side directed outwards, concentrically surrounds the drum (2) at a distance of the width of the annular space. The profile engages with a number of hook- shaped mounting elements (28), distributed over the circumference, over the respective profile flange of the annular screen sections ending at it, the annular screen sections being located with initially still extended hook parts (28b) essentially free of play between two channel profiles spaced in the longitudinal direction of the drum and being held after installation in the installation position with the hooks bent about the free flange ends during installation. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Siebtrommel gemäß dem Gattungsbegriff des Anspruches 1.The invention relates to a screening drum according to the preamble of claim 1.

Solche Siebtrommeln sind bekannt (EP-A-0.131.162) und werden beispielsweise angewendet, um das Material von Straßendecken unter Verwendung von Bitumen bzw. auf Asphalt und Splitt unterschiedlicher Körnung aufzubereiten. Splitt grober Körnung wird für den Aufbau eines Stützgerüstes, Splitt kleinerer Körnung wird zum teilweisen Füllen der Hohlräume des Stützgerüstes verwendet und das in die verbleibenden Hohlräume eindringende Bitumen dient der Bindung der übrigen Belagbestandteile. Eine gattungsgemäße Siebtrommel kann dabei zum Einsatz kommen, um die einzelnen Bestandteile in das richtige Mischungsverhältnis zu bringen und insbesondere durch Temperieren in der beheizten Mischtrommel aufzubereiten, wenn die einzelnen Komponenten der Straßendecke gleichzeitig auf dem Straßenunterbau aufgebracht werden sollen.Such screening drums are known (EP-A-0.131.162) and are used, for example, to prepare the material of road surfaces using bitumen or on asphalt and grit of different grain sizes. Coarse grit grit is used to build a support structure, smaller grit grit is used to partially fill the cavities of the support structure and the bitumen penetrating into the remaining cavities is used to bind the other covering components. A generic screening drum can be used to bring the individual components into the correct mixing ratio and, in particular, to prepare them by tempering in the heated mixing drum if the individual components of the road surface are to be applied to the road base at the same time.

Aufgabe der Erfindung ist es, eine gattungsgemäße Vorrichtung so auszubilden, daß die einzelnen Ringsiebabschnitte in besonders zweckmäßiger Weise der Trommel zugeordnet werden können. Unter einer "möglichst zweckmäßigen Weise" wird insbesondere verstanden, daß die Ringsiebabschnitte möglichst rasch und mit einem Minimum an Werkzeugaufwand montiert und demontiert werden können, und daß die montierten Ringsiebe im montierten Zustand zuverlässig der Trommel zugeordnet sind.The object of the invention is to design a generic device such that the individual ring screen sections can be assigned to the drum in a particularly expedient manner. A "possible as possible" is understood in particular that the ring screen sections can be assembled and disassembled as quickly as possible and with a minimum of tooling, and that the assembled ring screens are reliably assigned to the drum in the assembled state.

Der Lösung dieser Aufgabe dienen insbesondere die Merkmale des Patentanspruches 1, wobei Merkmale, die diese Lösung in zweckmäßiger Weise ausgestalten, Gegenstände von Unteransprüchen sind.The solution to this problem is served, in particular, by the features of patent claim 1, with features that design this solution in an expedient manner being the subject of subclaims.

In weiterer Ausgestaltung der Erfindung soll zusätzlich die Aufbereitung des Mischgutes verbessert werden, und der Lösung dieser Teilaufgabe dient es, die gesamte Trommel einschließlich der Siebe mit gegen die horizontale geneigter Längsachse anzuordnen.In a further embodiment of the invention, the preparation of the mixed material is also to be improved, and the solution to this subtask is to arrange the entire drum including the sieves with the longitudinal axis inclined towards the horizontal.

Die Erfindung ist nachfolgend näher erläutert, wozu auf die beigefügte Zeichnung Bezug genommen wird, in der bedeuten

  • Fig. 1 in schematischer Darstellung eine Mischtrommel in der Seitenansicht, in der bei der Aufbereitung des Straßendeckenmaterials diesem Altasphalt zugeführt wird, was jedoch nicht erfindungsnotwendig ist,
  • Fig. 2 einen Ausschnitt aus Fig. 1 mit mehr Einzelheiten,
  • Fig. 3 einen Schnitt nach der Linie III - III in Fig. 4,
  • Fig. 4 eine Ansicht in Richtung des Pfeiles C in Fig. 3.
The invention is explained in more detail below, for which reference is made to the accompanying drawings, in which:
  • 1 shows a schematic representation of a mixing drum in a side view, in which this old asphalt is fed in the processing of the road surface material, which is, however, not necessary for the invention,
  • 2 shows a detail from FIG. 1 with more details,
  • 3 shows a section along the line III-III in FIG. 4,
  • 4 is a view in the direction of arrow C in FIG. 3rd

In einem feststehenden Gehäuse 1 ist eine Trommel 2 mit der Längsachse 3 um diese Längsachse drehbar gelagert. In die Trommel 2 ragt von dem in der Darstellung linken Trommelenede aus ein Brenner 4, dessen Flammenlängsachse mit der Trommellängsachse 3 zusammenfällt. Der Brenner kann grundsätzlich beliegiger Art und mit Gas oder Öl zu betreiben sein. Der Antrieb der Trommel 2 erfolgt von einem nicht dargestellten Motor aus über ein Getriebe, das einen die Trommel umgebenden, fest mit dieser verbundenen Laufring 5 einschließt. Am unteren Ende sind an das Gehäuse 1 mehrere sogenannte Heißsilos 6, in Trommellängsrichtung aufeinanderfolgend angeordnet. Diese Heißsilos sind gegen Temperaturabstrahlung weitgehend isolierte trichterförmige Behälter, die aus der Trommel 1 austretenden Splitt unterschiedlicher Partikelgröße mit Bitumen bzw. Asphalt vermischt aufnehmen und ihn zur weiteren Verarbeitung auf ein Förderband aufgeben.A drum 2 with the longitudinal axis 3 is rotatably mounted about this longitudinal axis in a fixed housing 1. A burner 4, whose longitudinal flame axis coincides with the longitudinal drum axis 3, projects into the drum 2 from the drum end shown on the left in the illustration. The burner can basically be of any type and can be operated with gas or oil. The drum 2 is driven by a motor (not shown) via a gear unit which includes a race 5 surrounding the drum and firmly connected to it. At the lower end, a plurality of so-called hot silos 6 are arranged one after the other in the longitudinal direction of the drum on the housing 1. These hot silos are funnel-shaped containers that are largely insulated from temperature radiation, which receive chips of different particle sizes emerging from the drum 1 mixed with bitumen or asphalt and place them on a conveyor belt for further processing.

Um die Klassierung des Gutes vornehmen zu können, sind in Trommellängsrichtung aufeinanderfolgend Rundsiebe 7 auf der Trommel 2 angeordnet derart, daß zwischen dem Mantel der Trommel 2 und den Rundsieben 7 ein Ringraum 8 besteht. Die Rundsiebe haben unterschiedliche Maschenweiten, wobei sich das Rundsieb 7a mit der größten Maschenweite an dem in der Zeichnung rechten, das Rundsieb 7d mit der kleinsten Maschenweite sich an dem in der Zeichnung linken Ende der Trommel 2 befindet. Der Ringraum 8 steht mit dem Innenraum der Trommel 2 über Öffnungen 9 in Verbindung, die an dem in der Zeichnung linken Trommelende gleichmäßig auf den Trommelumfang verteilt sind.In order to be able to classify the material, circular screens 7 are arranged in succession in the longitudinal direction of the drum on the drum 2 such that an annular space 8 exists between the jacket of the drum 2 and the circular screens 7. The circular sieves have different mesh sizes, the circular sieve 7a with the largest mesh size being on the right in the drawing, the circular sieve 7d with the smallest mesh size being on the left end of the drum 2 in the drawing. The annular space 8 communicates with the interior of the drum 2 via openings 9 which are evenly distributed over the drum circumference at the drum end on the left in the drawing.

Beim Betrieb der Anlage wird nun an beiden Trommelenden unterschiedliches Gut über je eine Aufgabevorrichtung 10 und 11 in die Trommel 2 eingegeben. Über die Aufgabevorrichtung 10 am rechten, dem Brenner 4 abgekehrten Ende der Trommel wird neues Gut im kalten Zustand, also insbesondere Splitt unterschiedlicher Körnung, in die Trommel eingegeben, und dieses Gut wandert der Flamme des Brenners 4 entgegen und wird dabei auf die gewünschte Temperatur aufgeheizt. Über die Aufgabevorrichtung 11 am Trommelende des Brenners 4 wird Altasphalt in die Trommel eingegeben. Das Gemisch aus Altasphalt und Splitt gelangt durch die Öffnungen 9 hindurch in den Ringraum 8 und von dort, klassiert nach der jeweiligen Splittgröße, in die Heißsilos 6 und kann diesen für die Weiterverarbeitung entnommen werden.During operation of the system, different material is now input into the drum 2 at both drum ends via a respective feed device 10 and 11. Via the feed device 10 at the right end of the drum facing away from the burner 4, new material is introduced into the drum in the cold state, in particular chippings of different grain sizes, and this material migrates towards the flame of the burner 4 and is thereby heated to the desired temperature . Waste asphalt is introduced into the drum via the feed device 11 at the end of the burner 4. The mixture of old asphalt and grit passes through the openings 9 into the annular space 8 and from there, classified according to the size of the grit, into the hot silos 6 and can be removed for further processing.

Der Staub- und Feuchtigkeitsaustrag erfolgt durch einen Abgaskamin 19 am Trommelende der Aufgabevorrichtung.The dust and moisture is discharged through an exhaust stack 19 at the drum end of the feed device.

Die Befestigung der mittleren Rundsiebe 7 auf der Trommel 2 erfolgt erfindungsgemäß so, wie in Fig. 2-4 dargestellt.The central circular sieves 7 are attached to the drum 2 in accordance with the invention as shown in FIGS. 2-4.

Abstandsstückpaare 22,23 sind in den Bereichen zu beiden Seiten der Ebene 21 angeordnet, die die Spaltbreite zwischen Trommel 2 und Rundsieben 7 im wesentlichen bestimmen. Die Abstandsstückpaare 22,23 sind auf den Umfang der Trommel 2 unter Einhaltung großer Abstände gleichmäßig verteilt. Jedes Abstandsstück 22 bzw. 23 ist ein in Trommellängsrichtung verlaufendes Strangprofil mit U-förmigem Querschnitt, wobei die Abstandsstücke eines jeden Abstandsstückpaares unter Einhaltung eines relativ geringen Abstandes in der Umfangsrichtung der Trommel mit ihrem Rücken 24 voneinander abgekehrt aufeinander folgen und mit ihren radial inneren Flanschen 25 an der Trommel 2 befestigt sind. Die Länge jedes Abstandsstückes (Strangprofiles) 22 bzw. 23 entspricht etwa der Länge eines der Rundsiebe 7. Zwischen dem "einen" Abstandstück 22 eines Abstandstückpaares und dem "anderen" Abstandsstück 23 des in Umfangsrichtung der Trommel 2 nächstfolgenden Abstandstückpaares ist eine Siebauflage 26 angeordnet, wobei es sich um ein im Querschnitt flaches und rechteckiges Strangprofil handelt, das in Umfangsrichtung der Trommel verläuft, deren Kontur folgt und am einen Ende mit dem "einen", am anderen Ende mit dem "anderen" der vorerwähnten paarweise angeordneten, im Querschnitt U-förmigen Abstandsstücke fest verbunden, insbesondere verschweißt ist. Auf der Oberseite dieser flachen, im Querschnitt rechteckigen Siebauflagen und auf den äußeren Flanschen 25a der Abstandsstücke 22, 23 liegen die Rundsiebe auf. In dieser Position werden die Rundsiebe an jedem ihrer Enden mit einem Spannband 27 gehalten. Jedes Spannband ist ein Federstahlstreifen, der in Umfangsrichtung der Trommel 2 verläuft, und dessen Länge mit einem Spannschloß zwischen seinen beiden Enden so einstellbar ist, daß das jeweilige Rundsiebende zwischen dem zugehörigen Spannband und der zugehörigen Siebauflage spielfrei festgehalten ist. Auf die Länge jedes Spannbandes gleichmäßig verteilt, sind im Ausgangszustand winkelförmige Haltemittel 28 verteilt. Der horizontale Schenkel 28a des jeweiligen Haltemittels ist fest mit dem Spannband 27 verbunden, beispielsweise verschweißt. Der andere Schenkel 28b ist als flanschartiger Abschnitt radial nach außen gerichtet und kann nach Aufbringen und Anziehen des Spannbandes 27 funktionell als Teil der Ringsiebe angesehen werden.Spacer pairs 22, 23 are arranged in the areas on both sides of the plane 21, which essentially determine the gap width between the drum 2 and the circular screens 7. The spacer pairs 22, 23 are evenly distributed over the circumference of the drum 2 while maintaining large distances. Each spacer 22 or 23 is an extruded profile running in the longitudinal direction of the drum with a U-shaped cross-section, the spacers of each pair of spacers following one another with their back 24 facing away from one another and with their radially inner flanges 25, while maintaining a relatively small distance in the circumferential direction of the drum are attached to the drum 2. The length of each spacer (extruded profile) 22 or 23 corresponds approximately to the length of one of the circular screens 7. Between the "one" spacer 22 of a pair of spacers and the "other" spacer 23 of the next pair of spacers in the circumferential direction of the drum 2, a screen support 26 is arranged, which is an extruded profile with a flat cross section, which runs in the circumferential direction of the drum, the contour of which follows and at one end with the "one" and at the other end is firmly connected, in particular welded, to the "other" of the above-mentioned paired spacers which are U-shaped in cross section. The circular sieves rest on the top of these flat sieve supports, which are rectangular in cross section, and on the outer flanges 25a of the spacers 22, 23. In this position, the circular sieves are held at each of their ends with a tension band 27. Each tension band is a spring steel strip which runs in the circumferential direction of the drum 2, and the length of which can be adjusted with a turnbuckle between its two ends so that the respective round screen end is held without play between the associated tension band and the associated sieve support. Evenly distributed over the length of each tensioning band, angular holding means 28 are distributed in the initial state. The horizontal leg 28a of the respective holding means is firmly connected to the tightening strap 27, for example welded. The other leg 28b is directed radially outwards as a flange-like section and can be functionally regarded as part of the ring sieves after the tensioning band 27 has been applied and tightened.

Zwischen je zwei symmetrisch zu einer Ebene 21 angeordneten Siebauflagen 26 ist ein in Umfangsrichtung der Trommel 2 verlaufendes Strangprofil 29 mit ebenfalls U-förmigem Querschnitt gehalten. Dieses Strangprofil 29 ist fest mit den Siebauflagen zu seinen beiden Seiten verbunden, insbesondere mit ihnen verschweißt.An extruded profile 29, which also extends in the circumferential direction of the drum 2 and also has a U-shaped cross section, is held between two screen supports 26 arranged symmetrically to a plane 21. This extruded profile 29 is firmly connected to the screen supports on its two sides, in particular welded to them.

Zum Einbau der Rundsiebe sind mit der Trommel 2 die Abstandsstücke 22, 23 verschweißt, mit diesen sind die Siebauflagen 26 verschweißt, und mit diesen wiederum sind die Strangprofile 29 verschweißt. Auf die derart vorbereitete Trommel 2 wird nun zu beiden Seiten eines Strangprofiles 29 bzw. zwischen zwei in Trommellängsrichtung aufeinanderfolgenden Strangprofilen 29 eines der Rundsiebe eingelegt. Dann wird das Spannband 27 mit den Haltemitteln 28 an jedem Ende des jeweiligen Siebes auf- und festgezogen. Danach liegen die radial nach außen gerichteten Schenkel der Haltemittel 28 möglichst spiellos an den Seiten der Strangprofile 29 an. Das Material der Haltemittel 28 gestattet es nun, daß die über die Flansche des Strangprofiles 29 radial hinausstehenden Enden der radial nach außen gerichteten Schenkel 28a (Fig.3, links) um die oberen Enden der Flansche der Strangprofile 29 gekantet werden (Fig.3, rechts) und damit die Spannbänder und damit wiederum die Siebe zuverlässig gegenüber der Trommel 2 fixiert sind.To install the circular sieves, the spacers 22, 23 are welded to the drum 2, the sieve supports 26 are welded to them, and the extruded profiles 29 are welded to them. The drum 2 prepared in this way is now on both sides of an extruded profile 29 or between two in Drum longitudinal direction successive extruded profiles 29 inserted one of the rotary screens. Then the tensioning band 27 with the holding means 28 is pulled up and down at each end of the respective screen. Thereafter, the radially outwardly directed legs of the holding means 28 rest against the sides of the extruded profiles 29 without any play. The material of the holding means 28 now allows the ends of the radially outwardly directed legs 28a (FIG. 3, left) projecting radially beyond the flanges of the extruded profile 29 to be folded around the upper ends of the flanges of the extruded profiles 29 (FIG. 3, right) and thus the tensioning straps and thus in turn the sieves are reliably fixed in relation to drum 2.

Bei der beschriebenen, erfindungsgemäßen Ausgestaltung ist es möglich, die Siebe in einfacher Weise ein- und auszubauen sowie zu wechseln und trotzdem ohne besondere Hilfsmittel die Siebe zuverlässig zu lokalisieren.In the described configuration according to the invention, it is possible to install and remove and change the screens in a simple manner and still reliably locate the screens without special aids.

Der Verbesserung des Betriebes einer solcherart montierten Siebtrommel dienen nun noch zwei weitere Merkmale, mit denen die Erfindung ausgestaltet wird.Two further features with which the invention is embodied now serve to improve the operation of a sieve drum mounted in this way.

Zum einen ist die Siebtrommel in ihrer Gesamtheit gegenüber der Horizontalen 30 derart schräg gestellt, daß zwischen ihr und der Trommellängsache 3 ein Winkel α von etwa 4° besteht derart, daß das Austragsende höher liegt als das Aufgabeende mit der Aufgabevorrichtung 10. Diese Maßnahme begünstigt die Gutdurchmischung, indem die Verweildauer des Gutes in der Trommel vergrößert wird und das Gut eine radiale Bewegungskomponente erhält.On the one hand, the sieve drum in its entirety is inclined relative to the horizontal 30 in such a way that there is an angle α of approximately 4 ° between it and the longitudinal drum 3 such that the discharge end is higher than the end of the feed with the feed device 10. This measure favors the Mixing of goods by increasing the length of time the goods stay in the drum and giving the goods a radial movement component.

Zum anderen ist in dem Ringraum zwischen der Trommel und dem Sieb bzw. den aufeinanderfolgenden Siebabschnitten unterschiedlicher Maschenweiten eine mehrgängige Schnecke 31 angeordnet. Jeder der Auslaßöffnungen 9 ist eine Rinne zwischen je zwei Schneckengängen zugeordnet. Dies bedeutet bzw. hat zur Folge eine Vergleichmäßigung der Gutförderung in dem Ringraum, was die Klassierung und den Austrag des klassierten Gutes in die Heißsilos 6 begünstigt. Vorzugsweise sind vier Auslaßöffnungen 9 und vier Schnecken 31 vorgesehen.On the other hand, a multi-start screw 31 is arranged in the annular space between the drum and the screen or the successive screen sections of different mesh sizes. Each of the outlet openings 9 is assigned a channel between two screw flights. This means or results in an equalization the conveying of goods in the annular space, which favors the classification and the discharge of the classified goods into the hot silos 6. Four outlet openings 9 and four screws 31 are preferably provided.

An den Trommelenden wird entweder in der beschriebenen Weise nur der eine Flansch des im Querschnitt U-förmigen Strangprofiles 29 benutzt, oder an die Stelle der in Fig.3 dargestellten Anordnung tritt nur die Hälfte rechts bzw. links der Ebene 21, je nachdem ob es sich um das in Fig. 1 linke oder rechte Ende der Trommel handelt.At the ends of the drum, either only one flange of the extruded profile 29 with a U-shaped cross section is used in the manner described, or only half of the right or left of the plane 21 takes the place of the arrangement shown in FIG. 3, depending on whether it is is the left or right end of the drum in FIG. 1.

Claims (12)

1. A screening drum of conditioning and sorting granular material and having an input device (10) at one end of the drum (2), which rotates around its horizontal longitudinal axis (3), and a device (9) for outputting the conditioned material at the other end of the drum, the output device being connected to an annular chamber formed across the drum and in the longitudinal direction of the drum so as to maintain an axial gap between each successive annular screen portion (7) concentrically surrounding and secured to the drum, the mesh width of the annular screen portions varying so that the portion having the smallest mesh width is nearest to the output device (9) whereas the portion having the greatest mesh width is furthest from the output device, preferably near the input device (10),
characterised in that
the axial gaps between each pair of annular screen portions (7a, 7b) concentrically surround the drum (2) and each portion contains a channel-like extruded section member (29) having its open side outwards, the outer sides of each section member being adjacent a flanged radially outwardly extending portion (28) of a means (28) for holding the annular screen portions, and after each annular screen has been installed the flanged portion is initially straight and projects beyond the section member, after which the portion projecting beyond the section member is bent around one edge of the section member and placed against the adjacent inner side thereof, so that the annular screen portion forms a hook extending over the section member.
2. A screening drum according to claim 1,
characterised in that
each annular screen member (7a, 7b), on both sides of a channel-like extruded section member (29), rests on a screen support (26) which surrounds the drum (2) and lies in the same peripheral plane as the web of the section member.
3. A screening drum according to claim 1,
characterised in that
each annular screen portion (7a, 7b) is secured to its support (26) by a continuous tension band (27).
4. A screening drum according to any claims 1 to 3,
characterised in that
hooked retaining means (28) are secured to the tension band (27) and engage in the extruded section member (29)
5. A screening drum according to any claims 2 to 4,
characterised in that
the screen supports (26) are permanently secured to both sides of a respective extruded section member (29) end bear on the drum well with interposition of spacer members (22, 23).
6. A screening drum according to claim 5,
characterised in that
the spacer members (22, 23) are extruded section members having a channel-like cross-section and an inner flange (25) which bears on the drum (2) and lie in slots between the screen supports (26).
7. A screening drum according to any claims 1 to 6,
characterised in that
a multi-thread screw conveyor (31) is disposed in the annular space between the drum (2) and the annular screens (7) and is permanently connected to the drum.
8. A screening drum according to claim 7,
characterised in that
the drum has an outlet opening (9) for each thread of the screw conveyor.
9. A screening drum according to claims 7 and 8
characterised by
four screw threads and four outlet openings (9).
10. A screening drum according to any claims 1 to 9,
characterised in that
the longitudinal axis (3) of the drum is somewhat inclined relative to the horizontal plane (30) in which the axis lies at one end of the drum.
11. A screening drum according to claim 10,
characterised in that
the angle of inclination is about 10°.
12. A screening drum according to claims 10 or 11,
characterised in that
the spex of the angle of inclination (α) is near the output end of the drum (2).
EP89100889A 1988-01-19 1989-01-19 Drum screen Expired - Lifetime EP0325253B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100889T ATE77977T1 (en) 1988-01-19 1989-01-19 SCREEN DRUM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3801383A DE3801383A1 (en) 1988-01-19 1988-01-19 SEVENTH DRUM
DE3801383 1988-01-19

Publications (3)

Publication Number Publication Date
EP0325253A2 EP0325253A2 (en) 1989-07-26
EP0325253A3 EP0325253A3 (en) 1990-07-04
EP0325253B1 true EP0325253B1 (en) 1992-07-08

Family

ID=6345532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100889A Expired - Lifetime EP0325253B1 (en) 1988-01-19 1989-01-19 Drum screen

Country Status (8)

Country Link
EP (1) EP0325253B1 (en)
JP (1) JPH07106337B2 (en)
AT (1) ATE77977T1 (en)
DE (2) DE3801383A1 (en)
DK (1) DK728288A (en)
FI (1) FI91368C (en)
NO (1) NO890225L (en)
YU (1) YU11089A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121585C1 (en) * 1991-06-29 1992-08-06 Lintec Gmbh & Co Kg, 2114 Hollenstedt, De
DE4134194C1 (en) * 1991-10-16 1993-05-19 Bernhard Farwick Gmbh & Co Kg, 4740 Oelde, De Drum sifter with drum-shaped support - has fastening belt securing hooks at support, or segment retaining strips
AT2514U1 (en) * 1997-12-17 1998-12-28 Burgstaller Gmbh H SCREEN DRUM FOR DRUM SCREENING MACHINE
DE202007004462U1 (en) * 2007-03-19 2008-07-31 Gala Kunststoff- Und Kautschukmaschinen Gmbh centrifugal
CN106890786A (en) * 2017-04-18 2017-06-27 石台依然农产品有限公司 A kind of novel tea grader

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1379550A (en) * 1920-10-25 1921-05-24 Baker Perkins Mfg Corp Flour-sifter
US1948606A (en) * 1931-01-12 1934-02-27 Arthur J Weinig Separating apparatus
JPS53150971U (en) * 1977-05-06 1978-11-28
DE3135294A1 (en) * 1980-05-29 1983-03-24 Hannes-Jürgen 3000 Hannover Kapuschinski Screening device
JPS5786670U (en) * 1980-11-17 1982-05-28
DE3320682A1 (en) * 1983-06-08 1984-12-13 Linnhoff & Thesenfitz Maschinenbau GmbH, 2090 Winsen DEVICE FOR THE PREPARATION OF ROAD COVERINGS

Also Published As

Publication number Publication date
EP0325253A3 (en) 1990-07-04
DE3801383A1 (en) 1989-07-27
YU11089A (en) 1991-04-30
NO890225L (en) 1989-07-20
JPH07106337B2 (en) 1995-11-15
FI890271A0 (en) 1989-01-18
ATE77977T1 (en) 1992-07-15
JPH01288379A (en) 1989-11-20
NO890225D0 (en) 1989-01-18
DK728288A (en) 1989-07-20
DE3801383C2 (en) 1991-03-21
DE58901781D1 (en) 1992-08-13
EP0325253A2 (en) 1989-07-26
DK728288D0 (en) 1988-12-29
FI890271A (en) 1989-07-20
FI91368B (en) 1994-03-15
FI91368C (en) 1994-06-27

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