EP3586983A1 - Sieve machine and method for sieving powder-form material - Google Patents

Sieve machine and method for sieving powder-form material Download PDF

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Publication number
EP3586983A1
EP3586983A1 EP19177875.2A EP19177875A EP3586983A1 EP 3586983 A1 EP3586983 A1 EP 3586983A1 EP 19177875 A EP19177875 A EP 19177875A EP 3586983 A1 EP3586983 A1 EP 3586983A1
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EP
European Patent Office
Prior art keywords
carrier
sieve
screening machine
machine according
outlet
Prior art date
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Granted
Application number
EP19177875.2A
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German (de)
French (fr)
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EP3586983B1 (en
Inventor
Frank Scholz
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Ib Verfahrens und Anlagentechnik & Co KG GmbH
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Ib Verfahrens und Anlagentechnik & Co KG GmbH
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Classifications

    • 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
    • B07B1/50—Cleaning
    • 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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/40—Resonant vibration screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • B08B7/026—Using sound waves
    • B08B7/028—Using ultrasounds
    • 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
    • B07B1/50—Cleaning
    • B07B1/54—Cleaning with beating devices
    • 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
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/04—The screen or the screened materials being subjected to ultrasonic vibration

Definitions

  • the present invention relates to a screening machine for separating a pulverulent material, having an inlet for the pulverulent material, a sieve held on a carrier, a first outlet for the oversize grain and a second outlet for the fine grain which has fallen through the sieve, the carrier being a frame comprises, on which the sieve is tensioned and the carrier can be moved via an ultrasound converter, and a method for sieving powdered material in a sieving machine.
  • the DE 10 2006 047 592 B4 discloses an apparatus for cleaning a screen fabric enclosed in a screen frame by means of ultrasound, in which an ultrasound converter excites the screen to vibrate over a sound conductor arranged on the movable part of the screen frame. Here, the sound conductor is decoupled through the upper part.
  • ultrasound converters can clean the sieve by movement, the struts only locally energizing the sieve.
  • the powdery material is placed on a sieve which is tensioned on a carrier, the carrier having a frame and a holder arranged inside the frame, to which an ultrasound converter is connected via a sound conductor, the holder via several struts is connected to the frame.
  • a carrier having a frame and a holder arranged inside the frame, to which an ultrasound converter is connected via a sound conductor, the holder via several struts is connected to the frame.
  • the carrier is preferably plate-shaped with openings at which the sieve is at least partially tensioned.
  • the sieve and the carrier can be rectangular in plan view, the carrier preferably projecting over the sieve on one end face, and an opening for disposing of the oversize particles to the outlet for the oversize particles is formed on the projecting section.
  • the opening for disposal of the oversize grain may not be formed inside the frame of the carrier, but outside.
  • the carrier can preferably be formed in one piece, for example from a metal sheet, in particular from a steel sheet.
  • the thickness of the carrier can be, for example, between 1.5 mm to 5 mm, preferably 2 to 4 mm, so that the sieve is supported stably over the carrier.
  • the sieve can be fixed to the support by gluing.
  • a plurality of struts preferably extend from the central holder to the frame in a star shape, in particular four to eight struts can be provided for connecting the central holder to the outer frame.
  • the holder can be provided exactly at a symmetrical center point of the carrier, but an off-center arrangement within the frame is also possible.
  • the screening machine preferably additionally comprises a conveyor drive in order to convey the powdery material on the screen from the inlet to the first outlet for the oversize grain.
  • the conveyor drive can move a housing of the screening machine in order to convey the powdery material on the screen in small steps from the inlet to the first outlet, provided it does not fall through the screen.
  • the screen can be designed, for example, to separate powdery material, in particular metal powder, for example aluminum powder for 3D printers.
  • the openings of the sieve can have an extension in both directions of, for example, between 10 ⁇ m to 200 ⁇ m, in particular between 50 ⁇ m to 100 ⁇ m, the size of the openings, however, depending on the specific application.
  • the powdery material is fed to an inlet and placed on a sieve held on a support.
  • the sieve is moved to convey the powdery material, the sieve additionally being cleaned by an ultrasound converter.
  • the top view of the ultrasound converter is connected to the carrier in a central region on a holder, so that the powdery material is divided.
  • the fine grain that has fallen through the sieve is removed at a second outlet, while the oversize grain that is conveyed through the sieve is removed at a first outlet.
  • a sieving machine 1 for sieving a powdery material comprises an inlet 2 for feeding the powdery material onto a sieve which is held on a carrier 8.
  • the screening machine 1 has a housing with a lower part 3 for collecting the sieved good grain, an outlet 10 for the good grain being provided on the lower part 3.
  • the lower part 3 comprises a connecting part 4, which is connected to a conveyor drive in order to move the housing of the screening machine 1 and to convey the powdery material on the screen from an inlet 2 to an outlet 9 for the oversize grain.
  • a conveyor drive can gradually convey the powdery material on the sieve.
  • the screening machine 1 comprises a cover or upper part 5 arranged on the lower part 3, on which one or more viewing windows 6 are provided.
  • the upper part 5 is arranged in a sealed manner on the lower part 3, and the interior of the housing can be filled with a gas, in particular an inert gas.
  • a sound conductor 11 is also passed through the upper part 5, which is intended to clean the sieve and is connected to an ultrasound converter 7.
  • the sound conductor 11 is decoupled through the upper part 5 and firmly connected to the carrier 8.
  • the ultrasound converter 7 can thus move the carrier 8 on the sound conductor 11, on which the sieve is stretched, the movements of the ultrasound converter 7 and those of the conveyor drive being superimposed.
  • the carrier 8 is shown in detail.
  • the carrier 8 is formed in one piece and has a thickness between 1.5 mm to 5 mm, in particular 2 mm to 4 mm.
  • the carrier 8 comprises an outer frame 13 which is rectangular in plan view and is at least twice as long as it is wide.
  • a holder 12 is provided, which is designed as a node and is connected to the sound conductor 11.
  • the holder 12 is arranged in the center of the frame 13 and connected to the frame 13 via a plurality of struts 14 arranged in a star shape.
  • struts 14 are provided by the holder 12 with the frame 13, the number of struts 14 can be varied, for example four to eight struts 14 can be provided.
  • the sieve is stretched on the carrier 8, in particular glued, and is fixed both on the struts 14 and on the frame 13.
  • the sieve does not completely cover the carrier 8, but an opening 16 is formed on an end face which is delimited by a cross strut 17 on the side facing the holder 12.
  • an end face of the screen is fixed.
  • the powdery material is first introduced into the inlet 2 and conveyed, for example, in an inert gas atmosphere.
  • the powdered material is then conveyed through the sieve through the conveyor drive to the opening 16, the smaller grain size falling through the sieve and only the larger oversize grain being conveyed into the opening 16 to the outlet 9 for the oversize grain.
  • the sieve is clogged slightly during the sieving process, so that cleaning is produced by the ultrasound converter 7 by moving the carrier 8 over the ultrasound converter 7, which leads to cleaning of the sieve.
  • the good grain that has fallen through the sieve is then processed further via the outlet 10.
  • the carrier 8 with the sieve is preferably inclined to the horizontal, so that the powdery material is conveyed uphill on the sieve.
  • the angle of inclination of the support with the sieve is, for example, in a range from 1 ° to 5 °, preferably 2 ° to 4 °.
  • Such a screening machine can be used, for example, to separate metal powder, for example for 3D printing applications, also in the context of additive manufacturing.
  • the screening machine can also be used in other areas.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

Eine Siebmaschine (1) zum Trennen eines pulverförmigen Materials umfasst einen Einlass (2) für das pulverförmige Material, ein auf einem Träger (8) gehaltenes Sieb, einen ersten Auslass (9) für das Überkorn und einen zweiten Auslass (10) für das durch das Sieb durchgefallene Gutkorn, wobei der Träger (8) einen Rahmen (13) umfasst, an dem das Sieb gespannt ist, und der Träger (8) über einen Ultraschallkonverter (7) bewegbar ist, wobei der Ultraschallkonverter (7) innerhalb des Rahmens (13) über einen Schallleiter (11) an einem Halter (12) mit dem Träger (8) verbunden ist und der Halter (12) über mehrere Streben (14) mit dem Rahmen (13) verbunden ist. Ferner betrifft die Erfindung ein Verfahren zum Sieben von pulverförmigem Material.A screening machine (1) for separating a pulverulent material comprises an inlet (2) for the pulverulent material, a sieve held on a support (8), a first outlet (9) for the oversize grain and a second outlet (10) for the through good grain which has fallen through the sieve, the carrier (8) comprising a frame (13) on which the sieve is tensioned, and the carrier (8) can be moved via an ultrasound converter (7), the ultrasound converter (7) inside the frame ( 13) is connected to the carrier (8) via a sound conductor (11) on a holder (12) and the holder (12) is connected to the frame (13) via a plurality of struts (14). The invention further relates to a method for sieving powdery material.

Description

Die vorliegende Erfindung betrifft eine Siebmaschine zum Trennen eines pulverförmigen Materials, mit einem Einlass für das pulverförmige Material, einem auf einem Träger gehaltenen Sieb, einem ersten Auslass für das Überkorn und einem zweiten Auslass für das durch das Sieb durchgefallene Gutkorn, wobei der Träger einen Rahmen umfasst, an dem das Sieb gespannt ist, und der Träger über einen Ultraschallkonverter bewegbar ist, und ein Verfahren zum Sieben von pulverförmigem Material in einer Siebmaschine.The present invention relates to a screening machine for separating a pulverulent material, having an inlet for the pulverulent material, a sieve held on a carrier, a first outlet for the oversize grain and a second outlet for the fine grain which has fallen through the sieve, the carrier being a frame comprises, on which the sieve is tensioned and the carrier can be moved via an ultrasound converter, and a method for sieving powdered material in a sieving machine.

Die DE 10 2006 047 592 B4 offenbart eine Vorrichtung zur Reinigung eines in einem Siebrahmen eingefassten Siebgewebes mittels Ultraschall, bei dem ein Ultraschall-Konverter über einem auf dem beweglichen Teil des Siebrahmens angeordneten Schallleiter das Sieb zu Schwingungen anregt. Hierbei ist der Schallleiter durch das Oberteil entkoppelt durchgeführt. Solche Ultraschall-Konverter können das Sieb durch die Bewegung reinigen, wobei die Streben das Sieb nur lokal anregen.The DE 10 2006 047 592 B4 discloses an apparatus for cleaning a screen fabric enclosed in a screen frame by means of ultrasound, in which an ultrasound converter excites the screen to vibrate over a sound conductor arranged on the movable part of the screen frame. Here, the sound conductor is decoupled through the upper part. Such ultrasound converters can clean the sieve by movement, the struts only locally energizing the sieve.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Siebmaschine zu schaffen, mittels der eine verbesserte Abreinigung eines Siebes ermöglicht wird, und ein Verfahren zum Sieben von pulverförmigem Material zu schaffen, das ein effektives Sieben ermöglicht.It is therefore an object of the present invention to provide a sieving machine by means of which an improved cleaning of a sieve is made possible, and to provide a method for sieving powdery material which enables effective sieving.

Diese Aufgabe wird mit einer Siebmaschine mit den Merkmalen des Anspruches 1 sowie einem Verfahren mit den Merkmalen des Anspruches 13 gelöst.This object is achieved with a screening machine with the features of claim 1 and a method with the features of claim 13.

Bei der erfindungsgemäßen Siebmaschine wird das pulverförmige Material auf ein Sieb gegeben, das an einem Träger gespannt ist, wobei der Träger einen Rahmen und einen innerhalb des Rahmens angeordneten Halter aufweist, an dem ein Ultraschallkonverter über einen Schallleiter angeschlossen ist, wobei der Halter über mehrere Streben mit dem Rahmen verbunden ist. Durch diese Gestaltung des Trägers kann der Ultraschallkonverter das Sieb in einer größeren Fläche reinigen, da der Träger angetrieben wird und die Bewegung des Trägers über verschiedene Bereiche in das Sieb eingeleitet wird. Dadurch kann der Ultraschallkonverter das Sieb großflächig abreinigen.In the sieving machine according to the invention, the powdery material is placed on a sieve which is tensioned on a carrier, the carrier having a frame and a holder arranged inside the frame, to which an ultrasound converter is connected via a sound conductor, the holder via several struts is connected to the frame. This design of the carrier enables the ultrasound converter to clean the sieve in a larger area, since the carrier is driven and the movement of the carrier is introduced into the sieve over different areas. This allows the ultrasonic converter to clean the screen over a large area.

Der Träger ist vorzugsweise plattenförmig mit Öffnungen ausgebildet, an denen das Sieb zumindest teilweise gespannt ist. Das Sieb und der Träger können dabei rechteckförmig in Draufsicht ausgebildet sein, wobei der Träger das Sieb vorzugsweise an einer Stirnseite überragt, und an dem überragenden Abschnitt eine Öffnung zum Entsorgen des Überkorns zu dem Auslass für das Überkorn ausgebildet ist. Alternativ kann die Öffnung zum Entsorgen des Überkorns nicht innerhalb des Rahmens des Trägers, sondern außerhalb gebildet sein.The carrier is preferably plate-shaped with openings at which the sieve is at least partially tensioned. The sieve and the carrier can be rectangular in plan view, the carrier preferably projecting over the sieve on one end face, and an opening for disposing of the oversize particles to the outlet for the oversize particles is formed on the projecting section. Alternatively, the opening for disposal of the oversize grain may not be formed inside the frame of the carrier, but outside.

Für eine einfache Herstellung des Trägers kann dieser vorzugsweise einstückig ausgebildet sein, beispielsweise aus einem Metallblech, insbesondere aus einem Stahlblech. Die Dicke des Trägers kann beispielsweise zwischen 1,5 mm bis 5 mm, vorzugsweise 2 bis 4 mm, betragen, so dass über den Träger das Sieb stabil abgestützt ist. Das Sieb kann durch Verkleben an dem Träger festgelegt sein.For simple manufacture of the carrier, it can preferably be formed in one piece, for example from a metal sheet, in particular from a steel sheet. The thickness of the carrier can be, for example, between 1.5 mm to 5 mm, preferably 2 to 4 mm, so that the sieve is supported stably over the carrier. The sieve can be fixed to the support by gluing.

Von dem mittigen Halter erstrecken sich vorzugsweise mehrere Streben sternförmig zu dem Rahmen, insbesondere können vier bis acht Streben zur Verbindung des mittigen Halters mit dem äußeren Rahmen vorgesehen sein. Der Halter kann dabei exakt an einem symmetrischen Mittelpunkt des Trägers vorgesehen sein, aber auch eine außermittige Anordnung innerhalb des Rahmens ist möglich.A plurality of struts preferably extend from the central holder to the frame in a star shape, in particular four to eight struts can be provided for connecting the central holder to the outer frame. The holder can be provided exactly at a symmetrical center point of the carrier, but an off-center arrangement within the frame is also possible.

Die Siebmaschine umfasst bevorzugt zusätzlich einen Förderantrieb, um das pulverförmige Material auf dem Sieb von dem Einlass zu dem ersten Auslass für das Überkorn zu fördern. Der Förderantrieb kann dabei ein Gehäuse der Siebmaschine bewegen, um das pulverförmige Material auf dem Sieb in kleinen Schritten vom Einlass zum ersten Auslass zu fördern, sofern es nicht durch das Sieb fällt. Dadurch überlagern sich die Bewegungen des Förderantriebes und die Bewegung des Siebes durch den Ultraschallkonverter zum Abreinigen des Siebes.The screening machine preferably additionally comprises a conveyor drive in order to convey the powdery material on the screen from the inlet to the first outlet for the oversize grain. The conveyor drive can move a housing of the screening machine in order to convey the powdery material on the screen in small steps from the inlet to the first outlet, provided it does not fall through the screen. As a result, the movements of the conveyor drive and the movement of the screen through the ultrasonic converter for cleaning the screen overlap.

Das Sieb kann beispielsweise zum Trennen von pulverförmigem Material, insbesondere Metallpulver, beispielsweise Aluminiumpulver für 3D-Drucker, ausgebildet sein. Die Öffnungen des Siebes können in beide Richtungen eine Erstreckung von beispielsweise zwischen 10 µm bis 200 µm, insbesondere zwischen 50 µm bis 100 µm, besitzen, wobei die Größe der Öffnungen allerdings vom konkreten Anwendungsfall abhängt.The screen can be designed, for example, to separate powdery material, in particular metal powder, for example aluminum powder for 3D printers. The openings of the sieve can have an extension in both directions of, for example, between 10 μm to 200 μm, in particular between 50 μm to 100 μm, the size of the openings, however, depending on the specific application.

Bei dem erfindungsgemäßen Verfahren wird das pulverförmige Material zu einem Einlass zugeführt und auf ein an einem Träger gehaltenes Sieb gegeben. Das Sieb wird zum Fördern des pulverförmigen Materials bewegt, wobei zusätzlich das Sieb durch einen Ultraschallkonverter gereinigt wird. Der Ultraschallkonverter ist in Draufsicht in einem mittleren Bereich an einem Halter mit dem Träger verbunden, so dass das pulverförmige Material aufgeteilt wird. Das durch das Sieb gefallene Gutkorn wird an einem zweiten Auslass entfernt, während das über das Sieb geförderte Überkorn an einem ersten Auslass entfernt wird.In the method according to the invention, the powdery material is fed to an inlet and placed on a sieve held on a support. The sieve is moved to convey the powdery material, the sieve additionally being cleaned by an ultrasound converter. The top view of the ultrasound converter is connected to the carrier in a central region on a holder, so that the powdery material is divided. The fine grain that has fallen through the sieve is removed at a second outlet, while the oversize grain that is conveyed through the sieve is removed at a first outlet.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels mit Bezug auf die beigefügten Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine perspektivische Ansicht einer erfindungsgemäßen Siebmaschine;
Figur 2
eine Schnittansicht durch die Siebmaschine der Figur 1, und
Figuren 3A und 3B
zwei Ansichten eines Trägers der Siebmaschine der Figur 1.
The invention is explained below using an exemplary embodiment with reference to the accompanying drawings. Show it:
Figure 1
a perspective view of a screening machine according to the invention;
Figure 2
a sectional view through the screening machine of the Figure 1 , and
Figures 3A and 3B
two views of a carrier of the screening machine of FIG. 1.

Eine Siebmaschine 1 zum Sieben eines pulverförmigen Materials umfasst einen Einlass 2 zur Aufgabe des pulverförmigen Materials auf ein Sieb, das an einem Träger 8 gehalten ist. Die Siebmaschine 1 besitzt ein Gehäuse mit einem Unterteil 3 zum Auffangen des gesiebten Gutkorns, wobei an dem Unterteil 3 ein Auslass 10 für das Gutkorn vorgesehen ist. Das Unterteil 3 umfasst ein Verbindungsteil 4, das mit einem Förderantrieb verbunden ist, um das Gehäuse der Siebmaschine 1 zu bewegen und das pulverförmige Material auf dem Sieb von einem Einlass 2 zu einem Auslass 9 für das Überkorn zu fördern. Ein solcher Förderantrieb kann das pulverförmige Material schrittweise auf dem Sieb fördern.A sieving machine 1 for sieving a powdery material comprises an inlet 2 for feeding the powdery material onto a sieve which is held on a carrier 8. The screening machine 1 has a housing with a lower part 3 for collecting the sieved good grain, an outlet 10 for the good grain being provided on the lower part 3. The lower part 3 comprises a connecting part 4, which is connected to a conveyor drive in order to move the housing of the screening machine 1 and to convey the powdery material on the screen from an inlet 2 to an outlet 9 for the oversize grain. Such a conveyor drive can gradually convey the powdery material on the sieve.

Die Siebmaschine 1 umfasst eine auf dem Unterteil 3 angeordnete Abdeckung oder Oberteil 5, an der ein oder mehrere Sichtfenster 6 vorgesehen sind. Das Oberteil 5 ist abgedichtet an dem Unterteil 3 angeordnet, und der Innenraum des Gehäuses kann mit einem Gas, insbesondere einem Inertgas, befüllt sein.The screening machine 1 comprises a cover or upper part 5 arranged on the lower part 3, on which one or more viewing windows 6 are provided. The upper part 5 is arranged in a sealed manner on the lower part 3, and the interior of the housing can be filled with a gas, in particular an inert gas.

Durch das Oberteil 5 ist ferner ein Schallleiter 11 durchgeführt, der das Sieb abreinigen soll und mit einem Ultraschallkonverter 7 verbunden ist. Hierfür ist der Schallleiter 11 entkoppelt durch das Oberteil 5 durchgeführt und mit dem Träger 8 fest verbunden. Der Ultraschallkonverter 7 kann somit über den Schallleiter 11 den Träger 8 bewegen, an dem das Sieb aufgespannt ist, wobei sich die Bewegungen des Ultraschallkonverters 7 und die des Förderantriebs überlagern.A sound conductor 11 is also passed through the upper part 5, which is intended to clean the sieve and is connected to an ultrasound converter 7. For this purpose, the sound conductor 11 is decoupled through the upper part 5 and firmly connected to the carrier 8. The ultrasound converter 7 can thus move the carrier 8 on the sound conductor 11, on which the sieve is stretched, the movements of the ultrasound converter 7 and those of the conveyor drive being superimposed.

In den Figuren 3A und 3B ist der Träger 8 im Detail dargestellt. Der Träger 8 in einstückig ausgebildet und weist eine Dicke zwischen 1,5 mm bis 5 mm, insbesondere 2 mm bis 4 mm, auf. Der Träger 8 umfasst einen äußeren Rahmen 13, der in Draufsicht rechteckförmig ausgebildet ist und mindestens doppelt so lang wie breit ist. In einem mittleren Bereich des Rahmens 13 ist ein Halter 12 vorgesehen, der als Knotenpunkt ausgebildet ist und mit dem Schallleiter 11 verbunden ist. Der Halter 12 ist mittig in dem Rahmen 13 angeordnet und über eine Vielzahl von sternförmig angeordneten Streben 14 mit dem Rahmen 13 verbunden. In dem dargestellten Ausführungsbeispiel sind sechs Streben 14 von dem Halter 12 mit dem Rahmen 13 vorgesehen, wobei die Anzahl der Streben 14 variiert werden kann, beispielsweise können vier bis acht Streben 14 vorgesehen werden. Das Sieb ist auf dem Träger 8 gespannt, insbesondere verklebt, und dabei sowohl an den Streben 14 als auch an dem Rahmen 13 fixiert. Das Sieb überdeckt den Träger 8 dabei nicht vollständig, sondern an einer Stirnseite ist eine Öffnung 16 ausgebildet, die auf der zu dem Halter 12 gewandten Seite durch eine Querstrebe 17 begrenzt ist. An dieser Querstrebe 17 ist ein stirnseitiges Ende des Siebes fixiert. Dadurch kann das Überkorn, das auf dem Sieb gefördert wird, bei Übertreten der Querstrebe 17 durch die Öffnung 16 in den Auslass 9 für das Überkorn fallen.In the Figures 3A and 3B the carrier 8 is shown in detail. The carrier 8 is formed in one piece and has a thickness between 1.5 mm to 5 mm, in particular 2 mm to 4 mm. The carrier 8 comprises an outer frame 13 which is rectangular in plan view and is at least twice as long as it is wide. In a central area of the frame 13, a holder 12 is provided, which is designed as a node and is connected to the sound conductor 11. The holder 12 is arranged in the center of the frame 13 and connected to the frame 13 via a plurality of struts 14 arranged in a star shape. In the illustrated embodiment, six struts 14 are provided by the holder 12 with the frame 13, the number of struts 14 can be varied, for example four to eight struts 14 can be provided. The sieve is stretched on the carrier 8, in particular glued, and is fixed both on the struts 14 and on the frame 13. The sieve does not completely cover the carrier 8, but an opening 16 is formed on an end face which is delimited by a cross strut 17 on the side facing the holder 12. At this cross strut 17 an end face of the screen is fixed. As a result, the oversize that is conveyed on the sieve can fall through the opening 16 into the outlet 9 for the oversize when the cross strut 17 is crossed.

Das pulverförmige Material wird zunächst in den Einlass 2 eingegeben, und beispielsweise in einer Inertgas-Atmosphäre gefördert. Dann wird das pulverförmige Material über das Sieb durch den Förderantrieb zu der Öffnung 16 gefördert, wobei das kleinere Gutkorn durch das Sieb fällt und nur das größere Überkorn in die Öffnung 16 zu dem Auslass 9 für das Überkorn gefördert wird. Das Sieb wird während des Siebvorganges leicht verstopft, so dass durch den Ultraschallkonverter 7 eine Abreinigung erzeugt wird, indem der Träger 8 über den Ultraschallkonverter 7 bewegt wird, was zu einer Reinigung des Siebes führt. Das durch das Sieb gefallene Gutkorn wird dann über den Auslass 10 weiterverarbeitet.The powdery material is first introduced into the inlet 2 and conveyed, for example, in an inert gas atmosphere. The powdered material is then conveyed through the sieve through the conveyor drive to the opening 16, the smaller grain size falling through the sieve and only the larger oversize grain being conveyed into the opening 16 to the outlet 9 for the oversize grain. The sieve is clogged slightly during the sieving process, so that cleaning is produced by the ultrasound converter 7 by moving the carrier 8 over the ultrasound converter 7, which leads to cleaning of the sieve. The good grain that has fallen through the sieve is then processed further via the outlet 10.

Der Träger 8 mit dem Sieb ist vorzugsweise geneigt zur Horizontalen ausgerichtet, so dass das pulverförmige Material auf dem Sieb bergauf gefördert wird. Der Neigungswinkel des Trägers mit dem Sieb liegt beispielsweise in einem Bereich von 1° bis 5°, vorzugsweise 2° bis 4°.The carrier 8 with the sieve is preferably inclined to the horizontal, so that the powdery material is conveyed uphill on the sieve. The angle of inclination of the support with the sieve is, for example, in a range from 1 ° to 5 °, preferably 2 ° to 4 °.

Eine solche Siebmaschine kann beispielsweise zum Trennen von Metallpulver eingesetzt werden, beispielsweise für 3D-Druckanwendungen, auch im Rahmen der additiven Fertigung. Auch in anderen Bereichen kann die Siebmaschine eingesetzt werden.Such a screening machine can be used, for example, to separate metal powder, for example for 3D printing applications, also in the context of additive manufacturing. The screening machine can also be used in other areas.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Siebmaschinescreening machine
22
Einlassinlet
33
Unterteillower part
44
Verbindungsteilconnecting part
55
Oberteiltop
66
Sichtfensterwindow
77
Ultraschallkonverterultrasonic converter
88th
Trägercarrier
99
Auslassoutlet
1010
Auslassoutlet
1111
Schallleitersound conductor
1212
Halterholder
1313
Rahmenframe
1414
Strebestrut
1616
Öffnungopening
1717
Querstrebecrossmember

Claims (13)

Siebmaschine (1) zum Trennen eines pulverförmigen Materials, mit einem Einlass (2) für das pulverförmige Material, einem auf einem Träger (8) gehaltenen Sieb, einem ersten Auslass (9) für das Überkorn und einem zweiten Auslass (10) für das durch das Sieb durchgefallene Gutkorn, wobei der Träger (8) einen Rahmen (13) umfasst, an dem das Sieb gespannt ist, und der Träger (8) über einen Ultraschallkonverter (7) bewegbar ist, dadurch gekennzeichnet, dass der Ultraschallkonverter (7) innerhalb des Rahmens (13) über einen Schallleiter (11) an einem Halter (12) mit dem Träger (8) verbunden ist und der Halter (12) über mehrere Streben (14) mit dem Rahmen (13) verbunden ist.Sieving machine (1) for separating a pulverulent material, with an inlet (2) for the pulverulent material, a sieve held on a carrier (8), a first outlet (9) for oversize and a second outlet (10) for through Gutkorn fallen through the sieve, wherein the carrier (8) comprises a frame (13) on which the sieve is stretched, and the carrier (8) can be moved via an ultrasound converter (7), characterized in that the ultrasound converter (7) inside the frame (13) is connected to the support (8) by a sound conductor (11) on a holder (12) and the holder (12) is connected to the frame (13) by a plurality of struts (14). Siebmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Träger (8) plattenförmig mit Öffnungen ausgebildet ist, an denen zumindest teilweise das Sieb gespannt ist.Screening machine according to claim 1, characterized in that the carrier (8) is plate-shaped with openings at which the screen is at least partially tensioned. Siebmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass von dem Halter (12) vier bis acht Streben (40) sternförmig mit dem Rahmen (13) verbunden sind.Screening machine according to claim 1 or 2, characterized in that from the holder (12) four to eight struts (40) are connected in a star shape to the frame (13). Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Träger (8) in Draufsicht rechteckförmig ausgebildet ist.Screening machine according to one of the preceding claims, characterized in that the carrier (8) is rectangular in plan view. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Träger (8) einstückig ausgebildet ist.Screening machine according to one of the preceding claims, characterized in that the carrier (8) is formed in one piece. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Träger (8) aus einem Metallblech hergestellt ist.Screening machine according to one of the preceding claims, characterized in that the carrier (8) is made from a metal sheet. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Förderantrieb vorgesehen ist, um das pulverförmige Material auf dem Sieb linear von dem Einlass (2) zu dem ersten Auslass (9) zu fördern.Screening machine according to one of the preceding claims, characterized in that a conveyor drive is provided in order to convey the powdery material on the screen linearly from the inlet (2) to the first outlet (9). Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in dem Träger (8) eine Öffnung (16) ausgebildet ist, durch die das Überkorn zu dem ersten Auslass (9) förderbar ist.Screening machine according to one of the preceding claims, characterized in that an opening (16) is formed in the carrier (8) through which the oversize grain can be conveyed to the first outlet (9). Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sieb zur Horizontalen geneigt angeordnet ist, vorzugsweise in einem Winkel zwischen 1° und 5°.Screening machine according to one of the preceding claims, characterized in that the screen is arranged inclined to the horizontal, preferably at an angle between 1 ° and 5 °. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Träger (8) eine Dicke zwischen 2 mm bis 5 mm besitzt.Screening machine according to one of the preceding claims, characterized in that the carrier (8) has a thickness between 2 mm and 5 mm. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sieb in einem Gehäuse angeordnet ist und der Ultraschallantrieb (7) durch eine obere Abdeckung (5) des Gehäuses durchgeführt ist.Screening machine according to one of the preceding claims, characterized in that the screen is arranged in a housing and the ultrasonic drive (7) is carried out through an upper cover (5) of the housing. Siebmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sieb Öffnungen zwischen 10 µ und 200 µ, insbesondere 50 µ bis 100 µ, besitzt.Screening machine according to one of the preceding claims, characterized in that the screen has openings between 10 µ and 200 µ, in particular 50 µ to 100 µ. Verfahren zum Sieben von pulverförmigem Material in einer Siebmaschine (1) mit den folgenden Schritten: - Zuführen von pulverförmigem Material an einem Einlass (2) auf ein an einem Träger (8) gehaltenen Sieb; - Bewegen des Siebes zum Fördern des pulverförmigen Materials entlang des Siebes zu einer Auslassöffnung (16) an dem Träger (8); - Reinigen des Siebes durch einen Ultraschallkonverter (7), der in Draufsicht in einem mittleren Bereich an einem Halter (12) mit dem Träger (8) verbunden ist, und - Entfernen des Überkorns an einem ersten Auslass (9) und des durch das Sieb gefallenen Gutkorns an einem zweiten Auslass (10). Method for sieving powdery material in a sieving machine (1) with the following steps: - feeding powder material at an inlet (2) onto a sieve held on a support (8); - moving the sieve to convey the powdery material along the sieve to an outlet opening (16) on the carrier (8); - Cleaning the sieve by an ultrasound converter (7), which is connected to the carrier (8) in a central area in a central area on a holder (12), and - Removing the oversized grain at a first outlet (9) and the fine grain fallen through the sieve at a second outlet (10).
EP19177875.2A 2018-06-29 2019-06-03 Sieve machine and method for sieving powder-form material Active EP3586983B1 (en)

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DE102018115831.9A DE102018115831A1 (en) 2018-06-29 2018-06-29 Screening machine and method for screening powdered material

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1581349A1 (en) * 2002-12-02 2005-10-05 Russell Finex Limited Sieving apparatus
JP2011245446A (en) * 2010-05-28 2011-12-08 Tokyo Seifunki Seisakusho:Kk Sieving device
DE102006047592B4 (en) 2006-10-05 2011-12-08 Artech Systems Ag Apparatus for exciting a sieve fabric enclosed in a sieve frame by means of ultrasound
DE202014103239U1 (en) * 2013-07-31 2014-08-18 Si Lin Yu Ultrasonic vibratory screening

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1094218A (en) * 1963-12-17 1967-12-06 Choompa Kogyo Kabushiki Kaisha Screening method for pulverized particles and apparatus therefor
DE4418175C5 (en) * 1993-05-26 2006-02-16 Telsonic Ag Apparatus and method for sifting, classifying, sifting, filtering or sorting fabrics
US6945168B1 (en) * 2004-04-29 2005-09-20 Niswonger John O H Apparatus and method for a silkscreen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1581349A1 (en) * 2002-12-02 2005-10-05 Russell Finex Limited Sieving apparatus
DE102006047592B4 (en) 2006-10-05 2011-12-08 Artech Systems Ag Apparatus for exciting a sieve fabric enclosed in a sieve frame by means of ultrasound
JP2011245446A (en) * 2010-05-28 2011-12-08 Tokyo Seifunki Seisakusho:Kk Sieving device
DE202014103239U1 (en) * 2013-07-31 2014-08-18 Si Lin Yu Ultrasonic vibratory screening

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