DE202018105632U1 - screening machine - Google Patents

Abstract

A sifting machine (1) for separating a powdery material, comprising a powdered material inlet (2), a screen supported on a carrier (8), a first oversize outlet (9), and a second outlet (10) for the sieve failed good grain, wherein the carrier (8) comprises a frame (13) on which the wire is stretched, and the carrier (8) via an ultrasonic converter (7) is movable, characterized in that the ultrasonic converter (7) within the frame (13) via a sound conductor (11) on a holder (12) to the carrier (8) is connected and the holder (12) via a plurality of struts (14) with the frame (13) is connected.

Description

The present invention relates to a sifting machine for separating a powdered material, comprising an inlet for the powdery material, a screen held on a carrier, a first outlet for the oversize and a second outlet for the good grain which has fallen through the screen, the carrier comprising a frame comprises, on which the screen is stretched, and the carrier is movable via an ultrasonic converter, and a method for screening of powdered material in a screening machine.

The DE 10 2006 047 592 B4 discloses an apparatus for cleaning a sieve fabric enclosed in a sieve frame by means of ultrasound, in which an ultrasound converter excites the sieve to vibrate via a sound conductor arranged on the movable part of the sieve frame. Here, the sound conductor is performed decoupled by the upper part. Such ultrasonic converters can clean the screen by the movement, with the struts only locally stimulating the screen.

It is therefore an object of the present invention to provide a screening machine, by means of which improved cleaning of a screen is made possible, and to provide a method for sifting powdered material, which enables effective screening.

This object is achieved with a screening machine having the features of claim 1 and a method having the features of claim 13.

In the screening machine according to the invention, the powdery material is placed on a sieve, which is stretched on a support, wherein the carrier has a frame and a holder arranged within the frame, to which an ultrasonic converter is connected via a sound conductor, wherein the holder via a plurality of struts connected to the frame. By this design of the carrier, the ultrasonic converter can clean the screen in a larger area, since the carrier is driven and the movement of the carrier is introduced into the screen via different areas. This allows the ultrasonic converter to clean the screen over a large area.

The carrier is preferably plate-shaped with openings on which the wire is at least partially tensioned. The screen and the carrier can be formed rectangular in plan view, wherein the carrier preferably projects beyond the screen on one end face, and on the protruding portion an opening for disposing of the oversize is formed to the outlet for the oversize. Alternatively, the opening for disposing of the oversize may not be formed inside the frame of the carrier but outside.

For a simple production of the carrier, this may preferably be formed in one piece, for example from a metal sheet, in particular from a steel sheet. The thickness of the carrier may for example be between 1.5 mm to 5 mm, preferably 2 to 4 mm, so that the sieve is stably supported by the carrier. The sieve can be fixed by gluing to the carrier.

From the central holder preferably a plurality of struts extend star-shaped to the frame, in particular four to eight struts may be provided for connecting the central holder to the outer frame. The holder can be provided exactly at a symmetrical center of the carrier, but also an off-center arrangement within the frame is possible.

The screening machine preferably additionally comprises a conveyor drive for conveying the powdered 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 to promote the powdery material on the screen in small steps from the inlet to the first outlet, if it does not fall through the screen. As a result, overlap the movements of the conveyor drive and the movement of the screen through the ultrasonic converter for cleaning the screen.

The sieve can be designed, for example, for separating pulverulent material, in particular metal powder, for example aluminum powder for 3D printers. The openings of the screen may have an extension of, for example, between 10 .mu.m and 200 .mu.m, in particular between 50 .mu.m and 100 .mu.m, in both directions, although the size of the openings depends on the specific application.

In the method according to the invention, the powdery material is supplied to an inlet and placed on a strainer held on a support. The screen is moved to convey the powdery material, in addition, the screen is cleaned by an ultrasonic converter. The ultrasonic converter is connected in plan view in a central region on a holder to the carrier, so that the powdery material is divided. The good grain fallen through the screen is removed at a second outlet, while the oversized grain conveyed across the screen is removed at a first outlet.

• 1 eine perspektivische Ansicht einer erfindungsgemäßen Siebmaschine;
• 2 eine Schnittansicht durch die Siebmaschine der 1, und
• 3A und 3B zwei Ansichten eines Trägers der Siebmaschine der 1.

The invention will be explained in more detail below with reference to an embodiment with reference to the accompanying drawings. Show it:

• 1 a perspective view of a screening machine according to the invention;
• 2 a sectional view through the screening machine of 1 , and
• 3A and 3B two views of a carrier of the screening machine the 1 ,

A screening machine 1 for sifting a powdered material comprises an inlet 2 for feeding the powdery material onto a sieve attached to a carrier 8th is held. The screening machine 1 has a housing with a lower part 3 for collecting the sieved Gutkorns, wherein at the lower part 3 an outlet 10 intended for the good grain. The lower part 3 comprises a connecting part 4 , which is connected to a conveyor drive to the housing of the screening machine 1 to move and the powdered material on the screen from an inlet 2 to an outlet 9 to promote the oversize. Such a conveyor drive can promote the powdery material gradually on the screen.

The screening machine 1 includes one on the base 3 arranged cover or shell 5 , at the one or more viewing windows 6 are provided. The top 5 is sealed to the lower part 3 arranged, and the interior of the housing may be filled with a gas, in particular an inert gas.

Through the top 5 is also a sound conductor 11 performed, which is to clean the screen and with an ultrasonic converter 7 connected is. This is the sound conductor 11 decoupled by the shell 5 performed and with the carrier 8th firmly connected. The ultrasonic converter 7 can thus over the sound conductor 11 the carrier 8th move, on which the sieve is stretched, whereby the movements of the ultrasonic converter 7 and superimpose those of the conveyor drive.

In the 3A and 3B is the carrier 8th shown in detail. The carrier 8th formed in one piece and has a thickness between 1.5 mm to 5 mm, in particular 2 mm to 4 mm. The carrier 8th includes an outer frame 13 , which is rectangular in plan view and at least twice as long as it is wide. In a middle area of the frame 13 is a holder 12 provided, which is designed as a node and with the sound conductor 11 connected is. The holder 12 is centered in the frame 13 arranged and a variety of star-shaped struts 14 with the frame 13 connected. In the illustrated embodiment, six struts 14 from the holder 12 with the frame 13 provided, the number of struts 14 can vary, for example, four to eight struts 14 be provided. The sieve is on the carrier 8th cocked, in particular glued, and thereby both the struts 14 as well as on the frame 13 fixed. The sieve covers the carrier 8th not completely, but on one end face is an opening 16 formed on the to the holder 12 turned side by a crossbar 17 is limited. At this cross strut 17 is a frontal end of the screen fixed. This allows the oversize, which is conveyed on the screen, when crossing the crossbar 17 through the opening 16 in the outlet 9 fall for the oversize.

The powdery material is first in the inlet 2 entered, and promoted, for example, in an inert gas atmosphere. Then, the powdery material through the screen through the conveyor drive to the opening 16 promoted, with the smaller Gutkorn falls through the sieve and only the larger oversize in the opening 16 to the outlet 9 for the oversized grain is promoted. The sieve is easily clogged during the sieving process, so that through the ultrasonic converter 7 a cleansing is generated by the wearer 8th via the ultrasonic converter 7 is moved, which leads to a cleaning of the screen. The good grain which has fallen through the sieve is then passed over the outlet 10 further processed.

The carrier 8th with the screen is preferably oriented inclined to the horizontal, so that the powdery material is conveyed uphill on the screen. The angle of inclination of the carrier with the screen is, for example, in a range of 1 ° to 5 °, preferably 2 ° to 4 °.

Such a screening machine can be used for example for separating 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.

LIST OF REFERENCE NUMBERS

1

screening machine

2

inlet

3

lower part

4

connecting part

5

top

6

window

7

ultrasonic converter

8th

carrier

9

outlet

10

outlet

11

sound conductor

12

holder

13

frame

14

strut

16

opening

17

crossmember

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006047592 B4 [0002]

Claims (12)

A sifting machine (1) for separating a powdery material, comprising a powdered material inlet (2), a screen supported on a carrier (8), a first oversize outlet (9), and a second outlet (10) the sieve failed good grain, wherein the carrier (8) comprises a frame (13) on which the wire is stretched, and the carrier (8) via an ultrasonic converter (7) is movable, characterized in that the ultrasonic converter (7) within the frame (13) via a sound conductor (11) on a holder (12) to the carrier (8) is connected and the holder (12) via a plurality of struts (14) with the frame (13) is connected. Screening machine after Claim 1 , characterized in that the carrier (8) is plate-shaped with openings on which at least partially the wire is stretched. Screening machine after Claim 1 or 2 , characterized in that of the holder (12) four to eight struts (40) are connected in a star shape with the frame (13). Screening machine according to one of the preceding claims, characterized in that the carrier (8) is rectangular in plan view. Screening machine according to one of the preceding claims, characterized in that the carrier (8) is integrally formed. Screening machine according to one of the preceding claims, characterized in that the carrier (8) is made of a metal sheet. Screening machine according to one of the preceding claims, characterized in that a conveyor drive is provided to promote the powdery material on the screen linearly from the inlet (2) to the first outlet (9). Screening machine according to one of the preceding claims, characterized in that in the carrier (8) an opening (16) is formed, through which the oversize grain to the first outlet (9) can be conveyed. 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 °. Screening machine according to one of the preceding claims, characterized in that the carrier (8) has a thickness between 2 mm to 5 mm. 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 performed by an upper cover (5) of the housing. Screening machine according to one of the preceding claims, characterized in that the sieve has openings between 10 μ and 200 μ, in particular 50 μ to 100 μ.

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