DE10343645B4 - Method for sieving or sorting - Google Patents

Abstract

method for sieving or sorting screenings (2), preferably earth, sand or gravel, by means of a sieve arrangement (1), wherein the screenings in a closed on the outer circumference, on both end faces (8) open rotary screen (3) introduced and by rotational movement of a connected mixing machine depending on the size of Siebmaschen (4) below Gravitationally sieved and optionally in a container (5, 10) is caught under the rotary screen, characterized that this Screenings (2) in a first tilt position (A) with slightly against the Horizontal inclined, rotating rotary screen at the higher, open end not connected to the mixing machine (8) entered and in the direction of the also inclined mixing machine promoted and it is sieved that this is not sieved sieved material in the mixing machine (7) circulated, loosened and in particular is crushed, that then the mixing machine (7) together with rotary screen (3) in the opposite Direction in a second tilt position (B) is inclined so that the rotational opening (11) the mixing machine with rotary screen after ...

Description

The The invention relates to a method for screening or sorting screenings, preferably earth, sand, or gravel, wherein the screenings in a the shell circumference closed, on both front sides open rotary screen introduced and by rotary motion of a connected mixing machine depending on the size of the sieve mesh sieved by gravity and optionally in one container is caught under the rotary screen.

To The prior art is known Siebanordnungen with an oblique sieve grid. An operator shovels screenings such as soil, sand or the like on the weird stationary Sieve grid, wherein the screenings on the one hand when shoveling on the one hand penetrates through the screen grid and on the other hand by the inclination the Siebgitters down the sieve grid and thereby circulated and partly relaxed and reduced and at the same time on is sieved through the sieve screen.

Also one knows in plan view rectangular or round vibrating screens with and without peripheral edge. The screenings are placed on the vibrating sieve shoveled and by shaking motion sieved. The shaking motion done by an operator by hand, but also by machine Drive the vibrating screen, which then automatically performs an oscillation movement.

In particular, are out DE 200 14 107 U1 and DE 69 29 772 U1 Sieve arrangements are known, which allow a screening or sorting in the manner mentioned above with the help of an already commercially available (concrete) mixing machine, which generates the rotary motion for the rotary screen during operation. This can be dispensed with a separate drive of the screen.

task The invention is enriched by the prior art Creation of a method for screening or sorting the entrance mentioned type, which with amazingly simple Means an effective screening and / or sorting screenings allows.

Is solved the problem underlying the invention by a method with the features of claim 1, advantageously further developed by the means according to the claims 2 and 3.

being the screening method according to the invention is that the Screened material in a first tilt position slightly at the horizontal tilted, rotating rotary screen at the higher, open end not connected to the mixing machine and in the direction of the also inclined mixing machine promoted and it is sieved that the non-screened screening material circulated in the mixing machine, gelokkert and in particular is comminuted, that then the mixing machine together Rotary screen in the opposite direction to a second tilt position so inclined that the rotation opening the mixing machine incl. rotary screen is inclined downwards and the screenings independently releases, and that at self-employment of the circulated Screened material from the mixing machine with promotion of the screenings again through the rotary screen the screenings further sieved and optionally in a first container is caught, and finally the non-sieved coarse-grained Remainder of the material to be screened at the front open low-lying end the rotary screen issued and sorted out and if necessary caught in another container becomes. Of course can the container (s) also by wheelbarrows, conveyor belts or be replaced.

By the operation of the invention a rotary screen in a connection to a mixing machine can the mixing machine in addition to the function of power transmission of the rotary motion be used on the rotary screen itself as a screen additional unit. In particular, the mixing machine for introducing Siebgut in the mixing drum of the mixing machine for the purpose of a post-treatment used by those screenings that are not sieved by the Mantel of the rotary screen has arrived, that of the screenings, which is problematic, especially grainy and / or lumpy. According to the invention is thus a known concrete mixer with a connected rotary screen another function (crushing, reversing) supplied, wherein a double treatment in a rotary screen is possible, depending on the state the technology is not possible is.

In particular, the rotary screen can be continuous or discontinuous, in particular intermittent rend, be driven in one direction.

Also can the direction of rotation of the rotary screen during a sieving process be switched.

The Rotary sieve is with one of its open end faces to the rotation opening of Blending machine coaxially connected, in particular releasably flanged or infected, and is powered by the blender.

The Mixing machine can internal ribs for crushing coarse screenings exhibit.

Also the rotary screen may preferably have coaxial inner ribs on the Inner circumference of the sieve sheath for a better circulation process of the screened material.

The In particular, rotary screen may be cylindrical or conical or frustoconical or be formed in cross-section in polygonal shape.

The Inclination of the rotation axis of the rotary screen can be changed and In particular, the inclination of the sieve stepless or gridded set become.

The Invention will now be described with reference to an embodiment with reference on the attached Drawings closer explains; show it:

1 a screen assembly with a rotary screen in a connection to a mixing machine in a schematic diagram in an inclined first position for introducing the screenings, and

2 the sieve arrangement after 1 in an oppositely inclined second position for discharging the screenings.

According to the drawings is a sieve arrangement 1 for sieving or sorting screenings 2 , preferably earth, sand, gravel or the like, provided, wherein the screenings on a sieve 3 applied and by Siebbewegung depending on the size of Siebmaschen 4 sifted by gravity and sorted out and in a first and a second container 5 . 10 is caught under the sieve.

The sieve 3 is a closed on the circumferential circumference driven rotary screen with essentially horizontal axis of rotation 6 , wherein the inclination α of the axis of rotation 6 of the sieve 3 changed and in particular grid-like the inclination α of the sieve can be adjusted.

The sieve 3 is on both ends 8th open and cylindrical. It is a so-called drum lattice.

The shown embodiment is a to a commercially available known concrete mixer coaxially connected nes rotary screen, which is continuous or discontinuous, in particular intermittent, with equal time intervals, driven in a single direction of rotation or alternatively in the direction of rotation is switchable.

In particular, this is on both end faces 8th open sieve 3 with a front side coaxial with the opening 11 the rotary drum of a blender 7 releasably flanged over screws.

The blender 7 has inner ribs for crushing coarse screened material, as well as the sieve 3 itself preferably has coaxial inner ribs on the inner circumference of the screen shell.

During operation of the sieve arrangement 1 is according to 1 the screenings 2 in the direction of arrow P through the open right front side 8th of the sieve 3 in a slightly inclined to the horizontal first tilt A of the screen 3 along with mixing machine 7 in particular manually entered by shoveling, by rotation of the screen 3 circulated and in the lower first container 5 sieved. The screenings that are not or not yet screened pass due to the inclination of the axis of rotation 6 on the sieve in the direction of the mixing machine and is further circulated through the screen due to the axial flow and sieved with practically adjustable dwell or sieving time. The non-sieved screenings enter the mixing machine 7 and is there circulated, loosened and in particular crushed.

After that, the mixing machine 7 besides sieve 3 in the opposite direction in a second tilt position B according to 2 so inclined that the opening 11 The mixing machine is tilted together with the screen down and releases the screenings independently. When independently discharging the circulated material to be screened 2 from the blender 7 with promotion of the screenings again through the sieve 3 the screenings are further sieved and this screenings in the first container 5 collected.

Finally, the non-sieved coarse-grained residue 9 of the screening material at the front open low-lying end face 8th of the sieve and sorted out and in the second container 10 collected.

So it's going to be a sieve 3 a drum-shaped grid of any mesh size with a detachable connection at the opening 11 attached to the mixer drum.

Siebbares Good is introduced into the rotating drum grid.

The sieving process takes place by the rotation of the mixing machine 7 with the attached drum grid both during the introduction of the screenings 2 as well as when emptying the mixer.

The Insertion and removal is due to the inclination of the mixing machine drum controlled.

The inclination the mixing machine drum, which can be set to grid controls the screening process and thus the residence time of the screenings in the drum grid.

optional attached adjustable ribs on the drum inside serve to increase the efficiency of sieving.

One optionally installed reversing switch brings an additional Variation of the sieving process.

Not sorted screened material ends up in the mixing machine drum when inserted and is loosened and crushed there.

The Loosening or comminution in the mixing machine increases the proportion sorted screening material, which, for example, tubers or Sortiergut can be, which larger parts adheres.

The following data or features have proved to be particularly advantageous. Dimensions for the drum grid (all figures in mm): Length: 500 Diameter: 400 Drum grid mesh size: 3 × 3 Thickness of drum grid wire: 2 Speed n: 20 rpm (speed of the concrete mixer) Dimensions for the internal ribs of the concrete mixer (all figures in mm): Length: 300 Height: 30 Width: 20

to longitudinal axis of the drum grid can be attached several ribs.

To many ribs in the drum grid prevent rolling / slipping of the sieve or bulk material and reduce the Siebaustrag. It has been found that preferably two ribs in the above-mentioned drum grid an optimal Siebaustrag cause.

The Rib size is relative to see the drum grid. She changes with the size of the drum lattice.

The Insertion and removal of the screenings can

a) take place one after the other

in this connection is the introduction or deployment by the tilt of the Drum grid to the longitudinal axis or the direction of rotation of the drum grid and the spiral effect of aslant controlled ribs.

(Example: mounting the drum grille on a concrete mixer)

b) take place continuously

The Drum grille is open on both sides.

The Sieve material is introduced on one side and travels through the drum grid and leaves on the other side.

Of the Drive (rotation or rotation with vibration) is not at the end of the drum at the open end, but preferably along the Drum grid in the jacket area on top of the drum grid.

Claims (3)

Method for sieving or sorting screenings ( 2 ), preferably earth, sand or gravel, by means of a sieve arrangement ( 1 ), wherein the screenings in a closed on the shell circumference, on both end faces ( 8th ) open rotary screen ( 3 ) and by rotation of a connected mixing machine depending on the size of Siebmaschen ( 4 ) by gravity and optionally in a container ( 5 . 10 ) is collected under the rotary screen, characterized in that the screenings ( 2 ) in a first inclination (A) with slightly inclined to the horizontal, rotating rotary screen at the higher, open, not connected to the mixing front ( 8th ) and conveyed in the direction of the also inclined mixing machine and thereby sieved that the non-sieved screenings in the mixing machine ( 7 ) is circulated, loosened and in particular crushed, that then the mixing machine ( 7 ) together with rotary screen ( 3 ) in the opposite direction in a second tilt position (B) is inclined so that the rotational opening ( 11 ) of the mixing machine together with rotary screen is inclined down and releases the screenings independently, and that when independently discharging the circulated screenings ( 2 ) from the mixing machine ( 7 ) with promotion of the screenings again through the rotary screen ( 3 ) the screenings are further sieved and optionally in a first container ( 5 ) and finally the non-sieved coarse-grained residue ( 9 ) of the screenings at the front open low-lying end face ( 8th ) of the rotary screen and sorted out and optionally in another container ( 10 ) is caught. Method according to claim 1, characterized in that the rotary screen ( 3 ) is driven continuously or discontinuously, in particular intermittently, in one direction of rotation. Method according to claim 1, characterized in that the direction of rotation of the rotary screen ( 3 ) is switched in a screening process.