DE20314575U1 - Sieve assembly comprises driven rotary sieve closed on outer circumference and with horizontal rotational axis, the inclination of which is adjustable, and with it, inclination of sieve - Google Patents

Abstract

The sieve assembly (1) comprises a driven rotary sieve (3) closed on the outer circumference and with a horizontal rotational axis (6), the inclination (alpha ) of which is adjustable, and with it, the inclination of the sieve. The sieve may be open on one or on both ends. The sieve is cylindrical, conical or truncated-conical in construction or may be polygonal in cross section. The sieve has a motor as the rotational drive, and may be driven continuously or intermittently.

Description

Sieve arrangement

The invention relates to an arrangement for sieving or sorting screening material, preferably earth, sand, gravel or the like, wherein the screening material is applied to a sieve and, depending on the size of the sieve mesh, is sieved or sorted out by sieving movement under the influence of gravity and, if necessary, is collected in a container or the like under the sieve.

According to the state of the art, sieve arrangements with an inclined sieve grid are known. An operator shovels material to be sieved, such as earth, sand or the like, onto the inclined stationary sieve grid, whereby the material to be sieved, on the one hand, immediately penetrates through the sieve grid when being shoveled up and, on the other hand, trickles down the sieve grid due to the inclined position of the sieve grid and is thereby circulated and partly loosened and reduced in size while being sieved further through the sieve grid.

Rectangular or round vibrating screens with and without a peripheral edge are also known from a top view. The material to be screened is shoveled onto the vibrating screen and screened by a vibrating movement. The vibrating movement is carried out by an operator by hand, but also by a mechanical drive of the vibrating screen, which then automatically carries out an oscillating movement.

The object of the invention is to enrich the state of the art by creating an arrangement for sieving or sorting of the type mentioned at the beginning, which enables effective sieving and/or sorting of sieved material with astonishingly simple means.

The object underlying the invention is achieved by a sieve arrangement with the features of claim 1, advantageously further developed by the means according to claims 2 to 10.

The essence of a sieve arrangement according to the invention is that the sieve is a driven rotary sieve closed on the circumference of the casing with an essentially horizontal axis of rotation. It is therefore not a flat vibrating sieve, as in the prior art, but a closed sieve with a circular, oval or polygonal cross-section, which sieves the sieved material introduced at the front by rotating around the essentially horizontal axis of rotation while circulating it. It goes without saying that the rotary sieve is mounted so that it can rotate in a stand and is arranged at a distance from the ground so that sieved material can be collected or piled up under the sieve.

Preferably, the inclination of the rotation axis of the sieve can be changed and in particular the inclination of the sieve can be adjusted continuously or in a grid.

The rotary screen can be open not only on one end, but also on both ends, and in particular can be cylindrical or conical or frustoconical.

In a particularly simple variant, the rotary movement of the rotary screen is generated by an operator himself, for example by a pedal drive by pressing a pivoting foot pedal like a scooter or a pedal-operated sewing machine, although electric drive is preferred.
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The sieve can be driven continuously or discontinuously in a single direction of rotation.

However, the direction of rotation of the sieve's rotary drive can also be switched.

A particularly preferred variant of a sieve arrangement is characterized in that a sieve which is open on both ends is connected with one end to the opening of a known (concrete) mixing machine, in particular detachably flanged, plugged or clipped on, and is driven by the mixing machine.

The mixer can have internal ribs for crushing coarse screenings.
10

The sieve can also preferably have coaxial inner ribs on the inner circumference of the sieve shell for a better circulation of the sieved material.

The sieve arrangement according to the invention is preferably operated in such a way that the material to be sieved is not only fed through an open front side of the sieve and circulated and sieved by rotating the sieve, but also by changing the inclination of the axis of rotation or by tilting the axis of rotation, an axial conveyance of the material to be sieved that has not been or has not yet been sieved is set up through the sieve and the material to be sieved is further circulated and effectively sieved, ultimately with adjustment of the sieving time.

It is particularly useful if, when the sieve is arranged in a coaxial connection to a known (concrete) mixing machine, the screening material is fed into the higher, open front side not connected to the mixing machine in a first tilted position with the rotating sieve slightly tilted against the horizontal and conveyed in the direction of the mixing machine, which is also tilted, and is thereby sieved, the non-sieved screening material is circulated, loosened and in particular crushed in the mixing machine, then the mixing machine together with the sieve is tilted in the opposite direction into a second tilted position so that the opening of the mixing machine together with the sieve is tilted downwards and the screening material is released automatically, and when the sieve is discharged automatically

the circulated screenings from the mixing machine are conveyed through the screen again, the screenings are further screened and optionally collected in a first container, and finally the non-screened coarse-grained remainder of the screenings is discharged and sorted out at the front, open, low end of the screen and optionally collected in a further container, the further container being arranged in addition to a first container under the screen which collects the screened screenings. Of course, the container or containers can also be replaced by wheelbarrows, conveyor belts or the like.

The invention is explained in more detail below using an embodiment with reference to the accompanying drawings, in which:

Figure 1 shows a sieve arrangement with a rotary sieve in a connection to a mixing machine in a schematic diagram in an inclined first position for introducing

of the screening material, and

Figure 2 shows the screening arrangement according to Figure 1 in an oppositely inclined second position for discharging the screening material.

According to the drawings, a sieve arrangement 1 is provided for sieving or sorting screening material 2, preferably earth, sand, gravel or the like, wherein the screening material is applied to a sieve 3 and is sieved or sorted out by sieving movement depending on the size of the sieve mesh 4 under the influence of gravity and is collected in a first and a second container 5, 10 under the sieve.

The screen 3 is a driven rotary screen closed on the circumference of the casing with essentially horizontal rotation.

tation axis β, whereby the inclination α of the rotation axis β of the sieve 3 can be changed and in particular the inclination α of the sieve can be adjusted in a grid-like manner.

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

While in variants not shown the rotary movement of the rotary screen can be generated by an operator, for example by a foot pedal drive or by a connected commercially available electric motor, the embodiment shown is a rotary screen coaxially connected to a commercially available known concrete mixer, which is driven continuously or discontinuously, in particular intermittently, with equal time intervals, in a single direction of rotation or alternatively can be switched in the direction of rotation.

In particular, the sieve 3, which is open on both end faces 8, is coaxially flanged with one end face to the opening 11 of the rotary drum of a mixing machine 7 in a detachable manner via screws and is driven by the mixing machine.

The mixing machine 7 has inner ribs for crushing coarse screening material, just as the sieve 3 itself preferably has coaxial inner ribs on the inner circumference of the sieve shell.

During operation of the sieve arrangement 1, according to Figure 1, the screening material 2 is fed in the direction of arrow P through the open right-hand front side 8 of the sieve 3 in a first tilt position A of the sieve 3 and the mixing machine 7, which is slightly inclined to the horizontal, in particular manually by shoveling, circulated by rotating the sieve 3 and sieved into the lower first container 5. The screening material that has not been or has not yet been sieved is directed towards the mixing machine due to the inclined position of the rotation axis 6 on the sieve and is fed into the mixing machine due to the axis

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The material is then circulated further through the sieve and practically sieved with an adjustable dwell or sieving time. The non-sieved material is fed into the mixing machine 7 and is circulated, loosened and, in particular, crushed. 5

The mixing machine 7 and the sieve 3 are then tilted in the opposite direction into a second tilt position B according to Figure 2 so that the opening 11 of the mixing machine and the sieve is tilted downwards and automatically releases the sieved material. When the circulated sieved material 2 is automatically discharged from the mixing machine 7 and the sieved material is conveyed through the sieve 3 again, the sieved material is further sieved and this sieved material is collected in the first container 5.

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

Thus, a drum-shaped grid with any mesh size is used as sieve 3 and is attached to the opening 11 of the mixing machine drum with a detachable connection.

Screenable material is fed into the rotating drum grid.

The screening process is carried out by the rotation of the mixing machine 7 with the attached drum grid both when introducing the material to be screened 2 and when emptying the mixing machine. 30

The loading and unloading is controlled by the inclination of the mixing machine drum.

The inclination of the mixing machine drum, which can be adjusted in a grid, controls the screening process and thus the residence time of the screening material in the drum grid.

Optionally attached adjustable ribs on the inside of the drum serve to increase the efficiency of screening.

An optionally installed rotation direction switch provides additional variation in the screening process. 10

Unsorted screenings end up in the mixing machine drum where they are loosened and crushed.

The loosening or crushing in the mixing machine increases the proportion of sorted screening material, which can be, for example, earth tubers or sorting material that adheres to larger parts.

The following data or features have proven to be particularly advantageous and should enjoy invention protection in combination with a very individual design variant:

Dimensions for the drum grille (all dimensions in mm): Length: 500

Diameter: 400

Drum mesh size: 3x3 Drum mesh wire thickness: 2

Speed &eegr;: 20 rpm (speed of the concrete mixer)

Dimensions for the inner ribs of the concrete mixer (all dimensions in mm):

Length:

Height:

Width: 5

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

Too many ribs in the drum grid prevent the screening or bulk material from rolling off and reduce the screening discharge. It has been shown that two ribs in the drum grid specified above are the best way to achieve optimum screening discharge.

The rib size is relative to the drum grid. It changes with the size of the drum grid.

The loading and unloading of the screening material can take 20

a) take place one after the other

The introduction and removal is controlled by the inclination of the drum grid to the longitudinal axis or the direction of rotation of the drum grid and the spiral effect of the inclined ribs.

(Example: Attaching the drum grid to a concrete mixer) 30

b) be continuous

The drum grille is open on both sides.

The screening material is introduced on one side and travels through the drum grid and is separated on the other side.

The drive (rotation or rotation with vibration) is not located at the end of the drum on the open front side, but preferably along the drum grid in the jacket area on the top of the drum grid.

Claims (10)

1. Sieve arrangement ( 1 ) for sieving or sorting material to be sieved ( 2 ), preferably earth, sand, gravel or the like, wherein the material to be sieved is applied to a sieve ( 3 ) and is sieved or sorted out by sieving movement depending on the size of the sieve mesh ( 4 ) under the influence of gravity and optionally collected in a container ( 5 , 10 ) or the like under the sieve, characterized in that the sieve ( 3 ) is a driven rotary sieve closed on the circumference of the casing with an essentially horizontal axis of rotation ( 6 ). 2. Sieve arrangement according to claim 1, characterized in that the inclination (α) of the axis of rotation ( 6 ) of the sieve ( 3 ) is variable and thus the inclination (α) of the sieve is adjustable. 3. Sieve arrangement according to claim 1 or 2, characterized in that the sieve ( 3 ) is open on one or both end faces ( 8 ). 4. Sieve arrangement according to one of claims 1 to 3, characterized in that the sieve ( 3 ) is cylindrical or conical or frustoconical or has a polygonal cross section. 5. Sieve arrangement according to one of claims 1 to 4, characterized in that the sieve ( 3 ) has a motor as a rotary drive. 6. Sieve arrangement according to one of claims 1 to 5, characterized in that the sieve ( 3 ) is driven continuously or discontinuously, in particular intermittently, in one direction of rotation. 7. Sieve arrangement according to one of claims 1 to 7, characterized in that the rotary drive of the sieve ( 3 ) is switchable in the direction of rotation. 8. Sieve arrangement according to one of claims 1 to 7, characterized in that the sieve ( 3 ) which is open on both end faces ( 8 ) is connected with one end face to the opening ( 11 ) of a mixing machine ( 7 ), in particular detachably flanged or plugged on, and is driven by the mixing machine. 9. Screen arrangement according to claim 8, characterized in that the mixing machine ( 7 ) has inner ribs for crushing coarse screening material. 10. Sieve arrangement according to one of claims 1 to 9, characterized in that the sieve ( 3 ) preferably has coaxial inner ribs on the inner circumference of the sieve shell.