DE1278202B - Device for separating grainy material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 07b

German KL: 5Od -1/01

Number: 1278 202

File number: P 12 78 202.4-24 (L 56430)

Filing date: May 5, 1967

Opening day: September 19, 1968

For separating granular material according to the grain size, devices are known in which the Good z. B. fruits or other agricultural products, but also minerals, ores and semi-or Finished products of mechanical engineering is passed over sieve surfaces. The parts whose dimensions are smaller are than the holes in the sieve, are separated from the unsorted quantity in that they are separated by the Get holes and be collected in appropriate containers. The bigger parts will either further sorted in a subsequent device of the same type with larger holes or collected unsorted. Basically, the goods to be sorted are moved over the sieve. This can be done by the sorting device performing vibrating movements or a drum, whose inner surface is designed as a sieve, is rotated about an axis.

Depending on the weight of the granular material, i. H. both of the individual parts and that in the sorting device processing total amount, the sieve is sufficiently stable in the known devices executed that with wire screens, the wires made of a correspondingly resilient material with relative thick wire diameters can be selected. For middle tissue z. B. from the following table Open screen area in percent for different mesh sizes and wire thicknesses. An open sieve area of 75% is only possible for very light goods; values are general between 25 and 50% common.

Middle tissue

From the table it can be seen that the throughput of the goods to be sorted is due to high weight the required large wire thicknesses with a correspondingly small open screen area only relatively can be low.

The invention has a device for separating granular material according to the grain size on a Classification surface to the object, its cutting surface

75% Open sieve surface 50% 0.33 25% Mesh size 66VsVo Wire thickness 0.52 0.125 0.18 0.66 0.8 0.8 0.22 0.28 0.83 1.25 1.25 0.25 0.36 1.04 1.6 1.6 0.32 0.45 1.5 2.0 2.0 0.38 0.56 2.5 2.5 0.56 0.8 3.6 3.6

Device for separating granular material

Applicant:

Karl-Peter Luz,

1000 Berlin 42, Ankogelweg 61

Named as inventor:
Karl-Peter Luz, 1000 Berlin

formed by non-contiguous head surfaces of bodies and which are at a distance from the Classification surface are attached. According to the invention, the caliber rods are in a symmetrical structure in one thanks to the optimal ratio of open to closed proportion of 83% of the classification area given distance from each other, the head surfaces in two mutually perpendicular Directions have the same extent.

The invention allows machines that are used for sorting, either in relative short construction or higher performance can be achieved when sorting. aside from that the sorting can be carried out with higher accuracy, since also with large sieve areas the openings are not subject to change, such as B. the mesh of a wire screen by moving of wires; an unavoidable phenomenon of wear in known devices.

An embodiment of the invention can be constructed so that the caliber rods preferably run perpendicular to the sieve surface. The development of the formed by the head surfaces of the caliber rods Sieve surface can result in an image that is preferably two mutually perpendicular Axes of symmetry is uniform. The distance between the individual head surfaces can be in terms of both axes of symmetry be different, d. H. in the direction of movement of the goods to be sorted increase evenly or gradually, while the distances between the head surfaces are perpendicular to the direction of movement are constant for a certain grain size.

For machines in which granular material is separated according to the grain size in rotating drums, can, in the invention, the top surfaces of the caliber rods forming the sieve surface on a surface of rotation lie. This surface can be that of a cylinder or a conically expanding body.

809 617/284

While in known machines, the further movement of the goods to be sorted by a rotating spindles provided with a screw are made Rann, which runs on the sieve surface, can Embodiments of the invention be constructed so that only by rotation about the axis of rotation Sieve surface the movement of the granular material takes place. It can, for. B. with a cylindrical screen surface, the Axis of rotation be inclined. Can the goods to be sorted in a device without damage conveyed further by shaking movements, the movement of the granular material can also be carried out along a inclined sieve surface. This screen surface can be flat or curved in the invention, the above device associated axis of rotation may be horizontal or inclined.

Basically, in the invention, the open screen area has an optimal value, which is 83%, since z. B. with a distance of 1 cm between the caliber rods, i.e. a total area of 1 cm ² , ao the closed portion of the classifying area is represented by four quarters of the associated caliber rod head surfaces, i.e. (1 / 2-1) ² cm ² = 0 , 17 cm ² . A concave design of the boundary sides of the top surfaces only reduces the open portion to 78%, which is given by a circular area of π · 0.5 ² cm ² = 0.78 cm ² . In embodiments of the invention, the head surfaces of the caliber surfaces are therefore preferably square.

An embodiment of the invention is shown schematically in the drawing.

Fig. 1 shows a section from a classifying surface 1. A large number of non-contiguous head threads 2 with the edge length 5 forms the closed part of the classification area. The corresponding open portion 3 for a unit is approximate shown as a dashed circle with a diameter of 4.

At F i g. 2, the caliber rods 6 are attached to a rotationally symmetrical drum 7. The head surfaces 2 of the caliber rods 6 lie on a rotary classifying surface 1. The drum 7 can be rotated about its inclined axis 11. The granular material 12 still passes unsorted through the inlet 8 into the device. The undersized grain is collected behind the outlet 10, the oversized grain behind the outlet 9.

The F i g. 3 shows a cross section through the _S3m drum 7, on which the caliber rods 6 with the head surfaces 2 are arranged, running in the radial direction 50. Since the drum is seen from the side of the outlet 9, the inlet can be seen.

Claims (8)

Patent claims: 1. Device for separating granular material according to the grain size into oversize and undersize on a classifying surface, the cutting surface of which is separated by non-contiguous head surfaces of Bodies are formed which are fixed at a distance from the classifying surface, characterized in that, that in a symmetrical structure caliber rods (6), whose head surfaces (2) in two mutually perpendicular directions have the same size, in one due to the optimal ratio of open for a closed portion of 83% of the classifying surface (1) given distance from each other are arranged. 2. Apparatus according to claim 1, characterized in that the structure to two in the Classifying surface (1) lying, mutually perpendicular directions is symmetrical. 3. Apparatus according to claim 1 or 2, characterized in that the classifying surface (1) is a surface of revolution. 4. Apparatus according to claim 3, characterized in that the classifying surface around their Axis of rotation is rotatable. 5. Apparatus according to claim 1 or one of the following, characterized in that the Classifying surface (1) is inclined in at least one of its directions of symmetry. 6. Apparatus according to claim 1 or one of the following, characterized in that the Caliber rods (6) have their largest cross-section in the area of the classifying surface. 7. Apparatus according to claim 1 or one of the following, characterized in that the Head surfaces (2) are square. 8. Apparatus according to claim 1 or one of the following, characterized in that the Caliber rods (6) are preferably arranged perpendicular to the classifying surface (1). Documents considered: German Patent No. 1206 822; German utility model No. 1732751, 941160. 1 sheet of drawings 809 617/284 9.68 © Bundesdruckerei Berlin