SK17795A3 - Screening panel and method of manufacturing the screening panel - Google Patents

Abstract

The sieve plate comprises holes whose axes are inclined to the plane of the plate. The sieve plate has lines (2-5) and along the longitudinal direction of each line, it has wave-shaped peaks (6,6',9,9') and troughs (7,7',10,10') which join to each other. In particular holes (11) are formed by aligning peak (6) and trough (7) portions of sinusoidal indentations, which perforate the plate, in adjacent rows.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a sieve plate having holes arranged obliquely with respect to the plane of the sieve plate for plane sieves or sieve drums and sieve baskets. The invention further relates to a method of manufacturing a sieve plate.

Sieve plates are used for sorting bulk material and for grinding or crushing plastics. The screen plates * are left from their basic planar form either in the form of a planar screen or rolled into a cylindrical casing, so that • a screen drum or screen basket is formed. These strainer baskets are used, for example, in conditioning machines for treating the starting material in the manufacture of bricks for grinding, mixing and homogenizing building ceramics, in particular clay with additives. The strainer baskets cooperate with multi-arm spreaders which rotate inside the strainer baskets and press the material against the screen wall.

BACKGROUND OF THE INVENTION

Perforated screens with holes arranged perpendicular to the plane of the screen plate and perforated screens with holes oriented obliquely to the plane of the screen plate are known. Sieves with oblique holes are referred to as grating screens or, in the case of a cylindrical screen, as grating drums.

The sieve plates with holes oriented obliquely to the plane of the sieve plate are provided with elevations which have semi-circular holes on the front side and which continuously extend into the plane of the sieve plate. However, this hole pattern is not ideal. The number of holes lV- m per unit is small. If the holes were to be circular in shape, these ridges would have to be considerably higher, but this would lead to great wear of the screen.

DE-AS 17 57 920 discloses a screen basket for impact crushers or hammer crushers, in particular for grinding wood chips for the production of chips. This screen basket consists of screen plates wound into a cylindrical shape with slots arranged obliquely to the longitudinal or rotation direction, having the form of elevations extending from the plane of the screen. In a perspective view, the impression of a metal grid or expanded metal plate with ventilation slots is created.

*

These slots are longitudinal and have a lower edge which lies in the plane of the sieve plate. The upper edge of each slot forms a straight edge, which can additionally be sharpened. Such a sieve basket replaces the knives that need to be constantly grinded and adjusted again, which are known in the annular splitters.

DE-A-35 35 035 discloses a sieve device by means of which, for example, certain fish can be sorted out of the total number of fish caught during fishing. For this purpose, a drum is used which is provided on its jacket surface with tangentially arranged openings sized for a particular species of fish. In a further embodiment, circular openings are provided in the circumferential direction one behind the other, which are separated in the axial direction by means of partition walls. The density of holes per unit area is small. In yet another embodiment, in particular of the screen plates, the outward and inward curves alternate in succession, whereby circular openings are formed at the interfaces or transition points respectively. The vibrating screen according to U.S. Pat. No. 5,108,589 is used for sorting, which consists of sheets which are flaky overlapping and which are provided with finger-shaped incisions at their overlapping ends. However, a grating or grinding effect is not achieved with this embodiment. With the aforementioned / in the apparatus, it is also not possible, in particular with good efficiency, to achieve the desired grinding and, optionally, homogenization of certain materials, such as building ceramics, or the grinding of polystyrene parts into fine bulk material.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a screen plate of the kind described in the introduction which can be rolled into a screen drum and can be used for screen baskets to form cylindrical or polygonal, for example hexagonal or octagonal holes. the density of these holes per unit area of screen.

SUMMARY OF THE INVENTION

This task is accomplished by a sieve plate with holes arranged obliquely with respect to the plane of the sieve plate for planar sieves or sieve drums and strainer baskets, according to the invention, which is characterized in that the sieve plate is provided with successive rows with in the direction of each row that there is always one * * recess adjoining it in the longitudinal direction z

the spacing that the ridges and depressions directly adjacent to each other are always offset by one another in the longitudinal direction of the rows and that the apex of each ridge of one row extends to the bottom of the depressed row directly in one direction, being formed on both sides of the passages holes, always enclosed by one of the

a ridge and one depression.

ridge and line form

By combining the ridges and depressions in the rows and phase-shifting the rows relative to each other, the ridges and depressions are arranged such that a depression is arranged in front of each ridge. In the case of the tunnel or annular shape of the ridges or depressions, holes are formed which are approximately circular in shape. The particular geometry of the sieve plate, in particular the defined position of the elevations, means a dense sequence of holes, thereby efficiency.

and depressions with respect to each other, achieved a great degree

Advantageously, the ridges and depressions have, in the transverse direction to the rows, surface surfaces which are formed by forming lines that follow the wine line. The ridges and depressions are then formed by cylindrical surfaces, which plastics so that through the holes it may be possible to reduce the drive power of the clay processing machines or the manufacture of bricks. Approximately when they are pressed onto the screen, they are deformed particularly easily. In this way, the rotary rippers are similar in, for example, the tangential arrangement of the cylindrical surfaces and the axes of the holes, reducing the power loss and saving the screen. As mentioned above, the rows and depressions are directly opposite each other, wherein the phase displacements and the flaky or tiled, respectively half-pitched oblique position of the ridges and depressions with respect to the plane of the screen form gradients or are preferably designed such that the transition from the bottom the depression is formed seamless.

summit ridge to

According to a particularly preferred embodiment, the ridges in the part of the apex which lies opposite the transitions to the bottom of the depressions are provided with a flattening. Particularly when using a screen together with scarifiers which are guided along the surface of the screen, it is advantageous to make these flats. By creating these flattenings, the friction resistance during operation of the screening device is reduced.

According to a preferred embodiment, each ridge and each depression is bounded by a two-sided, open cylindrical surface based on a circular arc, for example a semicircle or polygon, for example a hexagon or octagon, and the holes are substantially circular or polygonal in shape. The sieve holes, which are approximately circular in shape, and which have a grooved inlet that passes directly into the hole, increase the sieve efficiency.

According to the present invention, a method of making sieve plates which is simple, quick and inexpensive is to cut into the sheet metal at a distance from each other slots following the upper and lower edges of the parallel rows and passing through the sheet thickness. opposite the slot of one row lies the spacing of the other row, and that each slot opens on its one side by a tunnel-like elevation led obliquely to the sheet metal plate and a groove-like depression on its other side into an approximately circular or polygon-shaped hole. The slit opens as a result of the pressing acting on both sides at its edge perpendicular to the plane of the sieve plate. Sharp edges are formed, but are highly desirable. Furthermore, a rigid finished product is formed by the shape stability of this embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawing, in which: FIG. 1 shows a part of a sieve plate as seen in the direction of the axes of the holes, FIG. 1a shows a variant of this embodiment, FIG. 2 shows a section along line II-II in FIG. 1, FIG. 3 is a perspective view of the screen plate of FIG. 1 and FIG. 4 is a cross-sectional view of the screen plate of FIG. 2, but in a useful position for a flat screen.

DETAILED DESCRIPTION OF THE INVENTION

Parallel lines 2, 3, 4, 5 are formed in the sieve plate 7, in which ridges 6 and depressions 7 lie next to each other, followed by ridges 6 'from depressions 7', etc., so that they occur along each row 2, 3, 4, 5 a wavy line in the shape of a sunflower. One ridge forms a spacing 8 with the following depression 7 in row 2. The ridge 9 and depression 10 of the respective adjacent row 3 are followed by ridge 9 * and depression to 10 *. they are offset by a half of the spacing 8 relative to the spacing 8 in the row 2. This phase shift applies in the same sense from row to row, so that a pattern similar to the offset corrugated sheet metal strips is formed.

Between each elevation 9, 9 'and each hole 11 of the recess with the recess 7, 7 * of the row 2 of the row 3, one which is bounded by the edge edges of said

7, 7 'and elevations 9, 9 *. The ridges 6, 6 'of the row 2 pass directly into the depressions 10, 10'. In FIG. 3 shows a smooth transition between the elevation 6, 6 'and the depression 10 by a dashed line at the top of the depression 6' and at the bottom of the depression 10.

slits are pressed into the sheet metal on the rows, each of them being shifted in phase

This geometry results from the top and bottom margins of the intended edges being edge-to-edge half-spaced 8. The edge portion of each slot is pushed upwards on one side of the slot and pushed down on the other side of the slot using compression tools, which create obliquely arranged f

the ridges 6, 6 'and 9, 9' and the inclined depressions 7, 71 and 10, 10 '.

The coherence of the lines 2, 3, 4, 5 together results from the creation of transitions or bridges, respectively, between the holes 11. These x

transitions from the top of the ridges 6, 6 'of row 2 to the bottom of the depressions

10 * into line 3 (FIG. 3) causes a stepped shape of the sieve plate 1 as shown in FIG. Second

However, since the sheet metal processing is carried out by the machine in the horizontal position and with the slanting faces of the dies in the forming orifice, the formation according to FIG. 4, which represents portions of the screen plate 1 in a useful position. The directions of the axes of the holes 11 form an acute angle with their projection to the plane of the sieve plate 1 and the holes 11 are oriented tangentially to a certain extent. Thus, a sieve drum with conventional perpendicular holes can be referred to as a radially perforated sieve drum, optionally a radial sieve and a sieve drum with sieve plates rolled into a cylinder according to the invention of a "tangential sieve".

When the mass is pushed through the scarifiers guided along the screen wall as a squeegee, this mass is pushed in the tangential direction through the holes 11 with very little friction. Fig. 4 shows the situation of the screen plate 7 according to the invention in the position in which this extrusion is performed. The spreading or spreading is carried out above the screen plate from left to right, or on the screen drum, which is formed by the winding of the screen plate 7, the rotation of, for example, a three-arm ripper is counterclockwise.

the spreading edge and the material, however, has the material calved

The spreading can be further facilitated and the efficiency further improved when the ridges are 6 ''. see fig. 4, provided with a flattening 12. As a result, the spreading edge of the spreading device slides closer to the surface of the sieve plate X. It is to be noted that for the homogenization and processing of plastics for the production of ceramics or bricks it is not desirable to fully approach the surface of the sieve drum. Homogenized to escape through the holes 11 and, on the other hand, the rest is further conveyed along the groove-like depressions, and finally only after it has been homogenized is pushed through one of the holes 11 following in the longitudinal direction of the screen or in the circumferential direction of the screen drum.

In FIG. 1 and 3, the ridges 6, 6 * and 9, 9 * and the depressions 7, 7 'and 10. 10 * are bounded by areas with parallel lines forming a wavy line which is made up of circular arcs, for example in the form of semi-circles upwards , and the following semicircles below. The ridges and depressions may also follow the shape of the polygon, for example upwardly facing hexagonal or octagonal halves, followed by just such hexagonal or octagonal halves facing downwards. This variant is shown in FIG. Ia.

The inclination angle cf (FIG. 4) of the inclined position of the elevations 6, 6 'and 9, 9' and the depressions 7, 7 * and 10, 10 'relative to the plane of the screen plate 7 is selected depending on the peripheral speed of the screen drum. The higher this circumferential speed, the smaller the angle α is chosen.

Claims (6)

PATENT CLAIMS A sieve plate with holes arranged obliquely with respect to the plane of the sieve plate for planar sieves or sieve drums and strainer baskets, characterized in that the sieve plate (I) is provided directly with successive rows (2, 3, 4, 5) with corrugated ridges (6, 6 ', 9, 9') and recesses (7, 7 *, 10, 10 *) adjoining each other in the longitudinal direction of each row (2, 3, 4, 5) that in each case a ridge (6, 6 ', 9, 9') and a depression (7, 7 ', 10, 10 *) adjoining it in the longitudinal direction of the row form a spacing (8) that the ridges (6, 6', 9, 9 ') and the depressions (7, 7', 10, 10 ') of the directly adjacent rows (2, 3, 4, 5) are always offset relative to each other in the longitudinal direction of the rows (2, 3, 4, 5) o half the spacing (8), and that the apex of each ridge (6, 6 *, 9, 9 ') of one row (2, 3, 4, 5) passes to the bottom of the depression (7, 7 ', 10, 10') of a row (2, 3, 4, 5) directly adjacent in one direction, with holes (II) formed on both sides of the passages, each bounded by one ridge (6, 6 ', 9, 9' ) and one depression (7, 7 ', 10, 10'). Sieve plate according to claim 1, characterized in that the ridges (6, 6 ', 9, 9') and depressions (7, 7 ', 7 ', 10, 10') have transverse to the rows (2, 3, 4, 5) of the surface, which are formed by lines forming a wavy line. Sieve plate according to claim 1 or 2, characterized in that the transition from the top of the ridge (6, 6 ', 9, 9') to the bottom of the depression (7, 7 ', 10, 10') is smooth. A sieve plate according to any one of claims 1 to 3, characterized in that the ridges (6 * ') are in the part of the apex facing the transitions to the bottom of the depressions (10). Pl · '- r ?? fw provided with flattening (12). A sieve plate according to one of claims 1 to 4, characterized in that each ridge (6, 6 ', 9, 9') and each depression (7, 7 ', 10, 10') is bounded on both sides by an open a cylindrical casing surface based on a circular arc, for example a semicircle or a polygon, for example, a hexagon or an octagon, and the holes (11) have a substantially circular or polygonal edge. A method of manufacturing a sieve plate according to any one of claims 1 to 5, characterized in that slits following the upper and lower edges of the parallel rows are pressed apart from each other and passing through the sheet thickness, the slits of the adjacent rows are phase shifted the gap of one row is spaced from the other row, and that each gap opens on its one side by a tunnel extending obliquely to the sheet metal plate and a groove depression on its other side into an approximately circular or polygon-bounded hole.