SU973185A1 - Sieving surface - Google Patents

Description

one

This invention relates to the separation of solid materials by size and can be used in the coal, mining and industrial materials.

The known screening surface, which serves for the separation by size of a mixture of various sized pieces of material, consists of transverse grates, and, depending on the size of the grate, grates of various shapes are used.

The disadvantage of this screening surface is that it takes difficult grains.

The closest to the invention in terms of its technical essence and the effect achieved is the sifting over the top; - containing a frame in which transverse grate is fixed in steps. 20 made in the form of plates with parallel NK. P1 upper and tgzhey surfaces 2.j,

The lack of this surface is often contaminated.

The purpose of the invention is to intensify the sieving process by preventing the gaps between the grate from seizing.

This goal is achieved by the fact that the grate is installed obliquely, with the upper surface of the previous grate located in the same plane with the lower surface of the subsequent grate, and the grate is provided with stiffening ribs.

FIG. 1 shows a screening surface, a longitudinal section; in fig. 2 shows an embodiment of a screening surface with stiffeners / in fig. 3 - section of the screening surface.

The screening surface consists of the grates 1, fixed in frame 2, the grate 1 is equipped with stiffening ribs 3.

Claims (2)

The impressive surface works as follows. 397 The screening surface is mounted on the screen. When the material moves, coarse as well as difficult grains, the size of which exceeds or approximates c to the distance between the grate bars, since the height of the front upper edge of the next grate above the surface of the previous one less than 1/3 of the grain size has a center of gravity higher than the protruding edge of the grate is therefore a moment of force; such pieces are directed against seizing them in crevices and they move along the screening surface. For difficult grains, the size of which is smaller than the distance between the grates, the conditions for passage through the slot are facilitated by the fact that the angle of expansion of the gap with this fixing of the grates 1 is 9O or more. These grains enter the undersize product. Small grains brake the vehicle with protruding front edges of the grate and thus more quickly pass into the undersize product, increasing the sowing efficiency and productivity. In order to increase the transverse rigidity of the screening surface, the grate can be equipped with reinforcing ribs. In this case, the screening surface can be made of a corner profile material. Top n corner shelf facing the flow of the material being screened. 5 In the case of corner grates, the strength of the screening surface increases without deteriorating the screening efficiency. Claim 1. A sifting surface comprising a frame in which transversely colostyses are staggered, implemented in the form of plates with partial upper and wide surfaces, characterized in that, in order to intensify the sieving process by preventing the gaps from jamming between the grates, obliquely, and. the upper surface of the previous grate is located in the same plane with the lower surface of the subsequent grate. 2. Surface according to claim 1, characterized in that the bars are provided with stiffening ribs. Sources of information taken into account during the examination 1. USSR author's certificate No. 319358, cl. B01B 1 / OO, 1964. 2. Authors sv-ndrghelstvo USSR № 117О50, 1СЛ. V07 1/00, 1958 prototype). Direction material twists 4 .З