SU1093362A1 - Cylinder revolving screen - Google Patents

Abstract

1. DRUM ROUND, containing a drum with longitudinal elements, having external and internal screening surfaces in the form of arc screens, drive, loading and unloading devices, so that, in order to increase the performance of the screen by increasing the time the stay of the screened material on the sieves, the external sieving surface is cylindrical with gaps to form. In places of breaks the internal sifting surfaces having a curved open shape in cross section. ur, 1 in the corners of which the longitudinal elements are located, and the radius of curvature of the arc perforated sieves of the internal sifting surfaces is equal to the radius of the circumference of the drum cross section.

Description

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2, Screen, in accordance with clause 1, about tl that the drum is provided with leaflet arc cutters installed inside curvilinear open-ended figures parallel to perforated arc screens, which are connected to the external screening surface by means of longitudinal elements located at the points of discontinuities.

The invention relates to a technique for the classification of rocks by size, and can be used in the mining, construction and other industries where screening is used.

A drum screen is known in which rock classification is carried out using a rotating sieve, made in the form of a cylindrical drum lj,

The bedrstatcrm of the given grog, the screening efficiency and productivity are low, as a result of participation in the work of a small screening capacity and a short path to the cores of the material being cooled.

The closest to the invention in technical essence and achievable effect is a drum screen, including a drum with longitudinal elements, containing external and internal screening surfaces in the form of arc sieves, a drive, loading and unloading devices 2J.

A disadvantage of the known screen is low productivity.

The purpose of the invention is to increase the productivity of the screen by increasing the residence time of the screened material on the screens.

This goal is achieved by the fact that in a drum screen containing a drum with longitudinal elements, external and internal sifting surfaces in the form of arc sieves, an actuator, loading and unloading devices, an external sieve surface is cylindrical with gaps, forming internal sifting surfaces in places of breaks, having a cross-sectional shape of curvilinear open shapes, in the corners of which are longitudinal elements,

moreover, the radius of curvature of the arc perforated sieves of the inner sieving surfaces is equal to the radius of the circumference of the drum cross section.

In addition, the drum is provided with sheet arc cutters installed inside curved open-ended figures parallel to perforated arc screens, which are connected to the outer sieve surface by means of longitudinal elements located at the break points.

FIG. 1 shows a drum screen, a general view; in fig. 2 shows section A-A in FIG. one;. in fig. 3 - a section of perforated sieves of external and internal screening surfaces with equal radii of curvature.

The drum screen contains loading 1 and unloading 2 and 3 devices, a drive and a drum 4. The drum, in turn, contains an external cylindrical screening surface consisting of arc perforated sieves 5 and filled with 3-4 breaks, for example, with four (FIG. 2) , formed by two longitudinal elements, which, at points of rupture, transform into internal screenings of the surface, for example, four (FIG. 2), having in cross-section the shape of curvilinear triangular open shapes and made of arc-perforated sieves 6-8 ka Waiting for which are fixed on the longitudinal elements 9-11. In addition, the barban 4 contains inside each internal screening surface sheet arc cutters 12, which are installed parallel to the arc perforated screens 6 and 8. The longitudinal elements 9-1 are arranged in circumferences described from the center of intersection of the geometric axes O of the drum 4. By changing the radii of these circles and the relative position of the longitudinal elements 9 P along their length, it is possible to change the area of the arc perforated sieves of the screening surfaces, the distance between the arc perforated screens 6 and 5, and the distance Between the longitudinal element 11 and the perforated arc sieve of internal sieve: a blunt surface, which is limited by the maximum size of the largest piece of material to be screened, as well as the height of the material to be cut, when it is transferred from one perforated screen 6 to another 8 Drum screen works as follows. The drum is given a rotational movement in the direction indicated by the arrow (Fig 2). The material being fed through the loading device 1 is fed to the center of the drum and, falling on the arc perforated sieve 7 of the inner sieve surface located under the center of the load, is partially classified due to reciprocation. movement under it, and the undersize product is brought into the discharge device 2. When the drum is rotated 30-90, the material to be pumped flows from the loading P1 device 1 and the arc perforated sieve 7 on. The perforated arc sieve 7 of the next suitable internal sifting surface rolls over it, is classified, and the cascade BUT enters the perforated arc sieve 5 by the outer cylindrical sieve surface and is also classified on it, Part. material that has not managed to get on the arc perforated sieve 5 is classified on the arc perforated sieve 7 and enters upon further rotation of the drum to the arc perforated sieve 7 of the next internal pg sowing surface. Then, when the drum rotates 90180 from the original, the progressed material is moved from the perforated arc the sieve 5 of the outer cylindrical screening surface that has fallen on it, on the arc perforated sieve-6, its classification on it and the output of the undersize product using sheet 3624 arc stripper. 12 into the discharge device 2. Upon further rotation of the drum 180-270, the material being drilled, being classified, is moved along the arc perforated sieve 6 by the internal surface screening and cascaded to the arc perforated sieve 8 of the other internal screening surface, it is classified on it when the drum turns 270360, and the undercutting product is brought out by means of sheet arc-type shutoffs 12 to the discharge device 2 and transferred to the arc perforated sieve 5 of the outer sieve surface. At the same time, when the drum rotates through 180-360, the material being passed through from the loading device} hits the perforated arc sieve 7 of the inner sieve surface located at this moment under the load center, it is classified on it, part of it goes to the perforated arc sieve 5 external sifting surface, and the other part - on the arc perforated sieve 7 regular, approached the loading center, internal sifting surface. Subsequently, the movement of the progamming material is repeated, the drum is rotated 360 degrees from the initial position (Fig. 2), the material being projected is located and classified on two arc perforations 5 of the outer sieve surface and on the arc perforated 6-8 screens of internal screenings surfaces, the oversize product, the arc perforated sieves, the filtering of the OPO drum and doing the described. above, the movement is outputted to the discharge device 3. The production of the outer cylindrical surface with gaps allows the output of the undersize product of the internal screening surfaces to be discharged into the discharge device. Performing the internal screening surfaces in the form of curvilinear triangular open figures leads to an increase in the screening surface involved in the work, and creates the possibility of cascading the material to be pumped from one internal screening surface to another intensive mixing, which improves the screening efficiency and increases the performance of the drum screen.

The equality of the radii of curvature of the arc perforated sieves of the outer and inner screening surfaces ensures the unification of the drum, and supplying it with sheet arc cutters located inside the internal screening surfaces makes it easier to remove the undersize product of the internal screening surfaces into the discharge device and prevent its re-engagement in the screening process .

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Claims (2)

1. A Drum Screen containing a drum with longitudinal elements, having an external and internal screening surface in the form of arc sieves, a drive, loading and unloading devices, which is related to the fact that, in order to increase the productivity of the screen by increasing the residence time of screening material on sieves, the external screening surface is cylindrical with discontinuities to form. at the places of disruption of the internal screening surfaces having a cross-section in the form of * curved open figures. ah which are arranged longitudinal members, wherein the radius of curvature of arc perforated screening surfaces sieves internal radius equal to the circumference of the cross section of the drum. in | ω g *5. X »GO GO □ About to> 2. Rumble, according to π. 1, characterized in that the drum is equipped with sheet arc cutters installed inside curved open figures in parallel with perforated arc sieves, which are connected to the external screening surface by means of longitudinal elements located at the points of discontinuities.