Abstract: A roller or brush for cleaning meshes of rotary screens, comprising a shaft having one or several cleaning members each comprising a body of revolution consisting of two concentrically arranged portions. The outer part in contact with the screen surface is of a stiffness several times greater than the stiffness of the inner portion adjacent to the shaft so that dynamic load at the contact of the brush and screen is several times lower, the efficiency of cleaning of meshes of the screen is improved and the service life of the screen is substantially prolonged.

Abstract: The directional-action mechanical vibrator comprises a housing which accommodates a shaft carrying a number of inertia masses arranged eccentrically thereon, said shaft being linked to a power drive, and a rod is adapted to impart motion to the mass being vibrated which is mounted on a support. The shaft has a crank, and the rod is articulated, through one of its ends, to the crank, and through the other end, to the mass being vibrated, whereas the housing is linked to the support of the mass being vibrated through the hinge joint, and the axis of the shaft is parallel to the axis of the hinge joint.The mechanical system for converting rotary motion into reciprocating motion incorporates said mechanical vibrator and a power drive kinematically associated with said vibrator and comprising an electric motor with a pulley set on the motor shaft, and another pulley is set on the vibrator shaft.

Abstract: A cleaning and/or grading machine for free-flowing materials comprises at least one cleaning and/or grading unit accommodated in a hollow housing which is secured on a frame and connected with an aspirating chamber; a batching device located in the upper part of said housing; an air separating channel installed in the same housing and comprising a thrower of the free-flowing material; a rotor installed in said housing and comprising a screen drum secured thereon, said drum having a material distributor in the upper part; said screen drum is built up of a number of consecutively arranged sections each consisting of a screen in the form of a body of revolution and secured on supporting rings; the sections are interconnected by equidistant tie rods extending through said supporting rings which makes it possible to assemble these sections into standardized screen drums while the cleaners installed at the external side of said drum opposite to each other relative to the rotation axis of said drum ensure efficient

Abstract: A screen for vibrating centrifugal separation machines, which screen is made in the form of a solid of revolution and comprises a sifting part and a non-sifting part. The generatrix of the sifting part has a stepped shape, each step forming a solid of revolution in the form of a hollow conic frustum whose major base faces opposite to the movement of the layer of the loose material under treatment. This construction substantially increases the separating properties of the screen in using it in various vibrating centrifugal separation machines.