DETERMINATION OF THE OPTIMAL ROTATION SPEED OF THE BELT CENTRIFUGE WHICH PROVIDES QUALITY CONCRETE SEALING

Abstract

The article considers the technology and machines for the manufacture of reinforced concrete pipes, their advantages and disadvantages. Prestressed reinforced concrete pipes are made by centrifugation. The technological process of their manufacture consists of a number of complex operations. Aggregate and conveyor methods of manufacturing reinforced concrete pipes have become widespread. In the aggregate method of production, the product is formed on a vibrating platform or on specially equipped units consisting of a molding machine, a machine for distributing the concrete mixture in the form. The aggregate method has become widespread and at low capital costs, as it allows the implementation of a wide range of products. Conveyor method is an advanced flow-aggregate. In it, the technological process is divided into separate operations, which are performed simultaneously on separate workstations. Forms with products are moved from one post to another by special transport devices. The main disadvantages of centrifugal molding include the high need for cement to prevent delamination of the concrete mixture during molding. In the centrifugal method, the mold with the concrete mixture loaded into it rotates at a certain speed around its longitudinal axis. The resulting centrifugal force distributes the particles of the mixture along the walls of the mold and moves them away from the axis of rotation, while pressing the mass to the walls of the mold, compacting it. As a result, an internal cylindrical cavity is formed in the product, which allows the formation of pipes and tubular structures. Centrifuges are used for centrifugal molding, in which a cylindrical mold with a concrete mixture rotates at a given speed. Depending on the method of fixing the forms and bringing them into rotational motion, there are three types of centrifuges for forming pipes and tubular structures: axial centrifuges, free-roller and belt centrifuges. Based on the analysis of the technological scheme of production of reinforced concrete pipes by centrifugation, ways to improve the electromechanical converter are proposed