OVERVIEW OF THE DESIGNS OF HINGED VIBRATION EXCITERS AND RESEARCH OF THEIR PARAMETERS AND THE FEASIBILITY OF THEIR USE ON VIBRATION PLATFORMS TO IMPROVE THE COMPACTING OF REINFORCED CONCRETE PRODUCTS

Abstract

Construction of buildings using prefabricated technology is increasingly used in Ukraine. In parallel with this, the list of ready-made reinforced concrete products, which are used in monolithic-frame and monolithic-prefabricated technologies, is expanding. Because of this, it becomes necessary to increase the number of lines for the production of ready-made reinforced concrete products and to use equipment that will allow to quickly adjust the production process depending on the change in the type and size of the final products. At the same time, the most responsible process is the compaction and formation of the concrete mixture using volumetric compaction technology on vibrating platforms of block or frame construction. Such installations are designed for the compaction of concrete mixtures in forms standardized by size and which do not fully meet the requirements of universality when changing the production program, ensuring high quality of finished products, and are characterized by significant energy consumption. One of the directions for solving the mentioned shortcomings is the creation of a vibration installation with attached vibration exciters and a variable mode of operation. Such an idea is ensured by the use of a vibrating installation in which the frame with a plate welded on top is directly the pallet on which the compaction process takes place. The dimensions of the future product are limited by the installation of sides and partitions on the pallet, which are fixed using magnetic fasteners, thanks to which it is possible to easily rearrange the installation for other standard sizes of panels. The use of attached vibration exciters, which are evenly spaced over the area of the forming plate, aims to improve the distribution of amplitudes in the volume of the concrete mixture, improve quality and reduce the time for compaction of the product. The work includes an overview of the existing designs of mounted vibration exciters, an analysis of their disadvantages and advantages, as well as technical parameters. Ac-cording to the obtained results, it was determined that planetary pneumatic vibrators have advantages in the amount of disturbing force that they are able to generate per unit of their own mass, higher indicators of dyna-mism criteria compared to electric and hydraulic centrifugal analogues. Pneumoplanetary vibration exciters are simple in design, reliable and allow adjusting the frequency of oscillations within certain limits without the use of additional devices.