Chayka D. Development of the universal pistonless hose concrete pump with hydraulic drive for the conditions of the building area

The dissertation is devoted to the development and research of the universal pistonless hose concrete pump with hydraulic drive. Object - working processes of construction mixtures transportation through pipelines using a pistonless hose concrete pump; goal - increase the efficiency of pistonless hose concrete pump and its reliability by stabilizing the conditions for building mixtures supply by gradually deforming the flexible hose in the working part of the machine case under the action of three pinch rollers placed on each of the two rotor's traverses, rotational speed of concrete pump is regulated by a hydraulic drive and it has the ability to work on hoses with different diameters (dhose = 32, 50, 75 mm); methods - hydrodynamic modeling, mathematical physics methods, physical and mathematical modeling by applied mechanics methods, experimental data statistical treatment, planned experiment method; novelty - mathematical model of the new universal concrete hose pump hydraulic system is developed for the first time; dependencies to determine the range and height of the concrete supply taking into account its properties with a universal concrete pump are found for the first time; the time of acceleration and deceleration of the universal pistonless concrete pump are determined for the first time; mathematical modeling process of the building mixtures supply with a concrete hose pump is carried out and the degree of irregularity is determined for the first time; reliable performance evaluation of the new concrete hose pump is proposed for the first time; the possibility of using a universal concrete hose pump for operation with different hoses diameters in the range of work Ptehn = 5 ... 15 m3/h is proved for the first time; usage a new concrete pump as part of the small-sized equipment technological set using the method of wet gunite during concrete work is proved; results - the work of a new concrete hose pump with a hydraulic drive is theoretically investigated and proved the advantages of its design; dependencies to determine the main performance indicators of the universal concrete pistonless hose pump are found: performance, discharge pressure, input pressure, power, efficiency; technical documentation for a new universal pistonless concrete hose pump with hydraulic drive is developed and industrial prototype is manufactured; the influence of the concrete pump design on the concrete mix uneven supply is determined; increase the reliability of the new universal concrete hose pump compared to existing analogues is proved; ranges of working process rational technological parameters of concrete mixtures transportation with universal pistonless concrete pump are experimentally determined; introduced during the construction of the medical center "OnClinic" in Kharkov; industry - mechanical engineering.