Study of the Operating Element Motion Law for a Hydraulic-driven Diaphragm Mortar Pump

Abstract

A mathematical model of the process of operation of a hydraulic diaphragm mortar pump has been developed. It is aimed to describe the processes occurring during automatic reciprocating motion of the hydraulic cylinder piston under the action of high-pressure oil. Oil flows are formed using a hydraulic distributor. Eight phases of the solution pump cycle were identified.The use of a hydraulic drive in this mortar pump allows one to get rid of the main drawback inherent in mortar pumps with a reciprocating drive mechanism. This drawback consists in the sinusoidal law of the piston velocity variation. As a result, there is a significant pulsation of the mortar supply pressure. Uniformity of velocity of the hydraulic cylinder during the working cycle helps reduce the level of pulsations and improve technical, economic and operational characteristics of the mortar pump.Knowledge of the mathematical model of the hydraulic cylinder provides for a better understanding of operational parameters such as:– sucking capacity of the mortar pump;– the nature of response of the valves for opening and closing;– the mechanism of formation of reverse mortar leaks at the closure of valves;– the mechanism of formation of the level of volumetric efficiency of the mortar pump;– the degree of uniformity of pulsations in the mortar supply pressure.The results obtained from the theoretical relationships were confirmed experimentally