Improving The Efficiency of Stationary Concrete Pumps Using Whitworth Quick Return Mechanism

Abstract

The objective of this paper is to study the working of concrete pumps and to establish an alternative mechanism that would enhance their efficiency. A concrete pump is a machine used for transferring semi-solid, ready-mix concrete by pumping. As observed from the analysis of their functioning, it was evident that the transition of energy from mechanical to hydraulic, and back to mechanical during the process was accompanied with significant energy loss, which comprehensively reduced the efficiency of the concrete pump. A great proportion of this energy was lost through heat dissipation. Reducing the number of energy conversions posed to be a promising concept, for which the usage of hydraulic system in the current setup was to be withdrawn. The Whitworth Quick Return mechanism sufficed as a suitable alternative for the required purpose. It was observed from the mathematical analysis of the new mechanism that the theoretical flow rate increased from 45m3/h to 73m3/h, indicating a higher volume of concrete being pumped at the same input energy supply.

Design of Double Oscillating Sliding Mechanism

“…Some of these mechanisms are based on reciprocating type of mechanisms; they are used, for example, in shaping machines and in concrete pumps, with the role of reducing the time in the return stroke in relation to the working time (e.g. : [1,2]).…”

Dynamic Analyses of Whitworth Quick Return Mechanism

“…Ying and Cheng 5 employed the mechanism to develop a bag-breaking device, whereas Endeshaw et al 6 explored the feasibility to mount a piezoelectric energy harvester on the Whitworth quick return mechanism. Recently, Shyam et al 7 used Whitworth quick return mechanisms to improve the efficiency of stationary concrete pumps. Although traditional analytical and graphical methods are widely used in mechanism design, nowadays, computer-aid programmes have streamlined the design process.…”