Cargo stop-gear of the lifting mechanisms in the form of a closed circuit hydrosystem

Abstract

Stoppers are used to hold loads at a height and prevent their uncontrolled reversal movement in manual and mechanical drives of lifting mechanisms. Recent researches have shown that scientists, designers and constructors continue to look for ways to improve the design and operation of cargo brakes and stoppers, therefore the development of the latter remains relevant scientific and technical task. The article describes the structure of new cargo stop-gear, which contains a gear pump, short pipelines, regulating throttle, reverse valves and a liquid container. All the parts are mounted on the frame of the pump. The work of the cargo stop-gear operated from the lifting mechanism has been considered. The gear pump is driven in the direction of cargo lifting,and pumps the liquid through an open circuit of the hydrosystem. Upon completion of lifting, the cargo stops and creates a reverse torque, the direction of the pump rotation changes and stops, because the reverse circuit of the hydrosystem is closed by the regulating throttle. To lower the cargo a regulating throttle is used- the return circle of the closed circuit hydrosystem opens, the gear pump is driven and it pumps the liquid in the reverse circuit of the hydrosystem. When we want to stop the movement of the cargo – the regulating throttle overlaps the reverse circuit of the closed circuit hydrosystem. The recommendations on the selection and calculation of components of the cargo stop-gear of the lifting mechanism have been given. The proposed cargo stop-gear in the form of a closed circuit hydrosystem is advisable to use in load-lifting and other equipment, as the durability of parts increases and energy costs reduce during its operation