Pumps and pump handling apparatus

摘要

An electric pump 13 is mounted on a support 24 and can be raised and lowered using chains 25 driven by a motor. Supply cable 14 for the pump is stored on drum 15. Fluid is discharged by the pump through hose 17 stored on drum 18. A spray ring 20 attached to the pump is supplied with water through hose 21 stored on drum 22. The drums are rotated by hydraulic motors 32 and chains eg 36, 37. As the pump is raised at a uniform speed the drums are rotated to take up the slack hose and cable. The height of the pump is sensed from movement of the pump motor and the pressure supplied to the hydraulic motors is changed in discrete steps to maintain the wind up speed on to the drums despite the change in weight of unwound hose or cable.