LOGGING HOIST Russian patent published in 2002 - IPC

FIELD: industrial geophysics. SUBSTANCE: logging hoist can be employed to run in and pull out down-hole logging instruments. Hoist has winch drum with cable carrying down-hole logging instruments wound on it, drive with device adjusting rotation speed of winch drum with hydraulic pump and control desk. Device adjusting rotation speed of winch drum comes in the form of two planetary gears whose input central pinions are interconnected by gearing linked to driving shaft. Output central pinions are linked via gear-wheels to driven shaft and sprocket of chain transmission transmitting rotation to winch drum. Pinion carrier of each planetary gear are connected to hydraulic pumps whose inlets communicate with case of oil-filled adjusting device and whose outlets communicate with controllable differential throttle unit which outlet is connected to case of adjusting device. Controllable differential throttle unit is linked to servomotor. EFFECT: simplified design of hoist, increased smoothness and provision for uninterrupted change of speed of movement of logging cable in logging hoist. 1 dwg