TANK WASHER

摘要

An automatically operable tank washer. A power head drives a screw through a fixed nut to rotate a nozzle assembly while moving the nozzle assembly lineally. A linkage causes the nozzle on the nozzle assembly to swivel during lineal movement of the nozzle assembly. The power head includes a piston-operated reversible rotary motor that is controlled by the supply of air to a four-way automatic reversing valve with spring-loaded mechanical switches. An automatic throttle valve to vary the speed of the motor in response to the lineal position of the screw. An automatically operable cam valve to vary the speed of the motor during each 360 DEG cycle of rotation of the screw. Means for interchanging screws to vary the pitch of the screw. Means for interchanging cams to select the patterm of rotational speed variation.