The invention discloses a cleaning device and method of a finished
oil tank. The cleaning method comprises the following steps: a centrifugal
machine and a cleaning pump supply high-pressure water to a cleaning
robot, and the cleaning
robot moves in a tank and sprays the high-pressure water at the bottom of the tank and on the wall of the tank, so that the
storage tank is cleaned; the
sewage generated during cleaning is reclaimed through a
sewage sucking pump; after the
sewage is primarily separated and filtered through three-phase separation equipment, cleaning water enters filtering equipment to be processed by secondary filtering; the filtered water is supplied to the
robot through the centrifugal
machine and the cleaning pump so as to realize the circulation of a cleaning medium. According to the cleaning method disclosed by the invention, through the technology of secondary filtering and the technology of filter-residue separation, the
oil tank can be washed clean without using a large amount of
clean water, so that the energy-saving purpose and the environment-friendly purpose are realized. The cleaning device is provided with filter-residue separation equipment, the
sludge and the
suspended solids,
coming out of the three-phase separation equipment and the filtering equipment, pass through the filter-residue separation equipment, so that the water medium enters cleaning circulation; therefore, the using amount of the
clean water in circular cleaning is reduced, and the treatment expenses of sewage and
sludge in a later period are lowered.