AUTOMATIC SCRAPER FOR CLEANING INNER SURFACE OF TUBES (VARIANTS) Russian patent published in 2006 - IPC B08B9/57 

FIELD: apparatuses for cleaning tube cavities, mainly for cleaning inner surface of pump and compressor tubes, oil-, gas- and other product main conduits by removing out of them paraffin clay-sand deposits, iron-containing refuse by passing scraper inside tube by action of product flow transported along tube.

SUBSTANCE: scraper includes pusher arranged at least in one guide with possibility of motion and alternating interaction with members limiting scraper stroke in final points of cleaning. Scraper also includes at least one shutter engaged with pusher for closing, opening or partially opening flow-through cross section of tube; mechanism for controlling closing of flow-through cross section of tube driven by means of pusher stroke and providing forced relative motion of pusher and shutter. In variant of invention scraper has shutter mounted in rotary axle. Mechanism for controlling closing of tube cross section is toothed rack mechanism and it joins rotary axle with pusher. In next variant of invention shutter is mounted by cantilever fashion on guide or on pusher by means of holder whose other end is jointly connected with shutter. Mechanism for controlling tube cross section closing is in the form of tie rod jointly connected with pusher and with shutter or with guide and with pusher. At least one shutter has at least two parts. Mechanism for controlling tube closing is in the form of tie rod jointly connected with guide and with periphery of each part of shutter. Both parts are made with possibility of mutually opposite or single-side rotation around the same axle mounted in pusher across tube axis in lengthwise groove of guide arranged along axis of scraper with possibility of reciprocation motion.

EFFECT: enhanced operational reliability, increased useful life period, improved efficiency of simplified -design scraper used in tubes with small and high velocities of flow of different viscosity.

19 cl, 12 dwg