DEVICE FOR CLEANING INTERNAL SURFACES OF PIPELINES Russian patent published in 1994 - IPC

FIELD: pipeline cleaning. SUBSTANCE: device has housing, cleaning members, helical groove made on part carrying cleaning members, channels for working medium and working medium feed system. Housing accommodates power cylinder with piston provided with fore- and after-piston rods. Axial hole made in free end of fore-piston rod accommodates cleaning members holder mounted with the aid of rolling-contact bearings. External surface of holder has helical groove engageable with pin secured in cylinder body and passed through longitudinal groove on fore-piston rod. Fastened to cylinder body is braking unit similar to braking unit secured on after-piston rod. After-piston space communicates through channels with braking unit secured on cylinder body and fore-piston space is connected with braking unit mounted on after-piston rod. Working medium feed system is provided with distributor for alternate connection of fore- and after-piston spaces of power cylinder to main source of working medium. EFFECT: high quality and improved efficiency of cleaning operations. 3 cl, 4 dwg