THREADED CLAMPING DEVICE FOR SCREWING OF COVERS TO PRESSURE RESERVOIRS, PARTICULARLY TO REACTOR PRESSURE RESERVOIRS Russian patent published in 2000 - IPC

FIELD: mechanical engineering. SUBSTANCE: clamping device has bearing ring thrust upon cover and provided with through holes for threaded pins. Device also has clamping fixtures coupled to separate threaded pins for extension of screwed-in threaded pins in axial direction. Clamping fixtures include two hydraulic clamping cylinders resting on bearing ring and pressure jumper overlapping them. Jumper is provided with through hole for bushing tension nut screwed together with corresponding threaded pin. Nut is provided with thrust step overlapping pressure jumper. External diameter of bushing tension nut is narrowed on separate clamping fixtures below thrust steps of nut. This narrowing is outcoming in to thrust steps at the top. Thickened part of coupled pressure jumper which narrows through hole in upper zone is inserted in narrowing. As a result, clamping device may be used in reservoirs with small spaces between threaded pins. EFFECT: enhanced efficiency. 10 cl, 5 dwg