SE7908887L - SOTFLEKT - Google Patents

Abstract

A soot blower device of the long retracting type, including a box beam within which a lance tube 64 is longitudinally movable by means of a slide 16 suspended on rollers 38, 40 to travel along an integrated rack- track assembly 18, 20 secured to the inner walls of the box beam. These rack-track assemblies have longitudinal rails on their tops for the rollers and longitudinal racks 26, 28, with teeth secured to the bottoms of the rails. The racks are engaged by underlying walking pinions 46, 48, rotatably journalled in the carriage and positioned directly beneath the rollers. In a modification, the combined rack-track assemblies include bottom rail portions 94 in addition to the top rail portions, and bottom rollers 96 are employed in addition to the pinions and top rollers. In another modification, the carriage is supported by an I-beam 100, the bottom flanges 102 of which constituting the tracks, a single rack 106 being secured to the underside of such a bottom flange. The carriage has a set of accessible spur gears journalled at its rear wall near a cover, including a driving gear 58 keyed slidably on a shaft 56 driven by a stationary motor 50 at the rear portion of the beam, the gear set being connected by means of a shaft 82, which projects into the carriage connected with internal gears 60, 80 in the carriage which drive the walking pinions 46, 48, one 60 of the accessible rear gears being slidably connected to the lance tube to rotate the latter as the lance tube is moved longitudinally by the carriage. <IMAGE>