CONTINUOUS-HEAT-TREATMENT ROTARY-DRUM-TYPE HEATING FURNACE SPECIAL FOR BEARING STEEL BALLS

摘要

A continuous-heat-treatment rotary-drum-type heating furnace special for bearing steel balls, comprising a furnace body (1) provided with a feeding end portion (10) and a discharging end portion (11); a rotary drum (2) rotatably disposed in the furnace body (1) around the axis line extending in the horizontal direction; helical flow guide parts (3) disposed on the inner wall of the rotary drum (2) and helically distributed along the length direction of the rotary drum (2); heating assemblies (4) located between the outer side of the rotary drum (2) and the inner wall of the furnace body (1); and a driving assembly (5) used for driving autorotation of the rotary drum (2). The feeding end portion (10) is located at one end of the furnace body (1) and transfers steel balls to feeding ends of the helical flow guide parts (3) by means of a screw feeder (b); the discharging end portion (11) is located at the other end of the furnace body (1) and is communicated with discharging ends of the helical flow guide parts (3). When continuous production is satisfied, a helical transfer mode is used, in which steel balls are transferred from the feeding end portion (10) to the discharging end portion (11) in a rolling process, so that the steel balls are heated more uniformly and thus the quality of steel ball heat treatment is improved. In addition, the yield is increased significantly, the difference between inner structures of the steel balls is little, and the quality is stable.