MULTIPLE HEARTH FURNACE

摘要

A multiple hearth furnace comprises a rabble arm (26) with a tubular structure (120, 124, 186) and a solid plug body (110). The latter is received in a socket (100) arranged in an arm fixing node (28). It has an axial through boring (132) and cooling fluid supply and return channels (146) arranged around this through boring (132). A clamping bolt (150) is rotatably fitted in the through boring (132). It has a bolt head (154), which can be brought by rotation into and out of hooking engagement with an abutment surface (162) on the arm fixing node (28). A threaded end (158) of the clamping bolt (150) sticks out of the through boring (132) at the rear end of the plug body (110). A threaded sleeve (160), which is screwed onto this threaded end (158), bears on an abutment surface (162) at the rear end of the plug body (110) for exerting a clamping force onto the clamping bolt (150).