| 摘要 |
A multiple hearth furnace comprises a rabble arm (26) with a tubular stru cture (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 ar ound 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 (11 0). 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) fo r exerting a clamping force onto the clamping bolt (150).
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