Abstract: In a charging material preheater for a metallurgical smelting plant having a shaft (5) which has closure members (7, 8) which are pivotable by a control member (6) and which include fingers (9, 10) which are arranged parallel and at a spacing relative to each other, the fingers (9, 10) of a closure member (7, 8) are mounted with a central portion in a first rotary mounting (12, 13) and in a second rotary mounting (21, 22) of the frame structure (2) with an outer portion which is passed outwardly through an opening (14, 15) in the shaft wall, by way of an elbow lever mechanism (16, 17), and lever arms (18, 19) of at least two elbow lever mechanisms are connected together by a connecting member (23) which is pivotably engaged by a control member (6) which is supported in a third rotary mounting (26, 27) of the frame structure (2).

Abstract: An upper and a lower electrode section are mechanically interconnected through a nipple threaded into the lower electrode, as well as into a receiver on a tension rod pulling the nipple up, and thereby the lower electrode is urged against the front end of a twin wall upper electrode. The receiver is for its most parts surrounded by a twin wall sleeve passed through by cooling fluid and being suitably held within the upper electrode for axial displacement but bars intermittent contact with the receiver to obtain cooling thereof as well as of the connecting nipple.