UN METODO DE CONSTRUIR UN PRECONJUNTO DE NUEZ Y TRAMO DE E-LECTRODO.

摘要

1,243,538. Electrode nipple-joints. GREAT LAKES CARBON CORP. 1 July, 1969 [2 July, 1968], No. 33288/69. Heading H5H. An electrode section-nipple preassembly comprising an electrode section 7 and a doubleconical nipple 4 is manufactured by screwing an internally threaded ring 1 having a plane surface 2 on to the nipple 4 into such a position that when the nipple 4 with ring 1 attached is threaded into the socket of the electrode section 7 until the surface 2 of the ring contacts surface 8 of the electrode section 7, a clearance 12 is provided between he non-loading bearing flanks (i.e. the flanks furthest from the centre of the nipple) of the threads of said nipple and the threaded socket, threading the nipple 4 and ring 1 into the socket until the plane surface 2 of the ring contacts the surface 8 of electrode section 7, locking the nipple in the socket in this position and finally removing the ring. Thus when this pre-assembly is screwed into another electrode section until the surfaces 8 abut, the non-loaded flanks of the threads of both halves of the nipple will be spaced from the socket threads of the electrode section into which it is screwed. The ring 1 may be externally ring- shaped as shown or square and the surface 2 is preferably perpendicular to its axis. The nipple and ring are so dimensioned that when the ring is hand-tight thereon its surface 2 is at its posit on of maximum diameter. The nipple is locked in position by a foaming material 9 which expands and sets hard. The material 9 may be introduced to the bottom of the socket before the nipple-ring assembly is introduced, a thermally insulating layer being introduced first if the nipple is preheated. The foaming material may be formulations of polyurechane, polystyrene or polyvinyl. The nipple may be locked in position by injecting, cement, paste or binder into the space between the end of the nipple and base of the socket via radial slots in the electrode section or longitudinal slots in the nipple. Radial pins may be used instead to lock the nipple in position.