| 摘要 |
The invention relates to nipple-electrode pre-assemblies and joints, such as those used on electric furnaces, and to a method of distributing thread clearance throughout the preassembly and/or joint. This method includes: the providing of at least one lengthwise hole between each end of the nipple, said hole being substantially axial or parallel to the axis and preferably enlarged in cross-sectional area for a portion of its length at one end of the nipple; the threading of one end of the threaded nipple into the internally threaded socket of the pre-assembly electrode section to such a degree and in such a manner that by adjustment of a mechanical adjusting means to be inserted later into the lengthwise hole from the other end of the nipple, it is possible to provide or maintain a clearance between the non-load bearing flanks of the nipple threads and of said threaded electrode socket, the other end of said threaded nipple also projecting outwardly from said socket; the insertion of the mechanical adjusting means through the projecting end of the lengthwise hole and the positioning of it in the opposite end of the lengthwise hole, said means being capable of being adjusted from the end of the hole through which it is inserted so as to cause or be capable of causing relative axial movement between the nipple and the electrode section of the pre-assembly, said adjustable spacing means comprising an internally threaded outer member whose position becomes fixed in the said opposite end of said lengthwise hole of the nipple, and a corresponding externally threaded inner member capable of axial movement within said outer member; and the adjustment of the inner member by the use of a suitable tool inserted into the hole of the projecting end of the nipple so as to bring or keep the load bearing flanks of the nipple and the electrode socket section into contact securing the nipple in this position, thus providing said clearance between the non-load bearing flanks of the nipple threads and of said threaded electrode socket.
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