| 摘要 |
The machine (14) is supported on a fixed earthed (60) base (12) by several lugs (16), integral with and tangential to the cylindrical casing (10). Each lug has a vertical bore (24), coaxial with (XX) a holding-down screw (30), passing through a close-fitting precompression spacer sleeve (40), and secured in a tapped hole (38) in the support (12) - opt., by a nut. The spacer sleeve is trapped between metal washers (42,44) under the screw head (32) and on the face (18) of the support. A cylindrical buffer, passed over the spacer, comprises a wider section (56,58), equal in diameter and adjacent to the washers, whose inner face bears on the lug, and a narrower section (50,52) extending into the annular space between the spacer and the bore. The two narrow sections are separated by a sleve (54), close-fitting to the bore. The buffers are formed of stainless steel fibres, woven or knitted, and pressed to shape. The holding-down screw is tightened to place the cylindrical components surrounding it under compressive stress, the extent of which can be varied by choosing spaces (40) of different length. All components being metallic, the machine frame is intrinsically earthed. Two variants are described. |
