UPPER-DRIVE-TYPE MAIN SHAFT COMPOSITE BODY FOR CENTRIFUGAL SUPERGRAVITY DEVICE

摘要

An upper-drive-type main shaft composite body for a centrifugal supergravity device. The upper end of a main shaft (59) is coaxially and fixedly connected to the lower end of a slip ring shaft (52), and the upper end of the slip ring shaft (52) has a slip ring (51) sleeved thereon; a magnetic fluid sealing structure (511) and a sealing flange (513) are mounted at the middle of the main shaft (59); the magnetic fluid sealing structure (511) comprises a bearing cover (511-2), a deep-groove ball bearing (511-3), a housing (511-4) and an O-shaped ring (511-7); an annular notch groove is provided at the circumferential surface of an inner ring at the top of the sealing flange (513), an oil seal (513-1) is mounted in the annular notch groove, an elastic check ring (513-2) for a hole is arranged on the upper side of the oil seal (513-1), an annular groove is provided in a surface of an annular step of the sealing flange (513), and a sealing ring (513-3) is mounted in the annular groove; and the lower end of the main shaft (59) is coaxially and fixedly connected to a connecting flange (515) by means of an expansion sleeve (516). The upper-drive-type main shaft composite body solves the key problem of a lower-drive-type main shaft composite body wherein same cannot achieve automatic leveling and load active separation from a main shaft under a high-rotating-speed, high-load and vacuum environment; and same can meet working conditions of different rotating speeds, is suitable for special working conditions of a long time, a high vacuum and an excessive rotating speed, and can achieve an automatic leveling function of a load under the action of the gravity thereof.