Bearing protection device for electric spindle under static stress

The utility model relates to a bearing protection device for an electric spindle under static stress. Wherein the guide sleeve is connected with the main shaft, the pull rod is arranged in the main shaft and the guide sleeve, the piston is arranged in the piston cylinder and located on the outer side of the pull rod, a cylinder cover is arranged on the outer side of the piston cylinder, a hole channel communicated with the piston cylinder is formed in the cylinder cover, and a pull plate capable of making contact with the guide sleeve is arranged at the end, close to the guide sleeve, of the piston cylinder. The piston cylinder and the cylinder cover can axially move in the direction of the main shaft. The utility model can ensure that the bearing is not subjected to axial impact force andthe service life of the bearing is prolonged. 本实用新型涉及一种电主轴静态受力时轴承保护装置。其包括壳体组件、主轴、拉杆、导套、活塞、活塞缸、缸盖，导套与主轴连接，拉杆置于主轴和导套内，活塞置于活塞缸内，位于拉杆外侧，活塞缸外侧设置有缸盖，缸盖上设置有与活塞缸连通的孔道，活塞缸靠近导套的一端设置有可与导套接触的拉板，活塞缸和缸盖可沿主轴方向轴向移动。本实用新型可保证轴承不会受到轴向冲击力，提高轴承使