| 摘要 |
construction materials production. SUBSTANCE: lifting device has frame, group grip and grip-to-frame connecting unit which includes at least two columns located around grip gravity center and column displacement mechanisms made in form of rack-and-gear drives whose racks are mounted on columns, and gears, on frame. Columns are installed for vertical displacement in guides arranged on frame. Guides are spaced vertically through 2/3 rds of group grip travel. Gears of column displacement mechanisms are installed for synchronous rotation. EFFECT: optimization of transmission of traction force to grip. 4 cl, 2 dwg |
