Synthesis for Driving Linkage of Single-crank and Bi-rocker in Plate Turnover Machine by Allowable Transmission Angle

The driving linkage of single-crank and bi-rocker in plate turnover machine is essentially two crank-rocker linkages of centric type together with a driving shaft，in which two cranks have a phase difference. The working principle of the driving mechanism is analyzed and its accurate description of synthesis problem，which is synthesizing a crank-rocker mechanism of centric type according to allowable transmission angle，when the frame length and the swinging angle of rocker are given. The analytic relation of these mechanisms between the minimum transmission angle and the link lengths，the swinging angle of rocker is derived，the changing trends of the link lengths and the maximum length ratio when minimum transmission angle approaches its supremum is also analyzed. Furthermore，the analytic method is built to synthesize a crank-rocker mechanism of centric type according to permissible transmission angle. A case for synthesizing the driving linkage in plate turnover machine is given，and then the correctness and feasibility of the synthesis method of the results of performance parameter analysis are verified.