The Design And Research Of A Novel Heavy-load Positioner

This paper presents a novel heavy-load positioner which can manufacture large and heavy workpieces matching with the console NC milling machine or the console NC column boring machine. This positioner's load capacity is 100t, and the turning accuracy is ? 0. 5?. In this paper, we made a comprehensive study and analysis on this positioner, the specific contents are as follows:We introduced the current development of the positioners, studied the mechanism that commonly used in these positioners, pointed out the weakness and disadvantage of them. To overcome the shortage of these devices, we developed a novel mechanism. In this mechanism, we designed two strategies that one is the free end of the screw rod moves adown and the other upwards. Then we analysed the structure and load-carrying capability, chosen the 2nd one as the mechanism of our positioner.We discuss the issues that the particles fly beyond the boundary and developed a novel method——boundary-suturing to solve this problem. After establish the model of optimization, though PSO,we get the proper sizes of this mechanism. Then, we implement kinematics and dynamics analysis about the turning motion of this positioner, study the movement accuracy fuzzy reliability, prove the reliability meets the design requirements.Base on FEA,the static analysis and modal analysis of the key parts are introduced。we built the FEA model of the whole positioner. through the static analysis of the FEA models at 7 different positions, we studied the strain of the front end point and the back end point of the plate, drew the curve of the rotation error of the positioner. At last, the modal analysis of the whole model was conducted to identify the weak links of the structure, providing a basis for the work and design of the positioner.