Study Of Key Technology Of Piezoelectric Six-axis Heavy Force Dynamometer

In the current equipment manufacturing industry, the huge heavy-load manufacturing equipment is the basic equipment of manufacturing industry chain. In order to increase the production efficiency, the operation equipment should coordinately work with manufacturing equipment, which needs to measure the dynamic six dimension force of operation equipment. The traditional way is to measure the force distributed from the heavy-force operating equipment.Funded from the national 973 project, this paper mainly studies some key technologies of piezoelectric six-axis heavy force dynamometer on shafts:analyze the principle of load-distribution of the dynamometers, design and manufacture a ear-shape piezoelectric six-axis heavy force dynamometer on shafts, design a dynamometer which have some different measuring range and solve the contradiction between the axial measuring range and lateral measuring range of the dynamometer.We analyze the load-distribution principles of the dynamometer, build the corresponding mechanical models, and derive theoretical formulas of load-distribution ratio based on mechanics of materials and structural mechanics. Then, we analyze the mechanical models of the fixtures by ANSYS software and modify axial load-distribution ratio formula. Design a static calibration experiments and calibrate sensors and the dynamometer. Results show that the theoretical load-distribution is corresponding with the experimental load-distribution, with axial error 1.5% and lateral error 2.53%. And the formulas of load-distribution radio can provide a reference basis for the design of piezoelectric six-axis heavy force dynamometers on shafts, which is helpful for increments of efficiency in designing the dynamometer.Based on the formulas of load-distribution, we analyze main parameters related to load-distribution ratio and design a ear-shape piezoelectric six-axis heavy force dynamometer on shafts. Then, make a size optimization about it by ANSYS software. The experimental results show that the measuring range of the dynamometer increases 55.27% than circle-shape dynamometer in axial direction, and increases 12.7% in lateral direction. But its volume is reduced by 48.23%.Put forward a six-axis force dynamometer with adjustable measuring range. Solve the contradiction between the axial measuring range and lateral measuring range of dynamometer and realize that a dynamometer can measure forces of different measuring ranges, greatly reducing the cost of manufactory of such dynamometers.