基于振动中心固定的静偶分离摆架研究

Owing to the structure of the swing frame, the vibration center of the traditional two-plane vertical balancing machine is fluctuated, which often leads to the large error on measurement and the poor effect for static-couple separation. Based on the theoretical derivation of the vibration model of the traditional two-plane vertical balancing machine, the position formula of the vibration center was established, the torsional stiffness of the springboard around the vibration center was calculated, and the source of error was obtained by the change trend chart of the vibration center and torsional stiffness in the end. In accordance with the source of error, a static-couple separation swing frame that can keep the vibration center unchanged was presented, the position formula of the vibration center was also derived based on the vibration model and the invariance of the vibration center was verified. The constant stiffness value was proved by the torsion stiffness formula of the static-couple separation system, and the measurement stability of the sensor was realized. By the modal analysis of the static-couple separation swing frame, it was found that the flexure hinge only passed the swing signal while the translational spring plate only transferred translational signal. The two functions were independent of each other, which fundamentally determined the static-couple separation of the swing frame. The influence of structural parameters on the swing frame was analyzed for optimizing the design of structure too. Ultimately, the dynamic balance measurement experiments showed that the static-couple separation swing frame effectively improved the capability of static-couple separation for low speed rotating loads and provided an important basis for the structure design of balancing machine swing frame.