Method for dynamically measuring rigidity of silicon balance spring and rotational inertia of balance wheel and measurement device

The invention discloses a method for dynamically measuring the rigidity of a silicon balance spring and rotational inertia of a balance wheel and a measurement device. The method comprises the following steps of A, adjusting a measurement state to a vibration state similar to the work of a watch and be close to the working frequency of the watch; B, dynamically measuring the vibration periods TB and TY of a balance wheel and balance spring vibration system; C, calculating the rotational inertia of the balance wheel to be measured and the rigidity of the balance spring to be measured, wherein the rotational inertia JB of a standard balance wheel in a swing body and the rigidity MB of a standard balance spring in the swing body are known; in FORMULA (1) and FORMULA (2), wherein M represents the rigidity of the silicon balance spring to be measured, and J represents the rotational inertia of the balance wheel to be measured. The method has the beneficial effects that the balance wheel and balance spring vibration system consisting of the balance spring and the swing body executes measurement under the condition of same working condition, so that the influence, which is caused by nonlinear errors, on the measurement is eliminated, the measurement speed is high, and the precision is high; the method belongs to a dynamic measurement method. Furthermore, the rigidity of the balance spring and the rotational inertia of the balance wheel can be measured through an instrument by only replacing the swing body.