The invention provides a
reagent disc control device which uses a combined rotary wheel to control an inner rod and an outer rod in a
locking mechanism to move. By improving the structure of the combined rotary wheel, the
locking mechanism can lock and release a
reagent disc more stably and smoothly. Even if the rotary wheel is in direct contact with the
locking mechanism, the locking mechanism will not shake. In this way, the
reagent disc control device is simpler in structure and higher in response speed, and ensures the operating stability of the locking mechanism, thereby ensuring the accuracy of
fluorescence detection reading in the reagent disc. Moreover, the reagent disc control device can complete more precise and complicated actions, so that the locking mechanism can switch between an initial state and a working state flexibly. The locking mechanism is allowed to return to the initial state when it is not working, and to enter the working state when it needs to work. Springs in the locking mechanism do not need to be in a compressed state for a long time, and can be reused many times, thereby prolonging the service life and lowering the cost.