Precursor feeding device

The utility model provides a precursor feeding device, it includes the stand and encloses and establish the frame body in the stand outside, be connected with a plurality of fixed disks on the stand, the outside of every fixed disk is rotationally overlapped and is equipped with a rolling disc, the rolling disc with the frame body links to each other, precursor feeding device is still including brakeing the rotational positioning mechanism of rolling disc, rotational positioning mechanism is including seting up a plurality of braking recesses and connection in the rolling disc on the rampart are in more than one thrust structure on the fixed disk the thrust structure is inserted under the state in the braking recess, the rolling disc is relative the fixed disk braking is static. The utility model discloses a precursor feeding device, the effect that stops and stabilizing precursor feeding device can be played by its rotational positioning mechanism, and this rotational positioning agencies positioning is reliable, firm.