The utility model relates to the technical field of
earthworm protein processing, in particular to a multifunctional
liquid nitrogen device for
earthworm protein production, which comprises a
processing cabinet, a cabinet door, a blanking hopper, a hopper plug, a liquid inlet, a connecting
pipe, a
liquid nitrogen spray head and the like, a cabinet door is rotationally connected to one side of the treatment cabinet, a discharging hopper is fixedly connected to the top of the treatment cabinet, a hopper plug used for sealing an opening of the discharging hopper is movably connected to the discharging hopper, a hopper neck of the discharging hopper extends into the treatment cabinet and is provided with a
liquid nitrogen spray head, a liquid inlet is formed in the position, close to the discharging hopper, of the treatment cabinet, and the liquid inlet is communicated with the liquid
nitrogen spray head through a connecting
pipe. According to the quick-freezing and
grinding device, through cooperation of the liquid
nitrogen spray head, the
grinding frame, the
grinding rod, the driving mechanism and other parts, tight connection of quick-freezing work and grinding work is achieved, then the
wind direction of degradation and denaturation caused by
raw material transfer is avoided, and the production efficiency and the product quality are effectively improved.