Liquid nitrogen quick-freezing equipment for swimming crabs

Abstract

The invention discloses liquid nitrogen quick-freezing equipment for swimming crabs. The liquid nitrogen quick-freezing equipment for the swimming crabs comprises a box, a material-feeding transmission mechanism and a material-discharging transmission mechanism; a material inlet and a material outlet are arranged at two ends of the box; a front clapboard and a rear clapboard are arranged inside the box; the material-feeding transmission mechanism comprises a driving feeding drum, a driven feeding drum, a front guide roller, a lower guide roller and a rear guide roller; a material-feeding conveyor belt is wound between the driving feeding drum and the driven feeding drum; the material-feeding conveyor belt sequentially passes downwards through the front guide roller, winds the lower guide roller and passes through the rear guide roller so as to form a recessed portion; the material-discharging transmission mechanism comprises a driven discharging drum and a driving discharging drum; a material-discharging conveyor belt is wound between the driving discharging drum and the driven discharging drum; the material-discharging conveyor belt and the material-feeding conveyor belt both moveclockwise; a turning-over mechanism is arranged outside a terminal of the material-feeding conveyor belt; and liquid nitrogen spraying mechanisms are arranged, inside a freezing chamber, above both the material-feeding conveyor belt and the material-discharging conveyor belt. The liquid nitrogen quick-freezing equipment for the swimming crabs is quick in freezing rate, so that, overall freezing efficiency and freezing quality of swimming crabs can be improved so as to have liquid nitrogen consumption reduced.

Description

technical field [0001] The invention relates to the technical field of liquid nitrogen quick-freezing, in particular to a liquid nitrogen quick-freezing equipment for swimming crabs. Background technique [0002] Swimming crab meat is tender and tender, delicious, high in protein content, rich in essential fatty acids and vitamins A and D, and is loved by Chinese people. It is also one of the main aquatic products that my country exports to earn foreign exchange. Swimming crabs are regarded as an important aquatic resource in China, but because their muscles are rich in protein, fat and various minerals, they are easily spoiled after death, and crab meat will also experience muscle "gelatinization". In order to reduce the quality deterioration of swimming crabs and inhibit the gelatinization of muscle fibers, low-temperature freezing storage methods are usually used. The commonly used methods for cryogenic freezing of swimming crabs include plate quick freezing, freezer fre...

AI Technical Summary

Problems solved by technology

This liquid nitrogen freezing tunnel machine has the following defects: (1) The spraying device is located above the conveyor belt, and the sprayed liquid nitrogen can only contact the swimming crabs on the conveyor belt on one side, and the freezing of the swimming crabs on the contacting side of the conveyor belt will be affected. Uneven freezing occurs, which affects the quality and efficiency of freezing; (2) A large amount of liquid nitrogen will remain after spraying with the liquid nitrogen nozzle, and the amount of liquid nitrogen used is large; (3) Liquid nitrogen is evaporated into low-temperature nitrogen directly from the feeding end of the equipment And the discharge end escaped, and the low-temperature nitrogen was not reused, and the low-temperature nitrogen escaped from this part caused a lot of waste of the remaining cooling capacity

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