Tunnel type freezer is a device that freezes frozen items to an intermediate temperature of -18 ° C in a short period of time, and quickly passes through the ice crystal production belt (within the range of 0 to -5 ° C) within 30 minutes to achieve the goal of reducing the loss of nutrients and maintaining their original flavor.

Firstly, place the frozen product tray containing the food to be frozen on the horizontal conveyor chain of the freezer. The frozen product tray enters the lifting track of the freezer chamber with the conveyor chain and performs a step lifting motion. When the frozen product tray rises to the bridge position, the pusher pushes the frozen product tray on the lifting track onto the descending track. Then, the frozen product tray runs along the descending track to the horizontal conveyor chain, and the conveyor chain sends the frozen product tray out of the freezer chamber. When the food is carried out in the quick freezing room with the frozen product tray, the strong cold air generated by the refrigeration system forms a stable horizontal circular low-temperature airflow under the action of the fan and guide plate, which exchanges heat with the vertically moving frozen food. The frozen food is quickly cooled and frozen, completing the freezing process. All the above processes are completed under the command of the "brain" - programmable logic controller (PLC) of the freezer, and human-machine interaction is achieved through the LCD touch screen. The Home screen of the touch screen is equipped with "automatic", "quick freezing time adjustment", "manual", "alarm", "status", "defrosting" and other operation interfaces. The system enters the automatic operation interface upon startup, and the work instructions are issued by the "Start" and "Stop" buttons on the touch screen.