Structure and working principle
　　
The cooker, the main machine of the fishmeal plant, is designed as a cylinder having a steam heated jacket throughout and a steam heated rotor, designed as a screw conveyor with hollow flights. The rotor is connected to a spherical ball bearing, and its speed is adjusted by an electromagnet governor. Two seal rotary joints are sitting at both ends of the rotor for steam in and condensed water out.

The raw material is cooked by the rotor, hollow flights and the jacket, then transported by the helicoids slowly. During the coagulation of the fish protein, the volume decreases, and the transporting speed become lower. The mass is mixed, agitated, and discharged smoothly by some automatic control equipments.

　Technical parameter list of SZ cooker

　Structure and working principle

　　The press is also the main machine of fishmeal plant in the wet pressing method. It consists of main body, double-screw, screen holder and power plant. It deals with the cooked material to separate the solid and liquid.

Pressing is carried out in a press chamber consisting of two hollow interlocked cylinders. The cylinder wall is made of heavily supported strainer plates made from stainless steel. The two press screws have tapered shafts and the screw pitch varies so that the pitch, and thus the flight distance, is greatest at the thin end of the shafts. The screws rotate in opposite senses. The material is fed in at the end where the shafts are thinner, and is carried towards the end where they are thicker. As can be seen, the space for the material gradually reduces and, to compensate, liquid is pressed out through the strainer plates surrounding the screws.

　Structure and working principle

The main machine dryer, consists of a horizontal cylinder and a steam heated rotor which is equipped with heating plates. There are propellers in the plates, the angel of which could be adjusted, to push the meal ahead. The steam through the rotor is distributed through the heating plates evenly. The steam and the condensed water flow separately in the coiled tubes in the heating plates.

The discs and propellers supply good agitation of fish meal, a large area of contact between meal and disc and, accordingly, means for efficient dehydration.