Different Separation Methods for Grain Cleaning Sieves

Different separation methods for grain cleaning sieves:

Grain cleaning sieves separate grains and impurities based on their airflow characteristics, utilizing the suspended velocity of grain particles and impurities in the airflow for separation. This principle is applied to hand cranked fan cars and belt type lifting machines during manual lifting. The circular air separator shown can be used to remove light impurities from grains. Grain enters the air flow evenly through the hopper and feeding roller, and falls to the bottom and is discharged from the machine by a screw conveyor. Impurities are carried by the air flow and enter the dust collection room through the suction duct. After settling to the bottom, they are discharged from the machine by another screw conveyor, and the air returns to the inlet fan for further circulation

Grain cleaning sieve is used to separate impurities that are similar in size and shape to grain particles but different in weight, such as stones, mud blocks, metal particles, glass, and coal slag. There are two separation methods for grain cleaning screens: wet method and dry method. The typical equipment for wet method of grain cleaning screens is a wheat washing and drying machine, which consists of a spiral water washing tank and a vertical drying part. Impurities of greater weight precipitate in the washing tank and accumulate at the bottom of the tank, which are sent to the discharge outlet by a small spiral conveyor; The wheat grains are transported by a large spiral conveyor to the drying section to remove free water from the surface

The equipment for grain cleaning dry method includes a specific gravity stone removal machine and a specific gravity grading table. Grain is uniformly fed into a tilted and reciprocating porous plate (fish scale perforated plate or steel wire woven mesh plate) in a gravity stone removal machine, and is fluidized by a controllable airflow, forming a semi suspended state and discharged from the bottom by gravity flow. Heavy stones, mud blocks, etc. move upwards against the porous plate surface due to reciprocating vibration and are discharged through the aggregate area. There are two types of ways to provide airflow: suction and blowing. The working principle and structure of the specific gravity grading table are similar to that of a specific gravity stone remover: first, divide the grain and impurities into two parts according to their weight, and then clean them separately. This can reduce the number of subsequent cleaning equipment or switch to smaller equipment

Grain cleaning sieve is used to separate impurities with poor resistance to friction and impact, such as mud, dirt, awns, wheat wool, and insect infested hollow particles adhering to the surface and grooves of grain particles.

. The flower iron sieve wheat beater has a rotor equipped with a steel plate that rotates in a perforated cylindrical sieve. The wheat grains entering the machine are subjected to impact and friction between the pallets and cylindrical screens, removing adhered impurities. Mud and insect eaten empty grains are also crushed and discharged through the sieve holes along with impurities outside the machine. The wheat grains are then discharged from one end of the drum. The structure of a thresher is similar to that of a wheat thresher, but with different working parameters, used to remove awns from rice and barnyard grass. The working component of the impact suction fan is a high-speed rotating nail plate. When the grain passes through the nail plate, it is thrown out and collides with the lining before falling into the conical friction chamber. Impurities are separated and removed by the impact and friction, and the grain is discharged after suction treatment