cleaning section for wheat flour mill machine

Cleaning of wheat flour milling!

wheat flour mill machine cleaning section

1. The purpose of wheat cleaning, due to the current technical constraints, wheat growth, harvest, storage, transportation and other processes will have impurities mixed. In the growing season, the wheat which is germinated and moldy because of too much rain and the wheat which is attacked by insects and diseases is the impurity in wheat, and the mixing of these wheat will affect the quality and odor of wheat flour.Therefore, in the milling wheat must be cleaned before, all kinds of impurities in wheat completely clean, so as to ensure the quality of flour, to meet the needs of the food industry and people's lives, to ensure people's health, and achieve the purpose of safe production.   

2. Classification of impurities. 

destoner for cleaning the wheat impurity

 impurities in the wheat can be classified according to the chemical composition and physical properties.

(1) According to the chemical composition

The inorganic impurities inorganic impurities mixed with clay and sand, refers to the brick, metal and other inorganic substances in wheat.   

The organic impurities organic impurities is mixed with wheat roots, stems, leaves, grass seed, shell, grain and edible dissimilar value buds, spots, metamorphic and other organic substances of wheat.
（2）It can be divided into three categories according to physical property and particle size of impurity.

①large impurities  

Refers to the impurity retained in Diameter of 4.5 mm sieve screen surface.  

②Side by side impurities  

Refers to the impurities through the diameter of 4.5 mm sieve screen surface, retained in the diameter of 1.5 to 2.0 mm sieve screen surface impurities.

③Small impurities  

Refer to pass through the diameter of 1.5 ~ 2.0 mm sieve screen surface impurities.
（3） According to the specific gravity impurityies can be divided into two categories:  

①Heavy impurities  Refers to the wheat  specific gravity is bigger than the impurities specific gravity.  

②Light impurities Refers to wheat specific gravity is smaller than the impurities specific gravity.

3.Common methods of wheat cleaning

(1)wind selection method  

The method of cleaning the air dynamics properties of wheat and impurities is called wind selection method.The aerodynamic properties are generally expressed as suspended velocities.wind selection method needs participation of air media.Commonly used air - selection equipment including vertical air duct and suction separator. 

(2)Screening method 

The method of cleaning with different size of wheat and impurity is called screening method.Grain size is generally based on the thickness and width of wheat and impurities.The screening method needs to be equipped with a suitable screen for the movement of the sieve, and the relative motion of the sieve and the wheat is used to stratify the wheat.Small size and heavy flour would be pass through the sieve.

The commonly used screening equipment has vibrating screen, rotary flat sieve and pre-cleaning screen.

wheat cleaning machine

(3)Using different grivatity of wheat and impurity to separate them.It is called gravity separation method. The gravity separation method needs the participation of the medium, and the medium can be air and water. The use of air as a medium is called dry gravity separation; the use of water as a medium is called wet gravity separation. The proportion of dry separation equipment commonly used gravity destoner, gravity separation, gravity separation equipment commonly used in wet stone wheat washing machine etc..   

(4) selection method using impurities and wheat geometry and different length of cleaning method called selection method. It is necessary to use the inclined plane and the spiral surface to separate the wheat and the spherical impurity by the different geometric shapes. The common buckwheat seed throwing vehicles and other equipment. The use of different lengths for cleaning requires a rotating surface with a pocket. The short grain embedded bag holes are taken away, and the long grains remain outside the bag holes and are not taken away, so as to achieve the purpose of separation. Commonly used equipment has drum selection machine, disc selection machine, disc roller selection machine, etc..   

(5) impact method by the impurity and wheat of different intensity cleaning method called impact method. Germination, moldy, diseases and insect pests of wheat, wheat and soil surface adhesion of dust, the adhesion strength is lower than that of wheat, the impact of the high-speed rotating component, broken off, the use of suitable mesh separating it, so as to achieve the purpose of cleaning. The impact of equipment commonly used are beating machine, impact machine, wheat brush machine etc..   

(6) magnetic separation method using wheat and impurity ferromagnetic different cleaning method called magnetic separation method. Wheat is a non-magnetic material, in the magnetic field is not magnetized, thus cannot be absorbed by the magnets; and some metal impurities (such as iron nails, nuts, etc.) is a magnetic material in a magnetic field will be magnetized by the magnet adsorption, which is separated from wheat. Permanent magnetic drum, magnetic steel and permanent magnetic box are commonly used in magnetic separation.

Above all the the wheat for cleaning details,

we will give you more information for milling and packing in some days.

50t wheat flour mill machine

Ms. Jane Liu for flour milling machines.

M: +86 132 2344 2174 (whatsapp/viber/imo/wechat)

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