Definition of common terms used in vibrating screen

2021-05-25

List of professional terms for vibrating screen

efficiency of screening
The index used to evaluate the screening effect
Mark

efficiency of dewatering
The index used to assess the effect of dehydration
Mark

designated size

In the particle size classification operation, make
The particle size followed by the separation of raw materials

percentage open area
Total area of ​​sieve hole and area of ​​sieve surface
Ratio

The characteristic size curve

represents the sieving curve of the relationship between the yield of each particle size or the cumulative yield and the relationship between each particle size

top size
The largest particle size

lower size
The smallest particle size

maxsize in feed
The largest particle size in the feed

Screen overflow

The material that does not pass through the sieve is screened on the product, and the material is removed

screen underflow
The material passing through the sieve meshes the product under the sieve,

oversize
Super-grained particles with a particle size larger than the mesh size in the material

undersize
Particles with a particle size smaller than the mesh size in the material

The undersize rate is the percentage of the weight of the sample for materials smaller than the specified particle size
Lower limit content

oversize rate

The percentage of the material under the sieve that is larger than the specified particle size to the weight of the under-sieve

near–mesh material
Critical particles with a particle size close to the mesh size

Moisture represents the humidity of the material, that is, the percentage of the weight of the water contained in the sample to the weight of the sample

total moisture
The sum of external and internal moisture

free moisture When the sample and the surrounding air humidity reach equilibrium under the specified conditions,
The moisture lost is the surface humidity of the material
Air dry moisture, keep moisture when wet

inherent moisture

The pore humidity of the sample, the moisture retained by the sample in a dry state under specified conditions

bulk specrfic grakty
The weight-volume proportion of bulk materials per unit volume, the pile proportion

Screening

The materials are divided into different particle sizes according to the size of the screen surface.

dry screening
Screening without water

wet screening
Screening with the help of water washing

Preliminary screening

The following procedures require that the raw materials are divided into different grades of screening, classification and screening, pre-screening,
Screening before selection

control screening

The screening of materials with unqualified particle size from the crushed material

final screening
Separate sieving for the production of granular products

dewatering screening
Screening for the purpose of removing water

desliming screening
Screening for the purpose of removing mud

medium drainage screening

Screening for the purpose of removing heavy medium (mostly magnetite powder)

Sizing screening

generally refers to the task of dividing materials into several levels. Specially refers to: the material in the medium (water or air) is divided into the difference of its sedimentation speed
Several grades of work