The key points for screw conveyor selection

1.Conveyor capacity
Screw conveyor conveying capacity refers to the amount of material per unit time.Users should consider whether the conveyor can support the use of other production equipment before design in order to design a reasonable conveyor model.
2.Conveying speed
Conveying speed can improve the transmission capacity. For conveyor which adopts chain as traction, the transporting speed should not be too fast, in order to prevent the power load increasing .
3.Component dimensions
The component dimensions of conveyor includes conveyor trough width or pipe diameter , etc. Which directly affect the transmission capacity of screw conveyor.
4.Conveyor length and inclination
Conveyor length and inclination directly affects the total resistance and required power of the conveyor. Screw conveyors installation can be level and inclined, so please let us know the using condition when select the model.
5.Screw conveyor motors
Motor selection can be speed controlled motor or general motor to control the conveying speed and throughput per hour.
6.Others
Whether hopper should be considered in the inlet or not,as well as the feeding hopper size.  

Do you want a suitable screw conveyor?Check the required data for model selection.

Please see following data:
1. Material to be screened _______
2. Material size _______mm
3.Size distribution_______%?
4 .Water content  _______%?

5 .Capacity________t/h
6 .Material density ________t/m3?
7 .Material temperature _______ ℃?
8. Material is corrosive or not_______?
9. Distances between inlet and outlet ______m
10.Voltage __V__HZ 3 phase
11.Working environment _______

12.Special requirement:____

Above mentioned information is the basic one client need to offer which will save lots of time and money for model selection,further information please check: www.pkmachinery.com

Material Analysis before a Screw Conveyor is being used

The initial step in engineering a screw conveyor is to analyze the material being handled anf as certain its physical properties in order that they may be thoroughly evaluated and understood prior to proceeding with the conveyor sizing and selection. The properties of the materials are discussed in further depth below.

1.Lump Size

The minimum diameter of a conveyor screw for a given application is determined by the maximum lump size of the material being handled. It is necessary to thoroughly analyze the material and determine its maximum lump size and the percentage of lumps to total volume along with the minimum particle size and screen analysis when possible. 

2.Flowability

The flowability of a material will affects the horsepower requirement of the conveyor in question. Flowability is related to the angle of repose of a material. Fine free flowing materials can be handled at higher trough loadings with lower horsepower requirements than coarse, sluggish ones. 

3.Abrasiveness

The more abrasive the material being handled, the greater the wear the conveyor components are subjected to. Hence, it is necessary to determine the abrasive quality of the material in question prior to sizing the conveyor. Abrasiveness can be determined by knowing a material’s hardness. 

4.Moisture Content

Moisture content of materials is a factor that affects material flow. Excessively dry or wet products tend to flow easily. However, many develop sluggish characteristics when having moisture content between the two extremes. This is not accounted for in the material tables which follow and such materials should therefore be reclassified. 

What is impact of different materials on screw conveyor?

 Screw conveyor design depends on the parameters, however,these parameters depend on the required conveying material, thus, the screw conveyor engineer recommends will be a suitable equipment to convey materials, which can achieve the best possible conveying capacity.

Conveying capacity is one of the most important target to measure the production efficiency of screw conveyor. Generally speaking, the fast rotated speed of screw shaft can improve the production of conveyor.On the contrary, the low rotated speed will reduce the production. However, during the operation, the rotated speed should not be too high,otherwise material will be thrown outward due to the large centrifugal force, it will cause material cannot be conveyed, so the speed of the screw conveyor must be set in a certain value. 

Generally speaking, according to the material properties, materials can divided into four categories. The first category: material with good flow ability, lighter and non abrasion; The second category: material without abrasion,however the flow ability is worse; The third kinds of size scale and liquidity with second near the mill, but larger cut materials. The fourth class is illiquid and the fierce cut grinding material.