Screw feeders are designed to meter and convey bulk materials to the next step of the process with operating under flood loaded with a head load of product on the screw or multiple screws. Capacity or feed rate can be accurately controlled with screw feeders.
Variable speed drives improve metering accuracy and can provide a wide range of feed rates. Screw feeders are available in a variety of sizes, lengths, configurations and materials of construction(carbon steel or stainless steel).

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Introduction:
Screw feeders are designed to meter and convey bulk materials to the next step of the process with operating under flood loaded with a head load of product on the screw or multiple screws. Capacity or feed rate can be accurately controlled with screw feeders. Variable speed drives improve metering accuracy and can provide a wide range of feed rates. Screw feeders are available in a variety of sizes, lengths, configurations and materials of construction(carbon steel or stainless steel).

Application and installation:

screw feeder is suitable for metering and conveying powder, granular, small block materials, such as cement, grain, chemical fertilizer, ash, sand, screw feeder is not suitable for conveying perishable, viscous and easy agglomerating materials.

The screw feeder is typically mounted directly to a:

Hopper – Square or rectangular in shape with sloped bottom and limited storage capacity

Bin – Square or rectangular in shape with sloped bottom and large storage capacity

Silo – Cylindrical in shape with cone or mass-flow bottom and large storage capacity

SCREW:

screw consists of a several of blades of helix shape welded to a pipe or shaft. Screw function is to convey the material in the screw feeder flight.

The pitch of the last screw determines the feed rate of the screw feeder and is called the control pitch.

Our company has professional engineers and skilled workers to design and produce control Pitch to meet the customers capacity requirement.

Drawing:

Technical specification:

Model No.	Diameter of screw (mm)	Distance between screws (mm)	Rotary speed (r/min)	Convey capacity（m³/h）	Power (kw)
RL-100	100	100	140	2.2	1.6
RL-160	160	160	120	7.6	2.8
RL-200	200	200	90	11	3.2
RL-250	250	250	90	22	5.3
RL-315	315	315	75	36.4	8.4
RL-400	400	355	75	66.1	11
RL-500	500	400	60	93.1	15.3
RL-630	630	450	60	160	25.9
RL-800	800	500	45	223	36
RL-1000	1000	560	35	304	48
RL-1250	1250	630	30	458	73.3

Primary considerations for the selection of a screw conveyor are:

1. Type and condition of the material to be handied, including maximum particle size,and, if available, the specific bulk density ofthe material to be conveyed,

2. Quantity of transported material, ex-pressed in pounds or tons per hour.

3. The distance for which the material is to be conveyed.

4. Width and length of screw feeder inlet opening