What Is a Screw Conveyor?

The screw conveyor is a machine that uses a motor to drive the screw to rotate and push the material to achieve the purpose of conveying. It can be transported horizontally, obliquely or vertically, and has the advantages of simple structure, small cross-sectional area, good sealing, convenient operation, easy maintenance, and convenient closed transportation. The screw conveyor is divided into two types: shaft screw conveyor and shaftless screw conveyor. In appearance, it is divided into U-shaped screw conveyor and tubular screw conveyor. The shaft screw conveyor is suitable for non-sticky dry powder materials and small particle materials (for example: cement, fly ash, lime, grain, etc.), while the shaftless screw conveyor is suitable for conveyors consisting of sticky and entangled materials. (For example: sludge, biomass, garbage, etc.) The working principle of the screw conveyor is that the rotating spiral blades move the material to the screw conveyor, so that the force of the material not rotating with the screw blades is the weight of the material itself and Friction resistance of screw conveyor casing to materials. Spiral blades welded on the rotation axis of the screw conveyor. The blade surface types include solid surface type, belt surface type, and blade surface type according to the different materials being conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material moving direction to give the screw axial reaction force with the material. When the machine length is long, an intermediate hanging bearing should be added.

The development of screw conveyors can be divided into two types: shaft screw conveyors and shaftless screw conveyors. ^[1]

LS type screw conveyor is designed and manufactured according to JB / T 7679-95 "Screw Conveyor" standard.

When the screw shaft rotates, due to the gravity of the material and its friction with the tank wall, the material can only be moved forward along the bottom of the conveyor under the push of the blade. The translational motion is the same as the rotating screw ^[3]

Screw conveyor has the following characteristics

1) The structure is relatively simple and the cost is low ^[4]

The screw conveyor is divided from the angle of the displacement direction of the conveying material. The screw conveyor is divided into two types: horizontal screw conveyor and vertical screw conveyor ^[5]

It consists of a drive device that closes the tank and a screw. The screw rotates to output the coal in the tank.

Technical parameters of screw conveyor

specification	Main technical performance	Drive	Drive	weight (Kg)
diameter	length (M)	Yield (cement) t / h	Rotating speed min	Reducer	electric motor
model	Speed ratio	model	power (Kw)
GX200	-10	9	60	JZQ250	23.34	Y90S-4	1.1	726
GX200	-20	9	60	JZQ250	23.34	Y90L-4	1.5	1258
GX250	-10	15.6	60	JZQ250	23.34	Y100L2-4	2.2	960
GX250	-20	15.6	60	JZQ250	23.34	Y100L1-4	3	1750
GX300	-10	21.2	60	JZQ350	23.34	Y100L2-4	3	1373
GX300	-20	21.2	60	JZQ350	23.34	Y112M-4	4	2346
GX400	-10	51	60	JZQ400	23.34	Y132S-4	5.5	1911
GX400	-20	51	60	JZQ500	23.34	Y160M-4	11	2049
GX500	-10	87.5	60	JZQ400	23.34	Y132M-4	7.5	2381
GX500	-20	87.5	60	JZQ650	23.34	Y180M-4	18.5	5389
GX600	-10	134.2	45	JZQ750	23.34	Y180L-4	twenty two	3880
GX600	-10	134.2	45	JZQ850	23.34	Y250M-4	55	7090

Model description of screw conveyor

LS 400 * 25 * 50-M1
Bearing category Select speed r / min
Length of screw conveyor m
Spiral diameter mm
- S is horizontal

L is a spiral

The screw machine is widely used in various industries, such as building materials, chemical industry, electric power, metallurgy, coal charcoal, grain and other industries. Etc., the material temperature is less than 200 . The screw machine is not suitable for conveying perishable, sticky, and agglomerated materials. in

During the use of the screw conveyor, it is necessary to pay attention to the daily maintenance, so as to cooperate with the sand dryer to the maximum extent, ensure the production capacity and efficiency, and extend the service life of the equipment ^[5] .

(1) Lubricating oil should be added to the bearings, gears and chains at regular intervals.

(2) After the box feeder is deactivated, the spiral blades should be checked for wear, and repair welding should be performed when the wear is severe.

(3) Do not overload the conveying capacity, otherwise the material cannot be discharged, causing the screw shaft to bend and the box to rise or fall.

(4) When the conveyed medium has a high degree of frustration, attention should be paid to whether the expansion and contraction of the box is free and there is no jamming place.

(5) When the conveyor is operating and the noise is harsh, it should be covered and inspected to eliminate the fault.