The selection of layout and features of the common screw conveyor

 Screw conveyors are commonly used:

 LS type screw conveyor, GX type screw conveyor etc..

Screw conveyor application scope and characteristics:

(1)A screw conveyor conveying equipment widely used in chemical industry, building materials, food and other departments in the industry. Mainly used for conveying powdery, granular and small shape material. It is not suitable for transporting metamorphic, viscosity, easy to agglomerate material.

(2)Operating temperature-20~50℃; material temperature is less than 200 ℃; conveyor length is less than40m, is no more than 70m.

(3)Compared to screw conveyors and other conveyor equipment and has a simple structure, small cross-sectional dimensions, good sealing performance, you can add more loading and unloading, safe and convenient operation and low manufacturing cost advantages. It has the disadvantage of mechanical wear and tear is more serious and low throughput, high power consumption and the material easily crashed during transport.

Classification and selection of screw conveyor:

(1)There is an entity type screw blade of the screw conveyor, belt surface pattern of spiral surface and blade three.Entity spiral surface become law, 0.8 times the pitch GX type blade diameter, suitable for powdered, granular material transport. D screw surface preparation method, with helical blades of the same pitch diameter, suitable for conveying powder and scrap materials. Spiral blade less, mainly used for conveying viscosity and accessibility of the material, in the transmission process, complete mixing, the mixing process, the spiral blade diameter of a pitch about 1.2 times the times.

(2)There are two Calvinistic and dextrose rotation to the screw blade.

(3)Types of screw conveyor is horizontally fixed screw conveyor, vertical conveyor. Horizontal fixed screw conveyances a type of the most commonly used. Vertical screw conveyor for short distance promotion materials, the conveying height is generally not more than 8 meters, the spiral blade for spiral surface entity, it must use horizon spiral feeding, so as to ensure the necessary feed pressure.

(4)LS, GX type screw conveyor material outlet end, should set the 1/2~1 ring reverse spiral sheet, prevent powdery material plugging end bearing. Above the exit tube spiral piece.

(5)Screw conveyor by the screw machine body, a material inlet and outlet and a driving device of three parts. Screw conveyor bearings, bearing body by the head, tail suspension bearing, spiral, casing, cover and base etc.. The driving device consists of motor, reducer, coupling, base.

(6)Selected according to material characteristics. For powder, granules and small block materials as horizon or inclined conveyor angle ≤ 20 °, optional common screw conveyors, of bulk, heat and equilaterals can choose single pipe (Spiral pipe) screw conveyor, when powdered or fine granular material vertical lifting, the choice of vertical screw conveyor.

(7)Common screw conveyor for conveying explosive, flammable, toxic or corrosive materials. When necessary and manufacturers of negotiation, using special security measures.

(8)The edible material conveying stringent requirements (such as glucose), screw conveyor, spiral casing body, a bearing seat and other material contact parts made of stainless steel, copper, need other materials. The internal can not add the lubricating oil, therefore, must use the powder metallurgical bearings, and have godliness measures, in order to prevent the pollution to the food.

(9)Because the casing screw conveyor is installed, so the larger difference area at ambient temperature, convey material high temperature, long conveying distance, measures must be taken to prevent the casing to temperature changes, the expansion and the damage of equipment. The general case can add asbestos pad thick in the casing flange, to adjust the telescopic casing, or the casing floating support on the base, make the case in the base so as to adjust the telescopic slide freely.

(10)Single screw conveyor drive device can not be used to drive a screw shaft triangular belt or chain drive, in order to avoid the shaft end in the radial force, produce cantilever load, making the whole body from the tug.

(11)Because of the spiral conveyor is very sensitive to overload, so when the design in the hopper (or bins) lower,the feed volume shoddily not be control, may be overloaded and material clogging phenomenon, even damage the drive device, therefore it must be in the spiral convener feed inlet arranged leaf wheel feeder are rigid and feeding device, to ensure the safe operation of the screw conveyor.

(12)When the spiral convener feed, have a certain pressure on the shell, which can make the dust from the inlet overflight, the pollution of the environment, in this case, the feed inlet is required to take pressure and dust measures, or arranged at the flashing valve electric device in the feed inlet, to prevent dust leakage guarantee environment from pollution.

Layout of the form of screw conveyor:

(1)Various driving device:

1)Driving device adopts a motor, reducer combination, which is divided into right and left installed installed two forms.

2)Uses of v-belt transmission for motor, shaft mounted reducer drive unit.

3)The assembly adopts the form of gear motor direct drive.

4)Layout of driving device of vertical screw conveyor.

(2)Screw conveyor arranged in a horizontal installation, if conditions allow the best driving device is arranged on the discharging end position, because the driving device and a material outlet arranged in the coleus (with a thrust bearing) when more reasonable, can make the spiral tube shaft is in tension. In addition, each discretion (section, the middle section, the tail section) arrangement order best follow the spiral section length the size are arranged in order and the spiral section of the same together with the principle, it will bring much convenience to the design, manufacturing and order.

(3)In general layout should also be careful not to make the support base or when discharge port arrange a casing joint flange, inlet should not be arranged in the canopy above the joints and suspension.