1、 附录 A Basics of flexible screw conveyors In basic form , a flexible screw conveyor consists of a spring steel or stainless steel flexible screw that is enclosed in s flexible or rigid plastic tube or a rigid steel tube (a small diameter ,plastic inner tube may also run the entire length of the flexi
2、ble screw) and driven by an electric motor， normally located at the discharge end of the conveyor. The intake end of the conveyor tube is typicallyequipped with a charging adapter-a U-shaped trough that connects to the outlet of a hopper ordirectly to the outlet of process equipment such as a bulk b
3、ag discharger,bagdumpstation,grinder, crusher ,screener, blender, reactor, or storage vessel. The flexible screw passesthrough the charging adapter trough exposing a section of the screw to material flowing intothe trough from above.When rotating the exposed section of screw feeds material into the
4、outer tube where it is then propelled through the tube by theenclosed portion of the screw. The screw automatically selfcenters within the tube providing clearance between the screw and tube wall a phenomenon resulting from the loose fit ofarotating flexible screw withinatube filled with bulk materi
5、alThis property affords sufficientspace for particles to flow without damage depending on the fragility and size of particlesbeing conveyed. A removable cleanout cap covers the intake end of the conveyor tube Permitting rapid emptying and flushing of the tube as well as disassembly and washdown ofco
6、mponents. Because the intake end of the screw requires no bearing， and since the discharge end is coupled to the motor drive above and/or beyond the point at which material exits the discharge spout， material does not come in contact with seals or bearings.The flexible screw is therefore the only mo
7、ving part contacting material. Typical applications include conveying of materials between storage vessels ， bulk bag dischargers， manual bag dump stations， drum dump stations， crushers， screeners， blenders， reactors，Packaging equipment ， injection molding and extrusion machines and other Process eq
8、uipment. Capabilities A flexible screw conveyor is your most likelychoice if its listofdistinguishingcapabilitiesclosely matches that of your requirements， or if an individual capability exclusive toaflexible screw solves an individual problem of key concern.CoMPare your needs with the following att
9、ributes。 onemovingPartcontacting material The only moving part contacting material inaflexible screw conveyor is rugged flexible screw， which is directly driven by an electricmotor. This simple design does not require the filters， cyclone separators，internal bearings， and other moving parts found on
10、 pneumatic conveyors， bucket elevators， rigid augers， drag chains， and/or aeromechanical conveyors. Conveys free-flowing and nonfrce-flowing materials- A flexible screw conveyor cantransport bulk materials rangingfrom large pellets to submicron powders，including difficult to handle products that Pack， cake， seize， fluidize， plug， or smear. Some examples are fine powders such as fumed silica， compressible materials such as titanium dioxide， dense materials such as metal powder， friable materials， materials that fluidize， and materials
