Archimedes designed the first screw conveyor in third century B.C., it was used to remove water from ships and to irrigate farmland. The equipment itself has evolved over time but the practical use is the same; with each turn of the screw, a fixed volume of material is discharged. The main function of a screw conveyor is to transport bulk material from one process to another. Screw conveyors are used in thousands of processes and in many industries such as food processing, petroleum refining and wastewater treatment. Screw conveyors are cost effective and require minimal maintenance to operate. They are commonly made with carbon steel, stainless steel and abrasion resistant alloys, which can be configured for any process and to fit in any location.
Shafted Screw Conveyor
Shafted screw conveyors are ideal for semi fluid materials which are free flowing to sluggish. It is enclosed for corrosive or hazardous materials and efficiently distributes bulk materials to various locations using inlets and discharge points. There are also modifications available to provide a chopping or mixing feature. Screw conveyor can also be used to dry, cool and heat bulk materials in transit.
Shaftless Screw Conveyors
Shaftless screw conveyor are ideal for handling bulk materials with high moisture content, sticky and sluggish material and difficult to convey bulk materials. The shaftless conveyor provides a non-clogging conveying surface and is available in many configurations, this provides flexibility for plant lay outs. The shaftless spiral allows for higher fill rates and typically uses less power, this reduces wear and maintenance.
Vertical Screw Conveyor
Vertical screw conveyors elevate bulk materials at very steep or completely vertical inclines and are ideal for handling dry to semi fluid materials. It has the capacity to elevate bulk material 30 feet vertically without the use of internal bearings. The compact design of the vertical screw conveyors will fit into most plant layouts. The vertical screw conveyor has minimal parts and has an enclosed design for dust and vapor tight requirements.
Screw Feeder and Live Bottoms
When a screw conveyor is used as a metering device it is considered a screw feeder. Screw feeders and live bottoms are the most accurate and efficient method of metering bulk materials.
Screw conveyors are also known as augurs and compliment industrial mixing and grinding equipment. For information on screw conveyors contact H.C. Davis Sons Manufacturing Co., Inc. Their Company was established in 1894 and manufactures a wide range of industrial equipment used for many applications and industries.
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