This section provides an overview for screwfeeders as well as their applications and principles. Also, please take a look at the list of 11 screwfeeder manufacturers and their company rankings.
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A screwfeeder is a device that discharges powder or granules from a container or feeds them at a desired pace.
With liquids, the flow rate can be easily controlled by simply opening and closing valves, but with powders and granules, a mechanical means of conveyance = feeder is necessary because friction can cause defective discharge or spurts.
There are various types of feeders, such as electromagnetic feeders, table feeders, etc., in addition to screwfeeders, and they are used according to the required performance, such as the particle size and strength of the powder or grain to be fed, the processing volume, and the fixed-quantity feeding capability. Screwfeeders are positioned as feeders with relatively high quantitative feeding performance.
Screwfeeders are generally installed at the bottom of an inverted conical powder storage container called a hopper, and powder is pushed out and discharged by the rotation of a screw. Since the powder is pushed by the screw, it can be transported even if the container is inclined upward to some extent.
The feed rate can be precisely adjusted by the rotation speed of the screw, and is often used for fixed-quantity feeding of raw materials.
Another feature of this system is that the powder and granules are sealed inside the screw and the hopper in the front stage, allowing inter-process conveying with pressure differences such as between atmospheric pressure and vacuum. Screwfeeders with high sealing performance are used in pneumatic conveying, where powder is carried by the airflow in the piping.
The driving force for screwfeeders is the friction between the screw and the powder/pellets. Therefore, there is a risk of wear and shape breakage of the powder/pellets. To avoid this, wear-resistant treatment of the screw and proper selection of the blade shape are necessary. This type of conveying is not suitable for conveying coarse particles that are prone to breakage.
In addition to the vane type, there are other types of screw shapes, such as ribbon screws, which have a helical shaft itself, and the number of shafts varies, including single and dual shafts. The number of shafts varies, such as one or two. Generally, these are designed according to the characteristics of the powder or grain to be conveyed.
The structure is simple, with a screw passing through the powder flow path. The screw is supported by bearings and there is a small gap between the screw and the casing. Powders and granules remaining in this gap are not discharged by the movement of the screw, so they must be cleaned separately when switching materials to be conveyed. Care should also be taken after transporting materials that may stick.
Since the screw can be switched between forward and reverse rotation to convey in the opposite direction, it is possible to switch flow paths with a single feeder. Also, structurally similar to a mixer, it can combine conveying and mixing operations.
*Including some distributors, etc.
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ASG is a division of Jergens, Inc., was founded in 1976, and headquartered in Cleveland, Ohio. ASG both manufactures and distributes solutions for assembly including precision torque and angle DC electric fastener systems. ASG is ISO 9001:2015 certified. ASG groups include ASG Express, ASG Precision Fastening, ASG Automation, and ASG Integrated Services. Together they specialize in electric and manual screwdrivers, production aides, tool accessories, air motors, pneumatic torque control tools, pulse tools, torque wrenches, current control tool systems, automation systems, auto feed systems, air grippers, torque arms, screwdrivers & nutrunners for automation, and peripheral automation equipment.
DEPRAG USA is the Lewisville, Texas-based headquarters of DEPRAG, originally founded in 1931. DEPRAG is a distributor of assembly equipment and tools and industrial machinery. DEPRAG’s product lines include advanced screw driving technology with automatic screwdrivers, sequence controllers, measuring technology, accessories, and individual solution offerings. Other product segments include feeding technology including bowl feeders and sword feeders among others, automation including standardized assembly systems and intelligent manual work stations, air motors featuring vane motors and turbine motors, industrial tools, and “Green Energy Turbines segment featuring energy recovery.
Jamieson Equipment Company (JEC) was founded in 1982 and located in the state of Georgia. JEC serves infrastructure-related industries including pavement with concrete, aggregate, and asphalt, chemicals, sewage and waste management, and agriculture and food. JEC sells, installs, retrofits, repairs, and offers training and troubleshooting for a range of components and tools from simple fittings to motion sensors to electronics to valves to actuators, cranes, mixers, silos, hoppers, and plants.
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