Guideline for automatic screw feeder - Deprag

For reliable feeding machines a DIN quality standard (allowable 3% bad parts) is not always sufficient. Higher levels of screw/fastener quality improve the feeder`s reliability. The goal should be a quality grade of 10 ppm (“parts per million“). This means in every 100,000 screws there can be 1 bad part.

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A vibratory spiral bowl is particularly suited to screws with awkward dimensions or those with special feed rate requirements. The sword feeder is applied when extremely gentle handling of the parts is required or when very low noise level is a must. If feeding with a hose system is not possible we also offer pick-and-place procedure.

For effective use of the handheld screw feeders the space available around the screw head on the assembled components is very important.
There is a certain space requirement for the nosepiece split type and ball type.
An even surface simplifies the positioning and handling of the tool. Slanted surfaces with small diameter recessed screw-holes can only be accessed with templates which are available as optional equipment.

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For the correct layout of your screw feeding machine the following data is required:

• Voltage / frequency
• Choice of screwdriver model (torque and speed)
• Screw dimension and screw type (if possible please specify DIN no.)
• Torque (if known)
• Detailed dimensions of assembly components
• Hose length (if over the standard length of 2 m).

To process your order we require sample screws (approx. 1 feed bowl volume) and if possible some samples of the part to be assembled.

The difference between screw conveyor and screw feeder

"When buying a screw conveyor, how to choose a screw conveyor or screw feeder that meets the standard" has become a common problem in the industry, because they usually do not know the difference between the two. By understanding the difference between screw conveyors and screw feeders, the most common mistakes when designing screw conveyor systems can be avoided.
 

Screw Conveyor VS Screw Feeder

Screw Conveyor

Usually used to unload bulk materials from rail cars, trash bins or stacks. Generally used in cement processing plants, aggregate plants, mining, grain storage plants, feed plants, chemical plants, food processing plants, etc. The screw conveyor only needs to move the material from point A to the entrance of point B, and it is always controlled to be supplied by another device. They can be used up and down, mixing, cooling and heating materials can also be completed by standard screw feeders, also known as "transfer conveyors" in the industry.

U Type Screw Conveyor
 

Screw Feeder

Designed to measure bulk materials, the capacity or feed rate of the conveyor system can be precisely controlled using a screw feeder. The inlet of the screw feeder is always filled with water (100%), which is usually installed directly under the hopper, hopper or silo. In the case where the water inlet is full of water, the screw design and screw speed in the water inlet area determine the capacity or feed rate. Since the length of most screw feeders is less than 20 feet, it is not recommended to suspend the operation.

The difference between the screw conveyor and the screw feeder can be expressed in one sentence: the inlet of the screw conveyor is always in a controlled load state, and the inlet of the screw feeder is always in a full load state.  

Purchase notice of screw conveyor

If you are interested in receiving a quote for the latest screw conveyor requirements, please contact Focus Machinery directly! You can be an agent or distributor, and at the same time, you can also provide us with answers to the questionnaire of the screw conveyor. In order to know the size of your screw conveyor correctly, and to ensure that a system that meets your needs has been designed correctly, you need to understand a few questions:

1.) What is the capacity? Is it measured in cubic feet per hour, or tons or bushels per hour?
2.) What is the length or total length of the water inlet and outlet?
3.) Is it horizontal or tilted? If inclined, what is the angle?
4.) How to load? If flood recharge is used, what is the size of the water inlet?
5.) What materials are shipped? Including material type, weight, maximum block size and temperature
6.) What are building materials? Low carbon steel, stainless steel, special paint requirements, etc.