Why McLanahan Apron Feeders
McLanahan Apron Feeders are designed based on a decades-old concept developed by National Iron Company of using a crawler undercarriage into an Apron Feeder. Their reliability has been tested by hundreds of Apron Feeders still operating in the field.
McLanahan Apron Feeders are available in six chain sizes, 16 standard flight widths and an infinite range of lengths — all designed to meet a customer's application requirement.
McLanahan Apron Feeders use sealed-for-life undercarriage components with oversized head shaft bearings to reduce monitoring and keep maintenance requirements to a minimum. Designed to low stress limits to provide unmatched reliability, Apron Feeder components include a lifetime lubricated chain, carry rollers, return rollers, idler wheels, 100,000 hour bearings and fabricated components. Since there are very few components used in an Apron Feeder, maintenance inventory can often be kept quite low. When maintenance is required, most tasks can take place at the tail-end of the Apron Feeder, which is easily accessible.
Safety pull cords and a zero speed switch are standard features. Unlike other vibratory feeders, when you stop an Apron Feeder, material flow stops immediately.
Apron Feeder flights can be supplied in cast manganese or fabricated, formed steel to fit the duty requirements of the application. This gives ultimate flexibility in having the right feeder duty for the application.
Apron Feeder drive systems can be supplied in electrical-mechanical or hydraulic to match the duty and requirements of the application.
How Apron Feeders Work
Apron Feeders work by conveying material from a hopper to the delivery point at a controlled rate of speed.
The Apron Feeder consists of a frame, undercarriage components, head shaft, tail shaft, flights and a drive. The undercarriage chain wraps around the head shaft and tail idler, and flights are bolted to the strands of chain. The chain and flight combination rides on undercarriage rollers.
An Apron Feeder is usually installed under the opening at the discharge end of a hopper. As the head shaft rotates, the material in the hopper is pulled out of the opening by the movement of the flights. The size of the opening combined with the speed of the flights provides a metered flow.
Apron Feeders are tailored to fit many applications and installation requirements. This means that various aspects of the material stream, such as depth, can be adjusted to meet the required flow of material.
Popular Applications for Apron Feeders
Apron Feeders are used to feed material in a wide variety of material handling applications, from mining ores, aggregates, scrap/recycle material or any special material you have. They can handle small and large capacities from 10-6,000 tph and can withstand extreme impact loading. Apron Feeders deliver material at a uniform rate, allowing optimal feeding to downstream equipment. Due to their long service life with low-maintenance applications, Apron Feeders are a popular feeder choice.
Benefits of McLanahan Apron Feeders
- Rugged welded steel beam frame with impact rails to limit flight deflection, thus eliminating permanent bending of the flight
- Large anti-friction spherical bearings on the head shaft, resulting in long bearing life
- Grease lubricated bearings mounted in housings and labyrinth or taconite seals
- Tractor idler wheels (sealed for life) are mounted to adjustable tail frame weldment
- Standard undercarriage components, yielding a reliable, long-life feeder
- Cast manganese segmental sprockets bolted to heavy steel hubs keyed to oversized front drive shaft
- Superior flight sealing overlap design, reducing the leakage of fines
Frequently Asked Questions
What are the standard sizes of an Apron Feeder?
Apron Feeders are calculated and designed for each application. This ensures the performance and reliability for which they are known.
What information is required for sizing an Apron Feeder?
Information critical to the power calculation and design of an Apron Feeder includes type of material, feed rate, size of material and more. Please contact McLanahan for a questionnaire you can fill out so we can help you select the proper Apron Feeder.
Are the carry rollers replaceable without splitting the chain?
The carry roller mounting channel is designed with removable sections to allow for carry roller replacement from outside the feeder.
Are the return rollers easily replaceable?
The return roller stub shaft is mounted to a bracket. This bracket is mounted with four fasteners to the web of the main beam. The fasteners are accessible from outside the feeder. Once the bracket is removed, the return roller may be replaced.
What is the average life of the components?
The average life of a drive sprocket is one to four years, a carry roller is five to seven years, a return roller is five to 10 years, a tail wheel is seven to 10 years and a chain is seven to 15 years.
What drives are offered?
Both electrical-mechanical and hydraulic drives are available. Electrical-mechanical drives are less costly and limited in speed range and start/stops per hour. Hydraulic drives are more costly, with infinite speed range and infinite start/stops per hour.
Should I choose a sealed or SALT chain?
A sealed chain is preferred, as it lasts longer and requires little routine checkups. If the lip seal fails on a SALT chain, failure is imminent.