Leg Upgrades

Key Benefits

There are four key areas of concern for a properly operating leg. 

First:  Cup capacity rating. The "Howell Company" has measured all the major brands of cups at water level fill. They have increased the fill rate at a 5 degree fill level above water level from the front lip to the back of the cup. This allows an accurate comparison between cup brands and sizes. This also gives a conservative cup fill rating at which the leg will perform.  Most legs do not achieve rated capacity. They have increased  the number of cups to improve capacity and have increased  product damage and actually lose capacity.

Second:  The point at which the leg is being fed (the boot).  If the leg is being fed too low, the material will not flow into the cup efficiently and will cause product damage and reduced leg capacity.

Third:   Pre-discharge of the cups as they travel over the head pulley. As the cups come across the top of the head pulley, the distance between the cup lip and the steel leg increases. the grain has centrifugal force to discharge the product. One; too much space allows the grain to leave the cup prematurely and fall down the leg instead of reaching the discharge area.  Two; the cups today are made from plastic; plastic cups are slicker that old style steel cups and the material being elevated discharges too early. This causes capacity loss , dusting, and product breakage.

Fourth:  The location of the discharge area of the leg head. If the throat area is too high relative to the head pulley we are not left with enough room to allow the cups to complete their discharge. This essentially runs the grain right back down the leg and back where it started.  This causes excessive damage, lost capacity, and increased power consumption.

An Improperly designed or installed leg causes grain damage, as stated above, resulting in a high percent of screenings and unnecessary loss of income.  The principal conditions which create breakage are pre-discharging [up-legging], where the grain falls back down the up leg and back-legging [down-legging] where the grain does not get out of the cup before it passes by the throat and drops into the down leg.  This causes breakage as the grain is repeatedly elevated and dropped, either impacting the fast moving cups or falling the full height of the leg.

A leg running properly, will break less grain than a slower leg  pre-discharging and/or down-legging.

As part of the upgrade process we will:

  • Determine your vision for the facility and what this equipment should be and will be doing in the future. Establishing goals for this equipment and facility.
  • Do a Utilization review of your facility to establish your current capacity and efficiency of your equipment. 

  • Make suggestions to improve capacities by balancing all aspects of your facility so your equipment works together smoothly, creating less fines, more capacity, using less horsepower. 

  • Oversee purchase of new components insuring compatibility of equipment to achieve  your    goals. 


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Last modified: April 01, 2007