We can help with the standard steel belt conveyor design to optimize tracking solutions of your PureSteel® metal belt or conveyor system. Belt can also help with engineered forced tracking solutions such as Metrak©, Flanges or Cam followers. For more complex systems, Belt Technologies offers a custom-designed auto tracking system for ease of operator use.
Belt Technologies has developed a simple and effective pulley system for independently steering flat belts while allowing for easy, on-the-fly tracking adjustments.
This patented system solves tracking problems that result from changes in an operating environment; it also eliminates downtime by allowing independent belt adjustments on a common, multi-pulley shaft. Steering is accomplished by adjusting the angle of the pulley relative to the belt and modifying lateral tension. Rather than moving the pulley shaft through the use of pillow block adjustments, the ISP design fits a variable steering collar (with either a skewed or offset bore) and a sealed bearing assembly to the body of the pulley. When rotated, the collar changes the angle of the pulley body, resulting in the controlled bidirectional movement of the belt across the pulley face.
Belt offers three types of manual tracking:
Pulley Axis Adjustment
Adjusting the pulley axis in a metal belt system is the most effective way of tracking a metal belt. Belt edge tensions are changed in a controlled manner, thus steering the belt. The technique is also applicable to both flat-faced and crowned pulleys. Ideally, both the drive and idler pulleys would have adjustable axes. In reality, however, the idler is the only adjustable pulley. The drive pulley is usually difficult to adjust due to its interface with motors or other power transmission devices.
Crowing Friction Drive Pulleys
When crowned friction drive pulleys must be used, it is in conjunction with—not in place of—axis adjustment. This is because crowned pulleys will not self-center a metal belt. Crowned pulleys work best on thin belts, as the belt web must conform to the crowned face of the pulley. While increased tension can be used to achieve belt-to-pulley face conformity, tension cannot be so high as to cause permanent belt deformation. The optimal geometry for a crowned friction drive pulley is a full radius, with a chord height no greater than the thickness of the belt that is running on the pulley.
In cases where simple axis adjustment cannot completely eliminate improper tracking, forced tracking methods such as cam followers or glass-filled Teflon® flanges may be necessary and acceptable. System design relationships may need to change; this may involve the use of a thicker belt than might otherwise be recommended, since forced tracking techniques can contribute to a decrease in expected belt life.
An alternative forced tracking technique for wider belts employs a V-belt bonded to the inner circumference of the metal belt. This two-element belt, which Belt Technologies calls the Metrak© System, distributes tracking stresses on the V-belt rather than on the metal belt, thus maximizing belt life in a forced tracking system.
Don’t Just Take Our Word For It
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