MATERIALS HANDLING
FIG. 1 Belt conveyor cleaner locations
and wrap angle may make mounting a secondary belt cleaner diff icult and maintenance nearly impossible. We recommend utilising an updated engineering design programme that uses either the DIN conveyor belt standards or Conveyor Equipment Manufacturers Association (CEMA) methods for the calculation of accurate tension values and the required wrap angle, ϴ. Companies can also consider using a
inspection or maintenance and this can be an issue. Belt cleaners require more attention than major components to ensure system eff iciency. There must be maintenance at optimal cleaning pressures because the blades are wearing components.
DESIGN AND INSTALLATION CONSIDERATIONS Designers should abide by the following considerations if they want to provide users with belt cleaners that are fi t for purpose. First, they should ask whether
the drive pulley wrap angle really needed. A common default wrap is 210 degrees, created by the position of the snub pulley. The gap between the head pulley and snub is an ideal location for a secondary cleaner, but the combination of pulley diameters
larger diameter head pulley. Although choosing a head pulley based on the minimum diameter may seem like it saves money, the Mine Safety and Health Administration (MSHA) reports that up to 85% of maintenance
problems are because of fugitive materials, which increase costs for cleanup, labour, and equipment replacement. A larger head pulley allows for the installation of two cleaners in the primary position and enough snub pulley space for one or two cleaners in the secondary position, signifi cantly reducing the amount of fugitive material. Designers should also place a
priority on easy access to the belt cleaners. Maintenance personnel can spend a considerable amount of time merely gaining access to the equipment but designing access to seldom-inspected or seldom- maintained components based on
The adequate belt tension
It is critical that designers determine the amount of wrap around the drive pulley is required to provide the adequate conversion of torque from the drive into belt tension suffi cient to move the belt without slipping. The fundamental relationship describing this transfer does not depend upon the pulley diameter, only the coeffi cient of friction,
Drive pulley tension relationships
, between the belt and pulley and the wrap angle, and the belt tensions required to prevent slip.
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