The profile of a conveyor pulley will impact its ability to effectively track the conveyor belt. The profile of a conveyor pulley should be selected based on the need for belt tracking as well as the desired life and performance of the belt. While many profiles could be utilized in pulley construction, the most common profiles are detailed below. A pulley profile may utilize multiple crowns on one common surface.
Face of the conveyor pulley is flat. Does not contribute to belt tracking, but maximizes belt life by providing an even, consistent wear surface.
Face of the conveyor pulley is tapered with the high point located at the center and tapering toward each end. Provides belt tracking capability, but the peak at the center causes wear and stretching at the center of the belt, decreasing belt life.
Face of the pulley is flat in the center and tapers towards the ends forming a trapezoidal shape. Provides enhanced belt tracking capability when compared to single crown while providing an even wear surface, lengthening belt life.
Face of the pulley is crowned in one continuous radius across the entire length of the pulley. Provides enhanced belt tracking when compared to trapezoidal crown, an even wear surface, and lengthened belt life.
PARABOLIC / HYPERBOLIC CROWN
Face of the pulley is crowned in a parabolic or hyperbolic shape across the entire length of the pulley. Provides enhanced belt tracking when compared to radial crown, an even wear surface, and lengthened belt life.
Conveyor systems which utilize v-guided conveyor belt to assist in belt tracking will require a pulley with a v-grooved profile. The v-groove profile in the pulley face is manufactured to allow for clearance of the vguide around the circumference of the conveyor pulley. The v-groove provided in the profile of the conveyor pulley is not designed to assist in belt tracking and does not provide additional driving force for the conveyor belt.
The chart below contains typical v-section types and the recommended sizes for the corresponding vgrooves. The recommended minimum pulley diameter will vary by belt manufacturer, belt material, v-guide construction (solid, notched, serrated), v-guide type, belt size, etc. The minimum pulley diameter should always be verified with the belting manufacturer before specifying or purchasing a v-grooved pulley.
V-groove clearances on pulleys are typically up to ¼" wider and 1/16" deeper than V-guide dimensions. When V-grooves are required, consult the belt manufacturer's recommendations for minimum pulley diameter based on the type and style of belt being used.