Important Guidelines in Conveyor Pulley Selection

April 7, 2019

Conveyor pulley selection guidelines function sort of like a glue. Only, this glue exists to holds a delicately balanced moving framework together. Those function coordinating powers, they’re what creates the necessary system inter-relationships and performance-tuned behaviours in a large-scale conveyor system. As those key features take their place, the gear functions more reliably so that a payload gets where it’s going without incident.

The Functionality Paradigm

The foundations below a large edifice make sure a structure stands tall and stable. Emulating that principle, belt-supporting conveyor pulleys assure performance-driven load flows. In point of fact, since conveyor belts are always on the move, this application of the foundations-reinforcing principle is even harder to achieve. Anyway, as the selection process proceeds, there are a number of essential design factors to satisfy. The pulley cylinders have to be load-capable. That guideline applies to the shaft diameter, the shaft and cylinder alloys types, the mounts, the cylinder cladding, and the end cap welds. Structurally, the conveyor pulleys tolerate static loading effects and they provide enough burdening overhead to handle any-and-all shock stress.

Handling Application-Specific Design Factors

The material and sizing specs have been addressed. What comes next? Plenty, as it so happens. A simple 10-metre long conveyor system can get by on the design outlined above. For a longer, more complex design there are additional features to incorporate. Tensioning requirements enter the engineering formulae. There are snub and bend pulleys to add if the conveyor redirects its load. Inclination angles come next, perhaps because the framework is taking its payload up out of a quarry. The return/tail pulley and drive head need more power and heavy-duty couplings so that the addition of a gravity-feed design doesn’t overload the pulleys or power transmission train.

The Eight Step Pulley Selection Method

To start with, how far is the load being conveyed? Next, is there a per-minute or hour volume requirement? From here, there’s the belt tensioning and cylinder/shaft diameter issue to solve. Hub configurations, pulley widths and styles, the guidelines proceed apace. By point number 6, we’re studying the end cap options. For point 7, the contact surfaces and belt types go under the selection microscope. Finally, the selection strategy pulls all of these discrete planning sections together into one overarching design, which can account for every conceivable loading scenario.

The primary goal here is to support then move a load. That payload can be broken down into a handful of heavy product pieces or into thousands of smaller items. The belt load can even form a long, uninterruptible mass of rocky aggregate or dusty mineral. To further bolster that conveyor pulley selecting methodology, shaft deflection behaviour and belt sag/tensioning reactions are incorporated into the design strategy.

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