How to Judge the Wear Resistance Performance of Pulley Rubber Lagging

October 15, 2019

Inside a conveyor system’s mechanical innards, wear fatigue issues plague hard-worked power transmission assemblies. Would it then surprise you to know that similar issues take place on the deck of the equipment? With the tensioned belt representing an unstoppable force and the pulley mounts performing as unmovable machine parts, it’s the drum lagging that suffers. And, as long as this no-win contest continues, that rubber lagging will experience material-eroding wear.

The Fight to Maintain Pulley Integrity

Pulleys are fabricated from tough stainless steel. They’re not going to experience much load-induced stress, at least not right away. Similarly, conveyor belts are made of tough but flexible materials. Rubber or metal-plated, the ribbons will manage their load. Even if a fatigue issue does occur on the belt, it’ll soon make itself known. A maintenance engineer can then action some kind of repair work. Underneath, though, between the belt and the drum, a wear resistance performance drop, which is taking place on the pulley lagging, is about to cause a major system upset. As the rubber drum lagging erodes, the belt slips. Load transportation efficiency is the next operational attribute to suffer. The traction, the grip coefficient between the pulley and the underside of the conveyor ribbon, experiences a marked decrease in towage power. The equipment is clearly experiencing a lifespan curbing event here.

Evaluating Wear Resistance Performance

On busy conveyor equipment, especially the gear that operates as a company beast of burden, wear resistance issues can seriously undermine a working transport line’s performance rating. The rubber lagging surrounding the drum cylinders becomes so threadbare that it no longer engages the belt underside properly. Traction problems are on the rise. System energies are being lost as frictional heat. A slight click, which usually occurred when the powertrain shifted into gear, has recently become an ear-piercing squeal. To evaluate matters, to see how bad the issue has become, service engineers look for observable fatigue identifiers. If the equipment is overloaded, that loading factor is noted. Moving on from here, the tech measures belt slippage. With these two factors in-hand, an abrasion index is gauged.

True, it’s not quite that simple. For one thing, the material characteristics of the belt material and rubber lagging will also impact wear resistance performance. The tensile strength, hardness, and elongation resilience of the elastomeric ribbon are assessed as well. Likewise, the same factors are applied to the lagging rubber. Now, since all of the material properties are plugged in, the deck loads and belt tensioning forces are added, too. Finally, with a slippage measurement added to the engineering mathematics, a wear resistance performance rating is assigned to the equipment.

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