Belt Conveyor Roller With Rubber Rings

In the majority of belt conveyors, over and above the normal steel roller, it is necessary to position impact rollers or return rollers with spaced rings and sometimes also self-cleaning return rollers.

Impact rollers

The shock absorbing rollers, more often known as “impact rollers” consist of a base steel conveyor roller design, on which are fitted rings, designed to resist and absorb the pressures given by the impact of materials onto the belt. These rollers are positioned in the carrying section of the belt, corresponding to the point of loading where the material falls onto it.

Impact roller with rubber rings

Impact rollers are used and positioned corresponding to the load points, where the lumps and the weight of material falling onto the belt could in fact cause damage to it. To limit the impact effect of the material onto the rollers, the latter are covered with a series of rubber rings of adequate thickness and resistance.

Impact rollers are under stress not only from the load of the material, but also from the dynamic forces as the load falls onto the belt. The impact onto the belt, arising from the free fall of material will be naturally greater than in the case where the material is deflected onto the belt by an inclined plate.

For the correct dimensioning and the choice of impact rollers in relation to the load check the characteristics of the base roller.

Return rollers with spaced rings

Rollers with spaced rings are used to sustain and support the belt during its return section, where the conveyed material tends to stick to the belt or wherever there is a wear problem or tracking problem of the belt itself.

The rubber rings may function in the temperature range between -20°C and +80°C.

The straight tracking of the belt may be compromised by the type of conveyed material, specially when this material is sticky and thereby adheres easily to the belt surface. In this case, material is also deposited on the return rollers that support the belt, adding an irregular addition of scale to the roller itself.

Our rubber disc return roller with rubber rings

As a consequence, not only wear and tear of the belt occurs, but forces are brought into play to move the belt away from its correct track. Return rollers with spaced rubber rings contribute largely to eliminating the build up of scale that forms in certain conditions on the belt surface.

The rings are pointed, assembled at intervals, in the central part of the roller, where they have the scope to break up the scale which normally is present at the belt center; meanwhile flat rings mounted in groups at the extremities of the belt, support and protect the belt edges, also in cases of limited belt wandering. Return rollers with rings should not be used as belt tensioning devices.

Type1: Return rollers with pointed rings spaced in the central part and positioned in sets at the side. Used on belt conveyors of medium capacity.
Type2: Return rollers used on belt conveyors in high duty plant. They are provided with sets of flat rings, positioned at the roller extremities, and with pointed rings spaced in the central part of the roller.
Type3: Return rollers for return transom sets of “V” design format with base rollers, with characteristic proportional dimensions to the requirements designed into large belt conveyors.

Cleaning return roller

Time after time, conveyed material adheres to the belt surface. If the material is abrasive, it may wear out the roller shell of the normal steel return rollers; if it is viscous, it adheres to the roller itself, promoting dangerous buildup of scale and causing vibration.

A large material deposit may also influence the tracking off of the belt in the return section. Used on the return transom to support the belt when the material being conveyed, even if only a little sticky, is very viscous.

Spiral roller with rubber rings

The helical spiral form of the non-abrasive rings, assembled onto the base roller shell, performs a cleaning action and reduces the tendency of material to deposit itself and stick to the surface of the dirty side of the belt. They may be employed on any part of the return belt section in the case of short conveyors.

On long sections it is satisfactory to employ these rollers only up to the point where the material does not adhere any more to the belt surface. These rollers should not be employed as snub rollers adjacent to the drive or return drums.

The table indicates the types and diameters of standard rings with dimensions according to European norms. On customer request different diameters and dimensions may be supplied.