Belt support rollers and shakers/agitation systems
Belt support rollers
We offer a wide range of support rollers suited for any kind of conveyor application. Please ask, if you are looking for a roller notincluded here.
A roller’s surface may be plain base material like nylon, urethane or cast metal. It can also be lined with rubber.
An axle’s shoulder length can be specified to position the roller under the rods or to compensate for distance variation from the securing point.
Roller types with a vulcanized rubber layer are usually placed in return/carry back positions to prevent rivet head and rod end wear.
A light duty roller can be defined as without bearing or with a single bearing. It must not be confused with light weight rollers. Its functioning is usually only satisfactory if a dual bearing roller types are fitted at all conveyor angle or directional changes.
Cast iron is used as core/hub material of the HS roller line.
A triple seal system is incorporated in the HS roller line: An outer metal cover seal, an oiled felt filler ring and 2 bearings sealed on both sides. Optionally e.g. for beet & tomato juice compatibilty or similar fluids you may specify Vulkolan or ZZ oil seal types. Highest quality 6005 2RS and 6206 2RS ball bearings are used in the HS-line as standard.
Our heavy duty, light weight rollers of the PA-roller line are completely grease filled for lifetime and sealed off with multiple labyrinth type seals. They have been very succesfully used in heavy duty harvesting applications for many years.
Flanged and non-flanged versions of the HS-and PA-roller lines are available.
An S type roller is narrower for elevators with flights, allowing maximum flight length. Bolt head intrusion is avoided if you specify a threaded axle.
Greasable roller versions: Only possible with threaded spindle/axle and nut & lock washer. Axle length can vary to your specification. Contains open sided bearings with internal grease chamber reservoir. A metal seal cap covers one end and the open flange side cap allows excess grease to escape. Greasable rollers are fitted with Nilos type seals and the steel caps are retained by expanding snap
rings. They are suited to hand or auto-lube applications.
Threaded axles : Standard thread size M16 (5/8”), M18 (11/16”) or M20 (25 mm spindle O.D.) are optional.
Open bore axles : Standard thread size M16 (5/8”), M18 (11/16”) or M20 (25 mm spindle O.D.) are optional.
Shakers are available in cast iron and rubber.
The triangular shape offers a good eccentricity effect. The peripheral speed of the shaker is relative to the belt speed.
Cast iron shaker types are designed to be rod driven. They are therefore rod pitch related and need positioning in the sprocket run area. Careful alignment is needed if the rods of a belt are cranked.
The rubber type shakers are positioned under the belting. They are pitch independent.
Belt width determines the axle stand-off/shoulder length. Please specify when ordering.
All types contain dual bearings with our standard triple seal system as in HS type rollers, only the axle length differs. Shakers are usually ordered as open bore for a M16 or M18 bolt.
Centrally mounted pairs of shakers need to be mounted with long, high tensile strength bolts which must be capable of high shock stresses.
High frequency agitation with less vertical movement can also be achieved by mounting a pair of non flanged, rubber covered rollers under the conveyor’s sprocket run area. They may be fitted to height adjustable arms for variable effect, or in a fixed position. The degree of movement is regulated by the roller diameter, rod diameter and rod pitch. These rollers may also be incorporated in a power driven shaker system where they are mounted onto arms with a reciprocating vertical motion relative to the conveyor´s moving plane.
Half round nylon blocks (at your specified distance) instead of rivet retaining plates can be fitted to the conveyor. This is another (fixed frequency) agitation method. They are usually used with low profile belting, exposing only 4 mm of their 8 mm thickness. Such conveyors are best supported by rubber covered rollers.
Conveyor agitation should not be located at any change in angle, e.g. a pivot point, because any extra belt tautness would create an undesired ‘dampening’ effect.