rulmeca RDR BL3, Technical Manual

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TECHNICAL MANUAL FOR THE RDR BL3 - V1.1 DRIVE ROLLER Rev. 21/09/2018 page 8
4 PRINCIPALS
4.1 Roller distance
The elements that determine the design of a roller conveyor are:
- the dimensions of the package to be conveyed (X and Y)
- the weight of the packages to be conveyed (M).
- the conditions of the surface in contact with the rollers (U).
The correct definition of the distance between the rollers or roller pitch (I) depends on the conformation of the
package to be transported. In order to obtain correct movement of the packages on the roller conveyor, make sure
that the contact surface of the package on the rollers is sufficiently stiff not to deform under the weight of the rollers.
In order to obtain an optimum transfer of the package without jumps or jams, at least 3 rollers must rest on the
material to be conveyed. In general, the more rollers are below the package, the better the linear travel of the
package will be.
WARNING. The maximum radial load of the rollers is indicated in the catalog.
Comply strictly with the conveyable weight limits stated in the definition of the correct roller pitch (I) of the conveyor.
The system designer is responsible (solely responsible) for checking that the maximum load (M) exerted by the
packages on all the components of the conveyor is within the required safety limits. In the case of a Drive Roller
applied to move a conveyor belt, the sum of the upper and lower belt tensions and the tangential force supplied
by the motor (T1+T2) must not exceed the declared load capacity of the Drive Roller.
If the surface of the package subjected to its own weight or through its nature is soft or deformable, provide a
greater number of rollers and a narrower roller pitch (I) in order to distribute the weight as much as possible.
X: Front of package forward conveying Y: Package length I: Roller pitch
4.2 Parallelism, orthogonality and alignment of the rollers
In order to obtain a package transfer that is as linear and rectilinear as possible on the roller conveyor, make sure
that the structure of the conveyor is horizontal (level) and with the support holes of the rollers aligned on one
another both in height and perpendicularly to the direction of travel.
Always make sure that the transferred package is as centred as possible and that its load is distributed as evenly
as possible over its entire surface resting on the rollers.
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