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PL Rollers series - Technical data
Characteristics
The PL roller has been designed with two important principles: to offer the maximum resistance
to a corrosive environment, together with mechanical properties sufficient to sustain heavy
loads on the belt conveyor or caused by the material being conveyed.
The first characteristics has been achieved utilising, for all the external
parts of the roller, materials resistant to corrosion.
The second, is the design of the roller itself as a precision arrangement
and generously dimensioned (whether it is the thickness of the load carrying parts or in
the items in contact with the belt).
The result of this intelligent design has made possible a roller very resistant to the
environment and to chemicals and aggressive materials, and at the same time of surprising
lightness, optimum balance and quietness, that also reduces energy consumption thanks to
the avoidance of any contact parts in the sealing system.
Roller shell
Comprises a high quality rigid PVC tube of large thickness resistant to low and
high temperatures.
In the PLF version the tube shell is in steel machined at either end, to allow the insertion
of the bearing housings.
Bearing housings
They are produced by a high pressure moulding of polypropylene loaded with fibreglass.
This material gives high resistance to corrosion as well as an optimum mechanical resistance.
The end cap is forces with an interference fit into the counter bored section of the tube
to present an united structure that is very robust, light, flexible and above all shock
resistant.
Spindles
Diameters 20mm in drawn steel and ground to guarantee at optimum fit to the bearing.
Bearings
Radial rigid precision bearings with a spherical ball race, series 6204 and internal play
C3 fit.
Seals
Internally we find a labyrinth seal which brushes against the spindly to protect the bearing
from eventual condensation or rusting from the interior of the tube where it is in steel.
The tube when in plastic does not rust and having a good thermic insulation limits the
formation of condensation.
The patented external protection is made from anti-corrosive material: polypropylene loaded
with glass fibre, similar to the end cap.
Resistance to chemical agents
|
Agents |
Polypropylene |
Polyvinyl chloride |
|
Grease, oil |
A |
A |
|
Petrol |
A |
A |
|
Strong alkalines |
A |
A |
|
Weak alkalines |
A |
A |
|
Strong acids |
B |
C |
|
Weak acids |
C |
A |
|
Hydrocarbons |
B |
C |
|
Organic acids |
A |
A |
|
Alcohol |
A |
A |
|
Ketone |
B |
D |
|
A = resistant |
C = in generally sufficiently resistant |
|
D = non resistant |
B = resistant only in certain conditions |
The seal presents a front cover shield, that prevents the ingress to the body of items larger
than 0.5 mm.
The particular self cleaning geometry of the end cap facilitates the rejection of fine particles
by the action of gravity, even when the roller is inclined, meanwhile the centrifugal action
of the roller rotation aids the cleaning process when material arrives in the proximity of
the end cap.
The labyrinth is very deep and divided into two zones separated by a large chamber, which lengthens
the route for and protects the bearing from the ingress of foreign particles.
The wall of the labyrinth of the bearing side is formed in a matter that increases the grease
chamber. The type of grease lithium based water repellent and anti-rusting, providing lubrication
for long roller life.
Final inspection
All HDS rollers are assembled on automatic assembly machines with live test stations that maintains
roller rotation for a sufficient time to distribute the grease into the bearings and all the
other internal components. 100% of the rollers are tested to verify their low-torque characteristics.
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