H
I
R
OLLER
- B
ELT
C
ONVEYORS
7. M
AINTENANCE
H
I
R
OLLER
, M
INI
R
OLLER
, L
O
R
OLLER
& H
I
L
IFE
7.5. L
INER
- B
OTTOM
R
ETURN
P
AN
P115506 R3
103
7.5. LINER - BOTTOM RETURN PAN
The bottom return pan liner is a special carbon impregnated UHMW (ultra-high
molecular weight) plastic. This special plastic is not readily available from most
suppliers. It is usually a special order from a plastic manufacturing supplier.
7.5.1. F
ASTENERS
The bottom return pan liner is held in place with three different methods:
•
Pop Rivets, Fixed Liner
- Prior to 1998: The bottom return pan liner was
held in place by a pattern of pop rivets prior to 1998. The pattern of pop rivets
varies by model, width, and other factors. See Figure 7.23.
Figure 7.23
•
Truss-Head Bolts & Locknuts, Floating Liner
- 1998 to 2002: The bottom
return pan liner was held in place with a truss-head bolt, fender washer, and
locknut (nylon). The fasteners were specially installed to allow the liner to
float. The bottom metal pan was slotted to allow the liner to float, expand, and
contract with temperature changes. See Figure 7.24.
CAUTION
All replacement liners must be replaced with
the original specification of special carbon-
impregnated UHMW plastic.
Damaging static electricity can build up in the
conveyor if this plastic is not used. Static
electricity can cause a spark that could cause
an explosion or fire.
