H
I
R
OLLER
- B
ELT
C
ONVEYORS
5. I
NSTALLATION
H
I
R
OLLER
, M
INI
R
OLLER
, L
O
R
OLLER
& H
I
L
IFE
5.4. B
ELT
I
NSTALLATION
P115506 R3
49
• The belt must be tightened to the proper specifications. Belt tension must be
checked daily for the first several days, and then weekly until the belt has sta-
bilized and adjustments are not required. This may happen quickly or over the
space of a couple of months.
Note:
Take-up rods are designed for belt tightening only, although slight (1/8”) tracking
adjustments can be made with them. More drastic tracking should be done by
adding or removing shims from under the pillow block tail bearings.
The top leveling rods must only be used to level the tail section. For proper use of
the tensioning and leveling rods, see Section 5.5.
T
O
PERFORM
BELT
TENSION
PROCEDURE
Materials needed:
•
Model 26 and larger:
three 2” x 4” boards just shorter than the trunking
width.
Models 22 and smaller:
three 1” x 4” boards
• 1 set of 200 lb weights
• 1 ruler / tape measure
1. Belt tension can be measured between any 2 idlers, but it is best to be at
least 2 to 3 idlers away from the head and tail sections.
2. Remove
the
covers from the test area.
3. Place one board over each idler under the belt with the inside edges
centered over the idler shafts.
4. Measure
the
distance
between the nearest edges of the support boards. This
span should be 5’.
5. Measure the distance “X” from the top of the trunking to the unweighted belt.
6. Place
the
third
board centered between the support boards.
7. Place 200 lb weight on the center board.
8. Measure the distance “Y” from the top of the trunking to the weighted belt.
9. Compute belt deflection = “Y” - “X”
10. Adjust belt tension equally on both sides of the take-up until the belt
deflection is within the given range listed on the pedigree page insert. The
minimum amount of belt tension should provide good operation. However,
under certain conditions the head pulley may slip. In those instances, add
tension until the slippage stops, then measure the belt defelction to confirm
that it is still within the suggested range.
Alternate method for short or limited access conveyors:
1. Locate 2 idlers that are 60” apart. Remove cover.
2. Measure the distance “X” from the top of the trunking to either side of the belt.
3. Cut a board the same length as the center horizontal tube of the idler. Place
this board across the belt in the center of the span and center of the belt. Add
200 lb weight.
4. Measure the distance “Y” from the top of the trunking to the same side of the
belt as previously measured.
5. Continue from step 9 above.
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