Dunham-Bush MM0305F, Руководство по установке, эксплуатации и обслуживанию

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3.0 INSTALLATION
3.17 TIGHTENING OF
PULLEY SET SCREW
Apply one or two drops of thread locked 243
to the engagement area of set screws before
tightening the pulleys according to the
recommended torque.
Set Screw Size Tightening Torque
5/16” [7.9mm] 10 Lbs.ft [13NM]
3/8” [9.5mm] 19 Lbs.ft [26NM]
3.18 PULLEY ALIGNMENT
1.) Insert one end of the string inside the gap
between belt and pulley.
2.) Rotate the pulley so that string is clipped
between the pulley and the belt.
3.) Pull the other end of the string as per
figure below.
FIGURE 3.17:
4.) Inspect for any gap between the string and
pulley at A and B.
5.) If find any gap then adjust either pulley to
make the gap as small as possible.
6.) Repeat steps 1, 2, 3, 4 and 5 for bottom of
the same side, top and bottom of the other
side. (As shown as Figure 3.17)
3.18 BELT TENSION
INSPECTION GUIDE
1.) Measure the belt span (See Figure 3.18).
2.) Position of the “O” ring on the span scale
at the measure belt.
3.) Set the “O” ring on the deflection force
scale to zero.
FIGURE 3.18: BELT SPAN
4.) Place the tension meter squarely on the
belt at the belt span. Apply a force on the
plunger and perpendicular to the belt span
until the bottom of the “O” ring even the
top of the next belt or with the bottom of a
straight edge laid across the sheaves.
5.) Remove the tension meter and read the
force applied from the bottom of the “O”
ring on the deflection force scale.
6.) Compare the force you have applied with
the values in Table 3.18a and 3.18b.
Note: A new drive should be tensioned to the
higher value. After the drive has been running
for 30 minutes, the tension should be checked
and readjust to the higher value, if necessary.
Table 3.18a:
Belt Span Lt (cm) Deflection Td (cm)
25 – 30
31 – 36
37 – 42 0.4
0.5
0.6
43 – 48
49 – 54
55 – 60 0.7
0.8
0.9
61 – 66
67 – 72
55 – 60 1.0
1.1
1.2
79 – 84
85 – 90
91 – 96 1.3
1.4
1.5
97 – 102
103 – 108
109 - 114
1.6
1.7
1.8
Table 3.18b:
Belt
Type
Small Pulley Diameter –
inches [mm]
Maximum Deflection –
lbs [Kg]
A 3.0 - 5.5 [76 – 140] 2.2 – 3.3 [1.0 - 1.5]
B 5.0 - 8.0 [127 – 203] 4.4 – 6.8 [2.0 - 3.1]
C 8.0 - 16.0 [203 – 406] 9.0 – 13.4 [4.1 - 6.1]
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