SECTION 2 - GENERAL INSTALLATION INFORMATION
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
2-13
The narrower belts are designed for compactness of
drive, drive economy and reduced overhung load.
Banded belts are single belts unitized with a
common cover to prevent belt whip or turnover.
Banded belts fit all standard sheaves, however,
banded belts should be limited to only 2 or 4
individual belts banded together.
If the motor sheave is to be located directly
ABOVE the countershaft or within 30° of the
crusher vertical centerline, the factory must be
informed as to the position of the drive sheave, so
that the OUTER countershaft bushing can be
properly installed.
The Crusher may also be direct driven, that is,
coupling connected to a driving motor.
Any problems related to the crusher drive should be
submitted to the factory for suggestions.
2.7 Crusher Motor
The recommended electrical driving motor is a
crusher duty squirrel cage induction motor;
continuous rated, with normal starting torque
(approximately 125%) and normal breakdown
torque (approximately 200%) with 10%
acceptable voltage variance. It is recommended that
crusher motors of the horsepower used with MP
Crushers be equipped with reduced voltage starters.
Abrasive resistant insulation and stator thermostats
(an internal protective device) are suggested. The
motor can either be open drip-proof or totally
enclosed fan cooled.
To maintain continuous service of the
recommended operating horsepower level shown
on the mounting and clearance drawing, an electric
motor with 1.15 service factor is required. If a
service factor of 1.0 is used, the horsepower rating
appearing on the motor’s nameplate should be
approximately 15% higher than the recommended
operating horsepower. However, the crusher power
draw is to be held to the horsepower shown on the
mounting and clearance drawing.
With the V-belt drive, slide rails under the jack
shaft drive base are required to provide allowance
for the V-belt take-up due to belt stretch and for belt
installation.
If a direct drive is used, care should be taken when
ordering the motor that the motor shaft extension
and bearings are adequately sized for a direct drive
application. The motor shaft diameter must be able
to withstand peak torque. The motor manufacturer
should contact Metso Minerals regarding the gear
mesh frequency for motor design. The motor will
also require special consideration for shock and
vibration.
All horsepower ratings referred to on mounting and
clearance drawings are based on electric
horsepower.
2.8 V-belt Drive
It is important that this entire section be completely
read before installing and tensioning the V-belt
drive.
2.8.1 Initial Installation of V-belt Drive
For the initial installation or when reassembling the
V-belt drive, proceed as follows:
1. Clean all oil, grease or rust from the sheave
grooves.
2. Make certain that the sheaves are correctly
aligned and that the shafts are parallel.
3. Never force belts onto sheaves. Always
shorten the center distance until belts can be
slipped on easily. To determine the
minimum allowances for shortening or
lengthening the center distance between
sheaves, see Table 2-5.
After calculating a center distance from a
standard pitch length make provision that
the centers can be moved closer together by
the amount shown in Figure 2-8 and
Table 2-5 to facilitate installing the belts
without injury. Also, the centers should be
adjustable over the calculated distance by an
amount as shown in the last column of
Table 2-5 because of manufacturing
tolerance and possible stretch and wear of
belt.
4. Always use a matched set of belts and use
new belts of the same manufacture. Never
mix worn and new belts.
5. Frequently check the tension on a new drive
during the first day of operation.
Summary of Contents for MP1000
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