Dings Magnetic Group PERMANENT DEEP DRAW DRUM User Manual
BULLETIN NO. 1126F
DATE: 5/13
PERMANENT
DEEP DRAW DRUM
INSTRUCTIONS
DESCRIPTION
The Deep Draw Drum is a self-cleaning permanent type magnetic
separator that’s designed and constructed specifically for very
heavy duty applications. It separates small and large pieces of
ferrous material from products such as solid waste ash, shredded
automobiles, slag and crushed ore.
This large and powerful magnetic drum operates as a motor driven
stainless steel shell revolving around an internal stationary magnet
and shaft assembly. Material to be separated is fed against the
shell that’s protected by a heavy duty manganol steel wear cover,
welded in place. Magnetics in the field are attracted to the shell, and
held against it until reaching a discharge location. The separated
magnetics are then automatically released.
The Deep Draw Drum is available from Dings as a drum only, or with
a complete horizontal I-beam support frame that includes a drive
motor, drive chain and a guard. Two shaft clamps and a magnet arc
adjusting arm are included with the drum assembly in either case.
CAUTION: STRONG MAGNET
Strong magnetic field may have an affect on pacemakers and other
electrical devices. Please contact the device manufacturer for further
information. Be careful with hand held tools near it, whether the
drum is operating or not. Stay away from moving members when it
is operating.
Always switch off the drive motor and magnet before adjusting
any part on the drum, the drive or the support structure. A motor
lockout system should be used during servicing
-
during any
adjustments and during any maintenance.
The internal stationary magnet assembly projects a powerful
magnetic field through the drum shell, and out into the space
several inches away from the shell. Be cautious when handling or
even carrying tools near the shell. If a tool that’s made of magnetic
metal (most steel alloys are) is brought within the magnetic range, it
can be attracted suddenly and with great force towards the shell.
The magnetic field is highly attractive, and is always present.
Magnetic performance may be affected by magnetic material in the
field. This includes such items as i-beams, metal supports, hoppers,
or splitters. These and other ferrous objects need to be kept out of
the magnetic zone.
OPERATING TEMPERATURE:
Ceramic magnets: -40°F through 250°F (-40°C through 120°C).
Rare earth magnets: 176°F (80°C) or less.
NOTE: Extreme temperatures may affect the performance of the
magnet. Refer to Bulletin 1214T.
IMPORTANT
This instruction bulletin has 2 sections. Section 1 covers the
installation and operation of the Deep Draw Drum assembly only
supplied by Dings without a support frame. Section 2 covers additional instructions about installing and operating the drum when it’s
supplied by Dings with a support frame.
Read Section 1 before installing either a drum assembly or a drum
assembly that has a Dings supplied horizontal support frame.
4740 W. Electric Ave. s Milwaukee, WI 53219 s 414/672-7830 s 414/672-5354 Fax s www.dingsmagnets.com
MOUNTING - DRUM ONLY
Check all packaged material for shortage of parts and possible
damage. Report shortages or damage to the delivering carrier.
The drum assembly is usually shipped banded to a wood skid.
The Deep Draw Drum is shipped assembled and ready to mount on
a support structure provided by the installer or user at the work site.
Bolt the lower sections of the 2 split shaft clamps that were included
with the drum shipment to the support structure as shown in Figure
2. Slotted holes are recommended in the support structure to allow
lateral adjustment of the drum. Any vertical adjustment that might
later be needed can be handled with shims (not provided by Dings).
SECTION 1
Figure 1
IMPORTANT
If the separator consists of a drum assembly only, it will be up to the
installer or user to furnish mounting, framing and drive components.
If a Dings horizontal support frame was supplied by Dings, read
Section 2 after reading Section 1.
Tighten the lower sections of the shaft clamps, and then slowly
lower the drum into them. When the shaft is supported in the lower
sections, bolt the upper sections loosely in place as show in Figure
3. Do not tighten the upper sections at this time, because they must
be loose to rotate the shaft while adjusting the magnet arc, as
explained next.
ADJUST MAGNET ARC - DRUM ONLY
The Deep Draw Drum is shipped with the internal magnet assembly
in the lowest or resting position as shown in Figure 4. After the
drum is mounted, the position of the internal magnet must be
adjusted to set the external magnetic arc in a correct operating
position.
Several possible arc positions are shown in Figures 5, 6 and 7. A
selected position for your application was predetermined before
shipment. It was based on the location of your feeder, and on other
application factors. Be sure you know which arc position was determined for you installation, before adjusting the internal magnet as
explained next.
Follow these steps when adjusting the magnet arc the first time:
1) Check bolts holding the upper sections on both shaft
clamps. The upper sections should be loose, but don’t
remove the bolts.
2) Mount the adjusting arm that was packed with the drum, on
either end of the drum shaft, in a horizontal or slightly below
horizontal position.
3) Use a come-along, winch or crane as shown in Figure 4
to raise the adjusting arm to a magnet position that was
predetermined for your installation. An arrow is stamped
on each end of the drum shaft. It indicates the center of
the magnet arc. The center is magnetically the strongest
location across the drum surface.
4) When the magnet position is correct, tighten bolts in the
upper sections on both shaft clamps while the adjusting arm
is held in position by the come-along or crane. If more
adjustment is needed, repeat steps 1 through4.
5) After a magnet position is set, remove the come-along or
crane, and also the adjusting arm.
It may be necessary later to reposition the arc slightly for peak
performance after material is run on the drum. Repeat the 5
adjusting steps for peak performance, but during Step 3, check if
the adjusting arm should be moved down slightly instead of up.
After the arc is finally set, consider leaving the adjusting arm on the
shaft, and welding a steel plate on the drum support structure to
act as a rest. This will prevent the internal magnet assembly from
slipping out of position, if the shaft clamp bolts accidentally loosen
from vibration.
FEED TO DRUM
Peak performance depends not only on the position of the magnet
arc. It also depends on these features: size of feed materials; distance or gap between the feeder and drum surface; rate of feed;
how constant the rate is kept; and whether the feeder trough is
made of a nonmagnetic type metal.
The feeder trough or plate must be made of a nonmagnetic metal
such as Series 300 stainless steel. If instead it’s made of common
carbon steel, the portion that is situated within the magnetic field
(inside the arc) will become magnetized. When this happens,
efficiency of magnetic separation goes down.
If your drum will be fed as in Figures 5 or 6, the gap between the
discharge edge of the feeder and the drum shell is important. It must
be wide enough to allow all nonmagnetics in the feed to fall through
while the drum is operating. It must not be too wide which can
cause a loss of magnetic material.
The maximum width of the gap depends on the magnetic strength
of the drum which is a function of diameter. No specific gap
dimension is included in this bulletin. The gap for your installation
was predetermined at the time of drum selection. Be sure you
know what the determination was.
If your drum will be fed as in Figure 7, the distance between the discharge edge of the feeder trough or plate, and the shell below,
should be as short as possible. Feed material must not be allowed
to drop more than a few inches against the shell, to avoid denting
the shell. A dent can damage the internal magnet assembly. If the
feeder has to be higher above the drum, install a nonmagnetic stainless steel chute at an angle that will allow the feed to slide down to
the shell.
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