|
Options
- Attrition
Mill Dust Hood
- Rotary
Drum Magnetic Separator
- Cooling
Tube Bundle for Classifier
- Pneumatic
Transporter
- High
Efficiency Dust Collector
- Shakeout
Deck
to feed or replace vibratory attrition
mill
Attrition
Mill
The
R-Series Attrition Mill is a rugged,
heavy-duty unit that is designed to provide
constant, reliable reclamation, year after
year. It is a top loading mill that contains
no cross bars or grates that interfere with
inspection of the primary screen or removal of
tramp metal, gaggers, etc.
The
attrition mill utilizes a dual screen
agglomeration reduction system that is
comprised of two perforated steel plates. The
first is located in the bottom of the mill in
the primary chamber and permits only loose
sand and small lumps to feed into the
secondary chamber. The second screen is
located at the discharge flange of the
secondary chamber and the discharge housing.
It allows only grain size sand to exit the
mill. Both screens are easily replaceable.
The
attrition mill utilizes an adjustable output 3
phase vibrator which is bottom mounted to
provide maximum agitation of the sand mass.
Vibrator horsepower ratings for the R-1, R-3,
R-5, and R-10 are 2, 4, 5, and dual 5
horsepower, respectively.
The
attrition mill includes as standard a three
sided tapered load frame to aide in loading
efficiency.
The
attrition mill is outfitted with a simple door
arrangement for the cleaning and service of
the primary screen.
 Feed
Elevator
The
R-Series comes standard with a rugged bucket
elevator used to transfer reclaimed sand from
the discharge of the attrition mill to the top
of the screener hopper. The elevator is easy
to maintain and spare parts are available
off-the-shelf.
This
elevator was specifically designed by Palmer
for use with foundry sands. Construction is
extremely heavy and maintenance access is
complete with each section of the elevator
having full height access doors. Unit features
a standard OEM gear head drive.
Screener
 Prior
to classification, all reclaimed sand passes
through a durable screener assembly. This
screen provides the third level of screening
to the sand. This is the removal point of all
material larger than grain size. The screen
tramp discharge feeds out a flanged chute into
the customer's choice of tramp material
containers (barrel, box, bin, etc.)
Screening
is accomplished using a high frequency
pneumatic vibrator rigidly mounted to the
screener. The added vibration speeds the
screening process and segregates agglomerated
materials like compound grains, shell sand
core remnants, metallics, and the like.
The
screener hopper includes a 4" dust
takeoff designed for 200 cfm of dust
collection.
Classifier
 The
R-Series fluidized bed classifier is
fabricated from 1/4" section steel and
utilizes a constant pressure blower for
fluidization pressure. The blower eliminates
fluidized bed membrane saturation problems
associated with the use of compressed air.
A
6" diameter exhaust is provided for
connection to an existing dust collection
system.
Sand
that is discharged from the classifier is
ready for use. The discharge of the classifier
can be configured for use with a bucket
elevator, pneumatic transporter, dump hopper,
etc.
The
classifier is constructed from three major
components:
- A
base, or plenum chamber, into which
fluidizing air is blown by a blower.
- A
fluidizing plate constructed of ASTM A-514
Abrasion Resistant Steel
- A
main body, which serves as a cover and
pressure chamber
The
plenum chamber serves not only as a base, but
also a means of distributing the incoming air
to the underside of the fluidizing deck. The
deck is a steel plate filled with
self-cleaning, covered orifices through which
the air is passed in order to fluidize the
sand resting on it.
The
main body is mounted on top of the base
(plenum chamber). It serves not only as a
cover, but also as a classifying chamber.
 The
fluidizing action of the sand assists in
polishing each grain, removing the fines
produced by the casting process and transport
of the sand. A negative pressure maintained
over the bed by a dust collector (supplied by
the customer or as an option) and controlled
by a gate located between the collector and
the classifier ensures that the fines are
removed from the chamber and around the sand
grains.
Fluidizing
air is provided by a constant pressure blower
driven by a TEFC motor that includes an inlet
damper control. Inspection and cleaning
panels, flanged discharge, 6" dust
collection take-off, and air manifold
connections are included.
Controls
 All
electrical controls are housed in a dust tight
NEMA 12 enclosure. Electrical control
components are based on the NEMA standard of
controls. The controls feature two modes of
operation.
- "HAND"
in which each aspect of the system is
controlled by switches located in the door
of the primary electrical enclosure.
- "AUTO"
in which the system is activated by a push
button located in the door of the
electrical enclosure. The system starts
and stops itself automatically based on
internal sand level sensors.
 When
the system is activated in automatic, the
classifier operates on a continual basis. A
high level proximity switch located in the
elevator discharge controls the operation of
the attrition mill and elevator, maintaining a
constant supply of sand to the classifier.
Ultimately, this high level controls also
prevents plugging and damage to the elevator.
The
control system has a master safety relay and
emergency stop pushbutton on the machine
control enclosure.
System
Operating Requirements
- 240/480-V,
3-Phase
- Compressed
Air - 1/2" Line @ Nominal 90 PSI
- Dust
Collection for System - 2000 CFM -
Connections to Attrition Mill Discharge,
Elevator Head, Classifier
Options
- Attrition
Mill Dust Hood
- Rotary Drum
Magnetic Separator
- Cooling Tube
Bundle for Classifier
- Pneumatic
Transporter
- PSL
Style - The Palmer PSL Sand Lifter is
a small, dilute phase pneumatic
transporter with capacities of 3 or 6
tons per hour and is ideal for short
or low usage installations.
- Klein
Plug Flo Style - The Plug Flo
Transporter is ideal for high usage,
high tonnage installations requiring
the least amount of fines generation
with minimal maintenance. Available
for virtually and tonnage requirement.
- High
Efficiency Dust Collector
- Shakeout
Deck to feed or replace vibratory
attrition mill
|
The
R-Series is Palmer's original and most robust
Mechanical Sand Reclamation system. The R-Series
features a super duty attrition mill with
replaceable wear plates and screens. The
attrition mill also comes with standard primary
screen cleaning doors. The high efficiency
classifier does an outstanding job of fines
removal. The unit also features, as standard,
a Palmer built bucket elevator designed specifically
for foundry sands. The R-Series is sold as an
integral system including all necessary components
for complete system operation. Capacities from 1
to 10 tons per hour
