Machine
Products --> Continuous Mixers
Machine Products:
M - Series Continuous Mixing
INDEX
 M-Series
Continuous Mixing Chambers Feature:
- Sizes from
.15 to 40 cubic feet per minute
- Rugged --
heavy-duty construction
- Simple design --
easy to operate/maintain
- Quick access
mixing chamber door
- Tungsten-carbide
tipped mixing blades
- Test run in our
facility prior to shipment
- Many options
available
- Replacement parts
available from Palmer or from high quality
industrial supply houses in your area. Standard
off-the-shelf components are used wherever
possible so that parts availability is good and
affordable.
- One year warranty
(On-Site start-up assistance not required for
validation of warranty)
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Mixing
Chamber / Motor Head Assembly
 The
mixing chamber is a direct drive design that
eliminates all maintenance associated with timing
belt and gear drive systems. The mixing chamber is
made from heavy walled steel tubing that is
externally reinforced for maximum rigidity.
The mixing chamber
door features quick release knobs that allow for
simple, easy access to the interior of the chamber.
The door is hinged at the bottom and swings down to
allow complete access to the mixing blades and
driveshaft. The hinged door eliminates all ergonomic
and mechanical problems associated with the removal
of fabricated components from the mixer. Mixers
above 3 cubic feet/minute include two chamber doors.
The heavy-duty mixing
driveshaft is made from high strength ground and
polished steel shafting and is direct coupled to the
primary drive motor.
The standard mixing
blades are faced with ¼" thick tungsten
carbide and are either a fixed or adjustable
position blade depending on size. Pin style (fixed
angle) blades are standard on models MI50XL through
MI300XL. Models MI500XL and larger feature threaded
blades as standard with pin style blades as an
option. See the attached mixer specification sheet
for details.
The mixing blades are
overlapping and sized to allow a build up of mixed
material that creates the lining of the inside of
the mixing chamber. This lining provides an optimum
relationship between the end of the blade and the
interior diameter of the chamber. It is constantly
maintained by each blade as the mixing shaft
rotates. With this lining as an intentional part of
the mixing chamber, the daily cleaning consists of
only removing the build up on the mixing blades and
driveshaft. This lining also prevents through
flowing aggregate from constantly abrading the
mixing chamber, thus improving chamber life.
The mixing chamber is
designed to be as rugged yet simple as possible. The
long lasting mixing blades, close tolerance
regenerative lining, and high speed rotation provide
an extremely intense blending action with a minimum
amount of cleaning and maintenance.
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Optional
Aggregate Metering
 Metering
of aggregate into the mixing chamber is greatly
affected by the specific aggregate being processed
and the required feed accuracy. For this reason,
several common metering methods are used:
- Fixed Orifice
Slidegate - Used for consistent, free flowing
materials
- Volumetric
Addition - Used for the highest level of feed
accuracy for particularly fine or non-free
flowing materials
- Adjustable Stroke
Butterfly Valve - Used when a sealed environment
is required and metering accuracy is not as
critical
- Loss-in-Weight
Addition - Used for high accuracy of virtually
any material. This system utilizes high
tolerance load cells and PLC weight addition
control.
Select whichever
method best suites your application.
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Optional
Controls
 For
units that require controls capability in addition
to the basic mixing chamber, all primary electrical
components are housed in a NEMA 12 dust tight
disconnect enclosure. All components are
thoughtfully arranged for ease of operation and
maintenance.
The control system
has a master safety relay with mixing door limit
switch and emergency stop pushbuttons on both the
machine cabinet and the operator station.
There are two modes
of mixer operation:
- "HAND"
– This is a manual mode of operation with
which any or all aspects of the mixer are
operated via two position switches located on
the door of the main electrical enclosure.
- "AUTO"
– In this mode of operation, all aspects of
the mixer are run from a remote panel located at
the operator’s station.
A single three-phase
electrical service is required. An internal KVA
transformer housed in the enclosure provides the
120-volt control power.
- Main enclosure –
Hoffman NEMA 12 Disconnect
- Main control
components – Allen Bradley
- Control
transformer – Acme
- Main voltage
requirements – See Detailed Specification
Chart
- Control voltage
– 120 volt
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Optional
Pumping System
  For
mixing systems that require the accurate addition of
water, resins, or other modifiers, Palmer offers a
broad range of liquid pumping systems. Call with
your specific requirements and we will develop a
system to meet you exact needs. Liquid addition
controls capability range from dc pump motor speed
control to our high-end mass flow pumping systems.
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| Optional
Air Jet Liquid Addition
The use of a
low pressure air jet system for the
introduction of liquids to the mixing chamber
is a common option. The air assist serves two
primary purposes. The first is to keep the
liquid inlets of the mixer clear during the
mixing and purge cycles. The second is to
partially atomize the liquid entering the
chamber to aid in dispersion and mixing.
Each jet
assembly is easily removable making
calibration at the true point of entry simple.
Unlike other systems, calibration with the
M-Series is directly out of the orifice
feeding the mixing chamber, reducing
calibration error.
The air jet
system is fully adjustable via flow controls
located in the air valve enclosure. The
separate NEMA 12 enclosure greatly simplifies
maintenance and reduces the potential of valve
failure due to dirt or impact.
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Spare
Parts
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With our
background of working in foundries we
understand the need for affordable, easy to
acquire spare parts. A fundamental in our
design philosophy is to use commercially
available, standard sized and specified parts
whenever possible. Not only does this make it
easier for us to acquire parts when we build a
machine, but it also makes it easier for you,
the end user, to find replacement parts when
they are needed. We do not hide or remove
original part numbers nor do we specify odd
parts to force you to buy from us. Not only do
we stock commonly used parts so that they are
available next day if required, but also, most
of the parts that we use are also stocked at
high quality industrial supply houses
nationwide.
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