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 tubing that is
externally reinforced for maximum rigidity and stiffness.
The mixing chamber doors feature heavy-duty
quick release knobs that allow for simple, easy access to the interior of
the chamber. The doors are hinged at the bottom and swing down to allow
complete access to the mixing blades and driveshaft. The hinged doors
eliminate all ergonomic problems associated with the removal of fabricated
components from the mixer.
The heavy-duty driveshaft is made from ground
and polished-stress proofed steel shafting and is direct coupled to the main
drive motor.
The mixing blades are faced with ¼” thick
tungsten carbide and are a fixed position blade with predetermined angles
and head heights. This greatly simplifies the replacement process and
eliminates the need for constant blade inspection and adjustment found with
other blade designs.
The mixing blades are overlapping and sized
to allow a build up of resinous 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 wear as it occurs. 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.
The mixing chamber is designed to be as
rugged yet simple as possible. The fixed position mixing blades, close
tolerance regenerative lining, and high speed rotation provide and extremely
intense blending action with a minimum amount of cleaning and maintenance.
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Controls
All main electrical components are housed in
a NEMA 12 dust tight disconnect enclosure. All components are thoughtfully
arranged for ease of operation and maintenance.
A small enclosure is located at the operator
station and contains the control switches needed for automatic mixer
operation.
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 which any or all
aspects of the mixer are operated via two virtual position switches,
located on the HMI in the door of the 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 external KVA transformer housed in the enclosure provides the
120-volt control power.
Four speed settings are included. Speed setting is quick and easy
for each level.
All timer functions are controlled by a PLC: pump on / off delays, slidegate on / off delays,
calibration timer, etc.
- Main enclosure – Hoffman NEMA 12 Disconnect
- Main control components – High Quality
- Control transformer – High Quality
- Main voltage requirements – 60 Amp 240/480 3 Ph 60 Hz
- Control voltage – 120 volt
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Pumping System
The pumping system is housed in a separate
enclosure to protect the components from the plant environment. The
system will consist of:
- Two magnetically coupled pumps
- Two fast action stainless steel air
actuated 3-way valves
- Optional piston type catalyst metering pump for 3 part PUNB systems
The pump motors provide consistent output RPM across the operating range.
The pumps are direct coupled to the drive
motors to eliminate the inaccuracy found in chain, belt, and gear reduction
couplings. The direct in-line coupling also eliminates all side load on pump
bearings and packing extending the life of the pump.
Fast response air actuated 3-way ball valves
provide instant routing of chemicals to the mixing chamber.
A low pressure air jet system provides a low
CFM air flow to help introduce the chemicals into the mixing chamber and
keep the mixing chamber resin ports clear. The air jet system is fully
adjustable via flow controls located in the electrical enclosure.
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Standards
Recirculating Pumps
- The resin pumps run continuously and the three way ball valves
divert to the mixing chamber when called on. This system is helpful in
maintaining resin temperature.
Calibration Timer with Remote Start / Stop
Buttons
- The calibration timer is included with
the PLC System. The PLC controls the pump on / off delay timer, slide gate
on / off timer, purge timer, etc. This
system has proven itself to be very reliable and easy
to use.
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Mixer Specifications
| Feature |
Standard
Specification |
| Capacity* |
70 - 250 Pounds Per
Minute |
| Capacity* |
2.1 - 7.5 Tons Per Hour |
| Standard Mounting |
Fixed Position |
| Standard Electrical and
Pump Enclosure Location |
Back Plate Mount |
| Mixing Chamber Door |
Dual Bottom Hinged
Doors with Quick Access Knobs |
| Mixing Chamber Length |
41" |
| Mixing Chamber Inside
Diameter |
5.6" |
| Mixing Chamber Wall
Thickness |
.43" |
| Sand Metering Device |
Fixed Orifice Slidegate |
| Standard Drive Motor
Sizing |
5 HP -
1150 RPM |
| Standard Mixing Blade
Style |
Pinned (threaded
available) |
| Driveshaft Diameter |
2.5" |
| Standard Electrical
Service Required |
30/20 Amp 240/480
Volts - 3 Phase Supply |
*Based on new, clean, silica sand with 3 part phenolic
urethane no-bake resin with a max. addition rate of 1.5% based on sand
weight.
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