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See ECS-Series Systems for
state-of-the-art, servomotor-
controlled, piston pump
metering, mixing and dispensing. |
Flying Wedge® HT-Series
Piston Pump Metering & Mixing Systems
Accurate and repeatable system
performance with no unnecessary
sophistication make the HT-Series shot dispensing systems both
affordable and dependable. Driven by a common, linear, adjustable-
ratio wedge mechanism, the piston pumps on these systems are
specifically designed to handle abrasive-filled and unfilled cast
urethane, epoxy, polyester and cast nylon formulations. They are
used in open-casting, vacuum-casting (into molds mounted inside
our custom-designed vacuum chambers,) low-pressure injection,
VARTM (Vacuum-Assisted RTM) and closed-mold RTM resin injection
applications, where mixed material output pressures range from near
0 to 600 PSI.
Metering pump sizes are selected to
match your ratio and output requirements. Accurate
ratio settings are made by selecting the proper angle of the adjustable B component wedge
and locking it down. When the footswitch is depressed, the wedge moves forward,
displacing
linear (on-ratio) streams of A and B component materials to the static (motionless) or
dynamic (motor-driven) mixer. (Outputs: 1 to 35 lbs/min) (Ratios: 1:1 to
1:100)
On the charge cycle, constant positive
material pressure from the tanks drives the pistons
out of their respective cylinders and leans them up against the wedge. This material
pressure
from the tanks is created by nitrogen over-pressure or mechanical feed pumps submerged
in the material or mounted under the tanks. The wedge is not mechanically connected
to the
pistons. Because the wedge is drawn back independently by an air-driven
piston/cylinder or
an optional linear screw servomotor, air and liquid cavitation in the cylinders is
eliminated.
All compartments and heater assemblies are removable slide-out panels. Heaters
are
ceramic-enclosed infrared type. The wedge and piston clevis guides are mounted on
linear
ball-bearing slides for long service life. Component injectors and ratio-taking
ports are located
at the mixer.
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Main Control
Console and PLC
Preset process temperatures for the metering pump compartments
and mixer compartment. The PLC and LCD Operator-Interface provide
user presets for the mixer, shot counter and pot-life alarm timer. With
an optional position sensor built into the wedge drive mechanism, exact
shot-size settings can be entered at an LCD touchscreen. Pressure
and vacuum sensors can be added to the lines and supply tanks to
provide digital process control data. |
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Piston Pumps
When formulations include abrasive aluminum oxide, silica sand
or glass filler in concentrations to 80% by volume, APT's blind-rod
piston pumps handle them with ease. They provide true positive-
displacement with zero pump-slippage for superior ratio and shot-
volume displacement accuracy. |
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Adjustable
Wedge Drives
Our mechanical wedge drive can be infinitely adjusted
and locked in
position to meter on-ratio amounts of 2, 3 or 4 fluid components,
simultaneously, to the dynamic or static mixer. Linear ball-bearing
slides provide in-line support under the wedge drives and under the
piston clevis guides for long-term, trouble-free operation. |
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