Model LWF-18L-V Spiralator
Flexure Scale Loss-In-Weight Feeder
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Spiralator Vertical Lift
Hopper Agitator
Patented tray insert creates a multiple
node, standing (vibrating) wave
which acts to shed any material that
has a tendency to adhere to the conveying
surface.
Nodal Membrane Feeder
Click to see video |
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 Spiralator Vertical Lift Hopper
Agitator creates a patented
feeder system that assures conditioned
and uniform flow of
caking and cohesive powders as
well as interlocking and delicate
flakes. |
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Quick Release Vibratory
Feeder Tray |
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Volumetric Capacity: Up to 80 ft³/hr (2.26 m³/hr) product dependent. Turn down
100:1 Consult factory for higher feed rates.
- Vibrating Feeder Drive: Electromagnetic Drive
-4 (104 mm) wide tray, 115 VAC, up to 40 ft³/hr.
-5 (127mm) wide tray, 115 VAC, up to 60 ft³/hr (Nodal-Membrane Tray).
-7 (178 mm) wide tray, 115 VAC, up to 80 ft³/hr.
- Scale Type: FMSS Flexure Scale System (dead load is mass-counterbalanced)
and LVDT Weight Sensor.
- Scale Capacity (live load): variable Up to 500 lbs (226 kg).
- Hopper Capacity: 2, 4, & 6 ft³, consult factory for larger sizes.
- Accuracy: 0.25% to 1% of set rate ±2 sigma based on thirty 1 minute samples or
1.0% of weigh hopper storage capacity, whichever is greater.
- Automated Test Weight Lifter Assembly (ATWL). Used to automatically
conduct a zero and span calibration
Special Features & Options
The LWF-18L-V Spiralator Loss-In-Weight Vibratory Feeder is designed to operate over a
very wide operating range (typically 100:1), while assuring uniform, non-pulsating flow of
difficult-to-discharge materials, whether they be fine cohesive powders or fragile interlocking
particles of irregular shape. A slowly rotating (typically 2 rpm), non-agitating, conical
wire-spiral within the hopper counteracts the material's tendency to pack under its own
weight by virtue of its lifting action throughout the stored material. The resulting reduction
in consolidation pressures throughout the material mass assures that the stored material will
not develop sufficient strength to form stable arches that can cause erratic flow or complete
flow stoppage. The combination of this unique material conditioning system and a vibrating
pan feeder assures that the material will be handled reliably and gently throughout the entire
feeding range.
Specialized scale design assures reliable, accurate metering.
The heart of any gravimetric feeder is its scale system. The LWF-18L-V incorporates a unique
flexure suspension scale designed exclusively for use on Loss-In-Weight Feeders:
- High efficiency dead load counterbalancing
- Non-tilting platform design
- Tolerant of shocks and overloads
- Mechanical force summing to a single load sensor
- Full range sensor utilization = maximized resolution
- Low mechanical resonance frequency
Conventional platform scales are NOT well suited for this service. Single point platforms are
unsuitable for supporting machinery having this degree of vertical height and elevated mass.
They are very vulnerable to side loading and other tilting disturbances. Multiple load cell
platforms are unsuitable for low loading applications. They are vulnerable to concentrated
overloading by forces no greater than that of an operator standing on one corner of the platform.
Finally, both types of platform scales resonate at frequencies much nearer the disturbing
frequency of the vibrating equipment being supported. While electronic or software filtering
may smooth out signal levels, they offer no protection to the load cells.
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