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Weigh Scale Automation Systems
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A weigh scale
system is an excellent choice when a high degree of accuracy
is required. Many molders choose a weigh scale system when small
parts need to be packed into shipping or storage containers,
because it minimizes the chances of too few parts being packed
because of machine failure, bad shots, etc. |
Automated weigh scale systems such as this, are sized to meet your container and floor space requirements. Systems include selected EMI under press and beside press
conveyors (one with a weigh scale and photo-eye) and a customized control system.
A Note About Static Electricity: EMI’s standard weigh scale control system employs special circuitry to minimize interference from static
electricity. Among the several brands of weigh scale systems available, we have found this system to be superior in operation at typical plastic processing plants.
Some molders add an ionizing unit to further reduce interference, particularly when molding nylons and styrenes. An additional benefit to using an ionizer is reducing
dust and dirt attraction to parts.
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Sequence of Operation
- The empty box is conveyed onto the scale and positioned by photo-eye
- Empty box tare weight is deducted by the control system
- Under press conveyor runs until the preset weight has been conveyed into the box
- At preset weight signal, the controls:
• momentarily stop the under press conveyor...
• start the scale conveyor to move the full box while positioning an empty one . . .
• repeats the tare deduction and other sequences
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Options
- "No Empty Box Alarm" and "Alarm Condition" Indicator signals no container in next fill station and separate light indicates
situation hasn't been corrected
- Weigh Scale, Two Speed Cut-off for multi-cavity molds. Increases reliability of fill weight. Variable speed drive and two weigh set points provide
a "creep" speed near fill weight to trickle in parts until shut off at fill weight
- Floating Beam Load Cell
- “Full Box” alarm signals there is no more room on the conveyor for filled boxes
- Strobe lights for Full Box & Empty Box Alarms
- Under the Press Indexing.
- Inspection Cycle (includes Under Press Indexing)
- Process Control Tie-in
- 230/60/1 or 220-240/60/3 electrics
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Weigh Scale Controls:
The NEMA 1 enclosure includes a weigh scale push button control and display for the platform. A cleat-sensing limit switch, mounted on the empty box holding
conveyor, ensures positive container movement. A photo-eye assures correct positioning. Also included: on/off switch, manual reset button, programmable
control and interfacing relay.
A recommended option is the No Empty Box alarm, with Alarm Condition indicator. |
Simple Installation:
Once the under press and beside press conveyors are positioned, the system can be plugged in. Conveyors, weigh scale and photo-eye are pre-wired into the
control system. The under press conveyor plugs into the control system. The operator then simply enters the desired weight or piece count into the scale control.
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