Here's one I'm thinking about so I thought I'd ask the experts:
I have a sand mixer in a foundry that mixes recycled sand, new sand, clay and water continuously. The average time from intake of the mixture to discharge is 1 minute 35 seconds. The mixer is capable of producing between
40 and 125 tons per hour of mixed material.The current system uses an in-place PLC-5 and hardware to constantly sample the sand for the correct 'compactibility' and 'strength'. The controller meters the water and clay to correct and reach the target.
The discharge "door" on the mixer is also controlled by the -5 in three positions.... Open, Closed, and Float. Float is the optimal mixing scenario because the door allows only what material is pushed against it to exit onto a discharge conveyor. This makes for more efficient mixing.
The door's open, closed and float settings are controlled by the mixer motor amperage. A typical setting, at 50 tons per hour, would be 125 amps (close),
135 amps (open), >125 or