The machine accurately doses gold and silver grains for the prodcution of bullions and cast bars.
The Preci-dos is completely automatic, with dosing cells and grains transfers completely controlled by PLC.
The machine has a number of steps to achieve accurate control on final weight.
The grains container in the machine are loaded by gravity into the pre-dosing scale, to approach the final desired weight.
After the pre-dosing step, a second phase starts to reach the final desired weight by adding a controlled quantity of gold or silver wire or powder (depending on customer specification) and the discharge the correct quantity of material into a container.
To maintain accuracy and productivity, the machine is capable of self-learning, based on the continuous use. In particular the machine can statistically anticipate the average drop time of a single grain, to avoid overshoot.
The final weight is done using a precision load cell METTLER or equivalent:
Precision: -0 ÷ +0.02g from 100g to 1000g
Productivity: up to 500 weight/hour (for 100g)
An operator or an automatic system can pick-up the weighted material in the container for the next operation.
The machine is easily programmed using a touchscreen HMI, with thr possibility to store recipes and manage alarms
SS 304 construction for all parts in contact with precious metal