Quantising machines
AssigneeImperial Chemical Industries PLC
InventorsAnthony Douglas Ridgway, John Hugh Smith, Peter Terrick Stainforth
Life of this patent
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Abstract
A device for controlling the flow of fine powders in a quantising machine includes a pinch valve in combination with a fluidiser maintaining a constant head of fluidised powder. A weigh bucket having a plurality of compartments is rotatably mountable to allow simultaneous filling and discharge. Means for delivering charges of fine powders to receivers rapidly with low change in quantity of the charge, have a power-tight system from the charge measuring means to the receiver, and means for venting the air from the receiver. Accurate net weighing machines for rapidly weighing and delivering charges of fine powders incorporate some or all of the above features in an integrated system.
Claims10
A weighing machine for repeatedly delivering to receivers a predetermined charge of fine powder comprising:
- a fluidizer having an outlet, in which the powder is fluidized and maintained with an approximately constant head of fluidized powder above the outlet at least at the start of each weighing cycle,
- a rotatable weigh bucket mounted on weight-sensing means, said weight-sensing means generating a signal in response to weight in said weigh bucket, said weigh bucket having separate compartments arranged so that by rotation of said weigh bucket each compartment may in turn be positioned for receiving powder from said fluidizer while another compartment discharges its load,
- valve means connected to said fluidizer outlet for controlling the flow of powder from said fluidizer, said valve means being operable in response to a signal generated by said weight-sensing means, and
- means for delivering to receivers the powder discharged from said bucket.
Dependencies are inferred from the claim text.