Weighing scales – With total register – Integrator of steadily flowing fluent material
Patent
1990-01-03
1991-03-26
Miller, Jr., George H.
Weighing scales
With total register
Integrator of steadily flowing fluent material
177145, 222 55, G01G 1114, G01G 1900, B67D 508
Patent
active
050021400
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to the weighing of material. More particularly, the invention relates to a method of, and apparatus for, weighing a continuous stream of fluent material.
According to a first aspect of the invention, there is provided a method of weighing a continuous stream of fluent material which includes
directing the material onto a weighing means which, in the direction of flow of the material is arranged in a plane at an acute angle relative to a vertical plane;
measuring, in a plane substantially parallel to the plane in which the weighing means is arranged, the load applied by the material to the weighing means and generating a first signal representative of mass of the material;
measuring the speed of flow of the material and generating a second signal representative of the speed of flow of the material; and
processing the first signal and the second signal to obtain an output signal which is representative of mass flow rate of the material.
The weighing means may comprise a weigh chute and the method may then include feeding the material into the weigh chute by means of a feed means, at least that portion of the feed means arranged adjacent the weigh chute being arranged at substantially the same angle as the weigh chute and being co-axially aligned with the weigh chute. Those skilled in the art will appreciate that, by arranging the said portion of the feed means at the same angle as the weigh chute, the material arriving in the feed means is stabilised in the feed means and then traverses the weigh chute at a substantially constant speed.
Further, those skilled in the art will appreciate that, by measuring the load applied by the material to the weigh chute in a plane substantially parallel to the plane in which the weigh chute is arranged, the effect of any frictional forces generated between the material and the weighing means is neutralised and it is not necessary to compensate for such frictional forces.
According to a second aspect of the invention, there is provided apparatus for weighing a continuous stream of fluent material which includes
a weighing means which, in use, in the direction of flow of the material, is arranged in a plane which is at an acute angle relative to a vertical plane;
a load measuring means for measuring the load imparted by the material to the weighing means, the load measuring means being arranged at substantially the same angle as the weighing means to neutralise the effect of any frictional forces generated between the material and the weighing means, and the load measuring means being operable to generate a first signal representative of mass of the material;
a speed measuring means for measuring the speed of flow of the material and for generating a second signal which is representative of the speed of flow of the material; and
a processing means for processing the first signal and the second signal to obtain an output signal which is representative of mass flow rate of the material.
The weighing means may comprise a weigh chute through which the material can pass.
The apparatus may include a feed means for feeding the material into the weigh chute, at least that portion of the feed means arranged adjacent an inlet end of the feed means being at substantially the same angle as the weigh chute. The feed means may comprise a feed chute. The said portion of the feed means and the weigh chute may be similarly dimensioned and shaped. Further, the feed means and the weigh chute may be of a material having a low co-efficient of friction. Thus, conveniently, the feed means and the weigh chute may be of polished stainless steel.
The load measuring means may comprise a load transducer which supports the weigh chute.
The speed measuring means may comprise a speed measuring wheel having a ribbed surface on which the material impinges to rotate the wheel, the wheel being arranged at an outlet end of the weigh chute and the speed measuring means may further include a monitoring means for monitoring the speed of rotation of the wheel, the monitoring mea
REFERENCES:
patent: 1883017 (1932-10-01), Sholtz
patent: 4108344 (1978-08-01), Dahlberg
patent: 4166510 (1979-09-01), Hege
patent: 4788930 (1988-12-01), Matteau et al.
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