Weighing scales – With total register – Integrator of steadily flowing fluent material
Patent
1994-03-07
1998-11-10
Williams, Hezron E.
Weighing scales
With total register
Integrator of steadily flowing fluent material
177 2513, 177116, 177145, 222 55, G01G 1114, B67D 508
Patent
active
058347070
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/CH93/00091.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to apparatus for the continuous monitoring of flowrate of bulk material and the continuous weighing of bulk material.
2. History of the Prior Art
Numerous types of such units are known, such as reflected in Patent EP 0 299 103 A1 and DE 35 41 872 C2. The two cited patents are representative of those units in which bulk material is allowed to fall from a defined height upon a deflector plate which has been arranged at an angle to the vertical, with the flexural moment generated in the process being determined within the flexible joint of the deflector plate. The deflector plate arrangements described in these patents have certain defects which result in relatively severe inaccuracies in measurement in the case of one and the same bulk material and which make problematical use of the same unit for a variety of materials, such as in dosing processes. Because, in the cited patents, moments are measured, it is not only the impact force which is generated via changes in pulsing which is decisive, but also the specific location where the bulk material impacts the deflector plate. In this instance, considerable variations are possible, depending upon the nature of the material involved. Furthermore, the type of momentum transmission involved is essential--the degree of force transmitted is greater in the case of elastic impact than with inelastic impact. The specific impact rate, which must be taken into consideration, also varies with the type of bulk material involved and the condition of the bulk material at a given moment. The units described in these patents provide satisfactory results with respect to the bulk material to be weighed only through calibration.
SUMMARY OF THE INVENTION
An objective of the present invention is to overcome the disadvantages of the units described above with a scale which provides precise information on the time-sequenced amount of materials being advanced for weighing regardless of the quality of the bulk material involved.
Apparatus constructed in accordance with the present invention includes means for supplying bulk material at a predetermined velocity and a slide positioned to receive the bulk material from the bulk material supply means and disposed at an angle to the horizontal over which the bulk material moves and onto which the bulk material exerts a force having a component perpendicular to the slide. Also included are first and second spaced apart, vertically disposed plates positioned at a lower end of the slide between which the bulk material passes and against which the bulk material impacts with a force having a horizontal component as the bulk material passes between the plates. This apparatus further includes first sensing means for sensing the component of the force exerted on the slide by the bulk material moving over the slide perpendicular to the slide and second sensing means for sensing the horizontal component of the force produced by the bulk material impacting against the vertically disposed plates as the bulk material passes between these plates. Also included in apparatus constructed in accordance with the present invention are means for conducting the bulk material passing between the vertically disposed plates to utilization equipment and means responsive to the first sensing means and the second sensing means for determining: (1) the amount of bulk material passing over the slide and through the space between the vertically disposed plates over a prescribed period of time when this apparatus is arranged as a scale, or (2) the flowrate of the bulk material passing over the slide and through the space between the vertically disposed plates over a prescribed period of time when this apparatus is arranged as a flowmeter.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention and for further objects and advantages ther
REFERENCES:
patent: 1883017 (1932-10-01), Sholtz
patent: 3944004 (1976-03-01), Lafitte et al.
patent: 5002140 (1991-03-01), Neumuller
patent: 5230251 (1993-07-01), Brandt, Jr.
patent: 5409020 (1995-04-01), Belvederi
Gibson Randy W.
K-Tron Technologies Inc.
Williams Hezron E.
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