Weighing scales – With testing
Patent
1987-02-06
1988-03-08
Miller, Jr., George H.
Weighing scales
With testing
177123, 198505, 198577, 222 55, G01G 1302, G01G 1108, B65G 3700
Patent
active
047294426
DESCRIPTION:
BRIEF SUMMARY
The present invention relates generally to an improved apparatus making it possible to effect accurately, in line and continuously, the weight feeding or continuous mixing of a plurality of granulated or pulverulent products, such as: potassium chloride, sand, cement, phosphate, granules, and the like, this feeding generally being effected at the beginning of a production process, for example in the fertilizer industry, the cement and concrete industry, the agricultural foodstuffs industry, and so on.
Apparatus already known make it possible to extract the product to be weighed from a hopper by means of a variable delivery extraction apparatus, to drop this extracted product on to the endless belt of a dispenser, which is suspended and continuously weighed as a whole, to drive said dispenser belt at a determined speed corresponding to a given programmed delivery of the dispenser, and controlling the speed of the extractor belt to the measurement of the instantaneous load of product distributed on the dispenser belt.
In the apparatus known at present time use is made either of dispensers effecting separate extraction or of single or double weighing rollers and integrating weighing machines.
Study of metrological criteria has led the Applicants to discard single-belt dispensers, which have serious disadvantages inasmuch as: tension and quality of the belt, as well as by the hopper load, emptying of the hopper,
Separate-extraction dispensers known at the present time consist of an endless belt receiving the product from an extractor disposed under a hopper, the entire belt arrangement being pivoted about a fixed axis and suspended at its other end on a weight transducer, a counterweight optionally being disposed opposite said transducer in order to balance the dispenser under noload conditions. In other apparatus the endless belt of the dispenser is suspended at one arm of a balance, the other arm bearing weights.
Whatever their mode of operation, these dispensers have disadvantages, such as lack of sensitivity around the fixed axis, the fact that their performance is modified by the quality and homogeneity of the belt.
The present invention concerns an apparatus making it possible to effect accurately in line and continuously the weight feeding of granulated or pulverulent products comprising two separated endless belts for extraction and dispensing in which the endless belt of the dispenser is continuously weighed as a whole and in which the speed of the extraction apparatus is controlled to the measurement of the instantaneous load of product distributed on the dispenser belt characterized in that it comprises: endless belt for extraction, of which one of the drums is driven at variable speed by a motor-reduction gear. belt, this unit being constituted of a fixed T shaped support frame which at its ends is provided with three pilars supporting three strain gauge type flexion weight indicators which are provided with flexible suspension cables to which an ultralight tubular frame is attached an endless belt of which drums are supported by said ultralight tubular frame, one of the drums being driven at variable speed by a motor-reduction gear unit: the endless belt of the dispenser and the motor-reduction gear unit of the endless belt of the extractor, said chain being such that the speed of the extraction apparatus is controlled in dependance to the measurement of the instantaneous load of product distributed on the dispenser belt.
The apparatus of the present application provides substantial advantages including the following: +0.2% of the delivery displayed, 100% of rated delivery for one and the same dispenser,
Other characteristics, advantages and features of the present invention will be clear from the description of the latter which is given below with reference to the accompanying drawings showing, diagrammatically and simply, one possible embodiment of the invention which is given as a preferred exmaple.
In these drawings,
FIG. 1 is a diagram showing in elevation a continuous metering arrangement ap
REFERENCES:
patent: 2637434 (1953-05-01), Harper
patent: 2662665 (1953-12-01), Harper
patent: 3139217 (1964-06-01), Mell
patent: 3162325 (1964-12-01), Hall et al.
patent: 3897868 (1975-08-01), Smith, Jr.
Miller Jr. George H.
Societe Chimique Des Charbonnages S.A.
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