US1413935A - Automatic feed control - Google Patents

Description

E. R. RAMSEY AND A. L. BLOMFIELD.

AUTOMATIC FEED CONTROL.

APPLICATION FILED APR,5,1919.

Patented Apr. 25, 1922.

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Patented M1525, 1922.

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R. RAMSEY AND A. LfBLOMFIELD.

AUTOMATIC FEED CONTROL.

APPLICATION FILED APR. 5, 1919.

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A TTORNF ELMER R. RAMSEY, OF DENVER, AND ALFRED L. BLOMFIELD, OF COLORADO SPRINGS,

COLORADO, ASSIGNOBS TO THE RATIOIhT OF DELAWARE.

AUTOMATIC} rnnn common.

' I Applicationffil'ed April 5, To all whom it may concern:

Be it known that we, ELMER R. RAMSEY and ALFRED L. BLoMFInLn, citizens of the United States, residing, respectively, at Denver, in the county of Denver and State of" tem of cooperative devices: w ich operates to regulate the feed to a classifier by and proportionate to variations inthe weight of all or part of the'material under treatment. 7

Variations in the weight of a load of a separating apparatus-of! the type to which.

' the inventionis applicable, are directly proportionate to increases or decreases in the quantity of the coarser part or oversize of the material which in wet classification settles out of the liquid and suspended slimes, and itiis specifically by variations" in the weight of the'coarse or oversize product of the classifier that the feed is regulated inthe operation of our; invention.

Another object of the invention is to utilize variations in the weight of an oversize product of\ ,the classifier for maintaining the load uniformly at a predetermined density by automatically increasing or decreasing a water supply in ratio to density variations.-

The weight of the coarse product of the separating action is effective for the purpose of regulating the feed, while it is a part of the load of the classifier or after it is discharged therefrom, and we desire it understood that either method may be utilized within the principle of our inventions A system of devices applicable for use under each of the above-named conditions has been shown in the accompanying: drawin's in which gure 1, the system as emplo ed "when the feeding action andliquidsupp yare controlled by the material in theclassifier, and

. Figure 2, the system as arranged when variationsin't-he weight of the oversize after Hfifilii 11fiib thef classifier. 1s ut Specification of Letters Patent. PatentedJApr. 25, 1922.

1919. Serial No. 287,906.

- lized to regulate the feed of fresh material and the supply of additional liquid to the materiali under treatment.-

FigureB represents a section of the valve which controls the water supply, in its normal, partially open position.

Referring to the drawings, the referencenumeral 2 designates a classifier of suitable construction which receives its load from an endless belt 3 through the medium of a,

chute 4 and which discharges the oversize of the classified material through a chute 5.

The endless feedbelt is mounted on rollers 6 and 7 and receives its'load froma superposed bin 8, and the roller 7 is connected by a belt 18 with the rotary element of an electric motor 19 which receives its current the velocity of the motor will be proportion- '1- ately reduced or increased.

In the operation of the above-described system the feed belt conveys thematerial discharged from! the supply bin 8, contin- DORE COMPANY, OF NEW YORK, N. Y., A'CORPO- uously to the chute 4 which delivers it into the classifier and the valve 16, which preferably is of the butterfly type, 1s m a par- 'tially' open position as shown in Figure 4 to continuously supplya certain quantity of 'water to the materials under treatment.

When the load onthe feed belt increases in weight so as to overbalance the resistance to the movement of the. lever-12, consequentincrease of density of ,the load in the classifier is obviated by an immediate increase of the liquid flowing; to the classifier through the conduit 17, by further open1ng the valve through the medium of the connecting rod 175. a f

The movement of the lever at'the same .time increases the resistance to the current flow through the -circu1t,-j1nl the rheostat,

whereby the movement of the feed-belt is mal. p I

It will be see that by these means,overretarded until the conditions are again nor avoided and that in'case the supply of material to the feed belt is diminished so as valve.

to .underload the classifier, the feeding action of the belt is automatically accelerated means of a link'2'6-connected with the/short arm'of a second lever 12.

. A spring 14 acting upon the lon arm of the lever 12'compensates for the weight of the parts connected to'its opposite arm and the link 15 connects the long arm of the lever with the crank arm 16 of a valve .16 which controls the flow of a liquid through a conduit17. leading from a sourcesupply and emptying-into1the classifier. A rheostat 23 introducin a variable re sistance in the circuit of the motor is controlled by a contact on the'long arm of the lever so that any movement of the lever about its fulcrum will'change the velocity ofthe motor and in consequence that of, thev feed belt 3.

In the operation of the above-described system the feed belt conveys the material discharged from the supply bi'n' 8, continuously-to the chute 4 which delivers it into the classifier and the valve 16 which pIef-' erably is ofthe butterfly type, is in a par-' tially open position as sh ow'n, in Figure 3 to" continuously supply a certain quantity I of water to the material under treatment.

When the load I in the classifier increases inweight so as to overbalance the resistance i loadiigg to the movement of the lever 12, consequent increase of densityof the load is obviated by an immediate increase of the liquid flow-. ing to the classifier through the conduit 17 by further opening the "valve through the medium of the connecting-rod 15.

r The vmovement of the lever at the same time increases the resistance to' the current.

flow through the circuit, in the rheostat, whereby the movement of the feed-belt is reti rded until. the conditions. are again norma It will be seen that by these vmeans, overof the classifier is automatically avoid and that in case the supplyof material to the feed belt is diminished so as to' underload'the classifienthe feeding actionof the belt is automatically accelerated by a movement 'of'the lever in'the opposite di-t rection and-a consequent decrease in the resistance to. the. current flowthrough the oversize product of the classifier. J

circuit in the rheostat, while at the same time the water supplied to theclassifieris' diminished by a closing movement of the valve. v v In the construction illustrated in Figure 2, the feeding action of the belt is controlled by variations in the weight of the oversized product of classification after this discharge from-the classifier in a determinate period of operation.

fier'is through the-chute 5 delivered onto an endless belt 27 which is mounted on rollers 28 and 29. One of the-rollers is supported in stationary bearings'3O and the other is a link 32 from the short arm of the lever 12.

When the..weight of the oversize dis charge from the classifier in a determinate period of operation varies from-a predetermined uniform quantity, the consequent pivotal movement of the belt 27 will cause an increase. or decrease of the resistance tothe current flowin the-rheostat and a consequent retardation or acceleration of the movement of the feed belt, while the supply of water to thematerial under ,treatment through theconduit 17 is proportionately reduced or augmented to regulate the density vof the loa in the classifier and thereby assist in maintaining its operation at the maximum of efliciency.

It will thus-be seen that by the use of our invention variations in the weight of the material under treatment in the classifier directly proportionatexto the weight of its mounted in boxes 31 which are suspended bycoarser product either beforeor after it is discharged therefrom, are utilized to automatically regulate the .feed for the con- .stant operatlon ofthe .niaohine to its full.

We desire, it, understood that the system of devices shown in the drawings i's-merely illustrative as oneof many methods that maybe employed to produce the desired. results, and that our invention is applicable to any classifying machine irrespective 'of' its size or construction.

h Having thus described our invention what we claim and desire to secure {by Letters-Patent is:

' 1. In combination, a classifier, anappliance forlfeeding. material thereto, means for receiving the oversize product, and means for regulating the feeding'actionof said appliance by .variatiomis'in the. weight of an -2. In; combination, a classifier, an applianoexgfor feeding material thereto,'means for receiving the, oversize product, a valve-controlled liquid-supply, and mechanim for, I

regulating the feedingaction of'said applt.

m ce by variati in the weight of an over- 75 The .oversize discharge from the classiadjustment of its valve.

size product of the classifier, including means to simultaneously regulate the liquid-supply 3. In an apparatus for'thetreatment of granular material, a circuit, a feeding appliance, an electric motor for the feeding appliance, connected in the circuit, a rheostat in the circuit, and Weighing means including a movable member for operating the rheostat by variations in the Weight of material under treatment to correspondingly regulate the feeding action of the appliance.

4:. In an apparatus for the treatment of granular, material, a? classifier, means for feeding material to said classifier, means for receiving the oversize from the classifier, a Weigher for said oversize material and means for operating said feeding means including means for regulating the said supplyactuated by the operation of said weigher.

5. In an apparatus for the treatment of granular material, a classifier, weighing mechanism adapted to receive oversize from said classifier and having a lever'supported element, a feeding appliance, a valve controlled liquid supply, and mechanism'actuated through the medium of the lever by variations of material toregulate the feed- I ing action of said' appliance and to simultaneously regulate the liquid supply by the adjustment of itsvalve.

6. In a classifying apparatus, a classifier, Weighing mechanism adapted toreceive oversize from said classifier and having an element movable by variations in the weight of an oversize in material under treatment,

a feeding appliance, and means actuated by movement of said element to correspondingly regulate the feeding action of said appliance.

- 7. In a classifying apparatus, a classifier, weighing mechanism adapted to receive element movable by variations in the weight of an oversize in the material under treatment, a feeding appliance, a valve controlled liquid supply, and means actuated by movement of said element to regulate the feeding action of said appliance and other means also actuated by the said element for simultaneously regulating the liquid supply by adjustment of its valve.

8. In classifying apparatus, a classifier,

Weighing mechanism having means connected therewith for receiving oversize ma-' stat in the circuit, a valve controlled liquid supply, and weighing means including a movable member operated by variations in the weight of material under treatment, and means connected with the said member and with the rheostat and the valve of the liquid supply for controlling the current and the supply of liquid.

In testimony whereof We have afiixed our signatures.

' ELMER R. RAMSEY.

ALFRED L. BLOMFIELD.

. oversize from said classifier and having an

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