US1223612A - Separator for grinding-mills. - Google Patents

Description

W. J. PRICE.

SEPARATOR FOR GRINDING MILLS. APPLICATION FILED MAYH, 191s.

Patented Apr. 24, 1917.

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WILLIAM 3'. PRICE, OF DIXON, ILLINOIS.

S EPARATOR FOR GRINDING-MILLS.

Specification of Letters Patent.

Patented Apr. 24, 1917.

Application filed May 11, 1916. Serial No. 96,887.

To all whom it may concern:

Be it known that 1, WILLIAM J. PRICE, a subject of the King of Great Britain, re siding at Dixon, in the county of Lee and State of Illinois, have invented certain new and useful Improvements in Separators for Grinding-Mills; andl do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention is a pneumatic'separator for use in connection with grinding mills of the ring roll type or analogous mills, the object thereof being to provide an improved separator whereby the fine and coarse particles in the product discharged from the grinding mill are separated in a dustless and expeditious manner.

With this general object in view, the invention resides in certain novel features of construction and in unique combinations of parts to be hereinafter fully described and claimed, the descriptive matter being supplemented by the accompanying drawings which constitute a part of this application and in which:

Figure 1 is a side elevation of the invention showing its application;

Fig. 2 is an enlarged Vertical section; and

Fig. 3 is a horizontal section taken on the plane indicated by the line 3-3 of Fig. 2.

In specifically describing the construction shown in the drawings above briefly described, similar characters will be placed on corresponding parts throughout the several views and reference will be herein made to the numerous elements by their respective indices. To this end, the numeral 1 designates the improved separator into which the discharge chute 2 of a grinding mill 3 delivers, said separator having at its lower end a coarse material outlet 4: from which a suitable conveyer (not shown) usually returns to the inlet of the mill 3. The upper end of the device'l is equipped with a fine material discharge pipe 5 which enters the eye of a fan casing 6, the fan in said casing delivering centrifugally into the usual whirling type of dust collector 7 which collector discharges the fine material deposited therein through an outlet 8 at its lower end. From this outlet the material may be conveyed in any suitable manner. Leading from the upper end of the collector 7 and extending a suitable dismotion of the air as it leaves the collector 7 and enters the pipe 9, the inlet end of this pipe is preferably provided with a vertical baffle plate 10, and in order that excessive pressure may be relieved from pipe 9, a valved vent 11 is provided.

The foregoing will give a general understanding of the manner in which the inven tion is applied while the following description and explanatory matter will make clear the numerous novel features of construction and the uses and advantages thereof.

The casing of the separator 1 is formed of upper and lower cylindrical sections 12 and 13 having open inner ends spaced apart by sleeves or the like 1 1 interposed between angle iron reinforcing bands 15 which are riveted or otherwise secured to said inner ends, bolts 16 being passed through the hori- Zontal flanges of said bands and through the sleeves 14L as shown clearly in Fig. 2. The upper end of the section 12 is provided with a frusto-cone-shaped top 17 into whose upper end the pipe 5 projects a suitable distance, the bottom 18 of the section 18 being preferably in somewhat the form of the top 17 but being inverted to allow the coarse material therefrom to be readily directed to the outlet 4.

Mounted within the lower section 13 of the casing is means for retarding the clownward movement of the product discharged from the mill 3, said'means being preferably though not necessarily in the form of a cone 19 onto whose apex the chute 2 delivers, the base of said cone being spaced from the side wall of said casing 13 and being held in place by appropriate brackets 20. It will be noted by reference to Fig. 2 that the upper end of the cone 19 is disposed above the space between the inner ends of the sections 12 and 18,.this being essential since said space constitutes an inlet for directing a horizontal film of air under pressure against said cone for the purpose of blowing the finer particles of material thereon upwardly toward the fine material outlet 5.

The film of air above referred to is supplied from the pipe 9, which pipe delivers into an annular conduit 21, the latter surrounding and being secured to the adjacent ends of the upper and low er casing sections 12 and 18. For varying the strength or" the current of air which forms the film, a metal sleeve 22 is mounted slidably within the upper casing section 12, said sleeve engaging the wall of said section and being adapted to depend various amounts below said wall. The sleeve 22 may be adjusted by raising and lowering operating arms 28 which rise therefrom through openings in the top 1'7,

said arms being shown in the present embodiment of the invention as held normally against movement by spring catches 2 1. It will be understood, however, that any suitable means may be used for holding the sleeve 22 in its numerous adjusted positions.

A funnelshaped deflector plate 25 is shown beneath the lower end of the fine material discharge pipe 5, said deflector plate being movable toward and away from said pipe through the instrumentality of arms 26 similar to the arms 23 and equipped with suitable fastenin means 27. The plate 25 is of greater diameter than the pipe 5 and thus serves to retard the passage of fine particles of grain or the like into said pipe. Thus, it decreases the strength of the upward currents 01 air at this point with the result that any comparatively heavy particles of material which may have been carried upwardly by said air currents will fall into said plate 25, the latter having a discharge opening 28 in its lower end by means of which said heavy particles may descend onto the apex of the cone 19 to again be acted on by the film of air.

In operation, the fan within the casing 6 is set in motion with the result that upward currents of air will be drawn from the separator, while a film of air of predetermined power will be forced into said separator through the space between the upper and lower casing sections 12 and 13. As the mill 3 is now operated it discharges the product to be separated onto the apex of the cone 19 and this material starts to fall toward the bottom of the separator. In so doing, however, it encounters the film of air with the result that the coarser particles will fall from this film while the finer material will be blown toward the upper end of the device, at which point it will be caught by the upward currents of air set up by the fan in the casing 6. Thus it will be drawn into said casing anddelivered therefrom into the dust collector 7 from which it will be discharged through the outlet 8. During this separating operation, any comparatively heavy particles of grain or the like which may have been directed to the upper end of the casing will be caught in the deflect r 25 and returned'to the cone 19.

When operating on difierent grades of material or when it is desired to separate the j product into difierent grades of fineness, the

necessary results may be obtained by proper adjustment of the sleeve 22 and deflector plate 25, which devices control the Velocity of the air currents as will be readily understood. Furt-hermore, the fan in the casing 6 may be rotated at dilferent speeds as occasion may demand.

From the foregoing, taken in connection with the accompanying drawings, the construction, manner of operation and advantages of the improved machine will be readily understood without requiring a more extended explanation. In conclusion, however, I will state that although oertainspecific details have been shown and described for accomplishing probably the best results, numerous changes may be made-within the scope of the invention as claimed without sacrificing the main advantages thereof.

I claim:

1. In a separator for grinding mills, the combination of a separating chamber having in its lower end a coarse material outlet and in its upper end a fine material outlet through which suction is to be created,

means for depositing ground material in the chamber, means for retarding the downward travel of such material in said chamber, means for directing a horizontal film of air against said retarding means, and means for preventing the discharge of coarse particles with the fine material and for returning them to the retarding means.

2. In a separator for grinding mills, the combination of a separating chamber having in its lower end a coarse material outlet and in its upper end a fine material outlet through which suction is to be-created, means for depositing groundmaterial in the chamber, means for retarding the downward travel of such material in said chamber, means for directing a current of air against said retarding means, and means for retarding the passage of material from the separating chamber into the fine material outlet,

and for collecting coarse particles-of suchmaterial and returning them to the first mentioned retarding means.

3. In a separator for grinding mills, the combination of a separating chamber having in its lower end a coarse material outlet and in its upper end a fine material outlet through which suction is to be created, means for depositing ground material in the chamber, means for retarding the downward travel of such material in said chamber, means for dlrecting a current of air onto said retarding means, and a funnel-shaped deflector plate disposed beneath the fine material outletand' having a central discharge opening, said deflector plate serving to collect comparatively heavy particles of material and to re turn them through said discharge openingto said retarding means.

4. In a separator for grinding mills, the

combination of a separating chamber having in its lower end a coarse material outlet and in its upper end a fine material outlet through which suction is to be created, means for depositing ground material in the chamber, means for retarding the downward passage of such material in said chamber, means for directing a current of air against said retarding means, a funnel-shaped deflector plate disposed beneath thefine material outlet, said plate having a central discharge opening through which heavier particles of material collected on said plate may be discharged, and means permitting vertical adjustment of said deflector plate.

A separator for use in connection with grinding mills, said separator comprising a casing having pneumatic separating means therein, the lower end of said casing having a coarse material outlet while a fine material discharge pipe extends from the upper end of said casing, a funnel shaped deflector plate disposed beneath and of greater diameter than said pipe, said plate having a central opening to discharge comparatively large particles of material collected therein,

and means permitting vertical adjustment of said deflector plate.

6. A separator for grinding mills com-- prising a separating chamber having in its lower end a coarse material outlet and in its upper end a fine material outlet, means for depositing ground material in the separating chamber, means for retarding the downward travel of said ground material, means for directing a film of air from the wall of the separating chamber against said retarding means, means for preventing the discharge of coarse material with the fine and for returning it to the retarding means, said preventing means being adjustable for different grades of material, and means for varying the size of the inlet of the air film according to the grade of material being separated.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

EMMA K. BARTHoLoMEW, GERTRUDE G. YOUNGMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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