US1246775A - Combined tube-mill and ball-mill. - Google Patents

Description

L L. MUSHETT.

COMBINED TUBE MILL. AND BALL MILL.

APPLICATION FILED AUG-24. I9l6. v

Patented Nov. 13, 1917.

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Wl 7W E SSE S LEO L. MUSHETT, OIF MANHATTAN, NEVADA,

COMBINED vTUBE-lVIIl'JIl'l AND BALL-MILL.

Specification of Letters Patent.

Patented Nov. 13, 1917.

Application led August 24, 1916. Serial No. 116,587.

To all 'whom t may concern:

Be itknown that I, Lno L. MUsI-In'r'r, a citizenof the United States, and a resident of Manhattan, in the county of Nye and State of Nevadiuliave invented a new and Improved Combined Tube-Mill and Ball- Y Mill, of which the following is a full, clear,

and exact description.

My invention relates to a grinding mill of the general form of the tube mill but divided transversely into compartments, the rst of which contains heavy balls by which the rock is broken up, the material being fed to the second compartment containing pebbles, or the like, for grinding the broken material.V

My invention has particularly in view an improved means for separating the compartments of the mill and for feedingthe material from the first compartment to the `second compartment to be ground.

The invention also has in view a mill of the indicated character in which the axial feed passage through the head can be utilized as a manhole and the provision of a partition and feed means associated therewith, so constructed and arranged that it may be taken apart and removed, or sections thereof renewed, the manhole feed passage serving for the entrance and removal of the parts constituting the partition and feed means.

The invention will be particularly explained in the specific description following.

Reference is to be had to the accompanying drawings forming a part of this specification in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a longitudinal section taken centrally of the mill;

Fig. 2 is an enlarged face view o f the partition and feed means, parts being broken away;

Fig. 3 is a section on the line 3-3, Fig. 2;

Fig. l is a rear viewof the partition and feed means, parts being broken away and others in section.V

In carrying out my invention in practice, an elongated tube 10 is constructed having the general character of tube mills and I divide the same by a transverse partition, designated generally by the numeral 11. The tube is provided with heads 12, 13, of

any approved detail construction and driven, 1n practice, in any suitable manner. The heads have trunnions formed with axial Ybores constituting respectively the inlet and outlet for the material, the heads in practice, turning in suitable supports, (not shown).

The partition 11 divides the tube4 1() into a crushing compartment 14 and agrinding compartment 15. The compartment 14 is equipped with a suitable number of large balls 16 which may take, generally, the form of a cannon ball or otherwise as practice may dictate. In the compartmentlis a quantity of pebbles 17 or equivalent reducing means as is customary in tube mills.

The object `of the arrangement as described is to cause the balls 16 to break up rocks fed thereto through the head 12 and to then transfer the broken material through the partition 11 to the compartment 15.

The trunnion of the head 12 is fitted with a spiral feed tube 18 or other feed means to conduct material to the trunnion. The bore of the trunnionis of such a size that it may be utilized as a manhole for the entrance of a workman and for the entrance andremoval of the elements making up the partition 11 and its appurtenances.

.The partition 11 includes radial spokes, here shown as four in number, two being designated by the numeral 19, a third by the numeral 19a, and a fourth by the numeral 19h. The inner ends of the spokes constitute hub` sections and are formed with radial flanges 20, the adjacent flanges of the respective sections being suitably bolted .together. The front of the partition is in the form of a screen to permit the material broken up in the chamber 1li to pass into the partition. rlhe front is made up of sections suiiiciently small to be passed through the head 12 for which purpose a central disk 21 may be utilized, about which is placed segmental plates 22 perforated to constitute a screen. The Vrear of the partition 11 may, similarly, be formed of a central flat ring 23 and sectors 24.

The front and back of the partition 11 are spaced by the spokes so that the partition'is hollow to receive the material passing through the screen plate sectors 22. Within the partition a spiral feed device is formed to take up the material at the periphery of the partition and discharge it to the hollow center of the partition and to the compartment 15. The spiral feed device is made up of spiral pipe sections between the respective spokes, the spokes having openings constituting part of the spiral passage. Three of the spokes have transverse openings 19` having spiral relation. The spiral pipe sections 25, 25EL are secured between adjacent spokes to communicate with the said openings 19C. A third spiral pipe section 25b receives at one end the material from the adjacent opening 19C and communicates with an opening 19d in the next spoke 19a, said opening 19d being directed inwardly and communicating with the hollow center 26 formed by the hub sections of the respective spokes. The inlet to the hollow center 26 may be partially formed by a recess 19e in the adjacent spoke 19b so that the two spokes 19a, 19h, form jointly the inner terminal of the spiral feed passage.

The disk 2l and the ring 23 may be made 1n sections to insure their ready entrance and removal through the head l2 without forming the bore thereof unduly large. Any suitable means may be formed to unite the different elements; the spiral pipe sections 25, etc., are shown as having flanges 27 for'receiving screws 28 or the like taking into the spokes 19, etc. Screws 29 are shown in the present example for securing the elements 21, 22, 23 and 211C to the spokes. The numeral 30 indicates the central opening in the ring 23 for the discharge of the material from the hollow center 26 to the compartment 15.

By the described arrangement effective ready delivery of the crushed material fromthe compartment 14 to the'compartment 15 is obtained, the construction insuring that only such material enters the compartment 15 as may be eifectively taken care of by the grinding means therein.

The described construction affords practical means for carrying my invention into effect and I will state in conclusion that 1 do not limit myself strictly to the mechanical details herein illustrated, since manifestly the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

In the operation of the apparatus constructed as above described, different levels of the material are maintained in the two compartments, the respective levels making for effectiveness in the ball compartment and in the pebble compartment, the material in each compartment being maintained at a level suitable for the crushing and reducc ing elements to which the material is subjected in the respective mills. l I Having thus described my invention 1 claim as new, and desire to ters Patent:

l. A mill of the class described including a tube having an inlet at one end and an outlet at the opposite end, a transverse partition in said tube dividing the same into compartments, crushing elements in the first compartment to break up the rock, reducing elements in the second compartment to grind the crushed material, and a spiral feed device in the partition, said partition having sectional front and back plates, and spokes between said plates and formed with detachably connected hubsections, the said feed device comprising spiral pipe sections detachably connected with the spokes, and said spokes having openings complementary to the spiral pipe sections, the partition having a hollow center receiving the material from the feed device and having a lateral outlet therefrom to the second compartment.

2. A mill of the class described including a tube having an inlet at one end and an outlet at the opposite end, a transverse partition insaid tube dividing the same into compartments, crushing elements in the first compartment to break up the rock, reducing elements in the second compartment to grind the crushed material, and a spiral feed device in the partition, said partition having a front formed of .a central imperforate plate and a screen radially outward from the imperforate plate and formed in sectors, the rear face of the partition being formed in sections and presenting an open center leading to the second compartment, there being secure by Letseparate radial spokes disposed between the plates, the spokes having hub sections de-Y tachably united and forming a hollow center in the partition and communicating `with the open center of the rear plate, said feed device yincluding spiral pipe sections between the spokes and said spokes having openings complementary to the pipe sections, said feed device furthermore having an inlet adjacent to the periphery of the partition and discharging at its inner end to the said hollow center of the partition.

3. A mill of the class described including a tube having an inlet at one end and an outlet at the opposite end, a transverse partition in said tube dividing the same into compartments, crushing elements in the first v to receive at one end material to be reduced openings complementary to the pipe secand means at theropposite end of the chamtions and forming therewith a spiral feed ber to eiect discharge of the material by device adapted to receive the reduced ma- 10 the rotation of the mill, the said means comterial from the said chamber t0 discharge 5 prising spokes in the said opposite end, and the same.

spiral pipe sections disposed between the spokes, the said spokes having transverse LEO L. MUSHETT.

Copies of this patent may be obtained for ve cents eachLby addressing the Commissioner of Eatents. Washington, D. C.

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