US1635453A - Centrifugal impact pulverizer - Google Patents

Description

July 12, 1927.

F. E. AGNEW CENTRIFUGAL IMPACT PULVERIZER Filed Dec. 9. 1925 2 Sheets-Sheet 1 i a July 1927' F. E. AGNEW 635 453 CENTRIFUGAL IMPACT PULVERIZER Filed Dec. 9.1925 2 Sheets-Sheet z Patented July 12, 1927.

UNITED STATES PATENT OFFICE.

FRANCIS E. AGNEW, OF HUNTINGTON PARK, CALIFORNIA, ASSIGNOR TO MINERVA A.

BROTHERTON, OF SANTA BARBARA, CALIFORNIA.

CENTRIFUGAL IMPACT PULVERIZER.

My invention relates to centrifugal impact pulverizers and consists of the novel features herein shown, described and claimed. An object of in invention is to make a 5 centrifugal pulverizer having a plurality of impellers upon a single vertical shaft, so

that the material will pass downwardly from one impeller to another.

Another object of my invention is to make 1 a centrifugal pulverizer having a vertical impeller shaft extendingthrough the pulverizing chamber and to provide an improved end thrust' bearing and dust excluder for the bearing.

Other objects and advantages will appear from the drawings and specification.

The drawings illustrate the invention.

Figure l is a vertical diametrical sectional detail of a centrifugal impact pulverizerembodying the principles of my invention, the View being taken on the line l-l of Fig. 2 and looking in the direction indicated by the arrow. A Fig. 2 is a horizontal cross section on the L line 2- -2 of Fig. 1. V

Fig. 3 is an enlarged vertical diametrical sectional detail on the line 3-3 of Fig. 1.

The details of the centrifugal impactpulverizer are as follows:

A discharge hopper 1 is circular in plan at its upper end and has a peripheral flange 2 extendingall the way around. The base 3 is an annular flange fitting upon the flange 2 and the two flanges are connected by cap screws 4. Supporting plates 5 and 6 extend from the flange 3 at diametrically 0pposite sides and have supporting ribs 7 and 8. The plates 5 and 6 are adapted to rest upon a suitable foundation for supporting the pulverizer and have bolt holes 9 and 10 for attaching the plates to the foundation.

The bearing block 11 is formed as an integral part of the discharge hopper 1. The

. wall 12 extending downwardly from the flange 2 is funnel shaped, the funnel being mutilated to produce a discharge opening 13 at one side of the bearing block 11 and forms a collecting chamber 14. The extension bearing block 15 extends upwardly from the bearing block 11 into the chamber 14. A circular bore 16 is formed from the lower face of the bearing block 11 and an oil port 17 leads from the outer face of the bearing block 11 into the upper end of the bore 16,

the outer end of the port 17 being closed by a removable plug 18.

The thrust bearing assembly 19 is inserted upwardly into the bore 16 and has a flange 20 fitting against the end of the block 11 and is held in place by cap screws 21. A bore 22 is formed from the upper end of the extension block 15 down to a shoulder 23 and a smaller bore 24 leads from the shoulder 23 to the bore 16. An inner tube 25 is fixed in the bore 24 and extends to the top of the bearing block 15. The impeller shaft 26 extends downwardly loosely through the tube 24 and the thrust bearing member 27 is fixed upon the lower end of the shaft 26 before the assembly 19 is mounted in the bore 16.

The upper end of the block 15 is finished to make an offset shoulder 28. The set collar 29 has a bore 30 to receive the shaft 26 and an enlarged bore 31 to receive the tube 32. The collar is rigidly mounted upon the shaft 26 by set screws 33 or the like and the tube 32 extends loosely in the bore 22 and loosely around the tube 25 to near the shoulder 23. The lower face of the set collar 29 is counterbored to make an end ring 34 cooperating with the offset shoulder 28 to make a staggered joint between the collar 29 and the bearing block 15 and this staggered joint with the tubes 32 and 25 operating in oil or grease serves to exclude the pulverizeddust of the chamber 14 from the thrust bearing 19.

The casing 35 is formed integral with the base 3 and extends upwardly and has an annular flange 36 around its upper end. The casing 35 and base 3 mounted upon the flange 2 leaves an annular shoulder 37 at the top of the hopper 1. The casing 35 is circular in plan and forms a circular chamber 38. The cylindrical breaker or impact plate 39 fits in the lower end of the casing 35 upon the shoulder 37 and has a corrugated inner face 40. The plate 39 is preferably made of manganese steel. The intermediate portion 41 of the shaft 26 is hexagonal in cross section.

The impeller disc 42 has a hub 43 with a bushing 44 cast into the hub and fitting the hexagonal portion 41 of the shaft. culai' web 45 extends outward from the lower end of the hub 43 and straight inipeller blades 46 extend in a radial direction The cirplate 39. The spacing sleeve 48 fits upon:

the hexagonal portion of the shaft 26 against the hub 43. Thesecond' impeller 49 fits upon the shaft 26 against the'sleeve 4-8. Thai-alpaca plate50'fit's in tlie' shell 85 upon the funnel 47, v in the shell 35 against the impact plate" 50. The second sleeve 52 fits upon the shaft 26 against the impeller 49. The third impactplate' 53" fits i'n the shell 35 against the tunnel' 51 The thir'cliimpeller 54: comprising a disc having impeller blades fits upon the shaft 26 against the sleeve 5:2 The third funnel 55" fits in the' shell 35 against the- Sc-rew threads 56 are impact plate' v formed upon theshaft 26 above the impeller 56F and jam b nuts" 57 and 58" fit upon the threads 56 against the' l-iub of the impeller 5 L to"tightenfthe impellers against the said collar 29.- K-plttte 59 fitsin the shell'35 against the top of the tunnel 55 and has a central openiiig through; which the" shaft 26 e'ziten ds and lias a second opening through which the feed spout GO eXtends. The cap ring 6i tits upon the annula'r' flange, 36 and Sllglifly v laps the edge of the plate 59 and is held inplace by cap screws 62'. The poftion' 63 of the shaft 26* aho've the threads 56is' round and smooth and a" belt pulley er is secured upon this portion of the shaft above the cap ring 61; z I

A f-ins 65 extendupwardly and inwardly from the ring (Bland-a bearingblock 66 is rahhea integral with the upper ends" of the arms 65. The feed spout (SO-has a'- fun nel shapeduppr end 66' and is inserted thIoug-h one of the arms 65 and through the plate 59 to discharge the material tothe funnel 5 5 aha to theupperiinpell'e'r '54,

that being a flange 67" eX-tehai g fromthe the spout Securely in place.- The chamber" 68" is foiiild from the upper end of the bearing "hlhli 66 and the hall hearing as senibly 69- is' mounted in this chamber arouhd and-'upoii" the upper end of the shaft 26" and a cap 7 0' is secured to the bearing block by capscrews 71th cover" the bearing 69; The driving belt 72 passes around the pulley 6 lgone flight-ofthe" belt being on oiie side of the arm 65 arid-the other'fiight" on the other side.

The centrifugal impact pulvriz' r thus constructed is adapted to pulverize lime"- stone; talc, quartz; ores; and the'lik'e, to produceva-rious mineral )roducts, and'the' ma tcrial to 'be pulvehizetl is broken intocord paratively small pieces and continuously fed The second funnel 51- fits through the spout 60 and funnel 5 to the impeller 54'f-r0m which it is discharged against of the impeller 49 and is again thrown against the impact I plate 50 arid passes downwardly through the funnel l7 to the central portionofthe impeller 42 and is again thrown against the impact plate 39 and passes downwardly to the chamber 14: and is discharged through the passage 13. or course the impellers are to be operated at a high rate of speed and the successive impeller actions will reduce suitable ore of other material to a fine' powder and if all of the material is not s'ufli'ci-ently reduced it may be separated and run through the machine" again:

Thus I have made a centrifugal impactpulver'izer,- comprising a discharge hopper ha-ving a central bearing block and adischarge opening at one sideof the barnigl block, an impel-le'rshaft mounted' i-n a thrust bearing 1n the bearing block, means for ex eluding dust from the thrust bearing-a shell mountedupon the hopper,- an impact plate mounted in the shell, an impeller mounted upon the s'ha' tt to discharge against the imact plate; dfu'nnel' mounted in the shell upon the impact pla'te' and forminga pul-' verizingunit,therebeing a plurality of said pulverizingunits in the shell and upon the shaft above tlie'firstunit, and a discharge spout leading to the top unit,-- so; that the material will pas's'irom one" impeller unit to the next and then to the discharge hopper-.-

Var'iou's' changes may bema'de witho ut d epartin claimedi- I claim:

1.- A centrifugal inlpa'ct" pulveri'zer (ionia discharge hopper having weer-112ml bearing block andadi-scha-rg e opening at one side 01 the bear-ih' block, a vertical impeller shaft mounted in thrust- Bearih in the bearing block, a vertical ,shellinounted upon the hopper, a cylin'clriealimpact plate mounted in" the shell; an impeller having' a hon zont'a'l discwith radial; I vertical blades at its outer" edge spaced from the shaft mounted upon" the shaft to discharge against the inrpact' plate, a funnel; rnotinted in the shell upon the i in-pact plate discharging" near the center of the; disc, said impact-plate, impellerand funnelforming a" puiverizihg uhia therebeing a plurality of saitlpulv'eriz' ing' unitsflin tll sheik above the lOWeSIi' uiiit, and a dis charge spout-"leading to the top unit's'oth'at material will pass from one impeller unit to the next and thento the discharge happen 2-111 a-centrifugal" impact pulverize'r', at vertical she'll; a veitical' impeller shaft in the shell; ah im eller u'pon'flthe" shaft having hori'z'ontal d'isc withbladhs adjacent its'outer edge, an impact plate in the shell iii thefrom the spirit of my invention as g plane of the impeller, a funnel in the shell discharging to the impeller substantially inside the blades, a second similar impeller upon the shaft upon the funnel, a second similar impact plate in the shell in the plane of the second impeller, and means for discharging material to the central portion of the second impeller.

3. A centrifugal impact pulverizer comprising in combination a vertical shell hav ing a series of cylindrical breaker rings therein, a vertical shaft having a series of fiat horizontal impeller discs mounted thereon, vertical impeller blades mounted on some of the discs adjacent their outer edges, and a series of funnel-like constructions to feed material from the outer periphery of an upper impeller disc to the central portion of an impeller disc there next below.

4. A centrifugal impact pulverizer comprising in combination a vertical shell having a series of stationary cylindrical breaker rings therein, a vertical shaft having a series of horizontal impellerdiscs mounted thereon, impeller blades mounted on some of the discs and a series of hopper-like constructions adapted to feed material from the outer periphery of an upper impeller disc to the central portion of an impeller disc there next below.

5. A centrifugal impact pulverizer comprising in combination a vertical shell havon the shaft, impeller blades ext-ending upwardlyfrom the surfaces of the discs adjacent the periphery of the discs and spaced from the center, said blades being adapted to throw material radially outwardly against the breaker rings, a hopper at the top of the shell, and a series of secondary hoppers inclined inwardly from the breaker rings towards the center of the impeller discs, adapted to discharge material on said discs inside the impeller blades.

6. In a centrifugal impact pulverizer, a vertical shell having a breaker ring, a ver tical shaft, an impeller disc mounted thereon, a plurality of impeller blades extending vertically and radially outwardly of said disc adjacent its periphery and spaced from its center, a hopper-like structure positioned above the disc, havinoa discharge above the disc adjacent the shaft and radially inwardly of the impeller blades.

7. In a centrifugal impact pulverizer, a vertical shell, a stationary cylindrical breaker ring mounted therein, a central vertical shaft with a horizontal impeller disc thereon, a plurality of impeller blades, such blades extending upwardly from the disc adjacent its periphery, and being positioned in a radial direction, the inner edge of the blades being spaced from the shaft, and a hopper positioned above the disc, having a discharge on to the disc radially inwardly of the inner edges of the impeller blades.

In testimony whereof I have signed my name to this specification.

FRANCIS E. AGNEW.

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