US2893649A

US2893649A - Grinding mill

Info

Publication number: US2893649A
Application number: US715646A
Authority: US
Inventors: Myron S Mischanski
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-02-17
Filing date: 1958-02-17
Publication date: 1959-07-07
Anticipated expiration: 1976-07-07

Description

July 7, 1959 MQs. MlscHANsKl GRINDING MILL 3 Sheets-Sheet 1 Filed Feb. 17, 1958 www July 7, 1959 M. s. mlscHANsKl 2,893,649

GRINDING MILL 3 Sheets-Sheet 2 Filed Feb. 17, 1958 INVEN xM//////////V/V/V/ July 7, 1959 M. s. MISCHA'NSKI 2,893,649

GRINDING MILL Filed Feb. 17, 1958 3 Sheets-Sheet 3 United States Patent() vThis invention relates to aY grinding mill for grinding and pulverizing materials of various character. The 1nventiongparticularly `comprehenlsa. grinding mill for pulverizingmaterial tol avrelatively tine powder.

Another object ofthe invention 4is to provide a grinding mill having a grindingmember rotatably mounted a fixed grindingmembe'r and rotatably carried by the grinding memberare 'a plurality of conical shaped crushing cones arranged within the fixed grinding member and adapted for rotation in a direction reverse to that of thev grinding member. Y a.

Y Still .another object of the inventiongis to provide a grinding millof said character `in whichthe crushing cones have smooth peripheral facesrfor crushing material betweenthe Vsame and the' cooperating Vface of the fixed grinding member. a ,y V

.Still another object of the'inventionis to provide means for` varying the pressure oflthe conical shaped cones against the fixed member.' Y j l. y

' .Still another object of the invention is to provide a grinding mill of said character in which the rotatably mounted grinding member includes a conical shaped upper portion and a cylindrical shaped lower portion.

."Still another object of'thev invention is `,to provide a grinding mill which' is so constructed and arranged as to permit of the convenient removal orrepl'acement of the parts thereof. Y.

v`rvrith the foregoing andv other vobjects in view, reference isnow made to the followingspecication and accompanying drawings in whiclivthe preferred embodiments of the invention are illustrated. l

'Invthe'fdrawingrsz .1 Figi ,1 isa vertical sectional constructed in accordancewiththe invention. 'A Fig'. 2 ,isv 'a horizontal sectionaljview taken approximately on line v2 2- of Fig.. l.,

view ofia grindingrnill i Fig. 3'is a horizontal sectional `view taken approxil mately on line 3 3 of Fig." 1.

Fig. 4 is a fragmentary vertical sectional view of a grinding mill embodying la modifle'dfform ofthe ,invsntionr, Y L1. 1 y' 1 Fig. 5 isa schematic view of hydraulic means for varying the pressure of the crushingelem'ents.v `f v V Referringto the drawings, the-grinding mill illustrated in Figures 1 to` 3 Ainclusive of the drawings includes a cylindrical housing 10 supportedby and aiiixed to a support 11 of any desired character; Arranged within ,the housing 10 isa cylindrical casing12 which is secured bygscrews 13 or equivalent fastening 'means-to a top housing section 14 and with screws 15 or equivalent fastening means securing the housing section 14ste the housing 10...` y s s Arranged below the casing 12vr lisfan` annular member 16 to.which.thehousing` lfis'aiiixedby screws..17 .or

equivalent fasteningmeans screws v.18 oreouivalentfa'stening'rneans rigidly fastening theannular member] 16 to( 'the Support '1l-r. The .Casina 12:;CQnstuteS-.a

`Isupport for a yplurality of verticallyspaced'r'ows of teeth 2,893,649 Patented July 7, 1959 ice 2 19 arranged with a plurality of the teeth 19 in each row disposed in circumferentially spaced relation. The teeth 19 are secured in threaded openings 20 in the casing 12 with the inner ends of the teeth projecting radially therethrough.

With the housing 10 is a Vgrinding member 21 atiiiredv to a vertically disposed drive shaft 22 having a pulley 23 mounted thereon for turning the same by power means such as electric motor (not shown). The drive shaft 22 is journaled for rotation within a radial bearing 24 mounted in the top housing section 14 with the lower end of the drive shaft being enlarged and keyed or otherwise alflxed to a anged sleeve 25 forming the upper end of the grinding member 21. The grinding member 21 also includes a hollow frusto-conical shaped member 26 in which the flanged sleeve 25 is snugly iitted with the flange extending over the top thereof and secured thereto by screws 27 or equivalent fastening means. Secured to the frusto-conical shaped member 26 by screws 28 or equivalent fastening means isY a cylindrical mem-v ber 29 forming a part of the grinding member 21. The cylindrical member 29 is provided with a cylindrical bore 30 which opens into enlarged bore portions 31 and 32 opening through the top and bottom faces thereof in which are arranged a thrust bearing 33 and a radial bearing 34 respectively. Engaging against the upper race of the thrust bearing 33 is a head 35of a centrally disposed shaft 36 mounted for guided reciprocatory movement ina sleeve 37 aliixed at its lower end to a bottom section 38 of the housing 10. The upper end of the sleeve 37 is arranged within the inner race of the radial bearing 34.

The grinding member 21 is provided with a plurality of vertically spaced rows of teeth 40 arranged with the teeth in each row disposed in circumferentially spaced relation.' The teeth 40 `are formed on arcuate sectors 41, which sectors are secured to the conical shaped peripheral face of the member 26 by screws 42 or equivalent fastening means. The cylindrical member 29 is also provided with a plurality of vertically disposed rows of teeth 43 which are arranged with the teeth in each row disposed in circumferentially spaced relation. The teeth 43 are aixed to arcuate sectors 44 secured to the peripheral face of the cylindrical member 29 by screws 45 or equivalent fastening means. Each of the rows of teeth 40 and each of the rows of teeth 43 are disposed intermediate two of the rows of teeth 19 carried by the casing 12. This construction permits of the convenient removal of the

sectors

41 and 44 for the replacement thereof with new teeth.

A particular feature of the invention is the use of a plurality of conical shaped crushing elements 47 preferably consisting of three such elements disposed 120 apart and provided with vertically disposed shafts 48 each journaled for rotation in

radial bearings

49 and 50 arranged in a cylindrical cavity 51 in the cylindrical member 29 and with the upper end of the shaft bearing against a thrust bearing 52. The crushing elements 47 rotate with the rotation of the grinding member 21 and have independent rotation in an opposite direction by engagement of the conical shaped faces 54 thereof with the inclined peripheral face 55 of the annular member 16. Means is provided for varying the pressure of the crushing elements 47 against the peripheral face V55. For this purpose, the shaft 36 protrudes through the bottom secv tion 38 of the housing 10 and is threadedly engaged by desiredcomminution, a lock nut 57 is tightened von the shaft 36 against the nut 56 for maintaining the same in set position. The bottom section 38 of the housing is secured by screws 58 or equivalent fastening means to the lower end of a cylindrical wall 59 forming a receivingehgrnber 6.0 for the ground. materiel which. iS retrieved asf desired threiigh discharge openings 6l therein` The. eyliridrieal wall 59 is affixed te the cylindrical member 16 by screws, 62 er equivalent fastening ineens below the lower end of the peripheral face 55.

The top section 14 is provided with a plurality of epenings 64. ier feeding the material te be ground between the casing 12 and the grinding member 21. The material is progressively reduced in size as the same passes downwardly therebetween and upon reaching the peripheral face 55, the partly ground material is subjected to the crushing action of the crushing elements 47 rotating against the peripheral face 55 so as to nely pulverize the material. It is to be understood that the partly ground material slides down the peripheral face 5,5k between the crushing elements 47 which rotating with the grinding member 21 crushes the material to a line powder before the material is discharged into the receiving chamber 60.

In the form of the invention illustrated in Figures 4 and of the drawings, the grinding mill is illustrated inits application to a large commercial mill provided with hydraulic means for varying the downward pressure of the crushing elements. i

ln this form ot the invention, the grinding mill includes a housing 67 aixed to a support 68 and having a grinding member 69 aiiixed to vertically disposed shafts 70 and 71 rotatably mounted in

radial bearings

72 and 73 carried by a top housing section 74 and ai'spider 75 respectively. The grinding member 69 is similar in constnuction to the grinding -member 21 in the previous form of the invention and includes a hollow frusto-conical shaped member 78 in which is secured a hanged sleeve 79 to which the enlarged inner end of the shaft 70 is splined. Secured to the frusto-conical shaped member 78 is a cylindrical member 80 which forms a part of the grinding member 69 and to which the shaft 71 is rigidly axed.

The grinding member 69 is provided with a plurality of vertically spaced rows of teeth 81 formed on arcuate sectors 82 releasably secured to the member 78. The cylindrical member 80 is also provided with a plurality of vertically disposed rows of teeth 83 atiixed to arcuate sectors 84

andthe teeth

81 and 83 are disposed intermediate the rows of teeth 85 carried by a cylindrical casing 86 secured within the housing 67.

The grinding member 69 is also provided with a plurality of conical shaped crushing elements 87 which may consist of any desired number and, asl illustrated, are three in number disposed 120? apart. The grinding member 69 has vertically disposed shafts 88, each journaled for rotation in radial bearings 89 arranged in a cylindrical cavity 90 in the cylindrical member 80 and with the upper end of each shaft bearing against a thnust bearing 91 similar to the arrangement of the crushing elements 47 in the previous form of the invention. V'I-he crushing elements 87 rotate with the rotation of the grinding member 69 and have independent rotation in an opposite direction by engagement of the conical shaped faces thereof with an inclined peripheral face 93 of an annular member 94 affixed to the support 68 below the easing S6.

The material to be ground is fed to the mill through openings 95 in the housing section 74 and is progressively ground by the rotation of the grinding member 69 and upon reaching the peripheral face 93 is crushed to comminuted form by the action of the crushing elements 87.

The grinding material falls through openings y96 in the` spider 75 formed integrally with the annular member 94 and falls into a receiving chamber 97 provided by the cylindrical wall 98. The cylindrical wall 9 8 iS aixed by 4 screws or equivalent fastening means to the annular member 94 and has a bottom outlet 99.

A particular feature of the invention is the means for varying the pressure of the crushing elements 87 against the peripheral face 93 of the annular member 94. This is accomplished by a hydraulic piston 101 connected with the shaft 70 by a coupling 102 and with a thrust bearing 103 arranged between the upper end of the shaft 70 and the web of the coupling. The piston 101 is slideably disposed in an opening 104 in the wall of a hydraulic casing 105 aixed to a'head 106 of a tramey support 107 mounted on the housing section 74, A tiixed to the inner end of the piston 101 is a piston head 108 and with openings and 111 for admitting fluid under pressure to opposite sides of the piston head for movement of the piston 101 and shaft 70 in either direction by the pressure of the fluid admitted to the casing 105. The piston 101 extends throughy a packing gland 113 for preventing escape 0f the duidtlireiigh the npening 104 inthe easing 105..

Hydraulic iiilid is fereed inte the easing 105er either side of the piston head `108 for varyingA the pressure of the crushing elements 87 against the peripheral face 93 by means, di e pump 114 .eeiineeted with i1, manually eper'eted valve 1l5`l1y fluid feed line 1.16 The ,sneden Side ef the pump 1.14 is eenrieeted with e .1117 and e duid return line 1.18 extends treni .the valve t0 ,the inlet of the tank 117. The valve 11H5 is connected through one service port with the inlet 1,10 by means o f a fluid line Y119 and through the opposite service port by a fluid line 120 with theA Opening 11.1- Tlie valve is of standard unstruction vand is provided with a manipulating member 121 which when' moved in one direction supplies` tiuid to the casing 105 through the port 110 for'moving the piston head 108 downwardly to increase the pressure of the crushing elements 87 against the peripheral face 93. When the operating member 21 is moved in the opposite direction, huid will llew through the inlet 111 remove the Pisten head in .the opposite direction. The line 12,0 operates as a return line when fluid is supplied through the line 11.9 and when fluid is Supplied through the lin'e 120, the huid line 11.9 operates as a return line.

It will be understood that the inner race of the radial bearing 24 is splined on the shaft 22 to permit slight movement of the shaft with reference to the bearing when the nut 56 is turned on the shaftA 36 to increase the pressure of the crushing

elements

5,4 against the peripheral face 55. Likewise, in the modied form shown in Figure 4, the inner race of the radial bearing 72 is splined to the shaft 70 to permit of slight relative movement of the shaft 70 whereby the shaft may be moved downwardly by pressure of the duid in the upper portion of the casing 105 .i9 thereby increase the pressure of the crushing elements 87 against the peripherall face 93.

While the preferred forms of the invention are shown and described herein, it' is to be understood that the same is not so limited and shall cover and include any and all niedilieatiqnr 0f the invention Whieh falls within the purview thereof.

What is claimed l- .In a grinding mill., a eylindrieel easing arranged eri a vertieal arie' .and having inwardly Projecting eleniente 011 the inner periphery thereof, e grinding member having eutwardly rreieeting `eleinerits on the outer periph-y ery thereof, raid'grirding member being mediated ier rdtatieri Within reid'earirg ier. breaking up and pulverizing materiel between the elements en said grinding member and casing, said casing including a lower portion having e Central Opening therethrough previded with a periph'- eral' inner face ertending -dewnwardly and' inwardly in angular relation'to the vertical anisl of the casing, a plurality of radially arranged4 inverted conical shaped members, nieiliited en" Sheitr depending frein Said grinding memberier relative ratei-.ieu` et said. eenieel shared members with reference to said grinding member and disposed within the central opening in said lower portion, each of said'conical shaped members having a narrow portion of its peripheral face disposed in engagement with the inner face of said lower portion with said narrow portions of said conical shaped members ybeing arcuately spaced apart, and said conical shaped members rotating with said grinding member and having independent rotation by engagement-of the peripheral faces thereof with the inner face of said lower portion for crushing material between said conical shaped members and said lower portion. 2. In agrinding mill, a cylindrical casing arranged on a vertical axis and having inwardly projecting elements on the inner periphery thereof, a grinding member having outwardly projecting elements on the outer periphery thereof, said grinding member being mounted for rotation within said casing for breaking up and pulverizing material between the elements on said grinding member and casing, said casing including a lower portion having a central opening therethrough provided with a peripheral inner face extending downwardly and inwardly in angular relation to the vertical axis of the casing, a plurality of radially arranged inverted conical shaped members mounted on shafts depending from said grinding member for relative rotation of said conical shaped members with reference to said grinding member and disposed within the central opening in said lower portion, each of said conical shaped members having a narrow portion of its peripheral face disposed in engagement with the inner face of said lower portion with said narrow portions of said conical shaped members being arcuately spaced apart, said conical shaped members rotating with said grinding member and having independent rotation by engagement of the peripheral faces thereof with the inner face of said lower portion for crushing material between said conical shaped members and said lower portion, and means for applying downward pressure on said grinding member for varying the pressure of said conical shaped members against the inner face of said lower portion.

3. In a grinding mill, a cylindrical casing arranged on a vertical axis and having inwardly projecting elements on the inner periphery thereof, a grinding member having outwardly projecting elements on the outer periphery thereof, said grinding member being mounted for rotation within said casing for breaking up and pulverizing material between the elements on said grinding member and casing, said casing including a lower portion having a central opening therethrough provided with a smooth peripheral inner face extending downwardly and inwardly in angular relation to the vertical axis of the casing, a plurality of radially arranged inverted conical shaped members mounted on shafts depending from said grinding member for relative rotation of said conical shaped members with reference to said grinding member and disposed within the central opening in said lower portion, each of said conical shaped members having a smooth peripheral face with a narrow portion of its peripheral face disposed in engagement with the inner face of said lower portion and with said narrow portions of said conical shaper members being arcuately spaced apart, and said conical shaped members rotating with said grinding member and each having independent rotation by engagement of the peripheral faces thereof with the inner face of said lower portion for crushing material between said conical shaped members and said lower portion.

4. In a grinding mill, a cylindrical casing arranged on a vertical axis and having inwardly projecting elements on the inner periphery thereof, a grinding member having outwardly projecting elements on the outer periphery thereof, said grinding member being mounted for rotation within said casing for breaking up and pulverizing material between the elements on said grinding member and casing, said casing including a lower portion havingV a'- icentral" opening .therethrough provided with a rsmooth peripheral inner-'face vextendingdownwardly and inwardly in angular relation tothe vertical axis of the casing, a plurality of radially arranged inverted conical shaped members mounted on shafts depending from said grinding member for relative rotation of said conical shapedV members with referencel to said grinding members and disposedy within the central opening in said lower portion, each ofi-said conical "shaped members havingr a smooth peripheralface with a` narrow portion of its peripheral face disposed in engagement with the inner face of said lower portion and with said narrow portions of said `conical shaped'members being arcuately spaced apart, said conical shaped members rotating with said grinding member and having independent rotation by engagement of the peripheral faces thereof with the inner face of said lower portion for crushing material between said conical shaped members and said lower portion, and means for applying downward pressure on said grinding member for varying the pressure of said conical shaped members against the inner face of said lower portion.

5. In -a grinding mill, a casing including a cylindrical upper portion arranged on -a vertical axis and a lower portion having a central opening therethrough providing -a peripheral inner face extending downwardly and inwardly in angular relation to the vertical axis of the casing, a grinding member including a frusto-conical shaped upper portion, a cylindrical intermediate portion affixed to said frusta-conical shaped upper portion and a plurality of radially arranged inverted conical shaped members rotatably mounted on shafts depending from said intermediate portion and disposed within the central opening in said lower portion of the casing and having their outer peripheral faces disposed in narrow engagement with said inner face of said lower portion, means mounting said grinding member for rotation within said casing, said cylindrical portion of said casing and said frusto-conical and cylindrical portions of said grinding member having cooperating means for breaking up and pulverizing material therebetween with the rotation of said grinding member, said conical shaped members rotating with said grinding member and having 4independent rotation by engagement of the peripheral faces thereof with the inner face of said lower portion for crushing the material between said conical shaped members and said lower portion, and said peripheral inner face of said lower portion being arranged to receive the pulverized material discharged by gravity from between the intermedi-ate portion of said grinding member and the cylindrical portion of said casing.

6. In a grinding mill, a casing including a cylindrical upper portion arranged on a vertical axis and a lower portion having a central opening therethrough providing -a peripheral inner face extending downwardly and inwardly in angular relation to the vertical axis of the casing, a grinding member including a frusto-conical shaped upper portion, a cylindrical intermediate portion affixed to said frusto-conical shaped upper portion and a plurality of radially arranged inverted conical shaped members rotatably mounted on shafts depending from said intermediate portion and disposed within the central opening in said lower portion of the casing and having their outer peripheral faces disposed -in narrow engagement with said inner face of said lower portion, means mounting said grinding member for rotation within said casing, said cylindrical portion of said casing and said frusto-conical and cylindrical portions of said grinding member having cooperating means for breaking up and pulverizing material therebetween with the rotation of said grinding member, said conical shaped members rotating with said -grinding member and having independent rotation by engagement of the peripheral faces thereof witlilthe innerface ofAE saidllower portion for crushing the material? between-,saidconicalsliaped members and sad lower portion, lsaid peripherallinner face of said lower portion being arranged toreceive the pulverized material discharged by gravity from between'the intermediate portion ofsaid grinding member an'dthe cylindrical portion of" said'casing,. Saidgrinding member having a nonroiary shaft operatively connected with the intermediate portionthereo-and cooperating. means carried by said casing and, said shaftvfor varying the pressure on said shaft tothereby vary thepressure of said` conical shaped members -against-,theinner face of said lower portion of the, casing.

References Cited in the file of this patent UNITED STATES PATENTS Harris i Y June 6, 1882 Morris May 4,Y 1897 Day Aug. 6, 1907 Brown June 5, 1945 Sharp Jan. 7, 1947 Trayior Mar. 1S, 1949 FOREIGN PATENTS Great Britain of 1883 Canada Nov. 9, 1954 Great Britain Oct. 21, 1953