US1114103A

US1114103A - Pulverizing-mill.

Info

Publication number: US1114103A
Application number: US68440912A
Authority: US
Inventors: Benjamin C Bradley
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-03-18
Filing date: 1912-03-18
Publication date: 1914-10-20
Anticipated expiration: 1931-10-20

Description

13.0.BRADLBYi PULVERIZING MILL. APPLIUATION FILED MAR. 18, 1912.

1 1 1 4;, 1 O3. Patented 001;. 20, 1914.

2 SHEBTS*SEEET 1.

/y'a/miiz L'. radley.

THE MORRIS PETERS CO.. PHOTO-LITHC, WASHINGTON, D. L..

B. C. BRADLEY.

PULVBRIZING MILL.

APPLICATION FILED MAR.18, 1912. 1,1 14, 103.

Patented 0013.20, 1914.

2 SHEETS-SHEET 2. l

Q5 @MIM @Homey THE NoRRls PETERS Co.,PHOT0LlTH-1, WASHINGTON. D. C.

BENJAMIN o. BRADLEY, oE CANTON, oriio. i

rULvERIzING-MILL.

` Specification of Letters Patent. i i' Paiggntd 001;, 20,1914,

Application filed March 18, 1912. l Serial No. 684,409.

To all whom it may concern:

13e it known that 1, BENJAMIN C. BRAD- LEY, a citizen of the United States, residing at Canton, in the county of Stark and State of Ofhio, have invented certain new and useful improvements in Pulverizing-Mills, of

which the following is a specification.

My invention relates to improvements in pulverizing mills, especially designed for pulverizing cement and like material.

r1`he objects of the present invention are, first, to so arrange the various parts ofthe mill that the movable parts or more specifically the parts designed to pulverize the material will not become crystallized by eX cessive jarring, and second, to so arrange the various parts of the mill proper thatl complete pulverization is effected.` These objects together with other objects readily apparent to those skilled in the art I attain` by the construction illustrated in the accompanying drawings, although my invention may be embodied in various mechanical forms, the construction illustrated being deemed preferable to carry out the objects and purposes of my invention.

In the accompanying drawings-Figure 1 is a side elevation showing partsbroken away. Fig. 2 is a transverse section of one wing or portion of the carrier showing the pusher properly connected. Fig; 3 isa detached view of one of the grinding `ball drivers or pushers. Fig. 4 is a detached view of the ball remover. Fig. 5 yis an end elevation showing a part of the grinding chamber plate or cover broken away. Fig. 6 is a vertical section on line-H-, Fig. 1. Fig. 7 is a sectional view showing the lower end of the feed spout.

Similar numerals of reference indicate corresponding parts in all the figures of the drawings. i In the accompanying drawings 1 represents the power shaft which is j ournaled in suitable bearings 2, one bearing being located upon each of the supports 3 which supports are formed of a proper height and secured together in any convenient and well known manner. The supports 3 are of ordinary construction and are located upon a Upon the` suitable foundation or base. power shaft 1 is located and securely fixed the power lwheel or pulley 4, which power wheel or pulley is driven from any source of power. Upon the power shaft 1 is se-` curely mounted the carrier 5, to whichcari'ier arci pivotally `connected the grinding ball -drivers or pushers 6, which pushers are .provided with the arms 7, which arms are V connected to the carrier as best illustrated in Fig. 2. j i.

For the purpose of providing means for inserting-and removing the ball drivers or pushers 6 and their parts and the grinding balls 8, the carrier 5 is provided with the removable plate 9 when said plate is removed the balls 8, together with the drivers or pushers 6 canbe moved outward withlout disturbing the positionl of the carrier 5.

For the purposeof pivotallyconnecting the I'ball pushers or drivers 6 with the carrier 5, zthe cross-bolts 10 are provided, which crossbolts are located through the flanges 11 formed integral with the carrier and the detachable s. plate 9, `said bolts passing .through suitable apertures formed in the ifiangesll, the plate9 and the arms 7. `Around the carrier 5 and concentric `there- `with is located the grinding ring 12, which ,grinding ring issecured in position with grefeience to the `fixed casing or housing 13. lTlie grinding ringz 12 is provided with the ball race or groove 14, which race or groove is f or the purpose of receiving the material ,designed to `be rground or pulverized The j grinding surface ofthe groove 14 is curved i fin cross section, the curvature correspond'-y ing substantially with the spherical ;curva- {ture of the grinding balls 8.` It wllbe understood. that as the grinding balls ,8

,come in Contact `with the grinding surface lof the. groove 14 in the grinding ring 12,

they will travel lover and upon the material in said groove 14.

"For the purpose of` allowing the ball` drivers or pushers `6 to` move `backward the springs 15 are provided which springs are located against the `backs of the ball drivers or pushers 6 and the flanges orspring seats `lformed'upon the carrier 5. In use I prefer to formthe flanges or spring seats 16 in* tegral with the carrier 5, but yif desired said flanges or spring seats may be formed separate and attached in any convenient and well known manner.

It will` be understood that by pivotally attaching the pushers` 6 `at points spaced from the aXis of the carrier andsaid pivotalpoints being at the rear of the grinding balls 8 the pivotal movement `of the pushers will be in substantialfuniso'n at the `slight backward movement of the grinding balls, thepushers i iio 6 being held in contact with the rear surfaces .balls coming in contact with the larger particles of material located in the path of the balls. By thus cushioning the balls and removing the sudden arring action the cause of crystallization to adjacent parts is to a great extent removed, owing `to the fact that there is a yielding movement as between the grinding ball and the carrier.

For the purpose of providing means for conveying ymaterial to be pulverized to the machine proper la hopper 17 is provided, which hopper is provided with the gate 18, which gateis of the usual construction. Below and at one side of the hopper is located the feed screw 19, whichfeed screw is located upon the shaft 20, which shaft is provided with the stepped pulley 21. Below the chamber of the feed screw 19 is located the feed trough or spout 22, which feed trough or spout extends downward and its bottom or lower end or portion is curved as illustrated in Figs. 5 and 7, said lower end or portion being curved for the purpose hereinafter described. The lower portion of the feed trough or spout 22is provided with a suitable opening so as to allow material to pass from said feed trough into the grinding chamber. As the material passes down the feed spout'22 it is delivered upon the grinding ring 12', .and for'the purpose of assisting in conveying the material into the groove 14 formed in the grinding'ring 12 the ball drivers or pushers 6 are provided with the inclined curved flanges 23, said flanges being v located in such a position that they will come in close proximity with the inner surface of the grinding ring and upon opposite sides of the groove 14 by which arrangement the material is moved inward and into the groove 14 formed in the grinding ring 12.

with the grinding chamber.

the'pulleys 30 and 31 in connection with an ordinary belt.

Within the fan chamber 25 are located the kscreens 32 and 33 which screens are properly inclosed by a suitable casing 34. The inner screen 33 is relatively coarse as compared with the outer screen 32, the outer screen being of such a mesh that no material except that brought to the desired fineness is to pass; but if material should pass into the fan chamber 25, which has not been properly reduced or brought to the proper degree of fineness but of sufficient fineness to pass through the inner screen it will be returned to the grinding mechanism by means of the inclined bottom 35, the material not passing through the inner screen will be discharged through the openings 3G formed in the plate 37 and thence to the inclined bottom For the purpose of creating a suction through the grinding mechanism and from the feed spout the defiecting blades 24 are inclined and the fan blades 27 also inclined, the forward ends of said

blades

24 and 27 are curved whereby the suction is increased, but the same object can be accomplished without the specific curvature shown.

It will be understood that by reason of the

blades

24 and 27 being inclined and by reason of the curvature of the bottom or lower end of the feed spout 22 a suction will vbe produced, the air being taken in to the grinding chamber and fan chambers from the bottom or lower end of the feed spout, which bottom or lower end communicates The purpose of creating the suction or more specifically taking the air from the feed spoilt is to prevent the dust or finer particles of material from finding its way into the room or place where the machine may be located.

It will be understood that in order to ereate this suction the rotation of the carrier 5 must be in the direction indicated by the arrow Fig. 6. For the purpose of protecting thepower shaft 1 and at the same time dividing the blast or current of air the shield 38 is provided, the top portion of said shield being convexo-concave and its lower portion or the part 39 inclined downward and under the power shaft 1. As the fan blades 27 are rotated the greater portion of the air will be driven or forced under the shield and pass between said shield and the plate 37 thereby creating a lifting suction from the chamber located below the plate 37.

It will be understood that all material brought to the proper degree of fineness to pass through the outer screen 32 will be conveyed to the delivery spout 40. The fan shaft 28 is provided with a pulley 41, which pulley is for the purpose of driving the pulley 42 mounted upon the counter shaft 43 by means of the belt 44. Upon the counter` shaft 43y is located the stepped pulley 45,

ita

which stepped pulley is for the purpose of driving the stepped pulley 21 mounted upon the shaft 20. By providing the stepped pulleys 21 and 45 the speed of the shaft 20, together with the conveyer blade 19 can be varied thereby regulating the feed of the material to the mill proper. The gearing here illustrated to rotate the shaft 20is shown conventionally and it willbe understood that any method of gearing may be employed without departing from the nature of my invention.

It is well understood that the grinding balls 8 and the pushers or carriers Glare of considerable weight and by reason of the rapid wearing away of the grinding balls it is necesary `to remove the worn balls and substitute new ones at frequent intervals and in order to do so with convenience I provide a trough shaped plate 46, which may be placed in the position illustrated in Fig. 5.

For the purpose of retaining the balls in proper relative position with reference to the pushers 6, said pushers are provided with the forwardly extended fianges 47.

F or the purpose of holding the springs l5 in their seats the pushers 6 are provided with the pins 48, which pins are preferably formed integral with the pushers 6, but of such a length that they will not interfere with the actions of the springs.

Having fully described my invention what I claim as new and desire to secure by Letters Patent, is-

l. In a pulverizing mill, the combination of a shaft, a carrier mounted upon said shaft, said carrier provided with grinding balls, a grinding ring, a fan chamber located at one side of the grinding mechanism, said fan chamber inclosed by screens of different mesh, a fan located within the chamber and means for actuating the fan, a

shield located below the fan and provided with a downwardly inclined portion, said downwardly inclined portion extended below the carrier shaft, substantiallyT as and for the purpose specified.

2. In a pulverizing mill the combination of a shaft, a carrier mounted upon said shaft, grinding elements carried by the carrier and a fixed grinding ring, a fan chamber located at one Vside of the carrier, said fan chamber inclosed by screensof different mesh, a curved plate located below the fan and between the lowerspaced ends of the screen having the larger mesh, said plate provided with openings and one end of said plate spaced from the screen having the larger mesh, substantially as and for the purpose specified.

3. In a pulverizing mill thecombinatiou of a shaft, a carrier mounted upon said shaft, grinding elements carried by the carrier and a fixed grinding ring, a fan chamber locatedat yone side of the carrier,` said fan chamber inclosed by screens of different mesh, a curved plate located below `the fan and between the lower spaced ends of the screen having the larger mesh, said `plate provided with openings and one endof said` plate "spaced from' the vscreen having the,` larger mesh, and a shield located between` the fan and said plate, substantially as and for the purpose specified.

4; In a pulverizing mill, the combination of a shaft, a carrier mounted upon said shaft, grinding elements carried by the carrier and a fixed grinding ring, afan chamber located at `one side of the carrier, said fan chamber inclosed by screens of different mesh, a curvedplate located `below the fan and between the lower spaced ends of the screen having the larger mesh, said plate provided with openings, and one end of said plate spaced from the screen having the larger mesh anda shield located between the fan and said plate, said shield located within the fan chamber, substantially as described. y i

'5. In a pulverizing mill, the combination of a shaft, a carrier mounted upon said shaft, said carrier provided with grinding elements, pushers provided `with `spaced arms, one of said arms pivotally connected to the carrier and the other arm pivotally connected to a plate detachably connected to the carrier, said pushers adapted for contact with the rear surfaces ofthe grinding elei,

ments, a fixed grinding ring located coneentric with the carrier, a fan chamber located `loto at one side of the carrier provided with the grinding elements, a feed spout curved at its bottom or lower end and provided with an opening leading into the `grinding chamber, substantially` as and for the *purpose specified.

6. 'In a pulverizing mill, the combination `of a shaft, a carrier'mounted upon said shaft, said carrier provided lwith grinding elements, pushers provided with spaced arms, one of said arms pivotally connected to the carrier and the other arm pivotally `connected to a plate detachably connected to the carrier, said pushers adapted for contact "with the rear surfaces of the grinding elethe grinding elements and pushers, substan-` V tially as and for the purposesspecied. y

7. In a pulverizing mill of the class described, the combination of a shaft, a car rier mounted upon said shaft, said carrier provided with grinding elements and a fixed grinding ring, a fan chamber located at one iso side of the ygrinding elements, a fan shaft and fans mounted upon said shaft, said Jfans locatedy Within the Chamber, said fan blades inclined atan angle to a line parallel with the fanshaft, and deiiecting plateslocated i upon the carrier and inclined to correspond with the inclination of the fan blades, substantially as and for the purpose specified. ,l 8. In a pulverizing mill of the class described, the combination of a shaft, a carrier mounted upon said shaft, said carrier provided with grinding elements and a .Fixed grinding ring, a fan chamber located at one side of the grinding elements, a fan shaft and fans mounted upon said shaft,

said fans located within the chamber, said fan blades inclined at an angle to a line parallel with the fan shaft, and deflecting plates located upon the carrier and inclined to correspond With the inclination of the fan 20 blades, and a feed spout provided with a lower curved end, substantially as und for the purpose specified.

In testimony that I claim the above, I

have hereunto subscribed my naine in the 25 Copies of vthis patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C.