US1711063A - Pulverizing mill - Google Patents

Description

April 3o,` 1929. y

7 R., SQ RILEY PLvERIzING um.

Filed Jan 5, 1924 4 VSheets-Sheet 7 1 ATTO EYJ.

April 30, 1929` R.' s. RILE-v 1,711,063

PULvE'RIzING MILL Filed Jan. s, 1924 .4 Sheets-Sheet 3 mms/TOR.'

5055er R/LLY Patented Apr.` 30, i

4PA'IE-15Vr OFFICE.

UNITED STATES i EoEEnT s. RILEY, or -woEcEsTE-n, mssAcnbsETTs, saumon To sam-ono EILEY sToxEE coMrANY, oir woEcEsTEE, MASSACHUSETTS, A oonToEATIoN or las SACHUSETTS.

r'ULvEEIzING u1u..

Application medianuaryys, im. smal no. ascesi.

' This invention relates to a mill for'pulverizin dry coal, cement or other material of simi ar structure. rThis mill is designed -for continuous operation, with automatic 5 feed of the coarse materialto one end of the mill and continuous delivery of the pulverized product from the other end of the mill.

One object of my invention relatesl to the provision of improved devices for producing l the pu'lverizing action and particularly to an improved construction 'of roll hammer-for use in such a machine, thisl hammer having both a roller and a ball-action. I have also j provided an indicating device by means of l which the position of the roll hammers relai tive to the tread orv bull ring may be observed during theoperation of the machine.

A veryimportant feature of the invention lies in the particular construction of the bull ring, the conical convergingr walls of which are effective to feed the material under the hammers and thus enable the machine to operate without the kuse' of the customary plows,savino' much power 7and expense. j

Another object of my invention is to provide an improved mechanical separatingidevice at the discharge end of the mill by means of which the coarser particles Vof material may be separated from the fine pulverized particles and may be returned tothe mill for further reduction. s.

Another feature of my invention relates to the provision of an improved separator of the gravity type which will return any remaining coarse particlesor tailings to the hopper from which the machine is fed. In

the Vpreferred form, the operation of thisV gravity separator may be adjusted andcontrolled by regulating devices'to be described.

I have also provided an improved form of hopper, having provision for adjustment, of

the feed without change in the rate of actuation thereof.

In a modified form of my invention, I have shown a machine in which a supplemental pulverizing agency is provided, acting -upon the material after it has passedthrough the roll hammer 'mechanism and serving as a substitutel for the mechanical separating device above referred to. My `invention further relates to arrangementsand 'combinations of parts which will be hereinafter describedand more particu- )arly pointed out in the` appended claims.

A preferred form of the invention is shown in the drawings in which Fig.' 1 is a longitudinal sectional elevation of my improved machine; n Fig. 2 is an end elevation thereof, looking in the direction of the arrow 2 in Fig. 1;

Fig. 3 is a sectional elevation` of one of the roll -hammers and its support;

Fig. 4 is a transverse sectional elevation, taken along the line 4--4 in Fig. 3 and showing'the spider or support for the ball ham-V mers;

Fig. 5 is a perspective view of the mechanical separating device;

Fig. is a diagrammatic plan view of c ertain driving connections;

Fig. 7 isa sectional end elevation of the l hopper and feedingdevice; Fig. 8 is a partial longitudinal sectional? elevation of ther same parts Fig. 9 is'a detail plan view of the hopper ad] usting mechanism; and

' Fig. 1.0 is a artial sectional side elevation showing a ino ited construction.'

Referring particularly to Figs. -1 and 2, I.

have shown a pulverizing mill comprising va casing 10 within which is rotatably mount ed an annular rotatable member 11 having-a gear 12 formed on its outer face. The member 11 rotates in fixed bearings 13 and acts as a support :for a bull ring 14. The ring 14 and member 11 have co-operating tapered -contact surfaces and the ring 14 is securely held to its seat in the member 11 by ahead 16 bolted to the side of the member 11 and having clamping screws 17 threaded therein and engaging the larger end of the bull rin 14.

A plurality of roll hammers 20 are rotatably mounted upon arms 21 (Fig. 3) which in turn are pivoted at 24 to a frame or spider 25 keyed or otherwise secured to a drive shaft 26. The frame 25 isprovided with pairs of spaced arms or projections forming sepa.

rated bearings for the arms 21,.as clearly iii- `dicated in Fig. 4. Upon the face adjacent the rolls, the frame 25 is provided with inclined ribs 27 which strengthen the bearing arms and act to assist the -feed of material.

Each roll 20 has an end ring-30 secured thereto by screws or Vbolts 31 and providing an annular recess for a collar 32 fixed to its arm 21 by a tapered pin 33. Each roll 20 is also preferably provided with a bushing,

or bearing sleeve 34 and suitable provision is made for introducing lubricant to' the bearing through an oil assage in the arm 21. A shield 36 exclu es coal or other material from the bearings of the arms 21.

An indicator arm'37 is fixed to one of the roll hammer arms 21 and extends toward the axis of the shaft 26. A rod 38 is slidable in a groove 39 in the shaft 26 andextends beyond the right hand end of the shaft, as shown in Fig. 1. A pointer 40 may be provided on the casing 10l of the driving mechanism and the end of the rod 38 maybe graduated as indicated at 41. A glance at these graduations will indicate accurately the position of the roll hammers with reference to the bull ring at any time during the operation of the machine.

The axis of the drive shaft 26 is preferably offset downwardly from the axis of tht` member 11 and gear 12, for a purpose to be described.

Any suitable .driving means may be\pro vided for rotating the ring supporting member 11 and the roll hammer supporting frame 25. As shown herein, the shaft 26 is provided With a gear 42 (Figs. 1 and 6) engaged by pinion 43 mounted on a counter shaft 44 having a pinion 45 meshing with a gear 46. The gear 46 vis fixed to a second counter shaft 47 having a pinion 48 which drives the ring gear 12 previously described. Shaft 44 may be driven by an electric convenient manner` l motoror in any other A hopper 50 (Figs. 1 and 7) is provided `for feedinv the coarse material to the pulverizino' mill. The hopper may be connected by apipe 51 to any suitable storage space from which a sup ly of raw material may be conveniently received. The hopper 50 has an offset -discharge opening 52 (Fig. 7) and e has a feeding device 53 rotatably mounted between the hopper and the discharge opening 52. The feeding device 53 is mounted upon a shaft 54 to the end of which is secured a ratchet` ring or cog wheel 56 with which a pawl 57 is intermittently engaged.

' The pawl 57 is mounted upon a feed lever 58 (Fig. 2) connected by a link 59 to a pin 60 eccentrically mounted in a gear 61 engaged and driven by a pinion 62 on the shaft 26.

Through these connections, the feeding de- I vice 53 in the hopper 50 is angularly advanced with a relativelyslow intermittent movement. The feeding device 53 has a plurality of axial feeding blades 63 (Fig. 7). A s the vblades -63 rotate past an vopening .64 in the side of the hop er 50, the recesses between the blades are lilledwithcoal or other material, which is carried around' by the blades and is dischar ed through the opening 52.

It is often esirable toclian' e the rate of feed of material tothe mill wlthout changing the gear connections to the crank gear leand for this purpose I have provided the the shaft 54,

conical part of the a series of four blades 81 arrangedaxia the driving shaft 26 and extending radially members 66 at one end thereof. One of the members 66 extends between each two adjacent blades 63 `of the feeding device 53.

-These members 66 are `closed at their'outer or segmental faces, so that they complete a desired portion of the cylindrical surface of the feeding device and leave no recess in such portion to receive material as the blades 63 rotate 'past the opening 64. Suitable means i's-provided for adjusting the sleeve and the adjusting member V66 axially of nuts 67 (Fig. 9) threaded on rods 68 fixed in the hopper casing' 50. 4 The nuts 67 are grooved orllanged and fit between the upper and lower lparts of a plate 69 which acts as a yoke for a grooved end portion 70 of the., sleeve 65. By turning the nuts 67 the sleeve be adjusted axially. V- With this construction, the length of the 65 and members 66 Vmay recesses in the feeding device may be varied Vto increase 0or"decrease the capacity of the feeding device at each intermittent actuation thereof. 4

A blade 72 (Fig. 7) is secured in the hopper-50 and tends to break up adhering masses of coal as they enter the hopper and to cause siron or other heavy material to pieces of fall to a recess or pocket 7 3 formed belowr the such means comprising wing feeding opening 64 and well adapted to rel ceive such heavy material. A cap or'plate 74 closes an opening 75 through which the material' collected in the pocket 73 may be removed.

The material fed fromthe hopper passes downward in the' casing 10` and is gradually fed to the bull ring past thespider 25. The hammers 20 have a combined roller and ball action on the'material. The straight line or hammer is preferabl at a slight angle to the adjacent surface o the bull ring, so that the coal isxsubject to an increasing crushing action as Vit is advanced across the ring. The rounded or ball portion of the hammer then has a pulverizing action similar to the usual ball mill.

As the coal or other material is ground or ulverized between the balls 2() and the bul ring 14, the fine pulveriz'cd material is drawn through a' discharge opening 75 in the casinglO into a gravity separator 76 with whichis connected 'a suitable.4 exhaust -fan (not shown).

As the material is dravvmtovvard the-dis i charge opening, it passes a fan-like mechanical separator or rejector 80, most' clearly shown in Fig. 5. The rejector 8O com rises ly of ,from the axis. Upon the leading face of each of the blades 81 there is provideda guide 0r llO flan e 83 which is inclined toward the axis of t e shaft 82 in the direction of theV dis# chargel opening 5.

As the pulverized material passes through the fan-like rejector 80, the line material asses freely along into the gravity separator course through the gravity separator 76 which has an outer casing 85 and an inner conduit-86 having an extension 87 communicating with v lthe hopper 50. A swinging check'valve 88 permits downward movement yof material. lthrough the extension 87' but prevents entrance of air in the opposite direction.

` A discharge pipe 90 at the top of the casing A is connected to suitable exhaust mechanism (not shown) as previously stated. The pipe has a sleeve 91slidably mountedthereon, with its lower end extending below the upper end ofJt-he conduit 86. Adjusting screws 92 are provided by which the sleeve 91 may be raised or lowered to vary the projection of the sleeve into the conduit 86.

As the pulverized material is drawn upward through the ravity separator 76, it necessarily follows t el direction of the arrows a in Fig. 1, passing over the upper'end of the con- .duit and downward around the lower end of lthe sleeve 91. As the direction of movement is reversed, the heavier particles fall into the conduit 86 and are delivered by gravity to the hopper 50,'while the lighterparticles pass upward to the discharge pipe 90.

Suitable packing rings 95 and 96 (Fie. 1)

are provided to prevent escape of the pu verized material during its -passage through'the mill. An annular pocket 97 is formed at the right hand end of the bull ring 14, within which articles of iron and other heavy material may conveniently collect. A ring or clinedsurfaces is very important.

of the conical orincllned surface -on the enflange 98 on the shaft 26 forms an inner limit or stop for the hammers 20.

The inner face of the bull ring 14 is formed with two oppositely inclined or conical surfaces and the effect of these oppositely in- The action traneeside, assisted by' centrifugal force, is to` Y feed the material forward under the roll ham# mers, while the action of the second inclined' surface is to reverse the feed of the coarser particles, returning them under the hammers, while the inermaterial passes along to the rejector 80.

, In Fig.

pplveriz'ingand rejecting device is provided tween the' bull ring 14 and the lower end of place.

10, I have shown a slightly modified form of my invention `in which a combined` the gravity. separator 76. This device comprises a disc 100 mounted upon an independently rotated shaft 101 and aving a series of pins 102 fixed in the left hand face thereof, alternating with pins 103 fixed. in a casing member 104. v

As the 'pulverized material. leaves the hammers, it is drawn around the outer edge of the disc 100 as indicated by the arrow b in Fig. 10

and is then drawn inward pastvthe pins 102 and 103 to the discharge opening 105 at whichl point it is delivered to the. gravity separator Having thus described my nvention, it is believed that the operation will beclearly apparent. supply of suitable'material isfed to the hopper V50 through the feed pipe 51 or in any Vother .convenient manner and the-material' is intermittently fed `from the hopperfin measured quantities to the roll hammers and bull ring which are preferably rotated asdescribed 1n opposite directions. The rolls-20 are free to turn upon their supporting pins 4and in Contact with' the bull rmg and are swung strongly outward by centrifugal force. The outer wall of the roll portion of each hammer is inclined relatively to the adjacent conical. wall of the bull ring, so that the material as it advances issubject to an increasing crushingaction, but the roll wall and ring are out of direct Vcontact in this ortion of the mechanism.` The material is ed forward by the combined ei'ect of centrifugal force and the outwardly inclined tread of the bull ring.

The return of the coarser particles under the hammers has been already, explained.

`As the material is pulverized, it first passes the rejector 80- which turns back the coarser particles for` further treatment. The liner particles .pass to the gravity separator 76 where further separation by gravity takes The coarse particles or tailin sepa- Y rated at this point are returned to t4 e hopper for further reduction.

The combined crushing and pulverizing ac- I tion Yof 'the hammers 20 has been fully described. By offsetting the axis of rotation of the spider and hammers relatively to the bull ring or tread 14, the effect of gravity on the hammers is vsubstantially balanced by the increased centrifugal action at the longer rad-ius and the pressure of the hammers on'the material islar ely equalized.

Having t us described my invention and the advantages thereof, Ido not wish to be limitedto the details herein disclosed otherwise than asset forth in the claims, but what I -said ring',a rotatable member,

Y tively rotate said member, said hammers hav- `ing' ball shaped outer ends and` straight/ line Y portions associated therewith, the ring and member being driven-continuously inoppo- Site directions. i

2. A Yulverizing mill having, in combination, a ull ring, means to positively rotate said ring, a- Arotatable ,membeig a plurality of roll hammers rotatably and pivotally connected to saidmember, and means to positively rotate said member, said hammers havingball shaped outer ends and having straight line roll surfaces slightl inclined to the adjacent inner face of the b ring when swung outward to approximate engagement therewith, the ring and member being driven continuously in opposite directions.

Y3. A pulverizing mill having, in combination, a bull ring, means to positively rotate said ring, a rotatable member, a plurality of roll hammers rotatably`r and pivotally conand means to positively rotate said member, said hammers having ball shaped ends and straight line roller surfaces slightly inclined to said 'bull ring,

whereby to crush and pulverize'the material with an increasing crushing roller action at the entrance side of the ring and with a ball pulverizing action at the dischargefside of the ring. v

4. In a pulverizing mill, a rotating mem-- ber, swinging arms mounted thereon, rotatable crushing devices on said arms, and means to indicate the radial position of said devices.

5. In a pulverizing mill, a rotating member, swinging arms mounted thereon, rotatable crushing devices on said arms, a shaft'on which said member is mounted, an indicating rod slidable axiallv of said shaft, and connections from said rod to said swinging arms.

6. vIn a pulverizing mill, a bull ring, and meanst positively rotate said ri tatingmember, a plurality of roll hammers each individually rotatable and pivotally mounted to swing on said member, and means to rotate said member, the axis of rotation of said member being out of alignment with the axis ofsaid ring.

7In s. pulverizing mill, a bull ring, and means to positively rotate said ring, a rotating member, a plurality of roll hammers each individually rotatabler and pivotally mounted to swing on said member, and means to rotate said member, the axis of rotation of said member'being positioned. slightly belowthe axis of said ring.

' 8. pulverizlng mill having, in combinaand means to tion, a bull ring, means to positively rotate -ing roller action at the entrance side of the ring and with a ball pulverizing action at the discharge side of the ring, the bull ring being always out of direct Contact with the hammers in the roller portions thereof.

9. A pulverizing mill having, in combination, a bull ring, means to positively rotate said ring, a rotatable member, a plurality of hammers mounted thereon for substantially radial operative movement, and means to rotate said member, said bull ring having a conicl'al surfaceco-operat-ing with centrifugal orcetofadvance the material toward the centralportion of the tread, the bull ring and member being `driven continuously in opposite directions. Y

l0. A pulverizing mill having, in combination, a bull ring, means to positively rotate said ring, a rotatablemember, a plurality of cone shaped hammers mounted vthereon for substantially radial operative movement, and a rotor to rotate Said member, said bull ring .having a conical surface co-operating with centrifugal force' to return coarser particls from the crushed material toward the central port-ion of the tread, the cone portion of the hammers and the ring being angularly spaced from each other.

11. A pulverizing mill having, in combination, a bull ring, meansto positively rotate said ring, a rotatable member, a plurality of cone shaped hammers mounted thereon for substantially radial operative movement, and

means to rotate said member, said bull ring having oppositely disposed conical surfaces co-operating with centrifugal force to feed the material toward-the central portion of the tread, and the ring being angularly spaced Yfrom each other. 1

12. A pulverizing mill comprising abull ring, a rot-ating member, a plurality of roll hammers movably mounted on said member,

said member, said hammers each comprising a ball shaped end and a straight side roll portion, the roll portion of tion of their length when in crushing relation.

13. A pulverizing converging and relathe. cone portion of the hammers said hammers beingv positioned at al slight angle to the adjacent tread Qf said ring, and thus providing a out of direct contact',

apparatus comprisinga casing having an inletfor coarse material andan outlet for the n'ely pulverized inapositively rotate lsaid ring and Y Cah terial, a bull ring and rolls associated therewith near the inlet for pulverizing the coarse particles, and rapidly revoluble impact members arranged in the path of the material traveling from the first zone to the outlet which are arranged to finely pulverize the material ted thereto. v

14.-. A pulverizing apparatus comprising a casing provided with an inlet and an outoutlet.

let respectively on opposite sides thereof, means forming two pulverizing zones connected by an annular passage, means in the,

pact members in' the second chamber arranged to finely pulverize the material as it passes to the outlet.

16. A pulverizing apparatus comprising a casing having an inletV and a centrally located outlet on Aopposite sides thereof, means forming'two pulverizingzones connected by an annular passage, means including yieldable, pivotally mounted crushing members arranged in the rst zone adjacent to the inlet for preliminarily crushing the material, and revoluble impact members on the rotor' and stationary impact lmembers which are located on the casing'in'the second zone near the outlet and serve to linel pulverize the material as it travels inwar 17. A pulverizing' apparatus comprising a casing having an inlet and acentrally located outlet on opposite sides thereof, .means forming two pulverizing zones connected by an annular passage, 'means including yieldable, pivotally mounted revoluble members in the irstzone adjacent to the inlet to pulverize the material preliminarily, a series of pegs in the second zone revoluble about the Vaxis of the pulverizing members in the first zone and-stationary pegs on the casing associated with the revoluble pegs to pulverize the material finely as it passes inwardly towards the outlet.

18. pulverizing apparatusC comprising a casing having an inlet and a centrally located outlet on opposite sides thereof, means forming two' pulverizing zones between the inlet and outlet which are connected by an unobstructed annular passage, means includ-` ing yielding, pivotally mounted revoluble members in the iirst zone near the inlet to pulverize the material preliminarily, and impact members in the second zone between said passage and the outlet which revolve rapidly about a horizontal axis and pulverize the material finely as it passes inwardly towards the outlet. a

19. In a pulverizing mill having a pulver-` izino' mechanism a ho er a feeding connection from said hopper to said mechanism,

and a discharge conduit, the combination therewith of a mechanical separator. in the entrance to said conduit, a gravity separating device located in said conduit and a means to collectV in said gravity separating device the coarse tailings which pass said mechanical separator and to return said tailings' to said hopper..

20. In a pulverizing milly having a casing with a discharge opening, a pulverizingmechanism 'including a plurality of rotatable crushing devices, anda bull ring cooperating with vsaid rotatable devices, the vcombination therewith of a disk rotatable relativeAA to said ring and adjacent said opening, a plurality of pins arranged in concentric circles on said disk, and additional pins fixed on said casing and alternating with said circles of' movable pins, said pins anddisk acting upon the material after it has passed b8- tween the rotatable crushing devices and the bull ring and acting to further pulveriz'e towards the Y said material. y

l21. A pulverizmg'apparatus comprising a casing having an inlet for coarse magterial and anl outlet for pulverized material, means forming two pulverizing zones adjacent the inlet and outlet respectively, revoluble members in the first zone arranged to preliminarily crush coarse material, impact menig' bers inthe second zone for producing ine pulverization, means for driving the impact i members, and means for driving the revolu ble members at a diierent speed from that of the impact members.

In testimony whereof iixed my signature.

Romani s. RILEY,

I 'have hereunto af-

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