US1603520A

US1603520A - Regulator for pulverizing mills

Info

Publication number: US1603520A
Application number: US12678A
Authority: US
Inventors: Crites Joe; William H Vogel
Original assignee: RAYMOND BROTHERS IMPACT PULVER
Current assignee: RAYMOND BROTHERS IMPACT PULVER; RAYMOND BROTHERS IMPACT PULVERIZER CO
Priority date: 1925-03-02
Filing date: 1925-03-02
Publication date: 1926-10-19
Anticipated expiration: 1943-10-19
Also published as: DE457997C; FR611958A; GB248357A

Description

Oct. 19 1926.

, J. cRlEs ET ALj REGULATOR FAOR PULVERIZING MILLS Filed March 2 ,i 1925 l I aieaa1i. ia,

JOE CRITES, OF EVANSTON, AND WILLIAM H. VOGELVOF HIGHLAND PARK, ILLINOIS, i

ASSIGNORS '10 RAYMOND BROTHERS IMPACT .'PULVERIZER CO., OF CHICAGO, ILLI` NOIS, A CORPORATION OF ILLINOIS.

REGULATOR FOR PULVERIZING MILLS.

Application filed March. 21925. SeriaIiNo. 12,678.

This inyention relates' to means for pulverizing fue-l, and more particularly to improvements in a pulverizing mill of the impact type, in which a plurality of swinging hammers operate Within a substantially cylindrical beater chamber.

The principal objectv of theinventon is to provide improved means for adjusting the fineness of the pulverized material produced, such means being accessible for adjustment from outside the mill, without necessarily stopping the operation of the mill; j

More specifically, a rotary regulator is interposed between the beater chamber and the fan chamber of the mill, which acts to retard more or less the passage of coarse material from the beater chamber to the fan chamber. A normally stationary conical ring which surrounds this rotary regulator, is adjustable toward or from the regulator by means which are readily accessible from outside the mill, thus varying the operation of the regulator, and determining `its retardn ing influence upon the material in the air passing therethrough.

The above and lother objects and advantages of this invention will be more apparent from the following detailed description of one approved form of the apparatus.

In the accompanying drawings:

Fig. 1 is a central vertical longitudinal section, partly in elevation through tlie main portions of the mill. j

Fig. 2 is a transverse vertical section taken substantially oir the line 2--2 of Fig. 1.

Fig. 3 is a perspective view of the conical adjusting ring.

The mill, as here shown, is of the wellknown impact type, and comprises a feeding compartment 1, a beater chamber 2 in which the pulverization process takes place, and a fan chamber 3. A horizontal shaft 4 extends centrally through the substantially

cylindrical chambers

2 and 3, and is rotat ably supported at its ends, outside of the chambers, in bearings 5` and 6. One projecting end 7 of shaft 4 is conncctedwitlan electric motor or other suitable driving means. l/Vithin the beater chamber 2, the pulverizing mechanism 8, hereinafter more specifically described, is fiXedly mounted on rotary shaft 4, and a fan 9 is similarly mounted on shaft 4 Within the fan chamber 3.

The material to be pulverized is maintained within a hopper or other storage receptacle, the lower end of which is indicated at 10, and the flow of material from this receptacle into feeding compartment 1, is regulated by the slide valve 11. Below the valve 11, a. fpocketed feed wheel'12 is mounted on a sha t 13 to rotate ina clockwise direction, Fig. 1, and thus steadily feeds measured quantities of the material into 'the lower portion of feeding compartment 1 and thence through inlet opening 14 into tlie inlet end of beater chamber 2. The shaft 13 is inter mittently driven at an adjustable slow speed, by a mechanism not shown, from the shaft 15 in the loiver portion of the .mill housing, which shaft 15 is driven through suitable reduction gearing and the belt 16 from' the main rotary shaft 4.

The pulverizing mechanism 8 comprises a plurality (here shown as three duplicate'i'adial series). of beaters or'liammers 17, pivotally mounted at their inner ends 18 for limited swinging movement. within a frame or spider composedl of a series of plates or discs 19 keyed on shaft 4. These plates 19 are spaced apart by rings 20. and are clamped in assembled position with-the rings 20 upon shaft 4, between the fixed collar 21 on said shaft, and a nut 22 adjustable ,along said shaft 4. Suitable liner members (not here shown) are preferably arranged about the path of travel of hammers 17, and within the enclosing wall of the beater chamber 2, and the material is pulverized partially by the' impact of the hammers 17, and partly by being projected by centrifugal force against these liner members.

The fan 9 withdraws the pulverized material suspended in air from beater chamber 2 througli'the outlet opening into fan chamber 3, and projects this fuel-laden air through conduit 24 to a suitable storage bin or directly .to the burners where it is cousumed. Air is supplied to the beater chamber 2, from the inlet pipe 25 and through feeding 'compartment 1, and additional air may be supplied to fan chamber 3 through an adjustable inlet opening 26.

lvounted on shaft 4 adjacent the opening 23 between beater chamber 22 and fan chamber 3, is the rotary regulator 27, comprising a central spider and a series of radially disico I, posed plates 28. rIlle ends of these plates 28 are Vpreferably inclined as shown' at 29,and

positioned to-travel within a short distance 'of thefinner face'of the coni-calming: 30,

which forms the inner' directing 'wall of out# let-23. The-action of this regulator isipto reduce very materially the amountof coarse material vinthe air passing through outlet 23 into the fan chamber. This'regulator 'acts as a fan for continuing the rotary movement of thecontents ofbeater chamber 2 aboutl the axis of 'shaft 4, and by centrifugal force throws the material against the diagonally disposed face of ring 3() from which it is i thrown back into the beater chamber. The

amount of coarse material in the air entering the 'fan chamber 3 from the lbeater chamber 2, is consequently verylsmall as compared wth the amount that would pass were this 'regulator 27 not used.

In previous mills of this general type,

.the o eration of the regulator 27 has'been varie by adjusting the regulator along shaft 4 toward or from the fixed conical ring 30. This of necessity involves stopping the mill and opening the same order to get at .the regulator 27 which is vcompletely en-.

closed by the mill housing.

According to the present invention, this adl justment of the retarding effect of the regulator, Aaxially of shaft 4.

. lator is obtained by leaving the regulator 27 in fixed position on the shaft-4, but moving the conical ring 30 toward or from the regu- The conical surface 3 0 is provided on the inner side of an annularl frame 31, .the cylindrical outer periphery of which fits snugly within a corresponding cylindrical passage 32, in 'the mill housing 33. Outlet opening` 23 is'provided inthe base of frame 31adjacent the smaller end of conical surface 30. A plurality, here shown as three, of diagonally arranged slots 34 are provided in the 'cylindrical peripheral surface of annular member 31, and suitably fixed lugs, such as the projecting ends 35 of screws 36, are engaged in these slots 34. The screws 36 may conveniently be mounted in the mill housing 33.'

It will. be noted that if the annular'member i 31 be rotated 'through a small arc, the lugs 35 and slots 34 4will functionv as cams or screwthreads,.to move the ring 31 to and fro axially of shaft 4, along the passage 32. To conveniently accomplish this movement y.of annular member 31, a lug 37 isprovided on this annular member which projects between the inner ends of a pair of adjusting screws-38, mounted in lugs 39 of the fixed mill housing 33. lly suitably adjusting the screws 38 which, are readily Yaccessible from outside ofthe mill, the lug 37 and consequent] the -ring 31 may be rotated through a sma lnarc, thus lmoving the conical surfacev 30 toward or from the-ends 29 of the blades 28 of the rotary regulator 27. Obviously, when the conical ring 30 is adjustedl toward the'left, Fig.' 1, that is, closer to lthe regulator 27, it willl be more dificult for the coarse materialto pass thereby without being thrown. out against theconical ring 30 fand thence back in to the beating zone of the mill, andthe fuel willbe pulverized more finely by reason ofits beingretained a'much longer time in the beater-chamber2. By ad- A.

j usting the conical ring 30 towards the right, Fig. 1, away from regulator 27, the pas-- sage of material thereby isf'facilitated, and

the fineness of the pulverized material correspondingly decreased. j

' It will be apparent that these adjustments may be made without dismantling the mill, and even without stopping the operation thereof. vByl properly proportioning .and positioning the slots 34 and the llugs 35 the longitudinal movement of ring 31 axially of shaft 4 may be so limited that it is impossible to bring the ring 30 into contact with the rotating blades 28 and hence there is no possibility' of injury to the apparatus even though the mill is in continuous operation. i

. We claim:

l. A. pulverizing mill comprising a beater chamber having an outlet for the pulverized material, a rotary regulator mount ed within the chamber adjacent the outlet, and means surrounding the regulator within the outlet and adjustable from outsidev mounted adjacent the outlet, and a ring member having a conicalv opening surrounding the regulator and adjustable toward or from same to vary the flow of material past the regulator.

4. In a pulverizing mill comprising a beater chamber having an outlet for the pulverized material, a regulator of fixed dimensions -positioned within the outlet for retarding the flow' of pulverized material through "the outlet, and means adjustable from outside the chamber for varying the effective size ofthe outlet with relation to the retarding regulator.

5. In a pulverizing mill comprising a beater chamber having an outletfor the gulverized material, a rotary regulator of Xed diameter positioned for rotation with in the outlet for retarding the flow of pulvelzed material through the outlet, and

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means vadjustable frvn .outside the chamber for varying the ar.. lar clearance between the rotary regulator and the surroundingy walls of the Outlet 6. #In a l,pul'verizing mill comprising a beater chamber having an outlet for the pulverized material, a rotary regulator mounted adjacent the outlet, a ring member mounted in the outlet and having a conical opening surrounding the regulator, and means for rotating the ring in the outlet and thereby moving same laterally toward or from the regulator.

7. In a pulverizing mill comprising a beater chamber having au out-let for the pulverized material, a rotary regulator mounted adjacent the outlet, a ring memberl mounted in the outlet and having a conical opening and surrounding the regulator, cooperating cam means on the ring and stationary mill-housing whereby rotary movement of the ring will cause the ring to be moved laterally toward or from the regulator, and means accessible from outside of the chamber for rotating the ring,

8. In a 'pulverizing mill comprising a beater chamber having an outlet for the pulverized material, a rotary regulator mounted adjacent the outlet, a ring member mounted in the outlet and having a conical opening surrounding the regulator, there being a plurality of inclined slots in the peripheral surface of the ring, and a Llll plurality of fixed lugs projecting into these slots, 'whereby a partiall rotary movement of the ring will cause a lateral movement thereof toward or from the regulator, and means accessible 4from outside vthe mill for rotating the ring.

9. A pulverizing mill comprising a beater chamber, a shaft vextending centrally therethrough, a pluralityof pulverizing 10. A pulverizing mill comprising `a beater chamber, a shaft extending centrally therethrough, a plurality of pulverizing hammers mounted on the shaft, the material to be pulverized being fed into one ortion of the chamber, the chamber having an outlet around the shaft at one end thereof,

means for withdrawing the pulverized material suspended in air through this outlet, a rotary regulator mounted on .the 'shaft adjacent the outlet, and a ring member surrounding the regulator and adjustable toward or from same to vary the retarding effect of the regulator.

rough this outi ll. A pulverizing mill comprising a beatl er chamber, a shaft extending centrally therethrough, a plurality of pulverizing hammers mounted on the shaft, the material to be pulverized being fed into one portion of the chamber, the chamber having an outlet around the shaft 'at one end thereof, means for withdrawing the pulverized. material suspended in air through this outlet, a rotary regulator mounted on the shaft adjacent the outlet, and a ring member having a conical opening surrounding the regulator and adjustable axially of the shaft to vary the retarding edect of the regulator.

JOE CRITES. WILLIAM H. VGEL.

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