US1503703A - Grinding mill for rocks, ores, and like material - Google Patents

Description

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' E. H. MOYLE GRINDING MILL FOR ROCKS, ORES, AND LIKE MATERIAL Filed June 1. 1921 2 Sheets-Sheet l w T/VVES s 5;;

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E. H. MOYLE GRINDING MILL FOR ROCKS, ORES, ME?) LIKE MATERIAL Filed June 1. 1921 2 Sheets-Sheet 3 W/T/VE5SES:

Patented Aug. 5, 13214.

barren EDWARD H. MOYLE, OF LOS ANGELES, CALIFORNIA.

GRINDING MILL FOR BOOKS,

Application filed June 1,

To all whom it may concern:

Be it known that I, EDWARD H. MoYLE, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a certain new and useful Improvement in Grinding Mills for Books, Ores, and like Material, of which the following is a specification.

This invention relates to grinding mills for reducing hard materials, such as ore, limerock, clinker, fertilizer or the like to a fine mesh product, and it has particular reference to that class and type of grinding mill more specifically described and claimed in my co-pending application for patent filed June 18th, 1919, Serial No. 305,113.

wherein I have described and illustrated a grinding mill involving the employment of balls and rollers in co-operative grinding with a rotor ring shoe and a die, the rotor ring shoe when in operation being eccentric to the axis of the grinding mill.

The present invention relates to a grinding mill constructed according to the same general principle, but embodying balls and rollers co-operatively acting with an unaxial rotor ring shoe, and by this arrangement the greatest efficiency in a pulverizing surface will be obtained as well as a saving in power when the mill is in operation.

Objects of this invention are to provide a device which will operate nearly in balance, requiring about the same amount of power to start the device as to operate; to provide a simple device made of the fewest number of parts to give a result; to provide a device which will readily disassociate a compact mass when starting; to provide a device in which a more direct and a greater wearing contact surface will be on the ore, rock or material to be pulverized; to provide a device for quickly unloading or discharging the product when it is pulverized, and finally to provide a device in which the grinding and discharging parts can be readily and quickly renewed.

lVit-h these and other objects in view, this invention consists of the features, and arrangement of parts, separately and in combination, described in connection with the accompanying drawings, and then more particularly pointed out in the claims.

In the drawing,

Fig. 1, is a side elevation of the grinding GEES, AND LIKE MATERIAL.

1921. Serial No. 474,077.

mill as assembled, when the rotor ring shoe and die are used cooperatively with balls, it is partly shown in section through the centre of drum, delivery tube, and discharge tube, the direct drive pulley being shown in section, the mechanical intake scoop in elevation, and the mechanical feed box in section, other details removed for clearness in description.

Fig. 2, is a sectional side elevation of the discharge tube shown in Figs. 1, 3 and 5, but drawn to a larger scale in order that my description of the discharge by this discharge tube may be more clearly understood.

Fig. 8, is a sectional detail in elevation through the centre of grinding mill, it shows the roll or rotor ring shoe with double conical friction and grinding rollers; this figure also shows the delivery tube and also the discharge tube projecting inwardly of the mill.

Fig. 4, is a sectional detail through the centre of grinding mill, showing the roll or rotor ring shoe supported by double conical friction rollers which are carried between the roller faces or tread of the roll or-rotor ring shoe, and the roll race or tread of the die.

Fig. 5, is a sectional detail in elevation through the centre of grinding mill showing the roll or rotor ring shoe having a ball race or tread adapted to suit balls. and having a plurality of balls, and also having a ball race or tread formed on the die by which the balls are carried. This detail also shows the ore feeding means to the balls, roll or rotor ring shoe and die, and also the elevating means consisting of the ribs or extension plates, and also the discharging means for unloading the pulver ized product from the ore, rock or material, which has been carried up or elevated by the said extension plates by which the ore may be discharged by the discharge tube which projects inwardly of the mill.

Fig. 6, is a vertical sectional detail through the centre of grinding mill and showing a roll or rotor ring shoe supported by a plurality of balls which are carried in the ball tread of die, the balls not being shown in section.

Fig. 7 is a side view of the roll or rotor ring shoe shown in Figs. 1, 5, and 6; it shows the feed and discharge openings at the sides, and the ribs or extension plates and pockets, for delivering the finely pulverized product, so that it can be carried out of the mill by means of the discharge tube.

In the different types of grinding mills now in use the working or grinding parts of some of them are very greatly out of balance, requiring a large excess amount of power to start the mill, over the amount of power required, when it has attained its proper'speed when in operation. So that a comparatively large engine is required in this case, which necessarily is more expensive in cost of installation and up-keep.

In starting up that type of grinding mill which is greatly out of balance, the torque strain is very great on its gudgeons and bearings, causing considerable break age. The gearing and belts, gudgeons and shafts, must necessarily be made of a larger and of a greater driving surface, in order that they will be durable and strong enough to start the mill in operation.

In the starting up of other grinding mills of a more uneven balance an electric motor is required having a very strong torque or pulling power said to amount to as much as 240 per cent excess torque action, and the motor is designed as such with the object in view of preventing the burning out of the armature when starting up the mill. It will be seen that with an unaxial roll shoe being nearly in balance with the cylinder of the mill, that this condition is avoided, and so allowing of a motor of any well known standard design.

The grinding parts such as balls and the like which are within certain types of grinding mills, when once operated on the grinding of ores, rock or material and, when grinding wet, are exceedingly hard to start, after the load or charge of ore is once set, by reason of stoppage, so that, the balls or like grinding parts with the intermixed material, causes an excessive torque action, and considerable breakage to that type of mill, as well as excess power, and over plus bearing surfaces necessary for the transmission.

In that other type of over-balanced grinding mill using a multiplicity of balls of various sizes, the wear is naturally towards excess, by reason of the greater comparative weight of the ball, over that of the ore, rock or material, as a certain point of the convex surface of each of the balls, is always opposing or contacting with each other, and so Wearing itself with the opposing ball, thereby giving a maximum of wear and loss of metal, in the crushing and pulverizing of the ore or other material.

This invention relates to a compara tively high speed grinding mill, in which a roll or rotor ring shoe with its complement of balls or rolls or a corresponding die, or, a plurality of rolls or rotor ring shoes with their complement of balls or rolls or a plurality of corresponding dies, are used within the grinding mill, so arranged that the ore rock or material may be fed into the interior of the mill to and between the roll or rotor ring shoe or shoes, and its complement of rolls or balls and corresponding die or dies and then, when so pulverized to be quickly discharged for further treatment.

This invention also relates to that type of mill which is nearly in balance, as it will be seen, that the centre or axis of the roll or rotor ring shoe is nearly on, or in relation to, the operating centre of drum, by which the die is carried, so that this eliminates the unnecessary torque which causes the breakage, as is so common in other mills, when starting, and then in operation.

It will also be seen that the roll or rotor ring shoe when slightly in movement, when starting or operating the mill, will act as an agitator or stirrer, and at once relieving the charge from its quiescent and compact state, into a live and disassociable state, when the mill is pulverizing wet.

It will also be seen that, in the feeding and pulverizing of ores in this type of mill, whether pulverizing wet or dry, that I obtain a maximum wearing or crushing surface on the ore, rock or material, by reason of the number of pulverizing surfaces obtained by the use of balls or rolls in conjunction with the rotor ring shoe and die, when the mill is in rotation or operation.

It will be also seen that I have removed, in the internal arrangement, all pins and fixtures which wear the same as the rest of the grinding parts, which require a great expense for renewal, so that the internal arrangement of the working and wearing parts in my mill are so simple that they can be renewed at an economic expense.

In this invention I have also shown. a means by which a relative and specific size can be raised or elevated, from the product in suspension within the mill, by its own mechanical means, when in operation and grinding the ore, rock or other material. The ore being ground by the surfaces of the roll or rotor ring shoe or a plurality of them, with balls or rolls as may be selected, and the surfaces of the die or plurality of dies, and the crushed or pulver ized product which is held in suspension within the roll or rotor ring shoe, is elevated or carried up by the vanes, pockets or the like, which are located in or on the interior of the concave surface of roll, or rotor ring shoe, and this product so raised, then unloaded or deposited, on, or in the helical discharge screw or tube of mill, to

be quickly carried out of the mill, and conveyed to any type of screens, hydraulic classifiers, tanks or the like, for a treatment which might be necessary.

The present invention consists of a cylinder or drum, formed by heads 1 and 2 and shell 3 and 4, fastened by bolts a, and 0.

To the shell 3 and 4 is fastened a ring die 5 or 5 as the case may be and to corre spond with either rolls or balls, the die to be of a good wearing material and preferably made in sections, and fastened to shell 3 and 1 as the case may be by bolts or any other well known means. The side liners 7 made of a good wearing material are preferably made in sections and can be fastened to heads 1 and 2 by bolts or they can be made of a reasonably good fit and so held in place by die 5 or die 5 as the case may be.

011 the tubular extensions 9 and 10 of heads 1 and 2, respectively, bearings 9 and 10 are turned to suit bearing blocks 11 and 12, respectively, these bearing blocks may be of the ball and socket type as shown at 13, or of any other adaptable type, and may have an extended base plate 11 and 12 as shown. On the tubular extension 10, is fastened a circular discharge lip 14;, by bolts 15. A discharge tube 16 having in its interior a circular projection or spiral flight 17, formed to act as a conveyor and used to quickly convey and discharge or unload the pulverized ore, rock or other material from the mill after pulverization. It its removably fastened to tubular extension 10 of head 2 by a circular flange 18 erected around the exterior of discharge tube 16 and having holes therein so that it may engage with bolts 15, and so be rigidly held in place at the end and between tubular extension 10 and discharge lip 14: by said bolts 15.

The projection or spiral flight 17 which constitutes the conveyor can be made of a direction or hand which is suitable to the operating direction of the mill. As the mill shown in Fig. 1 is arranged to operate against the hands of a watch, the projections or spiral flights 17 could however be arranged left-hand if necessary in order that the pulverized product would be discharged outwardly of the mill.

On the tubular extension 9 of head 1 is arranged and fastened a driving pulley 18 of a suitable design for driving the mill; this driving pulley, however, could be replaced with a driving gear to be driven by a pinion, by which the power could be con' nected direct; (the driving gear and pinion being not shown).

The bearing blocks 11 and 12 can be fastened to plates 11 and 12, and the plates 11 and 12 fastened to the foundation by bolts.

The mechanical scoop or spiral feeder 26- made with .one, two, three, or more intake openings, is fastened 011 the tubular extension 9 of head 1 by bolts 21, and in practically the same manner as discharge lip 14 is fastened on the tubular extension 10.

The delivery tube'22 having in its llltGIlUi a circular projection or spiral flight formed as a conveyor, and is used to quickly convey the ore rock or material to the interior of the mill to be pulverized. This delivery tube 22 is also removably fastened to and between the tubular extension 9 of head 1 and mechanical scoop 20, by bolts 21, in the same manner as the discharge tube 16 is fastened. A suitable delivery box 2% is placed for the receiving of the coarse ore rock or material to be pulverized, and so formed, that the mechanical scoop or spiral feeder can be easily and quickly loaded with the ore rock or material, to be delivered to the delivery tube 22, having the proper conveyor flights 23 therein of a proper hand or helix, that the crushed rock or material can be quickly delivered to the interior of the grinding mill for necessary pulverization.

l/Vithin the drum or cylinder of the grinding mill comprising the heads 1 and 2, shell 3 and 4, and ring die 5 or 5, as the case may be, is placed a roll or rotor ring shoe 25 or 25, as the case may be, which is unaxial, or, in other words, without a stationary axis; this roll or rotor ring shoe 25 or 25 having an outer grinding face or periphery 57 or 61 which is of a less grinding surface or circumference than the circumference or internal periphery 58 or 62, as the case may be, of the grinding die 5 or 5.

To place the roll or rot-or rin shoe 25 or 25 together and in the mill wit the double conical rolls 51 or the balls 54:, as the case may be, bolts (4, 5 and c are first removed so that shell 3 can be lifted up and removed by means of block-tackle or any other lifting means can be applied, by engaging same with lifting eye 28 of shell 3, and then is inserted the parts of the ring die 5 or 5, and which may be bolted if necessary to shell 3 and 1-. The ring dies 5" or 5 could be fastened in any other well known manner, or they could be fastened by interlocking the dies, when made in sections.

As the external or outside diameter of the roll 25 or 25. is less than the internal diameter of ring die 5 and 5, it will be seen that the centers are unlike or opposed to each other as shown at 30 and 31; that shown at 30 being the center of the surface of ring die 5 or 5, to the shell or cylinder, while that shown. at 31 being the unaxial center, or the center of the roll or rotor ring shoe 25 or 25.

In general practice these centers 30 and 31 may be arranged comparatively closer or nearer to each other than shown, should it be necessary.

Feed openings 55* when using the double conical rolls or 55 when using the balls, are formed from the inner surface of the roll or rotor ring shoe as shown to the outer surface as shown in Fig. 3 and Fig. 5; these openings are made to suit the condition of operation, and can be made either straight or curved, the intent of these openings being both to feed and discharge the crushed material.

I have shown one type of feed opening in Fig. 3 and another type of feed opening in Fig. 5; this feed opening is used to distribute the ore rock or material to the contact or pulverizing surface of the roll or rot-or ring shoe 25 or 25 and the die surface 5 or 5, so that the ore can be ulverized when the mill is in operation. 8 openings may be used to accomplish the same result, so that, I do not particularly limit myself to a specific form of feed opening.

The center of gravity of grinding mill with the ring die 5 or 5, and of the roll or rotor ring shoe 25 or 25 will be so nearly equal, that the power necessary to start this type of mill, will be very nearly the same as when in operation; it being seen, that while there is considerable weight in the roll or rotor ring shoe 25 or 25, that nearly onehalf of that weight is practically at the top, or, on the opposite side of the center line 30 of the mill.

It will also be seen that with a slight circular movement of the mill, that the ore rock or material which is within, even if wet, will immediately become agitated thereby, so that the torque action on the bearings as well as the whole mill is limited or at a minimum. A heavy torque is generally the cause of breakage when starting and operating other mills which are excessively unbalanced.

The roll or rotor ring shoe 25 or 25 could be free from feed openings 55 and 55 if found necessary when operating on certain types of material, as said material could be fed along the sides of the roll or rotor ring shoe and then into the balls or double conical rolls to be pulverized.

In Figs. 1, 3 and 5, I have shown a single roll or rotor ring shoe, and a single die, but I do not wish to confine myself to a single roll or rotor ring shoe, or a single die, as a plurality or multiplicity of these rolls or rotor ring shoes could be used side by side if necessary, and with a plurality or multiplicity of dies, rolls or balls, and in the same manner as before described.

'ther types of feed' As the outer circumference 57 of the ball surfaces by reason of bein of a difierent circumference will constanty rub on the ore rock or other material, and so speed the pulverization, thereby giving a subsequent large capacity to the mill.

As the mill in its operation will be almost in balance it will be seen that it can be operated at a high speed and at a considerably greater capacity in a. given time than that of a mill which is greatly out of balance, as is the ordinary type of ball mills.

In Figs. 1, 3, and 5, I have shown a roll or rotor ring shoe, arranged and adapted to elevate the pulverized material, or, for carrying up the finely pulverized product, and discharging the same, upon, and into the discharge tube 16, which is so fitted with an internal projection, of a design suitable for conveying the finely crushed product out of the mill, as I have shown at 16'', 41, 42, 43 and 43 The finely pulverized product when discharged upon this internal projection of the discharge tube 16, will fall in a diametrically or helically slotted way 42, and be sodeposited upon the inner surface of this helical screw conveyor, so arranged to act as a discharge launder as at 43, and the pulverized product carried quickly into the discharge tube 16, and at its} point of connection which is better shown at 44, of Figs. 1, 2, 3, and 5.

The tube 16 being auxiliary to the dis charge tube 16 is used as a carrier for the T-shaped internal launder or helical screw conveyor as shown at 41 and 43, with helical openings or slotted way as at 42, and with a turned-up flange as shown at 43*, which acts as a retainer when conveying the pulverized product to discharge tube 16, as shown in Fig. 2; the tube 16 could also be perforated if found necessary, so that the pulverized product would be very quickly delivered to the discharge tube 16, and it would also fulfil the office of carrier or conveyor of the pulverized product into the discharge tube 16.

In the placingof the roll or rotor ring shoe, or, when placing its renewals, and when the delivery tube 22 and discharge tube 16 project inwardly as shown in Figs. 1, 3. and 5, it will be necessary that the circular discharge lip 14 is firstly removed,

and then the discharge tube 16 is withdrawn outwardly and sufliciently for the removal of the old roll or rotor ring shoe and the replacing of the new roll or rotor ring shoe, and its balls or rolls.

The delivery tube 22 could also project inwardly and within the roll or rotor ring shoe 25 or 25, if it should be found necessary, and it also could be removed when found necessary by so removing the mechanical scoop or spiral feeder 20 from'the tubular extension 9, in the same manner as the discharge tube 16 is withdrawn or removed.

In Figures 1 and 5 I have shown the roll, or-rotor ring shoe 25 having on its inner surface lifting vanes, projections, flights or extensions, as at 59, and being so arranged to constitute a bucket or receptacle, for the delivery of the finely crushed product, up. and above the tubular opening 48, within which the discharge tube 16 and delivery tube 22 is placed, so that this bucket or receptacle will carry up the finely pulverized material, and so dump or discharge the same at a proper position, or angle and upon the projecting end of discharge tube 16, to be so carried outwardly of the mill as I have previously described.

These buckets, or receptacles can be made of various shapes and designs to accomplish the purpose heretofore explained, and I do not limit myself to these shapes or designs, as other practical shapes could also be used to suit the condition and give the same result.

In Figure 3 I illustrate and show a roll or rotor ring shoe as at 25 and the die 5 of the mill, with a plurality of double conical rollers 51 arranged therebetween, and which, and in conjunction with the roll or rotor ring shoe 25 and die 5 as shown in Fig. 3, comprise the mechanism by which the ore rock or material is pulverized with less friction. I have shown the unaxial center 31, or, without a stationary axis of the roll or rotor ring shoe 25*, as before mentioned in Figures 4L and 6 as somewhat magnified, in order that it may be more clearly understood, but, this center may be placed as nearly as practicable to the center of mill 30, as it would be found necessary, for the reason that, as the internal wear takes place, that the two centers will somewhat increase their distance from each other As shown in Fig. 1, the ore is carried into the mill in the ordinary manner, through, and by means of the delivery tube 22, and it then passes into the interior of the mill or rotor ring shoe 25 and from there through feed and discharge openings 55 at each side of the roll, and then, down the in cline clearance passage 56, to and between the plurality of balls 54:, and the ball face or tread 57 of the roll or rotor ring shoe 25, and to the ball race or tread 58 of the die 5 to be pulverized.

The ribs or extension plates 59 with bucket grooves 60 within the roll or rotor ring shoe 25, are as I have previously explained, for the carrying and delivery of the finely pulverized product, by and to the discharge tube 16, which may be located as shown, or projected inwardly of the mill, as I have also shown in Figures 1, 5 and 7 The double conical rollers 51 and the balls 5 1, or any other shaped rollers, or like friction and pulverizing devices, some of which I have shown or described, could be placed within the mill, and in the same manner, as the roll or rotor ring shoe 25* or 25 are placed, or, a special feed hole, with its cover and appurtenances, could be arranged on either heads 1 and 2, or on the shell 3 and 4: for the same purpose.

Ore rock or material is fed in the same mannerto the roll or rotor ring shoe 25 of Fig. 3 by and through the delivery tube 22, then through feed openings 55*, or side openings 55 to be pulverized between the double conical rollers 51 and the roll race or tread. 61 of the roll or rotor ring shoe 25 and to the ,roll race or tread 62 of the roll die 5.

It is to be understood, that the construction of which I have illustrated and disclosed herein, is illustrative merely, and that I do not restrict myself as the invention may be embodied into other forms, for example, the roll or rotor ring shoe being unaxial, can be changed into various shapes, in order that the various ore, rock or material may be expeditiously pulverized and elevated for a quick discharge, and with a die suitable. The discharge tube could also have many other and various changes in form and construction. In the drawings I have shown a single die 5 or 5 with its appurtenances, but this mill could be arranged for a plurality of dies 5 or 5 and with a plurality of rolls or rotor ring shoes and their appurtenances. All without departing from the spirit of this invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In a grinding mill, a shell with removably fastened heads having hollow bearing extensions, means in one of the hollow bearing extensions for feeding the ore to be pulverized, and means in the other of the hollow bearing extensions arranged for discharging the pulverized material, a removable grinding die fastened within the shell, a freely rotating roll or rotor ring shoe having grindin means around its out-er surface, a freeI rotating grinding means arranged between the surface of the grinding die and the outer grinding surface of the freely rotating roll or rotor ring shoe, and means for revolving the shell and grinding die and its coacting appurtenances.

2. In a grinding mill, a shell with removably fastened heads having hollow bearing extensions, one of the extensions having means therein for feeding the ore to be pulverized, the other hollow bearing extension having removable discharging means theresurface of the grinding die, a freely rotating roll or rotor ring shoe having an outer grinding surface, arranged to coact with the freely rotating grinding means which is arranged on and around the grinding surface of the die, the freely rotating grinding means arranged on and around the grinding surface of the die and to freely rotate with, and around the grinding surface of the freely rotating roll or rotorring shoe, means for revolving the grinding die which revolves the freely rotating grinding means and, which in turn revolve the freely rotating roll or rotor ring shoe.

3. In a grinding mill, the combination of a cylinder having a grinding die therein, a freely rotating grinding means arranged upon the grinding surface of the grinding die, a freely rotating rotor rin shoe arrangeduponthe grinding means which coacts with the grinding surface of the grinding die, the freely rotating grinding means encircling the grinding surface of the freely rotating rotor ring shoe, means for feeding material to be pulverized to the grinding die, within the cylinder, means within the grinding mill for discharging the pulverized material, and means for supporting and re volving the cylinder of the grinding mill.

4L. A grinding mill comprising a cylinder with a grinding die therein, freely rotating grinding means arranged upon the grinding surface of the grinding die, a loose freely rotating roll having an outer grinding surface and arranged upon the freely rotating grinding means which is arranged upon the rinding surface of the grindin die, the grinding means which is arrangec upon the grindin surface of the grinding die, to surround the outer grinding surface of the freely rotating roll, means in the grinding mill for feeding the material to the freely rotating grinding means, means extending within the grinding mill for quickly conveying out and discharging e pulverized material, and means for operating the grinding mill.

5. The combination of a shell containing a grinding die adapted for a plurality of grinding means, a plurality of grinding means placed upon the die, a freely rotating unaxial roll placed Within the shell and upon the plurality of grinding means and so adapted that the plurality of grinding means will travel around and upon the freely rotating unaxial roll, and means for revolving the shell and the grinding die.

6. The combination of a shell containing a grinding die adapted for a grinding means, a plurality of grinding means placed upon the die, a freely rotating unaXial roll placed upon the plurality of grinding means and arranged to, carry the plurality of grinding means around and upon the outer surface of the freely rotating unaxial roll, means for feeding material to the grinding means, means for receiving, conveying, and discharging the pulverized material, and means for revolving the shell and the die.

7. In a grinding mill, the combination of a cylinder having a ring die therein, tubular trunnions on said cylinder, a freely rotating ring shoe having a contact surface for engaging with the frictionless pulverizing means and having openings through its periphery, a frictionless pulverizing means engaging with the contact surface of the freely rotating ring shoe and the contact surface of the ring die, means for feeding material into said cylinder through one of said trunnions and means extending into said cylinder and in the other trunnion for conveying and discharging the pulverized material from the cylinder, and means for revolving the cylinder.

In testimony whereof I affix my signature in the presence of two witnesses.

EDWARD H. MOYLE. Witnesses C. B. CRONER, JAoon FORD.

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