US3211387A - Grinding mill lining and control of the wear thereof - Google Patents

Grinding mill lining and control of the wear thereof Download PDF

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Publication number
US3211387A
US3211387A US224075A US22407562A US3211387A US 3211387 A US3211387 A US 3211387A US 224075 A US224075 A US 224075A US 22407562 A US22407562 A US 22407562A US 3211387 A US3211387 A US 3211387A
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Prior art keywords
mill
bars
lifter
lifter bars
height
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US224075A
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Robert J Russell
Hardinge Harlowe
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Beazer East Inc
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Koppers Co Inc
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Priority to US224075A priority Critical patent/US3211387A/en
Priority to GB34007/63A priority patent/GB999521A/en
Priority to DEH50236A priority patent/DE1227315B/de
Priority to FR947220A priority patent/FR1382971A/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • This invention pertains to grinding mills and, more particularly, to the lining of various kinds of grinding mills, the invention principally being concerned with means and arrangements, as well as a method, for controlling the wear of the mill lining, especially to lessen the cost of upkeep thereof, and also lengthen the life of the lining means of the mill.
  • the invention pertains to lining and material lifting means in various kinds of grinding mills, such as, for example, ball mills, pebble mills, rod mills, and, more particularly, grinding mills arranged to comminute friable material autogenously by using various sizes of the material as its own grinding media while being tumbled within the mill.
  • grinding mills such as, for example, ball mills, pebble mills, rod mills, and, more particularly, grinding mills arranged to comminute friable material autogenously by using various sizes of the material as its own grinding media while being tumbled within the mill.
  • Ball, pebble and rod mills are of the rotating type, and the length thereof in an axial direction is generally either equal to or substantially greater than the diameter of the mill.
  • the term pebble mill also includes that type of autogenous tumbling mill wherein selected, larger fragments or pebbles are used as grinding media to reduce the so-called feed size which is considerably smaller. For example, if a mesh feed is to be ground in such a mill, then pebbles of 1 to 3" would be selected, or if, for example, the feed size is of the order of A to 1" maximum size, then 5" to 7" size pebbles or fragments of the same material would be employed.
  • the size ranges selected here are examples only and are subject to wide variation, depending upon conditions and the material being ground.
  • the construction usually comprises a metallic shell of suitable thickness to form a rigid housing, but the nature of the metallic shell, even though of appreciable thickness, is such that the shell per se is not capable of sustaining the abrasion and impact normally occurring Within the mill as the result of the material tumbling therein, and particularly if the active grinding media comprises metallic balls, rods, or tubes, or non-metallic pebbles, or the like, formed from flint and other hard substances.
  • the active grinding media comprises metallic balls, rods, or tubes, or non-metallic pebbles, or the like, formed from flint and other hard substances.
  • the material itself is relatively hard and thereby subjects the inner surface of the mill to substantial abrasion and impact.
  • the wedge bars both on the peripheral portions, as well as the ends of mills of this type, for the double function of not only connecting the liner elements to the shell of the mill, but also acting as lifting means.
  • the interior of the mill is provided with substantially parallel lifter bars projecting radially toward the axis of the mill and parallel thereto, said lifter bars being spaced circumferentially around the interior of the peripheral portion of the mill.
  • the lifter bars comprise projections which are engaged by the material being tumbled within the mill, as well as the grinding means or media when employed, and tend to hold segments of the material within the mill substantially stationary relative to the interior of the mill until the material reaches a certain height within the mill when gravity overcomes the holding effect of the lifter means and permits the material to tumble or cascade over itself within the mill, simultaneously effecting grinding action.
  • the ends of the mill are provided with radially extending lifter bars which, in addition to their lifting function, likewise frequently serve to wedge or otherwise secure the liner sections or segments upon the ends in their operative position so that, at all times, all portions of the shell of the mill are protected against abrasion and wear.
  • wedge bars both those connected to the peripheral surface of the mills, as well as the ends thereof, which are of a uniform height or radial dimension, for example, in a radial direction inwardly toward the axis from the inner surface of the liner elements. It is obvious that as the mills rotate, such wedge and lifter bars will be subjected to substantial abrasion and impact, substantially uniformly, whereby all of such bars t end to wear away not only at the edges, thereof, but generally along the outermost surfaces, whereby the radial dimension of the bars gradually is reduced until their lifting ability has diminished to the point where they must be replaced for further eflicient operation of the mill.
  • Another object of the present invention is to provide rotatable tumbling mills of the type referred to with several sizes of lifter bars respectively of medium and high radial dimensions or heights, for example, these radial bars of different heights being arranged successively around the periphery of the mill, as well as on the ends thereof if lifter bars are utilized on the ends of the mill, whereby as the lifter bars progressively wear and the radial dimension or heights thereof gradually are reduced so that the intermediate bars become low and the high bars become intermediate in height, it will only be necessary to replace the worn low bars with relatively high bars, thereby resulting in a minimum of waste scrap being expended in the form of such worn lifter bars, and, in addition, the replacement time is substantially reduced, but, more importantly, during the operation of the mill, the relative dimensions of the lifter bars with respect to the liner elements therebetween are maintained much more constant with respect to each other than occurs in mills where the lifter bars are all substantially of the same height.
  • a further object of the invention is to minimize wear upon the lining means of the mill by reducing the sliding effect due to the provision of the aforementioned types of successively different heights of lifter bars, which result at all times in at least alternate lifter bars being relatively high in a radial direction, as compared with all of the lifter bars wearing simultaneously to substantially even radial heights, as is the common experience in conventional mills of this type.
  • Still another object of the invention is to enhance the efficiency, particularly of autogenous grinding mills, wherein maintenance of substantially constant interior contour within the mill is a prime requisite to the achieving of maximum grinding efficiency due to the fact that in mills of this type, the lifting action of various size ranges is a very important factor among all of the various factors which have to be coordinated in order to achieve maximum grindiing efficiency in this type of mill, and the maintenance of these factors substantially constant, in relation to the various components comprising the contour, eliminates one of the principal variables in autogenous grinding mills in which the lifter bars are substantially all of the same height and uniformly wear during operation of the mill so as gradually to decrease the lifting effect thereof.
  • Another object is to test different liner contours to obtain optimum operation, and then employ means and methods to maintain essentially a constant contour and grinding efficiency, taking into consideration progressive wear.
  • FIG. 1 is a side elevation, partly broken away, of an exemplary autogenous grinding mill in which the ends thereof are of the conical type and within which mill the liner means and lifter bars are arranged in accordance with the present invention.
  • FIG. 2 is view similar to FIG. 1, but illustrating another embodiment of autogenous grinding mill in which the ends are substantially parallel, but within which mill the lining and lifter bars are arranged in accordance with the present invention.
  • FIG. 3 is a side elevation, partly broken away, of an elongated type of mill, such as commonly found in ball, pebble and rod mills, said mill being adapted for continuous feed and discharge of mineral products and the interior of the mill being provided with lining and lifter means arranged in accordance with the present invention.
  • FIG. 4 is a transverse sectional view of the mill shown in FIG. 3, as seen on the line 44 of said figure.
  • FIG. 5 is a vertical sectional view through the mill illustrated in FIG. 1, and illustrating in an exemplary manner the disposition of material within the mill while undergoing reduction so as to show the cascading and tumbling action to which the contents of the mill are subjected, a similar effect also occurring in the mill shown in FIG. 2.
  • FIGS. 6, 7 and 8 respectively are progressive views of similar transverse segmental sections of peripheral portions of the various mills illustrated in FIGS. 1-3, and in which views the liner elements and transverse lifter bars are shown progressively in relatively new, worn, and partially replaced or restored conditions, in accordance with the principles of the present invention.
  • FIGS. 9, 10 and 11 respectively are sectional views similar to FIG. 6 and individually illustrating different shapes and kinds of liner elements and transverse lifter bars employing the principles of the present invention.
  • FIG. 12 is a fragmentary sectional view showing details of a preferred type of lifter bar mounting structure.
  • the present invention is particularly of importance to autogenous grinding mill for purposes of maintaining substantially constant contour shape on the interior of the mill so as to afford substantially constant lifting effects
  • the majority of the views shown in the drawings illustrate various types of autogenous mills in which the axial length of the interior of the mill particularly is substantially less than the diameter of the interior of the mill within which the grinding takes place autogenously.
  • Such so-called narrow mills are highly effective to accomplish autogenous grinding of run-of-mine material and operation of the mill without requiring any substantial adjustment over long periods of time to produce optimum grinding efficiency is possible, once the optimum grinding conditions have been established.
  • a mill with a relatively long drum, compared to the diameter may also be employed for grinding run-of-mine material autogenously.
  • Autogenous grinding comprises using the material itself which is undergoing reduction as its own grinding media.
  • Autogenous grinding particularly is effective for purposes of handling run-of-mine material in which substantial ranges of relatively coarse, medium and fine sizes of material are included.
  • the larger size ranges serve somewhat as pebbles or grinding media to further reduce the intermediate and finer size ranges, but, in turn, the larger or coarser size ranges likewise gradually are reduced in size.
  • the use of metal balls or like media intermixed with the charge is also contemplated under certain conditions.
  • the lifting effect to which the material is subjected is of importance in the operation of an autogenous grinding mill.
  • the peripheral portion of the shell extends between the conical inlet end 12 and the conical discharge end 14.
  • Suitable hollow trunnions 16 and 18 support the mill rotatably in conventional bearings, not shown, and respectively serve as inlet and exit means for the mill.
  • a stationary feed chute 20 extends through the entrance trunnion 16, while an exitcone 22 extends through the exit trunnion 18.
  • Appropriate drive means serve to rotate the mill at required speeds, as determined for optimum grinding efliciency of the mill.
  • the interior of the mill, adjacent the conical end 12, is provided with liner segments 24 of hard, wear-resistant material, the peripheral edges of such liner segments preferably being shaped or slightly spaced so as to receive therebetween radial wedge and lifter bars 26 and 28, respectively of diiferent heights.
  • the bars 26 are considered, for example, to be of intermediate or medium height, while the bars 28 are considered to be high bars, for purposes of describing the present invention.
  • Conventional bolts secure the lifter bars and liner segments to the end 12 of the mill shell.
  • the peripheral portion 10 of the mill shell likewise, is provided with curved liner segments 30 and 32, which have inner surfaces sloping toward each other toward the center of the mill, for purposes of eflecting lateral movement of material which engages the same, in an axial direction within the mill.
  • Different heights of transverse wedge and lifter bars 34 and 36, respectively of medium height and high bars extend between the edges of the liner segments 30 and 32 and are secured to the mill shell by conventional T-shaped heads or wedge bolts 38, shown, for example, in FIGS. 1 and 12.
  • the circumferential spacing of the medium and high transverse lifter bars 34 and 36 is shown in exemplary manner in FIG. 5, the curved shape of liner segments 32 also being illustrated therein, and it will be understood that segments 30 are similarly curved.
  • the alternate arrangement of relatively high and low transverse lifter bars likewise is shown advantageously in FIG. 5.
  • FIG. 5 primarily is an interior view of the exit end 14 of the mill and said exit end includes screening means which preferably comprise segmental grate sections 40.
  • the ends of the sections of the grate 40 are preferably spaced circumferentially to receive therebetween the radial lifter bar sections 42 and 44, which respectively are of medium height and high bars, as best shown in FIG. 1, and secure the screening means to the exit end of the mill.
  • the grate sections are secured by appropriate bolts 46 to the shell end 14.
  • An annular discharge space 48 of appreciable depth in axial direction is formed between the grate 40 and the end 14 of the mill shell for purposes of receiving the relatively fine and medium size ranges of material discharged through the openings in the screening means comprising said grate sections. Also disposed within the space 48 are radially extending and circumferentially spaced blades 50 comprising lifters, which carry the material upward until gravity permits the same to fall against the conical end 52 of the mill which causes it to be discharged through the exit cone 22 and deflects the falling material axially outward into cone 22 for discharge from the mill.
  • Additional means also are provided within the mill shown in FIGS. 1 and 5 which are engaged by the falling and tumbling material and comprise annular deflecting rings 54 and 56, these serving to effect desired transverse movement of various size ranges of the material within the mill in an axial direction.
  • the conical arrangement of the liner segments 24 and grate sections 40, as well as the radial bars extending thereacross also comprise deflecting means which effect transverse movement of the material, whereby it will be seen that a very substantial amount of abrasion and impact is imposed upon the liner segments and the lifter bars, both radial and transverse, as a result of the autogenous grinding of the material being treated within this type of mill.
  • FIG. 6 an exemplary segmental section of the peripheral portion shown in FIGS. 1 and S is illustrated on a larger scale than in said figure.
  • the representation in FIG. 6 simulates an exemplary condition of the mill when the peripheral liner 32 and the medium height and high lifter bars 34 and 36 are substantially in new condition. After a period of wear, the condition of this same exemplary contour shape becomes as illustrated in FIG. 7, in which the initially high lifter bars now are indicated 36, whereas the initially medium height bars have been indicated 34. It is apparent therefore that the worn high bars 36 are substantially, for example, the same height as the new medium height bar 34 shown in FIG. 6, while the worn medium height lifter bar 34' of FIG. 7 clearly is ready for replacement, because its lifting ability in this condition is practically nil.
  • the high lifter bars 36 After the initially medium high lifter bars 34 are worn out and have been replaced, the only sized bar which need be obtained thereon for replacement are the high lifter bars 36.
  • a similar wear and replacement sequence as described for the mill periphery occurs and is applicable to both mill ends, including the bars holding the mill grate.
  • FIGS. 2 and 3 examples of these respectively are illustrated in FIGS. 2 and 3.
  • the mill shown in FIG. 2 is an autogenous mill, and aside from a few details which are peculiar to the autogenous grinding function per se, the mill shown in FIG. 2 is equivalent to that shown in FIG. 1, as far as the present invention is concerned, and comparable elements of the mill shown in FIG. 2 have been given the same reference characters as those in FIG. 1, except that a prime has been added to each of the numerals in FIG. 2 where the numerals designate corresponding or equivalent elements.
  • the principal difference between the mill shown in FIG. 2 over that shown in FIG. 1 is in regard to the extent of the grate 40', which, as will be seen by comparing the same with the grate 40 in FIG. 1, is spaced at its outer periphery from the interior of the peripheral portion 10' of the mill. Also, the ends 12' and 14 are substantially parallel to each other, and said mill also has an annular expanded zone 66, within which material undergoing reduction can expand during the grinding operation of the mill, and thereby, under certain circumstances, enhance the autogenous grinding of the material.
  • the lifter bars and the liner sections of the mill in FIG. 2 are subjected to extensive impact and abrasion, but, by employing the invention described in detail relative to the mill shown in FIGS. 1 and 5 with respect to the use of alternate lifter bars of different heights, the contour of the interior of the mill shown in FIG. 2 remains substantially constant, for the same reasons as explained above with regard to the mill specifically shown in FIGS. 1 and 5.
  • an additional annular deflecting ring 68 in the mill shown in FIG. 2 which is operable to effect a lateral movement of the material in the mill, and also serves to protect the screening diaphragm comprising grate sections 40' from excessive abrasion through contact by the material moving within the grinding zone of the mill.
  • the elongated type mill shown in FIG. 3 is substantially more simple than the autogenous grinding mill shown respectively in FIGS. 1 and 5 and FIG. 2.
  • the mill 70 may, for example, be a rod, ball or pebble mill, or the like, including that type of autogenous mill utilizing relatively coarse pieces of the same material as that fed in finer unfinished sizes thereto. While not generally as efiicient or as practical as the type of mills shown in FIGS. 1 and 2, this mill shape can also be employed to handle run-of-mine material the same as that type illustrated in FIGS. 1 and 2, and this invention contemplates the use of the same in this manner when considered advisable to do so.
  • the length of the mill is usually substantially greater than the diameter thereof.
  • the mill 70 is rotatably supported upon trunnions 72 and 74 at opposite ends thereof, these respectively being entrance and exit means as well and, in this particular exemplary illustration of the mill, a grate 76 is provided adjacent the exit end of the mill to size the material being discharged therefrom.
  • the principal items of interest comprise the peripheral liner segments 78, which extend between the opposite ends of the mill and the alternate longitudinally extending high lifter bars 80 and medium height lifter bars 82. If desired, the ends of the mill 70 also may be provided alternately with high and medium height lifter bars, Further, the longitudinally extending lifter bars 80 and 82 may be employed to retain, in operative position against the mill 70, the peripheral liner segments 78.
  • lifter bars 80 and 82 which will be subjected to the primary impact and abrasion type of wear, as distinguished from any other lifter bars within the mill, such as those possibly on the ends thereof, in addition, of course, to the peripheral liner segments 78, which, likewise, are subjected to substantial impact and abrasion type of wear.
  • the lifter bars 34 and 36 shown in transverse section in FIGS. 58 preferably are each of a composite or twopart construction, exemplary details of which are shown in FIG. 12 on a larger scale than in said preceding figures.
  • the upper or wear portions are separable from the wedge bar or root portions 83.
  • the opposite sides of the wedge bars 83 respectively engage adjacent and complementary edges of the liner plate segments 30 and 32.
  • wedge bolts 38 extend through both the upper portions 34 and 36 and wedge bars 83 of each composite lifter bar, as well as through the shell plate 10, to secure all of said items assembled in operative position.
  • This composite lifter bar construction is of particular advantage relative to the present invention in that it minimizes waste when discarding worn upper portions of the lifter bars since the wedge bars 83 usually are in such condition that the new replacement upper portions of the lifter bars will fit the upper surfaces of the wedge bars 83.
  • Another advantage lies in the fact that by letting the wedge 'bars 83 remain in place while replacing the worn upper portions 34 and 36, the liner plate segments are not disturbed, whereby overall elapsed time for such replacement is minimized.
  • This aspect of the invention also is applicable to the embodiments shown in all other figures of the drawings, if desired.
  • the lifter bars 30 and 82, as well as the peripheral liner segment 78 can have the life thereof substantially extended over the present practice where, in mills of this type, lifter bars of substantially the same height now are employed.
  • the relative heights of the longitudinally extending lifter bars 80 and 82 of the mill shown in FIG. 3 can best be appreciated from the sectional view shown in FIG. 4, which is taken on the line 4-4 of FIG. 3.
  • the exemplary thickness of the peripheral liner segments 78 likewise, can be appreciated from FIG. 4.
  • the present invention comprises various embodiments of means and an overall method of controlling the wear and the need for replacing both liner members and lifter bars of rotatable tumbling mills of various types.
  • Such means and method are extremely simple and, in addition to minimizing the cost of these elements per se, the present invention also substantially reduces the amount of time required to replace such elements, when actual replacement is required, thereby effecting an overall economy in the operation of the mill, but, more importantly, maintaining a subs-tantially constant contour within the mill, which is especially important with regard to autogenous grinding mills.
  • the mill shell 84 supports a plurality of liner segments 86, the opposite edges of which are provided with longitudinal flanges 88 for purposes of adjacent, but slightly spaced, flanges on successive liner segments being received respectively within recesses 90 formed along opposite sides of the lifter bars 92 and 94-.
  • lifter bars 92 and 94 automatically are secured in operative position without requiring bolts or other fastening means to be extended through such lifter bars.
  • the lifter bars 92 are of the high type, while the intermediate lifter bar 94 is of the medium height type.
  • FIG. 10 A more simple embodiment than that shown in FIG. 9 is shown in FIG. 10, by way of a further embodiment of the present invention, and in which the shell section 96 supports a plurality of circumferentially spaced exemplary liner sections 98, which may be fastened to the shell by any suitable means, such as conventional bolts used for such purpose, but not specifically illustrated in the figure. Within the spaces between successive liner sections 8 are alternately disposed high lifter bars 1% and medium height lifter bars 102. These bars also may be secured to the shell section 96 by appropriate bolts, not shown. All of these liner sections and litter bars are formed from customary types of hard, wear-resistant material, and it will be seen that in the embodiment of FIG.
  • the arrangement of the high and medium height lifter bars alternately between similar liner sections 98 will result in gradual wearing of these elements in the manner described with respect to the phenomenon illustrated in FIGS. 6-8, while maintaining a substantially constant contour within the mill, notwithstanding such gradual wearing of the components comprising the lining and lifting means within the mill.
  • FIG. 11 Still another embodiment is illustrated in segmental and somewhat diagrammatic form in FIG. 11, wherein another shell section MP4 is shown, fragmentarily, while liner segments all of substantially the same Width, but progressively different heights, are employed.
  • liner sections 106 are disposed adjacent shell section 104 and secured thereto by any suitable means, such as customary bolts, not shown, While arranged between spaced liner sections 106 are pairs of relatively broad high lifter bars 108 and medium height lifter bars 110, all of which may be detachably secured to the shell section 104 by suitable bolts, of conventional nature, not shown.
  • the optimum speed usually ranges between 60% and 85% of the critical and theoretical speed, which is 54.19 ⁇ Radius in ft.
  • a method of controlling the wear of the lining surfaces and lifter bars of a tumbling mill to maintain the interior contour of the mill substantially constant over substantial periods of use comprising the steps of utilizing a plurality of lifter bars of at least two different heights extending radially inward from the lining surfaces within the mill arranged alternately in sequence and exposed to the tumbling action of the load within the mill, operating the mill until the lifter bars of lesser height have been worn by impact and abrasion to a degree which renders the lifting capabilities of such bars less effective, and replacing such worn lifter bars of lesser height with new lifter bars of greater height to restore the lifting effect of the interior of the mill to produce substantially the initial sequence of lifting bars and corresponding lifting effect and thereby generally restoring the same interior contour.
  • a method of controlling the wear of the lining surfaces and lifter bars of an autogenous tumbling mill havmg a substantially greater diameter than length to maintain the interior peripheral contour and lifting effect afforded thereby within the mill substantially constant over extended periods of use, said method comprising the step of providing a plurality of groups of lifter bars respec tively of at least two different radial heights extending radially inward from the inner lining surface of the mill and bars of each different height group being arranged relative to the inner lining surfaces of said mill to provide a desired predetermined contour pattern having a desired lifting effect, operating the mill autogen-ously to grind friable material until the lifter bars of original shorter height have been worn by the material to a predetermined extent, and replacing such worn lifter bars of shorter height with new lifter bars of greater height while retaining the partially worn lifter bars originally of greater height, thereby to restore the desired lifting contour pattern to the interior of said mill.
  • a method of autogenously grinding friable material comprising a mixture of different size ranges thereof by tumbling within a mill to reduce all of said size ranges of said material to a desired predetermined range of fine sizes comprising the steps of feeding said material to a tumbling mill provided with lifter bars and a lining surface, said lifter bars being of least two different heights and extending radially inward from the lining surfaces of said mill and and arranged alternately in successive relationship relative to the lining surfaces of said mill, observing the grinding results after a predetermined period of time, substituting lifter bars of different heights for those initially used and observing the grinding effect produced by such substituted bars, selecting the alternate lifter bar heights productive of optimum autogenous grinding results, and maintaining said interior contour produced by said selected lifter bars substantially constant by operating the mill until the lifter bars of lesser height are worn by impact and abrasion to a degree which renders the lifting capabilities of such lifter bars less effective, and replacing such worn lifter bars of lesser height with other lifter bars of greater height when needed
  • a rotatable tumbling mill for grinding friable material and comprising in combination, a mill shell; means to support said shell for rotation; lining means connected to the interior of the said shell to protect said shell, and a plurality of lifter bars of at least two different heights extending transversely to the opposite ends of said shell and spaced circumferentially therearound; and means detachably securing said lifter bars to the interior of said mill shell, said bars extending radially inward from said lining means and being arranged relative to said lining means to provide an interior contour of predetermined shape to afford a desired lifting effect upon material when within the mill and being tumbled, said lifter bars of different height being interchangeable with each other and said predetermined interior contour shape being maintained substantially constant by replacing the lifter bars of lesser height which have been worn a predetermined amount with new lifter bars of greater height, whereby the original lifter bars of greater height then are worn substantially to the height of the original bars of lesser height and afford the desired differential in heights of the various lifter bars relative to said lining means
  • the mill set forth in claim 6 further characterized by said lifter bars of lesser and greater height having lining elements interposed therebetween and said lifter bars each comprising composite lifter means composed of a lower wedge bar engageable with the edges of said lining elements to position the same operatively Within the mill and an upper wear bar portion detachably connected to the upper surface of said lower wedge bar, whereby when an upper wear bar portion is worn a predetermined amount and requires replacement the new wear bar portion is mounted upon the original wedge bar, thus minimizing waste.
  • mill shell comprises a peripheral portion connecting opposite ends and the lining means and lifter bars of various heights are connected to said peripheral portion of said mill shell and extend transversely relative to the ends of said mill substantially in parallelism with the axis of the mill.
  • the mill set forth in claim 6 further characterized by said lifter bars of lesser and greater height having lining elements interposed therebetween and said lifter bars each comprising composite lifter means composed of a lower bar portion engageable with the edges of said lining elements to position the same operatively within the mill and an upper wear bar portion detachably connected to the upper surface of said lower bar portion, whereby when an upper wear bar portion is worn a predetermined amount and requires replacement the new wear bar portion is mounted upon the original lower bar portion, thus minimizing waste.
  • the mill set forth in claim 6 further characterized by said predetermined shape of interior contour of the mill shell in the direction of rotation of the mill comprising lifter bars of greater and lesser height and lining members being between all successive lifter bars.
  • the mill set forth in claim 6 further characterized by said predetermined shape of interior contour of the mill shell in the direction of rotation of the mill comprising lifter bars of greater and lesser height adjacent each other and preceding a lining member.

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  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US224075A 1962-09-17 1962-09-17 Grinding mill lining and control of the wear thereof Expired - Lifetime US3211387A (en)

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Application Number Priority Date Filing Date Title
US224075A US3211387A (en) 1962-09-17 1962-09-17 Grinding mill lining and control of the wear thereof
GB34007/63A GB999521A (en) 1962-09-17 1963-08-28 Method and apparatus for controlling the interior contour of a tumbling mill
DEH50236A DE1227315B (de) 1962-09-17 1963-09-11 Auskleidung einer rotierenden Behaeltermuehle
FR947220A FR1382971A (fr) 1962-09-17 1963-09-11 Procédé et appareil permettant de contrôler ou régler le profil intérieur d'un broyeur basculeur

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DE (1) DE1227315B (fr)
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Cited By (12)

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Publication number Priority date Publication date Assignee Title
US3294325A (en) * 1963-09-20 1966-12-27 Dominion Eng Works Ltd Autogenous grinding mill
US3604637A (en) * 1969-10-29 1971-09-14 Allis Chalmers Mfg Co End liner assembly for rotary mill or the like
US3802634A (en) * 1972-02-02 1974-04-09 Koppers Co Inc Method and apparatus for lining a grinding mill
US3894696A (en) * 1972-08-02 1975-07-15 Skega Ab Device at grate means mounted in a mill or another processing apparatus
WO1981002396A1 (fr) * 1980-02-27 1981-09-03 Hanna Mining Co Garniture pour moulin autogene sec
US4323199A (en) * 1980-02-27 1982-04-06 The Hanna Mining Company Mill liner for dry autogenous mills
US4406417A (en) * 1980-02-27 1983-09-27 The Hanna Mining Company Mill liner for dry autogenous mills
US5361997A (en) * 1993-04-07 1994-11-08 Industrial Rubber Applicators, Inc. Discharge assembly for grinding mills
CN102836760A (zh) * 2011-06-25 2012-12-26 顾开明 一种带加强筋的篦板衬板
US20130062449A1 (en) * 2010-05-14 2013-03-14 Polycorp Ltd. Lifter bar assembly and grinding mill including same
CN105214792A (zh) * 2015-11-04 2016-01-06 北方重工集团有限公司 一种分段曲线型提升筋衬板
US10456884B2 (en) 2016-05-19 2019-10-29 Polycorp Ltd. Liner system for a mill shell

Families Citing this family (6)

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US3804346A (en) * 1972-09-11 1974-04-16 T Norman Liner for grinding mills
SE8106899L (sv) * 1981-11-19 1983-05-20 Hoeganaes Ab Eldfast foder for ugn
JPS5944547U (ja) * 1982-09-10 1984-03-24 宇部興産株式会社 ボ−ルミル
CN102861638A (zh) * 2012-10-05 2013-01-09 广西梧州港德硬质合金制造有限公司 硬质合金滚动球磨机
RU181334U1 (ru) * 2017-10-19 2018-07-11 Виктор Алексеевич Степаненко Металлическая плита для футеровки шаровой барабанной мельницы
RU2756554C1 (ru) * 2020-07-24 2021-10-01 Акционерное общество "Центральный научно-исследовательский институт материалов" Износостойкая футеровка

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GB191107801A (en) * 1911-03-29 1911-12-14 John Samuel Rigby Improvements in the Lining of Tube Mills.
US1207174A (en) * 1916-05-27 1916-12-05 American Manganese Steel Co Mill-liner.
US2949247A (en) * 1956-11-20 1960-08-16 Bofors Ab Liners for ball and tube mills
US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same

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DE589113C (de) * 1932-03-03 1933-12-02 Fried Krupp Grusonwerk Akt Ges Rohrmuehle

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GB191107801A (en) * 1911-03-29 1911-12-14 John Samuel Rigby Improvements in the Lining of Tube Mills.
US1207174A (en) * 1916-05-27 1916-12-05 American Manganese Steel Co Mill-liner.
US2949247A (en) * 1956-11-20 1960-08-16 Bofors Ab Liners for ball and tube mills
US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same

Cited By (13)

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Publication number Priority date Publication date Assignee Title
US3294325A (en) * 1963-09-20 1966-12-27 Dominion Eng Works Ltd Autogenous grinding mill
US3604637A (en) * 1969-10-29 1971-09-14 Allis Chalmers Mfg Co End liner assembly for rotary mill or the like
US3802634A (en) * 1972-02-02 1974-04-09 Koppers Co Inc Method and apparatus for lining a grinding mill
US3894696A (en) * 1972-08-02 1975-07-15 Skega Ab Device at grate means mounted in a mill or another processing apparatus
US4406417A (en) * 1980-02-27 1983-09-27 The Hanna Mining Company Mill liner for dry autogenous mills
US4323199A (en) * 1980-02-27 1982-04-06 The Hanna Mining Company Mill liner for dry autogenous mills
WO1981002396A1 (fr) * 1980-02-27 1981-09-03 Hanna Mining Co Garniture pour moulin autogene sec
US5361997A (en) * 1993-04-07 1994-11-08 Industrial Rubber Applicators, Inc. Discharge assembly for grinding mills
US20130062449A1 (en) * 2010-05-14 2013-03-14 Polycorp Ltd. Lifter bar assembly and grinding mill including same
CN102836760A (zh) * 2011-06-25 2012-12-26 顾开明 一种带加强筋的篦板衬板
CN105214792A (zh) * 2015-11-04 2016-01-06 北方重工集团有限公司 一种分段曲线型提升筋衬板
CN105214792B (zh) * 2015-11-04 2018-05-15 北方重工集团有限公司 一种分段曲线型提升筋衬板
US10456884B2 (en) 2016-05-19 2019-10-29 Polycorp Ltd. Liner system for a mill shell

Also Published As

Publication number Publication date
DE1227315B (de) 1966-10-20
FR1382971A (fr) 1964-12-24
GB999521A (en) 1965-07-28

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