EP0234026A2 - Gegenstände, deren Oberfläche mit einer verschleissfesten Schicht versehen ist und Verfahren zu deren Herstellung - Google Patents

Gegenstände, deren Oberfläche mit einer verschleissfesten Schicht versehen ist und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0234026A2
EP0234026A2 EP86117342A EP86117342A EP0234026A2 EP 0234026 A2 EP0234026 A2 EP 0234026A2 EP 86117342 A EP86117342 A EP 86117342A EP 86117342 A EP86117342 A EP 86117342A EP 0234026 A2 EP0234026 A2 EP 0234026A2
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EP
European Patent Office
Prior art keywords
bowl mill
grinding
surface layer
set forth
article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86117342A
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English (en)
French (fr)
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EP0234026A3 (de
Inventor
Campbell Mckerrow
William Houston Stewart, Jr.
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Combustion Engineering Inc
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Combustion Engineering Inc
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Filing date
Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Publication of EP0234026A2 publication Critical patent/EP0234026A2/de
Publication of EP0234026A3 publication Critical patent/EP0234026A3/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • This invention relates to articles of the type that are designed to be subjected to highly abrasive operating conditions which in turn renders it necessary that such articles have at least the outer surface layers thereof formed of a material which possesses good wear resistant qualities. More specifically, this invention in particular relates both to the grinding rolls which are employed in a pulverizer of the type that is particularly suited to be used to effect the pulverization therewithin of a material such as coal, and to the mill liners that are employed in selected interior regions of the pulverizer.
  • An essential component of any steam generation system in which coal is utilized as a fuel is obviously the apparatus that is employed for purposes of accomplishing the pulverization of the coal so as to render it suitable for use as a fuel.
  • one apparatus in particular which has frequently been utilized to accomplish the pulverization of coal so as to render it suitable for use as a fuel in a coal-fired steam generation system is that which those in the industry commonly refer to as a bowl mill.
  • the bowl mill obtains its name principally from the fact that the pulverization, i.e., grinding, of the coal that takes place therewithin occurs on a grinding surface which in configuration bears a resemblance somewhat to that of a bowl.
  • two of the essential components of such a bowl mill are one the body portion, i.e., housing, within which the grinding surface, i.e, grinding table, from which the bowl mill derives its name is mounted for rotation, and two the plurality of grinding rolls that are supported in equally spaced relation one to another within the housing of the bowl mill so as to be able to coact with the grinding table such that the coal disposed on the surface of the grinding table is capable of being ground, i.e., pulverized, as a consequence of the grinding force that the plurality of grinding rolls apply to the coal.
  • the grinding rolls are each designed to be mounted on a shaft-like member.
  • the grinding roll preferably has a through passage provided through the center thereof.
  • This through passage enables the shaft-like member to be positioned therewithin so that the grinding roll is thereby positioned in mounted relation thereto.
  • the grinding roll be made of a material that is characterized by its ease of machinability, i.e., a relatively soft material such as gray iron.
  • the external, i.e., outer, surface layer of the grinding roll be of a material that is characterized by its good wear resistant qualities.
  • the reason for this is that in the course of effecting the pulverization of material with these grinding rolls, the latter are of necessity subjected to a harsh abrasive action by virtue of the nature of the material being pulverized as well as by virtue of the manner in which the pulverization takes place.
  • the result thus is that the grinding rolls are susceptible to being rendered unusable because of excessive wear in a relatively short period of time, i.e., the rolls are found to have a relatively short operating life.
  • the outer surface layer, of the grinding roll is shaped in accordance with the predicted wear characteristics that the grinding roll is expected to experience based on the nature of the use to which the grinding roll is intended to be put such that the contour thereof replicates that of a worn grinding roll, and a substantially uniform layer of a material characterized by its wear resistant qualities is applied to the outer surface of the grinding roll so as to form the wear surface of the grinding roll.
  • trimetal grinding roll which embodies a trimetal form of construction and wherein the core material, i.e., the first or inner layer, of the trimetal roll consists of a relatively soft material that is noted for its good machinability, the next, i.e., second or intermediate, layer of the trimetal roll comprises a material that has medium wear resistant qualities and the last, i.e., third or outer, layer of the trimetal roll comprises a material having highly abrasive resistant qualities.
  • the core material i.e., the first or inner layer
  • the trimetal roll consists of a relatively soft material that is noted for its good machinability
  • the next, i.e., second or intermediate, layer of the trimetal roll comprises a material that has medium wear resistant qualities
  • the last, i.e., third or outer, layer of the trimetal roll comprises a material having highly abrasive resistant qualities.
  • the composition of Stoody 103 material is such that among others, this material includes in the approximate amounts, by weight percentages, set forth hereinafter the following elements: Carbon - 4.0%, Manganese - 5.0%, and Chromium - 27.0% to 28.0%.
  • Stoody 103 material is said to include neither molybdenum nor boron, except perhaps in quantities which are barely discernible.
  • the material known as Stoody 103 most commonly is employed in the form of a weld overlay that is applied to the grinding roll so as to comprise the outer surface thereof, i.e., so that the layer of Stoody 103 material which is applied thereto forms the wear surface of the grinding roll. It has been alleged that the wear resistant qualities of Stoody 103 material are, by a factor of one and one-half to two times, better than those of the material which for ease of reference is referred to hereinafter as ordinary Nihard.
  • the white case iron which forms the subject matter of the aforereferenced International patent application is defined therein as comprising a base of iron, and, by weight percentages, 2.0% - 4.5% Carbon, .001% - 4.00% Boron and one or more of the following alloying elements: .001% - 30% Vanadium, Titanium, Niobium, Tantalum, Molybdenum, Nickel, Copper, or Chromium, or mixtures thereof.
  • 703,160 is directed to an alloy that is characterized by its highly abrasion resistant qualities which in turn renders it particularly suitable for use as the material from which to fabricate the outer surface layer, i.e., the wear surface of a grinding, i.e., pulverizer, roll that is designed to be employed in a bowl mill so as to be operative therein for purposes of accomplishing the pulverization of a material such as coal through the coaction of the grinding roll with another surface with which the bowl mill is suitably provided for this purpose.
  • a grinding i.e., pulverizer
  • the highly abrasion resistant alloy to which reference is had here comprises, by weight percentages, 4.0% - 6.0% Carbon, 3.0% - 14.0% Manganese, 1.0% -2.5% Silicon, 15.0% - 30.0% Chromium, and 4.0% - 6.0% Molybdenum, with 0.5% - 2.0% Boron being added thereto, the balance being iron and incidental impurities.
  • the highly abrasion resistant alloy to which U.S. patent application Serial No. 703,160 is directed is predicted to have twice the wear life of that of a prior art form of standard hardfacing material such as the material previously discussed herein known as Stoody 103.
  • patent application GB 2,027,702A is directed to a white cast iron alloy, which the assignee of this application, i.e., Sheepbridge Equipment Limited of the United Kingdom, has seen fit to refer to as "Premium Nihard". Allegedly, the latter alloy has better wear resistant qualities than that of what is being referred to herein as ordinary Nihard, i.e., that material which those skilled in this art have long referred to as Nihard. As described therein, the white cast iron alloy, i.e., Premium Nihard, to which U.K.
  • patent application GB 2,027,702A is directed comprises, by weight percentages, 2.8% - 3.5% Carbon, 0.6% - 2.0% Silicon, 0.05% - 0.5% Manganese, 0.05% - 0.25% Sulfur, 0.5% - 1.5% Phosphorus, 3.5% - 5.0% Nickel, 2.5% - 4.5% Chromium, 0.2% -0.7% Molybdenum, with the balance being iron and incidental impurities. Further, it is to be found stated in U.K. patent application GB 2,027,702A that the white cast iron alloy, which forms the subject matter of this patent application, may also contain up to .01% Bismuth, by weight percentage, to ensure against possible graphite formation particularly in heavy section castings.
  • this upper surface commonly takes the form of what is known to those skilled in this art as a bull ring.
  • the bull ring has been known to be formed as an integral member as well as in the form of a multiplicity of individual segments which collectively comprise the bull ring.
  • the bull ring is designed to be suitably supported on the grinding table so as to be rotatable therewith.
  • the mode of operation of the grinding table of the bowl mill is such that the material to be pulverized is fed in a suitable manner on to the bull ring. Then, as the grinding table and thereby also the bull ring rotates by the grinding rolls the material that is disposed on the bull ring becomes pulverized by virtue of the force applied thereto by the grinding rolls as the bull ring is made to rotate past the grinding rolls.
  • coal particles After being pulverized in the aforedescribed manner, the coal particles are then picked up and become entrained in a stream of air that flows upwardly around the circumference of the grinding table. Once entrained in this stream of air the coal particles are conveyed in suitable fashion through the interior of the bowl mill. In the course of being so conveyed, those coal particles which are larger than desired are made to return to the grinding table for further pulverization, whereas those coal particles which are of the desired size continue their passage through the interior of the bowl mill and eventually exit therefrom. It is while the coal particles are being conveyed in this fashion that the components housed within the interior of the bowl mill are struck thereby which in turn occasions the wear to which reference has been had hereinbefore.
  • a need has been evidenced for such a highly abrasion resistant material which, at a minimum, would be suitable for employment as the outer surface layer, i.e., the wear surface, of a grinding roll and which would in turn enable a grinding roll to be provided that would be characterized by the fact that the grinding roll possesses an improved wear life.
  • such a highly abrasion resistant material should be suitable for employment to form the bull ring that is designed to be emplaced on the grinding table of the bowl mill irrespective of whether the bull ring is intended to be in the form of an integral member or in the form of a multiplicity of individual segments.
  • such a highly abrasion resistant material should be suitable for employment for purposes of forming therefrom the liners that are designed to be selectively emplaced in those regions of the interior of the bowl mill that are known to be susceptible to wear of the type that is occasioned by the coal particles striking thereagainst in the course of their passage through the bowl mill interior while entrained in a fluid medium such as air.
  • a further object of the present invention is to provide such articles embodying a wear resistant surface layer wherein the articles include the bull ring which is designed to be emplaced on the grinding table of the bowl mill.
  • Yet another object of the present invention is to provide such articles embodying a wear resistant surface layer wherein the articles include the liners which are designed to be selectively emplaced in those regions of the bowl mill that based on prior experience are known to be susceptible to wear.
  • Yet still another object of the present invention is to provide such articles embodying a wear resistant surface layer wherein the articles are relatively inexpensive to provide, are relatively easy to employ, and are characterized by their improved wear life.
  • grinding rolls of the type that are particularly suited for employment in a bowl mill wherein the grinding rolls provide the grinding force which is employed for purposes of effecting the pulverization within the bowl mill of material such as coal.
  • the subject grinding rolls each embody a wear resistant surface layer which, as cast, comprises, by weight percentages, 3.2% - 3.4% Carbon, 1.45% -1.65% Silicon, 0.4% maximum Manganese, 4.5% - 5.0% Nickel, 4.0% - 4.25% Chromium, 0.4% - 0.5% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and no Bismuth.
  • a bull ring of the type that is designed to be emplaced on the grinding table of a bowl mill, the latter being operative for purposes of accomplishing the pulverization therewithin of material such as coal.
  • the subject bull ring embodies at least a wear resistant surface layer which, as cast, comprises, by weight percentages 3.5% -3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and 0.015% nominal Bismuth.
  • liners of the type that are designed to be selectively emplaced in those regions which are susceptible to wear of the interior of a bowl mill, the latter being operative for purposes of accomplishing the pulverization therewithin of a material such as coal.
  • the subject liners each embody at least a wear resistant surface layer which, as cast, comprises, by weight percentages 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and 0.015% nominal Bismuth.
  • a bowl mill generally designated by reference numeral 10.
  • reference numeral 10 Inasmuch as the nature of the construction and the mode of operation of bowl mills per se are well-known to those skilled in the art, it is not deemed necessary, therefore, to set forth herein a detailed description of the bowl mill 10 illustrated in Figure 1. Rather, it is deemed sufficient for purposes of obtaining an understanding of a bowl mill 10, which is capable of being equipped with articles embodying in accordance with the present invention an outer surface layer formed of a material characterized by its good wear resistant qualities, that there be presented herein merely a generalized description of the nature of the construction and the mode of operation of the components of the bowl mill 10.
  • the bowl mill 10 as illustrated therein includes a substantially closed separator body 12.
  • a grinding table 14 is mounted on a shaft 16, which in turn is operatively connected to a suitable drive mechanism (not shown) so as to be capable of being rotatably driven thereby.
  • a suitable drive mechanism not shown
  • the grinding table 14 is designed to be driven in a clockwise direction.
  • a plurality of grinding, i.e., pulverizer, rolls 18, preferably three in number in accord with conventional practice, are suitably supported within the interior of the separator body 12 so as to be spaced equidistantly one from another around the circumference of the latter. Note is made here of the fact that in the interest of maintining clarity of illustration in the drawing only one grinding roll has been depicted in Figure 1.
  • each of the latter as best understood with reference to the grinding roll 18 depicted in Figure 1 of the drawing is preferably supported on a suitable shaft, seen at 20 in Figure 1, for rotation relative thereto.
  • each of the grinding rolls, as best understood with reference to the grinding roll 18 of Figure 1 is also suitably supported for movement relative to the upper surface, as viewed with reference to Figure 1, of the grinding table 14.
  • each of the grinding rolls of the bowl mill 10 including the roll 18 illustrated in Figure 1 has a hydraulic means, generally designated in Figure 1 by the reference numeral 22, cooperatively associated therewith.
  • the hydraulic means 22 in a manner well-known to those skilled in the art of bowl mills is operative to establish a hydraulic loading on the grinding roll 18 associated therewith whereby the latter grinding roll 18 is made to exert the requisite degree of force on the coal that is disposed on the grinding table 14 for purposes of accomplishing the desired pulverization of this coal.
  • the material, e.g., coal, that is to be pulverized in the bowl mill 10 is fed thereto by means of any suitable conventional form of feed means.
  • feed means that may be employed for this purpose is a belt feeder means (not shown).
  • the coal Upon being discharged from the feed means (not shown), the coal enters the bowl mill 10 by means of a coal supply means, generally designated by reference numeral 24, with which the separator body 12 is suitably provided.
  • the coal supply means 24 is operative to cause the coal to flow on to the surface of the grinding table 14.
  • a gas such as air is utilized to effect the conveyance of the coal from the grinding table 14 through the interior of the separator body 12 for discharge from the bowl mill 10.
  • the air that is used in this regard enters the separator body 12 through a suitable opening (not shown) formed therein for this purpose. From the aforesaid opening (not shown) in the separator body 12 the air flows to and through the annulus, the latter being denoted in Figure 1 by the reference numeral 26, which consists of the ring-like space that exists between the circumference of the grinding table 14 and the inner wall surface of the separator body 12.
  • the classifier 30 in accord with conventional practice and in a manner which is well-known to those who are skilled in this art operates to effect a further sorting of the coal particles that remain in the air stream. Namely, those particles of pulverized coal, which are of the desired particle size, pass through the classifier 30 and along with the air are discharged therefrom and thereby from the bowl mill 10. On the other hand, those coal particles, which in size are larger than desired, are returned to the surface of the grinding table 14 whereupon they undergo further pulverization. Thereafter, these coal particles are subject to a repeat of the process described above.
  • the amount of force that must be exerted by the latter in order to effect the desired degree of pulverization of the coal will vary depending on a number of factors.
  • one important consideration in this regard is the nature of the coal itself. That is, the amount of force required to pulverize the coal will be a function of the grindability of the coal to be pulverized, i.e., the grinding characteristics of the latter.
  • Another important factor in determining the amount of force that the grinding rolls 18 must exert to accomplish the desired degree of pulverization of the coal is the depth to which the coal is disposed on the grinding table 14, which in turn is a function of the output rate at which the bowl mill 10 is being operated.
  • the grinding roll 18 often consists of a main body portion, generally designated by reference numeral 32, that embodies the overall configuration of a roll, and a layered external surface 34 formed of a different material, e.g., a material which in accordance with the present invention is characterized by its good wear resistant qualities, than that from which the body portion 32 is formed.
  • the body portion 32 is preferably made of a relatively soft, easily machinable material such as gray iron, while the outer surface layer 34 is made of a relatively hard material which has good wear resistant qualities, i.e., exhibits good abrasion resistant characteristics.
  • the body portion 32 has a through passage 36 formed through substantially the center thereof.
  • the through passage 36 is suitably dimensioned so as to be capable of receiving therewithin in assembled relation thereto the shaft 20 to which reference has previously been had hereinbefore, and on which the grinding roll 18 is suitably supported so as to be capable of functioning in the manner described above and as shown in Figure 1.
  • the reasons for fabricating the grinding roll 18 from two dissimilar materials is to give equal recognition to first the fact that there is a need to provide the body portion 32 with the through passage 36 and secondly to the fact that the outer surface 3 4 is subjected to a hard abrasive action in the course of effecting the pulverization of coal.
  • the result therefore, is that on the one hand it is desirable that the body portion 32 be made of a relatively soft, easily machinable material so as to facilitate the formation therein of the through passage 36.
  • At least the outer portion i.e., that encompassed by the outer surface layer 34, to be made of a relatively hard material characterized by its capability to resist wear, and in particular the wear caused by abrasive action.
  • the outer surface layer 34 of the grinding roll 18 in accordance with the present invention is formed of a material which embodies abrasion resistant qualities and which is particularly suited to be employed for purposes of forming therefrom the outer surface layer, i.e. the wear surface, 34 of the grinding roll 18.
  • the material from which the outer surface layer 34 of the grinding roll 18 is formed in accordance with the present invention is further characterized in that it is capable of being cast as well as being it is capable of being utilized to hardface a new grinding roll 18.
  • the material from which the outer surface layer 34 of the grinding roll 18 is formed, as cast comprises, by weight percentages, 3.2% - 3.4% Carbon, 1.45% - 1.65% Silicon, 0.4% maximum Manganese, 4.5% - 5.0% Nickel, 4.0% - 4.25% Chromium, 0.4% -0.5% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum and no Bismuth.
  • the bull ring which is designed to be emplaced on the grinding table 14 of the bowl mill 10 and which embodies at least an outer surface layer that is characterized by its good wear resistant qualities and is constructed in accordance with the present invention
  • the bull ring which is denoted therein generally by the reference numeral 38 is formed of a material that is characterized by its good abrasion resistant qualities. More specifically, the bull ring 38 embodies a first portion, the latter being denoted by the reference number 40 in Figure 3, and a second portion which is identified by the reference number 42 in Figure 3.
  • the first portion 40 is suitably inclined relative to the second portion 42 of the bull ring 38 so as to mate with the outer surface layer 34 of the grinding roll 18. That is, the angle at which the first portion 40 of the bull ring 38 is inclined is suitably selected so as to conform to the angle at which the outer surface layer 34 of the grinding roll 18 is inclined, i.e., the angle at which the first portion 40 of the bull ring 38 is inclined is designed to be complementary to the angle of inclination of the outer surface layer 34 of the grinding roll 18.
  • the bull ring 38 preferably is comprised of a multiplicity of individual segments. However, it is to be understood that the bull ring 38 could equally well without departing from the essence of the present invention take the form of a single integral member.
  • the material from which the bull ring 38 of the grinding roll 18 is formed, as cast comprises, by weight percentages, 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% -0.11% Sulfur, 0.4% - 0.6% Molybdenum and 0.015% nominal Bismuth.
  • FIG. 4 For purposes of completing the description of the articles embodying in accordance with the present invention an outer surface layer characterized by its abrasion resistant qualities, reference will be had in particular to Figures 4, 5 and 6 of the drawing wherein there is to be found depicted a first type of bowl mill liner identified generally by reference numeral 44 in Figure 4, a second type of bowl mill liner identifie d generally by the reference numeral 46 in Figure 5, and a third type of bowl mill liner identified generally by the reference numeral 48 in Figure 6.
  • the bowl mill liner 44 constructed as depicted in Figure 4 of the drawing is designed to be employed in the deflector portion 28 of the vane wheel assembly to which reference has been had hereinbefore in connection with the discussion of the bowl mill 10 shown in Figure 1.
  • each of the bowl mill liners 44 embodies a configuration which is preestablished in order to enable each of the bowl mill liners 44 to be cooperatively associated one with another in a suitable fashion as required in order to function as an operative component of the deflector portion 28.
  • the bowl mill liner 44 embodies a configuration wherein two sides thereof, i.e., those denoted by the reference numerals 44a and 44b in Figure 4, extend substantially in parallel relation one to another, a third side thereof, i.e., the side denoted by the reference numeral 44c in Figure 4, extends substantially at right angles to both the sides 44a and 44b of the bowl mill liner 44, and the fourth side thereof, i.e., the side denoted by the reference numeral 44d in Figure 4, is inclined relative to both the sides 44a and 44b and in addition extends in nonparallel relation to the side 44c of the bowl mill liner 44.
  • edge surfaces of the bowl mill liner 44 of Figure 4 are suitable configured such as by being beveled so as to enable them to mate with the complementary edge surfaces of the bowl mill liners 44 that adjoin thereto. This is not only to facilitate the initial installation of the bowl mill liners 44 within the separator body 12 of the bowl mill 10 of Figure 1, but also to facilitate their removal and subsequent replacement when they become worn. Finally, because of the abrasive action to which they are subjected by virtue of the air having coal particles entrained therein striking thereagainst the bowl mill liners 44 are formed of a material that is noted for its good abrasion resistant qualities.
  • the material from which the bowl mill liners 44 are formed, as cast comprises, by weight percentages, 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum, and 0.015% nominal Bismuth.
  • the bowl mill liners 46 constructed as depicted in Figure 5 of the drawing are designed to be employed in the deflector portion 28 of the vane wheel assembly to which reference has been had hereinbefore in connection with the discussion of the bowl mill 10 shown in Figure 1. Namely, in accordance with the mode of construction of the deflector portion 28, the bowl mill liners 46 are designed to be employed therein as side liners. More specifically, the plurality of bowl mill liners 46 are utilized in the deflector portion 28 wherein each of the bowl mill liners 46 is installed so that the back edge thereof is arranged to be flush with the separator body 12 of the bowl mill 10 of Figure 1 and so that the bottom edge thereof is arranged to be flush with the intermediate liner (not shown).
  • each of the bowl mill liners 46 embodies a configuration which is preestablished in order to enable each of the bowl mill liners 46 to be cooperatively associated one with another in a suitable fashion as required in order to function as an operative component of the deflector portion 28.
  • the bowl mill liner 46 embodies a configuration wherein a first side thereof, i.e., the side denoted by the reference numeral 46a in Figure 5, extends in a first plane, a sec ond side thereof, i.e., the side denoted by the reference numeral 46b in Figure 5, extends in a second plane which is substantially perpendicular to the plane of the side 46a, a third side thereof, i.e., the side denoted by the reference numeral 46c in Figure 5, is inclined relative to the side 46a and in addition extends in nonparallel relation to the side 46b of the bowl mill liner 46, and a fourth side thereof which includes a first portion, denoted by the reference numeral 46d in Figure 5, that extends in parallel relation to the side 46a of the bowl mill liner 46 and a second portion, denoted by the reference numeral 46e in Figure 5, that is inclined relative to the side 46c and in addition extends in nonpar
  • the bowl mill liners 46 are formed of a material that is noted for its good abrasion resistant qualities.
  • the material from which the bowl mill liners 46 are formed, as cast comprises, by weight percentages, 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum, and 0.015% nominal Bismuth.
  • the bowl mill liners 48 constructed as depicted in Figure 6 of the drawing are designed to be employed in the deflector portion 28 of the vane wheel assembly to which reference has been had hereinbefore in connection with the discussion of the bowl mill 10 shown in Figure 1. More specifically, in accordance with the mode of construction of the deflector portion 28, the plurality of bowl mill liners 48 are utilized in the manner of intermediate liners with which the deflector portion 28 is suitably provided. To this end, each of the bowl mill liners 48 embodies a configuration which is predetermined in order to enable each of the bowl mill liners 48 to be cooperatively associated one with another in a suitable fashion as required in order to function as an operative component of the deflector portion 28.
  • the bowl mill liner 48 includes a first portion denoted by the reference numeral 48a in Figure 6 which extends in a first plane, and a second portion denoted by the reference numeral 48b in Figure 6 which extends in a second plane that in turn is inclined at a predetermined angle to the plane of the first portion 48a. Because of the abrasive action to which they are subjected by virtue of the air having coal particles entrained therein striking thereagainst the bowl mill liners 48 are formed of a material that is noted for its good abrasion resistant qualities.
  • the material from which the bowl mill liners 48 are formed, as cast comprises, by weight percentages, 3.5% - 3.7% Carbon, 1.2% - 1.6% Silicon, 0.4% maximum Manganese, 4.3% - 5.0% Nickel, 3.7% - 4.4% Chromium, 0.15% - 0.25% Phosphorus, 0.9% - 0.11% Sulfur, 0.4% - 0.6% Molybdenum, and 0.015% nominal Bismuth.
  • articles that embody a wear resistant surface layer which is formed of a new and improved material that is characterized by its good wear resistant qualities.
  • the articles of the present invention embodying a wear resistant surface layer are particularly suited for employment in a bowl mill of the type which is designed to be utilized for purposes of effecting the pulverization therewithin of a material such as coal.
  • the articles embodying a wear resistant surface layer include the grinding rolls which are designed to be employed in a bowl mill.
  • the articles embodying a wear resistant surface layer include the bull ring which is designed to be emplaced on the grinding table of the bowl mill.
  • the articles of the presen t invention embodying a wear resistant surface layer include the liners which are designed to be selectively emplaced in those regions of the bowl mill that based on prior experience are known to be susceptible to wear. Furthermore, in accord with the present invention the articles embodying a wear resistant surface layer are relatively inexpensive to provide, are relatively easy to employ, and are characterized by their improved wear life.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP86117342A 1986-02-24 1986-12-12 Gegenstände, deren Oberfläche mit einer verschleissfesten Schicht versehen ist und Verfahren zu deren Herstellung Withdrawn EP0234026A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US83194886A 1986-02-24 1986-02-24
US831948 1986-02-24

Publications (2)

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EP0234026A2 true EP0234026A2 (de) 1987-09-02
EP0234026A3 EP0234026A3 (de) 1988-05-18

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EP86117342A Withdrawn EP0234026A3 (de) 1986-02-24 1986-12-12 Gegenstände, deren Oberfläche mit einer verschleissfesten Schicht versehen ist und Verfahren zu deren Herstellung

Country Status (8)

Country Link
EP (1) EP0234026A3 (de)
JP (1) JPS62197161A (de)
KR (1) KR870008049A (de)
CN (1) CN1005537B (de)
AU (1) AU588082B2 (de)
CA (1) CA1312057C (de)
IN (1) IN166426B (de)
ZA (1) ZA871297B (de)

Cited By (1)

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KR100382575B1 (ko) * 2000-09-27 2003-05-01 이영진 미분기의 롤타이어 재생방법 및 재생롤타이어

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0283682B1 (de) * 1987-03-24 1991-07-24 Mitsubishi Jukogyo Kabushiki Kaisha Walzenmühle
KR100828132B1 (ko) * 2007-04-25 2008-05-08 김경진 호흡저항을 최소화 한 운동용 방진 장치
CN105396657A (zh) * 2015-12-07 2016-03-16 宜兴市泰和机械有限公司 一种超细磨粉机
CN105396656A (zh) * 2015-12-07 2016-03-16 宜兴市泰和机械有限公司 一种磨盘磨辊结构
CN107930777A (zh) * 2017-12-22 2018-04-20 李文志 一种新型立式粉磨机
CN108917644B (zh) * 2018-07-19 2020-07-28 工极（北京）智能科技有限公司 三维立体测量系统
CN111778607B (zh) * 2020-07-01 2022-06-28 陕西长达纺织有限责任公司 一种方便操作的纱线碾压装置
CN115491611A (zh) * 2022-10-27 2022-12-20 环磨科技控股(集团)有限公司 一种大型半自磨机专用衬板

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FR1543548A (fr) * 1966-12-28 1968-10-25 Combustion Eng Broyeur à bol tournant
DE1507580A1 (de) * 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
DE2214146A1 (de) * 1972-03-23 1973-09-27 Boehler & Co Ag Geb Innenauskleidung von kugelmuehlen mit mahlplatten aus einer eisen-chromkohlenstoff-legierung
US4002299A (en) * 1975-09-29 1977-01-11 Combustion Engineering, Inc. Hydraulically loaded pulverizer journal
GB2072702A (en) * 1980-03-26 1981-10-07 Sheepbridge Equipment Ltd White cast iron
US4389767A (en) * 1980-12-10 1983-06-28 Combustion Engineering, Inc. Method of manufacturing pulverizer rolls
EP0107044A2 (de) * 1982-10-22 1984-05-02 Combustion Engineering, Inc. Mahlring für eine Kohlemühle
EP0110191A2 (de) * 1982-12-06 1984-06-13 Lummus Crest S.à.r.l. Trimetallmahlwalze und Verfahren zu ihrer Herstellung
EP0111109A2 (de) * 1982-12-08 1984-06-20 Combustion Engineering, Inc. Schaufelkranzanlage mit nihard Verschleissauskleidung
JPS6018267A (ja) * 1983-07-13 1985-01-30 Mitsubishi Heavy Ind Ltd 複合鋳造ロ−ルの製造方法
EP0192972A1 (de) * 1985-02-19 1986-09-03 Combustion Engineering, Inc. Hochverschleissfester Werkstoff

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DE1507580A1 (de) * 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
FR1543548A (fr) * 1966-12-28 1968-10-25 Combustion Eng Broyeur à bol tournant
DE2214146A1 (de) * 1972-03-23 1973-09-27 Boehler & Co Ag Geb Innenauskleidung von kugelmuehlen mit mahlplatten aus einer eisen-chromkohlenstoff-legierung
US4002299A (en) * 1975-09-29 1977-01-11 Combustion Engineering, Inc. Hydraulically loaded pulverizer journal
GB2072702A (en) * 1980-03-26 1981-10-07 Sheepbridge Equipment Ltd White cast iron
US4389767A (en) * 1980-12-10 1983-06-28 Combustion Engineering, Inc. Method of manufacturing pulverizer rolls
EP0107044A2 (de) * 1982-10-22 1984-05-02 Combustion Engineering, Inc. Mahlring für eine Kohlemühle
EP0110191A2 (de) * 1982-12-06 1984-06-13 Lummus Crest S.à.r.l. Trimetallmahlwalze und Verfahren zu ihrer Herstellung
EP0111109A2 (de) * 1982-12-08 1984-06-20 Combustion Engineering, Inc. Schaufelkranzanlage mit nihard Verschleissauskleidung
JPS6018267A (ja) * 1983-07-13 1985-01-30 Mitsubishi Heavy Ind Ltd 複合鋳造ロ−ルの製造方法
EP0192972A1 (de) * 1985-02-19 1986-09-03 Combustion Engineering, Inc. Hochverschleissfester Werkstoff

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PATENT ABSTRACTS OF JAPAN, vol. 9, no. 135 (M-386)[1858], 11th June 1985; & JP-A-60 18 267 (MITSUBISHI JUKOGYO K.K.) 30-01-1985 *

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382575B1 (ko) * 2000-09-27 2003-05-01 이영진 미분기의 롤타이어 재생방법 및 재생롤타이어

Also Published As

Publication number Publication date
AU588082B2 (en) 1989-09-07
IN166426B (de) 1990-05-05
KR870008049A (ko) 1987-09-23
JPS62197161A (ja) 1987-08-31
CN87100970A (zh) 1987-09-23
CA1312057C (en) 1992-12-29
EP0234026A3 (de) 1988-05-18
CN1005537B (zh) 1989-10-25
ZA871297B (en) 1987-08-17
AU6916087A (en) 1987-08-27

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