US2885156A

US2885156A - Wear lining

Info

Publication number: US2885156A
Application number: US452548A
Authority: US
Inventors: Kenneth E Fitz; Robert W Schulke; Lewis H Wolfe
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1954-08-27
Filing date: 1954-08-27
Publication date: 1959-05-05
Anticipated expiration: 1976-05-05
Also published as: FR1135469A

Description

y 1 Hfmz ET AL 2,885,156

WEAR LINING Filed Aug. 27, 1954K 2 Sheets-Sheet 1 MINIMUM; I

INVENTORS I 5 ATTORNEY May 5, 1959 H. E.'FlTZ ET AL 2,

WEAR LINING Filed Aug. 27, 1954 2 Sheets-Sheet 2 viii ATTORNEY WEAR LINING Kenneth E. Fitz, Barberton, Ohio, Robert W. Schulke, Westport, Conn., and Lewis H. Wolfe, Barberton, Ohio, assignors to The Babcock & Wilcox Company, New York, N.Y., a corporation of New Jersey Application August 27, 1954, Serial No. 452,548

4 Claims. (Cl. 241-482) This invention relates to grinding machines of the type known as ball mills, tube mills, rod mills, or combination mills, and more particularly to the wear lining for grinding machines of this type.

Wear linings for grinding machines of the type referred to are usually cast or rolled from wear resistant metals and constructed as segments of a circle for installation internally of the shell of the grinding machine. The individual pieces or blocks of the lining are either bolted or wedged in the grinding machine, and are sometimes grouted in place by a layer of zinc or cement, or the like, interposed between the inner circumference of the tubular shell of the machine and the back of the liner. Heretofore, the blocks of the liner segments have been constructed to a specific size and shape for each difierent size of pulverizing machine. This has necessitated stocking large numbers of patterns for the production of castings and has resulted in uneconomical lining costs.

In accordance with the invention, blocks of relatively small size are constructed for installation in substantially any of the commercial sizes of the tubular type of grinding machine. The individual blocks are so constructed as to be self-supporting when installed as the segments of the liner of a grinding machine. The interlocking effect of the blocks is obtained by the complementary relationship of the sides of adjoining blocks which are of the general nature of a ball and socket joint. Pins can be used in the joints between adjoining blocks for more accurate fit of a liner ring in a shell. Advantageously, the construction is such that relatively few patterns can provide linear castings which will be usable in substantially all commercial grinding machines of the tubular shell type.

The various features of novelty which characterize our invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which we have illustrated and described a preferred embodiment of the invention.

Of the drawings:

Fig. l is a section of a segment of a tube mill liner constructed and arranged in accordance with the present invention; v

Fig. 2 is a developed partial plan view of the installed relationship of the tube mill liner of the invention;

Fig. 3 is a partial plan view of an individual wear block;

Fig. 4 is an exterior view of an access opening, with cover, in the shell of a grinding machine equipped with the wear blocks of the invention;

Figs. 5 and 6 are section views taken on the lines 5-5 and 6-6, respectively, of Fig. 4; and

Fig. 7 illustrates a modified block construction constructed in accordance with the present invention.

In the embodiment of the invention illustrated in the drawings the individual plates or blocks 10 of the wear lining are formed generally as a rectangle (in plan) with a short side or width 12 having a dimension of approximately 6 inches and a long side of length 13 having a dimension of approximately 12 inches. The invention is not limited to these dimensions, but this general size is particularly useful for practical commercial purposes since this size will fit substantially all of the commercial sizes of grinding machines of the type described, and particularly those between 5 and 12 feet in diameter. The thickness of the block 10 can be of any desirable value, but for purposes of standardization, it is desirable to use one or two standard thicknesses, such as for example, 1 /2 and 3-inch thick plates or blocks. The configuration of the Wear surface of each block may be as desired. In the embodiment shown, the blocks Ill are constructed in two specific configurations, one block 10A presenting a fiat wear surface, while the other block 10B presents a ridged wear surface.

It will be apparent the blocks 10 may be installed in any desired combination of wear surface configurations, such as for example, with all the surfaces substantially flat or all ridged, or alternately flat and ridged. As shown in Fig. 2, the blocks 10 are installed with two fiat blocks 10A intervening between each of the ridged blocks 10B, to form a specific pattern for the grinding mill lining. Since, as hereinafter described, the blocks are assembled in circumferential rows, with each row self-sustained in the shell of the mill, adjacent rows may be arranged with the ridged blocks in alignment longitudinally of the shell of the grinding mill, as shown in Fig. 2. Alternately, the rows may be displaced circumferentially of the shell so that the ridged blocks form a spiral of raised wear surface internally of the grinding mill.

The wear liner block 10 of the invention is rectangular in plan, as shown in Fig. 2, with a generally flat bottom 15 having

longitudinal pads

16 and 17 extending partially along the long sides thereof as shown in Fig. 1. When in an installed position, the

pads

16 and 17 rest on the shell 20 of the grinding mill and extend in a direction parallel to the axis of the shell. A block 10A having a flat wear surface 21 is shown in Fig. 1, while the block 108 has a raised or ridged Wear surface 22;. The bottom 15 and

sides

23, 24 and 26 of both the flat wear surface and raised wear surface blocks are essentially the same, with the raised surface 22 cast as a part of the block 10B. In the illustrated example, the flat block 10A is 3 inches in thickness, while the raised surface block 10B is 4 /2 inches in thickness at the peak thereof. The raised portion is formed by merging curves of 1 /2 inch radius with the peak intermediate the

sides

24 and 26 of the block, and extending the full length of the block, i.e. the dimension 13.

The short sides 23 of the blocks 10 (dimension 12) are normal to the bottom 15 or base portion of the block, and each side is provided with a grooved central portion 27 extending the full depth of the block. The

sides

24 and 26 of each block (whether the

block

10A or 10B) taper upwardly from the base portion 15 for a distance of approximately 2%" (in a 3" thick block). In the embodiment shown, the width of the block at its base is actually 6% and at the upper end of the tapered sides the width is 6". The taper of both sides is increased toward the top of the block, being of the order of 6 on the side 24 and 915" on the side 26 with the upper corner of each side rounded to a radius of /2.

A curved recess 28 is formed in the side 26 as the segment of a cylinder having its axis parallel to the plane of the bottom or base portion 15 and spaced between the base 15 and the top or wear surface 21 (or 22). In the embodiment shown in Fig. 1, the radiusof the curved recess 28 is '91 with. the center of curvature positioned 1%" from ,the bottom surface of the pad 17 and outwardly of the outer surface of the side 26. The edges: of thereeess 28 mergeinto the: surface of side 26 with reverse curves, having. a radius of '91 The side 24 is provided with a curvedprotuberance 31 which is formed as a. segment of a cylinder having the same (namely 1 radius as that of the recess 28 and having its axis parallel to the base 15. As shown in Fig. 1 the center of curvature is spaced 1%" above the base and is positioned 3 outwardly of the side 24. Merging reverse curves of /2" radius connect the protuberance 31 with the surface of the side 24;

With adjoining blocks arranged in side by, side relationship and a protuberance 31. of one block engaging in a recess 28 of an. adjoining block, the blocks. can be arranged in a circle, the diameter of which is limited only by the angularity of the tapering sides 24 and26. With the construction shown, the blocks can be used to form the wear liner of substantially all commercial sizes of pulverizers of the type described.

The protuberance 31 is provided with a notch 33 extending longitudinally of the block. Each notch 33 is approximately /2 wide at the tip of the protuberance and the sides thereof slope inwardly at an angle of approximately 60 with respect to the axis ofthe protuberance. As will hereinafter become apparent, the notch 33 will accommodate a. bar or rod 34 insertedbetween adjoining blocks to tighten the circumferential assembly of wear blocks 10 in the pulverizer shell when the internal diameter of the shell is such as to make this desirable. Ordinarily, the internal diameter of the shell will be such that the use of at least a few bars will be necessary to lock the blocks 10 in proper position within the shell of the pulverizer.

The majority of the wear blocks of the lining of the present invention are maintained in position by the interlocking relationship of the recesses and protuberances on circumferentially adjoining blocks, but since access openings are usually necessaryand desirable in the shell of the pulverizing mill, the blocks 10 adjacent such openings, and on the cover plate are bolted in position. Suitable openings are provided in the blocks 10 to accommodate the bolts. These openings are shown in Figs. 1, 3, 4, 5, and 6, and include a countersunk hole. 35 of square cross'section adjacent the wear surface of the block, and a hole 36 of circular cross-section extending through the base portion 15.

A plan view of an access opening in the shell 20 with its cover plate, is illustrated. in Fig. 2. As shown, the wear blocks on all sides of the opening are bolted to the shell of the pulverizing mill, and in addition all of the wear blocks in the access opening are bolted to the removable cover. In the illustration, the access opening is approximately 18 x 24 inches in dimension, with 3 blocks 10 in two adjoining circumferential rows or a total of 6 blocks attached to the cover plate. As shown in Figs. 4, 5, and 6, the opening 40 in the shell 20 is generally rectangular with rounded corners, and is provided with a plate reinforcement which is welded on the outer surface of the shell so asto have generally the same edge configurationas, and to overlap the edges of, the opening 40. same configuration as the opening 40, with length and width dimensions somewhat less than that of the opening 40 and greater than the inside dimensions of the plate 42.

The cover plate 41 is provided with a centrally located handle 43 which is welded thereto, and a pair of spaced bar members '44 which are each removably attached to the cover plate by a bolt 45. Each of the bolts are threaded. into a nut 46 welded to' the cover plate Each of the bar members 44 have suflicient length. so that the end portions of each engage the exterior sur face. of. the plate 42. When installed in its operative The cover plate 41 also has the.

position,. the edges of the cover plate 41. are drawn into contact with the edge portions of the plate 42 by tightening a nut 47 on each of the bolts 45 and bearing upon the bar member 44. To remove the cover, the nuts 47 are removed from the bolts 45, the plate 41 moved in- Wardly of the shell 20,. tilted, and passed through the access opening 40. The bar members 44 are easily moved to one side of the opening 40 or removed from the shell, after the nuts 47 are withdrawn from the bolts 45. a

As shown in Figs. 4, .5, and 6, the wear liner is assembled entirely with blocks 103, although it will be apparent the liner could be formed entirely of the blocks 10A or any combination of blocks 10A and 103, as desired. The blocks are assembled in circumferential rows, as though the blocks were not bolted to the shell 20, although the outside edges of the blocks 10B adjacent the edges of the opening 40 are cast so as to provide a clearance between the blocks 10B forming the sides of the removable liner of the cover plate and the marginal sides of the blocks 10 bolted to the shell 20 adjacent the opening 40. The cast edges of the blocks 10B are shown at 50 and 51 in Fig. 5, where the edge 50 corresponds with the side 26 and the edge 51 corresponds with the side 24 shown in Fig. 1.

When the lining of the present invention is installed in theshell 20 of the grinding. mill, the blocks 10 are self-sustaining as long as the ball and socket joints therebetween are in engagement. When the circumference of the shell is such that acircumferential row of blocks, when installed therein, is not a tight fit so that engagement is lost between the ball and socket joints, it becomes desirable to insert rods 34 between adjoining blocks to increase the circumferential dimension of the row of blocks. Depending upon the diameter of the rods, the circumference of the row of blocks may be increased as-much as two or three inches, or more, as desired.

While in accordance with the provisions of the statutes we have illustrated and described herein a preferred embodiment of the invention, those skilled in the art understand thatchanges may be made in the form of the apparatus disclosed without departing from the spirit of the invention covered by our claims, and that certain featuresof the invention may sometimes be used to advantage without corresponding use of other features.

What is claimed is:

l. The combination with a grinding mill having a rotatable shell of circular cross-section, of a self-supporting wear liner for the internal surface of said shell, said wear liner comprising a multiplicity of blocks arranged in at least one circumferential row, and means for interlocking the blocks in said circumferential row including a longitudinal protuberance formed on the side of one block and engaging a longitudinal recess formed in the side of an adjoining block, said protuberance formed as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block on which said proturberance is formed, said recess formed as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block in which said recess is formed, said axesbeing substantially equally spaced from the bases of said adjoining blocks and in the central portion between the wear and base surfaces of said block.

2. A wear block for installation in the rotatable shell of a grindingmill where a circumferential series of said wear blocks form a self-supporting wear liner ring in said shell, each of said wear blocks including substantially planar sides with a longitudinally extending and longitudinally notched protuberance formed on one of said sides of said block, saidprotuberance formed as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block on which said protuberance is formed, and a recessformed in the opposite of said sides of said block as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block in which said recess is formed, said axes being substantially equally spaced from the base of said block and the radius of curvature of both said recess and said protuberance being the same whereby the adjacent planar sides of adjoining blocks are spaced on the opposite sides of said protuberance and recess of the adjoining blocks.

3. The combination with a grinding mill having a rotatable shell of circular cross-section, of a self-supporting wear liner for the internal surface of said shell, said wear liner comprising a multiplicity of rectangular blocks arranged in at least one circumferential row, means for interlocking the blocks in said circumferential row includ' ing a longitudinal protuberance formed on a long side of one block and engaging a longitudinal recess formed in the long side of an adjoining block, said protuberance formed as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block on which said protuberance is formed, said recess formed as a segment of a cylinder with its axis of curvature spaced outwardly of the side of the block in which said recess is formed, said axes being substantially equally spaced from the bases of said adjoining blocks and substantially midway the wear and base surfaces of said blocks.

4. The combination of claim 1 wherein said wear liner blocks are rectangular, the short sides of each of said blocks are substantially normal to the base thereof and the long sides of each of said blocks having said protuberance and recess and being convergingly inclined from said base.

References Cited in the file of this patent UNITED STATES PATENTS 203,595 Crooke May 14, 1878 264,213 Alsing Sept. 12, 1882 471,173 Guastavino Mar. 22, 1892 518,735 Doolittle Apr. 24, 1894 609,733 Coker Aug. 23, 1898 730,900 Fuller June 16, 1903 828,591 Abbe Aug. 14, 1906 939,637 Rotherham Nov. 9, 1909 6 953,092 Kennedy Mar. 29, 1910 1,032,675 Holland July 16, 1912 1,053,084 Capen Feb. 11, 1913 1,106,897 Sellors Aug. 11, 1914 1,148,151 Culver July 27, 1915 1,164,843 Moad Dec. 21, 1915 1,219,663 Rook Mar. 20, 1917 1,249,764 Johnson Dec. 11, 1917 1,350,434 Barsness Aug. 24, 1920 1,399,546 Ellis Dec. 6, 1921 1,430,431 Binkley Sept. 26, 1922 1,468,893 Wolever Sept. 25, 1923 1,591,938 Harrison July 6, 1926 1,601,956 Gammeter Oct. 5, 1926 1,748,039 Kennedy Feb. 18, 1930 1,787,897 Durnin Jan. 6, 1931 1,844,497 Brassert et a1 Feb. 9, 1932 1,934,461 Hartley Nov. 7, 1933 2,114,640 Rumbarger Apr. 19, 1938 2,275,992 Rahner Mar. 10, 1942 2,362,811 Fitzgerald Nov. 14, 1944 2,388,297 Slaughter Nov. 6, 1945 2,476,505 McIntyre July 19, 1949 2,542,778 McIntyre Feb. 20, 1951 2,555,171 Weston May 29, 1951 FOREIGN PATENTS 5,739 Great Britain 1 of 1828 166,073 Austria June 10, 1950 220,150 Switzerland June 16, 1942 346,375 Great Britain Apr. 7, 1931 424,308 France Mar. 10, 1911 435,524 Germany Oct. 18, 1926 993,264 France July 18, 1951 OTHER REFERENCES Types of Tube Mill Liners, From Mineral Industry, 193 8, volume 47, page 682.

Modern Refractory Practice With Special Reference to the Products of Harbison-Walker Refractories Company, Pittsburgh, Pennsylvania, copyrighted by H.W.R. Co., 1950, pages 40, 54 and 130, particularly cited.