US3536268A

US3536268A - Mantle for cone crushers

Info

Publication number: US3536268A
Application number: US669215A
Authority: US
Inventors: Howard W Adam; Jerome C Motz; Rudolph J Gasparac
Original assignee: Nordberg Manufacturing Co
Current assignee: Metso Minerals Milwaukee Inc; Nordberg Manufacturing Co
Priority date: 1967-09-20
Filing date: 1967-09-20
Publication date: 1970-10-27
Anticipated expiration: 1987-10-27
Also published as: DE1607559C2; FR1551431A; GB1205420A; DE1607559B1

Description

oct. 27, 1970 Filed sept, 20. 1967 H. W. ADAM ETAL MANTLE FOR GONE CRUSHERS 2 Sheets-Sheet l I l l wrm/raw. www 14,/ 4m

Oct. 27; 1970 Y H, w, ADAM E TAL 3,536,268

I MANTLE FOR GONE CRUSHERS l Filed Sept. 20, 1967v 2 Sheets-Sheet 2 j f5 l 51.4. 54

United States Patent O 3,536,268 MANTLE FOR GONE CRUSHERS Howard W. Adam, Hales Corners, and Jerome C. Motz and Rudolph il. Gaspar-ac, Milwaukee, Wis., assignors to Nordberg Manufacturing Company, Milwaukee, Wis., a corporation of Wisconsin Filed Sept. 20, 1967, Ser. No. 669,215 Int. Cl. B02c 2/00 U.S. Cl. 241-293 16 Claims ABSTRACT OF THE DISCLOSURE A wearing part for use in a cone Crusher and including a cast crushing member having a conical supporting surface, an outer circumferential surface, and a conical crushing surface; the crushing member is made from a hard, wear resistant metal. An annular retaining band is secured around the conical crushing member to prevent the conical member from breaking up during use in the cone Crusher. The cast crushing member may have a plurality of reinforcing rings imbedded or in cavities therein.

SUMMARY OF THE INVENTION This invention relates to cone Crushers and more particularly to wearing parts such as a mantle or bowl liner for such a Crusher.

A primary object of this invention is to provide a wearing part for a cone crusher which has a hard, wear resistant crushing surface and means for retaining any fractured segments of the material forming the crushing surface in operative position should such material fracture or crack during use in the cone Crusher.

Another object of this invention is a Wearing part, such as a mantle or bowl liner, for use in a cone crusher which has a keeper or retaining ring suitably secured around a hard, wear resistant crushing member.

Another object is to provide a Wearing part for 'use in a cone Crusher which includes a crushing member having a generally conical crushing surface and an outer circumferential surface with a retaining ring secured to the outer circumferential surface to maintain the conical crushing surface as a conical surface should the crushing member 'become sectionalized as a result of cracking.

Another object is to provide an economical, long Wearing mantle or bowl liner for use in a cone Crusher.

A further object is to provide a mantle or bowl liner structure which e'nables the use of a hard, Wear resistant material for the active crushing portion thereof.

Other objects and advantages of the invention will become apparent upon reading the following description of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated more or less diagrammatically in the accompanying drawings wherein:

FIG. 1 is a plan View of a mantle structure showing one embodiment of this invention;

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 to an enlarged scale;

FIG. 3 is a cross-sectional view like FIG. 2 of a modified form of the embodiment of FIG. 1; and

FIG. 4 is a partial cross-sectional view of a bowl liner structure showing another embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Like reference numerals Will be used to refer to like parts throughout the following description of the drawings.

Referring now to FIG. l, a mantle has been shown as comprising a truncated conical crushing member 12 and an annular retaining band or ring 14.

V3,536,268 Patented Oct. 27, 1970 lCC The truncated conical crushing member 12 is formed with an outer conical crushing surface 16, an inner conical supporting surface 18, an inner circumferential surface 20 and an outer circumferential surface 22. It should be understood, however, that this invention is not limited to the particular mantle crushing member configuration shown in FIGS. 2 and 3. For example, the angles of inclination of the conical crushing surface 16 and the conical supporting surface 18 may be widely varied; and, as will be understood by those skilled in the art, the shape of the inner circumferential surface 20l may be Widely varied depending upon the means by whichv the mantle 1i) is to be mounted.

Referring now to FIG. 4, a bowl liner has been shown as comprising a crushing member 28 and an annular retaining band or ring 30. The crushing member 28 has been shown `formed with a generally conical portion 32 and an upwardly extending generally cylindrical portion 34. The cylindrical portion 34 includes an outwardly extending guide ange 36 and an upper flange 38. The conical portion 32 includes an inner conical crushing surface 40, an outer conical backing or supporting surface 42 and an outer circumferential surface 44. It should be understood, however, that this invention is not limited to the particular liner crushing member configuration shown in FIG. 4. For example, as will be understood by those skilled in the art, the means by which the liner is mounted to the Crusher bowl, in this instance the cylindrical portion 34 of the crushing member 28, may be widely varied; also, the angle of inclination of the conical supporting surface 42 and conical crushing surface 40 may be widely varied.

The retaining bands or rings 14 and 30' may be shrunk fit around or otherwise suitably secured to the outer

circumferential Surfaces

22 and 44 respectively of the mantle crushing member 12 and liner crushing member 28. For example, it has been found that on a mantle which has a circumferential surface 22 having a diameter of about 35.75 inches, a room temperature diametral interference in the range of .015 to .030 inch between the retaining band 14 and the surface 22 will suitably secure the band 14 to the crushing member 12 When the former is shrunk fit therearound. It should be understood, however, that the retaining bands may be effectively secured to the crushing members by means other than shrink tting. For example, a suitable adhesive might be used; or, the

bands

14 and 30 might be formed with a turnbuckle or other suitable means for drawing the band tightly around the crushing member.

Although the retaining bands or

rings

14 and 30 have been shown as being generally rectangular in cross section, it should be understood that such cross-sectional shapes may take a variety of forms. What is important iS that the retaining bands be adapted to exert a generally radially inwardly directed compressive force around the periphery of the crushing member so that should the crushing member crack during use, the segments of the crushing member formed by such cracks will be retained in an operative position by the retaining band.

The mantle crushing member 12 and liner crushing member 28 are preferably castings and may have reinforcing rings 24 imbedded therein which are spaced from each other by spacers 26 and spaced relative to surface 18 by back spacers 27. For details concerning the rings 24 and

spacers

26 and 27, reference is made to copending application Ser. No. 586,413, liled Oct. 13, 1966 now Pat. No. 3,473,746, issued Oct. 21, 1969.

The mantle crushing member 12 and liner crushing member 28 are made using a hard, wear resistant Inaterial such as perlitic, carbidic, white cast iron; martensitic, carbidic, chrome-nickel alloyed cast iron, sometimes known as Nihard; and like materials having a Brinell hardness number at least as high as 400.

The

bands

14 and 30 may be made of any suitable metal, but it Will be understood that the band should have a tensile strength suliiciently high to resist fracture. For example, the range of ultimate tensile strengths may be as low as 45,000 or less, and as high as 100,000 or more.

The use, operation, and function of this invention are as follows:

Generally, the bowl liner is positioned within a bowl with the liner surface 42 engaging a generally complementary surface formed in the bowl. In the particular configuration shown, the liner may be secured to the bowl by suitable means such as wedge elements which engage the upper ange 38. It should be understood, however, that the liner crushing member 28 may be provided with other suitable mounting means. The bowl and liner surround a head adapted for gyratory motion. The mantle is mounted on the head and may be suitably retained by a member which engages a portion of the inner circumferential Surface and forces the inner conical supporting surface 18 into supporting engagement with a complementary supporting surface on the head. The inner conical crushing surface 40 of the liner and the outer conical crushing surface 16 of the mantle 10 define a crushing cavity into which material is discharged from above for reduction. During such use, the bowl liner and mantle are subjected to extreme stresses which tend to deform and/or cause the bowl liner and mantle to fracture while the crushing surfaces 16 and 4t) are subjected to extreme abrasive forces.

Because of the extreme stresses applied to the wearing parts of a cone Crusher during crushing, the choice of materials from which these parts are made has been limited, in accepted practice, to metals which have relatively poor Wear characteristics, but which have a toughness which enables them to stand the crushing stresses without breaking or cracking. Manganese steel has been a generally accepted and widely used material for bowl liners and mantles. However, although manganese steel is tough and resistant to breaking or cracking, the crushing

surfaces

16 and 40` lmay wear away rapidly when crushing an abrasive material. For example, in some crushing operations, a manganese steel mantle will wear away at a rate of approximately 1A; of an inch per three hour period.

Because of the great wear to which

surfaces

16 and 40 respectively of the mantle and bowl liner are subjected, it is extremely desirable to use hard, wear resistant cast materials such as perlitic, carbidic, White cast iron; marf tensitic, carbidic, chrome-nickel alloyed cast iron, sometimes known as Nihard; and the like which have a Brinell hardness number at least as high as 400. Such materials however, tend to fracture or crack when subjected to stresses in the order of magnitude experienced by a mantle or bowl liner within a cone Crusher.

In the cone Crusher Wearing part structure of this invention, an annular metal retaining band or ring is suitably compressively secured, for example by a shrink tit, to the outer circumferential surface of the cast crushing member so that during use in the cone Crusher, should the cast crushing member fracture, the fractured segments are retained in working position by the metal retaining band. Accordingly, the cone Crusher wearing part structure of this invention enables the use of hard, wear resistant metals for the active crushing portion of the wearing part.

Such fractured segments of the liner or mantle crushing member may be further maintained in working position by rings 24 imbedded or in cavities within the cast crushing member as disclosed in application Ser. No. 586,413, filed Oct. 13, 1966 now Pat. No. 3,473,746. However, these rings may be omitted.

Although the metals described herein are particularly adapted for use in this invention, it should be understood l that the cone Crusher wearing part crushing member may be made from a variety of hard, wear resistant materials.

Further, although several embodiments and modifications thereof have been depicted and described, such are intended to be exemplary only, and not definitive. lt should also be understood that many alterations and variations may 'be made without departing from the inventions fundamental theme. Accordingly, the scope of the invention should be limited only by the scope of the following appended claims.

What is claimed is:

1. For use in a cone Crusher of the type including an annular crushing liner and a head adapted to gyrate relative to said liner and located inwardly of said liner, the improvement comprising a mantle carried by said head for gyratory motion therewith and adapted to crush material in cooperation with said liner, said mantle including, in combination, a crushing member having an inner conical surface for engagement with said gyrating head, an outer conical surface for crushing said material, and an outer circumferential surface, and means for exerting a generally radially inwardly directed compressive force around the periphery of said crushing member to thereby retain fractured segments of said crushing member in operative crushing position.

2. The structure of claim 1 further characterized in that said crushing member has a generally truncated conical cross-sectional shape and is a hard wear resistant metal having a Brinell hardness number not less than 400.

3. The structure of claim 2 further characterized in that said crushing member is formed with reinforcing members therewithin.

4. The structure of claim 1 further characterized in that said means for exerting a force includes a retaining ring secured to said outer circumferential surface of said crushing member.

5. The structure of claim 4 further characterized in that said retaining ring is secured to said outer circumferential surface of said crushing member by shrink fitting it therearound.

6. For use in a Crusher of the type having a bowl and a head adapted to gyrate relative to the bowl and located inwardly thereof, the improvement comprising a crushing member having a conical surface for crushing material, a second conical surface for engagement with said crusher, and an outer circumferential surface, said crushing member being of a hard, Wear resistant material, and means for exerting a generally radially inwardly directed force around the periphery of said crushing member to thereby retain fractured segments of said crushing member in operative crushing position.

7. The structure of claim 6 further characterized in that said crushing member is a hard wear resistant metal having a Brinell hardness number not less than 400.

S. The structure of claim 6 further characterized in that said crushing member is formed with reinforcing members therewithin.

9. The structure of claim 6 further characterized in that said-force exerting means includes a retaining ring scured to said outer circumferential surface of said crushing member.

10. The structure of claim 9 further characterized in that said retaining ring is secured to said outer circumferential surface of said crushing member by shrink fitting it therearound.

11. A wearing part for use in Crushers and the like, including a crushing member having a generally flat, somewhat frusto-conical crushing surface, a supporting surface, and a generally cylindrical outer surface, the crushing member being of a hard wear-resistant material, and a retaining ring on the outer cylindrical surface applying a radial stress inwardly to the crushing member.

12. The structure of claim 11 further characterized in that the crushing member is generally frusto-conical.

13. The structure of claim 11 further characterized in that the retaining ring is applied to the crushing member by a shrink fit.

14. The structure of claim 11 further characterized in that the crushing member is formed of a material having a Brinell hardness number at least as high as 400.

15. A wearing part for use in cone crushers and the like, including a generally at somewhat frusto-conical crushing member having a crushing surface adapted to be disposed and operative in the crushing cavity of the Crusher, a supporting surface on the crushing member adapted to be supported on and bear against a part of the cone Crusher, and an outer peripheral surface on the crushing member, the crushing member being of a hard Wear-resistant material having a Brinell hardness number on the order of 400 or greater, a retaining ring on the outer peripheral surface of the crushing member, and a compression fit between the retaining ring and the cylindrical surface of the crushing member so that the ring applies radial inward stresses to the crushing member.

16. A Wearing part for use in cone crushers including, in combination, a crushing member having a general conical crushing surface and an outer circumferential surface, said crushing member being a hard wear-resistant material, and means for retaining fractured segments of said crushing member in operative crushing position, said retaining means comprising an annular retaining band secured to said outer circumferential surface of said crushing member, said annular retaining band being secured t0 said outer circumferential surface of said crushing member by shrink fitting it therearound.

References Cited UNITED STATES PATENTS 1,494,265 5/1924 Martindale 241-299 1,774,556 9/1930 Jones 241--299X 2,120,697 6/1938 Finnegan 241-293 X 2,467,938 4/1949 Kennedy 241-299 FRANK T. YOST, Primary Examiner U.S. Cl. X.R.