AU622917B2

AU622917B2 - Shell liner

Info

Publication number: AU622917B2
Application number: AU37817/89A
Authority: AU
Inventors: Dennis Eric Farnworth
Original assignee: Skega AB
Current assignee: Skega AB
Priority date: 1988-07-04
Filing date: 1989-07-04
Publication date: 1992-04-30
Anticipated expiration: 2009-07-04
Also published as: AU3781789A

Description

Form COMMONWEALTH OF AUSTRAl P PATENTS ACT 1952-69 COMPLETE SPECIFICATIO

(ORIGINAL)

Class Application Number: Lodged: SComplete Specification Lodged: Accepted: Published: Priority Related Art: *t 7 Int. Class Name of Applicant: SKEGA AB Address of Applicant: S-934 02 Ersmark, Sweden Actual Inventor: Address for Service: EDWD. WATERS SONS, 50 QUEEN STREET, MELBOURNE, AUSTRALIA, 3000.

Complete Specification for the invention entitled: SHELL LINER The following statement is a full description of this invention, including the best method of performing it known to US la This invention relates to a shell liner for a mill such as a ball or pebble mill.

According to the present invention there is provided a shell liner for lining a mill shell, comprising: a substantially rectilinear grid-like metal structure having pockets or apertures and having an underneath surface, an upper surface, two opposed sides and two opposed ends; and a lining means made from a rubber material, said lining means lining: said underneath surface of the metal structure to be complementary to the shell, the ends of the metal structure to promote sealing in use to adjacent liners and to the shell, and said upper surface of the metal structure to provide the liner with an upper wearing surface.

The entire underneath surface of the metal structure may be lined to provide the liner with an underneath surface that is complementary to the inner surface of the shell. The upper surface of the metal structure may also be lined to provide the liner with an upper wearing surface.

1 5 The lining means may preferably be rubber based.

Two passages may be provided, which extend through the metal structure and the polymeric material, whereby the liner may be secured to the shell.

In order to minimise the mass of the liner, the metal structure may be gridlike with pockets or apertures. These pockets or apertures may also be filled with the same material as used for the lining means. Conveniently, the polymeric material may be applied by a casting process, the metal structure being supported in a suitable mould Sand with the polymeric material being cast into the mould to cover the metal structure and to fill any pockets or apertures therein.

The metal structure may be a conventional, new or used, grid liner.

As a further improvement, the liner may have a channel in its upper surface which extends from one end to the other, in which a lifter bar is received. With XEROX ELCOPIER 295 30-- 6-89; 9:33 PM; 46 08 207544 +6136141334 2 2 this embodiment, the metal structure may increase in thickness outwardly from a central region. The metal structure may thus provide an upper surface that slopes and inwardly. It will be appreciated that the upper surface of the metal structure is nonetheless covered with the polymeric material which will have a prgressgively increasing thickness towards the middle, with a step to define the channel.

The invention is now described, by way of examples, with reference to the accompanying dz~awings, in which: Fig 1 shows a three-dimensional view of a first (S embodiment of a shell in accordance with the invention; 11 Fig 2 shows a sectioned view of the shell liner C shown in Figure 1, along line 11-II therein; Fig 3 shows a three-dimensional view of a further embodiment of a shell liner in accordance with the invention; and fig 4 shows a sectioned view along line IV-IV therein.

Referring to Figs 1 and 2, a first embodiment of a shell liner in accordance with the invention is designated generally be the reference numeral 10. As seen, the liner 10 is substantially rectalinear having an underneath surface 12, and upper surface 14, two opposed side faces 16 and two opposed end faces 18.

Further, the liner 10 comprises a metal structure (shown in Fig 1 in broken lines) which is encased with a rubber based material 22. The metal structure 20 has corresponding upper and underneath surfaces, sides and ends.

It will be appreciated that the metal structure has pockets 23 which are all filled with the rubber based material 22. Further, the liner has two passages 24 by means of which it may be secured to the shell of a mill (not shown). It will further be appreciated that the mill is cylindrlcal and, accordingly, the liner has XEROX TELECOPIER 295 30- 6-89; 8:34 PM; FROM 46 68 207544 46 Od 207544 4 6136141334 3 89.06.30 12137 tI t I

I

S I t t 25 a corresponding curvature.

It will be appreciated further by those skilled in the art that the metal structure 20 may be a conventional grid liner that is encased with the rubber material 22 by a casting process. The grid liner 20 may be a new or used grid liner.

Referring now to Figs 3 and 4, a further embodiment of a shell liner 30 is shown. The liner 30 is similar to the liner 10 of Figs 1 and 2 in external appearance, except that is has a central channel 32 in which a lifter bar (not shown), is received. Thus, the liner 20 also has an underneath surface 12, an upper surface 14 that is in two parts, side faces 16 and end faces 18.

The liner 30 also has a metal structure 34 which is encased in the rubber based material 22. The metal structure 34 has pockets 23 which are filled with the rubber basud material 22. However, the metal structure 34 has a thin central region 36 with two wings on either side thereof which 'ncrease progressively in thickness to provide an upper surface 38 that slopes do '.wardly and inwardly.

It will be appreciated that, in use, the side faces 16 of adjacent liners 10 or 30 seal with one another, there is sealing between the end faces 18 and adjacent end faces of other shell liners or end liners, and there is also sealing between the underneath surfaces 12 and the inner surface of the shell, because of the nature of the rubber based material 20, thereby minimizing the possibility and the amount of fines being collected between adjacent liners and between the liner and the shell.

By means of the invention, a liner is provided which has good wearing properties and resists the collecting of fines between adjacent liners and between the liners and the shell.

Claims

2. A liner as claimed in claim 1, further comprising two passages extending through the metal structure and the rubber material to be used in securing the liner to the shell.
3. A liner as claimed in claim 1 or 2, in which the metal structure is a conventional, new or used grid liner. 'is A liner as claimed in any of the preceding claims, further comprising a channel in said upper surface, said channel extending from the one end to the other of the liner for receiving a lifter bar therein. A liner as claimed in claim 4, in which said metal structure has a thickness increasing outwardly towards the sides thereof.
6. A liner as claimed in claim 5, in which said rubber material on the upper side of the metal structure has a thickness increasing inwardly from the sides thereof, with a step to define said channel, such that the liner has a substantially uniform thickness on both sides of the channel.
7. A liner substantially as described in the specification with reference to the accompanying drawings. 4- AII XRXTELECOPIER 295 30- 6-89; 8:36 PM; 46 08 207544 *6136141334 '89,06.303 12239 ca~mg~on*o A liner as claimed in claim 9, in whi he thickness of the polymeric material on t ppi~er side of the metal structure increases in dly, with a step to define the channel, so tha e liner has a substantially uniform t. ness on both sides of the
11. A er for a mill, substantially as described in th -cification with reference to the accompanying DATED this 4th day of July 1989. SKEGA AB "0 0 O '0 WATERMARK PATENT' TRADENARK ATFORNEYS QUEEN STREET MELBOURNE. VIC. 3000.