US2066138A - Tube mill - Google Patents

Description

Dec. 29, 1936. J. c. MCKAY-CLEMENTS 2,066,138

TUBE MILL Filed Feb. 12, 1954 50 2a mmmhmmmmmhmmm 7 Patented Dec. 29, 1936 UNITED STATES TUBE MILL John Llewellyn Carr McKay-Clements, New

Liskeard, Ontario, Canada, assignor to The Wabi Iron Works, Limited, New Liskeard, Canada Application February 12, 1934,. Serial N0. 710,829

1 Claim.

The invention relates to a tube mill, and particularly to an insert type of lining, as described in the present specification and illustrated in the accompanying drawing, that forms part of .the

: same.

The invention consists essentially in the insertion into the lining body of removable and replaceable abrading members as pointed out in the claim for novelty following a-description in detail of the preferable form of construction of the insert members in relation to their holders constituting a lining body.

The objects of the invention are to insure efficiency in so far as the functions of the mill are concerned, and durability in regard to the lining parts, so that during the life of this piece of machinery, the renewal of the fixed abrading members in cooperation with the loose abrading members shall be tantamount to the replacing of an inner lining and thus facilitate the separation of the particles of the material to be reduced to granular or powdered condition, such as quartz, coal, grain and many other commodities; to economize in the matter of expenditures for material and labor and considerably increase the output of each machine through the improved condition during operation, and the ease with which replacements may be done, and generally to provide in mining and other manufacturing arts, a continuous means of reducing material to a powdery or granular state without interfering to any serious extent with the tubular body or its reinforcing interior structure.

In the drawing, Figure 1 is a plan view of a proposed section of the lining body.

Figure 2 is a cross sectional View on the line 2-2 in Figure 1.

Figure 3 is a detail showing a front view of an insert.

Figure 4 is a cross sectional View on the line 4--4 in Figure 3.

Figure 5 is a detail showing a side elevational view of the insert.

Figure 8 is a plan view of the section of the lining complete.

Figure 7 is a cross sectional view on the line 1-7 in Figure 6.

Figure 8 is a cross sectional view of the drum showing the assembled lining parts in the interior.

Figure 9 is a longitudinal sectional view of the drum showing the assembled sections of the lining.

Figure 10 is a detail showing a fragmentary view of the assembled drum and lining body and the fastenings.

Figure 11 is a sectional detail of a lining body section showing facilities for the removal of the inserts.

Figure 12 is an insert ejector tool.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawing, the lining is shown as composedin each section of two main parts, the body part andthe insert part, and it must be understood that these two parts may be varied considerably without interfering materially with their functional features, the one part being the holder and the other part the abrader, while the balls or other form of abraders comprise the loose pieces which come in contact with fixed abrading members constituting the inserts. i

There is no doubt that in tube mills, or as they are often called, ball mills, the rapid wear of the abrading parts is a very serious matter, especially on the lining, and various experiments have been made towards mitigating this great evil, as it certainly is a very serious obstacle, both in the matter of the inefficient functioning of the machine, and in the great expense of maintenance for the abrading members, whether they be in ball form or other shape, cause great damage to the lining in the course of their work in reducing the material to be ground, and this has never been satisfactorily avoided by the various attempts to do so, and in the present invention, the lining is in effect a compound affair, comprising the main or body part preferably removable and replaceable and the insert or abrading part held in place by the body part, this abrading part being renewed from time to time either in sets or in individual sections as may be found advisable after inspection.

The drum is indicated by the numeral l5 and just a portion of this drum is shown in the drawing. Usually the inlet and discharge ends converge to the openings for the entry and departure of the material.

The lining to the cylindrical part of the drum is made up of the body part l6 and the abrading members I! forming inserts into the body part which constitutes the holder for the inserts.

The body part is preferably made in sections so that it can be removable, and these sections are constructed with the channels I8 extended in any direction desirable, but here shown as parallel with the axis of the drum.

These channels have the outwardly flaring side walls l9 and the outwardly flaring end walls 20, so as to facilitate the making of a tapered fit.

The bed of each channel is in the base plate 2| the outside of the shell.

Intermediate of the length of the walls I9 there are the communicating passages 25 for the intro duction of the tool 26 having the head 21 for the purpose of extracting the inserts 28 when they become worn and require replacing.

Theinsert 28 forms oneof many abrading members fitted into the'body by the sections I6.

These inserts are each made with the tapered base 29 whichis fashioned so as to make a; perfect tapering and tight fit into a channel l8 and may be further secured in any convenient manner, each insert carrying the projectionsill, which are hereshown in the shape of half balls, which constitute the abrading surfaces.

All of the channels are filled with these inserts, so that circumferentially, the cylindrical portion of the drum forms a continuous surface of permanent and adjacent ball like surfaces which cooperate with the balls 3! in reducing the quartz or other material to a granular'or powdery condition. I r r In the operation of this machine, the drum,

7 shell or whatever else it may be called is as explained, provided with suitable inlet and discharge ends and mounted for rotation so that the balls 3| tumble about inside, with the material tobe' separated into particles, and in tumbling about, the pieces, Whether they are in the shape of balls or any other shape desired, come in contact with the material and pound this material between themselves and the permanent balls forming partof the inserts and carried by the body part of the lining and at the same time protecting the body part of the lining so that it really does not receive the same wear that it would if it had been in direct contact with the material and the abrading or pounding members.

Therefore, the fixed ball like surfaces remain stationary in so far as'their relations with the drum are concerned, but the rotation of the drum causes the necessary friction between the material and the tumbling balls and the stationary balls, consequently, as this action is constant, the material is broken up into particles of the desired size and usually in mining operations, comes out in the form of a sludge.

The abrading members, as already pointed out, may be of any shape desired, though the ball form is usually the most efficient.

The word abrading has been used in connection with the rubbing members, which are in bulbous form and project from the tapering bases of the inserts, but it must. be understood that in this invention, these abrading members are actually' breaking members and carry out the pounding of the material into its many particles, whereas l by earlier methods stamps were used, which pounded on flatsurfaces.

Therefore the abrading members asrthey are generally described are rubbing members and fit in with that definition of the word, though in both fluids and solids, the word breaking signifies the separation into particles and consequently this word breaking has been. largely used in the claim. a

What I claim is:--

A'tube mill comprising a drum, a plurality of sections secured to the inner circumference of the drum and forming a complete inner lining, each section having a plurality of sunk channels enclosed by flaring side and end walls, inserts in the form of bars extending the length of said channels and snugly fitted therein to the height of said walls and abrading members projecting from said bars and overlapping and abutting on said walls and presenting with the bars and walls a closed peripheral surface.

JOHN LLEWELLYN CARR McKAY-CLEMENTS.

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