US2143732A - Grinding body for crusher tubes and similar apparatus - Google Patents

Description

Jan. 10, 1939. V, -1 GERNELLE 2,143,732

Filed June 1,5, 1936 INV ENTOR.

Patented Jan. 10, 1939 PATENT OFFICE GRINDING BODY FOR CRUSHER TUBES AND SIDIILAR APPARATUS Henry Victor Jean Gernelle, Reims, France Application June 15, 1936, Serial No. 85,353 In France June 22, 1935 `1 Claim.

The present invention relates to grinding bodies intended for use with crushing tubes and other pulverizing apparatus and more particularly to finishing tubes.

Grinding balls, cylindrical rollers and other grinding bodies hitherto in use acted chiefly by percussion of said bodies upon the material to be treated the latter resting either upon the grinding bodies lying in the lower part of the cylinder, or on the wall itself of the cylinder.

The efficiency of these bodies nevertheless diminished rapidly step by step as the neness of the ground material increased and this latter rapidly reached a limit which was practically impossible to exceed.

One of the objects of the invention is to use, in addition to the work effected by percussion, the relative displacements of amplitude which are more or less great, of the grinding bodies so as to obtain a result by wedging and friction especially during the wearing away which occurs in a continuous manner in the mass which is car.. ried along, by the` rotary movement of the cylinder, for the part of this mass the inclination of which exceeds the angle of natural slope.

The invention has for its object grinding bodies characterized by the fact that they present one or Several grooves or helicoidal recesses, curved in cross section and suinciently wide and deep to permit of two of these bodies to enter together in engagement or Contact whether it be by engagement with one of the projecting edges of the groove of one body in the groove of another or by reason of the total or partial engagement of a nongrooved surface of one body in a'groove of another body.

The engagement together of the bodies which results from this arrangement has several advantages:

(1) It replaces a very large number of pointed contacts on the grinding bodies by linear contacts and extended supericial contacts ensuring in addition to the work effected by percussion, a rubbing and wedging action of the bodies on the material being treated.

(2) By reason of the helicoidal disposition of the co-acting parts, the resulting rotation of the bodies brought about by their movement causes, through the transmission of movement between them, supplementary relative displacements of said bodies increasing by this fact itself, the rubbing effect.

(3) The material to be treated becomes wedged between the curved rubbing parts of the rollers, and it is carried along in a perfect manner by reason of the mutual helicoidal contact between the grinding bodies.

'Other characteristic features and advantages of the invention will be understood from the following description with reference to the accom- 5 panying drawing which shows, diagrammatically and simply by way of example, a form of construction of an improved grinding body having a single groove.

In this drawing:

Figures 1 and 2 are respectively, a front elevation and a cross section taken on the line II-II of Fig. l, of a roller or grinding body of the cylindrical type made according to the invention.

Figs. 3 and 4 are perspective views showing some of the relative positions of these bodies which they may assume during work.

Figs. 5 and 6 show in two diagrammatic views, the chief methods of making the rollers mesh to- 30 gether.

For clearness in the drawing it has been presumed in these last figures that -the thread of the screw is very big, the grooves in fact being approximately parallel to the axis of the roller.

In the example shown, as Will be clear from Figures 1 and 2, the length of each of the rollers, which are generally cylindrical is approximately one and a half times their diameter and the angle of the helicoidal groove l with the generatrix of the cylinder is approximately 30 but it is naturally to be understood that these proportions are indicated only to give an idea and that the inventiony is in no way limited thereto.

The helicoidal groove I of each roller which is generally curved in cross section, is suiiiciently large and deep to permit two neighbouring rollers such as those shown in Figs. 5 and 6 to engage mutually equally well by the engagement of the cylindrical surface of one of the rollers in the helicoidal groove of the other (2 and 5-and 2 and 3 of Fig. 5) as by the engagement of one of the projections 4 formed by the edges of the groove, in the vgroove of the other roller (3 and 'l of Fig. 5) or as by the engagement recipro- 45 cally of one of the two projections of each of the tworollers in contact in the groove of the other (5 and 6 of Fig. 6).

The transverse profile of the grooves is practically circular in the form of construction illustrated, but it is naturally to be understood that the grooves can receive any desired cross section so long as this profile shall generally be curved and permit the rollers to engage together in the manner above mentioned.

Preferably the mean radius of curvature of the cross section of the groove, in particular the radius of the circumferential arc in the example illustrated (Fig. 2) is of the same order as the radius of curvature of the surfaces which are not grooved, preferably slightly different either smaller (2 and 3 of Fig. 5) or larger (2 and 5 of Fig. 5) in particular that the radius of the roller in the case of a cylindrical roller such as the one shown, in such a manner as to determine or produce very small angles between the circumferential surfaces of the generally cylindrical bodies in all the positions which they may occupy relative to each other.

Due to this transverse shape of the grooves, the material carried along in a perfect even manner due to the mutual helicoidal engagement of the rollers, becomes wedged in very small angles between the rubbing surfaces of the rollers.

It is naturally understood that the details of construction illustrated in the drawing have been given only by way of explanation in no way to be taken as limiting the invention which is capable of being modified in other ways Without exceeding the scope thereof. Thus, instead of the cylindrical shape shown, the rollers may have any other form generally capable of providing between two rollers which move one relatively to the other such as results from the meshing and the form of the grooves, a slipping or sliding of the contacting surfaces in a direction perpendicular o-r oblique to the line of contact. Similarly, the rollers could advantageously terminate at one or both their ends, in a truncated conical or spherical portion facilitating the insertion of the rollers together.

I claim:

As articles of manufacture grinding bodies for disintegrating matter in grinding mills comprising each a cylindrical body generally circular in cross-section and provided with a wide and shallow helicoidal groove in its side, said groove Vcomprising a minor portion of the cylindrical surface of said body, this body being of curvilinear formation throughout its circumference and the radius of said groove in cross-section being substantially the same as the radius of the external surface of the non-grooved portion of said body, adjacent bodies being adapted for inter-fitting engagement with each other, and the matter interposed between their contacting surfaces being subjected to a grinding action.

HENRY VICTOR JEAN GERNELLE.

CERTIFICATE OF" CORRECTIONg Patent No., 2,l) |.5,752. l January 1Q, 1959.,

. HENRY VICTOR JEAN GERNELLE It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the g1ant, line 6, title of invention, for "BODDIES" read BODIES; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 21st day of' March, D., 1959.

Henry Van Arsdale.

(Seai') Acting Commissioner of Patents

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