US1947440A - Beater roll - Google Patents

Description

Feb. 13, 1934. s. MILNE HEATER ROLL Filed July 21, 1933 I w. y

Patented Feb- 13 19 UNITED STATES PATENT OFFICE BEATER ROLL Samuel Milne, Edinburgh, Scotland Application July 21, 1933, Serial No. 681,495, and

in Great Britain February 16, 1932 3 Claims. (01. 92-22 As hitherto made, the said segments have been spaced apart fora distance almost equal to half the width of a segment, a disposition which produces uneven'operation of the machine. Each segment has been formed with a single lifting pocket or cell to promote circulation of the pulp,

. and the small number of the pockets or cells example shown in Fig. 1, that is as applied to a has rendered the circulation of pulp meagre and slow. 7

The object of this invention is to provide an improved construction of beating or refining engine, in which the above-named drawbacks are avoided,. and which also produces improved circulation and increased efiiciency.

According to the invention the basalt lava or like segments are made to a width at their outer part such as to form a practically continuous shell or covering for the roll or other surface, and the segments are provided with two, three or more lifting pockets or cells, preferably equally pitched. When the invention is applied to existing engines, the segments may be substantially T- shaped in cross-section, the stem of the T fitting the usual groove in the body of the roller, or other operating part, or they may have an undercut groove or grooves on their inner face. to fit over an undercut rib or ribs-on the roll. The segments will usually be cementedin position, as heretofore, and cement will be placed between the adjoining faces of the segments. Preferably, though not essentially, one of the pockets or cells will be situated over the joint between the outer parts of the segments.

In the accompanying drawing:-

Figs. 1 and 2 illustrate two forms of the invention as applied to a beating engine, each figure being a cross-sectional elevation of a part of a roll for a beating engine.

Fig. 3 is a plan of a segment as used for a conical refining engine, and

Fig. 4 is a cross-section Fig. 3.

In carrying out the invention according to the on the line 4--4 of roll grooved as heretofore, for say 25 segments, the segments a are shaped to fit the groove and be cemented therein in the usual way, but that part of the segment standing out of the groove is extended at each side to lie over the rib b between the grooves, the adjacent segments meeting (except for intervening cement c mid-way over such ribs. The longitudinal edges of each segment are formed with a concave chamfer a producing ahalf groove, so that two adjacent segments have a groove d over the joint between them forming a'lifting pocket or cell. In the outer face of each segmentand equally pitched from the said grooves are two further grooves d forming further lifting pockets or cells, all the 5 pockets being equally pitched around the roll. A convenient size of groove is 1" wide, and a convenient pitch of groove is 2".

In carrying out the invention according to another example, as shown in Fig. 2, the segments a are made of extended width from the outer to the inner surface, so that the total number of segments for the roll produces a shell or covering of uniform thickness. Each segment has an undercut (dovetail) groove 2 in its inner face running from end to end which fits over a corresponding projection or rib on the roll. "If desired, more than one groove and projection may be provided. By this construction there is less likelihood of the segments breaking when worn so down. I

Any other suitable means of securing the segments to the roll may be employed. For instance they may be drilled, and held in position by screwed studs passing into the roll.

In all cases the segments will be cemented in position. I

The bedplate or bedplates may be grooved with any suitable number of equally pitched grooves.

The invention may be applied to refining. en-

gines of the conical type or disc'type or of any other known type. When applied to aconical type refiner, the segments will be tapered from one end to the other, and also, if desired, from the top face to the lower. face, as shown in Figs.

3 and 4, whilst when applied to a disc type refiner, the segments will be tapered from one end to the other only, and some may be shorter than others.

By thus providing an increased number of grooves a more complete and more rapid circulation is obtained and the equal spacing of the grooves with omission of .the large gaps between the segments ensures improved beating with less shock to the roll.

What I claim is:- i 1. In a paper pulp beating engine, refining engine, or the like, a pulp treating element having a peripheral surface of stone-like abrasive mate-g rial composed of abutting sections, the outer surting portions of the sections.

. 3. In a paper' pulp treating member, a pulp treating element having its surface entirely covered by a stone-like abrasive material formed in sections arranged in abutting relation, each section being formed to provide lifting pockets over the abutting portions of-the sections and also having a lifting pocket between said abutting portions of the sections, all of the pockets being relatively shallow and equidistantly spaced and of like formation, and said element presenting unbroken continuous abrading surfaces between the pockets.

. a SAMUEL MILNE.

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