US1696943A - Cane mill - Google Patents

Description

Jam., E, w29.. l,6Q6,943

` F. FARREL, .JR

CANE MILL Filed June 26, 1924 l @Il I (QI d Patented `lan. l, i929.

FRANKLIN FARREL, JR., OF NEW HAVEN,

CGNNECTCUT, ASSEGNOR, BY MESNE AS- CANE Application filed Pune 26,

This invention relates to cane grinding machinery, such as employedfor the ext-raction of juice from sugar cane. ln some ofits aspects it is particularly applicable to mills having a plurality of pairs of soecalled preliminary crushing rolls, which are arranged in front of one or more stands of juice expressing rolls. rlhe invention is particularly concerned with mills or grinding apparatus of the general character set forth in my prior application, Serial No. 145,527 tiled February 16, 1921.

One of the primary obje-cts of my invention is to increase the eiliciency of the grinding or crushing of cane stalks. l

Another object of my invention is to provide a machine in which the cane is'preliminarily crushed and squeezed more effectively than in former practice, so that the stalks will be more thoroughly disintegrated and laid open and the fibres more thoroughly squeezed or pressed for expressing the juice from the libres.

To these and other ends, the invention consists in the novel features and combination of parts to bev hereinafter described and claimed.

In the accompanying drawings:

F ig. 1 is a top plan view of a portion of a cane mill embodying my invention;

Fig. 2 is a sectional view on line 2 2 of Fig. 1.

ln the mill shown in Fig. 1 l have illustrated a preliminary crusher A arranged before a juice expressing mill B, the Crusher comprising two pairs C and D of rolls designed to crush and shred the cane stalks prior to the delivery thereof to the mill B. The number of pairs of preliminary crushing rolls may be varied as desired, but in the particular embodiment now under discussion it may be assumed for 4the purposes of description that the raw cane as it comes from the iield is delivered to the rolls of the crusher C by a suit-able conveyor and chute (not shown). The cane is drawn in and crushed by the rolls 10 and 11 of the Crusher C so as to split open the stalks and separate the libres to some extent, and is then carried over suitable inclined-runways, (not shown) to the second crusher D having the rolls 12 and 13, which further crush and shred the stalks and also express a part of the juice MILL.

1924:. Serial No. 722,515.

therefrom, as will be hereinafter explained. The cane moves from the Crusher D over the usual inclined bed which l have not deemed it necessary to illustrate, and enters between tliei'ollsll'and 15 of the first roll stand of the mill B. rFliese rolls express a port-ion of the juice from the cane, which, it leaves them, is deflected upwardly in the customary manner so as to pass between the roll 14C and a lower roll 1o commonly known as the ba gasse roll. lt will be, of course, understood that the mill B may, and usually will, comprise a plurality of three roll mill stands, such as the one shown, through which'the cane passes in order, in accordance with the usual practice.

The crushing rolls may be of any approved type 4but preferably they will be provided with teeth for hooking or drawing in the cane so that the latter' will befed into the machine uniformly and expeditiously. ln the embodiment under discussion, the rolls 10 and 11 are provided with a plurality of annular or circumferential grooves 10a and 11a which are. substantially V-shaped in cross section. The provision of the circumferentially ll-shaped grooves of the rolls creates correspondingly shaped ridges or ribs, and the ribs of the upper crusher roll are designed to enter the grooves of the lower crusher roll with a certain amountof clearance, as is customary.

In order to provide teeth for hooking into the cane stalks and drawing them into the machine, the preferred practice is to out a plurality of generally longitudinally extending grooves 1()b and 11b in'each of the crusher rolls 10 and l1, these grooves intersecting the transverse or circumferential grooves. The cross sectional shape of the longitudinal grooves just described, can be seen in llig. 2. l/Vhile, however, these grooves are longitudinal in a general sense, they are preferably not exactly parallel to the axis of the roll; in fact, it is considered the best practice to provide an obtuse angle in each lengthwise groove, as shown at 10C in F ig. 1. ln other words, a slightly inclined groove extending from one end of the roll to the center or thereabouts, meets at the latter point a similar groove inclined in the opposite direction and extending to the other end of the roll. These grooves may be inclined at an angle of say 10O to the roll axis, as such an arrangement has given very good results in practice.

The second pair of crusher rolls 12 and 13 are. of the same general character as tne rolls 10 and 11, and are provided with teeth of a similar type, although the pitch of the circumferential grooves is less than that of the circumferential grooves of the first pair of rolls. The number of longitudinal grooves is the same in both pairs. The rolls 12 and 13 are provided Wit-h a series of circumferential il-shaped grooves 12"L and 13 smaller in size than the corresponding grooves 10 and 111L of tl e rolls 10 and 11. However, in spite of the fact that the rolls of the second pair have circumferential ribs of less pitch, the number of longitudinal grooves is the same, so that the juice expressing surface is relatively increased.

The roll shafts 17, 18, 19 and 2G are provided with intermeshing gears 21, 22, 23 and 24, as customary.

lt Will be obvious that when the cane stalks are presented to the first pair of Crusher rolls, they will be expeditiously and effectively drawn in betiveen these rolls by reason ofthe teeth formed by the longitudinal grooves in the roll surface. n the second pair of rolls the cane stalks ivill be broken up and shredded to a vstill greater extent. Owing to the fact that the longitudinal grooves of the second Crusher are widely spaced, in spite of the use of relatively fine circumferential grooves the juice expressing action of the rolls of the second pair Will be considerable, as Well as the shredding action.

lifhile l have shown and described a preferred embodiment of my invent-ion, it is to be understood that it is not limited to all the details shown, but is capable of modification and variation Within the spirit of the invention and Within the scope of the appended claims.

iiifhat I claim is:

1. ln a cane mill, the combination of a three-roll mill, pairs of crushing rolls in front of said mill, the rolls of both pairs being` provieed ivith intersecting circumferential and longitudinal grooves, and the longitudinal grooves of the second pair beingof th .saine spacing as the longitudinal grooves of the first pair whereby the circumferential dimension of the teeth is the same, the pitch of the cireun'iferent-ial grooves being different in the respective pairs.

2. ,in a cane mill, a. plurality of pairs of crushing rolls having' circumferential ribs, said ribs arranged to interinesh, the pitch of the ribs of the second pair being less than that of the ribs of the first pair, both pairs of rolls being also provided with longitudinal grooves, and the longitudinal grooves of the second pair being ivide apart as the longitudinal grooves of the first pair.

ln a. cane mill, the combination of a juice expressing mill, pairs of crushing rolls in front of said mill, sai-d pairs arranged intandem, the rolls of both pairs being provided With circumferential V-shaped grooves and with longitudinal grooves intersecting said circumferential grooves and forming teeth for hooking or drawing in the cane, all of the Crusher rolls being of substantially the same diameter, and the longitudinal grooves of the second pair being of the saine spaeing as the longitudinal grooves of the first pair, whereby the circumferential dimension of the teeth is the saine, the pitch of thel circumferential grooves in the second pair being substantially less than that of the circumferential grooves of the first pair.

t In a cane mill, theV combination of a plurality of pairs of crushing rolls arranged in tandem, the rolls of both pairs being provided ivith circumferential V-shaped grooves and with longitudinal grooves intersecting' the circumferential grooves to form teeth, the teeth of the rolls of the second pair having the same circunifcnential dimension as those of the rst pair, but being greater in number than those of the first pair.

ln Witness whereof l have hereunto set my hand this 23rd day ofJune, 1924-.

FRAHKLN FARREL Jn.

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