US1845140A - Cane mill - Google Patents

Description

Feb. 16, 1932. F; FARREL, J R 1,845,140

CANE MILL Filed Nov. 27, 1925 5 Shegts-Shee .L

Feb. 16, 1932; FQFARREL. JR- 1,845,140

CANE MILL Filed Nov. 27, 1925 5 Sheets-Sheet 2 42 47 48 gvvuentoz Feb. 16, 1932. F. FARREL. JR 2 1,345,140

CANE MILL Filed Nov. 27, 1925 3 Sheets-$heet 3 L A A A A A A 'o/l/lll llv az vi will v R NW7 5' Patented Feb. 16, 1932 UNITED STATES FRANKLIN FABREL, J 3., OF N EW'HAVEN, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO FARREL-BIRMINGHAM COMPANY, INCORPORATED, ,OF ANSONIA, CON- NECTICUT, .A CORPORATION OF CONNECTICUT CANE MILL Application filed November 27, 1925. Serial No. 71,737.

This invention relates to cane grinding machinery, of the type employed in extracting the juice from sugarcane. In some of its aspects the invention more particularly re i lates to the rolls of the first set of such a cane mill through which the cane passes, although it is not limited to the first set but also applies to succeeding sets of rolls.

g The first set or sets of rolls are generally 39 termed pre-crushers and usually consist of a pair of opposing rolls each rotatably mounted and co-operating with the other to draw in and press material, such as sugar cane,

that the opposed rolls will more efliciently grind and crush the cane and therefore, open its fibres and juice cells for theextraction of the juice therefrom during this operation and succeeding similar ones. The means generally employed for this purpose is of Various forms, the most common possibly being cirerly arranged to greatly assist the drawing in action of the rolls upon the cane as it is fec cumferential groovesor ribs crossedby longitudinally extending grooves which are so arranged with respect to the circumferential ribs that teeth are formed upon the rollspropto the mill or crusher.

- Inasmuch as these rolls are also used for the extraction of the juice from the cane, it is desirable that a large amount of presslng surface be retained in order to provide suificient area of surface so that themill. or crushor will have maximum efficiency 1n this re spect. This invention, therefore, has for its primary object, the provision of a roll or pairlation between the corresponding grooves of the opposed roll is such as to bring about a marked increase in the drawing in, crushing and squeezing action of the opposing rolls of a pair of such rolls.

Another obj ectof this invention is to pro: vide a cane mill with improved rolls whereby the sugar cane will be more effectively crushed and squeezed during the first operationsthereonand at the same time be'more effectively and positlvely drawn in between the opposing rolls, whereby subsequent operations on the cane will operate to more efiiciently extract the .juice therefrom.

.. To these and other ends the invention con sists of the novel features and combination of parts to be hereinafter described and claimed. Intheaccompanying drawin'gsy Fighl is a top plan view of a portion of a cane mill. embodying the features of my invention; l q Fig. 2 is a side view of the part shown in Fig: 1, portionsthereof being'broken away for the sake, of clearnes s;

Fig. 3 is an enlarged fragmentary section.

,on line 33 of Fig. 4, showing the teethof a pair of opposing rolls;

Fig. 4: isan enlarged section substantially PATENT oFF c i Y on line 4-4;, and following the direction of I the longitudinal grooves just forward of the series of teeth formed thereby, shown in Fig.3, i';

Fig. 5 is an end view of a pair of similar rolls, having a modified arrangement'in respect to the grooving thereof;

Fig. 6 is an enlarged section substantially on line 66 and following through the longitudinal grooves just forward of a series of teeth formed thereby of Fig. 5; I

Fig. 7 is an end view of a pair of rolls having a somewhat modified arrangement of grooving; V r

Fig. 8 is an enlarged section substantially on line 88 of Fig. 7, which section follows through the longitudinal grooves justfor-f ward of a series of teeth formed thereby;

Fig. 9 is an end view of a pair ofrolls,

which have a somewhat modified arrange 10 ment of grooving;v

opposing rolls, and is shown inadvance of f same that the juice thereof may be extracted and 11, n thls lnstance arranged for use as a Fig. 15 is an enlarged section substantially on line 15-15 of Fig. 13, and

Fig. 16 is an enlarged section substantially on line 1616 of Fig. 13. l I have illustrated in the drawings a pair of pre-crusher rolls to which the novelfea'- tures of this invention are applied; The precrusher, in this instance, comprises a pair of a three roll mill. It will be obvious, however, that although this arrangement possibly is preferable, the advantages hereinafter .de scribed and the results and objects contem- VT plated will be obtained in a mill having three rolls, two of which are opposing, and WlllCh' are provided with the novel features to'be hereinafter pointed out. The-term pairs of rolls, therefore, as used hereinafter w1ll be understood to refer to any two opposing rolls in a cane mill whether they are the first pair, or pre-crushers, or subsequent rolls, provided that they draw in, crush, squeeze 'or' otherwise act upon the cane to prepare the therefrom by these or subsequently acting rolls.

The portion of a cane mill illustrated in Figs. 1 and 2, comprises the pair of rolls 10 pro-crusher A, to crush and prepare the cane for further action thereon by the rolls 12, 13 and 14 of a mill B. A suitable guiding chute 15 guides the cane into proper position for the rolls 10 and 11 to engage the same and draw it in between them. Another chute 16 leads from the rolls 10 and 11 to the rolls 12 and 13, and from the rolls 12 and 14 the. cane is conducted in a well known manner to further rolls of the train.

7 The rolls 10 and 11 of the pre-crusher A are provided with V-shaped'grooves 20, forming ribs 21, which are of the same pitch longitudinally in each roll so that the ribs in one roll will be received in the grooves of the other roll in meshed relation with the adjacent ribs.

in which the rolls are rotated so as to engage the cane and draw it in between the rolls.

The portions of the circumferential or annular ribs of one roll which cooperate with the portions of the ribs upon the other roll, are constituted by the sides 26 of the ribs and it is the area of the surface of these cooperating portions which determines the efficiency of the rolls in crushing and extracting juice from the cane. It has been found that by decreasing the number of longitudinal grooves in one roll of a pair of cooperating rolls, part of this effective surface is retained and that when the other roll is provided with more longitudinal grooves than the first mentioned roll," the effective drawing-in action of the pair of rolls is not adversely afiected.

In Figs. 1, 2, 3 and 4, longitudinal grooves 22 and 23 of rolls 10 and 11, respectively, are

of the same depth and although the number equally efficient operation might be obtained if this arrangement was reversed and roll 10 was provided with a greater number of longitudinal grooves than roll 11.

In Figs. 5 and 6, I have illustrated a somewhat modified arrangement of the grooving between two opposing rolls 30 and 31. In this arrangement, roll 30 is provided with the peripheral grooves 32 and with the greater number of longitudinal grooves 33, and roll 31 with peripheral grooves 34 and with a lesser number of longitudinal grooves 35. To still further provide increased side surface area upon the ribs 36 formed by the peripheral grooves 34 of roll 31, the longitudinal grooves 35 thereof are not formed or cut into the peripheral ribs 36 as deeply as the longitudinal grooves 33 are formed or out into the ribs 37 of roll 30. This provides a solid bottom portion having a continuous area 38 extending peripherally about the roll 31 at the side of each rib 36 adjacent the bottom or base 38 thereof against which the cane is pressedby the "coacting side surface of the opposing ribs 37 of the roll 30. As in the previously described form shown in'Figs. 1 to 4, inclusive, the drawing-in action of the teeth 39 formed by the intersection of the longitudinal and pe ripheral grooves of the respective rolls is not interfered with.

Figs. 7 and 8 illustrate an arrangement somewhat similar to the arrangement shown in Figs. 5 and 6, but with the difference that the roll 40in this instance, has the lesser number of longitudinal grooves 41 which intersect the circumferential grooves 46, and the roll 42 the greater number of longitudinal grooves 43 which intersect the circumferential grooves 47. The grooves 43 are shallower in roll 42 than are the grooves 41 'of roll 40. The increased rib side surface area which is produced by this arrangement is divided between the roll 40 and the roll 42.

I11 roll 40 the increased area is provided by the increased space between the longitudinal grooves 41 because of there being fewer of them, and in roll 42 by the peripherally extending surface 48 at the base of the ribs 45, produced by the shallow depth of the longitudinal grooves 43.

Fig. 9, 10, 11 and 12 illustrate another arrangement of roll grooving whereby the advantages contemplated are obtained. In this instance, the roll 50 has a lesser number of longitudinal grooves and roll 51 the greater number of longitudinal grooves. The longitudinal grooves 52 and 53 are alternately deep and shallow and intersect the circumferential grooves 56 of roll 50, and the longitudinal grooves 54 and 55 are likewise alternately deep and shallow and intersect the circumferential grooves 57 of roll 51. By this arrangement substantially all the advantages of the continuous side surface area at the base 58 of a rib, extending peripherally around the roll, is obtained for each roll, while the advantages obtained from the difi'erence in number of longitudinal grooves between the rolls is also retained. The rib side surface.

area in this instance, however, is not continuous peripherally but is interrupted at every other longitudinal groove and, therefore, is disposed about the roll in a series of spaced rib side surface areas 59 of a length substantially equal to the circumferential dimension between two longitudinal grooves, or in other words, double the circumferential pitch of the longitudinal grooves.

Another arrangement of grooving is illustrated in Figs. 13, 14, 15' and 16. In this arrangement, roll 60 is provided with circumferential grooves 61 and longitudinal grooves 62 and 63, and roll 64 is provided with circumferential grooves 65 and longitudinal grooves 66 and 67. Roll 60 is illustrated as having the fewer number of longitudinalgrooves and roll 64; as having the greater number, although as in the previous arrangements the reverse is substantially equally effective in operation to obtain the results contemplated.

The longitudinal grooves 62 and 63,01? roll 60 diifer somewhat in form from the longitudinal grooves of the preceding arrangements, in that groove 62 intersects the circumferential grooves 61, first as a shallow cut at the end of the roll and gradually deepens as it approaches the center from both ends, while groove 63 is the reverse by being a deep cut at the end of the roll and gradu ally growing shallower as it approaches the center. In this manner the longitudinal grooves 62 and 63 alternate at the edges as shallow and deep cut and at the center as deep and shallow, respectively. The longitudinal grooves 66 and 67 of roll 64 are arranged and formed in a similar manner as 13 to 16, inclusive, as being effective to adegree in obtaining the advantageous're'sults noted, without reference to the difierenoe in the number of longitudinal grooves in the rollsofapair. 5 I "hile' I haveshown; and describedpreferred embodiments of my invention, it will be understood-thatit is not to' be limited to all the details shown, but is capable of modification and variation which will lie within the spirit of the invention and the scope of the appended claims.

i What I claim is:

1. In a cane mill, a pair of rolls, each of said rolls having circumferential grooves intersected by longitudinal grooves, the longitudinal grooves of each roll being alternately deep and shallow, one roll having a greater number of longitudinal grooves than the other.

-2. In a cane mill, a pair of rolls, each of said rolls having circumferential grooves intersected by longitudinal grooves, one of said rolls having a greater number of longitudinal grooves than the other, the longitudinab grooves in the roll having the greater number of longitudinal grooves being alternately periphery of the roll and provided therein in such a manner to form spaced apart continuous rib base surfaces at the sides of the ribs, the length of said rib base surfaces being substantially equal to twice the peripheral distance between the longitudinal grooves of said roll.

4. In a cane mill, a pair of rolls, each roll having circumferential grooves forming peripheral ribs, and longitudinal grooves intersecting said ribs, the lon itudinal grooves in each roll being alternately deep and shallow at the ends thereof, and respectively becoming alternately shallower and deeper as the groove approaches the portionof the roll intermediate its ends. r

5. In a cane mill, a pair of rolls, each roll having circumferential grooves forming peripheral ribs, and longitudinal grooves intersecting said ribs, the longitudinal grooves in each roll being alternately deep and shallow at the ends thereof, and respectively becoming alternately shallower and deeper as the groove approaches the portion of the roll intermediate its ends, one of said rolls having a greater number of longitudinal grooves than the other.

6. In a cane mill, a pair of rolls, each roll having circumferential grooves forming peripheral ribs, and longitudinal grooves intersectingsaid circumferential grooves and ribs, the longitudinal grooves of one of said rolls being alternately deep and shallow at the ends thereof, and respectively becoming alternately shallower and deeper as the groove approaches the portion of the roll intermediate its ends. f v V In Witness whereof, I have hereunto set my hand this 23d day of November, 1925.

. FRANKLIN FARREL, JR.

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