US1820074A - Means for cooling mill rolls - Google Patents

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g- 25, 3 K. B KILBORN 1,820,074

MEANS FOR COOLING MILL ROLLS Filed Dec. 5/1928 fig/ I Patented Au l'zs, lesl UNITED STATES PATENT OFFICE KARL B. KILBORN, OF FAIRLAWN, OHIO, ASSIGNOR TO SEIBERLING RUBBER COMPANY,

' OF BARBERTON, OHIO, A CORPORATION OF DELAWARE MEANS FOR COOLING MILL ROLLS Application filed December a, 1928. Serial no. 323,537.

This invention relates to means for cooling the hollow rolls of rubber-masticatin and other mills by the action of water applied in a suitable manner, as by spraying it against the inner side of the roll walls. An example of such apparatus is shown in my co-pending application, Serial No. 313,239, filed Oct. 18,

1928. The object of my present invention is to assist in the evaporation of the water and its absorption of heat from the roll by the action of an air current, thereby enhancing the cooling effect and increasing the efliciency of the .cooling system;

Of the accompanying drawings, Fig. 1 is a longitudinal section of a rubber mill having rolls provided with my improved cooling means.

Fig. 2 is a cross-section thereof on the 22 of Fig. 1, on a larger scale.

Fig. 3 is a longitudinal section on a still larger scale showing one of the ejectorspray devices.

Fig. 4 is a longitudinal section and elevation showing a modification.

In the. preferred mode of carrying my invention into effect, as shown in Figs. 1 to 3, I employ for each mill-roll one or more ejectors for spraying the water against the inner side of the roll walls, for mixingthe 3o spray with air, and for forcing an air current longitudinally through the roll to assist in evaporating the water. 10 is the mill frame having standards 11, 11 provided with bearings 12, 12 for supporting the masticating rolls 13, 13. The roll shown in Fig. 1 has afiixed to its mouth end the large driven gear 14 for rotating the rolls, and to its other end a smaller gear 15 for mating with a complemental gear on the shaft of the other roll.

Each roll is hollowed out on its interior to form a central chamber 16 which has a discharge-mouth or outlet 17 of approximately the same diameter as the body of sald chamber in order to avoid accumulation of a 001 of water of any substantial depth on the oorof said chamber, whereby substantially the entire inner periphery of the roll walls is available for exposing a film of water to evaporation thereon, as set forth in my prior application, SerialNo. 313,239, previously line trough 18. Said pipe may be supported in referred to. Thus the roll walls are cooled by conduction of sensible heat to the water film which collects thereon, and also to a large extent by the latent heat of evaporation of said film and of the water spray fed thereto The small stream of by the. jet devices. excess water discharged from the outlet 17 of the roll-chamber falls into a stationary trough 18 provided below said outlet and connected with a suitable drain-pipe. The rolltrunnion at the end opposite the outlet 17 is formed with a prolongation -19 of the cham-' ber 16 Which forms an air-inlet passage leading 'to said chamber. Axially mounted within and extending through the roll 13 is a water-spray pipe 20 having an inlet or supply portion 21 at its outer end and supported at its opposite end on the lip of the discharge the air inlet 19 by a spider 22.

. At suitable intervals along the pipe 20 are mounted ejector devices 23, the construction of one of which is shown in detail in Fig; 3 as consisting of a casting 24 which is centrally formed with a longitudinal through-aperture 25 into which sections of the pipe 20 are screwed, and is diagonally drilled from the bore, 25 outwardly with a number of small water-spraying jet orifices 26 arranged in a circular series. Said casting is also longitudinally formed with a corresponding number of air-induction passages 27 having flared outlets 28 into which the jet openings 26 discharge, and is further provided with a splash-hood or baflle 29 against which a portion of the spreading water-jet from each of the outlets 26 may impinge to assist in the spraying action. I

I have further shown sleeves 30 with tapered ends mounted upon the water-pipe 20 posterior to each of the first and second ejector devices 23, and extending-between it and the next ejector device, to act as partial fillers or stream guides for reducin the free space within the chamber '16 and orming a relatively narrow channel adjacent the'walls of said chamber'forthe passage of the mixture of air, water-spray, and water-vapor. Any suitable number of these sleeves could be employed adjacent the successive ejector .de-

vices and they could be made to act as the water-pipe sections between said devices or could be omitted.

In the operation of this apparatus, the water jets from the openings 26 are slantingly discharged in spray form upon the walls of the chamber 16, and the water partially collects in a thin film which bathes said walls and abstracts the heat therefrom by 10 conduction and evaporation, thus serving to keep the temperature of the roll at a point suitable for the working of the stock which is subjected to the action of the rolls. The evaporation and refrigerating effect is con- 35 siderably enhanced by the intimate intermixture of the finely-divided water particles with the air supplied through the passages 27 of each ejector 23 and with the air passing I around said ejector devices, as well as by the Q passage of the air current, induced by the action of these ejectors, over the film of water collecting on the walls of the chamber 16, said air current being thus forced through the roll and constantly renewed as fast as 2 it becomes saturated with water-vapor. I am thus enabled to dispense with artificial pre-cooling of the water supply for the millrolls, which has heretofore been an item of considerable expense, to reduce the quan- 3 tity of water employed for a given cooling effect and to dispense with any ower for the cooling apparatus other than t e head of a gravity supply or a pumpedsupply of water.

as. Inth difi t' h 'F'.4th

6 mo ca Ion S own In 1g e my hand this th day of November, 1928.

inner side of the walls of a mill-roll 13 havin an interior chamber 16 are cooled with a of water from a series-of radial-spraymill-roll which comprises supplying water in the form of a film to substantially the en- 'tire inner periphery of the roll walls, in relatively small excess over the evaporative capacity of said walls, and forcing a current of slightly compressed air longitudinally through the roll to assist the evaporation of said water film.

4:. A mill-roll cooling apparatus comprising, in combination, a mill-roll formed withan interior chamber having a free outlet substantiallyas large in diameter as the chamber, means for spraying water into said chamber against the walls thereof, and an air inlet at the end of said chamber opposite said outlet.

5. A mill-roll cooling a aratus comprising, in combination, a hol ow mill-roll, an air ejector on the interior of said roll having its outlet slantingly directed against the iImer side of the roll-walls, a water-spray outlet included in said ejector, an air inlet to the ejector, a water pipe for supplying the ejector, and anair, water and vapor outlet from the roll.

In witness wheerof I have hereunto set KARL' B. KILBORN.

ing jet devices 31 mounted on an axial water- 40 pipe 20, and an air current is. forced longitudinally through said chamber, with substantially the same evaporation efiectas above described, by means of a fan blower 32 whose outlet-pipe 33 telesco es within the air-inlet 46 passage 19 of said r0 1.

Various other modifications could be made without departing from the spirit of my invention as defined in the appended claims.

For example, the air-current could be employed as described for evaporatin a spray or film of water in the interior 0 j an ordinary mill-roll having a free outlet of smaller diameter than the interior chamber, which retains a 001 of water in the lower part of 65 said chain r; in which caseth'ere would be an enhanced cooling effect as compared with the ordinary water injection employed with such rolls, though not as great an improvement as where the entire inner surface is ex- '60 posed for evaporation as herein described.

. Lclaim:

:1. The method of cooling a heated, hollow mill-roll which comprises spra 7 g water into the interior of said roll an forcing 65 a current of slightly compressed air there-

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