US1030865A - Rolling-mill. - Google Patents

Description

J. H. BLAKESLEY.

ROLLING MILL.

APPLICATION FILED JULY 20, 1911.

hmmfififim Patented July 2, 1912.

Q I q @a W/7 W 4 5 1770 I? an enrich JoHN HOLMES BLAKESLEY, or LoNnou, ENGLAND.

ROLLING-MILL.

Specification of Letters Eatent.

Patented ma 2, 1912.

Application filed July 20, 1911 Serial No. 639,554.

To all whom'c't may concern:

' Be it known that 1, JOHN HOLMES BLAKES- LEY, subject of the King of England, residing at London, in England, have invented certain new and useful Improvements in Rolling-Mills, of which the following isa specification.

This invention relates to mills for rolling metals, fiber or other materials, and has for its object to render the rolls more resilient, less liable to become broken and to overcome the results of such an occurrence.

Hitherto the rolls of certain types of such mills have been provided with rams usually actuated by water or other liquid under pressure so as to allow the rolls to yield if any foreign body of excessive magnitude or hardness occurs in the material being rolled. Such arrangements have been deficient in resilience and moreover necessitate the employment of a separate pump and accu1nulator for each standard of rolls. 1

According to this invention air supplied under pressure. acts directly ,on ashallow layer of liquid which transmits the pressure to the rolls through a ram, but is of such small total mass as not seriously to diminish the resilience of theair by liquid friction.

This layer of liquid feeds the backings of the ram and serves other objects hereafter described. A reservoir or accumulator is provided for the compressed air of a sulficient size to prevent dangerous increase of pressure when the rolls are lifted,'and an air compressor is employed to maintain the necessary pressure. In this manner a more even pressure is maintained on the rams and rolls, and greater resilience is obtained than has hitherto been possible, so; that the rolls are readily and quickly returned to their normal position after being forced apart.

Considerable saving is effected in the piping between the rams and the accumulator, as, owing to the small resistance to the flow of gas, piping of smaller diameter can be employed than in the case of hydraulic rams, this piping being not only cheaper but stronger. 1 Further, for the same reason, the pipes may be of greater length so that the same compressor serves a large number of rolls. i

In the acompanying drawing, one 1 form of apparatus constructed in accordance with this invention is diagrammatically illus trated, in which A is the center of theupper roll in a mill and B a ram pressing downward on the bearing C of the roll A. The ram B is mounted in a cylindrical cavity forming a rammzhalnbr D,v and a narrow neck or conduit establishes communication between the ram chamber and an intermediate chamber or reservoir E disposed above it. From the upper end of the reservoir E piping leads to the reservoir or accumulator F for the compressed air, and further to the compressor, which is not shown, as the type thereof may vary and forms no part of the present invention. The

chamber E constitutes a liquid reservoir and is of suflicient size to contain all the liquid behind the ram so that none of this can be forced into the small tubing connecting the liquid and air reservoirs when the ram rises.

A' float G is suspended by a spring within the reservoir E from the upper end thereof andthe bottom of the float fits into a seating formed at the upper end of the conduit connecting the liquid reservoir and ram chamber D so that when the float descends far enough it will form avalve and shut olf communication'between the liquid reservoir and ram chamber. The spring is strong enough tohold up the float G against the flow of liquid when the ram is normally falling after a rise, but should the ram chamber D be reduced to atmospheric pressure by the breakage of a roll, bearing or standard, or some other accident, the flow of the liquid from the reservoir E, and the fall of its surface level, will cause the float to sink and close the valve, thus preventing the escape of the compressed air, and the danger resulting therefrom. The reservoir E is provided with a pipe which com1nunicates with the upper and lower ends thereof having in its course two cocks H, H, which serve as gage cooks for observing and controlling ,the level-of the liquid in the reservoir E, the arrangement being similar to that employed with steam generators. One or more valves, as I, may also be, provided near the air compressor to prevent the escape of air in the case of accident to this, so that the mills will continue to work for some time Without further addition of air.

It will be understood that by suitably curving the conduit connecting the liquid reservoir and the ram chamber, pressure may be applied vertically or obliquely, in an upward or downward direction, or horizontally, so that, without departing from this invention, the arrangement is equally applicable to a bottom or a side roll in any position, though it is here only represented as applied toahorizontal or top roll. Althou h compressed air has been described as ,t e fluid which .maintains the necessary pressure, it will be understood that any inert gas which does not condense at ordinary to shut off the supply of compressed air to the ram chamber when the pressure therein falls as and for the purpose set forth.

2. In a rolling mill the combination with a ram actuated by air or gas supplied under pressure of a liquid reservoir mounted between and communicating with thesou-rce of pressure and the ram chamber and a float valve in the reservoir adapted to shut 011' the supply of compressed airwhen the liquid escapes from the ram voir as set forth. p

In testimony whereof I have signed my chamber and .resername to this specification in the presence of two subscribing witnesses.

JOHN HOLMES. BEAKESLEY.

Witnesses MA RICE STRODE, FRANK' GonwrN.

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