MXPA99007337A - Roller assembly vol - Google Patents

Abstract

A rolling train assembly includes a support shaft having a tapered section from a stop to a final section. A ring-shaped roller having inner and outer sides and a cylindrical bore is axially mounted on the arrow with its inner side seated against the stop and with its cylindrical bore surrounding the tapered arrow section. A tapered sleeve is interposed between the tapered shaft section and the cylindrical bore of the roller. A circular detent is received axially in and rotatably fixed with respect to the thin section of the arrow. A nut is screwed into the final section of the arrow to operate via the retainer to center the roller on the arrow by tightly inserting the sleeve between the tapered shaft section and the cylindrical roller bore. Screw members are threaded through the retainer in axial engagement with the outer side of the roller to drive the inner side of the roller against the

Description

ENSAM BLE DE RODI LLO VOLADO BACKGROUND OF THE I NVENTION 1 . Field of the invention This invention relates generally to roller mills, and is related in particular to an improved "flipped" type roller assembly, where ring-shaped work rolls are mounted on the ends of arrows of driven roller. 2. DESCRITION OF THE PREVIOUS ICA TECHNIQUE In the typical roll-to-roll assembly, a ring-shaped roller has a cylindrical bore received in a tapered section of an arrow supporting a driven roller. A tapered sleeve is inserted in wedge engagement between the tapered roller shaft section and the cylindrical roller bore. In some cases, the wedge coupling of the sleeve serves as the primary means for transmitting torque from the arrow of the roller to the roller. In other cases, the tapered sleeve serves mainly as a centering device, with a torque that is transmitted from the arrow of the roller to the roller by another means, v. g. , through keys or other similar mechanical links, or by means of hydraulically loaded adjacent components of the roller assembly against the sides of the roller to transmit torque by frictional contact.

When the tapered sleeve serves as the main torque transmission component, it exerts substantial radial force on the roller. The roller must therefore be radially engrusted in order to provide the resistance required to withstand the resultant increased hoop stress. The increased thickness of the roller is accommodated by a reduction in the diameter of the shaft which disadvantageously reduces the stiffness of the shaft. The loading of the tapered sleeves or other torque transmitting components of conventional roller assemblies is typically achieved by specially designed hydraulically driven tools. Such tools are expensive and extremely heavy, which usually require maintenance personnel to employ forklifts when coupling and uncoupling the tools from the roller assemblies. The non-productive shutdown of the mill is prolonged as well because most facilities have only a limited number of forklifts available for use by maintenance personnel. An object of the present invention is to provide a flown roller assembly in which the tapered sleeve serves primarily as a centering device, with a torque that is transmitted from the arrow of the roller by other components of the roller assembly in contact with the roller. friction with the sides of the roller. The forces of the roller ring are thus advantageously reduced, making it possible to achieve a corresponding reduction in roller thickness and a beneficial increase in the diameter of the shaft.

An accompanying object of the present invention is the provision of a simple mechanically driven arrangement for axially loading the components of the roller assembly that transmit the torque acting in frictional contact with the sides of the roller. This is achieved through the use of low-cost lightweight tools that can be employed by maintenance personnel without resorting to ancillary equipment such as expensive forklifts.

BRIEF DESCRIPTION OF THE INVENTION In a preferred embodiment of the invention to be described hereinafter in greater detail, the above objects and advantages are achieved by the rotationally fixing of a reciprocating circular retainer axially adjacent to both the outer side of the roller in the form of a ring and the outer end of the tapered sleeve, the latter having been inserted loosely between the tapered section of the roller shaft and the cylindrical bore of the work roll. Then a nut is screwed into the end of the arrow. The nut acts against the circular retainer, which in turn bumps and urges the tapered sleeve into a centering position inserted tightly between the tapered shaft section and the cylindrical bore of the roller. Screw jacks threaded through the retainer are then pressed against the outer side of the roller to anchor the inner side of the roller against an adjacent stop, which will typically comprise a circular shoulder of elongated diameter in the arrow of the roller. The frictional contact resulting from the screw jacks and arrow stop with the opposite roller sides serves as the main torque transmitting means. Preferably, the circular retainer is axially coupled to the tapered sleeve by means of a bayonet connection or the like. Thus, the removal of the nut followed by continuous tightening of the screw jacks will result in the removal of the tapered sleeve from its tightly inserted centering position, thereby releasing the roller for removal of the roller shaft. These and other objects, aspects and advantages of the present invention will now be described in greater detail with reference to the accompanying drawings, wherein: BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a longitudinal sectional view taken through a roller assembly according to the present invention; Figure 2 is an end view of the roller assembly focused from right to left in Figure 1; Figure 3 is a partial cross-sectional view taken along the line 3-3 of Figure 1; Figure 4 is an exploded view of the roller assembly; and Figure 5 is a view similar to Figure 1 showing the components of the roller assembly in a sleeve extraction mode.

DETAILED DESCRIPTION OF PREFERRED MODALITIES Referring now to the drawings, a roller arrow 10 has a tapered section 10a leading from a stop in the shape of a circular shoulder 10b to a final section 10c of reduced diameter having a threaded end 10d. A ring-shaped roller 12 has internal and external sides, 12a, 12b and a cylindrical perforation 12c. The roller 12 is mounted axially on the arrow 1 0, with its inner side 12a seated against the shoulder shoulder 10b and with its cylindrical bore 12c surrounding the tapered arrow section 10a. The arrow 10 is provided with a journal for rotation in a housing 1 1 by means of bearings, one of which is represented at 13. An "S" seal assembly serves to retain lubricant in the housing while excluding externally applied cooling water. . A tapered sleeve 14 is interposed between the arrow section 10a tapered and the cylindrical perforation 12c of the roller 12. The outer end of the sleeve includes a collar with a circular groove 14a located inwardly of spikes 14b projecting outwards radially radially circumferentially. A circular roller retainer 16 is received axially in the final section 10c of the arrow. The retainer is axially movable, but is rotatably fixed with respect to the arrow 1 0 by any convenient means, for example by inward projecting keys 16a received in key slots 10e in the section 10c of the arrow. The retainer 16 is grooved internally as in 16b adjacent the circumferentially spaced inwardly projecting pins 16c. As best seen in Figure 3, the pins 16c are configured and arranged to coact in a bayonet-type mechanical interengagement with the pins 14b of the sleeve 14 to axially couple the retainer to the sleeve. A nut 18 is threaded in the final threaded section 10d of the arrow. The nut is operative via the retainer 16 for tightly inserting the sleeve 14 between the tapered arrow section 10a and the cylindrical roller perforation 12c, with which the roller 12 is centered. on the arrow 10. With the nut thus tightened, the outer roller side 12b and the adjacent inner face of the retainer 16 will be either in face-to-face contact, or there may be a slight gap between them as indicated in 20 in the Figure 1 . Screw jacks 22 are threaded through the retainer 16 in axial coupling with the external side 12b of the roller 12. As the screw jacks are tightened, the inner side 12a of the roller is urged against the arrow stop shoulder 10b, and the stopper 16 is confined against movement in the opposite direction by the nut 18. The opposing axial forces exerted on the sides 12a, 12b of the roller by the shoulder shoulder 10b and the screw jacks 22 generate the frictional forces required to transmit torque from the arrow 1 0 of the roller via the retainer 16 to roller 1 2. As can best be seen by reference to Figure 5, The removal of the roller is easily accomplished by first removing the nut 18 and then continuing to tighten the screw jacks 22. This will force the retainer 16 away from the outer side 12b of the roller, with an accompanying withdrawal of the sleeve 14 tapered as a result of the mechanical interengagement of the detent pins 16c with the pins 14b of the sleeve. In light of the above, it will now be appreciated by those skilled in the art that the present invention offers a number of significant advantages over conventional roller mounting assemblies. For example, the paper of the tapered sleeve 14 is mainly restricted to centering the roller 12 on the tapered arrow section 10a. As a result, the roller is subject to only moderate hoop efforts. The designer can thus reduce the roll thickness, with a corresponding beneficial increase in arrow diameter. The lower ring stresses also result in rollers 12 and sleeves 14 having longer service lives. The sleeve 14 is seated in its operative position simply by tightening the nut 1 8. This can be achieved by mill personnel using relatively inexpensive light weight normal pneumatic nut wrenches. The torque is transmitted mainly by the force of the opposing frictional forces generated axially on the sides of the roller. These forces are developed by simply tightening the screw jacks 22, which can be accomplished again with normal pneumatic wrenches. The same tools can be used to extract the tapered sleeve 14 during the removal of the roller. Various changes and modifications can be made to the modality in the present one chosen for description purposes. By way of example only and without limitation, the retainer 16 may be rotatably fixed to the arrow 10 by other known and functionally equivalent countermeasures, such as flat machining co-actuator surfaces in the arrow section 10c and the inner bore of the catch. Separating rings or the like can be interposed between any of the axially arranged components, v. g. , between the shoulder 10b and the inner side 12a of the roller, between the outer side 12b of the roller and the retainer 16, etc. It is my intention to cover these and any other mechanically and functionally equivalent changes and modifications that do not depart from the overall concept of the present invention as defined by the claims appended hereto.

Claims (9)

1. REVIVAL NAME IS 1. A rolling train roller assembly comprising: a supporting arrow having a tapered section going from a stop to a final section; a ring-shaped roller having inner and outer sides and a cylindrical perforation, said roller being mounted axially on said arrow with its inner side seated against said stop and with its cylindrical perforation surrounding the tapered arrow section; a tapered sleeve interposed between the tapered arrow section and the cylindrical perforation of said roller; a circular retainer received axially in and rotatably fixed with respect to the final section of said arrow; a nut threaded into the final section of said arrow, said nut being operative via said detent to center said roller on said arrow by tightly inserting said sleeve between said tapered arrow section and the cylindrical roller bore; and screw members threaded through said detent in axial engagement with the outer side of said roller to drive the inner side of said roller against said stop. The roller assembly of claim 1 further comprising coupling means for axially coupling said retainer to said sleeve. 3. The roller assembly of claim 2 wherein said coupling means comprises spikes spaced circumferentially in said sleeve which co-act in mechanical interengagement with the spikes circumferentially spaced in said detent. 4. The roller assembly of claim 1 wherein said circular detent is interposed axially between and bounded by both said sleeve and said nut. The roller assembly of claim 2 wherein a loosening of said nut followed by tightening said screw members will act via said detent to axially extract said sleeve from said arrow and said roller. The roller assembly of claim 1 wherein said screw members are engageable with the outer side of said roller in circumferentially spaced locations. The roller assembly of claim 1 wherein said stop comprises a circular shoulder of enlarged diameter in said arrow. A rolling train assembly comprising: a supporting arrow having a tapered section located between a stop and a reduced diameter end section; a ring-shaped roller having inner and outer sides and a cylindrical perforation said roller being received axially in the tapered section of said arrow; a tapered sleeve interposed between the tapered section of said arrow and said roller, said arrow having an outer end projecting axially from the outer side of said roller; a circular retainer received axially in the final section of said arrow at a location adjacent to the outer end of said sleeve and axially spaced from the outer side of said roller; first half threaded in the final section of said arrow to axially drive said detent towards the outer side of said roller and to urge said sleeve to tight insertion between the tapered section of said arrow and the cylindrical perforation of said roller; and second means threaded through said retainer to axial coupling with the external side of said roller to axially drive the inner side of said roller against said stop. 9. A rolling train roller assembly comprising: a supporting arrow having a tapered section extending from a stop to a final section; a ring-shaped roller having inner and outer sides and a cylindrical perforation, said roller being mounted axially on said arrow with its inner side seated against said stop and with its indic bore bore surrounding the tapered arrow section; a tapered sleeve interposed between the tapered arrow section and the indian cylinder bore of said roller; a circular retainer received axially in and rotatably fixed with respect to the final section of said arrow; coupling means for axially coupling said retainer with said sleeve; a threaded nut in the final section of said arrow, said nut being operative via said detent for centering said roller on said arrow by tightly inserting said sleeve between said tapered arrow section and the cylindrical roller perforation; and screw members threaded through said retainer to axial assembly with the outer side of said roller to drive the inner side of said roller against said stop, wherein a loosening of said nut followed by tightening said screw members will act via said retainer for axially extracting said sleeve from said arrow and said roller. SUMMARY A rolling mill assembly includes a support shaft having a tapered section from a stop to a final section. A ring-shaped roller having inner and outer sides and a cylindrical bore is axially mounted on the arrow with its inner side seated against the stop and with its indic bore bore surrounding the tapered arrow section. A tapered sleeve is interposed between the tapered shaft section and the cylindrical bore of the roller. A circular detent is received axially in and rotatably fixed with respect to the final section of the arrow. A nut is threaded into the final section of the arrow to operate via the retainer to center the roller on the arrow by tightly inserting the sleeve between the tapered shaft section and the cylindrical roller bore. Screw members are threaded through the retainer in axial engagement with the outer side of the roller to drive the inner side of the roller against the stop.