US2953952A

US2953952A - Apparatus for cleaning rolls

Info

Publication number: US2953952A
Application number: US568466A
Authority: US
Inventors: George O Alexander
Original assignee: Kaiser Aluminum and Chemical Corp
Current assignee: Kaiser Aluminum and Chemical Corp
Priority date: 1956-02-29
Filing date: 1956-02-29
Publication date: 1960-09-27
Anticipated expiration: 1977-09-27

Description

Sept. 27, 1960 Filed Feb. 29. 1956 24 t 0 1 a o 6 APPARATUS FOR CLEANING ROLLS 7 Sheets-Sheet 1 l8 INVENTOR GEORGE O. ALEXANDER BY w6 Z ATTORNEY Sept. 27, 1960 G. O.-ALEXANDER 2,953,952

- 1 APPARATUS FOR CLEANING ROLLS Filed Feb. 29, 1956' I 7 Sheets-Sheet z INVENTOR GEORGE 0. ALEXANDER E WW ATTORNEY P 27, 1960 G. o. ALEXANDER 2,953,952

APPARATUS FOR CLEANING ROLLS Filed Feb. 29. 1956 7 sheets-sheet :5

co '3 K Mpg- AW 3 T g u 2 a .0 I i u m a 9 IN VENTOR GEORGE o. ALEXANDER ATTORNEY P 1960 G. o. ALEXANDER 2,953,952

APPARATUS FOR CLEANING ROLLS Filed Feb. 29, 1956 7 Sheets-Sheet 4 ATTORNEY INVENTOR GEORGE O. ALEXANDER Sept. 27, 1960 G. o. ALEXANDER 5 APPARATUS FOR CLEANING ROLLS Filed Feb. 29, 1956 v 7 Sheets-Sheet 5 ATTORNEY Sept. 27, 1960 5. 0. ALEXANDER 2,953,952

APPARATUS FOR CLEANING ROLLS Filed Feb. 29. 1956 7 Sheets-Sheet 6 wil IN VENTOR GEORGE O. ALEXANDER v ATTORNEY Sept. 27, 1960 G. o. ALEXANDER APPARATUS FOR CLEANING ROLLS 7 Sheetls-Sheet '7 mm mm Filed Feb. 29. 1956 p .Lmuu

ATTORNEY United States Patent ice 2,953,952 APPARATUS FOR CLEANING ROLLS" George 0. Alexander, Ravenswood, W. Va, assignorio Kaiser Aluminum 8: Chemical Corporation, Oakland, Calif., a corporation of Delaware Filed Feb. 29, 1956, Ser. No; 568,466 4 Claims. (Cl. 80-1) This invention relates to rolling mills for theproduction of metal plates, sheets and the like and to means for cleaning the roll surfaces thereof. More particularly, this invention relates to means for controlling the force exerted by the cleaning means on the roll surfaces.

Heretofore, it has been the usual practice to provide such cleaning means with some mechanism for manually controlling the forces exerted by such means on the work roll surfaces such as spring and screw means. Such practice possesses certain inherent; disadvantages particularly with regard to the exertion of unequal forces throughout the axial length of the cleaning means, The prior art mechanisms, beingofa manually adjustable type, did not provide adequate adjusting characteristics. The operators, while adjusting the forces at each end of the cleaning means were unable to exactly ascertain the amount of adjustment necessary on each extremity. Manifest'ly, in the event the operators tightened down on the mechanism at one end of the cleaning means slightly more than the mechanism at the opposite endof the cleaning means a greater force would 'be applied to the working rolls at one end than at the other; thereby 'ultimately resulting in a correspondingly greater wear or one portion of the working surface of thecleanin'g fl'neans than at other portions. It Will be obvious'that :such uneven wear would necessitate more frequent replacements of the cleaning means and acorrespondingly greater amount of lost time for the entire'rollin'g mill .of which the instant invention is an integral part.

Accordingly, it is the general object of the inst-antinvention to avoid and overcome the foregoing'and other difliculties of and objections to known clearing means :adjusting mechanisms by the provision of an improved :mechanism for hydraulically controlling the forc'es applied by the cleaning means to the working roll surfaces *whereby such forces are equal throughout the entire raxial lengthof the workingrolls.

Another important object of "the invention ;is to :pro-

duee an 'automatic lhydraulic'allycontrolled cleaning roll 2-incombination with the Working rollof a rolling) mill. A furth'er object of the inve'ntionyis reproduce-whyvdra'ulically controlledmechanism forcontrolling the force iexertedfb'y the'cleaning means of a rolling mill avhich may be" readily zandeconomically manufactured.

5 Still another object of the einventioniis'ito :produceahydraulica'lly actuated meansto selectively control -.the ionigagement pressure at. either end :of. a cleaning ,meansxof iafrdlling :mill :in contact with-an associated zworkingrroll dn sucha manner th'atztheaforce exertedby said cleaning :means :on said working' Io'llsis I equal .throughoutzthevcntire enga'ging or contacting: surface. ,7

Ast'ill' further objectiof 'thCiillVfiIltiOIlflSitG produceahydraulic system for laselectively -..controllingethe :.forc.e:.-exaertediby'za cleaning im'eansof :a rollingi milllfor trolling rmetal wliich may the. appliedcto existing roll-ingmills with 'riaimiriimumahtbunttdfefiortxaiid costi LThese: and'aothernobjfects iofthe iiinviention whichyvill -:.-become apparentztfrom-a reading of the'idescription of the;

Patented Sept. 27, 1960 2 V invention as set forth in detail hereinafter areachieved by the provision in a rolling mill, the combination ofa base frame, a pair of cooperating positively driven worltf ing rolls journaled in said frame, a cleaning means inas s ociation with each of said Working rolls, a of hy-i draulically operated extensible members for each of said cleaning means and a hydraulic system for effecting ,ing material 28 covering .the outer peripheryt v {The cleaning material .28 may be. comprised of grqups :of radiallylextending bristles .ofsuitable m ate aszmetal, plastics, fibenl etc {which act torj e V -=t 0 the upright sections 14 of the ,frame 10 and movement of said hydraulic cylinder with respect tosaid piston-like member, whereby the contact pressure between said cleaning rolls and said working rolls ateither end of said cleaning means may be selectively controlled. Figure l is a side clevational view with a portion there.- of shown insection-of one stand of a rolling mill ineorporating the instant invention wherein a rotating brush typev cleaning means is employed. e V V Figure 2 is a frontelevational view, partly in section, of the mill standof Figure l. I

, Figure 3 is an enlarged sectional view taken alongline 33 of Figure 2 with portions thereof shown insection, Figure 4 is a sectional view of the invention taken alongj line 44 of Figure 3. p Q "Figure 5 is a sectional view of the cleaning roll drive assembly taken along line 5 5 of Figure 4.

Figure 6 is a side 'elevational view, with a portion there- 7 of shown .in section of one stand of a rollingniill invcooperating the instant invention wherein a stationary type cleaning means is employed. 7

Figure 7 is a schematic illustration of the hydrauliti actuating circuit. V v 7 a j a With partieularreference to Figures 1 ;and-2, thene shown the general arrangement of one stand ,of ,a polling mill having a baseframe 10 supporting a pair of cooper,- :ati g Working rol s 2.- e worm-151011.812 a e i ;nal ed in suitable bearings (not shown) [disposed wit U the uprigh e o :1 ;o t e f am :10- Su tab e, :mot'ors (not shown) .areprovided to impart rotary zrnotion' to the working rolls 12, The power from these such ,amanner that the peripheral surface ar a a e qup roll- 18 is in positive contact with itsassociatedworking roll 12 1and serves to reduce the deflection .of the:

working; roll from the loads encountered in' rolling metal.

A substantially horizontaltable 22 .iss'uitably .-vided with a. stripper 23 at one end in close proximity to the lower working rolls 1 2,,and a :pluralityof rollers 2 4. }It fV/lll ,be readily .apparent that .the ,m11ers, 2 4 vide a support for the metal stock whieh is causejdto pass between and be flattened by the cooperating pair of work- .ing rolls 12. A secondstr'ipper 25"is providefdi'niclose proximity to' the upper working roll 12. Strippers- 23 and 25 are provided to remove the rolled metal from the working rolls '12 to which it'tends to adhere."

i Suitable cleaning --means or devices are -provid'ed, one v for each ofthe working rolls 12. Such cleanin'g' means -may be either -a rotating type as 'shown iin zFiguresil through 5 or a stationary type as shown in Eigurekfi.

With reference to Figures;1,-2 and,3 saidl-cleaning means M comprises :a pair :of cleaning rolls :26 adapted to be in contact with the outer peripheral surface of ,the Orking :rolls' 12. =Said cleaning ,rolls" 26 :have ya suitable "3 foreign material which may become adhered to the work contacting surface of the working rolls 12. The cleaning rolls 26 are adapted to be driven from suitable motors 16 through a suitable flexible power transmitting apparatus. In an embodiment of this invention shown in Figures 1 through 5 such apparatus includes an angle drive assembly 30; an extensible telescoping a cleaning roll drive assembly 36. For purposes of simplicity, the operation will be described in connection with and specific reference will be made only to the lower cleaning roll 26 and its drive assembly. It is understood that the upper cleaning roll 26 and its associated drive is substantially identical with the lower one.

Drive motor 1-6 is suitably mounted on the roll stand base frame and is coupled to the angle drive assembly 30. The angle drive assembly 30 may be of any of the conventional types such as for example the gearing arrangement shown in Figure 25, page 12 of Five Hundred and Seven Mechanical Movements by Henry T. Brown, 21st ed., 1908, pub. by Brown & Seward, 216 Broadway, New York, NY. The output shaft of the angle drive assembly 30 is coupled to the cleaning roll drive assembly 36 through a universal joint 34, telescoping shaft 32, and a second universal joint 35. The telescoping drive shaft 32 is comprised of an inner and an outer member so arranged as to transmit positive rotary motion while being capable of extension or contraction.

As shown in Figure 5, the cleaning roll drive assembly 36 comprises a shaft 38, one end of which is coupled to the second universal joint 35 and mounted on bearings 40. The other end of the shaft 38 is provided with a bevel gear 42. The bevel gear 42 is adapted to mesh with and in turn drive a second bevel gear 44 which is mounted on and suitably keyed to an intermediate shaft 46 which is rotatably supported by bearings 48. A spur gear 50 is also mounted on and suitably keyed to the shaft 46. The spur gear 50 is adapted to mesh with and drive an associated spur gear 52 which is integrally mounted on the axle 54 of the cleaning roll 26. It will be noted upon examination of Figure 5 that the axle 54 of the cleaning roll 26 is journalled or rotatably supported by bearings 56 and 57. The entire cleaning roll drive assembly 36 may be suitably covered by a housing 58, as clearly shown in connection with the Figures 3 and 4. Referring to Figures 3 and 4, it will be seen that the entire cleaning roll drive assembly 36, including the cleaning roll axle 54, is supported by a sliding member 60 which in turn is supported between a pair of

guide rails

62 and 64. The guide rails 62 and 64 are disposed beneath the horizontal table 22 and suitably secured to the base frame 10. It is to be understood that the member 60 is adapted to slide along a longitudinal axis between the guide rails 62 and 64.

The member 60 is provided with a cylindrical recess 66 adapted to receive a piston 68. Near one of the terminal portions of the piston 68, there is formed an annular recessed groove 70 adapted to receive'a hydraulic packing 72. The hydraulic packing 72 fits snugly against the inner surface of the recess 66 and provides a fluid tight seal between the piston 68 and the recess 66. The extreme terminal portion of the piston 68 is provided with a projection 74 of reduced diameter to provide an annular space for hydraulic fluid even when the piston 68 has fully penetrated into the cylindrical recess 66. The terminal portion of piston 68 opposite the projection 74 has a cylindrically concave surface 76 provided to mate with a mating convex cylindrical end portion 78 of a restraining member 80. The opposite extremity or terminal portion of the restraining member 80 has an aperture 82 formed therein. A removable pin 84 is provided to fit through apertures formed in the guide rails 62 and 64 and through the aperture 82. straining member 80 is prevented from moving in a direction away from the piston 68 and likewise, thepis O l shaft 32; and' 68 is prevented from moving in a direction toward the apertin'e 82.

The sliding member '60 is provided with a fluid receiv ing fitting 86 which is adapted to form a portion of the conduit for the fluid to be passed to the cylindrical recess 66. Thus, when oil or otherhydraulic fluid is forced into the opening between the inner wall of the cylindrical recess 66 and the projection 74 of the piston68, the

latter being rigidly fixed against longitudinal movement, the pressure exerted by the incoming fluid will cause the sliding member 60 and its associated axle 54 of the cleaning roll 26 to move toward its associated working roll 12 of the mill stand.

With particular reference to Figure 3, it will be seen that the opposite terminal portion of the cleaning roll axle 54 from that described hereinabove is supported by suitable bearings 88 which in turn are carried by a sliding member 90 similar to the sliding member 60 of the cleaning roll drive assembly 36. The slide member 90 is provided for sliding engagement between a pair of

guide rails

92 and 94, similar to the guide rails 62 and 64 mentioned hereinabove. The sliding member 90 is provided with a cylindrical recess 96 in the end portion Thus, the rethereof. A piston 98, similar to piston 68, is received within the recess 96 and a restraining member 100 similar to the restraining member is employed in conjunction therewith. The sliding member is provided with a fluid receiving conduit provided for the passage of fluid into the cylindrical recess 96. It is to be understood that the sliding assemblies for supporting and effecting the sliding movement of both terminal portions of the cleaning roll axle 54 are essentially the same.

The operation of the piston 98, the sliding member 90, and the restraining member is substantially the same as the operation of the corresponding elements acting on the opposite end of the cleaning roll axle 54, such that when fluid is forced into the cylindrical recess 96 through the fluid receiving fitting 102, the respective end of the cleaning roll 26 is moved toward the working roll 12.

Manifestly, in light of the above description, it is readily discernible that movement of either or both ends of the cleaning roll axle 54can be elfected by forcing a hydraulic fluid into the respective

cylindrical recesses

66 and 96, through the

fittings

86 and 102, respectively. For purposes of clarification it is to be understood that a description of the upper assemblies for effecting movement of the cleaning rolls toward their associated working rolls is not deemed necessary inasmuch as the apparatus and operation thereof is substantially identical with that described above.

While rotating type cleaning means have been shown and described above it is to be distinctly understood that stationary type cleaning means may be employed. With reference to Figure 6 said stationary cleaning means comprises a pair of stationary cleaning members 27 adapted to be in contact with the outer peripheral surface of the working rolls 12. Said cleaning members 27 may comprise a channel type member 29 of a suitable material preferably metal, and having a contact member such as a wooden board or plank 19 contained therein. Such wooden board or plank 19 may be applied directly to the surface of the working rolls 12 or a suitable bufling of cleaning material may be applied to said wooden board or plank 19. In lieu of a wooden board or plank a suitable stationary brush means could be employed for contacting the surface of working rolls 12. Such brushes may be fabricated of any suitable material such as metal, plastic, fiber, etc., which act to remove any foreign material which may become adhered to the Work contacting surface of the working rolls 12. One end of cleaning member 27 may be supported by a sliding member 60 which in turn is supported between a pair of

guide rails

62 and 64. The guide rails 62 and 64 are disposed beneath the horizontal table 22 and suitably secured to the base frame 10. It is to be understood that the memconcave surface provided-to mate with a mating convex cylindrical end portion of a-"restrarning member 80, identical to the rest-raining ni'erfiber'80= shown-in Figures 1 through 5.. Restraining member 80' is 'mbunt'ed-within guide rails 62 and 64111 the samernanner as" previsusr described in connection with theembodinient o'f tl'iis'invention shown in' Figures through '5. The opposite end of stationary cleaning member 27 is supported by' asliding member similar to sliding member 90 ofthe previously described embodiment which sliding member is supported and operated in the manner'asdscr-ibed above. The operation'of the sliding member 60' and the sliding member similar to member 90' is substantially the same as the operation of the corresponding elements described above in connection with the embodiment shown in Figures 1 through 5, such that when fluid is forced into the cylindrical recessesthroughthefiuid receiving fittings the respective end of the stationary cleaningmember is moved toward the Working roll 12.

As can be seen from the drawings,

guide rails

62, 64, 92 and 94 are mounted'on their respective upright sections 14 independently from horizontal table 22 and stripper 23. Similarly, the upper guide rails 62' and 64' are mounted on upright sections 14 independently from stripper 25'. In practice'guide rails or guiding

members

62, 64, 92 and 94 may be mounted on horizontal table 22, while upper guide rails or guiding

members

62 and 64 may be mounted on stripper 25, however,.independent mountings are preferable.

Operation of the cleaning means of this invention, e.g. cleaning rolls 22, or stationary cleaning members 27 results in wearing down the cleaning material whereby periodic replacement becomes necessary. With particular reference to Figures 3 and 4 the method for removing cleaning rolls 26 involves first removing pins 84 and 103. Restraining

members

80 and 100 may then be removed permitting sliding

members

60 and 90 to be moved along

guide rails

62, 64, 92 and 94 away from working rolls 12. By continuing the movement of

slidingmembers

60 and 90 past the end of

guide rails

62, 64, 92 and 94 furthest removed from working rolls 12, e.g. the left end as shown in Figure 1, sliding

members

60 and 90 and the associated cleaning roll 26 may be removed from the rolling mill. The worn cleaning roll 26 may then be easily removed from sliding

members

60 and 90 and replaced by a new cleaning roll 26. By reversing the above

procedure sliding members

60 and 90 may be engaged in

guide rails

62, 64, 92 and 94, restraining

members

80 and 100 replaced and pins 84 and 103 replaced.

While replacement of cleaning rolls 26 of the embodiment of this invention shown in Figures 1 through 5 has been specifically described above it is to be understood that stationary cleaning members 27 of the embodiment shown in Figure 6 may be replaced in the same manner.

Attention is now directed to Figure 7 which illustrates a suitable hydraulic system for effecting the desired control and adjustment of the cleaning rolls 26 relative to their associated working rolls 12. The hydraulic circuit is described only in connection with one of the rolling mill stands, the circuits for the other stands being sub- 7 stantially identical thereto. A'pump 104 driven by a motor 105 is provided to pump a hydraulic fluid contained within a fluid reservoir 106 through a fluid conductor pipe sto a lieader'110. The pipe 108 filayl be firfi-t ,vid'ed with a relief valve 112. A'plurality of fluidiconduits oripipes 114, corresponding in number to;the;num-

ber of mill stands to be controlled, 'are conn'ectedutonbe 5 header 110 and each lead to -a 'T joint. 116' which 'adapted'to-dividethe fluid'fiow ateachmill stand assembly, one half of the fluid being'permitted to pass to the upper portion ofthe m-i ll stand and the' remaining .ambunt of flifid'-being permitted to' pass to-the lower portion. TFor 10 "of I simplificatio ="only the lower 1 portion" of the mill stand assembly be discussed to; correspond :to "the foregoing description o'f the apparatus. "Those iparts =61? the hydra'ulic'syst m rying the-u per portion-of the 'iiiill sfand'asseinbly which are-identical to corresponding fiartsseriring the lower portion of the millslta'nd .assernbly havejid'rit'ical fiunierals with the rime designation adad herete: I I

A fluid eoinu'it or pipe 118' is connected to the lower part of the T joint I16 and is adapted 'to entend't'o another T joint"12'0' which is provided to divide the fluid flowing-through the pipe "1 18 into fluid'condui-tsor pipe's' 12-2 and 124. The pipe 122 is connectedtothe flii'id" receiving fitting through a suitable pressure reducing valve -26 and T joint 127 and the pipe 124 is connected to the fluid receiving fitting 102 through a suitablepressure reducing "valve 128 and the T joint 1 29. From each'T joint 1 27 and 129 'a fluid conduit 131 and- 133, passes therefrom through suitable fixed orifices 130 and 132 to constantly bleed aportion of the hydraulic fluid back to"the*hydraulic fluid reservoir 106. Also, avalve'134- may be provided in the'pip'e 118 to completely restrict the flow 'or passage of fluid therethrough. i It may beread'ily ascertained from the above'd'escrip- 'tion that pressure may be selectively applied 'to -ei thcr or both ends or the cleaning roll aide 54 by adjusting the respective pressure reducing valves 126'a'rid 128. This result 'iseif e cted due to the fact that increasing the pressure of thehydratilicfiuid'passing'to a given 'fiuid receiving fitting tends to increase the pressure within the respective cylindrical recess thereby forcing the respective sliding member and its respective end of the cleaning roll axle 54 toward the working roll 12 of the mill.

According to the provisions of the patent statutes, I have explained the principles and mode of operation of my invention, and have illustrated and described what I now consider to represent its best embodiment. ever, I desire to'have it understood that, within the scope of the appended claims, the invention may be 5t) practiced otherwise than as specifically illustrated and,

described.

What is claimed is: 1. In a rolling mill comprising a base frame, a pair of cooperating working rolls journalled in said frame,

and a cleaning device operatively associated witheach of said working rolls, said cleaning device comprisinga cleaning roll, journal means on each end of said cleaning roll, a pair of sliding members one mounting each of said journal means and slidably supported by a pair of 6O guiding members afiixed to said frame, each of said sliding members having a cylindrical recess which receives a piston-like member having a portion which extends out of said cylindrical recess to engage a restraining member pivotally atfixed to said frame, a motor impart mg rotary motion to sald cleaning roll and fluid pressure means including means for equalizing the pressure to each said sliding member for efiecting movement of said sliding member with respect to its associated piston-like;

member whereby the contact pressure between said clean-' ing rolls and said working rolls at either end of said cleaning rolls may be selectively controlled and the pres equalized along the entire lengths of said cleaning rolls.

How-

sure exerted by said cleaning rolls on said working rolls") hydraulic fiuid reservoir connected to the suction of said pumping means, a fluid conduit connecting the delivery -of said pumping means to a header, a plurality of fluid conduits each of which passes from said header through a pressure reducing valve followed by a T joint to each of said cylindrical recesses, each T joint having a fluid conduit passing therefrom through a fixed orifice to said hydraulic fluid reservoir.

3. A rolling mill cleaning device of the type described comprising in combination with a pair of cooperating working rolls journalled in a frame, a roll cleaning device cooperatively associated with each of said working rolls, said cleaning device comprising a cleaning roll, journal means on each end of said cleaning roll, said cleaning roll being movable into and out of peripheral engagement with a working roll, means for supporting said cleaning roll adjacent said working roll secured to said journal means and slidably supported with respect to said frame whereby said journal means and cleaning roll will also be slidably supported with respect to said frame, said slidably supported means including a sliding member provided with a cylindrical recess, a piston-like member inserted in said recess and having a portion which extends out of said recess, a pivotally mounted restraining member engageable with said last mentioned portion projecting from said recess, said restraining member also being pivotally afiixed to said frame, means including a telescopic drive means for rotating said cleaning roll and a fluid pressure means including means for equalizing the pressure to each said sliding member for effecting movement of said sliding member with respect to said pistonlike member whereby the contact pressure between the cleaning roll and the Working roll at either end of said cleaning roll may be selectively controlled and the contact pressure along the entire length of said cleaning roll equalized with respect to said working roll.

4. In a rolling mill comprising a base frame, a pair of cooperating working rolls journalled in said frame and a cleaning device operatively associated with each of said working rolls, said cleaning device comprising a cleaning means, a pair of mounting means one on each end of said cleaning means, a pair of sliding members one mounting each of said mounting means and slidably supported by a pair of guiding members aflixed to said frame, each of said sliding members having a cylindrical recess which receives a piston-like member having a portion which extends out of said cylindrical recess to engage a restraining member pivotally affixed to said frame, and fluid pressure means including means for equalizing the pressure to each said sliding member for effecting movement of said sliding member with respect to its associated piston-like member whereby the contact pressure between said cleaning means and a working roll at either end of said cleaning means may be selectively controlled and the pressure exerted by said cleaning means on said working roll equalized along the entire length of said cleaning means.

References Cited in the file of this patent UNITED STATES PATENTS 598,784 Hughes Feb. 8, 1898 1,401,773 Haldeman Dec. 27, 1921 1,689,656 Williams Oct. 30, 1928 1,761,268 Maclennan June 3, 1930 1,994,691 Da'nl et a1 Mar. 19, 1935 2,049,842 Kling Aug. 4, 1936 2,107,541 Long Feb. 8, 1938 2,267,380 Tyler Dec. 23, 1941 2,332,859 Kreissig et a1 Oct. 26, 1943 2,391,499 Yoder Dec. 25, 1945 2,617,320 Peila Nov. 11, 1952 2,673,521 Huber Mar. 30, 1954 2,680,938 Peterson June 15, 1954 2,690,765 Krummel Oct. 5, 1954 OTHER REFERENCES A Manual of Mechanical Movements, W. M. Clark, pages 53 and 182.