Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F5/00—Dryer section of machines for making continuous webs of paper
  • D21F5/02—Drying on cylinders
  • D21F5/021—Construction of the cylinders
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
  • D21G1/02—Rolls; Their bearings
  • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
  • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid

Definitions

• the present invention relates to a roller for use in calender mills and similar installations. It does substantially consist of a tubular inner jacket and a tubular outer jacket.
• the two jackets are coaxial and define between themselves an annular cross-section space for- a -heat-delivering fluid.
• At each of the two ends of the roller there is a pressure ring which, upon tightening of a number of screws spaced in the circum ⁇ ferential direction of the roller and traversing holes in the rings, is displaced axially inwards whereby the jackets are retained in their positions.
• the object of the invention is to eliminate the above disadvantages by providing a heating roller com- bining the possibility of quick replacement and adjust ⁇ ment of the outer' jacket with eliminated sealing problems- According to the main characteristic of the invention this has been achieved in the way that the pressure rings have flanges extending axially inwards and co-operating wxth the jackets via frusto-conical surfaces so that, upon heat expansion of the jackets, the contact pressure between the jackets and the flanges is increased due to wedge action.
• Figure 1 is a part-sectional, lateral view of a roller according to the first embodiment.
• Figure 2 does, on a larger scale, illustrate the parts of the roller of Figure 1 of direct interest in connection with the present invention.
• Figure 3 corresponds to- Figure 2 but relates to the second embodiment.
• the roller illustrated in Figures 1 and 2 does at each of its ends have a stub shaft 1 comprising a hub portion la carrying a number of radial spokes 2.
• the spokes are tubular and communicate with a central bore lb in shaft 1.
• the heat-delive ⁇ ring fluid for example vapour
• the space 3 of annular cross-section defined between the inner jacket 4 and the outer jacket 5 of the roller is introduced into the space 3 of annular cross-section defined between the inner jacket 4 and the outer jacket 5 of the roller.
• the fluid flows through space 3 and exits in the same way at the opposite end of the roller.
• the fluid passes along a heli ⁇ cal path defined by a helical guide vane 6 surrounding a layer 7 of heat-insulating material on the external surface of the inner jacket 4.
• the edge portion 4a of the inner jacket 4 is be ⁇ velled so that its outer surface forms a frustrated cone
• the edge portion 5a of the outer jacket 5 is bevelled so that its outer surface forms a frust- rated cone.
• These two part-conical surfaces are in con ⁇ tact with matching surfaces of an inner flange 8a and an outer flange 8b, respectively, extending axially in ⁇ wards from a pressure ring 8.
• Ring 8 has a number of axial holes, spaced in the circumferential direction of the ring and traversed by bolts 9 engaging threaded ho ⁇ les in a nut ring 10.
• a packing, or sealing ring, 11 consisting of an elastic material such as rubber.
• the inner jacket 4 does, adjacent to its free end, carry a stop ring 12 the inner radial surface of which contacts a shoulder surface of a flange 10a of nut ring 10.
• ring 10 is in this way blocked against displacement axially outwards meaning that pressure ring 8 will be forced axially in- wards.
• its conical surfaces slide along the conical surfaces of the tapered end portions of jackets 4 and 5.
• sealing ring 11 is compressed and the overall result is that space 3 will be sealed off.
• a heat-delivering fluid such as vapour is passed through space 3
• outer jacket 5 is first heated whereas the temperature rise of the inner jacket 4 is restricted .by the heat-insulating layer 7.
• the outer diameter of pressure ring 8 is slightly less than that of the outer jacket 5. This means that the pressure ring 8 can never get into contact with the other roller in a pair of co-operating rollers in the mill.
• de ⁇ tails having direct or functional counterparts in Figure 2 have been given the same reference numerals as in Figure 2.
• the only difference between the two embodiments is that, in Figure 3, the inner flange 8a of pressure ring 8 does not have a conical but a cylind ⁇ rical outer surface, and portion 4a of inner jacket 4 naturally exhibiting a matching configuration.
• the two embodiments illustrated and above de ⁇ scribed are intended only to illustrate the principle of the solution of the sealing problem in heating rol ⁇ lers covered by the present invention. Accordingly, the inventive concept resides in the realization that the pressure rings and the end portions of one or both of the jackets can be shaped in such a way that, thanks to wedge action, thermal expansion results in an increase of the contact pressure at the sealing surfaces whereby the leakage risk is eliminated. It follows therefrom, that it also is within the scope of the invention to use such a layout of the roller that the contact between the pressure ring and the jackets is not direct but occurs via some intermediate members.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Paper (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Treatment Of Fiber Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20343499

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Family Cites Families (4)

• 1981
  • 1981-04-01 SE SE8102105A patent/SE428302B/sv not_active IP Right Cessation
• 1982
  • 1982-03-26 ZA ZA00812071A patent/ZA822071B/xx unknown
  • 1982-03-31 WO PCT/SE1982/000101 patent/WO1982003414A1/en not_active Ceased
  • 1982-03-31 AR AR288974A patent/AR226261A1/es active
  • 1982-03-31 AU AU82792/82A patent/AU8279282A/en not_active Abandoned
  • 1982-03-31 EP EP82901046A patent/EP0086784A1/de not_active Withdrawn
  • 1982-04-01 IT IT8267431A patent/IT8267431A0/it unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events