Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
  • B65G39/02—Adaptations of individual rollers and supports therefor
• • 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
  • F16C13/02—Bearings

Definitions

• the invention relates to a roller mounted on bearings.
• rollers intended to support a load such as a metal strip J in particular in a heat treatment oven in which this strip must be annealed at a relatively high temperature.
• Such rollers consist of a cylinder of refractory material. At each end of this cylinder is attached a nozzle mounted to rotate on a bearing.
• US-A-4 399598 describes a ceramic roller for transporting glass sheets for heat treatment.
• the cylinder is mounted rotating on bearings by means of end pieces mounted with clearance at each end of the cylinder.
• One or more radially compressible split metal rings are arranged in the space between the outside diameter of the cylinder and the diameter
• a roller of this type overcomes the aforementioned drawbacks and ensures the coaxiality of the cylinder and the nozzle under load. In fact, this coaxiality is not affected when a load, even a high one, is applied to the roller.
• a device of this type also has a certain number of drawbacks.
• the contact between the nozzle and the cylinder takes place on a frustoconical area, namely the range of the roller on the nozzle.
• the contact is made only in an elongated zone distributed on either side of a generator. contact. This contact area moves with the rotation of the roller.
• the contact between the end piece and the jacket takes place gradually over the entire periphery of the circumference.
• the metal shaft deforms under load. Consequently, the contact zone already reduced to an elongated zone situated along the generator due to the machining tolerances, becomes a point support zone.
• the contact pressure between the nozzle and the roller then increases considerably until it exceeds the admissible limit value for ceramic. This therefore leads to crumbling and / or cracking of the ceramic.
• the present invention relates to a roller, intended in a nonlimiting manner for applications in the field of the glass industry or of the steel industry, which overcomes these drawbacks. It allows to maintain a sufficient contact surface between the nozzle and the jacket (or a full roller) despite the bending - inevitable - of the shaft under load. By sufficient contact surface is meant that this surface will be large enough that the contact pressure between the materials never exceeds one admissible limit value. In this way, the material constituting the jacket, for example a ceramic material, is prevented from cracking, so that the service life of the installation is greatly increased.
• said roller comprises a jacket of refractory material, having two ends and a defined range at each of these ends; two end pieces mounted rotating on at least one shaft, placed in the axis of the liner at each end and receiving the bearing surface of the liner, these end pieces being made of a material having a higher coefficient of expansion than that of the refractory material of the shirt, a substantially spherical joint of each of the ends of the shirt, the centers of these joints being distinct from each other.
• the surface of the contact zone between the jacket and the shaft is not reduced when the latter bends under load. Similarly, no additional bending force is printed on the roller.
• the jacket is hollow and the roller comprises a shaft passing through said jacket.
• one of the end pieces is mounted fixed and the other end piece is mounted sliding axially, an elastic means, such as a spring, pressing this end piece against the bearing surface.
• the spherical or ball joint can be made between the liner and a nozzle.
• the ball joint can be produced between a shaft passing through the jacket and a nozzle. It can be obtained by an intermediate piece mounted on a span, for example a shell, of the shirt. This piece preferably has a small width and thickness relative to its diameter.
• Figure 1 is a schematic representation partially in section of a roller according to a known prior art
• Figure 2 illustrates the contact area between the jacket and the tip in the case of a roller of the type shown in Figure 1
• Figure 3 is a partial sectional view showing a roller according to the invention
• Figures 4, 5, 6 are detailed views of particular embodiments of the present invention
• Figure 7 is a schematic perspective view which illustrates the contact area of the jacket on the nozzle
• - Figure 8 illustrates a variant in which the spherical joint is placed between the nozzle and the shaft
• FIG. 9 illustrates a variant in which the shirt is full.
• the reference 1 designates a tree. It passes through a jacket 2 made of a refractory material, for example a ceramic.
• a tip, for example metallic, 3 is mounted at one end of the jacket 2.
• a second tip, designated by the reference 4 is mounted at the other end of the jacket 2.
• the tip 3 is fixedly mounted on the shaft.
• the end piece 4 is slidably mounted on this shaft 1 and a helical spring 5 allows it to be pressed against the liner 2 (in the figure the liner and the two end pieces have been shown spaced apart for better readability of the drawing).
• the jacket 2 has a frustoconical surface 6 while the end pieces 3 and 4 comprise a frustoconical zone 7 whose angle of conicity is equal to that of zone 6.
• the angle of conicity is preferably relatively large in order to avoid the phenomena of jamming of the male cone (the jacket) in the female cone (end pieces 3 and 4).
• This angle depends on the coefficients of friction of the materials present. For example, for a steel / vitreous silica pair, it could be around 70 degrees of angle.
• This roller has the drawbacks which have been mentioned previously, namely the fact that the contact zone between each of the end pieces 3 and 4 and the jacket 2 is reduced to an almost punctual zone when the shaft 1 flexes under load.
• Figure 2 the bearing area of the shirt (or a full roll) on a nozzle in the case of an assembly of the prior art.
• this area 17, of small width is distributed on either side of a generatrix of the frustoconical part 6 of the jacket 2. This is due to the fact that the diameter of the frustoconical part of the jacket 2 is necessarily slightly smaller than the inside diameter of the end piece 3, 4 (not shown in fig 2) and also to the fact that the end piece, because it is solid, does not deform very much. It will be understood that a slight misalignment of the nozzle relative to the roller greatly reduces the contact area 17 because the latter is then reduced to a point area.
• FIG. 3 a roller according to the invention which overcomes the disadvantages of the roller described with reference to Figure 1.
• the tips 3 and 4 have been modified so as to present, instead of the frustoconical surfaces 7, spherical bearing surfaces 8.
• an intermediate piece 9 disposed between the jacket 2 and each of the end pieces 3 and 4.
• Each of the pieces 9 has the shape of a ring. Its face facing the end pieces 3 and 4 has a spherical bearing surface with the same radius of sphericity as the surfaces 8 of the end pieces 3 and 4.
• the faces of the rings 9 directed towards the jacket 2 have a frustoconical bearing surface of the same conicity as the surfaces 6 of the sleeve 2.
• the centers of the spherical joints are spaced so as to define a precise position of the axis of the roller.
• FIGS. 4 to 6 show alternative embodiments.
• FIGS. 4 to 6 show alternative embodiments.
• FIG. 4 there is no intermediate piece between the tip and the jacket.
• a spherical surface 11 is formed directly on the jacket 2.
• the intermediate part 12 has frustoconical and spherical faces inverted with respect to the part 9. Its frustoconical face is directed towards the end pieces 3 and 4 while the spherical face is directed to folder 2.
• the intermediate piece 9, 12 has a width and a thickness that are small relative to its diameter. This allows the orientation of the contact area to be changed. In fact, because the intermediate piece has a small width, it can easily deform elastically so as to adapt to the shape of the jacket.
• the bearing zone (or contact zone) has been represented in FIG. 7. 19 of the liner 2 (or of a full roller) on a nozzle in the case of a roller according to the invention, in particular in the case of the use of an intermediate piece such as 9, 12.
• the zone 19 is distributed over an arc of a cross section of the frustoconical part 6 of the jacket 2 by a plane perpendicular to the longitudinal axis of the roller. This arc is defined by an angle at the center a.
• the value of the angle depends on the flexibility of the intermediate piece 9, 12. Since the width and the thickness of such a part are relatively small, it deforms under load and follows the shape of the shirt on a central arc. It will be understood that in the event of a variation in the alignment between the end piece and the jacket, the surface of the contact area 19 is little reduced. Since the contact area does not decrease, when the shaft 1 flexes under load, as is the case in the prior art, it is no longer necessary to oversize the thickness of the jacket. This results in a decrease in the self-weight of the latter.
• FIG. 8 shows an alternative embodiment in which the ball joint is produced not between the jacket and the end piece, but between the end piece and the shaft 1.
• a ring 20 is mounted on the 'shaft 1. It has a spherical surface 22.
• the center of the sphere is located on the longitudinal axis 24 of the shaft 1. In this way the end piece 4 can pivot around the center 0, achieving a ball joint.
• the intermediate part 9, 12 is made of a material having a good coefficient of metal / metal friction, for example copper.
• FIG. 6 represents an alternative embodiment in which the ball joint is obtained by a spherical surface 15 formed on the jacket, bearing on a frustoconical surface 16 of the end piece.
• Fig 9 an alternative embodiment in which the jacket 2 is full and not hollow. Consequently, there is no through shaft such as the shaft 1 shown in Figs 1 to 8. Instead, each end piece 3, 4 is mounted cantilevered on a shaft la, lb .
• the end piece 3 is fixedly mounted on the shaft 1a.
• the end piece 4 is slidably mounted on the shaft 1b. It is pushed against the jacket 2 by a spring 5.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rollers For Roller Conveyors For Transfer (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Pivots And Pivotal Connections (AREA)
• Rolling Contact Bearings (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9444764

Family Applications (1)

Country Status (12)

Families Citing this family (17)

Citations (5)

Family Cites Families (8)

• 1993
  • 1993-03-05 FR FR9302671A patent/FR2702202B1/fr not_active Expired - Fee Related
• 1994
  • 1994-03-01 ES ES94103021T patent/ES2104209T3/es not_active Expired - Lifetime
  • 1994-03-01 DE DE69403118T patent/DE69403118T2/de not_active Expired - Lifetime
  • 1994-03-01 EP EP94103021A patent/EP0613840B1/en not_active Expired - Lifetime
  • 1994-03-04 JP JP06005494A patent/JP3491057B2/ja not_active Expired - Fee Related
  • 1994-03-04 RU RU94046123A patent/RU2143392C1/ru not_active IP Right Cessation
  • 1994-03-04 KR KR1019940703885A patent/KR100308410B1/ko not_active Expired - Fee Related
  • 1994-03-04 WO PCT/FR1994/000214 patent/WO1994020394A1/fr active Application Filing
  • 1994-03-04 BR BR9404289A patent/BR9404289A/pt not_active IP Right Cessation
  • 1994-03-04 CN CN94190105A patent/CN1065204C/zh not_active Expired - Lifetime
  • 1994-03-17 TW TW083102323A patent/TW267212B/zh active
• 1995
  • 1995-05-26 US US08/453,559 patent/US5484371A/en not_active Expired - Lifetime

Patent Citations (5)

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