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
  • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
  • B65G15/30—Belts or like endless load-carriers
  • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
  • B65G15/40—Belts or like endless load-carriers made of rubber or plastics troughed or tubular; formed with joints facilitating troughing
• • 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
  • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
  • B65G15/30—Belts or like endless load-carriers
  • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
  • B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
  • B65G15/36—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric the layers incorporating ropes, chains, or rolled steel sections
• • 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
  • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
  • B65G2201/04—Bulk

Definitions

• the invention relates to flexible conveyor belts comprising an internal carcass or reinforcement ensuring longitudinal and transverse resistance to mechanical forces, this carcass being covered with layers of coating of rubber or similar elastomer.
• These conveyor belts are normally manufactured in a flat form which allows them. roll in cylindrical rollers for storage and transport to the place of use but when they are used to transport loose materials they are generally supported and guided by rollers giving them a trough shape with a flat bottom, which increases transport capacity by reducing the risk of overflowing materials.
• the invention relates particularly to conveyor belts manufactured in a flat form and intended for use on installations comprising guide rollers giving said bands a trough shape in cross section.
• the stability of the band on its trajectory constitutes an important condition of a good functioning because otherwise the band risks to move laterally until striking the infrastructure of the carrier and thereby wear out or be damaged prematurely.
• Proper guidance of the strip therefore requires a sufficient number of support rollers which are fairly close to one another.
• these rollers are generally given an oblique pinch with respect to the longitudinal direction to exert forces on the strip tending to center the strip on its train of support rollers.
• the subject of the invention is a conveyor belt with an improved centering characteristic, easier to stabilize on its trajectory and consequently making it possible to lighten both the guide systems of the conveyors and the construction of the belt itself.
• This band according to the invention is characterized in that its carcass of longitudinal and transverse mechanical strength is associated with at least one narrow stiffening layer with high resistance in transverse compression of width between 1/4 and 2/3 of the width of the strip, located axially in the central part of the strip and placed on one of the sides of the carcass.
• this stiffening layer is chosen to correspond to the flat bottom of the trough formed by the central and lateral guide rollers of the conveyor which tends to favor the self-centering of the strip between the inclined lateral rollers falling the edges of the strip to give it this trough shape.
• the band can then be used in both directions of travel.
• the return strand of the strip can be supported essentially by trains of flat rollers, possibly associated with only a few spaced stabilizing rollers in bucket.
• the possibility of increasing the load capacities either by increasing the angle formed by the edges of the trough band, or by widening the bottom of the trough thanks to the greater transverse flexibility of the sides Of the band.
• the better stability of the strip on its guide rollers allows greater practical loading capacity, closer to the theoretical capacity permitted by this trough shape, without risk of lateral overflow of the transported product.
• Fig.l is a cross-sectional view of the flat strip.
• Fig.2 is a perspective view with cutaway floors.
• Fig.3 is a cross-sectional view of the strip in the trough.
• the conveyor belt is made flat and therefore has a flat shape at rest with a constant thickness from one edge to the other.
• This strip comprises an internal carcass of mechanical resistance consisting essentially of two superposed plies 1, 2 embedded between two layers of coating 3, 4 of vulcanized rubber or similar flexible material.
• the entire carcass extends transversely along the width of the strip, neglecting the thickness of the heels provided on each side to protect the edges of the strip from wear.
• the lower ply 1 is made up of parallel longitudinal cords having the necessary resistance, such as steel cords or high-resistance textile cords, to withstand the operating tension and the longitudinal tensile forces.
• the sheet 2 is made up of parallel transverse cables. made of metal or textile ⁇ and its role is essentially to withstand the shocks of the load to prevent the longitudinal tearing of the strip, to allow the ends to join by stapling for endless setting and to give "body "to the whole band.
• the narrow transverse stiffening layer 5 is placed above the transverse ply 2 of the carcass, in the central zone of the strip so as to reserve two relatively more flexible lateral zones.
• the central zone reinforced by the narrow layer 5 corresponds practically to the flat bottom of the trough supported by the central roller 6 lateral to the buckets and the zones / correspond to the inclined parts supported by the inclined rollers 7 of the buckets (fig.3).
• the narrow stiffening layer 5 is arranged so as to have a high resistance to compression in the transverse direction. It advantageously consists of relatively stiff transverse elements such as metallic cables of the bars or transverse blades arranged parallel to one another in the same plane. As a variant, layer 5 could be constituted with other elements such as textile cords or glass cords, fabrics arranged in one or more thicknesses or with a layer of rubber mixture stiffer than that used for the rest of the strip. , e.g. rubber mix containing fibers short dispersed in rubber. However, it is preferable that the narrow layer 5 is made up of metallic transverse elements, such as cables, bars or blades which are both more rigid in bending and heavier than the volume of rubber which they replace.
• the rubber coating layers 3 and 4 are such that the finished strip has a uniform and regular thickness from edge to edge.
• the thickness of these layers 3, 4 is such that, preferably, the transverse resistance ply 2 of the carcass is situated approximately at the mid-thickness of the strip, in the plane of the neutral axis of transverse bending of the band.
• the lateral zones of the strip not affected by layer 5 have a relatively great flexibility.
• the central zone reinforced by the two successive thicknesses of the plies of transverse cables 2 and 5 is stiffer in compression and in transverse bending. This difference in flexibility between the central zone and the lateral zones tends to favor the self-centering of the strip when it moves longitudinally on the rollers 6-7 of the successive troughs of the conveyor.
• This self-centering effect is all the more accentuated when the transverse elements of the narrow layer 5 are elements with a high specific weight, probably because the increased gravity of the central part of the band accentuates the centering forces contributing to the stability of the strip on its trajectory.
• the great relative flexibility of the lateral zones allows a more accentuated lifting of the edges, that is to say an increase in the transport capacity of the strip thus placed in the trough.
• Figure 3 also shows the guide of the return strand of the conveyor belt on rollers 8 arranged in a flat undercarriage.
• rollers 8 can be cylindrical from one edge to the other or preferably, they can be hollowed out in their central part along a width corresponding to that of the bottom of the buckets, which offers the double advantage of reducing the fouling of the rollers. return by the load-bearing side of the strip and create, in association with the narrow stiffening layer, a tendency for the strip to self-center on the return undercarriage.
• the invention is susceptible of other variants, in particular for questions of adaptation to the infrastructures of existing carriers having to use such bands.
• the narrow stiffening layer 5 could possibly be divided axially into two parts juxtaposed along the longitudinal axis of the strip to form a longitudinal hinge at the center allowing the strip to be used on existing conveyors having return rollers arranged in V.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Belt Conveyors (AREA)
• Structure Of Belt Conveyors (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9232905

Family Applications (1)

Country Status (15)

Cited By (10)

Families Citing this family (1)

Citations (5)

• 1979
  • 1979-12-17 FR FR7931030A patent/FR2471337A1/fr active Granted
• 1980
  • 1980-12-01 BR BR8008923A patent/BR8008923A/pt unknown
  • 1980-12-01 EP EP80902291A patent/EP0047739B2/fr not_active Expired - Lifetime
  • 1980-12-01 WO PCT/FR1980/000173 patent/WO1981001697A1/fr not_active Ceased
  • 1980-12-01 JP JP56500108A patent/JPS57500143A/ja active Pending
  • 1980-12-01 DE DE8080902291T patent/DE3071254D1/de not_active Expired
  • 1980-12-09 PT PT72179A patent/PT72179B/pt unknown
  • 1980-12-11 MX MX185166A patent/MX151667A/es unknown
  • 1980-12-11 ZA ZA00807771A patent/ZA807771B/xx unknown
  • 1980-12-12 BE BE0/203151A patent/BE886634A/fr not_active IP Right Cessation
  • 1980-12-16 IT IT68918/80A patent/IT1129444B/it active
  • 1980-12-16 MA MA19221A patent/MA19018A1/fr unknown
  • 1980-12-16 PL PL22850880A patent/PL228508A1/xx unknown
  • 1980-12-16 ES ES497814A patent/ES497814A0/es active Granted
  • 1980-12-17 OA OA57280A patent/OA06671A/xx unknown
• 1981
  • 1981-08-18 OA OA57475A patent/OA06882A/xx unknown

Patent Citations (5)

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