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
  • B65G15/48—Belts or like endless load-carriers metallic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
  • F27B21/06—Endless-strand sintering machines
• • 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 the conveyor belt defined in the preamble of Claim 1.
• the invention also relates to the method defined in the preamble of Claim 7.
• Continuous strand sintering is used for ag- glomerizing pellets after pelletizing concentrate powder, improving the strength and the reactivity of the pellets .
• a strand sintering furnace could be mentioned, which is used in the production of ferro-chromium and divided into several sequential zones, different temperature conditions prevailing in each one of them.
• the strand sintering equipment includes a conveyor belt, which is a perforated steel belt. It is conveyed as an endless loop around two deflector rolls. At the forward end of the furnace, wet fresh pellets are fed onto the steel belt to form a bed with a thickness of a few centimetres.
• the steel belt conveys the bed of pellets through the drying, heating, and sintering zones of the furnace and to a stabilizing or equalizing zone, after which the bed of pellets further travels through sequential cooling zones. After travelling through the cooling zones, the sintered pellets exit the strand sintering equipment at its tail.
• the conveyor belt is formed into an endless loop from a number of rectangular steel plate elements, which are sequentially connected to each other, each comprising two long edges in the lateral direction of the conveyor belt.
• the long edges are parallel with and spaced from each other, the long edge of a similar adjacent second plate element being connected to each long edge.
• the two short edges of the plate element in the longitudinal direction of the conveyor belt are spaced from each other by a distance corresponding to the width of the conveyor belt; in other words, the plate element extends over the width of the conveyor belt.
• Each plate element includes perforation, through which the gas used in sintering can flow through the conveyor belt and onto the bed of pellets on top of the belt.
• the perforations in the plate element are grouped into essentially rectangular, elongated groups of perforations in the direction of the conveyor belt, the groups being parallel with each other and spaced apart by an imperforated gap.
• the conveyor belt according to known technology is disclosed in patent specification FI 111100 B, for example.
• the groups of perforations extend as an essentially continuous, perforated area all the way to each long edge of the plate element.
• the purpose of the invention is to eliminate the disadvantages mentioned above.
• the purpose of the invention is to disclose a conveyor belt structure, which makes it possible to always form the joint lines and the deposition seams of the plate elements in imperforated areas .
• a further purpose of the invention is to disclose a conveyor belt, which is stronger than before, avoiding or at least considerably decreasing the tendency of the perforated areas to plastic deformations, and damages and the need to repair.
• a further purpose of the invention is to disclose an advantageous method of repairing the damaged conveyor belt.
• the conveyor belt according to the invention is characterized in that which is presented in Claim 1.
• the method according to the invention is further characterized in that which is presented in Claim 7.
• the conveyor belt according to the invention is formed into an endless loop from a group of rectangular steel plate elements, which are sequentially connected to each other, each comprising two long edges in the lateral direction of the conveyor belt, the edges being parallel with and spaced from each other, the long edge of a similar adjacent second plate element being connected to each long edge, and two short edges in the longitudinal direction of the conveyor belt, which are spaced from each other by a distance corresponding to the width of the conveyor belt; each plate element including perforations for enabling the flow-through of the gas used in sinter- ing, the perforations in the plate element being grouped into essentially elongated, rectangular groups of perforations in the direction of the conveyor belt, the groups being parallel with each other and spaced from each other by an imperforated gap.
• the perforations in each group of perforations are grouped into a number of subgroups, an imperforated first area being located between each subgroup. Between the subgroups, which are adjacent to each long edge of the plate element, and the long edge, there is an imperforated second area .
• One advantage of the invention is that the imperforated areas improve the stiffness of the perfo- ration so that the formation of permanent deformations, such as creasing, in the conveyor belt is avoided. Due to the imperforated areas, the lateral stiffness, the lateral controllability, and the service life of the conveyor belt are also improved. Fur- thermore, the deposition welding seams and the joint welding seams can always be formed in the imperforated area, facilitating the welding and improving the quality of the welded seams.
• the section that contains the subgroups, to the area of which the damaged areas extend is removed from the conveyor belt so that the opening left by the removed section is limited by the unbroken edge that runs along the imperforated areas.
• a deposition plate with the shape of the opening is formed, including a number of subgroups corresponding to the removed section in essentially the same spots as those in the removed section.
• the edge of the deposition plate is welded to the edge of the opening by means of a con- tinuous welded seam.
• the perforations are evenly distributed in the surface area of the subgroup.
• the perforations are long holes in the lateral direction of the conveyor belt, being arranged in rows in the lateral direction of the conveyor belt.
• the ends of the long holes in the longitudinal direction of the conveyor belt are staggered.
• the ratio of the width of the long hole to its length is about 1:5.
• the width of the imperforated first area is over 5mm, preferably at least 20mm or more.
• the width of the imperforated second area is over 5mm, preferably at least 20mm or more.
• Fig. 1 is a top view of a part of an embodi- ment of the conveyor belt according to the invention
• Fig. 2 shows the detail P of Fig. 1,
• Fig. 3 shows the damaged conveyor belt of Fig. 1
• Fig. 4 illustrates the steps of the method according to the invention.
• Fig. 1 shows part of the conveyor belt 1 of a strand sintering furnace, which is formed into an end- less loop.
• the conveyor belt 1 consists of a number of rectangular steel plate elements 2 that are sequentially connected to each other.
• Each plate element comprises two long edges 3 and 4 in the lateral direction y of the conveyor belt, which are parallel with and spaced from each other.
• the long edge 3, 4 of a similar adjacent second plate element is welded to each long edge 3, 4, end to end.
• the plate element 2 further comprises two short edges 5, 6 in the longitudinal direction X of the conveyor belt, which are parallel with each other and spaced from each other by a distance corresponding to the width L of the conveyor belt.
• Each plate element 2 includes holes 7 for enabling the flow-through of the gas used in sintering, the holes 7 in the plate ele- ment 2 being grouped into essentially rectangular, elongated groups of perforations A in the direction of the conveyor belt, the groups being identical to each other, and there being 9 groups in each plate element in the example of Fig. 1.
• These groups of perforations A are parallel with each other and spaced from each other by an imperforated intermediate area e.
• the holes 7 in each group of perforations A are grouped into a number of rectangular, mutually identical subgroups B, the holes 7 being evenly distributed in the surface area of the subgroups.
• each group of perforations A comprises 4 subgroups B. Between each two adjacent subgroups B, there is a first imperforated area 8. Between the subgroups B ad- jacent to each long edge 3, 4 of the plate element 2 and the long edge, there is an imperforated second area 9.
• the detail P in Fig. 2 shows that the holes 7 are long holes in the lateral direction of the conveyor belt, being arranged in rows R in the lateral direction of the conveyor belt.
• the ends of the long holes 7 in the longitudinal direction of the conveyor belt 1 are staggered.
• the ratio of the width of the long hole 7 to is length is about 1:5.
• the width I 1 of the first imperforated area 8 is wider than 5mm, preferably at least 20mm or more to obtain enough space for the joint welding seam.
• the width I 2 of the second imperforated area 9 is wider than 5mm, preferably at least 20mm or more to obtain enough space for the deposition welding seam.
• Figs . 3 and 4 illustrate a repair method that can be used to repair the conveyor belt of Fig. 1, when a damage D, which is presented in an exemplary way, has developed.
• damage D extends to the area of three subgroups B.
• a section 10 is removed from the conveyor belt 1, containing all three sub- groups B, to the area of which the damage D extends.
• the opening 11 that was left behind by the removed section 10 is limited by the unbroken edge 12 that runs along the imperforated areas 8 e.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Belt Conveyors (AREA)
• Tunnel Furnaces (AREA)
• Powder Metallurgy (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38468739

Family Applications (1)

Country Status (6)

Cited By (4)

Families Citing this family (1)

Citations (3)

Family Cites Families (1)

• 2007
  • 2007-08-15 FI FI20075573A patent/FI122006B/fi active IP Right Grant
• 2008
  • 2008-08-14 WO PCT/FI2008/050461 patent/WO2009022059A1/en active Application Filing
  • 2008-08-14 BR BRPI0815397A patent/BRPI0815397B8/pt active IP Right Grant
  • 2008-08-14 CN CN200880103015A patent/CN101779094A/zh active Pending
  • 2008-08-14 EA EA201000152A patent/EA016332B1/ru not_active IP Right Cessation
  • 2008-08-14 CN CN201410262407.1A patent/CN104048510B/zh active Active
• 2010
  • 2010-02-25 ZA ZA201001366A patent/ZA201001366B/xx unknown

Patent Citations (3)

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