WO2025015372A1 - Racleur de bande transporteuse - Google Patents

Racleur de bande transporteuse Download PDF

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Publication number
WO2025015372A1
WO2025015372A1 PCT/AU2024/050755 AU2024050755W WO2025015372A1 WO 2025015372 A1 WO2025015372 A1 WO 2025015372A1 AU 2024050755 W AU2024050755 W AU 2024050755W WO 2025015372 A1 WO2025015372 A1 WO 2025015372A1
Authority
WO
WIPO (PCT)
Prior art keywords
scraper
holding body
backing strip
tungsten carbide
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU2024/050755
Other languages
English (en)
Inventor
Francelino CLIMACO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Da Gama Industries Pty Ltd
Original Assignee
Da Gama Industries Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2023902268A external-priority patent/AU2023902268A0/en
Application filed by Da Gama Industries Pty Ltd filed Critical Da Gama Industries Pty Ltd
Priority to EP24841822.0A priority Critical patent/EP4743378A1/fr
Priority to CN202480046600.3A priority patent/CN121532344A/zh
Priority to AU2024294281A priority patent/AU2024294281A1/en
Priority to PE2026000046A priority patent/PE20260925A1/es
Priority to JP2026525294A priority patent/JP2026525702A/ja
Publication of WO2025015372A1 publication Critical patent/WO2025015372A1/fr
Priority to CL2026000014A priority patent/CL2026000014A1/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B65G45/00—Lubricating, cleaning, or clearing devices
    • B65G45/10—Cleaning devices
    • B65G45/12—Cleaning devices comprising scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 relating to soldering or welding
    • B23K31/025—Connecting cutting edges or the like to tools; Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • 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
    • B65G45/00—Lubricating, cleaning, or clearing devices
    • B65G45/10—Cleaning devices
    • B65G45/12—Cleaning devices comprising scrapers
    • B65G45/16—Cleaning devices comprising scrapers with scraper biasing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting

Definitions

  • the present disclosure relates to conveyor belt scrapers, also known as conveyor belt cleaner tip, used to remove residual material which clings or adheres to the surface of a belt of a conveyor belt machine.
  • conveyor belts conveying coal and coke have utilised belt scrapers made of a stainless steel or mild steel main body, also known as a holding body, which holds a scraper element having of a plurality (usually three or four) of tungsten carbide blades (also known as inserts) arranged as end-to-end, closely separated, segments brazed to, but projecting from, a common edge of the main body at a desired common angle.
  • a stainless steel or mild steel main body also known as a holding body, which holds a scraper element having of a plurality (usually three or four) of tungsten carbide blades (also known as inserts) arranged as end-to-end, closely separated, segments brazed to, but projecting from, a common edge of the main body at a desired common angle.
  • a plurality of such belt scrapers, arranged end-to-end, is required to extend across (and provide enough scraper elements to scrape against) the full (or effective) width of the conveyor belt.
  • the angle at which the scraper element projects from the steel main body varies for different types of belt scrapers, and this is particularly the case for scrapers known as H-type, P-type and R- type scrapers, with each type being uniquely suited to cleaning the belt at different locations therealong.
  • brazing is used to melt a silver-based filler material so that it flows to form a joint between the plurality of the tungsten carbide blades and the steel main body, but under the high temperature reached by brazing, the steel expands (and then contracts during cooling) significantly more than does the tungsten carbide, due to their very different thermal properties, and especially their very different thermal expansion rates.
  • the contraction of the steel main body far exceeds that of the tungsten carbide blades, such that the steel main body continues to contract after the tungsten carbide blades have stopped contracting, causing the facing end surfaces of any two adjacent tungsten carbide blades to be moved closer together, and thus reducing the gap between them, due to the still contracting steel main body to which the two adjacent blades are joined.
  • This problem is particularly acute when attempting to braze a single tungsten carbide blade substantially along the length of the steel main body of the belt scraper, and so has prevented the adoption and widespread use of any such single blade belt scrapers, but is less acute, although still of concern, when brazing a plurality of tungsten carbide blades along the length of the steel main body of the belt scraper.
  • a scraper for a belt of a conveyor belt machine comprising:
  • a holding body made of a first metal or alloy material and having a length, the holding body being adapted for connecting to a mounting assembly of the conveyor belt machine
  • scraper element joined to the holding body and adapted for scraping from the belt any conveyed material which has adhered to the belt, the scraper element comprising a single tungsten carbide blade having a length which extends substantially the length of the holding body, the single tungsten carbide blade being joined by brazing to a backing strip made of a second metal or alloy material which is the same or similar in its thermal properties to the first metal or alloy material of the holding body, whereupon the backing strip of the so assembled scraper element is then joined to the holding body, such that the single tungsten carbide blade extends substantially the length of the holding body.
  • the holding body comprises a variably projecting wall portion to which the backing strip of the scraper element is joined, wherein the variably projecting wall portion extends to varying extents of height along its length from a mounting wall portion, and a welded joint is formed along a variable path which follows an outer line of the variably projecting wall portion.
  • the backing strip is preferably an L-section backing strip.
  • the backing strip may be a flat-section backing strip.
  • the variably projecting wall portion is preferably a saw tooth arrangement.
  • the welded joint is a zig zag shaped welded joint.
  • the variably projecting wall portion may be a wave surface arrangement.
  • the welded joint is a wave surface shaped welded joint.
  • the first metal or alloy material is selected from stainless steel or mild steel.
  • the second metal or alloy material is selected from stainless steel or mild steel.
  • the backing strip of the scraper element may be joined to the holding body by welding.
  • the single tungsten carbide blade may be joined to the backing strip by induction brazing.
  • the metal filler material is preferably a silver-based filler material.
  • the silver-based filler material is in the form of a trilay structure.
  • a method of assembling a scraper for a belt of a conveyor belt machine comprising the steps of: (a) providing a holding body made of a first metal or alloy material and having a length,
  • the step of brazing of the single tungsten carbide blade to the backing strip is by induction brazing.
  • the step of joining of the assembled scraper element to the holding body is by welding.
  • Fig. 1 is an isometric view of one end of a conventional conveyor belt machine to which conveyor belt scrapers or belt cleaner tips of the prior art are engaged for cleaning the surface on the return side of the belt from adhered particulate material.
  • Fig. 2 is a side view of the conveyor belt machine shown in Fig. 1.
  • Fig. 3 is an isometric view of a H-type belt scraper of the prior art.
  • Fig. 4 is an isometric view of a R-type belt scraper of the prior art.
  • Fig. 5 is an isometric view of a P-type belt scraper of the prior art.
  • Fig. 6 is an isometric exploded view of the prior art H-type belt scraper of Fig. 3.
  • Fig. 7 is a side sectional view of the prior art H-type belt scraper of Fig. 3.
  • Fig. 8 is a side sectional view of the prior art P-type belt scraper of Fig. 5.
  • Fig. 9 is a side sectional view of the prior art R-type belt scraper of Fig. 4.
  • Fig. 10 is an isometric view, from above, of a conveyor belt scraper or belt cleaner tip (of the H-type) according to a first embodiment of the present invention.
  • Fig. 11 is an isometric view, from below, of the conveyor belt scraper of Fig. 10.
  • Fig. 12 is an isometric exploded view of a scraper element of the conveyor belt scraper of Figs. 10 and 11, the scraper element being securable to a holding body for connecting to a mounting assembly of a conveyor belt machine.
  • Fig. 13 is a side sectional view of the scraper element of Fig. 12 when assembled.
  • Fig. 14 is an isometric view of the assembled scraper element of Fig. 13 adjacent to a holding body to which it is about to be secured.
  • Fig. 15 is a side sectional view of the conveyor belt scraper of Figs. 10 and 11 in which the scraper element and the holding body of Fig. 14 are secured together.
  • Fig. 16 is an isometric view of the conveyor belt scraper of Fig. 15, and which is identical to that of Fig. 10.
  • Fig. 17 is an isometric view of a conveyor belt scraper or belt cleaner tip (of the P-type) according to a second embodiment of the present invention.
  • Fig. 18 is an isometric view of a conveyor belt scraper or belt cleaner tip (of the R-type) according to a third embodiment of the present invention.
  • Fig. 19 is a side sectional view of the R-type belt scraper of Fig. 18.
  • Fig. 20 is a side sectional view of the P-type belt scraper of Fig. 17.
  • Fig. 21 is a side view of an end portion of a conventional conveyor belt machine to which a HT-type belt scraper or belt cleaner tip of the prior art is engaged for initially cleaning the surface on the return side of the belt from adhered particulate material.
  • Fig. 22 is an isometric view, from above, of the HT-type belt scraper of the prior art shown in Fig. 21.
  • Fig. 23 is an isometric view, from below, of the HT-type belt scraper of Fig. 22.
  • Fig. 24 is a side view of the HT-type belt scraper of Figs. 22 and 23.
  • Fig. 25 is an isometric view, from above, of a conveyor belt scraper or belt cleaner tip (of the HT-type) according to a fourth embodiment of the present invention.
  • Fig. 26 is an isometric view, from below, of the HT-type belt scraper of Fig. 25.
  • Fig. 27 is a side view of the HT-type belt scraper of Figs. 25 and 26.
  • the conventional conveyor belt machine 10 shown in Figs. 1 and 2 conveys particulate or bulk materials 12, such as coal, coke and iron ore, on its belt 11 in the direction shown by the arrows A, and any residual “carryback” matter of those materials 12 which does not fall off the end of the belt 11, but clings or adheres to the surface on the return side 13 of the belt 11, is substantially removed by the sequential actions of the H-type scraper 14, the P-type scraper 16, and the R-type scraper 18 of the prior art, each of which is connected to a dedicated suspension arm and mounting assembly 20, 22, 24, respectively, of the conveyor belt machine 10.
  • particulate or bulk materials 12 such as coal, coke and iron ore
  • the prior art H-type scraper 14 shown in Figs. 3 and 7 has a H-type holding body 26 to which is secured a scraper element 28.
  • the scraper element 28 includes a conventional trilay structure 30 used in brazing processes, and made of conventional metal filler material, such as filler material known as “trimetal brazing alloys” in the form of laminated foils or a threelayered structure, which is sandwiched between a stepped portion 32 of the holding body 26 and four pieces or blades 34 of tungsten carbide.
  • the trilay structure 30 is a three-layered structure having two outer strips of silver-based brazing filler material clad onto a copper middle layer (or carrier filler material) in a suitable size ratio of, say, 1 to 2 to 1 (1 :2: 1).
  • an induction brazing process is used to melt the metal filler material of the trilay structure 30 so that it flows and effectively joins the four blades 34 of tungsten carbide to the holding body 26.
  • induction brazing has been used in this example of the prior art, other suitable techniques of brazing may alternatively be used, such as silver brazing, which is sometimes known as hard soldering.
  • tungsten carbide cools down from high temperatures at a very different rate to steel, as these two materials have very different thermal properties.
  • the prior art P-type scraper 16 shown in Figs. 5 and 8 has a P-type holding body 38 to which is secured a scraper element 40.
  • the scraper element 40 includes a conventional trilay structure 30 sandwiched between a stepped portion 42 of the holding body 38 and three pieces or blades 44 of tungsten carbide separated end-to-end by expansion joints 46 for reasons stated above, and the three blades 44 of tungsten carbide are joined to the holding body 38 by a process of brazing as described above.
  • the prior art R-type scraper 18 shown in Figs. 4 and 9 has an R-type holding body 48 to which is secured a scraper element 50.
  • the scraper element 50 includes a conventional trilay structure 30 sandwiched between a stepped portion 52 of the holding body 48 and three pieces or blades 54 of tungsten carbide separated end-to-end by expansion joints 56 for reasons stated above, and the three blades 54 of tungsten carbide are joined to the holding body 48 by a process of brazing as described above.
  • a scraper 60, 90, 110, 160 or cleaner tip for a belt 11 of a conveyor belt machine 10.
  • the scraper has a holding body 62, 92, 112, 162 made of a first metal or alloy material and having a length.
  • the holding body is configured or adapted for connecting to a mounting assembly 20, 132 of the conveyor belt machine.
  • the scraper also has a scraper element 64, 164 joined to the holding body.
  • the scraper element is configured or adapted for scraping from the belt any conveyed material 12 which has adhered to the belt.
  • the scraper element has a single tungsten carbide blade 70, 170 having a length which extends substantially the length of the holding body, the single tungsten carbide blade being joined by brazing to a backing strip 66, 168.
  • the backing strip is made of a second metal or alloy material which is the same or similar in its thermal properties to the first metal or alloy material of the holding body. The backing strip of the so assembled scraper element is then joined to the holding body.
  • the scraper provided hereby is such that the single tungsten carbide blade extends substantially the length of the holding body.
  • a conveyor belt scraper or belt cleaner tip 60 according to a more specific first embodiment of the present invention is shown in Figs. 10 to 16.
  • the scraper 60 is of the H-type, but has a modified H-type holding body 62, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, to which is secured a modified scraper element 64.
  • the scraper element 64 includes a central L-section trilay structure 68 used in brazing processes, and preferably made of conventional filler material, a thin L-section backing strip 66 or plate, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, on one side of the trilay structure 68, and a single piece or blade 70 of tungsten carbide which provides a scraping edge 71 on the other side of the trilay structure 68.
  • the L-section backing strip 66 is joined along at least one first surface thereof to the holding body 62.
  • the L-section backing strip 66 is also joined along at least one opposite second surface thereof to the single blade 70 of tungsten carbide via the trilay structure 68.
  • a suitable brazing process is used to braze the L-section trilay structure 68 securely between the L-section backing strip 66 and the single blade 70 of tungsten carbide to form or assemble the scraper element 64 in a first step of assembling the belt scraper 60.
  • an induction brazing process is used to melt the filler material of the trilay structure 68 so that it flows and effectively joins the single blade 70 of tungsten carbide to the holding body 62.
  • induction brazing has been used in this embodiment of the invention, other suitable techniques of brazing may alternatively be used, such as silver brazing, which is sometimes known as hard soldering.
  • the trilay structure 68 must comprise a filler material having a lower melting point than the two surfaces being joined.
  • a metal filler material having two outer strips (or layers) comprising predominantly of silver with lower concentrations of other common filler metals, such as zinc, nickel, manganese and optionally cadmium, clad onto a core strip of copper can be used.
  • the filler material will become molten when sufficiently heated by electromagnetic induction and then flow by capillary action to bond together the two surfaces to form the joint when cooled.
  • the L-section backing strip 66 of the assembled scraper element 64 is then secured to an L- shaped stepped portion 72 of the holding body 62, in a second step of assembling the belt scraper 60, by a suitable welding process, such as laser welding, or possibly by plasma welding, or by traditional TIG welding or MIG welding, or by a suitable fastening process which utilizes mechanical fasteners or other connecting devices.
  • a suitable welding process such as laser welding, or possibly by plasma welding, or by traditional TIG welding or MIG welding, or by a suitable fastening process which utilizes mechanical fasteners or other connecting devices.
  • this may be primarily attributable to the use of the backing strip 66 to which the single blade 70 of tungsten carbide is brazed, and which is made of the same, or similar, material (especially in its thermal properties) as that of the holding body 62.
  • Those features enable the facing surfaces of the backing strip 66 and the holding body 62 to be joined in the second step by heating, such as by welding, at a lower temperature than that which is used in the prior art, where there is no use of a backing strip, and where the higher temperature process of brazing is used to join the plurality of tungsten carbide blades to the holding body via the trilay structure to form or assemble the prior art belt scraper in a single step.
  • the H-type holding body 62 has a saw tooth arrangement 73 which forms a variably projecting wall portion 74 that extends perpendicularly to varying extents of height along its length from a larger mounting wall portion 76 (as specifically shown in Figs. 10, 14 and 16).
  • Bolts or studs are adapted to pass through holes 78 in the mounting wall portion 76 to connect the scraper 60 to the suspension arm and mounting assembly 20 (see Figs. 1 and 2) of the conveyor belt machine 10.
  • a surface 80 of the projecting wall portion 74 facing away from the bolt holes 78 and an adjoining surface 82 of the mounting wall portion 76 (located at the side of the projecting wall portion 74 opposite to the side which faces the bolt holes 78) form the L- shaped stepped portion 72 of the holding body 62 to which the L-section backing strip 66 of the assembled scraper element 64 is welded.
  • a zig zag shaped welded joint 84 is formed along a variable path which follows an outer line (or the outline) of the saw tooth arrangement 73 of the variably projecting wall portion 74.
  • the non-linear or variable path of the zig zag shaped welded joint 84 significantly prolongs the useful life of the scraper 60 compared to the much shorter useful life of the prior art scrapers.
  • the scraper 60 can remain operational for as long as there is sufficiently strong bonding by at least some parts of the zig zag shaped welded joint 84 between the scraper element 64 and the variably projecting wall portion 74, even though prolonged use may cause progressive and gradual wearing away of parts of both the scraper element 64 and the variably projecting wall portion 74, and of parts of the zig zag shaped welded joint 84 which are closer to the scraping edge 71 of the scraper element 64 than to the mounting wall portion 76.
  • the scraper 90 is of the P- type, but has a modified P-type holding body 92, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, to which is secured the same modified scraper element 64 as used in the H-type scraper 60.
  • the P-type holding body 92 also has a saw tooth arrangement 93 which forms a variably projecting wall portion 94 that, in this embodiment, extends longitudinally, or in the same direction, to varying extents of height along its length from a mounting wall portion 96 (as specifically shown in Fig. 17).
  • Bolts or studs 98 passing through holes in the mounting wall portion 96 connect the scraper 90 to the suspension arm and mounting assembly 22 (see Fig. 2) of the conveyor belt machine 10.
  • An L-shaped stepped portion 102 is formed on the holding body 92, and an L-section backing strip 66 of the assembled scraper element 64 is welded to the holding body 92 along a variable path which follows an outer line (or the outline) of the saw tooth arrangement 93 to form the aforementioned zig zag shaped welded joint 84.
  • the zig zag shaped welded joint 84 of the scraper 90 significantly prolongs the useful life of the scraper 90 compared to the much shorter useful life of the prior art scrapers, for the reasons mentioned above with reference to scraper 60.
  • FIGs. 18 and 19 Another conveyor belt scraper or belt cleaner tip 110 according to a more specific third embodiment of the present invention is shown in Figs. 18 and 19.
  • the scraper 110 is of the R- type, but has a modified R-type holding body 112, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, to which is secured the same modified scraper element 64 as used in the H-type scraper 60 and the P-type scraper 90.
  • the R-type holding body 112 also has a saw tooth arrangement 113 which forms a variably projecting wall portion 114 that, in this embodiment, extends longitudinally, or in the same direction, to varying extents of height along its length from a mounting wall portion 116 (as specifically shown in Fig. 18).
  • Bolts or studs 118 passing through holes in the mounting wall portion 116 connect the scraper 110 to the suspension arm and mounting assembly 24 (see Fig. 2) of the conveyor belt machine 10.
  • An L-shaped stepped portion 122 is formed on the holding body 112, and an L-section backing strip 66 of the assembled scraper element 64 is welded to the holding body 112 along a variable path which follows an outer line (or the outline) of the saw tooth arrangement 113 to form the aforementioned zig zag shaped welded joint 84.
  • the zig zag shaped welded joint 84 of the scraper 110 significantly prolongs the useful life of the scraper 110 compared to the much shorter useful life of the prior art scrapers, for the reasons mentioned above with reference to scrapers 60 and 90.
  • the prior art HT-type scraper 130 shown in Figs. 21 to 24 is connected to a dedicated suspension arm and mounting assembly 132 (see Fig. 21) of the conveyor belt machine 10.
  • the prior art HT-type scraper 130 has a HT-type holding body 134 to which are secured two scraper elements 136, 138 on opposite sides of the holding body 134.
  • the first scraper element 136 which utilizes four pieces or blades 140 of tungsten carbide, initially cleans conveyed material which adheres to the surface on the return side 13 of the belt 11
  • the second scraper element 138 which also utilizes four pieces or blades 144 of tungsten carbide but is located on the holding body 134 remotely of the belt 11, physically protects the stud 141 and its nut from being damaged by collision with conveyed bulk material falling from the top of the belt 11.
  • the prior art HT-type scraper 130 includes two conventional trilay structures 30 sandwiched between respective stepped portions 146, 148 of the holding body 134 and respective blades 140, 144 of tungsten carbide separated end-to-end by expansion joints 150, 152 for reasons described earlier, and the blades 140, 144 of tungsten carbide are joined to the holding body 134 on opposite sides thereof by a brazing process.
  • the scraper 160 is of the HT- type, but has a modified HT-type holding body 162, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, to which is secured a modified scraper element 164 of a different structure to that used in the H- type scraper 60, the P-type scraper 90 and the R-type scraper 110.
  • the scraper element 164 as more clearly shown in Fig.
  • central planar or flatsection trilay structure 166 used in brazing processes, and preferably made of conventional filler material, a thin planar or flat-section backing strip 168 or plate, preferably made of stainless steel, but which may alternatively be made of mild steel or other suitable metal or alloy material, on one side of the trilay structure 166, and a single piece or blade 170 of tungsten carbide which provides both a scraping edge 171 on one side of the trilay structure 166 and a physical protection edge 172 for the stud 174 and its nut on the other side of the trilay structure 166.
  • the flat-section backing strip 168 is joined along at least one first surface thereof to the holding body 162.
  • the flat-section backing strip 168 is also joined along at least one opposite second surface thereof to the single piece 170 of tungsten carbide via the trilay structure 166.
  • a suitable brazing process is used to braze the flat-section trilay structure 166 securely between the flat-section backing strip 168 and the single piece 170 of tungsten carbide to form or assemble the scraper element 164 in a first step of assembling the belt scraper 160.
  • an induction brazing process is used to melt the filler material of the trilay structure 166 so that it flows and effectively joins the single blade 170 of tungsten carbide to the holding body 162.
  • induction brazing has been used in this embodiment of the invention, other suitable techniques of brazing may alternatively be used, such as silver brazing, which is sometimes known as hard soldering.
  • the trilay structure 166 must comprise a filler material having a lower melting point than the two surfaces being joined.
  • a metal filler material having two outer strips (or layers) comprising predominantly of silver with lower concentrations of other common filler metals, such as zinc, nickel, manganese and optionally cadmium, clad onto a core strip of copper can be used.
  • the filler material will become molten when sufficiently heated by electromagnetic induction and then flow by capillary action to bond together the two surfaces to form the joint when cooled.
  • the flat-section backing strip 168 of the assembled scraper element 164 is then secured to a flat top surface of the holding body 162, in a second step of assembling the belt scraper 160, by a suitable welding process, such as laser welding, or possibly by plasma welding, or by traditional TIG welding or MIG welding, or by a suitable fastening process which utilizes mechanical fasteners or other connecting devices.
  • a suitable welding process such as laser welding, or possibly by plasma welding, or by traditional TIG welding or MIG welding, or by a suitable fastening process which utilizes mechanical fasteners or other connecting devices.
  • this may be primarily attributable to the use of the backing strip 168 to which the single blade 170 of tungsten carbide is brazed, and which is made of the same, or similar, material (especially in its thermal properties) as that of the holding body 162.
  • Those features enable the facing surfaces of the backing strip 168 and the holding body 162 to be joined in the second step by heating, such as by welding, at a lower temperature than that which is used in the prior art, where there is no use of a backing strip, and where the higher temperature process of brazing is used to join the plurality of tungsten carbide blades to the holding body via the trilay structure to form or assemble the prior art belt scraper in a single step.
  • the HT-type holding body 162 has a wave surface arrangement 180 which forms a variably projecting wall portion 182 that, in this embodiment, extends perpendicularly to varying extents of height along its length from a larger mounting wall portion 184 (as specifically shown in Fig. 26).
  • the holding body 162 of scraper 160 does not have an L- shaped stepped portion.
  • the flat-section backing strip 168 of the assembled scraper element 164 is positioned flat on the adjoining top surfaces of the variably projecting wall portion 182 and mounting wall portion 184 of the holding body 162, and is welded thereto along a variable path which follows an outer line (or the outline) of the wave surface arrangement 180 of the variably projecting wall portion 182 to form a wave surface shaped welded joint 186.
  • the non-linear or variable path of the wave surface shaped welded joint 186 significantly prolongs the useful life of the scraper 160 compared to the much shorter useful life of the prior art scrapers.
  • the scraper 160 can remain operational for as long as there is sufficiently strong bonding by at least some parts of the wave surface shaped welded joint 186 between the scraper element 164 and the variably projecting wall portion 182, even though prolonged use may cause progressive and gradual wearing away of parts of both the scraper element 164 and the variably projecting wall portion 182, and of parts of the wave surface shaped welded joint 186 which are closer to the scraping edge 171 of the scraper element 164 than to the mounting wall portion 184.
  • the holding bodies 62, 92, 112, 162 of the preferred belt scrapers of the present invention may be made, as alternatives to stainless steel or mild steel, of any suitable metal or alloy material, so long as this material is compatible and at least substantially similar in its thermal properties, for reasons apparent from the above description, with the material from which the backing strip is made, which may also be alternatively made of any suitable metal or alloy material.
  • the welded joints 84, 186 may, in other suitable embodiments of the present invention, take different shapes, forms and configurations, depending on the structure or shape of the projecting wall portion.
  • the projecting wall portion may include one or more holes (of any suitable shape), and along the or each inner edge of such holes may be formed a welded joint between the backing strip of the assembled scraper element and the projecting wall portion of the holding body.
  • the outer profile structure (or projecting edge shape) of the projecting wall portion rather than being a saw tooth arrangement 113 or a wave surface arrangement 180, may be a castellated arrangement, or any other suitable outer profile structure or shape.
  • the present invention may be applicable to many types of conveyor belt scraper, not only to the H, R, P and HT-types described above, but also to Y, HEL and HMLL-types of scrapers, or any other suitable scraper types.
  • the scrapers of the present invention do not always require an L-shaped stepped portion to be formed in the holding body thereof. This is because the L-section backing strip itself provides an L-shaped stepped portion when one of the two outer flat sides of the L-section backing strip is secured to a flat surface region of a mounting wall portion, or to a flat surface region of a projecting wall portion positioned at an end of a mounting wall portion.
  • the scrapers of this type it is still necessary that there is sufficiently strong bonding by at least some parts of the welded joint between the scraper element and the selected flat surface region of the wall portion to ensure the scraper remains operational during prolonged use.
  • a significant further advantage is that only a single piece or blade of tungsten carbide is necessary to create an assembled scraper element which extends substantially the length of the holding body of the scraper, and that this contributes to a significant saving of time, labour and cost in the manufacture of such scrapers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Belt Conveyors (AREA)
  • Cleaning In General (AREA)

Abstract

La présente invention concerne un racleur (60) ou une pointe de nettoyage pour une courroie (11) d'une machine à bande transporteuse (10) qui présente un corps de retenue (62) constitué d'un premier métal ou matériau d'alliage. Le corps de retenue est conçu ou adapté pour être relié à un ensemble support (20) de la machine à bande transporteuse. Le racleur comporte également un élément racleur (64) relié au corps de retenue. L'élément racleur est conçu ou adapté pour racler de la courroie tout matériau transporté (12) qui a adhéré à la courroie. L'élément racleur a une seule lame (70) de carbure de tungstène jointe par brasage à une bande de support (66). La bande de support est constituée d'un second métal ou matériau d'alliage qui est identique ou similaire en termes de propriétés thermiques au premier métal ou au matériau d'alliage du corps de retenue. La bande de support de l'élément racleur ainsi assemblé (64) est ensuite reliée au corps de retenue. Le racleur selon l'invention est tel que la seule lame de carbure de tungstène s'étend sensiblement sur la longueur du corps de retenue.
PCT/AU2024/050755 2023-07-15 2024-07-15 Racleur de bande transporteuse Ceased WO2025015372A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP24841822.0A EP4743378A1 (fr) 2023-07-15 2024-07-15 Racleur de bande transporteuse
CN202480046600.3A CN121532344A (zh) 2023-07-15 2024-07-15 传送带刮刀
AU2024294281A AU2024294281A1 (en) 2023-07-15 2024-07-15 Conveyor belt scraper
PE2026000046A PE20260925A1 (es) 2023-07-15 2024-07-15 Raspador para correa transportadora
JP2026525294A JP2026525702A (ja) 2023-07-15 2024-07-15 コンベアベルトスクレーパ
CL2026000014A CL2026000014A1 (es) 2023-07-15 2026-01-05 Raspador para correa transportadora.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2023902268A AU2023902268A0 (en) 2023-07-15 Conveyor Belt Scraper
AU2023902268 2023-07-15

Publications (1)

Publication Number Publication Date
WO2025015372A1 true WO2025015372A1 (fr) 2025-01-23

Family

ID=94281031

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2024/050755 Ceased WO2025015372A1 (fr) 2023-07-15 2024-07-15 Racleur de bande transporteuse

Country Status (7)

Country Link
EP (1) EP4743378A1 (fr)
JP (1) JP2026525702A (fr)
CN (1) CN121532344A (fr)
AU (1) AU2024294281A1 (fr)
CL (1) CL2026000014A1 (fr)
PE (1) PE20260925A1 (fr)
WO (1) WO2025015372A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2019100239A4 (en) * 2018-03-09 2019-04-18 Da Gama Industries Pty Ltd Conveyor Belt Scraper
AU2019101370A4 (en) * 2019-10-25 2019-12-12 Flexco (Aust) Pty Ltd Blade assembly
CN115108277A (zh) * 2022-07-28 2022-09-27 安徽戈巴迪智能装备股份有限公司 一种输送带清扫装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2019100239A4 (en) * 2018-03-09 2019-04-18 Da Gama Industries Pty Ltd Conveyor Belt Scraper
AU2019101370A4 (en) * 2019-10-25 2019-12-12 Flexco (Aust) Pty Ltd Blade assembly
CN115108277A (zh) * 2022-07-28 2022-09-27 安徽戈巴迪智能装备股份有限公司 一种输送带清扫装置

Also Published As

Publication number Publication date
JP2026525702A (ja) 2026-07-31
AU2024294281A1 (en) 2026-02-05
EP4743378A1 (fr) 2026-05-20
PE20260925A1 (es) 2026-04-29
CL2026000014A1 (es) 2026-04-24
CN121532344A (zh) 2026-02-13

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