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
  • B65G45/16—Cleaning devices comprising scrapers with scraper biasing means
• • 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

Definitions

• the present invention relates to a conveyor belt scraper device and a scarper blade of the type defined in the preambles of claims 1 and 4, respectively.
• EP-B-0,262,272 describes a belt scraper device and a scraper blade of this type.
• This known device has a sup ⁇ porting element with a longitudinal undercut mounting re ⁇ cess whose longitudinal opening is defined by two inwardly directed flanges.
• In the recess there is mounted at least one scraper blade, one end of which forms a scraper tip and the other end of which is inserted in the mounting recess and has a substantially complementary shape with respect to the recess, a plastic-to-plastic sliding con- tact surface being aimed at.
• the long sides of the scraper blade are formed with grooves for receiving said flanges.
• This prior-art belt scraper device certainly has the ad ⁇ vantage of using exchangeable scaper blades which can be pushed into and retracted from the undercut mounting re- cess of the supporting section.
• this device places specific demands on the material of the scraper blades, which must be made of plastic having a low fric ⁇ tion coefficient, yet be sufficiently rigid to be able to perform their scraping function properly.
• One object of the present invention therefore is pro ⁇ vide an improved belt scraper device and an improved scraper blade with extended options as to the choice of material, without impairing the scraper function.
• the novelty of the invention thus resides in the pro ⁇ vision of scraper blades formed with a slot extending through the interior of the scraper blade for receiving a stiffening member which is inserted in the undercut mount ⁇ ing recess of the supporting section together with the scraper blade.
• This concept is not previously known, either from US- A-4,825,996 or the counterpart EP-A-0,252,188, also relat ⁇ ing to a belt scraper device.
• This known device has a sup ⁇ porting section with an upwardly open recess, at the center of which there is provided an upwardly directly flange of T-shaped cross-section.
• the mounting base of the scraper blade has a T-shaped groove into which the T-shaped flange extends when the scraper blade is mounted.
• the cross bar of the T-flange is on a level with the edge at the mouth of the upwardly open recess of the supporting section. Conse ⁇ quently, the T-flange will not have a stiffening effect on the scraper blade proper. Therefore, the present invention cannot be considered disclosed by this US patent or its European counterpart.
• the invention will be described in more detail herein ⁇ after with reference to the accompanying drawings illust ⁇ rating an embodiment of an inventive belt scraper device and an inventive scraper blade.
• Fig. 1 schematically illustrates a belt scraper device and a scraper blade according to the invention, as well as parts of a conveyor belt drum and a conveyor belt passing thereon.
• Fig. 2 is a cross-section of a scraper blade included in the device of Fig. 1.
• Fig. 3 is a cross-section of a supporting structure includ ⁇ ed in the belt scraper device of Fig. 1.
• Fig. 4 shows a modification of the belt scraper device and the scraper blade of Fig. 1.
• Fig. 5 is a perspective view of an embodiment of a device according to the invention.
• Fig. 1 shows an embodiment of a belt scraper device according to the present invention.
• the device comprises a supporting element 10 having a longitudinal undercut mount- ing recess 11.
• the supporting element consists of a flexurally rigid material, preferably steel or any other metal.
• the longitudinal opening 12 of the mounting recess is defined by two inwardly directly flanges 13.
• the sup ⁇ porting element 10 may be designed as an integral unit com ⁇ prising an extruded or rolled section bar which forms part of a tensioning device urging the belt scraper against the belt and in which the undercut recess 11 is formed.
• the recess 11 can be designed in a separate sectional element 28 de- tachably mounted on a bar 27 being part of the tensioning device.
• the device further comprises at least one scraper blade 14 mounted in the mounting recess.
• the scraper blade may consist of rubber material or any other elastomer or plastic material having high resistance to wear and abra ⁇ sion and appropriate rigidity.
• a currently preferred mate- rial is polyurethane.
• scraper blades 14 which are inserted successiv ⁇ ely into the mounting recess 11 to form a scraper device of sufficient width.
• One end of the scraper blade 14 forms a scraper tip 15 and the other end forms a mounting base 16.
• the scraper blade is generally tapering from the outer end of the mounting base to the scraper tip 15.
• the mounting base 16 is inserted in the mounting recess and has a substantially complementary shape with respect to the recess.
• the late ⁇ ral surfaces of the mounting base are formed with mounting grooves 17 for receiving the inwardly directed flanges 13, such that the scraper blade is firmly retained in the un ⁇ dercut recess 11 which is formed in the supporting element 10 and whose opening is defined by the flanges 13.
• the scraper blade 14 has a longitudinal slot 18 commencing at the end surface of the scaper blade and extending between the flanges 13 of the mounting recess and a considerable distance beyond these in the outward direction towards the scraper tip 15.
• a T-shaped stiffening member 19 is inserted in the longitu- dinal slot 18 for stiffening the scraper blade 14.
• the stif ening member 19 extends a considerable distance beyond the mounting grooves 17 in the outward direction towards the scraper tip 15.
• This design of the scraper blade and the scraper device confers greater free ⁇ dom when choosing a suitable material quality for the scra per blade, since the required rigidity of the scraper blad is produced to a considerable extent by the stem or web 20 of the stiffening member 19 extending into the slot 18.
• the slot 18 and the web 20 extend approximately halfway up to the scraper tip 15.
• the overall flexural rigidity of the scraper can be modified.
• the overall flexural rigidity of the scraper can thus be varied not only by changing the material and the thickness of the scraper blade, but also by changing- the length by which the stiffening member extends into the scraper blade.
• the cross bar or flange 21 of the stiffening member 19 has a slightly shorter width than the mounting base 16 of the scraper, the rubber or plastic material of the scraper forming projections 22 for filling the mounting recess 11.
• a shallow depression 23 is defined between the projections 22. In this embodiment, this depression and the slot 18 together form a T-shaped recess in the scraper blade.
• Figs 4 and 5 has no such projections Instead, the cross bar or flange 21 is substantially equall wide as the bottom of the mounting recess 11 and the end surface of the mounting base 16.
• the stiffening member 19 and the scraper blade 14 may have the same extent, counting in the longitudinal direc ⁇ tion of the supporting element 10. In wide conveyor belts where several scraper blades must be disposed beside each other, it is however possible to use a single long stiff ⁇ ening member 19 for several successive scraper blades 14.
• the insertion of a stiffening member 19 in the scra ⁇ per blades further confers the advantage of a good, un ⁇ yielding engagement between hard components of the scraper and the supporting element 10, which is considered to en- hance the possibilities of producing the desired applica ⁇ tion pressure at the scraper tip 15.
• the stiff ⁇ ening member increases the resistance of the scraper to forces tending to urge the scraper out of the supporting element, in the case of strong bending stresses which are directed out from the conveyor belt (that is, flexural forces tending to bend the scraper anticlockwise with re ⁇ spect to Fig. 1).
• the stem or web 20 of the stiffening member 19 has a length equal to the depth of the slot 18 in the scraper 14.
• the belt scraper device is mounted such that the tip 15 of the scraper is urged against the conveyor belt 24 when this passes around the belt drum 25 rotating anticlockwise in Fig. 1.
• the belt scraper can be pressed against the conveyor belt in cus ⁇ tomary manner by conventional means which are not shown in Fig. 1 and which exert a force on the belt scraper, tend ⁇ ing to displace the scraper tip 15 to the right in Fig. 1.
• These means may be pneumatic or hydraulic de ⁇ vices, spring devices or other mechanical devices.
• mechanical devices are shown for ur- ging the belt scraper against the conveyor belt.
• Fig. 5 shows another embodiment of a device according to the invention.
• a conveyor belt 24 runs clockwise around a conveyor belt drum 25.
• a scraper device having scrapers 14 are pressed against the conveyor belt, to enable the tips 15 of the scrapers 14 to remove any material adhering to the conveyor belt surface.
• the scrapers 14 are designed as shown in Fig. 4, a T-shaped sectional member 19 extend ⁇ ing into the centrally disposed slot 18 in the scrapers. In this case, the T-shaped member 19 is common to all the individual scrapers 14 which together cover the required width of the conveyor belt 24.
• the supporting element 10 in this case consists of two parts, namely a rotatable shaft 26 with a square tube 27 rigidly mounted thereon, and a holder 28 which is readily mounted on and dismounted from the square tube and in which the mounting recess 11 is formed.
• the advantage of this design is that the holder 28, with the scraper blades mounted thereon, can be easily and quickly mounted and dismounted as a single unit.
• a cotter pin 32 inserted through the holes 29 and the corre ⁇ sponding holes in the square tube is also used for retain ⁇ ing the holder.
• Fig. 5 are further used set screws 33 screwed in the holder 28 and preventing uninten ⁇ tional displacement of the scraper blades 14 and the T-sha ⁇ ped member 19 in the longitudinal direction of the holder 28.
• Fig. 5 further shows a mechanical device 34 for urging the belt scraper against the conveyor belt.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Structure Of Belt Conveyors (AREA)
• Belt Conveyors (AREA)
• Paper (AREA)
• Branching, Merging, And Special Transfer Between Conveyors (AREA)
• Chain Conveyers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20384953

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (54)

Citations (4)

Family Cites Families (3)

• 1992
  • 1992-01-02 SE SE9200013A patent/SE468390B/sv not_active IP Right Cessation
  • 1992-02-26 US US07/841,413 patent/US5197587A/en not_active Expired - Lifetime
• 1993
  • 1993-01-04 DE DE4390006T patent/DE4390006T1/de active Pending
  • 1993-01-04 DE DE4390006A patent/DE4390006C2/de not_active Expired - Fee Related
  • 1993-01-04 WO PCT/SE1993/000001 patent/WO1993013000A1/en active Application Filing
  • 1993-01-04 AU AU32714/93A patent/AU3271493A/en not_active Abandoned

Patent Citations (4)

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