Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/12—Apparatus having only parallel elements
  • B07B1/14—Roller screens
  • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
  • B07B1/155—Roller screens using corrugated, grooved or ribbed rollers the rollers having a star shaped cross section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
  • B07B1/50—Cleaning
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/12—Apparatus having only parallel elements
  • B07B1/14—Roller screens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
  • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
  • B07B1/50—Cleaning
  • B07B1/52—Cleaning with brushes or scrapers
  • B07B1/526—Cleaning with brushes or scrapers with scrapers

Definitions

• the invention relates to a disc screen for dividing a flow of material into several particle sizes, the disc screen comprising a body; a plurality of parallel axles spaced apart from one another and rotatably arranged in the body; an actuator for rotating said rotatable axles about their longitudinal axis; a plurality of screen discs spaced apart from one another and arranged fixedly on said axles, the screen discs of one axle being axially offset with respect to the screen discs of an adjacent axle; a plurality of material entanglement prevention means arranged between the screen discs; the entanglement prevention means comprising an inner sleeve placed on the axle non-rotatably with respect thereto; an outer sleeve arrangement freely rotatably arranged on the inner sleeve; and a stabilization arrangement arranged in the outer sleeve arrangement for preventing the outer sleeve arrangement from rotating along with the axle and the inner sleeve.
• the invention separately also relates to this material entanglement
• a disc screen is probably the most widely used screen type for dividing a flow of material into two or more particle sizes.
• Several different variations of a disc screen are known. The most common ones include screens equipped with fixed steel discs. Depending on the material to be screened, the shape of the screen discs may vary significantly. Typical shapes have three to seven corners such that a side between the corners may be straight, curved or even concave.
• Another large device group is that of disc screens whose discs are differently shaped stars made of a flexible material and provided with different numbers of points.
• Screens equipped with fixed steel discs are usually used for materials which do not contain hard particles, such as rocks or metal.
• materials to be screened are, inter alia, chips and peat.
• Finger discs (stars) made of flexible materials are applied where the screen is very likely to be stuck.
• Such materials are, inter alia, building demolition waste, recycled fuels, vegetables, etc.
• Such a strip-like material can be found, inter alia, among building demolition waste, such as belts, electric lines, and so forth, as well as in connection with recycled fuels, such as video tapes, cloths, etc.
• building demolition waste such as belts, electric lines, and so forth
• recycled fuels such as video tapes, cloths, etc.
• Such known cleansing elements include, inter alia, hard scrapers that are disclosed in patents DE 10 2010 023 268 Al and DE 20 2012 005 012 and attached to the stars, and separate intermediate space cleansers known, inter alia, from patent EP 1 764 163 Bl.
• the first-mentioned methods are suitable for removing a material stuck in the intermediate spaces between the discs, but are ineffective against strip-like entanglements.
• a separate cleanser is an expensive and space-consuming solution, and not particularly efficient for removing entangled materials.
• the sleeves of the double sleeve may be either concentric or eccentric.
• the problem with the structure is that over time, as dirt and moisture get inside the structure, its operating characteristics deteriorate significantly. Further, the shape of the sleeve structure constitutes no natural obstacle to the entanglement of the material.
• An object of the invention is thus to develop the above- described disc screen and material entanglement prevention means so as to enable the aforementioned problems to be solved.
• This object is achieved by the disc screen and entanglement prevention means according to the invention, which are characterized in that the stabilization arrangement comprises a weight arranged in a selected sector on an outer surface of the outer sleeve arrangement.
• a particularly advantageous implementation is one in which between the inner sleeve and the outer sleeve is arranged a bearing system, a rolling bearing system in particular.
• the solution according to the invention avoids the aforementioned problems and enables entanglement of a strip-like material to be prevented or at least considerably reduced.
• This invention significantly reduces this entanglement problem and the related disadvantages.
• Figure 1 is a general perspective view showing a disc screen as a star screen application
• Figure 2 shows an entanglement prevention means placed between two screen discs
• Figure 3 shows, sectioned, the screen discs and entanglement prevention means of Figure 2;
• Figure 4 shows, separately and sectioned, the entanglement prevention means seen in Figures 2 and 3;
• Figure 5 shows some alternative weights for an entanglement prevention means
• Figure 6 shows removal of a material wound around the entanglement prevention means.
• a disc screen for dividing a flow of material into several particle sizes comprises a body 1; a plurality of parallel axles 2 spaced apart from one another in the same plane and rotatably arranged in the body 1; an actuator 3 for rotating the rotatable axles 2 about their longitudinal axis; and a plurality of screen discs 4 spaced preferably equally apart from one another and arranged fixedly on the axles 2.
• the screen discs 4 of one axle 2 are axially offset with respect to the screen discs 4 of an adjacent axle 2.
• the screen discs 4 of one axle 2 typically extend between the screen discs 4 of the adjacent axle 2, in which case the axial and radial distances of the screen discs 4 from one another provide dimensions for the largest particle size passing the screen.
• the screen discs 4 are star-shaped and thus comprise radially protruding points 4a.
• the screen discs 4 may, however, be of any type set forth in the above-described prior art wherein the shape of the outer circumference varies according to use and need.
• the disc screen in question also comprises an entanglement prevention means 5 preferably arranged in each screen disc intermediate space and comprising an inner sleeve 6 non-rotatably placed on the axle 2 having a polygonal cross section by means of a corresponding polygonal central hole 6a of the inner sleeve 6 (like the screen discs 4 themselves); an outer sleeve arrangement 7 freely rotatably arranged on the inner sleeve 6; and a stabilization arrangement 8 arranged in the outer sleeve arrangement 7 for preventing the outer sleeve arrangement 7 from rotating along with the axle 2 and the inner sleeve 6.
• the non-rotability of the inner sleeve 6 with respect to the axle 2 may, of course, be also implemented in many ways other than that described above, for instance by wedges or even by gluing.
• the length of the inner sleeve 6 is selected such that its ends are pressed against hubs 4b of the screen discs 4.
• the axle 2 and the screen discs 4 attached thereto and the inner sleeves 6 thus together form a rotating entity.
• a bearing system preferably a rolling bearing system 9.
• the length of the outer sleeve arrangement 7, in turn, is then selected such that its ends do not extend to the sides of the screen discs 4, in which case the rotating motion of the entity formed by the axle 2, the screen discs 4 and the inner sleeve 6 is not transmitted to this outer sleeve arrangement 7 but it stays in place owing to the sensitive bearing system 9 and the stabilization arrangement 8.
• the stabilization arrangement 8 It is essential for the stabilization arrangement 8 to be formed of a weight 8 arranged in a selected sector on an outer surface of the outer sleeve arrangement 7.
• the magnitude, dimensions and shape of the weight 8 may be selected as necessary.
• the appropriately selected dimensions and shapes enable the entanglement of a material to be reduced considerably. Since the weight 8 resides on the outer surface of the outer sleeve arrangement 7, the shaping of the weight 8 is only restricted by the free space available around it. If, however, entanglement of the material does occur, the advantageous shaping of the weight 8 enables a strip-like piece 11 in particular to be prevented from becoming closely pressed against the surface of the outer sleeve arrangement 7, making the piece easy to remove by scissoring, for instance (cf. Figure 6).
• the outer sleeve arrangement 7 naturally tends to settle in its correct position on account of gravity and the flow of material being screened, i.e. such that the weight 8 always resides down. It is therefore advantageous that the weight 8 and the outer sleeve arrangement 7 residing at it are also provided with liquid discharge openings 10 via which liquid, water especially, that has possibly entered the space between the inner sleeve 6 and the outer sleeve arrangement 7 is allowed to be discharged therefrom.
• the weight 8 may be a separate part or it may be integrated with the outer sleeve arrangement 7 into one piece. In addition, the weight 8 may be divided in several sectors on the surface of the outer sleeve arrangement 7. Different weight shapes are shown in Figure 5.
• a bearing shaft of the bearing system 9 is coaxial with a central axis of the axle 2, but the bearing shaft of the bearing system 9 may also be offset from the central axis of the axle 2, i.e. eccentrically with respect to the central axis of the axle 2.

Landscapes

• Combined Means For Separation Of Solids (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=57744908

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (5)

• 2015
  • 2015-11-10 FI FI20155821A patent/FI126489B/fi not_active IP Right Cessation
• 2016
  • 2016-11-07 EP EP16863729.6A patent/EP3374097A4/de not_active Withdrawn
  • 2016-11-07 WO PCT/FI2016/050786 patent/WO2017081365A1/en active Application Filing

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