EP1391251A2 - Nettoyage d'agrégats - Google Patents

Nettoyage d'agrégats Download PDF

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Publication number
EP1391251A2
EP1391251A2 EP03255221A EP03255221A EP1391251A2 EP 1391251 A2 EP1391251 A2 EP 1391251A2 EP 03255221 A EP03255221 A EP 03255221A EP 03255221 A EP03255221 A EP 03255221A EP 1391251 A2 EP1391251 A2 EP 1391251A2
Authority
EP
European Patent Office
Prior art keywords
aggregate
debris
dirty
cleaning
mesh
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.)
Withdrawn
Application number
EP03255221A
Other languages
German (de)
English (en)
Other versions
EP1391251A3 (fr
Inventor
Darren Nelson
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.)
DOMEWOOD LIMITED
Original Assignee
Carnell Contractors 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
Application filed by Carnell Contractors Ltd filed Critical Carnell Contractors Ltd
Publication of EP1391251A2 publication Critical patent/EP1391251A2/fr
Publication of EP1391251A3 publication Critical patent/EP1391251A3/fr
Withdrawn legal-status Critical Current

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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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L25/00—Domestic cleaning devices not provided for in other groups of this subclass 
    • 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
    • B07B1/005—Transportable screening plants
    • 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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • 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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • B07B1/24—Revolving drums with fixed or moving interior agitators
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/06—Renewing or cleaning the ballast in situ, with or without concurrent work on the track

Definitions

  • the present invention relates to aggregate cleaning and more particularly but not exclusively to drain aggregate cleaning with respect to so-called French drains associated with roads and highways.
  • a French drain comprises a trench or ditch filled with relatively large stones or aggregate in order to act as a soakaway for the surface water flowing under gravity towards the drain.
  • apparatus for cleaning aggregate comprising aggregate feed means for dirty aggregate, cleaning means, aggregate return means for cleaned aggregate and debris distribution means, the aggregate feed means in use presenting dirty aggregate to the cleaning means comprises a mesh whereby motion within the cleaning means agitates the dirty aggregate to release debris from the dirty aggregate with the cleaned aggregate presented to the aggregate return means whilst debris is presented to the debris distribution means.
  • the motion is rotation.
  • the cleaning means takes the form of a drum rotated about a central axis.
  • the mesh is concentric about an axis of rotation.
  • the mesh performs an epicyclic rotation.
  • the aggregate feed means is a hopper with a conveyer to progressively deliver dirty aggregate to the cleaning means.
  • the dirty aggregate is arranged to drop from the conveyor upon the cleaning means for abrupt percussive shock engagement therewith to facilitate debris released from the dirty aggregate.
  • the mesh has an interstitial or aperture size determined by the expected minimum aggregate dimension.
  • the mesh interstitial or aperture size is approximately 10mm.
  • the mesh can be readily changed within the cleaning means to accommodate different aggregate sizes.
  • the mesh interstitial or aperture size can be adjusted.
  • the mesh is formed by a plurality of panels.
  • the apparatus includes agitator means.
  • the agitator means comprises elongate ribs appropriately spaced about the cleaning means. Possibly, the elongate ribs extend substantially from one end of the screen to the other. Normally, the ribs will be straight. Alternatively, the ribs will be bent, spiralled or wavy along an internal surface of the cleaning means. Typically, the ribs will be substantially V-shaped to sweep aggregate with them as the mesh rotates until released under gravity in a tumbling action for shock and abrasive debris release.
  • the cleaning means is angled.
  • the cleaning means is higher at a feed end which receives the dirty aggregate from the feed means.
  • the angle of the cleaning means is adjustable. Possibly, the angle of the cleaning means could be adjusted through a hydraulic or pneumatic ram or by adjusting the height of the hydraulic suspension on the attending articulated tractor unit so lifting the fifth wheel.
  • the cleaned aggregate falls from the cleaning means upon a conveyor for the aggregate return means.
  • the debris falls through the mesh upon a conveyor for the debris distribution means.
  • the debris distribution means includes a shredder to shred the debris to finer grade particles. Possibly, the shredder is a chopper or shearing blade arrangement.
  • the debris distribution means will include a scatter disc to disperse the debris.
  • the distribution means presents the debris to a separator dependent upon type of debris. Possibly, the separator operates dependent upon debris weight. Alternatively, the separator comprises a manually operated diverter. Possibly, the distribution means presents the debris to a collector.
  • brush means sweeps the mesh to facilitate removal of debris from the mesh.
  • the distribution means includes a guard to limit scatter of debris.
  • a star conveyor is provided between the aggregate feed means and the cleaning means in order to provide initial debris release from the dirty aggregate.
  • the star conveyor comprises a plurality of star axle wheels with inter-engaging flexible fingers which promote transport of the aggregate towards the cleaning means whilst achieving desirable percussive shock engagement to dislodge debris from the dirty aggregate whereby that debris falls through the star conveyor.
  • an arrangement comprising apparatus as described above and dirty aggregate extraction means arranged to extract dirty aggregate from a trench or ditch and present that dirty aggregate to the aggregate feed means.
  • the extraction means includes a helical screw arranged to lift dirty aggregate towards the feed means or vacuum suction or backhoe bucket.
  • the extractor means includes compressed air jets to facilitate the release of dirty aggregate conglomeration and so extraction.
  • the air-jets are located upon the screw edges.
  • the extractor means includes an extendible arm to facilitate access to dirty aggregate.
  • This may be incorporated on the trailer or on a separate vehicle such as a small excavator.
  • the apparatus as described previously and/or the dirty aggregate extraction means are provided upon a self-propelling vehicle chassis or a vehicle trailer readily towed for operational use.
  • the method includes the step of selectively angling the orientation of the mesh to facilitate agitation for release of debris and/or speed of operation.
  • the method includes the step of analysing the debris to determine acceptability for shredding and/or scattering.
  • the method includes separating the debris dependent upon type whereby a proportion of the debris is scattered whilst the remainder is directed towards a collector for appropriate disposal.
  • the present invention particularly relates to an apparatus for cleaning aggregate and in particular aggregate taken from so-called French drains.
  • the apparatus is also part of an arrangement for extraction of aggregate and return of that aggregate to a French drain trench or ditch.
  • the present invention also incorporates a method of aggregate cleaning.
  • Fig. 1 illustrates, in a schematic cross-section, a cleaning apparatus 100 located upon a trailer 2 which is normally towed by a truck or tractor unit 1.
  • the apparatus 100 can be readily transported to a site for operation.
  • the cleaning apparatus 100 will be driven by a hydraulic power unit 3 is a self contained engine/hydraulic power pack not dependent on the engine of truck 1.
  • the present cleaning apparatus will be combined with an excavator for dirty aggregate from the French drain and normally a trailing compactor machine to level and flatten the returned cleaned aggregate to the drain.
  • a French drain consists of a trench adjacent to a highway or roadside edge which is filled with coarse aggregate material of irregular shape and normally 30 to 40mm in diameter. Over a period of time the upper portions of the drain become blocked with silt, organic matter and highway debris. This blockage inhibits or even prevents drainage of surface water from the highway and thereabouts draining away to lower levels of the trench. Typically, only the top third or half of the drain aggregate becomes dirty and contaminated.
  • dirty aggregate 101 is loaded into an aggregate feed hopper 10 such that a dirty aggregate feed conveyor 11 progressively feeds the dirty aggregate to a cleaning combination.
  • the dirty or contaminated aggregate 101 may be scooped into the hopper 10 using a conventional backhoe or bucket excavation system or using a specific excavator as described later.
  • the cleaning combination is arranged such that an end 102 of the conveyor 11 drops dirty aggregate into shock percussive engagement with the cleaning combination to facilitate detachment of debris and break up of the possibly still partly conglomerated aggregate stones.
  • the cleaning combination is a drum mounted for rotation about a spindle and bearing 16 and guide rollers 17.
  • the cleaning combination comprises a mesh 15. Where necessary this mesh 15 may be reinforced with a perforated screen.
  • the mesh apertures or interstitial size are determined by the degree of cleaning and expected aggregate size. A mesh aperture or interstitial size of approximately 10mm will ensure aggregate with a normal dimension of 30 to 40mm will not pass through the cleaning combination whilst debris particles of less than 10mm will fall through the mesh. Cleaning is due to percussive action in tumbling and abrasion by sliding and rubbing against the mesh 15 and other aggregate particles during rotation.
  • the mesh 15 comprises a number of inter-linked panels such that the panels can be readily removed for cleaning, maintenance and repair. It will also be understood that using panels allows the mesh 15 to be specifically chosen or altered dependent upon expected aggregate dimensions and debris dimensions.
  • the mesh 15 is rotated about the bearing typically at the rear of the combination.
  • Guide rollers 17 facilitate stable rotation of the drum and mesh 15 about the axis of the drum.
  • a chain 19 through a sprocket drive and gear motor system 18 provides rotation of the cleaning combination about the drum axis. The speed of rotation can be varied dependent upon the degree of cleaning required. It will be understood that cleaning of the dirty aggregate is principally provided by agitation and abrasion between the aggregate stones themselves and surfaces of the cleaning combination.
  • the cleaning combination is normally angled as depicted in Fig. 1 such that the dirty aggregate falls from the feed end 102 to an exit end 103 under gravity.
  • the angle of the cleaning combination and speed of rotation will determine the residence time of dirty aggregate within the cleaning combination and therefore the speed of cleaning.
  • the inner surface of the mesh 15 will include agitators. These agitators may be part of the mesh 15 structure or separate elements located between mesh panels. These agitators take the form of ribs which extend radially and/or longitudinally at appropriate locations along the length of the cleaning combination. The agitators are provided in order to further facilitate debris release from the dirty or contaminated aggregate.
  • the cleaning apparatus is contained within a cover 4 in order to provide environmental protection from rain, etc, and airborne debris whilst preventing release of such debris about the apparatus as a result of the aggregate cleaning operation.
  • the cleaning combination is mounted upon a frame 13 which in turn is secured to a chassis 12 of the trailer 2.
  • a truck 1 is used to bring the cleaning apparatus to site.
  • the present cleaning apparatus could be incorporated in a self-propelled vehicle.
  • the means of inclining the apparatus using the tractor unit hydraulic suspension may be replaced with independent height adjustment or by inclination of the drum by mounting the drum frame on a rear pivot and lifting the front end by means of a hydraulic ram.
  • the angle of tilt for the cleaning combination can be adjusted as indicated previously for speed of cleaning operation and or effectiveness of such operation. It will be appreciated that the greater the angle the greater will be the promotion of a tumbling action in the aggregate from the feed end 102 to the exit end 103 under gravitational force.
  • a cleaning arrangement in accordance with the present invention comprising the present cleaning apparatus 100 with a dirty aggregate excavator machine and a cleaned aggregate return mechanism which will each move together along a drain in a continuous process.
  • the angle of the cleaning combination determined through the height of the tractor unit suspension height along with the speed of rotation will principally determine the rate of throughput of aggregate and so the speed with which the cleaning arrangement can move.
  • Cleaned aggregate 104 falls from the exit end 103 into a cleaned aggregate hopper 41.
  • a cleaned aggregate conveyor 42 then directs the cleaned aggregate towards a exit chute 44 for return to a drain trench.
  • the cleaned aggregate will then be levelled and flattened by appropriate machinery.
  • the rate of return of cleaned aggregate is controlled by the chute 44 release aperture along with the angular attitude of the exit chute 44. This angular attitude is determined by an exit conveyor hydraulic ram 43 as required.
  • contaminant debris falls through apertures in the mesh 15 of the cleaning combination and onto a debris conveyor 30.
  • the contaminant debris is then conveyed by further conveyors 31, 34 to a dispersion arrangement.
  • a debris hopper 33 is provided from which the debris is progressively presented to the dispersion arrangement to be appropriately dealt with.
  • the angles of the conveyor 34 are set by hydraulic rams 35 such that the dispersion arrangement is at a relatively elevated position for spraying the debris about an embankment or other area adjacent to the cleaning apparatus.
  • the cleaning combination is generally located within an outer skin 20 so that debris can not escape. Furthermore, brush elements will be provided in order to sweep the mesh 15 and so release the debris to the conveyor 30 for dispersal as described.
  • the dispersion arrangement comprises a dispersion disc 36 which is horizontal with a multiplicity of blades in order to scatter those particles 105 within a desired arc towards the embankment or other area.
  • a motor 37 is provided in order to rotate the disc with sufficient force to provide scattering of debris particles 105.
  • a guard screen 38 is provided in order to prevent debris particles being directed back towards the cleaning apparatus 100 or workers.
  • An up-lift conveyor 31 or the hopper conveyor 34 or any other means may be provided in order to deliver the debris to a separator (not shown) or holding tank.
  • the debris may be selected dependent upon its toxicity, weight or other characteristic. In such circumstances, only inert or environmentally acceptable debris will be scattered by the dispersion arrangement.
  • the cleaning apparatus During transit the cleaning apparatus will be arranged whereby the cleaning combination will be at its lowest angular position and the conveyors 34 and 42 retracted by the hydraulic rams 35 and 43 respectively.
  • Fig. 2 is a plan cross-section of a cleaning apparatus 100 in accordance with the present invention.
  • dirty or contaminated aggregate 101 is loaded into hopper 10 and taken by conveyor 11 to the cleaning combination including mesh 15.
  • the cleaned aggregate 104 is returned through chute 42 whilst the debris 105 is scattered by a dispersion disc 36.
  • the aggregate and therefore the French drain from which the aggregate 101 is removed can be either side of the cleaning apparatus 101.
  • the conveyors 34 and 42 can be respectively rotated as shown by arrowheads A and B.
  • the cleaned aggregate 104 can be returned to a drain trench or ditch either side of the cleaning apparatus 100.
  • debris 105 can be scattered either side and an extractor machine will operate in the area between the conveyors 34 and 42 on the drain ditch side of the apparatus 100.
  • the dirty aggregate extractor can be a separate backhoe mechanical digger but alternatively could be an integral part of a cleaning arrangement incorporating the apparatus 100 in accordance with the present invention.
  • an extending arm which will normally be hydraulically operated, will project from the hopper 10 towards a French drain such that dirty aggregate is removed. It will be understood that there may be a crash barrier or other obstacle between the trailer 2 and the French drain such that the provision of an extending arm with other manipulation will allow access to the dirty aggregate of the French drain.
  • the arm will include two rotating helical screws. These helical screws will break into the dirty aggregate to loosen the aggregate stones. In turning the helical screws, the stones are propelled or lifted towards a bucket conveyor of the extraction arrangement.
  • the bucket conveyor will then deliver the dirty aggregate to the hopper 10 for processing as described previously.
  • the hopper 10 In order to enhance performance of the helical screws in propelling and drawing the contaminated and dirty aggregate to the bucket conveyor and then the hopper 10, it is possible to provide a compressed air supply fed through jets at the leading tips of the helical screws in order to loosen conglomeration of the dirty aggregate stones.
  • the cleaned aggregate falls from the rear of the cleaning combination comprising mesh 15.
  • the cleaned aggregate in the aggregate hopper 41 is then fed by the conveyor 42 towards a chute 44 for delivery into the excavated trench or ditch.
  • the chute 44 is after the extraction position, i.e., intermediate chute 42 and debris dispersion, the cleaned aggregate can be returned directly into the trench. Subsequently, the cleaned aggregate will be levelled and compacted as required.
  • the cleaned aggregate conveyor 42 may swivel through an angular range of 180o about a kingpin pivot 40 at the rear of the trailer 2. Thus, the cleaned aggregate is appropriately released back into the top levels of the French drain trench.
  • the exit chute 44 may also be swivelled through an angle of up to 90o for spreading of the cleaned aggregate across the width of the French drain trench.
  • the contaminant debris is presented to the dispersion arrangement including the dispersion disc 36 through a conveyor 34.
  • a debris hopper 33 is provided and the conveyor 34 may swivel about a turn table base 32 (Fig. 1) beneath a hopper 33 in an angular range of 270o in order that there can be appropriate dispersal and scatter of the debris upon an embankment or other acceptable areas adjacent the highway and French drain.
  • a guard 38 is generally provided in order to protect the cleaning apparatus and any workers. This guard 38 may automatically adjust dependent upon the angular position of the base 32 in order to provide the necessary protection to the apparatus, trailer 2, truck 1 and any workers. It will also be understood that the rams 35 allow alteration of the elevation point for scatter by the disc 36 and this will allow alteration of the range and distribution of debris scatter.
  • Fig. 3 illustrates a schematic cross-section along line A-A depicted in Fig. 2.
  • contaminated and dirty aggregate 101 is located in hopper 10 such that the dirty aggregate conveyor 11 can progressively deliver that contaminated aggregate to the cleaning combination including mesh 15.
  • the cleaning apparatus containment skin 20 retains any released contaminant debris for delivery through an aperture 106 to the debris conveyor 30.
  • the cleaning combination including mesh 15 rotates in the direction of arrowhead C, thus in order to facilitate removal of debris a brush 107 may be provided.
  • a number of brush elements 107 will be provided about the mesh 15. Normally, these brush elements 107 will be located on the up-side of the cleaning combination drum rotation direction.
  • Fig. 4 is a schematic cross-section in the direction B-B depicted in Fig. 2.
  • Rotation of the cleaning combination comprising mesh 15 is provided in the direction of arrowhead C with rollers 17 providing location of the cleaning combination.
  • a motor 18 through a chain 19 drives rotation with a tension pulley 22 ensuring efficient power transfer through the chain 19.
  • agitators 21 within the screen 108 there are provided agitators 21. These agitators 21 as depicted principally extend along the length of the cleaning combination comprising mesh 15. In such circumstances, contaminated and dirty aggregate dropped by the feed conveyor 11 upon the mesh 15 is tumbled. The effect of the agitators 21 is to sweep aggregate stones with them during the rotation process upwards until due to gravity those dirty aggregate stones are dropped in a tumbling action as shown by aggregate 101 a downwards within the cleaning combination. By such process, there is shock and abrasion release of debris from the contaminated dirty aggregate. As indicated previously, the released debris falls through the mesh 15 upon conveyor 30 for subsequent dispersal.
  • the cleaning combination of mesh 15 as indicated previously is generally a rotating drum at an inclined angle upwards from the rear of trailer 2.
  • aggregate 101 will be swept and tumbled by the agitators 21 several times before exiting the cleaning combination at the exit end 103 (Figs. 1 and 2).
  • the number of such tumbling actions will depend upon the rate of rotation of the cleaning combination and the angle of the combination. Clearly, higher rates of rotation will bring greater numbers of tumbling actions per unit time whilst a greater angle of inclination for the cleaning combination will generally speed the throughput under gravitational force of the aggregate 101 through the cleaning apparatus 100.
  • the speed with which aggregate must be cleaned is dependent upon the level of contamination, the speed of extraction of dirty aggregate and speed of return of cleaned aggregate to the French drain trench which in turn determines the rate with which a cleaning arrangement in accordance with the present invention can be driven relative to a French drain.
  • the agitators 21 are generally V-shaped and of a solid construction in order to resist the damaging effects of repeated aggregate collisions. However, where possible a displacement mechanism may be provided for each agitator 21 such that the height of that agitator inwardly of the perforated screen can be varied if required. Similarly, the number and distribution of agitators may be varied through removal or retraction into the cleaning combination.
  • Fig. 5 illustrates in schematic cross-section and greater detail a dispersion arrangement 200 in accordance with the present invention.
  • the dispersion disc 36 includes a plurality of radial blades 37 such that as the disc 36 is rotated the debris dropped in the direction of arrowheads D is scattered for easier dispersal by rotation of the disc 36.
  • Rotation of the disc 36 is provided by a motor 39.
  • the scattered debris 105 is distributed by the rotation of the disc 36 but as indicated previously, the elevation and angular position of the dispersion arrangement 200 relative to the cleaning apparatus is determined by a rotation about a turn table base mounting 32.
  • Provision of the dispersion arrangement 200 in accordance with the present invention allows acceptable scatter of the debris rather than separation of the debris into a collector for subsequent disposal in a landfill site.
  • an operator may analyse the released debris from the dirty aggregate 101 and then dependent upon that analysis divert the debris from the dispersion arrangement 200 into a separate collector or holding tank for subsequent disposal.
  • the debris 105 scattered by the dispersion arrangement 200 will be sufficiently finely graded that it will not be readily noticeable upon an embankment adjacent a highway.
  • the method of the present invention involves, as indicated above, using a cleaning arrangement effectively comprising three principal functional components.
  • an extraction mechanism or machine is provided for removal of contaminated and dirty aggregate 101 from a French drain.
  • the extraction machine or components release and feed the dirty aggregate 101 to a hopper 10 as described previously with regard to the cleaning apparatus 100 such that the dirty aggregate 101 is subject to agitation and abrasion release of debris from the dirty aggregate 101.
  • the cleaned aggregate 104 and the debris 105 are separated across the cleaning combination and in particular mesh 15.
  • the cleaned aggregate 104 is returned to the excavated trench whilst the debris 105 is scattered for environmentally acceptable distribution about an embankment or other area adjacent the highway.
  • the cleaned aggregate 104 is then levelled by a compactor machine.
  • the mesh 15 in accordance with the present invention will have a uniform mesh size or interstitial dimension throughout the length of the cleaning combination.
  • a mesh could be provided having a graded size distribution from the feed end 102 to the exit end 103 of the cleaning combination.
  • the mesh could have a random mesh diameter if required.
  • the mesh 15 will generally comprise a number of panels secured about the internal periphery of the drum to allow maintenance, cleaning and change in mesh aperture/interstitial dimension necessary for different sizes of presented aggregate.
  • the cleaning combination including mesh 15 will have a length necessary to provide adequate cleaning of dirty aggregate 101.
  • the cleaning combination will have a length in excess of 3 metres.
  • a French drain will typically only become blocked to a certain depth such that only that depth of contaminated and dirty aggregate will be removed.
  • a French drain will have a width in the range 600 to 1200mm and a contamination depth can be up to 800mm.
  • the chute 44 in accordance with the present invention will generally be provided with an oscillation feature to spread the cleaned aggregate back across the full width of the trench such that a subsequent levelling and compaction machine only has limited requirements for spreading the cleaned aggregate fill into the trench.
  • the extraction machine whether it be an independent backhoe digger or integral component of the present arrangement, will generally require an extension arm or other device to allow dirty aggregate to be removed from the full width of the drain and to the appropriate depth.
  • any type of debris can be removed and aggregate effectively cleaned/screened by the present apparatus and arrangement.
  • the present invention works equally well for single and multiple size aggregate stone with heavy or light levels of contamination and in wet or dry weather.
  • the mesh aperture dimension may be adjusted in situ by adjustment means or different mesh panels assembled into the cleaning apparatus.
  • a number of cleaning combinations may be cascaded in terms of aggregate size so that firstly coarse aggregate is cleaned then finer grades in subsequent cleaning combinations with all cleaned aggregate consolidated in a cleaned aggregate hopper. In such a cascade, the finer grade aggregates would fall through with the debris released from the coarser aggregate which, when cleaned, may pass directly to the hopper.
  • the mesh as indicated previously, may be cleaned by brush elements 107 or through appropriate compressed air-jetting.
  • the rotation speed as well as angular presentation of the cleaning combination substantially determines the effectiveness of aggregate cleaning.
  • a controller which automatically regulates the speed of the apparatus to achieve the most effective cleaning performance.
  • a cleaning combination comprising mesh could have a conical or barrelled shape to facilitate aggregate cleaning as required.
  • Such conical, barrelled or curved waisted configurations may augment the effectiveness of the agitators for agitation and abrasion release of debris from the aggregate.
  • FIGs. 6 and 7 illustrate a further embodiment of the present invention with Fig. 6 representing a schematic side cross section of an apparatus in accordance with this further embodiment wherein a star conveyor 212 is utilised in order to provide preliminary screening of dirty aggregate prior to entry into a cleaning combination 219 whilst Fig. 7 provides a more detailed schematic illustration of the star conveyor 212.
  • a tractor unit 201 pulls a trailer 202 incorporating apparatus in accordance with the present invention with a hydraulic system 203 to provide appropriate manipulation and motivation for the apparatus whilst an outer cover 204 provides protection as well as containment of dust and debris about the apparatus.
  • a hopper 210 is filled with dirty aggregate which is then conveyed by a fuelled conveyor 211 to a star conveyor 212.
  • This star conveyor 212 comprises a number of star wheels upon appropriate axis with flexible fingers of each star wheel inter-engaging such that the aggregate is transported along the star conveyor 212 to the cleaning combination 219 which as described previously comprises a mesh drum.
  • An adjustable ram 213 is provided with respective swing arms 214 for each star wheel. Typically two star wheels were mounted upon the same swing arm 214 with a joining arm 215 between the star wheels. In such circumstances the star conveyor 212 can be appropriately positioned for receipt of dirty aggregate from the conveyor 211 and subsequent presentation to the cleaning combination 219.
  • the cleaning combination is secured upon a chassis 216 and carrier 217 whilst the angle of the cleaning combination is altered by a tilt ram 218.
  • the cleaning combination typically comprises a drum filter mesh 219 such that when the cleaning combination 219 is rotated about a centre spindle 220 upon guide rollers 221, appropriate shock engagement and agitation is provided in order to displace debris from the dirty aggregate.
  • the cleaning combination 219 is driven by a motor 222 through a drive chain 223.
  • debris falls from both the star conveyor 212 and the cleaning combination 219 upon a debris/contaminant extraction conveyor 230 whereby it is delivered to a lift conveyor 231 and subsequently to an overhead conveyor cylindrical base 232 into a hopper 233 from which via an overhead conveyor 234 the debris is presented for scatter.
  • the overhead conveyor 234 is secured to an elevation ram 235 in order to achieve the desired inclination for appropriate presentation of the debris.
  • the debris passes through a channel 236 with a hinge plate 237 and a roller plate 238 in order to appropriately pivot about a slider/pivot 239 for delivery of the debris.
  • a distribution disc 240 is driven by a motor 241 whereby removed debris from the dirty aggregate can be widely dispersed along an embankment and beside a road rather than necessitating delivery to a landfill site.
  • Cleaned aggregate exits the cleaning combination 219 into a hopper 251.
  • An aggregate distribution conveyor 252 is mounted upon an aggregate conveyor swivel 250 with a ram 253 arranged to determine conveyor 252 attitude.
  • the cleaned aggregate passes through a shute 254 for distribution into a French drain.
  • a digger arm will either be incorporated into the trailer 202 or a separate excavator utilised in order to remove dirty aggregate to a required depth from the French drain for deposit in the hopper 210.
  • a star conveyor 212 comprises a number of star wheels with inter engaging flexible teeth or fingers which promote transfer of the aggregate particles towards the cleaning combination 219.
  • Alternative axles of each star 215 are mounted on swing arms 214 adjustable in the vertical plain. In such circumstances, clearance aperture between each star wheel axle may be increased using a ram 213 or screw device to move the joining arm 215 forward and aft so lowering the alternate star axles. With variations in the clearance it will be understood that different sizes of debris particles may then fall through upon the conveyor 230 for appropriate collection or dispersion.
  • Each individual star wheel is independently powered and their speeds synchronised for appropriate pre-screening for removal of debris from dirty aggregate.
  • the feed conveyor 211 is controlled and synchronised such that the volume of dirty aggregate presented does not exceed that of the star conveyor capacity.
  • Fig. 7 a schematic part cross-section showing greater detail of the star conveyor 212.
  • the ram 213 acts through a control bar and swing arms 214 in order to move the star wheels appropriately to adjust the gap between adjacent wheels for differing expected sizes of displaced debris from the aggregate initially presented from the feed conveyor 211 and subsequently presented to the cleaning combination 219 in the form of a mesh drum.
  • the star conveyor 212 is typically slightly inclined with rotation of each individual star wheel designed to facilitate movement in the direction of arrowhead Z towards that cleaning combination 219.
  • the star wheels have flexible teeth in order that the aggregate is agitated for removal of debris rather than ground by these teeth on the star wheels of the conveyor 212.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Processing Of Solid Wastes (AREA)
EP03255221A 2002-08-22 2003-08-22 Nettoyage d'agrégats Withdrawn EP1391251A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0219594A GB2393638B (en) 2002-08-22 2002-08-22 Aggregate cleaning
GB0219594 2002-08-22

Publications (2)

Publication Number Publication Date
EP1391251A2 true EP1391251A2 (fr) 2004-02-25
EP1391251A3 EP1391251A3 (fr) 2005-11-09

Family

ID=9942802

Family Applications (1)

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EP03255221A Withdrawn EP1391251A3 (fr) 2002-08-22 2003-08-22 Nettoyage d'agrégats

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Country Link
EP (1) EP1391251A3 (fr)
GB (1) GB2393638B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141626A3 (fr) * 2008-05-23 2010-11-04 Ballard Tobias B Appareil
ITUB20155871A1 (it) * 2015-11-25 2017-05-25 Azienda Agricola Il Vallone Soc Agricola Macchina e metodo per vagliare un materiale sfuso
AU2015252025B2 (en) * 2014-11-11 2019-10-24 Ausroad Holdings Pty Ltd Vehicles
CN114082648A (zh) * 2021-11-18 2022-02-25 湖南翱康生物科技有限公司 一种中药材初加工用晾晒除杂装置
GB2601169A (en) * 2020-11-20 2022-05-25 Crown Plus Ltd Filter drain cleaning systems
EP4059623A1 (fr) * 2021-03-15 2022-09-21 Portafill International Limited Appareil de criblage de combinaison
US11865582B2 (en) 2021-03-15 2024-01-09 Portafill International Limited Combination screening apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0324834D0 (en) * 2003-10-24 2003-11-26 Taylor Robert Recycling filter system

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DE8906721U1 (fr) * 1989-06-01 1989-07-13 Turba Torfindustrie Gmbh, 2862 Worpswede, De
JPH01293171A (ja) * 1988-05-18 1989-11-27 Yanmar Agricult Equip Co Ltd 穀粒選別装置
WO1992006250A1 (fr) * 1990-10-04 1992-04-16 Highway Care Limited Ameliorations concernant le nettoyage d'agregats
US5437374A (en) * 1993-07-23 1995-08-01 Osborn Engineering, Inc. Adjustable orifice trommel
US5819950A (en) * 1996-04-05 1998-10-13 Mccloskey; James Paschal Portable trommel
US20020056668A1 (en) * 2000-10-27 2002-05-16 Jean-Denis Dube Mobile screening unit

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AT373316B (de) * 1982-03-10 1984-01-10 Plasser Bahnbaumasch Franz Fahrbare anlage zum aufnehmen und reinigen des schotters von gleisen
AT378385B (de) * 1983-11-04 1985-07-25 Plasser Bahnbaumasch Franz Gleisbaumaschine mit siebanlage
IT1181235B (it) * 1984-11-23 1987-09-23 Danieli Off Mecc Risanatrice per massicciata con vaglio continuo a trasportatore senza fine

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JPH01293171A (ja) * 1988-05-18 1989-11-27 Yanmar Agricult Equip Co Ltd 穀粒選別装置
DE8906721U1 (fr) * 1989-06-01 1989-07-13 Turba Torfindustrie Gmbh, 2862 Worpswede, De
WO1992006250A1 (fr) * 1990-10-04 1992-04-16 Highway Care Limited Ameliorations concernant le nettoyage d'agregats
US5437374A (en) * 1993-07-23 1995-08-01 Osborn Engineering, Inc. Adjustable orifice trommel
US5819950A (en) * 1996-04-05 1998-10-13 Mccloskey; James Paschal Portable trommel
US20020056668A1 (en) * 2000-10-27 2002-05-16 Jean-Denis Dube Mobile screening unit

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PATENT ABSTRACTS OF JAPAN vol. 014, no. 074 (C-0687), 13 February 1990 (1990-02-13) & JP 01 293171 A (YANMAR AGRICULT EQUIP CO LTD), 27 November 1989 (1989-11-27) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141626A3 (fr) * 2008-05-23 2010-11-04 Ballard Tobias B Appareil
AU2015252025B2 (en) * 2014-11-11 2019-10-24 Ausroad Holdings Pty Ltd Vehicles
ITUB20155871A1 (it) * 2015-11-25 2017-05-25 Azienda Agricola Il Vallone Soc Agricola Macchina e metodo per vagliare un materiale sfuso
GB2601169A (en) * 2020-11-20 2022-05-25 Crown Plus Ltd Filter drain cleaning systems
EP4059623A1 (fr) * 2021-03-15 2022-09-21 Portafill International Limited Appareil de criblage de combinaison
US11865582B2 (en) 2021-03-15 2024-01-09 Portafill International Limited Combination screening apparatus
CN114082648A (zh) * 2021-11-18 2022-02-25 湖南翱康生物科技有限公司 一种中药材初加工用晾晒除杂装置

Also Published As

Publication number Publication date
GB0219594D0 (en) 2002-10-02
GB2393638A (en) 2004-04-07
EP1391251A3 (fr) 2005-11-09
GB2393638B (en) 2006-04-12

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