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WO2008035990A9 - Appareil de tamisage - Google Patents

Appareil de tamisage Download PDF

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Publication number
WO2008035990A9
WO2008035990A9 PCT/NZ2007/000272 NZ2007000272W WO2008035990A9 WO 2008035990 A9 WO2008035990 A9 WO 2008035990A9 NZ 2007000272 W NZ2007000272 W NZ 2007000272W WO 2008035990 A9 WO2008035990 A9 WO 2008035990A9
Authority
WO
WIPO (PCT)
Prior art keywords
carriage
screen
drive shaft
tines
assembly
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/NZ2007/000272
Other languages
English (en)
Other versions
WO2008035990A2 (fr
WO2008035990A3 (fr
Inventor
George Burgess
Brian Burgess
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.)
POWER GLIDES SCREENS Ltd
Original Assignee
POWER GLIDES SCREENS 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 POWER GLIDES SCREENS Ltd filed Critical POWER GLIDES SCREENS Ltd
Publication of WO2008035990A2 publication Critical patent/WO2008035990A2/fr
Publication of WO2008035990A3 publication Critical patent/WO2008035990A3/fr
Anticipated expiration legal-status Critical
Publication of WO2008035990A9 publication Critical patent/WO2008035990A9/fr
Ceased legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/445—Bar screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
    • 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
    • E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
    • E02B8/023—Arresting devices for waterborne materials
    • E02B8/026—Cleaning devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Definitions

  • the invention relates to a screening apparatus for removing unwanted material from a fluid flow.
  • the invention is directed particularly but not solely towards a screening apparatus for removing solid impurities from wastewater flow
  • Known screening apparatus are used to remove unwanted materials from a fluid flow.
  • Such apparatus or devices are large and unwieldy with complicated components that require intensive maintenance, are unreliable and are both expensive to purchase and maintain.
  • the invention resides in a screening apparatus for removing unwanted material from a fluid flow, that includes a screen having a length and longitudinal slots therein and a rake assembly operatively positioned along the screen by a carriage at a set distance therefrom, the rake assembly being displaceable along the screen by at least one driving means, the rake assembly including a plurality of tines movably connected to a rake arm and displacement means to move at least one tine with respect to the rake arm to cause movement of all the tines, between an inoperative position as the rake assembly moves to one end of the screen and an operative position as the rake moves to the other end of the screen such that any solids or unwanted materials caught by or located on the screen or flow are removed from the screen or moved along the screen, displacement means comprise a mechanical linkage acting between each rake assembly and the screen or apparatus dependent from the screen, the actuator comprises at least one hydraulic ram or drive shaft wherein the rake assembly is fixedly mounted on the drive shaft by a slot
  • the T-bar assembly includes at least one fan shaped member having at one end a bar in a manner to form a T-bar and the fan shaped member having one end slidably held within the slot of the block to form the T-bar assembly and the other end rotationally mounted to a transversely mounted shaft which such shaft is supported by the carriage whereby movement initiated by the drive shaft can cause movement of the bar of the T-bar assembly about an offset rotational point as provided by the square transverse shaft to the T- bar to cause the movement of the square shaft and all of the tines of the rake assembly.
  • the transverse shaft also has further tines mounted thereon.
  • the drive shaft has at least an upper and lower push or pull plate mounted thereon which such shaft is also mounted to the carriage and frame whereby movement of the drive shaft between fixed positions with the lower push plate being between a lower T-bar assembly and a lower drive shaft bearing supports on the carriage can cause movement of the rake assembly and carriage at sequenced consecutive positions on the frame when the carriage travels down the screen with a first shaft movement retracting the tines and then the carriage moves, and the upper push plate being located between an upper carriage drive shaft bearing and a middle carriage drive shaft bearing which in use extends the tines and then pushes the carriage up the screen, whereby one movement being the movement of the rake assembly and the following movement then being the movement of the carriage along the screen until it hits the end of the frame.
  • the screen slots are shaped to cause a pressure differential from above to below thereby causing a general drawing of fluid down and through the screen.
  • the carriage is slidably mounted on the drive shaft and frame by carriage bearing assemblies.
  • tines are connected to the transverse shaft which shaft is rotatably connected to the drive shaft and to the carriage which carriage is slidably connected to the drive shaft, whereby movement of the drive shaft in the opposite direction after the carriage is stopped causes the tines to be extended or retracted and further movement of the drive shaft causes the carriage and tines to move up or down the screen.
  • tines are connected to the transverse shaft which is rotatably connected to the drive shaft and to the carriage which is slidably connected to the drive shaft whereby movement of the drive shaft after the carriage is stopped in the same direction causes the tines to be extended or retracted and further movement of the drive shaft can cause the carriage and tines to move up or down the screen.
  • the invention comprises a method of raking a screen with a screening assembly for removing unwanted material from a fluid flow which includes a screen having a length and longitudinal slots therein and a rake assembly operatively positioned along the screen by a carriage at a set distance therefrom, the rake assembly being displaceable along the screen by at least one driving means, the rake assembly including at least one tine movably connected to a rake arm and displacement means to move the said at least one tine with respect to the rake arm, between an inoperative position as tihe rake moves to one end of the screen and an operative position as the rake moves to the other end of the screen such that any solids or unwanted materials caught by or located on the screen or flow are removed thereon/therefrom, displacement means comprise a mechanical linkage acting between each rake assembly and the screen or apparatus dependent from the screen, the actuator comprises at least one hydraulic ram or drive shaft including an upper and lower push plates which can move between carriage bearings wherein the rake assembly is fixed
  • Figures IA to 1C are diagrammatic side elevations illustrating the raking cycle of the raking assembly of the present invention with the rakes extending from underneath the screen
  • Figure 2 is a plan view of screen apparatus with the rakes extending from above the screen
  • FIG. 3 is a side view of the screening apparatus of Figure 2
  • Figure 4 is an end view of the screening apparatus of Figure 2
  • Figure 5 is an upper close up perspective view of the apparatus of Figures 2-4
  • Figure 6 is an end cross sectional view of the apparatus showing the frame and screens
  • Figure 7 is another end view but showing the carriage
  • FIG. 8 is a close up side view of the T-bar assembly and push plates
  • Figure 9 is an upper perspective view of the apparatus with the drive shaft located underneath the frame
  • Figure 10 is a close up view of a portion of the apparatus of figure 9
  • Figure 11 is a schematic representation of the screening apparatus in a simple form
  • the tines of the rake assembly can extend from above or from below the screen.
  • Figures 1 A-IC and 5-10 show the tines extending from below while figures 2-4 show the tines extending from above the screen. Any such configuration is possible.
  • FIG. IA to 1C Operation of a screening apparatus according to the invention is shown diagrammatically in Figures IA to 1C the rake assembly being operatively located underneath the screen.
  • a screen 1 having screen elements 2 is shown in side elevation having a first end (or in use a lower end) being the entry end of the screen and a second end (or in use the upper end) being the discharge end.
  • screen 1 may also be viewed in Figures IA to 1C as being plan views if the screen is arranged horizontally rather than vertically.
  • individual screen elements 2 can be disposed vertically and spaced horizontally but can also be disposed horizontally and spaced vertically.
  • the screening system according to the invention can be used with the screen elements arranged in a vertical or horizontal disposition, or possibly one or more intermediate dispositions.
  • the screen elements 2 have gaps or slots between adjacent elements.
  • the gaps can be formed by the individual screen elements 2 simply comprising bars or the screen could be manufactured in another manner, for example having slots cut out of a sheet material, or could alternatively be moulded or cast.
  • the screen is constructed from steel, but those skilled in the art will appreciate that other materials could be used, for example suitable plastics materials.
  • the screen slots and elements are shaped such that in when fluid enters from above the screen at any angle, to exit below or through the screen there is created a pressure differential from entry to exit thereby causing a general sucking or forcing of fluid flow through and past the screen elements.
  • Screen 1 is sized and operates by allowing liquid which includes water and solids to allow the. fluid to pass through the slots in between the screen elements, but impeding suspended solids. Therefore, the spacing between adjacent screen elements 2 is selected so as to provide an appropriate degree of filtering. Accordingly, only suspended solids which have a dimension which is greater than the gap between adjacent screen elements will be trapped on the screen.
  • screenings It is desirable to remove solids that have collected on the screen (referred to generally in this document as “screenings”) in order to allow the screen to function properly. If the solids are not regularly removed from the screen, then the passage of liquid through the screen is impeded.
  • the screen face is best oriented at angle to any fluid flow to enable a general screening of unwanted debris to occur.
  • any orientation for the screen 1 is also possible.
  • the screen 1 is placed in a channel such as a, water, sewerage or treatment channel.
  • screen 1 may also be placed across an exit from a pool or other reservoir, such as the intake for a hydroelectric power station for example or be located in a vertical flow.
  • the rake assemblies for the present invention can be provided at the underneath or rear of the screen, or on top of/above the screen and the tines of each rake assembly may be arranged to project through the slots in the screen between the screen elements.
  • the rake assemblies for the present invention may be suspended above a front surface of the screen and be extended to move the screening up the screen and also be retracted by moving rake(s) away from the front surface of the screen.
  • rake assembly is generally referenced as 4 is shown including rake tines or teeth 8 in the extended operable position with the tines 8 projecting through slots in the screen 1. In this position, the tines 8 interdigitate with the screen elements 2.
  • Rake assembly 4 is mounted on a sub-assembly which includes a carriage 10 which is slidably supported by a frame 20.
  • Carriage 10 is capable of being moved relative to the screen 1 in a direction substantially parallel to the screen 1. Therefore, if the carriage 10 is moved from the position shown in Figure IA from the first end of the screen, up the screen in a direction shown by arrow 12 then the solids 14 will be collected and or pushed by the tines 8 of rake assembly 4.
  • the result of movement in the direction shown by arrow 12 is illustrated in Figure IB where the screenings that were collected by rake assembly 4 have been moved by that rake assembly off the top end or second end of the screen 1.
  • a bin (not shown) or similar disposal area is provided at or below the top end of the screen 1 so that screenings which have been collected by rake assembly 4 may and 5-10 be disposed of.
  • the next step in the screening process is retraction of the tine(s) 8 of rakes assembly 4 which can be referred to as the inoperative position.
  • This is shown in Figure 1C.
  • the tine(s) 8 have been moved to a retracted inoperable position where they are disposed in such a way that they do not interfere with the screenings 16, or any other solid matter (not shown) which may be deposited on the screen while the retraction operation occurs.
  • Figure 1C shows that and freshly collected screenings 16 remain in position on the screen. This occurs because the angle of the screen is such that screenings do not tend to fall down the screen.
  • the flow of liquid through the screen as represented by arrow 3, maintains a force against the screenings which maintains the screenings in place on the screen.
  • the next step is to extend the tines 8 of the rake assembly 4 so that they assume the orientation shown in Figure IA. In this orientation, the screenings 16 will be collected by the tines of rake assembly 4 ready for removal from the screen by being pushed off the screen 1.
  • each rake assembly 4 can be moved in a single operation a distance which is at least equal to the length of the screen 1 on which the rake 4 operates from the first end to the second end without any staged removal being necessary.
  • the apparatus can also be operated in a staged removal system whereby any debris is moved up the screen in stages by successive waves of rake assemblies travelling a portion of the screen length.
  • carriage and screen assemblies may be mounted, depending upon the overall size of the screen and the distance over which the actuation device that moves the carriage 10 is capable of extending. More rakes assemblies can be provided on a single carriage or further carriages can be designed to be attached to an existing carriage with one or more rakes. Also, carriages can be provided across parts of the screen in a side by side relationship. Thus carriages may be operated in unison across a screen, or could be operated independently across a screen.
  • FIG. 2 the rake assembly 4 is shown operatively supported above the screen 1 though it is equally possible to have the rake assembly below the screen.
  • Figure 2 a partial side elevation of a screening system is shown.
  • the reference numerals used in Figures IA to 1C are used in the remaining drawings to illustrate features which are similar or the same.
  • the screening system of Figure 2 is supported on a frame 20 to which the screening elements
  • the screening elements 2 are connected. As shown in figure 4 there is a space between the lower part or rear part of the frame 20 and the screening elements. It is in this space that carriage 10 is provided or located. In another example in a vertically disposed screen, the screening elements 2 are provided down the front face of the assembly and are mounted and fastened at the top and bottom of the frame. The screening elements can be post-tensioned.
  • Each carriage 10 shown can have at least one rake assembly 4 mounted thereon per screen. In another option there can be several carriages 10 each supporting at least one rake assembly 4 per screen but all coordinated or not as required.
  • the carriage 10 includes a carriage frame 21 slidably supported by frame 20.
  • Each rake assembly 4 includes at least one tine 8 movably supported by a transverse shaft 22.
  • Transverse shaft 22 spans across the width of screen 1 and is spaced from one side of the screen elements 2 to the other and said shaft 22 is connected to at least one fan-shaped arm 22a which inturn is located in a bearing assembly 23 or block which itself is operatively connected to longitudinal extending shaft 24.
  • Shaft 24 can be located above or below the screen and is operatively supported by the frame 20 and is connected to the carriage 10 without obstructing the sliding movement of the carriage on the frame.
  • shaft 22 is shown as being above the screen element even though other orientations spacing such as being above the screen is or are equally possible.
  • shaft 22 is has a square cross section and is end supported by slidable bearings 23 at each side of the screen on the frame 20.
  • tines 8 movably connected to a common transverse shaft 22. At least one tine 8 is connectively and movably supported to drive shaft 24 by a driving block 25. This is shown in figures 8 and 9.
  • Block 25 is fixedly connected to drive shaft 24 with a push pull bracket 26 whereby movement in the longitudinal direction i.e. along the length of the screen or parallel to the flow of liquid 3, by the drive shaft 24 causes the block 25 to longitudinally move thereby causing the square shaft 22 to rotate and move all tines in the same rotational direction from either retracted or extended position.
  • the actuator or means that initiates movement of the tines begins with the movement of the shaft 24.
  • Shaft 24 is supported by several bearing supports to the carriage and frame with at least one spacer inbetween.
  • the spacer can merely be a ringed member fixedly adjustably attachable to the shaft 24.
  • the driver block 25 is fixed to the drive shaft which in turn is slotted with a bearing assembly to rotatably house a T-bar member.
  • the T-bar member is operationally joined to the rake assembly by the transverse shaft 22.
  • the T-bar member and slotted block form a T-bar assembly.
  • the driving block 25 is slotted and can be orientated differently depending on whether the drive shaft 24 is mounted on top of the screen or below it. If mounted above . (see figures 2-4) then the slotted block with its opening facing downwards has a stopping portion to keep the T-bar member from falling out. If mounted below then the opening can face upwards without any stopping portion being required.
  • Drive shaft 24 is operatively connected to an assembly can also have several push/pull plates 27 and 27a, support bearings 31 connected to the carriage/frame and push pull brackets 28 whereby movement of the drive shaft 24 via any operating means such as hydraulics, causes the longitudinal movement needed via the push/pull plates to move the rake assembly 4 as described and also move the carriage 10 after the rake assembly has been moved.
  • Drive shaft 24 can be moved directly with or without an Outer receiving tubular shaft portion.
  • At least one tine per rake assembly 4 has the driving block 25 which is connected to one end of a tine via another transverse shaft 22b and as the tine is also rotatably connected to square shaft 22 movement by the drive shaft 24 only allows the tines to rotate about the square shaft 22 thereby allowing the tines to move from an inoperative position to an operative position (or from a retracted position to a retracted position) and visa- versa.
  • transverse shaft 22 has several tines 8 fixedly affixed either directly as shown in figure 5 or indirectly to shaft 22 by at least one T-bar assembly.
  • This T- bar assembly is shown in figures 5-10 which such T-bar assembly comprises at least one fan.
  • shaped member 22a to a block 25 via a movable bearing assembly.
  • the movable bearing assembly comprises a vertically oriented aperture or slot 25a in a substantially rectangular shape having a slidable bearing surface within for short the shaft 22b.
  • Fan-shaped member 22a comprises an elongate planar member with one end being connected to square shaft 22 via a square aperture and at the other end to short shaft 22b.
  • Short shaft 22b comprises a rotatable member which can be in this example a rod member connected transversely to the planar member to form the T-bar assembly where by in use the rod member is able to move vertically within the aperture when shaft 24 is moved.
  • the T-bar assembly acts in use as the actuator for initiating movement of all the tines of the rake assemblies, as the rest of the tines are also connected to the same square transverse shaft 22.
  • the tines which are directly connected to the shaft 22 do not have a separate fan shaped member at one end but are just formed with an aperture to accept the shaft 22 directly therethrough.
  • the aperture of the driving block 25 which can be U-shaped needs to have a stop portion to not allow the rake assembly to drop out but still move within.
  • the aperture need only be U shaped.
  • push plate 27 is affixed to drive shaft 24 at a suitable position with respect to the start end of screen 2.
  • Another push plate 27a is also fixed to shaft 24 at a suitable distance X from the first push plate which can for example comprise a first ring portion being larger than a second co-joined ring portion.
  • the distance X is determined by the degree of rotation required in the tines in light of its rotational connection to the square shaft 22 and to the drive shaft 24.
  • FIG 5 there is a close up perspective view of the rake assembly being above the carriage 10 and screen 1.
  • the tines 8 there are two positions for the tines 8 being shown in that the solid lines represent or show the tines being in an extended or operative position while dotted lines show the tines 8 in a retracted or inoperative position.
  • a push plate 27 is shown which is fixedly attached to shaft 24 and spaced a certain amount from the bearing supports of the shaft to carriage. This positioning of the tines can be adjusted depending on what is required or is necessary.
  • Figures 6-10 show the carriage and rake assembly 4 being positioned underneath the screen 1. This variation in positioned uses the same apparatus as for the above position as shown in figures 1-5 except that the block 25 does not need to have a stopping means to hold the T- assembly in place or stop if from falling out.
  • Other variations include the use of spacers in combination with the push pull plates 27 as fixed on drive shaft 24.
  • FIG 6 the structure of the frame 20 with part of the carriage and rake assembly is shown.
  • the tines 8 are shown as being in an operative position while in figure 7 this cross section shows more of the carriage 10 with the tines being retracted.
  • Figure 8 shows the tines in two sequences with one tine for example being shown, whereby the tine orientation on the left shows a retracted or inoperative position, while the right hand portion _ ⁇ _
  • FIG. 9 shows one tine extended or in operation
  • figures 9 and 10 show the rake assembly with the T-bar assembly being clearly shown in a 'revealed portion' whereby movement by the drive shaft or output shaft 24 which can or not have an outer ram portion 26,(see Figure 7 which shows ram 26) through the push plates between stops pushes/moves at least one T-bar assembly which by virtue of the offset rotation as provided by connection to the square shaft 22, moves the other linked tines of the rake assembly 4 from a retracted to extended positions (or vice versa) as well.
  • the dotted lines show the tines in a retracted position (or non operating position) while the solid lines for the tine indicates an extended or operating position.
  • the steps of operation using an upper and lower push or pull plate movable between carriage bearings can be:
  • the hydraulic drive shaft 24 includes at one end to an ' output shaft 24 of a ram such as a pneumatic or hydraulic ram.
  • the shaft 24 is also connected to carriage 10 by a pin.
  • a ram such as a pneumatic or hydraulic ram.
  • the shaft 24 is also connected to carriage 10 by a pin.
  • actuation is hydraulic, but a pneumatic power source may also be used, as may a worm device or a rack and pinion arrangement. Hydraulic actuation has the advantages of simplicity, reliability and the ability to exert a considerable force which may be required in large installations.
  • FIG. 11 In another variation of the screening apparatus of the previous assembly can be simplified by having a single carriage slidably on top of the frame but with say two rake assemblies being movably fixed to the carriage.
  • FIG. 11 This is a mainly plan view but with the end part of frame 10 being shown protruding upwards to show that the frame has an upper portion above carriage to support the drive shaft 24 which is also above and rotatably support the carriage.
  • This uses the principles of the tine movement as previously disclosed but only uses one push plate which can move between bearing supports but still uses the drive shaft to cause consecutive movement of the tine ' s followed by the carriage which such tine movement is initiated by a central actuator using a T-bar assembly.
  • the carriage 20 can have say for example a lower frame 2OA made up of two main transverse members and longitudinal member supported by the frame 10 by slidable end bearings 23 and further upwards the carriage includes an upper frame 2OB comprising three transverse supports all interconnected to form rectangular frames.
  • the carriage drive shaft bearings 31 ie an upper 3 IA, middle 3 IB and lower one 31C.
  • an upper T-bar assembly 25 D which is located upwards and beyond the upper carriage bearings 31 and lower T-bar assembly located between the middle bearings and lower bearings 31.
  • Lower push plate 27B is located between the lower bearing and lower T-bar assembly.
  • the upper rake assembly 4A is attached to the front of the rear transverse frame member and the other rake assembly 4B can be attached to the very front carriage transverse member and also being in front thereof.
  • the carriage 20 is also slidably support and or connected to the drive shaft 24 as centrally located thereon. At each point on the shaft where the rake assembly is located, there is ' an actuator or T-bar assembly.
  • T-bar assembly 25D there are sliding bearing supports on the upper frame with a fixed stop or push/pull plate 27 on shaft 24 (as shown roughly in the middle) so that the shaft 24 only can move from the stop to the end of the frame which then actuates the T-bar assembly 25D and then is followed by the whole carriage 20 moving with tines 8 extended or retracted as required.
  • the T-bar assembly can be fo ⁇ ned as having the short bar joined to a fan shaped member or web member whereby the web member can be fixedly attached to a transverse top cover member which then has all the tines extending therefrom with or without the transverse square cross sectional shaft.
  • the carriage 20 is prevented by going any further by the end stopes provided by the frame 10 which also includes an upper portion which can also support the drive shaft.
  • the drive shaft then moves upwards to cause the first movement of the tines to an extended position until it hits the upper carriage drive shaft bearings which then means the upper push plate 27A pushes the carriage and tines up the screen to move any debris thereon.
  • the drive shaft 24 then stops and then changes direction to move downwards. This first movement pushes the lower push plate 27B to retract the tines and then when the lower push plate hits the lower carriage member it then pushes the carriage back down the screen with the tines up or retracted.
  • the screen of the screen apparatus can also have a separate trans verse bar with fins 22D (see figure 11) there-attached which can protrude upwardly without blocking the movement of the tines 8 or rake assemblies through and past the screen elements.
  • the rake assemblies can push any unwanted debris on the screens up or along the screen until they reach the fins which then in use hold or present the debris from sliding backwards.
  • These fins include a planar structure similar in dimensions to the tines having rounded edges and can also be provided at any position of and on the screen as required like for example to be directly fixed to the top of each screen element in any desired spacing.
  • a roller can be provided mounted on carriage 10 and in use contacts the rear or lower edges of the screen elements 2. Therefore, the carriage 10 is mounted within frame 20 and screen 1 by being supported at its lower edges on rails and being guided and supported relative to the screen at its upper extremity by roller.
  • each tine 8 is shown as having an arm portion with a distal end having a hook portion.
  • Proximal end of tine arm is joined to driving block 25 via moving rod portion which is captured within a recess portion of block 25.
  • At a set distance along the tine arm there is a rotating portion whereby shaft 22 is connected such that translational movement of driving block 25 causes rotation of the shaft 22 and in turn all tines connected thereto.
  • carriages may be provided side by side or underneath each other and linked together for example. Also, a number, for example three, carriages could be provided, each with its own driveshaft 24 and ram 26 to operate various sections of the screen independently or together as required or sequentially.
  • Screen elements can be provided in different forms, shapes and sizes depending upon the application for which they are required.
  • the screen elements are provided as an arm or web which has an end thereon that is exposed to the incoming fluid or water flow.
  • the web can be typically 50-75mm deep and lies substantially parallel to the liquid flow path.
  • the width of the front face of the elements that is exposed to the flow path is approximately 10-30mm depending upon the application.
  • Screen elements may be made of various materials. The most desirable is stainless steel, but plastics materials, GRP, aluminium, or mild steel which has been suitable treated, for example by a galvanic process, may also be used.
  • the tines are rotatably connected to a central block 25 via a transverse shaft which is end supported by the carriage which block 25 is removably fixed to drive shaft 24 and is located as shown in figure 3 on one side of one of the push plates.
  • the carriage is slidably connected to drive shaft 24 between the two push plates and is also slidably end supported on the screen frame.
  • This invention may also broadly be said to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, and any or all combinations of any two or more of the parts, elements or features, and where specific integers are mentioned herein which have known equivalents such equivalents are deemed to be incorporated herein as if individually set forth.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un ensemble de tamis servant à retirer une matière non désirée à partir d'un écoulement de fluide, comprenant un ensemble de râteau monté sur un chariot coulissant monté et espacé d'un tamis par l'intermédiaire d'un cadre. L'ensemble de râteau comprend des dents montées sur un arbre par un ensemble de barre en T qui, lors de l'utilisation, peut déplacer les dents d'une position rétractée ou non fonctionnelle à une position étendue et inversement. Un arbre d'entraînement monté sur le chariot et le cadre est relié de façon fonctionnelle à l'ensemble de râteau, ce par quoi le mouvement de l'arbre d'entraînement amène l'ensemble de barre en T à placer les dents dans une position étendue ou une position non étendue, un tel mouvement des dents étant ensuite suivi par un déplacement du chariot avec les dents pour pousser ou retirer toutes matières prises sur le tamis, hors du tamis ou le long du tamis.
PCT/NZ2007/000272 2006-09-19 2007-09-19 Appareil de tamisage Ceased WO2008035990A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ549964 2006-09-19
NZ54996406 2006-09-19

Publications (3)

Publication Number Publication Date
WO2008035990A2 WO2008035990A2 (fr) 2008-03-27
WO2008035990A3 WO2008035990A3 (fr) 2008-07-10
WO2008035990A9 true WO2008035990A9 (fr) 2009-07-09

Family

ID=39200991

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2007/000272 Ceased WO2008035990A2 (fr) 2006-09-19 2007-09-19 Appareil de tamisage

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WO (1) WO2008035990A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102366744A (zh) * 2011-04-13 2012-03-07 中国石油化工集团公司 杂物分离装置
GB2556085B (en) * 2016-11-18 2020-05-06 Bp Mckeefry Screening apparatus
CN107413635B (zh) * 2017-09-30 2023-12-22 大唐巩义发电有限责任公司 一种振动平煤篦
CN112893087A (zh) * 2021-01-14 2021-06-04 拉萨纳龙建筑材料有限公司 一种用于混凝土生产用多粒径石子筛选装置及方法
CN114535060A (zh) * 2022-01-11 2022-05-27 桂林芯隆科技有限公司 一种芯片晶粒挑选装置
CN116078674B (zh) * 2023-02-09 2023-09-26 惠州市华盛源机电有限公司 一种散热器检测设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1513739A (en) * 1975-09-29 1978-06-07 North West Water Authority Screening apparatus for sewage
US4792394A (en) * 1985-10-04 1988-12-20 Rudz Enterprises, Inc. Bar screening apparatus
US5032263A (en) * 1989-12-14 1991-07-16 Rudz Enterprises, Inc. Bar screen and rake apparatus
US6010013A (en) * 1997-02-03 2000-01-04 Meurer Industries, Inc. Universal method of and apparatus for screening debris
NZ513379A (en) * 2001-08-07 2004-03-26 Power Glides Screens Ltd Suspension screen raking system (NO.2)
NZ513378A (en) * 2001-08-07 2004-03-26 Power Glides Screens Ltd Suspension screen raking system with spaced longitudinal rakes reciprocating for reduced ltravel

Also Published As

Publication number Publication date
WO2008035990A2 (fr) 2008-03-27
WO2008035990A3 (fr) 2008-07-10

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