SE539804C2 - Drum filter apparatus with fastening arrangement for the filter plates - Google Patents
Drum filter apparatus with fastening arrangement for the filter plates Download PDFInfo
- Publication number
- SE539804C2 SE539804C2 SE1551541A SE1551541A SE539804C2 SE 539804 C2 SE539804 C2 SE 539804C2 SE 1551541 A SE1551541 A SE 1551541A SE 1551541 A SE1551541 A SE 1551541A SE 539804 C2 SE539804 C2 SE 539804C2
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- SE
- Sweden
- Prior art keywords
- fastening
- drum
- recess
- fastening member
- fiiter
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
- B01D33/09—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration with surface cells independently connected to pressure distributors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/40—Special measures for connecting different parts of the filter
- B01D2201/4084—Snap or Seeger ring connecting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Treatment Of Fiber Materials (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
ABSTRACT The apparatus (10) oomprises a cyiindricai drum (26)) supported witha rim structure (21, 22) on e shaft (25). An outer surface of the drum (26) com-prises a number of fiiter piates (23) forming a oyiindricai fiiter surface. Eachfiiter piate (23) is attached through at ieast three fastening points (P1, P2, P3)to the rim structure (21, 22). A first recess (46) extends into the fiiter piate (23)and a fasteriing fiange (116) is positioned at Beast partiy in the first recess (46).A iongitudinai fastening member (12Q) is attached from a first end portion (121)to the fastening fienge (110) and from a second end portion (122) to the rimstructure (21, 22). At ieast one snap iocking means (140) is positioned in thefastening fiange (119) or in the rim structure (21, 22) or in both. The fiiter piate(23) is mounted on the drum (20) hy pressing the fiiter piate (23) radiaiiy to thedrum (ZS) so that the snao iocking means (140) iocks the fiiter piate (23) to therim structure (21, 22) of the drum (29). The outer surface of the fiiter oiate (23)wiii he unhroken, which ieads to a bigger effective fiiter area in the fiiter piate(23). (Figures 2 and 7)
Description
The present invention relates to a drum filter apparatus according tothe preamble of claim 1.
BACKGROUND OF THE INVENTION Filtration is a widely used process whereby a slurry or solid liquidmixture is forced through a media, with the so|ids retained on the media andthe liquid phase passing through. Examples of filtration types include depthfiltration, pressure and vacuum filtration, and gravity and centrifugal filtration.
Both pressure and vacuum filters are used in the dewatering ofmineral concentrates. Pressure filtration is based on the generation of anoverpressure within a filtration chamber. Consequently, so|ids are depositedonto the surface of the filter medium and filtrate flows through the filter mediuminto the filtrate channels. Pressure filters often operate in batch mode becausecontinuous cake discharge is more difficult to achieve.
Vacuum filtration is based on producing a suction within the filtratechannels and thereby forming a cake of mineral on the surface of the filtermedium. The most commonly used filter types in vacuum filters are filter clothsand ceramic filters. There exists several types of vacuum filters, ranging frombelt filters to drums. The invention is, however, related to rotary vacuum drumfilters.
Rotary vacuum drum filters are used for the filtration of relativelyfree filtering suspensions on a large scale, such as the dewatering of mineralconcentrates. The dewatering of mineral concentrates requires large capacityin addition to producing a cake with low moisture content. The vacuum drumfilter may comprise a cylindrical support structure rotating around a longitudinalshaft forming a centre axis for the drum. There are a plurality of filter platesarranged on the outer surface of the cylinder. Each filter plate forms a portionof the cylindrical outer surface of the cylinder. Each filter plate is during eachrevolution of the shaft displaced for a certain period into a slurry basin situatedbelow the shaft. The filter plate rises out of the basin when the revolution of theshaft proceeds. When the filter plate is submerged in the slurry basin a cakeforms onto the outer surface of the filter plate due to the vacuum within thefilter plate. Once the filter plate comes out of the basin, the pores are emptied as the cake is deliquored for a predetermined time which is essentially limitedby the rotation speed of the drum. The cake can be discharged by a back-pulse of air or by scraping, after which the cycle begins again. The filter platesare advantageousiy made of porous ceramic.
The filter plates are in prior art solution attached with bolts to thedrum. There are fastening points provided with holes passing through the filterplate. A fastening flange is positioned into each hole in the filter plate. Thefastening flange comprises a hole passing through the fastening flange. Thefilter plate is fastened by bolts passing through the hole in the fastening flangein the filter plate. The holes passing through the filter plate will reduce the filterarea in the outer surface of the filter plate. The holes and the bolts passingthrough the filter plate will also increase the risk of leakage.
US 2,547,969 discloses a drum filter apparatus comprising filterpanels with an outer filter layer and an inner supporting surface, wherein theinner supporting surface is fastened to a rim structure via a plurality of boltsand wherein the filter layer remains unbroken.
BE 442 978 discloses a drum filter apparatus comprising filterpanels with an outer filter layer and an inner supporting surface, wherein theinner supporting surface is fastened to a rim structure via a plurality of boltsand wherein the filter layer remains unbroken.
BE 455 390 discloses a drum filter apparatus comprising filterpanels with an inner filter layer and an outer supporting surface, wherein theouter supporting surface is fastened to a rim structure via a plurality of boltsand wherein the filter layer remains unbroken.
BRIEF DESCRIPTION OF THE INVENTION An object of the present invention is to present a drum filter appa-ratus with an improved fastening arrangement for the filter plates in the appa-ratus.
The object of the invention is achieved by a fastening arrangementin a drum filter apparatus according to the independent claim 1. Preferred em-bodiments of the invention are disclosed in the dependent claims.
The drum filter apparatus comprises a cylindrical drum that is sup-ported with a rim structure on a rotatable shaft having a centre axis, an outersurface of the drum comprises a number of individual filter plates forming anessentially continuous cylindrical filter surface, each filter plate comprises an inner surface and a curved outer surface forming the filter surface of the filterplate, each filter plate is attached through at least three fastening points to therim structure. The fastening arrangement at each of the at least three fasteningpoints comprises: a first recess extending from the inner surface of the filter plate intoa portion of the filter plate so that the outer surface of the filter plate remainsunbroken, The fastening arrangement at each of the at least three fasteningpoints is characterized in that it further comprises: a fastening flange positioned at least partly in the first recess andbeing firmly attached to the filter plate, a longitudinal fastening member comprising a first end portion and asecond opposite end portion, the first end portion being attached to the fas-tening flange and the second end portion being attached to the rim structure, at least one snap locking means positioned in the fastening flangeor in the rim structure or in both and providing snap locking of the fasteningmember to the filter plate or to the rim structure or to both, wherein the filter plate is mounted on the drum by pressing the filter plate ra-dially to the drum so that the snap locking means locks the filter plate to the rimstructure of the drum.
The fastening arrangement in the drum filter apparatus according tothe invention will eliminate the holes passing through the filter plate. The outersurface of the filter plate will thus be unbroken, which leads to a bigger effec-tive filter area in the filter plate. lt is only the outer surface of the filter plate thatfunctions as the filter surface in the filter plate. The inner surface and the edgesurfaces of the filter plate are impervious to water.
The fastening arrangement in the drum filter apparatus is identical inall fastening points in the filter plate. This fact will lower the production costs ofthe fastening arrangement compared to a situation where the fastening ar-rangements in the different fastening points are different.
The fastening arrangement in the drum filter apparatus according tothe invention makes the connection and the disconnection of the filter plates tothe drum fast and efficient. The connection and the disconnection of the filterplates to the drum could be done e.g. by a vacuum lifter.
The fastening arrangement in the drum filter apparatus according tothe invention makes it easy to regulate the rigidity of the fastening of the filter plate to the drum. This can be done by changing the snap Iocking means. Thesnap Iocking means is in one advantageous embodiment a spring ring posi-tioned in a second groove within the second recess. The spring load is propor-tional to the cross sectiona| area of the spring ring. The rigidity of the fasteningof the filter plate can thus be altered by changing the cross sectiona| area ofthe spring ring.
BRIEF DESCRIPTION OF THE DRAWINGS ln the following the invention will be described in greater detail bymeans of example embodiments with reference to the accompanying draw-ings, in which Figure 1 is a perspective top view of a drum filter apparatus,wherein the inventive fastening arrangement may be applied, Figure 2 is a perspective top view of the drum of figure 1 with someof the upper filter plates being removed, Figure 3 is a cross section of the drum of figure 2, Figures 4 is a cross section of a filter plate showing a prior art fas-tening arrangement to the right in the figure and a fastening arrangement ac-cording to the invention to the left in the figure, Figure 5 shows the fastening flange of the inventive fastening ar-rangement in figure 4, Figure 6 shows the fastening member of the inventive fastening ar-rangement in figure 4, Figure 7 shows the fastening flange of figure 5 and the fasteningmember of figure 6 in an assembled form, Figure 8 is a cross section of a filter plate showing a second embod-iment of a fastening arrangement according to the invention, Figure 9 shows the fastening flange and the fastening member in adisassembled form.
Figure 10 shows a third embodiment of the invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Figure 1 is a perspective top view illustrating a drum filter apparatusin which the inventive fastening arrangement may be applied. The drum filterapparatus 10 comprises a frame 8, a cylindrical drum 20 supported within theframe 8, a slurry basin 9 under the drum 20. The drum 20 comprises a shaft 25that is supported at both ends with bearings 11, 12 on the frame 8. The shaft 25 and thereby also the drum 20 is rotatated by an electric motor 7 through agear. The drum 20 rotates around a centre axis X-X forming the longitudinalcentre axis X-X of the shaft 25.
Figure 2 is a perspective top view illustrating the drum of figure 1and figure 3 is a cross section of the drum 20 of figure 1. The drum 20 issupported with a rim structure 21 at the axial X-X middle point of the drum 20and at both ends of the drum 20. The rim structure 21 can be supported on theshaft 25 e.g. by a disc structure or by spokes. The rim structure 21 comprisesfurther a p|ura|ity of support members 22 attached to each rim 21. The supportmembers 22 are formed of straight bars having a rectangu|ar cross section.The support members 22 are attached to the rim 21 by axially X-X directedbolts passing through the support members 22 and being screwed into ho|es inthe side surface of the rim structure 21. The support members 22 are arrangedon the circumference of a circle having the centre on the centre axis X-X. Eachceramic filter plate 23 is attached to two opposite support members 22 so thatan outer surface 23B of the filter plates 23 forms the cylindrical outer filter sur-face of the drum 20. The axial X-X length of the drum 20 is divided into twosections. A first ring R1 of filter plates 23 is positioned on the first section of thedrum 20 and a second ring R2 of filter plates 23 is positioned on the secondsection of the drum 20. The filter plate 23 comprises a planar inner surface23A, a curved outer surface 23B and edge surfaces connecting the side edgesof the inner surface 23A and the side edges of the outer surface 23B of thefilter plate 23. The curvature of the outer surface 23B of the filter plates 23 co-incides with the circumference of the outer surface of the drum 20. The centreof the radius R forming the circumference of the outer surface of the drum 20 ison the longitudinal centre axis X-X of the drum 20.
The number of the ceramic filter plates 23 on the drum 20 may varydepending on the size of the drum 20. The diameter of the drum 20 may be inthe order of 1 to 5 meter and the length of the drum 20 may be in the order of 2to 10 meter. The filtering area of the filter plates 23 may be in the order of 10 to200 m2. A lower portion of the drum 20 is submerged in the slurry basin 9. Theouter surface 23B of the ceramic filter plate 23 has a microporous structure sothat water can enter into the filter plate 23. The interior of the filter plate 23 isporous so that water can travel within the filter plate 23. The inner surface 23Aof the filter plate 23 and the edge surfaces of the filter plate 23 are impervious to water. This means that water can penetrate into the filter plate 23 onlythrough the outer surface 23B of the filter plate 23.
Each filter plate 23 is also provided with a tube connector 29 inorder to provide a fluid duct from the interior of the the filter plate 23 to acollector piping 30 provided in the drum 20. The tube connector 29 in eachfilter plate 23 is connected to a radial inner tube 31 supported on the supportmember 22 and passing through the support member 22. The inner end of theradial inner tube 31 is connected to an axial tube 32 passing in the axial X-Xdirection through the drum 20. The axial tubes 32 are at one end of the drum20 connected to radial outer tubes 33. The radial outer tubes 33 extend fromthe outer edge of the drum 20 to the shaft 25 of the drum 20. The radial outertubes 33 are connected to a distributing valve 13 disposed on the shaft 25 ofthe drum 20. The distributing valve 13 transmits vacuum or overpressure to thefilter plates 23. The distributing valve 13 may comprise zones such that a partof the filter plates 23 are subjected to a higher vacuum or overpressure and apart of the filter plates 23 are subjected to a smaller vacuum or overpressure. lfa long drum 20 is used, it can be advantageous to have a distributing valve 13at both ends of the drum 20.
The vacuum system providing the vacuum through the collector pip-ing 30 to the filter plates 23 is not shown in the figures. The pump for removingthe filtrate from the collector piping 30 is also not shown in the figures. lt ispossible to arrange reverse flushing or backwash either such that some of thefiltrate or clean water from an external water source is led back to the collectorpiping 30 by means of a backwash system, such as a backwash pump.
As the drum 20 rotates, the filter plates 23 move into and throughthe basin 9. Each filter plate 23 goes through different process phases duringone revolution of the drum 20. ln a cake forming phase, the liquid is passingthrough the outer surfaces 23B of the filter plate 23 into the interior of the filterplate 23 when it travels through the slurry, and a cake is formed on the outersurface 23B of the filter plate 23. The filter plate 23 enters the cake dryingphase after it leaves the basin 9. lf cake washing is required, it is done in thebeginning of the drying phase. ln the cake discharge phase the cake isscraped off from the outer surface 23B of the filter plate 23 by ceramicscrapers so that a thin cake is left on the outer surface 23B of the filter plate23. There is thus a small gap between the scraper and the outer surface 23Bof the filter plate 23. ln the backflush phase of each rotation, water (filtrate) is pumped in a reverse direction from the inside of the filter plate 23 through thefilter plate 23 to the outside of the filter plate 23. The backflush water washesoff the residual cake and cleans the pores of the filter plate 23.
Figure 2 shows that each filter plate 23 comprises fastening pointsP1, P2, P3 comprising holes passing through the filter plate 23 in a radialdirection. The filter plates 23 are attached to the support members 22 by bolts70 passing through the holes in the fastening points P1, P2, P3. Two fasteningpoints P1, P2 are positioned at the axial X-X outer edge of the filter plate 23and one fastening point P3 is positioned at the axial X-X inner edge of the filterplate 23.
Figures 4 is a cross section of a filter plate showing a prior art fas-tening arrangement 50 to the right in the figure and a fastening arrangement100 according to the invention to the left in the figure.
The prior art fastening arrangement 50 shown to the right in figure 4comprises at each fastening point P1, P2, P3 a first hole 45 passing throughthe filter plate 23, a fastening flange 60, a rubber bushing 80 and a bolt 70.The fastening flange 60 comprises an upper portion 61 forming essentially acylinder and a second lower portion 62 forming essentially a collar. The upperportion 61 is fitted within the first hole 45 in the filter plate 23 and the collar likelower portion 62 is fitted against the inner surface 23A of the filter plate 23. Thefastening flange 60 can be attached by glue to the filter plate 23. The fasteningflange 60 comprises further a second hole 63 extending through the fasteningflange 60 from the upper portion 61 to the lower portion 62. The second hole63 has a first diameter within the upper portion 61 and a second smaller diam-eter within the lower portion 62 of the fastening flange 60. A landing 64 is thusformed within the second hole 63. The end part 71 of the bolt 70 will thus seatagainst the landing 64 when the bolt 70 is tightened. A first end of the cylindri-cal rubber bushing 80 extends partly into the lower portion 62 of the fasteningflange 60. A second opposite end of the cylindrical rubber bushing 80 is seatedagainst the upper surface of the support member 22. The exterior threads atthe outer end 72 of the bolt 70 are received by corresponding interior threadsin a hole in the support member 22. Tightening of the bolt 70 will press the filterplate 22 tightly against the upper surface of the support member 22. The firsthole 45 passing through the filter plate 23 at each fastening point P1, P2, P3will reduce the effective filtering area of the filter plate 23. The upper curvedfiltering surface 23B of the filter plate 23 is broken at each hole 45.
The fastening arrangement according to the invention 100 shown tothe left in figure 4 comprises at each fastening point P1, P2, P3 a first recess46 made into the filter plate 23, a fastening flange 110, a rubber bushing 130and a fastening member 120. The first recess 46 extends from the lower sur-face 23A of the filter plate 23 into a portion of the filter plate 23. The oppositesurface of the filter plate 23 remains unbroken at the first recess 46. The cylin-drical bushing 130 corresponds to the cylindrical bushing 80 in the prior artfastening arrangement. A first end of the cylindrical rubber bushing 130 ex-tends partly into the lower portion 112 of the fastening flange 110. A secondopposite end of the cylindrical rubber bushing 130 is seated against the uppersurface of the support member 22 or extends partly into the support members22.
Figure 5 shows the fastening flange of the inventive fastening ar-rangement. The fastening flange 110 comprises a first portion 111 forming es-sentially a cylinder with a closed end and a second portion 112 forming essen-tially a collar. The first portion 111 is fitted within the first recess 46 in the filterplate 23 and the second portion 112 is fitted against the lower surface 23B ofthe filter plate 23. The fastening flange 110 can be attached by glue to the filterplate 23. The fastening flange 110 comprises further a second recess 113 ex-tending from the second portion 112 towards the first portion 111 of the fas-tening flange 110 i.e. in the same direction as the first recess 46. There is fur-ther a circular second groove 114 extending radially into the inner surface ofthe second recess 113 within the first portion 111 of the fastening flange 110.
Figure 6 shows the fastening member of the inventive fastening ar-rangement. The longitudinal fastening member 120 has an essentially cylindri-cal form and comprises a first end portion 121 and an opposite second endportion 122 provided with an external thread. The first end portion 121 of thefastening member 120 comprises a first circular groove 123 extending radiallyinto the outer surface of the first portion 121 of the fastening member 120. Thesecond end portion 122 of the fastening member 120 comprises further a grip-ping portion 125 with two parallel planar side surfaces. The two parallel sidesurfaces form gripping surfaces for an adjustable wrench or fork wrench.
Figure 7 shows the fastening flange and the fastening member in anassembled form. This figure shows that first snap locking means 140 is fittedinto the second groove 114 in the fastening flange 110.
The fastening member 120 can be attached to the support member22 by threading the second end portion 122 of the fastening member 120 intoa corresponding hole 75 in the support member 22. There are exterior threadsat the second end portion 122 of the fastening member 120 and interiorthreads in the corresponding hole 75 in the support member 22. The hole 75can either extend only into a portion of the support member 22 or pass throughthe support member 22. The cylindrical rubber bushing 130 can then bepushed on the fastening member 120. The filter plate 23 can then be fastenedto the fastening members 120 protruding in a radial direction from the uppersurface of the support member 22 by pushing the filter plate 23 on the fas-tening members 120 so that the first end portions 121 of the fastening mem-bers 120 glide into the corresponding second recesses 113 in the first portion111 of the fastening flange 110. The filter plate 23 will be locked to the fas-tening member 120 by the spring ring 140 setting into the circular first groove123 on the fastening member 120. A first end of the cylindrical rubber bushing130 will extend partly into the lower portion 112 of the fastening flange 110 anda second opposite end of the cylindrical rubber bushing 130 will seat againstthe upper surface of the support member 22 or extend partly into the supportmember 22.
Figure 8 is a cross section of a filter plate showing a second embod-iment of a fastening arrangement according to the invention and figure 9shows the fastening flange and the fastening member in a disassembled form.Figure 9 illustrates the porous structure of the filter plate 23. The fasteningflange 110 corresponds essentially to the fastening flange shown in figure 5.The fastening flange comprises a first portion 111 having essentially the formof a cylinder and a second portion 112 having essentially the form of a collar.The first portion 111 is within the recess 46 in the filter plate 23 and the secondportion 112 is seated against the inner surface 23A of the filter plate 23. Thelongitudinal fastening member 120 forms advantageously an integral part ofthe fastening flange 110. The fastening member 120 is essentially cylindricaland comprises a first end portion 121 and a second end portion 122. The sec-ond end portion 122 of the fastening member 120 is incorporated with the sec-ond portion 112 of the fastening flange 110. The first end portion 121 of thefastening member 120 is provided with a first circular groove 123 extendingradially into the outer surface of the fastening member 120. There is a thirdrecess 115 extending in a direction opposite to the direction of the first recess 46 into the support member 22 in the rim structure 21. The third recess 115receives the first end portion 121 of the fastening member 120. The third re-cess 115 comprises a second circular groove 116 extending radially into thesurface of the third recess 115. The second circular groove 116 is providedwith second snap locking means 141. The support member 22 is also providedwith axial X-X ho|es 22A through which the support member 22 can be fas-tened to the rim 21 of the drum 20. The cylindrical rubber bushing 130 corre-sponds to the cylindrical rubber bushing 130 in figure 4. The rubber bushing130 is positioned between the fastening f|ange 110 and the support member22.
Figure 10 shows a third embodiment of the invention. This third em-bodiment corresponds to the second embodiment shown in figure 9 except thatthe fastening member 120 is in this embodiment fastened at both ends withsnap lock means. The fastening member 120 has an essentially cylindricalform and comprises a first end portion 121 and an opposite second end portion122. The first end portion 121 of the fastening member 120 is fastened withfirst snap lock means 140 to the fastening f|ange 110. The second end portion122 of the fastening member 120 is fastened with second snap lock means141 to support member 22. Both snap lock means 140, 141 are advantageous-ly identical. The first snap lock means 140 comprises a first spring ring posi-tioned in a circular groove 114 in a second recess 113 in the fastening f|ange110. The second snap lock means 141 comprises a second spring ring posi-tioned in a circular groove 116 in a third recess 115 in the support member 22.The fastening member 120 comprises a first circular groove 123 in the first endportion 121 and a second circular groove 124 in the second end portion 122.The first circular groove 123 and the second circular groove 124 extend radial-ly into the outer surface of the fastening member 120. The rubber bushing 130is positioned between the fastening f|ange 110 and the support member 22.The support member 22 is also provided with axial X-X ho|es 22A throughwhich the support member 22 can be fastened to the rim 21 of the drum 20.
The longitudinal fastening member 120 has advantageously an es-sentially cylindrical form with a circular cross section in all embodiments in theinvenfion.
The cylinder hat like form of the fastening f|ange 110 is an advanta-geous form. The fastening f|ange 110 can be attached with glue from the cylin-drical outer surface of the first portion 111, from the outer bottom surface of the first portion 111 and from the planar lower surface of the second portion 112 tothe filter plate 23. There is thus a fairly big fastening area for the glue betweenthe fastening flange 110 and the filter plate 23. The fastening flange 110 could,however, also have some other form. The fastening flange 110 should com-prise a second recess 113 or have the fastening member 120 fixedly attachedto the second recess 113 and have a form that fits into the first recess 46 in thefilter plate 23.
The fastening flange 110 and the fastening member 120 areadvantageously made of acid-proof steel. The fastening flange 110 is naturallytightly fitted in the recess 46 in the filter plate 23. The outer diameter of the firstportion 111 of the fastening flange 110 corresponds to the inner diameter ofthe recess 46 in the filter plate 23. The depth of the recess 46 in the filter plate23 corresponds to the depth of the first portion 111 of the fastening flange 110.The fastening member 120 is also tightly fitted in the second recess 113 in thefastening flange 110 and/or in the second recess 115 in the rim structure 21,22.
The filter plate 23 comprises in the figures three fastening points P1,P2, P3. Two fastening points P1, P2 are at the outer ends of the drum 20 andone fastening point P3 is at the middle of the drum 20 in the axial direction.Three fastening points P1, P2, P3 are needed in order to achieve a firmattachement of the filter plate 23. There could naturally be more than threefastening points P1, P2, P3 if a need for further fastening points would forsome reason arise.
The axial X-X length of the drum 20 is divided into two sections sothat there are two rings R1, R2 of filter plates 23 in the drum 20. There couldnaturally be more than two rings R1, R2 of filter plates 23 on the drum 20 oronly one ring of filter plates 23 on the drum 20. The appropriate number ofrings R1, R2 of filter plates 23 on the drum 20 depends on the length of thedrum 20.
The fastening of the filter plates 23 to the drum 20 need notnecessary be through the support members 22. lt might be possible to fastenthe filter plates 23 directly to the rims 21 of the drum 20. The inner surface 23Aof the filter plates 23 would thus have to be curved. The fastening of the filterplates 23 would thus be to the curved outer surface 23B of the rims 21. ln embodiments described herein, a material to be filtered isreferred to as a slurry, but embodiments of the invention are not intended to be restricted to this type of fluid material. The slurry may have high solids concen-tration, e.g. base metal concentrates, iron ore, chromite, ferrochrome, copper,gold, cobalt, nickel, zinc, lead and pyrite.
Upon reading the present application, it will be obvious to a personskilled in the art that the inventive concept can be implemented in variousways. The invention and its embodiments are not limited to the examples de-scribed above but may vary within the scope of the claims.
Claims (14)
1. A drum filter apparatus (10) comprises a cylindrical drum (20) thatis supported with a rim structure (21, 22) on a rotatable shaft (25) having acentre axis (X-X), an outer surface of the drum (20) comprises a number ofindividual filter plates (23) forming an essentially continuous cylindrical filtersurface, each filter plate (23) comprises an inner surface (23A) and a curvedouter surface (238) forming the filter surface of the filter plate (23), each filterplate (23) is attached through at least three fastening points (P1, P2, P3) to therim structure (21, 22), whereby the fastening arrangement at each of the atleast three fastening points (P1, P2, P3) comprises: a first recess (46) extending from the inner surface (23A) of the filterplate (23) into a portion of the filter plate (23) so that the outar surface (233) ofthe filter plate (23) remains unbroken, characterized in that the fastening arrangement at each of the atleast three fastening points (P1, P2, P3) further comprises: a fastening flange (110) positioned at least partly in the first recess(40) and being firmly attached to the filter plate (23), a longitudinal fastening member (120) comprising a first end portion(121) and a second opposite end portion (122), the first end portion (121) be~ing attached to the fastening flange (110) and the second end portion (122)being attached to the rim structure (21, 22), “ at least one snap looking means (140, 141) positioned in the fas-toning flange (110) or in the rim structure (21, 22) or in both and providing snaplooking of the fastening member (120) to the filter plate (23) or to the rim struc-ture (21, 22) or to both, wherein the filter plate (23) is mounted on the drum (20) by pressing the filterplate (23) radially to the drum (20) so that the at least one snap looking means(140, 141) looks the filter plate (23) to the rim structure (21, 22) of the drum(20).
2. A drum filter apparatus according to claim 1, characterized inthat the fastening flange (110) comprises a second recess (113) extending intothe fastening flange (110) in the same direction as the first recess (40), the firstend portion (121) of the fastening member (120) extending into the secondrecess (113), the second reoess (113) oomprising first snap looking means(140), whereby 14 the first end portion (121) of the fastening member (120) is attachedthrough the first snap iocking means (140) to the fiiter piate (23) and the sec-ond end portion (122) of the fastening member (120) is firmiy attached to therim structure (21, 22).
3. A drum fiiter apparatus according to ciaim 2, characterized inthat the first end portion (121) of the fastening member (120) comprises a cir-cuiar first groove (123) extending radiaiiy into the outer surface of the first endportion (121) of the fastening member (120), and that the first snap iockingmeans (140) comprises a spring ring inserted into a circuiar second groove(114) extending radiaiiy inte the inner surface of the second recess (113), theiocking of the fastening member (120) to the second recess (113) beingachieved by the first spring ring setting into the first groove (123) on the firstend portion (121) of the fastening member (120) when the fastening member(120) is pushed into the second recess (113).
4. A drum fiiter apparatus according to ciaim 2 or 3, characterizedin that the second end portion (122) of the fastening member (120) comprisesan externai thread for attaching the fastening member (120) by screwing to aninternai thread in a corresponding hoie (75) in the rim structure (21, 22).
5. A drum fiiter apparatus according to ciaim 1, characterized inthat the rim structure (21, 22) comprises a third recess (115) extending into therim structure (21, 22) in a direction opposite to the direction of the first recess(46), the second end portion (122) of the fastening member (120) extendinginto the third recess (115), the third recess (115) comprising second snap took-ing means (141), whereby the first end portion (121) of the fastening member (120) is fixediyattached to the fiiter piate (23) and the second end portion (122) of the fas-tening member (120) is attached through the second snap iock means (141) tothe rim structure (21, 22).
6. 0. A drum fiiter apparatus according to ciaim 5, characterized inthat the fastening member (120) forms an integrai part of the fastening fiange(110).
7. ?. A drum fiiter apparatus according to ciaim 1, characterized inthat the fastening fiange (110) comprises a second recess (113) extend-ing into the fastening fiange (110) in the same direction as the first recess (46),the first end portion (121) of the fastening member (120) extending into the second recess (113), the second recess (113) comprising first snap iockingmeans (140), the rim structure (21, 22) comprises a third recess (115) extendinginto the rim structure (21, 22) in a direction opposite to the direction of the firstrecess (46), the second end portion (122) of the fastening member (120) ex-tending into the third recess (115), the third recess (115) oomprising secondsnap looking means (141), whereby the first end portion (121) of the fastening member (120) is attachedthrough the first snap iocking means (140) to the fiiter piate (23) and the sec~ond end portion (122) of the fastening member (120) is attached through thesecond snap iocking means (141) to the rim structure (21, 22).
8. A drum fiiter apparatus according to any one of ciaims 1 to 7,characterized in that the snap iocking means (140, 141) comprises a springring being provided in a circuiar groove (114, 110) in the recess (113, 115) re-ceiving an end portion (121, 122) of the fastening member (120), whereby thecorresponding end portion (121, 122) of the fastening member (120) comprisesa groove (123, 124), the spring ring iocking into the respective groove (123,124) on the fastening member (120) when a respective end portion (121, 122)of the fastening member (120) is pushed into the recess (113, 115).
9. A drum fiiter apparatus according to any one of oiairns 1 to 8,characterized in that the fastening fiange (110) comprises a first portion (111)extending into the first recess (46) and a second portion (112) seated againstthe inner surface (23A) of the fiiter piate (23).
10. A drum fiiter apparatus according to ciaim 9, characterized inthat the first portion (111) of the fastening fiange (110) has essentiaiiy the formof a cyiinder with a ciosed end and the second portion (112) of the fasteningfiange (110) has essentiaiiy the form of a coiiar.
11. A drum fiiter apparatus according to any one of ciaims 1 to 10,characterized in that the fastening member (120) has essentiaiiy the form of acyiinder.
12. A drum fiiter apparatus according to any one of ciaims 1 to 11,characterized in that the fastening arrangement further comprises a bushing(130) of eiastic materia! positioned between the fastening fiange (110) and therim structure (21, 22) of the drum (20). 13
13. A drum tittar apparatus according to any one of ciaims 1 to 12,oharaotarizad in that the tastaning fianga (110) is attached to the tittar plate(23) by giuing.
14. A drum tittar apparatus according to any one of ciaims 1 to 13,oharaotarizad in that the rim structure (21, 22) oomprises support members(22) being attached to the rim (21) and forming a piane fastening surface forthe tittar piates (23).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20135542A FI125578B (en) | 2013-05-21 | 2013-05-21 | Rumpusuodinlaite |
PCT/FI2014/050384 WO2014188068A1 (en) | 2013-05-21 | 2014-05-20 | A drum filter apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
SE1551541A1 SE1551541A1 (en) | 2015-11-27 |
SE539804C2 true SE539804C2 (en) | 2017-12-05 |
Family
ID=51063451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE1551541A SE539804C2 (en) | 2013-05-21 | 2014-05-20 | Drum filter apparatus with fastening arrangement for the filter plates |
Country Status (10)
Country | Link |
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CN (1) | CN105263599A (en) |
AU (1) | AU2014270287B2 (en) |
BR (1) | BR112015028970B8 (en) |
CA (1) | CA2912090A1 (en) |
CL (1) | CL2015003340A1 (en) |
EA (1) | EA031027B1 (en) |
FI (1) | FI125578B (en) |
SE (1) | SE539804C2 (en) |
UA (1) | UA114970C2 (en) |
WO (1) | WO2014188068A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107510984A (en) * | 2017-11-03 | 2017-12-26 | 烟台青林矿山机械有限公司 | A kind of farm animal excrement fermentation tank water treatment plant |
SE542326C2 (en) | 2018-06-21 | 2020-04-14 | Valmet Oy | Vacuum filter |
CN113088358B (en) * | 2021-03-26 | 2022-06-24 | 中国石油大学(华东) | External expansion type gas filtering device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE455390A (en) * | ||||
BE442978A (en) * | ||||
US2547969A (en) * | 1948-01-28 | 1951-04-10 | Peterson Filters & Eng | Drum filter medium |
DE931825C (en) * | 1950-11-16 | 1955-08-18 | Buckau Wolf Maschf R | Rotary cell external filter |
CN202136852U (en) * | 2011-06-29 | 2012-02-08 | 杭州化工机械有限公司 | Filter component structure of pressurizing drum filter |
CN102716610B (en) * | 2012-06-27 | 2014-06-11 | 江苏赛德力制药机械制造有限公司 | Pressurization rotating drum filtering machine |
-
2013
- 2013-05-21 FI FI20135542A patent/FI125578B/en active IP Right Grant
-
2014
- 2014-05-20 SE SE1551541A patent/SE539804C2/en unknown
- 2014-05-20 WO PCT/FI2014/050384 patent/WO2014188068A1/en active Application Filing
- 2014-05-20 CA CA2912090A patent/CA2912090A1/en not_active Abandoned
- 2014-05-20 UA UAA201511102A patent/UA114970C2/en unknown
- 2014-05-20 BR BR112015028970A patent/BR112015028970B8/en active IP Right Grant
- 2014-05-20 AU AU2014270287A patent/AU2014270287B2/en active Active
- 2014-05-20 EA EA201592002A patent/EA031027B1/en not_active IP Right Cessation
- 2014-05-20 CN CN201480032226.8A patent/CN105263599A/en active Pending
-
2015
- 2015-11-13 CL CL2015003340A patent/CL2015003340A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FI125578B (en) | 2015-11-30 |
BR112015028970A2 (en) | 2017-07-25 |
BR112015028970B8 (en) | 2023-02-07 |
EA031027B1 (en) | 2018-11-30 |
CL2015003340A1 (en) | 2016-09-23 |
CA2912090A1 (en) | 2014-11-27 |
WO2014188068A1 (en) | 2014-11-27 |
AU2014270287A1 (en) | 2015-12-24 |
BR112015028970B1 (en) | 2021-09-28 |
EA201592002A1 (en) | 2016-07-29 |
CN105263599A (en) | 2016-01-20 |
SE1551541A1 (en) | 2015-11-27 |
FI20135542A (en) | 2014-11-22 |
UA114970C2 (en) | 2017-08-28 |
AU2014270287B2 (en) | 2016-07-14 |
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