EP0167560A1 - A method and apparatus for separation. - Google Patents
A method and apparatus for separation.Info
- Publication number
- EP0167560A1 EP0167560A1 EP19850900251 EP85900251A EP0167560A1 EP 0167560 A1 EP0167560 A1 EP 0167560A1 EP 19850900251 EP19850900251 EP 19850900251 EP 85900251 A EP85900251 A EP 85900251A EP 0167560 A1 EP0167560 A1 EP 0167560A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- scraper
- screenings
- grid
- movement
- screen
- 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.)
- Granted
Links
Classifications
-
- 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
Definitions
- the present invention relates to a method and an apparatus for separ ⁇ ating, from a liquid flow, for example a flow of wastewater, solid pol ⁇ lutants and, more precisely, a method, employing an apparatus which includes a screening grid, for trapping pollutants from liquid passing through the grid and, by means of scraper devices, for cleaning the grid and for removing pollutants trapped on the grid.
- Prior Art mechanical separation devices for coarsesolid pollutants consist of a screening grid com ⁇ prising parallel bars between which there are formed gaps normally of a width of from 10 to 15 mm.
- the grid is disposed in a channel along which the polluted liquid flows, the location of the grid being such that the liquid is forced to flow through the gaps which the grid creates.
- the gaps are oriented ' substantially vertically and with the upper portion of the grid slightly offest in the direction of flow of the liquid.
- scraper rake
- pollutants screenings
- the scraper being moved, during the removal operation of the pollutants, upwardly along the grid bars and in abutment against them.
- the scraper is fixed by means of arms to chain driven hoists which, in their upward movement, move the scraper from the lowermost edge of the grid to such a level above the surface of the liquid that the screenings may readily be taken care of, for example transferred to a receptacle or transported further by means of a conveyor.
- the scraper is, at it highest position, at least approximately 1.5 m.
- Prior Art em ⁇ bodiments of screening grids with straight grid bars from which the screenings are separated by means of scrapers suffer from the drawback that they require tall building heights and, consequently, tall ceil ⁇ ing height, because of the length of travel of the scraper. The total length is determined by the depth of the liquid and requisite lifting height for the screenings above the surface of the liquid.
- prior Art grid constructions are unwieldy and expensive. This latter circumstance is further accentuated by the fact that the construction should preferably be of stainless steel.
- the present invention which relates to "machine-cleaned grids", sub ⁇ stantially obviates the above-outlined drawbacks, since the total building height requirement of the installation may, in the great ma ⁇ jority of cases, be reduced by approximately half in comparison with prior Art equipment. This is effected by means of a reduction of the requisite movement space for the members which realise clean-scraping of screenings from the screen grid and movement of such screenings in a direction towards a receptacle facility. Moreover, it is possible, according to the present invention, to utilize more smoothly and even ⁇ ly operating driving means than the previously-used electro-mechanical driving means which include an electric motor, gearing, one or more chain hoists and requisite journalling.
- An apparatus for separating solid pollutants from liquids includes, according to the present invention, a grid of the fundamentally con- ventional type as described above, i.e. a straight grid made up of parallel bars with substantially vertical orientation.
- the apparatus further includes at least two inter-cooperating scraper members which are provided with scraper blades which entrain screenings collected aga ⁇ mst the grid on movement along the grid and/or in a preferred ern- bodiment, along an extension section connected to the grid.
- a first, lower scraper member moves its scraper blade or blades substantially along that section of the grid which is passed by the liquid flow, for drawing-up collected screenings from the liquid flow, while the remaining scraper members move their scraper blades substantially along the residual section of the grid and/or, where applicable, along the extension section for continued transport of the screenings, eg. to receptacle means.
- the apparatus includes one or more shoulder-like regions located in the transition between two mutually adjacent scraper members.
- the first of the scraper members moves the screenings to one such shoulder-like region, and the other moves the screenings from the shoulder-like region.
- a corresponding cooperation takes place between the scraper members.
- the grid, the extension section or the transition region is disposedbetween the grid and the extension portion with the shoulder-like regions.
- compression means are provided for compression of the screenings during their stay-time on each respective shoulder-like region, whereby the proportion of water in the screenings will be reduced.
- each respective scraper member is disposed to be reversible, there being formed an abutment surface which is urged by the scraper member against screen ⁇ ings located on each respective shoulder-like region.
- the scraper blades of the scraper members form the above-outlined comp ⁇ ression means.
- each respective abutment sur- face is reversed prior to the movement of the scraper member for mov ⁇ ing the screenings into an orientation which is substantially at right angles to the direction of movement of each respective scraper blade during movement of the screenings.
- the abutment surface will thereby constitute that surface which shifts the screenings to sub- sequent transitional regions between two mutually adjacent scraper members.
- the lower scraper member completes more than one reciprocal movement between each such movement in which the remaining scraper members move the screenings in a direction towards a receptacle.
- the lower scraper member is disposed also on its downward movement to abut against the bars of the grid, at least along a restricted portion of this travel, this res ⁇ tricted travel being preferably located in a region at and slightly below the surface of the liquid.
- the lower scraper member is designed with a view to transport by flow- ing liquid and to cleaning the gaps between the bars of the grid, while the scraper member or members operating above the surface of the liquid are designed in adaptation to meet, for example, the requirement of de-watering of the screenings and their further conveyance to recep ⁇ tacle means.
- the extension section disposed in association with the grid and preferably above the surface of the liquid is designed as a slip plane for cooperation with one or more scraper members.
- each such scraper member is operated by a sep- arate prime mover, for example a compressed air cylinder which controls the position of the scraper blade in relation to the surface of the slip plane so that the scraper blade is located slightly above or, alternatively, abuts against the slip plane.
- a sep- arate prime mover for example a compressed air cylinder which controls the position of the scraper blade in relation to the surface of the slip plane so that the scraper blade is located slightly above or, alternatively, abuts against the slip plane.
- the movement of the scraper members along the grid and, where applic ⁇ able, along the extension section, is suitably realised by a joint prime mover, for instance a compressed air cylinder whose stroke length is adapted according to the longest individual scraping ove- ment.
- a joint prime mover for instance a compressed air cylinder whose stroke length is adapted according to the longest individual scraping ove- ment.
- Each one of the scraper members is preferably in cooperation with a sled-like device which is connected to the prime mover.
- a number of, or all of, the scraper members utilize one common such sled-like device, while, in other embodiments of the pre ⁇ sent invention, each scraper member is provided with its separate sled- like device.
- Fig. 1 is a section taken through one preferred embodiment of an ap ⁇ paratus according to the present- invention.
- Fig. 2 is a front elevation of the apparatus.
- the Drawing figures illustrate one embodiment of the invention in which the separation apparatus is composed of a lower portion which essential ⁇ ly comprises a grid 10, and an upper portion which essentially comprises an extension section 20. There is further disposed a first, lower scrap ⁇ er member 40, substantially for cooperation with the grid 10, and a second, upper scraper member 50, substantially for cooperation with the extension section 20.
- the grid 10 comprises a number of grid bars 11 forming gaps 12 there ⁇ between.
- the distance between the grid bars is adapted to suit the size of the particles which are intended to be trapped by the grid bars on passage of the liquid through the grid.
- the grid merges into the extension section 20 which is shown on the Drawings as including a slip plate 21 which forms a substantially downwardly directed supporting surface in a trough- like part of the extension section 20.
- the slip plate forms a shoulder-like portion 22 which connects with the grid 10.
- the first, lower scraper member 40 is provided with a scraper blade 41 for cooperation with the grid 10.
- the blade is fitted with prong-like members which, when the blade abuts against the grid bars, penetrate into the space between the bars.
- An operating device 42 is fixedly retained in relation to a sled 30 and is connected to the first scraper member for adjustment of its distance, and thereby the distance of the scraper blade 41, to the grid bars 11.
- the second, upper scraper member 50 is, similarly, provided in its lower region with a scraper blade 51 for cooperation with the slip plate 21.
- An operating device 52 Is fixedly retained in relation to the sled 30 and is connected to the second scraper member for adjustment of its distance, and thereby the distance of the scraper blade 51, to the supporting surface of the slip plate 21.
- a path 35 Is provided for the sled 30 which, In its turn, is connected to driving means 31 which reciprocate the sled along the path 35.
- Fig. 1 also shows that the grid 10 is immersed in a liquid 60 which flows in the direction indicated by the arrows A.
- Reference numeral 61 refers to the surface of the liquid.
- the Drawing figure further in ⁇ timates the presence of an outer casing 80 which covers the extension section 20.
- the Drawing figure also shows a receptacle 70 placed on a substrate, for example a floor 62, the receptacle receiving the screenings which are shifted by the second, upper scraper member 50 past the upper edge 23 of the extension section.
- the operating device 42 and the oper ⁇ ating device 52 maintain the abutment of each respective scraper blade against the grid bars 11 and the slip plate 21, respectively, whereby both the screenings gathered against the grid bars and the screenings located on the shoulder-like portion 22 will be shifted in a direction towards the receptacle 70.
- the driving means 31 subsequently recipro ⁇ cates the sled 30 to its starting position.
- the scraper blades are, as a rule, raised from the grid bars and the slip plate 21, respectively, for a pre-determined and pre-set length of the movement.
- the lengths of the extension section 20 and the grid 10 are mutually adapted and adapted to the stroke length of the driving means 3T of the sled so that, during the final phase of the movement of the sled, screenings from the grid 10 will be deposited on the shoulder-like portion 22, at the same time as the screenings which the second, upper scraper member 50 just previously removed from the shoulder-like por- tion will be reliably and safely deposited - or will have already been deposited - in the receptacle 70.
- the scraper blade cleans the gaps bet- ween the grid bars in that the prong-like members of the scraper blade are passed in the spaces between the bars.
- An apparatus according to the present invention may be realised in a great number of embodiments in which the apparatus is adapted to meet its specific operative requirements.
- more than one sled is employed for movement of the scraper members, while in certain physical applications, each sled is combined with a separate prime mover for transport of the sled.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Chain Conveyers (AREA)
- Filtration Of Liquid (AREA)
Abstract
Procédé et appareil pour séparer d'un écoulement liquide (60) des particules solides entraînées dans ledit écoulement. Un tamis à grille (10) est disposé dans l'écoulement liquide et est doté de barres espacées piégeant les particules, formant ainsi les produits de criblage. Un premier élément de racloir inférieur (40) est disposé pour effectuer un mouvement vertical de va-et-vient le long de la grille du tamis et bute, pendant sa course vers le haut, contre la grille, les produits de criblage recueillis contre la grille du crible étant amenés à une partie (22) similaire à un épaulement pour le stockage temporaire des produits de criblage. Un autre élément de racloir supérieur (50) amène les produits de criblage en direction d'un réceptacle (70). Les produits de criblage sont déshydratés lorsqu'ils se trouvent dans la partie similaire à un épaulement et, en principe, également à la suite de leur déplacement en direction du réceptacle le long d'une plaque de glissement (21). La construction comprenant plus d'un éléments de criblage réduit l'encombrement vertical et permet l'adaptation individuelle des éléments de racloir aux exigences fonctionnelles qui prévalent.Method and apparatus for separating solid particles entrained in said flow from a liquid flow (60). A grid screen (10) is disposed in the liquid flow and has spaced apart bars trapping the particles, thereby forming the screening products. A first lower squeegee element (40) is arranged to perform a vertical reciprocating movement along the screen grate and abuts, during its upward stroke, against the screen, the screening products collected against the the screen grid being brought to a part (22) similar to a shoulder for the temporary storage of the screening products. Another upper squeegee element (50) feeds the screening material towards a receptacle (70). The screening products are dehydrated when they are in the part similar to a shoulder and, in principle, also as a result of their movement in the direction of the receptacle along a sliding plate (21). The construction comprising more than one screening elements reduces the vertical bulk and allows the individual adaptation of the scraper elements to the prevailing functional requirements.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85900251T ATE33948T1 (en) | 1983-12-27 | 1984-12-19 | METHOD AND DEVICE FOR SEPARATION. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8307171A SE440029B (en) | 1983-12-27 | 1983-12-27 | SEPARATION DEVICE |
SE8307171 | 1983-12-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0167560A1 true EP0167560A1 (en) | 1986-01-15 |
EP0167560B1 EP0167560B1 (en) | 1988-05-04 |
Family
ID=20353896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850900251 Expired EP0167560B1 (en) | 1983-12-27 | 1984-12-19 | A method and apparatus for separation |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0167560B1 (en) |
DE (1) | DE3470851D1 (en) |
SE (1) | SE440029B (en) |
WO (1) | WO1985002794A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1048836B (en) * | 1957-06-25 | 1959-01-15 | Voith Gmbh J M | Trash rack cleaning machine, especially for inlet rakes of water power machines |
SE309391B (en) * | 1967-03-28 | 1969-03-17 | Tolu Ab | |
CH600060A5 (en) * | 1975-12-11 | 1978-06-15 | Mecafina Sa | |
DE2629603C3 (en) * | 1976-07-01 | 1979-11-08 | Dambach-Industrieanlagen Gmbh, 7560 Gaggenau | Rake cleaner with rake |
-
1983
- 1983-12-27 SE SE8307171A patent/SE440029B/en not_active IP Right Cessation
-
1984
- 1984-12-19 EP EP19850900251 patent/EP0167560B1/en not_active Expired
- 1984-12-19 WO PCT/SE1984/000434 patent/WO1985002794A1/en active IP Right Grant
- 1984-12-19 DE DE8585900251T patent/DE3470851D1/en not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8502794A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1985002794A1 (en) | 1985-07-04 |
SE440029B (en) | 1985-07-15 |
SE8307171D0 (en) | 1983-12-27 |
EP0167560B1 (en) | 1988-05-04 |
DE3470851D1 (en) | 1988-06-09 |
SE8307171L (en) | 1985-06-28 |
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