SE1450963A1 - Filtering device comprising a conveyor belt provided with perforated segments - Google Patents

Abstract

16 Summary Filtration device (1) for separating solid particles and other objects from water. The device comprises a conveyor belt (2) which is arranged to run in a closed path through a water floc. The conveyor belt (2) comprises inboard articulated perforated segments (15), each segment (15) having a first long side (22a) and a second long side (22b) opposite said first long side. The long sides (22a, 22b) have a longitudinal extension transverse to the direction of movement of the web and two facing each other. short sides (23) with a longitudinal extension along the direction of movement of the web. The first long side (22a) of each segment (15) comprises a hook portion (24) which is hingedly hooked into a hook portion (24) of the second long side (22b) of a door on the following segment (15) to form said closed path. For publication: Fig. 3

Description

Technical area The present invention relates to a filtration device for separating solid particles and other forms of water.

Background of the technology Filtration devices anyands for example for separation of solid particles and other objects from municipal and industrial wastewater. One type of filtration device forms a perforated conveyor belt which is formed 10 of a large number of inboard articulated perforated segments. The conveyor belt is led in an elongated closed path through a soiled water flow whereby the particles and the objects which cannot pass the perforations are captured and can be transported away Than the water floc. The waste thus collected can be separated by the conveyor belt through to For example, a brush, a water flood, compressed air or a scraper.

Conveyor belts for this type of application are usually made of a large number of inboard articulated segments. The segnnent can, for example, be inboard connected by means of gangjam which extends across the direction of movement of the conveyor belt. Other solutions include segments Which along a first long side are hingedly fastened about an axis extending transversely to the direction of movement of the conveyor belt and where the opposite second long side is arranged to overlap the correspondingly hingedly fastened first long side of a second adjacent segment. A typical example of such a solution is given, for example, by US2006 / 0070858. The overlap forms something Which can be likened to a labyrinth infeed which prevents particles and molds from penetrating into and getting stuck in the gap between two consecutive segments. There are also examples where the conveyor belt is provided with loose sealing strips that stack in or across the gap between two consecutive segments. This is described, for example, in US 7,510,650. 2 When designing a conveyor belt, it is important to avoid unnecessary gaps. This applies to the gap between the individual segments as well as between the conveyor belts and the side cradles that enclose the conveyor belt along the longitudinal side cradles of the framework. Through these columns can through it The relatively high velocity of the flowing water corresponding to large particles and formals pass more or less unhindered and follow with the filtered water. As a result, the water is not sufficiently purified, which may require further purification and / or problems in the subsequent treatment of the water. Alternatively, excessive particles and molds get stuck in the gaps, which 10 can damage both the conveyor belt and its drive. In the long run, this can lead to the entire filtering device stopping working.

Summary of the invention The spirit of the present invention is to provide one Filtering device for separating solid particles and other objects from water comprising a conveyor belt which lacks gaps between adjacent segments. Columns in this respect refer to consistently substantially straight-line openings between two successive segments.

Another key is that the conveyor belt should be easy to manufacture and assemble to the desired length.

Another key is that the conveyor belt can be mounted in existing filtration devices against minor modifications.

These and further molds are filled by a filtration device for separating solid particles and other molds from water.

The filtration device comprises a conveyor belt arranged to run in a closed web through a water flow, which conveyor belt comprises inboard articulated perforated segments, each segment having a first long side and a second long side opposite said first long side which long sides have a longitudinal extension transverse to the direction of movement of the web and two opposite Adjacent short sides with a longitudinal extension along the direction of movement of the web, the first long side of each segment comprising a hook portion which is hingedly hooked into a hook portion of the second long side of a mandrel on the following segment to form said closed web. 3 The filtration device can be used for various applications where there are requirements for separation of particles and other objects. This may, for example, refer to the filtration of so-called amber water in connection with amber water intake for waterworks and cooling water systems. It can also, for example, refer to filtering of 5 municipal or industrial wastewater. The conveyor belt is assembled to the desired length by interconnecting a desired number of perforated segments which are hooked together side by side with the aid of mutually cooperating hook portions. By hooking, the conveyor belt obtains a surface which lacks substantially linearly continuous gaps through which particles and other 10 forennal which one intends to separate unintentionally may be led or stuck. This reduces the need for maintenance. Furthermore, further subsequent purification is facilitated of the filtered water in cases where the processor demands such.

The individual segments can be manufactured at a very low cost and in turn allow a very simple assembly to form the conveyor belt. 15 closed lanes. No additional fastening elements are required, such as hinges, shafts or screws, which in turn also affects the total cost.

The hooking produces something resembling a labyrinth in which the debris captured by the perforated segments under the belt continuous feeding in the closed path is prevented from "migrating" in through 20 the hook joint and get out on the back of the segments and there are received by filtered water.

Furthermore, the commonly used cleaning of the conveyor belt is facilitated where the particles and the waste captured by the perforations of the segments are continuously removed with the aid of, for example, rotating brushes. 25 shavings, water or compressed air. This cleaning often takes place in connection with the conveyor belt changing direction over a breaker roller. With a belt construction according to the invention, in case the filtering device is otherwise in a water flow which is primarily directed towards the outside of the conveyor belt, in such a change of direction there will be a natural opening of the joint because two Successive segments during this change of direction are angled and partially open up the hook joint and thereby provide access for brush / flush water / compressed air in the space between the long sides of the two segments. Despite the fact that the hook bandage has partly been opened up, it remains earlier 4 discussed the gap-free labyrinth entry which prevents the snout from migrating down to the underside of the conveyor belt. In the case of the filtering device anyands in a water flow which is primarily directed towards the inside of the conveyor belt, instead something similar to a self-cleaning takes place due to the inevitable inboard 5 movement between the segments.

Each segment, seen in a cross-section transverse to the longitudinal direction of the belt, has a substantially S-shaped cross-section with a life extending between a first and a second chin portion. The substantially S-shaped cross-section can be easily obtained by bending. It is realized that life itself can be given differently 10 cross sections. Life advantageously has a curvature, bending or step shape transverse to the direction of movement of the web to give the segments sufficient rigidity to withstand the pressure -Iran flowing water. The segments may also be provided with one or more stiffeners.

The first and second chin portions may comprise a flange as seen in one 15 areas adjacent to the long side of the segment form an angle relative to the waist of less than 60 degrees. The angle advantageously has a size within the range of 2550 degrees.

Each segment can include two opposing sides along its short sides side rocker element with a longitudinal extension along the path of movement of the web Direction, where the sidewall elements of two successive segments together form two opposite sidewalls extending along the direction of movement of the belt, each segment being arranged to extend between two successive sidewall elements, and each segment being fixedly connected to a first of two consecutive side cradle 25 elements.

Because each segment is arranged to extend between and be in contact with two successive side cradle elements, a substantially gap-free and continuous side cradle is formed on opposite sides of the conveyor belt. The segments together with the side cradle elements give the conveyor belt one Trough-shaped cross-section with a depth corresponding to the height of the side wall elements. Furthermore, the fixed connection contributes to the rigidity of the segments so that they can withstand the pressure of flowing water. The fast the connection also reduces a gap formation between the short sides of the sign and the side cradle elements.

The respective side cradle elements may comprise a water console against the life of the segment for fixed connection of the life of the segment to the side cradle element. The life of the segments can be connected to the brackets by eg screwing, welding or riveting. Through this, a form of labyrinth feed is formed between segments and side cradle elements along the direction of movement of the belt.

The conveyor belt may be arranged to be propelled by a drive chain which cooperates with the side cradle elements, which drive chain comprises running rollers and Lance arms extending between the loop rollers to form a closed drive chain, each side wall element comprising a recess for receiving a center axis of the respective 10 roller, the center shaft being movable in said recess between said insertion layer in which the center shaft is allowed to pass in a recess. direction perpendicular to the sidewall element A spreading plane and a drive bearing in which the center axis is allowed to rotate freely relative to the recess but at the same time has a limited passability in the direction perpendicular to the spreading plane of the side wall element.

The recess and its interaction with the center axis of the 10 roll can be likened to a bayonet coupling, which provides a simple assembly and not least disassembly of the drive chain relative to the conveyor belt.

The recess for receiving a center shaft may be in the form of a long shaft having a first portion having a first diameter and a second portion having a second diameter, the center shaft in its drive bearing being substantially centered relative to said second portion. This type of long haul is forced to the side rock The elements to a centering relative to the drive chain which reduces wear.

The center shaft can be arranged to be retained in said drive layer by means that longitudinal arms adjacent to the barrel roller are hingedly connected to side rail elements opposite to the respective respective long arm. The articulated connection is most easily allowed through a pivot pin that sticks in between Side rocker element and the nearest side rocker element arranged the lane arm. 6 In another aspect, the invention relates to the use of a filtration device as described above for separating particles and other forms of water.

Brief description of the drawings The invention will now describe in more detail with reference to the accompanying drawings.

Figs. 1a and 1b show perspective views seen from the front and rear, respectively, of an example of a filtration device intended for filtering water with the aid of a flow of water from the outside and towards the conveyor belt.

Fig. 2 shows a second example of a filtration device in which the waste water is led through the conveyor belt from the inside out.

Fig. 3 shows a part of a conveyor belt with side cradles and drive chain. Fig. 4 shows a cross section of two articulated hinged segments.

Fig. 5 shows a partial enlargement of the hook portions of two articulated hooks segment.

Fig. 6 shows the back of a part a conveyor belt.

Fig. 7 shows an example of the interaction between the drive chain and the framework.

Description of a preferred embodiment Referring to Figs. 1a and 1b, an example of a filtration device 1 which is intended for filtering a flood of water. The filtering device 1 comprises a framework 3 in which a perforated conveyor belt 2 25 is guided in a closed path over two at a distance Than mutually arranged two breaking rollers 11. Only the lower breaking roller 11 is shown. For ease of clarity, the conveyor belt 2 is shown without perforations. The upper part of the filtration device 1 comprises a first motor 4 which is intended to feed the conveyor belt by driving the upper breaking roller (not shown).

The filtering device 1 further comprises in its upper part a second motor 5 for operating a belt cleaning device (not shown). The belt cleaning device can, for example, be constituted by a rotating brush which abuts 7 towards the conveyor belt. It will be appreciated that other cleaning methods are also possible such as shaving, flooding or compressed air.

The framework 3 comprises two opposite side cradles 6 which extend along the conveyor belt 2. Each side cradle 6 has in the shown In the embodiment two openings 7. It will be appreciated that the number of openings 7 and their geometry may vary. Furthermore, the frame 3 in its upper front cradle portion comprises roof plates 8 which stack between the two side cradles 6. The roof plates 8 are arranged as inspection hatches to allow access of the conveyor belt 2 along substantially its entire length.

With special reference to Fig. 1b, the framework 3 comprises in its shown embodiment on its rear side two struts 9 which extend between the side cradles 6 for stiffening the framework 3. In the embodiment shown, the rear side of the framework 3 is thus essentially Open. It will be appreciated that the back may be tacked with one or more tack plates.

The framework 3 further has in its upper rear portion a hood 9 with a lower opening 10. The cover 9 with its opening 10 forms a passage for diverting the particles and the waste which has been captured by the conveyor belt 2 and which is separated by means of the belt cleaning device (not shown).

In use, the filtration device is intended to with its lower be immersed in a stream of dirty water in such a way that the conveyor belt 2 extends substantially across the stream of dirty water. The river is illustrated by arrows in Fig. 1 a.

When the dirty water hits the conveyor belt 2, particles and Other waste with a size exceeding the perforations to be prevented from passing the conveyor belt 2 at the same time as the filtered water is allowed to pass the perforations and is discharged primarily via the back of the framework 3. There is also a lateral diversion and removal of the filtration device 1 through the openings 7 in the side cradles 6 of the framework 3.

Through the conveyor belt 2 feeding in a closed path, they come thereby separating the particles and the waste to be led up and away from the flood. In order to avoid the particles and the waste being returned to the conveyor belt's return carriage, the particles and the waste are separated. 8 the belt 2 with the aid of the belt cleaning device (not shown). The separated waste can be collected in a vessel (not shown) for further destruction.

Referring now to Fig. 2, another principle of a filtration device 1 is shown. The overall principle is the same as that of 5 described above, but with the difference that the water, see arrows, to be filtered is directed towards the inside of the closed path formed by the perforated conveyor belt 2. For illustrated purposes, the conveyor belt is shown without perforations. The water flow is forced to a change of direction of a rear side cradle portion 12 of the framework 3 and is forced through the conveyor belt 2 and 10 further out through openings 13 in the opposite side cradles 14 of the framework 3. The particles and the waste which are separated are thereby captured on the inside of the conveyor belt 2. In this type of filtration device, the separated waste is removed by the waste falling off the conveyor belt 2 through the inward movement of the segments 15 and can be collected at the bottom of the filtration device 1. The principle in general is the same as above and is therefore not described further.

Referring now to Fig. 3, a portion of a conveyor belt 2 in accordance with the invention is shown. The conveyor belt 2 is applicable in, for example, the types of filtration devices described above. For Fig. 3 shows two segments 15 which have been lifted up Than conveyor belt 2. The conveyor belt 2 which is thus built up of a number of inboard articulated segments 15 forming a bottom surface 16. To facilitate ash lying, the perforations of the segments 15 have been omitted.

The conveyor belt 2 is laterally delimited by two opposite ones, essentially Continuous side cradles 17 formed by a number of inboard cooperating side cradle elements 18. The side cradles 17 together with the segments 15 give the conveyor belt 2 a substantially trough-shaped cross-section seen in a direction along the direction of movement of the web (arrow A). The side cradle elements 18 are in turn connected to a drive chain 19. The drive chain 19 comprises longitudinal arms 20 which extend Between drive rollers 21. A drive chain is advantageously arranged on opposite sides of the conveyor belt 2.

Referring to Figs. 4 and 5, there is schematically shown a cross-section of two internally articulated segments 15. Fig. 5 shows a partial enlargement of 9 the connection between the segments 15. In the cross-sections shown, the length of the long sides of the segments is greatly reduced in relation to the length of the short sides.

Each segment 15 has a first long side 22a and a second long side 22b opposite said first long side 22a. Long sides 22a, 22b 5 has a longitudinal extension, see arrow B across the direction of movement of the web, see arrow A. Each segment 15 further has two opposite short sides 23 with a longitudinal extension along the direction of movement of the web, see arrow A.

Each segment 15 has, seen in a cross-section transverse to the direction of movement of the belt, see arrow A, a substantially S-shaped cross-section with one between a first and a 10 second chin 24 extending life 25. Life is provided with perforations P.

The web 25 which forms the very bottom surface 16 of the conveyor belt 2 has in the embodiment shown a bent cross-sectional profile forming two folds 26 which extend across the direction of movement of the belt, see arrow A. The folds 26 help to give rigidity to the segments 15 to withstand the water flow. Further contributes Weeks 26 to retain collected waste before separation. It will be appreciated that the cross-sectional profile of the life may be varied and that the invention should not be limited to the embodiment shown. It is also understood that the segments 15 can be provided with stiffening rails which extend along and / or across the segments seen in the direction of movement of the web.

The hook portions 24 are arranged to extend along the segments opposite long sides 22a, 22b. In the embodiment shown, the hook portions 24 are formed so that the long sides 22a, 22b have been bent to form flanges 27 which, seen in an area adjacent to the long side 22a, 22b of the segment, form an angle α relative to the web 25 of less than 60 degrees. The angle a is 25 preferably 25-50 degrees.

The hook portion 24 on the first long side 22a of each segment 15 is hingedly hooked in the hook portion 24 of the second long side 22b of a door on the following segment 15 to form said closed web.

Now with a new male view to Fig. 3, each segment 15 is along its own 30 opposite short sides 23 connected to two opposite side cradle elements 18. The side cradle elements 18 have a longitudinal extension along the direction of movement of the web, arrow A.

The side cradle element 18 has seen along the direction of movement of the web, arrow A, a first and a second short side 28a, 28b. The short sides 28a, 28b have inboard complementary profiles which in the embodiment shown consist of a convex single-hook first short side 28a and one with this concave, 5 complementary single hook second short side 28b. The short sides 28a, 28b of two successive side cradle elements 18 can thereby slide against each other and form a substantially gap-free abutment against each other even when the conveyor belt 2 is a change of direction over a breaking roller. Furthermore, the side cradle elements 18 together form a continuous substantially gap-free side cradle 17 10 which extend along and on opposite sides of the closed path of the conveyor belt 2.

The respective side cradle elements 18 comprise a bracket 29 against the web 15 of the segment 15. The bracket 29 has a profile corresponding to a part of the cross section of the segment 25's life 25. The bracket 29 is suitably made of a Bent profile which is welded or otherwise connected to the side cradle element 18.

Each segment 15 is fixedly connected to a first of two consecutive side cradle elements 18. In the embodiment shown, the segments 15 are screwed to the brackets 29. Other fastening methods can also be used. 20 is used, eg welding or riveting.

In the embodiment shown, habit segment 15 is arranged to extend between two successive side wall elements 18. This is done by the first long side 22a of a first segment 15a being offset relative to the corresponding convex short side 28a of the first side wall element 18a simultaneously. As its opposite second long side 22b offset relative to the side rock the opposite concave short side 28b of the element and thus protrudes beyond it.

Referring to Figs. 3 and 6, the conveyor belt 2 is arranged to be propelled by a drive chain 19 which cooperates with the side cradle elements 18. The drive chain 19 comprises running rollers 21 and longitudinal arms 20 extending between the running rollers 21 to form a closed drive chain 19. In the embodiment shown, two mutually parallel longitudinal arms 20 extend between two successive running rollers 21. The link arms 20 are rotatably connected to 11 the center shafts 30 of the race rollers 21 are truly articulatedly connected to the side cradle elements 18 via pivot pins 31.

The drive chain 19 cooperates with the side cradle elements 18 in that each side cradle element 18 comprises a recess 32 for receiving a center axis The recess 32 has the shape of a long tail with a first 33 portion having a first diameter and a second portion 34 having a second diameter. It will be appreciated that at least the first portion 33 may have a different geometry than a substantially circular one.

The center shaft 30 preferably has a duck profile (not shown) with one Which has a geometry which is less than the diameter of the first portion 33 of the recess 32 but which at the same time exceeds the diameter of the second portion 34 of the recess 32. The essential thing is that the center axis 30 has a duct profile which can be freely inserted in and out through the first portion 33 but which is prevented from being moved in or out through the second portion 34 in a direction perpendicular to the side rocker 15 element 18 distribution plane.

When mounting the drive chain 19 relative to the side cradle elements 18, the spirit of the center shaft 30 of the caster 21 which is water against the side cradle member 18 is moved into the first portion 33 of the recess 32 in a direction perpendicular to the plane of extension of the side cradle member 18. Della is an information team. In his The center shaft 30 is inserted in a low direction towards the second portion 34 of the recess 32 and is centered relative thereto. In this centered bearing which forms a drive bearing, the center shaft 30 is freely rotatable relative to the recess 32 but is real-time limited to be movable in a direction perpendicular to the plane of extension of the side wall element 18. The centering of the center shaft 30 relative to the second portion 34 can take place For example, in that the diameter of the center axis 30 substantially corresponds to the diameter of the second portion 34.

The center shaft 30 is then fixed in the drive layer by the link arms which adjoins the barrel roll 21 on 6mse sides thereof are arranged hingedly against opposite side cradle elements 18. This takes place in the embodiment shown By mounting a pivot 31 through a pre-carriageed hall 35 in the side cradle element 18 and the lane arm 20. This is allowed by the center distance between the center axis 30 and the lane arranged in the lane arm 20. 12 35 corresponds to the central position between the second portion 34 of the recess 32 and the tail 35 arranged in the side wall element 18 in front.

As above, the first long side 22a of a first segment 15a is offset relatively corresponding first side cradle member 18a convex short side 28a At the same time as its opposite second long side 22b is offset relative to the opposite concave short side 28b of the side wall member and the arm projects beyond it. The displacement must be such that the center of rotation between two hook hooks 24 stacked on top of each other must coincide with the center axis 30 of the adjacent roller 21.

Now with male reference to Fig. 7, a cross section of the conveyor belt 2 is shown in connection to one side cradle 6 of the framework 3. The drive rollers 21 of the drive chain 19 are arranged to run between two stationary roller rails 36. The roller rails 36 are preferably arranged to extend along the side cradles 6 of the framework 3 and provide that the rollers 21 when the drive chain 19 is driven by that motor (see Fig. 1a) 15 which is intended for driving the conveyor belt 2.

In order to protect the drive chain 19 from the ingress of unfiltered water, it is advantageous to arrange a sealing strip 37 along the side cradle 17 of the conveyor belt 2 which in use is intended to be water against a flood of unfiltered water. Depending on the design of the filtration device and In the intended direction of the water, the sealing strip 37 can be arranged along the upper or lower side of the conveyor belt 2. In the illustrated example, the sealing strip 37 is arranged to grip around the lower edge of the side cradle element 18 on either side thereof. It will be appreciated that the sealing strip 37 may be formed in a variety of ways and that the invention should not be limited to sealing strips. 25 list design.

The description above shall be seen as an example of a possible design of segments, side cradle elements and drive chain. It will be appreciated that the cross section of the sign and the profile of the side wall elements may be formed in a variety of ways within the scope of the invention.

Furthermore, it is understood that the segments with the maintained function can be given a row different perforation patterns. 13

Claims (8)

Patent claims A filtration device (1) for separating solid particles and other objects from water, which device comprises a conveyor belt (2) arranged to run in a closed path through a water flood, which conveyor belt (2) comprises inboard hinged perforated segments (15), each segment (15) having a first long side (22a) and a second long side (22b) opposite said first long side, which long sides (22a, 22b) have a longitudinal extension transverse to the direction of movement of the web and two short sides facing each other ( 23) with a longitudinal extension along the direction of movement of the web, the first longitudinal side (22a) of each segment (15) comprising a hook portion (24) which is hingedly hooked into a hook portion (24) of the second long side (22b) of one of the following segment (15) kir formation of said closed bans. Filtration device according to claim 1, in which each segment (15), seen in a cross-section transverse to the longitudinal direction of the belt, has a substantially S-shaped cross-section with a web (25) extending between a first and a second hook portion (24). Filtration device according to claim 2, in which the first and the second hook portion (24) comprise a flange (27) which, seen in a manner in connection with the long side (22) of the segment (15), forms an angle (a) relative to the web (25). ) which is less than 60 degrees. Filtration device according to any preceding claim, wherein each segment (15) along its short sides (23) comprises two opposite side wall elements (18) with a longitudinal extent along the direction of movement of the web, the side wall elements (18) of two successive segments (15) together form two opposite side cradles (17) with an extension along the direction of movement of the belt, each segment (15) being arranged to extend between two successive side cradle elements (18), and wherein each segment (15) is fixedly connected to a first of two consecutive sidewall elements (18). Filtration device according to claim 4, wherein the respective side cradle element (18) comprises a water bracket (29) against the web (25) of the segment (15) for fixed connection of the web (25) of the segment (15) to the side cradle element (18). Filtration device according to claim 4 or 5, wherein the conveyor belt (2) is arranged to be propelled by a drive chain (19) cooperating with the side wall elements (18), which drive chain comprises running rollers (21) and longitudinal arms (20) extending between the running rollers to forming a closed drive chain, each side cradle element (18) comprising a recess (32) for receiving a center shaft (30) of the respective roller (21), the center shaft (30) being movable in said recess when mounting the drive chain (19). (32) has an insertion bearing in which the center shaft (30) is allowed to be guided in a direction perpendicular to the plane of extension of the side wall element (18) and a drive bearing in which the center shaft (30) is allowed to rotate freely relative to the recess (32) but has a limited the direction perpendicular to the plane of propagation of the side wall element (18). A filtration device according to claim 6, wherein the recess (32) for receiving a center shaft (30) is in the form of a long tail having a first portion (33) having a first diameter and a second path (34) having a second diameter, wherein the center shaft (30) in its thrust bearing is substantially centered relative to said second portion (34). Filtration device according to claims 6-7, in which the center shaft (30) is arranged to be retained in said drive layer by hinged joints (20) adjoining the barrel roller (21) are hingedly connected to side wall elements (18) opposite relative to the respective arm arm (20). . jot of claim 1-8 for