SE538191C2 - Filtering device comprising a conveyor belt provided with perforated segments - Google Patents

Abstract

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 flood. 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 opposite short sides (23) with a longitudinal extent along the direction of movement of the web. The first longitudinal 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.

Description

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 flood. 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 opposite short sides (23) with a longitudinal extent along the direction of movement of the web. The first longitudinal 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.

TECHNICAL FIELD The present invention relates to a filtration device for separating solid particles and other parentals from water.

Background Art Filtration devices are used, for example, for the separation of solid particles and other fOrernal from municipal and industrial wastewater. One type of filtering device uses a perforated conveyor belt formed by a starting number of inboard articulated perforated segments. The conveyor belt is led in an elongated closed path through a contaminated water flow whereby the particles and the objects which cannot pass the perforations are captured and can be transported away from the water flow. The waste thus collected can be separated from the conveyor belt by, 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 segments can, for example, be inboard connected with the aid of hinges which extend transversely to the direction of movement of the conveyor belt. Other solutions comprise segments 20 which along a first longitudinal side are hingedly fastened about an axis extending transversely to the direction of movement of the conveyor belt and where the opposite second longitudinal side is arranged to overlap the corresponding hinged first longitudinal side of a second adjacent segment. A typical example of such a solution is given, for example, by US2006 / 0070858. The overlap forms something resembling a maze socket that prevents particles and objects 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 extend in or across the gap between two consecutive segments. This is described, for example, in US 7,510,650.

When designing a conveyor belt, it is important to avoid unnecessary gaps. This applies to the gap between the individual segments as between 1 conveyor belt and the side cradles that open the conveyor belt along the longitudinal side cradles of the framework. Through these gaps, through the relatively high velocity of the flowing water, correspondingly large particles and molds can pass more or less unhindered and -160 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 can damage the conveyor belt as well as its drive. In the long run, this can lead to the entire filtering device stopping working.

SUMMARY OF THE INVENTION The object of the present invention is to provide a filtration 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 consecutive 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 ducts are filled by a filtration device for separating solid particles and other formaldehyde frail water.

The filtering device comprises a conveyor belt arranged to run in a closed path through a water flow, which conveyor belt comprises inboard articulated connected perforated segments, the habit 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 path two opposite short sides with a longitudinal extension along the direction of movement of the web, the first long side of a habit segment comprising a hook portion which is hingedly hooked into a hook portion of the second long side of a subsequent segment to form said closed web.

The filtration device can be used for various applications where there are requirements for the separation of particles and other vesicles. This may, for example, 2 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 the filtration of municipal or industrial wastewater. The conveyor belt is assembled to the desired length by interconnecting a desired number of perforated segments 5 which are hooked together side by side with the aid of inboard cooperating hook portions. Through the hooking, the conveyor belt obtains a surface which lacks substantially linearly continuous gaps through which particles and other objects which it is intended to separate can be inadvertently guided or stuck. This reduces the need for maintenance. Furthermore, further subsequent purification of the filtered water is facilitated in cases where the process agent demands such.

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

The hooking gives something similar to a labyrinth entry where the waste that is captured by the perforated segments during the continuous feeding of the belt in the closed path is prevented from "migrating" in through the hook joint and getting out on the back of the segments and is received by filtered water.

Furthermore, the commonly used cleaning of the conveyor belt is facilitated where the particles and the waste captured by the segment's perforations are removed with the aid of, for example, rotating brushes, razors, 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 25 according to the invention, in case the filtering device is used 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 as two successive segments during this change of direction are angled and partially open. the hook joint and thereby provides access for 30 bristles / flushing water / compressed air in the space between the long sides of the two segments. Despite the fact that the hook bandage has been partially opened up, the previously discussed gap-free labyrinth entry remains, which prevents the dirt from migrating down to the underside of the conveyor belt. In the case where the filtering device is used in a water flow which is primarily directed towards the inside of the conveyor belt, something similar to a self-cleaning takes place instead due to the inevitable movement of the inboard between the segments.

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

The first and the second chin portion may comprise a flange which, seen in an area adjacent to the long side of the segment, forms an angle relative to the waist which is less than 60 degrees. The angle has the advantage of a size morn the range 25- 15 50 degrees.

Each segment may along its short sides comprise two opposite side wall elements with a longitudinal extension along the direction of movement of the web, the side wall elements of two successive segments together forming two adjacent side walls with an extension along the direction of movement of the belt, each segment being arranged between consecutive side cradle elements, and each segment being fixedly connected to a first of two consecutive side cradle 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 a trough-shaped cross-section with a depth corresponding to the height of the side cradle elements. Furthermore, the fixed connection contributes to the rigidity of the segments so that they can withstand the pressure of flowing water. The fixed connection also reduces a gap formation between the short sides of the segments and the side cradle elements. The respective side cradle elements may comprise a water console against the segment's life for fixed connection of the segment's life 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 5 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 cooperating with the side cradle elements, which drive chain comprises running rollers and lance arms extending between the running rollers to form a closed drive chain, each side cradle element comprising a recess for receiving a center axis of the center shaft axis. mounting of the drive chain is passable in said recess between an insertion layer in which the center shaft is allowed to be carried in a direction perpendicular to the plane of extension of the side wall element and a drive layer in which the center shaft is allowed to rotate freely relative to the recess

The recess and its interaction with the center axis of the barrel roller 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 longitudinal member 20 having a first portion having a first diameter and a second portion having a second diameter, the center shaft in sift drive bearing being substantially centered relative to said second portion. Due to this type of long haul, the side cradle elements are forced to a centering relative to the drive chain, which reduces wear.

The center shaft can be arranged to be retained in said drive layer 25 in that lane arms adjacent to the barrel roller are hingedly connected to side wall elements opposite to the respective lane arm, respectively. The articulated connection is most easily allowed by a pivot pin which extends between the side cradle element and the lane arm arranged closest to the side cradle element.

In another aspect, the invention relates to the use of a filtration device as described above for separating particles and other objects from 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 inboard hinged segments.

Fig. 5 shows a partial enlargement of the hook portions of two articulated hooked segments.

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. The filtration device 1 comprises a framework 3 in which a perforated conveyor belt 2 is led in a closed path over two spaced apart 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 filtering device 1 comprises a first motor 4 which is intended to feed the conveyor belt 25 by driving the upper breaking roller (not shown).

The filtering device 1 further comprises in its upper part a second motor 5 for driving a belt cleaning device (not shown). The belt cleaning device can, for example, be constituted by a rotating brush which abuts against 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. In the embodiment shown, the respective side cradle 6 has two openings 7. It is understood that the number of openings 7 and their 6 geometry can vary. Furthermore, the gutter 3 in its upper front rock part comprises roofing plates 8 which extend between the two side cradles 6. The roofing 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 frame 3 in its shown embodiment comprises on its rear side two struts 9 which extend between the side cradles 6 for stiffening the frame 3. In the embodiment shown, the rear side of the frame 3 is thus substantially 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 part a hood 9 with a lower opening 10. The hood 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 non- showed the belt cleaning device.

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

When the dirty water hits the conveyor belt 2, particles and other waste with a size exceeding the perforations will 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 through the back of the runner 3. There is also a lateral diversion and away from the filtration device 1 through the openings 7 in the side cradles 6 of the framework 3.

Through the feeding of the conveyor belt 2 in a closed path, the particles and the waste thus separated will be led up and away from the water flow. In order to avoid that the particles and the waste are returned to the conveyor belt's return carriage, the particles and the waste are separated from the conveyor belt 2 by means of the belt cleaning device (not shown). The separated waste can be collected in an unmarked 'Karl for further destruction. Referring now to Fig. 2, another principle of a filtration device 1 is shown. formed by the perforated conveyor belt 2. For simplified illustration, 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 5 further out through openings 13 in the opposite side cradles 14 of the framework 3. In this type of filtration device, the separated waste is removed by the waste falling off the conveyor belt 2 through the mutual movement of the segments 15 and can be collected at the bottom of the filtration device 1. The principle is otherwise the same as above and is not further described.

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, [Dada the types of filtration devices described above. For the sake of understanding, Fig. 3 shows two segments 15 which have lifted up the conveyor belt 2. The conveyor belt 2 which is thus built up of a number of interconnected hingedly connected segments 15 forms a bottom surface 16. To facilitate the ash lying, the perforations of the segments 15 have been omitted.

The conveyor belt 2 is laterally delimited by two opposite, substantially continuous side cradles 17 which are 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 funnel-shaped cross section seen in one direction along the web direction (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 25 between race rollers 21. A drive chain is advantageously arranged on opposite sides of the conveyor belt 2.

Referring to Figs. 4 and 5, a cross-section of two inboard articulated segments 15 is shown schematically.

Each segment 15 has a first long side 22a and a second long side 22b opposite said first long side 22a. The long sides 22a, 22b have a longitudinal extension, see arrow B across the direction of movement of the web, see arrow A. Each 8 segment 15 further has two short sides 23 facing each other with a longitudinal extent 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 a web 25 extending between a first and a second hook portion 24. The web 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 stiffen the segments 15 to withstand the flood. Furthermore, 10 folds 26 help 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 opposite longitudinal sides 22a, 22b of the segments. In the embodiment shown, the hook portions 24 are formed in 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 α is preferably 25-50 degrees.

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

Now with a new male reference to Fig. 3, selected segments 15 along their 25 opposite short sides 23 are connected to two opposite side wall elements 18. The side wall elements 18 have a longitudinal extension along the direction of movement of the web, arrow A.

The side cradle elements 18 have 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 mutually complementary profiles which in the embodiment shown consist of a convex single-hook first short side 28a and one with this concave, 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 9 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 which extends along and on opposite sides of the closed path of the conveyor belt 25.

The respective side cradle elements 18 comprise a bracket 29 facing the web 15 of the segment 15. The bracket 29 has a profile corresponding to a part of the cross section of the web 25 of the segment 15. The bracket 29 is suitably formed by a bent profile which is welded or otherwise connected to the side cradle 10. 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, eg welding or riveting.

In the embodiment shown, each 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 side side element 18a convex short side 28a while its opposite second long side 22b is opposite the opposite concave short side 28b of the side wall element 20 and the arm projecting 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 race rollers 21 and lane arms 20 extending between the race 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 running arms 20 are rotatably connected to the central axes 30 of the running rollers 21 and hingedly connected to the side cradle elements 18 via guide 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 30 of a barrel roller 21. 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 duct profile (not shown) with a cross section having 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 bore 34 of the recess 32. The essential thing is that the center shaft 30 has a duct profile can be led in and out through the first portion 33 but which is prevented from being broken in or out through the second portion 34 in a direction perpendicular to the plane of extension of the side wall element 18.

When mounting the drive chain 19 relative to the side cradle elements 18, the end 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. This constitutes an information law. In its inserted position, the center axis 30 in the direction of the second portion 34 and 15 of the recess 32 is centered relative thereto. In this centered layer which forms a drive layer, the center axis 30 is freely rotatable relative to the recess 32 but at the same time limitedly 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 be done, for example, by the diameter of the center shaft 30 substantially corresponding to the diameter of the second portion 34.

The center shaft 30 is then fixed in the drive layer by arranging the longitudinal arms 20 adjacent to the barrel roller 21 on either side thereof hingedly to opposite side wall elements 18. and the lane arm 20. This is allowed by the fact that the center distance between the center axis 30 and the tail 35 arranged in the lane arm 20 corresponds to the center distance between the second portion 34 of the recess 32 and the tail 35 arranged in the side cradle element 18.

According to the above, the first long side 22a of a first segment 15a is offset relative to the corresponding first side wall element 18a convex short side 28a while its opposite second long side 22b is offset relative to the opposite concave short side 28b of the side wall element and thus projects beyond it. The displacement shall be such that the center of rotation between two 11 hooked hook portions 24 on each other shall coincide with the center axis 30 of the adjacent barrel roll 21.

Referring now to Fig. 7, a cross-section of the conveyor belt 2 is shown in connection with one side cradle 6 of the frame 3. The drive rollers 21 of the drive chain 19 are arranged to run between two stationary roller rails 36. and states that the roller rollers 21 when the drive chain 19 is driven by the motor (see Fig. 1a) 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, when inhaled, is intended to be water against a flood of unfiltered water. Depending on the design of the filtration device and the intended flow 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 wall element 18 on the sides 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 the design of the sealing strip.

The description above should be seen as an example of a possible design of 20 segments, side cradle elements and drive chain. It will be appreciated that the cross-section of the segments and the profile of the side wall elements may be formed in a variety of ways within the scope of the invention.

Furthermore, it will be appreciated that the segments with retained function can be given a variety of perforation patterns. 12

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 articulated 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 forming the said closed path. 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 from 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, in which 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 loop rollers (21) and long arms (20) extending between the 10 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) between an insertion bearing in which the center shaft (30) is allowed to move 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). The filtration device according to claim 6, wherein the recess (32) for receiving a center axis (30) is in the form of a long tail having a first portion (33) having a first diameter and a second portion (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 running roller (21) being hingedly connected to side wall elements (18) opposite relative to the respective arm arm (20). . 14 dning according to any one of claims 1-8 for from water. 7 <6 7, 11