CA1064405A - Rake for cleaning bar screens in water courses - Google Patents
Rake for cleaning bar screens in water coursesInfo
- Publication number
- CA1064405A CA1064405A CA213,050A CA213050A CA1064405A CA 1064405 A CA1064405 A CA 1064405A CA 213050 A CA213050 A CA 213050A CA 1064405 A CA1064405 A CA 1064405A
- Authority
- CA
- Canada
- Prior art keywords
- rake
- bar screen
- guide path
- guide
- leg
- 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.)
- Expired
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
Abstract
ABSTRACT
Counterflow rake for separating solid substances from channels and runs conducting liquid, especially from water and drainage channels canals. A rake comb is swingable in a counterflow direction to comb the rake on its guided upward travel. On its downward travel, the rake comb is swung outwardly of the rake by guide means. At the bottom of its descent, the rake swings in the counterflow direction for repeated rake combing. The means for guiding up and down travel of the comb consists of a looped passageway.
Counterflow rake for separating solid substances from channels and runs conducting liquid, especially from water and drainage channels canals. A rake comb is swingable in a counterflow direction to comb the rake on its guided upward travel. On its downward travel, the rake comb is swung outwardly of the rake by guide means. At the bottom of its descent, the rake swings in the counterflow direction for repeated rake combing. The means for guiding up and down travel of the comb consists of a looped passageway.
Description
Field of the Invention _ _ This invention relates to rakes for bar screens used to separate solid substances from liquid conducting channels and runs, especially from water and sewage drainage canals.
Background of the Invention There are known bar screens especially in water courses and drainage canals in the form of vertically or inclined standing spaced-apart bars. These bars, in order not to impair the flow of water or sewage, have to be cleaned. This is done by hand or by means of rakes moved up and down by machinery, which strip off in an upward direction solid substances collected on the bar screen.
In particular, the known cleaning rakes engage the bar screen from the rear, therefore in a counterflow direction.
A complicated and expensive mechanism is used to move the rake from the rear and on the bottom of the bar screen, up more or less perpendicular and free the rake laden with solid substances after emergence from the bar screen - 20 It is an ob]ect of the present invention to overcome these problems by providing a simple mechanism for a cleaning rake used with a bar screen. The motion of the rake is up and down in such a manner that the rake bypasses the . bar screen on descent and extends through the bar screen and - 25 moves upwardly from the bar screen removing trapped ,.
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material therefrom.
The bar screen may consist of individual metal bars arranged in spaced-apart manner. The bars are secured at their bottom to a carrier or fixed in the bottom of the water or sewage canal bed, for example, embedded in concrete.
Summar~ of the Invention According to an aspect of the invention, the apparatus for use in cleaning a bar screen comprises a vertically standing main frame along which a support frame is adapted to be power driven upwardly and downwardly. A rake means is swingably mounted on the support frame. A guide means controls the swinging movement of the rake so that when in use, the guide means swings the rake outwardly of the bar screen to bypass it during the rake's descent. The guide means allows the rake to swing into the bar screen at the bottom of its descent in preparation for removing material collected in ~
the bar screen. The guide means also maintains the rake in ~ -the bar screen during at least the latter part of its upward travel through the bar screen and continues to guide the remaining upward movement of the rake. The guide means comprises a looped shaped guide path provided on the main frame. A roller or equivalent means is connected to the rake and adapted to be engaged at all times by the guide path. The arrangement is such that the roller, as it moves downwardly along a first leg of the guide path and as it moves upwardly .
along a second leg of the guide path, maintains control on the rake's movement and position. Means is provided for transferring the roller from the second leg of the guide path to the first leg preparatory to resumed downward rake movement for subsequent bar screen cleaning.
The guide means in controlling the swinging movement of the rake does not force the rake through or into the bar screen at the bottom of its descent. Instead it allows the rake to swing towards the bar screen. According to a preferred aspect of the invention, the rake may be biased by means which urges the rake at all times towards a bar screen cleaning position. However, as the rake moves upwardly, the guide means is such to positively force the rake into the bar screen so that during at least the latter part of its upward travel through the bar screen, the - rake is in position to clean the upper portion thereof.
This arrangement ensures a fail safe mechanism to protect the apparatus so that should rocks or heavy immovable objects collect at the bottom of the bar screen, the machine will not be damaged in attempting to force the rake against - rocks and the like. Instead the rake is only positively forced into the bar screen at a level at which it is not expected to encounter heavy immovable objects.
BRIEF DESCRIPTION_OF THE DRAWINGS
Figure 1 shows a schematic side view of a preferred 1, .~
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embodiment of the invention;
Figure 2 is a cross-section through the apparatus of Figure l; and Figure 3 is a view of the flow direction of the apparatus according to the preferred embodiment of Figure 1.
Detailed Description of the Preferred Embodiments of the Invention As is evident from Figure 1, the rake for clearing a bar screen in a waste waterway comprises a main frame 10, which has a square cross section and the width of which corresponds to the width of the waste waterway canal 11. The frame 10 contains lateral U-shaped guides or channels which are connected among one another by braces.
On each side there are arranged two U-shaped guides 14 and . 15 16. The guides 14 on each side of the frame 10 serve for the lifting guidance of the carriage 18, which is of T-shaped form, namely a horizontal part 20 and a vertical part 22 fastened to it with upper guide rollers 26 and lower guide rollers 28. The lifting movement of the carriage is accomplished through an electric drive motor 30 driving over gear 32 and gear pinion 34 which meshes with a gear rack :
36, which, on its part, is secured in the frame 10. If, therefore, the motor 30 is running and the gear pinion 34 is turning slowly through the gear, the carriage 18 is moved up and down in the frame 10. A tipping of the carriage _4_ ~06440S
in the guides 14 is prevented by the separately lying guide rollers 26 and 28. On the upper part 20 of the lifting carriage 18 there is swingably suspended at 38 the rake 40, which, on its part, is fastened to rods 42. The rods 42 carry on their outward-lying sides guide rollers 44 which run in the guides 26. The guides 16 on both sides of the rake contain a guide path switch or deflector plate 48, which leads the rollers 44 into branching guides 16'. At first it leads off at an angle from the guide 16, then to run in a further part 16'i parallel to the guide 16 and finally, in the lower zone, where the carriage 18 has reached its lowest position, to issue again into the guide 16. This entry is designated 16"'.
At 50 there is represented a stripping device which frees the rake comb of the matter as the rake moves towards its uppermost position. The stripped matter is delivered into a lower-lying conveyance device or into a container.
The bar screen has grate bars 52 which are closely spaced-apart. They are, for example, flat or sheet metal, which are fastened only at their lower end ; in the channel floor 54 by concreting in (embedding in - concrete) or which are fastened to a part of the frame 10 running parallel to the canal floor, so that the rake and the frame 10 form a unit with the rake movable into the bar screen.
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1(i 64405 The transversely running part of the frame 10 carrying the grate bars 52 can, of course, be arranged in such a way that it lies with its upper surface in a plane - with the surface of the canal bottom, for which purpose there can be formed a corresponding recess in the canal bottom. The guides 14, 16, 16' and 16" are preferably U-shaped steel profiles, which, for protection against corrosion, can be zinc coated and which are joined in their relative positions to one another by braces and with which the frame 10 inclusive of the arrangements mounted in it, such as carriage 18, gear rack 36, is joined with the canal ~ or a corresponding device conducting a liquid. The guide rollers 26, 28 and 44 can be made of metal, but also of a suitable plastic.
Between the carriage 18 and the rods 42, which are swingably borne at 30 and carry on their other ends the rake 40, there are carried preferably one or more weights 23 and shock absorbers 56, whose function will be explained ~-j in the manner of functioning described in the following. ;
Instead of the weights there can also be used springs.
~ 20 Between the guides 16 and 16", there is formed a ; sloping surface 12 on both sides of the counterflow rake, which presents a guide or slide block for the two guide . . .
rollers 44 on the rake rods 42 of the rake arm. When the rake moves downward in the direction of arrow 60 in the guides 16' and 16", it will come to a point at which the ':
', ' : . . ~ ', .;'. ' ': .
1~64~05 guide rollers 44 have just passed the points 19. At this point, the points of the teeth of the rake 40 will lie closely behind the rake grate bars 22. If there is a resistance to the rake teeth projecting through the bars which cannot be overcome by the force provided by weights 23, on upward movement of the carriage 18 (Fig. 2) with rods 42 suspended on it, the teeth of rake 40 are positively moved through the bar screen by rollers 44 engaging surface 12. The teeth of the rake 40 are pressed from behind between the grate bars 52 and thus remove adherent matter from the grate bars. From this it is evident, therefore, that virtually under all conditions there is assured a fault-less cleaning of the grate and thereby a faultless flow of the water or sewage.
Should there be a power failure, so that automatic ope-ration cannot take place, or storm flowsof waste waters, the - invention provides that some of the grate bars, for example,every other or every third or in each case two adjacent ones,are shortened by a quarter to a half of their length, so that above these shortenings the remaining rake grate bars 52 have a greater spacing from one another than the remaining lower por-tions of the bars. It is easy to perceive that in the event - of a clogging of the grate, or the substantial storm flows, ; the water or sewage rises in the trench, but a flooding of the installation or of the environment cannot occur, because, ~ .
. ' ' ~ .
on account of the greater flow widths in the upper part of the rake grate solid substances are carried along and cannot stop up the grate. In this manner, therefore, a so-called emergency flow gutter is provided, which in the known installations had to be created by an addition of a channel-type gutter surrounding the rake grate at relatively high costs. Those emergency gutters conducted the flow of water when it reached a predetermined level caused by the clogged screen.
It is understood that the rake can be acted on by springs instead of weights 23 or in combination therewith ; in such a way that the spring causes the rake to move in the direction toward the rake.
It is also understood that other than guide rollers other devices may be used which cooperate with the guide paths to effect the correct movements of the rake.
Preferrably this drive device is an electric drive which drives a strongly reduced pinion which meshes with a gear rack which is secured in a lattice-form frame 10 which carries the lateral guides for the carriage carrying the guide rollers of the carriage carrying the rake.
The width of the rake corresponds to the width of the bar screen to be cleaned, which in turn, normally corresponds .
, ' . ~ " ~
10 6 ~40 5 to the width of the water or sewage canal. The frame with the guide track lies immediately outside the channel bed or the spacing of oppositely lying guide tracks of the frame corresponds to the width of the canal. The frame can form a unit together with the rake and be installed in the canal already present.
It is also possible, however, to construct the frame along with carriage and cleaning rake by themselves and then to install it subsequently in a corresponding place behind a bar screen of a canal. The formation is made there in such a way that the entire frame, inclusive of ; carriage and cleaning rake is removable or changeable, which is advantageous for the maintenance and repair.
The manner of functioning of the rake is as follows:
It is to be assumed that the carriage is in the upper position shown in Fig. 1 and the grate 52 is to be freed of previously accumulated solid substances. For this : purpose, current is supplied to the motor 30, so that the ; pinion 34 turns in such a way that the carriage moves down-ward in the direction of the arrow 60. In the process the guide rollers 44 on both sides of the comb 40 in their oppositely lying guides 16 come in contact with the switches 48, which likewise are contained on both sides in the guides 16 and which occupy the position'shown in Fig. 1, so that now the rollers 44 are deflected inward. In the .
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process, rods 42 swing on their pivot points 38 and carry along the rake comb 40 inward, in which process the weights 23 are raised. In further downward movement of the lift carriage 18 finally the guide rollers 44 of the rake run in the guide 16", which runs parallel to guide 16 at a distance from this, in downward direction, in which position the front points of the rake 40 lie far behind the grate bars 52. At the lower end of the down-ward movement of the carriage 18, which is represented again in Fig.l, partly in the lower position, by broken lines, the guide rollers 44 move out of the guide 16" into an entry 16"'.
In one embodiment of the lift carriage 18 with the rake 40 suspended on it, there are fastened to the rods 42 arms 21 on whose free ends there are suspeneded weights 23.
In such an embodiment these weights swing the rods 42 and the rake 40 in the direction toward the bar screen as soon as the rollers 44 have passed the point 19. Under the influence of the weights then teeth or prongs of rake 40 can then pass through the grate bars.
This type of movement of the arm, however, is no longer assured if it is necessary to content with solid substances in the gutter or in the water or sewage which stick between the rake bars and are to be removed only with force. In order to make possible a sure cleaning of 106440~
.
the grate, between the guides 16" of the entry 16 "', and 16 there is formed the oblique surface 12. It is so arranged that in the downward movement of the carriage 18 with the rake 40 suspended on it, the guide rollers 44 roll up onto the oblique surfaces 12 and press the rake 40 through the grate bars. Through this positive guidance of the comb, even in difficult cases, it is always possible to provide cleaning of the grate.
With the use of weights for operating the rake there takes place a swinging movement which is damped by shock absorders 56.
AEter the rake grate comb 40 has reached the lower position shown in broken lines in Fig. 1, which is indicated at 64, there takes place over suitable automatic or manual shifting devices the upward movement of the carriage 18 in the direction of the arrow 66. For this, ~ -either the gear or the motor 30 is reversed. In this upward movement, the teeth of the comb 40 slide between the grate bars 52 upward and carry along in the process the accumulated matter. In movement towards the upper position of the carriage shown in Fig. 1, a stripper 50 becomes active, which strips the matter situated on the comb 40 into a conveyance or transport device (not represented).
In the upward movement of the carriage 18, the guide rollers 44 pass under the switches 48 in the appropriate guides 16, which occupy the position shown in Fig. 1 and swing the switches or deflector plates 48, for example about a pivot point 68 and against the action of a spring to the right, so that the guide rollers 44 can run over the branch 16', which is further rendered possible through the fact that the weights 23 press the guide rollers 44 against the left flank of the guide 16.
The lifting movement of the carriage 18, as described above, can, of course, also take place in another manner.
Thus, for example, the gear rack 36 can be replaced by a threaded spindle or by a lbock and tackle and the drive ^ assembly can be mounted in fixed position, or there can be used circulating chains.
From the arrangement shown in Fig. 1 of the drawings, it can be seen that the teeth of the rake 40 project substantially beyond the bar screen 52. The purpose of this arrangement is to affect proper cleaning of the bar screen where the flow of water, with respect to Fig. 1, is from left to right. In other words, the rake moves into the bar screen at the base of its descent in a counter-flow direction. It is understood, of course, that with positioning of the bar screen 52 further to the left of rake 40, such that its teeth 40 just meet the bar screen 52 in its upward direction of travel, would permit cleaning of the bar screen with the flow of water in the channel '-- :
-from right to left with respect to Fig. 1. This would result in the rake entering the bar screen in the direction which is concurrent with the flow of waste water. There-fore, this mechanism may be used to clean bar screens whether the rake be on the upstream side or the donwstream side of the bar screen with respect to the direction of water flow. When the rake is on the upstream side of the bar screen 52, it is appreciated that the length of the teeth or prongs of the rake 40 must be such to provide sufficient spacing between the base of the rake 40 and the bars of the bar screen to accommodate the amount of material expected to be collected at the base of the bar screen.
Although various embodiments of the invention have been described herein in detail, it will be understood by those skilled in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
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Background of the Invention There are known bar screens especially in water courses and drainage canals in the form of vertically or inclined standing spaced-apart bars. These bars, in order not to impair the flow of water or sewage, have to be cleaned. This is done by hand or by means of rakes moved up and down by machinery, which strip off in an upward direction solid substances collected on the bar screen.
In particular, the known cleaning rakes engage the bar screen from the rear, therefore in a counterflow direction.
A complicated and expensive mechanism is used to move the rake from the rear and on the bottom of the bar screen, up more or less perpendicular and free the rake laden with solid substances after emergence from the bar screen - 20 It is an ob]ect of the present invention to overcome these problems by providing a simple mechanism for a cleaning rake used with a bar screen. The motion of the rake is up and down in such a manner that the rake bypasses the . bar screen on descent and extends through the bar screen and - 25 moves upwardly from the bar screen removing trapped ,.
. . .
1~64~05 ,L
material therefrom.
The bar screen may consist of individual metal bars arranged in spaced-apart manner. The bars are secured at their bottom to a carrier or fixed in the bottom of the water or sewage canal bed, for example, embedded in concrete.
Summar~ of the Invention According to an aspect of the invention, the apparatus for use in cleaning a bar screen comprises a vertically standing main frame along which a support frame is adapted to be power driven upwardly and downwardly. A rake means is swingably mounted on the support frame. A guide means controls the swinging movement of the rake so that when in use, the guide means swings the rake outwardly of the bar screen to bypass it during the rake's descent. The guide means allows the rake to swing into the bar screen at the bottom of its descent in preparation for removing material collected in ~
the bar screen. The guide means also maintains the rake in ~ -the bar screen during at least the latter part of its upward travel through the bar screen and continues to guide the remaining upward movement of the rake. The guide means comprises a looped shaped guide path provided on the main frame. A roller or equivalent means is connected to the rake and adapted to be engaged at all times by the guide path. The arrangement is such that the roller, as it moves downwardly along a first leg of the guide path and as it moves upwardly .
along a second leg of the guide path, maintains control on the rake's movement and position. Means is provided for transferring the roller from the second leg of the guide path to the first leg preparatory to resumed downward rake movement for subsequent bar screen cleaning.
The guide means in controlling the swinging movement of the rake does not force the rake through or into the bar screen at the bottom of its descent. Instead it allows the rake to swing towards the bar screen. According to a preferred aspect of the invention, the rake may be biased by means which urges the rake at all times towards a bar screen cleaning position. However, as the rake moves upwardly, the guide means is such to positively force the rake into the bar screen so that during at least the latter part of its upward travel through the bar screen, the - rake is in position to clean the upper portion thereof.
This arrangement ensures a fail safe mechanism to protect the apparatus so that should rocks or heavy immovable objects collect at the bottom of the bar screen, the machine will not be damaged in attempting to force the rake against - rocks and the like. Instead the rake is only positively forced into the bar screen at a level at which it is not expected to encounter heavy immovable objects.
BRIEF DESCRIPTION_OF THE DRAWINGS
Figure 1 shows a schematic side view of a preferred 1, .~
~L~6440~
embodiment of the invention;
Figure 2 is a cross-section through the apparatus of Figure l; and Figure 3 is a view of the flow direction of the apparatus according to the preferred embodiment of Figure 1.
Detailed Description of the Preferred Embodiments of the Invention As is evident from Figure 1, the rake for clearing a bar screen in a waste waterway comprises a main frame 10, which has a square cross section and the width of which corresponds to the width of the waste waterway canal 11. The frame 10 contains lateral U-shaped guides or channels which are connected among one another by braces.
On each side there are arranged two U-shaped guides 14 and . 15 16. The guides 14 on each side of the frame 10 serve for the lifting guidance of the carriage 18, which is of T-shaped form, namely a horizontal part 20 and a vertical part 22 fastened to it with upper guide rollers 26 and lower guide rollers 28. The lifting movement of the carriage is accomplished through an electric drive motor 30 driving over gear 32 and gear pinion 34 which meshes with a gear rack :
36, which, on its part, is secured in the frame 10. If, therefore, the motor 30 is running and the gear pinion 34 is turning slowly through the gear, the carriage 18 is moved up and down in the frame 10. A tipping of the carriage _4_ ~06440S
in the guides 14 is prevented by the separately lying guide rollers 26 and 28. On the upper part 20 of the lifting carriage 18 there is swingably suspended at 38 the rake 40, which, on its part, is fastened to rods 42. The rods 42 carry on their outward-lying sides guide rollers 44 which run in the guides 26. The guides 16 on both sides of the rake contain a guide path switch or deflector plate 48, which leads the rollers 44 into branching guides 16'. At first it leads off at an angle from the guide 16, then to run in a further part 16'i parallel to the guide 16 and finally, in the lower zone, where the carriage 18 has reached its lowest position, to issue again into the guide 16. This entry is designated 16"'.
At 50 there is represented a stripping device which frees the rake comb of the matter as the rake moves towards its uppermost position. The stripped matter is delivered into a lower-lying conveyance device or into a container.
The bar screen has grate bars 52 which are closely spaced-apart. They are, for example, flat or sheet metal, which are fastened only at their lower end ; in the channel floor 54 by concreting in (embedding in - concrete) or which are fastened to a part of the frame 10 running parallel to the canal floor, so that the rake and the frame 10 form a unit with the rake movable into the bar screen.
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. ~ ~ ,. . .
.
1(i 64405 The transversely running part of the frame 10 carrying the grate bars 52 can, of course, be arranged in such a way that it lies with its upper surface in a plane - with the surface of the canal bottom, for which purpose there can be formed a corresponding recess in the canal bottom. The guides 14, 16, 16' and 16" are preferably U-shaped steel profiles, which, for protection against corrosion, can be zinc coated and which are joined in their relative positions to one another by braces and with which the frame 10 inclusive of the arrangements mounted in it, such as carriage 18, gear rack 36, is joined with the canal ~ or a corresponding device conducting a liquid. The guide rollers 26, 28 and 44 can be made of metal, but also of a suitable plastic.
Between the carriage 18 and the rods 42, which are swingably borne at 30 and carry on their other ends the rake 40, there are carried preferably one or more weights 23 and shock absorbers 56, whose function will be explained ~-j in the manner of functioning described in the following. ;
Instead of the weights there can also be used springs.
~ 20 Between the guides 16 and 16", there is formed a ; sloping surface 12 on both sides of the counterflow rake, which presents a guide or slide block for the two guide . . .
rollers 44 on the rake rods 42 of the rake arm. When the rake moves downward in the direction of arrow 60 in the guides 16' and 16", it will come to a point at which the ':
', ' : . . ~ ', .;'. ' ': .
1~64~05 guide rollers 44 have just passed the points 19. At this point, the points of the teeth of the rake 40 will lie closely behind the rake grate bars 22. If there is a resistance to the rake teeth projecting through the bars which cannot be overcome by the force provided by weights 23, on upward movement of the carriage 18 (Fig. 2) with rods 42 suspended on it, the teeth of rake 40 are positively moved through the bar screen by rollers 44 engaging surface 12. The teeth of the rake 40 are pressed from behind between the grate bars 52 and thus remove adherent matter from the grate bars. From this it is evident, therefore, that virtually under all conditions there is assured a fault-less cleaning of the grate and thereby a faultless flow of the water or sewage.
Should there be a power failure, so that automatic ope-ration cannot take place, or storm flowsof waste waters, the - invention provides that some of the grate bars, for example,every other or every third or in each case two adjacent ones,are shortened by a quarter to a half of their length, so that above these shortenings the remaining rake grate bars 52 have a greater spacing from one another than the remaining lower por-tions of the bars. It is easy to perceive that in the event - of a clogging of the grate, or the substantial storm flows, ; the water or sewage rises in the trench, but a flooding of the installation or of the environment cannot occur, because, ~ .
. ' ' ~ .
on account of the greater flow widths in the upper part of the rake grate solid substances are carried along and cannot stop up the grate. In this manner, therefore, a so-called emergency flow gutter is provided, which in the known installations had to be created by an addition of a channel-type gutter surrounding the rake grate at relatively high costs. Those emergency gutters conducted the flow of water when it reached a predetermined level caused by the clogged screen.
It is understood that the rake can be acted on by springs instead of weights 23 or in combination therewith ; in such a way that the spring causes the rake to move in the direction toward the rake.
It is also understood that other than guide rollers other devices may be used which cooperate with the guide paths to effect the correct movements of the rake.
Preferrably this drive device is an electric drive which drives a strongly reduced pinion which meshes with a gear rack which is secured in a lattice-form frame 10 which carries the lateral guides for the carriage carrying the guide rollers of the carriage carrying the rake.
The width of the rake corresponds to the width of the bar screen to be cleaned, which in turn, normally corresponds .
, ' . ~ " ~
10 6 ~40 5 to the width of the water or sewage canal. The frame with the guide track lies immediately outside the channel bed or the spacing of oppositely lying guide tracks of the frame corresponds to the width of the canal. The frame can form a unit together with the rake and be installed in the canal already present.
It is also possible, however, to construct the frame along with carriage and cleaning rake by themselves and then to install it subsequently in a corresponding place behind a bar screen of a canal. The formation is made there in such a way that the entire frame, inclusive of ; carriage and cleaning rake is removable or changeable, which is advantageous for the maintenance and repair.
The manner of functioning of the rake is as follows:
It is to be assumed that the carriage is in the upper position shown in Fig. 1 and the grate 52 is to be freed of previously accumulated solid substances. For this : purpose, current is supplied to the motor 30, so that the ; pinion 34 turns in such a way that the carriage moves down-ward in the direction of the arrow 60. In the process the guide rollers 44 on both sides of the comb 40 in their oppositely lying guides 16 come in contact with the switches 48, which likewise are contained on both sides in the guides 16 and which occupy the position'shown in Fig. 1, so that now the rollers 44 are deflected inward. In the .
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process, rods 42 swing on their pivot points 38 and carry along the rake comb 40 inward, in which process the weights 23 are raised. In further downward movement of the lift carriage 18 finally the guide rollers 44 of the rake run in the guide 16", which runs parallel to guide 16 at a distance from this, in downward direction, in which position the front points of the rake 40 lie far behind the grate bars 52. At the lower end of the down-ward movement of the carriage 18, which is represented again in Fig.l, partly in the lower position, by broken lines, the guide rollers 44 move out of the guide 16" into an entry 16"'.
In one embodiment of the lift carriage 18 with the rake 40 suspended on it, there are fastened to the rods 42 arms 21 on whose free ends there are suspeneded weights 23.
In such an embodiment these weights swing the rods 42 and the rake 40 in the direction toward the bar screen as soon as the rollers 44 have passed the point 19. Under the influence of the weights then teeth or prongs of rake 40 can then pass through the grate bars.
This type of movement of the arm, however, is no longer assured if it is necessary to content with solid substances in the gutter or in the water or sewage which stick between the rake bars and are to be removed only with force. In order to make possible a sure cleaning of 106440~
.
the grate, between the guides 16" of the entry 16 "', and 16 there is formed the oblique surface 12. It is so arranged that in the downward movement of the carriage 18 with the rake 40 suspended on it, the guide rollers 44 roll up onto the oblique surfaces 12 and press the rake 40 through the grate bars. Through this positive guidance of the comb, even in difficult cases, it is always possible to provide cleaning of the grate.
With the use of weights for operating the rake there takes place a swinging movement which is damped by shock absorders 56.
AEter the rake grate comb 40 has reached the lower position shown in broken lines in Fig. 1, which is indicated at 64, there takes place over suitable automatic or manual shifting devices the upward movement of the carriage 18 in the direction of the arrow 66. For this, ~ -either the gear or the motor 30 is reversed. In this upward movement, the teeth of the comb 40 slide between the grate bars 52 upward and carry along in the process the accumulated matter. In movement towards the upper position of the carriage shown in Fig. 1, a stripper 50 becomes active, which strips the matter situated on the comb 40 into a conveyance or transport device (not represented).
In the upward movement of the carriage 18, the guide rollers 44 pass under the switches 48 in the appropriate guides 16, which occupy the position shown in Fig. 1 and swing the switches or deflector plates 48, for example about a pivot point 68 and against the action of a spring to the right, so that the guide rollers 44 can run over the branch 16', which is further rendered possible through the fact that the weights 23 press the guide rollers 44 against the left flank of the guide 16.
The lifting movement of the carriage 18, as described above, can, of course, also take place in another manner.
Thus, for example, the gear rack 36 can be replaced by a threaded spindle or by a lbock and tackle and the drive ^ assembly can be mounted in fixed position, or there can be used circulating chains.
From the arrangement shown in Fig. 1 of the drawings, it can be seen that the teeth of the rake 40 project substantially beyond the bar screen 52. The purpose of this arrangement is to affect proper cleaning of the bar screen where the flow of water, with respect to Fig. 1, is from left to right. In other words, the rake moves into the bar screen at the base of its descent in a counter-flow direction. It is understood, of course, that with positioning of the bar screen 52 further to the left of rake 40, such that its teeth 40 just meet the bar screen 52 in its upward direction of travel, would permit cleaning of the bar screen with the flow of water in the channel '-- :
-from right to left with respect to Fig. 1. This would result in the rake entering the bar screen in the direction which is concurrent with the flow of waste water. There-fore, this mechanism may be used to clean bar screens whether the rake be on the upstream side or the donwstream side of the bar screen with respect to the direction of water flow. When the rake is on the upstream side of the bar screen 52, it is appreciated that the length of the teeth or prongs of the rake 40 must be such to provide sufficient spacing between the base of the rake 40 and the bars of the bar screen to accommodate the amount of material expected to be collected at the base of the bar screen.
Although various embodiments of the invention have been described herein in detail, it will be understood by those skilled in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
....
, "
. ' ' ,
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for use in cleaning a bar screen having a plurality of upstanding spaced-apart bars in a waste water conducting canal, said apparatus comprising a vertically standing main frame along which a support frame is adapted to be power driven upwardly and downwardly, a rake means being swingably mounted on said support frame, a lateral guide means controlling the swinging movement of said rake so that, when in use, said guide means swings said rake outwardly of and downstream of such bar screen to bypass it during the rake's descent, forces the rake to swing into a bar screen on its upward travel through the bar screen and continues to guide the remaining upward movement of said rake, said guide means comprising a looped-shaped guide path provided on said main frame and a roller means connected to said rake and adapted to be engaged at all times by said guide path, the arrangement being such that said roller means as it moves downwardly along a first leg of said guide path and as it moves along a return leg of said guide path maintains said control on the rake's swinging movement, and means for transferring said roller means from said return leg of the guide path to said first leg preparatory to resumed downward rake movement.
2. An apparatus of claim 1 wherein said rake comprises a plurality of prongs of a spacing adapted to fit between bars of a bar screen when in use, said rake having an arm member secured to the prong arrangement and its other end pivotally attached to said support frame to provide for the swinging movement of said rake, said roller means being a roller mounted on said arm.
3. An apparatus of claim 1 wherein the upper portion of said guide path has a deflector plate overlying said second leg of the guide path, which is deflected from its rest position in allowing said roller means to raise above it as said rake moves upwardly, said deflector plate resuming its rest position thereby transferring said roller to said first leg of the guide path on downward movement of the rake.
4. An apparatus of claim 1 wherein the lower region of said guide path includes a portion which on engaging said roller means positively swings said rake when in use into a bar screen at a level intermediate a bar screen's height.
5. An apparatus of claims 1 or 2 wherein means urges said rake at all times to swing towards a bar screen cleaning position.
6. An apparatus of claims 1, 2 or 3 wherein said second leg of said guide path is straight.
7. An apparatus of claims 1, 2 or 3 wherein a stripping device is provided to strip raked material from said rake during its upward movement.
8. An apparatus of claims 1, 2 or 3 wherein a drive means is mounted on said support frame which powers said support frame in its upward and downward movement along said main frame.
9. An apparatus of claim 2 wherein a weight is cantilever mounted on said arm to constantly urge said rake towards a bar screen cleaning position.
10. An apparatus of claim 9 wherein a shock absorber interconnects said weight and support frame to dampen the swinging movement of said rake towards said bar screen at the bottom of the rake's descent.
11. An apparatus of claim 4 wherein said guide path consists of a channel member, said roller means being a roller engaging either leg of said channel during up and down movement of said support frame.
12. An apparatus of claim 11 wherein two spaced-apart arms are connected to said prong arrangement and such arms are pivotally connected to said support frame, one of said guide paths provided on each side of said apparatus whereby said roller on each arm engages a corresponding guide path.
13. An apparatus of claim 2 wherein the major length of said prongs project beyond said bars whereby said rake is positioned downstream of said bar screen in the direction of waste water flow.
14. An apparatus of claims 1, 2 or 4 wherein said bar screen is secured to said standing main frame, some of said bars being approximately one quarter to one-half the length of the tallest bars.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732356801 DE2356801C3 (en) | 1973-11-14 | 1973-11-14 | Countercurrent screen for separating solids from channels or watercourses carrying liquids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1064405A true CA1064405A (en) | 1979-10-16 |
Family
ID=5898073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA213,050A Expired CA1064405A (en) | 1973-11-14 | 1974-11-05 | Rake for cleaning bar screens in water courses |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1064405A (en) |
| DE (1) | DE2356801C3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2625979C3 (en) * | 1976-06-10 | 1984-02-02 | Altmeyer, Hans J. | Method and device for removing the screenings from a screen in a water channel |
| DE3536587A1 (en) * | 1985-10-14 | 1987-04-23 | Kahl Hugo | Device for eliminating the screenings collecting in front of a screen through which flow has occurred |
-
1973
- 1973-11-14 DE DE19732356801 patent/DE2356801C3/en not_active Expired
-
1974
- 1974-11-05 CA CA213,050A patent/CA1064405A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2356801B2 (en) | 1979-08-30 |
| DE2356801A1 (en) | 1975-05-28 |
| DE2356801C3 (en) | 1980-05-14 |
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