US20030183563A1 - Non-metallic tooth segment and bar rack design - Google Patents
Non-metallic tooth segment and bar rack design Download PDFInfo
- Publication number
- US20030183563A1 US20030183563A1 US10/426,233 US42623303A US2003183563A1 US 20030183563 A1 US20030183563 A1 US 20030183563A1 US 42623303 A US42623303 A US 42623303A US 2003183563 A1 US2003183563 A1 US 2003183563A1
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- United States
- Prior art keywords
- bar
- teeth
- bars
- bar rack
- base portion
- 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.)
- Abandoned
Links
- 238000004140 cleaning Methods 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 239000011213 glass-filled polymer Substances 0.000 claims 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000035515 penetration Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000004727 Noryl Substances 0.000 description 2
- 229920001207 Noryl Polymers 0.000 description 2
- 229920006703 PPE+PS Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920004142 LEXAN™ Polymers 0.000 description 1
- 239000004418 Lexan Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
- B01D29/445—Bar screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
Definitions
- the invention relates to bars screens, and more particularly to bar screens having cleaning rakes.
- a bar screen generally includes a bar rack and a cleaning rake.
- the bar rack includes a series of aligned metal bars that are at least partially positioned within the channeled water.
- the cleaning rake is movably coupled to the bar rack and lifted along the length of the bar rack to periodically engage the bar rack and remove debris that has accumulated on the upstream side of the bar rack.
- the cleaning rake includes a plurality of teeth that are cantilever mounted along the length of the cleaning rake.
- the teeth are typically made from steel or cast-iron for strength.
- the general shape of the teeth is dictated by the size of the openings between adjacent bars of the bar rack, the degree that the teeth are required to penetrate into the bar rack, and the engagement clearances necessary to avoid metal to metal contact. In light of these requirements, the teeth are typically relatively long and thin.
- These prior art teeth can be easily bent if they are improperly aligned with the bar rack or if they engage debris that is trapped between the bars. Once a single tooth is bent, the entire cleaning rake cannot properly engage the bar rack, rendering the bar screen inoperable. Therefore, the bent teeth of the cleaning rake must be replaced immediately.
- the channeled water must be drained to locate the problem area that caused the damage to occur, and all of the trapped debris that has collected between the bars of the bar rack must be manually removed.
- the bar screen of the present invention decreases manufacturing costs by providing a tooth segment that can be injection molded. Injection molding achieves critical tolerances, insures repeatability of the parts, and offers a wide range of material options.
- the non-metallic tooth segment also increases the effectiveness of the bar screen by providing individual teeth that are designed to fracture such that the cleaning rake is allowed to continue functioning after a tooth or tooth segment has failed.
- the present invention also decreases maintenance and repair costs. Specifically, the cleaning rake continues to operate after a tooth fails allowing the cleaning rake to be repaired at a convenient time after the failure. Additionally, the tooth segments can be replaced individually or alternatively modules of the teeth can be replaced at significantly lower cost than when utilizing machined stainless teeth or cast-iron segments.
- the present invention is directed to a bar screen for removing debris from channeled water.
- the bar screen includes a bar rack and a cleaning rake.
- the bar rack includes a plurality of aligned bars and is adapted to be at least partially positioned within the channeled water.
- the cleaning rake is movably coupled to the bar rack and includes a plurality of tooth segments or modules.
- Each tooth segment includes a base portion and a plurality of teeth.
- the base portion is coupled to the cleaning rake, and the plurality of teeth are connected to the base portion.
- Each tooth of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack to remove debris that has accumulated on the upstream side of the bar rack.
- the teeth are breakable from the base when the teeth engage immovable debris trapped within the bar rack.
- the present invention is also directed to a tooth segment for a cleaning rake used in a bar screen.
- the bar screen includes a bar rack having a plurality of bars.
- the tooth segment includes a base portion and a plurality of teeth.
- the base portion is adapted to be coupled to the cleaning rake, and the plurality of teeth are connected to the base portion.
- Each of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack and configured to break from the base when subjected to a sufficient force.
- FIG. 1 is a side elevation view of a bar screen embodying the present invention.
- FIG. 2 is an enlarged side view of a bar rack and cleaning rake of the bar screen shown in FIG. 1.
- FIG. 3 is a rear view of the bar rack shown in FIG. 2.
- FIG. 4 is a top view of the cleaning rake shown in FIG. 2.
- FIG. 5 is an enlarged top view illustrating a portion of the cleaning rake shown in FIG. 4.
- FIG. 6 is a perspective view illustrating a tooth segment of the cleaning rake shown in FIG. 4.
- FIG. 7 is a cross-section view taken along line 7 - 7 in FIG. 2.
- FIG. 8 is a cross-section view taken along line 8 - 8 in FIG. 2.
- FIG. 9 is a cross-section view taken along line 9 - 9 in FIG. 2.
- FIG. 1 illustrates a bar screen 10 embodying the present invention.
- the bar screen 10 includes a bar rack 12 that is positioned within channeled water 14 to prevent debris from flowing past the bar rack 12 with the channeled water 14 .
- the bar screen 10 also includes a cleaning rake 16 that is coupled to a drive system 18 through a rake arm 20 .
- the drive system 18 moves the cleaning rake 16 into engagement with the bar rack 12 and along the height of the bar rack 12 to remove the trapped debris from the upstream side 22 of the bar rack 12 .
- the drive system 18 also moves the cleaning rake 16 out of engagement with the bar rack 12 and away from the bar rack 12 to dispose of the debris collected from the cleaning rake 16 .
- the drive system 18 is positioned above the channeled water 14 and supported by a foundation 24 above the channeled water 14 .
- the bar rack 12 extends above the surface 28 of the channeled water 14 from a base 26 underlying the channeled water 14 such that the bar rack 12 extends the entire depth and width of the channeled water 14 .
- the bar rack 12 is angled relative to the base 26 such that the lower end 30 of the bar rack 12 adjacent to the base 26 is positioned farther upstream than the upper end 32 of the bar rack 12 adjacent to the surface 28 of the channeled water 14 .
- the bar rack 12 includes a plurality of equally spaced elongated bars 40 that are parallel to each other.
- the bars 40 are substantially identically shaped and each include a length, a width, and a thickness.
- the lengths of the bars 40 define the height of the bar rack 12
- the widths of the bars 40 define the depth of the bar rack 12 , which is commonly about 2.5 inches.
- Gaps 42 between adjacent bars 40 of the bar rack 12 can be wider than 1 ⁇ 2 inches for coarse bar screens 10 and narrower than 1 ⁇ 2 inches for narrow bar screens 10 .
- the gaps 42 are approximately 1 ⁇ 4 or 3 ⁇ 8 inches in the narrow bar screens 10 .
- the cleaning rake 16 is shown in FIGS. 4 and 5 and includes a frame 50 and a plurality of tooth segments 52 .
- the tooth segments 52 are connected in an end to end relationship along a mounting strip 54 of the frame 50 .
- Each tooth segment 52 is substantially identically shaped and will be described in detail with reference to FIG. 6.
- the tooth segment 52 includes a base portion 56 and a plurality of teeth 58 which are cantilever mounted to a raised forward edge 60 of the base portion 56 .
- the base portion 56 is mounted to the mounting strip 54 by fasteners 62 that are inserted through the apertures 64 and into the mounting strip 54 .
- Each aperture 64 is surrounded by a raised boss 66 that is supported by a rearwardly extending rib 68 .
- the rearwardly extending ribs 68 extend from the raised bosses 66 to the rearward edge of the base 56 .
- Each tooth 58 includes a forwardly projecting flange 72 and a perpendicular carrying shelf 74 connected to the bottom of the flange 72 .
- the flange 72 includes a leading edge 76 that has a full radius which enhances the engagement of the teeth 58 with the bar rack 12 .
- the flange 72 includes a top edge 78 that has an upper notch 80 that is located adjacent to the forward edge 60 of the base 56 .
- the length of the flange 72 is dependent upon the desired tooth penetration into the bar rack 12 . Tooth penetration is defined by the length of the flange 72 compared with the width of the bars 40 .
- a flange 72 that is equal in length to the width of the bars 40 is capable of achieving 100% tooth penetration into the bar rack 12 .
- the flanges 72 shown in FIG. 5, illustrate approximately 60% tooth penetration into the bar rack 12 and are capable of at least 85% tooth penetration into the bar rack 12 .
- the flange 72 divides the carrying shelf 74 into two substantially equal first and second sides 82 , 84 .
- the carrying shelf 74 is wider than the flange 72 adjacent to the base 86 and narrows to the width of the leading edge 76 of the flange 72 .
- the first and second sides 82 , 84 of the carrying shelf 74 include first and second notches 86 , 88 , respectively, adjacent to the forward edge 60 of the base 56 .
- the tooth segments 52 are injection molded with a thermoset plastic. This type of plastic provides a rigid and strong material that allows for minor flexing during engagement with the bar rack 12 .
- the material used to manufacture the tooth segments 52 also allow the teeth 58 to fracture without significant deformation when the teeth 58 are subjected to a sufficient force. A sufficient force can be generated when a tooth 58 incorrectly aligns with the bar rack 12 or when a tooth 58 is obstructed by debris trapped between the bars 40 of the bar rack 12 during movement of the cleaning rake 16 .
- the tooth segments 52 can be molded from the following polymers manufactured by GE PLASTICS: (i) Lexan 3413R Polycarbonate, 30% glass filled; (ii) Noryl GFN2 PPE+PS, 20 glass filled; or (iii) Noryl GFN3 PPE+PS, 30% glass filled.
- the notches 80 , 86 , 88 provide the teeth 58 with a designed fracture location such that the fracture of the tooth 58 will begin to propagate and break apart from the base 56 at the location of the notches 80 , 86 , 88 .
- the fracture will begin at the location of the upper notch 80 .
- the fracture will begin at either the first or second notch 86 , 88 depending upon the direction that the tooth 58 bends.
- the drive system 18 moves the cleaning rake 16 (from the location shown in phantom lines in FIGS. 1 and 2) into engagement with the bar rack 12 .
- the teeth 58 of the tooth segments 52 are positioned within the respective gaps 42 between adjacent bars 40 of the bar rack 12 .
- the gaps 42 can be as narrow as 1 ⁇ 4 inch and the teeth 58 can achieve at least 85% tooth penetration into the bar rack 12 .
- a tooth 58 misaligns with its respective gap 42 and contacts the upstream edge of the bar 40 , the tooth 58 will bend as the cleaning rake 16 is moved into engagement with the bar rack 12 .
- the tooth 58 is allowed to bend slightly to allow minor corrections to the alignment of the tooth 58 between the bars 40 , however, the tooth 58 will fracture at either the first or second notch 86 , 88 and break off from the forward edge 60 of the base 56 when improper alignment with the bars 40 causes the tooth 58 to bend more than approximately 15 degrees.
- the bar screen 10 will continue to operate even after a tooth 58 has fractured because the tooth 58 is designed to break off completely adjacent to the forward edge 60 of the base 56 such that nothing is left of the tooth 58 to interfere with the continued operation of the bar screen 10 .
- the drive system 18 moves the cleaning rake 16 along the height of the bar rack 12 to remove all of the debris located on the upstream side 22 of the bar rack 12 .
- the configuration of the teeth 58 provides the teeth 58 with adequate strength to remove all types of debris from the bar rack 12 , the teeth 58 occasionally come into contact with trapped debris that cannot be removed from the bar rack 12 with a cleaning rake 16 . If a tooth 58 encounters any such trapped material, the tooth 58 will fracture at the upper notch 80 and completely break off from the forward edge 60 of the base 56 as the cleaning rake 16 continues to move upward to clean the bar rack 12 . Similar to the fracture discussed above, the tooth 58 completely breaks away such that nothing is left that would obstruct the operation of the bar screen 10 .
- the drive system 18 moves the cleaning rake 16 out of engagement with the bar rack 12 .
- the drive system 18 then moves the cleaning rake 16 away from the bar rack 12 and the channeled water 14 to remove the debris from the teeth 58 of the cleaning rake 16 and into a receptacle located on the foundation 24 .
- the tooth segments 52 can be replaced on the cleaning rake 16 at any convenient time because improper alignment or trapped debris does not deform the teeth 58 or cleaning rake 16 in a way that would require immediate maintenance. In addition, only the tooth segments 52 that have damaged teeth 58 are replaced as opposed to common types of cleaning rakes that require replacement of the entire cleaning rake 16 when the teeth become damaged.
- the bar rack 12 includes a bottom support plate 44 , a middle support plate 46 , and three upper support plates 48 A, 48 B, 48 C that all extend across the width of the bar rack 12 , maintain the spacing between the bars 40 of the bar rack 12 , and provide rigidity to the bar rack 12 .
- the base support plate 44 is connected to the bottom edges of the lower ends 30 of the bars 40 .
- the upper support plates 48 A, 48 B, 48 C are connected to downstream edges 98 of the upper ends 32 of the bars 40 .
- the middle support plate 46 is connected to the downstream edges 98 at the center of the bars 40 .
- the supports 44 , 46 , 48 A, 48 B, 48 C are substantially parallel with each other and are substantially perpendicular to the bars 40 of the bar rack 12 .
- the upper support plate 48 A is L-shaped in cross-section and includes an engaging face 90 that extends parallel to the bars 40 of the bar rack 12 and a mounting face 92 that extends perpendicularly away from the bars 40 of the bar rack 12 .
- the mounting face 92 includes two mounting holes 94 . Fasteners (not shown) are inserted through the mounting holes 94 and into a support frame 38 of the foundation 24 to support the upper end 32 of the bar rack 12 .
- the engaging face 90 includes-equally spaced grooves 96 that are machined into the engaging face 90 in a direction that is perpendicular to the longitudinal direction of the upper support plate 48 A.
- the grooves 96 are located across the entire engaging face 90 and are machined to a depth that is less than the width of the bars 40 .
- the upper support plate 48 A is connected to the bars 40 such that downstream edges 98 of the upper ends 32 of the bars 40 are positioned within the grooves 96 of the upper support 48 A.
- the upper support plates 48 B, 48 C and the middle support plate 46 are elongated plates that each includes a face that includes grooves 96 that are machined in a similar manner to the grooves 96 of the upper support plate 48 A.
- the upper support plates 48 B, 48 C and the middle support plate 46 are connected to the bars 40 such that the downstream edges 98 of the bars 40 are positioned within the grooves 96 of the upper support plates 48 B, 48 C and the middle support plate 46 .
- the bottom support plate 44 is an elongated plate that includes grooves 96 that are machined similar to the grooves 96 of the upper support plate 48 A except that the grooves 96 of the bottom support plate 44 are machined to a depth that is greater than the width of the bars 40 .
- the bottom support plate 44 is connected to the bars 40 such that the entire width of the lower ends 30 of the bars 40 are positioned within the grooves 96 of the bottom support plate 44 .
- the bottom support plate 44 also includes three mounting holes 100 that are used to removably connect the bar rack 12 to the base 26 .
- a sill plate 102 is fastened with grout 104 and anchors 106 to the base 26 .
- the sill plate 102 includes three upwardly projecting studs 108 that extend through the mounting holes 100 of the bottom support plate 44 to maintain the position of the lower end 30 of the bar rack 12 relative to the base 26 .
- the grooves 96 in the upper support plates 48 A, 48 B, 48 C, the middle support plate 46 , and the bottom support plate 44 are machined with tight tolerances such that when the bars are positioned in the grooves 96 of the support plates 48 A, 48 B, 48 C, 46 , 44 the bars 40 are capable of maintaining tight positional tolerances within the bar rack 12 .
- the bar rack 12 includes two angle clips 110 that are mounted to opposite ends of the upper support plates 48 A, 48 B.
- the angle clips 110 are fastened to the support frame 38 of the foundation 24 to assist the upper support plate 48 A in supporting the upper end 32 of the bar rack 12 .
Abstract
The bar screen of the present invention includes a bar rack and a cleaning rake. The bar rack includes a plurality of aligned bars and is adapted to be at least partially positioned within the channeled water. The cleaning rake is movably coupled to the bar rack and includes a plurality of tooth segments. Each tooth segment includes a base portion and a plurality of teeth. The base portion is coupled to the cleaning rake, and the plurality of teeth is connected to the base portion. Each tooth of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack to remove debris that has accumulated on the upstream side of the bar rack. The teeth are breakable from the base when the teeth engage immovable debris trapped within the bar rack.
Description
- The invention relates to bars screens, and more particularly to bar screens having cleaning rakes.
- Bar screens are used to collect debris from channeled water flowing into water treatment plants, industrial sites, drainage facilities, or overflow control facilities. A bar screen generally includes a bar rack and a cleaning rake. The bar rack includes a series of aligned metal bars that are at least partially positioned within the channeled water. The cleaning rake is movably coupled to the bar rack and lifted along the length of the bar rack to periodically engage the bar rack and remove debris that has accumulated on the upstream side of the bar rack. The cleaning rake includes a plurality of teeth that are cantilever mounted along the length of the cleaning rake.
- The teeth are typically made from steel or cast-iron for strength. The general shape of the teeth is dictated by the size of the openings between adjacent bars of the bar rack, the degree that the teeth are required to penetrate into the bar rack, and the engagement clearances necessary to avoid metal to metal contact. In light of these requirements, the teeth are typically relatively long and thin. These prior art teeth can be easily bent if they are improperly aligned with the bar rack or if they engage debris that is trapped between the bars. Once a single tooth is bent, the entire cleaning rake cannot properly engage the bar rack, rendering the bar screen inoperable. Therefore, the bent teeth of the cleaning rake must be replaced immediately. In addition, the channeled water must be drained to locate the problem area that caused the damage to occur, and all of the trapped debris that has collected between the bars of the bar rack must be manually removed.
- The bar screen of the present invention decreases manufacturing costs by providing a tooth segment that can be injection molded. Injection molding achieves critical tolerances, insures repeatability of the parts, and offers a wide range of material options. The non-metallic tooth segment also increases the effectiveness of the bar screen by providing individual teeth that are designed to fracture such that the cleaning rake is allowed to continue functioning after a tooth or tooth segment has failed. The present invention also decreases maintenance and repair costs. Specifically, the cleaning rake continues to operate after a tooth fails allowing the cleaning rake to be repaired at a convenient time after the failure. Additionally, the tooth segments can be replaced individually or alternatively modules of the teeth can be replaced at significantly lower cost than when utilizing machined stainless teeth or cast-iron segments.
- The present invention is directed to a bar screen for removing debris from channeled water. The bar screen includes a bar rack and a cleaning rake. The bar rack includes a plurality of aligned bars and is adapted to be at least partially positioned within the channeled water. The cleaning rake is movably coupled to the bar rack and includes a plurality of tooth segments or modules. Each tooth segment includes a base portion and a plurality of teeth. The base portion is coupled to the cleaning rake, and the plurality of teeth are connected to the base portion. Each tooth of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack to remove debris that has accumulated on the upstream side of the bar rack. The teeth are breakable from the base when the teeth engage immovable debris trapped within the bar rack.
- The present invention is also directed to a tooth segment for a cleaning rake used in a bar screen. The bar screen includes a bar rack having a plurality of bars. The tooth segment includes a base portion and a plurality of teeth. The base portion is adapted to be coupled to the cleaning rake, and the plurality of teeth are connected to the base portion. Each of the plurality of teeth is adapted to be inserted between adjacent bars on the bar rack and configured to break from the base when subjected to a sufficient force.
- Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
- FIG. 1 is a side elevation view of a bar screen embodying the present invention.
- FIG. 2 is an enlarged side view of a bar rack and cleaning rake of the bar screen shown in FIG. 1.
- FIG. 3 is a rear view of the bar rack shown in FIG. 2.
- FIG. 4 is a top view of the cleaning rake shown in FIG. 2.
- FIG. 5 is an enlarged top view illustrating a portion of the cleaning rake shown in FIG. 4.
- FIG. 6 is a perspective view illustrating a tooth segment of the cleaning rake shown in FIG. 4.
- FIG. 7 is a cross-section view taken along line7-7 in FIG. 2.
- FIG. 8 is a cross-section view taken along line8-8 in FIG. 2.
- FIG. 9 is a cross-section view taken along line9-9 in FIG. 2.
- Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including” and “comprising” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The use of “consisting of” and variations thereof herein is meant to encompass only the items listed thereafter. The use of letters to identify elements of a method or process is simply for identification and is not meant to indicate that the elements should be performed in a particular order.
- FIG. 1 illustrates a
bar screen 10 embodying the present invention. Thebar screen 10 includes abar rack 12 that is positioned within channeledwater 14 to prevent debris from flowing past thebar rack 12 with the channeledwater 14. Thebar screen 10 also includes acleaning rake 16 that is coupled to adrive system 18 through arake arm 20. Thedrive system 18 moves thecleaning rake 16 into engagement with thebar rack 12 and along the height of thebar rack 12 to remove the trapped debris from theupstream side 22 of thebar rack 12. Thedrive system 18 also moves thecleaning rake 16 out of engagement with thebar rack 12 and away from thebar rack 12 to dispose of the debris collected from thecleaning rake 16. Thedrive system 18 is positioned above the channeledwater 14 and supported by afoundation 24 above the channeledwater 14. - The
bar rack 12 extends above thesurface 28 of the channeledwater 14 from abase 26 underlying the channeledwater 14 such that thebar rack 12 extends the entire depth and width of the channeledwater 14. Thebar rack 12 is angled relative to thebase 26 such that thelower end 30 of thebar rack 12 adjacent to thebase 26 is positioned farther upstream than theupper end 32 of thebar rack 12 adjacent to thesurface 28 of the channeledwater 14. - As shown in FIG. 3, the
bar rack 12 includes a plurality of equally spacedelongated bars 40 that are parallel to each other. Thebars 40 are substantially identically shaped and each include a length, a width, and a thickness. The lengths of thebars 40 define the height of thebar rack 12, and the widths of thebars 40 define the depth of thebar rack 12, which is commonly about 2.5 inches. Gaps 42 betweenadjacent bars 40 of thebar rack 12 can be wider than ½ inches forcoarse bar screens 10 and narrower than ½ inches fornarrow bar screens 10. The gaps 42 are approximately ¼ or ⅜ inches in the narrow bar screens 10. - The cleaning
rake 16 is shown in FIGS. 4 and 5 and includes aframe 50 and a plurality oftooth segments 52. Thetooth segments 52 are connected in an end to end relationship along a mountingstrip 54 of theframe 50. Eachtooth segment 52 is substantially identically shaped and will be described in detail with reference to FIG. 6. - The
tooth segment 52 includes abase portion 56 and a plurality ofteeth 58 which are cantilever mounted to a raisedforward edge 60 of thebase portion 56. Thebase portion 56 is mounted to the mountingstrip 54 byfasteners 62 that are inserted through theapertures 64 and into the mountingstrip 54. Eachaperture 64 is surrounded by a raisedboss 66 that is supported by arearwardly extending rib 68. Therearwardly extending ribs 68 extend from the raisedbosses 66 to the rearward edge of thebase 56. - Each
tooth 58 includes a forwardly projectingflange 72 and aperpendicular carrying shelf 74 connected to the bottom of theflange 72. Theflange 72 includes aleading edge 76 that has a full radius which enhances the engagement of theteeth 58 with thebar rack 12. Theflange 72 includes atop edge 78 that has anupper notch 80 that is located adjacent to theforward edge 60 of thebase 56. The length of theflange 72 is dependent upon the desired tooth penetration into thebar rack 12. Tooth penetration is defined by the length of theflange 72 compared with the width of thebars 40. For example, aflange 72 that is equal in length to the width of thebars 40 is capable of achieving 100% tooth penetration into thebar rack 12. Theflanges 72 shown in FIG. 5, illustrate approximately 60% tooth penetration into thebar rack 12 and are capable of at least 85% tooth penetration into thebar rack 12. - The
flange 72 divides the carryingshelf 74 into two substantially equal first andsecond sides 82, 84. The carryingshelf 74 is wider than theflange 72 adjacent to thebase 86 and narrows to the width of the leadingedge 76 of theflange 72. The first andsecond sides 82, 84 of the carryingshelf 74 include first andsecond notches forward edge 60 of thebase 56. - The
tooth segments 52 are injection molded with a thermoset plastic. This type of plastic provides a rigid and strong material that allows for minor flexing during engagement with thebar rack 12. The material used to manufacture thetooth segments 52 also allow theteeth 58 to fracture without significant deformation when theteeth 58 are subjected to a sufficient force. A sufficient force can be generated when atooth 58 incorrectly aligns with thebar rack 12 or when atooth 58 is obstructed by debris trapped between thebars 40 of thebar rack 12 during movement of the cleaningrake 16. Specifically, thetooth segments 52 can be molded from the following polymers manufactured by GE PLASTICS: (i) Lexan 3413R Polycarbonate, 30% glass filled; (ii) Noryl GFN2 PPE+PS, 20 glass filled; or (iii) Noryl GFN3 PPE+PS, 30% glass filled. - The
notches teeth 58 with a designed fracture location such that the fracture of thetooth 58 will begin to propagate and break apart from the base 56 at the location of thenotches rake 16 is being raised to remove debris from thebar rack 12 and atooth 58 is obstructed by trapped debris, the fracture will begin at the location of theupper notch 80. Alternatively, when the cleaningrake 16 is moved into engagement with thebar rack 12 and atooth 58 incorrectly aligns with thebar rack 12, the fracture will begin at either the first orsecond notch tooth 58 bends. - During operation of the
bar screen 10, thedrive system 18 moves the cleaning rake 16 (from the location shown in phantom lines in FIGS. 1 and 2) into engagement with thebar rack 12. As shown in FIG. 5, when the cleaningrake 16 is engaged with thebar rack 12, theteeth 58 of thetooth segments 52 are positioned within the respective gaps 42 betweenadjacent bars 40 of thebar rack 12. As discussed earlier, the gaps 42 can be as narrow as ¼ inch and theteeth 58 can achieve at least 85% tooth penetration into thebar rack 12. - If a
tooth 58 misaligns with its respective gap 42 and contacts the upstream edge of thebar 40, thetooth 58 will bend as the cleaningrake 16 is moved into engagement with thebar rack 12. Thetooth 58 is allowed to bend slightly to allow minor corrections to the alignment of thetooth 58 between thebars 40, however, thetooth 58 will fracture at either the first orsecond notch forward edge 60 of the base 56 when improper alignment with thebars 40 causes thetooth 58 to bend more than approximately 15 degrees. Thebar screen 10 will continue to operate even after atooth 58 has fractured because thetooth 58 is designed to break off completely adjacent to theforward edge 60 of the base 56 such that nothing is left of thetooth 58 to interfere with the continued operation of thebar screen 10. - After the
cleaning rake 16 engages thebar rack 12, thedrive system 18 moves the cleaningrake 16 along the height of thebar rack 12 to remove all of the debris located on theupstream side 22 of thebar rack 12. Although the configuration of theteeth 58 provides theteeth 58 with adequate strength to remove all types of debris from thebar rack 12, theteeth 58 occasionally come into contact with trapped debris that cannot be removed from thebar rack 12 with a cleaningrake 16. If atooth 58 encounters any such trapped material, thetooth 58 will fracture at theupper notch 80 and completely break off from theforward edge 60 of the base 56 as the cleaningrake 16 continues to move upward to clean thebar rack 12. Similar to the fracture discussed above, thetooth 58 completely breaks away such that nothing is left that would obstruct the operation of thebar screen 10. - After the
cleaning rake 16 is swept across the entire height of thebar rack 12, thedrive system 18 moves the cleaningrake 16 out of engagement with thebar rack 12. Thedrive system 18 then moves the cleaningrake 16 away from thebar rack 12 and the channeledwater 14 to remove the debris from theteeth 58 of the cleaningrake 16 and into a receptacle located on thefoundation 24. - The
tooth segments 52 can be replaced on the cleaningrake 16 at any convenient time because improper alignment or trapped debris does not deform theteeth 58 or cleaningrake 16 in a way that would require immediate maintenance. In addition, only thetooth segments 52 that have damagedteeth 58 are replaced as opposed to common types of cleaning rakes that require replacement of theentire cleaning rake 16 when the teeth become damaged. - Referring again to FIGS. 2 and 3, the
bar rack 12 includes abottom support plate 44, amiddle support plate 46, and threeupper support plates bar rack 12, maintain the spacing between thebars 40 of thebar rack 12, and provide rigidity to thebar rack 12. Thebase support plate 44 is connected to the bottom edges of the lower ends 30 of thebars 40. Theupper support plates downstream edges 98 of the upper ends 32 of thebars 40. Themiddle support plate 46 is connected to thedownstream edges 98 at the center of thebars 40. The supports 44, 46, 48A, 48B, 48C are substantially parallel with each other and are substantially perpendicular to thebars 40 of thebar rack 12. - With further reference to FIG. 7, the
upper support plate 48A is L-shaped in cross-section and includes an engagingface 90 that extends parallel to thebars 40 of thebar rack 12 and a mountingface 92 that extends perpendicularly away from thebars 40 of thebar rack 12. The mountingface 92 includes two mounting holes 94. Fasteners (not shown) are inserted through the mounting holes 94 and into asupport frame 38 of thefoundation 24 to support theupper end 32 of thebar rack 12. The engagingface 90 includes-equally spacedgrooves 96 that are machined into the engagingface 90 in a direction that is perpendicular to the longitudinal direction of theupper support plate 48A. Thegrooves 96 are located across the entire engagingface 90 and are machined to a depth that is less than the width of thebars 40. Theupper support plate 48A is connected to thebars 40 such thatdownstream edges 98 of the upper ends 32 of thebars 40 are positioned within thegrooves 96 of theupper support 48A. - The
upper support plates middle support plate 46, as shown in FIG. 8, are elongated plates that each includes a face that includesgrooves 96 that are machined in a similar manner to thegrooves 96 of theupper support plate 48A. Theupper support plates middle support plate 46 are connected to thebars 40 such that thedownstream edges 98 of thebars 40 are positioned within thegrooves 96 of theupper support plates middle support plate 46. - As shown in FIG. 9, the
bottom support plate 44 is an elongated plate that includesgrooves 96 that are machined similar to thegrooves 96 of theupper support plate 48A except that thegrooves 96 of thebottom support plate 44 are machined to a depth that is greater than the width of thebars 40. Thebottom support plate 44 is connected to thebars 40 such that the entire width of the lower ends 30 of thebars 40 are positioned within thegrooves 96 of thebottom support plate 44. Thebottom support plate 44 also includes three mountingholes 100 that are used to removably connect thebar rack 12 to thebase 26. Asill plate 102 is fastened withgrout 104 and anchors 106 to thebase 26. Thesill plate 102 includes three upwardly projecting studs 108 that extend through the mountingholes 100 of thebottom support plate 44 to maintain the position of thelower end 30 of thebar rack 12 relative to thebase 26. - The
grooves 96 in theupper support plates middle support plate 46, and thebottom support plate 44 are machined with tight tolerances such that when the bars are positioned in thegrooves 96 of thesupport plates bars 40 are capable of maintaining tight positional tolerances within thebar rack 12. - As shown in FIGS. 1 and 2, the
bar rack 12 includes twoangle clips 110 that are mounted to opposite ends of theupper support plates support frame 38 of thefoundation 24 to assist theupper support plate 48A in supporting theupper end 32 of thebar rack 12.
Claims (31)
1. A bar screen for removing debris from channeled water, the bar screen comprising:
a bar rack including a plurality of aligned bars, the bar rack adapted to be at least partially positioned within the channeled water; and
a cleaning rake that is movably coupled to the bar rack, the cleaning rake including a plurality of tooth segments, each of the plurality of tooth segments including
a base portion coupled to the cleaning rake, and
a plurality of teeth connected to the base portion, each of the plurality of teeth adapted to be inserted between adjacent bars on the bar rack to remove debris that has accumulated on the upstream side of the bar rack, the teeth being breakable from the base when the teeth engage immovable debris trapped within the bar rack and when the teeth misalign with damaged bars.
2. The bar screen of claim 1 , wherein the plurality of teeth are cantilever-mounted to the base portion.
3. The bar screen of claim 1 , wherein the teeth are glass filled polymers.
4. The bar screen of claim 1 , wherein the plurality of tooth segments are integrally formed with the base portion.
5. The bar screen of claim 1 , wherein each of the plurality of teeth includes a notch located to initiate the fracture of such teeth when they engage trapped debris within the bar rack.
6. The bar screen of claim 5 , wherein each of the plurality of teeth include a flange that extends outwardly from the base portion and a carrying shelf, the flange being substantially perpendicular to the carrying shelf and having a notch adjacent to the base portion.
7. The bar screen of claim 6 , wherein the flange divides the carrying shelf into first and second sides, the first side including a first notch adjacent to the base portion and the second side including a second notch adjacent to the base portion.
8. The bar screen of claim 7 , wherein the flange includes a leading edge having a full radius to enhance engagement with the bar rack.
9. The bar screen of claim 8 , wherein the carrying shelf narrows as it extends outwardly from the base portion.
10. The bar screen of claim 1 , wherein the bars are spaced approximately between ¼ and ⅜ inches apart from each other.
11. The bar screen of claim 10 , wherein the bars each include a width, each of the plurality of teeth penetrating into the bar rack a distance that is at least 60% of the bar width.
12. The bar screen of claim 11 , wherein each of the plurality of teeth penetrates into the bar rack a distance that is at least 85% of the bar width.
13. A tooth segment for a cleaning rake used in a bar screen, the bar screen including a bar rack having plurality of bars, the tooth segment comprising:
a base portion adapted to be coupled to the cleaning rake, and
a plurality of teeth connected to the base portion, each of the plurality of teeth adapted to be inserted between adjacent bars on the bar rack, the plurality of teeth configured to break from the base when subjected to a sufficient lateral force.
14. The bar screen of claim 13 , wherein the plurality of teeth are cantilever-mounted to the base portion.
15. The bar screen of claim 13 , wherein the teeth are glass filled polymer.
16. The bar screen of claim 13 , wherein the plurality of tooth segments are integrally formed with the base portion.
17. The bar screen of claim 13 , wherein each of the plurality of teeth includes a notch located to initiate the fracture of such teeth when subjected to a sufficient force.
18. The bar screen of claim 17 , wherein each of the plurality of teeth include a flange that extends outwardly from the base portion and a carrying shelf, the flange being substantially perpendicular to the carrying shelf and having a notch adjacent to the base portion.
19. The bar screen of claim 18 , wherein the flange divides the carrying shelf into first and second sides, the first side including a first notch adjacent to the base portion and the second side including a second notch adjacent to the base portion.
20. The bar screen of claim 19 , wherein the flange includes a leading edge having a full radius to enhance engagement with the bar rack.
21. The bar screen of claim 20 , wherein the carrying shelf narrows as it extends outwardly from the base portion.
22. A bar rack for a bar screen that removes debris from channeled water, the bar rack comprising;
a plurality of bars,
a support plate having a plurality of grooves, the plurality of bars being connected to the support plate such that each bar of the plurality of bars is at least partially positioned within a separate one of the plurality of grooves.
23. The bar rack of claim 22 , wherein the plurality of grooves are parallel to each other.
24. The bar rack of claim 22 , wherein the plurality of bars are parallel to each other.
25. The bar rack of claim 22 , wherein the plurality of bars are equally spaced apart from each other.
26. The bar rack of claim 22 , wherein the plurality of grooves are equally spaced apart from each other.
27. The bar rack of claim 22 , wherein the plurality of bars are substantially the same size.
28. The bar rack of claim 22 , wherein the plurality of grooves are substantially the same size.
29. The bar rack of claim 22 , wherein each of the plurality of bars includes a width, and wherein each of the plurality of grooves includes a depth, the depth of each of the plurality of grooves being greater than the width of each of the plurality of bars.
30. The bar rack of claim 22 , wherein each of the plurality of bars includes a width, and wherein each of the plurality of grooves includes a depth, the depth of each of the plurality of grooves being less than the width of each of the plurality of bars.
31. The bar rack of claim 22 , wherein ends of the plurality of bars are connected to the support plate, and wherein the bar rack further comprises an additional support plate having a plurality of grooves, wherein other ends of the plurality of bars are connected to the additional support plate such that each bar of the plurality of bars is at least partially positioned within a separate one of the plurality of grooves in the additional support plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/426,233 US20030183563A1 (en) | 2001-10-11 | 2003-04-29 | Non-metallic tooth segment and bar rack design |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/975,222 US6579450B2 (en) | 2001-10-11 | 2001-10-11 | Non-metallic tooth segment and bar rack design |
US10/426,233 US20030183563A1 (en) | 2001-10-11 | 2003-04-29 | Non-metallic tooth segment and bar rack design |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/975,222 Division US6579450B2 (en) | 2001-10-11 | 2001-10-11 | Non-metallic tooth segment and bar rack design |
Publications (1)
Publication Number | Publication Date |
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US20030183563A1 true US20030183563A1 (en) | 2003-10-02 |
Family
ID=25522800
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/975,222 Expired - Fee Related US6579450B2 (en) | 2001-10-11 | 2001-10-11 | Non-metallic tooth segment and bar rack design |
US10/426,233 Abandoned US20030183563A1 (en) | 2001-10-11 | 2003-04-29 | Non-metallic tooth segment and bar rack design |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/975,222 Expired - Fee Related US6579450B2 (en) | 2001-10-11 | 2001-10-11 | Non-metallic tooth segment and bar rack design |
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US (2) | US6579450B2 (en) |
CA (1) | CA2406587A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2893862A1 (en) * | 2005-11-25 | 2007-06-01 | Beaudrey Et Cie Sa E | Filtering drum e.g. for water used in industrial processes has filter panels equipped with flaps to trap debris that can be removed by washing jets |
WO2018222985A1 (en) * | 2017-06-01 | 2018-12-06 | Parkson Corporation | Bar screen filter apparatus and method |
US20220023779A1 (en) * | 2020-07-23 | 2022-01-27 | Parkson Corporation | Bar screen filter apparatus and method |
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US7959780B2 (en) | 2004-07-26 | 2011-06-14 | Emporia Capital Funding Llc | Textured ion exchange membranes |
US7780833B2 (en) | 2005-07-26 | 2010-08-24 | John Hawkins | Electrochemical ion exchange with textured membranes and cartridge |
US20070119104A1 (en) * | 2005-09-23 | 2007-05-31 | Walter Pijanowski | Covered rain gutter system |
CN101316794B (en) | 2005-10-06 | 2016-01-06 | 派克逖克斯公司 | The electrochemical ion of fluid exchanges process |
US20090301956A1 (en) * | 2008-06-10 | 2009-12-10 | Richard Coppola | Modular debris rack |
US20160296863A1 (en) * | 2015-04-08 | 2016-10-13 | Steven Dill | Novel rake components for rake screens |
DE102015108006A1 (en) * | 2015-05-20 | 2016-11-24 | Huber Se | Apparatus for separating and removing screenings from a streaming liquid contaminated with screenings |
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---|---|---|---|---|
FR2893862A1 (en) * | 2005-11-25 | 2007-06-01 | Beaudrey Et Cie Sa E | Filtering drum e.g. for water used in industrial processes has filter panels equipped with flaps to trap debris that can be removed by washing jets |
WO2018222985A1 (en) * | 2017-06-01 | 2018-12-06 | Parkson Corporation | Bar screen filter apparatus and method |
US10889952B2 (en) * | 2017-06-01 | 2021-01-12 | Parkson Corporation | Bar screen filter apparatus and method |
US20220023779A1 (en) * | 2020-07-23 | 2022-01-27 | Parkson Corporation | Bar screen filter apparatus and method |
US11633680B2 (en) * | 2020-07-23 | 2023-04-25 | Parkson Corporation | Bar screen filter apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
US6579450B2 (en) | 2003-06-17 |
US20030070970A1 (en) | 2003-04-17 |
CA2406587A1 (en) | 2003-04-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: USFILTER CORPORATION, PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNITED STATES FILTER CORPORATION;REEL/FRAME:015204/0036 Effective date: 20040731 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |