GB2170422A - Bar screen - Google Patents
Bar screen Download PDFInfo
- Publication number
- GB2170422A GB2170422A GB08601400A GB8601400A GB2170422A GB 2170422 A GB2170422 A GB 2170422A GB 08601400 A GB08601400 A GB 08601400A GB 8601400 A GB8601400 A GB 8601400A GB 2170422 A GB2170422 A GB 2170422A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rake
- frame
- movable
- motor
- movable frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 210000003811 finger Anatomy 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 239000011343 solid material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
A bar screen 12 in an effluent channel is cleaned by a rake 32 which is raised and lowered along a frame 22 by a drive motor 34 carried by the frame. Frame 22 is also pivotted about axis 24 by a ram, so that the frame is in position A while the rake is lifted and position B when the rake is lowered. Motor 34 drives a sprocket wheel 40 on a shaft 42, parallel to but spaced from pivot axis 24. A chain 36 is entrained over the sprocket wheel and connected to fixed framework 26 at one end and rake 32 at the other. The motor current is monitored, and the ram is controlled to withdraw the rake from the screen if it encounters an obstruction. <IMAGE>
Description
SPECIFICATION
Improvements relating to rake bar screens
This invention relates to rake bar screens for use in effluent chambers, and is of the type comprising a screen disposed in the channel, such screen comprising a plurality of bars which extend upright so that the water of the effluent can pass through the bars whilst debris and water borne solids can be caught by the bars and filtered from the water. A rake having fingers which engage between the bars is adapted to be moved upwardly of the bars thereby to sweep away the collected solid material up the bars and out of the channel. The discharged solid material is collected and disposed of clear of the channel.The present invention is concerned with the mounting arrangement for the rake, such mounting arrangement being designed so that the rake can be lowered into the channel when it is held spaced from the screen, and then moved towards the screen so that the rake fingers engage between the screen bars at the lower end of the screen, and underneath the collected solid material to be discharged from the screen. The rake is then moved upwardly as explained above so as to sweep the collected material from the screen, out of the channel and to the point of discharge.
In accordance with the present invention, the rake is mounted on a movable frame so as to be movable thereon as described above, the movable frame also mounting a drive motor for driving a transmission which effects the raising of the rake on the frame, said movable frame being pivotally mounted on a stationary frame located above the channel, and wherein the drive mechanism for raising the rake comprises a drive shaft drivingly connected to a cord or chain or the like which is connected to the rake, and said pivotal connection between the movable and stationary frames are parallel to but offset relative to said drive shaft.
This arrangement provides the advantage that the movable frame and the drive assembly can be fabricated and assembled under factory conditions, and it is only necessary to mount the movable frame on the stationary frame by establishing the said pivotal connection when on site. This simplifies erection on site which in advantageous as the site location being in an effluent environment may be unpleasant and may present difficult working conditions.
The means for moving the movable frame on the stationary frame between a rake lowering position and a rake raising position may comprise a ram, which for example could be hydraulically, electrically or pneumatically operated, connected between the frames, said ram serving to maintain the movable frame in position whilst the rake is being raised to clear the screen. The movable frame may comprise a generally flat frame with side rails in which the rake runs via suitable rollers, and in use the flat frame may lie in a plane which is at a slight angle to the vertical, as it is usual to arrange the screen at such a slight angle.
The drive assembly may comprise a motor and gear box operatively connected to the said drive shaft, the motor and gear box being supported by a suitable casing which has mountings enabling the casing to be pivotally mounted to the stationary frame.
The rake may be of conventional construction comprising a plurality of parallel fingers for engagement between the screen bars. The screen may also be of conventional construction.
The drive assembly for moving the rake on the movable frame may be adapted to drive the drive shaft which is provided with a sprocket around which a chain is trained, one end of the chain being fixed to the stationary frame, whilst the other end is connected to the rake. When the motor is driven in a first direction with the mounting frame pivoted away from the screen, the rake is lowered on the mounting frame to a lowermost position. When it reaches such position the motor is stopped which stops the movement of the rake, the mounting frame is then swung into the screen engaging position by means of the ram, and is held in such a position by the ram whilst the motor is driven in the reverse direction in order to raise the rake through the medium of the chain.The raising of the rake effects clearing of the screen as above described and the loose chain between the point of connection with the stationary frame and where the chain engages a sprocket simply hangs loose in a catenary curve. During the upward travel of the rake towards the top of its stroke it engages a rake clearing#device which sweeps the debris discharged by the rake out of the effluent channel and above the screen, into a collecting container of conventional type. the mounting frame is then pivoted to the position clear of the screen ready for the next cycle of operations. The rake may be arranged to enter the screen, between the bars thereof from either side of the screen.
It is usual to construct the various parts of frames rake and screen in metal such as steel, but the invention is not to be limited as regards the materials used.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings, wherein:
Figure l is a side view illustrating the apparatus according to the embodiment of the invention; and
Figure 2 is also a side view of the apparatus to a larger scale and showing only an upper portion of the apparatus.
Referring to the drawings, in Figure 1 there is shown a U-section effluent channel 10 in which is contained a screen 12 lying at the angle X in the channel base as shown. At the lower end of the screen 12 are parallel screen bars 14 which trap effluent carried debris as the effluent passes between the bars and along the channel as indicated by arrow 16. A rake arrangement, to be described, sweeps the collected debris from the bars 14 up the screen 12 and over a discharging edge 18 into a collecting trough 20 or other similar receptacle from whence it is disposed of in any convenient manner.
In order to clear the screen 12 as described, there is provided a screen clearing arrangement comprising a movable mounting frame 22 which is pivotally mounted at pivot point 24 on a stationary frame 26 located above the channel at ground level 28. The mounting frame 22 carries a rake 30 which has rake fingers 32 which in this example project in the direction of arrow 16 and can as shown in full lines engage between the bars 14. The rake is displaceable along the mounting frame 22 by means of a drive motor 34 and an elongated flexible member such as a chain 36 of which one end is connected to the rake 30, the other end is connected to the stationary frame 26 at location 38, and the drive member is trained round a sprocket or other pulley type wheel 40 for the displacing of same by the motor 34.A sprocket 40 is mounted on a shaft 42 which is drivingly connected to the motor 34 through a suitable transmission 44, and it will be noticed that the pivot axis 24 is separated from shaft 42 but is parallel thereto. A power operated ram 46 is operatively connected between the stationary frame 26 and the mounting frame 22 to move the mounting frame 22 between the full line position shown at A in Figure 1 and the dotted line position shown at B in Figure 1.
If reference is made to Figure 2, it will be seen that the drive shaft 42 is shown in greater detail, and is supported in bearings 48. The motor 34 and transmission 44 are supported on the mounting frame 22 so as to swing with the same when the mounting frame is pivoted about the axis 24.
The operation of the apparatus is essentially simple in that assuming the mounting frame 22 is held in the dotted line position B shown in Figure
1, when there is an accumulation of debris on the screen bars 14, the mounting frame 22 is swung to the full line position A shown in Figure 1 by means of the ram 46 which causes the fingers 32 of the rake 32 to enter between the rake bars 14 at the lower ends thereof. When the mounting frame 22 is in position, the motor 34 is driven in order to wind up the chain 36, surplus chain being allowed to hang in a natural catenary as shown in Figure 2,
until the rake 30 reaches a position where its fin
gers are engaged by a rake clearing device 50 to
displace the debris into the collecting trough 20.
When the rake has been thus cleared, the ram 46 is operated to swing the mounting frame once more to the dotted line position B. The motor is reversed to lower the rake back to the position shown in
Figure 1 in which it is ready to be moved forwards towards the screen to enable the fingers 32 once
more to enter the spaces between the screen bars
14. The ram 46 will be arranged to hold the frame
22 in the correct position in relation to the screen
12 whilst the rake moves upwardly thereof. The
rake may be of conventional construction and may
be provided with rollers which run in rails defined
in the mounting frame 22.
There may be a current sensing device or similar
device mounted in the control panel which will
sense current surge to the motor giving an indica
tion that an obstruction has been encountered.
This causes retraction of the actuator ram causing the current to drop. Dropping of the current causes the actuator ram to re-extend and re-engage the rake with the grid, giving a profiling action of the rake around the obstruction.
Claims (8)
1. A rake bar screen comprising a rake mounted on a movable frame, said rake being movable on the frame so as to be capable of being raised and lowered thereon, the movable frame also mounting a drive motor for driving a transmission which effects the raising of the rake on the frame, said movable frame being pivotally mounted on a stationary frame located above the channel, and wherein the drive mechanism for raising the rake comprises a drive shaft drivingly connected to a cord or chain or the like which is connected to the rake, and said pivotal connection between the movable and stationery frames are parallel to but offset relative to said drive shaft.
2. A rake bar screen according to Claim 1, wherein the means for moving the movable frame on the stationary frame between a rake lowering position and a rake raising position comprising a ram connected between the frames, said ram serving to maintain the movable frame in position whilst the rake is being raised to clear the screen.
3. A rake bar screen according to Claim 1 or 2, wherein the movable frame comprises a generally flat frame with side rails in which the rake runs via suitable rollers.
4. A rake bar assembly according to Claim 1, 2 or 3, wherein the drive assembly comprises a motor and gear box operatively connected to the said drive shaft, the motor and gear box being supported by a casing which has mountings enabling the casing to be pivotally mounted on the stationary frame.
5. A rake bar screen according to any preceding
Claim, wherein the drive assembly for moving the rake on the movable frame is adapted to drive the drive shaft which is provided with a sprocket around which a chain is trained, one end of the chain being fixed to the stationary frame, whilst the other end is connected to the rake.
6. A rake bar screen according to Claim 1, including a current sensing device for sensing a current surge to the motor indicating the presence of an obstruction to the rake, and means for causing retracting of the rake upon such sensing, with automatic return of the rake when it has passed the obstruction.
7. A rake bar screen comprising a rake
mounted on a movable frame, said rake being
movable on the frame so as to be capable of being
raised and lowered thereon, the movable frame also mounting a drive motor for driving a trans
mission which effects the raising of the rake on the frame, said movable frame being pivotally
mounted on a stationary frame located above the
channel, and a current surge to the motor indicat
ing the presence of an obstruction to the rake, and
means for causing retracting of the rake upon such
sensing, with automatic return of the rake when it has passed the obstruction.
8. A rake bar screen substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08601400A GB2170422B (en) | 1985-02-01 | 1986-01-21 | Improvements relating to rake bar screen installations |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858502673A GB8502673D0 (en) | 1985-02-01 | 1985-02-01 | Rake bar screens |
GB08601400A GB2170422B (en) | 1985-02-01 | 1986-01-21 | Improvements relating to rake bar screen installations |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8601400D0 GB8601400D0 (en) | 1986-02-26 |
GB2170422A true GB2170422A (en) | 1986-08-06 |
GB2170422B GB2170422B (en) | 1989-01-05 |
Family
ID=26288749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08601400A Expired GB2170422B (en) | 1985-02-01 | 1986-01-21 | Improvements relating to rake bar screen installations |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2170422B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6666977B2 (en) | 2002-01-11 | 2003-12-23 | Headworks, Inc. | Removable bar for bar screen |
US6869524B1 (en) | 2001-10-12 | 2005-03-22 | Headworks, Inc. | Scraper arm for rake screen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB563388A (en) * | 1943-02-12 | 1944-08-11 | Cyril John Hartley | Improvements in and relating to screens for sewage and other liquids |
GB1343279A (en) * | 1971-09-30 | 1974-01-10 | Longwood Eng Co Ltd | Mechanical screens for liquids |
US4218319A (en) * | 1978-02-10 | 1980-08-19 | Hans Hansson | Method and a device for automatic cleaning of trashracks at water intakes for water power plants and similar |
US4222878A (en) * | 1977-10-11 | 1980-09-16 | Hans Hansson | Raking equipment for trashracks |
-
1986
- 1986-01-21 GB GB08601400A patent/GB2170422B/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB563388A (en) * | 1943-02-12 | 1944-08-11 | Cyril John Hartley | Improvements in and relating to screens for sewage and other liquids |
GB1343279A (en) * | 1971-09-30 | 1974-01-10 | Longwood Eng Co Ltd | Mechanical screens for liquids |
US4222878A (en) * | 1977-10-11 | 1980-09-16 | Hans Hansson | Raking equipment for trashracks |
US4218319A (en) * | 1978-02-10 | 1980-08-19 | Hans Hansson | Method and a device for automatic cleaning of trashracks at water intakes for water power plants and similar |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6869524B1 (en) | 2001-10-12 | 2005-03-22 | Headworks, Inc. | Scraper arm for rake screen |
US6666977B2 (en) | 2002-01-11 | 2003-12-23 | Headworks, Inc. | Removable bar for bar screen |
Also Published As
Publication number | Publication date |
---|---|
GB8601400D0 (en) | 1986-02-26 |
GB2170422B (en) | 1989-01-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940121 |