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BF Type Bar Screen with Rotary Rake
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Product Details

BF Type Bar Screen with Rotary Rake

Introduction >>>

 The rotary rake type bar screen, also called rainwater bar screen or opposite pickup bar screen, is a kind of large-size coarse bar screen equipment used for removal of relative big suspended solids contained in water; with capability for continuous and automatic removal of the suspended solids in water, this equipment is featured with reasonable design, simple structure, safe operation, reliable performance and high level of automation, which may be widely used at water treatment occasions with high flow rate such as municipal sewage treatment, water intake of tap water works, rainwater pumping stations and cooling water intake of the power plants etc. the design for the framework structure of the equipment considers all the advantages of the rotary type bar screen and the use of working principle different from others, that is to say, the rake teeth chain can make rotary movement before and after the bar screen; when the rake teeth moves to the side of the bar screen that faces the coming water, the rake teeth will insert the clearance between the screen bars to clean and pick up the residues from bottom-up direction; the rake teeth chain is totally enclosed to prevent access of the foreign objects, which in this way can ensure even more stable operation and performance of the equipment. For installation of the equipment, the entire machine is lifted and installed; the only work needed is to pre-embed two pieces of steel plates on the ground at both sides of the water sump featuring simple and material-saving civil works and easy installation and maintenance.





 

 Working principle >>>

 The rotary rake type bar screen is composed of framework, drive unit, drive wheel, rake chain assembly and rake teeth, residue-retaining screen bar and residue baffle etc; driven by the motor reducer, the rotary chain will make bottom-up rotary movement at the side facing the coming water; when the rake teeth shaft on the chain moves to the upstream side of the screen bar, the rake teeth will insert into the clearance between the screen bars to make bottom-up movement to pick up the screenings and drop the foreign objects retained on the screen bars into the rake, it proofs high-efficient and complete removal of the screenings; when the teeth rake moves to the top the equipment, the foreign objects will drop into the vessel or transporting vehicle by gravity and then transported away from the site.

 



Characteristics and applications >>>


 As the foreign objects may possibly get access to the drag chain to make the chain blocked, therefore, totally enclosed chain is designed, which mainly consists of chain plate, chain pin and roller. While in operation, the guide rail on the framework is used for guide of direction and the roller will move on the guide rail featuring less resistance and smooth operation.


 Stainless steel material is used for underwater rotary wheels, with the use of antiwear steel bearings, the daily maintenance for underwater parts may be avoided/


 Fixed screen bars are used for residue stopping, which features relative high anti-impact capacity and proofs no problem under relatively high water level difference.



 With advantages stated above, the rotary rake type bar screen is normally used at site with high flow rate including trash barrier at wide rivers, rainwater pumping stations, river intake or used as coarse bar screen at sewage plants etc;



 



 Outline drawing >>>


 B = Equipment width


 H = Depth of water canal




 H1 = Height of screenings outlet


 H2 = H +H1 +2000


 α = Installation angle



 



Calculation of water flow through the bar screen  >>>


Water flow through the bar screen per hour: Q = K * B *h *V *3600


Therein:



Q: Water flow through the bar screen per hour


K: Flow coefficient related to the clearance of bar screen, see list of flow coefficient


B: Width of bar screen ( unit: m)


h: Water depth (unit: m), normally considered as 1m or more than 0.3m lower than the canal depth;


V: Water flow speed through the screen, normally 0.6 -1.2m/s




 


 



Flow coefficient >>>


Clearance of bar screen (mm)

15

20

30

50

80

100

Over 100

Flow coefficient K

0.42

0.50

0.60

0.71

0.80

0.83

0.85


Note: It is suggested to use the method of interpolation to get the approximate value of the flow coefficient K of other corresponding bar clearanceδ


 



Technical parameters needed when placing order:


1. Width of water canal (equipment)          2. Depth of water canal 


3. Required height of screenings outlet       4. Clearance of rake teeth 


5. Installation angle                        6. Material of the equipment


7. Maximum water depth 


 





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