LK-GS Automatic Bar Screen

 

 

• Automatic cleaning:The motor-driven rake travels across the working face of the bar rack, lifts the screenings and releases them at the discharge point. Once commissioned, the normal cleaning cycle does not require an operator at the channel.

• Continuous-duty design: Cleaning intervals can be adjusted to suit the debris load. If the rake meets an obstruction, the overload protection can stop or reverse the drive before the unit attempts the cycle again.

• Straightforward maintenance: An enclosed upper section helps contain moving parts and keeps the working area tidier. Routine checks focus on the drive, chain tension, rake assembly and lubrication points. An automatic lubrication option is available where required.

• PLC control: The standard control cabinet supports timed operation and differential-level control. Operating status and alarms can be viewed on the HMI, and dry contacts can be provided for connection to a plant PLC or SCADA system.

• Flexible discharge arrangement: Screenings normally fall through an inclined chute into a bin. Where the layout requires it, the screen can discharge to a shaftless screw conveyor, belt conveyor or screenings compactor. Chute height and discharge direction are confirmed during equipment selection.

• Materials for the water conditions: Wetted components can be supplied in SS304 or SS316. Duplex stainless steel can be considered for more demanding wastewater. Final material selection should be based on chloride level, pH, temperature and the expected contaminants.

  

 

The Automatic Bar Screen cleans itself in a continuous, automatic loop – no manual labor needed.

Interception Stage: Preliminary Solid-Liquid Separation

1. Interception Stage: Preliminary Solid-Liquid Separation

• Bar screen filtration: Wastewater passes through parallel metallic bars (with clear spacings ranging from 5 mm to 100 mm). Solid impurities larger than the bar spacing (e.g., plastic bags, branches, rocks, etc.) are retained in the upstream zone of the screen.Trigger – The control cabinet launches a cleaning cycle on a timer, or whenever the water level difference signals a buildup.

• Flow direction design: The bars are typically installed at an angle of 60° to 90° relative to the flow direction. The hydraulic impact of the flow allows smaller particles to pass through the openings, while larger particles are intercepted due to inertial collision against the bars.

 

2.Cleaning Stage: Automatic Removal of Intercepted Materials

• Rake-tooth / scraper cleaning:

• Chain‑driven bar screen: The rake‑tooth chain rotates in the direction opposite to the flow. As the rake teeth pass through the bar spacings, they lift attached debris to the top of the screen, where it is flushed and discharged into a waste hopper.

• Rotary bar screen: A continuously rotating rake‑tooth chain strips the intercepted solids from the bars, and the debris is collected by a screw conveyor at the bottom.

• Gravity‑assisted self‑cleaning: In certain step‑type bar screens, the combined action of water scouring and the inclined screen surface allows debris to slide naturally into a collection area.

 

3.Conveyance Stage: Debris Disposal and Effluent Diversion

• Debris conveying system: The separated solids are transferred to the waste treatment area via belt conveyors, screw conveyors, or grab buckets.

• Effluent diversion: The screened wastewater is directed to subsequent treatment units (e.g., grit chambers, biological reactors) to prevent clogging of pipelines or damage to pumps by residual solids.

Built-in overload protection reverses the rake if it encounters a jam, then retries. Cycle timing, intervals, and remote monitoring are all managed from the PLC control cabinet. This simple, rugged cycle keeps the Automatic Bar Screen running unattended – delivering reliable self-cleaning, continuous operation, and drastically lower maintenance.

 

 

 

 

Model	Frame width	Tank width	Hydraulic Efficiency				Moter KW
			Bar Space				Tank depth
			3mm	5mm	10mm	15mm	1.5(m)~5(m)~7.5(m)
LK-GS400	300	400	0.27	0.36	0.48	0.54	0.37	0.37
LK-GS500	400	500					0.37	0.55
LK-GS600	500	600					0.55	0.55
LK-GS700	600	700					0.55	0.55
LK-GS800	700	800					0.55	0.75
LK-GS900	800	900					0.75	0.75
LK-GS1000	900	1000					0.75	1.1
LK-GS1100	1000	1100					1.1	1.1
LK-GS1200	1100	1200					1.1	1.1
LK-GS1300	1200	1300					1.1	1.5
LK-GS1400	1300	1400					1.5	1.5
LK-GS1500	1400	1500					1.5	1.5
a)Driving Unit
1.The drive unit adopts the Huibang brand, with features of low noise, high efficiency and good sealing. The service life of the reducer should be over 10 years. 2.The machine adopts a shaft-mounted reducer for power transmission, and screw-type adjusting devices are fitted on both sides of the frame to equalize the tension of the drive chain. 3.The reducer bearings are well lubricated and have a service life of over 100,000 hours. The gear service factor of the reducer is ≥1.5. 4.Low-alloy steel and carburized gear,tooth surface hardness is no less than HRC58. 5.Working voltage is 380V,3 phase,50Hz,the protection grade is IP65,the rated power of the motor is 10%larger than the maximum power consumption,and the motor speed is not exceed 1500r/min.
b)Rack
1.One-piece rigid structure made of SUS 304 and structural steel,with sufficient strength and rigidity. No distortion occurs under the condition of 1.0m water level difference. 2.The rubber seals on both sides of the rack are used to prevent rubbish from passing the gap between the rack and the tank wall.
c)Traction chain and sprocket
The underwater guide rollers are reliable to prevent entanglement of dirt,such as grid slag.
d)Cleaning bar
1.304 SUS material,the tooth-shaped structure meets smooth unloading,and the returning bar after unloading is free of dirt. 2.The rubber cleaning scraper is arranged for cleaning after discharging gums,and the driving of the cleaning scraper is driven by the main driving device.
e)Cover
Equipped with a closed stainless steel cover,which is openable,convenient for daily maintenance and management.

 

 

• Municipal wastewater treatment plant pretreatment  

• Water intake screening of pumping stations

• Industrial water treatment for food, beverage, slaughtering, textile and papermaking industries

• Cooling water intake filtration

• Stormwater overflow impurity interception

 

 

Each device is fully tested and delivered with a complete control cabinet. The standard configuration includes main circuit breaker, motor overload protection, preset PLC automatic operation program, and water level difference sensor access. The touch screen interface displays real-time operating status, alarm information and operation logs. Dry contact interfaces are reserved to realize remote start-stop and fault signal feedback.

 

The high-level automation design ensures stable and high-efficiency screening performance, reducing manual intervention and allowing the operation team to focus on core plant management work.

 

 

The standard arrangement uses an inclined chute to drop screenings into a collection container. For a more automated handling line, the bar screen can be supplied to work with the following equipment:

• Shaftless screw conveyor - Transfers screenings horizontally or on an incline to the next handling point.

• Screenings washing compactor - Washes and compacts the material to reduce volume and retained organic matter.

• Dewatering press - Removes additional free water before the screenings are collected for disposal.

 

The discharge height, conveyor route and available maintenance space should be reviewed together. We use the site drawing and expected solids load to propose a workable equipment arrangement.

 

 

Henan Eco Environmental Protection Equipment Co., Ltd. manufactures equipment and packaged systems for water and wastewater treatment. Our product range covers inlet screening, mixing, aeration, sludge dewatering, RO systems and complete treatment lines. We have more than 10 years of export experience and have supplied equipment for over 2,000 projects.

Customers are supported with equipment selection, drawings, production updates and commissioning guidance. Our systems are supplied to projects in the United States, Europe, Asia, South America and other markets.