Automatic Rotary Grille Cleaning Machine Fine and Coarse Rake type Bar Screen for Wastewater Treatment and Food Processing

Rotary Mechanical Bar Screen cleaning machine is a core pretreatment solution for modern municipal wastewater treatment plants (WWTPs). It continuously removes coarse solids and debris from incoming sewage with a rotating rake mechanism. Its high-efficiency design ensures excellent flow capacity and separation performance, reducing downstream equipment wear and processing load. Key advantages include automatic operation, low maintenance, and robust durability. This system is essential for protecting pumps and processes, ensuring stable and efficient WWTP operation while significantly lowering long-term operational costs.

Ladder grille is a water treatment equipment that can continuously and automatically intercept and clean various shapes of debris in fluids, and can be widely used in urban sewage treatment. The water supply industry, power plant inlet, and can also serve as front-end screening equipment in wastewater treatment processes for industries such as textiles, food processing, papermaking, and leather.

The stepped grille cleaning machine is mainly composed of four parts:

dynamic grille, static grille, power and transmission device, and electrical control system.

The dynamic and static grilles are arranged alternately in a zigzag shape, and the dynamic grille is driven by a transmission mechanism to perform eccentric motion, transferring dirt from one step of the static grille to the next step until it falls into the dirt receiving groove at the top of the grille.

The rotary mechanical bar screen cleaning machine is a highly efficient solid-liquid separation device widely used in wastewater treatment systems. It is designed to automatically remove debris such as leaves, plastics, fibers, and other suspended solids from water, ensuring the smooth operation of downstream treatment processes.

It is widely used for cleaning floating and suspended solids in urban sewage and industrial wastewater, and can also be used for cleaning sewage in pumping stations. It is an ideal equipment for water source treatment.

Application:

Rake Bar Screen Filter is an important front road sewage control equipment in sewage treatment. Suitable for water supply and drainage pumping stations, urban sewage, industrial wastewater, food industry, etc.

This equipment operates through a continuous rotating chain or rake mechanism that captures and lifts waste from the water, then discharges it into a collection container. With its automated operation, the rotary bar screen significantly reduces manual labor while improving overall treatment efficiency. The compact structure allows for easy installation in channels or pumping stations, making it suitable for both new projects and system upgrades.

Manufactured from high-quality stainless steel such as SS304 or SS316, the rotary mechanical bar screen offers excellent corrosion resistance and long service life, even in harsh environments. It is widely applied in municipal wastewater treatment plants, industrial effluent treatment, aquaculture systems, and food processing industries.
Overall, the rotary mechanical bar screen is a dependable and cost-effective solution for modern wastewater pretreatment needs.

Component

a) Driving Unit
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.
Adopts shaft-mounted reducer for transmission, screw-type adjusting device is arranged on both sides of the frame to balance the tension of the transmission chain.
The reducer bearings are well lubricated and with service life over 100,000 hours. The gear service factor of the reducer is ≥ 1.5
Low alloy steel and carburized gear, tooth surface hardness is no less than HRC58.
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
One-piece rigid structure made of SUS 304 and structural steel, with sufficient strength and rigidity. No distortion occurs under the condition of 1.0 m water level difference.
The rubber seals on both sides of the rack is used to prevent the rubbish passing the gap between the rack and 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
304 SUS material, the tooth-shaped structure meets smooth unloading, and returning bar after unloading is no adhere to dirt.
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
Equip with closed stainless steel cover, which is openable,convenient for daily maintenance and management

Features                                                                                        

The driving unit is directly driven by cycloidal gear reducer or helical gear reducer which shows the nature of working stability, low noise, big load capability and high efficiency in conveying.

Simple structure with compact size, easy to install and move. Device can self-clean up while working, easy to maintain.

Easy to operate, can be controlled directly on the spot or remote.

Include overload protection device, machine will shut down automatically when malfunction happens to avoid damage.

When the device width exceeds 1500mm, will be made into parallel machine to ensure the overall strength.
 
This rotary grating machine can adjust the operating interval of the device according to user needs, achieving periodic operation; It can be automatically controlled based on the liquid level difference before and after the grille; And it has manual control function for easy maintenance. 

Complete Workflow 

1. Wastewater diversion and debris interception (Step 1: Debris interception)
2. Rake tooth rotation and screenings scraping (Step 2: Screenings scraping)
3. Screenings lifting and automatic unloading (Step 3: Unloading)
4. Rake tooth reset and cyclic operation (Step 4: Cycle)

Working Principle

Rotary mechanical bar screens are core equipment in the pretreatment stage of wastewater treatment plants. Their core function is to automatically and continuously intercept solid debris on the bar screens in the wastewater channel, lift it from underwater to the top, and then automatically scrape and unload it. They also remove larger solid debris (such as branches, plastic bags, fibers, stones, etc.) from the wastewater, preventing blockages in subsequent pumps, pipes, and reactors. Their working principle realizes an automated closed loop of "blocking debris - scraping debris - lifting - unloading", providing clean water for subsequent wastewater treatment processes.

Product Application Scenarios

1. Municipal Wastewater Treatment Plants. Municipal sewage pipe networks collect domestic sewage and road runoff containing large amounts of domestic waste and debris. Mechanical rotary screens are installed in the inlet screen compartment of wastewater treatment plants as the first treatment step, effectively intercepting impurities and ensuring the stable operation of subsequent biochemical treatment, sedimentation, and other processes.

2. Industrial Wastewater Treatment Systems. Suitable for the pretreatment of wastewater from various industrial sectors that generate fibers, debris, and suspended solids:

(1) Food Processing Industry: Wastewater from slaughtering, aquatic product processing, fruit and vegetable canning, brewing, etc., containing a large amount of residue.
(2) Textile Printing and Dyeing Industry: Cotton fibers, yarn, and fiber impurities in wastewater.
(3) Paper Industry: Waste paper recycling and pulp debris in pulping wastewater.
(4) Leather Industry: Leather dander, hair, and fibers in leather processing wastewater.

(5) Coal Mining Industry: Coal slag and sand particles in mine wastewater and mineral processing wastewater.

3. Pumping Stations and Rainwater/Sewage Lifting Systems: Installed at the inlet of rainwater pumping stations and sewage lifting pumping stations to intercept fallen leaves, branches, plastic waste, and large debris in the sewage network, preventing pump impellers from being entangled or blocked, and avoiding equipment failure and downtime.

4. Livestock and Poultry Wastewater Treatment: Livestock farm wastewater contains a large amount of manure residue, feed scraps, hair, etc. Mechanical rotary screens can effectively separate these impurities, reducing the pressure on subsequent solid-liquid separation and biochemical treatment.

5. Landfill Leachate Treatment: Landfill or incinerator leachate contains a large amount of suspended particulate matter and garbage debris. Mechanical rotary screens can be used as a pretreatment step for leachate treatment, removing large particulate impurities and protecting subsequent leachate treatment equipment.