band screens are an efficient fine grid decontamination device that combines interception and decontamination. They are widely used as fine grids in large, medium, and small pump stations to intercept and remove floating objects in water, such as weeds, paper, cigarette butts, melon seeds, fibers, hair, etc.

Working principle, structural composition, and technical parameters of band screens

working principle

Band screens consist of a continuously rotating mesh board driven by a motor placed in a fixed frame. The sewage to be filtered enters through the middle opening of the fine grid and is filtered for impurities from the inside out through the mesh plates on both sides. As the mesh plate rotates continuously, the impurities accumulated on the inside of the mesh plate are lifted by the lifting steps on the mesh plate to the slag discharge area, and are washed by the flushing water at the top of the mesh machine into the waste collection tank.

Structural composition

Grille frame: The frame of the grille machine is made into an integral structure for easy lifting and installation in the civil structure. The frame structure is equipped with replaceable rolling bars and mesh guide devices to guide the rotation of the mesh. At the bottom of the frame is a replaceable semi-circular guide rail, used to assist in the steering of the mesh board when rotating at the bottom.

Chain of grille: Under the drive of the transmission chain, the mesh plate extracts the dirt trapped within its length range from bottom to top. When it reaches the upper part, it automatically completes the unloading work through the steering function of the sprocket and the flushing water of the top mounted flushing device. The slag water is discharged into the slag collection groove between the two side mesh plates and then flows out of the machine by itself.

technical parameter

Each unit is designed with a water flow rate of 55000 m ³/d. Installation location: between grilles. Inlet water quality: sewage inlet and outlet form: middle inlet, both sides outlet. Inlet flow rate of grilles: ≤ 1 m/s grid perforation velocity: ≤ 0.6 m/s grid outflow velocity: ≤ Head loss at 1 m/s blockage rate of 60%: ≤ 50 mm filtration device structure form: filter orifice plate filtration accuracy: 2 mm inlet channel width: 1680 mm channel depth: 2700 mm design water depth: 1700 mm grid maximum allowable liquid level difference: 200 mm installation angle: 90 ° separation efficiency: ≥ 98% working system: continuous and intermittent power supply: 380V/3ph/50Hz motor protection level/insulation level: IP55/F noise: ≤ 78dB (A) Drive motor power: 0.37 kW Whole machine life: ≥ 15 years Equipment dimensions: 12008605000 mm Leakage rate before and after grille: 0%

Band screens are suitable for various water treatment scenarios, including:

Application of MBR process membrane grid in municipal sewage treatment plant pretreatment section Industrial sewage treatment plant Water plant Advantages and characteristics

High removal rate: It can effectively remove fibrous substances such as hair.

Good backwash effect: The backwash water thoroughly removes the dirt trapped on the mesh plate, preventing it from falling into the filtered water and avoiding secondary pollution.

Wear resistant and corrosion-resistant: The mesh plate is made of non-metallic injection molded parts, which are wear-resistant and corrosion-resistant.

Easy maintenance: There are no transmission components underwater, so no maintenance is required, making it easier to inspect and maintain.

Standardization of Wear prone Parts: Wear prone parts are fully standardized, easy to ｒｅｐｌａｃｅ, and easy to operate.

Smooth operation: light vibration and low noise.

Scope of application

Band screens are suitable for large, medium, and small pump stations as fine grilles to intercept and remove floating debris in water. They have a high waste capture rate and can ensure the effective implementation of subsequent treatment processes.

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