The core logic of the belt filter's working principle

The working principle of the belt filter machine revolves around "solid-liquid separation," utilizing filtering media (belt) to intercept solid particles, allowing the liquid to pass through the filter cloth for purification. Depending on the driving method, it is mainly divided into two categories:

Gravity-fed Belt Filter: Relying on the natural gravity of the liquid for filtration

Filtering Process:

Wastewater containing solid impurities is fed into the filter press. Under the force of gravity, the liquid passes through the filter paper (belt), while the impurities are retained on the belt to form a "filter cake."

2. Automatic Belt Change Mechanism

As the filter cake thickens, the slurry level rises, triggering the level controller, which drives the motor to move the belt, conveying the soiled paper belt with the filter cake to the waste collection area. Simultaneously, new paper belt enters the filtering zone. Once the level drops, the motor stops, and the process moves to the next filtering cycle.

3. Typical structural function:

The squeezing unit (such as squeezing rolls) can compress the filter cake, reduce liquid residue, and enhance the efficiency of solid-liquid separation.

◦ The cleaning system uses spray methods to clean the tape surface, extending the lifespan of the filtration medium.

Two, Forced Tape Filter: Enhanced filtration through external force (pneumatic/hydraulic pressure)

Vacuum Filtration (Vacuum Pressure)

By creating a vacuum using a vacuum pump in the filtration area, the liquid is forced through the filter paper, resulting in a higher filtration precision (down to 10 microns or less) and is suitable for liquids with fine impurities or high viscosity (such as cutting fluids, inks).

Positive Pressure (Pressure Filtration)

Applying pressure to wastewater using a pump allows the liquid to pass through filter paper under pressure, resulting in increased flow rates (up to 5000L/min), commonly used in large-scale industrial wastewater treatment or chemical production.

3. Hofmann-style:

By integrating pressure and mechanical structures, the system enhances filtration efficiency through periodic pressure variations, while also featuring oil removal and oxygen enrichment capabilities, making it suitable for treating oil-contaminated coolant.

Summary of Core Principles

Whether gravity-based or forced, the fundamental principle of belt filter machines is the separation of solid and liquid through the interception of filtering media. The difference lies in the driving force (gravity/external force) and the impact of structural design on the filtration efficiency and accuracy. In practical applications, the appropriate type is selected based on the properties of the liquid (viscosity, particle size of impurities, flow rate) to achieve the goal of efficient purification.