The filter cage, also known as the filter bag frame, is an important component that supports the dust removal filter bags. Its main function is to maintain the shape of the filter bags and prevent them from deforming or being damaged due to force during filtration and dust cleaning. At the same time, it provides a smooth passage for the airflow. The quality and design rationality of the filter cage directly affect the service life of the filter bags and the operational stability of the dust removal system.
Structure and Material
The filter cage is usually in a circular or elliptical frame structure, welded by longitudinal and transverse ribs. It has a lifting cap or flange at the top, making it easy to install and fix. The number and diameter of the longitudinal and transverse ribs are determined according to the size of the filter bag and the working pressure to ensure that the filter cage has sufficient strength and rigidity.
The selection of the material for the filter cage needs to consider factors such as corrosion resistance, strength, and cost. Common materials include ordinary carbon steel, galvanized steel wire, and stainless steel. Ordinary carbon steel has a lower cost but poorer corrosion resistance, suitable for dry and non-corrosive environments; galvanized steel wire is treated with surface galvanization, improving corrosion resistance, and is widely used; stainless steel has excellent corrosion resistance and strength, suitable for harsh environments with high corrosion, but has a relatively higher cost.
Surface treatment process
To further enhance the corrosion resistance and service life of the filter cage, surface treatment is usually carried out. Common surface treatment processes include galvanization, powder coating, and chrome plating. Galvanization involves immersing the filter cage in molten zinc liquid to form a zinc coating on its surface, providing corrosion protection; powder coating involves spraying plastic powder on the filter cage surface and curing to form a uniform plastic coating, with good corrosion resistance and decorative properties; chrome plating forms a hard, wear-resistant, and corrosion-resistant chromium coating on the filter cage surface, suitable for occasions with high surface performance requirements.
Compatibility and Function with Filter Bags
The compatibility and function of the filter cage and the dust removal filter bags are crucial. The dimensions of the two must be precisely matched to ensure that the filter bags can be tightly fitted on the filter cage, preventing them from shaking or falling off during operation. The surface of the filter cage should be smooth without burrs to prevent scratches on the filter bags.
During the operation of the dust removal system, the functions of the filter cage are as follows:
Supporting filter bags: In the filtration state, the interior of the filter bag is negative pressure, and the filter cage can support the filter bag to prevent it from being sucked flat; in the dust cleaning state, the filter bag will expand, and the filter cage can limit the excessive expansion of the filter bag to avoid damage to the filter bag due to excessive stretching.
Ensuring smooth airflow: The structural design of the filter cage provides a passage for the airflow, allowing clean gas to pass through the filter bag smoothly and be discharged, reducing air resistance.
Extending filter bag life: By stabilizing the shape and position of the filter bag, reducing wear and tearing of the filter bag, and thus extending the service life of the filter bag.
Maintenance and Care
