Dust Collector Filter Cage

Dust collector filter cage, also called bag cage, is the metal frame that supports the filter bag in a baghouse. It is installed on the tube sheet, with the filter bag fitted on the outside. The cage is welded from longitudinal wires and support rings into a cage structure, keeping the bag open during filtration, cleaning, and reverse-air operation. The top can be fitted with a venturi or protective short tube to guide pulse jet air and protect the bag top.

• Silicone-coated cages can replace stainless steel in many high-temperature conditions; carbon steel substrate with silicone powder electrostatic coating has acid, alkali, and high-temperature resistance, adhesion strength, continuous use at 200°C, coating thickness 60–100 μm.
• Galvanized cages are for dry, low-corrosion, ambient-temperature conditions, with smooth surface and no zinc lumps.
• Silicone-coated cages are for 120–280°C medium-to-high temperature conditions.
• Longitudinal wire spacing: ≤40 mm for chemical fiber needle felt bags; ≤20 mm for fiberglass woven bags.
• Support ring spacing controlled within 150–200 mm, evenly distributed along the cage length.

• Pulse-jet baghouse matching
• Cement plant kiln tail and kiln head dedusting systems
• Steel plant sintering machine and converter dedusting
• Coal-fired and biomass boiler flue gas dedusting
• Chemical plant dust treatment
• Mining crushing and screening dedusting

• Diameter and length customized to bag size and tube sheet hole
• Longitudinal wire quantity adjusted to bag material and filtration velocity
• Surface treatment: galvanized, powder coating, silicone coating
• Oval, flat, and envelope cages available
• Venturi size and material optional
• Split-type cage adjustable to installation space
• Filter bags supplied as matching accessory
• OEM/ODM: customized to drawing or sample; customer brand on packaging

Each cage is inspected after welding for wire-to-ring welds, confirming no missed, weak, or incomplete welds. Welded areas are smooth, without cracks or pits. Silicone-coated cages are additionally checked for coating uniformity and adhesion; no peeling allowed. Diameter, length, and verticality inspected to standard tolerance; diameter tolerance is negative. 100% visual inspection before packing. Third-party inspection accepted. The factory has supplied cages matched with P84, PPS, and fiberglass bags in high-temperature projects, and uses this field data to adjust wire spacing and coating thickness.