Bag Cage

 Alternative Names and Product Positioning 

Alternative names:

Dust removal bag cage, filter bag frame, dust removal frame, support ring (common industry terms).

Product positioning

The core supporting structure of the bag-type dust collector is formed by welding metal wires, which is used to fix the shape of the filter bags, prevent them from being sucked in, and ensure uniform airflow distribution and efficient dust cleaning. Its performance directly affects the lifespan of the filter bags and the dust removal efficiency.

 Core features 

Structural design

Component functional technical parameters

Vertical rib main body support, anti-filter bag collapse quantity: 8 to 24 (suitable for filter bag diameter)

Support ring anti-negative pressure deformation, roundness retention spacing: 150-250mm (densifier in high-temperature working conditions)

The Venturi tube guides the pulse airflow, enhancing the ash cleaning efficiency. The horn Angle is 30° to 45°, and the airflow accelerates by three times

The bottom of the bag is designed with thickened protection to prevent filter bag wear or a smooth closing (R corner ≥10mm)

Materials and craftsmanship

The material type has limited advantages in applicable scenarios

Galvanized low-carbon steel has low cost and high strength in a dry environment at normal temperature (T≤80℃), but it is not resistant to acid/moisture corrosion

304 stainless steel is resistant to weak acids and alkalis at medium temperature and humidity (T≤200℃), with a service life of 5 to 8 years. However, it is costly and not resistant to Cl⁻ corrosion

316L stainless steel for waste incineration/chemical industry (strong corrosion), resistant to Cl⁻/SO₂, with a lifespan of 8 to 10 years, but expensive (approximately twice that of 304)

The surface of the silicone resin sprayed with high-humidity and sticky dust is smooth and anti-sticking, reducing wear. The temperature resistance is ≤220℃

Process key:

Automated welding: argon arc welding/resistance welding, weld point tensile strength ≥500N;

Verticality control: Tolerance ≤0.5% (for example, deviation of a 2m frame ≤10mm);

Surface treatment: Galvanized coating ≥80μm, silicon spraying thickness 50-100μm.

 Typical application scenarios 

Key points for selecting the framework of industry working conditions challenges

High-alkali dust at the tail end of the cement kiln +150℃ high-temperature 304 stainless steel + support ring spacing 150mm

Acidic flue gas from waste incineration (HCl) + moist 316L stainless steel + silicon spraying

High-sulfur flue gas from coal-fired power plants + optimization of pulse ash cleaning Venturi tubes + 20 vertical bars

Chemical acid mist strong corrosion (pH 1-2) 316L+PTFE coating (upgraded corrosion resistance)

Food and pharmaceutical GMP cleanliness requirements: All stainless steel + mirror polishing

 Product advantages 

Extend the service life of filter bags

Roundness tolerance ≤±1% (to prevent filter bag friction damage), with a 30% increase in service life.

The Venturi tube design reduces the pulse pressure to 0.3MPa (the traditional one requires 0.5MPa).

Energy conservation and consumption reduction

The uniformity of air flow distribution is over 95%, the system resistance is reduced by 15%, and the annual electricity savings exceed 100,000 yuan (based on an air volume of 100,000 m³/h).

Safe and reliable

Seismic design (amplitude < 0.1mm@50Hz) to prevent weld separation and fracture;

Anti-static design (surface resistance ≤10⁹Ω), suitable for flammable dust.

 Customization Process 

Demand Matching (3 to 5 days

Provided: filter bag size (diameter/length), working conditions (temperature/corrosiveness), and dust collector model (such as PPC96-8).

Scheme Design (1-2 weeks)

Structural design: Number of vertical bars, spacing of support rings, Angle of Venturi tubes;

Material selection: Choose steel or surface treatment based on corrosion grade.

Special requirements: Anti-collapse ring, quick-installation clamp, segmented structure (when > 3m).

Sample verification (2 weeks)

3D drawing confirmation → Sample trial assembly (matching filter bags) → Roundness/verticality inspection.

Batch delivery (3 to 4 weeks

Fully automatic welding line → Surface treatment (galvanizing/spraying) → anti-deformation packaging.

 Quality inspection procedures (in accordance with JB/T 11261-2012) 

Raw material inspection

Wire material report (SGS certification), diameter tolerance ±0.05mm (e.g. φ4.0mm).

Production process monitoring

Standard for testing item methods

The tensile strength of the weld joint of the welding tensile testing machine is ≥500N

The deviation of the verticality laser level is ≤ 0.5% of the frame length

The diameter tolerance detected by the roundness ring gauge is ≤±1%

Finished product testing

Standard qualification indicators for test items

ASTM B117 salt spray test for anti-corrosion performance: No white rust on galvanized coating after 72 hours.

Silicon spraying: No bubbling after 500 hours

The static pressure test for load capacity shows no deformation under a negative pressure of -6000Pa

The dust cleaning simulation VDI3926 pulse test shows no entanglement or wear on the filter bags

Factory release and annual inspection

For each batch, conduct a full inspection of verticality/roundness, and randomly check 10% for salt spray testing.

Annual inspection includes fatigue testing (100,000 pulse simulations).