The sealing mechanism is fabricated by welding and precision machining from high-temperature resistant stainless steel and high-temperature pressure vessel steel. The main body is constructed from 310S stainless steel and Q345R pressure vessel steel, while the sealing ring is cast from QT800 spheroidal graphite cast iron and processed with quenching and tempering (QT) heat treatment. This mechanism serves as the core sealing and pressure-bearing component for rubber off-gas treatment, carbon black recovery, and environmental incineration rotary kiln systems. It is primarily installed at the static-to-rotating interface of large-scale environmental rotary kiln drums, providing critical functions of high-temperature sealing, dust containment, gas leak prevention, and thermal retention.
As a key high-temperature unit for the harmless treatment of rubber industry waste gas, waste residue, and carbon black, the rotary kiln operates under severe conditions — high temperature, high-speed rotation, heavy dust load, and complex media — demanding exceptional heat resistance, wear resistance, and dimensional stability from the sealing assembly. This product is purpose-engineered for continuous high-temperature rotary kiln duty, effectively resolving common failures of traditional sealing rings such as deformation, premature wear, air/gas leakage, and insulation breakdown. It ensures stable negative pressure within the kiln chamber, uniform furnace temperature, and compliant off-gas emissions, making it a high-precision, durable replacement and OEM component for environmental rotary kiln systems.
Core Material & Manufacturing Process
The sealing ring is precision-cast from QT800 (GGG80 / EN-GJS-800) high-strength ductile iron, which delivers superior strength, toughness, thermal deformation resistance, and fatigue resistance — far exceeding ordinary cast iron and ideally suited to the cyclic thermal loading of high-temperature rotary equipment.
Each unit undergoes a complete manufacturing sequence:
– Integral precision casting
– Quenching & tempering (QT) heat treatment
– Stress-relief annealing
– Precision turning and finish machining
The result is a dense, defect-free microstructure with no shrinkage porosity or blowholes. The sealing faces are finished by high-precision surface lapping/grinding to achieve superior flatness and uniform sealing contact between the stationary and rotating rings. Every finished piece is individually inspected for dimensional tolerances, surface flaw detection (NDT), and high-temperature deformation testing to guarantee no warping, failure, or leakage under prolonged high-temperature rotating service.
Key Product Advantages
1. High Strength & Superior Heat Deformation Resistance
Manufactured from high-grade QT800 ductile iron with excellent thermal stability, the ring withstands repeated high-temperature thermal shock in rotary kilns without deformation, cracking, or seizure — ideal for 24-hour continuous high-temperature operation.
2. Exceptional Sealing Performance — No Air or Dust Leakage
Precision-lapped sealing faces deliver tight, uniform contact that effectively blocks high-temperature flue gas and dust from escaping, maintaining stable kiln negative pressure and furnace temperature, reducing heat loss, and ensuring compliant, efficient tail-gas treatment.
3. Wear-Resistant, Oxidation-Resistant & Long Service Life
High hardness combined with excellent toughness provides outstanding abrasion resistance, oxidation resistance, and thermal fatigue resistance, enduring continuous drum rotation friction and high-temperature corrosion — significantly reducing replacement frequency and downtime maintenance costs.
4. Precision Tolerances & Easy Installation
Manufactured to industry-standard rotary kiln mating dimensions, the ring offers precise sizing and excellent interchangeability. Quick, simple alignment with no on-site re-machining required — a direct drop-in replacement compatible with both new and existing rotary kiln upgrades and maintenance.
Applications
Widely applicable to:
– Rubber pyrolysis rotary kilns
– Carbon black recovery rotary kilns
– Waste gas incineration rotary kilns
– Industrial harmless treatment rotary kilns (rotary calciners)
The sealing mechanism is mainly used in environmental treatment production lines for tire factories, rubber product manufacturers, and carbon black producers. Both standard models and non-standard custom sizes are available to meet the sealing requirements of rotary kilns of varying diameters and operating conditions.
