In sorting robot systems, the sealing reliability of vacuum suction cups directly determines both gripping stability and overall equipment efficiency.
As a core sealing component, the O-ring plays a critical role. Its material properties, structural compatibility, and installation precision are key factors affecting the long-term stable operation of the vacuum system.
O-Ring Material Selection Recommendations
Nitrile Rubber (NBR)
Features: Good wear resistance, stable elasticity, cost-effective
Operating Temperature: -40°C to 125°C
Suitable for: Standard sorting conditions and general vacuum systems
Fluoroelastomer (FKM)
Features: High-temperature resistance, oil and chemical resistance
Operating Temperature: Up to 250°C
Suitable for: High-temperature environments or vacuum systems with higher stability requirements
Perfluoroelastomer (FFKM)
Features: Extreme high-temperature resistance (up to 325°C), excellent chemical resistance
Suitable for: High-end or specialized applications
Note: High cost makes it uncommon for standard systems
Installation and Structural Design Guidelines
Dynamic sealing compression: 6%–20%
Static sealing compression: 15%–30%
Seal groove width: ≥ 1.4 × O-ring cross-section diameter
Sealing surface roughness: Recommended Ra ≤ 0.8 μm
Groove quality: Free of burrs and sharp edges to prevent extrusion or cutting
Practical Usage Considerations
Avoid lubricants containing molybdenum disulfide
In high-vacuum applications, carefully consider gas permeability
Implement a regular inspection and replacement schedule
Keep suction cups and workpiece surfaces clean
By selecting appropriate materials and following proper installation practices, the stability of vacuum adsorption and the overall service life of the system can be significantly improved.
