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Specific reasons for cracking of rubber joints
The cracking of rubber joints is a common problem in industrial piping systems, which is closely related to material properties, environmental factors, improper installation and use. The following is an analysis of the specific reasons:
1. Material and manufacturing factors
Rubber aging
Thermal oxidation aging: High temperature environment accelerates the breakage of rubber molecular chains, causing the material to harden and crack.
Ozone aging: Ozone reacts with double bonds in rubber to form cracks, which is common in outdoor environments.
Light aging: Ultraviolet rays destroy the molecular structure of rubber, reduce elasticity, and accelerate cracking.
Rubber formula defects
Insufficient or excessive vulcanization leads to a decrease in the physical properties of rubber.
Improper selection of additives such as fillers and plasticizers affects the durability of materials.
Manufacturing process problems
Uneven vulcanization and local stress concentration.
Irrational mold design leads to uneven product wall thickness.
2. Environmental and medium factors
Medium corrosion
The conveying medium contains corrosive substances such as acids, alkalis, and salts, which corrode the inner wall of the rubber.
The organic solvent in the medium dissolves the rubber component, causing swelling and cracking.
Temperature and pressure fluctuations
Long-term high or low temperature environment deteriorates the performance of rubber materials.
Pressure fluctuations cause frequent deformation of joints and accelerate fatigue cracking.
Mechanical damage
Excessive stretching or compression during installation exceeds the designed deformation of the rubber joint.
Pipeline vibration and impact loads cause fatigue damage to the joint.
III. Improper installation and use
Installation problems
Uneven bolt preload leads to uneven force on the joint.
Failure to consider the flow direction of the medium and the wrong installation direction.
Usage problems
Use beyond the design pressure and temperature range.
Failure to check and maintain regularly, aging or damage is not discovered in time.
IV. Other factors
Design defects
Improper selection of joints, unable to withstand actual working conditions.
Failure to consider medium characteristics, such as high temperature, high pressure, corrosiveness, etc.
Storage and transportation
Long-term exposure to sunlight accelerates aging.
Collision and extrusion during transportation cause mechanical damage.
Preventive measures
Select high-quality materials
Select corrosion-resistant and aging-resistant rubber materials according to medium characteristics.
Ensure that the rubber formula is reasonable and the vulcanization process is perfect.
Standardized installation and use
Install correctly according to the instructions to ensure uniform bolt preload.
Avoid overpressure and overtemperature use, and perform regular inspections and maintenance.
Strengthen protection
In outdoor or corrosive environments, use protective sleeves or coatings.
Reduce pipeline vibration and install shock absorbers when necessary.
Regular inspection
Regularly inspect the appearance of the joints and replace them in time if cracks or deformations are found.
Use professional equipment to detect the sealing and deformation of the joints.
The above measures can effectively extend the service life of rubber joints and reduce the risk of cracking.
2025-04-20 15:10:07