For Use at Low-temperature
When working with conveyor chains at low-temperature this kind of as in a refrigerator or in a cold ambiance, the next problems may perhaps take place.
one) Very low temperature brittleness
Usually, a material is embrittled at low-temperature and shock resistance is lowered. This phenomenon is termed low-temperature brittleness, and also the degree of embrittlement differs from material to materials.
The support limit of the conveyor chain depends on its specs.
2)Influence of freezing
At low-temperature, bending failure, roller rotation failure, fixing of chain, and so forth. could possibly be induced from the freezing of penetrated water or deposited frost during the clearance amongst pins and bushings, bushings and rollers or inner plates and outer plates. These conditions bring about an overload to act over the chain and drive, diminishing the life of the chain.
To prevent freezing, normally, it is actually proposed to fill the clearances with a low-temperature lubricant suitable on the services temperature to prevent water, frost, etc. from penetrating the respective portions with the chain. For lubrication, a silicon based mostly grease is suggested.
For Use at High-temperature
Chains strength is diminished by high-temperature atmosphere, direct conveying of high-temperature loads, or radiated heat, and so forth. The support restrict at high-temperature depends not to the temperature with the services setting however the temperature and material on the chain physique.
Following disorders may well arise when chains are utilised at high-temperature:
1) High temperature brittleness and fracture by lowered hardness of heat handled material
2) Brittleness brought about by carbide precipitation
three) Abnormal wear by scale
four) Fatigue fracture induced by repeated thermal shock (cooling and growth)
5) Abnormal dress in resulting from a rise while in the coefficient of friction
6) Creep fracture
7) Fracture as a result of thermal fatigue of welded area
8) Effects caused by thermal expansion
?Stiff back links and rotation failure due to decreased clearance ?Fatigue fracture resulting from lowered fitting force
9）Lubrication failure and stiff back links on account of deterioration and carbonization of lubricating oil
Grease excellent in heat resistance involve these based on silicon, graphite or molybdenum disulfide.
For use at high-temperature, high-temperature resistance bearings and stainless steel bearings are suggested.