In adverse operating conditions, when ordinary chains simply break due to loads, roller chains with curved plates are used (GOST 13568-97).
The main difference of this kind of products is the use of bent steel (alloy) plates in the structure.
External and internal links in these chains
are made in the same size, as a result, during operation, the wear of the links is uniform.
In cases of dynamic loads (with strong impacts, frequent reverses, etc.), the chain does not break – the product simply changes its shape (straightens up).
They do not slip (similar to belt drives);
They give less load on the shafts (at the same time, chain tension is not required in advance);
They transmit motion between the shafts with significant interaxial distances;
Demonstrate high efficiency;
They work smoothly even in conditions of frequent starts and braking, and are easily replaced if necessary.
Roller chains with curved plates can be used in the most difficult conditions: the destructive load is from 36,000 kg (for the chain PRY-78,1-360) to 120,000 kg (PRY-140-1200).
It should be taken into account that the weight of PRY chains is quite large: 1 m weighs from 14.5 kg (PRY-78.1-360) to 63 (PRY-140-1200).
Since the plates work for bending, they are used under dynamic loads and at speeds of no more than 5 m/sec (tractors of conveyors, construction equipment, tracked machines, oil drilling equipment, etc.).
You can read more detailed characteristics of cape chains for harvesting sunflowers in the table
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