Hoisting and hauling chain drive
Chain hoists are probably the most common piece of machinery used to lift and lower equipment. They can lift massive weights with very little effort using pulleys.
Hand chain hoists or chain blocks are a common sight in garages, workshops, construction sites, ship engine rooms and in many factories. They can lift/lower heavy loads going up to 20 tonnes. Hoisting chains can be pneumatic, electrical or manual.
We will be focusing on the different types of chains in the next section but since hoisting chains are rather straightforward in their design and field of application, we’ll be covering them here. Hoist chains can be divided into two categories:
· Oval link chains
· Stud link chains
Oval link chains
Oval link chains are also known as coil chains. They are commonly used as hoisting chains for low to medium loads and are generally meant to be used in low-speed lifting applications. The chain link is oval-shaped and each one is welded after interlocking.
Sometimes, square link types of chains may be used but they are generally avoided due to poor stress distribution and kinking issues.
Stud link chains
Stud link chains are a better alternative for high-load applications. Each chain link is fitted with a stud across its inner width. The studs prevent kinking and increase strength and durability. Stud link chains find use in ship anchors and in other heavy-duty lifting machines.
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