In a mechanized times of today, machinery, highly effective and efficient, has been an necessity for most work or project which can’t be done merely by manpower. Machinery has also made our life far easier than ever before. A simple example, when an automobile breaks down on the road, unable to star however to try, will cause traffic jam if it’s not moved for long. Here a crane can easily do rather than difficultly by man labor. Such an operation is mainly attributed to a hydraulic cylinder system which can supply great power (of lifting) to hang it up. In this aspect, we call the hydraulic cylinder system a core organ of a crane.
Hydraulic cylinder can be divided primarily into 3 categories namely piston cylinder, plunger cylinder and swinging cylinder, with different functions for different purposes of machinery. A piston cylinder, as well as a plunger cylinder is mainly employed where rectilinear reciprocating motion is needed, like the function it performs in a crane. For its wide utility in a crane, compared with a swinging cylinder, it must be characterised with strong capacity of weight. On the other hand, a swinging cylinder plays mainly a roll of swinging by outputting torque and angular velocity for purpose of controlling of rotation and swinging in a crane. In this way, a swinging cylinder is an important reinforcement of functions of a crane.
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