Spring of all the parts belong to the most trivial, its small size, not easy to focus on, but it is the most important part of. Spring elasticity was mainly used for mechanical parts, usually made from spring steel. Mainly control the movement of the parts, moderate impact or measuring force, the size of the storage energy storage, etc., widely used in the machine. Spring species is very complex, can be divided into: vortex coil spring, coil spring, plate spring, spring coupling, etc. Spring is an accumulator, it has the function of storing energy, but can't release energy, need to slowly release, it has appeared in early spring before, ancient bow and crossbow is two kinds of spring in the broadest sense of the term. ?

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