orsion spring (torsion spring) makes full use of the principle of lever. It can twist or rotate the elastic material with soft material and high toughness, so that it has great mechanical energy. It is a spring that bears torsion deformation, and its working part is also closely encircled or separated. The end structure of torsion spring is made into torsion arms of various shapes, from single torsion to double torsion, and even the deformation of various torsion bars. Torsion spring is often used in mechanical balancing mechanism, and is widely used in automobile, machine tool, electrical appliances and other industrial production.