A spring is a mechanical part that USES elasticity to work. The parts made of elastic materials are deformed under the action of external forces, and then recover to their original state after removing the external forces. Also known as "spring". Usually made of spring steel. The kind of spring is complex and diverse, according to the shape, mainly has the spiral spring, the coil spring, the plate spring, the shaped spring and so on.

Although the spring industry is a small industry in the whole manufacturing industry, its role is not underestimated. The country's industrial manufacturing industry, the automobile industry to speed up the development, and as one of the basic parts, parts of the spring industry more need to have a development lead period, in order to adapt to the rapid development of the country's entire industry. In addition, the expansion of spring products, the improvement of quality level is also the need to upgrade the mechanical equipment and supporting the performance of the host to improve the need.

Spring products play an important role. Commodity industry and hardware industry, including cigarette lighters, toys, locks, door hinges, machines, mattress, sofa, etc., in terms of quantity, the larger demand for spring, hundreds of billions of pieces, technical requirement is not high, the price is very low, generally small spring factory production by scattered all over the country, they have a unique advantage on cost, big spring factory is difficult to compete with them.

Tension spring (tension spring) is to bear the axial tension of the helical spring, tension spring is generally made of circular section material. When the load is not borne, the tension between the spring ring and ring are generally tight and no gap. It is widely used in machines and instruments to control the movement of parts, store energy and measure the force by using the rebound force (tension) after stretching. Of course, these are from the circle machine, bending machine, bending machine, pipe bending machine, compressor, punching machine, shear machine and other mechanical and electrical equipment production.