A special spring is a mechanical part that uses elastic rebound, usually made of spring steel. It is often used to control the movement of parts, reduce shock or vibration, store energy and measure tension, such as valve springs in internal combustion engines, control springs in clutches, cushion springs in cars and train cars, and shock absorber springs in automobiles. Blinds, clock springs, firearms, dynamometer springs, spring scales, etc.

Special springs are elastic elements widely used in the electromechanical industry. A large elastic deformation occurs during loading, which then converts mechanical or kinematic energy into deflection energy. After unloading, it returns to its original shape and converts the deflection energy into mechanical energy or mechanical energy. The special spring has the advantages of small size, large load, convenient assembly and uniform load. In order to obtain different curves, it can be used for different stacking positions, such as stacking inserts with increased deflection, stacking with increased load, or parallel series combination stacking.

In the machinery industry, it replaces cylindrical coil springs with a larger range and function, and the smaller deflection can still reflect the miniaturization of the design and the diversification of functions. Through the loading test, the product bears a larger load, and the axial space is also compact compared to other types of products, and the product has a larger deflection energy per unit volume and better shock absorption and vibration absorption capacity. This "parallel" combination has a significant effect in shock absorption and energy dissipation due to the friction damping effect of the surface. At present, it is widely used in national defense, metallurgy, engineering, electric power, machine tools, construction and other industries, such as molds, valves, clutches, brakes, supporting gantry, bridge shock absorption devices, bearing preload, etc. Overload devices, heavy machinery, mechanical actuators, control devices, industrial furnaces, indexing mechanisms, clamping devices, etc.