Overview

Constant force spring is a special tension spring. They consist of helical metal plates that are bent on the inside so that each coil is tightly wound around the inside of the metal plate. When the metal plate is stretched (twisted), the internal stresses resist the load force, which is exactly the same as that of a normal stretch spring, but the coefficient is close to constant (zero).

Constant force spring is suitable for high tension, load does not increase occasions. In use, the inner diameter is usually used to wrap the spring tightly around the drum, with the free end attached to the load, like a counterweight. But it can also be done the other way around, with the free end fixed and the spring itself providing the working force, as in electrical equipment. Constant force springs can produce considerable elasticity because the load capacity can be multiplied if two or more springs are connected back to back or in series. Compared with ordinary compression spring or tension spring, the elastic force is very constant, and can output almost linear elastic force, to ensure that the product will not change due to the change of elastic force in the process of use. In the long and narrow space, the space can be reduced as much as possible, increasing the possibility of product aesthetic design.   

Usually, the outside diameter value of constant force spring is set according to the installation space. Sometimes, when using intermediate shafts, the inside diameter value must also be considered. The general outer diameter of constant force spring can not be greater than the installation space, otherwise it will produce friction effect. Our company has an independent factory site with the building area of 27000 square meters, the land area of more than 14300 square meters. Product testing equipment is complete, with nano electron accelerator, injection moulding machine, rubber molding machine and other production and manufacturing equipment. Also it has high pressure screening test center, fully meet the needs of product inspection and testing.

Our products, including Constant force spring, have passed : 2015 quality management system, environmental management system and OHSAS18001 occupational health and safety management system and the national production safety standardization certification, full implementation "6S" production management system, realize products zero defect, dedicated to provide customers with stable quality, reliable performance and high added value high quality products.

Constant force spring material is SUS301 series. The material has the advantages of high hardness, high tensile strength, smooth surface, good rust resistance and easy processing. Makes this material almost ideal for constant force springs. The hardness can reach about Hv600 (after low temperature heat treatment), the tensile strength can reach more than 1665Mpa, the nickel content is between 6.0 and 8.0, in order to ensure its good anti-rust performance.