Stretch springs are generally of equal pitch, and the cross-section is mostly circular. When the spring is not under pressure, there is no gap between each turn and each turn, and the connection is very compact. It's widely used in the medical field, not only respiratory devices, mobile devices, motion control, but also some home care devices, mechatronic protective hardware, actuators, hand tools and some mechanical devices, switching devices are all used to stretch springs. In addition to the ocean, national defense and wind, railway, aerospace and machinery, elevator and other fields, stretch spring manufacturers have irreplaceable role.

Advantages of stretch spring:

A stretch spring works exactly the opposite of a compression spring. The difference between a stretch spring and a compression spring is that the initial state of the spring, with or without tension, determines the degree of precision of the spring. In this way the control of the initial force can meet the requirements of non-compatibility conditions.

The two ends of the stretch spring are fixed to other components. Then, when these components are separated, the stretch spring will have an effect. The circles are precisely drawn together to produce a strong pull resistance, which will connect these components together. The spring coil in the absence of tension precision connect together of the time, or spring including the retractor hung on other components, and the geometry of the pores and interface, with the fixed on the need to connect components, it is not problem, so that when there are tension for these components provide a certain amount of bounce back.

Common materials of stretch spring:

The materials often used in stretch springs are mainly carbon spring steel, which is relatively cheap, but the elastic limit is low; Low manganese spring steel has good strength and extraction permeability, but it is easy to crack in quenching. The elastic limit of guimeng spring steel is improved and has good mechanical properties. Chromium vanadium steel toughness and strength are relatively good, the price will be more expensive.