The working principle of the extension spring is just the opposite of that of the compression spring. The compression spring has a reverse effect when there is pressure, and the extension spring has a reverse effect when it is stretched. When the tension spring is pulled open, the spring wants to pull back, which generates force.

Extension springs can absorb and store energy. The difference between extension springs and compression springs is that under certain tension or no tension, this initial state determines the tightness of the extension spring. In this way, controlling the initial force can meet the unacceptable demand.

The two ends of the tension spring are fixed to other components, and then when these components are separated, the tension spring has an effect. The coils are close together to produce a strong tensile force, which will connect these components to together. These spring coils are tightly connected together without tension. The closing of the spring includes hooks hanging on other components, as well as small holes and geometrical interfaces. With these fixed on the components that need to be connected, it is not a problem In this way, when there is tension, it will provide a certain resilience for these components.