What is the Difference Between Extension and Compression Springs?

Tension springs (also called tension springs, referred to as tension springs) are helical springs that support axial tension. Tension springs are generally made of circular cross-section materials. When no load is applied, the coils of the tension spring are generally tight without gaps.

The loops are tightly enclosed so that they can be stretched by force, and loops are looped at each end.

The following is the necessary information for a tension spring:

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GB / T_1239 [1] .1-2009_Cold rolled cylinder

Indicate the material diameter (d), outer diameter (D), total length (Ho), number of working circles (n), position and shape of the earring, load (p 1 p 2 pi) and corresponding values (H1H2 Hj ) As shown in the figure, if there is initial tension, Po needs to be noted .

Spring constant: expressed in k, when the spring is stretched, each additional 1mm distance load (kgf / mm)

Spring constant formula (unit: kgf / mm): k = (GXd ⁴ ) / (8XD _m ⁵ XN _c )

G: rigidity modulus of wire; d: wire diameter; _Dm : middle diameter = outer diameter-wire diameter; Nc: effective number of turns = total number of turns -2.

The initial tension of the tension spring: The initial tension is equal to the force required to pull apart the springs that are close to each other. The initial tension occurs after the spring is rolled into shape. During the production of tension springs, the initial tension of each tension spring is uneven due to differences in wire material, wire diameter, spring index, static electricity, grease, heat treatment, and plating. Therefore, when installing the tension springs of various specifications, it should be pre-tensioned to slightly space between the parallel coils. The force required at this time becomes the initial tension.

Initial tension = Pk X l = maximum load-spring constant X tensile length

Many different end devices or "hooks" are used to secure the source of tension in the tension spring. Tension spring with

Tension springs, also known as helical tension springs, are generally of equal pitch and mostly round in cross-section. They can be used in many situations, such as production assembly, experiments, research and development, and maintenance. Extension springs occupy an important position in the global market and are widely used in defense, marine, computer, electronics, automotive, mold, medicine, biochemistry, aerospace, railway, nuclear power, wind power, thermal power, engineering machinery, mining machinery, construction machinery, Elevators and other fields.