Partial structure of hook tension spring

 There are many hook structures of tension spring, among which the most commonly used ones have been included in national standards. The end shape of the tension spring is mainly a shackle, which is formed by bending the end spring coil or steel wire. When designing or selecting the end structure, the main consideration is Spring On the premise that the installation method, installation space, load nature and other factors in the hook meet the requirements, try to select simple structural shapes.

1. A semicircular shackle is made by bending half of the spring coil at the end of the spring. It is used in situations where the space is limited.

2. Torsion round hook and loop is formed by bending and twisting the spring coil at the end of the spring to the center. High stress is formed at the bending and twisting position, which is suitable for springs with large winding ratio and small load.

3. Eccentric circular shackle is formed by bending the end spring coil. The shackle is located at the tangent position of the edge of the spring coil. Due to the eccentricity of the load and the 90 degree bending of the shackle root, the steel wire bears large additional stress. This end structure is suitable for springs with medium winding ratio of 8~15, small load or insignificant load.