* first cylindrical spiral tensile spring application is more of a spring, but due to the damage easily hook loop at each end, so the
compression spring instead of as much as possible.
Tensile structure, the end of spring a few of the commonly used have been included in the national standard.
Tensile spring end shape is mainly in the form of a shackle, these hook ring by the end of the spring coil or wire bending.
In the design or select the end structure form, should mainly consider spring installed in the mechanical method, space, the nature of the load, and other factors.
On the premise of meet the requirements, try to choose simple structure shape.
Semicircle shackle: by the end of the spring half a spring coil bending, occasions for limited space.
By the end of the spring to the center of spring coil bending and twisting, the formation of high stress of the bend torsion, apply to rotate relatively small load of the spring.
Round carabiners: by the end of the spring to the center of spring coil bending and twisting, bending twist the trip of high stress, suitable for large to rotate, and smaller spring load.
Eccentric circle shackle: by the end of the spring coil bending, shackle in the spring on the edge of the tangent position, owing to the eccentricity of the load and the shackle root 90 ° bend, the additional stress in the steel wire under high, the end structure is suitable for medium to rotate than C = 8 ~ 15.
Spring load is small or unimportant, is located in the middle of the spring coil round carabiners pressure center, is by the end of the bend to the pressure center, and compared with the eccentric circle hook ring, can avoid the eccentricity of the load, more safe and reliable, widely used for wrapping spring than less than 20 and under high load.
Long arm shackle: responsible for processing, generally try to avoid using, all with bending processing constitute a shackle, all in steel wire bending place produce larger stress several, so with bending processing constitute a shackle end structure, we recommend the user material in 4 mm diameter of spring.
But as a result of this method is simple, and sometimes with user material around 10 mm diameter of spring.
In order to reduce the stress of several, can use additional hook ring structure, the ends with helical cylindrical screw as spring ~ 2 laps, in cylindrical battery plus screw, this structure is suitable for the material spring is greater than 5 mm in diameter.
Also can be made conical spring end closed end, can turn the additional shackle.
The relative position of the hook loop at each end, can be in a straight line or talk to 90 °, or as required at any Angle.
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