High speed door spring error reasonable range

High speed door spring error reasonable range

1, the tolerance of the inner diameter of the spring is ±1.0% of the basic diameter D1.

2, The free length of the spring H0 is the reference size.

3, the tolerance of the total number of springs is ±1.0% of the total number of springs N1. The total number of turns of the manual industrial door supporting spring should be strictly controlled tolerance requirements of the total number of turns of N1 ±0.5%.

4, spring in free state, there should be no initial tension, the gap between the ring and the ring should be less than 0.2mm, in order to prevent the installation of "S" shaped bending phenomenon.

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