工业门的弹簧主要起的是一个平衡的作用，减轻电机的负担。弹簧的力量和门的力量相当是最理想的配置状态 。弹簧力量大了 ，山东工业门会自动往上穿轨道而出 。弹簧力量小了 ，电机带不动或者废电机 。弹簧不好的话 ，当时没问题 ，很快就没有力量了 。
     industrial door spring main function is a balanced, lighten the load of the motor. Spring force and the power of door quite is the ideal state of configuration. Spring force big, the changchun industrial door will automatically upgrade to wear track. Spring force is small, the motor with fixed or waste. Spring is not good, no problem at that time, soon no power.
弹簧的主要尺寸公差
Spring's main size tolerance
1、弹簧内径的公差为内径基本尺寸D1的±1.0%。
1, the spring inside diameter tolerance for the inner diameter of the basic size of D1 + / - 1.0%.
2、弹簧的自由长度H0为参考尺寸。
2, spring the free length of H0 size for reference.
3、弹簧总圈数的公差为总圈数n1的±1.0%。凡手动车库门配套弹簧其总圈数应严格控制公差要求为总圈数的n1的±0.5%。
3, spring the tolerance of total number of laps for the total number of ring n1 + / - 1.0%. Form a complete set of all manual garage door spring the total number of turns shall strictly control the tolerance requirement for the n1 + / - 0.5% of total number of turns.
4、弹簧在自由状态下，应无初拉力，圈与圈之间间隙应小于0.2mm，以防止安装好后出现“S”形弯曲现象。
Four, spring under free condition, should have no pull at the beginning of gap between circle and circle should be less than 0.2 mm, in order to prevent the "S" shape after installed bending phenomenon.
5、弹簧负荷（单位：N）
5, spring load (unit: N)
a、实验负荷公差允许为使用负荷的±2.0%。
A, the experimental load tolerance to allow for the use of load plus or minus 2.0%.
b、弹簧承受负荷时的工作变形量必须在弹簧全变形量的40%～75%范围内选取。
B, spring work under load deformation must be in the spring the range of 40% ~ 75% of the deformation.
6、弹簧刚度（单位：kg/mm)
6, spring stiffness (unit: kg/mm)
弹簧刚度是单位工作负荷（长春门体总重量G）与总扭转度数（长春工业门体提升高度F）的比值。
Spring stiffness is unit work load (changchun gate G) total weight and total torsional degrees (F) of changchun industrial door hoisting height ratio.
弹簧安全疲劳寿命试验
Spring safety fatigue life test
1、弹簧经疲劳试验20000次不应发生断裂，试验后的负荷损失应不大于工作负荷的1.5%，扭转度数损失量不应超过总扭转度数的1.0%。
1, spring 20000 times should not break, the fatigue test after test load loss should be not more than 1.5% of the workload, torsion degree loss should not exceed 1.0% of the total torsional degree.
2、电动遥控自动门应有弹簧断裂保护装置：当弹簧断裂时，保护装置应能阻止长春门体下滑。
2, electric remote control automatic door should be spring break protection device: when the spring break, protective device should be able to stop the changchun door fall.