The test provides a quantitative evaluating index for safety storage with overload coefficient.
试验中还通过超载系数，提供了一个安全储备的定量评估指标。
Every machine is equipped with protect travel switch in order to increase safety coefficient for repairing and maintenance. It also has thermal overload relays to protect the motor.
每台机器均配有保护行程开关，为维修、保养增加一份安全系数。且装有热过载继电器，保护电机。
But when surcharge preloaded, the coefficient will change with the overload ratio and its duration time.
而当超载预压处理后，次固结系数随超载比和超载作用时间不同而变化。
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