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。
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.
标准旁路开关，定期保养和维护时不用停电待产。
Standard by-pass switch, no need to cut down power and stop production for repair and maintenance of equipments.
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