This paper introduces a screw nut automatic tightening device. By screwing, detection and other devices, the screws and nuts of the circuit breaker are tightened automatical y. It is significant beneficial to reducing the energy consumption, improving the production efficiency, saving the cost.%介绍了一种断路器螺钉螺母自动拧紧装置，通过旋紧和检测等机构来实现断路器螺钉螺母的自动拧紧。在降低能源消耗、提高生产效率、节约经济成本等方面有着显著的效益。
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