Our factory mainly produces power switches. The following inspection procedures include: contact resistance detection, withstand voltage test between terminal and shell, hand feeling detection, etc. at present, it mainly relies on manual detection. According to the requirements of mechanical muffler, an automatic detection system is designed, which can include multiple stations, which can automatically detect, flow and screen out unqualified products, and inject qualified products into the next process. If the front muffler is required, a detection system is required to work for 8-10 hours a day, which can detect about 30000 products. After the success of the company, it needs 5 sets of automatic detection equipment and plans to invest 100000 yuan / set. At present, the world's advanced rapier loom is produced by Italy's picrano group. The loom is widely used in the key tire weaving equipment of automobile industry. The domestic tire cord weaving equipment in use is imported equipment, and the domestic tire cord weaving equipment in use has a large market space. The air jet loom produced by Zhangjiagang Panfeng Textile Machinery Co., Ltd. is the key equipment for weaving tire carcass material - cord fabric. Its electrical control system adopts three-phase AC frequency converter, which produces strong electronic interference to the external safety light curtain and weft controller of the loom, and seriously affects the stability of the loom. How to isolate or prevent interference is the focus of this project.