Our factory purchased the LX616-1 type lathe in 1989. After less than one year of use, the main motor fan blade (Fig. 1) was broken more than 10 times. The reason was that the fan blade structure design was unreasonable and the fan blade was heavy. The turning inertia is large, and the strength of the parts is insufficient and damaged. At the same time, when machining the thread, due to frequent forward and reverse conversion, a large impact force is applied to the fan.
After the infection of the new coronavirus, the human nose, throat, hypopharynx, etc. will be "concurrently carried out". By collecting samples such as sputum of the nose, throat, and throat for human virus detection and testing, it can be determined whether the new coronavirus is worn.
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