When the plug is pulled out from the adapter (40), the shielding door (4) rotates under an action of the torsion spring (5), and the back (43) of the shielding door (4) is placed against the front end of the plug core component (3), achieving automatic shading and dust prevention; when the plug is inserted into the adapter (40), the plug core component (3) pushes the shielding door (4) to rotate to open, enabling the plug to be plug and play.
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