A lock pair first structure that it is quick -witted that is used for screw lock to pay

The utility model relates to a lock pair first structure that it is quick -witted that is used for screw lock to pay, including the chuck, the dop pass through locating pin, screw and the chuck is connected go back the coupling spring between the tip of dop and the chuck the inside of chuck is mounting sleeve still. The utility model discloses simple structure, simple to operate utilize the utility model discloses it pays the machine and carry out the mark to the screw defective products when the operation is paid to the lock effectively to have realized the lock to the phenomenon of avoiding in the past finding out the screw defective products after the assembly takes place, has improved assembly efficiency greatly.