Spring bolt monitoring mechanism and mechanical linkage lock

The utility model provides a spring bolt monitoring mechanism and a mechanical linkage lock, the spring bolt monitoring mechanism is applied to a coded lock with a spring bolt and a lock box to detect the unlocking state or the locking state of the coded lock, the spring bolt is arranged in the lock box and is provided with an unlocking end and a trigger end, and the unlocking end can stretch out of the lock box and can also retract into the lock box; the lock tongue monitoring mechanism comprises a travel switch and a controller, the travel switch is arranged outside the lock box, the travel switch and the trigger end of the lock tongue are located on the two sides of one side wall of the lock box respectively, a trigger rod extending out of the lock box is arranged at the trigger end, and when the coded lock is in an unlocking state, the unlocking end retracts into the lock box. The trigger rod can abut against a contact pin of the travel switch, and the travel switch outputs a normally-closed signal. The c