Automatic fire door closing device and system

An automatic fire door closing device, comprising a door closer body for fixing on the door to close the door, an arm rod rotatably driven by the door closer body, a connecting plate for connecting with a door frame, and a clamping device capable of keeping the door open after being opened, the arm rod and the connecting plate being rotatably connected via a rotating shaft, one of the arm rod and the connecting plate being provided with the clamping device and the other one being fixedly connected with the rotating shaft, wherein, the automatic fire door closing device further comprises a fire monitoring and response device, and a driving device cooperating with the fire monitoring and response device and the clamping device;

• the driving device comprises a transmission column rotatably connected to the connecting plate, a transmission rod connected to the transmission column, and a linkage rod rotatably connected to the connecting plate and rotating in response to the fire monitoring and response device;
• the transmission column and the clamping device are connected to drive the clamping device to prop against or release the rotating shaft;
• one end of the linkage rod has a hook part which hooks the transmission rod when the door is in an open state, and disengages from the transmission rod when the fire monitoring and response device detects smoke or open fire, and the transmission column is released to allow the rotation of the rotating shaft, and the arm rod and the connecting plate draw close to each other.