Door closer

A door closer, comprising:

• a first connecting plate and a second connecting plate,
• wherein the first connecting plate is connectable to an external door frame, the second connecting plate is connectable to a door body connecting portion,
• wherein a connecting rod assembly and a return spring are mounted in the door body connecting portion,
• wherein one end of the connecting rod assembly passes through the second connecting plate and is hinged to the first connecting plate,
• wherein when a door is opened, an external door body drives the first connecting plate and the second connecting plate to rotate, and after the connecting rod assembly pulls the door body connecting portion, the return spring is compressed, and
• wherein when the door is closed, the return spring pulls the door body to close automatically,
• wherein the door body connecting portion further comprises a housing, and a base is mounted in the housing,
• wherein a plurality of guide sliding blocks are symmetrically disposed at one end of the housing, and the plurality of guide sliding blocks are fixed to the second connecting plate,
• wherein a hydraulic rod is further mounted in the housing, and
• wherein a sliding groove is further disposed on the housing, and the base is placed in the sliding groove.