Installation process of floor spring: First, draw a line to make the center of the floor spring shaft coincide with the door clamp shaft. According to the manual and the actual object, holes should be drilled on the ground, and the size of the holes should be tightly matched with the ground spring housing and not loose. Place the ground spring into the opened hole and straighten it. Lift the door leaf with the door clamp installed and insert the pivot of the floor spring into the pivot hole of the door leaf. Adjust the screws in the three directions of the floor spring to keep the door leaf vertical and to align the upper and lower rotation axes. Adjust the speed of closing the door. Cover the floor spring decorative cover.