Fire door above a very practical and very indispensable component, is the door closure, so how does the door closure work after all?
How does a fire door shutter work? When opening the door, the door body drives the connecting rod to make the transmission gear turn and drive the rack plunger to move to the right. As the plunger moves to the right, the spring is compressed and so is the hydraulic fluid in the right chamber. The check ball on the left side of the plunger opens under oil pressure and the right chamber hydraulic oil flows into the left chamber through the check valve. At the end of the door opening process, the spring is compressed during the opening process, the accumulated elastic potential energy is released, the plunger is pushed to the left, the transmission gear and the door closing connecting rod are driven and rotated, and the door is closed.
