The main varieties of door closers

A door closer is a device that can automatically close or fix an open door leaf in a certain position. Some have both the function of hinges and some have fire resistance. The main varieties include floor springs, door top springs, door slingshots, door makers, door clamps, magnetic door suction heads, etc Earth spring: also known as earth dragon. Installed under doors and windows. Made of gray cast iron, carbon steel, spring steel, cast steel, etc., and assembled into components Door top spring: an automatic closing device that uses the spring force of a spring or spiral spring to close the door leaf. Internally equipped with a buffer cylinder, it can reduce the closing speed.

Door slingshot: Made of low-carbon strip steel and equipped with low-carbon cold drawn steel top rod, it uses elastic force to close the door. Door brake: a convenient locator for braking door leaves and avoiding collisions between door leaves and walls. Installed at the lower outer corner of the door leaf, it can be positioned at any angle. Door clamp: a tool used to secure the opening of a door leaf. Composed of a blade shaped base and a triangular steel sheet chuck. There are two types: horizontal and vertical. The base is made of gray cast iron casting; The chuck is made of spring steel sheet and has a blue treated surface. Magnetic door suction head: The function is the same as the hardware head of the door clamp and door window. It uses the suction force of a magnet to fix the door leaf, and there is no noise during use.