The door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be released after being compressed, and the door will be closed automatically. It has the function of a spring door, which can ensure that the door is closed accurately and timely to the initial position after being opened. .
Modern hydraulic door closers (referred to as door closers) began with a patent registered by the United States in the early 20th century. It is different from traditional door closers in that it achieves buffering by throttling the liquid in the door closer. . The core of the design idea of the hydraulic door closer is to realize the control of the door closing process, so that various functional indicators of the door closing process can be adjusted according to people's needs.
The significance of the door closer is not only to automatically close the door, but also to protect the door frame and door body (smooth closing).
Door closers are mainly used in commercial and public buildings, but also in homes. They have many uses, chief among them being to allow doors to close on their own to limit the spread of fire and to ventilate the building.
The factors that should be considered when choosing a door closer are: the width of the door, the frequency of opening the door, and the requirements and environment of use. The width of the door is the most important factor in choosing the door closer model. Common doors include fire doors, wooden doors, aluminum alloy doors, glass doors, steel doors, etc. Usually the weight of the door is small, the model with less force is selected, and vice versa. The frequency of opening the door is a factor closely related to the quality of the product. For occasions with frequent use, it should be required that the product has better sealing performance and long service life.
1) Whether there is an automatic door stop function after opening the door;
2) Damping buffer function - damping buffer is generated after the door is quickly opened to a certain position, and the strength and range of the damping buffer can be adjusted according to the requirements of use; this function is used to prevent the door or lock from hitting the wall when the door is opened quickly, or emergency escape It can prevent people from losing weight and leaning forward and falling to the ground when opening the door quickly.
3) Delayed slow door closing - the door starts to close slowly at a constant speed from the maximum position of the door opening, which can be adjusted steplessly according to requirements. It is suitable for use in places with frequent access and many people, especially hospitals, doors and passages for the elderly, children and the disabled.
4) The door closing force can be adjusted - it can be installed on different doors with a wide range of door weight and door width, as well as in places where the door closing resistance is large due to environmental reasons. Random stepless adjustment can obtain satisfactory closing force, especially in coastal cities, vehicles and ships, etc., where the closing resistance (the force of the door) changes frequently due to the influence of wind.
5) Temporary closing performance of damping reset function (vertical door closer) - When opening at any angle, closing the speed control valve should be able to temporarily suspend the damping reset function.
6) Safe and fast super-damping closing performance (vertical door closer) - when an external force is suddenly applied in the process of closing any angle, it should be able to close safely and quickly.
7) Use environment: fire protection requirements and antifreeze requirements for places under minus 35° in winter.
