The door close device, also known as the hydraulic door close device, is a spring-like hydraulic device on the door head. When the door is opened, it can be compressed and released to automatically close the door. It has the function of a spring door, which can ensure that the door is accurately and timely closed to the initial position after being opened. The following is a detailed introduction to the door closers:
First, the working principle of the door closers
The door closing device is usually installed on the top of the door, and its working principle mainly relies on an internal spring. When the door is opened, the door body drives the connecting rod to move, making the transmission gear rotate and driving the rack plunger to the right. In the process of moving the plunger to the right, the spring is compressed, and the hydraulic oil in the right chamber is also stressed. At the same time, the check valve ball on the left side of the plunger opens under the action of oil pressure, and the hydraulic oil in the right chamber flows into the left chamber. When the opening process is completed, the spring releases the accumulated elastic potential energy, pushes the plunger to the left, drives the transmission gear and the door closing rod to rotate, and makes the door close. In the spring release process, the hydraulic oil in the left chamber of the door close is compressed, the check valve is closed, the hydraulic oil can only flow out through the gap between the shell and the plunger, and through the small hole on the plunger and the flow channel equipped with the throttle valve core to the right chamber. By adjusting the throttle valve, the hydraulic oil makes resistance to the spring release and realizes the control of the door closing speed.
Second, the classification of door closers
Door closers can be classified according to different criteria:
According to the driving method: can be divided into pneumatic, hydraulic, electric three, of which the hydraulic spring mechanism is the most common form.
According to the installation method: can be divided into external installation and hidden type. External door closers are usually installed on the top of the door and are the most common installation method. Hidden door closers may be embedded in the door body or door frame, which is more beautiful but relatively complex to install and maintain.
According to the direction of action: can be divided into two-way and one-way door closers. The two-way door closing device means that the door can be pushed and pulled open, and the door closing device can automatically close the door in two directions; The one-way door closing device means that the door can be opened only by pushing or pulling, and the door closing device can automatically close the door only in a single direction.
Third, the main functions of the door closers
Automatic door closing: The main function of the door closing device is to automatically close the door to the initial position after the door is opened through the compression and release of the spring.
Protect the door body: The door closing device can play a buffer role in the closing process to avoid damage to the door body due to violent impact.
Adjust the closing speed: the door closing device usually has the function of adjusting the closing speed, and the closing speed can be adjusted according to actual needs.
Fire performance: In some special occasions, such as commercial and public buildings, door closers also have fire performance, which can automatically close the door in case of fire and prevent the spread of fire.
Fourth, the application of door closers
Door closers are mainly used in commercial and public buildings, such as hospitals, schools, office buildings and other places, for automatically closing doors to improve the safety and convenience of buildings. At the same time, door closers have gradually entered the field of home decoration, providing more convenient and safe door control solutions for home users.
Fifth, the selection and installation of door closers
When purchasing door closers, you need to consider the width of the door, weight, frequency of use and whether special functions are required (such as automatic door stop, damping buffer, etc.). When installing door closers, operate in strict accordance with the product instructions and installation requirements to ensure that the door closers can work normally and play the expected effect.
In summary, the door closing device is a very practical door control device, with automatic closing, protecting the door body, adjusting the closing speed and other functions, in commercial and public buildings and home decoration fields have a wide range of applications.
