Do you still have "hundred thousand why" questions about the novelty of life? Do you have the confidence that "every day is a new day"? If you feel that the novelty of life is gradually disappearing, think of the world's You can see everything at a glance. Then you are wrong. Here is a question: Do you know what a door closer is?

Maybe you will be wise to answer my question confidently by pointing to the door closer to the door leaf. It is true that this question did not fail you, but don’t be too happy. Next, I will ask: this little one on the top of the door leaf Why can the door be closed easily? Is there electricity to support its operation? I am afraid that is not the case.

　　 Now let me open the mystery to you. Take the S4A DL-60 door closer as an example. The door closer is actually a mechanical device that can automatically close the door through mechanical principles. The door closer is a spring-like hydraulic device. When you manually push the door open, the spring in the door closer is compressed to store energy, and then the spring is released through the spring, and the closing force is transmitted to the door leaf through the door closer rocker arm. The door closes automatically without external force. The cylinder body where the spring is located in a well-designed hydraulic system with hydraulic oil enclosed in it. Through this hydraulic system, we can well control the door closer to achieve various adjustments to meet people's needs.

The DL-60 door closer has a simple and clean silver finish, rocker arm, and cylinder, but in fact, the door closer is not as simple as we seem to be. The internal structure of the door closer is a secret world that operates at any time and runs stably. Its interior is composed of racked pistons, springs, oil control valves, balls, oil circuits, and filled hydraulic oil, etc., with excellent airtightness as a whole. Design makes hydraulic

It is impossible for the oil to leak out. How do these complex little things cooperate with each other? Then let us take a look at the internal structure of the engine as the door closed through the picture.

Having mastered the above knowledge, you can convey these to your friends, but the secret of the door closer is more than that. In addition to the basic function of automatic door closing, different door closers have different adjustment options and special features. Features:

　　1. Adjustable door closing speed: the trajectory of the door leaf closing is a 90-degree arc. The area where the door closing speed can be adjusted is generally in the range of 10 degrees to 90 degrees when the door leaf is opened.

2. The locking speed is adjustable

　　 The door you see is closing the last 0-10 degree area. The speed at which the door is closed in this area is called the lock speed. The door closer with adjustable locking speed has a locking speed regulating valve. Through the regulating valve, it enables you to adjust the closing speed to ensure that any bolt can enter the lock plate to complete the locking action.

　　3, door opening buffer function

　　 Advanced door closers usually have a door opening buffer function so that when the door opening force is too strong, it will not hit the adjacent wall due to the too fast door opening speed.

4. Delay function

The delay function prevents the door closer from closing automatically immediately. For example, when you push a trolley or a heavy object through the door leaf, the door body can be delayed for a few seconds before returning to its normal closing speed, which makes it easier for people to pass through. Compared to the normal closing time of 5-10 seconds for most doors, The door closer can be adjusted to a delay of two minutes or more.

5. Doorstop function

　　 This seems to contradict the requirement of the door closer to close automatically. However, using this function may be useful in certain situations, such as the loading area where the door needs to be temporarily kept open at a certain moment. We usually do this through the doorstop block on the door closer arm. When we set the doorstop angle, the door leaf will stop when it is opened to a specific angle. When the angle is exceeded by manpower, the door will return to the automatic closing state. . But please note that door closers with stop functions are forbidden to be used on fire doors!

　　6, the force level is adjustable

The force level of the door closer determines the applicable door width and weight. At present, door closers on the market usually adjust the force level by adjusting the length of the spring and the installation position. There are usually 1 to 6 forces, the greater the force level can be applied to wider and heavier doors. One type of door closer on the market is a fixed-force door closer. Such as fixed force level 3 or force 4. This means that they are fixed to fit doors of a certain width. Another type of door closer is adjustable in force level, suitable for a series of door widths, such as the door closer with adjustable force from No. 2 to No. 4.

Now when you have read the above introduction to the principle and various functions of door closers, you are already an expert on door closers! However, knowledge is endless. It is better to observe and feel the operation of door closers. If there is anything you don’t know, S4A will always be your think tank and will accompany you.

Author: Written by Mr.Andy Zhang from S4A INDUSTRIAL CO.,LIMITED