Elevator trivia: What should I do if I am stuck in the elevator due to a sudden power outage in summer?

As a public facility that facilitates the movement of people, elevators are becoming more and more closely related to our lives. With the increasing intensive use of land nowadays, buildings in office areas, functional areas, and residential areas are getting higher and higher, and the installation and use of elevators has become essential. But while people enjoy the convenience of elevators, their knowledge of elevators sometimes stays in action movies and idol dramas. For example, they will explode, lose control, and free fall when entering the elevator, or the hero and the hero will have a mental breakdown in the elevator. The dramatic scene of picking up doors with bare hands. There are also many real cases in which people are trapped, the automatic brain-repairing elevator is out of control, falling vertically, and no one is spared, scaring oneself into collapse. Therefore, in order to fulfill the duties and obligations of special equipment popularization and guide everyone to correctly and safely handle hazards, we will introduce all kinds of knowledge about elevator safety in the form of question and answer. Today, we will conduct science popularization on the elevator trapped in a sudden power outage in summer. (The elevators discussed in this article are all commonly used traction-driven passenger elevators)

1. If there is a power outage in the unit district, will the elevator also be out of power?

Power will be cut off under normal circumstances. Sudden power outages in summer are generally caused by the increase in power consumption and power supply trips caused by the peak power consumption in summer, or the failure of power transmission and transformation equipment caused by extreme weather such as thunderstorms and strong winds in summer. However, after the main power supply fails, if the elevator is equipped with a backup power supply or a backup generator, or is connected to a high-level backup power system, the elevator can still operate normally after a power failure. Elevator supporting dual power supply system is very important for high-rise buildings, but it is also expensive. Therefore, even if residential buildings with more than 10 floors in the “Code for Electrical Design of Civil Buildings” should be designed in accordance with the second type of electrical load, they should have dual power sources (including common power sources and backup power sources), and the power supply will not be interrupted in the event of power or line failure. But there is no law expressly stipulating that elevators must be installed or connected to backup power sources. This has also led to the “Elevator Safety Management Regulations” issued by various provinces and cities. The “Elevator Safety Regulations of Heilongjiang Province” expressly stipulates that newly installed elevators and moving elevators should be equipped with video surveillance facilities, emergency leveling devices and backup. power supply. The “Suqian City Elevator Safety Management Measures (Trial)” does not explicitly stipulate that elevators must be equipped with backup power supplies.

2. Will the elevator lose control after power failure?

In the case of normal installation, use and maintenance of modern elevators, the probability of loss of control is very small. After the main power supply fails, if the backup power supply is not connected, the brake of the elevator will be in the braking state, so the elevator will brake suddenly and stop at a fixed position when the power fails.

If the elevator brake fails and the traction device is effective, it can still play a certain role in retarding the weight. The elevator traction rope is produced according to the calculation of a single rope that meets the rated load of the elevator. Generally, there are three to four elevators. If the traction ropes of the elevator are all broken, you will still not fall freely. The speed limiter of the elevator will rotate rapidly due to the fall. The centrifugal force of the throwing block is used to detect the speed. Pull the gear outside the arm, the pulley stops running, and triggers the action of the safety gear. The safety gear will be clamped on the guide rail to prevent the elevator from falling down uncontrollably.

If the safety gear fails, there are finally buffer devices located above and below the hoistway. The frictional force along the shaft and the air pressure at the bottom can be used for final remedial measures. Of course, the probability of using remedial measures is very small.

3. How to save yourself when trapped in power failure?
4. Keep calm, don’t be hysterical, and prevent emotional exhaustion;
5. Press the elevator alarm bell, emergency communication button, and dial the emergency rescue number in the elevator. If you can’t communicate, you can dial the fire protection;
6. Don’t kick the door frequently. When the communication method is invalid, you can make a sound for help. If no one responds, wait calmly;
7. Don’t force the door. Those trapped in the elevator cannot confirm the location of the elevator, and cannot predict the elevator movement situation;
8. Don’t climb out of the safety window. There are safety windows on the top of the elevator, which are only used by professionals;
9. In the event of an elevator crash, fix your position and squat your back against the inner wall, so that the entire back and head are close to the inner wall of the elevator in a straight line, using ligaments and knees to bear pressure.