The safety of the elevator

 14/10/2020| View:59
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High-rise buildings are everywhere in daily life, and elevators are naturally the most frequently used transportation equipment. I believe that many people use elevators many times a day. Do you guys often worry about the unsafe elevators? After all, elevator accidents happen from time to time, and people are frightened to see them. Let’s take a look at how safe the elevators are today. After reading this, you don’t have to worry about it anymore. .

Elevators are generally divided into straight elevators and escalators. In recent years, escalators have been hurting people. However, compared with straight elevators, the escalator feels safer. After all, it is low and it runs naturally within the field of view. There is an extra sense of security. The passengers on the elevator are in a confined space and are not moving dozens of floors at all. It is inevitable that people will worry about it if they fall down.

1. The elevator wire ropes will not break at the same time

The steel wire ropes used in elevators are dedicated to elevators, and the country has special regulations and requirements. The configuration of the wire rope is not only to bear the elevator car and rated load, but also takes into account the size of the traction. Therefore, the tensile strength of the wire rope is much greater than the load of the elevator, and their safety factors are above 12. The focus is on Here, what does the safety factor of 12 mean? Simply speaking, if the elevator load is 1T, the minimum breaking force of the wire rope used by the elevator is 1×12=12T. The friends think that the daily operation is only 1/12 of the strength of the wire rope. How could it break? Usually elevators are equipped with more than four steel wire ropes, and they will stop running if they are overloaded with load protection, not to mention that even if they are overweight, it is a piece of cake for a steel wire rope with a safety factor of 12.

2. The elevator stalls during operation

Stalling during elevator operation generally refers to the acceleration or ascent of the elevator. The elevator's running speed should run within the specified rated speed range whether it is up or down. If overspeed occurs, there is an anti-overspeed device in the elevator control system (speed limiter, when the elevator speed exceeds 115% of the rated speed , It will act), at this time, the device will automatically act to slow down or stop the elevator.

 

3. When the elevator is running, it cannot stop, rush to the top or squat to the bottom

To prevent the elevator from running out of control, the steel wire is placed at the end, or the steel wire is wound at the top. This is controlled and protected by a stopper. The limiter is divided into upper limit and lower limit. If the elevator runs up and down to reach the upper and lower limit and there is still running posture, the limiter will act. The upper limit of the touch is restricted for upward movement, and the downward movement of the lower limit is restricted. Therefore, the elevator does not want to go to the sky.

4. Power failure during operation

If there is a sudden power failure during elevator operation or the elevator circuit breaks down, the elevator will automatically stop and brake safely. Because the elevator itself has safety devices such as machinery, electrical appliances, and safety gears, if there is an accidental loss of power, first the electrical and mechanical safety devices will stop the elevator from running, and secondly, the safety gear will block the running guide rails so that the elevator car is completely locked on the guide rails. . Moreover, the elevator has an emergency power supply. When there is a sudden power failure, there is enough power in the emergency power supply to allow the elevator to run for a short distance and send passengers to a safe floor.

5. Emergency device

The elevator emergency alarm device is a device that enables the trapped person to communicate with the outside world simply and quickly when the elevator fails and people are trapped. Elevator emergency alarm device is also called elevator five-party intercom. Five-party refers to the intercom host (generally located in the duty room), elevator car extension, elevator machine room extension, elevator car top extension, elevator bottom in the elevator intercom system Among the calls between the five parties in the pit extension, the one that has the closest relationship with the elevator passengers is the call between the car and the intercom host (duty room). When the elevator malfunctions and traps people, the trapped personnel only need to press the emergency alarm button in the elevator car, and the intercom host in the duty room will ring. At this time, the staff on duty can pick up the receiver to communicate with the trapped personnel. Talk about communication. There will be staff to rescue the trapped passengers.