Since the elevator is controlled by a microcomputer, when the computer detects that there is a fault or generates an abnormal signal, the computer will issue an emergency stop command, and the system will immediately decelerate or stop the running elevator. This will cause the elevator to suddenly shake and drop floors.

　　In addition, if the elevator leveling sensor fails, it may cause the elevator to stop at the wrong floor. After the elevator computer system detects a fault, it generally controls the elevator to automatically return to the base station floor (usually the first floor), which will also show the illusion of the elevator falling uncontrollably.

　　But if all the elevator ropes are broken and the car really falls out of control, don't worry too much. The elevator also has a speed limiter and safety gear.

　　Speed limiter The

　　elevator is equipped with a speed limiter, the wire rope of the speed limiter, the rope head and the car are fastened together, and connected with the safety gear through a mechanical link.

　　When the lift or fall speed of the car exceeds the upper speed limit set by the system. The speed limiter will detect that the elevator is overspeeding, and the roller will be stuck to prevent the elevator from falling. At the same time, the safety gears distributed on both sides of the car are activated to form a linkage effect, and the safety gears extend to firmly clamp the elevator on the running track.

　　Safety gear

　　In addition , the designer also took into account the problem that the elevator motor cannot run in the event of a power failure, so an elevator holding brake device was specially designed. After the elevator loses power, the elevator holding brake device will brake the motor under the action of the spring, so as to achieve the purpose of "braking" and prevent the elevator from falling down.

　　Even if all the wire ropes are broken, the speed limiter and safety gear protection mechanisms are destroyed, and the motor holding brake is deactivated, the elevator we ride still has a protective measure. There are buffers installed at the bottom of the elevator shaft, and these buffers use springs and hydraulics to reduce the impact force.

　　Buffer

　　When the elevator falls to the bottom, the buffer is impacted by the car. According to the principle of force reaction, a force in the opposite direction will be applied to the car to achieve the purpose of slowing down the impact and absorbing energy.

　　Jump up, can't avoid injury

　　Having said so much, there must be people who want to use the "jump" method to avoid the injury caused by the elevator falling.

　　It's basically impossible to jump up and avoid damage the moment the elevator hits the ground.

　　Because the elevator will be affected by gravity in the way of falling, the higher the floor of the elevator, the greater the impact force on the car. Assuming that the car falls from a height of around the 15th floor, even if you jump up at the last second, your own falling speed is only reduced from 120 kilometers per hour to 100 kilometers per hour. Contacting the ground at these two speeds is actually indistinguishable from the point of view of harm to the human body.

　　Moreover, we are in a state of falling weightlessness in the car, and we cannot take off. And we can't judge where the elevator is, and it's basically impossible to jump up at the last second. If it really jumps up, but the elevator does not reach the end, it may also be hit on the head by the falling elevator car, causing more damage.

　　Moreover, there are basically no falling accidents now, and more of the elevator car rises rapidly and breaks through the top floor. The damage from a top run can sometimes be more terrifying than a fall.

　　When the car hits the roof, people will be lifted up by the huge impact force, and our heads will hit the roof of the car. When we find that the car is rising rapidly and uncontrollably, we must curl up against the corner and hold the head with both hands to reduce the impact on the head. When faced with this situation, jumping up will only make you die faster.

　　Rules for

　　taking elevators When taking elevators, we also need to pay attention to some problems.

　　Don't play and jump in the elevator, and don't press the buttons on all floors of the elevator for fun, which will not only delay other people's time, but also have potential safety hazards.

　　When the elevator door is about to close, don't reach out to block it. Sometimes the elevator's sensor can't sense the extended fingers, which will cause the fingers to be pinched. The correct way is to hold down the elevator door open button and use the mechanical control to open and close the elevator door.

　　When things such as children's traction ropes enter the elevator, be sure to carefully observe whether they are caught in the gap of the elevator. If the elevator starts to be noticed, it will cause damage to the person or object behind the traction rope, and may also cause the elevator to malfunction and cause an accident.

　　Nothing is absolute, and elevators cannot be guaranteed to be absolutely safe and reliable, which requires us to protect ourselves in the face of extreme environments.

　　Self-rescue

　　When encountering an elevator failure, you must keep a clear mind at the first time, and don't panic or make a mess.

　　Look for the elevator emergency call button. Each elevator has the same "document number" as the person. Tell the emergency contact personnel of the number, and they will send professionals to come to rescue.

　　When the elevator is in failure, do not force open the car door. The gap between the outside of the car door and the elevator shaft is only 10 cm, and it is impossible for a normal person to drill through the 10 cm gap. Even if you drill out, you will reach the elevator shaft, which is more dangerous than the inside of the car.

　　When the elevator car is in the middle of two floors and the car door can be opened, do not try to go out halfway between the doors. Once the elevator starts when you are going out, you are likely to be cut in two by the elevator.

　　If the elevator is descending rapidly, take out all the heavy objects on your body and throw them underground. Items can increase the impact force on the human body, making the injury more serious.

　　Immediately close to the corner of the car or the wall to fix the body, the body is in a semi-squatting position, and the back of the head and neck are covered with both hands. If the body is not stable, you can use one hand to support the wall to maximize the contact area between the body and the wall.