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Elevator Manufacturer Designs Elevator Safety Devices

Elevator Manufacturer place great emphasis on the safety of elevators when designing elevators, and many safety equipment and systems have been designed for elevators.

Hall door and door

In order to start the elevator, an important condition is that all hall doors and doors must be closed. As long as a door is not closed, the elevator will not start. This is because mechanical and electrical interlocks are installed on each door. If the door is not closed, the circuit will not work and the elevator will not start. In general, the elevator is equipped with an automatic door lock. When the door is closed, the lock arm is inserted into the switch box and the lock arm head is moved upward to push the travel switch contact to open the elevator control circuit. The vehicle can only be driven when the electrical contacts on all doors are connected. car.

Overload test

Before the elevator is completed, the elevator has been overloaded, that is, when 110% of the rated load is added to the car and the overload protection circuit is energized 40%, the reciprocating operation reaches 30 times in the full stroke range, and the elevator can reliably start up. If it runs, stops, and all components are normal, it can be transferred. This test guarantees the normal operation of the elevator in the future.


If all of the above safety devices fail (which may be rare), the safety of the elevator is ensured by the last safety device buffer when the elevator car or counterweight is flushed into the pit. The damper is installed in the pit of the hoistway, generally three, two are installed at the bottom of the corresponding vehicle, and one is installed under the counterweight. The buffer is divided into a spring buffer and a hydraulic buffer. When the car or counterweight is pressed against the shock absorber, the shock absorber is deformed by the pressure, causing the car or counterweight to bounce, and after the bounce is repeated, the car or counterweight is buffered, and finally the stationary state does not come. Counterweight buffers also avoid car collisions. Before the car gets on the bus, the counterweight frame hits the counterweight buffer to avoid the danger of the car hitting the floor of the machine room.

Independent lighting and power lines

When the elevator fails, the power must be turned off in order to stop the elevator. However, only the power is turned off to make the elevator inoperable. At the same time, it is necessary to ensure lighting, ventilation and alarm devices in the car to prevent the elevator from being powered off. The car is dark and unable to communicate with the outside world, causing passengers to fear and panic. In addition, to ensure the slot on the car, the lighting socket in the machine room, and the electricity in the hoistway lighting, so the light on the wall of the hoistway is bright, when people pick up the car through the safety window, the accident ENT can be avoided.

Posted by: fujielevators 12.11.2018 12:15:14

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