Where is the light curtain installed on the elevator door?

The elevator light curtain is installed on the car door between the hall door and the car door and fixed with screws.

Elevator light curtain is a kind of elevator door safety protection device based on photoelectric induction principle, which is suitable for all elevators and protects the safety of passengers entering and leaving the elevator.

The elevator light curtain consists of three parts: infrared transmitter and receiver installed on both sides of the elevator door and special flexible cable. For the need of environmental protection and energy saving, more and more elevators omit the power box. Some brands of light screens have to use power boxes because of their poor anti-electromagnetic interference ability. However, with the popularization of the concept of green elevator, the light curtain without power box is a trend. Because a lot of energy will be lost in the process of converting 220V to 24 V.

There are several infrared emission tubes at the emission end of the light curtain. Under the control of single chip microcomputer, the transmitting and receiving tubes are opened in turn, and the light from one transmitting head is received by multiple receiving heads to form multi-channel scanning. Through this continuous scanning of the door area from top to bottom, a dense infrared protective screen is formed. When any beam of light is blocked, because photoelectric conversion cannot be realized, the light curtain judges that it is blocked, so it outputs an interrupt signal. This interrupt signal can be a switch signal or a high-low level signal. After receiving the signal from the light curtain, the control system immediately outputs the door opening signal, and the car door stops closing and opens in reverse, so that the elevator door can be closed normally until the passengers or obstacles leave the warning area, thus achieving the purpose of safety protection, thus avoiding the occurrence of personal injury accidents in the elevator.

Under actual working conditions, the damage or instability of the light curtain is often caused by unstable voltage, poor grounding, ambient light interference, dust, water ingress and other reasons.

Therefore, in order to improve the trouble-free working time of light curtain products,

When designing the light curtain, please consider the following factors:

The protection level is IP65.

The light resistance of ambient light is above 100000 lux.

The light resistance of fluorescent lamps is above 3000Lux.

Metal shell, grounding-free design

Pass the electrostatic discharge test of at least 4000 volts.

Can withstand the instantaneous surge of1000 v.

Can withstand group pulses above 4000 V.