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Shaanxi Sanjin Elevator Fittings Co.,Ltd.

Light Curtain

Advantages

Product Introduction


In order to prevent the passengers from being injured when they are going into or out of the elevator, the safety detection system is set in the elevator control system .There are two common types of safety detection systems: contact detection device is mainly based on safety edge, and a non contact detection device includes photoelectric detection device, ultrasound monitoring device, electromagnetic induction detector and infra red light curtain detector.

elevator door protection product: Light curtain(Door Detector/ Door Sensor) .
Light curtain as an electronic product, the reliability of optical screen also depends on its electromagnetic compatibility, and its strong electromagnetic tolerance is a key index to measure its reliability.


【International and Regulatory Requirements

 
A protective device should automatically re-open the door when a passenger is struck or will be struck by a door leaf as he/she passes through the entrance of the car while the door is closed.


Product Structure


Light curtain is a door system safety protection device and composed of three parts:
1.The infrared transmitter
2.Receiver installed on both sides of the elevator car door
3.The special flexible cable.


Product Working Principle


There are several infrared transmitting tubes inside the transmitting end of the optical screen.
Under the control of the micro-control unit, the transmitting receiving tube is opened successively, and the light emitted by one hair color is received successively by multiple receiving heads, forming a multipath scan.
It will be formed a dense infrared protection screen through this top-down continuous scanning car door area. When any beam of light is blocked, because the circuit at the back end of the receiving head cannot realize photoelectric conversion, the light curtain is judged to be blocked, so an interrupt signal is output to the portal machine. This interrupt signal can be a switch or a high or low level signal. After receiving the signal given by the light curtain, the elevator door machine will immediately output the opening signal, and the car door will stop closing and reverse open, and the elevator door will not close normally until the passenger or barrier leaves the warning area, so as to achieve the purpose of safety protection and avoid the occurrence of the elevator sandwiching accident.


The above mentioned principles of the elevator screen work have several basic concepts

 

First of all is the quantum efficiency of photoelectric.
There are two technologies to choose from, CMOS and CCD.
Anyone who has ever played with a camera knows these two terms.
Generally, the camera in a mobile phone is CMOS, while the camera in a digital camera is CCD. The CCD technology is complex, so the cost is definitely higher than that in the case of the same resolution. CMOS has a feature. Under good light, the quantum efficiency of photoelectric conversion is high, but if the light is bad, the conversion rate is low, and the imaging quality is sharply reduced. So phones that use CMOS cameras lose image quality dramatically at night. Limited to the cost relationship, infrared screen receiver head is used in CMOS technology. The direct result of low efficiency of photoelectric conversion is that the screen is easy to misjudge. In order to improve the efficiency of photoelectric conversion, the common solution is to increase the transmission power. The transmitter head is easy to damage under high power condition.

 

Another concept is the number of eyes and the number of beams. Many people now judge the quality of the screen simply by the number of beams, and many tender documents simply say “require more than 150 beams”. This is actually a wrong idea. Light eyes, usually in pairs, one launch, one reception. The light curtain USES the scattering principle to realize multipath scanning. Due to the scattering property of light, the light emitted by one emitter can cover up to five receiving heads at a distance, scanning one by one. Of course, the top end and the bottom end of the hair receiving head, there will be three beams of light because of the scattering Angle of the physical reasons can’t receive. So 16 of the first 5 scans minus 3 of the top and the bottom 3 of the top is 16*5-6=7


【Product Type】


Brand

Type

Model

SANJIN

General Elevator Light Curtain 

SJ-NB96AL1-I220FW

WECO

Infra Red Elevator Door Detector

WECO-917A61-AC220

Hitachi

Elevator Door Photocell

FCU0647CN01/CN02

KONE

Elevator Door Photocell

FCU0740 FCU0735

Mitsubishi

Elevator Door Photocell

MBS-S100

CEDES

Elevator Light Curtain 

RXTX-2000-16BCK

 

As the protective device of the door system, the most important evaluation factor is reliability.

1.The IP rate
2.Anti-interference ability
3.Light resistance

Our service staff is ready and available to take your calls and work on your project with you.
Please contact us as quickly as possible.


WECO 917 957
Technical Features
Number of infra Red Diodes 17 Diode sets 32 Diode sets 17 Diode sets 20 Diode sets 32 Diode sets 36 Diode sets 40 Diode sets 48 Diode sets
Response Timo 45ms
relay output
61ms
relay output
45ms
relay output
48ms
relay output
61ms
relay output
65ms
relay output
69ms
relay output
77ms
relay output
21ms
transistor
output
37ms
transistor
output
21ms
irensistor
ouput
24ms
transistor
output
37ms
transistor
ouput
41ms
transistor
ouput
45ms
transistor
output
53ms
transistor
output
Scanning Boams 94-33
Beams
154-94
Beams
94-33
Beams
128-58
Beams
154-94
Beams
174-106
Beams
194-118
Beams
234-142
Beams
infrared diodes range 117.5mm 58.8mm 117.5mm 84mm 58.8mm 47.5mm 47.5mm 40mm
Detecting Hleight 20-1841mm 20-1615mm 20-1841mm 20-1678mm 20-1868mm 20-1900mm



SANJIN general elevator light curtain
Technical specifcations
Model SJ-NB96-A SJ-NB154-A
Number of diodes 17 Pairs 32 Pairs
Distance between diodes 118 mm 59 mm
Maximum beams(distance>400mm) 96 Beams 154 Beams
Minimum beams(distance<400mm) 33 Beams 94 Beams
Highest bearm >1840mm
Lowest bearm ≤20mm
Size 10mm (thickness) x24mm (width) x 2000mm (height)
Detecting distance 0-4000mm
Vertical displacemen tat 0mm ±20mm
Horizontal displacement a t0mm ±3mm
Angular displacement at 50mm ±10°
Cable reliability 20 million door moverments
Light imunity ≥100,000LUX
EMC compliance Emissions to EN12015, Immunity to EN12016
Operating temperature range -20℃~+65℃
IP Rating IP54
Vibration test The vibration frequency is10-55Hz,the amplitude is 0.75mm,Vibration direction X.Y,Z three axial each 50min
Respones Time(NPN or PNP) 45ms 65ms
Respones Time(Relay) 60ms 80ms