The application of the wireless bridge in the video surveillance system has brought convenience to places where wiring is difficult. Digital cameras are installed in elevators. Wireless bridges are generally used, and video decoders are no longer used. Let's focus on wireless today. Bridge application in elevator monitoring.
First, the status of elevator monitoring industry
At present, most common elevator safety monitoring systems are serious traditional wired video surveillance systems. These systems use elevators to provide power for the relevant equipment inside the elevator, and transmit the monitoring video and accident alarm signals inside the elevator to the building. Security center to achieve a multi-purpose cable.
However, this model has one drawback. That is, with the continuous operation of the elevator, the cable will be constantly worn. If it is not maintained or replaced in time, it will cause cable breakage. Therefore, with the periodical update and maintenance of the cable, it becomes a cyclical work of the elevator, which increases the maintenance cost.
In addition, if the elevator fails due to breakage and breakage of the cable, the monitoring video inside the elevator cannot be transmitted back to the security center via the cable. The security personnel cannot obtain the situation inside the elevator from the monitoring system, which will hinder the elevator. The repairs and rescue work of the crew members trapped in the elevator car.
 Second, elevator monitoring industry needs
In order to solve the above problem that it is impossible to obtain video images in elevators due to cable breakage, wireless video surveillance systems are a good choice. The wireless video surveillance system transmits video signals through wireless microwaves. It has the advantages of easy installation, maintenance, strong anti-interference ability, and low maintenance cost. It eliminates the problem of being unable to obtain the internal monitoring image of elevators due to cable failures, and greatly improves elevators. The safety performance. The elevator wireless video surveillance solution contributes to improving elevator safety performance and ensuring the safety of elevator passengers. The following is the introduction of the elevator wireless video surveillance system:
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Third, the advantages of wireless monitoring system
Elevator wireless monitoring advantages
1 Simple installation, no wiring, and local conditions.
2 Short duration, time and effort, and simple maintenance.
3 wide range of applications, good stability, transmission distance.
4 high flexibility, easy expansion, not easy to fault.
Fourth, elevator wireless monitoring system structure
case analysis:
The main interferences that elevators are currently experiencing are:
1. Power interference: Since the power used by the elevator camera is taken from the elevator 380 volt power supply, and the elevator uses a variable frequency motor, it affects the camera and the transmission line;
2. Frequency-conduction motor interference: The video signal is a 0-6 mega-signal, and the frequency of interference generated by the variable-frequency motor is between 0 and 1 megabytes, causing direct interference to the video signal.
3. Interference from the controller to the video signal: The internal control part of the elevator (including actions such as opening the door up and down and closing the door) is a controller of about 11 megabytes. Once it is started, it will continuously send a control signal and a control wave of 11 megabytes. The control signal interferes with the video accompanying cable.
4. Interference of electric fan and light on the video signal: The internal lighting of the elevator adopts electronic oscillation lamp. The work of the lamp will lead to 50hz and a variety of derived frequency interferences, which will interfere with the video image;
Design:
This plan adopts 2.4G wireless bridge for elevator wireless security monitoring. The equipment has a high anti-interference ability, adapted to the elevator high-definition wireless video surveillance, to achieve high-quality transmission results.
The front end of the bridge is fixed on the top of the elevator car. The video signal in the elevator is transmitted to the transmitting bridge at the top of the car through the network cable. The receiving bridge is installed on the top of the elevator shaft and then it is connected to the back-end storage device. The entire elevator monitoring system can be completed.
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