There are more than 300,000 elevators in our country, and we need about 50,000 a year. The elevators must operate 24 hours a day. The safe operation of elevators is of the greatest concern to the people.
There are two factors that affect the safe operation of an elevator. First, the quality and reliability of the elevator system. Second, human factors cause personal safety in the elevator car.
For a long time, elevator intercom mainly adopts the bus-based intercom system, which is one of the mandatory requirements for the safe operation of elevators. However, with the popularization of video surveillance systems, newly installed elevators have begun to install video surveillance and improve the safety of elevator operations.
The installation of video surveillance in elevators is often faced with the problem of video interference because elevator motors are accompanied by strong electromagnetic radiation signals that can cause disturbances in video surveillance images. In order to solve the video interference problem, the factory will use a video anti-jamming device.
This article describes the elevator video alarm intercom linkage system, in the practical application of the new and old systems in engineering and users. It only needs to pass a single video cable to achieve video surveillance image transmission, alarm signal transmission, audio and video intercom signals, and video anti-jamming capability. This kind of stable and reliable non-bus transmission structure, reliable alarm mode, high-quality audio broadcast intercom way, automatic switching of video linkage function of alarm elevator image when alarming, greatly improving elevator safe operation, reducing cable material, shortening The construction hours reduce the system cost.
Elevator video alarm intercom linkage system elevator video alarm intercom linkage system has applied for the invention of the patented new technology, does not require the laying of cables, the use of elevator video surveillance cable not only transmit video surveillance signals can also transmit alarm signals, audio intercom, through The SCM control technology and the computer management software realize the video alarm intercom linkage control, which can realize the networking control of 128 elevators.
System Working Principle The core equipment of the video linkage control system is a single-channel audio and video control modulator (abbreviation: modulator), 8-channel audio and video linkage controller (abbreviation: controller), video linkage switcher (abbreviation switcher), management Computer composition. With the pickups, broadcast horns, and radio amplifiers, an elevator video alarm intercom linkage monitoring system can be formed.
Audio and video transmission. The use of cable TV audio and video signal transmission technology, the camera 0 ~ 6MHz video signal modulated to 49.75MHz above the high frequency band, the use of coaxial cable 0 ~ 1GHz bandwidth to transmit audio and video signals. This kind of transmission method is the same as the video anti-jamming device and the common cable, and the high-frequency signal sent by the modulator is demodulated by the controller's demodulation module.
Alarm signal transmission. Adopted the new technology that has applied for the invention patent, using the low frequency band of the coaxial cable, the alarm button in the elevator, directly using the universal normally open alarm mode, using the video cable to directly send the alarm signal to the terminal controller, and the controller Send alarm data to the management computer.
Broadcast signal transmission. Place a passive broadcast horn in the elevator and connect it to the modulator. The management computer issues instructions to the controller, and the broadcast signal is transmitted through the video cable to the elevator speaker.
System control. The system adopts RS232 and RS485 control mode to realize two-way data communication between the computer and the controller and the switcher. The functions of the system are realized by the microcontroller and the management computer in the controller. The system can connect up to 16 8-channel audio and video linkage controllers to realize video, alarm, audio intercom and control linkage of 128 monitoring points.
System implementation function 1 When the alarm button in the elevator is pressed, the video image of the alarm elevator and the sound in the elevator are automatically switched and displayed on the elevator monitor in the monitoring room. The controller has an alarm sound.
2 Switching the broadcast signal can achieve voice intercom with the elevator.
When 32 or more elevators are at the same time alarming, the computer can display 2 or more alarm prompts at the same time and automatically switch to the latest alarming elevator screen to realize intercom.
4 Monitor elevator and alarm intercom detection. The video image of each elevator can be switched and displayed through computer management software at ordinary times, and the monitoring image and intercom function can be detected through intercom feedback.
5 Three-way intercom or five-party intercom. The cable of the five-way intercom can be connected to the video cable. When a multi-party intercom needs maintenance and maintenance of the elevator, a simple intercom device or a small-size telephone exchange can be connected to realize multi-party intercom.
6 For high-grade elevators, the elevator's operating data needs to be transmitted to the monitoring room terminal equipment, and remote control of the elevator can be realized, so that the elevator operation is more reliable and the elevator fault can be solved more conveniently and quickly. Adding controllers in the elevator can transmit elevator controller operation data to terminal equipment and achieve remote control.
The main equipment in each elevator car is: audio and video control modulator (abbreviation: modulator), alarm button, pickup, broadcast horn, camera.
1 Install the audio pickup in the elevator car control board and connect the audio output to the modulator. The volume can be adjusted with the volume adjuster on the pickup. The pickup head can choose either built-in microphone or external microphone.
2 The elevator alarm button is connected to the alarm/broadcast control port on the modulator. The alarm signal is transmitted directly to the terminal equipment through the transmission cable.
3 The passive broadcast horn is connected to the alarm/broadcast control port on the modulator. After the alarm signal is received, the terminal device gives a broadcast signal to implement audio two-way intercom. If the broadcast horn breaks, it will automatically send an alarm signal.
4 The camera is connected to the video input port on the modulator.
5 The transmission cable connects to the RF output port on the modulator.
6 modulator power supply and camera, DC12V.
8-channel audio and video alarm linkage controller installed in terminal equipment (abbreviation: controller)
It can communicate with 8 elevator car in-cell modulators.
8-channel audio and video alarm linkage controller 18 elevator car video transmission cable is connected to the 8-channel video input port.
28 video outputs and 8 audio outputs are connected to the hard disk recorder.
More than 3 networked use, audio and video output connected to the audio and video control signal switch.
48 alarm test ports for testing alarm functions.
5 RS485 and RS232 communication ports, multiple stations use RS485 communication, and single station uses RS232 communication.
6 When used in a single station, COM connects to the audio output of the broadcast amplifier. Connected to audio and video control signal switcher when connected to the network.
Realization function: Receive 8 audio and video signals at ordinary times and output them to the hard disc recorder. When the alarm signal appears, the alarm indicator is on. The audio and video output is switched to the audio and video image of the alarm elevator. The broadcast audio signal is automatically connected to the elevator transmission cable and transmitted to the speaker connected to the control end of the front modulator. , alarm, intercom.
1 When multiple controllers are used in a network, it is necessary to switch out the audio and video images of the alarm elevator with the switch, and switch the broadcast signal and the telephone signal to each controller.
2 The audio and video output of each controller is connected to the switcher, and the audio and video output is connected to the TV wall monitor.
The 3JK1 port is connected to the audio output of the broadcast amplifier. JK2 port received the telephone signal for elevator maintenance. The COM port is connected to the COM port of each controller and outputs a switching signal to each controller.
4 through RS485 or RS232 and computer connection, there is a computer software control system.
Transmission distance audio and video control modulator can choose from CH1, CH2, CH3, CH4, CH5, and the output level is 115dB. The receiver's audio and video demodulation module has a receive sensitivity of 55dB. The difference between input and output levels is 60dB.
The national standard SYWV75 and SYV75 cable attenuation meters per 100 meters according to the above table, use CH5 channel modulator, using SYV75-5 cable transmission, loss of 8.1dB per 100 meters, theoretically can transmit 740 meters, taking into account the actual application of the loss 80% calculation, at least 590 meters can be transmitted. Select cable TV cable SYWV75-5, loss 4.6dB per 100 meters, theoretically can transmit 1300 meters, taking into account the actual application of the loss calculated by 80%, can transmit 1000 meters.
The computer management software elevator alarm intercom video linkage system can be used alone or in conjunction with the community perimeter alarm, burglar alarm, access control, and video wall management to form a comprehensive video linkage system.
The system can realize the video linkage of up to 128 monitoring points. Besides the elevator alarm intercom, it can also realize the video linkage of perimeter alarm, burglar alarm, and access control, and is managed with unified management software.
In the video alarm linkage control system, each elevator controller can control 8 elevators. The system can connect up to 16 controllers. When the person in the elevator presses the alarm button, the audio and video monitor will automatically switch to the image of the alarm elevator, hear the sound in the elevator, select “relay 1†to turn on the broadcast signal, and realize the intercom. The audio input of the radio amplifier is connected to the audio output port of the computer, and the microphone connected to the computer is used for dialogue.
In addition to implementing video alarm intercom in elevators, video peripheral alarm linkage and video access control linkage can also be implemented. The signal of JK1 is controlled by "relay 1", the signal of JK2 is controlled by "relay 2", and the signal of JK3 is controlled by "relay 3". JK1 ~ JK4 can receive 0 ~ 120V broadcast signal, telephone signal, RS485 signal, 0 ~ 12V power supply, to achieve different needs.
Integrated monitoring system management platform includes video alarm linkage control system and video wall control system. The integrated video linkage control system basically satisfies the main requirements of security protection. Each subsystem can be applied independently or integrated. It is compatible with existing alarm detectors, access control devices, hard disk video recorders and other equipment, enhances the effectiveness of security protection, reduces the cost of the system, and is suitable for the reconstruction of new and existing systems.
System Installation and Construction Applicable Conditions and Precautions The Video Linkage System is based on a video surveillance system using coaxial cable transmission and is suitable for retrofitting and new systems of old systems. According to the application of this system in the actual project, the following matters are noticed for the new system and the reformed system.
The newly-established system uses a SYWV75 CATV cable to create a new system transmission cable. Its other major feature is the use of F-joints for cable joints, eliminating the need for on-site welding and facilitating on-site construction.
Because the transmission characteristics of high-frequency signals and low-frequency signals are not the same, the construction specification is required to be handled, and the cable connectors must be handled well. There should not be too many connectors. If the cable connector is handled improperly during construction, excessive connectors are often the main cause of image quality problems.
The monitoring system of the existing old system renovation project has generally adopted the SYV75 video cable. When it is converted into a video linkage system, it does not need to re-lay cables. However, the original laid cable must be carefully tested to ensure the successful completion of the project transformation.
The problems that have arisen in undertaking the transformation of the Beijing Boya Xiyuan old system are mainly cable connectors. During the construction, it was found that there were too many non-standard cable connectors, and some of the connectors were immersed in the water. These problems caused the video image to be ineffective and had a greater impact on the RF signal.
Concluding remarks What are the real needs of security and the goals to be achieved? The first is “preventionâ€. Reliable and advanced security facilities can effectively prevent the occurrence of security accidents. Second, in the event of an accident, they can accurately and timely make accurate judgments and take effective measures to prevent major losses. Third, the security incident can Quickly and accurately find relevant video and audio recordings and provide relevant departments with accurate and effective information.
The integrated video linkage system integrates independent systems such as video, audio, alarm, control, and video wall management on the basis of the original monitoring technology, making full use of the resources of the original independent system and improving the effectiveness of security protection.
Integrating the video surveillance system and the alarm intercom system undoubtedly enhances the elevator operation safety, but in the future, the elevator security system also needs to be able to transmit elevator operation data and be controlled remotely. With the increasingly higher requirements on the safety of elevator operation, elevator security systems incorporating video surveillance, alarm intercom, operation data transmission and remote control will meet more and more user requirements.
There are two factors that affect the safe operation of an elevator. First, the quality and reliability of the elevator system. Second, human factors cause personal safety in the elevator car.
For a long time, elevator intercom mainly adopts the bus-based intercom system, which is one of the mandatory requirements for the safe operation of elevators. However, with the popularization of video surveillance systems, newly installed elevators have begun to install video surveillance and improve the safety of elevator operations.
The installation of video surveillance in elevators is often faced with the problem of video interference because elevator motors are accompanied by strong electromagnetic radiation signals that can cause disturbances in video surveillance images. In order to solve the video interference problem, the factory will use a video anti-jamming device.
This article describes the elevator video alarm intercom linkage system, in the practical application of the new and old systems in engineering and users. It only needs to pass a single video cable to achieve video surveillance image transmission, alarm signal transmission, audio and video intercom signals, and video anti-jamming capability. This kind of stable and reliable non-bus transmission structure, reliable alarm mode, high-quality audio broadcast intercom way, automatic switching of video linkage function of alarm elevator image when alarming, greatly improving elevator safe operation, reducing cable material, shortening The construction hours reduce the system cost.
Elevator video alarm intercom linkage system elevator video alarm intercom linkage system has applied for the invention of the patented new technology, does not require the laying of cables, the use of elevator video surveillance cable not only transmit video surveillance signals can also transmit alarm signals, audio intercom, through The SCM control technology and the computer management software realize the video alarm intercom linkage control, which can realize the networking control of 128 elevators.
System Working Principle The core equipment of the video linkage control system is a single-channel audio and video control modulator (abbreviation: modulator), 8-channel audio and video linkage controller (abbreviation: controller), video linkage switcher (abbreviation switcher), management Computer composition. With the pickups, broadcast horns, and radio amplifiers, an elevator video alarm intercom linkage monitoring system can be formed.
Audio and video transmission. The use of cable TV audio and video signal transmission technology, the camera 0 ~ 6MHz video signal modulated to 49.75MHz above the high frequency band, the use of coaxial cable 0 ~ 1GHz bandwidth to transmit audio and video signals. This kind of transmission method is the same as the video anti-jamming device and the common cable, and the high-frequency signal sent by the modulator is demodulated by the controller's demodulation module.
Alarm signal transmission. Adopted the new technology that has applied for the invention patent, using the low frequency band of the coaxial cable, the alarm button in the elevator, directly using the universal normally open alarm mode, using the video cable to directly send the alarm signal to the terminal controller, and the controller Send alarm data to the management computer.
Broadcast signal transmission. Place a passive broadcast horn in the elevator and connect it to the modulator. The management computer issues instructions to the controller, and the broadcast signal is transmitted through the video cable to the elevator speaker.
System control. The system adopts RS232 and RS485 control mode to realize two-way data communication between the computer and the controller and the switcher. The functions of the system are realized by the microcontroller and the management computer in the controller. The system can connect up to 16 8-channel audio and video linkage controllers to realize video, alarm, audio intercom and control linkage of 128 monitoring points.
System implementation function 1 When the alarm button in the elevator is pressed, the video image of the alarm elevator and the sound in the elevator are automatically switched and displayed on the elevator monitor in the monitoring room. The controller has an alarm sound.
2 Switching the broadcast signal can achieve voice intercom with the elevator.
When 32 or more elevators are at the same time alarming, the computer can display 2 or more alarm prompts at the same time and automatically switch to the latest alarming elevator screen to realize intercom.
4 Monitor elevator and alarm intercom detection. The video image of each elevator can be switched and displayed through computer management software at ordinary times, and the monitoring image and intercom function can be detected through intercom feedback.
5 Three-way intercom or five-party intercom. The cable of the five-way intercom can be connected to the video cable. When a multi-party intercom needs maintenance and maintenance of the elevator, a simple intercom device or a small-size telephone exchange can be connected to realize multi-party intercom.
6 For high-grade elevators, the elevator's operating data needs to be transmitted to the monitoring room terminal equipment, and remote control of the elevator can be realized, so that the elevator operation is more reliable and the elevator fault can be solved more conveniently and quickly. Adding controllers in the elevator can transmit elevator controller operation data to terminal equipment and achieve remote control.
The main equipment in each elevator car is: audio and video control modulator (abbreviation: modulator), alarm button, pickup, broadcast horn, camera.
1 Install the audio pickup in the elevator car control board and connect the audio output to the modulator. The volume can be adjusted with the volume adjuster on the pickup. The pickup head can choose either built-in microphone or external microphone.
2 The elevator alarm button is connected to the alarm/broadcast control port on the modulator. The alarm signal is transmitted directly to the terminal equipment through the transmission cable.
3 The passive broadcast horn is connected to the alarm/broadcast control port on the modulator. After the alarm signal is received, the terminal device gives a broadcast signal to implement audio two-way intercom. If the broadcast horn breaks, it will automatically send an alarm signal.
4 The camera is connected to the video input port on the modulator.
5 The transmission cable connects to the RF output port on the modulator.
6 modulator power supply and camera, DC12V.
8-channel audio and video alarm linkage controller installed in terminal equipment (abbreviation: controller)
It can communicate with 8 elevator car in-cell modulators.
8-channel audio and video alarm linkage controller 18 elevator car video transmission cable is connected to the 8-channel video input port.
28 video outputs and 8 audio outputs are connected to the hard disk recorder.
More than 3 networked use, audio and video output connected to the audio and video control signal switch.
48 alarm test ports for testing alarm functions.
5 RS485 and RS232 communication ports, multiple stations use RS485 communication, and single station uses RS232 communication.
6 When used in a single station, COM connects to the audio output of the broadcast amplifier. Connected to audio and video control signal switcher when connected to the network.
Realization function: Receive 8 audio and video signals at ordinary times and output them to the hard disc recorder. When the alarm signal appears, the alarm indicator is on. The audio and video output is switched to the audio and video image of the alarm elevator. The broadcast audio signal is automatically connected to the elevator transmission cable and transmitted to the speaker connected to the control end of the front modulator. , alarm, intercom.
1 When multiple controllers are used in a network, it is necessary to switch out the audio and video images of the alarm elevator with the switch, and switch the broadcast signal and the telephone signal to each controller.
2 The audio and video output of each controller is connected to the switcher, and the audio and video output is connected to the TV wall monitor.
The 3JK1 port is connected to the audio output of the broadcast amplifier. JK2 port received the telephone signal for elevator maintenance. The COM port is connected to the COM port of each controller and outputs a switching signal to each controller.
4 through RS485 or RS232 and computer connection, there is a computer software control system.
Transmission distance audio and video control modulator can choose from CH1, CH2, CH3, CH4, CH5, and the output level is 115dB. The receiver's audio and video demodulation module has a receive sensitivity of 55dB. The difference between input and output levels is 60dB.
The national standard SYWV75 and SYV75 cable attenuation meters per 100 meters according to the above table, use CH5 channel modulator, using SYV75-5 cable transmission, loss of 8.1dB per 100 meters, theoretically can transmit 740 meters, taking into account the actual application of the loss 80% calculation, at least 590 meters can be transmitted. Select cable TV cable SYWV75-5, loss 4.6dB per 100 meters, theoretically can transmit 1300 meters, taking into account the actual application of the loss calculated by 80%, can transmit 1000 meters.
The computer management software elevator alarm intercom video linkage system can be used alone or in conjunction with the community perimeter alarm, burglar alarm, access control, and video wall management to form a comprehensive video linkage system.
The system can realize the video linkage of up to 128 monitoring points. Besides the elevator alarm intercom, it can also realize the video linkage of perimeter alarm, burglar alarm, and access control, and is managed with unified management software.
In the video alarm linkage control system, each elevator controller can control 8 elevators. The system can connect up to 16 controllers. When the person in the elevator presses the alarm button, the audio and video monitor will automatically switch to the image of the alarm elevator, hear the sound in the elevator, select “relay 1†to turn on the broadcast signal, and realize the intercom. The audio input of the radio amplifier is connected to the audio output port of the computer, and the microphone connected to the computer is used for dialogue.
In addition to implementing video alarm intercom in elevators, video peripheral alarm linkage and video access control linkage can also be implemented. The signal of JK1 is controlled by "relay 1", the signal of JK2 is controlled by "relay 2", and the signal of JK3 is controlled by "relay 3". JK1 ~ JK4 can receive 0 ~ 120V broadcast signal, telephone signal, RS485 signal, 0 ~ 12V power supply, to achieve different needs.
Integrated monitoring system management platform includes video alarm linkage control system and video wall control system. The integrated video linkage control system basically satisfies the main requirements of security protection. Each subsystem can be applied independently or integrated. It is compatible with existing alarm detectors, access control devices, hard disk video recorders and other equipment, enhances the effectiveness of security protection, reduces the cost of the system, and is suitable for the reconstruction of new and existing systems.
System Installation and Construction Applicable Conditions and Precautions The Video Linkage System is based on a video surveillance system using coaxial cable transmission and is suitable for retrofitting and new systems of old systems. According to the application of this system in the actual project, the following matters are noticed for the new system and the reformed system.
The newly-established system uses a SYWV75 CATV cable to create a new system transmission cable. Its other major feature is the use of F-joints for cable joints, eliminating the need for on-site welding and facilitating on-site construction.
Because the transmission characteristics of high-frequency signals and low-frequency signals are not the same, the construction specification is required to be handled, and the cable connectors must be handled well. There should not be too many connectors. If the cable connector is handled improperly during construction, excessive connectors are often the main cause of image quality problems.
The monitoring system of the existing old system renovation project has generally adopted the SYV75 video cable. When it is converted into a video linkage system, it does not need to re-lay cables. However, the original laid cable must be carefully tested to ensure the successful completion of the project transformation.
The problems that have arisen in undertaking the transformation of the Beijing Boya Xiyuan old system are mainly cable connectors. During the construction, it was found that there were too many non-standard cable connectors, and some of the connectors were immersed in the water. These problems caused the video image to be ineffective and had a greater impact on the RF signal.
Concluding remarks What are the real needs of security and the goals to be achieved? The first is “preventionâ€. Reliable and advanced security facilities can effectively prevent the occurrence of security accidents. Second, in the event of an accident, they can accurately and timely make accurate judgments and take effective measures to prevent major losses. Third, the security incident can Quickly and accurately find relevant video and audio recordings and provide relevant departments with accurate and effective information.
The integrated video linkage system integrates independent systems such as video, audio, alarm, control, and video wall management on the basis of the original monitoring technology, making full use of the resources of the original independent system and improving the effectiveness of security protection.
Integrating the video surveillance system and the alarm intercom system undoubtedly enhances the elevator operation safety, but in the future, the elevator security system also needs to be able to transmit elevator operation data and be controlled remotely. With the increasingly higher requirements on the safety of elevator operation, elevator security systems incorporating video surveillance, alarm intercom, operation data transmission and remote control will meet more and more user requirements.
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