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With industrial television monitoring systems, ground monitoring personnel can directly monitor the downhole and downhole conditions, not only can intuitively monitor and record the safety production conditions at the underground work sites, but also can detect hidden safety hazards in time and prevent problems before they occur. Provide relevant first-hand image data for post-mortem analysis of accidents. Therefore, the industrial television monitoring system is an important part of the modern mine safety production monitoring system.
Industrial television monitoring system composition method The current industrial television monitoring system can transmit image data on a computer network (local area network or wide area network), and is basically not limited by distance. The signal is not susceptible to interference, and can greatly improve the image quality and stability; Second, Digital storage becomes possible. The compressed video data can be stored on hard disks and disk arrays for future inquiry and retrieval.
2.1 Basic structure of industrial television monitoring system 2.1.1 System composition:
Front end camera section Line transmission section System control section display (record)
Network Transmission Section 2.1.2 System Functions:
The front-end camera section is installed on the site and includes cameras, lenses, protective covers, brackets, and electric pan/tilt heads. Its role is to capture the scene and protect the camera equipment.
The role of the transmission part of the line is to transmit the video signal sent by the on-site camera to the control center, which generally includes cables, modulation and demodulation equipment (such as optical transceiver).
The control part is responsible for the control of all devices and the processing of image signals (such as controlling the keyboard).
The display and recording part is to transfer the video signal from the scene to the monitoring equipment and record it with a hard disk recorder. The main equipment it contains is a monitor and a hard disk recorder.
The network transmission part uploads the video signal collected by the video recorder to the network, and provides the client to view the monitoring image and video at any time.
Industrial TV Surveillance System Equipment 3.1. Front-End Camera Section The front-end camera section includes a camera, lens, protective cover, bracket, and electric pan/tilt head.
The camera of the camera is a front-end device that acquires the image of the surveillance site. It uses the area-array CCD image sensor as a core component, plus a synchronization signal generation circuit, a video signal processing circuit, and a power supply. The camera has black and white and color, because the black and white camera has the advantages of high resolution, low illumination, especially it can be imaged in the infrared light, so in the industrial television monitoring system, black and white CCD camera is mainly used in wells and other poor lighting Place.
At present, our mine mainly uses the following two cameras:
Wotek Black and White Camera WAT-902H3
Brand/Model: Wotek WATEC/WAT-902H3 Type: Black and White Camera Pixels: 440,000 (dpi)
Minimum illumination: 0.0005 (Lux)lux Size: 1/3 (inch) Image Sensor: 1/3 CCD
Power Supply Voltage: DC12 (V) Style: Black and White Camera Horizontal Definition: 570 (TVL)
Features:
Starlight ultra low illumination black and white camera 570 line high resolution DC / VIDEO dual-drive industrial design is good at dark environment monitoring is a coal mine product lens automatic aperture manual focus lens automatic aperture fixed focus lens in the structure has been a big change, it Equivalent to adding a micro motor driven by a gear mesh to the aperture adjustment ring of the manual aperture fixed lens, and lead a 3-core or 4-core wire from its driving circuit to the auto iris lens so that the micro motor in the lens corresponds Do forward or reverse rotation to automatically adjust the aperture size. Automatic aperture lenses are further divided into two types including amplifiers (video-driven) and without amplifiers (DC-driven).
Protective cover The protective cover is used to protect the camera from dust, rain, high and low temperatures. Shields generally fall into two categories. One type is an indoor protective cover. The protective cover has a simple structure and is inexpensive. Its main function is to prevent the camera from falling dust and has a certain degree of security protection, such as anti-theft, anti-damage and so on. The outdoor protective cover is generally an all-weather protective cover, that is, regardless of wind, rain, snow, high temperature, low temperature and other adverse conditions, can make the camera installed in the protective cover to work properly. Therefore, this protective cover has the functions of cooling, warming, preventing rain, and preventing snow. In the same way, the camera can still take images normally in rainy and snowy weather.
Puan aluminum alloy explosion-proof protective cover Puan explosion-proof dome protective cover (passport with temperature-controlled heater, cooling fan)
Flameproof Camera Bracket for Cape Mine The Puan Camera Bracket is used to support indoor and outdoor fixed-point cameras. It can only be used to manually adjust the shield's fixed position in a small range, and it cannot be moved after adjustment.
Line Transmission Section 3.2 Cables Video Cables Video cables use coaxial cables of 75Ω. The commonly used cable types are SYV-75-3 and SYV-75-5. Their non-relay transmission distance for video signals is generally 300~500m.
The communication cable communication cable refers to the 2-core cable that is connected between the system main unit and the decoder. The common 2-core jacket cable is used. Generally speaking, the shielded layer has better anti-interference performance than the two-wire cable. It is more suitable for long-distance transmission under strong interference environment. Optional communication lines such as RVVP-2/0.15 or RVVP-2/0.3.
The power line is regarded as the power line in the monitoring system is generally arranged separately. In the monitoring room, a high-power DC power supply is used to supply power to the entire system, and a master switch is placed in the monitoring room to directly control the entire monitoring system.
Fiber optic cable and coaxial cable are similar except that there is no mesh shielding layer. The center is a light-transmitting glass core. In a multimode optical fiber, the diameter of the core is 15 μm to 50 μm, roughly equivalent to the thickness of human hair. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass envelope having a lower refractive index than the core so that the optical fiber is held within the core. On the outside is a thin plastic jacket that protects the envelope. Optical fibers are usually bundled and protected by a shell. The core is usually a double-concentric cylinder made of quartz glass with a small cross-sectional area. It is brittle and easy to break, and therefore requires a protective layer. Its structure is shown in Figure 1.
Figure 1 shows the fiber plane structure of the industrial TV system uses a single-mode outdoor fiber optic cable, single-mode fiber core diameter is small, at a given operating wavelength can only be transmitted in a single mode, transmission frequency bandwidth, transmission capacity.
The main advantages of optical fiber communication systems are:
(1) Transmission frequency bandwidth, large communication capacity.
(2) Low line loss and long transmission distance.
(3) Strong anti-interference ability and wide application range.
(4) Fine diameter and light weight.
(5) Strong chemical resistance.
(6) Optical fiber manufacturing resources are abundant.
Fiber optic cable connecting device ST-ST Optical Flange Optical Patch Cable Fiber Optic Terminal Box Optical Cable Continuation Box (horizontal)
Video Control System 3.3 System Control The control part of the system is the "heart" and "brain" of the entire system and is the command center for implementing the functions of the entire system. The control part mainly consists of the equipment room cabinets. The main functions of the equipment cabinet are: distribution of video signals, switching of image signals, recording of image signals, control of the camera and its auxiliary components (such as a lens, a pan-tilt, a protective cover, etc.) (remote control), and the like. In each of the above sections, the two most important factors affecting the image quality are allocation and switching of image signals. After the image signal has been transmitted, it is assigned to the video switching section and sent to the monitor. Another important aspect of the general console is the ability to remotely control cameras, lenses, pan/tilts, and guards to perform a complete, detailed monitoring or tracking of monitored sites. The hard disk video recorder installed on the main console can record the image of the monitored site at any time for future reference or as an important basis.
The control keyboard The control keyboard is an indispensable device in the integrated monitoring system. The full control of the matrix in the camera, the pan tilt, and the equipment cabinet must be achieved by controlling the operation of the keyboard.
Generally, there are many numeric keys and function keys on the control keyboard. Among them, the numeric keys used to select the camera and monitor function keys are used to perform various control operations on the selected front-end device. The liquid crystal display on the control keypad is used to display the status of the control commands or the various monitoring points in the system.
Video recorder control provides a 485 control port on the digital video recorder. The digital video recorder supports a variety of current popular control protocols. It can be set according to the system design and decoder protocol. It is connected to the decoder through a twisted pair cable and can be directly connected to the front end. Cameras, PTZ, etc. are controlled.
Matrix and control keyboard:
Matrix Controller Control Keyboard 3.4 Display (Record)
The display portion of the video wall and the display portion of the display typically consist of several or more monitors (or ordinary televisions with video input). Its function is to display the transmitted images one by one. In a television monitoring system, especially in a television monitoring system composed of a plurality of cameras, generally not one monitor corresponds to one camera for display, but several camera's image signals are alternately displayed with one monitor. . Place the monitor in a location suitable for the distance, angle, and height viewed by the operator. It is generally at the rear of the general console that a dedicated monitoring shelf is set up and the monitor is placed on the shelf.
The selection of the monitoring monitor monitor monitor of the dispatching system shall meet the requirements of the system's total functions and general technical specifications, and in particular shall meet the requirements for long-term continuous work. Since monitors or televisions have already formed products, everyone is familiar with them and will not elaborate on them here.
The video distributor video distributor can evenly distribute one video signal into multiple video signals to provide multiple video or subsequent video equipments such as video recorders to be used simultaneously. Each video signal output by the distributor is still guaranteed to have the same format as the input signal, ie, 6 MHz video bandwidth, 1V (peak-to-peak) voltage, and 75 output impedance, where the signal voltage is 0.7V and the sync head voltage is 0.3V. It cannot be assigned in a simple parallel manner because simple parallel connection will change the characteristic impedance at the node, but the signal will still attenuate 6dB.
Record part of the network digital hard disk recorder features features using the latest USB2.0 interface to further stabilize the USB mouse function, quickly achieve USB backup, USB upgrades and other operations using high-performance DSP to achieve standard H.264 compression algorithm, the image is more refined, stream Smaller, smoother network transmission Using standard network protocols and standard compression algorithms, easy interoperability on various platforms SATA hard disk interface, support for SATA recording backup using dual stream technology, more suitable for narrowband transmission, video support real-time D1 /HD1/CIF/QCIF Optimized Combination Remote Maintenance: Parameters can be set by application software or browser.
Online upgrade: It is possible to upgrade its control software while the network hard disk recorder is working through the network.
Chassis standard: 19-inch standard chassis, easy installation, can be on the rack.
Control Panel: Supports the local monitoring panel key operation, full menu operation, and easy to use.
Keyboard Support: Supports RS-485 interface keyboard.
Preview function: support video local real-time preview and network real-time monitoring. Supports partial image occlusion.
Playback function: Supports playback of recorded streams locally on the monitor and playback of recorded streams on the management host over the network.
PTZ control: The pan/tilt and lens can be controlled via the local control panel or the network using the RS-485 interface.
Multi-polarity rights: Network DVRs provide administrators and operators with two levels of authority.
Troubleshooting and Monitoring of Industrial TV Surveillance System Troubleshooting of Industrial TV Troubleshooting Symptoms Failure Judgment Troubleshooting and Handling Precautions Remarks No image display No image display is available in the video recorder and TV wall of the equipment room. Check the power supply in the equipment room. Check if the video distributor and matrix work properly. The normal power supply is restored, and the video distributor and the matrix work normally to pay attention to the power supply. The image is displayed as a blue screen.
There is no image displayed on the video wall of the VCR. Check if the front camera power supply is normal and the camera is working properly. Restore power supply and make the camera work normally. Check the video cable connector for looseness, dropout, open circuit, short circuit, redo connector troubleshooting. The camera is powered by a decoder. Check the decoder if the power supply is abnormal. The image is displayed as a blue screen.
Computer room recorders have normal image display on each channel, and no image is displayed on a TV wall image. Check if the TV power is normal. Restore normal power supply. Whether the various settings of the TV are correct and the function settings are adjusted correctly. Pay attention to the function setting instructions of the TV manual. The image is displayed as a blue screen.
The video wall is normal and there is no image on the video recorder. Check if the line connector between video distributor and video distributor and recorder is loose or falling off. Remake the connector. Note that the connection of the BNC head is reliable. The image is displayed as a blue screen.
There is a signal but no image is displayed. The image is black or extremely dark. Check that the cover glass is dirty. Clean the shroud glass. Whether the video line has poor contact. Reconnect the video cable to eliminate bad contacts. Poor contact You can easily touch the connectors by hand. The image is displayed with a disturbing line. The image shows snow, flashing video lines have poor contact, or the line is damaged and attenuated. Find the point of failure and recreate the line connector to eliminate the fault.
A certain road image has wood grain interference. The video line shield does not have good electromagnetic interference, increases the line shielding, and increases the shielded grounding of the video line. If the grid power supply is not clean, adding a clean power supply or an online UPS can solve the problem. Be careful not to generate ground potential difference with other grounding electrodes.
There is a rolling AC power frequency interference that causes the device to generate electromagnetic interference and enters the system via the line, finding the device to electromagnetically shield it. If shielding does not work, it is best to replace the equipment.
Can't control completely Check whether the keyboard power and control circuit connections are correct. Provide the correct power supply for the keyboard and properly connect the keyboard control circuit. Note that the keyboard uses a DC 12V power supply.
Check if the decoder power supply is normal. Provides 24 AC power for the decoder.
Check whether the decoder can communicate with the keyboard, whether the communication light is flashing, and whether the relay has a sucking sound. Check the wiring connection to troubleshoot the connection. If it is determined that the line can not communicate after it is normal, the chip is faulty and the chip is replaced. Pay close attention to the inspection.
Some functions cannot control communication. There may be a delay. Please wait a moment.
Check if the connection between decoder and control section is normal. Troubleshoot the connection.
If the above conditions are all eliminated, then the controlled device is faulty. Please consult the manufacturer for details.
Introduction to Industrial TV Surveillance System In recent years, more and more coal companies have begun to use industrial television monitoring systems to monitor, understand and manage the important production processes and potential safety hazards on the underground and on the ground. The industrial television monitoring system can transmit the collected images to the mine leaders and relevant departments at any time via the Internet, so that relevant leaders can keep abreast of the working conditions of the underground equipment and all important production processes.