I. Overview
The goal of building
In order to effectively maintain the campus security precautions and ensure the smooth progress of school teaching and scientific research, this solution builds a unified platform for campus security monitoring and security precautions according to the school's needs, to achieve dual networking at the school and county levels, unified management of monitoring data, and scientific analysis To achieve real-time monitoring without dead ends, parental supervision, and one-key alarm; provide strong security for the personal and property safety of teachers and students in and out of schools, prevent campus injuries and various behaviors, and focus on improving social harmony and stability. The campus is built into a sunny and safe place. The specific construction goals are as follows:
1) Build a convergent platform of video, voice, intercom, broadcasting, and help-alarm integration, integrated publicity, prevention and control system, breaking the previous drawbacks of multi-system parallelism, large management burden, high use and maintenance costs, and realizing hidden danger supervision Mechanism, effectively solve the supervision problems of hidden safety hazards on campus.
2) Combining the daily work of the hidden safety inspection and governance of the school with Internet technology to achieve synchronization of the network system platform and routine work, that is, data synchronization and progress synchronization.
3) Smart safety campus with school safety risk management platform + video + voice + intercom + broadcast + one-key alarm.
2. Scheme design
The fusion system supports a multi-level architecture, center + sub-control center + front-end, where the sub-control center can be multi-level expanded according to administrative divisions, such as city + district + county, district + county + school.
Detailed application design
The smart campus integration solution focuses on the two major functional systems of teaching and educational affairs, and is decomposed as follows:
1. Campus Security and Help
1) One-click help:
One-key alarm (SOS) equipment (alarm box or alarm column) is deployed in key campus areas such as stadiums and intersections, and two buttons can simultaneously link the security room, management center and 110 center. With visual function, it can record the alarm audio and video, and can link the status of the electronic map. It can broadcast and shout through the full-function alarm equipment; give help to the helper, warn and deter the perpetrator; give time to the helper to help .
2) Safety of teaching building:
Students can use the intercom terminal to press the corresponding button when an emergency occurs or need assistance, and can immediately talk to the sub-control center or broadcast main control room; the sub-control center or broadcast main control room can also monitor the classroom through the terminal To understand the situation of the students and make broadcast shouts when necessary to quickly stop the fighting.
3) Safety management of dormitory building:
When an emergency occurs, students can conceal anonymous alarms with one click, and the security department and the management center can give time to respond, start the visual broadcast intercom terminal in time, and conduct two-way communication
4) Cafeteria safety:
Through the video intercom terminal and linked surveillance cameras, you can check the student status in the sub-control center or broadcast main control room, and you can also use it in an emergency;
5) Security at school entrance:
Install visual intercom alarm terminals in the school gates, entrances and other areas to provide students with use. When students need help or find fights, fights or other dangerous police situations, they can use the visual intercom alarm terminal device to send a key to the school to monitor The central platform host can realize two-way visual intercom with the monitoring center, and those that need to be reported and processed can be reported gradually.
2. Leadership tour, auxiliary teaching management
Leaders or managers can arbitrarily call the video intercom terminal of the classroom in the office or management center through the management host to conduct random inspections and inspections on the overall teaching situation of the school. Not only can you see the teaching situation on the spot, but you can also hear the real story Content; the entire sampling and inspection process is comprehensive and true, does not interfere with teaching, and is carried out at any time. The leader masters the hand information (the comprehensive information of teachers, students, and interaction is comprehensively mastered through a system), and can more propose improvement plans, optimize teaching methods, and adjust Educational Resources.
3. Campus radio
It can independently realize the visual intercom and broadcast of a classroom or partition (including personalized music ringing, classroom exercises, eye exercises, flag-raising songs, radio program playback, etc.), and realize unattended automatic reminder services.
At the same time, the system provides emergency broadcast and information release functions. Integrated fire broadcast function: it can receive short circuit and 12V-24V alarm signals of the fire center, and realize the alarm function for each district or all areas;
4. Listening and multimedia teaching
The school can input through the server sound card, and the externally controlled audio sources such as CD, tuner, deck, etc. can be programmed to achieve single-channel manual or automatic playback output; meet the listening test and multimedia teaching requirements.
5. Streamline video conferencing
When multiple departments of the school need to discuss matters together, they cannot gather everyone to the meeting. At this time, a temporary meeting can be quickly organized through the management host, and the participants need to be managed by the nearest (available in the office, principal's office, police office) The host joins the video conference, which is convenient, flexible, and quick to discuss.
6. Offline ringing
The system can download the normally running timing program to the audio decoder of each partition. When the system server or network is abnormal, the terminal can normally run the timing program.
7. Security inspection
In the sub-control center (police room), you can also patrol the scene through the visual intercom terminals in various areas, and you can quickly deal with it when you see a dangerous event.
8. Dormitory management
Loud alarm:
1) Through the video intercom terminal, check whether the students rest on time within the punctual time, and shout to the students staying outside
2) The terminal can also be connected with an external audio cable to the integrated power amplifier to drive the broadcasting of the corridor of the entire dormitory building;
3) The noise level can be monitored and managed. When the sound of the dormitory area exceeds the normal range, the management center can warn and deal with it.
3. Technical characteristics
1. Scalability, compatibility and integration capabilities
1) Support standard protocols such as onvif protocol, SIP protocol, GB28181 protocol, provide standard interfaces to facilitate data sharing between platform subsystems
2) It can be connected to VOIP system independently (support mainstream IP-PBX), and can realize audio and video call with IP video. Access control system, video monitoring system, alarm system, etc. can be integrated in the project;
3) Break through the shortcomings of the separation and closure of traditional broadcast and intercom systems, and realize cross-system linkage, including video and broadcast linkage, remote control access control, remote control light switch, etc.
2. Information source collection capability and linkage capability
Information collection, including voice information, video information, alarm information, intercom information; the system intelligently analyzes the collected information, according to preset thresholds, it can link emergency broadcasts, notify security forces, start alarm prompts, link audio, video, Acousto-optic switch; enable managers to fully understand the situation, respond to disposal forces in a timely manner, and call for help from helpers.
3. High voice sampling rate
Voice: support PCM, AAC, G711 audio encoding formats; voice files support MP3, WAV and other file formats; support 8K-48K sampling rate, 32K-768K code rate file playback makes the broadcast sound quality clearer; all terminal devices use hardware echo Elimination of audio processing technology can well cancel echo and suppress noise. The breakthrough in voice, the support system is applied to full dual video voice calls, multi-party video conference; the system has encrypted the voice encoding.
4. Support starlight level function and HD video resolution
Video: The video supports H.264, H.265 encoding formats, supports CIF, D1, 720P, 1080P multiple resolutions; supports star-level night vision and wide dynamic, strong light suppression, weak light compensation, at night and backlighting It can also clearly identify other people's faces under the circumstances; supports real-time screen time and title overlay settings, and can superimpose information such as video resolution, code rate, time, and title content on the screen.
5. Multi-alarm source collection and linkage capability
Alarm: receive terminal alarm, support motion detection alarm, IO trigger alarm, and support intelligent analysis threshold alarm (such as noise threshold), starlight camera night recognition monitoring alarm; with alarm display, recording, recording and other functions; can set alarm Send to 110 command center; the system is all based on network operation.
6. Full two-way video intercom
Video intercom: The system provides one-key function; after the call is connected, the full two-way video call is realized in a hands-free manner, and the function of echo cancellation is provided. Specific practical functions
1) Interrupt function: other users can interject low-level users in the call
2) Multi-party conference mode: support multi-party video conference, between application host and host
3) Hosting mode: When the staff of the regional host leaves or disconnects from the network, the system will automatically host its management to other hosts for management, effectively preventing host abnormalities and unattended alarms.
4) Call transfer function: can be set to busy transfer, disconnected transfer, non-responsive transfer, transfer by time period, etc.
5) Status monitoring: the real-time status and working status of the terminal can be visually displayed on the screen of the intercom management host, which is convenient for debugging, inspection and maintenance; each button can add the description of the location of the network point, which is convenient for management and operation.
7. Multiple broadcast applications
Network broadcast: Support three broadcast transmission protocols of UDP, TCP and multicast, and can set different broadcast transmission methods for different scenarios. Strengthen security education and publicize security prevention knowledge through broadcasting, warn the predicted unsafe factors, play a preventive role, effectively reduce the probability of danger; support multiple broadcast applications, including
1) Broadcasting in the whole area: it can broadcast audio files, shouting and external audio sources in the whole jurisdiction.
2) Partition broadcasting: it can broadcast audio files and shouts in the partition
3) Scheduled broadcast: set the broadcast time according to the system, and it will automatically play when the time comes
4) Firefighting broadcast: When a firefighting alarm occurs, a specially recorded firefighting audio file is played, and the broadcast is automatically cut to a large volume.
8. Cross-system integration and system integration capabilities
Convergence capability: cross-system integration with video surveillance system, access control system, Xueliang engineering platform, safe city platform, smart community platform, and smart city platform.
System integration: integrate alarm, broadcast, intercom and video systems to realize voice linkage video, video linkage sound, alarm linkage video, alarm control sound and light switch, and video linkage broadcast function.
9. Storage function
1) Local storage and network storage mode: support local storage and network storage of the terminal, and local and network storage strategies (storage mode, storage time, storage conditions, etc.) can be configured in the system platform according to actual needs. All terminals support local storage of audio and video files SD card and network center storage, and support the NVR storage function of mainstream manufacturers. The intercom terminal can directly store audio and video data in NVRs of mainstream manufacturers such as Haikang, Dahua, Keda, and Yushi.
2) Storage strategy: can achieve full-time or regular storage
3) Storage practical detail design: audio and video storage at the same time; support alarm picture capture function, can capture and store 1-60 seconds of screen pictures in the alarm period. The system stores the recordings and videos of all terminals in the management server, and combines the audio and video of the intercom terminal with the audio files of the intercom in the management center into one MP4 file for storage. The user can use the calling workstation or PC client to retrieve at any time.
10. Management ability
The system adopts "multi-level sub-control management, unified command" management mode, which is convenient for multi-level units to perform their duties. The system has a terminal-sub-control center-command center three-level management mode. Among them, the command center sets up a first-level server, and each branch control center sets up a second-level server. Both the first-level server and the second-level server have the function of managing the intercom terminal under their jurisdiction, ensuring that any single point of failure will not affect the operation of the entire system, including failures. Intercom terminal managed by the server. All device terminal cloud platform registration is convenient and fast.
11. Ease of use
One end controls the whole world, users can control all front ends of the system on one client, practical value and user experience are greatly improved; the command center and sub-control center can make point-to-point, partition or all calls and broadcasts to each device; APP users only need to log The platform can be used for remote video intercom, remote broadcast, remote music playback and other controls.
A Gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression.
Gaskets allow for "less-than-perfect" mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced by cutting from sheet materials.
Gaskets for specific applications, such as high pressure steam systems, may contain asbestos. However, due to health hazards associated with asbestos exposure, non-asbestos gasket materials are used when practical.
It is usually desirable that the gasket be made from a material that is to some degree yielding such that it is able to deform and tightly fill the space it is designed for, including any slight irregularities. A few gaskets require an application of sealant directly to the gasket surface to function properly.
Some (piping) gaskets are made entirely of metal and rely on a seating surface to accomplish the seal; the metal's own spring characteristics are utilized (up to but not passing σy, the material's yield strength). This is typical of some "ring joints" (RTJ) or some other metal gasket systems. These joints are known as R-con and E-con compressive type joint.
Gasket
PTFE Gasket, Spiral Wound Gasket, Ring Joint Type Gaskets
Shijiazhuang Bang dong Pipeline Technology Co,Ltd. , https://www.bd-pipefitting.com