First, the functional description:
With the increasing complexity of road conditions and the timely delivery, sharing, and exchange of information, a powerful highway broadcast intercom management system is naturally required. Use the existing network of toll stations to formulate an efficient, reliable, and stable "network highway broadcast intercom system."
In the monitoring rooms of each toll station, there are intercom hosts, each lane toll booths set intercom extensions, tunnel set-up help intercom extensions, service areas and other common areas to set horns and columns, which can achieve the following functions:
, help for the police: each toll booth in case of emergency can be connected to the extension or extension of the hidden button to the station monitoring room host emergency alarm; each tunnel and other help points, in case of emergency alarm to the monitoring center.
Two-way intercom: Each toll booth extension can communicate with the host of the station monitoring room; two public address points can communicate with the monitoring center. Intercom can be linked with video surveillance.
Broadcasting in the region: The monitoring center can broadcast MP3 files, external audio broadcasts, and Internet radio broadcasts to public areas such as toll booths, service areas, and tunnels.
, Partition broadcasting: The monitoring center can perform zone broadcasting on the designated area as required, and the volume of each zone can be individually adjusted.
Broadcasting propaganda: The monitoring center may issue emergency broadcast propaganda and notifications for the entire region, multiple districts, and single districts; the leadership office may call the propaganda to the designated area to facilitate the issuance of emergency broadcast announcements or speeches.
Second, system equipment and instructions
, YAH server: YAH server is the most important part of the system, responsible for the audio and signaling processing of all devices.
, Network Paging Microphone: The NM 803 Internet Paging Microphone can be used as a center of broadcast to shout to the scene. Use a dedicated network microphone for faster operation and clearer calls.
, Network broadcast horn: NA 744-30W network broadcast horn is a highway dedicated broadcast terminal, with penetrating power and other characteristics. The terminal is waterproof, easy to install and suitable for outdoor use.
, wall-mounted network intercom terminal (tunnel): waterproof design YAH605 is a high-speed km private network intercom terminal, using 10W waterproof speakers, intercom sound. YAH605 is equipped with two buttons to call two different hosts.
, Desktop network intercom terminal (toll booth): desktop NM804 is a dedicated intercom terminal, desktop design, using gooseneck microphone. The NM804 is equipped with two buttons to call two different sip hosts.
Third, the configuration list
Fourth, the system structure diagram:
Finned Tube
The finned tube is to improve the heat exchange efficiency. By adding fins on the surface of the heat exchange tube, the outer surface area (or inner surface area) of the heat exchange tube is increased, so as to achieve the purpose of improving the heat exchange efficiency. Such a heat exchange tube . Usually used for heat exchange between liquid and gas.
Finned tube is a heat exchange element. As a heat exchange element, finned tubes usually work under high-temperature flue gas conditions for a long time. For example, the finned tubes usually used in boiler or harsh environments, high temperature and high pressure, and in a corrosive atmosphere. This requires that the finned tubes should have high anti-corrosion properties, Anti-wear properties, lower contact resistance, higher Stability and anti-dusting ability.
There are many types of finned tubes, and new varieties are constantly emerging. According to the classification of processing technology, there are extruded fin tube; high frequency welded finned tubes; rolled formed finned tubes; suit formed finned tubes ; cast finned tubes; tension wound finned tubes; Inserted tubes.
According to the shape of the fins, there are square finned tubes; circular finned tubes; spiral finned tubes; longitudinal finned tubes; corrugated finned tubes; spiral serrated fins Helical Serrated Finned Tubes; pin-shaped finned tubes; integral plate-shaped finned tubes; inner finned tubes.
According to whether the fin material of the finned tube is the same as that of the base tube, it can be divided into: single metal finned tube, bimetallic composite finned tube.
Single metal finned tubes are classified by material into copper finned tubes; aluminum finned tubes; carbon steel finned tubes; stainless steel finned tubes; cast steel finned tubes.
