Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas.
The body of sectional door is forming by 40 mm sandwich panels. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3).
Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses.
Doors is working sliding by be the most appropriate the gap between the top level of the gate with a ceiling height within the side rasils. The door can be mounted in different ways according to the gap distance (standard, low, highlift and vertical track systems).
Industrial sectional doors can easily be opened automaticly by 230-380 V-AC/50 Hz electric motor or manualy thanks to torsion spring system that balances the weight of the door.The galvanized springs are made to be durable of 25.000 door cycles.Motor with emergency chain All the drive systems have a mechanical back-up system fitted to the reduction gearbox of the electric motor, so that the sectional door can be opened if the power fails. The reduction gearbox can then be powered using the chain.
Industrial Sectional Door,Industrial Overhead Sectional Door,Industrial Warehouse Sectional Door,Industrial Garage Interior Sectional Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.highspeedshutterdoor.com
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New underground emergency communication equipment
"The new underground emergency communications equipment" is a major achievement Shenyang Fire Research Institute of Ministry of Public Security of the Ministry of Public Security to assume complete technical research projects, "the underground construction emergency communications technology research and equipment development" made the project acceptance by experts in August 2017.
The result is a technical equipment for solving live video transmission in underground multi-layer complex building environment, which is mainly composed of four parts: single soldier acquisition and transmission terminal, multi-carrier fusion relay, MESH relay and command display terminal, and adopts multi-carrier and Self-organizing network convergence communication technology enhances the vertical networking capability and horizontal coverage of wireless signals in underground complex building environments. The visual link monitoring technology is used to solve the problem of optimizing the location of the deployment site of the networking equipment, and the underground building is realized. The video transmission in the environment of fire fighting and rescue is reliable, and has the characteristics of good protection performance, high communication stability, and practical use and operation. It can provide effective technical means for the firefighting forces to carry out underground communication.
The multi-carrier communication frequency band of the result is 520MHz, the self-organizing network communication frequency band adopts 580MHz, the radio frequency output power is 1W, the transmission delay is less than 100Ms, and the standard definition and high-definition data interface are provided. The results have been measured in complex scenes such as large underground parking lots, commercial plazas and tunnels, and the application effect is good.
Emergency communication equipment physical map
System composition topology