Gas
Spring:
It consists of the following parts:
pressure cylinder, piston rod, piston, sealing guide sleeve, filler (inert gas
or oil and gas mixture), cylinder and cylinder control element the control
element (of a controllable Gas Spring) and joint. Principle is in the closed
pressure cylinder filled with inert gas or oil and gas mixture, the cavity is
higher than atmospheric pressure several times or dozens of times, the
cross-sectional area of the cross-sectional area of the piston rod is smaller
than the piston to produce pressure difference to achieve the movement of the
piston rod. Due to the different fundamental principle, the gas spring than
ordinary spring has the advantages of obvious: speed is relatively slow,
dynamic force changes little (within 1:1.2), easy to control.
The relative disadvantage is no small
volume spiral spring, high cost, relatively short life. Unlike the mechanical
spring, air spring has a nearly linear elastic curve. X between elastic
coefficient of the gas spring 1.2 and standard 1.4, other parameters according
to the requirements and conditions of flexible definition.
Category:
According to the characteristics and applications
of different gas spring, also known as the supporting rod, air support,
recliner, pressure rod, dampers etc. according to the structure and function of
the gas spring to classify gas spring free type gas spring, self-locking gas
spring, pull type gas springs, random stop gas spring, gas swivel chair spring
damper, pressure rod,Self Locking Gas Spring,Auto Gas Spring,Industrial Gas Spring, Groove Gas Spring,Stretching Gas Spring,Office Furniture Gas Spring, etc.. Several products in the automotive, aerospace,
medical equipment, furniture, machinery manufacturing and other fields have
been widely used.
Structure
and Function:
Gas spring is a kind of lifting spring can
be labor-saving, can be divided into self locking gas spring (such as the
bottom of the lifting seat backrest, boss chair, etc.) can not be self locking
gas spring (lifting support such as car trunk, closet doors), the structure of
the gas spring is mainly composed of a sleeve, a piston and a piston. Bar, with
a high pressure air or high pressure nitrogen in the sleeve, due to the
pressure difference between the ends of the piston area ranging, push the
piston and piston rod movement and support people or objects.
How
to Select the Right Gas Spring:
Quality evaluation of a gas spring quality
mainly from the following aspects: first is the seal, if good sealing will
appear in the process of using oil spills, leakage and other phenomena; second
is the precision, such as the need to 500N the gas spring force, some
manufacturers out of the error is not more than 2n, some manufacturers of the
products may and the actual needs of the 500N is quite far; again the use of
life, the life of its fully retractable count; the last is in the process of
the force value change, gas spring under ideal condition should force values
remain constant throughout the trip. But due to the factors of design and
manufacture, the gas during the spring force value inevitably changes. But the
magnitude of change is an important criterion to measure the quality of the gas
spring, the magnitude of change is small, the better the quality of the gas
spring, and vice versa Worse!
Gas Spring Gas Spring,Stretching Gas Spring,Office Furniture Gas Spring,Lockable Gas Spring VESTA Motoring Ltd , https://www.vesta-industry.com
Smart cities are full use of digitization and related computer technologies and methods to conduct comprehensive information processing and use of all aspects related to urban infrastructure and life development, and have a holistic approach to urban geography, resources, ecology, environment, population, and economy. The information system of digital network management, service, and decision functions for complex systems such as society. 
The purpose of a smart city is to create a safe, fast and harmonious city life. Its construction includes a wide range of concepts, such as the Internet, the Internet of Things, and cloud computing, which are broken down into specific content, including smart wireless, wireless cities, and safe cities. Among them, smart wireless and wireless cities involve wireless networks.
The development of global information and communication technologies (ICTs) is characterized by networking, broadband, and wireless. Traditional wired bandwidths are stretched and the public’s ever-increasing information needs cannot be met. Wireless networks have gradually become the mainstream of cities. With the rapid development of real cities, our cities are becoming more and more “intelligentâ€. Wireless networks can improve work efficiency, reduce costs, improve the quality of life, and improve the level of information. 
The concept of wireless city was originally proposed by Philadelphia, USA in 2004. It was originally based on the WiFi wireless local area access network based on the 802.11b standard, and it mainly achieved fixed wireless network access. Simply put, it is the use of WiFi and other technical standards to cover a city with a wireless high-speed broadband network, so that people's study, work and life get rid of the "cable" constraints, this is the "wireless city" concept of a good vision.
In 2008, taking advantage of the Beijing Olympic Games, Beijing vigorously built a wireless city. Beijing is known as “Wireless Beijing.†Immediately afterwards, the Shanghai World Expo and the Guangzhou Asian Games all vigorously launched the construction of wireless networks. 
The construction of wireless networks is inseparable from wireless devices. Wireless APs are commonly used devices built on large-scale wireless networks. Wireless APs are preferred for hospitals, schools, hotels, guesthouses, railway stations, and companies. Great effect. However, traditional wireless routers cannot meet the needs of a wide range of wireless coverage.
Wireless APs combine wireless AC controllers, switches, and routers to form an AP+AC model, occupying the wireless application market step by step with its irresponsible advantages. Feng Runda focuses on the field of wireless AP for ten years. It possesses the hardware and software products necessary for the construction of smart cities, including various types of wireless APs, wireless controllers, cloud AC, etc., to build the most perfect and most cost-effective WiFi network to help the construction of wireless cities. . 
In 2016, Fengrunda successively held 11 smart city solutions exchange conferences, of which “Wisdom Wireless†was an important part of the conference. In order to promote the development and construction of “smart wirelessâ€, a wireless AP coverage solution has been specifically introduced. This is a set of wireless WiFi coverage solutions that are the most advanced, best performing, most convenient, and intelligent on the market.
Wireless AP is a powerful tool for the construction of smart cities. Both are inextricably linked. If there is no wireless AP, the smart city construction effect will be greatly reduced. 
Wireless AP boosts the rapid development of wireless smart cities
With the development of safe cities and smart cities, it can be seen in many articles that wireless APs help the development of smart cities. How does wireless AP help the development of smart cities? What is the relationship between them?