In modern high-rise buildings, elevators are the most important means for people to travel. Anyone can use elevators to shuttle through the floors. But in reality, some floors in the building do not want anyone to enter through the elevator; or, sometimes users need to use the elevator at certain times, but the elevator has been shut down because of security management needs. These situations bring many inconveniences to security management and users.
Production equipment refers to the means of labor or utensils that are manipulated by production workers in the production process and are necessary to directly change the attributes, properties, forms of raw materials or enhance the appearance value. Such as blast furnace, machine tool, reactor, printing and dyeing machine, etc. The quality of production equipment and its technological advanced degree directly affect the quality, accuracy, output and production efficiency of products. As a fixed asset, the value consumption of production equipment in the production process is gradually transferred to its products.
Bridge engineering refers to the working process of bridge survey, design, construction, maintenance and verification, as well as the scientific and engineering technology to study this process. It is a branch of civil engineering. The development of bridge engineering mainly depends on the need of transportation.