Elevators are a major category, and elevators are one of them. According to the transmission mode, it can be divided into wire rope type, gear rack type, and hydraulic type; According to the intended use, it can be divided into engineering construction use and ordinary civilian use. An elevator is a type of lifting equipment consisting of a walking mechanism, hydraulic mechanism, electric control mechanism, and support mechanism.
An elevator is a vertical lift powered by an electric motor, equipped with a box shaped car, used for carrying people or goods in multi story buildings. More and more production enterprises need to transport heavier goods to 2-3 story workshops in the actual production process. Due to the weight of the goods, the transportation height is only 2-3 stories. If they choose to install a freight elevator, in addition to the high cost of the elevator itself, it also greatly increases the construction cost of the elevator shaft and machine room. Therefore, the vast majority of production enterprises choose to install an elevator instead of a freight elevator, because the elevator has the function of vertical lifting, and its price is much lower than the elevator price. Moreover, the elevator does not have strict requirements for the shaft (the shaft of the elevator needs to be stressed), and even does not need a shaft, which further saves construction costs.
However, some local technical supervision departments do not agree with the installation of elevators in shafts solely for cargo transportation, let alone for carrying people. The reason for disagreement is that the elevators installed in the shaft belong to earth elevators. According to the definition of elevators in the "Regulations on Safety Supervision of Special Equipment" issued by the state in 2003, "Regulations" define elevators as follows: "An elevator refers to a mechanical and electrical equipment driven by power, which uses a box running along a rigid track or steps running along a fixed line to lift or parallel transport people and goods
The author believes that in some places, the elevator in the shaft is regarded as a dirt elevator, and the reasons are not sufficient, or it is dogmatic to implement the regulations. Elevators indeed have the functions and some similar features of elevators, which is why they are widely used in production enterprises and reflect their economic value. However, there is still a fundamental difference between elevators and lifts, and the term 'power driven' in the column refers to the essential difference between elevators and lifts. Elevators are powered by a traction machine and pulled vertically along a rigid track by a steel wire rope to complete the lifting action. However, the steel wire rope theoretically has a risk of breakage and must have corresponding safety protection facilities, such as safety clamps and speed limiters. Elevators are powered by hydraulic pressure and lifted vertically along rigid tracks by hydraulic cylinders to complete the lifting action.
To sum up, elevators have certain common characteristics and essential differences in power drive. The difference between them is that elevators rely on steel wire ropes to perform top-down traction, while elevators rely on oil cylinders to perform bottom-up lifting. Different power sources produce different execution methods. It is obvious that there are two unsafe factors in steel wire rope traction, namely rope breakage, squatting at the bottom, and control failure causing top impact. Corresponding safety devices must be installed to ensure its safety, and it is mandatory by the state. And the elevator is also safe because it relies on oil cylinders to lift from bottom to top, without any squatting or toppling factors. Furthermore, according to national regulations, elevators are classified as lifting machinery equipment. They can be used for carrying people outdoors for high-altitude operations, and installed in shafts with rigid tracks only for carrying goods, isn't it safer?
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