besides considering safety, the angle setting should also consider the principle of man-machine structure. Figure 2 shows the requirements for ladder setting. It can be seen that the ratio of the optimal step height to the step distance is 17/29, which translates into an angle of 3. So what is the demand for escalators in the market at present? Figure 3 is the statistics of escalator products of a company from different angles in the last three years. It can be seen from the figure that 35 escalators account for the majority, at least twice as many as 3 escalators. The reason is very simple. With the same lifting height, 35 escalators occupy less shopping space than 3 escalators, so some profit-oriented businesses prefer 35 escalators.
but will this always be the case? I don't think so. First of all, building a people-oriented harmonious society requires more consideration for passengers, which is not only a safety issue, but also a comfort issue. Furthermore, China's population is aging, the improvement of people's living standards and the continuous improvement of medical equipment and means make people live longer and longer, and the proportion of the elderly population is also increasing. Obviously, the market position of 3 escalator will be further strengthened. Furthermore, can 3 satisfy the future social development? At present, some companies have begun to develop 27.3 escalators.
why is it 27.3 instead of 27 or 27.5? Good question, even some people in the industry may not know it clearly. This problem should be explained by the principle of man-machine structure. The recommended ratio of step height to step distance in Figure 2 is 27.3, and the ratio of step height to step distance commonly used in some buildings is 16/31.
obviously, if escalators are arranged side by side with ordinary stairs in a shopping mall, escalators with 27.3 degrees will look more harmonious. In addition, due to the family planning policy of China and the policy of late marriage and late childbearing, the current general family pattern in China is "1: 2: 4", that is, one child, two adults and four elderly people. In other words, in the future, there will be a situation in which one young person will support six old people on average. Undoubtedly, the burden on young people will become heavier and heavier. Even if there is no economic problem, it will be difficult to achieve in energy, which requires the society to take necessary measures.
There will be a large number of nursing homes and activity centers for the elderly, and the escalators with 27.3 will be of great use. In fact, at present, the use of 27.3 escalators in Japan has been quite large.