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随着技术的不断发展,上世纪90年代中期以前安装的一些交流双速电梯和可控硅调压调速电梯以及直流电梯,由于控制方式落后、故障较频繁、维修保养不便、能耗较大、舒适感较差等原因,越来越难以满足人们的使用需要。为了达到既节省经费,又安全可靠的目的,许多用户选择了电梯改造。10年来,电梯改造市场越来越大,但到目前为止,我国还没有形成一套对电梯改造的统一规定,因而电梯改造市场比较混乱,出现了不少问题。
With the continuous development of technology, some AC double-speed elevators and SCR voltage-controlled elevators and DC elevators installed before the mid-1990s, due to the backward control mode, frequent faults, inconvenient maintenance and large energy consumption , Less comfortable and other reasons, more and more difficult to meet people’s needs. In order to save money, but also safe and reliable purpose, many users choose the elevator transformation. In the past 10 years, the market of elevator renovation has been getting bigger and bigger. However, up to now, there is not a set of uniform regulations for the renovation of elevators in our country. Therefore, the market of elevator renovation is rather chaotic and many problems have appeared.