The basic components of the electric expansion door are the guideway, the pulley and the transmission belt. Because these three parts are directly related to the operation of the electric telescopic door, they are the vulnerable parts of the electric telescopic door under normal service conditions. Its structural design, material quality, machining accuracy, installation and adjustment accuracy determine its maintenance requirements and service life. The life of electrical components of the electric expansion door is mainly related to improper use and accidental accident.

长期以来，电动伸缩门滑轨的设计完全不同于非电动伸缩门滑轨的设计。后者通常有两道水平方向的平行滑轨，两个(或四个)滑轮通过中间的连接件与悬挂的移动门体相连，移动门体的重心恰好在两道滑轨的支撑力之间，形成稳定的"正悬挂"，这种稳定的结构可以达到很好的稳定性和静音效果。但是，电动伸缩门的滑轨由于要兼顾与门框的固定、门体吊挂及调节、电气组件的安装和外饰盖板的安装等功能，所以最简单的办法就是将滑轨设计成单侧滑道，门体在一侧通过滑轮侧向吊挂在滑轨上，形成侧悬挂。这种设计的优点是安装和调节门体方便、维修也容易。但是，这种设计有许多弱点。

For a long time, the design of the sliding rail of the electric telescopic door is completely different from the design of the non electric expansion gate slide. The latter usually has two horizontal parallel slide, two (or four) pulley through the middle of the connecting piece and the suspension moves the door body, the door body is between the movement of the center of gravity in the two rail supporting force, forming a stable "hangs", this stable structure can achieve stability and the mute effect is very good. However, the electric telescopic door slide due to both the fixed and the door body and the door frame hanging and adjusting, electrical components are mounted and the exterior cover installation and other functions, so the simplest way is to slide into unilateral slide, door body in side by side hanging pulley on the sliding rail, forming lateral suspension. The advantage of this design is that it is easy to install and adjust the door, and it is easy to repair. However, there are many weaknesses in this design.

所以使用这种电动伸缩门必须注意保养和维护滑轮与导轨上部间隙容易使门体滑落，使用的安全性得不到保证。所以选择这种电动伸缩门必须注意电动伸缩门的抗风压强度。这种不稳定的运行使驱动器负载不断变化，对电气组件的使用寿命影响极大。侧悬挂结构，对门体向上的支撑力都在一条线上，门体重心由于安装精度的误差和风力的影响．使门体不仅形成静态侧摆也产生动态侧摆。为此．这种电动伸缩门门体下部的导向块，通常称为"止摆块"，就使用一种轴承，轴承直径小于门体下部导槽，使门体在两方向摆动的条件下依然可以运行。这种侧摆产生的震动在使用效果上表现为噪音，其后果必然导致滑轮和导轨的磨损。

Therefore, the use of this electric expansion door must pay attention to maintenance and maintenance of the upper clearance between the pulley and the guide rail easy to slide, the safety of the use is not guaranteed. Therefore, the choice of the electric expansion door must pay attention to the anti wind strength of the electric expansion door. This unstable operation makes the drive load constantly changing and has a great impact on the service life of electrical components. The side suspension structure has a supporting force on the door body upward, and the center of gravity of the door body is affected by the error of installation accuracy and the influence of wind force. It makes the door body not only form static pendulum but also generate dynamic side swing. For this reason, the guide block at the lower part of the door of the electric telescopic door is usually called the "stop swing block", and a bearing is used. The bearing diameter is smaller than the lower guide slot of the door body, so that the door body can still operate in the two directions of swing. The vibration produced by this side pendulum is expressed as noise, and the consequences will inevitably lead to the wear of the pulleys and guideways.