1伸缩门是靠机头驱动部分来带动整个门体伸缩运行，因此机头底板的重量及强度尤为重要。目前市场上有三种底板：水泥底板、薄铁底板、铸铁底板。水泥底板有重量但没有强度；薄铁底板有强度但没有重量；超厚的铸铁底板既有重量又有强度。

1 retractable door is driven by the nose part to drive the whole door to expand and run, so the weight and strength of the head plate is particularly important. At present, there are three kinds of floor boards in the market: cement floor, thin iron floor and cast iron floor. The concrete floor has weight but no strength; the thin iron floor has strength but no weight; the super thick cast iron floor has both weight and strength.

优质品牌的襄阳伸缩门厂家理想采用超厚铸铁材质制作底板，对于较长的伸缩门，还会按比例增加配重，使伸缩门运行更加平稳。

The Xiangyang expansion door factory of high quality brand uses the super thick cast iron material to make the floor. For the longer expansion door, it will increase the weight according to the proportion, so that the operation of the expansion door is more stable.

2伸缩门的斜杆结构决定着伸缩门的整体性及直线性，斜杆贯穿于主直杆数量越多，整体性及直线性越好。

2 the slanting rod structure of the retractable door determines the integrity and linearity of the telescopic door. The more the inclined rod runs through the main straight bar, the better the integrity and linearity.

当然，客户也可以通过每跨主直杆之间斜杆拼成的方格数量来判断，方格越多，伸缩门的整体性和直线性越好。

Of course, customers can also judge the number of squares formed by the diagonal bar between the main poles of each span, and the more the squares, the better the integrity and linearity of the telescopic doors.