BJ121型轻型载货汽车驾驶室原为帆布顶蓬,货箱为敞开式。为了使用方便扩大使用范围,现在用户普遍将驾驶室和货箱部分改装成铁皮厢式,其外貌见图1。但是改装后,一般正常使用一年左右,翼子板就多处发生断裂(见图2中1、2、3、4处),严重的将使整个翼子板报废,这种现象相当普遍。 BJ121 light truck cab was originally a canvas roof, cargo containers for the open. In order to facilitate the use of expanding the scope of use, users are now part of the cab and cargo boxes generally converted into a metal box, the appearance of Figure 1. However, after modification, the normal use for about a year, the fender fracture occurred in many places (see Figure 2, 1, 2, 3, 4), will seriously scrap the entire fender, this phenomenon is quite common.