近几年,底架承载敞平车中梁下挠、裂纹、折断的质量问题经常发生。尤其是C_1型底架最多,其次为C_6型和中梁为450毫米工字钢的C_(50)型(其中以316、330及335型最突出)。虽然对以上车型作了必要的加强改造,情况有些好转,但仍未彻底解决。综合分析有以下几种原因:1、原设计结构不合 In recent years, the chassis carrying open car beam deflection, cracks, broken quality problems often occur. In particular, the C_ (50) model with the C_6 type and the 450 mm I-beam with the C_1 type of undercarriage being the largest, of which the models Nos. 316, 330 and 335 are the most prominent. Although some improvements have been made to the above models, the situation has been somewhat improved but it has not yet been completely solved. Comprehensive analysis of the following reasons: 1, the original design structure