CKD9型机车是大连机车车辆有限公司根据巴基斯坦铁路要求设计制造的干线客、货运两用内燃机车。
CKD9 locomotive, designed and manufactured by Dalian locomotive and Rolling Stock co., Ltd. for Pakistan Railway, is a trunk passenger and freight diesel locomotive.
对DF 11型内燃机车按单司机值乘进行了改进设计，介绍了改进原则、工作原理和改进方案。
The improvement design is carried out for DF11 diesel locomotive with single driver operation. The improvement principle, working principle and program are introduced.
以DF7C型内燃机车锻件中的杯形零件之一——气缸螺栓保护螺母为例，进行温挤压工艺研究，并据此设计出了成形模具。
Taking cylinder nut-protected bolt, one of the cup-shaped parts in the forging parts of DF7C gas engine, as an example, the warm extruding is researched, accordingly, the forming die is designed.
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