求翻译：针对山西焦化股份有限公司焦油加工装置改质沥青液下泵故障频发，严重影响改质沥青装置稳定运行，致使焦油加工装置不能满负荷运行的问题。通过对液下泵故障原因及改质沥青的特性分析，提出将改质沥青液下泵由长轴泵改为短轴泵，并进一步优化短轴泵的结构，从根本上解决了沥青液下泵制约生产的瓶颈问题，从而保证改质沥青系统的稳定运行。是什么意思？

Tar processing device for Shanxi coking company limited under the liquid of modified pitch frequent pump failures, seriously affecting stable operation of modified pitch equipment, resulting in tar processing device not running at full capacity problems. Through the submerged pump fault analysis of the causes and characteristics of modified pitch, made the liquid pump of modified pitch from long to short axis axis pump pump, pump structure and further optimize the short axis, fundamentally resolve the submerged pump bottleneck in restricting the production of asphalt, thus ensuring stable operation of the system of modified pitch.