推土机前机罩刚性变形的原因分析与改进措施

Casual analysis on rigid deformation of front cover of bulldozer and improvement measures

通过理论分析和现场测试发现,推土机铲刀在极限位置倾斜操作时,由于2个提升液压缸不能自由伸缩导致自由度受限,一方面引起了局部管路压力过高,产生安全隐患,另一方面造成了前机罩、耳轴等薄弱结构件的刚性破坏,严重影响了推土机的可靠性及使用性能。在测试基础上,通过计算分析,提出在提升液压缸和工作阀之间增加安全溢流阀,同时提高前机罩的抗扭曲强度及其他薄弱环节的强度,有效解决了存在问题。推土机前机罩产生刚性变形是自由度受限所致的观点,为以后推土机的结构设计及性能优化提供了参考。

After theoretical analysis and field test, it was found that when the bulldozer blade was operating obliquely at limit position, the two lifting cylinders cannot freely telescope, which led to limited freedom degree. Therefore, on the one hand, the pressure of local pipeline rose highly so as to bring about hidden safety hazard, on the other hand, the structurally weak components such as the front cover and the trunnion were rigidly damaged, which seriously affected the reliability and the service performance of the bulldozer. On the basis of the test and the calculation analysis, it was proposed to add the safety relief valve between the lifting cylinder and the working valve as well as improve the anti-twist strength of the front cover and the strength of other weak components, thus the problem was effectively solved. The standpoint that the rigid deformation of the front cover of the bulldozer was caused by the limit of the freedom degree offered reference for the structural design and the performance optimization of the bulldozer.