Abstract: It has been successfulto mploy the planetary differential gear device to function as the automati sychronizer of GCF-1500 percussive reverse-circulation drills.

• 中文摘要: 采用行星齿轮差速机构作为GCF-1500型冲击反循环工程钻机的自动同步机构，已经获得成功。