SH30型钻机(无锡产品)的调速换挡,系通过脚踩踏板,使钢丝刹车线产生线位移,将弹簧压缩,达到离合器的锥度动盘与锥度定盘脱开,然后进行换挡调速。这种操纵机构,经常发生动盘脱不开定盘,致使操作人员不得不采取停车换挡,或不停车而强行换档。这样,机件损伤较严重,维修工作量大,影响生产进度和安全。分析其原因, SH30-type drilling rig (Wuxi products) of the speed shift, the Department of foot pedal, the wire brake line to produce line displacement, the spring compression to reach the clutch tapers moving plate and taper plate disengaged, and then shift speed . This control mechanism, often occur in the fixed plate can not be fixed, resulting in the operator had to take a parking shift, or forcibly shift without stopping. In this way, mechanical damage is more serious, heavy maintenance workload, affecting the production schedule and safety. Analyze its reason,