三个型号都要从工况开始 Start with conditions for all three models
巨力风动YT27、YT28和YT29A都属于气腿式凿岩机候选。先确定岩性、孔径、孔深、作业方向、现场空间与供气条件，再使用参考参数缩小范围。 YT27, YT28 and YT29A are air-leg candidates. Establish rock, hole diameter/depth, direction, space and air supply, then narrow the options using reference specifications.
参考参数只用于初筛 Reference data is for initial selection only
YT27、YT28与YT29A可比较参考重量、长度、孔径、耗气量和冲击频率，但这些数据不能单独证明哪款效率最高、寿命最长或最适合某种岩石。 Weight, length, diameter, consumption and frequency can be compared, but do not alone prove superior efficiency, life or suitability for a particular rock.
最终配置逐项确认 Confirm the final configuration item by item
巨力风动是正式品牌写法；“巨力风动”仅作为可能出现的误写别名保留，不能替代正式品牌名称。 Use the official Juli Fengdong brand name consistently; possible misspellings must not replace the formal name.
- 主机型号与数量 Machine model and quantity
- 气腿、注油器和钎具 Air leg, lubricator and drilling tools
- 供气条件与同时开机数量 Air supply and simultaneous drill count
- 铭牌、包装和随货清单 Nameplate, packaging and packing list
- 价格、交期和质保逐单确认 Confirm price, delivery and warranty per order