单巷长距离快速掘进通风系统风筒吊挂技术

Single lane long quick tunneling ventilation system ram hang technology research

神华煤炭集团大柳塔煤矿单巷长距离快速掘进系统因通风系统不合理造成工作面除尘效果不佳,掘进机司机工位处粉尘浓度超标。针对这一问题,提出一种基于风筒吊挂动态延伸技术的解决方案。根据恒力液压绞车钢丝绳预紧风筒吊挂装置的结构与工作原理,建立风筒吊挂受力数学模型,计算得钢丝绳最小破断拉力F_0为150 k N,安全系数为2.73。考虑防风筒吸瘪、绞车夹绳等关键技术,设计风筒吊挂工艺。现场实验表明,该装置能够适应快速掘进系统,有效改善掘进工作面的通风状况,降低掘进机司机工位处粉尘浓度达50%以上。

This paper seeks to address the excessive dust concentration to which tunnel machine operators are exposed as a result of poor dust removal effect resulting from the unreasonable ventilation system, as is typical of the working faces of single lane long-distance quick tunneling system employed in Daliuta Coal Mine in Shenhua Coal Group Corporation Limited. The paper proposes a solution building on the dynamic extension technology of the ram hangs. The solution is achieved by applying the working principle on which the constant force hydraulic winch ram hanging device which using wire rope preloaded is introduced; developing mathematical model by which the ram hangs are subjected to forces, determining the minimum breaking force：150 k N and safety factor：2.73 in the steel wire rope; and designing the ram hang technology in response to key technology such as preventing the ram suction and winch rope squeeze. Field test shows that the device provide a better adaptability to a fast driving system, an effective improvement in the ventilation of the tunneling working face, and thus an over 50% reduction in the dust concentration to which operators are exposed.