长距离大坡度下运带式输送机在孟家窑煤业的应用

Hidden hazards in down-going long distance and large slope belt conveyor and the control measures

下运带式输送机设计一般采用驱动部设在机尾,卸载滚筒及张紧部设在机头的布置方式,机尾段标高高于机头段标高,输送机逆向运转,物料通过输送带沿下运倾角自上而下进行运输,物料重力势能通过输送带传动,转化为电机的逆向旋转动能,再通过四象限变频器装置转化为电能回馈电网。通过长时间实践管理,针对《煤矿安全规程》关于下运带式输送机,机软制动、防超速、防物料下滑滚落,防护网、四保护两装置使用实践,特别对于长距离、大坡度下运的特殊工况,提出了一些应对解决下运输送带制动、失速、断带、物料下滑等重大安全缺陷的解决办法,并对下运带选型设计要求进行了补充完善,可供相关设计和管理使用单位进行参考。

The design of the down-going belt conveyor generally arrange the driving part at the end of the machine,and the unloading drum and the tensioning part at the head,the elevation of the tail section is higher than that of the head section,the conveyor runs in reverse,and the material passes through the conveyor belt.It is transported along the downward inclination angle from top to bottom,and the gravity potential energy of the material on conveyor belt converts into the reverse rotation kinetic energy of the motor,and then converts into electrical energy feedback into the grid through the four-quadrant inverter device.Through long-term practice,aiming at the items about down-going conveyor belt in“Coal Mine Safety Regulations”,including the machine soft brake,overspeed prevention,material falling prevention,protective nets,and the application of the four protection devices,especially for the long distance,large slope downward transportation,some solutions are proposed for the major safety defects such as belt braking,stalling,belt breaking,and material slippage,and the requirements for the selection and design of the lower conveyor belt are supplemented and improved,which can offer references for relevant design and management units.