In allusion to the design of pipelines in batch transportation of cool and hot oil and their operation,the effecting factors such as distance,batches per year,relative flowrate,pipeline flowrate and outlet temperature on crude oil\'s flowing safety under operational conditions are reviewed through calculation program of the cool and hot oil batching transportation software.

According to the lubrication way on transmission box of gearwheel for towing machine groups,it is effective to solve the change of hot and cold oil and lubrication of gearwheel box for towing during mining double coal-seam again by technological improvations with the hydraulic system and machine groups to supply oil to gearwheel box and made the way of its to cycle oil.