In order to improve the safety and reliability of power grid’s live operation,a robotic device,which automatically coated insulating glue,was proposed to achieve uninterrupted insulation of overhead bare conductors.By analyzing the effects of the convergence angle,inner diameter of the hose,and the working parameters of the glue injection on the coating quality of the robotic device’s glue injection system,the simulation study was carried out;the distribution laws of the pressure field and speed field of the glue injection system were obtained.The multi-objective genetic algorithm was used to solve the optimization problem of the key technical parameters of the coating operation.The optimal structure and working parameter combination of the robotic device’s injection system were obtained by taking the large hose outlet pressure,glue dispensing speed,and better colloid flow stability as the optimization goals to improve the coating quality of the glue injection system.Experimental results show that with LGJ-120/20 specification wire as an example,when the glue injection barrel convergence angle is about 23° and the glue injection pressure is about 1.925×105 Pa with a 12 mm pipe diameter,it can achieve better coating quality and meet the requirements of safe and reliable power grid live operation.