Design And Research On Hydraulic System Of Girth Drilling Rig

With the increase in the length of tunnels in our country,the view of equal emphasis on tunneling efficiency and automatic tunneling has become increasingly prominent in safe tunneling,especially where non-blasting drilling methods are required.The girth drilling rig has significant advantages in terms of vibration,noise,precise control,and static tunneling and drilling.At present,there is almost no design of the hydraulic system of the girth drilling rig.Based on the mechanism of girth cutting and the requirements of positioning function,this paper studies the traveling hydraulic system,translational rotary hydraulic system and propulsion drilling hydraulic system of the girth drilling rig,and simulates the hydraulic system with AMESim simulation software.(1)First,by analyzing the design indicators and actual working conditions of the girth drilling rig,the design schemes of the girth drilling rig traveling hydraulic system,translational rotary hydraulic system and propulsion drilling hydraulic system are determined.According to the actual working conditions,the efficiency of the hydraulic system of the drilling rig is analyzed.The mechanical analysis of the traveling hydraulic system is carried out to obtain the maximum traction force of the drill rig under different working conditions.(2)Secondly,according to the analysis of the mechanism of each action and the hydraulic control mode,the principle diagram of the overall hydraulic system of the drilling rig is designed,and the hydraulic parameters of each module are analyzed and calculated.Moreover,calculation and selection of key hydraulic components in the circuit,such as hydraulic cylinders,rotary drives,walking motors,and hydraulic pumps,are carried out.(3)Finally,the AMESim simulation model of the key component loop,walking loop,translation and rotation loop and propulsion drilling loop of the girth drilling rig is established and simulated.The working conditions of the up and down slopes of the girth drilling rig and traveling on flat ground are simulated,the analysis of the response curve of the traveling hydraulic circuit verifies that the traveling hydraulic motor is stable in time after fluctuations in action,which meets the working conditions and design requirements.During the positioning process,the cooperative operation conditions of the translational and rotary hydraulic system were simulated.By analyzing the characteristic curves of each actuator,the stability and reliability of the mutual cooperative action of the five positioning actuators was verified.In the drilling work,the variable load working conditions of the drill barrel of the propulsion drilling hydraulic system were simulated,and different response curves of the working device were obtained.The load-sensitive variable pump based on the pressure compensator behind the valve has an ideal effect on solving the impact of variable load of the drill barrel,and has a strong speed rigidity.And the anti-flow saturation capacity of the hydraulic system of the working device is basically the same as the expected value of the design.The above research verifies that the system design meets the requirements,and provides methods and ideas for the design and research of hydraulic systems of similar construction machinery.