Research On The Flexibility Of Power Head Reversaland Lifting Cinoound Action Of The Rotary Dig Drill

In recent years,as the rotary drilling rig has become the most widely used pile engineering machinery products,the market demand for the construction efficiency and manual operation experience of the rotary drilling rig is increasing.At present,when the existing model rotary drilling rig does the compound action of the power head reversal and the main winding lift,the unreasonable system control leads to its flexibility to be improved.The main performance is that the operator will feel the sense of frustration brought by the fluctuation of the power head speed when reversing the compound operation of the operation,the main coil speed is too low,and the operator may occur in different operation modes.To solve the above problems,the flexibility of the models are studied as follows:First of all,through the analysis of the principle of the hydraulic system of the rotary drilling rig and the cause of the rod,the flow distribution characteristics of the existing system are clear,so as to improve the stability of the power head speed,improve the main winding speed and the operation of the rod are the optimization goals of the composite action.The system closed-loop control mathematical model is established through the optimized pump and valve matching control scheme,and the optimized system flow distribution characteristics are obtained,including the power head speed stability,including system internal parameters and external environment variables.After that,the simulation model of the composite action system is built through AMESim to explore the system flow distribution characteristics of the system under different opening degrees of the main valve of the power head,and quantitatively analyze the influencing factors of the stability of the power head speed.On this basis,the power head target speed is defined,and then the simplified control of reverse up operation and fuzzy adaptive PID control are proposed as the composite action flexibility optimization scheme.Using MATLAB and AMESim combined simulation to verify the feasibility of the optimization scheme,the simulation results show that the simplified control of the reverse operation by processing the amplitude Angle and other parameters,and then ensures the main winch on the lifting lever,and improves the operation simplicity.While the fuzzy adaptive PID control improves the main winding speed,the relative speed change rate of the power head is reduced,which improves the stability of the power head speed.Finally,the whole machine test is carried out on a certain type of domestic rotary digging drill to verify the effectiveness of the optimal control strategy of compound action flexibility.Under the operation of the power head handle and the main roll handle,the change rate of the relative speed of the power head is reduced by about 48%,the stability of the power head speed is improved and the operation is improved;The overall upward speed of the drill pipe increases by 40%,the upward speed of the second rod is increased by 37%,and the total time of reverse and lifting up is close to 10.5s.On the premise of not jamming the rod,the stability of the power head speed is improved,and the main winding speed is improved.