Study On Mechanical Properties And Optimization Of Working Device Of Rotary Drilling Rig

Rotary drilling rig is one of the complex equipment with high level of mechanical, electrical, hydraulic integration. To the several decades of development history in the foreign countries, rotary drilling rig in China is still in its infancy, and there are still many deficiencies. At present, domestic rotary drilling rig mainly rely on relatively low prices to share with imported rotary drilling rig. The competition in the technology of them is still relatively weak. The study on the mechanical properties of the working device of rotary drilling rig is not deep enough, and there are a number of key theoretical and technical problems to be further studied. In order to improve the technology of domestic rotary drilling rig, supported by the national863project,"computer-controlled high-performance rotary drilling rig research, development and industrialization", Hunan provincial innovation foundation for postgraduate and the Graduate degree thesis innovation foundation of Central South University, the paper focused on the studies of the mechanical properties of the working device of rotary drilling rig and the optimization designs. The main research works are as follows:(1)The structure of rotary drilling rig was analyzed, the working principle of rotary drilling rig was introduced and the composition principle of the working device of rotary drilling rig was analyzed.(2) The mechanical models of the working device which is a spatial statically indeterminate structure including hydraulic executive elements under drilling conditions were set up. Some simulation models based on MATLAB were set up and simulated in Simulink. Some useful results were obtained by analyses to the mathematical models and the simulation results. So the optimization design of the luffing mechanism has the theoretical basis.(3)The mathematical models of several types of lift-arm luffing mechanism were established and the corresponding simulation models based on MATLAB were set up and simulated in Simulink. When the lift-arm is below the connecting rod with the hydraulic cylinder of lift-arm is below the lift-arm, the lift-arm luffing mechanism will show better dynamic behavior.(4) The mathematical models of the internal forces of mast were set up. In order to study the influences of the position of driver, and the hinge point between the mast luffing hydraulic cylinder and the mast to the mechanical performance of mast, some simulation models based on MATLAB were set up and simulated in Simulink. Some useful results were obtained by analyses to the mathematical models and the simulation results.(5) The studies to the influence of different installation positions of the main winch to the dynamic properties of the working device and the mechanical performance of the mast were made. The studies showed that it is better when the main winch installed on the swing platform than it is installed on the mast.(6) The dynamic optimization models of the lift-arm luffing mechanism and the mast luffing mechanism were set up respectively, some optimization designs were made based on Genetic Algorithm. The parameter optimization model of the mast was established, the optimization design was made in ANSYS.(7) The hydraulic press of the lift-arm luffing hydraulic cylinders and the mast luffing hydraulic cylinders, and the stress of the mast were tested respectively on SWDM-22rotary drilling rig. The theoretic analyses were verified by these tests.In a word, the mechanical performance of the working device of rotary drilling rig was studied and some optimization design was made.