| As the world economy is increasingly depended on energy,oil and gas resources as a strategic resource,has a significant impact on national security,deep drilling and ultra deep drilling technology has been focused more and more.In recent years,drilling engineering in our country encountered the problem of slow drilling rate in deep well high abrasive formation,which put forward higher requirements for drilling equipment and technology research.With the widespread application of downhole dynamic drilling tools in deep well drilling,the screw drilling tools have encountered some technical problems,such as poor temperature resistance,poor repair,small torque at high rotational speed,and great influence on storage performance.Because of no rubber parts,the performance of the downhole drilling tool is relatively stable,at the same time,the advantages of the turbo drill gradually highlighted,such as output performance is not affected by the length of storage time,easily repair,long service life etc.Matching the speed reducer to the turbine tool to reduce the speed and increase the twist of the drill tool can enhance the matching between the drill and the drill bit.After the study and the accumulation of many years,scholars at home and abroad have made great achievements in the research of downhole speed reduction transmission.However,the downhole reducer is affected by the change of deep well drilling conditions,and it is also restricted by the raw material quality,machining level and assembly process of the reducer,there are many defects in the turbine reducer,such as small gear modulus,insufficient gear bending strength,low inertia force and low transmission efficiency,so the present application of the reducer is less.Drilling in deep and difficult formations at home and abroad puts forward the performance requirements of reducing speed and increasing torque.Combined with this demand,the research on the reducer drive of the drilling tool is carried out,and the innovative idea of applying the cylindrical sine movable tooth transmission to the drilling of the turbine tool is put forward.The cylindrical sine oscillating tooth reducer is used in conjunction with the turbine drill,and the cylindrical sine movable tooth reducer can work under the condition of deep radial drilling and high efficiency of transmission,at the same time,the cylindrical sine oscillating tooth reducer can give full play to its advantages,such as compact structure,high meshing rigidity,strong bearing capacity,high transmission efficiency,small radial size and wide range of transmissionratio.So,the movable tooth reduction drive of turbo drill can not only enhance the matching between drill and drill bit,but also can be applied to the limited space of radial environment,meet the requirements of deep drilling working conditions,and effectively improve the drilling speed.Theoretical analysis,numerical analysis,finite element analysis and experimental verification methods have been applied in this paper,the main research work completed on the following 5 aspects,such as the principle of gear meshing,contact stress,elastic approach,dynamic analysis and the prototype.(1)Research on meshing principle of circular oscillating gear drive for turbine drilling cylinderThe meshing principle of circular oscillating gear drive for turbo drill cylinder is studied,and the movement process of movable teeth drive is analyzed.In the turbodrill movable teeth reducer transmission system,turbine power drill and the output end of cylinder sine oscillating tooth transmission input shaft is connected between the movable teeth reducer,ball sinusoidal tracks on the input shaft and shell track sinusoidal gear transmission,driving the movable tooth rack,the low torque high speed input shaft and converted to live gear rack connected with the output shaft of the low speed and high torque.The turbine drill cylinder sine oscillating tooth gear transmission mechanism dimension synthesis,continuous motion conditions and teeth was studied.The degree of freedom and the transmission of the mechanism is calculated,the reasonable input shaft sine raceway cycles,sinusoidal raceway cycles and turning with movable tooth frame input shaft,complete the structural design of the reducer;derived turbodrill cylinder sine oscillating tooth surface equation of transmission function theory,the tooth surface equation is studied by numerical simulation using MATLAB software for tooth surface machining.The research in this part provides a theoretical basis for the research of tooth surface processing,tooth surface contact analysis,tooth surface error measurement and finite element analysis.(2)Study on contact stress of circular cylindrical spur gear driveAccording to the structural characteristics of the cylindrical sine movable gear drive system,the spatial mechanical model of the cylindrical sinusoidal movable teeth drive mechanism is established.On the basis of introducing the deformation coordination equation and the geometric equation,the mechanical analysis of the cylindrical sinusoidal movable gear drive mechanism is carried out,and the numerical solution of the contact force of the movable teeth is solved by using the MATLAB software.The mathematical model of contact characteristic analysis of cylindrical sine oscillating teeth reduction drive is established,and the main factors that affect themeshing contact force is identified,considering transmission turbodrill cylinder sine oscillating tooth drive mechanism and the relationship between the assembly should meet the ratio,not the top profile cutting,continuous transmission and processing and assembly conditions,determine the level of each influence factor.The influence of the main structural parameters of the sinusoidal oscillating teeth drive mechanism on the contact stress is studied by means of orthogonal experimental analysis.Through the range analysis,the sensitivity of the main structural parameters to the maximum contact stress of the meshing pair is determined,and the optimal scheme of each influencing factor is determined when the maximum contact stress is least.The contact stresses of the meshing pairs are solved by the finite element numerical simulation.The agreement between the theoretical results and the FEM results is analyzed,The research contents of this chapter provide a theoretical basis for the determination of the relevant structural parameters and fatigue analysis of the cylindrical sinusoidal oscillating teeth drive mechanism.(3)Research on elastic approach of longitudinal oscillating gear drive for turbine drilling cylinderBetween the turbodrill cylinder sine oscillating tooth gear drive mechanism of movable teeth and the input shaft,the movable teeth frame and the shell mesh will produce contact deformation between the contact parts at the loading position before and after the engagement will produce different spatial elastic approach.In the previous research,the force analysis of the cylindrical sinusoidal movable gear drive system has been carried out.The analysis of the research content based on Hertz contact theory and contact force factors,variation of turbodrill cylinder sine oscillating tooth gear drive mechanism of space elastic approach,analyzes the influence of various factors on the elasticity of each meshing approach.Aim at the minimum of the maximum elastic approach,the optimal scheme combination is given.The finite element analysis of the elastic approach of the cylindrical sine oscillating teeth drive is completed,the consistency between the theoretical calculation results and the finite element calculation results is analyzed,the elastic approaching quantity and its periodic distribution law are obtained when the meshing pair is in different positions.The research of this chapter provides the basis for the research of the transmission performance,lubrication performance,working life and work reliability of the cylindrical sine movable gear drive system.(4)Research on dynamic characteristics of circular cylindrical gear with movable teeth in gear driveA dynamic analysis model of cylindrical sinusoidal oscillating teeth drive system based on equivalent mass method is established.According to the geometry relationship of each meshing pair and the torsional rigidity and dynamic analysis model of each part of the drive mechanism model,the stiffness matrix of each meshing pair is established.On the basis of stiffness matrix of multi degree of freedom Time-Varying Vibration system,The equivalent torsional stiffness and the whole torsional stiffness matrix of the meshing pair of the cylindrical sinusoidal movable teeth drive are analyzed,The stiffness matrix of the whole system is established by combining the stiffness matrix assembly method with the single rigid matrix in the dynamic model.The natural frequencies of the torsion system of the cylindrical sine oscillating teeth drive are calculated in the MATLAB program,The periodic variation law of the equivalent torsional stiffness and the natural frequency of each meshing pair of the movable teeth drive is analyzed.On this basis,the finite element method is used to analyze the modal of the main parts of the cylindrical sine oscillating tooth gear drive.(5)Complete the machining and assembly of the prototype,and carry out the principle experiment using the prototypeOn the basis of the theoretical research of the circular cylindrical spur gear drive(the study of the meshing principle,the study of contact stress,the study of the elastic approach and the study of the dynamic characteristics).According to the requirements of the actual working conditions underground turbodrill reducer,completed the prototype design of turbodrill cylinder sine oscillating tooth gear drive device,and the prototype of manufacturing and processing the assembly,the principle experiments of transmission ratio verification and efficiency test are carried out by using the prototype,the results of the experimental data are analyzed,provide theoretical and technical support for the application of turbodrill cylinder sine oscillating tooth reducer. |
