Theoretical Analysis And Design Of The Non-beam Pumping Unit Of Planetary Gear-ring Type

The non-beam pumping unit of planetary gear-ring type is a kind of new non-beam pumping unit. The planetary gear-ring inverse mechanism is the core component of non-beam pumping unit of planetary gear-ring type, this mechanism is mainly made up of a planetary gear and a inner gear-ring slider consisting of two semi-internal gears and two racks, the planetary gear meshes respectively with the semi-internal gears and racks and drives this mechanism to reciprocate linearly.In this thesis, the author performed further study on the non-beam pumping unit of planetary gear-ring type based on the previous study. The kinematic analysis model has set up for planetary gear-ring inverse mechanism. The mechanical force analysis was also set up for main components of the body.And the optimization design of the mechanisim parameters has been established. Details as follows:The velocity of the slider is the important indicator to measure the efficiency of this pumping unit, and the acceleration of the slider is the key indicator to evaluate the performance of the this mechanism. Based on the meshing analysis of planetary gear and inner gear-ring, the velocity and acceleration calculation model of the slider is established.The angular velocity and angular acceleration of the rod are important basis to calculate the rigidity of the rod. Based on the meshing analysis of planetary gear and inner gear-ring, the angular velocity and angular acceleration calculation model of the rod is established.The simulation of the kinematics was accomplished in MATLAB. And based on this condition, there is a discussion on the effect to the slider's velocity, acceleration, and rod's angular velocity and angular acceleration caused by mechanism parameters. This mechanism are different transmission forms when the planetary gear meshing with the two semi-internal gears. The change process of the slider's speed, acceleration, and rod's angular velocity and angular acceleration is relatively simple and stable when the planetary gear meshing with the right semi-internal gear, but the change process of the slider's velocity and acceleration, and rod's angular velocity and angular acceleration is much more complex when the planetary gear meshing with the left semi-internal gear.Based on the kinematic analysis of the planetary gear-ring inverse mechanism, the mechanical force analysis model of the slider and rod is established when planetary gear meshing with the inner gear-ring. And rigidity calculation model and rigidity condition of the rod is also established here. It provides an important calculate basis for design section shape and size of the rod.Based on the analysis above, the optimization design of the planetary gear-ring inverse mechanism is put forward which the minimum acceleration change range and the starting point of the drive are taken into consideration, by using the MATLAB optimization toolbox, the mechanism parameters were optimized , and examples of the solution is given.Through the research, the author confirmed that the non-beam pumping unit of planetary gear-ring type is simple in structure, reliable in use, and convenient in maintainability. Furthermore, it is of high performance, resulting from long stroke, large displacement and heavy load pumping unit, the gear-ring slider can be assembled, so resulting in a flexible adjustment of the stroke according to the actual situation of production for meet the needs of production...