Design And Analysis Of Worm Gear Transmission Pumping Unit

Aiming at the low permeability or ultra-low permeability oil wells in northern Shaanxi,a new design scheme of drive pumping unit is put forward.The scheme is improved according to the actual working conditions,and the structure and working principle of the pumping unit are explained.The main contents are as follows:Firstly,the calculation of the basic parameters of the worm gear transmission pumping unit was completed;the selection of variable speed motor,pulley,coupling and bearing parts,the design of key parts such as worm gear reducer and reversing mechanism were completed.The 3D model design of the pumping unit parts and the assembly of the whole machine were completed by using the software Solidworks.Secondly,a finite element analysis was carried out on the key components of the pumping unit.The contact stress analysis of the worm gear,the bending stress analysis of the gear root and the contact stress analysis of the rack and pinion are completed.The modal analysis of the gear shaft is completed,and the lowest natural frequency of the gear shaft is much higher than the working frequency of the pumping unit,the gear shaft does not resonate;the linear buckling analysis of the frame is completed,and the minimum critical load of the frame is much larger than the sum of the load of the pumping point and the upper part of the machine,and the pumping unit has good stability during operation.After that,the kinematic model of the worm gear transmission pumping unit was established,and the influence of the stroke and ring gear radius on the performance of the pumping unit was analyzed.The larger the stroke,the larger the maximum speed and the maximum acceleration of the pumping unit suspension point.However,there is no influence on the ratio of the uniform movement time of the pumping unit;the larger the radius of the ring gear,the larger the suspension stroke and the maximum speed,but the smaller the acceleration,the smaller the proportion of the uniform movement time of the pumping unit;The performance of the beam pumping unit and the worm gear transmission pumping unit reduced the volume of the worm gear transmission unit by 27%,the overall machine qualityby 15.7%,and the transmission efficiency by 2.25%.Finally,the calculation of the suspension point load of the worm gear transmission pumping unit and the analysis of the influencing factors of the suspension point load are carried out,and the static load has the greatest influence on the suspension point load,followed by the inertial load and the friction load.The two types of pumping units are compared and analyzed.The suspension point load shows that the change trend of the suspension load of the two types of pumping units is the same,but the variation of the suspension point load of the beam pumping unit is greater than the variation range of the suspension point load of the worm gear transmission unit;the worm gear is established.The single-degree-of-freedom equivalent dynamic model of the transmission pumping unit shows that the maximum influencing factor of the net torque of the output shaft of the pumping unit is the suspension load,followed by the gravity of the reversing mechanism and the inertial force of the reversing mechanism.