Research On The Belt Automatic Tension System Of Beam Pumping Unit

The skidding phenomenon of the belt of the beam pumping unit will not only cause the motor’s power output in time,but also affect the pumping efficiency of the pumping unit.It will also cause the rubber deformation and deterioration of the belt surface,and eventually burn the belt.In the past research on belt tensioning for pumping units focused on the design of the mechanical structure and it was necessary to manually tighten the belt according to the worker’s experience.Aiming at the automatic tensioning of the belt of the beam pumping unit,a system that can realize the real-time monitoring of the belt transmission parameters and the automatic adjustment of the tension force is designed in this paper to prevent the slipping of the belt.Firstly,according to the characteristics of the belt drive of the beam pumping unit,compared with various belt tensioning methods and testing techniques,it is determined that the "cross-coordinate" method in the non-contact tensioning method is used to adjust the center distance of the belt pulley and the belt pulley is determined.The difference in speed is the principle of indirect detection of the tension of the belt,thus determining the design of the automatic tensioning system of the pumping belt.Secondly,according to the mechanical characteristics of the belt drive of the beam pumping unit,the tension range of the system is determined,and the main transmission parts,such as the spiral pair and the worm pair in the parallel displacement mechanism,are designed.The dynamics and kinematics simulation of parallel displacement mechanism is carried out by ADAMS.The influence law of the worm wheel’s material on the main engaging force of the parts and the variation rule of the kinematic parameters of the transmission mechanism are analyzed,it also verifies the rationality of material selection and mechanism design of worm gear Using ANSYS Workbench to perform pre-stressed modal analysis on the main drive components of the parallel displacement mechanism,determine the vibration mode and frequency of the main drive components and propose a corresponding optimized solution.At the same time,the module is designed for the detection of the system and the drive output of the motor;the response curves of the Bode diagram and the unit step response are plotted according to the transfer function of the system,from which the stability of the system is judged.Finally,according to the requirements of the design,the prototype of the laboratory was assembled and the system was installed in the actual working environment.Based on the actual test parameters,the optimal range of the real-time slip rate of the belt that should be controlled by the belt tensioning system is determined,and the optimization scheme for the drive control of the tensioning mechanism and the motor in the system is proposed.The simulation and test analysis of the parallel displacement mechanism and control system of the motor of the pumping unit can prove that the automatic tensioning system of the belt of the beam pumping unit can meet the requirements of the real-time monitoring and display of the belt drive without increasing the extra wear and wear of the belt,and can realize the automatic press belt as a certain amount of contraction.