THE EFFECT OF THE ROTATION DIRECTION OF CRANK ON THE KINEMATIC CHARACTERISTICS AND EXTREME FORCES OF THE RODS SUSPENSION POINT

In article carried out a kinematic study of a new constructive solution of pumping unit, which used in oilfield and the influence of the direction of rotation of the crank on the kinematic characteristics of the rod suspension point and extreme forces in both axial and deaxial-converting mechanisms was evaluated. Studies have shown that, according to the elementary theory, changing of direction of rotation of the crank does not affect the load on the rods suspension point, but according to the refined theory, the direction of rotation of the crank has a significant effect on the operation of the pumping unit. Because in this case, the laws of motion of the rods suspension point is sharply change. In addition, it was found that the fundamental difference between the axial and deaxial-converting mechanisms is due to the change in average speed during the up and down stroke movement of the rods suspensions point. It has been found that on pumping units with positive deaxial-converting mechanisms when the crank rotates clockwise, the rods suspension point moves upstroke faster than when it moves down, or vice versa, when the the crank rotates counterclockwise, the time at which the rods suspension point moves up is later than when it moves down. On pumping units with negative deaxial transforming mechanisms when the crank rotates clockwise, upstroke time of rods suspension point is less than it is downstroke time. And on pumping units with negative deaxial transforming mechanisms when the crank rotates clockwise, the upstroke time of the rods suspension point is longer than when it moves down and vice versa, when the crank rotates counterclockwise, the upstroke time of the rods suspension point is less than when it moves down.