| 摘要 |
<p>This invention relates to an oil pumping unit with a counterweight whose centroid can be adjusted comprising: a power supply (1), a belt transmission mechanism (3), a speed reducer (4), a crank (5), a connecting rod (6), a cross beam (10), a curved walking beam (8), a horsehead (9), a cable hanger (11), a post (14), a base (2) and a counterweight (15), characterized that the centroid of the counterweight (15) can be adjusted. According to one preferred embodiment of the invention, the counterweight (15) comprises at least two linking bars (22) in the front of the counterweight (15). The centroid of the counterweight (15) can be easily adjusted by attached one of the linking bars (22) in the front of the counterweight to the different hooks (23.1) on the end of the curved walking beam (8).</p> |
