| 摘要 |
The present invention discloses a counterweight structure for vertical oil pumping unit, which adopts the assembled weight box structure, wherein each set of weight boxes is configured by connecting an upper box, an upper-middle box, a lower-middle box and a lower box, wherein the upper box and the upper-middle box, the lower-middle box and the lower box are respectively connected through bolts, and wherein a hanger rod is fixed on the downside of the upper-middle box and a hook rotatable on the rotating shaft is mounted on the upside of the lower-middle box, which connects with the upper-middle box by hanging over the hanger rod via the hook. The present invention employs the structure of connecting by the hook and hanger rod among each set of weight boxes and between the upper-middle box and lower-middle box of each set of weight boxes. The present invention is thus not only able to adjust the counterweight without employing cranes or other large-scale hoisting devices, but also featured by reliable connection, convenient operation, saving time and labor and repeatable use.
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