| 摘要 |
<p>Pumping unit with dynamic counterweight for oil extraction which comprises a pumping unit (1) with the particular feature that it has a dynamic counterweight (2) positioned on an oscillating arm (3) connected to the main beam (4) by means of an upper piston (5) which, by virtue of a hydraulic control (6), communicating with presence sensors (7) and a charge valve (8), allows joint actuation with a reciprocating hydraulic device (9) journalled (10) to the column (11) and the main beam (4), in such a manner that movement of the dynamic counterweight (2) uses the force of gravity and an auxiliary hydraulic system (12), or any other system, for moving the head (13) of the pumping unit (1) upwards and downwards.</p> |
