求翻译：其原理就是将常规抽油泵的固定凡儿设计在泵筒上部，泵筒内的柱塞上，下各有一个游动凡儿，实现柱塞通过下部动力直接驱动，往复运动完成抽汲。如下图：是什么意思？

The principle is the conventional pump where the children in the top of the pump barrel, the plunger of the pump barrel, each under a swim where the children, to achieve the plunger through the lower part of the power to directly drive the reciprocating motion to complete the swabbing. As shown belo

Their theory is that the pump will be the conventional fixed where a child care design on the pump, the pump barrel and top of the plunger in on the next, and the roving where there is a plunger for child care, through the power of reciprocating motion direct drive, complete withdrawals. As shown in

Its principle is fixes the conventional oil pump every son design on the pump tube, in on the pump tube plunger, gets down has one to hover respectively every son, realizes the plunger through the lower part power direct drive, the reciprocal motion completes the pump.Following chart:

Its principle is a regular pump of fixed design in the upper portion of the pump cylinder, pump barrel columns in North of the Great Wall, where each has a walk under, achieving piston driven directly by a lower power, reciprocating motion complete the swabbing. The following figure:

正在翻译，请等待...