The authors think that the planetary gear pumping unit can work with long stroke or ultra-long stroke as the blue ele phant, it is characterized by impact structur...
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美
- 認為行星齒輪抽油機與無(wú)游梁抽油機一樣，可以實(shí)現長(cháng)沖程或超長(cháng)沖程，具有結構緊湊、體積小、重量輕和移運方便的特點(diǎn)，它克服了無(wú)游梁抽油機在換向方面存在的弊端，具有換向可靠性高和使用壽命長(cháng)等優(yōu)點(diǎn)。
