采用MON式主传动系统的新型链条抽油机

New chain pumping unit using MON type main drive system.

采用ＭＯＮ式主传动系统的新型链条抽油机，其主传动链、循环链、承载链分别呈Ｍ、Ｏ、Ｎ形布置。链结子为换向机构，具有滑动轴承功能，并联循环链和主传动链，把循环运动变为上下往复运动。承载链直接承受平衡载荷，可大幅度减小主传动链的受力。主传动链与承载链将悬点载荷分解为换向抽汲载荷与平衡载荷。两组链条长度之差产生差动功能，可缓冲平衡重的换向惯性冲击。ＭＯＮ式主传动系统力系设计合理，运行平稳，可靠性高，从而使新型链条抽油机具有大载荷、长冲程和低冲次的特点。

The main drive chain, cycle chain and bearing chain of the new chain pumping unit using MON type main drive system presented in this article are arranged in M, O, N pattern. The chain link is the reverse mechanism, functions as sliding bearing and makes the cycle chain and main drive chain parallel to change the circulation into reciprocation. The bearing chain bears the equilibrium load to reduce the force on the main drive chain to a great degree. The main drive chain and the bearing chain divide the polished rod load into reverse pumping load and equilibrium load. The difference of the lengths of the two chains produces a differential action to damp the reverse inertia impact of the counterbalance weight. Equipped with MON type main drive system, the chain pumping unit is characterized by large load, long stroke and low pumping speed.