... ( ) S W W S W S W W A A A l r r l r d u w ) 2 ( 2 2 ′ + ′ = ′ + ′ + ′ = + = 有杆泵采油 （1）游梁平衡(beam balance) 在游梁后臂上加重物W b ＝？
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在曲柄平衡抽油机上平衡块位于旋转的曲柄上，而在游梁平衡抽油机上平衡块位于井的相对一端的游梁上。
It is located on a rotary crank on a crank-balanced pumper and can also be located on the walking beam on the end opposite the well on a beam balanced pumper.
游梁平衡抽油机由于其自身结构特点，在运行过程中，连杆上接头与横梁连接部分经常会出现振动和响声。
As its structure character of beam pumping unit, vibration and noise happen on the joint of connection rod head and beam during operation.
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