由机电部牡丹江北方工具厂设计所,牡丹江平安企业公司西林石油机械厂研制的CZ12-6型齿轮增程式长冲程抽油机于1989年9月通过了评审。该机采用四连杆换向机构,借助齿轮传动将天车轮的摆角放大。使固结于天车轮的钢丝绳往复缠绕和脱开,实现悬点的往复直线运动,平衡系统采用上下直线往复移动的砝码式机械重量平衡。从1989年6月到 The CZ12-6 gear-extended long-stroke pumping unit developed by the Mudanjiang North Tool Factory Design Institute and the Mianjiang Pingan Enterprise Xilin Petroleum Machinery Factory passed the assessment in September 1989. The machine uses four-link reversing mechanism, with the gear drive day wheel swing angle amplification. So that the rope fixed to the day wheel winding back and forth and off, to achieve reciprocating linear motion of the hanging point, the balance system using reciprocating up and down linear weight mechanical weight balance. From June 1989 to