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针对现场应用的推力球轴承式抽油杆防脱扣装置经常失效的现状，研制出一种新型抽油杆防脱扣装置。这种装置采用类似球形关节的旋转机构，消除了抽油杆柱上下往复运动产生的倒扣扭矩；在短节下端设计有10°的内圆锥表面，使转轴能够在10°范围内自由转动，从而有效地消除了由于井身弯曲而产生的轴向弯曲应力。现场应用表明，这种装置零部件少，强度高，结构简单合理，能适应井下抽油籽往复杂的受力条件。
In view of the fact that thrust ball bearing sucker rod anti-tripping device of field application often fails, a new sucker rod anti-tripping device has been developed. This device uses a spherical joint rotation mechanism to eliminate the up and down the sucker rod up and down reciprocating torque generated in the lower end of the short section is designed with 10 ° inner cone surface so that the shaft can rotate freely within 10 °, Thus effectively eliminating the axial bending stress caused by the well body bending. The field application shows that this device has few components, high strength, simple and reasonable structure, and can adapt to the complicated stress conditions of underground pumping oil seeds.