Combined PDC-thrust ball bearing long-life transmission shaft assembly

Abstract

The invention relates to a combined PDC-thrust ball bearing long-life transmission shaft assembly. The combined PDC-thrust ball bearing long-life transmission shaft assembly comprises a transmission shaft, a lower TC movable sleeve, a lower TC static sleeve, a thrust ball bearing group, a PDC bearing group, an upper TC movable sleeve, an upper TC static sleeve and a transmission shaft shell, wherein the lower TC movable sleeve sleeves part of the shaft head of the transmission shaft; the lower part of the lower TC movable sleeve is connected with the transmission shaft; the lower TC static sleeve is mounted on the outer circumference of the lower TC movable cover in a matched manner; the lower TC static sleeve is connected with the lower end of the transmission shaft shell arranged at the outer circumference of the lower TC static sleeve; an anti-falling half ring, which is coaxial with the lower TC movable sleeve, is arranged at the upper end of the lower TC movable sleeve; the thrust ball bearing group and the PDC bearing group are sequentially mounted on the transmission shaft from top to bottom in a matched manner; the upper TC movable sleeve sleeves the upper part of the transmission shaft; the upper part of the upper TC movable sleeve is connected with that of the transmission shaft; the upper TC static sleeve is mounted on the outer circumference of the upper TC movable sleeve in a matched manner; a universal water-saving cap is also fixed at the upper end of the transmission shaft. The combined PDC-thrust ball bearing long-life transmission shaft assembly has the advantage that the overall service life of a screw drill can be effectively prolonged.

Description

technical field [0001] The invention relates to a screw drilling tool used in oil and gas drilling engineering and non-excavation pipeline construction engineering, in particular to a combined PDC-thrust ball bearing long-life transmission shaft assembly. Background technique [0002] In view of the important role of screw drilling tools in oil and gas drilling engineering and non-excavation pipeline construction engineering, its application is becoming more and more extensive, and various accidents caused by screw drilling tool failures occur frequently, and it takes a huge amount of time to deal with accidents Manpower, material resources and financial resources have seriously affected the drilling speed and drilling efficiency. The thrust bearing group is one of the weakest components in the screw drilling tool, and the research on its failure mode, mechanical properties, structural improvement and other aspects is of great significance and value to improve the service li...

AI Technical Summary

Problems solved by technology

The structural space of the thrust bearing group of the screw drilling tool is limited. If the diameter of the balls is too large, the number of balls in each row will be reduced, which will also reduce the bearing capacity of the entire bearing. At the same time, the structure of the inner and outer rings of the bearing will be too thin and easy to Cause premature fracture of the ring and reduce the service life of the bearing

[0004] The average service life of domestic screw drilling tools is between 120-150 hours, and the drive shaft thrust ball bearing group, as a vulnerable component, has become a bottleneck problem restricting the service life of screw drilling tools

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