Views:0 Author:Site Editor Publish Time: 2017-10-10 Origin:Site
From the structural point of view, NQ drill mainly by the double-tube assembly and the two parts of the salvage, where the double tube refers to the outer tube assembly and the inner tube assembly, the outer tube assembly includes a bomb Baffle, card chamber, seat ring, up and down reaming, outer tube and drill bits and other components, while the inner tube assembly is by fishing spearhead, positioning mechanism, adjusting mechanism, suspension mechanism, Constitute.
When the inner tube assembly of the NQ drill is lowered along the inner wall of the drill string, the spring-loaded caliper on the positioning mechanism always opens outwardly to some extent. When the spring-loaded card chamber is reached, the spring-loaded card continues to expand outward to attach the two wings Card room on the wall. Due to the larger inner diameter of the elastic chamber of the inner tube assembly and the smaller inner diameter of the elastic stopper of the upper end and the protruding shift fork, the inner tube can be prevented from moving upward during the drilling process. The upper part of the inner tube assembly bearing can be rotated together with the drill pipe.
The outer diameter of the suspension ring in the NQ drill suspension is slightly larger than the inner diameter of the seat ring so that the suspension ring is seated on the seat ring when the inner tube assembly is lowered into the outer tube assembly and the seat ring so that the inner tube assembly The lower end of the spring retainer and drill bit to maintain proper clearance between the steps to ensure that the inner tube of single action.
NQ drill single-action mechanism is composed of two thrust bearings, its main role is to make the inner tube does not rotate during drilling, to maintain a stable state. The adjustment mechanism can be used to adjust the distance between the connector and the spring sleeve to ensure the clearance between the retainer seat and the step in the drill bit.
In general, the NQ drill has a different drilling specification from that of a normal drill, which is related to its thicker lip and the NQ drill has a smaller clearance between the drill pipe and the hole wall. Therefore, When drilling pressure increase correspondingly, and the flow of irrigation fluid should be reduced.