Drill rod retaining mechanism

Abstract

The invention discloses a drill rod retaining mechanism, which comprises a rotating sleeve, wherein multiple slip pieces are matched in taper to form a structure with an adjustable clamping diameter in the sleeve; transverse pins are fixedly connected to the outer walls of the slip pieces in a screwing manner; one end of each transverse pin penetrates through a sleeve wall of the sleeve and has an exposed section exposed from the sleeve wall; an elastic element is arranged between the sleeve and the slip pieces, and is used for driving the slip pieces to move towards a clamping diameter reduction direction; an axial sliding chute in sliding fit with the transverse pins is formed in the sleeve wall of the sleeve; a nut is also screwed to the sleeve, and is used for driving the slip pieces to move towards a clamping diameter increasing direction through the transverse pins; preferably, the nut is connected with a sliding sleeve through multiple salient points; the multiple transverse pins are connected to the same sliding sleeve through the exposed sections, and the exposed sections form sliding fit connection with matching holes in the sliding sleeve. The drill rod retaining mechanism has the beneficial effect that the condition that a drill rod slides down and moves backwards to hurt a person or potential safety hazards of equipment can be effectively avoided.

Description

technical field [0001] The invention relates to a drill rod stop-retreat mechanism, in particular to a drill rod stop-retreat mechanism for underground drilling in coal mines. Background technique [0002] In the underground operation of coal mines, it is an indispensable job to use an underground drilling rig to drill holes. The drill pipe of the downhole drilling rig is driven to rotate by the power head. With the increase of the drilling depth, the length of the drill pipe needs to be increased by increasing the drill pipe. Therefore, the front end of the power head of the drilling rig is usually equipped with a front gripper. When adding drill pipes, the front drill pipes are clamped and fixed, which is convenient for screwing connection with the drill pipes to be added. Most of the downhole drilling rigs work by drilling obliquely or vertically upwards. When adding drill pipes, if the front clamp is not clamped or not clamped firmly, the front drill pipe is easy to sli...

AI Technical Summary

Problems solved by technology

Most of the downhole drilling rigs work by drilling obliquely or vertically upwards. When adding drill pipes, if the front clamp is not clamped or not clamped firmly, the front drill pipe is easy to slide back under the action of gravity and hurt the safety of people. Hidden danger

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