Power output time-share driving method for drilling machine

Abstract

The invention discloses a power output time-share driving method for a drilling machine. The power output time-share driving method for the drilling machine comprise the steps that a hydraulic motor transmits torque to a power output shaft through a power output device, and an inner drill pipe and an outer drill pipe are driven to rotate synchronously or the inner drill pipe is driven to rotate independently through the rotating torque output by the power output shaft under the action of a hydraulic gear shifting mechanism. Time-share driving of the inner drill pipe and the outer drill pipe can be achieved simply by additionally installing the hydraulic gear shifting mechanism at the front end of a power head, and thus a large amount of cost is saved for transformation of the drilling machine; in addition, the torque output by the inner drill pipe theoretically can be equal to the driving torque of the outer drill pipe, so that the construction efficiency is greatly improved; meanwhile, the structure is easy to operate and low in fault rate.

Description

technical field [0001] The invention specifically relates to a time-sharing driving method for power output of a drilling rig. Background technique [0002] At present, complex stratum structures are often encountered in directional crossing construction, such as hard rock, gravel, pebbles, sand and other mixed strata. Under such geological structure conditions, the most effective method for pilot hole crossing is to drive the rock with double-wall drill pipe. Drilling tools, the specific method is to install the roller cone bit on the drive shaft of the inner drill rod. During the construction process, when the inner and outer drill rods are rotated and pushed forward at the same time, the drilling trajectory is in a straight line; when the inner drill rod is rotated and the outer drill rod is not rotated but pushed forward, the drilling trajectory is bent in the direction of the steering elbow, so that it can follow the design Fixed trajectory drilling guide. But in orde...

AI Technical Summary

Problems solved by technology

[0003] To install a hydraulic motor at the rear of the power head of the drilling rig, the hydraulic system must first be changed, adding a set of oil pumps at the output end of the engine, changing the original double pump to a triple pump, adding a set of electromagnetic or hydraulic control reversing valve and some Hydraulic accessories; the second is to change the main shaft structure of the prime mover to drive the inner drill pipe 02 through the hollow main shaft 04. This solution needs to add a set of hydraulic motors, and corresponding hydraulic pumps, reversing valves, hollow shafts and other components, and the investment in equipment transformation is relatively high. Large, high cost, and inconvenient to operate. The most important reason is that the installation space of the inner drill pipe drive motor is limited, and it can only be driven by a single motor, which cannot transmit high torque. At the same time, it is difficult to achieve synchronization with the speed of the outer drill pipe drive motor.

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