Controllable low-velocity and large-toque power head motor

Abstract

The invention relates to a controllable low-velocity and large-toque power head motor, relating to a power head motor for a rotary drilling rig, and aiming at providing a controllable low-velocity and large-toque power head motor which is simple in structure and simple and convenient in operation. The controllable low-velocity and large-toque power head motor provided by the invention comprises an independent variable motor and a control mechanism, wherein a plunger type motor and a variable regulating piston are arranged in the independent variable motor; an X port and a G port are formed onthe independent variable motor; the X port is communicated with the oil drainage port of the plunger type motor; the G port is communicated with the working oil ports A1 and B1 of the plunger type motor through a shuttle valve; the control mechanism comprises at least two switching oil circuits, wherein one oil circuit ensures that a rod-free cavity of the variable regulating piston is directly communicated with the working oil ports A1 and B1 of the plunger type motor through the shuttle valve; and the other oil circuit ensures that the rod-free cavity of the variable regulating piston is directly communicated with the working oil port A2 of a hydraulic control two-position three-way valve.

Description

technical field [0001] The invention relates to a power motor, in particular to a controllable low-speed high-torque power head motor for a rotary drilling machine. Background technique [0002] The power head is one of the most important working parts of the rotary drilling rig, which consists of a power head motor, a reducer, a power box, etc. The engine rotates to drive the main pump to output hydraulic energy, which is transmitted to the motor of the power head through the reversing valve. The motor absorbing the hydraulic energy runs at high speed and is decelerated by the reducer and gearbox, and finally transmits the power to the drill pipe, thereby realizing the rotary drilling rig. Drill mode. [0003] Such as figure 1 As shown, the ordinary power head motor is an independent variable motor, including a plunger motor 2', a variable adjustment piston 3' and a hydraulically controlled two-position three-way valve 5', the rod chamber of the variable adjustment piston...

AI Technical Summary

Problems solved by technology

At this time, ordinary power head motors cannot meet this new requirement.

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