Method and system for controlling power head of rotary drilling rig and rotary drilling rig

Abstract

The invention provides a method and system for controlling a power head of a rotary drilling rig and the rotary drilling rig. The method comprises the following steps that the main pump pressure of the power head of the rotary drilling rig is obtained in real time in the continuous increase process of the load pressure of the power head of the rotary drilling rig; if it is judged that the main pump pressure is equal to the main pump variable point pressure, the motor displacement of the power head of the rotary drilling rig is controlled to be gradually increased from the preset motor displacement until the main pump pressure is equal to the main pump variable point pressure again, and therefore control over the power head of the rotary drilling rig is achieved. According to the method and system, the displacement of the motor of the power head of the rotary drilling rig is actively adjusted, so that the motor cannot be changed in advance, the efficient area of the main pump is enlarged, the main pump can output at the maximum flow, the speed of the power head is increased, and the construction efficiency of the rotary drilling rig is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a method and system for controlling a power head of a rotary drilling rig and the rotary drilling rig. Background technique [0002] As an important operating machine in construction engineering, rotary drilling rigs are currently widely used in foundation drilling and filling projects such as bridges and municipal construction. [0003] At present, in the control method of the power head of the rotary drilling rig, when the load pressure changes within a certain range, the displacement of the motor of the power head of the rotary drilling rig changes linearly to adapt to the load pressure. This will cause the displacement of the motor to change prematurely, resulting in a rapid decrease in the speed of the power head of the rotary drilling rig in the low-pressure area, which is not conducive to the improvement of construction efficiency in low-load conditions such as soil dr...

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Problems solved by technology

[0004] The invention provides a method and system for controlling the power head of a rotary drilling rig and a rotary drilling rig, which are used to solve the problem that the displacement of the motor in the prior art changes prematurely, which causes the speed of the power head of the rotary drilling rig to decrease rapidly in the low-pressure area, which is not conducive to The defect of improving construction efficiency in low-load conditions such as drilling soil, realizes the function of adjusting the displacement of the motor to adapt to the change of load pressure, and improving the construction efficiency of the power head of the rotary drilling rig

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