Coring drill mud pump control method for railway engineering exploration

Abstract

The invention relates to the technical field of slurry pump control, and discloses a coring drill slurry pump control method for railway engineering exploration. The method comprises the following steps: 1) connecting a mud pump with a hydraulic motor, and starting the hydraulic motor to drive the mud pump to rotate; (2) in the drilling process of the drill rod, detecting the mud pressure in a drill hole through a pressure detector, and transmitting the detected mud pressure value P to a console on the ground; (3) after the console receives the mud pressure value P, adjusting the opening degree of a throttle valve to control the flow of a hydraulic motor in an intervention mode that human intervention is matched with computer control system intervention, so the rotating speed of the mud pump is controlled, and then the flow of mud in a drill hole is adjusted. According to the invention, the hydraulic motor is directly connected with the slurry pump, stepless speed regulation of the mudpump is achieved, the opening degree of the throttle valve is adjusted in an adjusting mode of combining human intervention and computer system intervention, the rotating speed of the mud pump is controlled, then the mud flow is controlled, the process is simple, and the control is accurate.

Description

technical field [0001] The invention belongs to the technical field of mud pump control, in particular to a method for controlling a mud pump of a core drilling rig used for railway engineering exploration. Background technique [0002] During the drilling process, the mud has the following functions: 1. Cooling the drill bit; 2. Lubricating the drill bit; 3. Flushing the sand from the drill bit at the bottom of the hole out of the hole; 4. Lubricating the drill pipe to reduce friction; 5. Maintaining a certain The water pressure prevents the hole wall from collapsing. [0003] Flow rate is a key variable in optimizing drilling efficiency. Fluid must effectively cool the drill bit, remove cuttings from the cutting face of the bit, and carry these cuttings up the pore to the surface. The flow rate should increase with the increase of the drilling rate, and the flow rate and load capacity depend on the viscosity of the flow liquid. Generally speaking, the cuttings should alwa...

AI Technical Summary

Problems solved by technology

If the flow rate is too much, the pressure will increase, which will affect the actual drill bit pressure and the corresponding cutting performance, if the flow rate is too small, the drill cuttings cannot be removed, and the drill bit will wear out prematurely

[0004] The existing mud pump is driven by a diesel engine, and there is a shift mechanism in the middle, with only 4 gears, which cannot achieve stepless speed regulation, and cannot accurately adjust the flow of mud