return speed of drilling fluid from the bottom of the hole, i.e. the larger the diameter of drilling hole, the larger the desired displacement. The return speed of drilling fluid should wash away the debris and rock powder cut by the drill from the bottom of the hole in a timely manner, and reliably carry them to the earth's surface. When drilling geological core, the speed is generally in range of 0.4 to 1.0 m^3/min. Pressure The pressure of the pump depends on the depth of the drilling hole, the resistance of flushing fluid (drilling fluid) through the channel, as well as the nature of the conveying drilling fluid. The deeper the drilling hole and the greater the pipeline resistance, the higher the pressure needed. With the changes of drilling hole diameter and depth, the displacement of the pump can be adjusted accordingly. In the mud pump mechanism, the gearbox or hydraulic motor is equipped to adjust its speed and displacement. In order to accurately measure the changes in pressure and displacement, a flow meter and pressure gauge are installed in the mud pump. Characteristics The structure is simple and easy to disassemble and maintain Smooth operation, low vibration and low noise Can deliver high concentration and high viscosity (less than 10000 PaS) suspended slurry Drilling fluid flow is stable, no overcurrent, pulsation and stirred, shear slurry phenomena Discharge pressure is not connected to speed; low flow can also maintain a high discharge pressure Displacement is proportional to the speed, and can be adjusted by shifting the mechanism or motor High self-absorption ability, and can suck liquid directly without bottom valve Maintenance The construction department should have a special maintenance worker that is responsible for the maintenance and repair of the machine. Mud pumps and other mechanical equipment should be inspected and maintained on a scheduled and timely basis to find and address problems ahead of time, in order to avoid unscheduled shutdown. The worker should attend to the size of the sediment particles; if large particles are found, the mud pump parts should be checked frequently for wear, to see if they need to be repaired or replaced. The wearing parts for mud pumps include pump casing, bearings, impeller, piston, liner, etc. Advanced anti-wear measures should be adopted to increase the service life of the wearing parts, which can reduce the investment cost of the project, and improve production