Drilling process, the drilling hole to send mud or water and other washing liquid machinery. Mud pumps are an important part of drilling equipment. In commonly used positive circulation drilling, it is the surface flushing medium ─ ─ water, mud or polymer flushing fluid under certain pressure, through the center of the high-pressure hose ﹑ taps and drill pipe straight hole to the bottom of the drill to achieve Cool the drill bit, remove cuttings and deliver them to the surface. Commonly used mud pump is piston or plunger, driven by the power machine crankshaft rotation of the crankshaft through the crosshead and then drive the piston or plunger to reciprocate in the pump cylinder. In the suction and discharge valve under the action of alternating pressure to achieve the purpose of circulating fluid and washing. Mud pump single and double role in two types, single-acting reciprocating piston in a cycle only to complete a suction and drainage action. The double-acting reciprocal completion of the suction and drainage action twice. If the pump according to the number of cylinders, there are three types of single cylinder, double cylinder and three cylinders. The two main parameters for mud pump performance are displacement and pressure. Displacement in a few liters per minute discharge calculation, which is related to the diameter of the borehole and the required rate of flushing fluid from the bottom of the hole on the speed, that is, the larger the aperture, the greater the displacement required. Requires the rinse fluid on the back speed of the bit can cut the drill cuttings ﹑ rock punching timely from the bottom of the hole, and reliably carry to the surface. Geological core drilling, the general return speed of 0.4 to 1.0 m / min or so. The pressure of the pump depends on the depth of the borehole, the resistance of the passage through which the flushing fluid passes, and the nature of the flushing fluid delivered. The deeper the borehole, the greater the resistance of the pipe and the higher the pressure required. With the drilling diameter, depth changes, requiring the pump displacement can be adjusted at any time. In the pump mechanism with gearbox or hydraulic motor to adjust its speed, in order to achieve the purpose of changing the displacement. In order to accurately grasp the pump pressure and displacement changes, the mud pump to be installed on the flow meter and pressure gauge, at any time so that drilling personnel to understand the pump movement, while pressure changes to determine the status of the hole is normal to prevent the occurrence of holes ACCIDENT.