The pump casing and pump cover are welded by steel plates. The bearing seat of the transmission shaft and the crankshaft is an integral steel casting, which is welded with the pump casing after processing, and annealed after welding to eliminate residual stress. The dimensions of the overhanging parts at both ends of the drive shaft of mud pump parts are completely symmetrical, and large pulleys or sprockets can be installed at both ends. The supporting bearings at both ends adopt single row radial short cylindrical roller bearings.
The crankshaft adopts a forged straight shaft eccentric wheel structure, which replaces the traditional integral cast crankshaft structure of the three-cylinder pump. The casting is changed to a forging, and the whole is changed to an assembly. It is easy to use, easy to manufacture, and easy to maintain. The eccentric wheel, herringbone gear hub and shaft adopt interference fit. The small end of the connecting rod of the mud pump parts is equipped with a pin shaft, and the two ends of the pin shaft are equipped with single-row radial short cylindrical roller bearings, which are assembled on the crosshead. The body of the crosshead is made of ductile iron, and the guide plate is made of ductile iron. The crosshead and the middle rod are connected by flanges and bolts.
(1) Mud pump accessories valve box
The integral forging is a vertical structure, and it is a series of drilling pumps with the smallest clearance volume among high-power mud pumps. The mud pump spare parts valve box is discharged and sucked through the discharge manifold and the suction manifold, one end of the exhaust manifold is equipped with a high-pressure four-way and exhaust pre-compression air bag, and the other end is equipped with a lever type (single-pin multi-point) shear safety valve. The discharged pre-compressed air bag is an integral casting, its body, capsule and sealing ring, and the inflation pressure of the pre-compressed air bag capsule is 20%-30% of the working pressure.
(2) Cylinder liner for mud pump parts
The bimetal cylinder liner is adopted, and the inner layer is made of high-chromium wear-resistant alloy, and the inner surface roughness is required to be within 0.20. Piston is composed of piston core, pressure ring and collar, which meets the ministerial standard. The middle mark is connected with the piston rod through a clamp, which is convenient for disassembly and assembly, and adopts an adjustable middle rod packing box structure.
(3) Sprinkler system
According to user requirements, a special electric centrifugal pump or a centrifugal pump driven by a drive shaft is used as a spray pump, and the cylinder liner is cooled and lubricated through the nozzles on the spray box. Generally, water or water-based solution (soluble emulsified oil or diesel oil can be added) is used as the cooling liquid, which flows into the water tank for recycling.
(4) Mud pump accessories exhaust manifold assembly
The overall forged assembly and welding structure are adopted, the discharge manifold of the mud pump parts and the front planes of the three valve boxes are connected by bolts and sealed with O-shaped packing, and the discharge valve chambers do not communicate with each other.