Preferably, the large-flow plunger

Preferably, the large-flow plunger pump further comprises crankshaft support roller assemblies mounted on a periphery of a crank of a crankshaft of the crank-link mechanism; each of the crankshaft support roller assemblies comprises a roller and a fixed mount; a gap between each of the plurality of rollers and the crank is adjustable; and each of the plurality of rollers is arranged on the fixed mount and the fixed mount is fixed on the box.Preferably, on the top of the detachable upper crosshead guide, an upper cover plate is provided; and a pull rod assembly is provided between the detachable upper crosshead guide and the upper cover plate.Preferably, the damping ring has a reinforcing plate on its bottom.Preferably, the gap between the rollers and the crank can be adjusted by adjusting screws or other devices (for example, hydraulic devices).Preferably, the large-flow plunger pump further comprises a suction-pressure stabilizer which is, having a cooling water coil therein, provided at a suction inlet of the plunger pump.Preferably, a circulating cooling water inlet at one end of the cooling water coil is communicated with a water replenishing device via a pipeline while the other end of the cooling water coil is communicated with a cooling water inlet of a plunger pump oil pool cooling coil, the cooling water becomes high-temperature water after absorbing heat from the lubrication oil when flowing through the oil pool cooling coil, a high-temperature water outlet is communicated with a domestic heat supply pipeline, and the domestic heat supply pipeline is communicated with the water replenishing device (it can be a water replenishing tank).Compared with the prior art, the present invention has the following technical effects.In the present invention, on the basis of the conventional multi-cylinder plunger pumps, assemblies such as a detachable upper crosshead guide, an intelligent plunger packing lubrication system, a damping valve, crankshaft support roller assemblies, a pull rod assembly, and a suction-pressure stabilizer having a cooling water coil therein are invented. The service life of the large-flow plunger pumps is overall improved.The upper crosshead guide can be detached from the upper part of the chassis, which is convenient to maintain and replace the crosshead, the crosshead pins, the crosshead pin bushings, the links and other parts. The intelligent plunger packing lubrication system can discontinuously inject high-pressure lubrication oil to the friction pair between the plunger and the packing within a certain pressure range, in order to reduce the friction coefficient of the plunger packing and prolong the service life of the plunger packing. During the placement of the valve plate into the valve seat, due to the arrangement of the damping valve, the impact on the valve seat from the valve plate is effectively decreased, the noise produced by the pump is reduced, and the service life of the valve is prolonged. By providing a plurality of roller assemblies on the periphery of the crank of the crankshaft, the multi-cylinder multi-support of the crankshaft is fulfilled, and the reliability of the crankshaft is significantly improved. By the arrangement of the cooling water coil within the suction-pressure stabilizer, the circulating cooling water is cooled by the pumping medium. This is simple, energy-saving, and reliable. The continuous, reliable, high-efficient and energy-saving running of the large-flow plunger pump is ensured.