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This complete transmission assembly consists of the crankshaft, gear shaft, and integrated gears, serving as the critical power-end core of high-pressure plunger pumps. Operating under extreme alternating loads, the assembly converts the rotary motion from the motor or diesel engine into the reciprocating linear motion of the plungers, delivering stable high-pressure power.
Manufactured from high-quality 45# carbon steel (with full customization options available), the assembly is precisely forged or cast and heavily reinforced to withstand high impact, high loads, and harsh underground environments. It is specifically engineered for five-cylinder high-pressure plunger pumps, providing robust and reliable power for longwall mining hydraulic systems.
This high-pressure pump assembly (working pressure typically >35 MPa) is highly reliable, impact-resistant, and contamination-resistant, making it ideal for severe working conditions. Key application industries include:
Steel & Metallurgy Industry (Core Application): Hydromechanical descaling for hot/cold rolling production lines, high-pressure water descaling of steel billets, and continuous high-pressure water supply systems for rolling and continuous casting lines.
Oil, Gas & Energy Extraction: Shale oil and coalbed methane hydraulic fracturing, downhole high-pressure hydraulic drive, drilling high-pressure cleaning, multiphase media transportation, and high-pressure boosting for new energy media (hydrogen/ammonia).
Mining & Coal Industry: High-pressure hydraulic systems for coal mine longwall faces, high-pressure water jet rock breaking, sludge cleaning, and explosion-proof high-pressure cleaning of downhole equipment.
Industrial High-Pressure Water Jet: Ship rust removal, airport runway marking removal, concrete hydraulic crushing, chemical equipment cleaning, water cutting, pipeline descaling, and high-pressure paint removal for oil pipelines and storage tanks.
Chemical, Power & Non-Ferrous Metals: High-pressure quantitative transportation of corrosive/high-viscosity media, power plant boiler and pipeline high-pressure cleaning, and descaling processes for aluminum/copper non-ferrous metal rolling.
Material Category | Typical Grades | Key Characteristics | Typical Applications |
|---|---|---|---|
Carbon Steel (Standard) | 45# | Good comprehensive mechanical properties | Standard crankshafts and gears |
High-Strength Alloy Steel | 40CrNiMoA, 20CrNiMo, 42CrMo | High strength, excellent toughness, good hardenability | Heavy-duty, high-impact pump components |
Special Alloys | Custom Alloy Steels | Extreme strength and fatigue resistance | Special high-pressure working conditions |
Forging & Heat Treatment: High-strength alloy steel or carbon steel billets are forged and subjected to normalizing and quenching & tempering to ensure internal structural integrity and high fatigue resistance.
Rough Machining: CNC turning and milling remove excess material, establishing the preliminary geometry of the crankshaft journals and gear shaft.
Gear Cutting: Precision hobbing or shaping is performed to form the helical or herringbone gear teeth on the shaft ends.
Precision Grinding: High-precision grinding of the crankshaft journals and gear teeth ensures smooth meshing, reduces noise, and extends service life.
Fillet Rolling: High-hardness rollers apply pressure to the crankshaft transition fillets, creating a cold-work hardened layer and residual compressive stress to significantly improve bending fatigue limits.
Strict dimensional and geometric tolerance checks for journals and gear parameters.
Surface roughness inspection to ensure Ra 0.8–0.1 μm on treated surfaces.
Hardness testing to verify surface hardening (HRC 30 to HRC 55 after rolling).
Ultrasonic Testing (UT) and Magnetic Particle Inspection (MT) to detect internal or surface defects.
Gear meshing and noise tests for the complete assembly.
All components are coated with heavy-duty anti-rust oil and wrapped in shock-absorbing protective materials. The matched assembly is securely packed in export-standard reinforced wooden cases. Custom labeling and packaging are available upon request.
