Research On The Key Technology Of Crankshaft Plunger Pair Of Radial Plunger Swing Cylinder High Water-based Motor

Low-speed high-torque hydraulic motor is a kind of hydraulic actuator that has developed rapidly at home and abroad in recent years.It has the characteristics of compact structure,can directly drive the load,etc.,and is widely used in the fields of ships,construction machinery and mining machinery.In the application environment of metallurgy,mines,and coal mines,due to the flammability of mineral oil and serious leakage and pollution,there is an urgent need for low-speed high-torque motors with high water-based to replace low-speed mineral oil motors.Foreign countries are mainly engaged in the research of high-speed hydraulic motors,and products have come out;while domestically,only the axial plunger hydraulic motors have been studied,and the research on low-speed high-torque radial hydraulic motors is relatively rare.Therefore,the design and research of radial plunger swing cylinder type high water-based motors are of great significance to the development of low-speed high-torque motors and hydraulic actuators.First of all,based on the self-balancing valve distribution structure proposed by the subject,the plunger-crankshaft pair structure was redesigned on this basis,and a new plunger-crankshaft pair structure was proposed.The working principle and crankshaft column of the high water-based hydraulic motor were proposed.The kinematics of the plug pair is analyzed,and the main parameters of the motor displacement,torque and pressure pulsation under the new structure are calculated according to the motor structure parameters,and the working characteristics and output characteristics of the high water-based motor are simulated through the AMESim software to determine the The rationality of the design motor structure parameters.Then,according to the leakage problem of the high water-based motor,the key friction pair—the plunger-crankshaft pair and related structures are analyzed and simulated in theory.For the possible leakage between the plunger and the swing cylinder movement pair,a single-stage Gly ring seal structure is selected and ANSYS simulation software is used to explore the sealing form and mechanism under rated conditions.The results show that the single-stage Gly seal can meet the needs of use;Comparative analysis of the three design methods of the supporting cavity between the crankshaft plunger pair,adopting the residual compression structure design to meet the sealing characteristics requirements of the high water-based motor,and carrying out static simulation analysis on the different designed supporting cavity structures,and selecting suitable The size of the support cavity.Finally,based on the completed test bench,the plunger-crankshaft plunger pair under different operating parameters is tested and analyzed,and the leakage and wear conditions of the high water-based hydraulic motor under actual operating conditions are measured,and the crankshafts under different pressures and different speeds are obtained.The leakage laws and wear characteristics of the key friction pairs of the plunger;at the same time,different coating materials are used to explore the material matching of the crankshaft plunger pairs under actual operating conditions.Through research,it is found that the new structure of the crankshaft plunger pair fully meets the low-speed and high-torque operating conditions of high water-based motors,and the existence of the crankshaft bearing makes the sliding friction between the plunger and the crankshaft converted into the crankshaft and the bearing rollers.Rolling friction greatly reduces the wear failure between the crankshaft plunger pair and the crankshaft plunger pair under this structure has good sealing characteristics in the actual working process,which fully meets the volumetric efficiency requirements of high water-based motors.