Kinematics Characteristics Research And Design Of The Power Side Of The Constant Flow Four-cylinder Radial Piston Pump

The piston pump is an important component of the hydraulic system,widely used for engineering machinery,mining machinery,equipment and aerospace and other major areas.With the continuous development of industrial technology,the industry put forward higher requirements on the performance of piston pump.Based on the constant flow output technology of the piston pump,the power end mechanism of constant flow four cylinder reciprocating radial piston pump which is based on mechanical structure is designed.The simulation and experimental results show that the motion characteristics can meet the requirements.The following is the specific work:According to the basic steps of mechanism creative design,based on the previous analysis of implementation technology of constant flow output,the target action of the executive member of the piston pump power side mechanism is determined.Based on the selection and configuration of the mechanism,the morphological matrix of the dynamic end mechanism scheme of the constant flow piston pump is constructed,and the four forms of the power side mechanism are drawn from the matrix.By using the AHP method,variable sine mechanism cam Geneva combined mechanism is chosen as the principle mechanism of the power side of piston pump.Based on the above principle of mechanism,formulas of core parameters are designed.The speed characteristics of the piston during the start and stop process are optimized.The reliability of the continuous movement of the Geneva Mechanism in the variable transmission ratio mechanism is improved.A simplified model is established.The correctness of the theoretical derivation is proved by using simulation software.The new piston pump power end scheme realizes the pump output flow no pulsation.Caused by the close of the valve hysteresis flow and volume efficiency loss are eliminated.The experimental device of the small diameter piston pump power end is designed,and the two-dimensional graph of the experimental device is drawn.The finished parts are assembled into a complete prototype of the experimental device to make it run smoothly.The appropriate encoders are Selected.Based on the GXworks2,MITSUBISHI FX2 N PLC ladder diagram is prepared.Dial plate,groove wheel and piston movement rules are collected.The collected data and the theoretical values were compared.The measurement results show that rotational speed and the theoretical value of Geneva error is small.The linear velocity and the theoretical error is small The trend of the movement of the two is approximately the same.consistent with that from The experimental results show that the principle of uniform linear motion can be achieved.Finally the future research works are expected: The problem of collision caused by the difference of the direction of the steering wheel and the direction of the central line of the groove wheel.The problem of sensitivity of all parts of the key size error on piston movement speed.The problem of eliminating the sharp angle in the angular velocity curve.etc.