Characteristics Of Pump Controlled Integrated Hydraulic Cylinder System For Excavating Boom

Traditional excavators use a valve-controlled hydraulic system to distribute flow,resulting in large throttling losses,frequent lifting and lowering of heavy-duty working devices,and serious waste of gravitational potential energy,resulting in high energy consumption and low energy efficiency of the whole machine.Aiming at the problem of large throttling loss of hydraulic valves,there are mainly two existing solutions.One is to use a new valve-controlled hydraulic system to reduce the excess flow and throttling links in the system,but the essence of throttling control has not changed.Hydraulic valve throttling is still inevitable.In contrast,the use of pump control technology can completely eliminate hydraulic valve throttling,which has obvious advantages.Current research mainly focuses on adding pump sources or various auxiliary components to balance the flow difference of single rod hydraulic cylinders.Methodologically,the asymmetric flow has not been eliminated from the source.Aiming at the problem of large-capacity gravitational potential energy waste in working devices,energy recovery through mechanical,electrical or hydraulic technology can achieve better energysaving effects,but there is still room for improvement in the recovery rate of gravitational potential energy.Based on this,this article,with the funding of the National Natural Science Foundation of China(51775363,U1910211),proposes a pump-controlled integrated hydraulic cylinder system for large hydraulic excavating booms,which uses a special structure of integrated hydraulic cylinder as the actuator to cooperate The energy storage accumulator basically eliminates the asymmetric flow in the closed oil circuit from the source,the throttle loss of the hydraulic valve is greatly reduced,and the gravity potential energy of the boom is quickly recovered and reused.The specific research content is as follows:This article first analyzes the working principle of the proposed system.On this basis,mathematical modeling is carried out on the mechanical structure of the working device and the key components of the hydraulic system,and combined with actual work needs,the parameters of the main components are matched to complete The overall design of the system.Then the operating characteristics of the proposed system were analyzed theoretically,corresponding control strategies were formulated,a multidisciplinary co-simulation model of the proposed system was built in Simulation X software,and the accuracy of the model was verified by experiments.On this basis,The influence of control strategy and key components on the system’s operating characteristics is simulated.Finally,a test platform was built on a small hydraulic excavator,and the proposed system was compared with other systems,which provided reference and reference for the application of the pump-controlled integrated hydraulic cylinder system on a large hydraulic excavator.The research results show that after the proposed pump-controlled integrated hydraulic cylinder system is adopted,the hydraulic excavating boom runs smoothly,the gravity potential energy of the boom is efficiently recovered,the throttle loss of the hydraulic valve is almost completely eliminated,the output energy of the hydraulic pump is significantly reduced,and the energy saving effect is better.Well,it verifies the feasibility of using the proposed system to control the energy saving of the excavating boom.