Research On Energy Saving Of Hydraulic System On Hoisting Mechanism Of Truck Crane

The energy consumption of hoisting mechanism takes a large proportion in the hydraulic system energy consumption of a crane. So the research of energy saving method for hydraulic system of hoisting mechanism has great significance to reduce the overall energy consumption of a truck crane. In this paper, a variety of energy saving methods were put forward for the hydraulic system of the hoisting mechanism in the automobile crane and the research and comparison were carried out.Firstly, the structure and principle of the hydraulic system of the 8 ton truck crane were analyzed, and the energy conversion process was also analyzed. The energy loss in the traditional hydraulic valve reduces the transmission efficiency of hydraulic system, especially the single spool valve throttle leads to unnecessary loss. Based on the above, the use of meter in and meter out independent regulation system and pump-control closed circuit system was proposed to reduce the energy loss of the valve in the hydraulic system. The former could independently adjust the inlet and outlet valve, reduce unnecessary throttling loss; in principle, the latter has no throttling loss and can significantly reduce the energy loss due to the throttling effect. Finally, energy recovery and reuse units were added on the two energy saving systems used to recover the potential energy and make it used again later, so as to achieve the purpose of reducing the energy consumption of hydraulic system.The model of the original hydraulic system was established in the software SimulationX. The energy consumption characteristics of the original hydraulic system were simulated according to the setting conditions, which provides a benchmark for the following analysis. Then the simulation model of the meter in and meter out independent regulation system and pump-control closed circuit energy saving system was established, then simulated with none energy recovery and energy recovery modes. Non energy recovery model was mainly used to verify the effect of the new system in reducing the energy loss of the valve. In this mode, the meter in and meter out independent regulation system greatly reduced the energy loss of the valve and the pump-control closed circuit system has no throttling loss. Compared with the original system the two energy-saving system could save energy 28.4%~51.1%. In the energy recovery mode, the energy recovery and reuse of the heavy objects can further reduce 7.6%~23.4% of the energy consumption of the two systems. However, there were two problems for the asymmetric load, so the key component parameters of the energy recovery unit were further optimized for the symmetrical load(working condition five), which is more meaningful. For the meter in and meter out independent regulation system, the pre-charge pressure of the accumulator was optimized, which increased energy efficiency by 25.6%. For the pump-control closed circuit system, better energy saving effect was achieved by increasing the displacement of pump motor and the pre charging pressure of accumulator and energy efficiency could be increased by 22.8% after optimization.