Research On Energy Saving Methods Of Hydraulic Rotary System For Tower Crane

Nowadays,hydraulic tower crane is widely used because of its high lifting height,large working range and high load bearing capacity with the rapid development of global economy and the spring-up of high-rise buildings and ultra high-rise buildings.Meanwhile,with diesel engine as the main source of power,the environmental pollution and harm to human health caused by the wide use of the hydraulic tower crane cannot be neglected.The green economy with the theme of energy-saving and consumption-decreasing has become the main theme of social development,so the research on energy-saving and consumption-decreasing of hydraulic tower crane has become more and more necessary and urgent.In the braking process of hydraulic tower crane,the original kinetic energy of the platform is distributed to the system in the form of thermal energy,which not only causes the waste of energy,but also influences the performance of the system.Focusing on this phenomenon,the thesis brought up a hydraulic energy-saving rotary system with the certain type of hydraulic tower crane as research object.The hydraulic energy-saving rotary system used a load sensing pump which can sense the flow and pressure demand of load.Furthermore,an accumulator is used so that the energy of the rotary platform during braking can be recycled.And the recycled energy can be reused in the cooling system to achieve the purpose of energy saving.In the AMESim software,the model of the hydraulic energy-saving rotary system of the tower crane was established correctly,and the working characteristics of the system were analyzed by the simulation.The results showed that the braking process of the hydraulic energy-saving rotary system was more stable.What’s more,the braking energy recovery rate could reach 38.92%,and the energy reuse rate could reach 87.57%.The influence of different ractors on the system was further simulated,and the hydraulic energy-saving rotary system was improved.The improved system used two 16L accumulators whose minimum work pressure was set as 60bar to work in parallel.The simulation results showed that the energy recovery rate can be increased to 40.38%and the energy reuse rate can be increased to 96.25%.Compared with the original system,the improved system can save 18.76%energy.This study provides a theoretical basis for the energy saving design of the hydraulic tower crane,and has certain theoretical value and practical significance for the research and development of engineering machinery.