| With the continuous growth of China’s economic level,the demand and investment in infrastructure in China has increased greatly.With the construction of silk Road Economic Belt,hydraulic excavators are in short supply.Large,especially super large hydraulic excavator has the advantages of excellent mobility,strong environmental adaptability,wide range of excavation and loading,high production efficiency.They are widely used in large infrastructure and mining,and are the main technical equipment in China.At present,the super large excavator market is mainly monopolized by foreign companies.In recent years,domestic Taichung,XCMG,Sany and other companies have developed related products,which serioussly restricts the autonomy of large-scale engineering construction in China.In order to meet work needs,super-large hydraulic excavators widely use high-strength and heavy-duty mechanical arms as working devices.In the reciprocating work cycle,the power energy of the heavy-duty robotic arm is often lost due to throttling,even exceeding 20% of the engine output energy.This is a serious waste and restricts the efficient,low-carbon,and green operation of ultra-large equipment problem.In view of the above problems,the research team innovatively proposed a method of efficient recovery and reuse of potential energy of large mining hydraulic boom driven by a new three chamber hydraulic cylinder.In this system,the piston rod of the traditional hydrauliccylinder is emptied into an independent cavity innovatively,and a piston is added to match it to form a piston pair,which is connected with the hydraulic accumulator and works in the reciprocating lifting process.The gravitational potential energy of the device is transformed into hydraulic energy by the newly added piston pair,and stored in or released by the hydraulic accumulator,so as to realize the efficient recovery and reuse of the gravitational potential energy of the working device.The specific research object of this paper is 260 t large hydraulic excavator.The main research contents and results are as follows1.The working principle of the original two-chamber hydraulic cylinder system and the proposed three-chamber hydraulic cylinder system is analyzed.According to the working requirements of the three-chamber hydraulic cylinder and accumulator,the design and parameter selection are carried out,and the main pump and the main pump are established in Simulation X.Put forward by three cavity hydraulic cylinder,valve,accumulator and other parts of the hydraulic system simulation model of energy recovery and will in the Pro/E software to build a large 3D model of hydraulic excavator working device import Simulation X,combined with the hydraulic system model,simulation model of hydraulic excavator multidisciplinary joint,double cavity hydraulic cylinder system are analyzed and three cavity working characteristics of hydraulic cylinder system and energy-saving features.2.According to the established model,the working characteristics and energy efficiency characteristics of the boom system driven by two chamber hydraulic cylinder and three chamber hydraulic cylinder are simulated and analyzed.The simulation results show that under the noload condition and the same condition,the three chamber hydraulic cylinder system makes the boom run more stable,and can reduce the energy consumption of the main pump by about85.11%;under the full load condition of the bucket,the three chamber hydraulic cylinder driving boom system can reduce the energy consumption of the main pump by about 62.22%.3.The descending process of the two chamber hydraulic cylinder drive rod system and the three chamber hydraulic cylinder drive rod system is simulated and analyzed when the bucket is fully loaded.It can be seen from the simulation that when the proportional flow valve is regenerated,it will affect the stroke of the original boom hydraulic cylinder,and the displacement is the same as that of the extended arm hydraulic cylinder.Under the same simulation conditions,the three chamber hydraulic cylinder system has better energy saving effect.4.A further experimental study is carried out on a large mine hydraulic excavator.The accuracy of the simulation model is verified by comparing the experimental data and the simulation data respectively. |
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