Research On Energy Saving Of Excavator With Double-bladder Accumulator

With the rapid development of the times,people are pursuing high standards and high efficiency in various fields.In recent years,the field of infrastructure construction has developed rapidly,benefiting from the rapid development of the construction machinery industry,followed by a huge waste of energy.In order to improve the utilization rate of energy,people have carried out a lot of energy-saving research.In the field of construction machinery,because of the nature of work and other reasons,the operating mechanism often has a large mass and moment of inertia,which needs hydraulic drive,and these large gravitational potential energy and kinetic energy are usually consumed in the hydraulic valve.Therefore,improving the energy utilization rate and recycling the excess energy in the system is the main direction of energy saving research.This paper is based on the asymmetric pump-controlled hydraulic cylinder technology proposed by the research group.Aiming at the insufficient charging and discharging characteristics of traditional accumulators,through innovative thinking,a double-bladder accumulator system is proposed and applied to the hydraulic system of excavators.For the purpose of energy recovery and reuse on hydraulic excavators to save energy consumption,the charging and discharging characteristics of the double-bladder accumulator and the energy recovery and reuse rate are studied.Firstly,the principle of asymmetric pump transformation and the design principle of double-bladder accumulator are introduced in detail,and the working hydraulic system circuit of excavator is designed.Perform analysis and establish mathematical models.Secondly,according to the working principle of the double-bladder accumulator and the asymmetric pump,a simulation model was built in the multi-disciplinary simulation platform software AMESim,and its correctness was verified.Finally,by calculating the position parameters of the working device of the excavator and building its simulation model,under the same simulation working conditions,the ordinary bladder accumulator and the double-bladder accumulator system are respectively connected to the simulation model and simulated,and two are obtained.Compared with the charging and discharging characteristics and energy reutilization rate,the double-bladder accumulator can be adjusted to achieve stable oil discharge pressure at the oil outlet.Its power is higher than that of ordinary accumulators.The energy discharging characteristics are better than that of ordinary accumulators.The double-bladder accumulator system increases the energy recovery and reuse rate by 15.23% compared with ordinary accumulators in one cycle of excavator working devices.Finally,by setting the different volumes and pre-charge pressures of the accumulators,respectively,simulations were carried out,and the energy recovery and reuse rate and engine power consumption were compared,and it was concluded that the double-bladder accumulator had a higher energy recovery and reuse rate in the excavator working device.The energy-saving matching parameters are 12 L,the pre-charge pressure is 2.0 MPa,and the energy reutilization rate is 73.28%.