New Type Of Load To Keep The Valve Performance And Simulation Analysis

Hydraulic balancing curcuit, which is a basic control loop in Hydraulic PowerTransmission, is widely used in the occasion of the vertical movement of the working partsbecause of it's specific characteristics of load support, holding and lowering speed control.And counterbalance valve is the key component to perform the founction of the curcuit. Flowof fluid under pressure is needed to supplied to the cylinder to lower the load in traditionalcounterbalance valve. There are some disadvantages in traditional counterbalance valve suchas the high pilot pressure, the large power loss and difficult in speed control. If the operatedpressure kept constant, the load would lower too fast in working condition of load increasinggradually. Consequently, in order to improve the performance of the curcuit and take the placeof traditional counterbalance valve, the New Load Control and Holding valve is researched indetail in this paper.For all of these cases, theoretical calculations and the simulation of dynamic behavior forthe New Load Control and Holding Valve are completed in this paper. The comparisonbetween the performance of the New Load Control and Holding Valve and the currentsolution with Screw-in Cartridge Counterbalance Valve which is widely used will be done soas to prove the better characteristics of the new solution in control and energy consumption.The the main research subjects are as follows:(1) Based on the typical hydraulic pilot-operated balancing circuit, the load loweringconditons of the circuit and it's theoretical calculation formula are represented in detail. Thearticle analyzes the energy lost in various kinds of working conditons, especially in loadlowering conditon. And the analysis result indicates that the energy consumption of thesystem, which is a great deal, comprises gravitational potential energy of the load and thecontrol energy for lowering the load. According to the result, an energy saving idea is raised.(2) Take Screw-in Cartridge Counterbalance Valve, which is widely used for currentsolution of the load control and holding, as an instance, this article established themathematical models and AMESim simulation models. This chapter focuses on analysis ofthe relationship between the dynamic characteristics of the system and cone angle of the spool,spool spring stiffness, diameter of inlet orifice and the load. The results lay the foundation forcomparison between the New Load Control and Holding Valve and current solution in aspect of lowering control characteristic and energy-saving characteristic.(3) Working principles and characteristics of the New Load Controland Holding Valve aredescribed in detail. The resistance network of pilot operated throttle valve which is the keycomponent of the system has been analyzed, it's schematic structure and mathematical modelhave also been established. In this paper, the structure of pilot operated throttle valve isdetailed and especially its key parts are computed in the manner of general steps to designhydraulic compunents.(4) The AMESim simulation model of the New Load Controland Holding Valve has beenestablished and the Feasibility of the function of the New Load Control and Holding Valvehas been confirmed by means of simulation. The lowering speed of load is controled byproportional pressure reducing valve. The function of lowering by effect of the force ofgravity can lessen the energy consumption tremendously. The pressure compensation functioncan improve the stability of the system in working condition of load increasing gradually.(5) The analysis of the energy consumption of the two solutions above is completed in thesame conditons. The comparison for energy consumption characteristics between the new andthe old solutions in different conditions is done and the detailed analytical data is shown inpaper. The research results of the article show that the New Load Control and Holding Valvehas significant energy-saving effect.