Research On The Braking Energy Recovery System Of Pile Driver Crane

:For the advantages of high efficiency, no pollution and no noise, hydraulic static pile driver has been widely used in prefabricated pile construction. The crane is an important device of the hydraulic static pile driver. With large rotary inertia, the crane will release a lot of energy in the braking, which not only wastes energy, but also affects the performance of the hydraulic system because most of the braking kinetic energy is converted into heat by the friction and overflow. However, at home and abroad this issue has never been studied, therefore, study on the slewing brake energy recovery system of the hydraulic static pile driver’s crane is of groundbreaking significance.Firstly, in a view of existing energy recovery technology and the characteristics of the working environment of the hydraulic static pile driver crane, two rotary braking energy recovery systems were designed. One was a common accumulator swing braking energy recovery system, achieving the storage and release of the rotating braking energy by the check valve. The other one was a secondary regulation swing braking energy recovery system, combined the secondary regulation and hydraulic accumulator energy recovery technology, which achieved rotation braking energy recycling through the adaptive fuzzy sliding mode controller making secondary elements work in four quadrants.Secondly, the original crane slewing system and two swing braking energy recovery systems were modeled and simulated by the AMESIM and MATLAB/simulink software. The simulation results show that:the original braking system loses a lot of braking energy through the overflow, but its rotation speed characteristics are good. The ordinary accumulator braking energy recovery system has a higher recovery rate of the braking energy, but the rotation speed characteristics are poor and uncontrollable. The secondary regulation swing braking energy recovery system not only has the highest recovery rate of the braking energy, but also has an ideal speed characteristic and excellent control performance under the control of the adaptive fuzzy sliding mode controller.Thirdly, the impact of system relevant parameters on the energy recovery rate of the secondary regulation rotary braking energy recovery system was analyzed by simulation. Some conclusions were drawn that the parameters of the accumulator has a little effect on the recovery of braking energy, which is closely related to the braking time and load.Finally, the experimental research has been taken using a secondary regulation swing braking energy recovery system text bed, achieve the adaptive fuzzy sliding mode control of the crane slewing speed with the combination of PLC and MATLAB under the OPC technology. The coincide experiment and simulation verifies the correctness of the simulation models and provides guidance for the secondary regulation swing braking energy recovery system being used on the hydraulic static pile driver crane.