| The concrete pillar of railway catenary is an important supporting equipment of electrified railway station or section,and its safety determines whether the train can run normally.However,due to the long-term exposure of OCS concrete pillars to harsh environment,which leads to the aging of concrete pillars and reduces its safety,it is necessary to replace or dismantle the aging or waste railway OCS concrete pillars.In the process of replacing or demolishing the concrete pillars of OCS,in order to load the huge and bulky waste pillars and transport them to the designated crushing place,it is necessary to cut the whole pillar.At present,there is no cutting device for the concrete pillar of OCS in the market,and the main concrete cutting methods are disc rotary saw and chain rope saw.Therefore,through the comparison of the advantages and disadvantages of the two cutting methods,this paper proposes a segmented cutting device for OCS concrete pillar,and the device adopts full hydraulic drive.The main contents of this paper are as follows:(1)By comparing the advantages and disadvantages of the existing concrete cutting methods,this paper puts forward a reciprocating saw hydraulic system segment cutting device for the railway catenary concrete pillar,and determines the design requirements of the hydraulic system.The three-dimensional model of reciprocating saw segmented cutting device is established by using Solid Works software of Dassault company in France,and the working principles of the clamping device,the cutting device,the feeding device and the tool changing device are analyzed respectively analysis.(2)According to the design requirements,the hydraulic schematic diagram of each circuit of the hydraulic system of reciprocating saw is designed,and the design of the hydraulic system schematic of the whole reciprocating saw is completed.By calculating and analyzing the load and awesome force of the hydraulic system of the reciprocating saw,the working pressure of the hydraulic system is determined,and then the selection and calculation of the executive elements,power components,valves and auxiliary components of the hydraulic system are carried out according to the calculation results.(3)The standard library(HYD)of LMS Imagine.Lab AMESim software is used to establish the simulation model of the hydraulic system of reciprocating saw,and the hydraulic design library(HCD)is used to establish the model of the shunt valve.Then the AMESim simulation parameters are set and simulated according to the calculation results of each hydraulic component.The simulation results show that the hydraulic system of the reciprocating saw can meet the design requirements.The rationality and feasibility of the design of the hydraulic system of the reciprocating saw are proved from the perspective of simulation.At the same time,the pressure characteristics of the cutting circuit and the factors affecting the pressure of the cutting circuit are analyzed.(4)This paper analyzes the suppression method of the peak pressure of the cutting circuit,and proposes to use the air bag accumulator to optimize the hydraulic system,so that the average peak pressure is reduced from 15.91 MPa to 12.623 MPa.Through the simulation analysis of the influence of the parameters of the airbag accumulator on the commutation hydraulic impact,it provides the basis for the optimization of the key parameters of the accumulator.Sequential quadratic programming(NLPQL)algorithm is used to optimize the key parameters of the accumulator.After optimization,the average peak pressure of reversing impact is reduced from 12.623 MPa to 10.23 MPa,and the average peak pressure is reduced by18.9%.(5)Design the hydraulic system test cutting device and hydraulic schematic diagram of reciprocating saw,draw CAD parts processing drawings,purchase relevant hydraulic components,complete the construction of the hydraulic system test device of reciprocating saw,then debug and run the test cutting device,finally complete the test,and verify the rationality and feasibility of the hydraulic system of reciprocating saw through the test results. |
