傾卸車提升機構(gòu)設(shè)計優(yōu)化外文翻譯、中英文翻譯、外文文獻(xiàn)翻譯,傾卸,提升,機構(gòu),設(shè)計,優(yōu)化,外文,翻譯,中英文,文獻(xiàn) Mine design and optimization of lifting mechanism of dumping truck Li-Ronghao1,a,Yang-Jue2,b and Peng-Lilong3,c 1,2,3School of Mechanical Engineering,University of Science and Technology Beijing Beijing,China ,, keywords:Mining equipments,Lifting mechanism,Ground protection,Matlab.Abstract.Lifting mechanism is one of the most important work system.Its design quality directly influences the using performance of mining dump truck.The dissertation takes large dump truck as research object,with the knowledge of the mechanism dynamics for the top rear lifting mechanism of dump truck for innovative design,using the optimization function of MATLAB make the lifting mechanism optimal,to articulated point lifting mechanism the reasonable optimally lay out,and improves the lifting organization performance fundamentally.1.Introduction The old design of lifting mechanism of dump truck,when building a mathematical model,on the hypothesis premise of the total mass in the the goods in carriage and center of mass position invariance.The stress of the lifting mechanism will increase because of packing case forward center of mass during lifting uninstall,this point is rarely considered,but it has a great influence on.Common carriage and bucket type car unloading is presented in this paper mathematical model of center of mass in the process of change,it lays the foundation for lift unloading process of lifting mechanism design.Large dump trucks for vehicle,Schematic Fig 1.1:Fig 1.1 Large dump truck vehicle figure Fig 1.2 Three-dimensional containerstowage way 1.1 The basic parameters of the selected Structure is mining shovel car of the train,the goods rest Angle of choice for 30/30-45,stow cargo car adopts 1/2 stowage method,the specific shape as shown in figure 1.2 the pink area.1.2 Mathematical model of bucket type hopper car process Establish a car as the origin of coordinates,hinge pin point O level to the left for the X axis is left hand,right Angle coordinate system As shown in figure 1.3.It can be easily to find the lifting process at any time in the car innage quality and center of mass position.In the process of dumping,carriage of goods by full quality decrease to 0,increasing from 0 to the maximum lift Angle demotion Anglem.Between the car demotion Angle and the quality of innage is nonlinear relationship,can be segmented analysis.Interface of goodsDZ1 in the process of lifting,andZZ32,ZZ43,ZZ54,ZZ65 the edge of the intersection D for a floating point,when the point D to pointZ6,namely all unload goods.Carriage when the initial position coordinates of each point)i(),y,x(ZZiZii6100=,with crate on both sides of the side plate plane intersection)j(),y,x(Wwjwjj6100=,both ends of container vertex coordinates,),),(k,y(xHHkHkk2100=Carriage barycentric coordinates G(gx,gy),Carriage weight W,Carriage width L.Advanced Materials Research Vols.760-762(2013)pp 1274-1277Online available since 2013/Sep/18 at (2013)Trans Tech Publications,Switzerlanddoi:10.4028/ rights reserved.No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of TTP,.(ID:140.116.207.56,National Cheng Kung University,Tainan,Taiwan-14/04/14,17:10:31)Fig 1.3 Lift unloading process 2 The lifting mechanism design 2.1 Mechanical model of lifting mechanism Lifting process,assuming the plane parallel to the horizontal plane on the frame,wheel in the ground level completely,oil cylinder force around the same in the process of lifting.Under ground contact A connected to the frame,on the ground are connected to the crate contact B,point O for crate and frame on the coordinate system of ground contact.point C is point B for rotating lifting Angle,point M is crate has not lifting the centroid position,the point G is not lifting the centroid position of goods,and N is the barycentric position of the container the lifting Angle.Point A,B,M,G coordinates are(ax,ay),(bx,by),(mx,my),(gx,gy).Fig 2.1 Lifting coordinates 2.2 The size of the lifting mechanism design In order to guarantee the vehicle structure is compact,simple process,low failure rate,make the geometry size of each components in the lifting mechanism and institutions in the initial state position occupied a very small space,does not appear in the process of exercise intervention into consideration at the same time,so as to guarantee the mechanism motion coordination.First of all,according to the cargo rest Angle of lifting mechanism of selecting maximum demotion Angle.Through the above parameters,the installation of the lifting oil cylinder can be determined the length of AB and largest demotion Angle.)y(y)x(xABbaba+=there is a formulaAOBcosOBOAOBOAAB+=222 obtain a result AOB Lifting is determined to the greatest extent:AOCcosOBOAOBOAAC+=222 (1)The lifting cylinder stroke:ABACL=The first level of cylinder bore Advanced Materials Research Vols.760-7621275222112)yy()xx(yxyxp)xgmxgmK(dbabaabbamg+=(2)And the roundness result shall be according to the provisions of the state standard,after work back calculation of hydraulic pressure.Determination of lifting the first class I cylinder inner diameter:When lifting the first level will be stretched out,crate corner.Point B to point C,Point M to point N 22212)yy()xx(yxyxp)xgmxgmK(dcacaaccangi+=(3)This can be determined,when lifting the first class the first level will be out of the lift cylinder bore size.Fig2.2 The lifting cylinder 3.The ground contact location optimization Elongation before and after the optimization with the lifting Angle contrast figure(solid line is optimized,the dotted line in order to optimize the former)Lifting force before and after the optimization with the lifting Angle contrast figure(solid line is optimized,the dotted line in order to optimize the former)Fig 3.1 Lifting cylinder contrast figure Fig 3.2 Lifting force contrast figure Lifting hydraulic cylinder with the lifting Angle variation before and after optimization Fig 3.3 Before the optimization Fig 3.4 After the optimization(1)After optimization,the lifting cylinder elongation curve and offset a lifting force curve,the maximum lifting thrust and lift elongation reduced 3.6%and 4%respectively,lifting performance is greatly improved.1276Optoelectronics Engineering and Information Technologies in Industry(2)After optimization,the initial position is 875 kn lifting force,reduced by 6%than before optimization,lifting oil pressure 19.4 MPa,reduced by 4.3%than before optimization,Obviously,the optimized for hydraulic lifting mechanism at the initial position is low,gradually with the increase of turn Angle increases,the turning Angle is about 30 degrees when maximum,maximum oil pressure is higher than the initial value,and in the process of the dump,oil pressure curve flat,oil pressure fluctuation coefficient is small,accord with the requirement of hydraulic characteristic curve(3)After optimization,the initial position of lifting force,the lift is better than the before optimization and lifting hydraulic,even during the second half of the lifting process has reached levels before optimization.Optimization design based on MATLAB parameter coordinates,it can map out the lifting installation location after optimized design,as shown below:Fig 3.4 The optimized lifting location map Summary Based on studies of lifting system on the basis of both domestic and overseas,according to the bucket type car dumping process mathematical model of the mining machinery parts of innovative design of lifting mechanism of tipper,and MATLAB optimization theory is applied to the mining equipments in the design of the lifting mechanism,a mathematic model of the mine lifting mechanism of dump truck,lifting capacity and the lift as the objective function to optimize design,considered the boundary constraints,the lifting cylinder maximum pendulum Angle,installation length constraints,not to interfere in constraints such as constraint conditions,realize the optimal design of lifting mechanism References 1 Wei Xiang,Sai Cheong Fok,Georg Thimm.Agent-based Composable Simulation for Virtual Prototyping of Fluid Power System.Computers in Industry.2004,54(3):237251.2 Peter Beater，Martin Otter.Multi-Domain simulation:Mechanics and Hydraulics of an Excavator.Proceedings of the 3rd International Modelica Conference，2003 3 Kong Xiaowu，Qiu Minxiu,Wei Jianhua.A Atudy of the Influences of Pipe on Valve Control Hydraulics System.Proceedings of the 15th Internation Conference on Fluid Power Transmission and Control(ICFP2001),2001.4 Michael Decken,Hubertus Murrenhoff.Simulation of Fluid Power Components Using DSHplus and ADAMS.2001 ASME International Mechanical Engineering Congress and Exposition.2001.5 Nong Zhang,Wade Smith,Jeku Jeyakumaran.Hydraulically interconnected vehicle suspension:background and modeling J.Vehicle System Dynamics:2010,(1):17-40.Funded project number:Z101103055010004.Beijing science and technology committee Advanced Materials Research Vols.760-7621277Optoelectronics Engineering and Information Technologies in Industry 10.4028/ Mine Design and Optimization of Lifting Mechanism of Dumping Truck 10.4028/