基于Pro E的剪叉式液压升降平台的设计与仿真【中文2983字】
收藏
资源目录
压缩包内文档预览：
编号：10126786
类型：共享资源
大小：789.96KB
格式：ZIP
上传时间：2018-05-29
上传人：闰***
认证信息
个人认证
冯**（实名认证）
河南
IP属地：河南
15
积分
- 关 键 词：
-
基于
pro
剪叉式
液压
升降
平台
设计
仿真
中文
- 资源描述：
-
基于Pro E的剪叉式液压升降平台的设计与仿真【中文2983字】,基于,pro,剪叉式,液压,升降,平台,设计,仿真,中文
- 内容简介：
-
Available online at Procedia Engineering 16 (2011) 772 781International Workshop on Automobile, Power and Energy EngineeringDesign and Simulation Based on Pro/E for a Hydraulic Lift Platform in Scissors TypeTian Hongyu, Zhang ZiyiBeijing Union University, Beijing Chaowai baijiazhuang, Beijing 100020, ChinaAbstractScissors lift platform with a wide range, the main platform, lift mechanism and the bottom are composed of three parts. Lifting from low to high lifting, the scissors posts, and the hydraulic cylinder layout multiple, mobile way has traction, self-propelled, booster, etc. Scissors lift mechanism of scissors post number and cylinder layout by lifting height. This paper is about a design based 3D software Pro/E with 8m high scissors lift platform, which gives a entire platform dimension with 1800 900mm2. A rated load of features so that the whole platform can be set up by two pairs of scissors refers to like products. The platform is designed to be folded away doors, to save more space for convenient storage. Lift platform uses a hydraulic driver, which runs smoothly, stably, and accuracy factors relative to high. 2010 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Society for Automobile, Power and Energy Engineering Open access under CC BY-NC-ND license.Keywords: Lift platform; hydraulic drive; 3D design; Pro/E ;1. IntroductionScissors lift platform is the one of the vertical lifting equipment, which can be used indoor or outdoor with a considerable extensive space. It can be used in the mechanical industries, automatic production lines, the basements and physical distribution lines and so on. In order to fulfill the more and more using areas, scissors lift platform must be given higher and higher loading capability, faster and faster moving velocity and more and more steady starting and stopping of the platform.The scissors lift mechanism is the crucial constituent part of scissors lift platform, whose force characteristic will influence the performance of the whole equipment directly. Therefore, the most Corresponding author. Tel.: +86- 13671195535.E-mail address: jdthongyu.1877-7058 2011 Published by Elsevier Ltd. Open access under CC BY-NC-ND license.doi:10.1016/eng.2011.08.1153Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781 773important problem for the designing the platform is to resolve the structure dimension of the main departments such as the scissors posts, the bottom car and the upper platform, the hydraulic control parts and the driving hydraulic cylinder.There are many kinds of constructions for the scissors lift platform, but the main departments of the typical lift platform usually are the upper platform, the scissors posts and the bottom car. The numbers of the scissors posts and the position of the hydraulic cylinders even have different assortment, which determine the lifting height of the platform. In this paper, we give a height of 8m for the platform to lift.An about 1800900mm2 areas will be given for the upper platform to lift enough matters and a biggerrated loading capability can be gained. There are three manners for the bottom car to move as for dragging, automatic running and force aiding. The whole platform is designed to have a pair of scissors mechanisms, which are put on the bottom car for two parts symmetrically. Each scissors mechanism has four posts pairs to fulfill the height requirement.Using the three dimensions simulation software Pro/E, the mechanism design and simulation about the equipment of the scissors lift platform can be done just like the structures depicted upwards. The whole components 3D modeling, the simulated assembling and mechanism simulating are extruded though the software. During these simulations, the check of interference between the components can be given perfectly, as well as the problems likely can be avoided, which can improve that the mechanism design we have done is reliable.The design process of this mechanism simulation is given, which have several steps below, see figure 11.774 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781Fig. 1. Design process of simulation2. The plan design and the parameters determinationIn this design, an automatic running scissors lift platform is proposed, with the characteristic of the agility moving, lifting steadily, convenient operating, heavy carrying capacity etc.2.1. The main parameters determinationThe main parameters of the lift platform are described below. Rated carrying capacity with 500kg; Working height with 8m; Platform height with 6.2m; Platform areas with 1800 900mm2; Rated moving velocity upward with 69 m/min; Rated moving velocity downward with no more than 6 m/min.The moving velocity analyzed below. See figure 2. And the different comparison result of platform moving velocity has been given when the driving cylinder velocity is 1 m/min or 5 m/min. Though the figure of table 1, we can conclude that the faster the cylinder velocity moves, the sharper the platform is lift.Fig. 2. velocity analysesTable 1. Platform velocity comparisonAngle Degree 20 30 40 50 60cylinder velocity:1m/min 0.51 m/min0.75 m/min 0.96 m/min 1.15 m/min 1.30 m/mincylinder velocity:5m/min 9.6 m/min6.6 m/min 5.13 m/min 4.31 m/min 3.81 m/minWhen fix the platform velocity, the cylinder will gain a variable velocity. Because there had not given the limit to the upward velocity of the platform, we can choose the fixed hydraulic cylinder velocity and get a variable platform velocity for a simple design. So we apply the jack cylinder as the execution when design the hydraulic system, who can give a high strength and a suitable velocity upward which will notTian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781 775exceed the prescribed velocity limit of national standard. As the platform moves downward, the speed control valve can guarantee the value of the platform velocity with 5 m/min then the cylinder gives 3.8 m/min velocity.2.2. The plan designPlan 1: two hydraulic cylinders driving typeIn order to keep the platforms moving smoothly up and down, we can adopt two hydraulic cylinders type lift platform. See figure 3a. The cylinders are put vertically, which can save labors, give the scissors equality force. For the hydraulic system, using the type, the smaller pump working pressure is offering. The defect of this type is it needs the smoother floor because when the scissors posts are folded the cylinders are tending to touch the floor or other components.Plan 2: one hydraulic cylinder driving typeIn this type the hydraulic cylinder is put away (see figure 3b), which bring along the main post arm and others posts can move with the main one exploiting the hinge principle of mechanics. Without the equality force on the scissors posts, the equipment needs the bigger driving force than two hydraulic cylinders type. The advantage of the type is when the platform is folded more space is saving. But when starting the machine, the more heavy force must be given to the post in order to offer the bigger vertical force. So using this type platform, the higher pump working pressure must be offered to drive the hydraulic cylinder to extend.Fig. 3. (a) two hydraulic cylinders driving type platform; (b) one hydraulic cylinder driving type platform776 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781a bC In consideration of the application in a popular style and the saving space, one hydraulic cylinder driving type platform is determined to be the optimal plan. Adopt this plan, the cost will be saved as the number of the cylinders using.3. The structure design of the platformDepending on the parameters needed, the pair numbers have been determined to be four, the whole mechanism schematic diagram can be given, see figure 4.Fig. 4. mechanism schematic diagram of the platformIn view of the position of the hydraulic system and the space of the device according to the numbers from calculating, the inclined hydraulic cylinder structure is applied. See figure 5.G/ 2dFig. 5. inclined hydraulic cylinder structureTian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781 777In the platform, point c is fixed with a ream support, and point b and d leave a sliding ream supports with the bottom and the upper platform each other. When the same structure is used at point b and d, the parameters of the friction is the same one and is express as the letter f. All the scissors posts have the same length expressed as the letter l, whose weight are ignored when analyzing the forces. The inclined driving hydraulic cylinder is fixed to two scissors posts at whose middle points, see figure 5.Suppose that the included angle of the cylinders work line and the bottom is 日 , and a is the includedangle from the inclined scissors post to the bottom. The weights of the platform itself and the load on the platform are added to be G, and the force point of the weight has a distance from the point b expressed with the letter p. When the whole machine goes up and down, the distance of p will not be changed. See figure 6.G/2a p bBT C C d fdN dFig. 6. the scissors posts force analysisThe first step of force analysis of the scissors mechanism is the analysis to the whole scissors platform. The weight G is distributed the two scissors mechanism, so the single ones weight is G/2. The correlated forces are displayed below.Tc cos fd (1)Tc sin Nd 2 (2)fd f NdThe force analysis of upper platform can be seen in figure 7.G/2 (3)adFig. 7. the force analysis of the platformp bfT CN dG778 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781cy d c dTcx Tc cos fd f NdTcy Tc sin G T N T sin N(4)(5)2 (6)G p T l cos2 cy (7)Through the force analysis and the cooperation calculation, the force demanded can be gained.4. Modeling based on Pro/EIn traditional design of the mechanism, after the force analysis the design of the mechanical-drawing is a difficult work and will be spend most of the design time. But now, with the development of the computer technique, our design can be done on the computer, and the simulation of the mechanism can be seen before the prototype is born. Using the 3D software such as Pro/E, the whole time will be shorted and the design will be more scientific and with high feasibility.In consideration of the placement of the platform, the platform is designed with two doors which can be folded when needed. The enclosure of the platform is welded with the 2525 mm2 hollow heart posts, and the platform is made of steel sheet with the thickness of 6mm whose dimension is 1800900 mm2,see figure 8.Fig. 8. the platform modelTian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781 779When the doors of the upper platform are opened, the biggest angle will be 270 degree, so as to obtain more commodious space, see figure 9.Fig. 9. side door opening modelBoth the main enclosure and the two side doors can be folded together for bigger space, see figure 10.Fig. 10. the folded enclosure model780 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 (2011) 772 781The whole lift platform is designed based the software Pro/E, through which permit us to simulate the mechanism .See figure 11.Fig. 11. the whole lift platform model Procedia Engineering 16 ( 2011 ) 772 781 Available online at 1877-7058 2011 Published by Elsevier Ltd.doi: 10.1016/eng.2011.08.1153 International Workshop on Automobile, Power and Energy EngineeringDesign and Simulation Based on Pro/E for a Hydraulic LiftPlatform in Scissors TypeTian Hongyu, Zhang ZiyiBeijing Union University, Beijing Chaowai baijiazhuang, Beijing 100020, ChinaAbstractScissors lift platform with a wide range, the main platform, lift mechanism and the bottom are composed of threeparts. Lifting from low to high lifting, the scissors posts, and the hydraulic cylinder layout multiple, mobile way hastraction, self-propelled, booster, etc. Scissors lift mechanism of scissors post number and cylinder layout by liftingheight. This paper is about a design based 3D software Pro/E with 8m high scissors lift platform, which gives a entireplatform dimension with 1800 900mm2. A rated load of features so that the whole platform can be set up by twopairs of scissors refers to like products. The platform is designed to be folded away doors, to save more space forconvenient storage. Lift platform uses a hydraulic driver, which runs smoothly, stably, and accuracy factors relativeto high. 2010 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Society forAutomobile, Power and Energy EngineeringKeywords: Lift platform; hydraulic drive; 3D design; Pro/E ;1. IntroductionScissors lift platform is the one of the vertical lifting equipment, which can be used indoor or outdoorwith a considerable extensive space. It can be used in the mechanical industries, automatic productionlines, the basements and physical distribution lines and so on. In order to fulfill the more and more usingareas, scissors lift platform must be given higher and higher loading capability, faster and faster movingvelocity and more and more steady starting and stopping of the platform.The scissors lift mechanism is the crucial constituent part of scissors lift platform, whose forcecharacteristic will influence the performance of the whole equipment directly. Therefore, the mostCorresponding author. Tel.: +86- 13671195535.E-mail address: jdthongyu.Open access under CC BY-NC-ND license.Open access under CC BY-NC-ND license.773 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 important problem for the designing the platform is to resolve the structure dimension of the maindepartments such as the scissors posts, the bottom car and the upper platform, the hydraulic control partsand the driving hydraulic cylinder.There are many kinds of constructions for the scissors lift platform, but the main departments of thetypical lift platform usually are the upper platform, the scissors posts and the bottom car. The numbers ofthe scissors posts and the position of the hydraulic cylinders even have different assortment, whichdetermine the lifting height of the platform. In this paper, we give a height of 8m for the platform to lift.An about 1800900mm2areas will be given for the upper platform to lift enough matters and a biggerrated loading capability can be gained. There are three manners for the bottom car to move as for dragging,automatic running and force aiding. The whole platform is designed to have a pair of scissors mechanisms,which are put on the bottom car for two parts symmetrically. Each scissors mechanism has four postspairs to fulfill the height requirement.Using the three dimensions simulation software Pro/E, the mechanism design and simulation about theequipment of the scissors lift platform can be done just like the structures depicted upwards. The wholecomponents 3D modeling, the simulated assembling and mechanism simulating are extruded though thesoftware. During these simulations, the check of interference between the components can be givenperfectly, as well as the problems likely can be avoided, which can improve that the mechanism designwe have done is reliable.The design process of this mechanism simulation is given, which have several steps below, see figure 11.774 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 Fig. 1. Design process of simulation2. The plan design and the parameters determinationIn this design, an automatic running scissors lift platform is proposed, with the characteristic of theagility moving, lifting steadily, convenient operating, heavy carrying capacity etc.2.1. The main parameters determinationThe main parameters of the lift platform are described below. Rated carrying capacity with 500kg Working height with 8m; Platform height with 6.2m Platform areas with 1800900mm2 Rated moving velocity upward with 69 m/min; Rated moving velocity downward with no more than 6 m/min.The moving velocity analyzed below. See figure 2. And the different comparison result of platformmoving velocity has been given when the driving cylinder velocity is 1 m/min or 5 m/min. Though thefigure of table 1, we can conclude that the faster the cylinder velocity moves, the sharper the platform islift.Fig. 2. velocity analysesTable 1. Platform velocity comparisonAngle Degree 2030405060cylinder velocity:1m/min0.51 m/min 0.75 m/min 0.96 m/min 1.15 m/min 1.30 m/mincylinder velocity:5m/min9.6 m/min 6.6 m/min 5.13 m/min 4.31 m/min 3.81 m/minWhen fix the platform velocity, the cylinder will gain a variable velocity. Because there had not giventhe limit to the upward velocity of the platform, we can choose the fixed hydraulic cylinder velocity andget a variable platform velocity for a simple design. So we apply the jack cylinder as the execution whendesign the hydraulic system, who can give a high strength and a suitable velocity upward which will not775 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 exceed the prescribed velocity limit of national standard. As the platform moves downward, the speedcontrol valve can guarantee the value of the platform velocity with 5 m/min then the cylinder gives 3.8m/min velocity.2.2. The plan designPlan 1: two hydraulic cylinders driving typeIn order to keep the platforms moving smoothly up and down, we can adopt two hydraulic cylinderstype lift platform. See figure 3a. The cylinders are put vertically, which can save labors, give the scissorsequality force. For the hydraulic system, using the type, the smaller pump working pressure is offering.The defect of this type is it needs the smoother floor because when the scissors posts are folded thecylinders are tending to touch the floor or other components.Plan 2: one hydraulic cylinder driving typeIn this type the hydraulic cylinder is put away (see figure 3b), which bring along the main post arm andothers posts can move with the main one exploiting the hinge principle of mechanics. Without the equalityforce on the scissors posts, the equipment needs the bigger driving force than two hydraulic cylinders type.The advantage of the type is when the platform is folded more space is saving. But when starting themachine, the more heavy force must be given to the post in order to offer the bigger vertical force. Sousing this type platform, the higher pump working pressure must be offered to drive the hydraulic cylinderto extend.Fig. 3. (a) two hydraulic cylinders driving type platform; (b) one hydraulic cylinder driving type platform776 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 In consideration of the application in a popular style and the saving space, one hydraulic cylinderdriving type platform is determined to be the optimal plan. Adopt this plan, the cost will be saved as thenumber of the cylinders using.3. The structure design of the platformDepending on the parameters needed, the pair numbers have been determined to be four, the wholemechanism schematic diagram can be given, see figure 4.Fig. 4. mechanism schematic diagram of the platformIn view of the position of the hydraulic system and the space of the device according to the numbersfrom calculating, the inclined hydraulic cylinder structure is applied. See figure 5. Fig. 5. inclined hydraulic cylinder structure777 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 In the platform, point c is fixed with a ream support, and point b and d leave a sliding ream supportswith the bottom and the upper platform each other. When the same structure is used at point b and d, theparameters of the friction is the same one and is express as the letter f. All the scissors posts have the samelength expressed as the letter l, whose weight are ignored when analyzing the forces. The inclined drivinghydraulic cylinder is fixed to two scissors posts at whose middle points, see figure 5.Suppose that the included angle of the cylinders work line and the bottom is, and is the includedangle from the inclined scissors post to the bottom. The weights of the platform itself and the load on theplatform are added to be G, and the force point of the weight has a distance from the point b expressedwith the letter p. When the whole machine goes up and down, the distance of p will not be changed. Seefigure 6. Fig. 6. the scissors posts force analysisThe first step of force analysis of the scissors mechanism is the analysis to the whole scissors platform.The weight G is distributed the two scissors mechanism, so the single ones weight is G/2. The correlatedforces are displayed below.dcfT = cos(1)2sinGNTdc=+ (2)ddNff =(3)The force analysis of upper platform can be seen in figure 7. Fig. 7. the force analysis of the platform778 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 ddccxNffTT = cos(4)sin=ccyTT(5)dcdcyNTNTG+=+= sin2(6)cos2lTpGcy=(7)Through the force analysis and the cooperation calculation, the force demanded can be gained.4. Modeling based on Pro/EIn traditional design of the mechanism, after the force analysis the design of the mechanical-drawing isa difficult work and will be spend most of the design time. But now, with the development of thecomputer technique, our design can be done on the computer, and the simulation of the mechanism can beseen before the prototype is born. Using the 3D software such as Pro/E, the whole time will be shortedand the design will be more scientific and with high feasibility.In consideration of the placement of the platform, the platform is designed with two doors which canbe folded when needed. The enclosure of the platform is welded with the 2525 mm2hollow heart posts,and the platform is made of steel sheet with the thickness of 6mm whose dimension is 1800900 mm2,see figure 8.Fig. 8. the platform model779 Tian Hongyu and Zhang Ziyi / Procedia Engineering 16 ( 2011 ) 772 781 When the doors of the upper platform are opened, the biggest angle will be 270 degree, so as to obtainmore commodious space, see figure 9.Fig. 9. side door opening
- 温馨提示:
1: 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
人人文库网所有资源均是用户自行上传分享，仅供网友学习交流，未经上传用户书面授权，请勿作他用。
川公网安备: 51019002004831号