2022年压力机液压系统 .pdf
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1、eaintheacci dentinvestigation,managementandreporting,ea chpostshouldbe devel opedunderthissystemspecialistscheck,cleartheexaminations,time,cyclesa ndotherrelevantregulations.Strengthe ningsitesupervisiona ndexamination,todetectandinvestigateillegalcommand,illegaloperationsandviolationsofoperatingrul
2、es.Secondsafetyreferstotheproductionsite,technologymanagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheextentofthesecurityrisks,solvingisdividedintoa,b,andclevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-cla ss:difficult
3、toresolvedifficulties,shallconsistofminingorganizationstosolveproblems.C-cla ss:fromsegmentsandbusinessriskst hatmustbeaddressedintheDe partment.2,open-pitmineunsafetypesincl ude :ele ctrical,transport,blasting,fire,andotherslope.3,accordingtothesev erityofthehazardfilledinbyunittroubleshooting,regi
4、strationform(seeatt目 录一 液压系统原理设计11 工况分析1 2 拟定液压系统原理图4 二 液压缸的设计与计算6 1 液压缸主要尺寸的确定6 2 液压缸的设计7 三 液压系统计算与选择液压元件101 计算在各工作阶段液压缸所需的流量10 2 确定液压泵的流量 , 压力和选择泵的规格 10 3 液压阀的选择12 4 确定管道尺寸 2 液压缸的设计12 5 液压油箱容积的确定12 6 液压系统的验算12 7 系统的温升验算15 8 联接螺栓强度计算16 四 设计心得17 五 参考文献17 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -
5、第 1 页,共 14 页eaintheacci dentinvestigation,managementandreporting,ea chpostshouldbe devel opedunderthissystemspecialistscheck,cleartheexaminations,time,cyclesa ndotherrelevantregulations.Strengthe ningsitesupervisiona ndexamination,todetectandinvestigateillegalcommand,illegaloperationsandviolationsof
6、operatingrules.Secondsafetyreferstotheproductionsite,technologymanagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheextentofthesecurityrisks,solvingisdividedintoa,b,andclevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-cla
7、ss:difficulttoresolvedifficulties,shallconsistofminingorganizationstosolveproblems.C-cla ss:fromsegmentsandbusinessriskst hatmustbeaddressedintheDe partment.2,open-pitmineunsafetypesincl ude :ele ctrical,transport,blasting,fire,andotherslope.3,accordingtothesev erityofthehazardfilledinbyunittroubles
8、hooting,registrationform(seeatt一 液压系统原理设计1 工况分析设计一台小型液压压力机的液压系统,要求实现:快速空程下行慢速加压保 压 快 速 回 程 停 止 工作 循 环 。快 速 往 返速 度 为3m/min ,加 压 速 度为40-250mm/min,压制力为 N,运动部件总重力为25000N,工作行程 400mm,油缸垂直安装,设计压力机的液压传动系统。液压缸所受外负载F 包括五种类型,即:F= F压+ F磨+F惯+F密+G式中:F压- 工作负载,对于液压机来说,即为压制力;F惯- 运动部件速度变化时的惯性负载;F磨- 导轨摩擦阻力负载,启动时为静摩擦阻力
9、。液压缸垂直安装,摩擦力相对于运动部件自重,可忽略不计;F密- 由于液压缸密封所造成的运动阻力;G- 运动部件自重。液压缸各种外负载值1) 工作负载:液压机压制力 F压=N2) 惯性负载:NtgVGF20.255103.08.9325000惯3) 运动部件自重:G=25000N4) 密封阻力F密=0.1F( F 为总的负载 ) 5) 摩擦力液压缸垂直安装,摩擦力较小,可忽略不计。精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 2 页,共 14 页eaintheacci dentinvestigation,managementandreporting
10、,ea chpostshoul dbe developedunderthissystemspecialistscheck,cleartheexaminatons,time,cyclesandotherrelevantregulations.Strengtheningsitesupervisiona ndexamination,todete ctandinvestigateillegalcommand,i llegaloperationsandviolationsofoperatingrules.Secondsafetyreferstotheproductionsite,technologyma
11、nagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheextentofthesecurityrisks,solvingisdividedintoa,b,andclevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-class:difficulttoresolvedifficulties,shallconsistofminingorganization
12、stosolveprobl ems.C-class:fromsegmentsandbusinessrisksthatmustbeaddressedint heDepartment.2,open-pitmineunsafetypesincl ude:electrical,transport,blasting,fire,andotherslope.3,accordingtotheseverityofthehazardfilledinbyunittroubleshooti ng,registrationform(seeatt根据上述计算结果,列出各工作阶段所受的外负载。工作循环各阶段外负载表工况计算
13、公式液压缸的负载启动阶段:F启=F密+F惯-GNGFF89.5669.02500020.255109.0惯启加速阶段:F加=F密+F惯-GNGFF89.5669.02500020.255109.0惯加快进阶段:F快=F密-GNGF22500)(9.0快工进阶段:F工=F密+F压-GNGFF56.3055559.0250003000009.0压工快退阶段:F退=F密+GNGF78.277779.0250009.0退按照给定要求与外负载表绘制速度循环图与负载循环图:速度循环图:精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 3 页,共 14 页eain
14、theacci dentinvestigation,managementandreporting,ea chpostshouldbe devel opedunderthissystemspecialistscheck,cleartheexaminations,time,cyclesa ndotherrelevantregulations.Strengthe ningsitesupervisiona ndexamination,todetectandinvestigateillegalcommand,illegaloperationsandviolationsofoperatingrules.S
15、econdsafetyreferstotheproductionsite,technologymanagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheextentofthesecurityrisks,solvingisdividedintoa,b,andclevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-cla ss:difficulttore
16、solvedifficulties,shallconsistofminingorganizationstosolveproblems.C-cla ss:fromsegmentsandbusinessriskst hatmustbeaddressedintheDe partment.2,open-pitmineunsafetypesincl ude :ele ctrical,transport,blasting,fire,andotherslope.3,accordingtothesev erityofthehazardfilledinbyunittroubleshooting,registra
17、tionform(seeatt负载循环图:50 L(mm) V (mm /s) 0.674.17 50 400 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 4 页,共 14 页eaintheacci dentinvestigation,managementandreporting,ea chpostshoul dbe developedunderthissystemspecialistscheck,cleartheexaminatons,time,cyclesandotherrelevantregulations.Strengtheningsi
18、tesupervisiona ndexamination,todete ctandinvestigateillegalcommand,i llegaloperationsandviolationsofoperatingrules.Secondsafetyreferstotheproductionsite,technologymanagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheextentofthesecurityrisks,solvingisdividedintoa,b,and
19、clevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-class:difficulttoresolvedifficulties,shallconsistofminingorganizationstosolveprobl ems.C-class:fromsegmentsandbusinessrisksthatmustbeaddressedint heDepartment.2,open-pitmineunsafetypesincl ude:electrical,
20、transport,blasting,fire,andotherslope.3,accordingtotheseverityofthehazardfilledinbyunittroubleshooti ng,registrationform(seeatt2 拟定液压系统原理图1) 确定供油方式:考虑到该压力机在工作进给时需要承受较大的工作压力,系统功率较大,速度较底。而在快进 , 快退时负载较小,速度较快。从节能,减少发热,系统结构,效率,工作压力等方面考虑,泵源系统宜选用轴向柱塞泵。2) 调速方式的选择:在小型压力机液压系统中,进给速度的控制一般采用节流阀或者调速阀。在本系统中选用回油节流调
21、速,3)速度切换方式的选择:系统采用由电磁阀控制的快慢速换接回路,它的结构简单,调节行程比较方便,阀的安装也较容易,但速度换接的平稳性较差。若要提高系统的速度换L(mm) 400 566 22500 F(N) 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 5 页,共 14 页eaintheacci dentinvestigation,managementandreporting,ea chpostshouldbe devel opedunderthissystemspecialistscheck,cleartheexaminations,time
22、,cyclesa ndotherrelevantregulations.Strengthe ningsitesupervisiona ndexamination,todetectandinvestigateillegalcommand,illegaloperationsandviolationsofoperatingrules.Secondsafetyreferstotheproductionsite,technologymanagement,equi pment,facilities,andsooncanleadtoaccidentsrisksexist.1,accordingtotheex
23、tentofthesecurityrisks,solvingisdividedintoa,b,andclevelsofdifficulty;A-level:difficult,miningdifficulties,shallbereportedtothecompanysproblems.B-cla ss:difficulttoresolvedifficulties,shallconsistofminingorganizationstosolveproblems.C-cla ss:fromsegmentsandbusinessriskst hatmustbeaddressedintheDe pa
24、rtment.2,open-pitmineunsafetypesincl ude :ele ctrical,transport,blasting,fire,andotherslope.3,accordingtothesev erityofthehazardfilledinbyunittroubleshooting,registrationform(seeatt接平稳性,可改用由行程阀切换速度的换接回路。液压系统原理图:二 液压缸的设计与计算1 液压缸主要尺寸的确定工作压力 p 的确定:工作压力 p 可根据负载大小及机器类型初步确定, 先查表取液压缸工作压力为25MPa. 设备类型机床农业机械或
25、中型工程机械液压机、重型机械、 起重运输机械磨床组合机床龙门刨床拉床工作压力 P(MPa)0.82.0 35 28 810 1016 2032 液压缸缸筒内径 D 和液压缸活塞杆外径d 的确定:由液压缸缸筒内径(缸径)尺寸系列表查得D=160mm。活塞直径 d,按 d/D=0.7, d=112mm。由液压缸活塞杆外径(杆径)尺寸系列表,取d=125mm。由此求得液压缸的实际有效面积为:22210201.0416.04mDA2222220078.04)125.016.0(4)(mdDA初步计算液压缸最大工作压力:MPaAFPn20.150201.056.3055551精选学习资料 - - - -
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