REXROTH溢流阀DBDS10G1A/100 R900424738,德国力士乐溢流阀订货号和型号,现货库存产品,价格优惠,上海韦米机电设备有限公司主营销售产品,原厂原装,热诚欢迎新老客户咨询购买!
压力控制阀
压力控制阀的作用:
1、用来控制液压系统中油液压力;
1)溢流阀:直动式溢流阀、先导式溢流阀
2)减压阀
2、以压力为控制信号实现油路通断。
3)顺序阀
4)压力继电器
共同工作原理:利用作用于阀心上的液压力与弹簧力相平衡的原理进行工作。
溢流阀应用实例
(1)为定量泵系统溢流稳压和定量泵、节流阀并联,阀口常开。
(2)变量泵系统提供过载保护
和变量泵组合,正常工作时阀口关闭,过载时打开,起安全保护作用,故又称安全阀。
(3)实现远程调压 p远程< p主调
(4)系统卸荷和多级调压 和二位二通阀组合(先导式)
(5)形成背压
减压阀用于降低并稳定系统中某一支路的油液压力,常用于夹紧、控制等油路中。
顺序阀是一种利用压力控制阀口通断的压力阀,因用于控制多个执行元件的动作顺序而得名。按控制油来源不同分内控和外控,按弹簧腔泄漏油引出方式不同分内泄和外泄。
压力继电器功用:根据系统压力变化,自动接通或断开电路,实现程序控制或安全保护。
工作原理: pk> pT时,柱塞上升,发出信号pk< pT时,柱塞下降,断开信号。
流体控制是利用流体的各种控制元件(各种泵、阀门、油缸)及液压系统附件(过滤器、管路接头、液位计、压力仪表等),组成控制闭式回路,以进行自动控制。按其工作介质可分为以下两种:
(1)液压控制 液压控制用油液作为工作介质,故能把由于功率的损耗而产生的热量,从发生的地方带到别处,这样在一定的功率情况下,可以大大减小部件的尺寸;从负载的影响看,液压系统具有机械上的刚性,用在闭环系统中,定位刚度较大,位置误差较小;与机械机构相比,液压执行器的响应速度较高,能高速启动、制动与反向,同时其力矩—惯量比也较大,因而其加速能力较强;液压传动易实现无级调速,具有自身润滑等优点。
液压系统的缺点是:由于难以避免漏油,因而会影响运动的平稳性,并使效率降低;油液被尘埃或流体截止中其他杂质污损后,会造成液控系统发生故障;油液具有易燃性,有引起爆炸的危险;液体粘度受温度影响,使供油量和执行机构的运动速度不稳定;油液中有空气会引起工作机构的不均匀跳动;就处理小功率信号的数学运算、误差检测、放大、测试与补偿等功能而言,液压装置不如电子或机电装置那样灵活、线性、准确和方便,因而在控制系统的小功率部分,一般不宜采用,主要应用于系统的动力部分。
REXROTH溢流阀DBDS10G1A/100 R900424738
德国力士乐REXROTH溢流阀订货号和型号:
R900424738 DBDS10G1A/100
R900364483 DBDS10G1A/100SO130
R900409673 DBDS10G1A/100SO450
R900342450 DBDS10G1A/100SO74
R900439606 DBDS10G1A/100W1
R900567555 DBDS10G1A/100W100
R900347490 DBDS10G1A/100W40
R900916880 DBDS10G1A/100-075/12
R901020245 DBDS10G1A/100-25/59
R901020237 DBDS10G1A/100-30/59
R901005956 DBDS10G1A/100-35
R901156100 DBDS10G1A/100-40
R901370855 DBDS10G1A/100-50
R901060953 DBDS10G1A/100-55
R901189278 DBDS10G1A/100-60
R900953867 DBDS10G1A/100-70
R900341363 DBDS10G1A/100/12
R900436001 DBDS10G1A/100/2
R900470504 DBDS10G1A/100/5
R901256798 DBDS10G1A/100/59
R900572352 DBDS10G1A/100B
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R901052283 DBDS10G1A/100J=TE
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R900466366 DBDS10G1A/110/5B
R900423744 DBDS10G1A/110B
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R900560483 DBDS10G1A/315SO770
R900472760 DBDS10G1A/315W1
R901213049 DBDS10G1A/315-120
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R900919942 DBDS10G1A/315-220
R900939820 DBDS10G1A/315-220V
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R900724592 DBDS10G1A/315-275
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R900572907 DBDS10G1A/350B
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R901004635 DBDS10G1A/360E
R900776416 DBDS10G1A/370E
R900572908 DBDS10G1A/375B
R901419086 DBDS10G1A/375E
R900424744 DBDS10G1A/400
R900340395 DBDS10G1A/400SO32
R900337132 DBDS10G1A/400W1
R901421159 DBDS10G1A/400-320
R900967544 DBDS10G1A/400-330
R901283265 DBDS10G1A/400-350
R900934571 DBDS10G1A/400-350V
R900558953 DBDS10G1A/400-370
R901243540 DBDS10G1A/400-400
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R900535540 DBDS10G1A/400/2
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R900424799 DBDS10G1A/400B
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R901052290 DBDS10G1A/400J=TE
R901147801 DBDS10G1A/400P140
R901348424 DBDS10G1A/400P350V
R901055558 DBDS10G1A/400P370
R901356605 DBDS10G1A/400P400
R900437349 DBDS10G1A/400V
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R901260710 DBDS10G1A/400VE
R900904087 DBDS10G1A/40B
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R900572966 DBDS10G1A/420B
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R900915769 DBDS10G1A/420VB
R900979785 DBDS10G1A/440B
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R900424745 DBDS10G1A/50
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R900401662 DBDS10G1A/50SO50
R900366553 DBDS10G1A/50SO74
R900443130 DBDS10G1A/50W1
R900389365 DBDS10G1A/50W40
R900971932 DBDS10G1A/50-15
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R900572351 DBDS10G1A/90B
R901167026 DBDS10G1A/95E
挤出机是属于塑料机械的种类之一
挤出机依据机头料流方向以及螺杆中心线的夹角,可以将机头分成直角机头和斜角机头等。
螺杆挤出机是依靠螺杆旋转产生的压力及剪切力,能使得物料可以充分进行塑化以及均匀混合,通过口模成型。塑料挤出机可以基本分类为双螺杆挤出机,单螺杆挤出机以及不多见的多螺杆挤出机以及无螺杆挤出机。
在挤出机中,一般情况下,基本和通用的是单螺杆挤出机。其主要包括:传动、加料装置、料筒、螺杆、机头和口模等六个部分。
传动部分
传动部分通常由电动机,减速箱和轴承等组成。在挤出的过程中,螺杆转速必须稳定,不能随着螺杆负荷的变化而变化,这样才能保持所得制品的质量均匀一致。但是在不同的场合下又要要求螺杆可以变速,以达到一台设备可以挤出不同塑料或不同制品的要求。因此,本部分一般采用交流整流子电动机、直流电动机等装置,以达到无级变速,一般螺杆转速为10~100转/分。
传动系统的作用是驱动螺杆,供给螺杆在挤出过程中所需要的力矩和转速,通常由电动机、减速器和轴承等组成。而在结构基本相同的前提下,减速机的制造成本大致与其外形尺寸及重量成正比。因为减速机的外形和重量大,意味着制造时消耗的材料多,另所使用的轴承也比较大,使制造成本增加。
同样螺杆直径的挤出机,高速的挤出机比常规的挤出机所消耗的能量多,电机功率加大一倍,减速机的机座号相应加大是必须的。但高的螺杆速度,意味着低的减速比。同样大小的减速机,低减速比的与大减速比的相比,齿轮模数增大,减速机承受负荷的能力也增大。因此减速机的体积重量的增大,不是与电机功率的增大成线性比例的。如果用挤出量做分母,除以减速机重量,高速的挤出机得数小,普通挤出机得数大。以单位产量计,高速挤出机的电机功率小及减速机重量小,意味着高速挤出机的单位产量机器制造成本比普通挤出机低。
加料装置
供料一般大多采用粒料,但也可以采用带状料或者粉料。装料设备通常都使用锥形加料斗,其容积要求至少能提供一个小时的用量。料斗底部有截断装置,以便调整和切断料流,在料斗的侧面装有视孔和标定计量的装置。有些料斗还可能带有防止原料从空气中吸收水分的减压装置或者加热装置,或者有些料筒还自带搅拌器,能为其自动上料或加料。
料筒
一般为一个金属料桶,为合金钢或者内衬为合金钢的复合钢管制成。其基本特点为耐温耐压强度较高,坚固耐磨耐腐蚀。一般料筒的长度为其直径的15~30倍,其长度以使物料得到充分加热和塑化均匀为原则。料筒应该有其足够的厚度与刚度。内部应该光滑,但是有些料筒刻有各种沟槽,以增大与塑料的摩擦力。在料筒外部附有电阻、电感以及其他方式加热的电热器、温度自控装置及冷却系统。
螺杆
螺杆是挤出机的关键部件,螺杆的性能好坏,决定了一台挤出机的生产率、塑化质量、填加物的分散性、熔体温度、动力消耗等。是挤出机重要的部件,它可以直接影响到挤出机的应用范围和生产效率。通过螺杆的转动对塑料产生极压的作用,塑料在料筒中才可以发生移动、增压以及从摩擦中获取部分热量,塑料在料筒中移动的过程中获得混合和塑化,黏流态的熔体在被挤压而流经口模时,获得所需的形状而成型。与料筒一样,螺杆也是用高强度、耐热和耐腐蚀的合金制备而成。
锻压机械是指在锻压加工中用于成形和分离的机械设备。锻压机械包括成形用的锻锤、机械压力机、液压机、螺旋压力机和平锻机,以及开卷机、矫正机、剪切机、锻造操作机等辅助机械。锻压机械主要用于金属成形,所以又称为金属成形机床。锻压机械是通过对金属施加压力使之成形的,力大是其基本特点,故多为重型设备,设备上多设有安全防护装置,以保障设备和人身安全。
锻压机械主要包括各种锻锤、各种压力机和其他辅助机械。
锻锤,由重锤落下或强迫高速运动产生的动能对坯料做功,使之塑性变形的机械。锻锤是常见、历史悠久的锻压机械。它结构简单,工作灵活,功能性强、使用面广、易于维修,适用于自由锻和模锻。但震动较大,较难实现自动化生产。
锻锤的工作原理
锻锤靠高压气体突然释放的能量驱动上,下锤头高速运动,悬空对击,是金属塑性成形的锻造方法。高速锤锻造是一种高能率成形方法,主要用于精密模锻和热挤压。
瞬间释放的高压气体(压力一般为15000兆帕,迫使锤头向下作9~24米/秒的高速运动,同时也向上推动高压气缸的缸盖,并带动整个机架向上运动。锤头上的上模与机架上的下模在空中对击工件,使之塑性变形。机架的质量远大于锤体,所以移动速度慢,行程小,便于操作。锤击后,安装在机架内的回程杆将锤头推回原处。机架放置于外支架的缓冲垫上。这类设备初只能一次单击,后来研制出可以连击的﹑内燃式的高速锤。高速锤锻造,存在明显的变形惯性力和变形热效应,控制得当可以提高金属的塑性,改善金属在模具中的流动充填性能,利用模锻可成形薄壁﹑高肋的复杂形状锻件。高速锤锻造多用于叶片﹑齿轮等零件的精锻和挤压。
一、液压传动技术的应用
液压传动技术在近代工业制造中的应用
液压传动有许多突出的优点,因此它的应用非常广泛,如一般工业用的塑料加工机械、压力机械、机床等,行走机械中的工程机械、建筑机械、农业机械、汽车等;钢铁工业用的冶金机械、提升装置、轧辊调整装置等;土木水利工程用的防洪闸门及堤坝装置、河床升降装置、桥梁操纵机构等,发电厂涡轮机调速装置、发电厂等等。
二、液压传动技术的原理与特点
1、液压传动的介绍
液压传动是用液体作为工作介质来传递能量和进行控制的传动方式。液压传动和气压传动并称为流体传动,是根据17世纪帕斯卡提出的液体静压力传动原理而发展起来的一门新兴技术,是工农业生产中应用广泛的技术。
2、液压传动的优点
(1)体积小、重量轻,因此惯性力较小,当突然过载或停车时,不会发生大的冲击,
(2)能在给定范围内平稳的自动调节牵引速度,并可实现无极调速;
(3)换向容易,在不改变电机旋转方向的情况下,可以较方便地实现工作机构旋转和直线往复运动的转换;
(4)液压泵和液压马达之间用油管连接,在空间布置上彼此不受严格限制;
(5) 由于采用油液为工作介质,元件相对运动表面间能自行润滑,磨损小,使用寿命长;
(6)操纵控制简便,自动化程度高;
(7)容易实现过载保护。
液压传动有许多突出的优点,因此它的应用非常广泛,如一般工业用的塑料加工机械、压力机械、机床等,行走机械中的工程机械、建筑机械、农业机械、汽车等,钢铁工业用的冶金机械、提升装置、轧辊调整装置等,土木水利工程用的防洪闸门及堤坝装置、河床升降装置、桥粱操纵机构等;发电厂涡轮机调速装置等等,船舶用的甲板起重机械、船头门、舱壁阀、船尾推进器等,特殊技术用的控制装置、测量浮标、升降旋转舞台等。
3、液压传动的基本原理
液压传动的基本原理是在密闭的容器内,利用有压力的油液作为工作介质来实现能量转换和传递动力的。其中的液体称为工作介质,一般为矿物油,它的作用和机械传动中的皮带、链条和齿轮等传动元件相类似。液压传动是利用帕斯卡原理!帕斯卡原理是大概就是:在密闭环境中,向液体施加一个力,这个液体会向各个方向传递这个力!力的大小不变!液压传动就是利用这个物理性质,向一个物体施加一个力,利用帕斯卡原理使这个力变大!从而起到举起重物的效果!
液压传动在阀门行业也得到很大的应用,如阀门的机床制造加工设备、阀门]液压试验设备、阀门的液压传动装置等。