SV20PA2-4X

SV20PA2-4X

发布商家
武汉百士自动化设备有限公司
联系人
雷青(先生)
职位
业务经理
电话
027-87680708-606
手机
15307180902
供应
100个
规格参数:
型号 :SV20PA2-4X品牌 :力士乐REXROTH
加工定制 :规格 :SV20PA2-4X

SV20PA2-4X REXROTH液控单向阀,武汉百士自动化设备有限公司供应产品,现货库存,原厂原装,质量保障,价格优惠;移动电话:15307180902,商务QQ:980227448,传真:027-87680708-608,联系人:雷青;欢迎新老客户咨询购买!

液动换向阀

工作原理:

利用控制油路的油液压力来改变阀芯位置的换向阀。

特点:

(1) 换向速度易于控制,结构简单、动作平稳可靠;

(2)由于液压驱动力大,适用于大流量的场合;

(3)其控制油路必须有开关或换向装置。

⑤电液动换向阀

组成

电磁阀:电磁阀负责液动阀控制油路的换向,起先导作用。

液动阀:负责主油路的换向。

特点:

(1)换向平稳无冲击;

(2)允许通过的流量大。

 

4、换向阀的滑阀机能

常态位:

换向阀的阀芯未受到外部操纵力作用时所处的位置。

滑阀机能:

阀芯处于常态位(原始位置)时各油口的连通方式。如二位阀有“常通型”、常断型

中位机能:三位换向阀的阀芯在中间位置时,各油口的连通方式,称为换向阀的中位机能。

 

压力控制阀

作用:

用来控制液压传动系统中油液的压力,以满足执行元件所要求的力和转矩。

类型:

溢流阀、减压阀、顺序阀、压力继电器等。

共同点:

利用作用在阀芯上的液压力和弹簧力相平衡的原理工作。

 

溢流阀

类型:直动式、先导式

作用:

(1)在不断溢流过程中保持系统压力恒定,起稳压和溢流作用(p,FP

系统’阀口常开) ;

(2)防止液压系统过载,起安全保护作用(p,=1.1~1.2p,max,阀口常闭)

(一)溢流阀的基本结构及其工作原理

1、直动式溢流阀

工作原理:

直接利用液压力与弹簧力相平衡以控制阀芯的启闭动作,从而保证进油口压力基本恒定。

特点:

①阀芯所受的液压力全靠弹簧力平衡,故当系统压力很高时,弹簧必须很硬,导致结构笨重,调压不轻便。一般用于压力小于2.5MPa的低压系统中,作安全阀或背压阀使用。

②由于惯性或负载的变化,导致q、变化,即开口度h的变化,由于k很大,所以p不稳定,稳压精度差;

③结构简单、便宜,但工作时易产生振动和噪音。

 

2、

先导式溢流阀

结构:先导调压部分:控制主阀的溢流压力;主阀部分:溢流

工作原理:

利用主阀芯上下两端液体压力差与弹簧力相平衡的原理来进行压力控制。

特点:

①因为锥阀作用面积很小,即使压力很高,弹簧刚度仍不大,调压轻便;

②因为主阀弹簧很软,因此溢流量变化时,压力波动小。静态特性好;

③能适应各种不同的调压范围的要求;

④主阀芯采用锥面阀座式结构密封,没有搭合量,动作灵敏。

SV20PA2-4X REXROTH液控单向阀

力士乐液控单向阀SV 10...32

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液压控制连铸机

液压振动控制系统通过连续600万次振动测试,测试数据结果完全符合实际生产需求,且设备完好无损。由于博世力士乐液压油缸采用密封结构设计,因而不仅不会产生任何泄漏,密封的寿命也大大提高,使得系统运行成本远低于机械式振动系统。结晶器壁对运动坯壳的摩擦力被认为是撕裂坯壳进而限制浇铸速度的基本因素。在初生坯壳与结晶器壁之间存在一液体渣膜,此处的摩擦为粘滞摩擦,即摩擦力大小正比于相对运动速度,渣膜粘度,反比于渣膜厚度。这样在结晶器振动正滑脱期间这一摩擦力及其引起的对坯壳的拉应力就较大,可能将初生坯壳拉裂,为此开发了非正弦振动技术来减小这一摩擦力。

 

起重机是指在一定范围内垂直提升和水平搬运重物的多动作起重机械。又称天车,航吊,吊车。

轮胎起重机的主要特点是:其行驶驾驶室与起重操纵室合二为一、是由履带起重机(履带吊)演变而成,将行走机构的履带和行走支架部分变成有轮胎的底盘,克服了履带起重机(履带吊)履带板对路面造成破坏的缺点,属于物料搬运机械。

桥式起重机是横架于车间、仓库和料场上空进行物料吊运的起重设备。由于它的两端坐落在高大的水泥柱或者金属支架上,形状似桥。桥式起重机的桥架沿铺设在两侧高架上的轨道纵向运行,可以充分利用桥架下面的空间吊运物料,不受地面设备的阻碍。它是使用范围广、数量多的一种起重机械。

 

起重设备有的工作特点是做间歇性运动,即在一个工作循环中取料、运移、卸载等动作的相应机构是交替工作的,起重机在市场上的发展和使用越来越广泛。由于不用支腿吊重及吊重行驶经常出现一些事故,行驶的速度也较履带起重机(履带吊)快;作业稳定、起重量大、可在特定范围内吊重行走、但必须保证道路平整坚实、轮胎气压符合要求、吊离地面不得超过50CM;禁止带负荷长距离行走。为保证作业安全,目前国内基本上禁止不打支腿进行吊装作业。起重机配套使用钢丝绳品种包括磷化涂层钢丝绳、镀锌钢丝绳和光面钢丝绳。

人气
112
发布时间
2020-08-12 11:59
所属行业
单向阀
编号
12929461
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