REXROTH氣動(dòng)閥0820059021

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REXROTH氣動(dòng)閥0820059021 力士樂氣動(dòng)閥   氣動(dòng)控制閥的結(jié)構(gòu)特性

氣動(dòng)控制閥的結(jié)構(gòu)可分解成閥體(包含閥座和閥孔等)和閥心兩部分，根據(jù)兩者的相對(duì)位置，有常閉型和常開型兩種。閥從結(jié)構(gòu)上可以分為：截止式、滑柱式和滑板式三類閥。

 

（一）截止式閥的結(jié)構(gòu)及特性

 

截止式閥的閥心沿著閥座的軸向移動(dòng)，控制進(jìn)氣和排氣。圖4.2所示為二通截止式閥的基本結(jié)構(gòu)。圖4.2a中，在閥的P口輸入工作氣壓后，閥芯在彈簧和氣體壓力作用下緊壓在閥座上，壓縮空氣不能從A口流出；圖4.2b為閥桿受到向下的作用力后，閥芯向下移動(dòng)，脫離閥座，壓縮空氣就能從P口流向A口輸出。這就是截止式閥的切換原理。

下離開閥座，壓縮空氣從P口流向A口輸出。圖4.3b為工作狀態(tài)，閥桿在向上的力作用下，閥心緊壓在閥座上關(guān)閉閥口，流道被關(guān)斷，A口沒有壓縮空氣流出。

圖4.4所示為三通截止式閥的結(jié)構(gòu)，閥有P、A、0三個(gè)孔口。圖4.4a為閥的初始狀態(tài)，閥心緊壓在上閥座上，P口和A口通路被關(guān)斷，A口和0口相通。閥的輸出A口沒有輸出。

圖4.4b為工作狀態(tài)。閥桿受力后使閥心離開上閥座而緊壓在下閥座上，關(guān)閉排氣O口，打開P口至A口之間的通道，壓縮空氣從P口流向A口輸出。圖4.4c所示為閥在切換過程中閥心所處的瞬態(tài)位置。此時(shí)，P、A、0三個(gè)孔口同時(shí)相通，而發(fā)生串氣現(xiàn)象。實(shí)際上，對(duì)于快速切換的閥，這種串氣現(xiàn)象對(duì)閥的動(dòng)作不存在什么影響。但緩慢切換時(shí)，應(yīng)予以注意。

截止式閥的結(jié)構(gòu)決定了其開啟所需的時(shí)間較短，但開啟大口徑的閥則需較大的開啟力。因此截止式閥多用于****的閥。需要大流量或高壓時(shí)，往往采取先導(dǎo)式的結(jié)構(gòu)。其方法是增加一個(gè)控制活塞，先導(dǎo)控制氣壓作用在活塞上產(chǎn)生的較大操縱力，以彌補(bǔ)上述缺點(diǎn)。

 

為了使截止式閥密封可靠，操縱方便，另一種方法是采用壓力平衡的方法，如圖4.5所示，在閥桿兩側(cè)增加了活塞，活塞受氣壓作用面積和閥心受壓面積相等，這種閥稱為壓力平衡式閥。由于初始狀態(tài)時(shí)，工作氣壓作用在閥桿上的合力為零，使開啟閥門的操作力大大降低。

（二）滑柱式閥的結(jié)構(gòu)及特性

滑柱式閥是用圓柱狀的閥心在圓筒形閥套內(nèi)沿軸向移動(dòng)，從而切換氣路。圖4.6所示為滑柱式閥的基本結(jié)構(gòu)。圖4.6左圖為閥的初始狀態(tài)，滑柱在彈簧力的作用下右移。此時(shí)，壓縮空氣從輸人口P流向輸出口A，A口有氣壓輸出，B口無(wú)氣壓輸出。圖4.6右圖為閥的工作狀態(tài)；滑柱在操縱力作用下克服彈簧力左移，關(guān)斷P口和A口通路，接通P口和B口。于是，B口有輸出，A口無(wú)輸出。

 

滑柱式閥在結(jié)構(gòu)上只要稍稍改變閥套或滑柱的尺寸、形狀就能實(shí)現(xiàn)兩位四通和兩位五通閥的功能。

4.2

方向控制閥

一、方向控制閥概述

（一）操作方式

 

為了使閥換向，必須對(duì)閥心施加一定大小的軸向力。使其迅速移動(dòng)改變閥心的位置。這種獲得軸向力的方式叫做換向閥的操作方式，或控制方式。通�？煞譃闅鈮�、電磁、人力和機(jī)械四種操作方式。

 

1．氣壓操作

用氣壓力來(lái)獲得軸向力使閥心迅速移動(dòng)換向的操作方式叫做氣壓操作。它按施加壓力的方式可分為加壓控制、卸壓控制、差壓控制和時(shí)間控制。

1)加壓控制是指施加在閥心控制端的壓力逐漸升到一定值時(shí)，使閥心迅速移動(dòng)換向的控制，閥心沿著加壓方向移動(dòng)。

 

2)卸壓控制是指施加在閥心控制端的壓力逐漸降到一定值時(shí)，閥心迅速換向的控制，常用作三位閥的控制。

 

3)差壓控制是指閥心采用氣壓復(fù)位或彈簧復(fù)位的情況下，利用閥心兩端受氣壓作用的面積不等(或兩端氣壓不等)而產(chǎn)生的軸向力之差值，使閥心迅速移動(dòng)換向的控制。其原理如圖4.7所示，K1為控制氣壓口。

圖4.10

延長(zhǎng)法的四種狀態(tài)

ａ）常斷延長(zhǎng)通型�。猓┏Ｍㄑ娱L(zhǎng)斷型

ｃ）常通延長(zhǎng)通型�。洌┏�斷延長(zhǎng)斷型

 

 

這種控制方式只需一個(gè)控制信號(hào)，故得到廣泛的應(yīng)用，可應(yīng)用于各種結(jié)構(gòu)的主閥．。氣壓復(fù)位省去了彈簧，提高了可靠性。差壓控制的特點(diǎn)是所控制的主閥不具有記憶功能，且控制信號(hào)和復(fù)位信號(hào)均須為長(zhǎng)信號(hào)。

 

4)時(shí)間控制是指利用氣流向由氣阻(節(jié)流孔)和氣容構(gòu)成的阻容環(huán)節(jié)充氣，經(jīng)過一定時(shí)間后，當(dāng)氣容內(nèi)壓力升至一定值時(shí)，閥心在差壓力作用下迅速移動(dòng)換向的控制。

 

時(shí)間控制的信號(hào)輸出有脈沖信號(hào)和延長(zhǎng)信號(hào)兩種。圖4.8所示為脈沖閥原理圖，在閥的P口輸入氣壓信號(hào)后，A口即有輸出，同時(shí)氣流經(jīng)節(jié)流孔向氣室充氣，當(dāng)氣容內(nèi)的壓力上升到閥的切換壓力時(shí)，活塞向左移關(guān)斷P—A通路，A口無(wú)輸出，即閥的A口輸出為脈沖信號(hào)。脈沖信號(hào)的寬度決定于節(jié)流孔和氣室的大小。

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110/500820024079 WEGEVENTIL ED 5/2 ISO1 220/500820024080 SOL.-OP.DIR.CONT.V ED 5/2 ISO1 220/500820024081 WEGEVENTIL ED 5/2 ISO1 24V=力士樂Rexroth節(jié)流閥：REXROTH單向力士樂節(jié)流閥、力士樂6通經(jīng) 10通經(jīng)單向節(jié)流閥、力士樂(BOSCH_REXROTH)DR系列單向節(jié)流閥、力士樂(BOSCH-REXROTH)SV系列單向節(jié)流閥、力士樂Rexroth雙單向節(jié)流閥、力士樂REXROTH疊加單向節(jié)流閥、力士樂Rexroth疊式節(jié)流閥、力士樂Rexroth液控節(jié)流閥Z2S系列、力士樂rexroth節(jié)流閥、力士樂單向節(jié)流閥，rexroth單向閥、力士樂單向節(jié)流閥、力士樂帶集成放大器比例節(jié)流閥rexroth、力士樂節(jié)流閥，rexroth節(jié)流閥、力士樂節(jié)流閥、博世力士樂rexroth 二通比例節(jié)流閥、博世力士樂rexroth單向節(jié)流閥、博世力士樂rexroth準(zhǔn)確節(jié)流閥F6型、博世力士樂rexroth節(jié)流閥 單向閥、博世力士樂疊加式節(jié)流閥 兩路節(jié)流單向閥、博世力士樂節(jié)流閥、疊加式雙單向節(jié)流閥、德國(guó)力士樂REXROTH(液壓閥)單向節(jié)流閥、比例節(jié)流閥、節(jié)流和單向節(jié)流閥、力士樂節(jié)流閥力士樂液壓閥：Bosch Rexroth比例閥 齒輪泵、Bosch-Rexroth比例液壓閥、力士樂rexroth電磁閥、力士樂放大板、力士樂電磁換向閥、力士樂電磁溢流閥、博世力士樂rexroth單向節(jié)流閥、博世力士樂rexroth壓力繼電器、博世力士樂rexroth齒輪泵、博世力士樂液壓備件、德國(guó)Bosch Rexroth比例伺服閥、德國(guó)博世力士樂rexroth液壓閥、德國(guó)博世力士樂rexroth電磁閥 柱塞泵 力士樂氣動(dòng)閥  REXROTH氣動(dòng)閥 力士樂氣動(dòng)元件 REXROTH氣動(dòng)元件 力士樂氣動(dòng)產(chǎn)品Rexroth氣動(dòng)產(chǎn)品 力士樂氣動(dòng) REXROTH力士樂 博世力士樂氣動(dòng) BOSCH力士樂氣動(dòng) BOSCH-REXROTH氣動(dòng)力士樂伺服驅(qū)動(dòng)器 力士樂伺服驅(qū)動(dòng) 力士樂變頻器 博世力士樂伺服驅(qū)動(dòng) 博世力士樂變頻器 博世變頻器 BOSCH-REXROTH伺服驅(qū)動(dòng) BOSCH-REXROTH伺服驅(qū)動(dòng)控制器 REXROTH伺服驅(qū)動(dòng)控制器 力士樂伺服電機(jī)  力士樂異步電機(jī) 力士樂三相同步電機(jī) REXROTH伺服電機(jī) REXROTH i/o模塊 力士樂IO模塊 BOSCH-REXROTH伺服電機(jī) REXROTH伺服電機(jī) REXROTH伺服控制 REXROTH PLC模塊 REXROTH工業(yè)PC 力士樂工業(yè)PC 力士樂工業(yè)CPU REXROTH工業(yè)CPU 力士樂數(shù)控系統(tǒng) REXROTH數(shù)控系統(tǒng) 力士樂數(shù)控驅(qū)動(dòng) REXROTH數(shù)控驅(qū)動(dòng) 力士樂驅(qū)動(dòng)系統(tǒng) REXROTH驅(qū)動(dòng)系統(tǒng) 力士樂驅(qū)動(dòng)控制器 REXROTH驅(qū)動(dòng)控制器 博世REXROTH驅(qū)動(dòng)系統(tǒng)