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方向控制閥

類型:單向閥、換向閥

一、單向閥

類型:普通單向閥、液控單向閥

1、普通單向閥

作用:只允許油液沿一個(gè)方向流動(dòng)，不允許油液反向倒流(起止回作用)

對(duì)單向閥的性能要求:

(1) 正向?qū)�通時(shí)，壓力損失要小;

(2)反向截止時(shí)，密封性要好。

2、

液控單向閥

作用:

(1)起止回作用;

(2)必要時(shí)解除逆止，允許油液反向通過(guò)。

3、單向閥用途

(1)止回作用:安裝在泵的出口，p.=0.3~0.5 bar

(2)作背壓閥用:防止液壓缸前沖或爬行，使系統(tǒng)作平穩(wěn)。

(3)作鎖緊裝置用:起重機(jī)支腿、夾緊回路等。

(4)保持控制油路有必要的壓力: Pr≥P液挖

(5)作復(fù)合閥使用:單向節(jié)流閥、單向順序閥、單向減壓閥、單向調(diào)速閥等。

(6)局部回路作安全閥使用: Ppr>P換熱器正常工作的距力

二、換向閥

作用:

利用閥芯相對(duì)于閥體間的相對(duì)位置改變，使油路接通、關(guān)斷，或改變油流的方向，從而使液壓執(zhí)行元件啟動(dòng)、停止或變換運(yùn)動(dòng)方向。

1、對(duì)換向閥的性能要求

(1)油液導(dǎo)通時(shí)壓力損失要小;

(2)油液斷開(kāi)時(shí)泄漏要小;

(3)閥芯換位時(shí)操縱力要小。

2、類型

按閥芯的形狀分類滑閥{包括控制部分、主體部分(位、通)}、轉(zhuǎn)閥

按閥的安裝方式分類:管式、板式、法蘭式。

按操縱方式分類: 

手動(dòng)、機(jī)動(dòng)、電動(dòng)、彈簧控制、液動(dòng)、液壓先導(dǎo)控制、電液動(dòng)等。

3、換向閥主體結(jié)構(gòu)與工作原理

幾種典型換向閥的結(jié)構(gòu)

1、手動(dòng)換向閥

2、機(jī)動(dòng)換向閥，又稱行程閥。

它是借助于安裝在工作臺(tái)上的擋鐵或凸輪來(lái)迫使閥芯移動(dòng)。通常是二位的，有二通、三通、四通和五通幾種，其中二位二通機(jī)動(dòng)閥又分常閉和常開(kāi)兩種。

③電磁換向閥

工作原理:

利用電磁鐵的通電吸合與斷電釋放而直接推動(dòng)閥芯來(lái)控制液流方向的。

類型:

交流(D,36V或220V或380V)

直流(E,24V或100V )

干式、濕式

交流電磁鐵:使用電壓為交流110、220、380V。特點(diǎn)是啟動(dòng)力較大，不需要專門的電源，吸合、釋放快，動(dòng)作時(shí)間約為0.01 ~0.03s。缺點(diǎn)是電源電壓下降15%以上，電磁鐵吸力明顯減小，若銜鐵不動(dòng)作，干式電磁鐵會(huì)在10~15min (濕式1~1.5h) 后燒壞線圈，且沖擊及噪聲較大，壽命低，允許切換頻率為10次1分。

直流電磁鐵:使用電壓為直流110和24V,工作可靠，吸合釋放時(shí)間約為0.05~ 0.08s,切換頻率般為120次/分，沖擊小、體積小、壽命長(zhǎng)，但需要專門的直流電源，成本較高。

交流本整型電磁鐵:電磁鐵是直流的，電磁鐵本身帶整流器，通入交流電經(jīng)整流后再供給直流電磁鐵。

干式電磁鐵:電磁鐵線圈、鐵芯與軛鐵處于空氣中而不和油液接觸。電磁鐵與閥連接時(shí)，在推桿處設(shè)置密封圈，避免了油液進(jìn)入電磁鐵，而且裝拆方便。為了防止回油進(jìn)入干式電磁鐵中，要求換向閥的回油壓力不能太高。

濕式電磁鐵:濕式電磁鐵的推桿與閥芯連成一體,取消了推桿處的動(dòng)密封，所以摩擦力小，復(fù)位性能好，冷卻潤(rùn)滑好，工作壽命長(zhǎng)。

特點(diǎn):

(1)動(dòng)作迅速，操作輕便，便于遠(yuǎn)距離控制;

(2)因受電磁鐵尺寸與推力的限制，僅能控制小流量(小于63 L (min)的液流;

(3)電磁鐵通斷電需電信號(hào)控制:如設(shè)備中的按鈕開(kāi)關(guān)、限位開(kāi)關(guān)、行程開(kāi)關(guān)等; 

(4)換向快，易產(chǎn)生液壓沖擊。

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液壓傳動(dòng)技術(shù)在機(jī)械中的應(yīng)用.

驅(qū)動(dòng)機(jī)械運(yùn)動(dòng)的機(jī)構(gòu)以及各種傳動(dòng)和操縱裝置有多中形式。根據(jù)所用的不見(jiàn)和零件，可分為機(jī)械的、電氣的、氣動(dòng)的、液壓的傳動(dòng)裝置。經(jīng)常還將不同的形式組合起來(lái)運(yùn)用一四位一體。由于液壓傳動(dòng)具有很多優(yōu)點(diǎn)，使這種新技術(shù)發(fā)展的很快。液壓傳動(dòng)應(yīng)用與金屬切割機(jī)床也不過(guò)四五十年的歷史。航空工業(yè)在1930年以后才開(kāi)始采用。特別是最近二三十年一來(lái)液壓技術(shù)在各種工業(yè)中的應(yīng)用越來(lái)越廣泛。

1、在機(jī)床上，液壓傳動(dòng)常應(yīng)用在以下的- -些裝置中

1.1進(jìn)給 傳動(dòng)裝置磨床砂輪架和工作臺(tái)的進(jìn)給運(yùn)動(dòng)大部分采用液壓傳動(dòng);車床、六角車床、自動(dòng)車床的刀架或轉(zhuǎn)塔刀架，銑床、刨床、組合機(jī)床的工作臺(tái)等的進(jìn)給運(yùn)動(dòng)也都采用液壓傳動(dòng)。這些部件有的要求快速移動(dòng)，有的要求慢速移動(dòng)。有的既要求快速移動(dòng)，也要求慢速移動(dòng)。這些運(yùn)動(dòng)多半要求有較大的調(diào)速范圍，要求在工作中無(wú)級(jí)調(diào)速;有的要求持續(xù)進(jìn)給，有的要求間歇進(jìn)給;有的要求在負(fù)載變化下速度恒定，有的要求有良好的換向性能等等。所有這些要求都是可以用液壓傳動(dòng)來(lái)實(shí)現(xiàn)的。

1.2往復(fù)主題運(yùn)動(dòng)傳動(dòng)裝置龍i刨床的工作臺(tái)、牛頭刨床或插床的滑枕，由于要求作高速往復(fù)直線運(yùn)動(dòng)并且要求換向沖擊小、換向時(shí)間短、能耗低，因此都可以采用液壓傳動(dòng)。

1.3仿形裝置車床、銑床、刨床上的仿形加工可以采用液壓伺服系統(tǒng)來(lái)完成。起精度可達(dá)0.01-0. 02m。此外，磨床上的成型砂輪修正裝置亦可采用這系統(tǒng)。

1.4 輔助裝置機(jī)床上的夾緊裝置、齒輪箱變速操縱裝置、絲桿螺母間隙消除裝置、垂直移動(dòng)部件平衡裝置、分度裝置、工件和刀具裝卸裝置、工件輸送裝置等，采用液壓傳動(dòng)，有利于簡(jiǎn)化機(jī)床結(jié)構(gòu)，提高機(jī)床自動(dòng)化程度。

1.5靜壓支承重型機(jī)床、高速機(jī)床、高精度機(jī)床上的軸承、導(dǎo)軌、絲桿螺母機(jī)構(gòu)等處采用液壓靜支承后，可以提高工作平穩(wěn)性和運(yùn)動(dòng)精度。

2、液壓傳動(dòng)技術(shù)在工程機(jī)械行走驅(qū)動(dòng)中的應(yīng)用

行走驅(qū)動(dòng)系統(tǒng)是工程機(jī)械的重要組成部分。與工作系統(tǒng)相比，行走驅(qū)動(dòng)系統(tǒng)不僅需要傳輸更大的功率，要求器件具有更高的效率和更長(zhǎng)的壽命，還希望在變速調(diào)速、差速、改變輸出軸旋轉(zhuǎn)方向及反向傳輸動(dòng)力等方面具有良好的能力。于是，采用何種傳動(dòng)方式，如何更好地滿足各種工程機(jī)械行走驅(qū)動(dòng)的需要，-直是工程機(jī)械行業(yè)所要面對(duì)的課題。尤其是近年來(lái)，隨著我國(guó)交通、能源等基礎(chǔ)設(shè)施建設(shè)進(jìn)程的快速發(fā)展，建筑施工和資源開(kāi)發(fā)規(guī)模不斷擴(kuò)大，工程機(jī)械在市場(chǎng)需求大大增強(qiáng)的同時(shí)，更面臨著作業(yè)環(huán)境更為苛刻、工沉條件更為復(fù)雜等所帶來(lái)的挑戰(zhàn)，也進(jìn)一步推動(dòng)著對(duì)其行走驅(qū)動(dòng)系統(tǒng)的深入研究。

力士樂(lè)REXROTH液壓元件應(yīng)用行業(yè)：注塑機(jī)、吹塑機(jī)、橡膠和發(fā)泡機(jī)、陶瓷壓機(jī)、同步折彎?rùn)C(jī)(折板機(jī)),、剪板機(jī)(剪床）、沖切/步?jīng)_、金屬壓力機(jī)、彎曲/鋸床、機(jī)床、食品機(jī)械、皮革/鞋機(jī)、木材/造紙機(jī)械、鋼鐵業(yè)/鑄造、壓鑄機(jī)/擠壓機(jī)、電廠、生態(tài)能源（風(fēng)能-水力-太陽(yáng)能）設(shè)備、油和天然氣工業(yè)設(shè)備、混凝土泵、路機(jī)、鉆井/開(kāi)采設(shè)備、起重機(jī)、升降機(jī)/叉車、推土機(jī)、道路，隧道，水壩工程設(shè)備、壓縮機(jī)、街道維修設(shè)備、模擬器/娛樂(lè)設(shè)備、卡車、鐵路工程設(shè)備、航空工業(yè)設(shè)備、船舶/航海工業(yè)設(shè)備、打谷機(jī)/噴灑機(jī)、拖拉機(jī)/收割機(jī)。