VT-SWA-1-12/DFEE力士樂擺角傳感器

VT-SWA-1-12/DFEE力士樂擺角傳感器，德國(guó)REXROTH擺角傳感器，現(xiàn)貨庫(kù)存，武漢百士自動(dòng)化設(shè)備有限公司主營(yíng)銷售產(chǎn)品，原裝產(chǎn)品，客戶買的安心，用的放心。價(jià)格優(yōu)惠，常用產(chǎn)品現(xiàn)貨供應(yīng)，歡迎新老客戶詢價(jià)采購(gòu)！

液壓傳動(dòng)系統(tǒng)的組成

1、液壓動(dòng)力原件

將動(dòng)力裝置的機(jī)械能轉(zhuǎn)換成為液壓能的裝置，其作用是為液壓傳動(dòng)系統(tǒng)提供壓力油,是液壓傳動(dòng)系統(tǒng)的動(dòng)力源。例如液壓泵。

1.1液壓泵

液壓泵是液壓系統(tǒng)的動(dòng)力元件，其作用是將原動(dòng)機(jī)的機(jī)械能轉(zhuǎn)換成液體的壓力能,指液壓系統(tǒng)中的油泵，它向整個(gè)液壓系統(tǒng)提供動(dòng)力。液壓泵的結(jié)構(gòu)形式一般有齒輪泵、葉片泵和柱塞泵。

1.2齒輪泵

齒輪泵即依靠密封在個(gè)殼體中的兩個(gè)或兩個(gè)以上齒輪,在相互嚙合過程中所產(chǎn)生的工作空間容積變化來輸送液體的泵。齒輪泵的概念是很簡(jiǎn)單的，即它的基本形式就是兩個(gè)尺寸相同的齒輪在一個(gè)緊密配合的殼體內(nèi)相互嚙合旋轉(zhuǎn)，這個(gè)殼體的內(nèi)部類似“8”字形，兩個(gè)齒輪裝在里面,齒輪的外徑及兩側(cè)與殼體緊密配合。來自于擠出機(jī)的物料在吸入口進(jìn)入兩個(gè)齒輪中間，并充滿這一空間，隨著齒的旋轉(zhuǎn)沿殼體運(yùn)動(dòng)，后在兩齒嚙合時(shí)排出。困油現(xiàn)象齒輪泵要平穩(wěn)工作，齒輪嚙合的重合度必須大于1, 于是總有兩對(duì)齒輪同時(shí)嚙合, :并有一部分油液被圍困在兩對(duì)輪齒所圍成的封閉容腔之間。這個(gè)封閉的容腔開始隨著

齒輪的轉(zhuǎn)動(dòng)逐漸減小，以后又逐漸加大。封閉腔容積的減小會(huì)使被困油液受擠壓而產(chǎn)生很高的壓力，并且從縫隙中擠出，導(dǎo)致油液發(fā)熱，并致使機(jī)件受到額外的負(fù)載，而封閉腔容積的加大又造成局部真空，使油液中溶解的氣體分離，產(chǎn)生氣穴現(xiàn)象。這些都將產(chǎn)生強(qiáng)烈的振動(dòng)和噪音，這就是齒輪泵的困意現(xiàn)象。

危害：徑向不平衡力很大時(shí)能使軸彎曲，齒頂與殼體接觸，同時(shí)加速軸承的磨損，降低軸承的壽命。

消除困油現(xiàn)象方法:通常是在兩側(cè)蓋板上開卸荷槽，使封閉腔容積誠(chéng)小時(shí)通過左邊的卸荷槽與壓油腔相通，容積加大時(shí)通過右邊的卸荷槽與吸油腔相通。

1.3葉片泵

葉片泵即通過葉輪的旋轉(zhuǎn)，將動(dòng)力機(jī)的機(jī)械能轉(zhuǎn)換為水能(勢(shì)能、動(dòng)能、壓能)的水力機(jī)械。

葉片泵轉(zhuǎn)子旋轉(zhuǎn)時(shí)，葉片在離心力和壓力油的作用下，尖部緊貼在定子內(nèi)表面上。這樣兩個(gè)葉片與轉(zhuǎn)子和定子內(nèi)表面所構(gòu)成的工作容積，先由小到大吸油后再由大到小排油，葉片旋轉(zhuǎn)一周時(shí)，完成兩次吸油與排油。

1.4柱塞泵

柱塞泵即利用柱塞在泵缸體內(nèi)往復(fù)運(yùn)動(dòng)，使柱塞與泵壁間形成容積改變，反復(fù)吸入和排;出液體并增高其壓力的泵。

柱塞泵是液壓系統(tǒng)的一個(gè)重要裝置。它依靠柱塞在缸體中往復(fù)運(yùn)動(dòng)，使密封工作容腔的容積發(fā)生變化來實(shí)現(xiàn)吸油、壓油。柱塞泵具有額定壓力高、結(jié)構(gòu)緊湊、效率高和流量調(diào)節(jié)方便等優(yōu)點(diǎn)，被廣泛應(yīng)用于高壓、大流量和流量需要調(diào)節(jié)的場(chǎng)合，諸如液壓機(jī)、工程機(jī)械和船舶中。

液壓伺服控制系統(tǒng)

以伺服控制元件完成動(dòng)力與運(yùn)動(dòng)方向控制，綜合壓力、流量、方向控制為一體，利用偏差控制進(jìn)行糾偏，以滿足精度控制需要，必須為閉環(huán)控制，可實(shí)現(xiàn)較高頻率( 100HZ以上) ,有滑閥式、噴嘴擋板式、射流管式等，常采用機(jī)械伺服、電液伺服、氣液伺服。

 

液壓伺服系統(tǒng)分類:

(1)按輸入的信號(hào)變化規(guī)律分類:定值控制系統(tǒng)、程序控制系統(tǒng)和伺服系統(tǒng)三類。當(dāng)系統(tǒng)輸入信號(hào)為定值時(shí)，稱為定值控制系統(tǒng)，其基本任務(wù)是提高系統(tǒng)的抗干擾能力。當(dāng)系統(tǒng)的輸入信號(hào)按預(yù)先給定的規(guī)律變化時(shí)，稱為程序控制系統(tǒng)。伺服系統(tǒng)也稱為隨動(dòng)系統(tǒng)，其輸入信號(hào)是時(shí)間的未知函數(shù)，輸出量能夠準(zhǔn)確、迅速地復(fù)現(xiàn)輸入量的變化規(guī)律。

(2)按輸入信號(hào)的不同分類:機(jī)液伺服系統(tǒng)、電液伺服系統(tǒng)、氣液伺服系統(tǒng)等。

(3)按輸出的物理量分類:位置伺服系統(tǒng)、速度伺服系統(tǒng)、力(或壓力)伺服系統(tǒng)等。

(4)按控制元件分類:閥控系統(tǒng)和泵控系統(tǒng)。在機(jī)械設(shè)備中，閥控系統(tǒng)應(yīng)用較多。

 

 

液壓伺服系統(tǒng)的特點(diǎn)如下:

(1)反饋。把輸出量的一部分或全部按一定方式回送到輸入端，并和輸入信號(hào)進(jìn)行比較，這就是反饋。在上例中，反饋(檢測(cè)時(shí)速裝置輸出)電壓和給定(輸入信號(hào))電壓是異號(hào)的，即反饋信號(hào)不斷地抵消輸入信號(hào)，這是負(fù)反饋。自動(dòng)控制系統(tǒng)大多數(shù)是負(fù)反饋。

(2)偏差。要使液壓缸輸出一定的力和速度，伺服閥必須有一定的開口量，因此輸入和輸出之間必須有偏差信號(hào)。液壓缸運(yùn)動(dòng)的結(jié)果又力圖消除這個(gè)誤差。但在伺服系統(tǒng)工作的任何時(shí)刻都不能完全消除這一-偏差，伺服系統(tǒng)正是依靠這一-偏差信號(hào)進(jìn)行工作的。

(3)放大。執(zhí)行元件(液壓缸)輸出的力和功率遠(yuǎn)遠(yuǎn)大于輸入信號(hào)的力和功率，其輸出的能量是液壓能源供給的。

(4)跟進(jìn)。液壓缸的輸出量完全跟進(jìn)輸入信號(hào)的變化。

VT-SWA-1-12/DFEE力士樂擺角傳感器

力士樂REXROTHA10VSO軸向柱塞泵SYDFE控制系統(tǒng)擺角傳感器、旋轉(zhuǎn)角度傳感器

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力士樂REXROTH電動(dòng)液壓控制系統(tǒng)

零配件

力士樂REXROTH帶電氣位置反饋直動(dòng)式三位三通比例方向閥作為SYDFE控制系統(tǒng)的先導(dǎo)閥

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