REXROTH二通壓力控制插裝閥蓋板LFA80DB2-63/100X99F35,德國(guó)力士樂邏輯閥蓋板;
力士樂REXROTH二通插裝閥,壓力控制功能
LFA..DB(標(biāo)準(zhǔn))
規(guī)格 16 … 100
*大工作壓力 420 bar
規(guī)格 16 … 100
用于壓力功能的二通插裝閥為先導(dǎo)式座閥或滑閥。設(shè)計(jì)為插裝閥的功率單元安裝在按照 DIN ISO 7368 進(jìn)行標(biāo)準(zhǔn)化的接收孔內(nèi),且使用控制蓋閉合。
用于手動(dòng)或電動(dòng)比例壓力調(diào)節(jié)的先導(dǎo)控制閥作為先導(dǎo)閥集成到控制蓋內(nèi)或安裝在控制蓋上,其安裝尺寸符合 DIN 24 340。
通過(guò)將插裝閥與控制蓋組合,可以實(shí)現(xiàn)不同的壓力功能。
壓力溢流功能
用于壓力溢流功能的插裝閥(型號(hào) LC .DB...)被設(shè)計(jì)為無(wú)面積差的座閥(在油口 B 處無(wú)有效面積)。油口 A 處的有效壓力經(jīng)先導(dǎo)油供油節(jié)流孔導(dǎo)入到元件的彈簧側(cè)。在先導(dǎo)控制閥上設(shè)定的壓力下,閥芯 由彈簧力進(jìn)行壓力補(bǔ)償和閉合。
當(dāng)達(dá)到調(diào)定壓力時(shí),閥芯 開啟,且油口 A 處的壓力將根據(jù)壓力-流體特性而受到限制。
減壓功能
靜止位置開啟
用于減壓功能的插裝閥被設(shè)計(jì)為無(wú)面積差的滑閥(在油口 B 處無(wú)有效面積)。
作為先導(dǎo)控制閥,應(yīng)使用具有壓力溢流功能的相同蓋類型(型號(hào) LFA..DB...)。
油口 A 處的有效壓力經(jīng)先導(dǎo)油供油節(jié)流孔引入到閥芯的彈簧側(cè)。在性能限制和先導(dǎo)控制閥設(shè)定的壓力下,閥芯由彈簧力進(jìn)行壓力補(bǔ)償并保持在開啟位置,以實(shí)現(xiàn)從油口 B 到油口 A 的自由流動(dòng)。
當(dāng)達(dá)到調(diào)定壓力時(shí),閥芯閉合并且油口 A 處的壓力將根據(jù)壓力-流體特性降低。
REXROTH二通壓力控制插裝閥蓋板LFA80DB2-63/100X99F35,購(gòu)買進(jìn)口液壓、氣動(dòng)、自動(dòng)化控制工業(yè)配件,認(rèn)準(zhǔn)“上海韋米機(jī)電設(shè)備有限公司”,保證原裝產(chǎn)品,品質(zhì)保障,售后無(wú)憂,批量零售,價(jià)格優(yōu)惠,常用產(chǎn)品現(xiàn)貨供應(yīng)。歡迎新老客戶咨詢采購(gòu)!
力士樂REXROTH二通插裝閥,壓力控制功能
LFA..DB(高壓)
用于壓力控制功能的控制蓋
用于壓力功能的二通插裝閥為先導(dǎo)式座閥或滑閥。設(shè)計(jì)為插裝閥的功率單元安裝在符合 ISO 7368 標(biāo)準(zhǔn)的接收孔內(nèi),且使用控制蓋閉合。
用于手動(dòng)或電動(dòng)比例壓力調(diào)節(jié)的先導(dǎo)控制閥集成到控制蓋內(nèi)或安裝在控制蓋上。
通過(guò)將插裝閥與控制蓋組合,可以實(shí)現(xiàn)不同的壓力功能。
壓力限制功能
用于限制壓力的插裝閥(型號(hào) LC . DB...)設(shè)計(jì)為無(wú)面積差的座閥(油口 B 處無(wú)有效面積)。油口 A 處的有效壓力經(jīng)先導(dǎo)油供油節(jié)流孔導(dǎo)入到元件的彈簧側(cè)。在先導(dǎo)控制閥設(shè)定的壓力下,閥芯 會(huì)通過(guò)彈簧力進(jìn)行壓力補(bǔ)償并關(guān)閉。當(dāng)達(dá)到調(diào)定壓力時(shí),閥芯 開啟,且油口 A 處的壓力將根據(jù)壓力-流體特性而受到限制。
插裝閥主要組合與功能
1、插裝方向控制閥
插裝閥可以組合成各式方向控制閥。
1)作單向閥
將x腔和A或B腔連通,即成為單向閥。連接方法不同,其導(dǎo)通方式也不同。若在控制蓋板上如圖5c連接一個(gè)二位三通液動(dòng)換向閥,即可組成液控單向閥。
2)
作二位二通閥
二位三通閥,即可組成二位二通電液閥。
3)作二位三通閥
連接二位四通閥,即可組成二位三通電液換向閥。
4)作二位四通閥
連接二位四通閥,即可組成二位四通電液換向閥。
5)作三位四通閥0型換向閥
連接三位四通閥換向閥和單向閥,即可組成三位四通閥中位為0型電液換向閥。
6)作多機(jī)能四通閥
連接換向閥,利用對(duì)電磁換向閥的控制實(shí)現(xiàn)多機(jī)能功能。
2、插裝壓力控制閥
對(duì)插裝閥的x腔進(jìn)行壓力控制,便可構(gòu)成壓力控制閥。
1)作溢流閥或順序閥
在壓力型插裝閥芯的控制蓋板上連接先導(dǎo)調(diào)壓閥(溢流閥) ,當(dāng)出油口接油箱,此閥起溢流閥作用;當(dāng)出油口接另一工作油路,則為順序閥。
2)作卸荷閥
連接二位二通換向閥,當(dāng)電磁鐵通電時(shí),出口接油箱,則構(gòu)成卸荷閥。
3)作減壓閥
采用插裝閥芯和溢流閥連接,則構(gòu)成減壓閥。液壓油P從1流入P2流出,出口油液通過(guò)閥芯上的中心阻尼孔、蓋板和先導(dǎo)閥接通。當(dāng)減壓閥出口的壓力較小,不足以頂開先導(dǎo)閥芯時(shí),主閥芯上的阻尼孔只起通油作用,使主閥芯上、下兩腔的液壓力相等,而上腔又有一個(gè)小彈簧作用,必使主閥芯處在F端極限位置,減壓閥芯大開,不起減壓作用; 當(dāng)壓力增大到先導(dǎo)閥的開啟壓力時(shí),先導(dǎo)閥打開,泄漏油液?jiǎn)为?dú)流回油箱,實(shí)行外泄。減壓閥在調(diào)定壓力下正常工作時(shí),由于出口壓力與先導(dǎo) 閥溢流壓力和主閥芯彈簧力的平衡作用,維持節(jié)流降壓口為某定值。當(dāng)出口壓力增大,由于阻尼孔液流阻力的作用產(chǎn)生壓力降,主閥芯所受的力不平衡,使閥芯上移,減小節(jié)流降壓口,使節(jié)流降壓作用增強(qiáng);反之,出口的壓力減小時(shí),閥芯下移,增大節(jié)流降壓口,使節(jié)流降壓作用減弱,控制出口的壓力維持在調(diào)定值。
3、插裝流量控制閥
插裝流量閥同樣有節(jié)流閥和調(diào)速閥等型式。
1)作節(jié)流閥
在方向控制插裝閥的蓋板上安裝閥芯行程調(diào)節(jié)器,調(diào)節(jié)閥芯和閥體間節(jié)流口的開度便可控制閥口的通流面積,起節(jié)流閥的作用,如圖12a。實(shí)際應(yīng)用時(shí),起節(jié)流閥作用的插裝閥芯一般采用滑閥結(jié)構(gòu),并在閥芯上開節(jié)流溝槽。
2)作調(diào)速閥
插裝式節(jié)流閥同樣具有隨負(fù)載變化流量不穩(wěn)定的問題。如果采取措施保證節(jié)流閥的進(jìn)、出口壓力差恒定,則可實(shí)現(xiàn)調(diào)速閥功能。如圖12b連接的減壓閥和節(jié)流閥就起到這樣的作用。
液壓機(jī)是對(duì)金屬材料塑料、橡膠和粉末冶金制品進(jìn)行壓力加工的設(shè)備,在工業(yè)部門得到了廣泛應(yīng)用,如金屬材料的拉伸、沖裁彎曲翻邊冷擠壓以及成型加工等,還用于校正、壓裝、粉末冶金制品和磨料制品的壓制成型及塑料制品、絕緣材料的壓制成型等。為完成上述工作,液壓機(jī)應(yīng)能產(chǎn)生較大的壓力,因此,液壓系統(tǒng)工作壓力、尺寸和流量也大,對(duì)其設(shè)計(jì)要求也高,是較典型的高壓大流量系統(tǒng)。①液壓系統(tǒng)壓力應(yīng)能經(jīng)常變換和調(diào)節(jié),并能產(chǎn)生較大壓力,以滿足不同的工作要求。②空程速度大、加壓時(shí)推力大,系統(tǒng)功率大,要求功率利用率高。③空程與壓制時(shí),其速度與壓力相差甚大,所以多采用高低壓泵組或恒功率變量泵供油系統(tǒng).以滿足低壓快速行程和高壓慢速行程要求。
力士樂REXROTH插裝閥控制蓋板
力士樂REXROTH插裝閥,壓力作用,插裝閥蓋板LFA..DB
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R901214636 LFA25DB2-7X/315P290V/12
R900928565 LFA25DB2-7X/315V
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R901191685 LFA25DB2-7X/315X00F20
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R900949205 LFA25DB2-7X/315X12F00D08
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R900950712 LFA25DB2-7X/315X12F08/12
R900945991 LFA25DB2-7X/315X12F08D00
R900912764 LFA25DB2-7X/420
R900912764 LFA25DB2-71/420
R901245210 LFA25DB2-7X/420-315
R901051028 LFA25DB2-7X/420/12
R901391587 LFA25DB2-7X/420D08/12
R901178892 LFA25DB2-7X/420D12
R901243685 LFA25DB2-7X/420F15
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R900717653 LFA25DB4-7X/315
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R900947690 LFA25DB2-71/025
R901307149 LFA25DB2-71/025/12
R900929711 LFA25DB2-71/025=LB
R901012473 LFA25DB2-71/025V
R900941129 LFA25DB2-71/025X12
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R900912754 LFA25DB2-71/050
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R900944201 LFA25DB2-71/050V
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R901168175 LFA25DB2-71/315F20
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R901307895 LFA25DB2-71/315P230
R901422762 LFA25DB2-71/315P230F00
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R901214636 LFA25DB2-71/315P290V/12
R900928565 LFA25DB2-71/315V
R983056757 LFA25DB2-71/315VIN010
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R900950712 LFA25DB2-71/315X12F08/12
R900945991 LFA25DB2-71/315X12F08D00
R900912764 LFA25DB2-71/420
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R901243685 LFA25DB2-71/420F15
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R901062264 LFA25DB2-71/420P360F00V/12
R901132136 LFA25DB2-71/420P380
R901174917 LFA25DB2-71/420P385
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R900935963 LFA25DB2-71/420V
R901303253 LFA25DB2-71/420V/12
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R900949725 LFA25DB3-71/025/12
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R900930966 LFA25DB3-71/315
R901272628 LFA25DB3-71/315/12
R901220151 LFA25DB4-71/200
R900717653 LFA25DB4-71/315
R901356620 LFA25DB4-71/420
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R900513507 LFA32DB1-6X/200
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R900434354 LFA32DB1-6X/420
R900760798 LFA32DB1-7X/025
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R901017537 LFA32DB1-7X/050V
R900925229 LFA32DB1-7X/100
R901020983 LFA32DB1-7X/200
R901322412 LFA32DB1-7X/200V
R900974181 LFA32DB1-7X/315
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R901035605 LFA32DB1-7X/315V/12
R901045534 LFA32DB1-7X/420
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R901253346 LFA32DB1-7X/420V
R900905374 LFA32DB2-6X/025
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R900565662 LFA32DB2-6X/050/12
R900518300 LFA32DB2-6X/050F10D06
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R900352240 LFA32DB2-6X/100
R900470807 LFA32DB2-6X/100/12
R900558929 LFA32DB2-6X/100=LB
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R900576584 LFA32DB2-6X/100D15
R900591003 LFA32DB2-6X/100V
R900365651 LFA32DB2-6X/100V/12
R900364697 LFA32DB2-6X/200
R900366791 LFA32DB2-6X/200/12
R900577835 LFA32DB2-6X/200=LB
R900596976 LFA32DB2-6X/200D00
R900549759 LFA32DB2-6X/200D10
R900501786 LFA32DB2-6X/200F15D10
R900549980 LFA32DB2-6X/200F15D12
R900547693 LFA32DB2-6X/200F24D24
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R900484925 LFA32DB2-6X/200V
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R900350266 LFA32DB2-6X/315
R900369923 LFA32DB2-6X/315/12
R900558930 LFA32DB2-6X/315=LB
R900517697 LFA32DB2-6X/315F15
R900436768 LFA32DB2-6X/315V
R900383910 LFA32DB2-6X/315V/12
R900355515 LFA32DB2-6X/420
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R900935399 LFA32DB2-7X/025
R901212548 LFA32DB2-7X/025JV
R901207000 LFA32DB2-7X/025V
R900912763 LFA32DB2-7X/050
R900932662 LFA32DB2-7X/050/12
R900935029 LFA32DB2-7X/050V
R983045569 LFA32DB2-7X/050VIN010
R900963743 LFA32DB2-7X/050V/12
R900912762 LFA32DB2-7X/100
R901264757 LFA32DB2-7X/100-085
R900932372 LFA32DB2-7X/100/12
R901089443 LFA32DB2-7X/100D00
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R900711195 LFA32DB2-7X/100V
R900912770 LFA32DB2-7X/200
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R901074586 LFA32DB2-7X/200D00
R901178654 LFA32DB2-7X/200F10D12
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R900939615 LFA32DB2-7X/200V
R983045568 LFA32DB2-7X/200VIN010
R900912768 LFA32DB2-7X/315
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R900973108 LFA32DB2-7X/315=LB
R901014011 LFA32DB2-7X/315D10
R900958375 LFA32DB2-7X/315F00
R900972856 LFA32DB2-7X/315F00D10
R900246097 LFA32DB2-7X/315F15
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R900912769 LFA32DB2-7X/420
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R901239736 LFA32DB2-7X/420P330V
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R900969018 LFA32DB2-7X/420V
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R901394403 LFA32DB2-7X/450P490
R901437459 LFA32DB2-7X=100
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R900522212 LFA32DB3-6X/050
R900425916 LFA32DB3-6X/100
R900437268 LFA32DB3-6X/200
R900437266 LFA32DB3-6X/200
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R901121661 LFA32DB4-7X/420
R900935399 LFA32DB2-71/025
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R900963743 LFA32DB2-71/050V/12
R900912762 LFA32DB2-71/100
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R900932372 LFA32DB2-71/100/12
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R900912768 LFA32DB2-71/315
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R900973108 LFA32DB2-71/315=LB
R901014011 LFA32DB2-71/315D10
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R900246097 LFA32DB2-71/315F15
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R901162917 LFA32DB2-71/315F20D00
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R900912769 LFA32DB2-71/420
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R901237887 LFA32DB2-71/420-350
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R901073082 LFA32DB2-71/420D00
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R901174918 LFA32DB2-71/420P385
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R901394403 LFA32DB2-71/450P490
R901437459 LFA32DB2-71=100
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R900966753 LFA32DB3-71/025
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R901109328 LFA32DB3-71/100
R901241375 LFA32DB3-71/200
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R900617040 LFA32DB4-71/315
R901121661 LFA32DB4-71/420
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R900519324 LFA40DB2-6X/100/12
R900558942 LFA40DB2-6X/100=LB
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R900969066 LFA40DB2-7X/315D08
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R900429844 LFA40DB3-6X/050
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R900358039 LFA40DB3-6X/315
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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(guò)程中所產(chǎn)生的工作空間容積變化來(lái)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(lái)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,而封閉腔容積的增大又造成局部真空,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(guò)左邊的卸荷槽與壓油腔相通,容積增大時(shí)通過(guò)右邊的卸荷槽與吸油腔相通。
1.3葉片泵
葉片泵即通過(guò)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(lái)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。
液壓執(zhí)行元件
將液壓能轉(zhuǎn)換為機(jī)械能的裝置,其作用是在壓力油的推動(dòng)下輸出力和速度或轉(zhuǎn)矩和速度,以驅(qū)動(dòng)工作裝置做工。例如液壓缸、液壓馬達(dá)。
2.1液壓馬達(dá)
液壓馬達(dá)習(xí)慣上是指輸出旋轉(zhuǎn)運(yùn)動(dòng)的,將液壓泵提供的液壓能轉(zhuǎn)變?yōu)闄C(jī)械能的能量轉(zhuǎn)換裝置。
液壓馬達(dá)亦稱為油馬達(dá),主要應(yīng)用于注塑機(jī)械、船舶、起揚(yáng)機(jī)、工程機(jī)械、建筑機(jī)械、煤礦機(jī)械、礦山機(jī)械、冶金機(jī)械、船舶機(jī)械、石油化工、港口機(jī)械等。
高速馬達(dá)齒輪馬達(dá)具有體積小、重量輕、結(jié)構(gòu)簡(jiǎn)單、工藝性好、對(duì)油液的污染不敏感、耐沖擊和慣性小等優(yōu)點(diǎn)。缺點(diǎn)有扭矩脈動(dòng)較大、效率較低、起動(dòng)扭矩較小(僅為額定扭矩的60%-一70%)和低速穩(wěn)定性差等。
2.2液壓缸
液壓缸是將液壓能轉(zhuǎn)變?yōu)闄C(jī)械能的、做直線往復(fù)運(yùn)動(dòng)(或擺動(dòng)運(yùn)動(dòng))的液壓執(zhí)行元件。它結(jié)構(gòu)簡(jiǎn)單、工作可靠。用它來(lái)實(shí)現(xiàn)往復(fù)運(yùn)動(dòng)時(shí),可免去減速裝置,并且沒有傳動(dòng)間隙,運(yùn)動(dòng)平穩(wěn),因此在各種機(jī)械的液壓系統(tǒng)中得到廣泛應(yīng)用。液壓缸輸出力和活塞有效面積及其兩邊的壓差成正比;液壓缸基本上由缸筒和缸蓋、活塞和活塞桿、密封裝置、緩神裝置與排氣裝置組成。緩神裝置與排氣裝置視具體應(yīng)用場(chǎng)合而定,其他裝置則。
3.3液壓控制調(diào)節(jié)元件
用來(lái)控制液壓傳動(dòng)系統(tǒng)中油液的流動(dòng)方向、壓力和流量,以保證液壓執(zhí)行元件和工作裝置完成工作。
液壓傳動(dòng)中用來(lái)控制液體壓力、流量和方向的元件。其中控制壓力的稱為壓力控制閥,控制流量的稱為流量控制閥,控制通、斷和流向的稱為方向控制閥。
3.4液壓輔助元件
保證液壓傳動(dòng)系統(tǒng)正常工作。例如油箱、油管、濾油器。
液壓輔件是系統(tǒng)的一一個(gè)重要組成部分,其合理設(shè)計(jì)和選用在很大程度上影響液壓系統(tǒng)的效率、噪聲、溫升、工作可靠性等技術(shù)性能。主要包括:
3.4.1過(guò)濾器
過(guò)濾器的作用:濾去油中雜質(zhì),維護(hù)油液清潔,防止油液污染,保證系統(tǒng)正常工作。
3.4.2蓄能器
蓄能器的作用:
蓄能器是液壓系統(tǒng)中儲(chǔ)存和釋放壓力能的裝置。
1.作輔助動(dòng)力源或緊急動(dòng)力源在工作循環(huán)不同階段需要的流量變化很大時(shí),常采用蓄能器和一個(gè)流量較小的泵組成油源。另外當(dāng)驅(qū)動(dòng)泵的原動(dòng)機(jī)發(fā)生故障時(shí),蓄能器可作緊急動(dòng)力源。
2.保壓和補(bǔ)充泄漏需要較長(zhǎng)時(shí)間保壓而泵卸載時(shí),可利用蓄能器釋放儲(chǔ)存的壓力油,補(bǔ)充系統(tǒng)泄漏,保持系統(tǒng)壓力。
3.吸收沖擊和消除壓力脈動(dòng)在壓力沖擊處和泵的出口安裝蓄能器可吸收壓力沖擊峰值和壓力脈動(dòng),提高系統(tǒng)工作的平穩(wěn)性。
3.4.3油箱
油箱是液壓系統(tǒng)中儲(chǔ)存液壓油用。
油箱的功用:
儲(chǔ)存系統(tǒng)所需的足夠油液;;
散發(fā)油液中的熱量;
逸出溶解在油液中的空氣; :
沉淀油液中的污物;
對(duì)中小型液壓系統(tǒng),泵裝置及一些液壓元件還安裝在油箱頂板上。
3.4.4熱交換器
系統(tǒng)能量損失轉(zhuǎn)換為熱量以后,會(huì)使油液溫度升高。若長(zhǎng)時(shí)間油溫過(guò)高,油液粘度下降,泄漏增加,密封老化,油液氧化,嚴(yán)重影響系統(tǒng)正常工作。為保證正常工作溫度在20~65C,需要在系統(tǒng)中安裝冷卻器。相反,油溫過(guò)低,油液粘度過(guò)大,設(shè)備啟動(dòng)困難,壓力損失加大并引起過(guò)大的振動(dòng)。此種情況下系統(tǒng)應(yīng)安裝加熱器,將油液溫度升高到適合的溫度。
3.4.5管件
管件是用來(lái)連接液壓元件、輸送液壓油液的連接件。它應(yīng)保證有足夠的強(qiáng)度,沒有泄漏,密封性能好,壓力損失小,拆裝方便。
3.4.6密封裝置
密封裝置用來(lái)防止系統(tǒng)油液的內(nèi)外泄漏,以及外界灰塵和異物的侵入,保證系統(tǒng)建立必要壓力。
3.5液壓工作介質(zhì)
工作介質(zhì)指?jìng)鲃?dòng)液體,通常被稱為液壓油。
3.5.1液壓油
液壓油引就是利用液體壓力能的液壓系統(tǒng)使用的液壓介質(zhì),在液壓系統(tǒng)中起著能量傳遞、系統(tǒng)潤(rùn)滑、防腐、防銹、冷卻等作用。對(duì)于液壓油來(lái)說(shuō),首先應(yīng)滿足液壓裝置在工作溫度下與啟動(dòng)溫度下對(duì)液體粘度的要求,由于油的粘度變化直接與液壓動(dòng)作、傳遞效率和傳遞精度有關(guān),還要求油的粘溫性能和剪切安定性應(yīng)滿足不同用途所提出的各種需求。
3.5.2液壓油的要求
質(zhì)量要求:
1.合適的粘 度和良好的粘溫性能,以保證液壓元件在工作壓力和工作溫度發(fā)生變化的條件下得到良好潤(rùn)滑、冷卻和密封。
2.良好的極壓抗磨性, 以保證油泵、液壓馬達(dá)、控制閥和油缸中的摩擦副在高壓、高速苛刻條件下得到正常的潤(rùn)滑,減少磨損。
3.優(yōu)良的抗氧化安定性、水解安定性和熱穩(wěn)定性,以抵抗空氣、水分和高溫、高壓等因素的影響或作用,使其不易老化變質(zhì),延長(zhǎng)使用壽命。
4.良好的抗泡性 和空氣釋放值,以保證在運(yùn)轉(zhuǎn)中受到機(jī)械劇烈攪拌的條件下產(chǎn)生的泡沫能迅速消失:并能將混入油中的空氣在較短時(shí)間內(nèi)釋放出來(lái),以實(shí)現(xiàn)準(zhǔn)確、靈敏、平穩(wěn)地傳遞靜壓。
5.良好的抗乳化性, 能與混入油中的水分迅速分離,以免形成乳化液,引起液壓系統(tǒng)的金屬材質(zhì)銹蝕和降低使用性能。
6.良好的防銹性,以防止金屬表面銹蝕。
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