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止回閥是指依靠介質本身流動而自動開、閉閥瓣,用來防止介質倒流的閥門,又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥屬于一種自動閥門,其主要作用是防止介質倒流、防止泵及驅動電動機反轉,以及容器介質的泄放。
工作原理
止回閥還可用于給其中的壓力可能升至超過系統壓的輔助系統提供補給的管路上。止回閥主要可分為旋啟式止回閥(依重心旋轉)與升降式止回閥(沿軸線移動)。
止回閥這種類型的閥門的作用是只允許介質向一個方向流動,而且阻止反方向流動。通常這種閥門是自動工作的,在一個方向流動的流體壓力作用下,閥瓣打開;流體反方向流動時,由流體壓力和閥瓣的自重合閥瓣作用于閥座,從而切斷流動。
其中止回閥就屬于這種類型的閥門,它包括旋啟式止回閥和升降式止回閥。旋啟式止回閥有一介鉸鏈機構,還有一個像門一樣的閥瓣自由地靠在傾斜的閥座表面上。為了確保閥瓣每次都能到達閥座面的合適位置,閥瓣設計在鉸鏈機構,以便閥瓣具有足夠有旋啟空間,并使閥瓣真正的、全面的與閥座接觸。閥瓣可以全部用金屬制成,也可以在金屬上鑲嵌皮革、橡膠、或者采用合成覆蓋面,這取決于使用性能的要求。旋啟式止回閥在完全打開的狀況下,流體壓力幾乎不受阻礙,因此通過閥門的壓力降相對較小。升降式止回閥的閥瓣坐落位于閥體上閥座密封面上。此閥門除了閥瓣可以自由地升降之外,其余部分如同截止閥一樣,流體壓力使閥瓣從閥座密封面上抬起,介質回流導致閥瓣回落到閥座上,并切斷流動。根據使用條件,閥瓣可以是全金屬結構,也可以是在閥瓣架上鑲嵌橡膠墊或橡膠環(huán)的形式。像截止閥一樣,流體通過升降式止回閥的通道也是狹窄的,因此通過升降式止回閥的壓力降比旋啟式止回閥大些,而且旋啟式止回閥的流量受到的限制很少。
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機床是指制造機器的機器,亦稱工作母機或工具機,習慣上簡稱機床。一般分為金屬切削機床、鍛壓機床和木工機床等。現代機械制造中加工機械零件的方法很多:除切削加工外,還有鑄造、鍛造、焊接、沖壓、擠壓等,但凡屬精度要求較高和表面粗糙度要求較細的零件,一般都需在機床上用切削的方法進行終加工。機床在國民經濟現代化的建設中起著重大作用。
車床是主要用車刀對旋轉的工件進行車削加工的機床。在車床上還可用鉆頭、擴孔鉆、鉸刀、絲錐、板牙和滾花工具等進行相應的加工。車床主要用于加工軸、盤、套和其他具有回轉表面的工件,是機械制造和修配工廠中使用廣的一類機床。
鍛壓機床
鍛壓機床是金屬和機械冷加工用的設備,他只改變金屬的外形狀。鍛壓機床包括卷板機,剪板機,沖床,壓力機,液壓機,油壓機,折彎機等。
液壓機是一種以液體為工作介質,根據帕斯卡原理制成的用于傳遞能量以實現各種工藝的機器。液壓機一般由本機(主機)、動力系統及液壓控制系統三部分組成。液壓機分類有閥門液壓機,液體液壓機,工程液壓機。
液壓機(又名:油壓機)液壓機是一種利用液體靜壓力來加工金屬、塑料、橡膠、木材、粉末等制品的機械。它常用于壓制工藝和壓制成形工藝,如:鍛壓、沖壓、冷擠、校直、彎曲、翻邊、薄板拉深、粉末冶金、壓裝等等。
它的原理是利用帕斯卡定律制成的利用液體壓強傳動的機械,種類很多。當然,用途也根據需要是多種多樣的。如按傳遞壓強的液體種類來分,有油壓機和水壓機兩大類。
液壓機是一種以液體為工作介質,用來傳遞能量以實現各種工藝的機器。液壓機除用于鍛壓成形外,也可用于矯正、壓裝、打包、壓塊和壓板等。液壓機包括水壓機和油壓機。以水基液體為工作介質的稱為水壓機,以油為工作介質的稱為油壓機。液壓機的規(guī)格一般用公稱工作力(千牛)或公稱噸位(噸)表示。鍛造用液壓機多是水壓機,噸位較高。為減小設備尺寸,大型鍛造水壓機常用較高壓強(35兆帕左右),有時也采用 100兆帕以上的超高壓。其他用途的液壓機一般采用 6~25兆帕的工作壓強。油壓機的噸位比水壓機低。
壓鑄機就是用于壓力鑄造的機器。包括熱壓室及冷壓室兩種。后都又分為直式和臥式兩種類型。壓鑄機在壓力作用下把熔融金屬液壓射到模具中冷卻成型,開模后可以得到固體金屬鑄件,初用于壓鑄鉛字。
壓鑄機主要由合模機構、壓射機構、液壓系統和電力控制系統等各部分組成。除此之外,壓鑄機還有零部件及機座、其他裝置、輔助裝置等部分。
合模機構
驅動壓鑄模進行合攏和開啟的動作。當模具合攏后,具有足夠的能力將模具鎖緊,確保在壓射填充的過程中模具分型面不會脹開。鎖緊模具的力即稱為鎖模力(又稱合型力),單位為千牛(kN),是表征壓鑄機大小的首要參數。
壓射機構
按規(guī)定的速度推送壓室內的金屬液,并有足夠的能量使之流經模具內的澆道和內澆口,進而填充入模具型腔,隨后保持一定的壓力傳遞給正在凝固的金屬液,直至形成壓鑄件為止。在壓射動作全部完成后,壓射沖頭返回復位。
液壓系統
為壓鑄機的運行提供足夠的動力和能量。
電氣控制系統
控制壓鑄機各機構的執(zhí)行動作按預定程序運行。
塑料加工工業(yè)中所用的各類機械和裝置的總稱。某些流體和固體輸送、分離、破碎、磨碎以及干燥等通用性機械和設備,在塑料加工工業(yè)中也占有重要地位,所以常列為塑料機械。現代塑料機械的設計和制造,除有賴于機械工程和材料科學的發(fā)展外,特別與塑料工程理論研究的進展密切相關。