测控技术与仪器专业英语 张凤登UNIT-9.Manipulative Devices
10页1、UNIT 9 Manipulative Devices,9.1 Text Final Control Elements 终端控制单元,New Words solenoid sulnid n. 电磁线圈,螺线管,电磁阀 pneumatic nju:mtik a. 气动的 hydraulic haidr:lik a. 液动的,液压的 tub tb n. 桶 rinse rins v. 漂洗,漂净 blower blu n. 鼓风机,吹风机 cereal siril a. n. 谷物的;谷物 pellet pelit n. 颗粒,粉末 throttling rtli n. 节流调节 detrimental ,detrimentl a. 不利的,有害的 globe lub n. v. 球形,球体;使成球形 pinch pint n. 收缩,夹紧 butterfly btflai a. n. 蝶形的;蝴蝶 flange flnd n. v. 法兰,凸缘;(在上)安装法兰凸缘 thread red v. n. 拧螺丝,上螺母;线(状物),螺纹,Notes be prone to 倾向于,Exerc
2、ises 1. Answer the following questions. A interface between a controller and the process it controls. Various types of switching elements, actuators, control valves, heaters, and electric motors are essential components. The switching action may be accomplished mechanically by an actuator, electromechanically by a solenoid, electronically by a solid-state device. Stepper motors and servomotors provide the “muscle” for robotic arms. Process requirements, correct valve sizing, suitable flow charac
3、teristics of the valve, fail-safe mode, proper choice of valve body type, and correct installation should be considered. They are globe (including three-way and angle), gate, diaphragm, and pinch. Hydraulic actuators are used where slow, precise positioning is required, or where heavy loads must be moved. Hydraulic actuators operate at higher pressure than pneumatic actuators, so they can provide larger forces from a given-size cylinder or motor. Pneumatic actuators are used where lighter loads
4、are encountered, where an air supply is available, and where fast response is required. Pneumatic actuators are less expensive than hydraulic actuators, and they are capable of much faster movement. The speed of a hydraulic actuator is limited by the maximum flow rate provided by the hydraulic pump.,Exercises (continue) 2. According to the text, fill in the blanks with suitable words or phrases given below in the correct form. turn electromechanically electronically heat severe hydraulic electro
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