電液比例閥基本原理-資料下載頁(yè)
2025-05-03 18:44本頁(yè)面
【正文】 reduced is also critical in many processes. 在機(jī)器運(yùn)行周期后段 ， 在很多工序中壓力等級(jí)的降低也是要求很嚴(yán)格的 。 FORCE CONTROL Motion and force control can thus be achieved using proportional valves, and in some cases the same valve can be used for both motion and force control. This is usually referred to as ‘PQ’ control ie. the control of both pressure (P) and flow (Q). Furthermore, all of these control functions can be achieved using electronic inputs to the valve thus providing a simple interface to the machine controller. 運(yùn)動(dòng)和力的控制因此能夠通過使用比例閥來完成 ， 同時(shí)在某些場(chǎng)合同一個(gè)閥能夠同時(shí)用于運(yùn)動(dòng)控制和力控制 。 這通常被稱為‘ PQ”控制 ， 也就是說同時(shí)控制壓力和流量 。 此外 ， 所有這些控制功能可以使用輸入到閥的電子輸入信號(hào)被完成 ， 只需通過提供的到機(jī)械控制器的簡(jiǎn)單接口 。 ELECTRONIC CONTROL 電子控制 閥輸入信號(hào) VALVE INPUT SIGNAL As described earlier, the electrical current to the solenoid of a proportional valve needs to be regulated and not just simply switched on or off as is the case with a conventional valve. 作為簡(jiǎn)單描述 ， 提供給比例閥電磁鐵的電流需要被調(diào)節(jié) ， 不象應(yīng)用常規(guī)閥的時(shí)僅有開關(guān)通或斷那樣簡(jiǎn)單 。 閥輸入信號(hào) VALVE INPUT SIGNAL In theory, this could be achieved by using a dimmer switch type ponent (ie. a variable resistor). Practical problems such as heat generation and drift however mean that such a device would not normally be used except for the very simplest applications. 在理論上這可以通過使用一個(gè)調(diào)光開關(guān)式的元件來完成 （ 例如 ， 一個(gè)可變電阻 ） 。實(shí)際上由于發(fā)熱和漂移這樣的設(shè)備一般不被使用 ， 除非一些最簡(jiǎn)單的應(yīng)用中 。 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER Normally, the current flowing through the proportional solenoid will be controlled by some form of electronic amplifier. The amplifier itself will require a power supply (usually 12 or 24 VDC) and a mand input signal. 一般地 ， 通過比例閥電磁鐵地電流由一些形式地電子放大器控制 。 放大器要求一個(gè)電源和一個(gè)命令輸入信號(hào) 。 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER 放大器地輸出 （ 電流 ） 由輸入信號(hào)控制 ， 所有零輸入信號(hào) ， 電流輸出也是零 。 The output of the amplifier (electrical current) is controlled by the input signal so with zero input the output current is also zero. 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER Increasing the input signal to the amplifier results in a corresponding increase in output current to the valve solenoid. 增加放大器地輸入信號(hào)會(huì)導(dǎo)致輸出到閥電磁鐵的電流相應(yīng)的增加 。 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER Increasing the input signal to the amplifier results in a corresponding increase in output current to the valve solenoid. 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER Increasing the input signal to the amplifier results in a corresponding increase in output current to the valve solenoid. 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER The relatively large current required to drive the valve solenoid (typically 2 to 3 amps) is provided by the power supply so the current required from the input signal device is very small (normally just a few milliamps). The input control device can therefore be a simple potentiometer. 一個(gè)相對(duì)較大的閥電磁鐵輸入電流 （ 通常 2到 3安培 ） 是由電源提供的 ， 所有輸入裝置的電流要求非常小 （ 一般僅有幾毫安 ） ， 因此輸入控制裝置可以是一個(gè)簡(jiǎn)單的電位計(jì) 。 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER In mobile applications the input device could by a joystick type potentiometer. 在行走應(yīng)用中 ， 輸入裝置可以是一個(gè)操作桿型的電位計(jì) 。 24 V DC 比例閥放大器 PROPORTIONAL VALVE AMPLIFIER In an increasing number of applications however, the input signal is generated by the machine controller itself (eg. a PLC Programmable Logic Controller). This can then be fed directly to the valve amplifier to generate the appropriate output. 在越來越多的應(yīng)用中 ， 輸入信號(hào)可以由控制器產(chǎn)生 （ 例如 ， 一個(gè) PLC－ 可編程控制器 ） ， 可以直接輸入到閥放大器以產(chǎn)生適當(dāng)?shù)碾娏?。
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