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</tr> <tr><td> <table width=100% border=0 cellpadding=0 cellspacing=0> </table> </td></tr> </table></div ></div> </div> <div class="xeyifqp" id="center"> <div class="xeyifqp" id="bodycontent" class="mianbxContent" style="height:25px;width:90%;text-align:right;"><a href="/">首頁(yè)</a> > <a href="/html/list-20-1.html">新聞中心</a> > <a href="/html/list-21-1.html">新聞資訊</a></div> <div class="xeyifqp" id="bodycontent"> <div style="width:950px;height:30px;" class="news_content_title"> <h3 style="color:#333;margin:0pt 0pt 0pt 0pt;"> <strong>繞線(xiàn)機安全防護裝置硬件的特點(diǎn)</strong> </h3><hr width="95%" size="1" noshade> </div> <div style="width:950px; text-align:left; line-height:180%;" class="news_content_body"> <p class="MsoNormal"> <span style="line-height:1.5;">1、邏輯控制芯片的選擇</span> </p> <p class="MsoNormal"> 本項目中邏輯控制芯片用于接收傳感器反饋的輸入信號，并根據反饋信號輸出相應控制信號給繼電器控制模塊，從而實(shí)現降低繞線(xiàn)圈轉速的目的。邏輯控制芯片<span lang="EN-US"> 74LS21P </span>符合本項目控制要求。邏輯控制芯片<span lang="EN-US"> 74LS21 </span>為兩組<span lang="EN-US"> 4 </span>輸入端與門(mén)（正邏輯），其主要電氣特性的典型值為：<span lang="EN-US">tPLH </span>為<span lang="EN-US"> 8 ns</span>，<span lang="EN-US">tphl </span>為<span lang="EN-US"> 10 ns</span>，<span lang="EN-US">PD </span>為<span lang="EN-US"> 9 mW</span>，其邏輯關(guān)系如圖<span lang="EN-US"> 3 </span>所示。 </p> <p class="MsoNormal"> <img src="/upload/image/20200506/20200506130379647964.png" alt="邏輯控制芯片的選擇" width="860" height="297" title="邏輯控制芯片的選擇" align="" /> </p> <p class="MsoNormal"> 圖<span lang="EN-US"> 3 </span>中，輸入電壓為<span lang="EN-US"> 7 V</span>，<span lang="EN-US">A~D </span>間電壓為<span lang="EN-US"> 5.5 V</span>，工作環(huán)境溫度為<span lang="EN-US"> 0~70 </span>℃，存儲溫度為<span lang="EN-US">-65~150 </span>℃。 </p> <p class="MsoNormal"> 各功能如表<span lang="EN-US"> 1 </span>所示。 </p> <p class="MsoNormal"> <span lang="EN-US"> </span> </p> <p class="MsoNormal"> <span lang="EN-US">2、 </span>繼電器模塊 </p> <p class="MsoNormal"> 本項目所采用的電磁式繼電器由鐵芯、線(xiàn)圈、銜鐵、觸點(diǎn)簧片等組成。只要在線(xiàn)圈兩端加上一定的電壓，線(xiàn)圈中就會(huì )流過(guò)一定的電流，從而產(chǎn)生電磁效應，銜鐵就會(huì )在電磁力吸引的作用下克服返回彈簧的拉力吸向鐵芯，從而帶動(dòng)銜鐵的動(dòng)觸點(diǎn)與靜觸點(diǎn)（常開(kāi)觸點(diǎn)）吸合。當線(xiàn)圈斷電后，電磁的吸力也隨之消失，銜鐵就會(huì )在彈簧的反作用力作用下返回原來(lái)的位置，使動(dòng)觸點(diǎn)與原來(lái)的靜觸點(diǎn)（常閉觸點(diǎn)）釋放。 </p> <p class="MsoNormal"> 這樣吸合、釋放，就可達到在電路中的導通、切斷的目的。 </p> <p class="MsoNormal"> 對于繼電器的常開(kāi)、常閉觸點(diǎn)，可以這樣來(lái)區分：繼電器線(xiàn)圈未通電時(shí)處于斷開(kāi)狀態(tài)的靜觸點(diǎn)，稱(chēng)為常開(kāi)觸點(diǎn)；處于接通狀態(tài)的靜觸點(diǎn)稱(chēng)為常閉觸點(diǎn)。繼電器一般有兩股電路，即低壓控制電路和高壓工作電路。當繼電器線(xiàn)圈兩端無(wú)電壓或電壓不夠時(shí)，繼電器的公共端（<span lang="EN-US">COM</span>）與常閉端（<span lang="EN-US">NC</span>）接通。當繼電器線(xiàn)圈兩端電壓達到吸合時(shí)，繼電器的公共端（<span lang="EN-US">COM</span>）與常開(kāi)端（<span lang="EN-US">NO</span>）接通，其原理如圖<span lang="EN-US"> 4 </span>所示。 </p> <p class="MsoNormal"> <img src="/upload/image/20200506/20200506130372007200.png" alt="圖 4 繼電器工作原理" width="833" height="299" title="圖 4 繼電器工作原理" align="" /> </p> <p class="MsoNormal"> 圖<span lang="EN-US"> 4 </span>繼電器工作原理 </p> <p class="MsoNormal"> 在調試中，測得腳踏板中<span lang="EN-US"> Rp5 </span>的電阻為<span lang="EN-US"> 500 </span>Ω。因此，為了控制繞線(xiàn)電機的速度，在繼電器控制模塊中聯(lián)入<span lang="EN-US"> 2 </span>個(gè)最大值為<span lang="EN-US"> 1 000 </span>Ω 的可調電阻<span lang="EN-US"> R1 </span>和<span lang="EN-US"> R2</span>。 </p> <p class="MsoNormal"> <span lang="EN-US">3、</span>紅外線(xiàn)數字避障傳感器 </p> <p class="MsoNormal"> 本項目選用了價(jià)格便宜、抗干擾性強、靈敏度高以及反應快的反射式紅外線(xiàn)數字避障傳感器<span lang="EN-US"> </span>，博光<span lang="EN-US">-50NK</span>，這是一種集發(fā)射與接收于一體的光電傳感器。檢測距離可以根據要求進(jìn)行調節。該傳感器具有探測距離遠、受可見(jiàn)光干擾小、價(jià)格便宜、易于裝配、使用方便等特點(diǎn)，可以廣泛應用于機器人避障、流水線(xiàn)計件等眾多場(chǎng)合。博光<span lang="EN-US">-50NK</span>（<span lang="EN-US">NPN </span>型光電開(kāi)關(guān)）其輸出狀態(tài)是<span lang="EN-US"> 0</span>、<span lang="EN-US">1</span>，即數字電路中的高電平和低電平。沒(méi)檢測到物體時(shí)輸出高電平及<span lang="EN-US"> VCC</span>，檢測到物體時(shí)輸出低電平及<span lang="EN-US"> 0.7 V</span>。 </p> <p class="MsoNormal"> 其電氣特性如下：工作電壓為<span lang="EN-US"> 5 V</span>，工作電流為<span lang="EN-US"> 10 mA</span>，信號輸出為<span lang="EN-US"> TTL </span>電平。感應距離為<span lang="EN-US"> 2~50cm</span>。尺寸為<span lang="EN-US"> 31 mm</span>×<span lang="EN-US">25 mm</span>×<span lang="EN-US">13 mm</span>。接線(xiàn)圖時(shí)輸出信號需要加上拉電阻。特點(diǎn)為輸出信號穩定，不受可見(jiàn)光影響，壽命長(cháng)。 </p> <p class="MsoNormal"> <span lang="EN-US">4、</span>聯(lián)機測試 </p> <p class="MsoNormal"> 通電源，當按下安全防護裝置的開(kāi)關(guān)按鍵，安全防護裝置紅色指示燈亮，兩繼電器紅色電源<span lang="EN-US"> LED </span>指示燈亮，處于常態(tài)（非動(dòng)作狀態(tài)），此時(shí)可調電阻<span lang="EN-US"> R1</span>、<span lang="EN-US">R2 </span>沒(méi)有串入腳踏調速回路，繞線(xiàn)機穩定工作。 </p> <p class="MsoNormal"> （<span lang="EN-US">1</span>）當操作工人將手移動(dòng)到次級紅外線(xiàn)數字避障傳感器檢測范圍時(shí)，次級繼電器動(dòng)作，常閉觸點(diǎn)斷開(kāi)，常開(kāi)觸點(diǎn)吸合，相對應的黃色<span lang="EN-US"> LED </span>指示燈亮，這時(shí)腳踏調速回路中串入可調電阻<span lang="EN-US"> R1 </span>使得總電阻增加，導致輸入到繞線(xiàn)變頻器的模擬電壓的電壓源<span lang="EN-US"> U </span>降低，繞線(xiàn)變頻器的頻率隨之降低，根據式（<span lang="EN-US">1</span>）可知，繞線(xiàn)電機的轉速<span lang="EN-US"> n </span>也隨之降低，即儲線(xiàn)環(huán)的轉速也就降低了，這時(shí)工人操作的安全性也就提高了。 </p> <p class="MsoNormal"> （<span lang="EN-US">2</span>）當工人手繼續往儲線(xiàn)環(huán)移動(dòng)，進(jìn)入一級紅外線(xiàn)數字避障傳感器檢測范圍時(shí)，一級繼電器動(dòng)作，常閉觸點(diǎn)斷開(kāi)，常開(kāi)觸點(diǎn)吸合，黃色<span lang="EN-US"> LED </span>指示燈都亮，這時(shí)腳踏調速回路中串入可調電阻<span lang="EN-US"> R1</span>、<span lang="EN-US">R2 </span>使得總電阻增加到最大，導致輸入到繞線(xiàn)變頻器的模擬電壓的電壓源<span lang="EN-US"> U </span>降到可調節的最低值，繞線(xiàn)變頻器的頻率隨之降到最低。同樣根據式（<span lang="EN-US">1</span>）可知，這時(shí)繞線(xiàn)電機的轉速<span lang="EN-US"> n </span>也進(jìn)一步降低，即儲線(xiàn)環(huán)的轉速也就降到較低速度，這時(shí)工人操作的安全性再次提高。 </p> <p class="MsoNormal"> 本項目所設計安全防護裝置需與繞線(xiàn)機配合完成工作，并按照以下步驟進(jìn)行測試。 </p> <p class="MsoNormal"> （<span lang="EN-US">1</span>）檢查安全防護裝置接線(xiàn)是否正確。 </p> <p class="MsoNormal"> （<span lang="EN-US">2</span>）將傳感器安裝到繞線(xiàn)機適當位置。 </p> <p class="MsoNormal"> （<span lang="EN-US">3</span>）將安全防護裝置串接到<a href="http://m.e-seiyaku.com/" target="_blank"><strong>繞線(xiàn)機</strong></a>腳踏調速回路中。 </p> <p class="MsoNormal"> （<span lang="EN-US">4</span>）將未繞線(xiàn)鐵芯放入<span lang="EN-US"> 3 </span>個(gè)滾動(dòng)輪中，打開(kāi)儲線(xiàn)環(huán)本體燕尾鎖條，將儲線(xiàn)環(huán)開(kāi)口活動(dòng)段分開(kāi)，讓未繞線(xiàn)鐵芯中心空位穿越儲線(xiàn)環(huán)開(kāi)口部分，然后鎖上鎖條。 </p> <p class="MsoNormal"> （<span lang="EN-US">5</span>）踩下腳踏開(kāi)關(guān)，使儲線(xiàn)環(huán)轉動(dòng)。 </p> <p class="MsoNormal"> （<span lang="EN-US">6</span>）將兩只手分別從儲線(xiàn)環(huán)兩邊慢慢伸入到其中心位置，觀(guān)察紅外線(xiàn)數字避障傳感器和繼電器模塊工作狀態(tài)燈的發(fā)光情況及儲線(xiàn)環(huán)轉動(dòng)的速度。 </p> <p class="MsoNormal"> <br /> </p> <p class="MsoNormal"> 基于本系統完成的<span lang="EN-US"> 4 </span>套護手裝置經(jīng)過(guò)<span lang="EN-US"> 3 </span>個(gè)月的運行，沒(méi)有發(fā)生安全事故，有效保護了設備和工人的安全。 </p> <p class="MsoNormal"> 本系統是基于<strong>環(huán)形繞線(xiàn)機</strong>設計的一種安全防護裝置，彌補了市場(chǎng)同類(lèi)產(chǎn)品的缺陷，加裝該安全防護裝置，能降低斷指工傷的發(fā)生率，具有成本低、體積小、控制較精確等優(yōu)點(diǎn)，普遍推廣應用的價(jià)值大，市場(chǎng)潛力巨大，創(chuàng )造的社會(huì )、經(jīng)濟效益值得期待。 </p><script src="/inc/AspCms_VisitsAdd.asp?id=343"></script> </div> <div 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