檢(jian)針(zhen)機的用(yong)途真是(shi)非常廣泛的，對(dui)于(yu)檢(jian)針(zhen)機廣泛用(yong)途舉例說(shuo)明,由于(yu)檢(jian)針(zhen)機太過常見(jian)，可能(neng)很(hen)多(duo)人都沒有注意到(dao)，檢(jian)針(zhen)機的應(ying)用(yong)以(yi)及普及到(dao)生活各個地(di)方。

    目前(qian)，檢針機已經發揮到了(le)良好的水平(ping)，像服裝、床(chuang)上(shang)用品、皮鞋毛衫、食品和醫學等方(fang)面(mian)，檢針機可以用來(lai)檢測生(sheng)產過程(cheng)中的殘留鐵屑。

    檢針機是非常可靠的幫手，一方面可以檢測夾雜失落在原料中的斷針，還可以檢測金屬的儀器紫裝，這對于時間的節省和機器的完善有確切性的影響。
　　調節檢(jian)針器(qi)(qi)(qi)高頻振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)的增(zeng)益電位器(qi)(qi)(qi)，恰(qia)好使振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)處于(yu)臨界振(zhen)蕩(dang)(dang)狀態(tai)(tai)，也(ye)就是(shi)說剛好使振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)起振(zhen)。當探測線(xian)圈(quan)L1靠近金(jin)屬物體(ti)時(shi)，由于(yu)電磁(ci)感應現像，會在金(jin)屬導體(ti)中(zhong)產(chan)生渦電流，使振(zhen)蕩(dang)(dang)回路(lu)中(zhong)的能(neng)量損耗(hao)增(zeng)大，正反饋(kui)減弱，處于(yu)臨界態(tai)(tai)的振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)振(zhen)蕩(dang)(dang)減弱，甚至無法維持振(zhen)蕩(dang)(dang)所需的最(zui)低(di)能(neng)量而(er)停(ting)振(zhen)。如果能(neng)檢(jian)測出這種變化(hua)，并轉換成聲音信號，根據(ju)聲音有無，就可以判(pan)定(ding)探測線(xian)圈(quan)下面是(shi)否(fou)有金(jin)屬物體(ti)了。

振蕩檢測(ce)器

　　振(zhen)(zhen)(zhen)蕩(dang)(dang)檢測(ce)器(qi)(qi)由檢針(zhen)器(qi)(qi)廠家三極管開(kai)關電(dian)(dian)(dian)(dian)路和濾(lv)(lv)波電(dian)(dian)(dian)(dian)路組成。開(kai)關電(dian)(dian)(dian)(dian)路由三極管VT2、二極管VD2等組成，濾(lv)(lv)波電(dian)(dian)(dian)(dian)路由濾(lv)(lv)波電(dian)(dian)(dian)(dian)阻器(qi)(qi)R3，濾(lv)(lv)波電(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)C2、C3和C4組成。在開(kai)關電(dian)(dian)(dian)(dian)路中(zhong)，VT2的基極與次級線圈L2的“C”端相連，當(dang)高(gao)(gao)頻(pin)振(zhen)(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)工(gong)(gong)作時(shi)，經高(gao)(gao)頻(pin)變壓器(qi)(qi)T1耦(ou)合(he)過(guo)來的振(zhen)(zhen)(zhen)蕩(dang)(dang)信號(hao)，正半周使VT2導通，VT2集電(dian)(dian)(dian)(dian)極輸出負脈(mo)沖信號(hao)，經過(guo)π型RC濾(lv)(lv)波器(qi)(qi)，在負載電(dian)(dian)(dian)(dian)阻器(qi)(qi)R4上輸出低電(dian)(dian)(dian)(dian)平(ping)信號(hao)。當(dang)高(gao)(gao)頻(pin)振(zhen)(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)停(ting)振(zhen)(zhen)(zhen)蕩(dang)(dang)時(shi)，“C”端無(wu)振(zhen)(zhen)(zhen)蕩(dang)(dang)信號(hao)，又由于(yu)二極管VD2接在VT2發射(she)極與地之(zhi)間，VT2基極被反向偏置，VT2處于(yu)可(ke)(ke)靠(kao)的截止狀態，VT2集電(dian)(dian)(dian)(dian)極為(wei)高(gao)(gao)電(dian)(dian)(dian)(dian)平(ping)，經過(guo)濾(lv)(lv)波器(qi)(qi)，在R4上得到(dao)高(gao)(gao)電(dian)(dian)(dian)(dian)平(ping)信號(hao)。由此(ci)可(ke)(ke)見，當(dang)高(gao)(gao)頻(pin)振(zhen)(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)正常工(gong)(gong)作時(shi)，在R4上得到(dao)低電(dian)(dian)(dian)(dian)平(ping)信號(hao)，停(ting)振(zhen)(zhen)(zhen)時(shi)，為(wei)高(gao)(gao)電(dian)(dian)(dian)(dian)平(ping)，由此(ci)完成了(le)對振(zhen)(zhen)(zhen)蕩(dang)(dang)器(qi)(qi)工(gong)(gong)作狀態的檢測(ce)。

音頻(pin)振蕩器

　　音(yin)頻振蕩(dang)器(qi)檢針器(qi)設備采用(yong)互(hu)補(bu)型(xing)多諧振蕩(dang)器(qi)，由三極(ji)(ji)管(guan)VT3、VT4，電(dian)(dian)(dian)(dian)阻(zu)器(qi)R5、R7、R8和電(dian)(dian)(dian)(dian)容器(qi)C6組成。互(hu)補(bu)型(xing)多諧振蕩(dang)器(qi)采用(yong)兩(liang)只不(bu)同類型(xing)的(de)(de)三極(ji)(ji)管(guan)，其中VT3為NPN型(xing)三極(ji)(ji)管(guan)，VT4為PNP型(xing)三極(ji)(ji)管(guan)，連(lian)接成互(hu)補(bu)的(de)(de)、能(neng)夠強化正(zheng)反饋的(de)(de)電(dian)(dian)(dian)(dian)路(lu)。在電(dian)(dian)(dian)(dian)路(lu)工(gong)作時，它們能(neng)夠交替地進入(ru)導(dao)通(tong)(tong)和截止狀態，產生音(yin)頻振蕩(dang)。R7既是(shi)VT3負(fu)載電(dian)(dian)(dian)(dian)阻(zu)器(qi)，又是(shi)VT3導(dao)通(tong)(tong)時VT4基極(ji)(ji)限流電(dian)(dian)(dian)(dian)阻(zu)器(qi)。R8是(shi)VT4集電(dian)(dian)(dian)(dian)極(ji)(ji)負(fu)載電(dian)(dian)(dian)(dian)阻(zu)器(qi)，振蕩(dang)脈沖信號由VT4集電(dian)(dian)(dian)(dian)極(ji)(ji)輸出(chu)。R5和C6等是(shi)反饋電(dian)(dian)(dian)(dian)阻(zu)器(qi)和電(dian)(dian)(dian)(dian)容器(qi)，其數值大(da)小影響振蕩(dang)頻率的(de)(de)高低。