目錄
一、概述
二、主要技術指標
三、主要結構特點
四、使用與維修
五、注意事項
六、操作步驟
七、裝箱配置
附錄
OPERATION INSTRUCTIONS
一、概述
本磁軛式磁粉探傷儀是小型便攜式無損檢測的專用儀器,是采用磁場磁化工件的原理設計而成的小型無損檢測儀器,具有對被探工件的裂紋顯示清晰,性能可靠穩(wěn)定和操作方便等諸多特點。
此儀器利用直接纏繞于探頭上的線圈,產生感應磁場,磁化工件。本設備具有體積小、重量輕、提升力大和活動關節(jié)可調等特點,適用平面焊縫、角焊縫、鋼管、壓力容器、管道、軸及形狀復雜的零件的探傷。
圖一:磁粉探傷儀外觀
本系列產品符合所有工業(yè)標準對交直流磁軛提升力的檢測要求,可以對不同類型的零件磁化。本產品適用于油田、造船、汽車、煤礦、機械、橋梁、化工、鐵路、標準件、飛機制造、內燃機配件等行業(yè)產品;也可以檢測因鍛壓、淬火、焊接、疲勞等引起的表面和近表面的缺陷。
此儀器隨機帶有LED照明燈,極大方便客戶的使用;其特點是亮度大、壽命長、更換方便,是便攜式磁粉探傷儀的一次技術革新。本產品已申請了國家的技術,受國家法保護,其它企業(yè)禁止模仿。
本系列產品有三個種類,分別為交流、直流、交直流兩用磁粉探傷儀;交流供電電源為220V交流電直接接入,無需其它儀器配套,操作方便;直流供電電源為可反復充電使用的鋰電池,非常適用于野外無電源現(xiàn)場及高壓不適宜進入的容器、管道和橋梁等現(xiàn)場。鋰電池每次充電時間為3到5個小時,一次充電可以連續(xù)工作6到8小時。
二、主要技術指標
1、輸入電壓:~220V±10%,50-60HZ;
2、工作電流:交流2A、直流1.8A;
3、探頭極距:20-200mm;
4、提升力:交流(平面)7.5Kg、直流30Kg以上;
5、儀器重量:2.9Kg;
6、靈敏度:A型試片顯示清晰;
7、電源電纜:5.5米;
8、工作溫度:-10-50°C;
9、外形尺寸:190×248×56mm;
10、工作周期:2分鐘開-2分鐘關;
11、LED照明燈:3W;
12、充電電池:鋰電。
三、主要結構特點
附件電源電纜是一根三芯電纜,一端通過圓形航空插頭插入探頭,另一端與交流~220V插座相連。配套探頭采用高強度絕緣材料制成,檢驗合格后用環(huán)氧樹脂膠連成一體,達到既密封絕緣,又不易損壞,操作舒適;探頭上有活動關節(jié),可供用戶在特定的工件上使用;也可使用平面磁軛的兩邊,具體是看所磁化的工件形狀。
附件鋰電池接入到儀器的航空插頭上,把交直流轉換開關選為“O”,就可以開始直流探傷的操作。
四、使用與維修
1、先將電源電纜與探頭連接旋緊,再通~220V交流電,把交直流轉換開關選為“I”, 就可以開始交流探傷的操作。
2、把鋰電與與探頭連接旋緊,再把交直流轉換開關選為“O”,就可以開始直流探傷的操作。
3、根據被探工件的形狀不同,調節(jié)探頭的角度或取下活動關節(jié)。
4、使用此探傷儀之前,先將探頭與被探工件接觸好,在被探工件面上噴灑上磁粉或磁懸液,這時按下探頭手把上的充磁開關,工作呈磁化狀態(tài),松開按鈕開關,觀察工件是否有磁痕,工件上如有裂紋,在磁化時有裂紋的地方就會聚結磁粉,就形成磁痕。
圖二:磁粉探傷儀現(xiàn)場實測圖片
五、注意事項
1、儀器在使用時,應避免空載工作,防止產生不必要的溫升或損壞。
2、使用探頭時,端面與被檢測工件要保持良好地接觸,再按下手把上的充磁按鈕開關,此時探傷,探頭應避免碰撞,保持清潔。
3、在使用時,如果發(fā)現(xiàn)探頭線包有發(fā)熱情況,應適當休息后再投入使用;如果發(fā)現(xiàn)探頭線包發(fā)熱嚴重,應立刻停止使用,檢查故障原因,經檢修后再使用,否則會損壞探頭。
4、儀器停止使用時,應切斷配電板上的電源開關。
5、探傷結束后,在探頭的活動關節(jié)部位,應清除雜物并加注潤滑油。
6、磁懸液使用水劑時,應加入適量防銹劑。
7、不要盲目使用,不要接近高溫物體;不要在雨中工作,噴灑磁懸液切勿噴到開關、插頭座上。
8、如LED照明燈損壞,可以聯(lián)系廠家維修;用戶也可以從廠家購買LED燈,自行安裝。
六、操作步驟
1、工件表面預處理
清除工件表面的污物,如油污、鐵銹、涂料層、毛刺及灰塵、氧化皮和金屬屑等。
2、磁化與磁粉介質的施加
磁化時,磁頭必須與工件表面緊密接觸,一邊通電,一邊噴灑磁粉,干法檢測必須在工件表面和磁粉*干燥的條件下進行,否則表面會粘附磁粉,使襯底變差影響缺陷觀察。干法檢測在整個磁化過程中要一直保持通電磁化,只有觀察磁痕結束后才能撤除磁化磁場。施加磁粉時,干粉應呈均勻霧狀分布于受檢工件表面。
七、裝箱配置
1、磁軛式磁粉探傷儀 1臺
2、輸入電源線 1根
3、磁膏 1盒
4、電筆 1支
5、使用說明書 1份
6、產品合格證 1份
7、產品保修卡 1份
8、鋰電池、充電器和鋰電池腰包 1套(直流功能選配)
注:隨機配有電工用電筆,供用戶定期檢測探傷儀是否漏電
附錄:磁膏的介紹及使用方法
磁膏的組成部分:
黑磁粉,潤濕劑,分散劑,懸浮劑,消泡劑,防銹劑,隨儀器配的磁膏易融于水,配置方便,可以提高磁粉探傷檢測功效,靈敏度高,無毒無害。 磁粉檢測方法根據載液不同分為濕法檢測和干法檢測:濕法檢測是將磁粉懸浮在載液中進行檢測的方法,干法檢測是以空氣為載體將干磁粉施加在工件表面進行檢測的方法。使用濕法檢測時,可將黑磁膏與水混合,得到濃度適宜的磁懸液,建議配制濃度為每10-25g黑磁膏配水1升。
磁膏的適用范圍:
1. 黑磁膏適用于特種設備上的焊縫、宇航工件及靈敏度要求較高的工件檢測。
2. 黑磁膏適用于大批量工件的檢測,常與固定式設備配合使用。
3. 黑磁膏適用于檢測表面微小缺陷,如疲勞裂紋、磨削裂紋、焊接裂紋和發(fā)紋等。
使用磁膏時的操作要點:
1. 黑磁膏所配制的磁懸液可采用澆法、噴法和浸法,但不能采用刷涂法。
2. 連續(xù)法宜用澆法和噴法,黑磁膏所配液體液流要微弱,以免沖刷掉已經形成的磁痕顯示。
3. 水與黑磁膏配比時,應進行水斷實驗。
4. 水與黑磁膏的配比濃度為推薦濃度,可根據各種工件表面的不同,選擇不同的黑磁膏配比濃度。
5. 仰視檢測和水中檢驗宜使用黑磁膏。
黑磁膏適用于濕法非熒光磁粉探傷,當被檢工件為淺色時,黑磁膏與工件對比度*;若工件表面為深色,黑磁膏與工件對比度不夠清晰,建議采用反差增強劑來提高黑磁膏與工件對比度。
磁膏顆粒度:10μm≤80%≤40μm
建議配制濃度:每10-25g黑磁膏配水1升
Handheld Magnetic Particle NDT Yoke
OPERATION INSTRUCTIONS
The Contour Probe is a rugged high performance instrument for Magnetic Particle inspection to accepted nondestructive testing stands. Certain operating procedures and safety precautions should be observed.
CHARACTERISTICS:New concept of the magnetic yoke flaw detector is applied;Being listed by aircraft maintenance manual for specific products;Using many advanced techniques to the formation of induced magnetic field;Controller and solid state electronic devices as one of the high-performance portable instruments;Fixed AC magnetic field, for surface and near surface defect detection; Concentration of the magnetic field can be applied to the detection of high-energy area, to quickly and accurately find material defects;Yoke is light, reliable, can be used with dry powder and wet fluorescent magnetic particle;TECHNICAL PARAMETERS:Power: 220VAC Frequency: 50-60Hz Current: AC2A Magnetic field: AC Pole spacing 20-200mm Lift: > 7.5KGOperating temperature: -10-50 °C Dimensions 190 * 248 * 56mm 5M long 3-core cable size Work cycle: 2 minutes on -2 minutes off Weight 3.0KGELECTRICAL:
The Contour Probe is designed to operate from a standard 220VAC, 50Hz, grounded power source. Repairs should not be attempted on the yoke units. Units are sealed and should be returned to the factory for service.
INSTRUMENT DESCRIPTION:
Basically the Coutour Probe is an electromagnet producing a strong AC magnetic field. Plcement of the two poles (legs) upon ferrous materials merely provides a path for the intense magnetic fied to pass from one pole to the other. The part completes the flux path and becomes highly magnetized.
In overall design and performance, the Contour Probe comprises a coil wound on a laminated steel leg assembly contained within the rugged molded housing. Flexibility of the legs allows the field to actually be “focused” at the precise area of inspection.
OPERATION:
Plug the Conter Probe into a Grounded power source . Place the Probe legs upon the work surface with the suspected defect at right angles to the legs. Push the test switch and lightly dust or float inspection powder over the area being inspected. Defect indications will be revealed by oberserving irregular patterns. Turn the Probe 90 degrees from the first test and repeat the procedure . Test switch should be released after powder application. However, if excess powder is to be lightly blown away, as is the procedure to reveal minute indications, the Probe should remain energized while this procedure is performed.
DEMAGNETIZATION:
Small pieces which have become residually magnetized, may be easily demagnetized by the following procedure. Energize the Probe and pass small parts through the area between the pole ends “feet” and withdraw to a distance of about two feet. On large pieces, place the Probe in the same poition as inspection, energize and lift from the work surface to a distance of about two feet. This procedure may need to be repeated more than once to remove the residual field.
AC MAGNETIZATION:
An AC field induced into a part is a skin or surface field and does not penetrate the cross section of the material. A bi-product of AC is in the form of eddy currents which tend to guide or direct the magnetic field in a basically narrow pattern between the poles. Another bi-product is a vibratory action which adds mobility to the inspection particles to form a highly defined powder build-up at the defect. For these reasons, an AC field is the most desirable for the detection of surface or surface breaking defects.
Maintainance:
This series contour probes are designed to provide a strong magnetic field for the detection of cracks and flaws in ferrous metals. The instrument should be tested periodically to assure adequate field strength, per applicable inspection agency.
The instrument should be wiped clean with a general purpose cleaner after each use .
The contour probes are sold without electrical power plugs. Only approved plugs should be used and installed by certified personnel.
Duty Cycle:
Two Minutes “On”, Two Minutes “Off”.
Operating Environment:
Temperature: 14°to 122°F(-10°to 50°C). Relative humidity:10% to 95%, non-condensing.
Shipping and Storage Environment:
Temperature: --40°to 140°F (-40°to 60°C). Relative humidity: 5% to 95%.
Vibration and shock:
As encountered in normal shipping and handling with no degradation.