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Cixi Jingchuang Industrial Automation Co., Ltd

Contact person: Manager Tu (Sales Manager)

Telephone: 13586643385

Contact: Deng Musong

Telephone: 13506741638

The true: 0574-63571884

Mail Box: 496613547@qq.com

Address: No. 1, Lane 8, Shuiyunpu Road, Liujia Village, Xinpu Town, Cixi City, Zhejiang Province

Web site: www.hnlqy.com


Full automatic vehicle processing bearing eddy current flaw detection and sorting machine

Full automatic vehicle processing bearing eddy current flaw detection and sorting machine

  • Classification:Full automatic vehicle processing bearing eddy current flaw detection and sorting machine
  • Number of visits:second
  • Date of issue:2021-04-24 10:18:42
  • Product overview

Principle of Eddy Current Testing: Eddy current testing uses the principle of electromagnetic induction to excite the probe coil with sinusoidal current. When the probe is close to the metal surface, the alternating magnetic field around the coil generates induced current on the metal surface. For flat metal, the flow of the induced current is a concentric circle of coils, shaped like a vortex, called an eddy current. The eddy also generates a magnetic field of the same frequency, in the opposite direction of the coil's magnetic field. The loss resistance of the eddy current channel and the anti-magnetic flux generated by the eddy current are reflected back to the probe coil, changing the current magnitude and phase of the coil, that is, changing the impedance of the coil. Therefore, when the probe moves on the metal surface and encounters defects or changes in material and size, the reaction of eddy current magnetic field to the coil is different, resulting in changes in coil impedance. By measuring such changes with eddy current testing instruments, the metal surface can be identified with defects or other physical property changes. There are many factors that affect the eddy current field, such as the degree of coupling between the probe coil and the material under test, the shape and size of the material, electrical conductivity, magnetic permeability, and defects. Therefore, the problems of flaw detection, thickness measurement and sorting of metal materials can be solved by using eddy current principle


Technical parameters: flaw detection sensitivity: from the workpiece surface to the metal extending depth ≥ 0.05mm, length ≥2 mm crack, defect; When the thickness of the metal between the top edge of the crack and the surface of the workpiece is ≤ 0.2mm, the crack with a depth of ≥0.20mm and a length of ≥ 1mm can be detected.

全自動車加工軸承渦流探傷分選機

電磁線圈上的磁場方向是向每個方位屈伸的。當超聲波無損探傷儀電磁線圈做到被檢測件邊沿時,因為邊沿數據信號的功效,渦旋產生變化,這就稱為邊緣效應。當檢驗電磁線圈貼近試樣的前因后果兩邊時,常稱之為尾端效用。當直流電流根據一圓柱體時,截面上的電流密度均同樣;而交流電流根據圓柱體時,截面無損探傷檢測儀器各部的電流密度就不一樣了,表面電流密度大,到圓柱體越小,這類狀況稱之為趨膚效應。金屬材料導體中通快遞以交變電流,交變電流的相對密度在導體橫截面上的遍布是以指數值規律性從表面向內部衰減的,其衰減律關系式以下:Jx=Joе-αx式中:x--從表面起算的;Jx--導體中為x處的電流密度;Jo--導體表面的電流密度;α--衰減指數為(πfuμσ)1/2,f是頻率,μ是導磁率,σ是導電率。上式表明,交替變化電流密度在導體截面上的衰減與交變電流的頻率、導體的導磁率、導電率等諸要素相關。

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