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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


Automatic big roller eddy current flaw detection and sorting machine

Automatic big roller eddy current flaw detection and sorting machine

  • Classification:Automatic big roller eddy current flaw detection and sorting machine
  • Number of visits:second
  • Date of issue:2021-04-24 10:14:56
  • 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.


全自動大滾子渦流探傷分選機

渦流的基本原理交流電路經線圈,在其周邊造成磁場(用磁力線表明),并對周邊的導體造成功效。因電磁線圈磁場是變化的,根據導體的磁場在方位和標值上面隨時間而變化。這時候,導體阻攔磁場變化造成電,稱之為電流的磁效應。導體中造成的靜電場,在變化的導體磁力線功效下造成電流量(交流電流),依據該電流量的形狀稱其為渦流。

造成于導體中的渦流,其尺寸與遍布狀況伴隨著頻率、導體的傳導率、透磁率,實驗體的規格、形狀,電磁線圈的形狀、規格、電流量及與導體的間距,測量儀器檢測及其機殼的形狀不一樣而變化。板塊產品工件表層如果有裂痕,渦流將曲折離去有裂痕的缺點區流動性(降低了電磁線圈的負荷),其結果使磁場變化。那樣有無裂紋等損害造成的導體特性的變化及渦流的遍布狀況隨著而變,渦流造成的磁力線也跟隨變化。因而數字式超聲波探傷儀要是檢驗出磁力線的變化,就能獲知是不是存有損害以及它導體的特性。


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