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Metal detection sensor and metal detection method using same

A metal detection and sensor technology, applied in the direction of the size/direction of the magnetic field, instruments, measuring devices, etc., can solve the problem of weakening the magnetic field of permanent magnets

Active Publication Date: 2018-02-16
EBARA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the detection coil is arranged at the center of the permanent magnet, there is also a problem that the magnetic field of the permanent magnet becomes weaker

Method used

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  • Metal detection sensor and metal detection method using same
  • Metal detection sensor and metal detection method using same
  • Metal detection sensor and metal detection method using same

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Embodiment Construction

[0072] Next, an embodiment of a foreign object detection system using a metal detection sensor according to an embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, the same reference numerals are attached to the same components.

[0073] figure 1 A schematic configuration of a foreign object detection system 10 using a metal detection sensor according to an embodiment of the present invention is shown. This embodiment will be described by taking the case where it is applied to the inspection of finished products of food or pharmaceuticals as an example. The finished product of this embodiment is in the shape of a powder or granules with a size of about 1 mm. A case where a metal is mixed into a powder as a product will be described as an example. Product is non-conductive. In addition, the present invention can also be applied to cases other than the case where the product is a powder or granule. For example, it can ...

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Abstract

Provided is a small-sized metal detection sensor capable of detecting a minute foreign metal substance by an electromagnetic induction detection method. The metal detection sensor 20 for detecting a metal 14 included in an inspection object moving on a path 18, includes: magnets 24, 26 which generate static magnetic fields; and a coil 30 which detects a magnetic field 28 generated by the metal 14.The magnets 24, 26 are positioned outside the coil 30 relative to the axial direction of the coil 30. The coil 30 is positioned outside the magnets 24, 26 relative to the axial direction connecting the N pole and the S pole of each of the magnets 24, 26. The magnets 24, 26 are opposed to the coil 30.

Description

technical field [0001] The present invention relates to a sensor and method for detecting metal foreign matter mixed in non-conductive materials such as pharmaceuticals, food, and industrial materials. In addition, the present invention relates to a sensor and method for detecting changes in thickness, size or shape of metal. Background technique [0002] Conventionally, the detection of metal foreign matter mixed in industrial materials, food, and other powders has been performed by, for example, an electromagnetic induction detection method. In this metal foreign object detection method, the fact that the magnetic field changes when the object to be inspected passes through the AC magnetic field generated by the excitation coil is utilized. When the detection coil detects a change in the magnetic field, it is determined that a metal foreign object has been mixed. The excitation coil used in the electromagnetic induction detection method is usually a coil that does not co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10
CPCG01R33/038G01V3/081G01V3/10G01N27/82G01R33/34053G01V3/104
Inventor 高桥太郎多田光男
Owner EBARA CORP
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