Inspection device

Abstract

The purpose of the present invention is to provide an inspection device which, irrespective of the passing position of an inspection target, does not have a dead zone, does not have a change in polarity of a detection signal waveform, and can consecutively perform inspection. The inspection device (100) is provided with: a transport path (101) in which the inspection target is transported at a moving velocity v; a first magnetic detector (111) and a second magnetic detector (112) which detect the magnetism of magnetic foreign matter included in the inspection target (10); an amplifying unit (120) which amplifies each of detection signals from the first magnetic detector (111) and the second magnetic detector (112); and a calculation processing unit (130) which multiplies a signal, obtainedby delaying the detection signal from the first magnetic detector (111), by the detection signal from the second magnetic detector (112). The first magnetic detector (111) and the second magnetic detector (112) respectively have magnetic sensors which are paired. One magnetic sensor MS1 of the first magnetic detector, which has a vertical magnetic field detection direction, is disposed at a height h from the transport surface, and one magnetic sensor MS2 of the second magnetic detector is disposed at a distance d from the magnetic sensor MS1.

Description

technical field [0001] The present invention relates to an inspection device for detecting foreign matter of a magnetic body contained in an inspection object conveyed on a conveyance path. Background technique [0002] In powder, granular raw materials, molded parts, and various packaged products, there is a risk of foreign matter being mixed in due to falling of fixings such as screws during the manufacturing process, and chipping of blades during the cutting process. When a large amount of objects to be inspected is conveyed continuously, a high-performance sensor is required to remove minute foreign matter mixed in. [0003] Conventionally, there are inspection methods such as optical inspection and X-ray fluoroscopy. However, there are packaging and transportation methods to which these methods cannot be applied. Therefore, a method of detecting foreign objects based on other principles has been sought. [0004] As one of the foreign object detection methods, there is ...

AI Technical Summary

Problems solved by technology

[0003] In the past, there were inspection methods such as optical inspection and X-ray fluoroscopy, but there were packaging and transportation methods that could not be applied to these methods, so a method of detecting foreign objects based on other principles was sought

[0004] As one of the foreign object detection methods, there is a method of detecting the residual magnetism of the magnetic foreign object moving in the conveyance path with a magnetic sensor, but when the size of the magnetic foreign object is small, the value of the residual magnetism becomes extremely small, so the detection become difficult, it is well known

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