JP2017058215A - Metal foreign matter detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal foreign matter detection device capable of detecting a metal foreign matter included in an inspection object formed by filling medical products, cosmetics, food products, or the like into a continuous package bag while eliminating the influence of the disturbance of an external magnetic field, electromagnetic wave, or magnetic field.SOLUTION: A metal foreign matter in an inspection object 2 including a packaged body filled into continuous package bodies that are continuously interconnected is detected by a sensor including a sensor coil. When the inspection object 2 passes through a hollow part 8 of a metal foreign matter detection device 1, vibrating means 20 relatively moves the inspection object 2 and the sensor. Therefore, in an environment in which an intermittent action conveyance of fast/slow in manufacturing the continuous package body is repeated, the presence or absence of a micro metal foreign matter in the inspection object 2 can be certainly detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a metal foreign object detection device that detects a metal foreign object mixed in an object to be inspected. In particular, the present invention relates to a metal foreign object detection device that detects a metal foreign object mixed in an inspection object filled in a non-metallic continuous packaging bag such as aluminum or a non-metal metal such as an aluminum vapor-deposited film, or a plastic resin film.

  Metal detection devices are used in various fields. A typical example is detection of metallic foreign matter mixed in a product in the product manufacturing process. Specifically, in the manufacturing process of foods, pharmaceuticals, etc., some containers, blades, sieves, etc., such as conveyors, washing machines, agitators, cutting machines, kneaders, steamers, etc. are subject to wear, metal fatigue, etc. In some cases, fragments due to peeling, breaking, peeling, shaving, chipping, etc., enter the product as foreign matter.

  It is important to detect these foreign substances and remove them from the product. An electromagnetic sensor coil or the like is used as a magnetic metal as means for detecting foreign matter mixed in a product to be inspected. The metal foreign matter is often austenitic stainless steel that constitutes the above-described various containers, blades, sieves, and the like. Austenitic stainless steel induces martensitic transformation when plastically deformed, and changes to a crystalline structure with weak magnetism.

  For this reason, a magnet booster is disposed in the vicinity of the sensor coil, and the metal foreign object is magnetized by the strong magnetic lines of force, so that the metal foreign object can be detected with high sensitivity. When the object to be inspected passes through the magnet booster, the magnetism generated by the magnet booster causes the magnetism of the metal foreign object to be magnetized in a certain direction. The applicants of the present invention have proposed the inventions described in Patent Documents 1 to 3.

  The devices described in Patent Documents 1 to 3 are for detecting metallic foreign matter in a detected object such as food, and succeeded in detecting a minute magnetic material that is metallic foreign matter using the proposed sensor coil. . Specifically, Patent Document 1 discloses a metal foreign object detection method and a metal foreign object detection device that detect a metal foreign object mixed in an object to be detected. According to the present invention, not only the metal foreign matter such as stainless steel mixed in the detected object is detected, but also the metal mixed in the detected object such as food, medicine, industrial material wrapped in conductive packaging material. Foreign objects can also be detected.

The metal foreign object detection device described in Patent Document 1 generates a minute magnetic field by a detection unit having one coil with a configuration in which a conductor is wound around a core, and detects a magnetic field detected from a metal object in response to the minute magnetic field, The detection signal is output as a detection voltage or detection current of the coil.
The small magnetic field is a voltage applied to the coil at a frequency of several hundreds of Hz to several tens of kHz, or a direct current, and a small amount of current is supplied, and the magnetization (BH) characteristic of the core constituting the coil is small. The non-linear portion where the magnetic flux density (B) and the magnetic field (H) are very small values near 0 is used.

  When the metal foreign object passes in the vicinity of the coil, the formation of magnetic force lines interlinking with the coil is disturbed, and the amplitude, phase, and frequency of the signal voltage are changed, thereby detecting the metal foreign object. This apparatus has an excellent sensitivity capable of detecting metallic foreign objects of 1 mm or less. Further, it is possible to detect an elongated metal object such as a needle in an aluminum package and an antioxidant made of metal powder. This metal detector sensor disclosed in Patent Document 3 is a metal detector sensor for detecting a metal object in an object to be detected, and is arranged in contact with a core to generate magnetic lines of force due to a static magnetic field. And a magnet for magnetizing the metal object.

  In Patent Document 3, an alternating magnetic field is generated when an AC voltage is applied to two pairs of sensor coils in which a copper wire coil is wound around an E-type iron core. At this time, two pairs of sensor coils are connected to form a balanced or unbalanced bridge circuit. As long as the alternating magnetic field is not changed, the output current of the bridge circuit is constant. When an object to be inspected containing a magnetic substance or a magnetized metallic foreign object passes between the upper and lower sides of two pairs of sensor coils generating an alternating magnetic field, the form (formation) of the magnetic field lines of the alternating magnetic field is disturbed.

  At this time, the current flowing through the sensor coil changes, and the output voltage of the balanced or unbalanced bridge circuit changes. Metal foreign matter can be detected by the change in the output signal voltage. The magnet magnet booster generates a strong magnetic field and magnetizes an object to be detected, and has a structure including a permanent magnet. Since the detection object passing near the magnet magnet booster is magnetized, the detection sensitivity is improved when detecting with the sensor coil.

  A metal detector disclosed in Patent Document 4 includes a conveyance path that conveys an object to be detected, a sensor coil that is provided in the middle of the conveyance path, and that has a coil wound around a core for generating a magnetic field by passing an electric current. The magnet is arranged in contact with the core. Specifically, an unequal static magnetic field is formed by the static magnetic field of the magnet and the alternating current of the sensor coil. When the object to be detected crosses this unequal magnetic field, the metal foreign object is temporarily magnetized, and at the same time, the magnetic field generated from the magnetized object to be detected disturbs the magnetic field linked to the sensor coil.

  The sensor coil sends out the disturbance of the magnetic field as a detection signal. Patent Document 5 discloses a metal foreign object detection device that detects a metal foreign object in a flowing continuous packaging bag before an accumulator that temporarily accumulates the continuous packaging bag. The metal foreign object detection device detects metal foreign objects using sensor coils disposed on both sides of the tubular guide through the continuous packaging bag through an elongated hollow tubular guide.

Japanese Patent No. 3857271 JP 2005-188985 A International Publication WO2003 / 027659 Japanese Patent No. 3875161 Utility model registration No. 3177557

  However, when the flow of the continuous packaging bag is stopped, the conventional detector cannot detect the metallic foreign matter present in the continuous packaging bag. Since the manufacturing system for manufacturing the product of the continuous packaging bag includes an accumulator for temporarily accumulating the continuous packaging bag and a winding process for winding the accumulator, it is discontinuous as a whole. For this reason, the products of the continuous packaging bags are manufactured in an environment where frequent intermittent operation conveyance is repeated frequently. When the flow of the continuous packaging bag is stopped, the metal foreign matter existing in the continuous packaging bag is not changed in the magnetic flux line across the sensor coil, so that the output of the sensor coil is not changed, and finally the metal foreign matter cannot be detected.

The present invention has been made based on the technical background as described above, and achieves the following objects.
An object of the present invention is to provide a metal foreign object detection device capable of detecting a metal foreign object contained in an object to be inspected in which a continuous packaging bag is filled with a filling such as pharmaceuticals, cosmetics, and foodstuffs.

In order to achieve the above object, the present invention employs the following means.
The metal foreign object detection device of the invention 1 of the present invention is
A detection unit for detecting the presence or absence of a magnetic substance in an inspected object packed in a continuous package in which packaged packages are continuously connected, and a signal processing of a detection signal output from the detection unit Then, in the metal object detection device comprising a detection means comprising a signal processing unit for determining the presence or absence of the magnetic material and outputting an output signal indicating the result of the determination,
The detection unit is composed of a sensor coil having a configuration in which a conductive wire is wound around a core.
When the continuous package passes in the vicinity of the sensor coil, the continuous package has an oscillating means for applying mechanical vibration to relatively move the continuous package and the sensor coil.

A metal foreign object detection device according to a second aspect of the present invention is the metal foreign object detection device according to the first aspect, wherein the vibration means moves the continuous package and the sensor coil relatively when the continuous package moves. It is characterized by moving in a direction perpendicular to the direction.
The metal foreign matter detection device of the invention 3 of the present invention is the metal foreign matter detection device of the invention 1 or 2,
The vibration means comprises a driving means, a rotating body arranged in contact with the continuous package, and a rotating shaft for transmitting the rotational movement of the driving means to the rotating body,
A section of the rotating body in a plane perpendicular to the rotation axis of the rotating shaft has one shape selected from an elliptical shape, a polygonal shape, a groove cam, and a cylindrical cam.

The metal foreign object detection device of invention 4 of the present invention is the metal foreign object detection device of invention 1 or 2,
The detection unit is composed of two sensor coils, a first sensor coil and a second sensor coil, and magnetizing means composed of an elongated first booster and a second booster,
The first sensor coil and the first booster are arranged in contact with one side surface of the first housing in parallel,
The second sensor coil and the second booster are arranged in contact with one side surface of the second housing in parallel,
The first casing and the second casing have a gap through which the continuous package passes, and are opposed to the side surface where the first sensor coil and the second sensor coil are in contact with each other. Parallel to each other, and the first sensor coil and the second sensor coil are arranged so that the first booster and the second booster are parallel,
Both sides of the first housing and the second housing are fixed by connecting plates,
The gap through which the continuous package passes is provided with a guide having a hole larger than the width of the continuous package in front.

  The detection principle of the detection unit described above is that a magnetic field is generated by applying a voltage or supplying a current to at least one sensor coil and responding to the magnetic field from a metallic foreign object in the inspection object. The detection magnetic field is detected as a detection voltage or a detection current of the sensor coil, and a detection signal is output. The detection signal is analyzed to identify the metal foreign object. The detection voltage or detection current of the sensor coil is a minute value and is easily affected by external magnetic field or magnetic field disturbance. Shield.

The minute magnetic field has a small voltage applied to the sensor coil or a supplied current, and among the magnetization (BH) characteristics of the core constituting the sensor coil, the magnetic flux density (B) representing the magnetization characteristic and the magnetic field ( H) uses a non-linear part having a minute value near 0, and the current or voltage is a frequency of several hundred Hz to several tens kHz or direct current, and when a metal foreign object passes near the sensor coil, A voltage and current flowing in the sensor coil are induced. It can also be said that the frequency of the sensor coil changes.
The minute magnetic field of the sensor coil is a known technique as shown in Japanese Patent No. 3857271 and the details are omitted.

  The applicant of the present invention has filed a patent application relating to “a method for detecting a metal foreign object and its apparatus” and has obtained Japanese Patent No. 3857271. All or part of the content of this patent is also included in the present invention. In this metallic foreign matter detection method, in order to detect metallic foreign matter mixed in the process of manufacturing the detected object in the package, a transporting process for transporting the detected object on the transport path, and in the middle of the transport path In a metal foreign object detection method comprising: a metal foreign object detection step for detecting a metal foreign object mixed in the detected object by generating a magnetic field by a detection unit provided with a coil having a configuration in which a conductor is wound around a core. , Applying a voltage to one coil or supplying a current to generate a minute magnetic field, and detect and detect a magnetic field detected from the metal foreign object in response to the minute magnetic field as a detection voltage or a detection current of the coil A detection signal output step of outputting a signal, and a signal analysis step of analyzing the detection signal to analyze the signal in order to identify the metal foreign matter, and the minute magnetic field is applied to the coil. The magnetic flux density (B) and magnetic field (H) representing the magnetization characteristics are close to 0 out of the magnetization (BH) characteristics of the core constituting the coil. The current or voltage is a frequency of several hundreds of Hz to several tens of kHz, and the frequency changes when the metal foreign object passes near the coil. It is characterized by being.

  In the metal foreign object detection device of the present invention, the current supplied to the sensor coil or the applied voltage is not limited to the above-mentioned frequency, but supplies an alternating current from a direct current to several hundred Hz. Even if the sensor coil is not actively supplied with current or applied with a voltage, a bias voltage of the amplifier is applied to detect the metallic foreign matter of the magnetic material. The metallic foreign object detection device of the present invention can detect a magnetic substance in an object to be detected that is a non-metallic object with high sensitivity. Furthermore, a magnetic substance in an object to be detected having a packaging bag / container packaged with a conductive material such as aluminum or aluminum alloy can be detected.

According to the present invention, the following effects can be obtained.
Even if the flow of the continuous packaging bag stops, the metal foreign object detection device of the present invention can detect and detect the metal foreign material filled therein by moving the continuous packaging bag relative to the sensor coil.

In the metal foreign object detection device of the present invention, the magnet booster is composed of magnet elements, and the magnet elements arranged opposite to each other are arranged so that the same magnetic poles are opposed to each other.
The metal foreign object detection device of the present invention makes it possible to reliably detect the presence or absence of a minute metal foreign object in an environment in which fast / slow intermittent operation conveyance is repeated in the production of a continuous package.

FIG. 1 is an external view showing an external appearance of a metal foreign object detection device 1 according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing an outline of a side surface of the metallic foreign object detection device 1 according to the embodiment of the present invention, and is a side view of FIG. FIG. 3 is a conceptual diagram showing an outline of the front of the metallic foreign object detection device 1 according to the embodiment of the present invention, and is a front view of FIG. FIG. 4 is a conceptual diagram showing an example of a system that uses the metal foreign object detection device 1 according to the embodiment of the present invention and manufactures a continuous packaging bag filled with an inspection object 2. 5A and 5B are diagrams showing a configuration example of the sensor coil of the sensor 5, FIG. 5A is a front view of the sensor coil, FIG. 5B is a plan view of FIG. 5A, and FIG. ) Is a cross-sectional view taken along line AA of FIG. FIG. 6 is a diagram illustrating an arrangement example of the sensor 5. 7 is a diagram illustrating the structure and arrangement of the magnet booster 6. FIG. 7A is a front view of the magnet booster 6, and FIG. 7B is a plan view of the magnet booster 6 in FIG. 7A. FIG. 7C is a diagram illustrating an arrangement example of the magnet booster 6. FIG. 8 is a diagram illustrating an example of the cross-sectional shape of the rotating body 21. FIG. 8A is a cam-like cross section, FIG. 8B is a square cross-section, and FIG. 8C is a triangular cross-section. FIG. 8D is a diagram illustrating an example in which the cross section has an elongated shape. FIG. 9 is a functional block diagram illustrating a configuration example of the signal processing unit 7 of the metal foreign object detection device 1. FIG. 10 is a block diagram illustrating a configuration example of the digital computer processing unit 52 of the signal processing unit 7. FIG. 11 is a flowchart illustrating an operation example of the digital computer processing unit 52 of the signal processing unit 7. FIG. 12 is a conceptual diagram illustrating another installation example of the metal foreign object detection device 1 according to the first embodiment of this invention.

Embodiment
FIG. 1 is an external view illustrating the external appearance of a metal foreign object detection device 1 according to an embodiment of the present invention. FIG. 2 is a conceptual diagram illustrating an outline of a side surface of the metal foreign object detection device 1 of FIG. FIG. 3 is a conceptual diagram illustrating an outline of the front of the metal foreign object detection device 1 of FIG. The metal foreign object detection device 1 is for detecting or detecting a metal object (magnetic substance foreign substance) in the inspection object 2 and notifying it.

  In particular, the metal foreign object detection device 1 is particularly for detecting or detecting a metal foreign object mixed in an object to be inspected 2 composed of an object to be inspected that is filled or built in a continuous packaging bag. Although it does not specifically limit as a to-be-inspected object, Solid, liquid, or a gel-like foodstuff, the pharmaceutical with which the packaging bag was filled, etc. can be illustrated. The continuous packaging bag is a packaging bag continuously connected in the form of a single layer or a multilayer film. The packaging material of a continuous packaging bag consists of a well-known aluminum foil, a synthetic resin film, paper, etc., and a laminated material combining these materials.

[Configuration of Metal Foreign Object Detection Device 1]
The metal foreign object detection device 1 includes a housing 3, a guide 4 for guiding the inspection object 2, a sensor 5 for detecting a magnetic body in the inspection object 2, and a magnet booster that magnetizes the magnetic body in the inspection object 2. 6 includes a signal processing unit 7 that performs signal processing on the detected signal, and an excitation unit 20 that applies mechanical vibration to the inspection object 2. The housing 3 is a box-shaped case for housing the sensor 5, the magnet booster 6, the signal processing unit 7, and the like.

  The housing 3 has a hollow portion 8 penetrating from the upper surface to the bottom surface in the middle thereof, and the inspection object 2 passes through the hollow portion 8. In the example of the present embodiment, the hollow portion 8 has a rectangular shape at the inlet and outlet. The guide 4 is fixed to the inlet of the hollow portion 8. The guide 4 is fixed to the front surface of the hollow portion 8 of the housing 3, and the inspection object 2 passes through the guide 4. As shown in FIG. 1, the guide 4 has a quadrangular shape with one side open, in other words, a U-shape.

  In the example of the present embodiment, the hole in the central portion of the guide 4, in other words, the inside of the U-shape has a size larger than the width of the inspection object 2. The guide 4 is for guiding the object to be inspected 2 and may be a plate having a hole in the center. The guide 4 is made of a material such as stainless steel, aluminum alloy, copper, or synthetic resin, and the type thereof is appropriately selected according to the type and use of the packaging bag of the inspection object 2. Sensors 5 having the same structure are arranged on both sides of the hollow portion 8 so as to face each other (detailed description will be described later).

  Similarly, magnet boosters 6 having the same structure are arranged on both sides of the hollow portion 8 (detailed description will be described later). The sensor 5 includes a sensor coil. The sensor coil detects a change in the surrounding magnetic field. A magnetic field generated from a magnetic metal such as a metal object or a metal foreign object in the inspection object 2 changes the surrounding magnetic field. In other words, the sensor 5 is for detecting a change in the disturbance of the surrounding magnetic field, and outputs a voltage or current detection signal corresponding to the change in the magnetic field.

  In the present embodiment, the housing 8 is made of stainless steel from the viewpoint of rust prevention or the like. Within the housing 3, the magnet booster 6 and the sensor 5 are arranged in this order along the flow of the inspection object 2. The inspected object 2 is an object to be inspected such as juice, paste, etc., individually packaged in aluminum packaging or the like, sealed and connected, and is continuously transported. The inspection object 2 passes through the guide 4, the magnet booster 6, and the sensor 5 in this order. The detection signal detected and output by the sensor 5 is subjected to signal processing by the signal processing unit 7.

  The signal processing unit 7 analyzes the detection signal received from the sensor 5 and determines whether there is a magnetic substance in the inspection object 2. The signal processing unit 7 notifies the result of this determination (electric signal, warning sound, display, etc.). The metal foreign object detection device 1 has a hollow pipe 9 installed through the housing 3. The pipe 9 is made of a metal such as stainless steel. An electric wire passes through the pipe 9 and is taken out from a hole (not shown) in the middle of the pipe 9 to supply power to the sensor 5, the signal processing unit 7, and the like. Used.

  The pipe 9 can be used when the metallic foreign object detection device 1 is fixed to an installation table or the like. If the inspection object 2 contains a magnetic material, the signal processing unit 7 outputs an output signal to that effect. This output signal is transmitted from the signal processing unit 7 to a signal tower 27 (see FIG. 4) provided in the metal foreign object detection device 1 or a subsequent device. The signal tower 27 emits an alarm signal such as lighting, blinking, sounding a buzzer, or issuing a missing part detection signal to an operator when a missing part (metal foreign matter) is detected.

  For example, the signal tower normally shines in a specific color, such as green, and emits another color, such as red, when an alarm signal is issued. Examples of the subsequent device that receives an output signal from the signal processing unit 7 include a marker device (see FIG. 12) for marking the inspection object 2, a production line management computer, a factory management control computer, An example is an administrator's computer.

  The signal processing unit 7 does not need to be built in the housing 3 as in this example, and can be installed in any location as long as it can receive and process a detection signal from the housing 3 by wired communication or wireless communication. You may do it. As the communication method of the wired communication and the wireless communication, any known communication standard can be used, and since it is not the gist of the present invention, detailed description thereof is omitted. The vibration means 20 is for moving the inspection object 2 and the sensor 5 relatively, and details will be described later.

[Arrangement of metallic foreign matter detection device 1]
FIG. 4 is a conceptual diagram showing a system that manufactures a continuous packaging bag filled with an inspection object 2 using the metal foreign object detection device 1, and in a series of processes for manufacturing the inspection object 2, the metal foreign object It is the figure which illustrated the example which installed the detection apparatus. The metal foreign object detection device 1 is disposed in a conveyance path through which the inspection object 2 is conveyed. In this example, the metal foreign object detection device 1 is disposed between the continuous packaging process 30 and the inspection process 40.

  The inspected object 2 is packed in the continuous packaging bag 2 e with the inspected object in the continuous packaging process 30, and accumulated in the accumulation 31. The metal foreign object detection device 1 is installed at the outlet of the continuous packaging process 30. The accumulator 31 is a container for temporarily storing the inspection object 2 made of the inspection object filled in the continuous packaging bag 2e. The inspection object 2 is guided from the continuous packaging process 30 of the previous process, flows in a continuous packaging bag state, passes through the hollow portion 8 of the metal foreign object detection device 1, and is accumulated in the accumulator 31. .

  As shown in FIG. 4, the metal foreign object detection device 1 is mounted on an upper portion of a frame 11 with legs 11 a installed on the floor surface. The inspection object 2 is fed by a feeding mechanism such as gravity or a roller 12 and is conveyed while sliding, passes through the vibration means 20 and the guide 4, and passes through the hollow portion 8 (see FIG. 2). When the inspection object 2 is a large object, particularly heavy, a plurality of rollers (not shown) may be provided, and the inspection object 2 may be slid thereon. The object 2 to be inspected is taken out from the accumulator 31 and conveyed to a subsequent process such as an inspection process 40, a winder or a packaging process. In this example, the inspection process 40 is illustrated as an example of a subsequent process.

  A hopper 32 is installed on the upper part of the continuous packaging process 30. The hopper 32 is a known device that temporarily stores an object to be inspected and supplies it to the continuous packaging process 14. In the continuous packaging process 30, the continuous packaging bag 2 e is filled with the test object supplied from the hopper 32 by the continuous packaging apparatus 33 and packaged. In FIG. 4, the continuous packaging bag 2 e is wound in a roll shape and installed on the upper part of the continuous packaging device 33. The continuous packaging bag 2e is continuously wound up as necessary and supplied to the continuous packaging device 33, and each of the bags is continuously filled with an object to be inspected to produce an object 2 to be inspected. Is done.

  The inspected object 2 discharged from the continuous packaging apparatus 33 is finally supplied to the consumer, and metal foreign objects should not be mixed therein. For this reason, the metal foreign object detection device 1 according to the present embodiment is installed at a location subsequent to the continuous packaging process 30 and inspects foreign substances in food such as continuously packaged food. On the control panel 34, the operation status of the continuous packaging process 30 and the operational status of the continuous packaging apparatus 33 are displayed and controlled. For example, the filling amount and filling time of the object to be inspected in the continuous packaging apparatus 33 are controlled.

  Since the gist of the present invention is not the continuous packaging process 30, further detailed description is omitted. In the present embodiment, the metal foreign object detection device 1 is installed between the continuous packaging process 30 and the accumulator 31, particularly immediately after the discharge port of the continuous packaging process 30, and the inspection object of the continuous packaging bag 2 is inspected. If the metal foreign object detection device 1 is installed immediately before the accumulator 31, it is convenient to take out the inspected object 2 mixed with foreign matter from the accumulator 31 and remove it when the foreign object is mixed into the inspected object 2.

  However, the arrangement position of the metal foreign object detection device 1 is not limited to this position. The metal foreign object detection device 1 can be installed between the accumulator 31 and the next process, and substantially the same detection can be performed even with this arrangement. Moreover, the metal foreign material detection apparatus 1 can also be arrange | positioned in the back | latter stage of an inspection process. The inspection step 40 is a step for inspecting whether or not the filling amount of the inspection object filled in the inspection object 2 is appropriate. The inspection object 2 discharged from the inspection process 40 is accumulated in the accumulator 41 and carried out to the next process.

  The inspection of the inspection object 2 is performed by the inspection device 42 and displayed on the control panel 43. The inspection object 2 is continuously taken out from the accumulator 31 and supplied to the inspection device 42 through the roller 44. The inspection device 42 inspects whether the thickness, width, etc. of the inspection object 2 are appropriate. Since the gist of the present invention is not the inspection process, further detailed description is omitted. When the metal foreign object detection device 1 determines that there is a metal foreign object in the object to be inspected 2, for example, a signal to this effect issues an alarm signal from the signal tower 27 with a buzzer or an optical signal.

  In response to this warning signal, the worker removes all or a part of the inspection object 2 accumulated in the accumulator 31 by cutting from both sides of the inspection object 2. As another example, when the metal foreign object detection device 1 determines that there is a metal foreign object in the inspection object 2, a signal to that effect is transmitted to the marker device 28 shown in FIG. The marker device 28 marks the surface of the bag of the inspection object 2. Later, the bag with this mark is cut by an operator or a dedicated machine and removed.

  The marker device 28 is a device that irradiates and marks the packaging bag of the inspection object 2 with a laser, for example. Further, the marker device 28 may be an ink jet device that ejects ink to a packaging bag of the inspection object 2 and performs marking. These marking means are publicly known, and description of their structure and function is omitted. The metal foreign object detection device 1 includes a control unit 26 for performing the operation status and adjustment. The control unit 26 is connected to the metal foreign object detection device 1 and displays the presence / absence of a foreign object in the inspection object 2 and displays the inspection time, inspection sensitivity, and the like.

[Sensor coil]
As shown in FIG. 2, the sensor 5 of the metal foreign object detection device 1 includes two sensor coils having the same structure. Both sensors 5 are arranged on the left and right with the hollow portion 8 in between. The sensor 5 has an elongated shape and is disposed so as to face two parallel surfaces. The inspection object 2 passes through the space between the sensors 5 arranged to face each other. Each side other than the entrance and exit of the hollow portion 8 becomes a metal plate and constitutes a part of the housing 3.

  Therefore, the space between the two sensors 5 opposed to each other is partitioned by a metal, in this example, a stainless steel wall plate, and the inspection object 2 passes between them. The two sensor coils of the sensor 5 are arranged vertically on the surface parallel to the upper and lower surfaces with the hollow portion 8 interposed therebetween. Of the magnetization (BH) characteristics of the sensor coil, a metal object is detected using a non-linear portion where the magnetic flux density (B) representing the magnetization characteristics and the magnetic field (H) are very small values near zero. The technical idea about this magnetization characteristic and its utilization method is described in detail in Patent Document 1.

  All or part of the invention described in Patent Document 1 has substantially the same structure and circuit as the present invention, and these constitute the present invention. However, the voltage, current, and frequency applied to the sensor coil may be all or part of values different from those in Patent Document 1 in the embodiment of the present invention. Even if no current is supplied to the sensor coil and no voltage is applied to the sensor coil, it is possible to detect a metallic foreign object in the magnetic material. For example, an amplifier bias voltage is applied to the sensor coil.

  As a result, the input bias current of the amplifier flows through the coil of the sensor coil. In addition, when the magnetic flux crossing the sensor coil changes with the change of the peripheral magnetic field, the current and / or voltage flowing through the sensor coil changes to become an output signal. When an AC power supply of several kHz is applied to the sensor coil, an alternating magnetic field is generated in the sensor coil. When a fine stainless steel fragment approaches the vicinity of the sensor coil, the stainless steel fine particle is magnetized and generates a magnetic pole by the action of a static magnetic field.

  For example, in austenitic stainless steel (SUS304, etc.), a portion having weak magnetism caused by martensite-induced transformation due to plastic deformation such as rupture, crushing, bending, chipping, etc. is magnetized by the action of a static magnetic field. Cause it to occur. This change in the magnetic pole affects the alternating magnetic field, and this is detected by a detection circuit including a sensor coil. In particular, since this effect becomes more significant as the inspection object 2 gets closer to the sensor coil, it is possible to reliably detect the metallic foreign matter of the minute fragments in the inspection object 2 with the sensor coil.

  Examples of the magnetic material mixed as foreign matter in the inspection object 2 include ferromagnetic materials such as iron, nickel, and cobalt, alloys thereof, martensitic stainless steel, and the like. When the pair of sensor coils are arranged on two sides of the bridge circuit, when a constant AC voltage is applied, the current flowing through the bridge circuit composed of the sensor coils does not change, and the output current of the bridge circuit is constant. As the magnetic material passes in the vicinity of the sensor coil, the form of the alternating magnetic field is disturbed and the output current of the bridge circuit changes. This output current is signal-processed by the signal processing unit 7 at the subsequent stage and detected as a foreign substance in the inspection object 2.

  FIG. 5 illustrates the sensor coil structure of the sensor 5. 5A is a front view of the sensor coil, FIG. 5B is a plan view of the sensor coil of FIG. 5A, and FIG. 5C is a cross-sectional view taken along line AA of FIG. FIG. The sensor coil is basically the same in the shape of an elongated bar as shown in FIG. The sensor coil has a configuration in which a coil 102 is wound along a groove portion of an iron core 101 of a conductive material having an elongated bar shape and an E-shaped cross-sectional structure.

  The iron core 101 is configured by laminating silicon steel plates or amorphous plates. Alternatively, a ferrite core, a permanent magnet, or the like may be used for the iron core 101. When AC power is applied to the sensor coil, an alternating magnetic field is generated around the sensor coil. When the magnetic material passes through this, the alternating magnetic field is disturbed, and the current flowing through the sensor coil changes. The sensor coil of the present invention can detect a metal foreign object of 1 mm or more, but is mainly used to detect a minute metal of 1 mm or less.

  FIG. 6 illustrates an arrangement example of the sensor 5. The two sensor coils of the sensor 5 are arranged with the coil sides of the E-type iron core 101 facing each other. This is configured as described above in order to detect the upper and lower parts of the inspection object 2 with high sensitivity. Further, by providing two sensor coils, even if the detection object 2 in the hollow portion 8 moves to the hollow portion 8, it is detected by a sensor coil close to it and detected with high sensitivity. Metal foreign matter in the inspection object 2 can be detected with only one sensor coil.

[Magnet booster]
The magnet booster 6 of the metal foreign object detection device 1 according to the first embodiment of the present invention is for magnetizing a magnetic body in the inspection object 2 or for enhancing the magnetization, and is made of a permanent magnet. The magnet booster 6 is installed in front of the sensor 5 (on the supply side) in terms of the conveyance direction of the inspection object 2. When viewed in the conveyance direction of the inspection object 2, the inspection object 2 passes through the guide 4 and passes through the magnet booster 6 and the sensor 5 in this order.

  In the present embodiment, the magnet booster 6 is installed in the housing 8 installed around the center of the guide 4, specifically, near the hollow portion 8. The installation position of the magnet booster 6 is not limited to this position. The magnet booster 6 can be composed of one permanent magnet or a plurality of two or more permanent magnets. In this example, the magnet booster 6 is composed of a plurality of permanent magnets 6a.

  FIG. 7 shows an example of the structure and arrangement of the magnet booster 6. 7A is a front view of the magnet booster 6, FIG. 7B is a plan view of the magnet booster 6 in FIG. 7A, and FIG. 7C is a diagram illustrating an arrangement example of the magnet booster 6. . The magnet booster 6 has two elongated magnet boosters 6 arranged at right angles to the conveying direction of the inspection object 2, in other words, in the cross-sectional direction of the inspection object 2. It arrange | positions so that the axis line of the longitudinal direction of the magnet booster 6 may orthogonally cross with respect to the conveyance direction of the to-be-inspected object 2. FIG.

  The two magnet boosters 6 are arranged on both sides of the inspection object 2 with the magnetic poles of the magnet elements 6 a facing the inspection object 2. The magnet element 6a of each magnet booster 6 and the magnet element 6a opposite to the magnet element 6a have the same magnetic pole directed toward the object 2 to be inspected. As shown in FIG. 6C, the magnetic pole element 6a and the magnetic pole element 6a 'are arranged with the same magnetic pole N facing each other. All the magnetic pole elements adjacent to the magnetic pole element 6a and the magnetic pole element 6a 'are arranged with the same magnetic pole N facing each other.

  In this example, the N magnetic pole of the magnet element 6a is arranged to face the object 2 to be inspected, but the same effect can be obtained even if the S magnetic pole is used instead of the N magnetic pole. Thus, when the same magnetic poles are arranged so as to face each other, repulsion between the magnetic poles is strong, and the function of magnetizing the metal foreign matter in the inspection object 2 is strong. The magnet booster 6 is composed of a plurality of magnet elements 6a made of neodymium magnets. Thus, by using a strong magnet such as a neodymium magnet, the range in which the magnetic field of the permanent magnet affects the magnetic material can be greatly expanded, and the detection sensitivity of the sensor 5 can be improved.

[Excitation means]
As shown in FIGS. 2 and 3, the vibration means 20 includes a rotating body 21, a rotating shaft 23, a motor 24, and the like. The rotating body (cam) 21 is a kind of lift cam in this example, and is fixed on the rotating shaft 23 and arranged in contact with the continuous package. The motor 24 has its rotor connected to one end of the rotary shaft 23 and fixed. When the motor 24 is driven to rotate, the rotary motion is transmitted to the rotary body 21 via the rotary shaft 23, and the rotary body 21 rotates. do.

  The rotating shaft 23 is rotatably supported by the bearing 22, and the bearing 22 is fixed to the housing 3. The motor 24 is fixed to a motor fixing flange 24 a fixed to the bearing 22. The rotating body 21 is disposed in contact with the inspection object 2. In this example, the rotation shaft 23 is supported by the bearing 22. The bearing 22 is fixed to the housing 3 in this example. However, the bearing 22 may be fixed to another support frame or the like without being fixed to the housing 3. In FIG. 2, the reference number 2 c indicates the conveyance direction of the inspection object 2.

  Since the rotating body 21 basically rotates in the conveyance direction of the inspection object 2, as shown in FIG. 2, it rotates in the direction indicated by the arrow of reference numeral 21a. The rotating body 21 can rotate in the direction opposite to the conveyance direction of the inspection object 2. In this case, the surface friction between the packaging bag of the inspection object 2 and the rotation body 21 causes the conveyance direction of the inspection object 2. It becomes larger than the rotation of. Therefore, it is preferable that the rotating body 21 rotates in the conveyance direction of the inspection object 2. The rotating body 21 is in contact with the inspection object 2, and the inspection object 2 is always in contact with the rotating body 21 during rotation.

  Therefore, if the rotator 21 has an asymmetric cross section, the object to be inspected 2 moves in such a manner as to approach the rotation axis of the rotator 21 and move away. For example, in the example shown in FIG. 2, the cross section of the rotating body 21 has an arc cam shape. The arc cam shape is a shape in which a space between the base circle and the cam top 21 is an arc. The position of the cam top is indicated by reference numeral 21b. The rotating body 21 rotates, and the cam top rotates from the position of the solid line 21b to the position of the broken line 21c.

  In this case, the inspection object 2 moves from the position of the solid line 2a to the position of the broken line 2b, and vibrates left and right by the cam lift amount (difference between the cam height and the cam short diameter). When the rotating body 21 further rotates and the cam top returns to the position of the solid line 21b, the inspection object 2 returns to the position of the solid line 2a. Thus, as indicated by the arrow 2d, the position of the inspection object 2 in the hollow portion 8 reciprocates. As a result, the two sensors 5 and the inspection object 2 move relatively. Even if the conveyance of the inspection object 2 is stopped, the relative movement between the sensor 5 and the inspection object 2 continues when the rotating body 21 is rotating.

  Since the sensor coil of the sensor 5 detects the foreign matter by the change of the magnetic field, there is a disadvantage that the metallic foreign matter cannot be detected in the situation where the inspection object 2 is stopped. In the present invention, the sensor 5 and the object 2 to be inspected are always relatively moved, and this disadvantage is not satisfied. As described above, the rotating body 21 has been described as a cam. FIG. 8 illustrates an example of a cross-sectional shape of the rotating body 21 that is a cam.

  8A shows an arc cam-like rotating body 21 having a cross-sectional shape of an arc and an ellipse, FIG. 8B shows a rotating body 21 having a quadrangular section, and FIG. A body 21 (triangular cam), FIG. 8 (d) shows a rotating body 21 having a narrow cross section (a kind of ellipse). In addition to the shape of the example of FIG. 8, the rotating body 21 may have a shape such as a heart-shaped cam, a tangential cam, a disc cam, a groove cam, and a cylindrical cam. The middle hole in the cross-sectional views of FIGS. 8A to 8D is a hole through which the rotation shaft 23 is fixed. The shape of the cross section of the rotator 21 and the shape of the rotator 21 are not limited to the examples in FIGS. 2 and 8, and may be any as long as the sensor 5 and the inspection object 2 are moved relatively. A rotating body 21 having a shape can be used.

[Configuration Example of Signal Processing Unit 7]
FIG. 9 illustrates an outline of the signal processing unit 7. The signal processing unit 7 includes an amplification / filter circuit 50, a waveform processing unit 51, a digital computer processing unit 52, a signal output unit 53, and the like. The sensor coil of the sensor 5 is connected to the amplification / filter circuit 50. The signal output from the sensor coil of the sensor 5 is amplified by the amplification / filter circuit 50 and output to the waveform processing unit 51.

  The waveform processing unit 51 shapes the waveform of the input signal, converts it into a digital signal, adjusts the reception sensitivity, and outputs it to the digital computer processing unit 52. At this time, threshold processing is performed on the signal converted into the digital signal to adjust the reception sensitivity. The digital computer processing unit 52 receives the digital signal from the waveform processing unit 51 and processes the signal, and determines the presence or absence of a magnetic substance contained in the inspection object 2. The digital computer processing unit 52 outputs an output signal to the signal output unit 53 when it is determined that a magnetic material has been detected.

  The sensor 5 is directly connected to the electronic circuit of the amplification / filter circuit 50. A bias voltage by a DC bias circuit for operating the amplifier of the amplification / filter circuit 50 is applied to the sensor 5. Thereby, the sensor coil of the sensor 5 is excited, and the magnetic flux of the static magnetic field generated by the magnet booster 6 is always linked to the sensor coil. A weak DC fluctuation current always flows through the coil due to fluctuations in the bias voltage applied to the sensor coil of the sensor 5 and disturbance in the external magnetic field.

  That is, an alternating current having a frequency of the commercial power source, an alternating current having a multiple of the alternating current, and an alternating current having a frequency superimposed with an external environmental magnetic field flow while being minute. When the inspection object 2 is transported (continuously flows) in the vicinity of the sensor coil in such an excited state, the magnetic metal foreign matter contained in the inspection object 2 is magnetic dipole-like (N pole and S) with a magnet booster. Magnetized by a pair of small magnets). The sensor coil outputs a minute foreign object signal due to the magnetic metal foreign object.

  Specifically, a weak induced voltage as described by Lenz's law is generated in the sensor coil. The foreign substance signal is amplified by the amplification / filter circuit 50 (gain amplifier) and output to the waveform processing unit 51 and the digital computer processing unit 52. The amplification / filter circuit 50 amplifies the output of the sensor coil to several tens to several hundreds of dB, and in some cases, 1000 dB or more. In this example, it is amplified by about 120 dB.

[Outline of Digital Computer Processing Unit 52]
FIG. 10 is a block diagram showing an outline of the digital computer processing unit 52. The digital computer processing unit 52 is a signal processing unit including a memory 111, a central processing unit (CPU) 112, an input interface 113, an output interface 115, an input device 114, a display 116, and the like. The memory 111, the CPU 112, the input interface 113, and the output interface 115 are connected to each other via a bus 110 and transmit / receive data via the bus 110.

  The display 116 is connected to the digital computer processing unit 52 as necessary to display the output and operation status of the digital computer processing unit 52. In the example illustrated in FIG. 1, there is no display 116. As shown in FIGS. 4 and 12, the control unit 26 becomes a digital computer processing unit 52 having a display 116. The memory 111 is a storage device such as a ROM or a RAM.

  The digital computer processing unit 52 executes a program stored in the memory 111 by the CPU 112 and determines a metal foreign object in the inspection object 2. In particular, this program causes the central processing unit 112 to execute each step of the flowchart shown in FIG. The digital computer processing unit 52 can be realized by circuit means composed of an analog circuit or a digital circuit having the same function, but detailed description thereof is omitted here.

  The CPU 112 controls the operation of the digital computer processing unit 52, and controls the operation of the digital computer processing unit 52 by a calculation program stored in the memory 111. The input device 114 is connected to the input interface 113. The input device 114 is an input device such as a mouse, a keyboard, or a touch panel. An administrator of the metal foreign object detection device 1 operates this input device 114 to initialize and set the metal foreign object detection device 1.

  An administrator or the like can also input data for a calculation program from the input device 114. The calculation program is stored in the memory 111. The calculation program is stored in the ROM of the memory 111. Alternatively, the calculation program is stored in an auxiliary storage device (not shown). In this case, the calculation program is called from the auxiliary storage device, expanded in the memory 111, and operates. The digital computer processing unit 52 has an output interface 115 for connecting a display device.

  For example, a display device such as a display 116 is connected to the output interface 115. The digital computer processing unit 52 has an external interface 118 for connecting an external device 119, a signal output unit 53, and the like. The signal output unit 53 transmits the output signal of the digital computer processing unit 52 to an appropriate device or apparatus. For example, it transmits to the signal tower 27 (refer FIG. 4), the marker apparatus 28 (refer FIG. 12) for marking to the to-be-inspected object 2, etc.

[Magnetic detection flow]
FIG. 11 is a flowchart when the digital computer processing unit 52 detects a magnetic material. In the digital computer processing unit 52, the magnetic substance (metal foreign matter) in the non-detected object 2 is determined. First, the digital computer processing unit 52 acquires the transport speed Vb at which the inspection object 2 is transported, and stores it in the memory 111 (step 10). The transport speed Vb is preferably a value stored in advance in the memory 111 or a standard value.

  Since the inspection object 2 is continuously manufactured on the manufacturing line of the inspection object 2, the inspection object 2 is basically conveyed at the same conveyance speed. Therefore, the conveyance speed Vb is set in advance and stored in the memory 111. Alternatively, the administrator can input the conveyance speed Vb from the input device 114 or the like. The digital computer processing unit 52 receives the detection signal of the sensor 5 from the waveform processing unit 51 and stores it in the memory 111 (step 11). And the time t1 which received the detection signal of the sensor 5 is acquired, and it stores in the memory 111 (step 12).

  From these values, the position of the magnetic material is calculated (step 13). Then, the detection signal received from the sensor 5 is subjected to waveform analysis and compared with standard data (comparison waveform) to determine whether the detection signal is a detection signal indicating a metal structure (steps 14 and 15). The metal structure included in the object to be inspected 2 has a uniform size and material. Therefore, the detected waveform is basically the same pattern for each type of metal structure. Therefore, the waveform of a metal structure that is included in the inspection object 2 and is known in advance is measured in advance and stored in the memory 111.

  Specifically, the standard data serving as a reference for the foreign substance signal waveform is compared with the detection signal output from the sensor 5, and the metallic foreign substance is identified based on how similar the standard data and the detection signal are. This is a kind of pattern matching. In this comparison, comparison items such as the amplitude of the detection signal waveform, the number of peaks, the magnitude relationship between peaks before and after the waveform of the detection signal being compared, the frequency difference, the integral value, and the differential value are compared with the standard data. Then, the difference amount is calculated. However, in this comparison, the detection signal and the standard data rarely match perfectly.

  The detection signal and the standard data are determined to be metal foreign objects when the value of the predetermined comparison item matches the standard data at a predetermined value or more, for example, 75% or more. Therefore, the detection signal is subjected to waveform analysis in step 14 described above and compared with standard data (comparison waveform) to determine whether or not the detection signal is a detection signal indicating a metal structure. If it is determined in step 15 that the detected waveform does not correspond to the standard waveform, in other words, a metal foreign object, a detection signal or an alarm signal is issued (step 16). If it is determined in step 15 that the detected waveform corresponds to the standard waveform, a normal signal is output (step 17).

  If the sensor 5 does not output a detection signal, an output signal indicating normality is output (step 11 → 17). It is preferable that the output signal indicating that the signal is normal is basically an output signal that does not output a signal or has a certain level. A series of determinations are performed in such a procedure. And after issuing an output signal, detection is performed from the above-mentioned step 10 (step 18).

[Others]
FIG. 12 illustrates a usage form of the metal foreign object detection device 1 of the present invention. The metal foreign object detection device 1 is arranged with the carry-in entrance sideways. This arrangement is suitable when the inspection object 2 flows horizontally. A marker device 28 is disposed on the discharge port side of the metal foreign object detection device 1. The marker device 28 marks the object 2 by ejecting ink or the like in accordance with the signal detected from the metal foreign object detection device 1 that detects the metal foreign object.

  The marker device 28 may be a device for marking with a laser. The control unit 26 is installed on the lower side of the frame 11. The vibration means 20 is installed below the inspection object 2. In this case, since the inspection object 2 tends to move downward due to gravity, the inspection object 2 is moved up and down by pushing it up with the vibration means 20. Thereby, the to-be-inspected object 2 and the sensor 5 perform relative motion.

  The vibration means 20 uses the rotating body 21 in the above-described example, but the following system can be used in addition. For example, the vibration means 20 uses an air flow type. Before the inspection object 2 enters the guide 4, the inspection object 2 is moved relative to the sensor 5 by blowing air to the inspection object 2 with air whose jet pressure is strong or weak. For example, the vibration means 20 can use a vertical vibration mechanism that vibrates up and down. The vertical vibration mechanism is composed of a bar or the like that is connected to a rotary motion mechanism such as a motor via a link mechanism, and moves up and down to vibrate the position of the inspection object 2.

  The vibration means 20 can utilize an air vibration cylinder. The air vibration cylinder is a transmission mechanical mechanism in which air is input and two mechanical valves provided in the tube are switched by the moving inertia force of the piston and vibrate. When one of the valves operates, the other reverses. It is. The air vibration cylinder further includes a quick exhaust valve for increasing the speed and lowering the hose temperature, a silencer and a silencer for reducing noise, a special structure that does not hit the stroke end, and an adjustment valve for adjusting the cycle.

  Further, the vibration means 20 can use a vibration mechanism that vibrates left and right or diagonally. This vibration mechanism is connected to a rotary motion mechanism such as a motor via a link mechanism, and is composed of a bar that vibrates by moving the position of the inspection object 2 left and right or diagonally. Furthermore, the vibration means 20 can use an electric vibration mechanism in which a magnet is disposed on one of the objects to be detected 2 and a coil that electrically generates an electrode is disposed on the other of the objects to be detected 2. In this electric excitation mechanism, an electrode is generated in the coil by connecting the coil to electricity, and when the magnet is attracted, the detected object 2 is attracted to the coil.

  When the electrode connected to the coil is reversed, the object to be detected 2 moves away from the coil because it repels the magnet. This is repeated to vibrate the object 2 to be detected. Further, the vibrating means 20 can use a magnetic material instead of a magnet. Specifically, a magnetic body is arranged instead of a magnet, and an electrode is formed by connecting a coil to electricity to attract the magnetic body. And if electricity is cut | disconnected, a magnetic body will leave | separate from a coil. This is repeated to vibrate the object 2 to be detected.

  Furthermore, the vibration means 20 can use two electromagnets arranged on both sides of the object 2 to be detected. In this case, by connecting or disconnecting electricity to the two electromagnets, the two electromagnets are attracted or separated from each other to vibrate the object 2 to be detected. Further, by switching the electric electrodes connected to the two electromagnets, the magnetic poles can be changed to both the electromagnets, and the two electromagnets can be attracted or separated from each other to vibrate the object 2 to be detected.

  In the example of FIG. 12, the metal foreign object detection device 1 of the present invention is horizontally arranged in accordance with the situation where the inspection object 2 is being conveyed horizontally. However, the metal foreign object detection device 1 of the present invention is inclined, in other words, a horizontal plane or a vertical plane in accordance with the situation in which the inspection object 2 is conveyed diagonally (so as to have a predetermined angle with a horizontal plane or a vertical plane). And having a predetermined angle.

  The present invention may be used in the field of manufacturing a product by filling a product in a continuous package such as a continuous packaging bag. In particular, the present invention is preferably used in the field of manufacturing pharmaceuticals, cosmetics, and foods by filling a product in a continuous packaging bag and detecting metal foreign matter therein.

DESCRIPTION OF SYMBOLS 1 ... Metal foreign material detection apparatus 2 ... Inspected object 3 ... Case 4 ... Guide 5 ... Sensor 6 ... Magnet booster 7 ... Signal processing part 8 ... Hollow part 20 ... Excitation means 21 ... Rotating body 23 ... Rotating shaft 24 ... Motor DESCRIPTION OF SYMBOLS 26 ... Control unit 27 ... Signal tower 28 ... Marker apparatus 30 ... Consecutive packaging process 31, 41 ... Accumulation 32 ... Hopper 33 ... Consecutive packaging apparatus 40 ... Inspection process 51 ... Oscillation circuit 52 ... Bridge circuit 53 ... Aluminum signal elimination circuit 54 ... Amplification / phase conversion circuit 55 ... Amplification / phase inversion circuit 56 ... Waveform processing unit 57 ... Digital computer processing unit 58 ... Signal output unit 101 ... Iron core 102 ... Coil 111 ... Memory 112 ... Central processing unit (CPU)
113 ... Input interface 114 ... Input device 115 ... Output interface 116 ... Display 118 ... External interface 119 ... External device

Claims (4)

A detection unit for detecting the presence or absence of a magnetic substance in an inspected object packed in a continuous package in which packaged packages are continuously connected, and a signal processing of a detection signal output from the detection unit Then, in the metal object detection device comprising a detection means comprising a signal processing unit for determining the presence or absence of the magnetic material and outputting an output signal indicating the result of the determination,
The detection unit is composed of a sensor coil having a configuration in which a conductive wire is wound around a core.
When the continuous package passes near the sensor coil, the metallic foreign object detection device has a vibration means for applying mechanical vibration to move the continuous package and the sensor coil relative to each other. . In the metal foreign object detection device according to claim 1,
When the continuous package and the sensor coil are moved relative to each other, the vibration means moves in a direction perpendicular to the direction in which the continuous package flows. In the metallic foreign matter detection device according to claim 1 or 2,
The vibration means comprises a driving means, a rotating body arranged in contact with the continuous package, and a rotating shaft for transmitting the rotational movement of the driving means to the rotating body,
The cross section of the rotating body in a plane perpendicular to the rotation axis of the rotating shaft has one shape selected from an elliptical shape, a polygonal shape, a groove cam, and a cylindrical cam. In the metallic foreign matter detection device according to claim 1 or 2,
The detection unit is composed of two sensor coils, a first sensor coil and a second sensor coil, and magnetizing means composed of an elongated first booster and a second booster,
The first sensor coil and the first booster are arranged in contact with one side surface of the first housing in parallel,
The second sensor coil and the second booster are arranged in contact with one side surface of the second housing in parallel,
The first casing and the second casing have a gap through which the continuous package passes, and are opposed to the side surface where the first sensor coil and the second sensor coil are in contact with each other. Parallel to each other, and the first sensor coil and the second sensor coil are arranged so that the first booster and the second booster are parallel,
Both sides of the first housing and the second housing are fixed by connecting plates,
The gap through which the continuous package passes is provided with a guide having a hole larger than the width of the continuous package in front.

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