JP3379822B2 - Metal detector and automatic packaging device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal detecting device for detecting a metal in an object to be detected, and an automatic packaging device having the metal detecting device for automatically packaging foods and the like.

[0002]

2. Description of the Related Art Foods, food preservatives, pharmaceuticals, desiccants, oxygen scavengers, seasonings, food additives, etc. are often transported or handled in a packaged state, and these are packaged or packed. The device packs a predetermined amount in a bag. There are two types of food preservatives, one containing iron-based oxygen scavengers and the other alcohol-based food preservatives that do not contain oxygen scavengers, both of which are packaged in air-permeable sachets for use.

Any of these types of food preservatives will be selected depending on the food used.

[0004]

By the way, when a food preservative of the type containing an iron-based oxygen scavenger is packaged by a filling and packaging device, each bag is filled with a certain amount of iron powder. It is necessary to check if it has been done. Further, in the case of packaging an alcohol-based food preservative with a filling and packaging device, even if a very small amount is present in the bag body that has been packaged in order to prevent the inclusion of metallic foreign matter in each bag. It is necessary to detect whether or not a metal is contained, and if there is a packaging bag containing metal, remove it.

Further, when the food preservative is packed by the filling and packaging device, one type of filling and packaging device can be used for both types of food preservatives containing iron-based oxygen scavengers and alcohol-based food preservatives. May be used selectively for filling and packaging.

[0006] An object of the present invention is to provide a metal detection device for detecting metal in a packaged object.

Another object of the present invention is a metal detection device capable of selectively detecting whether or not metal is mixed in a packaged object and whether or not the metal is contained in a predetermined amount. Is to provide.

Still another object of the present invention is to provide an automatic packaging device having a metal detection device for automatically packaging an object to be packaged such as food.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0010]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, the metal detecting device of the present invention detects whether or not a predetermined amount of metal is contained in the first receiving coil for detecting whether or not metal is contained in the object to be detected and the object to be detected. A second receiving coil for detecting whether or not is integrated, and an oscillating coil is provided in the second receiving coil via a space to be detected.
One output end of the first receiving coil or the second receiving coil is connected to the signal detecting unit via the switching means according to the type of the object to be detected. The first receiving coil is a balanced type receiving coil, the second receiving coil is an unbalanced type receiving coil, these receiving side coils are made of resin, and the oscillating coil is made of resin to form a detection space in the receiving side coil. It is attached integrally via.

Further, the automatic packaging apparatus of the present invention comprises a packaging means for filling a preservative, a seasoning, a food or a drug or the like to be packaged into a packaging bag, and the packaging means. Conveying means for conveying the packaging bag, an oscillation coil arranged to face the packaging bag, and a metal contained in the packaging bag arranged to face the oscillation coil via the packaging bag. And a receiving coil for detecting whether or not.

In addition to the wrapping means and the conveying means, the automatic wrapping apparatus of the present invention is arranged such that the oscillating coil arranged facing the wrapping bag body and the oscillating coil facing the oscillating coil via the wrapping bag body. And a receiving coil for detecting whether or not a predetermined amount of metal is contained in the packaging bag body. The packaging bag is made by folding the strip-shaped packaging material in two or
By sealing at a specified interval in the state of overlapping sheets,
A large number of bags are formed in a state of being connected to each other.

Further, in addition to the packaging means and the conveying means, the automatic packaging apparatus of the present invention is arranged such that the oscillation coil arranged to face the packaging bag body and the oscillation coil arranged to face the oscillation coil via the packaging bag body. And a first receiving coil for detecting whether or not metal is contained in the packaging bag, and an unbalanced type disposed adjacent to the first receiving coil and facing the oscillation coil The second which consists of a receiving coil and detects whether or not a predetermined amount of metal is contained in the packaging bag
And a receiving coil.

In the automatic packaging apparatus of the present invention, the first packaging bag body filled with the first packaging object which does not contain metal such as food is filled by the first packaging means. Common transport path for a first transport path for transporting the second packaging bag containing the second packaging bag and a second transport path for transporting the first packaging bag filled with the second packaging bag And a metal detection device provided in the portion of.

[0016]

In the metal detecting device of the present invention having the above structure,
By operating the switching means, it is possible to select whether or not a metal is mixed in the detected object and whether or not the detected object contains a predetermined amount of metal. It is possible to detect metal in an object.

Further, it is possible to automatically inspect whether or not metal is contained in the packaging bag filled with the object to be detected while the bag is being transported.

Then, it is possible to automatically inspect whether or not a predetermined amount of metal is contained in the bag body filled with the object to be detected while transporting the bag body.

Furthermore, while the packaged object is filled and conveyed in the packaging bag, whether or not the packaged object in the bag body contains metal and whether or not a predetermined amount of metal is contained. The heel can be inspected automatically.

When the first packaged object containing no metal and the second packaged object containing metal are packed in one packaging bag with a time lag, the first packaged object is filled. It is detected whether or not the bag body after being packed contains metal, and whether or not the bag body after being filled with the second object to be packed contains a predetermined amount of metal. Can be detected.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a perspective view showing the external appearance of the metal detection device of the present invention, FIG. 2 is a perspective view showing the internal structure of the detection unit shown in FIG. 1, and FIG. 3 is a control box shown in FIG. It is a circuit diagram which shows the control circuit in.

As shown in FIG. 1, this metal detection device has a detection section 10 and a control box 20.
As shown in FIG. 2, the detection unit 10 includes an oscillation coil 13 and a first coil.
It has a receiving coil 11 and a second receiving coil 12.

The oscillation coil 13 has, for example, 200K to
A high frequency current of about 300 KHZ is supplied, and a magnetic flux is formed by the high frequency current flowing through the oscillation coil 13. The first receiving coil 11 is arranged so as to face the oscillation coil 13 via the space 14 for the object to be detected. The first receiving coil 11 is a balanced type receiving coil, and is for detecting whether or not a metal is contained in the object to be detected. As shown in the drawing, the first receiving coil 11 has a structure similar to that in which two coils are differentially connected by extracting an output end from the middle of the coil to form a balanced receiving coil. It has high sensitivity. Further, the second receiving coil 12 is arranged adjacent to the first receiving coil 11, is composed of an unbalanced type receiving coil, and detects whether or not a predetermined amount of metal is contained in the object to be detected. The sensitivity is lower than that of the first receiving coil 11.

As shown in FIGS. 1 and 2, the detection section 10 includes a transmitting side section 10a in which an oscillating coil 13 is enclosed and a transmitting side section 10a.
Receiving side part 10b in which two receiving coils 11 and 12 are enclosed
And a base portion 10c that connects them via the space 14 for an object to be detected, and these transmitting side portion 10a and receiving side portion 1 are provided.
0b and the base portion 10c are integrally made of resin. That is, it is integrally formed by a resin mold. The bracket 10d attached to the base 10c enables the detector 10 to be mounted at a predetermined position.

By arranging the first and second receiving coils 11 and 12 so as to face the oscillating coil 13, the magnetic fluxes formed in the oscillating coil 13 cause the respective receiving coils 1 and 12 to move.
A voltage is generated in 1 and 12 by electromagnetic induction. When an object to be detected containing metal in the object space 14 is passed, the inductance in each of the receiving coils 11 and 12 changes, and the generated voltage changes.

In order to supply a high frequency current to the oscillation coil 13, a high frequency current generator, that is, an exciting oscillator 21 is provided in the control box 20 as shown in FIG. Further, in the control box 20, an amplifier 22 connected to the output end of the first receiving coil 11 is provided. The output end A of the first receiving coil 11 via the amplifier 22 and the second receiving coil 11 are provided. A change-over switch 23 connected to either one of the output terminals B of 12 is provided in the control box 20.

A rectifier 24 and an amplifier 25 are connected in series to the changeover switch 23, and the amplifier 25 has two
One detection relay 26, 26a is connected in parallel.
Therefore, the detection relays 26, 26 are detected by the voltage which becomes the direct current by the rectifier 24 and is amplified by the amplifier 25.
a is activated. One detection relay 26
Is activated when a voltage is applied, and the other detection relay 26a is activated when a voltage is not applied.

Transistors may be used in place of the detection relays 26 and 26a. In that case, the transistor provided in place of the detection relay 26 is
The output signal is output only when the voltage is output from the amplifier 25, and the transistor provided in place of the detection relay 26a outputs the output signal only when the predetermined voltage is output from the amplifier 25.

Two variable resistors 2 are connected in parallel to the amplifier 25.
7 and 28 are connected to each other, and by changing the partial pressure with respect to the amplifier 25 by the changeover switch 29 interlocking with the changeover switch 23, the respective receiving coils 11 and 12 are connected.
The sensitivity can be adjusted. The variable resistor 27 is operated by a sensitivity adjusting knob 27a provided on the front surface of the control box 20 shown in FIG. 1, and the variable resistor 28 is operated by a sensitivity adjusting knob 28a. Further, the two changeover switches 23 and 29 are adapted to be operated by the switch lever 23a.

Power is supplied from the power supply unit 30 to the exciting oscillator 21 and the like. The power supply unit 30 is turned on and off by a power switch 30a provided on the front surface of the control box 20. Made by.

By using such a metal detecting device, for example, a packaging bag body in which an alcohol type food preservative containing no oxygen absorber is packaged is used as an object to be detected. The switch lever 23a is switched to the A position in FIG. At the same time, the changeover switch 29 is also switched to the A position in synchronization with the switch lever 23a. In this state,
When the detected object is passed through the detected object space 14, if the detected object contains a metal, the mutual inductance generated in the first receiving coil 11 increases the electromotive force. When the detection relay 26 is activated by this electromotive force, it is determined that the object to be detected contains metal. In this way, when it is detected that the object to be detected contains a metal, the display unit 31 is turned on, and the operator is notified that the object to be detected contains the metal. Be informed. At the same time, the operator may be notified by a buzzer or the like.

When detecting how much metal is contained in the object to be detected, it is set by the variable resistor 27 according to the setting of the resistance value and the characteristics of the amplifiers 22 and 25.

On the other hand, in order to detect whether or not a predetermined amount of metal is contained in a food preservative of the type containing an iron-based oxygen scavenger, the changeover switch 23 is set to the B position in FIG. Switch. Changeover switch 2 in synchronization with this
9 is also switched to the B position, and when the object to be detected is passed through the object space 14 in this state, if the amount of metal contained in the object to be detected is below a predetermined amount, The electromotive force due to the mutual inductance generated in the second receiving coil 12 becomes low, and the detection relay 26a operates. From this, it was found that the detected object does not contain a predetermined amount of metal or more, that is, the content of the metal is less than or equal to the predetermined value, or that the content of the metal is greater than or equal to the predetermined value. It In such a case, the operator is notified by a buzzer or the like by the signal from the detection relay 26a as in the case described above. In this way, the changeover switch 23 determines which detection relay output signal is used as the detection signal.
It may be automatically selected in conjunction with.

FIG. 4 is a view showing a filling and packaging device, that is, a packaging machine, for automatically filling and packaging an object such as an oxygen absorber in a bag, and FIG. 5 is a packaging material in this filling and packaging device. It is a figure which shows the movement state of. The above-mentioned metal detection device is attached to this filling and packaging device, and it is detected whether or not metal is mixed in the contained object or whether or not a predetermined amount of metal is filled.

As shown in FIG. 4, the apparatus body 41 is loaded with a wrapping material 42 wound in a roll shape. The wrapping material 42 is a belt-shaped paper, aluminum foil or resin. It is formed of a film made of. The packaging material 42 is guided by a guide roller or the like for changing the posture, is fed out above the apparatus main body 41, and is folded into two by the film guide 44. In FIG. 4, reference numeral 42a indicates a spare packaging material, and if all the packaging material 42 has been dispensed, the packaging material is dispensed from the spare packaging material 42a.

A hopper 45 for accommodating an article to be packaged is provided above the apparatus main body 41, and a turntable 46 rotatably provided below the hopper 45 has a predetermined interval in the circumferential direction. A plurality of measuring cups 47 are provided for each. A plurality of filling nozzles 48 that rotate in synchronization with the measuring cup 47 are provided below the measuring cup 47, and the packaging material 42 is conveyed along the filling nozzles 48. A vertical seal bar 49 is provided on the rotating member 50 so as to be located between the two.

Therefore, the packaging material 42 after being folded in two is guided in an annular shape while the vertical seal bar 49 is being guided.
Thus, the packaging material 42 is adhered at a predetermined interval to form the bag body 51 having an open upper portion. In the bag body 51 whose upper part is opened, the object to be packaged is filled from the filling nozzle 48 while the bag body 51 is being conveyed, and after the filling is completed, as shown in FIG. The upper end of the bag body 51 is sealed by a sealing member (not shown). In this way, the sealed bags 51 are thermocompression-bonded by the die roll 52 shown in FIG. 4, and are separated into individual bags 51 from a state in which they are connected in a strip shape by a push-cut cutter (not shown). .

The apparatus main body 41 is provided with a carrying section 53, and the carrying section 53 is provided with a large number of chuck sections 54 for holding and carrying the separated bags 51, respectively. The part 54 is adapted to move in a circulating manner. Therefore, each bag 51 has a chuck 5
4 is conveyed to the left side in FIG. 4 in a state of being gripped, and is dropped on a guide plate (not shown) to be conveyed to the next step.

In the case shown in the drawing, a band-shaped packaging material is used and folded in two, and the two packaging materials are overlapped with each other while being conveyed at predetermined intervals. The vertical seal bar 49 is used to form a bag in a continuous state by sealing or adhering, and the cutter is used to separate the bags into individual bags, but a predetermined number of bags are connected. It may be handled by leaving it in the open state. In that case, the user will separate the continuous bags one by one,
Perforations may be formed in the seal portion, that is, the portion connecting the bags to each other so that they can be easily separated.

The apparatus main body 41 is provided with the detector 10 shown in FIGS. 1 to 3 for detecting the metal in the bag 51 which is gripped and conveyed by the chuck 54. In FIG. 4, reference numeral 55 indicates a display panel section.

If a food preservative of the type containing an iron-based oxygen scavenger is contained in the bags 51 shown in FIG. 5, whether or not each bag 51 contains a predetermined amount of metal. In order to detect that, the changeover switch 23 shown in FIG. 3 is set to the B position.

On the other hand, if an alcohol-based food preservative containing no iron powder is packed by the same filling and packaging apparatus, the changeover switch 23 is set to the A position so that the metal contained in the object to be stored is changed. It is detected whether or not they are mixed.

When it is detected that the bag body 51 does not contain a predetermined amount of metal, and when it is detected that the bag body 51 contains even a small amount of metal, the bag body 51 is filled with each metal. The operation of the packaging device is stopped and defective products are removed. In this case, the detected bag body may be marked with a marker so that the operator can easily visually check the bag body to be removed. Incidentally, as long as it is for detecting a metal, as shown in the above-mentioned examples, it is not limited to food preservatives. It may be. Further, in the case shown in FIGS. 4 and 5, one strip-shaped packaging material is folded in two, but two strip-shaped packaging materials may be stacked.

FIG. 6 is a schematic view showing the basic structure of an automatic packaging apparatus according to still another embodiment of the present invention, in which the first package 61a containing no metal such as food is packed in the first packaging bag. In the first packaging bag body 61, a first packaging device 63 to be filled in 61 and a second packaging bag body 62 in which a predetermined amount of metal such as a food preservative containing an iron-based oxygen scavenger is previously packaged. And a second packaging device 64 for filling.

The first packaging device 63 and the second packaging device 64 are connected by the first transport path 65, and the first packaging device 6
The first packaging bag body 61 filled with the first article to be packaged 61a by 3 is conveyed to the second packaging device 64. A part of the second transport path 66 for transporting the first packaging bag body 61 after the second packaging bag body 62 is filled by the second packaging device 64 to the next step is partly the first transport path 65. The same or nearly the same as a part of the same, that is, the common conveyance path 6
It is part 7.

Therefore, after the first packaging bag 61 is filled with the first object to be packaged 61a such as food, the second packaging bag 62 in which the preservative for storing the food is packaged When the packaging bag 61 is filled, the common conveyance path 67
By arranging the detection unit 10 shown in FIGS. 1 to 3 in the portion, it is possible to detect whether or not the first packaging bag body 61 filled with the first object to be packaged 61 contains metal. You can Further, it is possible to detect whether or not a predetermined amount of metal is contained in the food preservative containing the iron-based oxygen scavenger, that is, the second packaging bag body 62 filled in the first encapsulated object 61a. it can. Note that, in FIG. 6, the common conveyance path 67 of the first conveyance path 65 and the second conveyance path 66 is a detection unit 1 for convenience of drawing.
Although it is shown as being shifted in the width direction of the space 14 for an object to be detected at 0, it is preferable that the space 14 is aligned in the width direction and vertically shifted.

The detection mode of the detection unit 10 is set by switching the changeover switch 23 to determine which detection is to be performed. In such an automatic packaging device, when the second packaging bag body 62 is filled into the first packaging bag body 61 after packaging a predetermined number of the first packaging bag bodies 61, the detection unit 10 may be set to any detection mode. It has the advantage that it can be used. In the second packaging device 64, the second packaging object 62 is automatically filled with the band-shaped packaging material 42 as shown in FIG. It may be filled in the body 61.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, in the illustrated case, an unbalanced type receiving coil is used as the second receiving coil 12, but a balanced type receiving coil may be used similarly to the first receiving coil 11. In that case, the variable resistor 2
By selecting the characteristics 7 and 28, the respective coils 11 and 12 are set to the predetermined sensitivity required for detection.

[0050]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

(1). According to the present invention, it is possible to automatically detect whether or not a metal is contained in the object to be detected.

(2) It is also possible to automatically detect whether or not a predetermined amount of metal is contained in the object to be detected.

(3). Whether the object to be detected containing metal contains a predetermined amount of metal and whether the object to be detected containing no metal contains metal. The heel
Can be selectively detected according to the type of detected object,
Multiple kinds of metal detection can be performed by one metal detection device.

(4). Whether or not metal is contained in the bag body while packaging the object to be packaged in the bag body by the filling and packaging device,
Alternatively, it is possible to automatically detect whether or not a predetermined amount of metal is contained in the bag body.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outer appearance of a metal detection device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an internal structure of a detection unit shown in FIG.

3 is a circuit diagram showing a control circuit in the control box shown in FIG.

FIG. 4 is a front view showing an automatic packaging device provided with a metal detection device.

5 is a schematic perspective view showing a moving state of a packaging material in the automatic packaging device shown in FIG.

FIG. 6 is a schematic view showing the basic structure of another embodiment of the automatic packaging device of the present invention.

[Explanation of symbols]

10 Detector 10a Calling side 10b receiving side 10c base 11 First receiver coil 12 Second receiving coil 13 Oscillation coil 14 Space for detected objects 20 control box 21 Excitation oscillator 22 amplifier 23 Changeover switch 24 Rectifier 25 amps 26,26a Detection relay 27,28 Variable resistor 27a, 28a Sensitivity adjustment knob 29 Changeover switch 30 power supply unit 41 Device body 42 Packaging material 44 Film guide 45 hopper 53 Transport section 61 First packaging bag 61a First object to be packaged 62 Second packaging bag 63 First Packing Device (First Packing Means) 64 Second packaging device (second packaging means) 65 First transport path 66 Second transport path 67 Common transport path

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-262089 (JP, A) JP-A-60-78373 (JP, A) Practical application Sho-62-105107 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G01V 3/10 B65B 57/10 G01N 27/72

Claims (5)

(57) [Claims] 1. An oscillating coil, a first receiving coil which is arranged to face the oscillating coil through a space for an object to be detected and which detects whether or not a metal is contained in the object to be detected, and the first receiving coil. A second receiving coil which is arranged so as to face the oscillation coil through a space for the object to be detected and detects whether or not a predetermined amount of metal is contained in the object to be detected; A metal detecting device comprising: a switching unit that switches one output end of the second receiving coil to connect the signal detecting unit. 2. The receiving coil, wherein the first receiving coil is a balanced receiving coil, the second receiving coil is an unbalanced receiving coil, and the first receiving coil and the second receiving coil are enclosed. 2. The metal detection device according to claim 1, wherein the housing portion and the oscillation coil housing portion in which the oscillation coil is sealed are integrally mounted with a resin through the space for the object to be detected. 3. A packaging means for filling an article to be packaged such as a food preservative, a seasoning, a food or a drug into a packaging bag body, and a delivery for delivering the packaging bag body filled with the article to be packaged by the packaging means. Means, an oscillation coil arranged to face the packaging bag, and a balanced receiver coil arranged to face the oscillation coil via the packaging bag, and a metal is contained in the packaging bag. And a first receiving coil for detecting whether or not there is an unbalanced type receiving coil disposed adjacent to the first receiving coil and facing the oscillation coil. A second receiving coil for detecting whether or not it is included .
Automatic packaging apparatus that. 4. A wrapping material in the form of a strip is folded in two, or two wrapping materials are stacked and sealed at a predetermined interval to form a large number of wrapping bags connected to each other. The automatic packaging device according to claim 3 . 5. A first packaging means for filling a first packaging object such as food containing no metal in a first packaging bag body, and a second packaging bag body having a food preservative containing a predetermined amount of metal. The first
A second wrapping means for filling the inside of the wrapping bag body, and a first wrapping means for carrying the first wrapping bag body filled with the first object to be packed by the first wrapping means to the second wrapping means via a common carrying path. A transport path, a second transport path for transporting the first packaging bag filled with the second packaging bag through the common transport path, and a common transport path facing the first packaging bag. In the first object to be packed, which is filled with the first packing means, and includes an oscillating coil arranged in parallel with the oscillating coil and a balanced type receiving coil arranged to face the oscillating coil through the first wrapping bag. A first receiving coil for detecting whether or not metal is included,
A second packaging bag body, which is composed of an unbalanced type receiving coil disposed adjacent to the first reception coil and facing the oscillation coil, contains a predetermined amount of metal in the first packaging bag body. And a second receiving coil for detecting whether or not the automatic packaging device is present.