JP2020148685A - Double detection device of container and method thereof - Google Patents

Abstract

To provide a double cap detection device of a container capable of detecting double stacking of a cap sealing an upper surface opening of the container during conveyance.SOLUTION: A double cap detection device 10 of a container comprises: a magnetic field generation unit 20 that has a first coil 24 that generates a magnetic field whose radiation direction intersects a cap surface of a container 1 that seals an upper surface opening with a cap, and a second coil 26 that faces the first coil 24 and is arranged so as to sandwich the container 1 therebetween to receive the magnetic field, and that can arrange transport means of the container 1 between the first and second coils 24, 26; and a detection unit 40 that is electrically connected to the magnetic field generation unit 20, and detects double stacking of the cap based on the difference in a transmission amount of the magnetic field of the first and second coils 24 and 26 with respect to the cap.SELECTED DRAWING: Figure 1

Description

The present invention is an apparatus and a method for detecting a double cap (also referred to as two caps) of a container after filling a container with a lactic acid bacteria beverage or the like on a food production line and sealing the upper surface opening with a non-ferrous metal cap. Regarding.

In the production line of a container for filling a lactic acid bacteria beverage or the like, there is a step of filling the container with the lactic acid bacteria beverage or the like and then sealing it with a non-ferrous metal cap such as aluminum.
In this sealing step, first, an aluminum cap in which a heat-meltable adhesive is previously applied to the adhesive surface with the container is put on the upper surface opening of the container. Then, while applying a high-frequency magnetic field from above by the metal tubular body, the container is pressed upward by the pressing means from below. At this time, an eddy current is generated in the aluminum cap by an electromagnetic induction action, and the temperature of the aluminum cap is raised by the heat generation action of the eddy current and the natural resistance of the aluminum cap to melt and seal the adhesive. On the transport line, a configuration is adopted in which a plurality of combinations of a metal tubular body and pressing means are provided so that a plurality of containers can be sealed.

In the process of covering the upper surface opening of the container with the aluminum cap, usually, when the aluminum cap is applied to the upper surface opening one by one, in rare cases, the aluminum cap punched out in the punching process of the aluminum cap in the previous stage is caught in the bracket. It did not fall and could completely overlap the next cap and cover the top opening of the container.
If the container covered with such a double-layered cap is sealed in the subsequent sealing process and the airtightness of the seal is ensured like a normal product, the thickness per cap is several tens of μm. Therefore, it was extremely difficult to visually distinguish the container from the container sealed with one aluminum cap.

Here, the applicant has introduced a device capable of detecting a defect of the cap seal by eliminating the human involvement by the seal checker of the cap in the product container as in Patent Document 1. However, this device presses and deforms the side surface of the container to detect the presence or absence of airtightness of the seal and the state of sealing. For this reason, even if the double-layered container of the cap is pressed, if the airtightness of the seal is ensured, it is judged as a good product, and the double-layered cap cannot be detected and may be mixed into the product as it is. was there.
Further, conventionally, there is a device for detecting double insertion of a printed wiring board (Patent Document 2). This detection device detects a state in which the magnetic flux density due to the eddy current generated in the detected metal increases in proportion to the increase in the thickness of the metal portion when the printed wiring boards are overlapped. However, this device detects the amplitude of the magnetic flux density, and cannot be detected even if it is applied as it is to the double cap of a container with a cap of several tens of μm.

Japanese Unexamined Patent Publication No. 2001-242035 Jikkenhei 5-14810

In view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is to provide a container double cap detection device and a method thereof for detecting double-layered caps that seal the upper surface opening of the container during transportation. It is in.

In the present invention, as a first means for solving the above problems, a first coil that generates a magnetic field in which the radiation direction intersects the cap surface of the container that seals the upper surface opening with a cap, and the first coil. A magnetic field generating unit that is opposed to each other and has a second coil that receives the magnetic field by arranging the container so as to sandwich the container, and can arrange the transport means of the container between the first and second coils. ,
It is characterized by including a detection unit that is electrically connected to the magnetic field generating unit and detects the double stacking of the caps from the difference in the amount of transmission of the magnetic field of the first and second coils with respect to the cap. It is an object of the present invention to provide a double cap detection device for a container.
According to the first means, it is possible to efficiently detect the double stacking of caps of a container whose upper surface opening is sealed with a cap.

The present invention provides, as a second means for solving the above-mentioned problems, a double cap detection device for a container, characterized in that the oscillation frequency of the first coil is 15 kHz to 30 kHz in the first means. To do.
According to the second means, the eddy current can be generated for the second cap, and the magnetic field can be easily generated from the eddy current, so that the double cap can be easily detected.

In the present invention, as a third means for solving the above problems, a first coil that generates a magnetic field whose radial direction intersects the cap surface of a container that seals the upper surface opening with a cap, and the first coil. By a magnetic field generating unit which has a second coil which is arranged so as to face each other and sandwiches the container between them and receives the magnetic field, and a transport means of the container can be arranged between the first and second coils. The process of generating a magnetic field on the cap surface of the container during transportation,
A step of detecting double-layering of the cap from the difference in the amount of transmission of the magnetic field of the first and second coils with respect to the cap, and
It is an object of the present invention to provide a method for detecting a double cap of a container, which comprises the above.
According to the third means, it is possible to efficiently detect the double stacking of caps of a container whose upper surface opening is sealed with a cap.

According to the present invention, it is possible to efficiently detect the double stacking of caps of a container whose upper surface opening is sealed with a cap.

It is a block diagram of the structure of the double cap detection device of the container of this invention. It is explanatory drawing of the magnetic field generation part. It is explanatory drawing of the magnetic field of the 1st and 2nd coils. It is explanatory drawing of the phase detector. It is explanatory drawing of the good product detection by a phase detector. It is explanatory drawing of the defective product detection by a phase detector. It is a process flow diagram of the double cap detection method of a container.

An embodiment of the double cap detection device for a container of the present invention and the method thereof will be described in detail below with reference to the accompanying drawings.
In the present embodiment, the double cap includes two or more non-ferrous metal caps such as aluminum, copper, brass, and austenitic stainless steel that cover the upper opening of a container filled with beverages such as lactic acid bacteria beverages and various foods. ) The top opening of the container is sealed in the overlapping state. The general thickness of such an aluminum cap is 6 to 50 μm per sheet.

FIG. 1 is a schematic configuration diagram of a double cap detection device for a container of the present invention, (1) is a plan view, (2) is a front view, and (3) is a side view. 2A and 2B are explanatory views of a magnetic field generating portion, FIG. 2A is a plan view of the first coil, FIG. 22 is a side view of the first and second coils, and FIG. 23 is a plan view of the second coil. FIG. 3 is an explanatory diagram of the magnetic fields of the first and second coils. FIG. 4 is an explanatory diagram of the phase detector. FIG. 5 is an explanatory diagram of non-defective product detection by the phase detector. FIG. 6 is an explanatory diagram of defective product (double cap) detection by the phase detector. FIG. 7 is a processing flow chart of the double cap detection method for the container.
[Double cap detection device for container 10]
The double cap detection device 10 for a container of the present invention has a pedestal 14 arranged below a conveyor (also referred to as a conveyor) 12 of a food production line, and a casing 16 arranged on the pedestal 14. A magnetic field generating unit 20 that generates a magnetic field and a detecting unit 40 that detects the double cap of the container 1 are arranged therein, and an alarm unit 50 that notifies that the double cap is detected is arranged in the gantry 14. ..
The casing 16 is provided with a through hole 17 through which the feed side conveyor (conveyor for transporting the container) 12a of the transport conveyor 12 penetrates on the side surface, and the lower end thereof is arranged above the return side conveyor 12b.

[Magnetic field generator 20]
The magnetic field generating unit 20 has a configuration in which the casing 16 is provided with the first coil 24 and the second coil 26 (see FIG. 2).
The first coil 24 and the second coil 26 are attached above and below the through hole 17 of the casing 16 and are arranged so that their main surfaces face the cap surface of the container transported by the conveyor 12. In the present embodiment, the first coil 24 is arranged above the feeding side conveyor 12a (above the through hole), and the second coil 26 is arranged below the feeding side conveyor 12a (below the through hole).
The first coil 24 is a coil that generates (oscillates) a high-frequency magnetic field (hereinafter, also simply referred to as a magnetic field) whose radiation direction intersects the cap surface of the container 1. The first coil 24 is formed in a rectangular shape so as to straddle the conveyor 12 in the through hole 17. The size (area) of the main surface of the first coil 24 is set to at least the area (1 times) of the aluminum cap. If it is smaller than this, the eddy current is not efficiently generated and the magnetic field cannot be detected.

Here, a general metal detector utilizes a high frequency magnetic field when detecting a non-ferrous metal such as an aluminum cap. This is because a larger amount of eddy current (large eddy current loss) is generated on the surface of the aluminum cap to increase the disturbance of the magnetic field. The detection sensitivity is improved by the disturbance of this large magnetic field.
However, when a large amount of eddy current is generated, the magnetic field transmitted through the aluminum cap decreases, and a general metal detector cannot detect the double cap.
In order to detect the double cap of the container, it is necessary for a certain amount of magnetic field to pass through the first cap. That is, the double cap can be detected by the difference in the amount of magnetic field transmission between the non-defective product and the double cap. Therefore, in the first coil 24 of the present embodiment, the oscillation frequency is set low so that the magnetic field is transmitted to generate an eddy current for the second cap, and the magnetic field is easily generated. Therefore, the oscillation frequency of the first coil 24 of the present embodiment is set to 15 kHz to 30 kHz.
The second coil 26 is a coil that receives the magnetic field generated from the first coil 24. The second coil 26 is composed of an A coil and a B coil, and is formed in the same rectangular shape as the first coil 24 as a whole.
The length between the first and second coils 24 and 26 is set to be at least longer than the height of the container 1.

In addition to the arrangement shown in FIG. 2, the first and second coils are arranged such that the first coil 24 is located below the feeding side conveyor 12a (below the through hole) and above the feeding side conveyor 12a (above the through hole). The configuration may be such that the second coil 26 is arranged upside down.
Due to the configuration of the first and second coils 24 and 26, when a high frequency magnetic field is generated from the first coil 24, in the case of a double cap, a first eddy current is generated in the first cap (see FIG. 3). .. Then, a first magnetic field is generated from the first eddy current. A second eddy current is also generated in the second cap. Then, a second magnetic field is generated from the second eddy current. The second coil 26 receives the magnetic fields generated from the first coil 24, the first cap, and the second cap. In particular, the first magnetic field of the first sheet is attenuated when passing through the second cap, and is strongly affected by the second magnetic field of the second cap. In addition, the magnetic field (magnetic field generated from the first coil and the first cap) of a good product (one cap) is also measured in advance as a reference value.

[Detection unit 40]
The detection unit 40 is provided with a phase detector that is electrically connected to the magnetic field generation unit 20 and the alarm unit 50 described later, and detects the double cap based on the measured value of the magnetic field by the magnetic field generation unit 20. The phase detector works as follows.
In the initial state of the magnetic field generating unit 20 (a state in which nothing has passed), when the high frequency magnetic field lines generated from the first coil 24 are received by the second coil 26, the A coil and the B coil of the second coil 26 receive the high frequency magnetic field lines. Is adjusted so that the same amount of magnetic field lines pass through (see FIG. 4 (1)). At this time, the waveform of the received current is canceled by the difference calculation of the A coil and the B coil by the phase detector (see FIG. 4 (2)).
When a non-defective product (one aluminum cap) passes through the magnetic field generating unit 20, when a container enters the A coil (upstream side) (see FIG. 5 (1)), the magnetic flux passing through the A coil is attenuated and a current is generated. Decrease. Next, when the container enters the B coil, the magnetic flux passing through the B coil is attenuated and the current decreases. At this time, the eddy current flowing through the aluminum cap of the container becomes maximum when the magnetic flux change is maximum, so that the received current of the second coil 26 advances by 90 degrees. Since the change in electromotive force due to the change in magnetic flux due to this eddy current advances by 90 degrees, it advances by 180 degrees in total (see FIG. 5 (2)). The average value of the X-axis phase detection (waveform cutout of 0 to 180 degrees) of the A coil and the B coil is −V for the A coil and + V for the B coil (see FIG. 5 (3)). Next, the average value of the Y-axis phase detection (waveform cutout of 90 degrees to 270 degrees) of the A coil and the B coil is 0 for both the A and B coils (see FIG. 5 (4)). The state phase of the average value of the X-axis phase detection is plotted on the X-axis, and the state phase of the average value of the Y-axis phase detection is plotted on the Y-axis (see FIG. 5 (5)). As a result, when focusing on the Y-axis component, the detection signal becomes 0.

When a defective product (two aluminum caps are stacked) passes through the magnetic field generating unit 20, when the container enters the A coil (upstream side) (see FIG. 6 (1)), magnetic flux is generated by the first aluminum cap. It attenuates and at the same time advances the phase by 90 degrees. The magnetic flux reaching the second aluminum cap is the remnant of the magnetic flux attenuated by the first piece, and the phase advances by 90 degrees here as well. The change in magnetic flux reaching the second coil 26 is a composite vector of the component rotated by the first coil and the component rotated by the second coil due to the magnetic flux attenuated by the first coil. Therefore, when two aluminum caps are stacked. The signal change of is a component having a phase difference between 90 degrees and 180 degrees (see FIG. 6 (2)). The average value of the X-axis phase detection (waveform cutout of 0 to 180 degrees) of the A coil and the B coil is −A for the A coil and + A for the B coil (see FIG. 6 (3)). Next, the average value of the Y-axis phase detection (waveform cutout of 90 degrees to 270 degrees) of the A coil and the B coil is + B for the A coil and −B for the B coil (see FIG. 6 (4)). The state phase of the average value of the X-axis phase detection is plotted on the X-axis, and the state phase of the average value of the Y-axis phase detection is plotted on the Y-axis (see FIG. 6 (5)). As a result, focusing on the Y-axis component, the detection signal is ± B.

The detection unit 40 uses a non-defective product (one cap) of the container 1 measured in advance as a reference value. A container 1 having no difference from this reference value is judged to be a good product. On the other hand, the measured value of the double cap is a value strongly influenced by the second magnetic field of the second cap, and is different from the reference value due to a difference. In this case, it is judged as a double cap. In the examples of FIGS. 5 and 6, the detection signal of the non-defective product is 0, and the detection signal of the defective product has a difference of ± B, so that the two aluminum caps can be detected.
[Alarm unit 50]
The alarm unit 50 is electrically connected to the detection unit 40, receives a detection signal of the double cap, and issues an alarm.

[Double cap detection method for containers]
The double cap detection method for the container of the present invention based on the above configuration will be described below.
Step 1: A magnetic field is generated from the first coil 24 of the magnetic field generating unit 20 of the double cap detection device 10 of the container attached to the conveyor 12 on the production line.
Step 2: The container 1 is conveyed by the transfer conveyor 12 and passed through the through hole 17 of the casing 16.
Step 3: Detect the double cap of the container 1 supplied between the first and second coils 24 and 26 of the magnetic field generating unit 20 (presence or absence of the double cap). A good product (one cap) of the container 1 is measured in advance, and this value is used as a reference value. A container that does not differ from this standard value is judged to be a good product. On the other hand, the measured value of the double cap is a value strongly influenced by the second magnetic field of the second cap, and is different from the reference value due to a difference. In this case, it is judged as a double cap.
Step 4: When the double cap of the container 1 is detected (yes), the alarm unit 50 generates an alarm.
Step 5: In step 4, the presence or absence of the container 1 to be continuously inspected without the double cap is confirmed. The confirmation is performed using various sensors (not shown) or the like. As a result, if there is a container 1, the transition to step 2 is repeated. On the other hand, if there is no container 1, the process ends.
According to the present invention as described above, it is possible to efficiently detect the double stacking of caps of a container whose upper surface opening is sealed with a cap.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.

The double cap detection device for a container of the present invention has industrial applicability, especially in the field of manufacturing a container filled with beverage foods, chemicals, etc. and whose top opening is sealed with a cap.

1 Container 10 Container double cap detection device 12 Conveyor conveyor 14 Stand 16 Casing 17 Through hole 20 Magnetic field generator 24 1st coil 26 2nd coil 40 Detection unit 50 Alarm unit

Claims (3)

The magnetic field is arranged so as to face the first coil and to sandwich the container between the first coil that generates a magnetic field that intersects the cap surface of the container that seals the upper surface opening with a cap. A magnetic field generating unit having a second coil for receiving the container and capable of arranging a transport means for the container between the first and second coils.
It is characterized by including a detection unit that is electrically connected to the magnetic field generating unit and detects the double stacking of the caps from the difference in the amount of transmission of the magnetic field of the first and second coils with respect to the cap. Double cap detection device for the container. The container double cap detection device according to claim 1.
A container double cap detection device characterized in that the oscillation frequency of the first coil is 15 kHz to 30 kHz. The magnetic field is arranged so as to face the first coil and to sandwich the container between the first coil that generates a magnetic field whose radiation direction intersects the cap surface of the container that seals the upper surface opening with a cap. A step of generating a magnetic field on the cap surface of the container being transported by a magnetic field generating portion capable of arranging a transporting means of the container between the first and second coils having a second coil for receiving the above.
A step of detecting double-layering of the cap from the difference in the amount of transmission of the magnetic field of the first and second coils with respect to the cap, and
A method for detecting a double cap of a container, which comprises having.

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