JP4825954B2 - Seal defect inspection machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a seal defect inspection machine that inspects for seal defects such as pinholes in sealed packages that are formed of an insulating material such as resin and filled with a conductive fluid such as food, cosmetics, and medicine.
[0002]
[Prior art]
The conventional seal defect inspection machine for inspecting the sealing of the packaging container such as tofu sealing the packaging containers with lid defect, JP-B 62-70725 and JP-the art Tokuoyake Akira 63-101728 Patent Publication discloses known. In these methods, the brush-like first electrode to which a high voltage is applied is lightly applied to the inspection surface of the subject , that is, the upper surface of the lid that is hermetically sealed between the packaging container body and the sealed upper lid while the subject is being conveyed by the belt conveyor. while in contact, is a method for inspecting the presence or absence of seal failure by looking at the discharge phenomenon between the second electrode of the conductive plate in contact extends to the lower surface full width of the conveyor belt.
[0003]
In the method for applying a voltage to seal the lid on the surface entire in such a brush electrode, although insufficient sealing the lid surface is detectable, the adhesive portion of the flange and the upper lid at the top the entire circumference of the packaging container detection of seal failure is virtually impossible. This is because it is rare in practice that the size and shape of the container jar and the top lid are perfectly matched , and usually the size of the top lid is larger than the heel size.
[0004]
In addition, as a problem of quality inspection of cup-shaped packaging containers whose upper lid is sealed and sealed with the packaging container, when the contents are food, many are passed through a high-temperature boiling tank in the middle of the process as a sterilization process, and with cooling water as a post-treatment A cooling process is performed. And it is common that the seal | sticker part is inspected immediately after that.
[0005]
Products in cup-shaped packaging containers such as frozen desserts are generally mass-produced, and are sealed, pasteurized and cooled at a rate of several hundreds per minute, and then tested for defective seals. In the inspection of wet packaged packaging, there is still no seal failure inspection machine with sufficient performance, so it is the actual situation that visual inspection is performed by a large number of people, so it is inevitable that the cost will be high. It was.
[0006]
For this reason, due to the nature of the voltage application type seal defect inspection machine, it is necessary to remove the adhering water adhering to the packaging container with a water removal machine etc. as much as possible at the time of inspection, and to keep the moisture on the container surface as close to zero as possible. is there.
[0007]
However, since the general external dimensions of the lid as described above it is made larger than the outer dimensions of the container collar, and richness One and the residual water remaining in the seal portion be dewatered in the dewatering machine normal performance There were many cases, and it was found that even if this was wiped with human power using cloths, it still could not be removed. In such a case, in the conventional seal defect inspection apparatus , since the electrode does not properly contact the seal portion, an accurate seal defect inspection cannot be performed.
[0008]
[Problems to be solved by the invention]
Especially in the case of water removal incomplete subject, in the sealing failure inspection by the seal failure inspection apparatus of a general configuration described above, a proper detection of detecting the actual sealing failure, erroneous residual water seal portion detected hardly distinction between the, in the extreme case, it is also Ru Oh most number inspected is determined viewed as false faulty seal. There has been a strong demand for realizing a seal defect inspection machine that can always inspect a proper seal portion even if such residual water remains attached.
[0009]
The present invention, even when the cup packaging container sealed sealed with top cover has received the left seal failure inspection incomplete josui, to provide a seal defect inspection machine reliably voltage application scheme only the poor sealing Ru can distinguish treatment For the purpose .
[0010]
[Means for solving problems]
In order to achieve the above object, the present invention has a plurality of first electrodes divided and disposed along the outer periphery of a cylindrical container, and an outer periphery having a smaller diameter than the outer periphery of the upper cover, A second electrode that is in contact; a moving means that moves the first electrode between an “open” position spaced outward of the cylindrical container and a “closed” position that contacts the outer periphery of the cylindrical container; In addition, a seal failure detection circuit is provided that enables a high voltage to be applied between the first and second electrodes and detects a seal failure by the amount of flash current generated in a circuit connecting the electrodes.
For this reason, since the voltage application by the first electrode is directly applied to the seal portion, a seal failure can be accurately detected, and the second electrode is disposed clearly separated from the first electrode by a certain distance. Even if some residual water adheres to the seal part, there is no influence of false detection.
[0011]
Further, in order to facilitate the solution of the above problem, the first electrode is a metal fiber brush electrode that comes into contact with the lower surface of the bag provided at the upper edge of the cylindrical container at the time of inspection.
With such a configuration, it is possible to more reliably make contact between the entire bottom surface of the upper edge of the cylindrical container and the first electrode.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment of the present invention to explain with reference to FIGS. FIG. 1 is a side view of a first embodiment of the present invention, and FIG. 2 is a plan view . In these drawings, a state in which the subject 10 is seated and held while the subject supports 4 A and 4 B are in the “closed” state is illustrated. Here, the part to be examined of the subject (indicated by δ in FIG. 5) is in contact with the first electrodes 1A and 1B over the entire surface.
[0013]
Further, the two specimen abutments 4A and 4B are provided on the belt surface of the flat belt conveyor 30 by a suspension plate 26 having the same height as the subject 10 and the top plate 20 and the actuator 21. A pair of the actuators 21 are arranged close to each other in a direction perpendicular to the transport direction, and the actuator 21 opens and closes the split subject abutments 4A and 4B by a stroke that is more than the body diameter of the subject 10 without contacting the belt. (Arrowed arrow S).
[0014]
The piston rods 23 and 23B play a role of supporting the subject supports 4A and 4B in parallel and horizontal together with the rod guide 25 by the support rods 24A and 24B fixed to the suspension plate 26. The top plate 20, have been vertical actuator 22 is disposed at the center position of the object 10, which piston rod end of the plate-like second electrode 2 fixed to the elevation, the top of the object 10 after contact with the surface, and applying a voltage.
[0015]
The subject abutment 4A, 4B is vertically split at the center of the conveying direction, which is horizontally disposed as close as possible to the upper surface of the belt of the subject conveyor flat belt conveyor 30, and receives the subject 10 in the standby posture. seating as "open" in width, caught in such a proximity sensor of the subject 10 to approach riding a belt, closed two split subject abutment 4A, 4B at the timing of entry completion, narrowing embrace the subject 10 Let
Subsequently, the flat plate-like second electrode 2 that has been made to wait is brought into contact with the upper surface of the upper lid 6 of the subject 10 by the lowering of the vertical actuator 22 , so that either one of the electrodes 1, 2 is supplied through the arranged system power supply. Therefore, if there is a seal failure in the subject 10 , a flashing current is generated via the other electrodes 1 and 2 , the arranged detection control circuit functions, and the seal failure is caused by a large current value. A series of inspections such as detection determination and transmission of various outputs are completed.
At the same time as the examination is completed, the 20% of the subject abutments 4A and 4B holding the subject 10 are “open”, and the subject 10 is loaded on the belt conveyor 30 and discharged downstream.
[0016]
In this embodiment, since a mechanism in which the second electrode 2 described above to apply a contact voltage on the upper lid 6 of the specimen 10 by the lifting of the vertical actuator 22 disposed on the top plate, just the smooth application of the voltage Not only for the purpose of contact but also to slightly extend the lowering stroke of the vertical actuator under a certain control, pressurize the entire subject 10 including the portion to be inspected as a pressurized state with respect to the upper lid, and seal portion and housing It is configured to enable forced inspection that incorporates one step of strength confirmation and seal failure.
[0017]
The subject 10 is seated on the subject abutments 4A and 4B, and the flat plate-like second electrode 2 is lowered by the vertical actuator 22 to come into contact with the upper lid 6 of the subject 10 , and voltage is applied to the entire surface of the second electrode 2. To do.
[0018]
Next, the guide passage for correcting the flow orientation of the subject 10 disposed in close proximity to the upstream of the subject abutment 4A, 4B, always subject to subject 10 coming enters in at random posture abutment 4A, while correcting the posture of the "positive" that matches 4B seating orientation, a configuration obtained by adding a means to smoothly seat the subject 10 to the object abutment 4A, 4B.
[0019]
A second embodiment having such a configuration will be described with reference to FIG .
Seating state of the subject 10 is omitted, the belt on the surface of the flat belt conveyor 30, at approximately the same height as the subject 10 height as shown in FIG. 1, via the top plate 20 and the actuator 21 in hanging plate 26, two sets of the subject abutment 4A which is juxtaposed fixed shifted slightly in the conveying direction, 4B and 4A ', 4B' are shown, a pair of channel walls in each of the upstream side 3 3 As shown in the arrows F and F ′ for conveying rectification, by a separate rectifying means (not shown) that is disposed upstream of the flat belt conveyor and regulates the flow line of the subject 10 with respect to the guide path 31 that constitutes the path in FIG. The subject 10 in the case with the square lid that is transported to the position approaches the guide passage 31 in an at random posture like the posture case A and the posture case B.
[0020]
Regardless of the posture of the subject 10, first, one side of the square lids of the subject 10 impinges on the cylindrical turn edges 32, the subject 10 is assisted in the movement of conveyance of the conveyor belt as shown, It rotates while entering the rear parallel path, and approaches the subject abutments 4A and 4B in a positive attitude, that is, an attitude in which the advanced side is in an honest angle with the transport direction.
[0021]
Therefore, the proximity sensor 34 disposed near the front surfaces of the abutments 4A and 4B detects the approach of the subject 10 , and the subject abutments 4A ′ and 4B ′ flow from the “open” state to the flow of the subject 10 as illustrated. After that, the illustrated abutments 4A and 4B are “closed”, and the subject 10 is held in the subject abutments 4A and 4B shown in FIG .
[0022]
The operation of this embodiment and the inspection mechanism will be described with reference to the electric circuit diagram of FIG. The main inspection unit δ and the upper lid 6 on the surface of the object 10, as illustrated with the seating of the subject 10, the first electrode 1 and the second electrode 2, each of which applies a voltage in contact with these two electrodes 1 , 2 is connected to the power source 41 by the connection circuit 44, 45 and the detection control circuit 42 constitute a test circuit thereby.
[0023]
If there is such sealing failure pinhole main inspection unit δ and the upper lid 6, the discharge people flow is flow-from the first electrode 1 through the second electrode 2, the detection control circuit 42 exceeds the current prescribed value setting In this case, a seal failure is determined, and a detection signal or a removal signal to a defective product removal mechanism outside the system is transmitted.
[0024]
In the present embodiment, the specimen flowing on the upper surface of the transporter is held between the specimen abutments 4A and 4B for examination, and the first electrodes 1A and 1B mounted on the abutments 4A and 4B are used as the examination required parts. automatically contact the [delta], almost by applying a voltage in contact with the second electrode 2 at the same time the upper lid 6 top, inspection end at the same time abutment 4A, the subject 10 for opening 4B is discharged to the belt conveyor 30 The During this period of time can be processed in one seconds to a few minutes, can be per minute hundreds of processing in one line, it was Teki achieve the product 300 pieces / min or more of the processing in the inspection unit of the 4 groups.
[0025]
In actual施例of the present invention, specific embodiments of the actuator 21 is not shown, as a specific example of the drive medium of the actuator 21 is a hydraulic, using a hydraulic pressure control means (not shown) in the system In particular, it is assumed that the downward stroke of the vertical actuator 22 is slightly longer than the normal voltage application stroke. The control value shall be the adoption size of the subject 10, or depending on the intensity of the pressurized state, the stroke determined from the experimental results look like pattern of damage caused.
[0026]
【The invention's effect】
As described above, according to the present invention, even if a part of the sealing portion of a cup-shaped packaging container whose upper lid size is slightly larger than the ridge size of the container is wet with water , it is possible to reliably inspect the sealing failure, and this is automatically performed. It can also be made into a line .
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a plan view illustrating the flow of correcting the posture of a subject according to a second embodiment of the present invention.
FIG. 4 is an electric circuit diagram of an embodiment of the present invention.
FIG. 5 is an enlarged view of a portion to be inspected δ in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st electrode 2 2nd electrode 4 Subject abutment 5 鍔 6 Upper lid 7 Base 10 Subject 20 Top plate 21 Actuator 22 Vertical actuator 23 Piston rod 24 Support rod 25 Rod guide 26 Suspension plate 30 Flat belt conveyor 31 Guide passage 32 Turn edge 33 Passage wall 34 Proximity sensor

Claims (2)

A cup packaging container that is filled with conductive contents such as food and that has an upper end edge with a certain width of ridge and sealed the upper side of a bottomed cylindrical insulating resin material container with an insulating material thin plate top lid In a seal failure inspection machine that applies an AC or DC voltage between a pair of electrodes in contact and detects a seal failure by checking for the presence of a flashing current at the relevant location if there is a seal failure in the part requiring inspection . a plurality of first electrode along the outer periphery Ru is arranged to divide the tubular container, and a second electrode in contact with the upper cover top surface during inspection with a periphery of the smaller diameter than the outer periphery of said upper lid A moving means for moving the first electrode between an “open” position spaced outward of the cylindrical container and a “closed” position contacting the outer periphery of the cylindrical container; High voltage can be applied between the first and second electrodes contacting the lower surface of the Rutotomoni seal failure check machine and features that comprises a seal failure detection circuit for detecting a sealing failure due amount of flashover current generated in the circuit connected between the electrodes.   The seal defect inspection machine according to claim 1, wherein the first electrode is a brush electrode made of metal fiber that contacts a lower surface of a collar provided at an upper edge of the cylindrical container at the time of inspection.

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