JP3775565B2 - Pinhole inspection machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pinhole inspection apparatus that inspects for sealing defects such as pinholes in various forms of sealed packaging containers that are formed of an insulating material such as a resin and are filled with food, cosmetics, drugs, and the like.
[0002]
[Prior art]
A conventional pinhole inspection apparatus is configured by arranging a belt conveyor of a specimen conveying means as in the patent (Japanese Patent Publication No. Sho 62-70725) or the actual model (Examined No. 9-10008) or a pair of front and rear in series and horizontally. In many cases, a test is performed by applying a voltage to the seal portion of the subject being transported.
[0003]
In these methods, in the case where a large amount of air is contained in the subject, when the voltage is applied, depending on the thickness of the air layer interposed above the surface, the pinhole portion There was a problem that the flashing phenomenon was hindered and sufficient performance could not be obtained.
[0004]
If the container contains air or is consciously filled with a specific gas, such as a resin cup encased in bean beans with a top lid sealed or a cylindrical container with an upper seal such as a top lid filled with similar fluid products, these gases Because of this insulation resistance, there is a problem that it is extremely difficult to inspect a seal failure by a voltage application method, and there has been a strong demand for improvement.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a tilting means for tilting a packaged specimen transported by a transporting means such as an endless flat belt conveyor so that a sealing surface forms a predetermined angle with respect to a horizontal plane. Is a pair of endless belt conveyors having a substantially cylindrical peripheral surface of a packaged object sandwiched from both sides and facing each other in parallel, and having parallel opposed surfaces that move around in the transport direction at different speeds. The specimen is configured so as to be driven and rotated around the central axis when nipped and conveyed between the pair of parallel opposing surfaces .
[0006]
【Example】
A reference example as a premise of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory diagram showing the principle of the present invention and the relationship with the control circuit. FIG. 2 shows that when the subject 40 is inclined by an angle α as shown in FIG. 1, the contained air a is unevenly distributed on the left side of the figure due to buoyancy, and the right side is shown with W ′ on the right side. It is a top view which shows that the liquid-contact part with the width | variety of (delta) determined from quantity exists.
[0007]
FIG. 3 shows that the positive electrode 1 that applies a voltage while inclining by a certain angle α and the subject 40 advances in the upward direction in the P direction and is lightly in contact with the entire surface of the seal portion 41 and the outer periphery of the body of the subject 40 are inspected It is explanatory drawing which showed the guide friction board 3 which served as the negative electrode which is always in sliding contact, the floating rope belt pulleys 5 and 6 for rotation, and the endless rope belt 4 system-extended to this.
[0008]
FIG. 4 is a plan view of FIG. 3, in which voltage is applied by endless rope belts 4 and 4 ′ that are stretched on idle rope belt pulleys 5 and 6 that are slightly pressed against the inner side of the conveyor belt 10 by a coil spring 21. As the subject 40 is lightly pressed against the guide friction plate 3 that also functions as the negative electrode at the time and advances in the direction of the arrow P of the conveyor belt 10, the subject 40 shows a state of rotating as shown by the arrow T. ing.
[0009]
Next, the actual施例of the present invention will be described with reference to FIGS. FIG. 6 is a plan view of this embodiment, and FIG. 7 is a side view of the subject 40 placed between the pre-loading conveyor 50 and the post-discharge conveyor 60 after the pin pole inspection. Both sides of the sliding plate 12 are at a distance S that also serves as a negative electrode for rotational conveyance and is sandwiched lightly between the sliding plate-like inspection passage 12 fixed at a fixed inclination angle α and the subject 40 sliding on this upper surface. The endless rope belts 4, 4 'and 14, 14' are respectively stretched on a pair of electric rope belt pulleys 7, 17 and idle rope belt pulleys 6, 16 arranged in parallel to each other.
[0010]
The rotational speeds of the electric belt rope pulleys 7 and 17 are differentiated, and the endless rope belt speed is configured to give a sufficient speed difference of V> v as shown by the arrow lengths V and v.
Here, the dimension L is the same as or slightly longer than the circumferential length of the subject 40, and is configured such that when the subject is rotated by the speed difference of the rope, it is completely rotated in the direction of the arrow T. Yes.
[0011]
Furthermore, another reference example of the present invention will be described with reference to FIGS. FIG. 8 is a plan view of this reference example. As shown in the side view of FIG. 9, the upper surface of the belt 10 is inclined by a certain angle β in the direction perpendicular to the transport direction, and therefore the subject 40 is also at an angle β. The liquid surface Wa of the slanting fluid content has a form similar to that shown in FIG. 3 and FIG. 4, it can be seen that the flat belt 10 is substantially the same as the flat belt 10 except that it is horizontal and is inclined by an angle β in a cross section perpendicular to the conveying direction. It can be understood that this is exactly the same as the reference example shown in FIG.
[0012]
FIG. 5 is an explanatory diagram that also serves as the floating rope belt pulleys 5 and 6 in FIGS. 3 and 4 and the electric rope belt pulleys 7 and 17 in FIGS. 6 and 7. The electric motors 8 and 18 are shown by chain lines for convenience. . The rope belt pulleys 5, 6, 7, 16, and 17 are rotatably supported by bearings 22 that are slidably engaged with the guide grooves 24 of the bearing base 25, and each rope belt is supported by a coil spring 21 and a screw rod 23. When the pulley is in operation, it functions as if it is lightly pressed in the Y direction shown in the figure. Reference numeral 26 denotes a support bracket for the electric motors 8 and 18.
[0013]
Next, the utility of the first reference example will be described by the mechanism and operation of the present invention. The cylindrical specimen 40 loaded and transported on the conveyor belt 10 in FIG. 4 is pressed lightly against the conveyor by the coil spring 21 arranged in parallel at a distance S while facing the guide friction plate 3 also serving as the negative electrode. When it comes to the pulley 6 on the entrance side of the loosely configured rope belt pulley, the object 40 is sandwiched between the oblique opening of the guide friction plate entrance 3 'and the pulley 6, and the object 40 is placed on the conveyor belt 10 as shown in the figure. It advances while rotating in the direction of arrow T by friction with the guide friction plate due to the conveying force in the direction and the pressing force of the endless rope belt 4, and passes through the inspection machine after completion of the inspection.
[0014]
As a result, the positive electrode 1 waiting as shown in FIG. 3 applies a voltage to the upper lid seal portion 41 of the subject. Here, the entire transport system is inclined by the angle α. When W ′ shown in the drawing is relatively rotated, it rotates once, and a complete voltage application inspection is performed only on the liquid contact portion of the seal portion.
[0015]
Therefore, if there is a pinhole or a seal failure in the inspection part, a flashing current will be generated at the defective part between the negative and positive electrodes (1, 2) due to the applied voltage. Compared with the set reference value, and at the time of confirmation, a defect warning signal, an exclusion signal in a subsequent process, etc. are transmitted.
[0016]
In the following, the operation of the embodiment of the present invention. The subject 40 conveyed from the belt conveyor 50 for loading upstream of the inspection machine is an pulley on the entrance side of the electric rope belt pulley facing each other at a distance S formed so as to be pressed against each other as shown in FIG. 6, 16, proceed in the P direction, and when riding on the plate-like inspection path 12 serving also as the negative electrode, the inspection is due to the speed difference (Vv) of the endless rope belts 4, 14 having different speeds. Advancing on the passage 12 by one rotation, it is transferred onto the belt conveyor 60 in the post-process after completion of the inspection.
[0017]
The inspection function and operation while passing through the inspection machine are almost the same as those in the first embodiment, and the detailed contents are omitted because they are duplicated.
[0018]
For other reference examples, the structure and function of inspecting a tilted subject in a rotating state are completely the same as in the first reference example, except that the tilt angle of the subject is in the transport direction or perpendicular direction. . That is, its operation is Ru der which can be easily inferred from the description of FIGS.
[0019]
As described above, the contents of each invention are based on the configuration in which the transport mechanism of a very common subject is inclined at a certain angle, and the buoyancy is used for air or gas in the subject while the subject is rotating. Since the liquid contact portion of the subject seal portion is always created at the time of inspection, the portion where no gas is present can be properly inspected, so that the entire seal portion can be efficiently inspected for pinholes.
[0020]
As a specific example of the above, a pinhole inspection machine of a flat upper lid seal part such as a honey bean cup is cited, but in the present invention, if the body of the subject is a cylindrical cross section or a pseudo-cylindrical cross section, If the inspection part is at the upper part, the present invention is not limited to a flat lid, but can be applied to inspections having a shape that is greatly deformed from a specific example such as a cap.
[0021]
In any of the above-described two embodiments, the conditions such as the mechanism, structure, and size are extremely simple and simple. Therefore, it is possible to provide an apparatus that can be manufactured at a very low cost for the required delicate functions.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the principle of a first reference example of the present invention.
FIG. 2 is also a plan view below the seal portion of the subject.
FIG. 3 is an explanatory view showing a state where the positive electrode is in sliding contact with the seal portion of the subject.
4 is a plan view of FIG. 3. FIG.
FIG. 5 is an explanatory diagram for explaining forms of an idle rope belt pulley and an electric rope belt pulley.
FIG. 6 is a plan view of an embodiment of the present invention.
FIG. 7 is a side view of the same.
FIG. 8 is a plan view of another reference example of the present invention .
FIG. 9 is a side view of the same.

Claims (2)

A non-insulating fluid content containing a slight amount of insulating gas such as air is sealed in the upper part of a substantially cylindrical sealed packaging container formed of an insulating material such as resin and having a substantially flat sealing surface on the upper surface. One electrode for applying a voltage to the sealing surface from the upper part of the packaging specimen, the other electrode for applying a voltage of a different polarity to a part of the packaging specimen, and the packaging specimen in parallel to the sealing face A conveying means for conveying in a direction and a power source for applying a voltage between the two electrodes are connected, and it is determined whether or not the packaged specimen has a pinhole or a seal failure based on a current value flowing between the two electrodes. In a pinhole inspection machine comprising a discriminating unit, the pinhole inspection machine has an inclining unit that inclines the packaged object conveyed by the conveying unit so that the seal surface forms a predetermined angle with respect to a horizontal plane, Abbreviation for packaging specimen A pair of endless belt conveyors having parallel opposed surfaces sandwiched from both sides and facing substantially parallel to each other, and having circumferentially opposed surfaces that move around in the transport direction at different speeds. A pinhole inspection machine configured to be driven to rotate around a central axis when nipped and conveyed by an opposing surface . 2. The pinhole inspection machine according to claim 1, wherein the power source is a DC power source .

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