JP3790664B2 - Pinhole detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for detecting a pinhole (small hole) in a container having a mouth attached to the container body.
[0002]
[Prior art]
This will be described with reference to FIG. The sheet 101 folded in two forms a container body 103 by bonding the peripheral edge portion 102 by means such as heat welding. Further, a mouth portion 104 is fixed to the upper portion of the container body 103, and this mouth portion 104 is also fixed by being thermally welded to the container body 103 (welding portion 105).
Next, an apparatus for detecting a pinhole in the welded portion 105 will be described. A pipe 107 made of a rubber-like elastic body is in pressure contact with the tip of the valve 106 from which air is ejected. Further, a pressure sensor 108 for measuring the pressure of the ejected air is provided between the valve 106 and the pipe 107.
[0003]
Next, a method for detecting a pinhole in the welded portion 105 will be described. First, the end of the pipe 107 is brought into close contact with the mouth portion 104, and air is sent from the valve 106 into the container body 103 until a predetermined pressure is reached. The prescribed pressure can be detected by the pressure sensor 108. Then, when a predetermined amount of air is blown, the ejection of air is stopped, and the pressure sensor 108 is monitored for about 30 seconds to 45 seconds for a while. Here, if the pressure sensor 108 does not change, it is determined that there is no pinhole, and the container is regarded as a good product. However, when the pressure sensor 108 is decreased by the above monitoring, air is leaking and a pinhole is formed, so that the container is a defective product.
[0004]
[Problems to be solved by the invention]
However, in the conventional technique described above, air can be sent into the container body 103 in about 1 second, but the process of monitoring the pressure change of the air takes time and the productivity is very poor. It was. Therefore, it is conceivable to shorten the time for monitoring the air pressure, but the smaller the pinhole, the more difficult the air leaks, and as a result, the decrease in pressure is delayed, so that a good product despite the fact that the pinhole is formed. This was very bad in terms of quality.
[0005]
[Means for Solving the Problems]
A first invention of the present invention for solving the above problems is a pinhole detector as set forth in claim 1 and is as follows.
An apparatus for detecting a pinhole in a container having a mouth attached to the container body, the electrode board being openable and closable so as to sandwich the heat welded part of the mouth of the container body, and the opening and closing operation of the electrode board The electrode rod is capable of entering the mouth portion of the container body in conjunction with the above.
A second invention of the present invention for solving the above-mentioned problems is a pinhole detector as described in claim 2 and is as follows.
In addition to the invention described in claim 1, the interlocking between the opposed electrode panel and the electrode rod is a configuration in which the link rod is used.
[0006]
[Action]
When there is no pinhole, no current is supplied. Conversely, when a pinhole is present (formed), current is leaked from the pinhole.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
This will be described with reference to FIGS. The base 1 receives a magazine 3 in which a large number of containers 2 are accommodated (in this embodiment, it is installed at two locations, but may be one location), and the containers 2 are delivered from the magazine 3. The supply turntable 4 is installed. The supply rotary table 4 is formed with six receiving portions 5 for receiving the containers 2 pushed out from the magazine 3 in a radial manner.
The base 1 is provided with an inspection table 6 that rotates intermittently in synchronization with the supply rotation table 4. In the inspection table 6, six notches 7 are formed radially, and a grip 8 is fixed to the notches 7. The gripping portion 8 is actuated by a known actuator in the opening direction with the support shaft S as a fulcrum, and is closed by a resilient member 9 such as a coil spring. Of course, the gripping portion 8 is a member for gripping the container 2 supplied from the supply rotary table 4, but does not grip the entire container 2 but grips the mouth portion 10. The gripping force is such that it cannot be removed by the centrifugal force generated by the rotation of the inspection table 6.
Reference numeral 11 denotes a stopper member for setting the closing interval of the gripping portion 8, and the closing interval is changed by the protruding amount of the screw 12.
[0008]
An electrode plate 13 made of a metal material having a curved portion formed in accordance with the shape of the mouth portion 10 of the container 2 is disposed and fixed below the grip portion 8. Further, a second electrode board 14 is located at a position facing the electrode board 13, and the electrode board 14 is fixed to a slide unit 15 of a column installed on the base 1. The slide unit 15 is retracted by the link rod 16, but the advance is made by the elastic force of the coil spring 9. That is, the mouth portion 10 is gripped by the notch portion 7 and the grip portion 8, but is also gripped by the two opposing electrode boards 13 and 14. Here, the positions of the electrode boards 13 and 14 also serve as the heat welding part 18 between the container body 17 and the mouth part 10 (see FIGS. 5 and 6).
[0009]
A top plate 19 is located above the inspection table 6, and an electrode bar 20 is arranged on the top plate 19 so as to be movable up and down. The electrode bar 20 is connected to the link bar 16 and moves up and down by the operation of the link bar 16. That is, the electrode board 14 and the electrode rod 20 operate in conjunction with each other. Specifically, when the electrode board 14 moves forward in the direction of the electrode board 13, the electrode bar 20 descends and enters the mouth portion 10.
An insulating cover 22 is installed at the junction between the electrode rod 20 and the electrode wire 21 so as not to pick up current from the electrode boards 13 and 14. In addition, an electrode wire 23 is also connected to the electrode boards 13 and 14, and the electrode wire 21 and the electrode wire 23 are connected to a high voltage generator.
[0010]
Reference numeral 24 denotes a non-defective product discharge chute for discharging a container determined to be non-defective after the container 2 has been inspected. Reference numeral 25 denotes a discharge board for discharging a container determined to be defective. The defective product comes into contact with the discharge board 25 by the rotation of the inspection table 6 and is forcibly isolated from the gripping portion 8 by the further rotation of the inspection table 6.
[0011]
Next, the operation will be described. The container 2 delivered from the supply rotary table 4 to the inspection table 6 stops at the position of the slide unit 15. Simultaneously with this stop, the slide unit 15 moves forward, and the electrode plate 14 comes into contact with the heat welding portion 18 of the container 2 to be pressed. And the heat welding part 18 is pinched | interposed by the two electrode boards 13 and 14 by this press-contact. At the same time, the electrode rod 20 descends and enters the mouth portion 10. The electrode rod 20 penetrates to the position of the heat welding portion 18 (see FIG. 7).
Here, the high voltage generator is operated to apply a high voltage to the electrode boards 13 and 14 and the electrode rod 20. At this time, if energization is not confirmed, it is determined that there is no pinhole and is regarded as a non-defective product, and the container is guided to the non-defective product discharge chute 24. However, when energization is confirmed, it is determined that there is a pinhole, and the defective product is forcibly discharged from the discharge board 25.
[0012]
【The invention's effect】
The present invention is an apparatus for detecting a pinhole of a container having a mouth part attached to the container body, and an electrode board that can be opened and closed facing the heat welding part of the mouth part of the container body, and the electrode board An electrode bar that can enter the mouth of the container body in conjunction with the opening and closing operation of the container, and the interlocking between the opposing electrode board and the electrode bar is made by a link bar , accurately, Inspection can be performed quickly, and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a top view of the present invention.
FIG. 2 is a side view of the present invention.
3 is an enlarged view (portion A) of the main part of FIG. 1. FIG.
FIG. 4 is an enlarged view (B part) of the main part of FIG.
FIG. 5 is a top view of a heat welded portion held by an electrode board.
FIG. 6 is a side view of the container.
FIG. 7 is a side view for explaining the operation.
FIG. 8 is a side view showing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Container 3 Magazine 4 Supply rotation table 5 Receiving part 6 Inspection table 7 Notch part 8 Gripping part 9 Repelling member 10 Mouth part 11 Stopper member 12 Screw 13 Electrode board 14 Electrode board 15 Slide unit 16 Link rod 17 Container Main body 18 Heat welding part 19 Top plate 20 Electrode rod 21 Electrode wire 22 Insulating cover 23 Electrode wire 24 Non-defective product discharge chute 25 Discharge disc

Claims (2)

An apparatus for detecting a pinhole in a container having a mouth attached to the container body, the electrode board being openable and closable so as to sandwich the heat welded part of the mouth of the container body, and the opening and closing operation of the electrode board A pinhole detector comprising an electrode bar that can be inserted into the mouth of the container body in conjunction with the container . The pinhole detector according to claim 1, wherein the electrode plate and the electrode rod facing each other are linked by a link rod .

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