JP2001324407A - Portable pinhole inspection machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable pinhole inspection machine capable of surely discovering a pinhole in any shape of inspection object. SOLUTION: In a portable case, a detection electrode for putting an inspection object and a discharge cylinder provided with a high voltage electrode for impressing high voltage to the inspection object are detachably contained. A controller for judging existence of discharge by generating a high voltage and judging the existence of pinhole in the inspection object is contained. An inspection stage consisting of electric isolation material in which upper part detection electrodes are placed is detachably contained in the constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable pinhole inspection machine.

[0002]

2. Description of the Related Art If there is a pinhole in a film of a food container or a glass of a chemical ampoule, bacteria or the like may enter from the pinhole and the quality of the contents may be changed.
Therefore, pinhole inspection is performed in the manufacturing process of food and medicine. A general pinhole inspection is performed on a test object having an electrically insulating property in which a conductive content is enclosed, and a high-voltage electrode attached to the tip of a discharge tube is placed on the detection electrode. And a high voltage is applied to the object to be inspected. Then, a spark discharge (hereinafter simply referred to as discharge) occurs in a portion where the pinhole exists. Therefore, the presence or absence of the discharge is detected from the current flowing through the detection electrode to determine the presence or absence of the pinhole.

In many cases, such a pinhole inspection is performed by incorporating a large-sized pinhole inspection machine equipped with a conveyor for transporting an inspection object into a production line. However, diversification of product types makes it costly and difficult to introduce pinhole inspection machines in all production lines. Therefore, a portable pinhole inspection machine has been proposed to perform a pinhole inspection for various types of products (see Japanese Patent Application Laid-Open No. 10-300727).

In a conventional portable pinhole inspection machine, a control unit, a discharge tube, detection electrodes, and the like are housed in a portable case. Carry this box to the production line,
The discharge tube and the detection electrode were taken out of the case, electrically connected to the control unit, and a pinhole inspection of the product was performed near the production line.

[0005]

In the vicinity of a production line such as a food factory, a stainless steel work desk is often used for sanitary reasons, and pinhole inspection is performed on such a conductive stainless steel work desk. May be done. On the other hand, portable pinhole inspection machines perform inspections on inspection objects of all shapes, so when the inspection object is larger than the sensing electrode, the protruding inspection object hangs down and becomes a conductive work table. May come in contact. Then, a part of the discharge current flows toward the work desk, and the current flowing to the detection electrode is weakened, so that the presence of the pinhole may not be detected without detecting the discharge. In addition, since the type of the high-voltage electrode is fixed, the high-voltage electrode cannot be brought into contact with the surface of the object to be inspected depending on the shape of the object to be inspected. There was a possibility that the presence of the pinhole could not be detected because the discharge could not be generated at the pinhole portion. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a portable pinhole inspection machine capable of surely finding a pinhole in an object to be inspected of any shape, focusing on the above problem.

When a pinhole inspection is performed on a conductive stainless steel work desk, the distance from the work desk becomes short, particularly when a high-voltage electrode is brought close to the end of the inspection object.
Erroneous discharge from the high-voltage electrode to the work desk could pose a danger to the inspector. Further, there is a case where the discharge tube is left while the high voltage is generated on the electrode of the discharge tube by mistake, and there is a risk that a person other than the inspector touches the high voltage electrode without knowing the generation of the high voltage.

Therefore, the present invention focuses on the above-mentioned problems, and does not cause erroneous discharge from a high-voltage electrode to a conductive work desk during an inspection, and does not leave a discharge tube while a high voltage is generated. The purpose is to provide a mold pinhole inspection machine. In addition, another object of the present invention is to provide a portable pinhole inspection machine that is lightweight, easy to carry, and easy to operate.

[0008]

In order to achieve the above-mentioned object, a portable pinhole inspection apparatus according to the present invention comprises a portable case, a detection electrode for mounting an object to be inspected, and a heightened height of the inspection electrode. A discharge cylinder equipped with a high-voltage electrode for applying a voltage is housed so as to be able to be taken out, and a control unit for generating a high voltage and detecting the presence or absence of a discharge to determine the presence or absence of a pinhole in the inspection object is housed, An inspection table made of an electrically insulating material, on which the detection electrode is provided, is housed in the case so as to be removable.

Further, the detection electrode is formed so that a metal plate functioning as a detection electrode corresponding to the size of the object to be inspected can be mounted. Further, the detection electrode is formed so that a metal plate functioning as a detection electrode corresponding to the size of the object to be inspected can be placed thereon, and the inspection table made of an electrically insulating material having the detection electrode installed thereon can be taken out. It was configured to be housed in the case.

On the other hand, a high-voltage generating switch is provided in the grip portion of the discharge tube, in which the control unit and the discharge tube conduct only when the switch is pressed, and a high voltage is generated at the high-voltage electrode. Further, the discharge tube is configured such that the high-voltage electrode is exchangeable.

On the other hand, the detection electrode and the discharge cylinder are:
The control unit is previously electrically fixedly connected to the control unit by a telescopic cord. Also, a detection lamp that holds on when the control unit detects a discharge, on the cord connecting the discharge tube and the control unit or on a grip portion of the discharge tube, and turns off the detection lamp. And a reset switch to be set.

[0012]

[Function] Since the inspection table made of an electrically insulating material with the detection electrode set on the upper part is housed in a case so that it can be taken out, the object to be inspected does not come into contact with the work desk.
Even when a pinhole inspection is performed on a conductive work desk, a sufficient current flows to the detection electrode without a part of the discharge current flowing to the work desk, and the pinhole can be reliably found. In addition, the detection electrode is configured so that a metal plate that functions as a detection electrode corresponding to the size of the inspection object can be placed, so if the metal plate is placed on the detection electrode, work can be performed on a large inspection object. No more touching the desk,
As described above, the pinhole can be reliably found.

Also, since the inspection electrode is provided with an inspection table made of an electrically insulating material provided on the upper part, the distance between the high-voltage electrode and the conductive work table can be ensured, and the work table during inspection can be secured. No erroneous discharge occurs.

Further, the detection electrode is formed so that a metal plate functioning as a detection electrode corresponding to the size of the object to be inspected can be mounted thereon, and an inspection table made of an electrically insulating material on which the detection electrode is installed can be taken out. In addition, since the inspection table is configured to be stored in the case, the height of the inspection table can be reduced, and the inspection table can be reduced in weight and can be easily carried.

On the other hand, since the control unit and the discharge tube conduct only when the switch is pressed, a high voltage generating switch for generating a high voltage at the high voltage electrode is provided at the grip portion of the discharge tube. When the hand is released, the switch is turned off and the high voltage state is eliminated, so that the discharge cylinder is not left with the high voltage generated.

Further, since the discharge cylinder has a structure in which the high-voltage electrode is formed so as to be exchangeable, a high-voltage electrode corresponding to the shape of the object to be inspected can be selected and used. Pinholes can be reliably found for a test object having a shape.

On the other hand, since the detecting electrode and the discharge tube are electrically fixedly connected to the control unit in advance by a telescopic cord, there is no need to electrically connect to the control unit again, and the operation is simple. become.

Also, a detection lamp for holding the lighting when the control unit detects a discharge, and a reset for canceling the lighting of the detection lamp, on the cord connecting the discharge tube and the control unit or on the grip portion of the discharge tube. Since the switch and the switch are installed, the detection lamp can be checked at hand, and the reset switch can be operated at hand, which simplifies the operation.

[0019]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a portable pinhole inspection machine according to the present invention. The portable pinhole inspection machine 1 includes a control unit 3 and a storage unit 4 inside a portable case 2. In the storage section, an inspection table 34a on which a detection electrode for mounting an object to be inspected is installed, a high voltage electrode 62a for applying a high voltage to the object to be inspected, a discharge tube 50a to which the high voltage electrode is attached, and the like are removably housed. are doing. On the other hand, a control unit that generates a high voltage and detects the presence / absence of a discharge to determine the presence / absence of a pinhole in the object to be inspected is fixedly housed in a case. The case is made of duralumin or the like so as to be light in weight so that it can be carried, and the case is formed in the size of an attache case. Further, a handle 5 is provided so as to be portable.

First, the control section 3 will be described. FIG. 2 shows a block diagram of a portable pinhole inspection machine. The control unit is divided into a high pressure generation unit 91 and a detection determination unit 92. The high voltage generator 91 has a power supply circuit 72 that receives power from a commercial power outlet. After the high voltage is further adjusted by the high voltage adjusting volume 12, the voltage is converted into a DC voltage by the rectifier circuit 74. This voltage value is monitored by the high voltage meter 13. Further, it is connected to the discharge tube 50 via a pulse oscillation circuit 75.

On the other hand, a voltage value at both ends of the pickup coil 82 connected to the detection electrode 30 is input to the detection determination unit 92, and the voltage value is amplified by the amplifier circuit 83. Is provided with a sensitivity adjustment volume 14 that can change the sensitivity. Even when the discharge current is small, the discharge can be detected and the pinhole can be reliably found by increasing the amplification factor of the signal from the detection electrode. After the amplified voltage value passes through a filter 84 for cutting noise, the amplified voltage value is input to a determination circuit 85 for determining whether or not the voltage is generated by discharge. The determination circuit has a level indicator 15 for displaying a voltage value, a signal difference between a case where the object to be measured has a pinhole and a case where there is no pinhole can be confirmed, and high-voltage adjustment and sensitivity adjustment can be easily performed. Further, a detection lamp 16 and an alarm 1 for displaying a warning when it is confirmed that the voltage is generated by the discharge.
8 Although the discharge is instantaneous, once the detection lamp is turned on, the detection lamp is configured to be kept turned on until the reset switch 17 on the control panel is pressed, thereby ensuring the detection of the pinhole.

Next, the detection electrodes will be described. The detection electrode 30 in FIG. 1 is formed in a square shape by a metal plate such as stainless steel having conductivity. Generally, the size of the sensing electrode is
In order to prevent direct discharge from the high voltage electrode to the detection electrode, the size is set to be equal to or slightly smaller than the size of the inspection object.
It is complicated to electrically connect the detection electrode and the control unit every time the inspection is performed, and the pinhole inspection may be performed at a place slightly away from the place where the portable case 2 is placed. The control unit and the control unit installed in the case are connected in advance by a curl cord 32 that can be extended and contracted.

Further, the detection electrode is placed on the upper surface of an inspection table 34 formed in a block shape from an electrically insulating material such as resin. The height of the inspection table is a height that is not affected by the conductive work table when the inspection table is placed on a conductive work table and a pinhole inspection is performed. FIG. 3 is an explanatory diagram of an inspection table and detection electrodes corresponding to the size of the inspection object. FIG. 1A is an explanatory diagram of the inspection table. First, the height 34h of the inspection table which is not affected by the work table 36 having conductivity means that the height of the inspection table 34
3 is the height of the inspection table where the inspection object 41 and the work desk 36 do not come into contact with each other even when the projection 1 protrudes and hangs down.
1h is the height of the inspection table that does not become 0. And second
In addition, when the high voltage electrode 62 approaches the end of the inspection object 41, the height of the inspection table does not cause erroneous discharge from the high voltage electrode 62 to the work desk 36. Is the height of the inspection table where no occurrence occurs. For example, when a discharge tube capable of applying a voltage of up to about 16 kV is used, erroneous discharge may occur if the distance between the high-voltage electrode and the worktable is about 10 mm. The first and second conditions are as follows:
Since each of them depends on the characteristic of the inspection object, the determination is made in consideration of the specific characteristic of the inspection object to be inspected by the portable pinhole inspection machine. For example, when using a discharge tube capable of applying a voltage of up to about 16 kV and performing pinhole inspection on food packaging containers in general as an object to be inspected, if the height of the inspection table is about 50 mm, conductive stainless steel is used. It is not affected by the work table.

On the other hand, the area of the upper surface of the inspection table is made as large as possible in order to prevent erroneous discharge to the work desk due to the end of the placed inspection object hanging down. However, the height and the area of the upper surface of the inspection table cannot be so large because of the restriction for storing in a portable small case.

Therefore, instead of making the height and the area of the upper surface of the inspection table particularly large, a metal plate which functions as a detection electrode corresponding to the size of the inspection object by being placed on the detection electrode is used. The detection electrode is formed so that a metal plate can be placed thereon. FIG. 3B is an explanatory view of the metal plate.
Here, the metal plate 42 corresponding to the size of the inspection object 41 is, specifically, when the metal plate 42 is mounted on the inspection table 34 and the inspection object 41 is further mounted thereon. Means a metal plate having a shape such that the end 41a of the inspection object does not hang down at a position lower than the vertical height of the detection electrode 30. In FIG. 3A, the end 41a of the inspection object hangs down to a position 41h lower than the height 34h of the detection electrode 30, but in FIG. It is located above and does not hang down below the height of the sensing electrode. The shape of the metal plate is individually set in consideration of the specific shape of the inspection object to be inspected by the portable pinhole inspection machine. The metal plate formed as described above functions as a detection electrode by directly or indirectly contacting with the original detection electrode 30 via a conductive substance. When the original detection electrode directly mounts the metal plate, the detection electrode is formed to be one step higher than the surface of the inspection table so that both can always be in contact with each other, and a projection is provided on the detection electrode. When a metal plate is fixed on an inspection table with screws or the like in order to ensure the stability of the object to be inspected, screw holes and the like are provided on the detection electrode and the inspection table, and mounting holes are also provided on the metal plate.

If the inspection table and the metal plate are used together, the height of the inspection table can be reduced. That is, FIG.
In (2), if the metal plate 42 is used, the inspection object 4
1 does not hang down to a position lower than the vertical height of the detection electrode, so that a distance 62h between the high-voltage electrode 62 and the work table 36 having conductivity can be ensured. There is no need to increase 34h.

Next, the discharge tube will be described. The discharge tube 50 in FIG. 1 includes a connection cord 51, a grip portion 54, a transformer portion 60, and a high-voltage electrode 62. The connection cord 51 connects the grip section and a control section installed in the case. Since it is complicated to electrically connect the detection electrode and the control unit every time the inspection is performed, the pinhole inspection may be performed at a place slightly away from the place where the case is placed. The control unit is connected in advance with a curl cord 52 that can be extended and contracted. Further, in the vicinity of the grip portion 54 of the connection cord, similarly to the control panel, a detection lamp 16a which is turned on by a signal from the control unit when the control unit detects a discharge and holds the light emission, and a reset switch which cancels the light emission. 17a and the like are attached to enable the detection confirmation and the reset operation at hand.

The grip portion 54 is a portion that the inspector grips when moving the discharge tube so that the high-voltage electrode 62 approaches the surface of each portion of the inspection object. Therefore, it is formed in a thickness that is easy to grasp and a length that is easy to handle. The detection lamp 16a and the reset switch 17a attached to the connection cord 51 described above may be provided on the grip. Also, the discharge tube may be left unattended while high voltage is being generated on the high-voltage electrode, and there is a danger that anyone other than the inspector may touch the high-voltage electrode without knowing the generation of the high voltage. 56 are provided. The high-voltage generation switch is a switch in which the control unit and the discharge tube conduct only when the switch is pressed, and a high voltage is generated at the high-voltage electrode. When the switch is released, the switch automatically returns to eliminate the high voltage. It is. The switch is provided at a position near the center of the grip so that the inspector can easily keep pressing the switch while holding the grip, and if the operator leaves the switch unattended, the switch is surely turned off. Further, for safety, a high voltage generation display lamp 57 which is turned on when a high voltage is generated is provided.

The high-voltage electrode 62 is composed of a high-voltage electrode main body and a specially shaped electrode such as a brush-type electrode or a needle-type electrode formed at the tip thereof, and applies a high voltage to the object to be inspected. FIG. 4 shows an explanatory view of a structure for mounting a high-voltage electrode. In order to select and use a high-voltage electrode corresponding to the property of the object to be inspected, if the high-voltage electrode is replaceable, the whole body and the special-shaped electrode can be replaced. And a case where the exchange is possible. The high-voltage electrode 62 is attached by screwing the male screw portion 61a of the main body 61 to the female screw portion 60b provided at the tip of the transformer portion 60, and is formed to be removable and replaceable.
Further, the specially shaped electrode 63 is also formed such that the male screw portion 63a is screwed into the female screw portion 61b provided on the high-voltage electrode main body 61, and is detachably replaceable.

FIG. 5 shows explanatory diagrams of various specially shaped electrodes. When the inspection object is a packaging container that is easily damaged or a container having an uneven surface, a brush-type electrode 64 formed of a metal brush that can be freely deformed is used. As long as it can be freely deformed, it is not limited to a brush but may be a fine chain, or a so-called ball chain in which metal balls are continuously formed. Furthermore, the same brush type electrode having different bristle lengths and number of hairs is prepared to select and use a type corresponding to the property of the surface of the object to be inspected and generating a discharge reliably in the pinhole portion. When a high voltage needs to be applied in a concentrated manner, such as when the object to be inspected is made of glass, the needle-shaped electrode 65 is used. Further, in the case of a glass container such as a neck portion of a chemical ampoule to be prevented from being damaged, a spring type electrode 66 is used. On the other hand, when the inspection efficiency is more important than the concentration of the high voltage, the plate-shaped electrode 67 is used.

Next, a pinhole inspection method using the portable pinhole inspection machine according to the present invention will be described. First, a general procedure will be described. First, the case containing the control unit, the inspection table, the discharge tube and the like is carried to a place where the pinhole inspection is performed, and the inspection table and the discharge tube are taken out of the case. Next, an inspection table is set so that the detection electrode faces upward, and the inspection object is placed on the detection electrode. Next, the power is turned on, and a voltage adjusted to the object to be inspected is set by the high-voltage adjustment volume. Next, grasp the grip of the discharge tube and press the high voltage generation switch to generate high voltage on the high voltage electrode,
A high voltage is applied to the inspection object by bringing the high voltage electrode close to the surface of the inspection object.

Next, the discharging operation will be described. FIG. 6 shows an equivalent circuit diagram of the pinhole inspection device. In FIG.
C1 is a capacitor formed between the high-voltage electrode of the discharge tube and the conductive content in the test object, R is the electrical resistance of the content, and C2 is formed between the content and the detection electrode. Shows a capacitor. Since the test object is made of an electrically insulating material, the spark voltage Vsa when there is no pinhole in the portion C1 is different from the spark voltage Vsb when there is a pinhole. Here, the spark voltage is a minimum voltage at which spark discharge can be generated. Therefore, by setting the voltage applied to the test object to a voltage value between Vsa and Vsb, spark discharge can be generated only in the portion where the pinhole exists. Since the values of Vsa and Vsb vary depending on the object to be inspected, it is desirable to investigate the voltage to be set in advance by experiment using a sample of the object to be inspected having a pinhole intentionally. At the start, Vsb may be found while performing high-voltage adjustment using a test object without pinholes, and may be set to a slightly lower voltage.

Next, the operation of detecting a pinhole will be described. When discharge occurs and the C1 portion is short-circuited, the C2 portion having a very small spark voltage as compared with the C1 portion is also short-circuited, and a current flows to the detection electrode. Further, since the current flows through the pickup coil connected to the detection electrode, the current value is converted into a voltage value by detecting a potential difference between both ends of the coil. Note that a resistor may be used instead of the coil. The determination circuit determines whether the voltage value thus detected is due to discharge. Whether or not the voltage value is due to the discharge is recorded in the above-mentioned experiment using the sample of the inspected object provided with the intentionally provided pinhole, in the same manner as when the discharge is generated. Judge by comparing with this. The voltage value is displayed step by step on a level indicator provided in the control unit, and when a discharge is confirmed and a pinhole is detected, a detection lamp is turned on. Although the discharge is instantaneous, the detection lamp continues to light until the reset switch is pressed, so that the inspector can confirm the detection of the pinhole. Since the detection lamp and the reset switch are also provided on the cord connecting the discharge tube and the control unit, the inspector can check the discharge at hand.

Although the above description has been made of the case where a DC voltage is applied, a pinhole may be detected by measuring a decrease in the impedance of the portion C1 after applying an AC voltage. In addition, the presence of the pinhole may be determined by visually detecting the spark generated by the spark discharge without using the determination circuit to determine the presence of the pinhole. May be determined.

Next, the operation of the inspection table to prevent detection leakage and the operation of preventing erroneous discharge will be described. When a pinhole inspection is performed on an inspection object larger than the detection electrode on a stainless steel work desk, the inspection object protruding from the detection electrode may come into contact with a conductive stainless steel work desk. In this case, a part of the discharge current flows to the work desk, and the current flowing to the detection electrode becomes weak, so that the presence of the pinhole may not be detected without detecting the discharge. In addition, since stainless steel has conductivity, erroneous discharge from a high-voltage electrode to a work desk may cause danger to an inspector. In particular,
When the voltage applied to the test object is high and the high-voltage electrode is brought close to the end of the test object, the distance between the high-voltage electrode and the conductive work desk becomes short, causing erroneous discharge. Could be. Therefore, the detection electrode is placed on an inspection table having electrical insulation, and the height of the inspection table is increased, so that the object to be inspected does not come into contact with the work table, and the distance between the high-voltage electrode and the work table is reduced. Is secured.
Then, the spark voltage between the content and the work desk becomes higher than the spark voltage between the content and the detection electrode, and when a discharge occurs, the content and the detection electrode are short-circuited, and the discharge current is reduced. It flows to the sensing electrode. Therefore, discharge can be reliably detected and pinholes can be reliably detected. In addition, since the spark voltage increases as the distance between the electrodes increases, the occurrence of erroneous discharge can be reduced.

Next, a description will be given of the function of preventing the detection leakage by the metal plate. Since the detection electrode is formed so that a metal plate can be placed on it, the end of the inspection object can be detected by using a metal plate corresponding to the size of the inspection object on the detection electrode. It does not protrude from the electrode and hang down to a position lower than the vertical height of the detection electrode. Then, the object to be inspected does not contact the work desk, a part of the discharge current does not flow toward the work desk, a sufficient current flows to the detection electrode, and the discharge can be detected to detect the pinhole without fail.

When the inspection table and the metal plate are used in combination, it is possible to prevent erroneous discharge without increasing the height of the inspection table. In other words, if a metal plate is used, the end of the inspection object does not protrude from the detection electrode and does not hang down at a position lower than the vertical height of the detection electrode, so even if the height of the inspection table is not so high, Since the distance between the high-voltage electrode and the conductive work desk is ensured, erroneous discharge can be prevented. Further, if the inspection table is lowered, the weight can be reduced, and it is easy to store it in a case and at the same time to carry it easily.

Next, the operation of the high voltage generating switch will be described. In some cases, the discharge tube is left unattended while a high voltage is generated on the high-voltage electrode of the discharge tube by mistake, and there is a risk that a person other than the inspector may touch the high-voltage electrode without knowing the generation of the high voltage. Therefore, only when the switch is pressed, the control unit and the discharge tube conduct, and a high voltage is generated on the high voltage electrode. When the hand is released from the switch, the switch automatically returns to eliminate the high voltage. Is provided. As a result, the switch is turned off when the hand is released from the discharge tube, and the high voltage state is eliminated, so that the discharge tube is not left while the high voltage is generated.

Next, a description will be given of the function of preventing detection leakage by making the high-voltage electrode replaceable. If the type of high-voltage electrode is fixed, the high-voltage electrode cannot be brought into contact with the surface of the object to be inspected depending on the shape of the object to be inspected, and high voltage can be applied concentratedly depending on the material of the object to be inspected. In some cases, discharge cannot be generated at the pinhole portion at the initially set voltage. Therefore, the high-voltage electrode is replaceable, and in the case of an inspection object having an uneven surface, a brush-type electrode formed of a metal brush that can be freely deformed is used. Then, the tip of the electrode can be evenly brought into contact with the uneven surface of the inspection object, and a pinhole can be reliably found by generating discharge. In addition, by using a freely deformable brush-type electrode, a pinhole inspection can be performed without damaging the surface of the inspection object. Since the spring-type electrode can be freely deformed to prevent scratches, it can be used in contact with the surface of the inspection object. On the other hand, when the spark voltage is high, such as when the object to be inspected is made of glass, it is necessary to apply a high voltage in a concentrated manner, and thus a needle electrode is used. As a result, even when the object to be inspected is made of glass or the like, a pinhole can be reliably found by generating a discharge. Note that the needle-shaped electrode and the plate-shaped electrode are used without being brought into contact so as not to damage the inspection object.

As described above, in a portable case,
The detection electrode on which the object to be inspected is placed and a discharge tube provided with a high-voltage electrode for applying a high voltage to the object to be inspected are housed so that they can be taken out, and a high voltage is generated to detect the presence or absence of a discharge, thereby detecting the object. A control unit for judging the presence or absence of a pinhole in the object is housed, and the inspection table made of an electrically insulating material with the detection electrode installed on the top is configured to be housed in the case so that it can be taken out. Pinholes can be reliably found for objects. In addition, even if the detection electrode is configured so that a metal plate that functions as a detection electrode corresponding to the size of the inspection object can be placed, pinholes can be reliably found for the inspection object of any shape. can do. In addition, since the inspection electrode is provided on the upper surface and the inspection table is made of an electrically insulating material, no erroneous discharge occurs during the inspection.

Further, the detection electrode is formed so that a metal plate functioning as a detection electrode corresponding to the size of the object to be inspected can be mounted thereon, and an inspection table made of an electrically insulating material with the detection electrode installed thereon can be taken out. Since it is configured to be housed in the case, the weight can be reduced and the device can be easily carried.

On the other hand, since the control unit and the discharge tube are electrically connected only when the switch is pressed to generate a high voltage at the high voltage electrode, a high voltage generating switch is provided at the grip of the discharge tube. There is no possibility that the discharge cylinder is left unattended. In addition, since the discharge tube has a configuration in which the high-voltage electrode is formed to be replaceable, pinholes can be reliably found with respect to the inspection object having any shape.

On the other hand, since the detection electrode and the discharge tube are electrically fixedly connected to the control unit in advance by a telescopic cord, the operation is simplified. Further, a detection lamp for holding lighting when the control unit detects discharge, and a reset switch for canceling lighting of the detection lamp, on the cord or the grip portion of the discharge tube connecting the discharge tube and the control unit. The operation is simplified because of the installed configuration.

[0044]

According to the present invention, a detection electrode for mounting an object to be inspected and a discharge tube having a high voltage electrode for applying a high voltage to the object to be inspected are removably housed in a portable case to generate a high voltage. A control unit for detecting the presence / absence of discharge and determining the presence / absence of a pinhole in the object to be inspected is housed, and an inspection table made of an electrically insulating material with a detection electrode provided thereon is housed in the case so that it can be taken out. Because of this configuration, pinholes can be reliably found for inspection objects of all shapes.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a portable pinhole inspection machine according to the present invention.

FIG. 2 is a block diagram of a portable pinhole inspection machine.

FIG. 3 is an explanatory diagram of a test object and a metal plate corresponding to the size of the test object.

FIG. 4 is an explanatory diagram of a mounting structure of a high-voltage electrode.

FIG. 5 is an explanatory view of various specially shaped electrodes.

FIG. 6 is an equivalent circuit diagram of the pinhole inspection device.

[Explanation of symbols]

1 ... Pin-hole inspection machine 2 ... Case 3
...... Control part, 4 ...... Storage part, 5 ...... Handle, 12
…… High pressure adjustment volume, 13 …… High pressure meter, 1
4 Sensitivity adjustment volume 15, Level indicator 16, 16a Detection lamp 17, 17a
...... Reset switch, 30 ... Detection electrode, 32 ...
…… Curl cord, 34, 34a …… Inspection table, 34h
……… Height, 36 …… Work desk, 41 …… Inspection object,
41h ... height, 42 ... metal plate, 50, 50a ...
... Discharge tube, 51... Connection cord, 52... Curl cord, 54... Grip part, 56... High-voltage generating switch, 57... High-voltage generating lamp, 60. , 60b ... female screw part, 61 ... high voltage electrode body, 61a ... male screw part, 61b ... female screw part, 62, 62a ... high voltage electrode, 62h ... height, 63 ... Special shaped electrode, 63a ... male screw part, 64 ... brush type electrode, 65 ... needle type electrode, 6
6: spring type electrode, 67: plate type electrode, 91
……… High pressure generating section, 92

Claims (7)

[Claims] 1. A portable case in which a detection electrode for mounting an object to be inspected and a discharge tube having a high voltage electrode for applying a high voltage to the object to be inspected are removably housed to generate a high voltage. A control unit for detecting the presence / absence of discharge and judging the presence / absence of a pinhole in the object to be inspected is housed, and the inspection table made of an electrically insulative material having the detection electrode provided thereon can be taken out of the case. Portable pinhole inspection machine characterized by storing. 2. A high voltage is generated by storing a detection electrode on which a test object is mounted and a discharge tube having a high voltage electrode for applying a high voltage to the test object in a portable case. A control unit for detecting the presence / absence of discharge and judging the presence / absence of a pinhole in the inspection object is housed therein, and the detection electrode is provided with a metal plate functioning as a detection electrode corresponding to the size of the inspection object. A portable pinhole inspection machine characterized by being formed so as to be capable. 3. A high voltage is generated by accommodating a detection electrode on which a test object is placed and a discharge tube having a high voltage electrode for applying a high voltage to the test object in a portable case. A control unit for detecting the presence / absence of discharge and judging the presence / absence of a pinhole in the inspection object is housed therein, and the detection electrode is provided with a metal plate functioning as a detection electrode corresponding to the size of the inspection object. A portable pinhole inspection machine characterized in that an inspection table made of an electrically insulating material, which is formed so as to be capable of being mounted thereon and which is provided with the detection electrode thereon, is removably stored in the case. 4. A high voltage is generated by accommodating a detection electrode on which a test object is mounted and a discharge tube having a high voltage electrode for applying a high voltage to the test object in a portable case. A control unit for detecting the presence / absence of electric discharge and judging the presence / absence of a pinhole in the object to be inspected is housed. A portable pinhole inspection machine, wherein a high voltage generation switch for generating a voltage is provided on a grip portion of the discharge tube. 5. A high voltage is generated by accommodating a detection electrode on which a test object is placed and a discharge tube having a high voltage electrode for applying a high voltage to the test object in a portable case. And a control unit for detecting the presence / absence of discharge to determine the presence / absence of a pinhole in the object to be inspected, and the discharge cylinder is formed so that the high-voltage electrode is replaceable. Hall inspection machine. 6. The control device according to claim 1, wherein the detection electrode and the discharge tube are electrically fixedly connected to the control unit in advance by a telescopic cord. Portable pinhole inspection machine. 7. A detection lamp for holding lighting when the control unit detects a discharge, on a cord connecting the control unit and the discharge tube or on a grip portion of the discharge tube; 7. The portable pinhole inspection device according to claim 6, further comprising a reset switch for canceling lighting.