JP2006153496A - Hammering test device and hammering test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve inspection performance by a hammering test by suppressing "beats" generated in a hammering test signal by adopting a means for inhibiting the jump-up of a pressure vessel. <P>SOLUTION: A secondary vibration inhibiting means 40 (for example, a suction means 41a) for inhibiting the jump-up of the pressure vessel C that has received electromagnetic shock is provided at the hammering test device 1, thus inhibiting the occurrence of vibration at a part other than the hammering test vibration part in the pressure vessel C and hence eliminating "beats" occurring in a hammering test signal and improving inspection performance by a hammering test. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention receives a tapping sound emitted from a tapping vibration unit of a can body subjected to electromagnetic shock, analyzes a tapping signal converted from this tapping sound, detects a can internal pressure, and detects a defective can. More particularly, the present invention relates to a percussion apparatus and a percussion method that improve the detection accuracy of defective cans by suppressing “beats” generated in a percussion signal waveform.

  Conventionally, the percussion method has been widely adopted as a method for nondestructively inspecting the internal pressure of a sealed container, particularly canned food or the like filled with foods and beverages that are susceptible to corruption. In the percussion method, a percussion sound generated when an electromagnetic shock is applied to the percussion vibration part provided on the lid of the can (the bottom of the can in the case of a two-piece can) is converted into an electrical signal by a microphone, thereby This is an inspection method for determining the quality of internal pressure.

For example, in the case of canned low milk beverages containing milk such as coffee containing milk, in order to reduce the viscosity during sterilization and filling, the beverage is usually filled in a can at a high temperature of 65 ° C. to 95 ° C. Since it is wound and sealed, it becomes a negative pressure can when cooled to room temperature, but when it rots and ferments, it generates gas in the can and the pressure rises, resulting in a low positive pressure can. In addition, when the negative pressure can is sealed imperfectly, outside air enters the can and the pressure rises.
Therefore, impact is applied to a portion of the can, and the internal pressure of the can is detected by analyzing the echo vibration of the can to determine whether the contents are corrupt or the seal of the can is good, thereby eliminating defective cans. . Regarding the relationship between pressure and vibration, the larger the difference between the pressure inside the can and the outside air pressure, the more the can wall is stretched, and the natural vibration of the can becomes higher, resulting in a high sound. That is, if the material of the can, the size, the thickness, and the shape of the can, such as a two-piece can or a three-piece can, are the same, the echo vibration depends mainly on the internal pressure of the can.

In the percussion detection method, a reverberation vibration sound (percussion sound) generated when an impact is applied by an exciter coil (electromagnetic coil) is detected by a microphone. It is the natural vibration of the can that shows the peak value in the frequency distribution of the detected vibration sound. The quality of the can is judged by checking whether this value is in the frequency band corresponding to the appropriate pressure inside the can. Canned products are removed by a rejector etc. in the post-inspection process.
Negative pressure cans have a degree of vacuum in the range of 27 to 80 kPa, have little pressure variation, and have a large change in natural frequency due to fluctuations in internal pressure. There is an advantage in that it is possible to accurately detect corruption of contents. However, in the case of negative pressure canning, there is a problem that a rigid can body that can withstand negative pressure is required, the side walls are thicker than the positive pressure can, and the manufacturing cost is high.

  Further, since the three-piece can is formed by rounding the side wall portion of the flat plate, it is difficult to transport the thin flat plate, and thus the thin and light weight cannot be reduced. In order to solve the above-described problems of the three-piece can, a two-piece can is formed by thinning the side wall of the can body by drawing-ironing, drawing-stretching-ironing, etc. and integrally forming the bottom and the side wall. It has been adopted. Furthermore, in order to reduce the manufacturing cost of the above two-piece can, an inert (liquefied / misted / solidified) gas such as liquid nitrogen is filled at the time of sealing so It has been proposed to make the side wall of the two-piece can thinner by compressing and imparting rigidity with the pressure inside the can.

This can with reduced positive pressure has a positive pressure inside the can, so it is difficult to dent against the external pressure, and the thickness of the can can be reduced. Furthermore, the can internal pressure accuracy can be increased by means such as filling with a mist of inert gas, and inspection by the percussion method can be performed (see Patent Document 1).
However, when the internal pressure of the two-piece can, which has been reduced in weight and weight, is inspected by the percussion device, the percussion sound becomes a complex vibration that includes a plurality of vibration mode components that produce a so-called “beat”. There was a problem of lack of suitability.
Here, “beat” is a phenomenon caused by the superposition of two vibrations having close frequencies, and in the case of percussion, “beat” occurs when the round shape of the can body to be measured is measured. This means that some extra vibration is excited and overlapped with the base vibration of the plate portion.

Conventionally, there has been proposed a method for accurately performing an internal pressure inspection of a two-piece can without being affected by such “beat”.
For example, in a sealed container having a bottom panel part inside a circumferential grounding part formed on the outer periphery of the bottom part, the shape of the bottom panel part is 100. The difference in the inspection frequency when the internal pressure of the can is 50 kPa and 0 kPa. Some have a curved surface shape of ˜2000 Hz (for example, see Patent Document 2). According to this technique, the frequency of the percussion sound generated during percussion can be set to a frequency band in which no “beat” occurs, and the inspection accuracy of the percussion method can be increased.

At the time when the prior art described in Patent Document 2 was developed, it was considered that the “beat” occurred due to the form of the two-piece can.
For example, in the case of a three-piece can, since the bottom lid is wound around the end of the body portion, the presence of the tightened portion causes a relatively simple vibration mainly composed of natural vibration such as drum vibration. It becomes. On the other hand, in the case of a two-piece can, since the trunk and the bottom are continuous, the location that becomes the end in vibration is not clear, and as a result, the percussion sound includes a plurality of vibration mode components. It was thought to be a complex vibration that produced a so-called “beat”.

  Furthermore, the material of the bottom part, which is a vibrating body, is a thin plate of tinned steel plate, tin-free steel, aluminum, etc., so it strongly affects the resonance of the can body and head space and the influence of the contents rather than the vibration itself. In particular, the vibration was thought to be a percussion sound including a more complicated “beat” due to the superposition of elements other than the internal pressure of the can as time passed from the impact.

JP 2000-128122 A JP 2003-040235 A

  However, the cause of occurrence of the above-mentioned “beat” is not essential but assumed. And the technique itself described in the above-mentioned patent document 2 has been proposed as a method for avoiding the “beat” that occurs, on the assumption that the “beat” occurs. In other words, in the past, the essential cause of “beat” has not been elucidated, and therefore, no decisive measure has been taken that can suppress “beat” itself.

Under such circumstances, the present inventor has conducted intensive research and examination over many years through trial and error in order to elucidate the cause of occurrence of “beat”. As a result, it has been found that the cause arises because the can body slightly jumps up when exciting the base vibration of the flat disk portion which is the percussion vibration portion by the electromagnetic pulse.
In other words, experiments and simulations have revealed that upward force is applied to the can body due to factors such as the strength of the electromagnetic pulse and the rigidity of the flat disk, and the can body unexpectedly jumps up from the floor surface unexpectedly. . Then, the jumped can body landed on the floor again, but extra vibration was generated in the can body due to the impact at this time.
Based on this knowledge, the present inventor repeated various experiments to prevent the can body from flying up even when electromagnetic shock was applied. It came to the conclusion that it was possible to suppress the occurrence of “buzz” when the internal pressure test was performed, and to improve the accuracy of canned quality determination.

  The present invention has been made in view of the above circumstances, and by taking measures to suppress the occurrence of vibrations other than the canning vibration portion of the can body, in particular, vibration caused by jumping up of the can body, An object of the present invention is to provide a percussion inspection device and a percussion inspection method capable of improving the accuracy of determination of quality of canned food by suppressing the generated “beat”.

  In order to achieve this object, the percussion inspection device of the present invention converts the percussion sound generated from the percussion vibration unit of the can body into an electromagnetic percussion signal by applying an electromagnetic shock to the can body and outputs the percussion signal. A tapping device comprising a head and an arithmetic unit for analyzing a tapping signal to detect the can internal pressure of the can body, and a portion other than the tactile vibration portion of the can body generated when an electromagnetic shock is applied The secondary vibration suppression means for suppressing the occurrence of vibration is provided.

When the percussion inspection device has such a configuration, since the secondary vibration suppressing means is provided, it is possible to suppress the secondary vibration caused by the impact received when the can body that has jumped up due to the electromagnetic shock has landed. For this reason, it is possible to suppress the “beat” generated in the tapping test signal waveform, and it is possible to increase the accuracy of can quality determination by the tapping method.
Accordingly, the inspection performance of the thin and light can body can be improved, and the safety of the can body can be improved. At the same time, the economical and environmental protection advantages of the thin and light can body can be further pursued.

Here, the secondary vibration suppressing means will be described.
As described above, the secondary vibration suppression means refers to means for suppressing the occurrence of vibrations in portions other than the percussion vibration portion of the can body that are generated when an electromagnetic shock is applied. The purpose of providing the secondary vibration suppression means is to prevent the “beat” from occurring in the tapping signal waveform.
The “beat” (resonance phenomenon) is a phenomenon in which a secondary vibration having a frequency close to that of the primary vibration is superposed to disturb the primary vibration. In the percussion vibration, the primary vibration generation source is a can vibration detection portion (for example, the bottom of the can) excited by an electromagnetic pulse, and the secondary vibration generation source is a can vibration detection portion. It is a part other than.
And it is clear from the result of the inventor's long-term research that the secondary vibration is a vibration generated due to an impact received when a can body that has jumped up due to an electromagnetic shock has landed. became.

As a result of the elucidation of the generation mechanism of “beat” in tapping vibration, it was possible to create a decisive and effective measure to suppress “beat”.
In other words, the countermeasure is to suppress the secondary vibration that causes the “beat”, but as specific means, (1) to prevent the can body from jumping up when receiving an electromagnetic shock. It was found that means and (2) means for suppressing the impact received when the jumped can body landed were effective.
The invention described below can be positioned as a further embodiment of (1) and (2).

In the inspection apparatus according to the present invention, the secondary vibration suppression means includes jumping suppression means for suppressing the jumping of the can body when an electromagnetic shock is applied.
If the percussion inspection device has such a configuration, it is possible to prevent the can body that has received an electromagnetic shock from jumping up. For this reason, generation | occurrence | production of the "beat" in percussion vibration can be suppressed, and the precision of the quality determination of a can body by percussion method can be improved.

Further, the hitting device of the present invention is configured such that the jumping-in suppression means includes a fixing means for fixing the can body at a predetermined position and suppressing the jumping-up.
If the percussion device has such a configuration, the can body itself is fixed by the fixing means, so that the jumping up can be prevented. For this reason, generation | occurrence | production of a "beat" can be suppressed and the inspection performance in a percussion inspection apparatus can be improved.

Further, the punching inspection device of the present invention is configured such that the jumping suppression means includes a vacuum suction means for sucking and fixing the can body by sucking the gas on the lid portion side of the can body and suppressing the jumping.
When the percussion inspection device has such a configuration, the can body is attracted by the vacuum suction means, so that it can be prevented from jumping up even when subjected to electromagnetic shock. For this reason, generation | occurrence | production of a "beat" can be suppressed and the quality determination of the can internal pressure test | inspection of a can can be performed exactly.

Further, the punching inspection device of the present invention is configured such that the jumping-in preventing means includes a magnetic field generating means for attracting and fixing the can body by a magnetic force and suppressing jumping up.
When the percussion inspection device has such a configuration, the can body can be attracted by a magnetic force to prevent the jumping. For this reason, generation | occurrence | production of a "beat" can be suppressed and the precision of the quality determination of canned goods in a percussion inspection apparatus can be improved.
The magnetic field generating means includes a magnet and an electromagnet.

Further, the punching inspection device of the present invention is configured such that the jumping-in suppressing means includes an attaching means for fixing the can body to a predetermined location by adhesion or adhesion and suppressing jumping up.
If the percussion inspection apparatus has such a configuration, the can body is attached to a predetermined location and cannot jump up. For this reason, it is possible to prevent the “beat” from occurring and improve the inspection performance of the percussion inspection device.

Further, in the inspection device of the present invention, the jumping-in preventing means includes a supporting means for pressing one or more of the body part, the lid part, and the bottom part of the can body to fix the can body and to restrain the jumping up. As a configuration.
If the percussion inspection device has such a configuration, the can body is pressed and fixed by the support means, and therefore the can body can be prevented from jumping up. Thereby, it is possible to perform the internal pressure inspection of the percussion device with high accuracy while suppressing the occurrence of “beat”.

Further, in the inspection apparatus of the present invention, the jumping-in preventing means is engaged with the concave portion and / or the convex portion at the trunk portion, the lid portion, and the bottom portion of the can body, thereby fixing the can body and restraining the jumping up. The structure includes a stopping means.
If the percussion inspection device has such a configuration, the locking means is locked, so that the can body cannot jump up even if it receives an electromagnetic shock. As a result, the “beat” is not included in the waveform obtained by converting the tap sound from the can body, and a defective can can be detected with high accuracy.

Further, the hitting device of the present invention is configured such that the jumping-in preventing means includes jumping-up preventing means that is provided at a position in contact with the bottom-side grounding portion of the can body and suppresses jumping up.
When the percussion inspection device has such a configuration, jumping prevention means is provided in the direction in which the can body jumps, and further, since the jumping prevention means is provided in contact with the bottom side grounding portion of the can body, the can body is If you try to jump up, you will not be able to jump up. For this reason, the “beat” generated in the taping waveform can be greatly reduced, and the inspection accuracy of the taping device can be increased.

In the inspection device according to the present invention, the secondary vibration suppressing means includes an impact suppressing means for suppressing an impact received when the can body that has jumped up by applying an electromagnetic shock is landed.
If the percussion inspection device has such a configuration, it is possible to suppress an impact when the jumped can body lands. For this reason, generation | occurrence | production of the "beat" in percussion vibration can be suppressed, and the inspection performance by percussion can be improved greatly.

In the inspection device of the present invention, the impact suppressing means includes an impact absorbing means provided at a position where the can body lands.
If the percussion inspection device has such a configuration, the impact absorbing means can absorb the impact when the jumped can body lands. For this reason, the “beat” generated in the tap waveform can be reduced, and the test performance of the tap test can be improved.

  In addition, the percussion device of the present invention includes a percussion head that applies electromagnetic shock to the can body, receives a percussion sound emitted from a percussion vibration unit of the can body, converts the sound into a percussion signal, and outputs the percussion signal. A tapping device comprising an arithmetic unit for analyzing the signal and detecting the can internal pressure of the can body, wherein the can body is struck when an electromagnetic shock is applied to the can body contained in the storage means. A secondary vibration suppression means for suppressing the occurrence of vibrations in portions other than the vibration detection unit is provided.

  When the percussion inspection device has such a configuration, it is possible to suppress the jump when the electromagnetic shock is applied to the can housed in the storage means. For this reason, the “beat” does not occur in the waveform of the tapping sound from the can stored in the storage means, and the tapping test performance can be improved.

Further, the percussion inspection device of the present invention includes a jumping suppression unit that suppresses the jumping of the can body that occurs when the secondary vibration suppression unit applies an electromagnetic shock to the can body housed in the storage unit. It is as.
When the percussion inspection device has such a configuration, it is possible to suppress jumping when an electromagnetic shock is applied to the can housed in the storage means. As a result, it is possible to suppress the occurrence of “beat” in the taping waveform and improve the accuracy of canned quality determination by the taping device.

In the inspection device according to the present invention, the jumping-in suppression means includes a fixing means for fixing the can body accommodated in the storage means at a predetermined position to prevent the jumping-up.
When the percussion inspection device has such a configuration, the can body housed in the storage means is fixed by the fixing means, and therefore, the jumping up can be suppressed. As a result, “beat” does not occur in the tap waveform, and the accuracy of determining a defective can can be increased.

Further, in the inspection apparatus according to the present invention, the jumping-in suppression means includes a vacuum suction means for sucking and fixing the can body by sucking the gas on the lid side of the can body housed in the storage means and suppressing the jumping-up. It is as.
If the percussion apparatus has such a configuration, the can body accommodated in the storage means is attracted and fixed by the vacuum suction means, so that the jump can be suppressed. For this reason, it is possible to suppress the occurrence of “growing” and improve the inspection performance of the percussion test.

Further, in the inspection device of the present invention, the jumping-in preventing means includes a magnetic field generating means for attracting and fixing the can body housed in the storing means by magnetic force to suppress the jumping-up.
When the percussion inspection device has such a configuration, the can body accommodated in the storage means cannot be jumped by being attracted by the attractive force of the magnetic field generated from the magnetic field generation means. For this reason, the percussion detecting device can detect and reject the defective can reliably and with high reliability based on the detection waveform in which no “beat” has occurred.

Further, the punching inspection device of the present invention is configured such that the jumping-in preventing means includes an attaching means for fixing the can body housed in the storing means to a predetermined location by adhesion or adhesion, and suppressing the jumping up.
If the percussion apparatus has such a configuration, the can body housed in the housing means is fixed by adhesion or adhesion, and therefore, the jumping up can be prevented. For this reason, it is possible to improve the inspection performance of the percussion device by preventing the occurrence of “beat”.

Further, in the inspection device of the present invention, the jumping-in preventing means includes a supporting means for pressing the storage means in which the can body is stored to fix the can body to suppress the jumping-up.
When the percussion inspection device has such a configuration, the storage means itself is pressed from one or more places by the support means, so that the can body accommodated in the storage means is subjected to electromagnetic shock. Can't jump up. As a result, “beat” does not occur in the punching waveform, and a good can and a defective can can be accurately selected.

Further, in the inspection apparatus of the present invention, the jumping-in preventing means is engaged with the concave portion and / or the convex portion at the trunk portion, the lid portion, and the bottom portion of the can body, thereby fixing the can body and restraining the jumping up. The structure includes a stopping means.
If the percussion inspection device has such a configuration, the locking means is locked to the concave portion or the convex portion, so that the can body contained in the storage means can be prevented from jumping up. For this reason, it is possible to improve the inspection performance of percussion by suppressing “growing”.

Further, the hitting device of the present invention is configured such that the jumping-in preventing means is provided in contact with the upper surface of the storage means in which the can body is housed, and includes the jumping-up preventing means for suppressing the jumping up.
When the percussion inspection device has such a configuration, even if the can body accommodated in the storage means is about to jump up, the jump-off prevention means cannot get in the way and jump up. Thereby, “beat” is suppressed, and the inspection performance of the percussion device can be improved.

In the inspection device of the present invention, the secondary vibration suppression unit includes an impact suppression unit that suppresses an impact received when the can body housed in the storage unit receives an electromagnetic impact and jumps and landing. .
If the percussion inspection device has such a configuration, it is possible to mitigate / suppress the impact when the jumped can body lands on the can body stored in the storage means. For this reason, it is possible to improve the inspection performance of the percussion inspection device by reducing the “beat” in the percussion vibration.

In the inspection device according to the present invention, the impact suppressing means includes an impact absorbing means provided at a position where the can body lands on the inner bottom surface of the storage means.
If the percussion inspection device has such a configuration, it is possible to reduce the impact when the can body accommodated in the storage means jumps up and lands. For this reason, it is possible to reduce the “beat” generated in the percussion waveform and to improve the accuracy of canned quality determination.

  Further, the percussion inspection method of the present invention includes an impact applying step for applying an electromagnetic shock to the can body, and suppressing occurrence of vibrations in portions other than the percussion vibration portion of the can body when the electromagnetic shock is applied. A tapping sound receiving step for receiving tapping sound generated from a tapping vibration portion of the can body, an analysis step for analyzing a tapping signal converted from the tapping sound, and a can based on the analysis result of the tapping signal And a can internal pressure detecting step for detecting a can internal pressure of the body.

  When the percussion inspection method is such a method, the jump of the can subjected to the electromagnetic shock is suppressed by the jump suppression means. For this reason, the “beat” is eliminated, and the inspection performance of the percussion can be improved.

As described above, according to the present invention, since the percussion inspection device is provided with the secondary vibration suppression means, the occurrence of vibrations in portions other than the percussion vibration portion of the can subjected to electromagnetic shock is suppressed. it can. For this reason, it is possible to suppress the “beat” generated in the percussion signal waveform, and to dramatically improve the inspection performance by the percussion method.
Accordingly, the inspection performance of the thin and light can body can be improved, and the safety of the can body can be improved. At the same time, the economical and environmental protection advantages of the thin and light can body can be further pursued.

  Hereinafter, preferred embodiments of a percussion apparatus and percussion method according to the present invention will be described with reference to the drawings.

[Percussion device]
First, an embodiment of the percussion inspection apparatus of the present invention will be described with reference to FIG.
FIG. 2 is a schematic configuration diagram showing the configuration of the percussion inspection apparatus according to the present embodiment.
As shown in the figure, the inspection apparatus 1 includes an inspection head 10, an arithmetic unit 20, a mounting means 30, a secondary vibration suppressing means 40 (shown in FIG. 2 and subsequent figures), and a defective can removing means 50. And.

The percussion head 10 receives the percussion sound generated by the electromagnetic coil 11 for applying electromagnetic shock to the disc portion (lid portion, bottom portion) of the can C and the electrical signal (percussion). A microphone 12 that is converted into a detection signal and sent to the arithmetic unit 20.
The arithmetic unit 20 includes a frequency analysis unit 21 that performs frequency analysis on the tapping signal from the microphone 12 and a pass / fail determination unit 22 that determines whether the canned product is good based on the analysis result of the frequency analysis unit 21. .
The placing means 30 is a means on which the can body C to be inspected is placed. The placement means 30 includes, for example, a conveyance plate included in a belt conveyor.

The secondary vibration suppression means 40 is a means for suppressing the can C from jumping up when subjected to electromagnetic shock.
Details of the secondary vibration suppressing means 40 will be described in [Secondary vibration suppressing means] described later.

  The defective can removing means 50 is means for removing the can body that is determined to be defective by the pass / fail determination unit 22 of the arithmetic unit 20. Specific examples of the rejection mechanism (reject) include, for example, a mechanism that pushes with a pin or a guide, and a mechanism that blows away with a jet (air).

[Secondary vibration suppression means]
Next, the secondary vibration suppressing means provided in the percussion inspection apparatus of the present embodiment will be described with reference to FIGS. 2 to 18 are configuration diagrams respectively showing specific examples of the secondary vibration suppressing means.
Specific examples of the secondary vibration suppression means 40 include the following.
<A> When the can body C is a single body (A1) Can body fixing means (A2) Jump prevention means (A3) Shock absorbing means (A4) Liquid body <B> When the can body C is stored in the storage means ( B1) Can body fixing means (B2) Jumping prevention means (B3) Shock absorbing means

Among these, (A1) can body fixing means, (A2) jumping prevention means, (B1) can body fixing means, and (B2) jumping prevention means mainly prevent the can body that has been subjected to electromagnetic shock from jumping up. As a means for this, it is generally referred to as “jump prevention means”.
The (A3) impact absorbing means and the (B3) impact absorbing means are means for suppressing / relaxing the impact received when the jumped can body lands, and are referred to as “impact suppressing means”.
Note that (A4) liquid material has both functions and effects as “jumping suppression means” and “impact suppression means” and can be classified into both.
Hereinafter, each specific example of the secondary vibration suppressing means will be sequentially described below.

<A: When can body C is a single body>
(A1: Can body fixing means)
The can body fixing means (fixing means) A1 is means for fixing the can body C itself at a predetermined position to suppress jumping.
Specific examples of the can fixing means A1 include the following.
(A11) Attraction means (A12) Magnetic field generation means (A13) Adhesion means (A14) Support means (A15) Locking means

(A11: suction means)
The suction means 41a is a means for attracting and fixing the can body C at a predetermined position by sucking the gas on the lid side of the can body C and suppressing the jumping.
As a specific example of the suction means 41a, for example, a vacuum suction means can be used.
As shown in FIG. 2, the vacuum suction means includes a vacuum pump 41 a-1 for sucking the gas between the placement means 30 and the can body C, and the vacuum pump 41 a-1 and the suction port 31 (placement). And a suction pipe 41a-2 for connecting a hole formed directly under the can body C in the means 30.

  When the vacuum pump 41a-1 is activated, the gas between the mounting means 30 and the can body C is sucked into the vacuum pump 41a-1 through the suction port 31 and the suction pipe 41a-2. Thereby, since the density of the gas between the mounting means 30 and the can body C extremely decreases, the can body C is attracted toward the mounting means 30. Therefore, the can body C cannot jump up even if it receives an electromagnetic shock.

The can body C includes a three-piece can (lid portion, body portion, bottom portion), a two-piece can (lid portion, bottomed body portion), a bottle can (bottle body, cap portion), and the like.
For example, when the can body C is a three-piece can or a two-piece can, the joint portion between the lid portion and the body portion, that is, the peripheral portion of the lid portion is slightly raised from the center portion of the lid portion and then wound outward. Yes. For this reason, as shown in FIG. 2, when the can C is inverted with the lid portion on the placement means 30, the peripheral rising portion (lid side grounding portion) of the lid portion contacts the placement means 30. There is a space between the center portion of the lid and the placing means 30. The vacuum pump 41a-1 sucks the gas existing in the space, makes the space vacuum, and attracts the can body C.

  On the other hand, when the can body C is a bottle can, as shown in FIG. 3, the top surface of the cap portion contacts the mounting means 30. The top surface of this cap part is formed in a substantially flat surface, and the suction port 31 is closed by the top surface. For this reason, a space as in the case of a three-piece can or the like cannot be formed between the placing means 30 and the can body C, and the vacuum pump 41a-1 is a gas in the suction port 31 and the suction pipe 41a-2. The can body C (bottle can) is attracted by vacuuming the vacuum.

However, the top surface of the cap part is not a perfect plane, and there are some differences in elevation (bumps in the central part, dents in the peripheral part, unevenness due to design, damage, etc.). For this reason, the suction port 31 cannot be completely closed by the top surface, and a slight gap is formed. In this case, the vacuum pump 41a-1 sucks the gas around the bottle body through the gap.
When the vacuum pump 41a-1 sucks the gas around the bottle body, the suction port 31 is completely blocked by the top of the cap, and the vacuum pump 41a-1 is placed inside the suction port 31 and the suction tube 41a-2. Compared with the case of sucking only gas, the former has lower suction efficiency, the load on the vacuum pump 41a-1 is larger, and the force for attracting the can body C is also weaker.

Therefore, as shown in FIG. 4, a holder 32 projecting from the mounting means 30 can be provided so as to surround all or part of the can body C.
The holder 32 is provided at a position where the can body C is placed on the placing means 30. The holder 32 can be formed mainly of, for example, a hexahedron (such as a cube or a rectangular parallelepiped), and has a through hole 32-3 penetrating from the upper surface 32-1 to the lower surface 32-2, and the through hole 32-3. The lower end of this leads to the suction port 31. Further, the inner surface of the through hole 32-3 is formed in accordance with the surface shape of the can body C in a state of being placed on the placing means 30.

When the can body C is fitted (set) into the through hole 32-3 of the holder 32 and the top surface of the cap portion of the can body C comes into contact with the suction port 31 of the mounting means 30, the holder 32 The inner surface of the through hole 32-3 comes into contact with the surface of the can body C (or a very small gap is formed by being very close to each other).
When the vacuum pump 41a-1 is operated in this state, the range where the vacuum state is reached exceeds the inside of the suction port 31 and the top surface of the cap portion in contact with the space, and is sandwiched between the holder 32 and the can body C. It reaches to. For this reason, compared with the case where only the suction port 31 is evacuated, the force for attracting the can body C can be increased, and the can body C can be stably fixed. Moreover, the suction efficiency of the vacuum pump 41a-1 can be increased and the load can be reduced.
In addition, although the holder 32 is formed so that a part of can body C may be surrounded, the one where the surrounding range is wide is desirable.

(A12: Magnetic field generating means)
The magnetic field generation unit 42a is a unit that generates a magnetic field around the magnetic field generation unit, attracts the can body C by the magnetic force (for example, magnetic attraction), and fixes the can body C at a predetermined position, thereby suppressing the jump. This is particularly effective when the can body C is formed of a magnetic material such as steel.
As a specific example of the magnetic field generating means 42a, for example, a magnet (magnet belt, magnet guide), an electromagnet, or the like can be used.

As shown in FIG. 5, the magnetic field generation means 42a can be attached to the upper surface of the mounting means 30, for example (magnetic field generation means 42a-1). Moreover, it can also attach to the lower surface of the mounting means 30 (magnetic field generation means 42a-2). Furthermore, it can also be provided at a position spaced further downward from the lower surface of the mounting means 30 (magnetic field generating means 42a-3). And it can also provide in the vicinity (position which touches the side surface of the can body C, the position slightly separated from the can body C) of the can body C (magnetic field generation means 42a-4). Further, the placing means 30 itself can be used as a magnetic field generating means.
In addition, the magnetic field generation means 42a can also be provided in the position which touches the bottom face and bottom side grounding part of the can C. However, care must be taken not to adversely affect electromagnetic shock.

(A13: Adhering means)
The adhering means 43a is a means for fixing the can body C to the mounting means 30 or the like by adhesion or adhesion, and suppressing the jumping.
Specific examples of the attaching means 43a include an adhesive, a pressure-sensitive adhesive, an adhesive member (for example, an adhesive sheet), an adhesive member (for example, an adhesive sheet), and the like.
Since the attaching means 43a adheres or adheres the can body C to the mounting means 30 or the like, for example, as shown in FIG. 6, the attaching means 43a is provided at a portion where the can body C on the mounting means 30 contacts ( Alternatively, it is applied).

(A14: Support means)
The support means 44a is means for suppressing the jumping by pressing and fixing the entire body portion, lid portion or bottom portion of the can body C or a predetermined portion from the side or the like.
As a specific example of the support means 44a, for example, as shown in FIG. 7, a member (support means 44a-1) for pressing the body portion of the can body C from a plurality of locations, or a member (support for pressing the lid portion from the side). Means 44a-2) or the like can be used. The place which the support means 44a supports can be one place or two places or more.
Moreover, the support means 44a can also be comprised with a belt and a fixed guide.

(A15: Locking means)
The locking means 45a is a means for catching and locking the concave portion or the convex portion of the can body C, thereby fixing the can body C and suppressing the jumping.
A recessed part and / or a convex part say the part depressed or protruded rather than these parts in the trunk | drum, the cover part, or the bottom part of the can C. The concave portion and / or the convex portion include, for example, a tightening portion, a concave portion between the tightening portion and the trunk portion, a depression formed in the trunk portion, or a screw portion of a cap in the bottle-type can body. .

As shown in FIG. 8, the can body C has a tightening portion at a joint portion between the lid portion and the body portion. The tightening portion is formed in an annular shape, and a recess is formed in an annular shape between the tightening portion and the body portion.
On the other hand, the locking means 45a is formed in a projecting manner on the mounting means 30 in an annular shape, and a locking part is formed in a hook shape inwardly above the protruding part. The inner diameter of the locking means 45a is substantially the same as the outer diameter of the tightening portion of the can body C, but is slightly longer.

  The can body C is placed and fitted in an inverted manner so that the lid portion is at the position where the locking means 45a is formed. Then, the lid-side grounding portion, which is the top of the tightening portion, comes into contact with the mounting means 30, and the locking portion of the locking means 45a is hooked and locked in the recess between the winding tightening portion and the trunk portion. The body C is fixed.

In the present embodiment, the locking means 45a is formed in an annular shape, but is not limited to an annular shape, for example, so as to be locked at a plurality of concave portions between the tightening portion and the trunk portion. A plurality of short widths can be provided.
Furthermore, the latching means 45a has elasticity so that the can body C can be fitted outside. Further, the locking means 45a does not release the locking to the can body C against the force that the can body C that has received an electromagnetic shock tries to jump up. It has enough elasticity to release its lock when pulled up.
In FIG. 8, the locking means 45a and the mounting means 30 are integrally formed. However, the locking means 45a and the mounting means 30 are not limited to being integrally formed, and are formed separately. You can also

  Up to this point, the can body fixing means A1 has been described. As the secondary vibration suppressing means provided for the can body C itself, in addition to the can body fixing means (A1), for example, jump prevention means (A2), There are impact absorbing means (A3) and liquid (A4).

(A2: Jump-up prevention means)
As shown in FIG. 9, the jumping prevention means 46 a is provided at a position in contact with the bottom side grounding portion of the can body C.
The position where the jump prevention means 46a is provided is located in the direction in which the can body C is about to jump up. Moreover, in the can body C, the lid side grounding portion is in contact with the mounting means 30. That is, the can body C is sandwiched between the placing means 30 and the jumping prevention means 46a so that it cannot move in the vertical direction. Thus, since the can C is pressed from above and below, it cannot jump up even if it receives an electromagnetic shock.

(A3: Shock absorbing means)
As shown in FIG. 10, the shock absorbing means (buffer means) 47a is provided on the ground of the can body C (for example, on the mounting means 30), and reduces the impact when the jumped can body C lands. Suppress. Thereby, it can suppress that the extra vibration generate | occur | produces in the can body C by the impact at the time of the landing.
The impact absorbing means 47a can be made of a material having a high impact absorption rate, such as non-brene (Hirakata Giken Co., Ltd.), alpha gel (Geltec Co., Ltd., registered trademark), or the like.

(A4: Liquid)
As the secondary vibration suppressing means, for example, the liquid material 48a can be used.
The liquid material 48a refers to a material whose liquid state is liquid. Moreover, the liquid containing the material for raising a viscosity can be included.
As shown in FIG. 11, a part of the can body C is immersed in the liquid material 48a. For this reason, the jump of the can body C can be suppressed by the viscosity of the liquid 48a. Further, the impact when the jumped can body C lands can be reduced.

<B: When the can C is stored in the storage means>
In the above-mentioned <A: When the can body C is a single body>, when the can body C exists as a single body, when the can body C receives an electromagnetic shock, vibrations of portions other than the percussion vibration section are generated. The secondary vibration suppressing means provided for suppressing the occurrence has been described.
Here, when the can body C is housed in the housing means 60, the can body C is provided to suppress the occurrence of vibrations in portions other than the percussion vibration section when the can body C receives an electromagnetic shock. Next vibration suppression means will be described.
The storage means 60 refers to cases that can store one or more cans C.

  As the secondary vibration suppression means provided for the can body C stored in the storage means 60, as described above, the can body fixing means (B1), the jump prevention means (B2), and the impact absorbing means (B3). is there.

(B1: Can body fixing means)
The can body fixing means (fixing means) B1 is a means for restraining jumping by fixing the can body C stored in the storage means 60 at a predetermined position.
Specific examples of the can fixing means B1 include the following.
(B11) Attraction means (B12) Magnetic field generation means (B13) Adhesion means (B14) Support means (B15) Locking means

(B11: suction means)
The suction unit 41b is a unit that attracts the can body C by suctioning the gas on the lid portion side of the can body C stored in the storage unit 60 and fixes the can body C at a predetermined position to suppress the jumping.
As a specific example of the suction means 41b, for example, a vacuum suction means can be used.
As shown in FIG. 12, the vacuum suction means includes a vacuum pump 41b-1 for sucking gas between the inner bottom surface of the storage means 60 and the can body C, and the vacuum pump 41b-1 and the suction port 31 ( The mounting means 30 has a suction pipe 41b-2 for connecting the holes C) directly below the can bodies C housed in the housing means 60.

Further, at the bottom of the storage means 60, suction openings 61 are provided directly below the can bodies C stored in the storage means 60. The suction opening 61 communicates with the suction port 31 of the mounting means 30. For this reason, the vacuum pump 41b-1 sucks the gas existing between the bottom portion of the storage means 60 and the can body C through the suction opening 61, the suction port 31, and the suction pipe 41b-2 so as to be in a vacuum state. To.
Note that the bottom surface of the storage means 60 can be formed of a breathable material instead of providing the suction opening 61.
Examples of the air permeable material include paper, cloth, nonwoven fabric, porous material, punching metal, perforated sheet, mesh sheet, wire mesh, or a composite thereof.

Moreover, in FIG. 12, although it is set as the structure which provided one vacuum pump 41b-1 with respect to the several can body C, the vacuum pump 41b-1 is not restricted to one unit, It can also provide multiple units | sets. .
Furthermore, when the can body C is a bottle can, a holder 32 as shown in FIG.

(B12: Magnetic field generating means)
The magnetic field generating means 42b generates a magnetic field around the magnetic field generating means, and by this magnetic force (for example, magnetic attraction), the can body C accommodated in the storage means 60 is attracted and fixed at a predetermined position. It is a means to suppress jumping. This is particularly effective when the can body C is formed of a magnetic material such as steel.
As a specific example of the magnetic field generating means 42b, for example, a magnet (magnet belt or the like), an electromagnet, or the like can be used.

  As shown in FIG. 13, the magnetic field generation means 42b can be attached to the upper surface (magnetic field generation means 42b-1) and lower surface (magnetic field generation means 42b-2) of the mounting means 30, for example. It can also be provided at a position further spaced downward from the lower surface of the mounting means 30 (magnetic field generating means 42b-3). Furthermore, it can also be provided inside the storage means 60 (magnetic field generating means 42b-4). Further, the mounting means 30 itself or the storage means 60 itself can be used as the magnetic field generating means.

(B13: Adhering means)
The adhering means 43b is means for fixing the can body C to the bottom surface of the storage means 60 or the like by adhesion or adhesion, and suppressing the jumping.
Specific examples of the attaching means 43b include an adhesive, an adhesive, an adhesive member (for example, an adhesive sheet), an adhesive member (for example, an adhesive sheet), and the like.
Since the attachment means 43b adheres or adheres the can body C to the bottom surface or the like of the storage means 60, for example, as shown in FIG. 14, the attachment means 43b is provided at the contact portion of the bottom surface of the storage means 60 with which the can body C contacts. (Alternatively, it is applied).

(B14: Support means)
The support unit 44b is a unit that presses the storage unit 60 in which the can body C is stored from the outside, fixes the can body C therein, and suppresses the jumping.
As a specific example of the support means 44b, for example, a belt or a fixed guide can be used. The place supported by this support means 44b can be one place or two places or more.

(B15: Locking means)
The locking means 45b is means for hooking and locking the concave portion or the convex portion (for example, a tightening portion) of the can body C, thereby fixing the can body C and suppressing the jumping.
As shown in FIG. 16, the locking means 45 b can be formed on the bottom surface of the storage means 60, etc., and is locked by being caught by the concave portion and / or the convex portion of the can body C. Thereby, the can body C is fixed and jumping up is suppressed.
The locking means 45b can have the same shape as the locking means 45a described in (A15: Locking means).

  Up to this point, the can body fixing means B1 has been described. As the secondary vibration suppression means provided for the can body C stored in the storage means 60, in addition to the can body fixing means (B1), for example, jumping up There are blocking means (B2) and shock absorbing means (B3).

(B2: Jump-up prevention means)
As shown in FIG. 17, the jump prevention means 46 b is provided at a position in contact with the upper surface of the storage means 60 in which the can body C is stored. That is, the position where the jump prevention means 46b is provided is located in the direction in which the can body C is about to jump up. On the other hand, the lower surface of the storage means 60 is in contact with the placement means 30. For this reason, the can body C is sandwiched between the placing means 30 and the jumping prevention means 46a while being accommodated in the accommodation means 60 so that it cannot move in the vertical direction. Thus, since the can C is pressed from above and below, it cannot jump up even if it receives an electromagnetic shock.

(B3: Shock absorbing means)
As shown in FIG. 18, the shock absorbing means (buffer means) 47b is provided on the landing surface of the can body C (for example, the bottom surface of the storage means 60), and mitigates the impact when the jumping can body C lands.・ Suppress. Thereby, it can suppress that the extra vibration generate | occur | produces in the can body C by the impact at the time of the landing.

[Inspection method]
Next, the operation (percussion method) of the percussion apparatus according to the present embodiment will be described with reference to FIG.
In the percussion inspection method of the present embodiment, the can body C is a single body (not stored in the storage means 60), and the suction means 41a (vacuum suction means) is used as the secondary vibration suppression means. It is assumed that

First, the can body C is placed at a predetermined position of the placing means 30. When the can C placed on the placing means 30 by a conveyor or the like comes directly under the inspection head 10 of the inspection apparatus 1, the vacuum pump 41a-1 of the vacuum suction means that is the secondary vibration suppression means is activated. The gas between the can body C and the placing means 30 is sucked. Thereby, the can body C is attracted and fixed toward the mounting means 30.
The vacuum pump 41 a-1 can also be activated before the can body C comes directly below the inspection head 10.

An electric current flows through the electromagnetic coil 11 of the percussion head 10, and an electromagnetic shock is applied to the disk portion (lid portion, bottom portion) of the can body C (electromagnetic shock applying step, step 10).
The can C to which the electromagnetic shock is applied tries to jump up by the reaction, but cannot be jumped up because it is attracted and fixed by the vacuum suction means as the secondary vibration suppression means (flying suppression) ).

Then, a tapping sound is generated from the disc portion of the can C to which electromagnetic shock is applied, and this tapping sound is received by the microphone of the tapping head 10 (tacking sound receiving step, step 11).
The received tapping sound is converted into an electrical signal (tacking signal) by the microphone and sent to the arithmetic unit 20.

The frequency analysis unit 21 of the arithmetic unit 20 performs frequency analysis on the waveform indicated by the tapping test signal (tacking signal analysis step, step 12), and detects the can internal pressure of the can body C based on the analysis result (can Internal pressure detection step, step 13).
And the quality determination part 22 of the arithmetic unit 20 determines the quality of the can body C (canned food) based on the detected can internal pressure (quality determination step, step 14). Here, the can body C (canned food) determined to be defective is removed by the defective can removing means 50 (defective can removing step, step 15).

Here, FIG. 20 shows the waveform of the tapping signal obtained when the tapping apparatus is operated.
FIG. 6A shows the waveform of the percussion signal obtained in the percussion apparatus 1 in which the secondary vibration suppression means 40 (vacuum suction means) is not provided, and FIG. The waveform of the percussion signal obtained in the percussion apparatus 1 provided with (vacuum suction means) is shown.
As is clear from comparison of FIGS. 4A and 4B, the “beat” of the tapping signal can be suppressed by providing the secondary vibration suppression means 40 (vacuum suction means).

In the percussion method of the present embodiment, the case where the can body C exists alone has been described. However, for example, when the can body C is stored in the storage means 60, the percussion method is performed in the same procedure. Executed.
In the inspection method of the present embodiment, the vacuum suction means has been described as a representative example of the secondary vibration suppression means. For example, by using various secondary vibration suppression means such as a magnetic field generation means, an adhesion means, and a support means. Also, the same effect as the case of the vacuum suction means (an effect of suppressing the jump of the can body C) can be obtained.

The preferred embodiments of the percussion apparatus and percussion method of the present invention have been described above, but the percussion apparatus and percussion method according to the present invention are not limited to the above-described embodiments, and the scope of the present invention. Needless to say, various modifications can be made.
For example, in the above-described embodiment, various aspects of the secondary vibration suppression unit have been described, but these aspects are not only used when only one is selected and used, but a plurality of aspects are used in combination. Can do.

In addition to the various aspects of the secondary vibration suppression means described above, for example, a means for fixing the can body C with a suction cup can be used.
Furthermore, in each description of the various aspects of the secondary vibration suppression means, the case where it is mainly applied to a two-piece can or a three-piece can has been described, but the can body to which the secondary vibration suppression means is applied is a two-piece can or For example, a bottle can is also included.

  Since the present invention is an invention aimed at eliminating the “beat” generated in the percussion detection signal, it can be used for an apparatus or a device that performs percussion inspection.

It is a schematic block diagram which shows the structure of the percussion inspection apparatus of this invention. It is a schematic block diagram which shows the structure of a vacuum suction means and a can body periphery. It is a schematic block diagram which shows the structure of a vacuum suction means and can body periphery when a can body is a bottle can. It is a schematic block diagram which shows the structure of the vacuum suction means and can body periphery when a holder is provided in the mounting means. It is a schematic block diagram which shows the structure of a magnetic field generation | occurrence | production means and can body periphery. It is a schematic block diagram which shows the structure of an adhesion | attachment means and a can body periphery. It is a schematic block diagram which shows the structure around a support means and a can body. It is a schematic block diagram which shows the structure of a latching means and a can body periphery. It is a schematic block diagram which shows the structure of a jump prevention means and a can body periphery. It is a schematic block diagram which shows the structure around an impact-absorbing means and a can body. It is a schematic block diagram which shows the structure of a liquid body and a can body periphery. It is a schematic block diagram which shows the structure of a vacuum suction means and a can body periphery when a some can body is accommodated in the storage means. It is a schematic block diagram which shows the structure of a magnetic field generation | occurrence | production means when a some can body is accommodated in the accommodation means, and a can body periphery. It is a schematic block diagram which shows the structure of the adhesion | attachment means and can body at the time of a some can body being accommodated in the storage means. It is a schematic block diagram which shows the structure of a support means and can body periphery when a some can body is accommodated in the storage means. It is a schematic block diagram which shows the structure of the latching means and can body periphery when a several can body is accommodated in the storage means. It is a schematic block diagram which shows the structure of a jump prevention means when a several can body is accommodated in the storage means, and a can body periphery. It is a schematic block diagram which shows the structure of an impact-absorbing means and can body periphery when a some can body is accommodated in the storage means. It is a flowchart which shows the operation | movement procedure of the percussion inspection method of this invention. FIG. 6 is a waveform diagram of a tapping signal, where (a) is a waveform of a tapping signal measured by a tapping device not provided with secondary vibration suppression means, and (b) is provided with secondary vibration suppression means. It is a wave form diagram which shows the waveform of the tapping signal measured with the tapping apparatus currently used, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Percussion apparatus 10 Percussion head 20 Arithmetic apparatus 30 Placement means 31 Suction port 32 Holder 32-1 Upper surface 32-2 Lower surface 32-3 Through-hole 40 Secondary vibration suppression means 41a, 41b Suction means (vacuum suction means)
41a-1, 41b-1 Vacuum pumps 41a-2, 41b-2 Suction tubes 42a, 42b Magnetic field generating means 43a, 43b Adhering means 44a, 44b Support means 45a, 45b Locking means 46a, 46b Jumping prevention means 47a, 47b Impact Absorbing means 48a Liquid 50 Defective can removing means 60 Storage means 61 Suction opening

Claims (23)

A tapping head that applies electromagnetic shock to the can body and receives a tapping sound emitted from a tactile vibration portion of the can body and converts it into a tapping signal, and analyzes the tapping signal to analyze the can body A tapping tester equipped with an arithmetic device for detecting the internal pressure of the can,
2. A percussion inspection device comprising secondary vibration suppression means for suppressing the occurrence of vibrations in portions other than the percussion vibration portion of the can that are generated when the electromagnetic shock is applied. The secondary vibration suppression means is
The punching inspection device according to claim 1, further comprising jumping suppression means for suppressing jumping of the can body when the electromagnetic shock is applied. The jump suppression means is
The percussion inspection device according to claim 2, further comprising fixing means for fixing the can body at a predetermined position and suppressing the jumping. The jump suppression means is
4. The percussion inspection device according to claim 2, further comprising vacuum suction means for sucking and fixing the can body by sucking a gas on a lid side of the can body and suppressing the jumping. The jump suppression means is
The percussion inspection device according to any one of claims 2 to 4, further comprising magnetic field generation means for attracting and fixing the can body by a magnetic force and suppressing the jumping. The jump suppression means is
The percussion inspection device according to any one of claims 2 to 5, further comprising attachment means for fixing the can body to a predetermined location by adhesion or adhesion and suppressing the jumping. The jump suppression means is
The support body which presses down one or two or more among the trunk | drum, the cover part, and the bottom part of the said can body, fixes the said can body, and suppresses the said jumping up. Any one of Claims 2-6 characterized by the above-mentioned. The percussion inspection device according to the above. The jump suppression means is
3. A locking means for locking the body of the can body to the concave portion and / or the convex portion at the bottom portion, and / or the bottom portion, thereby fixing the can body and suppressing the jumping. The percussion inspection device according to any one of? The jump suppression means is
The punching inspection device according to any one of claims 2 to 8, further comprising jump prevention means provided at a position in contact with a bottom-side grounding portion of the can body to suppress the jump. The secondary vibration suppression means is
The percussion inspection device according to claim 1, further comprising impact suppression means that suppresses an impact received when the can body that has jumped up due to the electromagnetic impact is landed. The impact suppression means is
The percussion inspection device according to claim 10, further comprising impact absorbing means provided at a position where the can body lands. A tapping head that applies electromagnetic shock to the can body and receives a tapping sound emitted from a tactile vibration portion of the can body and converts it into a tapping signal, and analyzes the tapping signal to analyze the can body A tapping tester equipped with an arithmetic device for detecting the internal pressure of the can,
Secondary vibration suppression means for suppressing the occurrence of vibrations in portions other than the percussion vibration portion of the can body that are generated when the electromagnetic shock is applied to the can body housed in the storage means. An inspection device characterized by the following. The secondary vibration suppression means is
The punching inspection device according to claim 12, further comprising jumping suppression means for suppressing jumping of the can body that occurs when the electromagnetic shock is applied to the can body stored in the storage means. The jump suppression means is
The percussion inspection apparatus according to claim 13, further comprising: a fixing unit that fixes the can body stored in the storage unit at a predetermined position to suppress the jumping. The jump suppression means is
The vacuum suction means which attracts and fixes the said can body by attracting | sucking the gas by the side of the cover part of the said can body accommodated in the said accommodating means, and suppresses the said jumping is included. Percussion device. The jump suppression means is
The percussion inspection device according to any one of claims 13 to 15, further comprising a magnetic field generation unit that attracts and fixes the can body stored in the storage unit by a magnetic force to suppress the jumping. The jump suppression means is
The percussion inspection device according to any one of claims 13 to 16, further comprising an attaching means for fixing the can body housed in the housing means to a predetermined location by adhesion or adhesion, and suppressing the jumping. . The jump suppression means is
18. The percussion device according to claim 13, further comprising a supporting unit that presses down the storage unit in which the can body is stored to fix the can body and suppress the jumping. The jump suppression means is
14. A locking means for locking the body, the lid, and the concave portion and / or the convex portion at the bottom of the can body, thereby fixing the can body and suppressing the jumping. The inspection device according to any one of -18. The jump suppression means is
The punching inspection device according to any one of claims 13 to 19, further comprising a jumping-up preventing unit that is provided in contact with an upper surface of the storing unit in which the can body is stored and suppresses the jumping-up. The secondary vibration suppression means is
The percussion inspection device according to claim 12, further comprising impact suppression means for suppressing an impact received when the can housed in the storage means jumps and landing upon receiving the electromagnetic impact. The impact suppression means is
The percussion inspection device according to claim 21, further comprising impact absorbing means provided at a position where the can body lands on the inner bottom surface of the storage means. An impact applying step for applying electromagnetic shock to the can body;
Tapping sound reception for receiving tapping sound emitted from the tactile vibration part of the can body while suppressing the occurrence of vibrations in parts other than the tactile vibration part of the can body when the electromagnetic shock is applied Steps,
An analysis step of analyzing a tapping signal converted from the tapping sound;
And a can internal pressure detecting step of detecting a can internal pressure of the can body based on an analysis result of the inspection signal.

Images