JP2016090365A - Hammer impact test device and hammer impact test method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a simple configuration to prevent a first oscillation generated by giving an electromagnetic impact from propagating to a can body.SOLUTION: A hammer impact test device 1 comprising: a hammer impact head 10 that gives a can body C an electromagnetic impact, receives a hammer impact sound to be emitted from a hammer impact oscillation part of the can body C, converts the hammer impact sound to a hammer impact signal, and outputs the hammer impact signal; and a computation device 20 that analyzes the hammer impact signal and discriminates a can inner pressure of the can body C, the hammer impact test device comprises first oscillation suppression means 40 that prevents a first oscillation generating in a can lid C3 of the can body C when the electromagnetic impact is given.SELECTED DRAWING: Figure 1

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, determines a can internal pressure, In particular, the present invention relates to a percussion apparatus and a percussion method that improve the detection accuracy of defective cans by suppressing the generation of resonance noise in portions other than the percussion vibration portion in the can body. .

Conventionally, the percussion method has been widely adopted as a method for nondestructively inspecting the internal pressure of cans such as cans filled with sealed containers, particularly foods and beverages that are susceptible to corruption.
In the percussion method, a reverberation vibration sound (percussion test) generated by applying an electromagnetic shock to a predetermined part of the can body, for example, the bottom of the can body located at the top of the can body is used as a percussion vibration section. Sound) is detected by a microphone, the frequency of this reverberation vibration sound is measured, the internal pressure of the can is discriminated from the correlation between the internal pressure of the can previously grasped and the measured frequency, and an inspection method for judging the quality of the can body is there.

  Here, when the relationship between the frequency of the reverberation vibration sound detected by the microphone and the sound level is graphed (see FIG. 22), in a non-defective can body, the peak value of the protruding sound level is obtained at a certain frequency. As shown. This peak value is the natural vibration of the can body, and the quality of the can body can be determined by determining whether or not the frequency at which the peak value appears is in the frequency band corresponding to the appropriate can internal pressure.

However, when the reverberation vibration sound is actually analyzed for a good can body and the relationship between the frequency of the reverberation vibration sound and the sound level is graphed (see FIG. 24), peak values may appear at a plurality of frequencies. .
This is because when an electromagnetic shock is applied to the bottom of the can body, resonance occurs in the body and lid other than the bottom, and this vibration sound is detected by a microphone, so that the peak value indicating this vibration sound is a frequency. This is probably because it appears in the distribution. In particular, since the vibration form of the can tends to become more complex due to changes in the material of the body and lid of the can body and the reduction in thickness and weight in recent years, the peak value depends on the location of the vibration sound. The frequency that appears is also different.

In this way, if a plurality of peak values appear in the frequency distribution of the reverberation vibration sound, even if the frequency of the reverberation vibration sound generated at the bottom of the can is within the frequency band corresponding to the appropriate can internal pressure, Because the frequency of the resonance generated in the part other than is not in the frequency band corresponding to the appropriate internal pressure of the can, it is assumed that the can body that should be a good product is judged as a defective product. This will cause a decrease in accuracy.
In view of this, there has been proposed a technique for suppressing the resonance in the portion other than the bottom of the can and improving the accuracy of the quality determination of the can body.
For example, an internal pressure inspection apparatus including a pressing body that presses the outer peripheral edge portion of the bottom portion over the entire circumference when the bottom portion of the can body in an inverted state is forcibly excited has been proposed (see, for example, Patent Document 1). ).
According to this internal pressure inspection apparatus, since the pressing body presses the outer peripheral edge of the bottom part over the entire circumference, propagation of vibration from the can bottom to the can body is suppressed. Thereby, since the resonance in the can body is reduced, the accuracy of the quality determination of the can body can be improved.

In addition, a technique has been proposed that suppresses the occurrence of secondary vibration when the vibration that occurs when the can body jumps up and lands when it is subjected to electromagnetic shock is defined as secondary vibration (for example, Patent Documents). 2). That is, in this technique, by providing secondary vibration suppression means for applying a downward force to the can body, the can body is prevented from jumping up and landing is prevented from occurring.
As a result, the occurrence of secondary vibration accompanying landing is suppressed, and the peak value of the vibration sound resulting from the secondary vibration is not detected, so that the accuracy of the quality determination of the can can be improved.

JP 2005-170442 A JP 2006-153696 A

  However, the techniques described in Patent Documents 1 and 2 described above have the following problems.

For example, an internal pressure inspection device that is a technique described in Patent Document 1 is a device that suppresses the propagation of vibration from the bottom of the can to the can body by pressing the outer peripheral edge of the bottom of the can during the percussion. is there.
In this device, it is necessary to provide a plurality of pressing bodies in order to press the outer peripheral edge of the can bottom over the entire circumference. In addition, the plurality of pressing bodies must be arranged circumferentially in correspondence with the outer peripheral edge of the can bottom, which complicates the apparatus.
Further, specifically, the number of pressing bodies is five for one can body, and when the can bodies are accommodated in 6 columns and 4 rows in the case, four can bodies for one column. In order to press the pressing member, it is necessary to provide fourteen pressing members, which complicates the apparatus and requires adjustment of the arrangement position of the pressing member.
As described above, this apparatus has a problem in that the configuration is complicated and the arrangement position is adjusted. For this reason, there has been a demand for a proposal of a technique that can suppress propagation of vibration to the can body with a simpler configuration.

In addition, this apparatus has the following problems.
In this apparatus, it is assumed that a roller is used as the pressing body. Moreover, the can body is accommodated in the case and is assumed to be conveyed by a conveyor or the like. Further, inside the case, the lower surface of the upper lid portion of the case and the outer peripheral edge portion of the can bottom portion are in a separated state.
When the front surface of the case being conveyed reaches below the pressing body, the roller that is the pressing body rides over the upper portion of the front surface of the case and rolls on the upper surface of the upper lid portion of the case.
On the other hand, when the pressing body reaches above the can body, the upper lid portion of the case is pushed down from above to bring the lower surface of the upper lid portion of the case into contact with the outer peripheral edge portion of the can bottom portion.
However, in order for the pressing body to be able to push down the upper lid portion of the case, it is set in the same position as the position where the pressing body has already pushed down the upper lid portion of the case in a free state where the case has not reached the lower side. Need to be.
On the other hand, when the front surface of the case reaches the lower side, the pressing body must get over the upper front portion of the case.
In order to realize such a movement, in the apparatus, an urging means such as an elastic spring for urging the pressing body downward is attached to the upper part of the pressing body. As a result, the urging means contracts in response to the push-up from the upper front part of the case, and the pressing body moves upward so as to get over the upper front part of the case.
And immediately after that, the pressing body must push down the upper lid part of the case.
As a result, the urging means attached to the pressing body is easily contracted by being pushed up from the front surface of the case, but a forcible force is applied to the upper lid portion of the case to deform it into a concave shape. Must be pushed down.
There is a problem that it is practically impossible to realize such a movement only by the urging means, which is a spring, and it is not practical.

In addition, the percussion inspection device described in Patent Document 2 includes secondary vibration suppression means for suppressing secondary vibration generated when the can body jumps up and lands when an electromagnetic shock is applied.
This secondary vibration suppression means applies a downward force to the can body in order to prevent the can body from jumping up.
However, before the secondary vibration occurs, the primary vibration is generated in the can body, and this primary vibration is generated when an electromagnetic shock is applied to the bottom of the can. Propagates to the body and lid of the can.
On the other hand, the secondary vibration is a vibration generated when the can body jumps and lands with the generation of the primary vibration, and the secondary vibration is generated due to the primary vibration.
The secondary vibration suppression means suppresses the secondary vibration and is not intended to suppress the propagation of the primary vibration.

  The present invention has been considered in view of the above circumstances, focusing on the primary vibration generated by the application of electromagnetic shock, suppressing the propagation of the primary vibration to other than the bottom of the can with a simple configuration, and attaching the pressing member. It is an object of the present invention to provide a tapping device and a tapping method that can suppress propagation of primary vibrations in a can housed in a case even with a configuration having a biasing means.

In order to achieve this object, the percussion apparatus of the present invention applies an electromagnetic shock to the can body, receives a percussion sound emitted from the percussion vibration unit of the can body, and uses the percussion sound as a percussion signal. A punching device comprising a punching head that converts and outputs, and an arithmetic unit that analyzes the punching signal and determines the can internal pressure of the can body,
When the electromagnetic shock is applied, primary vibration suppression means for suppressing primary vibration generated in the can lid of the can body is provided.

  Further, the percussion inspection method of the present invention includes a step of applying an electromagnetic shock to the can body, a percussion sound receiving step of receiving a percussion sound emitted from the percussion vibration portion of the can body, and a percussion sound. And a step of analyzing the tapping signal and determining a can internal pressure of the can body, wherein the tapping sound receiving step includes the electromagnetic sound receiving step. As a method of receiving a tapping sound emitted from a tapping vibration unit of the can body in a state in which primary vibration generated in the can lid of the can body is suppressed by a primary vibration suppressing means when an impact is applied. is there.

According to the percussion inspection apparatus and percussion inspection method of the present invention, since the percussion inspection apparatus includes the primary vibration suppressing means, it is possible to suppress the primary vibration generated in the can lid of the can body when an electromagnetic shock is applied.
Further, the percussion inspection device of the present invention is not configured to press the outer peripheral edge of the can bottom over the entire circumference like the internal pressure inspection device described in Patent Document 1, but is configured to contact the lid of the can body, etc. Therefore, it is not necessary to prepare a large number of pressing bodies, and this can be realized by providing at least one primary vibration suppressing means for one can body. For this reason, the primary vibration generated in the can lid can be reliably suppressed with a simple configuration.
Furthermore, the primary vibration suppression means in the percussion inspection apparatus and percussion method of the present invention, when an electromagnetic shock is applied, the primary vibration generated at the bottom of the can propagates to the can lid, and the resonance vibration generated at the can lid is suppressed. Since it is a suppression means, the secondary vibration suppression means of patent document 2 can suppress the primary vibration which is not made into the object of suppression.

It is a figure which shows the structure of the inspection apparatus of 1st embodiment of this invention. It is a front view which shows the structure of a can, a pressing member, a mounting member, and a supporting member. It is an external appearance perspective view which shows the shape of the pressing member of the upper plane shape which is a column shape or a cylindrical shape. It is an external appearance perspective view which shows the shape of the upper planar pressing member which is a prismatic shape or a rectangular tube shape. It is an external appearance perspective view which shows the shape of the press member of the upper curved surface shape which has the curved surface in the upper part. It is an external appearance perspective view which shows the shape of the rotary press member which is disk shape or roll shape. It is an external appearance perspective view which shows the shape of the rotation type press member which is shapes other than disk shape and roll shape. It is an external appearance perspective view which shows the shape provided with the axis | shaft and the support body in the rotation type press member. It is a flowchart which shows operation | movement of the inspection method of 1st embodiment of this invention. It is a figure which shows the structure of the inspection apparatus and conveyance apparatus of 2nd embodiment of this invention. It is a side external view which shows a mode that a storage means is conveyed with the conveying apparatus comprised with several rollers. It is a side external view which shows a mode that a storage means is conveyed with the conveying apparatus comprised with the some conveyor. It is the external appearance perspective view and sectional drawing which show the shape of the press member of the upper curved surface shape shown in FIG.5 (ii). It is the external appearance perspective view and sectional drawing which show the shape of the press member of the upper curved surface shape shown in FIG.5 (i). It is side sectional drawing which shows the state before the accommodating means in conveyance reaches | attains a pressing member. It is side sectional drawing which shows a state when the accommodating means in conveyance reaches | attains a pressing member. It is side sectional drawing which shows the state which the storage means in conveyance got on the press member. It is a side sectional view showing the state where the pressing member is located below the first row of cans stored in the storage means. It is a side sectional view showing the state where the pressing member is located below the first row and second row of cans stored in the storage means. It is a side sectional view showing the state where the pressing member is located below the second row of cans stored in the storage means. It is a flowchart which shows operation | movement of the inspection method of 2nd embodiment of this invention. It is a wave form diagram which shows the frequency distribution of the echo vibration sound measured by the percussion inspection apparatus of this invention. It is a graph which shows the relationship between the digit based on the frequency of the echo vibration sound measured by the percussion inspection apparatus of this invention, and the internal pressure of a can body. It is a wave form diagram which shows the frequency distribution of the reverberation vibration sound measured by the conventional percussion inspection apparatus. It is a graph which shows the relationship between the digit based on the frequency of the reverberation vibration sound measured by the conventional percussion apparatus, and the internal pressure of a can body. It is sectional drawing of the storage means with which the press member which comprises the inspection apparatus of 3rd embodiment of this invention is provided, and the principal part enlarged view of this storage means.

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

[First embodiment]
First, a first embodiment of the percussion apparatus and percussion method 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.

(I) Percussion device As shown in FIG. 1, the percussion device 1 includes a percussion head 10, a calculation device 20, a placement member 30, and primary vibration suppression means 40.
The percussion head 10 includes an electromagnetic coil 11 and a microphone 12.
The electromagnetic coil 11 is an electric field generating means for applying an electromagnetic shock to the can bottom C2 positioned above the inverted can body C to forcibly excite it. In this embodiment, it is the can bottom C2 of the can body C that the electromagnetic coil 11 gives an electromagnetic shock, and this can bottom C2 becomes a percussion vibration part that generates vibration upon receiving the electromagnetic shock.
As the electromagnetic coil 11, for example, an exciter coil can be used.

  The microphone 12 detects a vibration sound generated as a result of the vibration generated in the percussion vibration unit of the can C as a percussion sound, converts the percussion sound into a percussion signal that is an electrical signal, and outputs the result. To the arithmetic unit 20.

The computing device 20 includes a frequency analysis unit 21 and a pass / fail determination unit 22.
The frequency analysis unit 21 inputs the tapping signal output from the microphone 12, performs frequency analysis of the tapping sound indicated by the tapping signal, and calculates the frequency and sound level of the tapping sound. Further, the frequency analysis unit 21 calculates the internal pressure value of the can body C based on the correlation between the frequency at which the calculated sound level indicates a peak and a preset can internal pressure value.
The pass / fail determination unit 22 determines pass / fail of the can body C based on the analysis result of the frequency analysis unit 21. For example, the internal pressure value calculated by the frequency analysis unit 21 is compared with a preset appropriate can internal pressure, and when the calculated internal pressure value is within the range of the proper can internal pressure, the internal pressure value is determined to be appropriate. The can body C is determined to be a non-defective product. On the other hand, when the calculated internal pressure value is not within the range of the appropriate can internal pressure, the internal pressure value is determined to be inappropriate, and the can C is determined to be defective.
Here, the quality determination of the can body C is performed using the calculated internal pressure value, but this quality determination can also be performed using the frequency of the tapping sound. That is, the pass / fail determination unit 22 determines that the can body C is a non-defective product when the frequency is within the frequency band corresponding to the appropriate can internal pressure. On the other hand, when the frequency is not within the frequency band corresponding to the appropriate can internal pressure, the can body C is determined to be defective.

The placement member 30 is a member having an upper surface 31 on which the can body C is placed in an inverted state.
In the present embodiment, the placement member 30 is a fixed plate-like member. However, the placement member 30 may be a movable plate-like member, a conveyor plate of a belt conveyor, or the like.
The can body C is an inspection object in which an internal pressure inspection is performed using the percussion apparatus 1 of the present embodiment. As shown in FIG. 1, it is comprised by the can body C1, the can bottom C2, and the can lid C3 of the can body C with which the drink etc. were filled and sealed. In the present embodiment, a two-piece can in which a can body C1 and a can bottom C2 are integrally formed and a can lid C3 is clamped is illustrated.
The can body C may be either a positive pressure can (filled with nitrogen gas) made of aluminum or an aluminum alloy, or a negative pressure can made of steel.

The primary vibration suppression means 40 is means for suppressing primary vibration generated in the can lid C3 of the can body C when an electromagnetic shock is applied to the can body C.
In the present embodiment, the primary vibration suppression means 40 is a pressing member 41 that directly contacts the can lid C3 of the can body C. The pressing member 41 suppresses the primary vibration generated in the can lid C3 by this contact.

When the can body C is placed on a place where the pressing member 41 can directly contact the can lid C3 of the can body C, for example, the upper surface 31 of the placement member 30, the pressing member 41 is viewed from below the can body C. It arrange | positions in the location which can contact the can lid | cover C3 directly.
Specifically, as shown in FIG. 1 and FIG. 2, the pressing member 41 has an opening 32 formed at a place where the can body C is placed on the placement member 30, The pressing member 41 is inserted from below, and the upper portion of the pressing member 41 is disposed at a position protruding upward from the upper surface 31 of the placement member 30.
Thereby, the pressing member 41 can directly contact the protruding upper portion with the can lid C <b> 3 of the can body C placed on the upper surface 31 of the placement member 30.
The opening 32 may be, for example, a circular or rectangular through-hole formed in the placement member 30 or may be formed as a gap between the two placement members 30. Also good. In the former case, the area of the opening 32 is smaller than the area of the can lid C3 of the can body C. On the other hand, in the latter case, the interval between the two placement members 30 is shorter than the diameter of the can lid C3 of the can body C.

A height T1 (see FIG. 2I) at which the upper portion of the pressing member 41 protrudes upward from the upper surface 31 of the placement member 30 is set as follows.
The can body C is formed with a tightening portion C5 in which a can lid C3 is fastened to the periphery of the end portion of the can body C1. When the can body C is inverted, the tightening portion C5 protrudes downward from the periphery of the can lid C3 and is located below the top surface portion C4 of the can lid C3.
Here, if a virtual plane passing through the top C6 at the lower end of the tightening portion C5 is a first virtual plane K1, a lid side space C7 is provided between the first virtual plane K1 and the top surface portion C4 of the can lid C3. Is virtually formed.

In this lid side space C7, when the distance from the top surface portion C4 of the can lid C3 to the first virtual plane K1 is the height C71 of the lid side space C7, the protruding height T1 of the pressing member 41 (FIG. 2 (i)). Need to be at least the same height as the height C71 of the lid side space C7 or higher than the height C71.
By setting the protruding height T1 to such a height, when the can body C in an inverted state is placed on the upper surface 31 of the placement member 30, the upper portion of the pressing member 41 is the can lid C3 of the can body C. The top surface portion C4 is contacted and pressed to the top surface portion C4 (see FIG. 2 (ii)).
In addition, protrusion height T1 of the pressing member 41 can be in the range of 0.1 mm to 10.0 mm, preferably 3.0 mm to 5.5 mm, for example. Further, the projection height T1 is selected in consideration of the can body diameter, the can lid diameter, or the configuration on the top surface portion C4 side of the can lid C3 (the shape of the tab C8, the shape of the top surface portion C4).

Moreover, the tab C8 for opening is normally provided in the top | upper surface part C4 of the can lid C3 of the can body C (refer FIG. 26), and you may make the upper part of the press member 41 contact the tab C8.
In this case, the protrusion height T1 of the pressing member 41 is the same as the height obtained by subtracting the thickness of the tab C8 from the height C71 of the lid-side space C7 or higher than this height.
Thus, in any case where the upper portion of the pressing member 41 is brought into contact with the top surface portion C4 of the can lid C3 or the tab C8 provided on the top surface portion C4 of the can lid C3, the pressing member 41 is connected to the can lid C3. Therefore, the vibration of the can lid C3 can be suppressed.
In the following description, the contact of the pressing member 41 with the lid portion C3 means the contact of the pressing member 41 with the can lid C3 (the top surface portion C4 or the tab C8).

The pressing member 41 is supported on a plate-like support member 43 located below the opening 32 of the placement member 30 via an urging means 42.
The urging means 42 urges the pressing member 41 upward, brings the pressing member 41 into contact with the can lid C3 of the can body C, and presses it.
For this urging means 42, for example, an elastic member such as a coil spring can be used.

  Further, when the protruding height T1 of the pressing member 41 is higher than the height C71 of the lid-side space C7, when the can body C is placed on the upper surface 31 of the placement member 30, the can lid of the can body C When the top surface portion C4 of C3 comes into contact with the upper portion of the pressing member 41, the pressing member 41 is pushed downward by the dead weight of the can body C filled and sealed with the contents (see FIG. 2 (ii)). At this time, the urging means 42 contracts downward in the direction opposite to the urging direction, the pressing member 41 descends, and the pressing member 41 is urged by the urging means 42 even after the lowering, and the can body The can lid C3 is securely contacted and pressed against the can lid C3.

  Moreover, the shape of the pressing member 41 should just be a shape which can contact the can lid C3 of the can body C, and here, as an example of the shape of the pressing member 41, an upper plane shape, an upper curved surface shape, and a rotation type And so on.

The upper planar shape is a shape in which the upper surface of the pressing member 41 is a horizontal plane.
Specifically, for example, as shown in FIGS. 3 and 4, a columnar shape (FIG. 3 (i)), a cylindrical shape (FIG. 3 (ii)), and a shape in which a notch 411 is formed on the upper portion of the cylindrical shape. (FIG. 3 (iii)), prismatic shape (FIG. 4 (i)), rectangular tube shape (FIG. 4 (ii)), and shape in which a notch 411 is formed in the upper portion of the rectangular tube shape (FIG. 4 (iii)). Or the like.
By making the shape of the pressing member 41 into an upper plane shape, the horizontal surface above the pressing member 41 can be brought into contact with the can lid C3 of the can body C. Thereby, the primary vibration which arises in this can lid C3 can be suppressed.
Further, by forming a notch 411 in the upper part of the cylindrical shape or the upper part of the rectangular tube shape (FIGS. 3 (iii) and 4 (iii)), the top surface portion C4 of the can lid C3 is provided. The primary vibration can be suppressed by directly contacting the top surface portion C4 while avoiding contact with the tab C8.

The upper curved surface shape is a shape having a curved surface CS above the pressing member 41.
Specifically, for example, as shown in FIG. 5, a shell type (FIG. (I)), an arch type (FIG. (Ii)), a sloped arch type (FIG. (Iii)), a disk top It is possible to adopt a shape such as a shape in which a bullet shape is provided (Fig. (Iv)), a mountain shape (Fig. (V)), and the like.
By making the shape of the pressing member 41 an upper curved surface, the top of the curved surface CS of the pressing member 41 can be brought into contact with the can lid C3 of the can body C. Thereby, the primary vibration which arises in this can lid C3 can be suppressed.
In the case of the upper curved surface, the contact area between the top of the curved surface CS of the pressing member 41 and the can lid C3 of the can body C is reduced, and the force by which the pressing member 41 presses the can lid C3 is the contact portion. Therefore, the primary vibration generated in the can lid C3 can be reliably suppressed.

The rotation type rotates or rotates around a rotation axis that is passed through the central portion of the pressing member 41 in the horizontal direction.
Specifically, for example, as shown in FIGS. 6 and 7, a disk shape (FIG. 6 (i)), a roll shape (FIG. 6 (ii)), and a roll shape with an inclined surface (FIG. 6 (iii)). , Cubic or rectangular parallelepiped (Fig. 7 (i)), polygonal column shape (Fig. 7 (ii)), gear shape (Fig. 7 (iii)), cam shape (Fig. 7 (iv)), cylindrical peripheral surface A shape such as a shape in which a plurality of convex portions 413 are formed (FIG. 7 (v)) can be used.
By making the shape of the pressing member 41 into a rotational shape, the peripheral surface DS of the pressing member 41, the gear-shaped tooth end, the cam-shaped protruding portion 412, and the convex portion 413 formed on the cylindrical peripheral surface can C can lid C3. Thereby, the primary vibration which arises in this can lid C3 can be suppressed.
In addition, when the can body C moves in one direction, the rotary type can keep contacting the can lid C3 while rotating while following the movement, so that the primary vibration generated in the can lid C3. Can be reliably suppressed.

When the pressing member 41 is a rotary type, as shown in FIG. 8, the pressing member 41 is supported by a shaft 414, and a support body 415 that supports the shaft 414 is provided.
The pressing member 41 provided with the shaft 414 and the support body 415 is disposed on the upper surface of the support member 43.

  Thus, the shape of the pressing member 41 can be appropriately selected from the shapes shown in FIGS. 3 to 7, but the shape of the pressing member 41 is not limited to these shapes, and cans Any shape that can contact the can lid C3 of the body C may be used.

  As the material constituting the pressing member 41, for example, synthetic resin, hard rubber, metal, or the like can be used. However, as the material constituting the pressing member 41, the pressing member 41 can be processed into a desired shape, has a predetermined hardness and wear resistance, and has a top of the can lid C3 of the can body C. A material that does not damage the surface C4 and the tab C8 is desirable.

(II) Percussion Method Next, the percussion method of the present embodiment, which is the operation of the percussion apparatus, will be described with reference to FIG.
This figure is a flowchart showing each step of the percussion inspection method of the present embodiment.
Note that the configuration of the percussion apparatus 1, particularly the configuration of the pressing member 41, the mounted member 30, the support member 43, etc., is the configuration shown in FIGS. 1 and 2.

On the upper surface 31 of the placement member 30, the can body C is placed in an inverted state above the opening 32 (can body placing step, S10).
Thereby, the pressing member 41 contacts the can lid C3 of the can body C, and presses this can lid C3.

The punching head 10 is placed above the bottom C2 of the can body C (punching head placement step, S11).
Then, a current is passed through the electromagnetic coil 11 of the inspection head 10. Thereby, an electromagnetic shock is given to the can bottom C2 of the can body C (electromagnetic shock giving step, S12).
In the can bottom C2 of the can body C to which electromagnetic shock is applied, primary vibrations are generated and vibration noise is generated. This vibration sound is detected as a tapping sound by the microphone 12 of the tapping head 10 (tacking sound receiving step, S13).
The detected tapping sound is converted into a tapping signal by the microphone 12 and output from the microphone 12 and transmitted to the arithmetic unit 20 (tacking signal output step).

The frequency analysis unit 21 of the arithmetic unit 20 performs frequency analysis of the tapping signal (tacking signal analysis step, S14), and determines the can internal pressure of the can body C based on the analysis result (can internal pressure detection). Step, S15).
And in the quality determination part 22 of the arithmetic unit 20, the quality determination of the can body C is performed based on the determined can internal pressure (quality determination step, S16).

Further, in the electromagnetic shock applying step shown in S12, when an electromagnetic shock is applied to the can bottom C2 of the can body C, the primary vibration generated in the can bottom C2 attempts to propagate from the can body C1 to the can lid C3. To do. However, since the pressing member 41 is in contact with the can lid C3 of the can body C, propagation of the primary vibration is suppressed.
Thereby, no vibration sound is generated from the can lid C3 of the can body C, and the vibration sound is not detected by the microphone 12 in the percussion sound receiving step shown in S13.
For this reason, the microphone 12 can detect only the vibration sound generated at the bottom C2 of the can C as a tapping sound, and the frequency analysis unit 21 of the arithmetic unit 20 performs measurement based on the tapping sound. The frequency analysis of the tapping signal can be performed with only the frequency of the tapping sound from the can bottom C2. And in the quality determination part 22 of the arithmetic unit 20, by determining whether the internal pressure value corresponding to the frequency of the tap sound from the can bottom C2 is within the range of the appropriate can internal pressure, A pass / fail judgment can be made.
Therefore, in the quality determination unit 22 of the arithmetic unit 20, the erroneous determination that the can body C, which is the proper internal pressure, is a defective product is avoided by the vibration sound generated from the can lid C3 of the can body C. Thereby, the precision of the quality determination of the can body C improves.

As described above, according to the percussion apparatus and percussion method of the present embodiment, the structure includes primary vibration suppression means that suppresses the primary vibration generated in the can lid of the can body when an electromagnetic shock is applied. As a result, the primary vibration generated in the can lid can be suppressed.
Thereby, the vibration sound resulting from the primary vibration generated in the can lid is not detected by the microphone, and erroneous determination based on the vibration sound can be avoided in the quality determination of the arithmetic device. Therefore, the precision of can defective product detection can be improved.

Further, the percussion testing apparatus and percussion testing method of the present embodiment have the following effects in comparison with the technique described in Patent Document 1.
Since the internal pressure inspection apparatus described in Patent Document 1 includes a large number of pressing bodies that press the outer peripheral edge portion of the can bottom of the can body, the structure of the apparatus is complicated.
On the other hand, according to the percussion apparatus of the present invention, there is one pressing member corresponding to one can, and thus the configuration is simplified.
Moreover, while having a very simple configuration with only one pressing member in this way, the same effect as the pressing body of the internal pressure inspection apparatus described in Patent Document 1 is achieved. That is, the pressing member of the present invention can suppress the primary vibration generated at the bottom of the can body from propagating to the can body and the can lid by contacting and pressing the can lid of the can body. . For this reason, the peak frequency measured by the frequency analysis unit of the arithmetic unit is only the frequency of the percussion sound generated at the bottom of the can, and no peak is measured in other frequency bands, improving the accuracy of the can body quality determination. Can be made.

Furthermore, the percussion testing apparatus and percussion testing method of the present embodiment have the following effects in comparison with the technique described in Patent Document 2.
The percussion inspection device described in Patent Document 2 includes secondary vibration suppression means that suppresses secondary vibration that occurs when a can body jumps and lands when an electromagnetic shock is applied.
The secondary vibration suppression means is provided to suppress the secondary vibration and is not intended to suppress the propagation of the primary vibration.
On the other hand, the inspection device of the present invention is intended to suppress the propagation of the primary vibration, and in this respect, the inspection device of the present invention is different from the inspection device described in Patent Document 2.
Moreover, the secondary vibration suppression means described in Patent Document 2 applies a downward force from above to the can body in order to prevent the can body from jumping up.
In contrast, the percussion apparatus of the present invention applies an upward force from below to the can lid in order to suppress the primary vibration generated in the can lid of the can body. Also in this point, the inspection device of the present invention is different from the inspection device described in Patent Document 2.
Thus, the percussion inspection apparatus of the present invention and the secondary vibration suppression means described in Patent Document 2 have different actions on the can body and have different purposes.

[Second Embodiment]
Next, a second embodiment of the percussion apparatus and percussion method of the present invention will be described with reference to FIG.
FIG. 3 is a plan view showing the configuration of the percussion inspection apparatus according to the present embodiment.
This embodiment is different from the first embodiment in that the percussion inspection apparatus includes a transport device that transports the storage means in which the can body is stored. Further, in the first embodiment, the pressing member of the percussion device is installed at a position in direct contact with the can lid of the can body that is conveyed alone via the placement member. In the embodiment, the pressing member is installed in the transport device that transports the storage means (case) in which the can body is stored. Other components are the same as those in the first embodiment.
Therefore, in FIGS. 10 to 25, the same components as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

(I) Percussion apparatus The percussion apparatus 1 of this embodiment is provided in the conveyance apparatus 50 which conveys the storage means S which accommodated the some can body C. FIG.
Here, the configuration of the transport device 50 will be described first, and then the configuration of the inspection device 1 other than the transport device 50 will be described.

As shown in FIG. 10, the transport device 50 includes a carry-in path 51, a discharge section 52, a carry-out path 53, a discharge path 54, and defective product exclusion means 55.
The carry-in path 51 is a movable path for transporting the storage means S to be transported to the carry-out path 53 or the discharge path 54 via the evacuation part 52, and as shown in FIG. 11, the roller 61 or FIG. As shown in FIG. 5, the rotating bodies 60 such as the conveyor 62 are arranged to constitute a conveyance path.
And the rotary body 60 of this carrying-in path 51 rotates by the drive by the drive motor which is not shown in figure.

The storage means S is, for example, a box formed of thick paper such as corrugated cardboard, and deforms when a certain amount of external pressure is applied. Inside, a plurality of cans C filled with contents and sealed are contained. It is stored. In the example shown in FIG. 10, 6 cans in the conveying direction and 4 cans in a direction orthogonal to this direction, that is, a total of 24 cans in 4 rows and 6 columns, are accommodated in the accommodating means S.
The storage means S is placed on the carry-in path 51 so that the stored can body C is in an inverted state. That is, as shown in FIG. 11, the top surface portion C4 of the can lid C3 of the can body C stored in the storage means S and the second virtual plane K2 formed by the carry-in path 51 are the bottom plate portion S1 of the storage means S. The storage means S is placed on the carry-in path 51 in an opposing posture. Thereby, in the inside of the can body C, a space is formed between the upper part of the contents and the can bottom C2.

The evacuation unit 52 distributes the storage means S conveyed from the carry-in path 51 to the carry-out path 53 or the discharge path 54, and the carry-out path 53 uses the storage means S sent from the evacuation part 52 as a non-defective product. The discharge path 54 discharges the storage means S sent from the discharge portion 52 as a defective product.
Similar to the carry-in path 51, the carry-out path 53 and the discharge path 54 are configured by arranging the rotating bodies 60 as transport paths.

The defective product removing means 55 distributes the storage means S transported from the carry-in path 51 to the discharge section 52 to the path of the discharge path 54.
The defective product removing means 55 includes an air cylinder (not shown) for pushing the storage means S from the discharge portion 52 toward the discharge path 54, and a drive control portion (not shown) for driving the air cylinder. Can be provided.
Then, the defective product exclusion means 55 performs the distribution based on the determination result in the pass / fail determination unit 22 of the inspection device 1.
For example, when it is determined that all of the plurality of cans C stored in the storage unit S are non-defective as a result of the determination in the pass / fail determination unit 22, the storage unit S is removed without driving the air cylinder. It is sent to the carry-out path 53 via the part 52. On the other hand, when it is determined that there are defective products in the plurality of cans C stored in the storage means S, the air cylinder is driven to discharge the storage means S from the discharge portion 52 to the discharge path 54.

The tapping device 1 is provided in the transport device 50 and includes a tapping head 10, a calculation device 20, and primary vibration suppression means 40.
Here, as shown in FIGS. 11 and 12, the inspection head 10 is disposed at a position higher than the height of the storage means S with respect to the loading path 51 in the downstream portion of the loading path 51.
Then, the storage means S is conveyed by the rotating body 60 of the carry-in path 51 and passes directly below the inspection head 10, whereby the internal pressures of the can bodies C stored in the storage means S are individually and sequentially inspected.

A predetermined number (in this embodiment, four) of the inspection heads 10 are continuously arranged in a direction intersecting the transport direction, and as shown in FIG. The positions are shifted.
That is, the connecting direction of the inspection head 10 and the direction orthogonal to the conveying direction have a predetermined angle, and this angle is determined by the microphone 12 of the can body C to be detected by the adjacent microphone 12. For example, it is determined by the conveyance speed of the storage means S, the material of the can body C, the can size, and the like so that the time interval at which the tap sound from the can bottom C2 is not detected.

  In the present embodiment, the primary vibration suppression means 40 presses the bottom plate portion S1 of the storage means S from below to bring the inner surface S2 of the bottom plate portion S1 into contact with the can lid C3 of the can body C. The primary vibration that occurs in the can lid C3 is suppressed by the proper pressing (see FIG. 18).

  As shown in FIG. 11, the pressing member 41 is disposed immediately below the inspection head 10 in the downstream portion of the carry-in path 51. In the present embodiment, four punching heads 10 are provided, and four pressing members 41 are disposed immediately below the four punching heads 10, one each.

And when the storage means S of the carrying-in path 51 makes the mounting surface to be mounted the second virtual plane K2, the lower part of the pressing member 41 is positioned below the mounting surface of the loading path 51. The upper part protrudes upward from the second virtual plane K2.
For this reason, the storage means S transported by the rotating body 60 of the carry-in path 51 and the stored can body C reach the position where the pressing member 41 is disposed, and the pressing member 41 is positioned below (see FIG. 18). ), The storage means S and the can body C push down the pressing member 41 by its own weight. A bottom plate portion S1 of the storage means S is interposed between the can body C stored in the storage means S and the pressing member 41, and a lid is provided between the inner surface S2 of the bottom plate portion S1 and the can body C. A side space C7 is formed, and the pressing member 41 presses the bottom plate portion S1 from below (up) to deform it into a mountain shape, and the inner surface S2 of the bottom plate portion S1 is formed on the can lid C3 of the can body C3. By contacting the top surface portion C4, the can lid C3 is indirectly pressed.
As a result, even if an electromagnetic shock is applied to the can body C from the inspection head 10 and primary vibration is generated in the can bottom C2 of the can body C, the pressing member 41 is interposed via the bottom plate portion S1 of the storage means S. Since the can lid C3 is continuously pressed, propagation of primary vibration from the can bottom C2 to the can lid C3 is suppressed. Therefore, the primary vibration generated in the can lid C3 can be suppressed.

The shape of the pressing member 41 is the same as that of the pressing member 41 of the first embodiment, ie, an upper flat shape (see FIGS. 3 and 4), an upper curved surface shape (see FIG. 5), and a rotating shape (see FIGS. 6 and 7). ) And the like.
However, in the present embodiment, since the storage means S being transported needs to pass above the pressing member 41 by the rotating body 60 of the transport device 50, the shape thereof is an upper curved surface shape or a rotational shape (see FIG. 5 to 7).

  Then, the installation of the pressing member 41 to the carry-in path 51 is basically such that the curved surface CS (in the case of the upper curved surface) and the peripheral surface DS (in the case of the rotary type) of the pressing member 41 are conveyed on the carry-in path 51. The pressing member 41 is installed in the carry-in path 51 so as to face the conveying direction of the storage means S.

  Specifically, when the shape of the pressing member 41 is, for example, the upper curved surface shown in FIGS. 5 (ii), (iii), and (v), the curved surface CS formed on the pressing member 41 is a rectangular shape. The shape is a curved plane. Specifically, as shown in FIG. 13, the curved surface CS has a shape in which two opposite sides of a rectangular plane are parallel and the other two sides are curved while maintaining this parallel. . The direction when the pressing member 41 having such a shape is installed in the carry-in path 51 is orthogonal to the line pl when a line pl parallel to two opposite sides that are kept parallel is drawn on the top tp of the curved surface CS. The direction perpendicular to the horizontal direction vd is the direction orthogonal to the vertical direction vd. The vertical direction vd is a direction along the transfer direction of the storage means S by the carry-in path 51 (the same direction as the transfer direction or opposite to the transfer direction). Direction), the pressing member 41 is installed in the carry-in path 51.

In the same shape, the width w1 (see FIG. 5) between the two curved sides of the rectangular plane of the curved surface CS is made smaller than the diameter of the can lid C3 of the can body C. This is because the pressing member 41 pushes up the bottom plate portion S1 of the storage means S, and the pushed up portion is accommodated in the lid side space C7 formed between the inner surface S2 of the bottom plate portion S1 and the can body C, and the storage means. This is because the bottom plate portion S1 of S reaches the can lid C3 of the can body C.
Specifically, the width w1 is desirably in the range of 0.1 mm to 62.0 mm.

  Further, the longitudinal cross-sectional shape in one direction constituting the radius of curvature of the pressing member 41 is the radius of curvature of the curved surface CS (see FIG. 13 (ii)) in the cross section, and the top portion tp of the can lid C3 (top) It can be set as appropriate as long as it is in contact with the surface portion C4 or the tab C8) and within the tightening portion C5.

Furthermore, when the shape of the pressing member 41 is, for example, the bullet type shown in FIGS. 5 (i) and (iv), the installation on the carry-in path 51 is performed at the curved surface at the tip as shown in FIGS. (I) and (iv). The top tp of CS is the upper side.
The bullet-shaped curved surface CS may be completely hemispherical or not hemispherical. For example, as shown in FIG. 14 (ii), the shape of the curved surface CS in a cross section when the pressing member 41 is cut in the vertical direction through the top tp of the curved surface CS may be semicircular, Alternatively, an elliptical shape that is long in the horizontal direction or an elliptical shape that is long in the vertical direction may be used.

Further, in the case of this bullet type, the radius of curvature (see FIG. 14 (ii)) of the curved surface CS in the cross section when the pressing member 41 is cut in the longitudinal direction through the top portion tp of the curved surface CS is such that the top portion tp is the top surface portion. It can be set appropriately within a range that contacts C4 and fits between the tightening portions C5.
Furthermore, when the shape of the pressing member 41 is, for example, the upper curved surface shown in FIGS. 5 (ii), (iii), and (v), the curvature radius (see FIG. 13 (ii)) of the curved surface CS is also similar. It can be set as appropriate as long as the top portion tp comes into contact with the top surface portion C4 and falls between the tightening portions C5.
Then, as described above, by appropriately selecting the radius of curvature of the curved surface CS, the slipperiness of the storage means S passing above the pressing member 41 is improved, and the transport of the storage means S by the transport device 50 is performed smoothly. be able to.

Moreover, when the shape of the pressing member 41 is, for example, the rotational shape shown in FIGS. 6 and 7, the pressing member 41 is installed in the carry-in path 51 as follows.
When the direction in which the pressing member 41 rotates and the upper end portion of the pressing member 41 moves is defined as the upper end rotation direction rd, the upper end rotation direction rd is the same direction as the conveying direction of the storage means S in the carry-in path 51. The pressing member 41 is installed in the carry-in path 51 so that
By installing the pressing member 41 in such a direction, the direction in which the storage means S moves coincides with the direction in which the pressing member 41 rotates and the upper end portion moves. Easy to get on.

Furthermore, when the shape of the pressing member 41 is a rotational shape, the axial widths w2 to w4 on the peripheral surface DS of the pressing member 41 (in the pressing member 41 shown in FIG. 6 (ii), the axial width of the roll-shaped peripheral surface DS in the pressing member 41. In the press member 41 shown in FIG. 7 (i), (ii), and (iv), the width w3 in the axial direction on the circumferential surface DS, and the pressing member 41 shown in FIG. Width w4. In the pressing member 41 shown in FIG.7 (v), the axial width w3 in the convex part 413 is made shorter than the diameter of the can lid C3 of the can body C. FIG. This is because the pressing member 41 pushes up the bottom plate portion S1 of the storage means S, and the pushed up portion is accommodated in the lid side space C7 formed between the inner surface S2 of the bottom plate portion S1 and the can body C, and the storage means. This is because the bottom plate portion S1 of S reaches the can lid C3 of the can body C.
Specifically, the widths w2 to w4 are preferably within a range of 0.1 mm to 62.0 mm.

In addition, when the shape of the pressing member 41 is a polygonal columnar rotational shape in which the cross-sectional shape orthogonal to the axial direction of FIGS. 7 (i) and (ii) is a polygon, the length of one side of the polygon n1 (the length n1 from one corner 416 of the polygon to the next corner 416) is the can of each of the two cans C arranged in the transport direction among the plurality of cans C stored in the storage means S. The length is an integral fraction of the distance between the centers of the lid C3.
Further, when the shape of the pressing member 41 is the cam shape of FIG. 7 (iv), or the shape of the pressing member 41 is a shape in which a plurality of convex portions 413 are formed on the cylindrical peripheral surface of FIG. 7 (v). The length n2 from one protrusion 412 to the adjacent protrusion 412 in the cam shape and the length n3 from one protrusion 413 to the adjacent protrusion 413 in the shape of FIG. Of the plurality of cans C stored in S, the length is an integral fraction of the distance between the centers of the can lids C3 of the two cans C arranged in the transport direction.
By making the pressing member 41 into such a shape, the pressing member 41 is positioned below the lid side space C7 of one can body C, and the corner portion 416, the protruding portion 412, and the protruding portion 413 of the pressing member 41 are formed. Positioned below the bottom plate portion S1 of the storage means S, the bottom plate portion S1 is pushed up from below to bring the inner surface S2 of the bottom plate portion S1 into contact with the top surface portion C4 of the can lid C3 of the can body C. Thereafter, when the storage means S moves and the pressing member 41 is positioned below the lid-side space C7 of the adjacent can body C, the other corner portion 416, the protruding portion 412 and the protruding portion of the pressing member 41 413 is located below the lid-side space C7, and the other corner 416, protrusion 412, convex 413 (adjacent corner 416, two-end or three-end corner 416, etc. ) Pushes up the bottom plate portion S1 of the storage means S from below to bring the inner surface S2 of the bottom plate portion S1 into contact with the top surface portion C4 of the can lid C3 of the can body C.
As described above, when the corner portion 416, the protruding portion 412, and the convex portion 413 of the pressing member 41 push up the outer surface S3 of the bottom plate portion S1 of the storage means S, the pushing force is increased by the corner portion 416, the protruding portion 412 of the pressing member 41, Since it concentrates on the edge part of the convex part 413, the inner surface S2 of the baseplate part S1 of the storage means S can be made to contact the top | upper surface part C4 of the can lid C3 of the can body C reliably.

  Further, the pressing member 41 can have a gear shape as shown in FIG. 7 (iii). By adopting such a shape, when the lower part of the front surface part S4 in the transport direction of the storage means S is in contact with the pressing member 41, the grooves formed on the outer peripheral surface correspond to the lower parts of the front surface part S4. The storage unit S can be smoothly climbed onto the pressing member 41.

The pressing member 41 is supported so as to be pressed from below toward the bottom plate portion S1 of the storage means S.
Specifically, for example, when the pressing member 41 is an upper plane shape or an upper curved surface shape, an urging means 42 for urging the pressing member 41 upward from the lower side is provided below the pressing member 41. The pressing member 41 is supported by the biasing means 42 (see FIG. 1). When the pressing member 41 is supported by the biasing means 42, a support member 43 is disposed below the position where the pressing member 41 is disposed in the carry-in path 51, and the biasing means is provided on the upper surface of the support member 43. 42 and the pressing member 41 are arranged.

The urging means 42 can be an elastic member such as a coil spring, as with the urging means 42 in the first embodiment.
Further, for example, an air cylinder or a driving device such as a motor and a cam can be used as the biasing means 42.
The drive device moves the pressing member 41 in the vertical direction, and pushes up the pressing member 41 to push up the bottom plate portion S1 of the storage means S to contact the top surface portion C4 of the can lid C3 of the can body C.
When a driving device is used as the urging means 42, the pressing force when the pressing member 41 presses the bottom plate portion S1 of the storage means S is 0.01 to 0.25 MPa (aluminum can having an internal capacity of 500 g). Assume that 30 cans of C are stored in the storage means S). By setting the pressing force in such a range, when the storage means S is corrugated paper, the pressing member 41 reliably pushes up the bottom plate portion S1 of the storage means S and suppresses the primary vibration generated in the can lid C3. it can.

  Further, when the pressing member 41 is the rotary type shown in FIGS. 6 and 7, a shaft 414 that rotatably supports the pressing member 41 is pivotally supported at the center of the pressing member 41 as shown in FIG. 8. In addition, a support body 415 that supports the shaft 414 is provided. When the pressing member 41 is supported by the shaft 414 and the support body 415, the support member 43 is disposed below the position where the pressing member 41 is disposed in the loading path 51, and the support body 415 is disposed on the upper surface of the support member 43. The shaft 414 and the pressing member 41 can be disposed.

As shown in FIG. 11, the pressing member 41 having such a shape and function is provided between two rollers 61 at the inspection position among the plurality of rollers 61 constituting the carry-in path 51.
The distance D12 between the two rollers 61 where the pressing member 41 is located can be appropriately selected within the range as long as the pressing member 41 can be arranged to be movable or rotatable in the vertical direction.

Moreover, when the carrying-in path 51 is comprised by the some conveyor 62, as shown in FIG. 12, the press member 41 is provided between the two conveyors 62 in an test | inspection position among the some conveyors 62. As shown in FIG.
Among the plurality of conveyors 62, the interval D22 between the two conveyors 62 where the pressing member 41 is positioned can be appropriately selected within the range as long as the pressing member 41 can be arranged to be movable in the vertical direction or to be rotatable.

Furthermore, as shown in FIGS. 11 and 12, the pressing member 41 is disposed in a state of protruding upward from the second virtual plane K <b> 2 that is the upper surface of the carry-in path 51. The height T2 at which the pressing member 41 protrudes upward from the second virtual plane K2 can be in the range of 0.1 mm to 10.0 mm, preferably 3.0 mm to 5.5 mm. In addition, the projection height T2 is selected in consideration of the can body diameter, the can lid diameter, or the configuration of the can lid C3 on the top surface portion C4 side (the shape of the tab C8, the shape of the top surface portion C4).
By setting the protruding height T2 to such a height, it is easy to get on the upper portion of the pressing member 41 of the storage means S being conveyed, and the pressing member 41 pushes up the bottom plate portion S1 of the storage means S, The inner surface S2 of the bottom plate portion S1 can be brought into contact with the can lid C3 of the can body C.

Next, operation | movement of the storage means S conveyed by the carrying-in path 51 of the conveying apparatus 50 is demonstrated with reference to FIGS.
In addition, the press member 41 shall be a rotation type.

A storage means S in which a plurality of cans C are stored is placed on the upper surface of the carry-in path 51. In this state, the rotating body 60 (for example, the roller 61) of the carry-in path 51 rotates, so that the storage unit S is conveyed from the upstream side to the downstream side of the carry-in path 51 (FIG. 15).
The storage means S transported from the upstream side of the carry-in path 51 reaches the position where the pressing member 41 is arranged on the way to the downstream side (FIG. 16).
At this time, the lower portion of the front surface portion S4 in the transport direction of the storage means S contacts the pressing member 41.

Next, the rotating body 60 of the carry-in path 51 continues to operate to convey the storage means S to the downstream side, and the pressing member 41 rotates due to friction with the bottom plate portion S1 of the storage means S. Then, the storage means S rides above the pressing member 41 (FIG. 17).
In FIG. 17, the pressing member 41 rotates clockwise.
At this time, the pressing member 41 is pushed downward by the weight of the storage means S and the can body C that are carried on, but the upper portion of the pressing member 41 is above the second virtual plane K2 that is the upper surface of the loading path 51. It is in a state protruding.

In this state, the upper surface of the pressing member 41 is in contact with the outer surface S3 of the bottom plate portion S1 of the storage means S, and the pressing member 41 is positioned immediately below the front surface portion S4 of the storage means S, and then the can body C is tightened. It is located directly below the part C5.
In this state, since the bottom plate portion S1 of the storage means S exists between the pressing member 41 and the tightening portion C5 and there is no space, the storage means S rides on the pressing member 41. As a result, the storage means S is lifted by a height T2 at which the pressing member 41 protrudes upward from the second virtual plane K2, and the outer surface S3 of the bottom plate portion S1 of the storage means S and the upper surface of the carry-in path 51 are separated from each other. To do.

Furthermore, if conveyance of the storage means S by the rotary body 60 of the carrying-in path 51 continues, the pressing member 41 will be in the lid side space C7 formed between the inner surface S2 of the bottom plate part S1 of the storage means S and the can body C. It comes to be located directly below (FIG. 18).
In this case, since the lid side space C7 exists between the top surface portion C4 of the can lid C3 of the can body C and the inner surface S2 of the bottom plate portion S1 of the storage means S, the can filled and sealed with the contents The storage means S in which the body C is stored tends to descend, and the pressing member 41 pushes up the bottom plate portion S1 of the storage means S upward from below the lid side space C7. Thereby, the inner surface S2 of the bottom plate portion S1 of the storage means S comes into contact with the top surface portion C4 of the can lid C3 of the can body C.

In this state, when an electromagnetic shock is applied to the can body C from the punching head 10, primary vibration is generated in the can bottom C2 of the can body C. Since the inner surface S2 of the bottom plate portion S1 of the means S is in contact, the propagation of primary vibration from the can bottom C2 to the can lid C3 is suppressed.
For this reason, no vibration sound is generated from the can lid C3 of the can body C, and this vibration sound is not detected by the microphone 12. Therefore, the frequency of the tapping sound measured by the frequency analysis unit 21 of the arithmetic unit 20 is low. Only the frequency due to the percussion sound from the can bottom C2 is obtained, and the accuracy of the quality determination of the can body C can be improved.

  Then, if the conveyance of the storage means S by the rotating body 60 in the carry-in path 51 continues, the electromagnetic shock from the inspection head 10 to the can body C after the next row of can bodies C is similarly transported. Is given, and the quality of the can body C is judged (FIGS. 19 and 20).

Thus, if conveyance of storage means S by rotating body 60 of carrying-in way 51 continues, press member 41 will cover lid of said can body C for every row of a plurality of can bodies C stored in storage means S. It is located directly under the side space C7 and pushes up the bottom plate portion S1 of the storage means S so as to contact the top surface portion C4 of the can lid C3 of the can body C.
For this reason, in the frequency analysis part 21 of the arithmetic unit 20, since the frequency of the tap sound transmitted from the microphone 12 is only the frequency of the tap sound from the can bottom C2, it is stored in the storage means S. The accuracy of the pass / fail judgment can be improved for all of the can bodies C.

(II) Percussion Method Next, a percussion method that is an operation of the percussion apparatus of the present embodiment described above will be described with reference to FIG.
This figure is a flowchart showing each step of the percussion inspection method of the present embodiment.
In addition, the press member 41 shall be a rotation type.
The configurations of the percussion inspection device 1 and the conveyance device 50 are the same as those shown in FIGS. 10 and 11.

The storage means S in which the can body C is stored is placed at a predetermined position in the upstream portion of the carry-in path 51.
As the rotating body 60 configuring the carry-in path 51 rotates, the storage unit S is transported in the transport direction (storage unit transport step, S20).
When the storage means S reaches the position where the pressing member 41 is disposed and the rotating body 60 of the carry-in path 51 further rotates, the storage means S rides above the pressing member 41.
When the rotary body 60 of the carry-in path 51 further rotates, the pressing member 41 is positioned below the lid side space C7 of the can body C stored in the storage means S, and the pressing member 41 is the bottom plate portion of the storage means S. S1 is pushed up from below. Thereby, inner surface S2 of bottom plate part S1 of storage means S contacts top surface part C4 of can lid C3 of can body C (can lid contact step, S21).

Then, the electromagnetic coil 11 of the punching head 10 is energized, and an electromagnetic shock is applied to the can bottom C2 of the can body C (electromagnetic shock applying step, S22).
Vibration sound is generated at the bottom C2 of the can C to which electromagnetic shock is applied, and this vibration sound is detected as a tapping sound by the microphone 12 of the tapping head 10 (tacking sound receiving step, S23).
The detected tapping sound is converted into a tapping signal of an electrical signal by the microphone 12, output from the microphone 12, and transmitted to the arithmetic unit 20 (tacking signal output step).

The frequency analysis unit 21 of the arithmetic unit 20 performs frequency analysis of the tapping signal (tacking signal analysis step, S24), and determines the can internal pressure of the can body C based on the analysis result (can internal pressure detection). Step, S25).
And in the quality determination part 22 of the arithmetic unit 20, the quality determination of the can body C is performed based on the determined can internal pressure (quality determination step, S26). Here, the can body C determined to be defective is removed by the defective can removing means 55 (defective can removing step, S27).

Further, in the electromagnetic shock applying step shown in S22, when an electromagnetic shock is applied to the can bottom C2 of the can body C, the primary vibration generated in the can bottom C2 attempts to propagate from the can body C1 to the can lid C3. However, since the inner surface S2 of the bottom plate portion S1 of the storage means S is in contact with the can lid C3 of the can body C, propagation of the primary vibration is suppressed.
Thereby, no vibration sound is generated from the can lid C3 of the can body C, and this vibration sound is not detected by the microphone 12 in the percussion sound receiving step shown in S23.
For this reason, the microphone 12 can receive only the vibration sound generated at the bottom C2 of the can body C as the tapping sound, and the frequency analysis unit 21 of the arithmetic unit 20 is measured based on the tapping sound. The frequency can be only the frequency of the percussion sound from the can bottom C2. And in the quality determination part 22 of the arithmetic unit 20, by determining whether the internal pressure value corresponding to the frequency of the tap sound from the can bottom C2 is within the range of the appropriate can internal pressure, A pass / fail judgment can be made.
Therefore, in the quality determination unit 22 of the arithmetic unit 20, the erroneous determination that the can body C, which is the proper internal pressure, is a defective product is avoided by the vibration sound generated from the can lid C3 of the can body C. Thereby, the precision of the quality determination of the can body C improves.

(III) Examples Next, examples of the present embodiment will be described with reference to FIGS.

  The inventor of the present invention uses the percussion device 1 of the present embodiment including the pressing member 41 that is the primary vibration suppression means 40 and the percussion device that does not include the primary vibration suppression means 40, so that the can body C The quality of the can internal pressure was judged.

For the can body C, an aluminum can body C having an internal capacity of 200 g was prepared.
This can body C was filled with 185 g of water and sealed.
The storage means S used was formed in a rectangular parallelepiped shape using corrugated paper.
In this storage means S, 4 × 6 = 24 can bodies C were stored.
The conveyance device 50 having the configuration shown in FIG. 10 was used.

Example 1
In the downstream portion of the carry-in path 51 of the transport device 50, the inspection head 10 is disposed above the carry-in path 51, and the pressing member 41 is disposed directly below the inspection head 10. The number of punching heads 10 and pressing members 41 is four, which is the same as the number of rows of can bodies C stored in the storage means S.
Then, the storage means S is placed and transported on the rotating body 60 on the upstream side of the carry-in path 51, and the can body C is hit according to the process shown in the flowchart of FIG. 21 and stored in the storage means S. In addition, tapping sound was detected from all 24 can bodies C, and frequency analysis was performed for each tapping sound.

The result of this frequency analysis is shown in FIG.
The figure is a graph showing the result of frequency analysis for one can C selected from 24 cans C. FIG. The horizontal axis indicates the frequency, and the vertical axis indicates the acoustic level (sound pressure value) of the tapping sound.
As shown in the figure, in this frequency distribution, the peak value of the sound level was measured in the vicinity of 4.6 kHz. In addition, in other frequency bands, the sound level showing a high value that could be called a peak value was not measured.

Further, the inventor prepares a plurality of can bodies C having different internal pressures, stores the plurality of can bodies C in the storage means S, performs a test according to the process shown in the flowchart of FIG. The tapping sound was detected from all of the cans C housed in the container, and frequency analysis was performed for each tapping sound.
The relationship between the internal pressure and the digit (percussion value, 1/10 of the frequency) was graphed based on the measured percussion sound frequency for all of the plurality of cans C having different internal pressures.

This graph is shown in FIG.
As shown in the figure, the internal pressure and the digit are shown in a linear relationship, and the variation of the digit with respect to one internal pressure is very small.
From this result, it was found that by using the pressing member 41 as the primary vibration suppressing means 40, the peak value in the frequency distribution can be specified as one, and the accuracy of the quality determination of the can body C can be improved.
In addition, since a linear relationship is obtained in the relationship between the internal pressure and the digit in this way, it is possible to determine the internal pressure of the can body C and seal leakage, and also to determine defective products such as non-standard products. I was able to prove it.

(Comparative Example 1)
In the conveying device 50 having the configuration shown in FIG. 10, the hitting device 1 having the configuration shown in FIG. 10 is arranged, but the pressing member 41 is not arranged in the carry-in path 51 of the conveying device 50.

The storage means S was placed on the rotating body 60 on the upstream side of the carry-in path 51 and conveyed.
In accordance with the steps shown in the flowchart of FIG. 21, the can body C is subjected to a tapping test, tapping sounds are detected from all of the 24 cans C stored in the storage means S, and the frequency for each tapping sound is detected. Analysis was performed.

The result of this frequency analysis is shown in FIG.
The figure is a graph showing the result of frequency analysis for one can C selected from 24 cans C. FIG. Similar to FIG. 22, the horizontal axis indicates the frequency, and the vertical axis indicates the acoustic level (sound pressure value) of the tapping sound.
As shown in the figure, in this frequency distribution, a peak value was measured in the vicinity of 3.0 kHz, and a peak value was also measured in the vicinity of 4.2 kHz and 4.7 kHz.

Further, the inventor prepared a plurality of can bodies C having different internal pressures, stored the plurality of can bodies C in the storage means S, and performed a test according to the steps shown in the flowchart of FIG.
The percussion sound is detected from all of the can bodies C stored in the storage means S, the frequency analysis is performed for each percussion sound, and the measured percussion sounds of all the plurality of can bodies C having different internal pressures are analyzed. Based on the frequency, the relationship between internal pressure and digit was graphed.

This graph is shown in FIG.
As shown in the figure, there was a variation in digits at one internal pressure, and there was a variation in digits at any internal pressure regardless of the size of the internal pressure.
From this result, it was found that when the inspection is performed without using the pressing member 41, a plurality of peak values appear in the frequency distribution, and the accuracy of the quality determination of the can body C is lowered.

  As described above, according to the inspection device and inspection method of the present embodiment, the conveying device is provided with a pressing member as the primary vibration suppressing means, and the bottom plate portion of the storage means in which the can body is stored is pressed upward. By bringing the inner surface of the bottom plate portion into contact with the can lid of the can body, it is possible to suppress the primary vibration generated in the can lid of the can body. Thereby, the defective product detection accuracy of a can can be improved.

Further, the percussion testing apparatus and percussion testing method of the present embodiment have the following effects in comparison with the technique described in Patent Document 1.
The internal pressure inspection apparatus described in Patent Document 1 includes a large number of pressing bodies that press the outer peripheral edge of the bottom of the can body. For this reason, the configuration of the apparatus is complicated.
On the other hand, the percussion inspection apparatus of this embodiment is provided with only one pressing member for one can body, and thus the configuration is simplified.
Moreover, while having a very simple configuration with only one pressing member in this way, the same effect as the pressing body of the internal pressure inspection apparatus described in Patent Document 1 is achieved. That is, when the pressing member of the present invention presses the bottom plate portion of the storage means, and the inner surface of the bottom plate portion is brought into contact with the can lid of the can body, the primary vibration generated in the can bottom of the can body causes the can body and the can. Propagation to the lid can be suppressed. For this reason, the peak frequency measured by the frequency analysis unit of the arithmetic unit is only the frequency of the percussion sound generated at the bottom of the can, and the peak is not measured in other frequency bands. Can be improved.

Furthermore, the percussion testing apparatus and percussion testing method of the present embodiment have the following effects in comparison with the technique described in Patent Document 1.
In the internal pressure inspection apparatus described in Patent Document 1, the pressing body is positioned above the storage means, and the pressing body gets over the front upper portion of the storage means as the storage means moves. Although the upper surface is pressed down, it is difficult to actually realize this operation with the pressing body and the spring.
On the other hand, in the inspection device of the present embodiment, the pressing member is positioned below the storage means, and the storage means conveyed by the conveying device moves while getting over the pressing member.
For this reason, the pressing member can easily reach the lower part of the can body accommodated in the accommodating means, and the bottom plate portion of the accommodating means is surely pressed upward, so that the inner surface of the bottom plate portion can be Can be contacted.

  In addition, about the comparison with the percussion apparatus and percussion method of this embodiment, and the technique of patent document 2, it is the same as that of the percussion apparatus and percussion method of 1st embodiment mentioned above, and patent document 2. Therefore, the description here is omitted.

[Third embodiment]
Next, a third embodiment of the percussion apparatus and percussion method of the present invention will be described with reference to FIGS. 26 (i) and (ii).
FIG. 26 (i) is a cross-sectional view of the storage means provided with the pressing member as the primary vibration suppression means, and (ii) is an enlarged view of the main part of the storage means shown in (i) (enlargement of the lower part of the can body). Figure).
The present embodiment is different from the second embodiment described above in the configuration of the primary vibration suppression means. That is, in the second embodiment, the primary vibration suppression means is pressed upward from below the bottom plate portion of the storage means, and the inner surface of the bottom plate portion is brought into contact with the can lid of the can body. Then, the primary vibration suppression means is formed inside the storage means and is different in that it is brought into contact with the can lid of the can body, and the other components are the same as in the second embodiment.
Therefore, the same components as those in the second embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the primary vibration suppression means 40 is disposed on the inner surface S2 of the bottom plate portion S1 of the storage means S as shown in FIGS. 26 (i) and (ii), and the can is stored in the storage means S. The pressing member 44 is in direct contact with the C can lid C3. By this contact, the pressing member 44 suppresses primary vibration generated in the can lid C3.

The pressing member 44 is disposed on the inner surface S2 of the bottom plate portion S1 of the storage means S at a position facing the can lid C3 of the can body C stored in the storage means S.
Specifically, the pressing member 44 is disposed at a position facing the central portion of the can lid C3 of the can body C (see FIGS. 26 (i) and (ii)). Further, the pressing member 44 is located at a position facing a portion other than the central portion of the can lid C3 of the can body C, for example, a position facing the portion where the tab C8 is not provided in the top surface portion C4 of the can lid C3, or , Can be disposed at a position facing the peripheral portion of the top surface portion C4.
In this way, the pressing member 44 is disposed at a position that can face the can lid C3 of the can body C when the inverted can body C is placed on the inner surface S2 of the bottom plate portion S1 of the storage means S. .

The shape of the pressing member 44 may be any shape that can contact the can lid C3 of the can body C. For example, a disk shape, a roll shape, a columnar shape, a cylindrical shape, a prismatic shape, a rectangular tube shape, a cubic shape, a rectangular parallelepiped shape. Shape, shell shape, mountain shape, arch shape, sloped arch shape, and the like.
In addition, the size of the pressing member 44 is set to a size that fits in the lid-side space C7 of the can body C.

The protruding height T3 of the pressing member 44 is, for example, when the pressing member 44 is brought into contact with the tab C8 provided on the can lid C3 of the can body C, the protruding height T3 of the pressing member 44 is the can body C. The height is equal to or higher than the height C71 of the lid side space C7 minus the thickness of the tab C8. Accordingly, the upper portion of the pressing member 44 is brought into contact with the tab C8 attached to the can lid C3 of the can body C stored in an inverted state on the inner surface S2 of the bottom plate portion S1 of the storage means S, and the can of the can body C The primary vibration generated at the lid C3 can be suppressed.
On the other hand, when the pressing member 44 is brought into contact with the top surface portion C4 other than the tab C8 attached to the can lid C3 of the can body C, the protruding height T3 of the pressing member 44 is the height of the lid side space C7 of the can body C. The height is the same as or higher than C71. Thereby, the upper part of the pressing member 44 is brought into contact with the top surface portion C4 of the can body C, and the primary vibration generated in the can lid C3 of the can body C can be suppressed.

  Note that the protrusion height T3 of the pressing member 44 is, as described above, the portion where the pressing member 44 contacts the can lid C3 of the can body C or the height C71 of the lid-side space C7 of the can body C. Although it is desirable to define by relationship, specifically, it can be within a range of, for example, 0.1 mm to 10.0 mm, preferably 3.0 mm to 5.5 mm. The protrusion height T3 is selected in consideration of the can body diameter, the can lid diameter, or the configuration on the top surface C4 side of the can lid C3 (the shape of the tab C8, the shape of the top surface C4). .

  As the material constituting the pressing member 44, for example, synthetic resin, hard rubber, metal, or the like can be used as in the pressing member 41 of the first embodiment. However, as a material constituting the pressing member 44, the pressing member 41 can be processed into a desired shape, has a predetermined hardness and wear resistance, and has a top of the can lid C3 of the can body C. It is desirable that the surface portion C4 and the tab C8 are not damaged.

The pressing member 44 may be deformed by receiving a pressure from the can lid C3 of the can body C when the can body C is placed on the inner surface S2 of the bottom plate portion S1 of the storage means S. .
In this case, since the pressing member 44 is deformed according to the outer shape of the top surface portion C4 and the tab C8 of the can lid C3, the area closely contacting the top surface portion C4 and the tab C8 is widened, and the vibration generated in the can lid C3 is reliably ensured. Can be suppressed.

  As described above, according to the percussion apparatus and percussion method of the present embodiment, the pressing member of the primary vibration suppression means is disposed on the inner surface of the bottom plate portion of the storage means and is brought into direct contact with the can lid of the can body. The primary vibration generated in the can lid can be suppressed by pressing the can. Thereby, the defective product detection accuracy of a can can be improved.

  For comparison between the percussion apparatus and percussion method of the present embodiment and the techniques described in Patent Documents 1 and 2, the percussion apparatus and percussion method of the second embodiment described above and Patent Documents 1 and 2 Since it is the same, description here is abbreviate | omitted.

  The preferred embodiments of the percussion device and percussion method of the present invention have been described above. However, the percussion device 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 each of the above-described embodiments, the pressing member is exemplified as the primary vibration suppressing unit. However, the primary vibration suppressing unit is not limited to the pressing member, and a certain force is applied to the can lid by electromagnetic action. It may be an electromagnetic restraining means that generates an electromagnetic force and suppresses primary vibration generated in the can lid.

  In the first embodiment described above, when the can body is positioned above the opening of the placement member, the pressing member is moved upward, and this pressing member is placed on the top surface portion of the can lid of the can body. It can be made to contact.

  INDUSTRIAL APPLICABILITY The present invention can be used for an apparatus or a device that performs a punch inspection of a can body that is filled and sealed with contents such as beverages.

DESCRIPTION OF SYMBOLS 1 Tapping device 10 Tapping head 20 Arithmetic device 40 Primary vibration suppression means 41 Pressing member 413 Convex part 44 Pressing member 50 Conveying device 60 Rotating body 61 Roller 62 Conveyor C Can body C3 Can lid C4 Top surface portion C7 Cover side space S Storage Means K1 First virtual plane K2 Second virtual plane

Claims (13)

A tapping head that gives electromagnetic shock to the can body, receives a tapping sound emitted from a tapping vibration portion of the can body, converts the tapping sound into a tapping signal, and outputs the tapping signal. Analyzing device comprising a computing device for analyzing and determining the can internal pressure of the can body,
A percussion inspection device comprising primary vibration suppression means for suppressing primary vibration generated in the can lid of the can body when the electromagnetic shock is applied. The percussion inspection apparatus according to claim 1, wherein the primary vibration suppression unit is a pressing member that directly or indirectly presses the can lid and suppresses primary vibration generated in the can lid. The said pressing member is arrange | positioned in the location which can be directly contacted to the can lid of the said can body from the downward direction of the can body mounted in the inverted state on the upper surface of the mounting member. Percussion equipment. The upper part of the pressing member protrudes upward from the upper surface of the mounted member,
The percussion inspection device according to claim 3, wherein a height of the upper portion of the pressing member in a protruding direction is in a range of 0.1 mm to 10.0 mm with respect to a mounting surface of the mounting member. . The can is stored in a storage means;
The pressing member presses the storage means, and the storage means is brought into contact with the can lid to indirectly press the can lid, thereby suppressing primary vibration generated in the can lid. Item 3. The percussion apparatus according to item 2. The said pressing member is arrange | positioned in the position where the lower part of the said pressing member is located below the mounting surface of a carrying-in path, and the upper part of the said pressing member protrudes upwards from the said mounting surface. Item 5. The inspection device according to item 5. The inspection device according to claim 6, wherein a height of the upper portion of the pressing member in a protruding direction is in a range of 0.1 mm to 10.0 mm with respect to a placement surface of the conveyance path. The storage means is movable on the mounting surface;
The pressing member has a curved surface at least at an upper portion;
The curved surface has a shape obtained by curving a rectangular plane, and two opposite sides of the rectangular plane are parallel to each other, and the other two sides are curved while maintaining this parallel. And
When the line that is parallel to the opposite two sides that are kept parallel is drawn to the top of the curved surface, the direction orthogonal to the line and the direction that faces the horizontal direction is the top orthogonal direction. The percussion inspection device according to claim 6 or 7, wherein the pressing member is arranged so as to be in the same direction as the moving direction of the storage means. The storage means is movable on the mounting surface;
The pressing member is a rotary type that rotates about a horizontal axis;
When the direction in which the upper end of the pressing member moves when the rotary pressing member rotates is defined as the upper end rotating direction, the upper end rotating direction is the same as the moving direction of the storage means. The pressing device according to claim 6 or 7, wherein the pressing member is arranged. Having a plurality of convex portions on the circumferential surface of the rotary pressing member;
The interval between the plurality of convex portions is an integral part of the interval between the centers of the can lids of two can bodies arranged in the same direction as the direction in which the storage means moves among the plurality of can bodies stored in the storage means. The percussion inspection device according to claim 9, wherein the percussion inspection device has the same length as that of the one. The can is stored in a storage means;
The said pressing member is arrange | positioned at the inner surface of the baseplate part of the said storage means, The primary vibration which arises in the said can lid is suppressed by making the said pressing member contact the can lid of a can body. Item 3. The percussion apparatus according to item 2. The punching device according to claim 11, wherein the pressing member has a height from an inner surface of a bottom plate portion of the storage means within a range of 0.1 mm to 10.0 mm. Applying electromagnetic shock to the can body;
A tap sound receiving step for receiving a tap sound emitted from the tap vibration unit of the can body;
Converting the percussion sound into a percussion signal and outputting it;
Analyzing the punching signal and determining a can internal pressure of the can body,
The percussion sound receiving step emits the primary vibration generated in the can lid of the can body from the percussion vibration section of the can body while being suppressed by the primary vibration suppressing means when the electromagnetic shock is applied. A step of receiving a tapping sound that is received.

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