JP2012255726A - Inner pressure inspecting apparatus and inner pressure inspecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately perform an inner pressure inspection for a can filled with contents.SOLUTION: An inner pressure inspecting apparatus 1 comprises conveyance means and a sounding tester 10. The conveyance means conveys a carton case 60 packaging a plurality of cans 50 each filled and sealed with contents. The sounding tester 10 is disposed along the conveyance means, forcibly excites the cans 50 inside the carton case 60 and is configured to capture echo sound from the cans 50 in that case. At approximately the same position as a position where the sounding tester 10 is arranged in a conveyance direction, a sucker 20 is provided which sucks an upper lid part 61 of the carton case 60 and maintains the upper lid part 61 and the cans 50 in a non-contact state. At the same position in the conveyance direction of the sucker 20 or at an upstream side, an upper lid detector 40 is disposed which detects a height position of the upper lid part 61 of the carton case 60 and the sucker 20 includes a sucker height adjusting mechanism 30 which adjusts a height position of the sucker 20 in accordance with a measurement by the upper lid detector 40.

Description

  The present invention relates to an internal pressure inspection device and an internal pressure inspection method suitable for inspecting the internal pressure of a can accommodated in a carton case.

  Traditionally, low-acid beverages such as coffee with milk are filled in aluminum positive pressure cans (filled with liquid nitrogen) or steel negative pressure cans, sealed and sterilized by retort, and then put into a carton case made of corrugated paper. Packed and loaded on pallet. The case-packed cans are allowed to stand for about 7 days, and then a can internal pressure test is performed for each carton case by a so-called percussion test to check for leaks. This is because if there is a fine pinhole in the can, it will cause a slow leak, so even if the internal pressure of the can is measured immediately after filling, the internal pressure of the can will not change much before filling, and there will be no problem with the presence or absence of leakage. Because there is.

By the way, as a means for inspecting the internal pressure of the can by the above-mentioned percussion, the can filled with the contents and sealed, in a state of being in an upright posture so that a space is formed on the bottom side of the inside of the can, For example, the peak frequency and the preset can internal pressure calculated by capturing the reverberation sound from the can at this time by forcibly exciting the radial central portion of the bottom of the can by the electromagnetic induction action. A method for inspecting the internal pressure of the can based on the correlation between the value and the peak frequency is known (see, for example, Patent Document 1).
In carrying out this inspection method, a plurality of cans are packed in a carton case in the inverted posture, and the bottom of the can is forcibly excited from the outside of the carton case. The method of catching and checking the internal pressure is adopted.

By the way, the percussion inspection is generally performed after being left for several days (about 7 days) in a state where a plurality of carton cases in which cans are packed as described above are stacked, so that the grounding portion formed at the bottom of the can In some cases, the upper lid of the carton case is sunk and the inner surface of the carton case comes into contact with the surface of the bottom of the can. In this case, since the free vibration of the bottom of the can is hindered by the upper lid portion of the carton case, it may be difficult to perform a highly accurate internal pressure test.
As a means for solving this problem, when performing the percussion, the upper lid of the carton case is sucked with a vacuum pad in advance to release the squeezed state, so that the bottom of the can and the inner surface of the carton case are removed. A method is known in which the non-contact state is performed and then the percussion is performed (see, for example, Patent Documents 2 and 3).

  For example, as shown in Patent Document 4, the internal pressure inspection of a bottle can with a cap is performed by packing the bottle can with a cap in an upright posture and packing it in a carton case, and the cap of the bottle can with a cap from the outside of the carton case. This is done by forcibly exciting the top surface and capturing the reverberation at this time. Even in such a bottle can with a cap, since the cap top surface portion may come into contact with the upper lid portion of the carton case, the upper lid portion of the carton case needs to be sucked by the vacuum pad and pulled away from the cap top surface portion.

JP 49-34376 Japanese Patent Laid-Open No. 10-246681 Japanese Patent Laid-Open No. 11-94685 JP 2006-38826 A

  By the way, in the carton case to be conveyed, the height position of the upper lid portion may fluctuate greatly, and the upper lid portion may not be sucked by the vacuum pad. In this case, since the inspection is performed in a state where the upper lid portion and the can are in contact with each other, there is a problem that the internal pressure inspection cannot be performed with high accuracy.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the internal pressure test | inspection apparatus and the internal pressure test | inspection method which can test | inspect the internal pressure of the can accommodated in the carton case with high precision.

In order to solve the above-described problems and achieve such an object, the present invention proposes the following means.
An internal pressure inspection apparatus according to the present invention includes a conveying means that conveys a carton case in which a plurality of cans filled and sealed with contents are packed, and a forcible excitation of the can in the carton case that is disposed along the conveying means. And an internal pressure inspection device comprising a percussion instrument configured to capture reverberation from the can at this time, and substantially at the same position as the disposition position of the percussion instrument in the transport direction, A suction device for sucking the upper lid portion of the carton case and maintaining the upper lid portion and the can in a non-contact state is provided, and the carton is disposed at the same position or upstream in the transport direction of the suction device. An upper lid detector for detecting the height position of the upper lid portion of the case is disposed, and the suction device adjusts the height position of the suction device according to a measurement value by the upper lid detector. A height adjustment mechanism is provided. And wherein the door.

  In this internal pressure inspection device, the height of the upper lid of the carton case is detected by the upper lid detector disposed at the same position or upstream in the transport direction of the aspirator, and the height of the aspirator is determined according to the height of the upper lid. Since the height position can be adjusted, the upper lid portion can be reliably sucked by the suction device even when the height position of the upper lid portion changes greatly. Therefore, the can can be inspected with the can for inspecting the internal pressure and the upper lid portion of the carton case in a non-contact state, and the internal pressure can be inspected with high accuracy.

Here, the aspirator is respectively disposed on the upstream side and the downstream side in the transport direction of the percussion machine, and the suction device on the upstream side in the transport direction and the suction device on the downstream side in the transport direction are separately provided. It is preferable that the height position of the suction device is adjusted independently.
In this case, since the suction device is disposed on the upstream side in the transport direction and the downstream side in the transport direction of the percussion machine, the upper lid portion is located at the position of the percussion machine by sucking the upper lid portion by these suction parts. And the can can be reliably prevented. In addition, since the suction position on the upstream side in the transport direction and the suction position on the downstream side in the transport direction can be adjusted independently of each other, the height position of the suction device can be adjusted separately. Can be reliably sucked. Even if the upper cover of the carton case to be transported protrudes largely upward, the height position of the upper cover can be adjusted by the suction part arranged on the upstream side in the transport direction of the percussion machine. Collision between the machine and the upper lid can be prevented.

Further, the suction device on the upstream side in the transport direction and the downstream in the transport direction in a state where the top cover portion is sucked so that the height distance between the percussion machine and the upper cover portion of the carton case is within a predetermined range. It is preferable to provide an upper lid height control unit that independently controls the height position of the suction device on the side.
In this case, by separately controlling the height positions of the suction device on the upstream side in the transport direction and the suction device on the downstream side in the transport direction in the state in which the upper lid portion is sucked, the inspection machine and the carton case Since the height distance from the upper lid can be adjusted to be within a predetermined range, it is possible to stably obtain an acoustic signal by percussion and to perform an internal pressure inspection with high accuracy. .

Further, the upper lid part height control unit is configured to suck the upper lid part in the state where the upper lid part is sucked so that the upper lid part of the carton case faces the horizontal direction at the position of the percussion machine, It is preferable that the height position of the suction device on the downstream side in the transport direction is separately controlled separately.
In this case, the echo sound can be collected efficiently by the percussion machine, and the internal pressure inspection of the can can be performed with high accuracy.

The internal pressure inspection method of the present invention is an internal pressure inspection method using the above-described internal pressure inspection device, and the height of the suction device is determined according to the height position of the upper lid portion of the carton case measured by the upper lid detector. The position is adjusted, and the can in the carton case is forcibly excited by the percussion machine in a state where the upper lid and the can are maintained in a non-contact state by the suction device. It is characterized by capturing the reverberation sound.
According to the internal pressure inspection method of this configuration, even if the height position of the upper lid portion of the carton case changes greatly, the upper lid portion can be reliably sucked with the suction device, and the can and the carton case for inspecting the internal pressure It is possible to carry out a percussion test with the upper lid portion in a non-contact state.

  According to the internal pressure inspection device and the internal pressure inspection method according to the present invention, the internal pressure inspection of the can accommodated in the carton case can be performed with high accuracy.

It is a schematic block diagram of the internal pressure test | inspection apparatus which is embodiment of this invention. It is an expanded sectional view of the carton case and can shown in FIG. It is an expanded sectional view which shows the suction part of the internal pressure test | inspection apparatus shown in FIG. 1, and the periphery of a percussion machine. It is a graph which shows the relationship between the height distance of the lower end and upper cover part of a percussion machine in the internal pressure test | inspection apparatus shown in FIG. 1, and the intensity | strength of the acoustic signal at the time of percussion.

Hereinafter, preferred embodiments of an internal pressure inspection device and an internal pressure inspection method according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing an embodiment of an internal pressure inspection apparatus according to the present invention.
The internal pressure inspection device 1 is configured to include a carry-in path 2, an internal pressure test means 3, a discharge section 4, a carry-out path 5, a discharge path 6, a control means 7, and an aspirator 20. Yes.

  The carry-in path 2, the carry-out path 5, and the discharge path 6 are each formed by a conveyor that circulates an endless belt 9 by a drive motor (not shown), for example. In the illustrated example, the carry-in path 2 and the carry-out path 5 have the upper surface of the endless belt 9 moved from the left side to the right side in the figure, and the discharge path 6 has the upper surface of the endless belt 9 from the upper side to the lower side in the figure. Moved to.

  The evacuation unit 4 has a schematic configuration including a conveyance path on which the carton case 60 is arranged and conveyed, and an unillustrated evacuation drive unit, and the evacuation drive unit is constituted by, for example, an air cylinder, with respect to the conveyance path. It is a structure that is supported so that it can move forward and backward. Then, in the process in which the carton case 60 is transported on the transport path, when it is determined that the internal pressure value in the carton case 60 is outside the proper range as will be described later, the waste drive unit is driven forward. As a result, the carton case 60 is moved to the discharge path 6.

  A carton case 60 made of, for example, corrugated paper is placed on the upstream side of the carry-in path 2 in the transport direction. In the carton case 60, for example, six bottle cans 50 with caps filled and sealed with products (contents) of a low acid beverage such as coffee with milk cross in the direction of conveyance in the illustrated example. A total of 24 are accommodated in the direction, that is, 4 rows and 6 columns. In general, when these cans are positive pressure cans, they are filled with liquid nitrogen, and when the contents are low acid beverages, they are filled with nitrogen gas.

Here, the bottle can 50 with a cap as an internal pressure test object in this embodiment is demonstrated using FIG.
As shown in FIG. 2, the bottle can 50 with a cap has a schematic configuration including a bottle can 51 and a cap 56. The bottle can 51 and the cap 56 are made of aluminum, an aluminum alloy, or steel. .
In the present embodiment, the bottle can 51 is formed by subjecting the plate-like body made of the metal to drawing and ironing to form a bottomed cylindrical body, and then a neck at the opening of the bottomed cylindrical body. It is formed by performing in machining, thread cutting, and curl forming.

  The bottle can 51 is connected to a large-diameter body portion 52 and a connecting portion 53 having a convex curved surface projecting radially outward at the upper end of the body portion 52 in the can axis direction. The shoulder portion 54 is gradually reduced in diameter as it goes upward in the axial direction, and has a general configuration including a base portion 55 that extends continuously upward in the can axis direction and is connected to the upper end portion of the shoulder portion 54 in the can axis direction. ing. A male screw part 55a is formed on the base part 55, and a curl part 55b is formed at the upper end in the can axis direction, which is turned back radially outward.

The cap 56 is disposed inside the cap top surface portion 57, a cap top surface portion 57 (forced excitation portion) that is a flat surface, a side surface portion 58 that substantially hangs down from the outer peripheral edge of the cap top surface portion 57, and the cap top surface portion 57. And a liner 59. In addition, the outer diameter of the side part 58 of the cap 56 is set to 28 mm or more and 42 mm or less, for example.
The cap 56 is screwed to the male thread portion 55 a of the cap portion 55 of the bottle can 51 in a state where the liner 59 of the cap 56 is in close contact with the upper end portion of the curled portion 55 b of the cap portion 55.

All bottled cans 50 with caps configured as described above are accommodated in an upright posture in the carton case 60 so that a space 51a is formed inside the cap portion 55 side. In this upright posture, in the present embodiment, until the above-described contents reach the upper position in the can axis direction from the connecting portion 53 of the bottle can 51, the can shaft of the shoulder portion 54 in the present embodiment. Filled up to the top of the direction.
At this time, as shown in FIG. 2, the cap top surface portion 57 of the bottle can with cap 50 is positioned so as to face the upper lid portion 61 of the carton case 60.

As shown in FIG. 1, the internal pressure inspecting means 3 is disposed in the downstream area of the carry-in path 2, and all the bottled cans with caps in the carton case 60 are in a state where the carton case 60 is being transported. 50 internal pressures can be inspected sequentially.
As shown in FIG. 3, the internal pressure inspection means 3 includes a vibration coil 11 that forcibly excites the central portion in the radial direction of the cap top surface portion 57, and a microphone that captures reverberation sound from the cap top surface portion 57 by the vibration coil 11. An inspection machine 10 having 12 is provided. The four inspection machines 10 are continuously arranged in a direction intersecting the conveyance direction. In FIG. 1, the inspection machines 10 are arranged so as to be shifted from each other in the conveyance direction from the upstream side to the downstream side. . That is, the connecting direction of the percussion machine 10 (the direction in which the plurality of percussion machines 10 are arranged) and the direction orthogonal to the transport direction have a predetermined angle, and the microphone 12 It is determined by, for example, the conveyance speed of the carton case 60, the material and size of the cap 56, and the like so as not to pick up the reverberation from the cap top surface portion 57 of the bottle can with cap 50 located next to it. The

  The echo sound of the cap top surface portion 57 obtained by the microphone 12 of the internal pressure inspection means 3 is transmitted to the control means 7 shown in FIG. 1, and the internal pressure value of the bottle can with cap 50 is calculated by the calculation part 7a of this control means 7. Then, the internal pressure value is transmitted to the pass / fail determination unit 7b, and the pass / fail determination unit 7b determines whether the internal pressure value of the bottle can with cap 50 is appropriate. Then, the determination result is transmitted to the evacuation control unit 7c, where an evacuation driving unit (not shown) disposed in the evacuation unit 4 is controlled. That is, when the pass / fail determination unit 7b determines that the internal pressure values of all the bottled cans 50 with caps in the carton case 60 are appropriate, the waste drive unit is not driven, and the carton case 60 is conveyed by the carry-in path 2. If the internal pressure value is determined to be inappropriate for any one of the bottled cans 50 with caps in the carton case 60, the evacuation drive unit is Driven, the carton case 60 is moved onto the discharge path 6 and discharged.

The computing unit 7a calculates, for example, a peak frequency from the reverberation sound obtained by the microphone 12, and the bottle can with cap 50 based on the peak frequency and a correlation between a preset can internal pressure value and the peak frequency. The internal pressure value is calculated.
The pass / fail determination unit 7b compares the internal pressure value calculated by the calculation unit 7a with a preset appropriate internal pressure value, and fails if the calculated internal pressure value is not within the range of the appropriate internal pressure value. If it is within this range, it is determined that it is acceptable.

  As shown in FIG. 1, the aspirator 20 is disposed above the surface of the carry-in path 2 at substantially the same position as the placement position of the inspection machine 10 in the transport direction. In the present embodiment, a suction device 20a disposed on the upstream side in the transport direction and a suction device 20b disposed on the downstream side in the transport direction are provided with respect to the placement position of the inspection machine 10. That is, the suction devices 20 are disposed on the upstream and downstream sides in the transport direction of the percussion machine 10 in each of the four percussion machines 10 arranged in a direction intersecting the transport direction. Two suction devices 20 are provided.

  As shown in FIG. 3, the aspirator 20 supports a shaft portion 21 extending along an axis O extending vertically, a vacuum pad 23 provided at the lower end of the shaft portion 21, and an upper end portion of the shaft portion 21. And a height adjusting mechanism 30 for adjusting the height positions of the shaft portion 21, the vacuum pad 23, and the upper end support member 26.

The shaft portion 21 is provided with a suction passage portion 22 extending along the direction of the axis O, and the upper end of the suction passage portion 22 is connected to a vacuum exhaust means (not shown).
Further, a sleeve 27 fixed to the gantry 29 is externally fitted to the shaft portion 21, and the shaft portion 21 is movable in the vertical direction with respect to the sleeve 27.
Furthermore, the upper end support member 26 that supports the upper end of the shaft portion 21 supports the shaft portion 21 so as not to move relative to the shaft portion 21 in the direction of the axis O, and a male screw is formed on the outer peripheral surface thereof. Yes.

A suction port 25 is provided at the distal end surface 24 of the vacuum pad 23 provided at the lower end of the shaft portion 21, and the distal end surface 24 is a holding surface of the upper lid portion 61 of the carton case 60.
Each vacuum pad 23 is formed in a disk shape from a synthetic resin obtained by polymerizing polytetrafluoroethylene, for example, as a resin material having a relatively high hardness and a small friction coefficient. 24 has a structure in which a large-diameter hole is formed, and a suction port 25 is disposed at the radial center of the bottom surface of the hole. Further, the outer peripheral surface of the distal end portion 24 of the vacuum pad 23 has a tapered shape that is gradually reduced in diameter toward the distal end surface 24.

The height adjusting mechanism 30 includes an inner shaft 31 disposed on the outer peripheral side of the sleeve 27, a rotating member 32 disposed on the outer peripheral side of the inner shaft 31 and the upper end support member 26, and an outer periphery of the rotating member 32. The first timing pulley 33 disposed on the surface, the stepping motor 34, the second timing pulley 35 disposed on the rotation shaft of the stepping motor 34, and the first timing pulley 33 and the second timing pulley 35 are hung. A passed timing belt 36 and a motor control unit 38 for controlling the operation of the stepping motor 34 are provided.
A female screw is formed on the inner peripheral surface of the rotating member 32 and is configured to be screwed with a male screw formed on the outer peripheral surface of the upper end support member 26.
The inner shaft 31 is fixed to the sleeve 27 by a pin member. A bearing member 37 is disposed between the outer peripheral surface of the inner shaft 31 and the inner peripheral surface of the rotating member 32.

Here, when the rotating shaft of the stepping motor 34 is rotated, the rotation of the second timing pulley 35 is transmitted to the first timing pulley 33 through the timing belt 36, and the rotating member 32 rotates about the axis O.
The rotation member 32 is restricted from moving in the direction of the axis O. When the rotation member 32 rotates, the upper end support member 26 moves in the direction of the axis O. Thereby, the shaft part 21 and the vacuum pad 23 supported by the upper end support member 26 move in the direction of the axis O.
The operation of the stepping motor 34 is controlled by the motor control unit 38, and the height position of the vacuum pad 23 is adjusted.

Here, a laser displacement meter 40 for detecting the height position of the upper lid portion 61 of the carton case 60 being conveyed is disposed further upstream of the suction unit 20a located upstream in the conveyance direction of the percussion machine 10. Has been. In the present embodiment, a plurality (four) of laser displacement meters 40 are arranged in parallel so as to correspond to each of the percussion machines 10. The measured value of the laser displacement meter 40 is transmitted to the motor control unit 38.
Further, in the present embodiment, the motor control unit 38 gives a command to the stepping motor 34 so that the height distance h between the percussion machine 10 and the upper cover part 61 of the carton case 60 falls within a predetermined range. In the state where the portion 61 is sucked, the height position of the distal end surface 24 of the vacuum pad 23 of the suction device 20a on the upstream side in the transport direction and the suction device 20b on the downstream side in the transport direction is controlled separately.

A method for inspecting the internal pressure of the bottle can 50 with the cap using the internal pressure inspection apparatus 1 configured as described above will be described.
First, the carton case 60 is transported by the carry-in path 2, and the carton case 60 is brought to the position where the internal pressure inspection means 3 disposed along the carry-in path 2. At this time, as shown in FIG. 2, all of the bottled cans 50 with caps accommodated in the carton case 60 are formed so that a space 51 a is formed inside the caps 55 of these bottled cans 50 with caps. Erect posture.

The carton case 60 is conveyed, and the carton case 60 passes under the laser displacement meter 40 as shown in FIG. At this time, the height position of the upper cover 61 of the carton case 60 is measured by the laser displacement meter 40, and the measured value is transmitted to the motor controller 38. A command is given from the motor control unit 38 to the stepping motor 34, and the height position of the vacuum pad 23 is adjusted.
Here, when the entire front end surface 24 of the vacuum pad 23 comes into contact with the outer surface of the upper lid portion 61 of the carton case 60, air is sucked from the suction port 25 of the vacuum pad 23 through the suction passage portion 22. The upper lid 61 is sucked up together with the air sucked up from the suction port 25 and is adsorbed to the tip surface 24 of the vacuum pad 23. Thereby, the upper cover part 61 is moved upwards, and the cap top surface part 57 and the upper cover part 61 of the bottle can 50 with a cap will be in a non-contact state.

Next, the carton case 60 is conveyed while maintaining the non-contact state. At this time, the upper lid portion 61 of the carton case 60 is sucked by the suction device 20 disposed on the downstream side of the inspection machine 10 in the transport direction.
In the present embodiment, the suction device 20a on the upstream side in the transport direction is instructed by a command from the motor control unit 38 so that the height distance h between the percussion machine 10 and the upper lid portion 61 of the carton case 60 is within a predetermined range. In addition, the height position of the vacuum pad 23 of the suction device 20b on the downstream side in the transport direction is independently controlled.

  Here, the relationship between the height distance h between the percussion machine 10 and the upper lid 61 of the carton case 60 and the intensity of the acoustic signal is shown in FIG.

Referring to FIG. 4 and Table 1, when the height distance h between the excitation coil 11 and the upper lid portion 61 of the carton case 60 is separated from 4.0 mm or close to 0.5 mm or less, the acoustic signal is transmitted. There is a possibility that an acoustic signal cannot be obtained by the microphone and the internal pressure test cannot be performed with high accuracy. On the other hand, if the height distance h between the excitation coil 11 and the upper lid 61 of the carton case 60 is in the range of 1.0 mm or more and 3.5 mm or less, the intensity of the acoustic signal is sufficiently high, and the internal pressure test is performed. It can be implemented reliably. Furthermore, when the height distance h between the excitation coil 11 and the upper lid portion 61 of the carton case 60 is set in the range of 1.5 mm or more and 2.5 mm or less, the intensity of the acoustic signal is further increased, which is preferable.
In the present embodiment, the height distance h between the percussion instrument 10 (excitation coil 11) and the upper lid portion 61 of the carton case 60 is set within a range of 1.0 mm ≦ h ≦ 3.5 mm.

  In this state, in the percussion instrument 10, the cap top surface portion 57 is forcibly excited by the electromagnetic induction action by the excitation coil 11. The echo sound from the cap top surface portion 57 at this time is captured by the microphone 12. Then, this reverberation sound is transmitted to the calculation part 7a of the control means 7, and a peak frequency is calculated by this calculation part 7a, for example. Then, the internal pressure value of the bottle can with cap 50 is calculated based on the peak frequency and the correlation between the preset can internal pressure value and the peak frequency, and then the internal pressure value is transmitted to the pass / fail judgment unit 7b. The pass / fail determination unit 7b compares the transmitted can internal pressure value with a preset proper internal pressure value, and determines whether the can internal pressure value is within the range of the proper internal pressure value.

The above-described forced excitation to determination of the can internal pressure value are performed for all bottled cans 50 with caps accommodated in the carton case 60 while the carton case 60 is conveyed in the non-contact state.
Here, when the carton case 60 is transported in the non-contact state, the carton case 60 is transported while the outer surface of the upper lid 61 slides on the front end surface 24 of the vacuum pad 23. Thereby, the non-contact state of the upper lid part 61 and the cap top surface part 57 is realized in a state where the carton case 60 is conveyed.

When it is determined that even one of the bottle cans 50 with a cap has a can internal pressure value outside the range of the appropriate internal pressure value, the discharge drive unit of the discharge unit 4 is driven, and the carton case 60 is connected to the discharge path 6. The carton case 60 is discharged from the discharge path 6.
When it is determined that the internal pressure values of all bottled cans 50 with caps accommodated in the carton case 60 are within the appropriate range, the carton case 60 is not driven and the carton case 60 is not driven. To the next process.

  As described above, according to the internal pressure inspection device 1 and the internal pressure inspection method according to the present embodiment, the height of the upper lid portion 61 of the carton case 60 is increased by the laser displacement meter 40 disposed on the upstream side in the transport direction of the suction device 20. Since the height position of the vacuum pad 23 of the suction device 20 can be detected and adjusted according to the height of the upper lid portion 61, the upper lid portion 61 is sucked even when the height position of the upper lid portion 61 changes greatly. The suction can be reliably performed by the container 20. Therefore, the bottle can with cap 50 for inspecting the internal pressure and the upper lid portion 61 of the carton case 60 can be placed in a non-contact state, and the internal pressure inspection of the can can be performed with high accuracy.

  Further, in the present embodiment, the suction devices 20a and 20b are disposed on the upstream side and the downstream side in the transport direction of the percussion machine 10, respectively, so that the upper lid portion 61 is sucked by these suction portions 20a and 20b. By doing so, it is possible to reliably prevent contact between the upper lid portion 61 and the bottle with cap 50 at the position of the percussion machine 10. Further, since the suction device 20a on the upstream side in the transport direction and the suction device 20b on the downstream side in the transport direction can be adjusted independently of each other, the height position of the vacuum pad 23 can be adjusted independently. Can be aspirated. Further, even when the upper lid portion 61 protrudes greatly upward, the height position of the upper lid portion 61 can be adjusted by the suction portion 20a disposed on the upstream side in the transport direction of the percussion device 10, and the percussion device 10 can be adjusted. And the upper lid 61 can be prevented from colliding with each other.

  Further, in the present embodiment, in response to a command from the motor control unit 38, the height distance h between the percussion machine 10 (vibration coil 11) and the upper cover 61 of the carton case 60 is within a predetermined range. Since the height positions of the vacuum pads 23 of the suction device 20a on the upstream side in the transport direction and the suction device 20b on the downstream side in the transport direction are separately controlled separately, it is possible to stably obtain an acoustic signal by percussion and to check the internal pressure Can be carried out with high accuracy. In particular, in the present embodiment, the height distance h between the percussion instrument 10 (excitation coil 11) and the upper lid portion 61 of the carton case 60 is set within a range of 1.0 mm ≦ h ≦ 3.5 mm. Therefore, the intensity of the acoustic signal is sufficiently high, and the internal pressure inspection by percussion can be performed with high accuracy.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, as a bottle can with a cap to be measured, a can having a bottom formed integrally with a body portion is shown, but a can having a configuration in which a bottom lid is wound is applicable. Moreover, not a bottle can with a cap but a normal can.
Further, the internal pressure inspection device has been described as inspecting the internal pressure by forcibly exciting the top surface of the cap. However, the present invention is not limited to this, and when the internal pressure is inspected by forcibly exciting the bottom of the can. Applicable.
However, the cap top surface portion of the bottle can with a cap is a flat surface and is located at the highest position in the can axis direction, so it is particularly easy to contact the inner surface of the upper lid portion of the carton case. Since the possibility of hindering the free vibration of the top surface of the cap is extremely high, the effect is particularly remarkable.

  Further, in the present embodiment, an example is described in which a carton case accommodates six cans in the transport direction and four cans in a direction crossing this direction, that is, a total of 24 cans in four rows and six columns. However, the present invention is not limited to this. For example, a carton case in which a total of 30 cans of 5 rows and 6 columns are accommodated may be used.

  The internal pressure of the can filled with the contents can be inspected with high accuracy and high efficiency.

1 Internal pressure inspection device 2 Carry-in path (conveying means)
10 Percussion machine 20 Aspirator 30 Height adjustment mechanism (aspirator height adjustment mechanism)
38 Motor controller (upper cover height controller)
40 Laser displacement meter (upper lid detector)
50 Bottle can with cap (can)
60 Carton case 61 Upper lid

Claims (5)

Conveying means for conveying a carton case packed with a plurality of cans filled and sealed with contents, and disposed along the conveying means, forcibly exciting the can in the carton case, and from the can at this time An internal pressure inspection device comprising a percussion machine configured to capture the reverberation sound of
A suction unit that sucks the upper lid of the carton case and maintains the upper lid and the can in a non-contact state is provided at substantially the same position as the placement position of the percussion machine in the transport direction. ,
An upper lid detector for detecting the height position of the upper lid of the carton case is disposed at the same position or upstream in the transport direction of the suction device,
2. The internal pressure inspection device according to claim 1, wherein the suction device is provided with a suction device height adjustment mechanism that adjusts a height position of the suction device in accordance with a measurement value obtained by the upper lid detection unit. The internal pressure inspection apparatus according to claim 1,
The suction devices are respectively disposed on the upstream side and the downstream side in the transport direction of the percussion machine, and the suction device on the upstream side in the transport direction and the suction device on the downstream side in the transport direction are separately provided. An internal pressure inspection apparatus, wherein a height position of the suction device is adjusted. In the internal pressure inspection apparatus according to claim 2,
The suction device on the upstream side in the transport direction and the downstream side in the transport direction in the state where the top cover portion is sucked so that the height distance between the percussion machine and the top cover portion of the carton case is within a predetermined range. An internal pressure inspection apparatus comprising an upper lid height control unit for independently controlling the height position of the suction device. In the internal pressure inspection apparatus according to claim 3,
The upper lid portion height control unit is configured to suck the upper lid portion in the state in which the upper lid portion is sucked so that the upper lid portion of the carton case faces the horizontal direction at the position of the percussion machine, and the transport direction An internal pressure inspection device, wherein the height position of the downstream suction device is independently controlled. An internal pressure inspection method using the internal pressure inspection device according to any one of claims 1 to 4,
The height position of the suction device is adjusted according to the height position of the upper lid portion of the carton case measured by the upper lid detection portion, and the upper lid portion and the can are maintained in a non-contact state by the suction device. An internal pressure inspection method characterized in that the can in the carton case is forcibly excited by the percussion machine and the reverberation sound from the can at this time is captured.

Images