JP2014085246A - Device and method for inspecting internal pressure of hermetically sealed container - Google Patents

Abstract

An object of the present invention is to accurately and easily determine whether an internal pressure is good or not by measuring the shape of a sealed container deformed in accordance with a change in internal pressure.
[Solution]
At least one of the upper end and the lower end of the body part 4 has a bottom cover 5 connected to the body part 4 by a coupling part 12, and the internal pressure of the sealed container 1 in which the bottom cover 5 is deformed by the internal pressure. In the inspection apparatus, one point on the protruding end 9 formed on the lid 5 on the center side of the bottom lid 5 with respect to the coupling portion 12 and protruding outside the sealed container 1 and another point on the protruding end 9 are A displacement sensor 13 that measures a cross-sectional shape along a straight line connecting the points on the protruding end 9 by irradiating a linear two-dimensional laser beam along the connecting straight line and receiving the reflected light, and a straight line in the cross-sectional shape And a determination means for determining the quality of the internal pressure based on the cross-sectional area as well as determining the cross-sectional area of the region partitioned by the bottom cover 5.
[Selection] Figure 1

Description

  The present invention relates to an apparatus and method for inspecting an internal pressure of a sealed container such as a three-piece can or a bottle-type can, and more particularly to an internal pressure inspection apparatus and method for a metal can.

  Containers such as cans filled with food and beverages are usually sealed in an airtight state after filling the contents. Therefore, if there are abnormalities such as pinholes, poor winding, or deterioration of the contents, the outside air In some cases, the vacuum degree of the container decreases due to the intrusion of gas or the generation of gas, or the internal pressure decreases due to leakage of the internal gas. Therefore, conventionally, the internal pressure of a sealed container such as a can filled with contents is inspected, and so-called defective products are excluded from the line. As this internal pressure inspection method, for example, as described in Patent Literature 1, Patent Literature 2, or Patent Literature 3, a striking force is applied to the sealed container to generate sound or vibration, and the frequency of the sound or vibration is analyzed. A method for detecting an abnormality in internal pressure, that is, an abnormality in a sealed container is known.

  On the other hand, recently, canned products filled with high-viscosity contents such as solid contents or corn soup have been distributed in large quantities. In this type of sealed container, the contents adhere to the inner surface of the can lid (canopy or bottom lid) to which a striking force is applied, or the solid content as its component adheres, and the amount and position thereof Not constant. Therefore, the frequency or distribution of the sound or vibration generated by the so-called percussion is different depending on the content of the contents or the solid content attached to the can lid, and the internal pressure is normal. There was an inconvenience of making this determination.

  As an inspection method or inspection apparatus that can eliminate such inconvenience, a method or apparatus that detects deformation of a container due to internal pressure has been proposed. For example, in Patent Document 4, the position of one point in the center of the can lid and two points on the winding tightening portion of the can lid are arranged above these three points. An apparatus is described that measures by an eddy current type distance sensor, calculates the deformation amount of the central portion of the can lid based on the measured value, and compares the deformation amount with a reference value to determine whether the internal pressure of the can is good or bad. Yes. Further, Patent Document 5 discloses that the top depth, which is the distance from the upper end of the can, which is carried in the carton case and conveyed by the conveyor, to the opening tab, and the bottom depth, which is the distance from the lower end to the bottom panel, are eddy currents. An apparatus is described that is configured to determine whether the internal pressure is good or not by measuring with a displacement sensor of the formula and comparing the total value of these depths with a criterion value.

Japanese Patent Publication No. 63-67845 JP-A-6-213748 JP 2002-148133 A Japanese Patent Application Laid-Open No. 8-219915 JP 2009-210451 A

  The devices described in Patent Document 4 and Patent Document 5 described above are configured to determine whether the internal pressure is good or not based on a change in the shape of the sealed container, and thus are hardly affected by the properties or types of contents. The quality of the internal pressure can be determined without receiving it. However, the apparatus described in Patent Document 4 first obtains the average distance of the tightening portion, and uses the difference between the average distance of the tightening portion and the distance between the center of the can lid as a deformation amount. Since the accuracy is not necessarily high, and the threshold value for pass / fail judgment has to be reduced, there is a possibility that a failure is judged even though the internal pressure is normal. In other words, if the deformation amount other than the central portion of the can lid increases due to the shape of the can lid or the state of processing of the surface of the can lid, the deformation amount of the central portion of the can lid becomes the largest, but from the normal state Therefore, the pass / fail judgment threshold value must be reduced.

  Moreover, in the apparatus described in patent document 5, it is necessary to arrange | position a sensor to both the upper end side and lower end side of a can, and to measure the above-mentioned top depth and bottom depth, Therefore There exists a disadvantage that an installation cost increases. . In particular, when an internal pressure inspection is performed while a can is being transported by a conveyor, a sensor for measuring the bottom depth is built into the conveyor. When an internal pressure inspection device is added to the equipment, it is necessary to modify the entire line including the conveyor, so that it is difficult to incorporate it into the existing equipment in practice.

  Furthermore, since both the device described in Patent Document 4 and the device described in Patent Document 5 measure the distance using an eddy current sensor, the distance detection accuracy or the internal pressure quality determination accuracy is improved. It was difficult. For example, the device described in Patent Document 4 is configured to measure the position of the upper end of the winding tightening portion, but the upper end is a narrow portion with a small projected area when viewed from above, On the other hand, an eddy current sensor generates eddy currents in a part of a relatively large area, and measures the distance (distance) accordingly, so it accurately measures the position or distance of the winding part. This is difficult, and this affects the determination accuracy of the internal pressure, and the determination accuracy must be lowered. In Patent Document 4, it is described that the amount of deformation of the central portion of the can lid panel is measured by measuring the position or distance of a total of three points of the central portion of the can lid panel and both sides thereof, In such an apparatus, since the deformation direction of the central portion of the can lid panel is the same as the deformation directions of the two points on both sides thereof, accurate measurement and internal pressure determination cannot be performed.

  The present invention has been made against the background of the above circumstances, and an object thereof is to provide an internal pressure inspection device and method for a sealed container that can easily and accurately determine the internal pressure using deformation of the sealed container. Is.

  In order to achieve the above object, the invention according to claim 1 includes a lid portion connected to the trunk portion by a coupling portion on at least one of the upper end portion and the lower end portion of the trunk portion, In the internal pressure inspection apparatus for a sealed container in which the lid portion is deformed by internal pressure, a point on the protruding end that is formed on the lid portion on the center side of the lid portion with respect to the coupling portion and protrudes to the outside of the sealed container; Measuring the cross-sectional shape along the straight line connecting the points of the lid by irradiating a linear two-dimensional laser beam along the straight line connecting the other points on the protruding end and receiving the reflected light And a determination means for determining a cross-sectional area of an area partitioned by the straight line and the lid portion in the cross-sectional shape and determining the quality of the internal pressure based on the cross-sectional area. Is what

  According to a second aspect of the present invention, in the first aspect of the invention, the lid portion includes an annular groove portion that is continuous with the inner peripheral side of the coupling portion and is recessed in the sealed container, and an inner periphery of the annular groove portion. A projecting end of the side inclined wall to the outside of the sealed container, and a panel portion that is a portion on the center side of the lid portion from the projecting end, and the cross-sectional area includes the straight line in the cross-sectional shape and the section An apparatus for inspecting an internal pressure of a sealed container, characterized by having a cross-sectional area of a region partitioned by a panel portion.

  According to a third aspect of the present invention, there is provided a sealing unit in which at least one of the upper end portion and the lower end portion of the trunk portion has a lid portion connected to the trunk portion by a coupling portion, and the lid portion is deformed by internal pressure. In the container internal pressure inspection method, a point on the projecting end formed on the lid unit on the center side of the lid unit with respect to the lid unit than the coupling unit, and projecting outside the sealed container, and on the projecting end Measure a cross-sectional shape along a straight line connecting the points of the lid by a displacement sensor that irradiates a linear two-dimensional laser beam along a straight line connecting another point and receives the reflected light. A method for inspecting an internal pressure of a sealed container, wherein a cross-sectional area of a region defined by the straight line and the lid portion in a shape is obtained and whether the internal pressure is good or bad is determined based on the cross-sectional area.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the lid portion includes an annular groove portion that is continuous with the inner peripheral side of the coupling portion and is recessed in the sealed container, and an inner periphery of the annular groove portion. A projecting end of the side inclined wall to the outside of the sealed container, and a panel portion that is a portion on the center side of the lid portion from the projecting end, and the cross-sectional area includes the straight line in the cross-sectional shape and the section A method for inspecting an internal pressure of a sealed container, characterized by having a cross-sectional area of an area partitioned by a panel portion.

  According to the internal pressure inspection apparatus or method for a sealed container according to the present invention, two different on the protruding end formed on the center side of the lid portion from the coupling portion connecting the lid portion to the trunk portion by the laser type displacement sensor. The shape of the lid of the container can be measured by irradiating the two-dimensional laser beam in a line including a point, and the internal pressure can be determined based on a change in the shape of the lid. For example, when transporting sealed containers on a conveyor, the shape of the lid can be measured by irradiating the lid with a two-dimensional laser beam once, so the movement of the sealed container due to the shaking affects the shape measurement of the lid. No longer. Further, even when the sealed container is inclined and relatively moved with respect to the displacement sensor, the internal pressure can be determined by measuring the shape of the lid of the sealed container in the inclined state. Furthermore, since the laser beam emitted toward the lid is linear, even if the sealed container is shifted from side to side with respect to the traveling direction on the conveyor, sealing within the laser beam irradiation range is possible. Since the shape of the lid portion of the container can be measured, such a deviation in the arrangement of the sealed container can be allowed. Therefore, the cross-sectional shape of the cross-sectional area used for determining the internal pressure of the sealed container can be accurately measured.

  In addition, by determining the internal pressure based on the cross-sectional area of the area defined by the straight line connecting the two different points on the protruding end and the lid, for example, deformation at the center of the lid is small, Even when the increase or decrease in internal pressure is absorbed by deformation, the cross-sectional area is calculated based on the change in the shape of the lid that includes the surrounding area within the shape measurement range, so that abnormal internal pressure can be reliably detected. Can be determined.

  And according to this invention, since the quality of an internal pressure can be determined by calculating the detection value of a laser type displacement sensor, the structure of an apparatus can be simplified and addition to the existing installation is easy. Furthermore, since the shape of the lid can be measured by one-time irradiation of the two-dimensional laser beam with respect to the sealed container to be subjected to the internal pressure determination, the determination processing speed can be improved and the time for the internal pressure determination step can be reduced.

It is a figure showing typically an example of an internal pressure inspection device concerning this invention. It is a schematic diagram for demonstrating the coupling | bond part of a bottom lid and a can body. It is the figure which showed typically the cross-sectional shape of the bottom cover in this specific example. It is a figure for demonstrating an example of the two-dimensional shape data of the bottom cover in this specific example, and demonstrating the area | region for calculating | requiring a cross-sectional area. It is the figure which showed typically an example of the internal pressure test process in this specific example. It is the figure which showed the measurement result showing the correlation of area data and internal pressure by this invention.

  Hereinafter, the present invention will be described based on specific examples. The present invention relates to an internal pressure inspection apparatus and method for a sealed container configured to determine whether the internal pressure of the sealed container is good or not by measuring the shape of the lid portion. A container in which a body portion filled with contents is sealed in an airtight state by a lid portion. Specifically, it is an apparatus and a method configured to determine whether the internal pressure is good or not based on the shape of the sealed container that is deformed in accordance with the change in internal pressure, particularly the shape of the lid. In this specific example, as a sealed container, a bottle type in which a bottom lid is attached to the lower end portion of the trunk portion, and a mouth neck portion having a screw portion at the upper end portion is integrally formed and a cap is screwed to the mouth neck portion. The case where this container is used as an object of the internal pressure inspection will be described. Further, the bottle-shaped container will be described as a metal can made of a metal such as aluminum, an alloy thereof, or steel.

  With reference to FIG. 1, the specific example of the internal pressure test | inspection apparatus comprised so that the internal pressure of the bottle-type can 1 might be test | inspected is demonstrated. As illustrated in FIG. 1, in this specific example, the bottle-shaped can 1 filled with the contents is placed on the conveyor 3 in an inverted state in which the cap 2 is on the lower side, and an internal pressure inspection is performed while being conveyed in that state. Is configured to do. The bottle-shaped can 1 has a bottom lid 5 attached to one end (upper end in FIG. 1) of a metal barrel 4 and the other end (lower end in FIG. 1). ) Is formed with a neck portion 11 having a threaded portion on the outer peripheral surface, and the cap 2 is screwed to the neck portion 11.

  The bottom cover 5 is formed in a substantially disk shape, and is attached to the body portion 4 by a portion (winding portion) where the flange portion 6 of the outer peripheral portion is wound around the opening end of the body portion 4. This wound portion corresponds to the coupling portion 12 in the present invention. Further, FIG. 2 schematically shows a cross-sectional view in which the coupling portion 12 illustrated in FIG. 1 is enlarged. As shown in the figure, an annular groove portion 7 called a counter sink is formed on the inner peripheral side (center side of the bottom cover 5) of the coupling portion 12 in the bottom lid 5, and the inner peripheral edge of the annular groove portion 7, that is, A panel portion 10 is formed continuously from the protruding end 9 of the inner peripheral inclined wall 8 in the annular groove portion 7 to the inner peripheral side. Accordingly, the protruding end 9 formed at the boundary portion between the panel portion 10 and the annular groove portion 7 formed in a cross-sectional shape that is recessed inward of the container is directed toward the outside of the container (upper side in FIG. 1). It is formed to protrude. The bottom lid 5 corresponds to the lid portion in the present invention.

  Furthermore, as illustrated in FIG. 3, the panel portion 10 in this specific example is bent in a dome shape toward the inside of the bottle-type can 1 with the protruding end 9 as a starting point. That is, the bottle-type can 1 in the illustrated example is configured as a negative pressure container whose internal pressure is lower than atmospheric pressure. FIG. 3 schematically shows a cross-sectional shape along a straight line on the diameter of the bottom lid 5 constituting the bottle-shaped can 1, and a straight line connecting two points on the protruding end 9 that face each other on the diameter. (Line segment) is indicated by a two-dot chain line, and a curved contour line along the surface shape (indented shape) of the panel portion 10 having a shape recessed inward of the bottle-shaped can 1 starting from the straight line and the protruding end 9 A region A divided by the cross-sectional area is indicated by hatching as a cross-sectional area (hereinafter referred to as cross-sectional area A). Therefore, the size of the cross-sectional area A changes as the panel portion 10 is deformed in accordance with the change in internal pressure.

  The conveyor 3 continuously conveys the bottle-shaped cans 1 in an inverted state, and for example, a belt conveyor can be adopted. The conveyance speed can be set as appropriate, and may be, for example, about 70 m / min. A rotary encoder (not shown) is attached to the driving side or driven side roller or driving motor shaft of the conveyor 3, and the rotary encoder can detect the traveling speed and the traveling position of the conveyor 3. . Therefore, it is comprised so that the bottle-type can 1 on the conveyor 3 can be specified based on the traveling position information.

  A laser displacement sensor (hereinafter simply referred to as a displacement sensor) is located above the conveyor 3 and above the pass line (passing position) of the bottom lid 5 in the bottle-shaped can 1 that is placed and conveyed on the conveyor 3 in an inverted state. ) 13 is arranged. The displacement sensor 13 irradiates the bottom lid 5 of the bottle-shaped can 1 being conveyed by the conveyor 3 with a laser beam spread in a linear or belt shape, receives the reflected light, and receives the reflected light from the bottom lid 5. It is a so-called two-dimensional laser displacement sensor having a known configuration configured to measure a dimensional shape. As an example of the displacement sensor 13, the bottom cover 5 is irradiated with a laser beam that is changed only in one axial direction with respect to incident light and is transmitted through a cylindrical lens that is a linear (band-like) laser beam at the focal point. By receiving the reflected light diffusely reflected by the irradiated portion (the surface of the bottom cover 5), the received light amount data (position data) is obtained. The position data is output to the controller 15. Further, the displacement sensor 13 is positioned at a position where the laser beam is irradiated on a straight line passing through the center of the bottom lid 5, that is, on a straight line along the diameter direction of the bottom lid 5 by passing the bottle-shaped can 1 below. Has been placed.

  Furthermore, a timing sensor that detects that the bottle-type can 1 has reached the internal pressure inspection start position is disposed above the conveyor 3. A photoelectric sensor 14 that detects the bottle-shaped can 1 in a non-contact manner is disposed on the side of the region through which the body portion 4 passes, and the bottle-shaped can 1 starts an internal pressure test when the bottle-shaped can 1 blocks the irradiated light. It is configured to detect that the position has been reached and to output a detection signal to the controller 15. The relative position between the photoelectric sensor 14 and the displacement sensor 13 is a position where the body portion 4 first blocks the irradiation light of the photoelectric sensor 14 and includes a two-dimensional laser so as to include the central portion of the panel portion 10 in the bottle-shaped can 1. It is set at the position where the beam is irradiated. In other words, the photoelectric sensor 14 is configured to measure the two-dimensional shape of the bottom lid 5 of the bottle-type can 1 at the same time that the bottle-type can 1 is detected. The bottle type can 1 on the conveyor 3 can be specified by the detection signal of the photoelectric sensor 14 and the detection signal of the rotary encoder.

  The rotary encoder and displacement sensor 13 and the photoelectric sensor 14 are connected to the controller 15. The controller 15 is mainly composed of a microcomputer, and outputs a control signal to the rotary encoder, the displacement sensor 13 and the photoelectric sensor 14, receives a detection signal, and performs a predetermined calculation based on the detection signal. And determining whether the internal pressure of each bottle-type can 1 is good or not, and specifying the bottle-type can 1 that has been determined to have poor internal pressure. The contents of the control, that is, the internal pressure inspection method according to the present invention will be described below.

  The bottle-type cans 1 that are the targets of the internal pressure inspection are continuously placed on the conveyor 3 in the inverted state shown in FIG. 1, and are conveyed by the conveyor 3 with a predetermined interval between the bottle-type cans 1. . For example, as illustrated in FIG. 5, when a predetermined bottle-shaped can 1 on the conveyor 3 advances to the installation position of the photoelectric sensor 14, a linear two-dimensional line is formed with respect to one bottle-shaped can 1 by the displacement sensor 13. The shape of the bottom cover 5 is measured by irradiating the laser beam once and receiving the reflected light. Specifically, the displacement sensor 13 outputs a laser pulse once based on a detection signal from the photoelectric sensor 14 to receive reflected light from a linear irradiated portion (a surface including the central portion of the panel unit 10). Thus, the shape of the bottom lid 5 is measured based on the amount of received reflected light. The displacement sensor 13 acquires the position data of the irradiated portion based on the amount of received reflected light, the position data acquired by the displacement sensor 13 is output to the controller 15, and the position data is two-dimensionally displayed by the controller 15. You may be comprised so that it may convert into shape data.

  Then, the controller 15 uses the measured two-dimensional shape data of the bottom lid 5 so as to obtain a cross-sectional area in a predetermined range for determining whether the internal pressure is good or not based on a change in the shape of the bottom lid 5. It is configured. In addition, a reference point for specifying the predetermined range is set. Specifically, while setting two different points on the inner circumference side of the engaging portion 12 in the two-dimensional shape data as reference points, setting a straight line connecting one reference point and the other reference point, The sectional area of the region defined by the straight line and the bottom lid 5 in the sectional shape is obtained. In this specific example, as described above, since the panel portion 10 is formed in a dome-shaped shape starting from the protruding end 9, the location indicating the protruding end 9 in the two-dimensional shape data is set as the reference point. It is configured.

  The reference points only need to be predetermined locations on the inner peripheral side of the coupling portion 12. For example, the reference point is a portion corresponding to a predetermined distance from both ends of the two-dimensional shape data toward the inner peripheral side (center). You may comprise so that it may identify as a point. In addition, as a method for specifying the reference point, for example, from the two ends of the two-dimensional shape data toward the center, the measured value becomes large after being minimized at the portion corresponding to the annular groove portion 7, and is maximized at the protruding end 9. Since it becomes small after becoming, it may be constituted so that the part which produces a maximum value in this way may be specified as a reference point. Alternatively, since the measured value increases toward the both ends from the local minimum position in the panel unit 10 and reaches the local maximum at the protruding end 9, the local maximum point may be specified as the reference point. Good.

  Here, with reference to FIG. 4, the predetermined reference point and range in the two-dimensional shape data of the bottom cover 5 will be described. FIG. 4 exemplifies data indicating the shape of a portion to be irradiated with the two-dimensional laser beam on the surface of the bottom cover 5, and two different locations having the above-mentioned maximum values are specified as the reference points P and P. The locations specified as these reference points P and P are the shape data of the portion corresponding to the protruding end 9, that is, the portion corresponding to one point on the protruding end 9 and another point on the protruding end 9. Further, an area X defined by a straight line (line segment) a connecting the reference points P and P and a curve b corresponding to the contour line of the surface of the panel portion 10 recessed inside the bottle-shaped can 1. A cross-sectional area (hereinafter referred to as a cross-sectional area X) is specified as a cross-sectional area X for determining whether the internal pressure is good or bad. The controller 15 calculates the value of the cross-sectional area X specified from the two-dimensional shape data as described above, and determines whether the internal pressure is good or not based on the calculated cross-sectional area. For example, the cross-sectional area X when the internal pressure is 0 kPa illustrated in FIG. 4B is smaller than the cross-sectional area X when the internal pressure is −40 kPa illustrated in FIG.

Here, the correlation between the internal pressure of the bottle-type can 1 and the cross-sectional area X will be described with reference to FIG. FIG. 6 exemplifies the result of measuring the correlation between the cross-sectional area X and the internal pressure of the bottle-type can 1, and the area of the cross-sectional area X due to deformation according to the internal pressure of the bottom lid 5 in the bottle-type can 1. The data shows the results of measuring a plurality of data for each internal pressure by decreasing the internal pressure from 0 kPa by 10 kPa. From this measurement result, it was recognized that there is a strong correlation between the internal pressure and the cross-sectional area X. Note that “R ² ” described in FIG. 6 is a probability distribution. Furthermore, the sectional area X substantially means the sectional area A described above. For example, if the internal pressure of the bottle-shaped can 1 is within a normal range, the value of the cross-sectional area X is included within a predetermined range corresponding to the normal internal pressure. On the other hand, if the internal pressure is high due to the generation of gas due to pinholes or deterioration of contents (if the negative pressure is insufficient), the panel portion 10 is placed on the straight line connecting the protruding ends 9. Since the amount of deformation that deforms inward decreases, the value of the cross-sectional area X becomes smaller than the lower limit value that defines the normal range. On the contrary, if the internal pressure of the bottle-type can 1 is excessively low, the amount of deformation of the panel portion 10 deforming inward of the container increases with respect to the straight line, so the value of the cross-sectional area X defines the normal range. It becomes larger than the upper limit value. Therefore, the quality of the internal pressure is determined based on the correlation between the value of the cross-sectional area X and the internal pressure of the bottle-type can 1, and specifically, the obtained cross-sectional area X value and predetermined upper and lower limit values (Reference value) is compared, and when the normal range is exceeded, it is determined that the internal pressure is poor.

  And since the bottle-type can 1 on the conveyor 3 is specified by the detection value of the rotary encoder and the detection signal of the photoelectric sensor 14, the bottle-type can 1 determined as having an internal pressure failure as described above is specified. Therefore, the bottle-shaped can 1 with poor internal pressure is removed from the transport line by a predetermined evacuation mechanism (not shown) on the downstream side in the transport direction on the conveyor 3.

  According to the present invention, since the calculated value (the value of the cross-sectional area X) for the cross-sectional area A in the bottom lid 5 and the internal pressure are correlated, the internal pressure can be determined by comparing the calculated value with a reference value prepared in advance. Can be accurately determined. Further, since the shape of the bottom lid 5 can be measured by irradiating the two-dimensional laser beam toward the bottom lid 5 once, the bottle-shaped can 1 being transported is tilted from an upright state, for example. Even if this occurs, the two-dimensional shape data is not easily affected. Therefore, since the shape of the bottom lid 5 deformed by the linear irradiation surface can be accurately measured, it is possible to perform a more accurate internal pressure determination than the measurement method using a plurality of dot-shaped irradiation surfaces. . Furthermore, the waveform of the two-dimensional shape data is less disturbed, so that the deviation between the area of the cross-sectional area X and the actual cross-sectional area A is reduced, the calculated area value is accurate, and the internal pressure can be accurately determined. it can. Moreover, since it is sufficient to irradiate one workpiece with a two-dimensional laser beam once, the process time for determining the internal pressure can be reduced. And in this invention, since the quality of the internal pressure can be determined by calculating the two-dimensional shape data obtained by the laser type displacement sensor, the configuration of the apparatus can be simplified and additionally installed in the existing equipment. Easy to do.

  The present invention is not limited to the specific examples described above, and the configuration can be changed as appropriate without departing from the object of the present invention. For example, the sealed container to be inspected is not limited to the bottle-shaped can in the specific example described above, but a so-called three-piece type container in which a canopy is attached to the upper end of the trunk and a bottom lid is attached to the lower end, and the bottom is integrated. It may be a so-called two-piece type container in which a canopy is attached to the upper end of the body portion formed in the above. Furthermore, it is not limited to a sealed container of a metal can, and may be a synthetic resin container.

  Further, the sealed container may be a negative pressure container in which the internal pressure of the container is lower than atmospheric pressure, or may be a positive pressure container higher than atmospheric pressure. That is, in the internal pressure inspection apparatus or method for a sealed container according to the present invention, it is possible to determine whether the internal pressure is good or not by measuring the deformed shape of the lid of the sealed container. Whether it is a container or not. For example, when the object is a positive pressure container, the central portion of the lid portion swells most, a deformed shape associated with the bulge is measured, and the aforementioned cross-sectional area based on the shape may be obtained. Therefore, the quality of the internal pressure of the sealed container can be determined by measuring the shape of the lid when the depression deformation is caused by the internal pressure and the shape of the lid when the expansion deformation is caused by the internal pressure.

  Further, since the displacement sensor and the sealed container to be inspected need only be relatively moved when measuring the displacement, the sealed sensor may be fixed and the displacement sensor may be moved. In addition, the reference point for calculating the cross-sectional area for use in the internal pressure determination in the present invention is not limited to the predetermined point on the protruding end described above, and may be an appropriate value in the panel portion forming the central portion of the lid portion. It may be a place. In addition, when a plurality of sealed containers are transported on a conveyor, even if the left and right positions with respect to the traveling direction of the sealed containers passing through the pass line are relatively displaced, the sealed containers are targeted for inspection. In addition, the container shape can be accurately measured.

  In the above-described specific example, the displacement sensor configured to include the cylindrical lens has been described. However, the present invention is not limited to this, and may be a laser-type displacement sensor in which the irradiated laser beam is linear. The wavelength of the irradiation light is not particularly limited.

  DESCRIPTION OF SYMBOLS 1 ... Bottle type can, 3 ... Conveyor, 4 ... Body part, 5 ... Bottom cover, 7 ... Annular groove part, 8 ... Inner peripheral side inclined wall, 9 ... Projection end, 10 ... Panel part, 12 ... Coupling part, 13 ... Laser displacement sensor, 14 ... photoelectric sensor, 15 ... controller, P ... reference point, A, X ... area (cross-sectional area).

Claims (4)

In an internal pressure inspection device for a sealed container that has a lid portion connected to the trunk portion by a coupling portion on at least one of the upper end portion and the lower end portion of the trunk portion, and the lid portion is deformed by internal pressure,
A linear shape that is formed on the lid portion closer to the center of the lid portion than the coupling portion and that connects a point on the protruding end that protrudes outside the sealed container and another point on the protruding end. A displacement sensor that measures the cross-sectional shape along the straight line connecting the points of the lid by irradiating the two-dimensional laser beam and receiving the reflected light;
A sealed container comprising: a determination unit that obtains a cross-sectional area of an area partitioned by the straight line and the lid in the cross-sectional shape and determines the quality of the internal pressure based on the cross-sectional area. Internal pressure inspection device. The lid portion is continuous with the inner peripheral side of the coupling portion and is recessed in the sealed container, and the protruding end of the annular groove portion on the inner peripheral side inclined wall to the outside of the sealed container. , And a panel portion that is a portion on the center side of the lid portion from the protruding end,
The internal pressure inspection device for a sealed container according to claim 1, wherein the cross-sectional area is a cross-sectional area of a region defined by the straight line and the panel portion in the cross-sectional shape. In the internal pressure inspection method for a sealed container having a lid portion connected to the trunk portion by a coupling portion on at least one of the upper end portion and the lower end portion of the trunk portion, and the lid portion is deformed by internal pressure,
A straight line that connects one point on the protruding end that protrudes outward from the sealed container and another point on the protruding end that is formed on the lid portion closer to the center of the lid portion than the coupling portion. Measure the cross-sectional shape along the straight line connecting the points of the lid by a displacement sensor that receives the reflected light by irradiating a linear two-dimensional laser beam along
A method for inspecting an internal pressure of a sealed container, wherein a cross-sectional area of an area defined by the straight line and the lid in the cross-sectional shape is obtained and whether the internal pressure is good or bad is determined based on the cross-sectional area. The lid portion is continuous with the inner peripheral side of the coupling portion and is recessed in the sealed container, and the protruding end of the annular groove portion on the inner peripheral side inclined wall to the outside of the sealed container. , And a panel portion that is a portion on the center side of the lid portion from the protruding end,
The said cross-sectional area is a cross-sectional area of the area | region divided by the said straight line and the said panel part in the said cross-sectional shape, The internal pressure test | inspection method of the sealed container of Claim 3 characterized by the above-mentioned.

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