WO2014050782A1 - 肉厚検査装置 - Google Patents
肉厚検査装置 Download PDFInfo
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- WO2014050782A1 WO2014050782A1 PCT/JP2013/075630 JP2013075630W WO2014050782A1 WO 2014050782 A1 WO2014050782 A1 WO 2014050782A1 JP 2013075630 W JP2013075630 W JP 2013075630W WO 2014050782 A1 WO2014050782 A1 WO 2014050782A1
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- thickness
- bottle
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- measurement
- electrode pattern
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
- G01B7/087—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring of objects while moving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
Definitions
- the present invention relates to a thickness inspection apparatus for inspecting the thickness of a contact portion by bringing a sensor portion into contact with the surface of an inspection object such as a bottle.
- the present invention has a barrel shape in which the shape of the body portion in plan view is a square shape (hereinafter referred to as “square bottle”) or an elliptic shape (hereinafter referred to as “elliptical bottle”).
- the present invention relates to a thickness inspection apparatus capable of performing an accurate thickness inspection even for a bottle whose degree of curvature along the circumferential direction of the peripheral surface is not constant over the entire circumference.
- bottles manufactured one after another in a plurality of sections of a bottle making machine are inspected for defects by passing through an inspection line while being transported to the final packaging process.
- a bottle inspection apparatus installed in this type of inspection line there is a configuration in which a plurality of inspection stations are arranged around a star wheel.
- the star wheel 8 shown in FIG. 17 is provided with a plurality of recesses 80 on the outer peripheral surface, and the bottle 10 introduced into each recess 80 is sequentially fed to each inspection station by the intermittent rotation of the star wheel 8.
- the bottle 10 to be inspected is supported at the center of rotation of the upper surface of the support table, and the thickness of the bottle 10 is rotated by rotating the bottle 10 around the central axis by the rotation drive mechanism.
- the thickness of the bottle 10 is measured over the entire circumference by an inspection device, and the quality of the bottle 10 is inspected.
- a capacitance detector 9 that detects the capacitance between the electrode pattern of the measurement electrode and the electrode pattern of the ground electrode by bringing the sensor unit 90 into contact with the surface of the bottle 10 is provided.
- Some have been used for example, see Patent Document 1). Since the electrostatic capacity detector 9 includes an elastic body 91 that urges and presses the sensor unit 90 toward the surface of the bottle 10, even if the bottle 10 vibrates, the vibration is detected by the elastic body. By absorbing by 91, the contact state between the sensor unit 90 and the surface of the bottle 10 is stably maintained.
- the sensor unit 90 is obtained by bonding a synthetic resin electrode sheet 93 having an electrode pattern to the surface of a strip-shaped mounting substrate 92 that is curved over its entire length. Between the electrode pattern of the measurement electrode and the electrode pattern of the ground electrode, the capacitance of the part that is in contact with the bottle 10 is detected, and the detection output of the capacitance is taken into a calculation control device (not shown) Converted to thickness.
- the object to be inspected is a round bottle 10 having a cylindrical shape as shown in FIG. 17, the degree of curvature along the circumferential direction of the peripheral surface of the barrel of the bottle 10 is constant over the entire circumference. is there. For this reason, the contact state between the sensor unit 90 and the outer peripheral surface of the bottle 10 is kept constant.
- the object to be inspected is a square bottle 10A as shown in FIGS. 18 and 19, the degree of curvature along the circumferential direction of the peripheral surface of the body of the bottle 10A is not constant over the entire circumference. For this reason, the state (a state shown in FIG.
- the object to be inspected is the elliptical bottle 10B shown in FIG. 20, and the degree of curvature along the circumferential direction of the circumferential surface of the body of the elliptical bottle 10B is not constant over the entire circumference. For this reason, the relative positional relationship between the surface of the elliptical bottle 10 ⁇ / b> B and the electrode pattern of the sensor unit 90 changes between the state in contact with the gently curved short diameter portion 13 and the state in contact with the sharply curved long diameter portion 14. . As a result, even if the wall thickness of the elliptical bottle 10B is uniform over the entire circumference, the detected capacitance varies depending on the region.
- FIGS. 21 (1) and 21 (2) show the results of measuring the thickness of the upper end of the barrel of the square bottle 10A over the entire circumference.
- a line graph I shows the thickness of the bottle over the entire circumference obtained by measuring the thickness of the square bottle 10A for each predetermined angle with a mechanical gauge (for example, dial thickness gauge 100 described later). The measured value (hereinafter referred to as “reference value”) is shown, and the line graph K measures the thickness of the square bottle 10A at every predetermined angle by the thickness inspection apparatus using the capacitance detector 9 shown in FIG. The measured value of the wall thickness over the entire circumference of the bottle is shown.
- a line graph Q indicates a measurement error for each angle of the measurement value K with respect to the reference value I. Although the measurement error at the facing portion 11 is small, the measurement error at the corner portion 12 is shown. Is a large value.
- 22 (1) and 22 (2) show the results of measuring the wall thickness of the lower end portion of the barrel portion of the square bottle 10A over the entire circumference.
- a line graph I is obtained by measuring the thickness of the square bottle 10A at every predetermined angle with a mechanical gauge (for example, dial thickness gauge 100 described later) over the entire circumference of the bottle.
- the measured value (reference value) of the wall thickness is shown
- the line graph K is obtained by measuring the wall thickness of the square bottle 10A for each predetermined angle by the wall thickness inspection apparatus using the capacitance detector 9 shown in FIG.
- the measurement value of the wall thickness obtained over the entire circumference of the bottle is shown, and the line graph Q shows the measurement error for each angle of the measurement value K with respect to the reference value I.
- the measurement error at the facing portion 11 is small, but the corner The measurement error in the portion 12 is a large value.
- the measurement error of the wall thickness of the elliptical bottle 10B also differs depending on the measurement site, and the long diameter portion that sharply curves with respect to the measurement error in the short diameter portion 13 that gently curves.
- the measurement error at 14 increases.
- the sensor unit 90 Is pulled in the rotation direction of the square bottle 10A (indicated by an arrow a in the figure), and the elastic body 91 may be compressed and deformed while being distorted in the rotation direction a.
- the contact position of the sensor portion 90 with the outer peripheral surface of the bottle 10A changes between the corner portion 12 and the facing portion 11 of the bottle 10A, and not only the thickness measurement value varies.
- the present invention has been made paying attention to the above problem, and the degree of curvature along the circumferential direction of the circumferential surface of the body portion is not constant over the entire circumference, such as a square bottle or an elliptic bottle, when the inspection object is a square bottle or an elliptic bottle. Even if it exists, it aims at providing the thickness inspection apparatus in which the relative positional relationship of the surface of a test object and an electrode pattern hardly changes, and an accurate thickness inspection is possible over the perimeter. Another object of the present invention is that there is no possibility of causing a jumping phenomenon in which the sensor portion is separated from the outer peripheral surface of the thickness inspection target portion even if the inspection target is a square bottle. It is to provide a thickness inspection apparatus.
- a thickness inspection apparatus includes a capacitance detector that detects a capacitance of a target portion of a thickness inspection, and takes the capacitance detected by the capacitance detector and converts it into a thickness. And an arithmetic and control unit that executes processing.
- the capacitance detector includes a sensor unit that makes contact with the surface of a target site for thickness inspection, and an elastic body that biases the sensor unit toward the target site, and the sensor unit has a radius of curvature.
- R has a curved surface of 2 mm ⁇ R ⁇ 10 mm. The curved surface is formed so that at least one of the electrode pattern of the measurement electrode and the electrode pattern of the ground electrode is positioned on the surface of the curved portion of the belt-like mounting substrate. It is formed by sticking the made synthetic resin electrode sheet to the mounting substrate.
- the degree of curvature along the circumferential direction of the circumferential surface of the body portion is not constant over the entire circumference, like a square bottle. Even so, since the radius of curvature R of the sensor part is set to the smallest possible value, the sensor part comes into contact with a substantially flat facing part with a small degree of curvature and a corner part with a large degree of curvature. The relative positional relationship between the surface of the object to be inspected and the electrode pattern of the sensor part hardly changes between the states. As a result, there is no risk that the detected capacitance will be different depending on the part, even though the thickness of the inspection object is the same over the entire circumference, and the thickness is mistakenly recognized. Can be prevented.
- the electrode sheet is adhered from the front surface to the back surface of the mounting substrate, the electrode pattern of the measurement electrode is located on the front surface of the mounting substrate, and the electrode pattern of the ground electrode on the back surface.
- Each electrode pattern is represented so that is positioned.
- the elastic body is a fan-shaped sponge having a constant thickness or an open-cell foam, and the whole of the elastic body is expanded and contracted with a portion corresponding to the fan-shaped crimp as a fulcrum.
- the mounting substrate is attached to the first side end face so that the curved portion faces outward, and the other second side end face is attached to the substrate.
- the sensor portion when the sensor portion is brought into contact with the outer peripheral surface of the square bottle, when the state of contact with the facing portion is changed from the state of contact with the facing portion by the shaft rotation of the square bottle, the sensor is Even if the part is pulled in the direction of rotation of the bottle, the elastic body does not distort in the direction of rotation and the whole body compresses and deforms around the fulcrum. The position of contact with the outer peripheral surface of the plate hardly changes.
- the contact position of the sensor portion with respect to the outer peripheral surface of the square bottle moves from the corner portion to the facing portion, the elastic body is compressed and deformed without being distorted in the rotation direction, so that the restoring force of the elastic body may be weakened. As a result, the restoring force effectively acts in the direction toward the square bottle.
- the sensor unit moves following the rotation of the square bottle, and a jumping phenomenon that deviates from the outer peripheral surface of the square bottle is prevented.
- the inspection object is a square bottle or an elliptic bottle
- the degree of curvature along the circumferential direction of the circumferential surface of the body portion is not constant over the entire circumference
- the surface of the inspection object The relative positional relationship between the electrode pattern and the electrode pattern hardly changes over the entire circumference, and an accurate thickness inspection is possible over the entire circumference.
- the elastic body is configured by using a fan-shaped sponge having a constant thickness or an open-cell foam, so that a jumping phenomenon in which the sensor part is separated from the surface of the inspection object is generated. Can be prevented.
- FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. It is sectional drawing which shows the other Example of an electrode pattern. It is a figure which shows the thickness conversion curve for converting the detected electrostatic capacitance into thickness.
- FIG. 1 shows the overall configuration of a thickness inspection apparatus 1 according to an embodiment of the present invention.
- the illustrated thickness inspection apparatus 1 is used to inspect the thickness of a glass bottle, but is not limited to this, and it is also possible to inspect the thickness of a synthetic resin bottle, Not only bottles, but also the thickness of various containers, and the thickness of plate-like bodies can also be inspected.
- the illustrated thickness inspection apparatus 1 inspects the square bottle 10A shown in FIG. 19 and is installed in one of a plurality of inspection stations provided around a star wheel (not shown). .
- the illustrated thickness inspection apparatus 1 is suitable for the thickness inspection of the rectangular bottle 10A, but is also suitable for inspecting the thickness of the elliptical bottle 10B shown in FIG.
- the square bottle 10A is not limited to a quadrangular shape in the plan view, but may be a pentagonal shape, a hexagonal shape, or the like.
- a plurality of recesses are provided on the outer peripheral surface of the star wheel.
- a square bottle (hereinafter simply referred to as “bottle”) 10A introduced into each recess is constrained in the recess, It is forwarded to each inspection station by intermittent rotation.
- the bottle 10A to be inspected is supported on the rotation center of a freely rotatable horizontal support table 20.
- the bottle 10A is rotated about the central axis c of the bottle 10A by the rotation drive mechanism 2, and thereby the thickness of the bottle 10A is inspected over the entire circumference.
- the rotation drive mechanism 2 in the illustrated example includes the support table 20, a drive roller 21 that contacts the outer peripheral surface of the mouth of the bottle 10A supported on the support table 20, and rotationally drives the bottle 10A by frictional force during rotation.
- the pair of left and right universal rollers 22 and 23 that support the opening of the bottle 10A with the driving roller 21 and a driving device (not shown) that rotationally drives the driving roller 21 are configured.
- the rotation drive mechanism 2 may be of a type that directly rotates the support table 20.
- FIG. 1 shows a state in which the thickness of the bottle 10A is simultaneously measured and inspected at two locations, the upper position and the lower position of the body portion. There may be three or more locations.
- two capacitance detectors 4 and 4 are electrically connected to the apparatus main body 3 by means of cord lines 30 and 30, respectively.
- an operation unit 32 in which a plurality of key switches and display lamps are arranged is provided on the front surface of the apparatus body 3.
- Each capacitance detector 4 is fixedly mounted on fixing bases 34 and 35 arranged so as to be movable up and down along a vertical mounting stand 33.
- the detection output of the analog quantity obtained by each of the capacitance detectors 4 and 4 is extracted at a predetermined sampling period, converted into a digital quantity, and taken into an arithmetic control device incorporated in the apparatus body 3.
- a calculation control device converts each sample data of the detection output by the capacitance detector 4 into a wall thickness based on the wall thickness conversion curves A and B (details will be described later) as shown in FIG. . Further, the arithmetic and control unit controls a series of input / output operations of the operation unit 32 and controls a display operation of the monitor unit 31.
- This arithmetic and control unit includes a microprocessor that is a subject of arithmetic and control, a memory that stores programs and data, and the like. The memory stores conversion data constituting the thickness conversion curves A and B.
- the microprocessor refers to the memory, converts each sample data for one round of the detection output bottle 10A by the capacitance detector 4 into a wall thickness, stores the sample data in the memory, and stores the stored data in the monitor unit 31. Display.
- Each capacitance detector 4 detects the capacitance of the portion of the support table 20 that is in contact with the bottle 10A that rotates on its axis. As shown in FIGS. 2 and 3, the capacitance detector 4 is applied to the surface of the bottle 10A.
- a sensor unit 5 to be contacted, an elastic body 6 that urges and presses the sensor unit 5 toward the surface of the bottle 10 ⁇ / b> A, and a detector main body 40 are configured.
- the detector body 40 is electrically connected to an electrode pattern (details will be described later) of the synthetic resin electrode sheet 7 constituting the sensor unit 5 via a printed wiring board 41 and three connector pins 42a to 42c. It has a built-in capacitance detection circuit.
- the sensor unit 5 has a curved surface 50 set to a predetermined radius of curvature R.
- a protective film 54 for covering an electrode sheet 7 to be described later is put on the curved surface 50 of the sensor unit 5.
- the curved surface 50 is formed by rolling the flexible electrode sheet 7 so that an electrode pattern 71 of a measurement electrode, which will be described later, is positioned on the surface of a curved portion 52 formed at one end of a strip-shaped mounting substrate 51. It is configured by bending and sticking in an arc.
- the radius of curvature R of the curved surface 50 is desirably set as small as possible. In this embodiment, the radius of curvature R is set to 4 mm. However, if 2 mm ⁇ R ⁇ 10 mm, the curved surface 50 can be manufactured.
- the measurement error described above is also practically acceptable.
- the curvature radius R is set to 2 mm or more and 10 mm or less, which will be described later.
- the electrode sheet 7 has a strip shape and is formed to have a constant width over the entire length, and is attached to the curved portion 52 and the flat portion 53 of the mounting substrate 51.
- the elastic body 6 is formed of a sponge having a constant thickness or an open-cell foam.
- a portion that hits the sector shape is used as a fulcrum 60, and the elastic body 6 is formed so that the angle ⁇ formed by the side end surfaces 61 and 62 with the fulcrum 60 as the center is small.
- the whole of contracts are attached to one first side end surface 61 of the elastic body 6 with the sensor unit 5 facing outward.
- the other second side end face 62 of the elastic body 6 is attached to the upper surface of a strip-like printed wiring board 41 attached on the opening of the case body 43 constituting the detector body 40.
- the electrode sheet 7 has an electrode pattern of measurement electrodes (hereinafter referred to as “measurement electrode pattern”) 71 and electrode patterns of ground electrodes (hereinafter referred to as “earth electrode patterns”) 72a and 72b. Is represented.
- electrode patterns hereinafter referred to as “guard electrode patterns” 73a and 73b of guard electrodes for suppressing the influence of capacitance other than the bottle 10A are further shown.
- S1 is an area positioned and fixed on the surface of the curved portion 52 of the mounting substrate 51, and only the measurement electrode pattern 71 exists in this area S1.
- S2 is an area positioned and fixed along the back surface of the curved portion 52. In this area S2, the guard electrode pattern 73b and the ground electrode patterns 72b and 72b exist so as to sandwich the guard electrode pattern 73b.
- S3 is an area positioned and fixed along the surface of the flat portion 53 of the mounting substrate 51, and the measurement electrode pattern 71, the guard electrode pattern 73a, and the ground electrode pattern 72a exist in this area S3.
- S4 is a region fixed along the back surface of the flat surface portion 53 of the mounting substrate 51 and the surface of the printed wiring board 41.
- connection patterns 74 to 76 that are electrically connected to the three connector pins 42a to 42c are formed at the end of the region S4.
- the measurement electrode pattern 71 is located at the center of the width.
- the ground electrode pattern 72 b is positioned on the back side of the curved surface 50, that is, on both side edges of the back surface of the curved portion 52 of the mounting substrate 51.
- the measurement sensitivity of capacitance is increased.
- the arrows indicated by dotted lines indicate lines of electric force extending from the measurement electrode pattern 71 to the ground electrode patterns 72b (FIG. 6) and 72 (FIG. 7).
- Lead wires 55a and 55b are connected to the measurement electrode pattern 71 and the guard electrode pattern 73a of the electrode sheet 7 located on the flat portion 53 of the mounting substrate 51.
- the two lead wires 55a and 55b are bundled into one lead wire 55 and led to the back surface of the printed wiring board 41, and the conductive pattern (not shown) printed on the back surface of the printed wiring board 41 is electrically connected. It is connected.
- the ground electrode pattern 72a on the flat surface portion 53 of the mounting substrate 51 is electrically connected to the ground electrode patterns 72b and 72b on both sides of the back surface by conducting wires 56 and 56.
- the conductive pattern on the back surface of the printed wiring board 41 and the connection patterns 74 to 76 of the electrode sheet 7 are electrically connected to the connector pins 42a to 42c.
- Each connector pin 42a to 42c is connected to a connector (not shown) incorporated in the detector body 40, whereby the measurement electrode pattern 71, ground electrode patterns 72a and 72b, and guard electrode pattern 73a of the electrode sheet 7 are connected. 73b and a capacitance detection circuit incorporated in the detector body 40 are electrically connected.
- the capacitance detection circuit outputs a voltage value V corresponding to the capacitance of the part to be subjected to thickness inspection, that is, the part where the sensor unit 5 is in contact. This detection output is taken into an arithmetic control device incorporated in the apparatus body 3.
- the configuration of the capacitance detection circuit is a known one disclosed in Patent Document 1 (Japanese Patent No. 3416084), and detailed description thereof is omitted here.
- FIG. 8 illustrates a wall thickness conversion curve used for converting the voltage value V into the wall thickness d in the arithmetic and control unit.
- A is the capacitance detector 4 (hereinafter referred to as “new type capacitance detector 4”) having the above-described configuration, and the curvature radius R of the curved surface 50 of the sensor unit 5 is 4 mm. It is a thickness conversion curve applied.
- B is a thickness conversion curve applied to the conventional capacitance detector 9 shown in FIG. 17 (hereinafter referred to as “old type capacitance detector 9”).
- Each of the wall thickness conversion curves A and B is obtained by multiplying the measurement data obtained by measuring the wall thickness of a plate glass whose wall thickness is known by the respective capacitance detectors 4 and 9 by a coefficient. The coefficient is determined so that the multiplication value becomes a known thickness value.
- the old-type capacitance detector 9 is mainly used for thickness inspection for objects other than the square bottle 10A and the elliptical bottle 10B, and the above-described thickness conversion curve B is applied.
- the radius of curvature R of the curved surface of the sensor unit 90 is set to 17 mm.
- FIG. 9 (1) shows a dial thickness gauge 100 and a new type of electrostatic discharge for sample 1 made of a flat plate, sample 2 made of a cylinder having a radius of 30 mm, and sample 3 made of a cylinder having a radius of 14 mm.
- the capacitance detector 4 having the curvature radius R of the curved surface 50 of the sensor unit 5 of 4 mm, 8 mm, and 10 mm, and the old type capacitance detector 9 has a wall thickness of 2 mm.
- the measurement results when measuring the thickness of each sample 1 to 3 are shown.
- I 1 to I 3 are thickness measurement data (reference data) by the dial thickness gauge 100 shown in FIG.
- J 1 to J 3 are new capacitances having a curvature radius R of the curved surface 50 of 4 mm.
- Thickness measurement data by the detector 4 N 1 to N 3 are thickness measurement data by the new type capacitance detector 4 having a curvature radius R of the curved surface 50 of 8 mm, and M 1 to M 3 are curved surfaces
- K 1 to K 3 are thickness measurement data by the old type capacitance detector 9.
- Samples 1 to 3 are made of synthetic resin, and the material is polyvinylidene fluoride (PVDF) having a dielectric constant similar to that of soda glass.
- PVDF polyvinylidene fluoride
- a dial thickness gauge 100 shown in FIG. 11 is provided with contacts 102 and 103 facing each other at the tips of flexible U-shaped arms 101 and 101, and a sample is provided between the contacts 102 and 103.
- the pointer 105 of the dial 104 touches the scale corresponding to the thickness according to the thickness.
- the reference measurement for the data I 1 ⁇ I 3 data J 1 ⁇ J 3, N 1 ⁇ N 3, M 1 ⁇ M 3, K 1 ⁇ K 3 of the measurement error P 1 ⁇ P 3, R 1 to R 3 , S 1 to S 3 , and Q 1 to Q 3 are shown.
- the measurement errors P 2 to P 3 , R 2 to R 3 , and S 2 to S 3 of the thickness measurement data by the new type capacitance detector 4 are the old type.
- the measurement error Q 2 to Q 3 of the wall thickness measurement data by the capacitance detector 9 is sufficiently smaller than P 2 , R 2 , S 2 ⁇ Q 2 , P 3 , R 3 , S 3 ⁇ Q 3 is there.
- the measurement errors P 2 to P 3 , R 2 to R 3 , and S 2 to S 3 of the thickness measurement data by the new type capacitance detector 4 are caused by the curvature radius R of the curved surface 50 of the sensor unit 5. Is smaller, and P 2 ⁇ R 2 ⁇ S 2 and P 3 ⁇ R 3 ⁇ S 3 .
- N 3 , and M 3 , N 3 ⁇ N 2 , M 3 ⁇ M 2 , and the measurement errors are R 2 ⁇ R 3 , S 2 ⁇ S 3 , but the measurement data J 2 , J for 3 is J 2 ⁇ J 3, the measurement error is also P 2 ⁇ P 3.
- FIGS. 10 (1) and 10 (2) show a dial thickness gauge 100 and a new type capacitance detector 4 for the samples 1 to 3 having a thickness of 1 mm, and the curved surface 50 of the sensor unit 5.
- the measurement data when the radius of curvature R is 4 mm, 8 mm and 10 mm, and the old type capacitance detector 9 and the measurement error when the thickness measurement is performed are shown. .
- the measurement errors P 2 to P 3 , R 2 to R 3 , and S 2 to S 3 of the thickness measurement data by the new type capacitance detector 4 are the old type.
- the measurement error Q 2 to Q 3 of the wall thickness measurement data by the capacitance detector 9 is sufficiently smaller than P 2 , R 2 , S 2 ⁇ Q 2 , P 3 , R 3 , S 3 ⁇ Q 3 is there.
- the measurement errors P 2 to P 3 , R 2 to R 3 , and S 2 to S 3 of the thickness measurement data by the new type capacitance detector 4 are caused by the curvature radius R of the curved surface 50 of the sensor unit 5. Is smaller, and P 2 ⁇ R 2 ⁇ S 2 and P 3 ⁇ R 3 ⁇ S 3 .
- N 3 , and M 3 , N 2 ⁇ N 3 , M 2 ⁇ M 3 , J 2 ⁇ J 3 , and measurement errors are also R 2 ⁇ R 3 , S 2 ⁇ S 3 , P 2 ⁇ P 3 .
- FIGS. 12 (1) and 12 (2) show a state in which the thickness of the square bottle 10A is measured by the old-type capacitance detector 9 described above.
- 12 (1) shows a state in which the sensor unit 90 is in contact with the facing portion 11 with a small degree of bending along the circumferential direction
- FIG. 12 (2) shows a corner where the sensor unit 90 has a large degree of bending along the circumferential direction.
- Each of the states in contact with the portion 12 is shown. Assuming that the capacitance of the region from the surface of the square bottle 10A to the distance L is measured, the measurement range e2 of the corner portion 12 and the measurement range e1 of the facing portion 11 are e2 ⁇ e1, and both The ratio (e1 / e2) is a value greater than 1. Since the capacitance is proportional to the area of the electrode, the measured thickness value of the corner portion 12 is smaller than the measured thickness value of the facing portion 11.
- FIGS. 13 (1) and 13 (2) show a state in which the thickness of the square bottle 10A is measured by a new type capacitance detector 4 with a curvature radius R of the curved surface 50 of the sensor unit 5 of 4 mm. Is shown.
- FIG. 13 (1) shows a state in which the sensor unit 5 is in contact with the facing portion 11 where the degree of bending along the circumferential direction is small
- FIG. 13 (2) shows a corner where the sensor unit 5 has a large degree of bending along the circumferential direction.
- Each of the states in contact with the portion 12 is shown.
- the measurement range f2 of the corner portion 12 and the measurement range f1 of the facing portion 11 are f2 ⁇ f1, and both
- the ratio (f1 / f2) is a value close to 1, and the measured value of the thickness of the corner portion 12 and the measured value of the thickness of the facing portion 11 are substantially the same value.
- the radius of curvature R of the curved surface 50 of the sensor unit 5 is desirably as small as possible.
- the measured thickness value of 12 and the measured thickness value of the facing portion 11 are close to each other.
- the curvature radius R of the curved surface 50 is preferably set to a value lower than 10 mm with the upper limit being 10 mm.
- PVDF polyvinylidene fluoride
- the measurement error is 0. 3 mm (see FIG. 10 (2)). If the curvature radius R of the curved surface 50 of the sensor unit 5 exceeds 10 mm, the measurement error is further increased and is not practical, so the upper limit value of the curvature radius R is 10 mm. From the above, considering both manufacturing efficiency and measurement error, it is more desirable to set the curvature radius R of the curved surface 50 of the sensor unit 5 to around 4 mm, that is, from 3 mm to 5 mm.
- 14 (1) and 14 (2) show the measurement of the wall thickness of the upper end of the body of the square bottle 10A using the electrostatic capacitance detector 4 having a radius of curvature R of the curved surface 50 of the sensor unit 5 of 4 mm.
- 15 (1) and (2) show the results of measuring the wall thickness of the lower end portion of the barrel portion of the square bottle 10A over the entire circumference.
- a line graph I shows the measured value (reference value) of the wall thickness of the entire circumference of the bottle obtained by measuring the thickness of the square bottle 10A for each predetermined angle with the dial thickness gauge 100 described above.
- the line graph Q shows the measurement error for each angle of the measurement value J with respect to the reference value I, and the measurement error at the facing portion 11 is measured at the corner portion 12 for both the upper end portion and the lower end portion of the trunk portion. The error is also suppressed to a sufficiently small value.
- FIGS. 16 (1) and 16 (2) show the body of the elliptical bottle 10A using the electrostatic capacity detector 4 having a radius of curvature R of the curved surface 50 of the sensor unit 5 of 4 mm. The result of having measured the wall thickness of the upper end part of a part over the perimeter is shown. According to the figure, the measurement error is suppressed to a sufficiently small value regardless of whether it is the short diameter portion 13 or the long diameter portion 14 of the elliptical bottle 10B.
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Abstract
Description
なお、図示していないが、楕円形びん10Bについても測定部位によって肉厚の測定誤差が相違するもので、緩やかに湾曲する短径部分13での測定誤差に対して、急峻に湾曲する長径部分14での測定誤差が大きくなる。
また、この発明が他に目的とするところは、検査対象物が角形びんのようなものであっても、センサー部が肉厚検査の対象部位の外周面より乖離するジャンピング現象が起こるおそれのない肉厚検査装置を提供することにある。
また、好ましい実施態様のものでは、弾性体は扇形状をなす一定肉厚のスポンジまたは連続気泡の発泡体を用いて構成されるので、検査対象物の表面よりセンサー部が乖離するジャンピング現象の発生を防ぐことができる。
上記の電極シート7は、図4に示すように、帯状をなし、ほぼ全長にわたって一定幅に形成されており、取付基板51の湾曲部52および平面部53の表裏にわたって貼着されている。
なお、静電容量検出回路は肉厚検査の対象部位、すなわち、センサー部5を当接させた部位の静電容量に相応する電圧値Vを出力する。この検出出力は装置本体3に組み込まれた演算制御装置に取り込まれる。なお、静電容量検出回路の構成は、前記した特許文献1(特許第3416084)に開示された公知のものであり、ここでは詳細な説明を省略する。
図中、I1~I3は図11に示すダイヤル厚みゲージ100による肉厚の測定データ(基準データ)、J1~J3は湾曲面50の曲率半径Rが4mmの新タイプの静電容量検出器4による肉厚の測定データ、N1~N3は湾曲面50の曲率半径Rが8mmの新タイプの静電容量検出器4による肉厚の測定データ、M1~M3は湾曲面50の曲率半径Rが10mmの新タイプの静電容量検出器4による肉厚の測定データ、K1~K3は旧タイプの静電容量検出器9による肉厚の測定データである。なお、各サンプル1~3は合成樹脂製であり、材質はソーダガラスと誘電率が似通ったポリフッ化ビニリデン(PVDF)である。
図9(1)(2)によると、新タイプの静電容量検出器4による肉厚の測定データの測定誤差P2~P3,R2~R3,S2~S3は、旧タイプの静電容量検出器9による肉厚の測定データの測定誤差Q2~Q3より十分に小さく、P2,R2,S2<Q2、P3,R3,S3<Q3である。また、新タイプの静電容量検出器4による肉厚の測定データの測定誤差P2~P3,R2~R3,S2~S3は、センサー部5の湾曲面50の曲率半径Rが小さいものほど小さく、P2<R2<S2、P3<R3<S3である。
これに対して、新タイプの静電容量検出器4による半径が30mmのサンプル2の肉厚の測定データJ2,N2,M2と半径が14mmのサンプル3の肉厚の測定データJ3,N3,M3とを比較すると、N3<N2,M3<M2であって、測定誤差はR2<R3、S2<S3であるが、測定データJ2,J3についてはJ2≒J3であり、測定誤差もP2≒P3である。このことは、新タイプの静電容量検出器4であってセンサー部5の湾曲面50の曲率半径Rが4mmのものにより肉厚が2mmの角形びん10Aの肉厚を測定した場合、対面部分11の肉厚の測定値とコーナー部分12の肉厚の測定値とがほぼ同じになることを示している。
これに対して、新タイプの静電容量検出器4による半径が30mmのサンプル2の肉厚の測定データJ2,N2,M2と半径が14mmのサンプル3の肉厚の測定データJ3,N3,M3とを比較すると、N2≒N3、M2≒M3、J2≒J3であり、測定誤差もR2≒R3、S2≒S3、P2≒P3である。このことは、新タイプの静電容量検出器4により肉厚が1mmの角形びん10Aの肉厚を測定した場合、対面部分11の肉厚の測定値とコーナー部分12の肉厚の測定値がほぼ同じになることを示している。
上記のことから、製作効率と測定誤差の双方を考慮すると、センサー部5の湾曲面50の曲率半径Rは、4mmの前後、すなわち、3mm以上、5mm以下に設定するのがより望ましい。
4 静電容量検出器
5 センサー部
6 弾性体
7 電極シート
10 びん
10A 角形びん
10B 楕円形びん
50 湾曲面
51 取付基板
52 湾曲部
60 支点
71 測定電極パターン
72 アース電極パターン
Claims (3)
- 肉厚検査の対象部位の静電容量を検出する静電容量検出器と、この静電容量検出器により検出された静電容量を取り込んで肉厚に換算する処理を実行する演算制御装置とから成る肉厚検査装置であって、前記静電容量検出器は、肉厚検査の対象部位の表面に当接させるセンサー部と、そのセンサー部を対象部位に向けて付勢する弾性体とを有し、前記センサー部は、曲率半径Rが2mm≦R≦10mmの湾曲面を有しており、前記湾曲面は、帯板状の取付基板の湾曲させた部分の表面に、測定電極の電極パターンとアース電極の電極パターンのうちの少なくとも測定電極の電極パターンが位置するように各電極パターンが表された合成樹脂製の電極シートを取付基板に貼着することにより形成されて成る肉厚検査装置。
- 前記電極シートは、前記取付基板の表面から裏面にわたって貼着されており、前記取付基板の表面に測定電極の電極パターンが位置し、裏面側にアース電極の電極パターンが位置するように各電極パターンが表されている請求項1に記載された肉厚検査装置。
- 前記弾性体は、扇形状をなす一定肉厚のスポンジまたは連続気泡の発泡体であり、扇形状のかなめに当たる部分を支点として全体が拡縮するように、一方の第1の側端面には前記湾曲する部分が外向きとなるように前記取付基板が貼着され、他方の第2の側端面は基板上に貼着されている請求項1に記載された肉厚検査装置。
Priority Applications (5)
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EP13841942.9A EP2889574B1 (en) | 2012-09-28 | 2013-09-24 | Thickness inspection device |
JP2013554497A JP5718485B2 (ja) | 2012-09-28 | 2013-09-24 | 肉厚検査装置 |
CN201380050534.9A CN104685315B (zh) | 2012-09-28 | 2013-09-24 | 壁厚检查装置 |
ES13841942.9T ES2626454T3 (es) | 2012-09-28 | 2013-09-24 | Dispositivo de inspección de espesor de pared |
US14/432,196 US9341461B2 (en) | 2012-09-28 | 2013-09-24 | Wall thickness inspection device |
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EP (1) | EP2889574B1 (ja) |
JP (1) | JP5718485B2 (ja) |
CN (1) | CN104685315B (ja) |
ES (1) | ES2626454T3 (ja) |
PL (1) | PL2889574T3 (ja) |
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WO2016117244A1 (ja) * | 2015-01-21 | 2016-07-28 | 日本山村硝子株式会社 | 容器の肉厚検査装置 |
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DE102015118232B4 (de) * | 2015-10-26 | 2023-09-14 | Truedyne Sensors AG | System und Verfahren zum Überwachen eines Kanals, insbesondere eines MEMS-Kanals |
CN107677199A (zh) * | 2017-08-10 | 2018-02-09 | 江苏潮华玻璃制品有限公司 | 一种瓶体长度电子自动测量装置 |
US10466576B2 (en) * | 2017-10-20 | 2019-11-05 | Himax Technologies Limited | Method for controlling projector and associated electronic device |
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- 2013-09-24 ES ES13841942.9T patent/ES2626454T3/es active Active
- 2013-09-24 WO PCT/JP2013/075630 patent/WO2014050782A1/ja active Application Filing
- 2013-09-24 CN CN201380050534.9A patent/CN104685315B/zh not_active Expired - Fee Related
- 2013-09-24 PT PT138419429T patent/PT2889574T/pt unknown
- 2013-09-24 PL PL13841942T patent/PL2889574T3/pl unknown
- 2013-09-24 EP EP13841942.9A patent/EP2889574B1/en not_active Not-in-force
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EP2889574B1 (en) | 2017-04-05 |
CN104685315A (zh) | 2015-06-03 |
EP2889574A1 (en) | 2015-07-01 |
EP2889574A4 (en) | 2016-06-01 |
JPWO2014050782A1 (ja) | 2016-08-22 |
US9341461B2 (en) | 2016-05-17 |
ES2626454T3 (es) | 2017-07-25 |
JP5718485B2 (ja) | 2015-05-13 |
US20150276370A1 (en) | 2015-10-01 |
CN104685315B (zh) | 2017-05-03 |
PT2889574T (pt) | 2017-05-25 |
PL2889574T3 (pl) | 2017-09-29 |
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