JP5531271B2 - Bivalve inspection method and inspection device - Google Patents

Description

  The present invention relates to a bivalve inspection method and inspection apparatus capable of non-destructive inspection.

  Conventionally, in order to inspect the quality of bivalves, it is common to open bivalves and check the shells in the shells directly with the naked eye, or touch the shells directly. In addition to the disadvantage that the inspected bivalve can not be made into a product, there is a disadvantage that a process (work) for opening the bivalve is required.

As an improvement of these drawbacks, the bivalve is irradiated with light containing infrared rays, and the spectrum of transmitted light transmitted through the bivalve is detected in the irradiated light, and the second derivative (2 The bivalve inspection shown in Patent Document 1 that performs non-destructive inspection on the quality of the bivalve, etc. by performing the second order differentiation) process and paying attention to the fact that the discrimination graph obtained by the second order differential process differs depending on the quality of the bivalve Methods are known.
Japanese Patent Laid-Open No. 10-229776

However, the bivalve inspection method of the above document has a problem that the process becomes complicated because it is necessary to perform second order differentiation (second order differentiation) in a predetermined wavelength range in the spectrum in order to obtain a discrimination graph. It is not disclosed how to identify the quality of the bivalve using the above discrimination graph, so even if the operator can directly determine the quality of the bivalve by looking at the above discrimination graph, When trying to automatically execute it on a computer such as a microcomputer, a problem remains.
The present invention solves the above-mentioned problems and makes it easy to automatically discriminate the quality by a control unit such as a computer when performing a non-destructive inspection of a bivalve, and the process of the bivalve has been simplified. An object is to provide an inspection method and an inspection apparatus.

In order to solve the above problems, the present invention first receives an irradiation unit 6 that irradiates a bivalve with light containing infrared rays, and transmits light transmitted through the bivalve or reflected light reflected from the bivalve in the irradiated light. A light receiving unit 7 for detecting light, a first detection unit 8 for detecting a first intensity of a predetermined wavelength component in a range of 1040 to 1140 nanometers in transmitted light or reflected light received by the light receiving unit 7, and the light receiving unit 7 The second detection means 9 for detecting the second intensity, which is the predetermined wavelength component intensity in the range of 1150 to 1370 nanometers, in the transmitted light or reflected light received by the light source, and the first detection means 8 and the second detection means 9 are input. A control unit 11 connected to the side, and the irradiation unit 6 is configured to irradiate light including a wavelength component in a range of 900 to 1600 nm, and the control unit 11 has a first intensity from the first detection unit 8 and Second inspection It is characterized by determining the quality of the bivalve by comparing the second intensity from the means 9.

  Secondly, the control unit 11 calculates the ratio of the first strength and the second strength, so that there is no shell in the shell and a good shell with a predetermined amount of shellfish in the shell. And the mud shells in which mud is mixed in the shells.

  Third, the first detection means 8 or the second detection means 9 includes a bunt pass filter 36 that allows light of a predetermined wavelength to pass therethrough, and transmitted light or reflected light received by the light receiving unit 7 via the bunt pass filter 36. The first intensity or the second intensity is detected by extracting the selection light having a predetermined wavelength component from and detecting the intensity of the selection light.

Fourth , the bivalve is irradiated with light containing infrared rays having a wavelength component in the range of 900 to 1600 nm, and the transmitted light that has passed through the bivalve or the reflected light that is reflected from the bivalve is received and received. A first intensity that is an intensity of a predetermined wavelength component in a range of 1040 to 1140 nanometers in transmitted light or reflected light, and a predetermined wavelength component in a range of 1150 to 1370 nanometers in transmitted light or reflected light received by the light receiving unit. It is characterized by inspecting the quality of the bivalve by comparing it with the second strength, which is strength.

  According to the bivalve inspection method and inspection apparatus of the present invention configured as described above, the control unit has a first intensity that is an intensity of a predetermined wavelength component in a range of 1040 to 1140 nanometers in transmitted light or reflected light, and In order to discriminate the quality of the bivalve shell by comparing it with the second intensity which is the intensity of the predetermined wavelength component in the range of 1150 to 1370 nanometers in the transmitted light or reflected light, it is necessary to perform complex processing such as second order differentiation There is an effect that the process is simplified and it becomes easy to automatically determine the quality by a control unit such as a computer.

  In the bivalve inspection method of the present invention, the quality or the like of the bivalve is discriminated by utilizing the property that the substance absorbs light in a predetermined wavelength range well depending on its properties. Specifically, the wavelength range in which the bivalve shows high transmittance is determined by irradiating the bivalve with light and analyzing the spectrum of transmitted light transmitted through the bivalve or reflected light reflected from the bivalve. I can know. A halogen lamp 1 (see FIG. 5) is used as the light source.

  FIG. 1 is a characteristic graph showing the spectrum of a halogen lamp. As shown in the figure, the light from the halogen lamp 1 contains a lot of infrared rays in addition to visible rays. In addition, the intensity | strength of the vertical axis | shaft of the same figure shows light quantity, and it means that it has much light which has the wavelength (frequency), so that this intensity | strength is high.

  The light from the halogen lamp 1 is divided into empty shells, which are bivalves without shells in shells, good products, which are bivalves with a sufficient amount (full) of shells, and mud and muddy water in shells. Irradiate the mud shell, which is a bivalve mixed with water, and perform spectral analysis of transmitted light. In addition, we use shijimi as bivalve.

  FIG. 2 is a characteristic graph showing the spectrum of transmitted light when a small-size empty shell, good shellfish and mud shell are irradiated with a halogen lamp, and FIG. 3 is a medium-sized empty shell and good shellfish. FIG. 4 is a characteristic graph showing the spectrum of transmitted light when a halogen lamp is irradiated on a mud shell, and FIG. 4 shows the transmission when a halogen lamp is irradiated on a large-sized empty shell, a good shellfish and a mud shell. It is a characteristic graph which shows the spectrum of light.

  The bivalve shells of different sizes are different in strength because the shell thickness and shell thickness are different. On the other hand, the bivalve shells of different sizes have the same intensity at around 1300 nm compared to the intensity at around 1100 nm, but the transmitted light from non-defective shells differs from the intensity around 1100 nm. The intensity of light at a wavelength near 1300 nm is greatly reduced, and the intensity of transmitted light of the mud shells shows substantially the same characteristics in that the intensity does not change so much depending on the wavelength component and decreases throughout the entire area.

Then, in the characteristic graph of FIG. 2-4, a wavelength in the range of 1040~1140nm the first wavelength lambda _a, if a wavelength in the range of 1150~1370nm is a second wavelength lambda _b, the first wavelength component in the transmitted light a first intensity I _a is the intensity of the ratio of the second intensity I _b is the intensity of the second wavelength component in the transmitted light, without being subjected to little effect on the size of the bivalve, be within a predetermined range However, it became clear as a result of the present inventors' sharp examination.

For example, when the first wavelength λ _a is set near 1080 nm and the second wavelength λ _a is set near 1280 nm, the value of I _b / I _a indicating the ratio between the first intensity I _a and the second intensity I _b If it is greater than 0.9, it can be determined that it is an empty shellfish, and if it is less than 0.7, it can be determined that it is a good shellfish, or is it greater than 1.0? Or it can be judged that it is a mud shellfish when 1st intensity | strength Ia is _a value smaller than _a measurement limit. In the present invention, the bivalve is inspected by discriminating the quality by identifying whether the bivalve is an empty shell, a good shell, or a mud using the above principle.

  By the way, the features as described above constitute the majority of shellfish in bivalve shells, with calcium carbonate, which is the main component of a pair of shells in shijie, exhibiting high transmittance for light having a wavelength of 600 to 2000 nm. This is due to the fact that water that absorbs light having a wavelength in the vicinity of 980, 1200, 1450, and 1950 nm well, and the characteristics of these two points are common to bivalves other than stigma. For this reason, even when inspecting bivalve molluscs other than shijimi, it is possible to discriminate quality according to the same theory.

  In addition to the halogen lamp 1, a similar effect can be expected as long as it is a light source (for example, an infrared lamp, a high-intensity LED, etc.) that can emit light having a high intensity in a wavelength component in the range of 900 to 1600 nm.

  Furthermore, even when using the spectrum of reflected light instead of the transmitted light of bivalves, the intensity characteristics of reflected light are similar to the intensity characteristics of transmitted light in that it depends on what kind of light the bivalve absorbs, The same effect as described above can be expected.

  As described above, the bivalve inspection method of the present invention irradiates the bivalve with light containing infrared rays, and receives the transmitted light transmitted through the bivalve or the reflected light reflected from the bivalve in the irradiated light, and the received transmitted light or The quality inspection of the bivalve is performed by comparing the first intensity and the second intensity in the reflected light.

Next, based on FIG. 5 thru | or 9, the test | inspection apparatus which test | inspects a bivalve using the said characteristic is demonstrated.
FIG. 5 is a simplified diagram of an inspection apparatus to which the present invention is applied. The inspection apparatus reliably positions a bivalve supply device (device unit) 2, an inspection table 3 on which the bivalve is placed, and a bivalve supplied from the supply device 2 at a predetermined position of the inspection table 3. Guide body 4, irradiation device (irradiation unit) 6 that irradiates light that satisfies the above-described conditions from the lower surface side of the bivalve, light receiving unit 7 that receives transmitted light that has passed through the bivalve, and transmitted light that is received by the light receiving unit 7. From the first intensity detecting device (first detecting means, first intensity detecting unit) 8 for detecting the first intensity after the first wavelength is separated from the first light, and the transmitted light received by the light receiving unit 7, the second described above. A second intensity detecting device (second detecting means, second intensity detecting unit) 9 for detecting the second intensity after spectrally separating the wavelength, and the first intensity detecting device 8 and the second intensity detecting device 9 on the input side A microcomputer or personal computer that is connected and automatically performs bivalve quality discrimination A control device (control unit) 11 comprising a computer, a discharge device 13 for discharging defective products such as empty shells and mud shells to a defective product box (defective product storage unit) 12 based on the determination result of the control device 11, And a non-defective box (non-defective container) 14 for storing non-defective shells and the like.

  As shown in FIGS. 5 and 6, the supply device 2 transports the bivalve from the hopper 16 capable of simultaneously loading a plurality of bivalves, the supply rail 17 that conveys the bivalve from the hopper 16 to the downstream side, and the supply rail 17. It has conveyance rails (aligned rails) 18 that are conveyed in a row in the direction to the inspection table 3, and vibration motors (conveyance motors) 19 and 21 that are respectively installed on the supply rail 17 and the conveyance rail 18.

  The supply rail 17 is inclined downward in the transport direction. The vibration motor 19 is attached and fixed to the lower surface side of the supply rail 17 by a fixing member 22, and vibration in the transport direction is applied to the supply rail 17 by a rotating body 23 that is always driven to rotate by the vibration motor 19. The bivalve is conveyed downstream by the inclination and vibration.

  The transport rail 18 is inclined downward in the transport direction. The vibration motor 21 is attached and fixed to the lower surface side of the transport rail 18 by a fixing member 22, and vibration in the transport direction is applied to the transport rail 18 by a rotating body 23 that is always driven to rotate by the vibration motor 21. The bivalve is conveyed downstream by the inclination and vibration.

  Further, the transport rail 18 is formed so as to be narrower than the supply rail 17 and to be inclined downward in the orthogonal (crossing) direction with respect to the transport direction. For this reason, the bivalves are conveyed to the inspection table 3 side while being lined up in the conveyance process.

  As shown in FIG. 5, the inspection table 3 is formed in a substantially circular shape in plan view, and is rotationally driven by a stepping motor (inspection table driving means, inspection table motor) 24 installed at the center. The upper surface of the circular inspection table 3 is formed substantially horizontally, and a plurality of mounting plates 26 for mounting bivalve shells are installed and fixed at equal intervals on the periphery of the upper surface. In addition, the upper surface of the mounting plate 26 is formed in a concave shape so that the bivalve can be positioned.

  The inspection table motor 24 has a stop pattern for temporarily stopping the mounting tray 26 at the irradiation position where the irradiation device 6 emits light by intermittently rotating the inspection table 3 clockwise in FIG. The moving pattern for moving the next mounting tray 26 adjacent to the mounting tray to the irradiation position is alternately repeated. This control is executed by the control device 11.

  As shown in FIGS. 5 and 7, the guide body 4 includes a plate frame 27 having a substantially circular shape in plan view, and guide wings 28 integrally extending downward and outward from the center of the lower surface of the plate frame 27. It is rotated by a stepping motor (guide body driving means, guide body motor) 29. A plurality of guide wings 28 are provided at equal intervals, and the adjacent guide wings 28 form a wedge shape in plan view. And the bivalve from the conveyance rail 18 is guided to the mounting plate 26 of the inspection table 3 by the two guide wings 28.

  The guide body motor 29 guides one bivalve shell fed from the transport rail 18 to the mounting plate 26 by stopping driving in conjunction with the stop pattern of the inspection table motor 24, and also performs the inspection described above. By being driven in conjunction with the movement pattern of the table motor 24, the state is switched so that the bivalve fed next to the bivalve can be guided to the next placing plate 26. This timing control is executed by the control device 11.

  The irradiation device 6 includes the above-described halogen lamp 1 or a light source equivalent thereto, and a light guide line 31 that guides light from the halogen lamp 1 or the like to the irradiation location, and irradiates light on the bivalve that is sequentially sent. It is configured. The light guide line 31 is formed by bundling a plurality of optical fibers.

  As shown in FIGS. 5 and 8, the light receiving unit 7 is formed on one end side of a light guide line 32 having substantially the same configuration as the light guide line 31 described above. Light from an irradiation location located on the lower surface side of the mounting tray 26 passes through the bivalve directly or through the vertical irradiation hole 26a formed in the mounting tray 26, and is guided from the light receiving unit 7 to the light guide line 32. And is distributed to the second intensity detecting device 8 and the second intensity detecting device 9 provided on the other end side of the light guide line 32.

  As shown in FIGS. 5 and 8, the first intensity detection device 8 and the second intensity detection device 9 are respectively a light distribution lens 33 that linearly distributes light diffused from the other end of the light guide line 32. A condensing lens 34 for condensing the light distributed by the light distribution lens 33, a bandpass filter (spectral means, spectroscopic unit, filter) 36 for filtering light of a predetermined wavelength from the collected light, and a band A photodiode (light receiving element) 37 that receives the selection light extracted by the filtering of the pass filter 36 is provided.

  The bandpass filter 36 of the first intensity detection device 8 takes out selective light having a first wavelength (1080 nm in this embodiment), and the bandpass filter 36 of the second intensity detection device 9 has a second wavelength (this embodiment). Then, selective light having 1280 nm) is taken out. In addition, the photodiode 37 is configured to output a voltage corresponding to the intensity of the selected light. This voltage signal is an intensity signal indicating the intensity of the selected light. This intensity signal is amplified by an operational amplifier (amplifier) 38 and sent to the control device 11 side.

  As shown in FIG. 5, the discharge device 13 includes a nozzle (injection unit) 39 for discharging air, a compressor 41, and a solenoid valve (discharge device) installed in the middle of the air flow path from the compressor 41 to the nozzle 39. Drive means) 42. The solenoid valve 42 is opened by the control device 11 when the control device 11 determines the defective product, and injects air from the nozzle 39 toward the bivalve on the mounting plate 26 sent from the irradiation location. The defective product is blown off to the defective product rail 43 side. The bivalve on the defective product rail 43 slides down on the defective product rail 43 and is accommodated in the defective product box 12.

  The bivalve (non-defective product) on the mounting plate 26 that has passed the injection point of the nozzle 49 is guided to the non-defective product rail 46 by the guide plate 44. The bivalve on the non-defective rail 46 slides on the non-defective rail 46 and is accommodated in the non-defective box 14.

  As shown in FIGS. 5 and 9, the control device 11 includes an AD converter 47 that converts the intensity signals, which are analog signals from the first intensity detection device 8 and the second intensity detection device 9, into digital values, respectively, Two motor drivers 48 and 49 for controlling the two stepping motors 24 and 29 and an IO port 52 to which a relay circuit (operation circuit) 51 for operating the solenoid valve 42 is connected are provided. That is, the first intensity detecting device 8 and the second intensity detecting device 9 are connected to the input side of the control device 11, while the two stepping motors 24 and 29 and the solenoid valve 42 are connected to the output side.

  And based on the value of the 1st intensity | strength and 2nd intensity | strength from an input side, based on the above-mentioned method, quality discrimination | determination is performed to a bivalve, and the discharge apparatus 13 is controlled based on this discrimination | determination result. In addition, the intermittent drive control as described above is always performed on the inspection table 3 and the guide body 4 via the two stepping motors 24 and 29. Incidentally, the control device 11 performs quality discrimination processing even when there is no bivalve at the irradiated location, and detects that the input first intensity and second intensity are not attenuated, so that there is no bivalve at the irradiated location. Configured to identify that.

  Note that the above determination is made only when a passage sensor (passage detection means) 53 connected to the IO port 52 (input side) of the control device 11 is installed in the vicinity of the irradiation location, and there is a bivalve in the irradiation location by the passage sensor 53. The control device 11 may be configured to perform processing.

Next, a different embodiment of the bivalve inspection apparatus of the present invention from the above-described example will be described.
It is a schematic diagram which shows another embodiment of the inspection apparatus of the bivalve of this invention. An irradiation location may be formed on the upper side of the bivalve, the first intensity and the second intensity may be detected by reflected light from the bivalve, and the quality determination process of the bivalve may be performed based on the detected value.

Next, a different embodiment of the bivalve inspection apparatus of the present invention from the above-described example will be described.
FIGS. 11A and 11B are simplified views showing different embodiments of the bivalve inspection apparatus of the present invention. As shown to the figure (A), while forming the irradiation location of the irradiation apparatus 6 on the conveyance path 54 inclined downward toward the bivalve conveyance direction, the light-receiving part 7 may be arrange | positioned. Then, the nozzle 39 may be disposed on the downstream side of the irradiation location, and the passage sensor 53 may be disposed on the upstream side, and the bivalve inspection may be executed. In this case, a bivalve that slides down the conveyance path 54 becomes a non-defective product, and a bivalve blown off by air becomes a defective product. In this way, the inspection table 3 and the guide body 4 can be omitted, and the inspection apparatus can be configured simply.

  Further, as shown in FIG. 5B, by arranging the irradiation device 6, the light receiving unit 7, the nozzle 39, and the passage sensor 53 having substantially the same arrangement in FIG. The configuration of the inspection apparatus may be configured. In this case, a non-defective box 14 may be provided on the most downstream side of the conveyance.

It is a characteristic graph which shows the spectrum of a halogen lamp. It is a characteristic graph which shows the spectrum of each transmitted light at the time of irradiating a small-sized empty shellfish, a good-quality shellfish, and a mud shellfish with a halogen lamp. It is a characteristic graph which shows the spectrum of each transmitted light at the time of irradiating a hollow lamp, a good-quality shellfish, and a mud shellfish of medium size with a halogen lamp. It is a characteristic graph which shows the spectrum of each transmitted light at the time of irradiating a large-sized empty shellfish, a good-quality shellfish, and a mud shellfish with a halogen lamp. It is a simplified diagram of an inspection device to which the present invention is applied. (A) is a perspective view of supply device 2, (B) and (C) are the front views and side views of a vibration motor. It is a principal part perspective view which shows the structure of a guide body. It is a conceptual diagram which shows the structure of a 2nd intensity | strength detection apparatus and a 2nd intensity | strength detection apparatus. It is a block diagram which shows the structure of a control apparatus. It is a schematic diagram which shows another embodiment of the inspection apparatus of the bivalve of this invention. (A) And (B) is a simplified diagram which shows another embodiment of the inspection apparatus of the bivalve of this invention, respectively.

Explanation of symbols

6 Illumination device (irradiation unit)
7 light receiving unit 8 first intensity detecting device (first detecting means, first intensity detecting unit)
9 Second intensity detection device (second detection means, second intensity detection unit)
11 Control device (control unit)
36 Bandpass filter (spectral means, spectroscopic part, filter)

Claims (4)

An irradiation unit (6) for irradiating light including infrared rays to the bivalve, a light receiving unit (7) for receiving transmitted light transmitted through the bivalve or reflected light reflected from the bivalve, and the light receiving unit (7 The first detection means (8) for detecting the first intensity, which is a predetermined wavelength component intensity in the range of 1040 to 1140 nanometers, in the transmitted light or reflected light received in (1), and the transmitted light received by the light receiving section (7) Alternatively, a second detection means (9) for detecting a second intensity which is a predetermined wavelength component intensity in the range of 1150 to 1370 nanometers in the reflected light, and the first detection means (8) and the second detection means (9) A control unit (11) connected to the input side, the irradiation unit (6) is configured to irradiate light including a wavelength component in the range of 900 to 1600 nm, and the control unit (11) is a first detection unit. With the first intensity from (8) Inspection apparatus bivalves to determine the quality of the bivalve by comparing the second intensity from the second detecting means (9).   The control unit (11) calculates the ratio between the first strength and the second strength, so that the bivalve shell has no shell in the shell, the non-defective shellfish having a predetermined amount of shellfish in the shell, The bivalve inspection device according to claim 1, wherein the apparatus is distinguished from mud shells in which mud is mixed in the shells.   The first detection means (8) or the second detection means (9) includes a bunt pass filter (36) that allows light of a predetermined wavelength to pass through, and is received by the light receiving unit (7) via the bunt pass filter (36). The bivalve inspection apparatus according to claim 1 or 2, wherein the first intensity or the second intensity is detected by extracting the selection light having a predetermined wavelength component from the transmitted light or the reflected light and detecting the intensity of the selection light. The bivalve is irradiated with light containing infrared rays having a wavelength component in the range of 900 to 1600 nm, the transmitted light transmitted through the bivalve or the reflected light reflected from the bivalve is received, and the transmitted light or reflection received. The first intensity, which is the intensity of a predetermined wavelength component in the range of 1040 to 1140 nanometers in the light, and the intensity of the predetermined wavelength component in the range of 1150 to 1370 nanometers in the transmitted light or reflected light received by the light receiving unit. A bivalve inspection method that inspects the quality of bivalves by comparing two strengths.

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