JPS647335B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a crack detection device for rice grains that detects cracks (body cracks) that occur in rice grains such as unhulled rice, brown rice, and white rice, and counts the number of grains. .

Conventional technology The conventional method for detecting cracked grains in rice grains is to arrange the rice grains on a translucent window of a perforated plate, shine light onto the window from below, and count the translucent pattern on the eye side to determine the number or ratio of cracked rice grains. A primitive means of calculating was used, and the work was cumbersome and sloppy.

In addition, Japanese Patent Application Laid-Open No. 55-39001 proposes a device that detects deformation of the shape of the capsule, dirt, etc. by projecting light from a lamp onto the capsule and receiving the reflected light beam with a light-receiving element. but,
Because this device uses reflected light from the capsule, it cannot detect abnormalities inside the capsule, nor can it tell the total number of items and the number of abnormal items.

Problems to be Solved by the Invention The present invention provides a rice grain crack detection device that is capable of detecting cracks existing inside rice grains and counting the number of cracks and the total number of grains with high precision. The purpose is to

Means for Solving the Problems The apparatus for detecting cracks in rice grains of the present invention includes a light source placed on one side of the plate and a plurality of light-receiving elements placed on the other side of the plate, sandwiching a transparent window opened in the plate. The light-receiving element has its optical axis directed to both front and back sides of the center of the transparent window, and also includes a crack grain detection circuit that detects crack grains by comparing the difference in the amount of light received with a reference limit value, and a total number of grains. The cracked grain detection circuit is connected to a split grain counter circuit, and the total grain number detection circuit is connected to a total grain number counter circuit.

Embodiment In FIG. 1, reference numeral 10 is a box-shaped machine frame, and the machine frame 10
A rice feeding gutter 12 equipped with a vibrating device 11 is mounted on the upper side of the rice feeding gutter 12 in a gently inclined manner, and a supply hopper 14 is mounted on the upper part of the receiving part 13 on the feeding side, and the end of the gutter on the discharge side is connected to the machine frame wall. A light source 7 consisting of an incandescent bulb or the like and a pair of photo diodes of a light amount detection section 15 are installed above and below a transparent window 1 which protrudes from the opening of the rice feeding gutter 12 and is provided on the plate 9 at the bottom of the gutter 12. The light-receiving elements 5 and 6 are supported and disposed opposite to each other, and each light-receiving element 5 and 6 is connected electrically to a crack particle detection circuit 16 on the upper part of the machine frame 10. 17 is a display provided in the detection circuit 16.

Then, the rice flows down from the supply hopper 14 to the rice feeding gutter 1.
Rice grains 2 that have reached the slit-shaped transparent window 1 provided in 2
The light source 7 irradiates both the front and rear polarized parts 3 and 4 in a state of slight vibration (amplitude of about 1 mm), and the transmitted light is received by both the light receiving elements 5 and 6, respectively, and the difference in light amount is detected. The presence or absence of cracks in the rice grains is detected by comparing it with the reference limit value set in the grain detection circuit 16, and the number or ratio of cracked rice grains and non-cracked rice grains (excluding abnormal grains) is calculated and displayed on the display 17. will be displayed.

Figure 2 shows a rice grain located above the transparent window 1 and irradiated from below. The closed curve (dotted line) is rice grain 2 in unhulled rice,
Further, vertical dotted lines (thin lines) drawn in the rice grains 2 each represent a crack surface P. Also, in figure a, A
and B are respective viewpoint positions where the light receiving elements 5 and 6 face each other, and in the case of regular grains without crack surfaces, both polarized portions 3 of the rice grain 2 are received by this viewpoint position.
The light amounts (brightness) of the four cases are the same, and the difference in light amount is within the reference limit value (voltage). In the rice grain 2' in Figure b, the crack surface P is on the left side of the transparent window 1, so the transmitted light inside the grain that enters through the transparent window 1 is scattered by the crack surface P, and the grain is on the left side of the grain. The amount of light decreases, and this difference in amount of light falls outside the reference limit value. Figure C rice grain 2″
produces a bright and dark surface opposite to that of the rice grain 2', and the difference in light amount is outside the reference limit value, so that this grain is also identified as a crack grain.

Next, in FIG. 3, in the second claim, lenses 18 and 19 arranged close to the light-transmitting detection part Q of the rice grain placed on the light-transmitting window 1 are connected to glass fibers 20, 21 to the light receiving element 5,
6, and since the distance between the front and rear polarized parts of the rice grain is usually short and small, it is difficult and inconvenient to directly install both light receiving element frames in close proximity to the rice grain. By interposing the glass fiber, the gap between both light receiving elements can be freely provided.

Furthermore, in the third aspect of the present invention, the tip of the glass fiber is provided adjacent to the lower part of the transparent window 1 and communicates with the light source 7 through the lens 22, so that the light source can be directly connected. If the arrangement was done using only a lens, the required distance between the light source and the light-transmitting window would increase the overall height of the device, which would be inconvenient, but this configuration uses glass fibers to bend the light rays. This has the effect of allowing the position of the light source to be set freely and streamlining the entire device.

According to the fourth aspect of the present invention, since the transparent window 1 is opened at the bottom of the rice feeding gutter 12 which is tilted in FIG.
can be continuously supplied to the light-transmitting window 1 through the light-transmitting window 1, which has the effect of facilitating the detection work and improving the detection efficiency.

Next, in FIGS. 4 and 5, according to claim 5, a recessed portion is provided between the light receiving elements 5, 6 and the light source 7 at a predetermined position facing both the light receiving elements 5, 6. 24 and a large number of transparent windows 1 opened in the recessed portion 24 are arranged in a column on a moving plate 25, and the plate 24 runs so that the vertically arranged transparent windows 1 sequentially pass through predetermined positions. Orbit 26A, 26
B, the drive device 27
By activating the rice grains supplied to each of the translucent windows 1, the rice grains continuously and accurately reach a predetermined position to facilitate the detection operation, and each grain is positioned in a fixed posture to facilitate its detection. This has the effect of increasing accuracy.

Next, the electric circuit shown in FIG. 6 will be explained. Both light receiving elements 5 and 6 provided in the crack grain sensor section 28
is connected to the differential amplifier 31 of the crack grain detection circuit 30 via each amplifier 29, 29, and the amplifier 31
It is connected to a plurality of comparators 33 and 34 through an analog switch 32 on its output side, respectively, and its output side is connected through an OR circuit 35 to a counter circuit 36 for grain splitting. Further, the branch path 37 on the output side of the light receiving element 6 provided on one side is connected to each comparator 39, 40 of the particle sorting detection circuit 38 and the comparator 48 of the total particle number detection circuit 42, and The output sides of the circuits 39 and 40 are connected to the AND circuit 4, respectively.
1A, 41B and an AND circuit 49 provided in the total particle number detection circuit 42 via an inverter. 43, 44 are crack grain setting devices connected to the comparators 33, 34 provided in the detection circuit 30; 45, 46 are grain sorting settings devices connected to the comparators 39, 40 provided in the detection circuit 38; Further, the branch path 47 on the output side of the OR circuit 35 provided in the circuit on the crack grain side is connected via an inverter to AND circuits 41A and 41B provided in the circuit on the grain sorting side, respectively, and the AND circuits 41A and 41B The input side of the switch circuit 50 is connected to a conductor connecting the analog switch circuit 50 provided in the total particle number detection circuit 42 and the comparator 48, and the output side of the switch circuit 50 is connected to the
It is connected to a total particle number counter circuit 51 via an AND circuit 49, and each of the counter circuits 36, 5
1 are both connected to a ratio meter 52. Also,
The electric circuit shown in FIG. 7 includes a light emitting diode 53 that illuminates the grain number through hole R of the sedimentation plate 24 shown in FIGS. 4 and 5, and a photo sensor 5 that receives light.
4 is provided, and the output side of the foot sensor 54 is connected to the analog switch circuit 50 via an amplifier 55. Note that 56 is a particle detection setting device connected to the comparator 48 of the detection circuit 42.

Therefore, the light intensity detection signals of the light receiving elements 5 and 6 which have received light and dark shadows of both the polarized parts 3 and 4 of the rice grain 2 in the transparent window 1 are amplified and inputted to the split grain detection circuit 30, In the detection circuit 30, the difference in light amount is detected by the differential amplifier 31, and the detection signal is input to the analog switch 32. On the other hand, the particle detection (confirmation) signal generated by the comparator 48 on the side of the total particle number detection circuit 42 is input to the analog switch circuit 50, and the switch signal causes the analog switch 32 to The detection signal of the differential amplifier 31 is input to each comparator 33, 34, and the differential amplifier 31 is closed each time.
It is compared with a reference limit value (reference voltage - or +) set in setting devices 43 and 44 connected to 3 and 34, and the comparison signal is inputted to a shell splitting counter circuit 36 via an OR circuit 35. The number of shell-split grains is counted and displayed on the display 17. Further, the branched output from the light receiving element 6 side is inputted to each comparator 39, 40 of the particle sorting detection circuit 38, and each comparator 39, 40
The comparison signal is compared with the brightness (voltage) of immature grains/brown rice specified by setting devices 45, 46 connected to 30
High-bright brown rice from which split rice has been removed, high-bright brown rice, and high-bright immature grains are identified based on a signal that matches the branch output from the OR circuit 35 of the inverter. provided in the total grain number counter circuit 51 through
This is input to an AND circuit 49, which excludes immature grains and brown rice from the total number of grains. In addition, the comparator 48 provided in the circuit on the side of the total number of grains is connected to the circuit 49.
The detection signal is compared with the input from the particle detection setting device 56 for identifying the particles communicating with the particle selection device 56, and the detection signal is inputted to the AND circuit 49 via the analog switch circuit 50. The signals inputted from the AND circuits 41A and 41B via the inverter are compared with each other, and the matching signal is inputted to the total grain counter circuit 51, and the total number of rice grains excluding brown rice and immature grains is displayed on the display 17. , and the branch outputs of the counter circuits 36 and 51 are respectively input to a ratio meter 52.
The ratio is calculated and displayed on the display 17.

Effects of the Invention According to the present invention, since the difference in the amount of light received by a plurality of light receiving elements is compared with a reference limit value, cracks existing inside rice grains can be detected regardless of external brightness, and the number of cracked grains can be detected. It is possible to count the total number of grains with high precision.

[Brief explanation of the drawing]

The drawings are illustrations of embodiments of the present invention. Fig. 1 is a side sectional view of this device, Fig. 2 is an explanatory diagram of the bright and dark surfaces of rice grains, Fig. 3 is a side view of another embodiment of the sensor section, and Fig. 4 is an illustration of the moving plate. Enlarged sectional view,
Figure 5 is a partial plan view of the moving plate, Figures 6 and 7.
Both figures are electrical circuit diagrams. 1...transparent window, 2,2',2''...rice grain, 3...
Front polarized part, 4... Rear polarized part, 5... Light receiving element, 6...
Light receiving element, 7... Light source, 8... Gap, 9... Plate, 10... Machine frame, 11... Vibration device, 12...
Rice feeding gutter, 13... Receiving section, 14... Supply hopper, 15... Light amount detection section, 16... Crack grain detection circuit, 17... Display unit, 18... Lens, 19...
...Lens, 20...Glass fiber, 21...
Glass fiber, 22... Lens, 23... Glass fiber, 24... Recessed part, 25... Plate for movement, 26A, 26B... Orbit, 27... Drive device, 28... Crack particle sensor part , 29...
Amplifier, 30...Detection circuit, 31...Differential amplifier, 32...Analog switch, 33...Comparator, 34...Comparator, 35...OR circuit, 36...
...Counter circuit for shell-split grain, 37... Branch path, 3
8... Grain sorting detection circuit, 39... Comparator, 40
...Comparator, 41A, 41B...AND circuit, 4
2... Total particle number detection circuit, 43... Setting device, 44
... Setting device, 45 ... Setting device, 46 ... Setting device,
47...branch path, 48...comparator, 49...AND
Circuit, 50...Analog switch circuit, 51...
Counter circuit for total number of grains, 52...meter for ratio,
53...Issuing diode, 54...Foot sensor, 55...Amplifier, 56...Particle detection setting device, A, B...Viewpoint position, P...Crack surface, Q...
Translucent detection part, R...through hole for particle number.

Claims (1)

[Scope of Claims] 1. A light source is arranged on one side of the plate and a plurality of light receiving elements are arranged on the other side, sandwiching a transparent window opened in the plate, and the light receiving element is located at the center of the transparent window. The optical axes are directed to both the front and rear sides, and are connected to a crack grain detection circuit that detects crack grains by comparing the difference in the amount of received light with a reference limit value, and a detection circuit for the total number of grains. A rice grain crack grain detection device characterized in that a detection circuit is coupled to a counter circuit for split grains, and the detection circuit for the total number of grains is coupled to a counter circuit for the total number of grains. 2. The apparatus for detecting cracks in rice grains according to claim 1, wherein a lens provided close to the light-transmitting window has a tip end face of a glass fiber communicating with a light-receiving element. 3. The apparatus for detecting cracks in rice grains according to claim 1, wherein a lens provided close to the lower part of the transparent window has a tip end face of a glass fiber communicating with a light source. 4. The apparatus for detecting cracks in rice grains according to claim 1, wherein the transparent window is opened at the bottom of a tilted gutter. 5. The light transmitting windows are opened at the bottom of a recessed portion formed in a plurality of columns in the plate body, and the plate body moves on a trajectory such that the vertically arranged light transmitting windows sequentially pass between the light receiving element and the light source. The apparatus for detecting cracks in rice grains according to claim 1, which is configured to travel. 6. The plate has a particle number through hole corresponding to the transparent window, and a second light source and a second light receiving element are provided sandwiching the particle number hole, and the second light receiving element 2. The apparatus for detecting cracks in rice grains according to claim 1, further comprising an electric circuit for comparing the difference in the amount of light received by the light receiving element with a reference limit when the element senses the light from the second light source. 7. Detection of cracked grains in rice grains according to claim 1 or 6, wherein the cracked grain detection circuit is connected to a grain sorting detection circuit that excludes detected rice grains with a predetermined brightness or higher from the number of rice grains as immature grains. Device. 8. Rice grains according to claim 1, 6, or 7, in which the cracked grain detection circuit is connected to a grain sorting detection circuit that excludes detected rice grains with a brightness below a predetermined brightness from the number of rice grains as brown rice grains. Crack particle detection device.