JP4318364B2 - Powder inspection equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a supply means for supplying the granular material group so as to move down along the flow path in a single state at the upper supply position in the flow path for moving the granular material group down, and the flow path The detection means for detecting the presence or absence of a defective or normal substance in the granular material group that is moved down at the detection location in the middle of the flow, and the separation at the lower side of the detection location in the flow path Separating means for acting on the granular material group to separate normal and defective materials into different paths, and determining the necessity of separation operation of the separating means based on detection information of the detecting means. Further, the present invention relates to a granular material inspection apparatus provided with control means for controlling the separation operation of the separation means after a set time has elapsed.
[0002]
[Prior art]
In the granular material inspection apparatus, the flow path for moving the granular material group is formed by the flow guide surface of the plate-like shooter held in an oblique posture and the falling path from the lower end of the shooter. A hopper storing powder particles is provided at a supply location (specifically, the upper end of the shooter) on the upper side of the flow path, and the particles in the hopper are opened and closed by opening and closing the discharge port on the bottom side of the hopper. Supply means are provided for supplying the group to the downflow path. That is, the supply means is configured to increase or decrease the supply amount of the granular material group supplied to the flow path by changing the opening degree of the discharge port of the hopper that stores the granular material group. And it is supplied from the said supply means so that a granular material group may flow down along the flow down guide surface of the above-mentioned shooter in one layer state, and in the middle of the flow down route (specifically, in the fall route from the lower end of the shooter) In the detection location, a detection means for detecting the presence of a defective object is provided based on light reception information such as a CCD line sensor that receives reflected light or transmitted light from a granular material group illuminated by a fluorescent lamp, etc. In addition, separation means is provided that separates normal and defective items into different paths by blowing air to the defective items that flow down at the separation points located on the lower side of the detection points in the dropping path. It was.
When it is determined that the separation unit needs to be separated based on the detection information of the detection unit, the separation unit is activated after a set time has elapsed. Conventionally, the set time is determined in advance. It was fixed at a certain time. And, when the flow rate of the granular material changes with the change in the supply amount of the granular material group, the flow rate of the granular material is changed by widening the operating time width of the separation means. Regardless of, for example, defectives detected in the granular material group in which a large number of normal products are present are excluded from the granular material group so that the defective materials are reliably separated (for example, Japanese Patent Laid-Open No. 10-99797). No. publication).
[0003]
In addition, although the said granular material group of the said test | inspection is a rice grain group, such as brown rice and polished rice, and the resin pellet for shaping | molding processes, in the case of rice grain groups, such as brown rice and polished rice, normal rice grains are normal. Inferior rice grains such as colored rice and foreign matters such as stone and glass are defective. In addition, in the case of resin pellets for molding processing, the whole surface is the original color of the resin to be inspected, which is normal, and due to black burns and contamination generated in the processing process on the pellet surface Resin pellets containing contamination, resin pellets of other colors mixed in, etc. are defective.
[0004]
In addition, as a supply means for supplying the powder group to the flow path, in addition to the above-mentioned hopper type that changes the supply amount by changing the opening of the discharge port, the supply point of the flow path of the powder group For example, a supply means such as a vibration feeder or a conveyor belt type is used in which the supply rate is increased or decreased to change the supply amount.
[0005]
[Problems to be solved by the invention]
In the conventional particulate inspection apparatus, after determining whether the separation means needs to be separated based on the detection information of the detection means, the set time until the separation means is separated is set to a fixed time, The change in the flow rate of the granular material accompanying the change in the supply amount of the body group has been made to cope with a wide operating time width of the separation means, so the failure detected in the granular body group When separating the product from other granular material groups, it is possible to eliminate the defective product and ensure separation, while other normal products located away from the defective product to be excluded in the flow direction As a result, there is a problem that normal and defective products cannot be separated in a properly sorted state. In addition, when the normal product detected in the granular material group is excluded and separated from the granular material group, conversely, defective products located away from the normal material to be excluded are also excluded together, Similarly, normal products and defective products cannot be separated in a properly sorted state.
[0006]
The present invention has been made in view of the above circumstances, and its purpose is to change the flow rate of the granular material in accordance with the change in the supply amount of the granular material group in order to eliminate the problems of the conventional technology. In this case, an object of the present invention is to provide a granular material inspection apparatus capable of separating a normal product and a defective product in a properly selected state.
[0007]
[Means for Solving the Problems]
  In Claim 1, the said supply means is comprised so that the supply speed | rate with respect to the said supply location of the said granular material group can be changed in order to increase / decrease the supply amount of the said granular material group, The said control means is the said After the necessity of the separation operation of the separation means is determined based on the detection information of the detection means, the set time until the separation means is operated is changed according to the increase / decrease change in the supply speed of the supply means. Configured as,
  Manual time adjustment means for finely adjusting the set time set by the control means is provided,
  An operating time width adjustment volume for changing an operating time width for operating the separation means is provided..
  In other words, in order to increase the supply amount of the granular material group to the flow path, if the supply speed of the granular material group with respect to the supply location is increased in the supply means, the presence of a defective or normal product is detected at the detection location. , It is controlled so that the set time until the separation means is actuated after determining the necessity of separating the detected defective or normal product and other granular material group, and conversely, the granular material In order to reduce the supply amount of the group, if the supply speed of the powder particle group is reduced in the supply means, the set time is controlled to be long.
  Therefore, with the change in the supply speed of the granular material group supplied to the supply location, the flow velocity of the granular material moving down in a single layer along the flow path changes, and the granular material group is detected at the detection location. When the time for moving down to the separation location changes, the timing for operating the separating means is adjusted according to the change in the moving time, so that the operating time width of the separating means acts only on the powder to be separated. It can be set to the minimum time width so that it does not act on other powders that are located away from the powder that should act in the flow direction, and thus the supply amount of the powders can be changed. Thus, when the flow rate of the granular material changes, a granular material inspection device capable of separating the normal product and the defective product in a properly selected state is obtained.
  In addition, since the set time that is changed according to the increase / decrease change in the supply speed of the granular material group can be finely adjusted by operating the manual time adjusting means, for example, the shape of the granular material to be inspected Depending on the particle size, etc., even if the granular material group is supplied to the supply location at the same supply speed, the flow speed when moving down the flow path is different. In such a case, the time adjusting means can be manually operated to appropriately adjust the operation timing of the separating means when the granular material to be acted on flows down.
[0008]
In Claim 2, in Claim 1, the said supply means is equipped with the vibration-type conveyance body which mounts and conveys the said granular material group, By the change of the vibration amplitude of the said conveyance body, of the said granular material group It is comprised with the vibration feeder by which the said supply speed is increased / decreased.
Therefore, by increasing / decreasing the vibration amplitude of the vibratory transport body provided in the vibration feeder, the supply speed of the powder body group placed and transported by the transport body is increased / decreased to supply the powder body group. Since the amount is changed, for example, in a belt-type supply means including a belt for placing and conveying the granular material group, a belt transmission mechanism for changing the supply speed of the granular material group is complicated and expensive. However, the vibration feeder type supply means changes the vibration amplitude of the carrier by simply changing the drive voltage of the drive circuit that vibrates and drives the carrier. The feed rate can be changed, thus providing a suitable means for carrying out claim 1.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a granular material inspection apparatus according to the present invention detects a defective in a pellet group while separating and moving resin pellets as a granular material group to be inspected (hereinafter referred to as a pellet group), and performs separation processing. The case where it does is demonstrated based on drawing.
[0011]
As shown in FIG. 1 to FIG. 3 (where FIG. 3 is an explanatory diagram of the operation of detecting and separating a defective object), the wide plate-like shooter 1 is at a predetermined angle (for example, 60 degrees) with respect to the horizontal plane. ) And the pellet group k dropped from the storage tank 7 provided on the upper side of the shooter 1 is conveyed by the vibration feeder 9 to the supply point 1a at the upper end of the shooter 1 and supplied to the shooter 1. The supplied pellet group k moves down along the upper surface of the shooter 1 in a state where it is spread in the lateral direction in a single layer state. Further, in the dropping path in which the pellet group k moves and drops from the lower end of the shooter 1, a detection point J1 for detecting a defective object and a separation point J2 for separating the defective object are sequentially set. In this case, since it is intended to flow down in a single layer state, even if grains partially overlap with each other due to the flow state, a two-layer state is included in the concept of a single layer state.
[0012]
That is, the flow path IK for moving the pellet group k downward is constituted by a drop path from the upper surface of the shooter 1 and the lower end portion of the shooter 1, and the pellet group at the upper supply point 1a in the flow path IK. Supply means KK for supplying k so as to move down along the flow path IK in a single layer is constituted by the vibration feeder 9.
[0013]
The storage tank 7 stores uninspected pellets supplied from the outside, and stores normal or defective products obtained by sorting the inspection object from the outside for re-sorting. .
As shown in FIGS. 4 and 5, the storage tank 7 is formed in a tapered tube shape toward the lower end side, and a discharge port 7 </ b> A whose front side is opened is attached to the lower end portion. A rubber plate 29a covering the back side is provided to prevent the pellet group k that has fallen on the transport body 9A from bouncing off and scattering while the member having the shape of connecting the side plates 7B is screwed at the connecting portion 7B1. And a rubber plate 29b covering the front side. The upper part of the rubber plate 29a on the back side is fastened and fixed by the connecting portion 7B1, and the upper part of the rubber plate 29b on the front side is fastened and fixed by the stop plate 25. When the pellet group k is transported, the front rubber plate 29b is pushed by the pellet group k and is in a lateral state toward the front side as shown in the figure. A receiving member 30 for receiving the pellet group k supplied from the transport body 9A is attached to the upper part of the shooter 1, and this receiving member 30 is a rear side of a tapered rectangular tube that is tapered downward as viewed from the side. Is formed in an open shape.
[0014]
Then, the supply amount of the pellet group k dropped from the storage tank 7 onto the vibration feeder 9 to the shooter 1 is changed by changing the conveying speed of the pellet group k by the vibration feeder 9. That is, the vibration feeder 9 is configured to be able to change the supply speed of the pellet group k to the supply location 1a in order to increase or decrease the supply amount of the pellet group k.
[0015]
Next, the configuration of the vibration feeder 9 will be described with reference to FIGS. 4 and 5.
The vibration feeder 9 includes a vibration-type transport body 9A for placing and transporting the pellet group k falling from the storage tank 7, and the change of the vibration amplitude of the transport body 9A changes the pellet group k to the supply location 1a. The supply speed is changed. Further, a drive unit 18 is provided for driving the carrier 9A by vibration. 9 A of said conveyance bodies are formed in the box shape which opened the front and upper direction provided with the baseplate 91, the both right-and-left side plates 92, and the side plate 93 on the back side.
A pair of vertical plates 23 arranged in the front-rear direction at intervals and U-shaped in side view and a pair of vertical plates 24 in L-shape in side view arranged at intervals in the left-right direction are lattice-like in plan view. The box-shaped transport body 9A is held on the grid-like vertical plates 23 and 24, and the grid-like vertical plates 23 and 24 are on the vibration table 18a provided on the drive unit 18 side. It is fixed to.
[0016]
The drive unit 18 includes a substantially U-shaped support member 18b that supports the vibration table 18a, a pair of leaf springs 18c that elastically hold the support member 18b at the front and rear portions, and a pair of leaf springs 18c. A base portion 18d for supporting the base end portion, an electromagnetic drive coil 18e for driving the support member 18b in a front-rear direction obliquely upward, and the like are provided. In addition, the vibration feeder 9 is installed on the horizontal frame F5 which comprises a machine frame via the four coil springs 27 provided in the front and rear, right and left locations (refer FIG. 1).
[0017]
When the drive voltage of the electromagnetic drive coil 18e driven at a set frequency (for example, the frequency of a commercial power supply) is changed, the vibration amplitude of the vibration table 18a is changed and fixed on the vibration table 18a. The vibration amplitude of the carrier 9A is changed, and the supply speed of the pellet group k to the supply location 1a is changed. And if the cross-sectional area (product of layer thickness and width) of the pellet group k mounted and conveyed by the conveyance body 9A is multiplied by the supply speed of this pellet group k, the pellet supplied with respect to the said supply location 1a The supply amount per unit time of the group k is obtained. In this case, since the sectional area of the pellet group k is constant, the supply rate to the supply location 1a increases as the supply amount of the pellet group k increases (see FIG. 9).
[0018]
As shown in FIG. 2, as the illumination means 4 that illuminates the detection point J1 in the middle of the flow-down path IK, a front side linear light source 4B that illuminates the front side (left side in FIG. 2), and the rear side (FIG. 2) And a rear-side line light source 4A that illuminates the right side in FIG. 2, and the front-side line that receives the reflected light reflected from the front side of the pellet group k at the detection location J1 by the illumination light from the front-side line light source 4B. A sensor 5B and a rear-side line sensor 5A that receives the reflected light reflected from the rear surface side of the pellet group k at the detection location J1 by the illumination light from the rear-surface-side linear light source 4A are provided.
As shown in FIG. 7, both the line sensors 5A and 5B have a range p smaller than the size of each pellet k of the pellet group (for example, about 1/10 of the size of the pellet k) as each light receiving target range. The plurality of light receiving elements 5a are arranged in a line in correspondence with the linear detection point J1. Specifically, each of the line sensors 5A and 5B includes a monochrome type CCD sensor unit 50 in which the light receiving elements 5a are arranged in a straight line, and an image of the pellet group k at the detection location J1. And an optical system 51 that forms an image on 5a.
[0019]
From the normal part of the pellet group k illuminated by the front-side line light source 4B and illuminated by the front-side line light source 4B in the light receiving direction of the front-side line sensor 5B and at the back side of the detection location J1. A front-side reflecting plate 8B having a long belt-like front-side reflecting surface hb for projecting light having the same or substantially the same brightness as the reflected light toward the front-side line sensor 5B is provided. Moreover, it is normal among the pellet groups k illuminated by the rear surface side line light source 4A by being illuminated by the rear surface side line light source 4A in the light receiving direction of the rear surface side line sensor 5A and at the back portion side of the detection portion J1. A rear-surface-side reflecting plate 8A having a long belt-like rear-surface-side reflecting surface ha for projecting light having the same or substantially the same brightness as the reflected light from the object toward the rear-surface line sensor 5A is provided.
[0020]
The front-side reflecting plate 8B and the rear-side reflecting plate 8A are formed in an elongated shape with an L-shaped cross section, and are attached to the light source supporting frame 22 by a similar structure. In other words, the bracket 22a, which has a U-shaped cross section and is formed in an elongated shape, is screwed and fixed to the light source support frame 22, and the bracket 22a has a corner on the opposite side of the fixing portion to the frame 22. Each reflector 8A, 8B is screwed to the bracket 22a with the corners of each reflector 8A, 8B applied.
[0021]
The front-side line light source 4B, the front-side line sensor 5B, and the rear-side reflecting plate 8A are housed in one housing portion 13B, and the rear-side line-shaped light source 4A, the rear-side line sensor 5A, and the front-side reflecting plate 8B are housed in the other housing. It is stored in the part 13A. Both storage portions 13A and 13B are formed as a single box with a common side plate, and each of the storage portions 13A and 13B is for light transmission made of a transparent glass plate on the side facing the detection point J. Window portions 14A and 14B are provided. Although not shown, a cleaning nozzle 26 is provided for blowing air along the longitudinal direction (perpendicular to the paper surface of FIG. 2) on the surfaces of the window portions 14A and 14B to remove dust and the like adhering to the window surface. (See FIG. 6).
[0022]
Corresponding to the defect g detected at the detection location J1 (for example, the resin pellet containing the black burn or contamination) flowing down to the separation location J2 on the lower side of the detection location J1. In addition, an air blowing device 6 is provided for blowing air to the defective g and separating it from the normal movement direction of the pellets k. The air blowing device 6 allows a plurality of air injection nozzles 6a to be connected to the flow path IK. The spray nozzle 6a of the section where the defective product g exists is operated by juxtaposing the entire width in a state corresponding to each section formed by dividing into a plurality of sections with a predetermined width. In other words, the air blowing device 6 includes the separating means 102 that acts on the pellet group k moved down at the separation point J2 and separates the normal product and the defective product g into different paths. Yes.
[0023]
Then, a non-defective receiving port 2B that collects normal pellets k that are traveling as they are without being blown with air from the injection nozzle 6a, and a horizontal direction from the flow of normal pellets k that are blown with air. A defective product receiving portion 3B for collecting the separated defective product g, and a non-defective product receiving portion 2B is formed in an elongated cylindrical shape in the width direction, around the non-defective product receiving portion 2B. A receiving port 3B for a defective object is formed so as to surround it. Note that the pellets k collected at the accepting port 2B for non-defective products and the defectives collected at the accepting port 3B for defective items are stored in the storage tank 7 of this inspection apparatus for re-sorting and the like. Or it is conveyed to another inspection apparatus.
[0024]
Next, the apparatus configuration of the granular material inspection apparatus will be described.
As shown in FIG. 1, vertical frames F2, F3, and F4 standing on a bottom plate F1 having jack bolt type legs F0 are connected by horizontal frames F5, F6, and F7 to form a machine frame. ing. A console 21 for displaying and inputting information is installed on the upper oblique portion of the vertical frame F4 on the front side, the vibration feeder 9 is installed on the horizontal frame F5, and the power box 17 and the air tank 15 are installed on the bottom plate F1. And are installed. Note that pressurized air is supplied from the air tank 15 to the air blowing device 6 and the cleaning nozzle 26. The box-shaped storage portions 13A and 13B are supported by the vertical frame F4 on the front side and the vertical frame F3 on the rear side, and the chute 1 is supported by the horizontal frame F6 on the upper side and the storage portion 13B on the lower side. The control box 16 is installed on the horizontal frame F7. A cover 12 that covers the outer surface of the apparatus is attached to the machine frame. Note that the cover upper portion 12A of the cover 12 on the front side of the apparatus is configured to be openable in the vertical direction, and the inside of the apparatus is inspected while the cover upper section 12A is lifted.
[0025]
The control configuration will be described. As shown in FIG. 6, a microcomputer-based control device 10 is provided. In this control device 10, each image signal from both line sensors 5A and 5B and an operation from the console 21 are provided. Information is entered. On the other hand, the control device 10 turns on and off the display drive signal for the console 21, the drive signal for the lighting circuit 19 for lighting the line light sources 4A and 4B, and the air supply to the injection nozzles 6a. A drive signal for the plurality of solenoid valves 11, a drive signal for the feeder drive circuit 20 of the vibration feeder 9, and a drive signal for the electromagnetic valve 26 </ b> A for turning on / off the air supply to the cleaning nozzle 26 are output.
[0026]
And the detection means 100 which detects the presence or absence of the defect in the pellet group k moved down at the said detection location J1 is comprised using the said control apparatus 10 and both said line sensors 5A and 5B.
That is, the control device 10 receives the reflected light from the front side and the rear side of the pellet group k and the reflected light from the front and rear reflection surfaces ha and hb. Based on the light reception information, if any of the lightness information from each of the plurality of light receiving elements 5a is out of the appropriate lightness range corresponding to the normal object, the presence of a defective object is determined. The appropriate brightness range is the appropriate brightness range ΔE2 with respect to the reflected light when a normal object in the pellet group k is illuminated by the front line light source 5B, and the normal object in the pellet group k to the rear line light source 5A. Is set as an appropriate brightness range ΔE1 for the reflected light when illuminated. And the control apparatus 10 discriminate | determines whether the brightness from the front side light-receiving part 5a2 deviated from the appropriate brightness range (DELTA) E2 set about the reflected light of the front side based on the light reception information of the front side line sensor 5B. At the same time, based on the light reception information of the rear side line sensor 5A, it is determined whether or not the brightness from the rear side light receiving part 5a1 is out of the appropriate brightness range ΔE1 set for the reflected light on the rear side. The presence of the defect g is detected when the brightness from 5a2 is outside the proper brightness range ΔE2 or when the brightness from the rear-side light receiving unit 5a1 is outside the proper brightness range ΔE1.
[0027]
Next, the detection of defectives in the light receiving outputs of the line sensors 5A and 5B will be described in detail. As shown in FIG. 8, the output voltage corresponding to the amount of light received by each light receiving element 5a is appropriate for the pellet group k. The presence of a normal pellet is detected when it is within the brightness range ΔE1, ΔE2, and the presence of a defective pellet is detected when it is outside the proper brightness range ΔE1, ΔE2. In the figure, e0 is the output voltage level for standard reflected light from normal pellet grains.
When the output voltage of the light receiving element 5a is smaller than the appropriate brightness range ΔE1, ΔE2, e1 and e2 are defective pellet grains having a reflectance lower than that of normal pellet grains (for example, due to the black burnt portion or contamination). In the case where e3 is larger than the appropriate brightness range ΔE1, ΔE2, the resin pellets of other colors having a reflectance higher than that of the normal pellet grain k (for example, the brightness is high). It is detected that a white resin pellet is present as a defective product.
[0028]
Further, the necessity of the separation operation of the air blowing device 6 is determined using the control device 10 based on the detection information of the detection means 100, and the separation operation of the air blowing device 6 is performed after the set time T1 has elapsed. Control means 101 is configured to control the above. Specifically, the injection nozzle 6a corresponding to the position of the defective g is operated. And after this control means 101 discriminate | determines the necessity for the separation operation of the said air spraying apparatus 6 based on the detection information of the said detection means 100, the said setting time T1 until operating the said air spraying apparatus 6 is the said The length of the vibration feeder 9 is changed according to the increase / decrease change of the supply speed with respect to the supply location 1a.
[0029]
Next, a specific configuration of the control unit 101 will be described.
As shown in FIG. 9, when the supply rate by the vibration feeder 9 is changed in order to change the supply amount of the pellet group k, the pellet group at the starting end portion (upper end portion of the shooter 1) of the flow path IK. The initial speed Vs of k changes. That is, when the supply speed is increased, the initial speed Vs is increased, and when the supply speed is decreased, the initial speed Vs is decreased. Then, as shown in FIG. 10, the pellet group k that started to flow down at the initial speed Vs is accelerated while flowing down to the lower end of the shooter 1, and the final speed Ve at the lower end of the shooter 1 is the initial speed Vs. Increases in proportion to
In FIG. 10, the pellet group k of the initial speed Vs0 reaches the lower end of the shooter 1 after t0 hours and is accelerated to the final speed Ve0, and the pellet group k of the initial speed Vs1 reaches the lower end of the shooter 1 after t1 hours. Although the acceleration to the speed Ve1 is shown, since the length of the shooter 1 is constant, it is surrounded by an oblique straight line connecting the initial speed Vs and the final speed Ve, a horizontal axis (time axis), and left and right vertical lines. The area of the portion (the initial speed Vs0 is indicated by hatching) becomes the same as the initial speed Vs changes.
[0030]
Therefore, as shown in FIG. 11, the larger the supply rate of the pellet group k (that is, the supply amount of the pellet group k), the shorter the set time T1 is set. ) Is stored in advance in the control device 10 as a data table. On the other hand, as shown in FIG. 6, the console 21 is provided with a supply amount adjustment volume 31 for inputting information for changing the supply amount of the pellet group k to the control device 10, and this supply amount adjustment volume 31. Is operated, the driving voltage of the vibration feeder 9 is changed to change the supply speed (supply amount) of the pellet group k, and the set time T1 is changed based on the data table. Yes. In FIG. 12, the separation operation timing at which the injection nozzle 6a is operated after the set time T1 from the timing when the detection unit 100 detects a defective object, when the supply amount of the pellet group k is large and when the supply amount is small. Is illustrated.
[0031]
Further, as shown in FIG. 6, the console 21 is provided with a time adjustment volume 32 and an operation time width adjustment volume 33, and information on both volumes 32 and 33 is input to the control device 10. Yes. The time adjustment volume 32 constitutes time adjustment means for finely adjusting the set time T1 set by the control means 101. That is, as shown in FIG. 12, the set time T1 can be lengthened or shortened within the adjustment range T3 by operating the time adjustment volume 32.
[0032]
Further, by operating the operation time width adjustment volume 33, the operation time width T2 for operating each of the injection nozzles 6a can be changed. Hereinafter, the method for adjusting the operating time width will be described with reference to FIG.
First, when the supply amount of the pellet group k is changed in a state where the operation time width T2 is slightly increased and the set time T1 is fixed, the supply amount is plotted on the horizontal axis and the defect rejection rate is plotted on the vertical axis. 1, one curve h1 having a peak rejection value is obtained. That is, when the time for moving down from the detection location J1 to the separation location J2 at the flow rate determined by the supply rate (supply amount) of the pellet group k coincides with the set time T1 and is close to the set time T1. The above peak value is obtained. In the figure, the reject rejection rate has a peak value (100 percent) in the range of the supply rate centered on the supply rate i1. The defective rejection rate is determined by the amount of defectives mixed in the pellet group k collected as normal.
Next, the operating time width T2 is changed. When the operating time width T2 is lengthened, the range of the supply speed at which the peak value is obtained is widened. Conversely, when the operating time width T2 is shortened, the range of the supply speed at which the peak value is obtained is narrowed. Then, as shown by the curve h2, the proper adjustment state is when the range of the supply speed at the peak value is a narrow range near the supply speed i1 at the center position. In other words, in the adjusted state of the operating time width T2, air is jetted and separated only for the defective object, and the separation function is not exerted as much as possible for the normal object existing near the defective object.
[0033]
[Another embodiment]
In the above embodiment, the flow path IK is configured to be formed by a drop path from the upper surface of the plate-like shooter 1 and the lower end portion of the shooter 1, but in addition to this, for example, a group of powder particles is arranged in a row. You may comprise so that it may be formed in the fall path | route from the eaves etc. which flow-down guide to the bottom, and the lower end part of the eaves.
[0034]
In the above embodiment, the supply means KK is configured by the vibration feeder 9, but in addition to this, a belt for placing and conveying the powder particles is provided, and the conveying speed of the belt is changed to change the powder to the supply location 1 a. You may comprise with the belt-type supply means which can change the supply speed of a granular material group.
[0035]
In the said embodiment, the detection means 100 is comprised so that the presence or absence of the defect in a granular material group may be detected based on the light reception information of the reflected light from each of the front side and rear surface side of the granular material to which it moves down. However, in addition to this, the presence or absence of a defect may be detected based on the reflected light from the granular material and the received light information of the transmitted light transmitted through the granular material. Moreover, the detection means 100 may detect the presence or absence of the normal thing in a granular material group instead of detecting the presence or absence of the defective in the granular material group moved down.
[0036]
In the above embodiment, the separation unit 102 is configured to blow air on the defective or normal product to separate the defective product and the normal product into different paths. It is also possible to use a means of applying a spring to play it off.
[0037]
In the said embodiment, although illustrated about the case where a granular material group is a resin pellet, a granular material group is not restricted to this, For example, it can apply also when test | inspecting rice grains, such as polished rice and brown rice.
[Brief description of the drawings]
FIG. 1 is an overall side view of a particle inspection apparatus.
Fig. 2 Side view of the main part
FIG. 3 is a perspective view of the main part.
FIG. 4 is a side view of the main part.
FIG. 5 is a front view of the main part.
FIG. 6 is a block diagram of a control configuration.
FIG. 7 is a diagram showing a light receiving state of the line sensor.
Fig. 8 Line sensor output waveform diagram
FIG. 9 is a graph showing the relationship between the supply speed of the granular material group and the initial speed.
FIG. 10 is a graph showing the relationship between the initial speed and the final speed of a flowing particle group.
FIG. 11 is a graph showing the relationship between the supply speed of the granular material group and the set time until the separation operation is performed.
FIG. 12 is a time chart showing detection timing and separation operation timing of a defective object.
FIG. 13 is a graph for explaining a method for adjusting the time width of separation operation;
[Explanation of symbols]
1a Supply point
9 Vibration feeder
9A Carrier
32 hour adjustment means
100 detection means
101 Control means
102 Separation means
IK flow path
J1 detection location
J2 separation point
KK supply means

Claims (2)

A supply means for supplying the powder group so as to move down along the flow path in a single state at the upper supply position in the flow path where the powder group moves down,
Detection means for detecting the presence or absence of a defective or normal substance in the granular material group moved down at the detection point in the middle of the flow down path,
Separation means that acts on the granular material group that is moved down at the separation point on the lower side of the detection point in the flow-down path, and separates the normal product and the defective product into different paths,
A particulate inspection apparatus provided with a control unit that determines the necessity of the separation operation of the separation unit based on detection information of the detection unit and controls the separation operation of the separation unit after a set time has elapsed. There,
The supply means is configured to be able to change the supply rate for the supply location of the granular material group in order to increase or decrease the supply amount of the granular material group,
After the control means determines the necessity of the separation operation of the separation means based on the detection information of the detection means, the set time until the separation means is activated is changed to increase / decrease in the supply speed of the supply means. Depending on the length ,
Manual time adjustment means for finely adjusting the set time set by the control means is provided,
The granular material inspection apparatus provided with the operation time width adjustment volume which changes the operation time width which operates the said isolation | separation means .   A vibration feeder in which the supply means includes a vibration-type conveyance body that places and conveys the granular material group, and the supply speed of the granular material group is increased or decreased by changing the vibration amplitude of the conveyance body. The granular material inspection apparatus according to claim 1, comprising:

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