TWM623910U - Coffee bean detector with UV detection function - Google Patents

Abstract

A coffee bean testing machine includes a feeding, conveying and screening device, the conveying device has a plurality of accommodating holes arranged along a conveying path, each accommodating hole can only accommodate one coffee bean and moves along the conveying path according to the The sequence passes through the feeding, testing and screening areas, a visible light image capture unit and an ultraviolet image capture unit correspond to different detection positions in the inspection area respectively, and each image capture unit includes a accommodating hole located in the inspection area to take pictures The first image capture device and a second image capture device that shoots the accommodating holes in the detection area through a transparent baffle in reverse, the screening device is used to selectively make the accommodating holes in the screening area The coffee beans inside leave the conveying device; thereby, the coffee bean detection function can quickly and effectively screen the coffee beans and can detect the fluorescent defective beans.

Description

Coffee bean detector with UV detection function

This creation is related to the detection technology of coffee beans, especially a coffee bean detection machine that can quickly screen coffee beans and has the function of ultraviolet light detection.

Before the coffee beans are roasted, the steps of grading and screening are generally carried out. The step of grading is to divide the green coffee beans into different grades according to their appearance size, so that the coffee beans of the same grade are consistent in quality. It is to shave off foreign objects and defective beans. To be more specific, green coffee beans may have defective beans during the process of harvesting, drying, shelling, transportation and storage, such as broken, blackened, moth-eaten, etc. Green coffee beans with defects such as moldy, underripe, shrinking, etc., and defective beans with obvious color defects and foreign matter can be removed by a color sorter (such as the one provided by my country Patent No. 732015), but defective beans with other detailed defects are usually relied on. Manual selection.

Although there are existing automatic screening machines for screening defective beans, such as those provided by Chinese patent numbers M570428 and M583944, their practicability is still insufficient. In detail, the feeding mechanism of the bean selection device provided by M570428 cannot be avoided. The coffee beans are stacked on each other and it is easy to make the coffee beans too close to each other. This situation will not only hinder the image recognition operation, but also easily cause the normal beans and defective beans to be shaved together. The coffee bean screening system provided by M583944 In order to avoid the aforementioned problems, a feeding mechanism that allows the coffee beans to be sent in sequence is used, and the coffee beans are transferred from the feeding mechanism to the continuously rotating turntable for image recognition. However, this method not only feeds the coffee beans If it is too slow, the turntable cannot be rotated too fast to avoid the centrifugal force of the coffee beans making it impossible for the coffee beans to stay on the turntable stably, so it has the disadvantage of poor detection efficiency.

In addition, when green coffee beans are invaded by bacteria, the chemical substances contained in them will change, resulting in the deterioration of coffee beans, which will not only have a significant impact on coffee flavor, but also be harmful to human health. ; SCA for short) is listed as the defective coffee beans that need to be shaved, but such defective beans cannot be identified under daily visible light, so the conventional coffee bean screening machine can not detect such defective beans, and needs to be improved.

In view of the above deficiencies, the main purpose of this creation is to provide a coffee bean detection machine, which can quickly and effectively screen coffee beans, and has an ultraviolet light detection function to detect deteriorated coffee beans.

To achieve the above purpose, the coffee bean inspection machine provided by the present invention includes a feeding device, a conveying device, a plurality of image capturing units, and a screening device. The feeding device has a storage space for accommodating a plurality of coffee beans, and a discharge port communicating with the storage space for outputting the coffee beans therein. The conveying device includes a conveying belt with a plurality of accommodating holes arranged along a conveying path, each of the accommodating holes has an opening for a coffee bean to enter, and each of the accommodating holes can only The coffee bean is accommodated and moves along the conveying path to pass through a feeding area, a detection area and a screening area in sequence, and the discharge port of the feeding device is directed to the accommodating hole located in the feeding area, The detection zone has a plurality of detection positions. Each of the image capture units includes a first image capture device that shoots toward the opening of the receiving hole located in the detection area, and a first image capture device that faces the opposite direction to the first image capture device to capture images located in the detection area through a transparent baffle. a second image capture device in the accommodating hole of the area, and at least one light source for providing the light required by the first image capture device and the second image capture device for shooting, the image capture units include at least one A visible light image capturing unit and at least one ultraviolet image capturing unit, the light of the at least one light source of the visible light image capturing unit is visible light, the light of the at least one light source of the ultraviolet image capturing unit is ultraviolet light, the The equal image capturing units are respectively corresponding to the equal detection positions, and each of the accommodating holes moves along the conveying path and passes through the inspection positions, so that each of the detection positions is photographed by the corresponding image capturing unit. The screening device is arranged in the screening area of the conveying device, and is used for selectively making the coffee beans located in the accommodating holes of the screening area to leave the conveying device.

In this way, the coffee beans to be screened are output from the discharge port of the feeding device to the feeding area of the conveying device, and are accommodated in the accommodating holes in the feeding area one-to-one, and then the coffee beans follow the The accommodating hole where it is located moves through the detection area and the screening area in sequence, and the coffee beans in each accommodating hole are captured by the first and second image capturing devices in opposite directions in the detection area (for example, the first image The capture device shoots from top to bottom, and the second image capture device shoots from bottom to top), so that an image analysis software can identify whether the accommodating holes are normal beans or defective beans, and the screening device can then identify based on this. As a result, the coffee beans are screened, eg, normal beans leave the conveyor into a normal bean storage bin, or defective beans leave the conveyor into a defective bean storage bin. Since only one coffee bean can be accommodated in each accommodating hole, it can prevent the coffee beans from being stacked or too close to each other, which may hinder image recognition. Therefore, the coffee bean detector of the present invention can effectively screen the coffee beans. In addition, since the image capture and analysis speed is very fast, and the coffee beans are stably accommodated in the accommodating holes of the conveying device, the conveying speed of the conveying device can also be fast without causing the coffee beans to move or fall. The coffee bean testing machine of this creation can produce good testing efficiency. In addition, ultraviolet A (UVA) in ultraviolet light can activate cell function, and improper organic substances in deteriorated coffee beans will absorb energy and emit visible fluorescence under ultraviolet light irradiation, so the coffee bean detection machine of this creation can be used. Deteriorated coffee beans (also known as fluorescently defective beans) that cannot be identified under visible light (such as white light) are detected by its UV image capture unit.

The detailed structure, features, assembly or usage of the coffee bean detection machine with ultraviolet light detection function provided by the present creation will be described in the detailed description of the subsequent embodiments. However, those with ordinary knowledge in the field of creation should be able to understand that these detailed descriptions and the specific embodiments listed for implementing the creation are only used to illustrate the creation, not to limit the scope of the patent application of the creation.

The applicant first explains that in the embodiments and drawings to be introduced below, the same reference numerals denote the same or similar elements or structural features thereof. Secondly, when it is mentioned that an element is arranged on another element, it means that the aforementioned element is directly arranged on the other element, or the aforementioned element is indirectly arranged on the other element, that is, there is still a gap between the two elements. One or more other elements are provided. When it is mentioned that an element is "directly" disposed on another element, it means that no other element is disposed between the two elements.

Please refer to FIGS. 1 to 3 first. The coffee bean inspection machine 10 provided by a preferred embodiment of the present invention includes a conveying device 20 , a feeding device 30 , a scanning device 40 , two image capturing units 51 , 52 , A screening device 60 , and two collection barrels 71 , 72 . The aforementioned components of the coffee bean detector 10 are actually arranged in a casing. In order to simplify the drawing and facilitate the description, the drawings in this creation do not show the complete casing, but only show the inside of the casing. It is used to provide a base plate 15 and a vertical plate 16 for the aforementioned partial components.

The conveying device 20 is a circulatory conveying conveyor system, which includes a driving motor 21, two rollers 22A and 22B driven by the driving motor 21, and a shielding unit 25 fixed on the vertical plate 16 (see FIG. 3 ). and described in detail below), and a conveyor belt 23 (eg, a food-grade conveyor belt) wound around the two rollers 22A, 22B and the shielding unit 25 .

The conveyor belt 23 has a first surface 231 and a second surface 232 located on the outer side and inner side of the conveyor belt 23 respectively, and a plurality of accommodating holes 233 penetrating the first and second surfaces 231 and 232. The rollers 22A, 22B and the The shielding unit 25 abuts on the second surface 232 and sets the conveyor belt 23 into a trapezoid shape, so that the conveyor belt 23 includes a shorter upper horizontal section 234, a longer lower horizontal section 235, and a lower horizontal section 235. The right end of the horizontal section 235 extends obliquely upward to the first inclined section 236 of the right end of the upper horizontal section 234 , and a second inclined section extends obliquely downward from the left end of the upper horizontal section 234 to the left end of the lower horizontal section 235 237. Viewed from the direction of FIG. 3 , the rollers 22A, 22B drive the conveyor belt 23 to rotate in a counterclockwise direction, so that each of the accommodating holes 233 moves along a trapezoidal conveying path P and sequentially passes through a A feeding area 26 in the inclined section 236 , a detection area 27 in the upper horizontal section 234 , a screening area 28 in the second inclined section 237 , and a second inclined section 237 and the lower horizontal section 235 The aggregate area 29 at the junction.

It is worth mentioning that the drawing of this creation only draws the accommodating holes 233 located on the horizontal section 234 above the conveyor belt 23 . In fact, the conveyor belt 23 has the same distribution as the accommodating holes 233 of the horizontal section 234 above. There are accommodating holes 233 in each section of the whole. The accommodating holes 233 are arranged in three rows and multiple rows along the conveying path P, that is, each row includes three accommodating holes 233, and the accommodating holes 233 in the same row are simultaneously moved to the feeding area 26, the detection zone 27, the screening zone 28 or the same location of the aggregate zone 29.

As shown in FIG. 3 , the shielding unit 25 includes a plurality of fixing pieces 256 fixed to the vertical plate 16 , and an entry point close to the second surface 232 of the conveyor belt 23 by being fixed on the fixing pieces 256 . A material area cover 251, a detection area cover 252 and a screening area cover 253, the feed area cover 251 is arranged on the part of the second surface 232 of the conveyor belt 23 located in the material input area 26, the detection area The area shielding member 252 is installed on the portion of the second surface 232 of the conveyor belt 23 located in the detection area 27 , and the screening area shielding member 253 is installed on the portion of the second surface 232 of the conveyor belt 23 located in the screening area 28 . As shown in FIG. 4 , each of the accommodating holes 233 has two openings 233a and 233b respectively located on the first and second surfaces 231 and 232 of the conveyor belt 23 , and the openings 233a of each of the accommodating holes 233 are not closed at various positions. The openings 233b of the accommodating holes 233 are in the process of moving from the feeding area 26 to the detection area 27 and the screening area 28 are blocked by the feeding area shielding member 251, the detection area shielding member 252 and the screening area. The shielding member 253 shields.

As shown in FIG. 1 , the feeding device 30 includes a generally funnel-shaped feeder 31 , and a throttle valve 32 disposed in the feeder 31 . The feeder 31 has a A storage space 311 for the coffee beans to be screened (green coffee beans), and a discharge port 312 that communicates with the storage space 311 and is located below the storage space 311 , and the discharge port 312 faces the conveyor belt 23 The opening 233a of the accommodating hole 233 is located in the feeding area 26, whereby the coffee beans in the storage space 311 can be dropped and output from the discharging port 312 to the feeding area 26 of the conveying device 20. The accommodating hole 233 is in a state of being open at the top and closed at the bottom during the process of moving from the feeding area 26 to the detection area 27 and the screening area 28, so the coffee beans are continuously located in the accommodating hole 233 during the aforesaid process without will fall. The throttle valve 32 is disposed between the storage space 311 and the discharge port 312 to control the amount of coffee beans falling in the storage space 311 , so as to limit the amount of coffee beans output from the discharge port 312 . rate. In addition, a side blocking unit 24 composed of a plurality of plates is further fixed on the feeding area shielding member 251, so as to enclose the opening 233a of the accommodating hole 233 of the feeding area 26 inside the side blocking frame 29, Thereby, the coffee beans output from the feeding device 30 are restricted to the feeding area 26 .

As shown in FIG. 4 , the opening 233a of each accommodating hole 233 can only accommodate one coffee bean 17 , and the inner space of each accommodating hole 233 can only accommodate one coffee bean 17 . The depth d1 of the accommodating hole 233 is preferably greater than or equal to 1 times the height h of the coffee beans 17 and less than 2 times the height h of the coffee beans 17 (ie, 2h>d1>1h). , so that the coffee beans 17 can be stably pushed by the inner wall of the accommodating hole 233 and smoothly transported by the conveying device 20 , but not enough for two stacked coffee beans to be completely accommodated in the same accommodating hole 233 .

In order to further avoid the situation of stacking coffee beans, the feeding area 26 is further provided with the sweeping device 40 , as shown in FIG. 1 , the sweeping device 40 is located between the discharge port 312 of the feeding device 30 and the A brush 41 and two sweeping rollers 42 and 43 are included between the detection areas 27. The brush 41 is only separated from the first surface 231 of the conveyor belt 23 by a small predetermined distance d2 (as shown in FIG. 4 ). Therefore, the coffee beans 17 protruding from the opening 233a of the accommodating hole 233 beyond the predetermined distance d2 can be swept off to ensure that there is only one coffee bean 17 in each accommodating hole 233 of the conveyor belt 23 . The feed rollers 42 and 43 just abut against the first surface 231 of the conveyor belt 23 and rotate in opposite directions to push the coffee beans 17 upward and downward respectively into the accommodating holes 233 . The coffee beans accommodated in the accommodating hole 233 of the feeding area 26 leave the feeding area 26 along with the movement of the accommodating hole 233 , and then move toward the detection area 27 .

Please refer to FIG. 3 and FIG. 5 , the detection area 27 of this embodiment has two detection positions 271 and 272 , so two image capture units 51 and 52 are correspondingly arranged. Each of the accommodating holes 233 together with the coffee beans accommodated therein It moves along the conveying path P and passes through the two detection positions 271 and 272 successively, to be captured by the corresponding image capture unit 51 at the detection position 271 , and then to be captured by the corresponding image capture unit 52 at the detection position 272 shoot. As shown in FIG. 1 to FIG. 3 , each of the image capturing units 51 and 52 includes a first image capturing device 511 for capturing (shooting from top to bottom) toward the opening 233 a of the accommodating hole 233 in the detection area 27 , 521 , a second image capture device 512 , 522 photographed toward the opening 233b of the accommodating hole 233 located in the detection area 27 (photographed from bottom to top), and respectively fixed and adjacent to the first image capture device Two light sources 513 and 523 below the capture device and above the second image capture device. In fact, a single light source can also be used to provide the light required by the first image capturing devices 511 and 521 and the second image capturing devices 512 and 522 for shooting.

As shown in FIG. 6 , the detection area shielding member 252 includes a frame body 254 (made of metal, for example) and two transparent baffles 255 (material of glass, for example). The two through holes 254b in the embedding groove 254a, the two transparent baffles 255 are respectively embedded in the two embedding grooves 254a and cover the two through holes 254b respectively. The openings 233b of the accommodating holes 233 at the two detection positions 271 and 272 are used to support the coffee beans therein. The two second image capturing devices 512 and 522 can still take pictures at the two detection positions 271 and 522 through the two transparent baffles 255 respectively. 272 coffee beans.

The two light sources 513, 523 of each of the image capturing units 51, 52 respectively provide the light required for shooting by the corresponding first image capturing device 511, 521 and the second image capturing device 512, 522. In this embodiment In the above, the image capture unit 51 is a visible light image capture unit exemplified by white light, that is, the light of the two light sources 513 is white light (but the invention is not limited to white light), so that the first and second images are captured The images of the coffee beans captured by the devices 511 and 512 can be analyzed by a computer software to identify that the coffee beans in each of the accommodating holes 233 are normal beans or defective beans in appearance, and the image capturing unit 52 is a In the ultraviolet image capture unit, the light of the two light sources 523 is ultraviolet light. The irradiation of ultraviolet light can make the chemical components in the defective green beans absorb the light of a specific wavelength band and reflect the visible fluorescence to release energy, so that the first, The images of the coffee beans captured by the two image capturing devices 521 and 522 can be analyzed by computer software to determine the coffee flaws that cannot be found under visible light (eg, white light), that is, the deteriorated fluorescently flawed beans can be detected.

More specifically, each of the light sources 513 and 523 in this embodiment is a circular chip on board (COB) light source, and COB is a kind of light source formed by directly adhering a plurality of LED chips to a substrate to form a single The module's chip direct packaging technology, COB LED looks like a light-emitting board instead of multiple independent light-emitting bodies when powered on. This light source has the advantages of low cost, suitable brightness, and the shape and size can be freely designed. In addition, the first and second image capturing devices 521 and 522 of the ultraviolet image capturing unit 52 in the present invention can respectively be provided with a filter for reducing blue light (located inside the image capturing device and not shown in the figure) , Since the ultraviolet LED is designed to add blue light to remind it to be unsafe light, the lenses of the first and second image capture devices 521 and 522 are equipped with anti-UV filters and reduce blue light by 20%, which can filter out excess blue light. Violet light to obtain a better coffee bean image. Furthermore, in this embodiment, only one visible light image capturing unit and one ultraviolet light image capturing unit are used to capture coffee beans at a single detection position respectively. However, in this invention, more visible light and ultraviolet light image capturing units can be set for multiple times. Shooting can further ensure the correctness of the test results.

As shown in FIG. 3 , the screening device 60 is disposed in the screening area 28 of the conveying device 20 for placing normal beans and defective beans respectively according to the results of the aforementioned image analysis and identification. Since each of the image capturing units 51 and 52 in this embodiment simultaneously captures three rows (ie, nine) of accommodating holes 233 , the screening device 60 simultaneously captures three rows (ie, nine) of storage holes in the screening area 28 . The coffee beans in the accommodating holes 233 are sorted, and the screening area shield 253 is also correspondingly provided with three rows (that is, nine) perforations 253a (as shown in FIG. 7 ) communicating with the accommodating holes 233 of the screening area 28 , The screening device 60 includes nine air supply pipes 61 (only three of which are shown in FIG. 3 ) communicated with the through holes 253 a respectively, and a high-pressure air source 62 communicated with the air supply pipes 61 , and the high-pressure air source 62 receives A controller (not shown in the figure) controls according to the results of the aforementioned image analysis and identification, and then selectively provides high-pressure air to each of the air supply pipes 61 . For example, the screening device 60 can be used to shave the defective beans identified by the above-mentioned images, and the controller controls the high-pressure air source 62 to supply high-pressure air to the air supply pipe 61 corresponding to the position of the defective beans, so as to keep the defective beans calmly The opening 233a of the placement hole 233 is ejected. This embodiment is further provided with a collecting bucket 71 fixed on the screening area 28 of the conveying device 20 . As shown in FIG. 7 , the collecting bucket 71 has a bottom plate 712 facing the first surface 231 of the conveyor belt 23 , and a through The partial opening 714 of the bottom plate 712 faces the nine accommodating holes 233 that communicate with the air supply pipe 61 of the screening device 60 for collecting the coffee beans that are left from the conveying device 20 by the aforementioned high-pressure air .

Since the portion of the conveyor belt 23 located in the screening area 28 is inclined from top to bottom along the conveying path P, the coffee beans that remain in the accommodating hole 233 after passing through the screening area 28 (in the above example, remain in the accommodating hole 233 ) The normal beans in the hole 233 will naturally fall from the collecting area 29 at the junction of the second inclined section 237 and the lower horizontal section 235, leave the conveyor belt 23, and fall into the collecting area 29 below the collecting area 29. Collection bucket 72. In this embodiment, the aforementioned roller 22A is disposed in the aggregate area 29 and abuts against the second surface 232 of the conveyor belt 23. As shown in FIG. 8 , the roller 22A is provided with a plurality of rollers capable of extending into the aggregate. The bump 222 of the accommodating hole 233 in the area 29, so that the roller 22A is used as an ejector, which is used to protrude into the accommodating hole 233 to eject the coffee beans, so as to prevent the coffee beans from falling out naturally. All the coffee beans located in the collecting area 29 leave the conveying device 20 and fall into the collecting bucket 72 .

It is worth mentioning that the accommodating holes 233 of the conveying device 20 of the present invention are not limited to be arranged in multiple rows, and the conveyor belt 23 is not limited to be arranged in a trapezoid shape, as long as the accommodating holes 233 are provided to stably convey the coffee. The coffee beans can be detected by the image capturing unit and selected by the screening device. In addition, the structures of the feeding device 30 , the sweeping device 40 and the screening device 60 are not limited to those provided in this embodiment, for example, those provided in the Chinese Patent No. M597400.

As can be seen from the foregoing, the coffee beans on the conveying device 20 of the present invention are accommodated in the accommodating holes 233 one-to-one, so whether the detection is performed in the detection area 27 or the selection is performed in the screening area 28 When the coffee beans are not stacked or too close to each other, the coffee bean inspection machine 10 of the present invention can effectively screen the coffee beans. In addition, due to the high speed of image capturing and analysis, and the coffee beans in the same row of the accommodating holes 233 are simultaneously captured by the same image capture unit, even the same image capture unit can capture multiple rows of the accommodating holes 233 at the same time For example, in this embodiment, the same image capture unit can capture three rows of accommodating holes 233 at the same time, that is, nine coffee beans are captured by the same image capture unit at the same detection position at the same time. The beans are stably accommodated in the accommodating hole 233 of the conveying device 20, so that the conveying speed of the conveying device 20 can be set very fast without moving or dropping the coffee beans. Therefore, the coffee bean testing machine 10 of the present invention Can produce good detection efficiency. More importantly, this creation has constructed an automatic sorting system that captures images under visible light and ultraviolet light respectively and uses image processing to automatically identify coffee beans. In addition to consistency, it is important to be able to screen the defective coffee beans that affect the coffee flavor and contain harmful substances, so as to provide consumers with clean and defect-free coffee beans.

Finally, it must be reiterated that the constituent elements disclosed in the foregoing embodiments of the present creation are only for illustration and are not intended to limit the scope of the present application. The substitution or variation of other equivalent elements should also be within the scope of the patent application of this application. covered.

10: Coffee bean detector 15: Substrate 16: Vertical plate 17: Coffee Beans 20: Conveyor device 21: drive motor 22A: Roller (ejector) 22B: Roller 222: bump 23: Conveyor belt 231: First Surface 232: Second Surface 233: accommodating hole 233a, 233b: Opening 234: Upper horizontal segment 235: Lower horizontal segment 236: First inclined segment 237: Second inclined segment 24: Side stop unit 25: Blocking unit 251: Blocker for feeding area 252: Detection area shield 253: Screening area cover 253a: Perforation 254: Frame 254a: Groove 254b: Through hole 255: Transparent bezel 256: Fixtures 26: Feeding area 27: Detection area 271, 272: Detection position 28: Screening area 29: Aggregate area 30: Feeding device 31: Feeder 311: Storage space 312: discharge port 32: Throttle valve 40: Sweeping device 41: Brush 42,43: Sweeping roller 51: (visible light) image capture unit 52: (UV light) image capture unit 511,521: The first image capture unit 512,522: Second image capture unit 513,523: Light source 60: Screening device 61: Air supply pipe 62: High pressure air source 71: Collection Bucket 712: Bottom plate 714: Opening 72: Collection Bucket P: conveying path h: height d1: depth d2: predetermined distance

FIG. 1 and FIG. 2 are schematic perspective views of a coffee bean detection machine with ultraviolet light detection function provided by a preferred embodiment of the present invention, but a screening device is not shown. Figure 3 is a front view of Figure 1 and shows the screening device. FIG. 4 is a schematic partial cross-sectional view of the coffee bean testing machine, and shows a coffee bean. FIG. 5 is a schematic top view of FIG. 1, but the two image capturing units are not shown. FIG. 6 is a schematic top view of a detection area shielding member of the coffee bean detection machine. FIG. 7 is a partial perspective exploded view of the coffee bean inspection machine, mainly showing a collecting bucket and a perforation of a screening area shielding member. FIG. 8 is a partial enlarged view of FIG. 1 , mainly showing an ejector.

10: Coffee bean detector

15: Substrate

16: Vertical plate

20: Conveyor device

22A: Roller (ejector)

22B: Roller

23: Conveyor belt

233: accommodating hole

234: Upper horizontal segment

235: Lower horizontal segment

236: First inclined segment

237: Second inclined segment

24: Side stop unit

30: Feeding device

31: Feeder

311: Storage space

312: discharge port

32: Throttle valve

40: Sweeping device

41: Brush

42,43: Sweeping roller

51: (visible light) image capture unit

52: (UV light) image capture unit

511,521: The first image capture unit

513,523: Light source

71: Collection Bucket

72: Collection Bucket

Claims (23)

A coffee bean detection machine with ultraviolet light detection function includes: a feeding device, which has a storage space for accommodating a plurality of coffee beans, and a storage space communicated with the storage space for outputting the coffee beans. A discharge port; a conveying device, including a conveying belt, the conveying belt has a plurality of accommodating holes arranged along a conveying path, each of the accommodating holes has an opening for a coffee bean to enter, and each of the accommodating holes has an opening for entering the coffee beans. The hole can only accommodate one coffee bean, and it moves along the conveying path and passes through a feeding area, a detection area and a screening area in sequence, and the discharge port of the feeding device is located in the feeding area. the accommodating hole, the detection area has a plurality of detection positions; a plurality of image capture units, each of the image capture units includes a first image capture device that shoots toward the opening of the accommodating hole located in the detection area, a The first image capturing device faces the opposite direction to photograph the second image capturing device located in the receiving hole of the detection area through a transparent baffle, and the first image capturing device and the second image capturing device are provided for capturing images at least one light source for required light, the image capturing units include at least one visible light image capturing unit and at least one ultraviolet image capturing unit, the light of the at least one light source of the visible light image capturing unit is visible light, The light of the at least one light source of the ultraviolet image capturing unit is ultraviolet light, the image capturing units are respectively corresponding to the detection positions, and the accommodating holes move along the conveying path to pass the detection positions. Each of the detection positions is photographed by its corresponding image capture unit; and a screening device is arranged in the screening area of the conveying device to selectively make the coffee beans located in the accommodating holes of the screening area leave the conveyor. The coffee bean detection machine with ultraviolet light detection function according to claim 1, wherein each of the light sources is a wafer board light source. The coffee bean detector with ultraviolet light detection function as claimed in claim 1 or 2, wherein the first image capture device and the second image capture device of the ultraviolet image capture unit are respectively provided with a filter capable of reducing blue light mirror. The coffee bean detector with ultraviolet light detection function as claimed in claim 3, wherein the conveying device includes a shielding unit, the shielding unit includes the transparent baffle, and the conveying belt has a discharge toward the feeding device The openings and the first surfaces of the first image capturing devices and a second surface facing the second image capturing devices, the accommodating holes pass through the first surface and the second surface of the conveyor belt, the The shielding unit is arranged at least on the part of the second surface of the conveyor belt located in the feeding area, the detection area and the screening area. The coffee bean detector with ultraviolet light detection function according to claim 4, wherein the shielding unit includes a screening area shielding member disposed on a portion of the second surface of the conveyor belt located in the screening area, and the screening area shielding member At least one perforation communicated with the accommodating hole of the screening area is provided, and the screening device includes at least one air supply pipe in communication with the perforation, and one in communication with the air supply pipe for selectively supplying high-pressure air to the air supply. High pressure air source for trachea. The coffee bean detection machine with ultraviolet light detection function as described in claim 5, further comprising a collection bucket disposed in the screening area of the conveying device, the collection bucket having a bottom plate facing the first surface of the conveying belt, and An opening through a part of the bottom plate, the opening is directed to the accommodating hole communicated with the air supply pipe of the screening device, and is used for collecting the coffee beans which are acted by the high pressure air and leave the conveying device. The coffee bean detector with ultraviolet light detection function according to claim 6, wherein the accommodating holes of the conveying device are arranged in multiple rows, each row includes a plurality of the accommodating holes, and each of the image capturing units is simultaneously Photograph at least one row of accommodating holes, the perforations of the shielding element in the screening area The number of air supply pipes of the screening device and the number of accommodating holes simultaneously captured by the image capturing unit are the same. The coffee bean detection machine with ultraviolet light detection function according to claim 7, wherein the conveying device further comprises a collecting area located behind the screening area along the conveying path, and the collecting area is provided with a collecting area that can extend into the conveying area The ejector with the accommodating hole is used to make all the coffee beans in the collecting area leave the conveying device. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 8, wherein the conveyor belt comprises an upper horizontal section, a lower horizontal section, and a conveyor belt extending obliquely downward from the upper horizontal section to the The inclined section of the lower horizontal section, the detection area and the screening area are respectively located in the upper horizontal section and the inclined section, the aggregate area is located at the junction of the inclined section and the lower horizontal section, and the ejector is a A roller abutting on the second surface of the conveyor belt, the roller is provided with a plurality of protrusions that can extend into the accommodating holes of the collecting area. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 9, wherein the shielding unit includes a detection area shielding member disposed on a portion of the second surface of the conveyor belt located in the detection area, and the detection area shielding member It includes a frame body and the transparent baffle. The frame body has an insertion groove and a through hole located in the insertion groove. The transparent baffle is embedded in the insertion groove and shields the through hole. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 10, further comprising a material-sweeping device disposed between the outlet of the supplying device and the detection area, for cleaning out protrusions from the container Set the coffee beans in the opening of the hole. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 11, wherein the depth of each of the accommodating holes of the conveying device is greater than or equal to 1 times the height of a coffee bean and less than a height of the coffee bean 2 times the height. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 12, wherein the feeding device further has a throttle valve disposed between the material storage space and the material outlet to restrict the coffee beans from being released from the coffee beans. The output rate of this outlet. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 1 or 2, wherein the conveying device includes a shielding unit, the shielding unit includes the transparent baffle, and the conveying belt has a surface facing the feeding device. The discharge port and the first surfaces of the first image capturing devices and a second surface facing the second image capturing devices, the accommodating holes pass through the first surface and the second surface of the conveyor belt , the shielding unit is arranged at least on the second surface of the conveyor belt at the part of the feeding area, the detection area and the screening area. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 14, wherein the shielding unit includes a screening area shielding member disposed on a portion of the second surface of the conveyor belt located in the screening area, and the screening area shielding member At least one perforation communicated with the accommodating hole of the screening area is provided, and the screening device includes at least one air supply pipe in communication with the perforation, and one in communication with the air supply pipe for selectively supplying high-pressure air to the air supply. High pressure air source for trachea. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 15, further comprising a collecting bucket disposed in the screening area of the conveying device, the collecting bucket having a bottom plate facing the first surface of the conveying belt, and a partial opening through the bottom plate, the opening The mouth is facing the accommodating hole which is communicated with the air supply pipe of the screening device, and is used for collecting the coffee beans which are left from the conveying device by the action of the high pressure air. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 15, wherein the accommodating holes of the conveying device are arranged in a plurality of rows, each row includes a plurality of the accommodating holes, and each of the image capturing units is simultaneously Photographing at least one row of accommodating holes, the number of perforations of the screening area shielding element, the number of air supply pipes of the screening device, and the number of accommodating holes simultaneously photographed by the image capturing unit are the same. The coffee bean detection machine with ultraviolet light detection function according to claim 14, wherein the shielding unit includes a detection area shielding member disposed on a portion of the second surface of the conveyor belt located in the detection area, and the detection area shielding member It includes a frame body and the transparent baffle. The frame body has an insertion groove and a through hole located in the insertion groove. The transparent baffle is embedded in the insertion groove and shields the through hole. The coffee bean detection machine with ultraviolet light detection function according to claim 1 or 2, wherein the conveying device further comprises a collecting area located behind the screening area along the conveying path, and the collecting area is provided with a The ejector of the accommodating hole of the conveying belt is used to make all the coffee beans in the collecting area leave the conveying device. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 19, wherein the conveyor belt comprises an upper horizontal section, a lower horizontal section, and a conveyor belt extending obliquely downward from the upper horizontal section to the the inclined section of the lower horizontal section, the conveyor belt has a discharge opening facing the feeding device and a first surface of the first image capturing devices and a second surface facing the second image capturing devices; The detection area and the screening area are located in the upper horizontal section and the inclined section respectively, and the aggregate area is located in the inclined section and the lower horizontal section At the junction, the ejector is a roller abutting against the second surface of the conveyor belt, and the roller is provided with a plurality of protrusions that can extend into the accommodating holes of the collecting area. The coffee bean detection machine with ultraviolet light detection function as described in claim 1 or 2, further comprising a material-sweeping device disposed between the outlet of the supplying device and the detection area, for cleaning the protruding parts of the coffee bean The opening of the accommodating hole contains coffee beans. The coffee bean detection machine with ultraviolet light detection function according to claim 1 or 2, wherein the depth of each of the accommodating holes of the conveying device is greater than or equal to 1 times the height of the coffee beans and less than the height of the coffee beans 2 times the height of the bean. The coffee bean detection machine with ultraviolet light detection function as claimed in claim 1 or 2, wherein the feeding device further has a throttle valve disposed between the storage space and the outlet for restricting coffee The rate at which beans are output from this outlet.

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