Image acquisition device of color sorter

Abstract

The utility model provides an image acquisition device of a color sorter, which comprises a conveying unit for conveying materials and an image acquisition unit arranged above the conveying unit close to a blanking end and at the blanking end of the conveying unit. When materials pass through a first collection point on a material conveying path, the image collection unit collects optical information once, and when the same material continues to advance on the conveying path, is thrown from a blanking end and passes through a second collection point on a throwing path, the image collection unit collects the optical information of the materials again, so that the optical information of the materials is collected at different collection points. Optical information of the same material is collected twice, so that the material information is collected more comprehensively, and the sorting precision of the color sorter is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of color sorters, and in particular relates to an image acquisition device for a color sorter. Background Art

[0002] As an excellent material sorting equipment, the color sorter is widely used in grain processing, chemical material sorting and other industries. The color sorter as a whole includes key components such as the conveying mechanism, optical signal collection mechanism, and sorting actuator arranged in sequence along the material conveying path. The optical signal collection mechanism collects the optical information of the material at the beginning of the material falling path, and compares the collected optical information with the set optical information of the defective material. If they are the same, a signal is sent to the sorting actuator, which acts on its downstream to change the falling path of the sorted material and complete the sorting action of the set material.

[0003] Existing crawler color sorters collect material information by using multiple groups of cameras to collect optical information of materials at a single collection point. For example, a patent application entitled "Multi-angle material information collection device for crawler color sorter" (patent number: CN206911769 U) discloses an image collection system, which includes three camera groups, namely a first camera group, a second camera group and a third camera group. The first camera group and the second camera group are fixedly installed above the material information collection point, and the third camera group is fixedly installed below the material information collection point. The material information collection point is located on the parabolic trajectory of the material to be selected when it falls along the crawler.

[0004] The above solution uses multiple sets of cameras to collect material information more comprehensively. However, for garlic kernels, chestnut kernels and other products with multiple faces and large curved backs, even with multiple sets of cameras, the collection of material information is still not comprehensive enough and there are many blind spots. In conventional designs, due to space and structural limitations, even if one or more sets of cameras are added, the ideal effect cannot be achieved because of the small angle between the cameras and the original cameras. Utility Model Content

[0005] The utility model provides an image acquisition device for a color sorter, which aims to collect optical information of the same material at different acquisition points, so that the material information can be collected more comprehensively.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A color sorter image acquisition device comprises a conveying unit for conveying materials and an image acquisition unit, wherein the image acquisition unit is arranged above the conveying unit near the blanking end and at the blanking end of the conveying unit, and the image acquisition unit acquires optical information of the same material at a first acquisition point on the material transmission path and a second acquisition point on the material throwing path.

[0008] In the above scheme, the image acquisition unit is arranged above the blanking end of the conveying unit and at the blanking end of the conveying unit. When the material passes through the first acquisition point on the material transmission path, the image acquisition unit collects optical information once. When the same material continues to move forward on the transmission path and falls from the blanking end, when it passes through the second acquisition point on the falling path, the image acquisition unit collects the optical information of the material again. Thus, the optical information of the same material is collected twice at different acquisition points, so that the material information is collected more comprehensively, thereby improving the sorting accuracy of the color sorter. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of information of collecting materials at the first collection point of the utility model;

[0010] Figure 2 It is a schematic diagram of information of collecting materials at the second collection point according to the utility model. DETAILED DESCRIPTION

[0011] like Figures 1-2 The image acquisition device of a color sorter shown in the figure comprises a conveying unit A for conveying materials and an image acquisition unit 1. The image acquisition unit 1 is arranged above the conveying unit A near the blanking end and at the blanking end of the conveying unit A. The image acquisition unit 1 collects optical information of the same material at a first acquisition point on the material transmission path and a second acquisition point on the material throwing path.

[0012] The image acquisition unit 1 described in the above scheme is arranged above the blanking end of the conveying unit A and downstream of the blanking end of the conveying unit A. When the material arrives at the first acquisition point on the material transmission path after being transported by the conveying unit A, the image acquisition unit 1 acquires the optical information of the material for the first time. Under the action of the conveying unit A, the material is thrown down through the blanking end of the conveying unit A. The image acquisition unit 1 acquires the optical information of the material for the second time on the material throwing path, thereby acquiring the optical information of the same material twice at different acquisition points. Moreover, since there are more visual angle changes at the positions above the blanking end of the conveying unit A and at the blanking end of the conveying unit A, the image acquisition units 1 at the two positions can complement each other, thereby acquiring more comprehensive optical information of the material and improving the sorting accuracy of the color sorter.

[0013] Furthermore, the image acquisition unit 1 includes a first image acquisition unit 10, a second image acquisition unit 20, a third image acquisition unit 30, and a fourth image acquisition unit 40. The first image acquisition unit 10 and the third image acquisition unit 30 acquire optical information of the material at a first acquisition point at the downstream end of the material transmission path, and the second image acquisition unit 20 and the fourth image acquisition unit 40 acquire optical information of the material at a second acquisition point in the upstream section of the material dropping path. The second image acquisition unit 20 and the fourth image acquisition unit 40 are respectively disposed at the upper or lower part of the material dropping path.

[0014] In the above scheme, the first image acquisition unit 10 above the transmission path of the conveying unit A and the third image acquisition unit 30 on the material falling path collect optical information of the material with the belt surface of the conveying unit A as the background. There is no need to set up independent background components for the first image acquisition unit 10 and the third image acquisition unit 30. The second image acquisition unit 20 and the fourth image acquisition unit 40 at the material dropping end of the conveying unit A collect optical information of the material when it is dropped, thereby making the optical information of the material collected more comprehensive.

[0015] Specifically, the first image acquisition unit 10 includes a first light source 11 and a first camera 12, and the third image acquisition unit 30 includes a third light source 31 and a third camera 32. The light emission directions of the first light source 11 and the third light source 31 and the lens directions of the first camera 12 and the third camera 32 intersect at a first acquisition point on the belt surface of the conveying unit A, and the first acquisition point is selected at the downstream section of the conveying unit A near the downstream end. In the above scheme, the light emission directions of the first light source 11 and the third light source 31 and the lens directions of the first camera 12 and the third camera 32 intersect at the first acquisition point on the belt surface of the conveying unit A, ensuring the image acquisition accuracy of the first camera 12 and the third camera 32, and using the belt surface of the conveying unit A as a background plate for the first camera 12 and the third camera 32 to collect signals, not only eliminating the need to separately set a supporting component to support and install the background plate, but also greatly simplifying the structure of the color sorter, that is, it is conducive to integrating the first light source 11 and the first camera 12 of the first image acquisition unit 10 and the third light source 31 and the third camera 32 of the third image acquisition unit 30 in the optical machine box 50.

[0016] Furthermore, in order to better collect optical information of the second collection point on the material falling path, specifically, the second image acquisition unit 20 includes a second light source 21, a second background plate 22, and a second camera 23, and the fourth image acquisition unit 40 includes a fourth light source 41, a fourth background plate 42, and a fourth camera 43. The light reflected by the material from the second light source 21 is incident on the second camera 23, and the second background plate 22 is located on the reverse extension line of the light incident on the second camera 23. The light reflected by the material from the fourth light source 41 is incident on the fourth camera 43, and the fourth background plate 42 is located on the reverse extension line of the light incident on the fourth camera 43.

[0017] Preferably, the second camera 23 and the third camera 32 of the second image acquisition unit 20 and the third image acquisition unit 30 are located above the material dropping path, and the fourth camera 43 of the fourth image acquisition unit 40 is located below the material dropping path. The second camera 23, the third camera 32 and the fourth camera 43 in the above scheme are respectively located above and below the material dropping path, and the third camera 32 is located above the material dropping path and points to the first acquisition point on the belt surface of the conveying unit A. The third camera 32 can form a larger imaging angle with the first camera 12, and the second camera 23 and the fourth camera 43 are respectively located above and below the material dropping path, which is convenient for collecting optical information from different angles, thereby avoiding collection blind spots as much as possible and improving sorting accuracy.

[0018] In order to further improve the imaging effect, the present solution adopts dual light sources to provide illumination, and the second light source 21 and the fourth light source 41 are two groups of light sources arranged on the left and right sides of the second camera 23 and the fourth camera 43 respectively.

[0019] Furthermore, a supplementary light source 70 is arranged above the first collection point on the belt surface of the conveying unit A. The light emission directions of the supplementary light source 70, the first light source 11 and the third light source 31 intersect at the first collection point on the belt surface of the conveying unit A. The above scheme only adds one set of supplementary light sources 70, so that the first light source 11 and the third light source 31 both form a dual light source, thereby improving the imaging effect of the first camera 12 and the third camera 32.

[0020] Furthermore, in order to rationalize the distribution space of the entire image acquisition unit 1 and reduce the space occupied by the image acquisition unit 1 as much as possible, the first light source 11, the first camera 12, the second light source 21, the second camera 23 and the third light source 31, the third camera 32, the fourth background plate 42, and the supplementary light source 70 are located in the upper light chassis 50, and the fourth light source 41, the fourth camera 43, and the second background plate 22 are located in the lower light chassis 60, so as to ensure the cleanliness of the working environment of the image acquisition unit 1 while ensuring the imaging quality.

Claims

1. A color sorter image acquisition device, comprising a conveying unit (A) for conveying materials and an image acquisition unit (1), characterized in that: The image acquisition unit (1) is arranged above the conveying unit (A) near the material dropping end and at the material dropping end of the conveying unit (A), and the image acquisition unit (1) collects optical information of the same material at a first acquisition point on the material transmission path and a second acquisition point on the material dropping path.

2. The color sorter image acquisition device according to claim 1, characterized in that: The image acquisition unit (1) comprises a first image acquisition unit (10), a second image acquisition unit (20), a third image acquisition unit (30), and a fourth image acquisition unit (40); the first image acquisition unit (10) and the third image acquisition unit (30) acquire optical information of the material at a first acquisition point at the downstream end of the material transmission path; the second image acquisition unit (20) and the fourth image acquisition unit (40) acquire optical information of the material at a second acquisition point at the upstream end of the material throwing path; the second image acquisition unit (20) and the fourth image acquisition unit (40) are respectively disposed at the upper or lower part of the material throwing path.

3. The color sorter image acquisition device according to claim 2, characterized in that: The first image acquisition unit (10) comprises a first light source (11) and a first camera (12); the third image acquisition unit (30) comprises a third light source (31) and a third camera (32); the light emission directions of the first light source (11) and the third light source (31) and the lens directions of the first camera (12) and the third camera (32) intersect at a first acquisition point on the belt surface of the conveying unit (A).

4. The image acquisition device for a color sorter according to claim 2, characterized in that: The second image acquisition unit (20) comprises a second light source (21), a second background plate (22), and a second camera (23); the fourth image acquisition unit (40) comprises a fourth light source (41), a fourth background plate (42), and a fourth camera (43); the light reflected by the second light source (21) through a material is incident on the second camera (23); the second background plate (22) is located on a reverse extension line of the light incident on the second camera (23); the light reflected by the fourth light source (41) through a material is incident on the fourth camera (43); and the fourth background plate (42) is located on a reverse extension line of the light incident on the fourth camera (43).

5. The color sorter image acquisition device according to claim 4, characterized in that: The second camera (23) and the third camera (32) of the second image acquisition unit (20) and the third image acquisition unit (30) are located above the material dropping path, and the fourth camera (43) of the fourth image acquisition unit (40) is located below the material dropping path.

6. The image acquisition device for a color sorter according to claim 4, characterized in that: The second light source (21) and the fourth light source (41) are two groups of light sources arranged on the left and right sides of the second camera (23) and the fourth camera (43) respectively.

7. The color sorter image acquisition device according to claim 3, characterized in that: A supplementary light source (70) is arranged above the first collection point on the belt surface of the conveying unit (A), and the light emission directions of the supplementary light source (70), the first light source (11) and the third light source (31) intersect at the first collection point on the belt surface of the conveying unit (A).

8. The color sorter image acquisition device according to any one of claims 1 to 7, characterized in that: The first light source (11), the first camera (12), the second light source (21), the second camera (23), the third light source (31), the third camera (32), the fourth background plate (42), and the supplementary light source (70) are located in an upper light cabinet (50), and the fourth light source (41), the fourth camera (43), and the second background plate (22) are located in a lower light cabinet (60).

Images