Image acquisition device of color sorter

Abstract

The utility model aims to provide an image acquisition device of a color sorter, a camera and a background plate are respectively arranged above and below opposite sides of a throwing path of materials to be subjected to color sorting, a first light source and the camera are positioned on the same side of the throwing path of the materials to be subjected to color sorting, and the background plate and a second light source are positioned on the other side of the throwing path of the materials to be subjected to color sorting. The first light source and the second light source irradiate the front face or the back face of a to-be-color-sorted material. Compared with the prior art, only one camera is adopted, light supplementing irradiation is carried out from the two opposite sides of the material to be subjected to color sorting, in this way, the light reflection performance and the light transmission performance of the material can be collected, targeted image collection is carried out on the materials with different transmission performance, and efficient and accurate material color sorting is achieved.

Description

Technical Field

[0001] The present application relates to an image acquisition device for a color sorter. Technical Background

[0002] The color sorter uses a camera to collect images. Usually, when the camera collects images, it needs to use a light source to fill in the light of the material. Then the camera collects images of the material and uses image signals to identify materials of different properties so as to drive the blowing airflow to separate the materials to be removed into the corresponding storage bins. Among the materials to be sorted, there are opaque materials, transparent or translucent materials. The opaque materials can be distinguished from the good and bad materials according to the color characteristics of the surface after the fill-in light. Generally, the front fill-in light perpendicular to the material (actually at a certain angle) is used, and the camera is perpendicular to the front of the material to take pictures and identify; the color characteristics of transparent or translucent materials are generally not very obvious. In the prior art, there is no good color sorting solution for the color sorting of translucent or transparent materials. The commonly used solution is to process them through two or even three color sorting methods. In order to complete the purpose of two or even three color sortings, the same color sorter needs to perform two or three color sortings, or two or three color sorters are provided for color sorting. The most direct result of the above-mentioned prior art solutions is low color sorting efficiency and poor color sorting accuracy. Utility Model Content

[0003] The utility model aims to provide a color sorter image acquisition device which can realize transparency or not by using one camera, and has high color sorting accuracy and high efficiency.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an image acquisition device for a color sorter, a camera and a background plate are respectively placed at the upper and lower sides of the opposite sides of the falling path of the material to be color sorted, a first light source and a camera are located on the same side of the falling path of the material to be color sorted, the background plate and the second light source are located on the other side of the falling path of the material to be color sorted, and the first light source and the second light source are respectively irradiated on the front or back of the material to be color sorted.

[0005] In the above technical solution, since only one camera is used and supplementary light is irradiated from two opposite sides of the material to be color sorted, the reflective and light transmittance properties of the material can be collected, and targeted image collection can be implemented for materials with different transmittance properties. This can accurately identify the true properties of the material, so as to accurately control whether the blowing airflow is started or not, thereby achieving efficient and accurate color sorting of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of this application;

[0007] Figure 2 Control principle diagram of the utility model;

[0008] Figure 3 It is a circuit schematic diagram of the utility model;

[0009] Figure 4 It is a timing diagram of light sources providing illumination alternately. DETAILED DESCRIPTION

[0010] like Figure 1 As shown, the image acquisition device of the color sorter includes a camera 10 and a background plate 20, which are respectively placed at the upper and lower sides of the opposite sides of the falling path of the material to be color sorted, the first light source 30 and the camera 10 are located on the same side of the falling path of the material to be color sorted, the background plate 20 and the second light source 40 are located on the other side of the falling path of the material to be color sorted, and the first light source 30 and the second light source 40 are respectively irradiated on the front or back of the material to be color sorted.

[0011] It should be noted that the front side of the material to be color sorted refers to the material side facing the lens of the camera 10, and the material opposite to the front side is the back side. The first light source 30 and the second light source 40 in the present application illuminate the front side or the back side of the material to be color sorted, respectively, so as to ensure that the camera 10 can collect the surface characteristics of the material as comprehensively as possible.

[0012] In view of the differences in light transmittance of materials, if only the front image of the material is collected, it may not be possible to effectively distinguish between translucent, semi-translucent and opaque materials, and finally lead to color sorting failure. In this application, the first light source 30 and the second light source 40 are alternately irradiated on the front or back of the material to be color sorted, so that the images of materials with different light transmittance can be captured in a timely and accurate manner, so that the color sorting blowing airflow can work, thereby ensuring correct color sorting.

[0013] The camera 10 and the first light source 30 are located above the falling path of the materials to be color sorted, and the background plate 20 and the second light source 40 are located below the falling path of the materials to be color sorted. Since the falling of the materials to be color sorted is inevitably accompanied by dust and debris that contaminate and block the camera lens, the camera 10 is arranged above the falling path of the materials to be color sorted. It should be noted that the camera 10 is usually set in a camera case with light-transmitting glass, which ensures that the outer glass surface of the light-transmitting glass of the camera case faces downward, which can reduce the frequency of cleaning the light-transmitting glass of the camera case, and the camera 10 can still obtain a clear image of the material.

[0014] The angle β between the optical axis of the camera 10 and the plumb line is 3° to 15°, the angle between the optical axis of the camera 10 and the belt surface of the conveyor belt 50 is an obtuse angle, and the intersection of the optical axis of the camera 10 and the falling path of the material to be color-selected is close to the drop end of the conveyor belt 50.

[0015] The posture of the material when running on the conveyor belt 50 is a stable state with its mass center at a low position, that is, the state in which its projection area in the horizontal plane is the largest. The material that has just left the conveyor belt 50 basically maintains this state. As the dropping time increases, the posture of the material changes more freely and cannot be determined. Therefore, the intersection of the optical axis of the camera 10 of the utility model and the dropping path of the material to be color sorted is close to the dropping end of the conveyor belt 50, so that the most comprehensive and rich material front features can be obtained, which makes the judgment of the image information more accurate.

[0016] The first light source 30 is located in the area between the optical axis of the camera 10 and the conveyor belt 50 and is arranged close to the optical axis of the camera 10. The closer the light beam of the first light source 30 is to the optical axis of the camera 10, the less the image signal of the front side of the material facing the camera 10 is lost, that is, the image information of the material captured by the camera 10 is more comprehensive.

[0017] The second light source 40 is located in the area between the optical axis of the camera 10 and the conveyor belt 50 and is arranged close to the optical axis of the camera 10 . The second light source 40 is located within the range of the horizontal plane projection of the conveyor belt 50 and is adjacent to the blanking end of the conveyor belt 50 .

[0018] Just as the first light source 30 and the camera 10 need to be arranged in the camera case, the second light source 40 and the background board 20 are also arranged in the background case. There is light-transmitting glass on the background case. The closer the light-transmitting glass of the background case is to the blanking end of the conveyor belt 50, the lighter the dust accumulation on the light-transmitting glass of the background case will be, and the less frequent the cleaning will be. The second light source 40 is located within the range of the horizontal plane projection of the conveyor belt 50 and is close to the blanking end of the conveyor belt 50. This not only ensures that the transmitted light irradiated by the second light source 40 on the material can be collected by the camera, but also avoids the second light source 40 directly irradiating the camera 10 with strong light in the form of backlight, and avoids the backlight of the second light source 40 and the transmitted light of the transparent material forming a huge contrast image on the camera, resulting in the loss of material properties.

[0019] In order to realize the normal operation of the first light source 30 , the second light source 40 and the background plate 20 , the utility model provides the following specific control circuit.

[0020] See also Figure 2 , 3 The P5 terminal is connected to pins 15 and 16 of the controller module U1, and is connected to the controller through the P5 terminal. The P4 terminal connected to pins 17 and 18 of the controller module U1 is connected to the control end of the camera 10.

[0021] Pin 24 of the controller module U1 is connected to the base B of the transistor Q1, the collector C of the transistor is pulled up to 12V through the resistor R1, both ends of the resistor R1 are connected in parallel with the terminal P1, the terminal P1 is connected to the control end of the lower background plate 20, and the emitter E is connected to the ground signal;

[0022] Pin 23 of the controller module U1 is connected to the base E of the transistor Q2, the collector C of the transistor Q2 is pulled up to 12V through the resistor R2, both ends of the resistor R2 are connected in parallel with the terminal P2, and the terminal P2 is connected to the control end of the second light source 40;

[0023] Pin 22 of the controller module U1 is connected to the base E of the transistor Q3 , the collector C of the transistor Q3 is pulled up to 12V through the resistor R3 , both ends of the resistor R3 are connected in parallel with the terminal P3 , and the terminal P3 is connected to the control end of the first light source 30 .

[0024] Pin 1 of the controller module U1 is connected to a 12V power supply, pins 6 and 7 of the controller module U1 are connected to a crystal oscillator Y1 signal, and pin 8 is connected to a ground signal.

[0025] The controller module U1 receives the instructions from the computer through the terminal P5. After the internal program of the controller module U1 processes the instructions, Figure 4 To control the timing of positive light and light transmission, the corresponding high and low level signals are output from pin 22 of the controller module U1. The level signal output from pin 23 controls the first light source 30. When the level is high, the transistor Q2 is turned on, and the first light source 30 is lit. When the level is low, the transistor Q2 is turned off, and the first light source 30 is turned off. The level signal output from pin 22 controls the second light source 40. When the level is high, the transistor Q3 is turned on, and the second light source 40 is lit. When the level is low, the transistor Q3 is turned off, and the second light source is turned off. The controller module U1 simultaneously sends out the following signals through pins P18 and P17: Figure 3 Control the timing of camera 10. High level camera 10 takes pictures, low level camera 10 does not take pictures. The level signal output by pin 24 controls the background board 20. The signal is synchronized with the signal of the light source under control. When the level is high, Q1 is turned on and the background is lit. When the level is low, Q1 is turned off and the background is turned off.

[0026] The following combination Figure 2 Briefly describe the general process of color sorting of materials:

[0027] Step 1: The color sorter starts working, the control module sends a high level to control the first light source 30 and the background plate 20 to light up; the second light source 40 remains off, and the camera 10 is driven by a high level driving signal with the same frequency as the first light source 30 to take pictures and recognize, and pick up the analog signal of the image data of the front side of the material;

[0028] Step 2: The control module controls the output level to turn off the first light source 30, keep the second light source 40 off, keep the background plate 20 on, and the camera 10 does not take the image recognition. The camera module converts the first step image recognition signal into a digital signal and transmits it to the valve controller;

[0029] Step 3: The first light source 30 remains off, the control module sends a high level control to light up the second light source 40, the background plate 20 remains lit, and the camera 10 is driven by a high level driving signal with the same frequency as the second light source 40 to take pictures and recognize, and obtain an analog signal of the light-transmitting image data

[0030] Step 4: The first light source 30 remains off, the control module sends a low level to control the second light source 40 to turn off, the background plate 20 remains on, the camera does not take pictures, and the camera module converts the first step picture taking and recognition signal into a digital signal and transmits it to the valve controller;

[0031] By adopting the staggered stroboscopic working mode of the first light source 30 and the second light source 40, accurate identification of transparent or translucent materials is achieved, which greatly improves the sorting accuracy; the same row of cameras can realize both positive light imaging and transparent light imaging, which greatly saves material costs; the second light source 40 in the present application is directly always in the off state, and only the first light source 30 is responsible for the fill light operation. The color sorter involved in the present application can be used as a general color sorter for bulk materials that are not transparent.

Claims

1. A color sorter image acquisition device, characterized in that: The camera (10) and the background plate (20) are respectively arranged at the upper and lower sides of the opposite sides of the falling path of the material to be color sorted, the first light source (30) and the camera (10) are located on the same side of the falling path of the material to be color sorted, the background plate (20) and the second light source (40) are located on the other side of the falling path of the material to be color sorted, and the first light source (30) and the second light source (40) are respectively irradiated on the front side or the back side of the material to be color sorted.

2. The color sorter image acquisition device according to claim 1, characterized in that: The first light source (30) and the second light source (40) are alternately irradiated on the front side or the back side of the material to be color-selected.

3. The color sorter image acquisition device according to claim 1 or 2, characterized in that: The camera (10) and the first light source (30) are located above the falling path of the material to be color sorted, and the background plate (20) and the second light source (40) are located below the falling path of the material to be color sorted.

4. The image acquisition device for a color sorter according to claim 3, characterized in that: The angle β between the optical axis of the camera (10) and the plumb line is 3° to 15°, the angle between the optical axis of the camera (10) and the belt surface of the conveyor belt (50) is an obtuse angle, and the intersection of the optical axis of the camera (10) and the falling path of the material to be color-selected is close to the drop end of the conveyor belt (50).

5. The color sorter image acquisition device according to claim 4, characterized in that: The first light source (30) is located in a region between the optical axis of the camera (10) and the conveyor belt (50), and the first light source (30) is arranged close to the optical axis of the camera (10).

6. The color sorter image acquisition device according to claim 4, characterized in that: The second light source (40) is located in the area between the optical axis of the camera (10) and the conveyor belt (50) and the second light source (40) is arranged close to the optical axis of the camera (10). The second light source (40) is located within the range of the horizontal plane projection of the conveyor belt (50) and is adjacent to the blanking end of the conveyor belt (50).

7. The color sorter image acquisition device according to claim 1 or 2, characterized in that: The P5 terminal is connected to the pins 15 and 16 of the controller module U1, and is connected to the controller through the P5 terminal. The P4 terminal connected to the pins 17 and 18 of the controller module U1 is connected to the control end of the camera (10).

8. The image acquisition device for a color sorter according to claim 7, characterized in that: Pin 24 of the controller module U1 is connected to the base B of the transistor Q1, the collector C of the transistor is pulled up to 12V through the resistor R1, both ends of the resistor R1 are connected in parallel with the terminal P1, the terminal P1 is connected to the control end of the lower background plate (20), and the emitter E is connected to the ground signal; Pin 23 of the controller module U1 is connected to the base E of the transistor Q2, the collector C of the transistor Q2 is pulled up to 12V through the resistor R2, both ends of the resistor R2 are connected in parallel with the terminal P2, and the terminal P2 is connected to the control end of the second light source (40); Pin 22 of the controller module U1 is connected to the base E of the transistor Q3. The collector C of the transistor Q3 is pulled up to 12V through the resistor R3. Both ends of the resistor R3 are connected in parallel to the terminal P3. The terminal P3 is connected to the control end of the first light source (30).

9. The image acquisition device for a color sorter according to claim 7, characterized in that: Pin 1 of the controller module U1 is connected to a 12V power supply, pins 6 and 7 of the controller module U1 are connected to a crystal oscillator Y1 signal, and pin 8 is connected to a ground signal.

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