Background light source system for low-contrast defect detection of glass container

Abstract

The utility model discloses a background light source system for low-contrast defect detection of a glass container, and belongs to the technical field of defect detection of glass containers. Which comprises a background light source and a control circuit used for controlling the background light source to be turned on or turned off, and is characterized in that a light source array is arranged on the end face, facing a glass container, of the background light source, a plurality of LED light source sets are symmetrically arranged in the light source array, and the control circuit is connected with all the LED light source sets and controls the LED light source sets to be turned on or turned off. And a plurality of bright areas or / and dark areas are formed in the light source array. In the technical scheme of the invention, through the control of the control circuit, a plurality of bright areas or / and dark areas are formed in the light source array, so that the light source array which has different patterns and can be automatically set is formed, and the accuracy of low-contrast defect detection of the glass container is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass container defect detection, and particularly relates to a background light source system for detecting low-contrast defects of glass containers. Background Art

[0002] Defect detection of glass containers after being manufactured is an essential link in the entire production system. During the defect detection process of glass containers, taking pictures of glass containers and judging the defects of glass containers by image processing are currently relatively common means. When taking pictures of glass containers, background light sources are generally arranged on both sides of the glass container conveyor belt, and industrial cameras are arranged at the background light sources. During the process that the glass containers pass through along with the conveyor belt, the industrial cameras complete taking pictures under the action of the background light sources.

[0003] As the market's requirements for the quality of glass containers are getting higher and higher, the requirements for detecting low-contrast defects of glass containers are also getting higher and higher. In the prior art, the detection of low-contrast defects of glass containers is generally realized through software algorithms, such as the technical solutions described in the Chinese invention patent with the application number 201910081135.8, the application date of January 28, 2019, and the patent name of "A Method and Device for Detecting Low-Contrast Defects"; the Chinese invention patent with the application number 201911186047.0, the application date of November 28, 2019, and the patent name of "A Method for Detecting Defects of Camera Glass"; and the Chinese invention patent with the application number 202110846802.4, the application date of July 26, 2021, and the patent name of "A Method for Detecting Low-Contrast Foreign Objects and Different-Color Defects of Glass". The defect of realizing the detection of low-contrast defects of glass containers through software algorithms is that it will greatly increase the complexity of the program.

[0004] The patent application with the application number 201180029178.3, the application date of April 12, 2011, and the patent name of "A Method for Detecting Defects of Glassware Articles and a Device for Implementing the Method" also records a technical solution for detecting low-contrast defects. In this technical solution, a strip-shaped light source is provided. After image acquisition is realized under the irradiation of the strip-shaped light source for glassware, the detection of low-contrast defects is further realized through image analysis. However, it is found during the specific implementation of this technical solution that when only irradiating the glassware to be detected with a strip-shaped light source, since the state of the light source is still relatively fixed, there are still problems that some defects cannot be detected. Therefore, designing a technical solution that can improve the detection of low-contrast defects of glassware has become an urgent problem to be solved in this field. Summary of the Utility Model

[0005] The technical problem to be solved by the present utility model is: to overcome the deficiencies of the prior art and provide a background light source system for detecting low-contrast defects of glass containers, which can form several bright areas or / and dark areas in the light source array through the control of the control circuit, thereby forming different patterns and a light source array that can be set by itself, improving the detection accuracy of low-contrast defects of glass containers.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: the background light source system for detecting low-contrast defects of glass containers includes a background light source and a control circuit for controlling the lighting or extinguishing of the background light source. It is characterized in that: a light source array is arranged on the end face of the background light source facing the glass container, and several LED light source groups arranged symmetrically are arranged in the light source array. The control circuit is connected to all the LED light source groups and controls each LED light source group to light or extinguish, forming several bright areas or / and dark areas in the light source array.

[0007] Preferably, the light source array is composed of several horizontally arranged light source modules in sequence. Each horizontal light source module includes a plurality of backlight units, and all the backlight units are arranged symmetrically with respect to the midline of the horizontal light source module.

[0008] Preferably, each backlight unit is composed of two backlight sub-units, and two backlight sub-units arranged symmetrically with respect to the midline form a group of LED light source groups.

[0009] Preferably, the background light sources are symmetrically arranged on both sides of the traveling route of the glass container.

[0010] Preferably, a conveyor belt for conveying the glass container is arranged on the traveling route of the glass container.

[0011] Preferably, the control circuit includes a single-chip microcomputer and a first programmable logic unit and a second programmable logic unit connected to the single-chip microcomputer. The output end of the first programmable logic unit is connected with several driving units, and a group of symmetrically arranged LED light source groups is connected to the output end of any one driving unit.

[0012] Preferably, the control circuit further includes a host computer, and the host computer is connected to the single-chip microcomputer through a communication module.

[0013] Compared with the prior art, the beneficial effects of the present utility model are:

[0014] In the technical solution of the present application, through the control of the control circuit, several bright areas or / and dark areas are formed in the light source array, thereby forming a light source array with different patterns and can be set by itself, improving the detection accuracy of low-contrast defects of glass containers.

[0015] In the technical solution of this application, several groups of backlight photon units are symmetrically arranged with respect to the center line mirror surface. Theoretically, backlight light sources of any shape with a symmetric structure can be formed, thus improving the flexibility of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of a background light source system for detecting low-contrast defects of glass containers.

[0017] Figure 2 It is a schematic diagram of a light source array of a background light source for detecting low-contrast defects of glass containers.

[0018] Figure 3 It is a schematic diagram of the structure of any horizontal light source module of the light source array.

[0019] Figure 4 It is a schematic block diagram of the driving circuit principle of a background light source system for detecting low-contrast defects of glass containers.

[0020] Figure 5 It is a schematic diagram of the effect of a strip-shaped light source formed by a background light source system for detecting low-contrast defects of glass containers.

[0021] Figure 6 It is a schematic diagram of the effect of a grid-shaped light source formed by a background light source system for detecting low-contrast defects of glass containers.

[0022] Wherein: 1. Background light source; 2. Conveyor belt; 3. Glass container; 4. Backlight unit; 5. Horizontal light source module; 6. Center line; 7. Backlight photon unit; 8. Bright area; 9. Dark area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Figures 1 to 6 This is the best embodiment of the present invention. The following further describes the present invention in conjunction with the attached Figures 1 to 6 drawings.

[0024] As Figure 1 shown, a background light source system for detecting low-contrast defects of glass containers (hereinafter referred to as the background light source system) includes a plurality of background light sources 1 arranged on both sides of the conveying path of the glass container 3, and an industrial camera (not shown in the figure) is provided at each background light source 1. The conveying path of the glass container 3 is realized by the conveyor belt 2, and several glass containers 3 spaced from each other travel under the drive of the conveyor belt 2. When the glass container 3 passes through the background light sources 1 on both sides, the industrial camera takes pictures of the glass container 3 and sends the captured image information to the server for analysis to realize the detection of low-contrast defects.

[0025] In this backlight source system, three groups of backlight sources 1 are arranged on each side of the conveyor belt 2 as an example for illustration: Among the three groups of backlight sources 1 on each side, the backlight source 1 in the middle is directly opposite to the conveyor belt 2, and the side backlight sources 1 on both sides of the middle backlight source 1 are symmetrically arranged with respect to the middle backlight source 1. At the same time, the total six groups of backlight sources 1 on both sides of the conveyor belt 2 are symmetrically arranged with respect to the conveyor belt 2.

[0026] A light source array is provided on the surface of each group of backlight sources 1 facing the glass container 3. As Figure 2 shown, the backlight array is composed of a number of horizontal light source modules 5 arranged in the vertical direction. All the horizontal light source modules 5 are sequentially fixed in the vertical direction to form a rectangular light source array. Each group of horizontal light source modules 5 further includes a plurality of backlight units 4 arranged side by side.

[0027] Furthermore, in combination with Figure 3 , each backlight unit 4 is further composed of two backlight sub-units 7. The two backlight sub-units 7 preferably adopt a rectangular structure, and the two backlight sub-units 7 form a square backlight unit 4. Based on the center line 6 (virtual line) in the vertical direction of the horizontal light source module 5, the same number of backlight units 4 are arranged on both sides of the center line 6. The number of backlight units 4 on both sides of the center line 6 is preferably an even number.

[0028] For the convenience of description, the backlight sub-units 7 extending from the center line 6 of the horizontal light source module 5 to both sides are sequentially named as: the first sub-unit, the second sub-unit,..., the Nth sub-unit. Therefore, two first sub-units, two second sub-units,..., two Nth sub-units are arranged symmetrically with respect to the center line 6 on both sides. And under the drive of the control circuit of this backlight source system, the two first sub-units are simultaneously turned on or off, the two second sub-units are simultaneously turned on or off,..., the two Nth sub-units are simultaneously turned on or off.

[0029] As Figure 4 shown, the control circuit of this backlight source system includes a host computer. A communication module is provided at the output port of the host computer, and the output end of the communication module is connected to the input end of the single-chip microcomputer. Two programmable logic units are connected to the output port of the single-chip microcomputer: the first programmable logic unit and the second programmable logic unit. The output end of the first programmable logic unit is connected to a number of driving units: the first driving unit, the second driving unit,..., the Nth driving unit; the output end of the second programmable logic unit is also connected to a number of driving units: the first driving unit, the second driving unit,..., the Nth driving unit.

[0030] At the output end of any one of the driving units in the first programmable logic unit (and the second programmable logic unit), two LED units are connected: a first LED unit and a second LED unit. Any one of the driving units drives the first LED unit and the second LED unit connected thereto to be lit or extinguished simultaneously. Any one of the driving units drives the first LED unit and the second LED unit connected thereto corresponding to two first sub-units (two second sub-units, …, two Nth sub-units) symmetrically arranged about the center line 6 in the above-mentioned horizontal light source module 5.

[0031] And as is well known in the art, the first LED unit and the second LED unit can be an independent LED light source, or can be a light source array formed by connecting multiple LEDs in series.

[0032] The above-mentioned communication module is implemented by using the well-known TwinCAT communication module in the art, the single-chip microcomputer is implemented by using a microprocessor with the model number PIC32MX440F256H-80I / PT, and both the first programmable logic unit and the second programmable logic unit are implemented by using an FPGA (Field Programmable Gate Array) chip with the model number LFXP2-5E-5QN208C. The signal output end of the single-chip microcomputer is connected to the input end of the gate circuit in the FPGA chip, and the output end of the gate circuit in the FPGA chip is connected to each driving unit.

[0033] The driving units (the first driving unit, the second driving unit, …, the Nth driving unit) are implemented by using the well-known LED driving motors in the art, and their circuit structures are common knowledge and conventional means in the art, and will not be elaborated here.

[0034] The specific working process and working principle are as follows:

[0035] First, design various patterns reflected by the light source array in the background light source 1, and then determine the lighting state of each backlight sub-unit 7 when forming the corresponding pattern according to the pattern, and edit the lighting state of each backlight sub-unit 7 when forming the corresponding pattern through the host computer.

[0036] When the glass container 3 passes through the backlight unit 4 driven by the conveyor belt 2, the host computer controls the backlight unit 4 to form backlight sources of different patterns. At this time, the host computer outputs a control signal to the single-chip microcomputer through the communication module, and the single-chip microcomputer further outputs a control signal to the first programmable logic unit and the second programmable logic unit. At this time, the switching states of different gate circuits in the first programmable logic unit and the second programmable logic unit change, forming several bright areas 8 and dark areas 9, thereby forming backlight sources of different patterns, such as Figure 5 the strip-shaped light source shown, or as Figure 6The "chessboard"-shaped backlight source formed by different grid-like intervals shown can theoretically form a backlight source of any shape with a mirror-symmetrical structure.

[0037] When each glass container 3 passes through the backlight unit 4, the backlight unit 4 forms backlight sources of different multiple patterns respectively, and then image acquisition is performed by an industrial camera arranged on the side of the backlight unit 4, and then detection of low-contrast defects of the glass container 3 is realized based on the acquired images.

[0038] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A background light source system for low-contrast defect detection of glass containers, comprising a background light source (1) and a control circuit for controlling the background light source (1) to light up or extinguish, characterized in that: A light source array is arranged on the end surface of the background light source (1) facing the glass container (3), and a plurality of symmetrically arranged LED light source groups are arranged in the light source array. A control circuit is connected to all the LED light source groups and controls each LED light source group to light up or extinguish, thereby forming a plurality of bright areas (8) and / or dark areas (9) in the light source array.

2. The background light source system for low-contrast defect detection of glass containers according to claim 1, characterized in that: The light source array is composed of a plurality of horizontal light source modules (5) arranged in sequence, each of the horizontal light source modules (5) comprising a plurality of backlight units (4), and all the backlight units (4) are arranged in a mirror-symmetrical manner with the center line (6) of the horizontal light source module (5) as a reference.

3. The background light source system for low-contrast defect detection of glass containers according to claim 2, characterized in that: Each backlight unit (4) is composed of two backlight sub-units (7), and each group of two backlight sub-units (7) arranged in mirror symmetry about the center line (6) forms a group of LED light sources.

4. The background light source system for low-contrast defect detection of glass containers according to claim 1, characterized in that: The background light sources (1) are symmetrically arranged on both sides of the travel path of the glass container (3).

5. The background light source system for low-contrast defect detection of glass containers according to claim 4, characterized in that: A conveyor belt (2) for conveying the glass containers (3) is arranged on a travel route of the glass containers (3).

6. The background light source system for low-contrast defect detection of glass containers according to claim 1, characterized in that: The control circuit includes a single chip microcomputer and a first programmable logic unit and a second programmable logic unit connected to the single chip microcomputer. The output end of the first programmable logic unit is connected to several driving units, and the output end of any driving unit is connected to a group of symmetrically arranged LED light source groups.

7. The background light source system for low-contrast defect detection of glass containers according to claim 1, characterized in that: The control circuit also includes a host computer, which is connected to the single-chip microcomputer via a communication module.

Images