CN108364287B - Foreign matter monitoring method and device and stamping system - Google Patents
Foreign matter monitoring method and device and stamping system Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012216 screening Methods 0.000 claims abstract description 68
- 238000004080 punching Methods 0.000 claims abstract description 51
- 238000012806 monitoring device Methods 0.000 claims abstract description 19
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Abstract
The invention relates to the technical field of monitoring, and discloses a foreign matter monitoring method, a foreign matter monitoring device and a stamping system. The foreign matter monitoring method comprises the steps of acquiring an image of a stamping area by using image acquisition equipment; screening out an interested area in the image of the stamping area according to the gray value information of the image of the stamping area; screening out a target area with the gray value within a target range in the region of interest; and judging whether foreign matters exist in the punching area or not according to the geometric characteristics of the target area. Therefore, whether foreign matters fall off in the punching area can be monitored by using an image gray scale recognition method, the manpower is reduced, and the monitoring accuracy is improved. The foreign matter monitoring device comprises image acquisition equipment, a backlight source, a controller and an alarm device. The stamping system comprises the foreign matter monitoring device and the stamping machine, and can accurately monitor whether foreign matters exist in the stamping area in real time, so that the labor is saved, and the safety of stamping production is guaranteed.
Description
Technical Field
The invention relates to the technical field of monitoring, in particular to a foreign matter monitoring method and device and a punching machine system.
Background
The punching machine is an efficient metal processing machine tool and is widely applied to part processing in multiple fields of machinery, automobiles, aerospace and the like. The press machine deforms the metal by closing the upper and lower dies to obtain a part of a prescribed shape. In the stamping process, parts such as screws on the die can fall onto the lower die due to vibration and the like, and the stamped waste materials can be adhered to the upper die in production and fall onto the lower die after being carried by the upper die. Because the lower die has the whole mould of destruction after these foreign matters can lead to the mould closure, needs the interior condition of real-time supervision mould, in case the foreign matters drop or the waste material flies, can in time shut down the clearance. At present, a lot of manufacturing enterprises often look over the condition in the mould through the workman of operation punching machine, discover the foreign matter by the operation workman and drop, in time shut down and get rid of the foreign matter. However, since the press machine is a continuous working machine and the press frequency is high, the actual need cannot be satisfied only by visual observation, and the labor intensity of workers increases.
Disclosure of Invention
A first object of the present invention is to provide a foreign matter monitoring method capable of monitoring whether or not foreign matter exists in a punching area of a punching machine in real time, with high accuracy and with reduced labor intensity of workers.
A second object of the present invention is to provide a foreign matter monitoring device that can realize the above-described foreign matter monitoring method, that can effectively monitor whether or not there is foreign matter in the press region of the press machine, and that has high accuracy.
The third objective of the present invention is to provide a stamping system, which includes the above foreign object monitoring device, and can accurately monitor whether a foreign object exists in a stamping area in real time, so as to save labor and ensure production safety.
The embodiment of the invention is realized by the following steps:
a foreign matter monitoring method applied to a press machine, comprising:
the method comprises the steps that image acquisition equipment and a backlight source are oppositely arranged on two sides of a stamping area, and images of the stamping area are acquired by the image acquisition equipment;
screening out an interested area in the image of the stamping area according to the gray value information of the image of the stamping area;
screening out a target area with the gray value within a target range in the region of interest;
and judging whether foreign matters exist in the punching area or not according to the geometric characteristics of the target area.
In one embodiment of the invention, after the image of the punching region is acquired by the image acquisition device, the image of the punching region is subjected to noise reduction and smoothing preprocessing.
In an embodiment of the present invention, screening out an area of interest in a stamped region image according to gray-scale value information of the stamped region image specifically includes:
determining a first preset gray value according to the maximum gray value in the image of the stamping region;
screening out a region with a gray value larger than a first preset gray value in the punching region, wherein the first preset gray value is smaller than the maximum gray value;
and identifying the maximum outer contour of the area with the gray value larger than the first preset gray value in the punching area.
In an embodiment of the present invention, the screening out the region of interest in the stamped region image according to the gray-scale value information of the stamped region image specifically further includes:
and performing first filling treatment, corrosion treatment and second filling treatment on the area in the maximum outer contour.
In an embodiment of the present invention, screening out a target region with a gray value within a target range in an area of interest specifically includes:
determining a second preset gray value according to the minimum gray value in the image of the stamping region;
screening out a region with the gray value smaller than a second preset gray value in the region of interest as a target region; the second preset gray value is larger than the minimum gray value and smaller than the first preset gray value.
In one embodiment of the invention, an alarm signal is issued when it is determined that a foreign object is present in the stamped area.
The invention provides a foreign matter monitoring device, which is applied to a punching machine and comprises:
a backlight source;
the image acquisition equipment is arranged opposite to the backlight source at intervals and is used for acquiring an image of the stamping area;
an alarm device; and
the controller is electrically connected with the image acquisition equipment and the alarm device;
the controller comprises an area screening module for screening the region of interest, a target screening module for screening a target area from the region of interest, a judging module for judging whether foreign matters exist according to the geometric characteristics of the target area, and an alarm control module for controlling the alarm device.
In one embodiment of the present invention, the region screening module includes:
the first gray level calculation unit is used for determining a first preset gray level value according to the maximum gray level value in the image of the stamping area, and the first preset gray level value is smaller than the maximum gray level value in the image of the stamping area;
the screening unit is used for screening out an area with a gray value larger than a first preset gray value in the stamping area image;
the outline identification unit is used for identifying the maximum outline of an area with the gray value larger than a first preset gray value in the stamping area image;
and the area processing unit is used for optimizing the area in the maximum outer contour.
In one embodiment of the invention, the target screening module comprises:
the second gray-scale calculating unit is used for determining a second preset gray-scale value according to the minimum gray-scale value in the image of the stamping region, and the second preset gray-scale value is larger than the minimum gray-scale value in the image of the stamping region and smaller than the first preset gray-scale value;
and the target identification unit is used for identifying the area with the gray value smaller than the second preset gray value in the interested area image so as to obtain the target area.
The invention relates to a stamping system, which comprises a stamping machine and the foreign matter monitoring device; the punching machine comprises an upper die and a lower die, a punching area is formed between the upper die and the lower die, and the backlight source and the image acquisition equipment are located on two sides of the punching area and are arranged oppositely.
The embodiment of the invention has the beneficial effects that:
the foreign matter monitoring method comprises the steps of oppositely arranging image acquisition equipment and a backlight source at two sides of a stamping area, and acquiring an image of the stamping area by using the image acquisition equipment; screening out an interested area in the image of the stamping area according to the gray value information of the image of the stamping area; screening out a target area with the gray value within a target range in the region of interest; and judging whether foreign matters exist in the punching area or not according to the geometric characteristics of the target area. Therefore, whether foreign matters fall off in the punching area can be monitored by using an image gray scale recognition method, the manpower is reduced, and the monitoring accuracy is improved.
The foreign matter monitoring device comprises image acquisition equipment, a backlight source, a controller and an alarm device, and can realize the monitoring method and send out an alarm signal when judging that foreign matters exist.
The stamping system provided by the embodiment of the invention comprises the foreign matter monitoring device and the stamping machine, so that whether foreign matters exist in the stamping area can be accurately monitored in real time, the labor is saved, and the safety of stamping production is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a stamping system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for monitoring foreign objects according to an embodiment of the present invention;
FIG. 3 is a flow chart of acquiring an image of a stamped area in one embodiment of the present disclosure;
FIG. 4 is a flow chart of screening out regions of interest in a stamped region image in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart illustrating screening a target area according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a controller in accordance with one embodiment of the present invention;
FIG. 7 is a diagram illustrating an image receiving module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a region screening module in accordance with an embodiment of the present invention;
FIG. 9 is a diagram of a target screening module in accordance with an embodiment of the present invention.
In the figure: 10-a stamping system; 11-lower mould; 12-a backlight source; 13-an image acquisition device; 14-a height adjustment mechanism; 15-an alarm device; 16-a workpiece; 100-a controller; 110-an image receiving module; 112-a receiving unit; 114-a pre-processing unit; 120-region screening module; 122-a first gray scale calculation unit; 124-screening unit; 126-contour identification unit; 128-a regional processing unit; 130-target screening module; 132-a second gray-scale calculation unit; 134-a target identification unit; 140-a judgment module; 150-alarm control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like refer to orientations or positional relationships based on those shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic view of a stamping system 10 according to an embodiment of the present invention. Referring to fig. 1, in one embodiment of the present invention, a stamping system 10 includes a stamping press and a foreign object monitoring device. The press machine includes an upper die (not shown) and a lower die 11, and a press area is formed between the upper die and the lower die 11. In an alternative case, the work 16 in a belt shape is fed in a longitudinal direction to be placed on the upper surface of the lower die 11 and press-molded by the upper die.
The foreign matter monitoring device comprises an image acquisition device 13, a backlight source 12, an alarm device 15 and a controller 100 electrically connected with the image acquisition device 13 and the alarm device 15, wherein the controller 100 is also electrically connected with the punching machine. The image acquisition device 13 and the backlight source 12 are respectively arranged at two sides of the stamping area, preferably at two sides of the strip material conveying direction, the light of the backlight source 12 faces the image acquisition device 13, and the lens of the image acquisition device 13 faces the backlight source 12. The image acquisition device 13 is used for acquiring an image of the stamping area, the backlight source 12 is used for providing enough light for the image acquisition device 13 to improve the brightness of the whole stamping area, and when a foreign object falls between the upper die and the lower die 11, the light provided by the backlight source 12 is shielded, so that the image acquisition device 13 captures an area with a lower gray value, and the existence of the foreign object in the stamping area is judged.
When the controller 100 determines that there is a foreign object, the controller 100 controls the alarm device 15 to issue an alarm message to alert a worker that an abnormality occurs in the punching operation. In one embodiment of the present invention, the controller 100 may also stop the operation of the press machine when the presence of the foreign object is detected, thereby preventing a production accident.
In one embodiment of the present invention, the image capturing device 13 is an industrial camera, which is disposed on the height adjusting mechanism 14, and the height adjusting mechanism 14 includes a cylinder (not shown in the figure) electrically connected to the controller 100, so that the height of the image capturing device 13 is adjustable. In the embodiment of fig. 1, a plurality of image capturing devices 13, for example, 4 image capturing devices, may be arranged along the conveying direction of the workpiece 16, and in other embodiments, the number of the image capturing devices 13 may be increased or decreased according to actual situations; the cylinder of the height adjusting mechanism 14 may be replaced by a hydraulic cylinder, a linear motor, or other driving devices, and the image capturing device 13 may also be disposed on a fixed bracket with a non-adjustable height.
Preferably, the height of the backlight 12 should be greater than the maximum spacing of the upper and lower dies 11 so that the entire stamped area can be illuminated, the backlight 12 being optionally an LED lamp.
In one embodiment of the present invention, the controller 100 may be a single chip, a PLC, or a PC storing program modules. The alarm device 15 may emit an alarm signal including a flashing light and an alarm sound.
Fig. 2 is a flowchart of a foreign object monitoring method according to an embodiment of the invention. Referring to fig. 2 in combination with fig. 1, in an embodiment of the invention, the method for monitoring foreign matters can be applied to the above-mentioned press system 10, and includes:
and S1, oppositely arranging the image acquisition equipment 13 and the backlight source 12 at two sides of the punching area, and acquiring the image of the punching area by using the image acquisition equipment 13.
And S2, screening out the region of interest in the punching area image according to the gray value information of the punching area image.
Taking the foreign object monitoring apparatus provided in the embodiment of the present invention as an example, the controller 100 of the foreign object monitoring apparatus may include a region screening module to screen out the region of interest by using the gray value of the image. Since the image content of the punching area may include an uninteresting portion, for example, when the upper die is pressed down, the image of the upper die is in the image, and the region of interest is often a portion between the upper die and the lower die 11, the foreign matter in the region of interest is likely to affect the punching operation, and therefore, only the foreign matter in the region of interest is monitored.
And S3, screening out the target area with the gray value within the target range in the region of interest.
Taking the foreign object monitoring apparatus provided in the embodiment of the present invention as an example, the controller 100 of the foreign object monitoring apparatus may include a target screening module to screen out a target region with a gray value in a target range from the region of interest.
And S4, judging whether foreign matters exist in the punching area according to the geometric characteristics of the target area.
Taking the foreign object monitoring device provided in the embodiment of the present invention as an example, the controller 100 of the foreign object monitoring device may include a determining module for determining whether the geometric characteristic of the target region is caused by the foreign object, so as to determine whether the foreign object exists in the stamped region, where the determining criterion may be a size and/or a shape, for example, a size in a preset direction is between 0.5cm and 10cm, and the foreign object may be determined, and further, for example, a long and narrow strip may be a strip-shaped workpiece 16, and therefore, the foreign object may not be determined.
In one embodiment of the present invention, step S41 is performed when it is determined that foreign matter is present: sending out an alarm signal; step S42 is executed when it is determined that there is no foreign object: foreign matter monitoring is continued. It should be appreciated that step S41 may also include stopping the press operation in some embodiments of the present invention.
FIG. 3 is a flow chart of acquiring an image of a stamped area in one embodiment of the invention. Referring to fig. 3, in an embodiment of the present invention, step S1 may include:
and S11, receiving the punching area image acquired by the image acquisition device 13.
And S12, carrying out noise reduction and smoothing pretreatment on the received punching area image.
Taking the foreign object monitoring apparatus provided in the embodiment of the present invention as an example, the controller 100 of the foreign object monitoring apparatus may include a receiving unit and a preprocessing unit to implement step S11 and step S12, respectively.
FIG. 4 is a flow chart illustrating screening of regions of interest in a stamped region image according to an embodiment of the present invention. Referring to fig. 4, in an embodiment of the present invention, step S2 may specifically include:
and S21, determining a first preset gray value according to the maximum gray value in the image of the punching area.
And S22, screening out the areas with the gray values larger than the first preset gray value in the punching areas. Wherein the first preset gray value is smaller than the maximum gray value.
And S23, identifying the maximum outer contour of the area with the gray value larger than the first preset gray value in the punching area.
And S24, performing first filling treatment, corrosion treatment and second filling treatment on the area in the maximum outer contour.
Taking the foreign object monitoring apparatus in the embodiment of the present invention as an example, the region screening module in the controller 100 may include a first gray scale calculation unit, a screening unit, a contour recognition unit, and a region processing unit to perform steps S21, S22, S23, and S24, respectively. Due to the adoption of the backlight source 12, the gray value of the area between the upper die and the lower die 11 is high, the brightness is high, and the area is screened out to be used as the region of interest, so that the outline of the region of interest can be understood to change in real time in the moving process of the upper die. The first preset gradation value may be obtained by subtracting an offset from the maximum gradation value. For example, the maximum gray-level value is 220, the offset 20 can be taken, the first preset gray-level value is 200, and the standard of the region of interest is the region with the gray-level values of 200-220. Since there may be a foreign object in the region of interest, the light from the backlight 12 is blocked, and the gray scale value displayed on the image is low. In this case, the low gray value region is screened out by the screening method, and therefore, in order to reserve the target region to be monitored, the maximum outer contour of the region in the stamped region having the gray value greater than the first preset gray value is identified, and all the ranges within the maximum outer contour are used as the region of interest.
Specifically, step S23 may include identifying the contour of the region in the stamped region with a gray value greater than the first preset gray value by using an edge identification algorithm, and then screening out the maximum contour by using a conditional screening operator. Step S24 may include performing a first fill process on the outline using a flood fill algorithm; then, carrying out corrosion treatment to eliminate reflection interference at the edge; and performing second filling treatment on the image subjected to the corrosion treatment to obtain a high-quality region of interest.
FIG. 5 is a flowchart illustrating a process of screening out a target area according to an embodiment of the present invention. Referring to fig. 5, in an embodiment of the present invention, step S3 may specifically include:
and S31, determining a second preset gray value according to the minimum gray value in the image of the punching area.
And S32, screening out the area with the gray value smaller than the second preset gray value in the area of interest as the target area. The second preset gray value is larger than the minimum gray value but smaller than the first preset gray value.
Taking the foreign object monitoring apparatus in the embodiment of the present invention as an example, the target screening module in the controller 100 may include a second gray level calculating unit and a target identifying unit to implement step S31 and step S32, respectively. Before performing the step S32, the region of interest may be cut out and then the step S32 may be performed. The second preset gray-scale value can be obtained by adding an offset to the minimum gray-scale value, for example, the minimum gray-scale value is 40, the offset is 20, then the second preset gray-scale value is 60, and the target region in the region of interest is a region with gray-scale values of 40-60.
Fig. 6 is a schematic diagram of the controller 100 according to an embodiment of the invention. Referring to fig. 6, in an embodiment of the present invention, the controller 100 includes:
and the image receiving module 110 is configured to receive the image information sent by the image capturing device 13.
And a region screening module 120 for screening out the region of interest.
And an object screening module 130 for screening out the object region from the region of interest.
And a judging module 140, configured to judge whether a foreign object exists according to the geometric features of the target area.
The alarm control module 150 is used for controlling the alarm device 15 to give an alarm when the foreign matters are judged to exist; in some embodiments of the invention, the alarm control module 150 may also control the press to stop operating.
Fig. 7 is a diagram illustrating an image receiving module 110 according to an embodiment of the invention. The image receiving module 110 may include:
and a receiving unit 112, configured to receive the punching area image acquired by the image acquisition device 13.
And a preprocessing unit 114 for performing noise reduction and smoothing preprocessing on the received punched area image.
Fig. 8 is a diagram illustrating the region filtering module 120 according to an embodiment of the invention. The region screening module 120 may include:
the first gray-scale calculating unit 122 is configured to determine a first preset gray-scale value according to the maximum gray-scale value in the image of the punching region.
And the screening unit 124 is used for screening out the areas with the gray values larger than the first preset gray value in the punching areas. Wherein the first preset gray value is smaller than the maximum gray value.
And the outline identification unit 126 is used for identifying the maximum outline of the area with the gray value larger than the first preset gray value in the punching area.
And the area processing unit 128 is used for carrying out first filling processing, corrosion processing and second filling processing on the area in the maximum outer contour so as to obtain a good-quality region of interest.
FIG. 9 is a diagram of the object screening module 130 according to an embodiment of the invention. The object screening module 130 may include:
and the second gray-scale calculating unit 132 is configured to determine a second preset gray-scale value according to the minimum gray-scale value in the image of the punching region.
And the target identification unit 134 is used for screening out the region of the interest region with the gray value smaller than the second preset gray value as the target region. The second preset gray value is larger than the minimum gray value but smaller than the first preset gray value.
When the target area is selected, the determining module 140 may determine whether the target area is caused by the foreign object in the punching area according to the size or/and shape of the target area, and in some cases, the target area is not generated by the foreign object; in some cases, the foreign matter is too fine in size to be ignored. When the foreign matter is judged to exist, the alarm control module 150 controls the alarm device 15 to send out an alarm signal to remind a worker that the stamping operation is abnormal, and if the foreign matter is judged not to exist, the monitoring is continued.
In summary, the foreign object monitoring method of the present invention includes arranging the image collecting device and the backlight source at two sides of the punching area, and acquiring an image of the punching area by using the image collecting device; screening out an interested area in the image of the stamping area according to the gray value information of the image of the stamping area; screening out a target area with the gray value within a target range in the region of interest; and judging whether foreign matters exist in the punching area or not according to the geometric characteristics of the target area. Therefore, whether foreign matters fall off in the punching area can be monitored by using an image gray scale recognition method, the manpower is reduced, and the monitoring accuracy is improved.
The foreign matter monitoring device comprises image acquisition equipment, a backlight source, a controller and an alarm device, and can realize the monitoring method and send out an alarm signal when judging that foreign matters exist.
The stamping system provided by the embodiment of the invention comprises the foreign matter monitoring device and the stamping machine, so that whether foreign matters exist in the stamping area can be accurately monitored in real time, the labor is saved, and the safety of stamping production is guaranteed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A foreign matter monitoring method applied to a press machine, characterized by comprising:
arranging image acquisition equipment and a backlight source on two sides of a stamping area oppositely, and acquiring an image of the stamping area by using the image acquisition equipment;
screening out an interested area in the stamping area image according to the gray value information of the stamping area image;
screening out a target area with a gray value within a target range in the region of interest;
judging whether foreign matters exist in the stamping area or not according to the geometric characteristics of the target area;
the screening of the region of interest in the stamped region image according to the gray value information of the stamped region image specifically comprises:
determining a first preset gray value according to the maximum gray value in the image of the stamping region;
screening out an area with a gray value larger than the first preset gray value in the punching area, wherein the first preset gray value is smaller than the maximum gray value;
and identifying the maximum outer contour of the area with the gray value larger than the first preset gray value in the punching area.
2. The foreign matter monitoring method according to claim 1, characterized in that:
and after the image acquisition equipment is used for acquiring the image of the punching area, carrying out noise reduction and smoothing pretreatment on the image of the punching area.
3. The foreign matter monitoring method according to claim 1, wherein the screening out the region of interest in the punched area image according to the gray value information of the punched area image specifically further comprises:
and carrying out first filling treatment, corrosion treatment and second filling treatment on the area in the maximum outer contour.
4. The foreign matter monitoring method according to claim 1, wherein the screening out of the target region in the region of interest, the target region having a gray value within a target range, specifically comprises:
determining a second preset gray value according to the minimum gray value in the image of the stamping region;
screening out a region with the gray value smaller than a second preset gray value in the region of interest as the target region; the second preset gray value is larger than the minimum gray value and smaller than the first preset gray value.
5. The foreign matter monitoring method according to any one of claims 1 to 4, characterized in that:
and when the stamping area is judged to have foreign matters, an alarm signal is sent out.
6. A foreign matter monitoring device is applied to a punching machine, and is characterized by comprising:
a backlight source;
the image acquisition equipment is arranged opposite to the backlight source at intervals and is used for acquiring an image of the stamping area;
an alarm device; and
the controller is electrically connected with the image acquisition equipment and the alarm device;
the controller comprises an area screening module for screening an interested area, a target screening module for screening a target area from the interested area, a judging module for judging whether foreign matters exist according to the geometric characteristics of the target area and an alarm control module for controlling the alarm device;
the region screening module comprises:
the first gray level calculation unit is used for determining a first preset gray level value according to the maximum gray level value in the punched area image, wherein the first preset gray level value is smaller than the maximum gray level value in the punched area image;
the screening unit is used for screening out an area with a gray value larger than a first preset gray value in the stamping area image;
and the outline identification unit is used for identifying the maximum outline of the area with the gray value larger than the first preset gray value in the stamping area image.
7. The foreign object monitoring device of claim 6, wherein the area screening module further comprises:
and the area processing unit is used for optimizing the area in the maximum outer contour.
8. The foreign object monitoring device according to claim 6, wherein the target screening module includes:
the second gray-scale calculating unit is used for determining a second preset gray-scale value according to the minimum gray-scale value in the image of the punched area, wherein the second preset gray-scale value is larger than the minimum gray-scale value in the image of the punched area and smaller than the first preset gray-scale value;
and the target identification unit is used for identifying the area with the gray value smaller than the second preset gray value in the interested area image so as to obtain a target area.
9. A press system characterized by comprising a press machine and the foreign matter monitoring device according to any one of claims 6 to 8; the punching machine comprises an upper die and a lower die, a punching area is formed between the upper die and the lower die, and the backlight source and the image acquisition equipment are located on two sides of the punching area and are arranged oppositely.
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| CN111751898A (en) * | 2020-07-03 | 2020-10-09 | 广东科学技术职业学院 | Device and method for detecting whether core print falls off |
| CN112308072B (en) * | 2020-11-06 | 2023-05-12 | 中冶赛迪信息技术(重庆)有限公司 | Scrap steel stock yard scattered material identification method, system, electronic equipment and medium |
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| CN104616275B (en) * | 2013-11-04 | 2017-08-25 | 北京兆维电子(集团)有限责任公司 | A kind of defect inspection method and device |
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