Detection device based on infrared backlight and industrial printing equipment

Abstract

The utility model belongs to the technical field of machine vision application, overcomes the defects that in the prior art, accurate positioning characteristics cannot be obtained, foreign matter cannot be accurately recognized, and product compatibility is narrow, and provides a detection device based on infrared backlight and industrial printing equipment. The hollow frame comprises a frame body and an opening defined by the frame body; the infrared light source is arranged in the frame body; the light-transmitting supporting plate is arranged in the opening, the surface of the light-transmitting supporting plate is used for supporting the object, the visual detection equipment is arranged to be located over the object, the shooting range of the visual detection equipment covers the whole surface of the light-transmitting supporting plate, and infrared light emitted by the infrared light source penetrates through the supporting plate and irradiates the back face of the object so that the area contour of the object can be highlighted; and the visual detection equipment extracts positioning feature information or / and foreign matter existence information according to the region contour. The device has the advantages of being capable of obtaining accurate positioning characteristics, capable of accurately identifying foreign matters and wide in product compatibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to machine vision application technical field especially based on infrared backlight's detection device and industrial printing equipment. BACKGROUND

[0002] At present, machine vision systems are widely used in multiple fields, for example, in the industrial printing field of printed objects such as knitted badge type printed objects, the machine vision system on the market usually uses a camera to vertically shoot the workbench supporting the printed object from above to position the printed object or detect foreign matter on the printed object. The conventional lighting method of the light source of the machine vision system includes opening hole backlight from above or two strip lights from both sides. After detecting the printed object to achieve positioning and obtain the positioning feature, the position of the printed pattern on the printed object is adjusted according to the offset and angle data in the positioning feature, and finally output to the printer for printing. During the whole process, the accuracy and stability of positioning are the key factors affecting the printing quality.

[0003] However, the conventional lighting method used on the market is prone to uneven lighting and changes in light intensity, both of which can cause unstable target positioning information and ultimately result in positioning failure or large deviation. Figure 1 As shown in the figure, when using the opening hole backlight in the conventional lighting method to light from above the printed object, the extracted green texture information is blurred and unclear, which can introduce interference information on the cloth. Moreover, when the lighting intensity changes, the outline information is prone to extraction loss or failure, and the image processing effect is unstable. In addition, the specificity of the outline is not strong, and the direction information cannot be accurately fed back, resulting in a large amount of outline and long calculation time. Because Figure 1 The poor precision of outline information extraction leads to unclear and distinct outline of image effect, which further leads to Figure 2 As shown in the figure, the processing effect cannot accurately process the outline, so the processing effect based on the image effect cannot comprehensively process the outline and is prone to color breakage and other adverse visual effects. Moreover, when the knitted texture is too complex, the conventional lighting method will interfere with the outline information, which will also cause long and unstable positioning time, and the product application compatibility is limited. In addition, due to the conventional lighting method of the existing machine vision system, foreign matter that may exist on the printed object cannot be identified or accurately positioned, which may cause the foreign matter to affect the printing quality. Therefore, the conventional lighting method has the disadvantages of being unable to obtain accurate positioning features, unable to accurately identify foreign matter, and narrow product compatibility.

[0004] Therefore, it is urgent to provide a detection device based on infrared backlight and an industrial printing equipment that can obtain accurate positioning features, accurately identify foreign matter, and have extensive product compatibility. UTILITY MODEL CONTENT

[0005] The utility model discloses to the above prior art exists's cannot obtain accurate positioning feature, cannot accurately identify foreign matter, product compatibility is narrow's insufficient, for realizing the utility model of one purpose, provide a kind of detection device based on infrared backlight, it include: visual inspection equipment;Hollow frame, including frame and the opening surrounded by frame;Infrared light source, arrangement is in frame;Light-transmitting support plate, arrangement is in opening and plate surface is used to support object, visual inspection equipment is set to be located in the just above object and the shooting range covers entire plate surface, and infrared light emitted by infrared light source transmits through support plate and is irradiated to the back of object to make the regional profile of object stand out, and visual inspection equipment extracts positioning feature information or / and foreign matter information according to regional profile.

[0006] Further, the back adhesive is arranged on the plate surface, and the back adhesive allows the infrared light to transmit through, and the object is pasted on the support plate by the back adhesive.

[0007] Further, the frame includes a rectangular bottom plate and vertical plates fixed to each side of the bottom plate, the upper ends of the vertical plates collectively surround a rectangular opening, and the infrared light source is embedded in the bottom plate.

[0008] Further, the support plate is a flat plate with a hollow cavity, a plurality of air suction holes are arranged on the plate surface, an air suction interface is arranged on a vertical plate and communicates with the hollow cavity, the object is placed on the plate surface and covers at least part of the air suction holes, the air suction interface is connected with an air suction device, and the air suction device sucks air outward from the air suction interface, so that the object is adsorbed on the plate surface, and the object is fixed in size and air permeability meets the adsorption and fixing requirements.

[0009] Further, the plurality of air suction holes are arranged in a circle along the edge of the flat plate and form a rectangle.

[0010] Further, a plurality of first magnetic members are arranged in the support plate, a plurality of second magnetic members that are opposite to the first magnetic members and have different magnetic properties are arranged on the object placed on the plate surface, and the pairs of first magnetic members and second magnetic members are attracted to fix the object on the flat plate, and the object is an object whose air permeability does not meet the adsorption and fixing requirements.

[0011] Further, the first magnetic members are inlaid in the plate surface or embedded in the back surface opposite to the plate surface, or the first magnetic members and the second magnetic members are arranged in the same four rectangular edges and symmetrically on two opposite edges.

[0012] Further, the visual inspection equipment is a face array camera or a line array camera and a scanning mechanism driving the movement thereof.

[0013] In order to realize another purpose of the utility model, provide a kind of industrial printing equipment, including printing trolley and by the detection device based on infrared backlight of any one, printing trolley is printed according to the positioning feature information or / and foreign matter information to object.

[0014] Further, the object includes knitted badge and paper.

[0015] The utility model has the advantages that:

[0016] The utility model discloses the detection device based on infrared backlight and industrial printing equipment are by adopting infrared light source arranged in frame to light from the object below by support plate in back light mode, are not disturbed by ambient light, can obtain stable and accurate positioning feature, greatly improve the accuracy and stability of positioning, simultaneously, can filter out interference information in background, shorten positioning time consumption, especially for the situation that object is knitted badge, utilize the light effect of significant improvement, can highlight badge area profile, filter out cloth piece texture information, can stably and accurately extract positioning feature information. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawing needed to be used in the utility model embodiment, for the ordinary skilled person in the art, without paying creative labor, can also obtain other drawings according to these drawings, these are within the protection scope of the utility model.

[0018] Figure 1 For the image effect diagram of object obtained under the conventional lightening mode of the conventional machine vision system adopted by prior art;

[0019] Figure 2 For the processing effect diagram further obtained based on Figure 1 The image effect of object shown in the drawing;

[0020] Figure 3 For the overall structure perspective schematic view of the detection device based on infrared backlight provided by the utility model embodiment;

[0021] Figure 4 For the front view schematic view of the detection device based on infrared backlight provided by the utility model embodiment;

[0022] Figure 5 For the top view schematic view of one implementation mode of the detection device based on infrared backlight provided by the utility model embodiment;

[0023] Figure 6 For the top view schematic view of another implementation mode of the detection device based on infrared backlight provided by the utility model embodiment and in the state of not fixing object;

[0024] Figure 7 Another embodiment of the detection device based on infrared backlight provided by the utility model and the top view schematic diagram of the fixed object state;

[0025] Figure 8 The image effect diagram of the object obtained under the infrared backlight lighting mode adopted by the detection device based on infrared backlight provided by the utility model embodiment;

[0026] Figure 9 Based on Figure 8 The processing effect diagram further obtained by the image effect of the object shown in the figure;

[0027] Explanation of reference signs:

[0028] 1, visual inspection equipment;2, hollow frame;21, frame body;211, rectangular bottom plate;212, vertical plate;2121, air suction interface;22, opening;3, infrared light source;4, support plate;41, air suction hole;5, first magnetic part;6, second magnetic part;10, object. Specific implementation

[0029] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely below by combining the drawings in the utility model embodiment. It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements limited by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements. If there is no conflict, the utility model embodiments and various features in the embodiments can be combined with each other, and are all within the protection scope of the utility model.

[0030] Reference Figures 3 to 7 , as a purpose of the utility model, provide a kind of detection device based on infrared backlight, including visual inspection equipment 1, hollow frame 2, infrared light source 3 and light-transmitting support plate 4.The utility model embodiment, visual inspection equipment all uses area array camera, in addition, visual inspection equipment can also use line array camera and the scanning mechanism of driving its movement.Hollow frame 2 includes frame body 21 and the opening 22 surrounded by frame body 21.Infrared light source 3 is arranged in frame body 21.Support plate 4 is arranged in opening 22 and plate surface is used to support object 10, since infrared light has penetrability, support plate 4 can be colored or transparent, need to know, the object 10 can be the piece to be printed, the piece to be measured etc.for needing to be identified and positioned by detection device to profile, foreign matter identification to further carry out corresponding printing, ranging etc.processing, visual inspection equipment 1, for example, can be movably set to be located in the upper of object 10 and the shooting range covers entire plate surface, infrared light emitted by infrared light source 3 transmits through support plate 4 and is irradiated to the back of object 10, that is, light, so that the regional profile of object 10 is highlighted, visual inspection equipment 1 extracts positioning feature information or / and foreign matter information according to regional profile.

[0031] Therefore, the detection device based on infrared backlight provided by the utility model can obtain one or more of the following beneficial technical effects: 1: not affected by environmental light, stable and accurate positioning features can be obtained by using the photographing detection function of the visual inspection equipment, which greatly improves the accuracy and stability of positioning, and at the same time, interference information in the background can be filtered out, the positioning time is shortened, especially for the case where the object is a knitted badge, the lighting effect is significantly improved, the badge area profile is highlighted, and the texture information of the cloth piece is filtered out, so that the positioning feature information can be extracted stably and accurately; 2: since the interference information can be filtered out, the operator can save the process of erasing the interference area when making a positioning template, and the software is more convenient to use; 3: since the extracted profile information is accurate and reliable, accurate and reliable reference data can be provided for deformable correction positioning, and the quality of positioning printing of the object can be further improved; 4: for objects such as knitted badges, objects with different shapes and knitting methods are suitable, and the product compatibility is strong; 5: since the infrared light source is hiddenly installed in the frame, the structure is more compact and stable, and the stability of the device is increased; 6: since infrared light is invisible light, it will not cause light pollution and avoid causing visual impairment to operators who work for a long time.

[0032] Please further refer to Figure 3 And Figure 4Preferably, a back adhesive is arranged on the surface of the plate, the back adhesive allows the infrared light to pass through, and the object 10 is pasted on the support plate 4 by the back adhesive. Thus, the object 10 is fixed by the back adhesive, which is simple and reliable, and the support plate 4 not only protects the infrared light source 3 as the back light, but also facilitates the cleaning of the back adhesive.

[0033] Please further refer to Figure 3 Preferably, the frame 21 comprises a rectangular bottom plate 211 and vertical plates 212 fixed on each side of the bottom plate 211, and the upper ends of each vertical plate 212 jointly form a rectangular opening 22. It can be known that the support plate 4 can be arranged in the opening 22 by interference fit with the opening 22, or by mounting on the steps provided at the upper ends of each support plate 4, or by mounting on the support posts provided at the four corners of the bottom plate 211, and the infrared light source 3 can be embedded in the bottom plate 211 by mounting in the groove provided on the bottom plate 211. Therefore, the frame 21 has a compact overall structure, the infrared light source 3 has high mounting stability and no light leakage is possible.

[0034] Please further refer to Figure 5 As an embodiment of the detection device based on infrared backlight, preferably, the support plate 4 is a flat plate with a hollow cavity, a plurality of air suction holes 41 are arranged on the surface of the plate, and an air suction interface 2121 is provided on a vertical plate 212 and communicates with the hollow cavity. The object 10 is placed on the surface of the plate and covers at least part of the air suction holes 41. The air suction interface 2121 is connected with an air suction device. The air suction device sucks air outward from the air suction interface 2121, so that the object 10 is adsorbed on the surface of the plate. The object 10 is an object 10 with a size adapted to the air suction hole 41 and a wind permeability meeting the adsorption and fixation requirements. The object 10 can be a paper sheet with general wind permeability. Thus, the object 10 such as a paper sheet with a standard size can be accurately and reliably adsorbed and fixed on the flat plate, so as to ensure the accurate and reliable positioning of the visual detection equipment 1.

[0035] Please further refer to Figure 5 Preferably, the plurality of air suction holes 41 are arranged in a circle along the edge of the flat plate and form a rectangle. In this way, uniform adsorption force can be provided for the object 10 such as a paper sheet, so as to ensure that the object 10 does not deform, such as wrinkling or bending.

[0036] Please further refer to Figure 6 and Figure 7As an embodiment of the detection device based on infrared backlight, preferably, a plurality of first magnetic members 5 are arranged in the support plate 4, a plurality of second magnetic members 6 which are opposite to the first magnetic members 5 and are magnetically different are arranged on the object 10 placed on the surface of the plate, and the pairs of first magnetic members 5 and second magnetic members 6 are attracted to fix the object 10 on the flat plate. The object 10 is an object 10 which does not meet the adsorption fixing requirement in terms of air permeability, and the object 10 can be cloth and other materials which are inconvenient to fix by adsorption. Thus, for the cloth and other materials with high air permeability, the adsorption force of the air suction is limited, and the magnetic adsorption method can ensure that the object 10 is fixed on the flat plate in a positioning manner.

[0037] Please further refer to Figure 6 and Figure 7 Preferably, the first magnetic members 5 are inlaid in the surface of the plate or embedded in the back surface opposite to the surface of the plate. Since the first magnetic members 5 are installed in an inlaid or embedded manner, the installation is firm, and the placement of the object 10 on the surface of the plate is not affected.

[0038] Please further refer to Figure 6 and Figure 7 Preferably, the first magnetic members 5 and the second magnetic members 6 are arranged in a symmetrical manner along the same four rectangular edges and two pairs of opposite edges. In this way, uniform adsorption force can be provided for the object 10 such as cloth and especially rectangular cloth, and deformation such as curling and folding of the object 10 can be prevented.

[0039] It should be noted that the above mainly describes the detection device based on infrared backlight in terms of accurate and reliable extraction of positioning feature information. The detection of the presence or absence of foreign matter can also be known by referring to the acquisition of the positioning feature information, which will not be described here. Therefore, the detection device based on infrared backlight can be applied to positioning of textiles and detection of the presence or absence of foreign matter.

[0040] As another object of the present application, the present application also provides an industrial printing equipment (not shown), which comprises a printing trolley and any one of the detection devices based on infrared backlight. The printing trolley prints the object 10 according to the positioning feature information or / and the information about the presence or absence of foreign matter. The industrial printing equipment can obtain the beneficial effects brought by any one of the detection devices based on infrared backlight, which will not be described here. Therefore, since the detection device accurately and reliably obtains the positioning feature information or / and the information about the presence or absence of foreign matter, the nozzle on the printing trolley can accurately spray the desired ink at the contour position, excellent printing quality can be obtained, and printing can be avoided when there is foreign matter, thereby avoiding waste of the object 10 due to misprinting.

[0041] Please refer to Figure 8 and Figure 9, preferably, the article 10 comprises a knitted badge and paper, thus, the industrial printing device can print the knitted badge with excellent quality by means of accurate and reliable contour positioning, in particular, compared with the prior art shown in Figure 1 and Figure 2 , Figure 8 it is shown that the contour information extraction is accurate, and the image effect is clear, Figure 9 it is shown that the contour processing is accurate, and the contour processing is comprehensive and the line color is continuous, thus, according to Figure 8 and Figure 9 , the detection device based on infrared backlight and the industrial printing device having the same have the advantages that the extracted contour information is accurate and reliable, specific, and can quickly and accurately capture the position information.

[0042] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A detection device based on infrared backlight, characterized in that, include: Visual inspection equipment; A hollow frame, comprising a frame body and an opening enclosed by the frame body; An infrared light source is arranged within the frame. A light-transmitting support plate is arranged in the opening, and the surface of the plate is used to support the object. The visual inspection device is positioned directly above the object and its shooting range covers the entire surface of the plate. The infrared light emitted by the infrared light source passes through the support plate and illuminates the back of the object, thereby highlighting the outline of the object. The visual inspection device extracts positioning feature information and / or information on the presence or absence of foreign objects based on the outline of the object.

2. The detection device according to claim 1, characterized in that, An adhesive backing is applied to the surface of the board, which allows infrared light to pass through, and the object is adhered to the support board by the adhesive backing.

3. The detection device according to claim 1, characterized in that, The frame includes a rectangular base plate and vertical plates fixed to each side of the base plate. The upper ends of each vertical plate together form a rectangular opening, and the infrared light source is embedded in the base plate.

4. The detection device according to claim 3, characterized in that, The support plate is a flat plate with a hollow cavity. Multiple air suction holes are provided on the surface of the plate. An air extraction port communicating with the hollow cavity is provided on a vertical plate. The object is placed on the surface of the plate and covers at least part of the air suction holes. The air extraction port is used to connect to an air extraction device. The air extraction device extracts air outward from the air extraction port, so that the object is adsorbed onto the surface of the plate. The object is an object whose size is adapted to the air suction holes and whose air permeability meets the adsorption and fixation requirements.

5. The detection device according to claim 4, characterized in that, The multiple air intake holes are arranged in a circle along the edge of the plate and are rectangular in shape.

6. The detection device according to claim 3, characterized in that, Multiple first magnetic elements are arranged in the support plate, and multiple second magnetic elements with opposite magnetic properties are arranged on the object placed on the surface of the plate. The pairs of first magnetic elements and second magnetic elements attract each other to fix the object on the plate. The object is an object whose air permeability does not meet the requirements for adsorption and fixation.

7. The detection device according to claim 6, characterized in that, The first magnetic element is embedded in the surface of the plate or in the back surface opposite to the surface of the plate, or the first magnetic element and the second magnetic element are arranged symmetrically along the same four rectangular sides.

8. The detection device according to claim 1, characterized in that, The visual inspection device is an area scan camera or a line scan camera and a scanning mechanism that drives its movement.

9. An industrial printing device, comprising a printing carriage and a detection device based on a vision inspection device as described in any one of claims 1-8, wherein the printing carriage prints the object according to the positioning feature information and / or the presence or absence of the foreign object.

10. The industrial printing equipment according to claim 9, characterized in that, The items include knitted badges and paper.

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