CN111220077A - Visual detection device and method for installation size of threaded hole of radiator - Google Patents
Visual detection device and method for installation size of threaded hole of radiator Download PDFInfo
- Publication number
- CN111220077A CN111220077A CN202010064391.9A CN202010064391A CN111220077A CN 111220077 A CN111220077 A CN 111220077A CN 202010064391 A CN202010064391 A CN 202010064391A CN 111220077 A CN111220077 A CN 111220077A
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- radiator
- threaded hole
- installation size
- cantilever
- industrial camera
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
Abstract
The invention discloses a visual detection device and a visual detection method for the installation size of a threaded hole of a radiator, which solve the problems of lower measurement precision and smaller measurement range in the prior art, and can realize the detection of the installation size such as the distance between threaded holes of the radiator, the length of diagonal lines of the threaded holes and the like in one-time image acquisition process by jointly detecting the size through a plurality of industrial cameras, thereby improving the detection efficiency of radiator products. The technical scheme is as follows: the measuring device comprises a measuring platform and a plurality of image acquisition assemblies, wherein the measuring platform is used for placing a radiator, and positioning rulers are symmetrically arranged on the measuring platform; the plurality of image acquisition assemblies are connected with the measuring platform in a sliding manner and are used for acquiring images of threaded holes of the radiator; the image acquisition assembly comprises a supporting column, the supporting column is connected with the industrial camera and the annular light source in a sliding mode, the industrial camera is located above the annular light source, and the industrial camera can acquire images of the lower area under the irradiation condition of the annular light source.
Description
Technical Field
The invention relates to the field of machine vision detection, in particular to a device and a method for visually detecting the installation size of a threaded hole of a radiator.
Background
The radiator is a heat exchange part in a cooling system and is generally assembled by a water inlet chamber, a water outlet chamber, a main radiating fin and a radiating core. The cooling liquid flows in the heat dissipation core and exchanges heat with the air outside the heat dissipation core, the outside air absorbs heat to raise the temperature, and the inside cooling liquid releases heat to lower the temperature, so that the radiator plays a role in heat dissipation. The large-sized heat sink is generally made of copper or aluminum, has a flat plate structure, and is widely used for heat dissipation of large-sized air conditioners, automobiles and the like. Such heat sinks need to be tested for critical fit and positioning dimensions when shipped from the factory.
At present, the sizes are detected one by one mainly by means of workers holding measuring tools, the efficiency is low, and the requirements of batch production are difficult to follow. In addition, because the measuring tool is adopted for contact type measurement, the measuring tool is inevitably worn, the measurement precision is reduced, and the measurement cost is increased. And the visual measurement mode of the single camera is limited by effective pixels of the camera, and the measurement range is smaller under the condition of higher precision requirement, so that the requirement of measuring the installation size of the threaded hole of the large radiator cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a visual detection device and a visual detection method for the installation size of a threaded hole of a radiator.
The invention adopts the following technical scheme:
a visual inspection device for the installation size of a threaded hole of a radiator comprises:
the measuring platform is used for placing a radiator, and positioning rulers are symmetrically arranged on the surface of the measuring platform;
the image acquisition assemblies are connected with the measuring platform in a sliding manner and are used for acquiring images of threaded holes of the radiator; the image acquisition assembly comprises a supporting column, the supporting column is connected with the industrial camera and the annular light source in a sliding mode, the industrial camera is located above the annular light source, and the industrial camera can acquire images of the lower area under the irradiation condition of the annular light source.
Furthermore, support column one end is connected with the base with measuring platform sliding connection, the base is equipped with the location pointer with the corresponding one side of location scale.
Further, the industrial camera is mounted at the end part of the first cantilever, and the annular light source is mounted at the end part of the second cantilever; the first cantilever and the second cantilever are respectively connected with the supporting column in a sliding manner.
Furthermore, the first cantilever is connected with the support column through a first guide block, and the distance for inserting the first cantilever into the first guide block is adjustable; the second cantilever is connected with the supporting column through the second guide block, and the distance of the second cantilever inserted into the second guide block is adjustable.
Furthermore, slide rails are symmetrically arranged on the surface of the measuring platform along the length direction.
Furthermore, a plurality of positioning grooves which are distributed along the transverse direction and the longitudinal direction are arranged between the slide rails.
Furthermore, a positioning pin is inserted into the positioning groove.
A visual detection method for the installation size of a threaded hole of a radiator adopts the detection device and comprises the following steps:
(1) calibrating and transforming the coordinates of an industrial camera in the image acquisition assembly, and unifying the industrial camera in a world coordinate system;
(2) adjusting the position of the positioning pin in the positioning groove to position the relative position of the radiator in the horizontal direction;
(3) the image acquisition assembly acquires an image of the radiator to be measured, and the image is processed to obtain the distance between threaded holes of the radiator and the length of an oblique diagonal line;
(4) and (4) repeating the steps (1) to (3) to finish the visual measurement of the installation size of the threaded hole of the radiator.
Further, in the step (3), preprocessing, graying processing and binarization processing are performed on the acquired image; and then, carrying out hole filling operation on the image, carrying out edge detection on the image after hole filling, searching the outline, and calculating the pixel coordinate of the threaded hole of the radiator by calculating the outline moment.
Further, after the pixel coordinates are obtained, the coordinates are converted into world coordinate system coordinates according to calibration; and calculating the distance between the threaded holes of the radiator and the length of the diagonal line through coordinates under a world coordinate system.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, 4 groups of industrial cameras are used for jointly acquiring images, and the industrial cameras acquire images of the lower area under the irradiation condition of the annular light source, so that compared with manual measuring tool measurement and monocular camera measurement, the measuring efficiency and precision can be effectively improved;
(2) the image acquisition assembly is provided with a positioning pointer, the measuring platform is provided with a positioning scale, and the relative position of the image acquisition assembly in the horizontal direction of the measuring platform is determined by the cooperation of the positioning pointer and the positioning scale;
(3) the measuring platform is provided with a plurality of positioning grooves, positioning pins which can slide along the grooves can be inserted into the positioning grooves, and the positioning pins are in contact with the side edges of the flat plate type radiator to ensure the relative position of the flat plate type radiator during measurement;
(4) according to the invention, the center coordinates of the threaded holes in the image are extracted and subjected to coordinate transformation, and the length average value is calculated for multiple times, so that the mounting sizes of the threaded hole spacing, the threaded hole diagonal length and the like of the radiator can be detected in one image acquisition process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic overall structure diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an image capturing assembly according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a measurement platform according to a first embodiment of the present invention;
FIG. 4 is a schematic view of measurement calibration according to a second embodiment of the present invention;
the system comprises an image acquisition assembly, an industrial camera 1-1, a lens 1-2, an annular light source 1-3, a first cantilever 1-4, a second cantilever 1-5, a support column 1-6, a base 1-7 and a positioning pointer 1-8, wherein the image acquisition assembly is arranged on the base;
2. the method comprises the following steps of (1) measuring a platform, 2-1. a slide rail, 2-2. a positioning groove, 2-3. a positioning scale and 2-4. a positioning pin;
3. a flat plate heat sink.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.
As introduced by the background art, the defects of low measurement precision and small measurement range exist in the prior art, and in order to solve the technical problems, the invention provides a device and a method for visually detecting the installation size of a threaded hole of a radiator.
The first embodiment is as follows:
the present invention is described in detail below with reference to fig. 1 to 3, and specifically, the structure is as follows:
the embodiment provides a visual detection device for the installation size of a threaded hole of a radiator, which comprises a measuring platform 2 and a plurality of image acquisition assemblies 1, wherein the image acquisition assemblies 1 are connected with the measuring platform 2 in a sliding manner. When the device is used, the flat plate type radiator 3 is placed above the measuring platform 2, and the image acquisition assembly 1 is used for acquiring images of assembly threaded holes distributed in the flat plate type radiator 3.
In order to correspond to the number of threaded holes of the flat plate type heat sink 3, four image acquisition assemblies 1 are arranged in the embodiment and are symmetrically arranged relative to the measuring platform 2. As shown in fig. 2, the image capturing assembly 1 includes an industrial camera 1-1, an annular light source 1-3, a first cantilever 1-4, a second cantilever 1-5, a support column 1-6, and a base 1-7, wherein the base 1-7 is fixed to the bottom of the support column 1-6. One side of the base 1-7 is provided with a positioning pointer 1-8 which can indicate the relative position of the industrial camera 1-1 projected on the plane of the base 1-7 in the vertical direction.
The industrial camera 1-1 is arranged at the end part of the first cantilever 1-4, the annular light source 1-3 is arranged at the end part of the second cantilever 1-5, and the first cantilever 1-4 and the second cantilever 1-5 are respectively connected with the supporting column 1-6 in a sliding manner. Furthermore, the first cantilever 1-4 is connected with the support column 1-6 through a first guide block, the first cantilever 1-4 horizontally penetrates through the first guide block, and the distance for inserting the first cantilever 1-4 into the first guide block is adjustable. The support column 1-6 vertically penetrates through the first guide block, and the first guide block can be adjusted up and down along the support column 1-6, so that the height of the industrial camera 1-1 can be adjusted.
The annular light source 1-3 is arranged below the industrial camera 1-1, the lens 1-2 of the industrial camera 1-1 corresponds to the central position of the annular light source 1-3, and the industrial camera 1-1 can acquire an image of the lower area under the illumination condition of the annular light source 1-3. The second suspension arm 1-5 is connected with the support column 1-6 through a second guide block, and the specific connection structure is the same as that of the first suspension arm 1-4, which is not described herein again.
In this embodiment, specific structures of the first guide block and the second guide block are not limited as long as the first suspension arm 1-4 and the second suspension arm 1-5 can be satisfactorily supported. The first guide block and the second guide block are respectively provided with a horizontal through hole and a vertical through hole.
As shown in fig. 3, the measuring platform 2 includes a platform main body and a supporting seat installed at the bottom of the platform main body, and the specific structure and shape of the supporting seat are not limited as long as the supporting function can be achieved. In this embodiment, the support base comprises four support legs, one support leg being mounted at each corner of the platform body. The platform body is used for matching the image acquisition assembly 1. In this embodiment, the platform main body has a rectangular plate structure.
The sliding rails 2-1 are symmetrically arranged along the length direction of the platform main body, and the base 1-7 of the image acquisition assembly 1 is in sliding connection with the sliding rails 2-1 so as to adjust the position of an image acquisition area. A positioning scale 2-3 is arranged on one side of the sliding rail 2-1, and scale values are arranged on the positioning scale 2-3 and can be matched with positioning pointers 1-8 to determine the relative position of the image acquisition assembly 1 in the horizontal direction of the measuring platform 2.
A plurality of positioning grooves 2-2 are arranged between the two sliding rails 2-1, and the positioning grooves 2-2 are symmetrically arranged along the length direction and the width direction of the measuring platform 2. In the present embodiment, the positioning groove 2-2 is a long strip. The positioning groove 2-2 can be inserted with a positioning pin 2-4 capable of sliding along the positioning groove, and the cylindrical surface of the positioning pin 2-4 is contacted with the side edge of the flat plate type radiator 3 placed on the platform main body, so that the relative position of the flat plate type radiator 3 during measurement is ensured.
Example two:
in this embodiment, the detecting device described in the first embodiment is adopted, and the steps of measuring the space and the diagonal length of 4 threaded holes distributed on four corners of the flat plate type heat sink 3 are as follows:
(1) the plate type radiator 3 to be measured is placed on the plane of the measuring platform 2, and the relative position of the plate type radiator 3 in the horizontal direction is ensured to be proper by adjusting the position of the positioning pin 2-4 in the positioning groove 2-2. And adjusting the 4 groups of image acquisition assemblies 1 to proper positions, and adjusting the positions of the industrial camera 1-1 and the annular light source 1-3 to enable the industrial camera and the annular light source to carry out image acquisition operation on the threaded holes of the plate type heat radiator 3 to be measured below.
(2) The calibration operation for the first measurement is performed, and as shown in fig. 4, the present embodiment calibrates 4 groups of industrial cameras 1-1 by using a calibration board composed of 4 5 × 7 color patches.
The calibration plate is placed on the plane of the measuring platform 2, just below the 4 sets of industrial cameras 1-1 respectively. Adopting Zhangyingyou calibration method to make 4 times of independent calibration, because 4 calibration plates are positioned on same plane, can ignore height, respectively establishing plane rectangular coordinate system X1O1Y1、X2O2Y2、X3O3Y3、X4O4Y4。
The origin, the positive directions of the X axis and the Y axis of the four coordinate systems (the positive direction toward the side of the adjacent calibration plate) are shown in FIG. 4, and then 4 coordinate systems are unified to X coordinate system by coordinate system conversion1O1Y1And the origin of the coordinate system is on the world coordinate system XOY with the positive directions of the X axis and the Y axis, so that the subsequent measurement and calculation are facilitated.
X1O1Y1After transformation of the coordinate system, the results are as follows:
x＝x1k1
y＝y1k1(1)
wherein' k1Is a coordinate system X1O1Y1A scaling factor.
X2O2Y2After transformation of the coordinate system, the results are as follows:
x＝(W-x2)·k2
y＝y2k2(2)
wherein' k2Is a coordinate system X2O2Y2Scaling factor, 'W' is the coordinate system X1O1Y1And the coordinate system X2O2Y2The distance of the origin.
X3O3Y3After transformation of the coordinate system, the results are as follows:
x＝(W-x3)·k3
y＝(L-y3)·k3(3)
wherein' k3Is a coordinate system X2O2Y2Scaling factor, 'L' is the coordinate system X2O2Y2And the coordinate system X3O3Y3The distance of the origin.
X4O4Y4After transformation of the coordinate system, the results are as follows:
x＝x4k4
y＝(L-y4)·k4(4)
wherein' k4Is a coordinate system X4O4Y4A scaling factor.
(3) And after calibration is finished, image acquisition is started, and acquired image data is subjected to preprocessing operation and is converted into an RGB image, and then the white balance of the image is adjusted. Then, the image is grayed by an average value method.
Wherein, 'Gray' is an image Gray value; 'R' is the image red component; 'G' is the image green component; 'B' is the image blue component.
(4) And then the grayed image is subjected to binarization processing by an integral image method. According to the method, the threshold value is selected according to the local gray level characteristics of the image to carry out binarization operation, so that the influence of illumination on image identification can be reduced.
(5) And after the binary image is obtained, performing hole filling operation on the binary image to eliminate the noise influence in the image. And traversing the processed image, detecting edges by using a Canny algorithm, searching contours and numbering one by one. The outline of the threaded hole to be measured is determined through the area, and then the moment of the outline is calculated, so that the centroid coordinate of the outline, namely the pixel coordinate of the center of the threaded hole, is obtained. And converting the pixel coordinates of the center of the threaded hole into an XOY coordinate system through coordinate transformation.
(6) Acquiring images of the flat plate type radiator 3 for 3 times, and calculating coordinates under a central world coordinate system of 3 groups of 4 threaded holes as follows: p1i(x1i,y1i)、P2i(x2i,y2i)、P3i(x3i,y3i)、P4i(x4i,y4i) Wherein i is 1,2, 3. Then the pitch of the threaded holes and the length of the diagonal are calculated.
Two short side intervals of screw hole:
two long limit intervals of screw hole:
two diagonal lengths of the threaded hole:
(7) and (4) repeating the steps (3) to (6) to measure the distance between the threaded holes of the radiator and the length of the diagonal line.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a radiator screw hole installation size visual inspection device which characterized in that includes:
the measuring platform is used for placing a radiator, and positioning rulers are symmetrically arranged on the surface of the measuring platform;
the image acquisition assemblies are connected with the measuring platform in a sliding manner and are used for acquiring images of threaded holes of the radiator; the image acquisition assembly comprises a supporting column, the supporting column is connected with the industrial camera and the annular light source in a sliding mode, the industrial camera is located above the annular light source, and the industrial camera can acquire images of the lower area under the irradiation condition of the annular light source.
2. The visual inspection device for the installation size of the threaded hole of the radiator as claimed in claim 1, wherein one end of the supporting column is connected with a base which is slidably connected with the measuring platform, and one side of the base, which corresponds to the positioning scale, is provided with a positioning pointer.
3. The visual inspection device for the installation size of the threaded hole of the heat sink as claimed in claim 1, wherein the industrial camera is installed at the first cantilever end part, and the annular light source is installed at the second cantilever end part; the first cantilever and the second cantilever are respectively connected with the supporting column in a sliding manner.
4. The visual inspection device for the installation size of the threaded hole of the heat sink as claimed in claim 3, wherein the first cantilever is connected with the supporting column through a first guide block, and the distance of the first cantilever inserted into the first guide block is adjustable; the second cantilever is connected with the supporting column through the second guide block, and the distance of the second cantilever inserted into the second guide block is adjustable.
5. The visual inspection device for the installation size of the threaded hole of the heat sink as claimed in claim 1, wherein the surface of the measuring platform is symmetrically provided with slide rails along the length direction.
6. The visual inspection device for the installation size of the threaded hole of the heat sink as claimed in claim 5, wherein a plurality of positioning grooves are formed between the slide rails and distributed along the transverse direction and the longitudinal direction.
7. The visual inspection device for the installation size of the threaded hole of the heat sink as claimed in claim 6, wherein a positioning pin is inserted into the positioning slot.
8. A visual inspection method for the installation size of a threaded hole of a radiator, which is characterized by adopting the inspection device as claimed in any one of claims 1 to 7, and comprises the following steps:
(1) calibrating and transforming the coordinates of an industrial camera in the image acquisition assembly, and unifying the industrial camera in a world coordinate system;
(2) adjusting the position of the positioning pin in the positioning groove to position the relative position of the radiator in the horizontal direction;
(3) the image acquisition assembly acquires an image of the radiator to be measured, and the image is processed to obtain the distance between threaded holes of the radiator and the length of an oblique diagonal line;
(4) and (4) repeating the steps (1) to (3) to finish the visual measurement of the installation size of the threaded hole of the radiator.
9. The visual inspection method for the installation size of the threaded hole of the radiator as claimed in claim 8, wherein in the step (3), the collected image is subjected to preprocessing, graying processing and binarization processing; and then, carrying out hole filling operation on the image, carrying out edge detection on the image after hole filling, searching the outline, and calculating the pixel coordinate of the threaded hole of the radiator by calculating the outline moment.
10. The visual inspection method for the installation size of the threaded hole of the heat radiator as claimed in claim 9, wherein after pixel coordinates are obtained, the pixel coordinates are converted into world coordinate system coordinates according to calibration; and calculating the distance between the threaded holes of the radiator and the length of the diagonal line through coordinates under a world coordinate system.
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| CN202010064391.9A CN111220077B (en) | 2020-01-20 | 2020-01-20 | Visual detection device and method for installation size of threaded hole of radiator |
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| CN202010064391.9A CN111220077B (en) | 2020-01-20 | 2020-01-20 | Visual detection device and method for installation size of threaded hole of radiator |
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