A cylinder density meter based on machine vision

Abstract

This application relates to the technical field of detection equipment, and in particular to a cylinder density meter based on machine vision, which includes an installation platform, an installation frame arranged on the installation platform, a mass measurement device arranged on the installation platform for measuring the mass of a workpiece, a backlight source arranged on the installation frame and projecting the workpiece, and a camera lens arranged on the installation frame for collecting the image of the workpiece; a support frame for supporting the workpiece is arranged on the mass measurement device, and the workpiece is located between the backlight source and the camera lens; an adjustment device for adjusting the angle and position of the camera lens is also arranged on the installation frame. This application has the effect of being able to automatically weigh the workpiece and obtain the external dimensions of the workpiece simultaneously, so as to improve the measurement speed and the accuracy of the measurement results.

Description

Technical Field

[0001] This application relates to the technical field of detection equipment, and in particular, to a cylinder densitometer based on machine vision. Background Art

[0002] Density is one of the characteristics of workpieces. Different workpieces have different densities. Therefore, we can use density to identify workpieces. Since density is equal to the mass of the workpiece divided by the volume, when we measure the mass and volume of the workpiece, we can calculate the density of the workpiece. The mass of the workpiece can be directly weighed by a mass measuring device. Therefore, the most crucial thing is how to accurately measure the volume of the workpiece.

[0003] In the related art, there are usually two methods for measuring the volume of workpieces. One is manual measurement using a caliper by hand. This measurement method has a large error. In order to reduce the error, multiple measurements are required, and the overall measurement speed is slow. The other is the drainage method, that is, filling a container with water, completely immersing the workpiece in the water, collecting the drained water and weighing its mass, and using the known density of water to calculate the volume. However, this measurement method has a complex process and a slow measurement speed.

[0004] With the development of technology, machine vision has become a rapidly developing new technology for industrial automation. A typical industrial vision detection system consists of a light source, an optical imaging system (image sensor), an image acquisition link (image acquisition card), an image processing link, and an image understanding and recognition link.

[0005] The camera takes pictures of industrial parts, and then the image data is input into a computer through an image data acquisition card for image processing to obtain the external dimensions of the workpiece.

[0006]

[0007] For example: There is a method and device for measuring the size of a workpiece based on machine vision. The usage method of the device is as follows: Collect the original image of the workpiece to be measured; select a median filter template to filter the original image of the workpiece; perform image segmentation on the filtered image based on the OTSU algorithm; perform edge detection on the segmented image to obtain the edges of the workpiece for measurement, and calculate the pixel distance between the edges of the image of the workpiece to be measured; obtain the calibration coefficient, and calculate the actual physical size of the workpiece to be detected according to the pixel distance between the edges and the calibration coefficient. The device includes an acquisition module, a denoising module, a segmentation module, an edge detection module, and a calculation module. This method and device can meet the detection accuracy and speed requirements during workpiece measurement, have higher robustness to environmental changes, and realize real-time and non-contact workpiece size detection based on machine vision.

[0007] Existing measurement methods cannot simultaneously obtain the quality and volume of a workpiece. It is necessary to measure the quality and volume of the workpiece separately to obtain the initial data, and then calculate the density of the workpiece. The measurement process is relatively cumbersome, time-consuming and laborious. Summary of the Invention

[0008] In order to be able to automatically weigh a workpiece and obtain the external dimensions of the workpiece simultaneously, so as to improve the measurement speed and the accuracy of the measurement results, the present application provides a cylindrical density meter based on machine vision.

[0009] The cylindrical density meter based on machine vision provided by the present application adopts the following technical solutions:

[0010] A cylindrical density meter based on machine vision includes an installation platform, a mounting frame arranged on the installation platform, a mass measurement device arranged on the installation platform for measuring the mass of a workpiece, a backlight source arranged on the mounting frame and projecting the workpiece, and a camera lens arranged on the mounting frame for collecting an image of the workpiece; a support frame for supporting the workpiece is arranged on the mass measurement device, and the workpiece is located between the backlight source and the camera lens; an adjustment device for adjusting the angle and position of the camera lens is further arranged on the mounting frame.

[0011] By adopting the above technical solutions, the workpiece is placed on the support frame, the angle and position of the camera lens are adjusted according to the shape and size of the workpiece, the mass measurement device, the backlight source and the camera lens are turned on. The mass measurement device weighs the mass of the workpiece, the backlight source can perform backlight projection on the workpiece, and the camera lens can clearly capture the external image of the workpiece and take a picture of the workpiece with the assistance of the backlight source. The obtained data and images are transmitted to a computer, and the volume is automatically calculated through processing, and then the density of the workpiece is obtained. This cylindrical density meter can simultaneously automatically weigh the workpiece and obtain the external dimensions of the workpiece, and automatically obtain the density of the workpiece. The measurement speed is fast and the relative error of the measurement result is small, which improves the accuracy of the obtained density of the workpiece. There is no need for manual weighing and volume calculation respectively, which saves time and effort.

[0012] Optionally, two camera lenses are provided, and the included angle between the axes of the two camera lenses is 90 degrees.

[0013] By adopting the above technical solutions, the included angle between the axes of the camera lenses on the optical measurement device is 90 degrees, so that two sets of diameters and lengths perpendicular to each other of the workpiece can be obtained simultaneously, and more accurate external dimensions of the workpiece can be obtained.

[0014] Optionally, the adjustment device includes an angle adjustment component for adjusting the angle of the camera lens.

[0015] By adopting the above technical solution, the angle of the camera lens can be adjusted according to the different shapes and sizes of the workpieces, so as to obtain the most accurate appearance image of the workpieces.

[0016] Optionally, the angle adjustment assembly includes a frustum fixed on the mounting bracket, a rotating plate is rotatably connected to the frustum, a U-shaped plate is formed on one side of the rotating plate, a limiting rod is inserted through the U-shaped plate, a ejector rod is inserted through the rotating plate, and a clamping groove for the ejector rod to insert is formed on the limiting rod.

[0017] By adopting the above technical solution, rotate the rotating plate to adjust the camera lens to a suitable position, and screw the ejector rod so that the ejector rod is stuck in the groove formed on the limiting rod to fix the rotating plate.

[0018] Optionally, the adjusting device further includes a horizontal adjustment assembly for adjusting the horizontal position of the camera lens.

[0019] By adopting the above technical solution, the horizontal position of the camera lens can be adjusted according to the different shapes and sizes of the workpieces, so as to obtain the most accurate appearance image of the workpieces.

[0020] Optionally, the horizontal adjustment assembly includes a third connecting plate fixed on the rotating plate, a sliding plate is slidably connected to the third connecting plate, a limiting plate is arranged on the third connecting plate, a sliding groove is formed on the limiting plate, a limiting member is arranged on the sliding plate, and the limiting member can slide in the sliding groove.

[0021] By adopting the above technical solution, the limiting member slides in the sliding groove to drive the sliding plate to slide, and then drives the camera lens to move. When the camera lens is adjusted to a suitable position, screw the limiting member to fix the sliding plate.

[0022] Optionally, the support frame includes a material support, the material support is a double-inserted arm structure, and there is a gap between the two double-inserted arms.

[0023] By adopting the above technical solution, the double-inserted arm structure of the material support can ensure that the light of the backlight irradiates the entire workpiece, so that the camera lens can obtain an accurate image of the workpiece.

[0024] Optionally, the cylinder density meter based on machine vision further includes a tray positioning assembly for supporting the support frame. The tray positioning assembly includes a sliding table frame and a top plate for supporting the support frame, and a second driving assembly for driving the top plate to move horizontally is arranged on the sliding table frame.

[0025] By adopting the above technical solution, the tray positioning assembly can prevent the material support from tipping over to ensure the stability of the workpiece fixation.

[0026] Optionally, the machine vision-based cylinder density meter further includes a positioning and anti-drop device for supporting the workpiece. The positioning and anti-drop device includes a mounting frame and a push rod for supporting the workpiece. A first driving assembly for driving the push rod to move horizontally is arranged on the mounting frame.

[0027] By adopting the above technical solution, the positioning and anti-drop device can support the workpiece and prevent the workpiece on the material tray from falling.

[0028] Optionally, the positioning and anti-drop device further includes a lifting platform for driving the first driving assembly and the push rod to move vertically.

[0029] By adopting the above technical solution, the lifting platform can adjust the height of the push rod, so as to adjust the position of the push rod according to the size of different workpieces to achieve stable support.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The present application is provided with an optical measurement device and a mass measurement device. The optical measurement device includes two camera lenses and two backlights. The included angle between the axes of the camera lenses on the optical measurement device is 90 degrees, so that two sets of diameters and lengths perpendicular to each other of the workpiece can be obtained simultaneously, and more accurate external dimensions of the workpiece can be obtained. At the same time, the mass measurement device can measure the mass of the workpiece, and then transmit the obtained workpiece image and mass data to a computer for subsequent processing to obtain the density of the workpiece. In this way, the workpiece can be automatically weighed, its volume can be measured, and its density can be calculated. The measurement speed is fast and the relative error of the measurement result is small, improving the accuracy of the obtained workpiece density;

[0032] 2. The present application is provided with an angle adjustment component and a horizontal adjustment component, so that the horizontal position and the angle of the camera lens can be adjusted according to the differences of each workpiece, so that the camera lens can capture the image with the highest precision and obtain the most accurate external dimensions;

[0033] 3. The present application is provided with a positioning and anti-drop device and a tray positioning device. The positioning and anti-drop device can support the workpiece and prevent the workpiece on the material tray from falling, and the tray positioning device can prevent the material tray from tipping over to ensure the stability of the fixed workpiece. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the machine vision-based cylinder density meter in the embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of the base in the embodiment of the present application;

[0036] Figure 3 is the front view of the cylinder density meter based on machine vision in the embodiment of the present application;

[0037] Figure 4 is Figure 3 the enlarged view of part A in

[0038] Figure 5 is the exploded view of the angle adjustment component in the embodiment of the present application;

[0039] Figure 6 is the structural schematic diagram of the support frame in the embodiment of the present application;

[0040] Figure 7 is the structural schematic diagram of the positioning and anti-drop device in the embodiment of the present application;

[0041] Figure 8 is the structural schematic diagram of the tray positioning device in the embodiment of the present application.

[0042] Explanation of reference numerals: 1, installation platform; 2, mounting frame; 201, base; 2011, light source bracket; 2012, first notch; 2013, second notch; 2014, ear plate; 202, lens bracket; 2021, first connecting plate; 2022, connecting block; 2023, lens seat; 203, adjustment table board; 2031, first side plate; 2032, second side plate; 3, mass measurement device; 4, camera lens; 5, backlight; 6, workpiece; 7, fixing plate; 8, support frame; 801, tray; 802, vertical plate; 803, support block; 804, material support; 8041, material support seat; 8042, trapezoidal block; 8043, material support body; 9, adjustment device; 901, angle adjustment component; 9011, second connecting plate; 9012, frustum; 9013, rotating plate; 9014, U-shaped plate; 9015, limiting rod; 9016, ejector rod; 902, horizontal adjustment component; 9021, third connecting plate; 9022, sliding plate; 9023, sliding groove; 9024, limiting part; 9025, limiting plate; 10, cushion block; 11, protective circle; 12, mounting frame; 13, positioning and anti-drop device; 1301, push rod; 1302, first driving component; 13021, first lead screw motor; 13022, first slider; 1303, lifting platform; 1304, first slide rail seat; 1305, slide rail; 1306, first mounting plate; 1307, second mounting plate; 14, tray positioning device; 1401, top plate; 1402, second driving component; 14021, second lead screw motor; 14022, second slider; 1403, second slide rail seat; 1404, second slide rail; 1405, first baffle; 1406, second baffle; 15, slide table frame. Detailed implementation manners

[0043] The following is combined with the attachedFigure 1-8 Further detailed description of the present application is provided below.

[0044] This cylindrical density meter can automatically measure the volume, mass, and density of cylindrical workpieces. At the same time, this cylindrical density meter also has functions such as automatic configuration of common cylindrical core block parameters, output of conventional statistical items, various working condition prompts and alarms, etc. These functions are all realized through an externally connected computer system. In this embodiment, only the volume and mass measurement device in this cylindrical density meter will be described.

[0045] This embodiment of the present application discloses a cylindrical density meter based on machine vision. Refer to Figure 1 , the cylindrical density meter based on machine vision includes an installation platform 1 for installing this cylindrical density meter. An installation frame 2 is provided on the installation platform 1, a mass measurement device 3 for measuring the mass of the workpiece 6, and a support frame 8 for supporting the workpiece 6 provided on the mass measurement device 3. An installation chamber is formed between the installation frame 2 and the installation platform 1. A backlight 5 for projecting the workpiece 6 and a camera lens 4 for acquiring the image of the workpiece 6 are provided on the installation frame 2. The mass measurement device 3 is arranged in the installation chamber, and the workpiece 6 is located between the camera lens 4 and the backlight 5.

[0046] The mass measurement device 3 can measure the mass of the workpiece 6. The backlight 5 can provide high-intensity backlight projection, so that the camera lens 4 can only capture the appearance image of the workpiece 6 under the projection of the backlight 5. The collected image will be transmitted to the computer for image processing to obtain the appearance size of the workpiece 6. At the same time, the obtained mass of the workpiece 6 is also transmitted to the computer. Finally, the density of the workpiece 6 can be automatically obtained through computer software. In this way, the workpiece 6 can be automatically weighed, its volume measured, and its density calculated simultaneously. The measurement speed is fast, time and labor are saved, and the relative error of the measurement result is small, improving the accuracy of the obtained density of the workpiece 6.

[0047] Specifically, the camera lens 4 can adopt an industrial lens. There are various types of industrial lenses, which can be selected according to actual usage requirements. In this embodiment, no specific limitation is made on the specific type of the camera lens 4. The mass measurement device 3 can adopt an electronic balance, an electronic scale, etc. In this embodiment, no specific limitation is made on the specific type of the mass measurement device 3. In order to fix the mass measurement device 3, a fixing plate 7 is provided on each of the four sides of the mass measurement device 3. The fixing plate 7 is L-shaped. One side plate of the fixing plate 7 is fixedly connected to the mass measurement device 3, and the other side plate of the fixing plate 7 is fixedly connected to the installation platform 1. The fixing method here can adopt welding, bolt connection, etc. In this embodiment, no specific limitation is made on the fixing method here.

[0048] Refer to Figure 2 and Figure 3, the mounting bracket 2 includes a base 201 for mounting the backlight 5. The base 201 includes a light source holder 2011. The cross-section of the light source holder 2011 is trapezoidal. A first notch 2012 is formed at the top of the light source holder 2011. The opening direction of the first notch 2012 is upward, and the shape of the first notch 2012 is trapezoidal. A second notch 2013 is formed at the bottom of the light source holder 2011. The opening direction of the second notch 2013 is downward, and the shape of the second notch 2013 is trapezoidal. In this application, two backlights 5 are provided. Two through holes for the backlights 5 to be embedded are formed on the light source holder 2011. The two backlights 5 are arranged obliquely and mirror-symmetrically, and the extension lines of the axes of the two backlights 5 intersect above the light source holder 2011. Lugs 2014 are formed on each of the two inclined sides of the light source holder 2011, and the bottom surface of the lug 2014 is flush with the bottom surface of the light source holder 2011.

[0049] To facilitate the installation of the quality measurement device 3 and the backlight 5, two pads 10 are provided on the installation platform 1. The upper ends of the two pads 10 are respectively fixedly connected to the two lugs 2014. The fixing method can be welding, bolt connection, screw connection, etc. In this embodiment, the specific fixing method is not specifically limited. An arch-shaped opening is formed on the pad 10 to facilitate the installation of the backlight 5. Fixing blocks are formed on both sides of the pad 10, and the fixing blocks can be fixed to the installation platform 1 by bolts or screws. Of course, the pad 10 can also be directly welded and fixed to the installation platform 1. In this embodiment, only the fixing by bolts or screws is taken as an example for illustration.

[0050] Refer to Figure 1 and Figure 3 , two camera lenses 4 are provided. A lens holder 202 is connected to each of the two inclined sides of the base 201. The lens holder 202 includes a first connecting plate 2021. A connecting block 2022 perpendicular to the connecting plate is fixedly connected to the first connecting plate 2021. A square lens seat 2023 is formed on the connecting block 2022. A through hole for the camera lens 4 to be embedded is formed on the lens seat 2023. The extension lines of the axes of the two camera lenses 4 intersect below the camera lens 4. In this embodiment, the included angle between the axes of the two camera lenses 4 is 90 degrees, so that two sets of diameters and lengths perpendicular to each other of the workpiece can be obtained simultaneously, and more accurate external dimensions of the workpiece can be obtained.

[0051] Refer to Figure 3, due to the differences in the external dimensions of the workpiece 6, it is necessary to adjust the position of the camera lens 4 to ensure obtaining an accurate appearance image of the workpiece 6. To facilitate the adjustment of the position and angle of the camera lens 4, an adjustment device 9 is provided on the mounting bracket 2. On the side surfaces of the two inclined sides of the base 201, an adjustment table plate 203 is fixedly connected respectively. The adjustment table plate 203 includes a first side plate 2031 and a second side plate 2032 perpendicular to the first side plate 2031. The first side plate 2031 is fixedly connected to the inclined side surface of the base 201, and the opening direction of the adjustment table plate 203 faces downward. The adjustment device 9 includes an angle adjustment component 901 provided on the base 201 for adjusting the angle between the camera lens 4 and the horizontal plane, and a horizontal adjustment component 902 provided on the horizontal adjustment component 902 for adjusting the horizontal position of the camera lens 4. The lens holder 2023 is indirectly fixed to the adjustment table plate 203 through the horizontal adjustment component 902 and the angle adjustment component 901.

[0052] Specifically, referring to Figure 4 and Figure 5 , the angle adjustment component 901 includes a second connecting plate 9011 fixedly connected to the second side plate 2032. A frustum 9012 is fixedly connected to the second connecting plate 9011. A rotating plate 9013 is rotatably connected to the frustum 9012. A U-shaped plate 9014 is fixedly connected to the rotating plate 9013. A chamber is formed between the U-shaped plate 9014 and the rotating plate 9013. A limiting rod 9015 is inserted through the U-shaped plate 9014, and the axis of the limiting rod 9015 is parallel to the setting direction of the second side plate 2032. A top rod 9016 is screwed on the rotating plate 9013. The top rod 9016 penetrates into the rotating plate 9013 from the opposite side of the U-shaped plate 9014 and extends into the above chamber. A card slot for the top rod 9016 to be inserted into is provided on the limiting rod 9015. Rotate the rotating plate 9013 to adjust the camera lens 4 to a suitable position, and then screw the top rod 9016 to make the top rod 9016 snap into the slot provided on the limiting rod 9015 to fix the rotating plate 9013.

[0053] The horizontal adjustment component 902 includes a third connecting plate 9021 fixedly connected to the rotating plate 9013. A sliding plate 9022 is slidably connected to the third connecting plate 9021. The first connecting plate 2021 is fixedly connected to the sliding plate 9022. A limiting plate 9025 is fixedly connected to the third connecting plate 9021. A sliding groove 9023 is provided on the limiting plate 9025. A limiting member 9024 is screwed on the sliding plate 9022. The limiting member 9024 can slide in the sliding groove 9023. The limiting member 9024 can be a set screw, a bolt, a screw, etc. In this embodiment, only the set screw is taken as an example for illustration. The limiting member 9024 slides in the sliding groove 9023 to drive the sliding plate 9022 to slide, and then drive the camera lens 4 to move. When the camera lens 4 is adjusted to a suitable position, screw the limiting member 9024 to fix the sliding plate 9022.

[0054] Reference Figure 3 and reference Figure 6 Figure 6 , the support frame 8 includes a tray 801 rotatably connected to the mass measuring device 3. A vertical plate 802 is fixedly connected to the tray 801. A through hole is formed in the base 201 for the vertical plate 802 to pass through. A support block 803 is fixedly connected to the side of the vertical plate 802. The support block 803 is located in the through hole of the base 201 and abuts against the inner wall of the through hole. A material support 804 is provided at one end of the vertical plate 802 away from the tray 801. The material support 804 is composed of a material support 804 seat, a trapezoidal block 8042, and a material support 804 body. The material support 804 seat is square. A groove for the vertical plate 802 to be embedded is formed on one side of the material support 804 seat close to the vertical plate 802. The trapezoidal block 8042 is formed on the top of the material support 804 seat. The material support 804 body is formed on the top of the trapezoidal block 8042. One end of the material support 804 body away from the trapezoidal block 8042 is formed into an arc surface to prevent the cylindrical workpiece 6 from rolling. The material support 804 body is a double-inserted arm structure, and there is a gap between the two double-inserted arms. In this way, the light generated by the backlight 5 can completely irradiate the workpiece 6, so as to improve the accuracy of the image of the workpiece 6 obtained by the camera lens 4.

[0055] A protective ring 11 is provided on one side of the base 201 close to the workpiece 6. The vertical plate 802 passes through the protective ring 11. By providing the protective ring 11, the through hole on the base 201 can be blocked to play a protective role.

[0056] Reference Figure 3 and Figure 7 Figure 7 , in order to prevent the workpiece 6 from falling off the material support 804, the cylindrical density meter is further provided with a positioning and anti-falling device 13. The positioning and anti-falling device 13 includes a mounting frame 12 fixed on the mounting platform 1, a push rod 1301 for supporting the workpiece 6, and a lifting platform 1303 provided on the mounting frame 12. A first driving component 1302 for driving the push rod 1301 to move horizontally is provided on the lifting platform 1303.

[0057] Specifically, the lifting platform 1303 can use an electric push rod 1301, an electric cylinder, a scissor lift, etc. as the power source to drive the first driving component 1302 and the push rod 1301 to move vertically. In this embodiment, the power source of the lifting platform 1303 is not specifically limited.

[0058] At the top of the lifting table 1303, a first slide rail seat 1304 is fixedly connected. A first slide rail 1305 is fixedly connected to the first slide rail seat 1304. At both ends of the first slide rail 1305, a first mounting plate 1306 and a second mounting plate 1307 are fixedly connected respectively. The first mounting plate 1306 is located at one end of the first slide rail 1305 close to the workpiece 6, and the second mounting plate 1307 is located at one end of the first slide rail 1305 away from the workpiece 6. The first driving assembly 1302 includes a first lead screw motor 13021 fixed on the second mounting plate 1307. One end of the output shaft of the first lead screw motor 13021 away from the first lead screw motor 13021 is rotationally connected to the first mounting plate 1306 through a bearing. A first slider 13022 is threadedly connected to the output shaft of the first lead screw motor 13021. The push rod 1301 is fixedly connected to the first slider 13022. At the same time, the first slider 13022 is slidably connected to the first slide rail 1305.

[0059] Start the first lead screw motor 13021. The output shaft of the first lead screw motor 13021 drives the first slider 13022 to move along the direction of the first guide rail, driving the push rod 1301 to move until it abuts against the workpiece 6, so as to realize the support of the workpiece 6.

[0060] Refer to Figure 3 and Figure 8 In order to further improve the stability of the workpiece 6, the cylindrical density meter is also provided with a pallet 801 positioning device. The pallet 801 positioning device includes a slide table frame 15 fixedly connected to the installation platform 1 and a top plate 1401 for supporting the vertical plate 802. A second driving assembly 1402 for driving the top plate 1401 to move is arranged on the slide table frame 15. A second slide rail seat 1403 is fixedly connected to the slide table frame 15. A second slide rail 1404 is fixedly connected to the second slide rail seat 1403. At both ends of the second slide rail 1404, a first baffle 1405 and a second baffle 1406 are fixedly connected respectively. The first baffle 1405 is located at one end of the second slide rail 1404 close to the workpiece 6, and the second baffle 1406 is located at one end of the second slide rail 1404 away from the workpiece 6. A second lead screw motor 14021 is fixed on the second baffle 1406. One end of the output shaft of the second lead screw motor 14021 away from the second lead screw motor 14021 is rotationally connected to the first baffle 1405 through a bearing. A second slider 14022 is threadedly connected to the output shaft of the second lead screw motor 14021. The top plate 1401 is fixedly connected to the second slider 14022. At the same time, the second slider 14022 is slidably connected to the second slide rail 1404.

[0061] Start the second lead screw motor 14021. The output shaft of the second lead screw motor 14021 drives the second slider 14022 to move along the direction of the second guide rail, driving the top plate 1401 to move until it abuts against the vertical plate 802. At the same time, with the auxiliary effect of the support block 803, the support of the vertical plate 802 is realized to prevent the vertical plate 802 from tipping over.

[0062] The implementation principle of a cylinder density meter based on machine vision in an embodiment of this application is as follows: First, start the second lead screw motor 14021. The second lead screw motor 14021 drives the top plate 1401 to move until it abuts against the vertical plate 802 to support the vertical plate 802. Then, place the workpiece 6 on the material support 804. Start the first lead screw motor 13021. The first lead screw motor 13021 drives the push rod 1301 to move until it abuts against the workpiece 6 to support the workpiece 6. Adjust the angle adjustment assembly 901 and the horizontal adjustment assembly 902 so that the camera lens 4 can obtain the most accurate appearance image of the workpiece 6. Turn on the quality measurement device 3, and the computer automatically calculates the volume of the workpiece 6, and then obtains the density of the workpiece 6. This cylinder density meter can automatically weigh and measure the volume of the workpiece 6 at the same time and calculate the density. The measurement speed is fast and the relative error of the measurement result is small, improving the accuracy of the density of the obtained workpiece 6, saving time and effort.

[0063] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A cylinder density meter based on machine vision, characterized in that: It includes an installation platform (1), a mounting frame (2) arranged on the installation platform (1), a mass measurement device (3) arranged on the installation platform (1) for measuring the mass of a workpiece (6), a backlight (5) arranged on the mounting frame (2) and projecting onto the workpiece (6), and a camera lens (4) arranged on the mounting frame (2) for collecting an image of the workpiece (6); A support frame (8) for supporting the workpiece (6) is arranged on the mass measurement device (3), and the workpiece (6) is located between the backlight (5) and the camera lens (4); [[ID= ​ ​ 2. The cylinder density meter based on machine vision according to claim 1, wherein: ​ 3. The cylinder densitometer based on machine vision according to claim 2, characterized in that: ​ 4. The cylinder density meter based on machine vision according to claim 3, characterized in that: ​ 5. The cylinder density meter based on machine vision according to claim 4, wherein: ​ 6. The cylinder density meter based on machine vision according to claim 1, characterized in that: ​ 7. The cylinder density meter based on machine vision according to claim 6, characterized in that: The cylinder density meter based on machine vision further includes a tray positioning device (14) for supporting the support frame (8). The tray positioning device (14) is located below the support frame (8). The tray positioning device (14) includes a sliding table frame (15) and a top plate (1401) for supporting the support frame (8). A second driving component (1402) for driving the top plate (1401) to move horizontally is arranged on the sliding table frame (15).

8. The cylinder densitometer based on machine vision according to claim 1, characterized in that: The positioning and anti-falling device (13) further includes a lifting platform (1303) for driving the first driving component (1302) and the push rod (1301) to move vertically.

Images