CN212807956U - Coarse aggregate grading rapid detection device based on laser scanning technology - Google Patents
Coarse aggregate grading rapid detection device based on laser scanning technology Download PDFInfo
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Abstract
The utility model discloses a coarse aggregate grading rapid detection device based on laser scanning technology, including image acquisition module and image processing module, image acquisition module includes binocular camera, line laser lamp, conveyer belt and camera support, the camera support includes the support base, be fixed with support vertical beam on the support base, the top of support vertical beam is equipped with the support crossbeam, binocular camera is located the front end bottom of support crossbeam, the front side middle part of binocular camera sets up wired laser fixed slot, line laser lamp is fixed nested in the online laser fixed slot; the image processing module comprises a computer processor. The utility model discloses the test result is stable, the precision is high, can detect in batches, can be more comprehensive, accurate, objective, swift detection coarse aggregate particle's particle size and grading distribution, lays solid foundation for follow-up more extensive analysis and the detection of particle size, geometric form that gathers materials.
Description
Technical Field
The utility model relates to a road engineering field, concretely relates to coarse aggregate gradation quick detection device based on laser scanning technique.
Background
The mineral mixture is composed of aggregate particles with different sizes and specifications, and the rationality of the coarse aggregate grading in the mineral mixture is an important index for evaluating the construction quality of highways. The coarse aggregate generally refers to the aggregate with the particle size larger than 4.75mm, and has obvious influence on the pavement performance of the highway due to the functions of a framework and a support in concrete, and is mainly shown as the influence on the aspects of high-temperature deformation resistance, durability, strength, low-temperature cracking resistance, fatigue resistance, bending tension resistance, impact resistance and the like of the pavement. Therefore, the evaluation of the rationality of the coarse aggregate grading is an important link for determining the quality of the asphalt pavement and the cement pavement.
The traditional coarse aggregate grading detection means are mainly manual or semi-manual indirect measurement methods, the methods are time-consuming and labor-consuming, the required detection equipment is huge, the detection period is long, the detection precision is not high, the detection result is influenced by manual operation level factors, and coarse aggregate grading parameters in mineral mixture cannot be truly reflected.
With the development of digital image technology, the domestic two-dimensional research on coarse aggregate particles by using a digital image processing technology has made remarkable progress, such as the grading detection research on asphalt mixtures based on the digital image processing technology, and the like, and has made great achievements. The achievements provide basis for the research of improving the road performance of the highway in the highway field, and compared with the traditional method, the method has the advantages of high efficiency, intellectualization, good objectivity and the like, and has very high social benefit and economic benefit. The two-dimensional virtual screening is mainly to obtain a cross-sectional image of the aggregate through a camera and screen the aggregate through the area of the aggregate in the image, but the method has the limitation that the method is difficult to avoid, namely, two-dimensional information is utilized to approach three-dimensional information aggregate grading information, grading reflects the integral three-dimensional characteristics of the aggregate, the research of a two-dimensional angle cannot comprehensively reflect the three-dimensional characteristics of the aggregate, and the three-dimensional dimension blocked by a shooting angle cannot be detected, so that inconvenience is brought to the coarse aggregate grading research.
Therefore, it is necessary to invent a rapid detection device for coarse aggregate gradation based on laser scanning technology to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a coarse aggregate gradation quick detection device based on laser scanning technique carries out 3D through the mode of binocular camera + line laser assistance-localization real-time to every coarse aggregate and detects, gathers the 3D point cloud coordinate information in coarse aggregate space and realizes three-dimensional reconstruction in real time based on the parallax error principle, adopts median filtering algorithm to fall the noise to coarse aggregate granule three-dimensional image processing, and background difference method realizes the background optimization to obtain high-quality three-dimensional image; and the geometric characteristic analysis is carried out on the processed three-dimensional image, the calculation method of the volume and the particle size of the coarse aggregate particles is researched, the grading detection is finally realized, the influence of light rays is avoided, the test result is stable, the precision is high, the large-scale detection can be realized, the particle size and the grading distribution of the coarse aggregate particles can be detected more comprehensively, accurately, objectively and quickly, a solid foundation is laid for the subsequent analysis and detection of the particle size and the geometric shape of the aggregate more widely, and the defects in the technology are solved.
In order to achieve the above object, the present invention provides the following technical solutions: a coarse aggregate grading rapid detection device based on a laser scanning technology comprises an image acquisition module and an image processing module, the image acquisition module comprises a binocular camera, a line laser lamp, a conveyor belt and a camera support, the camera support comprises a support base, the bracket base is fixed on one side of the conveyor belt through a base fixing screw, a bracket vertical beam is fixed on the bracket base, the middle part of the support vertical beam is provided with a support vertical groove, the top part of the support vertical beam is provided with a support cross beam, the left side and the right side of the bracket beam are both provided with bracket transverse grooves, the binocular camera is positioned at the bottom of the front end of the bracket beam, a camera fixing plate is fixed at the top of the binocular camera through a camera fixing screw, a wired laser fixing groove is formed in the middle of the front side of the binocular camera, and the linear laser lamp is fixedly nested in the online laser fixing groove;
the image processing module comprises a computer processor, the computer processor is located on one side of the camera support and is connected with the binocular camera and the line laser lamp through data transmission lines.
Preferably, a threaded rod is fixed at the rear end of the support cross beam and is nested in the support vertical groove, and the threaded rod is in sliding connection with the support vertical groove.
Preferably, the rear end of the threaded rod penetrates through the support to be connected with a locking nut through a vertical groove, the locking nut is connected with the threaded rod through threads, and the overall diameter of the locking nut is larger than the width of the vertical groove.
Preferably, a sliding block is fixed at the top of the camera fixing plate, the sliding block is clamped in the bracket transverse groove, and the sliding block is connected with the bracket transverse groove in a sliding manner.
Preferably, the line laser lamp is provided with a power line.
Preferably, a conveyor controller is arranged on one side of the conveyor.
Preferably, the vertical beam of the support is made of a zinc steel material.
Preferably, the bracket beam is made of a zinc steel material.
In the technical scheme, the utility model provides a technological effect and advantage:
3D detection is carried out on each coarse aggregate on the conveyor belt in a binocular camera and line laser auxiliary positioning mode, 3D point cloud coordinate information of a coarse aggregate space is collected in real time based on a parallax principle, three-dimensional reconstruction is achieved, then a computer desktop independent development program is used for processing a three-dimensional image of coarse aggregate particles, noise reduction is carried out by adopting a median filtering algorithm, and background optimization is achieved by adopting a background difference method, so that a high-quality three-dimensional image is obtained; and the geometric characteristic analysis is carried out on the processed three-dimensional image, the volume of the coarse aggregate particles is calculated by adopting a differential method, the particle size calculation is carried out based on a spherical equivalent diameter algorithm, the grading detection is finally realized, the influence of light rays is avoided, the test result is stable, the precision is high, the large-scale detection can be realized, the particle size and the grading distribution of the coarse aggregate particles can be detected more comprehensively, accurately, objectively and rapidly, and a solid foundation is laid for the analysis and detection of the subsequent wider aggregate particle size and geometric form.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
Fig. 1 is a schematic view of the overall three-dimensional structure of the present invention;
fig. 2 is a schematic view of the binocular camera and the line laser of the present invention;
fig. 3 is a view of the camera stand of the present invention;
fig. 4 is a side view of a bracket beam of the present invention;
FIG. 5 is a flow chart of the detection according to the present invention;
fig. 6 is a comparison diagram of artificial screening and three-dimensional virtual screening of 5-10mm coarse aggregate of the present invention.
Description of reference numerals:
the camera comprises a computer processor 1, a data transmission line 2, a camera support 3, a binocular camera 4, a conveyor belt 5, a conveyor belt controller 6, a camera fixing screw 7, a laser lamp 8, a laser fixing groove 9, a power line 10, a camera fixing plate 11, a support vertical groove 12, a base fixing screw 13, a support vertical beam 14, a support cross beam 15, a support base 16, a support transverse groove 17, a threaded rod 18, a locking nut 19 and a sliding block 20.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
The utility model provides a coarse aggregate grading rapid detection device based on laser scanning technology as shown in figures 1-6, which comprises an image acquisition module and an image processing module, wherein the image acquisition module comprises a binocular camera 4, a line laser lamp 8, a conveyor belt 5 and a camera support 3, the camera support 3 comprises a support base 16, the support base 16 is fixed on one side of the conveyor belt 5 through a base fixing screw 13, a support vertical beam 14 is fixed on the support base 16, a support vertical groove 12 is arranged in the middle of the support vertical beam 14, a support cross beam 15 is arranged at the top of the support vertical beam 14, support cross grooves 17 are arranged on the left side and the right side of the support cross beam 15, the binocular camera 4 is positioned at the bottom of the front end of the support cross beam 15, a camera fixing plate 11 is fixed at the top of the binocular camera 4 through a camera fixing screw 7, a wired laser fixing groove 9 is formed in the middle of the front side of the binocular camera 4, and the linear laser lamp 8 is fixedly nested in the wired laser fixing groove 9;
the image processing module comprises a computer processor 1, the computer processor 1 is located on one side of the camera support 3, and the computer processor 1 is connected with a binocular camera 4 and a line laser lamp 8 through a data transmission line 2.
Further, in the above technical scheme, a threaded rod 18 is fixed at the rear end of the support beam 15, the threaded rod 18 is nested in the support vertical groove 12, the threaded rod 18 and the support vertical groove 12 are connected in a sliding manner, and the threaded rod 18 moves up and down in the support vertical groove 12, so that the support beam 15 can move on the support vertical beam 14, and the height of the binocular camera 4 can be adjusted.
Further, in the above technical solution, the rear end of the threaded rod 18 penetrates through the vertical bracket slot 12 and is connected with a lock nut 19, the lock nut 19 is connected with the threaded rod 18 through threads, the overall diameter of the lock nut 19 is greater than the width of the vertical bracket slot 12, the threaded rod 18 can move in the vertical bracket slot 12 by turning and loosening the lock nut 19, the lock nut 19 is turned and tightened, the lock nut 19 is tightly contacted with the vertical bracket beam 14, the threaded rod 18 is fixed in the vertical bracket slot 12, and the threaded rod 18 cannot move, so that the horizontal bracket beam 15 is fixed.
Further, in the above technical scheme, the top of camera fixed plate 11 is fixed with slider 20, slider 20 card cover is in support cross slot 17, set up to sliding connection between slider 20 and support cross slot 17, slide in support cross slot 17 through slider 20 for binocular camera 4 can move on support crossbeam 15, thereby adjusts the horizontal position of binocular camera 4.
Further, in the above technical solution, the line laser lamp 8 is provided with the power line 10, which is convenient for charging the line laser lamp 8 so that the line laser lamp 8 works.
Further, in the above technical solution, a conveyor controller 6 is arranged on one side of the conveyor belt 5, the conveyor belt 5 is controlled by the conveyor controller 6 to work, and the rotating speed can be adjusted by the conveyor controller 6 according to the requirement.
Further, in the above technical solution, the vertical beam 14 of the bracket is made of a zinc steel material, and the zinc steel has the advantages of high strength, high hardness, beautiful appearance, bright color and the like, so that the vertical beam 14 of the bracket has a long service life and a beautiful appearance.
Further, in the above technical solution, the bracket beam 15 is made of a zinc steel material, so that the bracket beam 15 has a long service life and a fine appearance.
The implementation mode is specifically as follows: the working parameters of the binocular camera 4 are: the resolution is 1536 × 2048, the highest precision is +/-0.2 mm, the baseline distance is 160mm, the external interface USB is 3.0, and the maximum working distance is 10 m; the line laser lamp 8 is fixed at the front end of the binocular camera 4 through a line laser fixing groove 9 of the binocular camera 4, the wavelength of the line laser lamp 8 is 450nm, the voltage/power consumption is 5V/6-6W, the size L W H234W 60mm 85mm, and the weight is 0.75 kg; the length of the conveyor belt 5 is 1.5m, the width of the conveyor belt is 0.6m, and the rotating speed can be adjusted through a conveyor belt controller 6 according to needs; the resolution of the computer processor 1 is 1920 x 1080, the CPU requires the configuration above i5, the computer processor is provided with a USB3.0 interface, the memory above 8G, a 64-bit operating system, and the desktop is provided with an autonomous development image processing program;
firstly, washing and drying coarse aggregates to be detected, then placing the coarse aggregates on a conveyor belt 5, and using a tool to enable the coarse aggregates to be tiled on the conveyor belt and not to be adhered; secondly, turning loose a locking nut 19 to enable a threaded rod 18 to move in a support vertical groove 12, enabling a support cross beam 15 to move on the support vertical beam 14, adjusting the height of the binocular camera 4, turning tight the locking nut 19 to enable the locking nut 19 to be in close contact with the support vertical beam 14, fixing the threaded rod 18 in the support vertical groove 12 to enable the threaded rod 18 not to move, fixing the support cross beam 15, sliding in a support transverse groove 17 through a sliding block 20 to enable the binocular camera 4 to move on the support cross beam 15, adjusting the horizontal position of the binocular camera 4, turning on the binocular camera 4 and a line laser lamp 8 after adjusting the spatial positions of the binocular camera 4 and the line laser lamp 8, and starting a desktop program; clicking a program starting detection button, then starting the conveyor belt 5 to drive the coarse aggregates to move, clicking a program grading calculation button after all the coarse aggregates are scanned by the line laser lamp 8, and simultaneously pausing the conveyor belt 5; and finally, self-development program is adopted, noise reduction is carried out by adopting a median filtering algorithm, background optimization is realized by adopting a background difference method, the particle volume of the coarse aggregate is calculated by adopting a differential method, particle size calculation is carried out based on a spherical equivalent diameter algorithm, and grading detection is finally realized.
(1) The equivalent sphere diameter is also called as equivalent sphere diameter of equal volume, and is the sphere particle diameter with equal volume as the name implies, which means that a sphere is set, the volume of the sphere is equal to the volume of a single particle, and the diameter of the sphere is the equivalent sphere diameter of equal volume. Therefore, the equivalent spherical diameter is a size of a particle diameter expressed by a diameter of a sphere, and the formula is as follows:
(2) according to the grading calculation method, the passing percentage of a certain standard sieve can be calculated by the ratio of the accumulated oversize mass of the sieve to the total mass of the experiment, and the coarse aggregates obtained in the experiment are considered to have the same texture, so that the aggregate density is considered to be the same, and the formula (b) exists:
the total mass of the coarse aggregate measured in the experiment is M, the total volume of the sieve is V, and the total volume of the coarse aggregate is V. Therefore, the mass percentage is equivalent to the volume percentage when the coarse aggregate gradation is calculated, and the coarse aggregate gradation can be virtually measured according to the ratio of the accumulated volume of the coarse aggregates in a certain sieve pore to the total volume of the coarse aggregates to be measured.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a coarse aggregate gradation quick detection device based on laser scanning technique, includes image acquisition module and image processing module, its characterized in that: the image acquisition module comprises a binocular camera (4), a line laser lamp (8), a conveyor belt (5) and a camera support (3), the camera support (3) comprises a support base (16), the support base (16) is fixed on one side of the conveyor belt (5) through a base fixing screw (13), a support vertical beam (14) is fixed on the support base (16), a support vertical groove (12) is formed in the middle of the support vertical beam (14), a support cross beam (15) is arranged at the top of the support vertical beam (14), support cross grooves (17) are formed in the left side and the right side of the support cross beam (15), the binocular camera (4) is located at the bottom of the front end of the support cross beam (15), a camera fixing plate (11) is fixed at the top of the binocular camera (4) through a camera fixing screw (7), a wired laser fixing groove (9) is formed in the middle of the front side of the binocular camera (4), the line laser lamp (8) is fixedly nested in the line laser fixing groove (9);
the image processing module comprises a computer processor (1), the computer processor (1) is located on one side of the camera support (3), and the computer processor (1) is connected with a binocular camera (4) and a line laser lamp (8) through a data transmission line (2).
2. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: the rear end of the support beam (15) is fixed with a threaded rod (18), the threaded rod (18) is nested in the support vertical groove (12), and the threaded rod (18) and the support vertical groove (12) are connected in a sliding mode.
3. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 2, characterized in that: the rear end of the threaded rod (18) penetrates through the support vertical groove (12) and is connected with a locking nut (19), the locking nut (19) is connected with the threaded rod (18) through threads, and the overall diameter of the locking nut (19) is larger than the width of the vertical groove (12).
4. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: the top of camera fixed plate (11) is fixed with slider (20), slider (20) card cover is in support cross slot (17), set up to sliding connection between slider (20) and support cross slot (17).
5. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: the line laser lamp (8) is provided with a power line (10).
6. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: and a conveyor belt controller (6) is arranged on one side of the conveyor belt (5).
7. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: the support vertical beam (14) is made of a zinc steel material.
8. The laser scanning technology-based coarse aggregate grading rapid detection device according to claim 1, characterized in that: the support beam (15) is made of a zinc steel material.
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| CN113933216A (en) * | 2021-10-12 | 2022-01-14 | 长安大学 | On-spot real-time supervision device of edges and corners nature gathers materials |
| CN113933216B (en) * | 2021-10-12 | 2023-08-25 | 长安大学 | On-spot real-time supervision device of edges and corners nature gathers materials |
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