Multi-view three-dimensional vision-based coarse aggregate particle size distribution and grain type detection device

Abstract

The present application relates to the technical field of building material detection, and particularly relates to a coarse aggregate particle size distribution and grain type detection device based on multi-view three-dimensional vision, which comprises a rack, a coarse aggregate feeding frame, a feeding belt, a guide sheet metal, two discharge vibrating discs, a track conveying mechanism, a scraper mechanism and a photographing unit, the guide sheet metal is provided with two discharge ports, the coarse aggregate conveyed by the feeding belt is divided into two parts, preliminary shunting is realized, and single-path flow is reduced; secondly, the two discharge vibrating discs respectively receive the shunted coarse aggregate, the particles are naturally dispersed through vibration, and the output end of each discharge vibrating disc is provided with two side-by-side arranged discharge ports, the coarse aggregate is again shunted into four paths, finally, the four discharge ports simultaneously discharge the coarse aggregate to the downward sliding material receiving carrier plate, the continuous movement of the material receiving carrier plate causes the dropping points to be dispersed in different positions, and coarse aggregate stacking in the same area is avoided. The above structure significantly improves the grading statistical accuracy.

Description

Technical Field

[0001] This invention relates to the field of building material testing technology, and in particular to a coarse aggregate particle size distribution and particle shape testing device based on multi-view three-dimensional vision. Background Technology

[0002] Coarse aggregate refers to aggregate materials such as crushed stone, pebbles, or gravel with a particle size greater than 4.75mm, and is widely used in engineering structures such as concrete and asphalt mixtures. The gradation of coarse aggregate, that is, the percentage distribution of particles of different sizes in the total mass, is the core indicator for evaluating the quality of coarse aggregate.

[0003] Currently, intelligent detection of coarse aggregate gradation mainly adopts image analysis methods, which involves acquiring images of coarse aggregates with a camera and extracting particle size information using image recognition algorithms. Existing image analysis equipment typically includes a feeding mechanism, a conveying mechanism, and a photographing mechanism. The conveying mechanism usually uses a single belt or a single vibrating disc to transport the coarse aggregates to the photographing area, while the photographing mechanism usually uses a single camera to take pictures from a single angle.

[0004] However, in existing image analysis methods, coarse aggregates tend to stack and stick together during the conveying process, causing multiple particles to merge into one piece in the image. Image recognition algorithms cannot accurately distinguish the boundaries of individual particles, which seriously affects the accuracy of particle size statistics. Summary of the Invention

[0005] The purpose of this invention is to provide a coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision, which solves the problem in the prior art that coarse aggregates are prone to stacking and sticking together during the conveying process, causing image recognition algorithms to be unable to accurately distinguish the boundaries of individual particles, thus affecting the accuracy of gradation statistics.

[0006] To achieve the above objectives, the present invention provides a coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision. The coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision includes a frame, a coarse aggregate feed frame, a feed belt, a guide sheet metal, two discharge vibrating discs, a track conveying mechanism, a scraper mechanism, and a photographing unit. The coarse aggregate feed frame is fixedly installed above the frame, the feed belt is located below the coarse aggregate feed frame and fixed to the top of the frame, the guide sheet metal is fixedly connected to the frame and located at the output end of the feed belt, and the guide sheet metal is provided with two discharge ports. The frame is also equipped with two discharge vibratory feeders, each located below a discharge port. Each discharge vibratory feeder has two parallel discharge ports at its output end. The frame is also equipped with a track conveying mechanism at its inner bottom, with a slidable receiving plate on the track conveying mechanism located below the discharge port. The track conveying mechanism is also equipped with a scraper mechanism for scraping off coarse aggregate from the receiving plate. The frame is also equipped with a camera unit, with the camera end of the camera unit corresponding to the receiving plate.

[0007] The track conveying mechanism includes two track bodies, a drive assembly, and a mounting base. The two track bodies are arranged parallel to each other at the bottom of the frame. A mounting plate is provided between the ends of the two track bodies near the discharge vibratory plate, and the mounting base is provided between the ends of the two track bodies away from the discharge vibratory plate. A receiving plate is slidably arranged between the two track bodies. The drive assembly is provided between the mounting plate and the mounting base, and the output end of the drive assembly is connected to the receiving plate.

[0008] The drive assembly includes a drive motor, a drive wheel, a driven wheel, a transmission belt, and a connecting seat. The drive motor is mounted on the mounting plate, and the drive wheel is located at the output end of the drive motor. The driven wheel is rotatably mounted on the top of the mounting seat. The transmission belt is located between the drive wheel and the drive wheel, and the connecting seat is located on the transmission belt. The connecting seat is connected to the receiving plate.

[0009] The scraper mechanism includes two electric push rods, two sliding guide rails, two sliding seats, two cylinders, and a scraper. The electric push rod is installed on the side of each track body near the discharge vibratory plate, and the sliding guide rail is installed on the side of each track body away from the discharge vibratory plate. The sliding seat is slidably disposed on the sliding guide rail. The output end of the electric push rod is connected to the sliding seat. The cylinder is installed on each sliding seat, and the scraper is installed between the output ends of two cylinders.

[0010] The imaging unit consists of three binocular structured light 3D cameras, each of which is mounted on the frame and the imaging end of each camera corresponds to the receiving carrier plate.

[0011] The frame is also equipped with a housing and an openable maintenance door. The housing forms a closed inner cavity, in which the discharge vibratory feeder, the track conveying mechanism, and the scraper mechanism are all located. The top of the housing is provided with a feeding port, and the coarse aggregate feed frame is installed at the feeding port. The maintenance door is located at one end of the frame near the discharge vibratory feeder and on the side of the frame.

[0012] The frame is equipped with casters at each of its four corners.

[0013] This invention discloses a coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision, comprising a frame, a coarse aggregate feed frame, a feed belt, a guide sheet metal, two discharge vibrating discs, a track conveying mechanism, a scraper mechanism, and a photographing unit. The guide sheet metal is provided with two discharge ports, which divide the coarse aggregate conveyed by the feed belt into two parts to achieve initial diversion and reduce the flow rate of a single path. Secondly, the two discharge vibrating discs receive the diverted coarse aggregate respectively, and the particles are naturally dispersed by vibration. Each discharge vibrating disc has two parallel discharge ports at its output end, which further divide the coarse aggregate into four paths, further reducing the drop density per unit time. Finally, the four discharge ports simultaneously discharge the material onto the receiving plate that slides downwards. The continuous movement of the receiving plate disperses the drop points at different locations, preventing the coarse aggregate from accumulating in the same area. The above structure allows the coarse aggregate to be distributed in a single layer on the receiving plate, effectively avoiding particle stacking and adhesion, ensuring that the image recognition algorithm can accurately distinguish the boundaries of individual particles, thereby significantly improving the accuracy of gradation statistics. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the external structure of the coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision provided by the present invention.

[0016] Figure 2 This is a partial structural schematic diagram of the coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision provided by the present invention.

[0017] Figure 3 This invention provides Figure 2 A structural diagram from another perspective.

[0018] Figure 4This is a schematic diagram of the track conveying mechanism provided by the present invention.

[0019] Figure 5 This invention provides Figure 4 A structural diagram from another perspective.

[0020] 101-Frame, 102-Coarse aggregate feed frame, 103-Feed belt, 104-Guide sheet metal, 105-Discharge vibratory feeder, 106-Discharge port, 107-Outlet port, 108-Receiving plate, 109-Railway body, 110-Mounting base, 111-Mounting plate, 112-Drive motor, 113-Drive wheel, 114-Driven wheel, 115-Transmission belt, 116-Connecting seat, 117-Electric push rod, 118-Sliding guide rail, 119-Sliding seat, 120-Cylinder, 121-Scraper, 122-Binocular structured light 3D camera, 123-Housing, 124-Inspection door, 125-Feeding port, 126-Universal wheel. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] Please see Figures 1 to 5 This invention provides a coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision. The coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision includes a frame 101, a coarse aggregate feed frame 102, a feed belt 103, a guide sheet metal 104, two discharge vibrating discs 105, a track conveying mechanism, a scraper mechanism, and a photographing unit. The coarse aggregate feed frame 102 is fixedly installed above the frame 101. The feed belt 103 is located below the coarse aggregate feed frame 102 and fixed to the top of the frame 101. The guide sheet metal 104 is fixedly connected to the frame 101 and located at the output end of the feed belt 103. The guide sheet metal 104 is provided with two discharge ports 106. The frame 101 is also equipped with two discharge vibratory feeders 105, each of which is located below a discharge port 106. Each discharge vibratory feeder 105 has two parallel discharge ports 107 at its output end. The bottom of the frame 101 is also equipped with a track conveying mechanism, on which a slidable receiving plate 108 is provided. The receiving plate 108 is located below the discharge port 107. The track conveying mechanism is also equipped with a scraper mechanism, which is used to scrape off the coarse aggregate on the receiving plate 108. The frame 101 is also equipped with a photographing unit, the photographing end of which corresponds to the receiving plate 108.

[0023] In this embodiment, the guide sheet metal 104 is provided with two discharge ports 106, which divide the coarse aggregate conveyed by the feed belt 103 into two, achieving initial diversion and reducing the flow rate per channel. Secondly, two discharge vibrating discs 105 receive the diverted coarse aggregate, and vibration causes the particles to disperse naturally. Each discharge vibrating disc 105 has two parallel discharge ports 107 at its output end, further diverting the coarse aggregate into four channels, further reducing the material density per unit time. Finally, the four discharge ports 107 simultaneously discharge material onto the receiving plate 108, which slides downwards. The continuous movement of the receiving plate 108 disperses the material at different locations, preventing coarse aggregate from accumulating in the same area. Using this structure, the coarse aggregate is arranged in a single layer on the receiving plate 108, effectively preventing particle stacking and adhesion, ensuring that the image recognition algorithm can accurately distinguish individual particle boundaries, thereby significantly improving the accuracy of gradation statistics.

[0024] Furthermore, the track conveying mechanism includes two track bodies 109, a drive assembly, and a mounting base 110. The two track bodies 109 are arranged parallel to each other at the inner bottom of the frame 101. A mounting plate 111 is provided between the ends of the two track bodies 109 near the discharge vibratory plate 105, and the mounting base 110 is provided between the ends of the two track bodies 109 away from the discharge vibratory plate 105. A receiving plate 108 is slidably arranged between the two track bodies 109. The drive assembly is provided between the mounting plate 111 and the mounting base 110, and the output end of the drive assembly is connected to the receiving plate 108.

[0025] In this embodiment, the receiving plate 108 is guided by two parallel track bodies 109 to ensure the stability of the receiving plate 108 during the sliding process. The mounting plate 111 and the mounting base 110 provide a stable mounting foundation for the drive assembly, ensuring that the receiving plate 108 can slide back and forth along the track bodies 109 to complete the receiving, photographing and discharging processes in sequence.

[0026] Furthermore, the drive assembly includes a drive motor 112, a drive wheel 113, a driven wheel 114, a transmission belt 115, and a connecting seat 116. The drive motor 112 is mounted on the mounting plate 111, and the drive wheel 113 is provided at the output end of the drive motor 112. The driven wheel 114 is rotatably mounted on the top of the mounting seat 110. The transmission belt 115 is provided between the drive wheel 113 and the drive wheel, and the connecting seat 116 is provided on the transmission belt 115. The connecting seat 116 is connected to the receiving carrier plate 108.

[0027] In this embodiment, the drive motor 112 drives the transmission belt 115 to rotate through the drive wheel 113, and the connecting seat 116 on the transmission belt 115 drives the receiving plate 108 to move synchronously. This belt drive method has a compact structure and runs smoothly, and can accurately control the moving speed and position of the receiving plate 108, which is convenient for coordination with the material discharge and photography processes.

[0028] Furthermore, the scraper mechanism includes two electric push rods 117, two sliding guide rails 118, two sliding seats 119, two cylinders 120, and a scraper 121. The electric push rod 117 is installed on the side of each track body 109 near the end of the discharge vibrating plate 105, and the sliding guide rail 118 is installed on the side of each track body 109 away from the discharge vibrating plate 105. The sliding seat 119 is slidably disposed on the sliding guide rail 118. The output end of the electric push rod 117 is connected to the sliding seat 119. The cylinder 120 is installed on each sliding seat 119, and the scraper 121 is installed between the output ends of two cylinders 120.

[0029] In this embodiment, the electric push rod 117 drives the sliding seat 119 to move along the sliding guide rail 118, thereby enabling the scraper 121 to slide along the track body 109. The cylinder 120 drives the scraper 121 to rise and fall, allowing the scraper 121 to descend and contact the receiving plate 108. Driven by the electric push rod 117, the scraper 121 scrapes off the coarse aggregate on the receiving plate 108. After scraping is completed, the cylinder 120 drives the scraper 121 to rise and reset, thus achieving automatic scraping and discharge without manual intervention.

[0030] Furthermore, the imaging unit consists of three binocular structured light 3D cameras 122, each of which is mounted on the frame 101, and the imaging end of each of the binocular structured light 3D cameras 122 corresponds to the receiving carrier plate 108.

[0031] In this embodiment, three perspectives are used (each perspective corresponds to one binocular structured light 3D camera 122) primarily to acquire 3D point cloud images of coarse aggregate particles from various angles, which are then stitched together into a complete particle point cloud using an algorithm. Specifically, the three binocular structured light 3D cameras 122 are distributed at predetermined angular intervals (e.g., 120° intervals) around the circumference of the receiving plate 108, thereby simultaneously capturing images of the coarse aggregate particles on the receiving plate 108 from different directions. Each binocular structured light 3D camera 122 acquires local point cloud data from its corresponding perspective; the three sets of local point clouds are transformed to the same world coordinate system using pre-calibrated system parameters, and after point cloud registration, denoising, and fusion, a complete and unobstructed global 3D point cloud model of the coarse aggregate particle surface can be reconstructed. A three-view layout can achieve full coverage of the outer surface of coarse aggregate particles, avoiding data loss caused by self-occlusion or shadow areas due to a single view. At the same time, compared with a four-view or more view arrangement, it can effectively reduce the number of cameras while ensuring the integrity of the point cloud, thereby reducing hardware costs, simplifying the system calibration process and reducing data redundancy.

[0032] Furthermore, the frame 101 is also provided with a housing 123 and an openable maintenance door 124. The housing 123 forms a closed inner cavity, in which the discharge vibratory plate 105, the track conveying mechanism, and the scraper mechanism are all disposed. The top of the housing 123 is provided with a feeding port 125, and the coarse aggregate feeding frame 102 is installed at the feeding port 125. The maintenance door 124 is located at one end of the frame 101 near the discharge vibratory plate 105 and on the side of the frame 101.

[0033] In this embodiment, the enclosed housing 123 structure can effectively prevent external dust from entering the equipment, avoiding dust contamination of the aggregate or interference with camera shooting, while encapsulating moving parts inside to improve equipment safety; the inspection door 124 facilitates maintenance and cleaning of internal components by operators.

[0034] Furthermore, casters 126 are provided at each of the four corners of the frame 101.

[0035] In this embodiment, the casters 126 enable the entire device to be mobile, facilitating flexible transfer on the production site. At the same time, the casters 126 have a locking function, which can fix the device in the working position and ensure operational stability.

[0036] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A coarse aggregate particle size distribution and particle shape detection device based on multi-view three-dimensional vision, characterized in that, The device includes a frame, a coarse aggregate feed frame, a feed belt, a guide sheet metal, two discharge vibratory feeders, a track conveying mechanism, a scraper mechanism, and a photographing unit. The coarse aggregate feed frame is fixedly installed above the frame, the feed belt is located below the coarse aggregate feed frame and fixed to the top of the frame, the guide sheet metal is fixedly connected to the frame and located at the output end of the feed belt, and the guide sheet metal is provided with two discharge ports. The frame is also equipped with two discharge vibratory feeders, each located below a discharge port. Each discharge vibratory feeder has two parallel discharge ports at its output end. The frame is also equipped with a track conveying mechanism at its inner bottom, with a slidable receiving plate on the track conveying mechanism located below the discharge port. The track conveying mechanism is also equipped with a scraper mechanism for scraping off coarse aggregate from the receiving plate. The frame is also equipped with a camera unit, with the camera end of the camera unit corresponding to the receiving plate.

2. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 1, characterized in that, The track conveying mechanism includes two track bodies, a drive assembly, and a mounting base. The two track bodies are arranged parallel to each other at the inner bottom of the frame. A mounting plate is provided between the ends of the two track bodies near the discharge vibratory plate, and the mounting base is provided between the ends of the two track bodies away from the discharge vibratory plate. A receiving plate is slidably arranged between the two track bodies. The drive assembly is provided between the mounting plate and the mounting base, and the output end of the drive assembly is connected to the receiving plate.

3. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 2, characterized in that, The drive assembly includes a drive motor, a drive wheel, a driven wheel, a transmission belt, and a connecting seat. The drive motor is mounted on the mounting plate, and the drive wheel is located at the output end of the drive motor. The driven wheel is rotatably mounted on the top of the mounting seat. The transmission belt is located between the drive wheel and the drive wheel, and the connecting seat is located on the transmission belt. The connecting seat is connected to the receiving plate.

4. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 3, characterized in that, The scraper mechanism includes two electric push rods, two sliding guide rails, two sliding seats, two cylinders, and scrapers. Each track body has an electric push rod installed on its side near the discharge vibratory plate, and a sliding guide rail is installed on its side away from the discharge vibratory plate. The sliding seats are slidably mounted on the sliding guide rails. The output end of each electric push rod is connected to the sliding seat. Each sliding seat has a cylinder installed on it, and the scraper is installed between the output ends of two cylinders.

5. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 4, characterized in that, The imaging unit consists of three binocular structured light 3D cameras, each of which is mounted on the frame, and the imaging end of each binocular structured light 3D camera corresponds to the receiving carrier plate.

6. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 5, characterized in that, The frame is also equipped with a housing and an openable maintenance door. The housing forms a closed inner cavity. The discharge vibratory feeder, the track conveying mechanism, and the scraper mechanism are all located in the closed inner cavity. The top of the housing is provided with a feeding port. The coarse aggregate feed frame is installed at the feeding port. The maintenance door is located at one end of the frame near the discharge vibratory feeder and on the side of the frame.

7. The coarse aggregate particle size distribution and particle shape detection equipment based on multi-view three-dimensional vision as described in claim 6, characterized in that, The frame is equipped with casters at all four corners.

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