Aggregate particle size on-line detection and automatic grading device for precast brick production

Abstract

This invention discloses an online aggregate particle size detection and automatic gradation device for precast brick production, relating to the field of precast brick production. The device is configured as a dynamic gradation control system integrating real-time online particle size detection, automatic multi-source aggregate proportioning, and closed-loop feedback control. This dynamic gradation control system includes an aggregate storage and feeding module, an online particle size detection module, and a gradation control host. The aggregate storage and feeding module stores raw aggregates of different specifications and performs metering and feeding. This online aggregate particle size detection and automatic gradation device integrates online detection, automatic sampling, and closed-loop feedback control functions, enabling real-time monitoring and adaptive dynamic adjustment of aggregate gradation, meeting the precise quality control requirements of high-cycle, continuous precast brick production.

Description

Technical Field

[0001] This invention relates to precast brick production technology, specifically to an online detection and automatic gradation device for aggregate particle size in precast brick production. Background Technology

[0002] In the industrial production of precast bricks (including concrete bricks, permeable bricks, kerbstones, etc.), the aggregate particle size distribution is one of the core process parameters that determines the mechanical properties, durability, appearance quality, and production cost of the final product. Currently, the industry commonly adopts a production model combining pre-laboratory sampling and screening with fixed proportions: batches of incoming aggregates are sampled, and their particle size distribution data is obtained through standard screening tests. Based on this data and product formulation requirements, the feeding ratio of each aggregate bin in the mixing plant or batching system is manually calculated and set. While this model is widely used, it has the following significant technical drawbacks:

[0003] The testing process is severely lagging and cannot respond to material fluctuations in real time: Laboratory screening is time-consuming, and the test results lag far behind the actual production process. Furthermore, aggregates, especially those from recycled resources or natural mineral sources, may exhibit significant fluctuations in particle size distribution within the same batch and even at different feeding times. Fixed proportions cannot handle these real-time fluctuations, causing the actual aggregate gradation entering the mixer to deviate from the design target, resulting in unstable key quality indicators such as product strength and porosity, and large batch-to-batch variations.

[0004] Insufficient representativeness of sampling leads to blind spots in quality control: Sampling inspections cannot cover all materials, especially for aggregates with poor uniformity. The sampling results are difficult to accurately and comprehensively reflect the particle size distribution of the entire stockpile or the continuous feeding process.

[0005] To overcome the above-mentioned shortcomings and achieve real-time online detection and automatic gradation adjustment of aggregate particle size, the following technical solutions are disclosed in the prior art:

[0006] 1) Patent application CN117415046A discloses a continuous detection and adjustment system for aggregate gradation based on structured light technology. This patent application includes a multi-stage aggregate screening system and a structured light gradation control system. The multi-stage aggregate screening system includes a support frame, screening box, feed hopper, and multiple screening outlets. The structured light gradation control system includes a detection interface, aggregate collection box, background plate, and structured light detection mechanism. This invention overcomes the shortcomings of existing technologies, enabling batch particle size identification of aggregates and automatic adjustment for preset particle size distributions. It can meet the needs of construction sites for aggregates with preset gradation curves and features high automation, good repeatability, and high precision.

[0007] 2) Publication No. CN118698413A discloses an intelligent automatic batching system for asphalt concrete mixing plants. This patent application includes a batching information import module, a material status monitoring module, an environmental status monitoring module, a material metering confirmation module, a raw material processing monitoring module, a raw material processing analysis module, and a batching processing execution terminal. This invention analyzes the differences in aggregate moisture content at different times and depths, and analyzes aggregate particle size distribution using images taken from different angles. This allows for the analysis of aggregate addition adjustment types. Furthermore, it confirms batching control information through aggregate heating status information. This effectively solves the problem of insufficient consideration in current batching methods, avoids the errors inherent in considering only static physical properties, and significantly improves the accuracy of subsequent batching settings and batching precision, providing a strong guarantee for the production quality of asphalt concrete.

[0008] However, the aforementioned existing technical solutions still have room for improvement. For example, although the system disclosed in publication number CN117415046A achieves gradation detection and adjustment, its core detection object is static or quasi-static aggregate after multi-stage screening. Essentially, it is still an intermittent or batch processing mode, making it difficult to achieve truly online, real-time, and seamless detection of continuous aggregate flow. Moreover, its system structure is complex, involving multiple links such as screening, collection, and re-detection, and its response speed and integration need to be improved. It is not suitable for modern precast brick production lines with extremely high requirements for production cycle and continuity. The solution in publication number CN118698413A focuses more on the comprehensive batching optimization of asphalt concrete mixing plants. Its detection and analysis dimensions are complex, and the system is large. The aggregate particle size analysis is mainly based on the analysis of fixed stockpiles or specific containers using multi-view images, rather than direct and continuous online sampling and detection of the dynamically conveyed aggregate flow on the main production line. It is difficult to directly transplant and meet the needs of high-frequency, real-time, and closed-loop control of aggregate gradation in precast brick production.

[0009] Therefore, existing technologies lack an automatic gradation device that can be directly integrated into the end of the aggregate conveyor belt of a precast brick production line to automatically sample and perform real-time online particle size analysis on the continuously conveyed aggregate flow, and based on this, provide feedback control to the feeders of multiple upstream aggregate bins. Summary of the Invention

[0010] The purpose of this invention is to provide an online aggregate particle size detection and automatic gradation device for precast brick production, in order to solve the problems in the prior art where aggregate particle size detection cannot be performed synchronously and in real time with the continuous production line, gradation adjustment response is lagging, and there is a lack of direct feedback control on dynamic aggregate flow, resulting in large fluctuations in the quality of precast brick production.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an online aggregate particle size detection and automatic gradation device for precast brick production, wherein the online aggregate particle size detection and automatic gradation device is configured as a dynamic gradation control system integrating real-time online particle size detection, automatic proportioning of multi-source aggregates, and closed-loop feedback control, the dynamic gradation control system comprising:

[0012] The aggregate storage and feeding module is used to store raw aggregates of different specifications and to meter and feed them. The aggregate storage and feeding module includes multiple aggregate bins arranged side by side, a variable frequency feeder located below the discharge port of each aggregate bin, and a collection belt located below the multiple variable frequency feeders for receiving and conveying aggregates from each aggregate bin.

[0013] An online particle size detection module is configured at the end of the aggregate conveyor belt and is used to perform real-time, continuous particle size distribution detection on a single aggregate or aggregate stream before mixing. The online particle size detection module has a sampling unit, a detection box, and a constant speed conveying channel. The detection box is mounted on one side of the aggregate conveyor belt via a frame. The detection box is a sealed darkroom structure with a sealed feed inlet at the top and a high-speed industrial camera, an array-type structured light source, and a high-contrast backlight imaging plate inside. The sampling unit is located on the upper side of the aggregate conveyor belt and is connected to the sealed feed inlet through a T-shaped negative pressure conveying channel.

[0014] The gradation control host includes a gradation execution unit installed at the drive end of each variable frequency feeder and directly controlling its feeding rate with electrical signals, a data processing unit for receiving signals from the online particle size detection module and calculating the particle size distribution, and a logic control unit embedded with a preset target gradation curve and feedback control algorithm. The logic control unit is electrically connected to the data processing unit and the gradation execution unit, and forms a closed-loop control circuit.

[0015] Furthermore, the sampling unit includes a sampling head, a sampling drive component, a side bracket, a disc, a rotating rod, a first swing arm, a V-shaped connecting rod, a second swing arm, a first mounting arm, and a second mounting arm. The side bracket is connected to the side wall of the detection box via a support rod, and the side bracket has a long opening in the middle. The first mounting arm and the second mounting arm are respectively hinged to both sides of the long opening of the side bracket.

[0016] Furthermore, the sampling drive is fixed to the bottom side of the side bracket, and the shaft end of the sampling drive is connected to a disk, the eccentric side of the disk end face is hinged to a rotating rod.

[0017] Furthermore, the first swing arm and the V-shaped connecting rod are coaxially hinged to the free end of the rotating rod, the middle of the V-shaped connecting rod is movably connected to the bottom side of the side support, and the upper end of the V-shaped connecting rod is hinged to the second swing arm.

[0018] Furthermore, the first swing arm is hinged to the first mounting arm at its end, and the second swing arm is hinged to the second mounting arm at its end. Both the first and second mounting arms are equipped with grooves, on which multiple sampling heads are mounted. Since the distribution of aggregate on the conveyor belt may be non-uniform over time and under varying operating conditions, to meet the need for comprehensive and representative sampling of aggregate from different areas, the coordinated swinging of the first and second mounting arms under the control of the drive mechanism allows for flexible adjustment of the sampling head's coverage area in the belt width direction. This ensures that even with dynamic changes in aggregate distribution, the equipment can still collect representative test samples, guaranteeing the accuracy and reliability of subsequent particle size analysis data.

[0019] Furthermore, the multiple sampling heads include a vacuum suction head, a micro slide, an electric cylinder, and a back plate. The back plate is connected to a sliding groove via a nut. A micro slide is installed on the front side of the back plate, and an electric cylinder is mounted on the upper side of the back plate. The vacuum suction head is slidably connected to the micro slide, and the free end of the electric cylinder is connected to the upper end of the vacuum suction head. The multiple sampling heads can operate collaboratively or independently according to control logic. On the one hand, when uneven aggregate distribution is detected in a specific area of ​​the conveyor belt, a single sampling head can be controlled to perform targeted and enhanced sampling in that area, improving the representativeness of the sample. On the other hand, under normal production cycle time, multiple sampling heads can work alternately or collaboratively, achieving high-frequency, continuous sampling without interrupting the conveyor belt operation. This ensures the real-time and continuous nature of the detection data, effectively avoiding detection blind spots and data lag that may be caused by single-point or low-frequency sampling.

[0020] Furthermore, the constant speed conveying channel is located within a sealed darkroom structure. The inlet end of the constant speed conveying channel is vertically connected to the outlet below the sealed inlet, and its outlet end extends above the center area of ​​the field of view of the high-speed industrial camera.

[0021] Furthermore, the constant-speed conveying channel is a vibrating conveying chute with material equalization function. The constant-speed conveying channel can ensure the stability of the sample layer thickness and distribution in the detection area, providing a guarantee for subsequent high-precision image acquisition and particle size analysis.

[0022] Compared with existing technologies, the online aggregate particle size detection and automatic gradation device for precast brick production provided by this invention integrates online detection, automatic sampling, and closed-loop feedback control. It utilizes machine vision to directly and continuously sample and detect the aggregate flow on the production line, and adjusts the upstream feed ratio in real time through the control host. This enables real-time monitoring and adaptive dynamic adjustment of aggregate gradation, meeting the precise quality control requirements of high-cycle, continuous precast brick production. Specific technical effects include the following:

[0023] 1. The online particle size detection module can be linked with the gradation control host to form a fast closed-loop control loop. It can complete the entire process from sampling, detection, analysis to feed ratio adjustment within seconds, and realize dynamic compensation for aggregate gradation fluctuations.

[0024] 2. The online particle size detection module adopts a closed dark box structure. It automatically extracts aggregate samples from the aggregate conveyor belt through the sampling unit, effectively avoiding external light interference and ensuring clear and stable imaging. In addition, the sampling unit includes a sampling head that, in conjunction with the sampling drive component, the first swing arm, and the second swing arm, swings in tandem with the first and second mounting arms, achieving flexible and variable lateral sampling trajectory and range to adapt to the sampling needs at different positions on the conveyor belt. Furthermore, the sampling head can move independently downward under the drive of an electric cylinder, allowing its end suction head to accurately contact the aggregate surface for negative pressure sampling. Afterward, it is lifted and reset, and the sample is transported to the detection area without damage using a T-shaped negative pressure conveying channel.

[0025] 3. The constant-speed feeding channel can evenly spread the suctioned aggregate sample and transport it at a constant speed, ensuring that the sample particles form a stable single-layer distribution in the detection area, avoiding the impact of aggregate overlap and uneven speed on the machine vision detection accuracy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the material conveyor belt, online particle size detection module, and gradation control host in Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the detection box in Embodiment 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of the sampling unit in Embodiment 2 of the present invention;

[0031] Figure 5 This is a schematic diagram of the sampling head in Embodiment 2 of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Aggregate bin; 2. Variable frequency feeder; 3. Aggregate belt; 4. Sampling unit; 41. Sampling head; 411. Vacuum suction head; 412. Miniature slide table; 413. Electric cylinder; 414. Back plate; 42. Sampling drive component; 43. Side support; 44. Disc; 45. First swing arm; 46. V-shaped connecting rod; 47. Second swing arm; 48. First mounting arm; 49. Second mounting arm; 5. Detection box; 6. Constant speed conveying channel; 7. T-shaped negative pressure conveying channel; 8. Grading control host. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As attached Figure 1 To be continued Figure 3 As shown:

[0036] Example 1:

[0037] This invention provides an online aggregate particle size detection and automatic gradation device for precast brick production. The online aggregate particle size detection and automatic gradation device is configured as a dynamic gradation control system integrating real-time online particle size detection, automatic proportioning of multi-source aggregates and closed-loop feedback control. The dynamic gradation control system includes an aggregate storage and feeding module, an online particle size detection module and a gradation control host 8.

[0038] 1. In one embodiment of the present invention, the aggregate storage and feeding module is used to store raw aggregates of different specifications and to meter and feed them. The aggregate storage and feeding module includes multiple aggregate bins 1 arranged side by side, a variable frequency feeder 2 located below the discharge port of each aggregate bin 1, and a collection belt 3 located below the multiple variable frequency feeders 2 for receiving and conveying the aggregates of each aggregate bin 1.

[0039] 2. In one embodiment of the present invention, the online particle size detection module is configured at the end of the aggregate conveyor belt 3 and is used to perform real-time and continuous particle size distribution detection on a single aggregate or aggregate flow before mixing. The online particle size detection module has a sampling unit 4, a detection box 5 and a constant speed conveying channel 6. The detection box 5 is mounted on one side of the aggregate conveyor belt 3 via a frame. The detection box 5 is a sealed darkroom structure with a sealed feed inlet at the top and a high-speed industrial camera, an array-type structured light source and a high-contrast backlight imaging plate inside. The sampling unit 4 is located on the upper side of the aggregate conveyor belt 3 and is connected to the sealed feed inlet through a T-shaped negative pressure conveying channel 7. The sampling unit 4 is a sampling robotic arm structure.

[0040] 3. In one embodiment of the present invention, the gradation control host 8 includes a gradation execution unit installed at the drive end of each variable frequency feeder 2 and directly controlling its feeding rate with electrical signals, a data processing unit for receiving signals from the online particle size detection module and calculating the particle size distribution, and a logic control unit embedded with a preset target gradation curve and feedback control algorithm, wherein the logic control unit is electrically connected to the data processing unit and the gradation execution unit and forms a closed-loop control circuit.

[0041] 4. In one embodiment of the present invention, the constant-speed conveying channel 6 is disposed within a sealed darkroom structure. The inlet end of the constant-speed conveying channel 6 is vertically connected to the lower outlet of the sealed inlet, and its outlet end extends above the center area of ​​the field of view of the high-speed industrial camera. The constant-speed conveying channel 6 is a vibrating conveying chute with a material equalization function. The constant-speed conveying channel 6 can ensure the stability of the sample layer thickness and distribution in the detection area, providing a guarantee for subsequent high-precision image acquisition and particle size analysis.

[0042] Working principle: Example 1 integrates sampling, conveying, sealed dark box imaging and closed-loop control to build a continuous and real-time online detection and automatic gradation adjustment scheme for aggregate particle size. It can dynamically monitor and adjust aggregate gradation without interrupting production. In particular, when the aggregate source is complex or the particle size fluctuates greatly, the host can respond quickly and automatically compensate, significantly improving the quality stability of precast brick products.

[0043] As attached Figure 4 As shown:

[0044] Example 2:

[0045] This embodiment is basically the same as the previous embodiment, except that the sampling unit 4 includes a sampling head 41, a sampling drive component 42, a side bracket 43, a disc 44, a rotating rod, a first swing rod 45, a V-shaped connecting rod 46, a second swing rod 47, a first mounting arm 48, and a second mounting arm 49. The side bracket 43 is connected to the side wall of the detection box 5 through a support rod. The side bracket 43 has a long opening in the middle. The first mounting arm 48 and the second mounting arm 49 are respectively hinged to both sides of the long opening of the side bracket 43.

[0046] 1. In one embodiment of the present invention, the sampling drive 42 is fixed to the bottom side of the side bracket 43, and the shaft end of the sampling drive 42 is connected to the disk 44. The eccentric side of the end face of the disk 44 is hinged to the rotating rod. The first swing rod 45 and the V-shaped connecting rod 46 are both coaxially hinged to the free end of the rotating rod. The middle of the V-shaped connecting rod 46 is movably connected to the bottom side of the side bracket 43, and the upper end of the V-shaped connecting rod 46 is hinged to the second swing rod 47.

[0047] 2. In one embodiment of the present invention, the first swing arm 45 is hinged to the end of the first mounting arm 48, and the second swing arm 47 is hinged to the end of the second mounting arm 49. Both the first mounting arm 48 and the second mounting arm 49 are provided with sliding grooves, and multiple sampling heads 41 are installed on the sliding grooves. Since the distribution of aggregate on the conveyor belt may be non-uniform over time and under different working conditions, in order to meet the need for comprehensive, representative / targeted sampling of aggregate in different areas, the coordinated swing of the first mounting arm 48 and the second mounting arm 49 under the control of the drive mechanism can be used to achieve flexible and adjustable coverage of the sampling head 41 in the belt width direction. This ensures that even in the face of dynamic changes in aggregate distribution, the equipment can still collect representative test samples, thus guaranteeing the accuracy and reliability of subsequent particle size analysis data.

[0048] As attached Figure 5 As shown:

[0049] 3. In one embodiment of the present invention, the plurality of sampling heads 41 include a vacuum suction head 411, a micro slide 412, an electric cylinder 413, and a back plate 414. The back plate 414 is connected to a sliding groove by a nut. The micro slide 412 is provided on the front side of the back plate 414, and the electric cylinder 413 is installed on the upper side of the back plate 414. The vacuum suction head 411 is slidably connected to the micro slide 412, and the free end of the electric cylinder 413 is connected to the upper end of the vacuum suction head 411. The plurality of sampling heads 41 can operate collaboratively or independently according to the control logic. On the one hand, when uneven aggregate distribution is detected in a specific area of ​​the belt, a single sampling head 41 can be controlled to perform targeted and enhanced sampling in that area to improve the representativeness of the sample. On the other hand, under normal production cycle, the plurality of sampling heads 41 can work alternately or collaboratively to achieve high-frequency and continuous sampling without interrupting the belt operation, thereby ensuring the real-time and continuous nature of the detection data and effectively avoiding detection blind spots and data lag that may be caused by single-point or low-frequency sampling.

[0050] Working principle: Since the aggregate distribution in different areas of the aggregate belt 3 is somewhat different, Example 2 adopts a multi-arm swing sampling unit 4 based on linkage transmission on the basis of Example 1. This realizes the flexible positioning and coverage of the sampling point in the width direction of the belt. Combined with multiple sampling heads 41 that can be independently raised, lowered and adsorbed, it not only meets the needs of obtaining aggregate samples under complex working conditions, but also significantly improves the detection host's ability to capture instantaneous fluctuations and uneven spatial distribution of aggregate gradation and response accuracy through multi-point and high-frequency sampling strategy.

[0051] In conjunction with Embodiments 1 and 2 above, the present invention also provides a method for using the above-mentioned online particle size detection and automatic gradation device for precast brick production, comprising the following steps:

[0052] Step 1: Start the equipment, select the precast brick product model through the human-machine interface of the gradation control host 8, and automatically load the corresponding target aggregate gradation curve; set the initial feeding ratio of the variable frequency feeder 2 corresponding to each aggregate bin 1, and set the sampling frequency, image acquisition parameters and particle size analysis algorithm parameters of the online particle size detection module.

[0053] Step 2: The gradation control host 8 sends instructions to each frequency converter 2 according to the initial ratio, and each aggregate bin 1 feeds materials according to the set ratio; the aggregates are collected and mixed by the collection belt 3 to form a continuous aggregate flow and conveyed to the online particle size detection module.

[0054] Step 3: The sampling drive unit 42 drives the first mounting arm 48 and the second mounting arm 49 to swing in coordination through the disc 44, rotating rod and linkage mechanism, so that the sampling head 41 on it covers different areas of the belt; the sampling head 41 is controlled to descend under the drive of the electric cylinder 413, and the suction head completes the adsorption sampling. The sample is sent into the detection box 5 through the T-shaped negative pressure conveying channel 7.

[0055] Step 4: The aggregate sample entering the detection box 5 falls into the constant speed conveying channel 6 through the sealed feed port, is evenly spread into a stable thin layer and passes through the field of view of the high-speed industrial camera at a constant speed; the array-type structured light source and the high-contrast backlight imaging plate provide a stable and high-contrast lighting environment for the camera, and the camera continuously acquires images of the aggregate sample.

[0056] Step 5: The image processing unit processes the acquired continuous image frames, identifies individual aggregate particles through edge detection and image segmentation algorithms, and calculates the projected area and equivalent particle size of each particle. The number or area weight of particles in each frame of the image is statistically analyzed according to the preset equivalent particle size range, and the real-time cumulative percentage distribution is calculated and output. At the same time, abnormally sized particles, such as those >30mm or >50mm, are marked.

[0057] Step Six: The logic control unit of the gradation control host 8 receives... Then, the following algorithm flow is executed:

[0058] Uniformity assessment and sampling strategy adjustment: Calculate the current gradation uniformity coefficient .like or If the uniformity is found to be abnormal, the system automatically increases the sampling frequency of the online detection module and instructs sampling unit 4 to switch to multi-point collaborative sampling mode to enhance sample representativeness.

[0059] Grading deviation quantification: based on multiple preset key equivalent particle size thresholds Above, calculate the deviation sequence between the real-time gradation and the target gradation. .

[0060] Rolling optimization solution: The optimization problem within a rolling time window (e.g., data from the most recent 5 minutes) is established and solved with the objective of minimizing gradation deviation.

[0061]

[0062] in, The desired feeding speed is the variable frequency feeder 2 of each aggregate bin 1. The solution process must satisfy the upper and lower speed limits of each feeder and the current inventory of the bin.

[0063] Command output: The optimal combination of feeding speeds obtained by the optimization algorithm is sent to the corresponding gradation execution unit of each feeder in real time.

[0064] Step Seven: Closed-Loop Execution and Multi-Level Emergency Response:

[0065] Closed-loop execution: Each feeder adjusts its feeding speed according to the new instructions, changing the aggregate mixing ratio on the aggregate belt 3.

[0066] Coordinated emergency response (monitoring and execution in parallel with optimization processes):

[0067] Level 1 response (single-point exceedance): When image processing identifies a single particle size It automatically marks and triggers repeated sampling verification at that point. An alarm is triggered upon confirmation, and a local shutdown can be configured.

[0068] Level 2 response (continuous anomaly): when continuous Frame (e.g.) All of them appeared The particle size indicates a systemic overdose of coarse aggregate. The system automatically instructs the reduction of the current feed bin ratio while simultaneously increasing the standby bin ratio or switching to a standby production line.

[0069] Level 3 response (persistent deviation): If calculated in step six... continued minutes, such as If the threshold is exceeded and optimization is ineffective, reverse tracing will be initiated, the problematic aggregate bin 1 will be locked and isolation will be recommended, and the material supply source will be switched.

[0070] Step 8: Repeat steps 3 through 7 to form a closed-loop control cycle of sampling, detection, analysis, optimization, and adjustment. The host / system records all image data, particle size distribution, control commands, and response events throughout the process for quality traceability and process optimization.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An aggregate particle size online detection and automatic grading device for precast brick production, which is configured as a dynamic grading regulation system integrating real-time online particle size detection, automatic proportioning of multi-source aggregate, and closed-loop feedback control, characterized in that, The dynamic gradation control system includes: The aggregate storage and feeding module is used to store raw aggregates of different specifications and to meter and feed them. The aggregate storage and feeding module includes multiple aggregate bins (1) arranged side by side, a variable frequency feeder (2) located below the discharge port of each aggregate bin (1), and a collection belt (3) located below the multiple variable frequency feeders (2) for receiving and conveying the aggregates from each aggregate bin (1). An online particle size detection module is configured at the end of the aggregate belt (3) and is used to perform real-time and continuous particle size distribution detection on a single aggregate or aggregate stream before mixing. The online particle size detection module has a sampling unit (4), a detection box (5) and a constant speed conveying channel (6). The detection box (5) is mounted on one side of the aggregate belt (3) via a frame. The detection box (5) is a sealed darkroom structure with a sealed feed inlet at the top, a high-speed industrial camera, an array-type structured light source, and a high-contrast backlight imaging plate inside. The sampling unit (4) is located on the upper side of the aggregate belt (3) and is connected to the sealed feed inlet through a T-shaped negative pressure conveying channel (7). The gradation control host (8) includes a gradation execution unit installed at the drive end of each variable frequency feeder (2) and directly controlling its feeding rate with electrical signals, a data processing unit for receiving signals from the online particle size detection module and calculating the particle size distribution, and a logic control unit embedded with a preset target gradation curve and feedback control algorithm. The logic control unit is electrically connected to the data processing unit and the gradation execution unit and forms a closed-loop control circuit.

2. The device according to claim 1, characterized in that, The sampling unit (4) includes a sampling head (41), a sampling drive (42), a side bracket (43), a disc (44), a rotating rod, a first swing rod (45), a V-shaped connecting rod (46), a second swing rod (47), a first mounting arm (48), and a second mounting arm (49). The side bracket (43) is connected to the side wall of the detection box (5) through a support rod. The side bracket (43) has a long opening in the middle. The first mounting arm (48) and the second mounting arm (49) are respectively hinged to both sides of the long opening of the side bracket (43).

3. The device according to claim 2, characterized in that, The sampling drive (42) is fixed on the bottom side of the side bracket (43), and the shaft end of the sampling drive (42) is connected to the disk (44), and the eccentric side of the end face of the disk (44) is connected to the rotating rod.

4. The device according to claim 2, characterized in that, The first swing rod (45) and the V-shaped connecting rod (46) are both coaxially hinged to the free end of the rotating rod. The V-shaped connecting rod (46) is movably connected to the bottom side of the side bracket (43) in the middle, and the upper end of the V-shaped connecting rod (46) is hinged to the second swing rod (47).

5. The online particle size detection and automatic gradation device for precast brick production according to claim 4, characterized in that, The first swing arm (45) is hinged to the first mounting arm (48) at its end, and the second swing arm (47) is hinged to the second mounting arm (49) at its end. Both the first mounting arm (48) and the second mounting arm (49) are provided with sliding grooves, and multiple sampling heads (41) are installed on the sliding grooves.

6. The online particle size detection and automatic gradation device for precast brick production according to claim 5, characterized in that, The plurality of sampling heads (41) include a vacuum suction head (411), a micro slide (412), an electric cylinder (413) and a back plate (414), wherein the back plate (414) is connected to the slide groove by a nut, the micro slide (412) is provided on the front side of the back plate (414), the electric cylinder (413) is installed on the upper side of the back plate (414), the vacuum suction head (411) is slidably connected to the micro slide (412), and the free end of the electric cylinder (413) is connected to the upper end of the vacuum suction head (411).

7. The online particle size detection and automatic gradation device for precast brick production according to claim 1, characterized in that, The constant speed conveying channel (6) is located in a sealed darkroom structure. The inlet end of the constant speed conveying channel (6) is vertically connected to the lower outlet of the sealed inlet, and its outlet end extends to the center area of ​​the field of view of the high-speed industrial camera.

8. The online particle size detection and automatic gradation device for precast brick production according to claim 7, characterized in that, The constant speed conveying channel (6) is a vibrating conveying chute with material equalization function.

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