Machine-made sand online detection system

Abstract

The invention relates to a machine-made sand online detection system, and belongs to the technical field of concrete detection, the machine-made sand online detection system comprises a sampling module, a weighing module, a screening and drying module, an image acquisition module and an analysis module, the sampling module is used for taking a machine-made sand sample from a production line and sequentially putting the sample into the weighing module and the screening and drying module; the screening and drying module comprises a dispersing pipe, an air blower, a heating machine and a screening channel, the air blower is used for supplying air pressure in the radial direction of the dispersing pipe, the heating machine is used for heating the dispersing pipe and the air blower, and the screening channel is arranged on the other side, located on the air blower, of the dispersing pipe; the air blower is used for blowing dust in the dispersion pipe into the screening channel, and the air blower is used for being matched with the heating machine to dry a sample in the dispersion pipe; the method has the advantage of being high in efficiency.

Description

Technical Field

[0001] This invention belongs to the field of concrete testing technology, specifically relating to an online testing system for manufactured sand. Background Technology

[0002] Manufactured sand (or aggregate) is the main material used in asphalt mixtures and cement concrete, accounting for more than 75% of the volume and mass of concrete. Its characteristics have an important impact on the rheological properties of concrete, the mechanical properties of hardened concrete, and its durability.

[0003] Particle size and shape are crucial parameters for the quality management of manufactured sand. Existing methods for detecting particle size and shape in manufactured sand require sampling first, followed by particle-by-particle analysis. Furthermore, particle size and shape cannot be detected simultaneously. To address this, Chinese Patent CN207742058U discloses an online testing device for manufactured sand, comprising a control module, a sampling module, a weighing module, a drying module, a sorting module, a dispersion module, an image acquisition and analysis module, and a recovery module. The control module is signal-connected to the sampling, weighing, drying, and sorting modules. After acquiring the manufactured sand sample, the sampling module passes it vertically downwards through the weighing, drying, dispersion, image acquisition and analysis, and recovery modules, automatically measuring the particle size and shape of the returned sample. This online testing device for manufactured sand enables rapid online detection of particle size and shape, promptly reflecting the gradation of manufactured sand in the production line and preventing economic losses caused by substandard particle size.

[0004] However, the above method requires drying before sorting, which is inefficient. Therefore, a more efficient online detection system for manufactured sand is needed. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides an online detection system for manufactured sand, which features high efficiency.

[0006] The objective of this invention can be achieved through the following technical solutions: An online detection system for manufactured sand includes a sampling module, a weighing module, a sieving and drying module, a dispersion module, an image acquisition module, and an analysis module. The sampling module, sieving and drying module, and dispersion module are connected end to end in sequence. The sampling module is used to take manufactured sand samples from the production line and put the samples into the weighing module and the sieving and drying module in sequence. The sieving and drying module includes a dispersion tube, a blower, a heater, and a sieving channel. The blower is used to apply air pressure radially along the dispersion tube. The heater is used to heat the dispersion tube and the blower. The sieving channel is located on the other side of the dispersion tube, opposite to the blower. The blower is used to blow dust from the dispersion tube into the sieving channel. The blower is used in conjunction with heating and drying the sample in the dispersion tube. As a preferred technical solution of the present invention, it further includes a control module, which is electrically connected to the weighing module, the sieving and drying module, the image acquisition module and the analysis module. The weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight and upload the wet weight to the control module. The control module determines whether the wet weight exceeds a threshold and adjusts the power of the heater upward if it exceeds the threshold.

[0007] As a preferred embodiment of the present invention, the weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight M2 and upload M2 to the control module. The control module adjusts the power of the heater to P, where P = M2 / M0 × c, M0 is the pre-input standard weight, and c is a pre-input constant.

[0008] As a preferred embodiment of the present invention, the control module is also electrically connected to a humidity sensor. The humidity sensor is used to test the humidity of the manufactured sand on the production line and upload the data to the control module. The control module determines whether the humidity is higher than a threshold, and if the determination result is yes, the control module adjusts the power of the heater upward.

[0009] As a preferred embodiment of the present invention, the humidity sensor is used to test the humidity S of the manufactured sand on the production line and upload it to the control module. The control module adjusts the power of the heater to P×A1, where A1=S / S0×d, S0 is the pre-input standard humidity, and d is the pre-input constant.

[0010] As a preferred embodiment of the present invention, a collector is provided at the bottom of the dispersion tube, and a weighing module is also provided on the collector. The weighing module on the collector is used to weigh the sieved dust and dried manufactured sand to obtain the sample weight, and to calculate the moisture content based on the wet weight and the sample weight.

[0011] As a preferred embodiment of the present invention, the control module is further configured to acquire the moisture content of several past sample processing times and the humidity data acquired several times, and plot the curves of moisture content and humidity changes over time, respectively. The control module determines whether the difference between the cumulative values ​​of the moisture content and humidity curves over time exceeds the deviation threshold, and adjusts the heating power upward if the determination result is yes.

[0012] As a preferred embodiment of the present invention, it also includes a control panel for inputting the values ​​of d and c.

[0013] The beneficial effects of this invention are as follows: (1) By setting up a sieving and drying module, the manufactured sand is blown in the dispersion tube while being dried by the high temperature generated by the heater. At the same time, when the manufactured sand falls through the blower, the dust with extremely small particle size is blown into the sieving channel set directly opposite the blower, thus separating the dust and the dried manufactured sand. Meanwhile, the blower is used to disperse the manufactured sand with larger particles to be tested, saving the setting of the dispersion module, reducing the structural complexity, reducing the number of operation steps, and improving efficiency. At the same time, compared with the scheme of heating with a heating plate, the manufactured sand is dried during the process of free fall and dispersion, with a larger contact area with the heated air, and less energy is consumed to achieve the same drying effect, thus saving energy. (2) By having the control module determine whether the wet weight exceeds the threshold, and increasing the power consumption of the heater when the wet weight determination result is yes, the power of the heater is increased when the total weight of the manufactured sand to be processed is large and more manufactured sand needs to be dried, so as to ensure that more manufactured sand is dried. When the amount of manufactured sand to be processed is small and the power consumption of the heater is not too high, the power consumption of the heater is reduced to save energy. (3) By setting a humidity sensor to test the humidity of the manufactured sand on the production line, the power consumption of the heater is further adjusted upward when the humidity is high. This ensures the drying effect by increasing the power consumption when the humidity of the manufactured sand is high and reducing the power consumption of the heater when the humidity of the manufactured sand is low and the power consumption of the heater is not too high, thereby reducing energy consumption. Attached Figure Description

[0014] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Explanation of key component symbols: In the diagram: 1. Screening and drying module; 11. Dispersion tube; 12. Blower; 13. Screening channel; 14. Funnel; 2. Image acquisition module; 3. Collector. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0017] Please see Figure 1An online detection system for manufactured sand includes a sampling module, a weighing module, a sieving and drying module, an image acquisition module, and an analysis module. The sampling module is used to take manufactured sand samples from the production line and sequentially put the samples into the weighing module and the sieving and drying module. Specifically, the dispersion tube is a vertically set straight tube with a funnel above it. After the sampling module grabs the manufactured sand sample from the production line, it places the manufactured sand sample on the weighing module to weigh it and obtain the wet weight m2. Then the sampling module puts the manufactured sand sample into the funnel, and the manufactured sand sample falls along the dispersion tube under the action of gravity. The blower is located on the side wall of the middle section of the dispersion tube. The blower blows air in the radial direction of the dispersion tube and is used to apply air pressure to the inside of the dispersion tube along the radial direction. Meanwhile, the heating machine is used to heat the dispersion tube and the blower. When the manufactured sand sample falls along the dispersion tube under the action of gravity, the heating machine evaporates and dries the moisture in it. The screening channel is located on the other side of the blower where the dispersion tube is located. Specifically, the screening channel is also arranged radially parallel to the dispersion tube and is directly opposite the air outlet of the blower. When the manufactured sand falls through the blower, the dust particles with extremely small diameters are blown into the screening channel set directly opposite the blower, thus separating the dust from the dried manufactured sand. At the same time, the blower is used to disperse the manufactured sand with larger particles to be tested, saving the need for a dispersion module, reducing structural complexity, reducing operation steps, and improving efficiency. By setting up a screening and drying module, the manufactured sand is dried in the dispersion tube by blowing air while simultaneously using the high temperature generated by the heater. As the manufactured sand falls and passes through the blower, the extremely small dust particles are blown into the screening channel directly opposite the blower, completing the separation of dust and dried manufactured sand. At the same time, the blower is used to disperse the manufactured sand with larger particles to be tested. This saves the need for a dispersion module, reduces structural complexity, reduces operation steps, and improves efficiency. In addition, compared with the solution of using a heating plate for heating, the manufactured sand dries during the free fall process of dispersion, with a larger contact surface with the heated air, consuming less energy while achieving the same drying effect, thus saving energy. A collector is installed at the bottom of the dispersion tube, and a weighing module is also installed on the collector. The weighing module is used to weigh the sieved dust and dried manufactured sand to obtain the sample weight m1. Meanwhile, a weighing module is also installed in the screening channel to weigh the dust and obtain the dust weight m2. At this point, the water content can be obtained by calculating m0-m1-m2, and thus the moisture content can be obtained. A gap is left between the dispersion tube and the collector. An image acquisition module is installed on one side of the gap. The image acquisition module is used to take pictures of the sample after it has been processed by the sieving and drying module and upload the pictures to the analysis module. After receiving the pictures, the analysis module detects the particle size and particle shape of the sample based on the pictures.

[0018] It also includes a control module, which is electrically connected to the weighing module, the sieving and drying module, the image acquisition module, and the analysis module. The weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight and upload the wet weight to the control module. The control module determines whether the wet weight exceeds the threshold and adjusts the power of the heater upward if it exceeds the threshold. Specifically, the weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight M2 and upload M2 to the control module. The control module adjusts the power of the heater to P, where P = M2 / M0 × c, M0 is the pre-input standard weight, and c is the pre-input constant. By having the control module determine whether the wet weight exceeds a threshold, and increasing the power consumption of the heater when the wet weight determination result is yes, the system can increase the power of the heater when the total weight of the manufactured sand to be processed is large and more manufactured sand needs to be dried, thus ensuring that more manufactured sand is dried. When the amount of manufactured sand to be processed is small and the power consumption of the heater is not too high, the power consumption of the heater is reduced, thus saving energy.

[0019] The control module is also electrically connected to a humidity sensor, which is used to test the humidity of the manufactured sand on the production line and upload the data to the control module. The control module determines whether the humidity is higher than the threshold, and if the result is yes, the control module adjusts the power of the heater upward. Specifically, the humidity sensor includes at least a humidity probe, which periodically extends into the manufactured sand on the production line to monitor the humidity. The humidity sensor is used to test the humidity S of the manufactured sand on the production line and upload it to the control module. The control module adjusts the power of the heater to P×A1, where A1=S / S0×d, S0 is the pre-input standard humidity, and d is the pre-input constant. When the humidity is high, it means that there is more liquid to be evaporated, so power consumption needs to be increased to ensure the drying effect. At this time, the value of A1=S / S0×d is larger, the power target value P×A1 is larger, and the power increase is completed. When the humidity is low, it means that there is less liquid to evaporate, so there is no need to increase the power consumption. At this time, the value of A1=S / S0×d is small, the power target value P×A1 is small, and the power reduction is completed. By setting up a humidity sensor to test the humidity of the manufactured sand on the production line, the power consumption of the heater is further adjusted upwards when the humidity is high. This ensures that the power consumption is increased to guarantee the drying effect when the humidity of the manufactured sand is high, and the power consumption of the heater is reduced when the humidity of the manufactured sand is low and the power consumption of the heater is not too high, thereby reducing energy consumption.

[0020] Specifically, in actual use, the weighing module is affected by a variety of factors that cause errors in the weighing of wet weight. When the error occurs or gradually increases over time, it will affect the adjustment result of the heating machine power according to the weighing. When no error occurs, humidity and moisture content should change synchronously. When humidity increases, the detected moisture content should increase synchronously, and when humidity decreases, the detected moisture content should decrease synchronously. However, when an error occurs, the moisture content detection result will fluctuate over time and will not change synchronously with humidity. To this end, the control module is also used to acquire the moisture content of several past samples and the humidity data acquired several times, and to plot the curves of moisture content and humidity changing over time. The control module determines whether the difference between the cumulative values ​​of the moisture content and humidity curves over time exceeds the deviation threshold, and adjusts the power of the heater upward if the determination result is yes. Specifically, after the control module continuously receives moisture content and humidity S over time, it plots the curves F(t) showing the change in moisture content over time and G(t) showing the change in humidity over time. Then, it calculates J1 and J2, where J1 = J2= , where t0 is the pre-input acquisition time, and the control module pre-inputs the deviation threshold J0; When errors occur, the moisture content measurement results fluctuate over time and do not change synchronously with humidity. The curves F(t) for moisture content and G(t) for humidity change over time have different shapes. J1= J2= The values ​​are different. When the value of |J1-J2| exceeds the deviation threshold J0, it means that the two curves have a large deviation, which may mean that the heating power of the heater is insufficient. To be on the safe side, the heating power of the heater is adjusted upward at this time.

[0021] Furthermore, since this solution detects both moisture content and humidity online, these two readily available data can be directly compared to calculate the cumulative value over time, thereby determining the error, without the need for additional parameter detection.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An online detection system for manufactured sand, characterized in that: It includes a sampling module, a weighing module, a sieving and drying module, an image acquisition module, and an analysis module. The sampling module is used to take manufactured sand samples from the production line and put the samples into the weighing module and the sieving and drying module in sequence. The sieving and drying module includes a dispersion tube, a blower, a heater, and a sieving channel. The blower is used to apply air pressure radially along the dispersion tube. The heater is used to heat the dispersion tube and the blower. The sieving channel is located on the other side of the dispersion tube, opposite to the blower. The blower is used to blow dust from the dispersion tube into the sieving channel. The blower is used in conjunction with heating and drying the sample in the dispersion tube. The weighing module is used to weigh the sample before and after it enters the sieving and drying module. The image acquisition module is used to take pictures of the sample after it has been processed by the sieving and drying module and upload the pictures to the analysis module. The analysis module is used to detect the particle size and particle shape of the sample based on the pictures.

2. The online detection system for manufactured sand according to claim 1, characterized in that: It also includes a control module, which is electrically connected to the weighing module, the sieving and drying module, the image acquisition module, and the analysis module. The weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight and upload the wet weight to the control module. The control module determines whether the wet weight exceeds a threshold and adjusts the power of the heater upward if it exceeds the threshold.

3. The online detection system for manufactured sand according to claim 2, characterized in that: The weighing module is used to weigh the sample before it enters the sieving and drying module to obtain the wet weight M2 and upload M2 to the control module. The control module adjusts the power of the heater to P, where P = M2 / M0 × c, M0 is the pre-input standard weight, and c is a pre-input constant.

4. The online detection system for manufactured sand according to claim 3, characterized in that: The control module is also electrically connected to a humidity sensor, which is used to test the humidity of the manufactured sand on the production line and upload the data to the control module. The control module determines whether the humidity is higher than the threshold, and if the result is yes, the control module adjusts the power of the heater upward.

5. The online detection system for manufactured sand according to claim 4, characterized in that: The humidity sensor is used to test the humidity S of the manufactured sand on the production line and upload it to the control module. The control module adjusts the power of the heater to P×A1, where A1=S / S0×d, S0 is the pre-input standard humidity, and d is the pre-input constant.

6. The online detection system for manufactured sand according to claim 5, characterized in that: A collector is installed at the bottom of the dispersion tube, and a weighing module is also installed on the collector. The weighing module on the collector is used to weigh the sieved dust and dried manufactured sand to obtain the sample weight, and to calculate the moisture content based on the wet weight and the sample weight.

7. The online detection system for manufactured sand according to claim 6, characterized in that: The control module is also used to acquire the moisture content of several past samples and the humidity data acquired several times, and to plot the curves of moisture content and humidity changing over time. The control module determines whether the difference between the cumulative values ​​of the moisture content and humidity curves over time exceeds the deviation threshold, and adjusts the heating power upward if the determination result is yes.

8. The online detection system for manufactured sand according to claim 7, characterized in that: It also includes a control panel for inputting the values ​​of d and c.

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