Self-adaptive target type airflow crusher for boron carbide coarse abrasive particles

Abstract

The invention relates to the technical field of boron carbide coarse abrasive particle crushing, in particular to a self-adaptive target type airflow crusher for boron carbide coarse abrasive particles, which comprises an air compressor, a Laval nozzle, a feed distributor, a crusher, a target material, a cyclone collector, a dust remover, an image acquisition assembly, an analysis assembly and a regulation and control assembly, the analysis assembly determines the accumulation degree of the coarse-particle boron carbide powder according to the powder distribution image so as to adjust the vibration feeding frequency of the feeding distributor, and determines the coarse-particle ratio and the coarse-particle duration according to the powder particle size image and the coarse-particle threshold value; and the regulation and control assembly adjusts the air pressure of the high-pressure airflow according to the coarseness ratio, the preset first ratio, the coarseness duration time, the preset time threshold value and the target granularity, and adjusts the angle of the target material or the air outlet angle of the Laval nozzle according to the position of the impact area, the ratio of the impact area and the preset second ratio. According to the method, the qualified rate of crushing of the boron carbide coarse abrasive particles is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of boron carbide coarse abrasive particle crushing, in particular to an adaptive target type air flow crusher for boron carbide coarse abrasive particles. Background Art

[0002] Boron carbide has many excellent properties such as high hardness, strong wear resistance, and good chemical stability. It is widely used in many industries such as ceramics and military industry. For example, in the field of ceramics, when the crushed micron-level or even nano-level boron carbide particles are used to prepare ceramic cutting tools, the hardness and wear resistance of the cutting tools can be further improved. In the field of military bulletproof materials, fine boron carbide particles can achieve a tighter stacking arrangement, effectively reduce the gaps inside the material, and disperse the impact force more efficiently.

[0003] In the fields of fine ceramics and semiconductor industry, air flow crushers are often used to crush coarse boron carbide particles. Air flow crushers mainly include: 1) target air flow crusher, which makes coarse boron carbide particles collide with special target materials in the crusher body under the impetus of high-speed air flow to achieve crushing; 2) collision air flow crusher, which makes coarse boron carbide particles in a fluidized state on the fluidized bed through air flow, and at the same time, multiple accelerated high-speed air flows are introduced from different directions to collide with fluidized particles; 3) flat air flow crusher, which makes coarse boron carbide particles in the cavity rotate at high speed under the drive of high-speed air flow and then collide and crush each other. When existing devices grind coarse boron carbide abrasive particles, it is difficult to control the particle size, and over-crushing often occurs, resulting in low qualified rate of finished products and waste of materials.

[0004] Therefore, there is an urgent need for an adaptive target air flow crusher for coarse boron carbide abrasive particles, which can accurately control the particle size and efficiently crush them, thereby improving the yield of boron carbide. Summary of the invention

[0005] To this end, the present invention provides an adaptive target airflow crusher for boron carbide coarse abrasive particles, which is used to overcome the problem in the prior art that it is difficult to control the particle size when the device grinds the boron carbide coarse abrasive particles, resulting in a low qualified rate of finished products.

[0006] To achieve the above object, the present invention provides an adaptive target air flow crusher for coarse boron carbide abrasive particles, comprising:

[0007] An air compressor, whose output pipeline is connected to the Laval nozzle to provide a high-pressure airflow to the Laval nozzle, and a pressure regulating valve is provided on the output pipeline to control the air pressure of the high-pressure airflow entering the crusher;

[0008] A Laval nozzle, the outlet end of which is connected to the crusher to increase the speed of the high-pressure airflow;

[0009] A feed distributor, which is arranged at the front side of the nozzle of the Laval nozzle and is used to evenly distribute the coarse boron carbide powder on the air flow path;

[0010] A crusher, a target material is arranged on one side of the inner wall thereof, so that the coarse boron carbide powder is driven by the accelerated high-pressure airflow to collide with the target material and crush to obtain a target finished product, and the target material is connected to an adjustment component, and the adjustment component is used to adjust the angle of the target material;

[0011] A cyclone collector connected to the outlet of the crusher to separate the target finished product and the airflow;

[0012] A dust collector connected to the air outlet of the cyclone collector for purifying the airflow;

[0013] An image acquisition component, which is used to acquire powder distribution images in the feed distributor at several time points, and to acquire powder particle size images of coarse boron carbide powder in the crusher and particle impact images on the target material at several time points;

[0014] an analysis component connected to the air compressor, the feed distributor and the crusher, for determining the stacking degree of the coarse-grained boron carbide powder according to the powder distribution image, adjusting the vibration feeding frequency of the feed distributor according to the stacking degree, determining the coarse-grained proportion of the coarse-grained boron carbide powder according to the powder particle size image and the coarse-grained threshold, determining the coarse-grained duration according to the coarse-grained proportion, and determining the impact area proportion of the coarse-grained boron carbide powder according to the particle impact image;

[0015] A control component is connected to the analysis component, and is used to adjust the air pressure of the high-pressure airflow according to the comparison result of the coarse-grainedness ratio and the preset first ratio, the comparison result of the coarse-grainedness duration and the preset time threshold, and the target particle size of the coarse-grained boron carbide powder, and adjust the target material angle or the outlet angle of the Laval nozzle according to the impact area position, the impact area ratio and the preset second ratio.

[0016] Furthermore, the impact surface of the target material is a concave surface, and a uniformly distributed micro-protrusion array is arranged on the surface of the concave target material to increase the contact and collision points between the target material and the coarse-grained boron carbide powder.

[0017] Furthermore, at a single time point, the analysis component determines the accumulation area of ​​the coarse-grained boron carbide powder according to the powder distribution image, determines a single accumulation ratio of the coarse-grained boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation ratio.

[0018] Further, the analysis component determines the adjustment method of the vibration feeding frequency according to the accumulation degree and the preset accumulation degree, including:

[0019] If the accumulation degree is less than the preset accumulation degree, the vibration feeding frequency is not adjusted;

[0020] If the accumulation degree is greater than or equal to a preset accumulation degree, increasing the vibration feeding frequency;

[0021] The analysis component determines the increase in the vibration feeding frequency according to the accumulation degree, the preset accumulation degree and the original vibration feeding frequency.

[0022] Furthermore, at a single time point, the analysis component determines the particle size based on the powder particle size image, determines the particle size distribution range and the corresponding number of particles based on the particle size, determines the coarse-grained area based on the particle size distribution range, the number of particles and the coarse-grained threshold, and determines the coarse-grained proportion based on the coarse-grained area.

[0023] Furthermore, the analysis component determines the coarse-grained particle size crushing change rate according to the coarse-grained particle size proportion at several time points, and determines the coarse-grained particle size duration according to the particle size crushing change rate and a preset rate.

[0024] Furthermore, the regulating component adjusts the air pressure of the high-pressure airflow, including:

[0025] If the coarse-grained proportion is greater than the preset first proportion and the coarse-grained duration is greater than the preset time threshold, the air pressure of the high-pressure airflow is increased, and the increase in air pressure is determined according to the linear relationship between the original airflow pressure and the coarse-grained value and the target granularity.

[0026] Furthermore, the analysis component determines the impact area of ​​the coarse boron carbide powder according to the particle impact image, and determines the impact area ratio according to the impact area and the target area.

[0027] Furthermore, the regulating component determines the adjustment method of the target material angle and the gas outlet angle according to the comparison result of the impact area ratio and the preset second ratio, including:

[0028] If the impact area ratio is less than the preset second ratio, the offset direction of the target material angle or the gas outlet angle is determined according to the position of the impact area.

[0029] Furthermore, the regulating component also determines the angle adjustment amount of the target angle or the gas outlet angle according to the difference between the impact area ratio and the preset second ratio.

[0030] Compared with the prior art, the beneficial effect of the present invention is that the present invention realizes intelligent and precise control of the whole process through the dual feedback mechanism of image acquisition and particle size monitoring. On the one hand, the feed spreader, image acquisition component and control component form a precise front-end material allocation link to ensure that the coarse-grained boron carbide powder enters the airflow path evenly, avoiding uneven crushing effects caused by uneven distribution of coarse-grained boron carbide powder. On the other hand, the target material, control component and image acquisition component cooperate with each other to dynamically adjust the target material angle according to the particle size in the crushing chamber, and at the same time link the Laval nozzle airflow to adapt to the target material changes, accurately match the abrasive force, greatly improve the crushing accuracy and efficiency, and improve the product qualification rate.

[0031] Furthermore, the present invention sets the impact surface of the target material to a concave surface, and the surface of the concave target material is provided with a micro-protrusion array, which causes the movement trajectory and rebound direction of the coarse-grained boron carbide powder to change, increases the collision probability between the coarse-grained boron carbide powder and between the coarse-grained boron carbide powder and the target material, thereby further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0032] Furthermore, at a single time point, the present invention determines the accumulation area of ​​the coarse-grained boron carbide powder according to the powder distribution image, determines the single accumulation ratio of the coarse-grained boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation ratio, thereby facilitating the subsequent control of the vibration feeding frequency of the feed spreader, further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0033] Furthermore, at a single time point, the present invention determines the particle size according to the powder particle size image to determine the particle size distribution range and the corresponding particle number, determines the coarse-grained area according to the particle size distribution range, the particle number and the coarse-grained threshold, determines the coarse-grained proportion according to the coarse-grained area and determines the coarse-grained particle size crushing change rate, determines the coarse-grained duration according to the particle size crushing change rate and a preset rate, thereby further facilitating the subsequent adjustment of the high-pressure airflow pressure, further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0034] Furthermore, the present invention determines the impact area and the impact area ratio according to the particle impact image, and then determines the adjustment method of the target material angle and the gas outlet angle according to the comparison result of the impact area ratio and the preset second ratio, to ensure that large-particle boron carbide powder can be fully dispersed and collided in the impact area, avoiding uneven crushing caused by particle accumulation, thereby further accurately matching the abrasive force, improving the uniformity and efficiency of crushing, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1This is a schematic structural diagram of an adaptive target-type airflow crusher for coarse boron carbide abrasive particles according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the target surface according to an embodiment of the present invention;

[0037] Figure 3 A diagram showing a step of determining a stacking degree according to an embodiment of the present invention;

[0038] Figure 4 A diagram showing the steps of determining the coarse-grained ratio according to an embodiment of the present invention;

[0039] In the figure: 1, air compressor; 11, pressure regulating valve; 2, Laval nozzle; 3, crusher; 31, target material; 32, regulating component; 4, feed spreader; 5, cyclone collector; 6, dust collector. DETAILED DESCRIPTION

[0040] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0042] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0043] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] See also Figure 1 , Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of an adaptive target airflow crusher for coarse boron carbide abrasive particles according to an embodiment of the present invention. Figure 2Schematic diagram of the structure of the target surface of an embodiment of the present invention; specifically, the present invention provides an adaptive target-type airflow crusher 3 for coarse boron carbide abrasive particles, characterized in that it includes:

[0045] An air compressor 1, whose output pipe is connected to the Laval nozzle 2, is used to provide a high-pressure airflow to the Laval nozzle 2, and a pressure regulating valve 11 is provided on the output pipe to control the air pressure of the high-pressure airflow entering the crusher 3;

[0046] A Laval nozzle 2, whose outlet end is connected to a crusher 3, for increasing the speed of the high-pressure airflow;

[0047] A feed spreader 4, which is arranged at the front side of the nozzle of the Laval nozzle 2, and is used to evenly spread the coarse boron carbide powder on the air flow path;

[0048] A crusher 3, on one side of which an inner wall is provided with a target material 31, so that the coarse boron carbide powder can be driven by the accelerated high-pressure airflow to collide with the target material 31 and be crushed to obtain a target product. The target material 31 is connected to an adjustment component 32, and the adjustment component 32 is used to adjust the angle of the target material;

[0049] A cyclone collector 5 connected to the outlet of the crusher 3 to separate the target finished product and the airflow;

[0050] A dust collector 6 connected to the air outlet of the cyclone collector 5 for purifying the airflow;

[0051] An image acquisition component, which is used to acquire the powder distribution image in the feed distributor 4 at a certain time point, and to acquire the powder particle size image of the coarse boron carbide powder in the crusher 3 and the particle impact image on the target material 31 at a certain time point;

[0052] An analysis component connected to the air compressor 1, the feed distributor 4 and the crusher 3, for determining the stacking degree of the coarse-grained boron carbide powder according to the powder distribution image, adjusting the vibration feeding frequency of the feed distributor 4 according to the stacking degree, and determining the coarse-grained proportion of the coarse-grained boron carbide powder according to the powder particle size image and the coarse-grained threshold, determining the coarse-grained duration according to the coarse-grained proportion, and determining the impact area proportion of the coarse-grained boron carbide powder according to the particle impact image;

[0053] A control component is connected to the analysis component, and is used to adjust the air pressure of the high-pressure airflow according to the comparison result of the coarse-grainedness ratio and the preset first ratio, the comparison result of the coarse-grainedness duration and the preset time threshold, and the target particle size of the coarse-grained boron carbide powder, and adjust the target material angle or the air outlet angle of the Laval nozzle 2 according to the impact area position, the impact area ratio and the preset second ratio.

[0054] It is understandable that the air compressor 1 is connected to the Laval nozzle 2 and accurately controls the high-pressure airflow pressure entering the crusher 3 through the pressure regulating valve 11, providing a stable and suitable power source for crushing, ensuring that the crushing force is controllable; the Laval nozzle 2 increases the speed of the high-pressure airflow, so that the coarse-grained boron carbide powder rushes towards the target 31 in the crusher 3 under the push of the high-speed airflow, and uses the adjustable angle of the target material to flexibly change the powder impact angle according to actual needs to optimize the crushing effect. The feed spreader 4 evenly spreads the powder on the airflow path to ensure that the powder is evenly distributed when entering the crusher 3, avoiding local uneven force causing crushing differences. At the same time, the image acquisition component collects images of the feeding, crushing process and the impact of the target material 31 at multiple key time points, monitors the powder dispersion and crushing effect in real time, and provides a basis for the control component to dynamically adjust the air pressure, target angle or Laval nozzle 2 outlet angle, ensuring that the coarse-grained boron carbide powder will not be over-crushed during crushing, resulting in low qualified rate of finished products and material waste.

[0055] In a specific embodiment, the value range of the preset first proportion is 10% to 20%, preferably, the value of the preset first proportion is 15%; the value range of the preset time threshold is, preferably, the value of the preset time threshold is, the value range of the preset second proportion is 80% to 100%, preferably, the value of the preset second proportion is 90%; the value range of the time interval of the several time points is 1s to 3s, preferably, the value of the time interval of the several time points is 2s. In implementation, the value ranges and preferred values ​​of the preset first proportion, the preset time threshold, the preset second proportion, and the time interval of the several time points can be determined according to actual conditions, and are not specifically limited here, and will not be repeated.

[0056] In a specific embodiment, the adjustment component 32 can be a mechanical adjustment, which is composed of a connecting rod, a rotating shaft and a motor. The target material is mounted on the rotating shaft, and the angle of the target material is changed by rotating the rotating shaft. The motor is used to provide power to drive the connecting rod to move, thereby driving the rotating shaft to rotate. In implementation, the composition of the adjustment component 32 can be determined according to actual conditions, and is not specifically limited here and will not be repeated.

[0057] The present invention realizes intelligent and precise control of the whole process through the dual feedback mechanism of image acquisition and particle size monitoring. On the one hand, the feed spreader 4, the image acquisition component and the control component form a precise front-end material allocation link to ensure that the coarse-grained boron carbide powder evenly enters the airflow path, avoiding uneven crushing effects caused by uneven distribution of coarse-grained boron carbide powder. On the other hand, the target material 31, the control component and the image acquisition component cooperate with each other to dynamically adjust the target material angle according to the particle size in the crushing chamber, and at the same time, the Laval nozzle airflow is linked to adapt to the changes in the target material 31, accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0058] Specifically, the impact surface of the target 31 is a concave surface, and a uniformly distributed micro-protrusion array is arranged on the surface of the concave target 31 to increase the contact and collision points between the target 31 and the coarse-grained boron carbide powder.

[0059] It is understandable that when the coarse boron carbide powder hits the concave surface of the target 31, the micro-protrusion array increases the contact collision points, making the coarse boron carbide powder more dispersed, avoiding uneven crushing caused by local stress concentration. At the same time, the micro-protrusion array changes the rebound direction of the coarse boron carbide powder, prompting the coarse boron carbide powder to collide multiple times, prolonging the crushing time, and thus improving the uniformity of particle size.

[0060] In a specific embodiment, the protrusion height in the micro-protrusion array is in the range of 0.5 to 2 mm, and the protrusion spacing is in the range of 3 to 5 mm. Preferably, the protrusion height in the micro-protrusion array is 1.2 mm, and the protrusion spacing is 4 mm. In implementation, the protrusion height and protrusion spacing in the micro-protrusion array have a range of values ​​and a preferred value that can be determined based on actual conditions. No specific limitation is made here and no further elaboration is given.

[0061] In another specific embodiment, the impact surface of the target 31 is a concave surface, and the surface of the target 31 is provided with a texture guide. It can be understood that creating a guiding texture on the surface of the target 31, such as a spiral or radial texture, can guide the movement trajectory of the coarse-grained boron carbide powder after hitting the concave surface, so that it flows and collides in the concave surface along a predetermined path. For example, the spiral texture prompts the particles to perform spiral motion in the concave surface, increases the collision probability between the coarse-grained boron carbide powder and between the coarse-grained boron carbide powder and the target 31, and achieves a more uniform crushing effect, especially for preventing the accumulation of particles in a certain area of ​​the concave surface and ensuring the uniformity of crushing.

[0062] The present invention sets the impact surface of the target material 31 as a concave surface, and the surface of the target material 31 is provided with a micro-protrusion array, which causes the movement trajectory and rebound direction of the coarse-grained boron carbide powder to change, increases the collision probability between the coarse-grained boron carbide powder and between the coarse-grained boron carbide powder and the target material 31, thereby further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0063] See also Figure 3 As shown, it is a step diagram for determining the degree of accumulation in an embodiment of the present invention. Specifically, at a single time point, the analysis component determines the accumulation area of ​​the coarse-grained boron carbide powder according to the powder distribution image, determines the single accumulation ratio of the coarse-grained boron carbide powder according to the accumulation area, and determines the degree of accumulation according to the single accumulation ratio.

[0064] It can be understood that the powder distribution image at a single time point reflects the distribution of coarse-grained boron carbide powder in the feed distributor 4. The powder distribution image can be used to determine the aggregation and accumulation area of ​​the coarse-grained boron carbide powder. The larger the accumulation area, the larger the single accumulation ratio, and the higher the accumulation degree.

[0065] In a specific embodiment, the coarse-grained boron carbide powder is generally gray-black, so at a single time point, the powder distribution image can be converted into a grayscale image. In the grayscale image, the white pixels represent the background, and the black area is the coarse-grained boron carbide powder. After being processed by the image recognition algorithm, the accumulation area of ​​the coarse-grained boron carbide powder can be determined. The single accumulation ratio is the ratio of the accumulation area area in the powder distribution image at a single time point to the powder distribution image area, and the accumulation degree is the mean of the single accumulation ratio corresponding to several powder distribution images. The higher the single accumulation ratio, the higher the accumulation degree. In implementation, the method for determining the accumulation area of ​​the powder distribution image, the single accumulation ratio, and the accumulation degree can all be determined according to actual conditions, and are not specifically limited here and will not be repeated.

[0066] Specifically, the analysis component determines the adjustment method of the vibration feeding frequency according to the accumulation degree and the preset accumulation degree, including:

[0067] If the accumulation degree is less than the preset accumulation degree, the vibration feeding frequency is not adjusted;

[0068] If the accumulation degree is greater than or equal to a preset accumulation degree, increasing the vibration feeding frequency;

[0069] The increase in the vibration feeding frequency is determined according to the stacking degree, the preset stacking degree and the original vibration feeding frequency.

[0070] It can be understood that if the stacking degree is less than the preset stacking degree, it means that the stacking of coarse-grained boron carbide powder in the spreading area of ​​the feed spreader 4 is not serious, and the stacking area is small, then there is no need to adjust the vibration feeding frequency of the feed spreader 4; if the stacking degree is greater than or equal to the preset stacking degree, it means that the current stacking situation is already serious, which will affect the production efficiency and the crushing quality of the coarse-grained boron carbide powder. At this time, the vibration feeding frequency is increased to promote the flow and dispersion of the coarse-grained boron carbide powder.

[0071] In a specific embodiment, the preset stacking degree has a value range of 10% to 15%, preferably, the preset stacking degree has a value of 12%; the original vibration feeding frequency has a value range of 30Hz to 50Hz, preferably, the original vibration feeding frequency has a value of 40Hz, the increase in vibration feeding frequency is determined according to the stacking degree, the preset stacking degree and the original vibration feeding frequency, the absolute difference between the stacking degree and the preset stacking degree is the first difference, and the increase in vibration feeding frequency is the product of the ratio of the first difference to the preset stacking degree and the original vibration feeding frequency. In implementation, the preset stacking product, the value range and the preferred value of the original vibration feeding frequency can be determined according to actual conditions, and are not specifically limited here and will not be repeated.

[0072] The present invention determines the accumulation area of ​​coarse-grained boron carbide powder according to the powder distribution image at a single time point, determines the single accumulation ratio of the coarse-grained boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation ratio, thereby facilitating the subsequent control of the vibration feeding frequency of the feed spreader 4, further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0073] See also Figure 4 As shown, it is a step diagram for determining the coarse-grainedness ratio in an embodiment of the present invention. Specifically, at a single time point, the analysis component determines the particle size according to the powder particle size image, determines the particle size distribution range and the corresponding number of particles according to the particle size, determines the coarse-grainedness area according to the particle size distribution range, the number of particles and the coarse-grainedness threshold, and determines the coarse-grainedness ratio according to the coarse-grainedness area.

[0074] It is understandable that at a single time point, the image is processed using image analysis software to identify the particle size of each particle. The particle size can be determined by measuring the pixel size of boron carbide powder in the powder particle size image, combining the proportional coefficient between the powder particle size image and the actual image shooting area, the conversion relationship between the pixel size and the actual size, so as to obtain a series of boron carbide particles of different particle sizes, and the particle size distribution interval and the corresponding number of particles are determined according to the particle size. The particle size distribution interval is divided according to the coarse particle size threshold, and the particles greater than or equal to the coarse particle size threshold in the particle size distribution interval are identified as coarse particles, and the area where the coarse particles are located is the coarse particle size area. The coarse particle size ratio is the ratio of the area of ​​the coarse particle size area in the powder particle size image to the area of ​​the powder particle size image. The value range of the coarse particle size threshold is 2 to 3 μm. Preferably, the value of the coarse particle size threshold is 2.8 μm. In implementation, the method of confirming the powder particle size image and the value range and preferred value of the coarse particle size threshold can be determined according to the actual situation, which is not specifically limited here and will not be repeated.

[0075] Specifically, the analysis component determines the coarse-grained particle size crushing change rate according to the coarse-grained particle size proportion at several time points, and determines the coarse-grained particle size duration according to the particle size crushing change rate and a preset rate.

[0076] It can be understood that the coarse-grainedness duration is the time during which the rate of change of the particle size crushing is lower than a preset rate.

[0077] In a specific embodiment, the rate of change of coarse-grained particle size crushing is the ratio of the coarse-grained proportion at adjacent time points to the time interval between the time points. The preset rate has a value range of 50 μm / s to 100 μm / s. Preferably, the preset rate is 80 μm / s. In implementation, the value range and preferred value of the preset rate can be determined based on actual conditions. No specific limitation is made here and no further details are given.

[0078] Specifically, the regulating component adjusts the air pressure of the high-pressure airflow, including:

[0079] If the coarse-grained proportion is greater than the preset first proportion and the coarse-grained duration is greater than the preset time threshold, the air pressure of the high-pressure airflow is increased, and the increase in air pressure is determined according to the linear relationship between the original airflow pressure and the coarse-grained value and the target granularity.

[0080] It can be understood that when coarse-grained boron carbide powder continues to exist, the particle size change does not conform to the expected crushing process, and the proportion of coarse particles is too high, it means that the pressure of the high-pressure airflow is too low and is not enough to achieve the crushing conditions after the coarse-grained boron carbide powder contacts the target material 31. Therefore, the pressure of the high-pressure airflow is increased to ensure that the crushing operation is carried out efficiently and meet the needs of fine processing of boron carbide.

[0081] In a specific embodiment, the value range of the original air flow pressure is 0.6-1.2MPa. Preferably, the value of the original air flow pressure is 0.8MPa. The linear relationship between the original air flow pressure and the coarse particle size value can be obtained based on several experiments. According to the linear relationship and the target particle size, the pressure of the adjusted high-pressure air flow can be determined, and then the increase in pressure can be determined.

[0082] The present invention determines the particle size according to the powder particle size image at a single time point to determine the particle size distribution range and the corresponding particle number, determines the coarse-grained area according to the particle size distribution range, the particle number and the coarse-grained threshold, determines the coarse-grained proportion according to the coarse-grained area and determines the coarse-grained particle size crushing change rate, determines the coarse-grained duration according to the particle size crushing change rate and a preset rate, thereby further facilitating the subsequent adjustment of the high-pressure airflow pressure, further accurately matching the abrasive force, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0083] Specifically, the analysis component determines the impact area of ​​the coarse boron carbide powder according to the particle impact image, and determines the impact area ratio according to the impact area and the target area.

[0084] In a specific embodiment, the target area is the surface area of ​​the concave surface when the coarse-grained boron carbide powder hits the target 31. The impact area ratio reflects the distribution degree of the coarse-grained boron carbide powder hitting the target 31. The impact area of ​​the coarse-grained boron carbide powder is determined by performing image processing analysis on the particle impact image, such as edge detection, shape matching, etc., to determine the specific position and range of the powder particles hitting the target 31. The impact area ratio is the ratio of the impact area area to the target area. In implementation, the specific method of determining the impact area of ​​the coarse-grained boron carbide powder can be determined according to actual conditions, and is not specifically limited here and will not be repeated.

[0085] Specifically, the regulating component determines the adjustment method of the target material angle and the gas outlet angle according to the comparison result of the impact area ratio and the preset second ratio, including:

[0086] If the impact area ratio is less than the preset second ratio, the offset direction of the target material angle or the gas outlet angle is determined according to the position of the impact area.

[0087] Specifically, the regulating component also determines the angle adjustment amount of the target material angle or the gas outlet angle according to the difference between the impact area ratio and the preset second ratio.

[0088] It is understandable that the impact area ratio reflects the proportion of the concentration area of ​​the coarse-grained boron carbide powder impacting the target 31 to the entire target area. If it is found that the impact area ratio is less than the preset second ratio, it means that the area where the coarse-grained boron carbide powder impacts the target 31 is biased and has not reached the ideal concentration level. At this time, it is necessary to adjust the target angle or the air outlet angle to optimize. For example, if the coarse-grained boron carbide powder mostly hits the upper left corner of the target 31, it means that the direction of the airflow carrying the coarse-grained boron carbide powder toward the target 31 is biased to the upper left, so the target angle should be offset to the lower right, or the air outlet angle of the Laval nozzle 2 should be adjusted to guide the airflow to the lower right, so that the subsequent powder particle impact area is closer to the target 31.

[0089] In a specific embodiment, if the impact area ratio is less than the preset second ratio, the target material angle or the gas outlet angle is precisely controlled according to the actual impact situation, and the offset direction of the target material angle or the gas outlet angle is determined according to the impact area position. The impact area position can be determined according to the particle impact image, and then the offset direction of the target material angle or the gas outlet angle is determined. The offset direction of the target material angle and the gas outlet angle is opposite to the direction of the impact area position.

[0090] In a specific embodiment, the angle adjustment amount of the target angle or the air outlet angle is determined according to the difference between the impact area ratio and the preset second ratio. It can be understood that the angle adjustment amount is proportional to the ratio difference. The larger the ratio difference, the larger the angle adjustment amount. The ratio difference is less than 10%, and the angle adjustment amount ranges from 5° to 8°. The ratio difference is greater than 10% and less than 25%, and the angle adjustment amount ranges from 20° to 30°. And so on. In implementation, the angle adjustment amount can be determined according to actual conditions, as long as the angle adjustment amount is proportional to the ratio difference, the larger the ratio difference, the larger the angle adjustment amount. No specific limitation is made here and it will not be repeated.

[0091] The present invention determines the impact area and the impact area ratio according to the particle impact image, and then determines the adjustment method of the target material angle and the gas outlet angle according to the comparison result of the impact area ratio and the preset second ratio, so as to ensure that the large-particle boron carbide powder can be fully dispersed and collided in the impact area, avoid uneven crushing caused by particle accumulation, thereby further accurately matching the abrasive force, improving the uniformity and efficiency of crushing, greatly improving the crushing accuracy and efficiency, and improving the product qualification rate.

[0092] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An adaptive target air flow crusher for coarse boron carbide abrasive particles, characterized in that: include: An air compressor, whose output pipeline is connected to the Laval nozzle to provide a high-pressure airflow to the Laval nozzle, and a pressure regulating valve is provided on the output pipeline to control the air pressure of the high-pressure airflow entering the crusher; A Laval nozzle, the outlet end of which is connected to the crusher to increase the speed of the high-pressure airflow; A feed distributor, which is arranged at the front side of the nozzle of the Laval nozzle and is used to evenly distribute the coarse boron carbide powder on the air flow path; A crusher, a target material is arranged on one side of the inner wall thereof, so that the coarse boron carbide powder is driven by the accelerated high-pressure airflow to collide with the target material and crush to obtain a target finished product, and the target material is connected to an adjustment component, and the adjustment component is used to adjust the angle of the target material; A cyclone collector connected to the outlet of the crusher to separate the target finished product and the airflow; A dust collector connected to the air outlet of the cyclone collector for purifying the airflow; An image acquisition component, which is used to acquire powder distribution images in the feed distributor at several time points, and to acquire powder particle size images of coarse boron carbide powder in the crusher and particle impact images on the target material at several time points; an analysis component connected to the air compressor, the feed distributor and the crusher, for determining the stacking degree of the coarse-grained boron carbide powder according to the powder distribution image, adjusting the vibration feeding frequency of the feed distributor according to the stacking degree, determining the coarse-grained proportion of the coarse-grained boron carbide powder according to the powder particle size image and the coarse-grained threshold, determining the coarse-grained duration according to the coarse-grained proportion, and determining the impact area proportion of the coarse-grained boron carbide powder according to the particle impact image; A control component is connected to the analysis component, and is used to adjust the air pressure of the high-pressure airflow according to the comparison result of the coarse-grainedness ratio and the preset first ratio, the comparison result of the coarse-grainedness duration and the preset time threshold, and the target particle size of the coarse-grained boron carbide powder, and adjust the target material angle or the outlet angle of the Laval nozzle according to the impact area position, the impact area ratio and the preset second ratio.

2. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 1, characterized in that: The impact surface of the target material is a concave surface, and a uniformly distributed micro-protrusion array is arranged on the surface of the concave target material to increase the contact and collision points between the target material and the coarse-grained boron carbide powder.

3. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 1, characterized in that: At a single time point, the analysis component determines the accumulation area of ​​the coarse boron carbide powder according to the powder distribution image, determines a single accumulation ratio of the coarse boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation ratio.

4. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 3, characterized in that: The analysis component determines the adjustment method of the vibration feeding frequency according to the accumulation degree and the preset accumulation degree, including: If the accumulation degree is less than the preset accumulation degree, the vibration feeding frequency is not adjusted; If the accumulation degree is greater than or equal to a preset accumulation degree, increasing the vibration feeding frequency; The increase in the vibration feeding frequency is determined according to the stacking degree, the preset stacking degree and the original vibration feeding frequency.

5. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 4, characterized in that: At a single time point, the analysis component determines the particle size based on the powder particle size image, determines the particle size distribution range and the corresponding particle number based on the particle size, determines the coarse particle area based on the particle size distribution range, the particle number and the coarse particle size threshold, and determines the coarse particle ratio based on the coarse particle area.

6. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 5, characterized in that: The analysis component determines the coarse-grained particle size crushing change rate according to the coarse-grained particle size proportion at several time points, and determines the coarse-grained particle size duration according to the particle size crushing change rate and a preset rate.

7. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 6, characterized in that: The regulating component adjusts the air pressure of the high-pressure airflow, including: If the coarse-grained proportion is greater than the preset first proportion and the coarse-grained duration is greater than the preset time threshold, the air pressure of the high-pressure airflow is increased, and the increase in air pressure is determined according to the linear relationship between the original airflow pressure and the coarse-grained value and the target granularity.

8. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 1, characterized in that: The analysis component determines an impact area of ​​the coarse boron carbide powder according to the particle impact image, and determines a proportion of the impact area according to the impact area and the target area.

9. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 8, characterized in that: The regulating component determines the adjustment method of the target material angle and the gas outlet angle according to the comparison result of the impact area ratio and the preset second ratio, including: If the impact area ratio is less than the preset second ratio, the offset direction of the target material angle or the gas outlet angle is determined according to the position of the impact area.

10. The adaptive target air flow crusher for coarse boron carbide abrasive particles according to claim 9, characterized in that: The regulating component is also used to determine the angle adjustment amount of the target angle or the gas outlet angle according to the difference between the impact area ratio and the preset second ratio.

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