Self-adapting target airflow crusher for boron carbide coarse abrasive grains

Abstract

The present application relates to the technical field of boron carbide coarse abrasive particle crushing, and particularly relates to a self-adaptive target airflow crusher for boron carbide coarse abrasive particles, which comprises an air compressor, a Laval nozzle, a feeding distributor, a crusher, a target material, a cyclone collector, a dust collector, an image acquisition assembly, an analysis assembly and a regulation assembly; the analysis assembly determines the accumulation degree of coarse boron carbide powder according to a powder distribution image to adjust the vibration feeding frequency of the feeding distributor, and determines the coarse particle proportion and coarse particle duration according to a powder particle size image and a coarse particle size threshold value; the regulation assembly adjusts the air pressure of high-pressure airflow according to the coarse particle proportion, a preset first proportion, the coarse particle duration, a preset time threshold value and a target particle size, and adjusts the angle of the target material or the air outlet angle of the Laval nozzle according to the impact area position, the impact area proportion and a preset second proportion. The present application effectively improves the qualified rate of boron carbide coarse abrasive particle crushing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boron carbide coarse abrasive particle breaking, and particularly relates to a self-adaptive target airflow breaker for boron carbide coarse abrasive particles. BACKGROUND

[0002] Boron carbide has many excellent performances such as high hardness, strong wear resistance and good chemical stability, and is widely used in ceramics, military and many other industries. For example, in the field of ceramics, micron or even nanometer boron carbide particles after breaking can further improve the hardness and wear resistance of ceramic cutters. In the field of military bulletproof materials, fine boron carbide particles can realize more compact packing arrangement, effectively reduce the internal voids of the material, and more efficiently disperse the impact force.

[0003] In the fields of fine ceramics and semiconductor industry, airflow breakers are often used to crush boron carbide coarse particles. The airflow breakers mainly include: 1) a target airflow breaker, which makes boron carbide coarse particles impact a specially designed target in the main body of the breaker under the push of high-speed airflow to achieve breaking; 2) a head-on airflow breaker, which makes boron carbide coarse particles in a fluidized state on a fluidized bed through airflow, and multiple accelerated high-speed airflows are introduced from different directions to collide with the particles in the fluidized state; and 3) a flat airflow breaker, which makes boron carbide coarse particles in the cavity rotate at high speed under the drive of high-speed airflow and then collide with each other to break. When the existing devices crush boron carbide coarse particles, it is difficult to control the particle size, and over-breaking often occurs, resulting in low qualified product rate and material waste.

[0004] Therefore, there is an urgent need for a self-adaptive target airflow breaker for boron carbide coarse abrasive particles, which can accurately control the particle size and efficiently break, and improve the yield of boron carbide products. SUMMARY

[0005] To this end, the present application provides a self-adaptive target airflow breaker for boron carbide coarse abrasive particles to overcome the problem that it is difficult to control the particle size when the existing device crushes boron carbide coarse particles, resulting in low qualified product rate.

[0006] To achieve the above-mentioned purpose, the present application provides a self-adaptive target airflow breaker for boron carbide coarse abrasive particles, which comprises:

[0007] An air compressor, the output pipeline of which is connected with a Laval nozzle to provide high-pressure airflow for the Laval nozzle, and a pressure regulating valve is arranged on the output pipeline to control the air pressure of the high-pressure airflow entering the breaker;

[0008] The Laval nozzle, the outlet end of which is connected with the breaker to accelerate the high-pressure airflow;

[0009] A feeding distributor, which is arranged in front of the nozzle of the Laval nozzle to uniformly distribute the coarse boron carbide powder on the airflow path.

[0010] A crusher, an inner wall of which is provided with a target material for breaking the coarse boron carbide powder by impacting the target material under the high-pressure airflow after the speed is increased, the target material being connected with an adjusting assembly for adjusting the angle of the target material;

[0011] A cyclone collector connected with the outlet of the crusher for separating the target product and the airflow;

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

[0013] An image acquisition assembly for acquiring the powder distribution image of the coarse boron carbide powder in the crusher and the particle impact image on the target material at a plurality of time points;

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

[0015] An adjusting assembly connected with the analysis assembly for adjusting the air pressure of the high-pressure airflow according to the comparison result of the coarse particle size proportion and a preset first proportion, the comparison result of the coarse particle size duration and a preset time threshold, and the target particle size of the coarse boron carbide powder, and adjusting the angle of the target material or the air outlet angle of the Laval nozzle according to the impact area position, the impact area proportion and a preset second proportion.

[0016] Further, the impact surface of the target material is a concave surface, and the concave surface of the target material is provided with a uniform array of micro-protrusions for increasing the contact collision points between the target material and the coarse boron carbide powder.

[0017] Further, at a single time point, the analysis assembly determines the accumulation area of the coarse boron carbide powder according to the powder distribution image, determines the single accumulation proportion of the coarse boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation proportion.

[0018] Further, the analysis assembly determines the adjustment mode of the vibration feeding frequency according to the accumulation degree and a 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 the preset accumulation degree, the vibration feeding frequency is increased;

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

[0022] Further, the analysis component determines the particle size according to the powder particle size image at a single time point, determines the particle size distribution interval and the corresponding particle number according to the particle size, determines the coarse particle size region according to the particle size distribution interval, the particle number, and the coarse particle size threshold, and determines the coarse particle size proportion according to the coarse particle size region.

[0023] Further, the analysis component determines the particle size crushing change rate of the coarse particle size according to the coarse particle size proportions at a plurality of time points, and determines the coarse particle size duration according to the particle size crushing change rate and a preset rate.

[0024] Further, the regulation component adjusts the air pressure of the high-pressure gas flow, including:

[0025] if the coarse particle size proportion is greater than a preset first proportion and the coarse particle size duration is greater than a preset time threshold, the air pressure of the high-pressure gas flow is increased, and the increase value of the air pressure is determined according to a linear relationship between the original gas flow air pressure and the coarse particle size value and the target particle size.

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

[0027] Further, the regulation component determines the adjustment mode of the target angle and the gas outlet angle according to a comparison result of the impact area proportion and a preset second proportion, including:

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

[0029] Further, the regulation component further determines the angle adjustment amount of the target angle or the gas outlet angle according to the proportion difference between the impact area proportion and the preset second proportion.

[0030] Compared with the prior art, the present application has the beneficial effects that the present application realizes intelligent and accurate control in the whole process through the double feedback mechanism of image acquisition and particle size monitoring. On the one hand, the feeding distributor, the image acquisition assembly and the control assembly form a front-end material precise deployment link, which ensures that the coarse particle boron carbide powder uniformly enters the airflow path, and avoids uneven crushing effect caused by uneven distribution of coarse particle boron carbide powder. On the other hand, the target material, the control assembly and the image acquisition assembly cooperate with each other, dynamically adjust the target material angle according to the particle size in the crushing cavity, simultaneously link the Laval nozzle airflow to adapt to the change of the target material, accurately match the stress of the abrasive particles, greatly improve the crushing precision and efficiency, and improve the product qualification rate.

[0031] Further, the impact surface of the target material is provided as a concave surface, and the surface of the concave target material is provided with a micro-protrusion array, which changes the movement track and rebound direction of the coarse particle boron carbide powder, increases the collision probability between the coarse particle boron carbide powders and between the coarse particle boron carbide powder and the target material, thereby further accurately matching the stress of the abrasive particles, greatly improving the crushing precision and efficiency, and improving the product qualification rate.

[0032] Further, the present application determines the accumulation area of the coarse particle boron carbide powder according to the powder distribution image at a single time point, determines the single accumulation proportion of the coarse particle boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation proportion, thereby facilitating subsequent control of the vibration feeding frequency of the feeding distributor, further accurately matching the stress of the abrasive particles, greatly improving the crushing precision and efficiency, and improving the product qualification rate.

[0033] Further, the present application determines the particle size according to the powder particle size image at a single time point to determine the particle size distribution interval and the corresponding particle quantity, determines the coarse particle size region according to the particle size distribution interval, the particle quantity and the coarse particle size threshold, determines the coarse particle size proportion and the particle size crushing change rate of the coarse particle size according to the coarse particle size region, and determines the coarse particle size duration according to the particle size crushing change rate and the preset rate, thereby further facilitating subsequent adjustment of the high-pressure airflow pressure, further accurately matching the stress of the abrasive particles, greatly improving the crushing precision and efficiency, and improving the product qualification rate.

[0034] Further, the present application determines the impact area and the impact area proportion according to the particle impact image, and then determines the adjustment mode of the target material angle and the outlet angle according to the comparison result of the impact area proportion and the preset second proportion, so as to ensure that the large particle boron carbide powder can be fully dispersed and impacted in the impact area, avoid uneven crushing caused by particle accumulation, thereby further accurately matching the stress of the abrasive particles, improving the uniformity and efficiency of crushing, greatly improving the crushing precision and efficiency, and improving the product qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1The structure schematic diagram of the self-adaptive target airflow crusher for the boron carbide coarse abrasive grain of the embodiment of the present application is shown in the figure.

[0036] Figure 2 The structure schematic diagram of the target material surface of the embodiment of the present application is shown in the figure.

[0037] Figure 3 The step diagram for determining the accumulation degree of the embodiment of the present application is shown in the figure.

[0038] Figure 4 The step diagram for determining the coarse grain size proportion of the embodiment of the present application is shown in the figure.

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

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

[0041] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application.

[0042] It should be noted that in the description of the present application, the terms indicating the direction or position relationship such as "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and is not indicative or suggestive of the device or element having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0044] Please refer to Figure 1 、 Figure 2 shown in the figure, Figure 1 The structure schematic diagram of the self-adaptive target airflow crusher for the boron carbide coarse abrasive grain of the embodiment of the present application is shown in the figure, Figure 2A structure diagram of a target material surface of an embodiment of the present application; specifically, the present application provides a self-adaptive target airflow crusher 3 for boron carbide coarse abrasive grains, characterized in that it comprises:

[0045] An air compressor 1, the output pipeline of which is connected with a Laval nozzle 2 to provide high-pressure airflow for the Laval nozzle 2, and a pressure regulating valve 11 is arranged on the output pipeline to control the air pressure of the high-pressure airflow entering the crusher 3;

[0046] The Laval nozzle 2, the outlet end of which is connected with the crusher 3 to accelerate the high-pressure airflow;

[0047] A feeding distributor 4 arranged in front of the nozzle of the Laval nozzle 2 to uniformly distribute the coarse-grained boron carbide powder on the airflow path;

[0048] The crusher 3, the inner wall of which is provided with a target material 31 to make the coarse-grained boron carbide powder impact the target material 31 to be broken under the pushing of the accelerated high-pressure airflow, and the target material 31 is connected with an adjusting assembly 32 to adjust the angle of the target material;

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

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

[0051] An image acquisition assembly to acquire powder distribution images of the feeding distributor 4 at several time points, and powder particle size images of the coarse-grained boron carbide powder in the crusher 3 and particle impact images on the target material 31 at several time points;

[0052] An analysis assembly connected with the air compressor 1, the feeding distributor 4, and the crusher 3 to determine the accumulation degree of the coarse-grained boron carbide powder according to the powder distribution images, adjust the vibration feeding frequency of the feeding distributor 4 according to the accumulation degree, determine the coarse particle size proportion of the coarse-grained boron carbide powder according to the powder particle size images and a coarse particle size threshold, determine the coarse particle size duration according to the coarse particle size proportion, and determine the impact area proportion of the coarse-grained boron carbide powder according to the particle impact images;

[0053] A regulation assembly connected with the analysis assembly to adjust the air pressure of the high-pressure airflow according to the comparison result of the coarse particle size proportion and a preset first proportion, the comparison result of the coarse particle size duration and a 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 proportion, and a preset second proportion.

[0054] It can be understood that the air compressor 1 is connected with the Laval nozzle 2 and controls the high-pressure airflow entering the crusher 3 through the pressure regulating valve 11 to provide a stable and suitable power source for crushing and ensure that the crushing degree is controllable; the Laval nozzle 2 accelerates the high-pressure airflow, so that the coarse particle boron carbide powder is propelled to the target material 31 in the crusher 3 under the high-speed airflow, and the target material angle can be adjusted according to the actual demand to change the powder impact angle flexibly and optimize the crushing effect. The feed distributor 4 uniformly distributes the powder on the airflow path to ensure that the powder is uniformly distributed when entering the crusher 3, avoiding uneven force leading to crushing differences. At the same time, the image acquisition assembly collects images of the feed, the crushing process and the target material 31 impact at multiple key time points, real-time monitors the powder dispersion and crushing effect, provides a basis for the control assembly to dynamically adjust the air pressure, the target material angle or the Laval nozzle 2 outlet angle, and ensures that the coarse particle boron carbide powder is not over-crushed during crushing, which causes low product qualification rate and material waste.

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

[0056] In one specific embodiment, the mediation assembly 32 can be mechanical adjustment, which is composed of a connecting rod, a rotating shaft and a motor. The target material is installed 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 the implementation, the composition of the mediation assembly 32 can be determined according to the actual situation, which is not limited here and will not be repeated.

[0057] The present application realizes intelligent and accurate control in the whole process through the double feedback mechanism of image acquisition and particle size monitoring. On the one hand, the feeding distributor 4, the image acquisition assembly and the control assembly form a front-end material precise deployment link, which ensures that the coarse particle boron carbide powder uniformly enters the airflow path, and avoids uneven crushing effect caused by uneven distribution of coarse particle boron carbide powder. On the other hand, the target material 31, the control assembly and the image acquisition assembly cooperate with each other, dynamically adjust the target material angle according to the particle size in the crushing cavity, and simultaneously link the Laval nozzle airflow to adapt to the change of the target material 31, accurately match the stress of the abrasive particles, greatly improve the crushing precision and efficiency, and improve the product qualification rate.

[0058] Specifically, the impact surface of the target material 31 is a concave surface, and the concave surface of the target material 31 is provided with a uniform distribution of micro-protrusion arrays to increase the contact collision points between the target material 31 and the coarse particle boron carbide powder.

[0059] It can be understood that when the coarse particle boron carbide powder impacts the concave surface of the target material 31, the micro-protrusion array increases the contact collision points, so that the stress of the coarse particle boron carbide powder is 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 particle boron carbide powder, promotes the coarse particle boron carbide powder to collide multiple times, prolongs the crushing time, and further improves the particle size uniformity.

[0060] In a specific embodiment, the height of the protrusions in the micro-protrusion array is in the range of 0.5-2mm, and the protrusion spacing is in the range of 3-5mm. Preferably, the height of the protrusions in the micro-protrusion array is 1.2mm, and the protrusion spacing is 4mm. In the implementation, the value range and preferred value of the height of the protrusions and the protrusion spacing in the micro-protrusion array can be determined according to the actual situation, which is not limited here and will not be described again.

[0061] In another specific embodiment, the impact surface of the target material 31 is a concave surface, and the surface of the target material 31 is provided with a texture guide. It can be understood that the texture with a guide, such as a spiral or radial texture, can be created on the surface of the target material 31 to guide the movement trajectory of the coarse particle boron carbide powder after impacting the concave surface, so that it flows and collides in the concave surface along the predetermined path. For example, the spiral texture promotes the spiral motion of the particles in the concave surface, increases the collision probability between the coarse particle boron carbide powders and between the coarse particle boron carbide powders and the target material 31, and realizes 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 effect.

[0062] The present application 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 changes the movement track and rebound direction of the coarse-grained boron carbide powder, increases the collision probability between the coarse-grained boron carbide powder and the target material 31, and further accurately matches the stress of the abrasive particles, greatly improves the breaking precision and efficiency, and improves the product qualification rate.

[0063] Please refer to Figure 3 As shown in the figure, it is a step diagram for determining the accumulation degree of the embodiment of the present application. 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 proportion of the coarse-grained boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation proportion.

[0064] It can be understood that the powder distribution image at a single time point reflects the distribution of the coarse-grained boron carbide powder in the feeder distributor 4. The accumulation and accumulation area of the coarse-grained boron carbide powder can be determined through the powder distribution image. The larger the accumulation area, the larger the single accumulation proportion, 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 gray-scale image. In the gray-scale image, white pixel points represent the background, and black areas are coarse-grained boron carbide powder. Through image recognition algorithm processing, the accumulation area of the coarse-grained boron carbide powder can be determined. The single accumulation proportion is the ratio of the accumulation area to the powder distribution image area in the powder distribution image at a single time point. The accumulation degree is the average of the single accumulation proportions corresponding to a plurality of powder distribution images. The higher the single accumulation proportion, the higher the accumulation degree. In the implementation, the method for determining the accumulation area of the powder distribution image, the single accumulation proportion, and the accumulation degree can be determined according to actual conditions, which is not specifically limited here and will not be described again.

[0066] Specifically, the analysis component determines the adjustment mode 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 the preset accumulation degree, the vibration feeding frequency is increased;

[0069] Wherein, the increase amount of the vibration feeding frequency is determined according to the accumulation degree, the preset accumulation degree, and the original vibration feeding frequency.

[0070] It can be understood that if the accumulation degree is less than the preset accumulation degree, it indicates that the accumulation of the coarse granular boron carbide powder in the spreading area of the feeding spreader 4 is not serious, the accumulation area is small, and the vibration feeding frequency of the feeding spreader 4 does not need to be adjusted; if the accumulation degree is greater than or equal to the preset accumulation degree, it indicates that the current accumulation is already serious, which will affect the production efficiency and the crushing quality of the coarse granular boron carbide powder, at this time, the vibration feeding frequency is increased to promote the flow and dispersion of the coarse granular boron carbide powder.

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

[0072] The present application determines the accumulation area of the coarse granular boron carbide powder according to the powder distribution image at a single time point, determines the single accumulation ratio of the coarse granular 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 feeding spreader 4, further accurately matching the stress of the abrasive particles, greatly improving the crushing precision and efficiency, and improving the product qualification rate.

[0073] Please refer to Figure 4 As shown in the drawing, it is a step diagram for determining the coarse granularity proportion of the embodiment of the present application, 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 interval and the corresponding particle number according to the particle size, determines the coarse granularity area according to the particle size distribution interval, the particle number and the coarse granularity threshold, and determines the coarse granularity proportion according to the coarse granularity area.

[0074] It can be understood that at a single time point, the particle size of each particle is identified by processing the image with image analysis software. The particle size of the boron carbide powder can be determined by measuring the pixel size of the boron carbide powder in the powder particle size image, and the conversion relationship between the powder particle size image and the actual image shooting area, the pixel size and the actual size, so as to obtain a series of boron carbide particles with different particle sizes. According to the particle size distribution interval and the corresponding particle number, the particle size distribution interval is segmented according to the coarse particle size threshold value. The particles greater than or equal to the coarse particle size threshold value in the particle size distribution interval are identified as coarse particles, and the region where the coarse particles are located is the coarse particle size region. Therefore, the coarse particle size ratio is the ratio of the area of the coarse particle size region in the powder particle size image to the area of the powder particle size image. The value range of the coarse particle size threshold value is 2-3 μm, and preferably the value of the coarse particle size threshold value is 2.8 μm. In the implementation, the way of confirming the powder particle size image and the value range and preferably the value of the coarse particle size threshold value can be determined according to the actual situation, which is not limited here and will not be described again.

[0075] Specifically, the analysis component determines the particle size crushing change rate of coarse particles according to the coarse particle size ratio at several time points, and determines the coarse particle duration according to the particle size crushing change rate and the preset rate.

[0076] It can be understood that the coarse particle duration is the time when the particle size crushing change rate is lower than the preset rate.

[0077] In a specific embodiment, the particle size crushing change rate of coarse particles is the ratio of the coarse particle size ratio at adjacent time points to the time interval of the time points, and the value range of the preset rate is 50 μm / s-100 μm / s, and preferably the value of the preset rate is 80 μm / s. In the implementation, the value range and preferably the value of the preset rate can be determined according to the actual situation, which is not limited here and will not be described again.

[0078] Specifically, the regulation component adjusts the air pressure of the high-pressure gas flow, including:

[0079] If the coarse particle size ratio is greater than the preset first ratio and the coarse particle duration is greater than the preset time threshold, the air pressure of the high-pressure gas flow is increased, and the increase value of the air pressure is determined according to the linear relationship between the original gas flow air pressure and the coarse particle size value and the target particle size.

[0080] It can be understood that when coarse boron carbide powder persists, the particle size change does not conform to the expected crushing process, and the coarse particle ratio is too high, it means that the pressure of the high-pressure gas flow is too low, which is not enough to meet the crushing conditions of the coarse boron carbide powder after contacting with the target material 31. Therefore, the pressure of the high-pressure gas flow is increased to ensure efficient crushing and meet the needs of fine processing of boron carbide.

[0081] In a specific embodiment, the original gas flow pressure ranges from 0.6 to 1.2 MPa, preferably, the original gas flow pressure is 0.8 MPa. A linear relationship between the original gas flow pressure and the coarse particle size value can be obtained through several tests. According to the linear relationship and the target particle size, the pressure of the adjusted high-pressure gas flow can be determined, and then the increase value of the pressure is determined.

[0082] The present application determines the particle size according to the powder particle size image at a single time point to determine the particle size distribution interval and the corresponding particle number, determines the coarse particle size region according to the particle size distribution interval, the particle number and the coarse particle size threshold, determines the coarse particle size proportion and the particle size crushing change rate of the coarse particle size according to the coarse particle size region, and determines the coarse particle size duration according to the particle size crushing change rate and the preset rate, so that the subsequent adjustment of the high-pressure gas flow pressure is further facilitated, the stress on the abrasive particles is further accurately matched, the crushing precision and efficiency are greatly improved, and the product qualification rate is improved.

[0083] Specifically, the analysis component determines the impact area of the coarse particle boron carbide powder according to the particle impact image, and determines the impact area proportion 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 particle boron carbide powder impacts the target 31. The impact area proportion reflects the distribution degree of the coarse particle boron carbide powder impacting the target 31. The impact area of the coarse particle boron carbide powder is determined by image processing and analysis of the particle impact image, such as edge detection, shape matching, etc., to determine the specific position and range of the powder particle impacting the target 31. The impact area proportion is the ratio of the impact area to the target area. In implementation, the specific way of determining the impact area of the coarse particle boron carbide powder can be determined according to actual conditions, which is not limited here and will not be described again.

[0085] Specifically, the control component determines the adjustment mode of the target angle and the gas outlet angle according to the comparison result of the impact area proportion and the preset second proportion, including:

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

[0087] Specifically, the control component further determines the angle adjustment amount of the target angle or the gas outlet angle according to the proportion difference between the impact area proportion and the preset second proportion.

[0088] It can be understood that the impact area ratio reflects the proportion of the area where the coarse granular boron carbide powder impacts 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 indicates that the area where the coarse granular boron carbide powder impacts the target 31 is relatively biased, and the ideal concentration degree is not reached. At this time, it is necessary to adjust the target angle or the gas outlet angle to optimize. For example, if the coarse granular boron carbide powder mostly impacts the upper left corner of the target 31, it indicates that the direction in which the gas flow carrying the coarse granular boron carbide powder hits the target 31 is biased to the upper left. Therefore, the target angle should be shifted to the lower right, or the gas outlet angle of the Laval nozzle 2 should be adjusted to guide the gas flow to the lower right, so that the subsequent powder particles impact the area closer to the target 31.

[0089] In a specific embodiment, if the impact area ratio is less than the preset second ratio, the target angle or the gas outlet angle is accurately controlled according to the actual impact situation, the direction of the target 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 direction of the target angle or the gas outlet angle is determined. The direction of the target 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 gas outlet angle is determined according to the ratio 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. When the ratio difference is less than 10%, the angle adjustment amount is in the range of 5°-8°. When the ratio difference is greater than 10% and less than 25%, the angle adjustment amount is in the range of 20°-30°. And so on. In the implementation, the angle adjustment amount can be determined according to the actual situation. As long as the angle adjustment amount is proportional to the ratio difference, the larger the ratio difference, the larger the angle adjustment amount. Here, it is not specifically limited, and will not be described again.

[0091] The present application determines the impact area and the impact area ratio according to the particle impact image, and then determines the adjustment method of the target 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 fully disperse and impact in the impact area, avoid particle accumulation to cause uneven fragmentation, and further accurately match the stress of abrasive particles, improve the uniformity and efficiency of fragmentation, greatly improve the fragmentation precision and efficiency, and improve the product qualification rate.

[0092] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application. The technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. An adaptive target airflow disrupter for boron carbide coarse grits, characterized by, The application relates to a boron carbide production system, comprising: an air compressor, an output pipeline of which is connected with a Laval nozzle to provide high-pressure airflow for the Laval nozzle, and a pressure regulating valve is arranged on the output pipeline to control the air pressure of the high-pressure airflow entering a crusher; the Laval nozzle, an outlet end of which is connected with the crusher to accelerate the high-pressure airflow; a feed distributor arranged in front of a nozzle of the Laval nozzle to uniformly distribute coarse-grained boron carbide powder on an airflow path; the crusher, an inner wall of which is provided with a target material to make the coarse-grained boron carbide powder impact the target material to be broken under the pushing of the accelerated high-pressure airflow, and the target material is connected with an adjusting assembly to adjust the angle of the target material; a cyclone collector connected with an outlet of the crusher to separate the target product and airflow; a dust collector connected with an air outlet of the cyclone collector to purify the airflow; an image acquisition assembly to acquire powder distribution images of the feed distributor at a plurality of time points, and to acquire powder particle size images of the coarse-grained boron carbide powder in the crusher and particle impact images on the target material at a plurality of time points; an analysis assembly connected with the air compressor, the feed distributor and the crusher to determine the accumulation degree of the coarse-grained boron carbide powder according to the powder distribution images, to adjust the vibration feeding frequency of the feed distributor according to the accumulation degree, to determine the coarse particle size proportion of the coarse-grained boron carbide powder according to the powder particle size images and a coarse particle size threshold, to determine a coarse particle size duration according to the coarse particle size proportion, and to determine the impact area proportion of the coarse-grained boron carbide powder according to the particle impact images; a regulation assembly connected with the analysis assembly to adjust the air pressure of the high-pressure airflow according to the comparison result of the coarse particle size proportion and a preset first proportion, the comparison result of the coarse particle size duration and a preset time threshold, and the target particle size of the coarse-grained boron carbide powder, and to adjust the angle of the target material or the air outlet angle of the Laval nozzle according to the impact area position, the impact area proportion and a preset second proportion.

2. The self-adapting target-type airflow disrupter 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 the concave target material surface is provided with a uniform array of micro-protrusions to increase the contact collision points of the target material and the coarse-grained boron carbide powder.

3. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 1, characterized in that, At a single time point, the analysis assembly determines the accumulation area of the coarse-grained boron carbide powder according to the powder distribution images, determines the single accumulation proportion of the coarse-grained boron carbide powder according to the accumulation area, and determines the accumulation degree according to the single accumulation proportion.

4. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 3, characterized in that The analysis assembly determines the adjustment mode of the vibration feeding frequency according to the accumulation degree and a preset accumulation degree, comprising: 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 the preset accumulation degree, the vibration feeding frequency is increased; wherein the increase amount of the vibration feeding frequency is determined according to the accumulation degree, the preset accumulation degree and the original vibration feeding frequency.

5. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 4, characterized in that The analysis component determines particle sizes from the powder particle size image, determines particle size distribution intervals and corresponding particle numbers from the particle sizes, determines coarse particle size regions from the particle size distribution intervals, particle numbers, and a coarse particle size threshold, and determines a coarse particle size proportion from the coarse particle size regions.

6. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 5, characterized in that The analysis component determines a particle size breakage change rate of the coarse particles from the coarse particle size proportions at different time points, and determines the coarse particle duration from the particle size breakage change rate and a preset rate.

7. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 6, characterized in that The regulation component adjusts the air pressure of the high-pressure airflow, including: If the coarse particle proportion is greater than a preset first proportion and the coarse particle duration is greater than a preset time threshold, the air pressure of the high-pressure airflow is increased, and the increase value of the air pressure is determined according to a linear relationship between the original airflow air pressure and the coarse particle value and the target particle size.

8. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 1, characterized in that, The analysis component determines an impact area of the coarse particle boron carbide powder from the particle impact image, and determines an impact area proportion from the impact area and a target material area.

9. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 8, characterized in that The regulation component determines an adjustment mode of the target material angle and the air outlet angle according to a comparison result of the impact area proportion and a preset second proportion, including: If the impact area proportion is less than the preset second proportion, the offset direction of the target material angle or the air outlet angle is determined according to the impact area position.

10. The self-adapting target-type airflow disrupter for coarse boron carbide abrasive particles according to claim 9, characterized in that The regulation component is further configured to determine an angle adjustment amount of the target material angle or the air outlet angle according to a proportion difference between the impact area proportion and the preset second proportion.

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