Analysis Of Impact Crusher’s Crushing Effect And Its Impact On Aggregate Study On The Influence Of Particle Shape

Aggregate particles are mainly crushed by a series of processing techniques with the aid of crushing machinery such as jaw,cone,and impact crushers.They are important basic materials in the construction of roads,mines,and buildings.The shape of aggregate particles depends on the structure of the crushing machinery and the physical characteristics of the processed parent rock.If the proportion of needle-like particles in the aggregate is large,it will affect the internal structure of the asphalt mixture,such as compressive resistance and water stability.The traditional detection of needle-like particles is usually manual detection,which is low in efficiency and is affected by the subjective operation of the inspector.As an emerging technology,digital image processing technology can achieve rapid collection and analysis,improve detection efficiency,and ensure aggregate quality.The impact crusher is often used as the last step of the aggregate crushing process,and the crushed products produced by it will be directly used in engineering construction.Therefore,in order to better improve the aggregate crushing quality of the impact crusher,this article relies on the Yunnan Provincial Communications Department.Scientific and technological projects,to carry out the impact analysis of the impact crusher and the impact on the shape of aggregate particles,and complete the following tasks:（1）Through theoretical analysis of crushing mechanism and crushing strength,select theories and criteria suitable for rock crushing analysis and research;based on Hertz theory,complete the counterattack speed,time and mechanical analysis of rock crushing movement;based on overall balance theory Establish a relationship model that affects the shape of crushed particles,determine that the main factors affecting the shape of crushed particles are rock characteristics,crusher structure parameters,and working parameters,and propose an index for evaluating the shape and quality of simulated particles—particle shape quality index.（2）Through the structural analysis of the impact crusher,the selection of the crusher and the determination of the structural parameters are completed,and the creation of the three-dimensional model of the crushing chamber of the impact crusher is completed through CATIA;the API is completed by obtaining the coordinates of the small particles The production of the plug-in finally created rock particles suitable for simulating rock crushing;and then completed the establishment of the discrete element model of the crushing process of the impact crusher.（3）Based on the discrete element model of the crushing chamber of the impact crusher,a single factor research method is selected to discuss the impact of rock characteristics,crusher structure parameters,and working parameters on the crushing action and crushing effect;the research found that:as the strength of the rock increases,The particle shape of the crushed product becomes worse;with the increase of the rotation speed and the inclination of the guide plate,the particle shape of the crushed product becomes better;with the increase of the angle of the first counterattack plate,the particle shape quality of the crushed product shows a trend of first increasing and then decreasing;With the increase of the angle of the second counterattack plate,the grain shape quality of the crushed product shows a tendency to decrease first and then gradually increase.Based on the orthogonal experiment method,the L₉（3⁴）orthogonal simulation scheme with the particle shape quality index as the evaluation index was built,and the main factor affecting the particle shape quality was the rotor speed;the sensitivity relationship was:speed>first Counterattack angle>guide plate inclination angle>second counterattack angle;the best combination of parameters is that the guide plate angle is 54°,the first counterattack angle is 15°,the second counterattack angle is 66°,and the speed is 700r/min,basically consistent with the actual working conditions.（4）Use a high-definition camera to complete the image acquisition of aggregate particles,and use MATLAB to use image processing technology to perform binarization,high-pass filtering,watershed segmentation,morphological processing,convex hull reconstruction,and external fitting ellipse processing on the aggregate particles with the help of MATLAB.Extract the particle shape feature data;based on the particle shape feature evaluation index,complete the analysis of the shape and quality of the broken particles of different types of rocks in the engineering measurement.It is concluded that when the strength is lower,the rock will be more finely broken,and the particle shape quality is relatively better The conclusion further verifies the accuracy of the simulation results.