Research On Working Mechanism And Working Performance Optimization Of Compressive Crusher

Compressive crusher is the main equipment of rock material crushing and it is widely used in metallurgy and mining industry, building industry, road construction, chemical engineering and silicate industry. However, domestic compressive crusher is designing conservatively, manipulating inconveniently and heavy, low efficiency, power wasting and poor product quality.Since middle and post 20th centuries,the crusher working mechanism and working performance has been deeply studied, and the modern high energy compressive crusher holding interparticle breakage chamber, high rotational speed and rational stroke was researched and designed by foreign crusher manufacturers. Those modern crushers has realized many advanced functions including long distance automotive monitor, clearing chamber and protect of over loading, and so on. Therefore, the working performance and product quality of compressive crusher were greatly improved, which increased the economy benefits of crusher manufacturer and the related users.Yet, domestic compressive crushers have not been developed since they were imitated successfully, and those technology levels basically rested on the first and second generation of foreign advanced product. Thereby, in order to improve the working performance of domestic compressive crusher and manufacturing technology level of domestic manufacturing industry, this paper was based on interparticle breakage and the modern optimization technology was adopted, the working mechanism and working performance of compressive crusher were deeply studied, and multi-objective planning of productivity, size reduction and chamber was built up, which provide the basis for developing compressive crusher of new style, high efficiency, energy saving, environment protection and independent knowledge property right.Encircling how to realize these aims, under the support of Shanghai Science and Technology Commission and domestic certain large-scale crusher manufacturer'key research projects, the research task was orientated to"the working mechanism and working performance research on compressive crusher". The full text was expanded from various points of view of crusher working mechanism and working performance, and several breakthroughs were achieved, including crushing mechanism, compressive crusher productivity model, chamber geometry design methodology model, crushing product grain size distribution model and multi-objective model and so on.This paper mainly included these research contents and conclusions as follows:(1) Summarizing the interparticle breakage theory and the related achievements of domestic and foreign countries, discussing the advantages, basic premises and feasibilities of applying interparticle breakage in compressive crushers, the key technology of applying interparticle breakage in compressive crushers was summed up.(2) Based on kinematic and dynamic characters of crusher and rock material, the motion track model of rock material in chamber was built up, and the crushing zones'characters were also studied, which provided the basis for designing and researching the chamber by the method of crushing zones.The motive characters of compressive crushers and rock material in the chamber were deeply studied and the influences between motive states of crusher and rock material and crusher working performance also were discussed. Based on motive character of crusher and rock material, the productivity model of compressive crusher was achieved. Beside, the key structure and working parameters of crusher also deeply researched, and the relationship model between productivity and various key factors was built up. The improved domestic PYB900 cone crusher was considered as research object, the productivity of crusher was studied, and the key structure and working parameters (main shaft rotational speed, cone diameter, base angle of cone, eccentricity, stroke, Close Sided Setting and the length of parallel strip) affecting crusher performance were quantitatively and qualitatively researched, which verified the reliability and feasibility of productivity calculation model.(3) Using the RMT-150B rock mechanic test system to study the interparticle breakage of chamber geometry in compressive crushers, those test data were regressed, and the Selection function and Breakage function were got, which provided the basis for calculate and simulate the size reduction of compressive crushers.Based on advanced breakage theory—interparticle breakage, population balance model and crushing zones'characters, the interparticle breakage process of rock material in chamber of compressive crusher was deeply studied. Combined with the matrix model of rock material breakage, the operating model of rock material interparticle breakage process in chamber of compressive crusher was built up, which opened out the essential causes of interparticle breakage of compressive crushers and also provided the basis for simulating and optimizing product grain size distribution.The improved domestic PYB900 cone crusher was regarded as research object, the crushing product grain size distribution was deeply studied, and the relationship model between product grain size distribution and the key working and structure parameters was accomplished, and the key factors were also quantitatively and qualitatively studied.(4) Based on the characters of crushing zones, combined with the working character of compressive chamber, the fixed mass theory was put forward, and it was used to study the curved chamber geometry of compressive crushers, and the stroking and awaiting characters of compressive crusher lessened or got rid of. Moreover, the concept of working nip angle was introduced into chamber geometry research, which guaranteed the nipping requirement and improved the machine's working performance.Based on interparticle breakage, crushing zones'characters, the fixed mass theory and working nip angle demand, the interparticle curved chamber geometry was built up and the new method of interpartcle curved chamber geometry was put forward.(5) Based on working mechanism and working performance research of compressive crusher, the multi-objective planning of crusher productivity, product grain size distribution and chamber geometry was built up, which provided the basis for developing new style and high efficiency modern compressive crusher.Combined with multi-objective planning of cone crusher, the solving methodology of multi-objective planning of compressive crusher was deeply studied, and the serial quadratic programming based on K-T equation was adopted to solve this multi-objective problem. Besides, the AUTOFINE36 cone crusher was considered as research object, the multi-objective planning was used to optimize this kind of cone crusher, which verified the feasibility and reliability of those models.(6) Based on compressive crusher working performance models and multi-planning model, the cone crusher optimization system was developed. This system could optimize and analyze the working performance and design parameters of cone crusher. The serial domestic cone crusher PYB900, PYB1200, PYB1750 and PYB2200 was used to as research examples, the related multi-objective planning of those cone crushers were researched. Besides, the multi-design programs of domestic PYB900 cone crusher were optimized, which further verified the feasibility and reliability of working performance models and multi-objective planning models.Based on multi-objective planning results, the domestic PYB900 cone crusher was improved, cooperating with crusher manufacturer, a physical prototype was manufactured. Through the related physical prototype full scale test further verified the feasibility and reliability of working performance models and multi-objective models.Based on working mechanism and working performance research, the parameters'optimization system was developed and successfully applied in the related crusher manufacturer. This optimization system has got many compliments for its good effect.(7) The future research works, including research aims, contents, and methods, are put forward to outlook.