CAJ | 학술논문

沥青混合料搅拌设备振动筛的筛分效率决定了混合料生产级配的稳定性，堵筛会使筛分效率发生变化。为了研究堵筛问题，通过对振动筛的结构、工作机理和运动特性分析，建立了振动筛的运动学模型，确定了振动参数与偏心块质量、振动筛质量、当量转动半径等参数之间关系；通过对堵筛条件下颗粒的运动特性和动力学分析，分别建立了刚性筛网和弹性筛网的力学模型，分析了振动筛的动力学参数、材料的物理特性、筛孔尺寸和筛网刚度等参数对堵筛的影响。实验结果表明，对5 mm×5 mm的刚性筛网方孔筛，在常规设计的振动筛频率16 Hz和振幅5 mm下堵筛率较大(大于10%)，堵筛颗粒的逃逸能力较低。因此，当筛孔尺寸小于6 mm时，需要提高振动强度改善堵筛率；为了避免提高振动参数增加技术难度或影响设备结构强度，采用刚度小的弹性筛网是最佳解决方案。
력청혼합료교반설비진동사적사분효솔결정료혼합료생산급배적은정성，도사회사사분효솔발생변화。위료연구도사문제，통과대진동사적결구、공작궤리화운동특성분석，건립료진동사적운동학모형，학정료진동삼수여편심괴질량、진동사질량、당량전동반경등삼수지간관계；통과대도사조건하과립적운동특성화동역학분석，분별건립료강성사망화탄성사망적역학모형，분석료진동사적동역학삼수、재료적물리특성、사공척촌화사망강도등삼수대도사적영향。실험결과표명，대5 mm×5 mm적강성사망방공사，재상규설계적진동사빈솔16 Hz화진폭5 mm하도사솔교대(대우10%)，도사과립적도일능력교저。인차，당사공척촌소우6 mm시，수요제고진동강도개선도사솔；위료피면제고진동삼수증가기술난도혹영향설비결구강도，채용강도소적탄성사망시최가해결방안。
The stability of production gradation of mixture is determined by the screening efficiency of vibrating screen of asphalt mixing plant, and the blocking sieve may result in the change of effi-ciency. To study the problem of blocking sieve, a kinematics model of vibrating screen is established and the relationships of vibration parameters, the qualities of eccentric block and vibrating screen, and equivalent rotation radius are determined by analyzing the structure, working mechanism and motion characteristics of vibrating screen;mechanical models of rigid sieve and elastic sieve are es-tablished respectively and the influence of parameters of vibrating screen, such as kinetic parame-ters, physical properties of the material, the size of vibration sieve mesh and mesh stiffness, on blocking screen is explored by analyzing the motion characteristics and dynamics of particles under the condition of blocking screen. The result shows that the blocking rate of 5 mmí5 mm rigid square-hole vibration screen is larger ( more than 10%) , and the escape ability of particles is rela-tively lower under the conventional design of frequency ( 16 Hz ) and amplitude ( 5 mm ) . There-fore, it is necessary to raise the vibration strength and to reduce the blocking rate when the mesh size is less than 6 mm;the elastic sieve of a smaller stiffness is the best solution to avoid increasing tech-nical difficulties or affecting the structure strength of equipment as a result of the increased vibration parameters.