YU Cheng^a, CAI Gaipin^a,b, HAO Shuhao^a, ZHAO Xin^a, LUO Xiaoyan^a,b

(a. School of Mechanical and Electrical Engineering; b. Jiangxi Province Engineering Research Center for Mechanical and Electrical of Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China)

Abstract: Taking the wolframite ore as the research object, the ultrasonic vibration loading test was carried out. The particle size distribution curve of the crushed ore was obtained through screening test. The fractal dimension of the particle was calculated and the ore crushing process was quantitatively described by using the fractal dimension. The relationship between the fractal dimension and static load, ultrasonic output power and the average particle size were analyzed. The results show that when the static load increase from 100 N to 500 N, the average particle size decrease from 19.513 2 mm to 5.040 0 mm, and the fractal dimension increase from 1.725 2 to 2.541 9. When the ultrasonic output power increase from 1.56 kW to 2.60 kW, the average particle size decrease from 19.672 9 mm to 5.040 0 mm, and the fractal dimension increase from 1.912 7 to 2.541 9. Fractal dimension has a good linear correlation with static load, ultrasonic output power and average particle size respectively， and can intuitively and quantitatively describe the ore crushing process.

Keywords: ultrasonic vibration loading test; screening experiment; particle size distribution; fractal dimension; ore crushing process; fractal characteristics of particles.

Received： 2022-05-19，Revised：2022-10-31，Online：2022-11-18 16:08。

Funding Project：江西省重点研发计划项目，编号：20181ACE50034；江西省教育厅科学技术项目，编号：GJJ200827。

First Author：余成(1998—)，男，硕士研究生，研究方向为智能矿山装备技术及物料破碎动力学。E-mail： 1256201920@qq.com。

Corresponding Author：蔡改贫(1964—)，男，教授，博士，博士生、 硕士生导师，研究方向为智能矿山装备技术、智能监控与工业机器人、物料破碎动力学等。E-mail： 1123615286@qq.com。