ZHANG Peng, MA Haozhou, LI Bo, DONG Yingwei, WANG Xuewen

(College of Mechanical and Transportation Engineering, Shanxi Provincial Key Laboratory of Coal Mining Equipment,Taiyuan University of Technology, Taiyuan 030024, Chaina)

Abstract

Objective Considering that the working environment of the scraper conveyor is relatively harsh, it is difficult for researchers to carry out tests related to the underground scraper conveyor, and the laboratory is unable to reproduce the relevant working conditions due to objective limitations. Compared with real tests, simulation tests have the advantages of low cost, high safety, and controllable test conditions. However, the main difficulty of simulation tests is to verify the accuracy of the simulation model, which directly affects the reliability of the simulation results. Based on the 1∶ 3 test platform of the scraper conveyor, the real test results and simulation results can be verified and analyzed. This research methods and results would be helpful for the development of scraper conveyors in the direction of intelligence.

Methods The reliability of the scraper conveyor simulation model was verified from the experimental and theoretical perspectives by using a 1∶ 3 scraper conveyor test platform under the same working conditions. Therefore, the method of simulation test was used to simulate the complex underground working conditions. Moreover, different working inclination angles and striking inclination angles were set in the simulation to analyze the influence of different terrain conditions on the transportation efficiency and chain tension of the scraper conveyor. Finally, the fatigue life change trend of the chain ring was studied by using finite element simulation.

Results and Discussion The results show that the accuracy of the parameters such as scraper chain speed, sprocket torque and scraper conveyor running resistance are above 80% after the experimental and theoretical verification. It is proved that the coupled model simulation for the process of transporting coal bulk material using a scraper conveyor and similar theory have certain reliability. In this paper, the impact of varying working inclination angles ranging from 14° to -21°on the transport efficiency of a scraper conveyor is investigated. When the working inclination angle changes from 14° to - 21°, the transport efficiency of scraper conveyor gradually increases until reaching saturation, with a peak efficiency of 436. 6 kg / s observed at the working inclination angle of -21°. Similarly, when the strike inclination angle changes from -10° to 5°, the transport efficiency follows a similar trend and achieves a maximum efficiency of 360. 7 kg / s at the strike inclination angle of 5°. In this paper, the chain tension of scraper conveyor shows the trend of increasing uphill and decreasing downhill under different working inclination angles. When the strike inclination angle changes from -10° to 10°, the chain 2 tension initially increases and then decreases, while the chain 1 tension keeps increasing. Under normal working condition, the fatigue life of the chain ring is determined to be 32. 64 days.Furthermore, as the working inclination angle varies from 14° to -21°, the fatigue life of the chain ring shows an exponential upward trend. Similarly, when adjusting the strike inclination angle from -10° to 10°, the fatigue life of the chain ring in Chain 1 experiences an exponential decline, while the fatigue life of the chain ring in Chain 2 undergoes a downward and subsequently upward trend.

Conclusion In this paper, the simulation test can effectively solve the problem that it is difficult to carry out the test related to the scraper conveyor. Using the verified simulation model of scraper conveyor, it can accurately simulate the complex underground working conditions of the scraper conveyor, and quantitatively analyze the interaction between coal materials and scraper conveyor under different working conditions. This can provide certain reference for the development of scraper conveyor in the direction of intelligence.

Keywords: scraper conveyor; transportation efficiency; chain tension; fatigue life

Get Citation:ZHANG P, MA H Z, LI B, et al. Transportation efficiency and chain ring fatigue life of scraper conveyor under different terrain conditions[J]. China Powder Science and Technology, 2024, 30(2): 45-59.

Received: 2023-10-25,Revised:2023-11-30,Online:2024-01-18。

Funding Project:国家自然科学基金项目,编号:51875386,52204149,51804207;山西省基础研究计划项目,编号:02103021223080,202203021221051。

First Author:张鹏(1998—),男,硕士研究生,研究方向为现代设计理论与方法。 E-mail: 1714166989@qq.com。

Corresponding Author:王学文(1979—),男,教授,博士,山西省高等学校优秀青年学术带头人,山西省高等学校“131”领军人才-优秀中青年拔尖创新人才,博士生导师,研究方向为机械设计及理论。 E-mail: wxuew@163.com。

DOI:10.13732 / j.issn.1008-5548.2024.02.006

CLC No: TD528; TH227; TB44                 Type Code:A

Serial No:1008-5548(2024)02-0045-15