Movement Characteristics of Ore-Rock in Inclined Orepass and its Influencing Factors
The orepass is an important project for ore-rock transportation.The damage of the sidewall caused by the unloading impact is the main problem that restricts the age limit of the orepass.In order to analyze the movement process of ore-rock in inclined orepass,PFC numerical simulation experiment and physical similarity experiment were used to simulate the unloading process of inclined orepass,analyze the movement form and velocity variation characteristics of ore-rock in inclined orepass,study the influence of inclined angle of orepass on the movement law of ore-rock and the position of impact sidewall,and discuss the difference of movement mode of ore-rock in vertical orepass and inclined orepass.The study findings are as follows.Firstly,when the inclined angle of orepass is 60°,the two impact heights of the ore-rock are 1.36 m and 3.30 m away from the unloading port,the impact velocity is 9.53 m/s and 5.47 m/s,respectively,and the peak speed of the ore-rock reaches 16.17 m/s when it reaches the orepass floor.The process of ore-rock movement can be simplified into five stages:uniform accelerated sliding or rolling in the branch orepass,oblique throwing movement at a certain initial speed away from the orepass,two impacts with the sidewall,uniform accelerated sliding or rolling movement along the sidewall,and finally reaching the bottom of the orepass.Secondly,the influence of the inclined angle of the orepass on the movement process of the ore-rock is very significant.As the inclined angle of orepass increases,the distance between the two impact positions of the ore-rock and the height of the unloading port increases.After the inclined angle exceeds 60°,the distance between the position of the second impact and the height of the unloading port and the impact velocity increase sharply.Thirdly,compared with the vertical orepass,the movement process of the ore-rock in the inclined orepass is more significantly restricted by the boundary of the sidewall,and the falling body movement time is shorter.There is a relatively long-distance contact and sliding process between the ore-rock and the sidewall,which causes friction damage to the sidewall.
Inclined orepassMovement characteristics of ore-rockThe inclined angle of orepassNumerical simulation
万方数据
维普
